ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #include "accessors.h" |
| 31 | #include "api.h" |
| 32 | #include "bootstrapper.h" |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 33 | #include "codegen.h" |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 34 | #include "compilation-cache.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 35 | #include "debug.h" |
ricow@chromium.org | 4f693d6 | 2011-07-04 14:01:31 +0000 | [diff] [blame] | 36 | #include "deoptimizer.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 37 | #include "global-handles.h" |
fschneider@chromium.org | fb144a0 | 2011-05-04 12:43:48 +0000 | [diff] [blame] | 38 | #include "heap-profiler.h" |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 39 | #include "incremental-marking.h" |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 40 | #include "liveobjectlist-inl.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 41 | #include "mark-compact.h" |
| 42 | #include "natives.h" |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 43 | #include "objects-visiting.h" |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 44 | #include "objects-visiting-inl.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 45 | #include "runtime-profiler.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 46 | #include "scopeinfo.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 47 | #include "snapshot.h" |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 48 | #include "store-buffer.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 49 | #include "v8threads.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 50 | #include "vm-state-inl.h" |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 51 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 52 | #include "regexp-macro-assembler.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 53 | #include "arm/regexp-macro-assembler-arm.h" |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 54 | #endif |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 55 | #if V8_TARGET_ARCH_MIPS && !V8_INTERPRETED_REGEXP |
| 56 | #include "regexp-macro-assembler.h" |
| 57 | #include "mips/regexp-macro-assembler-mips.h" |
| 58 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 59 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 60 | namespace v8 { |
| 61 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 62 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 63 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 64 | static Mutex* gc_initializer_mutex = OS::CreateMutex(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 65 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 66 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 67 | Heap::Heap() |
| 68 | : isolate_(NULL), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 69 | // semispace_size_ should be a power of 2 and old_generation_size_ should be |
| 70 | // a multiple of Page::kPageSize. |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 71 | #if defined(ANDROID) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 72 | #define LUMP_OF_MEMORY (128 * KB) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 73 | code_range_size_(0), |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 74 | #elif defined(V8_TARGET_ARCH_X64) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 75 | #define LUMP_OF_MEMORY (2 * MB) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 76 | code_range_size_(512*MB), |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 77 | #else |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 78 | #define LUMP_OF_MEMORY MB |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 79 | code_range_size_(0), |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 80 | #endif |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 81 | reserved_semispace_size_(8 * Max(LUMP_OF_MEMORY, Page::kPageSize)), |
| 82 | max_semispace_size_(8 * Max(LUMP_OF_MEMORY, Page::kPageSize)), |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 83 | initial_semispace_size_(Page::kPageSize), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 84 | max_old_generation_size_(700ul * LUMP_OF_MEMORY), |
| 85 | max_executable_size_(128l * LUMP_OF_MEMORY), |
| 86 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 87 | // Variables set based on semispace_size_ and old_generation_size_ in |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 88 | // ConfigureHeap (survived_since_last_expansion_, external_allocation_limit_) |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 89 | // Will be 4 * reserved_semispace_size_ to ensure that young |
| 90 | // generation can be aligned to its size. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 91 | survived_since_last_expansion_(0), |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 92 | sweep_generation_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 93 | always_allocate_scope_depth_(0), |
| 94 | linear_allocation_scope_depth_(0), |
| 95 | contexts_disposed_(0), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 96 | scan_on_scavenge_pages_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 97 | new_space_(this), |
| 98 | old_pointer_space_(NULL), |
| 99 | old_data_space_(NULL), |
| 100 | code_space_(NULL), |
| 101 | map_space_(NULL), |
| 102 | cell_space_(NULL), |
| 103 | lo_space_(NULL), |
| 104 | gc_state_(NOT_IN_GC), |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 105 | gc_post_processing_depth_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 106 | ms_count_(0), |
| 107 | gc_count_(0), |
| 108 | unflattened_strings_length_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 109 | #ifdef DEBUG |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 110 | allocation_allowed_(true), |
| 111 | allocation_timeout_(0), |
| 112 | disallow_allocation_failure_(false), |
| 113 | debug_utils_(NULL), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 114 | #endif // DEBUG |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 115 | new_space_high_promotion_mode_active_(false), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 116 | old_gen_promotion_limit_(kMinimumPromotionLimit), |
| 117 | old_gen_allocation_limit_(kMinimumAllocationLimit), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 118 | old_gen_limit_factor_(1), |
| 119 | size_of_old_gen_at_last_old_space_gc_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 120 | external_allocation_limit_(0), |
| 121 | amount_of_external_allocated_memory_(0), |
| 122 | amount_of_external_allocated_memory_at_last_global_gc_(0), |
| 123 | old_gen_exhausted_(false), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 124 | store_buffer_rebuilder_(store_buffer()), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 125 | hidden_symbol_(NULL), |
| 126 | global_gc_prologue_callback_(NULL), |
| 127 | global_gc_epilogue_callback_(NULL), |
| 128 | gc_safe_size_of_old_object_(NULL), |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 129 | total_regexp_code_generated_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 130 | tracer_(NULL), |
| 131 | young_survivors_after_last_gc_(0), |
| 132 | high_survival_rate_period_length_(0), |
| 133 | survival_rate_(0), |
| 134 | previous_survival_rate_trend_(Heap::STABLE), |
| 135 | survival_rate_trend_(Heap::STABLE), |
| 136 | max_gc_pause_(0), |
| 137 | max_alive_after_gc_(0), |
| 138 | min_in_mutator_(kMaxInt), |
| 139 | alive_after_last_gc_(0), |
| 140 | last_gc_end_timestamp_(0.0), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 141 | store_buffer_(this), |
| 142 | marking_(this), |
| 143 | incremental_marking_(this), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 144 | number_idle_notifications_(0), |
| 145 | last_idle_notification_gc_count_(0), |
| 146 | last_idle_notification_gc_count_init_(false), |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 147 | idle_notification_will_schedule_next_gc_(false), |
| 148 | mark_sweeps_since_idle_round_started_(0), |
| 149 | ms_count_at_last_idle_notification_(0), |
| 150 | gc_count_at_last_idle_gc_(0), |
| 151 | scavenges_since_last_idle_round_(kIdleScavengeThreshold), |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 152 | promotion_queue_(this), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 153 | configured_(false), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 154 | chunks_queued_for_free_(NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 155 | // Allow build-time customization of the max semispace size. Building |
| 156 | // V8 with snapshots and a non-default max semispace size is much |
| 157 | // easier if you can define it as part of the build environment. |
| 158 | #if defined(V8_MAX_SEMISPACE_SIZE) |
| 159 | max_semispace_size_ = reserved_semispace_size_ = V8_MAX_SEMISPACE_SIZE; |
| 160 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 161 | |
lrn@chromium.org | ac2828d | 2011-06-23 06:29:21 +0000 | [diff] [blame] | 162 | intptr_t max_virtual = OS::MaxVirtualMemory(); |
| 163 | |
| 164 | if (max_virtual > 0) { |
| 165 | if (code_range_size_ > 0) { |
| 166 | // Reserve no more than 1/8 of the memory for the code range. |
| 167 | code_range_size_ = Min(code_range_size_, max_virtual >> 3); |
| 168 | } |
| 169 | } |
| 170 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 171 | memset(roots_, 0, sizeof(roots_[0]) * kRootListLength); |
| 172 | global_contexts_list_ = NULL; |
| 173 | mark_compact_collector_.heap_ = this; |
| 174 | external_string_table_.heap_ = this; |
| 175 | } |
| 176 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 177 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 178 | intptr_t Heap::Capacity() { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 179 | if (!HasBeenSetUp()) return 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 180 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 181 | return new_space_.Capacity() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 182 | old_pointer_space_->Capacity() + |
| 183 | old_data_space_->Capacity() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 184 | code_space_->Capacity() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 185 | map_space_->Capacity() + |
| 186 | cell_space_->Capacity(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 190 | intptr_t Heap::CommittedMemory() { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 191 | if (!HasBeenSetUp()) return 0; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 192 | |
| 193 | return new_space_.CommittedMemory() + |
| 194 | old_pointer_space_->CommittedMemory() + |
| 195 | old_data_space_->CommittedMemory() + |
| 196 | code_space_->CommittedMemory() + |
| 197 | map_space_->CommittedMemory() + |
| 198 | cell_space_->CommittedMemory() + |
| 199 | lo_space_->Size(); |
| 200 | } |
| 201 | |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 202 | intptr_t Heap::CommittedMemoryExecutable() { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 203 | if (!HasBeenSetUp()) return 0; |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 204 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 205 | return isolate()->memory_allocator()->SizeExecutable(); |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 206 | } |
| 207 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 208 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 209 | intptr_t Heap::Available() { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 210 | if (!HasBeenSetUp()) return 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 211 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 212 | return new_space_.Available() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 213 | old_pointer_space_->Available() + |
| 214 | old_data_space_->Available() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 215 | code_space_->Available() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 216 | map_space_->Available() + |
| 217 | cell_space_->Available(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 221 | bool Heap::HasBeenSetUp() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 222 | return old_pointer_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 223 | old_data_space_ != NULL && |
| 224 | code_space_ != NULL && |
| 225 | map_space_ != NULL && |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 226 | cell_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 227 | lo_space_ != NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 228 | } |
| 229 | |
| 230 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 231 | int Heap::GcSafeSizeOfOldObject(HeapObject* object) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 232 | if (IntrusiveMarking::IsMarked(object)) { |
| 233 | return IntrusiveMarking::SizeOfMarkedObject(object); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 234 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 235 | return object->SizeFromMap(object->map()); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 239 | GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space) { |
| 240 | // Is global GC requested? |
| 241 | if (space != NEW_SPACE || FLAG_gc_global) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 242 | isolate_->counters()->gc_compactor_caused_by_request()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 243 | return MARK_COMPACTOR; |
| 244 | } |
| 245 | |
| 246 | // Is enough data promoted to justify a global GC? |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 247 | if (OldGenerationPromotionLimitReached()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 248 | isolate_->counters()->gc_compactor_caused_by_promoted_data()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 249 | return MARK_COMPACTOR; |
| 250 | } |
| 251 | |
| 252 | // Have allocation in OLD and LO failed? |
| 253 | if (old_gen_exhausted_) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 254 | isolate_->counters()-> |
| 255 | gc_compactor_caused_by_oldspace_exhaustion()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 256 | return MARK_COMPACTOR; |
| 257 | } |
| 258 | |
| 259 | // Is there enough space left in OLD to guarantee that a scavenge can |
| 260 | // succeed? |
| 261 | // |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 262 | // Note that MemoryAllocator->MaxAvailable() undercounts the memory available |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 263 | // for object promotion. It counts only the bytes that the memory |
| 264 | // allocator has not yet allocated from the OS and assigned to any space, |
| 265 | // and does not count available bytes already in the old space or code |
| 266 | // space. Undercounting is safe---we may get an unrequested full GC when |
| 267 | // a scavenge would have succeeded. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 268 | if (isolate_->memory_allocator()->MaxAvailable() <= new_space_.Size()) { |
| 269 | isolate_->counters()-> |
| 270 | gc_compactor_caused_by_oldspace_exhaustion()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 271 | return MARK_COMPACTOR; |
| 272 | } |
| 273 | |
| 274 | // Default |
| 275 | return SCAVENGER; |
| 276 | } |
| 277 | |
| 278 | |
| 279 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 280 | // --log-gc to avoid the complicated preprocessor and flag testing. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 281 | void Heap::ReportStatisticsBeforeGC() { |
| 282 | // Heap::ReportHeapStatistics will also log NewSpace statistics when |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 283 | // compiled --log-gc is set. The following logic is used to avoid |
| 284 | // double logging. |
| 285 | #ifdef DEBUG |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 286 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 287 | if (FLAG_heap_stats) { |
| 288 | ReportHeapStatistics("Before GC"); |
| 289 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 290 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 291 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 292 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.ClearHistograms(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 293 | #else |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 294 | if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 295 | new_space_.CollectStatistics(); |
| 296 | new_space_.ReportStatistics(); |
| 297 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 298 | } |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 299 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 303 | void Heap::PrintShortHeapStatistics() { |
| 304 | if (!FLAG_trace_gc_verbose) return; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 305 | PrintF("Memory allocator, used: %8" V8_PTR_PREFIX "d" |
| 306 | ", available: %8" V8_PTR_PREFIX "d\n", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 307 | isolate_->memory_allocator()->Size(), |
| 308 | isolate_->memory_allocator()->Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 309 | PrintF("New space, used: %8" V8_PTR_PREFIX "d" |
| 310 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 311 | Heap::new_space_.Size(), |
| 312 | new_space_.Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 313 | PrintF("Old pointers, used: %8" V8_PTR_PREFIX "d" |
| 314 | ", available: %8" V8_PTR_PREFIX "d" |
| 315 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 316 | old_pointer_space_->Size(), |
| 317 | old_pointer_space_->Available(), |
| 318 | old_pointer_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 319 | PrintF("Old data space, used: %8" V8_PTR_PREFIX "d" |
| 320 | ", available: %8" V8_PTR_PREFIX "d" |
| 321 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 322 | old_data_space_->Size(), |
| 323 | old_data_space_->Available(), |
| 324 | old_data_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 325 | PrintF("Code space, used: %8" V8_PTR_PREFIX "d" |
| 326 | ", available: %8" V8_PTR_PREFIX "d" |
| 327 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 328 | code_space_->Size(), |
| 329 | code_space_->Available(), |
| 330 | code_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 331 | PrintF("Map space, used: %8" V8_PTR_PREFIX "d" |
| 332 | ", available: %8" V8_PTR_PREFIX "d" |
| 333 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 334 | map_space_->Size(), |
| 335 | map_space_->Available(), |
| 336 | map_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 337 | PrintF("Cell space, used: %8" V8_PTR_PREFIX "d" |
| 338 | ", available: %8" V8_PTR_PREFIX "d" |
| 339 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 340 | cell_space_->Size(), |
| 341 | cell_space_->Available(), |
| 342 | cell_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 343 | PrintF("Large object space, used: %8" V8_PTR_PREFIX "d" |
| 344 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 345 | lo_space_->Size(), |
| 346 | lo_space_->Available()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 347 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 348 | |
| 349 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 350 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 351 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 352 | void Heap::ReportStatisticsAfterGC() { |
| 353 | // Similar to the before GC, we use some complicated logic to ensure that |
| 354 | // NewSpace statistics are logged exactly once when --log-gc is turned on. |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 355 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 356 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 357 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 358 | ReportHeapStatistics("After GC"); |
| 359 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 360 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 361 | } |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 362 | #else |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 363 | if (FLAG_log_gc) new_space_.ReportStatistics(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 364 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 365 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 366 | |
| 367 | |
| 368 | void Heap::GarbageCollectionPrologue() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 369 | isolate_->transcendental_cache()->Clear(); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 370 | ClearJSFunctionResultCaches(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 371 | gc_count_++; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 372 | unflattened_strings_length_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 373 | #ifdef DEBUG |
| 374 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 375 | allow_allocation(false); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 376 | |
| 377 | if (FLAG_verify_heap) { |
| 378 | Verify(); |
| 379 | } |
| 380 | |
| 381 | if (FLAG_gc_verbose) Print(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 382 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 383 | |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 384 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 385 | ReportStatisticsBeforeGC(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 386 | #endif // DEBUG |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 387 | |
| 388 | LiveObjectList::GCPrologue(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 389 | store_buffer()->GCPrologue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 390 | } |
| 391 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 392 | intptr_t Heap::SizeOfObjects() { |
| 393 | intptr_t total = 0; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 394 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 395 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 396 | total += space->SizeOfObjects(); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 397 | } |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 398 | return total; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | void Heap::GarbageCollectionEpilogue() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 402 | store_buffer()->GCEpilogue(); |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 403 | LiveObjectList::GCEpilogue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 404 | #ifdef DEBUG |
| 405 | allow_allocation(true); |
| 406 | ZapFromSpace(); |
| 407 | |
| 408 | if (FLAG_verify_heap) { |
| 409 | Verify(); |
| 410 | } |
| 411 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 412 | if (FLAG_print_global_handles) isolate_->global_handles()->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 413 | if (FLAG_print_handles) PrintHandles(); |
| 414 | if (FLAG_gc_verbose) Print(); |
| 415 | if (FLAG_code_stats) ReportCodeStatistics("After GC"); |
| 416 | #endif |
| 417 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 418 | isolate_->counters()->alive_after_last_gc()->Set( |
| 419 | static_cast<int>(SizeOfObjects())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 420 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 421 | isolate_->counters()->symbol_table_capacity()->Set( |
| 422 | symbol_table()->Capacity()); |
| 423 | isolate_->counters()->number_of_symbols()->Set( |
| 424 | symbol_table()->NumberOfElements()); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 425 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 426 | ReportStatisticsAfterGC(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 427 | #endif // DEBUG |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 428 | #ifdef ENABLE_DEBUGGER_SUPPORT |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 429 | isolate_->debug()->AfterGarbageCollection(); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 430 | #endif // ENABLE_DEBUGGER_SUPPORT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 434 | void Heap::CollectAllGarbage(int flags) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 435 | // Since we are ignoring the return value, the exact choice of space does |
| 436 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 437 | // cause a full GC. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 438 | mark_compact_collector_.SetFlags(flags); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 439 | CollectGarbage(OLD_POINTER_SPACE); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 440 | mark_compact_collector_.SetFlags(kNoGCFlags); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 444 | void Heap::CollectAllAvailableGarbage() { |
| 445 | // Since we are ignoring the return value, the exact choice of space does |
| 446 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 447 | // cause a full GC. |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 448 | // Major GC would invoke weak handle callbacks on weakly reachable |
| 449 | // handles, but won't collect weakly reachable objects until next |
| 450 | // major GC. Therefore if we collect aggressively and weak handle callback |
| 451 | // has been invoked, we rerun major GC to release objects which become |
| 452 | // garbage. |
| 453 | // Note: as weak callbacks can execute arbitrary code, we cannot |
| 454 | // hope that eventually there will be no weak callbacks invocations. |
| 455 | // Therefore stop recollecting after several attempts. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 456 | mark_compact_collector()->SetFlags(kMakeHeapIterableMask); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 457 | isolate_->compilation_cache()->Clear(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 458 | const int kMaxNumberOfAttempts = 7; |
| 459 | for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) { |
| 460 | if (!CollectGarbage(OLD_POINTER_SPACE, MARK_COMPACTOR)) { |
| 461 | break; |
| 462 | } |
| 463 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 464 | mark_compact_collector()->SetFlags(kNoGCFlags); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 465 | new_space_.Shrink(); |
danno@chromium.org | bf0c820 | 2011-12-27 10:09:42 +0000 | [diff] [blame] | 466 | UncommitFromSpace(); |
| 467 | Shrink(); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 468 | incremental_marking()->UncommitMarkingDeque(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | |
| 472 | bool Heap::CollectGarbage(AllocationSpace space, GarbageCollector collector) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 473 | // The VM is in the GC state until exiting this function. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 474 | VMState state(isolate_, GC); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 475 | |
| 476 | #ifdef DEBUG |
| 477 | // Reset the allocation timeout to the GC interval, but make sure to |
| 478 | // allow at least a few allocations after a collection. The reason |
| 479 | // for this is that we have a lot of allocation sequences and we |
| 480 | // assume that a garbage collection will allow the subsequent |
| 481 | // allocation attempts to go through. |
| 482 | allocation_timeout_ = Max(6, FLAG_gc_interval); |
| 483 | #endif |
| 484 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 485 | if (collector == SCAVENGER && !incremental_marking()->IsStopped()) { |
| 486 | if (FLAG_trace_incremental_marking) { |
| 487 | PrintF("[IncrementalMarking] Scavenge during marking.\n"); |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | if (collector == MARK_COMPACTOR && |
| 492 | !mark_compact_collector()->PreciseSweepingRequired() && |
| 493 | !incremental_marking()->IsStopped() && |
| 494 | !incremental_marking()->should_hurry() && |
| 495 | FLAG_incremental_marking_steps) { |
| 496 | if (FLAG_trace_incremental_marking) { |
| 497 | PrintF("[IncrementalMarking] Delaying MarkSweep.\n"); |
| 498 | } |
| 499 | collector = SCAVENGER; |
| 500 | } |
| 501 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 502 | bool next_gc_likely_to_collect_more = false; |
| 503 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 504 | { GCTracer tracer(this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 505 | GarbageCollectionPrologue(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 506 | // The GC count was incremented in the prologue. Tell the tracer about |
| 507 | // it. |
| 508 | tracer.set_gc_count(gc_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 509 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 510 | // Tell the tracer which collector we've selected. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 511 | tracer.set_collector(collector); |
| 512 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 513 | HistogramTimer* rate = (collector == SCAVENGER) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 514 | ? isolate_->counters()->gc_scavenger() |
| 515 | : isolate_->counters()->gc_compactor(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 516 | rate->Start(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 517 | next_gc_likely_to_collect_more = |
| 518 | PerformGarbageCollection(collector, &tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 519 | rate->Stop(); |
| 520 | |
| 521 | GarbageCollectionEpilogue(); |
| 522 | } |
| 523 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 524 | ASSERT(collector == SCAVENGER || incremental_marking()->IsStopped()); |
| 525 | if (incremental_marking()->IsStopped()) { |
| 526 | if (incremental_marking()->WorthActivating() && NextGCIsLikelyToBeFull()) { |
| 527 | incremental_marking()->Start(); |
| 528 | } |
| 529 | } |
| 530 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 531 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 535 | void Heap::PerformScavenge() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 536 | GCTracer tracer(this); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 537 | if (incremental_marking()->IsStopped()) { |
| 538 | PerformGarbageCollection(SCAVENGER, &tracer); |
| 539 | } else { |
| 540 | PerformGarbageCollection(MARK_COMPACTOR, &tracer); |
| 541 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 545 | #ifdef DEBUG |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 546 | // Helper class for verifying the symbol table. |
| 547 | class SymbolTableVerifier : public ObjectVisitor { |
| 548 | public: |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 549 | void VisitPointers(Object** start, Object** end) { |
| 550 | // Visit all HeapObject pointers in [start, end). |
| 551 | for (Object** p = start; p < end; p++) { |
| 552 | if ((*p)->IsHeapObject()) { |
| 553 | // Check that the symbol is actually a symbol. |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 554 | ASSERT((*p)->IsTheHole() || (*p)->IsUndefined() || (*p)->IsSymbol()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 555 | } |
| 556 | } |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 557 | } |
| 558 | }; |
| 559 | #endif // DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 560 | |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 561 | |
| 562 | static void VerifySymbolTable() { |
| 563 | #ifdef DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 564 | SymbolTableVerifier verifier; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 565 | HEAP->symbol_table()->IterateElements(&verifier); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 566 | #endif // DEBUG |
| 567 | } |
| 568 | |
| 569 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 570 | void Heap::ReserveSpace( |
| 571 | int new_space_size, |
| 572 | int pointer_space_size, |
| 573 | int data_space_size, |
| 574 | int code_space_size, |
| 575 | int map_space_size, |
| 576 | int cell_space_size, |
| 577 | int large_object_size) { |
| 578 | NewSpace* new_space = Heap::new_space(); |
| 579 | PagedSpace* old_pointer_space = Heap::old_pointer_space(); |
| 580 | PagedSpace* old_data_space = Heap::old_data_space(); |
| 581 | PagedSpace* code_space = Heap::code_space(); |
| 582 | PagedSpace* map_space = Heap::map_space(); |
| 583 | PagedSpace* cell_space = Heap::cell_space(); |
| 584 | LargeObjectSpace* lo_space = Heap::lo_space(); |
| 585 | bool gc_performed = true; |
| 586 | while (gc_performed) { |
| 587 | gc_performed = false; |
| 588 | if (!new_space->ReserveSpace(new_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 589 | Heap::CollectGarbage(NEW_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 590 | gc_performed = true; |
| 591 | } |
| 592 | if (!old_pointer_space->ReserveSpace(pointer_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 593 | Heap::CollectGarbage(OLD_POINTER_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 594 | gc_performed = true; |
| 595 | } |
| 596 | if (!(old_data_space->ReserveSpace(data_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 597 | Heap::CollectGarbage(OLD_DATA_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 598 | gc_performed = true; |
| 599 | } |
| 600 | if (!(code_space->ReserveSpace(code_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 601 | Heap::CollectGarbage(CODE_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 602 | gc_performed = true; |
| 603 | } |
| 604 | if (!(map_space->ReserveSpace(map_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 605 | Heap::CollectGarbage(MAP_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 606 | gc_performed = true; |
| 607 | } |
| 608 | if (!(cell_space->ReserveSpace(cell_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 609 | Heap::CollectGarbage(CELL_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 610 | gc_performed = true; |
| 611 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 612 | // We add a slack-factor of 2 in order to have space for a series of |
| 613 | // large-object allocations that are only just larger than the page size. |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 614 | large_object_size *= 2; |
| 615 | // The ReserveSpace method on the large object space checks how much |
| 616 | // we can expand the old generation. This includes expansion caused by |
| 617 | // allocation in the other spaces. |
| 618 | large_object_size += cell_space_size + map_space_size + code_space_size + |
| 619 | data_space_size + pointer_space_size; |
| 620 | if (!(lo_space->ReserveSpace(large_object_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 621 | Heap::CollectGarbage(LO_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 622 | gc_performed = true; |
| 623 | } |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 628 | void Heap::EnsureFromSpaceIsCommitted() { |
| 629 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 630 | |
| 631 | // Committing memory to from space failed. |
| 632 | // Try shrinking and try again. |
| 633 | Shrink(); |
| 634 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 635 | |
| 636 | // Committing memory to from space failed again. |
| 637 | // Memory is exhausted and we will die. |
| 638 | V8::FatalProcessOutOfMemory("Committing semi space failed."); |
| 639 | } |
| 640 | |
| 641 | |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 642 | void Heap::ClearJSFunctionResultCaches() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 643 | if (isolate_->bootstrapper()->IsActive()) return; |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 644 | |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 645 | Object* context = global_contexts_list_; |
| 646 | while (!context->IsUndefined()) { |
ricow@chromium.org | 7ad6522 | 2011-12-19 12:13:11 +0000 | [diff] [blame] | 647 | // Get the caches for this context. GC can happen when the context |
| 648 | // is not fully initialized, so the caches can be undefined. |
| 649 | Object* caches_or_undefined = |
| 650 | Context::cast(context)->get(Context::JSFUNCTION_RESULT_CACHES_INDEX); |
| 651 | if (!caches_or_undefined->IsUndefined()) { |
| 652 | FixedArray* caches = FixedArray::cast(caches_or_undefined); |
| 653 | // Clear the caches: |
| 654 | int length = caches->length(); |
| 655 | for (int i = 0; i < length; i++) { |
| 656 | JSFunctionResultCache::cast(caches->get(i))->Clear(); |
| 657 | } |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 658 | } |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 659 | // Get the next context: |
| 660 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 661 | } |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 665 | |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 666 | void Heap::ClearNormalizedMapCaches() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 667 | if (isolate_->bootstrapper()->IsActive() && |
| 668 | !incremental_marking()->IsMarking()) { |
| 669 | return; |
| 670 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 671 | |
| 672 | Object* context = global_contexts_list_; |
| 673 | while (!context->IsUndefined()) { |
ricow@chromium.org | 7ad6522 | 2011-12-19 12:13:11 +0000 | [diff] [blame] | 674 | // GC can happen when the context is not fully initialized, |
| 675 | // so the cache can be undefined. |
| 676 | Object* cache = |
| 677 | Context::cast(context)->get(Context::NORMALIZED_MAP_CACHE_INDEX); |
| 678 | if (!cache->IsUndefined()) { |
| 679 | NormalizedMapCache::cast(cache)->Clear(); |
| 680 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 681 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 682 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 683 | } |
| 684 | |
| 685 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 686 | void Heap::UpdateSurvivalRateTrend(int start_new_space_size) { |
| 687 | double survival_rate = |
| 688 | (static_cast<double>(young_survivors_after_last_gc_) * 100) / |
| 689 | start_new_space_size; |
| 690 | |
| 691 | if (survival_rate > kYoungSurvivalRateThreshold) { |
| 692 | high_survival_rate_period_length_++; |
| 693 | } else { |
| 694 | high_survival_rate_period_length_ = 0; |
| 695 | } |
| 696 | |
| 697 | double survival_rate_diff = survival_rate_ - survival_rate; |
| 698 | |
| 699 | if (survival_rate_diff > kYoungSurvivalRateAllowedDeviation) { |
| 700 | set_survival_rate_trend(DECREASING); |
| 701 | } else if (survival_rate_diff < -kYoungSurvivalRateAllowedDeviation) { |
| 702 | set_survival_rate_trend(INCREASING); |
| 703 | } else { |
| 704 | set_survival_rate_trend(STABLE); |
| 705 | } |
| 706 | |
| 707 | survival_rate_ = survival_rate; |
| 708 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 709 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 710 | bool Heap::PerformGarbageCollection(GarbageCollector collector, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 711 | GCTracer* tracer) { |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 712 | bool next_gc_likely_to_collect_more = false; |
| 713 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 714 | if (collector != SCAVENGER) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 715 | PROFILE(isolate_, CodeMovingGCEvent()); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 716 | } |
| 717 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 718 | if (FLAG_verify_heap) { |
| 719 | VerifySymbolTable(); |
| 720 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 721 | if (collector == MARK_COMPACTOR && global_gc_prologue_callback_) { |
| 722 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 723 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 724 | global_gc_prologue_callback_(); |
| 725 | } |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 726 | |
| 727 | GCType gc_type = |
| 728 | collector == MARK_COMPACTOR ? kGCTypeMarkSweepCompact : kGCTypeScavenge; |
| 729 | |
| 730 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 731 | if (gc_type & gc_prologue_callbacks_[i].gc_type) { |
| 732 | gc_prologue_callbacks_[i].callback(gc_type, kNoGCCallbackFlags); |
| 733 | } |
| 734 | } |
| 735 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 736 | EnsureFromSpaceIsCommitted(); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 737 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 738 | int start_new_space_size = Heap::new_space()->SizeAsInt(); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 739 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 740 | if (IsHighSurvivalRate()) { |
| 741 | // We speed up the incremental marker if it is running so that it |
| 742 | // does not fall behind the rate of promotion, which would cause a |
| 743 | // constantly growing old space. |
| 744 | incremental_marking()->NotifyOfHighPromotionRate(); |
| 745 | } |
| 746 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 747 | if (collector == MARK_COMPACTOR) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 748 | // Perform mark-sweep with optional compaction. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 749 | MarkCompact(tracer); |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 750 | sweep_generation_++; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 751 | bool high_survival_rate_during_scavenges = IsHighSurvivalRate() && |
| 752 | IsStableOrIncreasingSurvivalTrend(); |
| 753 | |
| 754 | UpdateSurvivalRateTrend(start_new_space_size); |
| 755 | |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 756 | if (!new_space_high_promotion_mode_active_ && |
| 757 | new_space_.Capacity() == new_space_.MaximumCapacity() && |
| 758 | IsStableOrIncreasingSurvivalTrend() && |
| 759 | IsHighSurvivalRate()) { |
| 760 | // Stable high survival rates even though young generation is at |
| 761 | // maximum capacity indicates that most objects will be promoted. |
| 762 | // To decrease scavenger pauses and final mark-sweep pauses, we |
| 763 | // have to limit maximal capacity of the young generation. |
| 764 | new_space_high_promotion_mode_active_ = true; |
| 765 | if (FLAG_trace_gc) { |
| 766 | PrintF("Limited new space size due to high promotion rate: %d MB\n", |
| 767 | new_space_.InitialCapacity() / MB); |
| 768 | } |
| 769 | } else if (new_space_high_promotion_mode_active_ && |
| 770 | IsDecreasingSurvivalTrend() && |
| 771 | !IsHighSurvivalRate()) { |
| 772 | // Decreasing low survival rates might indicate that the above high |
| 773 | // promotion mode is over and we should allow the young generation |
| 774 | // to grow again. |
| 775 | new_space_high_promotion_mode_active_ = false; |
| 776 | if (FLAG_trace_gc) { |
| 777 | PrintF("Unlimited new space size due to low promotion rate: %d MB\n", |
| 778 | new_space_.MaximumCapacity() / MB); |
| 779 | } |
| 780 | } |
| 781 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 782 | size_of_old_gen_at_last_old_space_gc_ = PromotedSpaceSize(); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 783 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 784 | if (high_survival_rate_during_scavenges && |
| 785 | IsStableOrIncreasingSurvivalTrend()) { |
| 786 | // Stable high survival rates of young objects both during partial and |
| 787 | // full collection indicate that mutator is either building or modifying |
| 788 | // a structure with a long lifetime. |
| 789 | // In this case we aggressively raise old generation memory limits to |
| 790 | // postpone subsequent mark-sweep collection and thus trade memory |
| 791 | // space for the mutation speed. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 792 | old_gen_limit_factor_ = 2; |
| 793 | } else { |
| 794 | old_gen_limit_factor_ = 1; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 795 | } |
| 796 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 797 | old_gen_promotion_limit_ = |
| 798 | OldGenPromotionLimit(size_of_old_gen_at_last_old_space_gc_); |
| 799 | old_gen_allocation_limit_ = |
| 800 | OldGenAllocationLimit(size_of_old_gen_at_last_old_space_gc_); |
| 801 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 802 | old_gen_exhausted_ = false; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 803 | } else { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 804 | tracer_ = tracer; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 805 | Scavenge(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 806 | tracer_ = NULL; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 807 | |
| 808 | UpdateSurvivalRateTrend(start_new_space_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 809 | } |
ager@chromium.org | 439e85a | 2009-08-26 13:15:29 +0000 | [diff] [blame] | 810 | |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 811 | if (new_space_high_promotion_mode_active_ && |
| 812 | new_space_.Capacity() > new_space_.InitialCapacity()) { |
| 813 | new_space_.Shrink(); |
| 814 | } |
| 815 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 816 | isolate_->counters()->objs_since_last_young()->Set(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 817 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 818 | gc_post_processing_depth_++; |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 819 | { DisableAssertNoAllocation allow_allocation; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 820 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 821 | next_gc_likely_to_collect_more = |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 822 | isolate_->global_handles()->PostGarbageCollectionProcessing(collector); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 823 | } |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 824 | gc_post_processing_depth_--; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 825 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 826 | // Update relocatables. |
| 827 | Relocatable::PostGarbageCollectionProcessing(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 828 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 829 | if (collector == MARK_COMPACTOR) { |
| 830 | // Register the amount of external allocated memory. |
| 831 | amount_of_external_allocated_memory_at_last_global_gc_ = |
| 832 | amount_of_external_allocated_memory_; |
| 833 | } |
| 834 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 835 | GCCallbackFlags callback_flags = kNoGCCallbackFlags; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 836 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 837 | if (gc_type & gc_epilogue_callbacks_[i].gc_type) { |
| 838 | gc_epilogue_callbacks_[i].callback(gc_type, callback_flags); |
| 839 | } |
| 840 | } |
| 841 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 842 | if (collector == MARK_COMPACTOR && global_gc_epilogue_callback_) { |
| 843 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 844 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 845 | global_gc_epilogue_callback_(); |
| 846 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 847 | if (FLAG_verify_heap) { |
| 848 | VerifySymbolTable(); |
| 849 | } |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 850 | |
| 851 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 855 | void Heap::MarkCompact(GCTracer* tracer) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 856 | gc_state_ = MARK_COMPACT; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 857 | LOG(isolate_, ResourceEvent("markcompact", "begin")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 858 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 859 | mark_compact_collector_.Prepare(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 860 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 861 | ms_count_++; |
| 862 | tracer->set_full_gc_count(ms_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 863 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 864 | MarkCompactPrologue(); |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 865 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 866 | mark_compact_collector_.CollectGarbage(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 867 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 868 | LOG(isolate_, ResourceEvent("markcompact", "end")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 869 | |
| 870 | gc_state_ = NOT_IN_GC; |
| 871 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 872 | isolate_->counters()->objs_since_last_full()->Set(0); |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 873 | |
| 874 | contexts_disposed_ = 0; |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 875 | |
| 876 | isolate_->set_context_exit_happened(false); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 880 | void Heap::MarkCompactPrologue() { |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 881 | // At any old GC clear the keyed lookup cache to enable collection of unused |
| 882 | // maps. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 883 | isolate_->keyed_lookup_cache()->Clear(); |
| 884 | isolate_->context_slot_cache()->Clear(); |
| 885 | isolate_->descriptor_lookup_cache()->Clear(); |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 886 | StringSplitCache::Clear(string_split_cache()); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 887 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 888 | isolate_->compilation_cache()->MarkCompactPrologue(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 889 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 890 | CompletelyClearInstanceofCache(); |
| 891 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 892 | // TODO(1605) select heuristic for flushing NumberString cache with |
| 893 | // FlushNumberStringCache |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 894 | if (FLAG_cleanup_code_caches_at_gc) { |
| 895 | polymorphic_code_cache()->set_cache(undefined_value()); |
| 896 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 897 | |
| 898 | ClearNormalizedMapCaches(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 902 | Object* Heap::FindCodeObject(Address a) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 903 | return isolate()->inner_pointer_to_code_cache()-> |
| 904 | GcSafeFindCodeForInnerPointer(a); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | |
| 908 | // Helper class for copying HeapObjects |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 909 | class ScavengeVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 910 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 911 | explicit ScavengeVisitor(Heap* heap) : heap_(heap) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 912 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 913 | void VisitPointer(Object** p) { ScavengePointer(p); } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 914 | |
| 915 | void VisitPointers(Object** start, Object** end) { |
| 916 | // Copy all HeapObject pointers in [start, end) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 917 | for (Object** p = start; p < end; p++) ScavengePointer(p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | private: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 921 | void ScavengePointer(Object** p) { |
| 922 | Object* object = *p; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 923 | if (!heap_->InNewSpace(object)) return; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 924 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 925 | reinterpret_cast<HeapObject*>(object)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 926 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 927 | |
| 928 | Heap* heap_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 929 | }; |
| 930 | |
| 931 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 932 | #ifdef DEBUG |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 933 | // Visitor class to verify pointers in code or data space do not point into |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 934 | // new space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 935 | class VerifyNonPointerSpacePointersVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 936 | public: |
| 937 | void VisitPointers(Object** start, Object**end) { |
| 938 | for (Object** current = start; current < end; current++) { |
| 939 | if ((*current)->IsHeapObject()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 940 | ASSERT(!HEAP->InNewSpace(HeapObject::cast(*current))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 941 | } |
| 942 | } |
| 943 | } |
| 944 | }; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 945 | |
| 946 | |
| 947 | static void VerifyNonPointerSpacePointers() { |
| 948 | // Verify that there are no pointers to new space in spaces where we |
| 949 | // do not expect them. |
| 950 | VerifyNonPointerSpacePointersVisitor v; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 951 | HeapObjectIterator code_it(HEAP->code_space()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 952 | for (HeapObject* object = code_it.Next(); |
| 953 | object != NULL; object = code_it.Next()) |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 954 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 955 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 956 | // The old data space was normally swept conservatively so that the iterator |
| 957 | // doesn't work, so we normally skip the next bit. |
| 958 | if (!HEAP->old_data_space()->was_swept_conservatively()) { |
| 959 | HeapObjectIterator data_it(HEAP->old_data_space()); |
| 960 | for (HeapObject* object = data_it.Next(); |
| 961 | object != NULL; object = data_it.Next()) |
| 962 | object->Iterate(&v); |
| 963 | } |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 964 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 965 | #endif |
| 966 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 967 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 968 | void Heap::CheckNewSpaceExpansionCriteria() { |
| 969 | if (new_space_.Capacity() < new_space_.MaximumCapacity() && |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 970 | survived_since_last_expansion_ > new_space_.Capacity() && |
| 971 | !new_space_high_promotion_mode_active_) { |
| 972 | // Grow the size of new space if there is room to grow, enough data |
| 973 | // has survived scavenge since the last expansion and we are not in |
| 974 | // high promotion mode. |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 975 | new_space_.Grow(); |
| 976 | survived_since_last_expansion_ = 0; |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 981 | static bool IsUnscavengedHeapObject(Heap* heap, Object** p) { |
| 982 | return heap->InNewSpace(*p) && |
| 983 | !HeapObject::cast(*p)->map_word().IsForwardingAddress(); |
| 984 | } |
| 985 | |
| 986 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 987 | void Heap::ScavengeStoreBufferCallback( |
| 988 | Heap* heap, |
| 989 | MemoryChunk* page, |
| 990 | StoreBufferEvent event) { |
| 991 | heap->store_buffer_rebuilder_.Callback(page, event); |
| 992 | } |
| 993 | |
| 994 | |
| 995 | void StoreBufferRebuilder::Callback(MemoryChunk* page, StoreBufferEvent event) { |
| 996 | if (event == kStoreBufferStartScanningPagesEvent) { |
| 997 | start_of_current_page_ = NULL; |
| 998 | current_page_ = NULL; |
| 999 | } else if (event == kStoreBufferScanningPageEvent) { |
| 1000 | if (current_page_ != NULL) { |
| 1001 | // If this page already overflowed the store buffer during this iteration. |
| 1002 | if (current_page_->scan_on_scavenge()) { |
| 1003 | // Then we should wipe out the entries that have been added for it. |
| 1004 | store_buffer_->SetTop(start_of_current_page_); |
| 1005 | } else if (store_buffer_->Top() - start_of_current_page_ >= |
| 1006 | (store_buffer_->Limit() - store_buffer_->Top()) >> 2) { |
| 1007 | // Did we find too many pointers in the previous page? The heuristic is |
| 1008 | // that no page can take more then 1/5 the remaining slots in the store |
| 1009 | // buffer. |
| 1010 | current_page_->set_scan_on_scavenge(true); |
| 1011 | store_buffer_->SetTop(start_of_current_page_); |
| 1012 | } else { |
| 1013 | // In this case the page we scanned took a reasonable number of slots in |
| 1014 | // the store buffer. It has now been rehabilitated and is no longer |
| 1015 | // marked scan_on_scavenge. |
| 1016 | ASSERT(!current_page_->scan_on_scavenge()); |
| 1017 | } |
| 1018 | } |
| 1019 | start_of_current_page_ = store_buffer_->Top(); |
| 1020 | current_page_ = page; |
| 1021 | } else if (event == kStoreBufferFullEvent) { |
| 1022 | // The current page overflowed the store buffer again. Wipe out its entries |
| 1023 | // in the store buffer and mark it scan-on-scavenge again. This may happen |
| 1024 | // several times while scanning. |
| 1025 | if (current_page_ == NULL) { |
| 1026 | // Store Buffer overflowed while scanning promoted objects. These are not |
| 1027 | // in any particular page, though they are likely to be clustered by the |
| 1028 | // allocation routines. |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 1029 | store_buffer_->EnsureSpace(StoreBuffer::kStoreBufferSize); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1030 | } else { |
| 1031 | // Store Buffer overflowed while scanning a particular old space page for |
| 1032 | // pointers to new space. |
| 1033 | ASSERT(current_page_ == page); |
| 1034 | ASSERT(page != NULL); |
| 1035 | current_page_->set_scan_on_scavenge(true); |
| 1036 | ASSERT(start_of_current_page_ != store_buffer_->Top()); |
| 1037 | store_buffer_->SetTop(start_of_current_page_); |
| 1038 | } |
| 1039 | } else { |
| 1040 | UNREACHABLE(); |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1045 | void PromotionQueue::Initialize() { |
| 1046 | // Assumes that a NewSpacePage exactly fits a number of promotion queue |
| 1047 | // entries (where each is a pair of intptr_t). This allows us to simplify |
| 1048 | // the test fpr when to switch pages. |
| 1049 | ASSERT((Page::kPageSize - MemoryChunk::kBodyOffset) % (2 * kPointerSize) |
| 1050 | == 0); |
| 1051 | limit_ = reinterpret_cast<intptr_t*>(heap_->new_space()->ToSpaceStart()); |
| 1052 | front_ = rear_ = |
| 1053 | reinterpret_cast<intptr_t*>(heap_->new_space()->ToSpaceEnd()); |
| 1054 | emergency_stack_ = NULL; |
| 1055 | guard_ = false; |
| 1056 | } |
| 1057 | |
| 1058 | |
| 1059 | void PromotionQueue::RelocateQueueHead() { |
| 1060 | ASSERT(emergency_stack_ == NULL); |
| 1061 | |
| 1062 | Page* p = Page::FromAllocationTop(reinterpret_cast<Address>(rear_)); |
| 1063 | intptr_t* head_start = rear_; |
| 1064 | intptr_t* head_end = |
| 1065 | Min(front_, reinterpret_cast<intptr_t*>(p->body_limit())); |
| 1066 | |
| 1067 | int entries_count = |
| 1068 | static_cast<int>(head_end - head_start) / kEntrySizeInWords; |
| 1069 | |
| 1070 | emergency_stack_ = new List<Entry>(2 * entries_count); |
| 1071 | |
| 1072 | while (head_start != head_end) { |
| 1073 | int size = static_cast<int>(*(head_start++)); |
| 1074 | HeapObject* obj = reinterpret_cast<HeapObject*>(*(head_start++)); |
| 1075 | emergency_stack_->Add(Entry(obj, size)); |
| 1076 | } |
| 1077 | rear_ = head_end; |
| 1078 | } |
| 1079 | |
| 1080 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1081 | void Heap::Scavenge() { |
| 1082 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 1083 | if (FLAG_verify_heap) VerifyNonPointerSpacePointers(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1084 | #endif |
| 1085 | |
| 1086 | gc_state_ = SCAVENGE; |
| 1087 | |
| 1088 | // Implements Cheney's copying algorithm |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1089 | LOG(isolate_, ResourceEvent("scavenge", "begin")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1090 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1091 | // Clear descriptor cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1092 | isolate_->descriptor_lookup_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1093 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1094 | // Used for updating survived_since_last_expansion_ at function end. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 1095 | intptr_t survived_watermark = PromotedSpaceSize(); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1096 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1097 | CheckNewSpaceExpansionCriteria(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1098 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1099 | SelectScavengingVisitorsTable(); |
| 1100 | |
| 1101 | incremental_marking()->PrepareForScavenge(); |
| 1102 | |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 1103 | AdvanceSweepers(static_cast<int>(new_space_.Size())); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1104 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1105 | // Flip the semispaces. After flipping, to space is empty, from space has |
| 1106 | // live objects. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1107 | new_space_.Flip(); |
| 1108 | new_space_.ResetAllocationInfo(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1109 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1110 | // We need to sweep newly copied objects which can be either in the |
| 1111 | // to space or promoted to the old generation. For to-space |
| 1112 | // objects, we treat the bottom of the to space as a queue. Newly |
| 1113 | // copied and unswept objects lie between a 'front' mark and the |
| 1114 | // allocation pointer. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1115 | // |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1116 | // Promoted objects can go into various old-generation spaces, and |
| 1117 | // can be allocated internally in the spaces (from the free list). |
| 1118 | // We treat the top of the to space as a queue of addresses of |
| 1119 | // promoted objects. The addresses of newly promoted and unswept |
| 1120 | // objects lie between a 'front' mark and a 'rear' mark that is |
| 1121 | // updated as a side effect of promoting an object. |
| 1122 | // |
| 1123 | // There is guaranteed to be enough room at the top of the to space |
| 1124 | // for the addresses of promoted objects: every object promoted |
| 1125 | // frees up its size in bytes from the top of the new space, and |
| 1126 | // objects are at least one pointer in size. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1127 | Address new_space_front = new_space_.ToSpaceStart(); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1128 | promotion_queue_.Initialize(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1129 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1130 | #ifdef DEBUG |
| 1131 | store_buffer()->Clean(); |
| 1132 | #endif |
| 1133 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1134 | ScavengeVisitor scavenge_visitor(this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1135 | // Copy roots. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1136 | IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1137 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1138 | // Copy objects reachable from the old generation. |
| 1139 | { |
| 1140 | StoreBufferRebuildScope scope(this, |
| 1141 | store_buffer(), |
| 1142 | &ScavengeStoreBufferCallback); |
| 1143 | store_buffer()->IteratePointersToNewSpace(&ScavengeObject); |
| 1144 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1145 | |
| 1146 | // Copy objects reachable from cells by scavenging cell values directly. |
| 1147 | HeapObjectIterator cell_iterator(cell_space_); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1148 | for (HeapObject* cell = cell_iterator.Next(); |
| 1149 | cell != NULL; cell = cell_iterator.Next()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1150 | if (cell->IsJSGlobalPropertyCell()) { |
| 1151 | Address value_address = |
| 1152 | reinterpret_cast<Address>(cell) + |
| 1153 | (JSGlobalPropertyCell::kValueOffset - kHeapObjectTag); |
| 1154 | scavenge_visitor.VisitPointer(reinterpret_cast<Object**>(value_address)); |
| 1155 | } |
| 1156 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1157 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1158 | // Scavenge object reachable from the global contexts list directly. |
| 1159 | scavenge_visitor.VisitPointer(BitCast<Object**>(&global_contexts_list_)); |
| 1160 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1161 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1162 | isolate_->global_handles()->IdentifyNewSpaceWeakIndependentHandles( |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 1163 | &IsUnscavengedHeapObject); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1164 | isolate_->global_handles()->IterateNewSpaceWeakIndependentRoots( |
| 1165 | &scavenge_visitor); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 1166 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
| 1167 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1168 | UpdateNewSpaceReferencesInExternalStringTable( |
| 1169 | &UpdateNewSpaceReferenceInExternalStringTableEntry); |
| 1170 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1171 | promotion_queue_.Destroy(); |
| 1172 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1173 | LiveObjectList::UpdateReferencesForScavengeGC(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1174 | isolate()->runtime_profiler()->UpdateSamplesAfterScavenge(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1175 | incremental_marking()->UpdateMarkingDequeAfterScavenge(); |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1176 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1177 | ASSERT(new_space_front == new_space_.top()); |
| 1178 | |
| 1179 | // Set age mark. |
| 1180 | new_space_.set_age_mark(new_space_.top()); |
| 1181 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1182 | new_space_.LowerInlineAllocationLimit( |
| 1183 | new_space_.inline_allocation_limit_step()); |
| 1184 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1185 | // Update how much has survived scavenge. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 1186 | IncrementYoungSurvivorsCounter(static_cast<int>( |
| 1187 | (PromotedSpaceSize() - survived_watermark) + new_space_.Size())); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1188 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1189 | LOG(isolate_, ResourceEvent("scavenge", "end")); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1190 | |
| 1191 | gc_state_ = NOT_IN_GC; |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 1192 | |
| 1193 | scavenges_since_last_idle_round_++; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1194 | } |
| 1195 | |
| 1196 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1197 | String* Heap::UpdateNewSpaceReferenceInExternalStringTableEntry(Heap* heap, |
| 1198 | Object** p) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1199 | MapWord first_word = HeapObject::cast(*p)->map_word(); |
| 1200 | |
| 1201 | if (!first_word.IsForwardingAddress()) { |
| 1202 | // Unreachable external string can be finalized. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1203 | heap->FinalizeExternalString(String::cast(*p)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1204 | return NULL; |
| 1205 | } |
| 1206 | |
| 1207 | // String is still reachable. |
| 1208 | return String::cast(first_word.ToForwardingAddress()); |
| 1209 | } |
| 1210 | |
| 1211 | |
| 1212 | void Heap::UpdateNewSpaceReferencesInExternalStringTable( |
| 1213 | ExternalStringTableUpdaterCallback updater_func) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 1214 | if (FLAG_verify_heap) { |
| 1215 | external_string_table_.Verify(); |
| 1216 | } |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1217 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1218 | if (external_string_table_.new_space_strings_.is_empty()) return; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1219 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1220 | Object** start = &external_string_table_.new_space_strings_[0]; |
| 1221 | Object** end = start + external_string_table_.new_space_strings_.length(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1222 | Object** last = start; |
| 1223 | |
| 1224 | for (Object** p = start; p < end; ++p) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1225 | ASSERT(InFromSpace(*p)); |
| 1226 | String* target = updater_func(this, p); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1227 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1228 | if (target == NULL) continue; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1229 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1230 | ASSERT(target->IsExternalString()); |
| 1231 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1232 | if (InNewSpace(target)) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1233 | // String is still in new space. Update the table entry. |
| 1234 | *last = target; |
| 1235 | ++last; |
| 1236 | } else { |
| 1237 | // String got promoted. Move it to the old string list. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1238 | external_string_table_.AddOldString(target); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1239 | } |
| 1240 | } |
| 1241 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1242 | ASSERT(last <= end); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1243 | external_string_table_.ShrinkNewStrings(static_cast<int>(last - start)); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1244 | } |
| 1245 | |
| 1246 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1247 | void Heap::UpdateReferencesInExternalStringTable( |
| 1248 | ExternalStringTableUpdaterCallback updater_func) { |
| 1249 | |
| 1250 | // Update old space string references. |
| 1251 | if (external_string_table_.old_space_strings_.length() > 0) { |
| 1252 | Object** start = &external_string_table_.old_space_strings_[0]; |
| 1253 | Object** end = start + external_string_table_.old_space_strings_.length(); |
| 1254 | for (Object** p = start; p < end; ++p) *p = updater_func(this, p); |
| 1255 | } |
| 1256 | |
| 1257 | UpdateNewSpaceReferencesInExternalStringTable(updater_func); |
| 1258 | } |
| 1259 | |
| 1260 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1261 | static Object* ProcessFunctionWeakReferences(Heap* heap, |
| 1262 | Object* function, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1263 | WeakObjectRetainer* retainer) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1264 | Object* undefined = heap->undefined_value(); |
| 1265 | Object* head = undefined; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1266 | JSFunction* tail = NULL; |
| 1267 | Object* candidate = function; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1268 | while (candidate != undefined) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1269 | // Check whether to keep the candidate in the list. |
| 1270 | JSFunction* candidate_function = reinterpret_cast<JSFunction*>(candidate); |
| 1271 | Object* retain = retainer->RetainAs(candidate); |
| 1272 | if (retain != NULL) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1273 | if (head == undefined) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1274 | // First element in the list. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1275 | head = retain; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1276 | } else { |
| 1277 | // Subsequent elements in the list. |
| 1278 | ASSERT(tail != NULL); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1279 | tail->set_next_function_link(retain); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1280 | } |
| 1281 | // Retained function is new tail. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1282 | candidate_function = reinterpret_cast<JSFunction*>(retain); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1283 | tail = candidate_function; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1284 | |
| 1285 | ASSERT(retain->IsUndefined() || retain->IsJSFunction()); |
| 1286 | |
| 1287 | if (retain == undefined) break; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1288 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1289 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1290 | // Move to next element in the list. |
| 1291 | candidate = candidate_function->next_function_link(); |
| 1292 | } |
| 1293 | |
| 1294 | // Terminate the list if there is one or more elements. |
| 1295 | if (tail != NULL) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1296 | tail->set_next_function_link(undefined); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1297 | } |
| 1298 | |
| 1299 | return head; |
| 1300 | } |
| 1301 | |
| 1302 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1303 | void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1304 | Object* undefined = undefined_value(); |
| 1305 | Object* head = undefined; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1306 | Context* tail = NULL; |
| 1307 | Object* candidate = global_contexts_list_; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1308 | while (candidate != undefined) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1309 | // Check whether to keep the candidate in the list. |
| 1310 | Context* candidate_context = reinterpret_cast<Context*>(candidate); |
| 1311 | Object* retain = retainer->RetainAs(candidate); |
| 1312 | if (retain != NULL) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1313 | if (head == undefined) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1314 | // First element in the list. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1315 | head = retain; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1316 | } else { |
| 1317 | // Subsequent elements in the list. |
| 1318 | ASSERT(tail != NULL); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1319 | tail->set_unchecked(this, |
| 1320 | Context::NEXT_CONTEXT_LINK, |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1321 | retain, |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1322 | UPDATE_WRITE_BARRIER); |
| 1323 | } |
| 1324 | // Retained context is new tail. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1325 | candidate_context = reinterpret_cast<Context*>(retain); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1326 | tail = candidate_context; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1327 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1328 | if (retain == undefined) break; |
| 1329 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1330 | // Process the weak list of optimized functions for the context. |
| 1331 | Object* function_list_head = |
| 1332 | ProcessFunctionWeakReferences( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1333 | this, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1334 | candidate_context->get(Context::OPTIMIZED_FUNCTIONS_LIST), |
| 1335 | retainer); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1336 | candidate_context->set_unchecked(this, |
| 1337 | Context::OPTIMIZED_FUNCTIONS_LIST, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1338 | function_list_head, |
| 1339 | UPDATE_WRITE_BARRIER); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1340 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1341 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1342 | // Move to next element in the list. |
| 1343 | candidate = candidate_context->get(Context::NEXT_CONTEXT_LINK); |
| 1344 | } |
| 1345 | |
| 1346 | // Terminate the list if there is one or more elements. |
| 1347 | if (tail != NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1348 | tail->set_unchecked(this, |
| 1349 | Context::NEXT_CONTEXT_LINK, |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1350 | Heap::undefined_value(), |
| 1351 | UPDATE_WRITE_BARRIER); |
| 1352 | } |
| 1353 | |
| 1354 | // Update the head of the list of contexts. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1355 | global_contexts_list_ = head; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1356 | } |
| 1357 | |
| 1358 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 1359 | void Heap::VisitExternalResources(v8::ExternalResourceVisitor* visitor) { |
| 1360 | AssertNoAllocation no_allocation; |
| 1361 | |
| 1362 | class VisitorAdapter : public ObjectVisitor { |
| 1363 | public: |
| 1364 | explicit VisitorAdapter(v8::ExternalResourceVisitor* visitor) |
| 1365 | : visitor_(visitor) {} |
| 1366 | virtual void VisitPointers(Object** start, Object** end) { |
| 1367 | for (Object** p = start; p < end; p++) { |
| 1368 | if ((*p)->IsExternalString()) { |
| 1369 | visitor_->VisitExternalString(Utils::ToLocal( |
| 1370 | Handle<String>(String::cast(*p)))); |
| 1371 | } |
| 1372 | } |
| 1373 | } |
| 1374 | private: |
| 1375 | v8::ExternalResourceVisitor* visitor_; |
| 1376 | } visitor_adapter(visitor); |
| 1377 | external_string_table_.Iterate(&visitor_adapter); |
| 1378 | } |
| 1379 | |
| 1380 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1381 | class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> { |
| 1382 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1383 | static inline void VisitPointer(Heap* heap, Object** p) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1384 | Object* object = *p; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1385 | if (!heap->InNewSpace(object)) return; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1386 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 1387 | reinterpret_cast<HeapObject*>(object)); |
| 1388 | } |
| 1389 | }; |
| 1390 | |
| 1391 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1392 | Address Heap::DoScavenge(ObjectVisitor* scavenge_visitor, |
| 1393 | Address new_space_front) { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1394 | do { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1395 | SemiSpace::AssertValidRange(new_space_front, new_space_.top()); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1396 | // The addresses new_space_front and new_space_.top() define a |
| 1397 | // queue of unprocessed copied objects. Process them until the |
| 1398 | // queue is empty. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1399 | while (new_space_front != new_space_.top()) { |
| 1400 | if (!NewSpacePage::IsAtEnd(new_space_front)) { |
| 1401 | HeapObject* object = HeapObject::FromAddress(new_space_front); |
| 1402 | new_space_front += |
| 1403 | NewSpaceScavenger::IterateBody(object->map(), object); |
| 1404 | } else { |
| 1405 | new_space_front = |
| 1406 | NewSpacePage::FromLimit(new_space_front)->next_page()->body(); |
| 1407 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1408 | } |
| 1409 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1410 | // Promote and process all the to-be-promoted objects. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1411 | { |
| 1412 | StoreBufferRebuildScope scope(this, |
| 1413 | store_buffer(), |
| 1414 | &ScavengeStoreBufferCallback); |
| 1415 | while (!promotion_queue()->is_empty()) { |
| 1416 | HeapObject* target; |
| 1417 | int size; |
| 1418 | promotion_queue()->remove(&target, &size); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1419 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1420 | // Promoted object might be already partially visited |
| 1421 | // during old space pointer iteration. Thus we search specificly |
| 1422 | // for pointers to from semispace instead of looking for pointers |
| 1423 | // to new space. |
| 1424 | ASSERT(!target->IsMap()); |
| 1425 | IterateAndMarkPointersToFromSpace(target->address(), |
| 1426 | target->address() + size, |
| 1427 | &ScavengeObject); |
| 1428 | } |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1429 | } |
| 1430 | |
| 1431 | // Take another spin if there are now unswept objects in new space |
| 1432 | // (there are currently no more unswept promoted objects). |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1433 | } while (new_space_front != new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1434 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1435 | return new_space_front; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1436 | } |
| 1437 | |
| 1438 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1439 | enum LoggingAndProfiling { |
| 1440 | LOGGING_AND_PROFILING_ENABLED, |
| 1441 | LOGGING_AND_PROFILING_DISABLED |
| 1442 | }; |
| 1443 | |
| 1444 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1445 | enum MarksHandling { TRANSFER_MARKS, IGNORE_MARKS }; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1446 | |
| 1447 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1448 | template<MarksHandling marks_handling, |
| 1449 | LoggingAndProfiling logging_and_profiling_mode> |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1450 | class ScavengingVisitor : public StaticVisitorBase { |
| 1451 | public: |
| 1452 | static void Initialize() { |
| 1453 | table_.Register(kVisitSeqAsciiString, &EvacuateSeqAsciiString); |
| 1454 | table_.Register(kVisitSeqTwoByteString, &EvacuateSeqTwoByteString); |
| 1455 | table_.Register(kVisitShortcutCandidate, &EvacuateShortcutCandidate); |
| 1456 | table_.Register(kVisitByteArray, &EvacuateByteArray); |
| 1457 | table_.Register(kVisitFixedArray, &EvacuateFixedArray); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1458 | table_.Register(kVisitFixedDoubleArray, &EvacuateFixedDoubleArray); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1459 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1460 | table_.Register(kVisitGlobalContext, |
| 1461 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1462 | template VisitSpecialized<Context::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1463 | |
| 1464 | table_.Register(kVisitConsString, |
| 1465 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1466 | template VisitSpecialized<ConsString::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1467 | |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 1468 | table_.Register(kVisitSlicedString, |
| 1469 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1470 | template VisitSpecialized<SlicedString::kSize>); |
| 1471 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1472 | table_.Register(kVisitSharedFunctionInfo, |
| 1473 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1474 | template VisitSpecialized<SharedFunctionInfo::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1475 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 1476 | table_.Register(kVisitJSWeakMap, |
| 1477 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1478 | Visit); |
| 1479 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 1480 | table_.Register(kVisitJSRegExp, |
| 1481 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1482 | Visit); |
| 1483 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1484 | if (marks_handling == IGNORE_MARKS) { |
| 1485 | table_.Register(kVisitJSFunction, |
| 1486 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1487 | template VisitSpecialized<JSFunction::kSize>); |
| 1488 | } else { |
| 1489 | table_.Register(kVisitJSFunction, &EvacuateJSFunction); |
| 1490 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1491 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1492 | table_.RegisterSpecializations<ObjectEvacuationStrategy<DATA_OBJECT>, |
| 1493 | kVisitDataObject, |
| 1494 | kVisitDataObjectGeneric>(); |
| 1495 | |
| 1496 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1497 | kVisitJSObject, |
| 1498 | kVisitJSObjectGeneric>(); |
| 1499 | |
| 1500 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1501 | kVisitStruct, |
| 1502 | kVisitStructGeneric>(); |
| 1503 | } |
| 1504 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1505 | static VisitorDispatchTable<ScavengingCallback>* GetTable() { |
| 1506 | return &table_; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1507 | } |
| 1508 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1509 | private: |
| 1510 | enum ObjectContents { DATA_OBJECT, POINTER_OBJECT }; |
| 1511 | enum SizeRestriction { SMALL, UNKNOWN_SIZE }; |
| 1512 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1513 | static void RecordCopiedObject(Heap* heap, HeapObject* obj) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1514 | bool should_record = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1515 | #ifdef DEBUG |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1516 | should_record = FLAG_heap_stats; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1517 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1518 | should_record = should_record || FLAG_log_gc; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1519 | if (should_record) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1520 | if (heap->new_space()->Contains(obj)) { |
| 1521 | heap->new_space()->RecordAllocation(obj); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1522 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1523 | heap->new_space()->RecordPromotion(obj); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1524 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1525 | } |
| 1526 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1527 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1528 | // Helper function used by CopyObject to copy a source object to an |
| 1529 | // allocated target object and update the forwarding pointer in the source |
| 1530 | // object. Returns the target object. |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 1531 | INLINE(static void MigrateObject(Heap* heap, |
| 1532 | HeapObject* source, |
| 1533 | HeapObject* target, |
| 1534 | int size)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1535 | // Copy the content of source to target. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1536 | heap->CopyBlock(target->address(), source->address(), size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1537 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1538 | // Set the forwarding address. |
| 1539 | source->set_map_word(MapWord::FromForwardingAddress(target)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1540 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1541 | if (logging_and_profiling_mode == LOGGING_AND_PROFILING_ENABLED) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1542 | // Update NewSpace stats if necessary. |
| 1543 | RecordCopiedObject(heap, target); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1544 | HEAP_PROFILE(heap, ObjectMoveEvent(source->address(), target->address())); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1545 | Isolate* isolate = heap->isolate(); |
| 1546 | if (isolate->logger()->is_logging() || |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1547 | CpuProfiler::is_profiling(isolate)) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1548 | if (target->IsSharedFunctionInfo()) { |
| 1549 | PROFILE(isolate, SharedFunctionInfoMoveEvent( |
| 1550 | source->address(), target->address())); |
| 1551 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 1552 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1553 | } |
| 1554 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1555 | if (marks_handling == TRANSFER_MARKS) { |
| 1556 | if (Marking::TransferColor(source, target)) { |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 1557 | MemoryChunk::IncrementLiveBytesFromGC(target->address(), size); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1558 | } |
| 1559 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1560 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1561 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1562 | template<ObjectContents object_contents, SizeRestriction size_restriction> |
| 1563 | static inline void EvacuateObject(Map* map, |
| 1564 | HeapObject** slot, |
| 1565 | HeapObject* object, |
| 1566 | int object_size) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 1567 | SLOW_ASSERT((size_restriction != SMALL) || |
| 1568 | (object_size <= Page::kMaxHeapObjectSize)); |
| 1569 | SLOW_ASSERT(object->Size() == object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1570 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1571 | Heap* heap = map->GetHeap(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1572 | if (heap->ShouldBePromoted(object->address(), object_size)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1573 | MaybeObject* maybe_result; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1574 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1575 | if ((size_restriction != SMALL) && |
| 1576 | (object_size > Page::kMaxHeapObjectSize)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1577 | maybe_result = heap->lo_space()->AllocateRaw(object_size, |
| 1578 | NOT_EXECUTABLE); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1579 | } else { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1580 | if (object_contents == DATA_OBJECT) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1581 | maybe_result = heap->old_data_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1582 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1583 | maybe_result = heap->old_pointer_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1584 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1585 | } |
| 1586 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1587 | Object* result = NULL; // Initialization to please compiler. |
| 1588 | if (maybe_result->ToObject(&result)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1589 | HeapObject* target = HeapObject::cast(result); |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 1590 | |
| 1591 | // Order is important: slot might be inside of the target if target |
| 1592 | // was allocated over a dead object and slot comes from the store |
| 1593 | // buffer. |
| 1594 | *slot = target; |
| 1595 | MigrateObject(heap, object, target, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1596 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1597 | if (object_contents == POINTER_OBJECT) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1598 | heap->promotion_queue()->insert(target, object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1599 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1600 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1601 | heap->tracer()->increment_promoted_objects_size(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1602 | return; |
| 1603 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1604 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1605 | MaybeObject* allocation = heap->new_space()->AllocateRaw(object_size); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 1606 | heap->promotion_queue()->SetNewLimit(heap->new_space()->top()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1607 | Object* result = allocation->ToObjectUnchecked(); |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 1608 | HeapObject* target = HeapObject::cast(result); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1609 | |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 1610 | // Order is important: slot might be inside of the target if target |
| 1611 | // was allocated over a dead object and slot comes from the store |
| 1612 | // buffer. |
| 1613 | *slot = target; |
| 1614 | MigrateObject(heap, object, target, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1615 | return; |
| 1616 | } |
| 1617 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1618 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1619 | static inline void EvacuateJSFunction(Map* map, |
| 1620 | HeapObject** slot, |
| 1621 | HeapObject* object) { |
| 1622 | ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1623 | template VisitSpecialized<JSFunction::kSize>(map, slot, object); |
| 1624 | |
| 1625 | HeapObject* target = *slot; |
| 1626 | MarkBit mark_bit = Marking::MarkBitFrom(target); |
| 1627 | if (Marking::IsBlack(mark_bit)) { |
| 1628 | // This object is black and it might not be rescanned by marker. |
| 1629 | // We should explicitly record code entry slot for compaction because |
| 1630 | // promotion queue processing (IterateAndMarkPointersToFromSpace) will |
| 1631 | // miss it as it is not HeapObject-tagged. |
| 1632 | Address code_entry_slot = |
| 1633 | target->address() + JSFunction::kCodeEntryOffset; |
| 1634 | Code* code = Code::cast(Code::GetObjectFromEntryAddress(code_entry_slot)); |
| 1635 | map->GetHeap()->mark_compact_collector()-> |
| 1636 | RecordCodeEntrySlot(code_entry_slot, code); |
| 1637 | } |
| 1638 | } |
| 1639 | |
| 1640 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1641 | static inline void EvacuateFixedArray(Map* map, |
| 1642 | HeapObject** slot, |
| 1643 | HeapObject* object) { |
| 1644 | int object_size = FixedArray::BodyDescriptor::SizeOf(map, object); |
| 1645 | EvacuateObject<POINTER_OBJECT, UNKNOWN_SIZE>(map, |
| 1646 | slot, |
| 1647 | object, |
| 1648 | object_size); |
| 1649 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1650 | |
| 1651 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1652 | static inline void EvacuateFixedDoubleArray(Map* map, |
| 1653 | HeapObject** slot, |
| 1654 | HeapObject* object) { |
| 1655 | int length = reinterpret_cast<FixedDoubleArray*>(object)->length(); |
| 1656 | int object_size = FixedDoubleArray::SizeFor(length); |
| 1657 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, |
| 1658 | slot, |
| 1659 | object, |
| 1660 | object_size); |
| 1661 | } |
| 1662 | |
| 1663 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1664 | static inline void EvacuateByteArray(Map* map, |
| 1665 | HeapObject** slot, |
| 1666 | HeapObject* object) { |
| 1667 | int object_size = reinterpret_cast<ByteArray*>(object)->ByteArraySize(); |
| 1668 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1669 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1670 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1671 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1672 | static inline void EvacuateSeqAsciiString(Map* map, |
| 1673 | HeapObject** slot, |
| 1674 | HeapObject* object) { |
| 1675 | int object_size = SeqAsciiString::cast(object)-> |
| 1676 | SeqAsciiStringSize(map->instance_type()); |
| 1677 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1678 | } |
| 1679 | |
| 1680 | |
| 1681 | static inline void EvacuateSeqTwoByteString(Map* map, |
| 1682 | HeapObject** slot, |
| 1683 | HeapObject* object) { |
| 1684 | int object_size = SeqTwoByteString::cast(object)-> |
| 1685 | SeqTwoByteStringSize(map->instance_type()); |
| 1686 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1687 | } |
| 1688 | |
| 1689 | |
| 1690 | static inline bool IsShortcutCandidate(int type) { |
| 1691 | return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| 1692 | } |
| 1693 | |
| 1694 | static inline void EvacuateShortcutCandidate(Map* map, |
| 1695 | HeapObject** slot, |
| 1696 | HeapObject* object) { |
| 1697 | ASSERT(IsShortcutCandidate(map->instance_type())); |
| 1698 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1699 | Heap* heap = map->GetHeap(); |
| 1700 | |
| 1701 | if (marks_handling == IGNORE_MARKS && |
| 1702 | ConsString::cast(object)->unchecked_second() == |
| 1703 | heap->empty_string()) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1704 | HeapObject* first = |
| 1705 | HeapObject::cast(ConsString::cast(object)->unchecked_first()); |
| 1706 | |
| 1707 | *slot = first; |
| 1708 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1709 | if (!heap->InNewSpace(first)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1710 | object->set_map_word(MapWord::FromForwardingAddress(first)); |
| 1711 | return; |
| 1712 | } |
| 1713 | |
| 1714 | MapWord first_word = first->map_word(); |
| 1715 | if (first_word.IsForwardingAddress()) { |
| 1716 | HeapObject* target = first_word.ToForwardingAddress(); |
| 1717 | |
| 1718 | *slot = target; |
| 1719 | object->set_map_word(MapWord::FromForwardingAddress(target)); |
| 1720 | return; |
| 1721 | } |
| 1722 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1723 | heap->DoScavengeObject(first->map(), slot, first); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1724 | object->set_map_word(MapWord::FromForwardingAddress(*slot)); |
| 1725 | return; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1726 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1727 | |
| 1728 | int object_size = ConsString::kSize; |
| 1729 | EvacuateObject<POINTER_OBJECT, SMALL>(map, slot, object, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1730 | } |
| 1731 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1732 | template<ObjectContents object_contents> |
| 1733 | class ObjectEvacuationStrategy { |
| 1734 | public: |
| 1735 | template<int object_size> |
| 1736 | static inline void VisitSpecialized(Map* map, |
| 1737 | HeapObject** slot, |
| 1738 | HeapObject* object) { |
| 1739 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1740 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1741 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1742 | static inline void Visit(Map* map, |
| 1743 | HeapObject** slot, |
| 1744 | HeapObject* object) { |
| 1745 | int object_size = map->instance_size(); |
| 1746 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1747 | } |
| 1748 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1749 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1750 | static VisitorDispatchTable<ScavengingCallback> table_; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1751 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1752 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1753 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1754 | template<MarksHandling marks_handling, |
| 1755 | LoggingAndProfiling logging_and_profiling_mode> |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1756 | VisitorDispatchTable<ScavengingCallback> |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1757 | ScavengingVisitor<marks_handling, logging_and_profiling_mode>::table_; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1758 | |
| 1759 | |
| 1760 | static void InitializeScavengingVisitorsTables() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1761 | ScavengingVisitor<TRANSFER_MARKS, |
| 1762 | LOGGING_AND_PROFILING_DISABLED>::Initialize(); |
| 1763 | ScavengingVisitor<IGNORE_MARKS, LOGGING_AND_PROFILING_DISABLED>::Initialize(); |
| 1764 | ScavengingVisitor<TRANSFER_MARKS, |
| 1765 | LOGGING_AND_PROFILING_ENABLED>::Initialize(); |
| 1766 | ScavengingVisitor<IGNORE_MARKS, LOGGING_AND_PROFILING_ENABLED>::Initialize(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1767 | } |
| 1768 | |
| 1769 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1770 | void Heap::SelectScavengingVisitorsTable() { |
| 1771 | bool logging_and_profiling = |
| 1772 | isolate()->logger()->is_logging() || |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1773 | CpuProfiler::is_profiling(isolate()) || |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1774 | (isolate()->heap_profiler() != NULL && |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1775 | isolate()->heap_profiler()->is_profiling()); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1776 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1777 | if (!incremental_marking()->IsMarking()) { |
| 1778 | if (!logging_and_profiling) { |
| 1779 | scavenging_visitors_table_.CopyFrom( |
| 1780 | ScavengingVisitor<IGNORE_MARKS, |
| 1781 | LOGGING_AND_PROFILING_DISABLED>::GetTable()); |
| 1782 | } else { |
| 1783 | scavenging_visitors_table_.CopyFrom( |
| 1784 | ScavengingVisitor<IGNORE_MARKS, |
| 1785 | LOGGING_AND_PROFILING_ENABLED>::GetTable()); |
| 1786 | } |
| 1787 | } else { |
| 1788 | if (!logging_and_profiling) { |
| 1789 | scavenging_visitors_table_.CopyFrom( |
| 1790 | ScavengingVisitor<TRANSFER_MARKS, |
| 1791 | LOGGING_AND_PROFILING_DISABLED>::GetTable()); |
| 1792 | } else { |
| 1793 | scavenging_visitors_table_.CopyFrom( |
| 1794 | ScavengingVisitor<TRANSFER_MARKS, |
| 1795 | LOGGING_AND_PROFILING_ENABLED>::GetTable()); |
| 1796 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 1797 | |
| 1798 | if (incremental_marking()->IsCompacting()) { |
| 1799 | // When compacting forbid short-circuiting of cons-strings. |
| 1800 | // Scavenging code relies on the fact that new space object |
| 1801 | // can't be evacuated into evacuation candidate but |
| 1802 | // short-circuiting violates this assumption. |
| 1803 | scavenging_visitors_table_.Register( |
| 1804 | StaticVisitorBase::kVisitShortcutCandidate, |
| 1805 | scavenging_visitors_table_.GetVisitorById( |
| 1806 | StaticVisitorBase::kVisitConsString)); |
| 1807 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1808 | } |
| 1809 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1810 | |
| 1811 | |
| 1812 | void Heap::ScavengeObjectSlow(HeapObject** p, HeapObject* object) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 1813 | SLOW_ASSERT(HEAP->InFromSpace(object)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1814 | MapWord first_word = object->map_word(); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 1815 | SLOW_ASSERT(!first_word.IsForwardingAddress()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1816 | Map* map = first_word.ToMap(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1817 | map->GetHeap()->DoScavengeObject(map, p, object); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1818 | } |
| 1819 | |
| 1820 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1821 | MaybeObject* Heap::AllocatePartialMap(InstanceType instance_type, |
| 1822 | int instance_size) { |
| 1823 | Object* result; |
| 1824 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1825 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1826 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1827 | |
| 1828 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1829 | reinterpret_cast<Map*>(result)->set_map(raw_unchecked_meta_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1830 | reinterpret_cast<Map*>(result)->set_instance_type(instance_type); |
| 1831 | reinterpret_cast<Map*>(result)->set_instance_size(instance_size); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1832 | reinterpret_cast<Map*>(result)->set_visitor_id( |
| 1833 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1834 | reinterpret_cast<Map*>(result)->set_inobject_properties(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1835 | reinterpret_cast<Map*>(result)->set_pre_allocated_property_fields(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1836 | reinterpret_cast<Map*>(result)->set_unused_property_fields(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1837 | reinterpret_cast<Map*>(result)->set_bit_field(0); |
| 1838 | reinterpret_cast<Map*>(result)->set_bit_field2(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1839 | return result; |
| 1840 | } |
| 1841 | |
| 1842 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1843 | MaybeObject* Heap::AllocateMap(InstanceType instance_type, |
| 1844 | int instance_size, |
| 1845 | ElementsKind elements_kind) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1846 | Object* result; |
| 1847 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1848 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1849 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1850 | |
| 1851 | Map* map = reinterpret_cast<Map*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 1852 | map->set_map_no_write_barrier(meta_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1853 | map->set_instance_type(instance_type); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1854 | map->set_visitor_id( |
| 1855 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 1856 | map->set_prototype(null_value(), SKIP_WRITE_BARRIER); |
| 1857 | map->set_constructor(null_value(), SKIP_WRITE_BARRIER); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1858 | map->set_instance_size(instance_size); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1859 | map->set_inobject_properties(0); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1860 | map->set_pre_allocated_property_fields(0); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1861 | map->init_instance_descriptors(); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 1862 | map->set_code_cache(empty_fixed_array(), SKIP_WRITE_BARRIER); |
| 1863 | map->set_prototype_transitions(empty_fixed_array(), SKIP_WRITE_BARRIER); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1864 | map->set_unused_property_fields(0); |
| 1865 | map->set_bit_field(0); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1866 | map->set_bit_field2(1 << Map::kIsExtensible); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1867 | map->set_elements_kind(elements_kind); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 1868 | |
| 1869 | // If the map object is aligned fill the padding area with Smi 0 objects. |
| 1870 | if (Map::kPadStart < Map::kSize) { |
| 1871 | memset(reinterpret_cast<byte*>(map) + Map::kPadStart - kHeapObjectTag, |
| 1872 | 0, |
| 1873 | Map::kSize - Map::kPadStart); |
| 1874 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1875 | return map; |
| 1876 | } |
| 1877 | |
| 1878 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1879 | MaybeObject* Heap::AllocateCodeCache() { |
| 1880 | Object* result; |
| 1881 | { MaybeObject* maybe_result = AllocateStruct(CODE_CACHE_TYPE); |
| 1882 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1883 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1884 | CodeCache* code_cache = CodeCache::cast(result); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 1885 | code_cache->set_default_cache(empty_fixed_array(), SKIP_WRITE_BARRIER); |
| 1886 | code_cache->set_normal_type_cache(undefined_value(), SKIP_WRITE_BARRIER); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1887 | return code_cache; |
| 1888 | } |
| 1889 | |
| 1890 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1891 | MaybeObject* Heap::AllocatePolymorphicCodeCache() { |
| 1892 | return AllocateStruct(POLYMORPHIC_CODE_CACHE_TYPE); |
| 1893 | } |
| 1894 | |
| 1895 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 1896 | MaybeObject* Heap::AllocateAccessorPair() { |
| 1897 | Object* result; |
| 1898 | { MaybeObject* maybe_result = AllocateStruct(ACCESSOR_PAIR_TYPE); |
| 1899 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1900 | } |
| 1901 | AccessorPair* accessors = AccessorPair::cast(result); |
| 1902 | // Later we will have to distinguish between undefined and the hole... |
| 1903 | // accessors->set_getter(the_hole_value(), SKIP_WRITE_BARRIER); |
| 1904 | // accessors->set_setter(the_hole_value(), SKIP_WRITE_BARRIER); |
| 1905 | return accessors; |
| 1906 | } |
| 1907 | |
| 1908 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1909 | const Heap::StringTypeTable Heap::string_type_table[] = { |
| 1910 | #define STRING_TYPE_ELEMENT(type, size, name, camel_name) \ |
| 1911 | {type, size, k##camel_name##MapRootIndex}, |
| 1912 | STRING_TYPE_LIST(STRING_TYPE_ELEMENT) |
| 1913 | #undef STRING_TYPE_ELEMENT |
| 1914 | }; |
| 1915 | |
| 1916 | |
| 1917 | const Heap::ConstantSymbolTable Heap::constant_symbol_table[] = { |
| 1918 | #define CONSTANT_SYMBOL_ELEMENT(name, contents) \ |
| 1919 | {contents, k##name##RootIndex}, |
| 1920 | SYMBOL_LIST(CONSTANT_SYMBOL_ELEMENT) |
| 1921 | #undef CONSTANT_SYMBOL_ELEMENT |
| 1922 | }; |
| 1923 | |
| 1924 | |
| 1925 | const Heap::StructTable Heap::struct_table[] = { |
| 1926 | #define STRUCT_TABLE_ELEMENT(NAME, Name, name) \ |
| 1927 | { NAME##_TYPE, Name::kSize, k##Name##MapRootIndex }, |
| 1928 | STRUCT_LIST(STRUCT_TABLE_ELEMENT) |
| 1929 | #undef STRUCT_TABLE_ELEMENT |
| 1930 | }; |
| 1931 | |
| 1932 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1933 | bool Heap::CreateInitialMaps() { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1934 | Object* obj; |
| 1935 | { MaybeObject* maybe_obj = AllocatePartialMap(MAP_TYPE, Map::kSize); |
| 1936 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1937 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1938 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1939 | Map* new_meta_map = reinterpret_cast<Map*>(obj); |
| 1940 | set_meta_map(new_meta_map); |
| 1941 | new_meta_map->set_map(new_meta_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1942 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1943 | { MaybeObject* maybe_obj = |
| 1944 | AllocatePartialMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1945 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1946 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1947 | set_fixed_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1948 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1949 | { MaybeObject* maybe_obj = AllocatePartialMap(ODDBALL_TYPE, Oddball::kSize); |
| 1950 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1951 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1952 | set_oddball_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1953 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 1954 | // Allocate the empty array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1955 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1956 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1957 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1958 | set_empty_fixed_array(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1959 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1960 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1961 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1962 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 1963 | set_null_value(Oddball::cast(obj)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1964 | Oddball::cast(obj)->set_kind(Oddball::kNull); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1965 | |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 1966 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_POINTER_SPACE); |
| 1967 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1968 | } |
| 1969 | set_undefined_value(Oddball::cast(obj)); |
| 1970 | Oddball::cast(obj)->set_kind(Oddball::kUndefined); |
| 1971 | ASSERT(!InNewSpace(undefined_value())); |
| 1972 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1973 | // Allocate the empty descriptor array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1974 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1975 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1976 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1977 | set_empty_descriptor_array(DescriptorArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1978 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1979 | // Fix the instance_descriptors for the existing maps. |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1980 | meta_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1981 | meta_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1982 | meta_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1983 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1984 | fixed_array_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1985 | fixed_array_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1986 | fixed_array_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1987 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1988 | oddball_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1989 | oddball_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1990 | oddball_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1991 | |
| 1992 | // Fix prototype object for existing maps. |
| 1993 | meta_map()->set_prototype(null_value()); |
| 1994 | meta_map()->set_constructor(null_value()); |
| 1995 | |
| 1996 | fixed_array_map()->set_prototype(null_value()); |
| 1997 | fixed_array_map()->set_constructor(null_value()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1998 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1999 | oddball_map()->set_prototype(null_value()); |
| 2000 | oddball_map()->set_constructor(null_value()); |
| 2001 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2002 | { MaybeObject* maybe_obj = |
| 2003 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2004 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2005 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 2006 | set_fixed_cow_array_map(Map::cast(obj)); |
| 2007 | ASSERT(fixed_array_map() != fixed_cow_array_map()); |
| 2008 | |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 2009 | { MaybeObject* maybe_obj = |
| 2010 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2011 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2012 | } |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 2013 | set_scope_info_map(Map::cast(obj)); |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 2014 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2015 | { MaybeObject* maybe_obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize); |
| 2016 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2017 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2018 | set_heap_number_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2019 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2020 | { MaybeObject* maybe_obj = AllocateMap(FOREIGN_TYPE, Foreign::kSize); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2021 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2022 | } |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2023 | set_foreign_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2024 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2025 | for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) { |
| 2026 | const StringTypeTable& entry = string_type_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2027 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 2028 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2029 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2030 | roots_[entry.index] = Map::cast(obj); |
| 2031 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2032 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2033 | { MaybeObject* maybe_obj = AllocateMap(STRING_TYPE, kVariableSizeSentinel); |
| 2034 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2035 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2036 | set_undetectable_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2037 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2038 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2039 | { MaybeObject* maybe_obj = |
| 2040 | AllocateMap(ASCII_STRING_TYPE, kVariableSizeSentinel); |
| 2041 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2042 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2043 | set_undetectable_ascii_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2044 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2045 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2046 | { MaybeObject* maybe_obj = |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 2047 | AllocateMap(FIXED_DOUBLE_ARRAY_TYPE, kVariableSizeSentinel); |
| 2048 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2049 | } |
| 2050 | set_fixed_double_array_map(Map::cast(obj)); |
| 2051 | |
| 2052 | { MaybeObject* maybe_obj = |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2053 | AllocateMap(BYTE_ARRAY_TYPE, kVariableSizeSentinel); |
| 2054 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2055 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2056 | set_byte_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2057 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2058 | { MaybeObject* maybe_obj = |
| 2059 | AllocateMap(FREE_SPACE_TYPE, kVariableSizeSentinel); |
| 2060 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2061 | } |
| 2062 | set_free_space_map(Map::cast(obj)); |
| 2063 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2064 | { MaybeObject* maybe_obj = AllocateByteArray(0, TENURED); |
| 2065 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2066 | } |
| 2067 | set_empty_byte_array(ByteArray::cast(obj)); |
| 2068 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2069 | { MaybeObject* maybe_obj = |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2070 | AllocateMap(EXTERNAL_PIXEL_ARRAY_TYPE, ExternalArray::kAlignedSize); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2071 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2072 | } |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2073 | set_external_pixel_array_map(Map::cast(obj)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2074 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2075 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_BYTE_ARRAY_TYPE, |
| 2076 | ExternalArray::kAlignedSize); |
| 2077 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2078 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2079 | set_external_byte_array_map(Map::cast(obj)); |
| 2080 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2081 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE, |
| 2082 | ExternalArray::kAlignedSize); |
| 2083 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2084 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2085 | set_external_unsigned_byte_array_map(Map::cast(obj)); |
| 2086 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2087 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_SHORT_ARRAY_TYPE, |
| 2088 | ExternalArray::kAlignedSize); |
| 2089 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2090 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2091 | set_external_short_array_map(Map::cast(obj)); |
| 2092 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2093 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE, |
| 2094 | ExternalArray::kAlignedSize); |
| 2095 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2096 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2097 | set_external_unsigned_short_array_map(Map::cast(obj)); |
| 2098 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2099 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_INT_ARRAY_TYPE, |
| 2100 | ExternalArray::kAlignedSize); |
| 2101 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2102 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2103 | set_external_int_array_map(Map::cast(obj)); |
| 2104 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2105 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_INT_ARRAY_TYPE, |
| 2106 | ExternalArray::kAlignedSize); |
| 2107 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2108 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2109 | set_external_unsigned_int_array_map(Map::cast(obj)); |
| 2110 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2111 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_FLOAT_ARRAY_TYPE, |
| 2112 | ExternalArray::kAlignedSize); |
| 2113 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2114 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2115 | set_external_float_array_map(Map::cast(obj)); |
| 2116 | |
whesse@chromium.org | 7b26015 | 2011-06-20 15:33:18 +0000 | [diff] [blame] | 2117 | { MaybeObject* maybe_obj = |
| 2118 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2119 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2120 | } |
| 2121 | set_non_strict_arguments_elements_map(Map::cast(obj)); |
| 2122 | |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 2123 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_DOUBLE_ARRAY_TYPE, |
| 2124 | ExternalArray::kAlignedSize); |
| 2125 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2126 | } |
| 2127 | set_external_double_array_map(Map::cast(obj)); |
| 2128 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2129 | { MaybeObject* maybe_obj = AllocateMap(CODE_TYPE, kVariableSizeSentinel); |
| 2130 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2131 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2132 | set_code_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2133 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2134 | { MaybeObject* maybe_obj = AllocateMap(JS_GLOBAL_PROPERTY_CELL_TYPE, |
| 2135 | JSGlobalPropertyCell::kSize); |
| 2136 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2137 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2138 | set_global_property_cell_map(Map::cast(obj)); |
| 2139 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2140 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, kPointerSize); |
| 2141 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2142 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2143 | set_one_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2144 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2145 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, 2 * kPointerSize); |
| 2146 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2147 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2148 | set_two_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2149 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2150 | for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) { |
| 2151 | const StructTable& entry = struct_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2152 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 2153 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2154 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2155 | roots_[entry.index] = Map::cast(obj); |
| 2156 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2157 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2158 | { MaybeObject* maybe_obj = |
| 2159 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2160 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2161 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2162 | set_hash_table_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2163 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2164 | { MaybeObject* maybe_obj = |
| 2165 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2166 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2167 | } |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 2168 | set_function_context_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2169 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2170 | { MaybeObject* maybe_obj = |
| 2171 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2172 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2173 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2174 | set_catch_context_map(Map::cast(obj)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2175 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2176 | { MaybeObject* maybe_obj = |
| 2177 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2178 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2179 | } |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 2180 | set_with_context_map(Map::cast(obj)); |
| 2181 | |
| 2182 | { MaybeObject* maybe_obj = |
| 2183 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2184 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2185 | } |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 2186 | set_block_context_map(Map::cast(obj)); |
| 2187 | |
| 2188 | { MaybeObject* maybe_obj = |
| 2189 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2190 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2191 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 2192 | Map* global_context_map = Map::cast(obj); |
| 2193 | global_context_map->set_visitor_id(StaticVisitorBase::kVisitGlobalContext); |
| 2194 | set_global_context_map(global_context_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2195 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2196 | { MaybeObject* maybe_obj = AllocateMap(SHARED_FUNCTION_INFO_TYPE, |
| 2197 | SharedFunctionInfo::kAlignedSize); |
| 2198 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2199 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2200 | set_shared_function_info_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2201 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2202 | { MaybeObject* maybe_obj = AllocateMap(JS_MESSAGE_OBJECT_TYPE, |
| 2203 | JSMessageObject::kSize); |
| 2204 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2205 | } |
| 2206 | set_message_object_map(Map::cast(obj)); |
| 2207 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2208 | ASSERT(!InNewSpace(empty_fixed_array())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2209 | return true; |
| 2210 | } |
| 2211 | |
| 2212 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2213 | MaybeObject* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2214 | // Statically ensure that it is safe to allocate heap numbers in paged |
| 2215 | // spaces. |
| 2216 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2217 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2218 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2219 | Object* result; |
| 2220 | { MaybeObject* maybe_result = |
| 2221 | AllocateRaw(HeapNumber::kSize, space, OLD_DATA_SPACE); |
| 2222 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2223 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2224 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 2225 | HeapObject::cast(result)->set_map_no_write_barrier(heap_number_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2226 | HeapNumber::cast(result)->set_value(value); |
| 2227 | return result; |
| 2228 | } |
| 2229 | |
| 2230 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2231 | MaybeObject* Heap::AllocateHeapNumber(double value) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2232 | // Use general version, if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2233 | if (always_allocate()) return AllocateHeapNumber(value, TENURED); |
| 2234 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2235 | // This version of AllocateHeapNumber is optimized for |
| 2236 | // allocation in new space. |
| 2237 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
| 2238 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2239 | Object* result; |
| 2240 | { MaybeObject* maybe_result = new_space_.AllocateRaw(HeapNumber::kSize); |
| 2241 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2242 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 2243 | HeapObject::cast(result)->set_map_no_write_barrier(heap_number_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2244 | HeapNumber::cast(result)->set_value(value); |
| 2245 | return result; |
| 2246 | } |
| 2247 | |
| 2248 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2249 | MaybeObject* Heap::AllocateJSGlobalPropertyCell(Object* value) { |
| 2250 | Object* result; |
| 2251 | { MaybeObject* maybe_result = AllocateRawCell(); |
| 2252 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2253 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 2254 | HeapObject::cast(result)->set_map_no_write_barrier( |
| 2255 | global_property_cell_map()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2256 | JSGlobalPropertyCell::cast(result)->set_value(value); |
| 2257 | return result; |
| 2258 | } |
| 2259 | |
| 2260 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2261 | MaybeObject* Heap::CreateOddball(const char* to_string, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2262 | Object* to_number, |
| 2263 | byte kind) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2264 | Object* result; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2265 | { MaybeObject* maybe_result = Allocate(oddball_map(), OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2266 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2267 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2268 | return Oddball::cast(result)->Initialize(to_string, to_number, kind); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2269 | } |
| 2270 | |
| 2271 | |
| 2272 | bool Heap::CreateApiObjects() { |
| 2273 | Object* obj; |
| 2274 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2275 | { MaybeObject* maybe_obj = AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| 2276 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2277 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2278 | // Don't use Smi-only elements optimizations for objects with the neander |
| 2279 | // map. There are too many cases where element values are set directly with a |
| 2280 | // bottleneck to trap the Smi-only -> fast elements transition, and there |
| 2281 | // appears to be no benefit for optimize this case. |
| 2282 | Map* new_neander_map = Map::cast(obj); |
| 2283 | new_neander_map->set_elements_kind(FAST_ELEMENTS); |
| 2284 | set_neander_map(new_neander_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2285 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2286 | { MaybeObject* maybe_obj = AllocateJSObjectFromMap(neander_map()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2287 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2288 | } |
| 2289 | Object* elements; |
| 2290 | { MaybeObject* maybe_elements = AllocateFixedArray(2); |
| 2291 | if (!maybe_elements->ToObject(&elements)) return false; |
| 2292 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2293 | FixedArray::cast(elements)->set(0, Smi::FromInt(0)); |
| 2294 | JSObject::cast(obj)->set_elements(FixedArray::cast(elements)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2295 | set_message_listeners(JSObject::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2296 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2297 | return true; |
| 2298 | } |
| 2299 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2300 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2301 | void Heap::CreateJSEntryStub() { |
| 2302 | JSEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2303 | set_js_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2304 | } |
| 2305 | |
| 2306 | |
| 2307 | void Heap::CreateJSConstructEntryStub() { |
| 2308 | JSConstructEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2309 | set_js_construct_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2310 | } |
| 2311 | |
| 2312 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2313 | void Heap::CreateFixedStubs() { |
| 2314 | // Here we create roots for fixed stubs. They are needed at GC |
| 2315 | // for cooking and uncooking (check out frames.cc). |
| 2316 | // The eliminates the need for doing dictionary lookup in the |
| 2317 | // stub cache for these stubs. |
| 2318 | HandleScope scope; |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2319 | // gcc-4.4 has problem generating correct code of following snippet: |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2320 | // { JSEntryStub stub; |
| 2321 | // js_entry_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2322 | // } |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2323 | // { JSConstructEntryStub stub; |
| 2324 | // js_construct_entry_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2325 | // } |
| 2326 | // To workaround the problem, make separate functions without inlining. |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2327 | Heap::CreateJSEntryStub(); |
| 2328 | Heap::CreateJSConstructEntryStub(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2329 | |
| 2330 | // Create stubs that should be there, so we don't unexpectedly have to |
| 2331 | // create them if we need them during the creation of another stub. |
| 2332 | // Stub creation mixes raw pointers and handles in an unsafe manner so |
| 2333 | // we cannot create stubs while we are creating stubs. |
| 2334 | CodeStub::GenerateStubsAheadOfTime(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2335 | } |
| 2336 | |
| 2337 | |
| 2338 | bool Heap::CreateInitialObjects() { |
| 2339 | Object* obj; |
| 2340 | |
| 2341 | // The -0 value must be set before NumberFromDouble works. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2342 | { MaybeObject* maybe_obj = AllocateHeapNumber(-0.0, TENURED); |
| 2343 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2344 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2345 | set_minus_zero_value(HeapNumber::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2346 | ASSERT(signbit(minus_zero_value()->Number()) != 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2347 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2348 | { MaybeObject* maybe_obj = AllocateHeapNumber(OS::nan_value(), TENURED); |
| 2349 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2350 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2351 | set_nan_value(HeapNumber::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2352 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2353 | { MaybeObject* maybe_obj = AllocateHeapNumber(V8_INFINITY, TENURED); |
| 2354 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2355 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2356 | set_infinity_value(HeapNumber::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2357 | |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 2358 | // The hole has not been created yet, but we want to put something |
| 2359 | // predictable in the gaps in the symbol table, so lets make that Smi zero. |
| 2360 | set_the_hole_value(reinterpret_cast<Oddball*>(Smi::FromInt(0))); |
| 2361 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2362 | // Allocate initial symbol table. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2363 | { MaybeObject* maybe_obj = SymbolTable::Allocate(kInitialSymbolTableSize); |
| 2364 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2365 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2366 | // Don't use set_symbol_table() due to asserts. |
| 2367 | roots_[kSymbolTableRootIndex] = obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2368 | |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2369 | // Finish initializing oddballs after creating symboltable. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2370 | { MaybeObject* maybe_obj = |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2371 | undefined_value()->Initialize("undefined", |
| 2372 | nan_value(), |
| 2373 | Oddball::kUndefined); |
| 2374 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2375 | } |
| 2376 | |
| 2377 | // Initialize the null_value. |
| 2378 | { MaybeObject* maybe_obj = |
| 2379 | null_value()->Initialize("null", Smi::FromInt(0), Oddball::kNull); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2380 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2381 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2382 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2383 | { MaybeObject* maybe_obj = CreateOddball("true", |
| 2384 | Smi::FromInt(1), |
| 2385 | Oddball::kTrue); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2386 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2387 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2388 | set_true_value(Oddball::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2389 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2390 | { MaybeObject* maybe_obj = CreateOddball("false", |
| 2391 | Smi::FromInt(0), |
| 2392 | Oddball::kFalse); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2393 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2394 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2395 | set_false_value(Oddball::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2396 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2397 | { MaybeObject* maybe_obj = CreateOddball("hole", |
| 2398 | Smi::FromInt(-1), |
| 2399 | Oddball::kTheHole); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2400 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2401 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2402 | set_the_hole_value(Oddball::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2403 | |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2404 | { MaybeObject* maybe_obj = CreateOddball("arguments_marker", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2405 | Smi::FromInt(-2), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2406 | Oddball::kArgumentMarker); |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2407 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2408 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2409 | set_arguments_marker(Oddball::cast(obj)); |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2410 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2411 | { MaybeObject* maybe_obj = CreateOddball("no_interceptor_result_sentinel", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2412 | Smi::FromInt(-3), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2413 | Oddball::kOther); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2414 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2415 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2416 | set_no_interceptor_result_sentinel(obj); |
| 2417 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2418 | { MaybeObject* maybe_obj = CreateOddball("termination_exception", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2419 | Smi::FromInt(-4), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2420 | Oddball::kOther); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2421 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2422 | } |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 2423 | set_termination_exception(obj); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2424 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2425 | { MaybeObject* maybe_obj = CreateOddball("frame_alignment_marker", |
| 2426 | Smi::FromInt(-5), |
| 2427 | Oddball::kOther); |
| 2428 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2429 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2430 | set_frame_alignment_marker(Oddball::cast(obj)); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2431 | STATIC_ASSERT(Oddball::kLeastHiddenOddballNumber == -5); |
| 2432 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2433 | // Allocate the empty string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2434 | { MaybeObject* maybe_obj = AllocateRawAsciiString(0, TENURED); |
| 2435 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2436 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2437 | set_empty_string(String::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2438 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2439 | for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2440 | { MaybeObject* maybe_obj = |
| 2441 | LookupAsciiSymbol(constant_symbol_table[i].contents); |
| 2442 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2443 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2444 | roots_[constant_symbol_table[i].index] = String::cast(obj); |
| 2445 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2446 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2447 | // Allocate the hidden symbol which is used to identify the hidden properties |
| 2448 | // in JSObjects. The hash code has a special value so that it will not match |
| 2449 | // the empty string when searching for the property. It cannot be part of the |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2450 | // loop above because it needs to be allocated manually with the special |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2451 | // hash code in place. The hash code for the hidden_symbol is zero to ensure |
| 2452 | // that it will always be at the first entry in property descriptors. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2453 | { MaybeObject* maybe_obj = |
| 2454 | AllocateSymbol(CStrVector(""), 0, String::kZeroHash); |
| 2455 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2456 | } |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2457 | hidden_symbol_ = String::cast(obj); |
| 2458 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2459 | // Allocate the foreign for __proto__. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2460 | { MaybeObject* maybe_obj = |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2461 | AllocateForeign((Address) &Accessors::ObjectPrototype); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2462 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2463 | } |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2464 | set_prototype_accessors(Foreign::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2465 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2466 | // Allocate the code_stubs dictionary. The initial size is set to avoid |
| 2467 | // expanding the dictionary during bootstrapping. |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 2468 | { MaybeObject* maybe_obj = UnseededNumberDictionary::Allocate(128); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2469 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2470 | } |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 2471 | set_code_stubs(UnseededNumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2472 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 2473 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2474 | // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size |
| 2475 | // is set to avoid expanding the dictionary during bootstrapping. |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 2476 | { MaybeObject* maybe_obj = UnseededNumberDictionary::Allocate(64); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2477 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2478 | } |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 2479 | set_non_monomorphic_cache(UnseededNumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2480 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 2481 | { MaybeObject* maybe_obj = AllocatePolymorphicCodeCache(); |
| 2482 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2483 | } |
| 2484 | set_polymorphic_code_cache(PolymorphicCodeCache::cast(obj)); |
| 2485 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 2486 | set_instanceof_cache_function(Smi::FromInt(0)); |
| 2487 | set_instanceof_cache_map(Smi::FromInt(0)); |
| 2488 | set_instanceof_cache_answer(Smi::FromInt(0)); |
| 2489 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2490 | CreateFixedStubs(); |
| 2491 | |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2492 | // Allocate the dictionary of intrinsic function names. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2493 | { MaybeObject* maybe_obj = StringDictionary::Allocate(Runtime::kNumFunctions); |
| 2494 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2495 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2496 | { MaybeObject* maybe_obj = Runtime::InitializeIntrinsicFunctionNames(this, |
| 2497 | obj); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2498 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2499 | } |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2500 | set_intrinsic_function_names(StringDictionary::cast(obj)); |
| 2501 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2502 | if (InitializeNumberStringCache()->IsFailure()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2503 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 2504 | // Allocate cache for single character ASCII strings. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2505 | { MaybeObject* maybe_obj = |
| 2506 | AllocateFixedArray(String::kMaxAsciiCharCode + 1, TENURED); |
| 2507 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2508 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2509 | set_single_character_string_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2510 | |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2511 | // Allocate cache for string split. |
| 2512 | { MaybeObject* maybe_obj = |
| 2513 | AllocateFixedArray(StringSplitCache::kStringSplitCacheSize, TENURED); |
| 2514 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2515 | } |
| 2516 | set_string_split_cache(FixedArray::cast(obj)); |
| 2517 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2518 | // Allocate cache for external strings pointing to native source code. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2519 | { MaybeObject* maybe_obj = AllocateFixedArray(Natives::GetBuiltinsCount()); |
| 2520 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2521 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2522 | set_natives_source_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2523 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2524 | // Handling of script id generation is in FACTORY->NewScript. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2525 | set_last_script_id(undefined_value()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 2526 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2527 | // Initialize keyed lookup cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2528 | isolate_->keyed_lookup_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2529 | |
| 2530 | // Initialize context slot cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2531 | isolate_->context_slot_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2532 | |
| 2533 | // Initialize descriptor cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2534 | isolate_->descriptor_lookup_cache()->Clear(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2535 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 2536 | // Initialize compilation cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2537 | isolate_->compilation_cache()->Clear(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2538 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2539 | return true; |
| 2540 | } |
| 2541 | |
| 2542 | |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2543 | Object* StringSplitCache::Lookup( |
| 2544 | FixedArray* cache, String* string, String* pattern) { |
| 2545 | if (!string->IsSymbol() || !pattern->IsSymbol()) return Smi::FromInt(0); |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2546 | uint32_t hash = string->Hash(); |
| 2547 | uint32_t index = ((hash & (kStringSplitCacheSize - 1)) & |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2548 | ~(kArrayEntriesPerCacheEntry - 1)); |
| 2549 | if (cache->get(index + kStringOffset) == string && |
| 2550 | cache->get(index + kPatternOffset) == pattern) { |
| 2551 | return cache->get(index + kArrayOffset); |
| 2552 | } |
| 2553 | index = ((index + kArrayEntriesPerCacheEntry) & (kStringSplitCacheSize - 1)); |
| 2554 | if (cache->get(index + kStringOffset) == string && |
| 2555 | cache->get(index + kPatternOffset) == pattern) { |
| 2556 | return cache->get(index + kArrayOffset); |
| 2557 | } |
| 2558 | return Smi::FromInt(0); |
| 2559 | } |
| 2560 | |
| 2561 | |
| 2562 | void StringSplitCache::Enter(Heap* heap, |
| 2563 | FixedArray* cache, |
| 2564 | String* string, |
| 2565 | String* pattern, |
| 2566 | FixedArray* array) { |
| 2567 | if (!string->IsSymbol() || !pattern->IsSymbol()) return; |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2568 | uint32_t hash = string->Hash(); |
| 2569 | uint32_t index = ((hash & (kStringSplitCacheSize - 1)) & |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2570 | ~(kArrayEntriesPerCacheEntry - 1)); |
| 2571 | if (cache->get(index + kStringOffset) == Smi::FromInt(0)) { |
| 2572 | cache->set(index + kStringOffset, string); |
| 2573 | cache->set(index + kPatternOffset, pattern); |
| 2574 | cache->set(index + kArrayOffset, array); |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2575 | } else { |
| 2576 | uint32_t index2 = |
| 2577 | ((index + kArrayEntriesPerCacheEntry) & (kStringSplitCacheSize - 1)); |
| 2578 | if (cache->get(index2 + kStringOffset) == Smi::FromInt(0)) { |
| 2579 | cache->set(index2 + kStringOffset, string); |
| 2580 | cache->set(index2 + kPatternOffset, pattern); |
| 2581 | cache->set(index2 + kArrayOffset, array); |
| 2582 | } else { |
| 2583 | cache->set(index2 + kStringOffset, Smi::FromInt(0)); |
| 2584 | cache->set(index2 + kPatternOffset, Smi::FromInt(0)); |
| 2585 | cache->set(index2 + kArrayOffset, Smi::FromInt(0)); |
| 2586 | cache->set(index + kStringOffset, string); |
| 2587 | cache->set(index + kPatternOffset, pattern); |
| 2588 | cache->set(index + kArrayOffset, array); |
| 2589 | } |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2590 | } |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2591 | if (array->length() < 100) { // Limit how many new symbols we want to make. |
| 2592 | for (int i = 0; i < array->length(); i++) { |
| 2593 | String* str = String::cast(array->get(i)); |
| 2594 | Object* symbol; |
| 2595 | MaybeObject* maybe_symbol = heap->LookupSymbol(str); |
| 2596 | if (maybe_symbol->ToObject(&symbol)) { |
| 2597 | array->set(i, symbol); |
| 2598 | } |
| 2599 | } |
| 2600 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 2601 | array->set_map_no_write_barrier(heap->fixed_cow_array_map()); |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2602 | } |
| 2603 | |
| 2604 | |
| 2605 | void StringSplitCache::Clear(FixedArray* cache) { |
| 2606 | for (int i = 0; i < kStringSplitCacheSize; i++) { |
| 2607 | cache->set(i, Smi::FromInt(0)); |
| 2608 | } |
| 2609 | } |
| 2610 | |
| 2611 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2612 | MaybeObject* Heap::InitializeNumberStringCache() { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2613 | // Compute the size of the number string cache based on the max heap size. |
| 2614 | // max_semispace_size_ == 512 KB => number_string_cache_size = 32. |
| 2615 | // max_semispace_size_ == 8 MB => number_string_cache_size = 16KB. |
| 2616 | int number_string_cache_size = max_semispace_size_ / 512; |
| 2617 | number_string_cache_size = Max(32, Min(16*KB, number_string_cache_size)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2618 | Object* obj; |
| 2619 | MaybeObject* maybe_obj = |
| 2620 | AllocateFixedArray(number_string_cache_size * 2, TENURED); |
| 2621 | if (maybe_obj->ToObject(&obj)) set_number_string_cache(FixedArray::cast(obj)); |
| 2622 | return maybe_obj; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2623 | } |
| 2624 | |
| 2625 | |
| 2626 | void Heap::FlushNumberStringCache() { |
| 2627 | // Flush the number to string cache. |
| 2628 | int len = number_string_cache()->length(); |
| 2629 | for (int i = 0; i < len; i++) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2630 | number_string_cache()->set_undefined(this, i); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2631 | } |
| 2632 | } |
| 2633 | |
| 2634 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2635 | static inline int double_get_hash(double d) { |
| 2636 | DoubleRepresentation rep(d); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2637 | return static_cast<int>(rep.bits) ^ static_cast<int>(rep.bits >> 32); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2638 | } |
| 2639 | |
| 2640 | |
| 2641 | static inline int smi_get_hash(Smi* smi) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2642 | return smi->value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2643 | } |
| 2644 | |
| 2645 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2646 | Object* Heap::GetNumberStringCache(Object* number) { |
| 2647 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2648 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2649 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2650 | hash = smi_get_hash(Smi::cast(number)) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2651 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2652 | hash = double_get_hash(number->Number()) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2653 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2654 | Object* key = number_string_cache()->get(hash * 2); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2655 | if (key == number) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2656 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2657 | } else if (key->IsHeapNumber() && |
| 2658 | number->IsHeapNumber() && |
| 2659 | key->Number() == number->Number()) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2660 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2661 | } |
| 2662 | return undefined_value(); |
| 2663 | } |
| 2664 | |
| 2665 | |
| 2666 | void Heap::SetNumberStringCache(Object* number, String* string) { |
| 2667 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2668 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2669 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2670 | hash = smi_get_hash(Smi::cast(number)) & mask; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2671 | number_string_cache()->set(hash * 2, Smi::cast(number)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2672 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2673 | hash = double_get_hash(number->Number()) & mask; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2674 | number_string_cache()->set(hash * 2, number); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2675 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2676 | number_string_cache()->set(hash * 2 + 1, string); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2677 | } |
| 2678 | |
| 2679 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2680 | MaybeObject* Heap::NumberToString(Object* number, |
| 2681 | bool check_number_string_cache) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2682 | isolate_->counters()->number_to_string_runtime()->Increment(); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 2683 | if (check_number_string_cache) { |
| 2684 | Object* cached = GetNumberStringCache(number); |
| 2685 | if (cached != undefined_value()) { |
| 2686 | return cached; |
| 2687 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2688 | } |
| 2689 | |
| 2690 | char arr[100]; |
| 2691 | Vector<char> buffer(arr, ARRAY_SIZE(arr)); |
| 2692 | const char* str; |
| 2693 | if (number->IsSmi()) { |
| 2694 | int num = Smi::cast(number)->value(); |
| 2695 | str = IntToCString(num, buffer); |
| 2696 | } else { |
| 2697 | double num = HeapNumber::cast(number)->value(); |
| 2698 | str = DoubleToCString(num, buffer); |
| 2699 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2700 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2701 | Object* js_string; |
| 2702 | MaybeObject* maybe_js_string = AllocateStringFromAscii(CStrVector(str)); |
| 2703 | if (maybe_js_string->ToObject(&js_string)) { |
| 2704 | SetNumberStringCache(number, String::cast(js_string)); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2705 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2706 | return maybe_js_string; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2707 | } |
| 2708 | |
| 2709 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2710 | MaybeObject* Heap::Uint32ToString(uint32_t value, |
| 2711 | bool check_number_string_cache) { |
| 2712 | Object* number; |
| 2713 | MaybeObject* maybe = NumberFromUint32(value); |
| 2714 | if (!maybe->To<Object>(&number)) return maybe; |
| 2715 | return NumberToString(number, check_number_string_cache); |
| 2716 | } |
| 2717 | |
| 2718 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2719 | Map* Heap::MapForExternalArrayType(ExternalArrayType array_type) { |
| 2720 | return Map::cast(roots_[RootIndexForExternalArrayType(array_type)]); |
| 2721 | } |
| 2722 | |
| 2723 | |
| 2724 | Heap::RootListIndex Heap::RootIndexForExternalArrayType( |
| 2725 | ExternalArrayType array_type) { |
| 2726 | switch (array_type) { |
| 2727 | case kExternalByteArray: |
| 2728 | return kExternalByteArrayMapRootIndex; |
| 2729 | case kExternalUnsignedByteArray: |
| 2730 | return kExternalUnsignedByteArrayMapRootIndex; |
| 2731 | case kExternalShortArray: |
| 2732 | return kExternalShortArrayMapRootIndex; |
| 2733 | case kExternalUnsignedShortArray: |
| 2734 | return kExternalUnsignedShortArrayMapRootIndex; |
| 2735 | case kExternalIntArray: |
| 2736 | return kExternalIntArrayMapRootIndex; |
| 2737 | case kExternalUnsignedIntArray: |
| 2738 | return kExternalUnsignedIntArrayMapRootIndex; |
| 2739 | case kExternalFloatArray: |
| 2740 | return kExternalFloatArrayMapRootIndex; |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 2741 | case kExternalDoubleArray: |
| 2742 | return kExternalDoubleArrayMapRootIndex; |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2743 | case kExternalPixelArray: |
| 2744 | return kExternalPixelArrayMapRootIndex; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2745 | default: |
| 2746 | UNREACHABLE(); |
| 2747 | return kUndefinedValueRootIndex; |
| 2748 | } |
| 2749 | } |
| 2750 | |
| 2751 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2752 | MaybeObject* Heap::NumberFromDouble(double value, PretenureFlag pretenure) { |
kmillikin@chromium.org | 4111b80 | 2010-05-03 10:34:42 +0000 | [diff] [blame] | 2753 | // We need to distinguish the minus zero value and this cannot be |
| 2754 | // done after conversion to int. Doing this by comparing bit |
| 2755 | // patterns is faster than using fpclassify() et al. |
| 2756 | static const DoubleRepresentation minus_zero(-0.0); |
| 2757 | |
| 2758 | DoubleRepresentation rep(value); |
| 2759 | if (rep.bits == minus_zero.bits) { |
| 2760 | return AllocateHeapNumber(-0.0, pretenure); |
| 2761 | } |
| 2762 | |
| 2763 | int int_value = FastD2I(value); |
| 2764 | if (value == int_value && Smi::IsValid(int_value)) { |
| 2765 | return Smi::FromInt(int_value); |
| 2766 | } |
| 2767 | |
| 2768 | // Materialize the value in the heap. |
| 2769 | return AllocateHeapNumber(value, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2770 | } |
| 2771 | |
| 2772 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2773 | MaybeObject* Heap::AllocateForeign(Address address, PretenureFlag pretenure) { |
| 2774 | // Statically ensure that it is safe to allocate foreigns in paged spaces. |
| 2775 | STATIC_ASSERT(Foreign::kSize <= Page::kMaxHeapObjectSize); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2776 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 2777 | Foreign* result; |
| 2778 | MaybeObject* maybe_result = Allocate(foreign_map(), space); |
| 2779 | if (!maybe_result->To(&result)) return maybe_result; |
| 2780 | result->set_foreign_address(address); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2781 | return result; |
| 2782 | } |
| 2783 | |
| 2784 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2785 | MaybeObject* Heap::AllocateSharedFunctionInfo(Object* name) { |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2786 | SharedFunctionInfo* share; |
| 2787 | MaybeObject* maybe = Allocate(shared_function_info_map(), OLD_POINTER_SPACE); |
| 2788 | if (!maybe->To<SharedFunctionInfo>(&share)) return maybe; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2789 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2790 | // Set pointer fields. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2791 | share->set_name(name); |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 2792 | Code* illegal = isolate_->builtins()->builtin(Builtins::kIllegal); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2793 | share->set_code(illegal); |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 2794 | share->set_scope_info(ScopeInfo::Empty()); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2795 | Code* construct_stub = |
| 2796 | isolate_->builtins()->builtin(Builtins::kJSConstructStubGeneric); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2797 | share->set_construct_stub(construct_stub); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2798 | share->set_instance_class_name(Object_symbol()); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 2799 | share->set_function_data(undefined_value(), SKIP_WRITE_BARRIER); |
| 2800 | share->set_script(undefined_value(), SKIP_WRITE_BARRIER); |
| 2801 | share->set_debug_info(undefined_value(), SKIP_WRITE_BARRIER); |
| 2802 | share->set_inferred_name(empty_string(), SKIP_WRITE_BARRIER); |
| 2803 | share->set_initial_map(undefined_value(), SKIP_WRITE_BARRIER); |
| 2804 | share->set_this_property_assignments(undefined_value(), SKIP_WRITE_BARRIER); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2805 | share->set_deopt_counter(Smi::FromInt(FLAG_deopt_every_n_times)); |
| 2806 | |
| 2807 | // Set integer fields (smi or int, depending on the architecture). |
| 2808 | share->set_length(0); |
| 2809 | share->set_formal_parameter_count(0); |
| 2810 | share->set_expected_nof_properties(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2811 | share->set_num_literals(0); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2812 | share->set_start_position_and_type(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2813 | share->set_end_position(0); |
| 2814 | share->set_function_token_position(0); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2815 | // All compiler hints default to false or 0. |
| 2816 | share->set_compiler_hints(0); |
| 2817 | share->set_this_property_assignments_count(0); |
| 2818 | share->set_opt_count(0); |
| 2819 | |
| 2820 | return share; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2821 | } |
| 2822 | |
| 2823 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2824 | MaybeObject* Heap::AllocateJSMessageObject(String* type, |
| 2825 | JSArray* arguments, |
| 2826 | int start_position, |
| 2827 | int end_position, |
| 2828 | Object* script, |
| 2829 | Object* stack_trace, |
| 2830 | Object* stack_frames) { |
| 2831 | Object* result; |
| 2832 | { MaybeObject* maybe_result = Allocate(message_object_map(), NEW_SPACE); |
| 2833 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2834 | } |
| 2835 | JSMessageObject* message = JSMessageObject::cast(result); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 2836 | message->set_properties(Heap::empty_fixed_array(), SKIP_WRITE_BARRIER); |
| 2837 | message->set_elements(Heap::empty_fixed_array(), SKIP_WRITE_BARRIER); |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2838 | message->set_type(type); |
| 2839 | message->set_arguments(arguments); |
| 2840 | message->set_start_position(start_position); |
| 2841 | message->set_end_position(end_position); |
| 2842 | message->set_script(script); |
| 2843 | message->set_stack_trace(stack_trace); |
| 2844 | message->set_stack_frames(stack_frames); |
| 2845 | return result; |
| 2846 | } |
| 2847 | |
| 2848 | |
| 2849 | |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2850 | // Returns true for a character in a range. Both limits are inclusive. |
| 2851 | static inline bool Between(uint32_t character, uint32_t from, uint32_t to) { |
| 2852 | // This makes uses of the the unsigned wraparound. |
| 2853 | return character - from <= to - from; |
| 2854 | } |
| 2855 | |
| 2856 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2857 | MUST_USE_RESULT static inline MaybeObject* MakeOrFindTwoCharacterString( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2858 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2859 | uint32_t c1, |
| 2860 | uint32_t c2) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2861 | String* symbol; |
| 2862 | // Numeric strings have a different hash algorithm not known by |
| 2863 | // LookupTwoCharsSymbolIfExists, so we skip this step for such strings. |
| 2864 | if ((!Between(c1, '0', '9') || !Between(c2, '0', '9')) && |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2865 | heap->symbol_table()->LookupTwoCharsSymbolIfExists(c1, c2, &symbol)) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2866 | return symbol; |
| 2867 | // Now we know the length is 2, we might as well make use of that fact |
| 2868 | // when building the new string. |
| 2869 | } else if ((c1 | c2) <= String::kMaxAsciiCharCodeU) { // We can do this |
| 2870 | ASSERT(IsPowerOf2(String::kMaxAsciiCharCodeU + 1)); // because of this. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2871 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2872 | { MaybeObject* maybe_result = heap->AllocateRawAsciiString(2); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2873 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2874 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2875 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2876 | dest[0] = c1; |
| 2877 | dest[1] = c2; |
| 2878 | return result; |
| 2879 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2880 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2881 | { MaybeObject* maybe_result = heap->AllocateRawTwoByteString(2); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2882 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2883 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2884 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
| 2885 | dest[0] = c1; |
| 2886 | dest[1] = c2; |
| 2887 | return result; |
| 2888 | } |
| 2889 | } |
| 2890 | |
| 2891 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2892 | MaybeObject* Heap::AllocateConsString(String* first, String* second) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2893 | int first_length = first->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2894 | if (first_length == 0) { |
| 2895 | return second; |
| 2896 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2897 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2898 | int second_length = second->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2899 | if (second_length == 0) { |
| 2900 | return first; |
| 2901 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2902 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2903 | int length = first_length + second_length; |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2904 | |
| 2905 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2906 | // dictionary. Check whether we already have the string in the symbol |
| 2907 | // table to prevent creation of many unneccesary strings. |
| 2908 | if (length == 2) { |
| 2909 | unsigned c1 = first->Get(0); |
| 2910 | unsigned c2 = second->Get(0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2911 | return MakeOrFindTwoCharacterString(this, c1, c2); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2912 | } |
| 2913 | |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2914 | bool first_is_ascii = first->IsAsciiRepresentation(); |
| 2915 | bool second_is_ascii = second->IsAsciiRepresentation(); |
| 2916 | bool is_ascii = first_is_ascii && second_is_ascii; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2917 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2918 | // Make sure that an out of memory exception is thrown if the length |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 2919 | // of the new cons string is too large. |
| 2920 | if (length > String::kMaxLength || length < 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2921 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2922 | return Failure::OutOfMemoryException(); |
| 2923 | } |
| 2924 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2925 | bool is_ascii_data_in_two_byte_string = false; |
| 2926 | if (!is_ascii) { |
| 2927 | // At least one of the strings uses two-byte representation so we |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 2928 | // can't use the fast case code for short ASCII strings below, but |
| 2929 | // we can try to save memory if all chars actually fit in ASCII. |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2930 | is_ascii_data_in_two_byte_string = |
| 2931 | first->HasOnlyAsciiChars() && second->HasOnlyAsciiChars(); |
| 2932 | if (is_ascii_data_in_two_byte_string) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2933 | isolate_->counters()->string_add_runtime_ext_to_ascii()->Increment(); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2934 | } |
| 2935 | } |
| 2936 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2937 | // If the resulting string is small make a flat string. |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 2938 | if (length < ConsString::kMinLength) { |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2939 | // Note that neither of the two inputs can be a slice because: |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 2940 | STATIC_ASSERT(ConsString::kMinLength <= SlicedString::kMinLength); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2941 | ASSERT(first->IsFlat()); |
| 2942 | ASSERT(second->IsFlat()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2943 | if (is_ascii) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2944 | Object* result; |
| 2945 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2946 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2947 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2948 | // Copy the characters into the new object. |
| 2949 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2950 | // Copy first part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2951 | const char* src; |
| 2952 | if (first->IsExternalString()) { |
erikcorry | 0ad885c | 2011-11-21 13:51:57 +0000 | [diff] [blame] | 2953 | src = ExternalAsciiString::cast(first)->GetChars(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2954 | } else { |
| 2955 | src = SeqAsciiString::cast(first)->GetChars(); |
| 2956 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2957 | for (int i = 0; i < first_length; i++) *dest++ = src[i]; |
| 2958 | // Copy second part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2959 | if (second->IsExternalString()) { |
erikcorry | 0ad885c | 2011-11-21 13:51:57 +0000 | [diff] [blame] | 2960 | src = ExternalAsciiString::cast(second)->GetChars(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2961 | } else { |
| 2962 | src = SeqAsciiString::cast(second)->GetChars(); |
| 2963 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2964 | for (int i = 0; i < second_length; i++) *dest++ = src[i]; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2965 | return result; |
| 2966 | } else { |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2967 | if (is_ascii_data_in_two_byte_string) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2968 | Object* result; |
| 2969 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2970 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2971 | } |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2972 | // Copy the characters into the new object. |
| 2973 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2974 | String::WriteToFlat(first, dest, 0, first_length); |
| 2975 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2976 | isolate_->counters()->string_add_runtime_ext_to_ascii()->Increment(); |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2977 | return result; |
| 2978 | } |
| 2979 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2980 | Object* result; |
| 2981 | { MaybeObject* maybe_result = AllocateRawTwoByteString(length); |
| 2982 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2983 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2984 | // Copy the characters into the new object. |
| 2985 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2986 | String::WriteToFlat(first, dest, 0, first_length); |
| 2987 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2988 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2989 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2990 | } |
| 2991 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2992 | Map* map = (is_ascii || is_ascii_data_in_two_byte_string) ? |
| 2993 | cons_ascii_string_map() : cons_string_map(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2994 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2995 | Object* result; |
| 2996 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2997 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2998 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2999 | |
| 3000 | AssertNoAllocation no_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3001 | ConsString* cons_string = ConsString::cast(result); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3002 | WriteBarrierMode mode = cons_string->GetWriteBarrierMode(no_gc); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3003 | cons_string->set_length(length); |
| 3004 | cons_string->set_hash_field(String::kEmptyHashField); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3005 | cons_string->set_first(first, mode); |
| 3006 | cons_string->set_second(second, mode); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3007 | return result; |
| 3008 | } |
| 3009 | |
| 3010 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3011 | MaybeObject* Heap::AllocateSubString(String* buffer, |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 3012 | int start, |
| 3013 | int end, |
| 3014 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3015 | int length = end - start; |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 3016 | if (length <= 0) { |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 3017 | return empty_string(); |
| 3018 | } else if (length == 1) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3019 | return LookupSingleCharacterStringFromCode(buffer->Get(start)); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 3020 | } else if (length == 2) { |
| 3021 | // Optimization for 2-byte strings often used as keys in a decompression |
| 3022 | // dictionary. Check whether we already have the string in the symbol |
| 3023 | // table to prevent creation of many unneccesary strings. |
| 3024 | unsigned c1 = buffer->Get(start); |
| 3025 | unsigned c2 = buffer->Get(start + 1); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3026 | return MakeOrFindTwoCharacterString(this, c1, c2); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3027 | } |
| 3028 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3029 | // Make an attempt to flatten the buffer to reduce access time. |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 3030 | buffer = buffer->TryFlattenGetString(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3031 | |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3032 | if (!FLAG_string_slices || |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3033 | !buffer->IsFlat() || |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3034 | length < SlicedString::kMinLength || |
| 3035 | pretenure == TENURED) { |
| 3036 | Object* result; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3037 | // WriteToFlat takes care of the case when an indirect string has a |
| 3038 | // different encoding from its underlying string. These encodings may |
| 3039 | // differ because of externalization. |
| 3040 | bool is_ascii = buffer->IsAsciiRepresentation(); |
| 3041 | { MaybeObject* maybe_result = is_ascii |
| 3042 | ? AllocateRawAsciiString(length, pretenure) |
| 3043 | : AllocateRawTwoByteString(length, pretenure); |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3044 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3045 | } |
| 3046 | String* string_result = String::cast(result); |
| 3047 | // Copy the characters into the new object. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3048 | if (is_ascii) { |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3049 | ASSERT(string_result->IsAsciiRepresentation()); |
| 3050 | char* dest = SeqAsciiString::cast(string_result)->GetChars(); |
| 3051 | String::WriteToFlat(buffer, dest, start, end); |
| 3052 | } else { |
| 3053 | ASSERT(string_result->IsTwoByteRepresentation()); |
| 3054 | uc16* dest = SeqTwoByteString::cast(string_result)->GetChars(); |
| 3055 | String::WriteToFlat(buffer, dest, start, end); |
| 3056 | } |
| 3057 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3058 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3059 | |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3060 | ASSERT(buffer->IsFlat()); |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3061 | #if DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3062 | if (FLAG_verify_heap) { |
| 3063 | buffer->StringVerify(); |
| 3064 | } |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3065 | #endif |
| 3066 | |
| 3067 | Object* result; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3068 | // When slicing an indirect string we use its encoding for a newly created |
| 3069 | // slice and don't check the encoding of the underlying string. This is safe |
| 3070 | // even if the encodings are different because of externalization. If an |
| 3071 | // indirect ASCII string is pointing to a two-byte string, the two-byte char |
| 3072 | // codes of the underlying string must still fit into ASCII (because |
| 3073 | // externalization must not change char codes). |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 3074 | { Map* map = buffer->IsAsciiRepresentation() |
| 3075 | ? sliced_ascii_string_map() |
| 3076 | : sliced_string_map(); |
| 3077 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3078 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3079 | } |
| 3080 | |
| 3081 | AssertNoAllocation no_gc; |
| 3082 | SlicedString* sliced_string = SlicedString::cast(result); |
| 3083 | sliced_string->set_length(length); |
| 3084 | sliced_string->set_hash_field(String::kEmptyHashField); |
| 3085 | if (buffer->IsConsString()) { |
| 3086 | ConsString* cons = ConsString::cast(buffer); |
| 3087 | ASSERT(cons->second()->length() == 0); |
| 3088 | sliced_string->set_parent(cons->first()); |
| 3089 | sliced_string->set_offset(start); |
| 3090 | } else if (buffer->IsSlicedString()) { |
| 3091 | // Prevent nesting sliced strings. |
| 3092 | SlicedString* parent_slice = SlicedString::cast(buffer); |
| 3093 | sliced_string->set_parent(parent_slice->parent()); |
| 3094 | sliced_string->set_offset(start + parent_slice->offset()); |
| 3095 | } else { |
| 3096 | sliced_string->set_parent(buffer); |
| 3097 | sliced_string->set_offset(start); |
| 3098 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3099 | ASSERT(sliced_string->parent()->IsSeqString() || |
| 3100 | sliced_string->parent()->IsExternalString()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3101 | return result; |
| 3102 | } |
| 3103 | |
| 3104 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3105 | MaybeObject* Heap::AllocateExternalStringFromAscii( |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3106 | const ExternalAsciiString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3107 | size_t length = resource->length(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3108 | if (length > static_cast<size_t>(String::kMaxLength)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3109 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3110 | return Failure::OutOfMemoryException(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3111 | } |
| 3112 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3113 | Map* map = external_ascii_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3114 | Object* result; |
| 3115 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3116 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3117 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3118 | |
| 3119 | ExternalAsciiString* external_string = ExternalAsciiString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3120 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3121 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3122 | external_string->set_resource(resource); |
| 3123 | |
| 3124 | return result; |
| 3125 | } |
| 3126 | |
| 3127 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3128 | MaybeObject* Heap::AllocateExternalStringFromTwoByte( |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3129 | const ExternalTwoByteString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3130 | size_t length = resource->length(); |
| 3131 | if (length > static_cast<size_t>(String::kMaxLength)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3132 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3133 | return Failure::OutOfMemoryException(); |
| 3134 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3135 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 3136 | // For small strings we check whether the resource contains only |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3137 | // ASCII characters. If yes, we use a different string map. |
| 3138 | static const size_t kAsciiCheckLengthLimit = 32; |
| 3139 | bool is_ascii = length <= kAsciiCheckLengthLimit && |
| 3140 | String::IsAscii(resource->data(), static_cast<int>(length)); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 3141 | Map* map = is_ascii ? |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3142 | external_string_with_ascii_data_map() : external_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3143 | Object* result; |
| 3144 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3145 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3146 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3147 | |
| 3148 | ExternalTwoByteString* external_string = ExternalTwoByteString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3149 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3150 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3151 | external_string->set_resource(resource); |
| 3152 | |
| 3153 | return result; |
| 3154 | } |
| 3155 | |
| 3156 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3157 | MaybeObject* Heap::LookupSingleCharacterStringFromCode(uint16_t code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3158 | if (code <= String::kMaxAsciiCharCode) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3159 | Object* value = single_character_string_cache()->get(code); |
| 3160 | if (value != undefined_value()) return value; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3161 | |
| 3162 | char buffer[1]; |
| 3163 | buffer[0] = static_cast<char>(code); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3164 | Object* result; |
| 3165 | MaybeObject* maybe_result = LookupSymbol(Vector<const char>(buffer, 1)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3166 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3167 | if (!maybe_result->ToObject(&result)) return maybe_result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3168 | single_character_string_cache()->set(code, result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3169 | return result; |
| 3170 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3171 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3172 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3173 | { MaybeObject* maybe_result = AllocateRawTwoByteString(1); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3174 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3175 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3176 | String* answer = String::cast(result); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3177 | answer->Set(0, code); |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3178 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3179 | } |
| 3180 | |
| 3181 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3182 | MaybeObject* Heap::AllocateByteArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3183 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 3184 | return Failure::OutOfMemoryException(); |
| 3185 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3186 | if (pretenure == NOT_TENURED) { |
| 3187 | return AllocateByteArray(length); |
| 3188 | } |
| 3189 | int size = ByteArray::SizeFor(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3190 | Object* result; |
| 3191 | { MaybeObject* maybe_result = (size <= MaxObjectSizeInPagedSpace()) |
| 3192 | ? old_data_space_->AllocateRaw(size) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3193 | : lo_space_->AllocateRaw(size, NOT_EXECUTABLE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3194 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3195 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3196 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3197 | reinterpret_cast<ByteArray*>(result)->set_map_no_write_barrier( |
| 3198 | byte_array_map()); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3199 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3200 | return result; |
| 3201 | } |
| 3202 | |
| 3203 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3204 | MaybeObject* Heap::AllocateByteArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3205 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 3206 | return Failure::OutOfMemoryException(); |
| 3207 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3208 | int size = ByteArray::SizeFor(length); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3209 | AllocationSpace space = |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3210 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3211 | Object* result; |
| 3212 | { MaybeObject* maybe_result = AllocateRaw(size, space, OLD_DATA_SPACE); |
| 3213 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3214 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3215 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3216 | reinterpret_cast<ByteArray*>(result)->set_map_no_write_barrier( |
| 3217 | byte_array_map()); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3218 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3219 | return result; |
| 3220 | } |
| 3221 | |
| 3222 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 3223 | void Heap::CreateFillerObjectAt(Address addr, int size) { |
| 3224 | if (size == 0) return; |
| 3225 | HeapObject* filler = HeapObject::FromAddress(addr); |
| 3226 | if (size == kPointerSize) { |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3227 | filler->set_map_no_write_barrier(one_pointer_filler_map()); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 3228 | } else if (size == 2 * kPointerSize) { |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3229 | filler->set_map_no_write_barrier(two_pointer_filler_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 3230 | } else { |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3231 | filler->set_map_no_write_barrier(free_space_map()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3232 | FreeSpace::cast(filler)->set_size(size); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 3233 | } |
| 3234 | } |
| 3235 | |
| 3236 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3237 | MaybeObject* Heap::AllocateExternalArray(int length, |
| 3238 | ExternalArrayType array_type, |
| 3239 | void* external_pointer, |
| 3240 | PretenureFlag pretenure) { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3241 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3242 | Object* result; |
| 3243 | { MaybeObject* maybe_result = AllocateRaw(ExternalArray::kAlignedSize, |
| 3244 | space, |
| 3245 | OLD_DATA_SPACE); |
| 3246 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3247 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3248 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3249 | reinterpret_cast<ExternalArray*>(result)->set_map_no_write_barrier( |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3250 | MapForExternalArrayType(array_type)); |
| 3251 | reinterpret_cast<ExternalArray*>(result)->set_length(length); |
| 3252 | reinterpret_cast<ExternalArray*>(result)->set_external_pointer( |
| 3253 | external_pointer); |
| 3254 | |
| 3255 | return result; |
| 3256 | } |
| 3257 | |
| 3258 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3259 | MaybeObject* Heap::CreateCode(const CodeDesc& desc, |
| 3260 | Code::Flags flags, |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 3261 | Handle<Object> self_reference, |
| 3262 | bool immovable) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3263 | // Allocate ByteArray before the Code object, so that we do not risk |
| 3264 | // leaving uninitialized Code object (and breaking the heap). |
jkummerow@chromium.org | 04e4f1e | 2011-11-14 13:36:17 +0000 | [diff] [blame] | 3265 | ByteArray* reloc_info; |
| 3266 | MaybeObject* maybe_reloc_info = AllocateByteArray(desc.reloc_size, TENURED); |
| 3267 | if (!maybe_reloc_info->To(&reloc_info)) return maybe_reloc_info; |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3268 | |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 3269 | // Compute size. |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3270 | int body_size = RoundUp(desc.instr_size, kObjectAlignment); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3271 | int obj_size = Code::SizeFor(body_size); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3272 | ASSERT(IsAligned(static_cast<intptr_t>(obj_size), kCodeAlignment)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3273 | MaybeObject* maybe_result; |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 3274 | // Large code objects and code objects which should stay at a fixed address |
| 3275 | // are allocated in large object space. |
| 3276 | if (obj_size > MaxObjectSizeInPagedSpace() || immovable) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3277 | maybe_result = lo_space_->AllocateRaw(obj_size, EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3278 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3279 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3280 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3281 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3282 | Object* result; |
| 3283 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3284 | |
| 3285 | // Initialize the object |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3286 | HeapObject::cast(result)->set_map_no_write_barrier(code_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3287 | Code* code = Code::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3288 | ASSERT(!isolate_->code_range()->exists() || |
| 3289 | isolate_->code_range()->contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3290 | code->set_instruction_size(desc.instr_size); |
jkummerow@chromium.org | 04e4f1e | 2011-11-14 13:36:17 +0000 | [diff] [blame] | 3291 | code->set_relocation_info(reloc_info); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3292 | code->set_flags(flags); |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 3293 | if (code->is_call_stub() || code->is_keyed_call_stub()) { |
| 3294 | code->set_check_type(RECEIVER_MAP_CHECK); |
| 3295 | } |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 3296 | code->set_deoptimization_data(empty_fixed_array(), SKIP_WRITE_BARRIER); |
| 3297 | code->set_handler_table(empty_fixed_array(), SKIP_WRITE_BARRIER); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3298 | code->set_next_code_flushing_candidate(undefined_value()); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 3299 | // Allow self references to created code object by patching the handle to |
| 3300 | // point to the newly allocated Code object. |
| 3301 | if (!self_reference.is_null()) { |
| 3302 | *(self_reference.location()) = code; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3303 | } |
| 3304 | // Migrate generated code. |
| 3305 | // The generated code can contain Object** values (typically from handles) |
| 3306 | // that are dereferenced during the copy to point directly to the actual heap |
| 3307 | // objects. These pointers can include references to the code object itself, |
| 3308 | // through the self_reference parameter. |
| 3309 | code->CopyFrom(desc); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3310 | |
| 3311 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3312 | if (FLAG_verify_heap) { |
| 3313 | code->Verify(); |
| 3314 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3315 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3316 | return code; |
| 3317 | } |
| 3318 | |
| 3319 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3320 | MaybeObject* Heap::CopyCode(Code* code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3321 | // Allocate an object the same size as the code object. |
| 3322 | int obj_size = code->Size(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3323 | MaybeObject* maybe_result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3324 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3325 | maybe_result = lo_space_->AllocateRaw(obj_size, EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3326 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3327 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3328 | } |
| 3329 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3330 | Object* result; |
| 3331 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3332 | |
| 3333 | // Copy code object. |
| 3334 | Address old_addr = code->address(); |
| 3335 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3336 | CopyBlock(new_addr, old_addr, obj_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3337 | // Relocate the copy. |
| 3338 | Code* new_code = Code::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3339 | ASSERT(!isolate_->code_range()->exists() || |
| 3340 | isolate_->code_range()->contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3341 | new_code->Relocate(new_addr - old_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3342 | return new_code; |
| 3343 | } |
| 3344 | |
| 3345 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3346 | MaybeObject* Heap::CopyCode(Code* code, Vector<byte> reloc_info) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3347 | // Allocate ByteArray before the Code object, so that we do not risk |
| 3348 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3349 | Object* reloc_info_array; |
| 3350 | { MaybeObject* maybe_reloc_info_array = |
| 3351 | AllocateByteArray(reloc_info.length(), TENURED); |
| 3352 | if (!maybe_reloc_info_array->ToObject(&reloc_info_array)) { |
| 3353 | return maybe_reloc_info_array; |
| 3354 | } |
| 3355 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3356 | |
| 3357 | int new_body_size = RoundUp(code->instruction_size(), kObjectAlignment); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3358 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3359 | int new_obj_size = Code::SizeFor(new_body_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3360 | |
| 3361 | Address old_addr = code->address(); |
| 3362 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3363 | size_t relocation_offset = |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3364 | static_cast<size_t>(code->instruction_end() - old_addr); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3365 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3366 | MaybeObject* maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3367 | if (new_obj_size > MaxObjectSizeInPagedSpace()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3368 | maybe_result = lo_space_->AllocateRaw(new_obj_size, EXECUTABLE); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3369 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3370 | maybe_result = code_space_->AllocateRaw(new_obj_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3371 | } |
| 3372 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3373 | Object* result; |
| 3374 | if (!maybe_result->ToObject(&result)) return maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3375 | |
| 3376 | // Copy code object. |
| 3377 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
| 3378 | |
| 3379 | // Copy header and instructions. |
| 3380 | memcpy(new_addr, old_addr, relocation_offset); |
| 3381 | |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3382 | Code* new_code = Code::cast(result); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3383 | new_code->set_relocation_info(ByteArray::cast(reloc_info_array)); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3384 | |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3385 | // Copy patched rinfo. |
| 3386 | memcpy(new_code->relocation_start(), reloc_info.start(), reloc_info.length()); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3387 | |
| 3388 | // Relocate the copy. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3389 | ASSERT(!isolate_->code_range()->exists() || |
| 3390 | isolate_->code_range()->contains(code->address())); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3391 | new_code->Relocate(new_addr - old_addr); |
| 3392 | |
| 3393 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3394 | if (FLAG_verify_heap) { |
| 3395 | code->Verify(); |
| 3396 | } |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3397 | #endif |
| 3398 | return new_code; |
| 3399 | } |
| 3400 | |
| 3401 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3402 | MaybeObject* Heap::Allocate(Map* map, AllocationSpace space) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3403 | ASSERT(gc_state_ == NOT_IN_GC); |
| 3404 | ASSERT(map->instance_type() != MAP_TYPE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3405 | // If allocation failures are disallowed, we may allocate in a different |
| 3406 | // space when new space is full and the object is not a large object. |
| 3407 | AllocationSpace retry_space = |
| 3408 | (space != NEW_SPACE) ? space : TargetSpaceId(map->instance_type()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3409 | Object* result; |
| 3410 | { MaybeObject* maybe_result = |
| 3411 | AllocateRaw(map->instance_size(), space, retry_space); |
| 3412 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3413 | } |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 3414 | // No need for write barrier since object is white and map is in old space. |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 3415 | HeapObject::cast(result)->set_map_no_write_barrier(map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3416 | return result; |
| 3417 | } |
| 3418 | |
| 3419 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3420 | void Heap::InitializeFunction(JSFunction* function, |
| 3421 | SharedFunctionInfo* shared, |
| 3422 | Object* prototype) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3423 | ASSERT(!prototype->IsMap()); |
| 3424 | function->initialize_properties(); |
| 3425 | function->initialize_elements(); |
| 3426 | function->set_shared(shared); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 3427 | function->set_code(shared->code()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3428 | function->set_prototype_or_initial_map(prototype); |
| 3429 | function->set_context(undefined_value()); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3430 | function->set_literals_or_bindings(empty_fixed_array()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 3431 | function->set_next_function_link(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3432 | } |
| 3433 | |
| 3434 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3435 | MaybeObject* Heap::AllocateFunctionPrototype(JSFunction* function) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3436 | // Allocate the prototype. Make sure to use the object function |
| 3437 | // from the function's context, since the function can be from a |
| 3438 | // different context. |
| 3439 | JSFunction* object_function = |
| 3440 | function->context()->global_context()->object_function(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3441 | |
| 3442 | // Each function prototype gets a copy of the object function map. |
| 3443 | // This avoid unwanted sharing of maps between prototypes of different |
| 3444 | // constructors. |
| 3445 | Map* new_map; |
| 3446 | ASSERT(object_function->has_initial_map()); |
| 3447 | { MaybeObject* maybe_map = |
| 3448 | object_function->initial_map()->CopyDropTransitions(); |
| 3449 | if (!maybe_map->To<Map>(&new_map)) return maybe_map; |
| 3450 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3451 | Object* prototype; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3452 | { MaybeObject* maybe_prototype = AllocateJSObjectFromMap(new_map); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3453 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3454 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3455 | // When creating the prototype for the function we must set its |
| 3456 | // constructor to the function. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3457 | Object* result; |
| 3458 | { MaybeObject* maybe_result = |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 3459 | JSObject::cast(prototype)->SetLocalPropertyIgnoreAttributes( |
| 3460 | constructor_symbol(), function, DONT_ENUM); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3461 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3462 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3463 | return prototype; |
| 3464 | } |
| 3465 | |
| 3466 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3467 | MaybeObject* Heap::AllocateFunction(Map* function_map, |
| 3468 | SharedFunctionInfo* shared, |
| 3469 | Object* prototype, |
| 3470 | PretenureFlag pretenure) { |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3471 | AllocationSpace space = |
| 3472 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3473 | Object* result; |
| 3474 | { MaybeObject* maybe_result = Allocate(function_map, space); |
| 3475 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3476 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3477 | InitializeFunction(JSFunction::cast(result), shared, prototype); |
| 3478 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3479 | } |
| 3480 | |
| 3481 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3482 | MaybeObject* Heap::AllocateArgumentsObject(Object* callee, int length) { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 3483 | // To get fast allocation and map sharing for arguments objects we |
| 3484 | // allocate them based on an arguments boilerplate. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3485 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3486 | JSObject* boilerplate; |
| 3487 | int arguments_object_size; |
| 3488 | bool strict_mode_callee = callee->IsJSFunction() && |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 3489 | !JSFunction::cast(callee)->shared()->is_classic_mode(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3490 | if (strict_mode_callee) { |
| 3491 | boilerplate = |
| 3492 | isolate()->context()->global_context()-> |
| 3493 | strict_mode_arguments_boilerplate(); |
| 3494 | arguments_object_size = kArgumentsObjectSizeStrict; |
| 3495 | } else { |
| 3496 | boilerplate = |
| 3497 | isolate()->context()->global_context()->arguments_boilerplate(); |
| 3498 | arguments_object_size = kArgumentsObjectSize; |
| 3499 | } |
| 3500 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3501 | // This calls Copy directly rather than using Heap::AllocateRaw so we |
| 3502 | // duplicate the check here. |
| 3503 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 3504 | |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3505 | // Check that the size of the boilerplate matches our |
| 3506 | // expectations. The ArgumentsAccessStub::GenerateNewObject relies |
| 3507 | // on the size being a known constant. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3508 | ASSERT(arguments_object_size == boilerplate->map()->instance_size()); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3509 | |
| 3510 | // Do the allocation. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3511 | Object* result; |
| 3512 | { MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3513 | AllocateRaw(arguments_object_size, NEW_SPACE, OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3514 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3515 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3516 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3517 | // Copy the content. The arguments boilerplate doesn't have any |
| 3518 | // fields that point to new space so it's safe to skip the write |
| 3519 | // barrier here. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3520 | CopyBlock(HeapObject::cast(result)->address(), |
| 3521 | boilerplate->address(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3522 | JSObject::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3523 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3524 | // Set the length property. |
| 3525 | JSObject::cast(result)->InObjectPropertyAtPut(kArgumentsLengthIndex, |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3526 | Smi::FromInt(length), |
| 3527 | SKIP_WRITE_BARRIER); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3528 | // Set the callee property for non-strict mode arguments object only. |
| 3529 | if (!strict_mode_callee) { |
| 3530 | JSObject::cast(result)->InObjectPropertyAtPut(kArgumentsCalleeIndex, |
| 3531 | callee); |
| 3532 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3533 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3534 | // Check the state of the object |
| 3535 | ASSERT(JSObject::cast(result)->HasFastProperties()); |
| 3536 | ASSERT(JSObject::cast(result)->HasFastElements()); |
| 3537 | |
| 3538 | return result; |
| 3539 | } |
| 3540 | |
| 3541 | |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3542 | static bool HasDuplicates(DescriptorArray* descriptors) { |
| 3543 | int count = descriptors->number_of_descriptors(); |
| 3544 | if (count > 1) { |
| 3545 | String* prev_key = descriptors->GetKey(0); |
| 3546 | for (int i = 1; i != count; i++) { |
| 3547 | String* current_key = descriptors->GetKey(i); |
| 3548 | if (prev_key == current_key) return true; |
| 3549 | prev_key = current_key; |
| 3550 | } |
| 3551 | } |
| 3552 | return false; |
| 3553 | } |
| 3554 | |
| 3555 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3556 | MaybeObject* Heap::AllocateInitialMap(JSFunction* fun) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3557 | ASSERT(!fun->has_initial_map()); |
| 3558 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3559 | // First create a new map with the size and number of in-object properties |
| 3560 | // suggested by the function. |
| 3561 | int instance_size = fun->shared()->CalculateInstanceSize(); |
| 3562 | int in_object_properties = fun->shared()->CalculateInObjectProperties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3563 | Object* map_obj; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3564 | { MaybeObject* maybe_map_obj = AllocateMap(JS_OBJECT_TYPE, instance_size); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3565 | if (!maybe_map_obj->ToObject(&map_obj)) return maybe_map_obj; |
| 3566 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3567 | |
| 3568 | // Fetch or allocate prototype. |
| 3569 | Object* prototype; |
| 3570 | if (fun->has_instance_prototype()) { |
| 3571 | prototype = fun->instance_prototype(); |
| 3572 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3573 | { MaybeObject* maybe_prototype = AllocateFunctionPrototype(fun); |
| 3574 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3575 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3576 | } |
| 3577 | Map* map = Map::cast(map_obj); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3578 | map->set_inobject_properties(in_object_properties); |
| 3579 | map->set_unused_property_fields(in_object_properties); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3580 | map->set_prototype(prototype); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3581 | ASSERT(map->has_fast_elements()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3582 | |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3583 | // If the function has only simple this property assignments add |
| 3584 | // field descriptors for these to the initial map as the object |
| 3585 | // cannot be constructed without having these properties. Guard by |
| 3586 | // the inline_new flag so we only change the map if we generate a |
| 3587 | // specialized construct stub. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3588 | ASSERT(in_object_properties <= Map::kMaxPreAllocatedPropertyFields); |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3589 | if (fun->shared()->CanGenerateInlineConstructor(prototype)) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3590 | int count = fun->shared()->this_property_assignments_count(); |
| 3591 | if (count > in_object_properties) { |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3592 | // Inline constructor can only handle inobject properties. |
| 3593 | fun->shared()->ForbidInlineConstructor(); |
| 3594 | } else { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3595 | DescriptorArray* descriptors; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3596 | { MaybeObject* maybe_descriptors_obj = DescriptorArray::Allocate(count); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3597 | if (!maybe_descriptors_obj->To<DescriptorArray>(&descriptors)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3598 | return maybe_descriptors_obj; |
| 3599 | } |
| 3600 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3601 | DescriptorArray::WhitenessWitness witness(descriptors); |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3602 | for (int i = 0; i < count; i++) { |
| 3603 | String* name = fun->shared()->GetThisPropertyAssignmentName(i); |
| 3604 | ASSERT(name->IsSymbol()); |
| 3605 | FieldDescriptor field(name, i, NONE); |
| 3606 | field.SetEnumerationIndex(i); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3607 | descriptors->Set(i, &field, witness); |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3608 | } |
| 3609 | descriptors->SetNextEnumerationIndex(count); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3610 | descriptors->SortUnchecked(witness); |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3611 | |
| 3612 | // The descriptors may contain duplicates because the compiler does not |
| 3613 | // guarantee the uniqueness of property names (it would have required |
| 3614 | // quadratic time). Once the descriptors are sorted we can check for |
| 3615 | // duplicates in linear time. |
| 3616 | if (HasDuplicates(descriptors)) { |
| 3617 | fun->shared()->ForbidInlineConstructor(); |
| 3618 | } else { |
| 3619 | map->set_instance_descriptors(descriptors); |
| 3620 | map->set_pre_allocated_property_fields(count); |
| 3621 | map->set_unused_property_fields(in_object_properties - count); |
| 3622 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3623 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3624 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3625 | |
| 3626 | fun->shared()->StartInobjectSlackTracking(map); |
| 3627 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3628 | return map; |
| 3629 | } |
| 3630 | |
| 3631 | |
| 3632 | void Heap::InitializeJSObjectFromMap(JSObject* obj, |
| 3633 | FixedArray* properties, |
| 3634 | Map* map) { |
| 3635 | obj->set_properties(properties); |
| 3636 | obj->initialize_elements(); |
| 3637 | // TODO(1240798): Initialize the object's body using valid initial values |
| 3638 | // according to the object's initial map. For example, if the map's |
| 3639 | // instance type is JS_ARRAY_TYPE, the length field should be initialized |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 3640 | // to a number (e.g. Smi::FromInt(0)) and the elements initialized to a |
| 3641 | // fixed array (e.g. Heap::empty_fixed_array()). Currently, the object |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3642 | // verification code has to cope with (temporarily) invalid objects. See |
| 3643 | // for example, JSArray::JSArrayVerify). |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3644 | Object* filler; |
| 3645 | // We cannot always fill with one_pointer_filler_map because objects |
| 3646 | // created from API functions expect their internal fields to be initialized |
| 3647 | // with undefined_value. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3648 | // Pre-allocated fields need to be initialized with undefined_value as well |
| 3649 | // so that object accesses before the constructor completes (e.g. in the |
| 3650 | // debugger) will not cause a crash. |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3651 | if (map->constructor()->IsJSFunction() && |
| 3652 | JSFunction::cast(map->constructor())->shared()-> |
| 3653 | IsInobjectSlackTrackingInProgress()) { |
| 3654 | // We might want to shrink the object later. |
| 3655 | ASSERT(obj->GetInternalFieldCount() == 0); |
| 3656 | filler = Heap::one_pointer_filler_map(); |
| 3657 | } else { |
| 3658 | filler = Heap::undefined_value(); |
| 3659 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3660 | obj->InitializeBody(map, Heap::undefined_value(), filler); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3661 | } |
| 3662 | |
| 3663 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3664 | MaybeObject* Heap::AllocateJSObjectFromMap(Map* map, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3665 | // JSFunctions should be allocated using AllocateFunction to be |
| 3666 | // properly initialized. |
| 3667 | ASSERT(map->instance_type() != JS_FUNCTION_TYPE); |
| 3668 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3669 | // Both types of global objects should be allocated using |
| 3670 | // AllocateGlobalObject to be properly initialized. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3671 | ASSERT(map->instance_type() != JS_GLOBAL_OBJECT_TYPE); |
| 3672 | ASSERT(map->instance_type() != JS_BUILTINS_OBJECT_TYPE); |
| 3673 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3674 | // Allocate the backing storage for the properties. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3675 | int prop_size = |
| 3676 | map->pre_allocated_property_fields() + |
| 3677 | map->unused_property_fields() - |
| 3678 | map->inobject_properties(); |
| 3679 | ASSERT(prop_size >= 0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3680 | Object* properties; |
| 3681 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, pretenure); |
| 3682 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3683 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3684 | |
| 3685 | // Allocate the JSObject. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3686 | AllocationSpace space = |
| 3687 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3688 | if (map->instance_size() > MaxObjectSizeInPagedSpace()) space = LO_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3689 | Object* obj; |
| 3690 | { MaybeObject* maybe_obj = Allocate(map, space); |
| 3691 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3692 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3693 | |
| 3694 | // Initialize the JSObject. |
| 3695 | InitializeJSObjectFromMap(JSObject::cast(obj), |
| 3696 | FixedArray::cast(properties), |
| 3697 | map); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3698 | ASSERT(JSObject::cast(obj)->HasFastSmiOnlyElements() || |
| 3699 | JSObject::cast(obj)->HasFastElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3700 | return obj; |
| 3701 | } |
| 3702 | |
| 3703 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3704 | MaybeObject* Heap::AllocateJSObject(JSFunction* constructor, |
| 3705 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3706 | // Allocate the initial map if absent. |
| 3707 | if (!constructor->has_initial_map()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3708 | Object* initial_map; |
| 3709 | { MaybeObject* maybe_initial_map = AllocateInitialMap(constructor); |
| 3710 | if (!maybe_initial_map->ToObject(&initial_map)) return maybe_initial_map; |
| 3711 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3712 | constructor->set_initial_map(Map::cast(initial_map)); |
| 3713 | Map::cast(initial_map)->set_constructor(constructor); |
| 3714 | } |
| 3715 | // Allocate the object based on the constructors initial map. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3716 | MaybeObject* result = |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3717 | AllocateJSObjectFromMap(constructor->initial_map(), pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3718 | #ifdef DEBUG |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3719 | // Make sure result is NOT a global object if valid. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3720 | Object* non_failure; |
| 3721 | ASSERT(!result->ToObject(&non_failure) || !non_failure->IsGlobalObject()); |
| 3722 | #endif |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3723 | return result; |
| 3724 | } |
| 3725 | |
| 3726 | |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3727 | MaybeObject* Heap::AllocateJSProxy(Object* handler, Object* prototype) { |
| 3728 | // Allocate map. |
| 3729 | // TODO(rossberg): Once we optimize proxies, think about a scheme to share |
| 3730 | // maps. Will probably depend on the identity of the handler object, too. |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3731 | Map* map; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3732 | MaybeObject* maybe_map_obj = AllocateMap(JS_PROXY_TYPE, JSProxy::kSize); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3733 | if (!maybe_map_obj->To<Map>(&map)) return maybe_map_obj; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3734 | map->set_prototype(prototype); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3735 | |
| 3736 | // Allocate the proxy object. |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3737 | JSProxy* result; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3738 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3739 | if (!maybe_result->To<JSProxy>(&result)) return maybe_result; |
| 3740 | result->InitializeBody(map->instance_size(), Smi::FromInt(0)); |
| 3741 | result->set_handler(handler); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 3742 | result->set_hash(undefined_value(), SKIP_WRITE_BARRIER); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3743 | return result; |
| 3744 | } |
| 3745 | |
| 3746 | |
| 3747 | MaybeObject* Heap::AllocateJSFunctionProxy(Object* handler, |
| 3748 | Object* call_trap, |
| 3749 | Object* construct_trap, |
| 3750 | Object* prototype) { |
| 3751 | // Allocate map. |
| 3752 | // TODO(rossberg): Once we optimize proxies, think about a scheme to share |
| 3753 | // maps. Will probably depend on the identity of the handler object, too. |
| 3754 | Map* map; |
| 3755 | MaybeObject* maybe_map_obj = |
| 3756 | AllocateMap(JS_FUNCTION_PROXY_TYPE, JSFunctionProxy::kSize); |
| 3757 | if (!maybe_map_obj->To<Map>(&map)) return maybe_map_obj; |
| 3758 | map->set_prototype(prototype); |
| 3759 | |
| 3760 | // Allocate the proxy object. |
| 3761 | JSFunctionProxy* result; |
| 3762 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3763 | if (!maybe_result->To<JSFunctionProxy>(&result)) return maybe_result; |
| 3764 | result->InitializeBody(map->instance_size(), Smi::FromInt(0)); |
| 3765 | result->set_handler(handler); |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 3766 | result->set_hash(undefined_value(), SKIP_WRITE_BARRIER); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3767 | result->set_call_trap(call_trap); |
| 3768 | result->set_construct_trap(construct_trap); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3769 | return result; |
| 3770 | } |
| 3771 | |
| 3772 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3773 | MaybeObject* Heap::AllocateGlobalObject(JSFunction* constructor) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3774 | ASSERT(constructor->has_initial_map()); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3775 | Map* map = constructor->initial_map(); |
| 3776 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3777 | // Make sure no field properties are described in the initial map. |
| 3778 | // This guarantees us that normalizing the properties does not |
| 3779 | // require us to change property values to JSGlobalPropertyCells. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3780 | ASSERT(map->NextFreePropertyIndex() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3781 | |
| 3782 | // Make sure we don't have a ton of pre-allocated slots in the |
| 3783 | // global objects. They will be unused once we normalize the object. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3784 | ASSERT(map->unused_property_fields() == 0); |
| 3785 | ASSERT(map->inobject_properties() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3786 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3787 | // Initial size of the backing store to avoid resize of the storage during |
| 3788 | // bootstrapping. The size differs between the JS global object ad the |
| 3789 | // builtins object. |
| 3790 | int initial_size = map->instance_type() == JS_GLOBAL_OBJECT_TYPE ? 64 : 512; |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3791 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3792 | // Allocate a dictionary object for backing storage. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3793 | Object* obj; |
| 3794 | { MaybeObject* maybe_obj = |
| 3795 | StringDictionary::Allocate( |
| 3796 | map->NumberOfDescribedProperties() * 2 + initial_size); |
| 3797 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3798 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3799 | StringDictionary* dictionary = StringDictionary::cast(obj); |
| 3800 | |
| 3801 | // The global object might be created from an object template with accessors. |
| 3802 | // Fill these accessors into the dictionary. |
| 3803 | DescriptorArray* descs = map->instance_descriptors(); |
| 3804 | for (int i = 0; i < descs->number_of_descriptors(); i++) { |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 3805 | PropertyDetails details(descs->GetDetails(i)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3806 | ASSERT(details.type() == CALLBACKS); // Only accessors are expected. |
| 3807 | PropertyDetails d = |
| 3808 | PropertyDetails(details.attributes(), CALLBACKS, details.index()); |
| 3809 | Object* value = descs->GetCallbacksObject(i); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3810 | { MaybeObject* maybe_value = AllocateJSGlobalPropertyCell(value); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3811 | if (!maybe_value->ToObject(&value)) return maybe_value; |
| 3812 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3813 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3814 | Object* result; |
| 3815 | { MaybeObject* maybe_result = dictionary->Add(descs->GetKey(i), value, d); |
| 3816 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3817 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3818 | dictionary = StringDictionary::cast(result); |
| 3819 | } |
| 3820 | |
| 3821 | // Allocate the global object and initialize it with the backing store. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3822 | { MaybeObject* maybe_obj = Allocate(map, OLD_POINTER_SPACE); |
| 3823 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3824 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3825 | JSObject* global = JSObject::cast(obj); |
| 3826 | InitializeJSObjectFromMap(global, dictionary, map); |
| 3827 | |
| 3828 | // Create a new map for the global object. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3829 | { MaybeObject* maybe_obj = map->CopyDropDescriptors(); |
| 3830 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3831 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3832 | Map* new_map = Map::cast(obj); |
| 3833 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 3834 | // Set up the global object as a normalized object. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3835 | global->set_map(new_map); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3836 | global->map()->clear_instance_descriptors(); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3837 | global->set_properties(dictionary); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3838 | |
| 3839 | // Make sure result is a global object with properties in dictionary. |
| 3840 | ASSERT(global->IsGlobalObject()); |
| 3841 | ASSERT(!global->HasFastProperties()); |
| 3842 | return global; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3843 | } |
| 3844 | |
| 3845 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3846 | MaybeObject* Heap::CopyJSObject(JSObject* source) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3847 | // Never used to copy functions. If functions need to be copied we |
| 3848 | // have to be careful to clear the literals array. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3849 | SLOW_ASSERT(!source->IsJSFunction()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3850 | |
| 3851 | // Make the clone. |
| 3852 | Map* map = source->map(); |
| 3853 | int object_size = map->instance_size(); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3854 | Object* clone; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3855 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3856 | WriteBarrierMode wb_mode = UPDATE_WRITE_BARRIER; |
| 3857 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3858 | // If we're forced to always allocate, we use the general allocation |
| 3859 | // functions which may leave us with an object in old space. |
| 3860 | if (always_allocate()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3861 | { MaybeObject* maybe_clone = |
| 3862 | AllocateRaw(object_size, NEW_SPACE, OLD_POINTER_SPACE); |
| 3863 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3864 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3865 | Address clone_address = HeapObject::cast(clone)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3866 | CopyBlock(clone_address, |
| 3867 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3868 | object_size); |
| 3869 | // Update write barrier for all fields that lie beyond the header. |
vegorov@chromium.org | f837290 | 2010-03-15 10:26:20 +0000 | [diff] [blame] | 3870 | RecordWrites(clone_address, |
| 3871 | JSObject::kHeaderSize, |
antonm@chromium.org | 8e5e338 | 2010-03-24 09:56:30 +0000 | [diff] [blame] | 3872 | (object_size - JSObject::kHeaderSize) / kPointerSize); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3873 | } else { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3874 | wb_mode = SKIP_WRITE_BARRIER; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3875 | { MaybeObject* maybe_clone = new_space_.AllocateRaw(object_size); |
| 3876 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3877 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3878 | SLOW_ASSERT(InNewSpace(clone)); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3879 | // Since we know the clone is allocated in new space, we can copy |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3880 | // the contents without worrying about updating the write barrier. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3881 | CopyBlock(HeapObject::cast(clone)->address(), |
| 3882 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3883 | object_size); |
| 3884 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3885 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3886 | SLOW_ASSERT( |
| 3887 | JSObject::cast(clone)->GetElementsKind() == source->GetElementsKind()); |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3888 | FixedArrayBase* elements = FixedArrayBase::cast(source->elements()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3889 | FixedArray* properties = FixedArray::cast(source->properties()); |
| 3890 | // Update elements if necessary. |
ager@chromium.org | b26c50a | 2010-03-26 09:27:16 +0000 | [diff] [blame] | 3891 | if (elements->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3892 | Object* elem; |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3893 | { MaybeObject* maybe_elem; |
| 3894 | if (elements->map() == fixed_cow_array_map()) { |
| 3895 | maybe_elem = FixedArray::cast(elements); |
| 3896 | } else if (source->HasFastDoubleElements()) { |
| 3897 | maybe_elem = CopyFixedDoubleArray(FixedDoubleArray::cast(elements)); |
| 3898 | } else { |
| 3899 | maybe_elem = CopyFixedArray(FixedArray::cast(elements)); |
| 3900 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3901 | if (!maybe_elem->ToObject(&elem)) return maybe_elem; |
| 3902 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3903 | JSObject::cast(clone)->set_elements(FixedArrayBase::cast(elem), wb_mode); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3904 | } |
| 3905 | // Update properties if necessary. |
| 3906 | if (properties->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3907 | Object* prop; |
| 3908 | { MaybeObject* maybe_prop = CopyFixedArray(properties); |
| 3909 | if (!maybe_prop->ToObject(&prop)) return maybe_prop; |
| 3910 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 3911 | JSObject::cast(clone)->set_properties(FixedArray::cast(prop), wb_mode); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3912 | } |
| 3913 | // Return the new clone. |
| 3914 | return clone; |
| 3915 | } |
| 3916 | |
| 3917 | |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3918 | MaybeObject* Heap::ReinitializeJSReceiver( |
| 3919 | JSReceiver* object, InstanceType type, int size) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3920 | ASSERT(type >= FIRST_JS_OBJECT_TYPE); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3921 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3922 | // Allocate fresh map. |
| 3923 | // TODO(rossberg): Once we optimize proxies, cache these maps. |
| 3924 | Map* map; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3925 | MaybeObject* maybe = AllocateMap(type, size); |
| 3926 | if (!maybe->To<Map>(&map)) return maybe; |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3927 | |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3928 | // Check that the receiver has at least the size of the fresh object. |
| 3929 | int size_difference = object->map()->instance_size() - map->instance_size(); |
| 3930 | ASSERT(size_difference >= 0); |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3931 | |
| 3932 | map->set_prototype(object->map()->prototype()); |
| 3933 | |
| 3934 | // Allocate the backing storage for the properties. |
| 3935 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
| 3936 | Object* properties; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3937 | maybe = AllocateFixedArray(prop_size, TENURED); |
| 3938 | if (!maybe->ToObject(&properties)) return maybe; |
| 3939 | |
| 3940 | // Functions require some allocation, which might fail here. |
| 3941 | SharedFunctionInfo* shared = NULL; |
| 3942 | if (type == JS_FUNCTION_TYPE) { |
| 3943 | String* name; |
| 3944 | maybe = LookupAsciiSymbol("<freezing call trap>"); |
| 3945 | if (!maybe->To<String>(&name)) return maybe; |
| 3946 | maybe = AllocateSharedFunctionInfo(name); |
| 3947 | if (!maybe->To<SharedFunctionInfo>(&shared)) return maybe; |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3948 | } |
| 3949 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3950 | // Because of possible retries of this function after failure, |
| 3951 | // we must NOT fail after this point, where we have changed the type! |
| 3952 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3953 | // Reset the map for the object. |
| 3954 | object->set_map(map); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3955 | JSObject* jsobj = JSObject::cast(object); |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3956 | |
| 3957 | // Reinitialize the object from the constructor map. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3958 | InitializeJSObjectFromMap(jsobj, FixedArray::cast(properties), map); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3959 | |
| 3960 | // Functions require some minimal initialization. |
| 3961 | if (type == JS_FUNCTION_TYPE) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3962 | map->set_function_with_prototype(true); |
| 3963 | InitializeFunction(JSFunction::cast(object), shared, the_hole_value()); |
| 3964 | JSFunction::cast(object)->set_context( |
| 3965 | isolate()->context()->global_context()); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3966 | } |
| 3967 | |
| 3968 | // Put in filler if the new object is smaller than the old. |
| 3969 | if (size_difference > 0) { |
| 3970 | CreateFillerObjectAt( |
| 3971 | object->address() + map->instance_size(), size_difference); |
| 3972 | } |
| 3973 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3974 | return object; |
| 3975 | } |
| 3976 | |
| 3977 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3978 | MaybeObject* Heap::ReinitializeJSGlobalProxy(JSFunction* constructor, |
| 3979 | JSGlobalProxy* object) { |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3980 | ASSERT(constructor->has_initial_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3981 | Map* map = constructor->initial_map(); |
| 3982 | |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3983 | // Check that the already allocated object has the same size and type as |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3984 | // objects allocated using the constructor. |
| 3985 | ASSERT(map->instance_size() == object->map()->instance_size()); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3986 | ASSERT(map->instance_type() == object->map()->instance_type()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3987 | |
| 3988 | // Allocate the backing storage for the properties. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3989 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3990 | Object* properties; |
| 3991 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, TENURED); |
| 3992 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3993 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3994 | |
| 3995 | // Reset the map for the object. |
| 3996 | object->set_map(constructor->initial_map()); |
| 3997 | |
| 3998 | // Reinitialize the object from the constructor map. |
| 3999 | InitializeJSObjectFromMap(object, FixedArray::cast(properties), map); |
| 4000 | return object; |
| 4001 | } |
| 4002 | |
| 4003 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4004 | MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string, |
| 4005 | PretenureFlag pretenure) { |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 4006 | if (string.length() == 1) { |
| 4007 | return Heap::LookupSingleCharacterStringFromCode(string[0]); |
| 4008 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4009 | Object* result; |
| 4010 | { MaybeObject* maybe_result = |
| 4011 | AllocateRawAsciiString(string.length(), pretenure); |
| 4012 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4013 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4014 | |
| 4015 | // Copy the characters into the new object. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4016 | SeqAsciiString* string_result = SeqAsciiString::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4017 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4018 | string_result->SeqAsciiStringSet(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4019 | } |
| 4020 | return result; |
| 4021 | } |
| 4022 | |
| 4023 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4024 | MaybeObject* Heap::AllocateStringFromUtf8Slow(Vector<const char> string, |
| 4025 | PretenureFlag pretenure) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 4026 | // V8 only supports characters in the Basic Multilingual Plane. |
| 4027 | const uc32 kMaxSupportedChar = 0xFFFF; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4028 | // Count the number of characters in the UTF-8 string and check if |
| 4029 | // it is an ASCII string. |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 4030 | Access<UnicodeCache::Utf8Decoder> |
| 4031 | decoder(isolate_->unicode_cache()->utf8_decoder()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4032 | decoder->Reset(string.start(), string.length()); |
| 4033 | int chars = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4034 | while (decoder->has_more()) { |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4035 | decoder->GetNext(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4036 | chars++; |
| 4037 | } |
| 4038 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4039 | Object* result; |
| 4040 | { MaybeObject* maybe_result = AllocateRawTwoByteString(chars, pretenure); |
| 4041 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4042 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4043 | |
| 4044 | // Convert and copy the characters into the new object. |
| 4045 | String* string_result = String::cast(result); |
| 4046 | decoder->Reset(string.start(), string.length()); |
| 4047 | for (int i = 0; i < chars; i++) { |
| 4048 | uc32 r = decoder->GetNext(); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 4049 | if (r > kMaxSupportedChar) { r = unibrow::Utf8::kBadChar; } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 4050 | string_result->Set(i, r); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4051 | } |
| 4052 | return result; |
| 4053 | } |
| 4054 | |
| 4055 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4056 | MaybeObject* Heap::AllocateStringFromTwoByte(Vector<const uc16> string, |
| 4057 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4058 | // Check if the string is an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4059 | MaybeObject* maybe_result; |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4060 | if (String::IsAscii(string.start(), string.length())) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4061 | maybe_result = AllocateRawAsciiString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4062 | } else { // It's not an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4063 | maybe_result = AllocateRawTwoByteString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4064 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4065 | Object* result; |
| 4066 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4067 | |
| 4068 | // Copy the characters into the new object, which may be either ASCII or |
| 4069 | // UTF-16. |
| 4070 | String* string_result = String::cast(result); |
| 4071 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 4072 | string_result->Set(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4073 | } |
| 4074 | return result; |
| 4075 | } |
| 4076 | |
| 4077 | |
| 4078 | Map* Heap::SymbolMapForString(String* string) { |
| 4079 | // If the string is in new space it cannot be used as a symbol. |
| 4080 | if (InNewSpace(string)) return NULL; |
| 4081 | |
| 4082 | // Find the corresponding symbol map for strings. |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 4083 | switch (string->map()->instance_type()) { |
| 4084 | case STRING_TYPE: return symbol_map(); |
| 4085 | case ASCII_STRING_TYPE: return ascii_symbol_map(); |
| 4086 | case CONS_STRING_TYPE: return cons_symbol_map(); |
| 4087 | case CONS_ASCII_STRING_TYPE: return cons_ascii_symbol_map(); |
| 4088 | case EXTERNAL_STRING_TYPE: return external_symbol_map(); |
| 4089 | case EXTERNAL_ASCII_STRING_TYPE: return external_ascii_symbol_map(); |
| 4090 | case EXTERNAL_STRING_WITH_ASCII_DATA_TYPE: |
| 4091 | return external_symbol_with_ascii_data_map(); |
| 4092 | case SHORT_EXTERNAL_STRING_TYPE: return short_external_symbol_map(); |
| 4093 | case SHORT_EXTERNAL_ASCII_STRING_TYPE: |
| 4094 | return short_external_ascii_symbol_map(); |
| 4095 | case SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE: |
| 4096 | return short_external_symbol_with_ascii_data_map(); |
| 4097 | default: return NULL; // No match found. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4098 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4099 | } |
| 4100 | |
| 4101 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4102 | MaybeObject* Heap::AllocateInternalSymbol(unibrow::CharacterStream* buffer, |
| 4103 | int chars, |
| 4104 | uint32_t hash_field) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4105 | ASSERT(chars >= 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4106 | // Ensure the chars matches the number of characters in the buffer. |
| 4107 | ASSERT(static_cast<unsigned>(chars) == buffer->Length()); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 4108 | // Determine whether the string is ASCII. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4109 | bool is_ascii = true; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4110 | while (buffer->has_more()) { |
| 4111 | if (buffer->GetNext() > unibrow::Utf8::kMaxOneByteChar) { |
| 4112 | is_ascii = false; |
| 4113 | break; |
| 4114 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4115 | } |
| 4116 | buffer->Rewind(); |
| 4117 | |
| 4118 | // Compute map and object size. |
| 4119 | int size; |
| 4120 | Map* map; |
| 4121 | |
| 4122 | if (is_ascii) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4123 | if (chars > SeqAsciiString::kMaxLength) { |
| 4124 | return Failure::OutOfMemoryException(); |
| 4125 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4126 | map = ascii_symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4127 | size = SeqAsciiString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4128 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4129 | if (chars > SeqTwoByteString::kMaxLength) { |
| 4130 | return Failure::OutOfMemoryException(); |
| 4131 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4132 | map = symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4133 | size = SeqTwoByteString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4134 | } |
| 4135 | |
| 4136 | // Allocate string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4137 | Object* result; |
| 4138 | { MaybeObject* maybe_result = (size > MaxObjectSizeInPagedSpace()) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4139 | ? lo_space_->AllocateRaw(size, NOT_EXECUTABLE) |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4140 | : old_data_space_->AllocateRaw(size); |
| 4141 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4142 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4143 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4144 | reinterpret_cast<HeapObject*>(result)->set_map_no_write_barrier(map); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4145 | // Set length and hash fields of the allocated string. |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 4146 | String* answer = String::cast(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4147 | answer->set_length(chars); |
| 4148 | answer->set_hash_field(hash_field); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4149 | |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 4150 | ASSERT_EQ(size, answer->Size()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4151 | |
| 4152 | // Fill in the characters. |
| 4153 | for (int i = 0; i < chars; i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 4154 | answer->Set(i, buffer->GetNext()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4155 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 4156 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4157 | } |
| 4158 | |
| 4159 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4160 | MaybeObject* Heap::AllocateRawAsciiString(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4161 | if (length < 0 || length > SeqAsciiString::kMaxLength) { |
| 4162 | return Failure::OutOfMemoryException(); |
| 4163 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4164 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4165 | int size = SeqAsciiString::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4166 | ASSERT(size <= SeqAsciiString::kMaxSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4167 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4168 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 4169 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 4170 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4171 | if (space == NEW_SPACE) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4172 | if (size > kMaxObjectSizeInNewSpace) { |
| 4173 | // Allocate in large object space, retry space will be ignored. |
| 4174 | space = LO_SPACE; |
| 4175 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 4176 | // Allocate in new space, retry in large object space. |
| 4177 | retry_space = LO_SPACE; |
| 4178 | } |
| 4179 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 4180 | space = LO_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4181 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4182 | Object* result; |
| 4183 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 4184 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4185 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4186 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4187 | // Partially initialize the object. |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4188 | HeapObject::cast(result)->set_map_no_write_barrier(ascii_string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4189 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4190 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4191 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 4192 | return result; |
| 4193 | } |
| 4194 | |
| 4195 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4196 | MaybeObject* Heap::AllocateRawTwoByteString(int length, |
| 4197 | PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4198 | if (length < 0 || length > SeqTwoByteString::kMaxLength) { |
| 4199 | return Failure::OutOfMemoryException(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4200 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4201 | int size = SeqTwoByteString::SizeFor(length); |
| 4202 | ASSERT(size <= SeqTwoByteString::kMaxSize); |
| 4203 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 4204 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 4205 | |
| 4206 | if (space == NEW_SPACE) { |
| 4207 | if (size > kMaxObjectSizeInNewSpace) { |
| 4208 | // Allocate in large object space, retry space will be ignored. |
| 4209 | space = LO_SPACE; |
| 4210 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 4211 | // Allocate in new space, retry in large object space. |
| 4212 | retry_space = LO_SPACE; |
| 4213 | } |
| 4214 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 4215 | space = LO_SPACE; |
| 4216 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4217 | Object* result; |
| 4218 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 4219 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4220 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4221 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4222 | // Partially initialize the object. |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4223 | HeapObject::cast(result)->set_map_no_write_barrier(string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4224 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4225 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4226 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 4227 | return result; |
| 4228 | } |
| 4229 | |
| 4230 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4231 | MaybeObject* Heap::AllocateEmptyFixedArray() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4232 | int size = FixedArray::SizeFor(0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4233 | Object* result; |
| 4234 | { MaybeObject* maybe_result = |
| 4235 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 4236 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4237 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4238 | // Initialize the object. |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4239 | reinterpret_cast<FixedArray*>(result)->set_map_no_write_barrier( |
| 4240 | fixed_array_map()); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4241 | reinterpret_cast<FixedArray*>(result)->set_length(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4242 | return result; |
| 4243 | } |
| 4244 | |
| 4245 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4246 | MaybeObject* Heap::AllocateRawFixedArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4247 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 4248 | return Failure::OutOfMemoryException(); |
| 4249 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 4250 | ASSERT(length > 0); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 4251 | // Use the general function if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4252 | if (always_allocate()) return AllocateFixedArray(length, TENURED); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4253 | // Allocate the raw data for a fixed array. |
| 4254 | int size = FixedArray::SizeFor(length); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4255 | return size <= kMaxObjectSizeInNewSpace |
| 4256 | ? new_space_.AllocateRaw(size) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4257 | : lo_space_->AllocateRaw(size, NOT_EXECUTABLE); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4258 | } |
| 4259 | |
| 4260 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4261 | MaybeObject* Heap::CopyFixedArrayWithMap(FixedArray* src, Map* map) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4262 | int len = src->length(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4263 | Object* obj; |
| 4264 | { MaybeObject* maybe_obj = AllocateRawFixedArray(len); |
| 4265 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4266 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4267 | if (InNewSpace(obj)) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4268 | HeapObject* dst = HeapObject::cast(obj); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4269 | dst->set_map_no_write_barrier(map); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 4270 | CopyBlock(dst->address() + kPointerSize, |
| 4271 | src->address() + kPointerSize, |
| 4272 | FixedArray::SizeFor(len) - kPointerSize); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4273 | return obj; |
| 4274 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4275 | HeapObject::cast(obj)->set_map_no_write_barrier(map); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4276 | FixedArray* result = FixedArray::cast(obj); |
| 4277 | result->set_length(len); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4278 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4279 | // Copy the content |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4280 | AssertNoAllocation no_gc; |
| 4281 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4282 | for (int i = 0; i < len; i++) result->set(i, src->get(i), mode); |
| 4283 | return result; |
| 4284 | } |
| 4285 | |
| 4286 | |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 4287 | MaybeObject* Heap::CopyFixedDoubleArrayWithMap(FixedDoubleArray* src, |
| 4288 | Map* map) { |
| 4289 | int len = src->length(); |
| 4290 | Object* obj; |
| 4291 | { MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(len, NOT_TENURED); |
| 4292 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4293 | } |
| 4294 | HeapObject* dst = HeapObject::cast(obj); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4295 | dst->set_map_no_write_barrier(map); |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 4296 | CopyBlock( |
| 4297 | dst->address() + FixedDoubleArray::kLengthOffset, |
| 4298 | src->address() + FixedDoubleArray::kLengthOffset, |
| 4299 | FixedDoubleArray::SizeFor(len) - FixedDoubleArray::kLengthOffset); |
| 4300 | return obj; |
| 4301 | } |
| 4302 | |
| 4303 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4304 | MaybeObject* Heap::AllocateFixedArray(int length) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 4305 | ASSERT(length >= 0); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 4306 | if (length == 0) return empty_fixed_array(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4307 | Object* result; |
| 4308 | { MaybeObject* maybe_result = AllocateRawFixedArray(length); |
| 4309 | if (!maybe_result->ToObject(&result)) return maybe_result; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4310 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4311 | // Initialize header. |
| 4312 | FixedArray* array = reinterpret_cast<FixedArray*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4313 | array->set_map_no_write_barrier(fixed_array_map()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4314 | array->set_length(length); |
| 4315 | // Initialize body. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4316 | ASSERT(!InNewSpace(undefined_value())); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4317 | MemsetPointer(array->data_start(), undefined_value(), length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4318 | return result; |
| 4319 | } |
| 4320 | |
| 4321 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4322 | MaybeObject* Heap::AllocateRawFixedArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4323 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 4324 | return Failure::OutOfMemoryException(); |
| 4325 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4326 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4327 | AllocationSpace space = |
| 4328 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4329 | int size = FixedArray::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4330 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 4331 | // Too big for new space. |
| 4332 | space = LO_SPACE; |
| 4333 | } else if (space == OLD_POINTER_SPACE && |
| 4334 | size > MaxObjectSizeInPagedSpace()) { |
| 4335 | // Too big for old pointer space. |
| 4336 | space = LO_SPACE; |
| 4337 | } |
| 4338 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4339 | AllocationSpace retry_space = |
| 4340 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_POINTER_SPACE : LO_SPACE; |
| 4341 | |
| 4342 | return AllocateRaw(size, space, retry_space); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4343 | } |
| 4344 | |
| 4345 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4346 | MUST_USE_RESULT static MaybeObject* AllocateFixedArrayWithFiller( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4347 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4348 | int length, |
| 4349 | PretenureFlag pretenure, |
| 4350 | Object* filler) { |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4351 | ASSERT(length >= 0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4352 | ASSERT(heap->empty_fixed_array()->IsFixedArray()); |
| 4353 | if (length == 0) return heap->empty_fixed_array(); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4354 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4355 | ASSERT(!heap->InNewSpace(filler)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4356 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4357 | { MaybeObject* maybe_result = heap->AllocateRawFixedArray(length, pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4358 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4359 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4360 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4361 | HeapObject::cast(result)->set_map_no_write_barrier(heap->fixed_array_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4362 | FixedArray* array = FixedArray::cast(result); |
| 4363 | array->set_length(length); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4364 | MemsetPointer(array->data_start(), filler, length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4365 | return array; |
| 4366 | } |
| 4367 | |
| 4368 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4369 | MaybeObject* Heap::AllocateFixedArray(int length, PretenureFlag pretenure) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4370 | return AllocateFixedArrayWithFiller(this, |
| 4371 | length, |
| 4372 | pretenure, |
| 4373 | undefined_value()); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4374 | } |
| 4375 | |
| 4376 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4377 | MaybeObject* Heap::AllocateFixedArrayWithHoles(int length, |
| 4378 | PretenureFlag pretenure) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4379 | return AllocateFixedArrayWithFiller(this, |
| 4380 | length, |
| 4381 | pretenure, |
| 4382 | the_hole_value()); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4383 | } |
| 4384 | |
| 4385 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4386 | MaybeObject* Heap::AllocateUninitializedFixedArray(int length) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4387 | if (length == 0) return empty_fixed_array(); |
| 4388 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4389 | Object* obj; |
| 4390 | { MaybeObject* maybe_obj = AllocateRawFixedArray(length); |
| 4391 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4392 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4393 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4394 | reinterpret_cast<FixedArray*>(obj)->set_map_no_write_barrier( |
| 4395 | fixed_array_map()); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4396 | FixedArray::cast(obj)->set_length(length); |
| 4397 | return obj; |
| 4398 | } |
| 4399 | |
| 4400 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4401 | MaybeObject* Heap::AllocateEmptyFixedDoubleArray() { |
| 4402 | int size = FixedDoubleArray::SizeFor(0); |
| 4403 | Object* result; |
| 4404 | { MaybeObject* maybe_result = |
| 4405 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 4406 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4407 | } |
| 4408 | // Initialize the object. |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4409 | reinterpret_cast<FixedDoubleArray*>(result)->set_map_no_write_barrier( |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4410 | fixed_double_array_map()); |
| 4411 | reinterpret_cast<FixedDoubleArray*>(result)->set_length(0); |
| 4412 | return result; |
| 4413 | } |
| 4414 | |
| 4415 | |
| 4416 | MaybeObject* Heap::AllocateUninitializedFixedDoubleArray( |
| 4417 | int length, |
| 4418 | PretenureFlag pretenure) { |
| 4419 | if (length == 0) return empty_fixed_double_array(); |
| 4420 | |
| 4421 | Object* obj; |
| 4422 | { MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(length, pretenure); |
| 4423 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4424 | } |
| 4425 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4426 | reinterpret_cast<FixedDoubleArray*>(obj)->set_map_no_write_barrier( |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 4427 | fixed_double_array_map()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4428 | FixedDoubleArray::cast(obj)->set_length(length); |
| 4429 | return obj; |
| 4430 | } |
| 4431 | |
| 4432 | |
| 4433 | MaybeObject* Heap::AllocateRawFixedDoubleArray(int length, |
| 4434 | PretenureFlag pretenure) { |
| 4435 | if (length < 0 || length > FixedDoubleArray::kMaxLength) { |
| 4436 | return Failure::OutOfMemoryException(); |
| 4437 | } |
| 4438 | |
| 4439 | AllocationSpace space = |
| 4440 | (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 4441 | int size = FixedDoubleArray::SizeFor(length); |
| 4442 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 4443 | // Too big for new space. |
| 4444 | space = LO_SPACE; |
| 4445 | } else if (space == OLD_DATA_SPACE && |
| 4446 | size > MaxObjectSizeInPagedSpace()) { |
| 4447 | // Too big for old data space. |
| 4448 | space = LO_SPACE; |
| 4449 | } |
| 4450 | |
| 4451 | AllocationSpace retry_space = |
| 4452 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_DATA_SPACE : LO_SPACE; |
| 4453 | |
| 4454 | return AllocateRaw(size, space, retry_space); |
| 4455 | } |
| 4456 | |
| 4457 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4458 | MaybeObject* Heap::AllocateHashTable(int length, PretenureFlag pretenure) { |
| 4459 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4460 | { MaybeObject* maybe_result = AllocateFixedArray(length, pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4461 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4462 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4463 | reinterpret_cast<HeapObject*>(result)->set_map_no_write_barrier( |
| 4464 | hash_table_map()); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 4465 | ASSERT(result->IsHashTable()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4466 | return result; |
| 4467 | } |
| 4468 | |
| 4469 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4470 | MaybeObject* Heap::AllocateGlobalContext() { |
| 4471 | Object* result; |
| 4472 | { MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4473 | AllocateFixedArray(Context::GLOBAL_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4474 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4475 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4476 | Context* context = reinterpret_cast<Context*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4477 | context->set_map_no_write_barrier(global_context_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4478 | ASSERT(context->IsGlobalContext()); |
| 4479 | ASSERT(result->IsContext()); |
| 4480 | return result; |
| 4481 | } |
| 4482 | |
| 4483 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4484 | MaybeObject* Heap::AllocateFunctionContext(int length, JSFunction* function) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4485 | ASSERT(length >= Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4486 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4487 | { MaybeObject* maybe_result = AllocateFixedArray(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4488 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4489 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4490 | Context* context = reinterpret_cast<Context*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4491 | context->set_map_no_write_barrier(function_context_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4492 | context->set_closure(function); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4493 | context->set_previous(function->context()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4494 | context->set_extension(NULL); |
| 4495 | context->set_global(function->context()->global()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4496 | return context; |
| 4497 | } |
| 4498 | |
| 4499 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4500 | MaybeObject* Heap::AllocateCatchContext(JSFunction* function, |
| 4501 | Context* previous, |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4502 | String* name, |
| 4503 | Object* thrown_object) { |
| 4504 | STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == Context::THROWN_OBJECT_INDEX); |
| 4505 | Object* result; |
| 4506 | { MaybeObject* maybe_result = |
| 4507 | AllocateFixedArray(Context::MIN_CONTEXT_SLOTS + 1); |
| 4508 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4509 | } |
| 4510 | Context* context = reinterpret_cast<Context*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4511 | context->set_map_no_write_barrier(catch_context_map()); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4512 | context->set_closure(function); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4513 | context->set_previous(previous); |
| 4514 | context->set_extension(name); |
| 4515 | context->set_global(previous->global()); |
| 4516 | context->set(Context::THROWN_OBJECT_INDEX, thrown_object); |
| 4517 | return context; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4518 | } |
| 4519 | |
| 4520 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4521 | MaybeObject* Heap::AllocateWithContext(JSFunction* function, |
| 4522 | Context* previous, |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4523 | JSObject* extension) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4524 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4525 | { MaybeObject* maybe_result = AllocateFixedArray(Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4526 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4527 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4528 | Context* context = reinterpret_cast<Context*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4529 | context->set_map_no_write_barrier(with_context_map()); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4530 | context->set_closure(function); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4531 | context->set_previous(previous); |
| 4532 | context->set_extension(extension); |
| 4533 | context->set_global(previous->global()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4534 | return context; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4535 | } |
| 4536 | |
| 4537 | |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4538 | MaybeObject* Heap::AllocateBlockContext(JSFunction* function, |
| 4539 | Context* previous, |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 4540 | ScopeInfo* scope_info) { |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4541 | Object* result; |
| 4542 | { MaybeObject* maybe_result = |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 4543 | AllocateFixedArrayWithHoles(scope_info->ContextLength()); |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4544 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4545 | } |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4546 | Context* context = reinterpret_cast<Context*>(result); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4547 | context->set_map_no_write_barrier(block_context_map()); |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4548 | context->set_closure(function); |
| 4549 | context->set_previous(previous); |
| 4550 | context->set_extension(scope_info); |
| 4551 | context->set_global(previous->global()); |
| 4552 | return context; |
| 4553 | } |
| 4554 | |
| 4555 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 4556 | MaybeObject* Heap::AllocateScopeInfo(int length) { |
| 4557 | FixedArray* scope_info; |
| 4558 | MaybeObject* maybe_scope_info = AllocateFixedArray(length, TENURED); |
| 4559 | if (!maybe_scope_info->To(&scope_info)) return maybe_scope_info; |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4560 | scope_info->set_map_no_write_barrier(scope_info_map()); |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4561 | return scope_info; |
| 4562 | } |
| 4563 | |
| 4564 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4565 | MaybeObject* Heap::AllocateStruct(InstanceType type) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4566 | Map* map; |
| 4567 | switch (type) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4568 | #define MAKE_CASE(NAME, Name, name) \ |
| 4569 | case NAME##_TYPE: map = name##_map(); break; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4570 | STRUCT_LIST(MAKE_CASE) |
| 4571 | #undef MAKE_CASE |
| 4572 | default: |
| 4573 | UNREACHABLE(); |
| 4574 | return Failure::InternalError(); |
| 4575 | } |
| 4576 | int size = map->instance_size(); |
| 4577 | AllocationSpace space = |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4578 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : OLD_POINTER_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4579 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4580 | { MaybeObject* maybe_result = Allocate(map, space); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4581 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4582 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4583 | Struct::cast(result)->InitializeBody(size); |
| 4584 | return result; |
| 4585 | } |
| 4586 | |
| 4587 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4588 | bool Heap::IsHeapIterable() { |
| 4589 | return (!old_pointer_space()->was_swept_conservatively() && |
| 4590 | !old_data_space()->was_swept_conservatively()); |
| 4591 | } |
| 4592 | |
| 4593 | |
| 4594 | void Heap::EnsureHeapIsIterable() { |
| 4595 | ASSERT(IsAllocationAllowed()); |
| 4596 | if (!IsHeapIterable()) { |
| 4597 | CollectAllGarbage(kMakeHeapIterableMask); |
| 4598 | } |
| 4599 | ASSERT(IsHeapIterable()); |
| 4600 | } |
| 4601 | |
| 4602 | |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 4603 | bool Heap::IdleNotification(int hint) { |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 4604 | if (hint >= 1000) return IdleGlobalGC(); |
| 4605 | if (contexts_disposed_ > 0 || !FLAG_incremental_marking || |
| 4606 | FLAG_expose_gc || Serializer::enabled()) { |
| 4607 | return true; |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 4608 | } |
| 4609 | |
| 4610 | // By doing small chunks of GC work in each IdleNotification, |
| 4611 | // perform a round of incremental GCs and after that wait until |
| 4612 | // the mutator creates enough garbage to justify a new round. |
| 4613 | // An incremental GC progresses as follows: |
| 4614 | // 1. many incremental marking steps, |
| 4615 | // 2. one old space mark-sweep-compact, |
| 4616 | // 3. many lazy sweep steps. |
| 4617 | // Use mark-sweep-compact events to count incremental GCs in a round. |
| 4618 | |
| 4619 | intptr_t size_factor = Min(Max(hint, 30), 1000) / 10; |
| 4620 | // The size factor is in range [3..100]. |
| 4621 | intptr_t step_size = size_factor * IncrementalMarking::kAllocatedThreshold; |
| 4622 | |
| 4623 | if (incremental_marking()->IsStopped()) { |
| 4624 | if (!IsSweepingComplete() && |
| 4625 | !AdvanceSweepers(static_cast<int>(step_size))) { |
| 4626 | return false; |
| 4627 | } |
| 4628 | } |
| 4629 | |
| 4630 | if (mark_sweeps_since_idle_round_started_ >= kMaxMarkSweepsInIdleRound) { |
| 4631 | if (EnoughGarbageSinceLastIdleRound()) { |
| 4632 | StartIdleRound(); |
| 4633 | } else { |
| 4634 | return true; |
| 4635 | } |
| 4636 | } |
| 4637 | |
| 4638 | int new_mark_sweeps = ms_count_ - ms_count_at_last_idle_notification_; |
| 4639 | mark_sweeps_since_idle_round_started_ += new_mark_sweeps; |
| 4640 | ms_count_at_last_idle_notification_ = ms_count_; |
| 4641 | |
| 4642 | if (mark_sweeps_since_idle_round_started_ >= kMaxMarkSweepsInIdleRound) { |
| 4643 | FinishIdleRound(); |
| 4644 | return true; |
| 4645 | } |
| 4646 | |
| 4647 | if (incremental_marking()->IsStopped()) { |
| 4648 | if (hint < 1000 && !WorthStartingGCWhenIdle()) { |
| 4649 | FinishIdleRound(); |
| 4650 | return true; |
| 4651 | } |
| 4652 | incremental_marking()->Start(); |
| 4653 | } |
| 4654 | |
| 4655 | // This flag prevents incremental marking from requesting GC via stack guard |
| 4656 | idle_notification_will_schedule_next_gc_ = true; |
| 4657 | incremental_marking()->Step(step_size); |
| 4658 | idle_notification_will_schedule_next_gc_ = false; |
| 4659 | |
| 4660 | if (incremental_marking()->IsComplete()) { |
| 4661 | bool uncommit = false; |
| 4662 | if (gc_count_at_last_idle_gc_ == gc_count_) { |
| 4663 | // No GC since the last full GC, the mutator is probably not active. |
| 4664 | isolate_->compilation_cache()->Clear(); |
| 4665 | uncommit = true; |
| 4666 | } |
| 4667 | CollectAllGarbage(kNoGCFlags); |
| 4668 | gc_count_at_last_idle_gc_ = gc_count_; |
| 4669 | if (uncommit) { |
| 4670 | new_space_.Shrink(); |
| 4671 | UncommitFromSpace(); |
| 4672 | } |
| 4673 | } |
| 4674 | return false; |
| 4675 | } |
| 4676 | |
| 4677 | |
| 4678 | bool Heap::IdleGlobalGC() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4679 | static const int kIdlesBeforeScavenge = 4; |
| 4680 | static const int kIdlesBeforeMarkSweep = 7; |
| 4681 | static const int kIdlesBeforeMarkCompact = 8; |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4682 | static const int kMaxIdleCount = kIdlesBeforeMarkCompact + 1; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 4683 | static const unsigned int kGCsBetweenCleanup = 4; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4684 | |
| 4685 | if (!last_idle_notification_gc_count_init_) { |
| 4686 | last_idle_notification_gc_count_ = gc_count_; |
| 4687 | last_idle_notification_gc_count_init_ = true; |
| 4688 | } |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4689 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4690 | bool uncommit = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4691 | bool finished = false; |
| 4692 | |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4693 | // Reset the number of idle notifications received when a number of |
| 4694 | // GCs have taken place. This allows another round of cleanup based |
| 4695 | // on idle notifications if enough work has been carried out to |
| 4696 | // provoke a number of garbage collections. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4697 | if (gc_count_ - last_idle_notification_gc_count_ < kGCsBetweenCleanup) { |
| 4698 | number_idle_notifications_ = |
| 4699 | Min(number_idle_notifications_ + 1, kMaxIdleCount); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4700 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4701 | number_idle_notifications_ = 0; |
| 4702 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4703 | } |
| 4704 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4705 | if (number_idle_notifications_ == kIdlesBeforeScavenge) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4706 | if (contexts_disposed_ > 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4707 | HistogramTimerScope scope(isolate_->counters()->gc_context()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4708 | CollectAllGarbage(kNoGCFlags); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4709 | } else { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 4710 | CollectGarbage(NEW_SPACE); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4711 | } |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4712 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4713 | last_idle_notification_gc_count_ = gc_count_; |
| 4714 | } else if (number_idle_notifications_ == kIdlesBeforeMarkSweep) { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4715 | // Before doing the mark-sweep collections we clear the |
| 4716 | // compilation cache to avoid hanging on to source code and |
| 4717 | // generated code for cached functions. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4718 | isolate_->compilation_cache()->Clear(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4719 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4720 | CollectAllGarbage(kNoGCFlags); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4721 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4722 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4723 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4724 | } else if (number_idle_notifications_ == kIdlesBeforeMarkCompact) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4725 | CollectAllGarbage(kNoGCFlags); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4726 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4727 | last_idle_notification_gc_count_ = gc_count_; |
| 4728 | number_idle_notifications_ = 0; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4729 | finished = true; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4730 | } else if (contexts_disposed_ > 0) { |
| 4731 | if (FLAG_expose_gc) { |
| 4732 | contexts_disposed_ = 0; |
| 4733 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4734 | HistogramTimerScope scope(isolate_->counters()->gc_context()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4735 | CollectAllGarbage(kNoGCFlags); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4736 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4737 | } |
| 4738 | // If this is the first idle notification, we reset the |
| 4739 | // notification count to avoid letting idle notifications for |
| 4740 | // context disposal garbage collections start a potentially too |
| 4741 | // aggressive idle GC cycle. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4742 | if (number_idle_notifications_ <= 1) { |
| 4743 | number_idle_notifications_ = 0; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4744 | uncommit = false; |
| 4745 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4746 | } else if (number_idle_notifications_ > kIdlesBeforeMarkCompact) { |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4747 | // If we have received more than kIdlesBeforeMarkCompact idle |
| 4748 | // notifications we do not perform any cleanup because we don't |
| 4749 | // expect to gain much by doing so. |
| 4750 | finished = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4751 | } |
| 4752 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4753 | // Make sure that we have no pending context disposals and |
| 4754 | // conditionally uncommit from space. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4755 | // Take into account that we might have decided to delay full collection |
| 4756 | // because incremental marking is in progress. |
| 4757 | ASSERT((contexts_disposed_ == 0) || !incremental_marking()->IsStopped()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4758 | if (uncommit) UncommitFromSpace(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4759 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4760 | return finished; |
| 4761 | } |
| 4762 | |
| 4763 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4764 | #ifdef DEBUG |
| 4765 | |
| 4766 | void Heap::Print() { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 4767 | if (!HasBeenSetUp()) return; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4768 | isolate()->PrintStack(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4769 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4770 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4771 | space->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4772 | } |
| 4773 | |
| 4774 | |
| 4775 | void Heap::ReportCodeStatistics(const char* title) { |
| 4776 | PrintF(">>>>>> Code Stats (%s) >>>>>>\n", title); |
| 4777 | PagedSpace::ResetCodeStatistics(); |
| 4778 | // We do not look for code in new space, map space, or old space. If code |
| 4779 | // somehow ends up in those spaces, we would miss it here. |
| 4780 | code_space_->CollectCodeStatistics(); |
| 4781 | lo_space_->CollectCodeStatistics(); |
| 4782 | PagedSpace::ReportCodeStatistics(); |
| 4783 | } |
| 4784 | |
| 4785 | |
| 4786 | // This function expects that NewSpace's allocated objects histogram is |
| 4787 | // populated (via a call to CollectStatistics or else as a side effect of a |
| 4788 | // just-completed scavenge collection). |
| 4789 | void Heap::ReportHeapStatistics(const char* title) { |
| 4790 | USE(title); |
| 4791 | PrintF(">>>>>> =============== %s (%d) =============== >>>>>>\n", |
| 4792 | title, gc_count_); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4793 | PrintF("old_gen_promotion_limit_ %" V8_PTR_PREFIX "d\n", |
| 4794 | old_gen_promotion_limit_); |
| 4795 | PrintF("old_gen_allocation_limit_ %" V8_PTR_PREFIX "d\n", |
| 4796 | old_gen_allocation_limit_); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4797 | PrintF("old_gen_limit_factor_ %d\n", old_gen_limit_factor_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4798 | |
| 4799 | PrintF("\n"); |
| 4800 | PrintF("Number of handles : %d\n", HandleScope::NumberOfHandles()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4801 | isolate_->global_handles()->PrintStats(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4802 | PrintF("\n"); |
| 4803 | |
| 4804 | PrintF("Heap statistics : "); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4805 | isolate_->memory_allocator()->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4806 | PrintF("To space : "); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4807 | new_space_.ReportStatistics(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4808 | PrintF("Old pointer space : "); |
| 4809 | old_pointer_space_->ReportStatistics(); |
| 4810 | PrintF("Old data space : "); |
| 4811 | old_data_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4812 | PrintF("Code space : "); |
| 4813 | code_space_->ReportStatistics(); |
| 4814 | PrintF("Map space : "); |
| 4815 | map_space_->ReportStatistics(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4816 | PrintF("Cell space : "); |
| 4817 | cell_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4818 | PrintF("Large object space : "); |
| 4819 | lo_space_->ReportStatistics(); |
| 4820 | PrintF(">>>>>> ========================================= >>>>>>\n"); |
| 4821 | } |
| 4822 | |
| 4823 | #endif // DEBUG |
| 4824 | |
| 4825 | bool Heap::Contains(HeapObject* value) { |
| 4826 | return Contains(value->address()); |
| 4827 | } |
| 4828 | |
| 4829 | |
| 4830 | bool Heap::Contains(Address addr) { |
| 4831 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 4832 | return HasBeenSetUp() && |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4833 | (new_space_.ToSpaceContains(addr) || |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4834 | old_pointer_space_->Contains(addr) || |
| 4835 | old_data_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4836 | code_space_->Contains(addr) || |
| 4837 | map_space_->Contains(addr) || |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4838 | cell_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4839 | lo_space_->SlowContains(addr)); |
| 4840 | } |
| 4841 | |
| 4842 | |
| 4843 | bool Heap::InSpace(HeapObject* value, AllocationSpace space) { |
| 4844 | return InSpace(value->address(), space); |
| 4845 | } |
| 4846 | |
| 4847 | |
| 4848 | bool Heap::InSpace(Address addr, AllocationSpace space) { |
| 4849 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 4850 | if (!HasBeenSetUp()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4851 | |
| 4852 | switch (space) { |
| 4853 | case NEW_SPACE: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4854 | return new_space_.ToSpaceContains(addr); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4855 | case OLD_POINTER_SPACE: |
| 4856 | return old_pointer_space_->Contains(addr); |
| 4857 | case OLD_DATA_SPACE: |
| 4858 | return old_data_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4859 | case CODE_SPACE: |
| 4860 | return code_space_->Contains(addr); |
| 4861 | case MAP_SPACE: |
| 4862 | return map_space_->Contains(addr); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4863 | case CELL_SPACE: |
| 4864 | return cell_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4865 | case LO_SPACE: |
| 4866 | return lo_space_->SlowContains(addr); |
| 4867 | } |
| 4868 | |
| 4869 | return false; |
| 4870 | } |
| 4871 | |
| 4872 | |
| 4873 | #ifdef DEBUG |
| 4874 | void Heap::Verify() { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 4875 | ASSERT(HasBeenSetUp()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4876 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4877 | store_buffer()->Verify(); |
| 4878 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4879 | VerifyPointersVisitor visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4880 | IterateRoots(&visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4881 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4882 | new_space_.Verify(); |
| 4883 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4884 | old_pointer_space_->Verify(&visitor); |
| 4885 | map_space_->Verify(&visitor); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4886 | |
| 4887 | VerifyPointersVisitor no_dirty_regions_visitor; |
| 4888 | old_data_space_->Verify(&no_dirty_regions_visitor); |
| 4889 | code_space_->Verify(&no_dirty_regions_visitor); |
| 4890 | cell_space_->Verify(&no_dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4891 | |
| 4892 | lo_space_->Verify(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4893 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4894 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4895 | #endif // DEBUG |
| 4896 | |
| 4897 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4898 | MaybeObject* Heap::LookupSymbol(Vector<const char> string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4899 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4900 | Object* new_table; |
| 4901 | { MaybeObject* maybe_new_table = |
| 4902 | symbol_table()->LookupSymbol(string, &symbol); |
| 4903 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4904 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4905 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4906 | // SymbolTable is a singleton and checks for identity. |
| 4907 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4908 | ASSERT(symbol != NULL); |
| 4909 | return symbol; |
| 4910 | } |
| 4911 | |
| 4912 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4913 | MaybeObject* Heap::LookupAsciiSymbol(Vector<const char> string) { |
| 4914 | Object* symbol = NULL; |
| 4915 | Object* new_table; |
| 4916 | { MaybeObject* maybe_new_table = |
| 4917 | symbol_table()->LookupAsciiSymbol(string, &symbol); |
| 4918 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4919 | } |
| 4920 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4921 | // SymbolTable is a singleton and checks for identity. |
| 4922 | roots_[kSymbolTableRootIndex] = new_table; |
| 4923 | ASSERT(symbol != NULL); |
| 4924 | return symbol; |
| 4925 | } |
| 4926 | |
| 4927 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 4928 | MaybeObject* Heap::LookupAsciiSymbol(Handle<SeqAsciiString> string, |
| 4929 | int from, |
| 4930 | int length) { |
| 4931 | Object* symbol = NULL; |
| 4932 | Object* new_table; |
| 4933 | { MaybeObject* maybe_new_table = |
| 4934 | symbol_table()->LookupSubStringAsciiSymbol(string, |
| 4935 | from, |
| 4936 | length, |
| 4937 | &symbol); |
| 4938 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4939 | } |
| 4940 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4941 | // SymbolTable is a singleton and checks for identity. |
| 4942 | roots_[kSymbolTableRootIndex] = new_table; |
| 4943 | ASSERT(symbol != NULL); |
| 4944 | return symbol; |
| 4945 | } |
| 4946 | |
| 4947 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4948 | MaybeObject* Heap::LookupTwoByteSymbol(Vector<const uc16> string) { |
| 4949 | Object* symbol = NULL; |
| 4950 | Object* new_table; |
| 4951 | { MaybeObject* maybe_new_table = |
| 4952 | symbol_table()->LookupTwoByteSymbol(string, &symbol); |
| 4953 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4954 | } |
| 4955 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4956 | // SymbolTable is a singleton and checks for identity. |
| 4957 | roots_[kSymbolTableRootIndex] = new_table; |
| 4958 | ASSERT(symbol != NULL); |
| 4959 | return symbol; |
| 4960 | } |
| 4961 | |
| 4962 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4963 | MaybeObject* Heap::LookupSymbol(String* string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4964 | if (string->IsSymbol()) return string; |
| 4965 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4966 | Object* new_table; |
| 4967 | { MaybeObject* maybe_new_table = |
| 4968 | symbol_table()->LookupString(string, &symbol); |
| 4969 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4970 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4971 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4972 | // SymbolTable is a singleton and checks for identity. |
| 4973 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4974 | ASSERT(symbol != NULL); |
| 4975 | return symbol; |
| 4976 | } |
| 4977 | |
| 4978 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4979 | bool Heap::LookupSymbolIfExists(String* string, String** symbol) { |
| 4980 | if (string->IsSymbol()) { |
| 4981 | *symbol = string; |
| 4982 | return true; |
| 4983 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4984 | return symbol_table()->LookupSymbolIfExists(string, symbol); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4985 | } |
| 4986 | |
| 4987 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4988 | #ifdef DEBUG |
| 4989 | void Heap::ZapFromSpace() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4990 | NewSpacePageIterator it(new_space_.FromSpaceStart(), |
| 4991 | new_space_.FromSpaceEnd()); |
| 4992 | while (it.has_next()) { |
| 4993 | NewSpacePage* page = it.next(); |
| 4994 | for (Address cursor = page->body(), limit = page->body_limit(); |
| 4995 | cursor < limit; |
| 4996 | cursor += kPointerSize) { |
| 4997 | Memory::Address_at(cursor) = kFromSpaceZapValue; |
| 4998 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4999 | } |
| 5000 | } |
| 5001 | #endif // DEBUG |
| 5002 | |
| 5003 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 5004 | void Heap::IterateAndMarkPointersToFromSpace(Address start, |
| 5005 | Address end, |
| 5006 | ObjectSlotCallback callback) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5007 | Address slot_address = start; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5008 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5009 | // We are not collecting slots on new space objects during mutation |
| 5010 | // thus we have to scan for pointers to evacuation candidates when we |
| 5011 | // promote objects. But we should not record any slots in non-black |
| 5012 | // objects. Grey object's slots would be rescanned. |
| 5013 | // White object might not survive until the end of collection |
| 5014 | // it would be a violation of the invariant to record it's slots. |
| 5015 | bool record_slots = false; |
| 5016 | if (incremental_marking()->IsCompacting()) { |
| 5017 | MarkBit mark_bit = Marking::MarkBitFrom(HeapObject::FromAddress(start)); |
| 5018 | record_slots = Marking::IsBlack(mark_bit); |
| 5019 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5020 | |
| 5021 | while (slot_address < end) { |
| 5022 | Object** slot = reinterpret_cast<Object**>(slot_address); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5023 | Object* object = *slot; |
| 5024 | // If the store buffer becomes overfull we mark pages as being exempt from |
| 5025 | // the store buffer. These pages are scanned to find pointers that point |
| 5026 | // to the new space. In that case we may hit newly promoted objects and |
| 5027 | // fix the pointers before the promotion queue gets to them. Thus the 'if'. |
| 5028 | if (object->IsHeapObject()) { |
| 5029 | if (Heap::InFromSpace(object)) { |
| 5030 | callback(reinterpret_cast<HeapObject**>(slot), |
| 5031 | HeapObject::cast(object)); |
| 5032 | Object* new_object = *slot; |
| 5033 | if (InNewSpace(new_object)) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 5034 | SLOW_ASSERT(Heap::InToSpace(new_object)); |
| 5035 | SLOW_ASSERT(new_object->IsHeapObject()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5036 | store_buffer_.EnterDirectlyIntoStoreBuffer( |
| 5037 | reinterpret_cast<Address>(slot)); |
| 5038 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 5039 | SLOW_ASSERT(!MarkCompactCollector::IsOnEvacuationCandidate(new_object)); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5040 | } else if (record_slots && |
| 5041 | MarkCompactCollector::IsOnEvacuationCandidate(object)) { |
| 5042 | mark_compact_collector()->RecordSlot(slot, slot, object); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5043 | } |
| 5044 | } |
| 5045 | slot_address += kPointerSize; |
| 5046 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5047 | } |
| 5048 | |
| 5049 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5050 | #ifdef DEBUG |
| 5051 | typedef bool (*CheckStoreBufferFilter)(Object** addr); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5052 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5053 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5054 | bool IsAMapPointerAddress(Object** addr) { |
| 5055 | uintptr_t a = reinterpret_cast<uintptr_t>(addr); |
| 5056 | int mod = a % Map::kSize; |
| 5057 | return mod >= Map::kPointerFieldsBeginOffset && |
| 5058 | mod < Map::kPointerFieldsEndOffset; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5059 | } |
| 5060 | |
| 5061 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5062 | bool EverythingsAPointer(Object** addr) { |
| 5063 | return true; |
| 5064 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 5065 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 5066 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5067 | static void CheckStoreBuffer(Heap* heap, |
| 5068 | Object** current, |
| 5069 | Object** limit, |
| 5070 | Object**** store_buffer_position, |
| 5071 | Object*** store_buffer_top, |
| 5072 | CheckStoreBufferFilter filter, |
| 5073 | Address special_garbage_start, |
| 5074 | Address special_garbage_end) { |
| 5075 | Map* free_space_map = heap->free_space_map(); |
| 5076 | for ( ; current < limit; current++) { |
| 5077 | Object* o = *current; |
| 5078 | Address current_address = reinterpret_cast<Address>(current); |
| 5079 | // Skip free space. |
| 5080 | if (o == free_space_map) { |
| 5081 | Address current_address = reinterpret_cast<Address>(current); |
| 5082 | FreeSpace* free_space = |
| 5083 | FreeSpace::cast(HeapObject::FromAddress(current_address)); |
| 5084 | int skip = free_space->Size(); |
| 5085 | ASSERT(current_address + skip <= reinterpret_cast<Address>(limit)); |
| 5086 | ASSERT(skip > 0); |
| 5087 | current_address += skip - kPointerSize; |
| 5088 | current = reinterpret_cast<Object**>(current_address); |
| 5089 | continue; |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 5090 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5091 | // Skip the current linear allocation space between top and limit which is |
| 5092 | // unmarked with the free space map, but can contain junk. |
| 5093 | if (current_address == special_garbage_start && |
| 5094 | special_garbage_end != special_garbage_start) { |
| 5095 | current_address = special_garbage_end - kPointerSize; |
| 5096 | current = reinterpret_cast<Object**>(current_address); |
| 5097 | continue; |
| 5098 | } |
| 5099 | if (!(*filter)(current)) continue; |
| 5100 | ASSERT(current_address < special_garbage_start || |
| 5101 | current_address >= special_garbage_end); |
| 5102 | ASSERT(reinterpret_cast<uintptr_t>(o) != kFreeListZapValue); |
| 5103 | // We have to check that the pointer does not point into new space |
| 5104 | // without trying to cast it to a heap object since the hash field of |
| 5105 | // a string can contain values like 1 and 3 which are tagged null |
| 5106 | // pointers. |
| 5107 | if (!heap->InNewSpace(o)) continue; |
| 5108 | while (**store_buffer_position < current && |
| 5109 | *store_buffer_position < store_buffer_top) { |
| 5110 | (*store_buffer_position)++; |
| 5111 | } |
| 5112 | if (**store_buffer_position != current || |
| 5113 | *store_buffer_position == store_buffer_top) { |
| 5114 | Object** obj_start = current; |
| 5115 | while (!(*obj_start)->IsMap()) obj_start--; |
| 5116 | UNREACHABLE(); |
| 5117 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5118 | } |
| 5119 | } |
| 5120 | |
| 5121 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5122 | // Check that the store buffer contains all intergenerational pointers by |
| 5123 | // scanning a page and ensuring that all pointers to young space are in the |
| 5124 | // store buffer. |
| 5125 | void Heap::OldPointerSpaceCheckStoreBuffer() { |
| 5126 | OldSpace* space = old_pointer_space(); |
| 5127 | PageIterator pages(space); |
| 5128 | |
| 5129 | store_buffer()->SortUniq(); |
| 5130 | |
| 5131 | while (pages.has_next()) { |
| 5132 | Page* page = pages.next(); |
| 5133 | Object** current = reinterpret_cast<Object**>(page->ObjectAreaStart()); |
| 5134 | |
| 5135 | Address end = page->ObjectAreaEnd(); |
| 5136 | |
| 5137 | Object*** store_buffer_position = store_buffer()->Start(); |
| 5138 | Object*** store_buffer_top = store_buffer()->Top(); |
| 5139 | |
| 5140 | Object** limit = reinterpret_cast<Object**>(end); |
| 5141 | CheckStoreBuffer(this, |
| 5142 | current, |
| 5143 | limit, |
| 5144 | &store_buffer_position, |
| 5145 | store_buffer_top, |
| 5146 | &EverythingsAPointer, |
| 5147 | space->top(), |
| 5148 | space->limit()); |
| 5149 | } |
| 5150 | } |
| 5151 | |
| 5152 | |
| 5153 | void Heap::MapSpaceCheckStoreBuffer() { |
| 5154 | MapSpace* space = map_space(); |
| 5155 | PageIterator pages(space); |
| 5156 | |
| 5157 | store_buffer()->SortUniq(); |
| 5158 | |
| 5159 | while (pages.has_next()) { |
| 5160 | Page* page = pages.next(); |
| 5161 | Object** current = reinterpret_cast<Object**>(page->ObjectAreaStart()); |
| 5162 | |
| 5163 | Address end = page->ObjectAreaEnd(); |
| 5164 | |
| 5165 | Object*** store_buffer_position = store_buffer()->Start(); |
| 5166 | Object*** store_buffer_top = store_buffer()->Top(); |
| 5167 | |
| 5168 | Object** limit = reinterpret_cast<Object**>(end); |
| 5169 | CheckStoreBuffer(this, |
| 5170 | current, |
| 5171 | limit, |
| 5172 | &store_buffer_position, |
| 5173 | store_buffer_top, |
| 5174 | &IsAMapPointerAddress, |
| 5175 | space->top(), |
| 5176 | space->limit()); |
| 5177 | } |
| 5178 | } |
| 5179 | |
| 5180 | |
| 5181 | void Heap::LargeObjectSpaceCheckStoreBuffer() { |
| 5182 | LargeObjectIterator it(lo_space()); |
| 5183 | for (HeapObject* object = it.Next(); object != NULL; object = it.Next()) { |
| 5184 | // We only have code, sequential strings, or fixed arrays in large |
| 5185 | // object space, and only fixed arrays can possibly contain pointers to |
| 5186 | // the young generation. |
| 5187 | if (object->IsFixedArray()) { |
| 5188 | Object*** store_buffer_position = store_buffer()->Start(); |
| 5189 | Object*** store_buffer_top = store_buffer()->Top(); |
| 5190 | Object** current = reinterpret_cast<Object**>(object->address()); |
| 5191 | Object** limit = |
| 5192 | reinterpret_cast<Object**>(object->address() + object->Size()); |
| 5193 | CheckStoreBuffer(this, |
| 5194 | current, |
| 5195 | limit, |
| 5196 | &store_buffer_position, |
| 5197 | store_buffer_top, |
| 5198 | &EverythingsAPointer, |
| 5199 | NULL, |
| 5200 | NULL); |
| 5201 | } |
| 5202 | } |
| 5203 | } |
| 5204 | #endif |
| 5205 | |
| 5206 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5207 | void Heap::IterateRoots(ObjectVisitor* v, VisitMode mode) { |
| 5208 | IterateStrongRoots(v, mode); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5209 | IterateWeakRoots(v, mode); |
| 5210 | } |
| 5211 | |
| 5212 | |
| 5213 | void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 5214 | v->VisitPointer(reinterpret_cast<Object**>(&roots_[kSymbolTableRootIndex])); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5215 | v->Synchronize(VisitorSynchronization::kSymbolTable); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 5216 | if (mode != VISIT_ALL_IN_SCAVENGE && |
| 5217 | mode != VISIT_ALL_IN_SWEEP_NEWSPACE) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5218 | // Scavenge collections have special processing for this. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5219 | external_string_table_.Iterate(v); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5220 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5221 | v->Synchronize(VisitorSynchronization::kExternalStringsTable); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5222 | } |
| 5223 | |
| 5224 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5225 | void Heap::IterateStrongRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 5226 | v->VisitPointers(&roots_[0], &roots_[kStrongRootListLength]); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5227 | v->Synchronize(VisitorSynchronization::kStrongRootList); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5228 | |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 5229 | v->VisitPointer(BitCast<Object**>(&hidden_symbol_)); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5230 | v->Synchronize(VisitorSynchronization::kSymbol); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5231 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5232 | isolate_->bootstrapper()->Iterate(v); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5233 | v->Synchronize(VisitorSynchronization::kBootstrapper); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5234 | isolate_->Iterate(v); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5235 | v->Synchronize(VisitorSynchronization::kTop); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5236 | Relocatable::Iterate(v); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5237 | v->Synchronize(VisitorSynchronization::kRelocatable); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 5238 | |
| 5239 | #ifdef ENABLE_DEBUGGER_SUPPORT |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5240 | isolate_->debug()->Iterate(v); |
ricow@chromium.org | 4f693d6 | 2011-07-04 14:01:31 +0000 | [diff] [blame] | 5241 | if (isolate_->deoptimizer_data() != NULL) { |
| 5242 | isolate_->deoptimizer_data()->Iterate(v); |
| 5243 | } |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 5244 | #endif |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5245 | v->Synchronize(VisitorSynchronization::kDebug); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5246 | isolate_->compilation_cache()->Iterate(v); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5247 | v->Synchronize(VisitorSynchronization::kCompilationCache); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5248 | |
| 5249 | // Iterate over local handles in handle scopes. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5250 | isolate_->handle_scope_implementer()->Iterate(v); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5251 | v->Synchronize(VisitorSynchronization::kHandleScope); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5252 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5253 | // Iterate over the builtin code objects and code stubs in the |
| 5254 | // heap. Note that it is not necessary to iterate over code objects |
| 5255 | // on scavenge collections. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5256 | if (mode != VISIT_ALL_IN_SCAVENGE) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5257 | isolate_->builtins()->IterateBuiltins(v); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5258 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5259 | v->Synchronize(VisitorSynchronization::kBuiltins); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5260 | |
| 5261 | // Iterate over global handles. |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 5262 | switch (mode) { |
| 5263 | case VISIT_ONLY_STRONG: |
| 5264 | isolate_->global_handles()->IterateStrongRoots(v); |
| 5265 | break; |
| 5266 | case VISIT_ALL_IN_SCAVENGE: |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 5267 | isolate_->global_handles()->IterateNewSpaceStrongAndDependentRoots(v); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 5268 | break; |
| 5269 | case VISIT_ALL_IN_SWEEP_NEWSPACE: |
| 5270 | case VISIT_ALL: |
| 5271 | isolate_->global_handles()->IterateAllRoots(v); |
| 5272 | break; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5273 | } |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5274 | v->Synchronize(VisitorSynchronization::kGlobalHandles); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5275 | |
| 5276 | // Iterate over pointers being held by inactive threads. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5277 | isolate_->thread_manager()->Iterate(v); |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5278 | v->Synchronize(VisitorSynchronization::kThreadManager); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5279 | |
| 5280 | // Iterate over the pointers the Serialization/Deserialization code is |
| 5281 | // holding. |
| 5282 | // During garbage collection this keeps the partial snapshot cache alive. |
| 5283 | // During deserialization of the startup snapshot this creates the partial |
| 5284 | // snapshot cache and deserializes the objects it refers to. During |
| 5285 | // serialization this does nothing, since the partial snapshot cache is |
| 5286 | // empty. However the next thing we do is create the partial snapshot, |
| 5287 | // filling up the partial snapshot cache with objects it needs as we go. |
| 5288 | SerializerDeserializer::Iterate(v); |
| 5289 | // We don't do a v->Synchronize call here, because in debug mode that will |
| 5290 | // output a flag to the snapshot. However at this point the serializer and |
| 5291 | // deserializer are deliberately a little unsynchronized (see above) so the |
| 5292 | // checking of the sync flag in the snapshot would fail. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5293 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5294 | |
| 5295 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5296 | // TODO(1236194): Since the heap size is configurable on the command line |
| 5297 | // and through the API, we should gracefully handle the case that the heap |
| 5298 | // size is not big enough to fit all the initial objects. |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 5299 | bool Heap::ConfigureHeap(int max_semispace_size, |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5300 | intptr_t max_old_gen_size, |
| 5301 | intptr_t max_executable_size) { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5302 | if (HasBeenSetUp()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5303 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5304 | if (max_semispace_size > 0) { |
| 5305 | if (max_semispace_size < Page::kPageSize) { |
| 5306 | max_semispace_size = Page::kPageSize; |
| 5307 | if (FLAG_trace_gc) { |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 5308 | PrintF("Max semispace size cannot be less than %dkbytes\n", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5309 | Page::kPageSize >> 10); |
| 5310 | } |
| 5311 | } |
| 5312 | max_semispace_size_ = max_semispace_size; |
| 5313 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5314 | |
| 5315 | if (Snapshot::IsEnabled()) { |
| 5316 | // If we are using a snapshot we always reserve the default amount |
| 5317 | // of memory for each semispace because code in the snapshot has |
| 5318 | // write-barrier code that relies on the size and alignment of new |
| 5319 | // space. We therefore cannot use a larger max semispace size |
| 5320 | // than the default reserved semispace size. |
| 5321 | if (max_semispace_size_ > reserved_semispace_size_) { |
| 5322 | max_semispace_size_ = reserved_semispace_size_; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5323 | if (FLAG_trace_gc) { |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 5324 | PrintF("Max semispace size cannot be more than %dkbytes\n", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5325 | reserved_semispace_size_ >> 10); |
| 5326 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5327 | } |
| 5328 | } else { |
| 5329 | // If we are not using snapshots we reserve space for the actual |
| 5330 | // max semispace size. |
| 5331 | reserved_semispace_size_ = max_semispace_size_; |
| 5332 | } |
| 5333 | |
| 5334 | if (max_old_gen_size > 0) max_old_generation_size_ = max_old_gen_size; |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 5335 | if (max_executable_size > 0) { |
| 5336 | max_executable_size_ = RoundUp(max_executable_size, Page::kPageSize); |
| 5337 | } |
| 5338 | |
| 5339 | // The max executable size must be less than or equal to the max old |
| 5340 | // generation size. |
| 5341 | if (max_executable_size_ > max_old_generation_size_) { |
| 5342 | max_executable_size_ = max_old_generation_size_; |
| 5343 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5344 | |
| 5345 | // The new space size must be a power of two to support single-bit testing |
| 5346 | // for containment. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5347 | max_semispace_size_ = RoundUpToPowerOf2(max_semispace_size_); |
| 5348 | reserved_semispace_size_ = RoundUpToPowerOf2(reserved_semispace_size_); |
| 5349 | initial_semispace_size_ = Min(initial_semispace_size_, max_semispace_size_); |
| 5350 | external_allocation_limit_ = 10 * max_semispace_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5351 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5352 | // The old generation is paged and needs at least one page for each space. |
| 5353 | int paged_space_count = LAST_PAGED_SPACE - FIRST_PAGED_SPACE + 1; |
| 5354 | max_old_generation_size_ = Max(static_cast<intptr_t>(paged_space_count * |
| 5355 | Page::kPageSize), |
| 5356 | RoundUp(max_old_generation_size_, |
| 5357 | Page::kPageSize)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5358 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5359 | configured_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5360 | return true; |
| 5361 | } |
| 5362 | |
| 5363 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5364 | bool Heap::ConfigureHeapDefault() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5365 | return ConfigureHeap(static_cast<intptr_t>(FLAG_max_new_space_size / 2) * KB, |
| 5366 | static_cast<intptr_t>(FLAG_max_old_space_size) * MB, |
| 5367 | static_cast<intptr_t>(FLAG_max_executable_size) * MB); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5368 | } |
| 5369 | |
| 5370 | |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5371 | void Heap::RecordStats(HeapStats* stats, bool take_snapshot) { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 5372 | *stats->start_marker = HeapStats::kStartMarker; |
| 5373 | *stats->end_marker = HeapStats::kEndMarker; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5374 | *stats->new_space_size = new_space_.SizeAsInt(); |
| 5375 | *stats->new_space_capacity = static_cast<int>(new_space_.Capacity()); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 5376 | *stats->old_pointer_space_size = old_pointer_space_->Size(); |
| 5377 | *stats->old_pointer_space_capacity = old_pointer_space_->Capacity(); |
| 5378 | *stats->old_data_space_size = old_data_space_->Size(); |
| 5379 | *stats->old_data_space_capacity = old_data_space_->Capacity(); |
| 5380 | *stats->code_space_size = code_space_->Size(); |
| 5381 | *stats->code_space_capacity = code_space_->Capacity(); |
| 5382 | *stats->map_space_size = map_space_->Size(); |
| 5383 | *stats->map_space_capacity = map_space_->Capacity(); |
| 5384 | *stats->cell_space_size = cell_space_->Size(); |
| 5385 | *stats->cell_space_capacity = cell_space_->Capacity(); |
| 5386 | *stats->lo_space_size = lo_space_->Size(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5387 | isolate_->global_handles()->RecordStats(stats); |
| 5388 | *stats->memory_allocator_size = isolate()->memory_allocator()->Size(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5389 | *stats->memory_allocator_capacity = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5390 | isolate()->memory_allocator()->Size() + |
| 5391 | isolate()->memory_allocator()->Available(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5392 | *stats->os_error = OS::GetLastError(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5393 | isolate()->memory_allocator()->Available(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5394 | if (take_snapshot) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5395 | HeapIterator iterator; |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5396 | for (HeapObject* obj = iterator.next(); |
| 5397 | obj != NULL; |
| 5398 | obj = iterator.next()) { |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5399 | InstanceType type = obj->map()->instance_type(); |
| 5400 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 5401 | stats->objects_per_type[type]++; |
| 5402 | stats->size_per_type[type] += obj->Size(); |
| 5403 | } |
| 5404 | } |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 5405 | } |
| 5406 | |
| 5407 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5408 | intptr_t Heap::PromotedSpaceSize() { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5409 | return old_pointer_space_->Size() |
| 5410 | + old_data_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5411 | + code_space_->Size() |
| 5412 | + map_space_->Size() |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5413 | + cell_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5414 | + lo_space_->Size(); |
| 5415 | } |
| 5416 | |
| 5417 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5418 | int Heap::PromotedExternalMemorySize() { |
| 5419 | if (amount_of_external_allocated_memory_ |
| 5420 | <= amount_of_external_allocated_memory_at_last_global_gc_) return 0; |
| 5421 | return amount_of_external_allocated_memory_ |
| 5422 | - amount_of_external_allocated_memory_at_last_global_gc_; |
| 5423 | } |
| 5424 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5425 | #ifdef DEBUG |
| 5426 | |
| 5427 | // Tags 0, 1, and 3 are used. Use 2 for marking visited HeapObject. |
| 5428 | static const int kMarkTag = 2; |
| 5429 | |
| 5430 | |
| 5431 | class HeapDebugUtils { |
| 5432 | public: |
| 5433 | explicit HeapDebugUtils(Heap* heap) |
| 5434 | : search_for_any_global_(false), |
| 5435 | search_target_(NULL), |
| 5436 | found_target_(false), |
| 5437 | object_stack_(20), |
| 5438 | heap_(heap) { |
| 5439 | } |
| 5440 | |
| 5441 | class MarkObjectVisitor : public ObjectVisitor { |
| 5442 | public: |
| 5443 | explicit MarkObjectVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5444 | |
| 5445 | void VisitPointers(Object** start, Object** end) { |
| 5446 | // Copy all HeapObject pointers in [start, end) |
| 5447 | for (Object** p = start; p < end; p++) { |
| 5448 | if ((*p)->IsHeapObject()) |
| 5449 | utils_->MarkObjectRecursively(p); |
| 5450 | } |
| 5451 | } |
| 5452 | |
| 5453 | HeapDebugUtils* utils_; |
| 5454 | }; |
| 5455 | |
| 5456 | void MarkObjectRecursively(Object** p) { |
| 5457 | if (!(*p)->IsHeapObject()) return; |
| 5458 | |
| 5459 | HeapObject* obj = HeapObject::cast(*p); |
| 5460 | |
| 5461 | Object* map = obj->map(); |
| 5462 | |
| 5463 | if (!map->IsHeapObject()) return; // visited before |
| 5464 | |
| 5465 | if (found_target_) return; // stop if target found |
| 5466 | object_stack_.Add(obj); |
| 5467 | if ((search_for_any_global_ && obj->IsJSGlobalObject()) || |
| 5468 | (!search_for_any_global_ && (obj == search_target_))) { |
| 5469 | found_target_ = true; |
| 5470 | return; |
| 5471 | } |
| 5472 | |
| 5473 | // not visited yet |
| 5474 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 5475 | |
| 5476 | Address map_addr = map_p->address(); |
| 5477 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5478 | obj->set_map_no_write_barrier(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5479 | |
| 5480 | MarkObjectRecursively(&map); |
| 5481 | |
| 5482 | MarkObjectVisitor mark_visitor(this); |
| 5483 | |
| 5484 | obj->IterateBody(map_p->instance_type(), obj->SizeFromMap(map_p), |
| 5485 | &mark_visitor); |
| 5486 | |
| 5487 | if (!found_target_) // don't pop if found the target |
| 5488 | object_stack_.RemoveLast(); |
| 5489 | } |
| 5490 | |
| 5491 | |
| 5492 | class UnmarkObjectVisitor : public ObjectVisitor { |
| 5493 | public: |
| 5494 | explicit UnmarkObjectVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5495 | |
| 5496 | void VisitPointers(Object** start, Object** end) { |
| 5497 | // Copy all HeapObject pointers in [start, end) |
| 5498 | for (Object** p = start; p < end; p++) { |
| 5499 | if ((*p)->IsHeapObject()) |
| 5500 | utils_->UnmarkObjectRecursively(p); |
| 5501 | } |
| 5502 | } |
| 5503 | |
| 5504 | HeapDebugUtils* utils_; |
| 5505 | }; |
| 5506 | |
| 5507 | |
| 5508 | void UnmarkObjectRecursively(Object** p) { |
| 5509 | if (!(*p)->IsHeapObject()) return; |
| 5510 | |
| 5511 | HeapObject* obj = HeapObject::cast(*p); |
| 5512 | |
| 5513 | Object* map = obj->map(); |
| 5514 | |
| 5515 | if (map->IsHeapObject()) return; // unmarked already |
| 5516 | |
| 5517 | Address map_addr = reinterpret_cast<Address>(map); |
| 5518 | |
| 5519 | map_addr -= kMarkTag; |
| 5520 | |
| 5521 | ASSERT_TAG_ALIGNED(map_addr); |
| 5522 | |
| 5523 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 5524 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 5525 | obj->set_map_no_write_barrier(reinterpret_cast<Map*>(map_p)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5526 | |
| 5527 | UnmarkObjectRecursively(reinterpret_cast<Object**>(&map_p)); |
| 5528 | |
| 5529 | UnmarkObjectVisitor unmark_visitor(this); |
| 5530 | |
| 5531 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 5532 | obj->SizeFromMap(Map::cast(map_p)), |
| 5533 | &unmark_visitor); |
| 5534 | } |
| 5535 | |
| 5536 | |
| 5537 | void MarkRootObjectRecursively(Object** root) { |
| 5538 | if (search_for_any_global_) { |
| 5539 | ASSERT(search_target_ == NULL); |
| 5540 | } else { |
| 5541 | ASSERT(search_target_->IsHeapObject()); |
| 5542 | } |
| 5543 | found_target_ = false; |
| 5544 | object_stack_.Clear(); |
| 5545 | |
| 5546 | MarkObjectRecursively(root); |
| 5547 | UnmarkObjectRecursively(root); |
| 5548 | |
| 5549 | if (found_target_) { |
| 5550 | PrintF("=====================================\n"); |
| 5551 | PrintF("==== Path to object ====\n"); |
| 5552 | PrintF("=====================================\n\n"); |
| 5553 | |
| 5554 | ASSERT(!object_stack_.is_empty()); |
| 5555 | for (int i = 0; i < object_stack_.length(); i++) { |
| 5556 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
| 5557 | Object* obj = object_stack_[i]; |
| 5558 | obj->Print(); |
| 5559 | } |
| 5560 | PrintF("=====================================\n"); |
| 5561 | } |
| 5562 | } |
| 5563 | |
| 5564 | // Helper class for visiting HeapObjects recursively. |
| 5565 | class MarkRootVisitor: public ObjectVisitor { |
| 5566 | public: |
| 5567 | explicit MarkRootVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5568 | |
| 5569 | void VisitPointers(Object** start, Object** end) { |
| 5570 | // Visit all HeapObject pointers in [start, end) |
| 5571 | for (Object** p = start; p < end; p++) { |
| 5572 | if ((*p)->IsHeapObject()) |
| 5573 | utils_->MarkRootObjectRecursively(p); |
| 5574 | } |
| 5575 | } |
| 5576 | |
| 5577 | HeapDebugUtils* utils_; |
| 5578 | }; |
| 5579 | |
| 5580 | bool search_for_any_global_; |
| 5581 | Object* search_target_; |
| 5582 | bool found_target_; |
| 5583 | List<Object*> object_stack_; |
| 5584 | Heap* heap_; |
| 5585 | |
| 5586 | friend class Heap; |
| 5587 | }; |
| 5588 | |
| 5589 | #endif |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5590 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5591 | bool Heap::SetUp(bool create_heap_objects) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5592 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 5593 | allocation_timeout_ = FLAG_gc_interval; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5594 | debug_utils_ = new HeapDebugUtils(this); |
| 5595 | #endif |
| 5596 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5597 | // Initialize heap spaces and initial maps and objects. Whenever something |
| 5598 | // goes wrong, just return false. The caller should check the results and |
| 5599 | // call Heap::TearDown() to release allocated memory. |
| 5600 | // |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 5601 | // If the heap is not yet configured (e.g. through the API), configure it. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5602 | // Configuration is based on the flags new-space-size (really the semispace |
| 5603 | // size) and old-space-size if set or the initial values of semispace_size_ |
| 5604 | // and old_generation_size_ otherwise. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5605 | if (!configured_) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5606 | if (!ConfigureHeapDefault()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5607 | } |
| 5608 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5609 | gc_initializer_mutex->Lock(); |
| 5610 | static bool initialized_gc = false; |
| 5611 | if (!initialized_gc) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5612 | initialized_gc = true; |
| 5613 | InitializeScavengingVisitorsTables(); |
| 5614 | NewSpaceScavenger::Initialize(); |
| 5615 | MarkCompactCollector::Initialize(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5616 | } |
| 5617 | gc_initializer_mutex->Unlock(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5618 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 5619 | MarkMapPointersAsEncoded(false); |
| 5620 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5621 | // Set up memory allocator. |
| 5622 | if (!isolate_->memory_allocator()->SetUp(MaxReserved(), MaxExecutableSize())) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5623 | return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5624 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5625 | // Set up new space. |
| 5626 | if (!new_space_.SetUp(reserved_semispace_size_, max_semispace_size_)) { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5627 | return false; |
| 5628 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5629 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5630 | // Initialize old pointer space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5631 | old_pointer_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5632 | new OldSpace(this, |
| 5633 | max_old_generation_size_, |
| 5634 | OLD_POINTER_SPACE, |
| 5635 | NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5636 | if (old_pointer_space_ == NULL) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5637 | if (!old_pointer_space_->SetUp()) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5638 | |
| 5639 | // Initialize old data space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5640 | old_data_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5641 | new OldSpace(this, |
| 5642 | max_old_generation_size_, |
| 5643 | OLD_DATA_SPACE, |
| 5644 | NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5645 | if (old_data_space_ == NULL) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5646 | if (!old_data_space_->SetUp()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5647 | |
| 5648 | // Initialize the code space, set its maximum capacity to the old |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5649 | // generation size. It needs executable memory. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5650 | // On 64-bit platform(s), we put all code objects in a 2 GB range of |
| 5651 | // virtual address space, so that they can call each other with near calls. |
| 5652 | if (code_range_size_ > 0) { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5653 | if (!isolate_->code_range()->SetUp(code_range_size_)) { |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5654 | return false; |
| 5655 | } |
| 5656 | } |
| 5657 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5658 | code_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5659 | new OldSpace(this, max_old_generation_size_, CODE_SPACE, EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5660 | if (code_space_ == NULL) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5661 | if (!code_space_->SetUp()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5662 | |
| 5663 | // Initialize map space. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5664 | map_space_ = new MapSpace(this, |
| 5665 | max_old_generation_size_, |
| 5666 | FLAG_max_map_space_pages, |
| 5667 | MAP_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5668 | if (map_space_ == NULL) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5669 | if (!map_space_->SetUp()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5670 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5671 | // Initialize global property cell space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5672 | cell_space_ = new CellSpace(this, max_old_generation_size_, CELL_SPACE); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5673 | if (cell_space_ == NULL) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5674 | if (!cell_space_->SetUp()) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5675 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5676 | // The large object code space may contain code or data. We set the memory |
| 5677 | // to be non-executable here for safety, but this means we need to enable it |
| 5678 | // explicitly when allocating large code objects. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 5679 | lo_space_ = new LargeObjectSpace(this, max_old_generation_size_, LO_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5680 | if (lo_space_ == NULL) return false; |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5681 | if (!lo_space_->SetUp()) return false; |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 5682 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5683 | // Set up the seed that is used to randomize the string hash function. |
| 5684 | ASSERT(hash_seed() == 0); |
| 5685 | if (FLAG_randomize_hashes) { |
| 5686 | if (FLAG_hash_seed == 0) { |
| 5687 | set_hash_seed( |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 5688 | Smi::FromInt(V8::RandomPrivate(isolate()) & 0x3fffffff)); |
| 5689 | } else { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5690 | set_hash_seed(Smi::FromInt(FLAG_hash_seed)); |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 5691 | } |
| 5692 | } |
| 5693 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5694 | if (create_heap_objects) { |
| 5695 | // Create initial maps. |
| 5696 | if (!CreateInitialMaps()) return false; |
| 5697 | if (!CreateApiObjects()) return false; |
| 5698 | |
| 5699 | // Create initial objects |
| 5700 | if (!CreateInitialObjects()) return false; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 5701 | |
| 5702 | global_contexts_list_ = undefined_value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5703 | } |
| 5704 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5705 | LOG(isolate_, IntPtrTEvent("heap-capacity", Capacity())); |
| 5706 | LOG(isolate_, IntPtrTEvent("heap-available", Available())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5707 | |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 5708 | store_buffer()->SetUp(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5709 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5710 | return true; |
| 5711 | } |
| 5712 | |
| 5713 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5714 | void Heap::SetStackLimits() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5715 | ASSERT(isolate_ != NULL); |
| 5716 | ASSERT(isolate_ == isolate()); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5717 | // On 64 bit machines, pointers are generally out of range of Smis. We write |
| 5718 | // something that looks like an out of range Smi to the GC. |
| 5719 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5720 | // Set up the special root array entries containing the stack limits. |
| 5721 | // These are actually addresses, but the tag makes the GC ignore it. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5722 | roots_[kStackLimitRootIndex] = |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5723 | reinterpret_cast<Object*>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5724 | (isolate_->stack_guard()->jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5725 | roots_[kRealStackLimitRootIndex] = |
| 5726 | reinterpret_cast<Object*>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5727 | (isolate_->stack_guard()->real_jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5728 | } |
| 5729 | |
| 5730 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5731 | void Heap::TearDown() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5732 | if (FLAG_print_cumulative_gc_stat) { |
| 5733 | PrintF("\n\n"); |
| 5734 | PrintF("gc_count=%d ", gc_count_); |
| 5735 | PrintF("mark_sweep_count=%d ", ms_count_); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5736 | PrintF("max_gc_pause=%d ", get_max_gc_pause()); |
| 5737 | PrintF("min_in_mutator=%d ", get_min_in_mutator()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5738 | PrintF("max_alive_after_gc=%" V8_PTR_PREFIX "d ", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5739 | get_max_alive_after_gc()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5740 | PrintF("\n\n"); |
| 5741 | } |
| 5742 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5743 | isolate_->global_handles()->TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5744 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5745 | external_string_table_.TearDown(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5746 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 5747 | new_space_.TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5748 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5749 | if (old_pointer_space_ != NULL) { |
| 5750 | old_pointer_space_->TearDown(); |
| 5751 | delete old_pointer_space_; |
| 5752 | old_pointer_space_ = NULL; |
| 5753 | } |
| 5754 | |
| 5755 | if (old_data_space_ != NULL) { |
| 5756 | old_data_space_->TearDown(); |
| 5757 | delete old_data_space_; |
| 5758 | old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5759 | } |
| 5760 | |
| 5761 | if (code_space_ != NULL) { |
| 5762 | code_space_->TearDown(); |
| 5763 | delete code_space_; |
| 5764 | code_space_ = NULL; |
| 5765 | } |
| 5766 | |
| 5767 | if (map_space_ != NULL) { |
| 5768 | map_space_->TearDown(); |
| 5769 | delete map_space_; |
| 5770 | map_space_ = NULL; |
| 5771 | } |
| 5772 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5773 | if (cell_space_ != NULL) { |
| 5774 | cell_space_->TearDown(); |
| 5775 | delete cell_space_; |
| 5776 | cell_space_ = NULL; |
| 5777 | } |
| 5778 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5779 | if (lo_space_ != NULL) { |
| 5780 | lo_space_->TearDown(); |
| 5781 | delete lo_space_; |
| 5782 | lo_space_ = NULL; |
| 5783 | } |
| 5784 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5785 | store_buffer()->TearDown(); |
| 5786 | incremental_marking()->TearDown(); |
| 5787 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5788 | isolate_->memory_allocator()->TearDown(); |
| 5789 | |
| 5790 | #ifdef DEBUG |
| 5791 | delete debug_utils_; |
| 5792 | debug_utils_ = NULL; |
| 5793 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5794 | } |
| 5795 | |
| 5796 | |
| 5797 | void Heap::Shrink() { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5798 | // Try to shrink all paged spaces. |
| 5799 | PagedSpaces spaces; |
danno@chromium.org | 2c45679 | 2011-11-11 12:00:53 +0000 | [diff] [blame] | 5800 | for (PagedSpace* space = spaces.next(); |
| 5801 | space != NULL; |
| 5802 | space = spaces.next()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5803 | space->ReleaseAllUnusedPages(); |
danno@chromium.org | 2c45679 | 2011-11-11 12:00:53 +0000 | [diff] [blame] | 5804 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5805 | } |
| 5806 | |
| 5807 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 5808 | void Heap::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) { |
| 5809 | ASSERT(callback != NULL); |
| 5810 | GCPrologueCallbackPair pair(callback, gc_type); |
| 5811 | ASSERT(!gc_prologue_callbacks_.Contains(pair)); |
| 5812 | return gc_prologue_callbacks_.Add(pair); |
| 5813 | } |
| 5814 | |
| 5815 | |
| 5816 | void Heap::RemoveGCPrologueCallback(GCPrologueCallback callback) { |
| 5817 | ASSERT(callback != NULL); |
| 5818 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 5819 | if (gc_prologue_callbacks_[i].callback == callback) { |
| 5820 | gc_prologue_callbacks_.Remove(i); |
| 5821 | return; |
| 5822 | } |
| 5823 | } |
| 5824 | UNREACHABLE(); |
| 5825 | } |
| 5826 | |
| 5827 | |
| 5828 | void Heap::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) { |
| 5829 | ASSERT(callback != NULL); |
| 5830 | GCEpilogueCallbackPair pair(callback, gc_type); |
| 5831 | ASSERT(!gc_epilogue_callbacks_.Contains(pair)); |
| 5832 | return gc_epilogue_callbacks_.Add(pair); |
| 5833 | } |
| 5834 | |
| 5835 | |
| 5836 | void Heap::RemoveGCEpilogueCallback(GCEpilogueCallback callback) { |
| 5837 | ASSERT(callback != NULL); |
| 5838 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 5839 | if (gc_epilogue_callbacks_[i].callback == callback) { |
| 5840 | gc_epilogue_callbacks_.Remove(i); |
| 5841 | return; |
| 5842 | } |
| 5843 | } |
| 5844 | UNREACHABLE(); |
| 5845 | } |
| 5846 | |
| 5847 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5848 | #ifdef DEBUG |
| 5849 | |
| 5850 | class PrintHandleVisitor: public ObjectVisitor { |
| 5851 | public: |
| 5852 | void VisitPointers(Object** start, Object** end) { |
| 5853 | for (Object** p = start; p < end; p++) |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5854 | PrintF(" handle %p to %p\n", |
| 5855 | reinterpret_cast<void*>(p), |
| 5856 | reinterpret_cast<void*>(*p)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5857 | } |
| 5858 | }; |
| 5859 | |
| 5860 | void Heap::PrintHandles() { |
| 5861 | PrintF("Handles:\n"); |
| 5862 | PrintHandleVisitor v; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5863 | isolate_->handle_scope_implementer()->Iterate(&v); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5864 | } |
| 5865 | |
| 5866 | #endif |
| 5867 | |
| 5868 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5869 | Space* AllSpaces::next() { |
| 5870 | switch (counter_++) { |
| 5871 | case NEW_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5872 | return HEAP->new_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5873 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5874 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5875 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5876 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5877 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5878 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5879 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5880 | return HEAP->map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5881 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5882 | return HEAP->cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5883 | case LO_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5884 | return HEAP->lo_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5885 | default: |
| 5886 | return NULL; |
| 5887 | } |
| 5888 | } |
| 5889 | |
| 5890 | |
| 5891 | PagedSpace* PagedSpaces::next() { |
| 5892 | switch (counter_++) { |
| 5893 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5894 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5895 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5896 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5897 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5898 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5899 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5900 | return HEAP->map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5901 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5902 | return HEAP->cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5903 | default: |
| 5904 | return NULL; |
| 5905 | } |
| 5906 | } |
| 5907 | |
| 5908 | |
| 5909 | |
| 5910 | OldSpace* OldSpaces::next() { |
| 5911 | switch (counter_++) { |
| 5912 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5913 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5914 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5915 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5916 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5917 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5918 | default: |
| 5919 | return NULL; |
| 5920 | } |
| 5921 | } |
| 5922 | |
| 5923 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5924 | SpaceIterator::SpaceIterator() |
| 5925 | : current_space_(FIRST_SPACE), |
| 5926 | iterator_(NULL), |
| 5927 | size_func_(NULL) { |
| 5928 | } |
| 5929 | |
| 5930 | |
| 5931 | SpaceIterator::SpaceIterator(HeapObjectCallback size_func) |
| 5932 | : current_space_(FIRST_SPACE), |
| 5933 | iterator_(NULL), |
| 5934 | size_func_(size_func) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5935 | } |
| 5936 | |
| 5937 | |
| 5938 | SpaceIterator::~SpaceIterator() { |
| 5939 | // Delete active iterator if any. |
| 5940 | delete iterator_; |
| 5941 | } |
| 5942 | |
| 5943 | |
| 5944 | bool SpaceIterator::has_next() { |
| 5945 | // Iterate until no more spaces. |
| 5946 | return current_space_ != LAST_SPACE; |
| 5947 | } |
| 5948 | |
| 5949 | |
| 5950 | ObjectIterator* SpaceIterator::next() { |
| 5951 | if (iterator_ != NULL) { |
| 5952 | delete iterator_; |
| 5953 | iterator_ = NULL; |
| 5954 | // Move to the next space |
| 5955 | current_space_++; |
| 5956 | if (current_space_ > LAST_SPACE) { |
| 5957 | return NULL; |
| 5958 | } |
| 5959 | } |
| 5960 | |
| 5961 | // Return iterator for the new current space. |
| 5962 | return CreateIterator(); |
| 5963 | } |
| 5964 | |
| 5965 | |
| 5966 | // Create an iterator for the space to iterate. |
| 5967 | ObjectIterator* SpaceIterator::CreateIterator() { |
| 5968 | ASSERT(iterator_ == NULL); |
| 5969 | |
| 5970 | switch (current_space_) { |
| 5971 | case NEW_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5972 | iterator_ = new SemiSpaceIterator(HEAP->new_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5973 | break; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5974 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5975 | iterator_ = new HeapObjectIterator(HEAP->old_pointer_space(), size_func_); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5976 | break; |
| 5977 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5978 | iterator_ = new HeapObjectIterator(HEAP->old_data_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5979 | break; |
| 5980 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5981 | iterator_ = new HeapObjectIterator(HEAP->code_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5982 | break; |
| 5983 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5984 | iterator_ = new HeapObjectIterator(HEAP->map_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5985 | break; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5986 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5987 | iterator_ = new HeapObjectIterator(HEAP->cell_space(), size_func_); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5988 | break; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5989 | case LO_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5990 | iterator_ = new LargeObjectIterator(HEAP->lo_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5991 | break; |
| 5992 | } |
| 5993 | |
| 5994 | // Return the newly allocated iterator; |
| 5995 | ASSERT(iterator_ != NULL); |
| 5996 | return iterator_; |
| 5997 | } |
| 5998 | |
| 5999 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6000 | class HeapObjectsFilter { |
| 6001 | public: |
| 6002 | virtual ~HeapObjectsFilter() {} |
| 6003 | virtual bool SkipObject(HeapObject* object) = 0; |
| 6004 | }; |
| 6005 | |
| 6006 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6007 | class UnreachableObjectsFilter : public HeapObjectsFilter { |
| 6008 | public: |
| 6009 | UnreachableObjectsFilter() { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6010 | MarkReachableObjects(); |
| 6011 | } |
| 6012 | |
| 6013 | ~UnreachableObjectsFilter() { |
| 6014 | Isolate::Current()->heap()->mark_compact_collector()->ClearMarkbits(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6015 | } |
| 6016 | |
| 6017 | bool SkipObject(HeapObject* object) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6018 | MarkBit mark_bit = Marking::MarkBitFrom(object); |
| 6019 | return !mark_bit.Get(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6020 | } |
| 6021 | |
| 6022 | private: |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6023 | class MarkingVisitor : public ObjectVisitor { |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6024 | public: |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6025 | MarkingVisitor() : marking_stack_(10) {} |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6026 | |
| 6027 | void VisitPointers(Object** start, Object** end) { |
| 6028 | for (Object** p = start; p < end; p++) { |
| 6029 | if (!(*p)->IsHeapObject()) continue; |
| 6030 | HeapObject* obj = HeapObject::cast(*p); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6031 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 6032 | if (!mark_bit.Get()) { |
| 6033 | mark_bit.Set(); |
| 6034 | marking_stack_.Add(obj); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6035 | } |
| 6036 | } |
| 6037 | } |
| 6038 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6039 | void TransitiveClosure() { |
| 6040 | while (!marking_stack_.is_empty()) { |
| 6041 | HeapObject* obj = marking_stack_.RemoveLast(); |
| 6042 | obj->Iterate(this); |
| 6043 | } |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6044 | } |
| 6045 | |
| 6046 | private: |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6047 | List<HeapObject*> marking_stack_; |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6048 | }; |
| 6049 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6050 | void MarkReachableObjects() { |
| 6051 | Heap* heap = Isolate::Current()->heap(); |
| 6052 | MarkingVisitor visitor; |
| 6053 | heap->IterateRoots(&visitor, VISIT_ALL); |
| 6054 | visitor.TransitiveClosure(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6055 | } |
| 6056 | |
| 6057 | AssertNoAllocation no_alloc; |
| 6058 | }; |
| 6059 | |
| 6060 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6061 | HeapIterator::HeapIterator() |
| 6062 | : filtering_(HeapIterator::kNoFiltering), |
| 6063 | filter_(NULL) { |
| 6064 | Init(); |
| 6065 | } |
| 6066 | |
| 6067 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6068 | HeapIterator::HeapIterator(HeapIterator::HeapObjectsFiltering filtering) |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6069 | : filtering_(filtering), |
| 6070 | filter_(NULL) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6071 | Init(); |
| 6072 | } |
| 6073 | |
| 6074 | |
| 6075 | HeapIterator::~HeapIterator() { |
| 6076 | Shutdown(); |
| 6077 | } |
| 6078 | |
| 6079 | |
| 6080 | void HeapIterator::Init() { |
| 6081 | // Start the iteration. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6082 | space_iterator_ = new SpaceIterator; |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6083 | switch (filtering_) { |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6084 | case kFilterUnreachable: |
| 6085 | filter_ = new UnreachableObjectsFilter; |
| 6086 | break; |
| 6087 | default: |
| 6088 | break; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6089 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6090 | object_iterator_ = space_iterator_->next(); |
| 6091 | } |
| 6092 | |
| 6093 | |
| 6094 | void HeapIterator::Shutdown() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6095 | #ifdef DEBUG |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6096 | // Assert that in filtering mode we have iterated through all |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6097 | // objects. Otherwise, heap will be left in an inconsistent state. |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6098 | if (filtering_ != kNoFiltering) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6099 | ASSERT(object_iterator_ == NULL); |
| 6100 | } |
| 6101 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6102 | // Make sure the last iterator is deallocated. |
| 6103 | delete space_iterator_; |
| 6104 | space_iterator_ = NULL; |
| 6105 | object_iterator_ = NULL; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6106 | delete filter_; |
| 6107 | filter_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6108 | } |
| 6109 | |
| 6110 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 6111 | HeapObject* HeapIterator::next() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6112 | if (filter_ == NULL) return NextObject(); |
| 6113 | |
| 6114 | HeapObject* obj = NextObject(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 6115 | while (obj != NULL && filter_->SkipObject(obj)) obj = NextObject(); |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 6116 | return obj; |
| 6117 | } |
| 6118 | |
| 6119 | |
| 6120 | HeapObject* HeapIterator::NextObject() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6121 | // No iterator means we are done. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 6122 | if (object_iterator_ == NULL) return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6123 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 6124 | if (HeapObject* obj = object_iterator_->next_object()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6125 | // If the current iterator has more objects we are fine. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 6126 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6127 | } else { |
| 6128 | // Go though the spaces looking for one that has objects. |
| 6129 | while (space_iterator_->has_next()) { |
| 6130 | object_iterator_ = space_iterator_->next(); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 6131 | if (HeapObject* obj = object_iterator_->next_object()) { |
| 6132 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6133 | } |
| 6134 | } |
| 6135 | } |
| 6136 | // Done with the last space. |
| 6137 | object_iterator_ = NULL; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 6138 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6139 | } |
| 6140 | |
| 6141 | |
| 6142 | void HeapIterator::reset() { |
| 6143 | // Restart the iterator. |
| 6144 | Shutdown(); |
| 6145 | Init(); |
| 6146 | } |
| 6147 | |
| 6148 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6149 | #if defined(DEBUG) || defined(LIVE_OBJECT_LIST) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6150 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6151 | Object* const PathTracer::kAnyGlobalObject = reinterpret_cast<Object*>(NULL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6152 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6153 | class PathTracer::MarkVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6154 | public: |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6155 | explicit MarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6156 | void VisitPointers(Object** start, Object** end) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6157 | // Scan all HeapObject pointers in [start, end) |
| 6158 | for (Object** p = start; !tracer_->found() && (p < end); p++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6159 | if ((*p)->IsHeapObject()) |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6160 | tracer_->MarkRecursively(p, this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6161 | } |
| 6162 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6163 | |
| 6164 | private: |
| 6165 | PathTracer* tracer_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6166 | }; |
| 6167 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6168 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6169 | class PathTracer::UnmarkVisitor: public ObjectVisitor { |
| 6170 | public: |
| 6171 | explicit UnmarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
| 6172 | void VisitPointers(Object** start, Object** end) { |
| 6173 | // Scan all HeapObject pointers in [start, end) |
| 6174 | for (Object** p = start; p < end; p++) { |
| 6175 | if ((*p)->IsHeapObject()) |
| 6176 | tracer_->UnmarkRecursively(p, this); |
| 6177 | } |
| 6178 | } |
| 6179 | |
| 6180 | private: |
| 6181 | PathTracer* tracer_; |
| 6182 | }; |
| 6183 | |
| 6184 | |
| 6185 | void PathTracer::VisitPointers(Object** start, Object** end) { |
| 6186 | bool done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 6187 | // Visit all HeapObject pointers in [start, end) |
| 6188 | for (Object** p = start; !done && (p < end); p++) { |
| 6189 | if ((*p)->IsHeapObject()) { |
| 6190 | TracePathFrom(p); |
| 6191 | done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 6192 | } |
| 6193 | } |
| 6194 | } |
| 6195 | |
| 6196 | |
| 6197 | void PathTracer::Reset() { |
| 6198 | found_target_ = false; |
| 6199 | object_stack_.Clear(); |
| 6200 | } |
| 6201 | |
| 6202 | |
| 6203 | void PathTracer::TracePathFrom(Object** root) { |
| 6204 | ASSERT((search_target_ == kAnyGlobalObject) || |
| 6205 | search_target_->IsHeapObject()); |
| 6206 | found_target_in_trace_ = false; |
| 6207 | object_stack_.Clear(); |
| 6208 | |
| 6209 | MarkVisitor mark_visitor(this); |
| 6210 | MarkRecursively(root, &mark_visitor); |
| 6211 | |
| 6212 | UnmarkVisitor unmark_visitor(this); |
| 6213 | UnmarkRecursively(root, &unmark_visitor); |
| 6214 | |
| 6215 | ProcessResults(); |
| 6216 | } |
| 6217 | |
| 6218 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6219 | static bool SafeIsGlobalContext(HeapObject* obj) { |
| 6220 | return obj->map() == obj->GetHeap()->raw_unchecked_global_context_map(); |
| 6221 | } |
| 6222 | |
| 6223 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6224 | void PathTracer::MarkRecursively(Object** p, MarkVisitor* mark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6225 | if (!(*p)->IsHeapObject()) return; |
| 6226 | |
| 6227 | HeapObject* obj = HeapObject::cast(*p); |
| 6228 | |
| 6229 | Object* map = obj->map(); |
| 6230 | |
| 6231 | if (!map->IsHeapObject()) return; // visited before |
| 6232 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6233 | if (found_target_in_trace_) return; // stop if target found |
| 6234 | object_stack_.Add(obj); |
| 6235 | if (((search_target_ == kAnyGlobalObject) && obj->IsJSGlobalObject()) || |
| 6236 | (obj == search_target_)) { |
| 6237 | found_target_in_trace_ = true; |
| 6238 | found_target_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6239 | return; |
| 6240 | } |
| 6241 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6242 | bool is_global_context = SafeIsGlobalContext(obj); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6243 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6244 | // not visited yet |
| 6245 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 6246 | |
| 6247 | Address map_addr = map_p->address(); |
| 6248 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 6249 | obj->set_map_no_write_barrier(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6250 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6251 | // Scan the object body. |
| 6252 | if (is_global_context && (visit_mode_ == VISIT_ONLY_STRONG)) { |
| 6253 | // This is specialized to scan Context's properly. |
| 6254 | Object** start = reinterpret_cast<Object**>(obj->address() + |
| 6255 | Context::kHeaderSize); |
| 6256 | Object** end = reinterpret_cast<Object**>(obj->address() + |
| 6257 | Context::kHeaderSize + Context::FIRST_WEAK_SLOT * kPointerSize); |
| 6258 | mark_visitor->VisitPointers(start, end); |
| 6259 | } else { |
| 6260 | obj->IterateBody(map_p->instance_type(), |
| 6261 | obj->SizeFromMap(map_p), |
| 6262 | mark_visitor); |
| 6263 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6264 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6265 | // Scan the map after the body because the body is a lot more interesting |
| 6266 | // when doing leak detection. |
| 6267 | MarkRecursively(&map, mark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6268 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6269 | if (!found_target_in_trace_) // don't pop if found the target |
| 6270 | object_stack_.RemoveLast(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6271 | } |
| 6272 | |
| 6273 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6274 | void PathTracer::UnmarkRecursively(Object** p, UnmarkVisitor* unmark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6275 | if (!(*p)->IsHeapObject()) return; |
| 6276 | |
| 6277 | HeapObject* obj = HeapObject::cast(*p); |
| 6278 | |
| 6279 | Object* map = obj->map(); |
| 6280 | |
| 6281 | if (map->IsHeapObject()) return; // unmarked already |
| 6282 | |
| 6283 | Address map_addr = reinterpret_cast<Address>(map); |
| 6284 | |
| 6285 | map_addr -= kMarkTag; |
| 6286 | |
| 6287 | ASSERT_TAG_ALIGNED(map_addr); |
| 6288 | |
| 6289 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 6290 | |
ricow@chromium.org | 64e3a4b | 2011-12-13 08:07:27 +0000 | [diff] [blame] | 6291 | obj->set_map_no_write_barrier(reinterpret_cast<Map*>(map_p)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6292 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6293 | UnmarkRecursively(reinterpret_cast<Object**>(&map_p), unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6294 | |
| 6295 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 6296 | obj->SizeFromMap(Map::cast(map_p)), |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6297 | unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6298 | } |
| 6299 | |
| 6300 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6301 | void PathTracer::ProcessResults() { |
| 6302 | if (found_target_) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6303 | PrintF("=====================================\n"); |
| 6304 | PrintF("==== Path to object ====\n"); |
| 6305 | PrintF("=====================================\n\n"); |
| 6306 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6307 | ASSERT(!object_stack_.is_empty()); |
| 6308 | for (int i = 0; i < object_stack_.length(); i++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6309 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6310 | Object* obj = object_stack_[i]; |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 6311 | #ifdef OBJECT_PRINT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6312 | obj->Print(); |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 6313 | #else |
| 6314 | obj->ShortPrint(); |
| 6315 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6316 | } |
| 6317 | PrintF("=====================================\n"); |
| 6318 | } |
| 6319 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6320 | #endif // DEBUG || LIVE_OBJECT_LIST |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6321 | |
| 6322 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6323 | #ifdef DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6324 | // Triggers a depth-first traversal of reachable objects from roots |
| 6325 | // and finds a path to a specific heap object and prints it. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6326 | void Heap::TracePathToObject(Object* target) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6327 | PathTracer tracer(target, PathTracer::FIND_ALL, VISIT_ALL); |
| 6328 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6329 | } |
| 6330 | |
| 6331 | |
| 6332 | // Triggers a depth-first traversal of reachable objects from roots |
| 6333 | // and finds a path to any global object and prints it. Useful for |
| 6334 | // determining the source for leaks of global objects. |
| 6335 | void Heap::TracePathToGlobal() { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6336 | PathTracer tracer(PathTracer::kAnyGlobalObject, |
| 6337 | PathTracer::FIND_ALL, |
| 6338 | VISIT_ALL); |
| 6339 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6340 | } |
| 6341 | #endif |
| 6342 | |
| 6343 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6344 | static intptr_t CountTotalHolesSize() { |
| 6345 | intptr_t holes_size = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6346 | OldSpaces spaces; |
| 6347 | for (OldSpace* space = spaces.next(); |
| 6348 | space != NULL; |
| 6349 | space = spaces.next()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6350 | holes_size += space->Waste() + space->Available(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6351 | } |
| 6352 | return holes_size; |
| 6353 | } |
| 6354 | |
| 6355 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6356 | GCTracer::GCTracer(Heap* heap) |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6357 | : start_time_(0.0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6358 | start_size_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6359 | gc_count_(0), |
| 6360 | full_gc_count_(0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6361 | allocated_since_last_gc_(0), |
| 6362 | spent_in_mutator_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6363 | promoted_objects_size_(0), |
| 6364 | heap_(heap) { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6365 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6366 | start_time_ = OS::TimeCurrentMillis(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6367 | start_size_ = heap_->SizeOfObjects(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6368 | |
| 6369 | for (int i = 0; i < Scope::kNumberOfScopes; i++) { |
| 6370 | scopes_[i] = 0; |
| 6371 | } |
| 6372 | |
| 6373 | in_free_list_or_wasted_before_gc_ = CountTotalHolesSize(); |
| 6374 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6375 | allocated_since_last_gc_ = |
| 6376 | heap_->SizeOfObjects() - heap_->alive_after_last_gc_; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6377 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6378 | if (heap_->last_gc_end_timestamp_ > 0) { |
| 6379 | spent_in_mutator_ = Max(start_time_ - heap_->last_gc_end_timestamp_, 0.0); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6380 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6381 | |
| 6382 | steps_count_ = heap_->incremental_marking()->steps_count(); |
| 6383 | steps_took_ = heap_->incremental_marking()->steps_took(); |
| 6384 | longest_step_ = heap_->incremental_marking()->longest_step(); |
| 6385 | steps_count_since_last_gc_ = |
| 6386 | heap_->incremental_marking()->steps_count_since_last_gc(); |
| 6387 | steps_took_since_last_gc_ = |
| 6388 | heap_->incremental_marking()->steps_took_since_last_gc(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6389 | } |
| 6390 | |
| 6391 | |
| 6392 | GCTracer::~GCTracer() { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6393 | // Printf ONE line iff flag is set. |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6394 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
| 6395 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6396 | bool first_gc = (heap_->last_gc_end_timestamp_ == 0); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6397 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6398 | heap_->alive_after_last_gc_ = heap_->SizeOfObjects(); |
| 6399 | heap_->last_gc_end_timestamp_ = OS::TimeCurrentMillis(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6400 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6401 | int time = static_cast<int>(heap_->last_gc_end_timestamp_ - start_time_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6402 | |
| 6403 | // Update cumulative GC statistics if required. |
| 6404 | if (FLAG_print_cumulative_gc_stat) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6405 | heap_->max_gc_pause_ = Max(heap_->max_gc_pause_, time); |
| 6406 | heap_->max_alive_after_gc_ = Max(heap_->max_alive_after_gc_, |
| 6407 | heap_->alive_after_last_gc_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6408 | if (!first_gc) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6409 | heap_->min_in_mutator_ = Min(heap_->min_in_mutator_, |
| 6410 | static_cast<int>(spent_in_mutator_)); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6411 | } |
| 6412 | } |
| 6413 | |
| 6414 | if (!FLAG_trace_gc_nvp) { |
| 6415 | int external_time = static_cast<int>(scopes_[Scope::EXTERNAL]); |
| 6416 | |
| 6417 | PrintF("%s %.1f -> %.1f MB, ", |
| 6418 | CollectorString(), |
| 6419 | static_cast<double>(start_size_) / MB, |
| 6420 | SizeOfHeapObjects()); |
| 6421 | |
| 6422 | if (external_time > 0) PrintF("%d / ", external_time); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6423 | PrintF("%d ms", time); |
| 6424 | if (steps_count_ > 0) { |
| 6425 | if (collector_ == SCAVENGER) { |
| 6426 | PrintF(" (+ %d ms in %d steps since last GC)", |
| 6427 | static_cast<int>(steps_took_since_last_gc_), |
| 6428 | steps_count_since_last_gc_); |
| 6429 | } else { |
| 6430 | PrintF(" (+ %d ms in %d steps since start of marking, " |
| 6431 | "biggest step %f ms)", |
| 6432 | static_cast<int>(steps_took_), |
| 6433 | steps_count_, |
| 6434 | longest_step_); |
| 6435 | } |
| 6436 | } |
| 6437 | PrintF(".\n"); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6438 | } else { |
| 6439 | PrintF("pause=%d ", time); |
| 6440 | PrintF("mutator=%d ", |
| 6441 | static_cast<int>(spent_in_mutator_)); |
| 6442 | |
| 6443 | PrintF("gc="); |
| 6444 | switch (collector_) { |
| 6445 | case SCAVENGER: |
| 6446 | PrintF("s"); |
| 6447 | break; |
| 6448 | case MARK_COMPACTOR: |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6449 | PrintF("ms"); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6450 | break; |
| 6451 | default: |
| 6452 | UNREACHABLE(); |
| 6453 | } |
| 6454 | PrintF(" "); |
| 6455 | |
| 6456 | PrintF("external=%d ", static_cast<int>(scopes_[Scope::EXTERNAL])); |
| 6457 | PrintF("mark=%d ", static_cast<int>(scopes_[Scope::MC_MARK])); |
| 6458 | PrintF("sweep=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP])); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 6459 | PrintF("sweepns=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP_NEWSPACE])); |
mstarzinger@chromium.org | 1b3afd1 | 2011-11-29 14:28:56 +0000 | [diff] [blame] | 6460 | PrintF("evacuate=%d ", static_cast<int>(scopes_[Scope::MC_EVACUATE_PAGES])); |
| 6461 | PrintF("new_new=%d ", |
| 6462 | static_cast<int>(scopes_[Scope::MC_UPDATE_NEW_TO_NEW_POINTERS])); |
| 6463 | PrintF("root_new=%d ", |
| 6464 | static_cast<int>(scopes_[Scope::MC_UPDATE_ROOT_TO_NEW_POINTERS])); |
| 6465 | PrintF("old_new=%d ", |
| 6466 | static_cast<int>(scopes_[Scope::MC_UPDATE_OLD_TO_NEW_POINTERS])); |
| 6467 | PrintF("compaction_ptrs=%d ", |
| 6468 | static_cast<int>(scopes_[Scope::MC_UPDATE_POINTERS_TO_EVACUATED])); |
| 6469 | PrintF("intracompaction_ptrs=%d ", static_cast<int>(scopes_[ |
| 6470 | Scope::MC_UPDATE_POINTERS_BETWEEN_EVACUATED])); |
| 6471 | PrintF("misc_compaction=%d ", |
| 6472 | static_cast<int>(scopes_[Scope::MC_UPDATE_MISC_POINTERS])); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6473 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6474 | PrintF("total_size_before=%" V8_PTR_PREFIX "d ", start_size_); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6475 | PrintF("total_size_after=%" V8_PTR_PREFIX "d ", heap_->SizeOfObjects()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6476 | PrintF("holes_size_before=%" V8_PTR_PREFIX "d ", |
| 6477 | in_free_list_or_wasted_before_gc_); |
| 6478 | PrintF("holes_size_after=%" V8_PTR_PREFIX "d ", CountTotalHolesSize()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6479 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6480 | PrintF("allocated=%" V8_PTR_PREFIX "d ", allocated_since_last_gc_); |
| 6481 | PrintF("promoted=%" V8_PTR_PREFIX "d ", promoted_objects_size_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6482 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6483 | if (collector_ == SCAVENGER) { |
| 6484 | PrintF("stepscount=%d ", steps_count_since_last_gc_); |
| 6485 | PrintF("stepstook=%d ", static_cast<int>(steps_took_since_last_gc_)); |
| 6486 | } else { |
| 6487 | PrintF("stepscount=%d ", steps_count_); |
| 6488 | PrintF("stepstook=%d ", static_cast<int>(steps_took_)); |
| 6489 | } |
| 6490 | |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6491 | PrintF("\n"); |
| 6492 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 6493 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6494 | heap_->PrintShortHeapStatistics(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6495 | } |
| 6496 | |
| 6497 | |
| 6498 | const char* GCTracer::CollectorString() { |
| 6499 | switch (collector_) { |
| 6500 | case SCAVENGER: |
| 6501 | return "Scavenge"; |
| 6502 | case MARK_COMPACTOR: |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6503 | return "Mark-sweep"; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6504 | } |
| 6505 | return "Unknown GC"; |
| 6506 | } |
| 6507 | |
| 6508 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6509 | int KeyedLookupCache::Hash(Map* map, String* name) { |
| 6510 | // Uses only lower 32 bits if pointers are larger. |
| 6511 | uintptr_t addr_hash = |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6512 | static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> kMapHashShift; |
fschneider@chromium.org | b95b98b | 2010-02-23 10:34:29 +0000 | [diff] [blame] | 6513 | return static_cast<uint32_t>((addr_hash ^ name->Hash()) & kCapacityMask); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6514 | } |
| 6515 | |
| 6516 | |
| 6517 | int KeyedLookupCache::Lookup(Map* map, String* name) { |
| 6518 | int index = Hash(map, name); |
| 6519 | Key& key = keys_[index]; |
| 6520 | if ((key.map == map) && key.name->Equals(name)) { |
| 6521 | return field_offsets_[index]; |
| 6522 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6523 | return kNotFound; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6524 | } |
| 6525 | |
| 6526 | |
| 6527 | void KeyedLookupCache::Update(Map* map, String* name, int field_offset) { |
| 6528 | String* symbol; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6529 | if (HEAP->LookupSymbolIfExists(name, &symbol)) { |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6530 | int index = Hash(map, symbol); |
| 6531 | Key& key = keys_[index]; |
| 6532 | key.map = map; |
| 6533 | key.name = symbol; |
| 6534 | field_offsets_[index] = field_offset; |
| 6535 | } |
| 6536 | } |
| 6537 | |
| 6538 | |
| 6539 | void KeyedLookupCache::Clear() { |
| 6540 | for (int index = 0; index < kLength; index++) keys_[index].map = NULL; |
| 6541 | } |
| 6542 | |
| 6543 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6544 | void DescriptorLookupCache::Clear() { |
| 6545 | for (int index = 0; index < kLength; index++) keys_[index].array = NULL; |
| 6546 | } |
| 6547 | |
| 6548 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6549 | #ifdef DEBUG |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 6550 | void Heap::GarbageCollectionGreedyCheck() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6551 | ASSERT(FLAG_gc_greedy); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6552 | if (isolate_->bootstrapper()->IsActive()) return; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 6553 | if (disallow_allocation_failure()) return; |
| 6554 | CollectGarbage(NEW_SPACE); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6555 | } |
| 6556 | #endif |
| 6557 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6558 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6559 | TranscendentalCache::SubCache::SubCache(Type t) |
| 6560 | : type_(t), |
| 6561 | isolate_(Isolate::Current()) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6562 | uint32_t in0 = 0xffffffffu; // Bit-pattern for a NaN that isn't |
| 6563 | uint32_t in1 = 0xffffffffu; // generated by the FPU. |
| 6564 | for (int i = 0; i < kCacheSize; i++) { |
| 6565 | elements_[i].in[0] = in0; |
| 6566 | elements_[i].in[1] = in1; |
| 6567 | elements_[i].output = NULL; |
| 6568 | } |
| 6569 | } |
| 6570 | |
| 6571 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6572 | void TranscendentalCache::Clear() { |
| 6573 | for (int i = 0; i < kNumberOfCaches; i++) { |
| 6574 | if (caches_[i] != NULL) { |
| 6575 | delete caches_[i]; |
| 6576 | caches_[i] = NULL; |
| 6577 | } |
| 6578 | } |
| 6579 | } |
| 6580 | |
| 6581 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6582 | void ExternalStringTable::CleanUp() { |
| 6583 | int last = 0; |
| 6584 | for (int i = 0; i < new_space_strings_.length(); ++i) { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 6585 | if (new_space_strings_[i] == heap_->raw_unchecked_the_hole_value()) { |
| 6586 | continue; |
| 6587 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6588 | if (heap_->InNewSpace(new_space_strings_[i])) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6589 | new_space_strings_[last++] = new_space_strings_[i]; |
| 6590 | } else { |
| 6591 | old_space_strings_.Add(new_space_strings_[i]); |
| 6592 | } |
| 6593 | } |
| 6594 | new_space_strings_.Rewind(last); |
| 6595 | last = 0; |
| 6596 | for (int i = 0; i < old_space_strings_.length(); ++i) { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 6597 | if (old_space_strings_[i] == heap_->raw_unchecked_the_hole_value()) { |
| 6598 | continue; |
| 6599 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6600 | ASSERT(!heap_->InNewSpace(old_space_strings_[i])); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6601 | old_space_strings_[last++] = old_space_strings_[i]; |
| 6602 | } |
| 6603 | old_space_strings_.Rewind(last); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 6604 | if (FLAG_verify_heap) { |
| 6605 | Verify(); |
| 6606 | } |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6607 | } |
| 6608 | |
| 6609 | |
| 6610 | void ExternalStringTable::TearDown() { |
| 6611 | new_space_strings_.Free(); |
| 6612 | old_space_strings_.Free(); |
| 6613 | } |
| 6614 | |
| 6615 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6616 | void Heap::QueueMemoryChunkForFree(MemoryChunk* chunk) { |
| 6617 | chunk->set_next_chunk(chunks_queued_for_free_); |
| 6618 | chunks_queued_for_free_ = chunk; |
| 6619 | } |
| 6620 | |
| 6621 | |
| 6622 | void Heap::FreeQueuedChunks() { |
| 6623 | if (chunks_queued_for_free_ == NULL) return; |
| 6624 | MemoryChunk* next; |
| 6625 | MemoryChunk* chunk; |
| 6626 | for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) { |
| 6627 | next = chunk->next_chunk(); |
| 6628 | chunk->SetFlag(MemoryChunk::ABOUT_TO_BE_FREED); |
| 6629 | |
| 6630 | if (chunk->owner()->identity() == LO_SPACE) { |
| 6631 | // StoreBuffer::Filter relies on MemoryChunk::FromAnyPointerAddress. |
| 6632 | // If FromAnyPointerAddress encounters a slot that belongs to a large |
| 6633 | // chunk queued for deletion it will fail to find the chunk because |
| 6634 | // it try to perform a search in the list of pages owned by of the large |
| 6635 | // object space and queued chunks were detached from that list. |
| 6636 | // To work around this we split large chunk into normal kPageSize aligned |
danno@chromium.org | 2c45679 | 2011-11-11 12:00:53 +0000 | [diff] [blame] | 6637 | // pieces and initialize size, owner and flags field of every piece. |
| 6638 | // If FromAnyPointerAddress encounters a slot that belongs to one of |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6639 | // these smaller pieces it will treat it as a slot on a normal Page. |
| 6640 | MemoryChunk* inner = MemoryChunk::FromAddress( |
| 6641 | chunk->address() + Page::kPageSize); |
| 6642 | MemoryChunk* inner_last = MemoryChunk::FromAddress( |
| 6643 | chunk->address() + chunk->size() - 1); |
| 6644 | while (inner <= inner_last) { |
| 6645 | // Size of a large chunk is always a multiple of |
jkummerow@chromium.org | 04e4f1e | 2011-11-14 13:36:17 +0000 | [diff] [blame] | 6646 | // OS::AllocateAlignment() so there is always |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6647 | // enough space for a fake MemoryChunk header. |
danno@chromium.org | 2c45679 | 2011-11-11 12:00:53 +0000 | [diff] [blame] | 6648 | inner->set_size(Page::kPageSize); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6649 | inner->set_owner(lo_space()); |
| 6650 | inner->SetFlag(MemoryChunk::ABOUT_TO_BE_FREED); |
| 6651 | inner = MemoryChunk::FromAddress( |
| 6652 | inner->address() + Page::kPageSize); |
| 6653 | } |
| 6654 | } |
| 6655 | } |
| 6656 | isolate_->heap()->store_buffer()->Compact(); |
| 6657 | isolate_->heap()->store_buffer()->Filter(MemoryChunk::ABOUT_TO_BE_FREED); |
| 6658 | for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) { |
| 6659 | next = chunk->next_chunk(); |
| 6660 | isolate_->memory_allocator()->Free(chunk); |
| 6661 | } |
| 6662 | chunks_queued_for_free_ = NULL; |
| 6663 | } |
| 6664 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6665 | } } // namespace v8::internal |