karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1 | // Copyright 2011 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)), |
| 83 | initial_semispace_size_(Max(LUMP_OF_MEMORY, Page::kPageSize)), |
| 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 |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 115 | old_gen_promotion_limit_(kMinimumPromotionLimit), |
| 116 | old_gen_allocation_limit_(kMinimumAllocationLimit), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 117 | old_gen_limit_factor_(1), |
| 118 | size_of_old_gen_at_last_old_space_gc_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 119 | external_allocation_limit_(0), |
| 120 | amount_of_external_allocated_memory_(0), |
| 121 | amount_of_external_allocated_memory_at_last_global_gc_(0), |
| 122 | old_gen_exhausted_(false), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 123 | store_buffer_rebuilder_(store_buffer()), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 124 | hidden_symbol_(NULL), |
| 125 | global_gc_prologue_callback_(NULL), |
| 126 | global_gc_epilogue_callback_(NULL), |
| 127 | gc_safe_size_of_old_object_(NULL), |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 128 | total_regexp_code_generated_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 129 | tracer_(NULL), |
| 130 | young_survivors_after_last_gc_(0), |
| 131 | high_survival_rate_period_length_(0), |
| 132 | survival_rate_(0), |
| 133 | previous_survival_rate_trend_(Heap::STABLE), |
| 134 | survival_rate_trend_(Heap::STABLE), |
| 135 | max_gc_pause_(0), |
| 136 | max_alive_after_gc_(0), |
| 137 | min_in_mutator_(kMaxInt), |
| 138 | alive_after_last_gc_(0), |
| 139 | last_gc_end_timestamp_(0.0), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 140 | store_buffer_(this), |
| 141 | marking_(this), |
| 142 | incremental_marking_(this), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 143 | number_idle_notifications_(0), |
| 144 | last_idle_notification_gc_count_(0), |
| 145 | last_idle_notification_gc_count_init_(false), |
| 146 | configured_(false), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 147 | chunks_queued_for_free_(NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 148 | // Allow build-time customization of the max semispace size. Building |
| 149 | // V8 with snapshots and a non-default max semispace size is much |
| 150 | // easier if you can define it as part of the build environment. |
| 151 | #if defined(V8_MAX_SEMISPACE_SIZE) |
| 152 | max_semispace_size_ = reserved_semispace_size_ = V8_MAX_SEMISPACE_SIZE; |
| 153 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 154 | |
lrn@chromium.org | ac2828d | 2011-06-23 06:29:21 +0000 | [diff] [blame] | 155 | intptr_t max_virtual = OS::MaxVirtualMemory(); |
| 156 | |
| 157 | if (max_virtual > 0) { |
| 158 | if (code_range_size_ > 0) { |
| 159 | // Reserve no more than 1/8 of the memory for the code range. |
| 160 | code_range_size_ = Min(code_range_size_, max_virtual >> 3); |
| 161 | } |
| 162 | } |
| 163 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 164 | memset(roots_, 0, sizeof(roots_[0]) * kRootListLength); |
| 165 | global_contexts_list_ = NULL; |
| 166 | mark_compact_collector_.heap_ = this; |
| 167 | external_string_table_.heap_ = this; |
| 168 | } |
| 169 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 170 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 171 | intptr_t Heap::Capacity() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 172 | if (!HasBeenSetup()) return 0; |
| 173 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 174 | return new_space_.Capacity() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 175 | old_pointer_space_->Capacity() + |
| 176 | old_data_space_->Capacity() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 177 | code_space_->Capacity() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 178 | map_space_->Capacity() + |
| 179 | cell_space_->Capacity(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 183 | intptr_t Heap::CommittedMemory() { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 184 | if (!HasBeenSetup()) return 0; |
| 185 | |
| 186 | return new_space_.CommittedMemory() + |
| 187 | old_pointer_space_->CommittedMemory() + |
| 188 | old_data_space_->CommittedMemory() + |
| 189 | code_space_->CommittedMemory() + |
| 190 | map_space_->CommittedMemory() + |
| 191 | cell_space_->CommittedMemory() + |
| 192 | lo_space_->Size(); |
| 193 | } |
| 194 | |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 195 | intptr_t Heap::CommittedMemoryExecutable() { |
| 196 | if (!HasBeenSetup()) return 0; |
| 197 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 198 | return isolate()->memory_allocator()->SizeExecutable(); |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 199 | } |
| 200 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 201 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 202 | intptr_t Heap::Available() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 203 | if (!HasBeenSetup()) return 0; |
| 204 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 205 | return new_space_.Available() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 206 | old_pointer_space_->Available() + |
| 207 | old_data_space_->Available() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 208 | code_space_->Available() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 209 | map_space_->Available() + |
| 210 | cell_space_->Available(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | |
| 214 | bool Heap::HasBeenSetup() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 215 | return old_pointer_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 216 | old_data_space_ != NULL && |
| 217 | code_space_ != NULL && |
| 218 | map_space_ != NULL && |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 219 | cell_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 220 | lo_space_ != NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 224 | int Heap::GcSafeSizeOfOldObject(HeapObject* object) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 225 | if (IntrusiveMarking::IsMarked(object)) { |
| 226 | return IntrusiveMarking::SizeOfMarkedObject(object); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 227 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 228 | return object->SizeFromMap(object->map()); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 232 | GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space) { |
| 233 | // Is global GC requested? |
| 234 | if (space != NEW_SPACE || FLAG_gc_global) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 235 | isolate_->counters()->gc_compactor_caused_by_request()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 236 | return MARK_COMPACTOR; |
| 237 | } |
| 238 | |
| 239 | // Is enough data promoted to justify a global GC? |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 240 | if (OldGenerationPromotionLimitReached()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 241 | isolate_->counters()->gc_compactor_caused_by_promoted_data()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 242 | return MARK_COMPACTOR; |
| 243 | } |
| 244 | |
| 245 | // Have allocation in OLD and LO failed? |
| 246 | if (old_gen_exhausted_) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 247 | isolate_->counters()-> |
| 248 | gc_compactor_caused_by_oldspace_exhaustion()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 249 | return MARK_COMPACTOR; |
| 250 | } |
| 251 | |
| 252 | // Is there enough space left in OLD to guarantee that a scavenge can |
| 253 | // succeed? |
| 254 | // |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 255 | // Note that MemoryAllocator->MaxAvailable() undercounts the memory available |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 256 | // for object promotion. It counts only the bytes that the memory |
| 257 | // allocator has not yet allocated from the OS and assigned to any space, |
| 258 | // and does not count available bytes already in the old space or code |
| 259 | // space. Undercounting is safe---we may get an unrequested full GC when |
| 260 | // a scavenge would have succeeded. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 261 | if (isolate_->memory_allocator()->MaxAvailable() <= new_space_.Size()) { |
| 262 | isolate_->counters()-> |
| 263 | gc_compactor_caused_by_oldspace_exhaustion()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 264 | return MARK_COMPACTOR; |
| 265 | } |
| 266 | |
| 267 | // Default |
| 268 | return SCAVENGER; |
| 269 | } |
| 270 | |
| 271 | |
| 272 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 273 | // --log-gc to avoid the complicated preprocessor and flag testing. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 274 | void Heap::ReportStatisticsBeforeGC() { |
| 275 | // Heap::ReportHeapStatistics will also log NewSpace statistics when |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 276 | // compiled --log-gc is set. The following logic is used to avoid |
| 277 | // double logging. |
| 278 | #ifdef DEBUG |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 279 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 280 | if (FLAG_heap_stats) { |
| 281 | ReportHeapStatistics("Before GC"); |
| 282 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 283 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 284 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 285 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.ClearHistograms(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 286 | #else |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 287 | if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 288 | new_space_.CollectStatistics(); |
| 289 | new_space_.ReportStatistics(); |
| 290 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 291 | } |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 292 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 296 | void Heap::PrintShortHeapStatistics() { |
| 297 | if (!FLAG_trace_gc_verbose) return; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 298 | PrintF("Memory allocator, used: %8" V8_PTR_PREFIX "d" |
| 299 | ", available: %8" V8_PTR_PREFIX "d\n", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 300 | isolate_->memory_allocator()->Size(), |
| 301 | isolate_->memory_allocator()->Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 302 | PrintF("New space, used: %8" V8_PTR_PREFIX "d" |
| 303 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 304 | Heap::new_space_.Size(), |
| 305 | new_space_.Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 306 | PrintF("Old pointers, used: %8" V8_PTR_PREFIX "d" |
| 307 | ", available: %8" V8_PTR_PREFIX "d" |
| 308 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 309 | old_pointer_space_->Size(), |
| 310 | old_pointer_space_->Available(), |
| 311 | old_pointer_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 312 | PrintF("Old data space, used: %8" V8_PTR_PREFIX "d" |
| 313 | ", available: %8" V8_PTR_PREFIX "d" |
| 314 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 315 | old_data_space_->Size(), |
| 316 | old_data_space_->Available(), |
| 317 | old_data_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 318 | PrintF("Code space, used: %8" V8_PTR_PREFIX "d" |
| 319 | ", available: %8" V8_PTR_PREFIX "d" |
| 320 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 321 | code_space_->Size(), |
| 322 | code_space_->Available(), |
| 323 | code_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 324 | PrintF("Map space, used: %8" V8_PTR_PREFIX "d" |
| 325 | ", available: %8" V8_PTR_PREFIX "d" |
| 326 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 327 | map_space_->Size(), |
| 328 | map_space_->Available(), |
| 329 | map_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 330 | PrintF("Cell space, used: %8" V8_PTR_PREFIX "d" |
| 331 | ", available: %8" V8_PTR_PREFIX "d" |
| 332 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 333 | cell_space_->Size(), |
| 334 | cell_space_->Available(), |
| 335 | cell_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 336 | PrintF("Large object space, used: %8" V8_PTR_PREFIX "d" |
| 337 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 338 | lo_space_->Size(), |
| 339 | lo_space_->Available()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 340 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 341 | |
| 342 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 343 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 344 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 345 | void Heap::ReportStatisticsAfterGC() { |
| 346 | // Similar to the before GC, we use some complicated logic to ensure that |
| 347 | // 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] | 348 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 349 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 350 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 351 | ReportHeapStatistics("After GC"); |
| 352 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 353 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 354 | } |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 355 | #else |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 356 | if (FLAG_log_gc) new_space_.ReportStatistics(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 357 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 358 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 359 | |
| 360 | |
| 361 | void Heap::GarbageCollectionPrologue() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 362 | isolate_->transcendental_cache()->Clear(); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 363 | ClearJSFunctionResultCaches(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 364 | gc_count_++; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 365 | unflattened_strings_length_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 366 | #ifdef DEBUG |
| 367 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 368 | allow_allocation(false); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 369 | |
| 370 | if (FLAG_verify_heap) { |
| 371 | Verify(); |
| 372 | } |
| 373 | |
| 374 | if (FLAG_gc_verbose) Print(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 375 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 376 | |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 377 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 378 | ReportStatisticsBeforeGC(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 379 | #endif // DEBUG |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 380 | |
| 381 | LiveObjectList::GCPrologue(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 382 | store_buffer()->GCPrologue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 383 | } |
| 384 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 385 | intptr_t Heap::SizeOfObjects() { |
| 386 | intptr_t total = 0; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 387 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 388 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 389 | total += space->SizeOfObjects(); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 390 | } |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 391 | return total; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | void Heap::GarbageCollectionEpilogue() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 395 | store_buffer()->GCEpilogue(); |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 396 | LiveObjectList::GCEpilogue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 397 | #ifdef DEBUG |
| 398 | allow_allocation(true); |
| 399 | ZapFromSpace(); |
| 400 | |
| 401 | if (FLAG_verify_heap) { |
| 402 | Verify(); |
| 403 | } |
| 404 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 405 | if (FLAG_print_global_handles) isolate_->global_handles()->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 406 | if (FLAG_print_handles) PrintHandles(); |
| 407 | if (FLAG_gc_verbose) Print(); |
| 408 | if (FLAG_code_stats) ReportCodeStatistics("After GC"); |
| 409 | #endif |
| 410 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 411 | isolate_->counters()->alive_after_last_gc()->Set( |
| 412 | static_cast<int>(SizeOfObjects())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 413 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 414 | isolate_->counters()->symbol_table_capacity()->Set( |
| 415 | symbol_table()->Capacity()); |
| 416 | isolate_->counters()->number_of_symbols()->Set( |
| 417 | symbol_table()->NumberOfElements()); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 418 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 419 | ReportStatisticsAfterGC(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 420 | #endif // DEBUG |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 421 | #ifdef ENABLE_DEBUGGER_SUPPORT |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 422 | isolate_->debug()->AfterGarbageCollection(); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 423 | #endif // ENABLE_DEBUGGER_SUPPORT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 427 | void Heap::CollectAllGarbage(int flags) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 428 | // Since we are ignoring the return value, the exact choice of space does |
| 429 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 430 | // cause a full GC. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 431 | mark_compact_collector_.SetFlags(flags); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 432 | CollectGarbage(OLD_POINTER_SPACE); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 433 | mark_compact_collector_.SetFlags(kNoGCFlags); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 437 | void Heap::CollectAllAvailableGarbage() { |
| 438 | // Since we are ignoring the return value, the exact choice of space does |
| 439 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 440 | // cause a full GC. |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 441 | // Major GC would invoke weak handle callbacks on weakly reachable |
| 442 | // handles, but won't collect weakly reachable objects until next |
| 443 | // major GC. Therefore if we collect aggressively and weak handle callback |
| 444 | // has been invoked, we rerun major GC to release objects which become |
| 445 | // garbage. |
| 446 | // Note: as weak callbacks can execute arbitrary code, we cannot |
| 447 | // hope that eventually there will be no weak callbacks invocations. |
| 448 | // Therefore stop recollecting after several attempts. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 449 | mark_compact_collector()->SetFlags(kMakeHeapIterableMask); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 450 | const int kMaxNumberOfAttempts = 7; |
| 451 | for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) { |
| 452 | if (!CollectGarbage(OLD_POINTER_SPACE, MARK_COMPACTOR)) { |
| 453 | break; |
| 454 | } |
| 455 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 456 | mark_compact_collector()->SetFlags(kNoGCFlags); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | |
| 460 | bool Heap::CollectGarbage(AllocationSpace space, GarbageCollector collector) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 461 | // The VM is in the GC state until exiting this function. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 462 | VMState state(isolate_, GC); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 463 | |
| 464 | #ifdef DEBUG |
| 465 | // Reset the allocation timeout to the GC interval, but make sure to |
| 466 | // allow at least a few allocations after a collection. The reason |
| 467 | // for this is that we have a lot of allocation sequences and we |
| 468 | // assume that a garbage collection will allow the subsequent |
| 469 | // allocation attempts to go through. |
| 470 | allocation_timeout_ = Max(6, FLAG_gc_interval); |
| 471 | #endif |
| 472 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 473 | if (collector == SCAVENGER && !incremental_marking()->IsStopped()) { |
| 474 | if (FLAG_trace_incremental_marking) { |
| 475 | PrintF("[IncrementalMarking] Scavenge during marking.\n"); |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | if (collector == MARK_COMPACTOR && |
| 480 | !mark_compact_collector()->PreciseSweepingRequired() && |
| 481 | !incremental_marking()->IsStopped() && |
| 482 | !incremental_marking()->should_hurry() && |
| 483 | FLAG_incremental_marking_steps) { |
| 484 | if (FLAG_trace_incremental_marking) { |
| 485 | PrintF("[IncrementalMarking] Delaying MarkSweep.\n"); |
| 486 | } |
| 487 | collector = SCAVENGER; |
| 488 | } |
| 489 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 490 | bool next_gc_likely_to_collect_more = false; |
| 491 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 492 | { GCTracer tracer(this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 493 | GarbageCollectionPrologue(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 494 | // The GC count was incremented in the prologue. Tell the tracer about |
| 495 | // it. |
| 496 | tracer.set_gc_count(gc_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 497 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 498 | // Tell the tracer which collector we've selected. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 499 | tracer.set_collector(collector); |
| 500 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 501 | HistogramTimer* rate = (collector == SCAVENGER) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 502 | ? isolate_->counters()->gc_scavenger() |
| 503 | : isolate_->counters()->gc_compactor(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 504 | rate->Start(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 505 | next_gc_likely_to_collect_more = |
| 506 | PerformGarbageCollection(collector, &tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 507 | rate->Stop(); |
| 508 | |
| 509 | GarbageCollectionEpilogue(); |
| 510 | } |
| 511 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 512 | ASSERT(collector == SCAVENGER || incremental_marking()->IsStopped()); |
| 513 | if (incremental_marking()->IsStopped()) { |
| 514 | if (incremental_marking()->WorthActivating() && NextGCIsLikelyToBeFull()) { |
| 515 | incremental_marking()->Start(); |
| 516 | } |
| 517 | } |
| 518 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 519 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 523 | void Heap::PerformScavenge() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 524 | GCTracer tracer(this); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 525 | if (incremental_marking()->IsStopped()) { |
| 526 | PerformGarbageCollection(SCAVENGER, &tracer); |
| 527 | } else { |
| 528 | PerformGarbageCollection(MARK_COMPACTOR, &tracer); |
| 529 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 533 | #ifdef DEBUG |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 534 | // Helper class for verifying the symbol table. |
| 535 | class SymbolTableVerifier : public ObjectVisitor { |
| 536 | public: |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 537 | void VisitPointers(Object** start, Object** end) { |
| 538 | // Visit all HeapObject pointers in [start, end). |
| 539 | for (Object** p = start; p < end; p++) { |
| 540 | if ((*p)->IsHeapObject()) { |
| 541 | // Check that the symbol is actually a symbol. |
| 542 | ASSERT((*p)->IsNull() || (*p)->IsUndefined() || (*p)->IsSymbol()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 543 | } |
| 544 | } |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 545 | } |
| 546 | }; |
| 547 | #endif // DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 548 | |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 549 | |
| 550 | static void VerifySymbolTable() { |
| 551 | #ifdef DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 552 | SymbolTableVerifier verifier; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 553 | HEAP->symbol_table()->IterateElements(&verifier); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 554 | #endif // DEBUG |
| 555 | } |
| 556 | |
| 557 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 558 | void Heap::ReserveSpace( |
| 559 | int new_space_size, |
| 560 | int pointer_space_size, |
| 561 | int data_space_size, |
| 562 | int code_space_size, |
| 563 | int map_space_size, |
| 564 | int cell_space_size, |
| 565 | int large_object_size) { |
| 566 | NewSpace* new_space = Heap::new_space(); |
| 567 | PagedSpace* old_pointer_space = Heap::old_pointer_space(); |
| 568 | PagedSpace* old_data_space = Heap::old_data_space(); |
| 569 | PagedSpace* code_space = Heap::code_space(); |
| 570 | PagedSpace* map_space = Heap::map_space(); |
| 571 | PagedSpace* cell_space = Heap::cell_space(); |
| 572 | LargeObjectSpace* lo_space = Heap::lo_space(); |
| 573 | bool gc_performed = true; |
| 574 | while (gc_performed) { |
| 575 | gc_performed = false; |
| 576 | if (!new_space->ReserveSpace(new_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 577 | Heap::CollectGarbage(NEW_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 578 | gc_performed = true; |
| 579 | } |
| 580 | if (!old_pointer_space->ReserveSpace(pointer_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 581 | Heap::CollectGarbage(OLD_POINTER_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 582 | gc_performed = true; |
| 583 | } |
| 584 | if (!(old_data_space->ReserveSpace(data_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 585 | Heap::CollectGarbage(OLD_DATA_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 586 | gc_performed = true; |
| 587 | } |
| 588 | if (!(code_space->ReserveSpace(code_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 589 | Heap::CollectGarbage(CODE_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 590 | gc_performed = true; |
| 591 | } |
| 592 | if (!(map_space->ReserveSpace(map_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 593 | Heap::CollectGarbage(MAP_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 594 | gc_performed = true; |
| 595 | } |
| 596 | if (!(cell_space->ReserveSpace(cell_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 597 | Heap::CollectGarbage(CELL_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 598 | gc_performed = true; |
| 599 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 600 | // We add a slack-factor of 2 in order to have space for a series of |
| 601 | // 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] | 602 | large_object_size *= 2; |
| 603 | // The ReserveSpace method on the large object space checks how much |
| 604 | // we can expand the old generation. This includes expansion caused by |
| 605 | // allocation in the other spaces. |
| 606 | large_object_size += cell_space_size + map_space_size + code_space_size + |
| 607 | data_space_size + pointer_space_size; |
| 608 | if (!(lo_space->ReserveSpace(large_object_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 609 | Heap::CollectGarbage(LO_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 610 | gc_performed = true; |
| 611 | } |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 616 | void Heap::EnsureFromSpaceIsCommitted() { |
| 617 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 618 | |
| 619 | // Committing memory to from space failed. |
| 620 | // Try shrinking and try again. |
| 621 | Shrink(); |
| 622 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 623 | |
| 624 | // Committing memory to from space failed again. |
| 625 | // Memory is exhausted and we will die. |
| 626 | V8::FatalProcessOutOfMemory("Committing semi space failed."); |
| 627 | } |
| 628 | |
| 629 | |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 630 | void Heap::ClearJSFunctionResultCaches() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 631 | if (isolate_->bootstrapper()->IsActive()) return; |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 632 | |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 633 | Object* context = global_contexts_list_; |
| 634 | while (!context->IsUndefined()) { |
| 635 | // Get the caches for this context: |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 636 | FixedArray* caches = |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 637 | Context::cast(context)->jsfunction_result_caches(); |
| 638 | // Clear the caches: |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 639 | int length = caches->length(); |
| 640 | for (int i = 0; i < length; i++) { |
| 641 | JSFunctionResultCache::cast(caches->get(i))->Clear(); |
| 642 | } |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 643 | // Get the next context: |
| 644 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 645 | } |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 646 | } |
| 647 | |
| 648 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 649 | |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 650 | void Heap::ClearNormalizedMapCaches() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 651 | if (isolate_->bootstrapper()->IsActive() && |
| 652 | !incremental_marking()->IsMarking()) { |
| 653 | return; |
| 654 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 655 | |
| 656 | Object* context = global_contexts_list_; |
| 657 | while (!context->IsUndefined()) { |
| 658 | Context::cast(context)->normalized_map_cache()->Clear(); |
| 659 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 660 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 664 | void Heap::UpdateSurvivalRateTrend(int start_new_space_size) { |
| 665 | double survival_rate = |
| 666 | (static_cast<double>(young_survivors_after_last_gc_) * 100) / |
| 667 | start_new_space_size; |
| 668 | |
| 669 | if (survival_rate > kYoungSurvivalRateThreshold) { |
| 670 | high_survival_rate_period_length_++; |
| 671 | } else { |
| 672 | high_survival_rate_period_length_ = 0; |
| 673 | } |
| 674 | |
| 675 | double survival_rate_diff = survival_rate_ - survival_rate; |
| 676 | |
| 677 | if (survival_rate_diff > kYoungSurvivalRateAllowedDeviation) { |
| 678 | set_survival_rate_trend(DECREASING); |
| 679 | } else if (survival_rate_diff < -kYoungSurvivalRateAllowedDeviation) { |
| 680 | set_survival_rate_trend(INCREASING); |
| 681 | } else { |
| 682 | set_survival_rate_trend(STABLE); |
| 683 | } |
| 684 | |
| 685 | survival_rate_ = survival_rate; |
| 686 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 687 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 688 | bool Heap::PerformGarbageCollection(GarbageCollector collector, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 689 | GCTracer* tracer) { |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 690 | bool next_gc_likely_to_collect_more = false; |
| 691 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 692 | if (collector != SCAVENGER) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 693 | PROFILE(isolate_, CodeMovingGCEvent()); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 694 | } |
| 695 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 696 | if (FLAG_verify_heap) { |
| 697 | VerifySymbolTable(); |
| 698 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 699 | if (collector == MARK_COMPACTOR && global_gc_prologue_callback_) { |
| 700 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 701 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 702 | global_gc_prologue_callback_(); |
| 703 | } |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 704 | |
| 705 | GCType gc_type = |
| 706 | collector == MARK_COMPACTOR ? kGCTypeMarkSweepCompact : kGCTypeScavenge; |
| 707 | |
| 708 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 709 | if (gc_type & gc_prologue_callbacks_[i].gc_type) { |
| 710 | gc_prologue_callbacks_[i].callback(gc_type, kNoGCCallbackFlags); |
| 711 | } |
| 712 | } |
| 713 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 714 | EnsureFromSpaceIsCommitted(); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 715 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 716 | int start_new_space_size = Heap::new_space()->SizeAsInt(); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 717 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 718 | if (IsHighSurvivalRate()) { |
| 719 | // We speed up the incremental marker if it is running so that it |
| 720 | // does not fall behind the rate of promotion, which would cause a |
| 721 | // constantly growing old space. |
| 722 | incremental_marking()->NotifyOfHighPromotionRate(); |
| 723 | } |
| 724 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 725 | if (collector == MARK_COMPACTOR) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 726 | // Perform mark-sweep with optional compaction. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 727 | MarkCompact(tracer); |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 728 | sweep_generation_++; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 729 | bool high_survival_rate_during_scavenges = IsHighSurvivalRate() && |
| 730 | IsStableOrIncreasingSurvivalTrend(); |
| 731 | |
| 732 | UpdateSurvivalRateTrend(start_new_space_size); |
| 733 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 734 | size_of_old_gen_at_last_old_space_gc_ = PromotedSpaceSize(); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 735 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 736 | if (high_survival_rate_during_scavenges && |
| 737 | IsStableOrIncreasingSurvivalTrend()) { |
| 738 | // Stable high survival rates of young objects both during partial and |
| 739 | // full collection indicate that mutator is either building or modifying |
| 740 | // a structure with a long lifetime. |
| 741 | // In this case we aggressively raise old generation memory limits to |
| 742 | // postpone subsequent mark-sweep collection and thus trade memory |
| 743 | // space for the mutation speed. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 744 | old_gen_limit_factor_ = 2; |
| 745 | } else { |
| 746 | old_gen_limit_factor_ = 1; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 747 | } |
| 748 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 749 | old_gen_promotion_limit_ = |
| 750 | OldGenPromotionLimit(size_of_old_gen_at_last_old_space_gc_); |
| 751 | old_gen_allocation_limit_ = |
| 752 | OldGenAllocationLimit(size_of_old_gen_at_last_old_space_gc_); |
| 753 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 754 | old_gen_exhausted_ = false; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 755 | } else { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 756 | tracer_ = tracer; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 757 | Scavenge(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 758 | tracer_ = NULL; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 759 | |
| 760 | UpdateSurvivalRateTrend(start_new_space_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 761 | } |
ager@chromium.org | 439e85a | 2009-08-26 13:15:29 +0000 | [diff] [blame] | 762 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 763 | isolate_->counters()->objs_since_last_young()->Set(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 764 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 765 | gc_post_processing_depth_++; |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 766 | { DisableAssertNoAllocation allow_allocation; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 767 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 768 | next_gc_likely_to_collect_more = |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 769 | isolate_->global_handles()->PostGarbageCollectionProcessing(collector); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 770 | } |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 771 | gc_post_processing_depth_--; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 772 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 773 | // Update relocatables. |
| 774 | Relocatable::PostGarbageCollectionProcessing(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 775 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 776 | if (collector == MARK_COMPACTOR) { |
| 777 | // Register the amount of external allocated memory. |
| 778 | amount_of_external_allocated_memory_at_last_global_gc_ = |
| 779 | amount_of_external_allocated_memory_; |
| 780 | } |
| 781 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 782 | GCCallbackFlags callback_flags = kNoGCCallbackFlags; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 783 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 784 | if (gc_type & gc_epilogue_callbacks_[i].gc_type) { |
| 785 | gc_epilogue_callbacks_[i].callback(gc_type, callback_flags); |
| 786 | } |
| 787 | } |
| 788 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 789 | if (collector == MARK_COMPACTOR && global_gc_epilogue_callback_) { |
| 790 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 791 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 792 | global_gc_epilogue_callback_(); |
| 793 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 794 | if (FLAG_verify_heap) { |
| 795 | VerifySymbolTable(); |
| 796 | } |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 797 | |
| 798 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 802 | void Heap::MarkCompact(GCTracer* tracer) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 803 | gc_state_ = MARK_COMPACT; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 804 | LOG(isolate_, ResourceEvent("markcompact", "begin")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 805 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 806 | mark_compact_collector_.Prepare(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 807 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 808 | ms_count_++; |
| 809 | tracer->set_full_gc_count(ms_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 810 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 811 | MarkCompactPrologue(); |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 812 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 813 | mark_compact_collector_.CollectGarbage(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 814 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 815 | LOG(isolate_, ResourceEvent("markcompact", "end")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 816 | |
| 817 | gc_state_ = NOT_IN_GC; |
| 818 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 819 | isolate_->counters()->objs_since_last_full()->Set(0); |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 820 | |
| 821 | contexts_disposed_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 825 | void Heap::MarkCompactPrologue() { |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 826 | // At any old GC clear the keyed lookup cache to enable collection of unused |
| 827 | // maps. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 828 | isolate_->keyed_lookup_cache()->Clear(); |
| 829 | isolate_->context_slot_cache()->Clear(); |
| 830 | isolate_->descriptor_lookup_cache()->Clear(); |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 831 | StringSplitCache::Clear(string_split_cache()); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 832 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 833 | isolate_->compilation_cache()->MarkCompactPrologue(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 834 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 835 | CompletelyClearInstanceofCache(); |
| 836 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 837 | // TODO(1605) select heuristic for flushing NumberString cache with |
| 838 | // FlushNumberStringCache |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 839 | if (FLAG_cleanup_code_caches_at_gc) { |
| 840 | polymorphic_code_cache()->set_cache(undefined_value()); |
| 841 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 842 | |
| 843 | ClearNormalizedMapCaches(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 847 | Object* Heap::FindCodeObject(Address a) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 848 | return isolate()->inner_pointer_to_code_cache()-> |
| 849 | GcSafeFindCodeForInnerPointer(a); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | |
| 853 | // Helper class for copying HeapObjects |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 854 | class ScavengeVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 855 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 856 | explicit ScavengeVisitor(Heap* heap) : heap_(heap) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 857 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 858 | void VisitPointer(Object** p) { ScavengePointer(p); } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 859 | |
| 860 | void VisitPointers(Object** start, Object** end) { |
| 861 | // Copy all HeapObject pointers in [start, end) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 862 | for (Object** p = start; p < end; p++) ScavengePointer(p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 863 | } |
| 864 | |
| 865 | private: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 866 | void ScavengePointer(Object** p) { |
| 867 | Object* object = *p; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 868 | if (!heap_->InNewSpace(object)) return; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 869 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 870 | reinterpret_cast<HeapObject*>(object)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 871 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 872 | |
| 873 | Heap* heap_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 874 | }; |
| 875 | |
| 876 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 877 | #ifdef DEBUG |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 878 | // 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] | 879 | // new space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 880 | class VerifyNonPointerSpacePointersVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 881 | public: |
| 882 | void VisitPointers(Object** start, Object**end) { |
| 883 | for (Object** current = start; current < end; current++) { |
| 884 | if ((*current)->IsHeapObject()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 885 | ASSERT(!HEAP->InNewSpace(HeapObject::cast(*current))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 886 | } |
| 887 | } |
| 888 | } |
| 889 | }; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 890 | |
| 891 | |
| 892 | static void VerifyNonPointerSpacePointers() { |
| 893 | // Verify that there are no pointers to new space in spaces where we |
| 894 | // do not expect them. |
| 895 | VerifyNonPointerSpacePointersVisitor v; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 896 | HeapObjectIterator code_it(HEAP->code_space()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 897 | for (HeapObject* object = code_it.Next(); |
| 898 | object != NULL; object = code_it.Next()) |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 899 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 900 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 901 | // The old data space was normally swept conservatively so that the iterator |
| 902 | // doesn't work, so we normally skip the next bit. |
| 903 | if (!HEAP->old_data_space()->was_swept_conservatively()) { |
| 904 | HeapObjectIterator data_it(HEAP->old_data_space()); |
| 905 | for (HeapObject* object = data_it.Next(); |
| 906 | object != NULL; object = data_it.Next()) |
| 907 | object->Iterate(&v); |
| 908 | } |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 909 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 910 | #endif |
| 911 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 912 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 913 | void Heap::CheckNewSpaceExpansionCriteria() { |
| 914 | if (new_space_.Capacity() < new_space_.MaximumCapacity() && |
| 915 | survived_since_last_expansion_ > new_space_.Capacity()) { |
| 916 | // Grow the size of new space if there is room to grow and enough |
| 917 | // data has survived scavenge since the last expansion. |
| 918 | new_space_.Grow(); |
| 919 | survived_since_last_expansion_ = 0; |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 924 | static bool IsUnscavengedHeapObject(Heap* heap, Object** p) { |
| 925 | return heap->InNewSpace(*p) && |
| 926 | !HeapObject::cast(*p)->map_word().IsForwardingAddress(); |
| 927 | } |
| 928 | |
| 929 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 930 | void Heap::ScavengeStoreBufferCallback( |
| 931 | Heap* heap, |
| 932 | MemoryChunk* page, |
| 933 | StoreBufferEvent event) { |
| 934 | heap->store_buffer_rebuilder_.Callback(page, event); |
| 935 | } |
| 936 | |
| 937 | |
| 938 | void StoreBufferRebuilder::Callback(MemoryChunk* page, StoreBufferEvent event) { |
| 939 | if (event == kStoreBufferStartScanningPagesEvent) { |
| 940 | start_of_current_page_ = NULL; |
| 941 | current_page_ = NULL; |
| 942 | } else if (event == kStoreBufferScanningPageEvent) { |
| 943 | if (current_page_ != NULL) { |
| 944 | // If this page already overflowed the store buffer during this iteration. |
| 945 | if (current_page_->scan_on_scavenge()) { |
| 946 | // Then we should wipe out the entries that have been added for it. |
| 947 | store_buffer_->SetTop(start_of_current_page_); |
| 948 | } else if (store_buffer_->Top() - start_of_current_page_ >= |
| 949 | (store_buffer_->Limit() - store_buffer_->Top()) >> 2) { |
| 950 | // Did we find too many pointers in the previous page? The heuristic is |
| 951 | // that no page can take more then 1/5 the remaining slots in the store |
| 952 | // buffer. |
| 953 | current_page_->set_scan_on_scavenge(true); |
| 954 | store_buffer_->SetTop(start_of_current_page_); |
| 955 | } else { |
| 956 | // In this case the page we scanned took a reasonable number of slots in |
| 957 | // the store buffer. It has now been rehabilitated and is no longer |
| 958 | // marked scan_on_scavenge. |
| 959 | ASSERT(!current_page_->scan_on_scavenge()); |
| 960 | } |
| 961 | } |
| 962 | start_of_current_page_ = store_buffer_->Top(); |
| 963 | current_page_ = page; |
| 964 | } else if (event == kStoreBufferFullEvent) { |
| 965 | // The current page overflowed the store buffer again. Wipe out its entries |
| 966 | // in the store buffer and mark it scan-on-scavenge again. This may happen |
| 967 | // several times while scanning. |
| 968 | if (current_page_ == NULL) { |
| 969 | // Store Buffer overflowed while scanning promoted objects. These are not |
| 970 | // in any particular page, though they are likely to be clustered by the |
| 971 | // allocation routines. |
| 972 | store_buffer_->HandleFullness(); |
| 973 | } else { |
| 974 | // Store Buffer overflowed while scanning a particular old space page for |
| 975 | // pointers to new space. |
| 976 | ASSERT(current_page_ == page); |
| 977 | ASSERT(page != NULL); |
| 978 | current_page_->set_scan_on_scavenge(true); |
| 979 | ASSERT(start_of_current_page_ != store_buffer_->Top()); |
| 980 | store_buffer_->SetTop(start_of_current_page_); |
| 981 | } |
| 982 | } else { |
| 983 | UNREACHABLE(); |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 988 | void Heap::Scavenge() { |
| 989 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 990 | if (FLAG_verify_heap) VerifyNonPointerSpacePointers(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 991 | #endif |
| 992 | |
| 993 | gc_state_ = SCAVENGE; |
| 994 | |
| 995 | // Implements Cheney's copying algorithm |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 996 | LOG(isolate_, ResourceEvent("scavenge", "begin")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 997 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 998 | // Clear descriptor cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 999 | isolate_->descriptor_lookup_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1000 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1001 | // Used for updating survived_since_last_expansion_ at function end. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 1002 | intptr_t survived_watermark = PromotedSpaceSize(); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1003 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1004 | CheckNewSpaceExpansionCriteria(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1005 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1006 | SelectScavengingVisitorsTable(); |
| 1007 | |
| 1008 | incremental_marking()->PrepareForScavenge(); |
| 1009 | |
| 1010 | old_pointer_space()->AdvanceSweeper(new_space_.Size()); |
| 1011 | old_data_space()->AdvanceSweeper(new_space_.Size()); |
| 1012 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1013 | // Flip the semispaces. After flipping, to space is empty, from space has |
| 1014 | // live objects. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1015 | new_space_.Flip(); |
| 1016 | new_space_.ResetAllocationInfo(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1017 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1018 | // We need to sweep newly copied objects which can be either in the |
| 1019 | // to space or promoted to the old generation. For to-space |
| 1020 | // objects, we treat the bottom of the to space as a queue. Newly |
| 1021 | // copied and unswept objects lie between a 'front' mark and the |
| 1022 | // allocation pointer. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1023 | // |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1024 | // Promoted objects can go into various old-generation spaces, and |
| 1025 | // can be allocated internally in the spaces (from the free list). |
| 1026 | // We treat the top of the to space as a queue of addresses of |
| 1027 | // promoted objects. The addresses of newly promoted and unswept |
| 1028 | // objects lie between a 'front' mark and a 'rear' mark that is |
| 1029 | // updated as a side effect of promoting an object. |
| 1030 | // |
| 1031 | // There is guaranteed to be enough room at the top of the to space |
| 1032 | // for the addresses of promoted objects: every object promoted |
| 1033 | // frees up its size in bytes from the top of the new space, and |
| 1034 | // objects are at least one pointer in size. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1035 | Address new_space_front = new_space_.ToSpaceStart(); |
| 1036 | promotion_queue_.Initialize(new_space_.ToSpaceEnd()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1037 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1038 | #ifdef DEBUG |
| 1039 | store_buffer()->Clean(); |
| 1040 | #endif |
| 1041 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1042 | ScavengeVisitor scavenge_visitor(this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1043 | // Copy roots. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1044 | IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1045 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1046 | // Copy objects reachable from the old generation. |
| 1047 | { |
| 1048 | StoreBufferRebuildScope scope(this, |
| 1049 | store_buffer(), |
| 1050 | &ScavengeStoreBufferCallback); |
| 1051 | store_buffer()->IteratePointersToNewSpace(&ScavengeObject); |
| 1052 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1053 | |
| 1054 | // Copy objects reachable from cells by scavenging cell values directly. |
| 1055 | HeapObjectIterator cell_iterator(cell_space_); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1056 | for (HeapObject* cell = cell_iterator.Next(); |
| 1057 | cell != NULL; cell = cell_iterator.Next()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1058 | if (cell->IsJSGlobalPropertyCell()) { |
| 1059 | Address value_address = |
| 1060 | reinterpret_cast<Address>(cell) + |
| 1061 | (JSGlobalPropertyCell::kValueOffset - kHeapObjectTag); |
| 1062 | scavenge_visitor.VisitPointer(reinterpret_cast<Object**>(value_address)); |
| 1063 | } |
| 1064 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1065 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1066 | // Scavenge object reachable from the global contexts list directly. |
| 1067 | scavenge_visitor.VisitPointer(BitCast<Object**>(&global_contexts_list_)); |
| 1068 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1069 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1070 | isolate_->global_handles()->IdentifyNewSpaceWeakIndependentHandles( |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 1071 | &IsUnscavengedHeapObject); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1072 | isolate_->global_handles()->IterateNewSpaceWeakIndependentRoots( |
| 1073 | &scavenge_visitor); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 1074 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
| 1075 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1076 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1077 | UpdateNewSpaceReferencesInExternalStringTable( |
| 1078 | &UpdateNewSpaceReferenceInExternalStringTableEntry); |
| 1079 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1080 | LiveObjectList::UpdateReferencesForScavengeGC(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1081 | isolate()->runtime_profiler()->UpdateSamplesAfterScavenge(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1082 | incremental_marking()->UpdateMarkingDequeAfterScavenge(); |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1083 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1084 | ASSERT(new_space_front == new_space_.top()); |
| 1085 | |
| 1086 | // Set age mark. |
| 1087 | new_space_.set_age_mark(new_space_.top()); |
| 1088 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1089 | new_space_.LowerInlineAllocationLimit( |
| 1090 | new_space_.inline_allocation_limit_step()); |
| 1091 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1092 | // Update how much has survived scavenge. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 1093 | IncrementYoungSurvivorsCounter(static_cast<int>( |
| 1094 | (PromotedSpaceSize() - survived_watermark) + new_space_.Size())); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1095 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1096 | LOG(isolate_, ResourceEvent("scavenge", "end")); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1097 | |
| 1098 | gc_state_ = NOT_IN_GC; |
| 1099 | } |
| 1100 | |
| 1101 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1102 | String* Heap::UpdateNewSpaceReferenceInExternalStringTableEntry(Heap* heap, |
| 1103 | Object** p) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1104 | MapWord first_word = HeapObject::cast(*p)->map_word(); |
| 1105 | |
| 1106 | if (!first_word.IsForwardingAddress()) { |
| 1107 | // Unreachable external string can be finalized. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1108 | heap->FinalizeExternalString(String::cast(*p)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1109 | return NULL; |
| 1110 | } |
| 1111 | |
| 1112 | // String is still reachable. |
| 1113 | return String::cast(first_word.ToForwardingAddress()); |
| 1114 | } |
| 1115 | |
| 1116 | |
| 1117 | void Heap::UpdateNewSpaceReferencesInExternalStringTable( |
| 1118 | ExternalStringTableUpdaterCallback updater_func) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 1119 | if (FLAG_verify_heap) { |
| 1120 | external_string_table_.Verify(); |
| 1121 | } |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1122 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1123 | if (external_string_table_.new_space_strings_.is_empty()) return; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1124 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1125 | Object** start = &external_string_table_.new_space_strings_[0]; |
| 1126 | Object** end = start + external_string_table_.new_space_strings_.length(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1127 | Object** last = start; |
| 1128 | |
| 1129 | for (Object** p = start; p < end; ++p) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1130 | ASSERT(InFromSpace(*p)); |
| 1131 | String* target = updater_func(this, p); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1132 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1133 | if (target == NULL) continue; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1134 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1135 | ASSERT(target->IsExternalString()); |
| 1136 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1137 | if (InNewSpace(target)) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1138 | // String is still in new space. Update the table entry. |
| 1139 | *last = target; |
| 1140 | ++last; |
| 1141 | } else { |
| 1142 | // String got promoted. Move it to the old string list. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1143 | external_string_table_.AddOldString(target); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1144 | } |
| 1145 | } |
| 1146 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1147 | ASSERT(last <= end); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1148 | external_string_table_.ShrinkNewStrings(static_cast<int>(last - start)); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1149 | } |
| 1150 | |
| 1151 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1152 | void Heap::UpdateReferencesInExternalStringTable( |
| 1153 | ExternalStringTableUpdaterCallback updater_func) { |
| 1154 | |
| 1155 | // Update old space string references. |
| 1156 | if (external_string_table_.old_space_strings_.length() > 0) { |
| 1157 | Object** start = &external_string_table_.old_space_strings_[0]; |
| 1158 | Object** end = start + external_string_table_.old_space_strings_.length(); |
| 1159 | for (Object** p = start; p < end; ++p) *p = updater_func(this, p); |
| 1160 | } |
| 1161 | |
| 1162 | UpdateNewSpaceReferencesInExternalStringTable(updater_func); |
| 1163 | } |
| 1164 | |
| 1165 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1166 | static Object* ProcessFunctionWeakReferences(Heap* heap, |
| 1167 | Object* function, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1168 | WeakObjectRetainer* retainer) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1169 | Object* undefined = heap->undefined_value(); |
| 1170 | Object* head = undefined; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1171 | JSFunction* tail = NULL; |
| 1172 | Object* candidate = function; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1173 | while (candidate != undefined) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1174 | // Check whether to keep the candidate in the list. |
| 1175 | JSFunction* candidate_function = reinterpret_cast<JSFunction*>(candidate); |
| 1176 | Object* retain = retainer->RetainAs(candidate); |
| 1177 | if (retain != NULL) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1178 | if (head == undefined) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1179 | // First element in the list. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1180 | head = retain; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1181 | } else { |
| 1182 | // Subsequent elements in the list. |
| 1183 | ASSERT(tail != NULL); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1184 | tail->set_next_function_link(retain); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1185 | } |
| 1186 | // Retained function is new tail. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1187 | candidate_function = reinterpret_cast<JSFunction*>(retain); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1188 | tail = candidate_function; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1189 | |
| 1190 | ASSERT(retain->IsUndefined() || retain->IsJSFunction()); |
| 1191 | |
| 1192 | if (retain == undefined) break; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1193 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1194 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1195 | // Move to next element in the list. |
| 1196 | candidate = candidate_function->next_function_link(); |
| 1197 | } |
| 1198 | |
| 1199 | // Terminate the list if there is one or more elements. |
| 1200 | if (tail != NULL) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1201 | tail->set_next_function_link(undefined); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | return head; |
| 1205 | } |
| 1206 | |
| 1207 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1208 | void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1209 | Object* undefined = undefined_value(); |
| 1210 | Object* head = undefined; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1211 | Context* tail = NULL; |
| 1212 | Object* candidate = global_contexts_list_; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1213 | while (candidate != undefined) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1214 | // Check whether to keep the candidate in the list. |
| 1215 | Context* candidate_context = reinterpret_cast<Context*>(candidate); |
| 1216 | Object* retain = retainer->RetainAs(candidate); |
| 1217 | if (retain != NULL) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1218 | if (head == undefined) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1219 | // First element in the list. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1220 | head = retain; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1221 | } else { |
| 1222 | // Subsequent elements in the list. |
| 1223 | ASSERT(tail != NULL); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1224 | tail->set_unchecked(this, |
| 1225 | Context::NEXT_CONTEXT_LINK, |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1226 | retain, |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1227 | UPDATE_WRITE_BARRIER); |
| 1228 | } |
| 1229 | // Retained context is new tail. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1230 | candidate_context = reinterpret_cast<Context*>(retain); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1231 | tail = candidate_context; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1232 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1233 | if (retain == undefined) break; |
| 1234 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1235 | // Process the weak list of optimized functions for the context. |
| 1236 | Object* function_list_head = |
| 1237 | ProcessFunctionWeakReferences( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1238 | this, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1239 | candidate_context->get(Context::OPTIMIZED_FUNCTIONS_LIST), |
| 1240 | retainer); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1241 | candidate_context->set_unchecked(this, |
| 1242 | Context::OPTIMIZED_FUNCTIONS_LIST, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1243 | function_list_head, |
| 1244 | UPDATE_WRITE_BARRIER); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1245 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1246 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1247 | // Move to next element in the list. |
| 1248 | candidate = candidate_context->get(Context::NEXT_CONTEXT_LINK); |
| 1249 | } |
| 1250 | |
| 1251 | // Terminate the list if there is one or more elements. |
| 1252 | if (tail != NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1253 | tail->set_unchecked(this, |
| 1254 | Context::NEXT_CONTEXT_LINK, |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1255 | Heap::undefined_value(), |
| 1256 | UPDATE_WRITE_BARRIER); |
| 1257 | } |
| 1258 | |
| 1259 | // Update the head of the list of contexts. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1260 | global_contexts_list_ = head; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1264 | class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> { |
| 1265 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1266 | static inline void VisitPointer(Heap* heap, Object** p) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1267 | Object* object = *p; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1268 | if (!heap->InNewSpace(object)) return; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1269 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 1270 | reinterpret_cast<HeapObject*>(object)); |
| 1271 | } |
| 1272 | }; |
| 1273 | |
| 1274 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1275 | Address Heap::DoScavenge(ObjectVisitor* scavenge_visitor, |
| 1276 | Address new_space_front) { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1277 | do { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1278 | SemiSpace::AssertValidRange(new_space_front, new_space_.top()); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1279 | // The addresses new_space_front and new_space_.top() define a |
| 1280 | // queue of unprocessed copied objects. Process them until the |
| 1281 | // queue is empty. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1282 | while (new_space_front != new_space_.top()) { |
| 1283 | if (!NewSpacePage::IsAtEnd(new_space_front)) { |
| 1284 | HeapObject* object = HeapObject::FromAddress(new_space_front); |
| 1285 | new_space_front += |
| 1286 | NewSpaceScavenger::IterateBody(object->map(), object); |
| 1287 | } else { |
| 1288 | new_space_front = |
| 1289 | NewSpacePage::FromLimit(new_space_front)->next_page()->body(); |
| 1290 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1291 | } |
| 1292 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1293 | // Promote and process all the to-be-promoted objects. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1294 | { |
| 1295 | StoreBufferRebuildScope scope(this, |
| 1296 | store_buffer(), |
| 1297 | &ScavengeStoreBufferCallback); |
| 1298 | while (!promotion_queue()->is_empty()) { |
| 1299 | HeapObject* target; |
| 1300 | int size; |
| 1301 | promotion_queue()->remove(&target, &size); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1302 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1303 | // Promoted object might be already partially visited |
| 1304 | // during old space pointer iteration. Thus we search specificly |
| 1305 | // for pointers to from semispace instead of looking for pointers |
| 1306 | // to new space. |
| 1307 | ASSERT(!target->IsMap()); |
| 1308 | IterateAndMarkPointersToFromSpace(target->address(), |
| 1309 | target->address() + size, |
| 1310 | &ScavengeObject); |
| 1311 | } |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1312 | } |
| 1313 | |
| 1314 | // Take another spin if there are now unswept objects in new space |
| 1315 | // (there are currently no more unswept promoted objects). |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1316 | } while (new_space_front != new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1317 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1318 | return new_space_front; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1319 | } |
| 1320 | |
| 1321 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1322 | enum LoggingAndProfiling { |
| 1323 | LOGGING_AND_PROFILING_ENABLED, |
| 1324 | LOGGING_AND_PROFILING_DISABLED |
| 1325 | }; |
| 1326 | |
| 1327 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1328 | enum MarksHandling { TRANSFER_MARKS, IGNORE_MARKS }; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1329 | |
| 1330 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1331 | template<MarksHandling marks_handling, |
| 1332 | LoggingAndProfiling logging_and_profiling_mode> |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1333 | class ScavengingVisitor : public StaticVisitorBase { |
| 1334 | public: |
| 1335 | static void Initialize() { |
| 1336 | table_.Register(kVisitSeqAsciiString, &EvacuateSeqAsciiString); |
| 1337 | table_.Register(kVisitSeqTwoByteString, &EvacuateSeqTwoByteString); |
| 1338 | table_.Register(kVisitShortcutCandidate, &EvacuateShortcutCandidate); |
| 1339 | table_.Register(kVisitByteArray, &EvacuateByteArray); |
| 1340 | table_.Register(kVisitFixedArray, &EvacuateFixedArray); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1341 | table_.Register(kVisitFixedDoubleArray, &EvacuateFixedDoubleArray); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1342 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1343 | table_.Register(kVisitGlobalContext, |
| 1344 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1345 | template VisitSpecialized<Context::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1346 | |
| 1347 | table_.Register(kVisitConsString, |
| 1348 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1349 | template VisitSpecialized<ConsString::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1350 | |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 1351 | table_.Register(kVisitSlicedString, |
| 1352 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1353 | template VisitSpecialized<SlicedString::kSize>); |
| 1354 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1355 | table_.Register(kVisitSharedFunctionInfo, |
| 1356 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1357 | template VisitSpecialized<SharedFunctionInfo::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1358 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 1359 | table_.Register(kVisitJSWeakMap, |
| 1360 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1361 | Visit); |
| 1362 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 1363 | table_.Register(kVisitJSRegExp, |
| 1364 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1365 | Visit); |
| 1366 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1367 | if (marks_handling == IGNORE_MARKS) { |
| 1368 | table_.Register(kVisitJSFunction, |
| 1369 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1370 | template VisitSpecialized<JSFunction::kSize>); |
| 1371 | } else { |
| 1372 | table_.Register(kVisitJSFunction, &EvacuateJSFunction); |
| 1373 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1374 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1375 | table_.RegisterSpecializations<ObjectEvacuationStrategy<DATA_OBJECT>, |
| 1376 | kVisitDataObject, |
| 1377 | kVisitDataObjectGeneric>(); |
| 1378 | |
| 1379 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1380 | kVisitJSObject, |
| 1381 | kVisitJSObjectGeneric>(); |
| 1382 | |
| 1383 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1384 | kVisitStruct, |
| 1385 | kVisitStructGeneric>(); |
| 1386 | } |
| 1387 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1388 | static VisitorDispatchTable<ScavengingCallback>* GetTable() { |
| 1389 | return &table_; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1390 | } |
| 1391 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1392 | private: |
| 1393 | enum ObjectContents { DATA_OBJECT, POINTER_OBJECT }; |
| 1394 | enum SizeRestriction { SMALL, UNKNOWN_SIZE }; |
| 1395 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1396 | static void RecordCopiedObject(Heap* heap, HeapObject* obj) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1397 | bool should_record = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1398 | #ifdef DEBUG |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1399 | should_record = FLAG_heap_stats; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1400 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1401 | should_record = should_record || FLAG_log_gc; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1402 | if (should_record) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1403 | if (heap->new_space()->Contains(obj)) { |
| 1404 | heap->new_space()->RecordAllocation(obj); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1405 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1406 | heap->new_space()->RecordPromotion(obj); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1407 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1408 | } |
| 1409 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1410 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1411 | // Helper function used by CopyObject to copy a source object to an |
| 1412 | // allocated target object and update the forwarding pointer in the source |
| 1413 | // object. Returns the target object. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1414 | INLINE(static HeapObject* MigrateObject(Heap* heap, |
| 1415 | HeapObject* source, |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1416 | HeapObject* target, |
| 1417 | int size)) { |
| 1418 | // Copy the content of source to target. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1419 | heap->CopyBlock(target->address(), source->address(), size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1420 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1421 | // Set the forwarding address. |
| 1422 | source->set_map_word(MapWord::FromForwardingAddress(target)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1423 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1424 | if (logging_and_profiling_mode == LOGGING_AND_PROFILING_ENABLED) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1425 | // Update NewSpace stats if necessary. |
| 1426 | RecordCopiedObject(heap, target); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1427 | HEAP_PROFILE(heap, ObjectMoveEvent(source->address(), target->address())); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1428 | Isolate* isolate = heap->isolate(); |
| 1429 | if (isolate->logger()->is_logging() || |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1430 | CpuProfiler::is_profiling(isolate)) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1431 | if (target->IsSharedFunctionInfo()) { |
| 1432 | PROFILE(isolate, SharedFunctionInfoMoveEvent( |
| 1433 | source->address(), target->address())); |
| 1434 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 1435 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1436 | } |
| 1437 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1438 | if (marks_handling == TRANSFER_MARKS) { |
| 1439 | if (Marking::TransferColor(source, target)) { |
| 1440 | MemoryChunk::IncrementLiveBytes(target->address(), size); |
| 1441 | } |
| 1442 | } |
| 1443 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1444 | return target; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1445 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1446 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1447 | template<ObjectContents object_contents, SizeRestriction size_restriction> |
| 1448 | static inline void EvacuateObject(Map* map, |
| 1449 | HeapObject** slot, |
| 1450 | HeapObject* object, |
| 1451 | int object_size) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 1452 | SLOW_ASSERT((size_restriction != SMALL) || |
| 1453 | (object_size <= Page::kMaxHeapObjectSize)); |
| 1454 | SLOW_ASSERT(object->Size() == object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1455 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1456 | Heap* heap = map->GetHeap(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1457 | if (heap->ShouldBePromoted(object->address(), object_size)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1458 | MaybeObject* maybe_result; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1459 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1460 | if ((size_restriction != SMALL) && |
| 1461 | (object_size > Page::kMaxHeapObjectSize)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1462 | maybe_result = heap->lo_space()->AllocateRaw(object_size, |
| 1463 | NOT_EXECUTABLE); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1464 | } else { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1465 | if (object_contents == DATA_OBJECT) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1466 | maybe_result = heap->old_data_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1467 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1468 | maybe_result = heap->old_pointer_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1469 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1470 | } |
| 1471 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1472 | Object* result = NULL; // Initialization to please compiler. |
| 1473 | if (maybe_result->ToObject(&result)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1474 | HeapObject* target = HeapObject::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1475 | *slot = MigrateObject(heap, object , target, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1476 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1477 | if (object_contents == POINTER_OBJECT) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1478 | heap->promotion_queue()->insert(target, object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1479 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1480 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1481 | heap->tracer()->increment_promoted_objects_size(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1482 | return; |
| 1483 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1484 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1485 | MaybeObject* allocation = heap->new_space()->AllocateRaw(object_size); |
| 1486 | Object* result = allocation->ToObjectUnchecked(); |
| 1487 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1488 | *slot = MigrateObject(heap, object, HeapObject::cast(result), object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1489 | return; |
| 1490 | } |
| 1491 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1492 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1493 | static inline void EvacuateJSFunction(Map* map, |
| 1494 | HeapObject** slot, |
| 1495 | HeapObject* object) { |
| 1496 | ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1497 | template VisitSpecialized<JSFunction::kSize>(map, slot, object); |
| 1498 | |
| 1499 | HeapObject* target = *slot; |
| 1500 | MarkBit mark_bit = Marking::MarkBitFrom(target); |
| 1501 | if (Marking::IsBlack(mark_bit)) { |
| 1502 | // This object is black and it might not be rescanned by marker. |
| 1503 | // We should explicitly record code entry slot for compaction because |
| 1504 | // promotion queue processing (IterateAndMarkPointersToFromSpace) will |
| 1505 | // miss it as it is not HeapObject-tagged. |
| 1506 | Address code_entry_slot = |
| 1507 | target->address() + JSFunction::kCodeEntryOffset; |
| 1508 | Code* code = Code::cast(Code::GetObjectFromEntryAddress(code_entry_slot)); |
| 1509 | map->GetHeap()->mark_compact_collector()-> |
| 1510 | RecordCodeEntrySlot(code_entry_slot, code); |
| 1511 | } |
| 1512 | } |
| 1513 | |
| 1514 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1515 | static inline void EvacuateFixedArray(Map* map, |
| 1516 | HeapObject** slot, |
| 1517 | HeapObject* object) { |
| 1518 | int object_size = FixedArray::BodyDescriptor::SizeOf(map, object); |
| 1519 | EvacuateObject<POINTER_OBJECT, UNKNOWN_SIZE>(map, |
| 1520 | slot, |
| 1521 | object, |
| 1522 | object_size); |
| 1523 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1524 | |
| 1525 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1526 | static inline void EvacuateFixedDoubleArray(Map* map, |
| 1527 | HeapObject** slot, |
| 1528 | HeapObject* object) { |
| 1529 | int length = reinterpret_cast<FixedDoubleArray*>(object)->length(); |
| 1530 | int object_size = FixedDoubleArray::SizeFor(length); |
| 1531 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, |
| 1532 | slot, |
| 1533 | object, |
| 1534 | object_size); |
| 1535 | } |
| 1536 | |
| 1537 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1538 | static inline void EvacuateByteArray(Map* map, |
| 1539 | HeapObject** slot, |
| 1540 | HeapObject* object) { |
| 1541 | int object_size = reinterpret_cast<ByteArray*>(object)->ByteArraySize(); |
| 1542 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1543 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1544 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1545 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1546 | static inline void EvacuateSeqAsciiString(Map* map, |
| 1547 | HeapObject** slot, |
| 1548 | HeapObject* object) { |
| 1549 | int object_size = SeqAsciiString::cast(object)-> |
| 1550 | SeqAsciiStringSize(map->instance_type()); |
| 1551 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1552 | } |
| 1553 | |
| 1554 | |
| 1555 | static inline void EvacuateSeqTwoByteString(Map* map, |
| 1556 | HeapObject** slot, |
| 1557 | HeapObject* object) { |
| 1558 | int object_size = SeqTwoByteString::cast(object)-> |
| 1559 | SeqTwoByteStringSize(map->instance_type()); |
| 1560 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1561 | } |
| 1562 | |
| 1563 | |
| 1564 | static inline bool IsShortcutCandidate(int type) { |
| 1565 | return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| 1566 | } |
| 1567 | |
| 1568 | static inline void EvacuateShortcutCandidate(Map* map, |
| 1569 | HeapObject** slot, |
| 1570 | HeapObject* object) { |
| 1571 | ASSERT(IsShortcutCandidate(map->instance_type())); |
| 1572 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1573 | Heap* heap = map->GetHeap(); |
| 1574 | |
| 1575 | if (marks_handling == IGNORE_MARKS && |
| 1576 | ConsString::cast(object)->unchecked_second() == |
| 1577 | heap->empty_string()) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1578 | HeapObject* first = |
| 1579 | HeapObject::cast(ConsString::cast(object)->unchecked_first()); |
| 1580 | |
| 1581 | *slot = first; |
| 1582 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1583 | if (!heap->InNewSpace(first)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1584 | object->set_map_word(MapWord::FromForwardingAddress(first)); |
| 1585 | return; |
| 1586 | } |
| 1587 | |
| 1588 | MapWord first_word = first->map_word(); |
| 1589 | if (first_word.IsForwardingAddress()) { |
| 1590 | HeapObject* target = first_word.ToForwardingAddress(); |
| 1591 | |
| 1592 | *slot = target; |
| 1593 | object->set_map_word(MapWord::FromForwardingAddress(target)); |
| 1594 | return; |
| 1595 | } |
| 1596 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1597 | heap->DoScavengeObject(first->map(), slot, first); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1598 | object->set_map_word(MapWord::FromForwardingAddress(*slot)); |
| 1599 | return; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1600 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1601 | |
| 1602 | int object_size = ConsString::kSize; |
| 1603 | EvacuateObject<POINTER_OBJECT, SMALL>(map, slot, object, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1604 | } |
| 1605 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1606 | template<ObjectContents object_contents> |
| 1607 | class ObjectEvacuationStrategy { |
| 1608 | public: |
| 1609 | template<int object_size> |
| 1610 | static inline void VisitSpecialized(Map* map, |
| 1611 | HeapObject** slot, |
| 1612 | HeapObject* object) { |
| 1613 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1614 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1615 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1616 | static inline void Visit(Map* map, |
| 1617 | HeapObject** slot, |
| 1618 | HeapObject* object) { |
| 1619 | int object_size = map->instance_size(); |
| 1620 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1621 | } |
| 1622 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1623 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1624 | static VisitorDispatchTable<ScavengingCallback> table_; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1625 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1626 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1627 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1628 | template<MarksHandling marks_handling, |
| 1629 | LoggingAndProfiling logging_and_profiling_mode> |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1630 | VisitorDispatchTable<ScavengingCallback> |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1631 | ScavengingVisitor<marks_handling, logging_and_profiling_mode>::table_; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1632 | |
| 1633 | |
| 1634 | static void InitializeScavengingVisitorsTables() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1635 | ScavengingVisitor<TRANSFER_MARKS, |
| 1636 | LOGGING_AND_PROFILING_DISABLED>::Initialize(); |
| 1637 | ScavengingVisitor<IGNORE_MARKS, LOGGING_AND_PROFILING_DISABLED>::Initialize(); |
| 1638 | ScavengingVisitor<TRANSFER_MARKS, |
| 1639 | LOGGING_AND_PROFILING_ENABLED>::Initialize(); |
| 1640 | ScavengingVisitor<IGNORE_MARKS, LOGGING_AND_PROFILING_ENABLED>::Initialize(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1641 | } |
| 1642 | |
| 1643 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1644 | void Heap::SelectScavengingVisitorsTable() { |
| 1645 | bool logging_and_profiling = |
| 1646 | isolate()->logger()->is_logging() || |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1647 | CpuProfiler::is_profiling(isolate()) || |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1648 | (isolate()->heap_profiler() != NULL && |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1649 | isolate()->heap_profiler()->is_profiling()); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1650 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1651 | if (!incremental_marking()->IsMarking()) { |
| 1652 | if (!logging_and_profiling) { |
| 1653 | scavenging_visitors_table_.CopyFrom( |
| 1654 | ScavengingVisitor<IGNORE_MARKS, |
| 1655 | LOGGING_AND_PROFILING_DISABLED>::GetTable()); |
| 1656 | } else { |
| 1657 | scavenging_visitors_table_.CopyFrom( |
| 1658 | ScavengingVisitor<IGNORE_MARKS, |
| 1659 | LOGGING_AND_PROFILING_ENABLED>::GetTable()); |
| 1660 | } |
| 1661 | } else { |
| 1662 | if (!logging_and_profiling) { |
| 1663 | scavenging_visitors_table_.CopyFrom( |
| 1664 | ScavengingVisitor<TRANSFER_MARKS, |
| 1665 | LOGGING_AND_PROFILING_DISABLED>::GetTable()); |
| 1666 | } else { |
| 1667 | scavenging_visitors_table_.CopyFrom( |
| 1668 | ScavengingVisitor<TRANSFER_MARKS, |
| 1669 | LOGGING_AND_PROFILING_ENABLED>::GetTable()); |
| 1670 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 1671 | |
| 1672 | if (incremental_marking()->IsCompacting()) { |
| 1673 | // When compacting forbid short-circuiting of cons-strings. |
| 1674 | // Scavenging code relies on the fact that new space object |
| 1675 | // can't be evacuated into evacuation candidate but |
| 1676 | // short-circuiting violates this assumption. |
| 1677 | scavenging_visitors_table_.Register( |
| 1678 | StaticVisitorBase::kVisitShortcutCandidate, |
| 1679 | scavenging_visitors_table_.GetVisitorById( |
| 1680 | StaticVisitorBase::kVisitConsString)); |
| 1681 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1682 | } |
| 1683 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1684 | |
| 1685 | |
| 1686 | void Heap::ScavengeObjectSlow(HeapObject** p, HeapObject* object) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 1687 | SLOW_ASSERT(HEAP->InFromSpace(object)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1688 | MapWord first_word = object->map_word(); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 1689 | SLOW_ASSERT(!first_word.IsForwardingAddress()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1690 | Map* map = first_word.ToMap(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1691 | map->GetHeap()->DoScavengeObject(map, p, object); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1692 | } |
| 1693 | |
| 1694 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1695 | MaybeObject* Heap::AllocatePartialMap(InstanceType instance_type, |
| 1696 | int instance_size) { |
| 1697 | Object* result; |
| 1698 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1699 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1700 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1701 | |
| 1702 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1703 | reinterpret_cast<Map*>(result)->set_map(raw_unchecked_meta_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1704 | reinterpret_cast<Map*>(result)->set_instance_type(instance_type); |
| 1705 | reinterpret_cast<Map*>(result)->set_instance_size(instance_size); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1706 | reinterpret_cast<Map*>(result)->set_visitor_id( |
| 1707 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1708 | reinterpret_cast<Map*>(result)->set_inobject_properties(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1709 | reinterpret_cast<Map*>(result)->set_pre_allocated_property_fields(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1710 | reinterpret_cast<Map*>(result)->set_unused_property_fields(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1711 | reinterpret_cast<Map*>(result)->set_bit_field(0); |
| 1712 | reinterpret_cast<Map*>(result)->set_bit_field2(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1713 | return result; |
| 1714 | } |
| 1715 | |
| 1716 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1717 | MaybeObject* Heap::AllocateMap(InstanceType instance_type, |
| 1718 | int instance_size, |
| 1719 | ElementsKind elements_kind) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1720 | Object* result; |
| 1721 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1722 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1723 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1724 | |
| 1725 | Map* map = reinterpret_cast<Map*>(result); |
| 1726 | map->set_map(meta_map()); |
| 1727 | map->set_instance_type(instance_type); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1728 | map->set_visitor_id( |
| 1729 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1730 | map->set_prototype(null_value()); |
| 1731 | map->set_constructor(null_value()); |
| 1732 | map->set_instance_size(instance_size); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1733 | map->set_inobject_properties(0); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1734 | map->set_pre_allocated_property_fields(0); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1735 | map->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1736 | map->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1737 | map->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1738 | map->set_unused_property_fields(0); |
| 1739 | map->set_bit_field(0); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1740 | map->set_bit_field2(1 << Map::kIsExtensible); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1741 | map->set_elements_kind(elements_kind); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 1742 | |
| 1743 | // If the map object is aligned fill the padding area with Smi 0 objects. |
| 1744 | if (Map::kPadStart < Map::kSize) { |
| 1745 | memset(reinterpret_cast<byte*>(map) + Map::kPadStart - kHeapObjectTag, |
| 1746 | 0, |
| 1747 | Map::kSize - Map::kPadStart); |
| 1748 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1749 | return map; |
| 1750 | } |
| 1751 | |
| 1752 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1753 | MaybeObject* Heap::AllocateCodeCache() { |
| 1754 | Object* result; |
| 1755 | { MaybeObject* maybe_result = AllocateStruct(CODE_CACHE_TYPE); |
| 1756 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1757 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1758 | CodeCache* code_cache = CodeCache::cast(result); |
| 1759 | code_cache->set_default_cache(empty_fixed_array()); |
| 1760 | code_cache->set_normal_type_cache(undefined_value()); |
| 1761 | return code_cache; |
| 1762 | } |
| 1763 | |
| 1764 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1765 | MaybeObject* Heap::AllocatePolymorphicCodeCache() { |
| 1766 | return AllocateStruct(POLYMORPHIC_CODE_CACHE_TYPE); |
| 1767 | } |
| 1768 | |
| 1769 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1770 | const Heap::StringTypeTable Heap::string_type_table[] = { |
| 1771 | #define STRING_TYPE_ELEMENT(type, size, name, camel_name) \ |
| 1772 | {type, size, k##camel_name##MapRootIndex}, |
| 1773 | STRING_TYPE_LIST(STRING_TYPE_ELEMENT) |
| 1774 | #undef STRING_TYPE_ELEMENT |
| 1775 | }; |
| 1776 | |
| 1777 | |
| 1778 | const Heap::ConstantSymbolTable Heap::constant_symbol_table[] = { |
| 1779 | #define CONSTANT_SYMBOL_ELEMENT(name, contents) \ |
| 1780 | {contents, k##name##RootIndex}, |
| 1781 | SYMBOL_LIST(CONSTANT_SYMBOL_ELEMENT) |
| 1782 | #undef CONSTANT_SYMBOL_ELEMENT |
| 1783 | }; |
| 1784 | |
| 1785 | |
| 1786 | const Heap::StructTable Heap::struct_table[] = { |
| 1787 | #define STRUCT_TABLE_ELEMENT(NAME, Name, name) \ |
| 1788 | { NAME##_TYPE, Name::kSize, k##Name##MapRootIndex }, |
| 1789 | STRUCT_LIST(STRUCT_TABLE_ELEMENT) |
| 1790 | #undef STRUCT_TABLE_ELEMENT |
| 1791 | }; |
| 1792 | |
| 1793 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1794 | bool Heap::CreateInitialMaps() { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1795 | Object* obj; |
| 1796 | { MaybeObject* maybe_obj = AllocatePartialMap(MAP_TYPE, Map::kSize); |
| 1797 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1798 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1799 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1800 | Map* new_meta_map = reinterpret_cast<Map*>(obj); |
| 1801 | set_meta_map(new_meta_map); |
| 1802 | new_meta_map->set_map(new_meta_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1803 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1804 | { MaybeObject* maybe_obj = |
| 1805 | AllocatePartialMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1806 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1807 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1808 | set_fixed_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1809 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1810 | { MaybeObject* maybe_obj = AllocatePartialMap(ODDBALL_TYPE, Oddball::kSize); |
| 1811 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1812 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1813 | set_oddball_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1814 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 1815 | // Allocate the empty array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1816 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1817 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1818 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1819 | set_empty_fixed_array(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1820 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1821 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1822 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1823 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 1824 | set_null_value(Oddball::cast(obj)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1825 | Oddball::cast(obj)->set_kind(Oddball::kNull); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1826 | |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 1827 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_POINTER_SPACE); |
| 1828 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1829 | } |
| 1830 | set_undefined_value(Oddball::cast(obj)); |
| 1831 | Oddball::cast(obj)->set_kind(Oddball::kUndefined); |
| 1832 | ASSERT(!InNewSpace(undefined_value())); |
| 1833 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1834 | // Allocate the empty descriptor array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1835 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1836 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1837 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1838 | set_empty_descriptor_array(DescriptorArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1839 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1840 | // Fix the instance_descriptors for the existing maps. |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1841 | meta_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1842 | meta_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1843 | meta_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1844 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1845 | fixed_array_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1846 | fixed_array_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1847 | fixed_array_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1848 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1849 | oddball_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1850 | oddball_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1851 | oddball_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1852 | |
| 1853 | // Fix prototype object for existing maps. |
| 1854 | meta_map()->set_prototype(null_value()); |
| 1855 | meta_map()->set_constructor(null_value()); |
| 1856 | |
| 1857 | fixed_array_map()->set_prototype(null_value()); |
| 1858 | fixed_array_map()->set_constructor(null_value()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1859 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1860 | oddball_map()->set_prototype(null_value()); |
| 1861 | oddball_map()->set_constructor(null_value()); |
| 1862 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1863 | { MaybeObject* maybe_obj = |
| 1864 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1865 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1866 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1867 | set_fixed_cow_array_map(Map::cast(obj)); |
| 1868 | ASSERT(fixed_array_map() != fixed_cow_array_map()); |
| 1869 | |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 1870 | { MaybeObject* maybe_obj = |
| 1871 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1872 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1873 | } |
| 1874 | set_serialized_scope_info_map(Map::cast(obj)); |
| 1875 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1876 | { MaybeObject* maybe_obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize); |
| 1877 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1878 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1879 | set_heap_number_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1880 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 1881 | { MaybeObject* maybe_obj = AllocateMap(FOREIGN_TYPE, Foreign::kSize); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1882 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1883 | } |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 1884 | set_foreign_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1885 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1886 | for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) { |
| 1887 | const StringTypeTable& entry = string_type_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1888 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 1889 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1890 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1891 | roots_[entry.index] = Map::cast(obj); |
| 1892 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1893 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1894 | { MaybeObject* maybe_obj = AllocateMap(STRING_TYPE, kVariableSizeSentinel); |
| 1895 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1896 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1897 | set_undetectable_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1898 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1899 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1900 | { MaybeObject* maybe_obj = |
| 1901 | AllocateMap(ASCII_STRING_TYPE, kVariableSizeSentinel); |
| 1902 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1903 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1904 | set_undetectable_ascii_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1905 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1906 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1907 | { MaybeObject* maybe_obj = |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1908 | AllocateMap(FIXED_DOUBLE_ARRAY_TYPE, kVariableSizeSentinel); |
| 1909 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1910 | } |
| 1911 | set_fixed_double_array_map(Map::cast(obj)); |
| 1912 | |
| 1913 | { MaybeObject* maybe_obj = |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1914 | AllocateMap(BYTE_ARRAY_TYPE, kVariableSizeSentinel); |
| 1915 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1916 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1917 | set_byte_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1918 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 1919 | { MaybeObject* maybe_obj = |
| 1920 | AllocateMap(FREE_SPACE_TYPE, kVariableSizeSentinel); |
| 1921 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1922 | } |
| 1923 | set_free_space_map(Map::cast(obj)); |
| 1924 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1925 | { MaybeObject* maybe_obj = AllocateByteArray(0, TENURED); |
| 1926 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1927 | } |
| 1928 | set_empty_byte_array(ByteArray::cast(obj)); |
| 1929 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1930 | { MaybeObject* maybe_obj = |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 1931 | AllocateMap(EXTERNAL_PIXEL_ARRAY_TYPE, ExternalArray::kAlignedSize); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1932 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1933 | } |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 1934 | set_external_pixel_array_map(Map::cast(obj)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1935 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1936 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_BYTE_ARRAY_TYPE, |
| 1937 | ExternalArray::kAlignedSize); |
| 1938 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1939 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1940 | set_external_byte_array_map(Map::cast(obj)); |
| 1941 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1942 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE, |
| 1943 | ExternalArray::kAlignedSize); |
| 1944 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1945 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1946 | set_external_unsigned_byte_array_map(Map::cast(obj)); |
| 1947 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1948 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_SHORT_ARRAY_TYPE, |
| 1949 | ExternalArray::kAlignedSize); |
| 1950 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1951 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1952 | set_external_short_array_map(Map::cast(obj)); |
| 1953 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1954 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE, |
| 1955 | ExternalArray::kAlignedSize); |
| 1956 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1957 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1958 | set_external_unsigned_short_array_map(Map::cast(obj)); |
| 1959 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1960 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_INT_ARRAY_TYPE, |
| 1961 | ExternalArray::kAlignedSize); |
| 1962 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1963 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1964 | set_external_int_array_map(Map::cast(obj)); |
| 1965 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1966 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_INT_ARRAY_TYPE, |
| 1967 | ExternalArray::kAlignedSize); |
| 1968 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1969 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1970 | set_external_unsigned_int_array_map(Map::cast(obj)); |
| 1971 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1972 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_FLOAT_ARRAY_TYPE, |
| 1973 | ExternalArray::kAlignedSize); |
| 1974 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1975 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1976 | set_external_float_array_map(Map::cast(obj)); |
| 1977 | |
whesse@chromium.org | 7b26015 | 2011-06-20 15:33:18 +0000 | [diff] [blame] | 1978 | { MaybeObject* maybe_obj = |
| 1979 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1980 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1981 | } |
| 1982 | set_non_strict_arguments_elements_map(Map::cast(obj)); |
| 1983 | |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1984 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_DOUBLE_ARRAY_TYPE, |
| 1985 | ExternalArray::kAlignedSize); |
| 1986 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1987 | } |
| 1988 | set_external_double_array_map(Map::cast(obj)); |
| 1989 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1990 | { MaybeObject* maybe_obj = AllocateMap(CODE_TYPE, kVariableSizeSentinel); |
| 1991 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1992 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1993 | set_code_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1994 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1995 | { MaybeObject* maybe_obj = AllocateMap(JS_GLOBAL_PROPERTY_CELL_TYPE, |
| 1996 | JSGlobalPropertyCell::kSize); |
| 1997 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1998 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1999 | set_global_property_cell_map(Map::cast(obj)); |
| 2000 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2001 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, kPointerSize); |
| 2002 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2003 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2004 | set_one_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2005 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2006 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, 2 * kPointerSize); |
| 2007 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2008 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2009 | set_two_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2010 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2011 | for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) { |
| 2012 | const StructTable& entry = struct_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2013 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 2014 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2015 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2016 | roots_[entry.index] = Map::cast(obj); |
| 2017 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2018 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2019 | { MaybeObject* maybe_obj = |
| 2020 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2021 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2022 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2023 | set_hash_table_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2024 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2025 | { MaybeObject* maybe_obj = |
| 2026 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2027 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2028 | } |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 2029 | set_function_context_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2030 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2031 | { MaybeObject* maybe_obj = |
| 2032 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2033 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2034 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2035 | set_catch_context_map(Map::cast(obj)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 2036 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2037 | { MaybeObject* maybe_obj = |
| 2038 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2039 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2040 | } |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 2041 | set_with_context_map(Map::cast(obj)); |
| 2042 | |
| 2043 | { MaybeObject* maybe_obj = |
| 2044 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2045 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2046 | } |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 2047 | set_block_context_map(Map::cast(obj)); |
| 2048 | |
| 2049 | { MaybeObject* maybe_obj = |
| 2050 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 2051 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2052 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 2053 | Map* global_context_map = Map::cast(obj); |
| 2054 | global_context_map->set_visitor_id(StaticVisitorBase::kVisitGlobalContext); |
| 2055 | set_global_context_map(global_context_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2056 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2057 | { MaybeObject* maybe_obj = AllocateMap(SHARED_FUNCTION_INFO_TYPE, |
| 2058 | SharedFunctionInfo::kAlignedSize); |
| 2059 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2060 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2061 | set_shared_function_info_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2062 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2063 | { MaybeObject* maybe_obj = AllocateMap(JS_MESSAGE_OBJECT_TYPE, |
| 2064 | JSMessageObject::kSize); |
| 2065 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2066 | } |
| 2067 | set_message_object_map(Map::cast(obj)); |
| 2068 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2069 | ASSERT(!InNewSpace(empty_fixed_array())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2070 | return true; |
| 2071 | } |
| 2072 | |
| 2073 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2074 | MaybeObject* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2075 | // Statically ensure that it is safe to allocate heap numbers in paged |
| 2076 | // spaces. |
| 2077 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2078 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2079 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2080 | Object* result; |
| 2081 | { MaybeObject* maybe_result = |
| 2082 | AllocateRaw(HeapNumber::kSize, space, OLD_DATA_SPACE); |
| 2083 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2084 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2085 | |
| 2086 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 2087 | HeapNumber::cast(result)->set_value(value); |
| 2088 | return result; |
| 2089 | } |
| 2090 | |
| 2091 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2092 | MaybeObject* Heap::AllocateHeapNumber(double value) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2093 | // Use general version, if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2094 | if (always_allocate()) return AllocateHeapNumber(value, TENURED); |
| 2095 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2096 | // This version of AllocateHeapNumber is optimized for |
| 2097 | // allocation in new space. |
| 2098 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
| 2099 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2100 | Object* result; |
| 2101 | { MaybeObject* maybe_result = new_space_.AllocateRaw(HeapNumber::kSize); |
| 2102 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2103 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2104 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 2105 | HeapNumber::cast(result)->set_value(value); |
| 2106 | return result; |
| 2107 | } |
| 2108 | |
| 2109 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2110 | MaybeObject* Heap::AllocateJSGlobalPropertyCell(Object* value) { |
| 2111 | Object* result; |
| 2112 | { MaybeObject* maybe_result = AllocateRawCell(); |
| 2113 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2114 | } |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2115 | HeapObject::cast(result)->set_map(global_property_cell_map()); |
| 2116 | JSGlobalPropertyCell::cast(result)->set_value(value); |
| 2117 | return result; |
| 2118 | } |
| 2119 | |
| 2120 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2121 | MaybeObject* Heap::CreateOddball(const char* to_string, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2122 | Object* to_number, |
| 2123 | byte kind) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2124 | Object* result; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2125 | { MaybeObject* maybe_result = Allocate(oddball_map(), OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2126 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2127 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2128 | return Oddball::cast(result)->Initialize(to_string, to_number, kind); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2129 | } |
| 2130 | |
| 2131 | |
| 2132 | bool Heap::CreateApiObjects() { |
| 2133 | Object* obj; |
| 2134 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2135 | { MaybeObject* maybe_obj = AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| 2136 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2137 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2138 | // Don't use Smi-only elements optimizations for objects with the neander |
| 2139 | // map. There are too many cases where element values are set directly with a |
| 2140 | // bottleneck to trap the Smi-only -> fast elements transition, and there |
| 2141 | // appears to be no benefit for optimize this case. |
| 2142 | Map* new_neander_map = Map::cast(obj); |
| 2143 | new_neander_map->set_elements_kind(FAST_ELEMENTS); |
| 2144 | set_neander_map(new_neander_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2145 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2146 | { MaybeObject* maybe_obj = AllocateJSObjectFromMap(neander_map()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2147 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2148 | } |
| 2149 | Object* elements; |
| 2150 | { MaybeObject* maybe_elements = AllocateFixedArray(2); |
| 2151 | if (!maybe_elements->ToObject(&elements)) return false; |
| 2152 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2153 | FixedArray::cast(elements)->set(0, Smi::FromInt(0)); |
| 2154 | JSObject::cast(obj)->set_elements(FixedArray::cast(elements)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2155 | set_message_listeners(JSObject::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2156 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2157 | return true; |
| 2158 | } |
| 2159 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2160 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2161 | void Heap::CreateJSEntryStub() { |
| 2162 | JSEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2163 | set_js_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2164 | } |
| 2165 | |
| 2166 | |
| 2167 | void Heap::CreateJSConstructEntryStub() { |
| 2168 | JSConstructEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2169 | set_js_construct_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2170 | } |
| 2171 | |
| 2172 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2173 | void Heap::CreateFixedStubs() { |
| 2174 | // Here we create roots for fixed stubs. They are needed at GC |
| 2175 | // for cooking and uncooking (check out frames.cc). |
| 2176 | // The eliminates the need for doing dictionary lookup in the |
| 2177 | // stub cache for these stubs. |
| 2178 | HandleScope scope; |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2179 | // gcc-4.4 has problem generating correct code of following snippet: |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2180 | // { JSEntryStub stub; |
| 2181 | // js_entry_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2182 | // } |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2183 | // { JSConstructEntryStub stub; |
| 2184 | // js_construct_entry_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2185 | // } |
| 2186 | // To workaround the problem, make separate functions without inlining. |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2187 | Heap::CreateJSEntryStub(); |
| 2188 | Heap::CreateJSConstructEntryStub(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2189 | |
| 2190 | // Create stubs that should be there, so we don't unexpectedly have to |
| 2191 | // create them if we need them during the creation of another stub. |
| 2192 | // Stub creation mixes raw pointers and handles in an unsafe manner so |
| 2193 | // we cannot create stubs while we are creating stubs. |
| 2194 | CodeStub::GenerateStubsAheadOfTime(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2195 | } |
| 2196 | |
| 2197 | |
| 2198 | bool Heap::CreateInitialObjects() { |
| 2199 | Object* obj; |
| 2200 | |
| 2201 | // The -0 value must be set before NumberFromDouble works. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2202 | { MaybeObject* maybe_obj = AllocateHeapNumber(-0.0, TENURED); |
| 2203 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2204 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2205 | set_minus_zero_value(HeapNumber::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2206 | ASSERT(signbit(minus_zero_value()->Number()) != 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2207 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2208 | { MaybeObject* maybe_obj = AllocateHeapNumber(OS::nan_value(), TENURED); |
| 2209 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2210 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2211 | set_nan_value(HeapNumber::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2212 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2213 | { MaybeObject* maybe_obj = AllocateHeapNumber(V8_INFINITY, TENURED); |
| 2214 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2215 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2216 | set_infinity_value(HeapNumber::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2217 | |
| 2218 | // Allocate initial symbol table. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2219 | { MaybeObject* maybe_obj = SymbolTable::Allocate(kInitialSymbolTableSize); |
| 2220 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2221 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2222 | // Don't use set_symbol_table() due to asserts. |
| 2223 | roots_[kSymbolTableRootIndex] = obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2224 | |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2225 | // Finish initializing oddballs after creating symboltable. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2226 | { MaybeObject* maybe_obj = |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2227 | undefined_value()->Initialize("undefined", |
| 2228 | nan_value(), |
| 2229 | Oddball::kUndefined); |
| 2230 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2231 | } |
| 2232 | |
| 2233 | // Initialize the null_value. |
| 2234 | { MaybeObject* maybe_obj = |
| 2235 | null_value()->Initialize("null", Smi::FromInt(0), Oddball::kNull); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2236 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2237 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2238 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2239 | { MaybeObject* maybe_obj = CreateOddball("true", |
| 2240 | Smi::FromInt(1), |
| 2241 | Oddball::kTrue); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2242 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2243 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2244 | set_true_value(Oddball::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2245 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2246 | { MaybeObject* maybe_obj = CreateOddball("false", |
| 2247 | Smi::FromInt(0), |
| 2248 | Oddball::kFalse); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2249 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2250 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2251 | set_false_value(Oddball::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2252 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2253 | { MaybeObject* maybe_obj = CreateOddball("hole", |
| 2254 | Smi::FromInt(-1), |
| 2255 | Oddball::kTheHole); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2256 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2257 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2258 | set_the_hole_value(Oddball::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2259 | |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2260 | { MaybeObject* maybe_obj = CreateOddball("arguments_marker", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2261 | Smi::FromInt(-2), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2262 | Oddball::kArgumentMarker); |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2263 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2264 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2265 | set_arguments_marker(Oddball::cast(obj)); |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2266 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2267 | { MaybeObject* maybe_obj = CreateOddball("no_interceptor_result_sentinel", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2268 | Smi::FromInt(-3), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2269 | Oddball::kOther); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2270 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2271 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2272 | set_no_interceptor_result_sentinel(obj); |
| 2273 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2274 | { MaybeObject* maybe_obj = CreateOddball("termination_exception", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2275 | Smi::FromInt(-4), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2276 | Oddball::kOther); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2277 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2278 | } |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 2279 | set_termination_exception(obj); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2280 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2281 | { MaybeObject* maybe_obj = CreateOddball("frame_alignment_marker", |
| 2282 | Smi::FromInt(-5), |
| 2283 | Oddball::kOther); |
| 2284 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2285 | } |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 2286 | set_frame_alignment_marker(Oddball::cast(obj)); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2287 | STATIC_ASSERT(Oddball::kLeastHiddenOddballNumber == -5); |
| 2288 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2289 | // Allocate the empty string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2290 | { MaybeObject* maybe_obj = AllocateRawAsciiString(0, TENURED); |
| 2291 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2292 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2293 | set_empty_string(String::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2294 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2295 | for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2296 | { MaybeObject* maybe_obj = |
| 2297 | LookupAsciiSymbol(constant_symbol_table[i].contents); |
| 2298 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2299 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2300 | roots_[constant_symbol_table[i].index] = String::cast(obj); |
| 2301 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2302 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2303 | // Allocate the hidden symbol which is used to identify the hidden properties |
| 2304 | // in JSObjects. The hash code has a special value so that it will not match |
| 2305 | // 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] | 2306 | // 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] | 2307 | // hash code in place. The hash code for the hidden_symbol is zero to ensure |
| 2308 | // 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] | 2309 | { MaybeObject* maybe_obj = |
| 2310 | AllocateSymbol(CStrVector(""), 0, String::kZeroHash); |
| 2311 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2312 | } |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2313 | hidden_symbol_ = String::cast(obj); |
| 2314 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2315 | // Allocate the foreign for __proto__. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2316 | { MaybeObject* maybe_obj = |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2317 | AllocateForeign((Address) &Accessors::ObjectPrototype); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2318 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2319 | } |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2320 | set_prototype_accessors(Foreign::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2321 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2322 | // Allocate the code_stubs dictionary. The initial size is set to avoid |
| 2323 | // expanding the dictionary during bootstrapping. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2324 | { MaybeObject* maybe_obj = NumberDictionary::Allocate(128); |
| 2325 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2326 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2327 | set_code_stubs(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2328 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2329 | // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size |
| 2330 | // is set to avoid expanding the dictionary during bootstrapping. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2331 | { MaybeObject* maybe_obj = NumberDictionary::Allocate(64); |
| 2332 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2333 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2334 | set_non_monomorphic_cache(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2335 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 2336 | { MaybeObject* maybe_obj = AllocatePolymorphicCodeCache(); |
| 2337 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2338 | } |
| 2339 | set_polymorphic_code_cache(PolymorphicCodeCache::cast(obj)); |
| 2340 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 2341 | set_instanceof_cache_function(Smi::FromInt(0)); |
| 2342 | set_instanceof_cache_map(Smi::FromInt(0)); |
| 2343 | set_instanceof_cache_answer(Smi::FromInt(0)); |
| 2344 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2345 | CreateFixedStubs(); |
| 2346 | |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2347 | // Allocate the dictionary of intrinsic function names. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2348 | { MaybeObject* maybe_obj = StringDictionary::Allocate(Runtime::kNumFunctions); |
| 2349 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2350 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2351 | { MaybeObject* maybe_obj = Runtime::InitializeIntrinsicFunctionNames(this, |
| 2352 | obj); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2353 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2354 | } |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2355 | set_intrinsic_function_names(StringDictionary::cast(obj)); |
| 2356 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2357 | if (InitializeNumberStringCache()->IsFailure()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2358 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 2359 | // Allocate cache for single character ASCII strings. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2360 | { MaybeObject* maybe_obj = |
| 2361 | AllocateFixedArray(String::kMaxAsciiCharCode + 1, TENURED); |
| 2362 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2363 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2364 | set_single_character_string_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2365 | |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2366 | // Allocate cache for string split. |
| 2367 | { MaybeObject* maybe_obj = |
| 2368 | AllocateFixedArray(StringSplitCache::kStringSplitCacheSize, TENURED); |
| 2369 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2370 | } |
| 2371 | set_string_split_cache(FixedArray::cast(obj)); |
| 2372 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2373 | // Allocate cache for external strings pointing to native source code. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2374 | { MaybeObject* maybe_obj = AllocateFixedArray(Natives::GetBuiltinsCount()); |
| 2375 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2376 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2377 | set_natives_source_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2378 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2379 | // Handling of script id generation is in FACTORY->NewScript. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2380 | set_last_script_id(undefined_value()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 2381 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2382 | // Initialize keyed lookup cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2383 | isolate_->keyed_lookup_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2384 | |
| 2385 | // Initialize context slot cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2386 | isolate_->context_slot_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2387 | |
| 2388 | // Initialize descriptor cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2389 | isolate_->descriptor_lookup_cache()->Clear(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2390 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 2391 | // Initialize compilation cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2392 | isolate_->compilation_cache()->Clear(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2393 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2394 | return true; |
| 2395 | } |
| 2396 | |
| 2397 | |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2398 | Object* StringSplitCache::Lookup( |
| 2399 | FixedArray* cache, String* string, String* pattern) { |
| 2400 | if (!string->IsSymbol() || !pattern->IsSymbol()) return Smi::FromInt(0); |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2401 | uint32_t hash = string->Hash(); |
| 2402 | uint32_t index = ((hash & (kStringSplitCacheSize - 1)) & |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2403 | ~(kArrayEntriesPerCacheEntry - 1)); |
| 2404 | if (cache->get(index + kStringOffset) == string && |
| 2405 | cache->get(index + kPatternOffset) == pattern) { |
| 2406 | return cache->get(index + kArrayOffset); |
| 2407 | } |
| 2408 | index = ((index + kArrayEntriesPerCacheEntry) & (kStringSplitCacheSize - 1)); |
| 2409 | if (cache->get(index + kStringOffset) == string && |
| 2410 | cache->get(index + kPatternOffset) == pattern) { |
| 2411 | return cache->get(index + kArrayOffset); |
| 2412 | } |
| 2413 | return Smi::FromInt(0); |
| 2414 | } |
| 2415 | |
| 2416 | |
| 2417 | void StringSplitCache::Enter(Heap* heap, |
| 2418 | FixedArray* cache, |
| 2419 | String* string, |
| 2420 | String* pattern, |
| 2421 | FixedArray* array) { |
| 2422 | if (!string->IsSymbol() || !pattern->IsSymbol()) return; |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2423 | uint32_t hash = string->Hash(); |
| 2424 | uint32_t index = ((hash & (kStringSplitCacheSize - 1)) & |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2425 | ~(kArrayEntriesPerCacheEntry - 1)); |
| 2426 | if (cache->get(index + kStringOffset) == Smi::FromInt(0)) { |
| 2427 | cache->set(index + kStringOffset, string); |
| 2428 | cache->set(index + kPatternOffset, pattern); |
| 2429 | cache->set(index + kArrayOffset, array); |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2430 | } else { |
| 2431 | uint32_t index2 = |
| 2432 | ((index + kArrayEntriesPerCacheEntry) & (kStringSplitCacheSize - 1)); |
| 2433 | if (cache->get(index2 + kStringOffset) == Smi::FromInt(0)) { |
| 2434 | cache->set(index2 + kStringOffset, string); |
| 2435 | cache->set(index2 + kPatternOffset, pattern); |
| 2436 | cache->set(index2 + kArrayOffset, array); |
| 2437 | } else { |
| 2438 | cache->set(index2 + kStringOffset, Smi::FromInt(0)); |
| 2439 | cache->set(index2 + kPatternOffset, Smi::FromInt(0)); |
| 2440 | cache->set(index2 + kArrayOffset, Smi::FromInt(0)); |
| 2441 | cache->set(index + kStringOffset, string); |
| 2442 | cache->set(index + kPatternOffset, pattern); |
| 2443 | cache->set(index + kArrayOffset, array); |
| 2444 | } |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2445 | } |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2446 | if (array->length() < 100) { // Limit how many new symbols we want to make. |
| 2447 | for (int i = 0; i < array->length(); i++) { |
| 2448 | String* str = String::cast(array->get(i)); |
| 2449 | Object* symbol; |
| 2450 | MaybeObject* maybe_symbol = heap->LookupSymbol(str); |
| 2451 | if (maybe_symbol->ToObject(&symbol)) { |
| 2452 | array->set(i, symbol); |
| 2453 | } |
| 2454 | } |
| 2455 | } |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 2456 | array->set_map(heap->fixed_cow_array_map()); |
jkummerow@chromium.org | 486075a | 2011-09-07 12:44:28 +0000 | [diff] [blame] | 2457 | } |
| 2458 | |
| 2459 | |
| 2460 | void StringSplitCache::Clear(FixedArray* cache) { |
| 2461 | for (int i = 0; i < kStringSplitCacheSize; i++) { |
| 2462 | cache->set(i, Smi::FromInt(0)); |
| 2463 | } |
| 2464 | } |
| 2465 | |
| 2466 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2467 | MaybeObject* Heap::InitializeNumberStringCache() { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2468 | // Compute the size of the number string cache based on the max heap size. |
| 2469 | // max_semispace_size_ == 512 KB => number_string_cache_size = 32. |
| 2470 | // max_semispace_size_ == 8 MB => number_string_cache_size = 16KB. |
| 2471 | int number_string_cache_size = max_semispace_size_ / 512; |
| 2472 | 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] | 2473 | Object* obj; |
| 2474 | MaybeObject* maybe_obj = |
| 2475 | AllocateFixedArray(number_string_cache_size * 2, TENURED); |
| 2476 | if (maybe_obj->ToObject(&obj)) set_number_string_cache(FixedArray::cast(obj)); |
| 2477 | return maybe_obj; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2478 | } |
| 2479 | |
| 2480 | |
| 2481 | void Heap::FlushNumberStringCache() { |
| 2482 | // Flush the number to string cache. |
| 2483 | int len = number_string_cache()->length(); |
| 2484 | for (int i = 0; i < len; i++) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2485 | number_string_cache()->set_undefined(this, i); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2486 | } |
| 2487 | } |
| 2488 | |
| 2489 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2490 | static inline int double_get_hash(double d) { |
| 2491 | DoubleRepresentation rep(d); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2492 | 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] | 2493 | } |
| 2494 | |
| 2495 | |
| 2496 | static inline int smi_get_hash(Smi* smi) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2497 | return smi->value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2498 | } |
| 2499 | |
| 2500 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2501 | Object* Heap::GetNumberStringCache(Object* number) { |
| 2502 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2503 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2504 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2505 | hash = smi_get_hash(Smi::cast(number)) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2506 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2507 | hash = double_get_hash(number->Number()) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2508 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2509 | Object* key = number_string_cache()->get(hash * 2); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2510 | if (key == number) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2511 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2512 | } else if (key->IsHeapNumber() && |
| 2513 | number->IsHeapNumber() && |
| 2514 | key->Number() == number->Number()) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2515 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2516 | } |
| 2517 | return undefined_value(); |
| 2518 | } |
| 2519 | |
| 2520 | |
| 2521 | void Heap::SetNumberStringCache(Object* number, String* string) { |
| 2522 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2523 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2524 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2525 | hash = smi_get_hash(Smi::cast(number)) & mask; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2526 | number_string_cache()->set(hash * 2, Smi::cast(number)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2527 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2528 | hash = double_get_hash(number->Number()) & mask; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2529 | number_string_cache()->set(hash * 2, number); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2530 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2531 | number_string_cache()->set(hash * 2 + 1, string); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2532 | } |
| 2533 | |
| 2534 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2535 | MaybeObject* Heap::NumberToString(Object* number, |
| 2536 | bool check_number_string_cache) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2537 | isolate_->counters()->number_to_string_runtime()->Increment(); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 2538 | if (check_number_string_cache) { |
| 2539 | Object* cached = GetNumberStringCache(number); |
| 2540 | if (cached != undefined_value()) { |
| 2541 | return cached; |
| 2542 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2543 | } |
| 2544 | |
| 2545 | char arr[100]; |
| 2546 | Vector<char> buffer(arr, ARRAY_SIZE(arr)); |
| 2547 | const char* str; |
| 2548 | if (number->IsSmi()) { |
| 2549 | int num = Smi::cast(number)->value(); |
| 2550 | str = IntToCString(num, buffer); |
| 2551 | } else { |
| 2552 | double num = HeapNumber::cast(number)->value(); |
| 2553 | str = DoubleToCString(num, buffer); |
| 2554 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2555 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2556 | Object* js_string; |
| 2557 | MaybeObject* maybe_js_string = AllocateStringFromAscii(CStrVector(str)); |
| 2558 | if (maybe_js_string->ToObject(&js_string)) { |
| 2559 | SetNumberStringCache(number, String::cast(js_string)); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2560 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2561 | return maybe_js_string; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2562 | } |
| 2563 | |
| 2564 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2565 | MaybeObject* Heap::Uint32ToString(uint32_t value, |
| 2566 | bool check_number_string_cache) { |
| 2567 | Object* number; |
| 2568 | MaybeObject* maybe = NumberFromUint32(value); |
| 2569 | if (!maybe->To<Object>(&number)) return maybe; |
| 2570 | return NumberToString(number, check_number_string_cache); |
| 2571 | } |
| 2572 | |
| 2573 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2574 | Map* Heap::MapForExternalArrayType(ExternalArrayType array_type) { |
| 2575 | return Map::cast(roots_[RootIndexForExternalArrayType(array_type)]); |
| 2576 | } |
| 2577 | |
| 2578 | |
| 2579 | Heap::RootListIndex Heap::RootIndexForExternalArrayType( |
| 2580 | ExternalArrayType array_type) { |
| 2581 | switch (array_type) { |
| 2582 | case kExternalByteArray: |
| 2583 | return kExternalByteArrayMapRootIndex; |
| 2584 | case kExternalUnsignedByteArray: |
| 2585 | return kExternalUnsignedByteArrayMapRootIndex; |
| 2586 | case kExternalShortArray: |
| 2587 | return kExternalShortArrayMapRootIndex; |
| 2588 | case kExternalUnsignedShortArray: |
| 2589 | return kExternalUnsignedShortArrayMapRootIndex; |
| 2590 | case kExternalIntArray: |
| 2591 | return kExternalIntArrayMapRootIndex; |
| 2592 | case kExternalUnsignedIntArray: |
| 2593 | return kExternalUnsignedIntArrayMapRootIndex; |
| 2594 | case kExternalFloatArray: |
| 2595 | return kExternalFloatArrayMapRootIndex; |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 2596 | case kExternalDoubleArray: |
| 2597 | return kExternalDoubleArrayMapRootIndex; |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2598 | case kExternalPixelArray: |
| 2599 | return kExternalPixelArrayMapRootIndex; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2600 | default: |
| 2601 | UNREACHABLE(); |
| 2602 | return kUndefinedValueRootIndex; |
| 2603 | } |
| 2604 | } |
| 2605 | |
| 2606 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2607 | MaybeObject* Heap::NumberFromDouble(double value, PretenureFlag pretenure) { |
kmillikin@chromium.org | 4111b80 | 2010-05-03 10:34:42 +0000 | [diff] [blame] | 2608 | // We need to distinguish the minus zero value and this cannot be |
| 2609 | // done after conversion to int. Doing this by comparing bit |
| 2610 | // patterns is faster than using fpclassify() et al. |
| 2611 | static const DoubleRepresentation minus_zero(-0.0); |
| 2612 | |
| 2613 | DoubleRepresentation rep(value); |
| 2614 | if (rep.bits == minus_zero.bits) { |
| 2615 | return AllocateHeapNumber(-0.0, pretenure); |
| 2616 | } |
| 2617 | |
| 2618 | int int_value = FastD2I(value); |
| 2619 | if (value == int_value && Smi::IsValid(int_value)) { |
| 2620 | return Smi::FromInt(int_value); |
| 2621 | } |
| 2622 | |
| 2623 | // Materialize the value in the heap. |
| 2624 | return AllocateHeapNumber(value, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2625 | } |
| 2626 | |
| 2627 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2628 | MaybeObject* Heap::AllocateForeign(Address address, PretenureFlag pretenure) { |
| 2629 | // Statically ensure that it is safe to allocate foreigns in paged spaces. |
| 2630 | STATIC_ASSERT(Foreign::kSize <= Page::kMaxHeapObjectSize); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2631 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2632 | Object* result; |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2633 | { MaybeObject* maybe_result = Allocate(foreign_map(), space); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2634 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2635 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2636 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2637 | Foreign::cast(result)->set_address(address); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2638 | return result; |
| 2639 | } |
| 2640 | |
| 2641 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2642 | MaybeObject* Heap::AllocateSharedFunctionInfo(Object* name) { |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2643 | SharedFunctionInfo* share; |
| 2644 | MaybeObject* maybe = Allocate(shared_function_info_map(), OLD_POINTER_SPACE); |
| 2645 | if (!maybe->To<SharedFunctionInfo>(&share)) return maybe; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2646 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2647 | // Set pointer fields. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2648 | share->set_name(name); |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 2649 | Code* illegal = isolate_->builtins()->builtin(Builtins::kIllegal); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2650 | share->set_code(illegal); |
ager@chromium.org | b573749 | 2010-07-15 09:29:43 +0000 | [diff] [blame] | 2651 | share->set_scope_info(SerializedScopeInfo::Empty()); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2652 | Code* construct_stub = |
| 2653 | isolate_->builtins()->builtin(Builtins::kJSConstructStubGeneric); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2654 | share->set_construct_stub(construct_stub); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2655 | share->set_instance_class_name(Object_symbol()); |
| 2656 | share->set_function_data(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2657 | share->set_script(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2658 | share->set_debug_info(undefined_value()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 2659 | share->set_inferred_name(empty_string()); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 2660 | share->set_initial_map(undefined_value()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2661 | share->set_this_property_assignments(undefined_value()); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2662 | share->set_deopt_counter(Smi::FromInt(FLAG_deopt_every_n_times)); |
| 2663 | |
| 2664 | // Set integer fields (smi or int, depending on the architecture). |
| 2665 | share->set_length(0); |
| 2666 | share->set_formal_parameter_count(0); |
| 2667 | share->set_expected_nof_properties(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2668 | share->set_num_literals(0); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2669 | share->set_start_position_and_type(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2670 | share->set_end_position(0); |
| 2671 | share->set_function_token_position(0); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2672 | // All compiler hints default to false or 0. |
| 2673 | share->set_compiler_hints(0); |
| 2674 | share->set_this_property_assignments_count(0); |
| 2675 | share->set_opt_count(0); |
| 2676 | |
| 2677 | return share; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2678 | } |
| 2679 | |
| 2680 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2681 | MaybeObject* Heap::AllocateJSMessageObject(String* type, |
| 2682 | JSArray* arguments, |
| 2683 | int start_position, |
| 2684 | int end_position, |
| 2685 | Object* script, |
| 2686 | Object* stack_trace, |
| 2687 | Object* stack_frames) { |
| 2688 | Object* result; |
| 2689 | { MaybeObject* maybe_result = Allocate(message_object_map(), NEW_SPACE); |
| 2690 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2691 | } |
| 2692 | JSMessageObject* message = JSMessageObject::cast(result); |
| 2693 | message->set_properties(Heap::empty_fixed_array()); |
| 2694 | message->set_elements(Heap::empty_fixed_array()); |
| 2695 | message->set_type(type); |
| 2696 | message->set_arguments(arguments); |
| 2697 | message->set_start_position(start_position); |
| 2698 | message->set_end_position(end_position); |
| 2699 | message->set_script(script); |
| 2700 | message->set_stack_trace(stack_trace); |
| 2701 | message->set_stack_frames(stack_frames); |
| 2702 | return result; |
| 2703 | } |
| 2704 | |
| 2705 | |
| 2706 | |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2707 | // Returns true for a character in a range. Both limits are inclusive. |
| 2708 | static inline bool Between(uint32_t character, uint32_t from, uint32_t to) { |
| 2709 | // This makes uses of the the unsigned wraparound. |
| 2710 | return character - from <= to - from; |
| 2711 | } |
| 2712 | |
| 2713 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2714 | MUST_USE_RESULT static inline MaybeObject* MakeOrFindTwoCharacterString( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2715 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2716 | uint32_t c1, |
| 2717 | uint32_t c2) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2718 | String* symbol; |
| 2719 | // Numeric strings have a different hash algorithm not known by |
| 2720 | // LookupTwoCharsSymbolIfExists, so we skip this step for such strings. |
| 2721 | if ((!Between(c1, '0', '9') || !Between(c2, '0', '9')) && |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2722 | heap->symbol_table()->LookupTwoCharsSymbolIfExists(c1, c2, &symbol)) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2723 | return symbol; |
| 2724 | // Now we know the length is 2, we might as well make use of that fact |
| 2725 | // when building the new string. |
| 2726 | } else if ((c1 | c2) <= String::kMaxAsciiCharCodeU) { // We can do this |
| 2727 | ASSERT(IsPowerOf2(String::kMaxAsciiCharCodeU + 1)); // because of this. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2728 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2729 | { MaybeObject* maybe_result = heap->AllocateRawAsciiString(2); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2730 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2731 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2732 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2733 | dest[0] = c1; |
| 2734 | dest[1] = c2; |
| 2735 | return result; |
| 2736 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2737 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2738 | { MaybeObject* maybe_result = heap->AllocateRawTwoByteString(2); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2739 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2740 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2741 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
| 2742 | dest[0] = c1; |
| 2743 | dest[1] = c2; |
| 2744 | return result; |
| 2745 | } |
| 2746 | } |
| 2747 | |
| 2748 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2749 | MaybeObject* Heap::AllocateConsString(String* first, String* second) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2750 | int first_length = first->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2751 | if (first_length == 0) { |
| 2752 | return second; |
| 2753 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2754 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2755 | int second_length = second->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2756 | if (second_length == 0) { |
| 2757 | return first; |
| 2758 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2759 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2760 | int length = first_length + second_length; |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2761 | |
| 2762 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2763 | // dictionary. Check whether we already have the string in the symbol |
| 2764 | // table to prevent creation of many unneccesary strings. |
| 2765 | if (length == 2) { |
| 2766 | unsigned c1 = first->Get(0); |
| 2767 | unsigned c2 = second->Get(0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2768 | return MakeOrFindTwoCharacterString(this, c1, c2); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2769 | } |
| 2770 | |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2771 | bool first_is_ascii = first->IsAsciiRepresentation(); |
| 2772 | bool second_is_ascii = second->IsAsciiRepresentation(); |
| 2773 | bool is_ascii = first_is_ascii && second_is_ascii; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2774 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2775 | // 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] | 2776 | // of the new cons string is too large. |
| 2777 | if (length > String::kMaxLength || length < 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2778 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2779 | return Failure::OutOfMemoryException(); |
| 2780 | } |
| 2781 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2782 | bool is_ascii_data_in_two_byte_string = false; |
| 2783 | if (!is_ascii) { |
| 2784 | // At least one of the strings uses two-byte representation so we |
| 2785 | // can't use the fast case code for short ascii strings below, but |
| 2786 | // we can try to save memory if all chars actually fit in ascii. |
| 2787 | is_ascii_data_in_two_byte_string = |
| 2788 | first->HasOnlyAsciiChars() && second->HasOnlyAsciiChars(); |
| 2789 | if (is_ascii_data_in_two_byte_string) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2790 | isolate_->counters()->string_add_runtime_ext_to_ascii()->Increment(); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2791 | } |
| 2792 | } |
| 2793 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2794 | // If the resulting string is small make a flat string. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2795 | if (length < String::kMinNonFlatLength) { |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2796 | // Note that neither of the two inputs can be a slice because: |
| 2797 | STATIC_ASSERT(String::kMinNonFlatLength <= SlicedString::kMinLength); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2798 | ASSERT(first->IsFlat()); |
| 2799 | ASSERT(second->IsFlat()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2800 | if (is_ascii) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2801 | Object* result; |
| 2802 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2803 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2804 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2805 | // Copy the characters into the new object. |
| 2806 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2807 | // Copy first part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2808 | const char* src; |
| 2809 | if (first->IsExternalString()) { |
| 2810 | src = ExternalAsciiString::cast(first)->resource()->data(); |
| 2811 | } else { |
| 2812 | src = SeqAsciiString::cast(first)->GetChars(); |
| 2813 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2814 | for (int i = 0; i < first_length; i++) *dest++ = src[i]; |
| 2815 | // Copy second part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2816 | if (second->IsExternalString()) { |
| 2817 | src = ExternalAsciiString::cast(second)->resource()->data(); |
| 2818 | } else { |
| 2819 | src = SeqAsciiString::cast(second)->GetChars(); |
| 2820 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2821 | for (int i = 0; i < second_length; i++) *dest++ = src[i]; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2822 | return result; |
| 2823 | } else { |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2824 | if (is_ascii_data_in_two_byte_string) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2825 | Object* result; |
| 2826 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2827 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2828 | } |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2829 | // Copy the characters into the new object. |
| 2830 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2831 | String::WriteToFlat(first, dest, 0, first_length); |
| 2832 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2833 | isolate_->counters()->string_add_runtime_ext_to_ascii()->Increment(); |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2834 | return result; |
| 2835 | } |
| 2836 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2837 | Object* result; |
| 2838 | { MaybeObject* maybe_result = AllocateRawTwoByteString(length); |
| 2839 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2840 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2841 | // Copy the characters into the new object. |
| 2842 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2843 | String::WriteToFlat(first, dest, 0, first_length); |
| 2844 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2845 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2846 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2847 | } |
| 2848 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2849 | Map* map = (is_ascii || is_ascii_data_in_two_byte_string) ? |
| 2850 | cons_ascii_string_map() : cons_string_map(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2851 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2852 | Object* result; |
| 2853 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2854 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2855 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2856 | |
| 2857 | AssertNoAllocation no_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2858 | ConsString* cons_string = ConsString::cast(result); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2859 | WriteBarrierMode mode = cons_string->GetWriteBarrierMode(no_gc); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2860 | cons_string->set_length(length); |
| 2861 | cons_string->set_hash_field(String::kEmptyHashField); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2862 | cons_string->set_first(first, mode); |
| 2863 | cons_string->set_second(second, mode); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2864 | return result; |
| 2865 | } |
| 2866 | |
| 2867 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2868 | MaybeObject* Heap::AllocateSubString(String* buffer, |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 2869 | int start, |
| 2870 | int end, |
| 2871 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2872 | int length = end - start; |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 2873 | if (length == 0) { |
| 2874 | return empty_string(); |
| 2875 | } else if (length == 1) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2876 | return LookupSingleCharacterStringFromCode(buffer->Get(start)); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2877 | } else if (length == 2) { |
| 2878 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2879 | // dictionary. Check whether we already have the string in the symbol |
| 2880 | // table to prevent creation of many unneccesary strings. |
| 2881 | unsigned c1 = buffer->Get(start); |
| 2882 | unsigned c2 = buffer->Get(start + 1); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2883 | return MakeOrFindTwoCharacterString(this, c1, c2); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2884 | } |
| 2885 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2886 | // 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] | 2887 | buffer = buffer->TryFlattenGetString(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2888 | |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2889 | if (!FLAG_string_slices || |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2890 | !buffer->IsFlat() || |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2891 | length < SlicedString::kMinLength || |
| 2892 | pretenure == TENURED) { |
| 2893 | Object* result; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2894 | // WriteToFlat takes care of the case when an indirect string has a |
| 2895 | // different encoding from its underlying string. These encodings may |
| 2896 | // differ because of externalization. |
| 2897 | bool is_ascii = buffer->IsAsciiRepresentation(); |
| 2898 | { MaybeObject* maybe_result = is_ascii |
| 2899 | ? AllocateRawAsciiString(length, pretenure) |
| 2900 | : AllocateRawTwoByteString(length, pretenure); |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2901 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2902 | } |
| 2903 | String* string_result = String::cast(result); |
| 2904 | // Copy the characters into the new object. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2905 | if (is_ascii) { |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2906 | ASSERT(string_result->IsAsciiRepresentation()); |
| 2907 | char* dest = SeqAsciiString::cast(string_result)->GetChars(); |
| 2908 | String::WriteToFlat(buffer, dest, start, end); |
| 2909 | } else { |
| 2910 | ASSERT(string_result->IsTwoByteRepresentation()); |
| 2911 | uc16* dest = SeqTwoByteString::cast(string_result)->GetChars(); |
| 2912 | String::WriteToFlat(buffer, dest, start, end); |
| 2913 | } |
| 2914 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2915 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2916 | |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2917 | ASSERT(buffer->IsFlat()); |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2918 | #if DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 2919 | if (FLAG_verify_heap) { |
| 2920 | buffer->StringVerify(); |
| 2921 | } |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2922 | #endif |
| 2923 | |
| 2924 | Object* result; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2925 | // When slicing an indirect string we use its encoding for a newly created |
| 2926 | // slice and don't check the encoding of the underlying string. This is safe |
| 2927 | // even if the encodings are different because of externalization. If an |
| 2928 | // indirect ASCII string is pointing to a two-byte string, the two-byte char |
| 2929 | // codes of the underlying string must still fit into ASCII (because |
| 2930 | // externalization must not change char codes). |
ricow@chromium.org | 4668a2c | 2011-08-29 10:41:00 +0000 | [diff] [blame] | 2931 | { Map* map = buffer->IsAsciiRepresentation() |
| 2932 | ? sliced_ascii_string_map() |
| 2933 | : sliced_string_map(); |
| 2934 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2935 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2936 | } |
| 2937 | |
| 2938 | AssertNoAllocation no_gc; |
| 2939 | SlicedString* sliced_string = SlicedString::cast(result); |
| 2940 | sliced_string->set_length(length); |
| 2941 | sliced_string->set_hash_field(String::kEmptyHashField); |
| 2942 | if (buffer->IsConsString()) { |
| 2943 | ConsString* cons = ConsString::cast(buffer); |
| 2944 | ASSERT(cons->second()->length() == 0); |
| 2945 | sliced_string->set_parent(cons->first()); |
| 2946 | sliced_string->set_offset(start); |
| 2947 | } else if (buffer->IsSlicedString()) { |
| 2948 | // Prevent nesting sliced strings. |
| 2949 | SlicedString* parent_slice = SlicedString::cast(buffer); |
| 2950 | sliced_string->set_parent(parent_slice->parent()); |
| 2951 | sliced_string->set_offset(start + parent_slice->offset()); |
| 2952 | } else { |
| 2953 | sliced_string->set_parent(buffer); |
| 2954 | sliced_string->set_offset(start); |
| 2955 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2956 | ASSERT(sliced_string->parent()->IsSeqString() || |
| 2957 | sliced_string->parent()->IsExternalString()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2958 | return result; |
| 2959 | } |
| 2960 | |
| 2961 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2962 | MaybeObject* Heap::AllocateExternalStringFromAscii( |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2963 | const ExternalAsciiString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2964 | size_t length = resource->length(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2965 | if (length > static_cast<size_t>(String::kMaxLength)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2966 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2967 | return Failure::OutOfMemoryException(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2968 | } |
| 2969 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2970 | Map* map = external_ascii_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2971 | Object* result; |
| 2972 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2973 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2974 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2975 | |
| 2976 | ExternalAsciiString* external_string = ExternalAsciiString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2977 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2978 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2979 | external_string->set_resource(resource); |
| 2980 | |
| 2981 | return result; |
| 2982 | } |
| 2983 | |
| 2984 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2985 | MaybeObject* Heap::AllocateExternalStringFromTwoByte( |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2986 | const ExternalTwoByteString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2987 | size_t length = resource->length(); |
| 2988 | if (length > static_cast<size_t>(String::kMaxLength)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2989 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2990 | return Failure::OutOfMemoryException(); |
| 2991 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2992 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2993 | // For small strings we check whether the resource contains only |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 2994 | // ASCII characters. If yes, we use a different string map. |
| 2995 | static const size_t kAsciiCheckLengthLimit = 32; |
| 2996 | bool is_ascii = length <= kAsciiCheckLengthLimit && |
| 2997 | String::IsAscii(resource->data(), static_cast<int>(length)); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2998 | Map* map = is_ascii ? |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2999 | external_string_with_ascii_data_map() : external_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3000 | Object* result; |
| 3001 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3002 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3003 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3004 | |
| 3005 | ExternalTwoByteString* external_string = ExternalTwoByteString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3006 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3007 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3008 | external_string->set_resource(resource); |
| 3009 | |
| 3010 | return result; |
| 3011 | } |
| 3012 | |
| 3013 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3014 | MaybeObject* Heap::LookupSingleCharacterStringFromCode(uint16_t code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3015 | if (code <= String::kMaxAsciiCharCode) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3016 | Object* value = single_character_string_cache()->get(code); |
| 3017 | if (value != undefined_value()) return value; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3018 | |
| 3019 | char buffer[1]; |
| 3020 | buffer[0] = static_cast<char>(code); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3021 | Object* result; |
| 3022 | MaybeObject* maybe_result = LookupSymbol(Vector<const char>(buffer, 1)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3023 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3024 | if (!maybe_result->ToObject(&result)) return maybe_result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3025 | single_character_string_cache()->set(code, result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3026 | return result; |
| 3027 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3028 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3029 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3030 | { MaybeObject* maybe_result = AllocateRawTwoByteString(1); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3031 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3032 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3033 | String* answer = String::cast(result); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3034 | answer->Set(0, code); |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3035 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3036 | } |
| 3037 | |
| 3038 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3039 | MaybeObject* Heap::AllocateByteArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3040 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 3041 | return Failure::OutOfMemoryException(); |
| 3042 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3043 | if (pretenure == NOT_TENURED) { |
| 3044 | return AllocateByteArray(length); |
| 3045 | } |
| 3046 | int size = ByteArray::SizeFor(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3047 | Object* result; |
| 3048 | { MaybeObject* maybe_result = (size <= MaxObjectSizeInPagedSpace()) |
| 3049 | ? old_data_space_->AllocateRaw(size) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3050 | : lo_space_->AllocateRaw(size, NOT_EXECUTABLE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3051 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3052 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3053 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3054 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 3055 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3056 | return result; |
| 3057 | } |
| 3058 | |
| 3059 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3060 | MaybeObject* Heap::AllocateByteArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3061 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 3062 | return Failure::OutOfMemoryException(); |
| 3063 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3064 | int size = ByteArray::SizeFor(length); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3065 | AllocationSpace space = |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3066 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3067 | Object* result; |
| 3068 | { MaybeObject* maybe_result = AllocateRaw(size, space, OLD_DATA_SPACE); |
| 3069 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3070 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3071 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3072 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 3073 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3074 | return result; |
| 3075 | } |
| 3076 | |
| 3077 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 3078 | void Heap::CreateFillerObjectAt(Address addr, int size) { |
| 3079 | if (size == 0) return; |
| 3080 | HeapObject* filler = HeapObject::FromAddress(addr); |
| 3081 | if (size == kPointerSize) { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 3082 | filler->set_map(one_pointer_filler_map()); |
| 3083 | } else if (size == 2 * kPointerSize) { |
| 3084 | filler->set_map(two_pointer_filler_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 3085 | } else { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3086 | filler->set_map(free_space_map()); |
| 3087 | FreeSpace::cast(filler)->set_size(size); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 3088 | } |
| 3089 | } |
| 3090 | |
| 3091 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3092 | MaybeObject* Heap::AllocateExternalArray(int length, |
| 3093 | ExternalArrayType array_type, |
| 3094 | void* external_pointer, |
| 3095 | PretenureFlag pretenure) { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3096 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3097 | Object* result; |
| 3098 | { MaybeObject* maybe_result = AllocateRaw(ExternalArray::kAlignedSize, |
| 3099 | space, |
| 3100 | OLD_DATA_SPACE); |
| 3101 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3102 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3103 | |
| 3104 | reinterpret_cast<ExternalArray*>(result)->set_map( |
| 3105 | MapForExternalArrayType(array_type)); |
| 3106 | reinterpret_cast<ExternalArray*>(result)->set_length(length); |
| 3107 | reinterpret_cast<ExternalArray*>(result)->set_external_pointer( |
| 3108 | external_pointer); |
| 3109 | |
| 3110 | return result; |
| 3111 | } |
| 3112 | |
| 3113 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3114 | MaybeObject* Heap::CreateCode(const CodeDesc& desc, |
| 3115 | Code::Flags flags, |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 3116 | Handle<Object> self_reference, |
| 3117 | bool immovable) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3118 | // Allocate ByteArray before the Code object, so that we do not risk |
| 3119 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3120 | Object* reloc_info; |
| 3121 | { MaybeObject* maybe_reloc_info = AllocateByteArray(desc.reloc_size, TENURED); |
| 3122 | if (!maybe_reloc_info->ToObject(&reloc_info)) return maybe_reloc_info; |
| 3123 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3124 | |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 3125 | // Compute size. |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3126 | int body_size = RoundUp(desc.instr_size, kObjectAlignment); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3127 | int obj_size = Code::SizeFor(body_size); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3128 | ASSERT(IsAligned(static_cast<intptr_t>(obj_size), kCodeAlignment)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3129 | MaybeObject* maybe_result; |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 3130 | // Large code objects and code objects which should stay at a fixed address |
| 3131 | // are allocated in large object space. |
| 3132 | if (obj_size > MaxObjectSizeInPagedSpace() || immovable) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3133 | maybe_result = lo_space_->AllocateRaw(obj_size, EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3134 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3135 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3136 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3137 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3138 | Object* result; |
| 3139 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3140 | |
| 3141 | // Initialize the object |
| 3142 | HeapObject::cast(result)->set_map(code_map()); |
| 3143 | Code* code = Code::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3144 | ASSERT(!isolate_->code_range()->exists() || |
| 3145 | isolate_->code_range()->contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3146 | code->set_instruction_size(desc.instr_size); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3147 | code->set_relocation_info(ByteArray::cast(reloc_info)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3148 | code->set_flags(flags); |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 3149 | if (code->is_call_stub() || code->is_keyed_call_stub()) { |
| 3150 | code->set_check_type(RECEIVER_MAP_CHECK); |
| 3151 | } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 3152 | code->set_deoptimization_data(empty_fixed_array()); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3153 | code->set_next_code_flushing_candidate(undefined_value()); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 3154 | // Allow self references to created code object by patching the handle to |
| 3155 | // point to the newly allocated Code object. |
| 3156 | if (!self_reference.is_null()) { |
| 3157 | *(self_reference.location()) = code; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3158 | } |
| 3159 | // Migrate generated code. |
| 3160 | // The generated code can contain Object** values (typically from handles) |
| 3161 | // that are dereferenced during the copy to point directly to the actual heap |
| 3162 | // objects. These pointers can include references to the code object itself, |
| 3163 | // through the self_reference parameter. |
| 3164 | code->CopyFrom(desc); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3165 | |
| 3166 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3167 | if (FLAG_verify_heap) { |
| 3168 | code->Verify(); |
| 3169 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3170 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3171 | return code; |
| 3172 | } |
| 3173 | |
| 3174 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3175 | MaybeObject* Heap::CopyCode(Code* code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3176 | // Allocate an object the same size as the code object. |
| 3177 | int obj_size = code->Size(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3178 | MaybeObject* maybe_result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3179 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3180 | maybe_result = lo_space_->AllocateRaw(obj_size, EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3181 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3182 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3183 | } |
| 3184 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3185 | Object* result; |
| 3186 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3187 | |
| 3188 | // Copy code object. |
| 3189 | Address old_addr = code->address(); |
| 3190 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3191 | CopyBlock(new_addr, old_addr, obj_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3192 | // Relocate the copy. |
| 3193 | Code* new_code = Code::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3194 | ASSERT(!isolate_->code_range()->exists() || |
| 3195 | isolate_->code_range()->contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3196 | new_code->Relocate(new_addr - old_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3197 | return new_code; |
| 3198 | } |
| 3199 | |
| 3200 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3201 | MaybeObject* Heap::CopyCode(Code* code, Vector<byte> reloc_info) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3202 | // Allocate ByteArray before the Code object, so that we do not risk |
| 3203 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3204 | Object* reloc_info_array; |
| 3205 | { MaybeObject* maybe_reloc_info_array = |
| 3206 | AllocateByteArray(reloc_info.length(), TENURED); |
| 3207 | if (!maybe_reloc_info_array->ToObject(&reloc_info_array)) { |
| 3208 | return maybe_reloc_info_array; |
| 3209 | } |
| 3210 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3211 | |
| 3212 | int new_body_size = RoundUp(code->instruction_size(), kObjectAlignment); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3213 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3214 | int new_obj_size = Code::SizeFor(new_body_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3215 | |
| 3216 | Address old_addr = code->address(); |
| 3217 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3218 | size_t relocation_offset = |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3219 | static_cast<size_t>(code->instruction_end() - old_addr); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3220 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3221 | MaybeObject* maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3222 | if (new_obj_size > MaxObjectSizeInPagedSpace()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3223 | maybe_result = lo_space_->AllocateRaw(new_obj_size, EXECUTABLE); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3224 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3225 | maybe_result = code_space_->AllocateRaw(new_obj_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3226 | } |
| 3227 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3228 | Object* result; |
| 3229 | if (!maybe_result->ToObject(&result)) return maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3230 | |
| 3231 | // Copy code object. |
| 3232 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
| 3233 | |
| 3234 | // Copy header and instructions. |
| 3235 | memcpy(new_addr, old_addr, relocation_offset); |
| 3236 | |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3237 | Code* new_code = Code::cast(result); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3238 | new_code->set_relocation_info(ByteArray::cast(reloc_info_array)); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3239 | |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3240 | // Copy patched rinfo. |
| 3241 | memcpy(new_code->relocation_start(), reloc_info.start(), reloc_info.length()); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3242 | |
| 3243 | // Relocate the copy. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3244 | ASSERT(!isolate_->code_range()->exists() || |
| 3245 | isolate_->code_range()->contains(code->address())); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3246 | new_code->Relocate(new_addr - old_addr); |
| 3247 | |
| 3248 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3249 | if (FLAG_verify_heap) { |
| 3250 | code->Verify(); |
| 3251 | } |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 3252 | #endif |
| 3253 | return new_code; |
| 3254 | } |
| 3255 | |
| 3256 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3257 | MaybeObject* Heap::Allocate(Map* map, AllocationSpace space) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3258 | ASSERT(gc_state_ == NOT_IN_GC); |
| 3259 | ASSERT(map->instance_type() != MAP_TYPE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3260 | // If allocation failures are disallowed, we may allocate in a different |
| 3261 | // space when new space is full and the object is not a large object. |
| 3262 | AllocationSpace retry_space = |
| 3263 | (space != NEW_SPACE) ? space : TargetSpaceId(map->instance_type()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3264 | Object* result; |
| 3265 | { MaybeObject* maybe_result = |
| 3266 | AllocateRaw(map->instance_size(), space, retry_space); |
| 3267 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3268 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3269 | HeapObject::cast(result)->set_map(map); |
| 3270 | return result; |
| 3271 | } |
| 3272 | |
| 3273 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3274 | void Heap::InitializeFunction(JSFunction* function, |
| 3275 | SharedFunctionInfo* shared, |
| 3276 | Object* prototype) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3277 | ASSERT(!prototype->IsMap()); |
| 3278 | function->initialize_properties(); |
| 3279 | function->initialize_elements(); |
| 3280 | function->set_shared(shared); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 3281 | function->set_code(shared->code()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3282 | function->set_prototype_or_initial_map(prototype); |
| 3283 | function->set_context(undefined_value()); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3284 | function->set_literals_or_bindings(empty_fixed_array()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 3285 | function->set_next_function_link(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3286 | } |
| 3287 | |
| 3288 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3289 | MaybeObject* Heap::AllocateFunctionPrototype(JSFunction* function) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3290 | // Allocate the prototype. Make sure to use the object function |
| 3291 | // from the function's context, since the function can be from a |
| 3292 | // different context. |
| 3293 | JSFunction* object_function = |
| 3294 | function->context()->global_context()->object_function(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3295 | |
| 3296 | // Each function prototype gets a copy of the object function map. |
| 3297 | // This avoid unwanted sharing of maps between prototypes of different |
| 3298 | // constructors. |
| 3299 | Map* new_map; |
| 3300 | ASSERT(object_function->has_initial_map()); |
| 3301 | { MaybeObject* maybe_map = |
| 3302 | object_function->initial_map()->CopyDropTransitions(); |
| 3303 | if (!maybe_map->To<Map>(&new_map)) return maybe_map; |
| 3304 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3305 | Object* prototype; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3306 | { MaybeObject* maybe_prototype = AllocateJSObjectFromMap(new_map); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3307 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3308 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3309 | // When creating the prototype for the function we must set its |
| 3310 | // constructor to the function. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3311 | Object* result; |
| 3312 | { MaybeObject* maybe_result = |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 3313 | JSObject::cast(prototype)->SetLocalPropertyIgnoreAttributes( |
| 3314 | constructor_symbol(), function, DONT_ENUM); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3315 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3316 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3317 | return prototype; |
| 3318 | } |
| 3319 | |
| 3320 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3321 | MaybeObject* Heap::AllocateFunction(Map* function_map, |
| 3322 | SharedFunctionInfo* shared, |
| 3323 | Object* prototype, |
| 3324 | PretenureFlag pretenure) { |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3325 | AllocationSpace space = |
| 3326 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3327 | Object* result; |
| 3328 | { MaybeObject* maybe_result = Allocate(function_map, space); |
| 3329 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3330 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3331 | InitializeFunction(JSFunction::cast(result), shared, prototype); |
| 3332 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3333 | } |
| 3334 | |
| 3335 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3336 | MaybeObject* Heap::AllocateArgumentsObject(Object* callee, int length) { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 3337 | // To get fast allocation and map sharing for arguments objects we |
| 3338 | // allocate them based on an arguments boilerplate. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3339 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3340 | JSObject* boilerplate; |
| 3341 | int arguments_object_size; |
| 3342 | bool strict_mode_callee = callee->IsJSFunction() && |
| 3343 | JSFunction::cast(callee)->shared()->strict_mode(); |
| 3344 | if (strict_mode_callee) { |
| 3345 | boilerplate = |
| 3346 | isolate()->context()->global_context()-> |
| 3347 | strict_mode_arguments_boilerplate(); |
| 3348 | arguments_object_size = kArgumentsObjectSizeStrict; |
| 3349 | } else { |
| 3350 | boilerplate = |
| 3351 | isolate()->context()->global_context()->arguments_boilerplate(); |
| 3352 | arguments_object_size = kArgumentsObjectSize; |
| 3353 | } |
| 3354 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3355 | // This calls Copy directly rather than using Heap::AllocateRaw so we |
| 3356 | // duplicate the check here. |
| 3357 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 3358 | |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3359 | // Check that the size of the boilerplate matches our |
| 3360 | // expectations. The ArgumentsAccessStub::GenerateNewObject relies |
| 3361 | // on the size being a known constant. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3362 | ASSERT(arguments_object_size == boilerplate->map()->instance_size()); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3363 | |
| 3364 | // Do the allocation. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3365 | Object* result; |
| 3366 | { MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3367 | AllocateRaw(arguments_object_size, NEW_SPACE, OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3368 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3369 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3370 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3371 | // Copy the content. The arguments boilerplate doesn't have any |
| 3372 | // fields that point to new space so it's safe to skip the write |
| 3373 | // barrier here. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3374 | CopyBlock(HeapObject::cast(result)->address(), |
| 3375 | boilerplate->address(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3376 | JSObject::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3377 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3378 | // Set the length property. |
| 3379 | JSObject::cast(result)->InObjectPropertyAtPut(kArgumentsLengthIndex, |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3380 | Smi::FromInt(length), |
| 3381 | SKIP_WRITE_BARRIER); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3382 | // Set the callee property for non-strict mode arguments object only. |
| 3383 | if (!strict_mode_callee) { |
| 3384 | JSObject::cast(result)->InObjectPropertyAtPut(kArgumentsCalleeIndex, |
| 3385 | callee); |
| 3386 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3387 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3388 | // Check the state of the object |
| 3389 | ASSERT(JSObject::cast(result)->HasFastProperties()); |
| 3390 | ASSERT(JSObject::cast(result)->HasFastElements()); |
| 3391 | |
| 3392 | return result; |
| 3393 | } |
| 3394 | |
| 3395 | |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3396 | static bool HasDuplicates(DescriptorArray* descriptors) { |
| 3397 | int count = descriptors->number_of_descriptors(); |
| 3398 | if (count > 1) { |
| 3399 | String* prev_key = descriptors->GetKey(0); |
| 3400 | for (int i = 1; i != count; i++) { |
| 3401 | String* current_key = descriptors->GetKey(i); |
| 3402 | if (prev_key == current_key) return true; |
| 3403 | prev_key = current_key; |
| 3404 | } |
| 3405 | } |
| 3406 | return false; |
| 3407 | } |
| 3408 | |
| 3409 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3410 | MaybeObject* Heap::AllocateInitialMap(JSFunction* fun) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3411 | ASSERT(!fun->has_initial_map()); |
| 3412 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3413 | // First create a new map with the size and number of in-object properties |
| 3414 | // suggested by the function. |
| 3415 | int instance_size = fun->shared()->CalculateInstanceSize(); |
| 3416 | int in_object_properties = fun->shared()->CalculateInObjectProperties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3417 | Object* map_obj; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3418 | { MaybeObject* maybe_map_obj = AllocateMap(JS_OBJECT_TYPE, instance_size); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3419 | if (!maybe_map_obj->ToObject(&map_obj)) return maybe_map_obj; |
| 3420 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3421 | |
| 3422 | // Fetch or allocate prototype. |
| 3423 | Object* prototype; |
| 3424 | if (fun->has_instance_prototype()) { |
| 3425 | prototype = fun->instance_prototype(); |
| 3426 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3427 | { MaybeObject* maybe_prototype = AllocateFunctionPrototype(fun); |
| 3428 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3429 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3430 | } |
| 3431 | Map* map = Map::cast(map_obj); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3432 | map->set_inobject_properties(in_object_properties); |
| 3433 | map->set_unused_property_fields(in_object_properties); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3434 | map->set_prototype(prototype); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3435 | ASSERT(map->has_fast_elements()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3436 | |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3437 | // If the function has only simple this property assignments add |
| 3438 | // field descriptors for these to the initial map as the object |
| 3439 | // cannot be constructed without having these properties. Guard by |
| 3440 | // the inline_new flag so we only change the map if we generate a |
| 3441 | // specialized construct stub. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3442 | ASSERT(in_object_properties <= Map::kMaxPreAllocatedPropertyFields); |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3443 | if (fun->shared()->CanGenerateInlineConstructor(prototype)) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3444 | int count = fun->shared()->this_property_assignments_count(); |
| 3445 | if (count > in_object_properties) { |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3446 | // Inline constructor can only handle inobject properties. |
| 3447 | fun->shared()->ForbidInlineConstructor(); |
| 3448 | } else { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3449 | DescriptorArray* descriptors; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3450 | { MaybeObject* maybe_descriptors_obj = DescriptorArray::Allocate(count); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3451 | if (!maybe_descriptors_obj->To<DescriptorArray>(&descriptors)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3452 | return maybe_descriptors_obj; |
| 3453 | } |
| 3454 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3455 | DescriptorArray::WhitenessWitness witness(descriptors); |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3456 | for (int i = 0; i < count; i++) { |
| 3457 | String* name = fun->shared()->GetThisPropertyAssignmentName(i); |
| 3458 | ASSERT(name->IsSymbol()); |
| 3459 | FieldDescriptor field(name, i, NONE); |
| 3460 | field.SetEnumerationIndex(i); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3461 | descriptors->Set(i, &field, witness); |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3462 | } |
| 3463 | descriptors->SetNextEnumerationIndex(count); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3464 | descriptors->SortUnchecked(witness); |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3465 | |
| 3466 | // The descriptors may contain duplicates because the compiler does not |
| 3467 | // guarantee the uniqueness of property names (it would have required |
| 3468 | // quadratic time). Once the descriptors are sorted we can check for |
| 3469 | // duplicates in linear time. |
| 3470 | if (HasDuplicates(descriptors)) { |
| 3471 | fun->shared()->ForbidInlineConstructor(); |
| 3472 | } else { |
| 3473 | map->set_instance_descriptors(descriptors); |
| 3474 | map->set_pre_allocated_property_fields(count); |
| 3475 | map->set_unused_property_fields(in_object_properties - count); |
| 3476 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3477 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3478 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3479 | |
| 3480 | fun->shared()->StartInobjectSlackTracking(map); |
| 3481 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3482 | return map; |
| 3483 | } |
| 3484 | |
| 3485 | |
| 3486 | void Heap::InitializeJSObjectFromMap(JSObject* obj, |
| 3487 | FixedArray* properties, |
| 3488 | Map* map) { |
| 3489 | obj->set_properties(properties); |
| 3490 | obj->initialize_elements(); |
| 3491 | // TODO(1240798): Initialize the object's body using valid initial values |
| 3492 | // according to the object's initial map. For example, if the map's |
| 3493 | // instance type is JS_ARRAY_TYPE, the length field should be initialized |
| 3494 | // to a number (eg, Smi::FromInt(0)) and the elements initialized to a |
| 3495 | // fixed array (eg, Heap::empty_fixed_array()). Currently, the object |
| 3496 | // verification code has to cope with (temporarily) invalid objects. See |
| 3497 | // for example, JSArray::JSArrayVerify). |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3498 | Object* filler; |
| 3499 | // We cannot always fill with one_pointer_filler_map because objects |
| 3500 | // created from API functions expect their internal fields to be initialized |
| 3501 | // with undefined_value. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3502 | // Pre-allocated fields need to be initialized with undefined_value as well |
| 3503 | // so that object accesses before the constructor completes (e.g. in the |
| 3504 | // debugger) will not cause a crash. |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3505 | if (map->constructor()->IsJSFunction() && |
| 3506 | JSFunction::cast(map->constructor())->shared()-> |
| 3507 | IsInobjectSlackTrackingInProgress()) { |
| 3508 | // We might want to shrink the object later. |
| 3509 | ASSERT(obj->GetInternalFieldCount() == 0); |
| 3510 | filler = Heap::one_pointer_filler_map(); |
| 3511 | } else { |
| 3512 | filler = Heap::undefined_value(); |
| 3513 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3514 | obj->InitializeBody(map, Heap::undefined_value(), filler); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3515 | } |
| 3516 | |
| 3517 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3518 | MaybeObject* Heap::AllocateJSObjectFromMap(Map* map, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3519 | // JSFunctions should be allocated using AllocateFunction to be |
| 3520 | // properly initialized. |
| 3521 | ASSERT(map->instance_type() != JS_FUNCTION_TYPE); |
| 3522 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3523 | // Both types of global objects should be allocated using |
| 3524 | // AllocateGlobalObject to be properly initialized. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3525 | ASSERT(map->instance_type() != JS_GLOBAL_OBJECT_TYPE); |
| 3526 | ASSERT(map->instance_type() != JS_BUILTINS_OBJECT_TYPE); |
| 3527 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3528 | // Allocate the backing storage for the properties. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3529 | int prop_size = |
| 3530 | map->pre_allocated_property_fields() + |
| 3531 | map->unused_property_fields() - |
| 3532 | map->inobject_properties(); |
| 3533 | ASSERT(prop_size >= 0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3534 | Object* properties; |
| 3535 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, pretenure); |
| 3536 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3537 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3538 | |
| 3539 | // Allocate the JSObject. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3540 | AllocationSpace space = |
| 3541 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3542 | if (map->instance_size() > MaxObjectSizeInPagedSpace()) space = LO_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3543 | Object* obj; |
| 3544 | { MaybeObject* maybe_obj = Allocate(map, space); |
| 3545 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3546 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3547 | |
| 3548 | // Initialize the JSObject. |
| 3549 | InitializeJSObjectFromMap(JSObject::cast(obj), |
| 3550 | FixedArray::cast(properties), |
| 3551 | map); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3552 | ASSERT(JSObject::cast(obj)->HasFastSmiOnlyElements() || |
| 3553 | JSObject::cast(obj)->HasFastElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3554 | return obj; |
| 3555 | } |
| 3556 | |
| 3557 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3558 | MaybeObject* Heap::AllocateJSObject(JSFunction* constructor, |
| 3559 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3560 | // Allocate the initial map if absent. |
| 3561 | if (!constructor->has_initial_map()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3562 | Object* initial_map; |
| 3563 | { MaybeObject* maybe_initial_map = AllocateInitialMap(constructor); |
| 3564 | if (!maybe_initial_map->ToObject(&initial_map)) return maybe_initial_map; |
| 3565 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3566 | constructor->set_initial_map(Map::cast(initial_map)); |
| 3567 | Map::cast(initial_map)->set_constructor(constructor); |
| 3568 | } |
| 3569 | // Allocate the object based on the constructors initial map. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3570 | MaybeObject* result = |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3571 | AllocateJSObjectFromMap(constructor->initial_map(), pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3572 | #ifdef DEBUG |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3573 | // Make sure result is NOT a global object if valid. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3574 | Object* non_failure; |
| 3575 | ASSERT(!result->ToObject(&non_failure) || !non_failure->IsGlobalObject()); |
| 3576 | #endif |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3577 | return result; |
| 3578 | } |
| 3579 | |
| 3580 | |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3581 | MaybeObject* Heap::AllocateJSProxy(Object* handler, Object* prototype) { |
| 3582 | // Allocate map. |
| 3583 | // TODO(rossberg): Once we optimize proxies, think about a scheme to share |
| 3584 | // 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] | 3585 | Map* map; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3586 | MaybeObject* maybe_map_obj = AllocateMap(JS_PROXY_TYPE, JSProxy::kSize); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3587 | if (!maybe_map_obj->To<Map>(&map)) return maybe_map_obj; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3588 | map->set_prototype(prototype); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3589 | |
| 3590 | // Allocate the proxy object. |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3591 | JSProxy* result; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3592 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3593 | if (!maybe_result->To<JSProxy>(&result)) return maybe_result; |
| 3594 | result->InitializeBody(map->instance_size(), Smi::FromInt(0)); |
| 3595 | result->set_handler(handler); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3596 | result->set_hash(undefined_value()); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3597 | return result; |
| 3598 | } |
| 3599 | |
| 3600 | |
| 3601 | MaybeObject* Heap::AllocateJSFunctionProxy(Object* handler, |
| 3602 | Object* call_trap, |
| 3603 | Object* construct_trap, |
| 3604 | Object* prototype) { |
| 3605 | // Allocate map. |
| 3606 | // TODO(rossberg): Once we optimize proxies, think about a scheme to share |
| 3607 | // maps. Will probably depend on the identity of the handler object, too. |
| 3608 | Map* map; |
| 3609 | MaybeObject* maybe_map_obj = |
| 3610 | AllocateMap(JS_FUNCTION_PROXY_TYPE, JSFunctionProxy::kSize); |
| 3611 | if (!maybe_map_obj->To<Map>(&map)) return maybe_map_obj; |
| 3612 | map->set_prototype(prototype); |
| 3613 | |
| 3614 | // Allocate the proxy object. |
| 3615 | JSFunctionProxy* result; |
| 3616 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3617 | if (!maybe_result->To<JSFunctionProxy>(&result)) return maybe_result; |
| 3618 | result->InitializeBody(map->instance_size(), Smi::FromInt(0)); |
| 3619 | result->set_handler(handler); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3620 | result->set_hash(undefined_value()); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3621 | result->set_call_trap(call_trap); |
| 3622 | result->set_construct_trap(construct_trap); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3623 | return result; |
| 3624 | } |
| 3625 | |
| 3626 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3627 | MaybeObject* Heap::AllocateGlobalObject(JSFunction* constructor) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3628 | ASSERT(constructor->has_initial_map()); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3629 | Map* map = constructor->initial_map(); |
| 3630 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3631 | // Make sure no field properties are described in the initial map. |
| 3632 | // This guarantees us that normalizing the properties does not |
| 3633 | // require us to change property values to JSGlobalPropertyCells. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3634 | ASSERT(map->NextFreePropertyIndex() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3635 | |
| 3636 | // Make sure we don't have a ton of pre-allocated slots in the |
| 3637 | // global objects. They will be unused once we normalize the object. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3638 | ASSERT(map->unused_property_fields() == 0); |
| 3639 | ASSERT(map->inobject_properties() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3640 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3641 | // Initial size of the backing store to avoid resize of the storage during |
| 3642 | // bootstrapping. The size differs between the JS global object ad the |
| 3643 | // builtins object. |
| 3644 | 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] | 3645 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3646 | // Allocate a dictionary object for backing storage. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3647 | Object* obj; |
| 3648 | { MaybeObject* maybe_obj = |
| 3649 | StringDictionary::Allocate( |
| 3650 | map->NumberOfDescribedProperties() * 2 + initial_size); |
| 3651 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3652 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3653 | StringDictionary* dictionary = StringDictionary::cast(obj); |
| 3654 | |
| 3655 | // The global object might be created from an object template with accessors. |
| 3656 | // Fill these accessors into the dictionary. |
| 3657 | DescriptorArray* descs = map->instance_descriptors(); |
| 3658 | for (int i = 0; i < descs->number_of_descriptors(); i++) { |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 3659 | PropertyDetails details(descs->GetDetails(i)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3660 | ASSERT(details.type() == CALLBACKS); // Only accessors are expected. |
| 3661 | PropertyDetails d = |
| 3662 | PropertyDetails(details.attributes(), CALLBACKS, details.index()); |
| 3663 | Object* value = descs->GetCallbacksObject(i); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3664 | { MaybeObject* maybe_value = AllocateJSGlobalPropertyCell(value); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3665 | if (!maybe_value->ToObject(&value)) return maybe_value; |
| 3666 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3667 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3668 | Object* result; |
| 3669 | { MaybeObject* maybe_result = dictionary->Add(descs->GetKey(i), value, d); |
| 3670 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3671 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3672 | dictionary = StringDictionary::cast(result); |
| 3673 | } |
| 3674 | |
| 3675 | // Allocate the global object and initialize it with the backing store. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3676 | { MaybeObject* maybe_obj = Allocate(map, OLD_POINTER_SPACE); |
| 3677 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3678 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3679 | JSObject* global = JSObject::cast(obj); |
| 3680 | InitializeJSObjectFromMap(global, dictionary, map); |
| 3681 | |
| 3682 | // Create a new map for the global object. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3683 | { MaybeObject* maybe_obj = map->CopyDropDescriptors(); |
| 3684 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3685 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3686 | Map* new_map = Map::cast(obj); |
| 3687 | |
| 3688 | // Setup the global object as a normalized object. |
| 3689 | global->set_map(new_map); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3690 | global->map()->clear_instance_descriptors(); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3691 | global->set_properties(dictionary); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3692 | |
| 3693 | // Make sure result is a global object with properties in dictionary. |
| 3694 | ASSERT(global->IsGlobalObject()); |
| 3695 | ASSERT(!global->HasFastProperties()); |
| 3696 | return global; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3697 | } |
| 3698 | |
| 3699 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3700 | MaybeObject* Heap::CopyJSObject(JSObject* source) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3701 | // Never used to copy functions. If functions need to be copied we |
| 3702 | // have to be careful to clear the literals array. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3703 | SLOW_ASSERT(!source->IsJSFunction()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3704 | |
| 3705 | // Make the clone. |
| 3706 | Map* map = source->map(); |
| 3707 | int object_size = map->instance_size(); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3708 | Object* clone; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3709 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3710 | WriteBarrierMode wb_mode = UPDATE_WRITE_BARRIER; |
| 3711 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3712 | // If we're forced to always allocate, we use the general allocation |
| 3713 | // functions which may leave us with an object in old space. |
| 3714 | if (always_allocate()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3715 | { MaybeObject* maybe_clone = |
| 3716 | AllocateRaw(object_size, NEW_SPACE, OLD_POINTER_SPACE); |
| 3717 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3718 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3719 | Address clone_address = HeapObject::cast(clone)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3720 | CopyBlock(clone_address, |
| 3721 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3722 | object_size); |
| 3723 | // Update write barrier for all fields that lie beyond the header. |
vegorov@chromium.org | f837290 | 2010-03-15 10:26:20 +0000 | [diff] [blame] | 3724 | RecordWrites(clone_address, |
| 3725 | JSObject::kHeaderSize, |
antonm@chromium.org | 8e5e338 | 2010-03-24 09:56:30 +0000 | [diff] [blame] | 3726 | (object_size - JSObject::kHeaderSize) / kPointerSize); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3727 | } else { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3728 | wb_mode = SKIP_WRITE_BARRIER; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3729 | { MaybeObject* maybe_clone = new_space_.AllocateRaw(object_size); |
| 3730 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3731 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3732 | SLOW_ASSERT(InNewSpace(clone)); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3733 | // 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] | 3734 | // the contents without worrying about updating the write barrier. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3735 | CopyBlock(HeapObject::cast(clone)->address(), |
| 3736 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3737 | object_size); |
| 3738 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3739 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3740 | SLOW_ASSERT( |
| 3741 | JSObject::cast(clone)->GetElementsKind() == source->GetElementsKind()); |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3742 | FixedArrayBase* elements = FixedArrayBase::cast(source->elements()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3743 | FixedArray* properties = FixedArray::cast(source->properties()); |
| 3744 | // Update elements if necessary. |
ager@chromium.org | b26c50a | 2010-03-26 09:27:16 +0000 | [diff] [blame] | 3745 | if (elements->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3746 | Object* elem; |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3747 | { MaybeObject* maybe_elem; |
| 3748 | if (elements->map() == fixed_cow_array_map()) { |
| 3749 | maybe_elem = FixedArray::cast(elements); |
| 3750 | } else if (source->HasFastDoubleElements()) { |
| 3751 | maybe_elem = CopyFixedDoubleArray(FixedDoubleArray::cast(elements)); |
| 3752 | } else { |
| 3753 | maybe_elem = CopyFixedArray(FixedArray::cast(elements)); |
| 3754 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3755 | if (!maybe_elem->ToObject(&elem)) return maybe_elem; |
| 3756 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3757 | JSObject::cast(clone)->set_elements(FixedArrayBase::cast(elem), wb_mode); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3758 | } |
| 3759 | // Update properties if necessary. |
| 3760 | if (properties->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3761 | Object* prop; |
| 3762 | { MaybeObject* maybe_prop = CopyFixedArray(properties); |
| 3763 | if (!maybe_prop->ToObject(&prop)) return maybe_prop; |
| 3764 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 3765 | JSObject::cast(clone)->set_properties(FixedArray::cast(prop), wb_mode); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3766 | } |
| 3767 | // Return the new clone. |
| 3768 | return clone; |
| 3769 | } |
| 3770 | |
| 3771 | |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3772 | MaybeObject* Heap::ReinitializeJSReceiver( |
| 3773 | JSReceiver* object, InstanceType type, int size) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3774 | ASSERT(type >= FIRST_JS_OBJECT_TYPE); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3775 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3776 | // Allocate fresh map. |
| 3777 | // TODO(rossberg): Once we optimize proxies, cache these maps. |
| 3778 | Map* map; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3779 | MaybeObject* maybe = AllocateMap(type, size); |
| 3780 | if (!maybe->To<Map>(&map)) return maybe; |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3781 | |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3782 | // Check that the receiver has at least the size of the fresh object. |
| 3783 | int size_difference = object->map()->instance_size() - map->instance_size(); |
| 3784 | ASSERT(size_difference >= 0); |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3785 | |
| 3786 | map->set_prototype(object->map()->prototype()); |
| 3787 | |
| 3788 | // Allocate the backing storage for the properties. |
| 3789 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
| 3790 | Object* properties; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3791 | maybe = AllocateFixedArray(prop_size, TENURED); |
| 3792 | if (!maybe->ToObject(&properties)) return maybe; |
| 3793 | |
| 3794 | // Functions require some allocation, which might fail here. |
| 3795 | SharedFunctionInfo* shared = NULL; |
| 3796 | if (type == JS_FUNCTION_TYPE) { |
| 3797 | String* name; |
| 3798 | maybe = LookupAsciiSymbol("<freezing call trap>"); |
| 3799 | if (!maybe->To<String>(&name)) return maybe; |
| 3800 | maybe = AllocateSharedFunctionInfo(name); |
| 3801 | if (!maybe->To<SharedFunctionInfo>(&shared)) return maybe; |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3802 | } |
| 3803 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3804 | // Because of possible retries of this function after failure, |
| 3805 | // we must NOT fail after this point, where we have changed the type! |
| 3806 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3807 | // Reset the map for the object. |
| 3808 | object->set_map(map); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3809 | JSObject* jsobj = JSObject::cast(object); |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3810 | |
| 3811 | // Reinitialize the object from the constructor map. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3812 | InitializeJSObjectFromMap(jsobj, FixedArray::cast(properties), map); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3813 | |
| 3814 | // Functions require some minimal initialization. |
| 3815 | if (type == JS_FUNCTION_TYPE) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 3816 | map->set_function_with_prototype(true); |
| 3817 | InitializeFunction(JSFunction::cast(object), shared, the_hole_value()); |
| 3818 | JSFunction::cast(object)->set_context( |
| 3819 | isolate()->context()->global_context()); |
lrn@chromium.org | 34e6078 | 2011-09-15 07:25:40 +0000 | [diff] [blame] | 3820 | } |
| 3821 | |
| 3822 | // Put in filler if the new object is smaller than the old. |
| 3823 | if (size_difference > 0) { |
| 3824 | CreateFillerObjectAt( |
| 3825 | object->address() + map->instance_size(), size_difference); |
| 3826 | } |
| 3827 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3828 | return object; |
| 3829 | } |
| 3830 | |
| 3831 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3832 | MaybeObject* Heap::ReinitializeJSGlobalProxy(JSFunction* constructor, |
| 3833 | JSGlobalProxy* object) { |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3834 | ASSERT(constructor->has_initial_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3835 | Map* map = constructor->initial_map(); |
| 3836 | |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3837 | // 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] | 3838 | // objects allocated using the constructor. |
| 3839 | ASSERT(map->instance_size() == object->map()->instance_size()); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3840 | ASSERT(map->instance_type() == object->map()->instance_type()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3841 | |
| 3842 | // Allocate the backing storage for the properties. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3843 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3844 | Object* properties; |
| 3845 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, TENURED); |
| 3846 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3847 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3848 | |
| 3849 | // Reset the map for the object. |
| 3850 | object->set_map(constructor->initial_map()); |
| 3851 | |
| 3852 | // Reinitialize the object from the constructor map. |
| 3853 | InitializeJSObjectFromMap(object, FixedArray::cast(properties), map); |
| 3854 | return object; |
| 3855 | } |
| 3856 | |
| 3857 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3858 | MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string, |
| 3859 | PretenureFlag pretenure) { |
ricow@chromium.org | 55ee807 | 2011-09-08 16:33:10 +0000 | [diff] [blame] | 3860 | if (string.length() == 1) { |
| 3861 | return Heap::LookupSingleCharacterStringFromCode(string[0]); |
| 3862 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3863 | Object* result; |
| 3864 | { MaybeObject* maybe_result = |
| 3865 | AllocateRawAsciiString(string.length(), pretenure); |
| 3866 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3867 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3868 | |
| 3869 | // Copy the characters into the new object. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3870 | SeqAsciiString* string_result = SeqAsciiString::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3871 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3872 | string_result->SeqAsciiStringSet(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3873 | } |
| 3874 | return result; |
| 3875 | } |
| 3876 | |
| 3877 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3878 | MaybeObject* Heap::AllocateStringFromUtf8Slow(Vector<const char> string, |
| 3879 | PretenureFlag pretenure) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3880 | // V8 only supports characters in the Basic Multilingual Plane. |
| 3881 | const uc32 kMaxSupportedChar = 0xFFFF; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3882 | // Count the number of characters in the UTF-8 string and check if |
| 3883 | // it is an ASCII string. |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 3884 | Access<UnicodeCache::Utf8Decoder> |
| 3885 | decoder(isolate_->unicode_cache()->utf8_decoder()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3886 | decoder->Reset(string.start(), string.length()); |
| 3887 | int chars = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3888 | while (decoder->has_more()) { |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3889 | decoder->GetNext(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3890 | chars++; |
| 3891 | } |
| 3892 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3893 | Object* result; |
| 3894 | { MaybeObject* maybe_result = AllocateRawTwoByteString(chars, pretenure); |
| 3895 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3896 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3897 | |
| 3898 | // Convert and copy the characters into the new object. |
| 3899 | String* string_result = String::cast(result); |
| 3900 | decoder->Reset(string.start(), string.length()); |
| 3901 | for (int i = 0; i < chars; i++) { |
| 3902 | uc32 r = decoder->GetNext(); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3903 | if (r > kMaxSupportedChar) { r = unibrow::Utf8::kBadChar; } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3904 | string_result->Set(i, r); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3905 | } |
| 3906 | return result; |
| 3907 | } |
| 3908 | |
| 3909 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3910 | MaybeObject* Heap::AllocateStringFromTwoByte(Vector<const uc16> string, |
| 3911 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3912 | // Check if the string is an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3913 | MaybeObject* maybe_result; |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3914 | if (String::IsAscii(string.start(), string.length())) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3915 | maybe_result = AllocateRawAsciiString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3916 | } else { // It's not an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3917 | maybe_result = AllocateRawTwoByteString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3918 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3919 | Object* result; |
| 3920 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3921 | |
| 3922 | // Copy the characters into the new object, which may be either ASCII or |
| 3923 | // UTF-16. |
| 3924 | String* string_result = String::cast(result); |
| 3925 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3926 | string_result->Set(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3927 | } |
| 3928 | return result; |
| 3929 | } |
| 3930 | |
| 3931 | |
| 3932 | Map* Heap::SymbolMapForString(String* string) { |
| 3933 | // If the string is in new space it cannot be used as a symbol. |
| 3934 | if (InNewSpace(string)) return NULL; |
| 3935 | |
| 3936 | // Find the corresponding symbol map for strings. |
| 3937 | Map* map = string->map(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3938 | if (map == ascii_string_map()) { |
| 3939 | return ascii_symbol_map(); |
| 3940 | } |
| 3941 | if (map == string_map()) { |
| 3942 | return symbol_map(); |
| 3943 | } |
| 3944 | if (map == cons_string_map()) { |
| 3945 | return cons_symbol_map(); |
| 3946 | } |
| 3947 | if (map == cons_ascii_string_map()) { |
| 3948 | return cons_ascii_symbol_map(); |
| 3949 | } |
| 3950 | if (map == external_string_map()) { |
| 3951 | return external_symbol_map(); |
| 3952 | } |
| 3953 | if (map == external_ascii_string_map()) { |
| 3954 | return external_ascii_symbol_map(); |
| 3955 | } |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 3956 | if (map == external_string_with_ascii_data_map()) { |
| 3957 | return external_symbol_with_ascii_data_map(); |
| 3958 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3959 | |
| 3960 | // No match found. |
| 3961 | return NULL; |
| 3962 | } |
| 3963 | |
| 3964 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3965 | MaybeObject* Heap::AllocateInternalSymbol(unibrow::CharacterStream* buffer, |
| 3966 | int chars, |
| 3967 | uint32_t hash_field) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3968 | ASSERT(chars >= 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3969 | // Ensure the chars matches the number of characters in the buffer. |
| 3970 | ASSERT(static_cast<unsigned>(chars) == buffer->Length()); |
| 3971 | // Determine whether the string is ascii. |
| 3972 | bool is_ascii = true; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3973 | while (buffer->has_more()) { |
| 3974 | if (buffer->GetNext() > unibrow::Utf8::kMaxOneByteChar) { |
| 3975 | is_ascii = false; |
| 3976 | break; |
| 3977 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3978 | } |
| 3979 | buffer->Rewind(); |
| 3980 | |
| 3981 | // Compute map and object size. |
| 3982 | int size; |
| 3983 | Map* map; |
| 3984 | |
| 3985 | if (is_ascii) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3986 | if (chars > SeqAsciiString::kMaxLength) { |
| 3987 | return Failure::OutOfMemoryException(); |
| 3988 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3989 | map = ascii_symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3990 | size = SeqAsciiString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3991 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3992 | if (chars > SeqTwoByteString::kMaxLength) { |
| 3993 | return Failure::OutOfMemoryException(); |
| 3994 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3995 | map = symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3996 | size = SeqTwoByteString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3997 | } |
| 3998 | |
| 3999 | // Allocate string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4000 | Object* result; |
| 4001 | { MaybeObject* maybe_result = (size > MaxObjectSizeInPagedSpace()) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4002 | ? lo_space_->AllocateRaw(size, NOT_EXECUTABLE) |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4003 | : old_data_space_->AllocateRaw(size); |
| 4004 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4005 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4006 | |
| 4007 | reinterpret_cast<HeapObject*>(result)->set_map(map); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4008 | // Set length and hash fields of the allocated string. |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 4009 | String* answer = String::cast(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4010 | answer->set_length(chars); |
| 4011 | answer->set_hash_field(hash_field); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4012 | |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 4013 | ASSERT_EQ(size, answer->Size()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4014 | |
| 4015 | // Fill in the characters. |
| 4016 | for (int i = 0; i < chars; i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 4017 | answer->Set(i, buffer->GetNext()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4018 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 4019 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4020 | } |
| 4021 | |
| 4022 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4023 | MaybeObject* Heap::AllocateRawAsciiString(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4024 | if (length < 0 || length > SeqAsciiString::kMaxLength) { |
| 4025 | return Failure::OutOfMemoryException(); |
| 4026 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4027 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4028 | int size = SeqAsciiString::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4029 | ASSERT(size <= SeqAsciiString::kMaxSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4030 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4031 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 4032 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 4033 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4034 | if (space == NEW_SPACE) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4035 | if (size > kMaxObjectSizeInNewSpace) { |
| 4036 | // Allocate in large object space, retry space will be ignored. |
| 4037 | space = LO_SPACE; |
| 4038 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 4039 | // Allocate in new space, retry in large object space. |
| 4040 | retry_space = LO_SPACE; |
| 4041 | } |
| 4042 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 4043 | space = LO_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4044 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4045 | Object* result; |
| 4046 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 4047 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4048 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4049 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4050 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4051 | HeapObject::cast(result)->set_map(ascii_string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4052 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4053 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4054 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 4055 | return result; |
| 4056 | } |
| 4057 | |
| 4058 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4059 | MaybeObject* Heap::AllocateRawTwoByteString(int length, |
| 4060 | PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4061 | if (length < 0 || length > SeqTwoByteString::kMaxLength) { |
| 4062 | return Failure::OutOfMemoryException(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4063 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4064 | int size = SeqTwoByteString::SizeFor(length); |
| 4065 | ASSERT(size <= SeqTwoByteString::kMaxSize); |
| 4066 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 4067 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 4068 | |
| 4069 | if (space == NEW_SPACE) { |
| 4070 | if (size > kMaxObjectSizeInNewSpace) { |
| 4071 | // Allocate in large object space, retry space will be ignored. |
| 4072 | space = LO_SPACE; |
| 4073 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 4074 | // Allocate in new space, retry in large object space. |
| 4075 | retry_space = LO_SPACE; |
| 4076 | } |
| 4077 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 4078 | space = LO_SPACE; |
| 4079 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4080 | Object* result; |
| 4081 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 4082 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4083 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4084 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4085 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4086 | HeapObject::cast(result)->set_map(string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4087 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4088 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4089 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 4090 | return result; |
| 4091 | } |
| 4092 | |
| 4093 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4094 | MaybeObject* Heap::AllocateEmptyFixedArray() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4095 | int size = FixedArray::SizeFor(0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4096 | Object* result; |
| 4097 | { MaybeObject* maybe_result = |
| 4098 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 4099 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4100 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4101 | // Initialize the object. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4102 | reinterpret_cast<FixedArray*>(result)->set_map(fixed_array_map()); |
| 4103 | reinterpret_cast<FixedArray*>(result)->set_length(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4104 | return result; |
| 4105 | } |
| 4106 | |
| 4107 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4108 | MaybeObject* Heap::AllocateRawFixedArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4109 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 4110 | return Failure::OutOfMemoryException(); |
| 4111 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 4112 | ASSERT(length > 0); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 4113 | // Use the general function if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4114 | if (always_allocate()) return AllocateFixedArray(length, TENURED); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4115 | // Allocate the raw data for a fixed array. |
| 4116 | int size = FixedArray::SizeFor(length); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4117 | return size <= kMaxObjectSizeInNewSpace |
| 4118 | ? new_space_.AllocateRaw(size) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4119 | : lo_space_->AllocateRaw(size, NOT_EXECUTABLE); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4120 | } |
| 4121 | |
| 4122 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4123 | MaybeObject* Heap::CopyFixedArrayWithMap(FixedArray* src, Map* map) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4124 | int len = src->length(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4125 | Object* obj; |
| 4126 | { MaybeObject* maybe_obj = AllocateRawFixedArray(len); |
| 4127 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4128 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4129 | if (InNewSpace(obj)) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4130 | HeapObject* dst = HeapObject::cast(obj); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 4131 | dst->set_map(map); |
| 4132 | CopyBlock(dst->address() + kPointerSize, |
| 4133 | src->address() + kPointerSize, |
| 4134 | FixedArray::SizeFor(len) - kPointerSize); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4135 | return obj; |
| 4136 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 4137 | HeapObject::cast(obj)->set_map(map); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4138 | FixedArray* result = FixedArray::cast(obj); |
| 4139 | result->set_length(len); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4140 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4141 | // Copy the content |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4142 | AssertNoAllocation no_gc; |
| 4143 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4144 | for (int i = 0; i < len; i++) result->set(i, src->get(i), mode); |
| 4145 | return result; |
| 4146 | } |
| 4147 | |
| 4148 | |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 4149 | MaybeObject* Heap::CopyFixedDoubleArrayWithMap(FixedDoubleArray* src, |
| 4150 | Map* map) { |
| 4151 | int len = src->length(); |
| 4152 | Object* obj; |
| 4153 | { MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(len, NOT_TENURED); |
| 4154 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4155 | } |
| 4156 | HeapObject* dst = HeapObject::cast(obj); |
| 4157 | dst->set_map(map); |
| 4158 | CopyBlock( |
| 4159 | dst->address() + FixedDoubleArray::kLengthOffset, |
| 4160 | src->address() + FixedDoubleArray::kLengthOffset, |
| 4161 | FixedDoubleArray::SizeFor(len) - FixedDoubleArray::kLengthOffset); |
| 4162 | return obj; |
| 4163 | } |
| 4164 | |
| 4165 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4166 | MaybeObject* Heap::AllocateFixedArray(int length) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 4167 | ASSERT(length >= 0); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 4168 | if (length == 0) return empty_fixed_array(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4169 | Object* result; |
| 4170 | { MaybeObject* maybe_result = AllocateRawFixedArray(length); |
| 4171 | if (!maybe_result->ToObject(&result)) return maybe_result; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4172 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4173 | // Initialize header. |
| 4174 | FixedArray* array = reinterpret_cast<FixedArray*>(result); |
| 4175 | array->set_map(fixed_array_map()); |
| 4176 | array->set_length(length); |
| 4177 | // Initialize body. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4178 | ASSERT(!InNewSpace(undefined_value())); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4179 | MemsetPointer(array->data_start(), undefined_value(), length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4180 | return result; |
| 4181 | } |
| 4182 | |
| 4183 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4184 | MaybeObject* Heap::AllocateRawFixedArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4185 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 4186 | return Failure::OutOfMemoryException(); |
| 4187 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4188 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4189 | AllocationSpace space = |
| 4190 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4191 | int size = FixedArray::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4192 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 4193 | // Too big for new space. |
| 4194 | space = LO_SPACE; |
| 4195 | } else if (space == OLD_POINTER_SPACE && |
| 4196 | size > MaxObjectSizeInPagedSpace()) { |
| 4197 | // Too big for old pointer space. |
| 4198 | space = LO_SPACE; |
| 4199 | } |
| 4200 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4201 | AllocationSpace retry_space = |
| 4202 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_POINTER_SPACE : LO_SPACE; |
| 4203 | |
| 4204 | return AllocateRaw(size, space, retry_space); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4205 | } |
| 4206 | |
| 4207 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4208 | MUST_USE_RESULT static MaybeObject* AllocateFixedArrayWithFiller( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4209 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4210 | int length, |
| 4211 | PretenureFlag pretenure, |
| 4212 | Object* filler) { |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4213 | ASSERT(length >= 0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4214 | ASSERT(heap->empty_fixed_array()->IsFixedArray()); |
| 4215 | if (length == 0) return heap->empty_fixed_array(); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4216 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4217 | ASSERT(!heap->InNewSpace(filler)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4218 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4219 | { MaybeObject* maybe_result = heap->AllocateRawFixedArray(length, pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4220 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4221 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4222 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4223 | HeapObject::cast(result)->set_map(heap->fixed_array_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4224 | FixedArray* array = FixedArray::cast(result); |
| 4225 | array->set_length(length); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4226 | MemsetPointer(array->data_start(), filler, length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4227 | return array; |
| 4228 | } |
| 4229 | |
| 4230 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4231 | MaybeObject* Heap::AllocateFixedArray(int length, PretenureFlag pretenure) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4232 | return AllocateFixedArrayWithFiller(this, |
| 4233 | length, |
| 4234 | pretenure, |
| 4235 | undefined_value()); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4236 | } |
| 4237 | |
| 4238 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4239 | MaybeObject* Heap::AllocateFixedArrayWithHoles(int length, |
| 4240 | PretenureFlag pretenure) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4241 | return AllocateFixedArrayWithFiller(this, |
| 4242 | length, |
| 4243 | pretenure, |
| 4244 | the_hole_value()); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 4245 | } |
| 4246 | |
| 4247 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4248 | MaybeObject* Heap::AllocateUninitializedFixedArray(int length) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4249 | if (length == 0) return empty_fixed_array(); |
| 4250 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4251 | Object* obj; |
| 4252 | { MaybeObject* maybe_obj = AllocateRawFixedArray(length); |
| 4253 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4254 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4255 | |
| 4256 | reinterpret_cast<FixedArray*>(obj)->set_map(fixed_array_map()); |
| 4257 | FixedArray::cast(obj)->set_length(length); |
| 4258 | return obj; |
| 4259 | } |
| 4260 | |
| 4261 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4262 | MaybeObject* Heap::AllocateEmptyFixedDoubleArray() { |
| 4263 | int size = FixedDoubleArray::SizeFor(0); |
| 4264 | Object* result; |
| 4265 | { MaybeObject* maybe_result = |
| 4266 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 4267 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4268 | } |
| 4269 | // Initialize the object. |
| 4270 | reinterpret_cast<FixedDoubleArray*>(result)->set_map( |
| 4271 | fixed_double_array_map()); |
| 4272 | reinterpret_cast<FixedDoubleArray*>(result)->set_length(0); |
| 4273 | return result; |
| 4274 | } |
| 4275 | |
| 4276 | |
| 4277 | MaybeObject* Heap::AllocateUninitializedFixedDoubleArray( |
| 4278 | int length, |
| 4279 | PretenureFlag pretenure) { |
| 4280 | if (length == 0) return empty_fixed_double_array(); |
| 4281 | |
| 4282 | Object* obj; |
| 4283 | { MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(length, pretenure); |
| 4284 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 4285 | } |
| 4286 | |
| 4287 | reinterpret_cast<FixedDoubleArray*>(obj)->set_map(fixed_double_array_map()); |
| 4288 | FixedDoubleArray::cast(obj)->set_length(length); |
| 4289 | return obj; |
| 4290 | } |
| 4291 | |
| 4292 | |
| 4293 | MaybeObject* Heap::AllocateRawFixedDoubleArray(int length, |
| 4294 | PretenureFlag pretenure) { |
| 4295 | if (length < 0 || length > FixedDoubleArray::kMaxLength) { |
| 4296 | return Failure::OutOfMemoryException(); |
| 4297 | } |
| 4298 | |
| 4299 | AllocationSpace space = |
| 4300 | (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 4301 | int size = FixedDoubleArray::SizeFor(length); |
| 4302 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 4303 | // Too big for new space. |
| 4304 | space = LO_SPACE; |
| 4305 | } else if (space == OLD_DATA_SPACE && |
| 4306 | size > MaxObjectSizeInPagedSpace()) { |
| 4307 | // Too big for old data space. |
| 4308 | space = LO_SPACE; |
| 4309 | } |
| 4310 | |
| 4311 | AllocationSpace retry_space = |
| 4312 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_DATA_SPACE : LO_SPACE; |
| 4313 | |
| 4314 | return AllocateRaw(size, space, retry_space); |
| 4315 | } |
| 4316 | |
| 4317 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4318 | MaybeObject* Heap::AllocateHashTable(int length, PretenureFlag pretenure) { |
| 4319 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4320 | { MaybeObject* maybe_result = AllocateFixedArray(length, pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4321 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4322 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4323 | reinterpret_cast<HeapObject*>(result)->set_map(hash_table_map()); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 4324 | ASSERT(result->IsHashTable()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4325 | return result; |
| 4326 | } |
| 4327 | |
| 4328 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4329 | MaybeObject* Heap::AllocateGlobalContext() { |
| 4330 | Object* result; |
| 4331 | { MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4332 | AllocateFixedArray(Context::GLOBAL_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4333 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4334 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4335 | Context* context = reinterpret_cast<Context*>(result); |
| 4336 | context->set_map(global_context_map()); |
| 4337 | ASSERT(context->IsGlobalContext()); |
| 4338 | ASSERT(result->IsContext()); |
| 4339 | return result; |
| 4340 | } |
| 4341 | |
| 4342 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4343 | MaybeObject* Heap::AllocateFunctionContext(int length, JSFunction* function) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4344 | ASSERT(length >= Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4345 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4346 | { MaybeObject* maybe_result = AllocateFixedArray(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4347 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4348 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4349 | Context* context = reinterpret_cast<Context*>(result); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4350 | context->set_map(function_context_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4351 | context->set_closure(function); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4352 | context->set_previous(function->context()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4353 | context->set_extension(NULL); |
| 4354 | context->set_global(function->context()->global()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4355 | return context; |
| 4356 | } |
| 4357 | |
| 4358 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4359 | MaybeObject* Heap::AllocateCatchContext(JSFunction* function, |
| 4360 | Context* previous, |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4361 | String* name, |
| 4362 | Object* thrown_object) { |
| 4363 | STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == Context::THROWN_OBJECT_INDEX); |
| 4364 | Object* result; |
| 4365 | { MaybeObject* maybe_result = |
| 4366 | AllocateFixedArray(Context::MIN_CONTEXT_SLOTS + 1); |
| 4367 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4368 | } |
| 4369 | Context* context = reinterpret_cast<Context*>(result); |
| 4370 | context->set_map(catch_context_map()); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4371 | context->set_closure(function); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4372 | context->set_previous(previous); |
| 4373 | context->set_extension(name); |
| 4374 | context->set_global(previous->global()); |
| 4375 | context->set(Context::THROWN_OBJECT_INDEX, thrown_object); |
| 4376 | return context; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4377 | } |
| 4378 | |
| 4379 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4380 | MaybeObject* Heap::AllocateWithContext(JSFunction* function, |
| 4381 | Context* previous, |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4382 | JSObject* extension) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4383 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4384 | { MaybeObject* maybe_result = AllocateFixedArray(Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4385 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4386 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4387 | Context* context = reinterpret_cast<Context*>(result); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4388 | context->set_map(with_context_map()); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4389 | context->set_closure(function); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4390 | context->set_previous(previous); |
| 4391 | context->set_extension(extension); |
| 4392 | context->set_global(previous->global()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4393 | return context; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4394 | } |
| 4395 | |
| 4396 | |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4397 | MaybeObject* Heap::AllocateBlockContext(JSFunction* function, |
| 4398 | Context* previous, |
| 4399 | SerializedScopeInfo* scope_info) { |
| 4400 | Object* result; |
| 4401 | { MaybeObject* maybe_result = |
yangguo@chromium.org | 80c42ed | 2011-08-31 09:03:56 +0000 | [diff] [blame] | 4402 | AllocateFixedArrayWithHoles(scope_info->NumberOfContextSlots()); |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4403 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4404 | } |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame] | 4405 | Context* context = reinterpret_cast<Context*>(result); |
| 4406 | context->set_map(block_context_map()); |
| 4407 | context->set_closure(function); |
| 4408 | context->set_previous(previous); |
| 4409 | context->set_extension(scope_info); |
| 4410 | context->set_global(previous->global()); |
| 4411 | return context; |
| 4412 | } |
| 4413 | |
| 4414 | |
| 4415 | MaybeObject* Heap::AllocateSerializedScopeInfo(int length) { |
| 4416 | Object* result; |
| 4417 | { MaybeObject* maybe_result = AllocateFixedArray(length, TENURED); |
| 4418 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4419 | } |
| 4420 | SerializedScopeInfo* scope_info = |
| 4421 | reinterpret_cast<SerializedScopeInfo*>(result); |
| 4422 | scope_info->set_map(serialized_scope_info_map()); |
| 4423 | return scope_info; |
| 4424 | } |
| 4425 | |
| 4426 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4427 | MaybeObject* Heap::AllocateStruct(InstanceType type) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4428 | Map* map; |
| 4429 | switch (type) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4430 | #define MAKE_CASE(NAME, Name, name) \ |
| 4431 | case NAME##_TYPE: map = name##_map(); break; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4432 | STRUCT_LIST(MAKE_CASE) |
| 4433 | #undef MAKE_CASE |
| 4434 | default: |
| 4435 | UNREACHABLE(); |
| 4436 | return Failure::InternalError(); |
| 4437 | } |
| 4438 | int size = map->instance_size(); |
| 4439 | AllocationSpace space = |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4440 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : OLD_POINTER_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4441 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4442 | { MaybeObject* maybe_result = Allocate(map, space); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4443 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4444 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4445 | Struct::cast(result)->InitializeBody(size); |
| 4446 | return result; |
| 4447 | } |
| 4448 | |
| 4449 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4450 | bool Heap::IsHeapIterable() { |
| 4451 | return (!old_pointer_space()->was_swept_conservatively() && |
| 4452 | !old_data_space()->was_swept_conservatively()); |
| 4453 | } |
| 4454 | |
| 4455 | |
| 4456 | void Heap::EnsureHeapIsIterable() { |
| 4457 | ASSERT(IsAllocationAllowed()); |
| 4458 | if (!IsHeapIterable()) { |
| 4459 | CollectAllGarbage(kMakeHeapIterableMask); |
| 4460 | } |
| 4461 | ASSERT(IsHeapIterable()); |
| 4462 | } |
| 4463 | |
| 4464 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4465 | bool Heap::IdleNotification() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4466 | static const int kIdlesBeforeScavenge = 4; |
| 4467 | static const int kIdlesBeforeMarkSweep = 7; |
| 4468 | static const int kIdlesBeforeMarkCompact = 8; |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4469 | static const int kMaxIdleCount = kIdlesBeforeMarkCompact + 1; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 4470 | static const unsigned int kGCsBetweenCleanup = 4; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4471 | |
| 4472 | if (!last_idle_notification_gc_count_init_) { |
| 4473 | last_idle_notification_gc_count_ = gc_count_; |
| 4474 | last_idle_notification_gc_count_init_ = true; |
| 4475 | } |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4476 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4477 | bool uncommit = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4478 | bool finished = false; |
| 4479 | |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4480 | // Reset the number of idle notifications received when a number of |
| 4481 | // GCs have taken place. This allows another round of cleanup based |
| 4482 | // on idle notifications if enough work has been carried out to |
| 4483 | // provoke a number of garbage collections. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4484 | if (gc_count_ - last_idle_notification_gc_count_ < kGCsBetweenCleanup) { |
| 4485 | number_idle_notifications_ = |
| 4486 | Min(number_idle_notifications_ + 1, kMaxIdleCount); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4487 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4488 | number_idle_notifications_ = 0; |
| 4489 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4490 | } |
| 4491 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4492 | if (number_idle_notifications_ == kIdlesBeforeScavenge) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4493 | if (contexts_disposed_ > 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4494 | HistogramTimerScope scope(isolate_->counters()->gc_context()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4495 | CollectAllGarbage(kNoGCFlags); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4496 | } else { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 4497 | CollectGarbage(NEW_SPACE); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4498 | } |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4499 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4500 | last_idle_notification_gc_count_ = gc_count_; |
| 4501 | } else if (number_idle_notifications_ == kIdlesBeforeMarkSweep) { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4502 | // Before doing the mark-sweep collections we clear the |
| 4503 | // compilation cache to avoid hanging on to source code and |
| 4504 | // generated code for cached functions. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4505 | isolate_->compilation_cache()->Clear(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4506 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4507 | CollectAllGarbage(kNoGCFlags); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4508 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4509 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4510 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4511 | } else if (number_idle_notifications_ == kIdlesBeforeMarkCompact) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4512 | CollectAllGarbage(kNoGCFlags); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4513 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4514 | last_idle_notification_gc_count_ = gc_count_; |
| 4515 | number_idle_notifications_ = 0; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4516 | finished = true; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4517 | } else if (contexts_disposed_ > 0) { |
| 4518 | if (FLAG_expose_gc) { |
| 4519 | contexts_disposed_ = 0; |
| 4520 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4521 | HistogramTimerScope scope(isolate_->counters()->gc_context()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4522 | CollectAllGarbage(kNoGCFlags); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4523 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4524 | } |
| 4525 | // If this is the first idle notification, we reset the |
| 4526 | // notification count to avoid letting idle notifications for |
| 4527 | // context disposal garbage collections start a potentially too |
| 4528 | // aggressive idle GC cycle. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4529 | if (number_idle_notifications_ <= 1) { |
| 4530 | number_idle_notifications_ = 0; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4531 | uncommit = false; |
| 4532 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4533 | } else if (number_idle_notifications_ > kIdlesBeforeMarkCompact) { |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4534 | // If we have received more than kIdlesBeforeMarkCompact idle |
| 4535 | // notifications we do not perform any cleanup because we don't |
| 4536 | // expect to gain much by doing so. |
| 4537 | finished = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4538 | } |
| 4539 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4540 | // Make sure that we have no pending context disposals and |
| 4541 | // conditionally uncommit from space. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4542 | // Take into account that we might have decided to delay full collection |
| 4543 | // because incremental marking is in progress. |
| 4544 | ASSERT((contexts_disposed_ == 0) || !incremental_marking()->IsStopped()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4545 | if (uncommit) UncommitFromSpace(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4546 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4547 | return finished; |
| 4548 | } |
| 4549 | |
| 4550 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4551 | #ifdef DEBUG |
| 4552 | |
| 4553 | void Heap::Print() { |
| 4554 | if (!HasBeenSetup()) return; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4555 | isolate()->PrintStack(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4556 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4557 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4558 | space->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4559 | } |
| 4560 | |
| 4561 | |
| 4562 | void Heap::ReportCodeStatistics(const char* title) { |
| 4563 | PrintF(">>>>>> Code Stats (%s) >>>>>>\n", title); |
| 4564 | PagedSpace::ResetCodeStatistics(); |
| 4565 | // We do not look for code in new space, map space, or old space. If code |
| 4566 | // somehow ends up in those spaces, we would miss it here. |
| 4567 | code_space_->CollectCodeStatistics(); |
| 4568 | lo_space_->CollectCodeStatistics(); |
| 4569 | PagedSpace::ReportCodeStatistics(); |
| 4570 | } |
| 4571 | |
| 4572 | |
| 4573 | // This function expects that NewSpace's allocated objects histogram is |
| 4574 | // populated (via a call to CollectStatistics or else as a side effect of a |
| 4575 | // just-completed scavenge collection). |
| 4576 | void Heap::ReportHeapStatistics(const char* title) { |
| 4577 | USE(title); |
| 4578 | PrintF(">>>>>> =============== %s (%d) =============== >>>>>>\n", |
| 4579 | title, gc_count_); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4580 | PrintF("old_gen_promotion_limit_ %" V8_PTR_PREFIX "d\n", |
| 4581 | old_gen_promotion_limit_); |
| 4582 | PrintF("old_gen_allocation_limit_ %" V8_PTR_PREFIX "d\n", |
| 4583 | old_gen_allocation_limit_); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4584 | PrintF("old_gen_limit_factor_ %d\n", old_gen_limit_factor_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4585 | |
| 4586 | PrintF("\n"); |
| 4587 | PrintF("Number of handles : %d\n", HandleScope::NumberOfHandles()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4588 | isolate_->global_handles()->PrintStats(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4589 | PrintF("\n"); |
| 4590 | |
| 4591 | PrintF("Heap statistics : "); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4592 | isolate_->memory_allocator()->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4593 | PrintF("To space : "); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4594 | new_space_.ReportStatistics(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4595 | PrintF("Old pointer space : "); |
| 4596 | old_pointer_space_->ReportStatistics(); |
| 4597 | PrintF("Old data space : "); |
| 4598 | old_data_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4599 | PrintF("Code space : "); |
| 4600 | code_space_->ReportStatistics(); |
| 4601 | PrintF("Map space : "); |
| 4602 | map_space_->ReportStatistics(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4603 | PrintF("Cell space : "); |
| 4604 | cell_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4605 | PrintF("Large object space : "); |
| 4606 | lo_space_->ReportStatistics(); |
| 4607 | PrintF(">>>>>> ========================================= >>>>>>\n"); |
| 4608 | } |
| 4609 | |
| 4610 | #endif // DEBUG |
| 4611 | |
| 4612 | bool Heap::Contains(HeapObject* value) { |
| 4613 | return Contains(value->address()); |
| 4614 | } |
| 4615 | |
| 4616 | |
| 4617 | bool Heap::Contains(Address addr) { |
| 4618 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 4619 | return HasBeenSetup() && |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4620 | (new_space_.ToSpaceContains(addr) || |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4621 | old_pointer_space_->Contains(addr) || |
| 4622 | old_data_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4623 | code_space_->Contains(addr) || |
| 4624 | map_space_->Contains(addr) || |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4625 | cell_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4626 | lo_space_->SlowContains(addr)); |
| 4627 | } |
| 4628 | |
| 4629 | |
| 4630 | bool Heap::InSpace(HeapObject* value, AllocationSpace space) { |
| 4631 | return InSpace(value->address(), space); |
| 4632 | } |
| 4633 | |
| 4634 | |
| 4635 | bool Heap::InSpace(Address addr, AllocationSpace space) { |
| 4636 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 4637 | if (!HasBeenSetup()) return false; |
| 4638 | |
| 4639 | switch (space) { |
| 4640 | case NEW_SPACE: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4641 | return new_space_.ToSpaceContains(addr); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4642 | case OLD_POINTER_SPACE: |
| 4643 | return old_pointer_space_->Contains(addr); |
| 4644 | case OLD_DATA_SPACE: |
| 4645 | return old_data_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4646 | case CODE_SPACE: |
| 4647 | return code_space_->Contains(addr); |
| 4648 | case MAP_SPACE: |
| 4649 | return map_space_->Contains(addr); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4650 | case CELL_SPACE: |
| 4651 | return cell_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4652 | case LO_SPACE: |
| 4653 | return lo_space_->SlowContains(addr); |
| 4654 | } |
| 4655 | |
| 4656 | return false; |
| 4657 | } |
| 4658 | |
| 4659 | |
| 4660 | #ifdef DEBUG |
| 4661 | void Heap::Verify() { |
| 4662 | ASSERT(HasBeenSetup()); |
| 4663 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4664 | store_buffer()->Verify(); |
| 4665 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4666 | VerifyPointersVisitor visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4667 | IterateRoots(&visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4668 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4669 | new_space_.Verify(); |
| 4670 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4671 | old_pointer_space_->Verify(&visitor); |
| 4672 | map_space_->Verify(&visitor); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4673 | |
| 4674 | VerifyPointersVisitor no_dirty_regions_visitor; |
| 4675 | old_data_space_->Verify(&no_dirty_regions_visitor); |
| 4676 | code_space_->Verify(&no_dirty_regions_visitor); |
| 4677 | cell_space_->Verify(&no_dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4678 | |
| 4679 | lo_space_->Verify(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4680 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4681 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4682 | #endif // DEBUG |
| 4683 | |
| 4684 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4685 | MaybeObject* Heap::LookupSymbol(Vector<const char> string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4686 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4687 | Object* new_table; |
| 4688 | { MaybeObject* maybe_new_table = |
| 4689 | symbol_table()->LookupSymbol(string, &symbol); |
| 4690 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4691 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4692 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4693 | // SymbolTable is a singleton and checks for identity. |
| 4694 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4695 | ASSERT(symbol != NULL); |
| 4696 | return symbol; |
| 4697 | } |
| 4698 | |
| 4699 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4700 | MaybeObject* Heap::LookupAsciiSymbol(Vector<const char> string) { |
| 4701 | Object* symbol = NULL; |
| 4702 | Object* new_table; |
| 4703 | { MaybeObject* maybe_new_table = |
| 4704 | symbol_table()->LookupAsciiSymbol(string, &symbol); |
| 4705 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4706 | } |
| 4707 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4708 | // SymbolTable is a singleton and checks for identity. |
| 4709 | roots_[kSymbolTableRootIndex] = new_table; |
| 4710 | ASSERT(symbol != NULL); |
| 4711 | return symbol; |
| 4712 | } |
| 4713 | |
| 4714 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 4715 | MaybeObject* Heap::LookupAsciiSymbol(Handle<SeqAsciiString> string, |
| 4716 | int from, |
| 4717 | int length) { |
| 4718 | Object* symbol = NULL; |
| 4719 | Object* new_table; |
| 4720 | { MaybeObject* maybe_new_table = |
| 4721 | symbol_table()->LookupSubStringAsciiSymbol(string, |
| 4722 | from, |
| 4723 | length, |
| 4724 | &symbol); |
| 4725 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4726 | } |
| 4727 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4728 | // SymbolTable is a singleton and checks for identity. |
| 4729 | roots_[kSymbolTableRootIndex] = new_table; |
| 4730 | ASSERT(symbol != NULL); |
| 4731 | return symbol; |
| 4732 | } |
| 4733 | |
| 4734 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4735 | MaybeObject* Heap::LookupTwoByteSymbol(Vector<const uc16> string) { |
| 4736 | Object* symbol = NULL; |
| 4737 | Object* new_table; |
| 4738 | { MaybeObject* maybe_new_table = |
| 4739 | symbol_table()->LookupTwoByteSymbol(string, &symbol); |
| 4740 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4741 | } |
| 4742 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4743 | // SymbolTable is a singleton and checks for identity. |
| 4744 | roots_[kSymbolTableRootIndex] = new_table; |
| 4745 | ASSERT(symbol != NULL); |
| 4746 | return symbol; |
| 4747 | } |
| 4748 | |
| 4749 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4750 | MaybeObject* Heap::LookupSymbol(String* string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4751 | if (string->IsSymbol()) return string; |
| 4752 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4753 | Object* new_table; |
| 4754 | { MaybeObject* maybe_new_table = |
| 4755 | symbol_table()->LookupString(string, &symbol); |
| 4756 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4757 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4758 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4759 | // SymbolTable is a singleton and checks for identity. |
| 4760 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4761 | ASSERT(symbol != NULL); |
| 4762 | return symbol; |
| 4763 | } |
| 4764 | |
| 4765 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4766 | bool Heap::LookupSymbolIfExists(String* string, String** symbol) { |
| 4767 | if (string->IsSymbol()) { |
| 4768 | *symbol = string; |
| 4769 | return true; |
| 4770 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4771 | return symbol_table()->LookupSymbolIfExists(string, symbol); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4772 | } |
| 4773 | |
| 4774 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4775 | #ifdef DEBUG |
| 4776 | void Heap::ZapFromSpace() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4777 | NewSpacePageIterator it(new_space_.FromSpaceStart(), |
| 4778 | new_space_.FromSpaceEnd()); |
| 4779 | while (it.has_next()) { |
| 4780 | NewSpacePage* page = it.next(); |
| 4781 | for (Address cursor = page->body(), limit = page->body_limit(); |
| 4782 | cursor < limit; |
| 4783 | cursor += kPointerSize) { |
| 4784 | Memory::Address_at(cursor) = kFromSpaceZapValue; |
| 4785 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4786 | } |
| 4787 | } |
| 4788 | #endif // DEBUG |
| 4789 | |
| 4790 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4791 | void Heap::IterateAndMarkPointersToFromSpace(Address start, |
| 4792 | Address end, |
| 4793 | ObjectSlotCallback callback) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4794 | Address slot_address = start; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4795 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4796 | // We are not collecting slots on new space objects during mutation |
| 4797 | // thus we have to scan for pointers to evacuation candidates when we |
| 4798 | // promote objects. But we should not record any slots in non-black |
| 4799 | // objects. Grey object's slots would be rescanned. |
| 4800 | // White object might not survive until the end of collection |
| 4801 | // it would be a violation of the invariant to record it's slots. |
| 4802 | bool record_slots = false; |
| 4803 | if (incremental_marking()->IsCompacting()) { |
| 4804 | MarkBit mark_bit = Marking::MarkBitFrom(HeapObject::FromAddress(start)); |
| 4805 | record_slots = Marking::IsBlack(mark_bit); |
| 4806 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4807 | |
| 4808 | while (slot_address < end) { |
| 4809 | Object** slot = reinterpret_cast<Object**>(slot_address); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4810 | Object* object = *slot; |
| 4811 | // If the store buffer becomes overfull we mark pages as being exempt from |
| 4812 | // the store buffer. These pages are scanned to find pointers that point |
| 4813 | // to the new space. In that case we may hit newly promoted objects and |
| 4814 | // fix the pointers before the promotion queue gets to them. Thus the 'if'. |
| 4815 | if (object->IsHeapObject()) { |
| 4816 | if (Heap::InFromSpace(object)) { |
| 4817 | callback(reinterpret_cast<HeapObject**>(slot), |
| 4818 | HeapObject::cast(object)); |
| 4819 | Object* new_object = *slot; |
| 4820 | if (InNewSpace(new_object)) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 4821 | SLOW_ASSERT(Heap::InToSpace(new_object)); |
| 4822 | SLOW_ASSERT(new_object->IsHeapObject()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4823 | store_buffer_.EnterDirectlyIntoStoreBuffer( |
| 4824 | reinterpret_cast<Address>(slot)); |
| 4825 | } |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 4826 | SLOW_ASSERT(!MarkCompactCollector::IsOnEvacuationCandidate(new_object)); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4827 | } else if (record_slots && |
| 4828 | MarkCompactCollector::IsOnEvacuationCandidate(object)) { |
| 4829 | mark_compact_collector()->RecordSlot(slot, slot, object); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4830 | } |
| 4831 | } |
| 4832 | slot_address += kPointerSize; |
| 4833 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4834 | } |
| 4835 | |
| 4836 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4837 | #ifdef DEBUG |
| 4838 | typedef bool (*CheckStoreBufferFilter)(Object** addr); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4839 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4840 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4841 | bool IsAMapPointerAddress(Object** addr) { |
| 4842 | uintptr_t a = reinterpret_cast<uintptr_t>(addr); |
| 4843 | int mod = a % Map::kSize; |
| 4844 | return mod >= Map::kPointerFieldsBeginOffset && |
| 4845 | mod < Map::kPointerFieldsEndOffset; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4846 | } |
| 4847 | |
| 4848 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4849 | bool EverythingsAPointer(Object** addr) { |
| 4850 | return true; |
| 4851 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4852 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 4853 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4854 | static void CheckStoreBuffer(Heap* heap, |
| 4855 | Object** current, |
| 4856 | Object** limit, |
| 4857 | Object**** store_buffer_position, |
| 4858 | Object*** store_buffer_top, |
| 4859 | CheckStoreBufferFilter filter, |
| 4860 | Address special_garbage_start, |
| 4861 | Address special_garbage_end) { |
| 4862 | Map* free_space_map = heap->free_space_map(); |
| 4863 | for ( ; current < limit; current++) { |
| 4864 | Object* o = *current; |
| 4865 | Address current_address = reinterpret_cast<Address>(current); |
| 4866 | // Skip free space. |
| 4867 | if (o == free_space_map) { |
| 4868 | Address current_address = reinterpret_cast<Address>(current); |
| 4869 | FreeSpace* free_space = |
| 4870 | FreeSpace::cast(HeapObject::FromAddress(current_address)); |
| 4871 | int skip = free_space->Size(); |
| 4872 | ASSERT(current_address + skip <= reinterpret_cast<Address>(limit)); |
| 4873 | ASSERT(skip > 0); |
| 4874 | current_address += skip - kPointerSize; |
| 4875 | current = reinterpret_cast<Object**>(current_address); |
| 4876 | continue; |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 4877 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4878 | // Skip the current linear allocation space between top and limit which is |
| 4879 | // unmarked with the free space map, but can contain junk. |
| 4880 | if (current_address == special_garbage_start && |
| 4881 | special_garbage_end != special_garbage_start) { |
| 4882 | current_address = special_garbage_end - kPointerSize; |
| 4883 | current = reinterpret_cast<Object**>(current_address); |
| 4884 | continue; |
| 4885 | } |
| 4886 | if (!(*filter)(current)) continue; |
| 4887 | ASSERT(current_address < special_garbage_start || |
| 4888 | current_address >= special_garbage_end); |
| 4889 | ASSERT(reinterpret_cast<uintptr_t>(o) != kFreeListZapValue); |
| 4890 | // We have to check that the pointer does not point into new space |
| 4891 | // without trying to cast it to a heap object since the hash field of |
| 4892 | // a string can contain values like 1 and 3 which are tagged null |
| 4893 | // pointers. |
| 4894 | if (!heap->InNewSpace(o)) continue; |
| 4895 | while (**store_buffer_position < current && |
| 4896 | *store_buffer_position < store_buffer_top) { |
| 4897 | (*store_buffer_position)++; |
| 4898 | } |
| 4899 | if (**store_buffer_position != current || |
| 4900 | *store_buffer_position == store_buffer_top) { |
| 4901 | Object** obj_start = current; |
| 4902 | while (!(*obj_start)->IsMap()) obj_start--; |
| 4903 | UNREACHABLE(); |
| 4904 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4905 | } |
| 4906 | } |
| 4907 | |
| 4908 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 4909 | // Check that the store buffer contains all intergenerational pointers by |
| 4910 | // scanning a page and ensuring that all pointers to young space are in the |
| 4911 | // store buffer. |
| 4912 | void Heap::OldPointerSpaceCheckStoreBuffer() { |
| 4913 | OldSpace* space = old_pointer_space(); |
| 4914 | PageIterator pages(space); |
| 4915 | |
| 4916 | store_buffer()->SortUniq(); |
| 4917 | |
| 4918 | while (pages.has_next()) { |
| 4919 | Page* page = pages.next(); |
| 4920 | Object** current = reinterpret_cast<Object**>(page->ObjectAreaStart()); |
| 4921 | |
| 4922 | Address end = page->ObjectAreaEnd(); |
| 4923 | |
| 4924 | Object*** store_buffer_position = store_buffer()->Start(); |
| 4925 | Object*** store_buffer_top = store_buffer()->Top(); |
| 4926 | |
| 4927 | Object** limit = reinterpret_cast<Object**>(end); |
| 4928 | CheckStoreBuffer(this, |
| 4929 | current, |
| 4930 | limit, |
| 4931 | &store_buffer_position, |
| 4932 | store_buffer_top, |
| 4933 | &EverythingsAPointer, |
| 4934 | space->top(), |
| 4935 | space->limit()); |
| 4936 | } |
| 4937 | } |
| 4938 | |
| 4939 | |
| 4940 | void Heap::MapSpaceCheckStoreBuffer() { |
| 4941 | MapSpace* space = map_space(); |
| 4942 | PageIterator pages(space); |
| 4943 | |
| 4944 | store_buffer()->SortUniq(); |
| 4945 | |
| 4946 | while (pages.has_next()) { |
| 4947 | Page* page = pages.next(); |
| 4948 | Object** current = reinterpret_cast<Object**>(page->ObjectAreaStart()); |
| 4949 | |
| 4950 | Address end = page->ObjectAreaEnd(); |
| 4951 | |
| 4952 | Object*** store_buffer_position = store_buffer()->Start(); |
| 4953 | Object*** store_buffer_top = store_buffer()->Top(); |
| 4954 | |
| 4955 | Object** limit = reinterpret_cast<Object**>(end); |
| 4956 | CheckStoreBuffer(this, |
| 4957 | current, |
| 4958 | limit, |
| 4959 | &store_buffer_position, |
| 4960 | store_buffer_top, |
| 4961 | &IsAMapPointerAddress, |
| 4962 | space->top(), |
| 4963 | space->limit()); |
| 4964 | } |
| 4965 | } |
| 4966 | |
| 4967 | |
| 4968 | void Heap::LargeObjectSpaceCheckStoreBuffer() { |
| 4969 | LargeObjectIterator it(lo_space()); |
| 4970 | for (HeapObject* object = it.Next(); object != NULL; object = it.Next()) { |
| 4971 | // We only have code, sequential strings, or fixed arrays in large |
| 4972 | // object space, and only fixed arrays can possibly contain pointers to |
| 4973 | // the young generation. |
| 4974 | if (object->IsFixedArray()) { |
| 4975 | Object*** store_buffer_position = store_buffer()->Start(); |
| 4976 | Object*** store_buffer_top = store_buffer()->Top(); |
| 4977 | Object** current = reinterpret_cast<Object**>(object->address()); |
| 4978 | Object** limit = |
| 4979 | reinterpret_cast<Object**>(object->address() + object->Size()); |
| 4980 | CheckStoreBuffer(this, |
| 4981 | current, |
| 4982 | limit, |
| 4983 | &store_buffer_position, |
| 4984 | store_buffer_top, |
| 4985 | &EverythingsAPointer, |
| 4986 | NULL, |
| 4987 | NULL); |
| 4988 | } |
| 4989 | } |
| 4990 | } |
| 4991 | #endif |
| 4992 | |
| 4993 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4994 | void Heap::IterateRoots(ObjectVisitor* v, VisitMode mode) { |
| 4995 | IterateStrongRoots(v, mode); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4996 | IterateWeakRoots(v, mode); |
| 4997 | } |
| 4998 | |
| 4999 | |
| 5000 | void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 5001 | v->VisitPointer(reinterpret_cast<Object**>(&roots_[kSymbolTableRootIndex])); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5002 | v->Synchronize("symbol_table"); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 5003 | if (mode != VISIT_ALL_IN_SCAVENGE && |
| 5004 | mode != VISIT_ALL_IN_SWEEP_NEWSPACE) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5005 | // Scavenge collections have special processing for this. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5006 | external_string_table_.Iterate(v); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5007 | } |
| 5008 | v->Synchronize("external_string_table"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5009 | } |
| 5010 | |
| 5011 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5012 | void Heap::IterateStrongRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 5013 | v->VisitPointers(&roots_[0], &roots_[kStrongRootListLength]); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5014 | v->Synchronize("strong_root_list"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5015 | |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 5016 | v->VisitPointer(BitCast<Object**>(&hidden_symbol_)); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5017 | v->Synchronize("symbol"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5018 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5019 | isolate_->bootstrapper()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5020 | v->Synchronize("bootstrapper"); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5021 | isolate_->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5022 | v->Synchronize("top"); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5023 | Relocatable::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5024 | v->Synchronize("relocatable"); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 5025 | |
| 5026 | #ifdef ENABLE_DEBUGGER_SUPPORT |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5027 | isolate_->debug()->Iterate(v); |
ricow@chromium.org | 4f693d6 | 2011-07-04 14:01:31 +0000 | [diff] [blame] | 5028 | if (isolate_->deoptimizer_data() != NULL) { |
| 5029 | isolate_->deoptimizer_data()->Iterate(v); |
| 5030 | } |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 5031 | #endif |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5032 | v->Synchronize("debug"); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5033 | isolate_->compilation_cache()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5034 | v->Synchronize("compilationcache"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5035 | |
| 5036 | // Iterate over local handles in handle scopes. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5037 | isolate_->handle_scope_implementer()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5038 | v->Synchronize("handlescope"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5039 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5040 | // Iterate over the builtin code objects and code stubs in the |
| 5041 | // heap. Note that it is not necessary to iterate over code objects |
| 5042 | // on scavenge collections. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5043 | if (mode != VISIT_ALL_IN_SCAVENGE) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5044 | isolate_->builtins()->IterateBuiltins(v); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5045 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5046 | v->Synchronize("builtins"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5047 | |
| 5048 | // Iterate over global handles. |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 5049 | switch (mode) { |
| 5050 | case VISIT_ONLY_STRONG: |
| 5051 | isolate_->global_handles()->IterateStrongRoots(v); |
| 5052 | break; |
| 5053 | case VISIT_ALL_IN_SCAVENGE: |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 5054 | isolate_->global_handles()->IterateNewSpaceStrongAndDependentRoots(v); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 5055 | break; |
| 5056 | case VISIT_ALL_IN_SWEEP_NEWSPACE: |
| 5057 | case VISIT_ALL: |
| 5058 | isolate_->global_handles()->IterateAllRoots(v); |
| 5059 | break; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5060 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5061 | v->Synchronize("globalhandles"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5062 | |
| 5063 | // Iterate over pointers being held by inactive threads. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5064 | isolate_->thread_manager()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5065 | v->Synchronize("threadmanager"); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5066 | |
| 5067 | // Iterate over the pointers the Serialization/Deserialization code is |
| 5068 | // holding. |
| 5069 | // During garbage collection this keeps the partial snapshot cache alive. |
| 5070 | // During deserialization of the startup snapshot this creates the partial |
| 5071 | // snapshot cache and deserializes the objects it refers to. During |
| 5072 | // serialization this does nothing, since the partial snapshot cache is |
| 5073 | // empty. However the next thing we do is create the partial snapshot, |
| 5074 | // filling up the partial snapshot cache with objects it needs as we go. |
| 5075 | SerializerDeserializer::Iterate(v); |
| 5076 | // We don't do a v->Synchronize call here, because in debug mode that will |
| 5077 | // output a flag to the snapshot. However at this point the serializer and |
| 5078 | // deserializer are deliberately a little unsynchronized (see above) so the |
| 5079 | // checking of the sync flag in the snapshot would fail. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5080 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5081 | |
| 5082 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5083 | // TODO(1236194): Since the heap size is configurable on the command line |
| 5084 | // and through the API, we should gracefully handle the case that the heap |
| 5085 | // size is not big enough to fit all the initial objects. |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 5086 | bool Heap::ConfigureHeap(int max_semispace_size, |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5087 | intptr_t max_old_gen_size, |
| 5088 | intptr_t max_executable_size) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5089 | if (HasBeenSetup()) return false; |
| 5090 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5091 | if (max_semispace_size > 0) { |
| 5092 | if (max_semispace_size < Page::kPageSize) { |
| 5093 | max_semispace_size = Page::kPageSize; |
| 5094 | if (FLAG_trace_gc) { |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 5095 | PrintF("Max semispace size cannot be less than %dkbytes\n", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5096 | Page::kPageSize >> 10); |
| 5097 | } |
| 5098 | } |
| 5099 | max_semispace_size_ = max_semispace_size; |
| 5100 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5101 | |
| 5102 | if (Snapshot::IsEnabled()) { |
| 5103 | // If we are using a snapshot we always reserve the default amount |
| 5104 | // of memory for each semispace because code in the snapshot has |
| 5105 | // write-barrier code that relies on the size and alignment of new |
| 5106 | // space. We therefore cannot use a larger max semispace size |
| 5107 | // than the default reserved semispace size. |
| 5108 | if (max_semispace_size_ > reserved_semispace_size_) { |
| 5109 | max_semispace_size_ = reserved_semispace_size_; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5110 | if (FLAG_trace_gc) { |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 5111 | PrintF("Max semispace size cannot be more than %dkbytes\n", |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5112 | reserved_semispace_size_ >> 10); |
| 5113 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5114 | } |
| 5115 | } else { |
| 5116 | // If we are not using snapshots we reserve space for the actual |
| 5117 | // max semispace size. |
| 5118 | reserved_semispace_size_ = max_semispace_size_; |
| 5119 | } |
| 5120 | |
| 5121 | 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] | 5122 | if (max_executable_size > 0) { |
| 5123 | max_executable_size_ = RoundUp(max_executable_size, Page::kPageSize); |
| 5124 | } |
| 5125 | |
| 5126 | // The max executable size must be less than or equal to the max old |
| 5127 | // generation size. |
| 5128 | if (max_executable_size_ > max_old_generation_size_) { |
| 5129 | max_executable_size_ = max_old_generation_size_; |
| 5130 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5131 | |
| 5132 | // The new space size must be a power of two to support single-bit testing |
| 5133 | // for containment. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5134 | max_semispace_size_ = RoundUpToPowerOf2(max_semispace_size_); |
| 5135 | reserved_semispace_size_ = RoundUpToPowerOf2(reserved_semispace_size_); |
| 5136 | initial_semispace_size_ = Min(initial_semispace_size_, max_semispace_size_); |
| 5137 | external_allocation_limit_ = 10 * max_semispace_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5138 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5139 | // The old generation is paged and needs at least one page for each space. |
| 5140 | int paged_space_count = LAST_PAGED_SPACE - FIRST_PAGED_SPACE + 1; |
| 5141 | max_old_generation_size_ = Max(static_cast<intptr_t>(paged_space_count * |
| 5142 | Page::kPageSize), |
| 5143 | RoundUp(max_old_generation_size_, |
| 5144 | Page::kPageSize)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5145 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5146 | configured_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5147 | return true; |
| 5148 | } |
| 5149 | |
| 5150 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5151 | bool Heap::ConfigureHeapDefault() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5152 | return ConfigureHeap(static_cast<intptr_t>(FLAG_max_new_space_size / 2) * KB, |
| 5153 | static_cast<intptr_t>(FLAG_max_old_space_size) * MB, |
| 5154 | static_cast<intptr_t>(FLAG_max_executable_size) * MB); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5155 | } |
| 5156 | |
| 5157 | |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5158 | void Heap::RecordStats(HeapStats* stats, bool take_snapshot) { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 5159 | *stats->start_marker = HeapStats::kStartMarker; |
| 5160 | *stats->end_marker = HeapStats::kEndMarker; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5161 | *stats->new_space_size = new_space_.SizeAsInt(); |
| 5162 | *stats->new_space_capacity = static_cast<int>(new_space_.Capacity()); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 5163 | *stats->old_pointer_space_size = old_pointer_space_->Size(); |
| 5164 | *stats->old_pointer_space_capacity = old_pointer_space_->Capacity(); |
| 5165 | *stats->old_data_space_size = old_data_space_->Size(); |
| 5166 | *stats->old_data_space_capacity = old_data_space_->Capacity(); |
| 5167 | *stats->code_space_size = code_space_->Size(); |
| 5168 | *stats->code_space_capacity = code_space_->Capacity(); |
| 5169 | *stats->map_space_size = map_space_->Size(); |
| 5170 | *stats->map_space_capacity = map_space_->Capacity(); |
| 5171 | *stats->cell_space_size = cell_space_->Size(); |
| 5172 | *stats->cell_space_capacity = cell_space_->Capacity(); |
| 5173 | *stats->lo_space_size = lo_space_->Size(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5174 | isolate_->global_handles()->RecordStats(stats); |
| 5175 | *stats->memory_allocator_size = isolate()->memory_allocator()->Size(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5176 | *stats->memory_allocator_capacity = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5177 | isolate()->memory_allocator()->Size() + |
| 5178 | isolate()->memory_allocator()->Available(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5179 | *stats->os_error = OS::GetLastError(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5180 | isolate()->memory_allocator()->Available(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5181 | if (take_snapshot) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5182 | HeapIterator iterator; |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5183 | for (HeapObject* obj = iterator.next(); |
| 5184 | obj != NULL; |
| 5185 | obj = iterator.next()) { |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 5186 | InstanceType type = obj->map()->instance_type(); |
| 5187 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 5188 | stats->objects_per_type[type]++; |
| 5189 | stats->size_per_type[type] += obj->Size(); |
| 5190 | } |
| 5191 | } |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 5192 | } |
| 5193 | |
| 5194 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5195 | intptr_t Heap::PromotedSpaceSize() { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5196 | return old_pointer_space_->Size() |
| 5197 | + old_data_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5198 | + code_space_->Size() |
| 5199 | + map_space_->Size() |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5200 | + cell_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5201 | + lo_space_->Size(); |
| 5202 | } |
| 5203 | |
| 5204 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5205 | int Heap::PromotedExternalMemorySize() { |
| 5206 | if (amount_of_external_allocated_memory_ |
| 5207 | <= amount_of_external_allocated_memory_at_last_global_gc_) return 0; |
| 5208 | return amount_of_external_allocated_memory_ |
| 5209 | - amount_of_external_allocated_memory_at_last_global_gc_; |
| 5210 | } |
| 5211 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5212 | #ifdef DEBUG |
| 5213 | |
| 5214 | // Tags 0, 1, and 3 are used. Use 2 for marking visited HeapObject. |
| 5215 | static const int kMarkTag = 2; |
| 5216 | |
| 5217 | |
| 5218 | class HeapDebugUtils { |
| 5219 | public: |
| 5220 | explicit HeapDebugUtils(Heap* heap) |
| 5221 | : search_for_any_global_(false), |
| 5222 | search_target_(NULL), |
| 5223 | found_target_(false), |
| 5224 | object_stack_(20), |
| 5225 | heap_(heap) { |
| 5226 | } |
| 5227 | |
| 5228 | class MarkObjectVisitor : public ObjectVisitor { |
| 5229 | public: |
| 5230 | explicit MarkObjectVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5231 | |
| 5232 | void VisitPointers(Object** start, Object** end) { |
| 5233 | // Copy all HeapObject pointers in [start, end) |
| 5234 | for (Object** p = start; p < end; p++) { |
| 5235 | if ((*p)->IsHeapObject()) |
| 5236 | utils_->MarkObjectRecursively(p); |
| 5237 | } |
| 5238 | } |
| 5239 | |
| 5240 | HeapDebugUtils* utils_; |
| 5241 | }; |
| 5242 | |
| 5243 | void MarkObjectRecursively(Object** p) { |
| 5244 | if (!(*p)->IsHeapObject()) return; |
| 5245 | |
| 5246 | HeapObject* obj = HeapObject::cast(*p); |
| 5247 | |
| 5248 | Object* map = obj->map(); |
| 5249 | |
| 5250 | if (!map->IsHeapObject()) return; // visited before |
| 5251 | |
| 5252 | if (found_target_) return; // stop if target found |
| 5253 | object_stack_.Add(obj); |
| 5254 | if ((search_for_any_global_ && obj->IsJSGlobalObject()) || |
| 5255 | (!search_for_any_global_ && (obj == search_target_))) { |
| 5256 | found_target_ = true; |
| 5257 | return; |
| 5258 | } |
| 5259 | |
| 5260 | // not visited yet |
| 5261 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 5262 | |
| 5263 | Address map_addr = map_p->address(); |
| 5264 | |
| 5265 | obj->set_map(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
| 5266 | |
| 5267 | MarkObjectRecursively(&map); |
| 5268 | |
| 5269 | MarkObjectVisitor mark_visitor(this); |
| 5270 | |
| 5271 | obj->IterateBody(map_p->instance_type(), obj->SizeFromMap(map_p), |
| 5272 | &mark_visitor); |
| 5273 | |
| 5274 | if (!found_target_) // don't pop if found the target |
| 5275 | object_stack_.RemoveLast(); |
| 5276 | } |
| 5277 | |
| 5278 | |
| 5279 | class UnmarkObjectVisitor : public ObjectVisitor { |
| 5280 | public: |
| 5281 | explicit UnmarkObjectVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5282 | |
| 5283 | void VisitPointers(Object** start, Object** end) { |
| 5284 | // Copy all HeapObject pointers in [start, end) |
| 5285 | for (Object** p = start; p < end; p++) { |
| 5286 | if ((*p)->IsHeapObject()) |
| 5287 | utils_->UnmarkObjectRecursively(p); |
| 5288 | } |
| 5289 | } |
| 5290 | |
| 5291 | HeapDebugUtils* utils_; |
| 5292 | }; |
| 5293 | |
| 5294 | |
| 5295 | void UnmarkObjectRecursively(Object** p) { |
| 5296 | if (!(*p)->IsHeapObject()) return; |
| 5297 | |
| 5298 | HeapObject* obj = HeapObject::cast(*p); |
| 5299 | |
| 5300 | Object* map = obj->map(); |
| 5301 | |
| 5302 | if (map->IsHeapObject()) return; // unmarked already |
| 5303 | |
| 5304 | Address map_addr = reinterpret_cast<Address>(map); |
| 5305 | |
| 5306 | map_addr -= kMarkTag; |
| 5307 | |
| 5308 | ASSERT_TAG_ALIGNED(map_addr); |
| 5309 | |
| 5310 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 5311 | |
| 5312 | obj->set_map(reinterpret_cast<Map*>(map_p)); |
| 5313 | |
| 5314 | UnmarkObjectRecursively(reinterpret_cast<Object**>(&map_p)); |
| 5315 | |
| 5316 | UnmarkObjectVisitor unmark_visitor(this); |
| 5317 | |
| 5318 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 5319 | obj->SizeFromMap(Map::cast(map_p)), |
| 5320 | &unmark_visitor); |
| 5321 | } |
| 5322 | |
| 5323 | |
| 5324 | void MarkRootObjectRecursively(Object** root) { |
| 5325 | if (search_for_any_global_) { |
| 5326 | ASSERT(search_target_ == NULL); |
| 5327 | } else { |
| 5328 | ASSERT(search_target_->IsHeapObject()); |
| 5329 | } |
| 5330 | found_target_ = false; |
| 5331 | object_stack_.Clear(); |
| 5332 | |
| 5333 | MarkObjectRecursively(root); |
| 5334 | UnmarkObjectRecursively(root); |
| 5335 | |
| 5336 | if (found_target_) { |
| 5337 | PrintF("=====================================\n"); |
| 5338 | PrintF("==== Path to object ====\n"); |
| 5339 | PrintF("=====================================\n\n"); |
| 5340 | |
| 5341 | ASSERT(!object_stack_.is_empty()); |
| 5342 | for (int i = 0; i < object_stack_.length(); i++) { |
| 5343 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
| 5344 | Object* obj = object_stack_[i]; |
| 5345 | obj->Print(); |
| 5346 | } |
| 5347 | PrintF("=====================================\n"); |
| 5348 | } |
| 5349 | } |
| 5350 | |
| 5351 | // Helper class for visiting HeapObjects recursively. |
| 5352 | class MarkRootVisitor: public ObjectVisitor { |
| 5353 | public: |
| 5354 | explicit MarkRootVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5355 | |
| 5356 | void VisitPointers(Object** start, Object** end) { |
| 5357 | // Visit all HeapObject pointers in [start, end) |
| 5358 | for (Object** p = start; p < end; p++) { |
| 5359 | if ((*p)->IsHeapObject()) |
| 5360 | utils_->MarkRootObjectRecursively(p); |
| 5361 | } |
| 5362 | } |
| 5363 | |
| 5364 | HeapDebugUtils* utils_; |
| 5365 | }; |
| 5366 | |
| 5367 | bool search_for_any_global_; |
| 5368 | Object* search_target_; |
| 5369 | bool found_target_; |
| 5370 | List<Object*> object_stack_; |
| 5371 | Heap* heap_; |
| 5372 | |
| 5373 | friend class Heap; |
| 5374 | }; |
| 5375 | |
| 5376 | #endif |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5377 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5378 | bool Heap::Setup(bool create_heap_objects) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5379 | #ifdef DEBUG |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5380 | allocation_timeout_ = FLAG_gc_interval; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5381 | debug_utils_ = new HeapDebugUtils(this); |
| 5382 | #endif |
| 5383 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5384 | // Initialize heap spaces and initial maps and objects. Whenever something |
| 5385 | // goes wrong, just return false. The caller should check the results and |
| 5386 | // call Heap::TearDown() to release allocated memory. |
| 5387 | // |
| 5388 | // If the heap is not yet configured (eg, through the API), configure it. |
| 5389 | // Configuration is based on the flags new-space-size (really the semispace |
| 5390 | // size) and old-space-size if set or the initial values of semispace_size_ |
| 5391 | // and old_generation_size_ otherwise. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5392 | if (!configured_) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5393 | if (!ConfigureHeapDefault()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5394 | } |
| 5395 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5396 | gc_initializer_mutex->Lock(); |
| 5397 | static bool initialized_gc = false; |
| 5398 | if (!initialized_gc) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5399 | initialized_gc = true; |
| 5400 | InitializeScavengingVisitorsTables(); |
| 5401 | NewSpaceScavenger::Initialize(); |
| 5402 | MarkCompactCollector::Initialize(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5403 | } |
| 5404 | gc_initializer_mutex->Unlock(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5405 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 5406 | MarkMapPointersAsEncoded(false); |
| 5407 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5408 | // Setup memory allocator. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5409 | if (!isolate_->memory_allocator()->Setup(MaxReserved(), MaxExecutableSize())) |
| 5410 | return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5411 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5412 | // Setup new space. |
| 5413 | if (!new_space_.Setup(reserved_semispace_size_, max_semispace_size_)) { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5414 | return false; |
| 5415 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5416 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5417 | // Initialize old pointer space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5418 | old_pointer_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5419 | new OldSpace(this, |
| 5420 | max_old_generation_size_, |
| 5421 | OLD_POINTER_SPACE, |
| 5422 | NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5423 | if (old_pointer_space_ == NULL) return false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5424 | if (!old_pointer_space_->Setup()) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5425 | |
| 5426 | // Initialize old data space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5427 | old_data_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5428 | new OldSpace(this, |
| 5429 | max_old_generation_size_, |
| 5430 | OLD_DATA_SPACE, |
| 5431 | NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5432 | if (old_data_space_ == NULL) return false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5433 | if (!old_data_space_->Setup()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5434 | |
| 5435 | // Initialize the code space, set its maximum capacity to the old |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5436 | // generation size. It needs executable memory. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5437 | // On 64-bit platform(s), we put all code objects in a 2 GB range of |
| 5438 | // virtual address space, so that they can call each other with near calls. |
| 5439 | if (code_range_size_ > 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5440 | if (!isolate_->code_range()->Setup(code_range_size_)) { |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5441 | return false; |
| 5442 | } |
| 5443 | } |
| 5444 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5445 | code_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5446 | new OldSpace(this, max_old_generation_size_, CODE_SPACE, EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5447 | if (code_space_ == NULL) return false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5448 | if (!code_space_->Setup()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5449 | |
| 5450 | // Initialize map space. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5451 | map_space_ = new MapSpace(this, |
| 5452 | max_old_generation_size_, |
| 5453 | FLAG_max_map_space_pages, |
| 5454 | MAP_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5455 | if (map_space_ == NULL) return false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5456 | if (!map_space_->Setup()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5457 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5458 | // Initialize global property cell space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5459 | cell_space_ = new CellSpace(this, max_old_generation_size_, CELL_SPACE); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5460 | if (cell_space_ == NULL) return false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5461 | if (!cell_space_->Setup()) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5462 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5463 | // The large object code space may contain code or data. We set the memory |
| 5464 | // to be non-executable here for safety, but this means we need to enable it |
| 5465 | // explicitly when allocating large code objects. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5466 | lo_space_ = new LargeObjectSpace(this, max_old_generation_size_, LO_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5467 | if (lo_space_ == NULL) return false; |
| 5468 | if (!lo_space_->Setup()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5469 | if (create_heap_objects) { |
| 5470 | // Create initial maps. |
| 5471 | if (!CreateInitialMaps()) return false; |
| 5472 | if (!CreateApiObjects()) return false; |
| 5473 | |
| 5474 | // Create initial objects |
| 5475 | if (!CreateInitialObjects()) return false; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 5476 | |
| 5477 | global_contexts_list_ = undefined_value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5478 | } |
| 5479 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5480 | LOG(isolate_, IntPtrTEvent("heap-capacity", Capacity())); |
| 5481 | LOG(isolate_, IntPtrTEvent("heap-available", Available())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5482 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5483 | store_buffer()->Setup(); |
| 5484 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5485 | return true; |
| 5486 | } |
| 5487 | |
| 5488 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5489 | void Heap::SetStackLimits() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5490 | ASSERT(isolate_ != NULL); |
| 5491 | ASSERT(isolate_ == isolate()); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5492 | // On 64 bit machines, pointers are generally out of range of Smis. We write |
| 5493 | // something that looks like an out of range Smi to the GC. |
| 5494 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5495 | // Set up the special root array entries containing the stack limits. |
| 5496 | // 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] | 5497 | roots_[kStackLimitRootIndex] = |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5498 | reinterpret_cast<Object*>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5499 | (isolate_->stack_guard()->jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5500 | roots_[kRealStackLimitRootIndex] = |
| 5501 | reinterpret_cast<Object*>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5502 | (isolate_->stack_guard()->real_jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5503 | } |
| 5504 | |
| 5505 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5506 | void Heap::TearDown() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5507 | if (FLAG_print_cumulative_gc_stat) { |
| 5508 | PrintF("\n\n"); |
| 5509 | PrintF("gc_count=%d ", gc_count_); |
| 5510 | PrintF("mark_sweep_count=%d ", ms_count_); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5511 | PrintF("max_gc_pause=%d ", get_max_gc_pause()); |
| 5512 | PrintF("min_in_mutator=%d ", get_min_in_mutator()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5513 | PrintF("max_alive_after_gc=%" V8_PTR_PREFIX "d ", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5514 | get_max_alive_after_gc()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5515 | PrintF("\n\n"); |
| 5516 | } |
| 5517 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5518 | isolate_->global_handles()->TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5519 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5520 | external_string_table_.TearDown(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5521 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 5522 | new_space_.TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5523 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5524 | if (old_pointer_space_ != NULL) { |
| 5525 | old_pointer_space_->TearDown(); |
| 5526 | delete old_pointer_space_; |
| 5527 | old_pointer_space_ = NULL; |
| 5528 | } |
| 5529 | |
| 5530 | if (old_data_space_ != NULL) { |
| 5531 | old_data_space_->TearDown(); |
| 5532 | delete old_data_space_; |
| 5533 | old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5534 | } |
| 5535 | |
| 5536 | if (code_space_ != NULL) { |
| 5537 | code_space_->TearDown(); |
| 5538 | delete code_space_; |
| 5539 | code_space_ = NULL; |
| 5540 | } |
| 5541 | |
| 5542 | if (map_space_ != NULL) { |
| 5543 | map_space_->TearDown(); |
| 5544 | delete map_space_; |
| 5545 | map_space_ = NULL; |
| 5546 | } |
| 5547 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5548 | if (cell_space_ != NULL) { |
| 5549 | cell_space_->TearDown(); |
| 5550 | delete cell_space_; |
| 5551 | cell_space_ = NULL; |
| 5552 | } |
| 5553 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5554 | if (lo_space_ != NULL) { |
| 5555 | lo_space_->TearDown(); |
| 5556 | delete lo_space_; |
| 5557 | lo_space_ = NULL; |
| 5558 | } |
| 5559 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5560 | store_buffer()->TearDown(); |
| 5561 | incremental_marking()->TearDown(); |
| 5562 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5563 | isolate_->memory_allocator()->TearDown(); |
| 5564 | |
| 5565 | #ifdef DEBUG |
| 5566 | delete debug_utils_; |
| 5567 | debug_utils_ = NULL; |
| 5568 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5569 | } |
| 5570 | |
| 5571 | |
| 5572 | void Heap::Shrink() { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5573 | // Try to shrink all paged spaces. |
| 5574 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5575 | for (PagedSpace* space = spaces.next(); space != NULL; space = spaces.next()) |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5576 | space->ReleaseAllUnusedPages(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5577 | } |
| 5578 | |
| 5579 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 5580 | void Heap::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) { |
| 5581 | ASSERT(callback != NULL); |
| 5582 | GCPrologueCallbackPair pair(callback, gc_type); |
| 5583 | ASSERT(!gc_prologue_callbacks_.Contains(pair)); |
| 5584 | return gc_prologue_callbacks_.Add(pair); |
| 5585 | } |
| 5586 | |
| 5587 | |
| 5588 | void Heap::RemoveGCPrologueCallback(GCPrologueCallback callback) { |
| 5589 | ASSERT(callback != NULL); |
| 5590 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 5591 | if (gc_prologue_callbacks_[i].callback == callback) { |
| 5592 | gc_prologue_callbacks_.Remove(i); |
| 5593 | return; |
| 5594 | } |
| 5595 | } |
| 5596 | UNREACHABLE(); |
| 5597 | } |
| 5598 | |
| 5599 | |
| 5600 | void Heap::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) { |
| 5601 | ASSERT(callback != NULL); |
| 5602 | GCEpilogueCallbackPair pair(callback, gc_type); |
| 5603 | ASSERT(!gc_epilogue_callbacks_.Contains(pair)); |
| 5604 | return gc_epilogue_callbacks_.Add(pair); |
| 5605 | } |
| 5606 | |
| 5607 | |
| 5608 | void Heap::RemoveGCEpilogueCallback(GCEpilogueCallback callback) { |
| 5609 | ASSERT(callback != NULL); |
| 5610 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 5611 | if (gc_epilogue_callbacks_[i].callback == callback) { |
| 5612 | gc_epilogue_callbacks_.Remove(i); |
| 5613 | return; |
| 5614 | } |
| 5615 | } |
| 5616 | UNREACHABLE(); |
| 5617 | } |
| 5618 | |
| 5619 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5620 | #ifdef DEBUG |
| 5621 | |
| 5622 | class PrintHandleVisitor: public ObjectVisitor { |
| 5623 | public: |
| 5624 | void VisitPointers(Object** start, Object** end) { |
| 5625 | for (Object** p = start; p < end; p++) |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5626 | PrintF(" handle %p to %p\n", |
| 5627 | reinterpret_cast<void*>(p), |
| 5628 | reinterpret_cast<void*>(*p)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5629 | } |
| 5630 | }; |
| 5631 | |
| 5632 | void Heap::PrintHandles() { |
| 5633 | PrintF("Handles:\n"); |
| 5634 | PrintHandleVisitor v; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5635 | isolate_->handle_scope_implementer()->Iterate(&v); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5636 | } |
| 5637 | |
| 5638 | #endif |
| 5639 | |
| 5640 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5641 | Space* AllSpaces::next() { |
| 5642 | switch (counter_++) { |
| 5643 | case NEW_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5644 | return HEAP->new_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5645 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5646 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5647 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5648 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5649 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5650 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5651 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5652 | return HEAP->map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5653 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5654 | return HEAP->cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5655 | case LO_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5656 | return HEAP->lo_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5657 | default: |
| 5658 | return NULL; |
| 5659 | } |
| 5660 | } |
| 5661 | |
| 5662 | |
| 5663 | PagedSpace* PagedSpaces::next() { |
| 5664 | switch (counter_++) { |
| 5665 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5666 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5667 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5668 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5669 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5670 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5671 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5672 | return HEAP->map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5673 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5674 | return HEAP->cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5675 | default: |
| 5676 | return NULL; |
| 5677 | } |
| 5678 | } |
| 5679 | |
| 5680 | |
| 5681 | |
| 5682 | OldSpace* OldSpaces::next() { |
| 5683 | switch (counter_++) { |
| 5684 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5685 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5686 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5687 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5688 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5689 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5690 | default: |
| 5691 | return NULL; |
| 5692 | } |
| 5693 | } |
| 5694 | |
| 5695 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5696 | SpaceIterator::SpaceIterator() |
| 5697 | : current_space_(FIRST_SPACE), |
| 5698 | iterator_(NULL), |
| 5699 | size_func_(NULL) { |
| 5700 | } |
| 5701 | |
| 5702 | |
| 5703 | SpaceIterator::SpaceIterator(HeapObjectCallback size_func) |
| 5704 | : current_space_(FIRST_SPACE), |
| 5705 | iterator_(NULL), |
| 5706 | size_func_(size_func) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5707 | } |
| 5708 | |
| 5709 | |
| 5710 | SpaceIterator::~SpaceIterator() { |
| 5711 | // Delete active iterator if any. |
| 5712 | delete iterator_; |
| 5713 | } |
| 5714 | |
| 5715 | |
| 5716 | bool SpaceIterator::has_next() { |
| 5717 | // Iterate until no more spaces. |
| 5718 | return current_space_ != LAST_SPACE; |
| 5719 | } |
| 5720 | |
| 5721 | |
| 5722 | ObjectIterator* SpaceIterator::next() { |
| 5723 | if (iterator_ != NULL) { |
| 5724 | delete iterator_; |
| 5725 | iterator_ = NULL; |
| 5726 | // Move to the next space |
| 5727 | current_space_++; |
| 5728 | if (current_space_ > LAST_SPACE) { |
| 5729 | return NULL; |
| 5730 | } |
| 5731 | } |
| 5732 | |
| 5733 | // Return iterator for the new current space. |
| 5734 | return CreateIterator(); |
| 5735 | } |
| 5736 | |
| 5737 | |
| 5738 | // Create an iterator for the space to iterate. |
| 5739 | ObjectIterator* SpaceIterator::CreateIterator() { |
| 5740 | ASSERT(iterator_ == NULL); |
| 5741 | |
| 5742 | switch (current_space_) { |
| 5743 | case NEW_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5744 | iterator_ = new SemiSpaceIterator(HEAP->new_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5745 | break; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5746 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5747 | iterator_ = new HeapObjectIterator(HEAP->old_pointer_space(), size_func_); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5748 | break; |
| 5749 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5750 | iterator_ = new HeapObjectIterator(HEAP->old_data_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5751 | break; |
| 5752 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5753 | iterator_ = new HeapObjectIterator(HEAP->code_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5754 | break; |
| 5755 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5756 | iterator_ = new HeapObjectIterator(HEAP->map_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5757 | break; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5758 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5759 | iterator_ = new HeapObjectIterator(HEAP->cell_space(), size_func_); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5760 | break; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5761 | case LO_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5762 | iterator_ = new LargeObjectIterator(HEAP->lo_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5763 | break; |
| 5764 | } |
| 5765 | |
| 5766 | // Return the newly allocated iterator; |
| 5767 | ASSERT(iterator_ != NULL); |
| 5768 | return iterator_; |
| 5769 | } |
| 5770 | |
| 5771 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5772 | class HeapObjectsFilter { |
| 5773 | public: |
| 5774 | virtual ~HeapObjectsFilter() {} |
| 5775 | virtual bool SkipObject(HeapObject* object) = 0; |
| 5776 | }; |
| 5777 | |
| 5778 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5779 | class UnreachableObjectsFilter : public HeapObjectsFilter { |
| 5780 | public: |
| 5781 | UnreachableObjectsFilter() { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5782 | MarkReachableObjects(); |
| 5783 | } |
| 5784 | |
| 5785 | ~UnreachableObjectsFilter() { |
| 5786 | Isolate::Current()->heap()->mark_compact_collector()->ClearMarkbits(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5787 | } |
| 5788 | |
| 5789 | bool SkipObject(HeapObject* object) { |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5790 | MarkBit mark_bit = Marking::MarkBitFrom(object); |
| 5791 | return !mark_bit.Get(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5792 | } |
| 5793 | |
| 5794 | private: |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5795 | class MarkingVisitor : public ObjectVisitor { |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5796 | public: |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5797 | MarkingVisitor() : marking_stack_(10) {} |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5798 | |
| 5799 | void VisitPointers(Object** start, Object** end) { |
| 5800 | for (Object** p = start; p < end; p++) { |
| 5801 | if (!(*p)->IsHeapObject()) continue; |
| 5802 | HeapObject* obj = HeapObject::cast(*p); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5803 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 5804 | if (!mark_bit.Get()) { |
| 5805 | mark_bit.Set(); |
| 5806 | marking_stack_.Add(obj); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5807 | } |
| 5808 | } |
| 5809 | } |
| 5810 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5811 | void TransitiveClosure() { |
| 5812 | while (!marking_stack_.is_empty()) { |
| 5813 | HeapObject* obj = marking_stack_.RemoveLast(); |
| 5814 | obj->Iterate(this); |
| 5815 | } |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5816 | } |
| 5817 | |
| 5818 | private: |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5819 | List<HeapObject*> marking_stack_; |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5820 | }; |
| 5821 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5822 | void MarkReachableObjects() { |
| 5823 | Heap* heap = Isolate::Current()->heap(); |
| 5824 | MarkingVisitor visitor; |
| 5825 | heap->IterateRoots(&visitor, VISIT_ALL); |
| 5826 | visitor.TransitiveClosure(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5827 | } |
| 5828 | |
| 5829 | AssertNoAllocation no_alloc; |
| 5830 | }; |
| 5831 | |
| 5832 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5833 | HeapIterator::HeapIterator() |
| 5834 | : filtering_(HeapIterator::kNoFiltering), |
| 5835 | filter_(NULL) { |
| 5836 | Init(); |
| 5837 | } |
| 5838 | |
| 5839 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5840 | HeapIterator::HeapIterator(HeapIterator::HeapObjectsFiltering filtering) |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5841 | : filtering_(filtering), |
| 5842 | filter_(NULL) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5843 | Init(); |
| 5844 | } |
| 5845 | |
| 5846 | |
| 5847 | HeapIterator::~HeapIterator() { |
| 5848 | Shutdown(); |
| 5849 | } |
| 5850 | |
| 5851 | |
| 5852 | void HeapIterator::Init() { |
| 5853 | // Start the iteration. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 5854 | space_iterator_ = new SpaceIterator; |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5855 | switch (filtering_) { |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5856 | case kFilterUnreachable: |
| 5857 | filter_ = new UnreachableObjectsFilter; |
| 5858 | break; |
| 5859 | default: |
| 5860 | break; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5861 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5862 | object_iterator_ = space_iterator_->next(); |
| 5863 | } |
| 5864 | |
| 5865 | |
| 5866 | void HeapIterator::Shutdown() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5867 | #ifdef DEBUG |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5868 | // Assert that in filtering mode we have iterated through all |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5869 | // objects. Otherwise, heap will be left in an inconsistent state. |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5870 | if (filtering_ != kNoFiltering) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5871 | ASSERT(object_iterator_ == NULL); |
| 5872 | } |
| 5873 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5874 | // Make sure the last iterator is deallocated. |
| 5875 | delete space_iterator_; |
| 5876 | space_iterator_ = NULL; |
| 5877 | object_iterator_ = NULL; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5878 | delete filter_; |
| 5879 | filter_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5880 | } |
| 5881 | |
| 5882 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5883 | HeapObject* HeapIterator::next() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5884 | if (filter_ == NULL) return NextObject(); |
| 5885 | |
| 5886 | HeapObject* obj = NextObject(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5887 | while (obj != NULL && filter_->SkipObject(obj)) obj = NextObject(); |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5888 | return obj; |
| 5889 | } |
| 5890 | |
| 5891 | |
| 5892 | HeapObject* HeapIterator::NextObject() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5893 | // No iterator means we are done. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5894 | if (object_iterator_ == NULL) return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5895 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5896 | if (HeapObject* obj = object_iterator_->next_object()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5897 | // If the current iterator has more objects we are fine. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5898 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5899 | } else { |
| 5900 | // Go though the spaces looking for one that has objects. |
| 5901 | while (space_iterator_->has_next()) { |
| 5902 | object_iterator_ = space_iterator_->next(); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5903 | if (HeapObject* obj = object_iterator_->next_object()) { |
| 5904 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5905 | } |
| 5906 | } |
| 5907 | } |
| 5908 | // Done with the last space. |
| 5909 | object_iterator_ = NULL; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5910 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5911 | } |
| 5912 | |
| 5913 | |
| 5914 | void HeapIterator::reset() { |
| 5915 | // Restart the iterator. |
| 5916 | Shutdown(); |
| 5917 | Init(); |
| 5918 | } |
| 5919 | |
| 5920 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5921 | #if defined(DEBUG) || defined(LIVE_OBJECT_LIST) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5922 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5923 | Object* const PathTracer::kAnyGlobalObject = reinterpret_cast<Object*>(NULL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5924 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5925 | class PathTracer::MarkVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5926 | public: |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5927 | explicit MarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5928 | void VisitPointers(Object** start, Object** end) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5929 | // Scan all HeapObject pointers in [start, end) |
| 5930 | for (Object** p = start; !tracer_->found() && (p < end); p++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5931 | if ((*p)->IsHeapObject()) |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5932 | tracer_->MarkRecursively(p, this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5933 | } |
| 5934 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5935 | |
| 5936 | private: |
| 5937 | PathTracer* tracer_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5938 | }; |
| 5939 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5940 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5941 | class PathTracer::UnmarkVisitor: public ObjectVisitor { |
| 5942 | public: |
| 5943 | explicit UnmarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
| 5944 | void VisitPointers(Object** start, Object** end) { |
| 5945 | // Scan all HeapObject pointers in [start, end) |
| 5946 | for (Object** p = start; p < end; p++) { |
| 5947 | if ((*p)->IsHeapObject()) |
| 5948 | tracer_->UnmarkRecursively(p, this); |
| 5949 | } |
| 5950 | } |
| 5951 | |
| 5952 | private: |
| 5953 | PathTracer* tracer_; |
| 5954 | }; |
| 5955 | |
| 5956 | |
| 5957 | void PathTracer::VisitPointers(Object** start, Object** end) { |
| 5958 | bool done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 5959 | // Visit all HeapObject pointers in [start, end) |
| 5960 | for (Object** p = start; !done && (p < end); p++) { |
| 5961 | if ((*p)->IsHeapObject()) { |
| 5962 | TracePathFrom(p); |
| 5963 | done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 5964 | } |
| 5965 | } |
| 5966 | } |
| 5967 | |
| 5968 | |
| 5969 | void PathTracer::Reset() { |
| 5970 | found_target_ = false; |
| 5971 | object_stack_.Clear(); |
| 5972 | } |
| 5973 | |
| 5974 | |
| 5975 | void PathTracer::TracePathFrom(Object** root) { |
| 5976 | ASSERT((search_target_ == kAnyGlobalObject) || |
| 5977 | search_target_->IsHeapObject()); |
| 5978 | found_target_in_trace_ = false; |
| 5979 | object_stack_.Clear(); |
| 5980 | |
| 5981 | MarkVisitor mark_visitor(this); |
| 5982 | MarkRecursively(root, &mark_visitor); |
| 5983 | |
| 5984 | UnmarkVisitor unmark_visitor(this); |
| 5985 | UnmarkRecursively(root, &unmark_visitor); |
| 5986 | |
| 5987 | ProcessResults(); |
| 5988 | } |
| 5989 | |
| 5990 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 5991 | static bool SafeIsGlobalContext(HeapObject* obj) { |
| 5992 | return obj->map() == obj->GetHeap()->raw_unchecked_global_context_map(); |
| 5993 | } |
| 5994 | |
| 5995 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5996 | void PathTracer::MarkRecursively(Object** p, MarkVisitor* mark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5997 | if (!(*p)->IsHeapObject()) return; |
| 5998 | |
| 5999 | HeapObject* obj = HeapObject::cast(*p); |
| 6000 | |
| 6001 | Object* map = obj->map(); |
| 6002 | |
| 6003 | if (!map->IsHeapObject()) return; // visited before |
| 6004 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6005 | if (found_target_in_trace_) return; // stop if target found |
| 6006 | object_stack_.Add(obj); |
| 6007 | if (((search_target_ == kAnyGlobalObject) && obj->IsJSGlobalObject()) || |
| 6008 | (obj == search_target_)) { |
| 6009 | found_target_in_trace_ = true; |
| 6010 | found_target_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6011 | return; |
| 6012 | } |
| 6013 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6014 | bool is_global_context = SafeIsGlobalContext(obj); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6015 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6016 | // not visited yet |
| 6017 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 6018 | |
| 6019 | Address map_addr = map_p->address(); |
| 6020 | |
| 6021 | obj->set_map(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
| 6022 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6023 | // Scan the object body. |
| 6024 | if (is_global_context && (visit_mode_ == VISIT_ONLY_STRONG)) { |
| 6025 | // This is specialized to scan Context's properly. |
| 6026 | Object** start = reinterpret_cast<Object**>(obj->address() + |
| 6027 | Context::kHeaderSize); |
| 6028 | Object** end = reinterpret_cast<Object**>(obj->address() + |
| 6029 | Context::kHeaderSize + Context::FIRST_WEAK_SLOT * kPointerSize); |
| 6030 | mark_visitor->VisitPointers(start, end); |
| 6031 | } else { |
| 6032 | obj->IterateBody(map_p->instance_type(), |
| 6033 | obj->SizeFromMap(map_p), |
| 6034 | mark_visitor); |
| 6035 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6036 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6037 | // Scan the map after the body because the body is a lot more interesting |
| 6038 | // when doing leak detection. |
| 6039 | MarkRecursively(&map, mark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6040 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6041 | if (!found_target_in_trace_) // don't pop if found the target |
| 6042 | object_stack_.RemoveLast(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6043 | } |
| 6044 | |
| 6045 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6046 | void PathTracer::UnmarkRecursively(Object** p, UnmarkVisitor* unmark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6047 | if (!(*p)->IsHeapObject()) return; |
| 6048 | |
| 6049 | HeapObject* obj = HeapObject::cast(*p); |
| 6050 | |
| 6051 | Object* map = obj->map(); |
| 6052 | |
| 6053 | if (map->IsHeapObject()) return; // unmarked already |
| 6054 | |
| 6055 | Address map_addr = reinterpret_cast<Address>(map); |
| 6056 | |
| 6057 | map_addr -= kMarkTag; |
| 6058 | |
| 6059 | ASSERT_TAG_ALIGNED(map_addr); |
| 6060 | |
| 6061 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 6062 | |
| 6063 | obj->set_map(reinterpret_cast<Map*>(map_p)); |
| 6064 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6065 | UnmarkRecursively(reinterpret_cast<Object**>(&map_p), unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6066 | |
| 6067 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 6068 | obj->SizeFromMap(Map::cast(map_p)), |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6069 | unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6070 | } |
| 6071 | |
| 6072 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6073 | void PathTracer::ProcessResults() { |
| 6074 | if (found_target_) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6075 | PrintF("=====================================\n"); |
| 6076 | PrintF("==== Path to object ====\n"); |
| 6077 | PrintF("=====================================\n\n"); |
| 6078 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6079 | ASSERT(!object_stack_.is_empty()); |
| 6080 | for (int i = 0; i < object_stack_.length(); i++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6081 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6082 | Object* obj = object_stack_[i]; |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 6083 | #ifdef OBJECT_PRINT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6084 | obj->Print(); |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 6085 | #else |
| 6086 | obj->ShortPrint(); |
| 6087 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6088 | } |
| 6089 | PrintF("=====================================\n"); |
| 6090 | } |
| 6091 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6092 | #endif // DEBUG || LIVE_OBJECT_LIST |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6093 | |
| 6094 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6095 | #ifdef DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6096 | // Triggers a depth-first traversal of reachable objects from roots |
| 6097 | // 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] | 6098 | void Heap::TracePathToObject(Object* target) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6099 | PathTracer tracer(target, PathTracer::FIND_ALL, VISIT_ALL); |
| 6100 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6101 | } |
| 6102 | |
| 6103 | |
| 6104 | // Triggers a depth-first traversal of reachable objects from roots |
| 6105 | // and finds a path to any global object and prints it. Useful for |
| 6106 | // determining the source for leaks of global objects. |
| 6107 | void Heap::TracePathToGlobal() { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 6108 | PathTracer tracer(PathTracer::kAnyGlobalObject, |
| 6109 | PathTracer::FIND_ALL, |
| 6110 | VISIT_ALL); |
| 6111 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6112 | } |
| 6113 | #endif |
| 6114 | |
| 6115 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6116 | static intptr_t CountTotalHolesSize() { |
| 6117 | intptr_t holes_size = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6118 | OldSpaces spaces; |
| 6119 | for (OldSpace* space = spaces.next(); |
| 6120 | space != NULL; |
| 6121 | space = spaces.next()) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6122 | holes_size += space->Waste() + space->Available(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6123 | } |
| 6124 | return holes_size; |
| 6125 | } |
| 6126 | |
| 6127 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6128 | GCTracer::GCTracer(Heap* heap) |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6129 | : start_time_(0.0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6130 | start_size_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6131 | gc_count_(0), |
| 6132 | full_gc_count_(0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6133 | allocated_since_last_gc_(0), |
| 6134 | spent_in_mutator_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6135 | promoted_objects_size_(0), |
| 6136 | heap_(heap) { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6137 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6138 | start_time_ = OS::TimeCurrentMillis(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6139 | start_size_ = heap_->SizeOfObjects(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6140 | |
| 6141 | for (int i = 0; i < Scope::kNumberOfScopes; i++) { |
| 6142 | scopes_[i] = 0; |
| 6143 | } |
| 6144 | |
| 6145 | in_free_list_or_wasted_before_gc_ = CountTotalHolesSize(); |
| 6146 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6147 | allocated_since_last_gc_ = |
| 6148 | heap_->SizeOfObjects() - heap_->alive_after_last_gc_; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6149 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6150 | if (heap_->last_gc_end_timestamp_ > 0) { |
| 6151 | 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] | 6152 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6153 | |
| 6154 | steps_count_ = heap_->incremental_marking()->steps_count(); |
| 6155 | steps_took_ = heap_->incremental_marking()->steps_took(); |
| 6156 | longest_step_ = heap_->incremental_marking()->longest_step(); |
| 6157 | steps_count_since_last_gc_ = |
| 6158 | heap_->incremental_marking()->steps_count_since_last_gc(); |
| 6159 | steps_took_since_last_gc_ = |
| 6160 | heap_->incremental_marking()->steps_took_since_last_gc(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6161 | } |
| 6162 | |
| 6163 | |
| 6164 | GCTracer::~GCTracer() { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6165 | // Printf ONE line iff flag is set. |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6166 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
| 6167 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6168 | bool first_gc = (heap_->last_gc_end_timestamp_ == 0); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6169 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6170 | heap_->alive_after_last_gc_ = heap_->SizeOfObjects(); |
| 6171 | heap_->last_gc_end_timestamp_ = OS::TimeCurrentMillis(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6172 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6173 | 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] | 6174 | |
| 6175 | // Update cumulative GC statistics if required. |
| 6176 | if (FLAG_print_cumulative_gc_stat) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6177 | heap_->max_gc_pause_ = Max(heap_->max_gc_pause_, time); |
| 6178 | heap_->max_alive_after_gc_ = Max(heap_->max_alive_after_gc_, |
| 6179 | heap_->alive_after_last_gc_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6180 | if (!first_gc) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6181 | heap_->min_in_mutator_ = Min(heap_->min_in_mutator_, |
| 6182 | static_cast<int>(spent_in_mutator_)); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6183 | } |
| 6184 | } |
| 6185 | |
| 6186 | if (!FLAG_trace_gc_nvp) { |
| 6187 | int external_time = static_cast<int>(scopes_[Scope::EXTERNAL]); |
| 6188 | |
| 6189 | PrintF("%s %.1f -> %.1f MB, ", |
| 6190 | CollectorString(), |
| 6191 | static_cast<double>(start_size_) / MB, |
| 6192 | SizeOfHeapObjects()); |
| 6193 | |
| 6194 | if (external_time > 0) PrintF("%d / ", external_time); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6195 | PrintF("%d ms", time); |
| 6196 | if (steps_count_ > 0) { |
| 6197 | if (collector_ == SCAVENGER) { |
| 6198 | PrintF(" (+ %d ms in %d steps since last GC)", |
| 6199 | static_cast<int>(steps_took_since_last_gc_), |
| 6200 | steps_count_since_last_gc_); |
| 6201 | } else { |
| 6202 | PrintF(" (+ %d ms in %d steps since start of marking, " |
| 6203 | "biggest step %f ms)", |
| 6204 | static_cast<int>(steps_took_), |
| 6205 | steps_count_, |
| 6206 | longest_step_); |
| 6207 | } |
| 6208 | } |
| 6209 | PrintF(".\n"); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6210 | } else { |
| 6211 | PrintF("pause=%d ", time); |
| 6212 | PrintF("mutator=%d ", |
| 6213 | static_cast<int>(spent_in_mutator_)); |
| 6214 | |
| 6215 | PrintF("gc="); |
| 6216 | switch (collector_) { |
| 6217 | case SCAVENGER: |
| 6218 | PrintF("s"); |
| 6219 | break; |
| 6220 | case MARK_COMPACTOR: |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6221 | PrintF("ms"); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6222 | break; |
| 6223 | default: |
| 6224 | UNREACHABLE(); |
| 6225 | } |
| 6226 | PrintF(" "); |
| 6227 | |
| 6228 | PrintF("external=%d ", static_cast<int>(scopes_[Scope::EXTERNAL])); |
| 6229 | PrintF("mark=%d ", static_cast<int>(scopes_[Scope::MC_MARK])); |
| 6230 | PrintF("sweep=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP])); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 6231 | PrintF("sweepns=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP_NEWSPACE])); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6232 | PrintF("compact=%d ", static_cast<int>(scopes_[Scope::MC_COMPACT])); |
| 6233 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6234 | PrintF("total_size_before=%" V8_PTR_PREFIX "d ", start_size_); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6235 | PrintF("total_size_after=%" V8_PTR_PREFIX "d ", heap_->SizeOfObjects()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6236 | PrintF("holes_size_before=%" V8_PTR_PREFIX "d ", |
| 6237 | in_free_list_or_wasted_before_gc_); |
| 6238 | PrintF("holes_size_after=%" V8_PTR_PREFIX "d ", CountTotalHolesSize()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6239 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 6240 | PrintF("allocated=%" V8_PTR_PREFIX "d ", allocated_since_last_gc_); |
| 6241 | PrintF("promoted=%" V8_PTR_PREFIX "d ", promoted_objects_size_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6242 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6243 | if (collector_ == SCAVENGER) { |
| 6244 | PrintF("stepscount=%d ", steps_count_since_last_gc_); |
| 6245 | PrintF("stepstook=%d ", static_cast<int>(steps_took_since_last_gc_)); |
| 6246 | } else { |
| 6247 | PrintF("stepscount=%d ", steps_count_); |
| 6248 | PrintF("stepstook=%d ", static_cast<int>(steps_took_)); |
| 6249 | } |
| 6250 | |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 6251 | PrintF("\n"); |
| 6252 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 6253 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6254 | heap_->PrintShortHeapStatistics(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6255 | } |
| 6256 | |
| 6257 | |
| 6258 | const char* GCTracer::CollectorString() { |
| 6259 | switch (collector_) { |
| 6260 | case SCAVENGER: |
| 6261 | return "Scavenge"; |
| 6262 | case MARK_COMPACTOR: |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6263 | return "Mark-sweep"; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 6264 | } |
| 6265 | return "Unknown GC"; |
| 6266 | } |
| 6267 | |
| 6268 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6269 | int KeyedLookupCache::Hash(Map* map, String* name) { |
| 6270 | // Uses only lower 32 bits if pointers are larger. |
| 6271 | uintptr_t addr_hash = |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6272 | static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> kMapHashShift; |
fschneider@chromium.org | b95b98b | 2010-02-23 10:34:29 +0000 | [diff] [blame] | 6273 | return static_cast<uint32_t>((addr_hash ^ name->Hash()) & kCapacityMask); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6274 | } |
| 6275 | |
| 6276 | |
| 6277 | int KeyedLookupCache::Lookup(Map* map, String* name) { |
| 6278 | int index = Hash(map, name); |
| 6279 | Key& key = keys_[index]; |
| 6280 | if ((key.map == map) && key.name->Equals(name)) { |
| 6281 | return field_offsets_[index]; |
| 6282 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6283 | return kNotFound; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6284 | } |
| 6285 | |
| 6286 | |
| 6287 | void KeyedLookupCache::Update(Map* map, String* name, int field_offset) { |
| 6288 | String* symbol; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6289 | if (HEAP->LookupSymbolIfExists(name, &symbol)) { |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6290 | int index = Hash(map, symbol); |
| 6291 | Key& key = keys_[index]; |
| 6292 | key.map = map; |
| 6293 | key.name = symbol; |
| 6294 | field_offsets_[index] = field_offset; |
| 6295 | } |
| 6296 | } |
| 6297 | |
| 6298 | |
| 6299 | void KeyedLookupCache::Clear() { |
| 6300 | for (int index = 0; index < kLength; index++) keys_[index].map = NULL; |
| 6301 | } |
| 6302 | |
| 6303 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6304 | void DescriptorLookupCache::Clear() { |
| 6305 | for (int index = 0; index < kLength; index++) keys_[index].array = NULL; |
| 6306 | } |
| 6307 | |
| 6308 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6309 | #ifdef DEBUG |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 6310 | void Heap::GarbageCollectionGreedyCheck() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6311 | ASSERT(FLAG_gc_greedy); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6312 | if (isolate_->bootstrapper()->IsActive()) return; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 6313 | if (disallow_allocation_failure()) return; |
| 6314 | CollectGarbage(NEW_SPACE); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6315 | } |
| 6316 | #endif |
| 6317 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6318 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6319 | TranscendentalCache::SubCache::SubCache(Type t) |
| 6320 | : type_(t), |
| 6321 | isolate_(Isolate::Current()) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6322 | uint32_t in0 = 0xffffffffu; // Bit-pattern for a NaN that isn't |
| 6323 | uint32_t in1 = 0xffffffffu; // generated by the FPU. |
| 6324 | for (int i = 0; i < kCacheSize; i++) { |
| 6325 | elements_[i].in[0] = in0; |
| 6326 | elements_[i].in[1] = in1; |
| 6327 | elements_[i].output = NULL; |
| 6328 | } |
| 6329 | } |
| 6330 | |
| 6331 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6332 | void TranscendentalCache::Clear() { |
| 6333 | for (int i = 0; i < kNumberOfCaches; i++) { |
| 6334 | if (caches_[i] != NULL) { |
| 6335 | delete caches_[i]; |
| 6336 | caches_[i] = NULL; |
| 6337 | } |
| 6338 | } |
| 6339 | } |
| 6340 | |
| 6341 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6342 | void ExternalStringTable::CleanUp() { |
| 6343 | int last = 0; |
| 6344 | for (int i = 0; i < new_space_strings_.length(); ++i) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6345 | if (new_space_strings_[i] == heap_->raw_unchecked_null_value()) continue; |
| 6346 | if (heap_->InNewSpace(new_space_strings_[i])) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6347 | new_space_strings_[last++] = new_space_strings_[i]; |
| 6348 | } else { |
| 6349 | old_space_strings_.Add(new_space_strings_[i]); |
| 6350 | } |
| 6351 | } |
| 6352 | new_space_strings_.Rewind(last); |
| 6353 | last = 0; |
| 6354 | for (int i = 0; i < old_space_strings_.length(); ++i) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6355 | if (old_space_strings_[i] == heap_->raw_unchecked_null_value()) continue; |
| 6356 | ASSERT(!heap_->InNewSpace(old_space_strings_[i])); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6357 | old_space_strings_[last++] = old_space_strings_[i]; |
| 6358 | } |
| 6359 | old_space_strings_.Rewind(last); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame^] | 6360 | if (FLAG_verify_heap) { |
| 6361 | Verify(); |
| 6362 | } |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6363 | } |
| 6364 | |
| 6365 | |
| 6366 | void ExternalStringTable::TearDown() { |
| 6367 | new_space_strings_.Free(); |
| 6368 | old_space_strings_.Free(); |
| 6369 | } |
| 6370 | |
| 6371 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 6372 | void Heap::QueueMemoryChunkForFree(MemoryChunk* chunk) { |
| 6373 | chunk->set_next_chunk(chunks_queued_for_free_); |
| 6374 | chunks_queued_for_free_ = chunk; |
| 6375 | } |
| 6376 | |
| 6377 | |
| 6378 | void Heap::FreeQueuedChunks() { |
| 6379 | if (chunks_queued_for_free_ == NULL) return; |
| 6380 | MemoryChunk* next; |
| 6381 | MemoryChunk* chunk; |
| 6382 | for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) { |
| 6383 | next = chunk->next_chunk(); |
| 6384 | chunk->SetFlag(MemoryChunk::ABOUT_TO_BE_FREED); |
| 6385 | |
| 6386 | if (chunk->owner()->identity() == LO_SPACE) { |
| 6387 | // StoreBuffer::Filter relies on MemoryChunk::FromAnyPointerAddress. |
| 6388 | // If FromAnyPointerAddress encounters a slot that belongs to a large |
| 6389 | // chunk queued for deletion it will fail to find the chunk because |
| 6390 | // it try to perform a search in the list of pages owned by of the large |
| 6391 | // object space and queued chunks were detached from that list. |
| 6392 | // To work around this we split large chunk into normal kPageSize aligned |
| 6393 | // pieces and initialize owner field and flags of every piece. |
| 6394 | // If FromAnyPointerAddress encounteres a slot that belongs to one of |
| 6395 | // these smaller pieces it will treat it as a slot on a normal Page. |
| 6396 | MemoryChunk* inner = MemoryChunk::FromAddress( |
| 6397 | chunk->address() + Page::kPageSize); |
| 6398 | MemoryChunk* inner_last = MemoryChunk::FromAddress( |
| 6399 | chunk->address() + chunk->size() - 1); |
| 6400 | while (inner <= inner_last) { |
| 6401 | // Size of a large chunk is always a multiple of |
| 6402 | // OS::AllocationAlignment() so there is always |
| 6403 | // enough space for a fake MemoryChunk header. |
| 6404 | inner->set_owner(lo_space()); |
| 6405 | inner->SetFlag(MemoryChunk::ABOUT_TO_BE_FREED); |
| 6406 | inner = MemoryChunk::FromAddress( |
| 6407 | inner->address() + Page::kPageSize); |
| 6408 | } |
| 6409 | } |
| 6410 | } |
| 6411 | isolate_->heap()->store_buffer()->Compact(); |
| 6412 | isolate_->heap()->store_buffer()->Filter(MemoryChunk::ABOUT_TO_BE_FREED); |
| 6413 | for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) { |
| 6414 | next = chunk->next_chunk(); |
| 6415 | isolate_->memory_allocator()->Free(chunk); |
| 6416 | } |
| 6417 | chunks_queued_for_free_ = NULL; |
| 6418 | } |
| 6419 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6420 | } } // namespace v8::internal |