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" |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 39 | #include "liveobjectlist-inl.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 40 | #include "mark-compact.h" |
| 41 | #include "natives.h" |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 42 | #include "objects-visiting.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 43 | #include "runtime-profiler.h" |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 44 | #include "scanner-base.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 45 | #include "scopeinfo.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 46 | #include "snapshot.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 47 | #include "v8threads.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 48 | #include "vm-state-inl.h" |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 49 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 50 | #include "regexp-macro-assembler.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 51 | #include "arm/regexp-macro-assembler-arm.h" |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 52 | #endif |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 53 | #if V8_TARGET_ARCH_MIPS && !V8_INTERPRETED_REGEXP |
| 54 | #include "regexp-macro-assembler.h" |
| 55 | #include "mips/regexp-macro-assembler-mips.h" |
| 56 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 57 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 58 | namespace v8 { |
| 59 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 60 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 61 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 62 | static const intptr_t kMinimumPromotionLimit = 2 * MB; |
| 63 | static const intptr_t kMinimumAllocationLimit = 8 * MB; |
| 64 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 65 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 66 | static Mutex* gc_initializer_mutex = OS::CreateMutex(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 67 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 68 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 69 | Heap::Heap() |
| 70 | : isolate_(NULL), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 71 | // semispace_size_ should be a power of 2 and old_generation_size_ should be |
| 72 | // a multiple of Page::kPageSize. |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 73 | #if defined(ANDROID) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 74 | reserved_semispace_size_(2*MB), |
| 75 | max_semispace_size_(2*MB), |
| 76 | initial_semispace_size_(128*KB), |
| 77 | max_old_generation_size_(192*MB), |
| 78 | max_executable_size_(max_old_generation_size_), |
| 79 | code_range_size_(0), |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 80 | #elif defined(V8_TARGET_ARCH_X64) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 81 | reserved_semispace_size_(16*MB), |
| 82 | max_semispace_size_(16*MB), |
| 83 | initial_semispace_size_(1*MB), |
| 84 | max_old_generation_size_(1*GB), |
| 85 | max_executable_size_(256*MB), |
| 86 | code_range_size_(512*MB), |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 87 | #else |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 88 | reserved_semispace_size_(8*MB), |
| 89 | max_semispace_size_(8*MB), |
| 90 | initial_semispace_size_(512*KB), |
| 91 | max_old_generation_size_(512*MB), |
| 92 | max_executable_size_(128*MB), |
| 93 | code_range_size_(0), |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 94 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 95 | // Variables set based on semispace_size_ and old_generation_size_ in |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 96 | // ConfigureHeap (survived_since_last_expansion_, external_allocation_limit_) |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 97 | // Will be 4 * reserved_semispace_size_ to ensure that young |
| 98 | // generation can be aligned to its size. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 99 | survived_since_last_expansion_(0), |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 100 | sweep_generation_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 101 | always_allocate_scope_depth_(0), |
| 102 | linear_allocation_scope_depth_(0), |
| 103 | contexts_disposed_(0), |
| 104 | new_space_(this), |
| 105 | old_pointer_space_(NULL), |
| 106 | old_data_space_(NULL), |
| 107 | code_space_(NULL), |
| 108 | map_space_(NULL), |
| 109 | cell_space_(NULL), |
| 110 | lo_space_(NULL), |
| 111 | gc_state_(NOT_IN_GC), |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 112 | gc_post_processing_depth_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 113 | mc_count_(0), |
| 114 | ms_count_(0), |
| 115 | gc_count_(0), |
| 116 | unflattened_strings_length_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 117 | #ifdef DEBUG |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 118 | allocation_allowed_(true), |
| 119 | allocation_timeout_(0), |
| 120 | disallow_allocation_failure_(false), |
| 121 | debug_utils_(NULL), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 122 | #endif // DEBUG |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 123 | old_gen_promotion_limit_(kMinimumPromotionLimit), |
| 124 | old_gen_allocation_limit_(kMinimumAllocationLimit), |
| 125 | external_allocation_limit_(0), |
| 126 | amount_of_external_allocated_memory_(0), |
| 127 | amount_of_external_allocated_memory_at_last_global_gc_(0), |
| 128 | old_gen_exhausted_(false), |
| 129 | hidden_symbol_(NULL), |
| 130 | global_gc_prologue_callback_(NULL), |
| 131 | global_gc_epilogue_callback_(NULL), |
| 132 | gc_safe_size_of_old_object_(NULL), |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 133 | total_regexp_code_generated_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 134 | tracer_(NULL), |
| 135 | young_survivors_after_last_gc_(0), |
| 136 | high_survival_rate_period_length_(0), |
| 137 | survival_rate_(0), |
| 138 | previous_survival_rate_trend_(Heap::STABLE), |
| 139 | survival_rate_trend_(Heap::STABLE), |
| 140 | max_gc_pause_(0), |
| 141 | max_alive_after_gc_(0), |
| 142 | min_in_mutator_(kMaxInt), |
| 143 | alive_after_last_gc_(0), |
| 144 | last_gc_end_timestamp_(0.0), |
| 145 | page_watermark_invalidated_mark_(1 << Page::WATERMARK_INVALIDATED), |
| 146 | number_idle_notifications_(0), |
| 147 | last_idle_notification_gc_count_(0), |
| 148 | last_idle_notification_gc_count_init_(false), |
| 149 | configured_(false), |
| 150 | is_safe_to_read_maps_(true) { |
| 151 | // Allow build-time customization of the max semispace size. Building |
| 152 | // V8 with snapshots and a non-default max semispace size is much |
| 153 | // easier if you can define it as part of the build environment. |
| 154 | #if defined(V8_MAX_SEMISPACE_SIZE) |
| 155 | max_semispace_size_ = reserved_semispace_size_ = V8_MAX_SEMISPACE_SIZE; |
| 156 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 157 | |
lrn@chromium.org | ac2828d | 2011-06-23 06:29:21 +0000 | [diff] [blame] | 158 | intptr_t max_virtual = OS::MaxVirtualMemory(); |
| 159 | |
| 160 | if (max_virtual > 0) { |
| 161 | if (code_range_size_ > 0) { |
| 162 | // Reserve no more than 1/8 of the memory for the code range. |
| 163 | code_range_size_ = Min(code_range_size_, max_virtual >> 3); |
| 164 | } |
| 165 | } |
| 166 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 167 | memset(roots_, 0, sizeof(roots_[0]) * kRootListLength); |
| 168 | global_contexts_list_ = NULL; |
| 169 | mark_compact_collector_.heap_ = this; |
| 170 | external_string_table_.heap_ = this; |
| 171 | } |
| 172 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 173 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 174 | intptr_t Heap::Capacity() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 175 | if (!HasBeenSetup()) return 0; |
| 176 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 177 | return new_space_.Capacity() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 178 | old_pointer_space_->Capacity() + |
| 179 | old_data_space_->Capacity() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 180 | code_space_->Capacity() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 181 | map_space_->Capacity() + |
| 182 | cell_space_->Capacity(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 186 | intptr_t Heap::CommittedMemory() { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 187 | if (!HasBeenSetup()) return 0; |
| 188 | |
| 189 | return new_space_.CommittedMemory() + |
| 190 | old_pointer_space_->CommittedMemory() + |
| 191 | old_data_space_->CommittedMemory() + |
| 192 | code_space_->CommittedMemory() + |
| 193 | map_space_->CommittedMemory() + |
| 194 | cell_space_->CommittedMemory() + |
| 195 | lo_space_->Size(); |
| 196 | } |
| 197 | |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 198 | intptr_t Heap::CommittedMemoryExecutable() { |
| 199 | if (!HasBeenSetup()) return 0; |
| 200 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 201 | return isolate()->memory_allocator()->SizeExecutable(); |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 202 | } |
| 203 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 204 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 205 | intptr_t Heap::Available() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 206 | if (!HasBeenSetup()) return 0; |
| 207 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 208 | return new_space_.Available() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 209 | old_pointer_space_->Available() + |
| 210 | old_data_space_->Available() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 211 | code_space_->Available() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 212 | map_space_->Available() + |
| 213 | cell_space_->Available(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | |
| 217 | bool Heap::HasBeenSetup() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 218 | return old_pointer_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 219 | old_data_space_ != NULL && |
| 220 | code_space_ != NULL && |
| 221 | map_space_ != NULL && |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 222 | cell_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 223 | lo_space_ != NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 227 | int Heap::GcSafeSizeOfOldObject(HeapObject* object) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 228 | ASSERT(!HEAP->InNewSpace(object)); // Code only works for old objects. |
| 229 | ASSERT(!HEAP->mark_compact_collector()->are_map_pointers_encoded()); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 230 | MapWord map_word = object->map_word(); |
| 231 | map_word.ClearMark(); |
| 232 | map_word.ClearOverflow(); |
| 233 | return object->SizeFromMap(map_word.ToMap()); |
| 234 | } |
| 235 | |
| 236 | |
| 237 | int Heap::GcSafeSizeOfOldObjectWithEncodedMap(HeapObject* object) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 238 | ASSERT(!HEAP->InNewSpace(object)); // Code only works for old objects. |
| 239 | ASSERT(HEAP->mark_compact_collector()->are_map_pointers_encoded()); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 240 | uint32_t marker = Memory::uint32_at(object->address()); |
| 241 | if (marker == MarkCompactCollector::kSingleFreeEncoding) { |
| 242 | return kIntSize; |
| 243 | } else if (marker == MarkCompactCollector::kMultiFreeEncoding) { |
| 244 | return Memory::int_at(object->address() + kIntSize); |
| 245 | } else { |
| 246 | MapWord map_word = object->map_word(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 247 | Address map_address = map_word.DecodeMapAddress(HEAP->map_space()); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 248 | Map* map = reinterpret_cast<Map*>(HeapObject::FromAddress(map_address)); |
| 249 | return object->SizeFromMap(map); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 254 | GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space) { |
| 255 | // Is global GC requested? |
| 256 | if (space != NEW_SPACE || FLAG_gc_global) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 257 | isolate_->counters()->gc_compactor_caused_by_request()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 258 | return MARK_COMPACTOR; |
| 259 | } |
| 260 | |
| 261 | // Is enough data promoted to justify a global GC? |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 262 | if (OldGenerationPromotionLimitReached()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 263 | isolate_->counters()->gc_compactor_caused_by_promoted_data()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 264 | return MARK_COMPACTOR; |
| 265 | } |
| 266 | |
| 267 | // Have allocation in OLD and LO failed? |
| 268 | if (old_gen_exhausted_) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 269 | isolate_->counters()-> |
| 270 | gc_compactor_caused_by_oldspace_exhaustion()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 271 | return MARK_COMPACTOR; |
| 272 | } |
| 273 | |
| 274 | // Is there enough space left in OLD to guarantee that a scavenge can |
| 275 | // succeed? |
| 276 | // |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 277 | // Note that MemoryAllocator->MaxAvailable() undercounts the memory available |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 278 | // for object promotion. It counts only the bytes that the memory |
| 279 | // allocator has not yet allocated from the OS and assigned to any space, |
| 280 | // and does not count available bytes already in the old space or code |
| 281 | // space. Undercounting is safe---we may get an unrequested full GC when |
| 282 | // a scavenge would have succeeded. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 283 | if (isolate_->memory_allocator()->MaxAvailable() <= new_space_.Size()) { |
| 284 | isolate_->counters()-> |
| 285 | gc_compactor_caused_by_oldspace_exhaustion()->Increment(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 286 | return MARK_COMPACTOR; |
| 287 | } |
| 288 | |
| 289 | // Default |
| 290 | return SCAVENGER; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 295 | // --log-gc to avoid the complicated preprocessor and flag testing. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 296 | void Heap::ReportStatisticsBeforeGC() { |
| 297 | // Heap::ReportHeapStatistics will also log NewSpace statistics when |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 298 | // compiled --log-gc is set. The following logic is used to avoid |
| 299 | // double logging. |
| 300 | #ifdef DEBUG |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 301 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 302 | if (FLAG_heap_stats) { |
| 303 | ReportHeapStatistics("Before GC"); |
| 304 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 305 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 306 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 307 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.ClearHistograms(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 308 | #else |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 309 | if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 310 | new_space_.CollectStatistics(); |
| 311 | new_space_.ReportStatistics(); |
| 312 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 313 | } |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 314 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 318 | void Heap::PrintShortHeapStatistics() { |
| 319 | if (!FLAG_trace_gc_verbose) return; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 320 | PrintF("Memory allocator, used: %8" V8_PTR_PREFIX "d" |
| 321 | ", available: %8" V8_PTR_PREFIX "d\n", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 322 | isolate_->memory_allocator()->Size(), |
| 323 | isolate_->memory_allocator()->Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 324 | PrintF("New space, used: %8" V8_PTR_PREFIX "d" |
| 325 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 326 | Heap::new_space_.Size(), |
| 327 | new_space_.Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 328 | PrintF("Old pointers, used: %8" V8_PTR_PREFIX "d" |
| 329 | ", available: %8" V8_PTR_PREFIX "d" |
| 330 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 331 | old_pointer_space_->Size(), |
| 332 | old_pointer_space_->Available(), |
| 333 | old_pointer_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 334 | PrintF("Old data space, used: %8" V8_PTR_PREFIX "d" |
| 335 | ", available: %8" V8_PTR_PREFIX "d" |
| 336 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 337 | old_data_space_->Size(), |
| 338 | old_data_space_->Available(), |
| 339 | old_data_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 340 | PrintF("Code space, used: %8" V8_PTR_PREFIX "d" |
| 341 | ", available: %8" V8_PTR_PREFIX "d" |
| 342 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 343 | code_space_->Size(), |
| 344 | code_space_->Available(), |
| 345 | code_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 346 | PrintF("Map space, used: %8" V8_PTR_PREFIX "d" |
| 347 | ", available: %8" V8_PTR_PREFIX "d" |
| 348 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 349 | map_space_->Size(), |
| 350 | map_space_->Available(), |
| 351 | map_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 352 | PrintF("Cell space, used: %8" V8_PTR_PREFIX "d" |
| 353 | ", available: %8" V8_PTR_PREFIX "d" |
| 354 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 355 | cell_space_->Size(), |
| 356 | cell_space_->Available(), |
| 357 | cell_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 358 | PrintF("Large object space, used: %8" V8_PTR_PREFIX "d" |
| 359 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 360 | lo_space_->Size(), |
| 361 | lo_space_->Available()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 362 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 363 | |
| 364 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 365 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 366 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 367 | void Heap::ReportStatisticsAfterGC() { |
| 368 | // Similar to the before GC, we use some complicated logic to ensure that |
| 369 | // 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] | 370 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 371 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 372 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 373 | ReportHeapStatistics("After GC"); |
| 374 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 375 | new_space_.ReportStatistics(); |
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 | #else |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 378 | if (FLAG_log_gc) new_space_.ReportStatistics(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 379 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 380 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 381 | |
| 382 | |
| 383 | void Heap::GarbageCollectionPrologue() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 384 | isolate_->transcendental_cache()->Clear(); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 385 | ClearJSFunctionResultCaches(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 386 | gc_count_++; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 387 | unflattened_strings_length_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 388 | #ifdef DEBUG |
| 389 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 390 | allow_allocation(false); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 391 | |
| 392 | if (FLAG_verify_heap) { |
| 393 | Verify(); |
| 394 | } |
| 395 | |
| 396 | if (FLAG_gc_verbose) Print(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 397 | #endif // DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 398 | |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 399 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 400 | ReportStatisticsBeforeGC(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 401 | #endif // DEBUG |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 402 | |
| 403 | LiveObjectList::GCPrologue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 404 | } |
| 405 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 406 | intptr_t Heap::SizeOfObjects() { |
| 407 | intptr_t total = 0; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 408 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 409 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 410 | total += space->SizeOfObjects(); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 411 | } |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 412 | return total; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | void Heap::GarbageCollectionEpilogue() { |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 416 | LiveObjectList::GCEpilogue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 417 | #ifdef DEBUG |
| 418 | allow_allocation(true); |
| 419 | ZapFromSpace(); |
| 420 | |
| 421 | if (FLAG_verify_heap) { |
| 422 | Verify(); |
| 423 | } |
| 424 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 425 | if (FLAG_print_global_handles) isolate_->global_handles()->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 426 | if (FLAG_print_handles) PrintHandles(); |
| 427 | if (FLAG_gc_verbose) Print(); |
| 428 | if (FLAG_code_stats) ReportCodeStatistics("After GC"); |
| 429 | #endif |
| 430 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 431 | isolate_->counters()->alive_after_last_gc()->Set( |
| 432 | static_cast<int>(SizeOfObjects())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 433 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 434 | isolate_->counters()->symbol_table_capacity()->Set( |
| 435 | symbol_table()->Capacity()); |
| 436 | isolate_->counters()->number_of_symbols()->Set( |
| 437 | symbol_table()->NumberOfElements()); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 438 | #if defined(DEBUG) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 439 | ReportStatisticsAfterGC(); |
whesse@chromium.org | 030d38e | 2011-07-13 13:23:34 +0000 | [diff] [blame] | 440 | #endif // DEBUG |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 441 | #ifdef ENABLE_DEBUGGER_SUPPORT |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 442 | isolate_->debug()->AfterGarbageCollection(); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 443 | #endif // ENABLE_DEBUGGER_SUPPORT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 447 | void Heap::CollectAllGarbage(bool force_compaction) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 448 | // Since we are ignoring the return value, the exact choice of space does |
| 449 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 450 | // cause a full GC. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 451 | mark_compact_collector_.SetForceCompaction(force_compaction); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 452 | CollectGarbage(OLD_POINTER_SPACE); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 453 | mark_compact_collector_.SetForceCompaction(false); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 457 | void Heap::CollectAllAvailableGarbage() { |
| 458 | // Since we are ignoring the return value, the exact choice of space does |
| 459 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 460 | // cause a full GC. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 461 | mark_compact_collector()->SetForceCompaction(true); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 462 | |
| 463 | // Major GC would invoke weak handle callbacks on weakly reachable |
| 464 | // handles, but won't collect weakly reachable objects until next |
| 465 | // major GC. Therefore if we collect aggressively and weak handle callback |
| 466 | // has been invoked, we rerun major GC to release objects which become |
| 467 | // garbage. |
| 468 | // Note: as weak callbacks can execute arbitrary code, we cannot |
| 469 | // hope that eventually there will be no weak callbacks invocations. |
| 470 | // Therefore stop recollecting after several attempts. |
| 471 | const int kMaxNumberOfAttempts = 7; |
| 472 | for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) { |
| 473 | if (!CollectGarbage(OLD_POINTER_SPACE, MARK_COMPACTOR)) { |
| 474 | break; |
| 475 | } |
| 476 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 477 | mark_compact_collector()->SetForceCompaction(false); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | |
| 481 | bool Heap::CollectGarbage(AllocationSpace space, GarbageCollector collector) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 482 | // The VM is in the GC state until exiting this function. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 483 | VMState state(isolate_, GC); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 484 | |
| 485 | #ifdef DEBUG |
| 486 | // Reset the allocation timeout to the GC interval, but make sure to |
| 487 | // allow at least a few allocations after a collection. The reason |
| 488 | // for this is that we have a lot of allocation sequences and we |
| 489 | // assume that a garbage collection will allow the subsequent |
| 490 | // allocation attempts to go through. |
| 491 | allocation_timeout_ = Max(6, FLAG_gc_interval); |
| 492 | #endif |
| 493 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 494 | bool next_gc_likely_to_collect_more = false; |
| 495 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 496 | { GCTracer tracer(this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 497 | GarbageCollectionPrologue(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 498 | // The GC count was incremented in the prologue. Tell the tracer about |
| 499 | // it. |
| 500 | tracer.set_gc_count(gc_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 501 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 502 | // Tell the tracer which collector we've selected. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 503 | tracer.set_collector(collector); |
| 504 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 505 | HistogramTimer* rate = (collector == SCAVENGER) |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 506 | ? isolate_->counters()->gc_scavenger() |
| 507 | : isolate_->counters()->gc_compactor(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 508 | rate->Start(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 509 | next_gc_likely_to_collect_more = |
| 510 | PerformGarbageCollection(collector, &tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 511 | rate->Stop(); |
| 512 | |
| 513 | GarbageCollectionEpilogue(); |
| 514 | } |
| 515 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 516 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 520 | void Heap::PerformScavenge() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 521 | GCTracer tracer(this); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 522 | PerformGarbageCollection(SCAVENGER, &tracer); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 526 | #ifdef DEBUG |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 527 | // Helper class for verifying the symbol table. |
| 528 | class SymbolTableVerifier : public ObjectVisitor { |
| 529 | public: |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 530 | void VisitPointers(Object** start, Object** end) { |
| 531 | // Visit all HeapObject pointers in [start, end). |
| 532 | for (Object** p = start; p < end; p++) { |
| 533 | if ((*p)->IsHeapObject()) { |
| 534 | // Check that the symbol is actually a symbol. |
| 535 | ASSERT((*p)->IsNull() || (*p)->IsUndefined() || (*p)->IsSymbol()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 536 | } |
| 537 | } |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 538 | } |
| 539 | }; |
| 540 | #endif // DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 541 | |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 542 | |
| 543 | static void VerifySymbolTable() { |
| 544 | #ifdef DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 545 | SymbolTableVerifier verifier; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 546 | HEAP->symbol_table()->IterateElements(&verifier); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 547 | #endif // DEBUG |
| 548 | } |
| 549 | |
| 550 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 551 | void Heap::ReserveSpace( |
| 552 | int new_space_size, |
| 553 | int pointer_space_size, |
| 554 | int data_space_size, |
| 555 | int code_space_size, |
| 556 | int map_space_size, |
| 557 | int cell_space_size, |
| 558 | int large_object_size) { |
| 559 | NewSpace* new_space = Heap::new_space(); |
| 560 | PagedSpace* old_pointer_space = Heap::old_pointer_space(); |
| 561 | PagedSpace* old_data_space = Heap::old_data_space(); |
| 562 | PagedSpace* code_space = Heap::code_space(); |
| 563 | PagedSpace* map_space = Heap::map_space(); |
| 564 | PagedSpace* cell_space = Heap::cell_space(); |
| 565 | LargeObjectSpace* lo_space = Heap::lo_space(); |
| 566 | bool gc_performed = true; |
| 567 | while (gc_performed) { |
| 568 | gc_performed = false; |
| 569 | if (!new_space->ReserveSpace(new_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 570 | Heap::CollectGarbage(NEW_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 571 | gc_performed = true; |
| 572 | } |
| 573 | if (!old_pointer_space->ReserveSpace(pointer_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 574 | Heap::CollectGarbage(OLD_POINTER_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 575 | gc_performed = true; |
| 576 | } |
| 577 | if (!(old_data_space->ReserveSpace(data_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 578 | Heap::CollectGarbage(OLD_DATA_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 579 | gc_performed = true; |
| 580 | } |
| 581 | if (!(code_space->ReserveSpace(code_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 582 | Heap::CollectGarbage(CODE_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 583 | gc_performed = true; |
| 584 | } |
| 585 | if (!(map_space->ReserveSpace(map_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 586 | Heap::CollectGarbage(MAP_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 587 | gc_performed = true; |
| 588 | } |
| 589 | if (!(cell_space->ReserveSpace(cell_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 590 | Heap::CollectGarbage(CELL_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 591 | gc_performed = true; |
| 592 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 593 | // We add a slack-factor of 2 in order to have space for a series of |
| 594 | // 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] | 595 | large_object_size *= 2; |
| 596 | // The ReserveSpace method on the large object space checks how much |
| 597 | // we can expand the old generation. This includes expansion caused by |
| 598 | // allocation in the other spaces. |
| 599 | large_object_size += cell_space_size + map_space_size + code_space_size + |
| 600 | data_space_size + pointer_space_size; |
| 601 | if (!(lo_space->ReserveSpace(large_object_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 602 | Heap::CollectGarbage(LO_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 603 | gc_performed = true; |
| 604 | } |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 609 | void Heap::EnsureFromSpaceIsCommitted() { |
| 610 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 611 | |
| 612 | // Committing memory to from space failed. |
| 613 | // Try shrinking and try again. |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 614 | PagedSpaces spaces; |
| 615 | for (PagedSpace* space = spaces.next(); |
| 616 | space != NULL; |
| 617 | space = spaces.next()) { |
| 618 | space->RelinkPageListInChunkOrder(true); |
| 619 | } |
| 620 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 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() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 651 | if (isolate_->bootstrapper()->IsActive()) return; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 652 | |
| 653 | Object* context = global_contexts_list_; |
| 654 | while (!context->IsUndefined()) { |
| 655 | Context::cast(context)->normalized_map_cache()->Clear(); |
| 656 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 657 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 661 | #ifdef DEBUG |
| 662 | |
| 663 | enum PageWatermarkValidity { |
| 664 | ALL_VALID, |
| 665 | ALL_INVALID |
| 666 | }; |
| 667 | |
| 668 | static void VerifyPageWatermarkValidity(PagedSpace* space, |
| 669 | PageWatermarkValidity validity) { |
| 670 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 671 | bool expected_value = (validity == ALL_VALID); |
| 672 | while (it.has_next()) { |
| 673 | Page* page = it.next(); |
| 674 | ASSERT(page->IsWatermarkValid() == expected_value); |
| 675 | } |
| 676 | } |
| 677 | #endif |
| 678 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 679 | void Heap::UpdateSurvivalRateTrend(int start_new_space_size) { |
| 680 | double survival_rate = |
| 681 | (static_cast<double>(young_survivors_after_last_gc_) * 100) / |
| 682 | start_new_space_size; |
| 683 | |
| 684 | if (survival_rate > kYoungSurvivalRateThreshold) { |
| 685 | high_survival_rate_period_length_++; |
| 686 | } else { |
| 687 | high_survival_rate_period_length_ = 0; |
| 688 | } |
| 689 | |
| 690 | double survival_rate_diff = survival_rate_ - survival_rate; |
| 691 | |
| 692 | if (survival_rate_diff > kYoungSurvivalRateAllowedDeviation) { |
| 693 | set_survival_rate_trend(DECREASING); |
| 694 | } else if (survival_rate_diff < -kYoungSurvivalRateAllowedDeviation) { |
| 695 | set_survival_rate_trend(INCREASING); |
| 696 | } else { |
| 697 | set_survival_rate_trend(STABLE); |
| 698 | } |
| 699 | |
| 700 | survival_rate_ = survival_rate; |
| 701 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 702 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 703 | bool Heap::PerformGarbageCollection(GarbageCollector collector, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 704 | GCTracer* tracer) { |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 705 | bool next_gc_likely_to_collect_more = false; |
| 706 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 707 | if (collector != SCAVENGER) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 708 | PROFILE(isolate_, CodeMovingGCEvent()); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 709 | } |
| 710 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 711 | VerifySymbolTable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 712 | if (collector == MARK_COMPACTOR && global_gc_prologue_callback_) { |
| 713 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 714 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 715 | global_gc_prologue_callback_(); |
| 716 | } |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 717 | |
| 718 | GCType gc_type = |
| 719 | collector == MARK_COMPACTOR ? kGCTypeMarkSweepCompact : kGCTypeScavenge; |
| 720 | |
| 721 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 722 | if (gc_type & gc_prologue_callbacks_[i].gc_type) { |
| 723 | gc_prologue_callbacks_[i].callback(gc_type, kNoGCCallbackFlags); |
| 724 | } |
| 725 | } |
| 726 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 727 | EnsureFromSpaceIsCommitted(); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 728 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 729 | int start_new_space_size = Heap::new_space()->SizeAsInt(); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 730 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 731 | if (collector == MARK_COMPACTOR) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 732 | // Perform mark-sweep with optional compaction. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 733 | MarkCompact(tracer); |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 734 | sweep_generation_++; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 735 | bool high_survival_rate_during_scavenges = IsHighSurvivalRate() && |
| 736 | IsStableOrIncreasingSurvivalTrend(); |
| 737 | |
| 738 | UpdateSurvivalRateTrend(start_new_space_size); |
| 739 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 740 | intptr_t old_gen_size = PromotedSpaceSize(); |
| 741 | old_gen_promotion_limit_ = |
| 742 | old_gen_size + Max(kMinimumPromotionLimit, old_gen_size / 3); |
| 743 | old_gen_allocation_limit_ = |
| 744 | old_gen_size + Max(kMinimumAllocationLimit, old_gen_size / 2); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 745 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 746 | if (high_survival_rate_during_scavenges && |
| 747 | IsStableOrIncreasingSurvivalTrend()) { |
| 748 | // Stable high survival rates of young objects both during partial and |
| 749 | // full collection indicate that mutator is either building or modifying |
| 750 | // a structure with a long lifetime. |
| 751 | // In this case we aggressively raise old generation memory limits to |
| 752 | // postpone subsequent mark-sweep collection and thus trade memory |
| 753 | // space for the mutation speed. |
| 754 | old_gen_promotion_limit_ *= 2; |
| 755 | old_gen_allocation_limit_ *= 2; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 756 | } |
| 757 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 758 | old_gen_exhausted_ = false; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 759 | } else { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 760 | tracer_ = tracer; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 761 | Scavenge(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 762 | tracer_ = NULL; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 763 | |
| 764 | UpdateSurvivalRateTrend(start_new_space_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 765 | } |
ager@chromium.org | 439e85a | 2009-08-26 13:15:29 +0000 | [diff] [blame] | 766 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 767 | isolate_->counters()->objs_since_last_young()->Set(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 768 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 769 | gc_post_processing_depth_++; |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 770 | { DisableAssertNoAllocation allow_allocation; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 771 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 772 | next_gc_likely_to_collect_more = |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 773 | isolate_->global_handles()->PostGarbageCollectionProcessing(collector); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 774 | } |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 775 | gc_post_processing_depth_--; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 776 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 777 | // Update relocatables. |
| 778 | Relocatable::PostGarbageCollectionProcessing(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 779 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 780 | if (collector == MARK_COMPACTOR) { |
| 781 | // Register the amount of external allocated memory. |
| 782 | amount_of_external_allocated_memory_at_last_global_gc_ = |
| 783 | amount_of_external_allocated_memory_; |
| 784 | } |
| 785 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 786 | GCCallbackFlags callback_flags = tracer->is_compacting() |
| 787 | ? kGCCallbackFlagCompacted |
| 788 | : kNoGCCallbackFlags; |
| 789 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 790 | if (gc_type & gc_epilogue_callbacks_[i].gc_type) { |
| 791 | gc_epilogue_callbacks_[i].callback(gc_type, callback_flags); |
| 792 | } |
| 793 | } |
| 794 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 795 | if (collector == MARK_COMPACTOR && global_gc_epilogue_callback_) { |
| 796 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 797 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 798 | global_gc_epilogue_callback_(); |
| 799 | } |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 800 | VerifySymbolTable(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 801 | |
| 802 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 806 | void Heap::MarkCompact(GCTracer* tracer) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 807 | gc_state_ = MARK_COMPACT; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 808 | LOG(isolate_, ResourceEvent("markcompact", "begin")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 809 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 810 | mark_compact_collector_.Prepare(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 811 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 812 | bool is_compacting = mark_compact_collector_.IsCompacting(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 813 | |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 814 | if (is_compacting) { |
| 815 | mc_count_++; |
| 816 | } else { |
| 817 | ms_count_++; |
| 818 | } |
| 819 | tracer->set_full_gc_count(mc_count_ + ms_count_); |
| 820 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 821 | MarkCompactPrologue(is_compacting); |
| 822 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 823 | is_safe_to_read_maps_ = false; |
| 824 | mark_compact_collector_.CollectGarbage(); |
| 825 | is_safe_to_read_maps_ = true; |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 826 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 827 | LOG(isolate_, ResourceEvent("markcompact", "end")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 828 | |
| 829 | gc_state_ = NOT_IN_GC; |
| 830 | |
| 831 | Shrink(); |
| 832 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 833 | isolate_->counters()->objs_since_last_full()->Set(0); |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 834 | |
| 835 | contexts_disposed_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 839 | void Heap::MarkCompactPrologue(bool is_compacting) { |
| 840 | // At any old GC clear the keyed lookup cache to enable collection of unused |
| 841 | // maps. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 842 | isolate_->keyed_lookup_cache()->Clear(); |
| 843 | isolate_->context_slot_cache()->Clear(); |
| 844 | isolate_->descriptor_lookup_cache()->Clear(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 845 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 846 | isolate_->compilation_cache()->MarkCompactPrologue(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 847 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 848 | CompletelyClearInstanceofCache(); |
| 849 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 850 | if (is_compacting) FlushNumberStringCache(); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 851 | if (FLAG_cleanup_code_caches_at_gc) { |
| 852 | polymorphic_code_cache()->set_cache(undefined_value()); |
| 853 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 854 | |
| 855 | ClearNormalizedMapCaches(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 859 | Object* Heap::FindCodeObject(Address a) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 860 | Object* obj = NULL; // Initialization to please compiler. |
| 861 | { MaybeObject* maybe_obj = code_space_->FindObject(a); |
| 862 | if (!maybe_obj->ToObject(&obj)) { |
| 863 | obj = lo_space_->FindObject(a)->ToObjectUnchecked(); |
| 864 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 865 | } |
| 866 | return obj; |
| 867 | } |
| 868 | |
| 869 | |
| 870 | // Helper class for copying HeapObjects |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 871 | class ScavengeVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 872 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 873 | explicit ScavengeVisitor(Heap* heap) : heap_(heap) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 874 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 875 | void VisitPointer(Object** p) { ScavengePointer(p); } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 876 | |
| 877 | void VisitPointers(Object** start, Object** end) { |
| 878 | // Copy all HeapObject pointers in [start, end) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 879 | for (Object** p = start; p < end; p++) ScavengePointer(p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | private: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 883 | void ScavengePointer(Object** p) { |
| 884 | Object* object = *p; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 885 | if (!heap_->InNewSpace(object)) return; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 886 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 887 | reinterpret_cast<HeapObject*>(object)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 888 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 889 | |
| 890 | Heap* heap_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 891 | }; |
| 892 | |
| 893 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 894 | #ifdef DEBUG |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 895 | // 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] | 896 | // new space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 897 | class VerifyNonPointerSpacePointersVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 898 | public: |
| 899 | void VisitPointers(Object** start, Object**end) { |
| 900 | for (Object** current = start; current < end; current++) { |
| 901 | if ((*current)->IsHeapObject()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 902 | ASSERT(!HEAP->InNewSpace(HeapObject::cast(*current))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 903 | } |
| 904 | } |
| 905 | } |
| 906 | }; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 907 | |
| 908 | |
| 909 | static void VerifyNonPointerSpacePointers() { |
| 910 | // Verify that there are no pointers to new space in spaces where we |
| 911 | // do not expect them. |
| 912 | VerifyNonPointerSpacePointersVisitor v; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 913 | HeapObjectIterator code_it(HEAP->code_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 914 | for (HeapObject* object = code_it.next(); |
| 915 | object != NULL; object = code_it.next()) |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 916 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 917 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 918 | HeapObjectIterator data_it(HEAP->old_data_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 919 | for (HeapObject* object = data_it.next(); |
| 920 | object != NULL; object = data_it.next()) |
| 921 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 922 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 923 | #endif |
| 924 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 925 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 926 | void Heap::CheckNewSpaceExpansionCriteria() { |
| 927 | if (new_space_.Capacity() < new_space_.MaximumCapacity() && |
| 928 | survived_since_last_expansion_ > new_space_.Capacity()) { |
| 929 | // Grow the size of new space if there is room to grow and enough |
| 930 | // data has survived scavenge since the last expansion. |
| 931 | new_space_.Grow(); |
| 932 | survived_since_last_expansion_ = 0; |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 937 | static bool IsUnscavengedHeapObject(Heap* heap, Object** p) { |
| 938 | return heap->InNewSpace(*p) && |
| 939 | !HeapObject::cast(*p)->map_word().IsForwardingAddress(); |
| 940 | } |
| 941 | |
| 942 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 943 | void Heap::Scavenge() { |
| 944 | #ifdef DEBUG |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 945 | if (FLAG_enable_slow_asserts) VerifyNonPointerSpacePointers(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 946 | #endif |
| 947 | |
| 948 | gc_state_ = SCAVENGE; |
| 949 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 950 | SwitchScavengingVisitorsTableIfProfilingWasEnabled(); |
| 951 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 952 | Page::FlipMeaningOfInvalidatedWatermarkFlag(this); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 953 | #ifdef DEBUG |
| 954 | VerifyPageWatermarkValidity(old_pointer_space_, ALL_VALID); |
| 955 | VerifyPageWatermarkValidity(map_space_, ALL_VALID); |
| 956 | #endif |
| 957 | |
| 958 | // We do not update an allocation watermark of the top page during linear |
| 959 | // allocation to avoid overhead. So to maintain the watermark invariant |
| 960 | // we have to manually cache the watermark and mark the top page as having an |
| 961 | // invalid watermark. This guarantees that dirty regions iteration will use a |
| 962 | // correct watermark even if a linear allocation happens. |
| 963 | old_pointer_space_->FlushTopPageWatermark(); |
| 964 | map_space_->FlushTopPageWatermark(); |
| 965 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 966 | // Implements Cheney's copying algorithm |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 967 | LOG(isolate_, ResourceEvent("scavenge", "begin")); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 968 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 969 | // Clear descriptor cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 970 | isolate_->descriptor_lookup_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 971 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 972 | // Used for updating survived_since_last_expansion_ at function end. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 973 | intptr_t survived_watermark = PromotedSpaceSize(); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 974 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 975 | CheckNewSpaceExpansionCriteria(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 976 | |
| 977 | // Flip the semispaces. After flipping, to space is empty, from space has |
| 978 | // live objects. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 979 | new_space_.Flip(); |
| 980 | new_space_.ResetAllocationInfo(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 981 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 982 | // We need to sweep newly copied objects which can be either in the |
| 983 | // to space or promoted to the old generation. For to-space |
| 984 | // objects, we treat the bottom of the to space as a queue. Newly |
| 985 | // copied and unswept objects lie between a 'front' mark and the |
| 986 | // allocation pointer. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 987 | // |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 988 | // Promoted objects can go into various old-generation spaces, and |
| 989 | // can be allocated internally in the spaces (from the free list). |
| 990 | // We treat the top of the to space as a queue of addresses of |
| 991 | // promoted objects. The addresses of newly promoted and unswept |
| 992 | // objects lie between a 'front' mark and a 'rear' mark that is |
| 993 | // updated as a side effect of promoting an object. |
| 994 | // |
| 995 | // There is guaranteed to be enough room at the top of the to space |
| 996 | // for the addresses of promoted objects: every object promoted |
| 997 | // frees up its size in bytes from the top of the new space, and |
| 998 | // objects are at least one pointer in size. |
| 999 | Address new_space_front = new_space_.ToSpaceLow(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1000 | promotion_queue_.Initialize(new_space_.ToSpaceHigh()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1001 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1002 | is_safe_to_read_maps_ = false; |
| 1003 | ScavengeVisitor scavenge_visitor(this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1004 | // Copy roots. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1005 | IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1006 | |
| 1007 | // Copy objects reachable from the old generation. By definition, |
| 1008 | // there are no intergenerational pointers in code or data spaces. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1009 | IterateDirtyRegions(old_pointer_space_, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1010 | &Heap::IteratePointersInDirtyRegion, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1011 | &ScavengePointer, |
| 1012 | WATERMARK_CAN_BE_INVALID); |
| 1013 | |
| 1014 | IterateDirtyRegions(map_space_, |
| 1015 | &IteratePointersInDirtyMapsRegion, |
| 1016 | &ScavengePointer, |
| 1017 | WATERMARK_CAN_BE_INVALID); |
| 1018 | |
| 1019 | lo_space_->IterateDirtyRegions(&ScavengePointer); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1020 | |
| 1021 | // Copy objects reachable from cells by scavenging cell values directly. |
| 1022 | HeapObjectIterator cell_iterator(cell_space_); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1023 | for (HeapObject* cell = cell_iterator.next(); |
| 1024 | cell != NULL; cell = cell_iterator.next()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1025 | if (cell->IsJSGlobalPropertyCell()) { |
| 1026 | Address value_address = |
| 1027 | reinterpret_cast<Address>(cell) + |
| 1028 | (JSGlobalPropertyCell::kValueOffset - kHeapObjectTag); |
| 1029 | scavenge_visitor.VisitPointer(reinterpret_cast<Object**>(value_address)); |
| 1030 | } |
| 1031 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1032 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1033 | // Scavenge object reachable from the global contexts list directly. |
| 1034 | scavenge_visitor.VisitPointer(BitCast<Object**>(&global_contexts_list_)); |
| 1035 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1036 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1037 | isolate_->global_handles()->IdentifyNewSpaceWeakIndependentHandles( |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 1038 | &IsUnscavengedHeapObject); |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1039 | isolate_->global_handles()->IterateNewSpaceWeakIndependentRoots( |
| 1040 | &scavenge_visitor); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 1041 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
| 1042 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1043 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1044 | UpdateNewSpaceReferencesInExternalStringTable( |
| 1045 | &UpdateNewSpaceReferenceInExternalStringTableEntry); |
| 1046 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1047 | LiveObjectList::UpdateReferencesForScavengeGC(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1048 | isolate()->runtime_profiler()->UpdateSamplesAfterScavenge(); |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1049 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1050 | ASSERT(new_space_front == new_space_.top()); |
| 1051 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1052 | is_safe_to_read_maps_ = true; |
| 1053 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1054 | // Set age mark. |
| 1055 | new_space_.set_age_mark(new_space_.top()); |
| 1056 | |
| 1057 | // Update how much has survived scavenge. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 1058 | IncrementYoungSurvivorsCounter(static_cast<int>( |
| 1059 | (PromotedSpaceSize() - survived_watermark) + new_space_.Size())); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1060 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1061 | LOG(isolate_, ResourceEvent("scavenge", "end")); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1062 | |
| 1063 | gc_state_ = NOT_IN_GC; |
| 1064 | } |
| 1065 | |
| 1066 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1067 | String* Heap::UpdateNewSpaceReferenceInExternalStringTableEntry(Heap* heap, |
| 1068 | Object** p) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1069 | MapWord first_word = HeapObject::cast(*p)->map_word(); |
| 1070 | |
| 1071 | if (!first_word.IsForwardingAddress()) { |
| 1072 | // Unreachable external string can be finalized. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1073 | heap->FinalizeExternalString(String::cast(*p)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1074 | return NULL; |
| 1075 | } |
| 1076 | |
| 1077 | // String is still reachable. |
| 1078 | return String::cast(first_word.ToForwardingAddress()); |
| 1079 | } |
| 1080 | |
| 1081 | |
| 1082 | void Heap::UpdateNewSpaceReferencesInExternalStringTable( |
| 1083 | ExternalStringTableUpdaterCallback updater_func) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1084 | external_string_table_.Verify(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1085 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1086 | if (external_string_table_.new_space_strings_.is_empty()) return; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1087 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1088 | Object** start = &external_string_table_.new_space_strings_[0]; |
| 1089 | Object** end = start + external_string_table_.new_space_strings_.length(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1090 | Object** last = start; |
| 1091 | |
| 1092 | for (Object** p = start; p < end; ++p) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1093 | ASSERT(InFromSpace(*p)); |
| 1094 | String* target = updater_func(this, p); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1095 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1096 | if (target == NULL) continue; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1097 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1098 | ASSERT(target->IsExternalString()); |
| 1099 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1100 | if (InNewSpace(target)) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1101 | // String is still in new space. Update the table entry. |
| 1102 | *last = target; |
| 1103 | ++last; |
| 1104 | } else { |
| 1105 | // String got promoted. Move it to the old string list. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1106 | external_string_table_.AddOldString(target); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1107 | } |
| 1108 | } |
| 1109 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1110 | ASSERT(last <= end); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1111 | external_string_table_.ShrinkNewStrings(static_cast<int>(last - start)); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1115 | static Object* ProcessFunctionWeakReferences(Heap* heap, |
| 1116 | Object* function, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1117 | WeakObjectRetainer* retainer) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1118 | Object* head = heap->undefined_value(); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1119 | JSFunction* tail = NULL; |
| 1120 | Object* candidate = function; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1121 | while (candidate != heap->undefined_value()) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1122 | // Check whether to keep the candidate in the list. |
| 1123 | JSFunction* candidate_function = reinterpret_cast<JSFunction*>(candidate); |
| 1124 | Object* retain = retainer->RetainAs(candidate); |
| 1125 | if (retain != NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1126 | if (head == heap->undefined_value()) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1127 | // First element in the list. |
| 1128 | head = candidate_function; |
| 1129 | } else { |
| 1130 | // Subsequent elements in the list. |
| 1131 | ASSERT(tail != NULL); |
| 1132 | tail->set_next_function_link(candidate_function); |
| 1133 | } |
| 1134 | // Retained function is new tail. |
| 1135 | tail = candidate_function; |
| 1136 | } |
| 1137 | // Move to next element in the list. |
| 1138 | candidate = candidate_function->next_function_link(); |
| 1139 | } |
| 1140 | |
| 1141 | // Terminate the list if there is one or more elements. |
| 1142 | if (tail != NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1143 | tail->set_next_function_link(heap->undefined_value()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1144 | } |
| 1145 | |
| 1146 | return head; |
| 1147 | } |
| 1148 | |
| 1149 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1150 | void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) { |
| 1151 | Object* head = undefined_value(); |
| 1152 | Context* tail = NULL; |
| 1153 | Object* candidate = global_contexts_list_; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1154 | while (candidate != undefined_value()) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1155 | // Check whether to keep the candidate in the list. |
| 1156 | Context* candidate_context = reinterpret_cast<Context*>(candidate); |
| 1157 | Object* retain = retainer->RetainAs(candidate); |
| 1158 | if (retain != NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1159 | if (head == undefined_value()) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1160 | // First element in the list. |
| 1161 | head = candidate_context; |
| 1162 | } else { |
| 1163 | // Subsequent elements in the list. |
| 1164 | ASSERT(tail != NULL); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1165 | tail->set_unchecked(this, |
| 1166 | Context::NEXT_CONTEXT_LINK, |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1167 | candidate_context, |
| 1168 | UPDATE_WRITE_BARRIER); |
| 1169 | } |
| 1170 | // Retained context is new tail. |
| 1171 | tail = candidate_context; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1172 | |
| 1173 | // Process the weak list of optimized functions for the context. |
| 1174 | Object* function_list_head = |
| 1175 | ProcessFunctionWeakReferences( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1176 | this, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1177 | candidate_context->get(Context::OPTIMIZED_FUNCTIONS_LIST), |
| 1178 | retainer); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1179 | candidate_context->set_unchecked(this, |
| 1180 | Context::OPTIMIZED_FUNCTIONS_LIST, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1181 | function_list_head, |
| 1182 | UPDATE_WRITE_BARRIER); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1183 | } |
| 1184 | // Move to next element in the list. |
| 1185 | candidate = candidate_context->get(Context::NEXT_CONTEXT_LINK); |
| 1186 | } |
| 1187 | |
| 1188 | // Terminate the list if there is one or more elements. |
| 1189 | if (tail != NULL) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1190 | tail->set_unchecked(this, |
| 1191 | Context::NEXT_CONTEXT_LINK, |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1192 | Heap::undefined_value(), |
| 1193 | UPDATE_WRITE_BARRIER); |
| 1194 | } |
| 1195 | |
| 1196 | // Update the head of the list of contexts. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1197 | global_contexts_list_ = head; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1201 | class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> { |
| 1202 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1203 | static inline void VisitPointer(Heap* heap, Object** p) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1204 | Object* object = *p; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1205 | if (!heap->InNewSpace(object)) return; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1206 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 1207 | reinterpret_cast<HeapObject*>(object)); |
| 1208 | } |
| 1209 | }; |
| 1210 | |
| 1211 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1212 | Address Heap::DoScavenge(ObjectVisitor* scavenge_visitor, |
| 1213 | Address new_space_front) { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1214 | do { |
| 1215 | ASSERT(new_space_front <= new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1216 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1217 | // The addresses new_space_front and new_space_.top() define a |
| 1218 | // queue of unprocessed copied objects. Process them until the |
| 1219 | // queue is empty. |
| 1220 | while (new_space_front < new_space_.top()) { |
| 1221 | HeapObject* object = HeapObject::FromAddress(new_space_front); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1222 | new_space_front += NewSpaceScavenger::IterateBody(object->map(), object); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1223 | } |
| 1224 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1225 | // Promote and process all the to-be-promoted objects. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1226 | while (!promotion_queue_.is_empty()) { |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1227 | HeapObject* target; |
| 1228 | int size; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1229 | promotion_queue_.remove(&target, &size); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1230 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1231 | // Promoted object might be already partially visited |
| 1232 | // during dirty regions iteration. Thus we search specificly |
| 1233 | // for pointers to from semispace instead of looking for pointers |
| 1234 | // to new space. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1235 | ASSERT(!target->IsMap()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1236 | IterateAndMarkPointersToFromSpace(target->address(), |
| 1237 | target->address() + size, |
| 1238 | &ScavengePointer); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1239 | } |
| 1240 | |
| 1241 | // Take another spin if there are now unswept objects in new space |
| 1242 | // (there are currently no more unswept promoted objects). |
| 1243 | } while (new_space_front < new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1244 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1245 | return new_space_front; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1246 | } |
| 1247 | |
| 1248 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1249 | enum LoggingAndProfiling { |
| 1250 | LOGGING_AND_PROFILING_ENABLED, |
| 1251 | LOGGING_AND_PROFILING_DISABLED |
| 1252 | }; |
| 1253 | |
| 1254 | |
| 1255 | typedef void (*ScavengingCallback)(Map* map, |
| 1256 | HeapObject** slot, |
| 1257 | HeapObject* object); |
| 1258 | |
| 1259 | |
| 1260 | static Atomic32 scavenging_visitors_table_mode_; |
| 1261 | static VisitorDispatchTable<ScavengingCallback> scavenging_visitors_table_; |
| 1262 | |
| 1263 | |
| 1264 | INLINE(static void DoScavengeObject(Map* map, |
| 1265 | HeapObject** slot, |
| 1266 | HeapObject* obj)); |
| 1267 | |
| 1268 | |
| 1269 | void DoScavengeObject(Map* map, HeapObject** slot, HeapObject* obj) { |
| 1270 | scavenging_visitors_table_.GetVisitor(map)(map, slot, obj); |
| 1271 | } |
| 1272 | |
| 1273 | |
| 1274 | template<LoggingAndProfiling logging_and_profiling_mode> |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1275 | class ScavengingVisitor : public StaticVisitorBase { |
| 1276 | public: |
| 1277 | static void Initialize() { |
| 1278 | table_.Register(kVisitSeqAsciiString, &EvacuateSeqAsciiString); |
| 1279 | table_.Register(kVisitSeqTwoByteString, &EvacuateSeqTwoByteString); |
| 1280 | table_.Register(kVisitShortcutCandidate, &EvacuateShortcutCandidate); |
| 1281 | table_.Register(kVisitByteArray, &EvacuateByteArray); |
| 1282 | table_.Register(kVisitFixedArray, &EvacuateFixedArray); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1283 | table_.Register(kVisitFixedDoubleArray, &EvacuateFixedDoubleArray); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1284 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1285 | table_.Register(kVisitGlobalContext, |
| 1286 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1287 | template VisitSpecialized<Context::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1288 | |
| 1289 | table_.Register(kVisitConsString, |
| 1290 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1291 | template VisitSpecialized<ConsString::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1292 | |
| 1293 | table_.Register(kVisitSharedFunctionInfo, |
| 1294 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1295 | template VisitSpecialized<SharedFunctionInfo::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1296 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 1297 | table_.Register(kVisitJSWeakMap, |
| 1298 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1299 | Visit); |
| 1300 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 1301 | table_.Register(kVisitJSRegExp, |
| 1302 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1303 | Visit); |
| 1304 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1305 | table_.Register(kVisitJSFunction, |
| 1306 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1307 | template VisitSpecialized<JSFunction::kSize>); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1308 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1309 | table_.RegisterSpecializations<ObjectEvacuationStrategy<DATA_OBJECT>, |
| 1310 | kVisitDataObject, |
| 1311 | kVisitDataObjectGeneric>(); |
| 1312 | |
| 1313 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1314 | kVisitJSObject, |
| 1315 | kVisitJSObjectGeneric>(); |
| 1316 | |
| 1317 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1318 | kVisitStruct, |
| 1319 | kVisitStructGeneric>(); |
| 1320 | } |
| 1321 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1322 | static VisitorDispatchTable<ScavengingCallback>* GetTable() { |
| 1323 | return &table_; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1324 | } |
| 1325 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1326 | private: |
| 1327 | enum ObjectContents { DATA_OBJECT, POINTER_OBJECT }; |
| 1328 | enum SizeRestriction { SMALL, UNKNOWN_SIZE }; |
| 1329 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1330 | static void RecordCopiedObject(Heap* heap, HeapObject* obj) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1331 | bool should_record = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1332 | #ifdef DEBUG |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1333 | should_record = FLAG_heap_stats; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1334 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1335 | should_record = should_record || FLAG_log_gc; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1336 | if (should_record) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1337 | if (heap->new_space()->Contains(obj)) { |
| 1338 | heap->new_space()->RecordAllocation(obj); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1339 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1340 | heap->new_space()->RecordPromotion(obj); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1341 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1342 | } |
| 1343 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1344 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1345 | // Helper function used by CopyObject to copy a source object to an |
| 1346 | // allocated target object and update the forwarding pointer in the source |
| 1347 | // object. Returns the target object. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1348 | INLINE(static HeapObject* MigrateObject(Heap* heap, |
| 1349 | HeapObject* source, |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1350 | HeapObject* target, |
| 1351 | int size)) { |
| 1352 | // Copy the content of source to target. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1353 | heap->CopyBlock(target->address(), source->address(), size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1354 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1355 | // Set the forwarding address. |
| 1356 | source->set_map_word(MapWord::FromForwardingAddress(target)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1357 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1358 | if (logging_and_profiling_mode == LOGGING_AND_PROFILING_ENABLED) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1359 | // Update NewSpace stats if necessary. |
| 1360 | RecordCopiedObject(heap, target); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1361 | HEAP_PROFILE(heap, ObjectMoveEvent(source->address(), target->address())); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1362 | Isolate* isolate = heap->isolate(); |
| 1363 | if (isolate->logger()->is_logging() || |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1364 | CpuProfiler::is_profiling(isolate)) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1365 | if (target->IsSharedFunctionInfo()) { |
| 1366 | PROFILE(isolate, SharedFunctionInfoMoveEvent( |
| 1367 | source->address(), target->address())); |
| 1368 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 1369 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1370 | } |
| 1371 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1372 | return target; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1373 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1374 | |
| 1375 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1376 | template<ObjectContents object_contents, SizeRestriction size_restriction> |
| 1377 | static inline void EvacuateObject(Map* map, |
| 1378 | HeapObject** slot, |
| 1379 | HeapObject* object, |
| 1380 | int object_size) { |
| 1381 | ASSERT((size_restriction != SMALL) || |
| 1382 | (object_size <= Page::kMaxHeapObjectSize)); |
| 1383 | ASSERT(object->Size() == object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1384 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1385 | Heap* heap = map->heap(); |
| 1386 | if (heap->ShouldBePromoted(object->address(), object_size)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1387 | MaybeObject* maybe_result; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1388 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1389 | if ((size_restriction != SMALL) && |
| 1390 | (object_size > Page::kMaxHeapObjectSize)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1391 | maybe_result = heap->lo_space()->AllocateRawFixedArray(object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1392 | } else { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1393 | if (object_contents == DATA_OBJECT) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1394 | maybe_result = heap->old_data_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1395 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1396 | maybe_result = heap->old_pointer_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1397 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1398 | } |
| 1399 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1400 | Object* result = NULL; // Initialization to please compiler. |
| 1401 | if (maybe_result->ToObject(&result)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1402 | HeapObject* target = HeapObject::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1403 | *slot = MigrateObject(heap, object , target, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1404 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1405 | if (object_contents == POINTER_OBJECT) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1406 | heap->promotion_queue()->insert(target, object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1407 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1408 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1409 | heap->tracer()->increment_promoted_objects_size(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1410 | return; |
| 1411 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1412 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1413 | Object* result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1414 | heap->new_space()->AllocateRaw(object_size)->ToObjectUnchecked(); |
| 1415 | *slot = MigrateObject(heap, object, HeapObject::cast(result), object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1416 | return; |
| 1417 | } |
| 1418 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1419 | |
| 1420 | static inline void EvacuateFixedArray(Map* map, |
| 1421 | HeapObject** slot, |
| 1422 | HeapObject* object) { |
| 1423 | int object_size = FixedArray::BodyDescriptor::SizeOf(map, object); |
| 1424 | EvacuateObject<POINTER_OBJECT, UNKNOWN_SIZE>(map, |
| 1425 | slot, |
| 1426 | object, |
| 1427 | object_size); |
| 1428 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1429 | |
| 1430 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1431 | static inline void EvacuateFixedDoubleArray(Map* map, |
| 1432 | HeapObject** slot, |
| 1433 | HeapObject* object) { |
| 1434 | int length = reinterpret_cast<FixedDoubleArray*>(object)->length(); |
| 1435 | int object_size = FixedDoubleArray::SizeFor(length); |
| 1436 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, |
| 1437 | slot, |
| 1438 | object, |
| 1439 | object_size); |
| 1440 | } |
| 1441 | |
| 1442 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1443 | static inline void EvacuateByteArray(Map* map, |
| 1444 | HeapObject** slot, |
| 1445 | HeapObject* object) { |
| 1446 | int object_size = reinterpret_cast<ByteArray*>(object)->ByteArraySize(); |
| 1447 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1448 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1449 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1450 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1451 | static inline void EvacuateSeqAsciiString(Map* map, |
| 1452 | HeapObject** slot, |
| 1453 | HeapObject* object) { |
| 1454 | int object_size = SeqAsciiString::cast(object)-> |
| 1455 | SeqAsciiStringSize(map->instance_type()); |
| 1456 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1457 | } |
| 1458 | |
| 1459 | |
| 1460 | static inline void EvacuateSeqTwoByteString(Map* map, |
| 1461 | HeapObject** slot, |
| 1462 | HeapObject* object) { |
| 1463 | int object_size = SeqTwoByteString::cast(object)-> |
| 1464 | SeqTwoByteStringSize(map->instance_type()); |
| 1465 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1466 | } |
| 1467 | |
| 1468 | |
| 1469 | static inline bool IsShortcutCandidate(int type) { |
| 1470 | return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| 1471 | } |
| 1472 | |
| 1473 | static inline void EvacuateShortcutCandidate(Map* map, |
| 1474 | HeapObject** slot, |
| 1475 | HeapObject* object) { |
| 1476 | ASSERT(IsShortcutCandidate(map->instance_type())); |
| 1477 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1478 | if (ConsString::cast(object)->unchecked_second() == |
| 1479 | map->heap()->empty_string()) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1480 | HeapObject* first = |
| 1481 | HeapObject::cast(ConsString::cast(object)->unchecked_first()); |
| 1482 | |
| 1483 | *slot = first; |
| 1484 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1485 | if (!map->heap()->InNewSpace(first)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1486 | object->set_map_word(MapWord::FromForwardingAddress(first)); |
| 1487 | return; |
| 1488 | } |
| 1489 | |
| 1490 | MapWord first_word = first->map_word(); |
| 1491 | if (first_word.IsForwardingAddress()) { |
| 1492 | HeapObject* target = first_word.ToForwardingAddress(); |
| 1493 | |
| 1494 | *slot = target; |
| 1495 | object->set_map_word(MapWord::FromForwardingAddress(target)); |
| 1496 | return; |
| 1497 | } |
| 1498 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1499 | DoScavengeObject(first->map(), slot, first); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1500 | object->set_map_word(MapWord::FromForwardingAddress(*slot)); |
| 1501 | return; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1502 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1503 | |
| 1504 | int object_size = ConsString::kSize; |
| 1505 | EvacuateObject<POINTER_OBJECT, SMALL>(map, slot, object, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1506 | } |
| 1507 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1508 | template<ObjectContents object_contents> |
| 1509 | class ObjectEvacuationStrategy { |
| 1510 | public: |
| 1511 | template<int object_size> |
| 1512 | static inline void VisitSpecialized(Map* map, |
| 1513 | HeapObject** slot, |
| 1514 | HeapObject* object) { |
| 1515 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1516 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1517 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1518 | static inline void Visit(Map* map, |
| 1519 | HeapObject** slot, |
| 1520 | HeapObject* object) { |
| 1521 | int object_size = map->instance_size(); |
| 1522 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1523 | } |
| 1524 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1525 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1526 | static VisitorDispatchTable<ScavengingCallback> table_; |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1527 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1528 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1529 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1530 | template<LoggingAndProfiling logging_and_profiling_mode> |
| 1531 | VisitorDispatchTable<ScavengingCallback> |
| 1532 | ScavengingVisitor<logging_and_profiling_mode>::table_; |
| 1533 | |
| 1534 | |
| 1535 | static void InitializeScavengingVisitorsTables() { |
| 1536 | ScavengingVisitor<LOGGING_AND_PROFILING_DISABLED>::Initialize(); |
| 1537 | ScavengingVisitor<LOGGING_AND_PROFILING_ENABLED>::Initialize(); |
| 1538 | scavenging_visitors_table_.CopyFrom( |
| 1539 | ScavengingVisitor<LOGGING_AND_PROFILING_DISABLED>::GetTable()); |
| 1540 | scavenging_visitors_table_mode_ = LOGGING_AND_PROFILING_DISABLED; |
| 1541 | } |
| 1542 | |
| 1543 | |
| 1544 | void Heap::SwitchScavengingVisitorsTableIfProfilingWasEnabled() { |
| 1545 | if (scavenging_visitors_table_mode_ == LOGGING_AND_PROFILING_ENABLED) { |
| 1546 | // Table was already updated by some isolate. |
| 1547 | return; |
| 1548 | } |
| 1549 | |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1550 | if (isolate()->logger()->is_logging() | |
| 1551 | CpuProfiler::is_profiling(isolate()) || |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1552 | (isolate()->heap_profiler() != NULL && |
| 1553 | isolate()->heap_profiler()->is_profiling())) { |
| 1554 | // If one of the isolates is doing scavenge at this moment of time |
| 1555 | // it might see this table in an inconsitent state when |
| 1556 | // some of the callbacks point to |
| 1557 | // ScavengingVisitor<LOGGING_AND_PROFILING_ENABLED> and others |
| 1558 | // to ScavengingVisitor<LOGGING_AND_PROFILING_DISABLED>. |
| 1559 | // However this does not lead to any bugs as such isolate does not have |
| 1560 | // profiling enabled and any isolate with enabled profiling is guaranteed |
| 1561 | // to see the table in the consistent state. |
| 1562 | scavenging_visitors_table_.CopyFrom( |
| 1563 | ScavengingVisitor<LOGGING_AND_PROFILING_ENABLED>::GetTable()); |
| 1564 | |
| 1565 | // We use Release_Store to prevent reordering of this write before writes |
| 1566 | // to the table. |
| 1567 | Release_Store(&scavenging_visitors_table_mode_, |
| 1568 | LOGGING_AND_PROFILING_ENABLED); |
| 1569 | } |
| 1570 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1571 | |
| 1572 | |
| 1573 | void Heap::ScavengeObjectSlow(HeapObject** p, HeapObject* object) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1574 | ASSERT(HEAP->InFromSpace(object)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1575 | MapWord first_word = object->map_word(); |
| 1576 | ASSERT(!first_word.IsForwardingAddress()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1577 | Map* map = first_word.ToMap(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1578 | DoScavengeObject(map, p, object); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1579 | } |
| 1580 | |
| 1581 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1582 | MaybeObject* Heap::AllocatePartialMap(InstanceType instance_type, |
| 1583 | int instance_size) { |
| 1584 | Object* result; |
| 1585 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1586 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1587 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1588 | |
| 1589 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1590 | reinterpret_cast<Map*>(result)->set_map(raw_unchecked_meta_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1591 | reinterpret_cast<Map*>(result)->set_instance_type(instance_type); |
| 1592 | reinterpret_cast<Map*>(result)->set_instance_size(instance_size); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1593 | reinterpret_cast<Map*>(result)->set_visitor_id( |
| 1594 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1595 | reinterpret_cast<Map*>(result)->set_inobject_properties(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1596 | reinterpret_cast<Map*>(result)->set_pre_allocated_property_fields(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1597 | reinterpret_cast<Map*>(result)->set_unused_property_fields(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1598 | reinterpret_cast<Map*>(result)->set_bit_field(0); |
| 1599 | reinterpret_cast<Map*>(result)->set_bit_field2(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1600 | return result; |
| 1601 | } |
| 1602 | |
| 1603 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1604 | MaybeObject* Heap::AllocateMap(InstanceType instance_type, int instance_size) { |
| 1605 | Object* result; |
| 1606 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1607 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1608 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1609 | |
| 1610 | Map* map = reinterpret_cast<Map*>(result); |
| 1611 | map->set_map(meta_map()); |
| 1612 | map->set_instance_type(instance_type); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1613 | map->set_visitor_id( |
| 1614 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1615 | map->set_prototype(null_value()); |
| 1616 | map->set_constructor(null_value()); |
| 1617 | map->set_instance_size(instance_size); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1618 | map->set_inobject_properties(0); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1619 | map->set_pre_allocated_property_fields(0); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1620 | map->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1621 | map->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1622 | map->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1623 | map->set_unused_property_fields(0); |
| 1624 | map->set_bit_field(0); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1625 | map->set_bit_field2(1 << Map::kIsExtensible); |
| 1626 | map->set_elements_kind(JSObject::FAST_ELEMENTS); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 1627 | |
| 1628 | // If the map object is aligned fill the padding area with Smi 0 objects. |
| 1629 | if (Map::kPadStart < Map::kSize) { |
| 1630 | memset(reinterpret_cast<byte*>(map) + Map::kPadStart - kHeapObjectTag, |
| 1631 | 0, |
| 1632 | Map::kSize - Map::kPadStart); |
| 1633 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1634 | return map; |
| 1635 | } |
| 1636 | |
| 1637 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1638 | MaybeObject* Heap::AllocateCodeCache() { |
| 1639 | Object* result; |
| 1640 | { MaybeObject* maybe_result = AllocateStruct(CODE_CACHE_TYPE); |
| 1641 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1642 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1643 | CodeCache* code_cache = CodeCache::cast(result); |
| 1644 | code_cache->set_default_cache(empty_fixed_array()); |
| 1645 | code_cache->set_normal_type_cache(undefined_value()); |
| 1646 | return code_cache; |
| 1647 | } |
| 1648 | |
| 1649 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1650 | MaybeObject* Heap::AllocatePolymorphicCodeCache() { |
| 1651 | return AllocateStruct(POLYMORPHIC_CODE_CACHE_TYPE); |
| 1652 | } |
| 1653 | |
| 1654 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1655 | const Heap::StringTypeTable Heap::string_type_table[] = { |
| 1656 | #define STRING_TYPE_ELEMENT(type, size, name, camel_name) \ |
| 1657 | {type, size, k##camel_name##MapRootIndex}, |
| 1658 | STRING_TYPE_LIST(STRING_TYPE_ELEMENT) |
| 1659 | #undef STRING_TYPE_ELEMENT |
| 1660 | }; |
| 1661 | |
| 1662 | |
| 1663 | const Heap::ConstantSymbolTable Heap::constant_symbol_table[] = { |
| 1664 | #define CONSTANT_SYMBOL_ELEMENT(name, contents) \ |
| 1665 | {contents, k##name##RootIndex}, |
| 1666 | SYMBOL_LIST(CONSTANT_SYMBOL_ELEMENT) |
| 1667 | #undef CONSTANT_SYMBOL_ELEMENT |
| 1668 | }; |
| 1669 | |
| 1670 | |
| 1671 | const Heap::StructTable Heap::struct_table[] = { |
| 1672 | #define STRUCT_TABLE_ELEMENT(NAME, Name, name) \ |
| 1673 | { NAME##_TYPE, Name::kSize, k##Name##MapRootIndex }, |
| 1674 | STRUCT_LIST(STRUCT_TABLE_ELEMENT) |
| 1675 | #undef STRUCT_TABLE_ELEMENT |
| 1676 | }; |
| 1677 | |
| 1678 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1679 | bool Heap::CreateInitialMaps() { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1680 | Object* obj; |
| 1681 | { MaybeObject* maybe_obj = AllocatePartialMap(MAP_TYPE, Map::kSize); |
| 1682 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1683 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1684 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1685 | Map* new_meta_map = reinterpret_cast<Map*>(obj); |
| 1686 | set_meta_map(new_meta_map); |
| 1687 | new_meta_map->set_map(new_meta_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1688 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1689 | { MaybeObject* maybe_obj = |
| 1690 | AllocatePartialMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1691 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1692 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1693 | set_fixed_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1694 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1695 | { MaybeObject* maybe_obj = AllocatePartialMap(ODDBALL_TYPE, Oddball::kSize); |
| 1696 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1697 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1698 | set_oddball_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1699 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 1700 | // Allocate the empty array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1701 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1702 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1703 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1704 | set_empty_fixed_array(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1705 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1706 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_DATA_SPACE); |
| 1707 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1708 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1709 | set_null_value(obj); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1710 | Oddball::cast(obj)->set_kind(Oddball::kNull); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1711 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1712 | // Allocate the empty descriptor array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1713 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1714 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1715 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1716 | set_empty_descriptor_array(DescriptorArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1717 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1718 | // Fix the instance_descriptors for the existing maps. |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1719 | meta_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1720 | meta_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1721 | meta_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1722 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1723 | fixed_array_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1724 | fixed_array_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1725 | fixed_array_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1726 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1727 | oddball_map()->init_instance_descriptors(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1728 | oddball_map()->set_code_cache(empty_fixed_array()); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1729 | oddball_map()->set_prototype_transitions(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1730 | |
| 1731 | // Fix prototype object for existing maps. |
| 1732 | meta_map()->set_prototype(null_value()); |
| 1733 | meta_map()->set_constructor(null_value()); |
| 1734 | |
| 1735 | fixed_array_map()->set_prototype(null_value()); |
| 1736 | fixed_array_map()->set_constructor(null_value()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1737 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1738 | oddball_map()->set_prototype(null_value()); |
| 1739 | oddball_map()->set_constructor(null_value()); |
| 1740 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1741 | { MaybeObject* maybe_obj = |
| 1742 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1743 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1744 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1745 | set_fixed_cow_array_map(Map::cast(obj)); |
| 1746 | ASSERT(fixed_array_map() != fixed_cow_array_map()); |
| 1747 | |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame^] | 1748 | { MaybeObject* maybe_obj = |
| 1749 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1750 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1751 | } |
| 1752 | set_serialized_scope_info_map(Map::cast(obj)); |
| 1753 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1754 | { MaybeObject* maybe_obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize); |
| 1755 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1756 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1757 | set_heap_number_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1758 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 1759 | { MaybeObject* maybe_obj = AllocateMap(FOREIGN_TYPE, Foreign::kSize); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1760 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1761 | } |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 1762 | set_foreign_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1763 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1764 | for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) { |
| 1765 | const StringTypeTable& entry = string_type_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1766 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 1767 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1768 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1769 | roots_[entry.index] = Map::cast(obj); |
| 1770 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1771 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1772 | { MaybeObject* maybe_obj = AllocateMap(STRING_TYPE, kVariableSizeSentinel); |
| 1773 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1774 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1775 | set_undetectable_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1776 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1777 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1778 | { MaybeObject* maybe_obj = |
| 1779 | AllocateMap(ASCII_STRING_TYPE, kVariableSizeSentinel); |
| 1780 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1781 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1782 | set_undetectable_ascii_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1783 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1784 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1785 | { MaybeObject* maybe_obj = |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1786 | AllocateMap(FIXED_DOUBLE_ARRAY_TYPE, kVariableSizeSentinel); |
| 1787 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1788 | } |
| 1789 | set_fixed_double_array_map(Map::cast(obj)); |
| 1790 | |
| 1791 | { MaybeObject* maybe_obj = |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1792 | AllocateMap(BYTE_ARRAY_TYPE, kVariableSizeSentinel); |
| 1793 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1794 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1795 | set_byte_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1796 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1797 | { MaybeObject* maybe_obj = AllocateByteArray(0, TENURED); |
| 1798 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1799 | } |
| 1800 | set_empty_byte_array(ByteArray::cast(obj)); |
| 1801 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1802 | { MaybeObject* maybe_obj = |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 1803 | AllocateMap(EXTERNAL_PIXEL_ARRAY_TYPE, ExternalArray::kAlignedSize); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1804 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1805 | } |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 1806 | set_external_pixel_array_map(Map::cast(obj)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1807 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1808 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_BYTE_ARRAY_TYPE, |
| 1809 | ExternalArray::kAlignedSize); |
| 1810 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1811 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1812 | set_external_byte_array_map(Map::cast(obj)); |
| 1813 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1814 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE, |
| 1815 | ExternalArray::kAlignedSize); |
| 1816 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1817 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1818 | set_external_unsigned_byte_array_map(Map::cast(obj)); |
| 1819 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1820 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_SHORT_ARRAY_TYPE, |
| 1821 | ExternalArray::kAlignedSize); |
| 1822 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1823 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1824 | set_external_short_array_map(Map::cast(obj)); |
| 1825 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1826 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE, |
| 1827 | ExternalArray::kAlignedSize); |
| 1828 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1829 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1830 | set_external_unsigned_short_array_map(Map::cast(obj)); |
| 1831 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1832 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_INT_ARRAY_TYPE, |
| 1833 | ExternalArray::kAlignedSize); |
| 1834 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1835 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1836 | set_external_int_array_map(Map::cast(obj)); |
| 1837 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1838 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_INT_ARRAY_TYPE, |
| 1839 | ExternalArray::kAlignedSize); |
| 1840 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1841 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1842 | set_external_unsigned_int_array_map(Map::cast(obj)); |
| 1843 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1844 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_FLOAT_ARRAY_TYPE, |
| 1845 | ExternalArray::kAlignedSize); |
| 1846 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1847 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1848 | set_external_float_array_map(Map::cast(obj)); |
| 1849 | |
whesse@chromium.org | 7b26015 | 2011-06-20 15:33:18 +0000 | [diff] [blame] | 1850 | { MaybeObject* maybe_obj = |
| 1851 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1852 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1853 | } |
| 1854 | set_non_strict_arguments_elements_map(Map::cast(obj)); |
| 1855 | |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1856 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_DOUBLE_ARRAY_TYPE, |
| 1857 | ExternalArray::kAlignedSize); |
| 1858 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1859 | } |
| 1860 | set_external_double_array_map(Map::cast(obj)); |
| 1861 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1862 | { MaybeObject* maybe_obj = AllocateMap(CODE_TYPE, kVariableSizeSentinel); |
| 1863 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1864 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1865 | set_code_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1866 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1867 | { MaybeObject* maybe_obj = AllocateMap(JS_GLOBAL_PROPERTY_CELL_TYPE, |
| 1868 | JSGlobalPropertyCell::kSize); |
| 1869 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1870 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1871 | set_global_property_cell_map(Map::cast(obj)); |
| 1872 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1873 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, kPointerSize); |
| 1874 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1875 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1876 | set_one_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1877 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1878 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, 2 * kPointerSize); |
| 1879 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1880 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1881 | set_two_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1882 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1883 | for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) { |
| 1884 | const StructTable& entry = struct_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1885 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 1886 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1887 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1888 | roots_[entry.index] = Map::cast(obj); |
| 1889 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1890 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1891 | { MaybeObject* maybe_obj = |
| 1892 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1893 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1894 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1895 | set_hash_table_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1896 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1897 | { MaybeObject* maybe_obj = |
| 1898 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1899 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1900 | } |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1901 | set_function_context_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1902 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1903 | { MaybeObject* maybe_obj = |
| 1904 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1905 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1906 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1907 | set_catch_context_map(Map::cast(obj)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1908 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1909 | { MaybeObject* maybe_obj = |
| 1910 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1911 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1912 | } |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 1913 | set_with_context_map(Map::cast(obj)); |
| 1914 | |
| 1915 | { MaybeObject* maybe_obj = |
| 1916 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1917 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1918 | } |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame^] | 1919 | set_block_context_map(Map::cast(obj)); |
| 1920 | |
| 1921 | { MaybeObject* maybe_obj = |
| 1922 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1923 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1924 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1925 | Map* global_context_map = Map::cast(obj); |
| 1926 | global_context_map->set_visitor_id(StaticVisitorBase::kVisitGlobalContext); |
| 1927 | set_global_context_map(global_context_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1928 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1929 | { MaybeObject* maybe_obj = AllocateMap(SHARED_FUNCTION_INFO_TYPE, |
| 1930 | SharedFunctionInfo::kAlignedSize); |
| 1931 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1932 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1933 | set_shared_function_info_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1934 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 1935 | { MaybeObject* maybe_obj = AllocateMap(JS_MESSAGE_OBJECT_TYPE, |
| 1936 | JSMessageObject::kSize); |
| 1937 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1938 | } |
| 1939 | set_message_object_map(Map::cast(obj)); |
| 1940 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1941 | ASSERT(!InNewSpace(empty_fixed_array())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1942 | return true; |
| 1943 | } |
| 1944 | |
| 1945 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1946 | MaybeObject* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1947 | // Statically ensure that it is safe to allocate heap numbers in paged |
| 1948 | // spaces. |
| 1949 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1950 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1951 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1952 | Object* result; |
| 1953 | { MaybeObject* maybe_result = |
| 1954 | AllocateRaw(HeapNumber::kSize, space, OLD_DATA_SPACE); |
| 1955 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1956 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1957 | |
| 1958 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 1959 | HeapNumber::cast(result)->set_value(value); |
| 1960 | return result; |
| 1961 | } |
| 1962 | |
| 1963 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1964 | MaybeObject* Heap::AllocateHeapNumber(double value) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1965 | // Use general version, if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1966 | if (always_allocate()) return AllocateHeapNumber(value, TENURED); |
| 1967 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1968 | // This version of AllocateHeapNumber is optimized for |
| 1969 | // allocation in new space. |
| 1970 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
| 1971 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1972 | Object* result; |
| 1973 | { MaybeObject* maybe_result = new_space_.AllocateRaw(HeapNumber::kSize); |
| 1974 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1975 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1976 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 1977 | HeapNumber::cast(result)->set_value(value); |
| 1978 | return result; |
| 1979 | } |
| 1980 | |
| 1981 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1982 | MaybeObject* Heap::AllocateJSGlobalPropertyCell(Object* value) { |
| 1983 | Object* result; |
| 1984 | { MaybeObject* maybe_result = AllocateRawCell(); |
| 1985 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1986 | } |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1987 | HeapObject::cast(result)->set_map(global_property_cell_map()); |
| 1988 | JSGlobalPropertyCell::cast(result)->set_value(value); |
| 1989 | return result; |
| 1990 | } |
| 1991 | |
| 1992 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1993 | MaybeObject* Heap::CreateOddball(const char* to_string, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1994 | Object* to_number, |
| 1995 | byte kind) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1996 | Object* result; |
| 1997 | { MaybeObject* maybe_result = Allocate(oddball_map(), OLD_DATA_SPACE); |
| 1998 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1999 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2000 | return Oddball::cast(result)->Initialize(to_string, to_number, kind); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2001 | } |
| 2002 | |
| 2003 | |
| 2004 | bool Heap::CreateApiObjects() { |
| 2005 | Object* obj; |
| 2006 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2007 | { MaybeObject* maybe_obj = AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| 2008 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2009 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2010 | set_neander_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2011 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2012 | { MaybeObject* maybe_obj = AllocateJSObjectFromMap(neander_map()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2013 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2014 | } |
| 2015 | Object* elements; |
| 2016 | { MaybeObject* maybe_elements = AllocateFixedArray(2); |
| 2017 | if (!maybe_elements->ToObject(&elements)) return false; |
| 2018 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2019 | FixedArray::cast(elements)->set(0, Smi::FromInt(0)); |
| 2020 | JSObject::cast(obj)->set_elements(FixedArray::cast(elements)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2021 | set_message_listeners(JSObject::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2022 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2023 | return true; |
| 2024 | } |
| 2025 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2026 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2027 | void Heap::CreateJSEntryStub() { |
| 2028 | JSEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2029 | set_js_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2030 | } |
| 2031 | |
| 2032 | |
| 2033 | void Heap::CreateJSConstructEntryStub() { |
| 2034 | JSConstructEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2035 | set_js_construct_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2036 | } |
| 2037 | |
| 2038 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2039 | void Heap::CreateFixedStubs() { |
| 2040 | // Here we create roots for fixed stubs. They are needed at GC |
| 2041 | // for cooking and uncooking (check out frames.cc). |
| 2042 | // The eliminates the need for doing dictionary lookup in the |
| 2043 | // stub cache for these stubs. |
| 2044 | HandleScope scope; |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2045 | // gcc-4.4 has problem generating correct code of following snippet: |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2046 | // { JSEntryStub stub; |
| 2047 | // js_entry_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2048 | // } |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2049 | // { JSConstructEntryStub stub; |
| 2050 | // js_construct_entry_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2051 | // } |
| 2052 | // To workaround the problem, make separate functions without inlining. |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2053 | Heap::CreateJSEntryStub(); |
| 2054 | Heap::CreateJSConstructEntryStub(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2055 | } |
| 2056 | |
| 2057 | |
| 2058 | bool Heap::CreateInitialObjects() { |
| 2059 | Object* obj; |
| 2060 | |
| 2061 | // The -0 value must be set before NumberFromDouble works. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2062 | { MaybeObject* maybe_obj = AllocateHeapNumber(-0.0, TENURED); |
| 2063 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2064 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2065 | set_minus_zero_value(obj); |
| 2066 | ASSERT(signbit(minus_zero_value()->Number()) != 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2067 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2068 | { MaybeObject* maybe_obj = AllocateHeapNumber(OS::nan_value(), TENURED); |
| 2069 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2070 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2071 | set_nan_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2072 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2073 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_DATA_SPACE); |
| 2074 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2075 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2076 | set_undefined_value(obj); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2077 | Oddball::cast(obj)->set_kind(Oddball::kUndefined); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2078 | ASSERT(!InNewSpace(undefined_value())); |
| 2079 | |
| 2080 | // Allocate initial symbol table. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2081 | { MaybeObject* maybe_obj = SymbolTable::Allocate(kInitialSymbolTableSize); |
| 2082 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2083 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2084 | // Don't use set_symbol_table() due to asserts. |
| 2085 | roots_[kSymbolTableRootIndex] = obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2086 | |
| 2087 | // Assign the print strings for oddballs after creating symboltable. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2088 | Object* symbol; |
| 2089 | { MaybeObject* maybe_symbol = LookupAsciiSymbol("undefined"); |
| 2090 | if (!maybe_symbol->ToObject(&symbol)) return false; |
| 2091 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2092 | Oddball::cast(undefined_value())->set_to_string(String::cast(symbol)); |
| 2093 | Oddball::cast(undefined_value())->set_to_number(nan_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2094 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2095 | // Allocate the null_value |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2096 | { MaybeObject* maybe_obj = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2097 | Oddball::cast(null_value())->Initialize("null", |
| 2098 | Smi::FromInt(0), |
| 2099 | Oddball::kNull); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2100 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2101 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2102 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2103 | { MaybeObject* maybe_obj = CreateOddball("true", |
| 2104 | Smi::FromInt(1), |
| 2105 | Oddball::kTrue); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2106 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2107 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2108 | set_true_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2109 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2110 | { MaybeObject* maybe_obj = CreateOddball("false", |
| 2111 | Smi::FromInt(0), |
| 2112 | Oddball::kFalse); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2113 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2114 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2115 | set_false_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2116 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2117 | { MaybeObject* maybe_obj = CreateOddball("hole", |
| 2118 | Smi::FromInt(-1), |
| 2119 | Oddball::kTheHole); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2120 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2121 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2122 | set_the_hole_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2123 | |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2124 | { MaybeObject* maybe_obj = CreateOddball("arguments_marker", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2125 | Smi::FromInt(-4), |
| 2126 | Oddball::kArgumentMarker); |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2127 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2128 | } |
| 2129 | set_arguments_marker(obj); |
| 2130 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2131 | { MaybeObject* maybe_obj = CreateOddball("no_interceptor_result_sentinel", |
| 2132 | Smi::FromInt(-2), |
| 2133 | Oddball::kOther); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2134 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2135 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2136 | set_no_interceptor_result_sentinel(obj); |
| 2137 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2138 | { MaybeObject* maybe_obj = CreateOddball("termination_exception", |
| 2139 | Smi::FromInt(-3), |
| 2140 | Oddball::kOther); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2141 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2142 | } |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 2143 | set_termination_exception(obj); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2144 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2145 | // Allocate the empty string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2146 | { MaybeObject* maybe_obj = AllocateRawAsciiString(0, TENURED); |
| 2147 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2148 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2149 | set_empty_string(String::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2150 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2151 | for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2152 | { MaybeObject* maybe_obj = |
| 2153 | LookupAsciiSymbol(constant_symbol_table[i].contents); |
| 2154 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2155 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2156 | roots_[constant_symbol_table[i].index] = String::cast(obj); |
| 2157 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2158 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2159 | // Allocate the hidden symbol which is used to identify the hidden properties |
| 2160 | // in JSObjects. The hash code has a special value so that it will not match |
| 2161 | // 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] | 2162 | // 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] | 2163 | // hash code in place. The hash code for the hidden_symbol is zero to ensure |
| 2164 | // 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] | 2165 | { MaybeObject* maybe_obj = |
| 2166 | AllocateSymbol(CStrVector(""), 0, String::kZeroHash); |
| 2167 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2168 | } |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2169 | hidden_symbol_ = String::cast(obj); |
| 2170 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2171 | // Allocate the foreign for __proto__. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2172 | { MaybeObject* maybe_obj = |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2173 | AllocateForeign((Address) &Accessors::ObjectPrototype); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2174 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2175 | } |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2176 | set_prototype_accessors(Foreign::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2177 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2178 | // Allocate the code_stubs dictionary. The initial size is set to avoid |
| 2179 | // expanding the dictionary during bootstrapping. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2180 | { MaybeObject* maybe_obj = NumberDictionary::Allocate(128); |
| 2181 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2182 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2183 | set_code_stubs(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2184 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2185 | // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size |
| 2186 | // is set to avoid expanding the dictionary during bootstrapping. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2187 | { MaybeObject* maybe_obj = NumberDictionary::Allocate(64); |
| 2188 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2189 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2190 | set_non_monomorphic_cache(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2191 | |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 2192 | { MaybeObject* maybe_obj = AllocatePolymorphicCodeCache(); |
| 2193 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2194 | } |
| 2195 | set_polymorphic_code_cache(PolymorphicCodeCache::cast(obj)); |
| 2196 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 2197 | set_instanceof_cache_function(Smi::FromInt(0)); |
| 2198 | set_instanceof_cache_map(Smi::FromInt(0)); |
| 2199 | set_instanceof_cache_answer(Smi::FromInt(0)); |
| 2200 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2201 | CreateFixedStubs(); |
| 2202 | |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2203 | // Allocate the dictionary of intrinsic function names. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2204 | { MaybeObject* maybe_obj = StringDictionary::Allocate(Runtime::kNumFunctions); |
| 2205 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2206 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2207 | { MaybeObject* maybe_obj = Runtime::InitializeIntrinsicFunctionNames(this, |
| 2208 | obj); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2209 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2210 | } |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2211 | set_intrinsic_function_names(StringDictionary::cast(obj)); |
| 2212 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2213 | if (InitializeNumberStringCache()->IsFailure()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2214 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 2215 | // Allocate cache for single character ASCII strings. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2216 | { MaybeObject* maybe_obj = |
| 2217 | AllocateFixedArray(String::kMaxAsciiCharCode + 1, TENURED); |
| 2218 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2219 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2220 | set_single_character_string_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2221 | |
| 2222 | // Allocate cache for external strings pointing to native source code. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2223 | { MaybeObject* maybe_obj = AllocateFixedArray(Natives::GetBuiltinsCount()); |
| 2224 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2225 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2226 | set_natives_source_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2227 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2228 | // Handling of script id generation is in FACTORY->NewScript. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2229 | set_last_script_id(undefined_value()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 2230 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2231 | // Initialize keyed lookup cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2232 | isolate_->keyed_lookup_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2233 | |
| 2234 | // Initialize context slot cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2235 | isolate_->context_slot_cache()->Clear(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2236 | |
| 2237 | // Initialize descriptor cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2238 | isolate_->descriptor_lookup_cache()->Clear(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2239 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 2240 | // Initialize compilation cache. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2241 | isolate_->compilation_cache()->Clear(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2242 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2243 | return true; |
| 2244 | } |
| 2245 | |
| 2246 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2247 | MaybeObject* Heap::InitializeNumberStringCache() { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2248 | // Compute the size of the number string cache based on the max heap size. |
| 2249 | // max_semispace_size_ == 512 KB => number_string_cache_size = 32. |
| 2250 | // max_semispace_size_ == 8 MB => number_string_cache_size = 16KB. |
| 2251 | int number_string_cache_size = max_semispace_size_ / 512; |
| 2252 | 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] | 2253 | Object* obj; |
| 2254 | MaybeObject* maybe_obj = |
| 2255 | AllocateFixedArray(number_string_cache_size * 2, TENURED); |
| 2256 | if (maybe_obj->ToObject(&obj)) set_number_string_cache(FixedArray::cast(obj)); |
| 2257 | return maybe_obj; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2258 | } |
| 2259 | |
| 2260 | |
| 2261 | void Heap::FlushNumberStringCache() { |
| 2262 | // Flush the number to string cache. |
| 2263 | int len = number_string_cache()->length(); |
| 2264 | for (int i = 0; i < len; i++) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2265 | number_string_cache()->set_undefined(this, i); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2266 | } |
| 2267 | } |
| 2268 | |
| 2269 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2270 | static inline int double_get_hash(double d) { |
| 2271 | DoubleRepresentation rep(d); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2272 | 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] | 2273 | } |
| 2274 | |
| 2275 | |
| 2276 | static inline int smi_get_hash(Smi* smi) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2277 | return smi->value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2278 | } |
| 2279 | |
| 2280 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2281 | Object* Heap::GetNumberStringCache(Object* number) { |
| 2282 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2283 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2284 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2285 | hash = smi_get_hash(Smi::cast(number)) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2286 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2287 | hash = double_get_hash(number->Number()) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2288 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2289 | Object* key = number_string_cache()->get(hash * 2); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2290 | if (key == number) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2291 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2292 | } else if (key->IsHeapNumber() && |
| 2293 | number->IsHeapNumber() && |
| 2294 | key->Number() == number->Number()) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2295 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2296 | } |
| 2297 | return undefined_value(); |
| 2298 | } |
| 2299 | |
| 2300 | |
| 2301 | void Heap::SetNumberStringCache(Object* number, String* string) { |
| 2302 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2303 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2304 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2305 | hash = smi_get_hash(Smi::cast(number)) & mask; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2306 | number_string_cache()->set(hash * 2, Smi::cast(number)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2307 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2308 | hash = double_get_hash(number->Number()) & mask; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2309 | number_string_cache()->set(hash * 2, number); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2310 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2311 | number_string_cache()->set(hash * 2 + 1, string); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2312 | } |
| 2313 | |
| 2314 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2315 | MaybeObject* Heap::NumberToString(Object* number, |
| 2316 | bool check_number_string_cache) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2317 | isolate_->counters()->number_to_string_runtime()->Increment(); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 2318 | if (check_number_string_cache) { |
| 2319 | Object* cached = GetNumberStringCache(number); |
| 2320 | if (cached != undefined_value()) { |
| 2321 | return cached; |
| 2322 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2323 | } |
| 2324 | |
| 2325 | char arr[100]; |
| 2326 | Vector<char> buffer(arr, ARRAY_SIZE(arr)); |
| 2327 | const char* str; |
| 2328 | if (number->IsSmi()) { |
| 2329 | int num = Smi::cast(number)->value(); |
| 2330 | str = IntToCString(num, buffer); |
| 2331 | } else { |
| 2332 | double num = HeapNumber::cast(number)->value(); |
| 2333 | str = DoubleToCString(num, buffer); |
| 2334 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2335 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2336 | Object* js_string; |
| 2337 | MaybeObject* maybe_js_string = AllocateStringFromAscii(CStrVector(str)); |
| 2338 | if (maybe_js_string->ToObject(&js_string)) { |
| 2339 | SetNumberStringCache(number, String::cast(js_string)); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2340 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2341 | return maybe_js_string; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2342 | } |
| 2343 | |
| 2344 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2345 | Map* Heap::MapForExternalArrayType(ExternalArrayType array_type) { |
| 2346 | return Map::cast(roots_[RootIndexForExternalArrayType(array_type)]); |
| 2347 | } |
| 2348 | |
| 2349 | |
| 2350 | Heap::RootListIndex Heap::RootIndexForExternalArrayType( |
| 2351 | ExternalArrayType array_type) { |
| 2352 | switch (array_type) { |
| 2353 | case kExternalByteArray: |
| 2354 | return kExternalByteArrayMapRootIndex; |
| 2355 | case kExternalUnsignedByteArray: |
| 2356 | return kExternalUnsignedByteArrayMapRootIndex; |
| 2357 | case kExternalShortArray: |
| 2358 | return kExternalShortArrayMapRootIndex; |
| 2359 | case kExternalUnsignedShortArray: |
| 2360 | return kExternalUnsignedShortArrayMapRootIndex; |
| 2361 | case kExternalIntArray: |
| 2362 | return kExternalIntArrayMapRootIndex; |
| 2363 | case kExternalUnsignedIntArray: |
| 2364 | return kExternalUnsignedIntArrayMapRootIndex; |
| 2365 | case kExternalFloatArray: |
| 2366 | return kExternalFloatArrayMapRootIndex; |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 2367 | case kExternalDoubleArray: |
| 2368 | return kExternalDoubleArrayMapRootIndex; |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2369 | case kExternalPixelArray: |
| 2370 | return kExternalPixelArrayMapRootIndex; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2371 | default: |
| 2372 | UNREACHABLE(); |
| 2373 | return kUndefinedValueRootIndex; |
| 2374 | } |
| 2375 | } |
| 2376 | |
| 2377 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2378 | MaybeObject* Heap::NumberFromDouble(double value, PretenureFlag pretenure) { |
kmillikin@chromium.org | 4111b80 | 2010-05-03 10:34:42 +0000 | [diff] [blame] | 2379 | // We need to distinguish the minus zero value and this cannot be |
| 2380 | // done after conversion to int. Doing this by comparing bit |
| 2381 | // patterns is faster than using fpclassify() et al. |
| 2382 | static const DoubleRepresentation minus_zero(-0.0); |
| 2383 | |
| 2384 | DoubleRepresentation rep(value); |
| 2385 | if (rep.bits == minus_zero.bits) { |
| 2386 | return AllocateHeapNumber(-0.0, pretenure); |
| 2387 | } |
| 2388 | |
| 2389 | int int_value = FastD2I(value); |
| 2390 | if (value == int_value && Smi::IsValid(int_value)) { |
| 2391 | return Smi::FromInt(int_value); |
| 2392 | } |
| 2393 | |
| 2394 | // Materialize the value in the heap. |
| 2395 | return AllocateHeapNumber(value, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2396 | } |
| 2397 | |
| 2398 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2399 | MaybeObject* Heap::AllocateForeign(Address address, PretenureFlag pretenure) { |
| 2400 | // Statically ensure that it is safe to allocate foreigns in paged spaces. |
| 2401 | STATIC_ASSERT(Foreign::kSize <= Page::kMaxHeapObjectSize); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2402 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2403 | Object* result; |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2404 | { MaybeObject* maybe_result = Allocate(foreign_map(), space); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2405 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2406 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2407 | |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 2408 | Foreign::cast(result)->set_address(address); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2409 | return result; |
| 2410 | } |
| 2411 | |
| 2412 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2413 | MaybeObject* Heap::AllocateSharedFunctionInfo(Object* name) { |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2414 | SharedFunctionInfo* share; |
| 2415 | MaybeObject* maybe = Allocate(shared_function_info_map(), OLD_POINTER_SPACE); |
| 2416 | if (!maybe->To<SharedFunctionInfo>(&share)) return maybe; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2417 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2418 | // Set pointer fields. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2419 | share->set_name(name); |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 2420 | Code* illegal = isolate_->builtins()->builtin(Builtins::kIllegal); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2421 | share->set_code(illegal); |
ager@chromium.org | b573749 | 2010-07-15 09:29:43 +0000 | [diff] [blame] | 2422 | share->set_scope_info(SerializedScopeInfo::Empty()); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2423 | Code* construct_stub = |
| 2424 | isolate_->builtins()->builtin(Builtins::kJSConstructStubGeneric); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2425 | share->set_construct_stub(construct_stub); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2426 | share->set_instance_class_name(Object_symbol()); |
| 2427 | share->set_function_data(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2428 | share->set_script(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2429 | share->set_debug_info(undefined_value()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 2430 | share->set_inferred_name(empty_string()); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 2431 | share->set_initial_map(undefined_value()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2432 | share->set_this_property_assignments(undefined_value()); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2433 | share->set_deopt_counter(Smi::FromInt(FLAG_deopt_every_n_times)); |
| 2434 | |
| 2435 | // Set integer fields (smi or int, depending on the architecture). |
| 2436 | share->set_length(0); |
| 2437 | share->set_formal_parameter_count(0); |
| 2438 | share->set_expected_nof_properties(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2439 | share->set_num_literals(0); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2440 | share->set_start_position_and_type(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2441 | share->set_end_position(0); |
| 2442 | share->set_function_token_position(0); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame] | 2443 | // All compiler hints default to false or 0. |
| 2444 | share->set_compiler_hints(0); |
| 2445 | share->set_this_property_assignments_count(0); |
| 2446 | share->set_opt_count(0); |
| 2447 | |
| 2448 | return share; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2449 | } |
| 2450 | |
| 2451 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2452 | MaybeObject* Heap::AllocateJSMessageObject(String* type, |
| 2453 | JSArray* arguments, |
| 2454 | int start_position, |
| 2455 | int end_position, |
| 2456 | Object* script, |
| 2457 | Object* stack_trace, |
| 2458 | Object* stack_frames) { |
| 2459 | Object* result; |
| 2460 | { MaybeObject* maybe_result = Allocate(message_object_map(), NEW_SPACE); |
| 2461 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2462 | } |
| 2463 | JSMessageObject* message = JSMessageObject::cast(result); |
| 2464 | message->set_properties(Heap::empty_fixed_array()); |
| 2465 | message->set_elements(Heap::empty_fixed_array()); |
| 2466 | message->set_type(type); |
| 2467 | message->set_arguments(arguments); |
| 2468 | message->set_start_position(start_position); |
| 2469 | message->set_end_position(end_position); |
| 2470 | message->set_script(script); |
| 2471 | message->set_stack_trace(stack_trace); |
| 2472 | message->set_stack_frames(stack_frames); |
| 2473 | return result; |
| 2474 | } |
| 2475 | |
| 2476 | |
| 2477 | |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2478 | // Returns true for a character in a range. Both limits are inclusive. |
| 2479 | static inline bool Between(uint32_t character, uint32_t from, uint32_t to) { |
| 2480 | // This makes uses of the the unsigned wraparound. |
| 2481 | return character - from <= to - from; |
| 2482 | } |
| 2483 | |
| 2484 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2485 | MUST_USE_RESULT static inline MaybeObject* MakeOrFindTwoCharacterString( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2486 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2487 | uint32_t c1, |
| 2488 | uint32_t c2) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2489 | String* symbol; |
| 2490 | // Numeric strings have a different hash algorithm not known by |
| 2491 | // LookupTwoCharsSymbolIfExists, so we skip this step for such strings. |
| 2492 | if ((!Between(c1, '0', '9') || !Between(c2, '0', '9')) && |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2493 | heap->symbol_table()->LookupTwoCharsSymbolIfExists(c1, c2, &symbol)) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2494 | return symbol; |
| 2495 | // Now we know the length is 2, we might as well make use of that fact |
| 2496 | // when building the new string. |
| 2497 | } else if ((c1 | c2) <= String::kMaxAsciiCharCodeU) { // We can do this |
| 2498 | ASSERT(IsPowerOf2(String::kMaxAsciiCharCodeU + 1)); // because of this. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2499 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2500 | { MaybeObject* maybe_result = heap->AllocateRawAsciiString(2); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2501 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2502 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2503 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2504 | dest[0] = c1; |
| 2505 | dest[1] = c2; |
| 2506 | return result; |
| 2507 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2508 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2509 | { MaybeObject* maybe_result = heap->AllocateRawTwoByteString(2); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2510 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2511 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2512 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
| 2513 | dest[0] = c1; |
| 2514 | dest[1] = c2; |
| 2515 | return result; |
| 2516 | } |
| 2517 | } |
| 2518 | |
| 2519 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2520 | MaybeObject* Heap::AllocateConsString(String* first, String* second) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2521 | int first_length = first->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2522 | if (first_length == 0) { |
| 2523 | return second; |
| 2524 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2525 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2526 | int second_length = second->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2527 | if (second_length == 0) { |
| 2528 | return first; |
| 2529 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2530 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2531 | int length = first_length + second_length; |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2532 | |
| 2533 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2534 | // dictionary. Check whether we already have the string in the symbol |
| 2535 | // table to prevent creation of many unneccesary strings. |
| 2536 | if (length == 2) { |
| 2537 | unsigned c1 = first->Get(0); |
| 2538 | unsigned c2 = second->Get(0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2539 | return MakeOrFindTwoCharacterString(this, c1, c2); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2540 | } |
| 2541 | |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2542 | bool first_is_ascii = first->IsAsciiRepresentation(); |
| 2543 | bool second_is_ascii = second->IsAsciiRepresentation(); |
| 2544 | bool is_ascii = first_is_ascii && second_is_ascii; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2545 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2546 | // 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] | 2547 | // of the new cons string is too large. |
| 2548 | if (length > String::kMaxLength || length < 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2549 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2550 | return Failure::OutOfMemoryException(); |
| 2551 | } |
| 2552 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2553 | bool is_ascii_data_in_two_byte_string = false; |
| 2554 | if (!is_ascii) { |
| 2555 | // At least one of the strings uses two-byte representation so we |
| 2556 | // can't use the fast case code for short ascii strings below, but |
| 2557 | // we can try to save memory if all chars actually fit in ascii. |
| 2558 | is_ascii_data_in_two_byte_string = |
| 2559 | first->HasOnlyAsciiChars() && second->HasOnlyAsciiChars(); |
| 2560 | if (is_ascii_data_in_two_byte_string) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2561 | isolate_->counters()->string_add_runtime_ext_to_ascii()->Increment(); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2562 | } |
| 2563 | } |
| 2564 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2565 | // If the resulting string is small make a flat string. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2566 | if (length < String::kMinNonFlatLength) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2567 | ASSERT(first->IsFlat()); |
| 2568 | ASSERT(second->IsFlat()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2569 | if (is_ascii) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2570 | Object* result; |
| 2571 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2572 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2573 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2574 | // Copy the characters into the new object. |
| 2575 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2576 | // Copy first part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2577 | const char* src; |
| 2578 | if (first->IsExternalString()) { |
| 2579 | src = ExternalAsciiString::cast(first)->resource()->data(); |
| 2580 | } else { |
| 2581 | src = SeqAsciiString::cast(first)->GetChars(); |
| 2582 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2583 | for (int i = 0; i < first_length; i++) *dest++ = src[i]; |
| 2584 | // Copy second part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2585 | if (second->IsExternalString()) { |
| 2586 | src = ExternalAsciiString::cast(second)->resource()->data(); |
| 2587 | } else { |
| 2588 | src = SeqAsciiString::cast(second)->GetChars(); |
| 2589 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2590 | for (int i = 0; i < second_length; i++) *dest++ = src[i]; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2591 | return result; |
| 2592 | } else { |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2593 | if (is_ascii_data_in_two_byte_string) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2594 | Object* result; |
| 2595 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2596 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2597 | } |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2598 | // Copy the characters into the new object. |
| 2599 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2600 | String::WriteToFlat(first, dest, 0, first_length); |
| 2601 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2602 | isolate_->counters()->string_add_runtime_ext_to_ascii()->Increment(); |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2603 | return result; |
| 2604 | } |
| 2605 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2606 | Object* result; |
| 2607 | { MaybeObject* maybe_result = AllocateRawTwoByteString(length); |
| 2608 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2609 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2610 | // Copy the characters into the new object. |
| 2611 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2612 | String::WriteToFlat(first, dest, 0, first_length); |
| 2613 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2614 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2615 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2616 | } |
| 2617 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2618 | Map* map = (is_ascii || is_ascii_data_in_two_byte_string) ? |
| 2619 | cons_ascii_string_map() : cons_string_map(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2620 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2621 | Object* result; |
| 2622 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2623 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2624 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2625 | |
| 2626 | AssertNoAllocation no_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2627 | ConsString* cons_string = ConsString::cast(result); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2628 | WriteBarrierMode mode = cons_string->GetWriteBarrierMode(no_gc); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2629 | cons_string->set_length(length); |
| 2630 | cons_string->set_hash_field(String::kEmptyHashField); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2631 | cons_string->set_first(first, mode); |
| 2632 | cons_string->set_second(second, mode); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2633 | return result; |
| 2634 | } |
| 2635 | |
| 2636 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2637 | MaybeObject* Heap::AllocateSubString(String* buffer, |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 2638 | int start, |
| 2639 | int end, |
| 2640 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2641 | int length = end - start; |
ager@chromium.org | 04921a8 | 2011-06-27 13:21:41 +0000 | [diff] [blame] | 2642 | if (length == 0) { |
| 2643 | return empty_string(); |
| 2644 | } else if (length == 1) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2645 | return LookupSingleCharacterStringFromCode(buffer->Get(start)); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2646 | } else if (length == 2) { |
| 2647 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2648 | // dictionary. Check whether we already have the string in the symbol |
| 2649 | // table to prevent creation of many unneccesary strings. |
| 2650 | unsigned c1 = buffer->Get(start); |
| 2651 | unsigned c2 = buffer->Get(start + 1); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2652 | return MakeOrFindTwoCharacterString(this, c1, c2); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2653 | } |
| 2654 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2655 | // 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] | 2656 | buffer = buffer->TryFlattenGetString(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2657 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2658 | Object* result; |
| 2659 | { MaybeObject* maybe_result = buffer->IsAsciiRepresentation() |
| 2660 | ? AllocateRawAsciiString(length, pretenure ) |
| 2661 | : AllocateRawTwoByteString(length, pretenure); |
| 2662 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2663 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2664 | String* string_result = String::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2665 | // Copy the characters into the new object. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2666 | if (buffer->IsAsciiRepresentation()) { |
| 2667 | ASSERT(string_result->IsAsciiRepresentation()); |
| 2668 | char* dest = SeqAsciiString::cast(string_result)->GetChars(); |
| 2669 | String::WriteToFlat(buffer, dest, start, end); |
| 2670 | } else { |
| 2671 | ASSERT(string_result->IsTwoByteRepresentation()); |
| 2672 | uc16* dest = SeqTwoByteString::cast(string_result)->GetChars(); |
| 2673 | String::WriteToFlat(buffer, dest, start, end); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2674 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2675 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2676 | return result; |
| 2677 | } |
| 2678 | |
| 2679 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2680 | MaybeObject* Heap::AllocateExternalStringFromAscii( |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2681 | ExternalAsciiString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2682 | size_t length = resource->length(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2683 | if (length > static_cast<size_t>(String::kMaxLength)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2684 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2685 | return Failure::OutOfMemoryException(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2686 | } |
| 2687 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2688 | Map* map = external_ascii_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2689 | Object* result; |
| 2690 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2691 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2692 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2693 | |
| 2694 | ExternalAsciiString* external_string = ExternalAsciiString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2695 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2696 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2697 | external_string->set_resource(resource); |
| 2698 | |
| 2699 | return result; |
| 2700 | } |
| 2701 | |
| 2702 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2703 | MaybeObject* Heap::AllocateExternalStringFromTwoByte( |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2704 | ExternalTwoByteString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2705 | size_t length = resource->length(); |
| 2706 | if (length > static_cast<size_t>(String::kMaxLength)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2707 | isolate()->context()->mark_out_of_memory(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2708 | return Failure::OutOfMemoryException(); |
| 2709 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2710 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2711 | // For small strings we check whether the resource contains only |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 2712 | // ASCII characters. If yes, we use a different string map. |
| 2713 | static const size_t kAsciiCheckLengthLimit = 32; |
| 2714 | bool is_ascii = length <= kAsciiCheckLengthLimit && |
| 2715 | String::IsAscii(resource->data(), static_cast<int>(length)); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2716 | Map* map = is_ascii ? |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2717 | external_string_with_ascii_data_map() : external_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2718 | Object* result; |
| 2719 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2720 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2721 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2722 | |
| 2723 | ExternalTwoByteString* external_string = ExternalTwoByteString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2724 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2725 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2726 | external_string->set_resource(resource); |
| 2727 | |
| 2728 | return result; |
| 2729 | } |
| 2730 | |
| 2731 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2732 | MaybeObject* Heap::LookupSingleCharacterStringFromCode(uint16_t code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2733 | if (code <= String::kMaxAsciiCharCode) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2734 | Object* value = single_character_string_cache()->get(code); |
| 2735 | if (value != undefined_value()) return value; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2736 | |
| 2737 | char buffer[1]; |
| 2738 | buffer[0] = static_cast<char>(code); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2739 | Object* result; |
| 2740 | MaybeObject* maybe_result = LookupSymbol(Vector<const char>(buffer, 1)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2741 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2742 | if (!maybe_result->ToObject(&result)) return maybe_result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2743 | single_character_string_cache()->set(code, result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2744 | return result; |
| 2745 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2746 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2747 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2748 | { MaybeObject* maybe_result = AllocateRawTwoByteString(1); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2749 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2750 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2751 | String* answer = String::cast(result); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2752 | answer->Set(0, code); |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2753 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2754 | } |
| 2755 | |
| 2756 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2757 | MaybeObject* Heap::AllocateByteArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2758 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 2759 | return Failure::OutOfMemoryException(); |
| 2760 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2761 | if (pretenure == NOT_TENURED) { |
| 2762 | return AllocateByteArray(length); |
| 2763 | } |
| 2764 | int size = ByteArray::SizeFor(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2765 | Object* result; |
| 2766 | { MaybeObject* maybe_result = (size <= MaxObjectSizeInPagedSpace()) |
| 2767 | ? old_data_space_->AllocateRaw(size) |
| 2768 | : lo_space_->AllocateRaw(size); |
| 2769 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2770 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2771 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2772 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 2773 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2774 | return result; |
| 2775 | } |
| 2776 | |
| 2777 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2778 | MaybeObject* Heap::AllocateByteArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2779 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 2780 | return Failure::OutOfMemoryException(); |
| 2781 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2782 | int size = ByteArray::SizeFor(length); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2783 | AllocationSpace space = |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2784 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2785 | Object* result; |
| 2786 | { MaybeObject* maybe_result = AllocateRaw(size, space, OLD_DATA_SPACE); |
| 2787 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2788 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2789 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2790 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 2791 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2792 | return result; |
| 2793 | } |
| 2794 | |
| 2795 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2796 | void Heap::CreateFillerObjectAt(Address addr, int size) { |
| 2797 | if (size == 0) return; |
| 2798 | HeapObject* filler = HeapObject::FromAddress(addr); |
| 2799 | if (size == kPointerSize) { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2800 | filler->set_map(one_pointer_filler_map()); |
| 2801 | } else if (size == 2 * kPointerSize) { |
| 2802 | filler->set_map(two_pointer_filler_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2803 | } else { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2804 | filler->set_map(byte_array_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2805 | ByteArray::cast(filler)->set_length(ByteArray::LengthFor(size)); |
| 2806 | } |
| 2807 | } |
| 2808 | |
| 2809 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2810 | MaybeObject* Heap::AllocateExternalArray(int length, |
| 2811 | ExternalArrayType array_type, |
| 2812 | void* external_pointer, |
| 2813 | PretenureFlag pretenure) { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2814 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2815 | Object* result; |
| 2816 | { MaybeObject* maybe_result = AllocateRaw(ExternalArray::kAlignedSize, |
| 2817 | space, |
| 2818 | OLD_DATA_SPACE); |
| 2819 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2820 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2821 | |
| 2822 | reinterpret_cast<ExternalArray*>(result)->set_map( |
| 2823 | MapForExternalArrayType(array_type)); |
| 2824 | reinterpret_cast<ExternalArray*>(result)->set_length(length); |
| 2825 | reinterpret_cast<ExternalArray*>(result)->set_external_pointer( |
| 2826 | external_pointer); |
| 2827 | |
| 2828 | return result; |
| 2829 | } |
| 2830 | |
| 2831 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2832 | MaybeObject* Heap::CreateCode(const CodeDesc& desc, |
| 2833 | Code::Flags flags, |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2834 | Handle<Object> self_reference, |
| 2835 | bool immovable) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2836 | // Allocate ByteArray before the Code object, so that we do not risk |
| 2837 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2838 | Object* reloc_info; |
| 2839 | { MaybeObject* maybe_reloc_info = AllocateByteArray(desc.reloc_size, TENURED); |
| 2840 | if (!maybe_reloc_info->ToObject(&reloc_info)) return maybe_reloc_info; |
| 2841 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2842 | |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2843 | // Compute size. |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2844 | int body_size = RoundUp(desc.instr_size, kObjectAlignment); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 2845 | int obj_size = Code::SizeFor(body_size); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 2846 | ASSERT(IsAligned(static_cast<intptr_t>(obj_size), kCodeAlignment)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2847 | MaybeObject* maybe_result; |
danno@chromium.org | 4d3fe4e | 2011-03-10 10:14:28 +0000 | [diff] [blame] | 2848 | // Large code objects and code objects which should stay at a fixed address |
| 2849 | // are allocated in large object space. |
| 2850 | if (obj_size > MaxObjectSizeInPagedSpace() || immovable) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2851 | maybe_result = lo_space_->AllocateRawCode(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2852 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2853 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2854 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2855 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2856 | Object* result; |
| 2857 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2858 | |
| 2859 | // Initialize the object |
| 2860 | HeapObject::cast(result)->set_map(code_map()); |
| 2861 | Code* code = Code::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2862 | ASSERT(!isolate_->code_range()->exists() || |
| 2863 | isolate_->code_range()->contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2864 | code->set_instruction_size(desc.instr_size); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2865 | code->set_relocation_info(ByteArray::cast(reloc_info)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2866 | code->set_flags(flags); |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 2867 | if (code->is_call_stub() || code->is_keyed_call_stub()) { |
| 2868 | code->set_check_type(RECEIVER_MAP_CHECK); |
| 2869 | } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2870 | code->set_deoptimization_data(empty_fixed_array()); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 2871 | code->set_next_code_flushing_candidate(undefined_value()); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 2872 | // Allow self references to created code object by patching the handle to |
| 2873 | // point to the newly allocated Code object. |
| 2874 | if (!self_reference.is_null()) { |
| 2875 | *(self_reference.location()) = code; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2876 | } |
| 2877 | // Migrate generated code. |
| 2878 | // The generated code can contain Object** values (typically from handles) |
| 2879 | // that are dereferenced during the copy to point directly to the actual heap |
| 2880 | // objects. These pointers can include references to the code object itself, |
| 2881 | // through the self_reference parameter. |
| 2882 | code->CopyFrom(desc); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2883 | |
| 2884 | #ifdef DEBUG |
| 2885 | code->Verify(); |
| 2886 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2887 | return code; |
| 2888 | } |
| 2889 | |
| 2890 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2891 | MaybeObject* Heap::CopyCode(Code* code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2892 | // Allocate an object the same size as the code object. |
| 2893 | int obj_size = code->Size(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2894 | MaybeObject* maybe_result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2895 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2896 | maybe_result = lo_space_->AllocateRawCode(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2897 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2898 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2899 | } |
| 2900 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2901 | Object* result; |
| 2902 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2903 | |
| 2904 | // Copy code object. |
| 2905 | Address old_addr = code->address(); |
| 2906 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2907 | CopyBlock(new_addr, old_addr, obj_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2908 | // Relocate the copy. |
| 2909 | Code* new_code = Code::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2910 | ASSERT(!isolate_->code_range()->exists() || |
| 2911 | isolate_->code_range()->contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2912 | new_code->Relocate(new_addr - old_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2913 | return new_code; |
| 2914 | } |
| 2915 | |
| 2916 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2917 | MaybeObject* Heap::CopyCode(Code* code, Vector<byte> reloc_info) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2918 | // Allocate ByteArray before the Code object, so that we do not risk |
| 2919 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2920 | Object* reloc_info_array; |
| 2921 | { MaybeObject* maybe_reloc_info_array = |
| 2922 | AllocateByteArray(reloc_info.length(), TENURED); |
| 2923 | if (!maybe_reloc_info_array->ToObject(&reloc_info_array)) { |
| 2924 | return maybe_reloc_info_array; |
| 2925 | } |
| 2926 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2927 | |
| 2928 | int new_body_size = RoundUp(code->instruction_size(), kObjectAlignment); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2929 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 2930 | int new_obj_size = Code::SizeFor(new_body_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2931 | |
| 2932 | Address old_addr = code->address(); |
| 2933 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2934 | size_t relocation_offset = |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2935 | static_cast<size_t>(code->instruction_end() - old_addr); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2936 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2937 | MaybeObject* maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2938 | if (new_obj_size > MaxObjectSizeInPagedSpace()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2939 | maybe_result = lo_space_->AllocateRawCode(new_obj_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2940 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2941 | maybe_result = code_space_->AllocateRaw(new_obj_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2942 | } |
| 2943 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2944 | Object* result; |
| 2945 | if (!maybe_result->ToObject(&result)) return maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2946 | |
| 2947 | // Copy code object. |
| 2948 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
| 2949 | |
| 2950 | // Copy header and instructions. |
| 2951 | memcpy(new_addr, old_addr, relocation_offset); |
| 2952 | |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2953 | Code* new_code = Code::cast(result); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2954 | new_code->set_relocation_info(ByteArray::cast(reloc_info_array)); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2955 | |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2956 | // Copy patched rinfo. |
| 2957 | memcpy(new_code->relocation_start(), reloc_info.start(), reloc_info.length()); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2958 | |
| 2959 | // Relocate the copy. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2960 | ASSERT(!isolate_->code_range()->exists() || |
| 2961 | isolate_->code_range()->contains(code->address())); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2962 | new_code->Relocate(new_addr - old_addr); |
| 2963 | |
| 2964 | #ifdef DEBUG |
| 2965 | code->Verify(); |
| 2966 | #endif |
| 2967 | return new_code; |
| 2968 | } |
| 2969 | |
| 2970 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2971 | MaybeObject* Heap::Allocate(Map* map, AllocationSpace space) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2972 | ASSERT(gc_state_ == NOT_IN_GC); |
| 2973 | ASSERT(map->instance_type() != MAP_TYPE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2974 | // If allocation failures are disallowed, we may allocate in a different |
| 2975 | // space when new space is full and the object is not a large object. |
| 2976 | AllocationSpace retry_space = |
| 2977 | (space != NEW_SPACE) ? space : TargetSpaceId(map->instance_type()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2978 | Object* result; |
| 2979 | { MaybeObject* maybe_result = |
| 2980 | AllocateRaw(map->instance_size(), space, retry_space); |
| 2981 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2982 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2983 | HeapObject::cast(result)->set_map(map); |
| 2984 | return result; |
| 2985 | } |
| 2986 | |
| 2987 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2988 | MaybeObject* Heap::InitializeFunction(JSFunction* function, |
| 2989 | SharedFunctionInfo* shared, |
| 2990 | Object* prototype) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2991 | ASSERT(!prototype->IsMap()); |
| 2992 | function->initialize_properties(); |
| 2993 | function->initialize_elements(); |
| 2994 | function->set_shared(shared); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2995 | function->set_code(shared->code()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2996 | function->set_prototype_or_initial_map(prototype); |
| 2997 | function->set_context(undefined_value()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2998 | function->set_literals(empty_fixed_array()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2999 | function->set_next_function_link(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3000 | return function; |
| 3001 | } |
| 3002 | |
| 3003 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3004 | MaybeObject* Heap::AllocateFunctionPrototype(JSFunction* function) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3005 | // Allocate the prototype. Make sure to use the object function |
| 3006 | // from the function's context, since the function can be from a |
| 3007 | // different context. |
| 3008 | JSFunction* object_function = |
| 3009 | function->context()->global_context()->object_function(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3010 | Object* prototype; |
| 3011 | { MaybeObject* maybe_prototype = AllocateJSObject(object_function); |
| 3012 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3013 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3014 | // When creating the prototype for the function we must set its |
| 3015 | // constructor to the function. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3016 | Object* result; |
| 3017 | { MaybeObject* maybe_result = |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 3018 | JSObject::cast(prototype)->SetLocalPropertyIgnoreAttributes( |
| 3019 | constructor_symbol(), function, DONT_ENUM); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3020 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3021 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3022 | return prototype; |
| 3023 | } |
| 3024 | |
| 3025 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3026 | MaybeObject* Heap::AllocateFunction(Map* function_map, |
| 3027 | SharedFunctionInfo* shared, |
| 3028 | Object* prototype, |
| 3029 | PretenureFlag pretenure) { |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3030 | AllocationSpace space = |
| 3031 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3032 | Object* result; |
| 3033 | { MaybeObject* maybe_result = Allocate(function_map, space); |
| 3034 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3035 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3036 | return InitializeFunction(JSFunction::cast(result), shared, prototype); |
| 3037 | } |
| 3038 | |
| 3039 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3040 | MaybeObject* Heap::AllocateArgumentsObject(Object* callee, int length) { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 3041 | // To get fast allocation and map sharing for arguments objects we |
| 3042 | // allocate them based on an arguments boilerplate. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3043 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3044 | JSObject* boilerplate; |
| 3045 | int arguments_object_size; |
| 3046 | bool strict_mode_callee = callee->IsJSFunction() && |
| 3047 | JSFunction::cast(callee)->shared()->strict_mode(); |
| 3048 | if (strict_mode_callee) { |
| 3049 | boilerplate = |
| 3050 | isolate()->context()->global_context()-> |
| 3051 | strict_mode_arguments_boilerplate(); |
| 3052 | arguments_object_size = kArgumentsObjectSizeStrict; |
| 3053 | } else { |
| 3054 | boilerplate = |
| 3055 | isolate()->context()->global_context()->arguments_boilerplate(); |
| 3056 | arguments_object_size = kArgumentsObjectSize; |
| 3057 | } |
| 3058 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3059 | // This calls Copy directly rather than using Heap::AllocateRaw so we |
| 3060 | // duplicate the check here. |
| 3061 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 3062 | |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3063 | // Check that the size of the boilerplate matches our |
| 3064 | // expectations. The ArgumentsAccessStub::GenerateNewObject relies |
| 3065 | // on the size being a known constant. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3066 | ASSERT(arguments_object_size == boilerplate->map()->instance_size()); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 3067 | |
| 3068 | // Do the allocation. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3069 | Object* result; |
| 3070 | { MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3071 | AllocateRaw(arguments_object_size, NEW_SPACE, OLD_POINTER_SPACE); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3072 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3073 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3074 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3075 | // Copy the content. The arguments boilerplate doesn't have any |
| 3076 | // fields that point to new space so it's safe to skip the write |
| 3077 | // barrier here. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3078 | CopyBlock(HeapObject::cast(result)->address(), |
| 3079 | boilerplate->address(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3080 | JSObject::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3081 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3082 | // Set the length property. |
| 3083 | JSObject::cast(result)->InObjectPropertyAtPut(kArgumentsLengthIndex, |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3084 | Smi::FromInt(length), |
| 3085 | SKIP_WRITE_BARRIER); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3086 | // Set the callee property for non-strict mode arguments object only. |
| 3087 | if (!strict_mode_callee) { |
| 3088 | JSObject::cast(result)->InObjectPropertyAtPut(kArgumentsCalleeIndex, |
| 3089 | callee); |
| 3090 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3091 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3092 | // Check the state of the object |
| 3093 | ASSERT(JSObject::cast(result)->HasFastProperties()); |
| 3094 | ASSERT(JSObject::cast(result)->HasFastElements()); |
| 3095 | |
| 3096 | return result; |
| 3097 | } |
| 3098 | |
| 3099 | |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3100 | static bool HasDuplicates(DescriptorArray* descriptors) { |
| 3101 | int count = descriptors->number_of_descriptors(); |
| 3102 | if (count > 1) { |
| 3103 | String* prev_key = descriptors->GetKey(0); |
| 3104 | for (int i = 1; i != count; i++) { |
| 3105 | String* current_key = descriptors->GetKey(i); |
| 3106 | if (prev_key == current_key) return true; |
| 3107 | prev_key = current_key; |
| 3108 | } |
| 3109 | } |
| 3110 | return false; |
| 3111 | } |
| 3112 | |
| 3113 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3114 | MaybeObject* Heap::AllocateInitialMap(JSFunction* fun) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3115 | ASSERT(!fun->has_initial_map()); |
| 3116 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3117 | // First create a new map with the size and number of in-object properties |
| 3118 | // suggested by the function. |
| 3119 | int instance_size = fun->shared()->CalculateInstanceSize(); |
| 3120 | int in_object_properties = fun->shared()->CalculateInObjectProperties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3121 | Object* map_obj; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3122 | { MaybeObject* maybe_map_obj = AllocateMap(JS_OBJECT_TYPE, instance_size); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3123 | if (!maybe_map_obj->ToObject(&map_obj)) return maybe_map_obj; |
| 3124 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3125 | |
| 3126 | // Fetch or allocate prototype. |
| 3127 | Object* prototype; |
| 3128 | if (fun->has_instance_prototype()) { |
| 3129 | prototype = fun->instance_prototype(); |
| 3130 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3131 | { MaybeObject* maybe_prototype = AllocateFunctionPrototype(fun); |
| 3132 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3133 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3134 | } |
| 3135 | Map* map = Map::cast(map_obj); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3136 | map->set_inobject_properties(in_object_properties); |
| 3137 | map->set_unused_property_fields(in_object_properties); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3138 | map->set_prototype(prototype); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3139 | ASSERT(map->has_fast_elements()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3140 | |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3141 | // If the function has only simple this property assignments add |
| 3142 | // field descriptors for these to the initial map as the object |
| 3143 | // cannot be constructed without having these properties. Guard by |
| 3144 | // the inline_new flag so we only change the map if we generate a |
| 3145 | // specialized construct stub. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3146 | ASSERT(in_object_properties <= Map::kMaxPreAllocatedPropertyFields); |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3147 | if (fun->shared()->CanGenerateInlineConstructor(prototype)) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3148 | int count = fun->shared()->this_property_assignments_count(); |
| 3149 | if (count > in_object_properties) { |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3150 | // Inline constructor can only handle inobject properties. |
| 3151 | fun->shared()->ForbidInlineConstructor(); |
| 3152 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3153 | Object* descriptors_obj; |
| 3154 | { MaybeObject* maybe_descriptors_obj = DescriptorArray::Allocate(count); |
| 3155 | if (!maybe_descriptors_obj->ToObject(&descriptors_obj)) { |
| 3156 | return maybe_descriptors_obj; |
| 3157 | } |
| 3158 | } |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3159 | DescriptorArray* descriptors = DescriptorArray::cast(descriptors_obj); |
| 3160 | for (int i = 0; i < count; i++) { |
| 3161 | String* name = fun->shared()->GetThisPropertyAssignmentName(i); |
| 3162 | ASSERT(name->IsSymbol()); |
| 3163 | FieldDescriptor field(name, i, NONE); |
| 3164 | field.SetEnumerationIndex(i); |
| 3165 | descriptors->Set(i, &field); |
| 3166 | } |
| 3167 | descriptors->SetNextEnumerationIndex(count); |
| 3168 | descriptors->SortUnchecked(); |
| 3169 | |
| 3170 | // The descriptors may contain duplicates because the compiler does not |
| 3171 | // guarantee the uniqueness of property names (it would have required |
| 3172 | // quadratic time). Once the descriptors are sorted we can check for |
| 3173 | // duplicates in linear time. |
| 3174 | if (HasDuplicates(descriptors)) { |
| 3175 | fun->shared()->ForbidInlineConstructor(); |
| 3176 | } else { |
| 3177 | map->set_instance_descriptors(descriptors); |
| 3178 | map->set_pre_allocated_property_fields(count); |
| 3179 | map->set_unused_property_fields(in_object_properties - count); |
| 3180 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3181 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3182 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3183 | |
| 3184 | fun->shared()->StartInobjectSlackTracking(map); |
| 3185 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3186 | return map; |
| 3187 | } |
| 3188 | |
| 3189 | |
| 3190 | void Heap::InitializeJSObjectFromMap(JSObject* obj, |
| 3191 | FixedArray* properties, |
| 3192 | Map* map) { |
| 3193 | obj->set_properties(properties); |
| 3194 | obj->initialize_elements(); |
| 3195 | // TODO(1240798): Initialize the object's body using valid initial values |
| 3196 | // according to the object's initial map. For example, if the map's |
| 3197 | // instance type is JS_ARRAY_TYPE, the length field should be initialized |
| 3198 | // to a number (eg, Smi::FromInt(0)) and the elements initialized to a |
| 3199 | // fixed array (eg, Heap::empty_fixed_array()). Currently, the object |
| 3200 | // verification code has to cope with (temporarily) invalid objects. See |
| 3201 | // for example, JSArray::JSArrayVerify). |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3202 | Object* filler; |
| 3203 | // We cannot always fill with one_pointer_filler_map because objects |
| 3204 | // created from API functions expect their internal fields to be initialized |
| 3205 | // with undefined_value. |
| 3206 | if (map->constructor()->IsJSFunction() && |
| 3207 | JSFunction::cast(map->constructor())->shared()-> |
| 3208 | IsInobjectSlackTrackingInProgress()) { |
| 3209 | // We might want to shrink the object later. |
| 3210 | ASSERT(obj->GetInternalFieldCount() == 0); |
| 3211 | filler = Heap::one_pointer_filler_map(); |
| 3212 | } else { |
| 3213 | filler = Heap::undefined_value(); |
| 3214 | } |
| 3215 | obj->InitializeBody(map->instance_size(), filler); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3216 | } |
| 3217 | |
| 3218 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3219 | MaybeObject* Heap::AllocateJSObjectFromMap(Map* map, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3220 | // JSFunctions should be allocated using AllocateFunction to be |
| 3221 | // properly initialized. |
| 3222 | ASSERT(map->instance_type() != JS_FUNCTION_TYPE); |
| 3223 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3224 | // Both types of global objects should be allocated using |
| 3225 | // AllocateGlobalObject to be properly initialized. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3226 | ASSERT(map->instance_type() != JS_GLOBAL_OBJECT_TYPE); |
| 3227 | ASSERT(map->instance_type() != JS_BUILTINS_OBJECT_TYPE); |
| 3228 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3229 | // Allocate the backing storage for the properties. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3230 | int prop_size = |
| 3231 | map->pre_allocated_property_fields() + |
| 3232 | map->unused_property_fields() - |
| 3233 | map->inobject_properties(); |
| 3234 | ASSERT(prop_size >= 0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3235 | Object* properties; |
| 3236 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, pretenure); |
| 3237 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3238 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3239 | |
| 3240 | // Allocate the JSObject. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3241 | AllocationSpace space = |
| 3242 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3243 | if (map->instance_size() > MaxObjectSizeInPagedSpace()) space = LO_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3244 | Object* obj; |
| 3245 | { MaybeObject* maybe_obj = Allocate(map, space); |
| 3246 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3247 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3248 | |
| 3249 | // Initialize the JSObject. |
| 3250 | InitializeJSObjectFromMap(JSObject::cast(obj), |
| 3251 | FixedArray::cast(properties), |
| 3252 | map); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3253 | ASSERT(JSObject::cast(obj)->HasFastElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3254 | return obj; |
| 3255 | } |
| 3256 | |
| 3257 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3258 | MaybeObject* Heap::AllocateJSObject(JSFunction* constructor, |
| 3259 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3260 | // Allocate the initial map if absent. |
| 3261 | if (!constructor->has_initial_map()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3262 | Object* initial_map; |
| 3263 | { MaybeObject* maybe_initial_map = AllocateInitialMap(constructor); |
| 3264 | if (!maybe_initial_map->ToObject(&initial_map)) return maybe_initial_map; |
| 3265 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3266 | constructor->set_initial_map(Map::cast(initial_map)); |
| 3267 | Map::cast(initial_map)->set_constructor(constructor); |
| 3268 | } |
| 3269 | // Allocate the object based on the constructors initial map. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3270 | MaybeObject* result = |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3271 | AllocateJSObjectFromMap(constructor->initial_map(), pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3272 | #ifdef DEBUG |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3273 | // Make sure result is NOT a global object if valid. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3274 | Object* non_failure; |
| 3275 | ASSERT(!result->ToObject(&non_failure) || !non_failure->IsGlobalObject()); |
| 3276 | #endif |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3277 | return result; |
| 3278 | } |
| 3279 | |
| 3280 | |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3281 | MaybeObject* Heap::AllocateJSProxy(Object* handler, Object* prototype) { |
| 3282 | // Allocate map. |
| 3283 | // TODO(rossberg): Once we optimize proxies, think about a scheme to share |
| 3284 | // 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] | 3285 | Map* map; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3286 | MaybeObject* maybe_map_obj = AllocateMap(JS_PROXY_TYPE, JSProxy::kSize); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3287 | if (!maybe_map_obj->To<Map>(&map)) return maybe_map_obj; |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3288 | map->set_prototype(prototype); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3289 | |
| 3290 | // Allocate the proxy object. |
| 3291 | Object* result; |
| 3292 | MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 3293 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3294 | JSProxy::cast(result)->set_handler(handler); |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3295 | JSProxy::cast(result)->set_padding(Smi::FromInt(0)); |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 3296 | return result; |
| 3297 | } |
| 3298 | |
| 3299 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3300 | MaybeObject* Heap::AllocateGlobalObject(JSFunction* constructor) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3301 | ASSERT(constructor->has_initial_map()); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3302 | Map* map = constructor->initial_map(); |
| 3303 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3304 | // Make sure no field properties are described in the initial map. |
| 3305 | // This guarantees us that normalizing the properties does not |
| 3306 | // require us to change property values to JSGlobalPropertyCells. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3307 | ASSERT(map->NextFreePropertyIndex() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3308 | |
| 3309 | // Make sure we don't have a ton of pre-allocated slots in the |
| 3310 | // global objects. They will be unused once we normalize the object. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3311 | ASSERT(map->unused_property_fields() == 0); |
| 3312 | ASSERT(map->inobject_properties() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3313 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3314 | // Initial size of the backing store to avoid resize of the storage during |
| 3315 | // bootstrapping. The size differs between the JS global object ad the |
| 3316 | // builtins object. |
| 3317 | 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] | 3318 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3319 | // Allocate a dictionary object for backing storage. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3320 | Object* obj; |
| 3321 | { MaybeObject* maybe_obj = |
| 3322 | StringDictionary::Allocate( |
| 3323 | map->NumberOfDescribedProperties() * 2 + initial_size); |
| 3324 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3325 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3326 | StringDictionary* dictionary = StringDictionary::cast(obj); |
| 3327 | |
| 3328 | // The global object might be created from an object template with accessors. |
| 3329 | // Fill these accessors into the dictionary. |
| 3330 | DescriptorArray* descs = map->instance_descriptors(); |
| 3331 | for (int i = 0; i < descs->number_of_descriptors(); i++) { |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 3332 | PropertyDetails details(descs->GetDetails(i)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3333 | ASSERT(details.type() == CALLBACKS); // Only accessors are expected. |
| 3334 | PropertyDetails d = |
| 3335 | PropertyDetails(details.attributes(), CALLBACKS, details.index()); |
| 3336 | Object* value = descs->GetCallbacksObject(i); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3337 | { MaybeObject* maybe_value = AllocateJSGlobalPropertyCell(value); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3338 | if (!maybe_value->ToObject(&value)) return maybe_value; |
| 3339 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3340 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3341 | Object* result; |
| 3342 | { MaybeObject* maybe_result = dictionary->Add(descs->GetKey(i), value, d); |
| 3343 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3344 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3345 | dictionary = StringDictionary::cast(result); |
| 3346 | } |
| 3347 | |
| 3348 | // Allocate the global object and initialize it with the backing store. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3349 | { MaybeObject* maybe_obj = Allocate(map, OLD_POINTER_SPACE); |
| 3350 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3351 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3352 | JSObject* global = JSObject::cast(obj); |
| 3353 | InitializeJSObjectFromMap(global, dictionary, map); |
| 3354 | |
| 3355 | // Create a new map for the global object. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3356 | { MaybeObject* maybe_obj = map->CopyDropDescriptors(); |
| 3357 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3358 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3359 | Map* new_map = Map::cast(obj); |
| 3360 | |
| 3361 | // Setup the global object as a normalized object. |
| 3362 | global->set_map(new_map); |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 3363 | global->map()->clear_instance_descriptors(); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3364 | global->set_properties(dictionary); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3365 | |
| 3366 | // Make sure result is a global object with properties in dictionary. |
| 3367 | ASSERT(global->IsGlobalObject()); |
| 3368 | ASSERT(!global->HasFastProperties()); |
| 3369 | return global; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3370 | } |
| 3371 | |
| 3372 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3373 | MaybeObject* Heap::CopyJSObject(JSObject* source) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3374 | // Never used to copy functions. If functions need to be copied we |
| 3375 | // have to be careful to clear the literals array. |
| 3376 | ASSERT(!source->IsJSFunction()); |
| 3377 | |
| 3378 | // Make the clone. |
| 3379 | Map* map = source->map(); |
| 3380 | int object_size = map->instance_size(); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3381 | Object* clone; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3382 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3383 | // If we're forced to always allocate, we use the general allocation |
| 3384 | // functions which may leave us with an object in old space. |
| 3385 | if (always_allocate()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3386 | { MaybeObject* maybe_clone = |
| 3387 | AllocateRaw(object_size, NEW_SPACE, OLD_POINTER_SPACE); |
| 3388 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3389 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3390 | Address clone_address = HeapObject::cast(clone)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3391 | CopyBlock(clone_address, |
| 3392 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3393 | object_size); |
| 3394 | // Update write barrier for all fields that lie beyond the header. |
vegorov@chromium.org | f837290 | 2010-03-15 10:26:20 +0000 | [diff] [blame] | 3395 | RecordWrites(clone_address, |
| 3396 | JSObject::kHeaderSize, |
antonm@chromium.org | 8e5e338 | 2010-03-24 09:56:30 +0000 | [diff] [blame] | 3397 | (object_size - JSObject::kHeaderSize) / kPointerSize); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3398 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3399 | { MaybeObject* maybe_clone = new_space_.AllocateRaw(object_size); |
| 3400 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3401 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3402 | ASSERT(InNewSpace(clone)); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3403 | // 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] | 3404 | // the contents without worrying about updating the write barrier. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3405 | CopyBlock(HeapObject::cast(clone)->address(), |
| 3406 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3407 | object_size); |
| 3408 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3409 | |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3410 | FixedArrayBase* elements = FixedArrayBase::cast(source->elements()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3411 | FixedArray* properties = FixedArray::cast(source->properties()); |
| 3412 | // Update elements if necessary. |
ager@chromium.org | b26c50a | 2010-03-26 09:27:16 +0000 | [diff] [blame] | 3413 | if (elements->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3414 | Object* elem; |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3415 | { MaybeObject* maybe_elem; |
| 3416 | if (elements->map() == fixed_cow_array_map()) { |
| 3417 | maybe_elem = FixedArray::cast(elements); |
| 3418 | } else if (source->HasFastDoubleElements()) { |
| 3419 | maybe_elem = CopyFixedDoubleArray(FixedDoubleArray::cast(elements)); |
| 3420 | } else { |
| 3421 | maybe_elem = CopyFixedArray(FixedArray::cast(elements)); |
| 3422 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3423 | if (!maybe_elem->ToObject(&elem)) return maybe_elem; |
| 3424 | } |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3425 | JSObject::cast(clone)->set_elements(FixedArrayBase::cast(elem)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3426 | } |
| 3427 | // Update properties if necessary. |
| 3428 | if (properties->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3429 | Object* prop; |
| 3430 | { MaybeObject* maybe_prop = CopyFixedArray(properties); |
| 3431 | if (!maybe_prop->ToObject(&prop)) return maybe_prop; |
| 3432 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3433 | JSObject::cast(clone)->set_properties(FixedArray::cast(prop)); |
| 3434 | } |
| 3435 | // Return the new clone. |
| 3436 | return clone; |
| 3437 | } |
| 3438 | |
| 3439 | |
rossberg@chromium.org | 717967f | 2011-07-20 13:44:42 +0000 | [diff] [blame] | 3440 | MaybeObject* Heap::ReinitializeJSProxyAsJSObject(JSProxy* object) { |
| 3441 | // Allocate fresh map. |
| 3442 | // TODO(rossberg): Once we optimize proxies, cache these maps. |
| 3443 | Map* map; |
| 3444 | MaybeObject* maybe_map_obj = |
| 3445 | AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| 3446 | if (!maybe_map_obj->To<Map>(&map)) return maybe_map_obj; |
| 3447 | |
| 3448 | // Check that the receiver has the same size as a fresh object. |
| 3449 | ASSERT(map->instance_size() == object->map()->instance_size()); |
| 3450 | |
| 3451 | map->set_prototype(object->map()->prototype()); |
| 3452 | |
| 3453 | // Allocate the backing storage for the properties. |
| 3454 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
| 3455 | Object* properties; |
| 3456 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, TENURED); |
| 3457 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3458 | } |
| 3459 | |
| 3460 | // Reset the map for the object. |
| 3461 | object->set_map(map); |
| 3462 | |
| 3463 | // Reinitialize the object from the constructor map. |
| 3464 | InitializeJSObjectFromMap(JSObject::cast(object), |
| 3465 | FixedArray::cast(properties), map); |
| 3466 | return object; |
| 3467 | } |
| 3468 | |
| 3469 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3470 | MaybeObject* Heap::ReinitializeJSGlobalProxy(JSFunction* constructor, |
| 3471 | JSGlobalProxy* object) { |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3472 | ASSERT(constructor->has_initial_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3473 | Map* map = constructor->initial_map(); |
| 3474 | |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3475 | // 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] | 3476 | // objects allocated using the constructor. |
| 3477 | ASSERT(map->instance_size() == object->map()->instance_size()); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3478 | ASSERT(map->instance_type() == object->map()->instance_type()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3479 | |
| 3480 | // Allocate the backing storage for the properties. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3481 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3482 | Object* properties; |
| 3483 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, TENURED); |
| 3484 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3485 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3486 | |
| 3487 | // Reset the map for the object. |
| 3488 | object->set_map(constructor->initial_map()); |
| 3489 | |
| 3490 | // Reinitialize the object from the constructor map. |
| 3491 | InitializeJSObjectFromMap(object, FixedArray::cast(properties), map); |
| 3492 | return object; |
| 3493 | } |
| 3494 | |
| 3495 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3496 | MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string, |
| 3497 | PretenureFlag pretenure) { |
| 3498 | Object* result; |
| 3499 | { MaybeObject* maybe_result = |
| 3500 | AllocateRawAsciiString(string.length(), pretenure); |
| 3501 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3502 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3503 | |
| 3504 | // Copy the characters into the new object. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3505 | SeqAsciiString* string_result = SeqAsciiString::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3506 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3507 | string_result->SeqAsciiStringSet(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3508 | } |
| 3509 | return result; |
| 3510 | } |
| 3511 | |
| 3512 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3513 | MaybeObject* Heap::AllocateStringFromUtf8Slow(Vector<const char> string, |
| 3514 | PretenureFlag pretenure) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3515 | // V8 only supports characters in the Basic Multilingual Plane. |
| 3516 | const uc32 kMaxSupportedChar = 0xFFFF; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3517 | // Count the number of characters in the UTF-8 string and check if |
| 3518 | // it is an ASCII string. |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 3519 | Access<UnicodeCache::Utf8Decoder> |
| 3520 | decoder(isolate_->unicode_cache()->utf8_decoder()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3521 | decoder->Reset(string.start(), string.length()); |
| 3522 | int chars = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3523 | while (decoder->has_more()) { |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3524 | decoder->GetNext(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3525 | chars++; |
| 3526 | } |
| 3527 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3528 | Object* result; |
| 3529 | { MaybeObject* maybe_result = AllocateRawTwoByteString(chars, pretenure); |
| 3530 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3531 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3532 | |
| 3533 | // Convert and copy the characters into the new object. |
| 3534 | String* string_result = String::cast(result); |
| 3535 | decoder->Reset(string.start(), string.length()); |
| 3536 | for (int i = 0; i < chars; i++) { |
| 3537 | uc32 r = decoder->GetNext(); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3538 | if (r > kMaxSupportedChar) { r = unibrow::Utf8::kBadChar; } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3539 | string_result->Set(i, r); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3540 | } |
| 3541 | return result; |
| 3542 | } |
| 3543 | |
| 3544 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3545 | MaybeObject* Heap::AllocateStringFromTwoByte(Vector<const uc16> string, |
| 3546 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3547 | // Check if the string is an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3548 | MaybeObject* maybe_result; |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3549 | if (String::IsAscii(string.start(), string.length())) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3550 | maybe_result = AllocateRawAsciiString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3551 | } else { // It's not an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3552 | maybe_result = AllocateRawTwoByteString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3553 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3554 | Object* result; |
| 3555 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3556 | |
| 3557 | // Copy the characters into the new object, which may be either ASCII or |
| 3558 | // UTF-16. |
| 3559 | String* string_result = String::cast(result); |
| 3560 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3561 | string_result->Set(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3562 | } |
| 3563 | return result; |
| 3564 | } |
| 3565 | |
| 3566 | |
| 3567 | Map* Heap::SymbolMapForString(String* string) { |
| 3568 | // If the string is in new space it cannot be used as a symbol. |
| 3569 | if (InNewSpace(string)) return NULL; |
| 3570 | |
| 3571 | // Find the corresponding symbol map for strings. |
| 3572 | Map* map = string->map(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3573 | if (map == ascii_string_map()) { |
| 3574 | return ascii_symbol_map(); |
| 3575 | } |
| 3576 | if (map == string_map()) { |
| 3577 | return symbol_map(); |
| 3578 | } |
| 3579 | if (map == cons_string_map()) { |
| 3580 | return cons_symbol_map(); |
| 3581 | } |
| 3582 | if (map == cons_ascii_string_map()) { |
| 3583 | return cons_ascii_symbol_map(); |
| 3584 | } |
| 3585 | if (map == external_string_map()) { |
| 3586 | return external_symbol_map(); |
| 3587 | } |
| 3588 | if (map == external_ascii_string_map()) { |
| 3589 | return external_ascii_symbol_map(); |
| 3590 | } |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 3591 | if (map == external_string_with_ascii_data_map()) { |
| 3592 | return external_symbol_with_ascii_data_map(); |
| 3593 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3594 | |
| 3595 | // No match found. |
| 3596 | return NULL; |
| 3597 | } |
| 3598 | |
| 3599 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3600 | MaybeObject* Heap::AllocateInternalSymbol(unibrow::CharacterStream* buffer, |
| 3601 | int chars, |
| 3602 | uint32_t hash_field) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3603 | ASSERT(chars >= 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3604 | // Ensure the chars matches the number of characters in the buffer. |
| 3605 | ASSERT(static_cast<unsigned>(chars) == buffer->Length()); |
| 3606 | // Determine whether the string is ascii. |
| 3607 | bool is_ascii = true; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3608 | while (buffer->has_more()) { |
| 3609 | if (buffer->GetNext() > unibrow::Utf8::kMaxOneByteChar) { |
| 3610 | is_ascii = false; |
| 3611 | break; |
| 3612 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3613 | } |
| 3614 | buffer->Rewind(); |
| 3615 | |
| 3616 | // Compute map and object size. |
| 3617 | int size; |
| 3618 | Map* map; |
| 3619 | |
| 3620 | if (is_ascii) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3621 | if (chars > SeqAsciiString::kMaxLength) { |
| 3622 | return Failure::OutOfMemoryException(); |
| 3623 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3624 | map = ascii_symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3625 | size = SeqAsciiString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3626 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3627 | if (chars > SeqTwoByteString::kMaxLength) { |
| 3628 | return Failure::OutOfMemoryException(); |
| 3629 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3630 | map = symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3631 | size = SeqTwoByteString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3632 | } |
| 3633 | |
| 3634 | // Allocate string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3635 | Object* result; |
| 3636 | { MaybeObject* maybe_result = (size > MaxObjectSizeInPagedSpace()) |
| 3637 | ? lo_space_->AllocateRaw(size) |
| 3638 | : old_data_space_->AllocateRaw(size); |
| 3639 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3640 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3641 | |
| 3642 | reinterpret_cast<HeapObject*>(result)->set_map(map); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3643 | // Set length and hash fields of the allocated string. |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3644 | String* answer = String::cast(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3645 | answer->set_length(chars); |
| 3646 | answer->set_hash_field(hash_field); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3647 | |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3648 | ASSERT_EQ(size, answer->Size()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3649 | |
| 3650 | // Fill in the characters. |
| 3651 | for (int i = 0; i < chars; i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3652 | answer->Set(i, buffer->GetNext()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3653 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3654 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3655 | } |
| 3656 | |
| 3657 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3658 | MaybeObject* Heap::AllocateRawAsciiString(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3659 | if (length < 0 || length > SeqAsciiString::kMaxLength) { |
| 3660 | return Failure::OutOfMemoryException(); |
| 3661 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3662 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3663 | int size = SeqAsciiString::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3664 | ASSERT(size <= SeqAsciiString::kMaxSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3665 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3666 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3667 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 3668 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3669 | if (space == NEW_SPACE) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3670 | if (size > kMaxObjectSizeInNewSpace) { |
| 3671 | // Allocate in large object space, retry space will be ignored. |
| 3672 | space = LO_SPACE; |
| 3673 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 3674 | // Allocate in new space, retry in large object space. |
| 3675 | retry_space = LO_SPACE; |
| 3676 | } |
| 3677 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 3678 | space = LO_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3679 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3680 | Object* result; |
| 3681 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 3682 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3683 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3684 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3685 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3686 | HeapObject::cast(result)->set_map(ascii_string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3687 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3688 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3689 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 3690 | return result; |
| 3691 | } |
| 3692 | |
| 3693 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3694 | MaybeObject* Heap::AllocateRawTwoByteString(int length, |
| 3695 | PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3696 | if (length < 0 || length > SeqTwoByteString::kMaxLength) { |
| 3697 | return Failure::OutOfMemoryException(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3698 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3699 | int size = SeqTwoByteString::SizeFor(length); |
| 3700 | ASSERT(size <= SeqTwoByteString::kMaxSize); |
| 3701 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3702 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 3703 | |
| 3704 | if (space == NEW_SPACE) { |
| 3705 | if (size > kMaxObjectSizeInNewSpace) { |
| 3706 | // Allocate in large object space, retry space will be ignored. |
| 3707 | space = LO_SPACE; |
| 3708 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 3709 | // Allocate in new space, retry in large object space. |
| 3710 | retry_space = LO_SPACE; |
| 3711 | } |
| 3712 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 3713 | space = LO_SPACE; |
| 3714 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3715 | Object* result; |
| 3716 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 3717 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3718 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3719 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3720 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3721 | HeapObject::cast(result)->set_map(string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3722 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3723 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3724 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 3725 | return result; |
| 3726 | } |
| 3727 | |
| 3728 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3729 | MaybeObject* Heap::AllocateEmptyFixedArray() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3730 | int size = FixedArray::SizeFor(0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3731 | Object* result; |
| 3732 | { MaybeObject* maybe_result = |
| 3733 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 3734 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3735 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3736 | // Initialize the object. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3737 | reinterpret_cast<FixedArray*>(result)->set_map(fixed_array_map()); |
| 3738 | reinterpret_cast<FixedArray*>(result)->set_length(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3739 | return result; |
| 3740 | } |
| 3741 | |
| 3742 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3743 | MaybeObject* Heap::AllocateRawFixedArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3744 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 3745 | return Failure::OutOfMemoryException(); |
| 3746 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3747 | ASSERT(length > 0); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3748 | // Use the general function if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3749 | if (always_allocate()) return AllocateFixedArray(length, TENURED); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3750 | // Allocate the raw data for a fixed array. |
| 3751 | int size = FixedArray::SizeFor(length); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3752 | return size <= kMaxObjectSizeInNewSpace |
| 3753 | ? new_space_.AllocateRaw(size) |
| 3754 | : lo_space_->AllocateRawFixedArray(size); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3755 | } |
| 3756 | |
| 3757 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3758 | MaybeObject* Heap::CopyFixedArrayWithMap(FixedArray* src, Map* map) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3759 | int len = src->length(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3760 | Object* obj; |
| 3761 | { MaybeObject* maybe_obj = AllocateRawFixedArray(len); |
| 3762 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3763 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3764 | if (InNewSpace(obj)) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3765 | HeapObject* dst = HeapObject::cast(obj); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3766 | dst->set_map(map); |
| 3767 | CopyBlock(dst->address() + kPointerSize, |
| 3768 | src->address() + kPointerSize, |
| 3769 | FixedArray::SizeFor(len) - kPointerSize); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3770 | return obj; |
| 3771 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3772 | HeapObject::cast(obj)->set_map(map); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3773 | FixedArray* result = FixedArray::cast(obj); |
| 3774 | result->set_length(len); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3775 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3776 | // Copy the content |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3777 | AssertNoAllocation no_gc; |
| 3778 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3779 | for (int i = 0; i < len; i++) result->set(i, src->get(i), mode); |
| 3780 | return result; |
| 3781 | } |
| 3782 | |
| 3783 | |
ricow@chromium.org | 2c99e28 | 2011-07-28 09:15:17 +0000 | [diff] [blame] | 3784 | MaybeObject* Heap::CopyFixedDoubleArrayWithMap(FixedDoubleArray* src, |
| 3785 | Map* map) { |
| 3786 | int len = src->length(); |
| 3787 | Object* obj; |
| 3788 | { MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(len, NOT_TENURED); |
| 3789 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3790 | } |
| 3791 | HeapObject* dst = HeapObject::cast(obj); |
| 3792 | dst->set_map(map); |
| 3793 | CopyBlock( |
| 3794 | dst->address() + FixedDoubleArray::kLengthOffset, |
| 3795 | src->address() + FixedDoubleArray::kLengthOffset, |
| 3796 | FixedDoubleArray::SizeFor(len) - FixedDoubleArray::kLengthOffset); |
| 3797 | return obj; |
| 3798 | } |
| 3799 | |
| 3800 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3801 | MaybeObject* Heap::AllocateFixedArray(int length) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3802 | ASSERT(length >= 0); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3803 | if (length == 0) return empty_fixed_array(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3804 | Object* result; |
| 3805 | { MaybeObject* maybe_result = AllocateRawFixedArray(length); |
| 3806 | if (!maybe_result->ToObject(&result)) return maybe_result; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3807 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3808 | // Initialize header. |
| 3809 | FixedArray* array = reinterpret_cast<FixedArray*>(result); |
| 3810 | array->set_map(fixed_array_map()); |
| 3811 | array->set_length(length); |
| 3812 | // Initialize body. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3813 | ASSERT(!InNewSpace(undefined_value())); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3814 | MemsetPointer(array->data_start(), undefined_value(), length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3815 | return result; |
| 3816 | } |
| 3817 | |
| 3818 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3819 | MaybeObject* Heap::AllocateRawFixedArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3820 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 3821 | return Failure::OutOfMemoryException(); |
| 3822 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3823 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3824 | AllocationSpace space = |
| 3825 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3826 | int size = FixedArray::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3827 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 3828 | // Too big for new space. |
| 3829 | space = LO_SPACE; |
| 3830 | } else if (space == OLD_POINTER_SPACE && |
| 3831 | size > MaxObjectSizeInPagedSpace()) { |
| 3832 | // Too big for old pointer space. |
| 3833 | space = LO_SPACE; |
| 3834 | } |
| 3835 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3836 | AllocationSpace retry_space = |
| 3837 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_POINTER_SPACE : LO_SPACE; |
| 3838 | |
| 3839 | return AllocateRaw(size, space, retry_space); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3840 | } |
| 3841 | |
| 3842 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3843 | MUST_USE_RESULT static MaybeObject* AllocateFixedArrayWithFiller( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3844 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3845 | int length, |
| 3846 | PretenureFlag pretenure, |
| 3847 | Object* filler) { |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3848 | ASSERT(length >= 0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3849 | ASSERT(heap->empty_fixed_array()->IsFixedArray()); |
| 3850 | if (length == 0) return heap->empty_fixed_array(); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3851 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3852 | ASSERT(!heap->InNewSpace(filler)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3853 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3854 | { MaybeObject* maybe_result = heap->AllocateRawFixedArray(length, pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3855 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3856 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3857 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3858 | HeapObject::cast(result)->set_map(heap->fixed_array_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3859 | FixedArray* array = FixedArray::cast(result); |
| 3860 | array->set_length(length); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3861 | MemsetPointer(array->data_start(), filler, length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3862 | return array; |
| 3863 | } |
| 3864 | |
| 3865 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3866 | MaybeObject* Heap::AllocateFixedArray(int length, PretenureFlag pretenure) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3867 | return AllocateFixedArrayWithFiller(this, |
| 3868 | length, |
| 3869 | pretenure, |
| 3870 | undefined_value()); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3871 | } |
| 3872 | |
| 3873 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3874 | MaybeObject* Heap::AllocateFixedArrayWithHoles(int length, |
| 3875 | PretenureFlag pretenure) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3876 | return AllocateFixedArrayWithFiller(this, |
| 3877 | length, |
| 3878 | pretenure, |
| 3879 | the_hole_value()); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3880 | } |
| 3881 | |
| 3882 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3883 | MaybeObject* Heap::AllocateUninitializedFixedArray(int length) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3884 | if (length == 0) return empty_fixed_array(); |
| 3885 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3886 | Object* obj; |
| 3887 | { MaybeObject* maybe_obj = AllocateRawFixedArray(length); |
| 3888 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3889 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3890 | |
| 3891 | reinterpret_cast<FixedArray*>(obj)->set_map(fixed_array_map()); |
| 3892 | FixedArray::cast(obj)->set_length(length); |
| 3893 | return obj; |
| 3894 | } |
| 3895 | |
| 3896 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 3897 | MaybeObject* Heap::AllocateEmptyFixedDoubleArray() { |
| 3898 | int size = FixedDoubleArray::SizeFor(0); |
| 3899 | Object* result; |
| 3900 | { MaybeObject* maybe_result = |
| 3901 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 3902 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3903 | } |
| 3904 | // Initialize the object. |
| 3905 | reinterpret_cast<FixedDoubleArray*>(result)->set_map( |
| 3906 | fixed_double_array_map()); |
| 3907 | reinterpret_cast<FixedDoubleArray*>(result)->set_length(0); |
| 3908 | return result; |
| 3909 | } |
| 3910 | |
| 3911 | |
| 3912 | MaybeObject* Heap::AllocateUninitializedFixedDoubleArray( |
| 3913 | int length, |
| 3914 | PretenureFlag pretenure) { |
| 3915 | if (length == 0) return empty_fixed_double_array(); |
| 3916 | |
| 3917 | Object* obj; |
| 3918 | { MaybeObject* maybe_obj = AllocateRawFixedDoubleArray(length, pretenure); |
| 3919 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3920 | } |
| 3921 | |
| 3922 | reinterpret_cast<FixedDoubleArray*>(obj)->set_map(fixed_double_array_map()); |
| 3923 | FixedDoubleArray::cast(obj)->set_length(length); |
| 3924 | return obj; |
| 3925 | } |
| 3926 | |
| 3927 | |
| 3928 | MaybeObject* Heap::AllocateRawFixedDoubleArray(int length, |
| 3929 | PretenureFlag pretenure) { |
| 3930 | if (length < 0 || length > FixedDoubleArray::kMaxLength) { |
| 3931 | return Failure::OutOfMemoryException(); |
| 3932 | } |
| 3933 | |
| 3934 | AllocationSpace space = |
| 3935 | (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3936 | int size = FixedDoubleArray::SizeFor(length); |
| 3937 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 3938 | // Too big for new space. |
| 3939 | space = LO_SPACE; |
| 3940 | } else if (space == OLD_DATA_SPACE && |
| 3941 | size > MaxObjectSizeInPagedSpace()) { |
| 3942 | // Too big for old data space. |
| 3943 | space = LO_SPACE; |
| 3944 | } |
| 3945 | |
| 3946 | AllocationSpace retry_space = |
| 3947 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_DATA_SPACE : LO_SPACE; |
| 3948 | |
| 3949 | return AllocateRaw(size, space, retry_space); |
| 3950 | } |
| 3951 | |
| 3952 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3953 | MaybeObject* Heap::AllocateHashTable(int length, PretenureFlag pretenure) { |
| 3954 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3955 | { MaybeObject* maybe_result = AllocateFixedArray(length, pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3956 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3957 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3958 | reinterpret_cast<HeapObject*>(result)->set_map(hash_table_map()); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 3959 | ASSERT(result->IsHashTable()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3960 | return result; |
| 3961 | } |
| 3962 | |
| 3963 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3964 | MaybeObject* Heap::AllocateGlobalContext() { |
| 3965 | Object* result; |
| 3966 | { MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3967 | AllocateFixedArray(Context::GLOBAL_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3968 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3969 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3970 | Context* context = reinterpret_cast<Context*>(result); |
| 3971 | context->set_map(global_context_map()); |
| 3972 | ASSERT(context->IsGlobalContext()); |
| 3973 | ASSERT(result->IsContext()); |
| 3974 | return result; |
| 3975 | } |
| 3976 | |
| 3977 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3978 | MaybeObject* Heap::AllocateFunctionContext(int length, JSFunction* function) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3979 | ASSERT(length >= Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3980 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3981 | { MaybeObject* maybe_result = AllocateFixedArray(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3982 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3983 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3984 | Context* context = reinterpret_cast<Context*>(result); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 3985 | context->set_map(function_context_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3986 | context->set_closure(function); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 3987 | context->set_previous(function->context()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3988 | context->set_extension(NULL); |
| 3989 | context->set_global(function->context()->global()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 3990 | return context; |
| 3991 | } |
| 3992 | |
| 3993 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 3994 | MaybeObject* Heap::AllocateCatchContext(JSFunction* function, |
| 3995 | Context* previous, |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 3996 | String* name, |
| 3997 | Object* thrown_object) { |
| 3998 | STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == Context::THROWN_OBJECT_INDEX); |
| 3999 | Object* result; |
| 4000 | { MaybeObject* maybe_result = |
| 4001 | AllocateFixedArray(Context::MIN_CONTEXT_SLOTS + 1); |
| 4002 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4003 | } |
| 4004 | Context* context = reinterpret_cast<Context*>(result); |
| 4005 | context->set_map(catch_context_map()); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4006 | context->set_closure(function); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4007 | context->set_previous(previous); |
| 4008 | context->set_extension(name); |
| 4009 | context->set_global(previous->global()); |
| 4010 | context->set(Context::THROWN_OBJECT_INDEX, thrown_object); |
| 4011 | return context; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4012 | } |
| 4013 | |
| 4014 | |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4015 | MaybeObject* Heap::AllocateWithContext(JSFunction* function, |
| 4016 | Context* previous, |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4017 | JSObject* extension) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4018 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4019 | { MaybeObject* maybe_result = AllocateFixedArray(Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4020 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4021 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4022 | Context* context = reinterpret_cast<Context*>(result); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4023 | context->set_map(with_context_map()); |
vegorov@chromium.org | 3cf4731 | 2011-06-29 13:20:01 +0000 | [diff] [blame] | 4024 | context->set_closure(function); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4025 | context->set_previous(previous); |
| 4026 | context->set_extension(extension); |
| 4027 | context->set_global(previous->global()); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 4028 | return context; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4029 | } |
| 4030 | |
| 4031 | |
whesse@chromium.org | 4acdc2c | 2011-08-15 13:01:23 +0000 | [diff] [blame^] | 4032 | MaybeObject* Heap::AllocateBlockContext(JSFunction* function, |
| 4033 | Context* previous, |
| 4034 | SerializedScopeInfo* scope_info) { |
| 4035 | Object* result; |
| 4036 | { MaybeObject* maybe_result = |
| 4037 | AllocateFixedArray(scope_info->NumberOfContextSlots()); |
| 4038 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4039 | } |
| 4040 | // TODO(keuchel): properly initialize context slots. |
| 4041 | Context* context = reinterpret_cast<Context*>(result); |
| 4042 | context->set_map(block_context_map()); |
| 4043 | context->set_closure(function); |
| 4044 | context->set_previous(previous); |
| 4045 | context->set_extension(scope_info); |
| 4046 | context->set_global(previous->global()); |
| 4047 | return context; |
| 4048 | } |
| 4049 | |
| 4050 | |
| 4051 | MaybeObject* Heap::AllocateSerializedScopeInfo(int length) { |
| 4052 | Object* result; |
| 4053 | { MaybeObject* maybe_result = AllocateFixedArray(length, TENURED); |
| 4054 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4055 | } |
| 4056 | SerializedScopeInfo* scope_info = |
| 4057 | reinterpret_cast<SerializedScopeInfo*>(result); |
| 4058 | scope_info->set_map(serialized_scope_info_map()); |
| 4059 | return scope_info; |
| 4060 | } |
| 4061 | |
| 4062 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4063 | MaybeObject* Heap::AllocateStruct(InstanceType type) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4064 | Map* map; |
| 4065 | switch (type) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4066 | #define MAKE_CASE(NAME, Name, name) \ |
| 4067 | case NAME##_TYPE: map = name##_map(); break; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4068 | STRUCT_LIST(MAKE_CASE) |
| 4069 | #undef MAKE_CASE |
| 4070 | default: |
| 4071 | UNREACHABLE(); |
| 4072 | return Failure::InternalError(); |
| 4073 | } |
| 4074 | int size = map->instance_size(); |
| 4075 | AllocationSpace space = |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4076 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : OLD_POINTER_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4077 | Object* result; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4078 | { MaybeObject* maybe_result = Allocate(map, space); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4079 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 4080 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4081 | Struct::cast(result)->InitializeBody(size); |
| 4082 | return result; |
| 4083 | } |
| 4084 | |
| 4085 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4086 | bool Heap::IdleNotification() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4087 | static const int kIdlesBeforeScavenge = 4; |
| 4088 | static const int kIdlesBeforeMarkSweep = 7; |
| 4089 | static const int kIdlesBeforeMarkCompact = 8; |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4090 | static const int kMaxIdleCount = kIdlesBeforeMarkCompact + 1; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 4091 | static const unsigned int kGCsBetweenCleanup = 4; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4092 | |
| 4093 | if (!last_idle_notification_gc_count_init_) { |
| 4094 | last_idle_notification_gc_count_ = gc_count_; |
| 4095 | last_idle_notification_gc_count_init_ = true; |
| 4096 | } |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4097 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4098 | bool uncommit = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4099 | bool finished = false; |
| 4100 | |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4101 | // Reset the number of idle notifications received when a number of |
| 4102 | // GCs have taken place. This allows another round of cleanup based |
| 4103 | // on idle notifications if enough work has been carried out to |
| 4104 | // provoke a number of garbage collections. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4105 | if (gc_count_ - last_idle_notification_gc_count_ < kGCsBetweenCleanup) { |
| 4106 | number_idle_notifications_ = |
| 4107 | Min(number_idle_notifications_ + 1, kMaxIdleCount); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4108 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4109 | number_idle_notifications_ = 0; |
| 4110 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4111 | } |
| 4112 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4113 | if (number_idle_notifications_ == kIdlesBeforeScavenge) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4114 | if (contexts_disposed_ > 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4115 | HistogramTimerScope scope(isolate_->counters()->gc_context()); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4116 | CollectAllGarbage(false); |
| 4117 | } else { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 4118 | CollectGarbage(NEW_SPACE); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4119 | } |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4120 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4121 | last_idle_notification_gc_count_ = gc_count_; |
| 4122 | } else if (number_idle_notifications_ == kIdlesBeforeMarkSweep) { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4123 | // Before doing the mark-sweep collections we clear the |
| 4124 | // compilation cache to avoid hanging on to source code and |
| 4125 | // generated code for cached functions. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4126 | isolate_->compilation_cache()->Clear(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4127 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4128 | CollectAllGarbage(false); |
| 4129 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4130 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4131 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4132 | } else if (number_idle_notifications_ == kIdlesBeforeMarkCompact) { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4133 | CollectAllGarbage(true); |
| 4134 | new_space_.Shrink(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4135 | last_idle_notification_gc_count_ = gc_count_; |
| 4136 | number_idle_notifications_ = 0; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4137 | finished = true; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4138 | } else if (contexts_disposed_ > 0) { |
| 4139 | if (FLAG_expose_gc) { |
| 4140 | contexts_disposed_ = 0; |
| 4141 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4142 | HistogramTimerScope scope(isolate_->counters()->gc_context()); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4143 | CollectAllGarbage(false); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4144 | last_idle_notification_gc_count_ = gc_count_; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4145 | } |
| 4146 | // If this is the first idle notification, we reset the |
| 4147 | // notification count to avoid letting idle notifications for |
| 4148 | // context disposal garbage collections start a potentially too |
| 4149 | // aggressive idle GC cycle. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4150 | if (number_idle_notifications_ <= 1) { |
| 4151 | number_idle_notifications_ = 0; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4152 | uncommit = false; |
| 4153 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4154 | } else if (number_idle_notifications_ > kIdlesBeforeMarkCompact) { |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 4155 | // If we have received more than kIdlesBeforeMarkCompact idle |
| 4156 | // notifications we do not perform any cleanup because we don't |
| 4157 | // expect to gain much by doing so. |
| 4158 | finished = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4159 | } |
| 4160 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 4161 | // Make sure that we have no pending context disposals and |
| 4162 | // conditionally uncommit from space. |
| 4163 | ASSERT(contexts_disposed_ == 0); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4164 | if (uncommit) UncommitFromSpace(); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 4165 | return finished; |
| 4166 | } |
| 4167 | |
| 4168 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4169 | #ifdef DEBUG |
| 4170 | |
| 4171 | void Heap::Print() { |
| 4172 | if (!HasBeenSetup()) return; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4173 | isolate()->PrintStack(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4174 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4175 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4176 | space->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4177 | } |
| 4178 | |
| 4179 | |
| 4180 | void Heap::ReportCodeStatistics(const char* title) { |
| 4181 | PrintF(">>>>>> Code Stats (%s) >>>>>>\n", title); |
| 4182 | PagedSpace::ResetCodeStatistics(); |
| 4183 | // We do not look for code in new space, map space, or old space. If code |
| 4184 | // somehow ends up in those spaces, we would miss it here. |
| 4185 | code_space_->CollectCodeStatistics(); |
| 4186 | lo_space_->CollectCodeStatistics(); |
| 4187 | PagedSpace::ReportCodeStatistics(); |
| 4188 | } |
| 4189 | |
| 4190 | |
| 4191 | // This function expects that NewSpace's allocated objects histogram is |
| 4192 | // populated (via a call to CollectStatistics or else as a side effect of a |
| 4193 | // just-completed scavenge collection). |
| 4194 | void Heap::ReportHeapStatistics(const char* title) { |
| 4195 | USE(title); |
| 4196 | PrintF(">>>>>> =============== %s (%d) =============== >>>>>>\n", |
| 4197 | title, gc_count_); |
| 4198 | PrintF("mark-compact GC : %d\n", mc_count_); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4199 | PrintF("old_gen_promotion_limit_ %" V8_PTR_PREFIX "d\n", |
| 4200 | old_gen_promotion_limit_); |
| 4201 | PrintF("old_gen_allocation_limit_ %" V8_PTR_PREFIX "d\n", |
| 4202 | old_gen_allocation_limit_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4203 | |
| 4204 | PrintF("\n"); |
| 4205 | PrintF("Number of handles : %d\n", HandleScope::NumberOfHandles()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4206 | isolate_->global_handles()->PrintStats(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4207 | PrintF("\n"); |
| 4208 | |
| 4209 | PrintF("Heap statistics : "); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4210 | isolate_->memory_allocator()->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4211 | PrintF("To space : "); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4212 | new_space_.ReportStatistics(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4213 | PrintF("Old pointer space : "); |
| 4214 | old_pointer_space_->ReportStatistics(); |
| 4215 | PrintF("Old data space : "); |
| 4216 | old_data_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4217 | PrintF("Code space : "); |
| 4218 | code_space_->ReportStatistics(); |
| 4219 | PrintF("Map space : "); |
| 4220 | map_space_->ReportStatistics(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4221 | PrintF("Cell space : "); |
| 4222 | cell_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4223 | PrintF("Large object space : "); |
| 4224 | lo_space_->ReportStatistics(); |
| 4225 | PrintF(">>>>>> ========================================= >>>>>>\n"); |
| 4226 | } |
| 4227 | |
| 4228 | #endif // DEBUG |
| 4229 | |
| 4230 | bool Heap::Contains(HeapObject* value) { |
| 4231 | return Contains(value->address()); |
| 4232 | } |
| 4233 | |
| 4234 | |
| 4235 | bool Heap::Contains(Address addr) { |
| 4236 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 4237 | return HasBeenSetup() && |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4238 | (new_space_.ToSpaceContains(addr) || |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4239 | old_pointer_space_->Contains(addr) || |
| 4240 | old_data_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4241 | code_space_->Contains(addr) || |
| 4242 | map_space_->Contains(addr) || |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4243 | cell_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4244 | lo_space_->SlowContains(addr)); |
| 4245 | } |
| 4246 | |
| 4247 | |
| 4248 | bool Heap::InSpace(HeapObject* value, AllocationSpace space) { |
| 4249 | return InSpace(value->address(), space); |
| 4250 | } |
| 4251 | |
| 4252 | |
| 4253 | bool Heap::InSpace(Address addr, AllocationSpace space) { |
| 4254 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 4255 | if (!HasBeenSetup()) return false; |
| 4256 | |
| 4257 | switch (space) { |
| 4258 | case NEW_SPACE: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4259 | return new_space_.ToSpaceContains(addr); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4260 | case OLD_POINTER_SPACE: |
| 4261 | return old_pointer_space_->Contains(addr); |
| 4262 | case OLD_DATA_SPACE: |
| 4263 | return old_data_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4264 | case CODE_SPACE: |
| 4265 | return code_space_->Contains(addr); |
| 4266 | case MAP_SPACE: |
| 4267 | return map_space_->Contains(addr); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4268 | case CELL_SPACE: |
| 4269 | return cell_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4270 | case LO_SPACE: |
| 4271 | return lo_space_->SlowContains(addr); |
| 4272 | } |
| 4273 | |
| 4274 | return false; |
| 4275 | } |
| 4276 | |
| 4277 | |
| 4278 | #ifdef DEBUG |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4279 | static void DummyScavengePointer(HeapObject** p) { |
| 4280 | } |
| 4281 | |
| 4282 | |
| 4283 | static void VerifyPointersUnderWatermark( |
| 4284 | PagedSpace* space, |
| 4285 | DirtyRegionCallback visit_dirty_region) { |
| 4286 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 4287 | |
| 4288 | while (it.has_next()) { |
| 4289 | Page* page = it.next(); |
| 4290 | Address start = page->ObjectAreaStart(); |
| 4291 | Address end = page->AllocationWatermark(); |
| 4292 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4293 | HEAP->IterateDirtyRegions(Page::kAllRegionsDirtyMarks, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4294 | start, |
| 4295 | end, |
| 4296 | visit_dirty_region, |
| 4297 | &DummyScavengePointer); |
| 4298 | } |
| 4299 | } |
| 4300 | |
| 4301 | |
| 4302 | static void VerifyPointersUnderWatermark(LargeObjectSpace* space) { |
| 4303 | LargeObjectIterator it(space); |
| 4304 | for (HeapObject* object = it.next(); object != NULL; object = it.next()) { |
| 4305 | if (object->IsFixedArray()) { |
| 4306 | Address slot_address = object->address(); |
| 4307 | Address end = object->address() + object->Size(); |
| 4308 | |
| 4309 | while (slot_address < end) { |
| 4310 | HeapObject** slot = reinterpret_cast<HeapObject**>(slot_address); |
| 4311 | // When we are not in GC the Heap::InNewSpace() predicate |
| 4312 | // checks that pointers which satisfy predicate point into |
| 4313 | // the active semispace. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4314 | HEAP->InNewSpace(*slot); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4315 | slot_address += kPointerSize; |
| 4316 | } |
| 4317 | } |
| 4318 | } |
| 4319 | } |
| 4320 | |
| 4321 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4322 | void Heap::Verify() { |
| 4323 | ASSERT(HasBeenSetup()); |
| 4324 | |
| 4325 | VerifyPointersVisitor visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4326 | IterateRoots(&visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4327 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4328 | new_space_.Verify(); |
| 4329 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4330 | VerifyPointersAndDirtyRegionsVisitor dirty_regions_visitor; |
| 4331 | old_pointer_space_->Verify(&dirty_regions_visitor); |
| 4332 | map_space_->Verify(&dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4333 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4334 | VerifyPointersUnderWatermark(old_pointer_space_, |
| 4335 | &IteratePointersInDirtyRegion); |
| 4336 | VerifyPointersUnderWatermark(map_space_, |
| 4337 | &IteratePointersInDirtyMapsRegion); |
| 4338 | VerifyPointersUnderWatermark(lo_space_); |
| 4339 | |
| 4340 | VerifyPageWatermarkValidity(old_pointer_space_, ALL_INVALID); |
| 4341 | VerifyPageWatermarkValidity(map_space_, ALL_INVALID); |
| 4342 | |
| 4343 | VerifyPointersVisitor no_dirty_regions_visitor; |
| 4344 | old_data_space_->Verify(&no_dirty_regions_visitor); |
| 4345 | code_space_->Verify(&no_dirty_regions_visitor); |
| 4346 | cell_space_->Verify(&no_dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4347 | |
| 4348 | lo_space_->Verify(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4349 | } |
| 4350 | #endif // DEBUG |
| 4351 | |
| 4352 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4353 | MaybeObject* Heap::LookupSymbol(Vector<const char> string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4354 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4355 | Object* new_table; |
| 4356 | { MaybeObject* maybe_new_table = |
| 4357 | symbol_table()->LookupSymbol(string, &symbol); |
| 4358 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4359 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4360 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4361 | // SymbolTable is a singleton and checks for identity. |
| 4362 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4363 | ASSERT(symbol != NULL); |
| 4364 | return symbol; |
| 4365 | } |
| 4366 | |
| 4367 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4368 | MaybeObject* Heap::LookupAsciiSymbol(Vector<const char> string) { |
| 4369 | Object* symbol = NULL; |
| 4370 | Object* new_table; |
| 4371 | { MaybeObject* maybe_new_table = |
| 4372 | symbol_table()->LookupAsciiSymbol(string, &symbol); |
| 4373 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4374 | } |
| 4375 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4376 | // SymbolTable is a singleton and checks for identity. |
| 4377 | roots_[kSymbolTableRootIndex] = new_table; |
| 4378 | ASSERT(symbol != NULL); |
| 4379 | return symbol; |
| 4380 | } |
| 4381 | |
| 4382 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 4383 | MaybeObject* Heap::LookupAsciiSymbol(Handle<SeqAsciiString> string, |
| 4384 | int from, |
| 4385 | int length) { |
| 4386 | Object* symbol = NULL; |
| 4387 | Object* new_table; |
| 4388 | { MaybeObject* maybe_new_table = |
| 4389 | symbol_table()->LookupSubStringAsciiSymbol(string, |
| 4390 | from, |
| 4391 | length, |
| 4392 | &symbol); |
| 4393 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4394 | } |
| 4395 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4396 | // SymbolTable is a singleton and checks for identity. |
| 4397 | roots_[kSymbolTableRootIndex] = new_table; |
| 4398 | ASSERT(symbol != NULL); |
| 4399 | return symbol; |
| 4400 | } |
| 4401 | |
| 4402 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4403 | MaybeObject* Heap::LookupTwoByteSymbol(Vector<const uc16> string) { |
| 4404 | Object* symbol = NULL; |
| 4405 | Object* new_table; |
| 4406 | { MaybeObject* maybe_new_table = |
| 4407 | symbol_table()->LookupTwoByteSymbol(string, &symbol); |
| 4408 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4409 | } |
| 4410 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4411 | // SymbolTable is a singleton and checks for identity. |
| 4412 | roots_[kSymbolTableRootIndex] = new_table; |
| 4413 | ASSERT(symbol != NULL); |
| 4414 | return symbol; |
| 4415 | } |
| 4416 | |
| 4417 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4418 | MaybeObject* Heap::LookupSymbol(String* string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4419 | if (string->IsSymbol()) return string; |
| 4420 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4421 | Object* new_table; |
| 4422 | { MaybeObject* maybe_new_table = |
| 4423 | symbol_table()->LookupString(string, &symbol); |
| 4424 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4425 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4426 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4427 | // SymbolTable is a singleton and checks for identity. |
| 4428 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4429 | ASSERT(symbol != NULL); |
| 4430 | return symbol; |
| 4431 | } |
| 4432 | |
| 4433 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4434 | bool Heap::LookupSymbolIfExists(String* string, String** symbol) { |
| 4435 | if (string->IsSymbol()) { |
| 4436 | *symbol = string; |
| 4437 | return true; |
| 4438 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4439 | return symbol_table()->LookupSymbolIfExists(string, symbol); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4440 | } |
| 4441 | |
| 4442 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4443 | #ifdef DEBUG |
| 4444 | void Heap::ZapFromSpace() { |
erik.corry@gmail.com | d91075f | 2011-02-10 07:45:38 +0000 | [diff] [blame] | 4445 | ASSERT(reinterpret_cast<Object*>(kFromSpaceZapValue)->IsFailure()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4446 | for (Address a = new_space_.FromSpaceLow(); |
| 4447 | a < new_space_.FromSpaceHigh(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4448 | a += kPointerSize) { |
| 4449 | Memory::Address_at(a) = kFromSpaceZapValue; |
| 4450 | } |
| 4451 | } |
| 4452 | #endif // DEBUG |
| 4453 | |
| 4454 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4455 | bool Heap::IteratePointersInDirtyRegion(Heap* heap, |
| 4456 | Address start, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4457 | Address end, |
| 4458 | ObjectSlotCallback copy_object_func) { |
| 4459 | Address slot_address = start; |
| 4460 | bool pointers_to_new_space_found = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4461 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4462 | while (slot_address < end) { |
| 4463 | Object** slot = reinterpret_cast<Object**>(slot_address); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4464 | if (heap->InNewSpace(*slot)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4465 | ASSERT((*slot)->IsHeapObject()); |
| 4466 | copy_object_func(reinterpret_cast<HeapObject**>(slot)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4467 | if (heap->InNewSpace(*slot)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4468 | ASSERT((*slot)->IsHeapObject()); |
| 4469 | pointers_to_new_space_found = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4470 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4471 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4472 | slot_address += kPointerSize; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4473 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4474 | return pointers_to_new_space_found; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4475 | } |
| 4476 | |
| 4477 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4478 | // Compute start address of the first map following given addr. |
| 4479 | static inline Address MapStartAlign(Address addr) { |
| 4480 | Address page = Page::FromAddress(addr)->ObjectAreaStart(); |
| 4481 | return page + (((addr - page) + (Map::kSize - 1)) / Map::kSize * Map::kSize); |
| 4482 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4483 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4484 | |
| 4485 | // Compute end address of the first map preceding given addr. |
| 4486 | static inline Address MapEndAlign(Address addr) { |
| 4487 | Address page = Page::FromAllocationTop(addr)->ObjectAreaStart(); |
| 4488 | return page + ((addr - page) / Map::kSize * Map::kSize); |
| 4489 | } |
| 4490 | |
| 4491 | |
| 4492 | static bool IteratePointersInDirtyMaps(Address start, |
| 4493 | Address end, |
| 4494 | ObjectSlotCallback copy_object_func) { |
| 4495 | ASSERT(MapStartAlign(start) == start); |
| 4496 | ASSERT(MapEndAlign(end) == end); |
| 4497 | |
| 4498 | Address map_address = start; |
| 4499 | bool pointers_to_new_space_found = false; |
| 4500 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4501 | Heap* heap = HEAP; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4502 | while (map_address < end) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4503 | ASSERT(!heap->InNewSpace(Memory::Object_at(map_address))); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4504 | ASSERT(Memory::Object_at(map_address)->IsMap()); |
| 4505 | |
| 4506 | Address pointer_fields_start = map_address + Map::kPointerFieldsBeginOffset; |
| 4507 | Address pointer_fields_end = map_address + Map::kPointerFieldsEndOffset; |
| 4508 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4509 | if (Heap::IteratePointersInDirtyRegion(heap, |
| 4510 | pointer_fields_start, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4511 | pointer_fields_end, |
| 4512 | copy_object_func)) { |
| 4513 | pointers_to_new_space_found = true; |
| 4514 | } |
| 4515 | |
| 4516 | map_address += Map::kSize; |
| 4517 | } |
| 4518 | |
| 4519 | return pointers_to_new_space_found; |
| 4520 | } |
| 4521 | |
| 4522 | |
| 4523 | bool Heap::IteratePointersInDirtyMapsRegion( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4524 | Heap* heap, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4525 | Address start, |
| 4526 | Address end, |
| 4527 | ObjectSlotCallback copy_object_func) { |
| 4528 | Address map_aligned_start = MapStartAlign(start); |
| 4529 | Address map_aligned_end = MapEndAlign(end); |
| 4530 | |
| 4531 | bool contains_pointers_to_new_space = false; |
| 4532 | |
| 4533 | if (map_aligned_start != start) { |
| 4534 | Address prev_map = map_aligned_start - Map::kSize; |
| 4535 | ASSERT(Memory::Object_at(prev_map)->IsMap()); |
| 4536 | |
| 4537 | Address pointer_fields_start = |
| 4538 | Max(start, prev_map + Map::kPointerFieldsBeginOffset); |
| 4539 | |
| 4540 | Address pointer_fields_end = |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4541 | Min(prev_map + Map::kPointerFieldsEndOffset, end); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4542 | |
| 4543 | contains_pointers_to_new_space = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4544 | IteratePointersInDirtyRegion(heap, |
| 4545 | pointer_fields_start, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4546 | pointer_fields_end, |
| 4547 | copy_object_func) |
| 4548 | || contains_pointers_to_new_space; |
| 4549 | } |
| 4550 | |
| 4551 | contains_pointers_to_new_space = |
| 4552 | IteratePointersInDirtyMaps(map_aligned_start, |
| 4553 | map_aligned_end, |
| 4554 | copy_object_func) |
| 4555 | || contains_pointers_to_new_space; |
| 4556 | |
| 4557 | if (map_aligned_end != end) { |
| 4558 | ASSERT(Memory::Object_at(map_aligned_end)->IsMap()); |
| 4559 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4560 | Address pointer_fields_start = |
| 4561 | map_aligned_end + Map::kPointerFieldsBeginOffset; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4562 | |
| 4563 | Address pointer_fields_end = |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4564 | Min(end, map_aligned_end + Map::kPointerFieldsEndOffset); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4565 | |
| 4566 | contains_pointers_to_new_space = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4567 | IteratePointersInDirtyRegion(heap, |
| 4568 | pointer_fields_start, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4569 | pointer_fields_end, |
| 4570 | copy_object_func) |
| 4571 | || contains_pointers_to_new_space; |
| 4572 | } |
| 4573 | |
| 4574 | return contains_pointers_to_new_space; |
| 4575 | } |
| 4576 | |
| 4577 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4578 | void Heap::IterateAndMarkPointersToFromSpace(Address start, |
| 4579 | Address end, |
| 4580 | ObjectSlotCallback callback) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4581 | Address slot_address = start; |
| 4582 | Page* page = Page::FromAddress(start); |
| 4583 | |
| 4584 | uint32_t marks = page->GetRegionMarks(); |
| 4585 | |
| 4586 | while (slot_address < end) { |
| 4587 | Object** slot = reinterpret_cast<Object**>(slot_address); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4588 | if (InFromSpace(*slot)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4589 | ASSERT((*slot)->IsHeapObject()); |
| 4590 | callback(reinterpret_cast<HeapObject**>(slot)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4591 | if (InNewSpace(*slot)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4592 | ASSERT((*slot)->IsHeapObject()); |
| 4593 | marks |= page->GetRegionMaskForAddress(slot_address); |
| 4594 | } |
| 4595 | } |
| 4596 | slot_address += kPointerSize; |
| 4597 | } |
| 4598 | |
| 4599 | page->SetRegionMarks(marks); |
| 4600 | } |
| 4601 | |
| 4602 | |
| 4603 | uint32_t Heap::IterateDirtyRegions( |
| 4604 | uint32_t marks, |
| 4605 | Address area_start, |
| 4606 | Address area_end, |
| 4607 | DirtyRegionCallback visit_dirty_region, |
| 4608 | ObjectSlotCallback copy_object_func) { |
| 4609 | uint32_t newmarks = 0; |
| 4610 | uint32_t mask = 1; |
| 4611 | |
| 4612 | if (area_start >= area_end) { |
| 4613 | return newmarks; |
| 4614 | } |
| 4615 | |
| 4616 | Address region_start = area_start; |
| 4617 | |
| 4618 | // area_start does not necessarily coincide with start of the first region. |
| 4619 | // Thus to calculate the beginning of the next region we have to align |
| 4620 | // area_start by Page::kRegionSize. |
| 4621 | Address second_region = |
| 4622 | reinterpret_cast<Address>( |
| 4623 | reinterpret_cast<intptr_t>(area_start + Page::kRegionSize) & |
| 4624 | ~Page::kRegionAlignmentMask); |
| 4625 | |
| 4626 | // Next region might be beyond area_end. |
| 4627 | Address region_end = Min(second_region, area_end); |
| 4628 | |
| 4629 | if (marks & mask) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4630 | if (visit_dirty_region(this, region_start, region_end, copy_object_func)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4631 | newmarks |= mask; |
| 4632 | } |
| 4633 | } |
| 4634 | mask <<= 1; |
| 4635 | |
| 4636 | // Iterate subsequent regions which fully lay inside [area_start, area_end[. |
| 4637 | region_start = region_end; |
| 4638 | region_end = region_start + Page::kRegionSize; |
| 4639 | |
| 4640 | while (region_end <= area_end) { |
| 4641 | if (marks & mask) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4642 | if (visit_dirty_region(this, |
| 4643 | region_start, |
| 4644 | region_end, |
| 4645 | copy_object_func)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4646 | newmarks |= mask; |
| 4647 | } |
| 4648 | } |
| 4649 | |
| 4650 | region_start = region_end; |
| 4651 | region_end = region_start + Page::kRegionSize; |
| 4652 | |
| 4653 | mask <<= 1; |
| 4654 | } |
| 4655 | |
| 4656 | if (region_start != area_end) { |
| 4657 | // A small piece of area left uniterated because area_end does not coincide |
| 4658 | // with region end. Check whether region covering last part of area is |
| 4659 | // dirty. |
| 4660 | if (marks & mask) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4661 | if (visit_dirty_region(this, region_start, area_end, copy_object_func)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4662 | newmarks |= mask; |
| 4663 | } |
| 4664 | } |
| 4665 | } |
| 4666 | |
| 4667 | return newmarks; |
| 4668 | } |
| 4669 | |
| 4670 | |
| 4671 | |
| 4672 | void Heap::IterateDirtyRegions( |
| 4673 | PagedSpace* space, |
| 4674 | DirtyRegionCallback visit_dirty_region, |
| 4675 | ObjectSlotCallback copy_object_func, |
| 4676 | ExpectedPageWatermarkState expected_page_watermark_state) { |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 4677 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4678 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4679 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4680 | while (it.has_next()) { |
| 4681 | Page* page = it.next(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4682 | uint32_t marks = page->GetRegionMarks(); |
| 4683 | |
| 4684 | if (marks != Page::kAllRegionsCleanMarks) { |
| 4685 | Address start = page->ObjectAreaStart(); |
| 4686 | |
| 4687 | // Do not try to visit pointers beyond page allocation watermark. |
| 4688 | // Page can contain garbage pointers there. |
| 4689 | Address end; |
| 4690 | |
| 4691 | if ((expected_page_watermark_state == WATERMARK_SHOULD_BE_VALID) || |
| 4692 | page->IsWatermarkValid()) { |
| 4693 | end = page->AllocationWatermark(); |
| 4694 | } else { |
| 4695 | end = page->CachedAllocationWatermark(); |
| 4696 | } |
| 4697 | |
| 4698 | ASSERT(space == old_pointer_space_ || |
| 4699 | (space == map_space_ && |
| 4700 | ((page->ObjectAreaStart() - end) % Map::kSize == 0))); |
| 4701 | |
| 4702 | page->SetRegionMarks(IterateDirtyRegions(marks, |
| 4703 | start, |
| 4704 | end, |
| 4705 | visit_dirty_region, |
| 4706 | copy_object_func)); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 4707 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4708 | |
| 4709 | // Mark page watermark as invalid to maintain watermark validity invariant. |
| 4710 | // See Page::FlipMeaningOfInvalidatedWatermarkFlag() for details. |
| 4711 | page->InvalidateWatermark(true); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4712 | } |
| 4713 | } |
| 4714 | |
| 4715 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4716 | void Heap::IterateRoots(ObjectVisitor* v, VisitMode mode) { |
| 4717 | IterateStrongRoots(v, mode); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4718 | IterateWeakRoots(v, mode); |
| 4719 | } |
| 4720 | |
| 4721 | |
| 4722 | void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4723 | v->VisitPointer(reinterpret_cast<Object**>(&roots_[kSymbolTableRootIndex])); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4724 | v->Synchronize("symbol_table"); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 4725 | if (mode != VISIT_ALL_IN_SCAVENGE && |
| 4726 | mode != VISIT_ALL_IN_SWEEP_NEWSPACE) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4727 | // Scavenge collections have special processing for this. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4728 | external_string_table_.Iterate(v); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4729 | } |
| 4730 | v->Synchronize("external_string_table"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4731 | } |
| 4732 | |
| 4733 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4734 | void Heap::IterateStrongRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4735 | v->VisitPointers(&roots_[0], &roots_[kStrongRootListLength]); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4736 | v->Synchronize("strong_root_list"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4737 | |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 4738 | v->VisitPointer(BitCast<Object**>(&hidden_symbol_)); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4739 | v->Synchronize("symbol"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4740 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4741 | isolate_->bootstrapper()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4742 | v->Synchronize("bootstrapper"); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4743 | isolate_->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4744 | v->Synchronize("top"); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4745 | Relocatable::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4746 | v->Synchronize("relocatable"); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 4747 | |
| 4748 | #ifdef ENABLE_DEBUGGER_SUPPORT |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4749 | isolate_->debug()->Iterate(v); |
ricow@chromium.org | 4f693d6 | 2011-07-04 14:01:31 +0000 | [diff] [blame] | 4750 | if (isolate_->deoptimizer_data() != NULL) { |
| 4751 | isolate_->deoptimizer_data()->Iterate(v); |
| 4752 | } |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 4753 | #endif |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4754 | v->Synchronize("debug"); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4755 | isolate_->compilation_cache()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4756 | v->Synchronize("compilationcache"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4757 | |
| 4758 | // Iterate over local handles in handle scopes. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4759 | isolate_->handle_scope_implementer()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4760 | v->Synchronize("handlescope"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4761 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4762 | // Iterate over the builtin code objects and code stubs in the |
| 4763 | // heap. Note that it is not necessary to iterate over code objects |
| 4764 | // on scavenge collections. |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 4765 | if (mode != VISIT_ALL_IN_SCAVENGE && |
| 4766 | mode != VISIT_ALL_IN_SWEEP_NEWSPACE) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4767 | isolate_->builtins()->IterateBuiltins(v); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4768 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4769 | v->Synchronize("builtins"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4770 | |
| 4771 | // Iterate over global handles. |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 4772 | switch (mode) { |
| 4773 | case VISIT_ONLY_STRONG: |
| 4774 | isolate_->global_handles()->IterateStrongRoots(v); |
| 4775 | break; |
| 4776 | case VISIT_ALL_IN_SCAVENGE: |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 4777 | isolate_->global_handles()->IterateNewSpaceStrongAndDependentRoots(v); |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 4778 | break; |
| 4779 | case VISIT_ALL_IN_SWEEP_NEWSPACE: |
| 4780 | case VISIT_ALL: |
| 4781 | isolate_->global_handles()->IterateAllRoots(v); |
| 4782 | break; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4783 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4784 | v->Synchronize("globalhandles"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4785 | |
| 4786 | // Iterate over pointers being held by inactive threads. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4787 | isolate_->thread_manager()->Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4788 | v->Synchronize("threadmanager"); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4789 | |
| 4790 | // Iterate over the pointers the Serialization/Deserialization code is |
| 4791 | // holding. |
| 4792 | // During garbage collection this keeps the partial snapshot cache alive. |
| 4793 | // During deserialization of the startup snapshot this creates the partial |
| 4794 | // snapshot cache and deserializes the objects it refers to. During |
| 4795 | // serialization this does nothing, since the partial snapshot cache is |
| 4796 | // empty. However the next thing we do is create the partial snapshot, |
| 4797 | // filling up the partial snapshot cache with objects it needs as we go. |
| 4798 | SerializerDeserializer::Iterate(v); |
| 4799 | // We don't do a v->Synchronize call here, because in debug mode that will |
| 4800 | // output a flag to the snapshot. However at this point the serializer and |
| 4801 | // deserializer are deliberately a little unsynchronized (see above) so the |
| 4802 | // checking of the sync flag in the snapshot would fail. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4803 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4804 | |
| 4805 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4806 | // TODO(1236194): Since the heap size is configurable on the command line |
| 4807 | // and through the API, we should gracefully handle the case that the heap |
| 4808 | // size is not big enough to fit all the initial objects. |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 4809 | bool Heap::ConfigureHeap(int max_semispace_size, |
| 4810 | int max_old_gen_size, |
| 4811 | int max_executable_size) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4812 | if (HasBeenSetup()) return false; |
| 4813 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4814 | if (max_semispace_size > 0) max_semispace_size_ = max_semispace_size; |
| 4815 | |
| 4816 | if (Snapshot::IsEnabled()) { |
| 4817 | // If we are using a snapshot we always reserve the default amount |
| 4818 | // of memory for each semispace because code in the snapshot has |
| 4819 | // write-barrier code that relies on the size and alignment of new |
| 4820 | // space. We therefore cannot use a larger max semispace size |
| 4821 | // than the default reserved semispace size. |
| 4822 | if (max_semispace_size_ > reserved_semispace_size_) { |
| 4823 | max_semispace_size_ = reserved_semispace_size_; |
| 4824 | } |
| 4825 | } else { |
| 4826 | // If we are not using snapshots we reserve space for the actual |
| 4827 | // max semispace size. |
| 4828 | reserved_semispace_size_ = max_semispace_size_; |
| 4829 | } |
| 4830 | |
| 4831 | 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] | 4832 | if (max_executable_size > 0) { |
| 4833 | max_executable_size_ = RoundUp(max_executable_size, Page::kPageSize); |
| 4834 | } |
| 4835 | |
| 4836 | // The max executable size must be less than or equal to the max old |
| 4837 | // generation size. |
| 4838 | if (max_executable_size_ > max_old_generation_size_) { |
| 4839 | max_executable_size_ = max_old_generation_size_; |
| 4840 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4841 | |
| 4842 | // The new space size must be a power of two to support single-bit testing |
| 4843 | // for containment. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4844 | max_semispace_size_ = RoundUpToPowerOf2(max_semispace_size_); |
| 4845 | reserved_semispace_size_ = RoundUpToPowerOf2(reserved_semispace_size_); |
| 4846 | initial_semispace_size_ = Min(initial_semispace_size_, max_semispace_size_); |
| 4847 | external_allocation_limit_ = 10 * max_semispace_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4848 | |
| 4849 | // The old generation is paged. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4850 | max_old_generation_size_ = RoundUp(max_old_generation_size_, Page::kPageSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4851 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4852 | configured_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4853 | return true; |
| 4854 | } |
| 4855 | |
| 4856 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4857 | bool Heap::ConfigureHeapDefault() { |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 4858 | return ConfigureHeap(FLAG_max_new_space_size / 2 * KB, |
| 4859 | FLAG_max_old_space_size * MB, |
| 4860 | FLAG_max_executable_size * MB); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4861 | } |
| 4862 | |
| 4863 | |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4864 | void Heap::RecordStats(HeapStats* stats, bool take_snapshot) { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 4865 | *stats->start_marker = HeapStats::kStartMarker; |
| 4866 | *stats->end_marker = HeapStats::kEndMarker; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4867 | *stats->new_space_size = new_space_.SizeAsInt(); |
| 4868 | *stats->new_space_capacity = static_cast<int>(new_space_.Capacity()); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4869 | *stats->old_pointer_space_size = old_pointer_space_->Size(); |
| 4870 | *stats->old_pointer_space_capacity = old_pointer_space_->Capacity(); |
| 4871 | *stats->old_data_space_size = old_data_space_->Size(); |
| 4872 | *stats->old_data_space_capacity = old_data_space_->Capacity(); |
| 4873 | *stats->code_space_size = code_space_->Size(); |
| 4874 | *stats->code_space_capacity = code_space_->Capacity(); |
| 4875 | *stats->map_space_size = map_space_->Size(); |
| 4876 | *stats->map_space_capacity = map_space_->Capacity(); |
| 4877 | *stats->cell_space_size = cell_space_->Size(); |
| 4878 | *stats->cell_space_capacity = cell_space_->Capacity(); |
| 4879 | *stats->lo_space_size = lo_space_->Size(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4880 | isolate_->global_handles()->RecordStats(stats); |
| 4881 | *stats->memory_allocator_size = isolate()->memory_allocator()->Size(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4882 | *stats->memory_allocator_capacity = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4883 | isolate()->memory_allocator()->Size() + |
| 4884 | isolate()->memory_allocator()->Available(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 4885 | *stats->os_error = OS::GetLastError(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4886 | isolate()->memory_allocator()->Available(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4887 | if (take_snapshot) { |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 4888 | HeapIterator iterator(HeapIterator::kFilterFreeListNodes); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4889 | for (HeapObject* obj = iterator.next(); |
| 4890 | obj != NULL; |
| 4891 | obj = iterator.next()) { |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4892 | InstanceType type = obj->map()->instance_type(); |
| 4893 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 4894 | stats->objects_per_type[type]++; |
| 4895 | stats->size_per_type[type] += obj->Size(); |
| 4896 | } |
| 4897 | } |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 4898 | } |
| 4899 | |
| 4900 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4901 | intptr_t Heap::PromotedSpaceSize() { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4902 | return old_pointer_space_->Size() |
| 4903 | + old_data_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4904 | + code_space_->Size() |
| 4905 | + map_space_->Size() |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4906 | + cell_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4907 | + lo_space_->Size(); |
| 4908 | } |
| 4909 | |
| 4910 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4911 | int Heap::PromotedExternalMemorySize() { |
| 4912 | if (amount_of_external_allocated_memory_ |
| 4913 | <= amount_of_external_allocated_memory_at_last_global_gc_) return 0; |
| 4914 | return amount_of_external_allocated_memory_ |
| 4915 | - amount_of_external_allocated_memory_at_last_global_gc_; |
| 4916 | } |
| 4917 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 4918 | #ifdef DEBUG |
| 4919 | |
| 4920 | // Tags 0, 1, and 3 are used. Use 2 for marking visited HeapObject. |
| 4921 | static const int kMarkTag = 2; |
| 4922 | |
| 4923 | |
| 4924 | class HeapDebugUtils { |
| 4925 | public: |
| 4926 | explicit HeapDebugUtils(Heap* heap) |
| 4927 | : search_for_any_global_(false), |
| 4928 | search_target_(NULL), |
| 4929 | found_target_(false), |
| 4930 | object_stack_(20), |
| 4931 | heap_(heap) { |
| 4932 | } |
| 4933 | |
| 4934 | class MarkObjectVisitor : public ObjectVisitor { |
| 4935 | public: |
| 4936 | explicit MarkObjectVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 4937 | |
| 4938 | void VisitPointers(Object** start, Object** end) { |
| 4939 | // Copy all HeapObject pointers in [start, end) |
| 4940 | for (Object** p = start; p < end; p++) { |
| 4941 | if ((*p)->IsHeapObject()) |
| 4942 | utils_->MarkObjectRecursively(p); |
| 4943 | } |
| 4944 | } |
| 4945 | |
| 4946 | HeapDebugUtils* utils_; |
| 4947 | }; |
| 4948 | |
| 4949 | void MarkObjectRecursively(Object** p) { |
| 4950 | if (!(*p)->IsHeapObject()) return; |
| 4951 | |
| 4952 | HeapObject* obj = HeapObject::cast(*p); |
| 4953 | |
| 4954 | Object* map = obj->map(); |
| 4955 | |
| 4956 | if (!map->IsHeapObject()) return; // visited before |
| 4957 | |
| 4958 | if (found_target_) return; // stop if target found |
| 4959 | object_stack_.Add(obj); |
| 4960 | if ((search_for_any_global_ && obj->IsJSGlobalObject()) || |
| 4961 | (!search_for_any_global_ && (obj == search_target_))) { |
| 4962 | found_target_ = true; |
| 4963 | return; |
| 4964 | } |
| 4965 | |
| 4966 | // not visited yet |
| 4967 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 4968 | |
| 4969 | Address map_addr = map_p->address(); |
| 4970 | |
| 4971 | obj->set_map(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
| 4972 | |
| 4973 | MarkObjectRecursively(&map); |
| 4974 | |
| 4975 | MarkObjectVisitor mark_visitor(this); |
| 4976 | |
| 4977 | obj->IterateBody(map_p->instance_type(), obj->SizeFromMap(map_p), |
| 4978 | &mark_visitor); |
| 4979 | |
| 4980 | if (!found_target_) // don't pop if found the target |
| 4981 | object_stack_.RemoveLast(); |
| 4982 | } |
| 4983 | |
| 4984 | |
| 4985 | class UnmarkObjectVisitor : public ObjectVisitor { |
| 4986 | public: |
| 4987 | explicit UnmarkObjectVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 4988 | |
| 4989 | void VisitPointers(Object** start, Object** end) { |
| 4990 | // Copy all HeapObject pointers in [start, end) |
| 4991 | for (Object** p = start; p < end; p++) { |
| 4992 | if ((*p)->IsHeapObject()) |
| 4993 | utils_->UnmarkObjectRecursively(p); |
| 4994 | } |
| 4995 | } |
| 4996 | |
| 4997 | HeapDebugUtils* utils_; |
| 4998 | }; |
| 4999 | |
| 5000 | |
| 5001 | void UnmarkObjectRecursively(Object** p) { |
| 5002 | if (!(*p)->IsHeapObject()) return; |
| 5003 | |
| 5004 | HeapObject* obj = HeapObject::cast(*p); |
| 5005 | |
| 5006 | Object* map = obj->map(); |
| 5007 | |
| 5008 | if (map->IsHeapObject()) return; // unmarked already |
| 5009 | |
| 5010 | Address map_addr = reinterpret_cast<Address>(map); |
| 5011 | |
| 5012 | map_addr -= kMarkTag; |
| 5013 | |
| 5014 | ASSERT_TAG_ALIGNED(map_addr); |
| 5015 | |
| 5016 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 5017 | |
| 5018 | obj->set_map(reinterpret_cast<Map*>(map_p)); |
| 5019 | |
| 5020 | UnmarkObjectRecursively(reinterpret_cast<Object**>(&map_p)); |
| 5021 | |
| 5022 | UnmarkObjectVisitor unmark_visitor(this); |
| 5023 | |
| 5024 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 5025 | obj->SizeFromMap(Map::cast(map_p)), |
| 5026 | &unmark_visitor); |
| 5027 | } |
| 5028 | |
| 5029 | |
| 5030 | void MarkRootObjectRecursively(Object** root) { |
| 5031 | if (search_for_any_global_) { |
| 5032 | ASSERT(search_target_ == NULL); |
| 5033 | } else { |
| 5034 | ASSERT(search_target_->IsHeapObject()); |
| 5035 | } |
| 5036 | found_target_ = false; |
| 5037 | object_stack_.Clear(); |
| 5038 | |
| 5039 | MarkObjectRecursively(root); |
| 5040 | UnmarkObjectRecursively(root); |
| 5041 | |
| 5042 | if (found_target_) { |
| 5043 | PrintF("=====================================\n"); |
| 5044 | PrintF("==== Path to object ====\n"); |
| 5045 | PrintF("=====================================\n\n"); |
| 5046 | |
| 5047 | ASSERT(!object_stack_.is_empty()); |
| 5048 | for (int i = 0; i < object_stack_.length(); i++) { |
| 5049 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
| 5050 | Object* obj = object_stack_[i]; |
| 5051 | obj->Print(); |
| 5052 | } |
| 5053 | PrintF("=====================================\n"); |
| 5054 | } |
| 5055 | } |
| 5056 | |
| 5057 | // Helper class for visiting HeapObjects recursively. |
| 5058 | class MarkRootVisitor: public ObjectVisitor { |
| 5059 | public: |
| 5060 | explicit MarkRootVisitor(HeapDebugUtils* utils) : utils_(utils) { } |
| 5061 | |
| 5062 | void VisitPointers(Object** start, Object** end) { |
| 5063 | // Visit all HeapObject pointers in [start, end) |
| 5064 | for (Object** p = start; p < end; p++) { |
| 5065 | if ((*p)->IsHeapObject()) |
| 5066 | utils_->MarkRootObjectRecursively(p); |
| 5067 | } |
| 5068 | } |
| 5069 | |
| 5070 | HeapDebugUtils* utils_; |
| 5071 | }; |
| 5072 | |
| 5073 | bool search_for_any_global_; |
| 5074 | Object* search_target_; |
| 5075 | bool found_target_; |
| 5076 | List<Object*> object_stack_; |
| 5077 | Heap* heap_; |
| 5078 | |
| 5079 | friend class Heap; |
| 5080 | }; |
| 5081 | |
| 5082 | #endif |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5083 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5084 | bool Heap::Setup(bool create_heap_objects) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5085 | #ifdef DEBUG |
| 5086 | debug_utils_ = new HeapDebugUtils(this); |
| 5087 | #endif |
| 5088 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5089 | // Initialize heap spaces and initial maps and objects. Whenever something |
| 5090 | // goes wrong, just return false. The caller should check the results and |
| 5091 | // call Heap::TearDown() to release allocated memory. |
| 5092 | // |
| 5093 | // If the heap is not yet configured (eg, through the API), configure it. |
| 5094 | // Configuration is based on the flags new-space-size (really the semispace |
| 5095 | // size) and old-space-size if set or the initial values of semispace_size_ |
| 5096 | // and old_generation_size_ otherwise. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5097 | if (!configured_) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5098 | if (!ConfigureHeapDefault()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5099 | } |
| 5100 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5101 | gc_initializer_mutex->Lock(); |
| 5102 | static bool initialized_gc = false; |
| 5103 | if (!initialized_gc) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 5104 | initialized_gc = true; |
| 5105 | InitializeScavengingVisitorsTables(); |
| 5106 | NewSpaceScavenger::Initialize(); |
| 5107 | MarkCompactCollector::Initialize(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5108 | } |
| 5109 | gc_initializer_mutex->Unlock(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5110 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 5111 | MarkMapPointersAsEncoded(false); |
| 5112 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5113 | // Setup memory allocator and reserve a chunk of memory for new |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5114 | // space. The chunk is double the size of the requested reserved |
| 5115 | // new space size to ensure that we can find a pair of semispaces that |
| 5116 | // are contiguous and aligned to their size. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5117 | if (!isolate_->memory_allocator()->Setup(MaxReserved(), MaxExecutableSize())) |
| 5118 | return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5119 | void* chunk = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5120 | isolate_->memory_allocator()->ReserveInitialChunk( |
| 5121 | 4 * reserved_semispace_size_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5122 | if (chunk == NULL) return false; |
| 5123 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5124 | // Align the pair of semispaces to their size, which must be a power |
| 5125 | // of 2. |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5126 | Address new_space_start = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 5127 | RoundUp(reinterpret_cast<byte*>(chunk), 2 * reserved_semispace_size_); |
| 5128 | if (!new_space_.Setup(new_space_start, 2 * reserved_semispace_size_)) { |
| 5129 | return false; |
| 5130 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5131 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5132 | // Initialize old pointer space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5133 | old_pointer_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5134 | new OldSpace(this, |
| 5135 | max_old_generation_size_, |
| 5136 | OLD_POINTER_SPACE, |
| 5137 | NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5138 | if (old_pointer_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5139 | if (!old_pointer_space_->Setup(NULL, 0)) return false; |
| 5140 | |
| 5141 | // Initialize old data space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5142 | old_data_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5143 | new OldSpace(this, |
| 5144 | max_old_generation_size_, |
| 5145 | OLD_DATA_SPACE, |
| 5146 | NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5147 | if (old_data_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5148 | if (!old_data_space_->Setup(NULL, 0)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5149 | |
| 5150 | // Initialize the code space, set its maximum capacity to the old |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5151 | // generation size. It needs executable memory. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5152 | // On 64-bit platform(s), we put all code objects in a 2 GB range of |
| 5153 | // virtual address space, so that they can call each other with near calls. |
| 5154 | if (code_range_size_ > 0) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5155 | if (!isolate_->code_range()->Setup(code_range_size_)) { |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 5156 | return false; |
| 5157 | } |
| 5158 | } |
| 5159 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5160 | code_space_ = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5161 | new OldSpace(this, max_old_generation_size_, CODE_SPACE, EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5162 | if (code_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 5163 | if (!code_space_->Setup(NULL, 0)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5164 | |
| 5165 | // Initialize map space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5166 | map_space_ = new MapSpace(this, FLAG_use_big_map_space |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 5167 | ? max_old_generation_size_ |
kasperl@chromium.org | eac059f | 2010-01-25 11:02:06 +0000 | [diff] [blame] | 5168 | : MapSpace::kMaxMapPageIndex * Page::kPageSize, |
| 5169 | FLAG_max_map_space_pages, |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 5170 | MAP_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5171 | if (map_space_ == NULL) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5172 | if (!map_space_->Setup(NULL, 0)) return false; |
| 5173 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5174 | // Initialize global property cell space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5175 | cell_space_ = new CellSpace(this, max_old_generation_size_, CELL_SPACE); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5176 | if (cell_space_ == NULL) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5177 | if (!cell_space_->Setup(NULL, 0)) return false; |
| 5178 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5179 | // The large object code space may contain code or data. We set the memory |
| 5180 | // to be non-executable here for safety, but this means we need to enable it |
| 5181 | // explicitly when allocating large code objects. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5182 | lo_space_ = new LargeObjectSpace(this, LO_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5183 | if (lo_space_ == NULL) return false; |
| 5184 | if (!lo_space_->Setup()) return false; |
| 5185 | |
| 5186 | if (create_heap_objects) { |
| 5187 | // Create initial maps. |
| 5188 | if (!CreateInitialMaps()) return false; |
| 5189 | if (!CreateApiObjects()) return false; |
| 5190 | |
| 5191 | // Create initial objects |
| 5192 | if (!CreateInitialObjects()) return false; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 5193 | |
| 5194 | global_contexts_list_ = undefined_value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5195 | } |
| 5196 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5197 | LOG(isolate_, IntPtrTEvent("heap-capacity", Capacity())); |
| 5198 | LOG(isolate_, IntPtrTEvent("heap-available", Available())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5199 | |
| 5200 | return true; |
| 5201 | } |
| 5202 | |
| 5203 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5204 | void Heap::SetStackLimits() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5205 | ASSERT(isolate_ != NULL); |
| 5206 | ASSERT(isolate_ == isolate()); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5207 | // On 64 bit machines, pointers are generally out of range of Smis. We write |
| 5208 | // something that looks like an out of range Smi to the GC. |
| 5209 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5210 | // Set up the special root array entries containing the stack limits. |
| 5211 | // 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] | 5212 | roots_[kStackLimitRootIndex] = |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5213 | reinterpret_cast<Object*>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5214 | (isolate_->stack_guard()->jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 5215 | roots_[kRealStackLimitRootIndex] = |
| 5216 | reinterpret_cast<Object*>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5217 | (isolate_->stack_guard()->real_jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5218 | } |
| 5219 | |
| 5220 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5221 | void Heap::TearDown() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5222 | if (FLAG_print_cumulative_gc_stat) { |
| 5223 | PrintF("\n\n"); |
| 5224 | PrintF("gc_count=%d ", gc_count_); |
| 5225 | PrintF("mark_sweep_count=%d ", ms_count_); |
| 5226 | PrintF("mark_compact_count=%d ", mc_count_); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5227 | PrintF("max_gc_pause=%d ", get_max_gc_pause()); |
| 5228 | PrintF("min_in_mutator=%d ", get_min_in_mutator()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5229 | PrintF("max_alive_after_gc=%" V8_PTR_PREFIX "d ", |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5230 | get_max_alive_after_gc()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5231 | PrintF("\n\n"); |
| 5232 | } |
| 5233 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5234 | isolate_->global_handles()->TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5235 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5236 | external_string_table_.TearDown(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5237 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 5238 | new_space_.TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5239 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5240 | if (old_pointer_space_ != NULL) { |
| 5241 | old_pointer_space_->TearDown(); |
| 5242 | delete old_pointer_space_; |
| 5243 | old_pointer_space_ = NULL; |
| 5244 | } |
| 5245 | |
| 5246 | if (old_data_space_ != NULL) { |
| 5247 | old_data_space_->TearDown(); |
| 5248 | delete old_data_space_; |
| 5249 | old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5250 | } |
| 5251 | |
| 5252 | if (code_space_ != NULL) { |
| 5253 | code_space_->TearDown(); |
| 5254 | delete code_space_; |
| 5255 | code_space_ = NULL; |
| 5256 | } |
| 5257 | |
| 5258 | if (map_space_ != NULL) { |
| 5259 | map_space_->TearDown(); |
| 5260 | delete map_space_; |
| 5261 | map_space_ = NULL; |
| 5262 | } |
| 5263 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5264 | if (cell_space_ != NULL) { |
| 5265 | cell_space_->TearDown(); |
| 5266 | delete cell_space_; |
| 5267 | cell_space_ = NULL; |
| 5268 | } |
| 5269 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5270 | if (lo_space_ != NULL) { |
| 5271 | lo_space_->TearDown(); |
| 5272 | delete lo_space_; |
| 5273 | lo_space_ = NULL; |
| 5274 | } |
| 5275 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5276 | isolate_->memory_allocator()->TearDown(); |
| 5277 | |
| 5278 | #ifdef DEBUG |
| 5279 | delete debug_utils_; |
| 5280 | debug_utils_ = NULL; |
| 5281 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5282 | } |
| 5283 | |
| 5284 | |
| 5285 | void Heap::Shrink() { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5286 | // Try to shrink all paged spaces. |
| 5287 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5288 | for (PagedSpace* space = spaces.next(); space != NULL; space = spaces.next()) |
| 5289 | space->Shrink(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5290 | } |
| 5291 | |
| 5292 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 5293 | void Heap::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) { |
| 5294 | ASSERT(callback != NULL); |
| 5295 | GCPrologueCallbackPair pair(callback, gc_type); |
| 5296 | ASSERT(!gc_prologue_callbacks_.Contains(pair)); |
| 5297 | return gc_prologue_callbacks_.Add(pair); |
| 5298 | } |
| 5299 | |
| 5300 | |
| 5301 | void Heap::RemoveGCPrologueCallback(GCPrologueCallback callback) { |
| 5302 | ASSERT(callback != NULL); |
| 5303 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 5304 | if (gc_prologue_callbacks_[i].callback == callback) { |
| 5305 | gc_prologue_callbacks_.Remove(i); |
| 5306 | return; |
| 5307 | } |
| 5308 | } |
| 5309 | UNREACHABLE(); |
| 5310 | } |
| 5311 | |
| 5312 | |
| 5313 | void Heap::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) { |
| 5314 | ASSERT(callback != NULL); |
| 5315 | GCEpilogueCallbackPair pair(callback, gc_type); |
| 5316 | ASSERT(!gc_epilogue_callbacks_.Contains(pair)); |
| 5317 | return gc_epilogue_callbacks_.Add(pair); |
| 5318 | } |
| 5319 | |
| 5320 | |
| 5321 | void Heap::RemoveGCEpilogueCallback(GCEpilogueCallback callback) { |
| 5322 | ASSERT(callback != NULL); |
| 5323 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 5324 | if (gc_epilogue_callbacks_[i].callback == callback) { |
| 5325 | gc_epilogue_callbacks_.Remove(i); |
| 5326 | return; |
| 5327 | } |
| 5328 | } |
| 5329 | UNREACHABLE(); |
| 5330 | } |
| 5331 | |
| 5332 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5333 | #ifdef DEBUG |
| 5334 | |
| 5335 | class PrintHandleVisitor: public ObjectVisitor { |
| 5336 | public: |
| 5337 | void VisitPointers(Object** start, Object** end) { |
| 5338 | for (Object** p = start; p < end; p++) |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5339 | PrintF(" handle %p to %p\n", |
| 5340 | reinterpret_cast<void*>(p), |
| 5341 | reinterpret_cast<void*>(*p)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5342 | } |
| 5343 | }; |
| 5344 | |
| 5345 | void Heap::PrintHandles() { |
| 5346 | PrintF("Handles:\n"); |
| 5347 | PrintHandleVisitor v; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5348 | isolate_->handle_scope_implementer()->Iterate(&v); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5349 | } |
| 5350 | |
| 5351 | #endif |
| 5352 | |
| 5353 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5354 | Space* AllSpaces::next() { |
| 5355 | switch (counter_++) { |
| 5356 | case NEW_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5357 | return HEAP->new_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5358 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5359 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5360 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5361 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5362 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5363 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5364 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5365 | return HEAP->map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5366 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5367 | return HEAP->cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5368 | case LO_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5369 | return HEAP->lo_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5370 | default: |
| 5371 | return NULL; |
| 5372 | } |
| 5373 | } |
| 5374 | |
| 5375 | |
| 5376 | PagedSpace* PagedSpaces::next() { |
| 5377 | switch (counter_++) { |
| 5378 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5379 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5380 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5381 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5382 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5383 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5384 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5385 | return HEAP->map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5386 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5387 | return HEAP->cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5388 | default: |
| 5389 | return NULL; |
| 5390 | } |
| 5391 | } |
| 5392 | |
| 5393 | |
| 5394 | |
| 5395 | OldSpace* OldSpaces::next() { |
| 5396 | switch (counter_++) { |
| 5397 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5398 | return HEAP->old_pointer_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5399 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5400 | return HEAP->old_data_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5401 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5402 | return HEAP->code_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5403 | default: |
| 5404 | return NULL; |
| 5405 | } |
| 5406 | } |
| 5407 | |
| 5408 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5409 | SpaceIterator::SpaceIterator() |
| 5410 | : current_space_(FIRST_SPACE), |
| 5411 | iterator_(NULL), |
| 5412 | size_func_(NULL) { |
| 5413 | } |
| 5414 | |
| 5415 | |
| 5416 | SpaceIterator::SpaceIterator(HeapObjectCallback size_func) |
| 5417 | : current_space_(FIRST_SPACE), |
| 5418 | iterator_(NULL), |
| 5419 | size_func_(size_func) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5420 | } |
| 5421 | |
| 5422 | |
| 5423 | SpaceIterator::~SpaceIterator() { |
| 5424 | // Delete active iterator if any. |
| 5425 | delete iterator_; |
| 5426 | } |
| 5427 | |
| 5428 | |
| 5429 | bool SpaceIterator::has_next() { |
| 5430 | // Iterate until no more spaces. |
| 5431 | return current_space_ != LAST_SPACE; |
| 5432 | } |
| 5433 | |
| 5434 | |
| 5435 | ObjectIterator* SpaceIterator::next() { |
| 5436 | if (iterator_ != NULL) { |
| 5437 | delete iterator_; |
| 5438 | iterator_ = NULL; |
| 5439 | // Move to the next space |
| 5440 | current_space_++; |
| 5441 | if (current_space_ > LAST_SPACE) { |
| 5442 | return NULL; |
| 5443 | } |
| 5444 | } |
| 5445 | |
| 5446 | // Return iterator for the new current space. |
| 5447 | return CreateIterator(); |
| 5448 | } |
| 5449 | |
| 5450 | |
| 5451 | // Create an iterator for the space to iterate. |
| 5452 | ObjectIterator* SpaceIterator::CreateIterator() { |
| 5453 | ASSERT(iterator_ == NULL); |
| 5454 | |
| 5455 | switch (current_space_) { |
| 5456 | case NEW_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5457 | iterator_ = new SemiSpaceIterator(HEAP->new_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5458 | break; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5459 | case OLD_POINTER_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5460 | iterator_ = new HeapObjectIterator(HEAP->old_pointer_space(), size_func_); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 5461 | break; |
| 5462 | case OLD_DATA_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5463 | iterator_ = new HeapObjectIterator(HEAP->old_data_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5464 | break; |
| 5465 | case CODE_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5466 | iterator_ = new HeapObjectIterator(HEAP->code_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5467 | break; |
| 5468 | case MAP_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5469 | iterator_ = new HeapObjectIterator(HEAP->map_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5470 | break; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5471 | case CELL_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5472 | iterator_ = new HeapObjectIterator(HEAP->cell_space(), size_func_); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 5473 | break; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5474 | case LO_SPACE: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5475 | iterator_ = new LargeObjectIterator(HEAP->lo_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5476 | break; |
| 5477 | } |
| 5478 | |
| 5479 | // Return the newly allocated iterator; |
| 5480 | ASSERT(iterator_ != NULL); |
| 5481 | return iterator_; |
| 5482 | } |
| 5483 | |
| 5484 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5485 | class HeapObjectsFilter { |
| 5486 | public: |
| 5487 | virtual ~HeapObjectsFilter() {} |
| 5488 | virtual bool SkipObject(HeapObject* object) = 0; |
| 5489 | }; |
| 5490 | |
| 5491 | |
| 5492 | class FreeListNodesFilter : public HeapObjectsFilter { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5493 | public: |
| 5494 | FreeListNodesFilter() { |
| 5495 | MarkFreeListNodes(); |
| 5496 | } |
| 5497 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5498 | bool SkipObject(HeapObject* object) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5499 | if (object->IsMarked()) { |
| 5500 | object->ClearMark(); |
| 5501 | return true; |
| 5502 | } else { |
| 5503 | return false; |
| 5504 | } |
| 5505 | } |
| 5506 | |
| 5507 | private: |
| 5508 | void MarkFreeListNodes() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5509 | Heap* heap = HEAP; |
| 5510 | heap->old_pointer_space()->MarkFreeListNodes(); |
| 5511 | heap->old_data_space()->MarkFreeListNodes(); |
| 5512 | MarkCodeSpaceFreeListNodes(heap); |
| 5513 | heap->map_space()->MarkFreeListNodes(); |
| 5514 | heap->cell_space()->MarkFreeListNodes(); |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5515 | } |
| 5516 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5517 | void MarkCodeSpaceFreeListNodes(Heap* heap) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5518 | // For code space, using FreeListNode::IsFreeListNode is OK. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5519 | HeapObjectIterator iter(heap->code_space()); |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5520 | for (HeapObject* obj = iter.next_object(); |
| 5521 | obj != NULL; |
| 5522 | obj = iter.next_object()) { |
| 5523 | if (FreeListNode::IsFreeListNode(obj)) obj->SetMark(); |
| 5524 | } |
| 5525 | } |
| 5526 | |
| 5527 | AssertNoAllocation no_alloc; |
| 5528 | }; |
| 5529 | |
| 5530 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5531 | class UnreachableObjectsFilter : public HeapObjectsFilter { |
| 5532 | public: |
| 5533 | UnreachableObjectsFilter() { |
| 5534 | MarkUnreachableObjects(); |
| 5535 | } |
| 5536 | |
| 5537 | bool SkipObject(HeapObject* object) { |
| 5538 | if (object->IsMarked()) { |
| 5539 | object->ClearMark(); |
| 5540 | return true; |
| 5541 | } else { |
| 5542 | return false; |
| 5543 | } |
| 5544 | } |
| 5545 | |
| 5546 | private: |
| 5547 | class UnmarkingVisitor : public ObjectVisitor { |
| 5548 | public: |
| 5549 | UnmarkingVisitor() : list_(10) {} |
| 5550 | |
| 5551 | void VisitPointers(Object** start, Object** end) { |
| 5552 | for (Object** p = start; p < end; p++) { |
| 5553 | if (!(*p)->IsHeapObject()) continue; |
| 5554 | HeapObject* obj = HeapObject::cast(*p); |
| 5555 | if (obj->IsMarked()) { |
| 5556 | obj->ClearMark(); |
| 5557 | list_.Add(obj); |
| 5558 | } |
| 5559 | } |
| 5560 | } |
| 5561 | |
| 5562 | bool can_process() { return !list_.is_empty(); } |
| 5563 | |
| 5564 | void ProcessNext() { |
| 5565 | HeapObject* obj = list_.RemoveLast(); |
| 5566 | obj->Iterate(this); |
| 5567 | } |
| 5568 | |
| 5569 | private: |
| 5570 | List<HeapObject*> list_; |
| 5571 | }; |
| 5572 | |
| 5573 | void MarkUnreachableObjects() { |
| 5574 | HeapIterator iterator; |
| 5575 | for (HeapObject* obj = iterator.next(); |
| 5576 | obj != NULL; |
| 5577 | obj = iterator.next()) { |
| 5578 | obj->SetMark(); |
| 5579 | } |
| 5580 | UnmarkingVisitor visitor; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5581 | HEAP->IterateRoots(&visitor, VISIT_ALL); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5582 | while (visitor.can_process()) |
| 5583 | visitor.ProcessNext(); |
| 5584 | } |
| 5585 | |
| 5586 | AssertNoAllocation no_alloc; |
| 5587 | }; |
| 5588 | |
| 5589 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5590 | HeapIterator::HeapIterator() |
| 5591 | : filtering_(HeapIterator::kNoFiltering), |
| 5592 | filter_(NULL) { |
| 5593 | Init(); |
| 5594 | } |
| 5595 | |
| 5596 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5597 | HeapIterator::HeapIterator(HeapIterator::HeapObjectsFiltering filtering) |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5598 | : filtering_(filtering), |
| 5599 | filter_(NULL) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5600 | Init(); |
| 5601 | } |
| 5602 | |
| 5603 | |
| 5604 | HeapIterator::~HeapIterator() { |
| 5605 | Shutdown(); |
| 5606 | } |
| 5607 | |
| 5608 | |
| 5609 | void HeapIterator::Init() { |
| 5610 | // Start the iteration. |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5611 | space_iterator_ = filtering_ == kNoFiltering ? new SpaceIterator : |
| 5612 | new SpaceIterator(MarkCompactCollector::SizeOfMarkedObject); |
| 5613 | switch (filtering_) { |
| 5614 | case kFilterFreeListNodes: |
| 5615 | filter_ = new FreeListNodesFilter; |
| 5616 | break; |
| 5617 | case kFilterUnreachable: |
| 5618 | filter_ = new UnreachableObjectsFilter; |
| 5619 | break; |
| 5620 | default: |
| 5621 | break; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5622 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5623 | object_iterator_ = space_iterator_->next(); |
| 5624 | } |
| 5625 | |
| 5626 | |
| 5627 | void HeapIterator::Shutdown() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5628 | #ifdef DEBUG |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5629 | // Assert that in filtering mode we have iterated through all |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5630 | // objects. Otherwise, heap will be left in an inconsistent state. |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5631 | if (filtering_ != kNoFiltering) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5632 | ASSERT(object_iterator_ == NULL); |
| 5633 | } |
| 5634 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5635 | // Make sure the last iterator is deallocated. |
| 5636 | delete space_iterator_; |
| 5637 | space_iterator_ = NULL; |
| 5638 | object_iterator_ = NULL; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5639 | delete filter_; |
| 5640 | filter_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5641 | } |
| 5642 | |
| 5643 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5644 | HeapObject* HeapIterator::next() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5645 | if (filter_ == NULL) return NextObject(); |
| 5646 | |
| 5647 | HeapObject* obj = NextObject(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5648 | while (obj != NULL && filter_->SkipObject(obj)) obj = NextObject(); |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5649 | return obj; |
| 5650 | } |
| 5651 | |
| 5652 | |
| 5653 | HeapObject* HeapIterator::NextObject() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5654 | // No iterator means we are done. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5655 | if (object_iterator_ == NULL) return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5656 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5657 | if (HeapObject* obj = object_iterator_->next_object()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5658 | // If the current iterator has more objects we are fine. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5659 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5660 | } else { |
| 5661 | // Go though the spaces looking for one that has objects. |
| 5662 | while (space_iterator_->has_next()) { |
| 5663 | object_iterator_ = space_iterator_->next(); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5664 | if (HeapObject* obj = object_iterator_->next_object()) { |
| 5665 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5666 | } |
| 5667 | } |
| 5668 | } |
| 5669 | // Done with the last space. |
| 5670 | object_iterator_ = NULL; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5671 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5672 | } |
| 5673 | |
| 5674 | |
| 5675 | void HeapIterator::reset() { |
| 5676 | // Restart the iterator. |
| 5677 | Shutdown(); |
| 5678 | Init(); |
| 5679 | } |
| 5680 | |
| 5681 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5682 | #if defined(DEBUG) || defined(LIVE_OBJECT_LIST) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5683 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5684 | Object* const PathTracer::kAnyGlobalObject = reinterpret_cast<Object*>(NULL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5685 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5686 | class PathTracer::MarkVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5687 | public: |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5688 | explicit MarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5689 | void VisitPointers(Object** start, Object** end) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5690 | // Scan all HeapObject pointers in [start, end) |
| 5691 | for (Object** p = start; !tracer_->found() && (p < end); p++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5692 | if ((*p)->IsHeapObject()) |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5693 | tracer_->MarkRecursively(p, this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5694 | } |
| 5695 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5696 | |
| 5697 | private: |
| 5698 | PathTracer* tracer_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5699 | }; |
| 5700 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5701 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5702 | class PathTracer::UnmarkVisitor: public ObjectVisitor { |
| 5703 | public: |
| 5704 | explicit UnmarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
| 5705 | void VisitPointers(Object** start, Object** end) { |
| 5706 | // Scan all HeapObject pointers in [start, end) |
| 5707 | for (Object** p = start; p < end; p++) { |
| 5708 | if ((*p)->IsHeapObject()) |
| 5709 | tracer_->UnmarkRecursively(p, this); |
| 5710 | } |
| 5711 | } |
| 5712 | |
| 5713 | private: |
| 5714 | PathTracer* tracer_; |
| 5715 | }; |
| 5716 | |
| 5717 | |
| 5718 | void PathTracer::VisitPointers(Object** start, Object** end) { |
| 5719 | bool done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 5720 | // Visit all HeapObject pointers in [start, end) |
| 5721 | for (Object** p = start; !done && (p < end); p++) { |
| 5722 | if ((*p)->IsHeapObject()) { |
| 5723 | TracePathFrom(p); |
| 5724 | done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 5725 | } |
| 5726 | } |
| 5727 | } |
| 5728 | |
| 5729 | |
| 5730 | void PathTracer::Reset() { |
| 5731 | found_target_ = false; |
| 5732 | object_stack_.Clear(); |
| 5733 | } |
| 5734 | |
| 5735 | |
| 5736 | void PathTracer::TracePathFrom(Object** root) { |
| 5737 | ASSERT((search_target_ == kAnyGlobalObject) || |
| 5738 | search_target_->IsHeapObject()); |
| 5739 | found_target_in_trace_ = false; |
| 5740 | object_stack_.Clear(); |
| 5741 | |
| 5742 | MarkVisitor mark_visitor(this); |
| 5743 | MarkRecursively(root, &mark_visitor); |
| 5744 | |
| 5745 | UnmarkVisitor unmark_visitor(this); |
| 5746 | UnmarkRecursively(root, &unmark_visitor); |
| 5747 | |
| 5748 | ProcessResults(); |
| 5749 | } |
| 5750 | |
| 5751 | |
| 5752 | void PathTracer::MarkRecursively(Object** p, MarkVisitor* mark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5753 | if (!(*p)->IsHeapObject()) return; |
| 5754 | |
| 5755 | HeapObject* obj = HeapObject::cast(*p); |
| 5756 | |
| 5757 | Object* map = obj->map(); |
| 5758 | |
| 5759 | if (!map->IsHeapObject()) return; // visited before |
| 5760 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5761 | if (found_target_in_trace_) return; // stop if target found |
| 5762 | object_stack_.Add(obj); |
| 5763 | if (((search_target_ == kAnyGlobalObject) && obj->IsJSGlobalObject()) || |
| 5764 | (obj == search_target_)) { |
| 5765 | found_target_in_trace_ = true; |
| 5766 | found_target_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5767 | return; |
| 5768 | } |
| 5769 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5770 | bool is_global_context = obj->IsGlobalContext(); |
| 5771 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5772 | // not visited yet |
| 5773 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 5774 | |
| 5775 | Address map_addr = map_p->address(); |
| 5776 | |
| 5777 | obj->set_map(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
| 5778 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5779 | // Scan the object body. |
| 5780 | if (is_global_context && (visit_mode_ == VISIT_ONLY_STRONG)) { |
| 5781 | // This is specialized to scan Context's properly. |
| 5782 | Object** start = reinterpret_cast<Object**>(obj->address() + |
| 5783 | Context::kHeaderSize); |
| 5784 | Object** end = reinterpret_cast<Object**>(obj->address() + |
| 5785 | Context::kHeaderSize + Context::FIRST_WEAK_SLOT * kPointerSize); |
| 5786 | mark_visitor->VisitPointers(start, end); |
| 5787 | } else { |
| 5788 | obj->IterateBody(map_p->instance_type(), |
| 5789 | obj->SizeFromMap(map_p), |
| 5790 | mark_visitor); |
| 5791 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5792 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5793 | // Scan the map after the body because the body is a lot more interesting |
| 5794 | // when doing leak detection. |
| 5795 | MarkRecursively(&map, mark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5796 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5797 | if (!found_target_in_trace_) // don't pop if found the target |
| 5798 | object_stack_.RemoveLast(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5799 | } |
| 5800 | |
| 5801 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5802 | void PathTracer::UnmarkRecursively(Object** p, UnmarkVisitor* unmark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5803 | if (!(*p)->IsHeapObject()) return; |
| 5804 | |
| 5805 | HeapObject* obj = HeapObject::cast(*p); |
| 5806 | |
| 5807 | Object* map = obj->map(); |
| 5808 | |
| 5809 | if (map->IsHeapObject()) return; // unmarked already |
| 5810 | |
| 5811 | Address map_addr = reinterpret_cast<Address>(map); |
| 5812 | |
| 5813 | map_addr -= kMarkTag; |
| 5814 | |
| 5815 | ASSERT_TAG_ALIGNED(map_addr); |
| 5816 | |
| 5817 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 5818 | |
| 5819 | obj->set_map(reinterpret_cast<Map*>(map_p)); |
| 5820 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5821 | UnmarkRecursively(reinterpret_cast<Object**>(&map_p), unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5822 | |
| 5823 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 5824 | obj->SizeFromMap(Map::cast(map_p)), |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5825 | unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5826 | } |
| 5827 | |
| 5828 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5829 | void PathTracer::ProcessResults() { |
| 5830 | if (found_target_) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5831 | PrintF("=====================================\n"); |
| 5832 | PrintF("==== Path to object ====\n"); |
| 5833 | PrintF("=====================================\n\n"); |
| 5834 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5835 | ASSERT(!object_stack_.is_empty()); |
| 5836 | for (int i = 0; i < object_stack_.length(); i++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5837 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5838 | Object* obj = object_stack_[i]; |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 5839 | #ifdef OBJECT_PRINT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5840 | obj->Print(); |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 5841 | #else |
| 5842 | obj->ShortPrint(); |
| 5843 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5844 | } |
| 5845 | PrintF("=====================================\n"); |
| 5846 | } |
| 5847 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5848 | #endif // DEBUG || LIVE_OBJECT_LIST |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5849 | |
| 5850 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5851 | #ifdef DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5852 | // Triggers a depth-first traversal of reachable objects from roots |
| 5853 | // 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] | 5854 | void Heap::TracePathToObject(Object* target) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5855 | PathTracer tracer(target, PathTracer::FIND_ALL, VISIT_ALL); |
| 5856 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5857 | } |
| 5858 | |
| 5859 | |
| 5860 | // Triggers a depth-first traversal of reachable objects from roots |
| 5861 | // and finds a path to any global object and prints it. Useful for |
| 5862 | // determining the source for leaks of global objects. |
| 5863 | void Heap::TracePathToGlobal() { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 5864 | PathTracer tracer(PathTracer::kAnyGlobalObject, |
| 5865 | PathTracer::FIND_ALL, |
| 5866 | VISIT_ALL); |
| 5867 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5868 | } |
| 5869 | #endif |
| 5870 | |
| 5871 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5872 | static intptr_t CountTotalHolesSize() { |
| 5873 | intptr_t holes_size = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5874 | OldSpaces spaces; |
| 5875 | for (OldSpace* space = spaces.next(); |
| 5876 | space != NULL; |
| 5877 | space = spaces.next()) { |
| 5878 | holes_size += space->Waste() + space->AvailableFree(); |
| 5879 | } |
| 5880 | return holes_size; |
| 5881 | } |
| 5882 | |
| 5883 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5884 | GCTracer::GCTracer(Heap* heap) |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5885 | : start_time_(0.0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5886 | start_size_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5887 | gc_count_(0), |
| 5888 | full_gc_count_(0), |
| 5889 | is_compacting_(false), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5890 | marked_count_(0), |
| 5891 | allocated_since_last_gc_(0), |
| 5892 | spent_in_mutator_(0), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5893 | promoted_objects_size_(0), |
| 5894 | heap_(heap) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5895 | // These two fields reflect the state of the previous full collection. |
| 5896 | // Set them before they are changed by the collector. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5897 | previous_has_compacted_ = heap_->mark_compact_collector_.HasCompacted(); |
| 5898 | previous_marked_count_ = |
| 5899 | heap_->mark_compact_collector_.previous_marked_count(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5900 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5901 | start_time_ = OS::TimeCurrentMillis(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5902 | start_size_ = heap_->SizeOfObjects(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5903 | |
| 5904 | for (int i = 0; i < Scope::kNumberOfScopes; i++) { |
| 5905 | scopes_[i] = 0; |
| 5906 | } |
| 5907 | |
| 5908 | in_free_list_or_wasted_before_gc_ = CountTotalHolesSize(); |
| 5909 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5910 | allocated_since_last_gc_ = |
| 5911 | heap_->SizeOfObjects() - heap_->alive_after_last_gc_; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5912 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5913 | if (heap_->last_gc_end_timestamp_ > 0) { |
| 5914 | 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] | 5915 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5916 | } |
| 5917 | |
| 5918 | |
| 5919 | GCTracer::~GCTracer() { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5920 | // Printf ONE line iff flag is set. |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5921 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
| 5922 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5923 | bool first_gc = (heap_->last_gc_end_timestamp_ == 0); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5924 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5925 | heap_->alive_after_last_gc_ = heap_->SizeOfObjects(); |
| 5926 | heap_->last_gc_end_timestamp_ = OS::TimeCurrentMillis(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5927 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5928 | 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] | 5929 | |
| 5930 | // Update cumulative GC statistics if required. |
| 5931 | if (FLAG_print_cumulative_gc_stat) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5932 | heap_->max_gc_pause_ = Max(heap_->max_gc_pause_, time); |
| 5933 | heap_->max_alive_after_gc_ = Max(heap_->max_alive_after_gc_, |
| 5934 | heap_->alive_after_last_gc_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5935 | if (!first_gc) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5936 | heap_->min_in_mutator_ = Min(heap_->min_in_mutator_, |
| 5937 | static_cast<int>(spent_in_mutator_)); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5938 | } |
| 5939 | } |
| 5940 | |
| 5941 | if (!FLAG_trace_gc_nvp) { |
| 5942 | int external_time = static_cast<int>(scopes_[Scope::EXTERNAL]); |
| 5943 | |
| 5944 | PrintF("%s %.1f -> %.1f MB, ", |
| 5945 | CollectorString(), |
| 5946 | static_cast<double>(start_size_) / MB, |
| 5947 | SizeOfHeapObjects()); |
| 5948 | |
| 5949 | if (external_time > 0) PrintF("%d / ", external_time); |
| 5950 | PrintF("%d ms.\n", time); |
| 5951 | } else { |
| 5952 | PrintF("pause=%d ", time); |
| 5953 | PrintF("mutator=%d ", |
| 5954 | static_cast<int>(spent_in_mutator_)); |
| 5955 | |
| 5956 | PrintF("gc="); |
| 5957 | switch (collector_) { |
| 5958 | case SCAVENGER: |
| 5959 | PrintF("s"); |
| 5960 | break; |
| 5961 | case MARK_COMPACTOR: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5962 | PrintF("%s", |
| 5963 | heap_->mark_compact_collector_.HasCompacted() ? "mc" : "ms"); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5964 | break; |
| 5965 | default: |
| 5966 | UNREACHABLE(); |
| 5967 | } |
| 5968 | PrintF(" "); |
| 5969 | |
| 5970 | PrintF("external=%d ", static_cast<int>(scopes_[Scope::EXTERNAL])); |
| 5971 | PrintF("mark=%d ", static_cast<int>(scopes_[Scope::MC_MARK])); |
| 5972 | PrintF("sweep=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP])); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5973 | 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] | 5974 | PrintF("compact=%d ", static_cast<int>(scopes_[Scope::MC_COMPACT])); |
| 5975 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5976 | PrintF("total_size_before=%" V8_PTR_PREFIX "d ", start_size_); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5977 | PrintF("total_size_after=%" V8_PTR_PREFIX "d ", heap_->SizeOfObjects()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5978 | PrintF("holes_size_before=%" V8_PTR_PREFIX "d ", |
| 5979 | in_free_list_or_wasted_before_gc_); |
| 5980 | PrintF("holes_size_after=%" V8_PTR_PREFIX "d ", CountTotalHolesSize()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5981 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5982 | PrintF("allocated=%" V8_PTR_PREFIX "d ", allocated_since_last_gc_); |
| 5983 | PrintF("promoted=%" V8_PTR_PREFIX "d ", promoted_objects_size_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5984 | |
| 5985 | PrintF("\n"); |
| 5986 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 5987 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5988 | heap_->PrintShortHeapStatistics(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5989 | } |
| 5990 | |
| 5991 | |
| 5992 | const char* GCTracer::CollectorString() { |
| 5993 | switch (collector_) { |
| 5994 | case SCAVENGER: |
| 5995 | return "Scavenge"; |
| 5996 | case MARK_COMPACTOR: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 5997 | return heap_->mark_compact_collector_.HasCompacted() ? "Mark-compact" |
| 5998 | : "Mark-sweep"; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5999 | } |
| 6000 | return "Unknown GC"; |
| 6001 | } |
| 6002 | |
| 6003 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6004 | int KeyedLookupCache::Hash(Map* map, String* name) { |
| 6005 | // Uses only lower 32 bits if pointers are larger. |
| 6006 | uintptr_t addr_hash = |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6007 | static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> kMapHashShift; |
fschneider@chromium.org | b95b98b | 2010-02-23 10:34:29 +0000 | [diff] [blame] | 6008 | return static_cast<uint32_t>((addr_hash ^ name->Hash()) & kCapacityMask); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6009 | } |
| 6010 | |
| 6011 | |
| 6012 | int KeyedLookupCache::Lookup(Map* map, String* name) { |
| 6013 | int index = Hash(map, name); |
| 6014 | Key& key = keys_[index]; |
| 6015 | if ((key.map == map) && key.name->Equals(name)) { |
| 6016 | return field_offsets_[index]; |
| 6017 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6018 | return kNotFound; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6019 | } |
| 6020 | |
| 6021 | |
| 6022 | void KeyedLookupCache::Update(Map* map, String* name, int field_offset) { |
| 6023 | String* symbol; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6024 | if (HEAP->LookupSymbolIfExists(name, &symbol)) { |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6025 | int index = Hash(map, symbol); |
| 6026 | Key& key = keys_[index]; |
| 6027 | key.map = map; |
| 6028 | key.name = symbol; |
| 6029 | field_offsets_[index] = field_offset; |
| 6030 | } |
| 6031 | } |
| 6032 | |
| 6033 | |
| 6034 | void KeyedLookupCache::Clear() { |
| 6035 | for (int index = 0; index < kLength; index++) keys_[index].map = NULL; |
| 6036 | } |
| 6037 | |
| 6038 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 6039 | void DescriptorLookupCache::Clear() { |
| 6040 | for (int index = 0; index < kLength; index++) keys_[index].array = NULL; |
| 6041 | } |
| 6042 | |
| 6043 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6044 | #ifdef DEBUG |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 6045 | void Heap::GarbageCollectionGreedyCheck() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6046 | ASSERT(FLAG_gc_greedy); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6047 | if (isolate_->bootstrapper()->IsActive()) return; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 6048 | if (disallow_allocation_failure()) return; |
| 6049 | CollectGarbage(NEW_SPACE); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 6050 | } |
| 6051 | #endif |
| 6052 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6053 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6054 | TranscendentalCache::SubCache::SubCache(Type t) |
| 6055 | : type_(t), |
| 6056 | isolate_(Isolate::Current()) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6057 | uint32_t in0 = 0xffffffffu; // Bit-pattern for a NaN that isn't |
| 6058 | uint32_t in1 = 0xffffffffu; // generated by the FPU. |
| 6059 | for (int i = 0; i < kCacheSize; i++) { |
| 6060 | elements_[i].in[0] = in0; |
| 6061 | elements_[i].in[1] = in1; |
| 6062 | elements_[i].output = NULL; |
| 6063 | } |
| 6064 | } |
| 6065 | |
| 6066 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 6067 | void TranscendentalCache::Clear() { |
| 6068 | for (int i = 0; i < kNumberOfCaches; i++) { |
| 6069 | if (caches_[i] != NULL) { |
| 6070 | delete caches_[i]; |
| 6071 | caches_[i] = NULL; |
| 6072 | } |
| 6073 | } |
| 6074 | } |
| 6075 | |
| 6076 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6077 | void ExternalStringTable::CleanUp() { |
| 6078 | int last = 0; |
| 6079 | for (int i = 0; i < new_space_strings_.length(); ++i) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6080 | if (new_space_strings_[i] == heap_->raw_unchecked_null_value()) continue; |
| 6081 | if (heap_->InNewSpace(new_space_strings_[i])) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6082 | new_space_strings_[last++] = new_space_strings_[i]; |
| 6083 | } else { |
| 6084 | old_space_strings_.Add(new_space_strings_[i]); |
| 6085 | } |
| 6086 | } |
| 6087 | new_space_strings_.Rewind(last); |
| 6088 | last = 0; |
| 6089 | for (int i = 0; i < old_space_strings_.length(); ++i) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 6090 | if (old_space_strings_[i] == heap_->raw_unchecked_null_value()) continue; |
| 6091 | ASSERT(!heap_->InNewSpace(old_space_strings_[i])); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 6092 | old_space_strings_[last++] = old_space_strings_[i]; |
| 6093 | } |
| 6094 | old_space_strings_.Rewind(last); |
| 6095 | Verify(); |
| 6096 | } |
| 6097 | |
| 6098 | |
| 6099 | void ExternalStringTable::TearDown() { |
| 6100 | new_space_strings_.Free(); |
| 6101 | old_space_strings_.Free(); |
| 6102 | } |
| 6103 | |
| 6104 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 6105 | } } // namespace v8::internal |