ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 1 | // Copyright 2009 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" |
| 33 | #include "codegen-inl.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" |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 36 | #include "heap-profiler.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 37 | #include "global-handles.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 38 | #include "mark-compact.h" |
| 39 | #include "natives.h" |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 40 | #include "objects-visiting.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 41 | #include "scanner.h" |
| 42 | #include "scopeinfo.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 43 | #include "snapshot.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 44 | #include "v8threads.h" |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 45 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 46 | #include "regexp-macro-assembler.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 47 | #include "arm/regexp-macro-assembler-arm.h" |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 48 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 49 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 50 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 51 | namespace v8 { |
| 52 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 53 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 54 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 55 | String* Heap::hidden_symbol_; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 56 | Object* Heap::roots_[Heap::kRootListLength]; |
| 57 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 58 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 59 | NewSpace Heap::new_space_; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 60 | OldSpace* Heap::old_pointer_space_ = NULL; |
| 61 | OldSpace* Heap::old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 62 | OldSpace* Heap::code_space_ = NULL; |
| 63 | MapSpace* Heap::map_space_ = NULL; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 64 | CellSpace* Heap::cell_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 65 | LargeObjectSpace* Heap::lo_space_ = NULL; |
| 66 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 67 | static const int kMinimumPromotionLimit = 2*MB; |
| 68 | static const int kMinimumAllocationLimit = 8*MB; |
| 69 | |
| 70 | int Heap::old_gen_promotion_limit_ = kMinimumPromotionLimit; |
| 71 | int Heap::old_gen_allocation_limit_ = kMinimumAllocationLimit; |
| 72 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 73 | int Heap::old_gen_exhausted_ = false; |
| 74 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 75 | int Heap::amount_of_external_allocated_memory_ = 0; |
| 76 | int Heap::amount_of_external_allocated_memory_at_last_global_gc_ = 0; |
| 77 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 78 | // semispace_size_ should be a power of 2 and old_generation_size_ should be |
| 79 | // a multiple of Page::kPageSize. |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 80 | #if defined(ANDROID) |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 81 | int Heap::max_semispace_size_ = 2*MB; |
| 82 | int Heap::max_old_generation_size_ = 192*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 83 | int Heap::initial_semispace_size_ = 128*KB; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 84 | size_t Heap::code_range_size_ = 0; |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 85 | #elif defined(V8_TARGET_ARCH_X64) |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 86 | int Heap::max_semispace_size_ = 16*MB; |
| 87 | int Heap::max_old_generation_size_ = 1*GB; |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 88 | int Heap::initial_semispace_size_ = 1*MB; |
sgjesse@chromium.org | 152a0b0 | 2009-10-07 13:50:16 +0000 | [diff] [blame] | 89 | size_t Heap::code_range_size_ = 512*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 90 | #else |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 91 | int Heap::max_semispace_size_ = 8*MB; |
| 92 | int Heap::max_old_generation_size_ = 512*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 93 | int Heap::initial_semispace_size_ = 512*KB; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 94 | size_t Heap::code_range_size_ = 0; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 95 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 96 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 97 | // The snapshot semispace size will be the default semispace size if |
| 98 | // snapshotting is used and will be the requested semispace size as |
| 99 | // set up by ConfigureHeap otherwise. |
| 100 | int Heap::reserved_semispace_size_ = Heap::max_semispace_size_; |
| 101 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 102 | List<Heap::GCPrologueCallbackPair> Heap::gc_prologue_callbacks_; |
| 103 | List<Heap::GCEpilogueCallbackPair> Heap::gc_epilogue_callbacks_; |
| 104 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 105 | GCCallback Heap::global_gc_prologue_callback_ = NULL; |
| 106 | GCCallback Heap::global_gc_epilogue_callback_ = NULL; |
| 107 | |
| 108 | // Variables set based on semispace_size_ and old_generation_size_ in |
| 109 | // ConfigureHeap. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 110 | |
| 111 | // Will be 4 * reserved_semispace_size_ to ensure that young |
| 112 | // generation can be aligned to its size. |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 113 | int Heap::survived_since_last_expansion_ = 0; |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 114 | int Heap::external_allocation_limit_ = 0; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 115 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 116 | Heap::HeapState Heap::gc_state_ = NOT_IN_GC; |
| 117 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 118 | int Heap::mc_count_ = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 119 | int Heap::ms_count_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 120 | int Heap::gc_count_ = 0; |
| 121 | |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 122 | GCTracer* Heap::tracer_ = NULL; |
| 123 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 124 | int Heap::unflattened_strings_length_ = 0; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 125 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 126 | int Heap::always_allocate_scope_depth_ = 0; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 127 | int Heap::linear_allocation_scope_depth_ = 0; |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 128 | int Heap::contexts_disposed_ = 0; |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 129 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 130 | int Heap::young_survivors_after_last_gc_ = 0; |
| 131 | int Heap::high_survival_rate_period_length_ = 0; |
| 132 | double Heap::survival_rate_ = 0; |
| 133 | Heap::SurvivalRateTrend Heap::previous_survival_rate_trend_ = Heap::STABLE; |
| 134 | Heap::SurvivalRateTrend Heap::survival_rate_trend_ = Heap::STABLE; |
| 135 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 136 | #ifdef DEBUG |
| 137 | bool Heap::allocation_allowed_ = true; |
| 138 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 139 | int Heap::allocation_timeout_ = 0; |
| 140 | bool Heap::disallow_allocation_failure_ = false; |
| 141 | #endif // DEBUG |
| 142 | |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 143 | int GCTracer::alive_after_last_gc_ = 0; |
| 144 | double GCTracer::last_gc_end_timestamp_ = 0.0; |
| 145 | int GCTracer::max_gc_pause_ = 0; |
| 146 | int GCTracer::max_alive_after_gc_ = 0; |
| 147 | int GCTracer::min_in_mutator_ = kMaxInt; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 148 | |
| 149 | int Heap::Capacity() { |
| 150 | if (!HasBeenSetup()) return 0; |
| 151 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 152 | return new_space_.Capacity() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 153 | old_pointer_space_->Capacity() + |
| 154 | old_data_space_->Capacity() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 155 | code_space_->Capacity() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 156 | map_space_->Capacity() + |
| 157 | cell_space_->Capacity(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 161 | int Heap::CommittedMemory() { |
| 162 | if (!HasBeenSetup()) return 0; |
| 163 | |
| 164 | return new_space_.CommittedMemory() + |
| 165 | old_pointer_space_->CommittedMemory() + |
| 166 | old_data_space_->CommittedMemory() + |
| 167 | code_space_->CommittedMemory() + |
| 168 | map_space_->CommittedMemory() + |
| 169 | cell_space_->CommittedMemory() + |
| 170 | lo_space_->Size(); |
| 171 | } |
| 172 | |
| 173 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 174 | int Heap::Available() { |
| 175 | if (!HasBeenSetup()) return 0; |
| 176 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 177 | return new_space_.Available() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 178 | old_pointer_space_->Available() + |
| 179 | old_data_space_->Available() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 180 | code_space_->Available() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 181 | map_space_->Available() + |
| 182 | cell_space_->Available(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | |
| 186 | bool Heap::HasBeenSetup() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 187 | return old_pointer_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 188 | old_data_space_ != NULL && |
| 189 | code_space_ != NULL && |
| 190 | map_space_ != NULL && |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 191 | cell_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 192 | lo_space_ != NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | |
| 196 | GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space) { |
| 197 | // Is global GC requested? |
| 198 | if (space != NEW_SPACE || FLAG_gc_global) { |
| 199 | Counters::gc_compactor_caused_by_request.Increment(); |
| 200 | return MARK_COMPACTOR; |
| 201 | } |
| 202 | |
| 203 | // Is enough data promoted to justify a global GC? |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 204 | if (OldGenerationPromotionLimitReached()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 205 | Counters::gc_compactor_caused_by_promoted_data.Increment(); |
| 206 | return MARK_COMPACTOR; |
| 207 | } |
| 208 | |
| 209 | // Have allocation in OLD and LO failed? |
| 210 | if (old_gen_exhausted_) { |
| 211 | Counters::gc_compactor_caused_by_oldspace_exhaustion.Increment(); |
| 212 | return MARK_COMPACTOR; |
| 213 | } |
| 214 | |
| 215 | // Is there enough space left in OLD to guarantee that a scavenge can |
| 216 | // succeed? |
| 217 | // |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 218 | // Note that MemoryAllocator->MaxAvailable() undercounts the memory available |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 219 | // for object promotion. It counts only the bytes that the memory |
| 220 | // allocator has not yet allocated from the OS and assigned to any space, |
| 221 | // and does not count available bytes already in the old space or code |
| 222 | // space. Undercounting is safe---we may get an unrequested full GC when |
| 223 | // a scavenge would have succeeded. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 224 | if (MemoryAllocator::MaxAvailable() <= new_space_.Size()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 225 | Counters::gc_compactor_caused_by_oldspace_exhaustion.Increment(); |
| 226 | return MARK_COMPACTOR; |
| 227 | } |
| 228 | |
| 229 | // Default |
| 230 | return SCAVENGER; |
| 231 | } |
| 232 | |
| 233 | |
| 234 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 235 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 236 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 237 | void Heap::ReportStatisticsBeforeGC() { |
| 238 | // Heap::ReportHeapStatistics will also log NewSpace statistics when |
| 239 | // compiled with ENABLE_LOGGING_AND_PROFILING and --log-gc is set. The |
| 240 | // following logic is used to avoid double logging. |
| 241 | #if defined(DEBUG) && defined(ENABLE_LOGGING_AND_PROFILING) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 242 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 243 | if (FLAG_heap_stats) { |
| 244 | ReportHeapStatistics("Before GC"); |
| 245 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 246 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 247 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 248 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 249 | #elif defined(DEBUG) |
| 250 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 251 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 252 | ReportHeapStatistics("Before GC"); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 253 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 254 | } |
| 255 | #elif defined(ENABLE_LOGGING_AND_PROFILING) |
| 256 | if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 257 | new_space_.CollectStatistics(); |
| 258 | new_space_.ReportStatistics(); |
| 259 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 260 | } |
| 261 | #endif |
| 262 | } |
| 263 | |
| 264 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 265 | #if defined(ENABLE_LOGGING_AND_PROFILING) |
| 266 | void Heap::PrintShortHeapStatistics() { |
| 267 | if (!FLAG_trace_gc_verbose) return; |
| 268 | PrintF("Memory allocator, used: %8d, available: %8d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 269 | MemoryAllocator::Size(), |
| 270 | MemoryAllocator::Available()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 271 | PrintF("New space, used: %8d, available: %8d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 272 | Heap::new_space_.Size(), |
| 273 | new_space_.Available()); |
| 274 | PrintF("Old pointers, used: %8d, available: %8d, waste: %8d\n", |
| 275 | old_pointer_space_->Size(), |
| 276 | old_pointer_space_->Available(), |
| 277 | old_pointer_space_->Waste()); |
| 278 | PrintF("Old data space, used: %8d, available: %8d, waste: %8d\n", |
| 279 | old_data_space_->Size(), |
| 280 | old_data_space_->Available(), |
| 281 | old_data_space_->Waste()); |
| 282 | PrintF("Code space, used: %8d, available: %8d, waste: %8d\n", |
| 283 | code_space_->Size(), |
| 284 | code_space_->Available(), |
| 285 | code_space_->Waste()); |
| 286 | PrintF("Map space, used: %8d, available: %8d, waste: %8d\n", |
| 287 | map_space_->Size(), |
| 288 | map_space_->Available(), |
| 289 | map_space_->Waste()); |
| 290 | PrintF("Cell space, used: %8d, available: %8d, waste: %8d\n", |
| 291 | cell_space_->Size(), |
| 292 | cell_space_->Available(), |
| 293 | cell_space_->Waste()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 294 | PrintF("Large object space, used: %8d, avaialble: %8d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 295 | lo_space_->Size(), |
| 296 | lo_space_->Available()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 297 | } |
| 298 | #endif |
| 299 | |
| 300 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 301 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 302 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 303 | void Heap::ReportStatisticsAfterGC() { |
| 304 | // Similar to the before GC, we use some complicated logic to ensure that |
| 305 | // NewSpace statistics are logged exactly once when --log-gc is turned on. |
| 306 | #if defined(DEBUG) && defined(ENABLE_LOGGING_AND_PROFILING) |
| 307 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 308 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 309 | ReportHeapStatistics("After GC"); |
| 310 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 311 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 312 | } |
| 313 | #elif defined(DEBUG) |
| 314 | if (FLAG_heap_stats) ReportHeapStatistics("After GC"); |
| 315 | #elif defined(ENABLE_LOGGING_AND_PROFILING) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 316 | if (FLAG_log_gc) new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 317 | #endif |
| 318 | } |
| 319 | #endif // defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 320 | |
| 321 | |
| 322 | void Heap::GarbageCollectionPrologue() { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 323 | TranscendentalCache::Clear(); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 324 | ClearJSFunctionResultCaches(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 325 | gc_count_++; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 326 | unflattened_strings_length_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 327 | #ifdef DEBUG |
| 328 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 329 | allow_allocation(false); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 330 | |
| 331 | if (FLAG_verify_heap) { |
| 332 | Verify(); |
| 333 | } |
| 334 | |
| 335 | if (FLAG_gc_verbose) Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 336 | #endif |
| 337 | |
| 338 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 339 | ReportStatisticsBeforeGC(); |
| 340 | #endif |
| 341 | } |
| 342 | |
| 343 | int Heap::SizeOfObjects() { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 344 | int total = 0; |
| 345 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 346 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 347 | total += space->Size(); |
| 348 | } |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 349 | return total; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | void Heap::GarbageCollectionEpilogue() { |
| 353 | #ifdef DEBUG |
| 354 | allow_allocation(true); |
| 355 | ZapFromSpace(); |
| 356 | |
| 357 | if (FLAG_verify_heap) { |
| 358 | Verify(); |
| 359 | } |
| 360 | |
| 361 | if (FLAG_print_global_handles) GlobalHandles::Print(); |
| 362 | if (FLAG_print_handles) PrintHandles(); |
| 363 | if (FLAG_gc_verbose) Print(); |
| 364 | if (FLAG_code_stats) ReportCodeStatistics("After GC"); |
| 365 | #endif |
| 366 | |
| 367 | Counters::alive_after_last_gc.Set(SizeOfObjects()); |
| 368 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 369 | Counters::symbol_table_capacity.Set(symbol_table()->Capacity()); |
| 370 | Counters::number_of_symbols.Set(symbol_table()->NumberOfElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 371 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 372 | ReportStatisticsAfterGC(); |
| 373 | #endif |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 374 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 375 | Debug::AfterGarbageCollection(); |
| 376 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 380 | void Heap::CollectAllGarbage(bool force_compaction) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 381 | // Since we are ignoring the return value, the exact choice of space does |
| 382 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 383 | // cause a full GC. |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 384 | MarkCompactCollector::SetForceCompaction(force_compaction); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 385 | CollectGarbage(0, OLD_POINTER_SPACE); |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 386 | MarkCompactCollector::SetForceCompaction(false); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 390 | bool Heap::CollectGarbage(int requested_size, AllocationSpace space) { |
| 391 | // The VM is in the GC state until exiting this function. |
| 392 | VMState state(GC); |
| 393 | |
| 394 | #ifdef DEBUG |
| 395 | // Reset the allocation timeout to the GC interval, but make sure to |
| 396 | // allow at least a few allocations after a collection. The reason |
| 397 | // for this is that we have a lot of allocation sequences and we |
| 398 | // assume that a garbage collection will allow the subsequent |
| 399 | // allocation attempts to go through. |
| 400 | allocation_timeout_ = Max(6, FLAG_gc_interval); |
| 401 | #endif |
| 402 | |
| 403 | { GCTracer tracer; |
| 404 | GarbageCollectionPrologue(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 405 | // The GC count was incremented in the prologue. Tell the tracer about |
| 406 | // it. |
| 407 | tracer.set_gc_count(gc_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 408 | |
| 409 | GarbageCollector collector = SelectGarbageCollector(space); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 410 | // Tell the tracer which collector we've selected. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 411 | tracer.set_collector(collector); |
| 412 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 413 | HistogramTimer* rate = (collector == SCAVENGER) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 414 | ? &Counters::gc_scavenger |
| 415 | : &Counters::gc_compactor; |
| 416 | rate->Start(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 417 | PerformGarbageCollection(space, collector, &tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 418 | rate->Stop(); |
| 419 | |
| 420 | GarbageCollectionEpilogue(); |
| 421 | } |
| 422 | |
| 423 | |
| 424 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 425 | if (FLAG_log_gc) HeapProfiler::WriteSample(); |
| 426 | #endif |
| 427 | |
| 428 | switch (space) { |
| 429 | case NEW_SPACE: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 430 | return new_space_.Available() >= requested_size; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 431 | case OLD_POINTER_SPACE: |
| 432 | return old_pointer_space_->Available() >= requested_size; |
| 433 | case OLD_DATA_SPACE: |
| 434 | return old_data_space_->Available() >= requested_size; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 435 | case CODE_SPACE: |
| 436 | return code_space_->Available() >= requested_size; |
| 437 | case MAP_SPACE: |
| 438 | return map_space_->Available() >= requested_size; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 439 | case CELL_SPACE: |
| 440 | return cell_space_->Available() >= requested_size; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 441 | case LO_SPACE: |
| 442 | return lo_space_->Available() >= requested_size; |
| 443 | } |
| 444 | return false; |
| 445 | } |
| 446 | |
| 447 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 448 | void Heap::PerformScavenge() { |
| 449 | GCTracer tracer; |
| 450 | PerformGarbageCollection(NEW_SPACE, SCAVENGER, &tracer); |
| 451 | } |
| 452 | |
| 453 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 454 | #ifdef DEBUG |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 455 | // Helper class for verifying the symbol table. |
| 456 | class SymbolTableVerifier : public ObjectVisitor { |
| 457 | public: |
| 458 | SymbolTableVerifier() { } |
| 459 | void VisitPointers(Object** start, Object** end) { |
| 460 | // Visit all HeapObject pointers in [start, end). |
| 461 | for (Object** p = start; p < end; p++) { |
| 462 | if ((*p)->IsHeapObject()) { |
| 463 | // Check that the symbol is actually a symbol. |
| 464 | ASSERT((*p)->IsNull() || (*p)->IsUndefined() || (*p)->IsSymbol()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 465 | } |
| 466 | } |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 467 | } |
| 468 | }; |
| 469 | #endif // DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 470 | |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 471 | |
| 472 | static void VerifySymbolTable() { |
| 473 | #ifdef DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 474 | SymbolTableVerifier verifier; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 475 | Heap::symbol_table()->IterateElements(&verifier); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 476 | #endif // DEBUG |
| 477 | } |
| 478 | |
| 479 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 480 | void Heap::ReserveSpace( |
| 481 | int new_space_size, |
| 482 | int pointer_space_size, |
| 483 | int data_space_size, |
| 484 | int code_space_size, |
| 485 | int map_space_size, |
| 486 | int cell_space_size, |
| 487 | int large_object_size) { |
| 488 | NewSpace* new_space = Heap::new_space(); |
| 489 | PagedSpace* old_pointer_space = Heap::old_pointer_space(); |
| 490 | PagedSpace* old_data_space = Heap::old_data_space(); |
| 491 | PagedSpace* code_space = Heap::code_space(); |
| 492 | PagedSpace* map_space = Heap::map_space(); |
| 493 | PagedSpace* cell_space = Heap::cell_space(); |
| 494 | LargeObjectSpace* lo_space = Heap::lo_space(); |
| 495 | bool gc_performed = true; |
| 496 | while (gc_performed) { |
| 497 | gc_performed = false; |
| 498 | if (!new_space->ReserveSpace(new_space_size)) { |
| 499 | Heap::CollectGarbage(new_space_size, NEW_SPACE); |
| 500 | gc_performed = true; |
| 501 | } |
| 502 | if (!old_pointer_space->ReserveSpace(pointer_space_size)) { |
| 503 | Heap::CollectGarbage(pointer_space_size, OLD_POINTER_SPACE); |
| 504 | gc_performed = true; |
| 505 | } |
| 506 | if (!(old_data_space->ReserveSpace(data_space_size))) { |
| 507 | Heap::CollectGarbage(data_space_size, OLD_DATA_SPACE); |
| 508 | gc_performed = true; |
| 509 | } |
| 510 | if (!(code_space->ReserveSpace(code_space_size))) { |
| 511 | Heap::CollectGarbage(code_space_size, CODE_SPACE); |
| 512 | gc_performed = true; |
| 513 | } |
| 514 | if (!(map_space->ReserveSpace(map_space_size))) { |
| 515 | Heap::CollectGarbage(map_space_size, MAP_SPACE); |
| 516 | gc_performed = true; |
| 517 | } |
| 518 | if (!(cell_space->ReserveSpace(cell_space_size))) { |
| 519 | Heap::CollectGarbage(cell_space_size, CELL_SPACE); |
| 520 | gc_performed = true; |
| 521 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 522 | // We add a slack-factor of 2 in order to have space for a series of |
| 523 | // 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] | 524 | large_object_size *= 2; |
| 525 | // The ReserveSpace method on the large object space checks how much |
| 526 | // we can expand the old generation. This includes expansion caused by |
| 527 | // allocation in the other spaces. |
| 528 | large_object_size += cell_space_size + map_space_size + code_space_size + |
| 529 | data_space_size + pointer_space_size; |
| 530 | if (!(lo_space->ReserveSpace(large_object_size))) { |
| 531 | Heap::CollectGarbage(large_object_size, LO_SPACE); |
| 532 | gc_performed = true; |
| 533 | } |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 538 | void Heap::EnsureFromSpaceIsCommitted() { |
| 539 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 540 | |
| 541 | // Committing memory to from space failed. |
| 542 | // Try shrinking and try again. |
| 543 | Shrink(); |
| 544 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 545 | |
| 546 | // Committing memory to from space failed again. |
| 547 | // Memory is exhausted and we will die. |
| 548 | V8::FatalProcessOutOfMemory("Committing semi space failed."); |
| 549 | } |
| 550 | |
| 551 | |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 552 | class ClearThreadJSFunctionResultCachesVisitor: public ThreadVisitor { |
| 553 | virtual void VisitThread(ThreadLocalTop* top) { |
| 554 | Context* context = top->context_; |
| 555 | if (context == NULL) return; |
| 556 | |
| 557 | FixedArray* caches = |
| 558 | context->global()->global_context()->jsfunction_result_caches(); |
| 559 | int length = caches->length(); |
| 560 | for (int i = 0; i < length; i++) { |
| 561 | JSFunctionResultCache::cast(caches->get(i))->Clear(); |
| 562 | } |
| 563 | } |
| 564 | }; |
| 565 | |
| 566 | |
| 567 | void Heap::ClearJSFunctionResultCaches() { |
| 568 | if (Bootstrapper::IsActive()) return; |
| 569 | ClearThreadJSFunctionResultCachesVisitor visitor; |
lrn@chromium.org | 1af7e1b | 2010-06-07 11:12:01 +0000 | [diff] [blame] | 570 | ThreadManager::IterateArchivedThreads(&visitor); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 574 | #ifdef DEBUG |
| 575 | |
| 576 | enum PageWatermarkValidity { |
| 577 | ALL_VALID, |
| 578 | ALL_INVALID |
| 579 | }; |
| 580 | |
| 581 | static void VerifyPageWatermarkValidity(PagedSpace* space, |
| 582 | PageWatermarkValidity validity) { |
| 583 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 584 | bool expected_value = (validity == ALL_VALID); |
| 585 | while (it.has_next()) { |
| 586 | Page* page = it.next(); |
| 587 | ASSERT(page->IsWatermarkValid() == expected_value); |
| 588 | } |
| 589 | } |
| 590 | #endif |
| 591 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 592 | void Heap::UpdateSurvivalRateTrend(int start_new_space_size) { |
| 593 | double survival_rate = |
| 594 | (static_cast<double>(young_survivors_after_last_gc_) * 100) / |
| 595 | start_new_space_size; |
| 596 | |
| 597 | if (survival_rate > kYoungSurvivalRateThreshold) { |
| 598 | high_survival_rate_period_length_++; |
| 599 | } else { |
| 600 | high_survival_rate_period_length_ = 0; |
| 601 | } |
| 602 | |
| 603 | double survival_rate_diff = survival_rate_ - survival_rate; |
| 604 | |
| 605 | if (survival_rate_diff > kYoungSurvivalRateAllowedDeviation) { |
| 606 | set_survival_rate_trend(DECREASING); |
| 607 | } else if (survival_rate_diff < -kYoungSurvivalRateAllowedDeviation) { |
| 608 | set_survival_rate_trend(INCREASING); |
| 609 | } else { |
| 610 | set_survival_rate_trend(STABLE); |
| 611 | } |
| 612 | |
| 613 | survival_rate_ = survival_rate; |
| 614 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 615 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 616 | void Heap::PerformGarbageCollection(AllocationSpace space, |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 617 | GarbageCollector collector, |
| 618 | GCTracer* tracer) { |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 619 | VerifySymbolTable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 620 | if (collector == MARK_COMPACTOR && global_gc_prologue_callback_) { |
| 621 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 622 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 623 | global_gc_prologue_callback_(); |
| 624 | } |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 625 | |
| 626 | GCType gc_type = |
| 627 | collector == MARK_COMPACTOR ? kGCTypeMarkSweepCompact : kGCTypeScavenge; |
| 628 | |
| 629 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 630 | if (gc_type & gc_prologue_callbacks_[i].gc_type) { |
| 631 | gc_prologue_callbacks_[i].callback(gc_type, kNoGCCallbackFlags); |
| 632 | } |
| 633 | } |
| 634 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 635 | EnsureFromSpaceIsCommitted(); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 636 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 637 | int start_new_space_size = Heap::new_space()->Size(); |
| 638 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 639 | if (collector == MARK_COMPACTOR) { |
ricow@chromium.org | 6125555 | 2010-06-11 07:46:10 +0000 | [diff] [blame] | 640 | if (FLAG_flush_code) { |
| 641 | // Flush all potentially unused code. |
fschneider@chromium.org | ed78ffd | 2010-07-21 11:05:19 +0000 | [diff] [blame] | 642 | GCTracer::Scope gc_scope(tracer, GCTracer::Scope::MC_FLUSH_CODE); |
ricow@chromium.org | 6125555 | 2010-06-11 07:46:10 +0000 | [diff] [blame] | 643 | FlushCode(); |
| 644 | } |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 645 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 646 | // Perform mark-sweep with optional compaction. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 647 | MarkCompact(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 648 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 649 | bool high_survival_rate_during_scavenges = IsHighSurvivalRate() && |
| 650 | IsStableOrIncreasingSurvivalTrend(); |
| 651 | |
| 652 | UpdateSurvivalRateTrend(start_new_space_size); |
| 653 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 654 | int old_gen_size = PromotedSpaceSize(); |
| 655 | old_gen_promotion_limit_ = |
| 656 | old_gen_size + Max(kMinimumPromotionLimit, old_gen_size / 3); |
| 657 | old_gen_allocation_limit_ = |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 658 | old_gen_size + Max(kMinimumAllocationLimit, old_gen_size / 2); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 659 | |
| 660 | if (high_survival_rate_during_scavenges && |
| 661 | IsStableOrIncreasingSurvivalTrend()) { |
| 662 | // Stable high survival rates of young objects both during partial and |
| 663 | // full collection indicate that mutator is either building or modifying |
| 664 | // a structure with a long lifetime. |
| 665 | // In this case we aggressively raise old generation memory limits to |
| 666 | // postpone subsequent mark-sweep collection and thus trade memory |
| 667 | // space for the mutation speed. |
| 668 | old_gen_promotion_limit_ *= 2; |
| 669 | old_gen_allocation_limit_ *= 2; |
| 670 | } |
| 671 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 672 | old_gen_exhausted_ = false; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 673 | } else { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 674 | tracer_ = tracer; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 675 | Scavenge(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 676 | tracer_ = NULL; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 677 | |
| 678 | UpdateSurvivalRateTrend(start_new_space_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 679 | } |
ager@chromium.org | 439e85a | 2009-08-26 13:15:29 +0000 | [diff] [blame] | 680 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 681 | Counters::objs_since_last_young.Set(0); |
| 682 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 683 | if (collector == MARK_COMPACTOR) { |
| 684 | DisableAssertNoAllocation allow_allocation; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 685 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 686 | GlobalHandles::PostGarbageCollectionProcessing(); |
| 687 | } |
| 688 | |
| 689 | // Update relocatables. |
| 690 | Relocatable::PostGarbageCollectionProcessing(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 691 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 692 | if (collector == MARK_COMPACTOR) { |
| 693 | // Register the amount of external allocated memory. |
| 694 | amount_of_external_allocated_memory_at_last_global_gc_ = |
| 695 | amount_of_external_allocated_memory_; |
| 696 | } |
| 697 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 698 | GCCallbackFlags callback_flags = tracer->is_compacting() |
| 699 | ? kGCCallbackFlagCompacted |
| 700 | : kNoGCCallbackFlags; |
| 701 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 702 | if (gc_type & gc_epilogue_callbacks_[i].gc_type) { |
| 703 | gc_epilogue_callbacks_[i].callback(gc_type, callback_flags); |
| 704 | } |
| 705 | } |
| 706 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 707 | if (collector == MARK_COMPACTOR && global_gc_epilogue_callback_) { |
| 708 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 709 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 710 | global_gc_epilogue_callback_(); |
| 711 | } |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 712 | VerifySymbolTable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 716 | void Heap::MarkCompact(GCTracer* tracer) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 717 | gc_state_ = MARK_COMPACT; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 718 | LOG(ResourceEvent("markcompact", "begin")); |
| 719 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 720 | MarkCompactCollector::Prepare(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 721 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 722 | bool is_compacting = MarkCompactCollector::IsCompacting(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 723 | |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 724 | if (is_compacting) { |
| 725 | mc_count_++; |
| 726 | } else { |
| 727 | ms_count_++; |
| 728 | } |
| 729 | tracer->set_full_gc_count(mc_count_ + ms_count_); |
| 730 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 731 | MarkCompactPrologue(is_compacting); |
| 732 | |
| 733 | MarkCompactCollector::CollectGarbage(); |
| 734 | |
| 735 | MarkCompactEpilogue(is_compacting); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 736 | |
| 737 | LOG(ResourceEvent("markcompact", "end")); |
| 738 | |
| 739 | gc_state_ = NOT_IN_GC; |
| 740 | |
| 741 | Shrink(); |
| 742 | |
| 743 | Counters::objs_since_last_full.Set(0); |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 744 | |
| 745 | contexts_disposed_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 746 | } |
| 747 | |
| 748 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 749 | void Heap::MarkCompactPrologue(bool is_compacting) { |
| 750 | // At any old GC clear the keyed lookup cache to enable collection of unused |
| 751 | // maps. |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 752 | KeyedLookupCache::Clear(); |
| 753 | ContextSlotCache::Clear(); |
| 754 | DescriptorLookupCache::Clear(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 755 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 756 | CompilationCache::MarkCompactPrologue(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 757 | |
| 758 | Top::MarkCompactPrologue(is_compacting); |
| 759 | ThreadManager::MarkCompactPrologue(is_compacting); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 760 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 761 | CompletelyClearInstanceofCache(); |
| 762 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 763 | if (is_compacting) FlushNumberStringCache(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 767 | void Heap::MarkCompactEpilogue(bool is_compacting) { |
| 768 | Top::MarkCompactEpilogue(is_compacting); |
| 769 | ThreadManager::MarkCompactEpilogue(is_compacting); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | |
| 773 | Object* Heap::FindCodeObject(Address a) { |
| 774 | Object* obj = code_space_->FindObject(a); |
| 775 | if (obj->IsFailure()) { |
| 776 | obj = lo_space_->FindObject(a); |
| 777 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 778 | ASSERT(!obj->IsFailure()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 779 | return obj; |
| 780 | } |
| 781 | |
| 782 | |
| 783 | // Helper class for copying HeapObjects |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 784 | class ScavengeVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 785 | public: |
| 786 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 787 | void VisitPointer(Object** p) { ScavengePointer(p); } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 788 | |
| 789 | void VisitPointers(Object** start, Object** end) { |
| 790 | // Copy all HeapObject pointers in [start, end) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 791 | for (Object** p = start; p < end; p++) ScavengePointer(p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | private: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 795 | void ScavengePointer(Object** p) { |
| 796 | Object* object = *p; |
| 797 | if (!Heap::InNewSpace(object)) return; |
| 798 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 799 | reinterpret_cast<HeapObject*>(object)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 800 | } |
| 801 | }; |
| 802 | |
| 803 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 804 | // A queue of objects promoted during scavenge. Each object is accompanied |
| 805 | // by it's size to avoid dereferencing a map pointer for scanning. |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 806 | class PromotionQueue { |
| 807 | public: |
| 808 | void Initialize(Address start_address) { |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 809 | front_ = rear_ = reinterpret_cast<intptr_t*>(start_address); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | bool is_empty() { return front_ <= rear_; } |
| 813 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 814 | void insert(HeapObject* target, int size) { |
| 815 | *(--rear_) = reinterpret_cast<intptr_t>(target); |
| 816 | *(--rear_) = size; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 817 | // Assert no overflow into live objects. |
| 818 | ASSERT(reinterpret_cast<Address>(rear_) >= Heap::new_space()->top()); |
| 819 | } |
| 820 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 821 | void remove(HeapObject** target, int* size) { |
| 822 | *target = reinterpret_cast<HeapObject*>(*(--front_)); |
| 823 | *size = static_cast<int>(*(--front_)); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 824 | // Assert no underflow. |
| 825 | ASSERT(front_ >= rear_); |
| 826 | } |
| 827 | |
| 828 | private: |
| 829 | // The front of the queue is higher in memory than the rear. |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 830 | intptr_t* front_; |
| 831 | intptr_t* rear_; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 832 | }; |
| 833 | |
| 834 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 835 | // Shared state read by the scavenge collector and set by ScavengeObject. |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 836 | static PromotionQueue promotion_queue; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 837 | |
| 838 | |
| 839 | #ifdef DEBUG |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 840 | // 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] | 841 | // new space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 842 | class VerifyNonPointerSpacePointersVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 843 | public: |
| 844 | void VisitPointers(Object** start, Object**end) { |
| 845 | for (Object** current = start; current < end; current++) { |
| 846 | if ((*current)->IsHeapObject()) { |
| 847 | ASSERT(!Heap::InNewSpace(HeapObject::cast(*current))); |
| 848 | } |
| 849 | } |
| 850 | } |
| 851 | }; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 852 | |
| 853 | |
| 854 | static void VerifyNonPointerSpacePointers() { |
| 855 | // Verify that there are no pointers to new space in spaces where we |
| 856 | // do not expect them. |
| 857 | VerifyNonPointerSpacePointersVisitor v; |
| 858 | HeapObjectIterator code_it(Heap::code_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 859 | for (HeapObject* object = code_it.next(); |
| 860 | object != NULL; object = code_it.next()) |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 861 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 862 | |
| 863 | HeapObjectIterator data_it(Heap::old_data_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 864 | for (HeapObject* object = data_it.next(); |
| 865 | object != NULL; object = data_it.next()) |
| 866 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 867 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 868 | #endif |
| 869 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 870 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 871 | void Heap::CheckNewSpaceExpansionCriteria() { |
| 872 | if (new_space_.Capacity() < new_space_.MaximumCapacity() && |
| 873 | survived_since_last_expansion_ > new_space_.Capacity()) { |
| 874 | // Grow the size of new space if there is room to grow and enough |
| 875 | // data has survived scavenge since the last expansion. |
| 876 | new_space_.Grow(); |
| 877 | survived_since_last_expansion_ = 0; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 882 | void Heap::Scavenge() { |
| 883 | #ifdef DEBUG |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 884 | if (FLAG_enable_slow_asserts) VerifyNonPointerSpacePointers(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 885 | #endif |
| 886 | |
| 887 | gc_state_ = SCAVENGE; |
| 888 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 889 | Page::FlipMeaningOfInvalidatedWatermarkFlag(); |
| 890 | #ifdef DEBUG |
| 891 | VerifyPageWatermarkValidity(old_pointer_space_, ALL_VALID); |
| 892 | VerifyPageWatermarkValidity(map_space_, ALL_VALID); |
| 893 | #endif |
| 894 | |
| 895 | // We do not update an allocation watermark of the top page during linear |
| 896 | // allocation to avoid overhead. So to maintain the watermark invariant |
| 897 | // we have to manually cache the watermark and mark the top page as having an |
| 898 | // invalid watermark. This guarantees that dirty regions iteration will use a |
| 899 | // correct watermark even if a linear allocation happens. |
| 900 | old_pointer_space_->FlushTopPageWatermark(); |
| 901 | map_space_->FlushTopPageWatermark(); |
| 902 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 903 | // Implements Cheney's copying algorithm |
| 904 | LOG(ResourceEvent("scavenge", "begin")); |
| 905 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 906 | // Clear descriptor cache. |
| 907 | DescriptorLookupCache::Clear(); |
| 908 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 909 | // Used for updating survived_since_last_expansion_ at function end. |
| 910 | int survived_watermark = PromotedSpaceSize(); |
| 911 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 912 | CheckNewSpaceExpansionCriteria(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 913 | |
| 914 | // Flip the semispaces. After flipping, to space is empty, from space has |
| 915 | // live objects. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 916 | new_space_.Flip(); |
| 917 | new_space_.ResetAllocationInfo(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 918 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 919 | // We need to sweep newly copied objects which can be either in the |
| 920 | // to space or promoted to the old generation. For to-space |
| 921 | // objects, we treat the bottom of the to space as a queue. Newly |
| 922 | // copied and unswept objects lie between a 'front' mark and the |
| 923 | // allocation pointer. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 924 | // |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 925 | // Promoted objects can go into various old-generation spaces, and |
| 926 | // can be allocated internally in the spaces (from the free list). |
| 927 | // We treat the top of the to space as a queue of addresses of |
| 928 | // promoted objects. The addresses of newly promoted and unswept |
| 929 | // objects lie between a 'front' mark and a 'rear' mark that is |
| 930 | // updated as a side effect of promoting an object. |
| 931 | // |
| 932 | // There is guaranteed to be enough room at the top of the to space |
| 933 | // for the addresses of promoted objects: every object promoted |
| 934 | // frees up its size in bytes from the top of the new space, and |
| 935 | // objects are at least one pointer in size. |
| 936 | Address new_space_front = new_space_.ToSpaceLow(); |
| 937 | promotion_queue.Initialize(new_space_.ToSpaceHigh()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 938 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 939 | ScavengeVisitor scavenge_visitor; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 940 | // Copy roots. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 941 | IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 942 | |
| 943 | // Copy objects reachable from the old generation. By definition, |
| 944 | // there are no intergenerational pointers in code or data spaces. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 945 | IterateDirtyRegions(old_pointer_space_, |
| 946 | &IteratePointersInDirtyRegion, |
| 947 | &ScavengePointer, |
| 948 | WATERMARK_CAN_BE_INVALID); |
| 949 | |
| 950 | IterateDirtyRegions(map_space_, |
| 951 | &IteratePointersInDirtyMapsRegion, |
| 952 | &ScavengePointer, |
| 953 | WATERMARK_CAN_BE_INVALID); |
| 954 | |
| 955 | lo_space_->IterateDirtyRegions(&ScavengePointer); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 956 | |
| 957 | // Copy objects reachable from cells by scavenging cell values directly. |
| 958 | HeapObjectIterator cell_iterator(cell_space_); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 959 | for (HeapObject* cell = cell_iterator.next(); |
| 960 | cell != NULL; cell = cell_iterator.next()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 961 | if (cell->IsJSGlobalPropertyCell()) { |
| 962 | Address value_address = |
| 963 | reinterpret_cast<Address>(cell) + |
| 964 | (JSGlobalPropertyCell::kValueOffset - kHeapObjectTag); |
| 965 | scavenge_visitor.VisitPointer(reinterpret_cast<Object**>(value_address)); |
| 966 | } |
| 967 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 968 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 969 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
| 970 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 971 | UpdateNewSpaceReferencesInExternalStringTable( |
| 972 | &UpdateNewSpaceReferenceInExternalStringTableEntry); |
| 973 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 974 | ASSERT(new_space_front == new_space_.top()); |
| 975 | |
| 976 | // Set age mark. |
| 977 | new_space_.set_age_mark(new_space_.top()); |
| 978 | |
| 979 | // Update how much has survived scavenge. |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 980 | IncrementYoungSurvivorsCounter( |
| 981 | (PromotedSpaceSize() - survived_watermark) + new_space_.Size()); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 982 | |
| 983 | LOG(ResourceEvent("scavenge", "end")); |
| 984 | |
| 985 | gc_state_ = NOT_IN_GC; |
| 986 | } |
| 987 | |
| 988 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 989 | String* Heap::UpdateNewSpaceReferenceInExternalStringTableEntry(Object** p) { |
| 990 | MapWord first_word = HeapObject::cast(*p)->map_word(); |
| 991 | |
| 992 | if (!first_word.IsForwardingAddress()) { |
| 993 | // Unreachable external string can be finalized. |
| 994 | FinalizeExternalString(String::cast(*p)); |
| 995 | return NULL; |
| 996 | } |
| 997 | |
| 998 | // String is still reachable. |
| 999 | return String::cast(first_word.ToForwardingAddress()); |
| 1000 | } |
| 1001 | |
| 1002 | |
| 1003 | void Heap::UpdateNewSpaceReferencesInExternalStringTable( |
| 1004 | ExternalStringTableUpdaterCallback updater_func) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1005 | ExternalStringTable::Verify(); |
| 1006 | |
| 1007 | if (ExternalStringTable::new_space_strings_.is_empty()) return; |
| 1008 | |
| 1009 | Object** start = &ExternalStringTable::new_space_strings_[0]; |
| 1010 | Object** end = start + ExternalStringTable::new_space_strings_.length(); |
| 1011 | Object** last = start; |
| 1012 | |
| 1013 | for (Object** p = start; p < end; ++p) { |
| 1014 | ASSERT(Heap::InFromSpace(*p)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1015 | String* target = updater_func(p); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1016 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1017 | if (target == NULL) continue; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1018 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1019 | ASSERT(target->IsExternalString()); |
| 1020 | |
| 1021 | if (Heap::InNewSpace(target)) { |
| 1022 | // String is still in new space. Update the table entry. |
| 1023 | *last = target; |
| 1024 | ++last; |
| 1025 | } else { |
| 1026 | // String got promoted. Move it to the old string list. |
| 1027 | ExternalStringTable::AddOldString(target); |
| 1028 | } |
| 1029 | } |
| 1030 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1031 | ASSERT(last <= end); |
| 1032 | ExternalStringTable::ShrinkNewStrings(static_cast<int>(last - start)); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1036 | class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> { |
| 1037 | public: |
| 1038 | static inline void VisitPointer(Object** p) { |
| 1039 | Object* object = *p; |
| 1040 | if (!Heap::InNewSpace(object)) return; |
| 1041 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 1042 | reinterpret_cast<HeapObject*>(object)); |
| 1043 | } |
| 1044 | }; |
| 1045 | |
| 1046 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1047 | Address Heap::DoScavenge(ObjectVisitor* scavenge_visitor, |
| 1048 | Address new_space_front) { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1049 | do { |
| 1050 | ASSERT(new_space_front <= new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1051 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1052 | // The addresses new_space_front and new_space_.top() define a |
| 1053 | // queue of unprocessed copied objects. Process them until the |
| 1054 | // queue is empty. |
| 1055 | while (new_space_front < new_space_.top()) { |
| 1056 | HeapObject* object = HeapObject::FromAddress(new_space_front); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1057 | new_space_front += NewSpaceScavenger::IterateBody(object->map(), object); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1058 | } |
| 1059 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1060 | // Promote and process all the to-be-promoted objects. |
| 1061 | while (!promotion_queue.is_empty()) { |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1062 | HeapObject* target; |
| 1063 | int size; |
| 1064 | promotion_queue.remove(&target, &size); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1065 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1066 | // Promoted object might be already partially visited |
| 1067 | // during dirty regions iteration. Thus we search specificly |
| 1068 | // for pointers to from semispace instead of looking for pointers |
| 1069 | // to new space. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1070 | ASSERT(!target->IsMap()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1071 | IterateAndMarkPointersToFromSpace(target->address(), |
| 1072 | target->address() + size, |
| 1073 | &ScavengePointer); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1074 | } |
| 1075 | |
| 1076 | // Take another spin if there are now unswept objects in new space |
| 1077 | // (there are currently no more unswept promoted objects). |
| 1078 | } while (new_space_front < new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1079 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1080 | return new_space_front; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1081 | } |
| 1082 | |
| 1083 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1084 | class ScavengingVisitor : public StaticVisitorBase { |
| 1085 | public: |
| 1086 | static void Initialize() { |
| 1087 | table_.Register(kVisitSeqAsciiString, &EvacuateSeqAsciiString); |
| 1088 | table_.Register(kVisitSeqTwoByteString, &EvacuateSeqTwoByteString); |
| 1089 | table_.Register(kVisitShortcutCandidate, &EvacuateShortcutCandidate); |
| 1090 | table_.Register(kVisitByteArray, &EvacuateByteArray); |
| 1091 | table_.Register(kVisitFixedArray, &EvacuateFixedArray); |
| 1092 | |
| 1093 | typedef ObjectEvacuationStrategy<POINTER_OBJECT> PointerObject; |
| 1094 | |
| 1095 | table_.Register(kVisitConsString, |
| 1096 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1097 | VisitSpecialized<ConsString::kSize>); |
| 1098 | |
| 1099 | table_.Register(kVisitSharedFunctionInfo, |
| 1100 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1101 | VisitSpecialized<SharedFunctionInfo::kSize>); |
| 1102 | |
| 1103 | table_.RegisterSpecializations<ObjectEvacuationStrategy<DATA_OBJECT>, |
| 1104 | kVisitDataObject, |
| 1105 | kVisitDataObjectGeneric>(); |
| 1106 | |
| 1107 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1108 | kVisitJSObject, |
| 1109 | kVisitJSObjectGeneric>(); |
| 1110 | |
| 1111 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1112 | kVisitStruct, |
| 1113 | kVisitStructGeneric>(); |
| 1114 | } |
| 1115 | |
| 1116 | |
| 1117 | static inline void Scavenge(Map* map, HeapObject** slot, HeapObject* obj) { |
| 1118 | table_.GetVisitor(map)(map, slot, obj); |
| 1119 | } |
| 1120 | |
| 1121 | |
| 1122 | private: |
| 1123 | enum ObjectContents { DATA_OBJECT, POINTER_OBJECT }; |
| 1124 | enum SizeRestriction { SMALL, UNKNOWN_SIZE }; |
| 1125 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1126 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1127 | static void RecordCopiedObject(HeapObject* obj) { |
| 1128 | bool should_record = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1129 | #ifdef DEBUG |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1130 | should_record = FLAG_heap_stats; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1131 | #endif |
| 1132 | #ifdef ENABLE_LOGGING_AND_PROFILING |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1133 | should_record = should_record || FLAG_log_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1134 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1135 | if (should_record) { |
| 1136 | if (Heap::new_space()->Contains(obj)) { |
| 1137 | Heap::new_space()->RecordAllocation(obj); |
| 1138 | } else { |
| 1139 | Heap::new_space()->RecordPromotion(obj); |
| 1140 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1141 | } |
| 1142 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1143 | #endif // defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 1144 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1145 | // Helper function used by CopyObject to copy a source object to an |
| 1146 | // allocated target object and update the forwarding pointer in the source |
| 1147 | // object. Returns the target object. |
| 1148 | INLINE(static HeapObject* MigrateObject(HeapObject* source, |
| 1149 | HeapObject* target, |
| 1150 | int size)) { |
| 1151 | // Copy the content of source to target. |
| 1152 | Heap::CopyBlock(target->address(), source->address(), size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1153 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1154 | // Set the forwarding address. |
| 1155 | source->set_map_word(MapWord::FromForwardingAddress(target)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1156 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1157 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1158 | // Update NewSpace stats if necessary. |
| 1159 | RecordCopiedObject(target); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1160 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1161 | HEAP_PROFILE(ObjectMoveEvent(source->address(), target->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1162 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1163 | return target; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1164 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1165 | |
| 1166 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1167 | template<ObjectContents object_contents, SizeRestriction size_restriction> |
| 1168 | static inline void EvacuateObject(Map* map, |
| 1169 | HeapObject** slot, |
| 1170 | HeapObject* object, |
| 1171 | int object_size) { |
| 1172 | ASSERT((size_restriction != SMALL) || |
| 1173 | (object_size <= Page::kMaxHeapObjectSize)); |
| 1174 | ASSERT(object->Size() == object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1175 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1176 | if (Heap::ShouldBePromoted(object->address(), object_size)) { |
| 1177 | Object* result; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1178 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1179 | if ((size_restriction != SMALL) && |
| 1180 | (object_size > Page::kMaxHeapObjectSize)) { |
| 1181 | result = Heap::lo_space()->AllocateRawFixedArray(object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1182 | } else { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1183 | if (object_contents == DATA_OBJECT) { |
| 1184 | result = Heap::old_data_space()->AllocateRaw(object_size); |
| 1185 | } else { |
| 1186 | result = Heap::old_pointer_space()->AllocateRaw(object_size); |
| 1187 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1188 | } |
| 1189 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1190 | if (!result->IsFailure()) { |
| 1191 | HeapObject* target = HeapObject::cast(result); |
| 1192 | *slot = MigrateObject(object, target, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1193 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1194 | if (object_contents == POINTER_OBJECT) { |
| 1195 | promotion_queue.insert(target, object_size); |
| 1196 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1197 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1198 | Heap::tracer()->increment_promoted_objects_size(object_size); |
| 1199 | return; |
| 1200 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1201 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1202 | Object* result = Heap::new_space()->AllocateRaw(object_size); |
| 1203 | ASSERT(!result->IsFailure()); |
| 1204 | *slot = MigrateObject(object, HeapObject::cast(result), object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1205 | return; |
| 1206 | } |
| 1207 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1208 | |
| 1209 | static inline void EvacuateFixedArray(Map* map, |
| 1210 | HeapObject** slot, |
| 1211 | HeapObject* object) { |
| 1212 | int object_size = FixedArray::BodyDescriptor::SizeOf(map, object); |
| 1213 | EvacuateObject<POINTER_OBJECT, UNKNOWN_SIZE>(map, |
| 1214 | slot, |
| 1215 | object, |
| 1216 | object_size); |
| 1217 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1218 | |
| 1219 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1220 | static inline void EvacuateByteArray(Map* map, |
| 1221 | HeapObject** slot, |
| 1222 | HeapObject* object) { |
| 1223 | int object_size = reinterpret_cast<ByteArray*>(object)->ByteArraySize(); |
| 1224 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1225 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1226 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1227 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1228 | static inline void EvacuateSeqAsciiString(Map* map, |
| 1229 | HeapObject** slot, |
| 1230 | HeapObject* object) { |
| 1231 | int object_size = SeqAsciiString::cast(object)-> |
| 1232 | SeqAsciiStringSize(map->instance_type()); |
| 1233 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1234 | } |
| 1235 | |
| 1236 | |
| 1237 | static inline void EvacuateSeqTwoByteString(Map* map, |
| 1238 | HeapObject** slot, |
| 1239 | HeapObject* object) { |
| 1240 | int object_size = SeqTwoByteString::cast(object)-> |
| 1241 | SeqTwoByteStringSize(map->instance_type()); |
| 1242 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1243 | } |
| 1244 | |
| 1245 | |
| 1246 | static inline bool IsShortcutCandidate(int type) { |
| 1247 | return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| 1248 | } |
| 1249 | |
| 1250 | static inline void EvacuateShortcutCandidate(Map* map, |
| 1251 | HeapObject** slot, |
| 1252 | HeapObject* object) { |
| 1253 | ASSERT(IsShortcutCandidate(map->instance_type())); |
| 1254 | |
| 1255 | if (ConsString::cast(object)->unchecked_second() == Heap::empty_string()) { |
| 1256 | HeapObject* first = |
| 1257 | HeapObject::cast(ConsString::cast(object)->unchecked_first()); |
| 1258 | |
| 1259 | *slot = first; |
| 1260 | |
| 1261 | if (!Heap::InNewSpace(first)) { |
| 1262 | object->set_map_word(MapWord::FromForwardingAddress(first)); |
| 1263 | return; |
| 1264 | } |
| 1265 | |
| 1266 | MapWord first_word = first->map_word(); |
| 1267 | if (first_word.IsForwardingAddress()) { |
| 1268 | HeapObject* target = first_word.ToForwardingAddress(); |
| 1269 | |
| 1270 | *slot = target; |
| 1271 | object->set_map_word(MapWord::FromForwardingAddress(target)); |
| 1272 | return; |
| 1273 | } |
| 1274 | |
| 1275 | Scavenge(first->map(), slot, first); |
| 1276 | object->set_map_word(MapWord::FromForwardingAddress(*slot)); |
| 1277 | return; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1278 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1279 | |
| 1280 | int object_size = ConsString::kSize; |
| 1281 | EvacuateObject<POINTER_OBJECT, SMALL>(map, slot, object, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1282 | } |
| 1283 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1284 | template<ObjectContents object_contents> |
| 1285 | class ObjectEvacuationStrategy { |
| 1286 | public: |
| 1287 | template<int object_size> |
| 1288 | static inline void VisitSpecialized(Map* map, |
| 1289 | HeapObject** slot, |
| 1290 | HeapObject* object) { |
| 1291 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1292 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1293 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1294 | static inline void Visit(Map* map, |
| 1295 | HeapObject** slot, |
| 1296 | HeapObject* object) { |
| 1297 | int object_size = map->instance_size(); |
| 1298 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1299 | } |
| 1300 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1301 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1302 | typedef void (*Callback)(Map* map, HeapObject** slot, HeapObject* object); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1303 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1304 | static VisitorDispatchTable<Callback> table_; |
| 1305 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1306 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1307 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1308 | VisitorDispatchTable<ScavengingVisitor::Callback> ScavengingVisitor::table_; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1309 | |
| 1310 | |
| 1311 | void Heap::ScavengeObjectSlow(HeapObject** p, HeapObject* object) { |
| 1312 | ASSERT(InFromSpace(object)); |
| 1313 | MapWord first_word = object->map_word(); |
| 1314 | ASSERT(!first_word.IsForwardingAddress()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1315 | Map* map = first_word.ToMap(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1316 | ScavengingVisitor::Scavenge(map, p, object); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1317 | } |
| 1318 | |
| 1319 | |
| 1320 | void Heap::ScavengePointer(HeapObject** p) { |
| 1321 | ScavengeObject(p, *p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1322 | } |
| 1323 | |
| 1324 | |
| 1325 | Object* Heap::AllocatePartialMap(InstanceType instance_type, |
| 1326 | int instance_size) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1327 | Object* result = AllocateRawMap(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1328 | if (result->IsFailure()) return result; |
| 1329 | |
| 1330 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1331 | reinterpret_cast<Map*>(result)->set_map(raw_unchecked_meta_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1332 | reinterpret_cast<Map*>(result)->set_instance_type(instance_type); |
| 1333 | reinterpret_cast<Map*>(result)->set_instance_size(instance_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1334 | reinterpret_cast<Map*>(result)-> |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1335 | set_visitor_id( |
| 1336 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1337 | reinterpret_cast<Map*>(result)->set_inobject_properties(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1338 | reinterpret_cast<Map*>(result)->set_pre_allocated_property_fields(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1339 | reinterpret_cast<Map*>(result)->set_unused_property_fields(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1340 | reinterpret_cast<Map*>(result)->set_bit_field(0); |
| 1341 | reinterpret_cast<Map*>(result)->set_bit_field2(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1342 | return result; |
| 1343 | } |
| 1344 | |
| 1345 | |
| 1346 | Object* Heap::AllocateMap(InstanceType instance_type, int instance_size) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1347 | Object* result = AllocateRawMap(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1348 | if (result->IsFailure()) return result; |
| 1349 | |
| 1350 | Map* map = reinterpret_cast<Map*>(result); |
| 1351 | map->set_map(meta_map()); |
| 1352 | map->set_instance_type(instance_type); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 1353 | map->set_visitor_id( |
| 1354 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1355 | map->set_prototype(null_value()); |
| 1356 | map->set_constructor(null_value()); |
| 1357 | map->set_instance_size(instance_size); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1358 | map->set_inobject_properties(0); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1359 | map->set_pre_allocated_property_fields(0); |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1360 | map->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1361 | map->set_code_cache(empty_fixed_array()); |
| 1362 | map->set_unused_property_fields(0); |
| 1363 | map->set_bit_field(0); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 1364 | map->set_bit_field2((1 << Map::kIsExtensible) | (1 << Map::kHasFastElements)); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 1365 | |
| 1366 | // If the map object is aligned fill the padding area with Smi 0 objects. |
| 1367 | if (Map::kPadStart < Map::kSize) { |
| 1368 | memset(reinterpret_cast<byte*>(map) + Map::kPadStart - kHeapObjectTag, |
| 1369 | 0, |
| 1370 | Map::kSize - Map::kPadStart); |
| 1371 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1372 | return map; |
| 1373 | } |
| 1374 | |
| 1375 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1376 | Object* Heap::AllocateCodeCache() { |
| 1377 | Object* result = AllocateStruct(CODE_CACHE_TYPE); |
| 1378 | if (result->IsFailure()) return result; |
| 1379 | CodeCache* code_cache = CodeCache::cast(result); |
| 1380 | code_cache->set_default_cache(empty_fixed_array()); |
| 1381 | code_cache->set_normal_type_cache(undefined_value()); |
| 1382 | return code_cache; |
| 1383 | } |
| 1384 | |
| 1385 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1386 | const Heap::StringTypeTable Heap::string_type_table[] = { |
| 1387 | #define STRING_TYPE_ELEMENT(type, size, name, camel_name) \ |
| 1388 | {type, size, k##camel_name##MapRootIndex}, |
| 1389 | STRING_TYPE_LIST(STRING_TYPE_ELEMENT) |
| 1390 | #undef STRING_TYPE_ELEMENT |
| 1391 | }; |
| 1392 | |
| 1393 | |
| 1394 | const Heap::ConstantSymbolTable Heap::constant_symbol_table[] = { |
| 1395 | #define CONSTANT_SYMBOL_ELEMENT(name, contents) \ |
| 1396 | {contents, k##name##RootIndex}, |
| 1397 | SYMBOL_LIST(CONSTANT_SYMBOL_ELEMENT) |
| 1398 | #undef CONSTANT_SYMBOL_ELEMENT |
| 1399 | }; |
| 1400 | |
| 1401 | |
| 1402 | const Heap::StructTable Heap::struct_table[] = { |
| 1403 | #define STRUCT_TABLE_ELEMENT(NAME, Name, name) \ |
| 1404 | { NAME##_TYPE, Name::kSize, k##Name##MapRootIndex }, |
| 1405 | STRUCT_LIST(STRUCT_TABLE_ELEMENT) |
| 1406 | #undef STRUCT_TABLE_ELEMENT |
| 1407 | }; |
| 1408 | |
| 1409 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1410 | bool Heap::CreateInitialMaps() { |
| 1411 | Object* obj = AllocatePartialMap(MAP_TYPE, Map::kSize); |
| 1412 | if (obj->IsFailure()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1413 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1414 | Map* new_meta_map = reinterpret_cast<Map*>(obj); |
| 1415 | set_meta_map(new_meta_map); |
| 1416 | new_meta_map->set_map(new_meta_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1417 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 1418 | obj = AllocatePartialMap(FIXED_ARRAY_TYPE, FixedArray::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1419 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1420 | set_fixed_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1421 | |
| 1422 | obj = AllocatePartialMap(ODDBALL_TYPE, Oddball::kSize); |
| 1423 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1424 | set_oddball_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1425 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 1426 | // Allocate the empty array. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1427 | obj = AllocateEmptyFixedArray(); |
| 1428 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1429 | set_empty_fixed_array(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1430 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1431 | obj = Allocate(oddball_map(), OLD_DATA_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1432 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1433 | set_null_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1434 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1435 | // Allocate the empty descriptor array. |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1436 | obj = AllocateEmptyFixedArray(); |
| 1437 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1438 | set_empty_descriptor_array(DescriptorArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1439 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1440 | // Fix the instance_descriptors for the existing maps. |
| 1441 | meta_map()->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1442 | meta_map()->set_code_cache(empty_fixed_array()); |
| 1443 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1444 | fixed_array_map()->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1445 | fixed_array_map()->set_code_cache(empty_fixed_array()); |
| 1446 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1447 | oddball_map()->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1448 | oddball_map()->set_code_cache(empty_fixed_array()); |
| 1449 | |
| 1450 | // Fix prototype object for existing maps. |
| 1451 | meta_map()->set_prototype(null_value()); |
| 1452 | meta_map()->set_constructor(null_value()); |
| 1453 | |
| 1454 | fixed_array_map()->set_prototype(null_value()); |
| 1455 | fixed_array_map()->set_constructor(null_value()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1456 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1457 | oddball_map()->set_prototype(null_value()); |
| 1458 | oddball_map()->set_constructor(null_value()); |
| 1459 | |
| 1460 | obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize); |
| 1461 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1462 | set_heap_number_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1463 | |
| 1464 | obj = AllocateMap(PROXY_TYPE, Proxy::kSize); |
| 1465 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1466 | set_proxy_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1467 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1468 | for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) { |
| 1469 | const StringTypeTable& entry = string_type_table[i]; |
| 1470 | obj = AllocateMap(entry.type, entry.size); |
| 1471 | if (obj->IsFailure()) return false; |
| 1472 | roots_[entry.index] = Map::cast(obj); |
| 1473 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1474 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1475 | obj = AllocateMap(STRING_TYPE, SeqTwoByteString::kAlignedSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1476 | if (obj->IsFailure()) return false; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1477 | set_undetectable_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1478 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1479 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1480 | obj = AllocateMap(ASCII_STRING_TYPE, SeqAsciiString::kAlignedSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1481 | if (obj->IsFailure()) return false; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1482 | set_undetectable_ascii_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1483 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1484 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 1485 | obj = AllocateMap(BYTE_ARRAY_TYPE, ByteArray::kAlignedSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1486 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1487 | set_byte_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1488 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1489 | obj = AllocateMap(PIXEL_ARRAY_TYPE, PixelArray::kAlignedSize); |
| 1490 | if (obj->IsFailure()) return false; |
| 1491 | set_pixel_array_map(Map::cast(obj)); |
| 1492 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1493 | obj = AllocateMap(EXTERNAL_BYTE_ARRAY_TYPE, |
| 1494 | ExternalArray::kAlignedSize); |
| 1495 | if (obj->IsFailure()) return false; |
| 1496 | set_external_byte_array_map(Map::cast(obj)); |
| 1497 | |
| 1498 | obj = AllocateMap(EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE, |
| 1499 | ExternalArray::kAlignedSize); |
| 1500 | if (obj->IsFailure()) return false; |
| 1501 | set_external_unsigned_byte_array_map(Map::cast(obj)); |
| 1502 | |
| 1503 | obj = AllocateMap(EXTERNAL_SHORT_ARRAY_TYPE, |
| 1504 | ExternalArray::kAlignedSize); |
| 1505 | if (obj->IsFailure()) return false; |
| 1506 | set_external_short_array_map(Map::cast(obj)); |
| 1507 | |
| 1508 | obj = AllocateMap(EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE, |
| 1509 | ExternalArray::kAlignedSize); |
| 1510 | if (obj->IsFailure()) return false; |
| 1511 | set_external_unsigned_short_array_map(Map::cast(obj)); |
| 1512 | |
| 1513 | obj = AllocateMap(EXTERNAL_INT_ARRAY_TYPE, |
| 1514 | ExternalArray::kAlignedSize); |
| 1515 | if (obj->IsFailure()) return false; |
| 1516 | set_external_int_array_map(Map::cast(obj)); |
| 1517 | |
| 1518 | obj = AllocateMap(EXTERNAL_UNSIGNED_INT_ARRAY_TYPE, |
| 1519 | ExternalArray::kAlignedSize); |
| 1520 | if (obj->IsFailure()) return false; |
| 1521 | set_external_unsigned_int_array_map(Map::cast(obj)); |
| 1522 | |
| 1523 | obj = AllocateMap(EXTERNAL_FLOAT_ARRAY_TYPE, |
| 1524 | ExternalArray::kAlignedSize); |
| 1525 | if (obj->IsFailure()) return false; |
| 1526 | set_external_float_array_map(Map::cast(obj)); |
| 1527 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1528 | obj = AllocateMap(CODE_TYPE, Code::kHeaderSize); |
| 1529 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1530 | set_code_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1531 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1532 | obj = AllocateMap(JS_GLOBAL_PROPERTY_CELL_TYPE, |
| 1533 | JSGlobalPropertyCell::kSize); |
| 1534 | if (obj->IsFailure()) return false; |
| 1535 | set_global_property_cell_map(Map::cast(obj)); |
| 1536 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1537 | obj = AllocateMap(FILLER_TYPE, kPointerSize); |
| 1538 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1539 | set_one_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1540 | |
| 1541 | obj = AllocateMap(FILLER_TYPE, 2 * kPointerSize); |
| 1542 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1543 | set_two_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1544 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1545 | for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) { |
| 1546 | const StructTable& entry = struct_table[i]; |
| 1547 | obj = AllocateMap(entry.type, entry.size); |
| 1548 | if (obj->IsFailure()) return false; |
| 1549 | roots_[entry.index] = Map::cast(obj); |
| 1550 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1551 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 1552 | obj = AllocateMap(FIXED_ARRAY_TYPE, HeapObject::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1553 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1554 | set_hash_table_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1555 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 1556 | obj = AllocateMap(FIXED_ARRAY_TYPE, HeapObject::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1557 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1558 | set_context_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1559 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 1560 | obj = AllocateMap(FIXED_ARRAY_TYPE, HeapObject::kHeaderSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1561 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1562 | set_catch_context_map(Map::cast(obj)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1563 | |
| 1564 | obj = AllocateMap(FIXED_ARRAY_TYPE, HeapObject::kHeaderSize); |
| 1565 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1566 | set_global_context_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1567 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 1568 | obj = AllocateMap(SHARED_FUNCTION_INFO_TYPE, |
| 1569 | SharedFunctionInfo::kAlignedSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1570 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1571 | set_shared_function_info_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1572 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1573 | ASSERT(!Heap::InNewSpace(Heap::empty_fixed_array())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1574 | return true; |
| 1575 | } |
| 1576 | |
| 1577 | |
| 1578 | Object* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) { |
| 1579 | // Statically ensure that it is safe to allocate heap numbers in paged |
| 1580 | // spaces. |
| 1581 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1582 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1583 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1584 | Object* result = AllocateRaw(HeapNumber::kSize, space, OLD_DATA_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1585 | if (result->IsFailure()) return result; |
| 1586 | |
| 1587 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 1588 | HeapNumber::cast(result)->set_value(value); |
| 1589 | return result; |
| 1590 | } |
| 1591 | |
| 1592 | |
| 1593 | Object* Heap::AllocateHeapNumber(double value) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1594 | // Use general version, if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1595 | if (always_allocate()) return AllocateHeapNumber(value, TENURED); |
| 1596 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1597 | // This version of AllocateHeapNumber is optimized for |
| 1598 | // allocation in new space. |
| 1599 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
| 1600 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1601 | Object* result = new_space_.AllocateRaw(HeapNumber::kSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1602 | if (result->IsFailure()) return result; |
| 1603 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 1604 | HeapNumber::cast(result)->set_value(value); |
| 1605 | return result; |
| 1606 | } |
| 1607 | |
| 1608 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1609 | Object* Heap::AllocateJSGlobalPropertyCell(Object* value) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1610 | Object* result = AllocateRawCell(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1611 | if (result->IsFailure()) return result; |
| 1612 | HeapObject::cast(result)->set_map(global_property_cell_map()); |
| 1613 | JSGlobalPropertyCell::cast(result)->set_value(value); |
| 1614 | return result; |
| 1615 | } |
| 1616 | |
| 1617 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1618 | Object* Heap::CreateOddball(const char* to_string, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1619 | Object* to_number) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1620 | Object* result = Allocate(oddball_map(), OLD_DATA_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1621 | if (result->IsFailure()) return result; |
| 1622 | return Oddball::cast(result)->Initialize(to_string, to_number); |
| 1623 | } |
| 1624 | |
| 1625 | |
| 1626 | bool Heap::CreateApiObjects() { |
| 1627 | Object* obj; |
| 1628 | |
| 1629 | obj = AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| 1630 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1631 | set_neander_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1632 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1633 | obj = Heap::AllocateJSObjectFromMap(neander_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1634 | if (obj->IsFailure()) return false; |
| 1635 | Object* elements = AllocateFixedArray(2); |
| 1636 | if (elements->IsFailure()) return false; |
| 1637 | FixedArray::cast(elements)->set(0, Smi::FromInt(0)); |
| 1638 | JSObject::cast(obj)->set_elements(FixedArray::cast(elements)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1639 | set_message_listeners(JSObject::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1640 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1641 | return true; |
| 1642 | } |
| 1643 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1644 | |
| 1645 | void Heap::CreateCEntryStub() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 1646 | CEntryStub stub(1); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1647 | set_c_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1648 | } |
| 1649 | |
| 1650 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1651 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1652 | void Heap::CreateRegExpCEntryStub() { |
| 1653 | RegExpCEntryStub stub; |
| 1654 | set_re_c_entry_code(*stub.GetCode()); |
| 1655 | } |
| 1656 | #endif |
| 1657 | |
| 1658 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1659 | void Heap::CreateJSEntryStub() { |
| 1660 | JSEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1661 | set_js_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1662 | } |
| 1663 | |
| 1664 | |
| 1665 | void Heap::CreateJSConstructEntryStub() { |
| 1666 | JSConstructEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1667 | set_js_construct_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1668 | } |
| 1669 | |
| 1670 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1671 | void Heap::CreateFixedStubs() { |
| 1672 | // Here we create roots for fixed stubs. They are needed at GC |
| 1673 | // for cooking and uncooking (check out frames.cc). |
| 1674 | // The eliminates the need for doing dictionary lookup in the |
| 1675 | // stub cache for these stubs. |
| 1676 | HandleScope scope; |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1677 | // gcc-4.4 has problem generating correct code of following snippet: |
| 1678 | // { CEntryStub stub; |
| 1679 | // c_entry_code_ = *stub.GetCode(); |
| 1680 | // } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1681 | // { DebuggerStatementStub stub; |
| 1682 | // debugger_statement_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1683 | // } |
| 1684 | // To workaround the problem, make separate functions without inlining. |
| 1685 | Heap::CreateCEntryStub(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1686 | Heap::CreateJSEntryStub(); |
| 1687 | Heap::CreateJSConstructEntryStub(); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1688 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1689 | Heap::CreateRegExpCEntryStub(); |
| 1690 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1691 | } |
| 1692 | |
| 1693 | |
| 1694 | bool Heap::CreateInitialObjects() { |
| 1695 | Object* obj; |
| 1696 | |
| 1697 | // The -0 value must be set before NumberFromDouble works. |
| 1698 | obj = AllocateHeapNumber(-0.0, TENURED); |
| 1699 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1700 | set_minus_zero_value(obj); |
| 1701 | ASSERT(signbit(minus_zero_value()->Number()) != 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1702 | |
| 1703 | obj = AllocateHeapNumber(OS::nan_value(), TENURED); |
| 1704 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1705 | set_nan_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1706 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1707 | obj = Allocate(oddball_map(), OLD_DATA_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1708 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1709 | set_undefined_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1710 | ASSERT(!InNewSpace(undefined_value())); |
| 1711 | |
| 1712 | // Allocate initial symbol table. |
| 1713 | obj = SymbolTable::Allocate(kInitialSymbolTableSize); |
| 1714 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1715 | // Don't use set_symbol_table() due to asserts. |
| 1716 | roots_[kSymbolTableRootIndex] = obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1717 | |
| 1718 | // Assign the print strings for oddballs after creating symboltable. |
| 1719 | Object* symbol = LookupAsciiSymbol("undefined"); |
| 1720 | if (symbol->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1721 | Oddball::cast(undefined_value())->set_to_string(String::cast(symbol)); |
| 1722 | Oddball::cast(undefined_value())->set_to_number(nan_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1723 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1724 | // Allocate the null_value |
| 1725 | obj = Oddball::cast(null_value())->Initialize("null", Smi::FromInt(0)); |
| 1726 | if (obj->IsFailure()) return false; |
| 1727 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1728 | obj = CreateOddball("true", Smi::FromInt(1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1729 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1730 | set_true_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1731 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1732 | obj = CreateOddball("false", Smi::FromInt(0)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1733 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1734 | set_false_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1735 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1736 | obj = CreateOddball("hole", Smi::FromInt(-1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1737 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1738 | set_the_hole_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1739 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1740 | obj = CreateOddball("no_interceptor_result_sentinel", Smi::FromInt(-2)); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1741 | if (obj->IsFailure()) return false; |
| 1742 | set_no_interceptor_result_sentinel(obj); |
| 1743 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1744 | obj = CreateOddball("termination_exception", Smi::FromInt(-3)); |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 1745 | if (obj->IsFailure()) return false; |
| 1746 | set_termination_exception(obj); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1747 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1748 | // Allocate the empty string. |
| 1749 | obj = AllocateRawAsciiString(0, TENURED); |
| 1750 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1751 | set_empty_string(String::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1752 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1753 | for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) { |
| 1754 | obj = LookupAsciiSymbol(constant_symbol_table[i].contents); |
| 1755 | if (obj->IsFailure()) return false; |
| 1756 | roots_[constant_symbol_table[i].index] = String::cast(obj); |
| 1757 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1758 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 1759 | // Allocate the hidden symbol which is used to identify the hidden properties |
| 1760 | // in JSObjects. The hash code has a special value so that it will not match |
| 1761 | // 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] | 1762 | // 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] | 1763 | // hash code in place. The hash code for the hidden_symbol is zero to ensure |
| 1764 | // that it will always be at the first entry in property descriptors. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1765 | obj = AllocateSymbol(CStrVector(""), 0, String::kZeroHash); |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 1766 | if (obj->IsFailure()) return false; |
| 1767 | hidden_symbol_ = String::cast(obj); |
| 1768 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1769 | // Allocate the proxy for __proto__. |
| 1770 | obj = AllocateProxy((Address) &Accessors::ObjectPrototype); |
| 1771 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1772 | set_prototype_accessors(Proxy::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1773 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1774 | // Allocate the code_stubs dictionary. The initial size is set to avoid |
| 1775 | // expanding the dictionary during bootstrapping. |
| 1776 | obj = NumberDictionary::Allocate(128); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1777 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1778 | set_code_stubs(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1779 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1780 | // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size |
| 1781 | // is set to avoid expanding the dictionary during bootstrapping. |
| 1782 | obj = NumberDictionary::Allocate(64); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1783 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1784 | set_non_monomorphic_cache(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1785 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 1786 | set_instanceof_cache_function(Smi::FromInt(0)); |
| 1787 | set_instanceof_cache_map(Smi::FromInt(0)); |
| 1788 | set_instanceof_cache_answer(Smi::FromInt(0)); |
| 1789 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1790 | CreateFixedStubs(); |
| 1791 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1792 | if (InitializeNumberStringCache()->IsFailure()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1793 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1794 | // Allocate cache for single character ASCII strings. |
| 1795 | obj = AllocateFixedArray(String::kMaxAsciiCharCode + 1, TENURED); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1796 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1797 | set_single_character_string_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1798 | |
| 1799 | // Allocate cache for external strings pointing to native source code. |
| 1800 | obj = AllocateFixedArray(Natives::GetBuiltinsCount()); |
| 1801 | if (obj->IsFailure()) return false; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1802 | set_natives_source_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1803 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 1804 | // Handling of script id generation is in Factory::NewScript. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1805 | set_last_script_id(undefined_value()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 1806 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1807 | // Initialize keyed lookup cache. |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1808 | KeyedLookupCache::Clear(); |
| 1809 | |
| 1810 | // Initialize context slot cache. |
| 1811 | ContextSlotCache::Clear(); |
| 1812 | |
| 1813 | // Initialize descriptor cache. |
| 1814 | DescriptorLookupCache::Clear(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1815 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 1816 | // Initialize compilation cache. |
| 1817 | CompilationCache::Clear(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1818 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1819 | return true; |
| 1820 | } |
| 1821 | |
| 1822 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1823 | Object* Heap::InitializeNumberStringCache() { |
| 1824 | // Compute the size of the number string cache based on the max heap size. |
| 1825 | // max_semispace_size_ == 512 KB => number_string_cache_size = 32. |
| 1826 | // max_semispace_size_ == 8 MB => number_string_cache_size = 16KB. |
| 1827 | int number_string_cache_size = max_semispace_size_ / 512; |
| 1828 | number_string_cache_size = Max(32, Min(16*KB, number_string_cache_size)); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1829 | Object* obj = AllocateFixedArray(number_string_cache_size * 2, TENURED); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1830 | if (!obj->IsFailure()) set_number_string_cache(FixedArray::cast(obj)); |
| 1831 | return obj; |
| 1832 | } |
| 1833 | |
| 1834 | |
| 1835 | void Heap::FlushNumberStringCache() { |
| 1836 | // Flush the number to string cache. |
| 1837 | int len = number_string_cache()->length(); |
| 1838 | for (int i = 0; i < len; i++) { |
| 1839 | number_string_cache()->set_undefined(i); |
| 1840 | } |
| 1841 | } |
| 1842 | |
| 1843 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1844 | static inline int double_get_hash(double d) { |
| 1845 | DoubleRepresentation rep(d); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1846 | 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] | 1847 | } |
| 1848 | |
| 1849 | |
| 1850 | static inline int smi_get_hash(Smi* smi) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1851 | return smi->value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1852 | } |
| 1853 | |
| 1854 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1855 | Object* Heap::GetNumberStringCache(Object* number) { |
| 1856 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1857 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1858 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1859 | hash = smi_get_hash(Smi::cast(number)) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1860 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1861 | hash = double_get_hash(number->Number()) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1862 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1863 | Object* key = number_string_cache()->get(hash * 2); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1864 | if (key == number) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1865 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1866 | } else if (key->IsHeapNumber() && |
| 1867 | number->IsHeapNumber() && |
| 1868 | key->Number() == number->Number()) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1869 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1870 | } |
| 1871 | return undefined_value(); |
| 1872 | } |
| 1873 | |
| 1874 | |
| 1875 | void Heap::SetNumberStringCache(Object* number, String* string) { |
| 1876 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1877 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1878 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1879 | hash = smi_get_hash(Smi::cast(number)) & mask; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1880 | number_string_cache()->set(hash * 2, Smi::cast(number)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1881 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1882 | hash = double_get_hash(number->Number()) & mask; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1883 | number_string_cache()->set(hash * 2, number); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1884 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1885 | number_string_cache()->set(hash * 2 + 1, string); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1886 | } |
| 1887 | |
| 1888 | |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 1889 | Object* Heap::NumberToString(Object* number, bool check_number_string_cache) { |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 1890 | Counters::number_to_string_runtime.Increment(); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 1891 | if (check_number_string_cache) { |
| 1892 | Object* cached = GetNumberStringCache(number); |
| 1893 | if (cached != undefined_value()) { |
| 1894 | return cached; |
| 1895 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1896 | } |
| 1897 | |
| 1898 | char arr[100]; |
| 1899 | Vector<char> buffer(arr, ARRAY_SIZE(arr)); |
| 1900 | const char* str; |
| 1901 | if (number->IsSmi()) { |
| 1902 | int num = Smi::cast(number)->value(); |
| 1903 | str = IntToCString(num, buffer); |
| 1904 | } else { |
| 1905 | double num = HeapNumber::cast(number)->value(); |
| 1906 | str = DoubleToCString(num, buffer); |
| 1907 | } |
| 1908 | Object* result = AllocateStringFromAscii(CStrVector(str)); |
| 1909 | |
| 1910 | if (!result->IsFailure()) { |
| 1911 | SetNumberStringCache(number, String::cast(result)); |
| 1912 | } |
| 1913 | return result; |
| 1914 | } |
| 1915 | |
| 1916 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1917 | Map* Heap::MapForExternalArrayType(ExternalArrayType array_type) { |
| 1918 | return Map::cast(roots_[RootIndexForExternalArrayType(array_type)]); |
| 1919 | } |
| 1920 | |
| 1921 | |
| 1922 | Heap::RootListIndex Heap::RootIndexForExternalArrayType( |
| 1923 | ExternalArrayType array_type) { |
| 1924 | switch (array_type) { |
| 1925 | case kExternalByteArray: |
| 1926 | return kExternalByteArrayMapRootIndex; |
| 1927 | case kExternalUnsignedByteArray: |
| 1928 | return kExternalUnsignedByteArrayMapRootIndex; |
| 1929 | case kExternalShortArray: |
| 1930 | return kExternalShortArrayMapRootIndex; |
| 1931 | case kExternalUnsignedShortArray: |
| 1932 | return kExternalUnsignedShortArrayMapRootIndex; |
| 1933 | case kExternalIntArray: |
| 1934 | return kExternalIntArrayMapRootIndex; |
| 1935 | case kExternalUnsignedIntArray: |
| 1936 | return kExternalUnsignedIntArrayMapRootIndex; |
| 1937 | case kExternalFloatArray: |
| 1938 | return kExternalFloatArrayMapRootIndex; |
| 1939 | default: |
| 1940 | UNREACHABLE(); |
| 1941 | return kUndefinedValueRootIndex; |
| 1942 | } |
| 1943 | } |
| 1944 | |
| 1945 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1946 | Object* Heap::NumberFromDouble(double value, PretenureFlag pretenure) { |
kmillikin@chromium.org | 4111b80 | 2010-05-03 10:34:42 +0000 | [diff] [blame] | 1947 | // We need to distinguish the minus zero value and this cannot be |
| 1948 | // done after conversion to int. Doing this by comparing bit |
| 1949 | // patterns is faster than using fpclassify() et al. |
| 1950 | static const DoubleRepresentation minus_zero(-0.0); |
| 1951 | |
| 1952 | DoubleRepresentation rep(value); |
| 1953 | if (rep.bits == minus_zero.bits) { |
| 1954 | return AllocateHeapNumber(-0.0, pretenure); |
| 1955 | } |
| 1956 | |
| 1957 | int int_value = FastD2I(value); |
| 1958 | if (value == int_value && Smi::IsValid(int_value)) { |
| 1959 | return Smi::FromInt(int_value); |
| 1960 | } |
| 1961 | |
| 1962 | // Materialize the value in the heap. |
| 1963 | return AllocateHeapNumber(value, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1964 | } |
| 1965 | |
| 1966 | |
| 1967 | Object* Heap::AllocateProxy(Address proxy, PretenureFlag pretenure) { |
| 1968 | // Statically ensure that it is safe to allocate proxies in paged spaces. |
| 1969 | STATIC_ASSERT(Proxy::kSize <= Page::kMaxHeapObjectSize); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1970 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1971 | Object* result = Allocate(proxy_map(), space); |
| 1972 | if (result->IsFailure()) return result; |
| 1973 | |
| 1974 | Proxy::cast(result)->set_proxy(proxy); |
| 1975 | return result; |
| 1976 | } |
| 1977 | |
| 1978 | |
| 1979 | Object* Heap::AllocateSharedFunctionInfo(Object* name) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1980 | Object* result = Allocate(shared_function_info_map(), OLD_POINTER_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1981 | if (result->IsFailure()) return result; |
| 1982 | |
| 1983 | SharedFunctionInfo* share = SharedFunctionInfo::cast(result); |
| 1984 | share->set_name(name); |
| 1985 | Code* illegal = Builtins::builtin(Builtins::Illegal); |
| 1986 | share->set_code(illegal); |
ager@chromium.org | b573749 | 2010-07-15 09:29:43 +0000 | [diff] [blame] | 1987 | share->set_scope_info(SerializedScopeInfo::Empty()); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1988 | Code* construct_stub = Builtins::builtin(Builtins::JSConstructStubGeneric); |
| 1989 | share->set_construct_stub(construct_stub); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1990 | share->set_expected_nof_properties(0); |
| 1991 | share->set_length(0); |
| 1992 | share->set_formal_parameter_count(0); |
| 1993 | share->set_instance_class_name(Object_symbol()); |
| 1994 | share->set_function_data(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1995 | share->set_script(undefined_value()); |
| 1996 | share->set_start_position_and_type(0); |
| 1997 | share->set_debug_info(undefined_value()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 1998 | share->set_inferred_name(empty_string()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1999 | share->set_compiler_hints(0); |
| 2000 | share->set_this_property_assignments_count(0); |
| 2001 | share->set_this_property_assignments(undefined_value()); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2002 | share->set_num_literals(0); |
| 2003 | share->set_end_position(0); |
| 2004 | share->set_function_token_position(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2005 | return result; |
| 2006 | } |
| 2007 | |
| 2008 | |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2009 | // Returns true for a character in a range. Both limits are inclusive. |
| 2010 | static inline bool Between(uint32_t character, uint32_t from, uint32_t to) { |
| 2011 | // This makes uses of the the unsigned wraparound. |
| 2012 | return character - from <= to - from; |
| 2013 | } |
| 2014 | |
| 2015 | |
| 2016 | static inline Object* MakeOrFindTwoCharacterString(uint32_t c1, uint32_t c2) { |
| 2017 | String* symbol; |
| 2018 | // Numeric strings have a different hash algorithm not known by |
| 2019 | // LookupTwoCharsSymbolIfExists, so we skip this step for such strings. |
| 2020 | if ((!Between(c1, '0', '9') || !Between(c2, '0', '9')) && |
| 2021 | Heap::symbol_table()->LookupTwoCharsSymbolIfExists(c1, c2, &symbol)) { |
| 2022 | return symbol; |
| 2023 | // Now we know the length is 2, we might as well make use of that fact |
| 2024 | // when building the new string. |
| 2025 | } else if ((c1 | c2) <= String::kMaxAsciiCharCodeU) { // We can do this |
| 2026 | ASSERT(IsPowerOf2(String::kMaxAsciiCharCodeU + 1)); // because of this. |
| 2027 | Object* result = Heap::AllocateRawAsciiString(2); |
| 2028 | if (result->IsFailure()) return result; |
| 2029 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2030 | dest[0] = c1; |
| 2031 | dest[1] = c2; |
| 2032 | return result; |
| 2033 | } else { |
| 2034 | Object* result = Heap::AllocateRawTwoByteString(2); |
| 2035 | if (result->IsFailure()) return result; |
| 2036 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
| 2037 | dest[0] = c1; |
| 2038 | dest[1] = c2; |
| 2039 | return result; |
| 2040 | } |
| 2041 | } |
| 2042 | |
| 2043 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2044 | Object* Heap::AllocateConsString(String* first, String* second) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2045 | int first_length = first->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2046 | if (first_length == 0) { |
| 2047 | return second; |
| 2048 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2049 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2050 | int second_length = second->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2051 | if (second_length == 0) { |
| 2052 | return first; |
| 2053 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2054 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2055 | int length = first_length + second_length; |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2056 | |
| 2057 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2058 | // dictionary. Check whether we already have the string in the symbol |
| 2059 | // table to prevent creation of many unneccesary strings. |
| 2060 | if (length == 2) { |
| 2061 | unsigned c1 = first->Get(0); |
| 2062 | unsigned c2 = second->Get(0); |
| 2063 | return MakeOrFindTwoCharacterString(c1, c2); |
| 2064 | } |
| 2065 | |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2066 | bool first_is_ascii = first->IsAsciiRepresentation(); |
| 2067 | bool second_is_ascii = second->IsAsciiRepresentation(); |
| 2068 | bool is_ascii = first_is_ascii && second_is_ascii; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2069 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2070 | // 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] | 2071 | // of the new cons string is too large. |
| 2072 | if (length > String::kMaxLength || length < 0) { |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2073 | Top::context()->mark_out_of_memory(); |
| 2074 | return Failure::OutOfMemoryException(); |
| 2075 | } |
| 2076 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2077 | bool is_ascii_data_in_two_byte_string = false; |
| 2078 | if (!is_ascii) { |
| 2079 | // At least one of the strings uses two-byte representation so we |
| 2080 | // can't use the fast case code for short ascii strings below, but |
| 2081 | // we can try to save memory if all chars actually fit in ascii. |
| 2082 | is_ascii_data_in_two_byte_string = |
| 2083 | first->HasOnlyAsciiChars() && second->HasOnlyAsciiChars(); |
| 2084 | if (is_ascii_data_in_two_byte_string) { |
| 2085 | Counters::string_add_runtime_ext_to_ascii.Increment(); |
| 2086 | } |
| 2087 | } |
| 2088 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2089 | // If the resulting string is small make a flat string. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2090 | if (length < String::kMinNonFlatLength) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2091 | ASSERT(first->IsFlat()); |
| 2092 | ASSERT(second->IsFlat()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2093 | if (is_ascii) { |
| 2094 | Object* result = AllocateRawAsciiString(length); |
| 2095 | if (result->IsFailure()) return result; |
| 2096 | // Copy the characters into the new object. |
| 2097 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2098 | // Copy first part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2099 | const char* src; |
| 2100 | if (first->IsExternalString()) { |
| 2101 | src = ExternalAsciiString::cast(first)->resource()->data(); |
| 2102 | } else { |
| 2103 | src = SeqAsciiString::cast(first)->GetChars(); |
| 2104 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2105 | for (int i = 0; i < first_length; i++) *dest++ = src[i]; |
| 2106 | // Copy second part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2107 | if (second->IsExternalString()) { |
| 2108 | src = ExternalAsciiString::cast(second)->resource()->data(); |
| 2109 | } else { |
| 2110 | src = SeqAsciiString::cast(second)->GetChars(); |
| 2111 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2112 | for (int i = 0; i < second_length; i++) *dest++ = src[i]; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2113 | return result; |
| 2114 | } else { |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2115 | if (is_ascii_data_in_two_byte_string) { |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2116 | Object* result = AllocateRawAsciiString(length); |
| 2117 | if (result->IsFailure()) return result; |
| 2118 | // Copy the characters into the new object. |
| 2119 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2120 | String::WriteToFlat(first, dest, 0, first_length); |
| 2121 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2122 | return result; |
| 2123 | } |
| 2124 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2125 | Object* result = AllocateRawTwoByteString(length); |
| 2126 | if (result->IsFailure()) return result; |
| 2127 | // Copy the characters into the new object. |
| 2128 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2129 | String::WriteToFlat(first, dest, 0, first_length); |
| 2130 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2131 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2132 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2133 | } |
| 2134 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2135 | Map* map = (is_ascii || is_ascii_data_in_two_byte_string) ? |
| 2136 | cons_ascii_string_map() : cons_string_map(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2137 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2138 | Object* result = Allocate(map, NEW_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2139 | if (result->IsFailure()) return result; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2140 | |
| 2141 | AssertNoAllocation no_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2142 | ConsString* cons_string = ConsString::cast(result); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2143 | WriteBarrierMode mode = cons_string->GetWriteBarrierMode(no_gc); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2144 | cons_string->set_length(length); |
| 2145 | cons_string->set_hash_field(String::kEmptyHashField); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2146 | cons_string->set_first(first, mode); |
| 2147 | cons_string->set_second(second, mode); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2148 | return result; |
| 2149 | } |
| 2150 | |
| 2151 | |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2152 | Object* Heap::AllocateSubString(String* buffer, |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2153 | int start, |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 2154 | int end, |
| 2155 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2156 | int length = end - start; |
| 2157 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2158 | if (length == 1) { |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2159 | return Heap::LookupSingleCharacterStringFromCode( |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2160 | buffer->Get(start)); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2161 | } else if (length == 2) { |
| 2162 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2163 | // dictionary. Check whether we already have the string in the symbol |
| 2164 | // table to prevent creation of many unneccesary strings. |
| 2165 | unsigned c1 = buffer->Get(start); |
| 2166 | unsigned c2 = buffer->Get(start + 1); |
| 2167 | return MakeOrFindTwoCharacterString(c1, c2); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2168 | } |
| 2169 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2170 | // 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] | 2171 | buffer = buffer->TryFlattenGetString(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2172 | |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 2173 | Object* result = buffer->IsAsciiRepresentation() |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 2174 | ? AllocateRawAsciiString(length, pretenure ) |
| 2175 | : AllocateRawTwoByteString(length, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2176 | if (result->IsFailure()) return result; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2177 | String* string_result = String::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2178 | // Copy the characters into the new object. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2179 | if (buffer->IsAsciiRepresentation()) { |
| 2180 | ASSERT(string_result->IsAsciiRepresentation()); |
| 2181 | char* dest = SeqAsciiString::cast(string_result)->GetChars(); |
| 2182 | String::WriteToFlat(buffer, dest, start, end); |
| 2183 | } else { |
| 2184 | ASSERT(string_result->IsTwoByteRepresentation()); |
| 2185 | uc16* dest = SeqTwoByteString::cast(string_result)->GetChars(); |
| 2186 | String::WriteToFlat(buffer, dest, start, end); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2187 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2188 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2189 | return result; |
| 2190 | } |
| 2191 | |
| 2192 | |
| 2193 | Object* Heap::AllocateExternalStringFromAscii( |
| 2194 | ExternalAsciiString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2195 | size_t length = resource->length(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2196 | if (length > static_cast<size_t>(String::kMaxLength)) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2197 | Top::context()->mark_out_of_memory(); |
| 2198 | return Failure::OutOfMemoryException(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2199 | } |
| 2200 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2201 | Map* map = external_ascii_string_map(); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2202 | Object* result = Allocate(map, NEW_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2203 | if (result->IsFailure()) return result; |
| 2204 | |
| 2205 | ExternalAsciiString* external_string = ExternalAsciiString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2206 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2207 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2208 | external_string->set_resource(resource); |
| 2209 | |
| 2210 | return result; |
| 2211 | } |
| 2212 | |
| 2213 | |
| 2214 | Object* Heap::AllocateExternalStringFromTwoByte( |
| 2215 | ExternalTwoByteString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2216 | size_t length = resource->length(); |
| 2217 | if (length > static_cast<size_t>(String::kMaxLength)) { |
| 2218 | Top::context()->mark_out_of_memory(); |
| 2219 | return Failure::OutOfMemoryException(); |
| 2220 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2221 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2222 | // For small strings we check whether the resource contains only |
| 2223 | // ascii characters. If yes, we use a different string map. |
| 2224 | bool is_ascii = true; |
| 2225 | if (length >= static_cast<size_t>(String::kMinNonFlatLength)) { |
| 2226 | is_ascii = false; |
| 2227 | } else { |
| 2228 | const uc16* data = resource->data(); |
| 2229 | for (size_t i = 0; i < length; i++) { |
| 2230 | if (data[i] > String::kMaxAsciiCharCode) { |
| 2231 | is_ascii = false; |
| 2232 | break; |
| 2233 | } |
| 2234 | } |
| 2235 | } |
| 2236 | |
| 2237 | Map* map = is_ascii ? |
| 2238 | Heap::external_string_with_ascii_data_map() : Heap::external_string_map(); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2239 | Object* result = Allocate(map, NEW_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2240 | if (result->IsFailure()) return result; |
| 2241 | |
| 2242 | ExternalTwoByteString* external_string = ExternalTwoByteString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2243 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2244 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2245 | external_string->set_resource(resource); |
| 2246 | |
| 2247 | return result; |
| 2248 | } |
| 2249 | |
| 2250 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2251 | Object* Heap::LookupSingleCharacterStringFromCode(uint16_t code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2252 | if (code <= String::kMaxAsciiCharCode) { |
| 2253 | Object* value = Heap::single_character_string_cache()->get(code); |
| 2254 | if (value != Heap::undefined_value()) return value; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2255 | |
| 2256 | char buffer[1]; |
| 2257 | buffer[0] = static_cast<char>(code); |
| 2258 | Object* result = LookupSymbol(Vector<const char>(buffer, 1)); |
| 2259 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2260 | if (result->IsFailure()) return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2261 | Heap::single_character_string_cache()->set(code, result); |
| 2262 | return result; |
| 2263 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2264 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2265 | Object* result = Heap::AllocateRawTwoByteString(1); |
| 2266 | if (result->IsFailure()) return result; |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2267 | String* answer = String::cast(result); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2268 | answer->Set(0, code); |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2269 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2270 | } |
| 2271 | |
| 2272 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2273 | Object* Heap::AllocateByteArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2274 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 2275 | return Failure::OutOfMemoryException(); |
| 2276 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2277 | if (pretenure == NOT_TENURED) { |
| 2278 | return AllocateByteArray(length); |
| 2279 | } |
| 2280 | int size = ByteArray::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2281 | Object* result = (size <= MaxObjectSizeInPagedSpace()) |
| 2282 | ? old_data_space_->AllocateRaw(size) |
| 2283 | : lo_space_->AllocateRaw(size); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2284 | if (result->IsFailure()) return result; |
| 2285 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2286 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 2287 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2288 | return result; |
| 2289 | } |
| 2290 | |
| 2291 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2292 | Object* Heap::AllocateByteArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2293 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 2294 | return Failure::OutOfMemoryException(); |
| 2295 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2296 | int size = ByteArray::SizeFor(length); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2297 | AllocationSpace space = |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2298 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : NEW_SPACE; |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2299 | Object* result = AllocateRaw(size, space, OLD_DATA_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2300 | if (result->IsFailure()) return result; |
| 2301 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2302 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 2303 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2304 | return result; |
| 2305 | } |
| 2306 | |
| 2307 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2308 | void Heap::CreateFillerObjectAt(Address addr, int size) { |
| 2309 | if (size == 0) return; |
| 2310 | HeapObject* filler = HeapObject::FromAddress(addr); |
| 2311 | if (size == kPointerSize) { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2312 | filler->set_map(one_pointer_filler_map()); |
| 2313 | } else if (size == 2 * kPointerSize) { |
| 2314 | filler->set_map(two_pointer_filler_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2315 | } else { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2316 | filler->set_map(byte_array_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2317 | ByteArray::cast(filler)->set_length(ByteArray::LengthFor(size)); |
| 2318 | } |
| 2319 | } |
| 2320 | |
| 2321 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2322 | Object* Heap::AllocatePixelArray(int length, |
| 2323 | uint8_t* external_pointer, |
| 2324 | PretenureFlag pretenure) { |
| 2325 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2326 | Object* result = AllocateRaw(PixelArray::kAlignedSize, space, OLD_DATA_SPACE); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2327 | if (result->IsFailure()) return result; |
| 2328 | |
| 2329 | reinterpret_cast<PixelArray*>(result)->set_map(pixel_array_map()); |
| 2330 | reinterpret_cast<PixelArray*>(result)->set_length(length); |
| 2331 | reinterpret_cast<PixelArray*>(result)->set_external_pointer(external_pointer); |
| 2332 | |
| 2333 | return result; |
| 2334 | } |
| 2335 | |
| 2336 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2337 | Object* Heap::AllocateExternalArray(int length, |
| 2338 | ExternalArrayType array_type, |
| 2339 | void* external_pointer, |
| 2340 | PretenureFlag pretenure) { |
| 2341 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2342 | Object* result = AllocateRaw(ExternalArray::kAlignedSize, |
| 2343 | space, |
| 2344 | OLD_DATA_SPACE); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2345 | if (result->IsFailure()) return result; |
| 2346 | |
| 2347 | reinterpret_cast<ExternalArray*>(result)->set_map( |
| 2348 | MapForExternalArrayType(array_type)); |
| 2349 | reinterpret_cast<ExternalArray*>(result)->set_length(length); |
| 2350 | reinterpret_cast<ExternalArray*>(result)->set_external_pointer( |
| 2351 | external_pointer); |
| 2352 | |
| 2353 | return result; |
| 2354 | } |
| 2355 | |
| 2356 | |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2357 | // The StackVisitor is used to traverse all the archived threads to see if |
| 2358 | // there are activations on any of the stacks corresponding to the code. |
| 2359 | class FlushingStackVisitor : public ThreadVisitor { |
| 2360 | public: |
| 2361 | explicit FlushingStackVisitor(Code* code) : found_(false), code_(code) {} |
| 2362 | |
| 2363 | void VisitThread(ThreadLocalTop* top) { |
| 2364 | // If we already found the code in a previous traversed thread we return. |
| 2365 | if (found_) return; |
| 2366 | |
| 2367 | for (StackFrameIterator it(top); !it.done(); it.Advance()) { |
| 2368 | if (code_->contains(it.frame()->pc())) { |
| 2369 | found_ = true; |
| 2370 | return; |
| 2371 | } |
| 2372 | } |
| 2373 | } |
| 2374 | bool FoundCode() {return found_;} |
| 2375 | |
| 2376 | private: |
| 2377 | bool found_; |
| 2378 | Code* code_; |
| 2379 | }; |
| 2380 | |
| 2381 | |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2382 | static bool CodeIsActive(Code* code) { |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2383 | // Make sure we are not referencing the code from the stack. |
| 2384 | for (StackFrameIterator it; !it.done(); it.Advance()) { |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2385 | if (code->contains(it.frame()->pc())) return true; |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2386 | } |
| 2387 | // Iterate the archived stacks in all threads to check if |
| 2388 | // the code is referenced. |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2389 | FlushingStackVisitor threadvisitor(code); |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2390 | ThreadManager::IterateArchivedThreads(&threadvisitor); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2391 | if (threadvisitor.FoundCode()) return true; |
| 2392 | return false; |
| 2393 | } |
| 2394 | |
| 2395 | |
| 2396 | static void FlushCodeForFunction(JSFunction* function) { |
| 2397 | SharedFunctionInfo* shared_info = function->shared(); |
| 2398 | |
| 2399 | // Special handling if the function and shared info objects |
| 2400 | // have different code objects. |
| 2401 | if (function->code() != shared_info->code()) { |
| 2402 | // If the shared function has been flushed but the function has not, |
| 2403 | // we flush the function if possible. |
| 2404 | if (!shared_info->is_compiled() && function->is_compiled() && |
| 2405 | !CodeIsActive(function->code())) { |
| 2406 | function->set_code(shared_info->code()); |
| 2407 | } |
| 2408 | return; |
| 2409 | } |
| 2410 | |
| 2411 | // The function must be compiled and have the source code available, |
| 2412 | // to be able to recompile it in case we need the function again. |
| 2413 | if (!(shared_info->is_compiled() && shared_info->HasSourceCode())) return; |
| 2414 | |
| 2415 | // We never flush code for Api functions. |
| 2416 | if (shared_info->IsApiFunction()) return; |
| 2417 | |
| 2418 | // Only flush code for functions. |
| 2419 | if (!shared_info->code()->kind() == Code::FUNCTION) return; |
| 2420 | |
| 2421 | // Function must be lazy compilable. |
| 2422 | if (!shared_info->allows_lazy_compilation()) return; |
| 2423 | |
| 2424 | // If this is a full script wrapped in a function we do no flush the code. |
| 2425 | if (shared_info->is_toplevel()) return; |
| 2426 | |
| 2427 | // If this function is in the compilation cache we do not flush the code. |
| 2428 | if (CompilationCache::HasFunction(shared_info)) return; |
| 2429 | |
| 2430 | // Check stack and archived threads for the code. |
| 2431 | if (CodeIsActive(shared_info->code())) return; |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2432 | |
ager@chromium.org | b573749 | 2010-07-15 09:29:43 +0000 | [diff] [blame] | 2433 | // Compute the lazy compilable version of the code. |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 2434 | Code* code = Builtins::builtin(Builtins::LazyCompile); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2435 | shared_info->set_code(code); |
| 2436 | function->set_code(code); |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2437 | } |
| 2438 | |
| 2439 | |
| 2440 | void Heap::FlushCode() { |
| 2441 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 2442 | // Do not flush code if the debugger is loaded or there are breakpoints. |
| 2443 | if (Debug::IsLoaded() || Debug::has_break_points()) return; |
| 2444 | #endif |
| 2445 | HeapObjectIterator it(old_pointer_space()); |
| 2446 | for (HeapObject* obj = it.next(); obj != NULL; obj = it.next()) { |
| 2447 | if (obj->IsJSFunction()) { |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2448 | JSFunction* function = JSFunction::cast(obj); |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2449 | |
| 2450 | // The function must have a valid context and not be a builtin. |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2451 | if (function->unchecked_context()->IsContext() && |
| 2452 | !function->IsBuiltin()) { |
| 2453 | FlushCodeForFunction(function); |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2454 | } |
| 2455 | } |
| 2456 | } |
| 2457 | } |
| 2458 | |
| 2459 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2460 | Object* Heap::CreateCode(const CodeDesc& desc, |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2461 | Code::Flags flags, |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 2462 | Handle<Object> self_reference) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2463 | // Allocate ByteArray before the Code object, so that we do not risk |
| 2464 | // leaving uninitialized Code object (and breaking the heap). |
| 2465 | Object* reloc_info = AllocateByteArray(desc.reloc_size, TENURED); |
| 2466 | if (reloc_info->IsFailure()) return reloc_info; |
| 2467 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2468 | // Compute size |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2469 | int body_size = RoundUp(desc.instr_size, kObjectAlignment); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 2470 | int obj_size = Code::SizeFor(body_size); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 2471 | ASSERT(IsAligned(obj_size, Code::kCodeAlignment)); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2472 | Object* result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2473 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2474 | result = lo_space_->AllocateRawCode(obj_size); |
| 2475 | } else { |
| 2476 | result = code_space_->AllocateRaw(obj_size); |
| 2477 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2478 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2479 | if (result->IsFailure()) return result; |
| 2480 | |
| 2481 | // Initialize the object |
| 2482 | HeapObject::cast(result)->set_map(code_map()); |
| 2483 | Code* code = Code::cast(result); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2484 | ASSERT(!CodeRange::exists() || CodeRange::contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2485 | code->set_instruction_size(desc.instr_size); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2486 | code->set_relocation_info(ByteArray::cast(reloc_info)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2487 | code->set_flags(flags); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 2488 | // Allow self references to created code object by patching the handle to |
| 2489 | // point to the newly allocated Code object. |
| 2490 | if (!self_reference.is_null()) { |
| 2491 | *(self_reference.location()) = code; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2492 | } |
| 2493 | // Migrate generated code. |
| 2494 | // The generated code can contain Object** values (typically from handles) |
| 2495 | // that are dereferenced during the copy to point directly to the actual heap |
| 2496 | // objects. These pointers can include references to the code object itself, |
| 2497 | // through the self_reference parameter. |
| 2498 | code->CopyFrom(desc); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2499 | |
| 2500 | #ifdef DEBUG |
| 2501 | code->Verify(); |
| 2502 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2503 | return code; |
| 2504 | } |
| 2505 | |
| 2506 | |
| 2507 | Object* Heap::CopyCode(Code* code) { |
| 2508 | // Allocate an object the same size as the code object. |
| 2509 | int obj_size = code->Size(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2510 | Object* result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2511 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2512 | result = lo_space_->AllocateRawCode(obj_size); |
| 2513 | } else { |
| 2514 | result = code_space_->AllocateRaw(obj_size); |
| 2515 | } |
| 2516 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2517 | if (result->IsFailure()) return result; |
| 2518 | |
| 2519 | // Copy code object. |
| 2520 | Address old_addr = code->address(); |
| 2521 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2522 | CopyBlock(new_addr, old_addr, obj_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2523 | // Relocate the copy. |
| 2524 | Code* new_code = Code::cast(result); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2525 | ASSERT(!CodeRange::exists() || CodeRange::contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2526 | new_code->Relocate(new_addr - old_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2527 | return new_code; |
| 2528 | } |
| 2529 | |
| 2530 | |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2531 | Object* Heap::CopyCode(Code* code, Vector<byte> reloc_info) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2532 | // Allocate ByteArray before the Code object, so that we do not risk |
| 2533 | // leaving uninitialized Code object (and breaking the heap). |
| 2534 | Object* reloc_info_array = AllocateByteArray(reloc_info.length(), TENURED); |
| 2535 | if (reloc_info_array->IsFailure()) return reloc_info_array; |
| 2536 | |
| 2537 | int new_body_size = RoundUp(code->instruction_size(), kObjectAlignment); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2538 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 2539 | int new_obj_size = Code::SizeFor(new_body_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2540 | |
| 2541 | Address old_addr = code->address(); |
| 2542 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2543 | size_t relocation_offset = |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2544 | static_cast<size_t>(code->instruction_end() - old_addr); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2545 | |
| 2546 | Object* result; |
| 2547 | if (new_obj_size > MaxObjectSizeInPagedSpace()) { |
| 2548 | result = lo_space_->AllocateRawCode(new_obj_size); |
| 2549 | } else { |
| 2550 | result = code_space_->AllocateRaw(new_obj_size); |
| 2551 | } |
| 2552 | |
| 2553 | if (result->IsFailure()) return result; |
| 2554 | |
| 2555 | // Copy code object. |
| 2556 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
| 2557 | |
| 2558 | // Copy header and instructions. |
| 2559 | memcpy(new_addr, old_addr, relocation_offset); |
| 2560 | |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2561 | Code* new_code = Code::cast(result); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2562 | new_code->set_relocation_info(ByteArray::cast(reloc_info_array)); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2563 | |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2564 | // Copy patched rinfo. |
| 2565 | memcpy(new_code->relocation_start(), reloc_info.start(), reloc_info.length()); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2566 | |
| 2567 | // Relocate the copy. |
| 2568 | ASSERT(!CodeRange::exists() || CodeRange::contains(code->address())); |
| 2569 | new_code->Relocate(new_addr - old_addr); |
| 2570 | |
| 2571 | #ifdef DEBUG |
| 2572 | code->Verify(); |
| 2573 | #endif |
| 2574 | return new_code; |
| 2575 | } |
| 2576 | |
| 2577 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2578 | Object* Heap::Allocate(Map* map, AllocationSpace space) { |
| 2579 | ASSERT(gc_state_ == NOT_IN_GC); |
| 2580 | ASSERT(map->instance_type() != MAP_TYPE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2581 | // If allocation failures are disallowed, we may allocate in a different |
| 2582 | // space when new space is full and the object is not a large object. |
| 2583 | AllocationSpace retry_space = |
| 2584 | (space != NEW_SPACE) ? space : TargetSpaceId(map->instance_type()); |
| 2585 | Object* result = |
| 2586 | AllocateRaw(map->instance_size(), space, retry_space); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2587 | if (result->IsFailure()) return result; |
| 2588 | HeapObject::cast(result)->set_map(map); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2589 | #ifdef ENABLE_LOGGING_AND_PROFILING |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 2590 | ProducerHeapProfile::RecordJSObjectAllocation(result); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2591 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2592 | return result; |
| 2593 | } |
| 2594 | |
| 2595 | |
| 2596 | Object* Heap::InitializeFunction(JSFunction* function, |
| 2597 | SharedFunctionInfo* shared, |
| 2598 | Object* prototype) { |
| 2599 | ASSERT(!prototype->IsMap()); |
| 2600 | function->initialize_properties(); |
| 2601 | function->initialize_elements(); |
| 2602 | function->set_shared(shared); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2603 | function->set_code(shared->code()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2604 | function->set_prototype_or_initial_map(prototype); |
| 2605 | function->set_context(undefined_value()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2606 | function->set_literals(empty_fixed_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2607 | return function; |
| 2608 | } |
| 2609 | |
| 2610 | |
| 2611 | Object* Heap::AllocateFunctionPrototype(JSFunction* function) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2612 | // Allocate the prototype. Make sure to use the object function |
| 2613 | // from the function's context, since the function can be from a |
| 2614 | // different context. |
| 2615 | JSFunction* object_function = |
| 2616 | function->context()->global_context()->object_function(); |
| 2617 | Object* prototype = AllocateJSObject(object_function); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2618 | if (prototype->IsFailure()) return prototype; |
| 2619 | // When creating the prototype for the function we must set its |
| 2620 | // constructor to the function. |
| 2621 | Object* result = |
| 2622 | JSObject::cast(prototype)->SetProperty(constructor_symbol(), |
| 2623 | function, |
| 2624 | DONT_ENUM); |
| 2625 | if (result->IsFailure()) return result; |
| 2626 | return prototype; |
| 2627 | } |
| 2628 | |
| 2629 | |
| 2630 | Object* Heap::AllocateFunction(Map* function_map, |
| 2631 | SharedFunctionInfo* shared, |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 2632 | Object* prototype, |
| 2633 | PretenureFlag pretenure) { |
| 2634 | AllocationSpace space = |
| 2635 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
| 2636 | Object* result = Allocate(function_map, space); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2637 | if (result->IsFailure()) return result; |
| 2638 | return InitializeFunction(JSFunction::cast(result), shared, prototype); |
| 2639 | } |
| 2640 | |
| 2641 | |
| 2642 | Object* Heap::AllocateArgumentsObject(Object* callee, int length) { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 2643 | // To get fast allocation and map sharing for arguments objects we |
| 2644 | // allocate them based on an arguments boilerplate. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2645 | |
| 2646 | // This calls Copy directly rather than using Heap::AllocateRaw so we |
| 2647 | // duplicate the check here. |
| 2648 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 2649 | |
| 2650 | JSObject* boilerplate = |
| 2651 | Top::context()->global_context()->arguments_boilerplate(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2652 | |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 2653 | // Check that the size of the boilerplate matches our |
| 2654 | // expectations. The ArgumentsAccessStub::GenerateNewObject relies |
| 2655 | // on the size being a known constant. |
| 2656 | ASSERT(kArgumentsObjectSize == boilerplate->map()->instance_size()); |
| 2657 | |
| 2658 | // Do the allocation. |
| 2659 | Object* result = |
| 2660 | AllocateRaw(kArgumentsObjectSize, NEW_SPACE, OLD_POINTER_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2661 | if (result->IsFailure()) return result; |
| 2662 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2663 | // Copy the content. The arguments boilerplate doesn't have any |
| 2664 | // fields that point to new space so it's safe to skip the write |
| 2665 | // barrier here. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2666 | CopyBlock(HeapObject::cast(result)->address(), |
| 2667 | boilerplate->address(), |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 2668 | kArgumentsObjectSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2669 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2670 | // Set the two properties. |
| 2671 | JSObject::cast(result)->InObjectPropertyAtPut(arguments_callee_index, |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2672 | callee); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2673 | JSObject::cast(result)->InObjectPropertyAtPut(arguments_length_index, |
| 2674 | Smi::FromInt(length), |
| 2675 | SKIP_WRITE_BARRIER); |
| 2676 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2677 | // Check the state of the object |
| 2678 | ASSERT(JSObject::cast(result)->HasFastProperties()); |
| 2679 | ASSERT(JSObject::cast(result)->HasFastElements()); |
| 2680 | |
| 2681 | return result; |
| 2682 | } |
| 2683 | |
| 2684 | |
| 2685 | Object* Heap::AllocateInitialMap(JSFunction* fun) { |
| 2686 | ASSERT(!fun->has_initial_map()); |
| 2687 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2688 | // First create a new map with the size and number of in-object properties |
| 2689 | // suggested by the function. |
| 2690 | int instance_size = fun->shared()->CalculateInstanceSize(); |
| 2691 | int in_object_properties = fun->shared()->CalculateInObjectProperties(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2692 | Object* map_obj = Heap::AllocateMap(JS_OBJECT_TYPE, instance_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2693 | if (map_obj->IsFailure()) return map_obj; |
| 2694 | |
| 2695 | // Fetch or allocate prototype. |
| 2696 | Object* prototype; |
| 2697 | if (fun->has_instance_prototype()) { |
| 2698 | prototype = fun->instance_prototype(); |
| 2699 | } else { |
| 2700 | prototype = AllocateFunctionPrototype(fun); |
| 2701 | if (prototype->IsFailure()) return prototype; |
| 2702 | } |
| 2703 | Map* map = Map::cast(map_obj); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2704 | map->set_inobject_properties(in_object_properties); |
| 2705 | map->set_unused_property_fields(in_object_properties); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2706 | map->set_prototype(prototype); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 2707 | ASSERT(map->has_fast_elements()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2708 | |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 2709 | // If the function has only simple this property assignments add |
| 2710 | // field descriptors for these to the initial map as the object |
| 2711 | // cannot be constructed without having these properties. Guard by |
| 2712 | // the inline_new flag so we only change the map if we generate a |
| 2713 | // specialized construct stub. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2714 | ASSERT(in_object_properties <= Map::kMaxPreAllocatedPropertyFields); |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 2715 | if (fun->shared()->CanGenerateInlineConstructor(prototype)) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2716 | int count = fun->shared()->this_property_assignments_count(); |
| 2717 | if (count > in_object_properties) { |
| 2718 | count = in_object_properties; |
| 2719 | } |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 2720 | Object* descriptors_obj = DescriptorArray::Allocate(count); |
| 2721 | if (descriptors_obj->IsFailure()) return descriptors_obj; |
| 2722 | DescriptorArray* descriptors = DescriptorArray::cast(descriptors_obj); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2723 | for (int i = 0; i < count; i++) { |
| 2724 | String* name = fun->shared()->GetThisPropertyAssignmentName(i); |
| 2725 | ASSERT(name->IsSymbol()); |
| 2726 | FieldDescriptor field(name, i, NONE); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2727 | field.SetEnumerationIndex(i); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2728 | descriptors->Set(i, &field); |
| 2729 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2730 | descriptors->SetNextEnumerationIndex(count); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2731 | descriptors->Sort(); |
| 2732 | map->set_instance_descriptors(descriptors); |
| 2733 | map->set_pre_allocated_property_fields(count); |
| 2734 | map->set_unused_property_fields(in_object_properties - count); |
| 2735 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2736 | return map; |
| 2737 | } |
| 2738 | |
| 2739 | |
| 2740 | void Heap::InitializeJSObjectFromMap(JSObject* obj, |
| 2741 | FixedArray* properties, |
| 2742 | Map* map) { |
| 2743 | obj->set_properties(properties); |
| 2744 | obj->initialize_elements(); |
| 2745 | // TODO(1240798): Initialize the object's body using valid initial values |
| 2746 | // according to the object's initial map. For example, if the map's |
| 2747 | // instance type is JS_ARRAY_TYPE, the length field should be initialized |
| 2748 | // to a number (eg, Smi::FromInt(0)) and the elements initialized to a |
| 2749 | // fixed array (eg, Heap::empty_fixed_array()). Currently, the object |
| 2750 | // verification code has to cope with (temporarily) invalid objects. See |
| 2751 | // for example, JSArray::JSArrayVerify). |
| 2752 | obj->InitializeBody(map->instance_size()); |
| 2753 | } |
| 2754 | |
| 2755 | |
| 2756 | Object* Heap::AllocateJSObjectFromMap(Map* map, PretenureFlag pretenure) { |
| 2757 | // JSFunctions should be allocated using AllocateFunction to be |
| 2758 | // properly initialized. |
| 2759 | ASSERT(map->instance_type() != JS_FUNCTION_TYPE); |
| 2760 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 2761 | // Both types of global objects should be allocated using |
| 2762 | // AllocateGlobalObject to be properly initialized. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2763 | ASSERT(map->instance_type() != JS_GLOBAL_OBJECT_TYPE); |
| 2764 | ASSERT(map->instance_type() != JS_BUILTINS_OBJECT_TYPE); |
| 2765 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2766 | // Allocate the backing storage for the properties. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2767 | int prop_size = |
| 2768 | map->pre_allocated_property_fields() + |
| 2769 | map->unused_property_fields() - |
| 2770 | map->inobject_properties(); |
| 2771 | ASSERT(prop_size >= 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2772 | Object* properties = AllocateFixedArray(prop_size, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2773 | if (properties->IsFailure()) return properties; |
| 2774 | |
| 2775 | // Allocate the JSObject. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2776 | AllocationSpace space = |
| 2777 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2778 | if (map->instance_size() > MaxObjectSizeInPagedSpace()) space = LO_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2779 | Object* obj = Allocate(map, space); |
| 2780 | if (obj->IsFailure()) return obj; |
| 2781 | |
| 2782 | // Initialize the JSObject. |
| 2783 | InitializeJSObjectFromMap(JSObject::cast(obj), |
| 2784 | FixedArray::cast(properties), |
| 2785 | map); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 2786 | ASSERT(JSObject::cast(obj)->HasFastElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2787 | return obj; |
| 2788 | } |
| 2789 | |
| 2790 | |
| 2791 | Object* Heap::AllocateJSObject(JSFunction* constructor, |
| 2792 | PretenureFlag pretenure) { |
| 2793 | // Allocate the initial map if absent. |
| 2794 | if (!constructor->has_initial_map()) { |
| 2795 | Object* initial_map = AllocateInitialMap(constructor); |
| 2796 | if (initial_map->IsFailure()) return initial_map; |
| 2797 | constructor->set_initial_map(Map::cast(initial_map)); |
| 2798 | Map::cast(initial_map)->set_constructor(constructor); |
| 2799 | } |
| 2800 | // Allocate the object based on the constructors initial map. |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2801 | Object* result = |
| 2802 | AllocateJSObjectFromMap(constructor->initial_map(), pretenure); |
| 2803 | // Make sure result is NOT a global object if valid. |
| 2804 | ASSERT(result->IsFailure() || !result->IsGlobalObject()); |
| 2805 | return result; |
| 2806 | } |
| 2807 | |
| 2808 | |
| 2809 | Object* Heap::AllocateGlobalObject(JSFunction* constructor) { |
| 2810 | ASSERT(constructor->has_initial_map()); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2811 | Map* map = constructor->initial_map(); |
| 2812 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2813 | // Make sure no field properties are described in the initial map. |
| 2814 | // This guarantees us that normalizing the properties does not |
| 2815 | // require us to change property values to JSGlobalPropertyCells. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2816 | ASSERT(map->NextFreePropertyIndex() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2817 | |
| 2818 | // Make sure we don't have a ton of pre-allocated slots in the |
| 2819 | // global objects. They will be unused once we normalize the object. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2820 | ASSERT(map->unused_property_fields() == 0); |
| 2821 | ASSERT(map->inobject_properties() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2822 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2823 | // Initial size of the backing store to avoid resize of the storage during |
| 2824 | // bootstrapping. The size differs between the JS global object ad the |
| 2825 | // builtins object. |
| 2826 | 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] | 2827 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2828 | // Allocate a dictionary object for backing storage. |
| 2829 | Object* obj = |
| 2830 | StringDictionary::Allocate( |
| 2831 | map->NumberOfDescribedProperties() * 2 + initial_size); |
| 2832 | if (obj->IsFailure()) return obj; |
| 2833 | StringDictionary* dictionary = StringDictionary::cast(obj); |
| 2834 | |
| 2835 | // The global object might be created from an object template with accessors. |
| 2836 | // Fill these accessors into the dictionary. |
| 2837 | DescriptorArray* descs = map->instance_descriptors(); |
| 2838 | for (int i = 0; i < descs->number_of_descriptors(); i++) { |
| 2839 | PropertyDetails details = descs->GetDetails(i); |
| 2840 | ASSERT(details.type() == CALLBACKS); // Only accessors are expected. |
| 2841 | PropertyDetails d = |
| 2842 | PropertyDetails(details.attributes(), CALLBACKS, details.index()); |
| 2843 | Object* value = descs->GetCallbacksObject(i); |
| 2844 | value = Heap::AllocateJSGlobalPropertyCell(value); |
| 2845 | if (value->IsFailure()) return value; |
| 2846 | |
| 2847 | Object* result = dictionary->Add(descs->GetKey(i), value, d); |
| 2848 | if (result->IsFailure()) return result; |
| 2849 | dictionary = StringDictionary::cast(result); |
| 2850 | } |
| 2851 | |
| 2852 | // Allocate the global object and initialize it with the backing store. |
| 2853 | obj = Allocate(map, OLD_POINTER_SPACE); |
| 2854 | if (obj->IsFailure()) return obj; |
| 2855 | JSObject* global = JSObject::cast(obj); |
| 2856 | InitializeJSObjectFromMap(global, dictionary, map); |
| 2857 | |
| 2858 | // Create a new map for the global object. |
| 2859 | obj = map->CopyDropDescriptors(); |
| 2860 | if (obj->IsFailure()) return obj; |
| 2861 | Map* new_map = Map::cast(obj); |
| 2862 | |
| 2863 | // Setup the global object as a normalized object. |
| 2864 | global->set_map(new_map); |
| 2865 | global->map()->set_instance_descriptors(Heap::empty_descriptor_array()); |
| 2866 | global->set_properties(dictionary); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2867 | |
| 2868 | // Make sure result is a global object with properties in dictionary. |
| 2869 | ASSERT(global->IsGlobalObject()); |
| 2870 | ASSERT(!global->HasFastProperties()); |
| 2871 | return global; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2872 | } |
| 2873 | |
| 2874 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2875 | Object* Heap::CopyJSObject(JSObject* source) { |
| 2876 | // Never used to copy functions. If functions need to be copied we |
| 2877 | // have to be careful to clear the literals array. |
| 2878 | ASSERT(!source->IsJSFunction()); |
| 2879 | |
| 2880 | // Make the clone. |
| 2881 | Map* map = source->map(); |
| 2882 | int object_size = map->instance_size(); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2883 | Object* clone; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2884 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2885 | // If we're forced to always allocate, we use the general allocation |
| 2886 | // functions which may leave us with an object in old space. |
| 2887 | if (always_allocate()) { |
| 2888 | clone = AllocateRaw(object_size, NEW_SPACE, OLD_POINTER_SPACE); |
| 2889 | if (clone->IsFailure()) return clone; |
| 2890 | Address clone_address = HeapObject::cast(clone)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2891 | CopyBlock(clone_address, |
| 2892 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2893 | object_size); |
| 2894 | // Update write barrier for all fields that lie beyond the header. |
vegorov@chromium.org | f837290 | 2010-03-15 10:26:20 +0000 | [diff] [blame] | 2895 | RecordWrites(clone_address, |
| 2896 | JSObject::kHeaderSize, |
antonm@chromium.org | 8e5e338 | 2010-03-24 09:56:30 +0000 | [diff] [blame] | 2897 | (object_size - JSObject::kHeaderSize) / kPointerSize); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2898 | } else { |
| 2899 | clone = new_space_.AllocateRaw(object_size); |
| 2900 | if (clone->IsFailure()) return clone; |
| 2901 | ASSERT(Heap::InNewSpace(clone)); |
| 2902 | // 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] | 2903 | // the contents without worrying about updating the write barrier. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2904 | CopyBlock(HeapObject::cast(clone)->address(), |
| 2905 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2906 | object_size); |
| 2907 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2908 | |
| 2909 | FixedArray* elements = FixedArray::cast(source->elements()); |
| 2910 | FixedArray* properties = FixedArray::cast(source->properties()); |
| 2911 | // Update elements if necessary. |
ager@chromium.org | b26c50a | 2010-03-26 09:27:16 +0000 | [diff] [blame] | 2912 | if (elements->length() > 0) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2913 | Object* elem = CopyFixedArray(elements); |
| 2914 | if (elem->IsFailure()) return elem; |
| 2915 | JSObject::cast(clone)->set_elements(FixedArray::cast(elem)); |
| 2916 | } |
| 2917 | // Update properties if necessary. |
| 2918 | if (properties->length() > 0) { |
| 2919 | Object* prop = CopyFixedArray(properties); |
| 2920 | if (prop->IsFailure()) return prop; |
| 2921 | JSObject::cast(clone)->set_properties(FixedArray::cast(prop)); |
| 2922 | } |
| 2923 | // Return the new clone. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2924 | #ifdef ENABLE_LOGGING_AND_PROFILING |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 2925 | ProducerHeapProfile::RecordJSObjectAllocation(clone); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2926 | #endif |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2927 | return clone; |
| 2928 | } |
| 2929 | |
| 2930 | |
| 2931 | Object* Heap::ReinitializeJSGlobalProxy(JSFunction* constructor, |
| 2932 | JSGlobalProxy* object) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2933 | // Allocate initial map if absent. |
| 2934 | if (!constructor->has_initial_map()) { |
| 2935 | Object* initial_map = AllocateInitialMap(constructor); |
| 2936 | if (initial_map->IsFailure()) return initial_map; |
| 2937 | constructor->set_initial_map(Map::cast(initial_map)); |
| 2938 | Map::cast(initial_map)->set_constructor(constructor); |
| 2939 | } |
| 2940 | |
| 2941 | Map* map = constructor->initial_map(); |
| 2942 | |
| 2943 | // Check that the already allocated object has the same size as |
| 2944 | // objects allocated using the constructor. |
| 2945 | ASSERT(map->instance_size() == object->map()->instance_size()); |
| 2946 | |
| 2947 | // Allocate the backing storage for the properties. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2948 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 2949 | Object* properties = AllocateFixedArray(prop_size, TENURED); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2950 | if (properties->IsFailure()) return properties; |
| 2951 | |
| 2952 | // Reset the map for the object. |
| 2953 | object->set_map(constructor->initial_map()); |
| 2954 | |
| 2955 | // Reinitialize the object from the constructor map. |
| 2956 | InitializeJSObjectFromMap(object, FixedArray::cast(properties), map); |
| 2957 | return object; |
| 2958 | } |
| 2959 | |
| 2960 | |
| 2961 | Object* Heap::AllocateStringFromAscii(Vector<const char> string, |
| 2962 | PretenureFlag pretenure) { |
| 2963 | Object* result = AllocateRawAsciiString(string.length(), pretenure); |
| 2964 | if (result->IsFailure()) return result; |
| 2965 | |
| 2966 | // Copy the characters into the new object. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2967 | SeqAsciiString* string_result = SeqAsciiString::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2968 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2969 | string_result->SeqAsciiStringSet(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2970 | } |
| 2971 | return result; |
| 2972 | } |
| 2973 | |
| 2974 | |
| 2975 | Object* Heap::AllocateStringFromUtf8(Vector<const char> string, |
| 2976 | PretenureFlag pretenure) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2977 | // V8 only supports characters in the Basic Multilingual Plane. |
| 2978 | const uc32 kMaxSupportedChar = 0xFFFF; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2979 | // Count the number of characters in the UTF-8 string and check if |
| 2980 | // it is an ASCII string. |
| 2981 | Access<Scanner::Utf8Decoder> decoder(Scanner::utf8_decoder()); |
| 2982 | decoder->Reset(string.start(), string.length()); |
| 2983 | int chars = 0; |
| 2984 | bool is_ascii = true; |
| 2985 | while (decoder->has_more()) { |
| 2986 | uc32 r = decoder->GetNext(); |
| 2987 | if (r > String::kMaxAsciiCharCode) is_ascii = false; |
| 2988 | chars++; |
| 2989 | } |
| 2990 | |
| 2991 | // If the string is ascii, we do not need to convert the characters |
| 2992 | // since UTF8 is backwards compatible with ascii. |
| 2993 | if (is_ascii) return AllocateStringFromAscii(string, pretenure); |
| 2994 | |
| 2995 | Object* result = AllocateRawTwoByteString(chars, pretenure); |
| 2996 | if (result->IsFailure()) return result; |
| 2997 | |
| 2998 | // Convert and copy the characters into the new object. |
| 2999 | String* string_result = String::cast(result); |
| 3000 | decoder->Reset(string.start(), string.length()); |
| 3001 | for (int i = 0; i < chars; i++) { |
| 3002 | uc32 r = decoder->GetNext(); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3003 | if (r > kMaxSupportedChar) { r = unibrow::Utf8::kBadChar; } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3004 | string_result->Set(i, r); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3005 | } |
| 3006 | return result; |
| 3007 | } |
| 3008 | |
| 3009 | |
| 3010 | Object* Heap::AllocateStringFromTwoByte(Vector<const uc16> string, |
| 3011 | PretenureFlag pretenure) { |
| 3012 | // Check if the string is an ASCII string. |
| 3013 | int i = 0; |
| 3014 | while (i < string.length() && string[i] <= String::kMaxAsciiCharCode) i++; |
| 3015 | |
| 3016 | Object* result; |
| 3017 | if (i == string.length()) { // It's an ASCII string. |
| 3018 | result = AllocateRawAsciiString(string.length(), pretenure); |
| 3019 | } else { // It's not an ASCII string. |
| 3020 | result = AllocateRawTwoByteString(string.length(), pretenure); |
| 3021 | } |
| 3022 | if (result->IsFailure()) return result; |
| 3023 | |
| 3024 | // Copy the characters into the new object, which may be either ASCII or |
| 3025 | // UTF-16. |
| 3026 | String* string_result = String::cast(result); |
| 3027 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3028 | string_result->Set(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3029 | } |
| 3030 | return result; |
| 3031 | } |
| 3032 | |
| 3033 | |
| 3034 | Map* Heap::SymbolMapForString(String* string) { |
| 3035 | // If the string is in new space it cannot be used as a symbol. |
| 3036 | if (InNewSpace(string)) return NULL; |
| 3037 | |
| 3038 | // Find the corresponding symbol map for strings. |
| 3039 | Map* map = string->map(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3040 | if (map == ascii_string_map()) return ascii_symbol_map(); |
| 3041 | if (map == string_map()) return symbol_map(); |
| 3042 | if (map == cons_string_map()) return cons_symbol_map(); |
| 3043 | if (map == cons_ascii_string_map()) return cons_ascii_symbol_map(); |
| 3044 | if (map == external_string_map()) return external_symbol_map(); |
| 3045 | if (map == external_ascii_string_map()) return external_ascii_symbol_map(); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 3046 | if (map == external_string_with_ascii_data_map()) { |
| 3047 | return external_symbol_with_ascii_data_map(); |
| 3048 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3049 | |
| 3050 | // No match found. |
| 3051 | return NULL; |
| 3052 | } |
| 3053 | |
| 3054 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 3055 | Object* Heap::AllocateInternalSymbol(unibrow::CharacterStream* buffer, |
| 3056 | int chars, |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3057 | uint32_t hash_field) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3058 | ASSERT(chars >= 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3059 | // Ensure the chars matches the number of characters in the buffer. |
| 3060 | ASSERT(static_cast<unsigned>(chars) == buffer->Length()); |
| 3061 | // Determine whether the string is ascii. |
| 3062 | bool is_ascii = true; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3063 | while (buffer->has_more()) { |
| 3064 | if (buffer->GetNext() > unibrow::Utf8::kMaxOneByteChar) { |
| 3065 | is_ascii = false; |
| 3066 | break; |
| 3067 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3068 | } |
| 3069 | buffer->Rewind(); |
| 3070 | |
| 3071 | // Compute map and object size. |
| 3072 | int size; |
| 3073 | Map* map; |
| 3074 | |
| 3075 | if (is_ascii) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3076 | if (chars > SeqAsciiString::kMaxLength) { |
| 3077 | return Failure::OutOfMemoryException(); |
| 3078 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3079 | map = ascii_symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3080 | size = SeqAsciiString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3081 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3082 | if (chars > SeqTwoByteString::kMaxLength) { |
| 3083 | return Failure::OutOfMemoryException(); |
| 3084 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3085 | map = symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3086 | size = SeqTwoByteString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3087 | } |
| 3088 | |
| 3089 | // Allocate string. |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3090 | Object* result = (size > MaxObjectSizeInPagedSpace()) |
| 3091 | ? lo_space_->AllocateRaw(size) |
| 3092 | : old_data_space_->AllocateRaw(size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3093 | if (result->IsFailure()) return result; |
| 3094 | |
| 3095 | reinterpret_cast<HeapObject*>(result)->set_map(map); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3096 | // Set length and hash fields of the allocated string. |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3097 | String* answer = String::cast(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3098 | answer->set_length(chars); |
| 3099 | answer->set_hash_field(hash_field); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3100 | |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3101 | ASSERT_EQ(size, answer->Size()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3102 | |
| 3103 | // Fill in the characters. |
| 3104 | for (int i = 0; i < chars; i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3105 | answer->Set(i, buffer->GetNext()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3106 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3107 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3108 | } |
| 3109 | |
| 3110 | |
| 3111 | Object* Heap::AllocateRawAsciiString(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3112 | if (length < 0 || length > SeqAsciiString::kMaxLength) { |
| 3113 | return Failure::OutOfMemoryException(); |
| 3114 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3115 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3116 | int size = SeqAsciiString::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3117 | ASSERT(size <= SeqAsciiString::kMaxSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3118 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3119 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3120 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 3121 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3122 | if (space == NEW_SPACE) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3123 | if (size > kMaxObjectSizeInNewSpace) { |
| 3124 | // Allocate in large object space, retry space will be ignored. |
| 3125 | space = LO_SPACE; |
| 3126 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 3127 | // Allocate in new space, retry in large object space. |
| 3128 | retry_space = LO_SPACE; |
| 3129 | } |
| 3130 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 3131 | space = LO_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3132 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3133 | Object* result = AllocateRaw(size, space, retry_space); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3134 | if (result->IsFailure()) return result; |
| 3135 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3136 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3137 | HeapObject::cast(result)->set_map(ascii_string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3138 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3139 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3140 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 3141 | return result; |
| 3142 | } |
| 3143 | |
| 3144 | |
| 3145 | Object* Heap::AllocateRawTwoByteString(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3146 | if (length < 0 || length > SeqTwoByteString::kMaxLength) { |
| 3147 | return Failure::OutOfMemoryException(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3148 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3149 | int size = SeqTwoByteString::SizeFor(length); |
| 3150 | ASSERT(size <= SeqTwoByteString::kMaxSize); |
| 3151 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3152 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 3153 | |
| 3154 | if (space == NEW_SPACE) { |
| 3155 | if (size > kMaxObjectSizeInNewSpace) { |
| 3156 | // Allocate in large object space, retry space will be ignored. |
| 3157 | space = LO_SPACE; |
| 3158 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 3159 | // Allocate in new space, retry in large object space. |
| 3160 | retry_space = LO_SPACE; |
| 3161 | } |
| 3162 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 3163 | space = LO_SPACE; |
| 3164 | } |
| 3165 | Object* result = AllocateRaw(size, space, retry_space); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3166 | if (result->IsFailure()) return result; |
| 3167 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3168 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3169 | HeapObject::cast(result)->set_map(string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3170 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3171 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3172 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 3173 | return result; |
| 3174 | } |
| 3175 | |
| 3176 | |
| 3177 | Object* Heap::AllocateEmptyFixedArray() { |
| 3178 | int size = FixedArray::SizeFor(0); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3179 | Object* result = AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3180 | if (result->IsFailure()) return result; |
| 3181 | // Initialize the object. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3182 | reinterpret_cast<FixedArray*>(result)->set_map(fixed_array_map()); |
| 3183 | reinterpret_cast<FixedArray*>(result)->set_length(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3184 | return result; |
| 3185 | } |
| 3186 | |
| 3187 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3188 | Object* Heap::AllocateRawFixedArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3189 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 3190 | return Failure::OutOfMemoryException(); |
| 3191 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3192 | // Use the general function if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3193 | if (always_allocate()) return AllocateFixedArray(length, TENURED); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3194 | // Allocate the raw data for a fixed array. |
| 3195 | int size = FixedArray::SizeFor(length); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3196 | return size <= kMaxObjectSizeInNewSpace |
| 3197 | ? new_space_.AllocateRaw(size) |
| 3198 | : lo_space_->AllocateRawFixedArray(size); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3199 | } |
| 3200 | |
| 3201 | |
| 3202 | Object* Heap::CopyFixedArray(FixedArray* src) { |
| 3203 | int len = src->length(); |
| 3204 | Object* obj = AllocateRawFixedArray(len); |
| 3205 | if (obj->IsFailure()) return obj; |
| 3206 | if (Heap::InNewSpace(obj)) { |
| 3207 | HeapObject* dst = HeapObject::cast(obj); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3208 | CopyBlock(dst->address(), src->address(), FixedArray::SizeFor(len)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3209 | return obj; |
| 3210 | } |
| 3211 | HeapObject::cast(obj)->set_map(src->map()); |
| 3212 | FixedArray* result = FixedArray::cast(obj); |
| 3213 | result->set_length(len); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3214 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3215 | // Copy the content |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3216 | AssertNoAllocation no_gc; |
| 3217 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3218 | for (int i = 0; i < len; i++) result->set(i, src->get(i), mode); |
| 3219 | return result; |
| 3220 | } |
| 3221 | |
| 3222 | |
| 3223 | Object* Heap::AllocateFixedArray(int length) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3224 | ASSERT(length >= 0); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3225 | if (length == 0) return empty_fixed_array(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3226 | Object* result = AllocateRawFixedArray(length); |
| 3227 | if (!result->IsFailure()) { |
| 3228 | // Initialize header. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3229 | FixedArray* array = reinterpret_cast<FixedArray*>(result); |
| 3230 | array->set_map(fixed_array_map()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3231 | array->set_length(length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3232 | // Initialize body. |
vegorov@chromium.org | f837290 | 2010-03-15 10:26:20 +0000 | [diff] [blame] | 3233 | ASSERT(!Heap::InNewSpace(undefined_value())); |
| 3234 | MemsetPointer(array->data_start(), undefined_value(), length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3235 | } |
| 3236 | return result; |
| 3237 | } |
| 3238 | |
| 3239 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3240 | Object* Heap::AllocateRawFixedArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3241 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 3242 | return Failure::OutOfMemoryException(); |
| 3243 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3244 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3245 | AllocationSpace space = |
| 3246 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3247 | int size = FixedArray::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3248 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 3249 | // Too big for new space. |
| 3250 | space = LO_SPACE; |
| 3251 | } else if (space == OLD_POINTER_SPACE && |
| 3252 | size > MaxObjectSizeInPagedSpace()) { |
| 3253 | // Too big for old pointer space. |
| 3254 | space = LO_SPACE; |
| 3255 | } |
| 3256 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3257 | AllocationSpace retry_space = |
| 3258 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_POINTER_SPACE : LO_SPACE; |
| 3259 | |
| 3260 | return AllocateRaw(size, space, retry_space); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3261 | } |
| 3262 | |
| 3263 | |
| 3264 | static Object* AllocateFixedArrayWithFiller(int length, |
| 3265 | PretenureFlag pretenure, |
| 3266 | Object* filler) { |
| 3267 | ASSERT(length >= 0); |
| 3268 | ASSERT(Heap::empty_fixed_array()->IsFixedArray()); |
| 3269 | if (length == 0) return Heap::empty_fixed_array(); |
| 3270 | |
| 3271 | ASSERT(!Heap::InNewSpace(filler)); |
| 3272 | Object* result = Heap::AllocateRawFixedArray(length, pretenure); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3273 | if (result->IsFailure()) return result; |
| 3274 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3275 | HeapObject::cast(result)->set_map(Heap::fixed_array_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3276 | FixedArray* array = FixedArray::cast(result); |
| 3277 | array->set_length(length); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3278 | MemsetPointer(array->data_start(), filler, length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3279 | return array; |
| 3280 | } |
| 3281 | |
| 3282 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3283 | Object* Heap::AllocateFixedArray(int length, PretenureFlag pretenure) { |
| 3284 | return AllocateFixedArrayWithFiller(length, pretenure, undefined_value()); |
| 3285 | } |
| 3286 | |
| 3287 | |
| 3288 | Object* Heap::AllocateFixedArrayWithHoles(int length, PretenureFlag pretenure) { |
| 3289 | return AllocateFixedArrayWithFiller(length, pretenure, the_hole_value()); |
| 3290 | } |
| 3291 | |
| 3292 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3293 | Object* Heap::AllocateUninitializedFixedArray(int length) { |
| 3294 | if (length == 0) return empty_fixed_array(); |
| 3295 | |
| 3296 | Object* obj = AllocateRawFixedArray(length); |
| 3297 | if (obj->IsFailure()) return obj; |
| 3298 | |
| 3299 | reinterpret_cast<FixedArray*>(obj)->set_map(fixed_array_map()); |
| 3300 | FixedArray::cast(obj)->set_length(length); |
| 3301 | return obj; |
| 3302 | } |
| 3303 | |
| 3304 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3305 | Object* Heap::AllocateHashTable(int length, PretenureFlag pretenure) { |
| 3306 | Object* result = Heap::AllocateFixedArray(length, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3307 | if (result->IsFailure()) return result; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3308 | reinterpret_cast<HeapObject*>(result)->set_map(hash_table_map()); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 3309 | ASSERT(result->IsHashTable()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3310 | return result; |
| 3311 | } |
| 3312 | |
| 3313 | |
| 3314 | Object* Heap::AllocateGlobalContext() { |
| 3315 | Object* result = Heap::AllocateFixedArray(Context::GLOBAL_CONTEXT_SLOTS); |
| 3316 | if (result->IsFailure()) return result; |
| 3317 | Context* context = reinterpret_cast<Context*>(result); |
| 3318 | context->set_map(global_context_map()); |
| 3319 | ASSERT(context->IsGlobalContext()); |
| 3320 | ASSERT(result->IsContext()); |
| 3321 | return result; |
| 3322 | } |
| 3323 | |
| 3324 | |
| 3325 | Object* Heap::AllocateFunctionContext(int length, JSFunction* function) { |
| 3326 | ASSERT(length >= Context::MIN_CONTEXT_SLOTS); |
| 3327 | Object* result = Heap::AllocateFixedArray(length); |
| 3328 | if (result->IsFailure()) return result; |
| 3329 | Context* context = reinterpret_cast<Context*>(result); |
| 3330 | context->set_map(context_map()); |
| 3331 | context->set_closure(function); |
| 3332 | context->set_fcontext(context); |
| 3333 | context->set_previous(NULL); |
| 3334 | context->set_extension(NULL); |
| 3335 | context->set_global(function->context()->global()); |
| 3336 | ASSERT(!context->IsGlobalContext()); |
| 3337 | ASSERT(context->is_function_context()); |
| 3338 | ASSERT(result->IsContext()); |
| 3339 | return result; |
| 3340 | } |
| 3341 | |
| 3342 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3343 | Object* Heap::AllocateWithContext(Context* previous, |
| 3344 | JSObject* extension, |
| 3345 | bool is_catch_context) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3346 | Object* result = Heap::AllocateFixedArray(Context::MIN_CONTEXT_SLOTS); |
| 3347 | if (result->IsFailure()) return result; |
| 3348 | Context* context = reinterpret_cast<Context*>(result); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3349 | context->set_map(is_catch_context ? catch_context_map() : context_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3350 | context->set_closure(previous->closure()); |
| 3351 | context->set_fcontext(previous->fcontext()); |
| 3352 | context->set_previous(previous); |
| 3353 | context->set_extension(extension); |
| 3354 | context->set_global(previous->global()); |
| 3355 | ASSERT(!context->IsGlobalContext()); |
| 3356 | ASSERT(!context->is_function_context()); |
| 3357 | ASSERT(result->IsContext()); |
| 3358 | return result; |
| 3359 | } |
| 3360 | |
| 3361 | |
| 3362 | Object* Heap::AllocateStruct(InstanceType type) { |
| 3363 | Map* map; |
| 3364 | switch (type) { |
| 3365 | #define MAKE_CASE(NAME, Name, name) case NAME##_TYPE: map = name##_map(); break; |
| 3366 | STRUCT_LIST(MAKE_CASE) |
| 3367 | #undef MAKE_CASE |
| 3368 | default: |
| 3369 | UNREACHABLE(); |
| 3370 | return Failure::InternalError(); |
| 3371 | } |
| 3372 | int size = map->instance_size(); |
| 3373 | AllocationSpace space = |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3374 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : OLD_POINTER_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3375 | Object* result = Heap::Allocate(map, space); |
| 3376 | if (result->IsFailure()) return result; |
| 3377 | Struct::cast(result)->InitializeBody(size); |
| 3378 | return result; |
| 3379 | } |
| 3380 | |
| 3381 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3382 | bool Heap::IdleNotification() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3383 | static const int kIdlesBeforeScavenge = 4; |
| 3384 | static const int kIdlesBeforeMarkSweep = 7; |
| 3385 | static const int kIdlesBeforeMarkCompact = 8; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3386 | static int number_idle_notifications = 0; |
| 3387 | static int last_gc_count = gc_count_; |
| 3388 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3389 | bool uncommit = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3390 | bool finished = false; |
| 3391 | |
| 3392 | if (last_gc_count == gc_count_) { |
| 3393 | number_idle_notifications++; |
| 3394 | } else { |
| 3395 | number_idle_notifications = 0; |
| 3396 | last_gc_count = gc_count_; |
| 3397 | } |
| 3398 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3399 | if (number_idle_notifications == kIdlesBeforeScavenge) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3400 | if (contexts_disposed_ > 0) { |
| 3401 | HistogramTimerScope scope(&Counters::gc_context); |
| 3402 | CollectAllGarbage(false); |
| 3403 | } else { |
| 3404 | CollectGarbage(0, NEW_SPACE); |
| 3405 | } |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3406 | new_space_.Shrink(); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3407 | last_gc_count = gc_count_; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3408 | |
| 3409 | } else if (number_idle_notifications == kIdlesBeforeMarkSweep) { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3410 | // Before doing the mark-sweep collections we clear the |
| 3411 | // compilation cache to avoid hanging on to source code and |
| 3412 | // generated code for cached functions. |
| 3413 | CompilationCache::Clear(); |
| 3414 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3415 | CollectAllGarbage(false); |
| 3416 | new_space_.Shrink(); |
| 3417 | last_gc_count = gc_count_; |
| 3418 | |
| 3419 | } else if (number_idle_notifications == kIdlesBeforeMarkCompact) { |
| 3420 | CollectAllGarbage(true); |
| 3421 | new_space_.Shrink(); |
| 3422 | last_gc_count = gc_count_; |
| 3423 | number_idle_notifications = 0; |
| 3424 | finished = true; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3425 | |
| 3426 | } else if (contexts_disposed_ > 0) { |
| 3427 | if (FLAG_expose_gc) { |
| 3428 | contexts_disposed_ = 0; |
| 3429 | } else { |
| 3430 | HistogramTimerScope scope(&Counters::gc_context); |
| 3431 | CollectAllGarbage(false); |
| 3432 | last_gc_count = gc_count_; |
| 3433 | } |
| 3434 | // If this is the first idle notification, we reset the |
| 3435 | // notification count to avoid letting idle notifications for |
| 3436 | // context disposal garbage collections start a potentially too |
| 3437 | // aggressive idle GC cycle. |
| 3438 | if (number_idle_notifications <= 1) { |
| 3439 | number_idle_notifications = 0; |
| 3440 | uncommit = false; |
| 3441 | } |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3442 | } |
| 3443 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3444 | // Make sure that we have no pending context disposals and |
| 3445 | // conditionally uncommit from space. |
| 3446 | ASSERT(contexts_disposed_ == 0); |
| 3447 | if (uncommit) Heap::UncommitFromSpace(); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3448 | return finished; |
| 3449 | } |
| 3450 | |
| 3451 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3452 | #ifdef DEBUG |
| 3453 | |
| 3454 | void Heap::Print() { |
| 3455 | if (!HasBeenSetup()) return; |
| 3456 | Top::PrintStack(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3457 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3458 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 3459 | space->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3460 | } |
| 3461 | |
| 3462 | |
| 3463 | void Heap::ReportCodeStatistics(const char* title) { |
| 3464 | PrintF(">>>>>> Code Stats (%s) >>>>>>\n", title); |
| 3465 | PagedSpace::ResetCodeStatistics(); |
| 3466 | // We do not look for code in new space, map space, or old space. If code |
| 3467 | // somehow ends up in those spaces, we would miss it here. |
| 3468 | code_space_->CollectCodeStatistics(); |
| 3469 | lo_space_->CollectCodeStatistics(); |
| 3470 | PagedSpace::ReportCodeStatistics(); |
| 3471 | } |
| 3472 | |
| 3473 | |
| 3474 | // This function expects that NewSpace's allocated objects histogram is |
| 3475 | // populated (via a call to CollectStatistics or else as a side effect of a |
| 3476 | // just-completed scavenge collection). |
| 3477 | void Heap::ReportHeapStatistics(const char* title) { |
| 3478 | USE(title); |
| 3479 | PrintF(">>>>>> =============== %s (%d) =============== >>>>>>\n", |
| 3480 | title, gc_count_); |
| 3481 | PrintF("mark-compact GC : %d\n", mc_count_); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3482 | PrintF("old_gen_promotion_limit_ %d\n", old_gen_promotion_limit_); |
| 3483 | PrintF("old_gen_allocation_limit_ %d\n", old_gen_allocation_limit_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3484 | |
| 3485 | PrintF("\n"); |
| 3486 | PrintF("Number of handles : %d\n", HandleScope::NumberOfHandles()); |
| 3487 | GlobalHandles::PrintStats(); |
| 3488 | PrintF("\n"); |
| 3489 | |
| 3490 | PrintF("Heap statistics : "); |
| 3491 | MemoryAllocator::ReportStatistics(); |
| 3492 | PrintF("To space : "); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3493 | new_space_.ReportStatistics(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3494 | PrintF("Old pointer space : "); |
| 3495 | old_pointer_space_->ReportStatistics(); |
| 3496 | PrintF("Old data space : "); |
| 3497 | old_data_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3498 | PrintF("Code space : "); |
| 3499 | code_space_->ReportStatistics(); |
| 3500 | PrintF("Map space : "); |
| 3501 | map_space_->ReportStatistics(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3502 | PrintF("Cell space : "); |
| 3503 | cell_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3504 | PrintF("Large object space : "); |
| 3505 | lo_space_->ReportStatistics(); |
| 3506 | PrintF(">>>>>> ========================================= >>>>>>\n"); |
| 3507 | } |
| 3508 | |
| 3509 | #endif // DEBUG |
| 3510 | |
| 3511 | bool Heap::Contains(HeapObject* value) { |
| 3512 | return Contains(value->address()); |
| 3513 | } |
| 3514 | |
| 3515 | |
| 3516 | bool Heap::Contains(Address addr) { |
| 3517 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 3518 | return HasBeenSetup() && |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3519 | (new_space_.ToSpaceContains(addr) || |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3520 | old_pointer_space_->Contains(addr) || |
| 3521 | old_data_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3522 | code_space_->Contains(addr) || |
| 3523 | map_space_->Contains(addr) || |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3524 | cell_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3525 | lo_space_->SlowContains(addr)); |
| 3526 | } |
| 3527 | |
| 3528 | |
| 3529 | bool Heap::InSpace(HeapObject* value, AllocationSpace space) { |
| 3530 | return InSpace(value->address(), space); |
| 3531 | } |
| 3532 | |
| 3533 | |
| 3534 | bool Heap::InSpace(Address addr, AllocationSpace space) { |
| 3535 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 3536 | if (!HasBeenSetup()) return false; |
| 3537 | |
| 3538 | switch (space) { |
| 3539 | case NEW_SPACE: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3540 | return new_space_.ToSpaceContains(addr); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3541 | case OLD_POINTER_SPACE: |
| 3542 | return old_pointer_space_->Contains(addr); |
| 3543 | case OLD_DATA_SPACE: |
| 3544 | return old_data_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3545 | case CODE_SPACE: |
| 3546 | return code_space_->Contains(addr); |
| 3547 | case MAP_SPACE: |
| 3548 | return map_space_->Contains(addr); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3549 | case CELL_SPACE: |
| 3550 | return cell_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3551 | case LO_SPACE: |
| 3552 | return lo_space_->SlowContains(addr); |
| 3553 | } |
| 3554 | |
| 3555 | return false; |
| 3556 | } |
| 3557 | |
| 3558 | |
| 3559 | #ifdef DEBUG |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3560 | static void DummyScavengePointer(HeapObject** p) { |
| 3561 | } |
| 3562 | |
| 3563 | |
| 3564 | static void VerifyPointersUnderWatermark( |
| 3565 | PagedSpace* space, |
| 3566 | DirtyRegionCallback visit_dirty_region) { |
| 3567 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 3568 | |
| 3569 | while (it.has_next()) { |
| 3570 | Page* page = it.next(); |
| 3571 | Address start = page->ObjectAreaStart(); |
| 3572 | Address end = page->AllocationWatermark(); |
| 3573 | |
| 3574 | Heap::IterateDirtyRegions(Page::kAllRegionsDirtyMarks, |
| 3575 | start, |
| 3576 | end, |
| 3577 | visit_dirty_region, |
| 3578 | &DummyScavengePointer); |
| 3579 | } |
| 3580 | } |
| 3581 | |
| 3582 | |
| 3583 | static void VerifyPointersUnderWatermark(LargeObjectSpace* space) { |
| 3584 | LargeObjectIterator it(space); |
| 3585 | for (HeapObject* object = it.next(); object != NULL; object = it.next()) { |
| 3586 | if (object->IsFixedArray()) { |
| 3587 | Address slot_address = object->address(); |
| 3588 | Address end = object->address() + object->Size(); |
| 3589 | |
| 3590 | while (slot_address < end) { |
| 3591 | HeapObject** slot = reinterpret_cast<HeapObject**>(slot_address); |
| 3592 | // When we are not in GC the Heap::InNewSpace() predicate |
| 3593 | // checks that pointers which satisfy predicate point into |
| 3594 | // the active semispace. |
| 3595 | Heap::InNewSpace(*slot); |
| 3596 | slot_address += kPointerSize; |
| 3597 | } |
| 3598 | } |
| 3599 | } |
| 3600 | } |
| 3601 | |
| 3602 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3603 | void Heap::Verify() { |
| 3604 | ASSERT(HasBeenSetup()); |
| 3605 | |
| 3606 | VerifyPointersVisitor visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3607 | IterateRoots(&visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3608 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3609 | new_space_.Verify(); |
| 3610 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3611 | VerifyPointersAndDirtyRegionsVisitor dirty_regions_visitor; |
| 3612 | old_pointer_space_->Verify(&dirty_regions_visitor); |
| 3613 | map_space_->Verify(&dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3614 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3615 | VerifyPointersUnderWatermark(old_pointer_space_, |
| 3616 | &IteratePointersInDirtyRegion); |
| 3617 | VerifyPointersUnderWatermark(map_space_, |
| 3618 | &IteratePointersInDirtyMapsRegion); |
| 3619 | VerifyPointersUnderWatermark(lo_space_); |
| 3620 | |
| 3621 | VerifyPageWatermarkValidity(old_pointer_space_, ALL_INVALID); |
| 3622 | VerifyPageWatermarkValidity(map_space_, ALL_INVALID); |
| 3623 | |
| 3624 | VerifyPointersVisitor no_dirty_regions_visitor; |
| 3625 | old_data_space_->Verify(&no_dirty_regions_visitor); |
| 3626 | code_space_->Verify(&no_dirty_regions_visitor); |
| 3627 | cell_space_->Verify(&no_dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3628 | |
| 3629 | lo_space_->Verify(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3630 | } |
| 3631 | #endif // DEBUG |
| 3632 | |
| 3633 | |
| 3634 | Object* Heap::LookupSymbol(Vector<const char> string) { |
| 3635 | Object* symbol = NULL; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3636 | Object* new_table = symbol_table()->LookupSymbol(string, &symbol); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3637 | if (new_table->IsFailure()) return new_table; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3638 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 3639 | // SymbolTable is a singleton and checks for identity. |
| 3640 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3641 | ASSERT(symbol != NULL); |
| 3642 | return symbol; |
| 3643 | } |
| 3644 | |
| 3645 | |
| 3646 | Object* Heap::LookupSymbol(String* string) { |
| 3647 | if (string->IsSymbol()) return string; |
| 3648 | Object* symbol = NULL; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3649 | Object* new_table = symbol_table()->LookupString(string, &symbol); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3650 | if (new_table->IsFailure()) return new_table; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3651 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 3652 | // SymbolTable is a singleton and checks for identity. |
| 3653 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3654 | ASSERT(symbol != NULL); |
| 3655 | return symbol; |
| 3656 | } |
| 3657 | |
| 3658 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3659 | bool Heap::LookupSymbolIfExists(String* string, String** symbol) { |
| 3660 | if (string->IsSymbol()) { |
| 3661 | *symbol = string; |
| 3662 | return true; |
| 3663 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3664 | return symbol_table()->LookupSymbolIfExists(string, symbol); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3665 | } |
| 3666 | |
| 3667 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3668 | #ifdef DEBUG |
| 3669 | void Heap::ZapFromSpace() { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 3670 | ASSERT(reinterpret_cast<Object*>(kFromSpaceZapValue)->IsHeapObject()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3671 | for (Address a = new_space_.FromSpaceLow(); |
| 3672 | a < new_space_.FromSpaceHigh(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3673 | a += kPointerSize) { |
| 3674 | Memory::Address_at(a) = kFromSpaceZapValue; |
| 3675 | } |
| 3676 | } |
| 3677 | #endif // DEBUG |
| 3678 | |
| 3679 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3680 | bool Heap::IteratePointersInDirtyRegion(Address start, |
| 3681 | Address end, |
| 3682 | ObjectSlotCallback copy_object_func) { |
| 3683 | Address slot_address = start; |
| 3684 | bool pointers_to_new_space_found = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3685 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3686 | while (slot_address < end) { |
| 3687 | Object** slot = reinterpret_cast<Object**>(slot_address); |
| 3688 | if (Heap::InNewSpace(*slot)) { |
| 3689 | ASSERT((*slot)->IsHeapObject()); |
| 3690 | copy_object_func(reinterpret_cast<HeapObject**>(slot)); |
| 3691 | if (Heap::InNewSpace(*slot)) { |
| 3692 | ASSERT((*slot)->IsHeapObject()); |
| 3693 | pointers_to_new_space_found = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3694 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3695 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3696 | slot_address += kPointerSize; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3697 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3698 | return pointers_to_new_space_found; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3699 | } |
| 3700 | |
| 3701 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3702 | // Compute start address of the first map following given addr. |
| 3703 | static inline Address MapStartAlign(Address addr) { |
| 3704 | Address page = Page::FromAddress(addr)->ObjectAreaStart(); |
| 3705 | return page + (((addr - page) + (Map::kSize - 1)) / Map::kSize * Map::kSize); |
| 3706 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3707 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3708 | |
| 3709 | // Compute end address of the first map preceding given addr. |
| 3710 | static inline Address MapEndAlign(Address addr) { |
| 3711 | Address page = Page::FromAllocationTop(addr)->ObjectAreaStart(); |
| 3712 | return page + ((addr - page) / Map::kSize * Map::kSize); |
| 3713 | } |
| 3714 | |
| 3715 | |
| 3716 | static bool IteratePointersInDirtyMaps(Address start, |
| 3717 | Address end, |
| 3718 | ObjectSlotCallback copy_object_func) { |
| 3719 | ASSERT(MapStartAlign(start) == start); |
| 3720 | ASSERT(MapEndAlign(end) == end); |
| 3721 | |
| 3722 | Address map_address = start; |
| 3723 | bool pointers_to_new_space_found = false; |
| 3724 | |
| 3725 | while (map_address < end) { |
| 3726 | ASSERT(!Heap::InNewSpace(Memory::Object_at(map_address))); |
| 3727 | ASSERT(Memory::Object_at(map_address)->IsMap()); |
| 3728 | |
| 3729 | Address pointer_fields_start = map_address + Map::kPointerFieldsBeginOffset; |
| 3730 | Address pointer_fields_end = map_address + Map::kPointerFieldsEndOffset; |
| 3731 | |
| 3732 | if (Heap::IteratePointersInDirtyRegion(pointer_fields_start, |
| 3733 | pointer_fields_end, |
| 3734 | copy_object_func)) { |
| 3735 | pointers_to_new_space_found = true; |
| 3736 | } |
| 3737 | |
| 3738 | map_address += Map::kSize; |
| 3739 | } |
| 3740 | |
| 3741 | return pointers_to_new_space_found; |
| 3742 | } |
| 3743 | |
| 3744 | |
| 3745 | bool Heap::IteratePointersInDirtyMapsRegion( |
| 3746 | Address start, |
| 3747 | Address end, |
| 3748 | ObjectSlotCallback copy_object_func) { |
| 3749 | Address map_aligned_start = MapStartAlign(start); |
| 3750 | Address map_aligned_end = MapEndAlign(end); |
| 3751 | |
| 3752 | bool contains_pointers_to_new_space = false; |
| 3753 | |
| 3754 | if (map_aligned_start != start) { |
| 3755 | Address prev_map = map_aligned_start - Map::kSize; |
| 3756 | ASSERT(Memory::Object_at(prev_map)->IsMap()); |
| 3757 | |
| 3758 | Address pointer_fields_start = |
| 3759 | Max(start, prev_map + Map::kPointerFieldsBeginOffset); |
| 3760 | |
| 3761 | Address pointer_fields_end = |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3762 | Min(prev_map + Map::kPointerFieldsEndOffset, end); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3763 | |
| 3764 | contains_pointers_to_new_space = |
| 3765 | IteratePointersInDirtyRegion(pointer_fields_start, |
| 3766 | pointer_fields_end, |
| 3767 | copy_object_func) |
| 3768 | || contains_pointers_to_new_space; |
| 3769 | } |
| 3770 | |
| 3771 | contains_pointers_to_new_space = |
| 3772 | IteratePointersInDirtyMaps(map_aligned_start, |
| 3773 | map_aligned_end, |
| 3774 | copy_object_func) |
| 3775 | || contains_pointers_to_new_space; |
| 3776 | |
| 3777 | if (map_aligned_end != end) { |
| 3778 | ASSERT(Memory::Object_at(map_aligned_end)->IsMap()); |
| 3779 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3780 | Address pointer_fields_start = |
| 3781 | map_aligned_end + Map::kPointerFieldsBeginOffset; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3782 | |
| 3783 | Address pointer_fields_end = |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3784 | Min(end, map_aligned_end + Map::kPointerFieldsEndOffset); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3785 | |
| 3786 | contains_pointers_to_new_space = |
| 3787 | IteratePointersInDirtyRegion(pointer_fields_start, |
| 3788 | pointer_fields_end, |
| 3789 | copy_object_func) |
| 3790 | || contains_pointers_to_new_space; |
| 3791 | } |
| 3792 | |
| 3793 | return contains_pointers_to_new_space; |
| 3794 | } |
| 3795 | |
| 3796 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3797 | void Heap::IterateAndMarkPointersToFromSpace(Address start, |
| 3798 | Address end, |
| 3799 | ObjectSlotCallback callback) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3800 | Address slot_address = start; |
| 3801 | Page* page = Page::FromAddress(start); |
| 3802 | |
| 3803 | uint32_t marks = page->GetRegionMarks(); |
| 3804 | |
| 3805 | while (slot_address < end) { |
| 3806 | Object** slot = reinterpret_cast<Object**>(slot_address); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 3807 | if (Heap::InFromSpace(*slot)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3808 | ASSERT((*slot)->IsHeapObject()); |
| 3809 | callback(reinterpret_cast<HeapObject**>(slot)); |
| 3810 | if (Heap::InNewSpace(*slot)) { |
| 3811 | ASSERT((*slot)->IsHeapObject()); |
| 3812 | marks |= page->GetRegionMaskForAddress(slot_address); |
| 3813 | } |
| 3814 | } |
| 3815 | slot_address += kPointerSize; |
| 3816 | } |
| 3817 | |
| 3818 | page->SetRegionMarks(marks); |
| 3819 | } |
| 3820 | |
| 3821 | |
| 3822 | uint32_t Heap::IterateDirtyRegions( |
| 3823 | uint32_t marks, |
| 3824 | Address area_start, |
| 3825 | Address area_end, |
| 3826 | DirtyRegionCallback visit_dirty_region, |
| 3827 | ObjectSlotCallback copy_object_func) { |
| 3828 | uint32_t newmarks = 0; |
| 3829 | uint32_t mask = 1; |
| 3830 | |
| 3831 | if (area_start >= area_end) { |
| 3832 | return newmarks; |
| 3833 | } |
| 3834 | |
| 3835 | Address region_start = area_start; |
| 3836 | |
| 3837 | // area_start does not necessarily coincide with start of the first region. |
| 3838 | // Thus to calculate the beginning of the next region we have to align |
| 3839 | // area_start by Page::kRegionSize. |
| 3840 | Address second_region = |
| 3841 | reinterpret_cast<Address>( |
| 3842 | reinterpret_cast<intptr_t>(area_start + Page::kRegionSize) & |
| 3843 | ~Page::kRegionAlignmentMask); |
| 3844 | |
| 3845 | // Next region might be beyond area_end. |
| 3846 | Address region_end = Min(second_region, area_end); |
| 3847 | |
| 3848 | if (marks & mask) { |
| 3849 | if (visit_dirty_region(region_start, region_end, copy_object_func)) { |
| 3850 | newmarks |= mask; |
| 3851 | } |
| 3852 | } |
| 3853 | mask <<= 1; |
| 3854 | |
| 3855 | // Iterate subsequent regions which fully lay inside [area_start, area_end[. |
| 3856 | region_start = region_end; |
| 3857 | region_end = region_start + Page::kRegionSize; |
| 3858 | |
| 3859 | while (region_end <= area_end) { |
| 3860 | if (marks & mask) { |
| 3861 | if (visit_dirty_region(region_start, region_end, copy_object_func)) { |
| 3862 | newmarks |= mask; |
| 3863 | } |
| 3864 | } |
| 3865 | |
| 3866 | region_start = region_end; |
| 3867 | region_end = region_start + Page::kRegionSize; |
| 3868 | |
| 3869 | mask <<= 1; |
| 3870 | } |
| 3871 | |
| 3872 | if (region_start != area_end) { |
| 3873 | // A small piece of area left uniterated because area_end does not coincide |
| 3874 | // with region end. Check whether region covering last part of area is |
| 3875 | // dirty. |
| 3876 | if (marks & mask) { |
| 3877 | if (visit_dirty_region(region_start, area_end, copy_object_func)) { |
| 3878 | newmarks |= mask; |
| 3879 | } |
| 3880 | } |
| 3881 | } |
| 3882 | |
| 3883 | return newmarks; |
| 3884 | } |
| 3885 | |
| 3886 | |
| 3887 | |
| 3888 | void Heap::IterateDirtyRegions( |
| 3889 | PagedSpace* space, |
| 3890 | DirtyRegionCallback visit_dirty_region, |
| 3891 | ObjectSlotCallback copy_object_func, |
| 3892 | ExpectedPageWatermarkState expected_page_watermark_state) { |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 3893 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3894 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3895 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3896 | while (it.has_next()) { |
| 3897 | Page* page = it.next(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3898 | uint32_t marks = page->GetRegionMarks(); |
| 3899 | |
| 3900 | if (marks != Page::kAllRegionsCleanMarks) { |
| 3901 | Address start = page->ObjectAreaStart(); |
| 3902 | |
| 3903 | // Do not try to visit pointers beyond page allocation watermark. |
| 3904 | // Page can contain garbage pointers there. |
| 3905 | Address end; |
| 3906 | |
| 3907 | if ((expected_page_watermark_state == WATERMARK_SHOULD_BE_VALID) || |
| 3908 | page->IsWatermarkValid()) { |
| 3909 | end = page->AllocationWatermark(); |
| 3910 | } else { |
| 3911 | end = page->CachedAllocationWatermark(); |
| 3912 | } |
| 3913 | |
| 3914 | ASSERT(space == old_pointer_space_ || |
| 3915 | (space == map_space_ && |
| 3916 | ((page->ObjectAreaStart() - end) % Map::kSize == 0))); |
| 3917 | |
| 3918 | page->SetRegionMarks(IterateDirtyRegions(marks, |
| 3919 | start, |
| 3920 | end, |
| 3921 | visit_dirty_region, |
| 3922 | copy_object_func)); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 3923 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3924 | |
| 3925 | // Mark page watermark as invalid to maintain watermark validity invariant. |
| 3926 | // See Page::FlipMeaningOfInvalidatedWatermarkFlag() for details. |
| 3927 | page->InvalidateWatermark(true); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3928 | } |
| 3929 | } |
| 3930 | |
| 3931 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3932 | void Heap::IterateRoots(ObjectVisitor* v, VisitMode mode) { |
| 3933 | IterateStrongRoots(v, mode); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3934 | IterateWeakRoots(v, mode); |
| 3935 | } |
| 3936 | |
| 3937 | |
| 3938 | void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3939 | v->VisitPointer(reinterpret_cast<Object**>(&roots_[kSymbolTableRootIndex])); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3940 | v->Synchronize("symbol_table"); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 3941 | if (mode != VISIT_ALL_IN_SCAVENGE) { |
| 3942 | // Scavenge collections have special processing for this. |
| 3943 | ExternalStringTable::Iterate(v); |
| 3944 | } |
| 3945 | v->Synchronize("external_string_table"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3946 | } |
| 3947 | |
| 3948 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3949 | void Heap::IterateStrongRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 3950 | v->VisitPointers(&roots_[0], &roots_[kStrongRootListLength]); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3951 | v->Synchronize("strong_root_list"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3952 | |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 3953 | v->VisitPointer(BitCast<Object**>(&hidden_symbol_)); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3954 | v->Synchronize("symbol"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3955 | |
| 3956 | Bootstrapper::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3957 | v->Synchronize("bootstrapper"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3958 | Top::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3959 | v->Synchronize("top"); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3960 | Relocatable::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3961 | v->Synchronize("relocatable"); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 3962 | |
| 3963 | #ifdef ENABLE_DEBUGGER_SUPPORT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3964 | Debug::Iterate(v); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 3965 | #endif |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3966 | v->Synchronize("debug"); |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 3967 | CompilationCache::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3968 | v->Synchronize("compilationcache"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3969 | |
| 3970 | // Iterate over local handles in handle scopes. |
| 3971 | HandleScopeImplementer::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3972 | v->Synchronize("handlescope"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3973 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 3974 | // Iterate over the builtin code objects and code stubs in the |
| 3975 | // heap. Note that it is not necessary to iterate over code objects |
| 3976 | // on scavenge collections. |
| 3977 | if (mode != VISIT_ALL_IN_SCAVENGE) { |
| 3978 | Builtins::IterateBuiltins(v); |
| 3979 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3980 | v->Synchronize("builtins"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3981 | |
| 3982 | // Iterate over global handles. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 3983 | if (mode == VISIT_ONLY_STRONG) { |
| 3984 | GlobalHandles::IterateStrongRoots(v); |
| 3985 | } else { |
| 3986 | GlobalHandles::IterateAllRoots(v); |
| 3987 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3988 | v->Synchronize("globalhandles"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3989 | |
| 3990 | // Iterate over pointers being held by inactive threads. |
| 3991 | ThreadManager::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3992 | v->Synchronize("threadmanager"); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3993 | |
| 3994 | // Iterate over the pointers the Serialization/Deserialization code is |
| 3995 | // holding. |
| 3996 | // During garbage collection this keeps the partial snapshot cache alive. |
| 3997 | // During deserialization of the startup snapshot this creates the partial |
| 3998 | // snapshot cache and deserializes the objects it refers to. During |
| 3999 | // serialization this does nothing, since the partial snapshot cache is |
| 4000 | // empty. However the next thing we do is create the partial snapshot, |
| 4001 | // filling up the partial snapshot cache with objects it needs as we go. |
| 4002 | SerializerDeserializer::Iterate(v); |
| 4003 | // We don't do a v->Synchronize call here, because in debug mode that will |
| 4004 | // output a flag to the snapshot. However at this point the serializer and |
| 4005 | // deserializer are deliberately a little unsynchronized (see above) so the |
| 4006 | // checking of the sync flag in the snapshot would fail. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4007 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4008 | |
| 4009 | |
| 4010 | // Flag is set when the heap has been configured. The heap can be repeatedly |
| 4011 | // configured through the API until it is setup. |
| 4012 | static bool heap_configured = false; |
| 4013 | |
| 4014 | // TODO(1236194): Since the heap size is configurable on the command line |
| 4015 | // and through the API, we should gracefully handle the case that the heap |
| 4016 | // size is not big enough to fit all the initial objects. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4017 | bool Heap::ConfigureHeap(int max_semispace_size, int max_old_gen_size) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4018 | if (HasBeenSetup()) return false; |
| 4019 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4020 | if (max_semispace_size > 0) max_semispace_size_ = max_semispace_size; |
| 4021 | |
| 4022 | if (Snapshot::IsEnabled()) { |
| 4023 | // If we are using a snapshot we always reserve the default amount |
| 4024 | // of memory for each semispace because code in the snapshot has |
| 4025 | // write-barrier code that relies on the size and alignment of new |
| 4026 | // space. We therefore cannot use a larger max semispace size |
| 4027 | // than the default reserved semispace size. |
| 4028 | if (max_semispace_size_ > reserved_semispace_size_) { |
| 4029 | max_semispace_size_ = reserved_semispace_size_; |
| 4030 | } |
| 4031 | } else { |
| 4032 | // If we are not using snapshots we reserve space for the actual |
| 4033 | // max semispace size. |
| 4034 | reserved_semispace_size_ = max_semispace_size_; |
| 4035 | } |
| 4036 | |
| 4037 | if (max_old_gen_size > 0) max_old_generation_size_ = max_old_gen_size; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4038 | |
| 4039 | // The new space size must be a power of two to support single-bit testing |
| 4040 | // for containment. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4041 | max_semispace_size_ = RoundUpToPowerOf2(max_semispace_size_); |
| 4042 | reserved_semispace_size_ = RoundUpToPowerOf2(reserved_semispace_size_); |
| 4043 | initial_semispace_size_ = Min(initial_semispace_size_, max_semispace_size_); |
| 4044 | external_allocation_limit_ = 10 * max_semispace_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4045 | |
| 4046 | // The old generation is paged. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4047 | max_old_generation_size_ = RoundUp(max_old_generation_size_, Page::kPageSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4048 | |
| 4049 | heap_configured = true; |
| 4050 | return true; |
| 4051 | } |
| 4052 | |
| 4053 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4054 | bool Heap::ConfigureHeapDefault() { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4055 | return ConfigureHeap(FLAG_max_new_space_size / 2, FLAG_max_old_space_size); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4056 | } |
| 4057 | |
| 4058 | |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4059 | void Heap::RecordStats(HeapStats* stats, bool take_snapshot) { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4060 | *stats->start_marker = 0xDECADE00; |
| 4061 | *stats->end_marker = 0xDECADE01; |
| 4062 | *stats->new_space_size = new_space_.Size(); |
| 4063 | *stats->new_space_capacity = new_space_.Capacity(); |
| 4064 | *stats->old_pointer_space_size = old_pointer_space_->Size(); |
| 4065 | *stats->old_pointer_space_capacity = old_pointer_space_->Capacity(); |
| 4066 | *stats->old_data_space_size = old_data_space_->Size(); |
| 4067 | *stats->old_data_space_capacity = old_data_space_->Capacity(); |
| 4068 | *stats->code_space_size = code_space_->Size(); |
| 4069 | *stats->code_space_capacity = code_space_->Capacity(); |
| 4070 | *stats->map_space_size = map_space_->Size(); |
| 4071 | *stats->map_space_capacity = map_space_->Capacity(); |
| 4072 | *stats->cell_space_size = cell_space_->Size(); |
| 4073 | *stats->cell_space_capacity = cell_space_->Capacity(); |
| 4074 | *stats->lo_space_size = lo_space_->Size(); |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 4075 | GlobalHandles::RecordStats(stats); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4076 | *stats->memory_allocator_size = MemoryAllocator::Size(); |
| 4077 | *stats->memory_allocator_capacity = |
| 4078 | MemoryAllocator::Size() + MemoryAllocator::Available(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 4079 | *stats->os_error = OS::GetLastError(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4080 | if (take_snapshot) { |
| 4081 | HeapIterator iterator; |
| 4082 | for (HeapObject* obj = iterator.next(); |
| 4083 | obj != NULL; |
| 4084 | obj = iterator.next()) { |
| 4085 | // Note: snapshot won't be precise because IsFreeListNode returns true |
| 4086 | // for any bytearray. |
| 4087 | if (FreeListNode::IsFreeListNode(obj)) continue; |
| 4088 | InstanceType type = obj->map()->instance_type(); |
| 4089 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 4090 | stats->objects_per_type[type]++; |
| 4091 | stats->size_per_type[type] += obj->Size(); |
| 4092 | } |
| 4093 | } |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 4094 | } |
| 4095 | |
| 4096 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4097 | int Heap::PromotedSpaceSize() { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4098 | return old_pointer_space_->Size() |
| 4099 | + old_data_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4100 | + code_space_->Size() |
| 4101 | + map_space_->Size() |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4102 | + cell_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4103 | + lo_space_->Size(); |
| 4104 | } |
| 4105 | |
| 4106 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4107 | int Heap::PromotedExternalMemorySize() { |
| 4108 | if (amount_of_external_allocated_memory_ |
| 4109 | <= amount_of_external_allocated_memory_at_last_global_gc_) return 0; |
| 4110 | return amount_of_external_allocated_memory_ |
| 4111 | - amount_of_external_allocated_memory_at_last_global_gc_; |
| 4112 | } |
| 4113 | |
| 4114 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4115 | bool Heap::Setup(bool create_heap_objects) { |
| 4116 | // Initialize heap spaces and initial maps and objects. Whenever something |
| 4117 | // goes wrong, just return false. The caller should check the results and |
| 4118 | // call Heap::TearDown() to release allocated memory. |
| 4119 | // |
| 4120 | // If the heap is not yet configured (eg, through the API), configure it. |
| 4121 | // Configuration is based on the flags new-space-size (really the semispace |
| 4122 | // size) and old-space-size if set or the initial values of semispace_size_ |
| 4123 | // and old_generation_size_ otherwise. |
| 4124 | if (!heap_configured) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4125 | if (!ConfigureHeapDefault()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4126 | } |
| 4127 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 4128 | ScavengingVisitor::Initialize(); |
| 4129 | NewSpaceScavenger::Initialize(); |
| 4130 | MarkCompactCollector::Initialize(); |
| 4131 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4132 | // Setup memory allocator and reserve a chunk of memory for new |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4133 | // space. The chunk is double the size of the requested reserved |
| 4134 | // new space size to ensure that we can find a pair of semispaces that |
| 4135 | // are contiguous and aligned to their size. |
| 4136 | if (!MemoryAllocator::Setup(MaxReserved())) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4137 | void* chunk = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4138 | MemoryAllocator::ReserveInitialChunk(4 * reserved_semispace_size_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4139 | if (chunk == NULL) return false; |
| 4140 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4141 | // Align the pair of semispaces to their size, which must be a power |
| 4142 | // of 2. |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4143 | Address new_space_start = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4144 | RoundUp(reinterpret_cast<byte*>(chunk), 2 * reserved_semispace_size_); |
| 4145 | if (!new_space_.Setup(new_space_start, 2 * reserved_semispace_size_)) { |
| 4146 | return false; |
| 4147 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4148 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4149 | // Initialize old pointer space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4150 | old_pointer_space_ = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4151 | new OldSpace(max_old_generation_size_, OLD_POINTER_SPACE, NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4152 | if (old_pointer_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4153 | if (!old_pointer_space_->Setup(NULL, 0)) return false; |
| 4154 | |
| 4155 | // Initialize old data space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4156 | old_data_space_ = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4157 | new OldSpace(max_old_generation_size_, OLD_DATA_SPACE, NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4158 | if (old_data_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4159 | if (!old_data_space_->Setup(NULL, 0)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4160 | |
| 4161 | // Initialize the code space, set its maximum capacity to the old |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4162 | // generation size. It needs executable memory. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4163 | // On 64-bit platform(s), we put all code objects in a 2 GB range of |
| 4164 | // virtual address space, so that they can call each other with near calls. |
| 4165 | if (code_range_size_ > 0) { |
| 4166 | if (!CodeRange::Setup(code_range_size_)) { |
| 4167 | return false; |
| 4168 | } |
| 4169 | } |
| 4170 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4171 | code_space_ = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4172 | new OldSpace(max_old_generation_size_, CODE_SPACE, EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4173 | if (code_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4174 | if (!code_space_->Setup(NULL, 0)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4175 | |
| 4176 | // Initialize map space. |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4177 | map_space_ = new MapSpace(FLAG_use_big_map_space |
| 4178 | ? max_old_generation_size_ |
kasperl@chromium.org | eac059f | 2010-01-25 11:02:06 +0000 | [diff] [blame] | 4179 | : MapSpace::kMaxMapPageIndex * Page::kPageSize, |
| 4180 | FLAG_max_map_space_pages, |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4181 | MAP_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4182 | if (map_space_ == NULL) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4183 | if (!map_space_->Setup(NULL, 0)) return false; |
| 4184 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4185 | // Initialize global property cell space. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4186 | cell_space_ = new CellSpace(max_old_generation_size_, CELL_SPACE); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4187 | if (cell_space_ == NULL) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4188 | if (!cell_space_->Setup(NULL, 0)) return false; |
| 4189 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4190 | // The large object code space may contain code or data. We set the memory |
| 4191 | // to be non-executable here for safety, but this means we need to enable it |
| 4192 | // explicitly when allocating large code objects. |
| 4193 | lo_space_ = new LargeObjectSpace(LO_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4194 | if (lo_space_ == NULL) return false; |
| 4195 | if (!lo_space_->Setup()) return false; |
| 4196 | |
| 4197 | if (create_heap_objects) { |
| 4198 | // Create initial maps. |
| 4199 | if (!CreateInitialMaps()) return false; |
| 4200 | if (!CreateApiObjects()) return false; |
| 4201 | |
| 4202 | // Create initial objects |
| 4203 | if (!CreateInitialObjects()) return false; |
| 4204 | } |
| 4205 | |
| 4206 | LOG(IntEvent("heap-capacity", Capacity())); |
| 4207 | LOG(IntEvent("heap-available", Available())); |
| 4208 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4209 | #ifdef ENABLE_LOGGING_AND_PROFILING |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 4210 | // This should be called only after initial objects have been created. |
| 4211 | ProducerHeapProfile::Setup(); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4212 | #endif |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 4213 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4214 | return true; |
| 4215 | } |
| 4216 | |
| 4217 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4218 | void Heap::SetStackLimits() { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 4219 | // On 64 bit machines, pointers are generally out of range of Smis. We write |
| 4220 | // something that looks like an out of range Smi to the GC. |
| 4221 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4222 | // Set up the special root array entries containing the stack limits. |
| 4223 | // 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] | 4224 | roots_[kStackLimitRootIndex] = |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4225 | reinterpret_cast<Object*>( |
| 4226 | (StackGuard::jslimit() & ~kSmiTagMask) | kSmiTag); |
| 4227 | roots_[kRealStackLimitRootIndex] = |
| 4228 | reinterpret_cast<Object*>( |
| 4229 | (StackGuard::real_jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 4230 | } |
| 4231 | |
| 4232 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4233 | void Heap::TearDown() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4234 | if (FLAG_print_cumulative_gc_stat) { |
| 4235 | PrintF("\n\n"); |
| 4236 | PrintF("gc_count=%d ", gc_count_); |
| 4237 | PrintF("mark_sweep_count=%d ", ms_count_); |
| 4238 | PrintF("mark_compact_count=%d ", mc_count_); |
| 4239 | PrintF("max_gc_pause=%d ", GCTracer::get_max_gc_pause()); |
| 4240 | PrintF("min_in_mutator=%d ", GCTracer::get_min_in_mutator()); |
| 4241 | PrintF("max_alive_after_gc=%d ", GCTracer::get_max_alive_after_gc()); |
| 4242 | PrintF("\n\n"); |
| 4243 | } |
| 4244 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4245 | GlobalHandles::TearDown(); |
| 4246 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4247 | ExternalStringTable::TearDown(); |
| 4248 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4249 | new_space_.TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4250 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4251 | if (old_pointer_space_ != NULL) { |
| 4252 | old_pointer_space_->TearDown(); |
| 4253 | delete old_pointer_space_; |
| 4254 | old_pointer_space_ = NULL; |
| 4255 | } |
| 4256 | |
| 4257 | if (old_data_space_ != NULL) { |
| 4258 | old_data_space_->TearDown(); |
| 4259 | delete old_data_space_; |
| 4260 | old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4261 | } |
| 4262 | |
| 4263 | if (code_space_ != NULL) { |
| 4264 | code_space_->TearDown(); |
| 4265 | delete code_space_; |
| 4266 | code_space_ = NULL; |
| 4267 | } |
| 4268 | |
| 4269 | if (map_space_ != NULL) { |
| 4270 | map_space_->TearDown(); |
| 4271 | delete map_space_; |
| 4272 | map_space_ = NULL; |
| 4273 | } |
| 4274 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4275 | if (cell_space_ != NULL) { |
| 4276 | cell_space_->TearDown(); |
| 4277 | delete cell_space_; |
| 4278 | cell_space_ = NULL; |
| 4279 | } |
| 4280 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4281 | if (lo_space_ != NULL) { |
| 4282 | lo_space_->TearDown(); |
| 4283 | delete lo_space_; |
| 4284 | lo_space_ = NULL; |
| 4285 | } |
| 4286 | |
| 4287 | MemoryAllocator::TearDown(); |
| 4288 | } |
| 4289 | |
| 4290 | |
| 4291 | void Heap::Shrink() { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4292 | // Try to shrink all paged spaces. |
| 4293 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4294 | for (PagedSpace* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4295 | space->Shrink(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4296 | } |
| 4297 | |
| 4298 | |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 4299 | #ifdef ENABLE_HEAP_PROTECTION |
| 4300 | |
| 4301 | void Heap::Protect() { |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4302 | if (HasBeenSetup()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4303 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4304 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4305 | space->Protect(); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4306 | } |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 4307 | } |
| 4308 | |
| 4309 | |
| 4310 | void Heap::Unprotect() { |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4311 | if (HasBeenSetup()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4312 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4313 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4314 | space->Unprotect(); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4315 | } |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 4316 | } |
| 4317 | |
| 4318 | #endif |
| 4319 | |
| 4320 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 4321 | void Heap::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) { |
| 4322 | ASSERT(callback != NULL); |
| 4323 | GCPrologueCallbackPair pair(callback, gc_type); |
| 4324 | ASSERT(!gc_prologue_callbacks_.Contains(pair)); |
| 4325 | return gc_prologue_callbacks_.Add(pair); |
| 4326 | } |
| 4327 | |
| 4328 | |
| 4329 | void Heap::RemoveGCPrologueCallback(GCPrologueCallback callback) { |
| 4330 | ASSERT(callback != NULL); |
| 4331 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 4332 | if (gc_prologue_callbacks_[i].callback == callback) { |
| 4333 | gc_prologue_callbacks_.Remove(i); |
| 4334 | return; |
| 4335 | } |
| 4336 | } |
| 4337 | UNREACHABLE(); |
| 4338 | } |
| 4339 | |
| 4340 | |
| 4341 | void Heap::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) { |
| 4342 | ASSERT(callback != NULL); |
| 4343 | GCEpilogueCallbackPair pair(callback, gc_type); |
| 4344 | ASSERT(!gc_epilogue_callbacks_.Contains(pair)); |
| 4345 | return gc_epilogue_callbacks_.Add(pair); |
| 4346 | } |
| 4347 | |
| 4348 | |
| 4349 | void Heap::RemoveGCEpilogueCallback(GCEpilogueCallback callback) { |
| 4350 | ASSERT(callback != NULL); |
| 4351 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 4352 | if (gc_epilogue_callbacks_[i].callback == callback) { |
| 4353 | gc_epilogue_callbacks_.Remove(i); |
| 4354 | return; |
| 4355 | } |
| 4356 | } |
| 4357 | UNREACHABLE(); |
| 4358 | } |
| 4359 | |
| 4360 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4361 | #ifdef DEBUG |
| 4362 | |
| 4363 | class PrintHandleVisitor: public ObjectVisitor { |
| 4364 | public: |
| 4365 | void VisitPointers(Object** start, Object** end) { |
| 4366 | for (Object** p = start; p < end; p++) |
| 4367 | PrintF(" handle %p to %p\n", p, *p); |
| 4368 | } |
| 4369 | }; |
| 4370 | |
| 4371 | void Heap::PrintHandles() { |
| 4372 | PrintF("Handles:\n"); |
| 4373 | PrintHandleVisitor v; |
| 4374 | HandleScopeImplementer::Iterate(&v); |
| 4375 | } |
| 4376 | |
| 4377 | #endif |
| 4378 | |
| 4379 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4380 | Space* AllSpaces::next() { |
| 4381 | switch (counter_++) { |
| 4382 | case NEW_SPACE: |
| 4383 | return Heap::new_space(); |
| 4384 | case OLD_POINTER_SPACE: |
| 4385 | return Heap::old_pointer_space(); |
| 4386 | case OLD_DATA_SPACE: |
| 4387 | return Heap::old_data_space(); |
| 4388 | case CODE_SPACE: |
| 4389 | return Heap::code_space(); |
| 4390 | case MAP_SPACE: |
| 4391 | return Heap::map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4392 | case CELL_SPACE: |
| 4393 | return Heap::cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4394 | case LO_SPACE: |
| 4395 | return Heap::lo_space(); |
| 4396 | default: |
| 4397 | return NULL; |
| 4398 | } |
| 4399 | } |
| 4400 | |
| 4401 | |
| 4402 | PagedSpace* PagedSpaces::next() { |
| 4403 | switch (counter_++) { |
| 4404 | case OLD_POINTER_SPACE: |
| 4405 | return Heap::old_pointer_space(); |
| 4406 | case OLD_DATA_SPACE: |
| 4407 | return Heap::old_data_space(); |
| 4408 | case CODE_SPACE: |
| 4409 | return Heap::code_space(); |
| 4410 | case MAP_SPACE: |
| 4411 | return Heap::map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4412 | case CELL_SPACE: |
| 4413 | return Heap::cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4414 | default: |
| 4415 | return NULL; |
| 4416 | } |
| 4417 | } |
| 4418 | |
| 4419 | |
| 4420 | |
| 4421 | OldSpace* OldSpaces::next() { |
| 4422 | switch (counter_++) { |
| 4423 | case OLD_POINTER_SPACE: |
| 4424 | return Heap::old_pointer_space(); |
| 4425 | case OLD_DATA_SPACE: |
| 4426 | return Heap::old_data_space(); |
| 4427 | case CODE_SPACE: |
| 4428 | return Heap::code_space(); |
| 4429 | default: |
| 4430 | return NULL; |
| 4431 | } |
| 4432 | } |
| 4433 | |
| 4434 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4435 | SpaceIterator::SpaceIterator() : current_space_(FIRST_SPACE), iterator_(NULL) { |
| 4436 | } |
| 4437 | |
| 4438 | |
| 4439 | SpaceIterator::~SpaceIterator() { |
| 4440 | // Delete active iterator if any. |
| 4441 | delete iterator_; |
| 4442 | } |
| 4443 | |
| 4444 | |
| 4445 | bool SpaceIterator::has_next() { |
| 4446 | // Iterate until no more spaces. |
| 4447 | return current_space_ != LAST_SPACE; |
| 4448 | } |
| 4449 | |
| 4450 | |
| 4451 | ObjectIterator* SpaceIterator::next() { |
| 4452 | if (iterator_ != NULL) { |
| 4453 | delete iterator_; |
| 4454 | iterator_ = NULL; |
| 4455 | // Move to the next space |
| 4456 | current_space_++; |
| 4457 | if (current_space_ > LAST_SPACE) { |
| 4458 | return NULL; |
| 4459 | } |
| 4460 | } |
| 4461 | |
| 4462 | // Return iterator for the new current space. |
| 4463 | return CreateIterator(); |
| 4464 | } |
| 4465 | |
| 4466 | |
| 4467 | // Create an iterator for the space to iterate. |
| 4468 | ObjectIterator* SpaceIterator::CreateIterator() { |
| 4469 | ASSERT(iterator_ == NULL); |
| 4470 | |
| 4471 | switch (current_space_) { |
| 4472 | case NEW_SPACE: |
| 4473 | iterator_ = new SemiSpaceIterator(Heap::new_space()); |
| 4474 | break; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4475 | case OLD_POINTER_SPACE: |
| 4476 | iterator_ = new HeapObjectIterator(Heap::old_pointer_space()); |
| 4477 | break; |
| 4478 | case OLD_DATA_SPACE: |
| 4479 | iterator_ = new HeapObjectIterator(Heap::old_data_space()); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4480 | break; |
| 4481 | case CODE_SPACE: |
| 4482 | iterator_ = new HeapObjectIterator(Heap::code_space()); |
| 4483 | break; |
| 4484 | case MAP_SPACE: |
| 4485 | iterator_ = new HeapObjectIterator(Heap::map_space()); |
| 4486 | break; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4487 | case CELL_SPACE: |
| 4488 | iterator_ = new HeapObjectIterator(Heap::cell_space()); |
| 4489 | break; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4490 | case LO_SPACE: |
| 4491 | iterator_ = new LargeObjectIterator(Heap::lo_space()); |
| 4492 | break; |
| 4493 | } |
| 4494 | |
| 4495 | // Return the newly allocated iterator; |
| 4496 | ASSERT(iterator_ != NULL); |
| 4497 | return iterator_; |
| 4498 | } |
| 4499 | |
| 4500 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4501 | HeapIterator::HeapIterator() { |
| 4502 | Init(); |
| 4503 | } |
| 4504 | |
| 4505 | |
| 4506 | HeapIterator::~HeapIterator() { |
| 4507 | Shutdown(); |
| 4508 | } |
| 4509 | |
| 4510 | |
| 4511 | void HeapIterator::Init() { |
| 4512 | // Start the iteration. |
| 4513 | space_iterator_ = new SpaceIterator(); |
| 4514 | object_iterator_ = space_iterator_->next(); |
| 4515 | } |
| 4516 | |
| 4517 | |
| 4518 | void HeapIterator::Shutdown() { |
| 4519 | // Make sure the last iterator is deallocated. |
| 4520 | delete space_iterator_; |
| 4521 | space_iterator_ = NULL; |
| 4522 | object_iterator_ = NULL; |
| 4523 | } |
| 4524 | |
| 4525 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4526 | HeapObject* HeapIterator::next() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4527 | // No iterator means we are done. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4528 | if (object_iterator_ == NULL) return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4529 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4530 | if (HeapObject* obj = object_iterator_->next_object()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4531 | // If the current iterator has more objects we are fine. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4532 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4533 | } else { |
| 4534 | // Go though the spaces looking for one that has objects. |
| 4535 | while (space_iterator_->has_next()) { |
| 4536 | object_iterator_ = space_iterator_->next(); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4537 | if (HeapObject* obj = object_iterator_->next_object()) { |
| 4538 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4539 | } |
| 4540 | } |
| 4541 | } |
| 4542 | // Done with the last space. |
| 4543 | object_iterator_ = NULL; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4544 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4545 | } |
| 4546 | |
| 4547 | |
| 4548 | void HeapIterator::reset() { |
| 4549 | // Restart the iterator. |
| 4550 | Shutdown(); |
| 4551 | Init(); |
| 4552 | } |
| 4553 | |
| 4554 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4555 | #ifdef DEBUG |
| 4556 | |
| 4557 | static bool search_for_any_global; |
| 4558 | static Object* search_target; |
| 4559 | static bool found_target; |
| 4560 | static List<Object*> object_stack(20); |
| 4561 | |
| 4562 | |
| 4563 | // Tags 0, 1, and 3 are used. Use 2 for marking visited HeapObject. |
| 4564 | static const int kMarkTag = 2; |
| 4565 | |
| 4566 | static void MarkObjectRecursively(Object** p); |
| 4567 | class MarkObjectVisitor : public ObjectVisitor { |
| 4568 | public: |
| 4569 | void VisitPointers(Object** start, Object** end) { |
| 4570 | // Copy all HeapObject pointers in [start, end) |
| 4571 | for (Object** p = start; p < end; p++) { |
| 4572 | if ((*p)->IsHeapObject()) |
| 4573 | MarkObjectRecursively(p); |
| 4574 | } |
| 4575 | } |
| 4576 | }; |
| 4577 | |
| 4578 | static MarkObjectVisitor mark_visitor; |
| 4579 | |
| 4580 | static void MarkObjectRecursively(Object** p) { |
| 4581 | if (!(*p)->IsHeapObject()) return; |
| 4582 | |
| 4583 | HeapObject* obj = HeapObject::cast(*p); |
| 4584 | |
| 4585 | Object* map = obj->map(); |
| 4586 | |
| 4587 | if (!map->IsHeapObject()) return; // visited before |
| 4588 | |
| 4589 | if (found_target) return; // stop if target found |
| 4590 | object_stack.Add(obj); |
| 4591 | if ((search_for_any_global && obj->IsJSGlobalObject()) || |
| 4592 | (!search_for_any_global && (obj == search_target))) { |
| 4593 | found_target = true; |
| 4594 | return; |
| 4595 | } |
| 4596 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4597 | // not visited yet |
| 4598 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 4599 | |
| 4600 | Address map_addr = map_p->address(); |
| 4601 | |
| 4602 | obj->set_map(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
| 4603 | |
| 4604 | MarkObjectRecursively(&map); |
| 4605 | |
| 4606 | obj->IterateBody(map_p->instance_type(), obj->SizeFromMap(map_p), |
| 4607 | &mark_visitor); |
| 4608 | |
| 4609 | if (!found_target) // don't pop if found the target |
| 4610 | object_stack.RemoveLast(); |
| 4611 | } |
| 4612 | |
| 4613 | |
| 4614 | static void UnmarkObjectRecursively(Object** p); |
| 4615 | class UnmarkObjectVisitor : public ObjectVisitor { |
| 4616 | public: |
| 4617 | void VisitPointers(Object** start, Object** end) { |
| 4618 | // Copy all HeapObject pointers in [start, end) |
| 4619 | for (Object** p = start; p < end; p++) { |
| 4620 | if ((*p)->IsHeapObject()) |
| 4621 | UnmarkObjectRecursively(p); |
| 4622 | } |
| 4623 | } |
| 4624 | }; |
| 4625 | |
| 4626 | static UnmarkObjectVisitor unmark_visitor; |
| 4627 | |
| 4628 | static void UnmarkObjectRecursively(Object** p) { |
| 4629 | if (!(*p)->IsHeapObject()) return; |
| 4630 | |
| 4631 | HeapObject* obj = HeapObject::cast(*p); |
| 4632 | |
| 4633 | Object* map = obj->map(); |
| 4634 | |
| 4635 | if (map->IsHeapObject()) return; // unmarked already |
| 4636 | |
| 4637 | Address map_addr = reinterpret_cast<Address>(map); |
| 4638 | |
| 4639 | map_addr -= kMarkTag; |
| 4640 | |
| 4641 | ASSERT_TAG_ALIGNED(map_addr); |
| 4642 | |
| 4643 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 4644 | |
| 4645 | obj->set_map(reinterpret_cast<Map*>(map_p)); |
| 4646 | |
| 4647 | UnmarkObjectRecursively(reinterpret_cast<Object**>(&map_p)); |
| 4648 | |
| 4649 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 4650 | obj->SizeFromMap(Map::cast(map_p)), |
| 4651 | &unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4652 | } |
| 4653 | |
| 4654 | |
| 4655 | static void MarkRootObjectRecursively(Object** root) { |
| 4656 | if (search_for_any_global) { |
| 4657 | ASSERT(search_target == NULL); |
| 4658 | } else { |
| 4659 | ASSERT(search_target->IsHeapObject()); |
| 4660 | } |
| 4661 | found_target = false; |
| 4662 | object_stack.Clear(); |
| 4663 | |
| 4664 | MarkObjectRecursively(root); |
| 4665 | UnmarkObjectRecursively(root); |
| 4666 | |
| 4667 | if (found_target) { |
| 4668 | PrintF("=====================================\n"); |
| 4669 | PrintF("==== Path to object ====\n"); |
| 4670 | PrintF("=====================================\n\n"); |
| 4671 | |
| 4672 | ASSERT(!object_stack.is_empty()); |
| 4673 | for (int i = 0; i < object_stack.length(); i++) { |
| 4674 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
| 4675 | Object* obj = object_stack[i]; |
| 4676 | obj->Print(); |
| 4677 | } |
| 4678 | PrintF("=====================================\n"); |
| 4679 | } |
| 4680 | } |
| 4681 | |
| 4682 | |
| 4683 | // Helper class for visiting HeapObjects recursively. |
| 4684 | class MarkRootVisitor: public ObjectVisitor { |
| 4685 | public: |
| 4686 | void VisitPointers(Object** start, Object** end) { |
| 4687 | // Visit all HeapObject pointers in [start, end) |
| 4688 | for (Object** p = start; p < end; p++) { |
| 4689 | if ((*p)->IsHeapObject()) |
| 4690 | MarkRootObjectRecursively(p); |
| 4691 | } |
| 4692 | } |
| 4693 | }; |
| 4694 | |
| 4695 | |
| 4696 | // Triggers a depth-first traversal of reachable objects from roots |
| 4697 | // 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] | 4698 | void Heap::TracePathToObject(Object* target) { |
| 4699 | search_target = target; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4700 | search_for_any_global = false; |
| 4701 | |
| 4702 | MarkRootVisitor root_visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4703 | IterateRoots(&root_visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4704 | } |
| 4705 | |
| 4706 | |
| 4707 | // Triggers a depth-first traversal of reachable objects from roots |
| 4708 | // and finds a path to any global object and prints it. Useful for |
| 4709 | // determining the source for leaks of global objects. |
| 4710 | void Heap::TracePathToGlobal() { |
| 4711 | search_target = NULL; |
| 4712 | search_for_any_global = true; |
| 4713 | |
| 4714 | MarkRootVisitor root_visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4715 | IterateRoots(&root_visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4716 | } |
| 4717 | #endif |
| 4718 | |
| 4719 | |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4720 | static int CountTotalHolesSize() { |
| 4721 | int holes_size = 0; |
| 4722 | OldSpaces spaces; |
| 4723 | for (OldSpace* space = spaces.next(); |
| 4724 | space != NULL; |
| 4725 | space = spaces.next()) { |
| 4726 | holes_size += space->Waste() + space->AvailableFree(); |
| 4727 | } |
| 4728 | return holes_size; |
| 4729 | } |
| 4730 | |
| 4731 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4732 | GCTracer::GCTracer() |
| 4733 | : start_time_(0.0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4734 | start_size_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4735 | gc_count_(0), |
| 4736 | full_gc_count_(0), |
| 4737 | is_compacting_(false), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4738 | marked_count_(0), |
| 4739 | allocated_since_last_gc_(0), |
| 4740 | spent_in_mutator_(0), |
| 4741 | promoted_objects_size_(0) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4742 | // These two fields reflect the state of the previous full collection. |
| 4743 | // Set them before they are changed by the collector. |
| 4744 | previous_has_compacted_ = MarkCompactCollector::HasCompacted(); |
| 4745 | previous_marked_count_ = MarkCompactCollector::previous_marked_count(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4746 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4747 | start_time_ = OS::TimeCurrentMillis(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4748 | start_size_ = Heap::SizeOfObjects(); |
| 4749 | |
| 4750 | for (int i = 0; i < Scope::kNumberOfScopes; i++) { |
| 4751 | scopes_[i] = 0; |
| 4752 | } |
| 4753 | |
| 4754 | in_free_list_or_wasted_before_gc_ = CountTotalHolesSize(); |
| 4755 | |
| 4756 | allocated_since_last_gc_ = Heap::SizeOfObjects() - alive_after_last_gc_; |
| 4757 | |
| 4758 | if (last_gc_end_timestamp_ > 0) { |
| 4759 | spent_in_mutator_ = Max(start_time_ - last_gc_end_timestamp_, 0.0); |
| 4760 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4761 | } |
| 4762 | |
| 4763 | |
| 4764 | GCTracer::~GCTracer() { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4765 | // Printf ONE line iff flag is set. |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4766 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
| 4767 | |
| 4768 | bool first_gc = (last_gc_end_timestamp_ == 0); |
| 4769 | |
| 4770 | alive_after_last_gc_ = Heap::SizeOfObjects(); |
| 4771 | last_gc_end_timestamp_ = OS::TimeCurrentMillis(); |
| 4772 | |
| 4773 | int time = static_cast<int>(last_gc_end_timestamp_ - start_time_); |
| 4774 | |
| 4775 | // Update cumulative GC statistics if required. |
| 4776 | if (FLAG_print_cumulative_gc_stat) { |
| 4777 | max_gc_pause_ = Max(max_gc_pause_, time); |
| 4778 | max_alive_after_gc_ = Max(max_alive_after_gc_, alive_after_last_gc_); |
| 4779 | if (!first_gc) { |
| 4780 | min_in_mutator_ = Min(min_in_mutator_, |
| 4781 | static_cast<int>(spent_in_mutator_)); |
| 4782 | } |
| 4783 | } |
| 4784 | |
| 4785 | if (!FLAG_trace_gc_nvp) { |
| 4786 | int external_time = static_cast<int>(scopes_[Scope::EXTERNAL]); |
| 4787 | |
| 4788 | PrintF("%s %.1f -> %.1f MB, ", |
| 4789 | CollectorString(), |
| 4790 | static_cast<double>(start_size_) / MB, |
| 4791 | SizeOfHeapObjects()); |
| 4792 | |
| 4793 | if (external_time > 0) PrintF("%d / ", external_time); |
| 4794 | PrintF("%d ms.\n", time); |
| 4795 | } else { |
| 4796 | PrintF("pause=%d ", time); |
| 4797 | PrintF("mutator=%d ", |
| 4798 | static_cast<int>(spent_in_mutator_)); |
| 4799 | |
| 4800 | PrintF("gc="); |
| 4801 | switch (collector_) { |
| 4802 | case SCAVENGER: |
| 4803 | PrintF("s"); |
| 4804 | break; |
| 4805 | case MARK_COMPACTOR: |
| 4806 | PrintF(MarkCompactCollector::HasCompacted() ? "mc" : "ms"); |
| 4807 | break; |
| 4808 | default: |
| 4809 | UNREACHABLE(); |
| 4810 | } |
| 4811 | PrintF(" "); |
| 4812 | |
| 4813 | PrintF("external=%d ", static_cast<int>(scopes_[Scope::EXTERNAL])); |
| 4814 | PrintF("mark=%d ", static_cast<int>(scopes_[Scope::MC_MARK])); |
| 4815 | PrintF("sweep=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP])); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame^] | 4816 | 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] | 4817 | PrintF("compact=%d ", static_cast<int>(scopes_[Scope::MC_COMPACT])); |
fschneider@chromium.org | ed78ffd | 2010-07-21 11:05:19 +0000 | [diff] [blame] | 4818 | PrintF("flushcode=%d ", static_cast<int>(scopes_[Scope::MC_FLUSH_CODE])); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4819 | |
| 4820 | PrintF("total_size_before=%d ", start_size_); |
| 4821 | PrintF("total_size_after=%d ", Heap::SizeOfObjects()); |
| 4822 | PrintF("holes_size_before=%d ", in_free_list_or_wasted_before_gc_); |
| 4823 | PrintF("holes_size_after=%d ", CountTotalHolesSize()); |
| 4824 | |
| 4825 | PrintF("allocated=%d ", allocated_since_last_gc_); |
| 4826 | PrintF("promoted=%d ", promoted_objects_size_); |
| 4827 | |
| 4828 | PrintF("\n"); |
| 4829 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 4830 | |
| 4831 | #if defined(ENABLE_LOGGING_AND_PROFILING) |
| 4832 | Heap::PrintShortHeapStatistics(); |
| 4833 | #endif |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4834 | } |
| 4835 | |
| 4836 | |
| 4837 | const char* GCTracer::CollectorString() { |
| 4838 | switch (collector_) { |
| 4839 | case SCAVENGER: |
| 4840 | return "Scavenge"; |
| 4841 | case MARK_COMPACTOR: |
| 4842 | return MarkCompactCollector::HasCompacted() ? "Mark-compact" |
| 4843 | : "Mark-sweep"; |
| 4844 | } |
| 4845 | return "Unknown GC"; |
| 4846 | } |
| 4847 | |
| 4848 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4849 | int KeyedLookupCache::Hash(Map* map, String* name) { |
| 4850 | // Uses only lower 32 bits if pointers are larger. |
| 4851 | uintptr_t addr_hash = |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4852 | static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> kMapHashShift; |
fschneider@chromium.org | b95b98b | 2010-02-23 10:34:29 +0000 | [diff] [blame] | 4853 | return static_cast<uint32_t>((addr_hash ^ name->Hash()) & kCapacityMask); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 4854 | } |
| 4855 | |
| 4856 | |
| 4857 | int KeyedLookupCache::Lookup(Map* map, String* name) { |
| 4858 | int index = Hash(map, name); |
| 4859 | Key& key = keys_[index]; |
| 4860 | if ((key.map == map) && key.name->Equals(name)) { |
| 4861 | return field_offsets_[index]; |
| 4862 | } |
| 4863 | return -1; |
| 4864 | } |
| 4865 | |
| 4866 | |
| 4867 | void KeyedLookupCache::Update(Map* map, String* name, int field_offset) { |
| 4868 | String* symbol; |
| 4869 | if (Heap::LookupSymbolIfExists(name, &symbol)) { |
| 4870 | int index = Hash(map, symbol); |
| 4871 | Key& key = keys_[index]; |
| 4872 | key.map = map; |
| 4873 | key.name = symbol; |
| 4874 | field_offsets_[index] = field_offset; |
| 4875 | } |
| 4876 | } |
| 4877 | |
| 4878 | |
| 4879 | void KeyedLookupCache::Clear() { |
| 4880 | for (int index = 0; index < kLength; index++) keys_[index].map = NULL; |
| 4881 | } |
| 4882 | |
| 4883 | |
| 4884 | KeyedLookupCache::Key KeyedLookupCache::keys_[KeyedLookupCache::kLength]; |
| 4885 | |
| 4886 | |
| 4887 | int KeyedLookupCache::field_offsets_[KeyedLookupCache::kLength]; |
| 4888 | |
| 4889 | |
| 4890 | void DescriptorLookupCache::Clear() { |
| 4891 | for (int index = 0; index < kLength; index++) keys_[index].array = NULL; |
| 4892 | } |
| 4893 | |
| 4894 | |
| 4895 | DescriptorLookupCache::Key |
| 4896 | DescriptorLookupCache::keys_[DescriptorLookupCache::kLength]; |
| 4897 | |
| 4898 | int DescriptorLookupCache::results_[DescriptorLookupCache::kLength]; |
| 4899 | |
| 4900 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4901 | #ifdef DEBUG |
| 4902 | bool Heap::GarbageCollectionGreedyCheck() { |
| 4903 | ASSERT(FLAG_gc_greedy); |
| 4904 | if (Bootstrapper::IsActive()) return true; |
| 4905 | if (disallow_allocation_failure()) return true; |
| 4906 | return CollectGarbage(0, NEW_SPACE); |
| 4907 | } |
| 4908 | #endif |
| 4909 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 4910 | |
| 4911 | TranscendentalCache::TranscendentalCache(TranscendentalCache::Type t) |
| 4912 | : type_(t) { |
| 4913 | uint32_t in0 = 0xffffffffu; // Bit-pattern for a NaN that isn't |
| 4914 | uint32_t in1 = 0xffffffffu; // generated by the FPU. |
| 4915 | for (int i = 0; i < kCacheSize; i++) { |
| 4916 | elements_[i].in[0] = in0; |
| 4917 | elements_[i].in[1] = in1; |
| 4918 | elements_[i].output = NULL; |
| 4919 | } |
| 4920 | } |
| 4921 | |
| 4922 | |
| 4923 | TranscendentalCache* TranscendentalCache::caches_[kNumberOfCaches]; |
| 4924 | |
| 4925 | |
| 4926 | void TranscendentalCache::Clear() { |
| 4927 | for (int i = 0; i < kNumberOfCaches; i++) { |
| 4928 | if (caches_[i] != NULL) { |
| 4929 | delete caches_[i]; |
| 4930 | caches_[i] = NULL; |
| 4931 | } |
| 4932 | } |
| 4933 | } |
| 4934 | |
| 4935 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4936 | void ExternalStringTable::CleanUp() { |
| 4937 | int last = 0; |
| 4938 | for (int i = 0; i < new_space_strings_.length(); ++i) { |
| 4939 | if (new_space_strings_[i] == Heap::raw_unchecked_null_value()) continue; |
| 4940 | if (Heap::InNewSpace(new_space_strings_[i])) { |
| 4941 | new_space_strings_[last++] = new_space_strings_[i]; |
| 4942 | } else { |
| 4943 | old_space_strings_.Add(new_space_strings_[i]); |
| 4944 | } |
| 4945 | } |
| 4946 | new_space_strings_.Rewind(last); |
| 4947 | last = 0; |
| 4948 | for (int i = 0; i < old_space_strings_.length(); ++i) { |
| 4949 | if (old_space_strings_[i] == Heap::raw_unchecked_null_value()) continue; |
| 4950 | ASSERT(!Heap::InNewSpace(old_space_strings_[i])); |
| 4951 | old_space_strings_[last++] = old_space_strings_[i]; |
| 4952 | } |
| 4953 | old_space_strings_.Rewind(last); |
| 4954 | Verify(); |
| 4955 | } |
| 4956 | |
| 4957 | |
| 4958 | void ExternalStringTable::TearDown() { |
| 4959 | new_space_strings_.Free(); |
| 4960 | old_space_strings_.Free(); |
| 4961 | } |
| 4962 | |
| 4963 | |
| 4964 | List<Object*> ExternalStringTable::new_space_strings_; |
| 4965 | List<Object*> ExternalStringTable::old_space_strings_; |
| 4966 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4967 | } } // namespace v8::internal |