erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 1 | // Copyright 2010 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" |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 38 | #include "liveobjectlist-inl.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 39 | #include "mark-compact.h" |
| 40 | #include "natives.h" |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 41 | #include "objects-visiting.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 42 | #include "runtime-profiler.h" |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 43 | #include "scanner-base.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 44 | #include "scopeinfo.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 45 | #include "snapshot.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 46 | #include "v8threads.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 47 | #include "vm-state-inl.h" |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 48 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 49 | #include "regexp-macro-assembler.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 50 | #include "arm/regexp-macro-assembler-arm.h" |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 51 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 52 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 53 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 54 | namespace v8 { |
| 55 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 56 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 57 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 58 | String* Heap::hidden_symbol_; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 59 | Object* Heap::roots_[Heap::kRootListLength]; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 60 | Object* Heap::global_contexts_list_; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 61 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 62 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 63 | NewSpace Heap::new_space_; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 64 | OldSpace* Heap::old_pointer_space_ = NULL; |
| 65 | OldSpace* Heap::old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 66 | OldSpace* Heap::code_space_ = NULL; |
| 67 | MapSpace* Heap::map_space_ = NULL; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 68 | CellSpace* Heap::cell_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 69 | LargeObjectSpace* Heap::lo_space_ = NULL; |
| 70 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 71 | static const intptr_t kMinimumPromotionLimit = 2 * MB; |
| 72 | static const intptr_t kMinimumAllocationLimit = 8 * MB; |
| 73 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 74 | intptr_t Heap::old_gen_promotion_limit_ = kMinimumPromotionLimit; |
| 75 | intptr_t Heap::old_gen_allocation_limit_ = kMinimumAllocationLimit; |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 76 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 77 | int Heap::old_gen_exhausted_ = false; |
| 78 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 79 | int Heap::amount_of_external_allocated_memory_ = 0; |
| 80 | int Heap::amount_of_external_allocated_memory_at_last_global_gc_ = 0; |
| 81 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 82 | // semispace_size_ should be a power of 2 and old_generation_size_ should be |
| 83 | // a multiple of Page::kPageSize. |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 84 | #if defined(ANDROID) |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 85 | static const int default_max_semispace_size_ = 2*MB; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 86 | intptr_t Heap::max_old_generation_size_ = 192*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 87 | int Heap::initial_semispace_size_ = 128*KB; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 88 | intptr_t Heap::code_range_size_ = 0; |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 89 | intptr_t Heap::max_executable_size_ = max_old_generation_size_; |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 90 | #elif defined(V8_TARGET_ARCH_X64) |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 91 | static const int default_max_semispace_size_ = 16*MB; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 92 | intptr_t Heap::max_old_generation_size_ = 1*GB; |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 93 | int Heap::initial_semispace_size_ = 1*MB; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 94 | intptr_t Heap::code_range_size_ = 512*MB; |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 95 | intptr_t Heap::max_executable_size_ = 256*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 96 | #else |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 97 | static const int default_max_semispace_size_ = 8*MB; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 98 | intptr_t Heap::max_old_generation_size_ = 512*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 99 | int Heap::initial_semispace_size_ = 512*KB; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 100 | intptr_t Heap::code_range_size_ = 0; |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 101 | intptr_t Heap::max_executable_size_ = 128*MB; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 102 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 103 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 104 | // Allow build-time customization of the max semispace size. Building |
| 105 | // V8 with snapshots and a non-default max semispace size is much |
| 106 | // easier if you can define it as part of the build environment. |
| 107 | #if defined(V8_MAX_SEMISPACE_SIZE) |
| 108 | int Heap::max_semispace_size_ = V8_MAX_SEMISPACE_SIZE; |
| 109 | #else |
| 110 | int Heap::max_semispace_size_ = default_max_semispace_size_; |
| 111 | #endif |
| 112 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 113 | // The snapshot semispace size will be the default semispace size if |
| 114 | // snapshotting is used and will be the requested semispace size as |
| 115 | // set up by ConfigureHeap otherwise. |
| 116 | int Heap::reserved_semispace_size_ = Heap::max_semispace_size_; |
| 117 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 118 | List<Heap::GCPrologueCallbackPair> Heap::gc_prologue_callbacks_; |
| 119 | List<Heap::GCEpilogueCallbackPair> Heap::gc_epilogue_callbacks_; |
| 120 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 121 | GCCallback Heap::global_gc_prologue_callback_ = NULL; |
| 122 | GCCallback Heap::global_gc_epilogue_callback_ = NULL; |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 123 | HeapObjectCallback Heap::gc_safe_size_of_old_object_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 124 | |
| 125 | // Variables set based on semispace_size_ and old_generation_size_ in |
| 126 | // ConfigureHeap. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 127 | |
| 128 | // Will be 4 * reserved_semispace_size_ to ensure that young |
| 129 | // generation can be aligned to its size. |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 130 | int Heap::survived_since_last_expansion_ = 0; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 131 | intptr_t Heap::external_allocation_limit_ = 0; |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 132 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 133 | Heap::HeapState Heap::gc_state_ = NOT_IN_GC; |
| 134 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 135 | int Heap::mc_count_ = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 136 | int Heap::ms_count_ = 0; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 137 | unsigned int Heap::gc_count_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 138 | |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 139 | GCTracer* Heap::tracer_ = NULL; |
| 140 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 141 | int Heap::unflattened_strings_length_ = 0; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 142 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 143 | int Heap::always_allocate_scope_depth_ = 0; |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 144 | int Heap::linear_allocation_scope_depth_ = 0; |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 145 | int Heap::contexts_disposed_ = 0; |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 146 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 147 | int Heap::young_survivors_after_last_gc_ = 0; |
| 148 | int Heap::high_survival_rate_period_length_ = 0; |
| 149 | double Heap::survival_rate_ = 0; |
| 150 | Heap::SurvivalRateTrend Heap::previous_survival_rate_trend_ = Heap::STABLE; |
| 151 | Heap::SurvivalRateTrend Heap::survival_rate_trend_ = Heap::STABLE; |
| 152 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 153 | #ifdef DEBUG |
| 154 | bool Heap::allocation_allowed_ = true; |
| 155 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 156 | int Heap::allocation_timeout_ = 0; |
| 157 | bool Heap::disallow_allocation_failure_ = false; |
| 158 | #endif // DEBUG |
| 159 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 160 | intptr_t GCTracer::alive_after_last_gc_ = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 161 | double GCTracer::last_gc_end_timestamp_ = 0.0; |
| 162 | int GCTracer::max_gc_pause_ = 0; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 163 | intptr_t GCTracer::max_alive_after_gc_ = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 164 | int GCTracer::min_in_mutator_ = kMaxInt; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 165 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 166 | intptr_t Heap::Capacity() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 167 | if (!HasBeenSetup()) return 0; |
| 168 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 169 | return new_space_.Capacity() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 170 | old_pointer_space_->Capacity() + |
| 171 | old_data_space_->Capacity() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 172 | code_space_->Capacity() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 173 | map_space_->Capacity() + |
| 174 | cell_space_->Capacity(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 178 | intptr_t Heap::CommittedMemory() { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 179 | if (!HasBeenSetup()) return 0; |
| 180 | |
| 181 | return new_space_.CommittedMemory() + |
| 182 | old_pointer_space_->CommittedMemory() + |
| 183 | old_data_space_->CommittedMemory() + |
| 184 | code_space_->CommittedMemory() + |
| 185 | map_space_->CommittedMemory() + |
| 186 | cell_space_->CommittedMemory() + |
| 187 | lo_space_->Size(); |
| 188 | } |
| 189 | |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 190 | intptr_t Heap::CommittedMemoryExecutable() { |
| 191 | if (!HasBeenSetup()) return 0; |
| 192 | |
| 193 | return MemoryAllocator::SizeExecutable(); |
| 194 | } |
| 195 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 196 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 197 | intptr_t Heap::Available() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 198 | if (!HasBeenSetup()) return 0; |
| 199 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 200 | return new_space_.Available() + |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 201 | old_pointer_space_->Available() + |
| 202 | old_data_space_->Available() + |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 203 | code_space_->Available() + |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 204 | map_space_->Available() + |
| 205 | cell_space_->Available(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | |
| 209 | bool Heap::HasBeenSetup() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 210 | return old_pointer_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 211 | old_data_space_ != NULL && |
| 212 | code_space_ != NULL && |
| 213 | map_space_ != NULL && |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 214 | cell_space_ != NULL && |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 215 | lo_space_ != NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 219 | int Heap::GcSafeSizeOfOldObject(HeapObject* object) { |
| 220 | ASSERT(!Heap::InNewSpace(object)); // Code only works for old objects. |
| 221 | ASSERT(!MarkCompactCollector::are_map_pointers_encoded()); |
| 222 | MapWord map_word = object->map_word(); |
| 223 | map_word.ClearMark(); |
| 224 | map_word.ClearOverflow(); |
| 225 | return object->SizeFromMap(map_word.ToMap()); |
| 226 | } |
| 227 | |
| 228 | |
| 229 | int Heap::GcSafeSizeOfOldObjectWithEncodedMap(HeapObject* object) { |
| 230 | ASSERT(!Heap::InNewSpace(object)); // Code only works for old objects. |
| 231 | ASSERT(MarkCompactCollector::are_map_pointers_encoded()); |
| 232 | uint32_t marker = Memory::uint32_at(object->address()); |
| 233 | if (marker == MarkCompactCollector::kSingleFreeEncoding) { |
| 234 | return kIntSize; |
| 235 | } else if (marker == MarkCompactCollector::kMultiFreeEncoding) { |
| 236 | return Memory::int_at(object->address() + kIntSize); |
| 237 | } else { |
| 238 | MapWord map_word = object->map_word(); |
| 239 | Address map_address = map_word.DecodeMapAddress(Heap::map_space()); |
| 240 | Map* map = reinterpret_cast<Map*>(HeapObject::FromAddress(map_address)); |
| 241 | return object->SizeFromMap(map); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 246 | GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space) { |
| 247 | // Is global GC requested? |
| 248 | if (space != NEW_SPACE || FLAG_gc_global) { |
| 249 | Counters::gc_compactor_caused_by_request.Increment(); |
| 250 | return MARK_COMPACTOR; |
| 251 | } |
| 252 | |
| 253 | // Is enough data promoted to justify a global GC? |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 254 | if (OldGenerationPromotionLimitReached()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 255 | Counters::gc_compactor_caused_by_promoted_data.Increment(); |
| 256 | return MARK_COMPACTOR; |
| 257 | } |
| 258 | |
| 259 | // Have allocation in OLD and LO failed? |
| 260 | if (old_gen_exhausted_) { |
| 261 | Counters::gc_compactor_caused_by_oldspace_exhaustion.Increment(); |
| 262 | return MARK_COMPACTOR; |
| 263 | } |
| 264 | |
| 265 | // Is there enough space left in OLD to guarantee that a scavenge can |
| 266 | // succeed? |
| 267 | // |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 268 | // Note that MemoryAllocator->MaxAvailable() undercounts the memory available |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 269 | // for object promotion. It counts only the bytes that the memory |
| 270 | // allocator has not yet allocated from the OS and assigned to any space, |
| 271 | // and does not count available bytes already in the old space or code |
| 272 | // space. Undercounting is safe---we may get an unrequested full GC when |
| 273 | // a scavenge would have succeeded. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 274 | if (MemoryAllocator::MaxAvailable() <= new_space_.Size()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 275 | Counters::gc_compactor_caused_by_oldspace_exhaustion.Increment(); |
| 276 | return MARK_COMPACTOR; |
| 277 | } |
| 278 | |
| 279 | // Default |
| 280 | return SCAVENGER; |
| 281 | } |
| 282 | |
| 283 | |
| 284 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 285 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 286 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 287 | void Heap::ReportStatisticsBeforeGC() { |
| 288 | // Heap::ReportHeapStatistics will also log NewSpace statistics when |
| 289 | // compiled with ENABLE_LOGGING_AND_PROFILING and --log-gc is set. The |
| 290 | // following logic is used to avoid double logging. |
| 291 | #if defined(DEBUG) && defined(ENABLE_LOGGING_AND_PROFILING) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 292 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 293 | if (FLAG_heap_stats) { |
| 294 | ReportHeapStatistics("Before GC"); |
| 295 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 296 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 297 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 298 | if (FLAG_heap_stats || FLAG_log_gc) new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 299 | #elif defined(DEBUG) |
| 300 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 301 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 302 | ReportHeapStatistics("Before GC"); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 303 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 304 | } |
| 305 | #elif defined(ENABLE_LOGGING_AND_PROFILING) |
| 306 | if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 307 | new_space_.CollectStatistics(); |
| 308 | new_space_.ReportStatistics(); |
| 309 | new_space_.ClearHistograms(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 310 | } |
| 311 | #endif |
| 312 | } |
| 313 | |
| 314 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 315 | #if defined(ENABLE_LOGGING_AND_PROFILING) |
| 316 | void Heap::PrintShortHeapStatistics() { |
| 317 | if (!FLAG_trace_gc_verbose) return; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 318 | PrintF("Memory allocator, used: %8" V8_PTR_PREFIX "d" |
| 319 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 320 | MemoryAllocator::Size(), |
| 321 | MemoryAllocator::Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 322 | PrintF("New space, used: %8" V8_PTR_PREFIX "d" |
| 323 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 324 | Heap::new_space_.Size(), |
| 325 | new_space_.Available()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 326 | PrintF("Old pointers, used: %8" V8_PTR_PREFIX "d" |
| 327 | ", available: %8" V8_PTR_PREFIX "d" |
| 328 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 329 | old_pointer_space_->Size(), |
| 330 | old_pointer_space_->Available(), |
| 331 | old_pointer_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 332 | PrintF("Old data space, used: %8" V8_PTR_PREFIX "d" |
| 333 | ", available: %8" V8_PTR_PREFIX "d" |
| 334 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 335 | old_data_space_->Size(), |
| 336 | old_data_space_->Available(), |
| 337 | old_data_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 338 | PrintF("Code space, used: %8" V8_PTR_PREFIX "d" |
| 339 | ", available: %8" V8_PTR_PREFIX "d" |
| 340 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 341 | code_space_->Size(), |
| 342 | code_space_->Available(), |
| 343 | code_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 344 | PrintF("Map space, used: %8" V8_PTR_PREFIX "d" |
| 345 | ", available: %8" V8_PTR_PREFIX "d" |
| 346 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 347 | map_space_->Size(), |
| 348 | map_space_->Available(), |
| 349 | map_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 350 | PrintF("Cell space, used: %8" V8_PTR_PREFIX "d" |
| 351 | ", available: %8" V8_PTR_PREFIX "d" |
| 352 | ", waste: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 353 | cell_space_->Size(), |
| 354 | cell_space_->Available(), |
| 355 | cell_space_->Waste()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 356 | PrintF("Large object space, used: %8" V8_PTR_PREFIX "d" |
| 357 | ", available: %8" V8_PTR_PREFIX "d\n", |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 358 | lo_space_->Size(), |
| 359 | lo_space_->Available()); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 360 | } |
| 361 | #endif |
| 362 | |
| 363 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 364 | // TODO(1238405): Combine the infrastructure for --heap-stats and |
| 365 | // --log-gc to avoid the complicated preprocessor and flag testing. |
| 366 | void Heap::ReportStatisticsAfterGC() { |
| 367 | // Similar to the before GC, we use some complicated logic to ensure that |
| 368 | // NewSpace statistics are logged exactly once when --log-gc is turned on. |
| 369 | #if defined(DEBUG) && defined(ENABLE_LOGGING_AND_PROFILING) |
| 370 | if (FLAG_heap_stats) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 371 | new_space_.CollectStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 372 | ReportHeapStatistics("After GC"); |
| 373 | } else if (FLAG_log_gc) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 374 | new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 375 | } |
| 376 | #elif defined(DEBUG) |
| 377 | if (FLAG_heap_stats) ReportHeapStatistics("After GC"); |
| 378 | #elif defined(ENABLE_LOGGING_AND_PROFILING) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 379 | if (FLAG_log_gc) new_space_.ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 380 | #endif |
| 381 | } |
| 382 | #endif // defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 383 | |
| 384 | |
| 385 | void Heap::GarbageCollectionPrologue() { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 386 | TranscendentalCache::Clear(); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 387 | ClearJSFunctionResultCaches(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 388 | gc_count_++; |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 389 | unflattened_strings_length_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 390 | #ifdef DEBUG |
| 391 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 392 | allow_allocation(false); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 393 | |
| 394 | if (FLAG_verify_heap) { |
| 395 | Verify(); |
| 396 | } |
| 397 | |
| 398 | if (FLAG_gc_verbose) Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 399 | #endif |
| 400 | |
| 401 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 402 | ReportStatisticsBeforeGC(); |
| 403 | #endif |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 404 | |
| 405 | LiveObjectList::GCPrologue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 406 | } |
| 407 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 408 | intptr_t Heap::SizeOfObjects() { |
| 409 | intptr_t total = 0; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 410 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 411 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 412 | total += space->SizeOfObjects(); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 413 | } |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 414 | return total; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | void Heap::GarbageCollectionEpilogue() { |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 418 | LiveObjectList::GCEpilogue(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 419 | #ifdef DEBUG |
| 420 | allow_allocation(true); |
| 421 | ZapFromSpace(); |
| 422 | |
| 423 | if (FLAG_verify_heap) { |
| 424 | Verify(); |
| 425 | } |
| 426 | |
| 427 | if (FLAG_print_global_handles) GlobalHandles::Print(); |
| 428 | if (FLAG_print_handles) PrintHandles(); |
| 429 | if (FLAG_gc_verbose) Print(); |
| 430 | if (FLAG_code_stats) ReportCodeStatistics("After GC"); |
| 431 | #endif |
| 432 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 433 | Counters::alive_after_last_gc.Set(static_cast<int>(SizeOfObjects())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 434 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 435 | Counters::symbol_table_capacity.Set(symbol_table()->Capacity()); |
| 436 | Counters::number_of_symbols.Set(symbol_table()->NumberOfElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 437 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 438 | ReportStatisticsAfterGC(); |
| 439 | #endif |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 440 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 441 | Debug::AfterGarbageCollection(); |
| 442 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 446 | void Heap::CollectAllGarbage(bool force_compaction) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 447 | // Since we are ignoring the return value, the exact choice of space does |
| 448 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 449 | // cause a full GC. |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 450 | MarkCompactCollector::SetForceCompaction(force_compaction); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 451 | CollectGarbage(OLD_POINTER_SPACE); |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 452 | MarkCompactCollector::SetForceCompaction(false); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 456 | void Heap::CollectAllAvailableGarbage() { |
| 457 | // Since we are ignoring the return value, the exact choice of space does |
| 458 | // not matter, so long as we do not specify NEW_SPACE, which would not |
| 459 | // cause a full GC. |
| 460 | MarkCompactCollector::SetForceCompaction(true); |
| 461 | |
| 462 | // Major GC would invoke weak handle callbacks on weakly reachable |
| 463 | // handles, but won't collect weakly reachable objects until next |
| 464 | // major GC. Therefore if we collect aggressively and weak handle callback |
| 465 | // has been invoked, we rerun major GC to release objects which become |
| 466 | // garbage. |
| 467 | // Note: as weak callbacks can execute arbitrary code, we cannot |
| 468 | // hope that eventually there will be no weak callbacks invocations. |
| 469 | // Therefore stop recollecting after several attempts. |
| 470 | const int kMaxNumberOfAttempts = 7; |
| 471 | for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) { |
| 472 | if (!CollectGarbage(OLD_POINTER_SPACE, MARK_COMPACTOR)) { |
| 473 | break; |
| 474 | } |
| 475 | } |
| 476 | MarkCompactCollector::SetForceCompaction(false); |
| 477 | } |
| 478 | |
| 479 | |
| 480 | bool Heap::CollectGarbage(AllocationSpace space, GarbageCollector collector) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 481 | // The VM is in the GC state until exiting this function. |
| 482 | VMState state(GC); |
| 483 | |
| 484 | #ifdef DEBUG |
| 485 | // Reset the allocation timeout to the GC interval, but make sure to |
| 486 | // allow at least a few allocations after a collection. The reason |
| 487 | // for this is that we have a lot of allocation sequences and we |
| 488 | // assume that a garbage collection will allow the subsequent |
| 489 | // allocation attempts to go through. |
| 490 | allocation_timeout_ = Max(6, FLAG_gc_interval); |
| 491 | #endif |
| 492 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 493 | bool next_gc_likely_to_collect_more = false; |
| 494 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 495 | { GCTracer tracer; |
| 496 | GarbageCollectionPrologue(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 497 | // The GC count was incremented in the prologue. Tell the tracer about |
| 498 | // it. |
| 499 | tracer.set_gc_count(gc_count_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 500 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 501 | // Tell the tracer which collector we've selected. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 502 | tracer.set_collector(collector); |
| 503 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 504 | HistogramTimer* rate = (collector == SCAVENGER) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 505 | ? &Counters::gc_scavenger |
| 506 | : &Counters::gc_compactor; |
| 507 | rate->Start(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 508 | next_gc_likely_to_collect_more = |
| 509 | PerformGarbageCollection(collector, &tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 510 | rate->Stop(); |
| 511 | |
| 512 | GarbageCollectionEpilogue(); |
| 513 | } |
| 514 | |
| 515 | |
| 516 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 517 | if (FLAG_log_gc) HeapProfiler::WriteSample(); |
| 518 | #endif |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 519 | |
| 520 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 524 | void Heap::PerformScavenge() { |
| 525 | GCTracer tracer; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 526 | PerformGarbageCollection(SCAVENGER, &tracer); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 530 | #ifdef DEBUG |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 531 | // Helper class for verifying the symbol table. |
| 532 | class SymbolTableVerifier : public ObjectVisitor { |
| 533 | public: |
| 534 | SymbolTableVerifier() { } |
| 535 | void VisitPointers(Object** start, Object** end) { |
| 536 | // Visit all HeapObject pointers in [start, end). |
| 537 | for (Object** p = start; p < end; p++) { |
| 538 | if ((*p)->IsHeapObject()) { |
| 539 | // Check that the symbol is actually a symbol. |
| 540 | ASSERT((*p)->IsNull() || (*p)->IsUndefined() || (*p)->IsSymbol()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 541 | } |
| 542 | } |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 543 | } |
| 544 | }; |
| 545 | #endif // DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 546 | |
kasperl@chromium.org | 416c5b0 | 2009-04-14 14:03:52 +0000 | [diff] [blame] | 547 | |
| 548 | static void VerifySymbolTable() { |
| 549 | #ifdef DEBUG |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 550 | SymbolTableVerifier verifier; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 551 | Heap::symbol_table()->IterateElements(&verifier); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 552 | #endif // DEBUG |
| 553 | } |
| 554 | |
| 555 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 556 | void Heap::ReserveSpace( |
| 557 | int new_space_size, |
| 558 | int pointer_space_size, |
| 559 | int data_space_size, |
| 560 | int code_space_size, |
| 561 | int map_space_size, |
| 562 | int cell_space_size, |
| 563 | int large_object_size) { |
| 564 | NewSpace* new_space = Heap::new_space(); |
| 565 | PagedSpace* old_pointer_space = Heap::old_pointer_space(); |
| 566 | PagedSpace* old_data_space = Heap::old_data_space(); |
| 567 | PagedSpace* code_space = Heap::code_space(); |
| 568 | PagedSpace* map_space = Heap::map_space(); |
| 569 | PagedSpace* cell_space = Heap::cell_space(); |
| 570 | LargeObjectSpace* lo_space = Heap::lo_space(); |
| 571 | bool gc_performed = true; |
| 572 | while (gc_performed) { |
| 573 | gc_performed = false; |
| 574 | if (!new_space->ReserveSpace(new_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 575 | Heap::CollectGarbage(NEW_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 576 | gc_performed = true; |
| 577 | } |
| 578 | if (!old_pointer_space->ReserveSpace(pointer_space_size)) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 579 | Heap::CollectGarbage(OLD_POINTER_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 580 | gc_performed = true; |
| 581 | } |
| 582 | if (!(old_data_space->ReserveSpace(data_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 583 | Heap::CollectGarbage(OLD_DATA_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 584 | gc_performed = true; |
| 585 | } |
| 586 | if (!(code_space->ReserveSpace(code_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 587 | Heap::CollectGarbage(CODE_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 588 | gc_performed = true; |
| 589 | } |
| 590 | if (!(map_space->ReserveSpace(map_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 591 | Heap::CollectGarbage(MAP_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 592 | gc_performed = true; |
| 593 | } |
| 594 | if (!(cell_space->ReserveSpace(cell_space_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 595 | Heap::CollectGarbage(CELL_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 596 | gc_performed = true; |
| 597 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 598 | // We add a slack-factor of 2 in order to have space for a series of |
| 599 | // 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] | 600 | large_object_size *= 2; |
| 601 | // The ReserveSpace method on the large object space checks how much |
| 602 | // we can expand the old generation. This includes expansion caused by |
| 603 | // allocation in the other spaces. |
| 604 | large_object_size += cell_space_size + map_space_size + code_space_size + |
| 605 | data_space_size + pointer_space_size; |
| 606 | if (!(lo_space->ReserveSpace(large_object_size))) { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 607 | Heap::CollectGarbage(LO_SPACE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 608 | gc_performed = true; |
| 609 | } |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 614 | void Heap::EnsureFromSpaceIsCommitted() { |
| 615 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 616 | |
| 617 | // Committing memory to from space failed. |
| 618 | // Try shrinking and try again. |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 619 | PagedSpaces spaces; |
| 620 | for (PagedSpace* space = spaces.next(); |
| 621 | space != NULL; |
| 622 | space = spaces.next()) { |
| 623 | space->RelinkPageListInChunkOrder(true); |
| 624 | } |
| 625 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 626 | Shrink(); |
| 627 | if (new_space_.CommitFromSpaceIfNeeded()) return; |
| 628 | |
| 629 | // Committing memory to from space failed again. |
| 630 | // Memory is exhausted and we will die. |
| 631 | V8::FatalProcessOutOfMemory("Committing semi space failed."); |
| 632 | } |
| 633 | |
| 634 | |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 635 | void Heap::ClearJSFunctionResultCaches() { |
| 636 | if (Bootstrapper::IsActive()) return; |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 637 | |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 638 | Object* context = global_contexts_list_; |
| 639 | while (!context->IsUndefined()) { |
| 640 | // Get the caches for this context: |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 641 | FixedArray* caches = |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 642 | Context::cast(context)->jsfunction_result_caches(); |
| 643 | // Clear the caches: |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 644 | int length = caches->length(); |
| 645 | for (int i = 0; i < length; i++) { |
| 646 | JSFunctionResultCache::cast(caches->get(i))->Clear(); |
| 647 | } |
fschneider@chromium.org | e03fb64 | 2010-11-01 12:34:09 +0000 | [diff] [blame] | 648 | // Get the next context: |
| 649 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 650 | } |
ager@chromium.org | ac091b7 | 2010-05-05 07:34:42 +0000 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 654 | void Heap::ClearNormalizedMapCaches() { |
| 655 | if (Bootstrapper::IsActive()) return; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 656 | |
| 657 | Object* context = global_contexts_list_; |
| 658 | while (!context->IsUndefined()) { |
| 659 | Context::cast(context)->normalized_map_cache()->Clear(); |
| 660 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 661 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 665 | #ifdef DEBUG |
| 666 | |
| 667 | enum PageWatermarkValidity { |
| 668 | ALL_VALID, |
| 669 | ALL_INVALID |
| 670 | }; |
| 671 | |
| 672 | static void VerifyPageWatermarkValidity(PagedSpace* space, |
| 673 | PageWatermarkValidity validity) { |
| 674 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 675 | bool expected_value = (validity == ALL_VALID); |
| 676 | while (it.has_next()) { |
| 677 | Page* page = it.next(); |
| 678 | ASSERT(page->IsWatermarkValid() == expected_value); |
| 679 | } |
| 680 | } |
| 681 | #endif |
| 682 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 683 | void Heap::UpdateSurvivalRateTrend(int start_new_space_size) { |
| 684 | double survival_rate = |
| 685 | (static_cast<double>(young_survivors_after_last_gc_) * 100) / |
| 686 | start_new_space_size; |
| 687 | |
| 688 | if (survival_rate > kYoungSurvivalRateThreshold) { |
| 689 | high_survival_rate_period_length_++; |
| 690 | } else { |
| 691 | high_survival_rate_period_length_ = 0; |
| 692 | } |
| 693 | |
| 694 | double survival_rate_diff = survival_rate_ - survival_rate; |
| 695 | |
| 696 | if (survival_rate_diff > kYoungSurvivalRateAllowedDeviation) { |
| 697 | set_survival_rate_trend(DECREASING); |
| 698 | } else if (survival_rate_diff < -kYoungSurvivalRateAllowedDeviation) { |
| 699 | set_survival_rate_trend(INCREASING); |
| 700 | } else { |
| 701 | set_survival_rate_trend(STABLE); |
| 702 | } |
| 703 | |
| 704 | survival_rate_ = survival_rate; |
| 705 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 706 | |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 707 | bool Heap::PerformGarbageCollection(GarbageCollector collector, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 708 | GCTracer* tracer) { |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 709 | bool next_gc_likely_to_collect_more = false; |
| 710 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 711 | if (collector != SCAVENGER) { |
| 712 | PROFILE(CodeMovingGCEvent()); |
| 713 | } |
| 714 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 715 | VerifySymbolTable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 716 | if (collector == MARK_COMPACTOR && global_gc_prologue_callback_) { |
| 717 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 718 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 719 | global_gc_prologue_callback_(); |
| 720 | } |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 721 | |
| 722 | GCType gc_type = |
| 723 | collector == MARK_COMPACTOR ? kGCTypeMarkSweepCompact : kGCTypeScavenge; |
| 724 | |
| 725 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 726 | if (gc_type & gc_prologue_callbacks_[i].gc_type) { |
| 727 | gc_prologue_callbacks_[i].callback(gc_type, kNoGCCallbackFlags); |
| 728 | } |
| 729 | } |
| 730 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 731 | EnsureFromSpaceIsCommitted(); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 732 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 733 | int start_new_space_size = Heap::new_space()->SizeAsInt(); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 734 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 735 | if (collector == MARK_COMPACTOR) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 736 | // Perform mark-sweep with optional compaction. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 737 | MarkCompact(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 738 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 739 | bool high_survival_rate_during_scavenges = IsHighSurvivalRate() && |
| 740 | IsStableOrIncreasingSurvivalTrend(); |
| 741 | |
| 742 | UpdateSurvivalRateTrend(start_new_space_size); |
| 743 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 744 | intptr_t old_gen_size = PromotedSpaceSize(); |
| 745 | old_gen_promotion_limit_ = |
| 746 | old_gen_size + Max(kMinimumPromotionLimit, old_gen_size / 3); |
| 747 | old_gen_allocation_limit_ = |
| 748 | old_gen_size + Max(kMinimumAllocationLimit, old_gen_size / 2); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 749 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 750 | if (high_survival_rate_during_scavenges && |
| 751 | IsStableOrIncreasingSurvivalTrend()) { |
| 752 | // Stable high survival rates of young objects both during partial and |
| 753 | // full collection indicate that mutator is either building or modifying |
| 754 | // a structure with a long lifetime. |
| 755 | // In this case we aggressively raise old generation memory limits to |
| 756 | // postpone subsequent mark-sweep collection and thus trade memory |
| 757 | // space for the mutation speed. |
| 758 | old_gen_promotion_limit_ *= 2; |
| 759 | old_gen_allocation_limit_ *= 2; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 760 | } |
| 761 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 762 | old_gen_exhausted_ = false; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 763 | } else { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 764 | tracer_ = tracer; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 765 | Scavenge(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 766 | tracer_ = NULL; |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 767 | |
| 768 | UpdateSurvivalRateTrend(start_new_space_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 769 | } |
ager@chromium.org | 439e85a | 2009-08-26 13:15:29 +0000 | [diff] [blame] | 770 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 771 | Counters::objs_since_last_young.Set(0); |
| 772 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 773 | if (collector == MARK_COMPACTOR) { |
| 774 | DisableAssertNoAllocation allow_allocation; |
| 775 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 776 | next_gc_likely_to_collect_more = |
| 777 | GlobalHandles::PostGarbageCollectionProcessing(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 778 | } |
| 779 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 780 | // Update relocatables. |
| 781 | Relocatable::PostGarbageCollectionProcessing(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 782 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 783 | if (collector == MARK_COMPACTOR) { |
| 784 | // Register the amount of external allocated memory. |
| 785 | amount_of_external_allocated_memory_at_last_global_gc_ = |
| 786 | amount_of_external_allocated_memory_; |
| 787 | } |
| 788 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 789 | GCCallbackFlags callback_flags = tracer->is_compacting() |
| 790 | ? kGCCallbackFlagCompacted |
| 791 | : kNoGCCallbackFlags; |
| 792 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 793 | if (gc_type & gc_epilogue_callbacks_[i].gc_type) { |
| 794 | gc_epilogue_callbacks_[i].callback(gc_type, callback_flags); |
| 795 | } |
| 796 | } |
| 797 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 798 | if (collector == MARK_COMPACTOR && global_gc_epilogue_callback_) { |
| 799 | ASSERT(!allocation_allowed_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 800 | GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 801 | global_gc_epilogue_callback_(); |
| 802 | } |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 803 | VerifySymbolTable(); |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 804 | |
| 805 | return next_gc_likely_to_collect_more; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 809 | void Heap::MarkCompact(GCTracer* tracer) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 810 | gc_state_ = MARK_COMPACT; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 811 | LOG(ResourceEvent("markcompact", "begin")); |
| 812 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 813 | MarkCompactCollector::Prepare(tracer); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 814 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 815 | bool is_compacting = MarkCompactCollector::IsCompacting(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 816 | |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 817 | if (is_compacting) { |
| 818 | mc_count_++; |
| 819 | } else { |
| 820 | ms_count_++; |
| 821 | } |
| 822 | tracer->set_full_gc_count(mc_count_ + ms_count_); |
| 823 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 824 | MarkCompactPrologue(is_compacting); |
| 825 | |
| 826 | MarkCompactCollector::CollectGarbage(); |
| 827 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 828 | LOG(ResourceEvent("markcompact", "end")); |
| 829 | |
| 830 | gc_state_ = NOT_IN_GC; |
| 831 | |
| 832 | Shrink(); |
| 833 | |
| 834 | Counters::objs_since_last_full.Set(0); |
kasperl@chromium.org | 8b2bb26 | 2010-03-01 09:46:28 +0000 | [diff] [blame] | 835 | |
| 836 | contexts_disposed_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 837 | } |
| 838 | |
| 839 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 840 | void Heap::MarkCompactPrologue(bool is_compacting) { |
| 841 | // At any old GC clear the keyed lookup cache to enable collection of unused |
| 842 | // maps. |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 843 | KeyedLookupCache::Clear(); |
| 844 | ContextSlotCache::Clear(); |
| 845 | DescriptorLookupCache::Clear(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 846 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 847 | RuntimeProfiler::MarkCompactPrologue(is_compacting); |
| 848 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 849 | CompilationCache::MarkCompactPrologue(); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 850 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 851 | CompletelyClearInstanceofCache(); |
| 852 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 853 | if (is_compacting) FlushNumberStringCache(); |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 854 | |
| 855 | ClearNormalizedMapCaches(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 859 | Object* Heap::FindCodeObject(Address a) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 860 | Object* obj = NULL; // Initialization to please compiler. |
| 861 | { MaybeObject* maybe_obj = code_space_->FindObject(a); |
| 862 | if (!maybe_obj->ToObject(&obj)) { |
| 863 | obj = lo_space_->FindObject(a)->ToObjectUnchecked(); |
| 864 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 865 | } |
| 866 | return obj; |
| 867 | } |
| 868 | |
| 869 | |
| 870 | // Helper class for copying HeapObjects |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 871 | class ScavengeVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 872 | public: |
| 873 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 874 | void VisitPointer(Object** p) { ScavengePointer(p); } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 875 | |
| 876 | void VisitPointers(Object** start, Object** end) { |
| 877 | // Copy all HeapObject pointers in [start, end) |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 878 | for (Object** p = start; p < end; p++) ScavengePointer(p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 879 | } |
| 880 | |
| 881 | private: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 882 | void ScavengePointer(Object** p) { |
| 883 | Object* object = *p; |
| 884 | if (!Heap::InNewSpace(object)) return; |
| 885 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 886 | reinterpret_cast<HeapObject*>(object)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 887 | } |
| 888 | }; |
| 889 | |
| 890 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 891 | // A queue of objects promoted during scavenge. Each object is accompanied |
| 892 | // 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] | 893 | class PromotionQueue { |
| 894 | public: |
| 895 | void Initialize(Address start_address) { |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 896 | front_ = rear_ = reinterpret_cast<intptr_t*>(start_address); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | bool is_empty() { return front_ <= rear_; } |
| 900 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 901 | void insert(HeapObject* target, int size) { |
| 902 | *(--rear_) = reinterpret_cast<intptr_t>(target); |
| 903 | *(--rear_) = size; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 904 | // Assert no overflow into live objects. |
| 905 | ASSERT(reinterpret_cast<Address>(rear_) >= Heap::new_space()->top()); |
| 906 | } |
| 907 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 908 | void remove(HeapObject** target, int* size) { |
| 909 | *target = reinterpret_cast<HeapObject*>(*(--front_)); |
| 910 | *size = static_cast<int>(*(--front_)); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 911 | // Assert no underflow. |
| 912 | ASSERT(front_ >= rear_); |
| 913 | } |
| 914 | |
| 915 | private: |
| 916 | // 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] | 917 | intptr_t* front_; |
| 918 | intptr_t* rear_; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 919 | }; |
| 920 | |
| 921 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 922 | // Shared state read by the scavenge collector and set by ScavengeObject. |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 923 | static PromotionQueue promotion_queue; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 924 | |
| 925 | |
| 926 | #ifdef DEBUG |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 927 | // 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] | 928 | // new space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 929 | class VerifyNonPointerSpacePointersVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 930 | public: |
| 931 | void VisitPointers(Object** start, Object**end) { |
| 932 | for (Object** current = start; current < end; current++) { |
| 933 | if ((*current)->IsHeapObject()) { |
| 934 | ASSERT(!Heap::InNewSpace(HeapObject::cast(*current))); |
| 935 | } |
| 936 | } |
| 937 | } |
| 938 | }; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 939 | |
| 940 | |
| 941 | static void VerifyNonPointerSpacePointers() { |
| 942 | // Verify that there are no pointers to new space in spaces where we |
| 943 | // do not expect them. |
| 944 | VerifyNonPointerSpacePointersVisitor v; |
| 945 | HeapObjectIterator code_it(Heap::code_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 946 | for (HeapObject* object = code_it.next(); |
| 947 | object != NULL; object = code_it.next()) |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 948 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 949 | |
| 950 | HeapObjectIterator data_it(Heap::old_data_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 951 | for (HeapObject* object = data_it.next(); |
| 952 | object != NULL; object = data_it.next()) |
| 953 | object->Iterate(&v); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 954 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 955 | #endif |
| 956 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 957 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 958 | void Heap::CheckNewSpaceExpansionCriteria() { |
| 959 | if (new_space_.Capacity() < new_space_.MaximumCapacity() && |
| 960 | survived_since_last_expansion_ > new_space_.Capacity()) { |
| 961 | // Grow the size of new space if there is room to grow and enough |
| 962 | // data has survived scavenge since the last expansion. |
| 963 | new_space_.Grow(); |
| 964 | survived_since_last_expansion_ = 0; |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 969 | void Heap::Scavenge() { |
| 970 | #ifdef DEBUG |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 971 | if (FLAG_enable_slow_asserts) VerifyNonPointerSpacePointers(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 972 | #endif |
| 973 | |
| 974 | gc_state_ = SCAVENGE; |
| 975 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 976 | Page::FlipMeaningOfInvalidatedWatermarkFlag(); |
| 977 | #ifdef DEBUG |
| 978 | VerifyPageWatermarkValidity(old_pointer_space_, ALL_VALID); |
| 979 | VerifyPageWatermarkValidity(map_space_, ALL_VALID); |
| 980 | #endif |
| 981 | |
| 982 | // We do not update an allocation watermark of the top page during linear |
| 983 | // allocation to avoid overhead. So to maintain the watermark invariant |
| 984 | // we have to manually cache the watermark and mark the top page as having an |
| 985 | // invalid watermark. This guarantees that dirty regions iteration will use a |
| 986 | // correct watermark even if a linear allocation happens. |
| 987 | old_pointer_space_->FlushTopPageWatermark(); |
| 988 | map_space_->FlushTopPageWatermark(); |
| 989 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 990 | // Implements Cheney's copying algorithm |
| 991 | LOG(ResourceEvent("scavenge", "begin")); |
| 992 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 993 | // Clear descriptor cache. |
| 994 | DescriptorLookupCache::Clear(); |
| 995 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 996 | // Used for updating survived_since_last_expansion_ at function end. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 997 | intptr_t survived_watermark = PromotedSpaceSize(); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 998 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 999 | CheckNewSpaceExpansionCriteria(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1000 | |
| 1001 | // Flip the semispaces. After flipping, to space is empty, from space has |
| 1002 | // live objects. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1003 | new_space_.Flip(); |
| 1004 | new_space_.ResetAllocationInfo(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1005 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1006 | // We need to sweep newly copied objects which can be either in the |
| 1007 | // to space or promoted to the old generation. For to-space |
| 1008 | // objects, we treat the bottom of the to space as a queue. Newly |
| 1009 | // copied and unswept objects lie between a 'front' mark and the |
| 1010 | // allocation pointer. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1011 | // |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1012 | // Promoted objects can go into various old-generation spaces, and |
| 1013 | // can be allocated internally in the spaces (from the free list). |
| 1014 | // We treat the top of the to space as a queue of addresses of |
| 1015 | // promoted objects. The addresses of newly promoted and unswept |
| 1016 | // objects lie between a 'front' mark and a 'rear' mark that is |
| 1017 | // updated as a side effect of promoting an object. |
| 1018 | // |
| 1019 | // There is guaranteed to be enough room at the top of the to space |
| 1020 | // for the addresses of promoted objects: every object promoted |
| 1021 | // frees up its size in bytes from the top of the new space, and |
| 1022 | // objects are at least one pointer in size. |
| 1023 | Address new_space_front = new_space_.ToSpaceLow(); |
| 1024 | promotion_queue.Initialize(new_space_.ToSpaceHigh()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1025 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1026 | ScavengeVisitor scavenge_visitor; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1027 | // Copy roots. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1028 | IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1029 | |
| 1030 | // Copy objects reachable from the old generation. By definition, |
| 1031 | // there are no intergenerational pointers in code or data spaces. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1032 | IterateDirtyRegions(old_pointer_space_, |
| 1033 | &IteratePointersInDirtyRegion, |
| 1034 | &ScavengePointer, |
| 1035 | WATERMARK_CAN_BE_INVALID); |
| 1036 | |
| 1037 | IterateDirtyRegions(map_space_, |
| 1038 | &IteratePointersInDirtyMapsRegion, |
| 1039 | &ScavengePointer, |
| 1040 | WATERMARK_CAN_BE_INVALID); |
| 1041 | |
| 1042 | lo_space_->IterateDirtyRegions(&ScavengePointer); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1043 | |
| 1044 | // Copy objects reachable from cells by scavenging cell values directly. |
| 1045 | HeapObjectIterator cell_iterator(cell_space_); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1046 | for (HeapObject* cell = cell_iterator.next(); |
| 1047 | cell != NULL; cell = cell_iterator.next()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1048 | if (cell->IsJSGlobalPropertyCell()) { |
| 1049 | Address value_address = |
| 1050 | reinterpret_cast<Address>(cell) + |
| 1051 | (JSGlobalPropertyCell::kValueOffset - kHeapObjectTag); |
| 1052 | scavenge_visitor.VisitPointer(reinterpret_cast<Object**>(value_address)); |
| 1053 | } |
| 1054 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1055 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1056 | // Scavenge object reachable from the global contexts list directly. |
| 1057 | scavenge_visitor.VisitPointer(BitCast<Object**>(&global_contexts_list_)); |
| 1058 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1059 | // Scavenge objects reachable from the runtime-profiler sampler |
| 1060 | // window directly. |
| 1061 | Object** sampler_window_address = RuntimeProfiler::SamplerWindowAddress(); |
| 1062 | int sampler_window_size = RuntimeProfiler::SamplerWindowSize(); |
| 1063 | scavenge_visitor.VisitPointers( |
| 1064 | sampler_window_address, |
| 1065 | sampler_window_address + sampler_window_size); |
| 1066 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1067 | new_space_front = DoScavenge(&scavenge_visitor, new_space_front); |
| 1068 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1069 | UpdateNewSpaceReferencesInExternalStringTable( |
| 1070 | &UpdateNewSpaceReferenceInExternalStringTableEntry); |
| 1071 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 1072 | LiveObjectList::UpdateReferencesForScavengeGC(); |
| 1073 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1074 | ASSERT(new_space_front == new_space_.top()); |
| 1075 | |
| 1076 | // Set age mark. |
| 1077 | new_space_.set_age_mark(new_space_.top()); |
| 1078 | |
| 1079 | // Update how much has survived scavenge. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 1080 | IncrementYoungSurvivorsCounter(static_cast<int>( |
| 1081 | (PromotedSpaceSize() - survived_watermark) + new_space_.Size())); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1082 | |
| 1083 | LOG(ResourceEvent("scavenge", "end")); |
| 1084 | |
| 1085 | gc_state_ = NOT_IN_GC; |
| 1086 | } |
| 1087 | |
| 1088 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1089 | String* Heap::UpdateNewSpaceReferenceInExternalStringTableEntry(Object** p) { |
| 1090 | MapWord first_word = HeapObject::cast(*p)->map_word(); |
| 1091 | |
| 1092 | if (!first_word.IsForwardingAddress()) { |
| 1093 | // Unreachable external string can be finalized. |
| 1094 | FinalizeExternalString(String::cast(*p)); |
| 1095 | return NULL; |
| 1096 | } |
| 1097 | |
| 1098 | // String is still reachable. |
| 1099 | return String::cast(first_word.ToForwardingAddress()); |
| 1100 | } |
| 1101 | |
| 1102 | |
| 1103 | void Heap::UpdateNewSpaceReferencesInExternalStringTable( |
| 1104 | ExternalStringTableUpdaterCallback updater_func) { |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1105 | ExternalStringTable::Verify(); |
| 1106 | |
| 1107 | if (ExternalStringTable::new_space_strings_.is_empty()) return; |
| 1108 | |
| 1109 | Object** start = &ExternalStringTable::new_space_strings_[0]; |
| 1110 | Object** end = start + ExternalStringTable::new_space_strings_.length(); |
| 1111 | Object** last = start; |
| 1112 | |
| 1113 | for (Object** p = start; p < end; ++p) { |
| 1114 | ASSERT(Heap::InFromSpace(*p)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1115 | String* target = updater_func(p); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1116 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1117 | if (target == NULL) continue; |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1118 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1119 | ASSERT(target->IsExternalString()); |
| 1120 | |
| 1121 | if (Heap::InNewSpace(target)) { |
| 1122 | // String is still in new space. Update the table entry. |
| 1123 | *last = target; |
| 1124 | ++last; |
| 1125 | } else { |
| 1126 | // String got promoted. Move it to the old string list. |
| 1127 | ExternalStringTable::AddOldString(target); |
| 1128 | } |
| 1129 | } |
| 1130 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1131 | ASSERT(last <= end); |
| 1132 | ExternalStringTable::ShrinkNewStrings(static_cast<int>(last - start)); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1133 | } |
| 1134 | |
| 1135 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1136 | static Object* ProcessFunctionWeakReferences(Object* function, |
| 1137 | WeakObjectRetainer* retainer) { |
| 1138 | Object* head = Heap::undefined_value(); |
| 1139 | JSFunction* tail = NULL; |
| 1140 | Object* candidate = function; |
| 1141 | while (!candidate->IsUndefined()) { |
| 1142 | // Check whether to keep the candidate in the list. |
| 1143 | JSFunction* candidate_function = reinterpret_cast<JSFunction*>(candidate); |
| 1144 | Object* retain = retainer->RetainAs(candidate); |
| 1145 | if (retain != NULL) { |
| 1146 | if (head->IsUndefined()) { |
| 1147 | // First element in the list. |
| 1148 | head = candidate_function; |
| 1149 | } else { |
| 1150 | // Subsequent elements in the list. |
| 1151 | ASSERT(tail != NULL); |
| 1152 | tail->set_next_function_link(candidate_function); |
| 1153 | } |
| 1154 | // Retained function is new tail. |
| 1155 | tail = candidate_function; |
| 1156 | } |
| 1157 | // Move to next element in the list. |
| 1158 | candidate = candidate_function->next_function_link(); |
| 1159 | } |
| 1160 | |
| 1161 | // Terminate the list if there is one or more elements. |
| 1162 | if (tail != NULL) { |
| 1163 | tail->set_next_function_link(Heap::undefined_value()); |
| 1164 | } |
| 1165 | |
| 1166 | return head; |
| 1167 | } |
| 1168 | |
| 1169 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1170 | void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) { |
| 1171 | Object* head = undefined_value(); |
| 1172 | Context* tail = NULL; |
| 1173 | Object* candidate = global_contexts_list_; |
| 1174 | while (!candidate->IsUndefined()) { |
| 1175 | // Check whether to keep the candidate in the list. |
| 1176 | Context* candidate_context = reinterpret_cast<Context*>(candidate); |
| 1177 | Object* retain = retainer->RetainAs(candidate); |
| 1178 | if (retain != NULL) { |
| 1179 | if (head->IsUndefined()) { |
| 1180 | // First element in the list. |
| 1181 | head = candidate_context; |
| 1182 | } else { |
| 1183 | // Subsequent elements in the list. |
| 1184 | ASSERT(tail != NULL); |
| 1185 | tail->set_unchecked(Context::NEXT_CONTEXT_LINK, |
| 1186 | candidate_context, |
| 1187 | UPDATE_WRITE_BARRIER); |
| 1188 | } |
| 1189 | // Retained context is new tail. |
| 1190 | tail = candidate_context; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1191 | |
| 1192 | // Process the weak list of optimized functions for the context. |
| 1193 | Object* function_list_head = |
| 1194 | ProcessFunctionWeakReferences( |
| 1195 | candidate_context->get(Context::OPTIMIZED_FUNCTIONS_LIST), |
| 1196 | retainer); |
| 1197 | candidate_context->set_unchecked(Context::OPTIMIZED_FUNCTIONS_LIST, |
| 1198 | function_list_head, |
| 1199 | UPDATE_WRITE_BARRIER); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1200 | } |
| 1201 | // Move to next element in the list. |
| 1202 | candidate = candidate_context->get(Context::NEXT_CONTEXT_LINK); |
| 1203 | } |
| 1204 | |
| 1205 | // Terminate the list if there is one or more elements. |
| 1206 | if (tail != NULL) { |
| 1207 | tail->set_unchecked(Context::NEXT_CONTEXT_LINK, |
| 1208 | Heap::undefined_value(), |
| 1209 | UPDATE_WRITE_BARRIER); |
| 1210 | } |
| 1211 | |
| 1212 | // Update the head of the list of contexts. |
| 1213 | Heap::global_contexts_list_ = head; |
| 1214 | } |
| 1215 | |
| 1216 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1217 | class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> { |
| 1218 | public: |
| 1219 | static inline void VisitPointer(Object** p) { |
| 1220 | Object* object = *p; |
| 1221 | if (!Heap::InNewSpace(object)) return; |
| 1222 | Heap::ScavengeObject(reinterpret_cast<HeapObject**>(p), |
| 1223 | reinterpret_cast<HeapObject*>(object)); |
| 1224 | } |
| 1225 | }; |
| 1226 | |
| 1227 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1228 | Address Heap::DoScavenge(ObjectVisitor* scavenge_visitor, |
| 1229 | Address new_space_front) { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1230 | do { |
| 1231 | ASSERT(new_space_front <= new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1232 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1233 | // The addresses new_space_front and new_space_.top() define a |
| 1234 | // queue of unprocessed copied objects. Process them until the |
| 1235 | // queue is empty. |
| 1236 | while (new_space_front < new_space_.top()) { |
| 1237 | HeapObject* object = HeapObject::FromAddress(new_space_front); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1238 | new_space_front += NewSpaceScavenger::IterateBody(object->map(), object); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1239 | } |
| 1240 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1241 | // Promote and process all the to-be-promoted objects. |
| 1242 | while (!promotion_queue.is_empty()) { |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1243 | HeapObject* target; |
| 1244 | int size; |
| 1245 | promotion_queue.remove(&target, &size); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1246 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1247 | // Promoted object might be already partially visited |
| 1248 | // during dirty regions iteration. Thus we search specificly |
| 1249 | // for pointers to from semispace instead of looking for pointers |
| 1250 | // to new space. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1251 | ASSERT(!target->IsMap()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1252 | IterateAndMarkPointersToFromSpace(target->address(), |
| 1253 | target->address() + size, |
| 1254 | &ScavengePointer); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1255 | } |
| 1256 | |
| 1257 | // Take another spin if there are now unswept objects in new space |
| 1258 | // (there are currently no more unswept promoted objects). |
| 1259 | } while (new_space_front < new_space_.top()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1260 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1261 | return new_space_front; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1262 | } |
| 1263 | |
| 1264 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1265 | class ScavengingVisitor : public StaticVisitorBase { |
| 1266 | public: |
| 1267 | static void Initialize() { |
| 1268 | table_.Register(kVisitSeqAsciiString, &EvacuateSeqAsciiString); |
| 1269 | table_.Register(kVisitSeqTwoByteString, &EvacuateSeqTwoByteString); |
| 1270 | table_.Register(kVisitShortcutCandidate, &EvacuateShortcutCandidate); |
| 1271 | table_.Register(kVisitByteArray, &EvacuateByteArray); |
| 1272 | table_.Register(kVisitFixedArray, &EvacuateFixedArray); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1273 | table_.Register(kVisitGlobalContext, |
| 1274 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1275 | VisitSpecialized<Context::kSize>); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1276 | |
| 1277 | typedef ObjectEvacuationStrategy<POINTER_OBJECT> PointerObject; |
| 1278 | |
| 1279 | table_.Register(kVisitConsString, |
| 1280 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1281 | VisitSpecialized<ConsString::kSize>); |
| 1282 | |
| 1283 | table_.Register(kVisitSharedFunctionInfo, |
| 1284 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1285 | VisitSpecialized<SharedFunctionInfo::kSize>); |
| 1286 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1287 | table_.Register(kVisitJSFunction, |
| 1288 | &ObjectEvacuationStrategy<POINTER_OBJECT>:: |
| 1289 | VisitSpecialized<JSFunction::kSize>); |
| 1290 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1291 | table_.RegisterSpecializations<ObjectEvacuationStrategy<DATA_OBJECT>, |
| 1292 | kVisitDataObject, |
| 1293 | kVisitDataObjectGeneric>(); |
| 1294 | |
| 1295 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1296 | kVisitJSObject, |
| 1297 | kVisitJSObjectGeneric>(); |
| 1298 | |
| 1299 | table_.RegisterSpecializations<ObjectEvacuationStrategy<POINTER_OBJECT>, |
| 1300 | kVisitStruct, |
| 1301 | kVisitStructGeneric>(); |
| 1302 | } |
| 1303 | |
| 1304 | |
| 1305 | static inline void Scavenge(Map* map, HeapObject** slot, HeapObject* obj) { |
| 1306 | table_.GetVisitor(map)(map, slot, obj); |
| 1307 | } |
| 1308 | |
| 1309 | |
| 1310 | private: |
| 1311 | enum ObjectContents { DATA_OBJECT, POINTER_OBJECT }; |
| 1312 | enum SizeRestriction { SMALL, UNKNOWN_SIZE }; |
| 1313 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1314 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1315 | static void RecordCopiedObject(HeapObject* obj) { |
| 1316 | bool should_record = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1317 | #ifdef DEBUG |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1318 | should_record = FLAG_heap_stats; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1319 | #endif |
| 1320 | #ifdef ENABLE_LOGGING_AND_PROFILING |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1321 | should_record = should_record || FLAG_log_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1322 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1323 | if (should_record) { |
| 1324 | if (Heap::new_space()->Contains(obj)) { |
| 1325 | Heap::new_space()->RecordAllocation(obj); |
| 1326 | } else { |
| 1327 | Heap::new_space()->RecordPromotion(obj); |
| 1328 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1329 | } |
| 1330 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1331 | #endif // defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 1332 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1333 | // Helper function used by CopyObject to copy a source object to an |
| 1334 | // allocated target object and update the forwarding pointer in the source |
| 1335 | // object. Returns the target object. |
| 1336 | INLINE(static HeapObject* MigrateObject(HeapObject* source, |
| 1337 | HeapObject* target, |
| 1338 | int size)) { |
| 1339 | // Copy the content of source to target. |
| 1340 | Heap::CopyBlock(target->address(), source->address(), size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1341 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1342 | // Set the forwarding address. |
| 1343 | source->set_map_word(MapWord::FromForwardingAddress(target)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1344 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1345 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1346 | // Update NewSpace stats if necessary. |
| 1347 | RecordCopiedObject(target); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1348 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1349 | HEAP_PROFILE(ObjectMoveEvent(source->address(), target->address())); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 1350 | #if defined(ENABLE_LOGGING_AND_PROFILING) |
| 1351 | if (Logger::is_logging() || CpuProfiler::is_profiling()) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 1352 | if (target->IsSharedFunctionInfo()) { |
| 1353 | PROFILE(SFIMoveEvent(source->address(), target->address())); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 1354 | } |
| 1355 | } |
| 1356 | #endif |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1357 | return target; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1358 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1359 | |
| 1360 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1361 | template<ObjectContents object_contents, SizeRestriction size_restriction> |
| 1362 | static inline void EvacuateObject(Map* map, |
| 1363 | HeapObject** slot, |
| 1364 | HeapObject* object, |
| 1365 | int object_size) { |
| 1366 | ASSERT((size_restriction != SMALL) || |
| 1367 | (object_size <= Page::kMaxHeapObjectSize)); |
| 1368 | ASSERT(object->Size() == object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1369 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1370 | if (Heap::ShouldBePromoted(object->address(), object_size)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1371 | MaybeObject* maybe_result; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1372 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1373 | if ((size_restriction != SMALL) && |
| 1374 | (object_size > Page::kMaxHeapObjectSize)) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1375 | maybe_result = Heap::lo_space()->AllocateRawFixedArray(object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1376 | } else { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1377 | if (object_contents == DATA_OBJECT) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1378 | maybe_result = Heap::old_data_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1379 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1380 | maybe_result = Heap::old_pointer_space()->AllocateRaw(object_size); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1381 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1382 | } |
| 1383 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1384 | Object* result = NULL; // Initialization to please compiler. |
| 1385 | if (maybe_result->ToObject(&result)) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1386 | HeapObject* target = HeapObject::cast(result); |
| 1387 | *slot = MigrateObject(object, target, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1388 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1389 | if (object_contents == POINTER_OBJECT) { |
| 1390 | promotion_queue.insert(target, object_size); |
| 1391 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1392 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1393 | Heap::tracer()->increment_promoted_objects_size(object_size); |
| 1394 | return; |
| 1395 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1396 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1397 | Object* result = |
| 1398 | Heap::new_space()->AllocateRaw(object_size)->ToObjectUnchecked(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1399 | *slot = MigrateObject(object, HeapObject::cast(result), object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1400 | return; |
| 1401 | } |
| 1402 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1403 | |
| 1404 | static inline void EvacuateFixedArray(Map* map, |
| 1405 | HeapObject** slot, |
| 1406 | HeapObject* object) { |
| 1407 | int object_size = FixedArray::BodyDescriptor::SizeOf(map, object); |
| 1408 | EvacuateObject<POINTER_OBJECT, UNKNOWN_SIZE>(map, |
| 1409 | slot, |
| 1410 | object, |
| 1411 | object_size); |
| 1412 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1413 | |
| 1414 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1415 | static inline void EvacuateByteArray(Map* map, |
| 1416 | HeapObject** slot, |
| 1417 | HeapObject* object) { |
| 1418 | int object_size = reinterpret_cast<ByteArray*>(object)->ByteArraySize(); |
| 1419 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1420 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1421 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1422 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1423 | static inline void EvacuateSeqAsciiString(Map* map, |
| 1424 | HeapObject** slot, |
| 1425 | HeapObject* object) { |
| 1426 | int object_size = SeqAsciiString::cast(object)-> |
| 1427 | SeqAsciiStringSize(map->instance_type()); |
| 1428 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1429 | } |
| 1430 | |
| 1431 | |
| 1432 | static inline void EvacuateSeqTwoByteString(Map* map, |
| 1433 | HeapObject** slot, |
| 1434 | HeapObject* object) { |
| 1435 | int object_size = SeqTwoByteString::cast(object)-> |
| 1436 | SeqTwoByteStringSize(map->instance_type()); |
| 1437 | EvacuateObject<DATA_OBJECT, UNKNOWN_SIZE>(map, slot, object, object_size); |
| 1438 | } |
| 1439 | |
| 1440 | |
| 1441 | static inline bool IsShortcutCandidate(int type) { |
| 1442 | return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| 1443 | } |
| 1444 | |
| 1445 | static inline void EvacuateShortcutCandidate(Map* map, |
| 1446 | HeapObject** slot, |
| 1447 | HeapObject* object) { |
| 1448 | ASSERT(IsShortcutCandidate(map->instance_type())); |
| 1449 | |
| 1450 | if (ConsString::cast(object)->unchecked_second() == Heap::empty_string()) { |
| 1451 | HeapObject* first = |
| 1452 | HeapObject::cast(ConsString::cast(object)->unchecked_first()); |
| 1453 | |
| 1454 | *slot = first; |
| 1455 | |
| 1456 | if (!Heap::InNewSpace(first)) { |
| 1457 | object->set_map_word(MapWord::FromForwardingAddress(first)); |
| 1458 | return; |
| 1459 | } |
| 1460 | |
| 1461 | MapWord first_word = first->map_word(); |
| 1462 | if (first_word.IsForwardingAddress()) { |
| 1463 | HeapObject* target = first_word.ToForwardingAddress(); |
| 1464 | |
| 1465 | *slot = target; |
| 1466 | object->set_map_word(MapWord::FromForwardingAddress(target)); |
| 1467 | return; |
| 1468 | } |
| 1469 | |
| 1470 | Scavenge(first->map(), slot, first); |
| 1471 | object->set_map_word(MapWord::FromForwardingAddress(*slot)); |
| 1472 | return; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1473 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1474 | |
| 1475 | int object_size = ConsString::kSize; |
| 1476 | EvacuateObject<POINTER_OBJECT, SMALL>(map, slot, object, object_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1477 | } |
| 1478 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1479 | template<ObjectContents object_contents> |
| 1480 | class ObjectEvacuationStrategy { |
| 1481 | public: |
| 1482 | template<int object_size> |
| 1483 | static inline void VisitSpecialized(Map* map, |
| 1484 | HeapObject** slot, |
| 1485 | HeapObject* object) { |
| 1486 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1487 | } |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1488 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1489 | static inline void Visit(Map* map, |
| 1490 | HeapObject** slot, |
| 1491 | HeapObject* object) { |
| 1492 | int object_size = map->instance_size(); |
| 1493 | EvacuateObject<object_contents, SMALL>(map, slot, object, object_size); |
| 1494 | } |
| 1495 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1496 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1497 | typedef void (*Callback)(Map* map, HeapObject** slot, HeapObject* object); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1498 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1499 | static VisitorDispatchTable<Callback> table_; |
| 1500 | }; |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1501 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1502 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1503 | VisitorDispatchTable<ScavengingVisitor::Callback> ScavengingVisitor::table_; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1504 | |
| 1505 | |
| 1506 | void Heap::ScavengeObjectSlow(HeapObject** p, HeapObject* object) { |
| 1507 | ASSERT(InFromSpace(object)); |
| 1508 | MapWord first_word = object->map_word(); |
| 1509 | ASSERT(!first_word.IsForwardingAddress()); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1510 | Map* map = first_word.ToMap(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1511 | ScavengingVisitor::Scavenge(map, p, object); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1512 | } |
| 1513 | |
| 1514 | |
| 1515 | void Heap::ScavengePointer(HeapObject** p) { |
| 1516 | ScavengeObject(p, *p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1517 | } |
| 1518 | |
| 1519 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1520 | MaybeObject* Heap::AllocatePartialMap(InstanceType instance_type, |
| 1521 | int instance_size) { |
| 1522 | Object* result; |
| 1523 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1524 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1525 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1526 | |
| 1527 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1528 | reinterpret_cast<Map*>(result)->set_map(raw_unchecked_meta_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1529 | reinterpret_cast<Map*>(result)->set_instance_type(instance_type); |
| 1530 | reinterpret_cast<Map*>(result)->set_instance_size(instance_size); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 1531 | reinterpret_cast<Map*>(result)-> |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1532 | set_visitor_id( |
| 1533 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1534 | reinterpret_cast<Map*>(result)->set_inobject_properties(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1535 | reinterpret_cast<Map*>(result)->set_pre_allocated_property_fields(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1536 | reinterpret_cast<Map*>(result)->set_unused_property_fields(0); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1537 | reinterpret_cast<Map*>(result)->set_bit_field(0); |
| 1538 | reinterpret_cast<Map*>(result)->set_bit_field2(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1539 | return result; |
| 1540 | } |
| 1541 | |
| 1542 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1543 | MaybeObject* Heap::AllocateMap(InstanceType instance_type, int instance_size) { |
| 1544 | Object* result; |
| 1545 | { MaybeObject* maybe_result = AllocateRawMap(); |
| 1546 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1547 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1548 | |
| 1549 | Map* map = reinterpret_cast<Map*>(result); |
| 1550 | map->set_map(meta_map()); |
| 1551 | map->set_instance_type(instance_type); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1552 | map->set_visitor_id( |
| 1553 | StaticVisitorBase::GetVisitorId(instance_type, instance_size)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1554 | map->set_prototype(null_value()); |
| 1555 | map->set_constructor(null_value()); |
| 1556 | map->set_instance_size(instance_size); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 1557 | map->set_inobject_properties(0); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1558 | map->set_pre_allocated_property_fields(0); |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1559 | map->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1560 | map->set_code_cache(empty_fixed_array()); |
| 1561 | map->set_unused_property_fields(0); |
| 1562 | map->set_bit_field(0); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 1563 | map->set_bit_field2((1 << Map::kIsExtensible) | (1 << Map::kHasFastElements)); |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 1564 | |
| 1565 | // If the map object is aligned fill the padding area with Smi 0 objects. |
| 1566 | if (Map::kPadStart < Map::kSize) { |
| 1567 | memset(reinterpret_cast<byte*>(map) + Map::kPadStart - kHeapObjectTag, |
| 1568 | 0, |
| 1569 | Map::kSize - Map::kPadStart); |
| 1570 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1571 | return map; |
| 1572 | } |
| 1573 | |
| 1574 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1575 | MaybeObject* Heap::AllocateCodeCache() { |
| 1576 | Object* result; |
| 1577 | { MaybeObject* maybe_result = AllocateStruct(CODE_CACHE_TYPE); |
| 1578 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1579 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 1580 | CodeCache* code_cache = CodeCache::cast(result); |
| 1581 | code_cache->set_default_cache(empty_fixed_array()); |
| 1582 | code_cache->set_normal_type_cache(undefined_value()); |
| 1583 | return code_cache; |
| 1584 | } |
| 1585 | |
| 1586 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1587 | const Heap::StringTypeTable Heap::string_type_table[] = { |
| 1588 | #define STRING_TYPE_ELEMENT(type, size, name, camel_name) \ |
| 1589 | {type, size, k##camel_name##MapRootIndex}, |
| 1590 | STRING_TYPE_LIST(STRING_TYPE_ELEMENT) |
| 1591 | #undef STRING_TYPE_ELEMENT |
| 1592 | }; |
| 1593 | |
| 1594 | |
| 1595 | const Heap::ConstantSymbolTable Heap::constant_symbol_table[] = { |
| 1596 | #define CONSTANT_SYMBOL_ELEMENT(name, contents) \ |
| 1597 | {contents, k##name##RootIndex}, |
| 1598 | SYMBOL_LIST(CONSTANT_SYMBOL_ELEMENT) |
| 1599 | #undef CONSTANT_SYMBOL_ELEMENT |
| 1600 | }; |
| 1601 | |
| 1602 | |
| 1603 | const Heap::StructTable Heap::struct_table[] = { |
| 1604 | #define STRUCT_TABLE_ELEMENT(NAME, Name, name) \ |
| 1605 | { NAME##_TYPE, Name::kSize, k##Name##MapRootIndex }, |
| 1606 | STRUCT_LIST(STRUCT_TABLE_ELEMENT) |
| 1607 | #undef STRUCT_TABLE_ELEMENT |
| 1608 | }; |
| 1609 | |
| 1610 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1611 | bool Heap::CreateInitialMaps() { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1612 | Object* obj; |
| 1613 | { MaybeObject* maybe_obj = AllocatePartialMap(MAP_TYPE, Map::kSize); |
| 1614 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1615 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1616 | // Map::cast cannot be used due to uninitialized map field. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1617 | Map* new_meta_map = reinterpret_cast<Map*>(obj); |
| 1618 | set_meta_map(new_meta_map); |
| 1619 | new_meta_map->set_map(new_meta_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1620 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1621 | { MaybeObject* maybe_obj = |
| 1622 | AllocatePartialMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1623 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1624 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1625 | set_fixed_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1626 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1627 | { MaybeObject* maybe_obj = AllocatePartialMap(ODDBALL_TYPE, Oddball::kSize); |
| 1628 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1629 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1630 | set_oddball_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1631 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 1632 | // Allocate the empty array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1633 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1634 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1635 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1636 | set_empty_fixed_array(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1637 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1638 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_DATA_SPACE); |
| 1639 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1640 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1641 | set_null_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1642 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1643 | // Allocate the empty descriptor array. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1644 | { MaybeObject* maybe_obj = AllocateEmptyFixedArray(); |
| 1645 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1646 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1647 | set_empty_descriptor_array(DescriptorArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1648 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1649 | // Fix the instance_descriptors for the existing maps. |
| 1650 | meta_map()->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1651 | meta_map()->set_code_cache(empty_fixed_array()); |
| 1652 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1653 | fixed_array_map()->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1654 | fixed_array_map()->set_code_cache(empty_fixed_array()); |
| 1655 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1656 | oddball_map()->set_instance_descriptors(empty_descriptor_array()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1657 | oddball_map()->set_code_cache(empty_fixed_array()); |
| 1658 | |
| 1659 | // Fix prototype object for existing maps. |
| 1660 | meta_map()->set_prototype(null_value()); |
| 1661 | meta_map()->set_constructor(null_value()); |
| 1662 | |
| 1663 | fixed_array_map()->set_prototype(null_value()); |
| 1664 | fixed_array_map()->set_constructor(null_value()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1665 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1666 | oddball_map()->set_prototype(null_value()); |
| 1667 | oddball_map()->set_constructor(null_value()); |
| 1668 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1669 | { MaybeObject* maybe_obj = |
| 1670 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1671 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1672 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1673 | set_fixed_cow_array_map(Map::cast(obj)); |
| 1674 | ASSERT(fixed_array_map() != fixed_cow_array_map()); |
| 1675 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1676 | { MaybeObject* maybe_obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize); |
| 1677 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1678 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1679 | set_heap_number_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1680 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1681 | { MaybeObject* maybe_obj = AllocateMap(PROXY_TYPE, Proxy::kSize); |
| 1682 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1683 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1684 | set_proxy_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1685 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1686 | for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) { |
| 1687 | const StringTypeTable& entry = string_type_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1688 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 1689 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1690 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1691 | roots_[entry.index] = Map::cast(obj); |
| 1692 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1693 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1694 | { MaybeObject* maybe_obj = AllocateMap(STRING_TYPE, kVariableSizeSentinel); |
| 1695 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1696 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1697 | set_undetectable_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1698 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1699 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1700 | { MaybeObject* maybe_obj = |
| 1701 | AllocateMap(ASCII_STRING_TYPE, kVariableSizeSentinel); |
| 1702 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1703 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 1704 | set_undetectable_ascii_string_map(Map::cast(obj)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1705 | Map::cast(obj)->set_is_undetectable(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1706 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1707 | { MaybeObject* maybe_obj = |
| 1708 | AllocateMap(BYTE_ARRAY_TYPE, kVariableSizeSentinel); |
| 1709 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1710 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1711 | set_byte_array_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1712 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1713 | { MaybeObject* maybe_obj = AllocateByteArray(0, TENURED); |
| 1714 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1715 | } |
| 1716 | set_empty_byte_array(ByteArray::cast(obj)); |
| 1717 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1718 | { MaybeObject* maybe_obj = |
| 1719 | AllocateMap(PIXEL_ARRAY_TYPE, PixelArray::kAlignedSize); |
| 1720 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1721 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 1722 | set_pixel_array_map(Map::cast(obj)); |
| 1723 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1724 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_BYTE_ARRAY_TYPE, |
| 1725 | ExternalArray::kAlignedSize); |
| 1726 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1727 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1728 | set_external_byte_array_map(Map::cast(obj)); |
| 1729 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1730 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE, |
| 1731 | ExternalArray::kAlignedSize); |
| 1732 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1733 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1734 | set_external_unsigned_byte_array_map(Map::cast(obj)); |
| 1735 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1736 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_SHORT_ARRAY_TYPE, |
| 1737 | ExternalArray::kAlignedSize); |
| 1738 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1739 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1740 | set_external_short_array_map(Map::cast(obj)); |
| 1741 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1742 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE, |
| 1743 | ExternalArray::kAlignedSize); |
| 1744 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1745 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1746 | set_external_unsigned_short_array_map(Map::cast(obj)); |
| 1747 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1748 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_INT_ARRAY_TYPE, |
| 1749 | ExternalArray::kAlignedSize); |
| 1750 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1751 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1752 | set_external_int_array_map(Map::cast(obj)); |
| 1753 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1754 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_INT_ARRAY_TYPE, |
| 1755 | ExternalArray::kAlignedSize); |
| 1756 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1757 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1758 | set_external_unsigned_int_array_map(Map::cast(obj)); |
| 1759 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1760 | { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_FLOAT_ARRAY_TYPE, |
| 1761 | ExternalArray::kAlignedSize); |
| 1762 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1763 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1764 | set_external_float_array_map(Map::cast(obj)); |
| 1765 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1766 | { MaybeObject* maybe_obj = AllocateMap(CODE_TYPE, kVariableSizeSentinel); |
| 1767 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1768 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1769 | set_code_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1770 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1771 | { MaybeObject* maybe_obj = AllocateMap(JS_GLOBAL_PROPERTY_CELL_TYPE, |
| 1772 | JSGlobalPropertyCell::kSize); |
| 1773 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1774 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1775 | set_global_property_cell_map(Map::cast(obj)); |
| 1776 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1777 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, kPointerSize); |
| 1778 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1779 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1780 | set_one_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1781 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1782 | { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, 2 * kPointerSize); |
| 1783 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1784 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1785 | set_two_pointer_filler_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1786 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1787 | for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) { |
| 1788 | const StructTable& entry = struct_table[i]; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1789 | { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size); |
| 1790 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1791 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1792 | roots_[entry.index] = Map::cast(obj); |
| 1793 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1794 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1795 | { MaybeObject* maybe_obj = |
| 1796 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1797 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1798 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1799 | set_hash_table_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1800 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1801 | { MaybeObject* maybe_obj = |
| 1802 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1803 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1804 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1805 | set_context_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1806 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1807 | { MaybeObject* maybe_obj = |
| 1808 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1809 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1810 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1811 | set_catch_context_map(Map::cast(obj)); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1812 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1813 | { MaybeObject* maybe_obj = |
| 1814 | AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel); |
| 1815 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1816 | } |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1817 | Map* global_context_map = Map::cast(obj); |
| 1818 | global_context_map->set_visitor_id(StaticVisitorBase::kVisitGlobalContext); |
| 1819 | set_global_context_map(global_context_map); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1820 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1821 | { MaybeObject* maybe_obj = AllocateMap(SHARED_FUNCTION_INFO_TYPE, |
| 1822 | SharedFunctionInfo::kAlignedSize); |
| 1823 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1824 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1825 | set_shared_function_info_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1826 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 1827 | { MaybeObject* maybe_obj = AllocateMap(JS_MESSAGE_OBJECT_TYPE, |
| 1828 | JSMessageObject::kSize); |
| 1829 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1830 | } |
| 1831 | set_message_object_map(Map::cast(obj)); |
| 1832 | |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 1833 | ASSERT(!Heap::InNewSpace(Heap::empty_fixed_array())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1834 | return true; |
| 1835 | } |
| 1836 | |
| 1837 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1838 | MaybeObject* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1839 | // Statically ensure that it is safe to allocate heap numbers in paged |
| 1840 | // spaces. |
| 1841 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1842 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1843 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1844 | Object* result; |
| 1845 | { MaybeObject* maybe_result = |
| 1846 | AllocateRaw(HeapNumber::kSize, space, OLD_DATA_SPACE); |
| 1847 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1848 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1849 | |
| 1850 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 1851 | HeapNumber::cast(result)->set_value(value); |
| 1852 | return result; |
| 1853 | } |
| 1854 | |
| 1855 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1856 | MaybeObject* Heap::AllocateHeapNumber(double value) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1857 | // Use general version, if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 1858 | if (always_allocate()) return AllocateHeapNumber(value, TENURED); |
| 1859 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1860 | // This version of AllocateHeapNumber is optimized for |
| 1861 | // allocation in new space. |
| 1862 | STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxHeapObjectSize); |
| 1863 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1864 | Object* result; |
| 1865 | { MaybeObject* maybe_result = new_space_.AllocateRaw(HeapNumber::kSize); |
| 1866 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1867 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1868 | HeapObject::cast(result)->set_map(heap_number_map()); |
| 1869 | HeapNumber::cast(result)->set_value(value); |
| 1870 | return result; |
| 1871 | } |
| 1872 | |
| 1873 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1874 | MaybeObject* Heap::AllocateJSGlobalPropertyCell(Object* value) { |
| 1875 | Object* result; |
| 1876 | { MaybeObject* maybe_result = AllocateRawCell(); |
| 1877 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1878 | } |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1879 | HeapObject::cast(result)->set_map(global_property_cell_map()); |
| 1880 | JSGlobalPropertyCell::cast(result)->set_value(value); |
| 1881 | return result; |
| 1882 | } |
| 1883 | |
| 1884 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1885 | MaybeObject* Heap::CreateOddball(const char* to_string, |
| 1886 | Object* to_number) { |
| 1887 | Object* result; |
| 1888 | { MaybeObject* maybe_result = Allocate(oddball_map(), OLD_DATA_SPACE); |
| 1889 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 1890 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1891 | return Oddball::cast(result)->Initialize(to_string, to_number); |
| 1892 | } |
| 1893 | |
| 1894 | |
| 1895 | bool Heap::CreateApiObjects() { |
| 1896 | Object* obj; |
| 1897 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1898 | { MaybeObject* maybe_obj = AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize); |
| 1899 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1900 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1901 | set_neander_map(Map::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1902 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1903 | { MaybeObject* maybe_obj = Heap::AllocateJSObjectFromMap(neander_map()); |
| 1904 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1905 | } |
| 1906 | Object* elements; |
| 1907 | { MaybeObject* maybe_elements = AllocateFixedArray(2); |
| 1908 | if (!maybe_elements->ToObject(&elements)) return false; |
| 1909 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1910 | FixedArray::cast(elements)->set(0, Smi::FromInt(0)); |
| 1911 | JSObject::cast(obj)->set_elements(FixedArray::cast(elements)); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1912 | set_message_listeners(JSObject::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1913 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1914 | return true; |
| 1915 | } |
| 1916 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1917 | |
| 1918 | void Heap::CreateCEntryStub() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 1919 | CEntryStub stub(1); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1920 | set_c_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1921 | } |
| 1922 | |
| 1923 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1924 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1925 | void Heap::CreateRegExpCEntryStub() { |
| 1926 | RegExpCEntryStub stub; |
| 1927 | set_re_c_entry_code(*stub.GetCode()); |
| 1928 | } |
| 1929 | #endif |
| 1930 | |
| 1931 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1932 | void Heap::CreateJSEntryStub() { |
| 1933 | JSEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1934 | set_js_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1935 | } |
| 1936 | |
| 1937 | |
| 1938 | void Heap::CreateJSConstructEntryStub() { |
| 1939 | JSConstructEntryStub stub; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1940 | set_js_construct_entry_code(*stub.GetCode()); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1941 | } |
| 1942 | |
| 1943 | |
ricow@chromium.org | 83aa549 | 2011-02-07 12:42:56 +0000 | [diff] [blame] | 1944 | #if V8_TARGET_ARCH_ARM |
| 1945 | void Heap::CreateDirectCEntryStub() { |
| 1946 | DirectCEntryStub stub; |
| 1947 | set_direct_c_entry_code(*stub.GetCode()); |
| 1948 | } |
| 1949 | #endif |
| 1950 | |
| 1951 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1952 | void Heap::CreateFixedStubs() { |
| 1953 | // Here we create roots for fixed stubs. They are needed at GC |
| 1954 | // for cooking and uncooking (check out frames.cc). |
| 1955 | // The eliminates the need for doing dictionary lookup in the |
| 1956 | // stub cache for these stubs. |
| 1957 | HandleScope scope; |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1958 | // gcc-4.4 has problem generating correct code of following snippet: |
| 1959 | // { CEntryStub stub; |
| 1960 | // c_entry_code_ = *stub.GetCode(); |
| 1961 | // } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1962 | // { DebuggerStatementStub stub; |
| 1963 | // debugger_statement_code_ = *stub.GetCode(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1964 | // } |
| 1965 | // To workaround the problem, make separate functions without inlining. |
| 1966 | Heap::CreateCEntryStub(); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 1967 | Heap::CreateJSEntryStub(); |
| 1968 | Heap::CreateJSConstructEntryStub(); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1969 | #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1970 | Heap::CreateRegExpCEntryStub(); |
| 1971 | #endif |
ricow@chromium.org | 83aa549 | 2011-02-07 12:42:56 +0000 | [diff] [blame] | 1972 | #if V8_TARGET_ARCH_ARM |
| 1973 | Heap::CreateDirectCEntryStub(); |
| 1974 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1975 | } |
| 1976 | |
| 1977 | |
| 1978 | bool Heap::CreateInitialObjects() { |
| 1979 | Object* obj; |
| 1980 | |
| 1981 | // The -0 value must be set before NumberFromDouble works. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1982 | { MaybeObject* maybe_obj = AllocateHeapNumber(-0.0, TENURED); |
| 1983 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1984 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1985 | set_minus_zero_value(obj); |
| 1986 | ASSERT(signbit(minus_zero_value()->Number()) != 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1987 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1988 | { MaybeObject* maybe_obj = AllocateHeapNumber(OS::nan_value(), TENURED); |
| 1989 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1990 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1991 | set_nan_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1992 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1993 | { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_DATA_SPACE); |
| 1994 | if (!maybe_obj->ToObject(&obj)) return false; |
| 1995 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1996 | set_undefined_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1997 | ASSERT(!InNewSpace(undefined_value())); |
| 1998 | |
| 1999 | // Allocate initial symbol table. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2000 | { MaybeObject* maybe_obj = SymbolTable::Allocate(kInitialSymbolTableSize); |
| 2001 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2002 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2003 | // Don't use set_symbol_table() due to asserts. |
| 2004 | roots_[kSymbolTableRootIndex] = obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2005 | |
| 2006 | // Assign the print strings for oddballs after creating symboltable. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2007 | Object* symbol; |
| 2008 | { MaybeObject* maybe_symbol = LookupAsciiSymbol("undefined"); |
| 2009 | if (!maybe_symbol->ToObject(&symbol)) return false; |
| 2010 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2011 | Oddball::cast(undefined_value())->set_to_string(String::cast(symbol)); |
| 2012 | Oddball::cast(undefined_value())->set_to_number(nan_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2013 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2014 | // Allocate the null_value |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2015 | { MaybeObject* maybe_obj = |
| 2016 | Oddball::cast(null_value())->Initialize("null", Smi::FromInt(0)); |
| 2017 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2018 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2019 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2020 | { MaybeObject* maybe_obj = CreateOddball("true", Smi::FromInt(1)); |
| 2021 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2022 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2023 | set_true_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2024 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2025 | { MaybeObject* maybe_obj = CreateOddball("false", Smi::FromInt(0)); |
| 2026 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2027 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2028 | set_false_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2029 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2030 | { MaybeObject* maybe_obj = CreateOddball("hole", Smi::FromInt(-1)); |
| 2031 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2032 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2033 | set_the_hole_value(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2034 | |
kmillikin@chromium.org | d2c22f0 | 2011-01-10 08:15:37 +0000 | [diff] [blame] | 2035 | { MaybeObject* maybe_obj = CreateOddball("arguments_marker", |
| 2036 | Smi::FromInt(-4)); |
| 2037 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2038 | } |
| 2039 | set_arguments_marker(obj); |
| 2040 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2041 | { MaybeObject* maybe_obj = |
| 2042 | CreateOddball("no_interceptor_result_sentinel", Smi::FromInt(-2)); |
| 2043 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2044 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2045 | set_no_interceptor_result_sentinel(obj); |
| 2046 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2047 | { MaybeObject* maybe_obj = |
| 2048 | CreateOddball("termination_exception", Smi::FromInt(-3)); |
| 2049 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2050 | } |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 2051 | set_termination_exception(obj); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2052 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2053 | // Allocate the empty string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2054 | { MaybeObject* maybe_obj = AllocateRawAsciiString(0, TENURED); |
| 2055 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2056 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2057 | set_empty_string(String::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2058 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2059 | for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2060 | { MaybeObject* maybe_obj = |
| 2061 | LookupAsciiSymbol(constant_symbol_table[i].contents); |
| 2062 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2063 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2064 | roots_[constant_symbol_table[i].index] = String::cast(obj); |
| 2065 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2066 | |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2067 | // Allocate the hidden symbol which is used to identify the hidden properties |
| 2068 | // in JSObjects. The hash code has a special value so that it will not match |
| 2069 | // 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] | 2070 | // 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] | 2071 | // hash code in place. The hash code for the hidden_symbol is zero to ensure |
| 2072 | // that it will always be at the first entry in property descriptors. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2073 | { MaybeObject* maybe_obj = |
| 2074 | AllocateSymbol(CStrVector(""), 0, String::kZeroHash); |
| 2075 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2076 | } |
ager@chromium.org | 3b45ab5 | 2009-03-19 22:21:34 +0000 | [diff] [blame] | 2077 | hidden_symbol_ = String::cast(obj); |
| 2078 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2079 | // Allocate the proxy for __proto__. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2080 | { MaybeObject* maybe_obj = |
| 2081 | AllocateProxy((Address) &Accessors::ObjectPrototype); |
| 2082 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2083 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2084 | set_prototype_accessors(Proxy::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2085 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2086 | // Allocate the code_stubs dictionary. The initial size is set to avoid |
| 2087 | // expanding the dictionary during bootstrapping. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2088 | { MaybeObject* maybe_obj = NumberDictionary::Allocate(128); |
| 2089 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2090 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2091 | set_code_stubs(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2092 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2093 | // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size |
| 2094 | // is set to avoid expanding the dictionary during bootstrapping. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2095 | { MaybeObject* maybe_obj = NumberDictionary::Allocate(64); |
| 2096 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2097 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2098 | set_non_monomorphic_cache(NumberDictionary::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2099 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 2100 | set_instanceof_cache_function(Smi::FromInt(0)); |
| 2101 | set_instanceof_cache_map(Smi::FromInt(0)); |
| 2102 | set_instanceof_cache_answer(Smi::FromInt(0)); |
| 2103 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2104 | CreateFixedStubs(); |
| 2105 | |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2106 | // Allocate the dictionary of intrinsic function names. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2107 | { MaybeObject* maybe_obj = StringDictionary::Allocate(Runtime::kNumFunctions); |
| 2108 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2109 | } |
| 2110 | { MaybeObject* maybe_obj = Runtime::InitializeIntrinsicFunctionNames(obj); |
| 2111 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2112 | } |
erik.corry@gmail.com | d88afa2 | 2010-09-15 12:33:05 +0000 | [diff] [blame] | 2113 | set_intrinsic_function_names(StringDictionary::cast(obj)); |
| 2114 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2115 | if (InitializeNumberStringCache()->IsFailure()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2116 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 2117 | // Allocate cache for single character ASCII strings. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2118 | { MaybeObject* maybe_obj = |
| 2119 | AllocateFixedArray(String::kMaxAsciiCharCode + 1, TENURED); |
| 2120 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2121 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2122 | set_single_character_string_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2123 | |
| 2124 | // Allocate cache for external strings pointing to native source code. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2125 | { MaybeObject* maybe_obj = AllocateFixedArray(Natives::GetBuiltinsCount()); |
| 2126 | if (!maybe_obj->ToObject(&obj)) return false; |
| 2127 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2128 | set_natives_source_cache(FixedArray::cast(obj)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2129 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 2130 | // Handling of script id generation is in Factory::NewScript. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2131 | set_last_script_id(undefined_value()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 2132 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2133 | // Initialize keyed lookup cache. |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2134 | KeyedLookupCache::Clear(); |
| 2135 | |
| 2136 | // Initialize context slot cache. |
| 2137 | ContextSlotCache::Clear(); |
| 2138 | |
| 2139 | // Initialize descriptor cache. |
| 2140 | DescriptorLookupCache::Clear(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2141 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 2142 | // Initialize compilation cache. |
| 2143 | CompilationCache::Clear(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2144 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2145 | return true; |
| 2146 | } |
| 2147 | |
| 2148 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2149 | MaybeObject* Heap::InitializeNumberStringCache() { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2150 | // Compute the size of the number string cache based on the max heap size. |
| 2151 | // max_semispace_size_ == 512 KB => number_string_cache_size = 32. |
| 2152 | // max_semispace_size_ == 8 MB => number_string_cache_size = 16KB. |
| 2153 | int number_string_cache_size = max_semispace_size_ / 512; |
| 2154 | number_string_cache_size = Max(32, Min(16*KB, number_string_cache_size)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2155 | Object* obj; |
| 2156 | MaybeObject* maybe_obj = |
| 2157 | AllocateFixedArray(number_string_cache_size * 2, TENURED); |
| 2158 | if (maybe_obj->ToObject(&obj)) set_number_string_cache(FixedArray::cast(obj)); |
| 2159 | return maybe_obj; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2160 | } |
| 2161 | |
| 2162 | |
| 2163 | void Heap::FlushNumberStringCache() { |
| 2164 | // Flush the number to string cache. |
| 2165 | int len = number_string_cache()->length(); |
| 2166 | for (int i = 0; i < len; i++) { |
| 2167 | number_string_cache()->set_undefined(i); |
| 2168 | } |
| 2169 | } |
| 2170 | |
| 2171 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2172 | static inline int double_get_hash(double d) { |
| 2173 | DoubleRepresentation rep(d); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2174 | 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] | 2175 | } |
| 2176 | |
| 2177 | |
| 2178 | static inline int smi_get_hash(Smi* smi) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2179 | return smi->value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2180 | } |
| 2181 | |
| 2182 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2183 | Object* Heap::GetNumberStringCache(Object* number) { |
| 2184 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2185 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2186 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2187 | hash = smi_get_hash(Smi::cast(number)) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2188 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2189 | hash = double_get_hash(number->Number()) & mask; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2190 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2191 | Object* key = number_string_cache()->get(hash * 2); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2192 | if (key == number) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2193 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2194 | } else if (key->IsHeapNumber() && |
| 2195 | number->IsHeapNumber() && |
| 2196 | key->Number() == number->Number()) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2197 | return String::cast(number_string_cache()->get(hash * 2 + 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2198 | } |
| 2199 | return undefined_value(); |
| 2200 | } |
| 2201 | |
| 2202 | |
| 2203 | void Heap::SetNumberStringCache(Object* number, String* string) { |
| 2204 | int hash; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2205 | int mask = (number_string_cache()->length() >> 1) - 1; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2206 | if (number->IsSmi()) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2207 | hash = smi_get_hash(Smi::cast(number)) & mask; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2208 | number_string_cache()->set(hash * 2, Smi::cast(number)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2209 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2210 | hash = double_get_hash(number->Number()) & mask; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2211 | number_string_cache()->set(hash * 2, number); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2212 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 2213 | number_string_cache()->set(hash * 2 + 1, string); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2214 | } |
| 2215 | |
| 2216 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2217 | MaybeObject* Heap::NumberToString(Object* number, |
| 2218 | bool check_number_string_cache) { |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 2219 | Counters::number_to_string_runtime.Increment(); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 2220 | if (check_number_string_cache) { |
| 2221 | Object* cached = GetNumberStringCache(number); |
| 2222 | if (cached != undefined_value()) { |
| 2223 | return cached; |
| 2224 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2225 | } |
| 2226 | |
| 2227 | char arr[100]; |
| 2228 | Vector<char> buffer(arr, ARRAY_SIZE(arr)); |
| 2229 | const char* str; |
| 2230 | if (number->IsSmi()) { |
| 2231 | int num = Smi::cast(number)->value(); |
| 2232 | str = IntToCString(num, buffer); |
| 2233 | } else { |
| 2234 | double num = HeapNumber::cast(number)->value(); |
| 2235 | str = DoubleToCString(num, buffer); |
| 2236 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2237 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2238 | Object* js_string; |
| 2239 | MaybeObject* maybe_js_string = AllocateStringFromAscii(CStrVector(str)); |
| 2240 | if (maybe_js_string->ToObject(&js_string)) { |
| 2241 | SetNumberStringCache(number, String::cast(js_string)); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2242 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2243 | return maybe_js_string; |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2244 | } |
| 2245 | |
| 2246 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2247 | Map* Heap::MapForExternalArrayType(ExternalArrayType array_type) { |
| 2248 | return Map::cast(roots_[RootIndexForExternalArrayType(array_type)]); |
| 2249 | } |
| 2250 | |
| 2251 | |
| 2252 | Heap::RootListIndex Heap::RootIndexForExternalArrayType( |
| 2253 | ExternalArrayType array_type) { |
| 2254 | switch (array_type) { |
| 2255 | case kExternalByteArray: |
| 2256 | return kExternalByteArrayMapRootIndex; |
| 2257 | case kExternalUnsignedByteArray: |
| 2258 | return kExternalUnsignedByteArrayMapRootIndex; |
| 2259 | case kExternalShortArray: |
| 2260 | return kExternalShortArrayMapRootIndex; |
| 2261 | case kExternalUnsignedShortArray: |
| 2262 | return kExternalUnsignedShortArrayMapRootIndex; |
| 2263 | case kExternalIntArray: |
| 2264 | return kExternalIntArrayMapRootIndex; |
| 2265 | case kExternalUnsignedIntArray: |
| 2266 | return kExternalUnsignedIntArrayMapRootIndex; |
| 2267 | case kExternalFloatArray: |
| 2268 | return kExternalFloatArrayMapRootIndex; |
| 2269 | default: |
| 2270 | UNREACHABLE(); |
| 2271 | return kUndefinedValueRootIndex; |
| 2272 | } |
| 2273 | } |
| 2274 | |
| 2275 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2276 | MaybeObject* Heap::NumberFromDouble(double value, PretenureFlag pretenure) { |
kmillikin@chromium.org | 4111b80 | 2010-05-03 10:34:42 +0000 | [diff] [blame] | 2277 | // We need to distinguish the minus zero value and this cannot be |
| 2278 | // done after conversion to int. Doing this by comparing bit |
| 2279 | // patterns is faster than using fpclassify() et al. |
| 2280 | static const DoubleRepresentation minus_zero(-0.0); |
| 2281 | |
| 2282 | DoubleRepresentation rep(value); |
| 2283 | if (rep.bits == minus_zero.bits) { |
| 2284 | return AllocateHeapNumber(-0.0, pretenure); |
| 2285 | } |
| 2286 | |
| 2287 | int int_value = FastD2I(value); |
| 2288 | if (value == int_value && Smi::IsValid(int_value)) { |
| 2289 | return Smi::FromInt(int_value); |
| 2290 | } |
| 2291 | |
| 2292 | // Materialize the value in the heap. |
| 2293 | return AllocateHeapNumber(value, pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2294 | } |
| 2295 | |
| 2296 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2297 | MaybeObject* Heap::AllocateProxy(Address proxy, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2298 | // Statically ensure that it is safe to allocate proxies in paged spaces. |
| 2299 | STATIC_ASSERT(Proxy::kSize <= Page::kMaxHeapObjectSize); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2300 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2301 | Object* result; |
| 2302 | { MaybeObject* maybe_result = Allocate(proxy_map(), space); |
| 2303 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2304 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2305 | |
| 2306 | Proxy::cast(result)->set_proxy(proxy); |
| 2307 | return result; |
| 2308 | } |
| 2309 | |
| 2310 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2311 | MaybeObject* Heap::AllocateSharedFunctionInfo(Object* name) { |
| 2312 | Object* result; |
| 2313 | { MaybeObject* maybe_result = |
| 2314 | Allocate(shared_function_info_map(), OLD_POINTER_SPACE); |
| 2315 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2316 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2317 | |
| 2318 | SharedFunctionInfo* share = SharedFunctionInfo::cast(result); |
| 2319 | share->set_name(name); |
| 2320 | Code* illegal = Builtins::builtin(Builtins::Illegal); |
| 2321 | share->set_code(illegal); |
ager@chromium.org | b573749 | 2010-07-15 09:29:43 +0000 | [diff] [blame] | 2322 | share->set_scope_info(SerializedScopeInfo::Empty()); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2323 | Code* construct_stub = Builtins::builtin(Builtins::JSConstructStubGeneric); |
| 2324 | share->set_construct_stub(construct_stub); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2325 | share->set_expected_nof_properties(0); |
| 2326 | share->set_length(0); |
| 2327 | share->set_formal_parameter_count(0); |
| 2328 | share->set_instance_class_name(Object_symbol()); |
| 2329 | share->set_function_data(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2330 | share->set_script(undefined_value()); |
| 2331 | share->set_start_position_and_type(0); |
| 2332 | share->set_debug_info(undefined_value()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 2333 | share->set_inferred_name(empty_string()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2334 | share->set_compiler_hints(0); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2335 | share->set_deopt_counter(Smi::FromInt(FLAG_deopt_every_n_times)); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 2336 | share->set_initial_map(undefined_value()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 2337 | share->set_this_property_assignments_count(0); |
| 2338 | share->set_this_property_assignments(undefined_value()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2339 | share->set_opt_count(0); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2340 | share->set_num_literals(0); |
| 2341 | share->set_end_position(0); |
| 2342 | share->set_function_token_position(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2343 | return result; |
| 2344 | } |
| 2345 | |
| 2346 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 2347 | MaybeObject* Heap::AllocateJSMessageObject(String* type, |
| 2348 | JSArray* arguments, |
| 2349 | int start_position, |
| 2350 | int end_position, |
| 2351 | Object* script, |
| 2352 | Object* stack_trace, |
| 2353 | Object* stack_frames) { |
| 2354 | Object* result; |
| 2355 | { MaybeObject* maybe_result = Allocate(message_object_map(), NEW_SPACE); |
| 2356 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2357 | } |
| 2358 | JSMessageObject* message = JSMessageObject::cast(result); |
| 2359 | message->set_properties(Heap::empty_fixed_array()); |
| 2360 | message->set_elements(Heap::empty_fixed_array()); |
| 2361 | message->set_type(type); |
| 2362 | message->set_arguments(arguments); |
| 2363 | message->set_start_position(start_position); |
| 2364 | message->set_end_position(end_position); |
| 2365 | message->set_script(script); |
| 2366 | message->set_stack_trace(stack_trace); |
| 2367 | message->set_stack_frames(stack_frames); |
| 2368 | return result; |
| 2369 | } |
| 2370 | |
| 2371 | |
| 2372 | |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2373 | // Returns true for a character in a range. Both limits are inclusive. |
| 2374 | static inline bool Between(uint32_t character, uint32_t from, uint32_t to) { |
| 2375 | // This makes uses of the the unsigned wraparound. |
| 2376 | return character - from <= to - from; |
| 2377 | } |
| 2378 | |
| 2379 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2380 | MUST_USE_RESULT static inline MaybeObject* MakeOrFindTwoCharacterString( |
| 2381 | uint32_t c1, |
| 2382 | uint32_t c2) { |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2383 | String* symbol; |
| 2384 | // Numeric strings have a different hash algorithm not known by |
| 2385 | // LookupTwoCharsSymbolIfExists, so we skip this step for such strings. |
| 2386 | if ((!Between(c1, '0', '9') || !Between(c2, '0', '9')) && |
| 2387 | Heap::symbol_table()->LookupTwoCharsSymbolIfExists(c1, c2, &symbol)) { |
| 2388 | return symbol; |
| 2389 | // Now we know the length is 2, we might as well make use of that fact |
| 2390 | // when building the new string. |
| 2391 | } else if ((c1 | c2) <= String::kMaxAsciiCharCodeU) { // We can do this |
| 2392 | ASSERT(IsPowerOf2(String::kMaxAsciiCharCodeU + 1)); // because of this. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2393 | Object* result; |
| 2394 | { MaybeObject* maybe_result = Heap::AllocateRawAsciiString(2); |
| 2395 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2396 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2397 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2398 | dest[0] = c1; |
| 2399 | dest[1] = c2; |
| 2400 | return result; |
| 2401 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2402 | Object* result; |
| 2403 | { MaybeObject* maybe_result = Heap::AllocateRawTwoByteString(2); |
| 2404 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2405 | } |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2406 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
| 2407 | dest[0] = c1; |
| 2408 | dest[1] = c2; |
| 2409 | return result; |
| 2410 | } |
| 2411 | } |
| 2412 | |
| 2413 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2414 | MaybeObject* Heap::AllocateConsString(String* first, String* second) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2415 | int first_length = first->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2416 | if (first_length == 0) { |
| 2417 | return second; |
| 2418 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2419 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2420 | int second_length = second->length(); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2421 | if (second_length == 0) { |
| 2422 | return first; |
| 2423 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2424 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2425 | int length = first_length + second_length; |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2426 | |
| 2427 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2428 | // dictionary. Check whether we already have the string in the symbol |
| 2429 | // table to prevent creation of many unneccesary strings. |
| 2430 | if (length == 2) { |
| 2431 | unsigned c1 = first->Get(0); |
| 2432 | unsigned c2 = second->Get(0); |
| 2433 | return MakeOrFindTwoCharacterString(c1, c2); |
| 2434 | } |
| 2435 | |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2436 | bool first_is_ascii = first->IsAsciiRepresentation(); |
| 2437 | bool second_is_ascii = second->IsAsciiRepresentation(); |
| 2438 | bool is_ascii = first_is_ascii && second_is_ascii; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2439 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2440 | // 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] | 2441 | // of the new cons string is too large. |
| 2442 | if (length > String::kMaxLength || length < 0) { |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2443 | Top::context()->mark_out_of_memory(); |
| 2444 | return Failure::OutOfMemoryException(); |
| 2445 | } |
| 2446 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2447 | bool is_ascii_data_in_two_byte_string = false; |
| 2448 | if (!is_ascii) { |
| 2449 | // At least one of the strings uses two-byte representation so we |
| 2450 | // can't use the fast case code for short ascii strings below, but |
| 2451 | // we can try to save memory if all chars actually fit in ascii. |
| 2452 | is_ascii_data_in_two_byte_string = |
| 2453 | first->HasOnlyAsciiChars() && second->HasOnlyAsciiChars(); |
| 2454 | if (is_ascii_data_in_two_byte_string) { |
| 2455 | Counters::string_add_runtime_ext_to_ascii.Increment(); |
| 2456 | } |
| 2457 | } |
| 2458 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2459 | // If the resulting string is small make a flat string. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2460 | if (length < String::kMinNonFlatLength) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2461 | ASSERT(first->IsFlat()); |
| 2462 | ASSERT(second->IsFlat()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2463 | if (is_ascii) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2464 | Object* result; |
| 2465 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2466 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2467 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2468 | // Copy the characters into the new object. |
| 2469 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2470 | // Copy first part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2471 | const char* src; |
| 2472 | if (first->IsExternalString()) { |
| 2473 | src = ExternalAsciiString::cast(first)->resource()->data(); |
| 2474 | } else { |
| 2475 | src = SeqAsciiString::cast(first)->GetChars(); |
| 2476 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2477 | for (int i = 0; i < first_length; i++) *dest++ = src[i]; |
| 2478 | // Copy second part. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2479 | if (second->IsExternalString()) { |
| 2480 | src = ExternalAsciiString::cast(second)->resource()->data(); |
| 2481 | } else { |
| 2482 | src = SeqAsciiString::cast(second)->GetChars(); |
| 2483 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 2484 | for (int i = 0; i < second_length; i++) *dest++ = src[i]; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2485 | return result; |
| 2486 | } else { |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2487 | if (is_ascii_data_in_two_byte_string) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2488 | Object* result; |
| 2489 | { MaybeObject* maybe_result = AllocateRawAsciiString(length); |
| 2490 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2491 | } |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2492 | // Copy the characters into the new object. |
| 2493 | char* dest = SeqAsciiString::cast(result)->GetChars(); |
| 2494 | String::WriteToFlat(first, dest, 0, first_length); |
| 2495 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
ricow@chromium.org | aa1b616 | 2010-03-29 07:44:58 +0000 | [diff] [blame] | 2496 | return result; |
| 2497 | } |
| 2498 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2499 | Object* result; |
| 2500 | { MaybeObject* maybe_result = AllocateRawTwoByteString(length); |
| 2501 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2502 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2503 | // Copy the characters into the new object. |
| 2504 | uc16* dest = SeqTwoByteString::cast(result)->GetChars(); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2505 | String::WriteToFlat(first, dest, 0, first_length); |
| 2506 | String::WriteToFlat(second, dest + first_length, 0, second_length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2507 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2508 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2509 | } |
| 2510 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2511 | Map* map = (is_ascii || is_ascii_data_in_two_byte_string) ? |
| 2512 | cons_ascii_string_map() : cons_string_map(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2513 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2514 | Object* result; |
| 2515 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2516 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2517 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2518 | |
| 2519 | AssertNoAllocation no_gc; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2520 | ConsString* cons_string = ConsString::cast(result); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2521 | WriteBarrierMode mode = cons_string->GetWriteBarrierMode(no_gc); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2522 | cons_string->set_length(length); |
| 2523 | cons_string->set_hash_field(String::kEmptyHashField); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2524 | cons_string->set_first(first, mode); |
| 2525 | cons_string->set_second(second, mode); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2526 | return result; |
| 2527 | } |
| 2528 | |
| 2529 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2530 | MaybeObject* Heap::AllocateSubString(String* buffer, |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2531 | int start, |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 2532 | int end, |
| 2533 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2534 | int length = end - start; |
| 2535 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2536 | if (length == 1) { |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2537 | return Heap::LookupSingleCharacterStringFromCode( |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2538 | buffer->Get(start)); |
ager@chromium.org | 6141cbe | 2009-11-20 12:14:52 +0000 | [diff] [blame] | 2539 | } else if (length == 2) { |
| 2540 | // Optimization for 2-byte strings often used as keys in a decompression |
| 2541 | // dictionary. Check whether we already have the string in the symbol |
| 2542 | // table to prevent creation of many unneccesary strings. |
| 2543 | unsigned c1 = buffer->Get(start); |
| 2544 | unsigned c2 = buffer->Get(start + 1); |
| 2545 | return MakeOrFindTwoCharacterString(c1, c2); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 2546 | } |
| 2547 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2548 | // 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] | 2549 | buffer = buffer->TryFlattenGetString(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2550 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2551 | Object* result; |
| 2552 | { MaybeObject* maybe_result = buffer->IsAsciiRepresentation() |
| 2553 | ? AllocateRawAsciiString(length, pretenure ) |
| 2554 | : AllocateRawTwoByteString(length, pretenure); |
| 2555 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2556 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2557 | String* string_result = String::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2558 | // Copy the characters into the new object. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2559 | if (buffer->IsAsciiRepresentation()) { |
| 2560 | ASSERT(string_result->IsAsciiRepresentation()); |
| 2561 | char* dest = SeqAsciiString::cast(string_result)->GetChars(); |
| 2562 | String::WriteToFlat(buffer, dest, start, end); |
| 2563 | } else { |
| 2564 | ASSERT(string_result->IsTwoByteRepresentation()); |
| 2565 | uc16* dest = SeqTwoByteString::cast(string_result)->GetChars(); |
| 2566 | String::WriteToFlat(buffer, dest, start, end); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2567 | } |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2568 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2569 | return result; |
| 2570 | } |
| 2571 | |
| 2572 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2573 | MaybeObject* Heap::AllocateExternalStringFromAscii( |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2574 | ExternalAsciiString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2575 | size_t length = resource->length(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2576 | if (length > static_cast<size_t>(String::kMaxLength)) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2577 | Top::context()->mark_out_of_memory(); |
| 2578 | return Failure::OutOfMemoryException(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2579 | } |
| 2580 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2581 | Map* map = external_ascii_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2582 | Object* result; |
| 2583 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2584 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2585 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2586 | |
| 2587 | ExternalAsciiString* external_string = ExternalAsciiString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2588 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2589 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2590 | external_string->set_resource(resource); |
| 2591 | |
| 2592 | return result; |
| 2593 | } |
| 2594 | |
| 2595 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2596 | MaybeObject* Heap::AllocateExternalStringFromTwoByte( |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2597 | ExternalTwoByteString::Resource* resource) { |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2598 | size_t length = resource->length(); |
| 2599 | if (length > static_cast<size_t>(String::kMaxLength)) { |
| 2600 | Top::context()->mark_out_of_memory(); |
| 2601 | return Failure::OutOfMemoryException(); |
| 2602 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2603 | |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2604 | // For small strings we check whether the resource contains only |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 2605 | // ASCII characters. If yes, we use a different string map. |
| 2606 | static const size_t kAsciiCheckLengthLimit = 32; |
| 2607 | bool is_ascii = length <= kAsciiCheckLengthLimit && |
| 2608 | String::IsAscii(resource->data(), static_cast<int>(length)); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 2609 | Map* map = is_ascii ? |
| 2610 | Heap::external_string_with_ascii_data_map() : Heap::external_string_map(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2611 | Object* result; |
| 2612 | { MaybeObject* maybe_result = Allocate(map, NEW_SPACE); |
| 2613 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2614 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2615 | |
| 2616 | ExternalTwoByteString* external_string = ExternalTwoByteString::cast(result); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2617 | external_string->set_length(static_cast<int>(length)); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 2618 | external_string->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2619 | external_string->set_resource(resource); |
| 2620 | |
| 2621 | return result; |
| 2622 | } |
| 2623 | |
| 2624 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2625 | MaybeObject* Heap::LookupSingleCharacterStringFromCode(uint16_t code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2626 | if (code <= String::kMaxAsciiCharCode) { |
| 2627 | Object* value = Heap::single_character_string_cache()->get(code); |
| 2628 | if (value != Heap::undefined_value()) return value; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2629 | |
| 2630 | char buffer[1]; |
| 2631 | buffer[0] = static_cast<char>(code); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2632 | Object* result; |
| 2633 | MaybeObject* maybe_result = LookupSymbol(Vector<const char>(buffer, 1)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2634 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2635 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2636 | Heap::single_character_string_cache()->set(code, result); |
| 2637 | return result; |
| 2638 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2639 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2640 | Object* result; |
| 2641 | { MaybeObject* maybe_result = Heap::AllocateRawTwoByteString(1); |
| 2642 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2643 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2644 | String* answer = String::cast(result); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 2645 | answer->Set(0, code); |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 2646 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2647 | } |
| 2648 | |
| 2649 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2650 | MaybeObject* Heap::AllocateByteArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2651 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 2652 | return Failure::OutOfMemoryException(); |
| 2653 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2654 | if (pretenure == NOT_TENURED) { |
| 2655 | return AllocateByteArray(length); |
| 2656 | } |
| 2657 | int size = ByteArray::SizeFor(length); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2658 | Object* result; |
| 2659 | { MaybeObject* maybe_result = (size <= MaxObjectSizeInPagedSpace()) |
| 2660 | ? old_data_space_->AllocateRaw(size) |
| 2661 | : lo_space_->AllocateRaw(size); |
| 2662 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2663 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2664 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2665 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 2666 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2667 | return result; |
| 2668 | } |
| 2669 | |
| 2670 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2671 | MaybeObject* Heap::AllocateByteArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2672 | if (length < 0 || length > ByteArray::kMaxLength) { |
| 2673 | return Failure::OutOfMemoryException(); |
| 2674 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2675 | int size = ByteArray::SizeFor(length); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2676 | AllocationSpace space = |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2677 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2678 | Object* result; |
| 2679 | { MaybeObject* maybe_result = AllocateRaw(size, space, OLD_DATA_SPACE); |
| 2680 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2681 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2682 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2683 | reinterpret_cast<ByteArray*>(result)->set_map(byte_array_map()); |
| 2684 | reinterpret_cast<ByteArray*>(result)->set_length(length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2685 | return result; |
| 2686 | } |
| 2687 | |
| 2688 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2689 | void Heap::CreateFillerObjectAt(Address addr, int size) { |
| 2690 | if (size == 0) return; |
| 2691 | HeapObject* filler = HeapObject::FromAddress(addr); |
| 2692 | if (size == kPointerSize) { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2693 | filler->set_map(one_pointer_filler_map()); |
| 2694 | } else if (size == 2 * kPointerSize) { |
| 2695 | filler->set_map(two_pointer_filler_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2696 | } else { |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2697 | filler->set_map(byte_array_map()); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 2698 | ByteArray::cast(filler)->set_length(ByteArray::LengthFor(size)); |
| 2699 | } |
| 2700 | } |
| 2701 | |
| 2702 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2703 | MaybeObject* Heap::AllocatePixelArray(int length, |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2704 | uint8_t* external_pointer, |
| 2705 | PretenureFlag pretenure) { |
| 2706 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2707 | Object* result; |
| 2708 | { MaybeObject* maybe_result = |
| 2709 | AllocateRaw(PixelArray::kAlignedSize, space, OLD_DATA_SPACE); |
| 2710 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2711 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 2712 | |
| 2713 | reinterpret_cast<PixelArray*>(result)->set_map(pixel_array_map()); |
| 2714 | reinterpret_cast<PixelArray*>(result)->set_length(length); |
| 2715 | reinterpret_cast<PixelArray*>(result)->set_external_pointer(external_pointer); |
| 2716 | |
| 2717 | return result; |
| 2718 | } |
| 2719 | |
| 2720 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2721 | MaybeObject* Heap::AllocateExternalArray(int length, |
| 2722 | ExternalArrayType array_type, |
| 2723 | void* external_pointer, |
| 2724 | PretenureFlag pretenure) { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2725 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2726 | Object* result; |
| 2727 | { MaybeObject* maybe_result = AllocateRaw(ExternalArray::kAlignedSize, |
| 2728 | space, |
| 2729 | OLD_DATA_SPACE); |
| 2730 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2731 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2732 | |
| 2733 | reinterpret_cast<ExternalArray*>(result)->set_map( |
| 2734 | MapForExternalArrayType(array_type)); |
| 2735 | reinterpret_cast<ExternalArray*>(result)->set_length(length); |
| 2736 | reinterpret_cast<ExternalArray*>(result)->set_external_pointer( |
| 2737 | external_pointer); |
| 2738 | |
| 2739 | return result; |
| 2740 | } |
| 2741 | |
| 2742 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2743 | MaybeObject* Heap::CreateCode(const CodeDesc& desc, |
| 2744 | Code::Flags flags, |
| 2745 | Handle<Object> self_reference) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2746 | // Allocate ByteArray before the Code object, so that we do not risk |
| 2747 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2748 | Object* reloc_info; |
| 2749 | { MaybeObject* maybe_reloc_info = AllocateByteArray(desc.reloc_size, TENURED); |
| 2750 | if (!maybe_reloc_info->ToObject(&reloc_info)) return maybe_reloc_info; |
| 2751 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2752 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2753 | // Compute size |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2754 | int body_size = RoundUp(desc.instr_size, kObjectAlignment); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 2755 | int obj_size = Code::SizeFor(body_size); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 2756 | ASSERT(IsAligned(static_cast<intptr_t>(obj_size), kCodeAlignment)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2757 | MaybeObject* maybe_result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2758 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2759 | maybe_result = lo_space_->AllocateRawCode(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2760 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2761 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2762 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2763 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2764 | Object* result; |
| 2765 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2766 | |
| 2767 | // Initialize the object |
| 2768 | HeapObject::cast(result)->set_map(code_map()); |
| 2769 | Code* code = Code::cast(result); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2770 | ASSERT(!CodeRange::exists() || CodeRange::contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2771 | code->set_instruction_size(desc.instr_size); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2772 | code->set_relocation_info(ByteArray::cast(reloc_info)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2773 | code->set_flags(flags); |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 2774 | if (code->is_call_stub() || code->is_keyed_call_stub()) { |
| 2775 | code->set_check_type(RECEIVER_MAP_CHECK); |
| 2776 | } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2777 | code->set_deoptimization_data(empty_fixed_array()); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 2778 | // Allow self references to created code object by patching the handle to |
| 2779 | // point to the newly allocated Code object. |
| 2780 | if (!self_reference.is_null()) { |
| 2781 | *(self_reference.location()) = code; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 2782 | } |
| 2783 | // Migrate generated code. |
| 2784 | // The generated code can contain Object** values (typically from handles) |
| 2785 | // that are dereferenced during the copy to point directly to the actual heap |
| 2786 | // objects. These pointers can include references to the code object itself, |
| 2787 | // through the self_reference parameter. |
| 2788 | code->CopyFrom(desc); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2789 | |
| 2790 | #ifdef DEBUG |
| 2791 | code->Verify(); |
| 2792 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2793 | return code; |
| 2794 | } |
| 2795 | |
| 2796 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2797 | MaybeObject* Heap::CopyCode(Code* code) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2798 | // Allocate an object the same size as the code object. |
| 2799 | int obj_size = code->Size(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2800 | MaybeObject* maybe_result; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 2801 | if (obj_size > MaxObjectSizeInPagedSpace()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2802 | maybe_result = lo_space_->AllocateRawCode(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2803 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2804 | maybe_result = code_space_->AllocateRaw(obj_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2805 | } |
| 2806 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2807 | Object* result; |
| 2808 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2809 | |
| 2810 | // Copy code object. |
| 2811 | Address old_addr = code->address(); |
| 2812 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2813 | CopyBlock(new_addr, old_addr, obj_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2814 | // Relocate the copy. |
| 2815 | Code* new_code = Code::cast(result); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2816 | ASSERT(!CodeRange::exists() || CodeRange::contains(code->address())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2817 | new_code->Relocate(new_addr - old_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2818 | return new_code; |
| 2819 | } |
| 2820 | |
| 2821 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2822 | MaybeObject* Heap::CopyCode(Code* code, Vector<byte> reloc_info) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2823 | // Allocate ByteArray before the Code object, so that we do not risk |
| 2824 | // leaving uninitialized Code object (and breaking the heap). |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2825 | Object* reloc_info_array; |
| 2826 | { MaybeObject* maybe_reloc_info_array = |
| 2827 | AllocateByteArray(reloc_info.length(), TENURED); |
| 2828 | if (!maybe_reloc_info_array->ToObject(&reloc_info_array)) { |
| 2829 | return maybe_reloc_info_array; |
| 2830 | } |
| 2831 | } |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2832 | |
| 2833 | int new_body_size = RoundUp(code->instruction_size(), kObjectAlignment); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2834 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 2835 | int new_obj_size = Code::SizeFor(new_body_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2836 | |
| 2837 | Address old_addr = code->address(); |
| 2838 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2839 | size_t relocation_offset = |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2840 | static_cast<size_t>(code->instruction_end() - old_addr); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2841 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2842 | MaybeObject* maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2843 | if (new_obj_size > MaxObjectSizeInPagedSpace()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2844 | maybe_result = lo_space_->AllocateRawCode(new_obj_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2845 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2846 | maybe_result = code_space_->AllocateRaw(new_obj_size); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2847 | } |
| 2848 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2849 | Object* result; |
| 2850 | if (!maybe_result->ToObject(&result)) return maybe_result; |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2851 | |
| 2852 | // Copy code object. |
| 2853 | Address new_addr = reinterpret_cast<HeapObject*>(result)->address(); |
| 2854 | |
| 2855 | // Copy header and instructions. |
| 2856 | memcpy(new_addr, old_addr, relocation_offset); |
| 2857 | |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2858 | Code* new_code = Code::cast(result); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2859 | new_code->set_relocation_info(ByteArray::cast(reloc_info_array)); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2860 | |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 2861 | // Copy patched rinfo. |
| 2862 | memcpy(new_code->relocation_start(), reloc_info.start(), reloc_info.length()); |
fschneider@chromium.org | 086aac6 | 2010-03-17 13:18:24 +0000 | [diff] [blame] | 2863 | |
| 2864 | // Relocate the copy. |
| 2865 | ASSERT(!CodeRange::exists() || CodeRange::contains(code->address())); |
| 2866 | new_code->Relocate(new_addr - old_addr); |
| 2867 | |
| 2868 | #ifdef DEBUG |
| 2869 | code->Verify(); |
| 2870 | #endif |
| 2871 | return new_code; |
| 2872 | } |
| 2873 | |
| 2874 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2875 | MaybeObject* Heap::Allocate(Map* map, AllocationSpace space) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2876 | ASSERT(gc_state_ == NOT_IN_GC); |
| 2877 | ASSERT(map->instance_type() != MAP_TYPE); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2878 | // If allocation failures are disallowed, we may allocate in a different |
| 2879 | // space when new space is full and the object is not a large object. |
| 2880 | AllocationSpace retry_space = |
| 2881 | (space != NEW_SPACE) ? space : TargetSpaceId(map->instance_type()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2882 | Object* result; |
| 2883 | { MaybeObject* maybe_result = |
| 2884 | AllocateRaw(map->instance_size(), space, retry_space); |
| 2885 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2886 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2887 | HeapObject::cast(result)->set_map(map); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2888 | #ifdef ENABLE_LOGGING_AND_PROFILING |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 2889 | ProducerHeapProfile::RecordJSObjectAllocation(result); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 2890 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2891 | return result; |
| 2892 | } |
| 2893 | |
| 2894 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2895 | MaybeObject* Heap::InitializeFunction(JSFunction* function, |
| 2896 | SharedFunctionInfo* shared, |
| 2897 | Object* prototype) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2898 | ASSERT(!prototype->IsMap()); |
| 2899 | function->initialize_properties(); |
| 2900 | function->initialize_elements(); |
| 2901 | function->set_shared(shared); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 2902 | function->set_code(shared->code()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2903 | function->set_prototype_or_initial_map(prototype); |
| 2904 | function->set_context(undefined_value()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2905 | function->set_literals(empty_fixed_array()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2906 | function->set_next_function_link(undefined_value()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2907 | return function; |
| 2908 | } |
| 2909 | |
| 2910 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2911 | MaybeObject* Heap::AllocateFunctionPrototype(JSFunction* function) { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2912 | // Allocate the prototype. Make sure to use the object function |
| 2913 | // from the function's context, since the function can be from a |
| 2914 | // different context. |
| 2915 | JSFunction* object_function = |
| 2916 | function->context()->global_context()->object_function(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2917 | Object* prototype; |
| 2918 | { MaybeObject* maybe_prototype = AllocateJSObject(object_function); |
| 2919 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 2920 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2921 | // When creating the prototype for the function we must set its |
| 2922 | // constructor to the function. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2923 | Object* result; |
| 2924 | { MaybeObject* maybe_result = |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 2925 | JSObject::cast(prototype)->SetLocalPropertyIgnoreAttributes( |
| 2926 | constructor_symbol(), function, DONT_ENUM); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2927 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2928 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2929 | return prototype; |
| 2930 | } |
| 2931 | |
| 2932 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2933 | MaybeObject* Heap::AllocateFunction(Map* function_map, |
| 2934 | SharedFunctionInfo* shared, |
| 2935 | Object* prototype, |
| 2936 | PretenureFlag pretenure) { |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 2937 | AllocationSpace space = |
| 2938 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2939 | Object* result; |
| 2940 | { MaybeObject* maybe_result = Allocate(function_map, space); |
| 2941 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2942 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2943 | return InitializeFunction(JSFunction::cast(result), shared, prototype); |
| 2944 | } |
| 2945 | |
| 2946 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2947 | MaybeObject* Heap::AllocateArgumentsObject(Object* callee, int length) { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 2948 | // To get fast allocation and map sharing for arguments objects we |
| 2949 | // allocate them based on an arguments boilerplate. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2950 | |
| 2951 | // This calls Copy directly rather than using Heap::AllocateRaw so we |
| 2952 | // duplicate the check here. |
| 2953 | ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC); |
| 2954 | |
| 2955 | JSObject* boilerplate = |
| 2956 | Top::context()->global_context()->arguments_boilerplate(); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2957 | |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 2958 | // Check that the size of the boilerplate matches our |
| 2959 | // expectations. The ArgumentsAccessStub::GenerateNewObject relies |
| 2960 | // on the size being a known constant. |
| 2961 | ASSERT(kArgumentsObjectSize == boilerplate->map()->instance_size()); |
| 2962 | |
| 2963 | // Do the allocation. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2964 | Object* result; |
| 2965 | { MaybeObject* maybe_result = |
| 2966 | AllocateRaw(kArgumentsObjectSize, NEW_SPACE, OLD_POINTER_SPACE); |
| 2967 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 2968 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2969 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2970 | // Copy the content. The arguments boilerplate doesn't have any |
| 2971 | // fields that point to new space so it's safe to skip the write |
| 2972 | // barrier here. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2973 | CopyBlock(HeapObject::cast(result)->address(), |
| 2974 | boilerplate->address(), |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 2975 | kArgumentsObjectSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2976 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2977 | // Set the two properties. |
| 2978 | JSObject::cast(result)->InObjectPropertyAtPut(arguments_callee_index, |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2979 | callee); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 2980 | JSObject::cast(result)->InObjectPropertyAtPut(arguments_length_index, |
| 2981 | Smi::FromInt(length), |
| 2982 | SKIP_WRITE_BARRIER); |
| 2983 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2984 | // Check the state of the object |
| 2985 | ASSERT(JSObject::cast(result)->HasFastProperties()); |
| 2986 | ASSERT(JSObject::cast(result)->HasFastElements()); |
| 2987 | |
| 2988 | return result; |
| 2989 | } |
| 2990 | |
| 2991 | |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 2992 | static bool HasDuplicates(DescriptorArray* descriptors) { |
| 2993 | int count = descriptors->number_of_descriptors(); |
| 2994 | if (count > 1) { |
| 2995 | String* prev_key = descriptors->GetKey(0); |
| 2996 | for (int i = 1; i != count; i++) { |
| 2997 | String* current_key = descriptors->GetKey(i); |
| 2998 | if (prev_key == current_key) return true; |
| 2999 | prev_key = current_key; |
| 3000 | } |
| 3001 | } |
| 3002 | return false; |
| 3003 | } |
| 3004 | |
| 3005 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3006 | MaybeObject* Heap::AllocateInitialMap(JSFunction* fun) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3007 | ASSERT(!fun->has_initial_map()); |
| 3008 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3009 | // First create a new map with the size and number of in-object properties |
| 3010 | // suggested by the function. |
| 3011 | int instance_size = fun->shared()->CalculateInstanceSize(); |
| 3012 | int in_object_properties = fun->shared()->CalculateInObjectProperties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3013 | Object* map_obj; |
| 3014 | { MaybeObject* maybe_map_obj = |
| 3015 | Heap::AllocateMap(JS_OBJECT_TYPE, instance_size); |
| 3016 | if (!maybe_map_obj->ToObject(&map_obj)) return maybe_map_obj; |
| 3017 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3018 | |
| 3019 | // Fetch or allocate prototype. |
| 3020 | Object* prototype; |
| 3021 | if (fun->has_instance_prototype()) { |
| 3022 | prototype = fun->instance_prototype(); |
| 3023 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3024 | { MaybeObject* maybe_prototype = AllocateFunctionPrototype(fun); |
| 3025 | if (!maybe_prototype->ToObject(&prototype)) return maybe_prototype; |
| 3026 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3027 | } |
| 3028 | Map* map = Map::cast(map_obj); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3029 | map->set_inobject_properties(in_object_properties); |
| 3030 | map->set_unused_property_fields(in_object_properties); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3031 | map->set_prototype(prototype); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3032 | ASSERT(map->has_fast_elements()); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3033 | |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3034 | // If the function has only simple this property assignments add |
| 3035 | // field descriptors for these to the initial map as the object |
| 3036 | // cannot be constructed without having these properties. Guard by |
| 3037 | // the inline_new flag so we only change the map if we generate a |
| 3038 | // specialized construct stub. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3039 | ASSERT(in_object_properties <= Map::kMaxPreAllocatedPropertyFields); |
ager@chromium.org | 5c83825 | 2010-02-19 08:53:10 +0000 | [diff] [blame] | 3040 | if (fun->shared()->CanGenerateInlineConstructor(prototype)) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3041 | int count = fun->shared()->this_property_assignments_count(); |
| 3042 | if (count > in_object_properties) { |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3043 | // Inline constructor can only handle inobject properties. |
| 3044 | fun->shared()->ForbidInlineConstructor(); |
| 3045 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3046 | Object* descriptors_obj; |
| 3047 | { MaybeObject* maybe_descriptors_obj = DescriptorArray::Allocate(count); |
| 3048 | if (!maybe_descriptors_obj->ToObject(&descriptors_obj)) { |
| 3049 | return maybe_descriptors_obj; |
| 3050 | } |
| 3051 | } |
fschneider@chromium.org | c20610a | 2010-09-22 09:44:58 +0000 | [diff] [blame] | 3052 | DescriptorArray* descriptors = DescriptorArray::cast(descriptors_obj); |
| 3053 | for (int i = 0; i < count; i++) { |
| 3054 | String* name = fun->shared()->GetThisPropertyAssignmentName(i); |
| 3055 | ASSERT(name->IsSymbol()); |
| 3056 | FieldDescriptor field(name, i, NONE); |
| 3057 | field.SetEnumerationIndex(i); |
| 3058 | descriptors->Set(i, &field); |
| 3059 | } |
| 3060 | descriptors->SetNextEnumerationIndex(count); |
| 3061 | descriptors->SortUnchecked(); |
| 3062 | |
| 3063 | // The descriptors may contain duplicates because the compiler does not |
| 3064 | // guarantee the uniqueness of property names (it would have required |
| 3065 | // quadratic time). Once the descriptors are sorted we can check for |
| 3066 | // duplicates in linear time. |
| 3067 | if (HasDuplicates(descriptors)) { |
| 3068 | fun->shared()->ForbidInlineConstructor(); |
| 3069 | } else { |
| 3070 | map->set_instance_descriptors(descriptors); |
| 3071 | map->set_pre_allocated_property_fields(count); |
| 3072 | map->set_unused_property_fields(in_object_properties - count); |
| 3073 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3074 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3075 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3076 | |
| 3077 | fun->shared()->StartInobjectSlackTracking(map); |
| 3078 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3079 | return map; |
| 3080 | } |
| 3081 | |
| 3082 | |
| 3083 | void Heap::InitializeJSObjectFromMap(JSObject* obj, |
| 3084 | FixedArray* properties, |
| 3085 | Map* map) { |
| 3086 | obj->set_properties(properties); |
| 3087 | obj->initialize_elements(); |
| 3088 | // TODO(1240798): Initialize the object's body using valid initial values |
| 3089 | // according to the object's initial map. For example, if the map's |
| 3090 | // instance type is JS_ARRAY_TYPE, the length field should be initialized |
| 3091 | // to a number (eg, Smi::FromInt(0)) and the elements initialized to a |
| 3092 | // fixed array (eg, Heap::empty_fixed_array()). Currently, the object |
| 3093 | // verification code has to cope with (temporarily) invalid objects. See |
| 3094 | // for example, JSArray::JSArrayVerify). |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3095 | Object* filler; |
| 3096 | // We cannot always fill with one_pointer_filler_map because objects |
| 3097 | // created from API functions expect their internal fields to be initialized |
| 3098 | // with undefined_value. |
| 3099 | if (map->constructor()->IsJSFunction() && |
| 3100 | JSFunction::cast(map->constructor())->shared()-> |
| 3101 | IsInobjectSlackTrackingInProgress()) { |
| 3102 | // We might want to shrink the object later. |
| 3103 | ASSERT(obj->GetInternalFieldCount() == 0); |
| 3104 | filler = Heap::one_pointer_filler_map(); |
| 3105 | } else { |
| 3106 | filler = Heap::undefined_value(); |
| 3107 | } |
| 3108 | obj->InitializeBody(map->instance_size(), filler); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3109 | } |
| 3110 | |
| 3111 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3112 | MaybeObject* Heap::AllocateJSObjectFromMap(Map* map, PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3113 | // JSFunctions should be allocated using AllocateFunction to be |
| 3114 | // properly initialized. |
| 3115 | ASSERT(map->instance_type() != JS_FUNCTION_TYPE); |
| 3116 | |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3117 | // Both types of global objects should be allocated using |
| 3118 | // AllocateGlobalObject to be properly initialized. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3119 | ASSERT(map->instance_type() != JS_GLOBAL_OBJECT_TYPE); |
| 3120 | ASSERT(map->instance_type() != JS_BUILTINS_OBJECT_TYPE); |
| 3121 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3122 | // Allocate the backing storage for the properties. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3123 | int prop_size = |
| 3124 | map->pre_allocated_property_fields() + |
| 3125 | map->unused_property_fields() - |
| 3126 | map->inobject_properties(); |
| 3127 | ASSERT(prop_size >= 0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3128 | Object* properties; |
| 3129 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, pretenure); |
| 3130 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3131 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3132 | |
| 3133 | // Allocate the JSObject. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3134 | AllocationSpace space = |
| 3135 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3136 | if (map->instance_size() > MaxObjectSizeInPagedSpace()) space = LO_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3137 | Object* obj; |
| 3138 | { MaybeObject* maybe_obj = Allocate(map, space); |
| 3139 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3140 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3141 | |
| 3142 | // Initialize the JSObject. |
| 3143 | InitializeJSObjectFromMap(JSObject::cast(obj), |
| 3144 | FixedArray::cast(properties), |
| 3145 | map); |
fschneider@chromium.org | 40b9da3 | 2010-06-28 11:29:21 +0000 | [diff] [blame] | 3146 | ASSERT(JSObject::cast(obj)->HasFastElements()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3147 | return obj; |
| 3148 | } |
| 3149 | |
| 3150 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3151 | MaybeObject* Heap::AllocateJSObject(JSFunction* constructor, |
| 3152 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3153 | // Allocate the initial map if absent. |
| 3154 | if (!constructor->has_initial_map()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3155 | Object* initial_map; |
| 3156 | { MaybeObject* maybe_initial_map = AllocateInitialMap(constructor); |
| 3157 | if (!maybe_initial_map->ToObject(&initial_map)) return maybe_initial_map; |
| 3158 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3159 | constructor->set_initial_map(Map::cast(initial_map)); |
| 3160 | Map::cast(initial_map)->set_constructor(constructor); |
| 3161 | } |
| 3162 | // Allocate the object based on the constructors initial map. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3163 | MaybeObject* result = |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3164 | AllocateJSObjectFromMap(constructor->initial_map(), pretenure); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3165 | #ifdef DEBUG |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3166 | // Make sure result is NOT a global object if valid. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3167 | Object* non_failure; |
| 3168 | ASSERT(!result->ToObject(&non_failure) || !non_failure->IsGlobalObject()); |
| 3169 | #endif |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3170 | return result; |
| 3171 | } |
| 3172 | |
| 3173 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3174 | MaybeObject* Heap::AllocateGlobalObject(JSFunction* constructor) { |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3175 | ASSERT(constructor->has_initial_map()); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3176 | Map* map = constructor->initial_map(); |
| 3177 | |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3178 | // Make sure no field properties are described in the initial map. |
| 3179 | // This guarantees us that normalizing the properties does not |
| 3180 | // require us to change property values to JSGlobalPropertyCells. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3181 | ASSERT(map->NextFreePropertyIndex() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3182 | |
| 3183 | // Make sure we don't have a ton of pre-allocated slots in the |
| 3184 | // global objects. They will be unused once we normalize the object. |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3185 | ASSERT(map->unused_property_fields() == 0); |
| 3186 | ASSERT(map->inobject_properties() == 0); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3187 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3188 | // Initial size of the backing store to avoid resize of the storage during |
| 3189 | // bootstrapping. The size differs between the JS global object ad the |
| 3190 | // builtins object. |
| 3191 | 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] | 3192 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3193 | // Allocate a dictionary object for backing storage. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3194 | Object* obj; |
| 3195 | { MaybeObject* maybe_obj = |
| 3196 | StringDictionary::Allocate( |
| 3197 | map->NumberOfDescribedProperties() * 2 + initial_size); |
| 3198 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3199 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3200 | StringDictionary* dictionary = StringDictionary::cast(obj); |
| 3201 | |
| 3202 | // The global object might be created from an object template with accessors. |
| 3203 | // Fill these accessors into the dictionary. |
| 3204 | DescriptorArray* descs = map->instance_descriptors(); |
| 3205 | for (int i = 0; i < descs->number_of_descriptors(); i++) { |
| 3206 | PropertyDetails details = descs->GetDetails(i); |
| 3207 | ASSERT(details.type() == CALLBACKS); // Only accessors are expected. |
| 3208 | PropertyDetails d = |
| 3209 | PropertyDetails(details.attributes(), CALLBACKS, details.index()); |
| 3210 | Object* value = descs->GetCallbacksObject(i); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3211 | { MaybeObject* maybe_value = Heap::AllocateJSGlobalPropertyCell(value); |
| 3212 | if (!maybe_value->ToObject(&value)) return maybe_value; |
| 3213 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3214 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3215 | Object* result; |
| 3216 | { MaybeObject* maybe_result = dictionary->Add(descs->GetKey(i), value, d); |
| 3217 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3218 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3219 | dictionary = StringDictionary::cast(result); |
| 3220 | } |
| 3221 | |
| 3222 | // Allocate the global object and initialize it with the backing store. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3223 | { MaybeObject* maybe_obj = Allocate(map, OLD_POINTER_SPACE); |
| 3224 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3225 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3226 | JSObject* global = JSObject::cast(obj); |
| 3227 | InitializeJSObjectFromMap(global, dictionary, map); |
| 3228 | |
| 3229 | // Create a new map for the global object. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3230 | { MaybeObject* maybe_obj = map->CopyDropDescriptors(); |
| 3231 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3232 | } |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 3233 | Map* new_map = Map::cast(obj); |
| 3234 | |
| 3235 | // Setup the global object as a normalized object. |
| 3236 | global->set_map(new_map); |
| 3237 | global->map()->set_instance_descriptors(Heap::empty_descriptor_array()); |
| 3238 | global->set_properties(dictionary); |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 3239 | |
| 3240 | // Make sure result is a global object with properties in dictionary. |
| 3241 | ASSERT(global->IsGlobalObject()); |
| 3242 | ASSERT(!global->HasFastProperties()); |
| 3243 | return global; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3244 | } |
| 3245 | |
| 3246 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3247 | MaybeObject* Heap::CopyJSObject(JSObject* source) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3248 | // Never used to copy functions. If functions need to be copied we |
| 3249 | // have to be careful to clear the literals array. |
| 3250 | ASSERT(!source->IsJSFunction()); |
| 3251 | |
| 3252 | // Make the clone. |
| 3253 | Map* map = source->map(); |
| 3254 | int object_size = map->instance_size(); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3255 | Object* clone; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3256 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3257 | // If we're forced to always allocate, we use the general allocation |
| 3258 | // functions which may leave us with an object in old space. |
| 3259 | if (always_allocate()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3260 | { MaybeObject* maybe_clone = |
| 3261 | AllocateRaw(object_size, NEW_SPACE, OLD_POINTER_SPACE); |
| 3262 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3263 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3264 | Address clone_address = HeapObject::cast(clone)->address(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3265 | CopyBlock(clone_address, |
| 3266 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3267 | object_size); |
| 3268 | // Update write barrier for all fields that lie beyond the header. |
vegorov@chromium.org | f837290 | 2010-03-15 10:26:20 +0000 | [diff] [blame] | 3269 | RecordWrites(clone_address, |
| 3270 | JSObject::kHeaderSize, |
antonm@chromium.org | 8e5e338 | 2010-03-24 09:56:30 +0000 | [diff] [blame] | 3271 | (object_size - JSObject::kHeaderSize) / kPointerSize); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3272 | } else { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3273 | { MaybeObject* maybe_clone = new_space_.AllocateRaw(object_size); |
| 3274 | if (!maybe_clone->ToObject(&clone)) return maybe_clone; |
| 3275 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3276 | ASSERT(Heap::InNewSpace(clone)); |
| 3277 | // 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] | 3278 | // the contents without worrying about updating the write barrier. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3279 | CopyBlock(HeapObject::cast(clone)->address(), |
| 3280 | source->address(), |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3281 | object_size); |
| 3282 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3283 | |
| 3284 | FixedArray* elements = FixedArray::cast(source->elements()); |
| 3285 | FixedArray* properties = FixedArray::cast(source->properties()); |
| 3286 | // Update elements if necessary. |
ager@chromium.org | b26c50a | 2010-03-26 09:27:16 +0000 | [diff] [blame] | 3287 | if (elements->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3288 | Object* elem; |
| 3289 | { MaybeObject* maybe_elem = |
| 3290 | (elements->map() == fixed_cow_array_map()) ? |
| 3291 | elements : CopyFixedArray(elements); |
| 3292 | if (!maybe_elem->ToObject(&elem)) return maybe_elem; |
| 3293 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3294 | JSObject::cast(clone)->set_elements(FixedArray::cast(elem)); |
| 3295 | } |
| 3296 | // Update properties if necessary. |
| 3297 | if (properties->length() > 0) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3298 | Object* prop; |
| 3299 | { MaybeObject* maybe_prop = CopyFixedArray(properties); |
| 3300 | if (!maybe_prop->ToObject(&prop)) return maybe_prop; |
| 3301 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3302 | JSObject::cast(clone)->set_properties(FixedArray::cast(prop)); |
| 3303 | } |
| 3304 | // Return the new clone. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3305 | #ifdef ENABLE_LOGGING_AND_PROFILING |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 3306 | ProducerHeapProfile::RecordJSObjectAllocation(clone); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 3307 | #endif |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3308 | return clone; |
| 3309 | } |
| 3310 | |
| 3311 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3312 | MaybeObject* Heap::ReinitializeJSGlobalProxy(JSFunction* constructor, |
| 3313 | JSGlobalProxy* object) { |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3314 | ASSERT(constructor->has_initial_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3315 | Map* map = constructor->initial_map(); |
| 3316 | |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3317 | // Check that the already allocated object has the same size and type as |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3318 | // objects allocated using the constructor. |
| 3319 | ASSERT(map->instance_size() == object->map()->instance_size()); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3320 | ASSERT(map->instance_type() == object->map()->instance_type()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3321 | |
| 3322 | // Allocate the backing storage for the properties. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3323 | int prop_size = map->unused_property_fields() - map->inobject_properties(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3324 | Object* properties; |
| 3325 | { MaybeObject* maybe_properties = AllocateFixedArray(prop_size, TENURED); |
| 3326 | if (!maybe_properties->ToObject(&properties)) return maybe_properties; |
| 3327 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3328 | |
| 3329 | // Reset the map for the object. |
| 3330 | object->set_map(constructor->initial_map()); |
| 3331 | |
| 3332 | // Reinitialize the object from the constructor map. |
| 3333 | InitializeJSObjectFromMap(object, FixedArray::cast(properties), map); |
| 3334 | return object; |
| 3335 | } |
| 3336 | |
| 3337 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3338 | MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string, |
| 3339 | PretenureFlag pretenure) { |
| 3340 | Object* result; |
| 3341 | { MaybeObject* maybe_result = |
| 3342 | AllocateRawAsciiString(string.length(), pretenure); |
| 3343 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3344 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3345 | |
| 3346 | // Copy the characters into the new object. |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3347 | SeqAsciiString* string_result = SeqAsciiString::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3348 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3349 | string_result->SeqAsciiStringSet(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3350 | } |
| 3351 | return result; |
| 3352 | } |
| 3353 | |
| 3354 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3355 | MaybeObject* Heap::AllocateStringFromUtf8Slow(Vector<const char> string, |
| 3356 | PretenureFlag pretenure) { |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3357 | // V8 only supports characters in the Basic Multilingual Plane. |
| 3358 | const uc32 kMaxSupportedChar = 0xFFFF; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3359 | // Count the number of characters in the UTF-8 string and check if |
| 3360 | // it is an ASCII string. |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 3361 | Access<ScannerConstants::Utf8Decoder> |
| 3362 | decoder(ScannerConstants::utf8_decoder()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3363 | decoder->Reset(string.start(), string.length()); |
| 3364 | int chars = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3365 | while (decoder->has_more()) { |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3366 | decoder->GetNext(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3367 | chars++; |
| 3368 | } |
| 3369 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3370 | Object* result; |
| 3371 | { MaybeObject* maybe_result = AllocateRawTwoByteString(chars, pretenure); |
| 3372 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3373 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3374 | |
| 3375 | // Convert and copy the characters into the new object. |
| 3376 | String* string_result = String::cast(result); |
| 3377 | decoder->Reset(string.start(), string.length()); |
| 3378 | for (int i = 0; i < chars; i++) { |
| 3379 | uc32 r = decoder->GetNext(); |
erik.corry@gmail.com | 4a2e25e | 2010-07-07 12:22:46 +0000 | [diff] [blame] | 3380 | if (r > kMaxSupportedChar) { r = unibrow::Utf8::kBadChar; } |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3381 | string_result->Set(i, r); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3382 | } |
| 3383 | return result; |
| 3384 | } |
| 3385 | |
| 3386 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3387 | MaybeObject* Heap::AllocateStringFromTwoByte(Vector<const uc16> string, |
| 3388 | PretenureFlag pretenure) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3389 | // Check if the string is an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3390 | MaybeObject* maybe_result; |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 3391 | if (String::IsAscii(string.start(), string.length())) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3392 | maybe_result = AllocateRawAsciiString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3393 | } else { // It's not an ASCII string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3394 | maybe_result = AllocateRawTwoByteString(string.length(), pretenure); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3395 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3396 | Object* result; |
| 3397 | if (!maybe_result->ToObject(&result)) return maybe_result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3398 | |
| 3399 | // Copy the characters into the new object, which may be either ASCII or |
| 3400 | // UTF-16. |
| 3401 | String* string_result = String::cast(result); |
| 3402 | for (int i = 0; i < string.length(); i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3403 | string_result->Set(i, string[i]); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3404 | } |
| 3405 | return result; |
| 3406 | } |
| 3407 | |
| 3408 | |
| 3409 | Map* Heap::SymbolMapForString(String* string) { |
| 3410 | // If the string is in new space it cannot be used as a symbol. |
| 3411 | if (InNewSpace(string)) return NULL; |
| 3412 | |
| 3413 | // Find the corresponding symbol map for strings. |
| 3414 | Map* map = string->map(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3415 | if (map == ascii_string_map()) return ascii_symbol_map(); |
| 3416 | if (map == string_map()) return symbol_map(); |
| 3417 | if (map == cons_string_map()) return cons_symbol_map(); |
| 3418 | if (map == cons_ascii_string_map()) return cons_ascii_symbol_map(); |
| 3419 | if (map == external_string_map()) return external_symbol_map(); |
| 3420 | if (map == external_ascii_string_map()) return external_ascii_symbol_map(); |
ricow@chromium.org | 5ad5ace | 2010-06-23 09:06:43 +0000 | [diff] [blame] | 3421 | if (map == external_string_with_ascii_data_map()) { |
| 3422 | return external_symbol_with_ascii_data_map(); |
| 3423 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3424 | |
| 3425 | // No match found. |
| 3426 | return NULL; |
| 3427 | } |
| 3428 | |
| 3429 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3430 | MaybeObject* Heap::AllocateInternalSymbol(unibrow::CharacterStream* buffer, |
| 3431 | int chars, |
| 3432 | uint32_t hash_field) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3433 | ASSERT(chars >= 0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3434 | // Ensure the chars matches the number of characters in the buffer. |
| 3435 | ASSERT(static_cast<unsigned>(chars) == buffer->Length()); |
| 3436 | // Determine whether the string is ascii. |
| 3437 | bool is_ascii = true; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3438 | while (buffer->has_more()) { |
| 3439 | if (buffer->GetNext() > unibrow::Utf8::kMaxOneByteChar) { |
| 3440 | is_ascii = false; |
| 3441 | break; |
| 3442 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3443 | } |
| 3444 | buffer->Rewind(); |
| 3445 | |
| 3446 | // Compute map and object size. |
| 3447 | int size; |
| 3448 | Map* map; |
| 3449 | |
| 3450 | if (is_ascii) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3451 | if (chars > SeqAsciiString::kMaxLength) { |
| 3452 | return Failure::OutOfMemoryException(); |
| 3453 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3454 | map = ascii_symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3455 | size = SeqAsciiString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3456 | } else { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3457 | if (chars > SeqTwoByteString::kMaxLength) { |
| 3458 | return Failure::OutOfMemoryException(); |
| 3459 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3460 | map = symbol_map(); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3461 | size = SeqTwoByteString::SizeFor(chars); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3462 | } |
| 3463 | |
| 3464 | // Allocate string. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3465 | Object* result; |
| 3466 | { MaybeObject* maybe_result = (size > MaxObjectSizeInPagedSpace()) |
| 3467 | ? lo_space_->AllocateRaw(size) |
| 3468 | : old_data_space_->AllocateRaw(size); |
| 3469 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3470 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3471 | |
| 3472 | reinterpret_cast<HeapObject*>(result)->set_map(map); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3473 | // Set length and hash fields of the allocated string. |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3474 | String* answer = String::cast(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3475 | answer->set_length(chars); |
| 3476 | answer->set_hash_field(hash_field); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3477 | |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3478 | ASSERT_EQ(size, answer->Size()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3479 | |
| 3480 | // Fill in the characters. |
| 3481 | for (int i = 0; i < chars; i++) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 3482 | answer->Set(i, buffer->GetNext()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3483 | } |
ager@chromium.org | 870a0b6 | 2008-11-04 11:43:05 +0000 | [diff] [blame] | 3484 | return answer; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3485 | } |
| 3486 | |
| 3487 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3488 | MaybeObject* Heap::AllocateRawAsciiString(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3489 | if (length < 0 || length > SeqAsciiString::kMaxLength) { |
| 3490 | return Failure::OutOfMemoryException(); |
| 3491 | } |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3492 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 3493 | int size = SeqAsciiString::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3494 | ASSERT(size <= SeqAsciiString::kMaxSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3495 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3496 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3497 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 3498 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3499 | if (space == NEW_SPACE) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3500 | if (size > kMaxObjectSizeInNewSpace) { |
| 3501 | // Allocate in large object space, retry space will be ignored. |
| 3502 | space = LO_SPACE; |
| 3503 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 3504 | // Allocate in new space, retry in large object space. |
| 3505 | retry_space = LO_SPACE; |
| 3506 | } |
| 3507 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 3508 | space = LO_SPACE; |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3509 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3510 | Object* result; |
| 3511 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 3512 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3513 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3514 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3515 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3516 | HeapObject::cast(result)->set_map(ascii_string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3517 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3518 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3519 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 3520 | return result; |
| 3521 | } |
| 3522 | |
| 3523 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3524 | MaybeObject* Heap::AllocateRawTwoByteString(int length, |
| 3525 | PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3526 | if (length < 0 || length > SeqTwoByteString::kMaxLength) { |
| 3527 | return Failure::OutOfMemoryException(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3528 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3529 | int size = SeqTwoByteString::SizeFor(length); |
| 3530 | ASSERT(size <= SeqTwoByteString::kMaxSize); |
| 3531 | AllocationSpace space = (pretenure == TENURED) ? OLD_DATA_SPACE : NEW_SPACE; |
| 3532 | AllocationSpace retry_space = OLD_DATA_SPACE; |
| 3533 | |
| 3534 | if (space == NEW_SPACE) { |
| 3535 | if (size > kMaxObjectSizeInNewSpace) { |
| 3536 | // Allocate in large object space, retry space will be ignored. |
| 3537 | space = LO_SPACE; |
| 3538 | } else if (size > MaxObjectSizeInPagedSpace()) { |
| 3539 | // Allocate in new space, retry in large object space. |
| 3540 | retry_space = LO_SPACE; |
| 3541 | } |
| 3542 | } else if (space == OLD_DATA_SPACE && size > MaxObjectSizeInPagedSpace()) { |
| 3543 | space = LO_SPACE; |
| 3544 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3545 | Object* result; |
| 3546 | { MaybeObject* maybe_result = AllocateRaw(size, space, retry_space); |
| 3547 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3548 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3549 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3550 | // Partially initialize the object. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3551 | HeapObject::cast(result)->set_map(string_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3552 | String::cast(result)->set_length(length); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3553 | String::cast(result)->set_hash_field(String::kEmptyHashField); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3554 | ASSERT_EQ(size, HeapObject::cast(result)->Size()); |
| 3555 | return result; |
| 3556 | } |
| 3557 | |
| 3558 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3559 | MaybeObject* Heap::AllocateEmptyFixedArray() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3560 | int size = FixedArray::SizeFor(0); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3561 | Object* result; |
| 3562 | { MaybeObject* maybe_result = |
| 3563 | AllocateRaw(size, OLD_DATA_SPACE, OLD_DATA_SPACE); |
| 3564 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3565 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3566 | // Initialize the object. |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3567 | reinterpret_cast<FixedArray*>(result)->set_map(fixed_array_map()); |
| 3568 | reinterpret_cast<FixedArray*>(result)->set_length(0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3569 | return result; |
| 3570 | } |
| 3571 | |
| 3572 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3573 | MaybeObject* Heap::AllocateRawFixedArray(int length) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3574 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 3575 | return Failure::OutOfMemoryException(); |
| 3576 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3577 | ASSERT(length > 0); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 3578 | // Use the general function if we're forced to always allocate. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 3579 | if (always_allocate()) return AllocateFixedArray(length, TENURED); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3580 | // Allocate the raw data for a fixed array. |
| 3581 | int size = FixedArray::SizeFor(length); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3582 | return size <= kMaxObjectSizeInNewSpace |
| 3583 | ? new_space_.AllocateRaw(size) |
| 3584 | : lo_space_->AllocateRawFixedArray(size); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3585 | } |
| 3586 | |
| 3587 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3588 | MaybeObject* Heap::CopyFixedArrayWithMap(FixedArray* src, Map* map) { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3589 | int len = src->length(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3590 | Object* obj; |
| 3591 | { MaybeObject* maybe_obj = AllocateRawFixedArray(len); |
| 3592 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3593 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3594 | if (Heap::InNewSpace(obj)) { |
| 3595 | HeapObject* dst = HeapObject::cast(obj); |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3596 | dst->set_map(map); |
| 3597 | CopyBlock(dst->address() + kPointerSize, |
| 3598 | src->address() + kPointerSize, |
| 3599 | FixedArray::SizeFor(len) - kPointerSize); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3600 | return obj; |
| 3601 | } |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 3602 | HeapObject::cast(obj)->set_map(map); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3603 | FixedArray* result = FixedArray::cast(obj); |
| 3604 | result->set_length(len); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3605 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3606 | // Copy the content |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3607 | AssertNoAllocation no_gc; |
| 3608 | WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3609 | for (int i = 0; i < len; i++) result->set(i, src->get(i), mode); |
| 3610 | return result; |
| 3611 | } |
| 3612 | |
| 3613 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3614 | MaybeObject* Heap::AllocateFixedArray(int length) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 3615 | ASSERT(length >= 0); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 3616 | if (length == 0) return empty_fixed_array(); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3617 | Object* result; |
| 3618 | { MaybeObject* maybe_result = AllocateRawFixedArray(length); |
| 3619 | if (!maybe_result->ToObject(&result)) return maybe_result; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3620 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3621 | // Initialize header. |
| 3622 | FixedArray* array = reinterpret_cast<FixedArray*>(result); |
| 3623 | array->set_map(fixed_array_map()); |
| 3624 | array->set_length(length); |
| 3625 | // Initialize body. |
| 3626 | ASSERT(!Heap::InNewSpace(undefined_value())); |
| 3627 | MemsetPointer(array->data_start(), undefined_value(), length); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3628 | return result; |
| 3629 | } |
| 3630 | |
| 3631 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3632 | MaybeObject* Heap::AllocateRawFixedArray(int length, PretenureFlag pretenure) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3633 | if (length < 0 || length > FixedArray::kMaxLength) { |
| 3634 | return Failure::OutOfMemoryException(); |
| 3635 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3636 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3637 | AllocationSpace space = |
| 3638 | (pretenure == TENURED) ? OLD_POINTER_SPACE : NEW_SPACE; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3639 | int size = FixedArray::SizeFor(length); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3640 | if (space == NEW_SPACE && size > kMaxObjectSizeInNewSpace) { |
| 3641 | // Too big for new space. |
| 3642 | space = LO_SPACE; |
| 3643 | } else if (space == OLD_POINTER_SPACE && |
| 3644 | size > MaxObjectSizeInPagedSpace()) { |
| 3645 | // Too big for old pointer space. |
| 3646 | space = LO_SPACE; |
| 3647 | } |
| 3648 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3649 | AllocationSpace retry_space = |
| 3650 | (size <= MaxObjectSizeInPagedSpace()) ? OLD_POINTER_SPACE : LO_SPACE; |
| 3651 | |
| 3652 | return AllocateRaw(size, space, retry_space); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3653 | } |
| 3654 | |
| 3655 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3656 | MUST_USE_RESULT static MaybeObject* AllocateFixedArrayWithFiller( |
| 3657 | int length, |
| 3658 | PretenureFlag pretenure, |
| 3659 | Object* filler) { |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3660 | ASSERT(length >= 0); |
| 3661 | ASSERT(Heap::empty_fixed_array()->IsFixedArray()); |
| 3662 | if (length == 0) return Heap::empty_fixed_array(); |
| 3663 | |
| 3664 | ASSERT(!Heap::InNewSpace(filler)); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3665 | Object* result; |
| 3666 | { MaybeObject* maybe_result = Heap::AllocateRawFixedArray(length, pretenure); |
| 3667 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3668 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 3669 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3670 | HeapObject::cast(result)->set_map(Heap::fixed_array_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3671 | FixedArray* array = FixedArray::cast(result); |
| 3672 | array->set_length(length); |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3673 | MemsetPointer(array->data_start(), filler, length); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3674 | return array; |
| 3675 | } |
| 3676 | |
| 3677 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3678 | MaybeObject* Heap::AllocateFixedArray(int length, PretenureFlag pretenure) { |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3679 | return AllocateFixedArrayWithFiller(length, pretenure, undefined_value()); |
| 3680 | } |
| 3681 | |
| 3682 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3683 | MaybeObject* Heap::AllocateFixedArrayWithHoles(int length, |
| 3684 | PretenureFlag pretenure) { |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 3685 | return AllocateFixedArrayWithFiller(length, pretenure, the_hole_value()); |
| 3686 | } |
| 3687 | |
| 3688 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3689 | MaybeObject* Heap::AllocateUninitializedFixedArray(int length) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3690 | if (length == 0) return empty_fixed_array(); |
| 3691 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3692 | Object* obj; |
| 3693 | { MaybeObject* maybe_obj = AllocateRawFixedArray(length); |
| 3694 | if (!maybe_obj->ToObject(&obj)) return maybe_obj; |
| 3695 | } |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3696 | |
| 3697 | reinterpret_cast<FixedArray*>(obj)->set_map(fixed_array_map()); |
| 3698 | FixedArray::cast(obj)->set_length(length); |
| 3699 | return obj; |
| 3700 | } |
| 3701 | |
| 3702 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3703 | MaybeObject* Heap::AllocateHashTable(int length, PretenureFlag pretenure) { |
| 3704 | Object* result; |
| 3705 | { MaybeObject* maybe_result = Heap::AllocateFixedArray(length, pretenure); |
| 3706 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3707 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3708 | reinterpret_cast<HeapObject*>(result)->set_map(hash_table_map()); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 3709 | ASSERT(result->IsHashTable()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3710 | return result; |
| 3711 | } |
| 3712 | |
| 3713 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3714 | MaybeObject* Heap::AllocateGlobalContext() { |
| 3715 | Object* result; |
| 3716 | { MaybeObject* maybe_result = |
| 3717 | Heap::AllocateFixedArray(Context::GLOBAL_CONTEXT_SLOTS); |
| 3718 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3719 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3720 | Context* context = reinterpret_cast<Context*>(result); |
| 3721 | context->set_map(global_context_map()); |
| 3722 | ASSERT(context->IsGlobalContext()); |
| 3723 | ASSERT(result->IsContext()); |
| 3724 | return result; |
| 3725 | } |
| 3726 | |
| 3727 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3728 | MaybeObject* Heap::AllocateFunctionContext(int length, JSFunction* function) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3729 | ASSERT(length >= Context::MIN_CONTEXT_SLOTS); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3730 | Object* result; |
| 3731 | { MaybeObject* maybe_result = Heap::AllocateFixedArray(length); |
| 3732 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3733 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3734 | Context* context = reinterpret_cast<Context*>(result); |
| 3735 | context->set_map(context_map()); |
| 3736 | context->set_closure(function); |
| 3737 | context->set_fcontext(context); |
| 3738 | context->set_previous(NULL); |
| 3739 | context->set_extension(NULL); |
| 3740 | context->set_global(function->context()->global()); |
| 3741 | ASSERT(!context->IsGlobalContext()); |
| 3742 | ASSERT(context->is_function_context()); |
| 3743 | ASSERT(result->IsContext()); |
| 3744 | return result; |
| 3745 | } |
| 3746 | |
| 3747 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3748 | MaybeObject* Heap::AllocateWithContext(Context* previous, |
| 3749 | JSObject* extension, |
| 3750 | bool is_catch_context) { |
| 3751 | Object* result; |
| 3752 | { MaybeObject* maybe_result = |
| 3753 | Heap::AllocateFixedArray(Context::MIN_CONTEXT_SLOTS); |
| 3754 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3755 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3756 | Context* context = reinterpret_cast<Context*>(result); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 3757 | context->set_map(is_catch_context ? catch_context_map() : context_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3758 | context->set_closure(previous->closure()); |
| 3759 | context->set_fcontext(previous->fcontext()); |
| 3760 | context->set_previous(previous); |
| 3761 | context->set_extension(extension); |
| 3762 | context->set_global(previous->global()); |
| 3763 | ASSERT(!context->IsGlobalContext()); |
| 3764 | ASSERT(!context->is_function_context()); |
| 3765 | ASSERT(result->IsContext()); |
| 3766 | return result; |
| 3767 | } |
| 3768 | |
| 3769 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3770 | MaybeObject* Heap::AllocateStruct(InstanceType type) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3771 | Map* map; |
| 3772 | switch (type) { |
| 3773 | #define MAKE_CASE(NAME, Name, name) case NAME##_TYPE: map = name##_map(); break; |
| 3774 | STRUCT_LIST(MAKE_CASE) |
| 3775 | #undef MAKE_CASE |
| 3776 | default: |
| 3777 | UNREACHABLE(); |
| 3778 | return Failure::InternalError(); |
| 3779 | } |
| 3780 | int size = map->instance_size(); |
| 3781 | AllocationSpace space = |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 3782 | (size > MaxObjectSizeInPagedSpace()) ? LO_SPACE : OLD_POINTER_SPACE; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 3783 | Object* result; |
| 3784 | { MaybeObject* maybe_result = Heap::Allocate(map, space); |
| 3785 | if (!maybe_result->ToObject(&result)) return maybe_result; |
| 3786 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3787 | Struct::cast(result)->InitializeBody(size); |
| 3788 | return result; |
| 3789 | } |
| 3790 | |
| 3791 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3792 | bool Heap::IdleNotification() { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3793 | static const int kIdlesBeforeScavenge = 4; |
| 3794 | static const int kIdlesBeforeMarkSweep = 7; |
| 3795 | static const int kIdlesBeforeMarkCompact = 8; |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 3796 | static const int kMaxIdleCount = kIdlesBeforeMarkCompact + 1; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 3797 | static const unsigned int kGCsBetweenCleanup = 4; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3798 | static int number_idle_notifications = 0; |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 3799 | static unsigned int last_gc_count = gc_count_; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3800 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3801 | bool uncommit = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3802 | bool finished = false; |
| 3803 | |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 3804 | // Reset the number of idle notifications received when a number of |
| 3805 | // GCs have taken place. This allows another round of cleanup based |
| 3806 | // on idle notifications if enough work has been carried out to |
| 3807 | // provoke a number of garbage collections. |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 3808 | if (gc_count_ - last_gc_count < kGCsBetweenCleanup) { |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 3809 | number_idle_notifications = |
| 3810 | Min(number_idle_notifications + 1, kMaxIdleCount); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3811 | } else { |
| 3812 | number_idle_notifications = 0; |
| 3813 | last_gc_count = gc_count_; |
| 3814 | } |
| 3815 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3816 | if (number_idle_notifications == kIdlesBeforeScavenge) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3817 | if (contexts_disposed_ > 0) { |
| 3818 | HistogramTimerScope scope(&Counters::gc_context); |
| 3819 | CollectAllGarbage(false); |
| 3820 | } else { |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 3821 | CollectGarbage(NEW_SPACE); |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3822 | } |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3823 | new_space_.Shrink(); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3824 | last_gc_count = gc_count_; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3825 | } else if (number_idle_notifications == kIdlesBeforeMarkSweep) { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 3826 | // Before doing the mark-sweep collections we clear the |
| 3827 | // compilation cache to avoid hanging on to source code and |
| 3828 | // generated code for cached functions. |
| 3829 | CompilationCache::Clear(); |
| 3830 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3831 | CollectAllGarbage(false); |
| 3832 | new_space_.Shrink(); |
| 3833 | last_gc_count = gc_count_; |
| 3834 | |
| 3835 | } else if (number_idle_notifications == kIdlesBeforeMarkCompact) { |
| 3836 | CollectAllGarbage(true); |
| 3837 | new_space_.Shrink(); |
| 3838 | last_gc_count = gc_count_; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 3839 | finished = true; |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3840 | |
| 3841 | } else if (contexts_disposed_ > 0) { |
| 3842 | if (FLAG_expose_gc) { |
| 3843 | contexts_disposed_ = 0; |
| 3844 | } else { |
| 3845 | HistogramTimerScope scope(&Counters::gc_context); |
| 3846 | CollectAllGarbage(false); |
| 3847 | last_gc_count = gc_count_; |
| 3848 | } |
| 3849 | // If this is the first idle notification, we reset the |
| 3850 | // notification count to avoid letting idle notifications for |
| 3851 | // context disposal garbage collections start a potentially too |
| 3852 | // aggressive idle GC cycle. |
| 3853 | if (number_idle_notifications <= 1) { |
| 3854 | number_idle_notifications = 0; |
| 3855 | uncommit = false; |
| 3856 | } |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 3857 | } else if (number_idle_notifications > kIdlesBeforeMarkCompact) { |
| 3858 | // If we have received more than kIdlesBeforeMarkCompact idle |
| 3859 | // notifications we do not perform any cleanup because we don't |
| 3860 | // expect to gain much by doing so. |
| 3861 | finished = true; |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3862 | } |
| 3863 | |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 3864 | // Make sure that we have no pending context disposals and |
| 3865 | // conditionally uncommit from space. |
| 3866 | ASSERT(contexts_disposed_ == 0); |
| 3867 | if (uncommit) Heap::UncommitFromSpace(); |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 3868 | return finished; |
| 3869 | } |
| 3870 | |
| 3871 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3872 | #ifdef DEBUG |
| 3873 | |
| 3874 | void Heap::Print() { |
| 3875 | if (!HasBeenSetup()) return; |
| 3876 | Top::PrintStack(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3877 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3878 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 3879 | space->Print(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3880 | } |
| 3881 | |
| 3882 | |
| 3883 | void Heap::ReportCodeStatistics(const char* title) { |
| 3884 | PrintF(">>>>>> Code Stats (%s) >>>>>>\n", title); |
| 3885 | PagedSpace::ResetCodeStatistics(); |
| 3886 | // We do not look for code in new space, map space, or old space. If code |
| 3887 | // somehow ends up in those spaces, we would miss it here. |
| 3888 | code_space_->CollectCodeStatistics(); |
| 3889 | lo_space_->CollectCodeStatistics(); |
| 3890 | PagedSpace::ReportCodeStatistics(); |
| 3891 | } |
| 3892 | |
| 3893 | |
| 3894 | // This function expects that NewSpace's allocated objects histogram is |
| 3895 | // populated (via a call to CollectStatistics or else as a side effect of a |
| 3896 | // just-completed scavenge collection). |
| 3897 | void Heap::ReportHeapStatistics(const char* title) { |
| 3898 | USE(title); |
| 3899 | PrintF(">>>>>> =============== %s (%d) =============== >>>>>>\n", |
| 3900 | title, gc_count_); |
| 3901 | PrintF("mark-compact GC : %d\n", mc_count_); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 3902 | PrintF("old_gen_promotion_limit_ %" V8_PTR_PREFIX "d\n", |
| 3903 | old_gen_promotion_limit_); |
| 3904 | PrintF("old_gen_allocation_limit_ %" V8_PTR_PREFIX "d\n", |
| 3905 | old_gen_allocation_limit_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3906 | |
| 3907 | PrintF("\n"); |
| 3908 | PrintF("Number of handles : %d\n", HandleScope::NumberOfHandles()); |
| 3909 | GlobalHandles::PrintStats(); |
| 3910 | PrintF("\n"); |
| 3911 | |
| 3912 | PrintF("Heap statistics : "); |
| 3913 | MemoryAllocator::ReportStatistics(); |
| 3914 | PrintF("To space : "); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3915 | new_space_.ReportStatistics(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3916 | PrintF("Old pointer space : "); |
| 3917 | old_pointer_space_->ReportStatistics(); |
| 3918 | PrintF("Old data space : "); |
| 3919 | old_data_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3920 | PrintF("Code space : "); |
| 3921 | code_space_->ReportStatistics(); |
| 3922 | PrintF("Map space : "); |
| 3923 | map_space_->ReportStatistics(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3924 | PrintF("Cell space : "); |
| 3925 | cell_space_->ReportStatistics(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3926 | PrintF("Large object space : "); |
| 3927 | lo_space_->ReportStatistics(); |
| 3928 | PrintF(">>>>>> ========================================= >>>>>>\n"); |
| 3929 | } |
| 3930 | |
| 3931 | #endif // DEBUG |
| 3932 | |
| 3933 | bool Heap::Contains(HeapObject* value) { |
| 3934 | return Contains(value->address()); |
| 3935 | } |
| 3936 | |
| 3937 | |
| 3938 | bool Heap::Contains(Address addr) { |
| 3939 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 3940 | return HasBeenSetup() && |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3941 | (new_space_.ToSpaceContains(addr) || |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3942 | old_pointer_space_->Contains(addr) || |
| 3943 | old_data_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3944 | code_space_->Contains(addr) || |
| 3945 | map_space_->Contains(addr) || |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3946 | cell_space_->Contains(addr) || |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3947 | lo_space_->SlowContains(addr)); |
| 3948 | } |
| 3949 | |
| 3950 | |
| 3951 | bool Heap::InSpace(HeapObject* value, AllocationSpace space) { |
| 3952 | return InSpace(value->address(), space); |
| 3953 | } |
| 3954 | |
| 3955 | |
| 3956 | bool Heap::InSpace(Address addr, AllocationSpace space) { |
| 3957 | if (OS::IsOutsideAllocatedSpace(addr)) return false; |
| 3958 | if (!HasBeenSetup()) return false; |
| 3959 | |
| 3960 | switch (space) { |
| 3961 | case NEW_SPACE: |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 3962 | return new_space_.ToSpaceContains(addr); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3963 | case OLD_POINTER_SPACE: |
| 3964 | return old_pointer_space_->Contains(addr); |
| 3965 | case OLD_DATA_SPACE: |
| 3966 | return old_data_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3967 | case CODE_SPACE: |
| 3968 | return code_space_->Contains(addr); |
| 3969 | case MAP_SPACE: |
| 3970 | return map_space_->Contains(addr); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3971 | case CELL_SPACE: |
| 3972 | return cell_space_->Contains(addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3973 | case LO_SPACE: |
| 3974 | return lo_space_->SlowContains(addr); |
| 3975 | } |
| 3976 | |
| 3977 | return false; |
| 3978 | } |
| 3979 | |
| 3980 | |
| 3981 | #ifdef DEBUG |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3982 | static void DummyScavengePointer(HeapObject** p) { |
| 3983 | } |
| 3984 | |
| 3985 | |
| 3986 | static void VerifyPointersUnderWatermark( |
| 3987 | PagedSpace* space, |
| 3988 | DirtyRegionCallback visit_dirty_region) { |
| 3989 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 3990 | |
| 3991 | while (it.has_next()) { |
| 3992 | Page* page = it.next(); |
| 3993 | Address start = page->ObjectAreaStart(); |
| 3994 | Address end = page->AllocationWatermark(); |
| 3995 | |
| 3996 | Heap::IterateDirtyRegions(Page::kAllRegionsDirtyMarks, |
| 3997 | start, |
| 3998 | end, |
| 3999 | visit_dirty_region, |
| 4000 | &DummyScavengePointer); |
| 4001 | } |
| 4002 | } |
| 4003 | |
| 4004 | |
| 4005 | static void VerifyPointersUnderWatermark(LargeObjectSpace* space) { |
| 4006 | LargeObjectIterator it(space); |
| 4007 | for (HeapObject* object = it.next(); object != NULL; object = it.next()) { |
| 4008 | if (object->IsFixedArray()) { |
| 4009 | Address slot_address = object->address(); |
| 4010 | Address end = object->address() + object->Size(); |
| 4011 | |
| 4012 | while (slot_address < end) { |
| 4013 | HeapObject** slot = reinterpret_cast<HeapObject**>(slot_address); |
| 4014 | // When we are not in GC the Heap::InNewSpace() predicate |
| 4015 | // checks that pointers which satisfy predicate point into |
| 4016 | // the active semispace. |
| 4017 | Heap::InNewSpace(*slot); |
| 4018 | slot_address += kPointerSize; |
| 4019 | } |
| 4020 | } |
| 4021 | } |
| 4022 | } |
| 4023 | |
| 4024 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4025 | void Heap::Verify() { |
| 4026 | ASSERT(HasBeenSetup()); |
| 4027 | |
| 4028 | VerifyPointersVisitor visitor; |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4029 | IterateRoots(&visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4030 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4031 | new_space_.Verify(); |
| 4032 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4033 | VerifyPointersAndDirtyRegionsVisitor dirty_regions_visitor; |
| 4034 | old_pointer_space_->Verify(&dirty_regions_visitor); |
| 4035 | map_space_->Verify(&dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4036 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4037 | VerifyPointersUnderWatermark(old_pointer_space_, |
| 4038 | &IteratePointersInDirtyRegion); |
| 4039 | VerifyPointersUnderWatermark(map_space_, |
| 4040 | &IteratePointersInDirtyMapsRegion); |
| 4041 | VerifyPointersUnderWatermark(lo_space_); |
| 4042 | |
| 4043 | VerifyPageWatermarkValidity(old_pointer_space_, ALL_INVALID); |
| 4044 | VerifyPageWatermarkValidity(map_space_, ALL_INVALID); |
| 4045 | |
| 4046 | VerifyPointersVisitor no_dirty_regions_visitor; |
| 4047 | old_data_space_->Verify(&no_dirty_regions_visitor); |
| 4048 | code_space_->Verify(&no_dirty_regions_visitor); |
| 4049 | cell_space_->Verify(&no_dirty_regions_visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4050 | |
| 4051 | lo_space_->Verify(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4052 | } |
| 4053 | #endif // DEBUG |
| 4054 | |
| 4055 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4056 | MaybeObject* Heap::LookupSymbol(Vector<const char> string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4057 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4058 | Object* new_table; |
| 4059 | { MaybeObject* maybe_new_table = |
| 4060 | symbol_table()->LookupSymbol(string, &symbol); |
| 4061 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4062 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4063 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4064 | // SymbolTable is a singleton and checks for identity. |
| 4065 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4066 | ASSERT(symbol != NULL); |
| 4067 | return symbol; |
| 4068 | } |
| 4069 | |
| 4070 | |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 4071 | MaybeObject* Heap::LookupAsciiSymbol(Vector<const char> string) { |
| 4072 | Object* symbol = NULL; |
| 4073 | Object* new_table; |
| 4074 | { MaybeObject* maybe_new_table = |
| 4075 | symbol_table()->LookupAsciiSymbol(string, &symbol); |
| 4076 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4077 | } |
| 4078 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4079 | // SymbolTable is a singleton and checks for identity. |
| 4080 | roots_[kSymbolTableRootIndex] = new_table; |
| 4081 | ASSERT(symbol != NULL); |
| 4082 | return symbol; |
| 4083 | } |
| 4084 | |
| 4085 | |
| 4086 | MaybeObject* Heap::LookupTwoByteSymbol(Vector<const uc16> string) { |
| 4087 | Object* symbol = NULL; |
| 4088 | Object* new_table; |
| 4089 | { MaybeObject* maybe_new_table = |
| 4090 | symbol_table()->LookupTwoByteSymbol(string, &symbol); |
| 4091 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4092 | } |
| 4093 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4094 | // SymbolTable is a singleton and checks for identity. |
| 4095 | roots_[kSymbolTableRootIndex] = new_table; |
| 4096 | ASSERT(symbol != NULL); |
| 4097 | return symbol; |
| 4098 | } |
| 4099 | |
| 4100 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4101 | MaybeObject* Heap::LookupSymbol(String* string) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4102 | if (string->IsSymbol()) return string; |
| 4103 | Object* symbol = NULL; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 4104 | Object* new_table; |
| 4105 | { MaybeObject* maybe_new_table = |
| 4106 | symbol_table()->LookupString(string, &symbol); |
| 4107 | if (!maybe_new_table->ToObject(&new_table)) return maybe_new_table; |
| 4108 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4109 | // Can't use set_symbol_table because SymbolTable::cast knows that |
| 4110 | // SymbolTable is a singleton and checks for identity. |
| 4111 | roots_[kSymbolTableRootIndex] = new_table; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4112 | ASSERT(symbol != NULL); |
| 4113 | return symbol; |
| 4114 | } |
| 4115 | |
| 4116 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4117 | bool Heap::LookupSymbolIfExists(String* string, String** symbol) { |
| 4118 | if (string->IsSymbol()) { |
| 4119 | *symbol = string; |
| 4120 | return true; |
| 4121 | } |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4122 | return symbol_table()->LookupSymbolIfExists(string, symbol); |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 4123 | } |
| 4124 | |
| 4125 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4126 | #ifdef DEBUG |
| 4127 | void Heap::ZapFromSpace() { |
erik.corry@gmail.com | d91075f | 2011-02-10 07:45:38 +0000 | [diff] [blame] | 4128 | ASSERT(reinterpret_cast<Object*>(kFromSpaceZapValue)->IsFailure()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4129 | for (Address a = new_space_.FromSpaceLow(); |
| 4130 | a < new_space_.FromSpaceHigh(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4131 | a += kPointerSize) { |
| 4132 | Memory::Address_at(a) = kFromSpaceZapValue; |
| 4133 | } |
| 4134 | } |
| 4135 | #endif // DEBUG |
| 4136 | |
| 4137 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4138 | bool Heap::IteratePointersInDirtyRegion(Address start, |
| 4139 | Address end, |
| 4140 | ObjectSlotCallback copy_object_func) { |
| 4141 | Address slot_address = start; |
| 4142 | bool pointers_to_new_space_found = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4143 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4144 | while (slot_address < end) { |
| 4145 | Object** slot = reinterpret_cast<Object**>(slot_address); |
| 4146 | if (Heap::InNewSpace(*slot)) { |
| 4147 | ASSERT((*slot)->IsHeapObject()); |
| 4148 | copy_object_func(reinterpret_cast<HeapObject**>(slot)); |
| 4149 | if (Heap::InNewSpace(*slot)) { |
| 4150 | ASSERT((*slot)->IsHeapObject()); |
| 4151 | pointers_to_new_space_found = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4152 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4153 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4154 | slot_address += kPointerSize; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4155 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4156 | return pointers_to_new_space_found; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4157 | } |
| 4158 | |
| 4159 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4160 | // Compute start address of the first map following given addr. |
| 4161 | static inline Address MapStartAlign(Address addr) { |
| 4162 | Address page = Page::FromAddress(addr)->ObjectAreaStart(); |
| 4163 | return page + (((addr - page) + (Map::kSize - 1)) / Map::kSize * Map::kSize); |
| 4164 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4165 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4166 | |
| 4167 | // Compute end address of the first map preceding given addr. |
| 4168 | static inline Address MapEndAlign(Address addr) { |
| 4169 | Address page = Page::FromAllocationTop(addr)->ObjectAreaStart(); |
| 4170 | return page + ((addr - page) / Map::kSize * Map::kSize); |
| 4171 | } |
| 4172 | |
| 4173 | |
| 4174 | static bool IteratePointersInDirtyMaps(Address start, |
| 4175 | Address end, |
| 4176 | ObjectSlotCallback copy_object_func) { |
| 4177 | ASSERT(MapStartAlign(start) == start); |
| 4178 | ASSERT(MapEndAlign(end) == end); |
| 4179 | |
| 4180 | Address map_address = start; |
| 4181 | bool pointers_to_new_space_found = false; |
| 4182 | |
| 4183 | while (map_address < end) { |
| 4184 | ASSERT(!Heap::InNewSpace(Memory::Object_at(map_address))); |
| 4185 | ASSERT(Memory::Object_at(map_address)->IsMap()); |
| 4186 | |
| 4187 | Address pointer_fields_start = map_address + Map::kPointerFieldsBeginOffset; |
| 4188 | Address pointer_fields_end = map_address + Map::kPointerFieldsEndOffset; |
| 4189 | |
| 4190 | if (Heap::IteratePointersInDirtyRegion(pointer_fields_start, |
| 4191 | pointer_fields_end, |
| 4192 | copy_object_func)) { |
| 4193 | pointers_to_new_space_found = true; |
| 4194 | } |
| 4195 | |
| 4196 | map_address += Map::kSize; |
| 4197 | } |
| 4198 | |
| 4199 | return pointers_to_new_space_found; |
| 4200 | } |
| 4201 | |
| 4202 | |
| 4203 | bool Heap::IteratePointersInDirtyMapsRegion( |
| 4204 | Address start, |
| 4205 | Address end, |
| 4206 | ObjectSlotCallback copy_object_func) { |
| 4207 | Address map_aligned_start = MapStartAlign(start); |
| 4208 | Address map_aligned_end = MapEndAlign(end); |
| 4209 | |
| 4210 | bool contains_pointers_to_new_space = false; |
| 4211 | |
| 4212 | if (map_aligned_start != start) { |
| 4213 | Address prev_map = map_aligned_start - Map::kSize; |
| 4214 | ASSERT(Memory::Object_at(prev_map)->IsMap()); |
| 4215 | |
| 4216 | Address pointer_fields_start = |
| 4217 | Max(start, prev_map + Map::kPointerFieldsBeginOffset); |
| 4218 | |
| 4219 | Address pointer_fields_end = |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4220 | Min(prev_map + Map::kPointerFieldsEndOffset, end); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4221 | |
| 4222 | contains_pointers_to_new_space = |
| 4223 | IteratePointersInDirtyRegion(pointer_fields_start, |
| 4224 | pointer_fields_end, |
| 4225 | copy_object_func) |
| 4226 | || contains_pointers_to_new_space; |
| 4227 | } |
| 4228 | |
| 4229 | contains_pointers_to_new_space = |
| 4230 | IteratePointersInDirtyMaps(map_aligned_start, |
| 4231 | map_aligned_end, |
| 4232 | copy_object_func) |
| 4233 | || contains_pointers_to_new_space; |
| 4234 | |
| 4235 | if (map_aligned_end != end) { |
| 4236 | ASSERT(Memory::Object_at(map_aligned_end)->IsMap()); |
| 4237 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4238 | Address pointer_fields_start = |
| 4239 | map_aligned_end + Map::kPointerFieldsBeginOffset; |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4240 | |
| 4241 | Address pointer_fields_end = |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4242 | Min(end, map_aligned_end + Map::kPointerFieldsEndOffset); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4243 | |
| 4244 | contains_pointers_to_new_space = |
| 4245 | IteratePointersInDirtyRegion(pointer_fields_start, |
| 4246 | pointer_fields_end, |
| 4247 | copy_object_func) |
| 4248 | || contains_pointers_to_new_space; |
| 4249 | } |
| 4250 | |
| 4251 | return contains_pointers_to_new_space; |
| 4252 | } |
| 4253 | |
| 4254 | |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4255 | void Heap::IterateAndMarkPointersToFromSpace(Address start, |
| 4256 | Address end, |
| 4257 | ObjectSlotCallback callback) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4258 | Address slot_address = start; |
| 4259 | Page* page = Page::FromAddress(start); |
| 4260 | |
| 4261 | uint32_t marks = page->GetRegionMarks(); |
| 4262 | |
| 4263 | while (slot_address < end) { |
| 4264 | Object** slot = reinterpret_cast<Object**>(slot_address); |
ager@chromium.org | 6a2b0aa | 2010-07-13 20:58:03 +0000 | [diff] [blame] | 4265 | if (Heap::InFromSpace(*slot)) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4266 | ASSERT((*slot)->IsHeapObject()); |
| 4267 | callback(reinterpret_cast<HeapObject**>(slot)); |
| 4268 | if (Heap::InNewSpace(*slot)) { |
| 4269 | ASSERT((*slot)->IsHeapObject()); |
| 4270 | marks |= page->GetRegionMaskForAddress(slot_address); |
| 4271 | } |
| 4272 | } |
| 4273 | slot_address += kPointerSize; |
| 4274 | } |
| 4275 | |
| 4276 | page->SetRegionMarks(marks); |
| 4277 | } |
| 4278 | |
| 4279 | |
| 4280 | uint32_t Heap::IterateDirtyRegions( |
| 4281 | uint32_t marks, |
| 4282 | Address area_start, |
| 4283 | Address area_end, |
| 4284 | DirtyRegionCallback visit_dirty_region, |
| 4285 | ObjectSlotCallback copy_object_func) { |
| 4286 | uint32_t newmarks = 0; |
| 4287 | uint32_t mask = 1; |
| 4288 | |
| 4289 | if (area_start >= area_end) { |
| 4290 | return newmarks; |
| 4291 | } |
| 4292 | |
| 4293 | Address region_start = area_start; |
| 4294 | |
| 4295 | // area_start does not necessarily coincide with start of the first region. |
| 4296 | // Thus to calculate the beginning of the next region we have to align |
| 4297 | // area_start by Page::kRegionSize. |
| 4298 | Address second_region = |
| 4299 | reinterpret_cast<Address>( |
| 4300 | reinterpret_cast<intptr_t>(area_start + Page::kRegionSize) & |
| 4301 | ~Page::kRegionAlignmentMask); |
| 4302 | |
| 4303 | // Next region might be beyond area_end. |
| 4304 | Address region_end = Min(second_region, area_end); |
| 4305 | |
| 4306 | if (marks & mask) { |
| 4307 | if (visit_dirty_region(region_start, region_end, copy_object_func)) { |
| 4308 | newmarks |= mask; |
| 4309 | } |
| 4310 | } |
| 4311 | mask <<= 1; |
| 4312 | |
| 4313 | // Iterate subsequent regions which fully lay inside [area_start, area_end[. |
| 4314 | region_start = region_end; |
| 4315 | region_end = region_start + Page::kRegionSize; |
| 4316 | |
| 4317 | while (region_end <= area_end) { |
| 4318 | if (marks & mask) { |
| 4319 | if (visit_dirty_region(region_start, region_end, copy_object_func)) { |
| 4320 | newmarks |= mask; |
| 4321 | } |
| 4322 | } |
| 4323 | |
| 4324 | region_start = region_end; |
| 4325 | region_end = region_start + Page::kRegionSize; |
| 4326 | |
| 4327 | mask <<= 1; |
| 4328 | } |
| 4329 | |
| 4330 | if (region_start != area_end) { |
| 4331 | // A small piece of area left uniterated because area_end does not coincide |
| 4332 | // with region end. Check whether region covering last part of area is |
| 4333 | // dirty. |
| 4334 | if (marks & mask) { |
| 4335 | if (visit_dirty_region(region_start, area_end, copy_object_func)) { |
| 4336 | newmarks |= mask; |
| 4337 | } |
| 4338 | } |
| 4339 | } |
| 4340 | |
| 4341 | return newmarks; |
| 4342 | } |
| 4343 | |
| 4344 | |
| 4345 | |
| 4346 | void Heap::IterateDirtyRegions( |
| 4347 | PagedSpace* space, |
| 4348 | DirtyRegionCallback visit_dirty_region, |
| 4349 | ObjectSlotCallback copy_object_func, |
| 4350 | ExpectedPageWatermarkState expected_page_watermark_state) { |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 4351 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4352 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4353 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4354 | while (it.has_next()) { |
| 4355 | Page* page = it.next(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4356 | uint32_t marks = page->GetRegionMarks(); |
| 4357 | |
| 4358 | if (marks != Page::kAllRegionsCleanMarks) { |
| 4359 | Address start = page->ObjectAreaStart(); |
| 4360 | |
| 4361 | // Do not try to visit pointers beyond page allocation watermark. |
| 4362 | // Page can contain garbage pointers there. |
| 4363 | Address end; |
| 4364 | |
| 4365 | if ((expected_page_watermark_state == WATERMARK_SHOULD_BE_VALID) || |
| 4366 | page->IsWatermarkValid()) { |
| 4367 | end = page->AllocationWatermark(); |
| 4368 | } else { |
| 4369 | end = page->CachedAllocationWatermark(); |
| 4370 | } |
| 4371 | |
| 4372 | ASSERT(space == old_pointer_space_ || |
| 4373 | (space == map_space_ && |
| 4374 | ((page->ObjectAreaStart() - end) % Map::kSize == 0))); |
| 4375 | |
| 4376 | page->SetRegionMarks(IterateDirtyRegions(marks, |
| 4377 | start, |
| 4378 | end, |
| 4379 | visit_dirty_region, |
| 4380 | copy_object_func)); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 4381 | } |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 4382 | |
| 4383 | // Mark page watermark as invalid to maintain watermark validity invariant. |
| 4384 | // See Page::FlipMeaningOfInvalidatedWatermarkFlag() for details. |
| 4385 | page->InvalidateWatermark(true); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4386 | } |
| 4387 | } |
| 4388 | |
| 4389 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4390 | void Heap::IterateRoots(ObjectVisitor* v, VisitMode mode) { |
| 4391 | IterateStrongRoots(v, mode); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4392 | IterateWeakRoots(v, mode); |
| 4393 | } |
| 4394 | |
| 4395 | |
| 4396 | void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4397 | v->VisitPointer(reinterpret_cast<Object**>(&roots_[kSymbolTableRootIndex])); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4398 | v->Synchronize("symbol_table"); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4399 | if (mode != VISIT_ALL_IN_SCAVENGE) { |
| 4400 | // Scavenge collections have special processing for this. |
| 4401 | ExternalStringTable::Iterate(v); |
| 4402 | } |
| 4403 | v->Synchronize("external_string_table"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4404 | } |
| 4405 | |
| 4406 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4407 | void Heap::IterateStrongRoots(ObjectVisitor* v, VisitMode mode) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 4408 | v->VisitPointers(&roots_[0], &roots_[kStrongRootListLength]); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4409 | v->Synchronize("strong_root_list"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4410 | |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 4411 | v->VisitPointer(BitCast<Object**>(&hidden_symbol_)); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4412 | v->Synchronize("symbol"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4413 | |
| 4414 | Bootstrapper::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4415 | v->Synchronize("bootstrapper"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4416 | Top::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4417 | v->Synchronize("top"); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4418 | Relocatable::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4419 | v->Synchronize("relocatable"); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 4420 | |
| 4421 | #ifdef ENABLE_DEBUGGER_SUPPORT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4422 | Debug::Iterate(v); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 4423 | #endif |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4424 | v->Synchronize("debug"); |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 4425 | CompilationCache::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4426 | v->Synchronize("compilationcache"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4427 | |
| 4428 | // Iterate over local handles in handle scopes. |
| 4429 | HandleScopeImplementer::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4430 | v->Synchronize("handlescope"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4431 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4432 | // Iterate over the builtin code objects and code stubs in the |
| 4433 | // heap. Note that it is not necessary to iterate over code objects |
| 4434 | // on scavenge collections. |
| 4435 | if (mode != VISIT_ALL_IN_SCAVENGE) { |
| 4436 | Builtins::IterateBuiltins(v); |
| 4437 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4438 | v->Synchronize("builtins"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4439 | |
| 4440 | // Iterate over global handles. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4441 | if (mode == VISIT_ONLY_STRONG) { |
| 4442 | GlobalHandles::IterateStrongRoots(v); |
| 4443 | } else { |
| 4444 | GlobalHandles::IterateAllRoots(v); |
| 4445 | } |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4446 | v->Synchronize("globalhandles"); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4447 | |
| 4448 | // Iterate over pointers being held by inactive threads. |
| 4449 | ThreadManager::Iterate(v); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4450 | v->Synchronize("threadmanager"); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4451 | |
| 4452 | // Iterate over the pointers the Serialization/Deserialization code is |
| 4453 | // holding. |
| 4454 | // During garbage collection this keeps the partial snapshot cache alive. |
| 4455 | // During deserialization of the startup snapshot this creates the partial |
| 4456 | // snapshot cache and deserializes the objects it refers to. During |
| 4457 | // serialization this does nothing, since the partial snapshot cache is |
| 4458 | // empty. However the next thing we do is create the partial snapshot, |
| 4459 | // filling up the partial snapshot cache with objects it needs as we go. |
| 4460 | SerializerDeserializer::Iterate(v); |
| 4461 | // We don't do a v->Synchronize call here, because in debug mode that will |
| 4462 | // output a flag to the snapshot. However at this point the serializer and |
| 4463 | // deserializer are deliberately a little unsynchronized (see above) so the |
| 4464 | // checking of the sync flag in the snapshot would fail. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4465 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4466 | |
| 4467 | |
| 4468 | // Flag is set when the heap has been configured. The heap can be repeatedly |
| 4469 | // configured through the API until it is setup. |
| 4470 | static bool heap_configured = false; |
| 4471 | |
| 4472 | // TODO(1236194): Since the heap size is configurable on the command line |
| 4473 | // and through the API, we should gracefully handle the case that the heap |
| 4474 | // size is not big enough to fit all the initial objects. |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 4475 | bool Heap::ConfigureHeap(int max_semispace_size, |
| 4476 | int max_old_gen_size, |
| 4477 | int max_executable_size) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4478 | if (HasBeenSetup()) return false; |
| 4479 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4480 | if (max_semispace_size > 0) max_semispace_size_ = max_semispace_size; |
| 4481 | |
| 4482 | if (Snapshot::IsEnabled()) { |
| 4483 | // If we are using a snapshot we always reserve the default amount |
| 4484 | // of memory for each semispace because code in the snapshot has |
| 4485 | // write-barrier code that relies on the size and alignment of new |
| 4486 | // space. We therefore cannot use a larger max semispace size |
| 4487 | // than the default reserved semispace size. |
| 4488 | if (max_semispace_size_ > reserved_semispace_size_) { |
| 4489 | max_semispace_size_ = reserved_semispace_size_; |
| 4490 | } |
| 4491 | } else { |
| 4492 | // If we are not using snapshots we reserve space for the actual |
| 4493 | // max semispace size. |
| 4494 | reserved_semispace_size_ = max_semispace_size_; |
| 4495 | } |
| 4496 | |
| 4497 | if (max_old_gen_size > 0) max_old_generation_size_ = max_old_gen_size; |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 4498 | if (max_executable_size > 0) { |
| 4499 | max_executable_size_ = RoundUp(max_executable_size, Page::kPageSize); |
| 4500 | } |
| 4501 | |
| 4502 | // The max executable size must be less than or equal to the max old |
| 4503 | // generation size. |
| 4504 | if (max_executable_size_ > max_old_generation_size_) { |
| 4505 | max_executable_size_ = max_old_generation_size_; |
| 4506 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4507 | |
| 4508 | // The new space size must be a power of two to support single-bit testing |
| 4509 | // for containment. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4510 | max_semispace_size_ = RoundUpToPowerOf2(max_semispace_size_); |
| 4511 | reserved_semispace_size_ = RoundUpToPowerOf2(reserved_semispace_size_); |
| 4512 | initial_semispace_size_ = Min(initial_semispace_size_, max_semispace_size_); |
| 4513 | external_allocation_limit_ = 10 * max_semispace_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4514 | |
| 4515 | // The old generation is paged. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4516 | max_old_generation_size_ = RoundUp(max_old_generation_size_, Page::kPageSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4517 | |
| 4518 | heap_configured = true; |
| 4519 | return true; |
| 4520 | } |
| 4521 | |
| 4522 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4523 | bool Heap::ConfigureHeapDefault() { |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 4524 | return ConfigureHeap(FLAG_max_new_space_size / 2 * KB, |
| 4525 | FLAG_max_old_space_size * MB, |
| 4526 | FLAG_max_executable_size * MB); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4527 | } |
| 4528 | |
| 4529 | |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4530 | void Heap::RecordStats(HeapStats* stats, bool take_snapshot) { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 4531 | *stats->start_marker = HeapStats::kStartMarker; |
| 4532 | *stats->end_marker = HeapStats::kEndMarker; |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4533 | *stats->new_space_size = new_space_.SizeAsInt(); |
| 4534 | *stats->new_space_capacity = static_cast<int>(new_space_.Capacity()); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 4535 | *stats->old_pointer_space_size = old_pointer_space_->Size(); |
| 4536 | *stats->old_pointer_space_capacity = old_pointer_space_->Capacity(); |
| 4537 | *stats->old_data_space_size = old_data_space_->Size(); |
| 4538 | *stats->old_data_space_capacity = old_data_space_->Capacity(); |
| 4539 | *stats->code_space_size = code_space_->Size(); |
| 4540 | *stats->code_space_capacity = code_space_->Capacity(); |
| 4541 | *stats->map_space_size = map_space_->Size(); |
| 4542 | *stats->map_space_capacity = map_space_->Capacity(); |
| 4543 | *stats->cell_space_size = cell_space_->Size(); |
| 4544 | *stats->cell_space_capacity = cell_space_->Capacity(); |
| 4545 | *stats->lo_space_size = lo_space_->Size(); |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 4546 | GlobalHandles::RecordStats(stats); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4547 | *stats->memory_allocator_size = MemoryAllocator::Size(); |
| 4548 | *stats->memory_allocator_capacity = |
| 4549 | MemoryAllocator::Size() + MemoryAllocator::Available(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 4550 | *stats->os_error = OS::GetLastError(); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4551 | if (take_snapshot) { |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 4552 | HeapIterator iterator(HeapIterator::kFilterFreeListNodes); |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4553 | for (HeapObject* obj = iterator.next(); |
| 4554 | obj != NULL; |
| 4555 | obj = iterator.next()) { |
lrn@chromium.org | c4e51ac | 2010-08-09 09:47:21 +0000 | [diff] [blame] | 4556 | InstanceType type = obj->map()->instance_type(); |
| 4557 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 4558 | stats->objects_per_type[type]++; |
| 4559 | stats->size_per_type[type] += obj->Size(); |
| 4560 | } |
| 4561 | } |
ager@chromium.org | 6012123 | 2009-12-03 11:25:37 +0000 | [diff] [blame] | 4562 | } |
| 4563 | |
| 4564 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4565 | intptr_t Heap::PromotedSpaceSize() { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4566 | return old_pointer_space_->Size() |
| 4567 | + old_data_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4568 | + code_space_->Size() |
| 4569 | + map_space_->Size() |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4570 | + cell_space_->Size() |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4571 | + lo_space_->Size(); |
| 4572 | } |
| 4573 | |
| 4574 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4575 | int Heap::PromotedExternalMemorySize() { |
| 4576 | if (amount_of_external_allocated_memory_ |
| 4577 | <= amount_of_external_allocated_memory_at_last_global_gc_) return 0; |
| 4578 | return amount_of_external_allocated_memory_ |
| 4579 | - amount_of_external_allocated_memory_at_last_global_gc_; |
| 4580 | } |
| 4581 | |
| 4582 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4583 | bool Heap::Setup(bool create_heap_objects) { |
| 4584 | // Initialize heap spaces and initial maps and objects. Whenever something |
| 4585 | // goes wrong, just return false. The caller should check the results and |
| 4586 | // call Heap::TearDown() to release allocated memory. |
| 4587 | // |
| 4588 | // If the heap is not yet configured (eg, through the API), configure it. |
| 4589 | // Configuration is based on the flags new-space-size (really the semispace |
| 4590 | // size) and old-space-size if set or the initial values of semispace_size_ |
| 4591 | // and old_generation_size_ otherwise. |
| 4592 | if (!heap_configured) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4593 | if (!ConfigureHeapDefault()) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4594 | } |
| 4595 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 4596 | ScavengingVisitor::Initialize(); |
| 4597 | NewSpaceScavenger::Initialize(); |
| 4598 | MarkCompactCollector::Initialize(); |
| 4599 | |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 4600 | MarkMapPointersAsEncoded(false); |
| 4601 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4602 | // Setup memory allocator and reserve a chunk of memory for new |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4603 | // space. The chunk is double the size of the requested reserved |
| 4604 | // new space size to ensure that we can find a pair of semispaces that |
| 4605 | // are contiguous and aligned to their size. |
ager@chromium.org | 01fe7df | 2010-11-10 11:59:11 +0000 | [diff] [blame] | 4606 | if (!MemoryAllocator::Setup(MaxReserved(), MaxExecutableSize())) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4607 | void* chunk = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4608 | MemoryAllocator::ReserveInitialChunk(4 * reserved_semispace_size_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4609 | if (chunk == NULL) return false; |
| 4610 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4611 | // Align the pair of semispaces to their size, which must be a power |
| 4612 | // of 2. |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4613 | Address new_space_start = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4614 | RoundUp(reinterpret_cast<byte*>(chunk), 2 * reserved_semispace_size_); |
| 4615 | if (!new_space_.Setup(new_space_start, 2 * reserved_semispace_size_)) { |
| 4616 | return false; |
| 4617 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4618 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4619 | // Initialize old pointer space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4620 | old_pointer_space_ = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4621 | new OldSpace(max_old_generation_size_, OLD_POINTER_SPACE, NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4622 | if (old_pointer_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4623 | if (!old_pointer_space_->Setup(NULL, 0)) return false; |
| 4624 | |
| 4625 | // Initialize old data space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4626 | old_data_space_ = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4627 | new OldSpace(max_old_generation_size_, OLD_DATA_SPACE, NOT_EXECUTABLE); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4628 | if (old_data_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4629 | if (!old_data_space_->Setup(NULL, 0)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4630 | |
| 4631 | // Initialize the code space, set its maximum capacity to the old |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4632 | // generation size. It needs executable memory. |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 4633 | // On 64-bit platform(s), we put all code objects in a 2 GB range of |
| 4634 | // virtual address space, so that they can call each other with near calls. |
| 4635 | if (code_range_size_ > 0) { |
| 4636 | if (!CodeRange::Setup(code_range_size_)) { |
| 4637 | return false; |
| 4638 | } |
| 4639 | } |
| 4640 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4641 | code_space_ = |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4642 | new OldSpace(max_old_generation_size_, CODE_SPACE, EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4643 | if (code_space_ == NULL) return false; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 4644 | if (!code_space_->Setup(NULL, 0)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4645 | |
| 4646 | // Initialize map space. |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4647 | map_space_ = new MapSpace(FLAG_use_big_map_space |
| 4648 | ? max_old_generation_size_ |
kasperl@chromium.org | eac059f | 2010-01-25 11:02:06 +0000 | [diff] [blame] | 4649 | : MapSpace::kMaxMapPageIndex * Page::kPageSize, |
| 4650 | FLAG_max_map_space_pages, |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 4651 | MAP_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4652 | if (map_space_ == NULL) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4653 | if (!map_space_->Setup(NULL, 0)) return false; |
| 4654 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4655 | // Initialize global property cell space. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4656 | cell_space_ = new CellSpace(max_old_generation_size_, CELL_SPACE); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4657 | if (cell_space_ == NULL) return false; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4658 | if (!cell_space_->Setup(NULL, 0)) return false; |
| 4659 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4660 | // The large object code space may contain code or data. We set the memory |
| 4661 | // to be non-executable here for safety, but this means we need to enable it |
| 4662 | // explicitly when allocating large code objects. |
| 4663 | lo_space_ = new LargeObjectSpace(LO_SPACE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4664 | if (lo_space_ == NULL) return false; |
| 4665 | if (!lo_space_->Setup()) return false; |
| 4666 | |
| 4667 | if (create_heap_objects) { |
| 4668 | // Create initial maps. |
| 4669 | if (!CreateInitialMaps()) return false; |
| 4670 | if (!CreateApiObjects()) return false; |
| 4671 | |
| 4672 | // Create initial objects |
| 4673 | if (!CreateInitialObjects()) return false; |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 4674 | |
| 4675 | global_contexts_list_ = undefined_value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4676 | } |
| 4677 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4678 | LOG(IntPtrTEvent("heap-capacity", Capacity())); |
| 4679 | LOG(IntPtrTEvent("heap-available", Available())); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4680 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4681 | #ifdef ENABLE_LOGGING_AND_PROFILING |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 4682 | // This should be called only after initial objects have been created. |
| 4683 | ProducerHeapProfile::Setup(); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 4684 | #endif |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 4685 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4686 | return true; |
| 4687 | } |
| 4688 | |
| 4689 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4690 | void Heap::SetStackLimits() { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 4691 | // On 64 bit machines, pointers are generally out of range of Smis. We write |
| 4692 | // something that looks like an out of range Smi to the GC. |
| 4693 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4694 | // Set up the special root array entries containing the stack limits. |
| 4695 | // 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] | 4696 | roots_[kStackLimitRootIndex] = |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 4697 | reinterpret_cast<Object*>( |
| 4698 | (StackGuard::jslimit() & ~kSmiTagMask) | kSmiTag); |
| 4699 | roots_[kRealStackLimitRootIndex] = |
| 4700 | reinterpret_cast<Object*>( |
| 4701 | (StackGuard::real_jslimit() & ~kSmiTagMask) | kSmiTag); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 4702 | } |
| 4703 | |
| 4704 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4705 | void Heap::TearDown() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4706 | if (FLAG_print_cumulative_gc_stat) { |
| 4707 | PrintF("\n\n"); |
| 4708 | PrintF("gc_count=%d ", gc_count_); |
| 4709 | PrintF("mark_sweep_count=%d ", ms_count_); |
| 4710 | PrintF("mark_compact_count=%d ", mc_count_); |
| 4711 | PrintF("max_gc_pause=%d ", GCTracer::get_max_gc_pause()); |
| 4712 | PrintF("min_in_mutator=%d ", GCTracer::get_min_in_mutator()); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4713 | PrintF("max_alive_after_gc=%" V8_PTR_PREFIX "d ", |
| 4714 | GCTracer::get_max_alive_after_gc()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 4715 | PrintF("\n\n"); |
| 4716 | } |
| 4717 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4718 | GlobalHandles::TearDown(); |
| 4719 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 4720 | ExternalStringTable::TearDown(); |
| 4721 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 4722 | new_space_.TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4723 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4724 | if (old_pointer_space_ != NULL) { |
| 4725 | old_pointer_space_->TearDown(); |
| 4726 | delete old_pointer_space_; |
| 4727 | old_pointer_space_ = NULL; |
| 4728 | } |
| 4729 | |
| 4730 | if (old_data_space_ != NULL) { |
| 4731 | old_data_space_->TearDown(); |
| 4732 | delete old_data_space_; |
| 4733 | old_data_space_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4734 | } |
| 4735 | |
| 4736 | if (code_space_ != NULL) { |
| 4737 | code_space_->TearDown(); |
| 4738 | delete code_space_; |
| 4739 | code_space_ = NULL; |
| 4740 | } |
| 4741 | |
| 4742 | if (map_space_ != NULL) { |
| 4743 | map_space_->TearDown(); |
| 4744 | delete map_space_; |
| 4745 | map_space_ = NULL; |
| 4746 | } |
| 4747 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4748 | if (cell_space_ != NULL) { |
| 4749 | cell_space_->TearDown(); |
| 4750 | delete cell_space_; |
| 4751 | cell_space_ = NULL; |
| 4752 | } |
| 4753 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4754 | if (lo_space_ != NULL) { |
| 4755 | lo_space_->TearDown(); |
| 4756 | delete lo_space_; |
| 4757 | lo_space_ = NULL; |
| 4758 | } |
| 4759 | |
| 4760 | MemoryAllocator::TearDown(); |
| 4761 | } |
| 4762 | |
| 4763 | |
| 4764 | void Heap::Shrink() { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4765 | // Try to shrink all paged spaces. |
| 4766 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4767 | for (PagedSpace* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4768 | space->Shrink(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4769 | } |
| 4770 | |
| 4771 | |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 4772 | #ifdef ENABLE_HEAP_PROTECTION |
| 4773 | |
| 4774 | void Heap::Protect() { |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4775 | if (HasBeenSetup()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4776 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4777 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4778 | space->Protect(); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4779 | } |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 4780 | } |
| 4781 | |
| 4782 | |
| 4783 | void Heap::Unprotect() { |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4784 | if (HasBeenSetup()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4785 | AllSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 4786 | for (Space* space = spaces.next(); space != NULL; space = spaces.next()) |
| 4787 | space->Unprotect(); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 4788 | } |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 4789 | } |
| 4790 | |
| 4791 | #endif |
| 4792 | |
| 4793 | |
kmillikin@chromium.org | 5d8f0e6 | 2010-03-24 08:21:20 +0000 | [diff] [blame] | 4794 | void Heap::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) { |
| 4795 | ASSERT(callback != NULL); |
| 4796 | GCPrologueCallbackPair pair(callback, gc_type); |
| 4797 | ASSERT(!gc_prologue_callbacks_.Contains(pair)); |
| 4798 | return gc_prologue_callbacks_.Add(pair); |
| 4799 | } |
| 4800 | |
| 4801 | |
| 4802 | void Heap::RemoveGCPrologueCallback(GCPrologueCallback callback) { |
| 4803 | ASSERT(callback != NULL); |
| 4804 | for (int i = 0; i < gc_prologue_callbacks_.length(); ++i) { |
| 4805 | if (gc_prologue_callbacks_[i].callback == callback) { |
| 4806 | gc_prologue_callbacks_.Remove(i); |
| 4807 | return; |
| 4808 | } |
| 4809 | } |
| 4810 | UNREACHABLE(); |
| 4811 | } |
| 4812 | |
| 4813 | |
| 4814 | void Heap::AddGCEpilogueCallback(GCEpilogueCallback callback, GCType gc_type) { |
| 4815 | ASSERT(callback != NULL); |
| 4816 | GCEpilogueCallbackPair pair(callback, gc_type); |
| 4817 | ASSERT(!gc_epilogue_callbacks_.Contains(pair)); |
| 4818 | return gc_epilogue_callbacks_.Add(pair); |
| 4819 | } |
| 4820 | |
| 4821 | |
| 4822 | void Heap::RemoveGCEpilogueCallback(GCEpilogueCallback callback) { |
| 4823 | ASSERT(callback != NULL); |
| 4824 | for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) { |
| 4825 | if (gc_epilogue_callbacks_[i].callback == callback) { |
| 4826 | gc_epilogue_callbacks_.Remove(i); |
| 4827 | return; |
| 4828 | } |
| 4829 | } |
| 4830 | UNREACHABLE(); |
| 4831 | } |
| 4832 | |
| 4833 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4834 | #ifdef DEBUG |
| 4835 | |
| 4836 | class PrintHandleVisitor: public ObjectVisitor { |
| 4837 | public: |
| 4838 | void VisitPointers(Object** start, Object** end) { |
| 4839 | for (Object** p = start; p < end; p++) |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 4840 | PrintF(" handle %p to %p\n", |
| 4841 | reinterpret_cast<void*>(p), |
| 4842 | reinterpret_cast<void*>(*p)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 4843 | } |
| 4844 | }; |
| 4845 | |
| 4846 | void Heap::PrintHandles() { |
| 4847 | PrintF("Handles:\n"); |
| 4848 | PrintHandleVisitor v; |
| 4849 | HandleScopeImplementer::Iterate(&v); |
| 4850 | } |
| 4851 | |
| 4852 | #endif |
| 4853 | |
| 4854 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4855 | Space* AllSpaces::next() { |
| 4856 | switch (counter_++) { |
| 4857 | case NEW_SPACE: |
| 4858 | return Heap::new_space(); |
| 4859 | case OLD_POINTER_SPACE: |
| 4860 | return Heap::old_pointer_space(); |
| 4861 | case OLD_DATA_SPACE: |
| 4862 | return Heap::old_data_space(); |
| 4863 | case CODE_SPACE: |
| 4864 | return Heap::code_space(); |
| 4865 | case MAP_SPACE: |
| 4866 | return Heap::map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4867 | case CELL_SPACE: |
| 4868 | return Heap::cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4869 | case LO_SPACE: |
| 4870 | return Heap::lo_space(); |
| 4871 | default: |
| 4872 | return NULL; |
| 4873 | } |
| 4874 | } |
| 4875 | |
| 4876 | |
| 4877 | PagedSpace* PagedSpaces::next() { |
| 4878 | switch (counter_++) { |
| 4879 | case OLD_POINTER_SPACE: |
| 4880 | return Heap::old_pointer_space(); |
| 4881 | case OLD_DATA_SPACE: |
| 4882 | return Heap::old_data_space(); |
| 4883 | case CODE_SPACE: |
| 4884 | return Heap::code_space(); |
| 4885 | case MAP_SPACE: |
| 4886 | return Heap::map_space(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4887 | case CELL_SPACE: |
| 4888 | return Heap::cell_space(); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4889 | default: |
| 4890 | return NULL; |
| 4891 | } |
| 4892 | } |
| 4893 | |
| 4894 | |
| 4895 | |
| 4896 | OldSpace* OldSpaces::next() { |
| 4897 | switch (counter_++) { |
| 4898 | case OLD_POINTER_SPACE: |
| 4899 | return Heap::old_pointer_space(); |
| 4900 | case OLD_DATA_SPACE: |
| 4901 | return Heap::old_data_space(); |
| 4902 | case CODE_SPACE: |
| 4903 | return Heap::code_space(); |
| 4904 | default: |
| 4905 | return NULL; |
| 4906 | } |
| 4907 | } |
| 4908 | |
| 4909 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4910 | SpaceIterator::SpaceIterator() |
| 4911 | : current_space_(FIRST_SPACE), |
| 4912 | iterator_(NULL), |
| 4913 | size_func_(NULL) { |
| 4914 | } |
| 4915 | |
| 4916 | |
| 4917 | SpaceIterator::SpaceIterator(HeapObjectCallback size_func) |
| 4918 | : current_space_(FIRST_SPACE), |
| 4919 | iterator_(NULL), |
| 4920 | size_func_(size_func) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4921 | } |
| 4922 | |
| 4923 | |
| 4924 | SpaceIterator::~SpaceIterator() { |
| 4925 | // Delete active iterator if any. |
| 4926 | delete iterator_; |
| 4927 | } |
| 4928 | |
| 4929 | |
| 4930 | bool SpaceIterator::has_next() { |
| 4931 | // Iterate until no more spaces. |
| 4932 | return current_space_ != LAST_SPACE; |
| 4933 | } |
| 4934 | |
| 4935 | |
| 4936 | ObjectIterator* SpaceIterator::next() { |
| 4937 | if (iterator_ != NULL) { |
| 4938 | delete iterator_; |
| 4939 | iterator_ = NULL; |
| 4940 | // Move to the next space |
| 4941 | current_space_++; |
| 4942 | if (current_space_ > LAST_SPACE) { |
| 4943 | return NULL; |
| 4944 | } |
| 4945 | } |
| 4946 | |
| 4947 | // Return iterator for the new current space. |
| 4948 | return CreateIterator(); |
| 4949 | } |
| 4950 | |
| 4951 | |
| 4952 | // Create an iterator for the space to iterate. |
| 4953 | ObjectIterator* SpaceIterator::CreateIterator() { |
| 4954 | ASSERT(iterator_ == NULL); |
| 4955 | |
| 4956 | switch (current_space_) { |
| 4957 | case NEW_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4958 | iterator_ = new SemiSpaceIterator(Heap::new_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4959 | break; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4960 | case OLD_POINTER_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4961 | iterator_ = new HeapObjectIterator(Heap::old_pointer_space(), size_func_); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 4962 | break; |
| 4963 | case OLD_DATA_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4964 | iterator_ = new HeapObjectIterator(Heap::old_data_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4965 | break; |
| 4966 | case CODE_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4967 | iterator_ = new HeapObjectIterator(Heap::code_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4968 | break; |
| 4969 | case MAP_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4970 | iterator_ = new HeapObjectIterator(Heap::map_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4971 | break; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4972 | case CELL_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4973 | iterator_ = new HeapObjectIterator(Heap::cell_space(), size_func_); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 4974 | break; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4975 | case LO_SPACE: |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4976 | iterator_ = new LargeObjectIterator(Heap::lo_space(), size_func_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 4977 | break; |
| 4978 | } |
| 4979 | |
| 4980 | // Return the newly allocated iterator; |
| 4981 | ASSERT(iterator_ != NULL); |
| 4982 | return iterator_; |
| 4983 | } |
| 4984 | |
| 4985 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 4986 | class HeapObjectsFilter { |
| 4987 | public: |
| 4988 | virtual ~HeapObjectsFilter() {} |
| 4989 | virtual bool SkipObject(HeapObject* object) = 0; |
| 4990 | }; |
| 4991 | |
| 4992 | |
| 4993 | class FreeListNodesFilter : public HeapObjectsFilter { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 4994 | public: |
| 4995 | FreeListNodesFilter() { |
| 4996 | MarkFreeListNodes(); |
| 4997 | } |
| 4998 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 4999 | bool SkipObject(HeapObject* object) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5000 | if (object->IsMarked()) { |
| 5001 | object->ClearMark(); |
| 5002 | return true; |
| 5003 | } else { |
| 5004 | return false; |
| 5005 | } |
| 5006 | } |
| 5007 | |
| 5008 | private: |
| 5009 | void MarkFreeListNodes() { |
| 5010 | Heap::old_pointer_space()->MarkFreeListNodes(); |
| 5011 | Heap::old_data_space()->MarkFreeListNodes(); |
| 5012 | MarkCodeSpaceFreeListNodes(); |
| 5013 | Heap::map_space()->MarkFreeListNodes(); |
| 5014 | Heap::cell_space()->MarkFreeListNodes(); |
| 5015 | } |
| 5016 | |
| 5017 | void MarkCodeSpaceFreeListNodes() { |
| 5018 | // For code space, using FreeListNode::IsFreeListNode is OK. |
| 5019 | HeapObjectIterator iter(Heap::code_space()); |
| 5020 | for (HeapObject* obj = iter.next_object(); |
| 5021 | obj != NULL; |
| 5022 | obj = iter.next_object()) { |
| 5023 | if (FreeListNode::IsFreeListNode(obj)) obj->SetMark(); |
| 5024 | } |
| 5025 | } |
| 5026 | |
| 5027 | AssertNoAllocation no_alloc; |
| 5028 | }; |
| 5029 | |
| 5030 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5031 | class UnreachableObjectsFilter : public HeapObjectsFilter { |
| 5032 | public: |
| 5033 | UnreachableObjectsFilter() { |
| 5034 | MarkUnreachableObjects(); |
| 5035 | } |
| 5036 | |
| 5037 | bool SkipObject(HeapObject* object) { |
| 5038 | if (object->IsMarked()) { |
| 5039 | object->ClearMark(); |
| 5040 | return true; |
| 5041 | } else { |
| 5042 | return false; |
| 5043 | } |
| 5044 | } |
| 5045 | |
| 5046 | private: |
| 5047 | class UnmarkingVisitor : public ObjectVisitor { |
| 5048 | public: |
| 5049 | UnmarkingVisitor() : list_(10) {} |
| 5050 | |
| 5051 | void VisitPointers(Object** start, Object** end) { |
| 5052 | for (Object** p = start; p < end; p++) { |
| 5053 | if (!(*p)->IsHeapObject()) continue; |
| 5054 | HeapObject* obj = HeapObject::cast(*p); |
| 5055 | if (obj->IsMarked()) { |
| 5056 | obj->ClearMark(); |
| 5057 | list_.Add(obj); |
| 5058 | } |
| 5059 | } |
| 5060 | } |
| 5061 | |
| 5062 | bool can_process() { return !list_.is_empty(); } |
| 5063 | |
| 5064 | void ProcessNext() { |
| 5065 | HeapObject* obj = list_.RemoveLast(); |
| 5066 | obj->Iterate(this); |
| 5067 | } |
| 5068 | |
| 5069 | private: |
| 5070 | List<HeapObject*> list_; |
| 5071 | }; |
| 5072 | |
| 5073 | void MarkUnreachableObjects() { |
| 5074 | HeapIterator iterator; |
| 5075 | for (HeapObject* obj = iterator.next(); |
| 5076 | obj != NULL; |
| 5077 | obj = iterator.next()) { |
| 5078 | obj->SetMark(); |
| 5079 | } |
| 5080 | UnmarkingVisitor visitor; |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 5081 | Heap::IterateRoots(&visitor, VISIT_ALL); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5082 | while (visitor.can_process()) |
| 5083 | visitor.ProcessNext(); |
| 5084 | } |
| 5085 | |
| 5086 | AssertNoAllocation no_alloc; |
| 5087 | }; |
| 5088 | |
| 5089 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5090 | HeapIterator::HeapIterator() |
| 5091 | : filtering_(HeapIterator::kNoFiltering), |
| 5092 | filter_(NULL) { |
| 5093 | Init(); |
| 5094 | } |
| 5095 | |
| 5096 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5097 | HeapIterator::HeapIterator(HeapIterator::HeapObjectsFiltering filtering) |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5098 | : filtering_(filtering), |
| 5099 | filter_(NULL) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5100 | Init(); |
| 5101 | } |
| 5102 | |
| 5103 | |
| 5104 | HeapIterator::~HeapIterator() { |
| 5105 | Shutdown(); |
| 5106 | } |
| 5107 | |
| 5108 | |
| 5109 | void HeapIterator::Init() { |
| 5110 | // Start the iteration. |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5111 | space_iterator_ = filtering_ == kNoFiltering ? new SpaceIterator : |
| 5112 | new SpaceIterator(MarkCompactCollector::SizeOfMarkedObject); |
| 5113 | switch (filtering_) { |
| 5114 | case kFilterFreeListNodes: |
| 5115 | filter_ = new FreeListNodesFilter; |
| 5116 | break; |
| 5117 | case kFilterUnreachable: |
| 5118 | filter_ = new UnreachableObjectsFilter; |
| 5119 | break; |
| 5120 | default: |
| 5121 | break; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5122 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5123 | object_iterator_ = space_iterator_->next(); |
| 5124 | } |
| 5125 | |
| 5126 | |
| 5127 | void HeapIterator::Shutdown() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5128 | #ifdef DEBUG |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5129 | // Assert that in filtering mode we have iterated through all |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5130 | // objects. Otherwise, heap will be left in an inconsistent state. |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5131 | if (filtering_ != kNoFiltering) { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5132 | ASSERT(object_iterator_ == NULL); |
| 5133 | } |
| 5134 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5135 | // Make sure the last iterator is deallocated. |
| 5136 | delete space_iterator_; |
| 5137 | space_iterator_ = NULL; |
| 5138 | object_iterator_ = NULL; |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5139 | delete filter_; |
| 5140 | filter_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5141 | } |
| 5142 | |
| 5143 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5144 | HeapObject* HeapIterator::next() { |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5145 | if (filter_ == NULL) return NextObject(); |
| 5146 | |
| 5147 | HeapObject* obj = NextObject(); |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 5148 | while (obj != NULL && filter_->SkipObject(obj)) obj = NextObject(); |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 5149 | return obj; |
| 5150 | } |
| 5151 | |
| 5152 | |
| 5153 | HeapObject* HeapIterator::NextObject() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5154 | // No iterator means we are done. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5155 | if (object_iterator_ == NULL) return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5156 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5157 | if (HeapObject* obj = object_iterator_->next_object()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5158 | // If the current iterator has more objects we are fine. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5159 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5160 | } else { |
| 5161 | // Go though the spaces looking for one that has objects. |
| 5162 | while (space_iterator_->has_next()) { |
| 5163 | object_iterator_ = space_iterator_->next(); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5164 | if (HeapObject* obj = object_iterator_->next_object()) { |
| 5165 | return obj; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5166 | } |
| 5167 | } |
| 5168 | } |
| 5169 | // Done with the last space. |
| 5170 | object_iterator_ = NULL; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 5171 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5172 | } |
| 5173 | |
| 5174 | |
| 5175 | void HeapIterator::reset() { |
| 5176 | // Restart the iterator. |
| 5177 | Shutdown(); |
| 5178 | Init(); |
| 5179 | } |
| 5180 | |
| 5181 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5182 | #if defined(DEBUG) || defined(LIVE_OBJECT_LIST) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5183 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5184 | Object* const PathTracer::kAnyGlobalObject = reinterpret_cast<Object*>(NULL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5185 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5186 | class PathTracer::MarkVisitor: public ObjectVisitor { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5187 | public: |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5188 | explicit MarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5189 | void VisitPointers(Object** start, Object** end) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5190 | // Scan all HeapObject pointers in [start, end) |
| 5191 | for (Object** p = start; !tracer_->found() && (p < end); p++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5192 | if ((*p)->IsHeapObject()) |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5193 | tracer_->MarkRecursively(p, this); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5194 | } |
| 5195 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5196 | |
| 5197 | private: |
| 5198 | PathTracer* tracer_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5199 | }; |
| 5200 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5201 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5202 | class PathTracer::UnmarkVisitor: public ObjectVisitor { |
| 5203 | public: |
| 5204 | explicit UnmarkVisitor(PathTracer* tracer) : tracer_(tracer) {} |
| 5205 | void VisitPointers(Object** start, Object** end) { |
| 5206 | // Scan all HeapObject pointers in [start, end) |
| 5207 | for (Object** p = start; p < end; p++) { |
| 5208 | if ((*p)->IsHeapObject()) |
| 5209 | tracer_->UnmarkRecursively(p, this); |
| 5210 | } |
| 5211 | } |
| 5212 | |
| 5213 | private: |
| 5214 | PathTracer* tracer_; |
| 5215 | }; |
| 5216 | |
| 5217 | |
| 5218 | void PathTracer::VisitPointers(Object** start, Object** end) { |
| 5219 | bool done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 5220 | // Visit all HeapObject pointers in [start, end) |
| 5221 | for (Object** p = start; !done && (p < end); p++) { |
| 5222 | if ((*p)->IsHeapObject()) { |
| 5223 | TracePathFrom(p); |
| 5224 | done = ((what_to_find_ == FIND_FIRST) && found_target_); |
| 5225 | } |
| 5226 | } |
| 5227 | } |
| 5228 | |
| 5229 | |
| 5230 | void PathTracer::Reset() { |
| 5231 | found_target_ = false; |
| 5232 | object_stack_.Clear(); |
| 5233 | } |
| 5234 | |
| 5235 | |
| 5236 | void PathTracer::TracePathFrom(Object** root) { |
| 5237 | ASSERT((search_target_ == kAnyGlobalObject) || |
| 5238 | search_target_->IsHeapObject()); |
| 5239 | found_target_in_trace_ = false; |
| 5240 | object_stack_.Clear(); |
| 5241 | |
| 5242 | MarkVisitor mark_visitor(this); |
| 5243 | MarkRecursively(root, &mark_visitor); |
| 5244 | |
| 5245 | UnmarkVisitor unmark_visitor(this); |
| 5246 | UnmarkRecursively(root, &unmark_visitor); |
| 5247 | |
| 5248 | ProcessResults(); |
| 5249 | } |
| 5250 | |
| 5251 | |
| 5252 | void PathTracer::MarkRecursively(Object** p, MarkVisitor* mark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5253 | if (!(*p)->IsHeapObject()) return; |
| 5254 | |
| 5255 | HeapObject* obj = HeapObject::cast(*p); |
| 5256 | |
| 5257 | Object* map = obj->map(); |
| 5258 | |
| 5259 | if (!map->IsHeapObject()) return; // visited before |
| 5260 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5261 | if (found_target_in_trace_) return; // stop if target found |
| 5262 | object_stack_.Add(obj); |
| 5263 | if (((search_target_ == kAnyGlobalObject) && obj->IsJSGlobalObject()) || |
| 5264 | (obj == search_target_)) { |
| 5265 | found_target_in_trace_ = true; |
| 5266 | found_target_ = true; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5267 | return; |
| 5268 | } |
| 5269 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5270 | bool is_global_context = obj->IsGlobalContext(); |
| 5271 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5272 | // not visited yet |
| 5273 | Map* map_p = reinterpret_cast<Map*>(HeapObject::cast(map)); |
| 5274 | |
| 5275 | Address map_addr = map_p->address(); |
| 5276 | |
| 5277 | obj->set_map(reinterpret_cast<Map*>(map_addr + kMarkTag)); |
| 5278 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5279 | // Scan the object body. |
| 5280 | if (is_global_context && (visit_mode_ == VISIT_ONLY_STRONG)) { |
| 5281 | // This is specialized to scan Context's properly. |
| 5282 | Object** start = reinterpret_cast<Object**>(obj->address() + |
| 5283 | Context::kHeaderSize); |
| 5284 | Object** end = reinterpret_cast<Object**>(obj->address() + |
| 5285 | Context::kHeaderSize + Context::FIRST_WEAK_SLOT * kPointerSize); |
| 5286 | mark_visitor->VisitPointers(start, end); |
| 5287 | } else { |
| 5288 | obj->IterateBody(map_p->instance_type(), |
| 5289 | obj->SizeFromMap(map_p), |
| 5290 | mark_visitor); |
| 5291 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5292 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5293 | // Scan the map after the body because the body is a lot more interesting |
| 5294 | // when doing leak detection. |
| 5295 | MarkRecursively(&map, mark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5296 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5297 | if (!found_target_in_trace_) // don't pop if found the target |
| 5298 | object_stack_.RemoveLast(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5299 | } |
| 5300 | |
| 5301 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5302 | void PathTracer::UnmarkRecursively(Object** p, UnmarkVisitor* unmark_visitor) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5303 | if (!(*p)->IsHeapObject()) return; |
| 5304 | |
| 5305 | HeapObject* obj = HeapObject::cast(*p); |
| 5306 | |
| 5307 | Object* map = obj->map(); |
| 5308 | |
| 5309 | if (map->IsHeapObject()) return; // unmarked already |
| 5310 | |
| 5311 | Address map_addr = reinterpret_cast<Address>(map); |
| 5312 | |
| 5313 | map_addr -= kMarkTag; |
| 5314 | |
| 5315 | ASSERT_TAG_ALIGNED(map_addr); |
| 5316 | |
| 5317 | HeapObject* map_p = HeapObject::FromAddress(map_addr); |
| 5318 | |
| 5319 | obj->set_map(reinterpret_cast<Map*>(map_p)); |
| 5320 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5321 | UnmarkRecursively(reinterpret_cast<Object**>(&map_p), unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5322 | |
| 5323 | obj->IterateBody(Map::cast(map_p)->instance_type(), |
| 5324 | obj->SizeFromMap(Map::cast(map_p)), |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5325 | unmark_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5326 | } |
| 5327 | |
| 5328 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5329 | void PathTracer::ProcessResults() { |
| 5330 | if (found_target_) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5331 | PrintF("=====================================\n"); |
| 5332 | PrintF("==== Path to object ====\n"); |
| 5333 | PrintF("=====================================\n\n"); |
| 5334 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5335 | ASSERT(!object_stack_.is_empty()); |
| 5336 | for (int i = 0; i < object_stack_.length(); i++) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5337 | if (i > 0) PrintF("\n |\n |\n V\n\n"); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5338 | Object* obj = object_stack_[i]; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5339 | obj->Print(); |
| 5340 | } |
| 5341 | PrintF("=====================================\n"); |
| 5342 | } |
| 5343 | } |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5344 | #endif // DEBUG || LIVE_OBJECT_LIST |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5345 | |
| 5346 | |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5347 | #ifdef DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5348 | // Triggers a depth-first traversal of reachable objects from roots |
| 5349 | // 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] | 5350 | void Heap::TracePathToObject(Object* target) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5351 | PathTracer tracer(target, PathTracer::FIND_ALL, VISIT_ALL); |
| 5352 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5353 | } |
| 5354 | |
| 5355 | |
| 5356 | // Triggers a depth-first traversal of reachable objects from roots |
| 5357 | // and finds a path to any global object and prints it. Useful for |
| 5358 | // determining the source for leaks of global objects. |
| 5359 | void Heap::TracePathToGlobal() { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame^] | 5360 | PathTracer tracer(PathTracer::kAnyGlobalObject, |
| 5361 | PathTracer::FIND_ALL, |
| 5362 | VISIT_ALL); |
| 5363 | IterateRoots(&tracer, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5364 | } |
| 5365 | #endif |
| 5366 | |
| 5367 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5368 | static intptr_t CountTotalHolesSize() { |
| 5369 | intptr_t holes_size = 0; |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5370 | OldSpaces spaces; |
| 5371 | for (OldSpace* space = spaces.next(); |
| 5372 | space != NULL; |
| 5373 | space = spaces.next()) { |
| 5374 | holes_size += space->Waste() + space->AvailableFree(); |
| 5375 | } |
| 5376 | return holes_size; |
| 5377 | } |
| 5378 | |
| 5379 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5380 | GCTracer::GCTracer() |
| 5381 | : start_time_(0.0), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5382 | start_size_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5383 | gc_count_(0), |
| 5384 | full_gc_count_(0), |
| 5385 | is_compacting_(false), |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5386 | marked_count_(0), |
| 5387 | allocated_since_last_gc_(0), |
| 5388 | spent_in_mutator_(0), |
| 5389 | promoted_objects_size_(0) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5390 | // These two fields reflect the state of the previous full collection. |
| 5391 | // Set them before they are changed by the collector. |
| 5392 | previous_has_compacted_ = MarkCompactCollector::HasCompacted(); |
| 5393 | previous_marked_count_ = MarkCompactCollector::previous_marked_count(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5394 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5395 | start_time_ = OS::TimeCurrentMillis(); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5396 | start_size_ = Heap::SizeOfObjects(); |
| 5397 | |
| 5398 | for (int i = 0; i < Scope::kNumberOfScopes; i++) { |
| 5399 | scopes_[i] = 0; |
| 5400 | } |
| 5401 | |
| 5402 | in_free_list_or_wasted_before_gc_ = CountTotalHolesSize(); |
| 5403 | |
| 5404 | allocated_since_last_gc_ = Heap::SizeOfObjects() - alive_after_last_gc_; |
| 5405 | |
| 5406 | if (last_gc_end_timestamp_ > 0) { |
| 5407 | spent_in_mutator_ = Max(start_time_ - last_gc_end_timestamp_, 0.0); |
| 5408 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5409 | } |
| 5410 | |
| 5411 | |
| 5412 | GCTracer::~GCTracer() { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5413 | // Printf ONE line iff flag is set. |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5414 | if (!FLAG_trace_gc && !FLAG_print_cumulative_gc_stat) return; |
| 5415 | |
| 5416 | bool first_gc = (last_gc_end_timestamp_ == 0); |
| 5417 | |
| 5418 | alive_after_last_gc_ = Heap::SizeOfObjects(); |
| 5419 | last_gc_end_timestamp_ = OS::TimeCurrentMillis(); |
| 5420 | |
| 5421 | int time = static_cast<int>(last_gc_end_timestamp_ - start_time_); |
| 5422 | |
| 5423 | // Update cumulative GC statistics if required. |
| 5424 | if (FLAG_print_cumulative_gc_stat) { |
| 5425 | max_gc_pause_ = Max(max_gc_pause_, time); |
| 5426 | max_alive_after_gc_ = Max(max_alive_after_gc_, alive_after_last_gc_); |
| 5427 | if (!first_gc) { |
| 5428 | min_in_mutator_ = Min(min_in_mutator_, |
| 5429 | static_cast<int>(spent_in_mutator_)); |
| 5430 | } |
| 5431 | } |
| 5432 | |
| 5433 | if (!FLAG_trace_gc_nvp) { |
| 5434 | int external_time = static_cast<int>(scopes_[Scope::EXTERNAL]); |
| 5435 | |
| 5436 | PrintF("%s %.1f -> %.1f MB, ", |
| 5437 | CollectorString(), |
| 5438 | static_cast<double>(start_size_) / MB, |
| 5439 | SizeOfHeapObjects()); |
| 5440 | |
| 5441 | if (external_time > 0) PrintF("%d / ", external_time); |
| 5442 | PrintF("%d ms.\n", time); |
| 5443 | } else { |
| 5444 | PrintF("pause=%d ", time); |
| 5445 | PrintF("mutator=%d ", |
| 5446 | static_cast<int>(spent_in_mutator_)); |
| 5447 | |
| 5448 | PrintF("gc="); |
| 5449 | switch (collector_) { |
| 5450 | case SCAVENGER: |
| 5451 | PrintF("s"); |
| 5452 | break; |
| 5453 | case MARK_COMPACTOR: |
| 5454 | PrintF(MarkCompactCollector::HasCompacted() ? "mc" : "ms"); |
| 5455 | break; |
| 5456 | default: |
| 5457 | UNREACHABLE(); |
| 5458 | } |
| 5459 | PrintF(" "); |
| 5460 | |
| 5461 | PrintF("external=%d ", static_cast<int>(scopes_[Scope::EXTERNAL])); |
| 5462 | PrintF("mark=%d ", static_cast<int>(scopes_[Scope::MC_MARK])); |
| 5463 | PrintF("sweep=%d ", static_cast<int>(scopes_[Scope::MC_SWEEP])); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 5464 | 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] | 5465 | PrintF("compact=%d ", static_cast<int>(scopes_[Scope::MC_COMPACT])); |
| 5466 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5467 | PrintF("total_size_before=%" V8_PTR_PREFIX "d ", start_size_); |
| 5468 | PrintF("total_size_after=%" V8_PTR_PREFIX "d ", Heap::SizeOfObjects()); |
| 5469 | PrintF("holes_size_before=%" V8_PTR_PREFIX "d ", |
| 5470 | in_free_list_or_wasted_before_gc_); |
| 5471 | PrintF("holes_size_after=%" V8_PTR_PREFIX "d ", CountTotalHolesSize()); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5472 | |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 5473 | PrintF("allocated=%" V8_PTR_PREFIX "d ", allocated_since_last_gc_); |
| 5474 | PrintF("promoted=%" V8_PTR_PREFIX "d ", promoted_objects_size_); |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 5475 | |
| 5476 | PrintF("\n"); |
| 5477 | } |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 5478 | |
| 5479 | #if defined(ENABLE_LOGGING_AND_PROFILING) |
| 5480 | Heap::PrintShortHeapStatistics(); |
| 5481 | #endif |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 5482 | } |
| 5483 | |
| 5484 | |
| 5485 | const char* GCTracer::CollectorString() { |
| 5486 | switch (collector_) { |
| 5487 | case SCAVENGER: |
| 5488 | return "Scavenge"; |
| 5489 | case MARK_COMPACTOR: |
| 5490 | return MarkCompactCollector::HasCompacted() ? "Mark-compact" |
| 5491 | : "Mark-sweep"; |
| 5492 | } |
| 5493 | return "Unknown GC"; |
| 5494 | } |
| 5495 | |
| 5496 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 5497 | int KeyedLookupCache::Hash(Map* map, String* name) { |
| 5498 | // Uses only lower 32 bits if pointers are larger. |
| 5499 | uintptr_t addr_hash = |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5500 | static_cast<uint32_t>(reinterpret_cast<uintptr_t>(map)) >> kMapHashShift; |
fschneider@chromium.org | b95b98b | 2010-02-23 10:34:29 +0000 | [diff] [blame] | 5501 | return static_cast<uint32_t>((addr_hash ^ name->Hash()) & kCapacityMask); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 5502 | } |
| 5503 | |
| 5504 | |
| 5505 | int KeyedLookupCache::Lookup(Map* map, String* name) { |
| 5506 | int index = Hash(map, name); |
| 5507 | Key& key = keys_[index]; |
| 5508 | if ((key.map == map) && key.name->Equals(name)) { |
| 5509 | return field_offsets_[index]; |
| 5510 | } |
| 5511 | return -1; |
| 5512 | } |
| 5513 | |
| 5514 | |
| 5515 | void KeyedLookupCache::Update(Map* map, String* name, int field_offset) { |
| 5516 | String* symbol; |
| 5517 | if (Heap::LookupSymbolIfExists(name, &symbol)) { |
| 5518 | int index = Hash(map, symbol); |
| 5519 | Key& key = keys_[index]; |
| 5520 | key.map = map; |
| 5521 | key.name = symbol; |
| 5522 | field_offsets_[index] = field_offset; |
| 5523 | } |
| 5524 | } |
| 5525 | |
| 5526 | |
| 5527 | void KeyedLookupCache::Clear() { |
| 5528 | for (int index = 0; index < kLength; index++) keys_[index].map = NULL; |
| 5529 | } |
| 5530 | |
| 5531 | |
| 5532 | KeyedLookupCache::Key KeyedLookupCache::keys_[KeyedLookupCache::kLength]; |
| 5533 | |
| 5534 | |
| 5535 | int KeyedLookupCache::field_offsets_[KeyedLookupCache::kLength]; |
| 5536 | |
| 5537 | |
| 5538 | void DescriptorLookupCache::Clear() { |
| 5539 | for (int index = 0; index < kLength; index++) keys_[index].array = NULL; |
| 5540 | } |
| 5541 | |
| 5542 | |
| 5543 | DescriptorLookupCache::Key |
| 5544 | DescriptorLookupCache::keys_[DescriptorLookupCache::kLength]; |
| 5545 | |
| 5546 | int DescriptorLookupCache::results_[DescriptorLookupCache::kLength]; |
| 5547 | |
| 5548 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 5549 | #ifdef DEBUG |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 5550 | void Heap::GarbageCollectionGreedyCheck() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 5551 | ASSERT(FLAG_gc_greedy); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 5552 | if (Bootstrapper::IsActive()) return; |
| 5553 | if (disallow_allocation_failure()) return; |
| 5554 | CollectGarbage(NEW_SPACE); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 5555 | } |
| 5556 | #endif |
| 5557 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 5558 | |
| 5559 | TranscendentalCache::TranscendentalCache(TranscendentalCache::Type t) |
| 5560 | : type_(t) { |
| 5561 | uint32_t in0 = 0xffffffffu; // Bit-pattern for a NaN that isn't |
| 5562 | uint32_t in1 = 0xffffffffu; // generated by the FPU. |
| 5563 | for (int i = 0; i < kCacheSize; i++) { |
| 5564 | elements_[i].in[0] = in0; |
| 5565 | elements_[i].in[1] = in1; |
| 5566 | elements_[i].output = NULL; |
| 5567 | } |
| 5568 | } |
| 5569 | |
| 5570 | |
| 5571 | TranscendentalCache* TranscendentalCache::caches_[kNumberOfCaches]; |
| 5572 | |
| 5573 | |
| 5574 | void TranscendentalCache::Clear() { |
| 5575 | for (int i = 0; i < kNumberOfCaches; i++) { |
| 5576 | if (caches_[i] != NULL) { |
| 5577 | delete caches_[i]; |
| 5578 | caches_[i] = NULL; |
| 5579 | } |
| 5580 | } |
| 5581 | } |
| 5582 | |
| 5583 | |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 5584 | void ExternalStringTable::CleanUp() { |
| 5585 | int last = 0; |
| 5586 | for (int i = 0; i < new_space_strings_.length(); ++i) { |
| 5587 | if (new_space_strings_[i] == Heap::raw_unchecked_null_value()) continue; |
| 5588 | if (Heap::InNewSpace(new_space_strings_[i])) { |
| 5589 | new_space_strings_[last++] = new_space_strings_[i]; |
| 5590 | } else { |
| 5591 | old_space_strings_.Add(new_space_strings_[i]); |
| 5592 | } |
| 5593 | } |
| 5594 | new_space_strings_.Rewind(last); |
| 5595 | last = 0; |
| 5596 | for (int i = 0; i < old_space_strings_.length(); ++i) { |
| 5597 | if (old_space_strings_[i] == Heap::raw_unchecked_null_value()) continue; |
| 5598 | ASSERT(!Heap::InNewSpace(old_space_strings_[i])); |
| 5599 | old_space_strings_[last++] = old_space_strings_[i]; |
| 5600 | } |
| 5601 | old_space_strings_.Rewind(last); |
| 5602 | Verify(); |
| 5603 | } |
| 5604 | |
| 5605 | |
| 5606 | void ExternalStringTable::TearDown() { |
| 5607 | new_space_strings_.Free(); |
| 5608 | old_space_strings_.Free(); |
| 5609 | } |
| 5610 | |
| 5611 | |
| 5612 | List<Object*> ExternalStringTable::new_space_strings_; |
| 5613 | List<Object*> ExternalStringTable::old_space_strings_; |
| 5614 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 5615 | } } // namespace v8::internal |