vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 30 | #include "compilation-cache.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 31 | #include "execution.h" |
ricow@chromium.org | 4980dff | 2010-07-19 08:33:45 +0000 | [diff] [blame] | 32 | #include "heap-profiler.h" |
erik.corry@gmail.com | 0511e24 | 2011-01-19 11:11:08 +0000 | [diff] [blame] | 33 | #include "gdb-jit.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 34 | #include "global-handles.h" |
| 35 | #include "ic-inl.h" |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 36 | #include "liveobjectlist-inl.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 37 | #include "mark-compact.h" |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 38 | #include "objects-visiting.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 39 | #include "stub-cache.h" |
| 40 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 41 | namespace v8 { |
| 42 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 43 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 44 | // ------------------------------------------------------------------------- |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 45 | // MarkCompactCollector |
| 46 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 47 | MarkCompactCollector::MarkCompactCollector() : // NOLINT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 48 | #ifdef DEBUG |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 49 | state_(IDLE), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 50 | #endif |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 51 | force_compaction_(false), |
| 52 | compacting_collection_(false), |
| 53 | compact_on_next_gc_(false), |
| 54 | previous_marked_count_(0), |
| 55 | tracer_(NULL), |
| 56 | #ifdef DEBUG |
| 57 | live_young_objects_size_(0), |
| 58 | live_old_pointer_objects_size_(0), |
| 59 | live_old_data_objects_size_(0), |
| 60 | live_code_objects_size_(0), |
| 61 | live_map_objects_size_(0), |
| 62 | live_cell_objects_size_(0), |
| 63 | live_lo_objects_size_(0), |
| 64 | live_bytes_(0), |
| 65 | #endif |
| 66 | heap_(NULL), |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 67 | code_flusher_(NULL), |
| 68 | encountered_weak_maps_(NULL) { } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 69 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 70 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 71 | void MarkCompactCollector::CollectGarbage() { |
| 72 | // Make sure that Prepare() has been called. The individual steps below will |
| 73 | // update the state as they proceed. |
| 74 | ASSERT(state_ == PREPARE_GC); |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 75 | ASSERT(encountered_weak_maps_ == Smi::FromInt(0)); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 76 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 77 | // Prepare has selected whether to compact the old generation or not. |
| 78 | // Tell the tracer. |
| 79 | if (IsCompacting()) tracer_->set_is_compacting(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 80 | |
| 81 | MarkLiveObjects(); |
| 82 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 83 | if (FLAG_collect_maps) ClearNonLiveTransitions(); |
| 84 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 85 | ClearWeakMaps(); |
| 86 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 87 | SweepLargeObjectSpace(); |
| 88 | |
ager@chromium.org | 96c75b5 | 2009-08-26 09:13:16 +0000 | [diff] [blame] | 89 | if (IsCompacting()) { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 90 | GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_COMPACT); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 91 | EncodeForwardingAddresses(); |
| 92 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 93 | heap()->MarkMapPointersAsEncoded(true); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 94 | UpdatePointers(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 95 | heap()->MarkMapPointersAsEncoded(false); |
| 96 | heap()->isolate()->pc_to_code_cache()->Flush(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 97 | |
| 98 | RelocateObjects(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 99 | } else { |
| 100 | SweepSpaces(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 101 | heap()->isolate()->pc_to_code_cache()->Flush(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | Finish(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 105 | |
| 106 | // Save the count of marked objects remaining after the collection and |
| 107 | // null out the GC tracer. |
| 108 | previous_marked_count_ = tracer_->marked_count(); |
| 109 | ASSERT(previous_marked_count_ == 0); |
| 110 | tracer_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 114 | void MarkCompactCollector::Prepare(GCTracer* tracer) { |
| 115 | // Rather than passing the tracer around we stash it in a static member |
| 116 | // variable. |
| 117 | tracer_ = tracer; |
| 118 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 119 | #ifdef DEBUG |
| 120 | ASSERT(state_ == IDLE); |
| 121 | state_ = PREPARE_GC; |
| 122 | #endif |
| 123 | ASSERT(!FLAG_always_compact || !FLAG_never_compact); |
| 124 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 125 | compacting_collection_ = |
| 126 | FLAG_always_compact || force_compaction_ || compact_on_next_gc_; |
| 127 | compact_on_next_gc_ = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 128 | |
| 129 | if (FLAG_never_compact) compacting_collection_ = false; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 130 | if (!heap()->map_space()->MapPointersEncodable()) |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 131 | compacting_collection_ = false; |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 132 | if (FLAG_collect_maps) CreateBackPointers(); |
erik.corry@gmail.com | 0511e24 | 2011-01-19 11:11:08 +0000 | [diff] [blame] | 133 | #ifdef ENABLE_GDB_JIT_INTERFACE |
| 134 | if (FLAG_gdbjit) { |
| 135 | // If GDBJIT interface is active disable compaction. |
| 136 | compacting_collection_ = false; |
| 137 | } |
| 138 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 139 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 140 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 141 | for (PagedSpace* space = spaces.next(); |
| 142 | space != NULL; space = spaces.next()) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 143 | space->PrepareForMarkCompact(compacting_collection_); |
| 144 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 145 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 146 | #ifdef DEBUG |
| 147 | live_bytes_ = 0; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 148 | live_young_objects_size_ = 0; |
| 149 | live_old_pointer_objects_size_ = 0; |
| 150 | live_old_data_objects_size_ = 0; |
| 151 | live_code_objects_size_ = 0; |
| 152 | live_map_objects_size_ = 0; |
| 153 | live_cell_objects_size_ = 0; |
| 154 | live_lo_objects_size_ = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 155 | #endif |
| 156 | } |
| 157 | |
| 158 | |
| 159 | void MarkCompactCollector::Finish() { |
| 160 | #ifdef DEBUG |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 161 | ASSERT(state_ == SWEEP_SPACES || state_ == RELOCATE_OBJECTS); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 162 | state_ = IDLE; |
| 163 | #endif |
| 164 | // The stub cache is not traversed during GC; clear the cache to |
| 165 | // force lazy re-initialization of it. This must be done after the |
| 166 | // GC, because it relies on the new address of certain old space |
| 167 | // objects (empty string, illegal builtin). |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 168 | heap()->isolate()->stub_cache()->Clear(); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 169 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 170 | heap()->external_string_table_.CleanUp(); |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 171 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 172 | // If we've just compacted old space there's no reason to check the |
| 173 | // fragmentation limit. Just return. |
| 174 | if (HasCompacted()) return; |
| 175 | |
| 176 | // We compact the old generation on the next GC if it has gotten too |
| 177 | // fragmented (ie, we could recover an expected amount of space by |
| 178 | // reclaiming the waste and free list blocks). |
| 179 | static const int kFragmentationLimit = 15; // Percent. |
| 180 | static const int kFragmentationAllowed = 1 * MB; // Absolute. |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 181 | intptr_t old_gen_recoverable = 0; |
| 182 | intptr_t old_gen_used = 0; |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 183 | |
| 184 | OldSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 185 | for (OldSpace* space = spaces.next(); space != NULL; space = spaces.next()) { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 186 | old_gen_recoverable += space->Waste() + space->AvailableFree(); |
| 187 | old_gen_used += space->Size(); |
| 188 | } |
| 189 | |
| 190 | int old_gen_fragmentation = |
| 191 | static_cast<int>((old_gen_recoverable * 100.0) / old_gen_used); |
| 192 | if (old_gen_fragmentation > kFragmentationLimit && |
| 193 | old_gen_recoverable > kFragmentationAllowed) { |
| 194 | compact_on_next_gc_ = true; |
| 195 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 199 | // ------------------------------------------------------------------------- |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 200 | // Phase 1: tracing and marking live objects. |
| 201 | // before: all objects are in normal state. |
| 202 | // after: a live object's map pointer is marked as '00'. |
| 203 | |
| 204 | // Marking all live objects in the heap as part of mark-sweep or mark-compact |
| 205 | // collection. Before marking, all objects are in their normal state. After |
| 206 | // marking, live objects' map pointers are marked indicating that the object |
| 207 | // has been found reachable. |
| 208 | // |
| 209 | // The marking algorithm is a (mostly) depth-first (because of possible stack |
| 210 | // overflow) traversal of the graph of objects reachable from the roots. It |
| 211 | // uses an explicit stack of pointers rather than recursion. The young |
| 212 | // generation's inactive ('from') space is used as a marking stack. The |
| 213 | // objects in the marking stack are the ones that have been reached and marked |
| 214 | // but their children have not yet been visited. |
| 215 | // |
| 216 | // The marking stack can overflow during traversal. In that case, we set an |
| 217 | // overflow flag. When the overflow flag is set, we continue marking objects |
| 218 | // reachable from the objects on the marking stack, but no longer push them on |
| 219 | // the marking stack. Instead, we mark them as both marked and overflowed. |
| 220 | // When the stack is in the overflowed state, objects marked as overflowed |
| 221 | // have been reached and marked but their children have not been visited yet. |
| 222 | // After emptying the marking stack, we clear the overflow flag and traverse |
| 223 | // the heap looking for objects marked as overflowed, push them on the stack, |
| 224 | // and continue with marking. This process repeats until all reachable |
| 225 | // objects have been marked. |
| 226 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 227 | class CodeFlusher { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 228 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 229 | explicit CodeFlusher(Isolate* isolate) |
| 230 | : isolate_(isolate), |
| 231 | jsfunction_candidates_head_(NULL), |
| 232 | shared_function_info_candidates_head_(NULL) {} |
| 233 | |
| 234 | void AddCandidate(SharedFunctionInfo* shared_info) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 235 | SetNextCandidate(shared_info, shared_function_info_candidates_head_); |
| 236 | shared_function_info_candidates_head_ = shared_info; |
| 237 | } |
| 238 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 239 | void AddCandidate(JSFunction* function) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 240 | ASSERT(function->unchecked_code() == |
| 241 | function->unchecked_shared()->unchecked_code()); |
| 242 | |
| 243 | SetNextCandidate(function, jsfunction_candidates_head_); |
| 244 | jsfunction_candidates_head_ = function; |
| 245 | } |
| 246 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 247 | void ProcessCandidates() { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 248 | ProcessSharedFunctionInfoCandidates(); |
| 249 | ProcessJSFunctionCandidates(); |
| 250 | } |
| 251 | |
| 252 | private: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 253 | void ProcessJSFunctionCandidates() { |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 254 | Code* lazy_compile = isolate_->builtins()->builtin(Builtins::kLazyCompile); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 255 | |
| 256 | JSFunction* candidate = jsfunction_candidates_head_; |
| 257 | JSFunction* next_candidate; |
| 258 | while (candidate != NULL) { |
| 259 | next_candidate = GetNextCandidate(candidate); |
| 260 | |
| 261 | SharedFunctionInfo* shared = candidate->unchecked_shared(); |
| 262 | |
| 263 | Code* code = shared->unchecked_code(); |
| 264 | if (!code->IsMarked()) { |
| 265 | shared->set_code(lazy_compile); |
| 266 | candidate->set_code(lazy_compile); |
| 267 | } else { |
| 268 | candidate->set_code(shared->unchecked_code()); |
| 269 | } |
| 270 | |
| 271 | candidate = next_candidate; |
| 272 | } |
| 273 | |
| 274 | jsfunction_candidates_head_ = NULL; |
| 275 | } |
| 276 | |
| 277 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 278 | void ProcessSharedFunctionInfoCandidates() { |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 279 | Code* lazy_compile = isolate_->builtins()->builtin(Builtins::kLazyCompile); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 280 | |
| 281 | SharedFunctionInfo* candidate = shared_function_info_candidates_head_; |
| 282 | SharedFunctionInfo* next_candidate; |
| 283 | while (candidate != NULL) { |
| 284 | next_candidate = GetNextCandidate(candidate); |
| 285 | SetNextCandidate(candidate, NULL); |
| 286 | |
| 287 | Code* code = candidate->unchecked_code(); |
| 288 | if (!code->IsMarked()) { |
| 289 | candidate->set_code(lazy_compile); |
| 290 | } |
| 291 | |
| 292 | candidate = next_candidate; |
| 293 | } |
| 294 | |
| 295 | shared_function_info_candidates_head_ = NULL; |
| 296 | } |
| 297 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 298 | static JSFunction** GetNextCandidateField(JSFunction* candidate) { |
| 299 | return reinterpret_cast<JSFunction**>( |
| 300 | candidate->address() + JSFunction::kCodeEntryOffset); |
| 301 | } |
| 302 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 303 | static JSFunction* GetNextCandidate(JSFunction* candidate) { |
| 304 | return *GetNextCandidateField(candidate); |
| 305 | } |
| 306 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 307 | static void SetNextCandidate(JSFunction* candidate, |
| 308 | JSFunction* next_candidate) { |
| 309 | *GetNextCandidateField(candidate) = next_candidate; |
| 310 | } |
| 311 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 312 | static SharedFunctionInfo** GetNextCandidateField( |
| 313 | SharedFunctionInfo* candidate) { |
| 314 | Code* code = candidate->unchecked_code(); |
| 315 | return reinterpret_cast<SharedFunctionInfo**>( |
vegorov@chromium.org | 7304bca | 2011-05-16 12:14:13 +0000 | [diff] [blame] | 316 | code->address() + Code::kNextCodeFlushingCandidateOffset); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 317 | } |
| 318 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 319 | static SharedFunctionInfo* GetNextCandidate(SharedFunctionInfo* candidate) { |
| 320 | return *GetNextCandidateField(candidate); |
| 321 | } |
| 322 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 323 | static void SetNextCandidate(SharedFunctionInfo* candidate, |
| 324 | SharedFunctionInfo* next_candidate) { |
| 325 | *GetNextCandidateField(candidate) = next_candidate; |
| 326 | } |
| 327 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 328 | Isolate* isolate_; |
| 329 | JSFunction* jsfunction_candidates_head_; |
| 330 | SharedFunctionInfo* shared_function_info_candidates_head_; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 331 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 332 | DISALLOW_COPY_AND_ASSIGN(CodeFlusher); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 333 | }; |
| 334 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 335 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 336 | MarkCompactCollector::~MarkCompactCollector() { |
| 337 | if (code_flusher_ != NULL) { |
| 338 | delete code_flusher_; |
| 339 | code_flusher_ = NULL; |
| 340 | } |
| 341 | } |
| 342 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 343 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 344 | static inline HeapObject* ShortCircuitConsString(Object** p) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 345 | // Optimization: If the heap object pointed to by p is a non-symbol |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 346 | // cons string whose right substring is HEAP->empty_string, update |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 347 | // it in place to its left substring. Return the updated value. |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 348 | // |
| 349 | // Here we assume that if we change *p, we replace it with a heap object |
| 350 | // (ie, the left substring of a cons string is always a heap object). |
| 351 | // |
| 352 | // The check performed is: |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 353 | // object->IsConsString() && !object->IsSymbol() && |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 354 | // (ConsString::cast(object)->second() == HEAP->empty_string()) |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 355 | // except the maps for the object and its possible substrings might be |
| 356 | // marked. |
| 357 | HeapObject* object = HeapObject::cast(*p); |
| 358 | MapWord map_word = object->map_word(); |
| 359 | map_word.ClearMark(); |
| 360 | InstanceType type = map_word.ToMap()->instance_type(); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 361 | if ((type & kShortcutTypeMask) != kShortcutTypeTag) return object; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 362 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 363 | Object* second = reinterpret_cast<ConsString*>(object)->unchecked_second(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 364 | Heap* heap = map_word.ToMap()->heap(); |
| 365 | if (second != heap->raw_unchecked_empty_string()) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 366 | return object; |
| 367 | } |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 368 | |
| 369 | // Since we don't have the object's start, it is impossible to update the |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 370 | // page dirty marks. Therefore, we only replace the string with its left |
| 371 | // substring when page dirty marks do not change. |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 372 | Object* first = reinterpret_cast<ConsString*>(object)->unchecked_first(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 373 | if (!heap->InNewSpace(object) && heap->InNewSpace(first)) return object; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 374 | |
| 375 | *p = first; |
| 376 | return HeapObject::cast(first); |
| 377 | } |
| 378 | |
| 379 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 380 | class StaticMarkingVisitor : public StaticVisitorBase { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 381 | public: |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 382 | static inline void IterateBody(Map* map, HeapObject* obj) { |
| 383 | table_.GetVisitor(map)(map, obj); |
| 384 | } |
| 385 | |
| 386 | static void Initialize() { |
| 387 | table_.Register(kVisitShortcutCandidate, |
| 388 | &FixedBodyVisitor<StaticMarkingVisitor, |
| 389 | ConsString::BodyDescriptor, |
| 390 | void>::Visit); |
| 391 | |
| 392 | table_.Register(kVisitConsString, |
| 393 | &FixedBodyVisitor<StaticMarkingVisitor, |
| 394 | ConsString::BodyDescriptor, |
| 395 | void>::Visit); |
| 396 | |
| 397 | |
| 398 | table_.Register(kVisitFixedArray, |
| 399 | &FlexibleBodyVisitor<StaticMarkingVisitor, |
| 400 | FixedArray::BodyDescriptor, |
| 401 | void>::Visit); |
| 402 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 403 | table_.Register(kVisitFixedDoubleArray, DataObjectVisitor::Visit); |
| 404 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 405 | table_.Register(kVisitGlobalContext, |
| 406 | &FixedBodyVisitor<StaticMarkingVisitor, |
| 407 | Context::MarkCompactBodyDescriptor, |
| 408 | void>::Visit); |
| 409 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 410 | table_.Register(kVisitByteArray, &DataObjectVisitor::Visit); |
| 411 | table_.Register(kVisitSeqAsciiString, &DataObjectVisitor::Visit); |
| 412 | table_.Register(kVisitSeqTwoByteString, &DataObjectVisitor::Visit); |
| 413 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 414 | table_.Register(kVisitJSWeakMap, &VisitJSWeakMap); |
| 415 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 416 | table_.Register(kVisitOddball, |
| 417 | &FixedBodyVisitor<StaticMarkingVisitor, |
| 418 | Oddball::BodyDescriptor, |
| 419 | void>::Visit); |
| 420 | table_.Register(kVisitMap, |
| 421 | &FixedBodyVisitor<StaticMarkingVisitor, |
| 422 | Map::BodyDescriptor, |
| 423 | void>::Visit); |
| 424 | |
| 425 | table_.Register(kVisitCode, &VisitCode); |
| 426 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 427 | table_.Register(kVisitSharedFunctionInfo, |
| 428 | &VisitSharedFunctionInfoAndFlushCode); |
| 429 | |
| 430 | table_.Register(kVisitJSFunction, |
| 431 | &VisitJSFunctionAndFlushCode); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 432 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 433 | table_.Register(kVisitJSRegExp, |
| 434 | &VisitRegExpAndFlushCode); |
| 435 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 436 | table_.Register(kVisitPropertyCell, |
| 437 | &FixedBodyVisitor<StaticMarkingVisitor, |
| 438 | JSGlobalPropertyCell::BodyDescriptor, |
| 439 | void>::Visit); |
| 440 | |
| 441 | table_.RegisterSpecializations<DataObjectVisitor, |
| 442 | kVisitDataObject, |
| 443 | kVisitDataObjectGeneric>(); |
| 444 | |
| 445 | table_.RegisterSpecializations<JSObjectVisitor, |
| 446 | kVisitJSObject, |
| 447 | kVisitJSObjectGeneric>(); |
| 448 | |
| 449 | table_.RegisterSpecializations<StructObjectVisitor, |
| 450 | kVisitStruct, |
| 451 | kVisitStructGeneric>(); |
| 452 | } |
| 453 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 454 | INLINE(static void VisitPointer(Heap* heap, Object** p)) { |
| 455 | MarkObjectByPointer(heap, p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 456 | } |
| 457 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 458 | INLINE(static void VisitPointers(Heap* heap, Object** start, Object** end)) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 459 | // Mark all objects pointed to in [start, end). |
| 460 | const int kMinRangeForMarkingRecursion = 64; |
| 461 | if (end - start >= kMinRangeForMarkingRecursion) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 462 | if (VisitUnmarkedObjects(heap, start, end)) return; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 463 | // We are close to a stack overflow, so just mark the objects. |
| 464 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 465 | for (Object** p = start; p < end; p++) MarkObjectByPointer(heap, p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 466 | } |
| 467 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 468 | static inline void VisitCodeTarget(Heap* heap, RelocInfo* rinfo) { |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 469 | ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode())); |
ager@chromium.org | 4af710e | 2009-09-15 12:20:11 +0000 | [diff] [blame] | 470 | Code* code = Code::GetCodeFromTargetAddress(rinfo->target_address()); |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 471 | if (FLAG_cleanup_code_caches_at_gc && code->is_inline_cache_stub()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 472 | IC::Clear(rinfo->pc()); |
| 473 | // Please note targets for cleared inline cached do not have to be |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 474 | // marked since they are contained in HEAP->non_monomorphic_cache(). |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 475 | } else { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 476 | heap->mark_compact_collector()->MarkObject(code); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 477 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 478 | } |
| 479 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 480 | static void VisitGlobalPropertyCell(Heap* heap, RelocInfo* rinfo) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 481 | ASSERT(rinfo->rmode() == RelocInfo::GLOBAL_PROPERTY_CELL); |
| 482 | Object* cell = rinfo->target_cell(); |
| 483 | Object* old_cell = cell; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 484 | VisitPointer(heap, &cell); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 485 | if (cell != old_cell) { |
| 486 | rinfo->set_target_cell(reinterpret_cast<JSGlobalPropertyCell*>(cell)); |
| 487 | } |
| 488 | } |
| 489 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 490 | static inline void VisitDebugTarget(Heap* heap, RelocInfo* rinfo) { |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 491 | ASSERT((RelocInfo::IsJSReturn(rinfo->rmode()) && |
| 492 | rinfo->IsPatchedReturnSequence()) || |
| 493 | (RelocInfo::IsDebugBreakSlot(rinfo->rmode()) && |
| 494 | rinfo->IsPatchedDebugBreakSlotSequence())); |
ager@chromium.org | 4af710e | 2009-09-15 12:20:11 +0000 | [diff] [blame] | 495 | HeapObject* code = Code::GetCodeFromTargetAddress(rinfo->call_address()); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 496 | heap->mark_compact_collector()->MarkObject(code); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 497 | } |
| 498 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 499 | // Mark object pointed to by p. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 500 | INLINE(static void MarkObjectByPointer(Heap* heap, Object** p)) { |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 501 | if (!(*p)->IsHeapObject()) return; |
| 502 | HeapObject* object = ShortCircuitConsString(p); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 503 | if (!object->IsMarked()) { |
| 504 | heap->mark_compact_collector()->MarkUnmarkedObject(object); |
| 505 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 506 | } |
| 507 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 508 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 509 | // Visit an unmarked object. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 510 | INLINE(static void VisitUnmarkedObject(MarkCompactCollector* collector, |
| 511 | HeapObject* obj)) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 512 | #ifdef DEBUG |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 513 | ASSERT(Isolate::Current()->heap()->Contains(obj)); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 514 | ASSERT(!obj->IsMarked()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 515 | #endif |
| 516 | Map* map = obj->map(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 517 | collector->SetMark(obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 518 | // Mark the map pointer and the body. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 519 | if (!map->IsMarked()) collector->MarkUnmarkedObject(map); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 520 | IterateBody(map, obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | // Visit all unmarked objects pointed to by [start, end). |
| 524 | // Returns false if the operation fails (lack of stack space). |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 525 | static inline bool VisitUnmarkedObjects(Heap* heap, |
| 526 | Object** start, |
| 527 | Object** end) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 528 | // Return false is we are close to the stack limit. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 529 | StackLimitCheck check(heap->isolate()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 530 | if (check.HasOverflowed()) return false; |
| 531 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 532 | MarkCompactCollector* collector = heap->mark_compact_collector(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 533 | // Visit the unmarked objects. |
| 534 | for (Object** p = start; p < end; p++) { |
| 535 | if (!(*p)->IsHeapObject()) continue; |
| 536 | HeapObject* obj = HeapObject::cast(*p); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 537 | if (obj->IsMarked()) continue; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 538 | VisitUnmarkedObject(collector, obj); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 539 | } |
| 540 | return true; |
| 541 | } |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 542 | |
| 543 | static inline void VisitExternalReference(Address* p) { } |
| 544 | static inline void VisitRuntimeEntry(RelocInfo* rinfo) { } |
| 545 | |
| 546 | private: |
| 547 | class DataObjectVisitor { |
| 548 | public: |
| 549 | template<int size> |
| 550 | static void VisitSpecialized(Map* map, HeapObject* object) { |
| 551 | } |
| 552 | |
| 553 | static void Visit(Map* map, HeapObject* object) { |
| 554 | } |
| 555 | }; |
| 556 | |
| 557 | typedef FlexibleBodyVisitor<StaticMarkingVisitor, |
| 558 | JSObject::BodyDescriptor, |
| 559 | void> JSObjectVisitor; |
| 560 | |
| 561 | typedef FlexibleBodyVisitor<StaticMarkingVisitor, |
| 562 | StructBodyDescriptor, |
| 563 | void> StructObjectVisitor; |
| 564 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 565 | static void VisitJSWeakMap(Map* map, HeapObject* object) { |
| 566 | MarkCompactCollector* collector = map->heap()->mark_compact_collector(); |
| 567 | JSWeakMap* weak_map = reinterpret_cast<JSWeakMap*>(object); |
| 568 | |
| 569 | // Enqueue weak map in linked list of encountered weak maps. |
| 570 | ASSERT(weak_map->next() == Smi::FromInt(0)); |
| 571 | weak_map->set_next(collector->encountered_weak_maps()); |
| 572 | collector->set_encountered_weak_maps(weak_map); |
| 573 | |
| 574 | // Skip visiting the backing hash table containing the mappings. |
| 575 | int object_size = JSWeakMap::BodyDescriptor::SizeOf(map, object); |
| 576 | BodyVisitorBase<StaticMarkingVisitor>::IteratePointers( |
| 577 | map->heap(), |
| 578 | object, |
| 579 | JSWeakMap::BodyDescriptor::kStartOffset, |
| 580 | JSWeakMap::kTableOffset); |
| 581 | BodyVisitorBase<StaticMarkingVisitor>::IteratePointers( |
| 582 | map->heap(), |
| 583 | object, |
| 584 | JSWeakMap::kTableOffset + kPointerSize, |
| 585 | object_size); |
| 586 | |
| 587 | // Mark the backing hash table without pushing it on the marking stack. |
| 588 | ASSERT(!weak_map->unchecked_table()->IsMarked()); |
| 589 | ASSERT(weak_map->unchecked_table()->map()->IsMarked()); |
| 590 | collector->SetMark(weak_map->unchecked_table()); |
| 591 | } |
| 592 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 593 | static void VisitCode(Map* map, HeapObject* object) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 594 | reinterpret_cast<Code*>(object)->CodeIterateBody<StaticMarkingVisitor>( |
| 595 | map->heap()); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 596 | } |
| 597 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 598 | // Code flushing support. |
| 599 | |
| 600 | // How many collections newly compiled code object will survive before being |
| 601 | // flushed. |
| 602 | static const int kCodeAgeThreshold = 5; |
| 603 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 604 | static const int kRegExpCodeThreshold = 5; |
| 605 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 606 | inline static bool HasSourceCode(Heap* heap, SharedFunctionInfo* info) { |
| 607 | Object* undefined = heap->raw_unchecked_undefined_value(); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 608 | return (info->script() != undefined) && |
| 609 | (reinterpret_cast<Script*>(info->script())->source() != undefined); |
| 610 | } |
| 611 | |
| 612 | |
| 613 | inline static bool IsCompiled(JSFunction* function) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 614 | return function->unchecked_code() != |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 615 | function->GetIsolate()->builtins()->builtin(Builtins::kLazyCompile); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 616 | } |
| 617 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 618 | inline static bool IsCompiled(SharedFunctionInfo* function) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 619 | return function->unchecked_code() != |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 620 | function->GetIsolate()->builtins()->builtin(Builtins::kLazyCompile); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 621 | } |
| 622 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 623 | inline static bool IsFlushable(Heap* heap, JSFunction* function) { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 624 | SharedFunctionInfo* shared_info = function->unchecked_shared(); |
| 625 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 626 | // Code is either on stack, in compilation cache or referenced |
| 627 | // by optimized version of function. |
| 628 | if (function->unchecked_code()->IsMarked()) { |
| 629 | shared_info->set_code_age(0); |
| 630 | return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 631 | } |
| 632 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 633 | // We do not flush code for optimized functions. |
| 634 | if (function->code() != shared_info->unchecked_code()) { |
| 635 | return false; |
| 636 | } |
| 637 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 638 | return IsFlushable(heap, shared_info); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 639 | } |
| 640 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 641 | inline static bool IsFlushable(Heap* heap, SharedFunctionInfo* shared_info) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 642 | // Code is either on stack, in compilation cache or referenced |
| 643 | // by optimized version of function. |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 644 | if (shared_info->unchecked_code()->IsMarked()) { |
| 645 | shared_info->set_code_age(0); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 646 | return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | // The function must be compiled and have the source code available, |
| 650 | // to be able to recompile it in case we need the function again. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 651 | if (!(shared_info->is_compiled() && HasSourceCode(heap, shared_info))) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 652 | return false; |
| 653 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 654 | |
| 655 | // We never flush code for Api functions. |
| 656 | Object* function_data = shared_info->function_data(); |
| 657 | if (function_data->IsHeapObject() && |
| 658 | (SafeMap(function_data)->instance_type() == |
| 659 | FUNCTION_TEMPLATE_INFO_TYPE)) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 660 | return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | // Only flush code for functions. |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 664 | if (shared_info->code()->kind() != Code::FUNCTION) return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 665 | |
| 666 | // Function must be lazy compilable. |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 667 | if (!shared_info->allows_lazy_compilation()) return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 668 | |
| 669 | // If this is a full script wrapped in a function we do no flush the code. |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 670 | if (shared_info->is_toplevel()) return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 671 | |
| 672 | // Age this shared function info. |
| 673 | if (shared_info->code_age() < kCodeAgeThreshold) { |
| 674 | shared_info->set_code_age(shared_info->code_age() + 1); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 675 | return false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 676 | } |
| 677 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 678 | return true; |
| 679 | } |
| 680 | |
| 681 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 682 | static bool FlushCodeForFunction(Heap* heap, JSFunction* function) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 683 | if (!IsFlushable(heap, function)) return false; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 684 | |
| 685 | // This function's code looks flushable. But we have to postpone the |
| 686 | // decision until we see all functions that point to the same |
| 687 | // SharedFunctionInfo because some of them might be optimized. |
| 688 | // That would make the nonoptimized version of the code nonflushable, |
| 689 | // because it is required for bailing out from optimized code. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 690 | heap->mark_compact_collector()->code_flusher()->AddCandidate(function); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 691 | return true; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | |
| 695 | static inline Map* SafeMap(Object* obj) { |
| 696 | MapWord map_word = HeapObject::cast(obj)->map_word(); |
| 697 | map_word.ClearMark(); |
| 698 | map_word.ClearOverflow(); |
| 699 | return map_word.ToMap(); |
| 700 | } |
| 701 | |
| 702 | |
| 703 | static inline bool IsJSBuiltinsObject(Object* obj) { |
| 704 | return obj->IsHeapObject() && |
| 705 | (SafeMap(obj)->instance_type() == JS_BUILTINS_OBJECT_TYPE); |
| 706 | } |
| 707 | |
| 708 | |
| 709 | static inline bool IsValidNotBuiltinContext(Object* ctx) { |
| 710 | if (!ctx->IsHeapObject()) return false; |
| 711 | |
| 712 | Map* map = SafeMap(ctx); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 713 | Heap* heap = map->heap(); |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 714 | if (!(map == heap->raw_unchecked_function_context_map() || |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 715 | map == heap->raw_unchecked_catch_context_map() || |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 716 | map == heap->raw_unchecked_with_context_map() || |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 717 | map == heap->raw_unchecked_global_context_map())) { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 718 | return false; |
| 719 | } |
| 720 | |
| 721 | Context* context = reinterpret_cast<Context*>(ctx); |
| 722 | |
| 723 | if (IsJSBuiltinsObject(context->global())) { |
| 724 | return false; |
| 725 | } |
| 726 | |
| 727 | return true; |
| 728 | } |
| 729 | |
| 730 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 731 | static void VisitSharedFunctionInfoGeneric(Map* map, HeapObject* object) { |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 732 | SharedFunctionInfo* shared = reinterpret_cast<SharedFunctionInfo*>(object); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 733 | |
| 734 | if (shared->IsInobjectSlackTrackingInProgress()) shared->DetachInitialMap(); |
| 735 | |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 736 | FixedBodyVisitor<StaticMarkingVisitor, |
| 737 | SharedFunctionInfo::BodyDescriptor, |
| 738 | void>::Visit(map, object); |
| 739 | } |
| 740 | |
| 741 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 742 | static void UpdateRegExpCodeAgeAndFlush(Heap* heap, |
| 743 | JSRegExp* re, |
| 744 | bool is_ascii) { |
| 745 | // Make sure that the fixed array is in fact initialized on the RegExp. |
| 746 | // We could potentially trigger a GC when initializing the RegExp. |
| 747 | if (SafeMap(re->data())->instance_type() != FIXED_ARRAY_TYPE) return; |
| 748 | |
| 749 | // Make sure this is a RegExp that actually contains code. |
| 750 | if (re->TypeTagUnchecked() != JSRegExp::IRREGEXP) return; |
| 751 | |
| 752 | Object* code = re->DataAtUnchecked(JSRegExp::code_index(is_ascii)); |
| 753 | if (!code->IsSmi() && SafeMap(code)->instance_type() == CODE_TYPE) { |
| 754 | // Save a copy that can be reinstated if we need the code again. |
| 755 | re->SetDataAtUnchecked(JSRegExp::saved_code_index(is_ascii), |
| 756 | code, |
| 757 | heap); |
| 758 | // Set a number in the 0-255 range to guarantee no smi overflow. |
| 759 | re->SetDataAtUnchecked(JSRegExp::code_index(is_ascii), |
| 760 | Smi::FromInt(heap->sweep_generation() & 0xff), |
| 761 | heap); |
| 762 | } else if (code->IsSmi()) { |
| 763 | int value = Smi::cast(code)->value(); |
| 764 | // The regexp has not been compiled yet or there was a compilation error. |
| 765 | if (value == JSRegExp::kUninitializedValue || |
| 766 | value == JSRegExp::kCompilationErrorValue) { |
| 767 | return; |
| 768 | } |
| 769 | |
| 770 | // Check if we should flush now. |
| 771 | if (value == ((heap->sweep_generation() - kRegExpCodeThreshold) & 0xff)) { |
| 772 | re->SetDataAtUnchecked(JSRegExp::code_index(is_ascii), |
| 773 | Smi::FromInt(JSRegExp::kUninitializedValue), |
| 774 | heap); |
| 775 | re->SetDataAtUnchecked(JSRegExp::saved_code_index(is_ascii), |
| 776 | Smi::FromInt(JSRegExp::kUninitializedValue), |
| 777 | heap); |
| 778 | } |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | |
| 783 | // Works by setting the current sweep_generation (as a smi) in the |
| 784 | // code object place in the data array of the RegExp and keeps a copy |
| 785 | // around that can be reinstated if we reuse the RegExp before flushing. |
| 786 | // If we did not use the code for kRegExpCodeThreshold mark sweep GCs |
| 787 | // we flush the code. |
| 788 | static void VisitRegExpAndFlushCode(Map* map, HeapObject* object) { |
| 789 | Heap* heap = map->heap(); |
| 790 | MarkCompactCollector* collector = heap->mark_compact_collector(); |
| 791 | if (!collector->is_code_flushing_enabled()) { |
| 792 | VisitJSRegExpFields(map, object); |
| 793 | return; |
| 794 | } |
| 795 | JSRegExp* re = reinterpret_cast<JSRegExp*>(object); |
| 796 | // Flush code or set age on both ascii and two byte code. |
| 797 | UpdateRegExpCodeAgeAndFlush(heap, re, true); |
| 798 | UpdateRegExpCodeAgeAndFlush(heap, re, false); |
| 799 | // Visit the fields of the RegExp, including the updated FixedArray. |
| 800 | VisitJSRegExpFields(map, object); |
| 801 | } |
| 802 | |
| 803 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 804 | static void VisitSharedFunctionInfoAndFlushCode(Map* map, |
| 805 | HeapObject* object) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 806 | MarkCompactCollector* collector = map->heap()->mark_compact_collector(); |
| 807 | if (!collector->is_code_flushing_enabled()) { |
| 808 | VisitSharedFunctionInfoGeneric(map, object); |
| 809 | return; |
| 810 | } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 811 | VisitSharedFunctionInfoAndFlushCodeGeneric(map, object, false); |
| 812 | } |
| 813 | |
| 814 | |
| 815 | static void VisitSharedFunctionInfoAndFlushCodeGeneric( |
| 816 | Map* map, HeapObject* object, bool known_flush_code_candidate) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 817 | Heap* heap = map->heap(); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 818 | SharedFunctionInfo* shared = reinterpret_cast<SharedFunctionInfo*>(object); |
| 819 | |
| 820 | if (shared->IsInobjectSlackTrackingInProgress()) shared->DetachInitialMap(); |
| 821 | |
| 822 | if (!known_flush_code_candidate) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 823 | known_flush_code_candidate = IsFlushable(heap, shared); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 824 | if (known_flush_code_candidate) { |
| 825 | heap->mark_compact_collector()->code_flusher()->AddCandidate(shared); |
| 826 | } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 827 | } |
| 828 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 829 | VisitSharedFunctionInfoFields(heap, object, known_flush_code_candidate); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 830 | } |
| 831 | |
| 832 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 833 | static void VisitCodeEntry(Heap* heap, Address entry_address) { |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 834 | Object* code = Code::GetObjectFromEntryAddress(entry_address); |
| 835 | Object* old_code = code; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 836 | VisitPointer(heap, &code); |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 837 | if (code != old_code) { |
| 838 | Memory::Address_at(entry_address) = |
| 839 | reinterpret_cast<Code*>(code)->entry(); |
| 840 | } |
| 841 | } |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 842 | |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 843 | |
| 844 | static void VisitJSFunctionAndFlushCode(Map* map, HeapObject* object) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 845 | Heap* heap = map->heap(); |
| 846 | MarkCompactCollector* collector = heap->mark_compact_collector(); |
| 847 | if (!collector->is_code_flushing_enabled()) { |
| 848 | VisitJSFunction(map, object); |
| 849 | return; |
| 850 | } |
| 851 | |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 852 | JSFunction* jsfunction = reinterpret_cast<JSFunction*>(object); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 853 | // The function must have a valid context and not be a builtin. |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 854 | bool flush_code_candidate = false; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 855 | if (IsValidNotBuiltinContext(jsfunction->unchecked_context())) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 856 | flush_code_candidate = FlushCodeForFunction(heap, jsfunction); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 857 | } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 858 | |
| 859 | if (!flush_code_candidate) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 860 | collector->MarkObject(jsfunction->unchecked_shared()->unchecked_code()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 861 | |
| 862 | if (jsfunction->unchecked_code()->kind() == Code::OPTIMIZED_FUNCTION) { |
| 863 | // For optimized functions we should retain both non-optimized version |
| 864 | // of it's code and non-optimized version of all inlined functions. |
| 865 | // This is required to support bailing out from inlined code. |
| 866 | DeoptimizationInputData* data = |
| 867 | reinterpret_cast<DeoptimizationInputData*>( |
| 868 | jsfunction->unchecked_code()->unchecked_deoptimization_data()); |
| 869 | |
| 870 | FixedArray* literals = data->UncheckedLiteralArray(); |
| 871 | |
| 872 | for (int i = 0, count = data->InlinedFunctionCount()->value(); |
| 873 | i < count; |
| 874 | i++) { |
| 875 | JSFunction* inlined = reinterpret_cast<JSFunction*>(literals->get(i)); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 876 | collector->MarkObject(inlined->unchecked_shared()->unchecked_code()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 877 | } |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | VisitJSFunctionFields(map, |
| 882 | reinterpret_cast<JSFunction*>(object), |
| 883 | flush_code_candidate); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 884 | } |
| 885 | |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 886 | |
| 887 | static void VisitJSFunction(Map* map, HeapObject* object) { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 888 | VisitJSFunctionFields(map, |
| 889 | reinterpret_cast<JSFunction*>(object), |
| 890 | false); |
| 891 | } |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 892 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 893 | |
| 894 | #define SLOT_ADDR(obj, offset) \ |
| 895 | reinterpret_cast<Object**>((obj)->address() + offset) |
| 896 | |
| 897 | |
| 898 | static inline void VisitJSFunctionFields(Map* map, |
| 899 | JSFunction* object, |
| 900 | bool flush_code_candidate) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 901 | Heap* heap = map->heap(); |
| 902 | MarkCompactCollector* collector = heap->mark_compact_collector(); |
| 903 | |
| 904 | VisitPointers(heap, |
| 905 | SLOT_ADDR(object, JSFunction::kPropertiesOffset), |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 906 | SLOT_ADDR(object, JSFunction::kCodeEntryOffset)); |
| 907 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 908 | if (!flush_code_candidate) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 909 | VisitCodeEntry(heap, object->address() + JSFunction::kCodeEntryOffset); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 910 | } else { |
| 911 | // Don't visit code object. |
| 912 | |
| 913 | // Visit shared function info to avoid double checking of it's |
| 914 | // flushability. |
| 915 | SharedFunctionInfo* shared_info = object->unchecked_shared(); |
| 916 | if (!shared_info->IsMarked()) { |
| 917 | Map* shared_info_map = shared_info->map(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 918 | collector->SetMark(shared_info); |
| 919 | collector->MarkObject(shared_info_map); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 920 | VisitSharedFunctionInfoAndFlushCodeGeneric(shared_info_map, |
| 921 | shared_info, |
| 922 | true); |
| 923 | } |
| 924 | } |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 925 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 926 | VisitPointers(heap, |
| 927 | SLOT_ADDR(object, |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 928 | JSFunction::kCodeEntryOffset + kPointerSize), |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 929 | SLOT_ADDR(object, JSFunction::kNonWeakFieldsEndOffset)); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 930 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 931 | // Don't visit the next function list field as it is a weak reference. |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 932 | } |
| 933 | |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 934 | static inline void VisitJSRegExpFields(Map* map, |
| 935 | HeapObject* object) { |
| 936 | int last_property_offset = |
| 937 | JSRegExp::kSize + kPointerSize * map->inobject_properties(); |
| 938 | VisitPointers(map->heap(), |
| 939 | SLOT_ADDR(object, JSRegExp::kPropertiesOffset), |
| 940 | SLOT_ADDR(object, last_property_offset)); |
| 941 | } |
| 942 | |
erik.corry@gmail.com | 145eff5 | 2010-08-23 11:36:18 +0000 | [diff] [blame] | 943 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 944 | static void VisitSharedFunctionInfoFields(Heap* heap, |
| 945 | HeapObject* object, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 946 | bool flush_code_candidate) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 947 | VisitPointer(heap, SLOT_ADDR(object, SharedFunctionInfo::kNameOffset)); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 948 | |
| 949 | if (!flush_code_candidate) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 950 | VisitPointer(heap, SLOT_ADDR(object, SharedFunctionInfo::kCodeOffset)); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 951 | } |
| 952 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 953 | VisitPointers(heap, |
| 954 | SLOT_ADDR(object, SharedFunctionInfo::kScopeInfoOffset), |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 955 | SLOT_ADDR(object, SharedFunctionInfo::kSize)); |
| 956 | } |
| 957 | |
| 958 | #undef SLOT_ADDR |
| 959 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 960 | typedef void (*Callback)(Map* map, HeapObject* object); |
| 961 | |
| 962 | static VisitorDispatchTable<Callback> table_; |
| 963 | }; |
| 964 | |
| 965 | |
| 966 | VisitorDispatchTable<StaticMarkingVisitor::Callback> |
| 967 | StaticMarkingVisitor::table_; |
| 968 | |
| 969 | |
| 970 | class MarkingVisitor : public ObjectVisitor { |
| 971 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 972 | explicit MarkingVisitor(Heap* heap) : heap_(heap) { } |
| 973 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 974 | void VisitPointer(Object** p) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 975 | StaticMarkingVisitor::VisitPointer(heap_, p); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 976 | } |
| 977 | |
| 978 | void VisitPointers(Object** start, Object** end) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 979 | StaticMarkingVisitor::VisitPointers(heap_, start, end); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 980 | } |
| 981 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 982 | private: |
| 983 | Heap* heap_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 984 | }; |
| 985 | |
| 986 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 987 | class CodeMarkingVisitor : public ThreadVisitor { |
| 988 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 989 | explicit CodeMarkingVisitor(MarkCompactCollector* collector) |
| 990 | : collector_(collector) {} |
| 991 | |
vegorov@chromium.org | 74f333b | 2011-04-06 11:17:46 +0000 | [diff] [blame] | 992 | void VisitThread(Isolate* isolate, ThreadLocalTop* top) { |
| 993 | for (StackFrameIterator it(isolate, top); !it.done(); it.Advance()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 994 | collector_->MarkObject(it.frame()->unchecked_code()); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 995 | } |
| 996 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 997 | |
| 998 | private: |
| 999 | MarkCompactCollector* collector_; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1000 | }; |
| 1001 | |
| 1002 | |
| 1003 | class SharedFunctionInfoMarkingVisitor : public ObjectVisitor { |
| 1004 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1005 | explicit SharedFunctionInfoMarkingVisitor(MarkCompactCollector* collector) |
| 1006 | : collector_(collector) {} |
| 1007 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1008 | void VisitPointers(Object** start, Object** end) { |
| 1009 | for (Object** p = start; p < end; p++) VisitPointer(p); |
| 1010 | } |
| 1011 | |
| 1012 | void VisitPointer(Object** slot) { |
| 1013 | Object* obj = *slot; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1014 | if (obj->IsSharedFunctionInfo()) { |
| 1015 | SharedFunctionInfo* shared = reinterpret_cast<SharedFunctionInfo*>(obj); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1016 | collector_->MarkObject(shared->unchecked_code()); |
| 1017 | collector_->MarkObject(shared); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1018 | } |
| 1019 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1020 | |
| 1021 | private: |
| 1022 | MarkCompactCollector* collector_; |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1023 | }; |
| 1024 | |
| 1025 | |
| 1026 | void MarkCompactCollector::PrepareForCodeFlushing() { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1027 | ASSERT(heap() == Isolate::Current()->heap()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1028 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1029 | if (!FLAG_flush_code) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1030 | EnableCodeFlushing(false); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1031 | return; |
| 1032 | } |
| 1033 | |
| 1034 | #ifdef ENABLE_DEBUGGER_SUPPORT |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1035 | if (heap()->isolate()->debug()->IsLoaded() || |
| 1036 | heap()->isolate()->debug()->has_break_points()) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1037 | EnableCodeFlushing(false); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1038 | return; |
| 1039 | } |
| 1040 | #endif |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1041 | EnableCodeFlushing(true); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1042 | |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 1043 | // Ensure that empty descriptor array is marked. Method MarkDescriptorArray |
| 1044 | // relies on it being marked before any other descriptor array. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1045 | MarkObject(heap()->raw_unchecked_empty_descriptor_array()); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 1046 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1047 | // Make sure we are not referencing the code from the stack. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1048 | ASSERT(this == heap()->mark_compact_collector()); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1049 | for (StackFrameIterator it; !it.done(); it.Advance()) { |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 1050 | MarkObject(it.frame()->unchecked_code()); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1051 | } |
| 1052 | |
| 1053 | // Iterate the archived stacks in all threads to check if |
| 1054 | // the code is referenced. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1055 | CodeMarkingVisitor code_marking_visitor(this); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1056 | heap()->isolate()->thread_manager()->IterateArchivedThreads( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1057 | &code_marking_visitor); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1058 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1059 | SharedFunctionInfoMarkingVisitor visitor(this); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1060 | heap()->isolate()->compilation_cache()->IterateFunctions(&visitor); |
| 1061 | heap()->isolate()->handle_scope_implementer()->Iterate(&visitor); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1062 | |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 1063 | ProcessMarkingStack(); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1064 | } |
| 1065 | |
| 1066 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1067 | // Visitor class for marking heap roots. |
| 1068 | class RootMarkingVisitor : public ObjectVisitor { |
| 1069 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1070 | explicit RootMarkingVisitor(Heap* heap) |
| 1071 | : collector_(heap->mark_compact_collector()) { } |
| 1072 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1073 | void VisitPointer(Object** p) { |
| 1074 | MarkObjectByPointer(p); |
| 1075 | } |
| 1076 | |
| 1077 | void VisitPointers(Object** start, Object** end) { |
| 1078 | for (Object** p = start; p < end; p++) MarkObjectByPointer(p); |
| 1079 | } |
| 1080 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1081 | private: |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1082 | void MarkObjectByPointer(Object** p) { |
| 1083 | if (!(*p)->IsHeapObject()) return; |
| 1084 | |
| 1085 | // Replace flat cons strings in place. |
| 1086 | HeapObject* object = ShortCircuitConsString(p); |
| 1087 | if (object->IsMarked()) return; |
| 1088 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1089 | Map* map = object->map(); |
| 1090 | // Mark the object. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1091 | collector_->SetMark(object); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1092 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1093 | // Mark the map pointer and body, and push them on the marking stack. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1094 | collector_->MarkObject(map); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1095 | StaticMarkingVisitor::IterateBody(map, object); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1096 | |
| 1097 | // Mark all the objects reachable from the map and body. May leave |
| 1098 | // overflowed objects in the heap. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1099 | collector_->EmptyMarkingStack(); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1100 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1101 | |
| 1102 | MarkCompactCollector* collector_; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1103 | }; |
| 1104 | |
| 1105 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1106 | // Helper class for pruning the symbol table. |
| 1107 | class SymbolTableCleaner : public ObjectVisitor { |
| 1108 | public: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1109 | explicit SymbolTableCleaner(Heap* heap) |
| 1110 | : heap_(heap), pointers_removed_(0) { } |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1111 | |
| 1112 | virtual void VisitPointers(Object** start, Object** end) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1113 | // Visit all HeapObject pointers in [start, end). |
| 1114 | for (Object** p = start; p < end; p++) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1115 | if ((*p)->IsHeapObject() && !HeapObject::cast(*p)->IsMarked()) { |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 1116 | // Check if the symbol being pruned is an external symbol. We need to |
| 1117 | // delete the associated external data as this symbol is going away. |
| 1118 | |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 1119 | // Since no objects have yet been moved we can safely access the map of |
| 1120 | // the object. |
kmillikin@chromium.org | 13bd294 | 2009-12-16 15:36:05 +0000 | [diff] [blame] | 1121 | if ((*p)->IsExternalString()) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1122 | heap_->FinalizeExternalString(String::cast(*p)); |
ager@chromium.org | 6f10e41 | 2009-02-13 10:11:16 +0000 | [diff] [blame] | 1123 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1124 | // Set the entry to null_value (as deleted). |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1125 | *p = heap_->raw_unchecked_null_value(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1126 | pointers_removed_++; |
| 1127 | } |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | int PointersRemoved() { |
| 1132 | return pointers_removed_; |
| 1133 | } |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 1134 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1135 | private: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1136 | Heap* heap_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1137 | int pointers_removed_; |
| 1138 | }; |
| 1139 | |
| 1140 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1141 | // Implementation of WeakObjectRetainer for mark compact GCs. All marked objects |
| 1142 | // are retained. |
| 1143 | class MarkCompactWeakObjectRetainer : public WeakObjectRetainer { |
| 1144 | public: |
| 1145 | virtual Object* RetainAs(Object* object) { |
| 1146 | MapWord first_word = HeapObject::cast(object)->map_word(); |
| 1147 | if (first_word.IsMarked()) { |
| 1148 | return object; |
| 1149 | } else { |
| 1150 | return NULL; |
| 1151 | } |
| 1152 | } |
| 1153 | }; |
| 1154 | |
| 1155 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1156 | void MarkCompactCollector::MarkUnmarkedObject(HeapObject* object) { |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1157 | ASSERT(!object->IsMarked()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1158 | ASSERT(HEAP->Contains(object)); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1159 | if (object->IsMap()) { |
| 1160 | Map* map = Map::cast(object); |
ager@chromium.org | ea91cc5 | 2011-05-23 06:06:11 +0000 | [diff] [blame] | 1161 | if (FLAG_cleanup_code_caches_at_gc) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1162 | map->ClearCodeCache(heap()); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1163 | } |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 1164 | SetMark(map); |
ricow@chromium.org | c54d365 | 2011-05-30 09:20:16 +0000 | [diff] [blame] | 1165 | |
| 1166 | // When map collection is enabled we have to mark through map's transitions |
| 1167 | // in a special way to make transition links weak. |
ricow@chromium.org | d2be901 | 2011-06-01 06:00:58 +0000 | [diff] [blame] | 1168 | // Only maps for subclasses of JSReceiver can have transitions. |
| 1169 | STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE); |
| 1170 | if (FLAG_collect_maps && map->instance_type() >= FIRST_JS_RECEIVER_TYPE) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1171 | MarkMapContents(map); |
| 1172 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1173 | marking_stack_.Push(map); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1174 | } |
| 1175 | } else { |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 1176 | SetMark(object); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1177 | marking_stack_.Push(object); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | |
| 1182 | void MarkCompactCollector::MarkMapContents(Map* map) { |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1183 | // Mark prototype transitions array but don't push it into marking stack. |
| 1184 | // This will make references from it weak. We will clean dead prototype |
| 1185 | // transitions in ClearNonLiveTransitions. |
| 1186 | FixedArray* prototype_transitions = map->unchecked_prototype_transitions(); |
| 1187 | if (!prototype_transitions->IsMarked()) SetMark(prototype_transitions); |
| 1188 | |
danno@chromium.org | 40cb878 | 2011-05-25 07:58:50 +0000 | [diff] [blame] | 1189 | Object* raw_descriptor_array = |
| 1190 | *HeapObject::RawField(map, |
| 1191 | Map::kInstanceDescriptorsOrBitField3Offset); |
| 1192 | if (!raw_descriptor_array->IsSmi()) { |
| 1193 | MarkDescriptorArray( |
| 1194 | reinterpret_cast<DescriptorArray*>(raw_descriptor_array)); |
| 1195 | } |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1196 | |
| 1197 | // Mark the Object* fields of the Map. |
| 1198 | // Since the descriptor array has been marked already, it is fine |
| 1199 | // that one of these fields contains a pointer to it. |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1200 | Object** start_slot = HeapObject::RawField(map, |
| 1201 | Map::kPointerFieldsBeginOffset); |
| 1202 | |
| 1203 | Object** end_slot = HeapObject::RawField(map, Map::kPointerFieldsEndOffset); |
| 1204 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1205 | StaticMarkingVisitor::VisitPointers(map->heap(), start_slot, end_slot); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | |
| 1209 | void MarkCompactCollector::MarkDescriptorArray( |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1210 | DescriptorArray* descriptors) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1211 | if (descriptors->IsMarked()) return; |
| 1212 | // Empty descriptor array is marked as a root before any maps are marked. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1213 | ASSERT(descriptors != HEAP->raw_unchecked_empty_descriptor_array()); |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 1214 | SetMark(descriptors); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1215 | |
| 1216 | FixedArray* contents = reinterpret_cast<FixedArray*>( |
| 1217 | descriptors->get(DescriptorArray::kContentArrayIndex)); |
| 1218 | ASSERT(contents->IsHeapObject()); |
| 1219 | ASSERT(!contents->IsMarked()); |
| 1220 | ASSERT(contents->IsFixedArray()); |
| 1221 | ASSERT(contents->length() >= 2); |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 1222 | SetMark(contents); |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 1223 | // Contents contains (value, details) pairs. If the details say that the type |
| 1224 | // of descriptor is MAP_TRANSITION, CONSTANT_TRANSITION, |
| 1225 | // EXTERNAL_ARRAY_TRANSITION or NULL_DESCRIPTOR, we don't mark the value as |
| 1226 | // live. Only for MAP_TRANSITION, EXTERNAL_ARRAY_TRANSITION and |
| 1227 | // CONSTANT_TRANSITION is the value an Object* (a Map*). |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1228 | for (int i = 0; i < contents->length(); i += 2) { |
| 1229 | // If the pair (value, details) at index i, i+1 is not |
| 1230 | // a transition or null descriptor, mark the value. |
| 1231 | PropertyDetails details(Smi::cast(contents->get(i + 1))); |
| 1232 | if (details.type() < FIRST_PHANTOM_PROPERTY_TYPE) { |
| 1233 | HeapObject* object = reinterpret_cast<HeapObject*>(contents->get(i)); |
| 1234 | if (object->IsHeapObject() && !object->IsMarked()) { |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 1235 | SetMark(object); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1236 | marking_stack_.Push(object); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1237 | } |
| 1238 | } |
| 1239 | } |
| 1240 | // The DescriptorArray descriptors contains a pointer to its contents array, |
| 1241 | // but the contents array is already marked. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1242 | marking_stack_.Push(descriptors); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1243 | } |
| 1244 | |
| 1245 | |
| 1246 | void MarkCompactCollector::CreateBackPointers() { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1247 | HeapObjectIterator iterator(heap()->map_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1248 | for (HeapObject* next_object = iterator.next(); |
| 1249 | next_object != NULL; next_object = iterator.next()) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1250 | if (next_object->IsMap()) { // Could also be ByteArray on free list. |
| 1251 | Map* map = Map::cast(next_object); |
ricow@chromium.org | d2be901 | 2011-06-01 06:00:58 +0000 | [diff] [blame] | 1252 | STATIC_ASSERT(LAST_TYPE == LAST_CALLABLE_SPEC_OBJECT_TYPE); |
| 1253 | if (map->instance_type() >= FIRST_JS_RECEIVER_TYPE) { |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1254 | map->CreateBackPointers(); |
| 1255 | } else { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1256 | ASSERT(map->instance_descriptors() == heap()->empty_descriptor_array()); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1257 | } |
| 1258 | } |
| 1259 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1260 | } |
| 1261 | |
| 1262 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1263 | static int OverflowObjectSize(HeapObject* obj) { |
| 1264 | // Recover the normal map pointer, it might be marked as live and |
| 1265 | // overflowed. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1266 | MapWord map_word = obj->map_word(); |
| 1267 | map_word.ClearMark(); |
| 1268 | map_word.ClearOverflow(); |
| 1269 | return obj->SizeFromMap(map_word.ToMap()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1270 | } |
| 1271 | |
| 1272 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1273 | class OverflowedObjectsScanner : public AllStatic { |
| 1274 | public: |
| 1275 | // Fill the marking stack with overflowed objects returned by the given |
| 1276 | // iterator. Stop when the marking stack is filled or the end of the space |
| 1277 | // is reached, whichever comes first. |
| 1278 | template<class T> |
| 1279 | static inline void ScanOverflowedObjects(MarkCompactCollector* collector, |
| 1280 | T* it) { |
| 1281 | // The caller should ensure that the marking stack is initially not full, |
| 1282 | // so that we don't waste effort pointlessly scanning for objects. |
| 1283 | ASSERT(!collector->marking_stack_.is_full()); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1284 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1285 | for (HeapObject* object = it->next(); object != NULL; object = it->next()) { |
| 1286 | if (object->IsOverflowed()) { |
| 1287 | object->ClearOverflow(); |
| 1288 | ASSERT(object->IsMarked()); |
| 1289 | ASSERT(HEAP->Contains(object)); |
| 1290 | collector->marking_stack_.Push(object); |
| 1291 | if (collector->marking_stack_.is_full()) return; |
| 1292 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1293 | } |
| 1294 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1295 | }; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1296 | |
| 1297 | |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1298 | bool MarkCompactCollector::IsUnmarkedHeapObject(Object** p) { |
| 1299 | return (*p)->IsHeapObject() && !HeapObject::cast(*p)->IsMarked(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1300 | } |
| 1301 | |
| 1302 | |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1303 | void MarkCompactCollector::MarkSymbolTable() { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1304 | SymbolTable* symbol_table = heap()->raw_unchecked_symbol_table(); |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1305 | // Mark the symbol table itself. |
| 1306 | SetMark(symbol_table); |
| 1307 | // Explicitly mark the prefix. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1308 | MarkingVisitor marker(heap()); |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1309 | symbol_table->IteratePrefix(&marker); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1310 | ProcessMarkingStack(); |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1311 | } |
| 1312 | |
| 1313 | |
| 1314 | void MarkCompactCollector::MarkRoots(RootMarkingVisitor* visitor) { |
| 1315 | // Mark the heap roots including global variables, stack variables, |
| 1316 | // etc., and all objects reachable from them. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1317 | heap()->IterateStrongRoots(visitor, VISIT_ONLY_STRONG); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1318 | |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1319 | // Handle the symbol table specially. |
| 1320 | MarkSymbolTable(); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1321 | |
| 1322 | // There may be overflowed objects in the heap. Visit them now. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1323 | while (marking_stack_.overflowed()) { |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1324 | RefillMarkingStack(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1325 | EmptyMarkingStack(); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1326 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1327 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1328 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1329 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1330 | void MarkCompactCollector::MarkObjectGroups() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1331 | List<ObjectGroup*>* object_groups = |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1332 | heap()->isolate()->global_handles()->object_groups(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1333 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1334 | int last = 0; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1335 | for (int i = 0; i < object_groups->length(); i++) { |
| 1336 | ObjectGroup* entry = object_groups->at(i); |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1337 | ASSERT(entry != NULL); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1338 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1339 | Object*** objects = entry->objects_; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1340 | bool group_marked = false; |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1341 | for (size_t j = 0; j < entry->length_; j++) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1342 | Object* object = *objects[j]; |
| 1343 | if (object->IsHeapObject() && HeapObject::cast(object)->IsMarked()) { |
| 1344 | group_marked = true; |
| 1345 | break; |
| 1346 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1347 | } |
| 1348 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1349 | if (!group_marked) { |
| 1350 | (*object_groups)[last++] = entry; |
| 1351 | continue; |
| 1352 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1353 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1354 | // An object in the group is marked, so mark all heap objects in |
| 1355 | // the group. |
| 1356 | for (size_t j = 0; j < entry->length_; ++j) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1357 | if ((*objects[j])->IsHeapObject()) { |
| 1358 | MarkObject(HeapObject::cast(*objects[j])); |
| 1359 | } |
| 1360 | } |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1361 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1362 | // Once the entire group has been marked, dispose it because it's |
| 1363 | // not needed anymore. |
| 1364 | entry->Dispose(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1365 | } |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1366 | object_groups->Rewind(last); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1367 | } |
| 1368 | |
| 1369 | |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1370 | void MarkCompactCollector::MarkImplicitRefGroups() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1371 | List<ImplicitRefGroup*>* ref_groups = |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1372 | heap()->isolate()->global_handles()->implicit_ref_groups(); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1373 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1374 | int last = 0; |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1375 | for (int i = 0; i < ref_groups->length(); i++) { |
| 1376 | ImplicitRefGroup* entry = ref_groups->at(i); |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1377 | ASSERT(entry != NULL); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1378 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1379 | if (!(*entry->parent_)->IsMarked()) { |
| 1380 | (*ref_groups)[last++] = entry; |
| 1381 | continue; |
| 1382 | } |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1383 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1384 | Object*** children = entry->children_; |
| 1385 | // A parent object is marked, so mark all child heap objects. |
| 1386 | for (size_t j = 0; j < entry->length_; ++j) { |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1387 | if ((*children[j])->IsHeapObject()) { |
| 1388 | MarkObject(HeapObject::cast(*children[j])); |
| 1389 | } |
| 1390 | } |
| 1391 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1392 | // Once the entire group has been marked, dispose it because it's |
| 1393 | // not needed anymore. |
| 1394 | entry->Dispose(); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1395 | } |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 1396 | ref_groups->Rewind(last); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1397 | } |
| 1398 | |
| 1399 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1400 | // Mark all objects reachable from the objects on the marking stack. |
| 1401 | // Before: the marking stack contains zero or more heap object pointers. |
| 1402 | // After: the marking stack is empty, and all objects reachable from the |
| 1403 | // marking stack have been marked, or are overflowed in the heap. |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1404 | void MarkCompactCollector::EmptyMarkingStack() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1405 | while (!marking_stack_.is_empty()) { |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 1406 | while (!marking_stack_.is_empty()) { |
| 1407 | HeapObject* object = marking_stack_.Pop(); |
| 1408 | ASSERT(object->IsHeapObject()); |
| 1409 | ASSERT(heap()->Contains(object)); |
| 1410 | ASSERT(object->IsMarked()); |
| 1411 | ASSERT(!object->IsOverflowed()); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1412 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 1413 | // Because the object is marked, we have to recover the original map |
| 1414 | // pointer and use it to mark the object's body. |
| 1415 | MapWord map_word = object->map_word(); |
| 1416 | map_word.ClearMark(); |
| 1417 | Map* map = map_word.ToMap(); |
| 1418 | MarkObject(map); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1419 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 1420 | StaticMarkingVisitor::IterateBody(map, object); |
| 1421 | } |
| 1422 | |
| 1423 | // Process encountered weak maps, mark objects only reachable by those |
| 1424 | // weak maps and repeat until fix-point is reached. |
| 1425 | ProcessWeakMaps(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1426 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1427 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1428 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1429 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1430 | // Sweep the heap for overflowed objects, clear their overflow bits, and |
| 1431 | // push them on the marking stack. Stop early if the marking stack fills |
| 1432 | // before sweeping completes. If sweeping completes, there are no remaining |
| 1433 | // overflowed objects in the heap so the overflow flag on the markings stack |
| 1434 | // is cleared. |
| 1435 | void MarkCompactCollector::RefillMarkingStack() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1436 | ASSERT(marking_stack_.overflowed()); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1437 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1438 | SemiSpaceIterator new_it(heap()->new_space(), &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1439 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &new_it); |
| 1440 | if (marking_stack_.is_full()) return; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1441 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1442 | HeapObjectIterator old_pointer_it(heap()->old_pointer_space(), |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1443 | &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1444 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &old_pointer_it); |
| 1445 | if (marking_stack_.is_full()) return; |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1446 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1447 | HeapObjectIterator old_data_it(heap()->old_data_space(), &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1448 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &old_data_it); |
| 1449 | if (marking_stack_.is_full()) return; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1450 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1451 | HeapObjectIterator code_it(heap()->code_space(), &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1452 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &code_it); |
| 1453 | if (marking_stack_.is_full()) return; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1454 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1455 | HeapObjectIterator map_it(heap()->map_space(), &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1456 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &map_it); |
| 1457 | if (marking_stack_.is_full()) return; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1458 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1459 | HeapObjectIterator cell_it(heap()->cell_space(), &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1460 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &cell_it); |
| 1461 | if (marking_stack_.is_full()) return; |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1462 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1463 | LargeObjectIterator lo_it(heap()->lo_space(), &OverflowObjectSize); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1464 | OverflowedObjectsScanner::ScanOverflowedObjects(this, &lo_it); |
| 1465 | if (marking_stack_.is_full()) return; |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1466 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1467 | marking_stack_.clear_overflowed(); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1468 | } |
| 1469 | |
| 1470 | |
| 1471 | // Mark all objects reachable (transitively) from objects on the marking |
| 1472 | // stack. Before: the marking stack contains zero or more heap object |
| 1473 | // pointers. After: the marking stack is empty and there are no overflowed |
| 1474 | // objects in the heap. |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1475 | void MarkCompactCollector::ProcessMarkingStack() { |
| 1476 | EmptyMarkingStack(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1477 | while (marking_stack_.overflowed()) { |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1478 | RefillMarkingStack(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1479 | EmptyMarkingStack(); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1480 | } |
| 1481 | } |
| 1482 | |
| 1483 | |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1484 | void MarkCompactCollector::ProcessExternalMarking() { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1485 | bool work_to_do = true; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1486 | ASSERT(marking_stack_.is_empty()); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1487 | while (work_to_do) { |
| 1488 | MarkObjectGroups(); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1489 | MarkImplicitRefGroups(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1490 | work_to_do = !marking_stack_.is_empty(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1491 | ProcessMarkingStack(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1492 | } |
| 1493 | } |
| 1494 | |
| 1495 | |
| 1496 | void MarkCompactCollector::MarkLiveObjects() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 1497 | GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_MARK); |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 1498 | // The recursive GC marker detects when it is nearing stack overflow, |
| 1499 | // and switches to a different marking system. JS interrupts interfere |
| 1500 | // with the C stack limit check. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1501 | PostponeInterruptsScope postpone(heap()->isolate()); |
ager@chromium.org | 5f0c45f | 2010-12-17 08:51:21 +0000 | [diff] [blame] | 1502 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1503 | #ifdef DEBUG |
| 1504 | ASSERT(state_ == PREPARE_GC); |
| 1505 | state_ = MARK_LIVE_OBJECTS; |
| 1506 | #endif |
| 1507 | // The to space contains live objects, the from space is used as a marking |
| 1508 | // stack. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1509 | marking_stack_.Initialize(heap()->new_space()->FromSpaceLow(), |
| 1510 | heap()->new_space()->FromSpaceHigh()); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1511 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1512 | ASSERT(!marking_stack_.overflowed()); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1513 | |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 1514 | PrepareForCodeFlushing(); |
| 1515 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1516 | RootMarkingVisitor root_visitor(heap()); |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1517 | MarkRoots(&root_visitor); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1518 | |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1519 | // The objects reachable from the roots are marked, yet unreachable |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1520 | // objects are unmarked. Mark objects reachable due to host |
| 1521 | // application specific logic. |
| 1522 | ProcessExternalMarking(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1523 | |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1524 | // The objects reachable from the roots or object groups are marked, |
| 1525 | // yet unreachable objects are unmarked. Mark objects reachable |
| 1526 | // only from weak global handles. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1527 | // |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1528 | // First we identify nonlive weak handles and mark them as pending |
| 1529 | // destruction. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1530 | heap()->isolate()->global_handles()->IdentifyWeakHandles( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1531 | &IsUnmarkedHeapObject); |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1532 | // Then we mark the objects and process the transitive closure. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1533 | heap()->isolate()->global_handles()->IterateWeakRoots(&root_visitor); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1534 | while (marking_stack_.overflowed()) { |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1535 | RefillMarkingStack(); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 1536 | EmptyMarkingStack(); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1537 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1538 | |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 1539 | // Repeat host application specific marking to mark unmarked objects |
| 1540 | // reachable from the weak roots. |
| 1541 | ProcessExternalMarking(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1542 | |
ricow@chromium.org | 4f693d6 | 2011-07-04 14:01:31 +0000 | [diff] [blame] | 1543 | // Object literal map caches reference symbols (cache keys) and maps |
| 1544 | // (cache values). At this point still useful maps have already been |
| 1545 | // marked. Mark the keys for the alive values before we process the |
| 1546 | // symbol table. |
| 1547 | ProcessMapCaches(); |
| 1548 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1549 | // Prune the symbol table removing all symbols only pointed to by the |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1550 | // symbol table. Cannot use symbol_table() here because the symbol |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1551 | // table is marked. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1552 | SymbolTable* symbol_table = heap()->raw_unchecked_symbol_table(); |
| 1553 | SymbolTableCleaner v(heap()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1554 | symbol_table->IterateElements(&v); |
| 1555 | symbol_table->ElementsRemoved(v.PointersRemoved()); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1556 | heap()->external_string_table_.Iterate(&v); |
| 1557 | heap()->external_string_table_.CleanUp(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1558 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1559 | // Process the weak references. |
| 1560 | MarkCompactWeakObjectRetainer mark_compact_object_retainer; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1561 | heap()->ProcessWeakReferences(&mark_compact_object_retainer); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 1562 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1563 | // Remove object groups after marking phase. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1564 | heap()->isolate()->global_handles()->RemoveObjectGroups(); |
| 1565 | heap()->isolate()->global_handles()->RemoveImplicitRefGroups(); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 1566 | |
| 1567 | // Flush code from collected candidates. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1568 | if (is_code_flushing_enabled()) { |
| 1569 | code_flusher_->ProcessCandidates(); |
| 1570 | } |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 1571 | |
| 1572 | // Clean up dead objects from the runtime profiler. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1573 | heap()->isolate()->runtime_profiler()->RemoveDeadSamples(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1574 | } |
| 1575 | |
| 1576 | |
ricow@chromium.org | 4f693d6 | 2011-07-04 14:01:31 +0000 | [diff] [blame] | 1577 | void MarkCompactCollector::ProcessMapCaches() { |
| 1578 | Object* raw_context = heap()->global_contexts_list_; |
| 1579 | while (raw_context != heap()->undefined_value()) { |
| 1580 | Context* context = reinterpret_cast<Context*>(raw_context); |
| 1581 | if (context->IsMarked()) { |
| 1582 | HeapObject* raw_map_cache = |
| 1583 | HeapObject::cast(context->get(Context::MAP_CACHE_INDEX)); |
| 1584 | // A map cache may be reachable from the stack. In this case |
| 1585 | // it's already transitively marked and it's too late to clean |
| 1586 | // up its parts. |
| 1587 | if (!raw_map_cache->IsMarked() && |
| 1588 | raw_map_cache != heap()->undefined_value()) { |
| 1589 | MapCache* map_cache = reinterpret_cast<MapCache*>(raw_map_cache); |
| 1590 | int existing_elements = map_cache->NumberOfElements(); |
| 1591 | int used_elements = 0; |
| 1592 | for (int i = MapCache::kElementsStartIndex; |
| 1593 | i < map_cache->length(); |
| 1594 | i += MapCache::kEntrySize) { |
| 1595 | Object* raw_key = map_cache->get(i); |
| 1596 | if (raw_key == heap()->undefined_value() || |
| 1597 | raw_key == heap()->null_value()) continue; |
| 1598 | STATIC_ASSERT(MapCache::kEntrySize == 2); |
| 1599 | Object* raw_map = map_cache->get(i + 1); |
| 1600 | if (raw_map->IsHeapObject() && |
| 1601 | HeapObject::cast(raw_map)->IsMarked()) { |
| 1602 | ++used_elements; |
| 1603 | } else { |
| 1604 | // Delete useless entries with unmarked maps. |
| 1605 | ASSERT(raw_map->IsMap()); |
| 1606 | map_cache->set_null_unchecked(heap(), i); |
| 1607 | map_cache->set_null_unchecked(heap(), i + 1); |
| 1608 | } |
| 1609 | } |
| 1610 | if (used_elements == 0) { |
| 1611 | context->set(Context::MAP_CACHE_INDEX, heap()->undefined_value()); |
| 1612 | } else { |
| 1613 | // Note: we don't actually shrink the cache here to avoid |
| 1614 | // extra complexity during GC. We rely on subsequent cache |
| 1615 | // usages (EnsureCapacity) to do this. |
| 1616 | map_cache->ElementsRemoved(existing_elements - used_elements); |
| 1617 | MarkObject(map_cache); |
| 1618 | } |
| 1619 | } |
| 1620 | } |
| 1621 | // Move to next element in the list. |
| 1622 | raw_context = context->get(Context::NEXT_CONTEXT_LINK); |
| 1623 | } |
| 1624 | ProcessMarkingStack(); |
| 1625 | } |
| 1626 | |
| 1627 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1628 | #ifdef DEBUG |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1629 | void MarkCompactCollector::UpdateLiveObjectCount(HeapObject* obj) { |
| 1630 | live_bytes_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1631 | if (heap()->new_space()->Contains(obj)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1632 | live_young_objects_size_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1633 | } else if (heap()->map_space()->Contains(obj)) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1634 | ASSERT(obj->IsMap()); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1635 | live_map_objects_size_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1636 | } else if (heap()->cell_space()->Contains(obj)) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1637 | ASSERT(obj->IsJSGlobalPropertyCell()); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1638 | live_cell_objects_size_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1639 | } else if (heap()->old_pointer_space()->Contains(obj)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1640 | live_old_pointer_objects_size_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1641 | } else if (heap()->old_data_space()->Contains(obj)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1642 | live_old_data_objects_size_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1643 | } else if (heap()->code_space()->Contains(obj)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1644 | live_code_objects_size_ += obj->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1645 | } else if (heap()->lo_space()->Contains(obj)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 1646 | live_lo_objects_size_ += obj->Size(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1647 | } else { |
| 1648 | UNREACHABLE(); |
| 1649 | } |
| 1650 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1651 | #endif // DEBUG |
| 1652 | |
| 1653 | |
| 1654 | void MarkCompactCollector::SweepLargeObjectSpace() { |
| 1655 | #ifdef DEBUG |
| 1656 | ASSERT(state_ == MARK_LIVE_OBJECTS); |
| 1657 | state_ = |
| 1658 | compacting_collection_ ? ENCODE_FORWARDING_ADDRESSES : SWEEP_SPACES; |
| 1659 | #endif |
| 1660 | // Deallocate unmarked objects and clear marked bits for marked objects. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1661 | heap()->lo_space()->FreeUnmarkedObjects(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1662 | } |
| 1663 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1664 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1665 | // Safe to use during marking phase only. |
| 1666 | bool MarkCompactCollector::SafeIsMap(HeapObject* object) { |
| 1667 | MapWord metamap = object->map_word(); |
| 1668 | metamap.ClearMark(); |
| 1669 | return metamap.ToMap()->instance_type() == MAP_TYPE; |
| 1670 | } |
| 1671 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 1672 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1673 | void MarkCompactCollector::ClearNonLiveTransitions() { |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1674 | HeapObjectIterator map_iterator(heap()->map_space(), &SizeOfMarkedObject); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1675 | // Iterate over the map space, setting map transitions that go from |
| 1676 | // a marked map to an unmarked map to null transitions. At the same time, |
| 1677 | // set all the prototype fields of maps back to their original value, |
| 1678 | // dropping the back pointers temporarily stored in the prototype field. |
| 1679 | // Setting the prototype field requires following the linked list of |
| 1680 | // back pointers, reversing them all at once. This allows us to find |
| 1681 | // those maps with map transitions that need to be nulled, and only |
| 1682 | // scan the descriptor arrays of those maps, not all maps. |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 1683 | // All of these actions are carried out only on maps of JSObjects |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1684 | // and related subtypes. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 1685 | for (HeapObject* obj = map_iterator.next(); |
| 1686 | obj != NULL; obj = map_iterator.next()) { |
| 1687 | Map* map = reinterpret_cast<Map*>(obj); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1688 | if (!map->IsMarked() && map->IsByteArray()) continue; |
| 1689 | |
| 1690 | ASSERT(SafeIsMap(map)); |
| 1691 | // Only JSObject and subtypes have map transitions and back pointers. |
ricow@chromium.org | d2be901 | 2011-06-01 06:00:58 +0000 | [diff] [blame] | 1692 | STATIC_ASSERT(LAST_TYPE == LAST_CALLABLE_SPEC_OBJECT_TYPE); |
| 1693 | if (map->instance_type() < FIRST_JS_RECEIVER_TYPE) continue; |
whesse@chromium.org | 4a1fe7d | 2010-09-27 12:32:04 +0000 | [diff] [blame] | 1694 | |
| 1695 | if (map->IsMarked() && map->attached_to_shared_function_info()) { |
| 1696 | // This map is used for inobject slack tracking and has been detached |
| 1697 | // from SharedFunctionInfo during the mark phase. |
| 1698 | // Since it survived the GC, reattach it now. |
| 1699 | map->unchecked_constructor()->unchecked_shared()->AttachInitialMap(map); |
| 1700 | } |
| 1701 | |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1702 | // Clear dead prototype transitions. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1703 | int number_of_transitions = map->NumberOfProtoTransitions(); |
whesse@chromium.org | 37f4447 | 2011-07-13 14:21:21 +0000 | [diff] [blame] | 1704 | if (number_of_transitions > 0) { |
| 1705 | FixedArray* prototype_transitions = |
| 1706 | map->unchecked_prototype_transitions(); |
| 1707 | int new_number_of_transitions = 0; |
| 1708 | const int header = Map::kProtoTransitionHeaderSize; |
| 1709 | const int proto_offset = |
| 1710 | header + Map::kProtoTransitionPrototypeOffset; |
| 1711 | const int map_offset = header + Map::kProtoTransitionMapOffset; |
| 1712 | const int step = Map::kProtoTransitionElementsPerEntry; |
| 1713 | for (int i = 0; i < number_of_transitions; i++) { |
| 1714 | Object* prototype = prototype_transitions->get(proto_offset + i * step); |
| 1715 | Object* cached_map = prototype_transitions->get(map_offset + i * step); |
| 1716 | if (HeapObject::cast(prototype)->IsMarked() && |
| 1717 | HeapObject::cast(cached_map)->IsMarked()) { |
| 1718 | if (new_number_of_transitions != i) { |
| 1719 | prototype_transitions->set_unchecked( |
| 1720 | heap_, |
| 1721 | proto_offset + new_number_of_transitions * step, |
| 1722 | prototype, |
| 1723 | UPDATE_WRITE_BARRIER); |
| 1724 | prototype_transitions->set_unchecked( |
| 1725 | heap_, |
| 1726 | map_offset + new_number_of_transitions * step, |
| 1727 | cached_map, |
| 1728 | SKIP_WRITE_BARRIER); |
| 1729 | } |
| 1730 | new_number_of_transitions++; |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | // Fill slots that became free with undefined value. |
| 1735 | Object* undefined = heap()->raw_unchecked_undefined_value(); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1736 | for (int i = new_number_of_transitions * step; |
| 1737 | i < number_of_transitions * step; |
| 1738 | i++) { |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1739 | prototype_transitions->set_unchecked(heap_, |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1740 | header + i, |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1741 | undefined, |
| 1742 | SKIP_WRITE_BARRIER); |
| 1743 | } |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 1744 | map->SetNumberOfProtoTransitions(new_number_of_transitions); |
erik.corry@gmail.com | 3847bd5 | 2011-04-27 10:38:56 +0000 | [diff] [blame] | 1745 | } |
| 1746 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1747 | // Follow the chain of back pointers to find the prototype. |
| 1748 | Map* current = map; |
| 1749 | while (SafeIsMap(current)) { |
| 1750 | current = reinterpret_cast<Map*>(current->prototype()); |
| 1751 | ASSERT(current->IsHeapObject()); |
| 1752 | } |
| 1753 | Object* real_prototype = current; |
| 1754 | |
| 1755 | // Follow back pointers, setting them to prototype, |
| 1756 | // clearing map transitions when necessary. |
| 1757 | current = map; |
| 1758 | bool on_dead_path = !current->IsMarked(); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 1759 | Object* next; |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1760 | while (SafeIsMap(current)) { |
| 1761 | next = current->prototype(); |
| 1762 | // There should never be a dead map above a live map. |
| 1763 | ASSERT(on_dead_path || current->IsMarked()); |
| 1764 | |
| 1765 | // A live map above a dead map indicates a dead transition. |
| 1766 | // This test will always be false on the first iteration. |
| 1767 | if (on_dead_path && current->IsMarked()) { |
| 1768 | on_dead_path = false; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1769 | current->ClearNonLiveTransitions(heap(), real_prototype); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1770 | } |
| 1771 | *HeapObject::RawField(current, Map::kPrototypeOffset) = |
| 1772 | real_prototype; |
| 1773 | current = reinterpret_cast<Map*>(next); |
| 1774 | } |
| 1775 | } |
| 1776 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1777 | |
kmillikin@chromium.org | 7c2628c | 2011-08-10 11:27:35 +0000 | [diff] [blame^] | 1778 | |
| 1779 | void MarkCompactCollector::ProcessWeakMaps() { |
| 1780 | Object* weak_map_obj = encountered_weak_maps(); |
| 1781 | while (weak_map_obj != Smi::FromInt(0)) { |
| 1782 | ASSERT(HeapObject::cast(weak_map_obj)->IsMarked()); |
| 1783 | JSWeakMap* weak_map = reinterpret_cast<JSWeakMap*>(weak_map_obj); |
| 1784 | ObjectHashTable* table = weak_map->unchecked_table(); |
| 1785 | for (int i = 0; i < table->Capacity(); i++) { |
| 1786 | if (HeapObject::cast(table->KeyAt(i))->IsMarked()) { |
| 1787 | Object* value = table->get(table->EntryToValueIndex(i)); |
| 1788 | StaticMarkingVisitor::MarkObjectByPointer(heap(), &value); |
| 1789 | table->set_unchecked(heap(), |
| 1790 | table->EntryToValueIndex(i), |
| 1791 | value, |
| 1792 | UPDATE_WRITE_BARRIER); |
| 1793 | } |
| 1794 | } |
| 1795 | weak_map_obj = weak_map->next(); |
| 1796 | } |
| 1797 | } |
| 1798 | |
| 1799 | |
| 1800 | void MarkCompactCollector::ClearWeakMaps() { |
| 1801 | Object* weak_map_obj = encountered_weak_maps(); |
| 1802 | while (weak_map_obj != Smi::FromInt(0)) { |
| 1803 | ASSERT(HeapObject::cast(weak_map_obj)->IsMarked()); |
| 1804 | JSWeakMap* weak_map = reinterpret_cast<JSWeakMap*>(weak_map_obj); |
| 1805 | ObjectHashTable* table = weak_map->unchecked_table(); |
| 1806 | for (int i = 0; i < table->Capacity(); i++) { |
| 1807 | if (!HeapObject::cast(table->KeyAt(i))->IsMarked()) { |
| 1808 | table->RemoveEntry(i, heap()); |
| 1809 | } |
| 1810 | } |
| 1811 | weak_map_obj = weak_map->next(); |
| 1812 | weak_map->set_next(Smi::FromInt(0)); |
| 1813 | } |
| 1814 | set_encountered_weak_maps(Smi::FromInt(0)); |
| 1815 | } |
| 1816 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1817 | // ------------------------------------------------------------------------- |
| 1818 | // Phase 2: Encode forwarding addresses. |
| 1819 | // When compacting, forwarding addresses for objects in old space and map |
| 1820 | // space are encoded in their map pointer word (along with an encoding of |
| 1821 | // their map pointers). |
| 1822 | // |
sgjesse@chromium.org | 846fb74 | 2009-12-18 08:56:33 +0000 | [diff] [blame] | 1823 | // The excact encoding is described in the comments for class MapWord in |
| 1824 | // objects.h. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1825 | // |
| 1826 | // An address range [start, end) can have both live and non-live objects. |
| 1827 | // Maximal non-live regions are marked so they can be skipped on subsequent |
| 1828 | // sweeps of the heap. A distinguished map-pointer encoding is used to mark |
| 1829 | // free regions of one-word size (in which case the next word is the start |
| 1830 | // of a live object). A second distinguished map-pointer encoding is used |
| 1831 | // to mark free regions larger than one word, and the size of the free |
| 1832 | // region (including the first word) is written to the second word of the |
| 1833 | // region. |
| 1834 | // |
| 1835 | // Any valid map page offset must lie in the object area of the page, so map |
| 1836 | // page offsets less than Page::kObjectStartOffset are invalid. We use a |
| 1837 | // pair of distinguished invalid map encodings (for single word and multiple |
| 1838 | // words) to indicate free regions in the page found during computation of |
| 1839 | // forwarding addresses and skipped over in subsequent sweeps. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1840 | |
| 1841 | |
| 1842 | // Encode a free region, defined by the given start address and size, in the |
| 1843 | // first word or two of the region. |
| 1844 | void EncodeFreeRegion(Address free_start, int free_size) { |
| 1845 | ASSERT(free_size >= kIntSize); |
| 1846 | if (free_size == kIntSize) { |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 1847 | Memory::uint32_at(free_start) = MarkCompactCollector::kSingleFreeEncoding; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1848 | } else { |
| 1849 | ASSERT(free_size >= 2 * kIntSize); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 1850 | Memory::uint32_at(free_start) = MarkCompactCollector::kMultiFreeEncoding; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1851 | Memory::int_at(free_start + kIntSize) = free_size; |
| 1852 | } |
| 1853 | |
| 1854 | #ifdef DEBUG |
| 1855 | // Zap the body of the free region. |
| 1856 | if (FLAG_enable_slow_asserts) { |
| 1857 | for (int offset = 2 * kIntSize; |
| 1858 | offset < free_size; |
| 1859 | offset += kPointerSize) { |
| 1860 | Memory::Address_at(free_start + offset) = kZapValue; |
| 1861 | } |
| 1862 | } |
| 1863 | #endif |
| 1864 | } |
| 1865 | |
| 1866 | |
| 1867 | // Try to promote all objects in new space. Heap numbers and sequential |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1868 | // strings are promoted to the code space, large objects to large object space, |
| 1869 | // and all others to the old space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1870 | inline MaybeObject* MCAllocateFromNewSpace(Heap* heap, |
| 1871 | HeapObject* object, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1872 | int object_size) { |
| 1873 | MaybeObject* forwarded; |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1874 | if (object_size > heap->MaxObjectSizeInPagedSpace()) { |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1875 | forwarded = Failure::Exception(); |
| 1876 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1877 | OldSpace* target_space = heap->TargetSpace(object); |
| 1878 | ASSERT(target_space == heap->old_pointer_space() || |
| 1879 | target_space == heap->old_data_space()); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 1880 | forwarded = target_space->MCAllocateRaw(object_size); |
| 1881 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1882 | Object* result; |
| 1883 | if (!forwarded->ToObject(&result)) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1884 | result = heap->new_space()->MCAllocateRaw(object_size)->ToObjectUnchecked(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1885 | } |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1886 | return result; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1887 | } |
| 1888 | |
| 1889 | |
| 1890 | // Allocation functions for the paged spaces call the space's MCAllocateRaw. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1891 | MUST_USE_RESULT inline MaybeObject* MCAllocateFromOldPointerSpace( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1892 | Heap *heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1893 | HeapObject* ignore, |
| 1894 | int object_size) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1895 | return heap->old_pointer_space()->MCAllocateRaw(object_size); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1896 | } |
| 1897 | |
| 1898 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1899 | MUST_USE_RESULT inline MaybeObject* MCAllocateFromOldDataSpace( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1900 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1901 | HeapObject* ignore, |
| 1902 | int object_size) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1903 | return heap->old_data_space()->MCAllocateRaw(object_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1904 | } |
| 1905 | |
| 1906 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1907 | MUST_USE_RESULT inline MaybeObject* MCAllocateFromCodeSpace( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1908 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1909 | HeapObject* ignore, |
| 1910 | int object_size) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1911 | return heap->code_space()->MCAllocateRaw(object_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1912 | } |
| 1913 | |
| 1914 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1915 | MUST_USE_RESULT inline MaybeObject* MCAllocateFromMapSpace( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1916 | Heap* heap, |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1917 | HeapObject* ignore, |
| 1918 | int object_size) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1919 | return heap->map_space()->MCAllocateRaw(object_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1920 | } |
| 1921 | |
| 1922 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1923 | MUST_USE_RESULT inline MaybeObject* MCAllocateFromCellSpace( |
| 1924 | Heap* heap, HeapObject* ignore, int object_size) { |
| 1925 | return heap->cell_space()->MCAllocateRaw(object_size); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1926 | } |
| 1927 | |
| 1928 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1929 | // The forwarding address is encoded at the same offset as the current |
| 1930 | // to-space object, but in from space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1931 | inline void EncodeForwardingAddressInNewSpace(Heap* heap, |
| 1932 | HeapObject* old_object, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1933 | int object_size, |
| 1934 | Object* new_object, |
| 1935 | int* ignored) { |
| 1936 | int offset = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1937 | heap->new_space()->ToSpaceOffsetForAddress(old_object->address()); |
| 1938 | Memory::Address_at(heap->new_space()->FromSpaceLow() + offset) = |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1939 | HeapObject::cast(new_object)->address(); |
| 1940 | } |
| 1941 | |
| 1942 | |
| 1943 | // The forwarding address is encoded in the map pointer of the object as an |
| 1944 | // offset (in terms of live bytes) from the address of the first live object |
| 1945 | // in the page. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1946 | inline void EncodeForwardingAddressInPagedSpace(Heap* heap, |
| 1947 | HeapObject* old_object, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1948 | int object_size, |
| 1949 | Object* new_object, |
| 1950 | int* offset) { |
| 1951 | // Record the forwarding address of the first live object if necessary. |
| 1952 | if (*offset == 0) { |
| 1953 | Page::FromAddress(old_object->address())->mc_first_forwarded = |
| 1954 | HeapObject::cast(new_object)->address(); |
| 1955 | } |
| 1956 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1957 | MapWord encoding = |
| 1958 | MapWord::EncodeAddress(old_object->map()->address(), *offset); |
| 1959 | old_object->set_map_word(encoding); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1960 | *offset += object_size; |
| 1961 | ASSERT(*offset <= Page::kObjectAreaSize); |
| 1962 | } |
| 1963 | |
| 1964 | |
| 1965 | // Most non-live objects are ignored. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 1966 | inline void IgnoreNonLiveObject(HeapObject* object, Isolate* isolate) {} |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1967 | |
| 1968 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1969 | // Function template that, given a range of addresses (eg, a semispace or a |
| 1970 | // paged space page), iterates through the objects in the range to clear |
| 1971 | // mark bits and compute and encode forwarding addresses. As a side effect, |
| 1972 | // maximal free chunks are marked so that they can be skipped on subsequent |
| 1973 | // sweeps. |
| 1974 | // |
| 1975 | // The template parameters are an allocation function, a forwarding address |
| 1976 | // encoding function, and a function to process non-live objects. |
| 1977 | template<MarkCompactCollector::AllocationFunction Alloc, |
| 1978 | MarkCompactCollector::EncodingFunction Encode, |
| 1979 | MarkCompactCollector::ProcessNonLiveFunction ProcessNonLive> |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1980 | inline void EncodeForwardingAddressesInRange(MarkCompactCollector* collector, |
| 1981 | Address start, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1982 | Address end, |
| 1983 | int* offset) { |
| 1984 | // The start address of the current free region while sweeping the space. |
| 1985 | // This address is set when a transition from live to non-live objects is |
| 1986 | // encountered. A value (an encoding of the 'next free region' pointer) |
| 1987 | // is written to memory at this address when a transition from non-live to |
| 1988 | // live objects is encountered. |
| 1989 | Address free_start = NULL; |
| 1990 | |
| 1991 | // A flag giving the state of the previously swept object. Initially true |
| 1992 | // to ensure that free_start is initialized to a proper address before |
| 1993 | // trying to write to it. |
| 1994 | bool is_prev_alive = true; |
| 1995 | |
| 1996 | int object_size; // Will be set on each iteration of the loop. |
| 1997 | for (Address current = start; current < end; current += object_size) { |
| 1998 | HeapObject* object = HeapObject::FromAddress(current); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1999 | if (object->IsMarked()) { |
| 2000 | object->ClearMark(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2001 | collector->tracer()->decrement_marked_count(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2002 | object_size = object->Size(); |
| 2003 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2004 | Object* forwarded = |
| 2005 | Alloc(collector->heap(), object, object_size)->ToObjectUnchecked(); |
| 2006 | Encode(collector->heap(), object, object_size, forwarded, offset); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2007 | |
| 2008 | #ifdef DEBUG |
| 2009 | if (FLAG_gc_verbose) { |
| 2010 | PrintF("forward %p -> %p.\n", object->address(), |
| 2011 | HeapObject::cast(forwarded)->address()); |
| 2012 | } |
| 2013 | #endif |
| 2014 | if (!is_prev_alive) { // Transition from non-live to live. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2015 | EncodeFreeRegion(free_start, static_cast<int>(current - free_start)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2016 | is_prev_alive = true; |
| 2017 | } |
| 2018 | } else { // Non-live object. |
| 2019 | object_size = object->Size(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2020 | ProcessNonLive(object, collector->heap()->isolate()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2021 | if (is_prev_alive) { // Transition from live to non-live. |
| 2022 | free_start = current; |
| 2023 | is_prev_alive = false; |
| 2024 | } |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 2025 | LiveObjectList::ProcessNonLive(object); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2026 | } |
| 2027 | } |
| 2028 | |
| 2029 | // If we ended on a free region, mark it. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 2030 | if (!is_prev_alive) { |
| 2031 | EncodeFreeRegion(free_start, static_cast<int>(end - free_start)); |
| 2032 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2033 | } |
| 2034 | |
| 2035 | |
| 2036 | // Functions to encode the forwarding pointers in each compactable space. |
| 2037 | void MarkCompactCollector::EncodeForwardingAddressesInNewSpace() { |
| 2038 | int ignored; |
| 2039 | EncodeForwardingAddressesInRange<MCAllocateFromNewSpace, |
| 2040 | EncodeForwardingAddressInNewSpace, |
| 2041 | IgnoreNonLiveObject>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2042 | this, |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2043 | heap()->new_space()->bottom(), |
| 2044 | heap()->new_space()->top(), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2045 | &ignored); |
| 2046 | } |
| 2047 | |
| 2048 | |
| 2049 | template<MarkCompactCollector::AllocationFunction Alloc, |
| 2050 | MarkCompactCollector::ProcessNonLiveFunction ProcessNonLive> |
| 2051 | void MarkCompactCollector::EncodeForwardingAddressesInPagedSpace( |
| 2052 | PagedSpace* space) { |
| 2053 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 2054 | while (it.has_next()) { |
| 2055 | Page* p = it.next(); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2056 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2057 | // The offset of each live object in the page from the first live object |
| 2058 | // in the page. |
| 2059 | int offset = 0; |
| 2060 | EncodeForwardingAddressesInRange<Alloc, |
| 2061 | EncodeForwardingAddressInPagedSpace, |
| 2062 | ProcessNonLive>( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2063 | this, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2064 | p->ObjectAreaStart(), |
| 2065 | p->AllocationTop(), |
| 2066 | &offset); |
| 2067 | } |
| 2068 | } |
| 2069 | |
| 2070 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2071 | // We scavange new space simultaneously with sweeping. This is done in two |
| 2072 | // passes. |
| 2073 | // The first pass migrates all alive objects from one semispace to another or |
| 2074 | // promotes them to old space. Forwading address is written directly into |
| 2075 | // first word of object without any encoding. If object is dead we are writing |
| 2076 | // NULL as a forwarding address. |
| 2077 | // The second pass updates pointers to new space in all spaces. It is possible |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2078 | // to encounter pointers to dead objects during traversal of dirty regions we |
| 2079 | // should clear them to avoid encountering them during next dirty regions |
| 2080 | // iteration. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2081 | static void MigrateObject(Heap* heap, |
| 2082 | Address dst, |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2083 | Address src, |
| 2084 | int size, |
| 2085 | bool to_old_space) { |
| 2086 | if (to_old_space) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2087 | heap->CopyBlockToOldSpaceAndUpdateRegionMarks(dst, src, size); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2088 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2089 | heap->CopyBlock(dst, src, size); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2090 | } |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2091 | |
| 2092 | Memory::Address_at(src) = dst; |
| 2093 | } |
| 2094 | |
| 2095 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2096 | class StaticPointersToNewGenUpdatingVisitor : public |
| 2097 | StaticNewSpaceVisitor<StaticPointersToNewGenUpdatingVisitor> { |
| 2098 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2099 | static inline void VisitPointer(Heap* heap, Object** p) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2100 | if (!(*p)->IsHeapObject()) return; |
| 2101 | |
| 2102 | HeapObject* obj = HeapObject::cast(*p); |
| 2103 | Address old_addr = obj->address(); |
| 2104 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2105 | if (heap->new_space()->Contains(obj)) { |
| 2106 | ASSERT(heap->InFromSpace(*p)); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2107 | *p = HeapObject::FromAddress(Memory::Address_at(old_addr)); |
| 2108 | } |
| 2109 | } |
| 2110 | }; |
| 2111 | |
| 2112 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2113 | // Visitor for updating pointers from live objects in old spaces to new space. |
| 2114 | // It does not expect to encounter pointers to dead objects. |
| 2115 | class PointersToNewGenUpdatingVisitor: public ObjectVisitor { |
| 2116 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2117 | explicit PointersToNewGenUpdatingVisitor(Heap* heap) : heap_(heap) { } |
| 2118 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2119 | void VisitPointer(Object** p) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2120 | StaticPointersToNewGenUpdatingVisitor::VisitPointer(heap_, p); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2121 | } |
| 2122 | |
| 2123 | void VisitPointers(Object** start, Object** end) { |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2124 | for (Object** p = start; p < end; p++) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2125 | StaticPointersToNewGenUpdatingVisitor::VisitPointer(heap_, p); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2126 | } |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2127 | } |
| 2128 | |
| 2129 | void VisitCodeTarget(RelocInfo* rinfo) { |
| 2130 | ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode())); |
| 2131 | Object* target = Code::GetCodeFromTargetAddress(rinfo->target_address()); |
| 2132 | VisitPointer(&target); |
| 2133 | rinfo->set_target_address(Code::cast(target)->instruction_start()); |
| 2134 | } |
| 2135 | |
| 2136 | void VisitDebugTarget(RelocInfo* rinfo) { |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2137 | ASSERT((RelocInfo::IsJSReturn(rinfo->rmode()) && |
| 2138 | rinfo->IsPatchedReturnSequence()) || |
| 2139 | (RelocInfo::IsDebugBreakSlot(rinfo->rmode()) && |
| 2140 | rinfo->IsPatchedDebugBreakSlotSequence())); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2141 | Object* target = Code::GetCodeFromTargetAddress(rinfo->call_address()); |
| 2142 | VisitPointer(&target); |
| 2143 | rinfo->set_call_address(Code::cast(target)->instruction_start()); |
| 2144 | } |
jkummerow@chromium.org | e297f59 | 2011-06-08 10:05:15 +0000 | [diff] [blame] | 2145 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2146 | private: |
| 2147 | Heap* heap_; |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2148 | }; |
| 2149 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2150 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2151 | // Visitor for updating pointers from live objects in old spaces to new space. |
| 2152 | // It can encounter pointers to dead objects in new space when traversing map |
| 2153 | // space (see comment for MigrateObject). |
| 2154 | static void UpdatePointerToNewGen(HeapObject** p) { |
| 2155 | if (!(*p)->IsHeapObject()) return; |
| 2156 | |
| 2157 | Address old_addr = (*p)->address(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2158 | ASSERT(HEAP->InFromSpace(*p)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2159 | |
| 2160 | Address new_addr = Memory::Address_at(old_addr); |
| 2161 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2162 | if (new_addr == NULL) { |
| 2163 | // We encountered pointer to a dead object. Clear it so we will |
| 2164 | // not visit it again during next iteration of dirty regions. |
| 2165 | *p = NULL; |
| 2166 | } else { |
| 2167 | *p = HeapObject::FromAddress(new_addr); |
| 2168 | } |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2169 | } |
| 2170 | |
| 2171 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2172 | static String* UpdateNewSpaceReferenceInExternalStringTableEntry(Heap* heap, |
| 2173 | Object** p) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2174 | Address old_addr = HeapObject::cast(*p)->address(); |
| 2175 | Address new_addr = Memory::Address_at(old_addr); |
| 2176 | return String::cast(HeapObject::FromAddress(new_addr)); |
| 2177 | } |
| 2178 | |
| 2179 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2180 | static bool TryPromoteObject(Heap* heap, HeapObject* object, int object_size) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2181 | Object* result; |
| 2182 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2183 | if (object_size > heap->MaxObjectSizeInPagedSpace()) { |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2184 | MaybeObject* maybe_result = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2185 | heap->lo_space()->AllocateRawFixedArray(object_size); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2186 | if (maybe_result->ToObject(&result)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2187 | HeapObject* target = HeapObject::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2188 | MigrateObject(heap, target->address(), object->address(), object_size, |
| 2189 | true); |
| 2190 | heap->mark_compact_collector()->tracer()-> |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 2191 | increment_promoted_objects_size(object_size); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2192 | return true; |
| 2193 | } |
| 2194 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2195 | OldSpace* target_space = heap->TargetSpace(object); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2196 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2197 | ASSERT(target_space == heap->old_pointer_space() || |
| 2198 | target_space == heap->old_data_space()); |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2199 | MaybeObject* maybe_result = target_space->AllocateRaw(object_size); |
| 2200 | if (maybe_result->ToObject(&result)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2201 | HeapObject* target = HeapObject::cast(result); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2202 | MigrateObject(heap, |
| 2203 | target->address(), |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2204 | object->address(), |
| 2205 | object_size, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2206 | target_space == heap->old_pointer_space()); |
| 2207 | heap->mark_compact_collector()->tracer()-> |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 2208 | increment_promoted_objects_size(object_size); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2209 | return true; |
| 2210 | } |
| 2211 | } |
| 2212 | |
| 2213 | return false; |
| 2214 | } |
| 2215 | |
| 2216 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2217 | static void SweepNewSpace(Heap* heap, NewSpace* space) { |
| 2218 | heap->CheckNewSpaceExpansionCriteria(); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2219 | |
| 2220 | Address from_bottom = space->bottom(); |
| 2221 | Address from_top = space->top(); |
| 2222 | |
| 2223 | // Flip the semispaces. After flipping, to space is empty, from space has |
| 2224 | // live objects. |
| 2225 | space->Flip(); |
| 2226 | space->ResetAllocationInfo(); |
| 2227 | |
| 2228 | int size = 0; |
| 2229 | int survivors_size = 0; |
| 2230 | |
| 2231 | // First pass: traverse all objects in inactive semispace, remove marks, |
| 2232 | // migrate live objects and write forwarding addresses. |
| 2233 | for (Address current = from_bottom; current < from_top; current += size) { |
| 2234 | HeapObject* object = HeapObject::FromAddress(current); |
| 2235 | |
| 2236 | if (object->IsMarked()) { |
| 2237 | object->ClearMark(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2238 | heap->mark_compact_collector()->tracer()->decrement_marked_count(); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2239 | |
| 2240 | size = object->Size(); |
| 2241 | survivors_size += size; |
| 2242 | |
lrn@chromium.org | c34f580 | 2010-04-28 12:53:43 +0000 | [diff] [blame] | 2243 | // Aggressively promote young survivors to the old space. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2244 | if (TryPromoteObject(heap, object, size)) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2245 | continue; |
| 2246 | } |
| 2247 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2248 | // Promotion failed. Just migrate object to another semispace. |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2249 | // Allocation cannot fail at this point: semispaces are of equal size. |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 2250 | Object* target = space->AllocateRaw(size)->ToObjectUnchecked(); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2251 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2252 | MigrateObject(heap, |
| 2253 | HeapObject::cast(target)->address(), |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2254 | current, |
| 2255 | size, |
| 2256 | false); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2257 | } else { |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 2258 | // Process the dead object before we write a NULL into its header. |
| 2259 | LiveObjectList::ProcessNonLive(object); |
| 2260 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2261 | size = object->Size(); |
| 2262 | Memory::Address_at(current) = NULL; |
| 2263 | } |
| 2264 | } |
| 2265 | |
| 2266 | // Second pass: find pointers to new space and update them. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2267 | PointersToNewGenUpdatingVisitor updating_visitor(heap); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2268 | |
| 2269 | // Update pointers in to space. |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2270 | Address current = space->bottom(); |
| 2271 | while (current < space->top()) { |
| 2272 | HeapObject* object = HeapObject::FromAddress(current); |
| 2273 | current += |
| 2274 | StaticPointersToNewGenUpdatingVisitor::IterateBody(object->map(), |
| 2275 | object); |
lrn@chromium.org | 25156de | 2010-04-06 13:10:27 +0000 | [diff] [blame] | 2276 | } |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2277 | |
| 2278 | // Update roots. |
kmillikin@chromium.org | c53e10d | 2011-05-18 09:12:58 +0000 | [diff] [blame] | 2279 | heap->IterateRoots(&updating_visitor, VISIT_ALL_IN_SWEEP_NEWSPACE); |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 2280 | LiveObjectList::IterateElements(&updating_visitor); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2281 | |
| 2282 | // Update pointers in old spaces. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2283 | heap->IterateDirtyRegions(heap->old_pointer_space(), |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2284 | &Heap::IteratePointersInDirtyRegion, |
| 2285 | &UpdatePointerToNewGen, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2286 | heap->WATERMARK_SHOULD_BE_VALID); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2287 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2288 | heap->lo_space()->IterateDirtyRegions(&UpdatePointerToNewGen); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2289 | |
| 2290 | // Update pointers from cells. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2291 | HeapObjectIterator cell_iterator(heap->cell_space()); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2292 | for (HeapObject* cell = cell_iterator.next(); |
| 2293 | cell != NULL; |
| 2294 | cell = cell_iterator.next()) { |
| 2295 | if (cell->IsJSGlobalPropertyCell()) { |
| 2296 | Address value_address = |
| 2297 | reinterpret_cast<Address>(cell) + |
| 2298 | (JSGlobalPropertyCell::kValueOffset - kHeapObjectTag); |
| 2299 | updating_visitor.VisitPointer(reinterpret_cast<Object**>(value_address)); |
| 2300 | } |
| 2301 | } |
| 2302 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 2303 | // Update pointer from the global contexts list. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2304 | updating_visitor.VisitPointer(heap->global_contexts_list_address()); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 2305 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2306 | // Update pointers from external string table. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2307 | heap->UpdateNewSpaceReferencesInExternalStringTable( |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2308 | &UpdateNewSpaceReferenceInExternalStringTableEntry); |
| 2309 | |
| 2310 | // All pointers were updated. Update auxiliary allocation info. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2311 | heap->IncrementYoungSurvivorsCounter(survivors_size); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2312 | space->set_age_mark(space->top()); |
ager@chromium.org | 9ee27ae | 2011-03-02 13:43:26 +0000 | [diff] [blame] | 2313 | |
| 2314 | // Update JSFunction pointers from the runtime profiler. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2315 | heap->isolate()->runtime_profiler()->UpdateSamplesAfterScavenge(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2316 | } |
| 2317 | |
| 2318 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2319 | static void SweepSpace(Heap* heap, PagedSpace* space) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2320 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2321 | |
| 2322 | // During sweeping of paged space we are trying to find longest sequences |
| 2323 | // of pages without live objects and free them (instead of putting them on |
| 2324 | // the free list). |
| 2325 | |
| 2326 | // Page preceding current. |
| 2327 | Page* prev = Page::FromAddress(NULL); |
| 2328 | |
| 2329 | // First empty page in a sequence. |
| 2330 | Page* first_empty_page = Page::FromAddress(NULL); |
| 2331 | |
| 2332 | // Page preceding first empty page. |
| 2333 | Page* prec_first_empty_page = Page::FromAddress(NULL); |
| 2334 | |
| 2335 | // If last used page of space ends with a sequence of dead objects |
| 2336 | // we can adjust allocation top instead of puting this free area into |
| 2337 | // the free list. Thus during sweeping we keep track of such areas |
| 2338 | // and defer their deallocation until the sweeping of the next page |
| 2339 | // is done: if one of the next pages contains live objects we have |
| 2340 | // to put such area into the free list. |
| 2341 | Address last_free_start = NULL; |
| 2342 | int last_free_size = 0; |
| 2343 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2344 | while (it.has_next()) { |
| 2345 | Page* p = it.next(); |
| 2346 | |
| 2347 | bool is_previous_alive = true; |
| 2348 | Address free_start = NULL; |
| 2349 | HeapObject* object; |
| 2350 | |
| 2351 | for (Address current = p->ObjectAreaStart(); |
| 2352 | current < p->AllocationTop(); |
| 2353 | current += object->Size()) { |
| 2354 | object = HeapObject::FromAddress(current); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2355 | if (object->IsMarked()) { |
| 2356 | object->ClearMark(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2357 | heap->mark_compact_collector()->tracer()->decrement_marked_count(); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2358 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2359 | if (!is_previous_alive) { // Transition from free to live. |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 2360 | space->DeallocateBlock(free_start, |
| 2361 | static_cast<int>(current - free_start), |
| 2362 | true); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2363 | is_previous_alive = true; |
| 2364 | } |
| 2365 | } else { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2366 | heap->mark_compact_collector()->ReportDeleteIfNeeded( |
| 2367 | object, heap->isolate()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2368 | if (is_previous_alive) { // Transition from live to free. |
| 2369 | free_start = current; |
| 2370 | is_previous_alive = false; |
| 2371 | } |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 2372 | LiveObjectList::ProcessNonLive(object); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2373 | } |
| 2374 | // The object is now unmarked for the call to Size() at the top of the |
| 2375 | // loop. |
| 2376 | } |
| 2377 | |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2378 | bool page_is_empty = (p->ObjectAreaStart() == p->AllocationTop()) |
| 2379 | || (!is_previous_alive && free_start == p->ObjectAreaStart()); |
| 2380 | |
| 2381 | if (page_is_empty) { |
| 2382 | // This page is empty. Check whether we are in the middle of |
| 2383 | // sequence of empty pages and start one if not. |
| 2384 | if (!first_empty_page->is_valid()) { |
| 2385 | first_empty_page = p; |
| 2386 | prec_first_empty_page = prev; |
| 2387 | } |
| 2388 | |
| 2389 | if (!is_previous_alive) { |
| 2390 | // There are dead objects on this page. Update space accounting stats |
| 2391 | // without putting anything into free list. |
| 2392 | int size_in_bytes = static_cast<int>(p->AllocationTop() - free_start); |
| 2393 | if (size_in_bytes > 0) { |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 2394 | space->DeallocateBlock(free_start, size_in_bytes, false); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2395 | } |
| 2396 | } |
| 2397 | } else { |
| 2398 | // This page is not empty. Sequence of empty pages ended on the previous |
| 2399 | // one. |
| 2400 | if (first_empty_page->is_valid()) { |
| 2401 | space->FreePages(prec_first_empty_page, prev); |
| 2402 | prec_first_empty_page = first_empty_page = Page::FromAddress(NULL); |
| 2403 | } |
| 2404 | |
| 2405 | // If there is a free ending area on one of the previous pages we have |
| 2406 | // deallocate that area and put it on the free list. |
| 2407 | if (last_free_size > 0) { |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2408 | Page::FromAddress(last_free_start)-> |
| 2409 | SetAllocationWatermark(last_free_start); |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 2410 | space->DeallocateBlock(last_free_start, last_free_size, true); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2411 | last_free_start = NULL; |
| 2412 | last_free_size = 0; |
| 2413 | } |
| 2414 | |
| 2415 | // If the last region of this page was not live we remember it. |
| 2416 | if (!is_previous_alive) { |
| 2417 | ASSERT(last_free_size == 0); |
| 2418 | last_free_size = static_cast<int>(p->AllocationTop() - free_start); |
| 2419 | last_free_start = free_start; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2420 | } |
| 2421 | } |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2422 | |
| 2423 | prev = p; |
| 2424 | } |
| 2425 | |
| 2426 | // We reached end of space. See if we need to adjust allocation top. |
| 2427 | Address new_allocation_top = NULL; |
| 2428 | |
| 2429 | if (first_empty_page->is_valid()) { |
| 2430 | // Last used pages in space are empty. We can move allocation top backwards |
| 2431 | // to the beginning of first empty page. |
| 2432 | ASSERT(prev == space->AllocationTopPage()); |
| 2433 | |
| 2434 | new_allocation_top = first_empty_page->ObjectAreaStart(); |
| 2435 | } |
| 2436 | |
| 2437 | if (last_free_size > 0) { |
| 2438 | // There was a free ending area on the previous page. |
| 2439 | // Deallocate it without putting it into freelist and move allocation |
| 2440 | // top to the beginning of this free area. |
ricow@chromium.org | d236f4d | 2010-09-01 06:52:08 +0000 | [diff] [blame] | 2441 | space->DeallocateBlock(last_free_start, last_free_size, false); |
fschneider@chromium.org | 013f3e1 | 2010-04-26 13:27:52 +0000 | [diff] [blame] | 2442 | new_allocation_top = last_free_start; |
| 2443 | } |
| 2444 | |
| 2445 | if (new_allocation_top != NULL) { |
| 2446 | #ifdef DEBUG |
| 2447 | Page* new_allocation_top_page = Page::FromAllocationTop(new_allocation_top); |
| 2448 | if (!first_empty_page->is_valid()) { |
| 2449 | ASSERT(new_allocation_top_page == space->AllocationTopPage()); |
| 2450 | } else if (last_free_size > 0) { |
| 2451 | ASSERT(new_allocation_top_page == prec_first_empty_page); |
| 2452 | } else { |
| 2453 | ASSERT(new_allocation_top_page == first_empty_page); |
| 2454 | } |
| 2455 | #endif |
| 2456 | |
| 2457 | space->SetTop(new_allocation_top); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2458 | } |
| 2459 | } |
| 2460 | |
| 2461 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2462 | void MarkCompactCollector::EncodeForwardingAddresses() { |
| 2463 | ASSERT(state_ == ENCODE_FORWARDING_ADDRESSES); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2464 | // Objects in the active semispace of the young generation may be |
| 2465 | // relocated to the inactive semispace (if not promoted). Set the |
| 2466 | // relocation info to the beginning of the inactive semispace. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2467 | heap()->new_space()->MCResetRelocationInfo(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2468 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2469 | // Compute the forwarding pointers in each space. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2470 | EncodeForwardingAddressesInPagedSpace<MCAllocateFromOldPointerSpace, |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2471 | ReportDeleteIfNeeded>( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2472 | heap()->old_pointer_space()); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2473 | |
| 2474 | EncodeForwardingAddressesInPagedSpace<MCAllocateFromOldDataSpace, |
| 2475 | IgnoreNonLiveObject>( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2476 | heap()->old_data_space()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2477 | |
| 2478 | EncodeForwardingAddressesInPagedSpace<MCAllocateFromCodeSpace, |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2479 | ReportDeleteIfNeeded>( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2480 | heap()->code_space()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2481 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2482 | EncodeForwardingAddressesInPagedSpace<MCAllocateFromCellSpace, |
| 2483 | IgnoreNonLiveObject>( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2484 | heap()->cell_space()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2485 | |
| 2486 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2487 | // Compute new space next to last after the old and code spaces have been |
| 2488 | // compacted. Objects in new space can be promoted to old or code space. |
| 2489 | EncodeForwardingAddressesInNewSpace(); |
| 2490 | |
| 2491 | // Compute map space last because computing forwarding addresses |
| 2492 | // overwrites non-live objects. Objects in the other spaces rely on |
| 2493 | // non-live map pointers to get the sizes of non-live objects. |
| 2494 | EncodeForwardingAddressesInPagedSpace<MCAllocateFromMapSpace, |
| 2495 | IgnoreNonLiveObject>( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2496 | heap()->map_space()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2497 | |
| 2498 | // Write relocation info to the top page, so we can use it later. This is |
| 2499 | // done after promoting objects from the new space so we get the correct |
| 2500 | // allocation top. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2501 | heap()->old_pointer_space()->MCWriteRelocationInfoToPage(); |
| 2502 | heap()->old_data_space()->MCWriteRelocationInfoToPage(); |
| 2503 | heap()->code_space()->MCWriteRelocationInfoToPage(); |
| 2504 | heap()->map_space()->MCWriteRelocationInfoToPage(); |
| 2505 | heap()->cell_space()->MCWriteRelocationInfoToPage(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2506 | } |
| 2507 | |
| 2508 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2509 | class MapIterator : public HeapObjectIterator { |
| 2510 | public: |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2511 | explicit MapIterator(Heap* heap) |
| 2512 | : HeapObjectIterator(heap->map_space(), &SizeCallback) { } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2513 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2514 | MapIterator(Heap* heap, Address start) |
| 2515 | : HeapObjectIterator(heap->map_space(), start, &SizeCallback) { } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2516 | |
| 2517 | private: |
| 2518 | static int SizeCallback(HeapObject* unused) { |
| 2519 | USE(unused); |
| 2520 | return Map::kSize; |
| 2521 | } |
| 2522 | }; |
| 2523 | |
| 2524 | |
| 2525 | class MapCompact { |
| 2526 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2527 | explicit MapCompact(Heap* heap, int live_maps) |
| 2528 | : heap_(heap), |
| 2529 | live_maps_(live_maps), |
| 2530 | to_evacuate_start_(heap->map_space()->TopAfterCompaction(live_maps)), |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2531 | vacant_map_it_(heap), |
| 2532 | map_to_evacuate_it_(heap, to_evacuate_start_), |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2533 | first_map_to_evacuate_( |
| 2534 | reinterpret_cast<Map*>(HeapObject::FromAddress(to_evacuate_start_))) { |
| 2535 | } |
| 2536 | |
| 2537 | void CompactMaps() { |
| 2538 | // As we know the number of maps to evacuate beforehand, |
| 2539 | // we stop then there is no more vacant maps. |
| 2540 | for (Map* next_vacant_map = NextVacantMap(); |
| 2541 | next_vacant_map; |
| 2542 | next_vacant_map = NextVacantMap()) { |
| 2543 | EvacuateMap(next_vacant_map, NextMapToEvacuate()); |
| 2544 | } |
| 2545 | |
| 2546 | #ifdef DEBUG |
| 2547 | CheckNoMapsToEvacuate(); |
| 2548 | #endif |
| 2549 | } |
| 2550 | |
| 2551 | void UpdateMapPointersInRoots() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2552 | MapUpdatingVisitor map_updating_visitor; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2553 | heap()->IterateRoots(&map_updating_visitor, VISIT_ONLY_STRONG); |
| 2554 | heap()->isolate()->global_handles()->IterateWeakRoots( |
| 2555 | &map_updating_visitor); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2556 | LiveObjectList::IterateElements(&map_updating_visitor); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2557 | } |
| 2558 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2559 | void UpdateMapPointersInPagedSpace(PagedSpace* space) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2560 | ASSERT(space != heap()->map_space()); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2561 | |
| 2562 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 2563 | while (it.has_next()) { |
| 2564 | Page* p = it.next(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2565 | UpdateMapPointersInRange(heap(), |
| 2566 | p->ObjectAreaStart(), |
| 2567 | p->AllocationTop()); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2568 | } |
| 2569 | } |
| 2570 | |
| 2571 | void UpdateMapPointersInNewSpace() { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2572 | NewSpace* space = heap()->new_space(); |
| 2573 | UpdateMapPointersInRange(heap(), space->bottom(), space->top()); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2574 | } |
| 2575 | |
| 2576 | void UpdateMapPointersInLargeObjectSpace() { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2577 | LargeObjectIterator it(heap()->lo_space()); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2578 | for (HeapObject* obj = it.next(); obj != NULL; obj = it.next()) |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2579 | UpdateMapPointersInObject(heap(), obj); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2580 | } |
| 2581 | |
| 2582 | void Finish() { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2583 | heap()->map_space()->FinishCompaction(to_evacuate_start_, live_maps_); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2584 | } |
| 2585 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2586 | inline Heap* heap() const { return heap_; } |
| 2587 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2588 | private: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2589 | Heap* heap_; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2590 | int live_maps_; |
| 2591 | Address to_evacuate_start_; |
| 2592 | MapIterator vacant_map_it_; |
| 2593 | MapIterator map_to_evacuate_it_; |
| 2594 | Map* first_map_to_evacuate_; |
| 2595 | |
| 2596 | // Helper class for updating map pointers in HeapObjects. |
| 2597 | class MapUpdatingVisitor: public ObjectVisitor { |
| 2598 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2599 | MapUpdatingVisitor() {} |
| 2600 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2601 | void VisitPointer(Object** p) { |
| 2602 | UpdateMapPointer(p); |
| 2603 | } |
| 2604 | |
| 2605 | void VisitPointers(Object** start, Object** end) { |
| 2606 | for (Object** p = start; p < end; p++) UpdateMapPointer(p); |
| 2607 | } |
| 2608 | |
| 2609 | private: |
| 2610 | void UpdateMapPointer(Object** p) { |
| 2611 | if (!(*p)->IsHeapObject()) return; |
| 2612 | HeapObject* old_map = reinterpret_cast<HeapObject*>(*p); |
| 2613 | |
| 2614 | // Moved maps are tagged with overflowed map word. They are the only |
| 2615 | // objects those map word is overflowed as marking is already complete. |
| 2616 | MapWord map_word = old_map->map_word(); |
| 2617 | if (!map_word.IsOverflowed()) return; |
| 2618 | |
| 2619 | *p = GetForwardedMap(map_word); |
| 2620 | } |
| 2621 | }; |
| 2622 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2623 | static Map* NextMap(MapIterator* it, HeapObject* last, bool live) { |
| 2624 | while (true) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2625 | HeapObject* next = it->next(); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2626 | ASSERT(next != NULL); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2627 | if (next == last) |
| 2628 | return NULL; |
| 2629 | ASSERT(!next->IsOverflowed()); |
| 2630 | ASSERT(!next->IsMarked()); |
| 2631 | ASSERT(next->IsMap() || FreeListNode::IsFreeListNode(next)); |
| 2632 | if (next->IsMap() == live) |
| 2633 | return reinterpret_cast<Map*>(next); |
| 2634 | } |
| 2635 | } |
| 2636 | |
| 2637 | Map* NextVacantMap() { |
| 2638 | Map* map = NextMap(&vacant_map_it_, first_map_to_evacuate_, false); |
| 2639 | ASSERT(map == NULL || FreeListNode::IsFreeListNode(map)); |
| 2640 | return map; |
| 2641 | } |
| 2642 | |
| 2643 | Map* NextMapToEvacuate() { |
| 2644 | Map* map = NextMap(&map_to_evacuate_it_, NULL, true); |
| 2645 | ASSERT(map != NULL); |
| 2646 | ASSERT(map->IsMap()); |
| 2647 | return map; |
| 2648 | } |
| 2649 | |
| 2650 | static void EvacuateMap(Map* vacant_map, Map* map_to_evacuate) { |
| 2651 | ASSERT(FreeListNode::IsFreeListNode(vacant_map)); |
| 2652 | ASSERT(map_to_evacuate->IsMap()); |
| 2653 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2654 | ASSERT(Map::kSize % 4 == 0); |
| 2655 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2656 | map_to_evacuate->heap()->CopyBlockToOldSpaceAndUpdateRegionMarks( |
| 2657 | vacant_map->address(), map_to_evacuate->address(), Map::kSize); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2658 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2659 | ASSERT(vacant_map->IsMap()); // Due to memcpy above. |
| 2660 | |
| 2661 | MapWord forwarding_map_word = MapWord::FromMap(vacant_map); |
| 2662 | forwarding_map_word.SetOverflow(); |
| 2663 | map_to_evacuate->set_map_word(forwarding_map_word); |
| 2664 | |
| 2665 | ASSERT(map_to_evacuate->map_word().IsOverflowed()); |
| 2666 | ASSERT(GetForwardedMap(map_to_evacuate->map_word()) == vacant_map); |
| 2667 | } |
| 2668 | |
| 2669 | static Map* GetForwardedMap(MapWord map_word) { |
| 2670 | ASSERT(map_word.IsOverflowed()); |
| 2671 | map_word.ClearOverflow(); |
| 2672 | Map* new_map = map_word.ToMap(); |
| 2673 | ASSERT_MAP_ALIGNED(new_map->address()); |
| 2674 | return new_map; |
| 2675 | } |
| 2676 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2677 | static int UpdateMapPointersInObject(Heap* heap, HeapObject* obj) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2678 | ASSERT(!obj->IsMarked()); |
| 2679 | Map* map = obj->map(); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2680 | ASSERT(heap->map_space()->Contains(map)); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2681 | MapWord map_word = map->map_word(); |
| 2682 | ASSERT(!map_word.IsMarked()); |
| 2683 | if (map_word.IsOverflowed()) { |
| 2684 | Map* new_map = GetForwardedMap(map_word); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2685 | ASSERT(heap->map_space()->Contains(new_map)); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2686 | obj->set_map(new_map); |
| 2687 | |
| 2688 | #ifdef DEBUG |
| 2689 | if (FLAG_gc_verbose) { |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 2690 | PrintF("update %p : %p -> %p\n", |
| 2691 | obj->address(), |
| 2692 | reinterpret_cast<void*>(map), |
| 2693 | reinterpret_cast<void*>(new_map)); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2694 | } |
| 2695 | #endif |
| 2696 | } |
| 2697 | |
| 2698 | int size = obj->SizeFromMap(map); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2699 | MapUpdatingVisitor map_updating_visitor; |
| 2700 | obj->IterateBody(map->instance_type(), size, &map_updating_visitor); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2701 | return size; |
| 2702 | } |
| 2703 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2704 | static void UpdateMapPointersInRange(Heap* heap, Address start, Address end) { |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2705 | HeapObject* object; |
| 2706 | int size; |
| 2707 | for (Address current = start; current < end; current += size) { |
| 2708 | object = HeapObject::FromAddress(current); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2709 | size = UpdateMapPointersInObject(heap, object); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2710 | ASSERT(size > 0); |
| 2711 | } |
| 2712 | } |
| 2713 | |
| 2714 | #ifdef DEBUG |
| 2715 | void CheckNoMapsToEvacuate() { |
| 2716 | if (!FLAG_enable_slow_asserts) |
| 2717 | return; |
| 2718 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2719 | for (HeapObject* obj = map_to_evacuate_it_.next(); |
| 2720 | obj != NULL; obj = map_to_evacuate_it_.next()) |
| 2721 | ASSERT(FreeListNode::IsFreeListNode(obj)); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2722 | } |
| 2723 | #endif |
| 2724 | }; |
| 2725 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2726 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2727 | void MarkCompactCollector::SweepSpaces() { |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 2728 | GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_SWEEP); |
| 2729 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2730 | ASSERT(state_ == SWEEP_SPACES); |
| 2731 | ASSERT(!IsCompacting()); |
| 2732 | // Noncompacting collections simply sweep the spaces to clear the mark |
| 2733 | // bits and free the nonlive blocks (for old and map spaces). We sweep |
| 2734 | // the map space last because freeing non-live maps overwrites them and |
| 2735 | // the other spaces rely on possibly non-live maps to get the sizes for |
| 2736 | // non-live objects. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2737 | SweepSpace(heap(), heap()->old_pointer_space()); |
| 2738 | SweepSpace(heap(), heap()->old_data_space()); |
| 2739 | SweepSpace(heap(), heap()->code_space()); |
| 2740 | SweepSpace(heap(), heap()->cell_space()); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2741 | { GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_SWEEP_NEWSPACE); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2742 | SweepNewSpace(heap(), heap()->new_space()); |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 2743 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2744 | SweepSpace(heap(), heap()->map_space()); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2745 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2746 | heap()->IterateDirtyRegions(heap()->map_space(), |
| 2747 | &heap()->IteratePointersInDirtyMapsRegion, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2748 | &UpdatePointerToNewGen, |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2749 | heap()->WATERMARK_SHOULD_BE_VALID); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 2750 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2751 | intptr_t live_maps_size = heap()->map_space()->Size(); |
kmillikin@chromium.org | f05f291 | 2010-09-30 10:07:24 +0000 | [diff] [blame] | 2752 | int live_maps = static_cast<int>(live_maps_size / Map::kSize); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2753 | ASSERT(live_map_objects_size_ == live_maps_size); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2754 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2755 | if (heap()->map_space()->NeedsCompaction(live_maps)) { |
| 2756 | MapCompact map_compact(heap(), live_maps); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2757 | |
| 2758 | map_compact.CompactMaps(); |
| 2759 | map_compact.UpdateMapPointersInRoots(); |
| 2760 | |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2761 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2762 | for (PagedSpace* space = spaces.next(); |
| 2763 | space != NULL; space = spaces.next()) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2764 | if (space == heap()->map_space()) continue; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 2765 | map_compact.UpdateMapPointersInPagedSpace(space); |
| 2766 | } |
| 2767 | map_compact.UpdateMapPointersInNewSpace(); |
| 2768 | map_compact.UpdateMapPointersInLargeObjectSpace(); |
| 2769 | |
| 2770 | map_compact.Finish(); |
| 2771 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2772 | } |
| 2773 | |
| 2774 | |
| 2775 | // Iterate the live objects in a range of addresses (eg, a page or a |
| 2776 | // semispace). The live regions of the range have been linked into a list. |
| 2777 | // The first live region is [first_live_start, first_live_end), and the last |
| 2778 | // address in the range is top. The callback function is used to get the |
| 2779 | // size of each live object. |
| 2780 | int MarkCompactCollector::IterateLiveObjectsInRange( |
| 2781 | Address start, |
| 2782 | Address end, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2783 | LiveObjectCallback size_func) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2784 | int live_objects_size = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2785 | Address current = start; |
| 2786 | while (current < end) { |
| 2787 | uint32_t encoded_map = Memory::uint32_at(current); |
| 2788 | if (encoded_map == kSingleFreeEncoding) { |
| 2789 | current += kPointerSize; |
| 2790 | } else if (encoded_map == kMultiFreeEncoding) { |
| 2791 | current += Memory::int_at(current + kIntSize); |
| 2792 | } else { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2793 | int size = (this->*size_func)(HeapObject::FromAddress(current)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2794 | current += size; |
| 2795 | live_objects_size += size; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2796 | } |
| 2797 | } |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2798 | return live_objects_size; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2799 | } |
| 2800 | |
| 2801 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2802 | int MarkCompactCollector::IterateLiveObjects( |
| 2803 | NewSpace* space, LiveObjectCallback size_f) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2804 | ASSERT(MARK_LIVE_OBJECTS < state_ && state_ <= RELOCATE_OBJECTS); |
| 2805 | return IterateLiveObjectsInRange(space->bottom(), space->top(), size_f); |
| 2806 | } |
| 2807 | |
| 2808 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2809 | int MarkCompactCollector::IterateLiveObjects( |
| 2810 | PagedSpace* space, LiveObjectCallback size_f) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2811 | ASSERT(MARK_LIVE_OBJECTS < state_ && state_ <= RELOCATE_OBJECTS); |
| 2812 | int total = 0; |
| 2813 | PageIterator it(space, PageIterator::PAGES_IN_USE); |
| 2814 | while (it.has_next()) { |
| 2815 | Page* p = it.next(); |
| 2816 | total += IterateLiveObjectsInRange(p->ObjectAreaStart(), |
| 2817 | p->AllocationTop(), |
| 2818 | size_f); |
| 2819 | } |
| 2820 | return total; |
| 2821 | } |
| 2822 | |
| 2823 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 2824 | // ------------------------------------------------------------------------- |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2825 | // Phase 3: Update pointers |
| 2826 | |
| 2827 | // Helper class for updating pointers in HeapObjects. |
| 2828 | class UpdatingVisitor: public ObjectVisitor { |
| 2829 | public: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2830 | explicit UpdatingVisitor(Heap* heap) : heap_(heap) {} |
| 2831 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2832 | void VisitPointer(Object** p) { |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2833 | UpdatePointer(p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2834 | } |
| 2835 | |
| 2836 | void VisitPointers(Object** start, Object** end) { |
| 2837 | // Mark all HeapObject pointers in [start, end) |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2838 | for (Object** p = start; p < end; p++) UpdatePointer(p); |
| 2839 | } |
| 2840 | |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame] | 2841 | void VisitCodeTarget(RelocInfo* rinfo) { |
| 2842 | ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode())); |
| 2843 | Object* target = Code::GetCodeFromTargetAddress(rinfo->target_address()); |
| 2844 | VisitPointer(&target); |
| 2845 | rinfo->set_target_address( |
| 2846 | reinterpret_cast<Code*>(target)->instruction_start()); |
| 2847 | } |
| 2848 | |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2849 | void VisitDebugTarget(RelocInfo* rinfo) { |
vegorov@chromium.org | 2356e6f | 2010-06-09 09:38:56 +0000 | [diff] [blame] | 2850 | ASSERT((RelocInfo::IsJSReturn(rinfo->rmode()) && |
| 2851 | rinfo->IsPatchedReturnSequence()) || |
| 2852 | (RelocInfo::IsDebugBreakSlot(rinfo->rmode()) && |
| 2853 | rinfo->IsPatchedDebugBreakSlotSequence())); |
sgjesse@chromium.org | c514574 | 2009-10-07 09:00:33 +0000 | [diff] [blame] | 2854 | Object* target = Code::GetCodeFromTargetAddress(rinfo->call_address()); |
| 2855 | VisitPointer(&target); |
| 2856 | rinfo->set_call_address( |
| 2857 | reinterpret_cast<Code*>(target)->instruction_start()); |
| 2858 | } |
| 2859 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2860 | inline Heap* heap() const { return heap_; } |
| 2861 | |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2862 | private: |
| 2863 | void UpdatePointer(Object** p) { |
| 2864 | if (!(*p)->IsHeapObject()) return; |
| 2865 | |
| 2866 | HeapObject* obj = HeapObject::cast(*p); |
| 2867 | Address old_addr = obj->address(); |
| 2868 | Address new_addr; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2869 | ASSERT(!heap()->InFromSpace(obj)); |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2870 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2871 | if (heap()->new_space()->Contains(obj)) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2872 | Address forwarding_pointer_addr = |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2873 | heap()->new_space()->FromSpaceLow() + |
| 2874 | heap()->new_space()->ToSpaceOffsetForAddress(old_addr); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2875 | new_addr = Memory::Address_at(forwarding_pointer_addr); |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2876 | |
| 2877 | #ifdef DEBUG |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2878 | ASSERT(heap()->old_pointer_space()->Contains(new_addr) || |
| 2879 | heap()->old_data_space()->Contains(new_addr) || |
| 2880 | heap()->new_space()->FromSpaceContains(new_addr) || |
| 2881 | heap()->lo_space()->Contains(HeapObject::FromAddress(new_addr))); |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2882 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2883 | if (heap()->new_space()->FromSpaceContains(new_addr)) { |
| 2884 | ASSERT(heap()->new_space()->FromSpaceOffsetForAddress(new_addr) <= |
| 2885 | heap()->new_space()->ToSpaceOffsetForAddress(old_addr)); |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2886 | } |
| 2887 | #endif |
| 2888 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2889 | } else if (heap()->lo_space()->Contains(obj)) { |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2890 | // Don't move objects in the large object space. |
| 2891 | return; |
| 2892 | |
| 2893 | } else { |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2894 | #ifdef DEBUG |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2895 | PagedSpaces spaces; |
| 2896 | PagedSpace* original_space = spaces.next(); |
| 2897 | while (original_space != NULL) { |
| 2898 | if (original_space->Contains(obj)) break; |
| 2899 | original_space = spaces.next(); |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2900 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2901 | ASSERT(original_space != NULL); |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2902 | #endif |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2903 | new_addr = MarkCompactCollector::GetForwardingAddressInOldSpace(obj); |
| 2904 | ASSERT(original_space->Contains(new_addr)); |
| 2905 | ASSERT(original_space->MCSpaceOffsetForAddress(new_addr) <= |
| 2906 | original_space->MCSpaceOffsetForAddress(old_addr)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2907 | } |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2908 | |
| 2909 | *p = HeapObject::FromAddress(new_addr); |
| 2910 | |
| 2911 | #ifdef DEBUG |
| 2912 | if (FLAG_gc_verbose) { |
| 2913 | PrintF("update %p : %p -> %p\n", |
| 2914 | reinterpret_cast<Address>(p), old_addr, new_addr); |
| 2915 | } |
| 2916 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2917 | } |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2918 | |
| 2919 | Heap* heap_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2920 | }; |
| 2921 | |
mads.s.ager | cbaa060 | 2008-08-14 13:41:48 +0000 | [diff] [blame] | 2922 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2923 | void MarkCompactCollector::UpdatePointers() { |
| 2924 | #ifdef DEBUG |
| 2925 | ASSERT(state_ == ENCODE_FORWARDING_ADDRESSES); |
| 2926 | state_ = UPDATE_POINTERS; |
| 2927 | #endif |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2928 | UpdatingVisitor updating_visitor(heap()); |
| 2929 | heap()->isolate()->runtime_profiler()->UpdateSamplesAfterCompact( |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2930 | &updating_visitor); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2931 | heap()->IterateRoots(&updating_visitor, VISIT_ONLY_STRONG); |
| 2932 | heap()->isolate()->global_handles()->IterateWeakRoots(&updating_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2933 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 2934 | // Update the pointer to the head of the weak list of global contexts. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2935 | updating_visitor.VisitPointer(&heap()->global_contexts_list_); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 2936 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 2937 | LiveObjectList::IterateElements(&updating_visitor); |
| 2938 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2939 | int live_maps_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2940 | heap()->map_space(), &MarkCompactCollector::UpdatePointersInOldObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2941 | int live_pointer_olds_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2942 | heap()->old_pointer_space(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2943 | &MarkCompactCollector::UpdatePointersInOldObject); |
| 2944 | int live_data_olds_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2945 | heap()->old_data_space(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2946 | &MarkCompactCollector::UpdatePointersInOldObject); |
| 2947 | int live_codes_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2948 | heap()->code_space(), &MarkCompactCollector::UpdatePointersInOldObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2949 | int live_cells_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2950 | heap()->cell_space(), &MarkCompactCollector::UpdatePointersInOldObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 2951 | int live_news_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2952 | heap()->new_space(), &MarkCompactCollector::UpdatePointersInNewObject); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2953 | |
| 2954 | // Large objects do not move, the map word can be updated directly. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2955 | LargeObjectIterator it(heap()->lo_space()); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2956 | for (HeapObject* obj = it.next(); obj != NULL; obj = it.next()) { |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 2957 | UpdatePointersInNewObject(obj); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2958 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2959 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 2960 | USE(live_maps_size); |
| 2961 | USE(live_pointer_olds_size); |
| 2962 | USE(live_data_olds_size); |
| 2963 | USE(live_codes_size); |
| 2964 | USE(live_cells_size); |
| 2965 | USE(live_news_size); |
| 2966 | ASSERT(live_maps_size == live_map_objects_size_); |
| 2967 | ASSERT(live_data_olds_size == live_old_data_objects_size_); |
| 2968 | ASSERT(live_pointer_olds_size == live_old_pointer_objects_size_); |
| 2969 | ASSERT(live_codes_size == live_code_objects_size_); |
| 2970 | ASSERT(live_cells_size == live_cell_objects_size_); |
| 2971 | ASSERT(live_news_size == live_young_objects_size_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2972 | } |
| 2973 | |
| 2974 | |
| 2975 | int MarkCompactCollector::UpdatePointersInNewObject(HeapObject* obj) { |
| 2976 | // Keep old map pointers |
| 2977 | Map* old_map = obj->map(); |
| 2978 | ASSERT(old_map->IsHeapObject()); |
| 2979 | |
| 2980 | Address forwarded = GetForwardingAddressInOldSpace(old_map); |
| 2981 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2982 | ASSERT(heap()->map_space()->Contains(old_map)); |
| 2983 | ASSERT(heap()->map_space()->Contains(forwarded)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2984 | #ifdef DEBUG |
| 2985 | if (FLAG_gc_verbose) { |
| 2986 | PrintF("update %p : %p -> %p\n", obj->address(), old_map->address(), |
| 2987 | forwarded); |
| 2988 | } |
| 2989 | #endif |
| 2990 | // Update the map pointer. |
| 2991 | obj->set_map(reinterpret_cast<Map*>(HeapObject::FromAddress(forwarded))); |
| 2992 | |
| 2993 | // We have to compute the object size relying on the old map because |
| 2994 | // map objects are not relocated yet. |
| 2995 | int obj_size = obj->SizeFromMap(old_map); |
| 2996 | |
| 2997 | // Update pointers in the object body. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 2998 | UpdatingVisitor updating_visitor(heap()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2999 | obj->IterateBody(old_map->instance_type(), obj_size, &updating_visitor); |
| 3000 | return obj_size; |
| 3001 | } |
| 3002 | |
| 3003 | |
| 3004 | int MarkCompactCollector::UpdatePointersInOldObject(HeapObject* obj) { |
| 3005 | // Decode the map pointer. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 3006 | MapWord encoding = obj->map_word(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3007 | Address map_addr = encoding.DecodeMapAddress(heap()->map_space()); |
| 3008 | ASSERT(heap()->map_space()->Contains(HeapObject::FromAddress(map_addr))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3009 | |
| 3010 | // At this point, the first word of map_addr is also encoded, cannot |
| 3011 | // cast it to Map* using Map::cast. |
| 3012 | Map* map = reinterpret_cast<Map*>(HeapObject::FromAddress(map_addr)); |
| 3013 | int obj_size = obj->SizeFromMap(map); |
| 3014 | InstanceType type = map->instance_type(); |
| 3015 | |
| 3016 | // Update map pointer. |
| 3017 | Address new_map_addr = GetForwardingAddressInOldSpace(map); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 3018 | int offset = encoding.DecodeOffset(); |
| 3019 | obj->set_map_word(MapWord::EncodeAddress(new_map_addr, offset)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3020 | |
| 3021 | #ifdef DEBUG |
| 3022 | if (FLAG_gc_verbose) { |
| 3023 | PrintF("update %p : %p -> %p\n", obj->address(), |
| 3024 | map_addr, new_map_addr); |
| 3025 | } |
| 3026 | #endif |
| 3027 | |
| 3028 | // Update pointers in the object body. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3029 | UpdatingVisitor updating_visitor(heap()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3030 | obj->IterateBody(type, obj_size, &updating_visitor); |
| 3031 | return obj_size; |
| 3032 | } |
| 3033 | |
| 3034 | |
| 3035 | Address MarkCompactCollector::GetForwardingAddressInOldSpace(HeapObject* obj) { |
| 3036 | // Object should either in old or map space. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 3037 | MapWord encoding = obj->map_word(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3038 | |
| 3039 | // Offset to the first live object's forwarding address. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 3040 | int offset = encoding.DecodeOffset(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3041 | Address obj_addr = obj->address(); |
| 3042 | |
| 3043 | // Find the first live object's forwarding address. |
| 3044 | Page* p = Page::FromAddress(obj_addr); |
| 3045 | Address first_forwarded = p->mc_first_forwarded; |
| 3046 | |
| 3047 | // Page start address of forwarded address. |
| 3048 | Page* forwarded_page = Page::FromAddress(first_forwarded); |
| 3049 | int forwarded_offset = forwarded_page->Offset(first_forwarded); |
| 3050 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3051 | // Find end of allocation in the page of first_forwarded. |
| 3052 | int mc_top_offset = forwarded_page->AllocationWatermarkOffset(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3053 | |
| 3054 | // Check if current object's forward pointer is in the same page |
| 3055 | // as the first live object's forwarding pointer |
| 3056 | if (forwarded_offset + offset < mc_top_offset) { |
| 3057 | // In the same page. |
| 3058 | return first_forwarded + offset; |
| 3059 | } |
| 3060 | |
| 3061 | // Must be in the next page, NOTE: this may cross chunks. |
| 3062 | Page* next_page = forwarded_page->next_page(); |
| 3063 | ASSERT(next_page->is_valid()); |
| 3064 | |
| 3065 | offset -= (mc_top_offset - forwarded_offset); |
| 3066 | offset += Page::kObjectStartOffset; |
| 3067 | |
| 3068 | ASSERT_PAGE_OFFSET(offset); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3069 | ASSERT(next_page->OffsetToAddress(offset) < next_page->AllocationTop()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3070 | |
| 3071 | return next_page->OffsetToAddress(offset); |
| 3072 | } |
| 3073 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3074 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 3075 | // ------------------------------------------------------------------------- |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3076 | // Phase 4: Relocate objects |
| 3077 | |
| 3078 | void MarkCompactCollector::RelocateObjects() { |
| 3079 | #ifdef DEBUG |
| 3080 | ASSERT(state_ == UPDATE_POINTERS); |
| 3081 | state_ = RELOCATE_OBJECTS; |
| 3082 | #endif |
| 3083 | // Relocates objects, always relocate map objects first. Relocating |
| 3084 | // objects in other space relies on map objects to get object size. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3085 | int live_maps_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3086 | heap()->map_space(), &MarkCompactCollector::RelocateMapObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3087 | int live_pointer_olds_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3088 | heap()->old_pointer_space(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3089 | &MarkCompactCollector::RelocateOldPointerObject); |
| 3090 | int live_data_olds_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3091 | heap()->old_data_space(), &MarkCompactCollector::RelocateOldDataObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3092 | int live_codes_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3093 | heap()->code_space(), &MarkCompactCollector::RelocateCodeObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3094 | int live_cells_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3095 | heap()->cell_space(), &MarkCompactCollector::RelocateCellObject); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3096 | int live_news_size = IterateLiveObjects( |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3097 | heap()->new_space(), &MarkCompactCollector::RelocateNewObject); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3098 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3099 | USE(live_maps_size); |
| 3100 | USE(live_pointer_olds_size); |
| 3101 | USE(live_data_olds_size); |
| 3102 | USE(live_codes_size); |
| 3103 | USE(live_cells_size); |
| 3104 | USE(live_news_size); |
| 3105 | ASSERT(live_maps_size == live_map_objects_size_); |
| 3106 | ASSERT(live_data_olds_size == live_old_data_objects_size_); |
| 3107 | ASSERT(live_pointer_olds_size == live_old_pointer_objects_size_); |
| 3108 | ASSERT(live_codes_size == live_code_objects_size_); |
| 3109 | ASSERT(live_cells_size == live_cell_objects_size_); |
| 3110 | ASSERT(live_news_size == live_young_objects_size_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3111 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3112 | // Flip from and to spaces |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3113 | heap()->new_space()->Flip(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3114 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3115 | heap()->new_space()->MCCommitRelocationInfo(); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3116 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3117 | // Set age_mark to bottom in to space |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3118 | Address mark = heap()->new_space()->bottom(); |
| 3119 | heap()->new_space()->set_age_mark(mark); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3120 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3121 | PagedSpaces spaces; |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3122 | for (PagedSpace* space = spaces.next(); space != NULL; space = spaces.next()) |
| 3123 | space->MCCommitRelocationInfo(); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3124 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3125 | heap()->CheckNewSpaceExpansionCriteria(); |
| 3126 | heap()->IncrementYoungSurvivorsCounter(live_news_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3127 | } |
| 3128 | |
| 3129 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3130 | int MarkCompactCollector::RelocateMapObject(HeapObject* obj) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3131 | // Recover map pointer. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 3132 | MapWord encoding = obj->map_word(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3133 | Address map_addr = encoding.DecodeMapAddress(heap()->map_space()); |
| 3134 | ASSERT(heap()->map_space()->Contains(HeapObject::FromAddress(map_addr))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3135 | |
| 3136 | // Get forwarding address before resetting map pointer |
| 3137 | Address new_addr = GetForwardingAddressInOldSpace(obj); |
| 3138 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3139 | // Reset map pointer. The meta map object may not be copied yet so |
| 3140 | // Map::cast does not yet work. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3141 | obj->set_map(reinterpret_cast<Map*>(HeapObject::FromAddress(map_addr))); |
| 3142 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3143 | Address old_addr = obj->address(); |
| 3144 | |
| 3145 | if (new_addr != old_addr) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3146 | // Move contents. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3147 | heap()->MoveBlockToOldSpaceAndUpdateRegionMarks(new_addr, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3148 | old_addr, |
| 3149 | Map::kSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3150 | } |
| 3151 | |
| 3152 | #ifdef DEBUG |
| 3153 | if (FLAG_gc_verbose) { |
| 3154 | PrintF("relocate %p -> %p\n", old_addr, new_addr); |
| 3155 | } |
| 3156 | #endif |
| 3157 | |
| 3158 | return Map::kSize; |
| 3159 | } |
| 3160 | |
| 3161 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3162 | static inline int RestoreMap(HeapObject* obj, |
| 3163 | PagedSpace* space, |
| 3164 | Address new_addr, |
| 3165 | Address map_addr) { |
| 3166 | // This must be a non-map object, and the function relies on the |
| 3167 | // assumption that the Map space is compacted before the other paged |
| 3168 | // spaces (see RelocateObjects). |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3169 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3170 | // Reset map pointer. |
| 3171 | obj->set_map(Map::cast(HeapObject::FromAddress(map_addr))); |
| 3172 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3173 | int obj_size = obj->Size(); |
| 3174 | ASSERT_OBJECT_SIZE(obj_size); |
| 3175 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3176 | ASSERT(space->MCSpaceOffsetForAddress(new_addr) <= |
| 3177 | space->MCSpaceOffsetForAddress(obj->address())); |
| 3178 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3179 | #ifdef DEBUG |
| 3180 | if (FLAG_gc_verbose) { |
| 3181 | PrintF("relocate %p -> %p\n", obj->address(), new_addr); |
| 3182 | } |
| 3183 | #endif |
| 3184 | |
| 3185 | return obj_size; |
| 3186 | } |
| 3187 | |
| 3188 | |
| 3189 | int MarkCompactCollector::RelocateOldNonCodeObject(HeapObject* obj, |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3190 | PagedSpace* space) { |
| 3191 | // Recover map pointer. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3192 | MapWord encoding = obj->map_word(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3193 | Address map_addr = encoding.DecodeMapAddress(heap()->map_space()); |
| 3194 | ASSERT(heap()->map_space()->Contains(map_addr)); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3195 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3196 | // Get forwarding address before resetting map pointer. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3197 | Address new_addr = GetForwardingAddressInOldSpace(obj); |
| 3198 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3199 | // Reset the map pointer. |
| 3200 | int obj_size = RestoreMap(obj, space, new_addr, map_addr); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3201 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3202 | Address old_addr = obj->address(); |
| 3203 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3204 | if (new_addr != old_addr) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3205 | // Move contents. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3206 | if (space == heap()->old_data_space()) { |
| 3207 | heap()->MoveBlock(new_addr, old_addr, obj_size); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3208 | } else { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3209 | heap()->MoveBlockToOldSpaceAndUpdateRegionMarks(new_addr, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3210 | old_addr, |
| 3211 | obj_size); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3212 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3213 | } |
| 3214 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3215 | ASSERT(!HeapObject::FromAddress(new_addr)->IsCode()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3216 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3217 | HeapObject* copied_to = HeapObject::FromAddress(new_addr); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 3218 | if (copied_to->IsSharedFunctionInfo()) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3219 | PROFILE(heap()->isolate(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3220 | SharedFunctionInfoMoveEvent(old_addr, new_addr)); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3221 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3222 | HEAP_PROFILE(heap(), ObjectMoveEvent(old_addr, new_addr)); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3223 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3224 | return obj_size; |
| 3225 | } |
| 3226 | |
| 3227 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3228 | int MarkCompactCollector::RelocateOldPointerObject(HeapObject* obj) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3229 | return RelocateOldNonCodeObject(obj, heap()->old_pointer_space()); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3230 | } |
| 3231 | |
| 3232 | |
| 3233 | int MarkCompactCollector::RelocateOldDataObject(HeapObject* obj) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3234 | return RelocateOldNonCodeObject(obj, heap()->old_data_space()); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3235 | } |
| 3236 | |
| 3237 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3238 | int MarkCompactCollector::RelocateCellObject(HeapObject* obj) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3239 | return RelocateOldNonCodeObject(obj, heap()->cell_space()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3240 | } |
| 3241 | |
| 3242 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3243 | int MarkCompactCollector::RelocateCodeObject(HeapObject* obj) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3244 | // Recover map pointer. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 3245 | MapWord encoding = obj->map_word(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3246 | Address map_addr = encoding.DecodeMapAddress(heap()->map_space()); |
| 3247 | ASSERT(heap()->map_space()->Contains(HeapObject::FromAddress(map_addr))); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3248 | |
| 3249 | // Get forwarding address before resetting map pointer |
| 3250 | Address new_addr = GetForwardingAddressInOldSpace(obj); |
| 3251 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3252 | // Reset the map pointer. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3253 | int obj_size = RestoreMap(obj, heap()->code_space(), new_addr, map_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3254 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 3255 | Address old_addr = obj->address(); |
| 3256 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3257 | if (new_addr != old_addr) { |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 3258 | // Move contents. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3259 | heap()->MoveBlock(new_addr, old_addr, obj_size); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3260 | } |
| 3261 | |
| 3262 | HeapObject* copied_to = HeapObject::FromAddress(new_addr); |
| 3263 | if (copied_to->IsCode()) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3264 | // May also update inline cache target. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3265 | Code::cast(copied_to)->Relocate(new_addr - old_addr); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 3266 | // Notify the logger that compiled code has moved. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3267 | PROFILE(heap()->isolate(), CodeMoveEvent(old_addr, new_addr)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3268 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3269 | HEAP_PROFILE(heap(), ObjectMoveEvent(old_addr, new_addr)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3270 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3271 | return obj_size; |
| 3272 | } |
| 3273 | |
| 3274 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3275 | int MarkCompactCollector::RelocateNewObject(HeapObject* obj) { |
| 3276 | int obj_size = obj->Size(); |
| 3277 | |
| 3278 | // Get forwarding address |
| 3279 | Address old_addr = obj->address(); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3280 | int offset = heap()->new_space()->ToSpaceOffsetForAddress(old_addr); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3281 | |
| 3282 | Address new_addr = |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3283 | Memory::Address_at(heap()->new_space()->FromSpaceLow() + offset); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3284 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3285 | #ifdef DEBUG |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3286 | if (heap()->new_space()->FromSpaceContains(new_addr)) { |
| 3287 | ASSERT(heap()->new_space()->FromSpaceOffsetForAddress(new_addr) <= |
| 3288 | heap()->new_space()->ToSpaceOffsetForAddress(old_addr)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3289 | } else { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3290 | ASSERT(heap()->TargetSpace(obj) == heap()->old_pointer_space() || |
| 3291 | heap()->TargetSpace(obj) == heap()->old_data_space()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3292 | } |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 3293 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3294 | |
| 3295 | // New and old addresses cannot overlap. |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3296 | if (heap()->InNewSpace(HeapObject::FromAddress(new_addr))) { |
| 3297 | heap()->CopyBlock(new_addr, old_addr, obj_size); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3298 | } else { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3299 | heap()->CopyBlockToOldSpaceAndUpdateRegionMarks(new_addr, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3300 | old_addr, |
| 3301 | obj_size); |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 3302 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3303 | |
| 3304 | #ifdef DEBUG |
| 3305 | if (FLAG_gc_verbose) { |
| 3306 | PrintF("relocate %p -> %p\n", old_addr, new_addr); |
| 3307 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3308 | #endif |
| 3309 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3310 | HeapObject* copied_to = HeapObject::FromAddress(new_addr); |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 3311 | if (copied_to->IsSharedFunctionInfo()) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3312 | PROFILE(heap()->isolate(), |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3313 | SharedFunctionInfoMoveEvent(old_addr, new_addr)); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3314 | } |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3315 | HEAP_PROFILE(heap(), ObjectMoveEvent(old_addr, new_addr)); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3316 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3317 | return obj_size; |
| 3318 | } |
| 3319 | |
| 3320 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3321 | void MarkCompactCollector::EnableCodeFlushing(bool enable) { |
| 3322 | if (enable) { |
| 3323 | if (code_flusher_ != NULL) return; |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3324 | code_flusher_ = new CodeFlusher(heap()->isolate()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 3325 | } else { |
| 3326 | if (code_flusher_ == NULL) return; |
| 3327 | delete code_flusher_; |
| 3328 | code_flusher_ = NULL; |
| 3329 | } |
| 3330 | } |
| 3331 | |
| 3332 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3333 | void MarkCompactCollector::ReportDeleteIfNeeded(HeapObject* obj, |
| 3334 | Isolate* isolate) { |
erik.corry@gmail.com | 0511e24 | 2011-01-19 11:11:08 +0000 | [diff] [blame] | 3335 | #ifdef ENABLE_GDB_JIT_INTERFACE |
| 3336 | if (obj->IsCode()) { |
| 3337 | GDBJITInterface::RemoveCode(reinterpret_cast<Code*>(obj)); |
| 3338 | } |
| 3339 | #endif |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3340 | if (obj->IsCode()) { |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 3341 | PROFILE(isolate, CodeDeleteEvent(obj->address())); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3342 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 3343 | } |
| 3344 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 3345 | |
erik.corry@gmail.com | 4a6c327 | 2010-11-18 12:04:40 +0000 | [diff] [blame] | 3346 | int MarkCompactCollector::SizeOfMarkedObject(HeapObject* obj) { |
| 3347 | MapWord map_word = obj->map_word(); |
| 3348 | map_word.ClearMark(); |
| 3349 | return obj->SizeFromMap(map_word.ToMap()); |
| 3350 | } |
| 3351 | |
| 3352 | |
ager@chromium.org | ea4f62e | 2010-08-16 16:28:43 +0000 | [diff] [blame] | 3353 | void MarkCompactCollector::Initialize() { |
| 3354 | StaticPointersToNewGenUpdatingVisitor::Initialize(); |
| 3355 | StaticMarkingVisitor::Initialize(); |
| 3356 | } |
| 3357 | |
| 3358 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 3359 | } } // namespace v8::internal |