ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1 | // Copyright 2006-2008 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #include "macro-assembler.h" |
| 31 | #include "mark-compact.h" |
| 32 | #include "platform.h" |
| 33 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 34 | namespace v8 { |
| 35 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 36 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 37 | // For contiguous spaces, top should be in the space (or at the end) and limit |
| 38 | // should be the end of the space. |
| 39 | #define ASSERT_SEMISPACE_ALLOCATION_INFO(info, space) \ |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 40 | ASSERT((space).low() <= (info).top \ |
| 41 | && (info).top <= (space).high() \ |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 42 | && (info).limit == (space).high()) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 43 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 44 | |
| 45 | // ---------------------------------------------------------------------------- |
| 46 | // HeapObjectIterator |
| 47 | |
| 48 | HeapObjectIterator::HeapObjectIterator(PagedSpace* space) { |
| 49 | Initialize(space->bottom(), space->top(), NULL); |
| 50 | } |
| 51 | |
| 52 | |
| 53 | HeapObjectIterator::HeapObjectIterator(PagedSpace* space, |
| 54 | HeapObjectCallback size_func) { |
| 55 | Initialize(space->bottom(), space->top(), size_func); |
| 56 | } |
| 57 | |
| 58 | |
| 59 | HeapObjectIterator::HeapObjectIterator(PagedSpace* space, Address start) { |
| 60 | Initialize(start, space->top(), NULL); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | HeapObjectIterator::HeapObjectIterator(PagedSpace* space, Address start, |
| 65 | HeapObjectCallback size_func) { |
| 66 | Initialize(start, space->top(), size_func); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | void HeapObjectIterator::Initialize(Address cur, Address end, |
| 71 | HeapObjectCallback size_f) { |
| 72 | cur_addr_ = cur; |
| 73 | end_addr_ = end; |
| 74 | end_page_ = Page::FromAllocationTop(end); |
| 75 | size_func_ = size_f; |
| 76 | Page* p = Page::FromAllocationTop(cur_addr_); |
| 77 | cur_limit_ = (p == end_page_) ? end_addr_ : p->AllocationTop(); |
| 78 | |
| 79 | #ifdef DEBUG |
| 80 | Verify(); |
| 81 | #endif |
| 82 | } |
| 83 | |
| 84 | |
| 85 | bool HeapObjectIterator::HasNextInNextPage() { |
| 86 | if (cur_addr_ == end_addr_) return false; |
| 87 | |
| 88 | Page* cur_page = Page::FromAllocationTop(cur_addr_); |
| 89 | cur_page = cur_page->next_page(); |
| 90 | ASSERT(cur_page->is_valid()); |
| 91 | |
| 92 | cur_addr_ = cur_page->ObjectAreaStart(); |
| 93 | cur_limit_ = (cur_page == end_page_) ? end_addr_ : cur_page->AllocationTop(); |
| 94 | |
| 95 | ASSERT(cur_addr_ < cur_limit_); |
| 96 | #ifdef DEBUG |
| 97 | Verify(); |
| 98 | #endif |
| 99 | return true; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | #ifdef DEBUG |
| 104 | void HeapObjectIterator::Verify() { |
| 105 | Page* p = Page::FromAllocationTop(cur_addr_); |
| 106 | ASSERT(p == Page::FromAllocationTop(cur_limit_)); |
| 107 | ASSERT(p->Offset(cur_addr_) <= p->Offset(cur_limit_)); |
| 108 | } |
| 109 | #endif |
| 110 | |
| 111 | |
| 112 | // ----------------------------------------------------------------------------- |
| 113 | // PageIterator |
| 114 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 115 | PageIterator::PageIterator(PagedSpace* space, Mode mode) : space_(space) { |
| 116 | prev_page_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 117 | switch (mode) { |
| 118 | case PAGES_IN_USE: |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 119 | stop_page_ = space->AllocationTopPage(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 120 | break; |
| 121 | case PAGES_USED_BY_MC: |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 122 | stop_page_ = space->MCRelocationTopPage(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 123 | break; |
| 124 | case ALL_PAGES: |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 125 | #ifdef DEBUG |
| 126 | // Verify that the cached last page in the space is actually the |
| 127 | // last page. |
| 128 | for (Page* p = space->first_page_; p->is_valid(); p = p->next_page()) { |
| 129 | if (!p->next_page()->is_valid()) { |
| 130 | ASSERT(space->last_page_ == p); |
| 131 | } |
| 132 | } |
| 133 | #endif |
| 134 | stop_page_ = space->last_page_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 135 | break; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 136 | } |
| 137 | } |
| 138 | |
| 139 | |
| 140 | // ----------------------------------------------------------------------------- |
| 141 | // Page |
| 142 | |
| 143 | #ifdef DEBUG |
| 144 | Page::RSetState Page::rset_state_ = Page::IN_USE; |
| 145 | #endif |
| 146 | |
| 147 | // ----------------------------------------------------------------------------- |
| 148 | // MemoryAllocator |
| 149 | // |
| 150 | int MemoryAllocator::capacity_ = 0; |
| 151 | int MemoryAllocator::size_ = 0; |
| 152 | |
| 153 | VirtualMemory* MemoryAllocator::initial_chunk_ = NULL; |
| 154 | |
| 155 | // 270 is an estimate based on the static default heap size of a pair of 256K |
| 156 | // semispaces and a 64M old generation. |
| 157 | const int kEstimatedNumberOfChunks = 270; |
| 158 | List<MemoryAllocator::ChunkInfo> MemoryAllocator::chunks_( |
| 159 | kEstimatedNumberOfChunks); |
| 160 | List<int> MemoryAllocator::free_chunk_ids_(kEstimatedNumberOfChunks); |
| 161 | int MemoryAllocator::max_nof_chunks_ = 0; |
| 162 | int MemoryAllocator::top_ = 0; |
| 163 | |
| 164 | |
| 165 | void MemoryAllocator::Push(int free_chunk_id) { |
| 166 | ASSERT(max_nof_chunks_ > 0); |
| 167 | ASSERT(top_ < max_nof_chunks_); |
| 168 | free_chunk_ids_[top_++] = free_chunk_id; |
| 169 | } |
| 170 | |
| 171 | |
| 172 | int MemoryAllocator::Pop() { |
| 173 | ASSERT(top_ > 0); |
| 174 | return free_chunk_ids_[--top_]; |
| 175 | } |
| 176 | |
| 177 | |
| 178 | bool MemoryAllocator::Setup(int capacity) { |
| 179 | capacity_ = RoundUp(capacity, Page::kPageSize); |
| 180 | |
| 181 | // Over-estimate the size of chunks_ array. It assumes the expansion of old |
| 182 | // space is always in the unit of a chunk (kChunkSize) except the last |
| 183 | // expansion. |
| 184 | // |
| 185 | // Due to alignment, allocated space might be one page less than required |
| 186 | // number (kPagesPerChunk) of pages for old spaces. |
| 187 | // |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 188 | // Reserve two chunk ids for semispaces, one for map space, one for old |
| 189 | // space, and one for code space. |
| 190 | max_nof_chunks_ = (capacity_ / (kChunkSize - Page::kPageSize)) + 5; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 191 | if (max_nof_chunks_ > kMaxNofChunks) return false; |
| 192 | |
| 193 | size_ = 0; |
| 194 | ChunkInfo info; // uninitialized element. |
| 195 | for (int i = max_nof_chunks_ - 1; i >= 0; i--) { |
| 196 | chunks_.Add(info); |
| 197 | free_chunk_ids_.Add(i); |
| 198 | } |
| 199 | top_ = max_nof_chunks_; |
| 200 | return true; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | void MemoryAllocator::TearDown() { |
| 205 | for (int i = 0; i < max_nof_chunks_; i++) { |
| 206 | if (chunks_[i].address() != NULL) DeleteChunk(i); |
| 207 | } |
| 208 | chunks_.Clear(); |
| 209 | free_chunk_ids_.Clear(); |
| 210 | |
| 211 | if (initial_chunk_ != NULL) { |
| 212 | LOG(DeleteEvent("InitialChunk", initial_chunk_->address())); |
| 213 | delete initial_chunk_; |
| 214 | initial_chunk_ = NULL; |
| 215 | } |
| 216 | |
| 217 | ASSERT(top_ == max_nof_chunks_); // all chunks are free |
| 218 | top_ = 0; |
| 219 | capacity_ = 0; |
| 220 | size_ = 0; |
| 221 | max_nof_chunks_ = 0; |
| 222 | } |
| 223 | |
| 224 | |
| 225 | void* MemoryAllocator::AllocateRawMemory(const size_t requested, |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 226 | size_t* allocated, |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 227 | Executability executable) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 228 | if (size_ + static_cast<int>(requested) > capacity_) return NULL; |
| 229 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 230 | void* mem = OS::Allocate(requested, allocated, executable == EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 231 | int alloced = *allocated; |
| 232 | size_ += alloced; |
| 233 | Counters::memory_allocated.Increment(alloced); |
| 234 | return mem; |
| 235 | } |
| 236 | |
| 237 | |
| 238 | void MemoryAllocator::FreeRawMemory(void* mem, size_t length) { |
| 239 | OS::Free(mem, length); |
| 240 | Counters::memory_allocated.Decrement(length); |
| 241 | size_ -= length; |
| 242 | ASSERT(size_ >= 0); |
| 243 | } |
| 244 | |
| 245 | |
| 246 | void* MemoryAllocator::ReserveInitialChunk(const size_t requested) { |
| 247 | ASSERT(initial_chunk_ == NULL); |
| 248 | |
| 249 | initial_chunk_ = new VirtualMemory(requested); |
| 250 | CHECK(initial_chunk_ != NULL); |
| 251 | if (!initial_chunk_->IsReserved()) { |
| 252 | delete initial_chunk_; |
| 253 | initial_chunk_ = NULL; |
| 254 | return NULL; |
| 255 | } |
| 256 | |
| 257 | // We are sure that we have mapped a block of requested addresses. |
| 258 | ASSERT(initial_chunk_->size() == requested); |
| 259 | LOG(NewEvent("InitialChunk", initial_chunk_->address(), requested)); |
| 260 | size_ += requested; |
| 261 | return initial_chunk_->address(); |
| 262 | } |
| 263 | |
| 264 | |
| 265 | static int PagesInChunk(Address start, size_t size) { |
| 266 | // The first page starts on the first page-aligned address from start onward |
| 267 | // and the last page ends on the last page-aligned address before |
| 268 | // start+size. Page::kPageSize is a power of two so we can divide by |
| 269 | // shifting. |
| 270 | return (RoundDown(start + size, Page::kPageSize) |
| 271 | - RoundUp(start, Page::kPageSize)) >> Page::kPageSizeBits; |
| 272 | } |
| 273 | |
| 274 | |
| 275 | Page* MemoryAllocator::AllocatePages(int requested_pages, int* allocated_pages, |
| 276 | PagedSpace* owner) { |
| 277 | if (requested_pages <= 0) return Page::FromAddress(NULL); |
| 278 | size_t chunk_size = requested_pages * Page::kPageSize; |
| 279 | |
| 280 | // There is not enough space to guarantee the desired number pages can be |
| 281 | // allocated. |
| 282 | if (size_ + static_cast<int>(chunk_size) > capacity_) { |
| 283 | // Request as many pages as we can. |
| 284 | chunk_size = capacity_ - size_; |
| 285 | requested_pages = chunk_size >> Page::kPageSizeBits; |
| 286 | |
| 287 | if (requested_pages <= 0) return Page::FromAddress(NULL); |
| 288 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 289 | void* chunk = AllocateRawMemory(chunk_size, &chunk_size, owner->executable()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 290 | if (chunk == NULL) return Page::FromAddress(NULL); |
| 291 | LOG(NewEvent("PagedChunk", chunk, chunk_size)); |
| 292 | |
| 293 | *allocated_pages = PagesInChunk(static_cast<Address>(chunk), chunk_size); |
| 294 | if (*allocated_pages == 0) { |
| 295 | FreeRawMemory(chunk, chunk_size); |
| 296 | LOG(DeleteEvent("PagedChunk", chunk)); |
| 297 | return Page::FromAddress(NULL); |
| 298 | } |
| 299 | |
| 300 | int chunk_id = Pop(); |
| 301 | chunks_[chunk_id].init(static_cast<Address>(chunk), chunk_size, owner); |
| 302 | |
| 303 | return InitializePagesInChunk(chunk_id, *allocated_pages, owner); |
| 304 | } |
| 305 | |
| 306 | |
| 307 | Page* MemoryAllocator::CommitPages(Address start, size_t size, |
| 308 | PagedSpace* owner, int* num_pages) { |
| 309 | ASSERT(start != NULL); |
| 310 | *num_pages = PagesInChunk(start, size); |
| 311 | ASSERT(*num_pages > 0); |
| 312 | ASSERT(initial_chunk_ != NULL); |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 313 | ASSERT(InInitialChunk(start)); |
| 314 | ASSERT(InInitialChunk(start + size - 1)); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 315 | if (!initial_chunk_->Commit(start, size, owner->executable() == EXECUTABLE)) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 316 | return Page::FromAddress(NULL); |
| 317 | } |
| 318 | Counters::memory_allocated.Increment(size); |
| 319 | |
| 320 | // So long as we correctly overestimated the number of chunks we should not |
| 321 | // run out of chunk ids. |
| 322 | CHECK(!OutOfChunkIds()); |
| 323 | int chunk_id = Pop(); |
| 324 | chunks_[chunk_id].init(start, size, owner); |
| 325 | return InitializePagesInChunk(chunk_id, *num_pages, owner); |
| 326 | } |
| 327 | |
| 328 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 329 | bool MemoryAllocator::CommitBlock(Address start, |
| 330 | size_t size, |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 331 | Executability executable) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 332 | ASSERT(start != NULL); |
| 333 | ASSERT(size > 0); |
| 334 | ASSERT(initial_chunk_ != NULL); |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 335 | ASSERT(InInitialChunk(start)); |
| 336 | ASSERT(InInitialChunk(start + size - 1)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 337 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 338 | if (!initial_chunk_->Commit(start, size, executable)) return false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 339 | Counters::memory_allocated.Increment(size); |
| 340 | return true; |
| 341 | } |
| 342 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 343 | bool MemoryAllocator::UncommitBlock(Address start, size_t size) { |
| 344 | ASSERT(start != NULL); |
| 345 | ASSERT(size > 0); |
| 346 | ASSERT(initial_chunk_ != NULL); |
| 347 | ASSERT(InInitialChunk(start)); |
| 348 | ASSERT(InInitialChunk(start + size - 1)); |
| 349 | |
| 350 | if (!initial_chunk_->Uncommit(start, size)) return false; |
| 351 | Counters::memory_allocated.Decrement(size); |
| 352 | return true; |
| 353 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 354 | |
| 355 | Page* MemoryAllocator::InitializePagesInChunk(int chunk_id, int pages_in_chunk, |
| 356 | PagedSpace* owner) { |
| 357 | ASSERT(IsValidChunk(chunk_id)); |
| 358 | ASSERT(pages_in_chunk > 0); |
| 359 | |
| 360 | Address chunk_start = chunks_[chunk_id].address(); |
| 361 | |
| 362 | Address low = RoundUp(chunk_start, Page::kPageSize); |
| 363 | |
| 364 | #ifdef DEBUG |
| 365 | size_t chunk_size = chunks_[chunk_id].size(); |
| 366 | Address high = RoundDown(chunk_start + chunk_size, Page::kPageSize); |
| 367 | ASSERT(pages_in_chunk <= |
| 368 | ((OffsetFrom(high) - OffsetFrom(low)) / Page::kPageSize)); |
| 369 | #endif |
| 370 | |
| 371 | Address page_addr = low; |
| 372 | for (int i = 0; i < pages_in_chunk; i++) { |
| 373 | Page* p = Page::FromAddress(page_addr); |
| 374 | p->opaque_header = OffsetFrom(page_addr + Page::kPageSize) | chunk_id; |
| 375 | p->is_normal_page = 1; |
| 376 | page_addr += Page::kPageSize; |
| 377 | } |
| 378 | |
| 379 | // Set the next page of the last page to 0. |
| 380 | Page* last_page = Page::FromAddress(page_addr - Page::kPageSize); |
| 381 | last_page->opaque_header = OffsetFrom(0) | chunk_id; |
| 382 | |
| 383 | return Page::FromAddress(low); |
| 384 | } |
| 385 | |
| 386 | |
| 387 | Page* MemoryAllocator::FreePages(Page* p) { |
| 388 | if (!p->is_valid()) return p; |
| 389 | |
| 390 | // Find the first page in the same chunk as 'p' |
| 391 | Page* first_page = FindFirstPageInSameChunk(p); |
| 392 | Page* page_to_return = Page::FromAddress(NULL); |
| 393 | |
| 394 | if (p != first_page) { |
| 395 | // Find the last page in the same chunk as 'prev'. |
| 396 | Page* last_page = FindLastPageInSameChunk(p); |
| 397 | first_page = GetNextPage(last_page); // first page in next chunk |
| 398 | |
| 399 | // set the next_page of last_page to NULL |
| 400 | SetNextPage(last_page, Page::FromAddress(NULL)); |
| 401 | page_to_return = p; // return 'p' when exiting |
| 402 | } |
| 403 | |
| 404 | while (first_page->is_valid()) { |
| 405 | int chunk_id = GetChunkId(first_page); |
| 406 | ASSERT(IsValidChunk(chunk_id)); |
| 407 | |
| 408 | // Find the first page of the next chunk before deleting this chunk. |
| 409 | first_page = GetNextPage(FindLastPageInSameChunk(first_page)); |
| 410 | |
| 411 | // Free the current chunk. |
| 412 | DeleteChunk(chunk_id); |
| 413 | } |
| 414 | |
| 415 | return page_to_return; |
| 416 | } |
| 417 | |
| 418 | |
| 419 | void MemoryAllocator::DeleteChunk(int chunk_id) { |
| 420 | ASSERT(IsValidChunk(chunk_id)); |
| 421 | |
| 422 | ChunkInfo& c = chunks_[chunk_id]; |
| 423 | |
| 424 | // We cannot free a chunk contained in the initial chunk because it was not |
| 425 | // allocated with AllocateRawMemory. Instead we uncommit the virtual |
| 426 | // memory. |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 427 | if (InInitialChunk(c.address())) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 428 | // TODO(1240712): VirtualMemory::Uncommit has a return value which |
| 429 | // is ignored here. |
| 430 | initial_chunk_->Uncommit(c.address(), c.size()); |
| 431 | Counters::memory_allocated.Decrement(c.size()); |
| 432 | } else { |
| 433 | LOG(DeleteEvent("PagedChunk", c.address())); |
| 434 | FreeRawMemory(c.address(), c.size()); |
| 435 | } |
| 436 | c.init(NULL, 0, NULL); |
| 437 | Push(chunk_id); |
| 438 | } |
| 439 | |
| 440 | |
| 441 | Page* MemoryAllocator::FindFirstPageInSameChunk(Page* p) { |
| 442 | int chunk_id = GetChunkId(p); |
| 443 | ASSERT(IsValidChunk(chunk_id)); |
| 444 | |
| 445 | Address low = RoundUp(chunks_[chunk_id].address(), Page::kPageSize); |
| 446 | return Page::FromAddress(low); |
| 447 | } |
| 448 | |
| 449 | |
| 450 | Page* MemoryAllocator::FindLastPageInSameChunk(Page* p) { |
| 451 | int chunk_id = GetChunkId(p); |
| 452 | ASSERT(IsValidChunk(chunk_id)); |
| 453 | |
| 454 | Address chunk_start = chunks_[chunk_id].address(); |
| 455 | size_t chunk_size = chunks_[chunk_id].size(); |
| 456 | |
| 457 | Address high = RoundDown(chunk_start + chunk_size, Page::kPageSize); |
| 458 | ASSERT(chunk_start <= p->address() && p->address() < high); |
| 459 | |
| 460 | return Page::FromAddress(high - Page::kPageSize); |
| 461 | } |
| 462 | |
| 463 | |
| 464 | #ifdef DEBUG |
| 465 | void MemoryAllocator::ReportStatistics() { |
| 466 | float pct = static_cast<float>(capacity_ - size_) / capacity_; |
| 467 | PrintF(" capacity: %d, used: %d, available: %%%d\n\n", |
| 468 | capacity_, size_, static_cast<int>(pct*100)); |
| 469 | } |
| 470 | #endif |
| 471 | |
| 472 | |
| 473 | // ----------------------------------------------------------------------------- |
| 474 | // PagedSpace implementation |
| 475 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 476 | PagedSpace::PagedSpace(int max_capacity, |
| 477 | AllocationSpace id, |
| 478 | Executability executable) |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 479 | : Space(id, executable) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 480 | max_capacity_ = (RoundDown(max_capacity, Page::kPageSize) / Page::kPageSize) |
| 481 | * Page::kObjectAreaSize; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 482 | accounting_stats_.Clear(); |
| 483 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 484 | allocation_info_.top = NULL; |
| 485 | allocation_info_.limit = NULL; |
| 486 | |
| 487 | mc_forwarding_info_.top = NULL; |
| 488 | mc_forwarding_info_.limit = NULL; |
| 489 | } |
| 490 | |
| 491 | |
| 492 | bool PagedSpace::Setup(Address start, size_t size) { |
| 493 | if (HasBeenSetup()) return false; |
| 494 | |
| 495 | int num_pages = 0; |
| 496 | // Try to use the virtual memory range passed to us. If it is too small to |
| 497 | // contain at least one page, ignore it and allocate instead. |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 498 | int pages_in_chunk = PagesInChunk(start, size); |
| 499 | if (pages_in_chunk > 0) { |
| 500 | first_page_ = MemoryAllocator::CommitPages(RoundUp(start, Page::kPageSize), |
| 501 | Page::kPageSize * pages_in_chunk, |
| 502 | this, &num_pages); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 503 | } else { |
| 504 | int requested_pages = Min(MemoryAllocator::kPagesPerChunk, |
| 505 | max_capacity_ / Page::kObjectAreaSize); |
| 506 | first_page_ = |
| 507 | MemoryAllocator::AllocatePages(requested_pages, &num_pages, this); |
| 508 | if (!first_page_->is_valid()) return false; |
| 509 | } |
| 510 | |
| 511 | // We are sure that the first page is valid and that we have at least one |
| 512 | // page. |
| 513 | ASSERT(first_page_->is_valid()); |
| 514 | ASSERT(num_pages > 0); |
| 515 | accounting_stats_.ExpandSpace(num_pages * Page::kObjectAreaSize); |
| 516 | ASSERT(Capacity() <= max_capacity_); |
| 517 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 518 | // Sequentially initialize remembered sets in the newly allocated |
| 519 | // pages and cache the current last page in the space. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 520 | for (Page* p = first_page_; p->is_valid(); p = p->next_page()) { |
| 521 | p->ClearRSet(); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 522 | last_page_ = p; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | // Use first_page_ for allocation. |
| 526 | SetAllocationInfo(&allocation_info_, first_page_); |
| 527 | |
| 528 | return true; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | bool PagedSpace::HasBeenSetup() { |
| 533 | return (Capacity() > 0); |
| 534 | } |
| 535 | |
| 536 | |
| 537 | void PagedSpace::TearDown() { |
| 538 | first_page_ = MemoryAllocator::FreePages(first_page_); |
| 539 | ASSERT(!first_page_->is_valid()); |
| 540 | |
| 541 | accounting_stats_.Clear(); |
| 542 | } |
| 543 | |
| 544 | |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 545 | #ifdef ENABLE_HEAP_PROTECTION |
| 546 | |
| 547 | void PagedSpace::Protect() { |
| 548 | Page* page = first_page_; |
| 549 | while (page->is_valid()) { |
| 550 | MemoryAllocator::ProtectChunkFromPage(page); |
| 551 | page = MemoryAllocator::FindLastPageInSameChunk(page)->next_page(); |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | |
| 556 | void PagedSpace::Unprotect() { |
| 557 | Page* page = first_page_; |
| 558 | while (page->is_valid()) { |
| 559 | MemoryAllocator::UnprotectChunkFromPage(page); |
| 560 | page = MemoryAllocator::FindLastPageInSameChunk(page)->next_page(); |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | #endif |
| 565 | |
| 566 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 567 | void PagedSpace::ClearRSet() { |
| 568 | PageIterator it(this, PageIterator::ALL_PAGES); |
| 569 | while (it.has_next()) { |
| 570 | it.next()->ClearRSet(); |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | |
| 575 | Object* PagedSpace::FindObject(Address addr) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 576 | // Note: this function can only be called before or after mark-compact GC |
| 577 | // because it accesses map pointers. |
| 578 | ASSERT(!MarkCompactCollector::in_use()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 579 | |
| 580 | if (!Contains(addr)) return Failure::Exception(); |
| 581 | |
| 582 | Page* p = Page::FromAddress(addr); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 583 | ASSERT(IsUsed(p)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 584 | Address cur = p->ObjectAreaStart(); |
| 585 | Address end = p->AllocationTop(); |
| 586 | while (cur < end) { |
| 587 | HeapObject* obj = HeapObject::FromAddress(cur); |
| 588 | Address next = cur + obj->Size(); |
| 589 | if ((cur <= addr) && (addr < next)) return obj; |
| 590 | cur = next; |
| 591 | } |
| 592 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 593 | UNREACHABLE(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 594 | return Failure::Exception(); |
| 595 | } |
| 596 | |
| 597 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 598 | bool PagedSpace::IsUsed(Page* page) { |
| 599 | PageIterator it(this, PageIterator::PAGES_IN_USE); |
| 600 | while (it.has_next()) { |
| 601 | if (page == it.next()) return true; |
| 602 | } |
| 603 | return false; |
| 604 | } |
| 605 | |
| 606 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 607 | void PagedSpace::SetAllocationInfo(AllocationInfo* alloc_info, Page* p) { |
| 608 | alloc_info->top = p->ObjectAreaStart(); |
| 609 | alloc_info->limit = p->ObjectAreaEnd(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 610 | ASSERT(alloc_info->VerifyPagedAllocation()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | |
| 614 | void PagedSpace::MCResetRelocationInfo() { |
| 615 | // Set page indexes. |
| 616 | int i = 0; |
| 617 | PageIterator it(this, PageIterator::ALL_PAGES); |
| 618 | while (it.has_next()) { |
| 619 | Page* p = it.next(); |
| 620 | p->mc_page_index = i++; |
| 621 | } |
| 622 | |
| 623 | // Set mc_forwarding_info_ to the first page in the space. |
| 624 | SetAllocationInfo(&mc_forwarding_info_, first_page_); |
| 625 | // All the bytes in the space are 'available'. We will rediscover |
| 626 | // allocated and wasted bytes during GC. |
| 627 | accounting_stats_.Reset(); |
| 628 | } |
| 629 | |
| 630 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 631 | int PagedSpace::MCSpaceOffsetForAddress(Address addr) { |
| 632 | #ifdef DEBUG |
| 633 | // The Contains function considers the address at the beginning of a |
| 634 | // page in the page, MCSpaceOffsetForAddress considers it is in the |
| 635 | // previous page. |
| 636 | if (Page::IsAlignedToPageSize(addr)) { |
| 637 | ASSERT(Contains(addr - kPointerSize)); |
| 638 | } else { |
| 639 | ASSERT(Contains(addr)); |
| 640 | } |
| 641 | #endif |
| 642 | |
| 643 | // If addr is at the end of a page, it belongs to previous page |
| 644 | Page* p = Page::IsAlignedToPageSize(addr) |
| 645 | ? Page::FromAllocationTop(addr) |
| 646 | : Page::FromAddress(addr); |
| 647 | int index = p->mc_page_index; |
| 648 | return (index * Page::kPageSize) + p->Offset(addr); |
| 649 | } |
| 650 | |
| 651 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 652 | // Slow case for reallocating and promoting objects during a compacting |
| 653 | // collection. This function is not space-specific. |
| 654 | HeapObject* PagedSpace::SlowMCAllocateRaw(int size_in_bytes) { |
| 655 | Page* current_page = TopPageOf(mc_forwarding_info_); |
| 656 | if (!current_page->next_page()->is_valid()) { |
| 657 | if (!Expand(current_page)) { |
| 658 | return NULL; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | // There are surely more pages in the space now. |
| 663 | ASSERT(current_page->next_page()->is_valid()); |
| 664 | // We do not add the top of page block for current page to the space's |
| 665 | // free list---the block may contain live objects so we cannot write |
| 666 | // bookkeeping information to it. Instead, we will recover top of page |
| 667 | // blocks when we move objects to their new locations. |
| 668 | // |
| 669 | // We do however write the allocation pointer to the page. The encoding |
| 670 | // of forwarding addresses is as an offset in terms of live bytes, so we |
| 671 | // need quick access to the allocation top of each page to decode |
| 672 | // forwarding addresses. |
| 673 | current_page->mc_relocation_top = mc_forwarding_info_.top; |
| 674 | SetAllocationInfo(&mc_forwarding_info_, current_page->next_page()); |
| 675 | return AllocateLinearly(&mc_forwarding_info_, size_in_bytes); |
| 676 | } |
| 677 | |
| 678 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 679 | bool PagedSpace::Expand(Page* last_page) { |
| 680 | ASSERT(max_capacity_ % Page::kObjectAreaSize == 0); |
| 681 | ASSERT(Capacity() % Page::kObjectAreaSize == 0); |
| 682 | |
| 683 | if (Capacity() == max_capacity_) return false; |
| 684 | |
| 685 | ASSERT(Capacity() < max_capacity_); |
| 686 | // Last page must be valid and its next page is invalid. |
| 687 | ASSERT(last_page->is_valid() && !last_page->next_page()->is_valid()); |
| 688 | |
| 689 | int available_pages = (max_capacity_ - Capacity()) / Page::kObjectAreaSize; |
| 690 | if (available_pages <= 0) return false; |
| 691 | |
| 692 | int desired_pages = Min(available_pages, MemoryAllocator::kPagesPerChunk); |
| 693 | Page* p = MemoryAllocator::AllocatePages(desired_pages, &desired_pages, this); |
| 694 | if (!p->is_valid()) return false; |
| 695 | |
| 696 | accounting_stats_.ExpandSpace(desired_pages * Page::kObjectAreaSize); |
| 697 | ASSERT(Capacity() <= max_capacity_); |
| 698 | |
| 699 | MemoryAllocator::SetNextPage(last_page, p); |
| 700 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 701 | // Sequentially clear remembered set of new pages and and cache the |
| 702 | // new last page in the space. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 703 | while (p->is_valid()) { |
| 704 | p->ClearRSet(); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 705 | last_page_ = p; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 706 | p = p->next_page(); |
| 707 | } |
| 708 | |
| 709 | return true; |
| 710 | } |
| 711 | |
| 712 | |
| 713 | #ifdef DEBUG |
| 714 | int PagedSpace::CountTotalPages() { |
| 715 | int count = 0; |
| 716 | for (Page* p = first_page_; p->is_valid(); p = p->next_page()) { |
| 717 | count++; |
| 718 | } |
| 719 | return count; |
| 720 | } |
| 721 | #endif |
| 722 | |
| 723 | |
| 724 | void PagedSpace::Shrink() { |
| 725 | // Release half of free pages. |
| 726 | Page* top_page = AllocationTopPage(); |
| 727 | ASSERT(top_page->is_valid()); |
| 728 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 729 | // Count the number of pages we would like to free. |
| 730 | int pages_to_free = 0; |
| 731 | for (Page* p = top_page->next_page(); p->is_valid(); p = p->next_page()) { |
| 732 | pages_to_free++; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 733 | } |
| 734 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 735 | // Free pages after top_page. |
| 736 | Page* p = MemoryAllocator::FreePages(top_page->next_page()); |
| 737 | MemoryAllocator::SetNextPage(top_page, p); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 738 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 739 | // Find out how many pages we failed to free and update last_page_. |
| 740 | // Please note pages can only be freed in whole chunks. |
| 741 | last_page_ = top_page; |
| 742 | for (Page* p = top_page->next_page(); p->is_valid(); p = p->next_page()) { |
| 743 | pages_to_free--; |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 744 | last_page_ = p; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 745 | } |
| 746 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 747 | accounting_stats_.ShrinkSpace(pages_to_free * Page::kObjectAreaSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 748 | ASSERT(Capacity() == CountTotalPages() * Page::kObjectAreaSize); |
| 749 | } |
| 750 | |
| 751 | |
| 752 | bool PagedSpace::EnsureCapacity(int capacity) { |
| 753 | if (Capacity() >= capacity) return true; |
| 754 | |
| 755 | // Start from the allocation top and loop to the last page in the space. |
| 756 | Page* last_page = AllocationTopPage(); |
| 757 | Page* next_page = last_page->next_page(); |
| 758 | while (next_page->is_valid()) { |
| 759 | last_page = MemoryAllocator::FindLastPageInSameChunk(next_page); |
| 760 | next_page = last_page->next_page(); |
| 761 | } |
| 762 | |
| 763 | // Expand the space until it has the required capacity or expansion fails. |
| 764 | do { |
| 765 | if (!Expand(last_page)) return false; |
| 766 | ASSERT(last_page->next_page()->is_valid()); |
| 767 | last_page = |
| 768 | MemoryAllocator::FindLastPageInSameChunk(last_page->next_page()); |
| 769 | } while (Capacity() < capacity); |
| 770 | |
| 771 | return true; |
| 772 | } |
| 773 | |
| 774 | |
| 775 | #ifdef DEBUG |
| 776 | void PagedSpace::Print() { } |
| 777 | #endif |
| 778 | |
| 779 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 780 | #ifdef DEBUG |
| 781 | // We do not assume that the PageIterator works, because it depends on the |
| 782 | // invariants we are checking during verification. |
| 783 | void PagedSpace::Verify(ObjectVisitor* visitor) { |
| 784 | // The allocation pointer should be valid, and it should be in a page in the |
| 785 | // space. |
| 786 | ASSERT(allocation_info_.VerifyPagedAllocation()); |
| 787 | Page* top_page = Page::FromAllocationTop(allocation_info_.top); |
| 788 | ASSERT(MemoryAllocator::IsPageInSpace(top_page, this)); |
| 789 | |
| 790 | // Loop over all the pages. |
| 791 | bool above_allocation_top = false; |
| 792 | Page* current_page = first_page_; |
| 793 | while (current_page->is_valid()) { |
| 794 | if (above_allocation_top) { |
| 795 | // We don't care what's above the allocation top. |
| 796 | } else { |
| 797 | // Unless this is the last page in the space containing allocated |
| 798 | // objects, the allocation top should be at a constant offset from the |
| 799 | // object area end. |
| 800 | Address top = current_page->AllocationTop(); |
| 801 | if (current_page == top_page) { |
| 802 | ASSERT(top == allocation_info_.top); |
| 803 | // The next page will be above the allocation top. |
| 804 | above_allocation_top = true; |
| 805 | } else { |
| 806 | ASSERT(top == current_page->ObjectAreaEnd() - page_extra_); |
| 807 | } |
| 808 | |
| 809 | // It should be packed with objects from the bottom to the top. |
| 810 | Address current = current_page->ObjectAreaStart(); |
| 811 | while (current < top) { |
| 812 | HeapObject* object = HeapObject::FromAddress(current); |
| 813 | |
| 814 | // The first word should be a map, and we expect all map pointers to |
| 815 | // be in map space. |
| 816 | Map* map = object->map(); |
| 817 | ASSERT(map->IsMap()); |
| 818 | ASSERT(Heap::map_space()->Contains(map)); |
| 819 | |
| 820 | // Perform space-specific object verification. |
| 821 | VerifyObject(object); |
| 822 | |
| 823 | // The object itself should look OK. |
| 824 | object->Verify(); |
| 825 | |
| 826 | // All the interior pointers should be contained in the heap and |
| 827 | // have their remembered set bits set if required as determined |
| 828 | // by the visitor. |
| 829 | int size = object->Size(); |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame^] | 830 | object->IterateBody(map->instance_type(), size, visitor); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 831 | |
| 832 | current += size; |
| 833 | } |
| 834 | |
| 835 | // The allocation pointer should not be in the middle of an object. |
| 836 | ASSERT(current == top); |
| 837 | } |
| 838 | |
| 839 | current_page = current_page->next_page(); |
| 840 | } |
| 841 | } |
| 842 | #endif |
| 843 | |
| 844 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 845 | // ----------------------------------------------------------------------------- |
| 846 | // NewSpace implementation |
| 847 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 848 | |
| 849 | bool NewSpace::Setup(Address start, int size) { |
| 850 | // Setup new space based on the preallocated memory block defined by |
| 851 | // start and size. The provided space is divided into two semi-spaces. |
| 852 | // To support fast containment testing in the new space, the size of |
| 853 | // this chunk must be a power of two and it must be aligned to its size. |
| 854 | int initial_semispace_capacity = Heap::InitialSemiSpaceSize(); |
| 855 | int maximum_semispace_capacity = Heap::SemiSpaceSize(); |
| 856 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 857 | ASSERT(initial_semispace_capacity <= maximum_semispace_capacity); |
| 858 | ASSERT(IsPowerOf2(maximum_semispace_capacity)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 859 | |
| 860 | // Allocate and setup the histogram arrays if necessary. |
| 861 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 862 | allocated_histogram_ = NewArray<HistogramInfo>(LAST_TYPE + 1); |
| 863 | promoted_histogram_ = NewArray<HistogramInfo>(LAST_TYPE + 1); |
| 864 | |
| 865 | #define SET_NAME(name) allocated_histogram_[name].set_name(#name); \ |
| 866 | promoted_histogram_[name].set_name(#name); |
| 867 | INSTANCE_TYPE_LIST(SET_NAME) |
| 868 | #undef SET_NAME |
| 869 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 870 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 871 | ASSERT(size == 2 * maximum_semispace_capacity); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 872 | ASSERT(IsAddressAligned(start, size, 0)); |
| 873 | |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 874 | if (!to_space_.Setup(start, |
| 875 | initial_semispace_capacity, |
| 876 | maximum_semispace_capacity)) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 877 | return false; |
| 878 | } |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 879 | if (!from_space_.Setup(start + maximum_semispace_capacity, |
| 880 | initial_semispace_capacity, |
| 881 | maximum_semispace_capacity)) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 882 | return false; |
| 883 | } |
| 884 | |
| 885 | start_ = start; |
| 886 | address_mask_ = ~(size - 1); |
| 887 | object_mask_ = address_mask_ | kHeapObjectTag; |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 888 | object_expected_ = reinterpret_cast<uintptr_t>(start) | kHeapObjectTag; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 889 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 890 | allocation_info_.top = to_space_.low(); |
| 891 | allocation_info_.limit = to_space_.high(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 892 | mc_forwarding_info_.top = NULL; |
| 893 | mc_forwarding_info_.limit = NULL; |
| 894 | |
| 895 | ASSERT_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_); |
| 896 | return true; |
| 897 | } |
| 898 | |
| 899 | |
| 900 | void NewSpace::TearDown() { |
| 901 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 902 | if (allocated_histogram_) { |
| 903 | DeleteArray(allocated_histogram_); |
| 904 | allocated_histogram_ = NULL; |
| 905 | } |
| 906 | if (promoted_histogram_) { |
| 907 | DeleteArray(promoted_histogram_); |
| 908 | promoted_histogram_ = NULL; |
| 909 | } |
| 910 | #endif |
| 911 | |
| 912 | start_ = NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 913 | allocation_info_.top = NULL; |
| 914 | allocation_info_.limit = NULL; |
| 915 | mc_forwarding_info_.top = NULL; |
| 916 | mc_forwarding_info_.limit = NULL; |
| 917 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 918 | to_space_.TearDown(); |
| 919 | from_space_.TearDown(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 923 | #ifdef ENABLE_HEAP_PROTECTION |
| 924 | |
| 925 | void NewSpace::Protect() { |
| 926 | MemoryAllocator::Protect(ToSpaceLow(), Capacity()); |
| 927 | MemoryAllocator::Protect(FromSpaceLow(), Capacity()); |
| 928 | } |
| 929 | |
| 930 | |
| 931 | void NewSpace::Unprotect() { |
| 932 | MemoryAllocator::Unprotect(ToSpaceLow(), Capacity(), |
| 933 | to_space_.executable()); |
| 934 | MemoryAllocator::Unprotect(FromSpaceLow(), Capacity(), |
| 935 | from_space_.executable()); |
| 936 | } |
| 937 | |
| 938 | #endif |
| 939 | |
| 940 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 941 | void NewSpace::Flip() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 942 | SemiSpace tmp = from_space_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 943 | from_space_ = to_space_; |
| 944 | to_space_ = tmp; |
| 945 | } |
| 946 | |
| 947 | |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame] | 948 | void NewSpace::Grow() { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 949 | ASSERT(Capacity() < MaximumCapacity()); |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame] | 950 | if (to_space_.Grow()) { |
| 951 | // Only grow from space if we managed to grow to space. |
| 952 | if (!from_space_.Grow()) { |
| 953 | // If we managed to grow to space but couldn't grow from space, |
| 954 | // attempt to shrink to space. |
| 955 | if (!to_space_.ShrinkTo(from_space_.Capacity())) { |
| 956 | // We are in an inconsistent state because we could not |
| 957 | // commit/uncommit memory from new space. |
| 958 | V8::FatalProcessOutOfMemory("Failed to grow new space."); |
| 959 | } |
| 960 | } |
| 961 | } |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 962 | allocation_info_.limit = to_space_.high(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 963 | ASSERT_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_); |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | |
| 967 | void NewSpace::Shrink() { |
| 968 | int new_capacity = Max(InitialCapacity(), 2 * Size()); |
| 969 | int rounded_new_capacity = RoundUp(new_capacity, OS::AllocateAlignment()); |
| 970 | if (rounded_new_capacity < Capacity() && |
| 971 | to_space_.ShrinkTo(rounded_new_capacity)) { |
| 972 | // Only shrink from space if we managed to shrink to space. |
| 973 | if (!from_space_.ShrinkTo(rounded_new_capacity)) { |
| 974 | // If we managed to shrink to space but couldn't shrink from |
| 975 | // space, attempt to grow to space again. |
| 976 | if (!to_space_.GrowTo(from_space_.Capacity())) { |
| 977 | // We are in an inconsistent state because we could not |
| 978 | // commit/uncommit memory from new space. |
| 979 | V8::FatalProcessOutOfMemory("Failed to shrink new space."); |
| 980 | } |
| 981 | } |
| 982 | } |
| 983 | allocation_info_.limit = to_space_.high(); |
| 984 | ASSERT_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | |
| 988 | void NewSpace::ResetAllocationInfo() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 989 | allocation_info_.top = to_space_.low(); |
| 990 | allocation_info_.limit = to_space_.high(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 991 | ASSERT_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_); |
| 992 | } |
| 993 | |
| 994 | |
| 995 | void NewSpace::MCResetRelocationInfo() { |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 996 | mc_forwarding_info_.top = from_space_.low(); |
| 997 | mc_forwarding_info_.limit = from_space_.high(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 998 | ASSERT_SEMISPACE_ALLOCATION_INFO(mc_forwarding_info_, from_space_); |
| 999 | } |
| 1000 | |
| 1001 | |
| 1002 | void NewSpace::MCCommitRelocationInfo() { |
| 1003 | // Assumes that the spaces have been flipped so that mc_forwarding_info_ is |
| 1004 | // valid allocation info for the to space. |
| 1005 | allocation_info_.top = mc_forwarding_info_.top; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1006 | allocation_info_.limit = to_space_.high(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1007 | ASSERT_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_); |
| 1008 | } |
| 1009 | |
| 1010 | |
| 1011 | #ifdef DEBUG |
| 1012 | // We do not use the SemispaceIterator because verification doesn't assume |
| 1013 | // that it works (it depends on the invariants we are checking). |
| 1014 | void NewSpace::Verify() { |
| 1015 | // The allocation pointer should be in the space or at the very end. |
| 1016 | ASSERT_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_); |
| 1017 | |
| 1018 | // There should be objects packed in from the low address up to the |
| 1019 | // allocation pointer. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1020 | Address current = to_space_.low(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1021 | while (current < top()) { |
| 1022 | HeapObject* object = HeapObject::FromAddress(current); |
| 1023 | |
| 1024 | // The first word should be a map, and we expect all map pointers to |
| 1025 | // be in map space. |
| 1026 | Map* map = object->map(); |
| 1027 | ASSERT(map->IsMap()); |
| 1028 | ASSERT(Heap::map_space()->Contains(map)); |
| 1029 | |
| 1030 | // The object should not be code or a map. |
| 1031 | ASSERT(!object->IsMap()); |
| 1032 | ASSERT(!object->IsCode()); |
| 1033 | |
| 1034 | // The object itself should look OK. |
| 1035 | object->Verify(); |
| 1036 | |
| 1037 | // All the interior pointers should be contained in the heap. |
| 1038 | VerifyPointersVisitor visitor; |
| 1039 | int size = object->Size(); |
| 1040 | object->IterateBody(map->instance_type(), size, &visitor); |
| 1041 | |
| 1042 | current += size; |
| 1043 | } |
| 1044 | |
| 1045 | // The allocation pointer should not be in the middle of an object. |
| 1046 | ASSERT(current == top()); |
| 1047 | } |
| 1048 | #endif |
| 1049 | |
| 1050 | |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 1051 | bool SemiSpace::Commit() { |
| 1052 | ASSERT(!is_committed()); |
| 1053 | if (!MemoryAllocator::CommitBlock(start_, capacity_, executable())) { |
| 1054 | return false; |
| 1055 | } |
| 1056 | committed_ = true; |
| 1057 | return true; |
| 1058 | } |
| 1059 | |
| 1060 | |
| 1061 | bool SemiSpace::Uncommit() { |
| 1062 | ASSERT(is_committed()); |
| 1063 | if (!MemoryAllocator::UncommitBlock(start_, capacity_)) { |
| 1064 | return false; |
| 1065 | } |
| 1066 | committed_ = false; |
| 1067 | return true; |
| 1068 | } |
| 1069 | |
| 1070 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1071 | // ----------------------------------------------------------------------------- |
| 1072 | // SemiSpace implementation |
| 1073 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1074 | bool SemiSpace::Setup(Address start, |
| 1075 | int initial_capacity, |
| 1076 | int maximum_capacity) { |
| 1077 | // Creates a space in the young generation. The constructor does not |
| 1078 | // allocate memory from the OS. A SemiSpace is given a contiguous chunk of |
| 1079 | // memory of size 'capacity' when set up, and does not grow or shrink |
| 1080 | // otherwise. In the mark-compact collector, the memory region of the from |
| 1081 | // space is used as the marking stack. It requires contiguous memory |
| 1082 | // addresses. |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame] | 1083 | initial_capacity_ = initial_capacity; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1084 | capacity_ = initial_capacity; |
| 1085 | maximum_capacity_ = maximum_capacity; |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 1086 | committed_ = false; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1087 | |
| 1088 | start_ = start; |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1089 | address_mask_ = ~(maximum_capacity - 1); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1090 | object_mask_ = address_mask_ | kHeapObjectTag; |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1091 | object_expected_ = reinterpret_cast<uintptr_t>(start) | kHeapObjectTag; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1092 | age_mark_ = start_; |
ager@chromium.org | add848f | 2009-08-13 12:44:13 +0000 | [diff] [blame] | 1093 | |
| 1094 | return Commit(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1095 | } |
| 1096 | |
| 1097 | |
| 1098 | void SemiSpace::TearDown() { |
| 1099 | start_ = NULL; |
| 1100 | capacity_ = 0; |
| 1101 | } |
| 1102 | |
| 1103 | |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 1104 | bool SemiSpace::Grow() { |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 1105 | // Double the semispace size but only up to maximum capacity. |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1106 | int maximum_extra = maximum_capacity_ - capacity_; |
sgjesse@chromium.org | c81c894 | 2009-08-21 10:54:26 +0000 | [diff] [blame] | 1107 | int extra = Min(RoundUp(capacity_, OS::AllocateAlignment()), |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 1108 | maximum_extra); |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 1109 | if (!MemoryAllocator::CommitBlock(high(), extra, executable())) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1110 | return false; |
| 1111 | } |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 1112 | capacity_ += extra; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1113 | return true; |
| 1114 | } |
| 1115 | |
| 1116 | |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame] | 1117 | bool SemiSpace::GrowTo(int new_capacity) { |
| 1118 | ASSERT(new_capacity <= maximum_capacity_); |
| 1119 | ASSERT(new_capacity > capacity_); |
| 1120 | size_t delta = new_capacity - capacity_; |
| 1121 | ASSERT(IsAligned(delta, OS::AllocateAlignment())); |
| 1122 | if (!MemoryAllocator::CommitBlock(high(), delta, executable())) { |
| 1123 | return false; |
| 1124 | } |
| 1125 | capacity_ = new_capacity; |
| 1126 | return true; |
| 1127 | } |
| 1128 | |
| 1129 | |
| 1130 | bool SemiSpace::ShrinkTo(int new_capacity) { |
| 1131 | ASSERT(new_capacity >= initial_capacity_); |
| 1132 | ASSERT(new_capacity < capacity_); |
| 1133 | size_t delta = capacity_ - new_capacity; |
| 1134 | ASSERT(IsAligned(delta, OS::AllocateAlignment())); |
| 1135 | if (!MemoryAllocator::UncommitBlock(high() - delta, delta)) { |
| 1136 | return false; |
| 1137 | } |
| 1138 | capacity_ = new_capacity; |
| 1139 | return true; |
| 1140 | } |
| 1141 | |
| 1142 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1143 | #ifdef DEBUG |
| 1144 | void SemiSpace::Print() { } |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1145 | |
| 1146 | |
| 1147 | void SemiSpace::Verify() { } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1148 | #endif |
| 1149 | |
| 1150 | |
| 1151 | // ----------------------------------------------------------------------------- |
| 1152 | // SemiSpaceIterator implementation. |
| 1153 | SemiSpaceIterator::SemiSpaceIterator(NewSpace* space) { |
| 1154 | Initialize(space, space->bottom(), space->top(), NULL); |
| 1155 | } |
| 1156 | |
| 1157 | |
| 1158 | SemiSpaceIterator::SemiSpaceIterator(NewSpace* space, |
| 1159 | HeapObjectCallback size_func) { |
| 1160 | Initialize(space, space->bottom(), space->top(), size_func); |
| 1161 | } |
| 1162 | |
| 1163 | |
| 1164 | SemiSpaceIterator::SemiSpaceIterator(NewSpace* space, Address start) { |
| 1165 | Initialize(space, start, space->top(), NULL); |
| 1166 | } |
| 1167 | |
| 1168 | |
| 1169 | void SemiSpaceIterator::Initialize(NewSpace* space, Address start, |
| 1170 | Address end, |
| 1171 | HeapObjectCallback size_func) { |
| 1172 | ASSERT(space->ToSpaceContains(start)); |
| 1173 | ASSERT(space->ToSpaceLow() <= end |
| 1174 | && end <= space->ToSpaceHigh()); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 1175 | space_ = &space->to_space_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1176 | current_ = start; |
| 1177 | limit_ = end; |
| 1178 | size_func_ = size_func; |
| 1179 | } |
| 1180 | |
| 1181 | |
| 1182 | #ifdef DEBUG |
| 1183 | // A static array of histogram info for each type. |
| 1184 | static HistogramInfo heap_histograms[LAST_TYPE+1]; |
| 1185 | static JSObject::SpillInformation js_spill_information; |
| 1186 | |
| 1187 | // heap_histograms is shared, always clear it before using it. |
| 1188 | static void ClearHistograms() { |
| 1189 | // We reset the name each time, though it hasn't changed. |
| 1190 | #define DEF_TYPE_NAME(name) heap_histograms[name].set_name(#name); |
| 1191 | INSTANCE_TYPE_LIST(DEF_TYPE_NAME) |
| 1192 | #undef DEF_TYPE_NAME |
| 1193 | |
| 1194 | #define CLEAR_HISTOGRAM(name) heap_histograms[name].clear(); |
| 1195 | INSTANCE_TYPE_LIST(CLEAR_HISTOGRAM) |
| 1196 | #undef CLEAR_HISTOGRAM |
| 1197 | |
| 1198 | js_spill_information.Clear(); |
| 1199 | } |
| 1200 | |
| 1201 | |
| 1202 | static int code_kind_statistics[Code::NUMBER_OF_KINDS]; |
| 1203 | |
| 1204 | |
| 1205 | static void ClearCodeKindStatistics() { |
| 1206 | for (int i = 0; i < Code::NUMBER_OF_KINDS; i++) { |
| 1207 | code_kind_statistics[i] = 0; |
| 1208 | } |
| 1209 | } |
| 1210 | |
| 1211 | |
| 1212 | static void ReportCodeKindStatistics() { |
| 1213 | const char* table[Code::NUMBER_OF_KINDS]; |
| 1214 | |
| 1215 | #define CASE(name) \ |
| 1216 | case Code::name: table[Code::name] = #name; \ |
| 1217 | break |
| 1218 | |
| 1219 | for (int i = 0; i < Code::NUMBER_OF_KINDS; i++) { |
| 1220 | switch (static_cast<Code::Kind>(i)) { |
| 1221 | CASE(FUNCTION); |
| 1222 | CASE(STUB); |
| 1223 | CASE(BUILTIN); |
| 1224 | CASE(LOAD_IC); |
| 1225 | CASE(KEYED_LOAD_IC); |
| 1226 | CASE(STORE_IC); |
| 1227 | CASE(KEYED_STORE_IC); |
| 1228 | CASE(CALL_IC); |
| 1229 | } |
| 1230 | } |
| 1231 | |
| 1232 | #undef CASE |
| 1233 | |
| 1234 | PrintF("\n Code kind histograms: \n"); |
| 1235 | for (int i = 0; i < Code::NUMBER_OF_KINDS; i++) { |
| 1236 | if (code_kind_statistics[i] > 0) { |
| 1237 | PrintF(" %-20s: %10d bytes\n", table[i], code_kind_statistics[i]); |
| 1238 | } |
| 1239 | } |
| 1240 | PrintF("\n"); |
| 1241 | } |
| 1242 | |
| 1243 | |
| 1244 | static int CollectHistogramInfo(HeapObject* obj) { |
| 1245 | InstanceType type = obj->map()->instance_type(); |
| 1246 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 1247 | ASSERT(heap_histograms[type].name() != NULL); |
| 1248 | heap_histograms[type].increment_number(1); |
| 1249 | heap_histograms[type].increment_bytes(obj->Size()); |
| 1250 | |
| 1251 | if (FLAG_collect_heap_spill_statistics && obj->IsJSObject()) { |
| 1252 | JSObject::cast(obj)->IncrementSpillStatistics(&js_spill_information); |
| 1253 | } |
| 1254 | |
| 1255 | return obj->Size(); |
| 1256 | } |
| 1257 | |
| 1258 | |
| 1259 | static void ReportHistogram(bool print_spill) { |
| 1260 | PrintF("\n Object Histogram:\n"); |
| 1261 | for (int i = 0; i <= LAST_TYPE; i++) { |
| 1262 | if (heap_histograms[i].number() > 0) { |
| 1263 | PrintF(" %-33s%10d (%10d bytes)\n", |
| 1264 | heap_histograms[i].name(), |
| 1265 | heap_histograms[i].number(), |
| 1266 | heap_histograms[i].bytes()); |
| 1267 | } |
| 1268 | } |
| 1269 | PrintF("\n"); |
| 1270 | |
| 1271 | // Summarize string types. |
| 1272 | int string_number = 0; |
| 1273 | int string_bytes = 0; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1274 | #define INCREMENT(type, size, name, camel_name) \ |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1275 | string_number += heap_histograms[type].number(); \ |
| 1276 | string_bytes += heap_histograms[type].bytes(); |
| 1277 | STRING_TYPE_LIST(INCREMENT) |
| 1278 | #undef INCREMENT |
| 1279 | if (string_number > 0) { |
| 1280 | PrintF(" %-33s%10d (%10d bytes)\n\n", "STRING_TYPE", string_number, |
| 1281 | string_bytes); |
| 1282 | } |
| 1283 | |
| 1284 | if (FLAG_collect_heap_spill_statistics && print_spill) { |
| 1285 | js_spill_information.Print(); |
| 1286 | } |
| 1287 | } |
| 1288 | #endif // DEBUG |
| 1289 | |
| 1290 | |
| 1291 | // Support for statistics gathering for --heap-stats and --log-gc. |
| 1292 | #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 1293 | void NewSpace::ClearHistograms() { |
| 1294 | for (int i = 0; i <= LAST_TYPE; i++) { |
| 1295 | allocated_histogram_[i].clear(); |
| 1296 | promoted_histogram_[i].clear(); |
| 1297 | } |
| 1298 | } |
| 1299 | |
| 1300 | // Because the copying collector does not touch garbage objects, we iterate |
| 1301 | // the new space before a collection to get a histogram of allocated objects. |
| 1302 | // This only happens (1) when compiled with DEBUG and the --heap-stats flag is |
| 1303 | // set, or when compiled with ENABLE_LOGGING_AND_PROFILING and the --log-gc |
| 1304 | // flag is set. |
| 1305 | void NewSpace::CollectStatistics() { |
| 1306 | ClearHistograms(); |
| 1307 | SemiSpaceIterator it(this); |
| 1308 | while (it.has_next()) RecordAllocation(it.next()); |
| 1309 | } |
| 1310 | |
| 1311 | |
| 1312 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 1313 | static void DoReportStatistics(HistogramInfo* info, const char* description) { |
| 1314 | LOG(HeapSampleBeginEvent("NewSpace", description)); |
| 1315 | // Lump all the string types together. |
| 1316 | int string_number = 0; |
| 1317 | int string_bytes = 0; |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1318 | #define INCREMENT(type, size, name, camel_name) \ |
| 1319 | string_number += info[type].number(); \ |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1320 | string_bytes += info[type].bytes(); |
| 1321 | STRING_TYPE_LIST(INCREMENT) |
| 1322 | #undef INCREMENT |
| 1323 | if (string_number > 0) { |
| 1324 | LOG(HeapSampleItemEvent("STRING_TYPE", string_number, string_bytes)); |
| 1325 | } |
| 1326 | |
| 1327 | // Then do the other types. |
| 1328 | for (int i = FIRST_NONSTRING_TYPE; i <= LAST_TYPE; ++i) { |
| 1329 | if (info[i].number() > 0) { |
| 1330 | LOG(HeapSampleItemEvent(info[i].name(), info[i].number(), |
| 1331 | info[i].bytes())); |
| 1332 | } |
| 1333 | } |
| 1334 | LOG(HeapSampleEndEvent("NewSpace", description)); |
| 1335 | } |
| 1336 | #endif // ENABLE_LOGGING_AND_PROFILING |
| 1337 | |
| 1338 | |
| 1339 | void NewSpace::ReportStatistics() { |
| 1340 | #ifdef DEBUG |
| 1341 | if (FLAG_heap_stats) { |
| 1342 | float pct = static_cast<float>(Available()) / Capacity(); |
| 1343 | PrintF(" capacity: %d, available: %d, %%%d\n", |
| 1344 | Capacity(), Available(), static_cast<int>(pct*100)); |
| 1345 | PrintF("\n Object Histogram:\n"); |
| 1346 | for (int i = 0; i <= LAST_TYPE; i++) { |
| 1347 | if (allocated_histogram_[i].number() > 0) { |
| 1348 | PrintF(" %-33s%10d (%10d bytes)\n", |
| 1349 | allocated_histogram_[i].name(), |
| 1350 | allocated_histogram_[i].number(), |
| 1351 | allocated_histogram_[i].bytes()); |
| 1352 | } |
| 1353 | } |
| 1354 | PrintF("\n"); |
| 1355 | } |
| 1356 | #endif // DEBUG |
| 1357 | |
| 1358 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 1359 | if (FLAG_log_gc) { |
| 1360 | DoReportStatistics(allocated_histogram_, "allocated"); |
| 1361 | DoReportStatistics(promoted_histogram_, "promoted"); |
| 1362 | } |
| 1363 | #endif // ENABLE_LOGGING_AND_PROFILING |
| 1364 | } |
| 1365 | |
| 1366 | |
| 1367 | void NewSpace::RecordAllocation(HeapObject* obj) { |
| 1368 | InstanceType type = obj->map()->instance_type(); |
| 1369 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 1370 | allocated_histogram_[type].increment_number(1); |
| 1371 | allocated_histogram_[type].increment_bytes(obj->Size()); |
| 1372 | } |
| 1373 | |
| 1374 | |
| 1375 | void NewSpace::RecordPromotion(HeapObject* obj) { |
| 1376 | InstanceType type = obj->map()->instance_type(); |
| 1377 | ASSERT(0 <= type && type <= LAST_TYPE); |
| 1378 | promoted_histogram_[type].increment_number(1); |
| 1379 | promoted_histogram_[type].increment_bytes(obj->Size()); |
| 1380 | } |
| 1381 | #endif // defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
| 1382 | |
| 1383 | |
| 1384 | // ----------------------------------------------------------------------------- |
| 1385 | // Free lists for old object spaces implementation |
| 1386 | |
| 1387 | void FreeListNode::set_size(int size_in_bytes) { |
| 1388 | ASSERT(size_in_bytes > 0); |
| 1389 | ASSERT(IsAligned(size_in_bytes, kPointerSize)); |
| 1390 | |
| 1391 | // We write a map and possibly size information to the block. If the block |
| 1392 | // is big enough to be a ByteArray with at least one extra word (the next |
| 1393 | // pointer), we set its map to be the byte array map and its size to an |
| 1394 | // appropriate array length for the desired size from HeapObject::Size(). |
| 1395 | // If the block is too small (eg, one or two words), to hold both a size |
| 1396 | // field and a next pointer, we give it a filler map that gives it the |
| 1397 | // correct size. |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1398 | if (size_in_bytes > ByteArray::kAlignedSize) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1399 | set_map(Heap::raw_unchecked_byte_array_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1400 | ByteArray::cast(this)->set_length(ByteArray::LengthFor(size_in_bytes)); |
| 1401 | } else if (size_in_bytes == kPointerSize) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1402 | set_map(Heap::raw_unchecked_one_pointer_filler_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1403 | } else if (size_in_bytes == 2 * kPointerSize) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1404 | set_map(Heap::raw_unchecked_two_pointer_filler_map()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1405 | } else { |
| 1406 | UNREACHABLE(); |
| 1407 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1408 | ASSERT(Size() == size_in_bytes); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1409 | } |
| 1410 | |
| 1411 | |
| 1412 | Address FreeListNode::next() { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1413 | ASSERT(map() == Heap::raw_unchecked_byte_array_map() || |
| 1414 | map() == Heap::raw_unchecked_two_pointer_filler_map()); |
| 1415 | if (map() == Heap::raw_unchecked_byte_array_map()) { |
| 1416 | ASSERT(Size() >= kNextOffset + kPointerSize); |
| 1417 | return Memory::Address_at(address() + kNextOffset); |
| 1418 | } else { |
| 1419 | return Memory::Address_at(address() + kPointerSize); |
| 1420 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1421 | } |
| 1422 | |
| 1423 | |
| 1424 | void FreeListNode::set_next(Address next) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1425 | ASSERT(map() == Heap::raw_unchecked_byte_array_map() || |
| 1426 | map() == Heap::raw_unchecked_two_pointer_filler_map()); |
| 1427 | if (map() == Heap::raw_unchecked_byte_array_map()) { |
| 1428 | ASSERT(Size() >= kNextOffset + kPointerSize); |
| 1429 | Memory::Address_at(address() + kNextOffset) = next; |
| 1430 | } else { |
| 1431 | Memory::Address_at(address() + kPointerSize) = next; |
| 1432 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1433 | } |
| 1434 | |
| 1435 | |
| 1436 | OldSpaceFreeList::OldSpaceFreeList(AllocationSpace owner) : owner_(owner) { |
| 1437 | Reset(); |
| 1438 | } |
| 1439 | |
| 1440 | |
| 1441 | void OldSpaceFreeList::Reset() { |
| 1442 | available_ = 0; |
| 1443 | for (int i = 0; i < kFreeListsLength; i++) { |
| 1444 | free_[i].head_node_ = NULL; |
| 1445 | } |
| 1446 | needs_rebuild_ = false; |
| 1447 | finger_ = kHead; |
| 1448 | free_[kHead].next_size_ = kEnd; |
| 1449 | } |
| 1450 | |
| 1451 | |
| 1452 | void OldSpaceFreeList::RebuildSizeList() { |
| 1453 | ASSERT(needs_rebuild_); |
| 1454 | int cur = kHead; |
| 1455 | for (int i = cur + 1; i < kFreeListsLength; i++) { |
| 1456 | if (free_[i].head_node_ != NULL) { |
| 1457 | free_[cur].next_size_ = i; |
| 1458 | cur = i; |
| 1459 | } |
| 1460 | } |
| 1461 | free_[cur].next_size_ = kEnd; |
| 1462 | needs_rebuild_ = false; |
| 1463 | } |
| 1464 | |
| 1465 | |
| 1466 | int OldSpaceFreeList::Free(Address start, int size_in_bytes) { |
| 1467 | #ifdef DEBUG |
| 1468 | for (int i = 0; i < size_in_bytes; i += kPointerSize) { |
| 1469 | Memory::Address_at(start + i) = kZapValue; |
| 1470 | } |
| 1471 | #endif |
| 1472 | FreeListNode* node = FreeListNode::FromAddress(start); |
| 1473 | node->set_size(size_in_bytes); |
| 1474 | |
sgjesse@chromium.org | 755c5b1 | 2009-05-29 11:04:38 +0000 | [diff] [blame] | 1475 | // We don't use the freelists in compacting mode. This makes it more like a |
| 1476 | // GC that only has mark-sweep-compact and doesn't have a mark-sweep |
| 1477 | // collector. |
| 1478 | if (FLAG_always_compact) { |
| 1479 | return size_in_bytes; |
| 1480 | } |
| 1481 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1482 | // Early return to drop too-small blocks on the floor (one or two word |
| 1483 | // blocks cannot hold a map pointer, a size field, and a pointer to the |
| 1484 | // next block in the free list). |
| 1485 | if (size_in_bytes < kMinBlockSize) { |
| 1486 | return size_in_bytes; |
| 1487 | } |
| 1488 | |
| 1489 | // Insert other blocks at the head of an exact free list. |
| 1490 | int index = size_in_bytes >> kPointerSizeLog2; |
| 1491 | node->set_next(free_[index].head_node_); |
| 1492 | free_[index].head_node_ = node->address(); |
| 1493 | available_ += size_in_bytes; |
| 1494 | needs_rebuild_ = true; |
| 1495 | return 0; |
| 1496 | } |
| 1497 | |
| 1498 | |
| 1499 | Object* OldSpaceFreeList::Allocate(int size_in_bytes, int* wasted_bytes) { |
| 1500 | ASSERT(0 < size_in_bytes); |
| 1501 | ASSERT(size_in_bytes <= kMaxBlockSize); |
| 1502 | ASSERT(IsAligned(size_in_bytes, kPointerSize)); |
| 1503 | |
| 1504 | if (needs_rebuild_) RebuildSizeList(); |
| 1505 | int index = size_in_bytes >> kPointerSizeLog2; |
| 1506 | // Check for a perfect fit. |
| 1507 | if (free_[index].head_node_ != NULL) { |
| 1508 | FreeListNode* node = FreeListNode::FromAddress(free_[index].head_node_); |
| 1509 | // If this was the last block of its size, remove the size. |
| 1510 | if ((free_[index].head_node_ = node->next()) == NULL) RemoveSize(index); |
| 1511 | available_ -= size_in_bytes; |
| 1512 | *wasted_bytes = 0; |
sgjesse@chromium.org | 755c5b1 | 2009-05-29 11:04:38 +0000 | [diff] [blame] | 1513 | ASSERT(!FLAG_always_compact); // We only use the freelists with mark-sweep. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1514 | return node; |
| 1515 | } |
| 1516 | // Search the size list for the best fit. |
| 1517 | int prev = finger_ < index ? finger_ : kHead; |
| 1518 | int cur = FindSize(index, &prev); |
| 1519 | ASSERT(index < cur); |
| 1520 | if (cur == kEnd) { |
| 1521 | // No large enough size in list. |
| 1522 | *wasted_bytes = 0; |
| 1523 | return Failure::RetryAfterGC(size_in_bytes, owner_); |
| 1524 | } |
sgjesse@chromium.org | 755c5b1 | 2009-05-29 11:04:38 +0000 | [diff] [blame] | 1525 | ASSERT(!FLAG_always_compact); // We only use the freelists with mark-sweep. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1526 | int rem = cur - index; |
| 1527 | int rem_bytes = rem << kPointerSizeLog2; |
| 1528 | FreeListNode* cur_node = FreeListNode::FromAddress(free_[cur].head_node_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1529 | ASSERT(cur_node->Size() == (cur << kPointerSizeLog2)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1530 | FreeListNode* rem_node = FreeListNode::FromAddress(free_[cur].head_node_ + |
| 1531 | size_in_bytes); |
| 1532 | // Distinguish the cases prev < rem < cur and rem <= prev < cur |
| 1533 | // to avoid many redundant tests and calls to Insert/RemoveSize. |
| 1534 | if (prev < rem) { |
| 1535 | // Simple case: insert rem between prev and cur. |
| 1536 | finger_ = prev; |
| 1537 | free_[prev].next_size_ = rem; |
| 1538 | // If this was the last block of size cur, remove the size. |
| 1539 | if ((free_[cur].head_node_ = cur_node->next()) == NULL) { |
| 1540 | free_[rem].next_size_ = free_[cur].next_size_; |
| 1541 | } else { |
| 1542 | free_[rem].next_size_ = cur; |
| 1543 | } |
| 1544 | // Add the remainder block. |
| 1545 | rem_node->set_size(rem_bytes); |
| 1546 | rem_node->set_next(free_[rem].head_node_); |
| 1547 | free_[rem].head_node_ = rem_node->address(); |
| 1548 | } else { |
| 1549 | // If this was the last block of size cur, remove the size. |
| 1550 | if ((free_[cur].head_node_ = cur_node->next()) == NULL) { |
| 1551 | finger_ = prev; |
| 1552 | free_[prev].next_size_ = free_[cur].next_size_; |
| 1553 | } |
| 1554 | if (rem_bytes < kMinBlockSize) { |
| 1555 | // Too-small remainder is wasted. |
| 1556 | rem_node->set_size(rem_bytes); |
| 1557 | available_ -= size_in_bytes + rem_bytes; |
| 1558 | *wasted_bytes = rem_bytes; |
| 1559 | return cur_node; |
| 1560 | } |
| 1561 | // Add the remainder block and, if needed, insert its size. |
| 1562 | rem_node->set_size(rem_bytes); |
| 1563 | rem_node->set_next(free_[rem].head_node_); |
| 1564 | free_[rem].head_node_ = rem_node->address(); |
| 1565 | if (rem_node->next() == NULL) InsertSize(rem); |
| 1566 | } |
| 1567 | available_ -= size_in_bytes; |
| 1568 | *wasted_bytes = 0; |
| 1569 | return cur_node; |
| 1570 | } |
| 1571 | |
| 1572 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1573 | #ifdef DEBUG |
| 1574 | bool OldSpaceFreeList::Contains(FreeListNode* node) { |
| 1575 | for (int i = 0; i < kFreeListsLength; i++) { |
| 1576 | Address cur_addr = free_[i].head_node_; |
| 1577 | while (cur_addr != NULL) { |
| 1578 | FreeListNode* cur_node = FreeListNode::FromAddress(cur_addr); |
| 1579 | if (cur_node == node) return true; |
| 1580 | cur_addr = cur_node->next(); |
| 1581 | } |
| 1582 | } |
| 1583 | return false; |
| 1584 | } |
| 1585 | #endif |
| 1586 | |
| 1587 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1588 | FixedSizeFreeList::FixedSizeFreeList(AllocationSpace owner, int object_size) |
| 1589 | : owner_(owner), object_size_(object_size) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1590 | Reset(); |
| 1591 | } |
| 1592 | |
| 1593 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1594 | void FixedSizeFreeList::Reset() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1595 | available_ = 0; |
| 1596 | head_ = NULL; |
| 1597 | } |
| 1598 | |
| 1599 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1600 | void FixedSizeFreeList::Free(Address start) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1601 | #ifdef DEBUG |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1602 | for (int i = 0; i < object_size_; i += kPointerSize) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1603 | Memory::Address_at(start + i) = kZapValue; |
| 1604 | } |
| 1605 | #endif |
sgjesse@chromium.org | 755c5b1 | 2009-05-29 11:04:38 +0000 | [diff] [blame] | 1606 | ASSERT(!FLAG_always_compact); // We only use the freelists with mark-sweep. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1607 | FreeListNode* node = FreeListNode::FromAddress(start); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1608 | node->set_size(object_size_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1609 | node->set_next(head_); |
| 1610 | head_ = node->address(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1611 | available_ += object_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1612 | } |
| 1613 | |
| 1614 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1615 | Object* FixedSizeFreeList::Allocate() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1616 | if (head_ == NULL) { |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1617 | return Failure::RetryAfterGC(object_size_, owner_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1618 | } |
| 1619 | |
sgjesse@chromium.org | 755c5b1 | 2009-05-29 11:04:38 +0000 | [diff] [blame] | 1620 | ASSERT(!FLAG_always_compact); // We only use the freelists with mark-sweep. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1621 | FreeListNode* node = FreeListNode::FromAddress(head_); |
| 1622 | head_ = node->next(); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 1623 | available_ -= object_size_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1624 | return node; |
| 1625 | } |
| 1626 | |
| 1627 | |
| 1628 | // ----------------------------------------------------------------------------- |
| 1629 | // OldSpace implementation |
| 1630 | |
| 1631 | void OldSpace::PrepareForMarkCompact(bool will_compact) { |
| 1632 | if (will_compact) { |
| 1633 | // Reset relocation info. During a compacting collection, everything in |
| 1634 | // the space is considered 'available' and we will rediscover live data |
| 1635 | // and waste during the collection. |
| 1636 | MCResetRelocationInfo(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1637 | ASSERT(Available() == Capacity()); |
| 1638 | } else { |
| 1639 | // During a non-compacting collection, everything below the linear |
| 1640 | // allocation pointer is considered allocated (everything above is |
| 1641 | // available) and we will rediscover available and wasted bytes during |
| 1642 | // the collection. |
| 1643 | accounting_stats_.AllocateBytes(free_list_.available()); |
| 1644 | accounting_stats_.FillWastedBytes(Waste()); |
| 1645 | } |
| 1646 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1647 | // Clear the free list before a full GC---it will be rebuilt afterward. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1648 | free_list_.Reset(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1649 | } |
| 1650 | |
| 1651 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1652 | void OldSpace::MCCommitRelocationInfo() { |
| 1653 | // Update fast allocation info. |
| 1654 | allocation_info_.top = mc_forwarding_info_.top; |
| 1655 | allocation_info_.limit = mc_forwarding_info_.limit; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1656 | ASSERT(allocation_info_.VerifyPagedAllocation()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1657 | |
| 1658 | // The space is compacted and we haven't yet built free lists or |
| 1659 | // wasted any space. |
| 1660 | ASSERT(Waste() == 0); |
| 1661 | ASSERT(AvailableFree() == 0); |
| 1662 | |
| 1663 | // Build the free list for the space. |
| 1664 | int computed_size = 0; |
| 1665 | PageIterator it(this, PageIterator::PAGES_USED_BY_MC); |
| 1666 | while (it.has_next()) { |
| 1667 | Page* p = it.next(); |
| 1668 | // Space below the relocation pointer is allocated. |
| 1669 | computed_size += p->mc_relocation_top - p->ObjectAreaStart(); |
| 1670 | if (it.has_next()) { |
| 1671 | // Free the space at the top of the page. We cannot use |
| 1672 | // p->mc_relocation_top after the call to Free (because Free will clear |
| 1673 | // remembered set bits). |
| 1674 | int extra_size = p->ObjectAreaEnd() - p->mc_relocation_top; |
| 1675 | if (extra_size > 0) { |
| 1676 | int wasted_bytes = free_list_.Free(p->mc_relocation_top, extra_size); |
| 1677 | // The bytes we have just "freed" to add to the free list were |
| 1678 | // already accounted as available. |
| 1679 | accounting_stats_.WasteBytes(wasted_bytes); |
| 1680 | } |
| 1681 | } |
| 1682 | } |
| 1683 | |
| 1684 | // Make sure the computed size - based on the used portion of the pages in |
| 1685 | // use - matches the size obtained while computing forwarding addresses. |
| 1686 | ASSERT(computed_size == Size()); |
| 1687 | } |
| 1688 | |
| 1689 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1690 | // Slow case for normal allocation. Try in order: (1) allocate in the next |
| 1691 | // page in the space, (2) allocate off the space's free list, (3) expand the |
| 1692 | // space, (4) fail. |
| 1693 | HeapObject* OldSpace::SlowAllocateRaw(int size_in_bytes) { |
| 1694 | // Linear allocation in this space has failed. If there is another page |
| 1695 | // in the space, move to that page and allocate there. This allocation |
| 1696 | // should succeed (size_in_bytes should not be greater than a page's |
| 1697 | // object area size). |
| 1698 | Page* current_page = TopPageOf(allocation_info_); |
| 1699 | if (current_page->next_page()->is_valid()) { |
| 1700 | return AllocateInNextPage(current_page, size_in_bytes); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1701 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1702 | |
| 1703 | // There is no next page in this space. Try free list allocation. |
| 1704 | int wasted_bytes; |
| 1705 | Object* result = free_list_.Allocate(size_in_bytes, &wasted_bytes); |
| 1706 | accounting_stats_.WasteBytes(wasted_bytes); |
| 1707 | if (!result->IsFailure()) { |
| 1708 | accounting_stats_.AllocateBytes(size_in_bytes); |
| 1709 | return HeapObject::cast(result); |
| 1710 | } |
| 1711 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 1712 | // Free list allocation failed and there is no next page. Fail if we have |
| 1713 | // hit the old generation size limit that should cause a garbage |
| 1714 | // collection. |
| 1715 | if (!Heap::always_allocate() && Heap::OldGenerationAllocationLimitReached()) { |
| 1716 | return NULL; |
| 1717 | } |
| 1718 | |
| 1719 | // Try to expand the space and allocate in the new next page. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1720 | ASSERT(!current_page->next_page()->is_valid()); |
| 1721 | if (Expand(current_page)) { |
| 1722 | return AllocateInNextPage(current_page, size_in_bytes); |
| 1723 | } |
| 1724 | |
| 1725 | // Finally, fail. |
| 1726 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1727 | } |
| 1728 | |
| 1729 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1730 | // Add the block at the top of the page to the space's free list, set the |
| 1731 | // allocation info to the next page (assumed to be one), and allocate |
| 1732 | // linearly there. |
| 1733 | HeapObject* OldSpace::AllocateInNextPage(Page* current_page, |
| 1734 | int size_in_bytes) { |
| 1735 | ASSERT(current_page->next_page()->is_valid()); |
| 1736 | // Add the block at the top of this page to the free list. |
| 1737 | int free_size = current_page->ObjectAreaEnd() - allocation_info_.top; |
| 1738 | if (free_size > 0) { |
| 1739 | int wasted_bytes = free_list_.Free(allocation_info_.top, free_size); |
| 1740 | accounting_stats_.WasteBytes(wasted_bytes); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1741 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 1742 | SetAllocationInfo(&allocation_info_, current_page->next_page()); |
| 1743 | return AllocateLinearly(&allocation_info_, size_in_bytes); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1744 | } |
| 1745 | |
| 1746 | |
| 1747 | #ifdef DEBUG |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1748 | struct CommentStatistic { |
| 1749 | const char* comment; |
| 1750 | int size; |
| 1751 | int count; |
| 1752 | void Clear() { |
| 1753 | comment = NULL; |
| 1754 | size = 0; |
| 1755 | count = 0; |
| 1756 | } |
| 1757 | }; |
| 1758 | |
| 1759 | |
| 1760 | // must be small, since an iteration is used for lookup |
| 1761 | const int kMaxComments = 64; |
| 1762 | static CommentStatistic comments_statistics[kMaxComments+1]; |
| 1763 | |
| 1764 | |
| 1765 | void PagedSpace::ReportCodeStatistics() { |
| 1766 | ReportCodeKindStatistics(); |
| 1767 | PrintF("Code comment statistics (\" [ comment-txt : size/ " |
| 1768 | "count (average)\"):\n"); |
| 1769 | for (int i = 0; i <= kMaxComments; i++) { |
| 1770 | const CommentStatistic& cs = comments_statistics[i]; |
| 1771 | if (cs.size > 0) { |
| 1772 | PrintF(" %-30s: %10d/%6d (%d)\n", cs.comment, cs.size, cs.count, |
| 1773 | cs.size/cs.count); |
| 1774 | } |
| 1775 | } |
| 1776 | PrintF("\n"); |
| 1777 | } |
| 1778 | |
| 1779 | |
| 1780 | void PagedSpace::ResetCodeStatistics() { |
| 1781 | ClearCodeKindStatistics(); |
| 1782 | for (int i = 0; i < kMaxComments; i++) comments_statistics[i].Clear(); |
| 1783 | comments_statistics[kMaxComments].comment = "Unknown"; |
| 1784 | comments_statistics[kMaxComments].size = 0; |
| 1785 | comments_statistics[kMaxComments].count = 0; |
| 1786 | } |
| 1787 | |
| 1788 | |
| 1789 | // Adds comment to 'comment_statistics' table. Performance OK sa long as |
| 1790 | // 'kMaxComments' is small |
| 1791 | static void EnterComment(const char* comment, int delta) { |
| 1792 | // Do not count empty comments |
| 1793 | if (delta <= 0) return; |
| 1794 | CommentStatistic* cs = &comments_statistics[kMaxComments]; |
| 1795 | // Search for a free or matching entry in 'comments_statistics': 'cs' |
| 1796 | // points to result. |
| 1797 | for (int i = 0; i < kMaxComments; i++) { |
| 1798 | if (comments_statistics[i].comment == NULL) { |
| 1799 | cs = &comments_statistics[i]; |
| 1800 | cs->comment = comment; |
| 1801 | break; |
| 1802 | } else if (strcmp(comments_statistics[i].comment, comment) == 0) { |
| 1803 | cs = &comments_statistics[i]; |
| 1804 | break; |
| 1805 | } |
| 1806 | } |
| 1807 | // Update entry for 'comment' |
| 1808 | cs->size += delta; |
| 1809 | cs->count += 1; |
| 1810 | } |
| 1811 | |
| 1812 | |
| 1813 | // Call for each nested comment start (start marked with '[ xxx', end marked |
| 1814 | // with ']'. RelocIterator 'it' must point to a comment reloc info. |
| 1815 | static void CollectCommentStatistics(RelocIterator* it) { |
| 1816 | ASSERT(!it->done()); |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 1817 | ASSERT(it->rinfo()->rmode() == RelocInfo::COMMENT); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1818 | const char* tmp = reinterpret_cast<const char*>(it->rinfo()->data()); |
| 1819 | if (tmp[0] != '[') { |
| 1820 | // Not a nested comment; skip |
| 1821 | return; |
| 1822 | } |
| 1823 | |
| 1824 | // Search for end of nested comment or a new nested comment |
| 1825 | const char* const comment_txt = |
| 1826 | reinterpret_cast<const char*>(it->rinfo()->data()); |
| 1827 | const byte* prev_pc = it->rinfo()->pc(); |
| 1828 | int flat_delta = 0; |
| 1829 | it->next(); |
| 1830 | while (true) { |
| 1831 | // All nested comments must be terminated properly, and therefore exit |
| 1832 | // from loop. |
| 1833 | ASSERT(!it->done()); |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 1834 | if (it->rinfo()->rmode() == RelocInfo::COMMENT) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1835 | const char* const txt = |
| 1836 | reinterpret_cast<const char*>(it->rinfo()->data()); |
| 1837 | flat_delta += it->rinfo()->pc() - prev_pc; |
| 1838 | if (txt[0] == ']') break; // End of nested comment |
| 1839 | // A new comment |
| 1840 | CollectCommentStatistics(it); |
| 1841 | // Skip code that was covered with previous comment |
| 1842 | prev_pc = it->rinfo()->pc(); |
| 1843 | } |
| 1844 | it->next(); |
| 1845 | } |
| 1846 | EnterComment(comment_txt, flat_delta); |
| 1847 | } |
| 1848 | |
| 1849 | |
| 1850 | // Collects code size statistics: |
| 1851 | // - by code kind |
| 1852 | // - by code comment |
| 1853 | void PagedSpace::CollectCodeStatistics() { |
| 1854 | HeapObjectIterator obj_it(this); |
| 1855 | while (obj_it.has_next()) { |
| 1856 | HeapObject* obj = obj_it.next(); |
| 1857 | if (obj->IsCode()) { |
| 1858 | Code* code = Code::cast(obj); |
| 1859 | code_kind_statistics[code->kind()] += code->Size(); |
| 1860 | RelocIterator it(code); |
| 1861 | int delta = 0; |
| 1862 | const byte* prev_pc = code->instruction_start(); |
| 1863 | while (!it.done()) { |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 1864 | if (it.rinfo()->rmode() == RelocInfo::COMMENT) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1865 | delta += it.rinfo()->pc() - prev_pc; |
| 1866 | CollectCommentStatistics(&it); |
| 1867 | prev_pc = it.rinfo()->pc(); |
| 1868 | } |
| 1869 | it.next(); |
| 1870 | } |
| 1871 | |
| 1872 | ASSERT(code->instruction_start() <= prev_pc && |
| 1873 | prev_pc <= code->relocation_start()); |
| 1874 | delta += code->relocation_start() - prev_pc; |
| 1875 | EnterComment("NoComment", delta); |
| 1876 | } |
| 1877 | } |
| 1878 | } |
| 1879 | |
| 1880 | |
| 1881 | void OldSpace::ReportStatistics() { |
| 1882 | int pct = Available() * 100 / Capacity(); |
| 1883 | PrintF(" capacity: %d, waste: %d, available: %d, %%%d\n", |
| 1884 | Capacity(), Waste(), Available(), pct); |
| 1885 | |
| 1886 | // Report remembered set statistics. |
| 1887 | int rset_marked_pointers = 0; |
| 1888 | int rset_marked_arrays = 0; |
| 1889 | int rset_marked_array_elements = 0; |
| 1890 | int cross_gen_pointers = 0; |
| 1891 | int cross_gen_array_elements = 0; |
| 1892 | |
| 1893 | PageIterator page_it(this, PageIterator::PAGES_IN_USE); |
| 1894 | while (page_it.has_next()) { |
| 1895 | Page* p = page_it.next(); |
| 1896 | |
| 1897 | for (Address rset_addr = p->RSetStart(); |
| 1898 | rset_addr < p->RSetEnd(); |
| 1899 | rset_addr += kIntSize) { |
| 1900 | int rset = Memory::int_at(rset_addr); |
| 1901 | if (rset != 0) { |
| 1902 | // Bits were set |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame^] | 1903 | int intoff = rset_addr - p->address() - Page::kRSetOffset; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1904 | int bitoff = 0; |
| 1905 | for (; bitoff < kBitsPerInt; ++bitoff) { |
| 1906 | if ((rset & (1 << bitoff)) != 0) { |
| 1907 | int bitpos = intoff*kBitsPerByte + bitoff; |
| 1908 | Address slot = p->OffsetToAddress(bitpos << kObjectAlignmentBits); |
| 1909 | Object** obj = reinterpret_cast<Object**>(slot); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 1910 | if (*obj == Heap::raw_unchecked_fixed_array_map()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1911 | rset_marked_arrays++; |
| 1912 | FixedArray* fa = FixedArray::cast(HeapObject::FromAddress(slot)); |
| 1913 | |
| 1914 | rset_marked_array_elements += fa->length(); |
| 1915 | // Manually inline FixedArray::IterateBody |
| 1916 | Address elm_start = slot + FixedArray::kHeaderSize; |
| 1917 | Address elm_stop = elm_start + fa->length() * kPointerSize; |
| 1918 | for (Address elm_addr = elm_start; |
| 1919 | elm_addr < elm_stop; elm_addr += kPointerSize) { |
| 1920 | // Filter non-heap-object pointers |
| 1921 | Object** elm_p = reinterpret_cast<Object**>(elm_addr); |
| 1922 | if (Heap::InNewSpace(*elm_p)) |
| 1923 | cross_gen_array_elements++; |
| 1924 | } |
| 1925 | } else { |
| 1926 | rset_marked_pointers++; |
| 1927 | if (Heap::InNewSpace(*obj)) |
| 1928 | cross_gen_pointers++; |
| 1929 | } |
| 1930 | } |
| 1931 | } |
| 1932 | } |
| 1933 | } |
| 1934 | } |
| 1935 | |
| 1936 | pct = rset_marked_pointers == 0 ? |
| 1937 | 0 : cross_gen_pointers * 100 / rset_marked_pointers; |
| 1938 | PrintF(" rset-marked pointers %d, to-new-space %d (%%%d)\n", |
| 1939 | rset_marked_pointers, cross_gen_pointers, pct); |
| 1940 | PrintF(" rset_marked arrays %d, ", rset_marked_arrays); |
| 1941 | PrintF(" elements %d, ", rset_marked_array_elements); |
| 1942 | pct = rset_marked_array_elements == 0 ? 0 |
| 1943 | : cross_gen_array_elements * 100 / rset_marked_array_elements; |
| 1944 | PrintF(" pointers to new space %d (%%%d)\n", cross_gen_array_elements, pct); |
| 1945 | PrintF(" total rset-marked bits %d\n", |
| 1946 | (rset_marked_pointers + rset_marked_arrays)); |
| 1947 | pct = (rset_marked_pointers + rset_marked_array_elements) == 0 ? 0 |
| 1948 | : (cross_gen_pointers + cross_gen_array_elements) * 100 / |
| 1949 | (rset_marked_pointers + rset_marked_array_elements); |
| 1950 | PrintF(" total rset pointers %d, true cross generation ones %d (%%%d)\n", |
| 1951 | (rset_marked_pointers + rset_marked_array_elements), |
| 1952 | (cross_gen_pointers + cross_gen_array_elements), |
| 1953 | pct); |
| 1954 | |
| 1955 | ClearHistograms(); |
| 1956 | HeapObjectIterator obj_it(this); |
| 1957 | while (obj_it.has_next()) { CollectHistogramInfo(obj_it.next()); } |
| 1958 | ReportHistogram(true); |
| 1959 | } |
| 1960 | |
| 1961 | |
| 1962 | // Dump the range of remembered set words between [start, end) corresponding |
| 1963 | // to the pointers starting at object_p. The allocation_top is an object |
| 1964 | // pointer which should not be read past. This is important for large object |
| 1965 | // pages, where some bits in the remembered set range do not correspond to |
| 1966 | // allocated addresses. |
| 1967 | static void PrintRSetRange(Address start, Address end, Object** object_p, |
| 1968 | Address allocation_top) { |
| 1969 | Address rset_address = start; |
| 1970 | |
| 1971 | // If the range starts on on odd numbered word (eg, for large object extra |
| 1972 | // remembered set ranges), print some spaces. |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 1973 | if ((reinterpret_cast<uintptr_t>(start) / kIntSize) % 2 == 1) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1974 | PrintF(" "); |
| 1975 | } |
| 1976 | |
| 1977 | // Loop over all the words in the range. |
| 1978 | while (rset_address < end) { |
| 1979 | uint32_t rset_word = Memory::uint32_at(rset_address); |
| 1980 | int bit_position = 0; |
| 1981 | |
| 1982 | // Loop over all the bits in the word. |
| 1983 | while (bit_position < kBitsPerInt) { |
| 1984 | if (object_p == reinterpret_cast<Object**>(allocation_top)) { |
| 1985 | // Print a bar at the allocation pointer. |
| 1986 | PrintF("|"); |
| 1987 | } else if (object_p > reinterpret_cast<Object**>(allocation_top)) { |
| 1988 | // Do not dereference object_p past the allocation pointer. |
| 1989 | PrintF("#"); |
| 1990 | } else if ((rset_word & (1 << bit_position)) == 0) { |
| 1991 | // Print a dot for zero bits. |
| 1992 | PrintF("."); |
| 1993 | } else if (Heap::InNewSpace(*object_p)) { |
| 1994 | // Print an X for one bits for pointers to new space. |
| 1995 | PrintF("X"); |
| 1996 | } else { |
| 1997 | // Print a circle for one bits for pointers to old space. |
| 1998 | PrintF("o"); |
| 1999 | } |
| 2000 | |
| 2001 | // Print a space after every 8th bit except the last. |
| 2002 | if (bit_position % 8 == 7 && bit_position != (kBitsPerInt - 1)) { |
| 2003 | PrintF(" "); |
| 2004 | } |
| 2005 | |
| 2006 | // Advance to next bit. |
| 2007 | bit_position++; |
| 2008 | object_p++; |
| 2009 | } |
| 2010 | |
| 2011 | // Print a newline after every odd numbered word, otherwise a space. |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 2012 | if ((reinterpret_cast<uintptr_t>(rset_address) / kIntSize) % 2 == 1) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2013 | PrintF("\n"); |
| 2014 | } else { |
| 2015 | PrintF(" "); |
| 2016 | } |
| 2017 | |
| 2018 | // Advance to next remembered set word. |
| 2019 | rset_address += kIntSize; |
| 2020 | } |
| 2021 | } |
| 2022 | |
| 2023 | |
| 2024 | void PagedSpace::DoPrintRSet(const char* space_name) { |
| 2025 | PageIterator it(this, PageIterator::PAGES_IN_USE); |
| 2026 | while (it.has_next()) { |
| 2027 | Page* p = it.next(); |
| 2028 | PrintF("%s page 0x%x:\n", space_name, p); |
| 2029 | PrintRSetRange(p->RSetStart(), p->RSetEnd(), |
| 2030 | reinterpret_cast<Object**>(p->ObjectAreaStart()), |
| 2031 | p->AllocationTop()); |
| 2032 | PrintF("\n"); |
| 2033 | } |
| 2034 | } |
| 2035 | |
| 2036 | |
| 2037 | void OldSpace::PrintRSet() { DoPrintRSet("old"); } |
| 2038 | #endif |
| 2039 | |
| 2040 | // ----------------------------------------------------------------------------- |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2041 | // FixedSpace implementation |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2042 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2043 | void FixedSpace::PrepareForMarkCompact(bool will_compact) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2044 | if (will_compact) { |
| 2045 | // Reset relocation info. |
| 2046 | MCResetRelocationInfo(); |
| 2047 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2048 | // During a compacting collection, everything in the space is considered |
| 2049 | // 'available' (set by the call to MCResetRelocationInfo) and we will |
| 2050 | // rediscover live and wasted bytes during the collection. |
| 2051 | ASSERT(Available() == Capacity()); |
| 2052 | } else { |
| 2053 | // During a non-compacting collection, everything below the linear |
| 2054 | // allocation pointer except wasted top-of-page blocks is considered |
| 2055 | // allocated and we will rediscover available bytes during the |
| 2056 | // collection. |
| 2057 | accounting_stats_.AllocateBytes(free_list_.available()); |
| 2058 | } |
| 2059 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2060 | // Clear the free list before a full GC---it will be rebuilt afterward. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2061 | free_list_.Reset(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2062 | } |
| 2063 | |
| 2064 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2065 | void FixedSpace::MCCommitRelocationInfo() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2066 | // Update fast allocation info. |
| 2067 | allocation_info_.top = mc_forwarding_info_.top; |
| 2068 | allocation_info_.limit = mc_forwarding_info_.limit; |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2069 | ASSERT(allocation_info_.VerifyPagedAllocation()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2070 | |
| 2071 | // The space is compacted and we haven't yet wasted any space. |
| 2072 | ASSERT(Waste() == 0); |
| 2073 | |
| 2074 | // Update allocation_top of each page in use and compute waste. |
| 2075 | int computed_size = 0; |
| 2076 | PageIterator it(this, PageIterator::PAGES_USED_BY_MC); |
| 2077 | while (it.has_next()) { |
| 2078 | Page* page = it.next(); |
| 2079 | Address page_top = page->AllocationTop(); |
| 2080 | computed_size += page_top - page->ObjectAreaStart(); |
| 2081 | if (it.has_next()) { |
| 2082 | accounting_stats_.WasteBytes(page->ObjectAreaEnd() - page_top); |
| 2083 | } |
| 2084 | } |
| 2085 | |
| 2086 | // Make sure the computed size - based on the used portion of the |
| 2087 | // pages in use - matches the size we adjust during allocation. |
| 2088 | ASSERT(computed_size == Size()); |
| 2089 | } |
| 2090 | |
| 2091 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2092 | // Slow case for normal allocation. Try in order: (1) allocate in the next |
| 2093 | // page in the space, (2) allocate off the space's free list, (3) expand the |
| 2094 | // space, (4) fail. |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2095 | HeapObject* FixedSpace::SlowAllocateRaw(int size_in_bytes) { |
| 2096 | ASSERT_EQ(object_size_in_bytes_, size_in_bytes); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2097 | // Linear allocation in this space has failed. If there is another page |
| 2098 | // in the space, move to that page and allocate there. This allocation |
| 2099 | // should succeed. |
| 2100 | Page* current_page = TopPageOf(allocation_info_); |
| 2101 | if (current_page->next_page()->is_valid()) { |
| 2102 | return AllocateInNextPage(current_page, size_in_bytes); |
| 2103 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2104 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2105 | // There is no next page in this space. Try free list allocation. |
| 2106 | // The fixed space free list implicitly assumes that all free blocks |
| 2107 | // are of the fixed size. |
| 2108 | if (size_in_bytes == object_size_in_bytes_) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2109 | Object* result = free_list_.Allocate(); |
| 2110 | if (!result->IsFailure()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2111 | accounting_stats_.AllocateBytes(size_in_bytes); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2112 | return HeapObject::cast(result); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2113 | } |
| 2114 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2115 | |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2116 | // Free list allocation failed and there is no next page. Fail if we have |
| 2117 | // hit the old generation size limit that should cause a garbage |
| 2118 | // collection. |
| 2119 | if (!Heap::always_allocate() && Heap::OldGenerationAllocationLimitReached()) { |
| 2120 | return NULL; |
| 2121 | } |
| 2122 | |
| 2123 | // Try to expand the space and allocate in the new next page. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2124 | ASSERT(!current_page->next_page()->is_valid()); |
| 2125 | if (Expand(current_page)) { |
| 2126 | return AllocateInNextPage(current_page, size_in_bytes); |
| 2127 | } |
| 2128 | |
| 2129 | // Finally, fail. |
| 2130 | return NULL; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2131 | } |
| 2132 | |
| 2133 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2134 | // Move to the next page (there is assumed to be one) and allocate there. |
| 2135 | // The top of page block is always wasted, because it is too small to hold a |
| 2136 | // map. |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2137 | HeapObject* FixedSpace::AllocateInNextPage(Page* current_page, |
| 2138 | int size_in_bytes) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2139 | ASSERT(current_page->next_page()->is_valid()); |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2140 | ASSERT(current_page->ObjectAreaEnd() - allocation_info_.top == page_extra_); |
| 2141 | ASSERT_EQ(object_size_in_bytes_, size_in_bytes); |
| 2142 | accounting_stats_.WasteBytes(page_extra_); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2143 | SetAllocationInfo(&allocation_info_, current_page->next_page()); |
| 2144 | return AllocateLinearly(&allocation_info_, size_in_bytes); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2145 | } |
| 2146 | |
| 2147 | |
| 2148 | #ifdef DEBUG |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2149 | void FixedSpace::ReportStatistics() { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2150 | int pct = Available() * 100 / Capacity(); |
| 2151 | PrintF(" capacity: %d, waste: %d, available: %d, %%%d\n", |
| 2152 | Capacity(), Waste(), Available(), pct); |
| 2153 | |
| 2154 | // Report remembered set statistics. |
| 2155 | int rset_marked_pointers = 0; |
| 2156 | int cross_gen_pointers = 0; |
| 2157 | |
| 2158 | PageIterator page_it(this, PageIterator::PAGES_IN_USE); |
| 2159 | while (page_it.has_next()) { |
| 2160 | Page* p = page_it.next(); |
| 2161 | |
| 2162 | for (Address rset_addr = p->RSetStart(); |
| 2163 | rset_addr < p->RSetEnd(); |
| 2164 | rset_addr += kIntSize) { |
| 2165 | int rset = Memory::int_at(rset_addr); |
| 2166 | if (rset != 0) { |
| 2167 | // Bits were set |
christian.plesner.hansen@gmail.com | 2bc58ef | 2009-09-22 10:00:30 +0000 | [diff] [blame^] | 2168 | int intoff = rset_addr - p->address() - Page::kRSetOffset; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2169 | int bitoff = 0; |
| 2170 | for (; bitoff < kBitsPerInt; ++bitoff) { |
| 2171 | if ((rset & (1 << bitoff)) != 0) { |
| 2172 | int bitpos = intoff*kBitsPerByte + bitoff; |
| 2173 | Address slot = p->OffsetToAddress(bitpos << kObjectAlignmentBits); |
| 2174 | Object** obj = reinterpret_cast<Object**>(slot); |
| 2175 | rset_marked_pointers++; |
| 2176 | if (Heap::InNewSpace(*obj)) |
| 2177 | cross_gen_pointers++; |
| 2178 | } |
| 2179 | } |
| 2180 | } |
| 2181 | } |
| 2182 | } |
| 2183 | |
| 2184 | pct = rset_marked_pointers == 0 ? |
| 2185 | 0 : cross_gen_pointers * 100 / rset_marked_pointers; |
| 2186 | PrintF(" rset-marked pointers %d, to-new-space %d (%%%d)\n", |
| 2187 | rset_marked_pointers, cross_gen_pointers, pct); |
| 2188 | |
| 2189 | ClearHistograms(); |
| 2190 | HeapObjectIterator obj_it(this); |
| 2191 | while (obj_it.has_next()) { CollectHistogramInfo(obj_it.next()); } |
| 2192 | ReportHistogram(false); |
| 2193 | } |
| 2194 | |
| 2195 | |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 2196 | void FixedSpace::PrintRSet() { DoPrintRSet(name_); } |
| 2197 | #endif |
| 2198 | |
| 2199 | |
| 2200 | // ----------------------------------------------------------------------------- |
| 2201 | // MapSpace implementation |
| 2202 | |
| 2203 | void MapSpace::PrepareForMarkCompact(bool will_compact) { |
| 2204 | // Call prepare of the super class. |
| 2205 | FixedSpace::PrepareForMarkCompact(will_compact); |
| 2206 | |
| 2207 | if (will_compact) { |
| 2208 | // Initialize map index entry. |
| 2209 | int page_count = 0; |
| 2210 | PageIterator it(this, PageIterator::ALL_PAGES); |
| 2211 | while (it.has_next()) { |
| 2212 | ASSERT_MAP_PAGE_INDEX(page_count); |
| 2213 | |
| 2214 | Page* p = it.next(); |
| 2215 | ASSERT(p->mc_page_index == page_count); |
| 2216 | |
| 2217 | page_addresses_[page_count++] = p->address(); |
| 2218 | } |
| 2219 | } |
| 2220 | } |
| 2221 | |
| 2222 | |
| 2223 | #ifdef DEBUG |
| 2224 | void MapSpace::VerifyObject(HeapObject* object) { |
| 2225 | // The object should be a map or a free-list node. |
| 2226 | ASSERT(object->IsMap() || object->IsByteArray()); |
| 2227 | } |
| 2228 | #endif |
| 2229 | |
| 2230 | |
| 2231 | // ----------------------------------------------------------------------------- |
| 2232 | // GlobalPropertyCellSpace implementation |
| 2233 | |
| 2234 | #ifdef DEBUG |
| 2235 | void CellSpace::VerifyObject(HeapObject* object) { |
| 2236 | // The object should be a global object property cell or a free-list node. |
| 2237 | ASSERT(object->IsJSGlobalPropertyCell() || |
| 2238 | object->map() == Heap::two_pointer_filler_map()); |
| 2239 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2240 | #endif |
| 2241 | |
| 2242 | |
| 2243 | // ----------------------------------------------------------------------------- |
| 2244 | // LargeObjectIterator |
| 2245 | |
| 2246 | LargeObjectIterator::LargeObjectIterator(LargeObjectSpace* space) { |
| 2247 | current_ = space->first_chunk_; |
| 2248 | size_func_ = NULL; |
| 2249 | } |
| 2250 | |
| 2251 | |
| 2252 | LargeObjectIterator::LargeObjectIterator(LargeObjectSpace* space, |
| 2253 | HeapObjectCallback size_func) { |
| 2254 | current_ = space->first_chunk_; |
| 2255 | size_func_ = size_func; |
| 2256 | } |
| 2257 | |
| 2258 | |
| 2259 | HeapObject* LargeObjectIterator::next() { |
| 2260 | ASSERT(has_next()); |
| 2261 | HeapObject* object = current_->GetObject(); |
| 2262 | current_ = current_->next(); |
| 2263 | return object; |
| 2264 | } |
| 2265 | |
| 2266 | |
| 2267 | // ----------------------------------------------------------------------------- |
| 2268 | // LargeObjectChunk |
| 2269 | |
| 2270 | LargeObjectChunk* LargeObjectChunk::New(int size_in_bytes, |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2271 | size_t* chunk_size, |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2272 | Executability executable) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2273 | size_t requested = ChunkSizeFor(size_in_bytes); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2274 | void* mem = MemoryAllocator::AllocateRawMemory(requested, |
| 2275 | chunk_size, |
| 2276 | executable); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2277 | if (mem == NULL) return NULL; |
| 2278 | LOG(NewEvent("LargeObjectChunk", mem, *chunk_size)); |
| 2279 | if (*chunk_size < requested) { |
| 2280 | MemoryAllocator::FreeRawMemory(mem, *chunk_size); |
| 2281 | LOG(DeleteEvent("LargeObjectChunk", mem)); |
| 2282 | return NULL; |
| 2283 | } |
| 2284 | return reinterpret_cast<LargeObjectChunk*>(mem); |
| 2285 | } |
| 2286 | |
| 2287 | |
| 2288 | int LargeObjectChunk::ChunkSizeFor(int size_in_bytes) { |
| 2289 | int os_alignment = OS::AllocateAlignment(); |
| 2290 | if (os_alignment < Page::kPageSize) |
| 2291 | size_in_bytes += (Page::kPageSize - os_alignment); |
| 2292 | return size_in_bytes + Page::kObjectStartOffset; |
| 2293 | } |
| 2294 | |
| 2295 | // ----------------------------------------------------------------------------- |
| 2296 | // LargeObjectSpace |
| 2297 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2298 | LargeObjectSpace::LargeObjectSpace(AllocationSpace id) |
| 2299 | : Space(id, NOT_EXECUTABLE), // Managed on a per-allocation basis |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2300 | first_chunk_(NULL), |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2301 | size_(0), |
| 2302 | page_count_(0) {} |
| 2303 | |
| 2304 | |
| 2305 | bool LargeObjectSpace::Setup() { |
| 2306 | first_chunk_ = NULL; |
| 2307 | size_ = 0; |
| 2308 | page_count_ = 0; |
| 2309 | return true; |
| 2310 | } |
| 2311 | |
| 2312 | |
| 2313 | void LargeObjectSpace::TearDown() { |
| 2314 | while (first_chunk_ != NULL) { |
| 2315 | LargeObjectChunk* chunk = first_chunk_; |
| 2316 | first_chunk_ = first_chunk_->next(); |
| 2317 | LOG(DeleteEvent("LargeObjectChunk", chunk->address())); |
| 2318 | MemoryAllocator::FreeRawMemory(chunk->address(), chunk->size()); |
| 2319 | } |
| 2320 | |
| 2321 | size_ = 0; |
| 2322 | page_count_ = 0; |
| 2323 | } |
| 2324 | |
| 2325 | |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 2326 | #ifdef ENABLE_HEAP_PROTECTION |
| 2327 | |
| 2328 | void LargeObjectSpace::Protect() { |
| 2329 | LargeObjectChunk* chunk = first_chunk_; |
| 2330 | while (chunk != NULL) { |
| 2331 | MemoryAllocator::Protect(chunk->address(), chunk->size()); |
| 2332 | chunk = chunk->next(); |
| 2333 | } |
| 2334 | } |
| 2335 | |
| 2336 | |
| 2337 | void LargeObjectSpace::Unprotect() { |
| 2338 | LargeObjectChunk* chunk = first_chunk_; |
| 2339 | while (chunk != NULL) { |
| 2340 | bool is_code = chunk->GetObject()->IsCode(); |
| 2341 | MemoryAllocator::Unprotect(chunk->address(), chunk->size(), |
| 2342 | is_code ? EXECUTABLE : NOT_EXECUTABLE); |
| 2343 | chunk = chunk->next(); |
| 2344 | } |
| 2345 | } |
| 2346 | |
| 2347 | #endif |
| 2348 | |
| 2349 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2350 | Object* LargeObjectSpace::AllocateRawInternal(int requested_size, |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2351 | int object_size, |
| 2352 | Executability executable) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2353 | ASSERT(0 < object_size && object_size <= requested_size); |
kasperl@chromium.org | 9bbf968 | 2008-10-30 11:53:07 +0000 | [diff] [blame] | 2354 | |
| 2355 | // Check if we want to force a GC before growing the old space further. |
| 2356 | // If so, fail the allocation. |
| 2357 | if (!Heap::always_allocate() && Heap::OldGenerationAllocationLimitReached()) { |
| 2358 | return Failure::RetryAfterGC(requested_size, identity()); |
| 2359 | } |
| 2360 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2361 | size_t chunk_size; |
| 2362 | LargeObjectChunk* chunk = |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2363 | LargeObjectChunk::New(requested_size, &chunk_size, executable); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2364 | if (chunk == NULL) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2365 | return Failure::RetryAfterGC(requested_size, identity()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2366 | } |
| 2367 | |
| 2368 | size_ += chunk_size; |
| 2369 | page_count_++; |
| 2370 | chunk->set_next(first_chunk_); |
| 2371 | chunk->set_size(chunk_size); |
| 2372 | first_chunk_ = chunk; |
| 2373 | |
| 2374 | // Set the object address and size in the page header and clear its |
| 2375 | // remembered set. |
| 2376 | Page* page = Page::FromAddress(RoundUp(chunk->address(), Page::kPageSize)); |
| 2377 | Address object_address = page->ObjectAreaStart(); |
| 2378 | // Clear the low order bit of the second word in the page to flag it as a |
| 2379 | // large object page. If the chunk_size happened to be written there, its |
| 2380 | // low order bit should already be clear. |
| 2381 | ASSERT((chunk_size & 0x1) == 0); |
| 2382 | page->is_normal_page &= ~0x1; |
| 2383 | page->ClearRSet(); |
| 2384 | int extra_bytes = requested_size - object_size; |
| 2385 | if (extra_bytes > 0) { |
| 2386 | // The extra memory for the remembered set should be cleared. |
| 2387 | memset(object_address + object_size, 0, extra_bytes); |
| 2388 | } |
| 2389 | |
| 2390 | return HeapObject::FromAddress(object_address); |
| 2391 | } |
| 2392 | |
| 2393 | |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2394 | Object* LargeObjectSpace::AllocateRawCode(int size_in_bytes) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2395 | ASSERT(0 < size_in_bytes); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2396 | return AllocateRawInternal(size_in_bytes, |
| 2397 | size_in_bytes, |
| 2398 | EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2399 | } |
| 2400 | |
| 2401 | |
| 2402 | Object* LargeObjectSpace::AllocateRawFixedArray(int size_in_bytes) { |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2403 | ASSERT(0 < size_in_bytes); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2404 | int extra_rset_bytes = ExtraRSetBytesFor(size_in_bytes); |
ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 2405 | return AllocateRawInternal(size_in_bytes + extra_rset_bytes, |
| 2406 | size_in_bytes, |
| 2407 | NOT_EXECUTABLE); |
| 2408 | } |
| 2409 | |
| 2410 | |
| 2411 | Object* LargeObjectSpace::AllocateRaw(int size_in_bytes) { |
| 2412 | ASSERT(0 < size_in_bytes); |
| 2413 | return AllocateRawInternal(size_in_bytes, |
| 2414 | size_in_bytes, |
| 2415 | NOT_EXECUTABLE); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2416 | } |
| 2417 | |
| 2418 | |
| 2419 | // GC support |
| 2420 | Object* LargeObjectSpace::FindObject(Address a) { |
| 2421 | for (LargeObjectChunk* chunk = first_chunk_; |
| 2422 | chunk != NULL; |
| 2423 | chunk = chunk->next()) { |
| 2424 | Address chunk_address = chunk->address(); |
| 2425 | if (chunk_address <= a && a < chunk_address + chunk->size()) { |
| 2426 | return chunk->GetObject(); |
| 2427 | } |
| 2428 | } |
| 2429 | return Failure::Exception(); |
| 2430 | } |
| 2431 | |
| 2432 | |
| 2433 | void LargeObjectSpace::ClearRSet() { |
| 2434 | ASSERT(Page::is_rset_in_use()); |
| 2435 | |
| 2436 | LargeObjectIterator it(this); |
| 2437 | while (it.has_next()) { |
| 2438 | HeapObject* object = it.next(); |
| 2439 | // We only have code, sequential strings, or fixed arrays in large |
| 2440 | // object space, and only fixed arrays need remembered set support. |
| 2441 | if (object->IsFixedArray()) { |
| 2442 | // Clear the normal remembered set region of the page; |
| 2443 | Page* page = Page::FromAddress(object->address()); |
| 2444 | page->ClearRSet(); |
| 2445 | |
| 2446 | // Clear the extra remembered set. |
| 2447 | int size = object->Size(); |
| 2448 | int extra_rset_bytes = ExtraRSetBytesFor(size); |
| 2449 | memset(object->address() + size, 0, extra_rset_bytes); |
| 2450 | } |
| 2451 | } |
| 2452 | } |
| 2453 | |
| 2454 | |
| 2455 | void LargeObjectSpace::IterateRSet(ObjectSlotCallback copy_object_func) { |
| 2456 | ASSERT(Page::is_rset_in_use()); |
| 2457 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 2458 | static void* lo_rset_histogram = StatsTable::CreateHistogram( |
| 2459 | "V8.RSetLO", |
| 2460 | 0, |
| 2461 | // Keeping this histogram's buckets the same as the paged space histogram. |
| 2462 | Page::kObjectAreaSize / kPointerSize, |
| 2463 | 30); |
| 2464 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2465 | LargeObjectIterator it(this); |
| 2466 | while (it.has_next()) { |
| 2467 | // We only have code, sequential strings, or fixed arrays in large |
| 2468 | // object space, and only fixed arrays can possibly contain pointers to |
| 2469 | // the young generation. |
| 2470 | HeapObject* object = it.next(); |
| 2471 | if (object->IsFixedArray()) { |
| 2472 | // Iterate the normal page remembered set range. |
| 2473 | Page* page = Page::FromAddress(object->address()); |
| 2474 | Address object_end = object->address() + object->Size(); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 2475 | int count = Heap::IterateRSetRange(page->ObjectAreaStart(), |
| 2476 | Min(page->ObjectAreaEnd(), object_end), |
| 2477 | page->RSetStart(), |
| 2478 | copy_object_func); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2479 | |
| 2480 | // Iterate the extra array elements. |
| 2481 | if (object_end > page->ObjectAreaEnd()) { |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 2482 | count += Heap::IterateRSetRange(page->ObjectAreaEnd(), object_end, |
| 2483 | object_end, copy_object_func); |
| 2484 | } |
| 2485 | if (lo_rset_histogram != NULL) { |
| 2486 | StatsTable::AddHistogramSample(lo_rset_histogram, count); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2487 | } |
| 2488 | } |
| 2489 | } |
| 2490 | } |
| 2491 | |
| 2492 | |
| 2493 | void LargeObjectSpace::FreeUnmarkedObjects() { |
| 2494 | LargeObjectChunk* previous = NULL; |
| 2495 | LargeObjectChunk* current = first_chunk_; |
| 2496 | while (current != NULL) { |
| 2497 | HeapObject* object = current->GetObject(); |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 2498 | if (object->IsMarked()) { |
| 2499 | object->ClearMark(); |
| 2500 | MarkCompactCollector::tracer()->decrement_marked_count(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2501 | previous = current; |
| 2502 | current = current->next(); |
| 2503 | } else { |
| 2504 | Address chunk_address = current->address(); |
| 2505 | size_t chunk_size = current->size(); |
| 2506 | |
| 2507 | // Cut the chunk out from the chunk list. |
| 2508 | current = current->next(); |
| 2509 | if (previous == NULL) { |
| 2510 | first_chunk_ = current; |
| 2511 | } else { |
| 2512 | previous->set_next(current); |
| 2513 | } |
| 2514 | |
| 2515 | // Free the chunk. |
| 2516 | if (object->IsCode()) { |
| 2517 | LOG(CodeDeleteEvent(object->address())); |
| 2518 | } |
| 2519 | size_ -= chunk_size; |
| 2520 | page_count_--; |
| 2521 | MemoryAllocator::FreeRawMemory(chunk_address, chunk_size); |
| 2522 | LOG(DeleteEvent("LargeObjectChunk", chunk_address)); |
| 2523 | } |
| 2524 | } |
| 2525 | } |
| 2526 | |
| 2527 | |
| 2528 | bool LargeObjectSpace::Contains(HeapObject* object) { |
| 2529 | Address address = object->address(); |
| 2530 | Page* page = Page::FromAddress(address); |
| 2531 | |
| 2532 | SLOW_ASSERT(!page->IsLargeObjectPage() |
| 2533 | || !FindObject(address)->IsFailure()); |
| 2534 | |
| 2535 | return page->IsLargeObjectPage(); |
| 2536 | } |
| 2537 | |
| 2538 | |
| 2539 | #ifdef DEBUG |
| 2540 | // We do not assume that the large object iterator works, because it depends |
| 2541 | // on the invariants we are checking during verification. |
| 2542 | void LargeObjectSpace::Verify() { |
| 2543 | for (LargeObjectChunk* chunk = first_chunk_; |
| 2544 | chunk != NULL; |
| 2545 | chunk = chunk->next()) { |
| 2546 | // Each chunk contains an object that starts at the large object page's |
| 2547 | // object area start. |
| 2548 | HeapObject* object = chunk->GetObject(); |
| 2549 | Page* page = Page::FromAddress(object->address()); |
| 2550 | ASSERT(object->address() == page->ObjectAreaStart()); |
| 2551 | |
| 2552 | // The first word should be a map, and we expect all map pointers to be |
| 2553 | // in map space. |
| 2554 | Map* map = object->map(); |
| 2555 | ASSERT(map->IsMap()); |
| 2556 | ASSERT(Heap::map_space()->Contains(map)); |
| 2557 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 2558 | // We have only code, sequential strings, external strings |
| 2559 | // (sequential strings that have been morphed into external |
| 2560 | // strings), fixed arrays, and byte arrays in large object space. |
| 2561 | ASSERT(object->IsCode() || object->IsSeqString() || |
| 2562 | object->IsExternalString() || object->IsFixedArray() || |
| 2563 | object->IsByteArray()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2564 | |
| 2565 | // The object itself should look OK. |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 2566 | object->Verify(); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2567 | |
| 2568 | // Byte arrays and strings don't have interior pointers. |
| 2569 | if (object->IsCode()) { |
| 2570 | VerifyPointersVisitor code_visitor; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2571 | object->IterateBody(map->instance_type(), |
| 2572 | object->Size(), |
| 2573 | &code_visitor); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 2574 | } else if (object->IsFixedArray()) { |
| 2575 | // We loop over fixed arrays ourselves, rather then using the visitor, |
| 2576 | // because the visitor doesn't support the start/offset iteration |
| 2577 | // needed for IsRSetSet. |
| 2578 | FixedArray* array = FixedArray::cast(object); |
| 2579 | for (int j = 0; j < array->length(); j++) { |
| 2580 | Object* element = array->get(j); |
| 2581 | if (element->IsHeapObject()) { |
| 2582 | HeapObject* element_object = HeapObject::cast(element); |
| 2583 | ASSERT(Heap::Contains(element_object)); |
| 2584 | ASSERT(element_object->map()->IsMap()); |
| 2585 | if (Heap::InNewSpace(element_object)) { |
| 2586 | ASSERT(Page::IsRSetSet(object->address(), |
| 2587 | FixedArray::kHeaderSize + j * kPointerSize)); |
| 2588 | } |
| 2589 | } |
| 2590 | } |
| 2591 | } |
| 2592 | } |
| 2593 | } |
| 2594 | |
| 2595 | |
| 2596 | void LargeObjectSpace::Print() { |
| 2597 | LargeObjectIterator it(this); |
| 2598 | while (it.has_next()) { |
| 2599 | it.next()->Print(); |
| 2600 | } |
| 2601 | } |
| 2602 | |
| 2603 | |
| 2604 | void LargeObjectSpace::ReportStatistics() { |
| 2605 | PrintF(" size: %d\n", size_); |
| 2606 | int num_objects = 0; |
| 2607 | ClearHistograms(); |
| 2608 | LargeObjectIterator it(this); |
| 2609 | while (it.has_next()) { |
| 2610 | num_objects++; |
| 2611 | CollectHistogramInfo(it.next()); |
| 2612 | } |
| 2613 | |
| 2614 | PrintF(" number of objects %d\n", num_objects); |
| 2615 | if (num_objects > 0) ReportHistogram(false); |
| 2616 | } |
| 2617 | |
| 2618 | |
| 2619 | void LargeObjectSpace::CollectCodeStatistics() { |
| 2620 | LargeObjectIterator obj_it(this); |
| 2621 | while (obj_it.has_next()) { |
| 2622 | HeapObject* obj = obj_it.next(); |
| 2623 | if (obj->IsCode()) { |
| 2624 | Code* code = Code::cast(obj); |
| 2625 | code_kind_statistics[code->kind()] += code->Size(); |
| 2626 | } |
| 2627 | } |
| 2628 | } |
| 2629 | |
| 2630 | |
| 2631 | void LargeObjectSpace::PrintRSet() { |
| 2632 | LargeObjectIterator it(this); |
| 2633 | while (it.has_next()) { |
| 2634 | HeapObject* object = it.next(); |
| 2635 | if (object->IsFixedArray()) { |
| 2636 | Page* page = Page::FromAddress(object->address()); |
| 2637 | |
| 2638 | Address allocation_top = object->address() + object->Size(); |
| 2639 | PrintF("large page 0x%x:\n", page); |
| 2640 | PrintRSetRange(page->RSetStart(), page->RSetEnd(), |
| 2641 | reinterpret_cast<Object**>(object->address()), |
| 2642 | allocation_top); |
| 2643 | int extra_array_bytes = object->Size() - Page::kObjectAreaSize; |
| 2644 | int extra_rset_bits = RoundUp(extra_array_bytes / kPointerSize, |
| 2645 | kBitsPerInt); |
| 2646 | PrintF("------------------------------------------------------------" |
| 2647 | "-----------\n"); |
| 2648 | PrintRSetRange(allocation_top, |
| 2649 | allocation_top + extra_rset_bits / kBitsPerByte, |
| 2650 | reinterpret_cast<Object**>(object->address() |
| 2651 | + Page::kObjectAreaSize), |
| 2652 | allocation_top); |
| 2653 | PrintF("\n"); |
| 2654 | } |
| 2655 | } |
| 2656 | } |
| 2657 | #endif // DEBUG |
| 2658 | |
| 2659 | } } // namespace v8::internal |