js/src/gc/StoreBuffer-inl.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef gc_StoreBuffer_inl_h
   8 #define gc_StoreBuffer_inl_h
   9
  10 #include "gc/StoreBuffer.h"
  11
  12 #include "gc/Cell.h"
  13 #include "gc/Heap.h"
  14
  15 #include "gc/Heap-inl.h"
  16
  17 namespace js {
  18 namespace gc {
  19
  20 inline /* static */ size_t ArenaCellSet::getCellIndex(const TenuredCell* cell) {
  21   uintptr_t cellOffset = uintptr_t(cell) & ArenaMask;
  22   MOZ_ASSERT(cellOffset % ArenaCellIndexBytes == 0);
  23   return cellOffset / ArenaCellIndexBytes;
  24 }
  25
  26 inline /* static */ void ArenaCellSet::getWordIndexAndMask(size_t cellIndex,
  27                                                            size_t* wordp,
  28                                                            uint32_t* maskp) {
  29   BitArray<MaxArenaCellIndex>::getIndexAndMask(cellIndex, wordp, maskp);
  30 }
  31
  32 inline bool ArenaCellSet::hasCell(size_t cellIndex) const {
  33   MOZ_ASSERT(cellIndex < MaxArenaCellIndex);
  34   return bits.get(cellIndex);
  35 }
  36
  37 inline void ArenaCellSet::putCell(size_t cellIndex) {
  38   MOZ_ASSERT(cellIndex < MaxArenaCellIndex);
  39   MOZ_ASSERT(arena);
  40
  41   bits.set(cellIndex);
  42   check();
  43 }
  44
  45 inline void ArenaCellSet::check() const {
  46 #ifdef DEBUG
  47   bool bitsZero = bits.isAllClear();
  48   MOZ_ASSERT(isEmpty() == bitsZero);
  49   MOZ_ASSERT(isEmpty() == !arena);
  50   if (!isEmpty()) {
  51     MOZ_ASSERT(IsCellPointerValid(arena));
  52     JSRuntime* runtime = arena->zone->runtimeFromMainThread();
  53     uint64_t minorGCCount = runtime->gc.minorGCCount();
  54     MOZ_ASSERT(minorGCCount == minorGCNumberAtCreation ||
  55                minorGCCount == minorGCNumberAtCreation + 1);
  56   }
  57 #endif
  58 }
  59
  60 inline void StoreBuffer::WholeCellBuffer::put(const Cell* cell) {
  61   if (cell != last_) {
  62     putDontCheckLast(cell);
  63   }
  64 }
  65
  66 inline void StoreBuffer::WholeCellBuffer::putDontCheckLast(const Cell* cell) {
  67   // This can still be called when |cell == last_| if the caller didn't check
  68   // and that's OK.
  69
  70   MOZ_ASSERT(cell->isTenured());
  71
  72   // BigInts don't have any children, so shouldn't show up here.
  73   MOZ_ASSERT(cell->getTraceKind() != JS::TraceKind::BigInt);
  74
  75   Arena* arena = cell->asTenured().arena();
  76   ArenaCellSet* cells = arena->bufferedCells();
  77   if (cells->isEmpty()) {
  78     cells = allocateCellSet(arena);
  79     if (!cells) {
  80       return;
  81     }
  82   }
  83
  84   cells->putCell(&cell->asTenured());
  85   cells->check();
  86
  87   last_ = cell;
  88 }
  89
  90 inline void StoreBuffer::putWholeCell(Cell* cell) { bufferWholeCell.put(cell); }
  91 inline void StoreBuffer::putWholeCellDontCheckLast(Cell* cell) {
  92   bufferWholeCell.putDontCheckLast(cell);
  93 }
  94
  95 }  // namespace gc
  96 }  // namespace js
  97
  98 #endif  // gc_StoreBuffer_inl_h