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27 #include "ConservativeRoots.h"
29 #include "CopiedSpace.h"
30 #include "CopiedSpaceInlineMethods.h"
31 #include "CodeBlock.h"
32 #include "DFGCodeBlocks.h"
35 #include "Structure.h"
39 ConservativeRoots::ConservativeRoots(const MarkedBlockSet* blocks, CopiedSpace* copiedSpace)
40 : m_roots(m_inlineRoots)
42 , m_capacity(inlineCapacity)
44 , m_copiedSpace(copiedSpace)
48 ConservativeRoots::~ConservativeRoots()
50 if (m_roots != m_inlineRoots)
51 OSAllocator::decommitAndRelease(m_roots, m_capacity * sizeof(JSCell*));
54 void ConservativeRoots::grow()
56 size_t newCapacity = m_capacity == inlineCapacity ? nonInlineCapacity : m_capacity * 2;
57 JSCell** newRoots = static_cast<JSCell**>(OSAllocator::reserveAndCommit(newCapacity * sizeof(JSCell*)));
58 memcpy(newRoots, m_roots, m_size * sizeof(JSCell*));
59 if (m_roots != m_inlineRoots)
60 OSAllocator::decommitAndRelease(m_roots, m_capacity * sizeof(JSCell*));
61 m_capacity = newCapacity;
65 template<typename MarkHook>
66 inline void ConservativeRoots::genericAddPointer(void* p, TinyBloomFilter filter, MarkHook& markHook)
70 m_copiedSpace->pinIfNecessary(p);
72 MarkedBlock* candidate = MarkedBlock::blockFor(p);
73 if (filter.ruleOut(reinterpret_cast<Bits>(candidate))) {
74 ASSERT(!candidate || !m_blocks->set().contains(candidate));
78 if (!MarkedBlock::isAtomAligned(p))
81 if (!m_blocks->set().contains(candidate))
84 if (!candidate->isLiveCell(p))
87 if (m_size == m_capacity)
90 m_roots[m_size++] = static_cast<JSCell*>(p);
93 template<typename MarkHook>
94 void ConservativeRoots::genericAddSpan(void* begin, void* end, MarkHook& markHook)
97 ASSERT((static_cast<char*>(end) - static_cast<char*>(begin)) < 0x1000000);
98 ASSERT(isPointerAligned(begin));
99 ASSERT(isPointerAligned(end));
101 TinyBloomFilter filter = m_blocks->filter(); // Make a local copy of filter to show the compiler it won't alias, and can be register-allocated.
102 for (char** it = static_cast<char**>(begin); it != static_cast<char**>(end); ++it)
103 genericAddPointer(*it, filter, markHook);
106 class DummyMarkHook {
111 void ConservativeRoots::add(void* begin, void* end)
114 genericAddSpan(begin, end, dummy);
117 void ConservativeRoots::add(void* begin, void* end, JITStubRoutineSet& jitStubRoutines)
119 genericAddSpan(begin, end, jitStubRoutines);
122 template<typename T, typename U>
123 class CompositeMarkHook {
125 CompositeMarkHook(T& first, U& second)
131 void mark(void* address)
133 m_first.mark(address);
134 m_second.mark(address);
142 void ConservativeRoots::add(
143 void* begin, void* end, JITStubRoutineSet& jitStubRoutines, DFGCodeBlocks& dfgCodeBlocks)
145 CompositeMarkHook<JITStubRoutineSet, DFGCodeBlocks> markHook(
146 jitStubRoutines, dfgCodeBlocks);
147 genericAddSpan(begin, end, markHook);