diff options
Diffstat (limited to 'js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h')
-rw-r--r-- | js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h | 35 |
1 files changed, 3 insertions, 32 deletions
diff --git a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h index fe678fc7d..8343579c8 100644 --- a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h +++ b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h @@ -68,33 +68,6 @@ namespace js { namespace jit { - // AllocPolicy for AssemblerBuffer. OOMs when trying to allocate more than - // MaxCodeBytesPerProcess bytes. Use private inheritance to make sure we - // explicitly have to expose SystemAllocPolicy methods. - class AssemblerBufferAllocPolicy : private SystemAllocPolicy - { - public: - using SystemAllocPolicy::checkSimulatedOOM; - using SystemAllocPolicy::reportAllocOverflow; - using SystemAllocPolicy::free_; - - template <typename T> T* pod_realloc(T* p, size_t oldSize, size_t newSize) { - static_assert(sizeof(T) == 1, - "AssemblerBufferAllocPolicy should only be used with byte vectors"); - MOZ_ASSERT(oldSize <= MaxCodeBytesPerProcess); - if (MOZ_UNLIKELY(newSize > MaxCodeBytesPerProcess)) - return nullptr; - return SystemAllocPolicy::pod_realloc<T>(p, oldSize, newSize); - } - template <typename T> T* pod_malloc(size_t numElems) { - static_assert(sizeof(T) == 1, - "AssemblerBufferAllocPolicy should only be used with byte vectors"); - if (MOZ_UNLIKELY(numElems > MaxCodeBytesPerProcess)) - return nullptr; - return SystemAllocPolicy::pod_malloc<T>(numElems); - } - }; - class AssemblerBuffer { template<size_t size, typename T> @@ -120,10 +93,8 @@ namespace jit { void ensureSpace(size_t space) { - // This should only be called with small |space| values to ensure - // we don't overflow below. - MOZ_ASSERT(space <= 16); - if (MOZ_UNLIKELY(!m_buffer.reserve(m_buffer.length() + space))) + if (MOZ_UNLIKELY(m_buffer.length() > (SIZE_MAX - space) || + !m_buffer.reserve(m_buffer.length() + space))) oomDetected(); } @@ -198,7 +169,7 @@ namespace jit { m_buffer.clear(); } - PageProtectingVector<unsigned char, 256, AssemblerBufferAllocPolicy> m_buffer; + PageProtectingVector<unsigned char, 256, SystemAllocPolicy> m_buffer; bool m_oom; }; |