Exemplo n.º 1
0
void
SharedArrayRawBuffer::dropReference()
{
    // Drop the reference to the buffer.
    uint32_t refcount = --this->refcount; // Atomic.

    // If this was the final reference, release the buffer.
    if (refcount == 0) {
        SharedMem<uint8_t*> p = this->dataPointerShared() - AsmJSPageSize;

        MOZ_ASSERT(p.asValue() % AsmJSPageSize == 0);

        uint8_t* address = p.unwrap(/*safe - only reference*/);
#if defined(ASMJS_MAY_USE_SIGNAL_HANDLERS_FOR_OOB)
        numLive--;
        UnmapMemory(address, SharedArrayMappedSize);
#       if defined(MOZ_VALGRIND) \
           && defined(VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE)
        // Tell Valgrind/Memcheck to recommence reporting accesses in the
        // previously-inaccessible region.
        VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE(address,
                                                      SharedArrayMappedSize);
#       endif
#else
        UnmapMemory(address, this->length + AsmJSPageSize);
#endif
    }
}
Exemplo n.º 2
0
void
SharedArrayRawBuffer::dropReference()
{
    // Drop the reference to the buffer.
    uint32_t refcount = --this->refcount_; // Atomic.
    if (refcount)
        return;

    // If this was the final reference, release the buffer.

    SharedMem<uint8_t*> p = this->dataPointerShared() - gc::SystemPageSize();
    MOZ_ASSERT(p.asValue() % gc::SystemPageSize() == 0);

    uint8_t* address = p.unwrap(/*safe - only reference*/);
    uint32_t allocSize = SharedArrayAllocSize(this->length);

    if (this->preparedForAsmJS) {
        numLive--;

        uint32_t mappedSize = SharedArrayMappedSize(allocSize);
        UnmapMemory(address, mappedSize);

# if defined(MOZ_VALGRIND) && defined(VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE)
        // Tell Valgrind/Memcheck to recommence reporting accesses in the
        // previously-inaccessible region.
        VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE(address, mappedSize);
# endif
    } else {
        UnmapMemory(address, allocSize);
    }
}
Exemplo n.º 3
0
void
SharedArrayRawBuffer::dropReference()
{
    // Normally if the refcount is zero then the memory will have been unmapped
    // and this test may just crash, but if the memory has been retained for any
    // reason we will catch the underflow here.
    MOZ_RELEASE_ASSERT(this->refcount_ > 0);

    // Drop the reference to the buffer.
    uint32_t refcount = --this->refcount_; // Atomic.
    if (refcount)
        return;

    // If this was the final reference, release the buffer.

#ifdef DEBUG
    liveBuffers_--;
#endif

    SharedMem<uint8_t*> p = this->dataPointerShared() - gc::SystemPageSize();
    MOZ_ASSERT(p.asValue() % gc::SystemPageSize() == 0);

    uint8_t* address = p.unwrap(/*safe - only reference*/);
    uint32_t allocSize = SharedArrayAllocSize(this->length);

    if (this->preparedForAsmJS) {
        numLive--;

        uint32_t mappedSize = SharedArrayMappedSize(allocSize);
        UnmapMemory(address, mappedSize);

# if defined(MOZ_VALGRIND) && defined(VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE)
        // Tell Valgrind/Memcheck to recommence reporting accesses in the
        // previously-inaccessible region.
        VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE(address, mappedSize);
# endif
    } else {
        UnmapMemory(address, allocSize);
    }
}