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
}
}
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);
}
}
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);
}
}