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IsoMallocFallback.cpp
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113 lines (101 loc) · 3.5 KB
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/*
* Copyright (C) 2017-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "IsoMallocFallback.h"
#include "DebugHeap.h"
#include "Environment.h"
#include "bmalloc.h"
namespace bmalloc { namespace IsoMallocFallback {
MallocFallbackState mallocFallbackState;
namespace {
void determineMallocFallbackState()
{
static std::once_flag onceFlag;
std::call_once(
onceFlag,
[] {
if (mallocFallbackState != MallocFallbackState::Undecided)
return;
if (Environment::get()->isDebugHeapEnabled()) {
mallocFallbackState = MallocFallbackState::FallBackToMalloc;
return;
}
const char* env = getenv("bmalloc_IsoHeap");
if (env && (!strcasecmp(env, "false") || !strcasecmp(env, "no") || !strcmp(env, "0")))
mallocFallbackState = MallocFallbackState::FallBackToMalloc;
else
mallocFallbackState = MallocFallbackState::DoNotFallBack;
});
}
} // anonymous namespace
MallocResult tryMalloc(
size_t size
#if BENABLE_MALLOC_HEAP_BREAKDOWN
, malloc_zone_t* zone = nullptr
#endif
)
{
for (;;) {
switch (mallocFallbackState) {
case MallocFallbackState::Undecided:
determineMallocFallbackState();
continue;
case MallocFallbackState::FallBackToMalloc:
#if BENABLE_MALLOC_HEAP_BREAKDOWN
return malloc_zone_malloc(zone, size);
#else
return api::tryMalloc(size);
#endif
case MallocFallbackState::DoNotFallBack:
return MallocResult();
}
RELEASE_BASSERT_NOT_REACHED();
}
}
bool tryFree(
void* ptr
#if BENABLE_MALLOC_HEAP_BREAKDOWN
, malloc_zone_t* zone = nullptr
#endif
)
{
for (;;) {
switch (mallocFallbackState) {
case MallocFallbackState::Undecided:
determineMallocFallbackState();
continue;
case MallocFallbackState::FallBackToMalloc:
#if BENABLE_MALLOC_HEAP_BREAKDOWN
malloc_zone_free(zone, ptr);
#else
api::free(ptr);
#endif
return true;
case MallocFallbackState::DoNotFallBack:
return false;
}
RELEASE_BASSERT_NOT_REACHED();
}
}
} } // namespace bmalloc::IsoMallocFallback