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