| /* |
| * 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 |