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95 lines
3.1 KiB
95 lines
3.1 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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* 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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "private/bionic_allocator.h"
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#include <stdlib.h>
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#include <sys/cdefs.h>
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#include <unistd.h>
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#include <atomic>
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#include <async_safe/log.h>
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static BionicAllocator g_bionic_allocator;
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static std::atomic<pid_t> fallback_tid(0);
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// Used by libdebuggerd_handler to switch allocators during a crash dump, in
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// case the linker heap is corrupted. Do not use this function.
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extern "C" bool __linker_enable_fallback_allocator() {
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pid_t expected = 0;
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return fallback_tid.compare_exchange_strong(expected, gettid());
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}
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extern "C" void __linker_disable_fallback_allocator() {
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pid_t previous = fallback_tid.exchange(0);
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if (previous == 0) {
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async_safe_fatal("attempted to disable unused fallback allocator");
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} else if (previous != gettid()) {
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async_safe_fatal("attempted to disable fallback allocator in use by another thread (%d)",
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previous);
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}
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}
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static BionicAllocator& get_fallback_allocator() {
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static BionicAllocator fallback_allocator;
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return fallback_allocator;
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}
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static BionicAllocator& get_allocator() {
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if (__predict_false(fallback_tid) && __predict_false(gettid() == fallback_tid)) {
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return get_fallback_allocator();
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}
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return g_bionic_allocator;
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}
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void* malloc(size_t byte_count) {
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return get_allocator().alloc(byte_count);
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}
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void* calloc(size_t item_count, size_t item_size) {
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return get_allocator().alloc(item_count*item_size);
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}
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void* realloc(void* p, size_t byte_count) {
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return get_allocator().realloc(p, byte_count);
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}
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void* reallocarray(void* p, size_t item_count, size_t item_size) {
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size_t byte_count;
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if (__builtin_mul_overflow(item_count, item_size, &byte_count)) {
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errno = ENOMEM;
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return nullptr;
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}
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return get_allocator().realloc(p, byte_count);
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}
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void free(void* ptr) {
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get_allocator().free(ptr);
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}
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