18d856e54b
The new libc++_static.a platform prebuilt prefers to use this C11 function rather than the non-standard memalign. Bug: http://b/175635923 Test: treehugger Change-Id: I9c181568ba69c0508e400baac2cbb42b169c9768
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
/*
|
|
* Copyright (C) 2015 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "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 THE
|
|
* COPYRIGHT OWNER 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 "private/bionic_allocator.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <sys/cdefs.h>
|
|
#include <unistd.h>
|
|
|
|
#include <atomic>
|
|
|
|
#include <async_safe/log.h>
|
|
|
|
static BionicAllocator g_bionic_allocator;
|
|
static std::atomic<pid_t> fallback_tid(0);
|
|
|
|
// Used by libdebuggerd_handler to switch allocators during a crash dump, in
|
|
// case the linker heap is corrupted. Do not use this function.
|
|
extern "C" bool __linker_enable_fallback_allocator() {
|
|
pid_t expected = 0;
|
|
return fallback_tid.compare_exchange_strong(expected, gettid());
|
|
}
|
|
|
|
extern "C" void __linker_disable_fallback_allocator() {
|
|
pid_t previous = fallback_tid.exchange(0);
|
|
if (previous == 0) {
|
|
async_safe_fatal("attempted to disable unused fallback allocator");
|
|
} else if (previous != gettid()) {
|
|
async_safe_fatal("attempted to disable fallback allocator in use by another thread (%d)",
|
|
previous);
|
|
}
|
|
}
|
|
|
|
static BionicAllocator& get_fallback_allocator() {
|
|
static BionicAllocator fallback_allocator;
|
|
return fallback_allocator;
|
|
}
|
|
|
|
static BionicAllocator& get_allocator() {
|
|
if (__predict_false(fallback_tid) && __predict_false(gettid() == fallback_tid)) {
|
|
return get_fallback_allocator();
|
|
}
|
|
return g_bionic_allocator;
|
|
}
|
|
|
|
void* malloc(size_t byte_count) {
|
|
return get_allocator().alloc(byte_count);
|
|
}
|
|
|
|
void* memalign(size_t alignment, size_t byte_count) {
|
|
return get_allocator().memalign(alignment, byte_count);
|
|
}
|
|
|
|
void* aligned_alloc(size_t alignment, size_t byte_count) {
|
|
return get_allocator().memalign(alignment, byte_count);
|
|
}
|
|
|
|
void* calloc(size_t item_count, size_t item_size) {
|
|
return get_allocator().alloc(item_count*item_size);
|
|
}
|
|
|
|
void* realloc(void* p, size_t byte_count) {
|
|
return get_allocator().realloc(p, byte_count);
|
|
}
|
|
|
|
void* reallocarray(void* p, size_t item_count, size_t item_size) {
|
|
size_t byte_count;
|
|
if (__builtin_mul_overflow(item_count, item_size, &byte_count)) {
|
|
errno = ENOMEM;
|
|
return nullptr;
|
|
}
|
|
return get_allocator().realloc(p, byte_count);
|
|
}
|
|
|
|
void free(void* ptr) {
|
|
get_allocator().free(ptr);
|
|
}
|