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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "linker_allocator.h"
#include <stdlib.h>
#include <sys/cdefs.h>
#include <unistd.h>
#include "private/libc_logging.h"
static LinkerMemoryAllocator g_linker_allocator;
static 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" void __linker_use_fallback_allocator() {
if (fallback_tid != 0) {
__libc_format_log(ANDROID_LOG_ERROR, "libc",
"attempted to set fallback allocator multiple times");
return;
}
fallback_tid = gettid();
}
static LinkerMemoryAllocator& get_fallback_allocator() {
static LinkerMemoryAllocator fallback_allocator;
return fallback_allocator;
}
static LinkerMemoryAllocator& get_allocator() {
if (__predict_false(fallback_tid) && __predict_false(gettid() == fallback_tid)) {
return get_fallback_allocator();
}
return g_linker_allocator;
}
void* malloc(size_t byte_count) {
return get_allocator().alloc(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 free(void* ptr) {
get_allocator().free(ptr);
}
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