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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include <stddef.h>
- #include <stdlib.h>
- #include <tuple>
- #include "base/debug/alias.h"
- #include "base/process/memory.h"
- #include "build/build_config.h"
- #include "third_party/skia/include/core/SkTypes.h"
- #include "third_party/skia/include/private/SkMalloc.h"
- #if BUILDFLAG(IS_WIN)
- #include <windows.h>
- #endif
- // This implementation of sk_malloc_flags() and friends is similar to
- // SkMemory_malloc.cpp, except it uses base::UncheckedMalloc and friends
- // for non-SK_MALLOC_THROW calls.
- //
- // The name of this file is historic: a previous implementation tried to
- // use std::set_new_handler() for the same effect, but it didn't actually work.
- static inline void* throw_on_failure(size_t size, void* p) {
- if (size > 0 && p == NULL) {
- // If we've got a NULL here, the only reason we should have failed is running out of RAM.
- sk_out_of_memory();
- }
- return p;
- }
- void sk_abort_no_print() {
- // Linker's ICF feature may merge this function with other functions with
- // the same definition (e.g. any function whose sole job is to call abort())
- // and it may confuse the crash report processing system.
- // http://crbug.com/860850
- static int static_variable_to_make_this_function_unique = 0x736b; // "sk"
- base::debug::Alias(&static_variable_to_make_this_function_unique);
- abort();
- }
- void sk_out_of_memory(void) {
- SkASSERT(!"sk_out_of_memory");
- base::TerminateBecauseOutOfMemory(0);
- // Extra safety abort().
- abort();
- }
- void* sk_realloc_throw(void* addr, size_t size) {
- return throw_on_failure(size, realloc(addr, size));
- }
- void sk_free(void* p) {
- if (p) {
- free(p);
- }
- }
- // We get lots of bugs filed on us that amount to overcommiting bitmap memory,
- // then some time later failing to back that VM with physical memory.
- // They're hard to track down, so in Debug mode we touch all memory right up front.
- //
- // For malloc, fill is an arbitrary byte and ideally not 0. For calloc, it's got to be 0.
- static void* prevent_overcommit(int fill, size_t size, void* p) {
- // We probably only need to touch one byte per page, but memset makes things easy.
- SkDEBUGCODE(memset(p, fill, size));
- return p;
- }
- static void* malloc_throw(size_t size) {
- return prevent_overcommit(0x42, size, throw_on_failure(size, malloc(size)));
- }
- static void* malloc_nothrow(size_t size) {
- // TODO(b.kelemen): we should always use UncheckedMalloc but currently it
- // doesn't work as intended everywhere.
- void* result;
- #if BUILDFLAG(IS_IOS)
- result = malloc(size);
- #else
- // It's the responsibility of the caller to check the return value.
- std::ignore = base::UncheckedMalloc(size, &result);
- #endif
- if (result) {
- prevent_overcommit(0x47, size, result);
- }
- return result;
- }
- static void* calloc_throw(size_t size) {
- return prevent_overcommit(0, size, throw_on_failure(size, calloc(size, 1)));
- }
- static void* calloc_nothrow(size_t size) {
- // TODO(b.kelemen): we should always use UncheckedCalloc but currently it
- // doesn't work as intended everywhere.
- void* result;
- #if BUILDFLAG(IS_IOS)
- result = calloc(1, size);
- #else
- // It's the responsibility of the caller to check the return value.
- std::ignore = base::UncheckedCalloc(size, 1, &result);
- #endif
- if (result) {
- prevent_overcommit(0, size, result);
- }
- return result;
- }
- void* sk_malloc_flags(size_t size, unsigned flags) {
- if (flags & SK_MALLOC_ZERO_INITIALIZE) {
- if (flags & SK_MALLOC_THROW) {
- return calloc_throw(size);
- } else {
- return calloc_nothrow(size);
- }
- } else {
- if (flags & SK_MALLOC_THROW) {
- return malloc_throw(size);
- } else {
- return malloc_nothrow(size);
- }
- }
- }
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