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102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <stdlib.h>
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#include "base/process/memory.h"
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#include "third_party/skia/include/core/SkTypes.h"
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// This implementation of sk_malloc_flags() and friends is similar to
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// SkMemory_malloc.cpp, except it uses base::UncheckedMalloc and friends
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// for non-SK_MALLOC_THROW calls.
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//
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// The name of this file is historic: a previous implementation tried to
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// use std::set_new_handler() for the same effect, but it didn't actually work.
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static inline void* throw_on_failure(size_t size, void* p) {
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if (size > 0 && p == NULL) {
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// If we've got a NULL here, the only reason we should have failed is running out of RAM.
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sk_out_of_memory();
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}
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return p;
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}
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void sk_abort_no_print() {
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abort();
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}
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void sk_out_of_memory(void) {
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SkASSERT(!"sk_out_of_memory");
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abort();
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}
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void* sk_realloc_throw(void* addr, size_t size) {
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return throw_on_failure(size, realloc(addr, size));
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}
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void sk_free(void* p) {
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if (p) {
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free(p);
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}
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}
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// We get lots of bugs filed on us that amount to overcommiting bitmap memory,
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// then some time later failing to back that VM with physical memory.
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// They're hard to track down, so in Debug mode we touch all memory right up front.
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//
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// For malloc, fill is an arbitrary byte and ideally not 0. For calloc, it's got to be 0.
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static void* prevent_overcommit(int fill, size_t size, void* p) {
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// We probably only need to touch one byte per page, but memset makes things easy.
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SkDEBUGCODE(memset(p, fill, size));
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return p;
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}
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void* sk_malloc_throw(size_t size) {
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return prevent_overcommit(0x42, size, throw_on_failure(size, malloc(size)));
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}
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static void* sk_malloc_nothrow(size_t size) {
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// TODO(b.kelemen): we should always use UncheckedMalloc but currently it
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// doesn't work as intended everywhere.
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void* result;
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#if defined(OS_IOS)
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result = malloc(size);
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#else
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// It's the responsibility of the caller to check the return value.
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ignore_result(base::UncheckedMalloc(size, &result));
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#endif
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if (result) {
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prevent_overcommit(0x47, size, result);
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}
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return result;
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}
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void* sk_malloc_flags(size_t size, unsigned flags) {
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if (flags & SK_MALLOC_THROW) {
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return sk_malloc_throw(size);
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}
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return sk_malloc_nothrow(size);
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}
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void* sk_calloc_throw(size_t size) {
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return prevent_overcommit(0, size, throw_on_failure(size, calloc(size, 1)));
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}
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void* sk_calloc(size_t size) {
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// TODO(b.kelemen): we should always use UncheckedCalloc but currently it
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// doesn't work as intended everywhere.
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void* result;
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#if defined(OS_IOS)
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result = calloc(1, size);
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#else
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// It's the responsibility of the caller to check the return value.
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ignore_result(base::UncheckedCalloc(size, 1, &result));
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#endif
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if (result) {
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prevent_overcommit(0, size, result);
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}
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return result;
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}
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