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84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
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// Copyright (c) 2013 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 "base/process/memory.h"
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#include <windows.h> // Must be in front of other Windows header files.
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#include <new.h>
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#include <psapi.h>
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#include <stddef.h>
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#if defined(__clang__)
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// This global constructor is trivial and non-racy (per being const).
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wglobal-constructors"
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#endif
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// malloc_unchecked is required to implement UncheckedMalloc properly.
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// It's provided by allocator_shim_win.cc but since that's not always present,
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// we provide a default that falls back to regular malloc.
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typedef void* (*MallocFn)(size_t);
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extern "C" void* (*const malloc_unchecked)(size_t);
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extern "C" void* (*const malloc_default)(size_t) = &malloc;
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#if defined(__clang__)
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#pragma clang diagnostic pop // -Wglobal-constructors
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#endif
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#if defined(_M_IX86)
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#pragma comment(linker, "/alternatename:_malloc_unchecked=_malloc_default")
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#elif defined(_M_X64) || defined(_M_ARM)
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#pragma comment(linker, "/alternatename:malloc_unchecked=malloc_default")
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#else
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#error Unsupported platform
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#endif
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namespace base {
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namespace {
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#pragma warning(push)
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#pragma warning(disable: 4702) // Unreachable code after the _exit.
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NOINLINE int OnNoMemory(size_t size) {
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// Kill the process. This is important for security since most of code
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// does not check the result of memory allocation.
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// https://msdn.microsoft.com/en-us/library/het71c37.aspx
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// Pass the size of the failed request in an exception argument.
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ULONG_PTR exception_args[] = {size};
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::RaiseException(win::kOomExceptionCode, EXCEPTION_NONCONTINUABLE,
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arraysize(exception_args), exception_args);
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// Safety check, make sure process exits here.
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_exit(win::kOomExceptionCode);
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return 0;
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}
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#pragma warning(pop)
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} // namespace
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void TerminateBecauseOutOfMemory(size_t size) {
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OnNoMemory(size);
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}
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void EnableTerminationOnHeapCorruption() {
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// Ignore the result code. Supported on XP SP3 and Vista.
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HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
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}
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void EnableTerminationOnOutOfMemory() {
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_set_new_handler(&OnNoMemory);
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_set_new_mode(1);
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}
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// Implemented using a weak symbol.
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bool UncheckedMalloc(size_t size, void** result) {
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*result = malloc_unchecked(size);
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return *result != NULL;
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}
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} // namespace base
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