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