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// Copyright 2013 The Chromium Authors
// 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 <windows.h> // Must be in front of other Windows header files.
#include <new.h>
#include <psapi.h>
#include <stddef.h>
#include <stdlib.h>
#if defined(__clang__)
// This global constructor is trivial and non-racy (per being const).
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wglobal-constructors"
#endif
// 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(__clang__)
#pragma clang diagnostic pop // -Wglobal-constructors
#endif
#if defined(_M_IX86)
#pragma comment(linker, "/alternatename:_malloc_unchecked=_malloc_default")
#elif defined(_M_X64) || defined(_M_ARM) || defined(_M_ARM64)
#pragma comment(linker, "/alternatename:malloc_unchecked=malloc_default")
#else
#error Unsupported platform
#endif
namespace base {
namespace {
// Return a non-0 value to retry the allocation.
int ReleaseReservationOrTerminate(size_t size) {
constexpr int kRetryAllocation = 1;
if (internal::ReleaseAddressSpaceReservation())
return kRetryAllocation;
TerminateBecauseOutOfMemory(size);
return 0;
}
} // namespace
void EnableTerminationOnHeapCorruption() {
// Ignore the result code. Supported on XP SP3 and Vista.
HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
}
void EnableTerminationOnOutOfMemory() {
constexpr int kCallNewHandlerOnAllocationFailure = 1;
_set_new_handler(&ReleaseReservationOrTerminate);
_set_new_mode(kCallNewHandlerOnAllocationFailure);
}
// Implemented using a weak symbol.
bool UncheckedMalloc(size_t size, void** result) {
*result = malloc_unchecked(size);
return *result != NULL;
}
void UncheckedFree(void* ptr) {
free(ptr);
}
} // namespace base
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