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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc.
#include "core/fxcrt/fx_system.h"
#ifdef __cplusplus
extern "C" {
// For external C libraries to malloc through PDFium. These may return nullptr.
void* FXMEM_DefaultAlloc(size_t byte_size);
void* FXMEM_DefaultCalloc(size_t num_elems, size_t byte_size);
void* FXMEM_DefaultRealloc(void* pointer, size_t new_size);
void FXMEM_DefaultFree(void* pointer);
#ifdef __cplusplus
} // extern "C"
#include <stdlib.h>
#include <limits>
#include <memory>
#include <new>
#include "core/fxcrt/fx_safe_types.h"
#include "third_party/base/allocator/partition_allocator/partition_alloc.h"
extern pdfium::base::PartitionAllocatorGeneric gArrayBufferPartitionAllocator;
extern pdfium::base::PartitionAllocatorGeneric gGeneralPartitionAllocator;
extern pdfium::base::PartitionAllocatorGeneric gStringPartitionAllocator;
void FXMEM_InitializePartitionAlloc();
NEVER_INLINE void FX_OutOfMemoryTerminate();
inline void* FX_SafeAlloc(size_t num_members, size_t member_size) {
FX_SAFE_SIZE_T total = member_size;
total *= num_members;
if (!total.IsValid())
return nullptr;
void* result = pdfium::base::PartitionAllocGenericFlags(
gGeneralPartitionAllocator.root(), pdfium::base::PartitionAllocReturnNull,
total.ValueOrDie(), "GeneralPartition");
if (result)
memset(result, 0, total.ValueOrDie());
return result;
inline void* FX_SafeRealloc(void* ptr, size_t num_members, size_t member_size) {
FX_SAFE_SIZE_T size = num_members;
size *= member_size;
if (!size.IsValid())
return nullptr;
return pdfium::base::PartitionReallocGenericFlags(
gGeneralPartitionAllocator.root(), pdfium::base::PartitionAllocReturnNull,
ptr, size.ValueOrDie(), "GeneralPartition");
inline void* FX_AllocOrDie(size_t num_members, size_t member_size) {
// TODO(tsepez): See if we can avoid the implicit memset(0).
void* result = FX_SafeAlloc(num_members, member_size);
if (!result)
FX_OutOfMemoryTerminate(); // Never returns.
return result;
inline void* FX_AllocOrDie2D(size_t w, size_t h, size_t member_size) {
if (w >= std::numeric_limits<size_t>::max() / h)
FX_OutOfMemoryTerminate(); // Never returns.
return FX_AllocOrDie(w * h, member_size);
inline void* FX_ReallocOrDie(void* ptr,
size_t num_members,
size_t member_size) {
void* result = FX_SafeRealloc(ptr, num_members, member_size);
if (!result)
FX_OutOfMemoryTerminate(); // Never returns.
return result;
// These never return nullptr.
#define FX_Alloc(type, size) \
static_cast<type*>(FX_AllocOrDie(size, sizeof(type)))
#define FX_Alloc2D(type, w, h) \
static_cast<type*>(FX_AllocOrDie2D(w, h, sizeof(type)))
#define FX_Realloc(type, ptr, size) \
static_cast<type*>(FX_ReallocOrDie(ptr, size, sizeof(type)))
// May return nullptr.
#define FX_TryAlloc(type, size) \
static_cast<type*>(FX_SafeAlloc(size, sizeof(type)))
#define FX_TryRealloc(type, ptr, size) \
static_cast<type*>(FX_SafeRealloc(ptr, size, sizeof(type)))
inline void FX_Free(void* ptr) {
// TODO(palmer): Removing this check exposes crashes when PDFium callers
// attempt to free |nullptr|. Although libc's |free| allows freeing |NULL|, no
// other Partition Alloc callers need this tolerant behavior. Additionally,
// checking for |nullptr| adds a branch to |PartitionFree|, and it's nice to
// not have to have that.
// So this check is hiding (what I consider to be) bugs, and we should try to
// fix them.
if (ptr)
// The FX_ArraySize(arr) macro returns the # of elements in an array arr.
// The expression is a compile-time constant, and therefore can be
// used in defining new arrays, for example. If you use FX_ArraySize on
// a pointer by mistake, you will get a compile-time error.
// One caveat is that FX_ArraySize() doesn't accept any array of an
// anonymous type or a type defined inside a function.
#define FX_ArraySize(array) (sizeof(ArraySizeHelper(array)))
// This template function declaration is used in defining FX_ArraySize.
// Note that the function doesn't need an implementation, as we only
// use its type.
template <typename T, size_t N>
char (&ArraySizeHelper(T (&array)[N]))[N];
// Round up to the power-of-two boundary N.
template <int N, typename T>
inline T FxAlignToBoundary(T size) {
static_assert(N > 0 && (N & (N - 1)) == 0, "Not non-zero power of two");
return (size + N - 1) & ~(N - 1);
// Used with std::unique_ptr to FX_Free raw memory.
struct FxFreeDeleter {
inline void operator()(void* ptr) const { FX_Free(ptr); }
#endif // __cplusplus