// 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. http://www.foxitsoftware.com
|
|
#ifndef CORE_FXCRT_INCLUDE_FX_MEMORY_H_
|
#define CORE_FXCRT_INCLUDE_FX_MEMORY_H_
|
|
#include "core/fxcrt/include/fx_system.h"
|
|
#ifdef __cplusplus
|
extern "C" {
|
#endif
|
|
// For external C libraries to malloc through PDFium. These may return nullptr.
|
void* FXMEM_DefaultAlloc(size_t byte_size, int flags);
|
void* FXMEM_DefaultRealloc(void* pointer, size_t new_size, int flags);
|
void FXMEM_DefaultFree(void* pointer, int flags);
|
|
#ifdef __cplusplus
|
} // extern "C"
|
|
#include <stdlib.h>
|
#include <limits>
|
#include <new>
|
|
NEVER_INLINE void FX_OutOfMemoryTerminate();
|
|
inline void* FX_SafeRealloc(void* ptr, size_t num_members, size_t member_size) {
|
if (num_members < std::numeric_limits<size_t>::max() / member_size) {
|
return realloc(ptr, num_members * member_size);
|
}
|
return nullptr;
|
}
|
|
inline void* FX_AllocOrDie(size_t num_members, size_t member_size) {
|
// TODO(tsepez): See if we can avoid the implicit memset(0).
|
if (void* result = calloc(num_members, member_size)) {
|
return result;
|
}
|
FX_OutOfMemoryTerminate(); // Never returns.
|
return nullptr; // Suppress compiler warning.
|
}
|
|
inline void* FX_AllocOrDie2D(size_t w, size_t h, size_t member_size) {
|
if (w < std::numeric_limits<size_t>::max() / h) {
|
return FX_AllocOrDie(w * h, member_size);
|
}
|
FX_OutOfMemoryTerminate(); // Never returns.
|
return nullptr; // Suppress compiler warning.
|
}
|
|
inline void* FX_ReallocOrDie(void* ptr,
|
size_t num_members,
|
size_t member_size) {
|
if (void* result = FX_SafeRealloc(ptr, num_members, member_size)) {
|
return result;
|
}
|
FX_OutOfMemoryTerminate(); // Never returns.
|
return nullptr; // Suppress compiler warning.
|
}
|
|
// Never returns nullptr.
|
#define FX_Alloc(type, size) (type*) FX_AllocOrDie(size, sizeof(type))
|
#define FX_Alloc2D(type, w, h) (type*) FX_AllocOrDie2D(w, h, sizeof(type))
|
#define FX_Realloc(type, ptr, size) \
|
(type*) FX_ReallocOrDie(ptr, size, sizeof(type))
|
|
// May return nullptr.
|
#define FX_TryAlloc(type, size) (type*) calloc(size, sizeof(type))
|
#define FX_TryRealloc(type, ptr, size) \
|
(type*) FX_SafeRealloc(ptr, size, sizeof(type))
|
|
#define FX_Free(ptr) free(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];
|
|
// Used with std::unique_ptr to FX_Free raw memory.
|
struct FxFreeDeleter {
|
inline void operator()(void* ptr) const { FX_Free(ptr); }
|
};
|
|
// Used with std::unique_ptr to Release() objects that can't be deleted.
|
template <class T>
|
struct ReleaseDeleter {
|
inline void operator()(T* ptr) const { ptr->Release(); }
|
};
|
|
class CFX_Deletable {
|
public:
|
virtual ~CFX_Deletable() {}
|
};
|
|
#endif // __cplusplus
|
|
#endif // CORE_FXCRT_INCLUDE_FX_MEMORY_H_
|
