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/*
* Copyright (C) 2005-2009, 2015-2016 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef WTF_FastMalloc_h
#define WTF_FastMalloc_h
#include <new>
#include <stdlib.h>
#include <wtf/StdLibExtras.h>
namespace WTF {
#if !defined(NDEBUG)
WTF_EXPORT_PRIVATE void fastSetMaxSingleAllocationSize(size_t);
#endif
class TryMallocReturnValue {
public:
TryMallocReturnValue(void*);
TryMallocReturnValue(TryMallocReturnValue&&);
~TryMallocReturnValue();
template<typename T> bool getValue(T*&) WARN_UNUSED_RETURN;
private:
void operator=(TryMallocReturnValue&&) = delete;
mutable void* m_data;
};
WTF_EXPORT_PRIVATE bool isFastMallocEnabled();
// These functions call CRASH() if an allocation fails.
WTF_EXPORT_PRIVATE void* fastMalloc(size_t) RETURNS_NONNULL;
WTF_EXPORT_PRIVATE void* fastZeroedMalloc(size_t) RETURNS_NONNULL;
WTF_EXPORT_PRIVATE void* fastCalloc(size_t numElements, size_t elementSize) RETURNS_NONNULL;
WTF_EXPORT_PRIVATE void* fastRealloc(void*, size_t) RETURNS_NONNULL;
WTF_EXPORT_PRIVATE char* fastStrDup(const char*) RETURNS_NONNULL;
WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastMalloc(size_t);
WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastZeroedMalloc(size_t);
WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastCalloc(size_t numElements, size_t elementSize);
WTF_EXPORT_PRIVATE void fastFree(void*);
// Allocations from fastAlignedMalloc() must be freed using fastAlignedFree().
WTF_EXPORT_PRIVATE void* fastAlignedMalloc(size_t alignment, size_t) RETURNS_NONNULL;
WTF_EXPORT_PRIVATE void* tryFastAlignedMalloc(size_t alignment, size_t);
WTF_EXPORT_PRIVATE void fastAlignedFree(void*);
WTF_EXPORT_PRIVATE size_t fastMallocSize(const void*);
// FIXME: This is non-helpful; fastMallocGoodSize will be removed soon.
WTF_EXPORT_PRIVATE size_t fastMallocGoodSize(size_t);
WTF_EXPORT_PRIVATE void releaseFastMallocFreeMemory();
WTF_EXPORT_PRIVATE void releaseFastMallocFreeMemoryForThisThread();
WTF_EXPORT_PRIVATE void fastCommitAlignedMemory(void*, size_t);
WTF_EXPORT_PRIVATE void fastDecommitAlignedMemory(void*, size_t);
struct FastMallocStatistics {
size_t reservedVMBytes;
size_t committedVMBytes;
size_t freeListBytes;
};
WTF_EXPORT_PRIVATE FastMallocStatistics fastMallocStatistics();
// This defines a type which holds an unsigned integer and is the same
// size as the minimally aligned memory allocation.
typedef unsigned long long AllocAlignmentInteger;
inline TryMallocReturnValue::TryMallocReturnValue(void* data)
: m_data(data)
{
}
inline TryMallocReturnValue::TryMallocReturnValue(TryMallocReturnValue&& source)
: m_data(source.m_data)
{
source.m_data = nullptr;
}
inline TryMallocReturnValue::~TryMallocReturnValue()
{
ASSERT(!m_data);
}
template<typename T> inline bool TryMallocReturnValue::getValue(T*& data)
{
data = static_cast<T*>(m_data);
m_data = nullptr;
return data;
}
// C++ STL allocator implementation. You can integrate fastMalloc into STL containers.
// e.g. std::unordered_map<Key, Value, std::hash<Key>, std::equal_to<Key>, FastAllocator<std::pair<const Key, Value>>>.
template<typename T>
class FastAllocator {
public:
using value_type = T;
FastAllocator() = default;
template<typename U> FastAllocator(const FastAllocator<U>&) { }
T* allocate(size_t count)
{
return reinterpret_cast<T*>(fastMalloc(sizeof(T) * count));
}
void deallocate(T* pointer, size_t)
{
fastFree(pointer);
}
#if defined(__GLIBCXX__) && (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE < 6)
// This allocator also supports pre-C++11 STL allocator interface. This is a workaround for GCC < 6, which std::list
// does not support C++11 allocator. Note that _GLIBCXX_RELEASE is only defined after GCC 7 release. So currently
// this workaround is enabled in GCC 6 too.
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55409
using pointer = value_type*;
using const_pointer = typename std::pointer_traits<pointer>::template rebind<value_type const>;
using void_pointer = typename std::pointer_traits<pointer>::template rebind<void>;
using const_void_pointer = typename std::pointer_traits<pointer>::template rebind<const void>;
using reference = T&;
using const_reference = const T&;
using difference_type = typename std::pointer_traits<pointer>::difference_type;
using size_type = std::make_unsigned_t<difference_type>;
template <class U> struct rebind {
using other = FastAllocator<U>;
};
value_type* allocate(std::size_t count, const_void_pointer)
{
return allocate(count);
}
template <class U, class ...Args>
void construct(U* p, Args&& ...args)
{
new (const_cast<void*>(static_cast<const void*>(p))) U(std::forward<Args>(args)...);
}
template <class U>
void destroy(U* p)
{
p->~U();
}
std::size_t max_size() const
{
return std::numeric_limits<size_type>::max();
}
FastAllocator<T> select_on_container_copy_construction() const
{
return *this;
}
using propagate_on_container_copy_assignment = std::false_type;
using propagate_on_container_move_assignment = std::false_type;
using propagate_on_container_swap = std::false_type;
using is_always_equal = std::is_empty<FastAllocator>;
#endif // defined(__GLIBCXX__) && (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE < 6)
};
template<typename T, typename U> inline bool operator==(const FastAllocator<T>&, const FastAllocator<U>&) { return true; }
template<typename T, typename U> inline bool operator!=(const FastAllocator<T>&, const FastAllocator<U>&) { return false; }
struct FastMalloc {
static void* malloc(size_t size) { return fastMalloc(size); }
static void* tryMalloc(size_t size)
{
auto result = tryFastMalloc(size);
void* realResult;
if (result.getValue(realResult))
return realResult;
return nullptr;
}
static void* realloc(void* p, size_t size) { return fastRealloc(p, size); }
static void free(void* p) { fastFree(p); }
};
template<typename T>
struct FastFree {
static_assert(std::is_trivially_destructible<T>::value, "");
void operator()(T* pointer) const
{
fastFree(const_cast<typename std::remove_cv<T>::type*>(pointer));
}
};
template<typename T>
struct FastFree<T[]> {
static_assert(std::is_trivially_destructible<T>::value, "");
void operator()(T* pointer) const
{
fastFree(const_cast<typename std::remove_cv<T>::type*>(pointer));
}
};
} // namespace WTF
#if !defined(NDEBUG)
using WTF::fastSetMaxSingleAllocationSize;
#endif
using WTF::FastAllocator;
using WTF::FastMalloc;
using WTF::FastFree;
using WTF::isFastMallocEnabled;
using WTF::fastCalloc;
using WTF::fastFree;
using WTF::fastMalloc;
using WTF::fastMallocGoodSize;
using WTF::fastMallocSize;
using WTF::fastRealloc;
using WTF::fastStrDup;
using WTF::fastZeroedMalloc;
using WTF::tryFastAlignedMalloc;
using WTF::tryFastCalloc;
using WTF::tryFastMalloc;
using WTF::tryFastZeroedMalloc;
using WTF::fastAlignedMalloc;
using WTF::fastAlignedFree;
#if COMPILER(GCC_OR_CLANG) && OS(DARWIN)
#define WTF_PRIVATE_INLINE __private_extern__ inline __attribute__((always_inline))
#elif COMPILER(GCC_OR_CLANG)
#define WTF_PRIVATE_INLINE inline __attribute__((always_inline))
#elif COMPILER(MSVC)
#define WTF_PRIVATE_INLINE __forceinline
#else
#define WTF_PRIVATE_INLINE inline
#endif
#define WTF_MAKE_FAST_ALLOCATED_IMPL \
void* operator new(size_t, void* p) { return p; } \
void* operator new[](size_t, void* p) { return p; } \
\
void* operator new(size_t size) \
{ \
return ::WTF::fastMalloc(size); \
} \
\
void operator delete(void* p) \
{ \
::WTF::fastFree(p); \
} \
\
void* operator new[](size_t size) \
{ \
return ::WTF::fastMalloc(size); \
} \
\
void operator delete[](void* p) \
{ \
::WTF::fastFree(p); \
} \
void* operator new(size_t, NotNullTag, void* location) \
{ \
ASSERT(location); \
return location; \
} \
#define WTF_MAKE_FAST_ALLOCATED \
public: \
WTF_MAKE_FAST_ALLOCATED_IMPL \
private: \
typedef int __thisIsHereToForceASemicolonAfterThisMacro
#define WTF_MAKE_STRUCT_FAST_ALLOCATED \
WTF_MAKE_FAST_ALLOCATED_IMPL \
typedef int __thisIsHereToForceASemicolonAfterThisMacro
#endif /* WTF_FastMalloc_h */