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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "Memory.hpp"
#include "Debug.hpp"
#include "Types.hpp"
#if defined(_WIN32)
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# include <intrin.h>
#else
# include <errno.h>
# include <sys/mman.h>
# include <stdlib.h>
# include <unistd.h>
#endif
#include <cstdlib>
#include <cstring>
#undef allocate
#undef deallocate
#if(defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)) && !defined(__x86__)
# define __x86__
#endif
// A Clang extension to determine compiler features.
// We use it to detect Sanitizer builds (e.g. -fsanitize=memory).
#ifndef __has_feature
# define __has_feature(x) 0
#endif
namespace sw {
namespace {
struct Allocation
{
// size_t bytes;
unsigned char *block;
};
} // anonymous namespace
size_t memoryPageSize()
{
static int pageSize = [] {
#if defined(_WIN32)
SYSTEM_INFO systemInfo;
GetSystemInfo(&systemInfo);
return systemInfo.dwPageSize;
#else
return sysconf(_SC_PAGESIZE);
#endif
}();
return pageSize;
}
static void *allocate(size_t bytes, size_t alignment, bool clearToZero)
{
ASSERT((alignment & (alignment - 1)) == 0); // Power of 2 alignment.
size_t size = bytes + sizeof(Allocation) + alignment;
unsigned char *block = (unsigned char *)malloc(size);
unsigned char *aligned = nullptr;
if(block)
{
if(clearToZero)
{
memset(block, 0, size);
}
aligned = (unsigned char *)((uintptr_t)(block + sizeof(Allocation) + alignment - 1) & -(intptr_t)alignment);
Allocation *allocation = (Allocation *)(aligned - sizeof(Allocation));
// allocation->bytes = bytes;
allocation->block = block;
}
return aligned;
}
// TODO(b/140991626): Rename to allocate().
void *allocateUninitialized(size_t bytes, size_t alignment)
{
return allocate(bytes, alignment, false);
}
void *allocateZero(size_t bytes, size_t alignment)
{
return allocate(bytes, alignment, true);
}
// This funtion allocates memory that is zero-initialized for security reasons
// only. In MemorySanitizer enabled builds it is left uninitialized.
void *allocateZeroOrPoison(size_t bytes, size_t alignment)
{
return allocate(bytes, alignment, !__has_feature(memory_sanitizer));
}
void freeMemory(void *memory)
{
if(memory)
{
unsigned char *aligned = (unsigned char *)memory;
Allocation *allocation = (Allocation *)(aligned - sizeof(Allocation));
free(allocation->block);
}
}
void clear(uint16_t *memory, uint16_t element, size_t count)
{
#if defined(_MSC_VER) && defined(__x86__) && !defined(MEMORY_SANITIZER)
__stosw(memory, element, count);
#elif defined(__GNUC__) && defined(__x86__) && !defined(MEMORY_SANITIZER)
__asm__ __volatile__("rep stosw"
: "+D"(memory), "+c"(count)
: "a"(element)
: "memory");
#else
for(size_t i = 0; i < count; i++)
{
memory[i] = element;
}
#endif
}
void clear(uint32_t *memory, uint32_t element, size_t count)
{
#if defined(_MSC_VER) && defined(__x86__) && !defined(MEMORY_SANITIZER)
__stosd((unsigned long *)memory, element, count);
#elif defined(__GNUC__) && defined(__x86__) && !defined(MEMORY_SANITIZER)
__asm__ __volatile__("rep stosl"
: "+D"(memory), "+c"(count)
: "a"(element)
: "memory");
#else
for(size_t i = 0; i < count; i++)
{
memory[i] = element;
}
#endif
}
} // namespace sw