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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
namespace sw {
namespace {
struct Allocation
{
// size_t bytes;
unsigned char *block;
};
void *allocateRaw(size_t bytes, size_t alignment)
{
ASSERT((alignment & (alignment - 1)) == 0); // Power of 2 alignment.
#if defined(LINUX_ENABLE_NAMED_MMAP)
if(alignment < sizeof(void *))
{
return malloc(bytes);
}
else
{
void *allocation;
int result = posix_memalign(&allocation, alignment, bytes);
if(result != 0)
{
errno = result;
allocation = nullptr;
}
return allocation;
}
#else
unsigned char *block = (unsigned char *)malloc(bytes + sizeof(Allocation) + alignment);
unsigned char *aligned = nullptr;
if(block)
{
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;
#endif
}
} // anonymous namespace
size_t memoryPageSize()
{
static int pageSize = 0;
if(pageSize == 0)
{
#if defined(_WIN32)
SYSTEM_INFO systemInfo;
GetSystemInfo(&systemInfo);
pageSize = systemInfo.dwPageSize;
#else
pageSize = sysconf(_SC_PAGESIZE);
#endif
}
return pageSize;
}
void *allocate(size_t bytes, size_t alignment)
{
void *memory = allocateRaw(bytes, alignment);
if(memory)
{
memset(memory, 0, bytes);
}
return memory;
}
void deallocate(void *memory)
{
#if defined(LINUX_ENABLE_NAMED_MMAP)
free(memory);
#else
if(memory)
{
unsigned char *aligned = (unsigned char *)memory;
Allocation *allocation = (Allocation *)(aligned - sizeof(Allocation));
free(allocation->block);
}
#endif
}
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