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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "courgette/memory_allocator.h"
#include <map>
#include "base/file_util.h"
#include "base/stringprintf.h"
#ifdef OS_WIN
// A helper function to help diagnose failures we've seen in the field.
// The function constructs a string containing the error and throws a runtime
// exception. The calling convention is set to stdcall to force argument
// passing via the stack.
__declspec(noinline)
void __stdcall RuntimeError(DWORD err) {
char buffer[20] = {0};
wsprintfA(buffer, "err: %u", err);
throw buffer;
}
namespace courgette {
// TempFile
TempFile::TempFile() : file_(base::kInvalidPlatformFileValue), size_(0) {
}
TempFile::~TempFile() {
Close();
}
FilePath TempFile::PrepareTempFile() {
FilePath path;
if (!file_util::CreateTemporaryFile(&path))
RuntimeError(::GetLastError());
return path;
}
void TempFile::Close() {
if (valid()) {
base::ClosePlatformFile(file_);
file_ = base::kInvalidPlatformFileValue;
size_ = 0;
}
}
void TempFile::Create() {
DCHECK(file_ == base::kInvalidPlatformFileValue);
FilePath path(PrepareTempFile());
bool created = false;
base::PlatformFileError error_code = base::PLATFORM_FILE_OK;
int flags = base::PLATFORM_FILE_OPEN_ALWAYS | base::PLATFORM_FILE_READ |
base::PLATFORM_FILE_WRITE |
base::PLATFORM_FILE_DELETE_ON_CLOSE |
base::PLATFORM_FILE_TEMPORARY;
file_ = base::CreatePlatformFile(path, flags, &created, &error_code);
if (file_ == base::kInvalidPlatformFileValue)
RuntimeError(error_code);
}
bool TempFile::valid() const {
return file_ != base::kInvalidPlatformFileValue;
}
base::PlatformFile TempFile::handle() const {
return file_;
}
size_t TempFile::size() const {
return size_;
}
void TempFile::SetSize(size_t size) {
bool set = base::TruncatePlatformFile(file_, size);
if (!set)
RuntimeError(::GetLastError());
size_ = size;
}
// FileMapping
FileMapping::FileMapping() : mapping_(NULL), view_(NULL) {
}
FileMapping::~FileMapping() {
Close();
}
void FileMapping::InitializeView(size_t size) {
DCHECK(view_ == NULL);
DCHECK(mapping_ != NULL);
view_ = ::MapViewOfFile(mapping_, FILE_MAP_WRITE, 0, 0, size);
if (!view_)
RuntimeError(::GetLastError());
}
void FileMapping::Create(HANDLE file, size_t size) {
DCHECK(file != INVALID_HANDLE_VALUE);
DCHECK(!valid());
mapping_ = ::CreateFileMapping(file, NULL, PAGE_READWRITE, 0, 0, NULL);
if (!mapping_)
RuntimeError(::GetLastError());
InitializeView(size);
}
void FileMapping::Close() {
if (view_)
::UnmapViewOfFile(view_);
if (mapping_)
::CloseHandle(mapping_);
mapping_ = NULL;
view_ = NULL;
}
bool FileMapping::valid() const {
return view_ != NULL;
}
void* FileMapping::view() const {
return view_;
}
// TempMapping
TempMapping::TempMapping() {
}
TempMapping::~TempMapping() {
}
void TempMapping::Initialize(size_t size) {
// TODO(tommi): The assumption here is that the alignment of pointers (this)
// is as strict or stricter than the alignment of the element type. This is
// not always true, e.g. __m128 has 16-byte alignment.
size += sizeof(this);
file_.Create();
file_.SetSize(size);
mapping_.Create(file_.handle(), size);
TempMapping** write = reinterpret_cast<TempMapping**>(mapping_.view());
write[0] = this;
}
void* TempMapping::memory() const {
uint8* mem = reinterpret_cast<uint8*>(mapping_.view());
if (mem)
mem += sizeof(this);
DCHECK(mem);
return mem;
}
// static
TempMapping* TempMapping::GetMappingFromPtr(void* mem) {
TempMapping* ret = NULL;
if (mem) {
ret = reinterpret_cast<TempMapping**>(mem)[-1];
}
DCHECK(ret);
return ret;
}
} // namespace courgette
#endif // OS_WIN
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