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141 lines
4.1 KiB
C++
141 lines
4.1 KiB
C++
//===- Win32/MappedFile.cpp - Win32 MappedFile Implementation ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Jeff Cohen and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the Win32 implementation of the MappedFile concept.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only Win32 code.
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//===----------------------------------------------------------------------===//
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#include "Win32.h"
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#include "llvm/System/Process.h"
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namespace llvm {
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using namespace sys;
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struct sys::MappedFileInfo {
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HANDLE hFile;
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HANDLE hMapping;
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size_t size;
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};
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bool MappedFile::initialize(std::string* ErrMsg) {
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assert(!info_);
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info_ = new MappedFileInfo;
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info_->hFile = INVALID_HANDLE_VALUE;
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info_->hMapping = NULL;
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DWORD mode = options_ & WRITE_ACCESS ? GENERIC_WRITE : GENERIC_READ;
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DWORD disposition = options_ & WRITE_ACCESS ? OPEN_ALWAYS : OPEN_EXISTING;
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DWORD share = options_ & WRITE_ACCESS ? FILE_SHARE_WRITE : FILE_SHARE_READ;
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share = options_ & SHARED_MAPPING ? share : 0;
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info_->hFile = CreateFile(path_.c_str(), mode, share, NULL, disposition,
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FILE_ATTRIBUTE_NORMAL, NULL);
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if (info_->hFile == INVALID_HANDLE_VALUE) {
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delete info_;
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info_ = NULL;
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return MakeErrMsg(ErrMsg,
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std::string("Can't open file: ") + path_.toString());
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}
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LARGE_INTEGER size;
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if (!GetFileSizeEx(info_->hFile, &size) ||
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(info_->size = size_t(size.QuadPart), info_->size != size.QuadPart)) {
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CloseHandle(info_->hFile);
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delete info_;
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info_ = NULL;
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return MakeErrMsg(ErrMsg,
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std::string("Can't get size of file: ") + path_.toString());
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}
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return false;
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}
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void MappedFile::terminate() {
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unmap();
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if (info_->hFile != INVALID_HANDLE_VALUE)
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CloseHandle(info_->hFile);
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delete info_;
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info_ = NULL;
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}
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void MappedFile::unmap() {
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assert(info_ && "MappedFile not initialized");
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if (isMapped()) {
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UnmapViewOfFile(base_);
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base_ = NULL;
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}
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if (info_->hMapping != INVALID_HANDLE_VALUE) {
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CloseHandle(info_->hMapping);
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info_->hMapping = NULL;
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}
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}
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void* MappedFile::map(std::string* ErrMsg) {
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if (!isMapped()) {
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DWORD prot = PAGE_READONLY;
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if (options_ & EXEC_ACCESS)
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prot = SEC_IMAGE;
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else if (options_ & WRITE_ACCESS)
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prot = PAGE_READWRITE;
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info_->hMapping = CreateFileMapping(info_->hFile, NULL, prot, 0, 0, NULL);
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if (info_->hMapping == NULL) {
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MakeErrMsg(ErrMsg, std::string("Can't map file: ") + path_.toString());
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return 0;
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}
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prot = (options_ & WRITE_ACCESS) ? FILE_MAP_WRITE : FILE_MAP_READ;
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base_ = MapViewOfFileEx(info_->hMapping, prot, 0, 0, 0, NULL);
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if (base_ == NULL) {
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CloseHandle(info_->hMapping);
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info_->hMapping = NULL;
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MakeErrMsg(ErrMsg, std::string("Can't map file: ") + path_.toString());
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return 0;
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}
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}
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return base_;
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}
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size_t MappedFile::size() const {
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assert(info_ && "MappedFile not initialized");
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return info_->size;
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}
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bool MappedFile::size(size_t new_size, std::string* ErrMsg) {
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assert(info_ && "MappedFile not initialized");
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// Take the mapping out of memory.
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unmap();
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// Adjust the new_size to a page boundary.
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size_t pagesizem1 = Process::GetPageSize() - 1;
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new_size = (new_size + pagesizem1) & ~pagesizem1;
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// If the file needs to be extended, do so.
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if (new_size > info_->size) {
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LARGE_INTEGER eof;
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eof.QuadPart = new_size;
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if (!SetFilePointerEx(info_->hFile, eof, NULL, FILE_BEGIN))
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return MakeErrMsg(ErrMsg,
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std::string("Can't set end of file: ") + path_.toString());
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if (!SetEndOfFile(info_->hFile))
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return MakeErrMsg(ErrMsg,
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std::string("Can't set end of file: ") + path_.toString());
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info_->size = new_size;
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}
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// Remap the file.
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return map(ErrMsg);
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}
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}
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