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155 lines
3.9 KiB
C++
155 lines
3.9 KiB
C++
//===- Unix/MappedFile.cpp - Unix 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 is distributed under the University of Illinois Open Source
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// 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 generic Unix 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 generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/System/Process.h"
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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namespace llvm {
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using namespace sys;
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struct sys::MappedFileInfo {
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int FD;
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off_t Size;
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};
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bool MappedFile::initialize(std::string* ErrMsg) {
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int mode = 0;
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if (options_ & READ_ACCESS)
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if (options_ & WRITE_ACCESS)
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mode = O_RDWR;
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else
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mode = O_RDONLY;
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else if (options_ & WRITE_ACCESS)
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mode = O_WRONLY;
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int FD = ::open(path_.c_str(), mode);
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if (FD < 0) {
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MakeErrMsg(ErrMsg, "can't open file '" + path_.toString() + "'");
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return true;
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}
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const FileStatus *Status = path_.getFileStatus(false, ErrMsg);
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if (!Status) {
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::close(FD);
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return true;
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}
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info_ = new MappedFileInfo;
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info_->FD = FD;
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info_->Size = Status->getSize();
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return false;
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}
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void MappedFile::terminate() {
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assert(info_ && "MappedFile not initialized");
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::close(info_->FD);
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delete info_;
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info_ = 0;
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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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if (options_ & WRITE_ACCESS)
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::msync(base_, info_->Size, MS_SYNC);
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::munmap(base_, info_->Size);
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base_ = 0; // Mark this as non-mapped.
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}
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}
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void* MappedFile::map(std::string* ErrMsg) {
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assert(info_ && "MappedFile not initialized");
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if (!isMapped()) {
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int prot = PROT_NONE;
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int flags = 0;
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#ifdef MAP_FILE
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flags |= MAP_FILE;
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#endif
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if (options_ == 0) {
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prot = PROT_READ;
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flags = MAP_PRIVATE;
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} else {
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if (options_ & READ_ACCESS)
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prot |= PROT_READ;
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if (options_ & WRITE_ACCESS)
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prot |= PROT_WRITE;
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if (options_ & EXEC_ACCESS)
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prot |= PROT_EXEC;
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if (options_ & SHARED_MAPPING)
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flags |= MAP_SHARED;
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else
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flags |= MAP_PRIVATE;
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}
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size_t map_size = ((info_->Size / Process::GetPageSize())+1) *
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Process::GetPageSize();
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base_ = ::mmap(0, map_size, prot, flags, info_->FD, 0);
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if (base_ == MAP_FAILED) {
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MakeErrMsg(ErrMsg, "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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this->unmap();
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// Adjust the current size to a page boundary
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size_t cur_size = ((info_->Size / Process::GetPageSize())+1) *
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Process::GetPageSize();
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// Adjust the new_size to a page boundary
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new_size = ((new_size / Process::GetPageSize())+1) *
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Process::GetPageSize();
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// If the file needs to be extended
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if (new_size > cur_size) {
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// Ensure we can allocate at least the idodes necessary to handle the
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// file size requested.
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if ((off_t)-1 == ::lseek(info_->FD, new_size, SEEK_SET))
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return MakeErrMsg(ErrMsg, "Can't lseek: ");
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if (-1 == ::write(info_->FD, "\0", 1))
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return MakeErrMsg(ErrMsg, "Can't write: ");
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}
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// Put the mapping back into memory.
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return this->map(ErrMsg);
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}
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}
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