2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
//===-- FileCache.cpp -------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/FileCache.h"
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#include "lldb/Host/File.h"
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#include "lldb/Host/FileSystem.h"
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using namespace lldb;
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using namespace lldb_private;
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FileCache *FileCache::m_instance = nullptr;
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FileCache &FileCache::GetInstance() {
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if (m_instance == nullptr)
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m_instance = new FileCache();
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return *m_instance;
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}
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lldb::user_id_t FileCache::OpenFile(const FileSpec &file_spec, uint32_t flags,
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uint32_t mode, Status &error) {
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if (!file_spec) {
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error.SetErrorString("empty path");
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return UINT64_MAX;
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}
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FileSP file_sp(new File());
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error = FileSystem::Instance().Open(*file_sp, file_spec, flags, mode);
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if (!file_sp->IsValid())
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return UINT64_MAX;
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lldb::user_id_t fd = file_sp->GetDescriptor();
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m_cache[fd] = file_sp;
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return fd;
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}
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bool FileCache::CloseFile(lldb::user_id_t fd, Status &error) {
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if (fd == UINT64_MAX) {
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error.SetErrorString("invalid file descriptor");
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return false;
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}
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FDToFileMap::iterator pos = m_cache.find(fd);
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if (pos == m_cache.end()) {
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error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
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return false;
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}
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FileSP file_sp = pos->second;
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if (!file_sp) {
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error.SetErrorString("invalid host backing file");
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return false;
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}
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error = file_sp->Close();
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m_cache.erase(pos);
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return error.Success();
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}
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uint64_t FileCache::WriteFile(lldb::user_id_t fd, uint64_t offset,
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const void *src, uint64_t src_len,
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Status &error) {
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if (fd == UINT64_MAX) {
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error.SetErrorString("invalid file descriptor");
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return UINT64_MAX;
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}
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FDToFileMap::iterator pos = m_cache.find(fd);
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if (pos == m_cache.end()) {
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error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
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return false;
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}
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FileSP file_sp = pos->second;
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if (!file_sp) {
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error.SetErrorString("invalid host backing file");
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return UINT64_MAX;
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}
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if (static_cast<uint64_t>(file_sp->SeekFromStart(offset, &error)) != offset ||
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error.Fail())
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return UINT64_MAX;
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size_t bytes_written = src_len;
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error = file_sp->Write(src, bytes_written);
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if (error.Fail())
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return UINT64_MAX;
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return bytes_written;
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}
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uint64_t FileCache::ReadFile(lldb::user_id_t fd, uint64_t offset, void *dst,
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uint64_t dst_len, Status &error) {
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if (fd == UINT64_MAX) {
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error.SetErrorString("invalid file descriptor");
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return UINT64_MAX;
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}
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FDToFileMap::iterator pos = m_cache.find(fd);
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if (pos == m_cache.end()) {
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error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
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return false;
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}
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FileSP file_sp = pos->second;
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if (!file_sp) {
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error.SetErrorString("invalid host backing file");
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return UINT64_MAX;
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}
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if (static_cast<uint64_t>(file_sp->SeekFromStart(offset, &error)) != offset ||
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error.Fail())
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return UINT64_MAX;
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size_t bytes_read = dst_len;
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error = file_sp->Read(dst, bytes_read);
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if (error.Fail())
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return UINT64_MAX;
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return bytes_read;
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}
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