2fce1137c7
Summary: This patch converts FileSystem::Open from this prototype: Status Open(File &File, const FileSpec &file_spec, ...); to this one: llvm::Expected<std::unique_ptr<File>> Open(const FileSpec &file_spec, ...); This is beneficial on its own, as llvm::Expected is a more modern and recommended error type than Status. It is also a necessary step towards https://reviews.llvm.org/D67891, and further developments for lldb_private::File. Reviewers: JDevlieghere, jasonmolenda, labath Reviewed By: labath Subscribers: mgorny, lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D67996 llvm-svn: 373003
114 lines
3.3 KiB
C++
114 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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auto file = FileSystem::Instance().Open(file_spec, flags, mode);
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if (!file) {
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error = file.takeError();
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return UINT64_MAX;
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}
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lldb::user_id_t fd = file.get()->GetDescriptor();
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m_cache[fd] = std::move(file.get());
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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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FileUP &file_up = pos->second;
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if (!file_up) {
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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_up->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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FileUP &file_up = pos->second;
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if (!file_up) {
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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_up->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_up->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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FileUP &file_up = pos->second;
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if (!file_up) {
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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_up->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_up->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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