50bc1ed290
This patch modifies how we open File instances in LLDB. Rather than passing a path or FileSpec to the constructor, we now go through the virtual file system. This is needed in order to make things work with the VFS in the future. Differential revision: https://reviews.llvm.org/D54020 llvm-svn: 346049
114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
//===-- FileCache.cpp -------------------------------------------*- 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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#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() == false)
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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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