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//===-- FileSystem.cpp ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/FileSystem.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/Utility/TildeExpressionResolver.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Threading.h"
#include <algorithm>
#include <fstream>
#include <vector>
using namespace lldb;
using namespace lldb_private;
using namespace llvm;
FileSystem &FileSystem::Instance() { return *InstanceImpl(); }
void FileSystem::Initialize() {
lldbassert(!InstanceImpl() && "Already initialized.");
InstanceImpl().emplace();
}
void FileSystem::Initialize(IntrusiveRefCntPtr<vfs::FileSystem> fs) {
lldbassert(!InstanceImpl() && "Already initialized.");
InstanceImpl().emplace(fs);
}
void FileSystem::Terminate() {
lldbassert(InstanceImpl() && "Already terminated.");
InstanceImpl().reset();
}
Optional<FileSystem> &FileSystem::InstanceImpl() {
static Optional<FileSystem> g_fs;
return g_fs;
}
void FileSystem::SetFileSystem(IntrusiveRefCntPtr<vfs::FileSystem> fs) {
m_fs = fs;
}
sys::TimePoint<>
FileSystem::GetModificationTime(const FileSpec &file_spec) const {
return GetModificationTime(file_spec.GetPath());
}
sys::TimePoint<> FileSystem::GetModificationTime(const Twine &path) const {
ErrorOr<vfs::Status> status = m_fs->status(path);
if (!status)
return sys::TimePoint<>();
return status->getLastModificationTime();
}
uint64_t FileSystem::GetByteSize(const FileSpec &file_spec) const {
return GetByteSize(file_spec.GetPath());
}
uint64_t FileSystem::GetByteSize(const Twine &path) const {
ErrorOr<vfs::Status> status = m_fs->status(path);
if (!status)
return 0;
return status->getSize();
}
uint32_t FileSystem::GetPermissions(const FileSpec &file_spec) const {
return GetPermissions(file_spec.GetPath());
}
uint32_t FileSystem::GetPermissions(const Twine &path) const {
ErrorOr<vfs::Status> status = m_fs->status(path);
if (!status)
return sys::fs::perms::perms_not_known;
return status->getPermissions();
}
bool FileSystem::Exists(const Twine &path) const { return m_fs->exists(path); }
bool FileSystem::Exists(const FileSpec &file_spec) const {
return Exists(file_spec.GetPath());
}
bool FileSystem::Readable(const Twine &path) const {
return GetPermissions(path) & sys::fs::perms::all_read;
}
bool FileSystem::Readable(const FileSpec &file_spec) const {
return Readable(file_spec.GetPath());
}
void FileSystem::EnumerateDirectory(Twine path, bool find_directories,
bool find_files, bool find_other,
EnumerateDirectoryCallbackType callback,
void *callback_baton) {
std::error_code EC;
vfs::recursive_directory_iterator Iter(*m_fs, path, EC);
vfs::recursive_directory_iterator End;
for (; Iter != End && !EC; Iter.increment(EC)) {
const auto &Item = *Iter;
ErrorOr<vfs::Status> Status = m_fs->status(Item.path());
if (!Status)
break;
if (!find_files && Status->isRegularFile())
continue;
if (!find_directories && Status->isDirectory())
continue;
if (!find_other && Status->isOther())
continue;
auto Result = callback(callback_baton, Status->getType(), Item.path());
if (Result == eEnumerateDirectoryResultQuit)
return;
if (Result == eEnumerateDirectoryResultNext) {
// Default behavior is to recurse. Opt out if the callback doesn't want
// this behavior.
Iter.no_push();
}
}
}
std::error_code FileSystem::MakeAbsolute(SmallVectorImpl<char> &path) const {
return m_fs->makeAbsolute(path);
}
std::error_code FileSystem::MakeAbsolute(FileSpec &file_spec) const {
SmallString<128> path;
file_spec.GetPath(path, false);
auto EC = MakeAbsolute(path);
if (EC)
return EC;
FileSpec new_file_spec(path, false, file_spec.GetPathStyle());
file_spec = new_file_spec;
return {};
}
std::error_code FileSystem::GetRealPath(const Twine &path,
SmallVectorImpl<char> &output) const {
return m_fs->getRealPath(path, output);
}
void FileSystem::Resolve(SmallVectorImpl<char> &path) {
if (path.empty())
return;
// Resolve tilde.
SmallString<128> original_path(path.begin(), path.end());
StandardTildeExpressionResolver Resolver;
Resolver.ResolveFullPath(original_path, path);
// Try making the path absolute if it exists.
SmallString<128> absolute_path(path.begin(), path.end());
MakeAbsolute(path);
if (!Exists(path)) {
path.clear();
path.append(original_path.begin(), original_path.end());
}
}
void FileSystem::Resolve(FileSpec &file_spec) {
// Extract path from the FileSpec.
SmallString<128> path;
file_spec.GetPath(path);
// Resolve the path.
Resolve(path);
// Update the FileSpec with the resolved path.
file_spec.SetPath(path);
}
bool FileSystem::ResolveExecutableLocation(FileSpec &file_spec) {
// If the directory is set there's nothing to do.
const ConstString &directory = file_spec.GetDirectory();
if (directory)
return false;
// We cannot look for a file if there's no file name.
const ConstString &filename = file_spec.GetFilename();
if (!filename)
return false;
// Search for the file on the host.
const std::string filename_str(filename.GetCString());
llvm::ErrorOr<std::string> error_or_path =
llvm::sys::findProgramByName(filename_str);
if (!error_or_path)
return false;
// findProgramByName returns "." if it can't find the file.
llvm::StringRef path = *error_or_path;
llvm::StringRef parent = llvm::sys::path::parent_path(path);
if (parent.empty() || parent == ".")
return false;
// Make sure that the result exists.
FileSpec result(*error_or_path, false);
if (!Exists(result))
return false;
file_spec = result;
return true;
}
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