WebSVN – QNX 8.QNX8 LLVM/Clang compiler suite – Blame – //llvm-build/x86_64/include/llvm/Support/FileUtilities.h

Rev	Author	Line No.	Line
14	pmbaty	1	//===- llvm/Support/FileUtilities.h - File System Utilities ------ C++ --===//
		2	//
		3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
		4	// See https://llvm.org/LICENSE.txt for license information.
		5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
		6	//
		7	//===----------------------------------------------------------------------===//
		8	//
		9	// This file defines a family of utility functions which are useful for doing
		10	// various things with files.
		11	//
		12	//===----------------------------------------------------------------------===//
		13
		14	#ifndef LLVM_SUPPORT_FILEUTILITIES_H
		15	#define LLVM_SUPPORT_FILEUTILITIES_H
		16
		17	#include "llvm/ADT/StringRef.h"
		18	#include "llvm/Support/Error.h"
		19	#include "llvm/Support/FileSystem.h"
		20
		21	#include <system_error>
		22
		23	namespace llvm {
		24
		25	/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if
		26	/// the files match, 1 if they are different, and 2 if there is a file error.
		27	/// This function allows you to specify an absolute and relative FP error that
		28	/// is allowed to exist. If you specify a string to fill in for the error
		29	/// option, it will set the string to an error message if an error occurs, or
		30	/// if the files are different.
		31	///
		32	int DiffFilesWithTolerance(StringRef FileA,
		33	StringRef FileB,
		34	double AbsTol, double RelTol,
		35	std::string *Error = nullptr);
		36
		37
		38	/// FileRemover - This class is a simple object meant to be stack allocated.
		39	/// If an exception is thrown from a region, the object removes the filename
		40	/// specified (if deleteIt is true).
		41	///
		42	class FileRemover {
		43	SmallString<128> Filename;
		44	bool DeleteIt;
		45	public:
		46	FileRemover() : DeleteIt(false) {}
		47
		48	explicit FileRemover(const Twine& filename, bool deleteIt = true)
		49	: DeleteIt(deleteIt) {
		50	filename.toVector(Filename);
		51	}
		52
		53	~FileRemover() {
		54	if (DeleteIt) {
		55	// Ignore problems deleting the file.
		56	sys::fs::remove(Filename);
		57	}
		58	}
		59
		60	/// setFile - Give ownership of the file to the FileRemover so it will
		61	/// be removed when the object is destroyed. If the FileRemover already
		62	/// had ownership of a file, remove it first.
		63	void setFile(const Twine& filename, bool deleteIt = true) {
		64	if (DeleteIt) {
		65	// Ignore problems deleting the file.
		66	sys::fs::remove(Filename);
		67	}
		68
		69	Filename.clear();
		70	filename.toVector(Filename);
		71	DeleteIt = deleteIt;
		72	}
		73
		74	/// releaseFile - Take ownership of the file away from the FileRemover so it
		75	/// will not be removed when the object is destroyed.
		76	void releaseFile() { DeleteIt = false; }
		77	};
		78
		79	enum class atomic_write_error {
		80	failed_to_create_uniq_file = 0,
		81	output_stream_error,
		82	failed_to_rename_temp_file
		83	};
		84
		85	class AtomicFileWriteError : public llvm::ErrorInfo<AtomicFileWriteError> {
		86	public:
		87	AtomicFileWriteError(atomic_write_error Error) : Error(Error) {}
		88
		89	void log(raw_ostream &OS) const override;
		90
		91	const atomic_write_error Error;
		92	static char ID;
		93
		94	private:
		95	// Users are not expected to use error_code.
		96	std::error_code convertToErrorCode() const override {
		97	return llvm::inconvertibleErrorCode();
		98	}
		99	};
		100
		101	// atomic_write_error + whatever the Writer can return
		102
		103	/// Creates a unique file with name according to the given \p TempPathModel,
		104	/// writes content of \p Buffer to the file and renames it to \p FinalPath.
		105	///
		106	/// \returns \c AtomicFileWriteError in case of error.
		107	llvm::Error writeFileAtomically(StringRef TempPathModel, StringRef FinalPath,
		108	StringRef Buffer);
		109
		110	llvm::Error
		111	writeFileAtomically(StringRef TempPathModel, StringRef FinalPath,
		112	std::function<llvm::Error(llvm::raw_ostream &)> Writer);
		113
		114	/// FilePermssionsApplier helps to copy permissions from an input file to
		115	/// an output one. It memorizes the status of the input file and can apply
		116	/// permissions and dates to the output file.
		117	class FilePermissionsApplier {
		118	public:
		119	static Expected<FilePermissionsApplier> create(StringRef InputFilename);
		120
		121	/// Apply stored permissions to the \p OutputFilename.
		122	/// Copy LastAccess and ModificationTime if \p CopyDates is true.
		123	/// Overwrite stored permissions if \p OverwritePermissions is specified.
		124	Error
		125	apply(StringRef OutputFilename, bool CopyDates = false,
		126	std::optional<sys::fs::perms> OverwritePermissions = std::nullopt);
		127
		128	private:
		129	FilePermissionsApplier(StringRef InputFilename, sys::fs::file_status Status)
		130	: InputFilename(InputFilename), InputStatus(Status) {}
		131
		132	StringRef InputFilename;
		133	sys::fs::file_status InputStatus;
		134	};
		135	} // End llvm namespace
		136
		137	#endif

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QNX 8.QNX8 LLVM/Clang compiler suite//llvm-build/x86_64/include/llvm/Support/FileUtilities.h – Rev 14