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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186561 91177308-0d34-0410-b5e6-96231b3b80d8
989 lines
34 KiB
C++
989 lines
34 KiB
C++
//===- llvm/Support/FileSystem.h - File System OS Concept -------*- 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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//
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// This file declares the llvm::sys::fs namespace. It is designed after
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// TR2/boost filesystem (v3), but modified to remove exception handling and the
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// path class.
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//
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// All functions return an error_code and their actual work via the last out
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// argument. The out argument is defined if and only if errc::success is
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// returned. A function may return any error code in the generic or system
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// category. However, they shall be equivalent to any error conditions listed
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// in each functions respective documentation if the condition applies. [ note:
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// this does not guarantee that error_code will be in the set of explicitly
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// listed codes, but it does guarantee that if any of the explicitly listed
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// errors occur, the correct error_code will be used ]. All functions may
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// return errc::not_enough_memory if there is not enough memory to complete the
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// operation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_FILESYSTEM_H
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#define LLVM_SUPPORT_FILESYSTEM_H
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/TimeValue.h"
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#include "llvm/Support/system_error.h"
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#include <ctime>
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#include <iterator>
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#include <stack>
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#include <string>
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#include <vector>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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namespace llvm {
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namespace sys {
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namespace fs {
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/// file_type - An "enum class" enumeration for the file system's view of the
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/// type.
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struct file_type {
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enum _ {
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status_error,
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file_not_found,
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regular_file,
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directory_file,
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symlink_file,
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block_file,
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character_file,
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fifo_file,
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socket_file,
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type_unknown
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};
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file_type(_ v) : v_(v) {}
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explicit file_type(int v) : v_(_(v)) {}
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operator int() const {return v_;}
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private:
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int v_;
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};
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/// space_info - Self explanatory.
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struct space_info {
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uint64_t capacity;
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uint64_t free;
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uint64_t available;
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};
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enum perms {
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no_perms = 0,
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owner_read = 0400,
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owner_write = 0200,
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owner_exe = 0100,
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owner_all = owner_read | owner_write | owner_exe,
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group_read = 040,
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group_write = 020,
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group_exe = 010,
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group_all = group_read | group_write | group_exe,
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others_read = 04,
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others_write = 02,
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others_exe = 01,
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others_all = others_read | others_write | others_exe,
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all_read = owner_read | group_read | others_read,
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all_write = owner_write | group_write | others_write,
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all_exe = owner_exe | group_exe | others_exe,
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all_all = owner_all | group_all | others_all,
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set_uid_on_exe = 04000,
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set_gid_on_exe = 02000,
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sticky_bit = 01000,
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perms_not_known = 0xFFFF
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};
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// Helper functions so that you can use & and | to manipulate perms bits:
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inline perms operator|(perms l , perms r) {
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return static_cast<perms>(
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static_cast<unsigned short>(l) | static_cast<unsigned short>(r));
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}
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inline perms operator&(perms l , perms r) {
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return static_cast<perms>(
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static_cast<unsigned short>(l) & static_cast<unsigned short>(r));
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}
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inline perms &operator|=(perms &l, perms r) {
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l = l | r;
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return l;
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}
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inline perms &operator&=(perms &l, perms r) {
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l = l & r;
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return l;
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}
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inline perms operator~(perms x) {
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return static_cast<perms>(~static_cast<unsigned short>(x));
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}
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/// file_status - Represents the result of a call to stat and friends. It has
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/// a platform specific member to store the result.
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class file_status
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{
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#if defined(LLVM_ON_UNIX)
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dev_t fs_st_dev;
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ino_t fs_st_ino;
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time_t fs_st_mtime;
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uid_t fs_st_uid;
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gid_t fs_st_gid;
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off_t fs_st_size;
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#elif defined (LLVM_ON_WIN32)
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uint32_t LastWriteTimeHigh;
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uint32_t LastWriteTimeLow;
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uint32_t VolumeSerialNumber;
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uint32_t FileSizeHigh;
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uint32_t FileSizeLow;
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uint32_t FileIndexHigh;
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uint32_t FileIndexLow;
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#endif
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friend bool equivalent(file_status A, file_status B);
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friend error_code getUniqueID(const Twine Path, uint64_t &Result);
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file_type Type;
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perms Perms;
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public:
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file_status() : Type(file_type::status_error) {}
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file_status(file_type Type) : Type(Type) {}
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#if defined(LLVM_ON_UNIX)
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file_status(file_type Type, perms Perms, dev_t Dev, ino_t Ino, time_t MTime,
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uid_t UID, gid_t GID, off_t Size)
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: fs_st_dev(Dev), fs_st_ino(Ino), fs_st_mtime(MTime), fs_st_uid(UID),
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fs_st_gid(GID), fs_st_size(Size), Type(Type), Perms(Perms) {}
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#elif defined(LLVM_ON_WIN32)
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file_status(file_type Type, uint32_t LastWriteTimeHigh,
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uint32_t LastWriteTimeLow, uint32_t VolumeSerialNumber,
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uint32_t FileSizeHigh, uint32_t FileSizeLow,
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uint32_t FileIndexHigh, uint32_t FileIndexLow)
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: LastWriteTimeHigh(LastWriteTimeHigh),
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LastWriteTimeLow(LastWriteTimeLow),
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VolumeSerialNumber(VolumeSerialNumber), FileSizeHigh(FileSizeHigh),
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FileSizeLow(FileSizeLow), FileIndexHigh(FileIndexHigh),
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FileIndexLow(FileIndexLow), Type(Type), Perms(perms_not_known) {}
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#endif
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// getters
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file_type type() const { return Type; }
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perms permissions() const { return Perms; }
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TimeValue getLastModificationTime() const;
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#if defined(LLVM_ON_UNIX)
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uint32_t getUser() const { return fs_st_uid; }
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uint32_t getGroup() const { return fs_st_gid; }
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uint64_t getSize() const { return fs_st_size; }
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#elif defined (LLVM_ON_WIN32)
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uint32_t getUser() const {
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return 9999; // Not applicable to Windows, so...
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}
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uint32_t getGroup() const {
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return 9999; // Not applicable to Windows, so...
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}
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uint64_t getSize() const {
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return (uint64_t(FileSizeHigh) << 32) + FileSizeLow;
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}
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#endif
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// setters
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void type(file_type v) { Type = v; }
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void permissions(perms p) { Perms = p; }
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};
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/// file_magic - An "enum class" enumeration of file types based on magic (the first
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/// N bytes of the file).
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struct file_magic {
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enum Impl {
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unknown = 0, ///< Unrecognized file
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bitcode, ///< Bitcode file
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archive, ///< ar style archive file
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elf_relocatable, ///< ELF Relocatable object file
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elf_executable, ///< ELF Executable image
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elf_shared_object, ///< ELF dynamically linked shared lib
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elf_core, ///< ELF core image
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macho_object, ///< Mach-O Object file
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macho_executable, ///< Mach-O Executable
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macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM
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macho_core, ///< Mach-O Core File
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macho_preload_executable, ///< Mach-O Preloaded Executable
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macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib
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macho_dynamic_linker, ///< The Mach-O dynamic linker
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macho_bundle, ///< Mach-O Bundle file
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macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub
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macho_dsym_companion, ///< Mach-O dSYM companion file
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macho_universal_binary, ///< Mach-O universal binary
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coff_object, ///< COFF object file
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pecoff_executable ///< PECOFF executable file
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};
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bool is_object() const {
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return V == unknown ? false : true;
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}
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file_magic() : V(unknown) {}
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file_magic(Impl V) : V(V) {}
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operator Impl() const { return V; }
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private:
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Impl V;
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};
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/// @}
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/// @name Physical Operators
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/// @{
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/// @brief Make \a path an absolute path.
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///
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/// Makes \a path absolute using the current directory if it is not already. An
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/// empty \a path will result in the current directory.
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///
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/// /absolute/path => /absolute/path
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/// relative/../path => <current-directory>/relative/../path
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///
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/// @param path A path that is modified to be an absolute path.
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/// @returns errc::success if \a path has been made absolute, otherwise a
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/// platform specific error_code.
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error_code make_absolute(SmallVectorImpl<char> &path);
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/// @brief Create all the non-existent directories in path.
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///
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/// @param path Directories to create.
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/// @param existed Set to true if \a path already existed, false otherwise.
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/// @returns errc::success if is_directory(path) and existed have been set,
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/// otherwise a platform specific error_code.
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error_code create_directories(const Twine &path, bool &existed);
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/// @brief Convenience function for clients that don't need to know if the
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/// directory existed or not.
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inline error_code create_directories(const Twine &Path) {
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bool Existed;
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return create_directories(Path, Existed);
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}
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/// @brief Create the directory in path.
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///
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/// @param path Directory to create.
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/// @param existed Set to true if \a path already existed, false otherwise.
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/// @returns errc::success if is_directory(path) and existed have been set,
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/// otherwise a platform specific error_code.
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error_code create_directory(const Twine &path, bool &existed);
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/// @brief Convenience function for clients that don't need to know if the
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/// directory existed or not.
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inline error_code create_directory(const Twine &Path) {
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bool Existed;
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return create_directory(Path, Existed);
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}
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/// @brief Create a hard link from \a from to \a to.
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///
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/// @param to The path to hard link to.
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/// @param from The path to hard link from. This is created.
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/// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
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/// , otherwise a platform specific error_code.
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error_code create_hard_link(const Twine &to, const Twine &from);
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/// @brief Create a symbolic link from \a from to \a to.
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///
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/// @param to The path to symbolically link to.
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/// @param from The path to symbolically link from. This is created.
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/// @returns errc::success if exists(to) && exists(from) && is_symlink(from),
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/// otherwise a platform specific error_code.
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error_code create_symlink(const Twine &to, const Twine &from);
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/// @brief Get the current path.
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///
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/// @param result Holds the current path on return.
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/// @returns errc::success if the current path has been stored in result,
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/// otherwise a platform specific error_code.
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error_code current_path(SmallVectorImpl<char> &result);
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/// @brief Remove path. Equivalent to POSIX remove().
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///
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/// @param path Input path.
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/// @param existed Set to true if \a path existed, false if it did not.
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/// undefined otherwise.
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/// @returns errc::success if path has been removed and existed has been
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/// successfully set, otherwise a platform specific error_code.
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error_code remove(const Twine &path, bool &existed);
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/// @brief Convenience function for clients that don't need to know if the file
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/// existed or not.
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inline error_code remove(const Twine &Path) {
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bool Existed;
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return remove(Path, Existed);
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}
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/// @brief Recursively remove all files below \a path, then \a path. Files are
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/// removed as if by POSIX remove().
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///
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/// @param path Input path.
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/// @param num_removed Number of files removed.
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/// @returns errc::success if path has been removed and num_removed has been
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/// successfully set, otherwise a platform specific error_code.
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error_code remove_all(const Twine &path, uint32_t &num_removed);
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/// @brief Convenience function for clients that don't need to know how many
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/// files were removed.
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inline error_code remove_all(const Twine &Path) {
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uint32_t Removed;
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return remove_all(Path, Removed);
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}
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/// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
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///
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/// @param from The path to rename from.
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/// @param to The path to rename to. This is created.
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error_code rename(const Twine &from, const Twine &to);
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/// @brief Resize path to size. File is resized as if by POSIX truncate().
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///
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/// @param path Input path.
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/// @param size Size to resize to.
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/// @returns errc::success if \a path has been resized to \a size, otherwise a
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/// platform specific error_code.
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error_code resize_file(const Twine &path, uint64_t size);
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/// @}
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/// @name Physical Observers
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/// @{
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/// @brief Does file exist?
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///
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/// @param status A file_status previously returned from stat.
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/// @returns True if the file represented by status exists, false if it does
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/// not.
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bool exists(file_status status);
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/// @brief Does file exist?
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///
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/// @param path Input path.
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/// @param result Set to true if the file represented by status exists, false if
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/// it does not. Undefined otherwise.
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/// @returns errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code exists(const Twine &path, bool &result);
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/// @brief Simpler version of exists for clients that don't need to
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/// differentiate between an error and false.
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inline bool exists(const Twine &path) {
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bool result;
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return !exists(path, result) && result;
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}
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/// @brief Can we execute this file?
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///
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/// @param Path Input path.
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/// @returns True if we can execute it, false otherwise.
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bool can_execute(const Twine &Path);
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/// @brief Can we write this file?
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///
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/// @param Path Input path.
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/// @returns True if we can write to it, false otherwise.
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bool can_write(const Twine &Path);
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/// @brief Do file_status's represent the same thing?
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///
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/// @param A Input file_status.
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/// @param B Input file_status.
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///
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/// assert(status_known(A) || status_known(B));
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///
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/// @returns True if A and B both represent the same file system entity, false
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/// otherwise.
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bool equivalent(file_status A, file_status B);
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/// @brief Do paths represent the same thing?
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///
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/// assert(status_known(A) || status_known(B));
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///
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/// @param A Input path A.
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/// @param B Input path B.
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/// @param result Set to true if stat(A) and stat(B) have the same device and
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/// inode (or equivalent).
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/// @returns errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code equivalent(const Twine &A, const Twine &B, bool &result);
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/// @brief Simpler version of equivalent for clients that don't need to
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/// differentiate between an error and false.
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inline bool equivalent(const Twine &A, const Twine &B) {
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bool result;
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return !equivalent(A, B, result) && result;
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}
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/// @brief Does status represent a directory?
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///
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/// @param status A file_status previously returned from status.
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/// @returns status.type() == file_type::directory_file.
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bool is_directory(file_status status);
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/// @brief Is path a directory?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path is a directory, false if it is not.
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/// Undefined otherwise.
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/// @returns errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_directory(const Twine &path, bool &result);
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/// @brief Simpler version of is_directory for clients that don't need to
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/// differentiate between an error and false.
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inline bool is_directory(const Twine &Path) {
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bool Result;
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return !is_directory(Path, Result) && Result;
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}
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/// @brief Does status represent a regular file?
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///
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/// @param status A file_status previously returned from status.
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/// @returns status_known(status) && status.type() == file_type::regular_file.
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bool is_regular_file(file_status status);
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/// @brief Is path a regular file?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path is a regular file, false if it is not.
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/// Undefined otherwise.
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/// @returns errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_regular_file(const Twine &path, bool &result);
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/// @brief Simpler version of is_regular_file for clients that don't need to
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/// differentiate between an error and false.
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inline bool is_regular_file(const Twine &Path) {
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bool Result;
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if (is_regular_file(Path, Result))
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return false;
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return Result;
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}
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/// @brief Does this status represent something that exists but is not a
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/// directory, regular file, or symlink?
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///
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/// @param status A file_status previously returned from status.
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/// @returns exists(s) && !is_regular_file(s) && !is_directory(s) &&
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/// !is_symlink(s)
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bool is_other(file_status status);
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/// @brief Is path something that exists but is not a directory,
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/// regular file, or symlink?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path exists, but is not a directory, regular
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/// file, or a symlink, false if it does not. Undefined otherwise.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code is_other(const Twine &path, bool &result);
|
|
|
|
/// @brief Does status represent a symlink?
|
|
///
|
|
/// @param status A file_status previously returned from stat.
|
|
/// @returns status.type() == symlink_file.
|
|
bool is_symlink(file_status status);
|
|
|
|
/// @brief Is path a symlink?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is a symlink, false if it is not.
|
|
/// Undefined otherwise.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code is_symlink(const Twine &path, bool &result);
|
|
|
|
/// @brief Get file status as if by POSIX stat().
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to the file status.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code status(const Twine &path, file_status &result);
|
|
|
|
/// @brief A version for when a file descriptor is already available.
|
|
error_code status(int FD, file_status &Result);
|
|
|
|
/// @brief Get file size.
|
|
///
|
|
/// @param Path Input path.
|
|
/// @param Result Set to the size of the file in \a Path.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
inline error_code file_size(const Twine &Path, uint64_t &Result) {
|
|
file_status Status;
|
|
error_code EC = status(Path, Status);
|
|
if (EC)
|
|
return EC;
|
|
Result = Status.getSize();
|
|
return error_code::success();
|
|
}
|
|
|
|
error_code setLastModificationAndAccessTime(int FD, TimeValue Time);
|
|
|
|
/// @brief Is status available?
|
|
///
|
|
/// @param s Input file status.
|
|
/// @returns True if status() != status_error.
|
|
bool status_known(file_status s);
|
|
|
|
/// @brief Is status available?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if status() != status_error.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code status_known(const Twine &path, bool &result);
|
|
|
|
/// @brief Create a uniquely named file.
|
|
///
|
|
/// Generates a unique path suitable for a temporary file and then opens it as a
|
|
/// file. The name is based on \a model with '%' replaced by a random char in
|
|
/// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
|
|
/// directory will be prepended.
|
|
///
|
|
/// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s
|
|
///
|
|
/// This is an atomic operation. Either the file is created and opened, or the
|
|
/// file system is left untouched.
|
|
///
|
|
/// The intendend use is for files that are to be kept, possibly after
|
|
/// renaming them. For example, when running 'clang -c foo.o', the file can
|
|
/// be first created as foo-abc123.o and then renamed.
|
|
///
|
|
/// @param Model Name to base unique path off of.
|
|
/// @param ResultFD Set to the opened file's file descriptor.
|
|
/// @param ResultPath Set to the opened file's absolute path.
|
|
/// @returns errc::success if Result{FD,Path} have been successfully set,
|
|
/// otherwise a platform specific error_code.
|
|
error_code createUniqueFile(const Twine &Model, int &ResultFD,
|
|
SmallVectorImpl<char> &ResultPath,
|
|
unsigned Mode = all_read | all_write);
|
|
|
|
/// @brief Simpler version for clients that don't want an open file.
|
|
error_code createUniqueFile(const Twine &Model,
|
|
SmallVectorImpl<char> &ResultPath);
|
|
|
|
/// @brief Create a file in the system temporary directory.
|
|
///
|
|
/// The filename is of the form prefix-random_chars.suffix. Since the directory
|
|
/// is not know to the caller, Prefix and Suffix cannot have path separators.
|
|
/// The files are created with mode 0600.
|
|
///
|
|
/// This should be used for things like a temporary .s that is removed after
|
|
/// running the assembler.
|
|
error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
|
|
int &ResultFD,
|
|
SmallVectorImpl<char> &ResultPath);
|
|
|
|
/// @brief Simpler version for clients that don't want an open file.
|
|
error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
|
|
SmallVectorImpl<char> &ResultPath);
|
|
|
|
error_code createUniqueDirectory(const Twine &Prefix,
|
|
SmallVectorImpl<char> &ResultPath);
|
|
|
|
enum OpenFlags {
|
|
F_None = 0,
|
|
|
|
/// F_Excl - When opening a file, this flag makes raw_fd_ostream
|
|
/// report an error if the file already exists.
|
|
F_Excl = 1,
|
|
|
|
/// F_Append - When opening a file, if it already exists append to the
|
|
/// existing file instead of returning an error. This may not be specified
|
|
/// with F_Excl.
|
|
F_Append = 2,
|
|
|
|
/// F_Binary - The file should be opened in binary mode on platforms that
|
|
/// make this distinction.
|
|
F_Binary = 4
|
|
};
|
|
|
|
inline OpenFlags operator|(OpenFlags A, OpenFlags B) {
|
|
return OpenFlags(unsigned(A) | unsigned(B));
|
|
}
|
|
|
|
inline OpenFlags &operator|=(OpenFlags &A, OpenFlags B) {
|
|
A = A | B;
|
|
return A;
|
|
}
|
|
|
|
error_code openFileForWrite(const Twine &Name, int &ResultFD, OpenFlags Flags,
|
|
unsigned Mode = 0666);
|
|
|
|
error_code openFileForRead(const Twine &Name, int &ResultFD);
|
|
|
|
/// @brief Canonicalize path.
|
|
///
|
|
/// Sets result to the file system's idea of what path is. The result is always
|
|
/// absolute and has the same capitalization as the file system.
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to the canonicalized version of \a path.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result);
|
|
|
|
/// @brief Are \a path's first bytes \a magic?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code has_magic(const Twine &path, const Twine &magic, bool &result);
|
|
|
|
/// @brief Get \a path's first \a len bytes.
|
|
///
|
|
/// @param path Input path.
|
|
/// @param len Number of magic bytes to get.
|
|
/// @param result Set to the first \a len bytes in the file pointed to by
|
|
/// \a path. Or the entire file if file_size(path) < len, in which
|
|
/// case result.size() returns the size of the file.
|
|
/// @returns errc::success if result has been successfully set,
|
|
/// errc::value_too_large if len is larger then the file pointed to by
|
|
/// \a path, otherwise a platform specific error_code.
|
|
error_code get_magic(const Twine &path, uint32_t len,
|
|
SmallVectorImpl<char> &result);
|
|
|
|
/// @brief Identify the type of a binary file based on how magical it is.
|
|
file_magic identify_magic(StringRef magic);
|
|
|
|
/// @brief Get and identify \a path's type based on its content.
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to the type of file, or file_magic::unknown.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code identify_magic(const Twine &path, file_magic &result);
|
|
|
|
error_code getUniqueID(const Twine Path, uint64_t &Result);
|
|
|
|
/// This class represents a memory mapped file. It is based on
|
|
/// boost::iostreams::mapped_file.
|
|
class mapped_file_region {
|
|
mapped_file_region() LLVM_DELETED_FUNCTION;
|
|
mapped_file_region(mapped_file_region&) LLVM_DELETED_FUNCTION;
|
|
mapped_file_region &operator =(mapped_file_region&) LLVM_DELETED_FUNCTION;
|
|
|
|
public:
|
|
enum mapmode {
|
|
readonly, ///< May only access map via const_data as read only.
|
|
readwrite, ///< May access map via data and modify it. Written to path.
|
|
priv ///< May modify via data, but changes are lost on destruction.
|
|
};
|
|
|
|
private:
|
|
/// Platform specific mapping state.
|
|
mapmode Mode;
|
|
uint64_t Size;
|
|
void *Mapping;
|
|
#ifdef LLVM_ON_WIN32
|
|
int FileDescriptor;
|
|
void *FileHandle;
|
|
void *FileMappingHandle;
|
|
#endif
|
|
|
|
error_code init(int FD, bool CloseFD, uint64_t Offset);
|
|
|
|
public:
|
|
typedef char char_type;
|
|
|
|
#if LLVM_HAS_RVALUE_REFERENCES
|
|
mapped_file_region(mapped_file_region&&);
|
|
mapped_file_region &operator =(mapped_file_region&&);
|
|
#endif
|
|
|
|
/// Construct a mapped_file_region at \a path starting at \a offset of length
|
|
/// \a length and with access \a mode.
|
|
///
|
|
/// \param path Path to the file to map. If it does not exist it will be
|
|
/// created.
|
|
/// \param mode How to map the memory.
|
|
/// \param length Number of bytes to map in starting at \a offset. If the file
|
|
/// is shorter than this, it will be extended. If \a length is
|
|
/// 0, the entire file will be mapped.
|
|
/// \param offset Byte offset from the beginning of the file where the map
|
|
/// should begin. Must be a multiple of
|
|
/// mapped_file_region::alignment().
|
|
/// \param ec This is set to errc::success if the map was constructed
|
|
/// sucessfully. Otherwise it is set to a platform dependent error.
|
|
mapped_file_region(const Twine &path,
|
|
mapmode mode,
|
|
uint64_t length,
|
|
uint64_t offset,
|
|
error_code &ec);
|
|
|
|
/// \param fd An open file descriptor to map. mapped_file_region takes
|
|
/// ownership if closefd is true. It must have been opended in the correct
|
|
/// mode.
|
|
mapped_file_region(int fd,
|
|
bool closefd,
|
|
mapmode mode,
|
|
uint64_t length,
|
|
uint64_t offset,
|
|
error_code &ec);
|
|
|
|
~mapped_file_region();
|
|
|
|
mapmode flags() const;
|
|
uint64_t size() const;
|
|
char *data() const;
|
|
|
|
/// Get a const view of the data. Modifying this memory has undefined
|
|
/// behavior.
|
|
const char *const_data() const;
|
|
|
|
/// \returns The minimum alignment offset must be.
|
|
static int alignment();
|
|
};
|
|
|
|
/// @brief Memory maps the contents of a file
|
|
///
|
|
/// @param path Path to file to map.
|
|
/// @param file_offset Byte offset in file where mapping should begin.
|
|
/// @param size Byte length of range of the file to map.
|
|
/// @param map_writable If true, the file will be mapped in r/w such
|
|
/// that changes to the mapped buffer will be flushed back
|
|
/// to the file. If false, the file will be mapped read-only
|
|
/// and the buffer will be read-only.
|
|
/// @param result Set to the start address of the mapped buffer.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code map_file_pages(const Twine &path, off_t file_offset, size_t size,
|
|
bool map_writable, void *&result);
|
|
|
|
|
|
/// @brief Memory unmaps the contents of a file
|
|
///
|
|
/// @param base Pointer to the start of the buffer.
|
|
/// @param size Byte length of the range to unmmap.
|
|
/// @returns errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code unmap_file_pages(void *base, size_t size);
|
|
|
|
/// Return the path to the main executable, given the value of argv[0] from
|
|
/// program startup and the address of main itself. In extremis, this function
|
|
/// may fail and return an empty path.
|
|
std::string getMainExecutable(const char *argv0, void *MainExecAddr);
|
|
|
|
/// @}
|
|
/// @name Iterators
|
|
/// @{
|
|
|
|
/// directory_entry - A single entry in a directory. Caches the status either
|
|
/// from the result of the iteration syscall, or the first time status is
|
|
/// called.
|
|
class directory_entry {
|
|
std::string Path;
|
|
mutable file_status Status;
|
|
|
|
public:
|
|
explicit directory_entry(const Twine &path, file_status st = file_status())
|
|
: Path(path.str())
|
|
, Status(st) {}
|
|
|
|
directory_entry() {}
|
|
|
|
void assign(const Twine &path, file_status st = file_status()) {
|
|
Path = path.str();
|
|
Status = st;
|
|
}
|
|
|
|
void replace_filename(const Twine &filename, file_status st = file_status());
|
|
|
|
const std::string &path() const { return Path; }
|
|
error_code status(file_status &result) const;
|
|
|
|
bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
|
|
bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
|
|
bool operator< (const directory_entry& rhs) const;
|
|
bool operator<=(const directory_entry& rhs) const;
|
|
bool operator> (const directory_entry& rhs) const;
|
|
bool operator>=(const directory_entry& rhs) const;
|
|
};
|
|
|
|
namespace detail {
|
|
struct DirIterState;
|
|
|
|
error_code directory_iterator_construct(DirIterState&, StringRef);
|
|
error_code directory_iterator_increment(DirIterState&);
|
|
error_code directory_iterator_destruct(DirIterState&);
|
|
|
|
/// DirIterState - Keeps state for the directory_iterator. It is reference
|
|
/// counted in order to preserve InputIterator semantics on copy.
|
|
struct DirIterState : public RefCountedBase<DirIterState> {
|
|
DirIterState()
|
|
: IterationHandle(0) {}
|
|
|
|
~DirIterState() {
|
|
directory_iterator_destruct(*this);
|
|
}
|
|
|
|
intptr_t IterationHandle;
|
|
directory_entry CurrentEntry;
|
|
};
|
|
}
|
|
|
|
/// directory_iterator - Iterates through the entries in path. There is no
|
|
/// operator++ because we need an error_code. If it's really needed we can make
|
|
/// it call report_fatal_error on error.
|
|
class directory_iterator {
|
|
IntrusiveRefCntPtr<detail::DirIterState> State;
|
|
|
|
public:
|
|
explicit directory_iterator(const Twine &path, error_code &ec) {
|
|
State = new detail::DirIterState;
|
|
SmallString<128> path_storage;
|
|
ec = detail::directory_iterator_construct(*State,
|
|
path.toStringRef(path_storage));
|
|
}
|
|
|
|
explicit directory_iterator(const directory_entry &de, error_code &ec) {
|
|
State = new detail::DirIterState;
|
|
ec = detail::directory_iterator_construct(*State, de.path());
|
|
}
|
|
|
|
/// Construct end iterator.
|
|
directory_iterator() : State(new detail::DirIterState) {}
|
|
|
|
// No operator++ because we need error_code.
|
|
directory_iterator &increment(error_code &ec) {
|
|
ec = directory_iterator_increment(*State);
|
|
return *this;
|
|
}
|
|
|
|
const directory_entry &operator*() const { return State->CurrentEntry; }
|
|
const directory_entry *operator->() const { return &State->CurrentEntry; }
|
|
|
|
bool operator==(const directory_iterator &RHS) const {
|
|
return State->CurrentEntry == RHS.State->CurrentEntry;
|
|
}
|
|
|
|
bool operator!=(const directory_iterator &RHS) const {
|
|
return !(*this == RHS);
|
|
}
|
|
// Other members as required by
|
|
// C++ Std, 24.1.1 Input iterators [input.iterators]
|
|
};
|
|
|
|
namespace detail {
|
|
/// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
|
|
/// reference counted in order to preserve InputIterator semantics on copy.
|
|
struct RecDirIterState : public RefCountedBase<RecDirIterState> {
|
|
RecDirIterState()
|
|
: Level(0)
|
|
, HasNoPushRequest(false) {}
|
|
|
|
std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
|
|
uint16_t Level;
|
|
bool HasNoPushRequest;
|
|
};
|
|
}
|
|
|
|
/// recursive_directory_iterator - Same as directory_iterator except for it
|
|
/// recurses down into child directories.
|
|
class recursive_directory_iterator {
|
|
IntrusiveRefCntPtr<detail::RecDirIterState> State;
|
|
|
|
public:
|
|
recursive_directory_iterator() {}
|
|
explicit recursive_directory_iterator(const Twine &path, error_code &ec)
|
|
: State(new detail::RecDirIterState) {
|
|
State->Stack.push(directory_iterator(path, ec));
|
|
if (State->Stack.top() == directory_iterator())
|
|
State.reset();
|
|
}
|
|
// No operator++ because we need error_code.
|
|
recursive_directory_iterator &increment(error_code &ec) {
|
|
static const directory_iterator end_itr;
|
|
|
|
if (State->HasNoPushRequest)
|
|
State->HasNoPushRequest = false;
|
|
else {
|
|
file_status st;
|
|
if ((ec = State->Stack.top()->status(st))) return *this;
|
|
if (is_directory(st)) {
|
|
State->Stack.push(directory_iterator(*State->Stack.top(), ec));
|
|
if (ec) return *this;
|
|
if (State->Stack.top() != end_itr) {
|
|
++State->Level;
|
|
return *this;
|
|
}
|
|
State->Stack.pop();
|
|
}
|
|
}
|
|
|
|
while (!State->Stack.empty()
|
|
&& State->Stack.top().increment(ec) == end_itr) {
|
|
State->Stack.pop();
|
|
--State->Level;
|
|
}
|
|
|
|
// Check if we are done. If so, create an end iterator.
|
|
if (State->Stack.empty())
|
|
State.reset();
|
|
|
|
return *this;
|
|
}
|
|
|
|
const directory_entry &operator*() const { return *State->Stack.top(); }
|
|
const directory_entry *operator->() const { return &*State->Stack.top(); }
|
|
|
|
// observers
|
|
/// Gets the current level. Starting path is at level 0.
|
|
int level() const { return State->Level; }
|
|
|
|
/// Returns true if no_push has been called for this directory_entry.
|
|
bool no_push_request() const { return State->HasNoPushRequest; }
|
|
|
|
// modifiers
|
|
/// Goes up one level if Level > 0.
|
|
void pop() {
|
|
assert(State && "Cannot pop and end itertor!");
|
|
assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
|
|
|
|
static const directory_iterator end_itr;
|
|
error_code ec;
|
|
do {
|
|
if (ec)
|
|
report_fatal_error("Error incrementing directory iterator.");
|
|
State->Stack.pop();
|
|
--State->Level;
|
|
} while (!State->Stack.empty()
|
|
&& State->Stack.top().increment(ec) == end_itr);
|
|
|
|
// Check if we are done. If so, create an end iterator.
|
|
if (State->Stack.empty())
|
|
State.reset();
|
|
}
|
|
|
|
/// Does not go down into the current directory_entry.
|
|
void no_push() { State->HasNoPushRequest = true; }
|
|
|
|
bool operator==(const recursive_directory_iterator &RHS) const {
|
|
return State == RHS.State;
|
|
}
|
|
|
|
bool operator!=(const recursive_directory_iterator &RHS) const {
|
|
return !(*this == RHS);
|
|
}
|
|
// Other members as required by
|
|
// C++ Std, 24.1.1 Input iterators [input.iterators]
|
|
};
|
|
|
|
/// @}
|
|
|
|
} // end namespace fs
|
|
} // end namespace sys
|
|
} // end namespace llvm
|
|
|
|
#endif
|