1 //===-- Path.cpp - Implement OS Path Concept --------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This header file implements the operating system Path concept. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Support/Path.h" 15 #include "llvm/Config/config.h" 16 #include "llvm/Support/Endian.h" 17 #include "llvm/Support/FileSystem.h" 18 #include <cassert> 19 #include <cstring> 20 #include <ostream> 21 using namespace llvm; 22 using namespace sys; 23 namespace { 24 using support::ulittle32_t; 25 } 26 27 //===----------------------------------------------------------------------===// 28 //=== WARNING: Implementation here must contain only TRULY operating system 29 //=== independent code. 30 //===----------------------------------------------------------------------===// 31 32 bool Path::operator==(const Path &that) const { 33 return path == that.path; 34 } 35 36 bool Path::operator<(const Path& that) const { 37 return path < that.path; 38 } 39 40 bool 41 Path::isArchive() const { 42 fs::file_magic type; 43 if (fs::identify_magic(str(), type)) 44 return false; 45 return type == fs::file_magic::archive; 46 } 47 48 bool 49 Path::isDynamicLibrary() const { 50 fs::file_magic type; 51 if (fs::identify_magic(str(), type)) 52 return false; 53 switch (type) { 54 default: return false; 55 case fs::file_magic::macho_fixed_virtual_memory_shared_lib: 56 case fs::file_magic::macho_dynamically_linked_shared_lib: 57 case fs::file_magic::macho_dynamically_linked_shared_lib_stub: 58 case fs::file_magic::elf_shared_object: 59 case fs::file_magic::pecoff_executable: return true; 60 } 61 } 62 63 bool 64 Path::isObjectFile() const { 65 fs::file_magic type; 66 if (fs::identify_magic(str(), type) || type == fs::file_magic::unknown) 67 return false; 68 return true; 69 } 70 71 StringRef Path::GetDLLSuffix() { 72 return &(LTDL_SHLIB_EXT[1]); 73 } 74 75 void 76 Path::appendSuffix(StringRef suffix) { 77 if (!suffix.empty()) { 78 path.append("."); 79 path.append(suffix); 80 } 81 } 82 83 bool 84 Path::isBitcodeFile() const { 85 fs::file_magic type; 86 if (fs::identify_magic(str(), type)) 87 return false; 88 return type == fs::file_magic::bitcode; 89 } 90 91 bool Path::hasMagicNumber(StringRef Magic) const { 92 std::string actualMagic; 93 if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size()))) 94 return Magic == actualMagic; 95 return false; 96 } 97 98 static void getPathList(const char*path, std::vector<Path>& Paths) { 99 const char* at = path; 100 const char* delim = strchr(at, PathSeparator); 101 Path tmpPath; 102 while (delim != 0) { 103 std::string tmp(at, size_t(delim-at)); 104 if (tmpPath.set(tmp)) 105 if (tmpPath.canRead()) 106 Paths.push_back(tmpPath); 107 at = delim + 1; 108 delim = strchr(at, PathSeparator); 109 } 110 111 if (*at != 0) 112 if (tmpPath.set(std::string(at))) 113 if (tmpPath.canRead()) 114 Paths.push_back(tmpPath); 115 } 116 117 static StringRef getDirnameCharSep(StringRef path, const char *Sep) { 118 assert(Sep[0] != '\0' && Sep[1] == '\0' && 119 "Sep must be a 1-character string literal."); 120 if (path.empty()) 121 return "."; 122 123 // If the path is all slashes, return a single slash. 124 // Otherwise, remove all trailing slashes. 125 126 signed pos = static_cast<signed>(path.size()) - 1; 127 128 while (pos >= 0 && path[pos] == Sep[0]) 129 --pos; 130 131 if (pos < 0) 132 return path[0] == Sep[0] ? Sep : "."; 133 134 // Any slashes left? 135 signed i = 0; 136 137 while (i < pos && path[i] != Sep[0]) 138 ++i; 139 140 if (i == pos) // No slashes? Return "." 141 return "."; 142 143 // There is at least one slash left. Remove all trailing non-slashes. 144 while (pos >= 0 && path[pos] != Sep[0]) 145 --pos; 146 147 // Remove any trailing slashes. 148 while (pos >= 0 && path[pos] == Sep[0]) 149 --pos; 150 151 if (pos < 0) 152 return path[0] == Sep[0] ? Sep : "."; 153 154 return path.substr(0, pos+1); 155 } 156 157 // Include the truly platform-specific parts of this class. 158 #if defined(LLVM_ON_UNIX) 159 #include "Unix/Path.inc" 160 #endif 161 #if defined(LLVM_ON_WIN32) 162 #include "Windows/Path.inc" 163 #endif 164