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 Path 72 Path::FindLibrary(std::string& name) { 73 std::vector<sys::Path> LibPaths; 74 GetSystemLibraryPaths(LibPaths); 75 for (unsigned i = 0; i < LibPaths.size(); ++i) { 76 sys::Path FullPath(LibPaths[i]); 77 FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT); 78 if (FullPath.isDynamicLibrary()) 79 return FullPath; 80 FullPath.eraseSuffix(); 81 FullPath.appendSuffix("a"); 82 if (FullPath.isArchive()) 83 return FullPath; 84 } 85 return sys::Path(); 86 } 87 88 StringRef Path::GetDLLSuffix() { 89 return &(LTDL_SHLIB_EXT[1]); 90 } 91 92 void 93 Path::appendSuffix(StringRef suffix) { 94 if (!suffix.empty()) { 95 path.append("."); 96 path.append(suffix); 97 } 98 } 99 100 bool 101 Path::isBitcodeFile() const { 102 fs::file_magic type; 103 if (fs::identify_magic(str(), type)) 104 return false; 105 return type == fs::file_magic::bitcode; 106 } 107 108 bool Path::hasMagicNumber(StringRef Magic) const { 109 std::string actualMagic; 110 if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size()))) 111 return Magic == actualMagic; 112 return false; 113 } 114 115 static void getPathList(const char*path, std::vector<Path>& Paths) { 116 const char* at = path; 117 const char* delim = strchr(at, PathSeparator); 118 Path tmpPath; 119 while (delim != 0) { 120 std::string tmp(at, size_t(delim-at)); 121 if (tmpPath.set(tmp)) 122 if (tmpPath.canRead()) 123 Paths.push_back(tmpPath); 124 at = delim + 1; 125 delim = strchr(at, PathSeparator); 126 } 127 128 if (*at != 0) 129 if (tmpPath.set(std::string(at))) 130 if (tmpPath.canRead()) 131 Paths.push_back(tmpPath); 132 } 133 134 static StringRef getDirnameCharSep(StringRef path, const char *Sep) { 135 assert(Sep[0] != '\0' && Sep[1] == '\0' && 136 "Sep must be a 1-character string literal."); 137 if (path.empty()) 138 return "."; 139 140 // If the path is all slashes, return a single slash. 141 // Otherwise, remove all trailing slashes. 142 143 signed pos = static_cast<signed>(path.size()) - 1; 144 145 while (pos >= 0 && path[pos] == Sep[0]) 146 --pos; 147 148 if (pos < 0) 149 return path[0] == Sep[0] ? Sep : "."; 150 151 // Any slashes left? 152 signed i = 0; 153 154 while (i < pos && path[i] != Sep[0]) 155 ++i; 156 157 if (i == pos) // No slashes? Return "." 158 return "."; 159 160 // There is at least one slash left. Remove all trailing non-slashes. 161 while (pos >= 0 && path[pos] != Sep[0]) 162 --pos; 163 164 // Remove any trailing slashes. 165 while (pos >= 0 && path[pos] == Sep[0]) 166 --pos; 167 168 if (pos < 0) 169 return path[0] == Sep[0] ? Sep : "."; 170 171 return path.substr(0, pos+1); 172 } 173 174 // Include the truly platform-specific parts of this class. 175 #if defined(LLVM_ON_UNIX) 176 #include "Unix/Path.inc" 177 #endif 178 #if defined(LLVM_ON_WIN32) 179 #include "Windows/Path.inc" 180 #endif 181