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/Support/FileSystem.h" 16#include "llvm/Config/config.h" 17#include "llvm/Support/FileSystem.h" 18#include "llvm/Support/Endian.h" 19#include <cassert> 20#include <cstring> 21#include <ostream> 22using namespace llvm; 23using namespace sys; 24namespace { 25using support::ulittle32_t; 26} 27 28//===----------------------------------------------------------------------===// 29//=== WARNING: Implementation here must contain only TRULY operating system 30//=== independent code. 31//===----------------------------------------------------------------------===// 32 33bool Path::operator==(const Path &that) const { 34 return path == that.path; 35} 36 37bool Path::operator<(const Path& that) const { 38 return path < that.path; 39} 40 41LLVMFileType 42sys::IdentifyFileType(const char *magic, unsigned length) { 43 assert(magic && "Invalid magic number string"); 44 assert(length >=4 && "Invalid magic number length"); 45 switch ((unsigned char)magic[0]) { 46 case 0xDE: // 0x0B17C0DE = BC wraper 47 if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 && 48 magic[3] == (char)0x0B) 49 return Bitcode_FileType; 50 break; 51 case 'B': 52 if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE) 53 return Bitcode_FileType; 54 break; 55 case '!': 56 if (length >= 8) 57 if (memcmp(magic,"!<arch>\n",8) == 0) 58 return Archive_FileType; 59 break; 60 61 case '\177': 62 if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') { 63 bool Data2MSB = magic[5] == 2; 64 unsigned high = Data2MSB ? 16 : 17; 65 unsigned low = Data2MSB ? 17 : 16; 66 if (length >= 18 && magic[high] == 0) 67 switch (magic[low]) { 68 default: break; 69 case 1: return ELF_Relocatable_FileType; 70 case 2: return ELF_Executable_FileType; 71 case 3: return ELF_SharedObject_FileType; 72 case 4: return ELF_Core_FileType; 73 } 74 } 75 break; 76 77 case 0xCA: 78 if (magic[1] == char(0xFE) && magic[2] == char(0xBA) && 79 magic[3] == char(0xBE)) { 80 // This is complicated by an overlap with Java class files. 81 // See the Mach-O section in /usr/share/file/magic for details. 82 if (length >= 8 && magic[7] < 43) 83 // FIXME: Universal Binary of any type. 84 return Mach_O_DynamicallyLinkedSharedLib_FileType; 85 } 86 break; 87 88 // The two magic numbers for mach-o are: 89 // 0xfeedface - 32-bit mach-o 90 // 0xfeedfacf - 64-bit mach-o 91 case 0xFE: 92 case 0xCE: 93 case 0xCF: { 94 uint16_t type = 0; 95 if (magic[0] == char(0xFE) && magic[1] == char(0xED) && 96 magic[2] == char(0xFA) && 97 (magic[3] == char(0xCE) || magic[3] == char(0xCF))) { 98 /* Native endian */ 99 if (length >= 16) type = magic[14] << 8 | magic[15]; 100 } else if ((magic[0] == char(0xCE) || magic[0] == char(0xCF)) && 101 magic[1] == char(0xFA) && magic[2] == char(0xED) && 102 magic[3] == char(0xFE)) { 103 /* Reverse endian */ 104 if (length >= 14) type = magic[13] << 8 | magic[12]; 105 } 106 switch (type) { 107 default: break; 108 case 1: return Mach_O_Object_FileType; 109 case 2: return Mach_O_Executable_FileType; 110 case 3: return Mach_O_FixedVirtualMemorySharedLib_FileType; 111 case 4: return Mach_O_Core_FileType; 112 case 5: return Mach_O_PreloadExecutable_FileType; 113 case 6: return Mach_O_DynamicallyLinkedSharedLib_FileType; 114 case 7: return Mach_O_DynamicLinker_FileType; 115 case 8: return Mach_O_Bundle_FileType; 116 case 9: return Mach_O_DynamicallyLinkedSharedLibStub_FileType; 117 case 10: return Mach_O_DSYMCompanion_FileType; 118 } 119 break; 120 } 121 case 0xF0: // PowerPC Windows 122 case 0x83: // Alpha 32-bit 123 case 0x84: // Alpha 64-bit 124 case 0x66: // MPS R4000 Windows 125 case 0x50: // mc68K 126 case 0x4c: // 80386 Windows 127 if (magic[1] == 0x01) 128 return COFF_FileType; 129 130 case 0x90: // PA-RISC Windows 131 case 0x68: // mc68K Windows 132 if (magic[1] == 0x02) 133 return COFF_FileType; 134 break; 135 136 case 0x4d: // Possible MS-DOS stub on Windows PE file 137 if (magic[1] == 0x5a) { 138 uint32_t off = *reinterpret_cast<const ulittle32_t *>(magic + 0x3c); 139 // PE/COFF file, either EXE or DLL. 140 if (off < length && memcmp(magic + off, "PE\0\0",4) == 0) 141 return COFF_FileType; 142 } 143 break; 144 145 case 0x64: // x86-64 Windows. 146 if (magic[1] == char(0x86)) 147 return COFF_FileType; 148 break; 149 150 default: 151 break; 152 } 153 return Unknown_FileType; 154} 155 156bool 157Path::isArchive() const { 158 fs::file_magic type; 159 if (fs::identify_magic(str(), type)) 160 return false; 161 return type == fs::file_magic::archive; 162} 163 164bool 165Path::isDynamicLibrary() const { 166 fs::file_magic type; 167 if (fs::identify_magic(str(), type)) 168 return false; 169 switch (type) { 170 default: return false; 171 case fs::file_magic::macho_fixed_virtual_memory_shared_lib: 172 case fs::file_magic::macho_dynamically_linked_shared_lib: 173 case fs::file_magic::macho_dynamically_linked_shared_lib_stub: 174 case fs::file_magic::elf_shared_object: 175 case fs::file_magic::pecoff_executable: return true; 176 } 177} 178 179bool 180Path::isObjectFile() const { 181 fs::file_magic type; 182 if (fs::identify_magic(str(), type) || type == fs::file_magic::unknown) 183 return false; 184 return true; 185} 186 187Path 188Path::FindLibrary(std::string& name) { 189 std::vector<sys::Path> LibPaths; 190 GetSystemLibraryPaths(LibPaths); 191 for (unsigned i = 0; i < LibPaths.size(); ++i) { 192 sys::Path FullPath(LibPaths[i]); 193 FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT); 194 if (FullPath.isDynamicLibrary()) 195 return FullPath; 196 FullPath.eraseSuffix(); 197 FullPath.appendSuffix("a"); 198 if (FullPath.isArchive()) 199 return FullPath; 200 } 201 return sys::Path(); 202} 203 204StringRef Path::GetDLLSuffix() { 205 return &(LTDL_SHLIB_EXT[1]); 206} 207 208void 209Path::appendSuffix(StringRef suffix) { 210 if (!suffix.empty()) { 211 path.append("."); 212 path.append(suffix); 213 } 214} 215 216bool 217Path::isBitcodeFile() const { 218 fs::file_magic type; 219 if (fs::identify_magic(str(), type)) 220 return false; 221 return type == fs::file_magic::bitcode; 222} 223 224bool Path::hasMagicNumber(StringRef Magic) const { 225 std::string actualMagic; 226 if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size()))) 227 return Magic == actualMagic; 228 return false; 229} 230 231static void getPathList(const char*path, std::vector<Path>& Paths) { 232 const char* at = path; 233 const char* delim = strchr(at, PathSeparator); 234 Path tmpPath; 235 while (delim != 0) { 236 std::string tmp(at, size_t(delim-at)); 237 if (tmpPath.set(tmp)) 238 if (tmpPath.canRead()) 239 Paths.push_back(tmpPath); 240 at = delim + 1; 241 delim = strchr(at, PathSeparator); 242 } 243 244 if (*at != 0) 245 if (tmpPath.set(std::string(at))) 246 if (tmpPath.canRead()) 247 Paths.push_back(tmpPath); 248} 249 250static StringRef getDirnameCharSep(StringRef path, const char *Sep) { 251 assert(Sep[0] != '\0' && Sep[1] == '\0' && 252 "Sep must be a 1-character string literal."); 253 if (path.empty()) 254 return "."; 255 256 // If the path is all slashes, return a single slash. 257 // Otherwise, remove all trailing slashes. 258 259 signed pos = static_cast<signed>(path.size()) - 1; 260 261 while (pos >= 0 && path[pos] == Sep[0]) 262 --pos; 263 264 if (pos < 0) 265 return path[0] == Sep[0] ? Sep : "."; 266 267 // Any slashes left? 268 signed i = 0; 269 270 while (i < pos && path[i] != Sep[0]) 271 ++i; 272 273 if (i == pos) // No slashes? Return "." 274 return "."; 275 276 // There is at least one slash left. Remove all trailing non-slashes. 277 while (pos >= 0 && path[pos] != Sep[0]) 278 --pos; 279 280 // Remove any trailing slashes. 281 while (pos >= 0 && path[pos] == Sep[0]) 282 --pos; 283 284 if (pos < 0) 285 return path[0] == Sep[0] ? Sep : "."; 286 287 return path.substr(0, pos+1); 288} 289 290// Include the truly platform-specific parts of this class. 291#if defined(LLVM_ON_UNIX) 292#include "Unix/Path.inc" 293#endif 294#if defined(LLVM_ON_WIN32) 295#include "Windows/Path.inc" 296#endif 297