1 //===-- Path.cpp - Implement OS Path Concept --------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This header file implements the operating system Path concept.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Support/Path.h"
15 #include "llvm/Config/config.h"
16 #include "llvm/Support/FileSystem.h"
23 //===----------------------------------------------------------------------===//
24 //=== WARNING: Implementation here must contain only TRULY operating system
25 //=== independent code.
26 //===----------------------------------------------------------------------===//
28 bool Path::operator==(const Path &that) const {
29 return path == that.path;
32 bool Path::operator<(const Path& that) const {
33 return path < that.path;
37 Path::GetLLVMConfigDir() {
40 if (result.set(LLVM_ETCDIR))
43 return GetLLVMDefaultConfigDir();
47 sys::IdentifyFileType(const char *magic, unsigned length) {
48 assert(magic && "Invalid magic number string");
49 assert(length >=4 && "Invalid magic number length");
50 switch ((unsigned char)magic[0]) {
51 case 0xDE: // 0x0B17C0DE = BC wraper
52 if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 &&
53 magic[3] == (char)0x0B)
54 return Bitcode_FileType;
57 if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE)
58 return Bitcode_FileType;
62 if (memcmp(magic,"!<arch>\n",8) == 0)
63 return Archive_FileType;
67 if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') {
68 if (length >= 18 && magic[17] == 0)
71 case 1: return ELF_Relocatable_FileType;
72 case 2: return ELF_Executable_FileType;
73 case 3: return ELF_SharedObject_FileType;
74 case 4: return ELF_Core_FileType;
80 if (magic[1] == char(0xFE) && magic[2] == char(0xBA) &&
81 magic[3] == char(0xBE)) {
82 // This is complicated by an overlap with Java class files.
83 // See the Mach-O section in /usr/share/file/magic for details.
84 if (length >= 8 && magic[7] < 43)
85 // FIXME: Universal Binary of any type.
86 return Mach_O_DynamicallyLinkedSharedLib_FileType;
93 if (magic[0] == char(0xFE) && magic[1] == char(0xED) &&
94 magic[2] == char(0xFA) && magic[3] == char(0xCE)) {
96 if (length >= 16) type = magic[14] << 8 | magic[15];
97 } else if (magic[0] == char(0xCE) && magic[1] == char(0xFA) &&
98 magic[2] == char(0xED) && magic[3] == char(0xFE)) {
100 if (length >= 14) type = magic[13] << 8 | magic[12];
104 case 1: return Mach_O_Object_FileType;
105 case 2: return Mach_O_Executable_FileType;
106 case 3: return Mach_O_FixedVirtualMemorySharedLib_FileType;
107 case 4: return Mach_O_Core_FileType;
108 case 5: return Mach_O_PreloadExecutable_FileType;
109 case 6: return Mach_O_DynamicallyLinkedSharedLib_FileType;
110 case 7: return Mach_O_DynamicLinker_FileType;
111 case 8: return Mach_O_Bundle_FileType;
112 case 9: return Mach_O_DynamicallyLinkedSharedLibStub_FileType;
113 case 10: break; // FIXME: MH_DSYM companion file with only debug.
117 case 0xF0: // PowerPC Windows
118 case 0x83: // Alpha 32-bit
119 case 0x84: // Alpha 64-bit
120 case 0x66: // MPS R4000 Windows
122 case 0x4c: // 80386 Windows
123 if (magic[1] == 0x01)
124 return COFF_FileType;
126 case 0x90: // PA-RISC Windows
127 case 0x68: // mc68K Windows
128 if (magic[1] == 0x02)
129 return COFF_FileType;
131 case 0x64: // x86-64 Windows.
132 if (magic[1] == char(0x86))
133 return COFF_FileType;
139 return Unknown_FileType;
143 Path::isArchive() const {
145 if (getMagicNumber(Magic, 8))
146 if (IdentifyFileType(Magic.c_str(), Magic.length()) == Archive_FileType)
152 Path::isDynamicLibrary() const {
154 if (getMagicNumber(Magic, 64))
155 switch (IdentifyFileType(Magic.c_str(),
156 static_cast<unsigned>(Magic.length()))) {
157 default: return false;
158 case Mach_O_FixedVirtualMemorySharedLib_FileType:
159 case Mach_O_DynamicallyLinkedSharedLib_FileType:
160 case Mach_O_DynamicallyLinkedSharedLibStub_FileType:
161 case ELF_SharedObject_FileType:
162 case COFF_FileType: return true;
169 Path::isObjectFile() const {
171 if (getMagicNumber(Magic, 64))
172 if (IdentifyFileType(Magic.c_str(),
173 static_cast<unsigned>(Magic.length()))
174 != Unknown_FileType) {
175 // Everything in LLVMFileType is currently an object file.
183 Path::FindLibrary(std::string& name) {
184 std::vector<sys::Path> LibPaths;
185 GetSystemLibraryPaths(LibPaths);
186 for (unsigned i = 0; i < LibPaths.size(); ++i) {
187 sys::Path FullPath(LibPaths[i]);
188 FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT);
189 if (FullPath.isDynamicLibrary())
191 FullPath.eraseSuffix();
192 FullPath.appendSuffix("a");
193 if (FullPath.isArchive())
199 StringRef Path::GetDLLSuffix() {
200 return &(LTDL_SHLIB_EXT[1]);
204 Path::appendSuffix(StringRef suffix) {
205 if (!suffix.empty()) {
212 Path::isBitcodeFile() const {
213 std::string actualMagic;
214 if (!getMagicNumber(actualMagic, 4))
217 IdentifyFileType(actualMagic.c_str(),
218 static_cast<unsigned>(actualMagic.length()));
219 return FT == Bitcode_FileType;
222 bool Path::hasMagicNumber(StringRef Magic) const {
223 std::string actualMagic;
224 if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size())))
225 return Magic == actualMagic;
229 static void getPathList(const char*path, std::vector<Path>& Paths) {
230 const char* at = path;
231 const char* delim = strchr(at, PathSeparator);
234 std::string tmp(at, size_t(delim-at));
235 if (tmpPath.set(tmp))
236 if (tmpPath.canRead())
237 Paths.push_back(tmpPath);
239 delim = strchr(at, PathSeparator);
243 if (tmpPath.set(std::string(at)))
244 if (tmpPath.canRead())
245 Paths.push_back(tmpPath);
248 static StringRef getDirnameCharSep(StringRef path, const char *Sep) {
249 assert(Sep[0] != '\0' && Sep[1] == '\0' &&
250 "Sep must be a 1-character string literal.");
254 // If the path is all slashes, return a single slash.
255 // Otherwise, remove all trailing slashes.
257 signed pos = static_cast<signed>(path.size()) - 1;
259 while (pos >= 0 && path[pos] == Sep[0])
263 return path[0] == Sep[0] ? Sep : ".";
268 while (i < pos && path[i] != Sep[0])
271 if (i == pos) // No slashes? Return "."
274 // There is at least one slash left. Remove all trailing non-slashes.
275 while (pos >= 0 && path[pos] != Sep[0])
278 // Remove any trailing slashes.
279 while (pos >= 0 && path[pos] == Sep[0])
283 return path[0] == Sep[0] ? Sep : ".";
285 return path.substr(0, pos+1);
288 // Include the truly platform-specific parts of this class.
289 #if defined(LLVM_ON_UNIX)
290 #include "Unix/Path.inc"
292 #if defined(LLVM_ON_WIN32)
293 #include "Windows/Path.inc"