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"
22 //===----------------------------------------------------------------------===//
23 //=== WARNING: Implementation here must contain only TRULY operating system
24 //=== independent code.
25 //===----------------------------------------------------------------------===//
27 bool Path::operator==(const Path &that) const {
28 return path == that.path;
31 bool Path::operator<(const Path& that) const {
32 return path < that.path;
36 Path::GetLLVMConfigDir() {
39 if (result.set(LLVM_ETCDIR))
42 return GetLLVMDefaultConfigDir();
46 sys::IdentifyFileType(const char *magic, unsigned length) {
47 assert(magic && "Invalid magic number string");
48 assert(length >=4 && "Invalid magic number length");
49 switch ((unsigned char)magic[0]) {
50 case 0xDE: // 0x0B17C0DE = BC wraper
51 if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 &&
52 magic[3] == (char)0x0B)
53 return Bitcode_FileType;
56 if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE)
57 return Bitcode_FileType;
61 if (memcmp(magic,"!<arch>\n",8) == 0)
62 return Archive_FileType;
66 if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') {
67 if (length >= 18 && magic[17] == 0)
70 case 1: return ELF_Relocatable_FileType;
71 case 2: return ELF_Executable_FileType;
72 case 3: return ELF_SharedObject_FileType;
73 case 4: return ELF_Core_FileType;
79 if (magic[1] == char(0xFE) && magic[2] == char(0xBA) &&
80 magic[3] == char(0xBE)) {
81 // This is complicated by an overlap with Java class files.
82 // See the Mach-O section in /usr/share/file/magic for details.
83 if (length >= 8 && magic[7] < 43)
84 // FIXME: Universal Binary of any type.
85 return Mach_O_DynamicallyLinkedSharedLib_FileType;
92 if (magic[0] == char(0xFE) && magic[1] == char(0xED) &&
93 magic[2] == char(0xFA) && magic[3] == char(0xCE)) {
95 if (length >= 16) type = magic[14] << 8 | magic[15];
96 } else if (magic[0] == char(0xCE) && magic[1] == char(0xFA) &&
97 magic[2] == char(0xED) && magic[3] == char(0xFE)) {
99 if (length >= 14) type = magic[13] << 8 | magic[12];
103 case 1: return Mach_O_Object_FileType;
104 case 2: return Mach_O_Executable_FileType;
105 case 3: return Mach_O_FixedVirtualMemorySharedLib_FileType;
106 case 4: return Mach_O_Core_FileType;
107 case 5: return Mach_O_PreloadExecutable_FileType;
108 case 6: return Mach_O_DynamicallyLinkedSharedLib_FileType;
109 case 7: return Mach_O_DynamicLinker_FileType;
110 case 8: return Mach_O_Bundle_FileType;
111 case 9: return Mach_O_DynamicallyLinkedSharedLibStub_FileType;
112 case 10: break; // FIXME: MH_DSYM companion file with only debug.
116 case 0xF0: // PowerPC Windows
117 case 0x83: // Alpha 32-bit
118 case 0x84: // Alpha 64-bit
119 case 0x66: // MPS R4000 Windows
121 case 0x4c: // 80386 Windows
122 if (magic[1] == 0x01)
123 return COFF_FileType;
125 case 0x90: // PA-RISC Windows
126 case 0x68: // mc68K Windows
127 if (magic[1] == 0x02)
128 return COFF_FileType;
130 case 0x64: // x86-64 Windows.
131 if (magic[1] == char(0x86))
132 return COFF_FileType;
138 return Unknown_FileType;
142 Path::isArchive() const {
144 if (getMagicNumber(Magic, 8))
145 if (IdentifyFileType(Magic.c_str(), Magic.length()) == Archive_FileType)
151 Path::isDynamicLibrary() const {
153 if (getMagicNumber(Magic, 64))
154 switch (IdentifyFileType(Magic.c_str(),
155 static_cast<unsigned>(Magic.length()))) {
156 default: return false;
157 case Mach_O_FixedVirtualMemorySharedLib_FileType:
158 case Mach_O_DynamicallyLinkedSharedLib_FileType:
159 case Mach_O_DynamicallyLinkedSharedLibStub_FileType:
160 case ELF_SharedObject_FileType:
161 case COFF_FileType: return true;
168 Path::isObjectFile() const {
170 if (getMagicNumber(Magic, 64))
171 if (IdentifyFileType(Magic.c_str(),
172 static_cast<unsigned>(Magic.length()))
173 != Unknown_FileType) {
174 // Everything in LLVMFileType is currently an object file.
182 Path::FindLibrary(std::string& name) {
183 std::vector<sys::Path> LibPaths;
184 GetSystemLibraryPaths(LibPaths);
185 for (unsigned i = 0; i < LibPaths.size(); ++i) {
186 sys::Path FullPath(LibPaths[i]);
187 FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT);
188 if (FullPath.isDynamicLibrary())
190 FullPath.eraseSuffix();
191 FullPath.appendSuffix("a");
192 if (FullPath.isArchive())
198 StringRef Path::GetDLLSuffix() {
199 return &(LTDL_SHLIB_EXT[1]);
203 Path::appendSuffix(StringRef suffix) {
204 if (!suffix.empty()) {
211 Path::isBitcodeFile() const {
212 std::string actualMagic;
213 if (!getMagicNumber(actualMagic, 4))
216 IdentifyFileType(actualMagic.c_str(),
217 static_cast<unsigned>(actualMagic.length()));
218 return FT == Bitcode_FileType;
221 bool Path::hasMagicNumber(StringRef Magic) const {
222 std::string actualMagic;
223 if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size())))
224 return Magic == actualMagic;
228 static void getPathList(const char*path, std::vector<Path>& Paths) {
229 const char* at = path;
230 const char* delim = strchr(at, PathSeparator);
233 std::string tmp(at, size_t(delim-at));
234 if (tmpPath.set(tmp))
235 if (tmpPath.canRead())
236 Paths.push_back(tmpPath);
238 delim = strchr(at, PathSeparator);
242 if (tmpPath.set(std::string(at)))
243 if (tmpPath.canRead())
244 Paths.push_back(tmpPath);
247 static StringRef getDirnameCharSep(StringRef path, const char *Sep) {
248 assert(Sep[0] != '\0' && Sep[1] == '\0' &&
249 "Sep must be a 1-character string literal.");
253 // If the path is all slashes, return a single slash.
254 // Otherwise, remove all trailing slashes.
256 signed pos = static_cast<signed>(path.size()) - 1;
258 while (pos >= 0 && path[pos] == Sep[0])
262 return path[0] == Sep[0] ? Sep : ".";
267 while (i < pos && path[i] != Sep[0])
270 if (i == pos) // No slashes? Return "."
273 // There is at least one slash left. Remove all trailing non-slashes.
274 while (pos >= 0 && path[pos] != Sep[0])
277 // Remove any trailing slashes.
278 while (pos >= 0 && path[pos] == Sep[0])
282 return path[0] == Sep[0] ? Sep : ".";
284 return path.substr(0, pos+1);
287 // Include the truly platform-specific parts of this class.
288 #if defined(LLVM_ON_UNIX)
289 #include "Unix/Path.inc"
291 #if defined(LLVM_ON_WIN32)
292 #include "Windows/Path.inc"