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267 lines
7.5 KiB
C++
267 lines
7.5 KiB
C++
//===-- Path.cpp - Implement OS Path Concept --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header file implements the operating system Path concept.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/System/Path.h"
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#include "llvm/Config/config.h"
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#include <cassert>
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#include <cstring>
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#include <ostream>
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using namespace llvm;
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using namespace sys;
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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bool Path::operator==(const Path &that) const {
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return path == that.path;
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}
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bool Path::operator<(const Path& that) const {
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return path < that.path;
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}
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Path
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Path::GetLLVMConfigDir() {
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Path result;
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#ifdef LLVM_ETCDIR
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if (result.set(LLVM_ETCDIR))
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return result;
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#endif
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return GetLLVMDefaultConfigDir();
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}
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LLVMFileType
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sys::IdentifyFileType(const char *magic, unsigned length) {
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assert(magic && "Invalid magic number string");
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assert(length >=4 && "Invalid magic number length");
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switch ((unsigned char)magic[0]) {
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case 0xDE: // 0x0B17C0DE = BC wraper
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if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 &&
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magic[3] == (char)0x0B)
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return Bitcode_FileType;
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break;
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case 'B':
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if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE)
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return Bitcode_FileType;
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break;
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case '!':
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if (length >= 8)
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if (memcmp(magic,"!<arch>\n",8) == 0)
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return Archive_FileType;
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break;
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case '\177':
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if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') {
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if (length >= 18 && magic[17] == 0)
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switch (magic[16]) {
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default: break;
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case 1: return ELF_Relocatable_FileType;
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case 2: return ELF_Executable_FileType;
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case 3: return ELF_SharedObject_FileType;
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case 4: return ELF_Core_FileType;
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}
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}
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break;
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case 0xCA:
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if (magic[1] == char(0xFE) && magic[2] == char(0xBA) &&
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magic[3] == char(0xBE)) {
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// This is complicated by an overlap with Java class files.
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// See the Mach-O section in /usr/share/file/magic for details.
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if (length >= 8 && magic[7] < 43)
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// FIXME: Universal Binary of any type.
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return Mach_O_DynamicallyLinkedSharedLib_FileType;
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}
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break;
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case 0xFE:
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case 0xCE: {
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uint16_t type = 0;
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if (magic[0] == char(0xFE) && magic[1] == char(0xED) &&
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magic[2] == char(0xFA) && magic[3] == char(0xCE)) {
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/* Native endian */
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if (length >= 16) type = magic[14] << 8 | magic[15];
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} else if (magic[0] == char(0xCE) && magic[1] == char(0xFA) &&
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magic[2] == char(0xED) && magic[3] == char(0xFE)) {
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/* Reverse endian */
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if (length >= 14) type = magic[13] << 8 | magic[12];
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}
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switch (type) {
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default: break;
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case 1: return Mach_O_Object_FileType;
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case 2: return Mach_O_Executable_FileType;
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case 3: return Mach_O_FixedVirtualMemorySharedLib_FileType;
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case 4: return Mach_O_Core_FileType;
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case 5: return Mach_O_PreloadExectuable_FileType;
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case 6: return Mach_O_DynamicallyLinkedSharedLib_FileType;
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case 7: return Mach_O_DynamicLinker_FileType;
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case 8: return Mach_O_Bundle_FileType;
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case 9: return Mach_O_DynamicallyLinkedSharedLibStub_FileType;
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case 10: break; // FIXME: MH_DSYM companion file with only debug.
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}
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break;
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}
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case 0xF0: // PowerPC Windows
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case 0x83: // Alpha 32-bit
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case 0x84: // Alpha 64-bit
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case 0x66: // MPS R4000 Windows
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case 0x50: // mc68K
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case 0x4c: // 80386 Windows
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if (magic[1] == 0x01)
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return COFF_FileType;
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case 0x90: // PA-RISC Windows
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case 0x68: // mc68K Windows
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if (magic[1] == 0x02)
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return COFF_FileType;
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break;
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default:
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break;
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}
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return Unknown_FileType;
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}
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bool
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Path::isArchive() const {
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if (canRead())
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return hasMagicNumber("!<arch>\012");
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return false;
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}
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bool
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Path::isDynamicLibrary() const {
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if (canRead()) {
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std::string Magic;
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if (getMagicNumber(Magic, 64))
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switch (IdentifyFileType(Magic.c_str(),
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static_cast<unsigned>(Magic.length()))) {
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default: return false;
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case Mach_O_FixedVirtualMemorySharedLib_FileType:
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case Mach_O_DynamicallyLinkedSharedLib_FileType:
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case Mach_O_DynamicallyLinkedSharedLibStub_FileType:
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case ELF_SharedObject_FileType:
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case COFF_FileType: return true;
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}
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}
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return false;
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}
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Path
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Path::FindLibrary(std::string& name) {
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std::vector<sys::Path> LibPaths;
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GetSystemLibraryPaths(LibPaths);
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for (unsigned i = 0; i < LibPaths.size(); ++i) {
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sys::Path FullPath(LibPaths[i]);
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FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT);
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if (FullPath.isDynamicLibrary())
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return FullPath;
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FullPath.eraseSuffix();
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FullPath.appendSuffix("a");
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if (FullPath.isArchive())
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return FullPath;
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}
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return sys::Path();
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}
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std::string Path::GetDLLSuffix() {
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return LTDL_SHLIB_EXT;
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}
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bool
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Path::isBitcodeFile() const {
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std::string actualMagic;
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if (!getMagicNumber(actualMagic, 4))
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return false;
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LLVMFileType FT =
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IdentifyFileType(actualMagic.c_str(),
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static_cast<unsigned>(actualMagic.length()));
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return FT == Bitcode_FileType;
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}
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bool Path::hasMagicNumber(const std::string &Magic) const {
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std::string actualMagic;
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if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size())))
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return Magic == actualMagic;
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return false;
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}
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static void getPathList(const char*path, std::vector<Path>& Paths) {
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const char* at = path;
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const char* delim = strchr(at, PathSeparator);
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Path tmpPath;
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while (delim != 0) {
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std::string tmp(at, size_t(delim-at));
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if (tmpPath.set(tmp))
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if (tmpPath.canRead())
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Paths.push_back(tmpPath);
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at = delim + 1;
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delim = strchr(at, PathSeparator);
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}
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if (*at != 0)
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if (tmpPath.set(std::string(at)))
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if (tmpPath.canRead())
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Paths.push_back(tmpPath);
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}
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static std::string getDirnameCharSep(const std::string& path, char Sep) {
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if (path.empty())
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return ".";
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// If the path is all slashes, return a single slash.
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// Otherwise, remove all trailing slashes.
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signed pos = static_cast<signed>(path.size()) - 1;
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while (pos >= 0 && path[pos] == Sep)
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--pos;
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if (pos < 0)
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return path[0] == Sep ? std::string(1, Sep) : std::string(".");
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// Any slashes left?
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signed i = 0;
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while (i < pos && path[i] != Sep)
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++i;
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if (i == pos) // No slashes? Return "."
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return ".";
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// There is at least one slash left. Remove all trailing non-slashes.
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while (pos >= 0 && path[pos] != Sep)
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--pos;
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// Remove any trailing slashes.
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while (pos >= 0 && path[pos] == Sep)
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--pos;
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if (pos < 0)
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return path[0] == Sep ? std::string(1, Sep) : std::string(".");
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return path.substr(0, pos+1);
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}
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// Include the truly platform-specific parts of this class.
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#if defined(LLVM_ON_UNIX)
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#include "Unix/Path.inc"
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#endif
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#if defined(LLVM_ON_WIN32)
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#include "Win32/Path.inc"
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#endif
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