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https://github.com/c64scene-ar/llvm-6502.git
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bc files for modules with a target triple that indicates they are for darwin. The reader unconditionally handles this, and the writer could turn this on for more targets if we care. This change has two benefits for darwin: 1) it allows us to encode the cpu type of the file in an easy to read place that doesn't require decoding the bc file. 2) it works around a bug (IMO) in darwin's AR where it is incapable of handling files that are not a multiple of 8 bytes long. BC files are only guaranteed to be multiples of 4 bytes long. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53275 91177308-0d34-0410-b5e6-96231b3b80d8
273 lines
7.5 KiB
C++
273 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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bool Path::operator<(const Path& that) const {
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return path < that.path;
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}
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std::ostream& llvm::operator<<(std::ostream &strm, const sys::Path &aPath) {
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strm << aPath.toString();
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return strm;
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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 (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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return actualMagic == "BC\xC0\xDE";
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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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