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//===-- Path.cpp - Implement OS Path Concept --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header file implements the operating system Path concept.
//
//===----------------------------------------------------------------------===//
#include "llvm/System/Path.h"
#include "llvm/Config/config.h"
#include <cassert>
#include <ostream>
using namespace llvm;
using namespace sys;
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
//=== independent code.
//===----------------------------------------------------------------------===//
std::ostream& llvm::operator<<(std::ostream &strm, const sys::Path &aPath) {
strm << aPath.toString();
return strm;
}
Path
Path::GetLLVMConfigDir() {
Path result;
#ifdef LLVM_ETCDIR
if (result.set(LLVM_ETCDIR))
return result;
#endif
return GetLLVMDefaultConfigDir();
}
LLVMFileType
sys::IdentifyFileType(const char*magic, unsigned length) {
assert(magic && "Invalid magic number string");
assert(length >=4 && "Invalid magic number length");
switch (magic[0]) {
case 'B':
if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE)
return Bitcode_FileType;
break;
case 'l':
if (magic[1] == 'l' && magic[2] == 'v') {
if (magic[3] == 'c')
return CompressedBytecode_FileType;
else if (magic[3] == 'm')
return Bytecode_FileType;
}
break;
case '!':
if (length >= 8)
if (memcmp(magic,"!<arch>\n",8) == 0)
return Archive_FileType;
break;
case '\177':
if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') {
if (length >= 18 && magic[17] == 0)
switch (magic[16]) {
default: break;
case 1: return ELF_Relocatable_FileType;
case 2: return ELF_Executable_FileType;
case 3: return ELF_SharedObject_FileType;
case 4: return ELF_Core_FileType;
}
}
break;
case 0xCA:
// This is complicated by an overlap with Java class files.
// See the Mach-O section in /usr/share/file/magic for details.
if (magic[1] == char(0xFE) && magic[2] == char(0xBA) &&
magic[3] == char(0xBE)) {
return Mach_O_DynamicallyLinkedSharedLib_FileType;
// FIXME: How does this work?
if (length >= 14 && magic[13] == 0)
switch (magic[12]) {
default: break;
case 1: return Mach_O_Object_FileType;
case 2: return Mach_O_Executable_FileType;
case 3: return Mach_O_FixedVirtualMemorySharedLib_FileType;
case 4: return Mach_O_Core_FileType;
case 5: return Mach_O_PreloadExectuable_FileType;
case 6: return Mach_O_DynamicallyLinkedSharedLib_FileType;
case 7: return Mach_O_DynamicLinker_FileType;
case 8: return Mach_O_Bundle_FileType;
case 9: return Mach_O_DynamicallyLinkedSharedLibStub_FileType;
}
}
break;
case 0xF0: // PowerPC Windows
case 0x83: // Alpha 32-bit
case 0x84: // Alpha 64-bit
case 0x66: // MPS R4000 Windows
case 0x50: // mc68K
case 0x4c: // 80386 Windows
if (magic[1] == 0x01)
return COFF_FileType;
case 0x90: // PA-RISC Windows
case 0x68: // mc68K Windows
if (magic[1] == 0x02)
return COFF_FileType;
break;
default:
break;
}
return Unknown_FileType;
}
bool
Path::isArchive() const {
if (canRead())
return hasMagicNumber("!<arch>\012");
return false;
}
bool
Path::isDynamicLibrary() const {
if (canRead()) {
std::string Magic;
if (getMagicNumber(Magic, 64))
switch (IdentifyFileType(Magic.c_str(), Magic.length())) {
default: return false;
case Mach_O_FixedVirtualMemorySharedLib_FileType:
case Mach_O_DynamicallyLinkedSharedLib_FileType:
case Mach_O_DynamicallyLinkedSharedLibStub_FileType:
case ELF_SharedObject_FileType:
case COFF_FileType: return true;
}
}
return false;
}
Path
Path::FindLibrary(std::string& name) {
std::vector<sys::Path> LibPaths;
GetSystemLibraryPaths(LibPaths);
for (unsigned i = 0; i < LibPaths.size(); ++i) {
sys::Path FullPath(LibPaths[i]);
FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT);
if (FullPath.isDynamicLibrary())
return FullPath;
FullPath.eraseSuffix();
FullPath.appendSuffix("a");
if (FullPath.isArchive())
return FullPath;
}
return sys::Path();
}
std::string Path::GetDLLSuffix() {
return LTDL_SHLIB_EXT;
}
bool
Path::isBytecodeFile() const {
std::string actualMagic;
if (!getMagicNumber(actualMagic, 4))
return false;
return actualMagic == "llvc" || actualMagic == "llvm";
}
bool
Path::isBitcodeFile() const {
std::string actualMagic;
if (!getMagicNumber(actualMagic, 4))
return false;
return actualMagic == "BC\xC0\xDE";
}
bool Path::hasMagicNumber(const std::string &Magic) const {
std::string actualMagic;
if (getMagicNumber(actualMagic, Magic.size()))
return Magic == actualMagic;
return false;
}
// Include the truly platform-specific parts of this class.
#if defined(LLVM_ON_UNIX)
#include "Unix/Path.inc"
#endif
#if defined(LLVM_ON_WIN32)
#include "Win32/Path.inc"
#endif
DEFINING_FILE_FOR(SystemPath)
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