1 //===- lib/Linker/Linker.cpp - Basic Linker functionality ----------------===//
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 file contains basic Linker functionality that all usages will need.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Linker.h"
15 #include "llvm/Module.h"
16 #include "llvm/Bitcode/ReaderWriter.h"
17 #include "llvm/System/Path.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/MemoryBuffer.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include "llvm/Config/config.h"
24 Linker::Linker(StringRef progname, StringRef modname,
25 LLVMContext& C, unsigned flags):
27 Composite(new Module(modname, C)),
31 ProgramName(progname) { }
33 Linker::Linker(StringRef progname, Module* aModule, unsigned flags) :
34 Context(aModule->getContext()),
39 ProgramName(progname) { }
46 Linker::error(StringRef message) {
48 if (!(Flags&QuietErrors))
49 errs() << ProgramName << ": error: " << message << "\n";
54 Linker::warning(StringRef message) {
56 if (!(Flags&QuietWarnings))
57 errs() << ProgramName << ": warning: " << message << "\n";
62 Linker::verbose(StringRef message) {
64 dbgs() << " " << message << "\n";
68 Linker::addPath(const sys::Path& path) {
69 LibPaths.push_back(path);
73 Linker::addPaths(const std::vector<std::string>& paths) {
74 for (unsigned i = 0, e = paths.size(); i != e; ++i)
75 LibPaths.push_back(sys::Path(paths[i]));
79 Linker::addSystemPaths() {
80 sys::Path::GetBitcodeLibraryPaths(LibPaths);
81 LibPaths.insert(LibPaths.begin(),sys::Path("./"));
85 Linker::releaseModule() {
86 Module* result = Composite;
94 // LoadObject - Read in and parse the bitcode file named by FN and return the
95 // module it contains (wrapped in an auto_ptr), or auto_ptr<Module>() and set
96 // Error if an error occurs.
98 Linker::LoadObject(const sys::Path &FN) {
99 std::string ParseErrorMessage;
102 std::auto_ptr<MemoryBuffer> Buffer(MemoryBuffer::getFileOrSTDIN(FN.c_str()));
104 Result = ParseBitcodeFile(Buffer.get(), Context, &ParseErrorMessage);
106 ParseErrorMessage = "Error reading file '" + FN.str() + "'";
109 return std::auto_ptr<Module>(Result);
110 Error = "Bitcode file '" + FN.str() + "' could not be loaded";
111 if (ParseErrorMessage.size())
112 Error += ": " + ParseErrorMessage;
113 return std::auto_ptr<Module>();
116 // IsLibrary - Determine if "Name" is a library in "Directory". Return
117 // a non-empty sys::Path if its found, an empty one otherwise.
118 static inline sys::Path IsLibrary(StringRef Name,
119 const sys::Path &Directory) {
121 sys::Path FullPath(Directory);
123 // Try the libX.a form
124 FullPath.appendComponent(("lib" + Name).str());
125 FullPath.appendSuffix("a");
126 if (FullPath.isArchive())
129 // Try the libX.bca form
130 FullPath.eraseSuffix();
131 FullPath.appendSuffix("bca");
132 if (FullPath.isArchive())
135 // Try the libX.so (or .dylib) form
136 FullPath.eraseSuffix();
137 FullPath.appendSuffix(&(LTDL_SHLIB_EXT[1]));
138 if (FullPath.isDynamicLibrary()) // Native shared library?
140 if (FullPath.isBitcodeFile()) // .so file containing bitcode?
143 // Not found .. fall through
145 // Indicate that the library was not found in the directory.
150 /// FindLib - Try to convert Filename into the name of a file that we can open,
151 /// if it does not already name a file we can open, by first trying to open
152 /// Filename, then libFilename.[suffix] for each of a set of several common
153 /// library suffixes, in each of the directories in LibPaths. Returns an empty
154 /// Path if no matching file can be found.
157 Linker::FindLib(StringRef Filename) {
158 // Determine if the pathname can be found as it stands.
159 sys::Path FilePath(Filename);
160 if (FilePath.canRead() &&
161 (FilePath.isArchive() || FilePath.isDynamicLibrary()))
164 // Iterate over the directories in Paths to see if we can find the library
166 for (unsigned Index = 0; Index != LibPaths.size(); ++Index) {
167 sys::Path Directory(LibPaths[Index]);
168 sys::Path FullPath = IsLibrary(Filename, Directory);
169 if (!FullPath.isEmpty())