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//===- lib/Linker/Linker.cpp - Basic Linker functionality ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains basic Linker functionality that all usages will need.
//
//===----------------------------------------------------------------------===//
#include "llvm/Linker.h"
#include "llvm/Module.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Config/config.h"
#include "llvm/Support/system_error.h"
using namespace llvm;
Linker::Linker(StringRef progname, StringRef modname,
LLVMContext& C, unsigned flags):
Context(C),
Composite(new Module(modname, C)),
LibPaths(),
Flags(flags),
Error(),
ProgramName(progname) { }
Linker::Linker(StringRef progname, Module* aModule, unsigned flags) :
Context(aModule->getContext()),
Composite(aModule),
LibPaths(),
Flags(flags),
Error(),
ProgramName(progname) { }
Linker::~Linker() {
delete Composite;
}
bool
Linker::error(StringRef message) {
Error = message;
if (!(Flags&QuietErrors))
errs() << ProgramName << ": error: " << message << "\n";
return true;
}
bool
Linker::warning(StringRef message) {
Error = message;
if (!(Flags&QuietWarnings))
errs() << ProgramName << ": warning: " << message << "\n";
return false;
}
void
Linker::verbose(StringRef message) {
if (Flags&Verbose)
errs() << " " << message << "\n";
}
void
Linker::addPath(const sys::Path& path) {
LibPaths.push_back(path);
}
void
Linker::addPaths(const std::vector<std::string>& paths) {
for (unsigned i = 0, e = paths.size(); i != e; ++i)
LibPaths.push_back(sys::Path(paths[i]));
}
void
Linker::addSystemPaths() {
sys::Path::GetBitcodeLibraryPaths(LibPaths);
LibPaths.insert(LibPaths.begin(),sys::Path("./"));
}
Module*
Linker::releaseModule() {
Module* result = Composite;
LibPaths.clear();
Error.clear();
Composite = 0;
Flags = 0;
return result;
}
// LoadObject - Read in and parse the bitcode file named by FN and return the
// module it contains (wrapped in an auto_ptr), or auto_ptr<Module>() and set
// Error if an error occurs.
std::auto_ptr<Module>
Linker::LoadObject(const sys::Path &FN) {
std::string ParseErrorMessage;
Module *Result = 0;
OwningPtr<MemoryBuffer> Buffer;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(FN.c_str(), Buffer))
ParseErrorMessage = "Error reading file '" + FN.str() + "'" + ": "
+ ec.message();
else
Result = ParseBitcodeFile(Buffer.get(), Context, &ParseErrorMessage);
if (Result)
return std::auto_ptr<Module>(Result);
Error = "Bitcode file '" + FN.str() + "' could not be loaded";
if (ParseErrorMessage.size())
Error += ": " + ParseErrorMessage;
return std::auto_ptr<Module>();
}
// IsLibrary - Determine if "Name" is a library in "Directory". Return
// a non-empty sys::Path if its found, an empty one otherwise.
static inline sys::Path IsLibrary(StringRef Name,
const sys::Path &Directory) {
sys::Path FullPath(Directory);
// Try the libX.a form
FullPath.appendComponent(("lib" + Name).str());
FullPath.appendSuffix("a");
if (FullPath.isArchive())
return FullPath;
// Try the libX.bca form
FullPath.eraseSuffix();
FullPath.appendSuffix("bca");
if (FullPath.isArchive())
return FullPath;
// Try the libX.so (or .dylib) form
FullPath.eraseSuffix();
FullPath.appendSuffix(sys::Path::GetDLLSuffix());
if (FullPath.isDynamicLibrary()) // Native shared library?
return FullPath;
if (FullPath.isBitcodeFile()) // .so file containing bitcode?
return FullPath;
// Try libX form, to make it possible to add dependency on the
// specific version of .so, like liblzma.so.1.0.0
FullPath.eraseSuffix();
if (FullPath.isDynamicLibrary()) // Native shared library?
return FullPath;
if (FullPath.isBitcodeFile()) // .so file containing bitcode?
return FullPath;
// Not found .. fall through
// Indicate that the library was not found in the directory.
FullPath.clear();
return FullPath;
}
/// FindLib - Try to convert Filename into the name of a file that we can open,
/// if it does not already name a file we can open, by first trying to open
/// Filename, then libFilename.[suffix] for each of a set of several common
/// library suffixes, in each of the directories in LibPaths. Returns an empty
/// Path if no matching file can be found.
///
sys::Path
Linker::FindLib(StringRef Filename) {
// Determine if the pathname can be found as it stands.
sys::Path FilePath(Filename);
if (FilePath.canRead() &&
(FilePath.isArchive() || FilePath.isDynamicLibrary()))
return FilePath;
// Iterate over the directories in Paths to see if we can find the library
// there.
for (unsigned Index = 0; Index != LibPaths.size(); ++Index) {
sys::Path Directory(LibPaths[Index]);
sys::Path FullPath = IsLibrary(Filename, Directory);
if (!FullPath.isEmpty())
return FullPath;
}
return sys::Path();
}
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