llvm-6502/lib/Linker/Linker.cpp
Chandler Carruth 0b8c9a80f2 Move all of the header files which are involved in modelling the LLVM IR
into their new header subdirectory: include/llvm/IR. This matches the
directory structure of lib, and begins to correct a long standing point
of file layout clutter in LLVM.

There are still more header files to move here, but I wanted to handle
them in separate commits to make tracking what files make sense at each
layer easier.

The only really questionable files here are the target intrinsic
tablegen files. But that's a battle I'd rather not fight today.

I've updated both CMake and Makefile build systems (I think, and my
tests think, but I may have missed something).

I've also re-sorted the includes throughout the project. I'll be
committing updates to Clang, DragonEgg, and Polly momentarily.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171366 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-02 11:36:10 +00:00

182 lines
5.2 KiB
C++

//===- 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/Bitcode/ReaderWriter.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.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();
}