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//===- llvm-link.cpp - Low-level LLVM linker ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility may be invoked in the following manner:
// llvm-link a.bc b.bc c.bc -o x.bc
//
//===----------------------------------------------------------------------===//
#include "llvm/Linker.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/System/Signals.h"
#include "llvm/System/Path.h"
#include <memory>
using namespace llvm;
static cl::list<std::string>
InputFilenames(cl::Positional, cl::OneOrMore,
cl::desc("<input bitcode files>"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
cl::value_desc("filename"));
static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
Verbose("v", cl::desc("Print information about actions taken"));
static cl::opt<bool>
DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
// LoadFile - Read the specified bitcode file in and return it. This routine
// searches the link path for the specified file to try to find it...
//
static inline std::auto_ptr<Module> LoadFile(const std::string &FN,
LLVMContext& Context) {
sys::Path Filename;
if (!Filename.set(FN)) {
errs() << "Invalid file name: '" << FN << "'\n";
return std::auto_ptr<Module>();
}
std::string ErrorMessage;
if (Filename.exists()) {
if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
Module* Result = 0;
const std::string &FNStr = Filename.toString();
if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(FNStr,
&ErrorMessage)) {
Result = ParseBitcodeFile(Buffer, Context, &ErrorMessage);
delete Buffer;
}
if (Result) return std::auto_ptr<Module>(Result); // Load successful!
if (Verbose) {
errs() << "Error opening bitcode file: '" << Filename.c_str() << "'";
if (ErrorMessage.size()) errs() << ": " << ErrorMessage;
errs() << "\n";
}
} else {
errs() << "Bitcode file: '" << Filename.c_str() << "' does not exist.\n";
}
return std::auto_ptr<Module>();
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
unsigned BaseArg = 0;
std::string ErrorMessage;
std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg], Context));
if (Composite.get() == 0) {
errs() << argv[0] << ": error loading file '"
<< InputFilenames[BaseArg] << "'\n";
return 1;
}
for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
std::auto_ptr<Module> M(LoadFile(InputFilenames[i], Context));
if (M.get() == 0) {
errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
return 1;
}
if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
errs() << argv[0] << ": link error in '" << InputFilenames[i]
<< "': " << ErrorMessage << "\n";
return 1;
}
}
// TODO: Iterate over the -l list and link in any modules containing
// global symbols that have not been resolved so far.
if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite.get();
// FIXME: outs() is not binary!
raw_ostream *Out = &outs(); // Default to printing to stdout...
if (OutputFilename != "-") {
std::string ErrorInfo;
Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true,
Force, ErrorInfo);
if (!ErrorInfo.empty()) {
errs() << ErrorInfo << '\n';
if (!Force)
errs() << "Use -f command line argument to force output\n";
delete Out;
return 1;
}
// Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
if (verifyModule(*Composite.get())) {
errs() << argv[0] << ": linked module is broken!\n";
return 1;
}
if (Verbose) errs() << "Writing bitcode...\n";
WriteBitcodeToFile(Composite.get(), *Out);
if (Out != &outs()) delete Out;
return 0;
}
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