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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/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/IRReader.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/ToolOutputFile.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("Enable binary output on terminals"));
static cl::opt<bool>
OutputAssembly("S",
cl::desc("Write output as LLVM assembly"), cl::Hidden);
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 char *argv0,
const std::string &FN,
LLVMContext& Context) {
sys::Path Filename;
if (!Filename.set(FN)) {
errs() << "Invalid file name: '" << FN << "'\n";
return std::auto_ptr<Module>();
}
SMDiagnostic Err;
if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
Module* Result = 0;
const std::string &FNStr = Filename.str();
Result = ParseIRFile(FNStr, Err, Context);
if (Result) return std::auto_ptr<Module>(Result); // Load successful!
Err.print(argv0, errs());
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(argv[0],
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(argv[0],
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(), Linker::DestroySource,
&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;
std::string ErrorInfo;
tool_output_file Out(OutputFilename.c_str(), ErrorInfo,
raw_fd_ostream::F_Binary);
if (!ErrorInfo.empty()) {
errs() << ErrorInfo << '\n';
return 1;
}
if (verifyModule(*Composite)) {
errs() << argv[0] << ": linked module is broken!\n";
return 1;
}
if (Verbose) errs() << "Writing bitcode...\n";
if (OutputAssembly) {
Out.os() << *Composite;
} else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true))
WriteBitcodeToFile(Composite.get(), Out.os());
// Declare success.
Out.keep();
return 0;
}
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