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//===- llvm-link.cpp - Low-level LLVM linker ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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/Module.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/Writer.h"
#include "llvm/Support/Linker.h"
#include "Support/CommandLine.h"
#include "Support/FileUtilities.h"
#include "llvm/System/Signals.h"
#include <fstream>
#include <memory>
using namespace llvm;
static cl::list<std::string>
InputFilenames(cl::Positional, cl::OneOrMore,
cl::desc("<input bytecode 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);
static cl::list<std::string>
LibPaths("L", cl::desc("Specify a library search path"), cl::ZeroOrMore,
cl::value_desc("directory"), cl::Prefix);
// LoadFile - Read the specified bytecode 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) {
std::string Filename = FN;
std::string ErrorMessage;
unsigned NextLibPathIdx = 0;
bool FoundAFile = false;
while (1) {
if (Verbose) std::cerr << "Loading '" << Filename << "'\n";
if (getFileSize(Filename) != -1) FoundAFile = true;
Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
if (Result) return std::auto_ptr<Module>(Result); // Load successful!
if (Verbose) {
std::cerr << "Error opening bytecode file: '" << Filename << "'";
if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
std::cerr << "\n";
}
if (NextLibPathIdx == LibPaths.size()) break;
Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
}
if (FoundAFile)
std::cerr << "Bytecode file '" << FN << "' corrupt! "
<< "Use 'llvm-link -v ...' for more info.\n";
else
std::cerr << "Could not locate bytecode file: '" << FN << "'\n";
return std::auto_ptr<Module>();
}
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
PrintStackTraceOnErrorSignal();
assert(InputFilenames.size() > 0 && "OneOrMore is not working");
unsigned BaseArg = 0;
std::string ErrorMessage;
std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
if (Composite.get() == 0) return 1;
for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
if (M.get() == 0) return 1;
if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
std::cerr << argv[0] << ": error linking in '" << InputFilenames[i]
<< "': " << ErrorMessage << "\n";
return 1;
}
}
if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
std::ostream *Out = &std::cout; // Default to printing to stdout...
if (OutputFilename != "-") {
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
std::cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str());
if (!Out->good()) {
std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
return 1;
}
// Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
}
if (verifyModule(*Composite.get())) {
std::cerr << argv[0] << ": linked module is broken!\n";
return 1;
}
if (Verbose) std::cerr << "Writing bytecode...\n";
WriteBytecodeToFile(Composite.get(), *Out);
if (Out != &std::cout) delete Out;
return 0;
}
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