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//===----------------------------------------------------------------------===//
// LLVM 'LINK' UTILITY
//
// This utility may be invoked in the following manner:
// link a.bc b.bc c.bc -o x.bc
//
// Alternatively, this can be used as an 'ar' tool as well. If invoked as
// either 'ar' or 'llvm-ar', it accepts a 'rc' parameter as well.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Linker.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/Writer.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/Module.h"
#include "llvm/Method.h"
#include "Support/CommandLine.h"
#include <fstream>
#include <memory>
cl::StringList InputFilenames("", "Load <arg> files, linking them together",
cl::OneOrMore);
cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "-");
cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
cl::Flag Verbose ("v", "Print information about actions taken");
cl::Flag DumpAsm ("d", "Print assembly as linked", cl::Hidden, false);
cl::StringList LibPaths ("L", "Specify a library search path", cl::ZeroOrMore);
static inline std::auto_ptr<Module> LoadFile(const string &FN) {
string Filename = FN;
string ErrorMessage;
unsigned NextLibPathIdx = 0;
while (1) {
if (Verbose) cerr << "Loading '" << Filename << "'\n";
Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
if (Result) return std::auto_ptr<Module>(Result); // Load successful!
if (Verbose) {
cerr << "Error opening bytecode file: '" << Filename << "'";
if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
cerr << endl;
}
if (NextLibPathIdx == LibPaths.size()) break;
Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
}
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",
cl::EnableSingleLetterArgValue |
cl::DisableSingleLetterArgGrouping);
assert(InputFilenames.size() > 0 && "OneOrMore is not working");
unsigned BaseArg = 0;
string ErrorMessage;
// TODO: TEST argv[0] for llvm-ar forms... for now, this is a huge hack.
if (InputFilenames.size() >= 3 && InputFilenames[0] == "rc" &&
OutputFilename == "-") {
BaseArg = 2;
OutputFilename = InputFilenames[1];
}
std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
if (Composite.get() == 0) return 1;
for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
auto_ptr<Module> M(LoadFile(InputFilenames[i]));
if (M.get() == 0) return 1;
if (Verbose) cerr << "Linking in '" << InputFilenames[i] << "'\n";
if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
cerr << "Error linking in '" << InputFilenames[i] << "': "
<< ErrorMessage << endl;
return 1;
}
}
if (DumpAsm)
cerr << "Here's the assembly:\n" << Composite.get();
ostream *Out = &cout; // Default to printing to stdout...
if (OutputFilename != "-") {
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
if (!Out->good()) {
cerr << "Error opening '" << OutputFilename << "'!\n";
return 1;
}
}
if (Verbose) cerr << "Writing bytecode...\n";
WriteBytecodeToFile(Composite.get(), *Out);
if (Out != &cout) delete Out;
return 0;
}
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