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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/Module.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include <fstream>
#include <memory>
#include <sys/types.h> // For FileExists
#include <sys/stat.h>
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);
cl::StringList Libraries ("l", "Specify libraries to link to", cl::ZeroOrMore);
// FileExists - Return true if the specified string is an openable file...
static inline bool FileExists(const std::string &FN) {
struct stat StatBuf;
return stat(FN.c_str(), &StatBuf) != -1;
}
// 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) cerr << "Loading '" << Filename << "'\n";
if (FileExists(Filename)) FoundAFile = true;
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 << "\n";
}
if (NextLibPathIdx == LibPaths.size()) break;
Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
}
if (FoundAFile)
cerr << "Bytecode file '" << FN << "' corrupt! "
<< "Use 'link -v ...' for more info.\n";
else
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;
std::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];
}
if (!Libraries.empty())
cerr << "LLVM Linker Warning: Linking to libraries is unimplemented!\n";
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) cerr << "Linking in '" << InputFilenames[i] << "'\n";
if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
cerr << "Error linking in '" << InputFilenames[i] << "': "
<< ErrorMessage << "\n";
return 1;
}
}
if (DumpAsm) {
cerr << "Here's the assembly:\n";
Composite.get()->dump();
}
ostream *Out = &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!
cerr << "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()) {
cerr << "Error opening '" << OutputFilename << "'!\n";
return 1;
}
// Make sure that the Out file gets unlink'd from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
}
if (Verbose) cerr << "Writing bytecode...\n";
WriteBytecodeToFile(Composite.get(), *Out);
if (Out != &std::cout) delete Out;
return 0;
}
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