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134 lines
4.3 KiB
C++
134 lines
4.3 KiB
C++
//===----------------------------------------------------------------------===//
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// LLVM 'LINK' UTILITY
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//
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// This utility may be invoked in the following manner:
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// link a.bc b.bc c.bc -o x.bc
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//
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// Alternatively, this can be used as an 'ar' tool as well. If invoked as
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// either 'ar' or 'llvm-ar', it accepts a 'rc' parameter as well.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Linker.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/Writer.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Module.h"
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#include "llvm/Method.h"
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#include "Support/CommandLine.h"
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#include <fstream>
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#include <memory>
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#include <sys/types.h> // For FileExists
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typedef int blksize_t; // SYS/TYPES is broken!!!
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#include <sys/stat.h>
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cl::StringList InputFilenames("", "Load <arg> files, linking them together",
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cl::OneOrMore);
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cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "-");
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cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
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cl::Flag Verbose ("v", "Print information about actions taken");
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cl::Flag DumpAsm ("d", "Print assembly as linked", cl::Hidden, false);
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cl::StringList LibPaths ("L", "Specify a library search path", cl::ZeroOrMore);
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// FileExists - Return true if the specified string is an openable file...
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static inline bool FileExists(const std::string &FN) {
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struct stat StatBuf;
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return stat(FN.c_str(), &StatBuf) != -1;
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}
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// LoadFile - Read the specified bytecode file in and return it. This routine
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// searches the link path for the specified file to try to find it...
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//
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static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
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std::string Filename = FN;
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std::string ErrorMessage;
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unsigned NextLibPathIdx = 0;
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bool FoundAFile = false;
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while (1) {
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if (Verbose) cerr << "Loading '" << Filename << "'\n";
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if (FileExists(Filename)) FoundAFile = true;
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Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
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if (Result) return std::auto_ptr<Module>(Result); // Load successful!
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if (Verbose) {
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cerr << "Error opening bytecode file: '" << Filename << "'";
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if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
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cerr << endl;
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}
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if (NextLibPathIdx == LibPaths.size()) break;
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Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
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}
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if (FoundAFile)
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cerr << "Bytecode file '" << FN << "' corrupt! "
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<< "Use 'link -v ...' for more info.\n";
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else
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cerr << "Could not locate bytecode file: '" << FN << "'\n";
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return std::auto_ptr<Module>();
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}
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm linker\n",
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cl::EnableSingleLetterArgValue |
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cl::DisableSingleLetterArgGrouping);
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assert(InputFilenames.size() > 0 && "OneOrMore is not working");
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unsigned BaseArg = 0;
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std::string ErrorMessage;
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// TODO: TEST argv[0] for llvm-ar forms... for now, this is a huge hack.
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if (InputFilenames.size() >= 3 && InputFilenames[0] == "rc" &&
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OutputFilename == "-") {
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BaseArg = 2;
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OutputFilename = InputFilenames[1];
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}
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std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
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if (Composite.get() == 0) return 1;
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for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
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std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
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if (M.get() == 0) return 1;
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if (Verbose) cerr << "Linking in '" << InputFilenames[i] << "'\n";
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if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
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cerr << "Error linking in '" << InputFilenames[i] << "': "
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<< ErrorMessage << endl;
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return 1;
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}
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}
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if (DumpAsm)
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cerr << "Here's the assembly:\n" << Composite.get();
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ostream *Out = &cout; // Default to printing to stdout...
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if (OutputFilename != "-") {
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if (!Force && !std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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cerr << "Error opening '" << OutputFilename << "': File exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good()) {
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cerr << "Error opening '" << OutputFilename << "'!\n";
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return 1;
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}
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}
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if (Verbose) cerr << "Writing bytecode...\n";
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WriteBytecodeToFile(Composite.get(), *Out);
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if (Out != &std::cout) delete Out;
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return 0;
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}
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