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134 lines
4.3 KiB
C++
134 lines
4.3 KiB
C++
//===- llvm-link.cpp - Low-level LLVM linker ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility may be invoked in the following manner:
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// llvm-link a.bc b.bc c.bc -o x.bc
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/Analysis/Verifier.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/Support/Linker.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/System/Signals.h"
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#include "llvm/System/Path.h"
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#include <fstream>
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#include <iostream>
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#include <memory>
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using namespace llvm;
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static cl::list<std::string>
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InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bytecode files>"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
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cl::value_desc("filename"));
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static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
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static cl::opt<bool>
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Verbose("v", cl::desc("Print information about actions taken"));
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static cl::opt<bool>
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DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
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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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sys::Path Filename;
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if (!Filename.set_file(FN)) {
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std::cerr << "Invalid file name: '" << FN << "'\n";
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return std::auto_ptr<Module>();
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}
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std::string ErrorMessage;
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if (Filename.exists()) {
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if (Verbose) std::cerr << "Loading '" << Filename.c_str() << "'\n";
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Module* Result = ParseBytecodeFile(Filename.get(), &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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std::cerr << "Error opening bytecode file: '" << Filename.c_str() << "'";
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if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
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std::cerr << "\n";
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}
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} else {
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std::cerr << "Bytecode file: '" << Filename.c_str()
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<< "' does not exist.\n";
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}
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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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sys::PrintStackTraceOnErrorSignal();
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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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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) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
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if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
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std::cerr << argv[0] << ": link error in '" << InputFilenames[i]
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<< "': " << ErrorMessage << "\n";
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return 1;
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}
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}
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// TODO: Iterate over the -l list and link in any modules containing
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// global symbols that have not been resolved so far.
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if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
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std::ostream *Out = &std::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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std::cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': 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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std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
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return 1;
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}
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// Make sure that the Out file gets unlinked from the disk if we get a
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// SIGINT
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sys::RemoveFileOnSignal(OutputFilename);
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}
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if (verifyModule(*Composite.get())) {
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std::cerr << argv[0] << ": linked module is broken!\n";
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return 1;
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}
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if (Verbose) std::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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