1 //===- llvm-link.cpp - Low-level LLVM linker ------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This utility may be invoked in the following manner:
11 // llvm-link a.bc b.bc c.bc -o x.bc
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Linker.h"
16 #include "llvm/LLVMContext.h"
17 #include "llvm/Module.h"
18 #include "llvm/Analysis/Verifier.h"
19 #include "llvm/Bitcode/ReaderWriter.h"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/Support/ManagedStatic.h"
22 #include "llvm/Support/MemoryBuffer.h"
23 #include "llvm/Support/PrettyStackTrace.h"
24 #include "llvm/System/Signals.h"
25 #include "llvm/System/Path.h"
29 static cl::list<std::string>
30 InputFilenames(cl::Positional, cl::OneOrMore,
31 cl::desc("<input bitcode files>"));
33 static cl::opt<std::string>
34 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
35 cl::value_desc("filename"));
37 static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
40 Verbose("v", cl::desc("Print information about actions taken"));
43 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
45 // LoadFile - Read the specified bitcode file in and return it. This routine
46 // searches the link path for the specified file to try to find it...
48 static inline std::auto_ptr<Module> LoadFile(const std::string &FN,
49 LLVMContext& Context) {
51 if (!Filename.set(FN)) {
52 errs() << "Invalid file name: '" << FN << "'\n";
53 return std::auto_ptr<Module>();
56 std::string ErrorMessage;
57 if (Filename.exists()) {
58 if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
61 const std::string &FNStr = Filename.toString();
62 if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(FNStr,
64 Result = ParseBitcodeFile(Buffer, Context, &ErrorMessage);
67 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
70 errs() << "Error opening bitcode file: '" << Filename.c_str() << "'";
71 if (ErrorMessage.size()) errs() << ": " << ErrorMessage;
75 errs() << "Bitcode file: '" << Filename.c_str() << "' does not exist.\n";
78 return std::auto_ptr<Module>();
81 int main(int argc, char **argv) {
82 // Print a stack trace if we signal out.
83 sys::PrintStackTraceOnErrorSignal();
84 PrettyStackTraceProgram X(argc, argv);
86 LLVMContext &Context = getGlobalContext();
87 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
88 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
91 std::string ErrorMessage;
93 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg], Context));
94 if (Composite.get() == 0) {
95 errs() << argv[0] << ": error loading file '"
96 << InputFilenames[BaseArg] << "'\n";
100 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
101 std::auto_ptr<Module> M(LoadFile(InputFilenames[i], Context));
103 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
107 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
109 if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
110 errs() << argv[0] << ": link error in '" << InputFilenames[i]
111 << "': " << ErrorMessage << "\n";
116 // TODO: Iterate over the -l list and link in any modules containing
117 // global symbols that have not been resolved so far.
119 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite.get();
121 // FIXME: outs() is not binary!
122 raw_ostream *Out = &outs(); // Default to printing to stdout...
123 if (OutputFilename != "-") {
124 std::string ErrorInfo;
125 Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true,
127 if (!ErrorInfo.empty()) {
128 errs() << ErrorInfo << '\n';
130 errs() << "Use -f command line argument to force output\n";
135 // Make sure that the Out file gets unlinked from the disk if we get a
137 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
140 if (verifyModule(*Composite.get())) {
141 errs() << argv[0] << ": linked module is broken!\n";
145 if (Verbose) errs() << "Writing bitcode...\n";
146 WriteBitcodeToFile(Composite.get(), *Out);
148 if (Out != &outs()) delete Out;