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/Support/raw_ostream.h"
25 #include "llvm/System/Signals.h"
26 #include "llvm/System/Path.h"
30 static cl::list<std::string>
31 InputFilenames(cl::Positional, cl::OneOrMore,
32 cl::desc("<input bitcode files>"));
34 static cl::opt<std::string>
35 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
36 cl::value_desc("filename"));
38 static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
41 Verbose("v", cl::desc("Print information about actions taken"));
44 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
46 // LoadFile - Read the specified bitcode file in and return it. This routine
47 // searches the link path for the specified file to try to find it...
49 static inline std::auto_ptr<Module> LoadFile(const std::string &FN,
50 LLVMContext& Context) {
52 if (!Filename.set(FN)) {
53 errs() << "Invalid file name: '" << FN << "'\n";
54 return std::auto_ptr<Module>();
57 std::string ErrorMessage;
58 if (Filename.exists()) {
59 if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
62 const std::string &FNStr = Filename.str();
63 if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(FNStr,
65 Result = ParseBitcodeFile(Buffer, Context, &ErrorMessage);
68 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
71 errs() << "Error opening bitcode file: '" << Filename.c_str() << "'";
72 if (ErrorMessage.size()) errs() << ": " << ErrorMessage;
76 errs() << "Bitcode file: '" << Filename.c_str() << "' does not exist.\n";
79 return std::auto_ptr<Module>();
82 int main(int argc, char **argv) {
83 // Print a stack trace if we signal out.
84 sys::PrintStackTraceOnErrorSignal();
85 PrettyStackTraceProgram X(argc, argv);
87 LLVMContext &Context = getGlobalContext();
88 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
89 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
92 std::string ErrorMessage;
94 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg], Context));
95 if (Composite.get() == 0) {
96 errs() << argv[0] << ": error loading file '"
97 << InputFilenames[BaseArg] << "'\n";
101 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
102 std::auto_ptr<Module> M(LoadFile(InputFilenames[i], Context));
104 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
108 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
110 if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
111 errs() << argv[0] << ": link error in '" << InputFilenames[i]
112 << "': " << ErrorMessage << "\n";
117 // TODO: Iterate over the -l list and link in any modules containing
118 // global symbols that have not been resolved so far.
120 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite.get();
122 std::string ErrorInfo;
123 std::auto_ptr<raw_ostream>
124 Out(new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
125 raw_fd_ostream::F_Binary |
126 (Force ? raw_fd_ostream::F_Force : 0)));
127 if (!ErrorInfo.empty()) {
128 errs() << ErrorInfo << '\n';
130 errs() << "Use -f command line argument to force output\n";
134 // Make sure that the Out file gets unlinked from the disk if we get a
136 if (OutputFilename != "-")
137 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
139 if (verifyModule(*Composite.get())) {
140 errs() << argv[0] << ": linked module is broken!\n";
144 if (Verbose) errs() << "Writing bitcode...\n";
145 WriteBitcodeToFile(Composite.get(), *Out);