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/Module.h"
17 #include "llvm/Analysis/Verifier.h"
18 #include "llvm/Bitcode/ReaderWriter.h"
19 #include "llvm/Support/CommandLine.h"
20 #include "llvm/Support/ManagedStatic.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/System/Signals.h"
23 #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) {
50 if (!Filename.set(FN)) {
51 cerr << "Invalid file name: '" << FN << "'\n";
52 return std::auto_ptr<Module>();
55 std::string ErrorMessage;
56 if (Filename.exists()) {
57 if (Verbose) cerr << "Loading '" << Filename.c_str() << "'\n";
60 const std::string &FNStr = Filename.toString();
61 if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(FNStr,
63 Result = ParseBitcodeFile(Buffer, &ErrorMessage);
66 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
69 cerr << "Error opening bitcode file: '" << Filename.c_str() << "'";
70 if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
74 cerr << "Bitcode file: '" << Filename.c_str() << "' does not exist.\n";
77 return std::auto_ptr<Module>();
80 int main(int argc, char **argv) {
81 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
82 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
83 sys::PrintStackTraceOnErrorSignal();
84 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
87 std::string ErrorMessage;
89 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
90 if (Composite.get() == 0) {
91 cerr << argv[0] << ": error loading file '"
92 << InputFilenames[BaseArg] << "'\n";
96 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
97 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
99 cerr << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
103 if (Verbose) cerr << "Linking in '" << InputFilenames[i] << "'\n";
105 if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
106 cerr << argv[0] << ": link error in '" << InputFilenames[i]
107 << "': " << ErrorMessage << "\n";
112 // TODO: Iterate over the -l list and link in any modules containing
113 // global symbols that have not been resolved so far.
115 if (DumpAsm) cerr << "Here's the assembly:\n" << *Composite.get();
117 // FIXME: cout is not binary!
118 std::ostream *Out = &std::cout; // Default to printing to stdout...
119 if (OutputFilename != "-") {
120 if (!Force && std::ifstream(OutputFilename.c_str())) {
121 // If force is not specified, make sure not to overwrite a file!
122 cerr << argv[0] << ": error opening '" << OutputFilename
123 << "': file exists!\n"
124 << "Use -f command line argument to force output\n";
127 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
129 Out = new std::ofstream(OutputFilename.c_str(), io_mode);
131 cerr << argv[0] << ": error opening '" << OutputFilename << "'!\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 cerr << argv[0] << ": linked module is broken!\n";
145 if (Verbose) cerr << "Writing bitcode...\n";
146 WriteBitcodeToFile(Composite.get(), *Out);
148 if (Out != &std::cout) delete Out;