1 //===- llvm-link.cpp - Low-level LLVM linker ------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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 bytecode 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 static cl::opt<bool> NoCompress("disable-compression", cl::init(true),
46 cl::desc("Don't compress the generated bytecode"));
48 // LoadFile - Read the specified bytecode file in and return it. This routine
49 // searches the link path for the specified file to try to find it...
51 static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
53 if (!Filename.set(FN)) {
54 cerr << "Invalid file name: '" << FN << "'\n";
55 return std::auto_ptr<Module>();
58 std::string ErrorMessage;
59 if (Filename.exists()) {
60 if (Verbose) cerr << "Loading '" << Filename.c_str() << "'\n";
63 const std::string &FNStr = Filename.toString();
64 MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(&FNStr[0],
67 ErrorMessage = "Error reading file '" + FNStr + "'";
69 Result = ParseBitcodeFile(Buffer, &ErrorMessage);
71 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
74 cerr << "Error opening bytecode file: '" << Filename.c_str() << "'";
75 if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
79 cerr << "Bytecode file: '" << Filename.c_str() << "' does not exist.\n";
82 return std::auto_ptr<Module>();
85 int main(int argc, char **argv) {
86 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
87 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
88 sys::PrintStackTraceOnErrorSignal();
89 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
92 std::string ErrorMessage;
94 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
95 if (Composite.get() == 0) {
96 cerr << 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]));
104 cerr << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
108 if (Verbose) cerr << "Linking in '" << InputFilenames[i] << "'\n";
110 if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
111 cerr << 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) cerr << "Here's the assembly:\n" << *Composite.get();
122 // FIXME: cout is not binary!
123 std::ostream *Out = &std::cout; // Default to printing to stdout...
124 if (OutputFilename != "-") {
125 if (!Force && std::ifstream(OutputFilename.c_str())) {
126 // If force is not specified, make sure not to overwrite a file!
127 cerr << argv[0] << ": error opening '" << OutputFilename
128 << "': file exists!\n"
129 << "Use -f command line argument to force output\n";
132 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
134 Out = new std::ofstream(OutputFilename.c_str(), io_mode);
136 cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
140 // Make sure that the Out file gets unlinked from the disk if we get a
142 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
145 if (verifyModule(*Composite.get())) {
146 cerr << argv[0] << ": linked module is broken!\n";
150 if (Verbose) cerr << "Writing bytecode...\n";
151 WriteBitcodeToFile(Composite.get(), *Out);
153 if (Out != &std::cout) delete Out;