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/PrettyStackTrace.h"
23 #include "llvm/Support/raw_ostream.h"
24 #include "llvm/Support/SystemUtils.h"
25 #include "llvm/Support/IRReader.h"
26 #include "llvm/System/Signals.h"
27 #include "llvm/System/Path.h"
31 static cl::list<std::string>
32 InputFilenames(cl::Positional, cl::OneOrMore,
33 cl::desc("<input bitcode files>"));
35 static cl::opt<std::string>
36 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
37 cl::value_desc("filename"));
40 Force("f", cl::desc("Enable binary output on terminals"));
44 cl::desc("Write output as LLVM assembly"), cl::Hidden);
47 Verbose("v", cl::desc("Print information about actions taken"));
50 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
52 // LoadFile - Read the specified bitcode file in and return it. This routine
53 // searches the link path for the specified file to try to find it...
55 static inline std::auto_ptr<Module> LoadFile(const char *argv0,
56 const std::string &FN,
57 LLVMContext& Context) {
59 if (!Filename.set(FN)) {
60 errs() << "Invalid file name: '" << FN << "'\n";
61 return std::auto_ptr<Module>();
65 if (Filename.exists()) {
66 if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
69 const std::string &FNStr = Filename.str();
70 Result = ParseIRFile(FNStr, Err, Context);
71 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
74 Err.Print(argv0, errs());
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(argv[0],
95 InputFilenames[BaseArg], Context));
96 if (Composite.get() == 0) {
97 errs() << argv[0] << ": error loading file '"
98 << InputFilenames[BaseArg] << "'\n";
102 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
103 std::auto_ptr<Module> M(LoadFile(argv[0],
104 InputFilenames[i], Context));
106 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
110 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
112 if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
113 errs() << argv[0] << ": link error in '" << InputFilenames[i]
114 << "': " << ErrorMessage << "\n";
119 // TODO: Iterate over the -l list and link in any modules containing
120 // global symbols that have not been resolved so far.
122 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
124 std::string ErrorInfo;
125 std::auto_ptr<raw_ostream>
126 Out(new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
127 raw_fd_ostream::F_Binary));
128 if (!ErrorInfo.empty()) {
129 errs() << ErrorInfo << '\n';
133 // Make sure that the Out file gets unlinked from the disk if we get a
135 if (OutputFilename != "-")
136 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
138 if (verifyModule(*Composite)) {
139 errs() << argv[0] << ": linked module is broken!\n";
143 if (Verbose) errs() << "Writing bitcode...\n";
144 if (OutputAssembly) {
146 } else if (Force || !CheckBitcodeOutputToConsole(*Out, true))
147 WriteBitcodeToFile(Composite.get(), *Out);