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/Support/SystemUtils.h"
26 #include "llvm/Support/IRReader.h"
27 #include "llvm/System/Signals.h"
28 #include "llvm/System/Path.h"
32 static cl::list<std::string>
33 InputFilenames(cl::Positional, cl::OneOrMore,
34 cl::desc("<input bitcode files>"));
36 static cl::opt<std::string>
37 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
38 cl::value_desc("filename"));
41 Force("f", cl::desc("Enable binary output on terminals"));
45 cl::desc("Write output as LLVM assembly"), cl::Hidden);
48 Verbose("v", cl::desc("Print information about actions taken"));
51 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
53 // LoadFile - Read the specified bitcode file in and return it. This routine
54 // searches the link path for the specified file to try to find it...
56 static inline std::auto_ptr<Module> LoadFile(const char *argv0,
57 const std::string &FN,
58 LLVMContext& Context) {
60 if (!Filename.set(FN)) {
61 errs() << "Invalid file name: '" << FN << "'\n";
62 return std::auto_ptr<Module>();
66 if (Filename.exists()) {
67 if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
70 const std::string &FNStr = Filename.str();
71 Result = ParseIRFile(FNStr, Err, Context);
72 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
75 Err.Print(argv0, errs());
77 errs() << "Bitcode file: '" << Filename.c_str() << "' does not exist.\n";
80 return std::auto_ptr<Module>();
83 int main(int argc, char **argv) {
84 // Print a stack trace if we signal out.
85 sys::PrintStackTraceOnErrorSignal();
86 PrettyStackTraceProgram X(argc, argv);
88 LLVMContext &Context = getGlobalContext();
89 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
90 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
93 std::string ErrorMessage;
95 std::auto_ptr<Module> Composite(LoadFile(argv[0],
96 InputFilenames[BaseArg], Context));
97 if (Composite.get() == 0) {
98 errs() << argv[0] << ": error loading file '"
99 << InputFilenames[BaseArg] << "'\n";
103 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
104 std::auto_ptr<Module> M(LoadFile(argv[0],
105 InputFilenames[i], Context));
107 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
111 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
113 if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
114 errs() << argv[0] << ": link error in '" << InputFilenames[i]
115 << "': " << ErrorMessage << "\n";
120 // TODO: Iterate over the -l list and link in any modules containing
121 // global symbols that have not been resolved so far.
123 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
125 std::string ErrorInfo;
126 std::auto_ptr<raw_ostream>
127 Out(new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
128 raw_fd_ostream::F_Binary));
129 if (!ErrorInfo.empty()) {
130 errs() << ErrorInfo << '\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)) {
140 errs() << argv[0] << ": linked module is broken!\n";
144 if (Verbose) errs() << "Writing bitcode...\n";
145 if (OutputAssembly) {
147 } else if (Force || !CheckBitcodeOutputToConsole(*Out, true))
148 WriteBitcodeToFile(Composite.get(), *Out);