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/Analysis/Verifier.h"
17 #include "llvm/Bitcode/ReaderWriter.h"
18 #include "llvm/IR/LLVMContext.h"
19 #include "llvm/IR/Module.h"
20 #include "llvm/IRReader/IRReader.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/ManagedStatic.h"
23 #include "llvm/Support/Path.h"
24 #include "llvm/Support/PrettyStackTrace.h"
25 #include "llvm/Support/Signals.h"
26 #include "llvm/Support/SourceMgr.h"
27 #include "llvm/Support/SystemUtils.h"
28 #include "llvm/Support/ToolOutputFile.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 Module *LoadFile(const char *argv0, const std::string &FN,
57 LLVMContext& Context) {
59 if (!Filename.set(FN)) {
60 errs() << "Invalid file name: '" << FN << "'\n";
65 if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
68 const std::string &FNStr = Filename.str();
69 Result = ParseIRFile(FNStr, Err, Context);
70 if (Result) return Result; // Load successful!
72 Err.print(argv0, errs());
76 int main(int argc, char **argv) {
77 // Print a stack trace if we signal out.
78 sys::PrintStackTraceOnErrorSignal();
79 PrettyStackTraceProgram X(argc, argv);
81 LLVMContext &Context = getGlobalContext();
82 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
83 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
86 std::string ErrorMessage;
88 OwningPtr<Module> Composite(LoadFile(argv[0],
89 InputFilenames[BaseArg], Context));
90 if (Composite.get() == 0) {
91 errs() << argv[0] << ": error loading file '"
92 << InputFilenames[BaseArg] << "'\n";
96 Linker L(Composite.get());
97 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
98 OwningPtr<Module> M(LoadFile(argv[0], InputFilenames[i], Context));
100 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
104 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
106 if (L.linkInModule(M.get(), &ErrorMessage)) {
107 errs() << argv[0] << ": link error in '" << InputFilenames[i]
108 << "': " << ErrorMessage << "\n";
113 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
115 std::string ErrorInfo;
116 tool_output_file Out(OutputFilename.c_str(), ErrorInfo,
117 raw_fd_ostream::F_Binary);
118 if (!ErrorInfo.empty()) {
119 errs() << ErrorInfo << '\n';
123 if (verifyModule(*Composite)) {
124 errs() << argv[0] << ": linked module is broken!\n";
128 if (Verbose) errs() << "Writing bitcode...\n";
129 if (OutputAssembly) {
130 Out.os() << *Composite;
131 } else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true))
132 WriteBitcodeToFile(Composite.get(), Out.os());