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/Module.h"
16 #include "llvm/Analysis/Verifier.h"
17 #include "llvm/Bytecode/Reader.h"
18 #include "llvm/Bytecode/Writer.h"
19 #include "llvm/Support/Linker.h"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/System/Signals.h"
22 #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 // LoadFile - Read the specified bytecode 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_file(FN)) {
51 std::cerr << "Invalid file name: '" << FN << "'\n";
52 return std::auto_ptr<Module>();
55 std::string ErrorMessage;
56 if (Filename.exists()) {
57 if (Verbose) std::cerr << "Loading '" << Filename.c_str() << "'\n";
58 Module* Result = ParseBytecodeFile(Filename.get(), &ErrorMessage);
59 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
62 std::cerr << "Error opening bytecode file: '" << Filename.c_str() << "'";
63 if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
67 std::cerr << "Bytecode file: '" << Filename.c_str()
68 << "' does not exist.\n";
71 return std::auto_ptr<Module>();
74 int main(int argc, char **argv) {
75 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
76 sys::PrintStackTraceOnErrorSignal();
77 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
80 std::string ErrorMessage;
82 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
83 if (Composite.get() == 0) {
84 std::cerr << argv[0] << ": error loading file '"
85 << InputFilenames[BaseArg] << "'\n";
89 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
90 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
92 std::cerr << argv[0] << ": error loading file '"
93 << InputFilenames[i] << "'\n";
97 if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
99 if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
100 std::cerr << argv[0] << ": link error in '" << InputFilenames[i]
101 << "': " << ErrorMessage << "\n";
106 // TODO: Iterate over the -l list and link in any modules containing
107 // global symbols that have not been resolved so far.
109 if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
111 std::ostream *Out = &std::cout; // Default to printing to stdout...
112 if (OutputFilename != "-") {
113 if (!Force && std::ifstream(OutputFilename.c_str())) {
114 // If force is not specified, make sure not to overwrite a file!
115 std::cerr << argv[0] << ": error opening '" << OutputFilename
116 << "': file exists!\n"
117 << "Use -f command line argument to force output\n";
120 Out = new std::ofstream(OutputFilename.c_str());
122 std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
126 // Make sure that the Out file gets unlinked from the disk if we get a
128 sys::RemoveFileOnSignal(OutputFilename);
131 if (verifyModule(*Composite.get())) {
132 std::cerr << argv[0] << ": linked module is broken!\n";
136 if (Verbose) std::cerr << "Writing bytecode...\n";
137 WriteBytecodeToFile(Composite.get(), *Out);
139 if (Out != &std::cout) delete Out;