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/Transforms/Utils/Linker.h"
20 #include "Support/CommandLine.h"
21 #include "Support/FileUtilities.h"
22 #include "Support/Signals.h"
28 static cl::list<std::string>
29 InputFilenames(cl::Positional, cl::OneOrMore,
30 cl::desc("<input bytecode files>"));
32 static cl::opt<std::string>
33 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
34 cl::value_desc("filename"));
36 static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
39 Verbose("v", cl::desc("Print information about actions taken"));
42 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
44 static cl::list<std::string>
45 LibPaths("L", cl::desc("Specify a library search path"), cl::ZeroOrMore,
46 cl::value_desc("directory"), cl::Prefix);
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) {
52 std::string Filename = FN;
53 std::string ErrorMessage;
55 unsigned NextLibPathIdx = 0;
56 bool FoundAFile = false;
59 if (Verbose) std::cerr << "Loading '" << Filename << "'\n";
60 if (getFileSize(Filename) != -1) FoundAFile = true;
61 Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
62 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
65 std::cerr << "Error opening bytecode file: '" << Filename << "'";
66 if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
70 if (NextLibPathIdx == LibPaths.size()) break;
71 Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
75 std::cerr << "Bytecode file '" << FN << "' corrupt! "
76 << "Use 'llvm-link -v ...' for more info.\n";
78 std::cerr << "Could not locate bytecode file: '" << FN << "'\n";
79 return std::auto_ptr<Module>();
85 int main(int argc, char **argv) {
86 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
87 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
90 std::string ErrorMessage;
92 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
93 if (Composite.get() == 0) return 1;
95 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
96 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
97 if (M.get() == 0) return 1;
99 if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
101 if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
102 std::cerr << argv[0] << ": error linking in '" << InputFilenames[i]
103 << "': " << ErrorMessage << "\n";
108 if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
110 std::ostream *Out = &std::cout; // Default to printing to stdout...
111 if (OutputFilename != "-") {
112 if (!Force && std::ifstream(OutputFilename.c_str())) {
113 // If force is not specified, make sure not to overwrite a file!
114 std::cerr << argv[0] << ": error opening '" << OutputFilename
115 << "': file exists!\n"
116 << "Use -f command line argument to force output\n";
119 Out = new std::ofstream(OutputFilename.c_str());
121 std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
125 // Make sure that the Out file gets unlinked from the disk if we get a
127 RemoveFileOnSignal(OutputFilename);
130 if (verifyModule(*Composite.get())) {
131 std::cerr << argv[0] << ": linked module is broken!\n";
135 if (Verbose) std::cerr << "Writing bytecode...\n";
136 WriteBytecodeToFile(Composite.get(), *Out);
138 if (Out != &std::cout) delete Out;