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/Signals.h"
24 #include <sys/types.h> // For FileExists
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 static cl::list<std::string>
46 LibPaths("L", cl::desc("Specify a library search path"), cl::ZeroOrMore,
47 cl::value_desc("directory"), cl::Prefix);
49 // FileExists - Return true if the specified string is an openable file...
50 static inline bool FileExists(const std::string &FN) {
52 return stat(FN.c_str(), &StatBuf) != -1;
55 // LoadFile - Read the specified bytecode file in and return it. This routine
56 // searches the link path for the specified file to try to find it...
58 static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
59 std::string Filename = FN;
60 std::string ErrorMessage;
62 unsigned NextLibPathIdx = 0;
63 bool FoundAFile = false;
66 if (Verbose) std::cerr << "Loading '" << Filename << "'\n";
67 if (FileExists(Filename)) FoundAFile = true;
68 Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
69 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
72 std::cerr << "Error opening bytecode file: '" << Filename << "'";
73 if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
77 if (NextLibPathIdx == LibPaths.size()) break;
78 Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
82 std::cerr << "Bytecode file '" << FN << "' corrupt! "
83 << "Use 'llvm-link -v ...' for more info.\n";
85 std::cerr << "Could not locate bytecode file: '" << FN << "'\n";
86 return std::auto_ptr<Module>();
92 int main(int argc, char **argv) {
93 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
94 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
97 std::string ErrorMessage;
99 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
100 if (Composite.get() == 0) return 1;
102 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
103 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
104 if (M.get() == 0) return 1;
106 if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
108 if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
109 std::cerr << argv[0] << ": error linking in '" << InputFilenames[i]
110 << "': " << ErrorMessage << "\n";
115 if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
117 std::ostream *Out = &std::cout; // Default to printing to stdout...
118 if (OutputFilename != "-") {
119 if (!Force && std::ifstream(OutputFilename.c_str())) {
120 // If force is not specified, make sure not to overwrite a file!
121 std::cerr << argv[0] << ": error opening '" << OutputFilename
122 << "': file exists!\n"
123 << "Use -f command line argument to force output\n";
126 Out = new std::ofstream(OutputFilename.c_str());
128 std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
132 // Make sure that the Out file gets unlinked from the disk if we get a
134 RemoveFileOnSignal(OutputFilename);
137 if (verifyModule(*Composite.get())) {
138 std::cerr << argv[0] << ": linked module is broken!\n";
142 if (Verbose) std::cerr << "Writing bytecode...\n";
143 WriteBytecodeToFile(Composite.get(), *Out);
145 if (Out != &std::cout) delete Out;