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 //===----------------------------------------------------------------------===//
11 // This utility may be invoked in the following manner:
12 // llvm-link a.bc b.bc c.bc -o x.bc
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Module.h"
17 #include "llvm/Analysis/Verifier.h"
18 #include "llvm/Bytecode/Reader.h"
19 #include "llvm/Bytecode/Writer.h"
20 #include "llvm/Transforms/Utils/Linker.h"
21 #include "Support/CommandLine.h"
22 #include "Support/Signals.h"
25 #include <sys/types.h> // For FileExists
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 // FileExists - Return true if the specified string is an openable file...
49 static inline bool FileExists(const std::string &FN) {
51 return stat(FN.c_str(), &StatBuf) != -1;
54 // LoadFile - Read the specified bytecode file in and return it. This routine
55 // searches the link path for the specified file to try to find it...
57 static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
58 std::string Filename = FN;
59 std::string ErrorMessage;
61 unsigned NextLibPathIdx = 0;
62 bool FoundAFile = false;
65 if (Verbose) std::cerr << "Loading '" << Filename << "'\n";
66 if (FileExists(Filename)) FoundAFile = true;
67 Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
68 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
71 std::cerr << "Error opening bytecode file: '" << Filename << "'";
72 if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
76 if (NextLibPathIdx == LibPaths.size()) break;
77 Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
81 std::cerr << "Bytecode file '" << FN << "' corrupt! "
82 << "Use 'llvm-link -v ...' for more info.\n";
84 std::cerr << "Could not locate bytecode file: '" << FN << "'\n";
85 return std::auto_ptr<Module>();
91 int main(int argc, char **argv) {
92 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
93 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
96 std::string ErrorMessage;
98 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
99 if (Composite.get() == 0) return 1;
101 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
102 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
103 if (M.get() == 0) return 1;
105 if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
107 if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
108 std::cerr << argv[0] << ": error linking in '" << InputFilenames[i]
109 << "': " << ErrorMessage << "\n";
114 if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
116 std::ostream *Out = &std::cout; // Default to printing to stdout...
117 if (OutputFilename != "-") {
118 if (!Force && std::ifstream(OutputFilename.c_str())) {
119 // If force is not specified, make sure not to overwrite a file!
120 std::cerr << argv[0] << ": error opening '" << OutputFilename
121 << "': file exists!\n"
122 << "Use -f command line argument to force output\n";
125 Out = new std::ofstream(OutputFilename.c_str());
127 std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
131 // Make sure that the Out file gets unlinked from the disk if we get a
133 RemoveFileOnSignal(OutputFilename);
136 if (verifyModule(*Composite.get())) {
137 std::cerr << argv[0] << ": linked module is broken!\n";
141 if (Verbose) std::cerr << "Writing bytecode...\n";
142 WriteBytecodeToFile(Composite.get(), *Out);
144 if (Out != &std::cout) delete Out;