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
27 static cl::list<std::string>
28 InputFilenames(cl::Positional, cl::OneOrMore,
29 cl::desc("<input bytecode files>"));
31 static cl::opt<std::string>
32 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
33 cl::value_desc("filename"));
35 static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
38 Verbose("v", cl::desc("Print information about actions taken"));
41 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
43 static cl::list<std::string>
44 LibPaths("L", cl::desc("Specify a library search path"), cl::ZeroOrMore,
45 cl::value_desc("directory"), cl::Prefix);
47 // FileExists - Return true if the specified string is an openable file...
48 static inline bool FileExists(const std::string &FN) {
50 return stat(FN.c_str(), &StatBuf) != -1;
53 // LoadFile - Read the specified bytecode file in and return it. This routine
54 // searches the link path for the specified file to try to find it...
56 static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
57 std::string Filename = FN;
58 std::string ErrorMessage;
60 unsigned NextLibPathIdx = 0;
61 bool FoundAFile = false;
64 if (Verbose) std::cerr << "Loading '" << Filename << "'\n";
65 if (FileExists(Filename)) FoundAFile = true;
66 Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
67 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
70 std::cerr << "Error opening bytecode file: '" << Filename << "'";
71 if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
75 if (NextLibPathIdx == LibPaths.size()) break;
76 Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
80 std::cerr << "Bytecode file '" << FN << "' corrupt! "
81 << "Use 'llvm-link -v ...' for more info.\n";
83 std::cerr << "Could not locate bytecode file: '" << FN << "'\n";
84 return std::auto_ptr<Module>();
90 int main(int argc, char **argv) {
91 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
92 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
95 std::string ErrorMessage;
97 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
98 if (Composite.get() == 0) return 1;
100 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
101 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
102 if (M.get() == 0) return 1;
104 if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
106 if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
107 std::cerr << argv[0] << ": error linking in '" << InputFilenames[i]
108 << "': " << ErrorMessage << "\n";
113 if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
115 std::ostream *Out = &std::cout; // Default to printing to stdout...
116 if (OutputFilename != "-") {
117 if (!Force && std::ifstream(OutputFilename.c_str())) {
118 // If force is not specified, make sure not to overwrite a file!
119 std::cerr << argv[0] << ": error opening '" << OutputFilename
120 << "': file exists!\n"
121 << "Use -f command line argument to force output\n";
124 Out = new std::ofstream(OutputFilename.c_str());
126 std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
130 // Make sure that the Out file gets unlinked from the disk if we get a
132 RemoveFileOnSignal(OutputFilename);
135 if (verifyModule(*Composite.get())) {
136 std::cerr << argv[0] << ": linked module is broken!\n";
140 if (Verbose) std::cerr << "Writing bytecode...\n";
141 WriteBytecodeToFile(Composite.get(), *Out);
143 if (Out != &std::cout) delete Out;