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 static cl::opt<bool> NoCompress("disable-compression", cl::init(false),
46 cl::desc("Don't ompress the generated bytecode"));
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) {
53 if (!Filename.setFile(FN)) {
54 std::cerr << "Invalid file name: '" << FN << "'\n";
55 return std::auto_ptr<Module>();
58 std::string ErrorMessage;
59 if (Filename.exists()) {
60 if (Verbose) std::cerr << "Loading '" << Filename.c_str() << "'\n";
61 Module* Result = ParseBytecodeFile(Filename.get(), &ErrorMessage);
62 if (Result) return std::auto_ptr<Module>(Result); // Load successful!
65 std::cerr << "Error opening bytecode file: '" << Filename.c_str() << "'";
66 if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
70 std::cerr << "Bytecode file: '" << Filename.c_str()
71 << "' does not exist.\n";
74 return std::auto_ptr<Module>();
77 int main(int argc, char **argv) {
78 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
79 sys::PrintStackTraceOnErrorSignal();
80 assert(InputFilenames.size() > 0 && "OneOrMore is not working");
83 std::string ErrorMessage;
85 std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
86 if (Composite.get() == 0) {
87 std::cerr << argv[0] << ": error loading file '"
88 << InputFilenames[BaseArg] << "'\n";
92 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
93 std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
95 std::cerr << argv[0] << ": error loading file '"
96 << InputFilenames[i] << "'\n";
100 if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
102 if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
103 std::cerr << argv[0] << ": link error in '" << InputFilenames[i]
104 << "': " << ErrorMessage << "\n";
109 // TODO: Iterate over the -l list and link in any modules containing
110 // global symbols that have not been resolved so far.
112 if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
114 std::ostream *Out = &std::cout; // Default to printing to stdout...
115 if (OutputFilename != "-") {
116 if (!Force && std::ifstream(OutputFilename.c_str())) {
117 // If force is not specified, make sure not to overwrite a file!
118 std::cerr << argv[0] << ": error opening '" << OutputFilename
119 << "': file exists!\n"
120 << "Use -f command line argument to force output\n";
123 Out = new std::ofstream(OutputFilename.c_str());
125 std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
129 // Make sure that the Out file gets unlinked from the disk if we get a
131 sys::RemoveFileOnSignal(OutputFilename);
134 if (verifyModule(*Composite.get())) {
135 std::cerr << argv[0] << ": linked module is broken!\n";
139 if (Verbose) std::cerr << "Writing bytecode...\n";
140 WriteBytecodeToFile(Composite.get(), *Out, !NoCompress);
142 if (Out != &std::cout) delete Out;