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//===----------------------------------------------------------------------===//
// LLVM 'DIS' UTILITY
//
// This utility may be invoked in the following manner:
// dis [options] - Read LLVM bytecode from stdin, write assembly to stdout
// dis [options] x.bc - Read LLVM bytecode from the x.bc file, write assembly
// to the x.ll file.
// Options:
// --help - Output information about command line switches
// -c - Print C code instead of LLVM assembly
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Assembly/CWriter.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include <fstream>
#include <memory>
using std::cerr;
// OutputMode - The different orderings to print basic blocks in...
enum OutputMode {
llvm = 0, // Generate LLVM assembly (the default)
c, // Generate C code
};
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
static cl::opt<enum OutputMode>
WriteMode(cl::desc("Specify the output format:"),
cl::values(
clEnumVal(llvm, "Output LLVM assembly"),
clEnumVal(c , "Output C code for program"),
0));
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
std::ostream *Out = &std::cout; // Default to printing to stdout...
std::string ErrorMessage;
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
if (M.get() == 0) {
cerr << argv[0] << ": ";
if (ErrorMessage.size())
cerr << ErrorMessage << "\n";
else
cerr << "bytecode didn't read correctly.\n";
return 1;
}
if (OutputFilename != "") { // Specified an output filename?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists! Sending to standard output.\n";
} else {
Out = new std::ofstream(OutputFilename.c_str());
}
} else {
if (InputFilename == "-") {
OutputFilename = "-";
} else {
std::string IFN = InputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
// Source ends in .bc
OutputFilename = std::string(IFN.begin(), IFN.end()-3);
} else {
OutputFilename = IFN; // Append a .ll to it
}
if (WriteMode == c)
OutputFilename += ".c";
else
OutputFilename += ".ll";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists! Sending to standard output.\n";
} else {
Out = new std::ofstream(OutputFilename.c_str());
// Make sure that the Out file gets unlink'd from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
}
}
}
if (!Out->good()) {
cerr << argv[0] << ": error opening " << OutputFilename
<< ": sending to stdout instead!\n";
Out = &std::cout;
}
// All that dis does is write the assembly or C out to a file...
//
PassManager Passes;
switch (WriteMode) {
case llvm: // Output LLVM assembly
Passes.add(new PrintModulePass(Out));
break;
case c: // Convert LLVM to C
Passes.add(createWriteToCPass(*Out));
break;
}
Passes.run(*M.get());
if (Out != &std::cout) {
((std::ofstream*)Out)->close();
delete Out;
}
return 0;
}
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