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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
// -dfo - Print basic blocks in depth first order
// -rdfo - Print basic blocks in reverse depth first order
// -po - Print basic blocks in post order
// -rpo - Print basic blocks in reverse post order
//
// TODO: add -vcg which prints VCG compatible output.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Method.h"
#include "Support/DepthFirstIterator.h"
#include "Support/PostOrderIterator.h"
#include "Support/CommandLine.h"
#include <fstream>
// OutputMode - The different orderings to print basic blocks in...
enum OutputMode {
Default = 0, // Method Order (list order)
dfo, // Depth First ordering
rdfo, // Reverse Depth First ordering
po, // Post Order
rpo, // Reverse Post Order
};
cl::String InputFilename ("", "Load <arg> file, print as assembly", 0, "-");
cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
cl::EnumFlags<enum OutputMode> WriteMode(cl::NoFlags,
clEnumVal(Default, "Write basic blocks in bytecode order"),
clEnumVal(dfo , "Write basic blocks in depth first order"),
clEnumVal(rdfo , "Write basic blocks in reverse DFO"),
clEnumVal(po , "Write basic blocks in postorder"),
clEnumVal(rpo , "Write basic blocks in reverse postorder"),
0);
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
ostream *Out = &cout; // Default to printing to stdout...
Module *C = ParseBytecodeFile(InputFilename);
if (C == 0) {
cerr << "bytecode didn't read correctly.\n";
return 1;
}
if (OutputFilename != "") { // Specified an output filename?
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &cout;
} else {
string IFN = InputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
// Source ends in .bc
OutputFilename = string(IFN.begin(), IFN.end()-3);
} else {
OutputFilename = IFN; // Append a .ll to it
}
OutputFilename += ".ll";
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
}
}
if (!Out->good()) {
cerr << "Error opening " << OutputFilename
<< ": sending to stdout instead!\n";
Out = &cout;
}
// All that dis does is write the assembly out to a file... which is exactly
// what the writer library is supposed to do...
//
if (WriteMode == Default) {
(*Out) << C; // Print out in list order
} else {
// TODO: This does not print anything other than the basic blocks in the
// methods... more should definately be printed. It should be valid output
// consumable by the assembler.
//
for (Module::iterator I = C->begin(), End = C->end(); I != End; ++I) {
Method *M = *I;
(*Out) << "-------------- Method: " << M->getName() << " -------------\n";
switch (WriteMode) {
case dfo: // Depth First ordering
copy(df_begin(M), df_end(M),
ostream_iterator<BasicBlock*>(*Out, "\n"));
break;
case rdfo: // Reverse Depth First ordering
copy(df_begin(M, true), df_end(M),
ostream_iterator<BasicBlock*>(*Out, "\n"));
break;
case po: // Post Order
copy(po_begin(M), po_end(M),
ostream_iterator<BasicBlock*>(*Out, "\n"));
break;
case rpo: { // Reverse Post Order
ReversePostOrderTraversal RPOT(M);
copy(RPOT.begin(), RPOT.end(),
ostream_iterator<BasicBlock*>(*Out, "\n"));
break;
}
default:
abort();
break;
}
}
}
delete C;
if (Out != &cout) delete Out;
return 0;
}
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