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