lib/Target/X86/Printer.cpp

//===-- X86/Printer.cpp - Convert X86 code to human readable rep. ---------===//
//
// This file contains a printer that converts from our internal representation
// of LLVM code to a nice human readable form that is suitable for debuggging.
//
//===----------------------------------------------------------------------===//

#include "X86.h"
#include "X86InstrInfo.h"
#include "llvm/Pass.h"
#include "llvm/Function.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"

namespace {
  struct Printer : public FunctionPass {
    TargetMachine &TM;
    std::ostream &O;

    Printer(TargetMachine &tm, std::ostream &o) : TM(tm), O(o) {}

    bool runOnFunction(Function &F);
  };
}

/// createX86CodePrinterPass - Print out the specified machine code function to
/// the specified stream.  This function should work regardless of whether or
/// not the function is in SSA form or not.
///
Pass *createX86CodePrinterPass(TargetMachine &TM, std::ostream &O) {
  return new Printer(TM, O);
}


/// runOnFunction - This uses the X86InstructionInfo::print method
/// to print assembly for each instruction.
bool Printer::runOnFunction (Function & F)
{
  static unsigned bbnumber = 0;
  MachineFunction & MF = MachineFunction::get (&F);
  const MachineInstrInfo & MII = TM.getInstrInfo ();

  O << "# x86 printing only sorta implemented so far!\n";

  // Print out labels for the function.
  O << "\t.globl\t" << F.getName () << "\n";
  O << "\t.type\t" << F.getName () << ", @function\n";
  O << F.getName () << ":\n";

  // Print out code for the function.
  for (MachineFunction::const_iterator bb_i = MF.begin (), bb_e = MF.end ();
       bb_i != bb_e; ++bb_i)
    {
      // Print a label for the basic block.
      O << ".BB" << bbnumber++ << ":\n";
      for (MachineBasicBlock::const_iterator i_i = bb_i->begin (), i_e =
	   bb_i->end (); i_i != i_e; ++i_i)
	{
	  // Print the assembly for the instruction.
	  O << "\t";
          MII.print(*i_i, O);
	}
    }

  // We didn't modify anything.
  return false;
}


// print - Print out an x86 instruction in intel syntax
void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O) const {
  // FIXME: This sucks.
  O << getName(MI->getOpCode()) << "\n";
}