lib/Target/X86/X86AsmPrinter.h

//===-- X86AsmPrinter.h - Convert X86 LLVM code to Intel assembly ---------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file the shared super class printer that converts from our internal
// representation of machine-dependent LLVM code to Intel and AT&T format
// assembly language.  This printer is the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//

#ifndef X86ASMPRINTER_H
#define X86ASMPRINTER_H

#include "X86.h"
#include "X86TargetMachine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineDebugInfo.h"
#include "llvm/ADT/Statistic.h"
#include <set>


namespace llvm {

extern Statistic<> EmittedInsts;

/// X86DwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X
///
struct X86DwarfWriter : public DwarfWriter {
  X86DwarfWriter(std::ostream &o, AsmPrinter *ap) : DwarfWriter(o, ap) {
    needsSet = true;
    DwarfAbbrevSection = ".section __DWARFA,__debug_abbrev";
    DwarfInfoSection = ".section __DWARFA,__debug_info";
    DwarfLineSection = ".section __DWARFA,__debug_line";
    DwarfFrameSection = ".section __DWARFA,__debug_frame";
    DwarfPubNamesSection = ".section __DWARFA,__debug_pubnames";
    DwarfPubTypesSection = ".section __DWARFA,__debug_pubtypes";
    DwarfStrSection = ".section __DWARFA,__debug_str";
    DwarfLocSection = ".section __DWARFA,__debug_loc";
    DwarfARangesSection = ".section __DWARFA,__debug_aranges";
    DwarfRangesSection = ".section __DWARFA,__debug_ranges";
    DwarfMacInfoSection = ".section __DWARFA,__debug_macinfo";
    TextSection = ".text";
    DataSection = ".data";
  }
  virtual void virtfn();  // out of line virtual fn.
};

struct X86SharedAsmPrinter : public AsmPrinter {
  X86DwarfWriter DW;

  X86SharedAsmPrinter(std::ostream &O, X86TargetMachine &TM)
    : AsmPrinter(O, TM), DW(O, this) {
    Subtarget = &TM.getSubtarget<X86Subtarget>();
  }

  bool doInitialization(Module &M);
  bool doFinalization(Module &M);

  void getAnalysisUsage(AnalysisUsage &AU) const {
    AU.setPreservesAll();
    AU.addRequired<MachineDebugInfo>();
    MachineFunctionPass::getAnalysisUsage(AU);
  }

  const char *DefaultTextSection;   // "_text" for MASM, ".text" for others.
  const char *DefaultDataSection;   // "_data" for MASM, ".data" for others.
  const X86Subtarget *Subtarget;

  // Necessary for Darwin to print out the apprioriate types of linker stubs
  std::set<std::string> FnStubs, GVStubs, LinkOnceStubs;

  inline static bool isScale(const MachineOperand &MO) {
    return MO.isImmediate() &&
          (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
          MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
  }

  inline static bool isMem(const MachineInstr *MI, unsigned Op) {
    if (MI->getOperand(Op).isFrameIndex()) return true;
    return Op+4 <= MI->getNumOperands() &&
      MI->getOperand(Op  ).isRegister() && isScale(MI->getOperand(Op+1)) &&
      MI->getOperand(Op+2).isRegister() &&
      (MI->getOperand(Op+3).isImmediate() ||
       MI->getOperand(Op+3).isGlobalAddress() ||
       MI->getOperand(Op+3).isConstantPoolIndex());
  }
};

} // end namespace llvm

#endif