path: root/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp

//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to PowerPC assembly language. This printer is
// the output mechanism used by `llc'.
//
// Documentation at http://developer.apple.com/documentation/DeveloperTools/
// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "asmprinter"
#include "PPC.h"
#include "PPCPredicates.h"
#include "PPCTargetMachine.h"
#include "PPCSubtarget.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/MC/MCSection.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSet.h"
using namespace llvm;

STATISTIC(EmittedInsts, "Number of machine instrs printed");

namespace {
  class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
  protected:
    struct FnStubInfo {
      std::string Stub, LazyPtr, AnonSymbol;
      
      FnStubInfo() {}
      
      void Init(const GlobalValue *GV, Mangler *Mang) {
        // Already initialized.
        if (!Stub.empty()) return;
        Stub = Mang->getMangledName(GV, "$stub", true);
        LazyPtr = Mang->getMangledName(GV, "$lazy_ptr", true);
        AnonSymbol = Mang->getMangledName(GV, "$stub$tmp", true);
      }

      void Init(const std::string &GV, Mangler *Mang) {
        // Already initialized.
        if (!Stub.empty()) return;
        Stub = Mang->makeNameProper(GV + "$stub",
                                    Mangler::Private);
        LazyPtr = Mang->makeNameProper(GV + "$lazy_ptr",
                                       Mangler::Private);
        AnonSymbol = Mang->makeNameProper(GV + "$stub$tmp",
                                          Mangler::Private);
      }
    };
    
    StringMap<FnStubInfo> FnStubs;
    StringMap<std::string> GVStubs, HiddenGVStubs;
    const PPCSubtarget &Subtarget;
  public:
    explicit PPCAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
                           const TargetAsmInfo *T, bool V)
      : AsmPrinter(O, TM, T, V),
        Subtarget(TM.getSubtarget<PPCSubtarget>()) {}

    virtual const char *getPassName() const {
      return "PowerPC Assembly Printer";
    }

    PPCTargetMachine &getTM() {
      return static_cast<PPCTargetMachine&>(TM);
    }

    unsigned enumRegToMachineReg(unsigned enumReg) {
      switch (enumReg) {
      default: llvm_unreachable("Unhandled register!");
      case PPC::CR0:  return  0;
      case PPC::CR1:  return  1