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/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.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/MathExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/SmallString.h"
using namespace llvm;

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

namespace {
  class PPCAsmPrinter : public AsmPrinter {
  protected:
    struct FnStubInfo {
      MCSymbol *Stub, *LazyPtr, *AnonSymbol;
      
      FnStubInfo() {
        Stub = LazyPtr = AnonSymbol = 0;
      }
      
      void Init(const GlobalValue *GV, AsmPrinter *Printer) {
        // Already initialized.
        if (Stub != 0) return;

        // Get the names.
        Stub = Printer->GetSymbolWithGlobalValueBase(GV, "$stub");
        LazyPtr = Printer->GetSymbolWithGlobalValueBase(GV, "$lazy_ptr");
        AnonSymbol = Printer->GetSymbolWithGlobalValueBase(GV, "$stub$tmp");
      }

      void Init(StringRef GVName, Mangler *Mang, MCContext &Ctx) {
        assert(!GVName.empty() && "external symbol name shouldn't be empty");
        if (Stub != 0) return; // Already initialized.
        // Get the names for the external symbol name.
        SmallString<128> TmpStr;
        Mang->getNameWithPrefix(TmpStr, GVName, Mangler::Private);
        TmpStr += "$stub";
        Stub = Ctx.GetOrCreateSymbol(TmpStr.str());
        TmpStr.erase(TmpStr.end()-5, TmpStr.end()); // Remove $stub

        TmpStr += "$lazy_ptr";
        LazyPtr = Ctx.GetOrCreateSymbol(TmpStr.str());