path: root/lib/Target/ARM/ARMAsmPrinter.cpp

//===-- ARMAsmPrinter.cpp - ARM LLVM assembly writer ----------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the "Instituto Nokia de Tecnologia" and
// 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 GAS-format ARM assembly language.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "asm-printer"
#include "ARM.h"
#include "ARMTargetMachine.h"
#include "ARMAddressingModes.h"
#include "ARMConstantPoolValue.h"
#include "ARMMachineFunctionInfo.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include <cctype>
using namespace llvm;

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

namespace {
  struct VISIBILITY_HIDDEN ARMAsmPrinter : public AsmPrinter {
    ARMAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
      : AsmPrinter(O, TM, T), DW(O, this, T), AFI(NULL), InCPMode(false) {
      Subtarget = &TM.getSubtarget<ARMSubtarget>();
    }

    DwarfWriter DW;

    /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
    /// make the right decision when printing asm code for different targets.
    const ARMSubtarget *Subtarget;

    /// AFI - Keep a pointer to ARMFunctionInfo for the current
    /// MachineFunction
    ARMFunctionInfo *AFI;

    /// We name each basic block in a Function with a unique number, so
    /// that we can consistently refer to them later. This is cleared
    /// at the beginning of each call to runOnMachineFunction().
    ///
    typedef std::map<const Value *, unsigned> ValueMapTy;
    ValueMapTy NumberForBB;

    /// Keeps the set of GlobalValues that require non-lazy-pointers for
    /// indirect access.
    std::set<std::string> GVNonLazyPtrs;

    /// Keeps the set of external function GlobalAddresses that the asm
    /// printer should generate stubs for.
    std::set<std::string> FnStubs;

    /// True if asm printer is printing a series of CONSTPOOL_ENTRY.
    bool InCPMode;
    
    virtual const char *getPassName() const {
      return "ARM Assembly Printer";
    }

    void printOperand(const MachineInstr *MI, int opNum,
                      const char *Modifier = 0);
    void printSOImmOperand(const MachineInstr *MI, int opNum);
    void printSOImm2PartOperand(const MachineInstr *MI, int opNum);
    void printSORegOperand(const MachineInstr *MI, int opNum);
    void printAddrMode2Operand(const MachineInstr *MI, int OpNo);
    void printAddrMode2OffsetOperand(const MachineInstr *MI, int OpNo);
    void printAddrMode3Operand(const MachineInstr *MI, int OpNo);
    void printAddrMode3OffsetOperand(const MachineInstr *MI, int OpNo);
    void printAddrMode4Operand(const MachineInstr *MI, int OpNo,
                               const char *Modifier = 0);
    void printAddrMode5Operand(const MachineInstr *MI, int OpNo,
                               const char *Modifier = 0);
    void printAddrModePCOperand(const MachineInstr *MI, int OpNo,
                                const char *Modifier = 0);
    void printThumbAddrModeRROperand(const MachineInstr *MI, int OpNo);
    void printThumbAddrModeRI5Operand(const MachineInstr *MI, int OpNo,
                                      unsigned Scale);
    void printThumbAddrModeS1Operand(const MachineInstr *MI, int OpNo);
    void printThumbAddrModeS2Operand(const MachineInstr *MI, int OpNo);
    void printThumbAddrModeS4Operand(const MachineInstr *MI, int OpNo);
    void printThumbAddrModeSPOperand(const MachineInstr *MI, int OpNo);
    void printCCOperand(const MachineInstr *MI, int opNum);
    void printPCLabel(const MachineInstr *MI, int opNum);
    void printRegisterList(const MachineInstr *MI, int opNum);
    void printCPInstOperand(const MachineInstr *MI, int opNum,
                            const char *Modifier);
    void printJTBlockOperand(const MachineInstr *MI, int opNum);

    virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                                 unsigned AsmVariant, const char *ExtraCode);

    bool printInstruction(const MachineInstr *MI);  // autogenerated.
    void printMachineInstruction(const MachineInstr *MI);
    bool