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//===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
#define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
#include "MCTargetDesc/ARMFixupKinds.h"
#include "MCTargetDesc/ARMMCTargetDesc.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/TargetRegistry.h"
namespace llvm {
class ARMAsmBackend : public MCAsmBackend {
const MCSubtargetInfo *STI;
bool isThumbMode; // Currently emitting Thumb code.
bool IsLittleEndian; // Big or little endian.
public:
ARMAsmBackend(const Target &T, const Triple &TT, bool IsLittle)
: MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),
isThumbMode(TT.getArchName().startswith("thumb")),
IsLittleEndian(IsLittle) {}
~ARMAsmBackend() override { delete STI; }
unsigned getNumFixupKinds() const override {
return ARM::NumTargetFixupKinds;
}
bool hasNOP() const { return STI->getFeatureBits()[ARM::HasV6T2Ops]; }
const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
/// processFixupValue - Target hook to process the literal value of a fixup
/// if necessary.
void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
const MCFixup &Fixup, const MCFragment *DF,
const MCValue &Target, uint64_t &Value,
bool &IsResolved) override;
unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, bool IsPCRel,
MCContext *Ctx, bool IsLittleEndian,
bool IsResolved) const;
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value, bool IsPCRel) const override;
unsigned getRelaxedOpcode(unsigned Op) const;
bool mayNeedRelaxation(const MCInst &Inst) const override;
const char *reasonForFixupRelaxation(const MCFixup &Fixup,
uint64_t Value) const;
bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
const MCRelaxableFragment *DF,
const MCAsmLayout &Layout) const override;
void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
MCInst &Res) const override;
bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
void handleAssemblerFlag(MCAssemblerFlag Flag) override;
unsigned getPointerSize() const { return 4; }
bool isThumb() const { return isThumbMode; }
void setIsThumb(bool it) { isThumbMode = it; }
bool isLittle() const { return IsLittleEndian; }
};
} // end namespace llvm
#endif
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