8d67b8e053
We previously stopped producing Thumb2 relaxations when they weren't supported, but only diagnosed the case where an actual relocation was produced. We should also tell people if local symbols aren't going to work rather than silently overflowing. llvm-svn: 249164
80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
//===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
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#define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
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#include "MCTargetDesc/ARMFixupKinds.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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using namespace llvm;
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namespace {
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class ARMAsmBackend : public MCAsmBackend {
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const MCSubtargetInfo *STI;
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bool isThumbMode; // Currently emitting Thumb code.
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bool IsLittleEndian; // Big or little endian.
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public:
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ARMAsmBackend(const Target &T, const Triple &TT, bool IsLittle)
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: MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),
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isThumbMode(TT.getArchName().startswith("thumb")),
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IsLittleEndian(IsLittle) {}
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~ARMAsmBackend() override { delete STI; }
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unsigned getNumFixupKinds() const override {
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return ARM::NumTargetFixupKinds;
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}
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bool hasNOP() const { return STI->getFeatureBits()[ARM::HasV6T2Ops]; }
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const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
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/// processFixupValue - Target hook to process the literal value of a fixup
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/// if necessary.
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void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
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const MCFixup &Fixup, const MCFragment *DF,
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const MCValue &Target, uint64_t &Value,
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bool &IsResolved) override;
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unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, bool IsPCRel,
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MCContext *Ctx, bool IsLittleEndian,
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bool IsResolved) const;
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void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
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uint64_t Value, bool IsPCRel) const override;
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unsigned getRelaxedOpcode(unsigned Op) const;
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bool mayNeedRelaxation(const MCInst &Inst) const override;
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const char *reasonForFixupRelaxation(const MCFixup &Fixup,
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uint64_t Value) const;
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bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
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const MCRelaxableFragment *DF,
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const MCAsmLayout &Layout) const override;
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void relaxInstruction(const MCInst &Inst, MCInst &Res) const override;
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bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
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void handleAssemblerFlag(MCAssemblerFlag Flag) override;
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unsigned getPointerSize() const { return 4; }
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bool isThumb() const { return isThumbMode; }
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void setIsThumb(bool it) { isThumbMode = it; }
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bool isLittle() const { return IsLittleEndian; }
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};
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} // end anonymous namespace
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#endif
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