d3589edafc
`Data` now references the first byte of the fixup offset within the current fragment. MCAssembler::layout asserts that the fixup offset is within either the fixed-size content or the optional variable-size tail, as this is the most the generic code can validate without knowing the target-specific fixup size. Many backends applyFixup assert ``` assert(Offset + Size <= F.getSize() && "Invalid fixup offset!"); ``` This refactoring allows a subsequent change to move the fixed-size content outside of MCSection::ContentStorage, fixing the -fsanitize=pointer-overflow issue of #150846 Pull Request: https://github.com/llvm/llvm-project/pull/151724
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
//===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 "MCTargetDesc/ARMMCTargetDesc.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/TargetRegistry.h"
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namespace llvm {
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class ARMAsmBackend : public MCAsmBackend {
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public:
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ARMAsmBackend(const Target &T, llvm::endianness Endian)
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: MCAsmBackend(Endian) {}
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bool hasNOP(const MCSubtargetInfo *STI) const {
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return STI->hasFeature(ARM::HasV6T2Ops);
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}
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std::optional<MCFixupKind> getFixupKind(StringRef Name) const override;
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MCFixupKindInfo getFixupKindInfo(MCFixupKind Kind) const override;
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bool shouldForceRelocation(const MCFixup &Fixup, const MCValue &Target);
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unsigned adjustFixupValue(const MCAssembler &Asm, const MCFixup &Fixup,
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const MCValue &Target, uint64_t Value,
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bool IsResolved, MCContext &Ctx,
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const MCSubtargetInfo *STI) const;
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std::optional<bool> evaluateFixup(const MCFragment &, MCFixup &, MCValue &,
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uint64_t &) override;
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void applyFixup(const MCFragment &, const MCFixup &, const MCValue &Target,
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uint8_t *Data, uint64_t Value, bool IsResolved) override;
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unsigned getRelaxedOpcode(unsigned Op, const MCSubtargetInfo &STI) const;
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bool mayNeedRelaxation(unsigned Opcode, ArrayRef<MCOperand> Operands,
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const MCSubtargetInfo &STI) 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 fixupNeedsRelaxationAdvanced(const MCFragment &, const MCFixup &,
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const MCValue &, uint64_t,
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bool) const override;
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void relaxInstruction(MCInst &Inst,
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const MCSubtargetInfo &STI) const override;
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bool writeNopData(raw_ostream &OS, uint64_t Count,
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const MCSubtargetInfo *STI) const override;
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unsigned getPointerSize() const { return 4; }
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};
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} // end namespace llvm
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#endif
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