b524459288
The target independent AsmParser doesn't recognise .hword, .word, .dword which are required for Mips. Currently MipsAsmParser recognises these through dispatch to MipsAsmParser::parseDataDirective. This contains equivalent logic to AsmParser::parseDirectiveValue. This patch allows reuse of AsmParser::parseDirectiveValue by making use of addAliasForDirective to support .hword, .word and .dword. Original patch provided by Alex Bradbury at D47001 was modified to fix handling of microMIPS symbols. The `AsmParser::parseDirectiveValue` calls either `EmitIntValue` or `EmitValue`. In this patch we override `EmitIntValue` in the `MipsELFStreamer` to clear a pending set of microMIPS symbols. Differential revision: https://reviews.llvm.org/D49539 llvm-svn: 337893
78 lines
3.0 KiB
C++
78 lines
3.0 KiB
C++
//===- MipsELFStreamer.h - ELF Object Output --------------------*- 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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//
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// This is a custom MCELFStreamer which allows us to insert some hooks before
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// emitting data into an actual object file.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H
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#define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H
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#include "MipsOptionRecord.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCELFStreamer.h"
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#include <memory>
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namespace llvm {
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class MCAsmBackend;
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class MCCodeEmitter;
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class MCContext;
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class MCSubtargetInfo;
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class MipsELFStreamer : public MCELFStreamer {
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SmallVector<std::unique_ptr<MipsOptionRecord>, 8> MipsOptionRecords;
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MipsRegInfoRecord *RegInfoRecord;
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SmallVector<MCSymbol*, 4> Labels;
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public:
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MipsELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter);
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/// Overriding this function allows us to add arbitrary behaviour before the
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/// \p Inst is actually emitted. For example, we can inspect the operands and
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/// gather sufficient information that allows us to reason about the register
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/// usage for the translation unit.
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void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
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bool = false) override;
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/// Overriding this function allows us to record all labels that should be
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/// marked as microMIPS. Based on this data marking is done in
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/// EmitInstruction.
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void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
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/// Overriding this function allows us to dismiss all labels that are
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/// candidates for marking as microMIPS when .section directive is processed.
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void SwitchSection(MCSection *Section,
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const MCExpr *Subsection = nullptr) override;
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/// Overriding these functions allows us to dismiss all labels that are
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/// candidates for marking as microMIPS when .word/.long/.4byte etc
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/// directives are emitted.
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void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override;
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void EmitIntValue(uint64_t Value, unsigned Size) override;
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/// Emits all the option records stored up until the point it's called.
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void EmitMipsOptionRecords();
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/// Mark labels as microMIPS, if necessary for the subtarget.
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void createPendingLabelRelocs();
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};
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MCELFStreamer *createMipsELFStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> MAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter,
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bool RelaxAll);
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H
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