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than on MipsSubtargetInfo. This required a bit of massaging in the MC level to handle this since MC is a) largely a collection of disparate classes with no hierarchy, and b) there's no overarching equivalent to the TargetMachine, instead only the subtarget via MCSubtargetInfo (which is the base class of TargetSubtargetInfo). We're now storing the ABI in both the TargetMachine level and in the MC level because the AsmParser and the TargetStreamer both need to know what ABI we have to parse assembly and emit objects. The target streamer has a pointer to the one in the asm parser and is updated when the asm parser is created. This is fragile as the FIXME comment notes, but shouldn't be a problem in practice since we always create an asm parser before attempting to emit object code via the assembler. The TargetMachine now contains the ABI so that the DataLayout can be constructed dependent upon ABI. All testcases have been updated to use the -target-abi command line flag so that we can set the ABI without using a subtarget feature. Should be no change visible externally here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227102 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
//===-------- MipsELFStreamer.h - ELF Object Output -----------------------===//
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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, MCAsmBackend &MAB, raw_ostream &OS,
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MCCodeEmitter *Emitter, const MCSubtargetInfo &STI)
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: MCELFStreamer(Context, MAB, OS, Emitter) {
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RegInfoRecord = new MipsRegInfoRecord(this, Context);
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MipsOptionRecords.push_back(
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std::unique_ptr<MipsRegInfoRecord>(RegInfoRecord));
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}
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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) 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) 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(const MCSection *Section,
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const MCExpr *Subsection = nullptr) 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 .word directive is emitted.
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void EmitValueImpl(const MCExpr *Value, unsigned Size,
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const SMLoc &Loc) 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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};
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MCELFStreamer *createMipsELFStreamer(MCContext &Context, MCAsmBackend &MAB,
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raw_ostream &OS, MCCodeEmitter *Emitter,
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const MCSubtargetInfo &STI, bool RelaxAll);
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} // namespace llvm.
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#endif
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