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https://github.com/c64scene-ar/llvm-6502.git
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5e195a4c8d
When MC was first added, targets could use hasRawTextSupport to keep features working before they were added to the MC interface. The design goal of MC is to provide an uniform api for printing assembly and object files. Short of relaxations and other corner cases, a object file is just another representation of the assembly. It was never the intention that targets would keep doing things like if (hasRawTextSupport()) Set flags in one way. else Set flags in another way. When they do that they create two code paths and the object file is no longer just another representation of the assembly. This also then requires testing with llc -filetype=obj, which is extremelly brittle. This patch removes some of these hacks by replacing them with smaller ones. The ARM flag setting is trivial, so I just moved it to the constructor. For Mips, the patch adds two temporary hack directives that allow the assembly to represent the same things as the object file was already able to. The hope is that the mips developers will replace the hack directives with the same ones that gas uses and drop the -print-hack-directives flag. I will also try to implement a target streamer interface, so that we can move this out of the common code. In summary, for any new work, two rules of the thumb are * Don't use "llc -filetype=obj" in tests. * Don't add calls to hasRawTextSupport. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192035 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
//===- MCELFStreamer.h - MCStreamer ELF Object File Interface ---*- 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_MC_MCELFSTREAMER_H
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#define LLVM_MC_MCELFSTREAMER_H
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/MC/SectionKind.h"
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#include "llvm/Support/DataTypes.h"
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#include <vector>
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namespace llvm {
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class MCAsmBackend;
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class MCAssembler;
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class MCCodeEmitter;
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class MCExpr;
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class MCInst;
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class MCSymbol;
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class MCSymbolData;
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class raw_ostream;
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class MCELFStreamer : public MCObjectStreamer {
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public:
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MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &OS,
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MCCodeEmitter *Emitter)
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: MCObjectStreamer(Context, TAB, OS, Emitter) {}
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MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &OS,
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MCCodeEmitter *Emitter, MCAssembler *Assembler)
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: MCObjectStreamer(Context, TAB, OS, Emitter, Assembler) {}
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virtual ~MCELFStreamer();
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/// @name MCStreamer Interface
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/// @{
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virtual void InitSections();
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virtual void InitToTextSection();
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virtual void ChangeSection(const MCSection *Section,
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const MCExpr *Subsection);
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitDebugLabel(MCSymbol *Symbol);
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
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virtual void EmitThumbFunc(MCSymbol *Func);
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virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
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virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment);
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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
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virtual void EmitCOFFSymbolStorageClass(int StorageClass);
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virtual void EmitCOFFSymbolType(int Type);
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virtual void EndCOFFSymbolDef();
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virtual MCSymbolData &getOrCreateSymbolData(MCSymbol *Symbol);
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment);
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virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
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uint64_t Size = 0, unsigned ByteAlignment = 0);
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virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment = 0);
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virtual void EmitValueImpl(const MCExpr *Value, unsigned Size);
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virtual void EmitFileDirective(StringRef Filename);
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virtual void EmitTCEntry(const MCSymbol &S);
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virtual void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned);
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virtual void Flush();
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virtual void FinishImpl();
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private:
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virtual void EmitInstToFragment(const MCInst &Inst);
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virtual void EmitInstToData(const MCInst &Inst);
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virtual void EmitBundleAlignMode(unsigned AlignPow2);
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virtual void EmitBundleLock(bool AlignToEnd);
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virtual void EmitBundleUnlock();
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void fixSymbolsInTLSFixups(const MCExpr *expr);
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struct LocalCommon {
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MCSymbolData *SD;
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uint64_t Size;
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unsigned ByteAlignment;
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};
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std::vector<LocalCommon> LocalCommons;
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SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
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void SetSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind);
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void SetSectionData();
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void SetSectionText();
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void SetSectionBss();
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};
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MCELFStreamer *createMipsELFStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter,
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bool RelaxAll, bool NoExecStack);
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MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter,
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bool RelaxAll, bool NoExecStack,
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bool IsThumb);
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} // end namespace llvm
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#endif
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