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279ef837e8
It was calling ChangeSection with the wrong current section, eventually leading to a crash. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239335 91177308-0d34-0410-b5e6-96231b3b80d8
746 lines
28 KiB
C++
746 lines
28 KiB
C++
//===- MCStreamer.h - High-level Streaming Machine Code 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 file declares the MCStreamer class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSTREAMER_H
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#define LLVM_MC_MCSTREAMER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCLinkerOptimizationHint.h"
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#include "llvm/MC/MCWinEH.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/SMLoc.h"
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#include <string>
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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 MCExpr;
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class MCInst;
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class MCInstPrinter;
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class MCSection;
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class MCStreamer;
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class MCSymbol;
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class MCSymbolELF;
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class MCSymbolRefExpr;
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class MCSubtargetInfo;
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class StringRef;
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class Twine;
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class raw_ostream;
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class formatted_raw_ostream;
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class AssemblerConstantPools;
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typedef std::pair<MCSection *, const MCExpr *> MCSectionSubPair;
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/// Target specific streamer interface. This is used so that targets can
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/// implement support for target specific assembly directives.
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///
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/// If target foo wants to use this, it should implement 3 classes:
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/// * FooTargetStreamer : public MCTargetStreamer
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/// * FooTargetAsmStreamer : public FooTargetStreamer
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/// * FooTargetELFStreamer : public FooTargetStreamer
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///
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/// FooTargetStreamer should have a pure virtual method for each directive. For
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/// example, for a ".bar symbol_name" directive, it should have
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/// virtual emitBar(const MCSymbol &Symbol) = 0;
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///
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/// The FooTargetAsmStreamer and FooTargetELFStreamer classes implement the
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/// method. The assembly streamer just prints ".bar symbol_name". The object
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/// streamer does whatever is needed to implement .bar in the object file.
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///
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/// In the assembly printer and parser the target streamer can be used by
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/// calling getTargetStreamer and casting it to FooTargetStreamer:
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///
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/// MCTargetStreamer &TS = OutStreamer.getTargetStreamer();
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/// FooTargetStreamer &ATS = static_cast<FooTargetStreamer &>(TS);
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///
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/// The base classes FooTargetAsmStreamer and FooTargetELFStreamer should
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/// *never* be treated differently. Callers should always talk to a
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/// FooTargetStreamer.
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class MCTargetStreamer {
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protected:
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MCStreamer &Streamer;
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public:
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MCTargetStreamer(MCStreamer &S);
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virtual ~MCTargetStreamer();
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const MCStreamer &getStreamer() { return Streamer; }
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// Allow a target to add behavior to the EmitLabel of MCStreamer.
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virtual void emitLabel(MCSymbol *Symbol);
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// Allow a target to add behavior to the emitAssignment of MCStreamer.
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virtual void emitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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virtual void finish();
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};
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// FIXME: declared here because it is used from
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// lib/CodeGen/AsmPrinter/ARMException.cpp.
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class ARMTargetStreamer : public MCTargetStreamer {
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public:
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ARMTargetStreamer(MCStreamer &S);
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~ARMTargetStreamer() override;
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virtual void emitFnStart();
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virtual void emitFnEnd();
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virtual void emitCantUnwind();
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virtual void emitPersonality(const MCSymbol *Personality);
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virtual void emitPersonalityIndex(unsigned Index);
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virtual void emitHandlerData();
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virtual void emitSetFP(unsigned FpReg, unsigned SpReg,
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int64_t Offset = 0);
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virtual void emitMovSP(unsigned Reg, int64_t Offset = 0);
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virtual void emitPad(int64_t Offset);
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virtual void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
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bool isVector);
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virtual void emitUnwindRaw(int64_t StackOffset,
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const SmallVectorImpl<uint8_t> &Opcodes);
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virtual void switchVendor(StringRef Vendor);
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virtual void emitAttribute(unsigned Attribute, unsigned Value);
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virtual void emitTextAttribute(unsigned Attribute, StringRef String);
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virtual void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
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StringRef StringValue = "");
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virtual void emitFPU(unsigned FPU);
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virtual void emitArch(unsigned Arch);
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virtual void emitArchExtension(unsigned ArchExt);
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virtual void emitObjectArch(unsigned Arch);
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virtual void finishAttributeSection();
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virtual void emitInst(uint32_t Inst, char Suffix = '\0');
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virtual void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE);
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virtual void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value);
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void finish() override;
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/// Callback used to implement the ldr= pseudo.
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/// Add a new entry to the constant pool for the current section and return an
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/// MCExpr that can be used to refer to the constant pool location.
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const MCExpr *addConstantPoolEntry(const MCExpr *);
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/// Callback used to implemnt the .ltorg directive.
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/// Emit contents of constant pool for the current section.
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void emitCurrentConstantPool();
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private:
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std::unique_ptr<AssemblerConstantPools> ConstantPools;
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};
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/// \brief Streaming machine code generation interface.
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///
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/// This interface is intended to provide a programatic interface that is very
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/// similar to the level that an assembler .s file provides. It has callbacks
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/// to emit bytes, handle directives, etc. The implementation of this interface
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/// retains state to know what the current section is etc.
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///
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/// There are multiple implementations of this interface: one for writing out
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/// a .s file, and implementations that write out .o files of various formats.
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///
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class MCStreamer {
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MCContext &Context;
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std::unique_ptr<MCTargetStreamer> TargetStreamer;
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MCStreamer(const MCStreamer &) = delete;
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MCStreamer &operator=(const MCStreamer &) = delete;
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std::vector<MCDwarfFrameInfo> DwarfFrameInfos;
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MCDwarfFrameInfo *getCurrentDwarfFrameInfo();
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void EnsureValidDwarfFrame();
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MCSymbol *EmitCFICommon();
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std::vector<WinEH::FrameInfo *> WinFrameInfos;
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WinEH::FrameInfo *CurrentWinFrameInfo;
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void EnsureValidWinFrameInfo();
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/// \brief Tracks an index to represent the order a symbol was emitted in.
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/// Zero means we did not emit that symbol.
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DenseMap<const MCSymbol *, unsigned> SymbolOrdering;
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/// \brief This is stack of current and previous section values saved by
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/// PushSection.
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SmallVector<std::pair<MCSectionSubPair, MCSectionSubPair>, 4> SectionStack;
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protected:
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MCStreamer(MCContext &Ctx);
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virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
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virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &CurFrame);
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WinEH::FrameInfo *getCurrentWinFrameInfo() {
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return CurrentWinFrameInfo;
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}
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virtual void EmitWindowsUnwindTables();
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virtual void EmitRawTextImpl(StringRef String);
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public:
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virtual ~MCStreamer();
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void visitUsedExpr(const MCExpr &Expr);
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virtual void visitUsedSymbol(const MCSymbol &Sym);
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void setTargetStreamer(MCTargetStreamer *TS) {
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TargetStreamer.reset(TS);
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}
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/// State management
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///
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virtual void reset();
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MCContext &getContext() const { return Context; }
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MCTargetStreamer *getTargetStreamer() {
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return TargetStreamer.get();
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}
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unsigned getNumFrameInfos() { return DwarfFrameInfos.size(); }
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ArrayRef<MCDwarfFrameInfo> getDwarfFrameInfos() const {
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return DwarfFrameInfos;
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}
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unsigned getNumWinFrameInfos() { return WinFrameInfos.size(); }
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ArrayRef<WinEH::FrameInfo *> getWinFrameInfos() const {
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return WinFrameInfos;
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}
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void generateCompactUnwindEncodings(MCAsmBackend *MAB);
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/// \name Assembly File Formatting.
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/// @{
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/// \brief Return true if this streamer supports verbose assembly and if it is
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/// enabled.
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virtual bool isVerboseAsm() const { return false; }
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/// \brief Return true if this asm streamer supports emitting unformatted text
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/// to the .s file with EmitRawText.
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virtual bool hasRawTextSupport() const { return false; }
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/// \brief Is the integrated assembler required for this streamer to function
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/// correctly?
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virtual bool isIntegratedAssemblerRequired() const { return false; }
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/// \brief Add a textual command.
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///
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/// Typically for comments that can be emitted to the generated .s
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/// file if applicable as a QoI issue to make the output of the compiler
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/// more readable. This only affects the MCAsmStreamer, and only when
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/// verbose assembly output is enabled.
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///
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/// If the comment includes embedded \n's, they will each get the comment
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/// prefix as appropriate. The added comment should not end with a \n.
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virtual void AddComment(const Twine &T) {}
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/// \brief Return a raw_ostream that comments can be written to. Unlike
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/// AddComment, you are required to terminate comments with \n if you use this
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/// method.
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virtual raw_ostream &GetCommentOS();
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/// \brief Print T and prefix it with the comment string (normally #) and
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/// optionally a tab. This prints the comment immediately, not at the end of
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/// the current line. It is basically a safe version of EmitRawText: since it
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/// only prints comments, the object streamer ignores it instead of asserting.
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virtual void emitRawComment(const Twine &T, bool TabPrefix = true);
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/// AddBlankLine - Emit a blank line to a .s file to pretty it up.
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virtual void AddBlankLine() {}
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/// @}
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/// \name Symbol & Section Management
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/// @{
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/// \brief Return the current section that the streamer is emitting code to.
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MCSectionSubPair getCurrentSection() const {
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if (!SectionStack.empty())
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return SectionStack.back().first;
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return MCSectionSubPair();
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}
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MCSection *getCurrentSectionOnly() const { return getCurrentSection().first; }
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/// \brief Return the previous section that the streamer is emitting code to.
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MCSectionSubPair getPreviousSection() const {
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if (!SectionStack.empty())
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return SectionStack.back().second;
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return MCSectionSubPair();
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}
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/// \brief Returns an index to represent the order a symbol was emitted in.
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/// (zero if we did not emit that symbol)
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unsigned GetSymbolOrder(const MCSymbol *Sym) const {
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return SymbolOrdering.lookup(Sym);
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}
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/// \brief Update streamer for a new active section.
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///
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/// This is called by PopSection and SwitchSection, if the current
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/// section changes.
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virtual void ChangeSection(MCSection *, const MCExpr *);
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/// \brief Save the current and previous section on the section stack.
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void PushSection() {
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SectionStack.push_back(
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std::make_pair(getCurrentSection(), getPreviousSection()));
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}
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/// \brief Restore the current and previous section from the section stack.
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/// Calls ChangeSection as needed.
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///
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/// Returns false if the stack was empty.
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bool PopSection() {
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if (SectionStack.size() <= 1)
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return false;
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auto I = SectionStack.end();
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--I;
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MCSectionSubPair OldSection = I->first;
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--I;
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MCSectionSubPair NewSection = I->first;
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if (OldSection != NewSection)
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ChangeSection(NewSection.first, NewSection.second);
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SectionStack.pop_back();
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return true;
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}
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bool SubSection(const MCExpr *Subsection) {
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if (SectionStack.empty())
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return false;
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SwitchSection(SectionStack.back().first.first, Subsection);
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return true;
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}
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/// Set the current section where code is being emitted to \p Section. This
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/// is required to update CurSection.
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///
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/// This corresponds to assembler directives like .section, .text, etc.
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virtual void SwitchSection(MCSection *Section,
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const MCExpr *Subsection = nullptr);
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/// \brief Set the current section where code is being emitted to \p Section.
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/// This is required to update CurSection. This version does not call
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/// ChangeSection.
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void SwitchSectionNoChange(MCSection *Section,
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const MCExpr *Subsection = nullptr) {
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assert(Section && "Cannot switch to a null section!");
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MCSectionSubPair curSection = SectionStack.back().first;
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SectionStack.back().second = curSection;
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if (MCSectionSubPair(Section, Subsection) != curSection)
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SectionStack.back().first = MCSectionSubPair(Section, Subsection);
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}
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/// \brief Create the default sections and set the initial one.
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virtual void InitSections(bool NoExecStack);
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MCSymbol *endSection(MCSection *Section);
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/// \brief Sets the symbol's section.
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///
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/// Each emitted symbol will be tracked in the ordering table,
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/// so we can sort on them later.
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void AssignSection(MCSymbol *Symbol, MCSection *Section);
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/// \brief Emit a label for \p Symbol into the current section.
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///
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/// This corresponds to an assembler statement such as:
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/// foo:
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///
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/// \param Symbol - The symbol to emit. A given symbol should only be
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/// emitted as a label once, and symbols emitted as a label should never be
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/// used in an assignment.
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// FIXME: These emission are non-const because we mutate the symbol to
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// add the section we're emitting it to later.
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol);
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/// \brief Note in the output the specified \p Flag.
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
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/// \brief Emit the given list \p Options of strings as linker
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/// options into the output.
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virtual void EmitLinkerOptions(ArrayRef<std::string> Kind) {}
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/// \brief Note in the output the specified region \p Kind.
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virtual void EmitDataRegion(MCDataRegionType Kind) {}
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/// \brief Specify the MachO minimum deployment target version.
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virtual void EmitVersionMin(MCVersionMinType, unsigned Major, unsigned Minor,
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unsigned Update) {}
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/// \brief Note in the output that the specified \p Func is a Thumb mode
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/// function (ARM target only).
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virtual void EmitThumbFunc(MCSymbol *Func);
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/// \brief Emit an assignment of \p Value to \p Symbol.
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///
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/// This corresponds to an assembler statement such as:
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/// symbol = value
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///
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/// The assignment generates no code, but has the side effect of binding the
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/// value in the current context. For the assembly streamer, this prints the
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/// binding into the .s file.
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///
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/// \param Symbol - The symbol being assigned to.
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/// \param Value - The value for the symbol.
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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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/// \brief Emit an weak reference from \p Alias to \p Symbol.
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///
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/// This corresponds to an assembler statement such as:
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/// .weakref alias, symbol
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///
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/// \param Alias - The alias that is being created.
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/// \param Symbol - The symbol being aliased.
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virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
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/// \brief Add the given \p Attribute to \p Symbol.
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virtual bool EmitSymbolAttribute(MCSymbol *Symbol,
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MCSymbolAttr Attribute) = 0;
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/// \brief Set the \p DescValue for the \p Symbol.
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///
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/// \param Symbol - The symbol to have its n_desc field set.
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/// \param DescValue - The value to set into the n_desc field.
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
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/// \brief Start emitting COFF symbol definition
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///
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/// \param Symbol - The symbol to have its External & Type fields set.
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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
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/// \brief Emit the storage class of the symbol.
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///
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/// \param StorageClass - The storage class the symbol should have.
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virtual void EmitCOFFSymbolStorageClass(int StorageClass);
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/// \brief Emit the type of the symbol.
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///
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/// \param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h)
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virtual void EmitCOFFSymbolType(int Type);
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/// \brief Marks the end of the symbol definition.
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virtual void EndCOFFSymbolDef();
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virtual void EmitCOFFSafeSEH(MCSymbol const *Symbol);
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/// \brief Emits a COFF section index.
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///
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/// \param Symbol - Symbol the section number relocation should point to.
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virtual void EmitCOFFSectionIndex(MCSymbol const *Symbol);
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/// \brief Emits a COFF section relative relocation.
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///
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/// \param Symbol - Symbol the section relative relocation should point to.
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virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
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/// \brief Emit an ELF .size directive.
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///
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/// This corresponds to an assembler statement such as:
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/// .size symbol, expression
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virtual void emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value);
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/// \brief Emit a Linker Optimization Hint (LOH) directive.
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/// \param Args - Arguments of the LOH.
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virtual void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {}
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/// \brief Emit a common symbol.
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///
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/// \param Symbol - The common symbol to emit.
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/// \param Size - The size of the common symbol.
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/// \param ByteAlignment - The alignment of the symbol if
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/// non-zero. This must be a power of 2.
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) = 0;
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/// \brief Emit a local common (.lcomm) symbol.
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///
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/// \param Symbol - The common symbol to emit.
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/// \param Size - The size of the common symbol.
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/// \param ByteAlignment - The alignment of the common symbol in bytes.
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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment);
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/// \brief Emit the zerofill section and an optional symbol.
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///
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/// \param Section - The zerofill section to create and or to put the symbol
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/// \param Symbol - The zerofill symbol to emit, if non-NULL.
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/// \param Size - The size of the zerofill symbol.
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/// \param ByteAlignment - The alignment of the zerofill symbol if
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/// non-zero. This must be a power of 2 on some targets.
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virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
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uint64_t Size = 0, unsigned ByteAlignment = 0) = 0;
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/// \brief Emit a thread local bss (.tbss) symbol.
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///
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/// \param Section - The thread local common section.
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/// \param Symbol - The thread local common symbol to emit.
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/// \param Size - The size of the symbol.
|
|
/// \param ByteAlignment - The alignment of the thread local common symbol
|
|
/// if non-zero. This must be a power of 2 on some targets.
|
|
virtual void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment = 0);
|
|
|
|
/// @}
|
|
/// \name Generating Data
|
|
/// @{
|
|
|
|
/// \brief Emit the bytes in \p Data into the output.
|
|
///
|
|
/// This is used to implement assembler directives such as .byte, .ascii,
|
|
/// etc.
|
|
virtual void EmitBytes(StringRef Data);
|
|
|
|
/// \brief Emit the expression \p Value into the output as a native
|
|
/// integer of the given \p Size bytes.
|
|
///
|
|
/// This is used to implement assembler directives such as .word, .quad,
|
|
/// etc.
|
|
///
|
|
/// \param Value - The value to emit.
|
|
/// \param Size - The size of the integer (in bytes) to emit. This must
|
|
/// match a native machine width.
|
|
/// \param Loc - The location of the expression for error reporting.
|
|
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
const SMLoc &Loc = SMLoc());
|
|
|
|
void EmitValue(const MCExpr *Value, unsigned Size,
|
|
const SMLoc &Loc = SMLoc());
|
|
|
|
/// \brief Special case of EmitValue that avoids the client having
|
|
/// to pass in a MCExpr for constant integers.
|
|
virtual void EmitIntValue(uint64_t Value, unsigned Size);
|
|
|
|
virtual void EmitULEB128Value(const MCExpr *Value);
|
|
|
|
virtual void EmitSLEB128Value(const MCExpr *Value);
|
|
|
|
/// \brief Special case of EmitULEB128Value that avoids the client having to
|
|
/// pass in a MCExpr for constant integers.
|
|
void EmitULEB128IntValue(uint64_t Value, unsigned Padding = 0);
|
|
|
|
/// \brief Special case of EmitSLEB128Value that avoids the client having to
|
|
/// pass in a MCExpr for constant integers.
|
|
void EmitSLEB128IntValue(int64_t Value);
|
|
|
|
/// \brief Special case of EmitValue that avoids the client having to pass in
|
|
/// a MCExpr for MCSymbols.
|
|
void EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
|
|
bool IsSectionRelative = false);
|
|
|
|
/// \brief Emit the expression \p Value into the output as a gprel64 (64-bit
|
|
/// GP relative) value.
|
|
///
|
|
/// This is used to implement assembler directives such as .gpdword on
|
|
/// targets that support them.
|
|
virtual void EmitGPRel64Value(const MCExpr *Value);
|
|
|
|
/// \brief Emit the expression \p Value into the output as a gprel32 (32-bit
|
|
/// GP relative) value.
|
|
///
|
|
/// This is used to implement assembler directives such as .gprel32 on
|
|
/// targets that support them.
|
|
virtual void EmitGPRel32Value(const MCExpr *Value);
|
|
|
|
/// \brief Emit NumBytes bytes worth of the value specified by FillValue.
|
|
/// This implements directives such as '.space'.
|
|
virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue);
|
|
|
|
/// \brief Emit NumBytes worth of zeros.
|
|
/// This function properly handles data in virtual sections.
|
|
virtual void EmitZeros(uint64_t NumBytes);
|
|
|
|
/// \brief Emit some number of copies of \p Value until the byte alignment \p
|
|
/// ByteAlignment is reached.
|
|
///
|
|
/// If the number of bytes need to emit for the alignment is not a multiple
|
|
/// of \p ValueSize, then the contents of the emitted fill bytes is
|
|
/// undefined.
|
|
///
|
|
/// This used to implement the .align assembler directive.
|
|
///
|
|
/// \param ByteAlignment - The alignment to reach. This must be a power of
|
|
/// two on some targets.
|
|
/// \param Value - The value to use when filling bytes.
|
|
/// \param ValueSize - The size of the integer (in bytes) to emit for
|
|
/// \p Value. This must match a native machine width.
|
|
/// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
|
|
/// the alignment cannot be reached in this many bytes, no bytes are
|
|
/// emitted.
|
|
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
|
|
unsigned ValueSize = 1,
|
|
unsigned MaxBytesToEmit = 0);
|
|
|
|
/// \brief Emit nops until the byte alignment \p ByteAlignment is reached.
|
|
///
|
|
/// This used to align code where the alignment bytes may be executed. This
|
|
/// can emit different bytes for different sizes to optimize execution.
|
|
///
|
|
/// \param ByteAlignment - The alignment to reach. This must be a power of
|
|
/// two on some targets.
|
|
/// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
|
|
/// the alignment cannot be reached in this many bytes, no bytes are
|
|
/// emitted.
|
|
virtual void EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit = 0);
|
|
|
|
/// \brief Emit some number of copies of \p Value until the byte offset \p
|
|
/// Offset is reached.
|
|
///
|
|
/// This is used to implement assembler directives such as .org.
|
|
///
|
|
/// \param Offset - The offset to reach. This may be an expression, but the
|
|
/// expression must be associated with the current section.
|
|
/// \param Value - The value to use when filling bytes.
|
|
/// \return false on success, true if the offset was invalid.
|
|
virtual bool EmitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value = 0);
|
|
|
|
/// @}
|
|
|
|
/// \brief Switch to a new logical file. This is used to implement the '.file
|
|
/// "foo.c"' assembler directive.
|
|
virtual void EmitFileDirective(StringRef Filename);
|
|
|
|
/// \brief Emit the "identifiers" directive. This implements the
|
|
/// '.ident "version foo"' assembler directive.
|
|
virtual void EmitIdent(StringRef IdentString) {}
|
|
|
|
/// \brief Associate a filename with a specified logical file number. This
|
|
/// implements the DWARF2 '.file 4 "foo.c"' assembler directive.
|
|
virtual unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
|
|
StringRef Filename,
|
|
unsigned CUID = 0);
|
|
|
|
/// \brief This implements the DWARF2 '.loc fileno lineno ...' assembler
|
|
/// directive.
|
|
virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
|
|
unsigned Column, unsigned Flags,
|
|
unsigned Isa, unsigned Discriminator,
|
|
StringRef FileName);
|
|
|
|
/// Emit the absolute difference between two symbols if possible.
|
|
///
|
|
/// \pre Offset of \c Hi is greater than the offset \c Lo.
|
|
/// \return true on success.
|
|
virtual bool emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
|
|
unsigned Size) {
|
|
return false;
|
|
}
|
|
|
|
virtual MCSymbol *getDwarfLineTableSymbol(unsigned CUID);
|
|
virtual void EmitCFISections(bool EH, bool Debug);
|
|
void EmitCFIStartProc(bool IsSimple);
|
|
void EmitCFIEndProc();
|
|
virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
|
|
virtual void EmitCFIDefCfaOffset(int64_t Offset);
|
|
virtual void EmitCFIDefCfaRegister(int64_t Register);
|
|
virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
|
|
virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
|
|
virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
|
|
virtual void EmitCFIRememberState();
|
|
virtual void EmitCFIRestoreState();
|
|
virtual void EmitCFISameValue(int64_t Register);
|
|
virtual void EmitCFIRestore(int64_t Register);
|
|
virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
|
|
virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
|
|
virtual void EmitCFIEscape(StringRef Values);
|
|
virtual void EmitCFISignalFrame();
|
|
virtual void EmitCFIUndefined(int64_t Register);
|
|
virtual void EmitCFIRegister(int64_t Register1, int64_t Register2);
|
|
virtual void EmitCFIWindowSave();
|
|
|
|
virtual void EmitWinCFIStartProc(const MCSymbol *Symbol);
|
|
virtual void EmitWinCFIEndProc();
|
|
virtual void EmitWinCFIStartChained();
|
|
virtual void EmitWinCFIEndChained();
|
|
virtual void EmitWinCFIPushReg(unsigned Register);
|
|
virtual void EmitWinCFISetFrame(unsigned Register, unsigned Offset);
|
|
virtual void EmitWinCFIAllocStack(unsigned Size);
|
|
virtual void EmitWinCFISaveReg(unsigned Register, unsigned Offset);
|
|
virtual void EmitWinCFISaveXMM(unsigned Register, unsigned Offset);
|
|
virtual void EmitWinCFIPushFrame(bool Code);
|
|
virtual void EmitWinCFIEndProlog();
|
|
|
|
virtual void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except);
|
|
virtual void EmitWinEHHandlerData();
|
|
|
|
/// \brief Emit the given \p Instruction into the current section.
|
|
virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI);
|
|
|
|
/// \brief Set the bundle alignment mode from now on in the section.
|
|
/// The argument is the power of 2 to which the alignment is set. The
|
|
/// value 0 means turn the bundle alignment off.
|
|
virtual void EmitBundleAlignMode(unsigned AlignPow2);
|
|
|
|
/// \brief The following instructions are a bundle-locked group.
|
|
///
|
|
/// \param AlignToEnd - If true, the bundle-locked group will be aligned to
|
|
/// the end of a bundle.
|
|
virtual void EmitBundleLock(bool AlignToEnd);
|
|
|
|
/// \brief Ends a bundle-locked group.
|
|
virtual void EmitBundleUnlock();
|
|
|
|
/// \brief If this file is backed by a assembly streamer, this dumps the
|
|
/// specified string in the output .s file. This capability is indicated by
|
|
/// the hasRawTextSupport() predicate. By default this aborts.
|
|
void EmitRawText(const Twine &String);
|
|
|
|
/// \brief Causes any cached state to be written out.
|
|
virtual void Flush() {}
|
|
|
|
/// \brief Streamer specific finalization.
|
|
virtual void FinishImpl();
|
|
/// \brief Finish emission of machine code.
|
|
void Finish();
|
|
|
|
virtual bool mayHaveInstructions(MCSection &Sec) const { return true; }
|
|
};
|
|
|
|
/// Create a dummy machine code streamer, which does nothing. This is useful for
|
|
/// timing the assembler front end.
|
|
MCStreamer *createNullStreamer(MCContext &Ctx);
|
|
|
|
/// Create a machine code streamer which will print out assembly for the native
|
|
/// target, suitable for compiling with a native assembler.
|
|
///
|
|
/// \param InstPrint - If given, the instruction printer to use. If not given
|
|
/// the MCInst representation will be printed. This method takes ownership of
|
|
/// InstPrint.
|
|
///
|
|
/// \param CE - If given, a code emitter to use to show the instruction
|
|
/// encoding inline with the assembly. This method takes ownership of \p CE.
|
|
///
|
|
/// \param TAB - If given, a target asm backend to use to show the fixup
|
|
/// information in conjunction with encoding information. This method takes
|
|
/// ownership of \p TAB.
|
|
///
|
|
/// \param ShowInst - Whether to show the MCInst representation inline with
|
|
/// the assembly.
|
|
MCStreamer *createAsmStreamer(MCContext &Ctx,
|
|
std::unique_ptr<formatted_raw_ostream> OS,
|
|
bool isVerboseAsm, bool useDwarfDirectory,
|
|
MCInstPrinter *InstPrint, MCCodeEmitter *CE,
|
|
MCAsmBackend *TAB, bool ShowInst);
|
|
} // end namespace llvm
|
|
|
|
#endif
|