229 lines
9.0 KiB
C++
229 lines
9.0 KiB
C++
//===-- llvm/Target/TargetLoweringObjectFile.h - Object Info ----*- 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 implements classes used to handle lowerings specific to common
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// object file formats.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
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#define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/SectionKind.h"
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namespace llvm {
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class MachineModuleInfo;
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class Mangler;
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class MCAsmInfo;
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class MCContext;
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class MCExpr;
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class MCSection;
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class MCSectionMachO;
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class MCSymbol;
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class MCStreamer;
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class GlobalValue;
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class TargetMachine;
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class TargetLoweringObjectFile {
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MCContext *Ctx;
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TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
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void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
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protected:
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TargetLoweringObjectFile();
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/// TextSection - Section directive for standard text.
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///
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const MCSection *TextSection;
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/// DataSection - Section directive for standard data.
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///
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const MCSection *DataSection;
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/// BSSSection - Section that is default initialized to zero.
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const MCSection *BSSSection;
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/// ReadOnlySection - Section that is readonly and can contain arbitrary
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/// initialized data. Targets are not required to have a readonly section.
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/// If they don't, various bits of code will fall back to using the data
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/// section for constants.
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const MCSection *ReadOnlySection;
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/// StaticCtorSection - This section contains the static constructor pointer
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/// list.
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const MCSection *StaticCtorSection;
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/// StaticDtorSection - This section contains the static destructor pointer
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/// list.
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const MCSection *StaticDtorSection;
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/// LSDASection - If exception handling is supported by the target, this is
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/// the section the Language Specific Data Area information is emitted to.
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const MCSection *LSDASection;
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/// EHFrameSection - If exception handling is supported by the target, this is
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/// the section the EH Frame is emitted to.
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const MCSection *EHFrameSection;
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// Dwarf sections for debug info. If a target supports debug info, these must
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// be set.
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const MCSection *DwarfAbbrevSection;
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const MCSection *DwarfInfoSection;
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const MCSection *DwarfLineSection;
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const MCSection *DwarfFrameSection;
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const MCSection *DwarfPubNamesSection;
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const MCSection *DwarfPubTypesSection;
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const MCSection *DwarfDebugInlineSection;
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const MCSection *DwarfStrSection;
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const MCSection *DwarfLocSection;
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const MCSection *DwarfARangesSection;
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const MCSection *DwarfRangesSection;
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const MCSection *DwarfMacroInfoSection;
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/// SupportsWeakEmptyEHFrame - True if target object file supports a
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/// weak_definition of constant 0 for an omitted EH frame.
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bool SupportsWeakOmittedEHFrame;
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/// IsFunctionEHSymbolGlobal - This flag is set to true if the ".eh" symbol
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/// for a function should be marked .globl.
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bool IsFunctionEHSymbolGlobal;
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/// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
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/// "EH_frame" symbol for EH information should be an assembler temporary (aka
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/// private linkage, aka an L or .L label) or false if it should be a normal
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/// non-.globl label. This defaults to true.
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bool IsFunctionEHFrameSymbolPrivate;
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public:
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MCContext &getContext() const { return *Ctx; }
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virtual ~TargetLoweringObjectFile();
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/// Initialize - this method must be called before any actual lowering is
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/// done. This specifies the current context for codegen, and gives the
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/// lowering implementations a chance to set up their default sections.
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virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
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Ctx = &ctx;
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}
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bool isFunctionEHSymbolGlobal() const {
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return IsFunctionEHSymbolGlobal;
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}
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bool isFunctionEHFrameSymbolPrivate() const {
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return IsFunctionEHFrameSymbolPrivate;
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}
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bool getSupportsWeakOmittedEHFrame() const {
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return SupportsWeakOmittedEHFrame;
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}
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const MCSection *getTextSection() const { return TextSection; }
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const MCSection *getDataSection() const { return DataSection; }
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const MCSection *getBSSSection() const { return BSSSection; }
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const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
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const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
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const MCSection *getLSDASection() const { return LSDASection; }
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const MCSection *getEHFrameSection() const { return EHFrameSection; }
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const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
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const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
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const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
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const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
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const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
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const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
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const MCSection *getDwarfDebugInlineSection() const {
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return DwarfDebugInlineSection;
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}
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const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
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const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
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const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
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const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
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const MCSection *getDwarfMacroInfoSection() const {
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return DwarfMacroInfoSection;
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}
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/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
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/// decide not to emit the UsedDirective for some symbols in llvm.used.
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/// FIXME: REMOVE this (rdar://7071300)
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virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
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Mangler *) const {
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return GV != 0;
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}
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/// getSectionForConstant - Given a constant with the SectionKind, return a
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/// section that it should be placed in.
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virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
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/// getKindForGlobal - Classify the specified global variable into a set of
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/// target independent categories embodied in SectionKind.
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static SectionKind getKindForGlobal(const GlobalValue *GV,
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const TargetMachine &TM);
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/// SectionForGlobal - This method computes the appropriate section to emit
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/// the specified global variable or function definition. This should not
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/// be passed external (or available externally) globals.
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const MCSection *SectionForGlobal(const GlobalValue *GV,
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SectionKind Kind, Mangler *Mang,
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const TargetMachine &TM) const;
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/// SectionForGlobal - This method computes the appropriate section to emit
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/// the specified global variable or function definition. This should not
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/// be passed external (or available externally) globals.
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const MCSection *SectionForGlobal(const GlobalValue *GV,
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Mangler *Mang,
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const TargetMachine &TM) const {
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return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
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}
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/// getExplicitSectionGlobal - Targets should implement this method to assign
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/// a section to globals with an explicit section specfied. The
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/// implementation of this method can assume that GV->hasSection() is true.
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virtual const MCSection *
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getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const = 0;
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/// getSpecialCasedSectionGlobals - Allow the target to completely override
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/// section assignment of a global.
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virtual const MCSection *
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getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
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SectionKind Kind) const {
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return 0;
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}
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/// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
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/// to the specified global variable from exception handling information.
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///
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virtual const MCExpr *
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getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
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MachineModuleInfo *MMI, unsigned Encoding,
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MCStreamer &Streamer) const;
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///
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const MCExpr *
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getExprForDwarfReference(const MCSymbol *Sym, Mangler *Mang,
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MachineModuleInfo *MMI, unsigned Encoding,
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MCStreamer &Streamer) const;
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virtual unsigned getPersonalityEncoding() const;
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virtual unsigned getLSDAEncoding() const;
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virtual unsigned getFDEEncoding() const;
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virtual unsigned getTTypeEncoding() const;
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protected:
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virtual const MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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};
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} // end namespace llvm
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#endif
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