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