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//==-- llvm/CodeGen/TargetLoweringObjectFileImpl.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_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
#define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
namespace llvm {
class MachineModuleInfo;
class Mangler;
class MCAsmInfo;
class MCExpr;
class MCSection;
class MCSectionMachO;
class MCSymbol;
class MCContext;
class GlobalValue;
class TargetMachine;
class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
protected:
/// TLSDataSection - Section directive for Thread Local data.
///
const MCSection *TLSDataSection; // Defaults to ".tdata".
/// TLSBSSSection - Section directive for Thread Local uninitialized data.
/// Null if this target doesn't support a BSS section.
///
const MCSection *TLSBSSSection; // Defaults to ".tbss".
const MCSection *DataRelSection;
const MCSection *DataRelLocalSection;
const MCSection *DataRelROSection;
const MCSection *DataRelROLocalSection;
const MCSection *MergeableConst4Section;
const MCSection *MergeableConst8Section;
const MCSection *MergeableConst16Section;
protected:
const MCSection *getELFSection(StringRef Section, unsigned Type,
unsigned Flags, SectionKind Kind,
bool IsExplicit = false) const;
public:
TargetLoweringObjectFileELF() {}
~TargetLoweringObjectFileELF() {}
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
const MCSection *getDataRelSection() const { return DataRelSection; }
/// getSectionForConstant - Given a constant with the SectionKind, return a
/// section that it should be placed in.
virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
virtual const MCSection *
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
/// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
/// to the specified global variable from exception handling information.
///
virtual const MCExpr *
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI, unsigned Encoding,
MCStreamer &Streamer) const;
};
class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
const MCSection *CStringSection;
const MCSection *UStringSection;
const MCSection *TextCoalSection;
const MCSection *ConstTextCoalSection;
const MCSection *ConstDataCoalSection;
const MCSection *ConstDataSection;
const MCSection *DataCoalSection;
const MCSection *DataCommonSection;
const MCSection *DataBSSSection;
const MCSection *FourByteConstantSection;
const MCSection *EightByteConstantSection;
const MCSection *SixteenByteConstantSection;
const MCSection *LazySymbolPointerSection;
const MCSection *NonLazySymbolPointerSection;
public:
TargetLoweringObjectFileMachO() {}
~TargetLoweringObjectFileMachO() {}
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
/// 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;
/// getTextCoalSection - Return the "__TEXT,__textcoal_nt" section we put weak
/// text symbols into.
const MCSection *getTextCoalSection() const {
return TextCoalSection;
}
/// getConstTextCoalSection - Return the "__TEXT,__const_coal" section
/// we put weak read-only symbols into.
const MCSection *getConstTextCoalSection() const {
return ConstTextCoalSection;
}
/// getLazySymbolPointerSection - Return the section corresponding to
/// the .lazy_symbol_pointer directive.
const MCSection *getLazySymbolPointerSection() const {
return LazySymbolPointerSection;
}
/// getNonLazySymbolPointerSection - Return the section corresponding to
/// the .non_lazy_symbol_pointer directive.
const MCSection *getNonLazySymbolPointerSection() const {
return NonLazySymbolPointerSection;
}
/// getExprForDwarfGlobalReference - The mach-o version of this method
/// defaults to returning a stub reference.
virtual const MCExpr *
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI, unsigned Encoding,
MCStreamer &Streamer) const;
virtual unsigned getPersonalityEncoding() const;
virtual unsigned getLSDAEncoding() const;
virtual unsigned getFDEEncoding() const;
virtual unsigned getTTypeEncoding() const;
};
class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
mutable void *UniquingMap;
public:
TargetLoweringObjectFileCOFF() : UniquingMap(0) {}
~TargetLoweringObjectFileCOFF();
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
/// getCOFFSection - Return the MCSection for the specified COFF section.
/// FIXME: Switch this to a semantic view eventually.
const MCSection *getCOFFSection(StringRef Name, bool isDirective,
SectionKind K) const;
};
} // end namespace llvm
#endif
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