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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/MCObjectFileInfo.h"
#include "llvm/MC/SectionKind.h"
namespace llvm {
class MachineModuleInfo;
class Mangler;
class MCAsmInfo;
class MCContext;
class MCExpr;
class MCSection;
class MCSectionMachO;
class MCSymbol;
class MCStreamer;
class GlobalValue;
class TargetMachine;
class TargetLoweringObjectFile : public MCObjectFileInfo {
MCContext *Ctx;
TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
public:
MCContext &getContext() const { return *Ctx; }
TargetLoweringObjectFile() : MCObjectFileInfo(), Ctx(0) {}
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);
virtual void emitPersonalityValue(MCStreamer &Streamer,
const TargetMachine &TM,
const MCSymbol *Sym) 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 {
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;
}
/// 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;
// getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
virtual MCSymbol *
getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI) const;
///
const MCExpr *
getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
MCStreamer &Streamer) const;
virtual unsigned getPersonalityEncoding() const;
virtual unsigned getLSDAEncoding() const;
virtual unsigned getFDEEncoding(bool CFI) 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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