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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
// FIXME: Switch to MC.
#include "llvm/Target/TargetAsmInfo.h"
namespace llvm {
class TargetLoweringObjectFile {
private:
mutable StringMap<Section> Sections;
protected:
TargetLoweringObjectFile();
/// TextSection - Section directive for standard text.
///
const Section *TextSection; // Defaults to ".text".
/// DataSection - Section directive for standard data.
///
const Section *DataSection; // Defaults to ".data".
// FIXME: SINK THESE.
const Section *BSSSection_;
/// ReadOnlySection - This is the directive that is emitted to switch to a
/// read-only section for constant data (e.g. data declared const,
/// jump tables).
const Section *ReadOnlySection; // Defaults to NULL
/// TLSDataSection - Section directive for Thread Local data.
///
const Section *TLSDataSection; // Defaults to ".tdata".
/// TLSBSSSection - Section directive for Thread Local uninitialized data.
/// Null if this target doesn't support a BSS section.
///
const Section *TLSBSSSection; // Defaults to ".tbss".
const Section *CStringSection_;
public:
// FIXME: NONPUB.
const Section *getOrCreateSection(const char *Name,
bool isDirective,
SectionKind::Kind K) const;
public:
virtual ~TargetLoweringObjectFile();
const Section *getTextSection() const { return TextSection; }
const Section *getDataSection() const { return DataSection; }
/// getSectionForMergeableConstant - Given a mergeable constant with the
/// specified size and relocation information, return a section that it
/// should be placed in.
virtual const Section *
getSectionForMergeableConstant(SectionKind Kind) const;
/// getKindForNamedSection - If this target wants to be able to override
/// section flags based on the name of the section specified for a global
/// variable, it can implement this. This is used on ELF systems so that
/// ".tbss" gets the TLS bit set etc.
virtual SectionKind::Kind getKindForNamedSection(const char *Section,
SectionKind::Kind K) const{
return K;
}
/// 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 Section *SectionForGlobal(const GlobalValue *GV,
const TargetMachine &TM) const;
/// getSpecialCasedSectionGlobals - Allow the target to completely override
/// section assignment of a global.
/// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
/// getFlagsForNamedSection.
virtual const Section *
getSpecialCasedSectionGlobals(const GlobalValue *GV,
SectionKind Kind) const {
return 0;
}
/// getSectionFlagsAsString - Turn the flags in the specified SectionKind
/// into a string that can be printed to the assembly file after the
/// ".section foo" part of a section directive.
virtual void getSectionFlagsAsString(SectionKind Kind,
SmallVectorImpl<char> &Str) const {
}
protected:
virtual const Section *SelectSectionForGlobal(const GlobalValue *GV,
SectionKind Kind,
const TargetMachine &TM) const;
};
class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
bool AtIsCommentChar; // True if @ is the comment character on this target.
public:
/// ELF Constructor - AtIsCommentChar is true if the CommentCharacter from TAI
/// is "@".
TargetLoweringObjectFileELF(bool AtIsCommentChar = false,
// FIXME: REMOVE AFTER UNIQUING IS FIXED.
bool HasCrazyBSS = false);
/// getSectionForMergeableConstant - Given a mergeable constant with the
/// specified size and relocation information, return a section that it
/// should be placed in.
virtual const Section *
getSectionForMergeableConstant(SectionKind Kind) const;
virtual SectionKind::Kind getKindForNamedSection(const char *Section,
SectionKind::Kind K) const;
void getSectionFlagsAsString(SectionKind Kind,
SmallVectorImpl<char> &Str) const;
virtual const Section* SelectSectionForGlobal(const GlobalValue *GV,
SectionKind Kind,
const TargetMachine &TM) const;
protected:
const Section *DataRelSection;
const Section *DataRelLocalSection;
const Section *DataRelROSection;
const Section *DataRelROLocalSection;
const Section *MergeableConst4Section;
const Section *MergeableConst8Section;
const Section *MergeableConst16Section;
};
class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
const Section *TextCoalSection;
const Section *ConstTextCoalSection;
const Section *ConstDataCoalSection;
const Section *ConstDataSection;
const Section *DataCoalSection;
const Section *FourByteConstantSection;
const Section *EightByteConstantSection;
const Section *SixteenByteConstantSection;
public:
TargetLoweringObjectFileMachO();
virtual const Section *SelectSectionForGlobal(const GlobalValue *GV,
SectionKind Kind,
const TargetMachine &TM) const;
virtual const Section *
getSectionForMergeableConstant(SectionKind Kind) const;
};
class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
public:
TargetLoweringObjectFileCOFF();
virtual void getSectionFlagsAsString(SectionKind Kind,
SmallVectorImpl<char> &Str) const;
virtual const Section *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
const TargetMachine &TM) const;
};
} // end namespace llvm
#endif
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