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mode, and "ld64" (the default linker) falls back to it in -static mode. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77334 91177308-0d34-0410-b5e6-96231b3b80d8
188 lines
6.7 KiB
C++
188 lines
6.7 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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// FIXME: Switch to MC.
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#include "llvm/Target/TargetAsmInfo.h"
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namespace llvm {
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class TargetLoweringObjectFile {
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private:
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mutable StringMap<Section> Sections;
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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 Section *TextSection; // Defaults to ".text".
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/// DataSection - Section directive for standard data.
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///
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const Section *DataSection; // Defaults to ".data".
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// FIXME: SINK THESE.
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const Section *BSSSection_;
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/// ReadOnlySection - This is the directive that is emitted to switch to a
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/// read-only section for constant data (e.g. data declared const,
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/// jump tables).
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const Section *ReadOnlySection; // Defaults to NULL
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/// TLSDataSection - Section directive for Thread Local data.
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///
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const Section *TLSDataSection; // Defaults to ".tdata".
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/// TLSBSSSection - Section directive for Thread Local uninitialized data.
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/// Null if this target doesn't support a BSS section.
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///
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const Section *TLSBSSSection; // Defaults to ".tbss".
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const Section *CStringSection_;
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public:
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// FIXME: NONPUB.
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const Section *getOrCreateSection(const char *Name,
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bool isDirective,
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SectionKind::Kind K) const;
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public:
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virtual ~TargetLoweringObjectFile();
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const Section *getTextSection() const { return TextSection; }
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const Section *getDataSection() const { return DataSection; }
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/// getSectionForMergeableConstant - Given a mergeable constant with the
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/// specified size and relocation information, return a section that it
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/// should be placed in.
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virtual const Section *
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getSectionForMergeableConstant(SectionKind Kind) const;
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/// getKindForNamedSection - If this target wants to be able to override
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/// section flags based on the name of the section specified for a global
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/// variable, it can implement this. This is used on ELF systems so that
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/// ".tbss" gets the TLS bit set etc.
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virtual SectionKind::Kind getKindForNamedSection(const char *Section,
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SectionKind::Kind K) const{
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return K;
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}
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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 Section *SectionForGlobal(const GlobalValue *GV,
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const TargetMachine &TM) const;
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/// getSpecialCasedSectionGlobals - Allow the target to completely override
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/// section assignment of a global.
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/// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
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/// getFlagsForNamedSection.
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virtual const Section *
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getSpecialCasedSectionGlobals(const GlobalValue *GV,
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SectionKind Kind) const {
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return 0;
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}
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/// getSectionFlagsAsString - Turn the flags in the specified SectionKind
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/// into a string that can be printed to the assembly file after the
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/// ".section foo" part of a section directive.
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virtual void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const {
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}
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protected:
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virtual const Section *SelectSectionForGlobal(const GlobalValue *GV,
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SectionKind Kind,
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const TargetMachine &TM) const;
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};
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class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
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bool AtIsCommentChar; // True if @ is the comment character on this target.
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public:
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/// ELF Constructor - AtIsCommentChar is true if the CommentCharacter from TAI
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/// is "@".
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TargetLoweringObjectFileELF(bool AtIsCommentChar = false,
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// FIXME: REMOVE AFTER UNIQUING IS FIXED.
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bool HasCrazyBSS = false);
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/// getSectionForMergeableConstant - Given a mergeable constant with the
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/// specified size and relocation information, return a section that it
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/// should be placed in.
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virtual const Section *
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getSectionForMergeableConstant(SectionKind Kind) const;
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virtual SectionKind::Kind getKindForNamedSection(const char *Section,
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SectionKind::Kind K) const;
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void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const;
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virtual const Section* SelectSectionForGlobal(const GlobalValue *GV,
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SectionKind Kind,
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const TargetMachine &TM) const;
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protected:
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const Section *DataRelSection;
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const Section *DataRelLocalSection;
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const Section *DataRelROSection;
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const Section *DataRelROLocalSection;
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const Section *MergeableConst4Section;
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const Section *MergeableConst8Section;
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const Section *MergeableConst16Section;
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};
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class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
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const Section *TextCoalSection;
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const Section *ConstTextCoalSection;
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const Section *ConstDataCoalSection;
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const Section *ConstDataSection;
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const Section *DataCoalSection;
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const Section *FourByteConstantSection;
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const Section *EightByteConstantSection;
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const Section *SixteenByteConstantSection;
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public:
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TargetLoweringObjectFileMachO(const TargetMachine &TM);
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virtual const Section *SelectSectionForGlobal(const GlobalValue *GV,
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SectionKind Kind,
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const TargetMachine &TM) const;
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virtual const Section *
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getSectionForMergeableConstant(SectionKind Kind) const;
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};
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class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
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public:
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TargetLoweringObjectFileCOFF();
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virtual void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const;
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virtual const Section *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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const TargetMachine &TM) const;
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};
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} // end namespace llvm
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#endif
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