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https://github.com/c64scene-ar/llvm-6502.git
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d5bbb07ec8
getLSDASection() to be more specific. This makes it pretty obvious that the ELF LSDA section is being specified wrong in PIC mode. We're probably getting a lot of startup-time relocations to a readonly page, which is expensive and bad. Someone who cares about ELF C++ should investigate this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77847 91177308-0d34-0410-b5e6-96231b3b80d8
236 lines
8.5 KiB
C++
236 lines
8.5 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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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/MC/SectionKind.h"
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namespace llvm {
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class MCSection;
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class MCContext;
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class GlobalValue;
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class Mangler;
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class TargetMachine;
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class TargetLoweringObjectFile {
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MCContext *Ctx;
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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 MCSection *TextSection;
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/// DataSection - Section directive for standard data.
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///
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const MCSection *DataSection;
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/// BSSSection - Section that is default initialized to zero.
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const MCSection *BSSSection;
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/// ReadOnlySection - Section that is readonly and can contain arbitrary
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/// initialized data. Targets are not required to have a readonly section.
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/// If they don't, various bits of code will fall back to using the data
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/// section for constants.
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const MCSection *ReadOnlySection;
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/// StaticCtorSection - This section contains the static constructor pointer
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/// list.
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const MCSection *StaticCtorSection;
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/// StaticDtorSection - This section contains the static destructor pointer
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/// list.
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const MCSection *StaticDtorSection;
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/// LSDASection - If exception handling is supported by the target, this is
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/// the section the Language Specific Data Area information is emitted to.
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const MCSection *LSDASection;
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public:
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// FIXME: NONPUB.
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const MCSection *getOrCreateSection(const char *Name,
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bool isDirective,
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SectionKind K) const;
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public:
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virtual ~TargetLoweringObjectFile();
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/// Initialize - this method must be called before any actual lowering is
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/// done. This specifies the current context for codegen, and gives the
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/// lowering implementations a chance to set up their default sections.
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virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
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Ctx = &ctx;
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}
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const MCSection *getTextSection() const { return TextSection; }
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const MCSection *getDataSection() const { return DataSection; }
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const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
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const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
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const MCSection *getLSDASection() const { return LSDASection; }
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/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
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/// decide not to emit the UsedDirective for some symbols in llvm.used.
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/// FIXME: REMOVE this (rdar://7071300)
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virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
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Mangler *) const {
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return GV != 0;
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}
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/// getSectionForConstant - Given a constant with the SectionKind, return a
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/// section that it should be placed in.
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virtual const MCSection *getSectionForConstant(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 getKindForNamedSection(const char *Section,
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SectionKind 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 MCSection *SectionForGlobal(const GlobalValue *GV,
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Mangler *Mang,
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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 MCSection *
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getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
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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 MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, 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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bool HasCrazyBSS;
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protected:
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/// TLSDataSection - Section directive for Thread Local data.
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///
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const MCSection *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 MCSection *TLSBSSSection; // Defaults to ".tbss".
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const MCSection *CStringSection;
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const MCSection *DataRelSection;
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const MCSection *DataRelLocalSection;
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const MCSection *DataRelROSection;
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const MCSection *DataRelROLocalSection;
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const MCSection *MergeableConst4Section;
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const MCSection *MergeableConst8Section;
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const MCSection *MergeableConst16Section;
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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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: AtIsCommentChar(atIsCommentChar), HasCrazyBSS(hasCrazyBSS) {}
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
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/// getSectionForConstant - Given a constant with the SectionKind, return a
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/// section that it should be placed in.
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virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
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virtual SectionKind getKindForNamedSection(const char *Section,
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SectionKind K) const;
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void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const;
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virtual const MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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};
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class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
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const MCSection *CStringSection;
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const MCSection *TextCoalSection;
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const MCSection *ConstTextCoalSection;
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const MCSection *ConstDataCoalSection;
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const MCSection *ConstDataSection;
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const MCSection *DataCoalSection;
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const MCSection *FourByteConstantSection;
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const MCSection *EightByteConstantSection;
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const MCSection *SixteenByteConstantSection;
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public:
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
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virtual const MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
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/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
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/// decide not to emit the UsedDirective for some symbols in llvm.used.
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/// FIXME: REMOVE this (rdar://7071300)
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virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
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Mangler *) const;
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};
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class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
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public:
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
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virtual void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const;
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virtual const MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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};
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} // end namespace llvm
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#endif
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