1 //===-- llvm/Target/TargetLoweringObjectFile.h - Object Info ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements classes used to handle lowerings specific to common
11 // object file formats.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
16 #define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/MC/SectionKind.h"
22 class MachineModuleInfo;
33 class TargetLoweringObjectFile {
36 TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
37 void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
40 TargetLoweringObjectFile();
42 /// TextSection - Section directive for standard text.
44 const MCSection *TextSection;
46 /// DataSection - Section directive for standard data.
48 const MCSection *DataSection;
50 /// BSSSection - Section that is default initialized to zero.
51 const MCSection *BSSSection;
53 /// ReadOnlySection - Section that is readonly and can contain arbitrary
54 /// initialized data. Targets are not required to have a readonly section.
55 /// If they don't, various bits of code will fall back to using the data
56 /// section for constants.
57 const MCSection *ReadOnlySection;
59 /// StaticCtorSection - This section contains the static constructor pointer
61 const MCSection *StaticCtorSection;
63 /// StaticDtorSection - This section contains the static destructor pointer
65 const MCSection *StaticDtorSection;
67 /// LSDASection - If exception handling is supported by the target, this is
68 /// the section the Language Specific Data Area information is emitted to.
69 const MCSection *LSDASection;
71 /// EHFrameSection - If exception handling is supported by the target, this is
72 /// the section the EH Frame is emitted to.
73 const MCSection *EHFrameSection;
75 // Dwarf sections for debug info. If a target supports debug info, these must
77 const MCSection *DwarfAbbrevSection;
78 const MCSection *DwarfInfoSection;
79 const MCSection *DwarfLineSection;
80 const MCSection *DwarfFrameSection;
81 const MCSection *DwarfPubNamesSection;
82 const MCSection *DwarfPubTypesSection;
83 const MCSection *DwarfDebugInlineSection;
84 const MCSection *DwarfStrSection;
85 const MCSection *DwarfLocSection;
86 const MCSection *DwarfARangesSection;
87 const MCSection *DwarfRangesSection;
88 const MCSection *DwarfMacroInfoSection;
92 MCContext &getContext() const { return *Ctx; }
95 virtual ~TargetLoweringObjectFile();
97 /// Initialize - this method must be called before any actual lowering is
98 /// done. This specifies the current context for codegen, and gives the
99 /// lowering implementations a chance to set up their default sections.
100 virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
105 const MCSection *getTextSection() const { return TextSection; }
106 const MCSection *getDataSection() const { return DataSection; }
107 const MCSection *getBSSSection() const { return BSSSection; }
108 const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
109 const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
110 const MCSection *getLSDASection() const { return LSDASection; }
111 const MCSection *getEHFrameSection() const { return EHFrameSection; }
112 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
113 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
114 const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
115 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
116 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
117 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
118 const MCSection *getDwarfDebugInlineSection() const {
119 return DwarfDebugInlineSection;
121 const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
122 const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
123 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
124 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
125 const MCSection *getDwarfMacroInfoSection() const {
126 return DwarfMacroInfoSection;
129 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
130 /// decide not to emit the UsedDirective for some symbols in llvm.used.
131 /// FIXME: REMOVE this (rdar://7071300)
132 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
137 /// getSectionForConstant - Given a constant with the SectionKind, return a
138 /// section that it should be placed in.
139 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
141 /// getKindForGlobal - Classify the specified global variable into a set of
142 /// target independent categories embodied in SectionKind.
143 static SectionKind getKindForGlobal(const GlobalValue *GV,
144 const TargetMachine &TM);
146 /// SectionForGlobal - This method computes the appropriate section to emit
147 /// the specified global variable or function definition. This should not
148 /// be passed external (or available externally) globals.
149 const MCSection *SectionForGlobal(const GlobalValue *GV,
150 SectionKind Kind, Mangler *Mang,
151 const TargetMachine &TM) const;
153 /// SectionForGlobal - This method computes the appropriate section to emit
154 /// the specified global variable or function definition. This should not
155 /// be passed external (or available externally) globals.
156 const MCSection *SectionForGlobal(const GlobalValue *GV,
158 const TargetMachine &TM) const {
159 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
164 /// getExplicitSectionGlobal - Targets should implement this method to assign
165 /// a section to globals with an explicit section specfied. The
166 /// implementation of this method can assume that GV->hasSection() is true.
167 virtual const MCSection *
168 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
169 Mangler *Mang, const TargetMachine &TM) const = 0;
171 /// getSpecialCasedSectionGlobals - Allow the target to completely override
172 /// section assignment of a global.
173 virtual const MCSection *
174 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
175 SectionKind Kind) const {
179 /// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a reference
180 /// to the specified global variable from exception handling information.
182 virtual const MCExpr *
183 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
184 MachineModuleInfo *MMI, unsigned Encoding) const;
186 virtual const MCExpr *
187 getSymbolForDwarfReference(const MCSymbol *Sym, MachineModuleInfo *MMI,
188 unsigned Encoding) const;
190 virtual unsigned getPersonalityEncoding() const;
191 virtual unsigned getLSDAEncoding() const;
192 virtual unsigned getFDEEncoding() const;
193 virtual unsigned getTTypeEncoding() const;
196 virtual const MCSection *
197 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
198 Mangler *Mang, const TargetMachine &TM) const;
201 } // end namespace llvm