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/SmallVector.h"
19 #include "llvm/ADT/StringMap.h"
20 #include "llvm/MC/SectionKind.h"
29 class TargetLoweringObjectFile {
33 TargetLoweringObjectFile();
35 /// TextSection - Section directive for standard text.
37 const MCSection *TextSection;
39 /// DataSection - Section directive for standard data.
41 const MCSection *DataSection;
43 /// BSSSection - Section that is default initialized to zero.
44 const MCSection *BSSSection;
46 /// ReadOnlySection - Section that is readonly and can contain arbitrary
47 /// initialized data. Targets are not required to have a readonly section.
48 /// If they don't, various bits of code will fall back to using the data
49 /// section for constants.
50 const MCSection *ReadOnlySection;
52 /// StaticCtorSection - This section contains the static constructor pointer
54 const MCSection *StaticCtorSection;
56 /// StaticDtorSection - This section contains the static destructor pointer
58 const MCSection *StaticDtorSection;
60 /// LSDASection - If exception handling is supported by the target, this is
61 /// the section the Language Specific Data Area information is emitted to.
62 const MCSection *LSDASection;
64 /// EHFrameSection - If exception handling is supported by the target, this is
65 /// the section the EH Frame is emitted to.
66 const MCSection *EHFrameSection;
68 // Dwarf sections for debug info. If a target supports debug info, these must
70 const MCSection *DwarfAbbrevSection;
71 const MCSection *DwarfInfoSection;
72 const MCSection *DwarfLineSection;
73 const MCSection *DwarfFrameSection;
74 const MCSection *DwarfPubNamesSection;
75 const MCSection *DwarfPubTypesSection;
76 const MCSection *DwarfDebugInlineSection;
77 const MCSection *DwarfStrSection;
78 const MCSection *DwarfLocSection;
79 const MCSection *DwarfARangesSection;
80 const MCSection *DwarfRangesSection;
81 const MCSection *DwarfMacroInfoSection;
85 const MCSection *getOrCreateSection(const char *Name,
90 virtual ~TargetLoweringObjectFile();
92 /// Initialize - this method must be called before any actual lowering is
93 /// done. This specifies the current context for codegen, and gives the
94 /// lowering implementations a chance to set up their default sections.
95 virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
100 const MCSection *getTextSection() const { return TextSection; }
101 const MCSection *getDataSection() const { return DataSection; }
102 const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
103 const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
104 const MCSection *getLSDASection() const { return LSDASection; }
105 const MCSection *getEHFrameSection() const { return EHFrameSection; }
106 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
107 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
108 const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
109 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
110 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
111 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
112 const MCSection *getDwarfDebugInlineSection() const {
113 return DwarfDebugInlineSection;
115 const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
116 const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
117 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
118 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
119 const MCSection *getDwarfMacroInfoSection() const {
120 return DwarfMacroInfoSection;
123 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
124 /// decide not to emit the UsedDirective for some symbols in llvm.used.
125 /// FIXME: REMOVE this (rdar://7071300)
126 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
131 /// getSectionForConstant - Given a constant with the SectionKind, return a
132 /// section that it should be placed in.
133 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
135 /// getKindForNamedSection - If this target wants to be able to override
136 /// section flags based on the name of the section specified for a global
137 /// variable, it can implement this. This is used on ELF systems so that
138 /// ".tbss" gets the TLS bit set etc.
139 virtual SectionKind getKindForNamedSection(const char *Section,
140 SectionKind K) const {
144 /// SectionForGlobal - This method computes the appropriate section to emit
145 /// the specified global variable or function definition. This should not
146 /// be passed external (or available externally) globals.
147 const MCSection *SectionForGlobal(const GlobalValue *GV,
149 const TargetMachine &TM) const;
151 /// getSpecialCasedSectionGlobals - Allow the target to completely override
152 /// section assignment of a global.
153 /// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
154 /// getFlagsForNamedSection.
155 virtual const MCSection *
156 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
157 SectionKind Kind) const {
161 /// getSectionFlagsAsString - Turn the flags in the specified SectionKind
162 /// into a string that can be printed to the assembly file after the
163 /// ".section foo" part of a section directive.
164 virtual void getSectionFlagsAsString(SectionKind Kind,
165 SmallVectorImpl<char> &Str) const {
169 virtual const MCSection *
170 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
171 Mangler *Mang, const TargetMachine &TM) const;
177 class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
178 bool AtIsCommentChar; // True if @ is the comment character on this target.
181 /// TLSDataSection - Section directive for Thread Local data.
183 const MCSection *TLSDataSection; // Defaults to ".tdata".
185 /// TLSBSSSection - Section directive for Thread Local uninitialized data.
186 /// Null if this target doesn't support a BSS section.
188 const MCSection *TLSBSSSection; // Defaults to ".tbss".
190 const MCSection *DataRelSection;
191 const MCSection *DataRelLocalSection;
192 const MCSection *DataRelROSection;
193 const MCSection *DataRelROLocalSection;
195 const MCSection *MergeableConst4Section;
196 const MCSection *MergeableConst8Section;
197 const MCSection *MergeableConst16Section;
199 /// ELF Constructor - AtIsCommentChar is true if the CommentCharacter from TAI
201 TargetLoweringObjectFileELF(bool atIsCommentChar = false,
202 // FIXME: REMOVE AFTER UNIQUING IS FIXED.
203 bool hasCrazyBSS = false)
204 : AtIsCommentChar(atIsCommentChar), HasCrazyBSS(hasCrazyBSS) {}
206 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
209 /// getSectionForConstant - Given a constant with the SectionKind, return a
210 /// section that it should be placed in.
211 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
213 virtual SectionKind getKindForNamedSection(const char *Section,
214 SectionKind K) const;
215 void getSectionFlagsAsString(SectionKind Kind,
216 SmallVectorImpl<char> &Str) const;
218 virtual const MCSection *
219 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
220 Mangler *Mang, const TargetMachine &TM) const;
225 class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
226 const MCSection *CStringSection;
227 const MCSection *TextCoalSection;
228 const MCSection *ConstTextCoalSection;
229 const MCSection *ConstDataCoalSection;
230 const MCSection *ConstDataSection;
231 const MCSection *DataCoalSection;
232 const MCSection *FourByteConstantSection;
233 const MCSection *EightByteConstantSection;
234 const MCSection *SixteenByteConstantSection;
237 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
239 virtual const MCSection *
240 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
241 Mangler *Mang, const TargetMachine &TM) const;
243 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
245 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
246 /// decide not to emit the UsedDirective for some symbols in llvm.used.
247 /// FIXME: REMOVE this (rdar://7071300)
248 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
251 /// getMachOSection - Return the MCSection for the specified mach-o section.
252 /// FIXME: Switch this to a semantic view eventually.
253 const MCSection *getMachOSection(const char *Name, bool isDirective,
259 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
261 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
263 virtual void getSectionFlagsAsString(SectionKind Kind,
264 SmallVectorImpl<char> &Str) const;
266 virtual const MCSection *
267 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
268 Mangler *Mang, const TargetMachine &TM) const;
270 /// getCOFFSection - Return the MCSection for the specified COFF section.
271 /// FIXME: Switch this to a semantic view eventually.
272 const MCSection *getCOFFSection(const char *Name, bool isDirective,
276 } // end namespace llvm