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/MC/SectionKind.h"
30 class TargetLoweringObjectFile {
33 TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
34 void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
37 TargetLoweringObjectFile();
39 /// TextSection - Section directive for standard text.
41 const MCSection *TextSection;
43 /// DataSection - Section directive for standard data.
45 const MCSection *DataSection;
47 /// BSSSection - Section that is default initialized to zero.
48 const MCSection *BSSSection;
50 /// ReadOnlySection - Section that is readonly and can contain arbitrary
51 /// initialized data. Targets are not required to have a readonly section.
52 /// If they don't, various bits of code will fall back to using the data
53 /// section for constants.
54 const MCSection *ReadOnlySection;
56 /// StaticCtorSection - This section contains the static constructor pointer
58 const MCSection *StaticCtorSection;
60 /// StaticDtorSection - This section contains the static destructor pointer
62 const MCSection *StaticDtorSection;
64 /// LSDASection - If exception handling is supported by the target, this is
65 /// the section the Language Specific Data Area information is emitted to.
66 const MCSection *LSDASection;
68 /// EHFrameSection - If exception handling is supported by the target, this is
69 /// the section the EH Frame is emitted to.
70 const MCSection *EHFrameSection;
72 // Dwarf sections for debug info. If a target supports debug info, these must
74 const MCSection *DwarfAbbrevSection;
75 const MCSection *DwarfInfoSection;
76 const MCSection *DwarfLineSection;
77 const MCSection *DwarfFrameSection;
78 const MCSection *DwarfPubNamesSection;
79 const MCSection *DwarfPubTypesSection;
80 const MCSection *DwarfDebugInlineSection;
81 const MCSection *DwarfStrSection;
82 const MCSection *DwarfLocSection;
83 const MCSection *DwarfARangesSection;
84 const MCSection *DwarfRangesSection;
85 const MCSection *DwarfMacroInfoSection;
89 MCContext &getContext() const { return *Ctx; }
92 virtual ~TargetLoweringObjectFile();
94 /// Initialize - this method must be called before any actual lowering is
95 /// done. This specifies the current context for codegen, and gives the
96 /// lowering implementations a chance to set up their default sections.
97 virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
102 const MCSection *getTextSection() const { return TextSection; }
103 const MCSection *getDataSection() const { return DataSection; }
104 const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
105 const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
106 const MCSection *getLSDASection() const { return LSDASection; }
107 const MCSection *getEHFrameSection() const { return EHFrameSection; }
108 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
109 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
110 const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
111 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
112 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
113 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
114 const MCSection *getDwarfDebugInlineSection() const {
115 return DwarfDebugInlineSection;
117 const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
118 const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
119 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
120 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
121 const MCSection *getDwarfMacroInfoSection() const {
122 return DwarfMacroInfoSection;
125 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
126 /// decide not to emit the UsedDirective for some symbols in llvm.used.
127 /// FIXME: REMOVE this (rdar://7071300)
128 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
133 /// getSectionForConstant - Given a constant with the SectionKind, return a
134 /// section that it should be placed in.
135 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
137 /// getKindForGlobal - Classify the specified global variable into a set of
138 /// target independent categories embodied in SectionKind.
139 static SectionKind getKindForGlobal(const GlobalValue *GV,
140 const TargetMachine &TM);
142 /// SectionForGlobal - This method computes the appropriate section to emit
143 /// the specified global variable or function definition. This should not
144 /// be passed external (or available externally) globals.
145 const MCSection *SectionForGlobal(const GlobalValue *GV,
146 SectionKind Kind, Mangler *Mang,
147 const TargetMachine &TM) const;
149 /// SectionForGlobal - This method computes the appropriate section to emit
150 /// the specified global variable or function definition. This should not
151 /// be passed external (or available externally) globals.
152 const MCSection *SectionForGlobal(const GlobalValue *GV,
154 const TargetMachine &TM) const {
155 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
160 /// getExplicitSectionGlobal - Targets should implement this method to assign
161 /// a section to globals with an explicit section specfied. The
162 /// implementation of this method can assume that GV->hasSection() is true.
163 virtual const MCSection *
164 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
165 Mangler *Mang, const TargetMachine &TM) const = 0;
167 /// getSpecialCasedSectionGlobals - Allow the target to completely override
168 /// section assignment of a global.
169 virtual const MCSection *
170 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
171 SectionKind Kind) const {
176 virtual const MCSection *
177 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
178 Mangler *Mang, const TargetMachine &TM) const;
184 class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
187 /// TLSDataSection - Section directive for Thread Local data.
189 const MCSection *TLSDataSection; // Defaults to ".tdata".
191 /// TLSBSSSection - Section directive for Thread Local uninitialized data.
192 /// Null if this target doesn't support a BSS section.
194 const MCSection *TLSBSSSection; // Defaults to ".tbss".
196 const MCSection *DataRelSection;
197 const MCSection *DataRelLocalSection;
198 const MCSection *DataRelROSection;
199 const MCSection *DataRelROLocalSection;
201 const MCSection *MergeableConst4Section;
202 const MCSection *MergeableConst8Section;
203 const MCSection *MergeableConst16Section;
206 const MCSection *getELFSection(const char *Name, bool isDirective,
207 SectionKind Kind) const;
209 TargetLoweringObjectFileELF(// FIXME: REMOVE AFTER UNIQUING IS FIXED.
210 bool hasCrazyBSS = false)
211 : HasCrazyBSS(hasCrazyBSS) {}
213 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
215 /// getSectionForConstant - Given a constant with the SectionKind, return a
216 /// section that it should be placed in.
217 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
220 virtual const MCSection *
221 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
222 Mangler *Mang, const TargetMachine &TM) const;
224 virtual const MCSection *
225 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
226 Mangler *Mang, const TargetMachine &TM) const;
231 class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
232 mutable void *UniquingMap;
234 const MCSection *CStringSection;
235 const MCSection *UStringSection;
236 const MCSection *TextCoalSection;
237 const MCSection *ConstTextCoalSection;
238 const MCSection *ConstDataCoalSection;
239 const MCSection *ConstDataSection;
240 const MCSection *DataCoalSection;
241 const MCSection *FourByteConstantSection;
242 const MCSection *EightByteConstantSection;
243 const MCSection *SixteenByteConstantSection;
245 const MCSection *LazySymbolPointerSection;
246 const MCSection *NonLazySymbolPointerSection;
248 TargetLoweringObjectFileMachO() : UniquingMap(0) {}
249 ~TargetLoweringObjectFileMachO();
251 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
253 virtual const MCSection *
254 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
255 Mangler *Mang, const TargetMachine &TM) const;
257 virtual const MCSection *
258 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
259 Mangler *Mang, const TargetMachine &TM) const;
261 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
263 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
264 /// decide not to emit the UsedDirective for some symbols in llvm.used.
265 /// FIXME: REMOVE this (rdar://7071300)
266 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
269 /// getMachOSection - Return the MCSection for the specified mach-o section.
270 /// This requires the operands to be valid.
271 const MCSectionMachO *getMachOSection(const StringRef &Segment,
272 const StringRef &Section,
273 unsigned TypeAndAttributes,
274 SectionKind K) const {
275 return getMachOSection(Segment, Section, TypeAndAttributes, 0, K);
277 const MCSectionMachO *getMachOSection(const StringRef &Segment,
278 const StringRef &Section,
279 unsigned TypeAndAttributes,
281 SectionKind K) const;
283 /// getTextCoalSection - Return the "__TEXT,__textcoal_nt" section we put weak
285 const MCSection *getTextCoalSection() const {
286 return TextCoalSection;
289 /// getLazySymbolPointerSection - Return the section corresponding to
290 /// the .lazy_symbol_pointer directive.
291 const MCSection *getLazySymbolPointerSection() const {
292 return LazySymbolPointerSection;
295 /// getNonLazySymbolPointerSection - Return the section corresponding to
296 /// the .non_lazy_symbol_pointer directive.
297 const MCSection *getNonLazySymbolPointerSection() const {
298 return NonLazySymbolPointerSection;
304 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
306 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
308 virtual const MCSection *
309 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
310 Mangler *Mang, const TargetMachine &TM) const;
312 virtual const MCSection *
313 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
314 Mangler *Mang, const TargetMachine &TM) const;
316 /// getCOFFSection - Return the MCSection for the specified COFF section.
317 /// FIXME: Switch this to a semantic view eventually.
318 const MCSection *getCOFFSection(const char *Name, bool isDirective,
319 SectionKind K) const;
322 } // end namespace llvm