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 *getBSSSection() const { return BSSSection; }
105 const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
106 const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
107 const MCSection *getLSDASection() const { return LSDASection; }
108 const MCSection *getEHFrameSection() const { return EHFrameSection; }
109 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
110 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
111 const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
112 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
113 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
114 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
115 const MCSection *getDwarfDebugInlineSection() const {
116 return DwarfDebugInlineSection;
118 const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
119 const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
120 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
121 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
122 const MCSection *getDwarfMacroInfoSection() const {
123 return DwarfMacroInfoSection;
126 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
127 /// decide not to emit the UsedDirective for some symbols in llvm.used.
128 /// FIXME: REMOVE this (rdar://7071300)
129 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
134 /// getSectionForConstant - Given a constant with the SectionKind, return a
135 /// section that it should be placed in.
136 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
138 /// getKindForGlobal - Classify the specified global variable into a set of
139 /// target independent categories embodied in SectionKind.
140 static SectionKind getKindForGlobal(const GlobalValue *GV,
141 const TargetMachine &TM);
143 /// SectionForGlobal - This method computes the appropriate section to emit
144 /// the specified global variable or function definition. This should not
145 /// be passed external (or available externally) globals.
146 const MCSection *SectionForGlobal(const GlobalValue *GV,
147 SectionKind Kind, Mangler *Mang,
148 const TargetMachine &TM) const;
150 /// SectionForGlobal - This method computes the appropriate section to emit
151 /// the specified global variable or function definition. This should not
152 /// be passed external (or available externally) globals.
153 const MCSection *SectionForGlobal(const GlobalValue *GV,
155 const TargetMachine &TM) const {
156 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
161 /// getExplicitSectionGlobal - Targets should implement this method to assign
162 /// a section to globals with an explicit section specfied. The
163 /// implementation of this method can assume that GV->hasSection() is true.
164 virtual const MCSection *
165 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
166 Mangler *Mang, const TargetMachine &TM) const = 0;
168 /// getSpecialCasedSectionGlobals - Allow the target to completely override
169 /// section assignment of a global.
170 virtual const MCSection *
171 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
172 SectionKind Kind) const {
177 virtual const MCSection *
178 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
179 Mangler *Mang, const TargetMachine &TM) const;
185 class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
187 mutable void *UniquingMap;
189 /// TLSDataSection - Section directive for Thread Local data.
191 const MCSection *TLSDataSection; // Defaults to ".tdata".
193 /// TLSBSSSection - Section directive for Thread Local uninitialized data.
194 /// Null if this target doesn't support a BSS section.
196 const MCSection *TLSBSSSection; // Defaults to ".tbss".
198 const MCSection *DataRelSection;
199 const MCSection *DataRelLocalSection;
200 const MCSection *DataRelROSection;
201 const MCSection *DataRelROLocalSection;
203 const MCSection *MergeableConst4Section;
204 const MCSection *MergeableConst8Section;
205 const MCSection *MergeableConst16Section;
208 const MCSection *getELFSection(StringRef Section, unsigned Type,
209 unsigned Flags, SectionKind Kind,
210 bool IsExplicit = false) const;
212 TargetLoweringObjectFileELF(// FIXME: REMOVE AFTER UNIQUING IS FIXED.
213 bool hasCrazyBSS = false)
214 : HasCrazyBSS(hasCrazyBSS), UniquingMap(0) {}
216 ~TargetLoweringObjectFileELF();
219 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
221 /// getSectionForConstant - Given a constant with the SectionKind, return a
222 /// section that it should be placed in.
223 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
226 virtual const MCSection *
227 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
228 Mangler *Mang, const TargetMachine &TM) const;
230 virtual const MCSection *
231 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
232 Mangler *Mang, const TargetMachine &TM) const;
237 class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
238 mutable void *UniquingMap;
240 const MCSection *CStringSection;
241 const MCSection *UStringSection;
242 const MCSection *TextCoalSection;
243 const MCSection *ConstTextCoalSection;
244 const MCSection *ConstDataCoalSection;
245 const MCSection *ConstDataSection;
246 const MCSection *DataCoalSection;
247 const MCSection *FourByteConstantSection;
248 const MCSection *EightByteConstantSection;
249 const MCSection *SixteenByteConstantSection;
251 const MCSection *LazySymbolPointerSection;
252 const MCSection *NonLazySymbolPointerSection;
254 TargetLoweringObjectFileMachO() : UniquingMap(0) {}
255 ~TargetLoweringObjectFileMachO();
257 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
259 virtual const MCSection *
260 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
261 Mangler *Mang, const TargetMachine &TM) const;
263 virtual const MCSection *
264 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
265 Mangler *Mang, const TargetMachine &TM) const;
267 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
269 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
270 /// decide not to emit the UsedDirective for some symbols in llvm.used.
271 /// FIXME: REMOVE this (rdar://7071300)
272 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
275 /// getMachOSection - Return the MCSection for the specified mach-o section.
276 /// This requires the operands to be valid.
277 const MCSectionMachO *getMachOSection(const StringRef &Segment,
278 const StringRef &Section,
279 unsigned TypeAndAttributes,
280 SectionKind K) const {
281 return getMachOSection(Segment, Section, TypeAndAttributes, 0, K);
283 const MCSectionMachO *getMachOSection(const StringRef &Segment,
284 const StringRef &Section,
285 unsigned TypeAndAttributes,
287 SectionKind K) const;
289 /// getTextCoalSection - Return the "__TEXT,__textcoal_nt" section we put weak
291 const MCSection *getTextCoalSection() const {
292 return TextCoalSection;
295 /// getLazySymbolPointerSection - Return the section corresponding to
296 /// the .lazy_symbol_pointer directive.
297 const MCSection *getLazySymbolPointerSection() const {
298 return LazySymbolPointerSection;
301 /// getNonLazySymbolPointerSection - Return the section corresponding to
302 /// the .non_lazy_symbol_pointer directive.
303 const MCSection *getNonLazySymbolPointerSection() const {
304 return NonLazySymbolPointerSection;
310 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
311 mutable void *UniquingMap;
313 TargetLoweringObjectFileCOFF() : UniquingMap(0) {}
314 ~TargetLoweringObjectFileCOFF();
316 virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
318 virtual const MCSection *
319 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
320 Mangler *Mang, const TargetMachine &TM) const;
322 virtual const MCSection *
323 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
324 Mangler *Mang, const TargetMachine &TM) const;
326 /// getCOFFSection - Return the MCSection for the specified COFF section.
327 /// FIXME: Switch this to a semantic view eventually.
328 const MCSection *getCOFFSection(const char *Name, bool isDirective,
329 SectionKind K) const;
332 } // end namespace llvm