1 //===-- llvm/MC/MCObjectFileInfo.h - Object File 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 describes common object file formats.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCOBJECTFILEINFO_H
15 #define LLVM_MC_MCOBJECTFILEINFO_H
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Support/CodeGen.h"
25 class MCObjectFileInfo {
27 /// CommDirectiveSupportsAlignment - True if .comm supports alignment. This
28 /// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't
29 /// support alignment on comm.
30 bool CommDirectiveSupportsAlignment;
32 /// SupportsWeakEmptyEHFrame - True if target object file supports a
33 /// weak_definition of constant 0 for an omitted EH frame.
34 bool SupportsWeakOmittedEHFrame;
36 /// SupportsCompactUnwindWithoutEHFrame - True if the target object file
37 /// supports emitting a compact unwind section without an associated EH frame
39 bool SupportsCompactUnwindWithoutEHFrame;
41 /// PersonalityEncoding, LSDAEncoding, TTypeEncoding - Some encoding values
43 unsigned PersonalityEncoding;
44 unsigned LSDAEncoding;
45 unsigned FDECFIEncoding;
46 unsigned TTypeEncoding;
48 /// Section flags for eh_frame
49 unsigned EHSectionType;
50 unsigned EHSectionFlags;
52 /// CompactUnwindDwarfEHFrameOnly - Compact unwind encoding indicating that we
53 /// should emit only an EH frame.
54 unsigned CompactUnwindDwarfEHFrameOnly;
56 /// TextSection - Section directive for standard text.
58 const MCSection *TextSection;
60 /// DataSection - Section directive for standard data.
62 const MCSection *DataSection;
64 /// BSSSection - Section that is default initialized to zero.
65 const MCSection *BSSSection;
67 /// ReadOnlySection - Section that is readonly and can contain arbitrary
68 /// initialized data. Targets are not required to have a readonly section.
69 /// If they don't, various bits of code will fall back to using the data
70 /// section for constants.
71 const MCSection *ReadOnlySection;
73 /// StaticCtorSection - This section contains the static constructor pointer
75 const MCSection *StaticCtorSection;
77 /// StaticDtorSection - This section contains the static destructor pointer
79 const MCSection *StaticDtorSection;
81 /// LSDASection - If exception handling is supported by the target, this is
82 /// the section the Language Specific Data Area information is emitted to.
83 const MCSection *LSDASection;
85 /// CompactUnwindSection - If exception handling is supported by the target
86 /// and the target can support a compact representation of the CIE and FDE,
87 /// this is the section to emit them into.
88 const MCSection *CompactUnwindSection;
90 // Dwarf sections for debug info. If a target supports debug info, these must
92 const MCSection *DwarfAbbrevSection;
93 const MCSection *DwarfInfoSection;
94 const MCSection *DwarfLineSection;
95 const MCSection *DwarfFrameSection;
96 const MCSection *DwarfPubTypesSection;
97 const MCSection *DwarfDebugInlineSection;
98 const MCSection *DwarfStrSection;
99 const MCSection *DwarfLocSection;
100 const MCSection *DwarfARangesSection;
101 const MCSection *DwarfRangesSection;
102 const MCSection *DwarfMacroInfoSection;
103 // The pubnames section is no longer generated by default. The generation
104 // can be enabled by a compiler flag.
105 const MCSection *DwarfPubNamesSection;
107 // DWARF5 Experimental Debug Info Sections
108 /// DwarfAccelNamesSection, DwarfAccelObjCSection,
109 /// DwarfAccelNamespaceSection, DwarfAccelTypesSection -
110 /// If we use the DWARF accelerated hash tables then we want to emit these
112 const MCSection *DwarfAccelNamesSection;
113 const MCSection *DwarfAccelObjCSection;
114 const MCSection *DwarfAccelNamespaceSection;
115 const MCSection *DwarfAccelTypesSection;
117 /// These are used for the Fission separate debug information files.
118 const MCSection *DwarfInfoDWOSection;
119 const MCSection *DwarfTypesDWOSection;
120 const MCSection *DwarfAbbrevDWOSection;
121 const MCSection *DwarfStrDWOSection;
122 const MCSection *DwarfLineDWOSection;
123 const MCSection *DwarfLocDWOSection;
124 const MCSection *DwarfStrOffDWOSection;
125 const MCSection *DwarfAddrSection;
127 /// Sections for newer gnu pubnames and pubtypes.
128 const MCSection *DwarfGnuPubNamesSection;
129 const MCSection *DwarfGnuPubTypesSection;
131 const MCSection *COFFDebugSymbolsSection;
133 // Extra TLS Variable Data section. If the target needs to put additional
134 // information for a TLS variable, it'll go here.
135 const MCSection *TLSExtraDataSection;
137 /// TLSDataSection - Section directive for Thread Local data.
138 /// ELF, MachO and COFF.
139 const MCSection *TLSDataSection; // Defaults to ".tdata".
141 /// TLSBSSSection - Section directive for Thread Local uninitialized data.
142 /// Null if this target doesn't support a BSS section.
143 /// ELF and MachO only.
144 const MCSection *TLSBSSSection; // Defaults to ".tbss".
146 /// StackMap section.
147 const MCSection *StackMapSection;
149 /// EHFrameSection - EH frame section. It is initialized on demand so it
150 /// can be overwritten (with uniquing).
151 const MCSection *EHFrameSection;
153 /// ELF specific sections.
155 const MCSection *DataRelSection;
156 const MCSection *DataRelLocalSection;
157 const MCSection *DataRelROSection;
158 const MCSection *DataRelROLocalSection;
159 const MCSection *MergeableConst4Section;
160 const MCSection *MergeableConst8Section;
161 const MCSection *MergeableConst16Section;
163 /// MachO specific sections.
166 /// TLSTLVSection - Section for thread local structure information.
167 /// Contains the source code name of the variable, visibility and a pointer
168 /// to the initial value (.tdata or .tbss).
169 const MCSection *TLSTLVSection; // Defaults to ".tlv".
171 /// TLSThreadInitSection - Section for thread local data initialization
173 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func".
175 const MCSection *CStringSection;
176 const MCSection *UStringSection;
177 const MCSection *TextCoalSection;
178 const MCSection *ConstTextCoalSection;
179 const MCSection *ConstDataSection;
180 const MCSection *DataCoalSection;
181 const MCSection *DataCommonSection;
182 const MCSection *DataBSSSection;
183 const MCSection *FourByteConstantSection;
184 const MCSection *EightByteConstantSection;
185 const MCSection *SixteenByteConstantSection;
186 const MCSection *LazySymbolPointerSection;
187 const MCSection *NonLazySymbolPointerSection;
189 /// COFF specific sections.
191 const MCSection *DrectveSection;
192 const MCSection *PDataSection;
193 const MCSection *XDataSection;
196 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM,
199 bool getSupportsWeakOmittedEHFrame() const {
200 return SupportsWeakOmittedEHFrame;
202 bool getSupportsCompactUnwindWithoutEHFrame() const {
203 return SupportsCompactUnwindWithoutEHFrame;
205 bool getCommDirectiveSupportsAlignment() const {
206 return CommDirectiveSupportsAlignment;
209 unsigned getPersonalityEncoding() const { return PersonalityEncoding; }
210 unsigned getLSDAEncoding() const { return LSDAEncoding; }
211 unsigned getFDEEncoding() const { return FDECFIEncoding; }
212 unsigned getTTypeEncoding() const { return TTypeEncoding; }
214 unsigned getCompactUnwindDwarfEHFrameOnly() const {
215 return CompactUnwindDwarfEHFrameOnly;
218 const MCSection *getTextSection() const { return TextSection; }
219 const MCSection *getDataSection() const { return DataSection; }
220 const MCSection *getBSSSection() const { return BSSSection; }
221 const MCSection *getLSDASection() const { return LSDASection; }
222 const MCSection *getCompactUnwindSection() const{
223 return CompactUnwindSection;
225 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
226 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
227 const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
228 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
229 const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
230 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
231 const MCSection *getDwarfGnuPubNamesSection() const {
232 return DwarfGnuPubNamesSection;
234 const MCSection *getDwarfGnuPubTypesSection() const {
235 return DwarfGnuPubTypesSection;
237 const MCSection *getDwarfDebugInlineSection() const {
238 return DwarfDebugInlineSection;
240 const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
241 const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
242 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
243 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
244 const MCSection *getDwarfMacroInfoSection() const {
245 return DwarfMacroInfoSection;
248 // DWARF5 Experimental Debug Info Sections
249 const MCSection *getDwarfAccelNamesSection() const {
250 return DwarfAccelNamesSection;
252 const MCSection *getDwarfAccelObjCSection() const {
253 return DwarfAccelObjCSection;
255 const MCSection *getDwarfAccelNamespaceSection() const {
256 return DwarfAccelNamespaceSection;
258 const MCSection *getDwarfAccelTypesSection() const {
259 return DwarfAccelTypesSection;
261 const MCSection *getDwarfInfoDWOSection() const {
262 return DwarfInfoDWOSection;
264 const MCSection *getDwarfTypesSection(uint64_t Hash) const;
265 const MCSection *getDwarfTypesDWOSection() const {
266 return DwarfTypesDWOSection;
268 const MCSection *getDwarfAbbrevDWOSection() const {
269 return DwarfAbbrevDWOSection;
271 const MCSection *getDwarfStrDWOSection() const {
272 return DwarfStrDWOSection;
274 const MCSection *getDwarfLineDWOSection() const {
275 return DwarfLineDWOSection;
277 const MCSection *getDwarfLocDWOSection() const {
278 return DwarfLocDWOSection;
280 const MCSection *getDwarfStrOffDWOSection() const {
281 return DwarfStrOffDWOSection;
283 const MCSection *getDwarfAddrSection() const {
284 return DwarfAddrSection;
287 const MCSection *getCOFFDebugSymbolsSection() const {
288 return COFFDebugSymbolsSection;
291 const MCSection *getTLSExtraDataSection() const {
292 return TLSExtraDataSection;
294 const MCSection *getTLSDataSection() const { return TLSDataSection; }
295 const MCSection *getTLSBSSSection() const { return TLSBSSSection; }
297 const MCSection *getStackMapSection() const { return StackMapSection; }
299 /// ELF specific sections.
301 const MCSection *getDataRelSection() const { return DataRelSection; }
302 const MCSection *getDataRelLocalSection() const {
303 return DataRelLocalSection;
305 const MCSection *getDataRelROSection() const { return DataRelROSection; }
306 const MCSection *getDataRelROLocalSection() const {
307 return DataRelROLocalSection;
309 const MCSection *getMergeableConst4Section() const {
310 return MergeableConst4Section;
312 const MCSection *getMergeableConst8Section() const {
313 return MergeableConst8Section;
315 const MCSection *getMergeableConst16Section() const {
316 return MergeableConst16Section;
319 /// MachO specific sections.
321 const MCSection *getTLSTLVSection() const { return TLSTLVSection; }
322 const MCSection *getTLSThreadInitSection() const {
323 return TLSThreadInitSection;
325 const MCSection *getCStringSection() const { return CStringSection; }
326 const MCSection *getUStringSection() const { return UStringSection; }
327 const MCSection *getTextCoalSection() const { return TextCoalSection; }
328 const MCSection *getConstTextCoalSection() const {
329 return ConstTextCoalSection;
331 const MCSection *getConstDataSection() const { return ConstDataSection; }
332 const MCSection *getDataCoalSection() const { return DataCoalSection; }
333 const MCSection *getDataCommonSection() const { return DataCommonSection; }
334 const MCSection *getDataBSSSection() const { return DataBSSSection; }
335 const MCSection *getFourByteConstantSection() const {
336 return FourByteConstantSection;
338 const MCSection *getEightByteConstantSection() const {
339 return EightByteConstantSection;
341 const MCSection *getSixteenByteConstantSection() const {
342 return SixteenByteConstantSection;
344 const MCSection *getLazySymbolPointerSection() const {
345 return LazySymbolPointerSection;
347 const MCSection *getNonLazySymbolPointerSection() const {
348 return NonLazySymbolPointerSection;
351 /// COFF specific sections.
353 const MCSection *getDrectveSection() const { return DrectveSection; }
354 const MCSection *getPDataSection() const { return PDataSection; }
355 const MCSection *getXDataSection() const { return XDataSection; }
357 const MCSection *getEHFrameSection() {
359 InitEHFrameSection();
360 return EHFrameSection;
363 enum Environment { IsMachO, IsELF, IsCOFF };
364 Environment getObjectFileType() const {
368 Reloc::Model getRelocM() const {
375 CodeModel::Model CMModel;
379 void InitMachOMCObjectFileInfo(Triple T);
380 void InitELFMCObjectFileInfo(Triple T);
381 void InitCOFFMCObjectFileInfo(Triple T);
383 /// InitEHFrameSection - Initialize EHFrameSection on demand.
385 void InitEHFrameSection();
388 const Triple &getTargetTriple() const { return TT; }
391 } // end namespace llvm