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_MCBJECTFILEINFO_H
15 #define LLVM_MC_MCBJECTFILEINFO_H
17 #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 /// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
37 /// "EH_frame" symbol for EH information should be an assembler temporary (aka
38 /// private linkage, aka an L or .L label) or false if it should be a normal
39 /// non-.globl label. This defaults to true.
40 bool IsFunctionEHFrameSymbolPrivate;
42 /// PersonalityEncoding, LSDAEncoding, FDEEncoding, TTypeEncoding - Some
43 /// encoding values for EH.
44 unsigned PersonalityEncoding;
45 unsigned LSDAEncoding;
47 unsigned FDECFIEncoding;
48 unsigned TTypeEncoding;
49 // Section flags for eh_frame
50 unsigned EHSectionType;
51 unsigned EHSectionFlags;
53 /// TextSection - Section directive for standard text.
55 const MCSection *TextSection;
57 /// DataSection - Section directive for standard data.
59 const MCSection *DataSection;
61 /// BSSSection - Section that is default initialized to zero.
62 const MCSection *BSSSection;
64 /// ReadOnlySection - Section that is readonly and can contain arbitrary
65 /// initialized data. Targets are not required to have a readonly section.
66 /// If they don't, various bits of code will fall back to using the data
67 /// section for constants.
68 const MCSection *ReadOnlySection;
70 /// StaticCtorSection - This section contains the static constructor pointer
72 const MCSection *StaticCtorSection;
74 /// StaticDtorSection - This section contains the static destructor pointer
76 const MCSection *StaticDtorSection;
78 /// LSDASection - If exception handling is supported by the target, this is
79 /// the section the Language Specific Data Area information is emitted to.
80 const MCSection *LSDASection;
82 /// CompactUnwindSection - If exception handling is supported by the target
83 /// and the target can support a compact representation of the CIE and FDE,
84 /// this is the section to emit them into.
85 const MCSection *CompactUnwindSection;
87 /// DwarfAccelNamesSection, DwarfAccelObjCSection
88 /// If we use the DWARF accelerated hash tables then we want toe emit these
90 const MCSection *DwarfAccelNamesSection;
91 const MCSection *DwarfAccelObjCSection;
92 const MCSection *DwarfAccelNamespaceSection;
93 const MCSection *DwarfAccelTypesSection;
95 // Dwarf sections for debug info. If a target supports debug info, these must
97 const MCSection *DwarfAbbrevSection;
98 const MCSection *DwarfInfoSection;
99 const MCSection *DwarfLineSection;
100 const MCSection *DwarfFrameSection;
101 const MCSection *DwarfPubTypesSection;
102 const MCSection *DwarfDebugInlineSection;
103 const MCSection *DwarfStrSection;
104 const MCSection *DwarfLocSection;
105 const MCSection *DwarfARangesSection;
106 const MCSection *DwarfRangesSection;
107 const MCSection *DwarfMacroInfoSection;
109 // Extra TLS Variable Data section. If the target needs to put additional
110 // information for a TLS variable, it'll go here.
111 const MCSection *TLSExtraDataSection;
113 /// TLSDataSection - Section directive for Thread Local data.
114 /// ELF, MachO and COFF.
115 const MCSection *TLSDataSection; // Defaults to ".tdata".
117 /// TLSBSSSection - Section directive for Thread Local uninitialized data.
118 /// Null if this target doesn't support a BSS section.
119 /// ELF and MachO only.
120 const MCSection *TLSBSSSection; // Defaults to ".tbss".
123 /// EHFrameSection - EH frame section. It is initialized on demand so it
124 /// can be overwritten (with uniquing).
125 const MCSection *EHFrameSection;
127 /// ELF specific sections.
129 const MCSection *DataRelSection;
130 const MCSection *DataRelLocalSection;
131 const MCSection *DataRelROSection;
132 const MCSection *DataRelROLocalSection;
133 const MCSection *MergeableConst4Section;
134 const MCSection *MergeableConst8Section;
135 const MCSection *MergeableConst16Section;
137 /// MachO specific sections.
140 /// TLSTLVSection - Section for thread local structure information.
141 /// Contains the source code name of the variable, visibility and a pointer
142 /// to the initial value (.tdata or .tbss).
143 const MCSection *TLSTLVSection; // Defaults to ".tlv".
145 /// TLSThreadInitSection - Section for thread local data initialization
147 const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func".
149 const MCSection *CStringSection;
150 const MCSection *UStringSection;
151 const MCSection *TextCoalSection;
152 const MCSection *ConstTextCoalSection;
153 const MCSection *ConstDataSection;
154 const MCSection *DataCoalSection;
155 const MCSection *DataCommonSection;
156 const MCSection *DataBSSSection;
157 const MCSection *FourByteConstantSection;
158 const MCSection *EightByteConstantSection;
159 const MCSection *SixteenByteConstantSection;
160 const MCSection *LazySymbolPointerSection;
161 const MCSection *NonLazySymbolPointerSection;
163 /// COFF specific sections.
165 const MCSection *DrectveSection;
166 const MCSection *PDataSection;
167 const MCSection *XDataSection;
170 void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM,
173 bool isFunctionEHFrameSymbolPrivate() const {
174 return IsFunctionEHFrameSymbolPrivate;
176 bool getSupportsWeakOmittedEHFrame() const {
177 return SupportsWeakOmittedEHFrame;
179 bool getCommDirectiveSupportsAlignment() const {
180 return CommDirectiveSupportsAlignment;
183 unsigned getPersonalityEncoding() const { return PersonalityEncoding; }
184 unsigned getLSDAEncoding() const { return LSDAEncoding; }
185 unsigned getFDEEncoding(bool CFI) const {
186 return CFI ? FDECFIEncoding : FDEEncoding;
188 unsigned getTTypeEncoding() const { return TTypeEncoding; }
190 const MCSection *getTextSection() const { return TextSection; }
191 const MCSection *getDataSection() const { return DataSection; }
192 const MCSection *getBSSSection() const { return BSSSection; }
193 const MCSection *getLSDASection() const { return LSDASection; }
194 const MCSection *getCompactUnwindSection() const{
195 return CompactUnwindSection;
197 const MCSection *getDwarfAccelNamesSection() const {
198 return DwarfAccelNamesSection;
200 const MCSection *getDwarfAccelObjCSection() const {
201 return DwarfAccelObjCSection;
203 const MCSection *getDwarfAccelNamespaceSection() const {
204 return DwarfAccelNamespaceSection;
206 const MCSection *getDwarfAccelTypesSection() const {
207 return DwarfAccelTypesSection;
209 const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
210 const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
211 const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
212 const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
213 const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
214 const MCSection *getDwarfDebugInlineSection() const {
215 return DwarfDebugInlineSection;
217 const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
218 const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
219 const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
220 const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
221 const MCSection *getDwarfMacroInfoSection() const {
222 return DwarfMacroInfoSection;
224 const MCSection *getTLSExtraDataSection() const {
225 return TLSExtraDataSection;
227 const MCSection *getTLSDataSection() const { return TLSDataSection; }
228 const MCSection *getTLSBSSSection() const { return TLSBSSSection; }
230 /// ELF specific sections.
232 const MCSection *getDataRelSection() const { return DataRelSection; }
233 const MCSection *getDataRelLocalSection() const {
234 return DataRelLocalSection;
236 const MCSection *getDataRelROSection() const { return DataRelROSection; }
237 const MCSection *getDataRelROLocalSection() const {
238 return DataRelROLocalSection;
240 const MCSection *getMergeableConst4Section() const {
241 return MergeableConst4Section;
243 const MCSection *getMergeableConst8Section() const {
244 return MergeableConst8Section;
246 const MCSection *getMergeableConst16Section() const {
247 return MergeableConst16Section;
250 /// MachO specific sections.
252 const MCSection *getTLSTLVSection() const { return TLSTLVSection; }
253 const MCSection *getTLSThreadInitSection() const {
254 return TLSThreadInitSection;
256 const MCSection *getCStringSection() const { return CStringSection; }
257 const MCSection *getUStringSection() const { return UStringSection; }
258 const MCSection *getTextCoalSection() const { return TextCoalSection; }
259 const MCSection *getConstTextCoalSection() const {
260 return ConstTextCoalSection;
262 const MCSection *getConstDataSection() const { return ConstDataSection; }
263 const MCSection *getDataCoalSection() const { return DataCoalSection; }
264 const MCSection *getDataCommonSection() const { return DataCommonSection; }
265 const MCSection *getDataBSSSection() const { return DataBSSSection; }
266 const MCSection *getFourByteConstantSection() const {
267 return FourByteConstantSection;
269 const MCSection *getEightByteConstantSection() const {
270 return EightByteConstantSection;
272 const MCSection *getSixteenByteConstantSection() const {
273 return SixteenByteConstantSection;
275 const MCSection *getLazySymbolPointerSection() const {
276 return LazySymbolPointerSection;
278 const MCSection *getNonLazySymbolPointerSection() const {
279 return NonLazySymbolPointerSection;
282 /// COFF specific sections.
284 const MCSection *getDrectveSection() const { return DrectveSection; }
285 const MCSection *getPDataSection() const { return PDataSection; }
286 const MCSection *getXDataSection() const { return XDataSection; }
288 const MCSection *getEHFrameSection() {
290 InitEHFrameSection();
291 return EHFrameSection;
295 enum Environment { IsMachO, IsELF, IsCOFF };
298 CodeModel::Model CMModel;
301 void InitMachOMCObjectFileInfo(Triple T);
302 void InitELFMCObjectFileInfo(Triple T);
303 void InitCOFFMCObjectFileInfo(Triple T);
305 /// InitEHFrameSection - Initialize EHFrameSection on demand.
307 void InitEHFrameSection();
310 } // end namespace llvm