MCObjectFileInfo.h revision 637b25a6a04908562af422c0cafbcf9db94bcc81 
1//===-- llvm/MC/MCObjectFileInfo.h - Object File Info -----------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file describes common object file formats.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_MC_MCBJECTFILEINFO_H
15#define LLVM_MC_MCBJECTFILEINFO_H
16
17#include "llvm/MC/MCCodeGenInfo.h"
18#include "llvm/ADT/StringRef.h"
19#include "llvm/MC/SectionKind.h"
20
21namespace llvm {
22  class MCContext;
23  class MCSection;
24  class Triple;
25
26class MCObjectFileInfo {
27protected:
28  /// CommDirectiveSupportsAlignment - True if .comm supports alignment.  This
29  /// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't
30  /// support alignment on comm.
31  bool CommDirectiveSupportsAlignment;
32
33  /// SupportsWeakEmptyEHFrame - True if target object file supports a
34  /// weak_definition of constant 0 for an omitted EH frame.
35  bool SupportsWeakOmittedEHFrame;
36
37  /// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
38  /// "EH_frame" symbol for EH information should be an assembler temporary (aka
39  /// private linkage, aka an L or .L label) or false if it should be a normal
40  /// non-.globl label.  This defaults to true.
41  bool IsFunctionEHFrameSymbolPrivate;
42
43  /// PersonalityEncoding, LSDAEncoding, FDEEncoding, TTypeEncoding - Some
44  /// encoding values for EH.
45  unsigned PersonalityEncoding;
46  unsigned LSDAEncoding;
47  unsigned FDEEncoding;
48  unsigned FDECFIEncoding;
49  unsigned TTypeEncoding;
50
51  /// TextSection - Section directive for standard text.
52  ///
53  const MCSection *TextSection;
54
55  /// DataSection - Section directive for standard data.
56  ///
57  const MCSection *DataSection;
58
59  /// BSSSection - Section that is default initialized to zero.
60  const MCSection *BSSSection;
61
62  /// ReadOnlySection - Section that is readonly and can contain arbitrary
63  /// initialized data.  Targets are not required to have a readonly section.
64  /// If they don't, various bits of code will fall back to using the data
65  /// section for constants.
66  const MCSection *ReadOnlySection;
67
68  /// StaticCtorSection - This section contains the static constructor pointer
69  /// list.
70  const MCSection *StaticCtorSection;
71
72  /// StaticDtorSection - This section contains the static destructor pointer
73  /// list.
74  const MCSection *StaticDtorSection;
75
76  /// LSDASection - If exception handling is supported by the target, this is
77  /// the section the Language Specific Data Area information is emitted to.
78  const MCSection *LSDASection;
79
80  /// CompactUnwindSection - If exception handling is supported by the target
81  /// and the target can support a compact representation of the CIE and FDE,
82  /// this is the section to emit them into.
83  const MCSection *CompactUnwindSection;
84
85  /// DwarfAccelNamesSection, DwarfAccelObjCSection
86  /// If we use the DWARF accelerated hash tables then we want toe emit these
87  /// sections.
88  const MCSection *DwarfAccelNamesSection;
89  const MCSection *DwarfAccelObjCSection;
90  const MCSection *DwarfAccelNamespaceSection;
91  const MCSection *DwarfAccelTypesSection;
92
93  // Dwarf sections for debug info.  If a target supports debug info, these must
94  // be set.
95  const MCSection *DwarfAbbrevSection;
96  const MCSection *DwarfInfoSection;
97  const MCSection *DwarfLineSection;
98  const MCSection *DwarfFrameSection;
99  const MCSection *DwarfPubTypesSection;
100  const MCSection *DwarfDebugInlineSection;
101  const MCSection *DwarfStrSection;
102  const MCSection *DwarfLocSection;
103  const MCSection *DwarfARangesSection;
104  const MCSection *DwarfRangesSection;
105  const MCSection *DwarfMacroInfoSection;
106
107  // Extra TLS Variable Data section.  If the target needs to put additional
108  // information for a TLS variable, it'll go here.
109  const MCSection *TLSExtraDataSection;
110
111  /// TLSDataSection - Section directive for Thread Local data.
112  /// ELF, MachO and COFF.
113  const MCSection *TLSDataSection;        // Defaults to ".tdata".
114
115  /// TLSBSSSection - Section directive for Thread Local uninitialized data.
116  /// Null if this target doesn't support a BSS section.
117  /// ELF and MachO only.
118  const MCSection *TLSBSSSection;         // Defaults to ".tbss".
119
120
121  /// EHFrameSection - EH frame section. It is initialized on demand so it
122  /// can be overwritten (with uniquing).
123  const MCSection *EHFrameSection;
124
125  /// ELF specific sections.
126  ///
127  const MCSection *DataRelSection;
128  const MCSection *DataRelLocalSection;
129  const MCSection *DataRelROSection;
130  const MCSection *DataRelROLocalSection;
131  const MCSection *MergeableConst4Section;
132  const MCSection *MergeableConst8Section;
133  const MCSection *MergeableConst16Section;
134
135  /// MachO specific sections.
136  ///
137
138  /// TLSTLVSection - Section for thread local structure information.
139  /// Contains the source code name of the variable, visibility and a pointer
140  /// to the initial value (.tdata or .tbss).
141  const MCSection *TLSTLVSection;         // Defaults to ".tlv".
142
143  /// TLSThreadInitSection - Section for thread local data initialization
144  /// functions.
145  const MCSection *TLSThreadInitSection;  // Defaults to ".thread_init_func".
146
147  const MCSection *CStringSection;
148  const MCSection *UStringSection;
149  const MCSection *TextCoalSection;
150  const MCSection *ConstTextCoalSection;
151  const MCSection *ConstDataSection;
152  const MCSection *DataCoalSection;
153  const MCSection *DataCommonSection;
154  const MCSection *DataBSSSection;
155  const MCSection *FourByteConstantSection;
156  const MCSection *EightByteConstantSection;
157  const MCSection *SixteenByteConstantSection;
158  const MCSection *LazySymbolPointerSection;
159  const MCSection *NonLazySymbolPointerSection;
160
161  /// COFF specific sections.
162  ///
163  const MCSection *DrectveSection;
164  const MCSection *PDataSection;
165  const MCSection *XDataSection;
166
167public:
168  void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM,
169                            MCContext &ctx);
170
171  bool isFunctionEHFrameSymbolPrivate() const {
172    return IsFunctionEHFrameSymbolPrivate;
173  }
174  bool getSupportsWeakOmittedEHFrame() const {
175    return SupportsWeakOmittedEHFrame;
176  }
177  bool getCommDirectiveSupportsAlignment() const {
178    return CommDirectiveSupportsAlignment;
179  }
180
181  unsigned getPersonalityEncoding() const { return PersonalityEncoding; }
182  unsigned getLSDAEncoding() const { return LSDAEncoding; }
183  unsigned getFDEEncoding(bool CFI) const {
184    return CFI ? FDECFIEncoding : FDEEncoding;
185  }
186  unsigned getTTypeEncoding() const { return TTypeEncoding; }
187
188  const MCSection *getTextSection() const { return TextSection; }
189  const MCSection *getDataSection() const { return DataSection; }
190  const MCSection *getBSSSection() const { return BSSSection; }
191  const MCSection *getLSDASection() const { return LSDASection; }
192  const MCSection *getCompactUnwindSection() const{
193    return CompactUnwindSection;
194  }
195  const MCSection *getDwarfAccelNamesSection() const {
196    return DwarfAccelNamesSection;
197  }
198  const MCSection *getDwarfAccelObjCSection() const {
199    return DwarfAccelObjCSection;
200  }
201  const MCSection *getDwarfAccelNamespaceSection() const {
202    return DwarfAccelNamespaceSection;
203  }
204  const MCSection *getDwarfAccelTypesSection() const {
205    return DwarfAccelTypesSection;
206  }
207  const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
208  const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
209  const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
210  const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
211  const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
212  const MCSection *getDwarfDebugInlineSection() const {
213    return DwarfDebugInlineSection;
214  }
215  const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
216  const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
217  const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
218  const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
219  const MCSection *getDwarfMacroInfoSection() const {
220    return DwarfMacroInfoSection;
221  }
222  const MCSection *getTLSExtraDataSection() const {
223    return TLSExtraDataSection;
224  }
225  const MCSection *getTLSDataSection() const { return TLSDataSection; }
226  const MCSection *getTLSBSSSection() const { return TLSBSSSection; }
227
228  /// ELF specific sections.
229  ///
230  const MCSection *getDataRelSection() const { return DataRelSection; }
231  const MCSection *getDataRelLocalSection() const {
232    return DataRelLocalSection;
233  }
234  const MCSection *getDataRelROSection() const { return DataRelROSection; }
235  const MCSection *getDataRelROLocalSection() const {
236    return DataRelROLocalSection;
237  }
238  const MCSection *getMergeableConst4Section() const {
239    return MergeableConst4Section;
240  }
241  const MCSection *getMergeableConst8Section() const {
242    return MergeableConst8Section;
243  }
244  const MCSection *getMergeableConst16Section() const {
245    return MergeableConst16Section;
246  }
247
248  /// MachO specific sections.
249  ///
250  const MCSection *getTLSTLVSection() const { return TLSTLVSection; }
251  const MCSection *getTLSThreadInitSection() const {
252    return TLSThreadInitSection;
253  }
254  const MCSection *getCStringSection() const { return CStringSection; }
255  const MCSection *getUStringSection() const { return UStringSection; }
256  const MCSection *getTextCoalSection() const { return TextCoalSection; }
257  const MCSection *getConstTextCoalSection() const {
258    return ConstTextCoalSection;
259  }
260  const MCSection *getConstDataSection() const { return ConstDataSection; }
261  const MCSection *getDataCoalSection() const { return DataCoalSection; }
262  const MCSection *getDataCommonSection() const { return DataCommonSection; }
263  const MCSection *getDataBSSSection() const { return DataBSSSection; }
264  const MCSection *getFourByteConstantSection() const {
265    return FourByteConstantSection;
266  }
267  const MCSection *getEightByteConstantSection() const {
268    return EightByteConstantSection;
269  }
270  const MCSection *getSixteenByteConstantSection() const {
271    return SixteenByteConstantSection;
272  }
273  const MCSection *getLazySymbolPointerSection() const {
274    return LazySymbolPointerSection;
275  }
276  const MCSection *getNonLazySymbolPointerSection() const {
277    return NonLazySymbolPointerSection;
278  }
279
280  /// COFF specific sections.
281  ///
282  const MCSection *getDrectveSection() const { return DrectveSection; }
283  const MCSection *getPDataSection() const { return PDataSection; }
284  const MCSection *getXDataSection() const { return XDataSection; }
285
286  const MCSection *getEHFrameSection() {
287    return EHFrameSection;
288  }
289
290private:
291  enum Environment { IsMachO, IsELF, IsCOFF };
292  Environment Env;
293  Reloc::Model RelocM;
294  CodeModel::Model CMModel;
295  MCContext *Ctx;
296
297  void InitMachOMCObjectFileInfo(Triple T);
298  void InitELFMCObjectFileInfo(Triple T);
299  void InitCOFFMCObjectFileInfo(Triple T);
300
301};
302
303} // end namespace llvm
304
305#endif
306