LLVM  7.0.0svn
MCObjectFileInfo.h
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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_MCOBJECTFILEINFO_H
15 #define LLVM_MC_MCOBJECTFILEINFO_H
16 
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/Triple.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/Support/CodeGen.h"
21 
22 namespace llvm {
23 class MCContext;
24 class MCSection;
25 
27 protected:
28  /// True if .comm supports alignment. This is a hack for as long as we
29  /// support 10.4 Tiger, whose assembler doesn't support alignment on comm.
31 
32  /// True if target object file supports a weak_definition of constant 0 for an
33  /// omitted EH frame.
35 
36  /// True if the target object file supports emitting a compact unwind section
37  /// without an associated EH frame section.
39 
40  /// OmitDwarfIfHaveCompactUnwind - True if the target object file
41  /// supports having some functions with compact unwind and other with
42  /// dwarf unwind.
44 
45  /// PersonalityEncoding, LSDAEncoding, TTypeEncoding - Some encoding values
46  /// for EH.
48  unsigned LSDAEncoding;
49  unsigned FDECFIEncoding;
50  unsigned TTypeEncoding;
51 
52  /// Compact unwind encoding indicating that we should emit only an EH frame.
54 
55  /// Section directive for standard text.
57 
58  /// Section directive for standard data.
60 
61  /// Section that is default initialized to zero.
63 
64  /// Section that is readonly and can contain arbitrary initialized data.
65  /// Targets are not required to have a readonly section. If they don't,
66  /// various bits of code will fall back to using the data section for
67  /// constants.
69 
70  /// If exception handling is supported by the target, this is the section the
71  /// Language Specific Data Area information is emitted to.
73 
74  /// If exception handling is supported by the target and the target can
75  /// support a compact representation of the CIE and FDE, this is the section
76  /// to emit them into.
78 
79  // Dwarf sections for debug info. If a target supports debug info, these must
80  // be set.
93  // The pubnames section is no longer generated by default. The generation
94  // can be enabled by a compiler flag.
96 
97  /// Accelerator table sections. DwarfDebugNamesSection is the DWARF v5
98  /// accelerator table, while DwarfAccelNamesSection, DwarfAccelObjCSection,
99  /// DwarfAccelNamespaceSection, DwarfAccelTypesSection are pre-DWARF v5
100  /// extensions.
106 
107  // These are used for the Fission separate debug information files.
115 
116  /// The DWARF v5 string offset and address table sections.
119  /// The DWARF v5 range list section.
121 
122  /// The DWARF v5 range list section for fission.
124 
125  // These are for Fission DWP files.
128 
129  /// Section for newer gnu pubnames.
131  /// Section for newer gnu pubtypes.
133 
134  // Section for Swift AST
136 
140 
141  /// Extra TLS Variable Data section.
142  ///
143  /// If the target needs to put additional information for a TLS variable,
144  /// it'll go here.
146 
147  /// Section directive for Thread Local data. ELF, MachO, COFF, and Wasm.
148  MCSection *TLSDataSection; // Defaults to ".tdata".
149 
150  /// Section directive for Thread Local uninitialized data.
151  ///
152  /// Null if this target doesn't support a BSS section. ELF and MachO only.
153  MCSection *TLSBSSSection; // Defaults to ".tbss".
154 
155  /// StackMap section.
157 
158  /// FaultMap section.
160 
161  /// EH frame section.
162  ///
163  /// It is initialized on demand so it can be overwritten (with uniquing).
165 
166  /// Section containing metadata on function stack sizes.
169 
170  // ELF specific sections.
176 
177  // MachO specific sections.
178 
179  /// Section for thread local structure information.
180  ///
181  /// Contains the source code name of the variable, visibility and a pointer to
182  /// the initial value (.tdata or .tbss).
183  MCSection *TLSTLVSection; // Defaults to ".tlv".
184 
185  /// Section for thread local data initialization functions.
186  const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func".
187 
203 
204  /// COFF specific sections.
210 
211 public:
212  void InitMCObjectFileInfo(const Triple &TT, bool PIC, MCContext &ctx,
213  bool LargeCodeModel = false);
214 
217  }
220  }
223  }
224 
227  }
228 
229  unsigned getPersonalityEncoding() const { return PersonalityEncoding; }
230  unsigned getLSDAEncoding() const { return LSDAEncoding; }
231  unsigned getFDEEncoding() const { return FDECFIEncoding; }
232  unsigned getTTypeEncoding() const { return TTypeEncoding; }
233 
236  }
237 
238  MCSection *getTextSection() const { return TextSection; }
239  MCSection *getDataSection() const { return DataSection; }
240  MCSection *getBSSSection() const { return BSSSection; }
242  MCSection *getLSDASection() const { return LSDASection; }
253  }
256  }
259  }
266 
268  return DwarfDebugNamesSection;
269  }
271  return DwarfAccelNamesSection;
272  }
276  }
278  return DwarfAccelTypesSection;
279  }
281  MCSection *getDwarfTypesSection(uint64_t Hash) const;
292  }
296 
299  }
301  return COFFDebugTypesSection;
302  }
305  }
306 
308  const MCSection *getTLSDataSection() const { return TLSDataSection; }
310 
313 
314  MCSection *getStackSizesSection(const MCSection &TextSec) const;
315 
316  // ELF specific sections.
319  return MergeableConst4Section;
320  }
322  return MergeableConst8Section;
323  }
326  }
329  }
330 
331  // MachO specific sections.
332  const MCSection *getTLSTLVSection() const { return TLSTLVSection; }
334  return TLSThreadInitSection;
335  }
336  const MCSection *getCStringSection() const { return CStringSection; }
337  const MCSection *getUStringSection() const { return UStringSection; }
340  return ConstTextCoalSection;
341  }
342  const MCSection *getConstDataSection() const { return ConstDataSection; }
343  const MCSection *getDataCoalSection() const { return DataCoalSection; }
345  return ConstDataCoalSection;
346  }
351  }
354  }
357  }
360  }
363  }
366  }
367 
368  // COFF specific sections.
374 
376  return EHFrameSection;
377  }
378 
380  Environment getObjectFileType() const { return Env; }
381 
382  bool isPositionIndependent() const { return PositionIndependent; }
383 
384 private:
385  Environment Env;
386  bool PositionIndependent;
387  MCContext *Ctx;
388  Triple TT;
389 
390  void initMachOMCObjectFileInfo(const Triple &T);
391  void initELFMCObjectFileInfo(const Triple &T, bool Large);
392  void initCOFFMCObjectFileInfo(const Triple &T);
393  void initWasmMCObjectFileInfo(const Triple &T);
394 
395 public:
396  const Triple &getTargetTriple() const { return TT; }
397 };
398 
399 } // end namespace llvm
400 
401 #endif
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
MCSection * MergeableConst4Section
MCSection * DwarfStrOffSection
The DWARF v5 string offset and address table sections.
const MCSection * getConstDataSection() const
MCSection * getDwarfStrOffSection() const
MCSection * getDwarfTUIndexSection() const
MCSection * getDwarfAccelObjCSection() const
MCSection * getDwarfCUIndexSection() const
MCSection * getDwarfStrSection() const
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
MCSection * getCOFFDebugTypesSection() const
const MCSection * getTLSTLVSection() const
MCSection * getDwarfLineSection() const
MCSection * getStackMapSection() const
MCSection * DwarfPubTypesSection
MCSection * getDwarfLocSection() const
MCSection * DwarfGnuPubTypesSection
Section for newer gnu pubtypes.
MCSection * getTLSBSSSection() const
const MCSection * getFourByteConstantSection() const
MCSection * StackMapSection
StackMap section.
MCSection * SixteenByteConstantSection
MCSection * DwarfRnglistsSection
The DWARF v5 range list section.
unsigned PersonalityEncoding
PersonalityEncoding, LSDAEncoding, TTypeEncoding - Some encoding values for EH.
MCSection * TextSection
Section directive for standard text.
MCSection * getEHFrameSection()
MCSection * ConstTextCoalSection
MCSection * getDwarfAccelNamesSection() const
const MCSection * getConstDataCoalSection() const
MCSection * LazySymbolPointerSection
MCSection * getDwarfLineStrSection() const
MCSection * getDwarfARangesSection() const
bool getSupportsCompactUnwindWithoutEHFrame() const
MCSection * getCOFFGlobalTypeHashesSection() const
MCSection * getDwarfRnglistsDWOSection() const
MCSection * getDwarfRnglistsSection() const
MCSection * getDwarfPubNamesSection() const
MCSection * getReadOnlySection() const
MCSection * MergeableConst32Section
MCSection * DwarfDebugNamesSection
Accelerator table sections.
MCSection * getDwarfMacinfoSection() const
MCSection * getDwarfLocDWOSection() const
MCSection * COFFDebugTypesSection
const MCSection * getCStringSection() const
MCSection * MergeableConst16Section
MCSection * DwarfPubNamesSection
bool getCommDirectiveSupportsAlignment() const
MCSection * getBSSSection() const
MCSection * getDataSection() const
MCSection * EightByteConstantSection
unsigned getCompactUnwindDwarfEHFrameOnly() const
MCSection * getStackSizesSection(const MCSection &TextSec) const
MCSection * getDwarfFrameSection() const
MCSection * TLSDataSection
Section directive for Thread Local data. ELF, MachO, COFF, and Wasm.
MCSection * getDataBSSSection() const
bool getOmitDwarfIfHaveCompactUnwind() const
Context object for machine code objects.
Definition: MCContext.h:63
MCSection * getSXDataSection() const
const MCSection * DwarfDebugInlineSection
const MCSection * getDwarfDebugInlineSection() const
bool getSupportsWeakOmittedEHFrame() const
MCSection * getCOFFDebugSymbolsSection() const
MCSection * ConstDataCoalSection
MCSection * DrectveSection
COFF specific sections.
MCSection * getCompactUnwindSection() const
MCSection * getPDataSection() const
MCSection * DwarfAccelNamesSection
MCSection * getGFIDsSection() const
const MCSection * getMergeableConst16Section() const
MCSection * getDwarfAccelTypesSection() const
MCSection * getDwarfAbbrevSection() const
MCSection * DataSection
Section directive for standard data.
unsigned getLSDAEncoding() const
MCSection * getDwarfAbbrevDWOSection() const
MCSection * getTLSExtraDataSection() const
MCSection * getDwarfGnuPubTypesSection() const
MCSection * getDwarfTypesDWOSection() const
MCSection * ThreadLocalPointerSection
MCSection * DwarfLineStrSection
MCSection * getDwarfAddrSection() const
MCSection * DwarfSwiftASTSection
MCSection * TLSTLVSection
Section for thread local structure information.
MCSection * getNonLazySymbolPointerSection() const
unsigned getFDEEncoding() const
MCSection * DwarfAccelNamespaceSection
unsigned getPersonalityEncoding() const
MCSection * getDwarfLineDWOSection() const
const MCSection * getMergeableConst8Section() const
Environment getObjectFileType() const
MCSection * getDwarfTypesSection(uint64_t Hash) const
bool SupportsCompactUnwindWithoutEHFrame
True if the target object file supports emitting a compact unwind section without an associated EH fr...
MCSection * getDwarfSwiftASTSection() const
bool CommDirectiveSupportsAlignment
True if .comm supports alignment.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
MCSection * getDrectveSection() const
MCSection * COFFDebugSymbolsSection
MCSection * DwarfAbbrevSection
MCSection * getThreadLocalPointerSection() const
MCSection * EHFrameSection
EH frame section.
const MCSection * getEightByteConstantSection() const
MCSection * getDataRelROSection() const
MCSection * DwarfTypesDWOSection
MCSection * DwarfRangesSection
const MCSection * getConstTextCoalSection() const
const Triple & getTargetTriple() const
MCSection * DwarfARangesSection
const MCSection * getDataCommonSection() const
MCSection * CompactUnwindSection
If exception handling is supported by the target and the target can support a compact representation ...
MCSection * getDwarfInfoSection() const
MCSection * DwarfAccelTypesSection
MCSection * getDwarfDebugNamesSection() const
MCSection * getDwarfStrOffDWOSection() const
DenseMap< const MCSymbol *, unsigned > StackSizesUniquing
MCSection * DwarfStrOffDWOSection
MCSection * DwarfGnuPubNamesSection
Section for newer gnu pubnames.
MCSection * DwarfAbbrevDWOSection
const MCSection * getMergeableConst4Section() const
MCSection * getDwarfPubTypesSection() const
MCSection * FaultMapSection
FaultMap section.
bool OmitDwarfIfHaveCompactUnwind
OmitDwarfIfHaveCompactUnwind - True if the target object file supports having some functions with com...
MCSection * FourByteConstantSection
void InitMCObjectFileInfo(const Triple &TT, bool PIC, MCContext &ctx, bool LargeCodeModel=false)
MCSection * getDwarfStrDWOSection() const
const MCSection * getMergeableConst32Section() const
MCSection * getXDataSection() const
MCSection * LSDASection
If exception handling is supported by the target, this is the section the Language Specific Data Area...
MCSection * TLSExtraDataSection
Extra TLS Variable Data section.
MCSection * getLazySymbolPointerSection() const
unsigned CompactUnwindDwarfEHFrameOnly
Compact unwind encoding indicating that we should emit only an EH frame.
MCSection * StackSizesSection
Section containing metadata on function stack sizes.
MCSection * getDwarfGnuPubNamesSection() const
MCSection * DwarfAccelObjCSection
MCSection * getFaultMapSection() const
const MCSection * getTLSThreadInitSection() const
MCSection * getTextSection() const
MCSection * COFFGlobalTypeHashesSection
MCSection * TLSBSSSection
Section directive for Thread Local uninitialized data.
MCSection * NonLazySymbolPointerSection
MCSection * getDwarfAccelNamespaceSection() const
const MCSection * TLSThreadInitSection
Section for thread local data initialization functions.
MCSection * DwarfRnglistsDWOSection
The DWARF v5 range list section for fission.
bool SupportsWeakOmittedEHFrame
True if target object file supports a weak_definition of constant 0 for an omitted EH frame...
MCSection * getLSDASection() const
MCSection * getDwarfInfoDWOSection() const
MCSection * BSSSection
Section that is default initialized to zero.
MCSection * ReadOnlySection
Section that is readonly and can contain arbitrary initialized data.
bool isPositionIndependent() const
MCSection * DwarfMacinfoSection
MCSection * getDwarfRangesSection() const
const MCSection * getTLSDataSection() const
unsigned getTTypeEncoding() const
const MCSection * getSixteenByteConstantSection() const
const MCSection * getUStringSection() const
MCSection * getTextCoalSection() const
const MCSection * getDataCoalSection() const
MCSection * MergeableConst8Section