LLVM  13.0.0git
MCSymbol.h
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1 //===- MCSymbol.h - Machine Code Symbols ------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains the declaration of the MCSymbol class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_MC_MCSYMBOL_H
14 #define LLVM_MC_MCSYMBOL_H
15 
17 #include "llvm/ADT/StringMap.h"
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCFragment.h"
23 #include <cassert>
24 #include <cstddef>
25 #include <cstdint>
26 
27 namespace llvm {
28 
29 class MCAsmInfo;
30 class MCContext;
31 class MCSection;
32 class raw_ostream;
33 
34 /// MCSymbol - Instances of this class represent a symbol name in the MC file,
35 /// and MCSymbols are created and uniqued by the MCContext class. MCSymbols
36 /// should only be constructed with valid names for the object file.
37 ///
38 /// If the symbol is defined/emitted into the current translation unit, the
39 /// Section member is set to indicate what section it lives in. Otherwise, if
40 /// it is a reference to an external entity, it has a null section.
41 class MCSymbol {
42 protected:
43  /// The kind of the symbol. If it is any value other than unset then this
44  /// class is actually one of the appropriate subclasses of MCSymbol.
45  enum SymbolKind {
52  };
53 
54  /// A symbol can contain an Offset, or Value, or be Common, but never more
55  /// than one of these.
56  enum Contents : uint8_t {
61  SymContentsTargetCommon, // Index stores the section index
62  };
63 
64  // Special sentinal value for the absolute pseudo fragment.
66 
67  /// If a symbol has a Fragment, the section is implied, so we only need
68  /// one pointer.
69  /// The special AbsolutePseudoFragment value is for absolute symbols.
70  /// If this is a variable symbol, this caches the variable value's fragment.
71  /// FIXME: We might be able to simplify this by having the asm streamer create
72  /// dummy fragments.
73  /// If this is a section, then it gives the symbol is defined in. This is null
74  /// for undefined symbols.
75  ///
76  /// If this is a fragment, then it gives the fragment this symbol's value is
77  /// relative to, if any.
78  ///
79  /// For the 'HasName' integer, this is true if this symbol is named.
80  /// A named symbol will have a pointer to the name allocated in the bytes
81  /// immediately prior to the MCSymbol.
83 
84  /// IsTemporary - True if this is an assembler temporary label, which
85  /// typically does not survive in the .o file's symbol table. Usually
86  /// "Lfoo" or ".foo".
87  unsigned IsTemporary : 1;
88 
89  /// True if this symbol can be redefined.
90  unsigned IsRedefinable : 1;
91 
92  /// IsUsed - True if this symbol has been used.
93  mutable unsigned IsUsed : 1;
94 
95  mutable unsigned IsRegistered : 1;
96 
97  /// True if this symbol is visible outside this translation unit. Note: ELF
98  /// uses binding instead of this bit.
99  mutable unsigned IsExternal : 1;
100 
101  /// This symbol is private extern.
102  mutable unsigned IsPrivateExtern : 1;
103 
104  /// LLVM RTTI discriminator. This is actually a SymbolKind enumerator, but is
105  /// unsigned to avoid sign extension and achieve better bitpacking with MSVC.
106  unsigned Kind : 3;
107 
108  /// True if we have created a relocation that uses this symbol.
109  mutable unsigned IsUsedInReloc : 1;
110 
111  /// This is actually a Contents enumerator, but is unsigned to avoid sign
112  /// extension and achieve better bitpacking with MSVC.
113  unsigned SymbolContents : 3;
114 
115  /// The alignment of the symbol, if it is 'common', or -1.
116  ///
117  /// The alignment is stored as log2(align) + 1. This allows all values from
118  /// 0 to 2^31 to be stored which is every power of 2 representable by an
119  /// unsigned.
120  enum : unsigned { NumCommonAlignmentBits = 5 };
122 
123  /// The Flags field is used by object file implementations to store
124  /// additional per symbol information which is not easily classified.
125  enum : unsigned { NumFlagsBits = 16 };
127 
128  /// Index field, for use by the object file implementation.
129  mutable uint32_t Index = 0;
130 
131  union {
132  /// The offset to apply to the fragment address to form this symbol's value.
133  uint64_t Offset;
134 
135  /// The size of the symbol, if it is 'common'.
136  uint64_t CommonSize;
137 
138  /// If non-null, the value for a variable symbol.
139  const MCExpr *Value;
140  };
141 
142  // MCContext creates and uniques these.
143  friend class MCExpr;
144  friend class MCContext;
145 
146  /// The name for a symbol.
147  /// MCSymbol contains a uint64_t so is probably aligned to 8. On a 32-bit
148  /// system, the name is a pointer so isn't going to satisfy the 8 byte
149  /// alignment of uint64_t. Account for that here.
150  using NameEntryStorageTy = union {
151  const StringMapEntry<bool> *NameEntry;
153  };
154 
159  CommonAlignLog2(0), Flags(0) {
160  Offset = 0;
161  FragmentAndHasName.setInt(!!Name);
162  if (Name)
163  getNameEntryPtr() = Name;
164  }
165 
166  // Provide custom new/delete as we will only allocate space for a name
167  // if we need one.
168  void *operator new(size_t s, const StringMapEntry<bool> *Name,
169  MCContext &Ctx);
170 
171 private:
172  void operator delete(void *);
173  /// Placement delete - required by std, but never called.
174  void operator delete(void*, unsigned) {
175  llvm_unreachable("Constructor throws?");
176  }
177  /// Placement delete - required by std, but never called.
178  void operator delete(void*, unsigned, bool) {
179  llvm_unreachable("Constructor throws?");
180  }
181 
182  /// Get a reference to the name field. Requires that we have a name
183  const StringMapEntry<bool> *&getNameEntryPtr() {
184  assert(FragmentAndHasName.getInt() && "Name is required");
185  NameEntryStorageTy *Name = reinterpret_cast<NameEntryStorageTy *>(this);
186  return (*(Name - 1)).NameEntry;
187  }
188  const StringMapEntry<bool> *&getNameEntryPtr() const {
189  return const_cast<MCSymbol*>(this)->getNameEntryPtr();
190  }
191 
192 public:
193  MCSymbol(const MCSymbol &) = delete;
194  MCSymbol &operator=(const MCSymbol &) = delete;
195 
196  /// getName - Get the symbol name.
197  StringRef getName() const {
198  if (!FragmentAndHasName.getInt())
199  return StringRef();
200 
201  return getNameEntryPtr()->first();
202  }
203 
204  bool isRegistered() const { return IsRegistered; }
205  void setIsRegistered(bool Value) const { IsRegistered = Value; }
206 
207  void setUsedInReloc() const { IsUsedInReloc = true; }
208  bool isUsedInReloc() const { return IsUsedInReloc; }
209 
210  /// \name Accessors
211  /// @{
212 
213  /// isTemporary - Check if this is an assembler temporary symbol.
214  bool isTemporary() const { return IsTemporary; }
215 
216  /// isUsed - Check if this is used.
217  bool isUsed() const { return IsUsed; }
218 
219  /// Check if this symbol is redefinable.
220  bool isRedefinable() const { return IsRedefinable; }
221  /// Mark this symbol as redefinable.
223  /// Prepare this symbol to be redefined.
225  if (IsRedefinable) {
227  Value = nullptr;
229  }
230  setUndefined();
231  IsRedefinable = false;
232  }
233  }
234 
235  /// @}
236  /// \name Associated Sections
237  /// @{
238 
239  /// isDefined - Check if this symbol is defined (i.e., it has an address).
240  ///
241  /// Defined symbols are either absolute or in some section.
242  bool isDefined() const { return !isUndefined(); }
243 
244  /// isInSection - Check if this symbol is defined in some section (i.e., it
245  /// is defined but not absolute).
246  bool isInSection() const {
247  return isDefined() && !isAbsolute();
248  }
249 
250  /// isUndefined - Check if this symbol undefined (i.e., implicitly defined).
251  bool isUndefined(bool SetUsed = true) const {
252  return getFragment(SetUsed) == nullptr;
253  }
254 
255  /// isAbsolute - Check if this is an absolute symbol.
256  bool isAbsolute() const {
258  }
259 
260  /// Get the section associated with a defined, non-absolute symbol.
262  assert(isInSection() && "Invalid accessor!");
263  return *getFragment()->getParent();
264  }
265 
266  /// Mark the symbol as defined in the fragment \p F.
267  void setFragment(MCFragment *F) const {
268  assert(!isVariable() && "Cannot set fragment of variable");
269  FragmentAndHasName.setPointer(F);
270  }
271 
272  /// Mark the symbol as undefined.
273  void setUndefined() { FragmentAndHasName.setPointer(nullptr); }
274 
275  bool isELF() const { return Kind == SymbolKindELF; }
276 
277  bool isCOFF() const { return Kind == SymbolKindCOFF; }
278 
279  bool isMachO() const { return Kind == SymbolKindMachO; }
280 
281  bool isWasm() const { return Kind == SymbolKindWasm; }
282 
283  bool isXCOFF() const { return Kind == SymbolKindXCOFF; }
284 
285  /// @}
286  /// \name Variable Symbols
287  /// @{
288 
289  /// isVariable - Check if this is a variable symbol.
290  bool isVariable() const {
292  }
293 
294  /// getVariableValue - Get the value for variable symbols.
295  const MCExpr *getVariableValue(bool SetUsed = true) const {
296  assert(isVariable() && "Invalid accessor!");
297  IsUsed |= SetUsed;
298  return Value;
299  }
300 
301  void setVariableValue(const MCExpr *Value);
302 
303  /// @}
304 
305  /// Get the (implementation defined) index.
306  uint32_t getIndex() const {
307  return Index;
308  }
309 
310  /// Set the (implementation defined) index.
311  void setIndex(uint32_t Value) const {
312  Index = Value;
313  }
314 
315  bool isUnset() const { return SymbolContents == SymContentsUnset; }
316 
317  uint64_t getOffset() const {
320  "Cannot get offset for a common/variable symbol");
321  return Offset;
322  }
323  void setOffset(uint64_t Value) {
326  "Cannot set offset for a common/variable symbol");
327  Offset = Value;
329  }
330 
331  /// Return the size of a 'common' symbol.
332  uint64_t getCommonSize() const {
333  assert(isCommon() && "Not a 'common' symbol!");
334  return CommonSize;
335  }
336 
337  /// Mark this symbol as being 'common'.
338  ///
339  /// \param Size - The size of the symbol.
340  /// \param Align - The alignment of the symbol.
341  /// \param Target - Is the symbol a target-specific common-like symbol.
342  void setCommon(uint64_t Size, unsigned Align, bool Target = false) {
343  assert(getOffset() == 0);
344  CommonSize = Size;
346 
347  assert((!Align || isPowerOf2_32(Align)) &&
348  "Alignment must be a power of 2");
349  unsigned Log2Align = Log2_32(Align) + 1;
350  assert(Log2Align < (1U << NumCommonAlignmentBits) &&
351  "Out of range alignment");
352  CommonAlignLog2 = Log2Align;
353  }
354 
355  /// Return the alignment of a 'common' symbol.
356  unsigned getCommonAlignment() const {
357  assert(isCommon() && "Not a 'common' symbol!");
358  return CommonAlignLog2 ? (1U << (CommonAlignLog2 - 1)) : 0;
359  }
360 
361  /// Declare this symbol as being 'common'.
362  ///
363  /// \param Size - The size of the symbol.
364  /// \param Align - The alignment of the symbol.
365  /// \param Target - Is the symbol a target-specific common-like symbol.
366  /// \return True if symbol was already declared as a different type
367  bool declareCommon(uint64_t Size, unsigned Align, bool Target = false) {
368  assert(isCommon() || getOffset() == 0);
369  if(isCommon()) {
370  if (CommonSize != Size || getCommonAlignment() != Align ||
371  isTargetCommon() != Target)
372  return true;
373  } else
375  return false;
376  }
377 
378  /// Is this a 'common' symbol.
379  bool isCommon() const {
380  return SymbolContents == SymContentsCommon ||
382  }
383 
384  /// Is this a target-specific common-like symbol.
385  bool isTargetCommon() const {
387  }
388 
389  MCFragment *getFragment(bool SetUsed = true) const {
390  MCFragment *Fragment = FragmentAndHasName.getPointer();
391  if (Fragment || !isVariable())
392  return Fragment;
393  Fragment = getVariableValue(SetUsed)->findAssociatedFragment();
394  FragmentAndHasName.setPointer(Fragment);
395  return Fragment;
396  }
397 
398  bool isExternal() const { return IsExternal; }
399  void setExternal(bool Value) const { IsExternal = Value; }
400 
401  bool isPrivateExtern() const { return IsPrivateExtern; }
403 
404  /// print - Print the value to the stream \p OS.
405  void print(raw_ostream &OS, const MCAsmInfo *MAI) const;
406 
407  /// dump - Print the value to stderr.
408  void dump() const;
409 
410 protected:
411  /// Get the (implementation defined) symbol flags.
412  uint32_t getFlags() const { return Flags; }
413 
414  /// Set the (implementation defined) symbol flags.
415  void setFlags(uint32_t Value) const {
416  assert(Value < (1U << NumFlagsBits) && "Out of range flags");
417  Flags = Value;
418  }
419 
420  /// Modify the flags via a mask
422  assert(Value < (1U << NumFlagsBits) && "Out of range flags");
423  Flags = (Flags & ~Mask) | Value;
424  }
425 };
426 
427 inline raw_ostream &operator<<(raw_ostream &OS, const MCSymbol &Sym) {
428  Sym.print(OS, nullptr);
429  return OS;
430 }
431 
432 } // end namespace llvm
433 
434 #endif // LLVM_MC_MCSYMBOL_H
llvm::Check::Size
@ Size
Definition: FileCheck.h:73
MathExtras.h
llvm
Definition: AllocatorList.h:23
llvm::MCSymbol::setOffset
void setOffset(uint64_t Value)
Definition: MCSymbol.h:323
llvm::MCSymbol
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
llvm::StringMapEntry
StringMapEntry - This is used to represent one value that is inserted into a StringMap.
Definition: StringMapEntry.h:98
llvm::MCSymbol::SymbolKindUnset
@ SymbolKindUnset
Definition: MCSymbol.h:46
llvm::MCSymbol::isExternal
bool isExternal() const
Definition: MCSymbol.h:398
llvm::MCSymbol::isTemporary
bool isTemporary() const
isTemporary - Check if this is an assembler temporary symbol.
Definition: MCSymbol.h:214
llvm::MCContext
Context object for machine code objects.
Definition: MCContext.h:71
StringRef.h
llvm::MCSymbol::Flags
uint32_t Flags
Definition: MCSymbol.h:126
llvm::MCSymbol::getOffset
uint64_t getOffset() const
Definition: MCSymbol.h:317
llvm::MCSymbol::setFlags
void setFlags(uint32_t Value) const
Set the (implementation defined) symbol flags.
Definition: MCSymbol.h:415
llvm::MCSymbol::SymContentsTargetCommon
@ SymContentsTargetCommon
Definition: MCSymbol.h:61
llvm::MCAsmInfo
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
llvm::Target
Target - Wrapper for Target specific information.
Definition: TargetRegistry.h:124
llvm::MCSymbol::NumFlagsBits
@ NumFlagsBits
Definition: MCSymbol.h:125
llvm::MCSymbol::AbsolutePseudoFragment
static MCFragment * AbsolutePseudoFragment
Definition: MCSymbol.h:65
ErrorHandling.h
MCFragment.h
llvm::MCSymbol::isUndefined
bool isUndefined(bool SetUsed=true) const
isUndefined - Check if this symbol undefined (i.e., implicitly defined).
Definition: MCSymbol.h:251
llvm::MCSymbol::SymContentsUnset
@ SymContentsUnset
Definition: MCSymbol.h:57
llvm::MCSymbol::setUndefined
void setUndefined()
Mark the symbol as undefined.
Definition: MCSymbol.h:273
llvm::MCSymbol::getFragment
MCFragment * getFragment(bool SetUsed=true) const
Definition: MCSymbol.h:389
llvm::MCSymbol::IsUsed
unsigned IsUsed
IsUsed - True if this symbol has been used.
Definition: MCSymbol.h:93
llvm::MCSymbol::isDefined
bool isDefined() const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:242
llvm::MCSymbol::isUsed
bool isUsed() const
isUsed - Check if this is used.
Definition: MCSymbol.h:217
llvm::MCSymbol::IsExternal
unsigned IsExternal
True if this symbol is visible outside this translation unit.
Definition: MCSymbol.h:99
llvm::MCSymbol::isAbsolute
bool isAbsolute() const
isAbsolute - Check if this is an absolute symbol.
Definition: MCSymbol.h:256
llvm::MCFragment::getParent
MCSection * getParent() const
Definition: MCFragment.h:96
llvm::MCSymbol::SymbolContents
unsigned SymbolContents
This is actually a Contents enumerator, but is unsigned to avoid sign extension and achieve better bi...
Definition: MCSymbol.h:113
llvm::MCSymbol::SymContentsCommon
@ SymContentsCommon
Definition: MCSymbol.h:60
llvm::MCSymbol::setIsRegistered
void setIsRegistered(bool Value) const
Definition: MCSymbol.h:205
llvm::MCSymbol::isRegistered
bool isRegistered() const
Definition: MCSymbol.h:204
llvm::MCSymbol::setVariableValue
void setVariableValue(const MCExpr *Value)
Definition: MCSymbol.cpp:48
llvm::isPowerOf2_32
constexpr bool isPowerOf2_32(uint32_t Value)
Return true if the argument is a power of two > 0.
Definition: MathExtras.h:491
llvm::BitmaskEnumDetail::Mask
std::underlying_type_t< E > Mask()
Get a bitmask with 1s in all places up to the high-order bit of E's largest value.
Definition: BitmaskEnum.h:80
llvm::MCSymbol::dump
void dump() const
dump - Print the value to stderr.
Definition: MCSymbol.cpp:85
F
#define F(x, y, z)
Definition: MD5.cpp:56
llvm::MCSymbol::SymbolKindMachO
@ SymbolKindMachO
Definition: MCSymbol.h:49
llvm::MCSymbol::SymContentsOffset
@ SymContentsOffset
Definition: MCSymbol.h:58
llvm::MCSymbol::SymbolKindELF
@ SymbolKindELF
Definition: MCSymbol.h:48
PointerIntPair.h
llvm::MCSymbol::IsRedefinable
unsigned IsRedefinable
True if this symbol can be redefined.
Definition: MCSymbol.h:90
llvm::MCFragment
Definition: MCFragment.h:31
llvm::MCSymbol::isMachO
bool isMachO() const
Definition: MCSymbol.h:279
llvm::MCSymbol::getSection
MCSection & getSection() const
Get the section associated with a defined, non-absolute symbol.
Definition: MCSymbol.h:261
llvm::MCSymbol::CommonAlignLog2
unsigned CommonAlignLog2
Definition: MCSymbol.h:121
llvm::MCSymbol::isUsedInReloc
bool isUsedInReloc() const
Definition: MCSymbol.h:208
llvm::MCSymbol::SymbolKindCOFF
@ SymbolKindCOFF
Definition: MCSymbol.h:47
llvm::MCSymbol::isUnset
bool isUnset() const
Definition: MCSymbol.h:315
llvm::MCSymbol::Contents
Contents
A symbol can contain an Offset, or Value, or be Common, but never more than one of these.
Definition: MCSymbol.h:56
false
Definition: StackSlotColoring.cpp:142
llvm::MCSymbol::getVariableValue
const MCExpr * getVariableValue(bool SetUsed=true) const
getVariableValue - Get the value for variable symbols.
Definition: MCSymbol.h:295
llvm::Log2_32
unsigned Log2_32(uint32_t Value)
Return the floor log base 2 of the specified value, -1 if the value is zero.
Definition: MathExtras.h:596
llvm::MCSymbol::isPrivateExtern
bool isPrivateExtern() const
Definition: MCSymbol.h:401
llvm::MCSymbol::operator=
MCSymbol & operator=(const MCSymbol &)=delete
llvm::MCSymbol::isTargetCommon
bool isTargetCommon() const
Is this a target-specific common-like symbol.
Definition: MCSymbol.h:385
llvm::raw_ostream
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:50
llvm::MCSymbol::setIndex
void setIndex(uint32_t Value) const
Set the (implementation defined) index.
Definition: MCSymbol.h:311
llvm::operator<<
raw_ostream & operator<<(raw_ostream &OS, const APFixedPoint &FX)
Definition: APFixedPoint.h:230
llvm::MCSymbol::getName
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:197
StringMap.h
llvm::Align
This struct is a compact representation of a valid (non-zero power of two) alignment.
Definition: Alignment.h:39
llvm::MCSymbol::print
void print(raw_ostream &OS, const MCAsmInfo *MAI) const
print - Print the value to the stream OS.
Definition: MCSymbol.cpp:59
llvm::MCSymbol::MCSymbol
MCSymbol(SymbolKind Kind, const StringMapEntry< bool > *Name, bool isTemporary)
Definition: MCSymbol.h:155
llvm::MCSymbol::Value
const MCExpr * Value
If non-null, the value for a variable symbol.
Definition: MCSymbol.h:139
llvm::MCSymbol::getIndex
uint32_t getIndex() const
Get the (implementation defined) index.
Definition: MCSymbol.h:306
llvm::MCSymbol::setPrivateExtern
void setPrivateExtern(bool Value)
Definition: MCSymbol.h:402
llvm::MCSymbol::NumCommonAlignmentBits
@ NumCommonAlignmentBits
Definition: MCSymbol.h:120
llvm::MCSymbol::AlignmentPadding
uint64_t AlignmentPadding
Definition: MCSymbol.h:152
llvm::MCSymbol::isCOFF
bool isCOFF() const
Definition: MCSymbol.h:277
llvm::MCSymbol::isELF
bool isELF() const
Definition: MCSymbol.h:275
llvm::MCSymbol::FragmentAndHasName
PointerIntPair< MCFragment *, 1 > FragmentAndHasName
If a symbol has a Fragment, the section is implied, so we only need one pointer.
Definition: MCSymbol.h:82
llvm::MCSymbol::SymbolKindWasm
@ SymbolKindWasm
Definition: MCSymbol.h:50
llvm::MCSymbol::NameEntryStorageTy
union { const StringMapEntry< bool > *NameEntry NameEntryStorageTy
The name for a symbol.
Definition: MCSymbol.h:151
s
multiplies can be turned into SHL s
Definition: README.txt:370
llvm::MCSymbol::isWasm
bool isWasm() const
Definition: MCSymbol.h:281
llvm::MCSymbol::modifyFlags
void modifyFlags(uint32_t Value, uint32_t Mask) const
Modify the flags via a mask.
Definition: MCSymbol.h:421
llvm::MCSymbol::IsTemporary
unsigned IsTemporary
IsTemporary - True if this is an assembler temporary label, which typically does not survive in the ....
Definition: MCSymbol.h:87
llvm::MCSymbol::IsRegistered
unsigned IsRegistered
Definition: MCSymbol.h:95
llvm::MCSymbol::getFlags
uint32_t getFlags() const
Get the (implementation defined) symbol flags.
Definition: MCSymbol.h:412
llvm::MCSymbol::isVariable
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:290
llvm::MCSymbol::setUsedInReloc
void setUsedInReloc() const
Definition: MCSymbol.h:207
assert
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
llvm::MCSymbol::isCommon
bool isCommon() const
Is this a 'common' symbol.
Definition: MCSymbol.h:379
llvm::MCSymbol::isRedefinable
bool isRedefinable() const
Check if this symbol is redefinable.
Definition: MCSymbol.h:220
llvm::MCSymbol::redefineIfPossible
void redefineIfPossible()
Prepare this symbol to be redefined.
Definition: MCSymbol.h:224
llvm::MCSymbol::setCommon
void setCommon(uint64_t Size, unsigned Align, bool Target=false)
Mark this symbol as being 'common'.
Definition: MCSymbol.h:342
llvm::StringRef
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:57
llvm::MCSymbol::IsPrivateExtern
unsigned IsPrivateExtern
This symbol is private extern.
Definition: MCSymbol.h:102
llvm_unreachable
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:136
llvm::MCSymbol::SymbolKind
SymbolKind
The kind of the symbol.
Definition: MCSymbol.h:45
uint32_t
llvm::MCSymbol::SymbolKindXCOFF
@ SymbolKindXCOFF
Definition: MCSymbol.h:51
llvm::MCSection
Instances of this class represent a uniqued identifier for a section in the current translation unit.
Definition: MCSection.h:39
llvm::MCSymbol::declareCommon
bool declareCommon(uint64_t Size, unsigned Align, bool Target=false)
Declare this symbol as being 'common'.
Definition: MCSymbol.h:367
llvm::MCSymbol::getCommonAlignment
unsigned getCommonAlignment() const
Return the alignment of a 'common' symbol.
Definition: MCSymbol.h:356
llvm::MCSymbol::CommonSize
uint64_t CommonSize
The size of the symbol, if it is 'common'.
Definition: MCSymbol.h:136
llvm::MCSymbol::setExternal
void setExternal(bool Value) const
Definition: MCSymbol.h:399
llvm::GraphProgram::Name
Name
Definition: GraphWriter.h:52
llvm::PointerIntPair
PointerIntPair - This class implements a pair of a pointer and small integer.
Definition: PointerIntPair.h:45
llvm::MCSymbol::setFragment
void setFragment(MCFragment *F) const
Mark the symbol as defined in the fragment F.
Definition: MCSymbol.h:267
llvm::MCSymbol::IsUsedInReloc
unsigned IsUsedInReloc
True if we have created a relocation that uses this symbol.
Definition: MCSymbol.h:109
llvm::MCSymbol::isInSection
bool isInSection() const
isInSection - Check if this symbol is defined in some section (i.e., it is defined but not absolute).
Definition: MCSymbol.h:246
llvm::MCExpr::findAssociatedFragment
MCFragment * findAssociatedFragment() const
Find the "associated section" for this expression, which is currently defined as the absolute section...
Definition: MCExpr.cpp:1004
llvm::MCSymbol::SymContentsVariable
@ SymContentsVariable
Definition: MCSymbol.h:59
llvm::MCSymbol::isXCOFF
bool isXCOFF() const
Definition: MCSymbol.h:283
llvm::MCSymbol::Index
uint32_t Index
Index field, for use by the object file implementation.
Definition: MCSymbol.h:129
llvm::MCSymbol::Offset
uint64_t Offset
The offset to apply to the fragment address to form this symbol's value.
Definition: MCSymbol.h:133
llvm::MCSymbol::getCommonSize
uint64_t getCommonSize() const
Return the size of a 'common' symbol.
Definition: MCSymbol.h:332
llvm::MCSymbol::Kind
unsigned Kind
LLVM RTTI discriminator.
Definition: MCSymbol.h:106
MCExpr.h
llvm::MCSymbol::setRedefinable
void setRedefinable(bool Value)
Mark this symbol as redefinable.
Definition: MCSymbol.h:222
llvm::Value
LLVM Value Representation.
Definition: Value.h:75
llvm::MCExpr
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35