lib/IR/DebugInfoMetadata.cpp

   1 //===- DebugInfoMetadata.cpp - Implement debug info metadata --------------===//
   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 implements the debug info Metadata classes.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/IR/DebugInfoMetadata.h"
  15 #include "LLVMContextImpl.h"
  16 #include "MetadataImpl.h"
  17 #include "llvm/IR/Function.h"
  18
  19 using namespace llvm;
  20
  21 MDLocation::MDLocation(LLVMContext &C, StorageType Storage, unsigned Line,
  22                        unsigned Column, ArrayRef<Metadata *> MDs)
  23     : MDNode(C, MDLocationKind, Storage, MDs) {
  24   assert((MDs.size() == 1 || MDs.size() == 2) &&
  25          "Expected a scope and optional inlined-at");
  26
  27   // Set line and column.
  28   assert(Column < (1u << 16) && "Expected 16-bit column");
  29
  30   SubclassData32 = Line;
  31   SubclassData16 = Column;
  32 }
  33
  34 static void adjustColumn(unsigned &Column) {
  35   // Set to unknown on overflow.  We only have 16 bits to play with here.
  36   if (Column >= (1u << 16))
  37     Column = 0;
  38 }
  39
  40 MDLocation *MDLocation::getImpl(LLVMContext &Context, unsigned Line,
  41                                 unsigned Column, Metadata *Scope,
  42                                 Metadata *InlinedAt, StorageType Storage,
  43                                 bool ShouldCreate) {
  44   // Fixup column.
  45   adjustColumn(Column);
  46
  47   if (Storage == Uniqued) {
  48     if (auto *N =
  49             getUniqued(Context.pImpl->MDLocations,
  50                        MDLocationInfo::KeyTy(Line, Column, Scope, InlinedAt)))
  51       return N;
  52     if (!ShouldCreate)
  53       return nullptr;
  54   } else {
  55     assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
  56   }
  57
  58   SmallVector<Metadata *, 2> Ops;
  59   Ops.push_back(Scope);
  60   if (InlinedAt)
  61     Ops.push_back(InlinedAt);
  62   return storeImpl(new (Ops.size())
  63                        MDLocation(Context, Storage, Line, Column, Ops),
  64                    Storage, Context.pImpl->MDLocations);
  65 }
  66
  67 static StringRef getString(const MDString *S) {
  68   if (S)
  69     return S->getString();
  70   return StringRef();
  71 }
  72
  73 #ifndef NDEBUG
  74 static bool isCanonical(const MDString *S) {
  75   return !S || !S->getString().empty();
  76 }
  77 #endif
  78
  79 GenericDebugNode *GenericDebugNode::getImpl(LLVMContext &Context, unsigned Tag,
  80                                             MDString *Header,
  81                                             ArrayRef<Metadata *> DwarfOps,
  82                                             StorageType Storage,
  83                                             bool ShouldCreate) {
  84   unsigned Hash = 0;
  85   if (Storage == Uniqued) {
  86     GenericDebugNodeInfo::KeyTy Key(Tag, getString(Header), DwarfOps);
  87     if (auto *N = getUniqued(Context.pImpl->GenericDebugNodes, Key))
  88       return N;
  89     if (!ShouldCreate)
  90       return nullptr;
  91     Hash = Key.getHash();
  92   } else {
  93     assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
  94   }
  95
  96   // Use a nullptr for empty headers.
  97   assert(isCanonical(Header) && "Expected canonical MDString");
  98   Metadata *PreOps[] = {Header};
  99   return storeImpl(new (DwarfOps.size() + 1) GenericDebugNode(
 100                        Context, Storage, Hash, Tag, PreOps, DwarfOps),
 101                    Storage, Context.pImpl->GenericDebugNodes);
 102 }
 103
 104 void GenericDebugNode::recalculateHash() {
 105   setHash(GenericDebugNodeInfo::KeyTy::calculateHash(this));
 106 }
 107
 108 #define UNWRAP_ARGS_IMPL(...) __VA_ARGS__
 109 #define UNWRAP_ARGS(ARGS) UNWRAP_ARGS_IMPL ARGS
 110 #define DEFINE_GETIMPL_LOOKUP(CLASS, ARGS)                                     \
 111   do {                                                                         \
 112     if (Storage == Uniqued) {                                                  \
 113       if (auto *N = getUniqued(Context.pImpl->CLASS##s,                        \
 114                                CLASS##Info::KeyTy(UNWRAP_ARGS(ARGS))))         \
 115         return N;                                                              \
 116       if (!ShouldCreate)                                                       \
 117         return nullptr;                                                        \
 118     } else {                                                                   \
 119       assert(ShouldCreate &&                                                   \
 120              "Expected non-uniqued nodes to always be created");               \
 121     }                                                                          \
 122   } while (false)
 123 #define DEFINE_GETIMPL_STORE(CLASS, ARGS, OPS)                                 \
 124   return storeImpl(new (ArrayRef<Metadata *>(OPS).size())                      \
 125                        CLASS(Context, Storage, UNWRAP_ARGS(ARGS), OPS),        \
 126                    Storage, Context.pImpl->CLASS##s)
 127 #define DEFINE_GETIMPL_STORE_NO_OPS(CLASS, ARGS)                               \
 128   return storeImpl(new (0u) CLASS(Context, Storage, UNWRAP_ARGS(ARGS)),        \
 129                    Storage, Context.pImpl->CLASS##s)
 130 #define DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(CLASS, OPS)                   \
 131   return storeImpl(new (ArrayRef<Metadata *>(OPS).size())                      \
 132                        CLASS(Context, Storage, OPS),                           \
 133                    Storage, Context.pImpl->CLASS##s)
 134
 135 MDSubrange *MDSubrange::getImpl(LLVMContext &Context, int64_t Count, int64_t Lo,
 136                                 StorageType Storage, bool ShouldCreate) {
 137   DEFINE_GETIMPL_LOOKUP(MDSubrange, (Count, Lo));
 138   DEFINE_GETIMPL_STORE_NO_OPS(MDSubrange, (Count, Lo));
 139 }
 140
 141 MDEnumerator *MDEnumerator::getImpl(LLVMContext &Context, int64_t Value,
 142                                     MDString *Name, StorageType Storage,
 143                                     bool ShouldCreate) {
 144   assert(isCanonical(Name) && "Expected canonical MDString");
 145   DEFINE_GETIMPL_LOOKUP(MDEnumerator, (Value, getString(Name)));
 146   Metadata *Ops[] = {Name};
 147   DEFINE_GETIMPL_STORE(MDEnumerator, (Value), Ops);
 148 }
 149
 150 MDBasicType *MDBasicType::getImpl(LLVMContext &Context, unsigned Tag,
 151                                   MDString *Name, uint64_t SizeInBits,
 152                                   uint64_t AlignInBits, unsigned Encoding,
 153                                   StorageType Storage, bool ShouldCreate) {
 154   assert(isCanonical(Name) && "Expected canonical MDString");
 155   DEFINE_GETIMPL_LOOKUP(
 156       MDBasicType, (Tag, getString(Name), SizeInBits, AlignInBits, Encoding));
 157   Metadata *Ops[] = {nullptr, nullptr, Name};
 158   DEFINE_GETIMPL_STORE(MDBasicType, (Tag, SizeInBits, AlignInBits, Encoding),
 159                        Ops);
 160 }
 161
 162 MDDerivedType *MDDerivedType::getImpl(
 163     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
 164     unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
 165     uint64_t AlignInBits, uint64_t OffsetInBits, unsigned Flags,
 166     Metadata *ExtraData, StorageType Storage, bool ShouldCreate) {
 167   assert(isCanonical(Name) && "Expected canonical MDString");
 168   DEFINE_GETIMPL_LOOKUP(MDDerivedType, (Tag, getString(Name), File, Line, Scope,
 169                                         BaseType, SizeInBits, AlignInBits,
 170                                         OffsetInBits, Flags, ExtraData));
 171   Metadata *Ops[] = {File, Scope, Name, BaseType, ExtraData};
 172   DEFINE_GETIMPL_STORE(
 173       MDDerivedType, (Tag, Line, SizeInBits, AlignInBits, OffsetInBits, Flags),
 174       Ops);
 175 }
 176
 177 MDCompositeType *MDCompositeType::getImpl(
 178     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
 179     unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
 180     uint64_t AlignInBits, uint64_t OffsetInBits, unsigned Flags,
 181     Metadata *Elements, unsigned RuntimeLang, Metadata *VTableHolder,
 182     Metadata *TemplateParams, MDString *Identifier, StorageType Storage,
 183     bool ShouldCreate) {
 184   assert(isCanonical(Name) && "Expected canonical MDString");
 185   DEFINE_GETIMPL_LOOKUP(MDCompositeType,
 186                         (Tag, getString(Name), File, Line, Scope, BaseType,
 187                          SizeInBits, AlignInBits, OffsetInBits, Flags, Elements,
 188                          RuntimeLang, VTableHolder, TemplateParams,
 189                          getString(Identifier)));
 190   Metadata *Ops[] = {File,     Scope,        Name,           BaseType,
 191                      Elements, VTableHolder, TemplateParams, Identifier};
 192   DEFINE_GETIMPL_STORE(MDCompositeType, (Tag, Line, RuntimeLang, SizeInBits,
 193                                          AlignInBits, OffsetInBits, Flags),
 194                        Ops);
 195 }
 196
 197 MDSubroutineType *MDSubroutineType::getImpl(LLVMContext &Context,
 198                                             unsigned Flags, Metadata *TypeArray,
 199                                             StorageType Storage,
 200                                             bool ShouldCreate) {
 201   DEFINE_GETIMPL_LOOKUP(MDSubroutineType, (Flags, TypeArray));
 202   Metadata *Ops[] = {nullptr,   nullptr, nullptr, nullptr,
 203                      TypeArray, nullptr, nullptr, nullptr};
 204   DEFINE_GETIMPL_STORE(MDSubroutineType, (Flags), Ops);
 205 }
 206
 207 MDFile *MDFile::getImpl(LLVMContext &Context, MDString *Filename,
 208                         MDString *Directory, StorageType Storage,
 209                         bool ShouldCreate) {
 210   assert(isCanonical(Filename) && "Expected canonical MDString");
 211   assert(isCanonical(Directory) && "Expected canonical MDString");
 212   DEFINE_GETIMPL_LOOKUP(MDFile, (getString(Filename), getString(Directory)));
 213   Metadata *Ops[] = {Filename, Directory};
 214   DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(MDFile, Ops);
 215 }
 216
 217 MDCompileUnit *MDCompileUnit::getImpl(
 218     LLVMContext &Context, unsigned SourceLanguage, Metadata *File,
 219     MDString *Producer, bool IsOptimized, MDString *Flags,
 220     unsigned RuntimeVersion, MDString *SplitDebugFilename,
 221     unsigned EmissionKind, Metadata *EnumTypes, Metadata *RetainedTypes,
 222     Metadata *Subprograms, Metadata *GlobalVariables,
 223     Metadata *ImportedEntities, StorageType Storage, bool ShouldCreate) {
 224   assert(isCanonical(Producer) && "Expected canonical MDString");
 225   assert(isCanonical(Flags) && "Expected canonical MDString");
 226   assert(isCanonical(SplitDebugFilename) && "Expected canonical MDString");
 227   DEFINE_GETIMPL_LOOKUP(
 228       MDCompileUnit,
 229       (SourceLanguage, File, getString(Producer), IsOptimized, getString(Flags),
 230        RuntimeVersion, getString(SplitDebugFilename), EmissionKind, EnumTypes,
 231        RetainedTypes, Subprograms, GlobalVariables, ImportedEntities));
 232   Metadata *Ops[] = {File, Producer, Flags, SplitDebugFilename, EnumTypes,
 233                      RetainedTypes, Subprograms, GlobalVariables,
 234                      ImportedEntities};
 235   DEFINE_GETIMPL_STORE(
 236       MDCompileUnit,
 237       (SourceLanguage, IsOptimized, RuntimeVersion, EmissionKind), Ops);
 238 }
 239
 240 MDSubprogram *MDSubprogram::getImpl(
 241     LLVMContext &Context, Metadata *Scope, MDString *Name,
 242     MDString *LinkageName, Metadata *File, unsigned Line, Metadata *Type,
 243     bool IsLocalToUnit, bool IsDefinition, unsigned ScopeLine,
 244     Metadata *ContainingType, unsigned Virtuality, unsigned VirtualIndex,
 245     unsigned Flags, bool IsOptimized, Metadata *Function,
 246     Metadata *TemplateParams, Metadata *Declaration, Metadata *Variables,
 247     StorageType Storage, bool ShouldCreate) {
 248   assert(isCanonical(Name) && "Expected canonical MDString");
 249   assert(isCanonical(LinkageName) && "Expected canonical MDString");
 250   DEFINE_GETIMPL_LOOKUP(MDSubprogram,
 251                         (Scope, getString(Name), getString(LinkageName), File,
 252                          Line, Type, IsLocalToUnit, IsDefinition, ScopeLine,
 253                          ContainingType, Virtuality, VirtualIndex, Flags,
 254                          IsOptimized, Function, TemplateParams, Declaration,
 255                          Variables));
 256   Metadata *Ops[] = {File,           Scope,       Name,           Name,
 257                      LinkageName,    Type,        ContainingType, Function,
 258                      TemplateParams, Declaration, Variables};
 259   DEFINE_GETIMPL_STORE(MDSubprogram,
 260                        (Line, ScopeLine, Virtuality, VirtualIndex, Flags,
 261                         IsLocalToUnit, IsDefinition, IsOptimized),
 262                        Ops);
 263 }
 264
 265 void MDSubprogram::replaceFunction(Function *F) {
 266   replaceFunction(F ? ConstantAsMetadata::get(F)
 267                     : static_cast<ConstantAsMetadata *>(nullptr));
 268 }
 269
 270 MDLexicalBlock *MDLexicalBlock::getImpl(LLVMContext &Context, Metadata *Scope,
 271                                         Metadata *File, unsigned Line,
 272                                         unsigned Column, StorageType Storage,
 273                                         bool ShouldCreate) {
 274   DEFINE_GETIMPL_LOOKUP(MDLexicalBlock, (Scope, File, Line, Column));
 275   Metadata *Ops[] = {File, Scope};
 276   DEFINE_GETIMPL_STORE(MDLexicalBlock, (Line, Column), Ops);
 277 }
 278
 279 MDLexicalBlockFile *MDLexicalBlockFile::getImpl(LLVMContext &Context,
 280                                                 Metadata *Scope, Metadata *File,
 281                                                 unsigned Discriminator,
 282                                                 StorageType Storage,
 283                                                 bool ShouldCreate) {
 284   DEFINE_GETIMPL_LOOKUP(MDLexicalBlockFile, (Scope, File, Discriminator));
 285   Metadata *Ops[] = {File, Scope};
 286   DEFINE_GETIMPL_STORE(MDLexicalBlockFile, (Discriminator), Ops);
 287 }
 288
 289 MDNamespace *MDNamespace::getImpl(LLVMContext &Context, Metadata *Scope,
 290                                   Metadata *File, MDString *Name, unsigned Line,
 291                                   StorageType Storage, bool ShouldCreate) {
 292   assert(isCanonical(Name) && "Expected canonical MDString");
 293   DEFINE_GETIMPL_LOOKUP(MDNamespace, (Scope, File, getString(Name), Line));
 294   Metadata *Ops[] = {File, Scope, Name};
 295   DEFINE_GETIMPL_STORE(MDNamespace, (Line), Ops);
 296 }
 297
 298 MDTemplateTypeParameter *MDTemplateTypeParameter::getImpl(LLVMContext &Context,
 299                                                           MDString *Name,
 300                                                           Metadata *Type,
 301                                                           StorageType Storage,
 302                                                           bool ShouldCreate) {
 303   assert(isCanonical(Name) && "Expected canonical MDString");
 304   DEFINE_GETIMPL_LOOKUP(MDTemplateTypeParameter, (getString(Name), Type));
 305   Metadata *Ops[] = {Name, Type};
 306   DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(MDTemplateTypeParameter, Ops);
 307 }
 308
 309 MDTemplateValueParameter *MDTemplateValueParameter::getImpl(
 310     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *Type,
 311     Metadata *Value, StorageType Storage, bool ShouldCreate) {
 312   assert(isCanonical(Name) && "Expected canonical MDString");
 313   DEFINE_GETIMPL_LOOKUP(MDTemplateValueParameter,
 314                         (Tag, getString(Name), Type, Value));
 315   Metadata *Ops[] = {Name, Type, Value};
 316   DEFINE_GETIMPL_STORE(MDTemplateValueParameter, (Tag), Ops);
 317 }
 318
 319 MDGlobalVariable *
 320 MDGlobalVariable::getImpl(LLVMContext &Context, Metadata *Scope, MDString *Name,
 321                           MDString *LinkageName, Metadata *File, unsigned Line,
 322                           Metadata *Type, bool IsLocalToUnit, bool IsDefinition,
 323                           Metadata *Variable,
 324                           Metadata *StaticDataMemberDeclaration,
 325                           StorageType Storage, bool ShouldCreate) {
 326   assert(isCanonical(Name) && "Expected canonical MDString");
 327   assert(isCanonical(LinkageName) && "Expected canonical MDString");
 328   DEFINE_GETIMPL_LOOKUP(MDGlobalVariable,
 329                         (Scope, getString(Name), getString(LinkageName), File,
 330                          Line, Type, IsLocalToUnit, IsDefinition, Variable,
 331                          StaticDataMemberDeclaration));
 332   Metadata *Ops[] = {Scope, Name,        File,     Type,
 333                      Name,  LinkageName, Variable, StaticDataMemberDeclaration};
 334   DEFINE_GETIMPL_STORE(MDGlobalVariable, (Line, IsLocalToUnit, IsDefinition),
 335                        Ops);
 336 }
 337
 338 MDLocalVariable *MDLocalVariable::getImpl(
 339     LLVMContext &Context, unsigned Tag, Metadata *Scope, MDString *Name,
 340     Metadata *File, unsigned Line, Metadata *Type, unsigned Arg, unsigned Flags,
 341     Metadata *InlinedAt, StorageType Storage, bool ShouldCreate) {
 342   // Truncate Arg to 8 bits.
 343   //
 344   // FIXME: This is gross (and should be changed to an assert or removed), but
 345   // it matches historical behaviour for now.
 346   Arg &= (1u << 8) - 1;
 347
 348   assert(isCanonical(Name) && "Expected canonical MDString");
 349   DEFINE_GETIMPL_LOOKUP(MDLocalVariable, (Tag, Scope, getString(Name), File,
 350                                           Line, Type, Arg, Flags, InlinedAt));
 351   Metadata *Ops[] = {Scope, Name, File, Type, InlinedAt};
 352   DEFINE_GETIMPL_STORE(MDLocalVariable, (Tag, Line, Arg, Flags), Ops);
 353 }
 354
 355 MDExpression *MDExpression::getImpl(LLVMContext &Context,
 356                                     ArrayRef<uint64_t> Elements,
 357                                     StorageType Storage, bool ShouldCreate) {
 358   DEFINE_GETIMPL_LOOKUP(MDExpression, (Elements));
 359   DEFINE_GETIMPL_STORE_NO_OPS(MDExpression, (Elements));
 360 }
 361
 362 unsigned MDExpression::ExprOperand::getSize() const {
 363   switch (getOp()) {
 364   case dwarf::DW_OP_bit_piece:
 365     return 3;
 366   case dwarf::DW_OP_plus:
 367     return 2;
 368   default:
 369     return 1;
 370   }
 371 }
 372
 373 bool MDExpression::isValid() const {
 374   for (auto I = expr_op_begin(), E = expr_op_end(); I != E; ++I) {
 375     // Check that there's space for the operand.
 376     if (I->get() + I->getSize() > E->get())
 377       return false;
 378
 379     // Check that the operand is valid.
 380     switch (I->getOp()) {
 381     default:
 382       return false;
 383     case dwarf::DW_OP_bit_piece:
 384       // Piece expressions must be at the end.
 385       return I->get() + I->getSize() == E->get();
 386     case dwarf::DW_OP_plus:
 387     case dwarf::DW_OP_deref:
 388       break;
 389     }
 390   }
 391   return true;
 392 }
 393
 394 MDObjCProperty *MDObjCProperty::getImpl(
 395     LLVMContext &Context, MDString *Name, Metadata *File, unsigned Line,
 396     MDString *GetterName, MDString *SetterName, unsigned Attributes,
 397     Metadata *Type, StorageType Storage, bool ShouldCreate) {
 398   assert(isCanonical(Name) && "Expected canonical MDString");
 399   assert(isCanonical(GetterName) && "Expected canonical MDString");
 400   assert(isCanonical(SetterName) && "Expected canonical MDString");
 401   DEFINE_GETIMPL_LOOKUP(MDObjCProperty,
 402                         (getString(Name), File, Line, getString(GetterName),
 403                          getString(SetterName), Attributes, Type));
 404   Metadata *Ops[] = {Name, File, GetterName, SetterName, Type};
 405   DEFINE_GETIMPL_STORE(MDObjCProperty, (Line, Attributes), Ops);
 406 }
 407
 408 MDImportedEntity *MDImportedEntity::getImpl(LLVMContext &Context, unsigned Tag,
 409                                             Metadata *Scope, Metadata *Entity,
 410                                             unsigned Line, MDString *Name,
 411                                             StorageType Storage,
 412                                             bool ShouldCreate) {
 413   assert(isCanonical(Name) && "Expected canonical MDString");
 414   DEFINE_GETIMPL_LOOKUP(MDImportedEntity,
 415                         (Tag, Scope, Entity, Line, getString(Name)));
 416   Metadata *Ops[] = {Scope, Entity, Name};
 417   DEFINE_GETIMPL_STORE(MDImportedEntity, (Tag, Line), Ops);
 418 }