C++ Mangler::append方法代码示例

static std::string mangleConstant(NormalProtocolConformance *C) {
  using namespace Mangle;
  Mangler mangler;

  //   mangled-name ::= '_T' global
  //   global ::= 'WP' protocol-conformance
  mangler.append("_TWP");
  mangler.mangleProtocolConformance(C);
  return mangler.finalize();

}

static std::string mangleConstant(NormalProtocolConformance *C) {
  using namespace Mangle;
  Mangler mangler;

  //   mangled-name ::= '_T' global
  //   global ::= 'WP' protocol-conformance
  mangler.append("_TWP");
  mangler.mangleProtocolConformance(C);
  std::string Old = mangler.finalize();

  NewMangling::ASTMangler NewMangler;
  std::string New = NewMangler.mangleWitnessTable(C);

  return NewMangling::selectMangling(Old, New);
}

static std::string mangleConstant(SILDeclRef c, SILDeclRef::ManglingKind Kind) {
  using namespace Mangle;
  Mangler mangler;

  // Almost everything below gets one of the common prefixes:
  //   mangled-name ::= '_T' global     // Native symbol
  //   mangled-name ::= '_TTo' global   // ObjC interop thunk
  //   mangled-name ::= '_TTO' global   // Foreign function thunk
  //   mangled-name ::= '_TTd' global   // Direct
  StringRef introducer = "_T";
  switch (Kind) {
    case SILDeclRef::ManglingKind::Default:
      if (c.isForeign) {
        introducer = "_TTo";
      } else if (c.isDirectReference) {
        introducer = "_TTd";
      } else if (c.isForeignToNativeThunk()) {
        introducer = "_TTO";
      }
      break;
    case SILDeclRef::ManglingKind::VTableMethod:
      introducer = "_TTV";
      break;
    case SILDeclRef::ManglingKind::DynamicThunk:
      introducer = "_TTD";
      break;
  }
  
  // As a special case, Clang functions and globals don't get mangled at all.
  if (c.hasDecl()) {
    if (auto clangDecl = c.getDecl()->getClangDecl()) {
      if (!c.isForeignToNativeThunk() && !c.isNativeToForeignThunk()
          && !c.isCurried) {
        if (auto namedClangDecl = dyn_cast<clang::DeclaratorDecl>(clangDecl)) {
          if (auto asmLabel = namedClangDecl->getAttr<clang::AsmLabelAttr>()) {
            mangler.append('\01');
            mangler.append(asmLabel->getLabel());
          } else if (namedClangDecl->hasAttr<clang::OverloadableAttr>()) {
            std::string storage;
            llvm::raw_string_ostream SS(storage);
            // FIXME: When we can import C++, use Clang's mangler all the time.
            mangleClangDecl(SS, namedClangDecl,
                            c.getDecl()->getASTContext());
            mangler.append(SS.str());
          } else {
            mangler.append(namedClangDecl->getName());
          }
          return mangler.finalize();
        }
      }
    }
  }
  
  switch (c.kind) {
  //   entity ::= declaration                     // other declaration
  case SILDeclRef::Kind::Func:
    if (!c.hasDecl()) {
      mangler.append(introducer);
      mangler.mangleClosureEntity(c.getAbstractClosureExpr(),
                                  c.uncurryLevel);
      return mangler.finalize();
    }

    // As a special case, functions can have manually mangled names.
    // Use the SILGen name only for the original non-thunked, non-curried entry
    // point.
    if (auto NameA = c.getDecl()->getAttrs().getAttribute<SILGenNameAttr>())
      if (!c.isForeignToNativeThunk() && !c.isNativeToForeignThunk()
          && !c.isCurried) {
        mangler.append(NameA->Name);
        return mangler.finalize();
      }
      
    // Use a given cdecl name for native-to-foreign thunks.
    if (auto CDeclA = c.getDecl()->getAttrs().getAttribute<CDeclAttr>())
      if (c.isNativeToForeignThunk()) {
        mangler.append(CDeclA->Name);
        return mangler.finalize();
      }

    // Otherwise, fall through into the 'other decl' case.
    SWIFT_FALLTHROUGH;

  case SILDeclRef::Kind::EnumElement:
    mangler.append(introducer);
    mangler.mangleEntity(c.getDecl(), c.uncurryLevel);
    return mangler.finalize();

  //   entity ::= context 'D'                     // deallocating destructor
  case SILDeclRef::Kind::Deallocator:
    mangler.append(introducer);
    mangler.mangleDestructorEntity(cast<DestructorDecl>(c.getDecl()),
                                   /*isDeallocating*/ true);
    return mangler.finalize();

  //   entity ::= context 'd'                     // destroying destructor
  case SILDeclRef::Kind::Destroyer:
    mangler.append(introducer);
    mangler.mangleDestructorEntity(cast<DestructorDecl>(c.getDecl()),
                                   /*isDeallocating*/ false);
//.........这里部分代码省略.........

/// Mangle this entity into the given stream.
void LinkEntity::mangle(raw_ostream &buffer) const {
  // Almost everything below gets the common prefix:
  //   mangled-name ::= '_T' global
  Mangler mangler;
  switch (getKind()) {
  //   global ::= 'w' value-witness-kind type     // value witness
  case Kind::ValueWitness:
    mangler.append("_Tw");
    mangler.append(mangleValueWitness(getValueWitness()));
    mangler.mangleType(getType(), 0);
    return mangler.finalize(buffer);

  //   global ::= 'WV' type                       // value witness
  case Kind::ValueWitnessTable:
    mangler.append("_TWV");
    mangler.mangleType(getType(), 0);
    return mangler.finalize(buffer);

  //   global ::= 't' type
  // Abstract type manglings just follow <type>.
  case Kind::TypeMangling:
    mangler.mangleType(getType(), 0);
    return mangler.finalize(buffer);

  //   global ::= 'Ma' type               // type metadata access function
  case Kind::TypeMetadataAccessFunction:
    mangler.append("_TMa");
    mangler.mangleType(getType(), 0);
    return mangler.finalize(buffer);

  //   global ::= 'ML' type               // type metadata lazy cache variable
  case Kind::TypeMetadataLazyCacheVariable:
    mangler.append("_TML");
    mangler.mangleType(getType(), 0);
    return mangler.finalize(buffer);

  //   global ::= 'Mf' type                       // 'full' type metadata
  //   global ::= 'M' directness type             // type metadata
  //   global ::= 'MP' directness type            // type metadata pattern
  case Kind::TypeMetadata:
    switch (getMetadataAddress()) {
    case TypeMetadataAddress::FullMetadata:
      mangler.mangleTypeFullMetadataFull(getType());
      break;
    case TypeMetadataAddress::AddressPoint:
      mangler.mangleTypeMetadataFull(getType(), isMetadataPattern());
      break;
    }
    return mangler.finalize(buffer);

  //   global ::= 'M' directness type             // type metadata
  case Kind::ForeignTypeMetadataCandidate:
    mangler.mangleTypeMetadataFull(getType(), /*isPattern=*/false);
    return mangler.finalize(buffer);

  //   global ::= 'Mm' type                       // class metaclass
  case Kind::SwiftMetaclassStub:
    mangler.append("_TMm");
    mangler.mangleNominalType(cast<ClassDecl>(getDecl()),
                              Mangler::BindGenerics::None);
    return mangler.finalize(buffer);

  //   global ::= 'Mn' type                       // nominal type descriptor
  case Kind::NominalTypeDescriptor:
    mangler.append("_TMn");
    mangler.mangleNominalType(cast<NominalTypeDecl>(getDecl()),
                              Mangler::BindGenerics::None);
    return mangler.finalize(buffer);

  //   global ::= 'Mp' type                       // protocol descriptor
  case Kind::ProtocolDescriptor:
    mangler.append("_TMp");
    mangler.mangleProtocolName(cast<ProtocolDecl>(getDecl()));
    return mangler.finalize(buffer);

  //   global ::= 'Wo' entity
  case Kind::WitnessTableOffset:
     mangler.append("_TWo");

    // Witness table entries for constructors always refer to the allocating
    // constructor.
    if (auto ctor = dyn_cast<ConstructorDecl>(getDecl()))
      mangler.mangleConstructorEntity(ctor, /*isAllocating=*/true,
                                      getUncurryLevel());
    else
      mangler.mangleEntity(getDecl(), getUncurryLevel());
    return mangler.finalize(buffer);

  //   global ::= 'Wv' directness entity
  case Kind::FieldOffset:
    mangler.mangleFieldOffsetFull(getDecl(), isOffsetIndirect());
    return mangler.finalize(buffer);

  //   global ::= 'WP' protocol-conformance
  case Kind::DirectProtocolWitnessTable:
    mangler.append("_TWP");
    mangler.mangleProtocolConformance(getProtocolConformance());
    return mangler.finalize(buffer);

//.........这里部分代码省略.........