| //===--- IRGenMangler.cpp - mangling of IRGen symbols ---------------------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "IRGenMangler.h" |
| #include "swift/AST/ExistentialLayout.h" |
| #include "swift/AST/IRGenOptions.h" |
| #include "swift/AST/ProtocolAssociations.h" |
| #include "swift/AST/ProtocolConformance.h" |
| #include "swift/Demangling/ManglingMacros.h" |
| #include "swift/Demangling/Demangle.h" |
| #include "swift/ABI/MetadataValues.h" |
| #include "swift/ClangImporter/ClangModule.h" |
| #include "llvm/Support/SaveAndRestore.h" |
| |
| using namespace swift; |
| using namespace irgen; |
| |
| const char *getManglingForWitness(swift::Demangle::ValueWitnessKind kind) { |
| switch (kind) { |
| #define VALUE_WITNESS(MANGLING, NAME) \ |
| case swift::Demangle::ValueWitnessKind::NAME: return #MANGLING; |
| #include "swift/Demangling/ValueWitnessMangling.def" |
| } |
| llvm_unreachable("not a function witness"); |
| } |
| |
| std::string IRGenMangler::mangleValueWitness(Type type, ValueWitness witness) { |
| beginMangling(); |
| appendType(type); |
| |
| const char *Code = nullptr; |
| switch (witness) { |
| #define GET_MANGLING(ID) \ |
| case ValueWitness::ID: Code = getManglingForWitness(swift::Demangle::ValueWitnessKind::ID); break; |
| GET_MANGLING(InitializeBufferWithCopyOfBuffer) \ |
| GET_MANGLING(Destroy) \ |
| GET_MANGLING(InitializeWithCopy) \ |
| GET_MANGLING(AssignWithCopy) \ |
| GET_MANGLING(InitializeWithTake) \ |
| GET_MANGLING(AssignWithTake) \ |
| GET_MANGLING(GetEnumTagSinglePayload) \ |
| GET_MANGLING(StoreEnumTagSinglePayload) \ |
| GET_MANGLING(GetEnumTag) \ |
| GET_MANGLING(DestructiveProjectEnumData) \ |
| GET_MANGLING(DestructiveInjectEnumTag) |
| #undef GET_MANGLING |
| case ValueWitness::Size: |
| case ValueWitness::Flags: |
| case ValueWitness::ExtraInhabitantCount: |
| case ValueWitness::Stride: |
| llvm_unreachable("not a function witness"); |
| } |
| appendOperator("w", Code); |
| return finalize(); |
| } |
| |
| std::string IRGenMangler::manglePartialApplyForwarder(StringRef FuncName) { |
| if (FuncName.empty()) { |
| beginMangling(); |
| } else { |
| if (FuncName.startswith(MANGLING_PREFIX_STR)) { |
| Buffer << FuncName; |
| } else { |
| beginMangling(); |
| appendIdentifier(FuncName); |
| } |
| } |
| appendOperator("TA"); |
| return finalize(); |
| } |
| |
| SymbolicMangling |
| IRGenMangler::withSymbolicReferences(IRGenModule &IGM, |
| llvm::function_ref<void ()> body) { |
| Mod = IGM.getSwiftModule(); |
| OptimizeProtocolNames = false; |
| |
| llvm::SaveAndRestore<bool> |
| AllowSymbolicReferencesLocally(AllowSymbolicReferences); |
| llvm::SaveAndRestore<std::function<bool (SymbolicReferent)>> |
| CanSymbolicReferenceLocally(CanSymbolicReference); |
| |
| AllowSymbolicReferences = true; |
| CanSymbolicReference = [&IGM](SymbolicReferent s) -> bool { |
| if (auto type = s.dyn_cast<const NominalTypeDecl *>()) { |
| // FIXME: Sometimes we fail to emit metadata for Clang imported types |
| // even after noting use of their type descriptor or metadata. Work |
| // around by not symbolic-referencing imported types for now. |
| if (type->hasClangNode()) |
| return false; |
| |
| // TODO: We ought to be able to use indirect symbolic references even |
| // when the referent may be in another file, once the on-disk |
| // ObjectMemoryReader can handle them. |
| // Private entities are known to be accessible. |
| if (type->getEffectiveAccess() >= AccessLevel::Internal && |
| (!IGM.CurSourceFile || |
| IGM.CurSourceFile != type->getParentSourceFile())) |
| return false; |
| |
| // @objc protocols don't have descriptors. |
| if (auto proto = dyn_cast<ProtocolDecl>(type)) |
| if (proto->isObjC()) |
| return false; |
| |
| return true; |
| } else { |
| llvm_unreachable("symbolic referent not handled"); |
| } |
| }; |
| |
| SymbolicReferences.clear(); |
| |
| body(); |
| |
| return {finalize(), std::move(SymbolicReferences)}; |
| } |
| |
| SymbolicMangling |
| IRGenMangler::mangleTypeForReflection(IRGenModule &IGM, |
| Type Ty) { |
| return withSymbolicReferences(IGM, [&]{ |
| appendType(Ty); |
| }); |
| } |
| |
| std::string IRGenMangler::mangleProtocolConformanceDescriptor( |
| const RootProtocolConformance *conformance) { |
| beginMangling(); |
| if (isa<NormalProtocolConformance>(conformance)) { |
| appendProtocolConformance(conformance); |
| appendOperator("Mc"); |
| } else { |
| auto protocol = cast<SelfProtocolConformance>(conformance)->getProtocol(); |
| appendProtocolName(protocol); |
| appendOperator("MS"); |
| } |
| return finalize(); |
| } |
| |
| SymbolicMangling |
| IRGenMangler::mangleProtocolConformanceForReflection(IRGenModule &IGM, |
| Type ty, ProtocolConformanceRef conformance) { |
| return withSymbolicReferences(IGM, [&]{ |
| if (conformance.isConcrete()) { |
| appendProtocolConformance(conformance.getConcrete()); |
| } else { |
| // Use a special mangling for abstract conformances. |
| appendType(ty); |
| appendProtocolName(conformance.getAbstract()); |
| } |
| }); |
| } |
| |
| std::string IRGenMangler::mangleTypeForLLVMTypeName(CanType Ty) { |
| // To make LLVM IR more readable we always add a 'T' prefix so that type names |
| // don't start with a digit and don't need to be quoted. |
| Buffer << 'T'; |
| if (auto P = dyn_cast<ProtocolType>(Ty)) { |
| appendProtocolName(P->getDecl(), /*allowStandardSubstitution=*/false); |
| appendOperator("P"); |
| } else { |
| appendType(Ty); |
| } |
| return finalize(); |
| } |
| |
| std::string IRGenMangler:: |
| mangleProtocolForLLVMTypeName(ProtocolCompositionType *type) { |
| ExistentialLayout layout = type->getExistentialLayout(); |
| |
| if (type->isAny()) { |
| Buffer << "Any"; |
| } else if (layout.isAnyObject()) { |
| Buffer << "AnyObject"; |
| } else { |
| // To make LLVM IR more readable we always add a 'T' prefix so that type names |
| // don't start with a digit and don't need to be quoted. |
| Buffer << 'T'; |
| auto protocols = layout.getProtocols(); |
| for (unsigned i = 0, e = protocols.size(); i != e; ++i) { |
| appendProtocolName(protocols[i]->getDecl()); |
| if (i == 0) |
| appendOperator("_"); |
| } |
| if (auto superclass = layout.explicitSuperclass) { |
| // We share type infos for different instantiations of a generic type |
| // when the archetypes have the same exemplars. We cannot mangle |
| // archetypes, and the mangling does not have to be unique, so we just |
| // mangle the unbound generic form of the type. |
| if (superclass->hasArchetype()) { |
| superclass = superclass->getClassOrBoundGenericClass() |
| ->getDeclaredType(); |
| } |
| |
| appendType(CanType(superclass)); |
| appendOperator("Xc"); |
| } else if (layout.getLayoutConstraint()) { |
| appendOperator("Xl"); |
| } else { |
| appendOperator("p"); |
| } |
| } |
| return finalize(); |
| } |
| |
| std::string IRGenMangler:: |
| mangleSymbolNameForSymbolicMangling(const SymbolicMangling &mangling, |
| MangledTypeRefRole role) { |
| beginManglingWithoutPrefix(); |
| const char *prefix; |
| switch (role) { |
| case MangledTypeRefRole::DefaultAssociatedTypeWitness: |
| prefix = "default assoc type "; |
| break; |
| |
| case MangledTypeRefRole::Metadata: |
| case MangledTypeRefRole::Reflection: |
| prefix = "symbolic "; |
| break; |
| } |
| auto prefixLen = strlen(prefix); |
| |
| Buffer << prefix << mangling.String; |
| |
| for (auto &symbol : mangling.SymbolicReferences) { |
| // Fill in the placeholder space with something printable. |
| auto referent = symbol.first; |
| auto offset = symbol.second; |
| Storage[prefixLen + offset] |
| = Storage[prefixLen + offset+1] |
| = Storage[prefixLen + offset+2] |
| = Storage[prefixLen + offset+3] |
| = Storage[prefixLen + offset+4] |
| = '_'; |
| Buffer << ' '; |
| if (auto ty = referent.dyn_cast<const NominalTypeDecl*>()) |
| appendContext(ty); |
| else |
| llvm_unreachable("unhandled referent"); |
| } |
| |
| return finalize(); |
| } |
| |
| std::string IRGenMangler::mangleSymbolNameForAssociatedConformanceWitness( |
| const NormalProtocolConformance *conformance, |
| CanType associatedType, |
| const ProtocolDecl *proto) { |
| beginManglingWithoutPrefix(); |
| if (conformance) { |
| Buffer << "associated conformance "; |
| appendProtocolConformance(conformance); |
| } else { |
| Buffer << "default associated conformance"; |
| } |
| |
| bool isFirstAssociatedTypeIdentifier = true; |
| appendAssociatedTypePath(associatedType, isFirstAssociatedTypeIdentifier); |
| appendProtocolName(proto); |
| return finalize(); |
| } |
| |
| std::string IRGenMangler::mangleSymbolNameForKeyPathMetadata( |
| const char *kind, |
| CanGenericSignature genericSig, |
| CanType type, |
| ProtocolConformanceRef conformance) { |
| beginManglingWithoutPrefix(); |
| Buffer << kind << " "; |
| |
| if (genericSig) |
| appendGenericSignature(genericSig); |
| |
| if (type) |
| appendType(type); |
| |
| if (conformance.isConcrete()) |
| appendConcreteProtocolConformance(conformance.getConcrete()); |
| else if (conformance.isAbstract()) |
| appendProtocolName(conformance.getAbstract()); |
| else |
| assert(conformance.isInvalid() && "Unknown protocol conformance"); |
| return finalize(); |
| } |
| |
| std::string IRGenMangler::mangleSymbolNameForGenericEnvironment( |
| CanGenericSignature genericSig) { |
| beginManglingWithoutPrefix(); |
| Buffer << "generic environment "; |
| appendGenericSignature(genericSig); |
| return finalize(); |
| } |