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524cfae1b2
* Dynamic Cast Rework: Runtime This is a completely refactored version of the core swift_dynamicCast runtime method. This fixes a number of bugs, especially in the handling of multiply-wrapped types such as Optional within Any. The result should be much closer to the behavior specified by `docs/DynamicCasting.md`. Most of the type-specific logic is simply copied over from the earlier implementation, but the overall structure has been changed to be uniformly recursive. In particular, this provides uniform handling of Optional, existentials, Any and other common "box" types along all paths. The consistent structure should also be easier to update in the future with new general types. Benchmarking does not show any noticable performance implications. **Temporarily**, the old implementation is still available. Setting the environment variable `SWIFT_OLD_DYNAMIC_CAST_RUNTIME` before launching a program will use the old runtime implementation. This is only to facilitate testing; once the new implementation is stable, I expect to completely remove the old implementation.
225 lines
9.2 KiB
C++
225 lines
9.2 KiB
C++
//===--- CompatibilityOverrides.def - Compatibility Overrides Database -*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines x-macros used for metaprogramming with the set of
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// compatibility override functions.
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//
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//===----------------------------------------------------------------------===//
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/// #define OVERRIDE(name, ret, attrs, namespace, typedArgs, namedArgs)
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/// Provides information about an overridable function.
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/// - name is the name of the function, without any leading swift_ or
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/// namespace.
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/// - ret is the return type of the function.
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/// - attrs is the attributes, if any, applied to the function definition.
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/// - namespace is the namespace, if any, the function is in, including a
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/// trailing ::
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/// - typedArgs is the argument list, including types, surrounded by
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/// parentheses
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/// - namedArgs is the list of argument names, with no types, surrounded by
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/// parentheses
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///
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/// The entries are organized by group. A user may define OVERRIDE to get all
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/// entries, or define one or more of OVERRIDE_METADATALOOKUP, OVERRIDE_CASTING,
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/// OVERRIDE_OBJC, OVERRIDE_FOREIGN, OVERRIDE_PROTOCOLCONFORMANCE,
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/// and OVERRIDE_KEYPATH to get only those entries.
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// NOTE: this file is used to build the definition of OverrideSection in
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// CompatibilityOverride.cpp, which is part of the ABI. Do not move or remove entries
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// in this file after ABI stability. Additional entries can be added to the end.
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#ifdef OVERRIDE
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# define OVERRIDE_METADATALOOKUP OVERRIDE
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# define OVERRIDE_CASTING OVERRIDE
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# define OVERRIDE_DYNAMICCASTING OVERRIDE
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# define OVERRIDE_OBJC OVERRIDE
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# define OVERRIDE_FOREIGN OVERRIDE
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# define OVERRIDE_PROTOCOLCONFORMANCE OVERRIDE
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# define OVERRIDE_KEYPATH OVERRIDE
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# define OVERRIDE_WITNESSTABLE OVERRIDE
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#else
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# ifndef OVERRIDE_METADATALOOKUP
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# define OVERRIDE_METADATALOOKUP(...)
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# endif
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# ifndef OVERRIDE_CASTING
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# define OVERRIDE_CASTING(...)
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# endif
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# ifndef OVERRIDE_DYNAMICCASTING
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# define OVERRIDE_DYNAMICCASTING(...)
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# endif
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# ifndef OVERRIDE_OBJC
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# define OVERRIDE_OBJC(...)
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# endif
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# ifndef OVERRIDE_FOREIGN
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# define OVERRIDE_FOREIGN(...)
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# endif
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# ifndef OVERRIDE_PROTOCOLCONFORMANCE
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# define OVERRIDE_PROTOCOLCONFORMANCE(...)
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# endif
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# ifndef OVERRIDE_KEYPATH
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# define OVERRIDE_KEYPATH(...)
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# endif
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# ifndef OVERRIDE_WITNESSTABLE
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# define OVERRIDE_WITNESSTABLE(...)
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# endif
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#endif
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OVERRIDE_DYNAMICCASTING(dynamicCast, bool, , , swift::,
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(OpaqueValue *dest, OpaqueValue *src,
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const Metadata *srcType,
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const Metadata *targetType,
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DynamicCastFlags flags),
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(dest, src, srcType, targetType, flags))
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OVERRIDE_CASTING(dynamicCastClass, const void *, , , swift::,
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(const void *object,
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const ClassMetadata *targetType),
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(object, targetType))
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OVERRIDE_CASTING(dynamicCastClassUnconditional, const void *, , , swift::,
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(const void *object,
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const ClassMetadata *targetType,
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const char *file, unsigned line, unsigned column),
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(object, targetType, file, line, column))
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OVERRIDE_CASTING(dynamicCastUnknownClass, const void *, , , swift::,
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(const void *object, const Metadata *targetType),
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(object, targetType))
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OVERRIDE_CASTING(dynamicCastUnknownClassUnconditional, const void *, , , swift::,
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(const void *object, const Metadata *targetType,
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const char *file, unsigned line, unsigned column),
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(object, targetType, file, line, column))
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OVERRIDE_CASTING(dynamicCastMetatype, const Metadata *, , , swift::,
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(const Metadata *sourceType,
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const Metadata *targetType),
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(sourceType, targetType))
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OVERRIDE_CASTING(dynamicCastMetatypeUnconditional, const Metadata *, , , swift::,
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(const Metadata *sourceType,
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const Metadata *targetType,
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const char *file, unsigned line, unsigned column),
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(sourceType, targetType, file, line, column))
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OVERRIDE_FOREIGN(dynamicCastForeignClassMetatype, const ClassMetadata *, , , swift::,
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(const ClassMetadata *sourceType,
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const ClassMetadata *targetType),
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(sourceType, targetType))
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OVERRIDE_FOREIGN(dynamicCastForeignClassMetatypeUnconditional,
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const ClassMetadata *, , , swift::,
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(const ClassMetadata *sourceType,
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const ClassMetadata *targetType,
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const char *file, unsigned line, unsigned column),
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(sourceType, targetType, file, line, column))
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OVERRIDE_PROTOCOLCONFORMANCE(conformsToProtocol, const WitnessTable *, , , swift::,
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(const Metadata * const type,
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const ProtocolDescriptor *protocol),
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(type, protocol))
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OVERRIDE_KEYPATH(getKeyPath, const HeapObject *, , , swift::,
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(const void *pattern, const void *arguments),
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(pattern, arguments))
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OVERRIDE_METADATALOOKUP(getTypeByMangledNode, TypeInfo, , SWIFT_CC(swift), swift::,
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(MetadataRequest request,
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Demangler &demangler,
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Demangle::NodePointer node,
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const void * const *arguments,
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SubstGenericParameterFn substGenericParam,
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SubstDependentWitnessTableFn substWitnessTable),
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(request, demangler, node, arguments, substGenericParam, substWitnessTable))
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OVERRIDE_METADATALOOKUP(getTypeByMangledName, TypeInfo, , SWIFT_CC(swift), swift::,
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(MetadataRequest request,
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StringRef typeName,
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const void * const *arguments,
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SubstGenericParameterFn substGenericParam,
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SubstDependentWitnessTableFn substWitnessTable),
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(request, typeName, arguments, substGenericParam, substWitnessTable))
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OVERRIDE_WITNESSTABLE(getAssociatedTypeWitnessSlow, MetadataResponse,
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SWIFT_RUNTIME_STDLIB_INTERNAL, SWIFT_CC(swift), swift::,
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(MetadataRequest request, WitnessTable *wtable,
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const Metadata *conformingType,
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const ProtocolRequirement *reqBase,
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const ProtocolRequirement *assocType),
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(request, wtable, conformingType, reqBase, assocType))
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OVERRIDE_WITNESSTABLE(getAssociatedConformanceWitnessSlow, const WitnessTable *,
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SWIFT_RUNTIME_STDLIB_INTERNAL, SWIFT_CC(swift), swift::,
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(WitnessTable *wtable, const Metadata *conformingType,
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const Metadata *assocType,
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const ProtocolRequirement *reqBase,
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const ProtocolRequirement *assocConformance),
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(wtable, conformingType, assocType, reqBase,
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assocConformance))
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#if SWIFT_OBJC_INTEROP
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OVERRIDE_OBJC(dynamicCastObjCClass, const void *, , , swift::,
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(const void *object,
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const ClassMetadata *targetType),
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(object, targetType))
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OVERRIDE_OBJC(dynamicCastObjCClassUnconditional, const void *, , , swift::,
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(const void *object,
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const ClassMetadata *targetType,
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const char *file, unsigned line, unsigned column),
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(object, targetType, file, line, column))
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OVERRIDE_OBJC(dynamicCastObjCClassMetatype, const ClassMetadata *, , , swift::,
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(const ClassMetadata *sourceType,
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const ClassMetadata *targetType),
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(sourceType, targetType))
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OVERRIDE_OBJC(dynamicCastObjCClassMetatypeUnconditional, const ClassMetadata *, , , swift::,
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(const ClassMetadata *sourceType, const ClassMetadata *targetType,
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const char *file, unsigned line, unsigned column),
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(sourceType, targetType, file, line, column))
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OVERRIDE_FOREIGN(dynamicCastForeignClass, const void *, , , swift::,
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(const void *object,
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const ForeignClassMetadata *targetType),
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(object, targetType))
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OVERRIDE_FOREIGN(dynamicCastForeignClassUnconditional, const void *, , , swift::,
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(const void *object, const ForeignClassMetadata *targetType,
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const char *file, unsigned line, unsigned column),
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(object, targetType, file, line, column))
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#endif
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#undef OVERRIDE
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#undef OVERRIDE_METADATALOOKUP
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#undef OVERRIDE_CASTING
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#undef OVERRIDE_DYNAMICCASTING
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#undef OVERRIDE_OBJC
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#undef OVERRIDE_FOREIGN
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#undef OVERRIDE_PROTOCOLCONFORMANCE
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#undef OVERRIDE_KEYPATH
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#undef OVERRIDE_WITNESSTABLE
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