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Full type metadata isn't necessary to calculate the runtime layout of a dependent struct or enum; we only need the non-function data from the value witness table (size, alignment, extra inhabitant count, and POD/BT/etc. flags). This can be generated more efficiently than the type metadata for many types--if we know a specific instantiation is fixed-layout, we can regenerate the layout information, or if we know the type has the same layout as another well-known type, we can get the layout from a common value witness table. This breaks a deadlock in most (but not all) cases where a value type is recursive using classes or fixed-layout indirected structs like UnsafePointer. rdar://problem/19898165 This time, factor out the ObjC-dependent parts of the tests so they only run with ObjC interop. Swift SVN r30266
96 lines
4.3 KiB
C++
96 lines
4.3 KiB
C++
//===--- Enum.h - Runtime declarations for enums ---------------*- 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 - 2015 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 http://swift.org/LICENSE.txt for license information
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// See http://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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// Swift runtime functions in support of enums.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_ENUM_H
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#define SWIFT_RUNTIME_ENUM_H
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namespace swift {
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struct OpaqueValue;
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struct ValueWitnessTable;
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struct Metadata;
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struct EnumMetadata;
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struct TypeLayout;
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/// \brief Initialize the value witness table for a generic, single-payload
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/// enum instance.
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///
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/// \param vwtable - pointer to the instantiated but uninitialized value
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/// witness table for the enum.
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/// \param payload - type metadata for the payload case of the enum.
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/// \param emptyCases - the number of empty cases in the enum.
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extern "C" void swift_initEnumValueWitnessTableSinglePayload(
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ValueWitnessTable *vwtable,
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const TypeLayout *payload,
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unsigned emptyCases);
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/// \brief Faster variant of the above which avoids digging into the enum type
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/// metadata when the caller already has the payload information handy.
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///
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/// \param value - pointer to the enum value.
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/// \param payload - type metadata for the payload case of the enum.
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/// \param emptyCases - the number of empty cases in the enum.
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///
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/// \returns -1 if the payload case is inhabited. If an empty case is inhabited,
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/// returns a value greater than or equal to zero and less than
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/// emptyCases.
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extern "C" int swift_getEnumCaseSinglePayload(const OpaqueValue *value,
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const Metadata *payload,
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unsigned emptyCases);
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/// \brief Store the tag value for the given case into a single-payload enum,
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/// whose associated payload (if any) has already been initialized.
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///
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/// \param value - pointer to the enum value. If the case being initialized is
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/// the payload case (-1), then the payload should be
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/// initialized.
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/// \param payload - type metadata for the payload case of the enum.
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/// \param whichCase - unique value identifying the case. -1 for the payload
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/// case, or a value greater than or equal to zero and less
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/// than emptyCases for an empty case.
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/// \param emptyCases - the number of empty cases in the enum.
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extern "C" void swift_storeEnumTagSinglePayload(OpaqueValue *value,
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const Metadata *payload,
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int whichCase,
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unsigned emptyCases);
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/// \brief Initialize the value witness table for a generic, multi-payload
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/// enum instance.
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extern "C" void swift_initEnumMetadataMultiPayload(ValueWitnessTable *vwtable,
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EnumMetadata *enumType,
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unsigned numPayloads,
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const TypeLayout * const *payloadTypes);
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/// \brief Return an integer value representing which case of a multi-payload
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/// enum is inhabited.
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///
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/// \param value - pointer to the enum value.
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/// \param enumType - type metadata for the enum.
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///
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/// \returns The index of the enum case.
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extern "C" unsigned swift_getEnumCaseMultiPayload(const OpaqueValue *value,
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const EnumMetadata *enumType);
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/// \brief Store the tag value for the given case into a multi-payload enum,
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/// whose associated payload (if any) has already been initialized.
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extern "C" void swift_storeEnumTagMultiPayload(OpaqueValue *value,
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const EnumMetadata *enumType,
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unsigned whichCase);
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}
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#endif
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