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b2ffac54d3
When the SelfMetadata in a witness thunk is the tuple type (repeat each Self),
we can fulfill the pack shape and type metadata for Pack{repeat each Self}
from tuple metadata.
The length is trivially projected; the type metadata pack is slightly more
involved, because tuple metadata stores a list of element/offset pairs, so
we must stack allocate a pack and fill it in.
86 lines
3.3 KiB
C++
86 lines
3.3 KiB
C++
//===--- GenTuple.h - Swift IR generation for tuples ------------*- 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 - 2017 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 provides the private interface to the tuple-emission code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_GENTUPLE_H
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#define SWIFT_IRGEN_GENTUPLE_H
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#include "swift/Basic/LLVM.h"
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namespace llvm {
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class Value;
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}
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namespace swift {
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class CanType;
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namespace irgen {
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class Address;
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class Explosion;
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class IRGenFunction;
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class Size;
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/// Project the address of a tuple element.
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Address projectTupleElementAddress(IRGenFunction &IGF,
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Address base,
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SILType tupleType,
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unsigned fieldNo);
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/// Project the address of a tuple element, given a dynamic index.
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Address projectTupleElementAddressByDynamicIndex(IRGenFunction &IGF,
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Address base,
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SILType tupleType,
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llvm::Value *index,
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SILType elementType);
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/// Project a tuple element rvalue from an already-exploded tuple rvalue.
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void projectTupleElementFromExplosion(IRGenFunction &IGF,
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SILType tupleType,
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Explosion &tuple,
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unsigned fieldNo,
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Explosion &out);
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/// Return the offset to the given tuple element, if it's fixed.
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///
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/// This API is used by RemoteAST.
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llvm::Optional<Size> getFixedTupleElementOffset(IRGenModule &IGM,
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SILType tupleType,
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unsigned fieldNo);
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/// Returns the index of the element in the llvm struct type which represents
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/// \p fieldNo in \p tupleType.
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///
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/// Returns None if the tuple element is an empty type and therefore has no
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/// corresponding element in the llvm type.
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llvm::Optional<unsigned> getPhysicalTupleElementStructIndex(IRGenModule &IGM,
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SILType tupleType,
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unsigned fieldNo);
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/// Emit a string encoding the labels in the given tuple type.
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llvm::Constant *getTupleLabelsString(IRGenModule &IGM,
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CanTupleType type);
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/// Load the NumElements of a tuple type metadata.
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llvm::Value *emitTupleTypeMetadataLength(IRGenFunction &IGF,
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llvm::Value *metadata);
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llvm::Value *emitTupleTypeMetadataElementType(IRGenFunction &IGF,
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llvm::Value *metadata,
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llvm::Value *index);
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} // end namespace irgen
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} // end namespace swift
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#endif
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