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b5f36f7bea
We were unnecessarily conservative here; generic metadata patterns support indirectable references to value witness tables exported by the standard library, so if we have a fixed-layout generic type that matches a known value witness table layout, use that instead of generating a new value witness table.
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
//===--- GenValueWitness.h - Swift IRGen for value witnesses ----*- 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 value witness emission
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// code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_GENVALUEWITNESS_H
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#define SWIFT_IRGEN_GENVALUEWITNESS_H
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#include "swift/Basic/LLVM.h"
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namespace llvm {
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class Constant;
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class Type;
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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 ConstantStructBuilder;
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class IRGenModule;
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class ConstantReference;
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/// True if a type has a generic-parameter-dependent value witness table.
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/// Currently, this is true if the size and/or alignment of the type is
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/// dependent on its generic parameters.
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bool hasDependentValueWitnessTable(IRGenModule &IGM, CanType ty);
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/// Emit a value-witness table for the given type.
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///
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/// \param isPattern - true if the table just serves as an instantiation
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/// pattern and does not need to be modifiable in-place (if the type
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/// does not have static layout for some reason)
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ConstantReference emitValueWitnessTable(IRGenModule &IGM, CanType type,
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bool isPattern,
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bool relativeReference);
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}
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}
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#endif
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