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48d6a833a5
unconditional_dynamic_cast_addr instruction. Also, fix some major semantic problems with the existing specialization of unconditional dynamic casts by handling optional types and being much more conservative about deciding that a cast is infeasible. This commit regresses specialization slightly by failing to turn indirect dynamic casts into scalar ones when possible; we can fix that easily enough in a follow-up. Swift SVN r19044
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//===--- DynamicsCasts.h - SIL dynamic-cast utilities -----------*- 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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// This file provides basic utilities for working with subtyping
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// relationships.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SIL_SUBTYPING_H
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#define SWIFT_SIL_SUBTYPING_H
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namespace swift {
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class CanType;
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class Module;
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class SILBuilder;
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class SILLocation;
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class SILValue;
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class SILType;
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enum class CastConsumptionKind : unsigned char;
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enum class DynamicCastFeasibility {
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/// The cast will always succeed.
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WillSucceed,
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/// The cast can succeed for some values.
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MaySucceed,
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/// The cast cannot succeed.
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WillFail,
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};
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/// Classify the feasibility of a dynamic cast. The source and target
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/// types should be unlowered formal types.
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DynamicCastFeasibility classifyDynamicCast(Module *context,
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CanType sourceType,
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CanType targetType);
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SILValue emitSuccessfulScalarUnconditionalCast(SILBuilder &B, Module *M,
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SILLocation loc, SILValue value,
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SILType loweredTargetType,
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CanType formalSourceType,
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CanType formalTargetType);
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void emitSuccessfulIndirectUnconditionalCast(SILBuilder &B, Module *M,
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SILLocation loc,
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CastConsumptionKind consumption,
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SILValue src, CanType sourceType,
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SILValue dest, CanType targetType);
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} // end namespace swift
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#endif
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