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112d1bd561
Where possible, pass around a ClassDecl or a CanType instead of a SILType that might wrap a metatype; the unwrapping logic was repeated in several places. Also add a FIXME for a bug I found by inspection.
123 lines
5.0 KiB
C++
123 lines
5.0 KiB
C++
//===--- Devirtualize.h - Helper for devirtualizing apply -------*- 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 contains helper functions that perform the work of devirtualizing a
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// given apply when possible.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SIL_DEVIRTUALIZE_H
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#define SWIFT_SIL_DEVIRTUALIZE_H
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#include "swift/AST/Decl.h"
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#include "swift/AST/Types.h"
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#include "swift/SIL/SILDeclRef.h"
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#include "swift/SIL/SILFunction.h"
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#include "swift/SIL/SILInstruction.h"
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#include "swift/SIL/SILModule.h"
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#include "swift/SIL/SILType.h"
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#include "swift/SIL/SILValue.h"
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#include "swift/SILOptimizer/Analysis/ClassHierarchyAnalysis.h"
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#include "swift/SILOptimizer/Utils/Local.h"
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#include "llvm/ADT/ArrayRef.h"
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namespace swift {
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namespace OptRemark {
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class Emitter;
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}
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/// Compute all subclasses of a given class.
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///
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/// \p CHA class hierarchy analysis
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/// \p CD class declaration
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/// \p ClassType type of the instance
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/// \p M SILModule
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/// \p Subs a container to be used for storing the set of subclasses
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void getAllSubclasses(ClassHierarchyAnalysis *CHA,
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ClassDecl *CD,
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CanType ClassType,
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SILModule &M,
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ClassHierarchyAnalysis::ClassList &Subs);
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/// Given an apply instruction of a protocol requirement and a witness method
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/// for the requirement, compute a substitution suitable for a direct call
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/// to the witness method.
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///
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/// \p Module SILModule
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/// \p AI ApplySite that applies a procotol method
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/// \p F SILFunction with convention @convention(witness_method)
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/// \p CRef a concrete ProtocolConformanceRef
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SubstitutionMap getWitnessMethodSubstitutions(SILModule &Module, ApplySite AI,
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SILFunction *F,
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ProtocolConformanceRef CRef);
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/// Attempt to devirtualize the given apply site. If this fails,
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/// the returned ApplySite will be null.
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///
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/// If this succeeds, the caller must call deleteDevirtualizedApply on
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/// the original apply site.
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ApplySite tryDevirtualizeApply(ApplySite AI,
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ClassHierarchyAnalysis *CHA,
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OptRemark::Emitter *ORE = nullptr);
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bool canDevirtualizeApply(FullApplySite AI, ClassHierarchyAnalysis *CHA);
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bool canDevirtualizeClassMethod(FullApplySite AI, ClassDecl *CD,
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OptRemark::Emitter *ORE = nullptr,
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bool isEffectivelyFinalMethod = false);
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SILFunction *getTargetClassMethod(SILModule &M, ClassDecl *CD,
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MethodInst *MI);
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CanType getSelfInstanceType(CanType ClassOrMetatypeType);
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/// Devirtualize the given apply site, which is known to be devirtualizable.
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///
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/// The caller must call deleteDevirtualizedApply on the original apply site.
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FullApplySite devirtualizeClassMethod(FullApplySite AI,
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SILValue ClassInstance,
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ClassDecl *CD,
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OptRemark::Emitter *ORE);
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/// Attempt to devirtualize the given apply site, which is known to be
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/// of a class method. If this fails, the returned FullApplySite will be null.
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///
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/// If this succeeds, the caller must call deleteDevirtualizedApply on
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/// the original apply site.
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FullApplySite
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tryDevirtualizeClassMethod(FullApplySite AI,
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SILValue ClassInstance,
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ClassDecl *CD,
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OptRemark::Emitter *ORE,
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bool isEffectivelyFinalMethod = false);
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/// Attempt to devirtualize the given apply site, which is known to be
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/// of a witness method. If this fails, the returned FullApplySite
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/// will be null.
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///
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/// If this succeeds, the caller must call deleteDevirtualizedApply on
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/// the original apply site.
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ApplySite tryDevirtualizeWitnessMethod(ApplySite AI, OptRemark::Emitter *ORE);
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/// Delete a successfully-devirtualized apply site. This must always be
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/// called after devirtualizing an apply; not only is it not semantically
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/// equivalent to leave the old apply in-place, but the SIL isn't necessary
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/// well-formed.
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///
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/// Devirtualization is responsible for replacing uses of the original
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/// apply site with uses of the new one. The only thing this does is delete
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/// the instruction and any now-trivially-dead operands; it is separated
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/// from the actual devirtualization step only to apply the caller to log
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/// information about the original apply site. This is probably not a
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/// good enough reason to complicate the API.
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void deleteDevirtualizedApply(ApplySite AI);
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} // end namespace swift
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#endif
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