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87 lines
3.6 KiB
C++
87 lines
3.6 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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/// A pair representing results of devirtualization.
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/// - The first element is the value representing the result of the
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/// devirtualized call.
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/// - The second element is the new apply/try_apply instruction.
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/// If no devirtualization was possible, the pair:
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/// <nullptr, FullApplySite()> is returned.
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///
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/// Two elements are required, because a result of the new devirtualized
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/// apply/try_apply instruction (second element) eventually needs to be
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/// casted to produce a properly typed value (first element).
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///
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/// *NOTE* The reason why we use a ValueBase here instead of a SILInstruction is
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/// that a devirtualization result may be a BB arg if there was a cast in
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/// between optional types.
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typedef std::pair<ValueBase *, ApplySite> DevirtualizationResult;
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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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SILType ClassType,
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SILModule &M,
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ClassHierarchyAnalysis::ClassList &Subs);
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DevirtualizationResult 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 isNominalTypeWithUnboundGenericParameters(SILType Ty, SILModule &M);
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bool canDevirtualizeClassMethod(FullApplySite AI, SILType ClassInstanceType,
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OptRemark::Emitter *ORE = nullptr);
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SILFunction *getTargetClassMethod(SILModule &M, SILType ClassOrMetatypeType,
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MethodInst *MI);
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DevirtualizationResult devirtualizeClassMethod(FullApplySite AI,
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SILValue ClassInstance,
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OptRemark::Emitter *ORE);
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DevirtualizationResult tryDevirtualizeClassMethod(FullApplySite AI,
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SILValue ClassInstance,
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OptRemark::Emitter *ORE);
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DevirtualizationResult
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tryDevirtualizeWitnessMethod(ApplySite AI, OptRemark::Emitter *ORE);
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}
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#endif
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