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4ed09b4a73
It looks like the devirtualizer used to have problems computing method types in the presence of generic substitutions, covariant returns and other things, so it would bail if a perticular set of pre-conditions was not met on the types of original method call and the devirtualized method call. I don't think any of this is necessary anymore. If this patch introduces any regressions, we need to fix the root cause instead of re-introducing this logic.
61 lines
2.6 KiB
C++
61 lines
2.6 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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/// 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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typedef std::pair<ValueBase *, ApplySite> DevirtualizationResult;
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DevirtualizationResult tryDevirtualizeApply(ApplySite AI,
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ClassHierarchyAnalysis *CHA);
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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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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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DevirtualizationResult tryDevirtualizeClassMethod(FullApplySite AI,
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SILValue ClassInstance);
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DevirtualizationResult tryDevirtualizeWitnessMethod(ApplySite AI);
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}
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#endif
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