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82b5f2a195
Instead of re-typechecking parsed expression, find typechecked expression that corresponds to the parsed expression from the typechecked decl context, because the sub expressions of the parsed expression can be weirdly mutated/replaced by decl context typechecking. rdar://problem/48141174
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
//===--- ExprContextAnalysis.h - Expession context analysis ---------------===//
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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) 2019 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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#ifndef SWIFT_IDE_EXPRCONTEXTANALYSIS_H
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#define SWIFT_IDE_EXPRCONTEXTANALYSIS_H
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#include "swift/AST/Type.h"
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#include "swift/Basic/LLVM.h"
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#include "swift/Basic/SourceLoc.h"
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namespace swift {
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class DeclContext;
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class Expr;
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class ValueDecl;
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class AnyFunctionType;
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namespace ide {
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/// Prepare the given expression for type-checking again, prinicipally by
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/// erasing any ErrorType types on the given expression, allowing later
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/// type-checking to make progress.
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void prepareForRetypechecking(Expr *E);
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/// Type check parent contexts of the given decl context, and the body of the
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/// given context until \c Loc if the context is a function body.
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void typeCheckContextUntil(DeclContext *DC, SourceLoc Loc);
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/// From \p DC, find and returns the outer most expression which source range is
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/// exact the same as \p TargetRange. Returns \c nullptr if not found.
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Expr *findParsedExpr(const DeclContext *DC, SourceRange TargetRange);
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/// Returns expected return type of the given decl context.
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/// \p DC should be an \c AbstractFunctionDecl or an \c AbstractClosureExpr.
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Type getReturnTypeFromContext(const DeclContext *DC);
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using FunctionTypeAndDecl = std::pair<AnyFunctionType *, ValueDecl *>;
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/// Given an expression and its decl context, the analyzer tries to figure out
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/// the expected type of the expression by analyzing its context.
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class ExprContextInfo {
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SmallVector<Type, 2> PossibleTypes;
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SmallVector<StringRef, 2> PossibleNames;
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SmallVector<FunctionTypeAndDecl, 2> PossibleCallees;
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public:
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ExprContextInfo(DeclContext *DC, Expr *TargetExpr);
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// Returns a list of possible context types.
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ArrayRef<Type> getPossibleTypes() const { return PossibleTypes; }
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// Returns a list of possible argument label names.
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// Valid only if \c getKind() is \c CallArgument.
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ArrayRef<StringRef> getPossibleNames() const { return PossibleNames; }
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// Returns a list of possible callee
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// Valid only if \c getKind() is \c CallArgument.
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ArrayRef<FunctionTypeAndDecl> getPossibleCallees() const {
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return PossibleCallees;
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}
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};
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} // namespace ide
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} // namespace swift
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#endif // SWIFT_IDE_EXPRCONTEXTANALYSIS_H
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