mirror of
https://github.com/apple/swift.git
synced 2026-06-20 15:42:51 +02:00
Slava Pestov
df633ffcbf
If there are no braces, the start and end location of the range is the same token. When performing a lookup at this token's location, don't consider it to be "inside" the braces. NFC for now, but this problem causes some tests to fail once we enable cycle diagnostics.
1199 lines
44 KiB
C++
1199 lines
44 KiB
C++
//===--- UnqualifiedLookup.cpp - Swift Name Lookup Routines ---------------===//
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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 - 2018 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 file implements the construction of an UnqualifiedLookup, which entails
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// performing the lookup.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/ASTScope.h"
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#include "swift/AST/ASTVisitor.h"
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#include "swift/AST/ClangModuleLoader.h"
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#include "swift/AST/DebuggerClient.h"
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#include "swift/AST/ExistentialLayout.h"
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#include "swift/AST/Initializer.h"
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#include "swift/AST/LazyResolver.h"
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#include "swift/AST/NameLookup.h"
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#include "swift/AST/NameLookupRequests.h"
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#include "swift/AST/ParameterList.h"
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#include "swift/AST/ReferencedNameTracker.h"
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#include "swift/Basic/STLExtras.h"
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#include "swift/Basic/SourceManager.h"
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#include "swift/Basic/Statistic.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/TinyPtrVector.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#define DEBUG_TYPE "namelookup"
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using namespace swift;
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using namespace swift::namelookup;
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/// Determine the local declaration visibility key for an \c ASTScope in which
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/// name lookup successfully resolved.
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static DeclVisibilityKind getLocalDeclVisibilityKind(const ASTScope *scope) {
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switch (scope->getKind()) {
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case ASTScopeKind::Preexpanded:
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case ASTScopeKind::SourceFile:
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case ASTScopeKind::TypeDecl:
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case ASTScopeKind::AbstractFunctionDecl:
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case ASTScopeKind::TypeOrExtensionBody:
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case ASTScopeKind::AbstractFunctionBody:
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case ASTScopeKind::DefaultArgument:
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case ASTScopeKind::PatternBinding:
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case ASTScopeKind::IfStmt:
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case ASTScopeKind::GuardStmt:
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case ASTScopeKind::RepeatWhileStmt:
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case ASTScopeKind::ForEachStmt:
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case ASTScopeKind::DoCatchStmt:
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case ASTScopeKind::SwitchStmt:
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case ASTScopeKind::Accessors:
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case ASTScopeKind::TopLevelCode:
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llvm_unreachable("no local declarations?");
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case ASTScopeKind::ExtensionGenericParams:
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case ASTScopeKind::GenericParams:
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return DeclVisibilityKind::GenericParameter;
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case ASTScopeKind::AbstractFunctionParams:
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case ASTScopeKind::Closure:
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case ASTScopeKind::PatternInitializer: // lazy var 'self'
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return DeclVisibilityKind::FunctionParameter;
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case ASTScopeKind::AfterPatternBinding:
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case ASTScopeKind::ConditionalClause:
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case ASTScopeKind::ForEachPattern:
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case ASTScopeKind::BraceStmt:
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case ASTScopeKind::CatchStmt:
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case ASTScopeKind::CaseStmt:
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return DeclVisibilityKind::LocalVariable;
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}
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llvm_unreachable("Unhandled ASTScopeKind in switch.");
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}
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namespace {
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/// Determine whether unqualified lookup should look at the members of the
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/// given nominal type or extension, vs. only looking at type parameters.
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template <typename D> bool shouldLookupMembers(D *decl, SourceLoc loc) {
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// Only look at members of this type (or its inherited types) when
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// inside the body or a protocol's top-level 'where' clause. (Why the
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// 'where' clause? Because that's where you put constraints on
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// inherited associated types.)
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// When we have no source-location information, we have to perform member
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// lookup.
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if (loc.isInvalid() || decl->getBraces().isInvalid())
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return true;
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// Within the braces, always look for members.
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auto &ctx = decl->getASTContext();
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auto braces = decl->getBraces();
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if (braces.Start != braces.End &&
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ctx.SourceMgr.rangeContainsTokenLoc(braces, loc))
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return true;
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// Within 'where' clause, we can also look for members.
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if (auto *whereClause = decl->getTrailingWhereClause()) {
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SourceRange whereClauseRange = whereClause->getSourceRange();
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if (whereClauseRange.isValid() &&
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ctx.SourceMgr.rangeContainsTokenLoc(whereClauseRange, loc)) {
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return true;
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}
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}
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// Don't look at the members.
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return false;
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}
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} // end anonymous namespace
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namespace {
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/// Because UnqualifiedLookup does all of its work in the constructor,
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/// a factory class is needed to hold all of the inputs and outputs so
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/// that the construction code can be decomposed into bite-sized pieces.
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class UnqualifiedLookupFactory {
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public:
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using Flags = UnqualifiedLookup::Flags;
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using Options = UnqualifiedLookup::Options;
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private:
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struct ContextAndResolvedIsCascadingUse {
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DeclContext *const DC;
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const bool isCascadingUse;
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};
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/// Finds lookup results based on the types that self conforms to.
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/// For instance, self always conforms to a struct, enum or class.
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/// But in addition, self could conform to any number of protocols.
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/// For example, when there's a protocol extension, e.g. extension P where
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/// self: P2, self also conforms to P2 so P2 must be searched.
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class ResultFinderForTypeContext {
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/// Nontypes are formally members of the base type, i.e. the dynamic type
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/// of the activation record.
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DeclContext *const dynamicContext;
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/// Types are formally members of the metatype, i.e. the static type of the
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/// activation record.
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DeclContext *const staticContext;
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using SelfBounds = SmallVector<NominalTypeDecl *, 2>;
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SelfBounds selfBounds;
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public:
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/// \p staticContext is also the context from which to derive the self types
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ResultFinderForTypeContext(DeclContext *dynamicContext,
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DeclContext *staticContext);
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void dump() const;
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private:
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SelfBounds findSelfBounds(DeclContext *dc);
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// Classify this declaration.
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// Types are formally members of the metatype.
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DeclContext *whereValueIsMember(const ValueDecl *const member) const {
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return isa<TypeDecl>(member) ? staticContext : dynamicContext;
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}
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public:
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/// Do the lookups and add matches to results.
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void findResults(const DeclName &Name, bool isCascadingUse,
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NLOptions baseNLOptions, DeclContext *contextForLookup,
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SmallVectorImpl<LookupResultEntry> &results) const;
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};
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enum class AddGenericParameters { Yes, No };
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// Inputs
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const DeclName Name;
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DeclContext *const DC;
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ModuleDecl &M;
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const ASTContext &Ctx;
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LazyResolver *const TypeResolver;
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const SourceLoc Loc;
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const SourceManager &SM;
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/// Used to find the file-local names.
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DebuggerClient *const DebugClient;
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const Options options;
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const bool isOriginallyTypeLookup;
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const NLOptions baseNLOptions;
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// Transputs
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NamedDeclConsumer Consumer;
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// Outputs
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SmallVectorImpl<LookupResultEntry> &Results;
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size_t &IndexOfFirstOuterResult;
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SmallVector<LookupResultEntry, 4> UnavailableInnerResults;
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public: // for exp debugging
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SourceFile const *recordedSF = nullptr;
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DeclName recordedName;
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bool recordedIsCascadingUse = false;
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public:
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// clang-format off
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UnqualifiedLookupFactory(DeclName Name,
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DeclContext *const DC,
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LazyResolver *TypeResolver,
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SourceLoc Loc,
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Options options,
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UnqualifiedLookup &lookupToBeCreated);
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// clang-format on
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void performUnqualifiedLookup();
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private:
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struct ContextAndUnresolvedIsCascadingUse {
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DeclContext *whereToLook;
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Optional<bool> isCascadingUse;
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ContextAndResolvedIsCascadingUse resolve(const bool resolution) const {
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return ContextAndResolvedIsCascadingUse{
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whereToLook, isCascadingUse.getValueOr(resolution)};
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}
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};
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bool useASTScopesForExperimentalLookup() const;
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void lookUpTopLevelNamesInModuleScopeContext(DeclContext *);
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#pragma mark ASTScope-based-lookup declarations
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void experimentallyLookInASTScopes(ContextAndUnresolvedIsCascadingUse);
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std::pair<const ASTScope *, bool>
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operatorScopeForASTScopeLookup(ContextAndUnresolvedIsCascadingUse);
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std::pair<const ASTScope *, Optional<bool>> nonoperatorScopeForASTScopeLookup(
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ContextAndUnresolvedIsCascadingUse) const;
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struct ASTScopeLookupState {
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const ASTScope *scope;
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DeclContext *selfDC;
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DeclContext *dc;
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Optional<bool> isCascadingUse;
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ASTScopeLookupState withParentScope() const {
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return ASTScopeLookupState{scope->getParent(), selfDC, dc, isCascadingUse};
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}
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ASTScopeLookupState withNoScope() const {
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return ASTScopeLookupState{nullptr, selfDC, dc, isCascadingUse};
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}
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ASTScopeLookupState withSelfDC(DeclContext *selfDC) const {
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return ASTScopeLookupState{scope, selfDC, dc, isCascadingUse};
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}
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ASTScopeLookupState withDC(DeclContext *dc) const {
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return ASTScopeLookupState{scope, selfDC, dc, isCascadingUse};
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}
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ASTScopeLookupState withResolvedIsCascadingUse(bool isCascadingUse) const {
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return ASTScopeLookupState{scope, selfDC, dc, isCascadingUse};
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}
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};
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void lookInScopeForASTScopeLookup(const ASTScopeLookupState);
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void lookIntoDeclarationContextForASTScopeLookup(ASTScopeLookupState);
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/// Can lookup stop searching for results, assuming hasn't looked for outer
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/// results yet?
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bool isFirstResultEnough() const;
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/// Every time lookup finishes searching a scope, call me
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/// to record the dividing line between results from first fruitful scope and
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/// the result.
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void recordCompletionOfAScope();
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template <typename Fn> void ifNotDoneYet(Fn fn) {
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recordCompletionOfAScope();
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if (!isFirstResultEnough())
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fn();
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}
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template <typename Fn1, typename Fn2> void ifNotDoneYet(Fn1 fn1, Fn2 fn2) {
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ifNotDoneYet(fn1);
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ifNotDoneYet(fn2);
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}
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#pragma mark normal (non-ASTScope-based) lookup declarations
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void lookupOperatorInDeclContexts(ContextAndUnresolvedIsCascadingUse);
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void lookupNamesIntroducedBy(const ContextAndUnresolvedIsCascadingUse);
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void finishLookingInContext(
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AddGenericParameters addGenericParameters,
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DeclContext *lookupContextForThisContext,
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Optional<ResultFinderForTypeContext> &&resultFinderForTypeContext,
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Optional<bool> isCascadingUse);
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void lookupInModuleScopeContext(DeclContext *, Optional<bool> isCascadingUse);
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// TODO: use objects & virtuals?
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void lookupNamesIntroducedByPatternBindingInitializer(
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PatternBindingInitializer *PBI, Optional<bool> isCascadingUse);
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void
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lookupNamesIntroducedByLazyVariableInitializer(PatternBindingInitializer *PBI,
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ParamDecl *selfParam,
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Optional<bool> isCascadingUse);
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void lookupNamesIntroducedByInitializerOfStoredPropertyOfAType(
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PatternBindingInitializer *PBI, Optional<bool> isCascadingUse);
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/// An initializer of a global name, or a function-likelocal name.
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void lookupNamesIntroducedByInitializerOfGlobalOrLocal(
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PatternBindingInitializer *PBI, Optional<bool> isCascadingUse);
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void lookupNamesIntroducedByFunctionDecl(AbstractFunctionDecl *AFD,
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Optional<bool> isCascadingUse);
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void lookupNamesIntroducedByMemberFunction(AbstractFunctionDecl *AFD,
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bool isCascadingUse);
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void lookupNamesIntroducedByPureFunction(AbstractFunctionDecl *AFD,
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bool isCascadingUse);
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void lookupNamesIntroducedByClosure(AbstractClosureExpr *ACE,
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Optional<bool> isCascadingUse);
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template <typename NominalTypeDeclOrExtensionDecl>
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void lookupNamesIntroducedByNominalTypeOrExtension(
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NominalTypeDeclOrExtensionDecl *D, Optional<bool> isCascadingUse);
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void lookupNamesIntroducedByDefaultArgumentInitializer(
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DefaultArgumentInitializer *I, Optional<bool> isCascadingUse);
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void lookupNamesIntroducedByMiscContext(DeclContext *dc,
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Optional<bool> isCascadingUse);
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void lookForLocalVariablesIn(AbstractFunctionDecl *AFD,
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Optional<bool> isCascadingUse);
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void lookForLocalVariablesIn(ClosureExpr *);
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void lookForLocalVariablesIn(SourceFile *);
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bool isOutsideBodyOfFunction(const AbstractFunctionDecl *const AFD) const;
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void addGenericParametersHereAndInEnclosingScopes(DeclContext *dc);
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void addGenericParametersHereAndInEnclosingScopes(GenericParamList *);
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/// Consume generic parameters
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void addGenericParametersForFunction(AbstractFunctionDecl *AFD);
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static GenericParamList *getGenericParams(const DeclContext *const dc);
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/// For diagnostic purposes, move aside the unavailables, and put
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/// them back as a last-ditch effort.
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/// Could be cleaner someday with a richer interface to UnqualifiedLookup.
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void setAsideUnavailableResults(size_t firstPossiblyUnavailableResult);
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void recordDependencyOnTopLevelName(DeclContext *topLevelContext,
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DeclName name, bool isCascadingUse);
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void addImportedResults(DeclContext *const dc);
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void addNamesKnownToDebugClient(DeclContext *dc);
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void addUnavailableInnerResults();
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void lookForAModuleWithTheGivenName(DeclContext *const dc);
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#pragma mark common helper declarations
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static NLOptions
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computeBaseNLOptions(const UnqualifiedLookup::Options options,
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const bool isOriginallyTypeLookup);
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static bool resolveIsCascadingUse(const DeclContext *const dc,
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Optional<bool> isCascadingUse,
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bool onlyCareAboutFunctionBody);
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static bool resolveIsCascadingUse(ContextAndUnresolvedIsCascadingUse x,
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bool onlyCareAboutFunctionBody) {
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return resolveIsCascadingUse(x.whereToLook, x.isCascadingUse,
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onlyCareAboutFunctionBody);
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}
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void findResultsAndSaveUnavailables(
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ResultFinderForTypeContext &&resultFinderForTypeContext,
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bool isCascadingUse, NLOptions baseNLOptions,
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DeclContext *lookupContextForThisContext);
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void dumpBreadcrumbs() const;
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};
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} // namespace
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#pragma mark UnqualifiedLookupFactory functions
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// clang-format off
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UnqualifiedLookupFactory::UnqualifiedLookupFactory(
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DeclName Name,
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DeclContext *const DC,
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LazyResolver *TypeResolver,
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SourceLoc Loc,
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Options options,
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UnqualifiedLookup &lookupToBeCreated)
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:
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Name(Name),
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DC(DC),
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M(*DC->getParentModule()),
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Ctx(M.getASTContext()),
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TypeResolver(TypeResolver ? TypeResolver : Ctx.getLazyResolver()),
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Loc(Loc),
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SM(Ctx.SourceMgr),
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DebugClient(M.getDebugClient()),
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options(options),
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isOriginallyTypeLookup(options.contains(Flags::TypeLookup)),
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baseNLOptions(computeBaseNLOptions(options, isOriginallyTypeLookup)),
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Consumer(Name, lookupToBeCreated.Results, isOriginallyTypeLookup),
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Results(lookupToBeCreated.Results),
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IndexOfFirstOuterResult(lookupToBeCreated.IndexOfFirstOuterResult)
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{}
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// clang-format on
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void UnqualifiedLookupFactory::performUnqualifiedLookup() {
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const Optional<bool> isCascadingUseInitial =
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options.contains(Flags::KnownPrivate) ? Optional<bool>(false) : None;
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ContextAndUnresolvedIsCascadingUse contextAndIsCascadingUse{
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DC, isCascadingUseInitial};
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if (useASTScopesForExperimentalLookup())
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experimentallyLookInASTScopes(contextAndIsCascadingUse);
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else if (Name.isOperator())
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lookupOperatorInDeclContexts(contextAndIsCascadingUse);
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else
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lookupNamesIntroducedBy(contextAndIsCascadingUse);
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}
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void UnqualifiedLookupFactory::lookUpTopLevelNamesInModuleScopeContext(
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DeclContext *DC) {
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// TODO: Does the debugger client care about compound names?
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if (Name.isSimpleName() && DebugClient &&
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DebugClient->lookupOverrides(Name.getBaseName(), DC, Loc,
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isOriginallyTypeLookup, Results))
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return;
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addImportedResults(DC);
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addNamesKnownToDebugClient(DC);
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if (Results.empty()) {
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// If we still haven't found anything, but we do have some
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// declarations that are "unavailable in the current Swift", drop
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// those in.
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addUnavailableInnerResults();
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if (Results.empty())
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lookForAModuleWithTheGivenName(DC);
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}
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recordCompletionOfAScope();
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}
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bool UnqualifiedLookupFactory::useASTScopesForExperimentalLookup() const {
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return Loc.isValid() && DC->getParentSourceFile() &&
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DC->getParentSourceFile()->Kind != SourceFileKind::REPL &&
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Ctx.LangOpts.EnableASTScopeLookup;
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}
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#pragma mark ASTScope-based-lookup definitions
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void UnqualifiedLookupFactory::experimentallyLookInASTScopes(
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const ContextAndUnresolvedIsCascadingUse contextAndIsCascadingUseArg) {
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const std::pair<const ASTScope *, Optional<bool>>
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lookupScopeAndIsCascadingUse =
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Name.isOperator()
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? operatorScopeForASTScopeLookup(contextAndIsCascadingUseArg)
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: nonoperatorScopeForASTScopeLookup(contextAndIsCascadingUseArg);
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// Walk scopes outward from the innermost scope until we find something.
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ASTScopeLookupState state{lookupScopeAndIsCascadingUse.first, nullptr,
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contextAndIsCascadingUseArg.whereToLook,
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lookupScopeAndIsCascadingUse.second};
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lookInScopeForASTScopeLookup(state);
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}
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std::pair<const ASTScope *, bool>
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UnqualifiedLookupFactory::operatorScopeForASTScopeLookup(
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const ContextAndUnresolvedIsCascadingUse contextAndIsCascadingUseArg) {
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// Find the source file in which we are performing the lookup.
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SourceFile &sourceFile =
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*contextAndIsCascadingUseArg.whereToLook->getParentSourceFile();
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// Find the scope from which we will initiate unqualified name lookup.
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const ASTScope *lookupScope =
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sourceFile.getScope().findInnermostEnclosingScope(Loc);
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// Operator lookup is always at module scope.
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return std::make_pair(
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&sourceFile.getScope(),
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resolveIsCascadingUse(lookupScope->getInnermostEnclosingDeclContext(),
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contextAndIsCascadingUseArg.isCascadingUse,
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/*onlyCareAboutFunctionBody*/ true));
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}
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std::pair<const ASTScope *, Optional<bool>>
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UnqualifiedLookupFactory::nonoperatorScopeForASTScopeLookup(
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const ContextAndUnresolvedIsCascadingUse contextAndIsCascadingUseArg)
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const {
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// Find the source file in which we are performing the lookup.
|
|
SourceFile &sourceFile =
|
|
*contextAndIsCascadingUseArg.whereToLook->getParentSourceFile();
|
|
|
|
// Find the scope from which we will initiate unqualified name lookup.
|
|
const ASTScope *lookupScope =
|
|
sourceFile.getScope().findInnermostEnclosingScope(Loc);
|
|
|
|
return std::make_pair(lookupScope,
|
|
contextAndIsCascadingUseArg.isCascadingUse);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookInScopeForASTScopeLookup(
|
|
const ASTScopeLookupState state) {
|
|
|
|
// Perform local lookup within this scope.
|
|
auto localBindings = state.scope->getLocalBindings();
|
|
for (auto local : localBindings) {
|
|
Consumer.foundDecl(local, getLocalDeclVisibilityKind(state.scope));
|
|
}
|
|
ifNotDoneYet([&] {
|
|
// When we are in the body of a method, get the 'self' declaration.
|
|
const bool inBody =
|
|
state.scope->getKind() == ASTScopeKind::AbstractFunctionBody &&
|
|
state.scope->getAbstractFunctionDecl()
|
|
->getDeclContext()
|
|
->isTypeContext();
|
|
if (inBody)
|
|
lookInScopeForASTScopeLookup(
|
|
state.withSelfDC(state.scope->getAbstractFunctionDecl())
|
|
.withParentScope());
|
|
// If there is a declaration context associated with this scope, we might
|
|
// want to look in it.
|
|
else
|
|
lookIntoDeclarationContextForASTScopeLookup(state);
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookIntoDeclarationContextForASTScopeLookup(
|
|
ASTScopeLookupState stateArg) {
|
|
|
|
DeclContext *scopeDC = stateArg.scope->getDeclContext();
|
|
if (!scopeDC) {
|
|
lookInScopeForASTScopeLookup(stateArg.withParentScope());
|
|
return;
|
|
}
|
|
|
|
// If we haven't determined whether we have a cascading use, do so now.
|
|
const bool isCascadingUseResult = resolveIsCascadingUse(
|
|
scopeDC, stateArg.isCascadingUse, /*onlyCareAboutFunctionBody=*/false);
|
|
|
|
const ASTScopeLookupState defaultNextState =
|
|
stateArg.withResolvedIsCascadingUse(isCascadingUseResult)
|
|
.withParentScope();
|
|
|
|
// Pattern binding initializers are only interesting insofar as they
|
|
// affect lookup in an enclosing nominal type or extension thereof.
|
|
if (auto *bindingInit = dyn_cast<PatternBindingInitializer>(scopeDC)) {
|
|
// Lazy variable initializer contexts have a 'self' parameter for
|
|
// instance member lookup.
|
|
lookInScopeForASTScopeLookup(bindingInit->getImplicitSelfDecl()
|
|
? defaultNextState.withSelfDC(bindingInit)
|
|
: defaultNextState);
|
|
return;
|
|
}
|
|
|
|
// Default arguments only have 'static' access to the members of the
|
|
// enclosing type, if there is one.
|
|
if (isa<DefaultArgumentInitializer>(scopeDC)) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Functions/initializers/deinitializers are only interesting insofar as
|
|
// they affect lookup in an enclosing nominal type or extension thereof.
|
|
if (isa<AbstractFunctionDecl>(scopeDC)) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Subscripts have no lookup of their own.
|
|
if (isa<SubscriptDecl>(scopeDC)) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Closures have no lookup of their own.
|
|
if (isa<AbstractClosureExpr>(scopeDC)) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Top-level declarations have no lookup of their own.
|
|
if (isa<TopLevelCodeDecl>(scopeDC)) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Typealiases have no lookup of their own.
|
|
if (isa<TypeAliasDecl>(scopeDC)) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Lookup in the source file's scope marks the end.
|
|
if (isa<SourceFile>(scopeDC)) {
|
|
recordDependencyOnTopLevelName(scopeDC, Name, isCascadingUseResult);
|
|
lookUpTopLevelNamesInModuleScopeContext(scopeDC);
|
|
return;
|
|
}
|
|
|
|
// We have a nominal type or an extension thereof. Perform lookup into
|
|
// the nominal type.
|
|
auto nominal = scopeDC->getSelfNominalTypeDecl();
|
|
if (!nominal) {
|
|
lookInScopeForASTScopeLookup(defaultNextState);
|
|
return;
|
|
}
|
|
// Dig out the type we're looking into.
|
|
// Perform lookup into the type
|
|
findResultsAndSaveUnavailables(
|
|
ResultFinderForTypeContext(
|
|
defaultNextState.selfDC ? defaultNextState.selfDC : scopeDC, scopeDC),
|
|
isCascadingUseResult, baseNLOptions, scopeDC);
|
|
// Forget the 'self' declaration.
|
|
ifNotDoneYet([&] {
|
|
lookInScopeForASTScopeLookup(defaultNextState.withSelfDC(nullptr));
|
|
});
|
|
}
|
|
|
|
#pragma mark context-based lookup definitions
|
|
|
|
void UnqualifiedLookupFactory::lookupOperatorInDeclContexts(
|
|
const ContextAndUnresolvedIsCascadingUse contextAndUseArg) {
|
|
ContextAndResolvedIsCascadingUse contextAndResolvedIsCascadingUse{
|
|
// Operators are global
|
|
contextAndUseArg.whereToLook->getModuleScopeContext(),
|
|
resolveIsCascadingUse(contextAndUseArg,
|
|
/*onlyCareAboutFunctionBody*/ true)};
|
|
lookupInModuleScopeContext(contextAndResolvedIsCascadingUse.DC,
|
|
contextAndResolvedIsCascadingUse.isCascadingUse);
|
|
}
|
|
|
|
// TODO: Unify with LookupVisibleDecls.cpp::lookupVisibleDeclsImpl
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedBy(
|
|
const ContextAndUnresolvedIsCascadingUse contextAndIsCascadingUseArg) {
|
|
|
|
DeclContext *const dc = contextAndIsCascadingUseArg.whereToLook;
|
|
const auto isCascadingUseSoFar = contextAndIsCascadingUseArg.isCascadingUse;
|
|
if (dc->isModuleScopeContext())
|
|
lookupInModuleScopeContext(dc, isCascadingUseSoFar);
|
|
else if (auto *PBI = dyn_cast<PatternBindingInitializer>(dc))
|
|
lookupNamesIntroducedByPatternBindingInitializer(PBI, isCascadingUseSoFar);
|
|
else if (auto *AFD = dyn_cast<AbstractFunctionDecl>(dc))
|
|
lookupNamesIntroducedByFunctionDecl(AFD, isCascadingUseSoFar);
|
|
else if (auto *ACE = dyn_cast<AbstractClosureExpr>(dc))
|
|
lookupNamesIntroducedByClosure(ACE, isCascadingUseSoFar);
|
|
else if (auto *ED = dyn_cast<ExtensionDecl>(dc))
|
|
lookupNamesIntroducedByNominalTypeOrExtension(ED, isCascadingUseSoFar);
|
|
else if (auto *ND = dyn_cast<NominalTypeDecl>(dc))
|
|
lookupNamesIntroducedByNominalTypeOrExtension(ND, isCascadingUseSoFar);
|
|
else if (auto I = dyn_cast<DefaultArgumentInitializer>(dc))
|
|
lookupNamesIntroducedByDefaultArgumentInitializer(I, isCascadingUseSoFar);
|
|
else
|
|
lookupNamesIntroducedByMiscContext(dc, isCascadingUseSoFar);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::finishLookingInContext(
|
|
const AddGenericParameters addGenericParameters,
|
|
DeclContext *const lookupContextForThisContext,
|
|
Optional<ResultFinderForTypeContext> &&resultFinderForTypeContext,
|
|
const Optional<bool> isCascadingUse) {
|
|
|
|
// When a generic has the same name as a member, Swift prioritizes the generic
|
|
// because the member could still be named by qualifying it. But there is no
|
|
// corresponding way to qualify a generic parameter.
|
|
// So, look for generics first.
|
|
if (addGenericParameters == AddGenericParameters::Yes)
|
|
addGenericParametersHereAndInEnclosingScopes(lookupContextForThisContext);
|
|
|
|
ifNotDoneYet(
|
|
[&] {
|
|
if (resultFinderForTypeContext)
|
|
findResultsAndSaveUnavailables(std::move(*resultFinderForTypeContext),
|
|
*isCascadingUse, baseNLOptions,
|
|
lookupContextForThisContext);
|
|
},
|
|
// Recurse into the next context.
|
|
[&] {
|
|
lookupNamesIntroducedBy(ContextAndUnresolvedIsCascadingUse{
|
|
lookupContextForThisContext->getParentForLookup(), isCascadingUse});
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::findResultsAndSaveUnavailables(
|
|
ResultFinderForTypeContext &&resultFinderForTypeContext,
|
|
bool isCascadingUse, NLOptions baseNLOptions,
|
|
DeclContext *lookupContextForThisContext) {
|
|
auto firstPossiblyUnavailableResult = Results.size();
|
|
resultFinderForTypeContext.findResults(Name, isCascadingUse, baseNLOptions,
|
|
lookupContextForThisContext, Results);
|
|
setAsideUnavailableResults(firstPossiblyUnavailableResult);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupInModuleScopeContext(
|
|
DeclContext *dc, Optional<bool> isCascadingUse) {
|
|
if (auto SF = dyn_cast<SourceFile>(dc))
|
|
lookForLocalVariablesIn(SF);
|
|
ifNotDoneYet([&] {
|
|
// If no result has been found yet, the dependency must be on a top-level
|
|
// name, since up to now, the search has been for non-top-level names.
|
|
recordDependencyOnTopLevelName(dc, Name, isCascadingUse.getValueOr(true));
|
|
lookUpTopLevelNamesInModuleScopeContext(dc);
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByPatternBindingInitializer(
|
|
PatternBindingInitializer *PBI, Optional<bool> isCascadingUse) {
|
|
assert(PBI->getBinding());
|
|
// Lazy variable initializer contexts have a 'self' parameter for
|
|
// instance member lookup.
|
|
if (auto *selfParam = PBI->getImplicitSelfDecl())
|
|
lookupNamesIntroducedByLazyVariableInitializer(PBI, selfParam,
|
|
isCascadingUse);
|
|
else if (PBI->getBinding()->getDeclContext()->isTypeContext())
|
|
lookupNamesIntroducedByInitializerOfStoredPropertyOfAType(PBI,
|
|
isCascadingUse);
|
|
else
|
|
lookupNamesIntroducedByInitializerOfGlobalOrLocal(PBI, isCascadingUse);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByLazyVariableInitializer(
|
|
PatternBindingInitializer *PBI, ParamDecl *selfParam,
|
|
Optional<bool> isCascadingUse) {
|
|
Consumer.foundDecl(selfParam, DeclVisibilityKind::FunctionParameter);
|
|
ifNotDoneYet([&] {
|
|
DeclContext *const patternContainer = PBI->getParent();
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
patternContainer,
|
|
ResultFinderForTypeContext(PBI, patternContainer),
|
|
resolveIsCascadingUse(PBI, isCascadingUse,
|
|
/*onlyCareAboutFunctionBody=*/false));
|
|
// clang-format on
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::
|
|
lookupNamesIntroducedByInitializerOfStoredPropertyOfAType(
|
|
PatternBindingInitializer *PBI, Optional<bool> isCascadingUse) {
|
|
// Initializers for stored properties of types perform static
|
|
// lookup into the surrounding context.
|
|
DeclContext *const storedPropertyContainer = PBI->getParent();
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
storedPropertyContainer,
|
|
ResultFinderForTypeContext(storedPropertyContainer, storedPropertyContainer),
|
|
resolveIsCascadingUse(storedPropertyContainer, None,
|
|
/*onlyCareAboutFunctionBody=*/false));
|
|
// clang-format on
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::
|
|
lookupNamesIntroducedByInitializerOfGlobalOrLocal(
|
|
PatternBindingInitializer *PBI, Optional<bool> isCascadingUse) {
|
|
// There's not much to find here, we'll keep going up to a parent
|
|
// context.
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
PBI,
|
|
None, // not looking in the partic type
|
|
resolveIsCascadingUse(PBI, isCascadingUse,
|
|
/*onlyCareAboutFunctionBody=*/false));
|
|
// clang-format on
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByFunctionDecl(
|
|
AbstractFunctionDecl *AFD, Optional<bool> isCascadingUseArg) {
|
|
|
|
// DOUG: how does this differ from isOutsideBodyOfFunction below?
|
|
const bool isCascadingUse =
|
|
AFD->isCascadingContextForLookup(false) &&
|
|
(isCascadingUseArg.getValueOr(
|
|
Loc.isInvalid() || !AFD->getBody() ||
|
|
!SM.rangeContainsTokenLoc(AFD->getBodySourceRange(), Loc)));
|
|
|
|
if (AFD->getDeclContext()->isTypeContext())
|
|
lookupNamesIntroducedByMemberFunction(AFD, isCascadingUse);
|
|
else
|
|
lookupNamesIntroducedByPureFunction(AFD, isCascadingUse);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByMemberFunction(
|
|
AbstractFunctionDecl *AFD, bool isCascadingUse) {
|
|
lookForLocalVariablesIn(AFD, isCascadingUse);
|
|
ifNotDoneYet(
|
|
[&] {
|
|
// If we're inside a function context, we're about to move to
|
|
// the parent DC, so we have to check the function's generic
|
|
// parameters first.
|
|
// Cannot start here in finishLookingInContext because AFD's
|
|
// getOuterParameters may be null even when AFD's parent has generics.
|
|
addGenericParametersForFunction(AFD);
|
|
},
|
|
[&] {
|
|
DeclContext *const fnDeclContext = AFD->getDeclContext();
|
|
// If we're not in the body of the function (for example, we
|
|
// might be type checking a default argument expression and
|
|
// performing name lookup from there), the base declaration
|
|
// is the nominal type, not 'self'.
|
|
DeclContext *const BaseDC =
|
|
isOutsideBodyOfFunction(AFD) ? fnDeclContext : AFD;
|
|
// If we are inside of a method, check to see if there are any ivars in
|
|
// scope, and if so, whether this is a reference to one of them.
|
|
// FIXME: We should persist this information between lookups.
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
AFD->getParent(),
|
|
ResultFinderForTypeContext(BaseDC, fnDeclContext),
|
|
isCascadingUse);
|
|
// clang-format on
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByPureFunction(
|
|
AbstractFunctionDecl *AFD, bool isCascadingUse) {
|
|
lookForLocalVariablesIn(AFD, isCascadingUse);
|
|
ifNotDoneYet([&] {
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
AFD,
|
|
None,
|
|
isCascadingUse);
|
|
});
|
|
}
|
|
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByClosure(
|
|
AbstractClosureExpr *ACE, Optional<bool> isCascadingUse) {
|
|
if (auto *CE = dyn_cast<ClosureExpr>(ACE))
|
|
lookForLocalVariablesIn(CE);
|
|
ifNotDoneYet([&] {
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
ACE,
|
|
None,
|
|
resolveIsCascadingUse(ACE, isCascadingUse,
|
|
/*onlyCareAboutFunctionBody=*/false));
|
|
// clang-format on
|
|
});
|
|
}
|
|
|
|
template <typename NominalTypeDeclOrExtensionDecl>
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByNominalTypeOrExtension(
|
|
NominalTypeDeclOrExtensionDecl *D, Optional<bool> isCascadingUse) {
|
|
// clang-format off
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
D,
|
|
shouldLookupMembers(D, Loc)
|
|
? Optional<ResultFinderForTypeContext>(ResultFinderForTypeContext(D, D))
|
|
: None,
|
|
resolveIsCascadingUse(D, isCascadingUse,
|
|
/*onlyCareAboutFunctionBody=*/false));
|
|
|
|
// clang-format on
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::
|
|
lookupNamesIntroducedByDefaultArgumentInitializer(
|
|
DefaultArgumentInitializer *I, Optional<bool> isCascadingUse) {
|
|
// In a default argument, skip immediately out of both the
|
|
// initializer and the function.
|
|
finishLookingInContext(AddGenericParameters::No, I->getParent(), None, false);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookupNamesIntroducedByMiscContext(
|
|
DeclContext *dc, Optional<bool> isCascadingUse) {
|
|
// clang-format off
|
|
assert(isa<TopLevelCodeDecl>(dc) ||
|
|
isa<Initializer>(dc) ||
|
|
isa<TypeAliasDecl>(dc) ||
|
|
isa<SubscriptDecl>(dc));
|
|
finishLookingInContext(
|
|
AddGenericParameters::Yes,
|
|
dc,
|
|
None,
|
|
resolveIsCascadingUse(DC, isCascadingUse,
|
|
/*onlyCareAboutFunctionBody=*/false));
|
|
// clang-format on
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookForLocalVariablesIn(
|
|
AbstractFunctionDecl *AFD, Optional<bool> isCascadingUse) {
|
|
// Look for local variables; normally, the parser resolves these
|
|
// for us, but it can't do the right thing inside local types.
|
|
// FIXME: when we can parse and typecheck the function body partially
|
|
// for code completion, AFD->getBody() check can be removed.
|
|
|
|
if (Loc.isInvalid() || !AFD->getBody()) {
|
|
return;
|
|
}
|
|
|
|
namelookup::FindLocalVal localVal(SM, Loc, Consumer);
|
|
localVal.visit(AFD->getBody());
|
|
|
|
ifNotDoneYet([&] {
|
|
if (auto *P = AFD->getImplicitSelfDecl())
|
|
localVal.checkValueDecl(P, DeclVisibilityKind::FunctionParameter);
|
|
localVal.checkParameterList(AFD->getParameters());
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookForLocalVariablesIn(ClosureExpr *CE) {
|
|
// Look for local variables; normally, the parser resolves these
|
|
// for us, but it can't do the right thing inside local types.
|
|
if (Loc.isInvalid())
|
|
return;
|
|
namelookup::FindLocalVal localVal(SM, Loc, Consumer);
|
|
if (auto body = CE->getBody())
|
|
localVal.visit(body);
|
|
ifNotDoneYet([&] {
|
|
if (auto params = CE->getParameters())
|
|
localVal.checkParameterList(params);
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookForLocalVariablesIn(SourceFile *SF) {
|
|
if (Loc.isInvalid())
|
|
return;
|
|
// Look for local variables in top-level code; normally, the parser
|
|
// resolves these for us, but it can't do the right thing for
|
|
// local types.
|
|
namelookup::FindLocalVal localVal(SM, Loc, Consumer);
|
|
localVal.checkSourceFile(*SF);
|
|
}
|
|
|
|
bool UnqualifiedLookupFactory::isOutsideBodyOfFunction(
|
|
const AbstractFunctionDecl *const AFD) const {
|
|
return !AFD->isImplicit() && Loc.isValid() &&
|
|
AFD->getBodySourceRange().isValid() &&
|
|
!SM.rangeContainsTokenLoc(AFD->getBodySourceRange(), Loc);
|
|
}
|
|
|
|
GenericParamList *
|
|
UnqualifiedLookupFactory::getGenericParams(const DeclContext *const dc) {
|
|
if (auto nominal = dyn_cast<NominalTypeDecl>(dc))
|
|
return nominal->getGenericParams();
|
|
if (auto ext = dyn_cast<ExtensionDecl>(dc))
|
|
return ext->getGenericParams();
|
|
if (auto subscript = dyn_cast<SubscriptDecl>(dc))
|
|
return subscript->getGenericParams();
|
|
if (auto func = dyn_cast<AbstractFunctionDecl>(dc))
|
|
return func->getGenericParams();
|
|
return nullptr;
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::addGenericParametersHereAndInEnclosingScopes(
|
|
DeclContext *dc) {
|
|
// Generics can be nested, so visit the generic list, innermost first.
|
|
// Cannot use DeclContext::forEachGenericContext because this code breaks out
|
|
// if it finds a match and isFirstResultEnough()
|
|
addGenericParametersHereAndInEnclosingScopes(getGenericParams(dc));
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::addGenericParametersHereAndInEnclosingScopes(
|
|
GenericParamList *dcGenericParams) {
|
|
if (!dcGenericParams)
|
|
return;
|
|
namelookup::FindLocalVal localVal(SM, Loc, Consumer);
|
|
localVal.checkGenericParams(dcGenericParams);
|
|
ifNotDoneYet([&] {
|
|
addGenericParametersHereAndInEnclosingScopes(
|
|
dcGenericParams->getOuterParameters());
|
|
});
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::addGenericParametersForFunction(
|
|
AbstractFunctionDecl *AFD) {
|
|
GenericParamList *GenericParams = AFD->getGenericParams();
|
|
if (GenericParams) {
|
|
namelookup::FindLocalVal localVal(SM, Loc, Consumer);
|
|
localVal.checkGenericParams(GenericParams);
|
|
}
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::ResultFinderForTypeContext::findResults(
|
|
const DeclName &Name, bool isCascadingUse, NLOptions baseNLOptions,
|
|
DeclContext *contextForLookup,
|
|
SmallVectorImpl<LookupResultEntry> &results) const {
|
|
// An optimization:
|
|
if (selfBounds.empty())
|
|
return;
|
|
const NLOptions options =
|
|
baseNLOptions | (isCascadingUse ? NL_KnownCascadingDependency
|
|
: NL_KnownNonCascadingDependency);
|
|
|
|
SmallVector<ValueDecl *, 4> Lookup;
|
|
contextForLookup->lookupQualified(selfBounds, Name, options, Lookup);
|
|
for (auto Result : Lookup)
|
|
results.push_back(LookupResultEntry(whereValueIsMember(Result), Result));
|
|
}
|
|
|
|
// TODO (someday): Instead of adding unavailable entries to Results,
|
|
// then later shunting them aside, just put them in the right place
|
|
// to begin with.
|
|
|
|
void UnqualifiedLookupFactory::setAsideUnavailableResults(
|
|
const size_t firstPossiblyUnavailableResult) {
|
|
// An optimization:
|
|
assert(Results.size() >= firstPossiblyUnavailableResult);
|
|
if (Results.size() == firstPossiblyUnavailableResult)
|
|
return;
|
|
// Predicate that determines whether a lookup result should
|
|
// be unavailable except as a last-ditch effort.
|
|
auto unavailableLookupResult = [&](const LookupResultEntry &result) {
|
|
auto &effectiveVersion = Ctx.LangOpts.EffectiveLanguageVersion;
|
|
return result.getValueDecl()->getAttrs().isUnavailableInSwiftVersion(
|
|
effectiveVersion);
|
|
};
|
|
|
|
// If all of the results we found are unavailable, keep looking.
|
|
auto begin = Results.begin() + firstPossiblyUnavailableResult;
|
|
if (std::all_of(begin, Results.end(), unavailableLookupResult)) {
|
|
// better to have more structure in results
|
|
UnavailableInnerResults.append(begin, Results.end());
|
|
Results.erase(begin, Results.end());
|
|
return;
|
|
}
|
|
// The debugger may have a different private discriminator
|
|
// in order to support lookup relative to the place where
|
|
// execution is suspended.
|
|
filterForDiscriminator(Results, DebugClient);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::recordDependencyOnTopLevelName(
|
|
DeclContext *topLevelContext, DeclName name, bool isCascadingUse) {
|
|
recordLookupOfTopLevelName(topLevelContext, Name, isCascadingUse);
|
|
recordedSF = dyn_cast<SourceFile>(topLevelContext);
|
|
recordedName = Name;
|
|
recordedIsCascadingUse = isCascadingUse;
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::addImportedResults(DeclContext *const dc) {
|
|
// Add private imports to the extra search list.
|
|
SmallVector<ModuleDecl::ImportedModule, 8> extraImports;
|
|
if (auto FU = dyn_cast<FileUnit>(dc)) {
|
|
ModuleDecl::ImportFilter importFilter;
|
|
importFilter |= ModuleDecl::ImportFilterKind::Private;
|
|
importFilter |= ModuleDecl::ImportFilterKind::ImplementationOnly;
|
|
FU->getImportedModules(extraImports, importFilter);
|
|
}
|
|
|
|
using namespace namelookup;
|
|
SmallVector<ValueDecl *, 8> CurModuleResults;
|
|
auto resolutionKind = isOriginallyTypeLookup ? ResolutionKind::TypesOnly
|
|
: ResolutionKind::Overloadable;
|
|
lookupInModule(&M, {}, Name, CurModuleResults, NLKind::UnqualifiedLookup,
|
|
resolutionKind, TypeResolver, dc, extraImports);
|
|
|
|
// Always perform name shadowing for type lookup.
|
|
if (options.contains(Flags::TypeLookup)) {
|
|
removeShadowedDecls(CurModuleResults, &M);
|
|
}
|
|
|
|
for (auto VD : CurModuleResults)
|
|
Results.push_back(LookupResultEntry(VD));
|
|
|
|
filterForDiscriminator(Results, DebugClient);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::addNamesKnownToDebugClient(DeclContext *dc) {
|
|
if (Name.isSimpleName() && DebugClient)
|
|
DebugClient->lookupAdditions(Name.getBaseName(), dc, Loc,
|
|
isOriginallyTypeLookup, Results);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::addUnavailableInnerResults() {
|
|
Results = std::move(UnavailableInnerResults);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::lookForAModuleWithTheGivenName(
|
|
DeclContext *const dc) {
|
|
using namespace namelookup;
|
|
if (!Name.isSimpleName())
|
|
return;
|
|
|
|
// Look for a module with the given name.
|
|
if (Name.isSimpleName(M.getName())) {
|
|
Results.push_back(LookupResultEntry(&M));
|
|
return;
|
|
}
|
|
ModuleDecl *desiredModule = Ctx.getLoadedModule(Name.getBaseIdentifier());
|
|
if (!desiredModule && Name == Ctx.TheBuiltinModule->getName())
|
|
desiredModule = Ctx.TheBuiltinModule;
|
|
if (desiredModule) {
|
|
forAllVisibleModules(
|
|
dc, [&](const ModuleDecl::ImportedModule &import) -> bool {
|
|
if (import.second == desiredModule) {
|
|
Results.push_back(LookupResultEntry(import.second));
|
|
return false;
|
|
}
|
|
return true;
|
|
});
|
|
}
|
|
}
|
|
|
|
#pragma mark common helper definitions
|
|
NLOptions UnqualifiedLookupFactory::computeBaseNLOptions(
|
|
const UnqualifiedLookup::Options options,
|
|
const bool isOriginallyTypeLookup) {
|
|
NLOptions baseNLOptions = NL_UnqualifiedDefault;
|
|
if (options.contains(Flags::AllowProtocolMembers))
|
|
baseNLOptions |= NL_ProtocolMembers;
|
|
if (isOriginallyTypeLookup)
|
|
baseNLOptions |= NL_OnlyTypes;
|
|
if (options.contains(Flags::IgnoreAccessControl))
|
|
baseNLOptions |= NL_IgnoreAccessControl;
|
|
return baseNLOptions;
|
|
}
|
|
|
|
bool UnqualifiedLookupFactory::isFirstResultEnough()
|
|
const {
|
|
return !Results.empty() && !options.contains(Flags::IncludeOuterResults);
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::recordCompletionOfAScope() {
|
|
// OK to call (NOOP) if there are more inner results and Results is empty
|
|
if (IndexOfFirstOuterResult == 0)
|
|
IndexOfFirstOuterResult = Results.size();
|
|
}
|
|
|
|
bool UnqualifiedLookupFactory::resolveIsCascadingUse(
|
|
const DeclContext *const dc, Optional<bool> isCascadingUse,
|
|
bool onlyCareAboutFunctionBody) {
|
|
return isCascadingUse.getValueOr(dc->isCascadingContextForLookup(
|
|
/*functionsAreNonCascading=*/onlyCareAboutFunctionBody));
|
|
}
|
|
|
|
UnqualifiedLookupFactory::ResultFinderForTypeContext::
|
|
ResultFinderForTypeContext(DeclContext *dynamicContext,
|
|
DeclContext *staticContext)
|
|
: dynamicContext(dynamicContext), staticContext(staticContext),
|
|
selfBounds(findSelfBounds(staticContext)) {}
|
|
|
|
UnqualifiedLookupFactory::ResultFinderForTypeContext::SelfBounds
|
|
UnqualifiedLookupFactory::ResultFinderForTypeContext::findSelfBounds(
|
|
DeclContext *dc) {
|
|
auto nominal = dc->getSelfNominalTypeDecl();
|
|
if (!nominal)
|
|
return {};
|
|
|
|
SelfBounds selfBounds;
|
|
selfBounds.push_back(nominal);
|
|
|
|
// For a protocol extension, check whether there are additional "Self"
|
|
// constraints that can affect name lookup.
|
|
if (dc->getExtendedProtocolDecl()) {
|
|
auto ext = cast<ExtensionDecl>(dc);
|
|
auto bounds = getSelfBoundsFromWhereClause(ext);
|
|
for (auto bound : bounds.decls)
|
|
selfBounds.push_back(bound);
|
|
}
|
|
return selfBounds;
|
|
}
|
|
|
|
void UnqualifiedLookupFactory::ResultFinderForTypeContext::dump() const {
|
|
llvm::errs() << "dynamicContext: ";
|
|
dynamicContext->dumpContext();
|
|
llvm::errs() << "staticContext: ";
|
|
staticContext->dumpContext();
|
|
llvm::errs() << "selfBounds: ";
|
|
for (const auto *D : selfBounds)
|
|
D->dump(llvm::errs(), 1);
|
|
llvm::errs() << "\n";
|
|
}
|
|
|
|
#pragma mark UnqualifiedLookup functions
|
|
|
|
// clang-format off
|
|
UnqualifiedLookup::UnqualifiedLookup(DeclName Name,
|
|
DeclContext *const DC,
|
|
LazyResolver *TypeResolver,
|
|
SourceLoc Loc,
|
|
Options options)
|
|
// clang-format on
|
|
: IndexOfFirstOuterResult(0) {
|
|
UnqualifiedLookupFactory factory(Name, DC, TypeResolver, Loc, options, *this);
|
|
factory.performUnqualifiedLookup();
|
|
}
|
|
|
|
TypeDecl *UnqualifiedLookup::getSingleTypeResult() const {
|
|
if (Results.size() != 1)
|
|
return nullptr;
|
|
return dyn_cast<TypeDecl>(Results.back().getValueDecl());
|
|
}
|