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a0919f73b0
Instead of adding specific accessors directly to ConstraintLocator::PathElement, add subclasses that expose these accessors.
426 lines
11 KiB
C++
426 lines
11 KiB
C++
//===--- ConstraintLocator.cpp - Constraint Locator -----------------------===//
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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 \c ConstraintLocator class and its related types,
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// which is used by the constraint-based type checker to describe how
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// a particular constraint was derived.
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//
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//===----------------------------------------------------------------------===//
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#include "ConstraintLocator.h"
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#include "ConstraintSystem.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Expr.h"
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#include "swift/AST/Types.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace swift;
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using namespace constraints;
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void ConstraintLocator::Profile(llvm::FoldingSetNodeID &id, Expr *anchor,
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ArrayRef<PathElement> path) {
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id.AddPointer(anchor);
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id.AddInteger(path.size());
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for (auto elt : path) {
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id.AddInteger(elt.getKind());
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switch (elt.getKind()) {
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case GenericParameter:
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id.AddPointer(elt.castTo<LocatorPathElt::GenericParameter>().getType());
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break;
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case Requirement:
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id.AddPointer(elt.castTo<LocatorPathElt::Requirement>().getDecl());
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break;
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case Witness:
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id.AddPointer(elt.castTo<LocatorPathElt::Witness>().getDecl());
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break;
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case KeyPathDynamicMember: {
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auto kpElt = elt.castTo<LocatorPathElt::KeyPathDynamicMember>();
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id.AddPointer(kpElt.getKeyPathDecl());
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break;
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}
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case ApplyArgument:
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case ApplyFunction:
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case FunctionArgument:
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case DefaultArgument:
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case FunctionResult:
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case OptionalPayload:
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case Member:
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case MemberRefBase:
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case UnresolvedMember:
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case SubscriptMember:
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case ConstructorMember:
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case LValueConversion:
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case RValueAdjustment:
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case ClosureResult:
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case ParentType:
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case ExistentialSuperclassType:
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case InstanceType:
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case SequenceElementType:
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case AutoclosureResult:
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case GenericArgument:
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case NamedTupleElement:
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case TupleElement:
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case ApplyArgToParam:
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case OpenedGeneric:
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case KeyPathComponent:
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case ConditionalRequirement:
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case TypeParameterRequirement:
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case ImplicitlyUnwrappedDisjunctionChoice:
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case DynamicLookupResult:
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case ContextualType:
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case SynthesizedArgument:
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case KeyPathType:
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case KeyPathRoot:
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case KeyPathValue:
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case KeyPathComponentResult:
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auto numValues = numNumericValuesInPathElement(elt.getKind());
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for (unsigned i = 0; i < numValues; ++i)
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id.AddInteger(elt.getValue(i));
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break;
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}
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}
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}
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bool LocatorPathElt::isResultOfSingleExprFunction() const {
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if (auto elt = getAs<ContextualType>())
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return elt->isForSingleExprFunction();
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return false;
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}
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/// Determine whether given locator points to the subscript reference
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/// e.g. `foo[0]` or `\Foo.[0]`
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bool ConstraintLocator::isSubscriptMemberRef() const {
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auto *anchor = getAnchor();
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auto path = getPath();
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if (!anchor || path.empty())
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return false;
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return path.back().getKind() == ConstraintLocator::SubscriptMember;
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}
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bool ConstraintLocator::isKeyPathType() const {
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auto *anchor = getAnchor();
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auto path = getPath();
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// The format of locator should be `<keypath expr> -> key path type`
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if (!anchor || !isa<KeyPathExpr>(anchor) || path.size() != 1)
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return false;
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return path.back().getKind() == ConstraintLocator::KeyPathType;
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}
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bool ConstraintLocator::isKeyPathRoot() const {
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auto *anchor = getAnchor();
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auto path = getPath();
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if (!anchor || path.empty())
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return false;
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return path.back().getKind() == ConstraintLocator::KeyPathRoot;
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}
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bool ConstraintLocator::isKeyPathValue() const {
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auto *anchor = getAnchor();
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auto path = getPath();
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if (!anchor || path.empty())
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return false;
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return path.back().getKind() == ConstraintLocator::KeyPathValue;
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}
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bool ConstraintLocator::isResultOfKeyPathDynamicMemberLookup() const {
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return llvm::any_of(getPath(), [](const LocatorPathElt &elt) {
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return elt.isKeyPathDynamicMember();
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});
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}
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bool ConstraintLocator::isKeyPathSubscriptComponent() const {
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auto *anchor = getAnchor();
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auto *KPE = dyn_cast_or_null<KeyPathExpr>(anchor);
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if (!KPE)
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return false;
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using ComponentKind = KeyPathExpr::Component::Kind;
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return llvm::any_of(getPath(), [&](const LocatorPathElt &elt) {
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auto keyPathElt = elt.getAs<LocatorPathElt::KeyPathComponent>();
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if (!keyPathElt)
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return false;
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auto index = keyPathElt->getIndex();
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auto &component = KPE->getComponents()[index];
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return component.getKind() == ComponentKind::Subscript ||
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component.getKind() == ComponentKind::UnresolvedSubscript;
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});
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}
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bool ConstraintLocator::isForKeyPathDynamicMemberLookup() const {
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auto path = getPath();
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return !path.empty() && path.back().isKeyPathDynamicMember();
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}
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bool ConstraintLocator::isForKeyPathComponent() const {
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return llvm::any_of(getPath(), [&](const LocatorPathElt &elt) {
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return elt.isKeyPathComponent();
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});
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}
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bool ConstraintLocator::isLastElement(
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ConstraintLocator::PathElementKind expectedKind) const {
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auto path = getPath();
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return !path.empty() && path.back().getKind() == expectedKind;
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}
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bool ConstraintLocator::isForGenericParameter() const {
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return isLastElement(ConstraintLocator::GenericParameter);
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}
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bool ConstraintLocator::isForSequenceElementType() const {
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return isLastElement(ConstraintLocator::SequenceElementType);
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}
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bool ConstraintLocator::isForContextualType() const {
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return isLastElement(ConstraintLocator::ContextualType);
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}
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GenericTypeParamType *ConstraintLocator::getGenericParameter() const {
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auto path = getPath();
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assert(!path.empty());
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return path.back().castTo<LocatorPathElt::GenericParameter>().getType();
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}
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void ConstraintLocator::dump(SourceManager *sm) {
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dump(sm, llvm::errs());
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llvm::errs() << "\n";
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}
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void ConstraintLocator::dump(ConstraintSystem *CS) {
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dump(&CS->TC.Context.SourceMgr, llvm::errs());
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llvm::errs() << "\n";
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}
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void ConstraintLocator::dump(SourceManager *sm, raw_ostream &out) {
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out << "locator@" << (void*) this << " [";
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if (anchor) {
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out << Expr::getKindName(anchor->getKind());
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if (sm) {
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out << '@';
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anchor->getLoc().print(out, *sm);
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}
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}
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auto dumpReqKind = [&out](RequirementKind kind) {
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out << " (";
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switch (kind) {
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case RequirementKind::Conformance:
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out << "conformance";
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break;
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case RequirementKind::Superclass:
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out << "superclass";
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break;
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case RequirementKind::SameType:
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out << "same-type";
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break;
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case RequirementKind::Layout:
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out << "layout";
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break;
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}
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out << ")";
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};
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for (auto elt : getPath()) {
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out << " -> ";
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switch (elt.getKind()) {
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case GenericParameter: {
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auto gpElt = elt.castTo<LocatorPathElt::GenericParameter>();
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out << "generic parameter '" << gpElt.getType()->getString() << "'";
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break;
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}
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case ApplyArgument:
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out << "apply argument";
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break;
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case ApplyFunction:
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out << "apply function";
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break;
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case OptionalPayload:
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out << "optional payload";
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break;
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case ApplyArgToParam: {
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auto argElt = elt.castTo<LocatorPathElt::ApplyArgToParam>();
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out << "comparing call argument #" << llvm::utostr(argElt.getArgIdx())
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<< " to parameter #" << llvm::utostr(argElt.getParamIdx());
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break;
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}
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case ClosureResult:
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out << "closure result";
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break;
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case ConstructorMember:
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out << "constructor member";
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break;
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case FunctionArgument:
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out << "function argument";
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break;
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case DefaultArgument:
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out << "default argument";
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break;
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case FunctionResult:
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out << "function result";
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break;
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case SequenceElementType:
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out << "sequence element type";
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break;
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case GenericArgument: {
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auto genericElt = elt.castTo<LocatorPathElt::GenericArgument>();
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out << "generic argument #" << llvm::utostr(genericElt.getIndex());
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break;
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}
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case InstanceType:
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out << "instance type";
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break;
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case AutoclosureResult:
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out << "@autoclosure result";
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break;
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case Member:
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out << "member";
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break;
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case MemberRefBase:
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out << "member reference base";
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break;
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case NamedTupleElement: {
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auto tupleElt = elt.castTo<LocatorPathElt::NamedTupleElement>();
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out << "named tuple element #" << llvm::utostr(tupleElt.getIndex());
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break;
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}
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case UnresolvedMember:
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out << "unresolved member";
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break;
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case ParentType:
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out << "parent type";
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break;
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case ExistentialSuperclassType:
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out << "existential superclass type";
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break;
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case LValueConversion:
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out << "@lvalue-to-inout conversion";
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break;
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case RValueAdjustment:
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out << "rvalue adjustment";
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break;
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case SubscriptMember:
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out << "subscript member";
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break;
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case TupleElement: {
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auto tupleElt = elt.castTo<LocatorPathElt::TupleElement>();
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out << "tuple element #" << llvm::utostr(tupleElt.getIndex());
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break;
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}
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case KeyPathComponent: {
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auto kpElt = elt.castTo<LocatorPathElt::KeyPathComponent>();
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out << "key path component #" << llvm::utostr(kpElt.getIndex());
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break;
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}
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case Requirement: {
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auto reqElt = elt.castTo<LocatorPathElt::Requirement>();
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out << "requirement ";
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reqElt.getDecl()->dumpRef(out);
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break;
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}
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case Witness: {
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auto witnessElt = elt.castTo<LocatorPathElt::Witness>();
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out << "witness ";
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witnessElt.getDecl()->dumpRef(out);
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break;
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}
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case OpenedGeneric:
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out << "opened generic";
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break;
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case ConditionalRequirement: {
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auto reqElt = elt.castTo<LocatorPathElt::ConditionalRequirement>();
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out << "conditional requirement #" << llvm::utostr(reqElt.getIndex());
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dumpReqKind(reqElt.getRequirementKind());
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break;
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}
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case TypeParameterRequirement: {
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auto reqElt = elt.castTo<LocatorPathElt::TypeParameterRequirement>();
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out << "type parameter requirement #" << llvm::utostr(reqElt.getIndex());
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dumpReqKind(reqElt.getRequirementKind());
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break;
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}
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case ImplicitlyUnwrappedDisjunctionChoice:
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out << "implicitly unwrapped disjunction choice";
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break;
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case DynamicLookupResult:
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out << "dynamic lookup result";
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break;
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case ContextualType:
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if (elt.isResultOfSingleExprFunction())
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out << "expected result type of the function with a single expression";
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else
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out << "contextual type";
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break;
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case SynthesizedArgument: {
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auto argElt = elt.castTo<LocatorPathElt::SynthesizedArgument>();
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out << "synthesized argument #" << llvm::utostr(argElt.getIndex());
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break;
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}
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case KeyPathDynamicMember:
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out << "key path dynamic member lookup";
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break;
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case KeyPathType:
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out << "key path type";
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break;
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case KeyPathRoot:
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out << "key path root";
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break;
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case KeyPathValue:
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out << "key path value";
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break;
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case KeyPathComponentResult:
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out << "key path component result";
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break;
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}
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}
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out << ']';
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}
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