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95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
//===--- UnresolvedMemberLookupTests.cpp --------------------------------===//
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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 - 2020 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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#include "SemaFixture.h"
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#include "swift/Sema/ConstraintSystem.h"
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using namespace swift;
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using namespace swift::unittest;
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using namespace swift::constraints;
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TEST_F(SemaTest, TestLookupAlwaysLooksThroughOptionalBase) {
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auto *intTypeDecl = getStdlibNominalTypeDecl("Int");
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auto *optTypeDecl = getStdlibNominalTypeDecl("Optional");
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auto intType = intTypeDecl->getDeclaredType();
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auto intOptType = OptionalType::get(intType);
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auto stringType = getStdlibType("String");
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auto *intMember = addExtensionVarMember(intTypeDecl, "test", intOptType);
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addExtensionVarMember(optTypeDecl, "test", stringType);
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auto *UME = new (Context)
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UnresolvedMemberExpr(SourceLoc(), DeclNameLoc(),
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DeclNameRef(Context.getIdentifier("test")), true);
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auto *UMCRE = new (Context) UnresolvedMemberChainResultExpr(UME, UME);
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto *expr = cs.generateConstraints(UMCRE, DC);
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ASSERT_TRUE(expr);
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cs.addConstraint(
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ConstraintKind::Conversion, cs.getType(expr), intOptType,
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cs.getConstraintLocator(UMCRE, ConstraintLocator::ContextualType));
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SmallVector<Solution, 2> solutions;
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cs.solve(solutions);
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// We should have a solution.
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ASSERT_EQ(solutions.size(), 1u);
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auto &solution = solutions[0];
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auto *locator = cs.getConstraintLocator(UME,
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ConstraintLocator::UnresolvedMember);
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auto choice = solution.getOverloadChoice(locator).choice;
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// The `test` member on `Int` should be selected.
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ASSERT_EQ(choice.getDecl(), intMember);
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}
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TEST_F(SemaTest, TestLookupPrefersResultsOnOptionalRatherThanBase) {
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auto *intTypeDecl = getStdlibNominalTypeDecl("Int");
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auto *optTypeDecl = getStdlibNominalTypeDecl("Optional");
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auto intType = intTypeDecl->getDeclaredType();
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auto intOptType = OptionalType::get(intType);
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addExtensionVarMember(intTypeDecl, "test", intOptType);
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auto *optMember = addExtensionVarMember(optTypeDecl, "test", intType);
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auto *UME = new (Context)
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UnresolvedMemberExpr(SourceLoc(), DeclNameLoc(),
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DeclNameRef(Context.getIdentifier("test")), true);
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auto *UMCRE = new (Context) UnresolvedMemberChainResultExpr(UME, UME);
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto *expr = cs.generateConstraints(UMCRE, DC);
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ASSERT_TRUE(expr);
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cs.addConstraint(
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ConstraintKind::Conversion, cs.getType(expr), intOptType,
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cs.getConstraintLocator(expr, ConstraintLocator::ContextualType));
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SmallVector<Solution, 2> solutions;
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cs.solve(solutions);
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// We should have a solution.
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ASSERT_EQ(solutions.size(), 1u);
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auto &solution = solutions[0];
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auto *locator = cs.getConstraintLocator(UME,
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ConstraintLocator::UnresolvedMember);
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auto choice = solution.getOverloadChoice(locator).choice;
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auto score = solution.getFixedScore();
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// The `test` member on `Optional` should be chosen over the member on `Int`,
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// even though the score is otherwise worse.
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ASSERT_EQ(score.Data[SK_ValueToOptional], 1u);
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ASSERT_EQ(choice.getDecl(), optMember);
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}
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