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ef8825bfe6
LLVM has removed llvm::Optional, move over to std::optional. Also clang-format to fix up all the renamed #includes.
345 lines
13 KiB
C++
345 lines
13 KiB
C++
//===--- ConstraintGenerationTests.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 - 2022 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/AST/Expr.h"
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#include "llvm/Support/Casting.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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static Expr *applySolution(ConstraintSystem &cs, Expr *expr,
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Solution &solution) {
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SyntacticElementTarget target(expr, cs.DC, CTP_Unused, Type(),
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/*isDiscarded=*/false);
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auto result = cs.applySolution(solution, target);
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return result ? result->getAsExpr() : nullptr;
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}
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static Type getTypeOfCoercedExpr(ExplicitCastExpr *castExpr) {
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return castExpr->getSubExpr()->getType();
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}
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TEST_F(SemaTest, TestImplicitForceCastConstraintGeneration) {
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto *literal = IntegerLiteralExpr::createFromUnsigned(Context, 42, SourceLoc());
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auto *castExpr = ForcedCheckedCastExpr::createImplicit(Context, literal,
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Context.TheAnyType);
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auto *expr = cs.generateConstraints(castExpr, DC);
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ASSERT_NE(expr, nullptr);
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SmallVector<Solution, 2> solutions;
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cs.solve(solutions);
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ASSERT_EQ(solutions.size(), (unsigned)1);
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auto &solution = solutions.front();
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ASSERT_TRUE(solution.getResolvedType(literal)->isEqual(getStdlibType("Int")));
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ASSERT_TRUE(solution.getResolvedType(castExpr)->isEqual(Context.TheAnyType));
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auto *resultExpr = applySolution(cs, expr, solution);
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ASSERT_NE(resultExpr, nullptr);
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ASSERT_TRUE(getTypeOfCoercedExpr(cast<ForcedCheckedCastExpr>(resultExpr))
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->isEqual(getStdlibType("Int")));
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}
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TEST_F(SemaTest, TestImplicitCoercionConstraintGeneration) {
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto *literal = IntegerLiteralExpr::createFromUnsigned(Context, 42, SourceLoc());
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auto *castExpr = CoerceExpr::createImplicit(Context, literal,
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getStdlibType("Double"));
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auto *expr = cs.generateConstraints(castExpr, DC);
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ASSERT_NE(expr, nullptr);
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SmallVector<Solution, 2> solutions;
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cs.solve(solutions);
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ASSERT_EQ(solutions.size(), (unsigned)1);
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auto &solution = solutions.front();
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ASSERT_TRUE(solution.getResolvedType(literal)->isEqual(getStdlibType("Double")));
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ASSERT_TRUE(
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solution.getResolvedType(castExpr)->isEqual(getStdlibType("Double")));
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auto *resultExpr = applySolution(cs, expr, solution);
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ASSERT_NE(resultExpr, nullptr);
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ASSERT_TRUE(getTypeOfCoercedExpr(cast<CoerceExpr>(resultExpr))
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->isEqual(getStdlibType("Double")));
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}
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TEST_F(SemaTest, TestImplicitConditionalCastConstraintGeneration) {
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto *literal = IntegerLiteralExpr::createFromUnsigned(Context, 42, SourceLoc());
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auto *castExpr = ConditionalCheckedCastExpr::createImplicit(
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Context, literal, getStdlibType("Double"));
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auto *expr = cs.generateConstraints(castExpr, DC);
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ASSERT_NE(expr, nullptr);
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SmallVector<Solution, 2> solutions;
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cs.solve(solutions);
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ASSERT_EQ(solutions.size(), (unsigned)1);
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auto &solution = solutions.front();
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ASSERT_TRUE(solution.getResolvedType(literal)->isEqual(getStdlibType("Int")));
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ASSERT_TRUE(solution.getResolvedType(castExpr)->isEqual(
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OptionalType::get(getStdlibType("Double"))));
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auto *resultExpr = applySolution(cs, expr, solution);
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ASSERT_NE(resultExpr, nullptr);
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ASSERT_TRUE(getTypeOfCoercedExpr(cast<ConditionalCheckedCastExpr>(resultExpr))
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->isEqual(getStdlibType("Int")));
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}
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TEST_F(SemaTest, TestCaptureListIsNotOpenedEarly) {
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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DeclAttributes attrs;
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auto *closure = new (Context) ClosureExpr(attrs,
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/*bracetRange=*/SourceRange(),
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/*capturedSelfDecl=*/nullptr,
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ParameterList::createEmpty(Context),
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/*asyncLoc=*/SourceLoc(),
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/*throwsLoc=*/SourceLoc(),
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/*thrownType*/nullptr,
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/*arrowLoc=*/SourceLoc(),
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/*inLoc=*/SourceLoc(),
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/*explicitResultType=*/nullptr, DC);
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closure->setImplicit();
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// Create a return statement so this is treated as a single expression.
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auto *RS = ReturnStmt::createImplied(
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Context, TupleExpr::createImplicit(Context, {}, {}));
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closure->setBody(BraceStmt::createImplicit(Context, /*elements=*/{RS}));
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SmallVector<CaptureListEntry> captures;
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{
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// The capture variable.
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auto *xVar = new (Context)
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VarDecl(/*isStatic=*/false, VarDecl::Introducer::Var,
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/*loc=*/SourceLoc(), Context.getIdentifier("x"), DC);
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xVar->setImplicit();
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auto *PBD = PatternBindingDecl::createImplicit(
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Context, StaticSpellingKind::None,
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/*pattern=*/NamedPattern::createImplicit(Context, xVar),
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IntegerLiteralExpr::createFromUnsigned(Context, 42, SourceLoc()), DC);
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captures.push_back(CaptureListEntry(PBD));
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}
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auto *captureList = CaptureListExpr::create(Context, captures, closure);
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// _ = { [x = 42] in }
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Expr *assign = new (Context)
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AssignExpr(new (Context) DiscardAssignmentExpr(/*loc=*/SourceLoc(),
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/*Implicit=*/true),
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/*EqualLoc=*/SourceLoc(), captureList, /*Implicit=*/true);
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auto *processed = cs.generateConstraints(assign, DC);
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ASSERT_NE(processed, nullptr);
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for (const auto &capture : captureList->getCaptureList()) {
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ASSERT_FALSE(cs.hasType(capture.getVar()));
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}
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auto *closureType = cs.getType(closure)->castTo<TypeVariableType>();
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ASTExtInfo extInfo;
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ASSERT_TRUE(cs.resolveClosure(
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closureType,
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FunctionType::get(/*params*/ {}, Context.TheEmptyTupleType, extInfo),
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cs.getConstraintLocator(closure)));
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for (const auto &capture : captureList->getCaptureList()) {
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ASSERT_TRUE(cs.hasType(capture.getVar()));
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}
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}
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TEST_F(SemaTest, TestMultiStmtClosureBodyParentAndDepth) {
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// {
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// ()
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// return ()
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// }
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DeclAttributes attrs;
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auto *closure = new (Context) ClosureExpr(attrs,
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/*braceRange=*/SourceRange(),
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/*capturedSelfDecl=*/nullptr,
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ParameterList::createEmpty(Context),
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/*asyncLoc=*/SourceLoc(),
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/*throwsLoc=*/SourceLoc(),
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/*thrownType*/ nullptr,
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/*arrowLoc=*/SourceLoc(),
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/*inLoc=*/SourceLoc(),
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/*explicitResultType=*/nullptr, DC);
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closure->setImplicit();
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auto *RS = ReturnStmt::createImplicit(
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Context, TupleExpr::createImplicit(Context, {}, {}));
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closure->setBody(BraceStmt::createImplicit(Context, {
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TupleExpr::createImplicit(Context, {}, {}), RS
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}));
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SyntacticElementTarget target(closure, DC, ContextualTypeInfo(),
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/*isDiscarded*/ true);
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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cs.solve(target);
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ASSERT_EQ(cs.getParentExpr(closure), nullptr);
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ASSERT_EQ(cs.getExprDepth(closure), 0);
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// We visit the ReturnStmt twice when computing the parent map, ensure we
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// don't invalidate its parent on the second walk during the conjunction.
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auto *result = RS->getResult();
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ASSERT_EQ(cs.getParentExpr(result), closure);
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ASSERT_EQ(cs.getExprDepth(result), 1);
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}
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TEST_F(SemaTest, TestIfExprLocator) {
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// Test to make sure we get the expected conjunction and locators.
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// if true { 1 } else { 2 }
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auto *ifCond = new (Context) BooleanLiteralExpr(true, SourceLoc());
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auto *thenBrace = BraceStmt::createImplicit(
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Context,
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{IntegerLiteralExpr::createFromUnsigned(Context, 1, SourceLoc())});
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auto *elseBrace = BraceStmt::createImplicit(
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Context,
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{IntegerLiteralExpr::createFromUnsigned(Context, 2, SourceLoc())});
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auto *ifStmt =
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new (Context) IfStmt(SourceLoc(), ifCond, thenBrace, SourceLoc(),
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elseBrace, /*implicit*/ true, Context);
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auto *ifExpr = SingleValueStmtExpr::createWithWrappedBranches(
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Context, ifStmt, DC, /*mustBeExpr*/ true);
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SyntacticElementTarget target(ifExpr, DC, ContextualTypeInfo(),
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/*isDiscarded*/ true);
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto hadError = cs.generateConstraints(target);
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ASSERT_FALSE(hadError);
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auto *conjunction = &cs.getConstraints().front();
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ASSERT_EQ(conjunction->getKind(), ConstraintKind::Conjunction);
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auto nested = conjunction->getNestedConstraints();
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ASSERT_EQ(nested.size(), 4);
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auto *condConstraint = nested[0];
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auto *thenConstraint = nested[1];
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auto *elseConstraint = nested[2];
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auto *joinConstraint = nested[3];
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auto *ifStmtLoc =
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cs.getConstraintLocator(ifExpr, LocatorPathElt::SyntacticElement(ifStmt));
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auto *condLoc =
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cs.getConstraintLocator(ifStmtLoc, LocatorPathElt::Condition());
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ASSERT_EQ(condConstraint->getLocator(), condLoc);
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auto *thenLoc =
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cs.getConstraintLocator(ifStmtLoc, LocatorPathElt::TernaryBranch(true));
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ASSERT_EQ(thenConstraint->getLocator(), thenLoc);
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auto *elseLoc =
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cs.getConstraintLocator(ifStmtLoc, LocatorPathElt::TernaryBranch(false));
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ASSERT_EQ(elseConstraint->getLocator(), elseLoc);
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auto *joinLoc = cs.getConstraintLocator(
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ifStmtLoc,
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LocatorPathElt::SyntacticElement(joinConstraint->getSyntacticElement()));
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ASSERT_EQ(joinConstraint->getLocator(), joinLoc);
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}
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TEST_F(SemaTest, TestSwitchExprLocator) {
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// Test to make sure we get the expected conjunction and locators.
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// case true: 1
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auto *trueBrace = BraceStmt::createImplicit(
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Context,
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{IntegerLiteralExpr::createFromUnsigned(Context, 1, SourceLoc())});
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auto *truePattern = ExprPattern::createImplicit(
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Context, new (Context) BooleanLiteralExpr(true, SourceLoc()), DC);
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auto *trueCase =
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CaseStmt::create(Context, CaseParentKind::Switch, SourceLoc(),
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{CaseLabelItem(truePattern)}, SourceLoc(), SourceLoc(),
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trueBrace, /*caseBodyVars*/ std::nullopt);
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// case false: 2
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auto *falseBrace = BraceStmt::createImplicit(
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Context,
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{IntegerLiteralExpr::createFromUnsigned(Context, 2, SourceLoc())});
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auto *falsePattern = ExprPattern::createImplicit(
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Context, new (Context) BooleanLiteralExpr(false, SourceLoc()), DC);
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auto *falseCase =
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CaseStmt::create(Context, CaseParentKind::Switch, SourceLoc(),
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{CaseLabelItem(falsePattern)}, SourceLoc(), SourceLoc(),
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falseBrace, /*caseBodyVars*/ std::nullopt);
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auto *subject = new (Context) BooleanLiteralExpr(true, SourceLoc());
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// switch true { case true: 1 case false: 2 }
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auto *switchStmt = SwitchStmt::create(LabeledStmtInfo(), SourceLoc(), subject,
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SourceLoc(), {trueCase, falseCase},
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SourceLoc(), SourceLoc(), Context);
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auto *switchExpr = SingleValueStmtExpr::createWithWrappedBranches(
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Context, switchStmt, DC, /*mustBeExpr*/ true);
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SyntacticElementTarget target(switchExpr, DC, ContextualTypeInfo(),
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/*isDiscarded*/ true);
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ConstraintSystem cs(DC, ConstraintSystemOptions());
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auto hadError = cs.generateConstraints(target);
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ASSERT_FALSE(hadError);
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auto *conjunction = &cs.getConstraints().front();
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ASSERT_EQ(conjunction->getKind(), ConstraintKind::Conjunction);
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auto nested = conjunction->getNestedConstraints();
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ASSERT_EQ(nested.size(), 4);
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auto *subjectConstraint = nested[0];
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auto *trueConstraint = nested[1];
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auto *falseConstraint = nested[2];
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auto *joinConstraint = nested[3];
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auto *switchStmtLoc = cs.getConstraintLocator(
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switchExpr, LocatorPathElt::SyntacticElement(switchStmt));
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// These currently all get the switch statement locator.
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ASSERT_EQ(subjectConstraint->getLocator(), switchStmtLoc);
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ASSERT_EQ(trueConstraint->getLocator(), switchStmtLoc);
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ASSERT_EQ(falseConstraint->getLocator(), switchStmtLoc);
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auto *joinLoc = cs.getConstraintLocator(
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switchStmtLoc,
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LocatorPathElt::SyntacticElement(joinConstraint->getSyntacticElement()));
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ASSERT_EQ(joinConstraint->getLocator(), joinLoc);
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}
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