| // Copyright 2021 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "src/tint/ast/break_statement.h" |
| #include "src/tint/ast/continue_statement.h" |
| #include "src/tint/ast/fallthrough_statement.h" |
| #include "src/tint/ast/switch_statement.h" |
| #include "src/tint/resolver/resolver_test_helper.h" |
| |
| using namespace tint::number_suffixes; // NOLINT |
| |
| namespace tint::resolver { |
| namespace { |
| |
| class ResolverControlBlockValidationTest : public TestHelper, public testing::Test {}; |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchSelectorExpression_F32) { |
| // var a : f32 = 3.14; |
| // switch (a) { |
| // default: {} |
| // } |
| auto* var = Var("a", ty.f32(), Expr(3.14_f)); |
| |
| auto* block = Block(Decl(var), Switch(Expr(Source{{12, 34}}, "a"), // |
| DefaultCase())); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: switch statement selector expression must be of a " |
| "scalar integer type"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchSelectorExpression_bool) { |
| // var a : bool = true; |
| // switch (a) { |
| // default: {} |
| // } |
| auto* var = Var("a", ty.bool_(), Expr(false)); |
| |
| auto* block = Block(Decl(var), Switch(Expr(Source{{12, 34}}, "a"), // |
| DefaultCase())); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: switch statement selector expression must be of a " |
| "scalar integer type"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchWithoutDefault_Fail) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // case 1: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch(Source{{12, 34}}, "a", // |
| Case(CaseSelector(1_i)))); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), "12:34 error: switch statement must have a default clause"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchWithTwoDefault_Fail) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // default: {} |
| // case 1: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Source{{9, 2}}), // |
| Case(CaseSelector(1_i)), // |
| DefaultCase(Source{{12, 34}}))); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), R"(12:34 error: switch statement must have exactly one default clause |
| 9:2 note: previous default case)"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchWithTwoDefault_OneInCase_Fail) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // case 1, default: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block( |
| Decl(var), // |
| Switch("a", // |
| Case(utils::Vector{CaseSelector(1_i), DefaultCaseSelector(Source{{9, 2}})}), // |
| DefaultCase(Source{{12, 34}}))); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), R"(12:34 error: switch statement must have exactly one default clause |
| 9:2 note: previous default case)"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchWithTwoDefault_SameCase) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // case default, 1, default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = |
| Block(Decl(var), // |
| Switch("a", // |
| Case(utils::Vector{DefaultCaseSelector(Source{{9, 2}}), CaseSelector(1_i), |
| DefaultCaseSelector(Source{{12, 34}})}))); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), R"(12:34 error: switch statement must have exactly one default clause |
| 9:2 note: previous default case)"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchWithTwoDefault_DifferentMultiCase) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // case 1, default: {} |
| // case default, 2: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block( |
| Decl(var), // |
| Switch("a", // |
| Case(utils::Vector{CaseSelector(1_i), DefaultCaseSelector(Source{{9, 2}})}), |
| Case(utils::Vector{DefaultCaseSelector(Source{{12, 34}}), CaseSelector(2_i)}))); |
| |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), R"(12:34 error: switch statement must have exactly one default clause |
| 9:2 note: previous default case)"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, UnreachableCode_Loop_continue) { |
| // loop { |
| // if (false) { break; } |
| // var z: i32; |
| // continue; |
| // z = 1; |
| // } |
| auto* decl_z = Decl(Var("z", ty.i32())); |
| auto* cont = Continue(); |
| auto* assign_z = Assign(Source{{12, 34}}, "z", 1_i); |
| WrapInFunction(Loop(Block(If(false, Block(Break())), decl_z, cont, assign_z))); |
| |
| ASSERT_TRUE(r()->Resolve()) << r()->error(); |
| EXPECT_EQ(r()->error(), "12:34 warning: code is unreachable"); |
| EXPECT_TRUE(Sem().Get(decl_z)->IsReachable()); |
| EXPECT_TRUE(Sem().Get(cont)->IsReachable()); |
| EXPECT_FALSE(Sem().Get(assign_z)->IsReachable()); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, UnreachableCode_Loop_continue_InBlocks) { |
| // loop { |
| // if (false) { break; } |
| // var z: i32; |
| // {{{continue;}}} |
| // z = 1; |
| // } |
| auto* decl_z = Decl(Var("z", ty.i32())); |
| auto* cont = Continue(); |
| auto* assign_z = Assign(Source{{12, 34}}, "z", 1_i); |
| WrapInFunction( |
| Loop(Block(If(false, Block(Break())), decl_z, Block(Block(Block(cont))), assign_z))); |
| |
| ASSERT_TRUE(r()->Resolve()) << r()->error(); |
| EXPECT_EQ(r()->error(), "12:34 warning: code is unreachable"); |
| EXPECT_TRUE(Sem().Get(decl_z)->IsReachable()); |
| EXPECT_TRUE(Sem().Get(cont)->IsReachable()); |
| EXPECT_FALSE(Sem().Get(assign_z)->IsReachable()); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, UnreachableCode_ForLoop_continue) { |
| // for (;false;) { |
| // var z: i32; |
| // continue; |
| // z = 1; |
| // } |
| auto* decl_z = Decl(Var("z", ty.i32())); |
| auto* cont = Continue(); |
| auto* assign_z = Assign(Source{{12, 34}}, "z", 1_i); |
| WrapInFunction(For(nullptr, false, nullptr, // |
| Block(decl_z, cont, assign_z))); |
| |
| ASSERT_TRUE(r()->Resolve()) << r()->error(); |
| EXPECT_EQ(r()->error(), "12:34 warning: code is unreachable"); |
| EXPECT_TRUE(Sem().Get(decl_z)->IsReachable()); |
| EXPECT_TRUE(Sem().Get(cont)->IsReachable()); |
| EXPECT_FALSE(Sem().Get(assign_z)->IsReachable()); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, UnreachableCode_ForLoop_continue_InBlocks) { |
| // for (;false;) { |
| // var z: i32; |
| // {{{continue;}}} |
| // z = 1; |
| // } |
| auto* decl_z = Decl(Var("z", ty.i32())); |
| auto* cont = Continue(); |
| auto* assign_z = Assign(Source{{12, 34}}, "z", 1_i); |
| WrapInFunction( |
| For(nullptr, false, nullptr, Block(decl_z, Block(Block(Block(cont))), assign_z))); |
| |
| ASSERT_TRUE(r()->Resolve()) << r()->error(); |
| EXPECT_EQ(r()->error(), "12:34 warning: code is unreachable"); |
| EXPECT_TRUE(Sem().Get(decl_z)->IsReachable()); |
| EXPECT_TRUE(Sem().Get(cont)->IsReachable()); |
| EXPECT_FALSE(Sem().Get(assign_z)->IsReachable()); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, UnreachableCode_break) { |
| // switch (1i) { |
| // case 1i: { |
| // var z: i32; |
| // break; |
| // z = 1i; |
| // default: {} |
| // } |
| auto* decl_z = Decl(Var("z", ty.i32())); |
| auto* brk = Break(); |
| auto* assign_z = Assign(Source{{12, 34}}, "z", 1_i); |
| WrapInFunction( // |
| Block(Switch(1_i, // |
| Case(CaseSelector(1_i), Block(decl_z, brk, assign_z)), // |
| DefaultCase()))); |
| |
| ASSERT_TRUE(r()->Resolve()) << r()->error(); |
| EXPECT_EQ(r()->error(), "12:34 warning: code is unreachable"); |
| EXPECT_TRUE(Sem().Get(decl_z)->IsReachable()); |
| EXPECT_TRUE(Sem().Get(brk)->IsReachable()); |
| EXPECT_FALSE(Sem().Get(assign_z)->IsReachable()); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, UnreachableCode_break_InBlocks) { |
| // loop { |
| // switch (1i) { |
| // case 1i: { {{{break;}}} var a : u32 = 2;} |
| // default: {} |
| // } |
| // break; |
| // } |
| auto* decl_z = Decl(Var("z", ty.i32())); |
| auto* brk = Break(); |
| auto* assign_z = Assign(Source{{12, 34}}, "z", 1_i); |
| WrapInFunction(Loop( |
| Block(Switch(1_i, // |
| Case(CaseSelector(1_i), Block(decl_z, Block(Block(Block(brk))), assign_z)), |
| DefaultCase()), // |
| Break()))); |
| |
| ASSERT_TRUE(r()->Resolve()) << r()->error(); |
| EXPECT_EQ(r()->error(), "12:34 warning: code is unreachable"); |
| EXPECT_TRUE(Sem().Get(decl_z)->IsReachable()); |
| EXPECT_TRUE(Sem().Get(brk)->IsReachable()); |
| EXPECT_FALSE(Sem().Get(assign_z)->IsReachable()); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchConditionTypeMustMatchSelectorType2_Fail) { |
| // var a : u32 = 2; |
| // switch (a) { |
| // case 1i: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), Switch("a", // |
| Case(CaseSelector(Source{{12, 34}}, 1_u)), // |
| DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: the case selector values must have the same type as " |
| "the selector expression."); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchConditionTypeMustMatchSelectorType_Fail) { |
| // var a : u32 = 2; |
| // switch (a) { |
| // case -1i: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.u32(), Expr(2_u)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(CaseSelector(Source{{12, 34}}, -1_i)), // |
| DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: the case selector values must have the same type as " |
| "the selector expression."); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, NonUniqueCaseSelectorValueUint_Fail) { |
| // var a : u32 = 3; |
| // switch (a) { |
| // case 0u: {} |
| // case 2u, 3u, 2u: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.u32(), Expr(3_u)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(CaseSelector(0_u)), |
| Case(utils::Vector{ |
| CaseSelector(Source{{12, 34}}, 2_u), |
| CaseSelector(3_u), |
| CaseSelector(Source{{56, 78}}, 2_u), |
| }), |
| DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "56:78 error: duplicate switch case '2'\n" |
| "12:34 note: previous case declared here"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, NonUniqueCaseSelectorValueSint_Fail) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // case -10: {} |
| // case 0,1,2,-10: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(CaseSelector(Source{{12, 34}}, -10_i)), |
| Case(utils::Vector{ |
| CaseSelector(0_i), |
| CaseSelector(1_i), |
| CaseSelector(2_i), |
| CaseSelector(Source{{56, 78}}, -10_i), |
| }), |
| DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "56:78 error: duplicate switch case '-10'\n" |
| "12:34 note: previous case declared here"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, LastClauseLastStatementIsFallthrough_Fail) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // default: { fallthrough; } |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| auto* fallthrough = create<ast::FallthroughStatement>(Source{{12, 34}}); |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Block(fallthrough)))); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: a fallthrough statement must not be used in the last " |
| "switch case"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchCase_Pass) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // default: {} |
| // case 5: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Source{{12, 34}}), // |
| Case(CaseSelector(5_i)))); |
| WrapInFunction(block); |
| |
| EXPECT_TRUE(r()->Resolve()) << r()->error(); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchCase_Expression_Pass) { |
| // var a : i32 = 2; |
| // switch (a) { |
| // default: {} |
| // case 5 + 6: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Source{{12, 34}}), // |
| Case(CaseSelector(Add(5_i, 6_i))))); |
| WrapInFunction(block); |
| |
| EXPECT_TRUE(r()->Resolve()) << r()->error(); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchCase_Expression_MixI32_Abstract) { |
| // var a = 2; |
| // switch (a) { |
| // default: {} |
| // case 5i + 6i: {} |
| // } |
| auto* var = Var("a", Expr(2_a)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Source{{12, 34}}), // |
| Case(CaseSelector(Add(5_i, 6_i))))); |
| WrapInFunction(block); |
| |
| EXPECT_TRUE(r()->Resolve()) << r()->error(); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchCase_Expression_MixU32_Abstract) { |
| // var a = 2u; |
| // switch (a) { |
| // default: {} |
| // case 5 + 6: {} |
| // } |
| auto* var = Var("a", Expr(2_u)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Source{{12, 34}}), // |
| Case(CaseSelector(Add(5_a, 6_a))))); |
| WrapInFunction(block); |
| |
| EXPECT_TRUE(r()->Resolve()) << r()->error(); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchCase_Expression_Multiple) { |
| // var a = 2u; |
| // switch (a) { |
| // default: {} |
| // case 5 + 6, 7+9, 2*4: {} |
| // } |
| auto* var = Var("a", Expr(2_u)); |
| |
| auto* block = |
| Block(Decl(var), // |
| Switch("a", // |
| DefaultCase(Source{{12, 34}}), // |
| Case(utils::Vector{CaseSelector(Add(5_u, 6_u)), CaseSelector(Add(7_u, 9_u)), |
| CaseSelector(Mul(2_u, 4_u))}))); |
| WrapInFunction(block); |
| |
| EXPECT_TRUE(r()->Resolve()) << r()->error(); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, SwitchCaseAlias_Pass) { |
| // type MyInt = u32; |
| // var v: MyInt; |
| // switch(v){ |
| // default: {} |
| // } |
| |
| auto* my_int = Alias("MyInt", ty.u32()); |
| auto* var = Var("a", ty.Of(my_int), Expr(2_u)); |
| auto* block = Block(Decl(var), // |
| Switch("a", DefaultCase(Source{{12, 34}}))); |
| |
| WrapInFunction(block); |
| |
| EXPECT_TRUE(r()->Resolve()) << r()->error(); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, NonUniqueCaseSelector_Expression_Fail) { |
| // var a : i32 = 2i; |
| // switch (a) { |
| // case 10i: {} |
| // case 5i+5i: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(CaseSelector(Source{{12, 34}}, 10_i)), |
| Case(CaseSelector(Source{{56, 78}}, Add(5_i, 5_i))), DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "56:78 error: duplicate switch case '10'\n" |
| "12:34 note: previous case declared here"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, NonUniqueCaseSelectorSameCase_BothExpression_Fail) { |
| // var a : i32 = 2i; |
| // switch (a) { |
| // case 5i+5i, 6i+4i: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(utils::Vector{CaseSelector(Source{{56, 78}}, Add(5_i, 5_i)), |
| CaseSelector(Source{{12, 34}}, Add(6_i, 4_i))}), |
| DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: duplicate switch case '10'\n" |
| "56:78 note: previous case declared here"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, NonUniqueCaseSelectorSame_Case_Expression_Fail) { |
| // var a : i32 = 2i; |
| // switch (a) { |
| // case 5u+5u, 10i: {} |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(utils::Vector{CaseSelector(Source{{56, 78}}, Add(5_i, 5_i)), |
| CaseSelector(Source{{12, 34}}, 10_i)}), |
| DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), |
| "12:34 error: duplicate switch case '10'\n" |
| "56:78 note: previous case declared here"); |
| } |
| |
| TEST_F(ResolverControlBlockValidationTest, Switch_OverrideCondition_Fail) { |
| // override a : i32 = 2; |
| // switch (a) { |
| // default: {} |
| // } |
| auto* var = Var("a", ty.i32(), Expr(2_i)); |
| Override("b", ty.i32(), Expr(2_i)); |
| |
| auto* block = Block(Decl(var), // |
| Switch("a", // |
| Case(CaseSelector(Source{{12, 34}}, "b")), DefaultCase())); |
| WrapInFunction(block); |
| |
| EXPECT_FALSE(r()->Resolve()); |
| EXPECT_EQ(r()->error(), "12:34 error: case selector must be a constant expression"); |
| } |
| |
| } // namespace |
| } // namespace tint::resolver |
