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// 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/ast/break_statement.h"
#include "src/ast/continue_statement.h"
#include "src/ast/fallthrough_statement.h"
#include "src/ast/switch_statement.h"
#include "src/resolver/resolver_test_helper.h"
namespace tint {
namespace {
class ResolverControlBlockValidationTest : public resolver::TestHelper,
public testing::Test {};
TEST_F(ResolverControlBlockValidationTest,
SwitchSelectorExpressionNoneIntegerType_Fail) {
// var a : f32 = 3.14;
// switch (a) {
// default: {}
// }
auto* var = Var("a", ty.f32(), ast::StorageClass::kNone, Expr(3.14f));
ast::CaseStatementList body;
auto* block_default = Block();
body.push_back(
create<ast::CaseStatement>(ast::CaseSelectorList{}, block_default));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(
Expr(Source{Source::Location{12, 34}}, "a"), body));
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(), ast::StorageClass::kNone, Expr(2));
ast::CaseSelectorList csl;
csl.push_back(Literal(1));
ast::CaseStatementList body;
body.push_back(create<ast::CaseStatement>(csl, Block()));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(
Source{Source::Location{12, 34}}, Expr("a"), body));
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(), ast::StorageClass::kNone, Expr(2));
ast::CaseStatementList switch_body;
ast::CaseSelectorList default_csl_1;
auto* block_default_1 = Block();
switch_body.push_back(
create<ast::CaseStatement>(default_csl_1, block_default_1));
ast::CaseSelectorList csl_case_1;
csl_case_1.push_back(Literal(1));
auto* block_case_1 = Block();
switch_body.push_back(create<ast::CaseStatement>(csl_case_1, block_case_1));
ast::CaseSelectorList default_csl_2;
auto* block_default_2 = Block();
switch_body.push_back(create<ast::CaseStatement>(
Source{Source::Location{12, 34}}, default_csl_2, block_default_2));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), switch_body));
WrapInFunction(block);
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(
r()->error(),
"12:34 error: switch statement must have exactly one default clause");
}
TEST_F(ResolverControlBlockValidationTest, UnreachableCode_Loop_continue) {
// loop {
// continue;
// var z : i32;
// }
WrapInFunction(Loop(Block(
create<ast::ContinueStatement>(),
Decl(Source{{12, 34}}, Var("z", ty.i32(), ast::StorageClass::kNone)))));
EXPECT_FALSE(r()->Resolve()) << r()->error();
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest, UnreachableCode_ForLoop_continue) {
// for (;;;) {
// continue;
// var z : i32;
// }
WrapInFunction(
For(nullptr, nullptr, nullptr,
Block(create<ast::ContinueStatement>(),
Decl(Source{{12, 34}},
Var("z", ty.i32(), ast::StorageClass::kNone)))));
EXPECT_FALSE(r()->Resolve()) << r()->error();
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest, UnreachableCode_break) {
// switch (a) {
// case 1: { break; var a : u32 = 2;}
// default: {}
// }
auto* decl = Decl(Source{{12, 34}},
Var("a", ty.i32(), ast::StorageClass::kNone, Expr(2)));
WrapInFunction(Loop(Block(Switch(
Expr(1), Case(Literal(1), Block(create<ast::BreakStatement>(), decl)),
DefaultCase()))));
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest,
SwitchConditionTypeMustMatchSelectorType2_Fail) {
// var a : u32 = 2;
// switch (a) {
// case 1: {}
// default: {}
// }
auto* var = Var("a", ty.i32(), ast::StorageClass::kNone, Expr(2));
ast::CaseStatementList switch_body;
ast::CaseSelectorList csl;
csl.push_back(create<ast::UintLiteral>(1u));
switch_body.push_back(create<ast::CaseStatement>(
Source{Source::Location{12, 34}}, csl, Block()));
ast::CaseSelectorList default_csl;
auto* block_default = Block();
switch_body.push_back(create<ast::CaseStatement>(default_csl, block_default));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), switch_body));
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 -1: {}
// default: {}
// }
auto* var = Var("a", ty.u32(), ast::StorageClass::kNone, Expr(2u));
ast::CaseStatementList switch_body;
ast::CaseSelectorList csl;
csl.push_back(Literal(-1));
switch_body.push_back(create<ast::CaseStatement>(
Source{Source::Location{12, 34}}, csl, Block()));
ast::CaseSelectorList default_csl;
auto* block_default = Block();
switch_body.push_back(create<ast::CaseStatement>(default_csl, block_default));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), switch_body));
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 0: {}
// case 2, 2: {}
// default: {}
// }
auto* var = Var("a", ty.u32(), ast::StorageClass::kNone, Expr(3u));
ast::CaseStatementList switch_body;
ast::CaseSelectorList csl_1;
csl_1.push_back(create<ast::UintLiteral>(0u));
switch_body.push_back(create<ast::CaseStatement>(csl_1, Block()));
ast::CaseSelectorList csl_2;
csl_2.push_back(create<ast::UintLiteral>(2u));
csl_2.push_back(create<ast::UintLiteral>(2u));
switch_body.push_back(create<ast::CaseStatement>(
Source{Source::Location{12, 34}}, csl_2, Block()));
ast::CaseSelectorList default_csl;
auto* block_default = Block();
switch_body.push_back(create<ast::CaseStatement>(default_csl, block_default));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), switch_body));
WrapInFunction(block);
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(r()->error(),
"12:34 error: a literal value must not appear more than once in "
"the case selectors for a switch statement: '2u'");
}
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(), ast::StorageClass::kNone, Expr(2));
ast::CaseStatementList switch_body;
ast::CaseSelectorList csl_1;
csl_1.push_back(Literal(10));
switch_body.push_back(create<ast::CaseStatement>(csl_1, Block()));
ast::CaseSelectorList csl_2;
csl_2.push_back(Literal(0));
csl_2.push_back(Literal(1));
csl_2.push_back(Literal(2));
csl_2.push_back(Literal(10));
switch_body.push_back(create<ast::CaseStatement>(
Source{Source::Location{12, 34}}, csl_2, Block()));
ast::CaseSelectorList default_csl;
auto* block_default = Block();
switch_body.push_back(create<ast::CaseStatement>(default_csl, block_default));
auto* block =
Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), switch_body));
WrapInFunction(block);
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(r()->error(),
"12:34 error: a literal value must not appear more than once in "
"the case selectors for a switch statement: '10'");
}
TEST_F(ResolverControlBlockValidationTest,
LastClauseLastStatementIsFallthrough_Fail) {
// var a : i32 = 2;
// switch (a) {
// default: { fallthrough; }
// }
auto* var = Var("a", ty.i32(), ast::StorageClass::kNone, Expr(2));
ast::CaseSelectorList default_csl;
auto* block_default = Block(
create<ast::FallthroughStatement>(Source{Source::Location{12, 34}}));
ast::CaseStatementList body;
body.push_back(create<ast::CaseStatement>(default_csl, block_default));
auto* block = Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), body));
WrapInFunction(block);
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(r()->error(),
"12:34 error: a fallthrough statement must not appear as the last "
"statement in last clause of a switch");
}
TEST_F(ResolverControlBlockValidationTest, SwitchCase_Pass) {
// var a : i32 = 2;
// switch (a) {
// default: {}
// case 5: {}
// }
auto* var = Var("a", ty.i32(), ast::StorageClass::kNone, Expr(2));
ast::CaseSelectorList default_csl;
auto* block_default = Block();
ast::CaseStatementList body;
body.push_back(create<ast::CaseStatement>(Source{Source::Location{12, 34}},
default_csl, block_default));
ast::CaseSelectorList case_csl;
case_csl.push_back(Literal(5));
auto* block_case = Block();
body.push_back(create<ast::CaseStatement>(case_csl, block_case));
auto* block = Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), body));
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), ast::StorageClass::kNone, Expr(2u));
ast::CaseSelectorList default_csl;
auto* block_default = Block();
ast::CaseStatementList body;
body.push_back(create<ast::CaseStatement>(Source{Source::Location{12, 34}},
default_csl, block_default));
auto* block = Block(Decl(var), create<ast::SwitchStatement>(Expr("a"), body));
WrapInFunction(block);
EXPECT_TRUE(r()->Resolve()) << r()->error();
}
} // namespace
} // namespace tint