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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));
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(), ast::StorageClass::kNone, Expr(2));
auto* block = Block(Decl(var), //
Switch(Source{{12, 34}}, "a", //
Case(Literal(1))));
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));
auto* block = Block(Decl(var), //
Switch("a", //
DefaultCase(), //
Case(Literal(1)), //
DefaultCase(Source{{12, 34}})));
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 {
// var z: i32;
// continue;
// z = 1;
// }
WrapInFunction(Loop(Block(Decl(Var("z", ty.i32(), ast::StorageClass::kNone)),
create<ast::ContinueStatement>(),
Assign(Source{{12, 34}}, "z", 1))));
EXPECT_FALSE(r()->Resolve()) << r()->error();
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest,
UnreachableCode_Loop_continue_InBlocks) {
// loop {
// var z: i32;
// {{{continue;}}}
// z = 1;
// }
WrapInFunction(
Loop(Block(Decl(Var("z", ty.i32(), ast::StorageClass::kNone)),
Block(Block(Block(create<ast::ContinueStatement>()))),
Assign(Source{{12, 34}}, "z", 1))));
EXPECT_FALSE(r()->Resolve()) << r()->error();
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest, UnreachableCode_ForLoop_continue) {
// for (;;) {
// var z: i32;
// continue;
// z = 1;
// }
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_ForLoop_continue_InBlocks) {
// for (;;) {
// var z: i32;
// {{{continue;}}}
// z = 1;
// }
WrapInFunction(
For(nullptr, nullptr, nullptr,
Block(Decl(Var("z", ty.i32(), ast::StorageClass::kNone)),
Block(Block(Block(create<ast::ContinueStatement>()))),
Assign(Source{{12, 34}}, "z", 1))));
EXPECT_FALSE(r()->Resolve()) << r()->error();
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest, UnreachableCode_break) {
// switch (1) {
// 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(1, //
Case(Literal(1), Block(Break(), decl)), //
DefaultCase()))));
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(r()->error(), "12:34 error: code is unreachable");
}
TEST_F(ResolverControlBlockValidationTest, UnreachableCode_break_InBlocks) {
// loop {
// switch (1) {
// 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(1, //
Case(Literal(1), Block(Block(Block(Block(Break()))), 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));
auto* block =
Block(Decl(var), Switch("a", //
Case(Source{{12, 34}}, {Literal(1u)}), //
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 -1: {}
// default: {}
// }
auto* var = Var("a", ty.u32(), ast::StorageClass::kNone, Expr(2u));
auto* block = Block(Decl(var), //
Switch("a", //
Case(Source{{12, 34}}, {Literal(-1)}), //
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(), ast::StorageClass::kNone, Expr(3u));
auto* block = Block(Decl(var), //
Switch("a", //
Case(Literal(0u)),
Case({
Literal(Source{{12, 34}}, 2u),
Literal(3u),
Literal(Source{{56, 78}}, 2u),
}),
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(), ast::StorageClass::kNone, Expr(2));
auto* block = Block(Decl(var), //
Switch("a", //
Case(Literal(Source{{12, 34}}, -10)),
Case({
Literal(0),
Literal(1),
Literal(2),
Literal(Source{{56, 78}}, -10),
}),
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(), ast::StorageClass::kNone, Expr(2));
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 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));
auto* block = Block(Decl(var), //
Switch("a", //
DefaultCase(Source{{12, 34}}), //
Case(Literal(5))));
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));
auto* block = Block(Decl(var), //
Switch("a", DefaultCase(Source{{12, 34}})));
WrapInFunction(block);
EXPECT_TRUE(r()->Resolve()) << r()->error();
}
} // namespace
} // namespace tint