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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/tint/lang/core/fluent_types.h"
#include "src/tint/lang/wgsl/ast/break_statement.h"
#include "src/tint/lang/wgsl/ast/continue_statement.h"
#include "src/tint/lang/wgsl/ast/switch_statement.h"
#include "src/tint/lang/wgsl/resolver/resolver_helper_test.h"
using namespace tint::core::number_suffixes; // NOLINT
using namespace tint::core::fluent_types; // 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(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(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(Vector{CaseSelector(1_i), DefaultCaseSelector(Source{{9, 2}})}),
Case(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(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(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, 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(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(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(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");
}
constexpr size_t kMaxSwitchCaseSelectors = 16383;
TEST_F(ResolverControlBlockValidationTest, Switch_MaxSelectors_Valid) {
Vector<const ast::CaseStatement*, 0> cases;
for (size_t i = 0; i < kMaxSwitchCaseSelectors - 1; ++i) {
cases.Push(Case(CaseSelector(Expr(i32(i)))));
}
cases.Push(DefaultCase());
auto* var = Var("a", ty.i32());
auto* s = Switch("a", std::move(cases));
WrapInFunction(var, s);
EXPECT_TRUE(r()->Resolve()) << r()->error();
}
TEST_F(ResolverControlBlockValidationTest, Switch_MaxSelectors_Invalid) {
Vector<const ast::CaseStatement*, 0> cases;
for (size_t i = 0; i < kMaxSwitchCaseSelectors; ++i) {
cases.Push(Case(CaseSelector(Expr(i32(i)))));
}
cases.Push(DefaultCase());
auto* var = Var("a", ty.i32());
auto* s = Switch(Source{{12, 34}}, "a", std::move(cases));
WrapInFunction(var, s);
EXPECT_FALSE(r()->Resolve());
EXPECT_EQ(r()->error(), "12:34 error: switch statement has 16384 case selectors, max is 16383");
}
} // namespace
} // namespace tint::resolver