| // 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/transform/fold_trivial_single_use_lets.h" |
| |
| #include "src/tint/transform/test_helper.h" |
| |
| namespace tint::transform { |
| namespace { |
| |
| using FoldTrivialSingleUseLetsTest = TransformTest; |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, EmptyModule) { |
| auto* src = ""; |
| auto* expect = ""; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, Single) { |
| auto* src = R"( |
| fn f() { |
| let x = 1; |
| _ = x; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| _ = 1; |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, Multiple) { |
| auto* src = R"( |
| fn f() { |
| let x = 1; |
| let y = 2; |
| let z = 3; |
| _ = x + y + z; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| _ = ((1 + 2) + 3); |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, Chained) { |
| auto* src = R"( |
| fn f() { |
| let x = 1; |
| let y = x; |
| let z = y; |
| _ = z; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| _ = 1; |
| } |
| )"; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, NoFold_NonTrivialLet) { |
| auto* src = R"( |
| fn function_with_posssible_side_effect() -> i32 { |
| return 1; |
| } |
| |
| fn f() { |
| let x = 1; |
| let y = function_with_posssible_side_effect(); |
| _ = (x + y); |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, NoFold_NonTrivialLet_OutOfOrder) { |
| auto* src = R"( |
| fn f() { |
| let x = 1; |
| let y = function_with_posssible_side_effect(); |
| _ = (x + y); |
| } |
| |
| fn function_with_posssible_side_effect() -> i32 { |
| return 1; |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, NoFold_UseInSubBlock) { |
| auto* src = R"( |
| fn f() { |
| let x = 1; |
| { |
| _ = x; |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, NoFold_MultipleUses) { |
| auto* src = R"( |
| fn f() { |
| let x = 1; |
| _ = (x + x); |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(FoldTrivialSingleUseLetsTest, NoFold_Shadowing) { |
| auto* src = R"( |
| fn f() { |
| var y = 1; |
| let x = y; |
| { |
| let y = false; |
| _ = (x + x); |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<FoldTrivialSingleUseLets>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| } // namespace |
| } // namespace tint::transform |