| // Copyright 2021 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "src/tint/lang/wgsl/ast/transform/remove_unreachable_statements.h" |
| |
| #include "src/tint/lang/wgsl/ast/transform/helper_test.h" |
| |
| namespace tint::ast::transform { |
| namespace { |
| |
| using RemoveUnreachableStatementsTest = TransformTest; |
| |
| TEST_F(RemoveUnreachableStatementsTest, ShouldRunEmptyModule) { |
| auto* src = R"()"; |
| |
| EXPECT_FALSE(ShouldRun<RemoveUnreachableStatements>(src)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, ShouldRunHasNoUnreachable) { |
| auto* src = R"( |
| fn f() { |
| if (true) { |
| var x = 1; |
| } |
| } |
| )"; |
| |
| EXPECT_FALSE(ShouldRun<RemoveUnreachableStatements>(src)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, ShouldRunHasUnreachable) { |
| auto* src = R"( |
| fn f() { |
| return; |
| if (true) { |
| var x = 1; |
| } |
| } |
| )"; |
| |
| EXPECT_TRUE(ShouldRun<RemoveUnreachableStatements>(src)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, EmptyModule) { |
| auto* src = ""; |
| auto* expect = ""; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, Return) { |
| auto* src = R"( |
| fn f() { |
| return; |
| var remove_me = 1; |
| if (true) { |
| var remove_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| return; |
| } |
| )"; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, NestedReturn) { |
| auto* src = R"( |
| fn f() { |
| { |
| { |
| return; |
| } |
| } |
| var remove_me = 1; |
| if (true) { |
| var remove_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| { |
| { |
| return; |
| } |
| } |
| } |
| )"; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| // Discard has "demote-to-helper" semantics, and so code following a discard statement is not |
| // considered unreachable. |
| TEST_F(RemoveUnreachableStatementsTest, Discard) { |
| auto* src = R"( |
| fn f() { |
| discard; |
| var preserve_me = 1; |
| } |
| )"; |
| |
| auto* expect = R"( |
| fn f() { |
| discard; |
| var preserve_me = 1; |
| } |
| )"; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, IfReturn) { |
| auto* src = R"( |
| fn f() { |
| if (true) { |
| return; |
| } |
| var preserve_me = 1; |
| if (true) { |
| var preserve_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, IfElseReturn) { |
| auto* src = R"( |
| fn f() { |
| if (true) { |
| } else { |
| return; |
| } |
| var preserve_me = 1; |
| if (true) { |
| var preserve_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, LoopWithConditionalBreak) { |
| auto* src = R"( |
| fn f() { |
| loop { |
| var a = 1; |
| if (true) { |
| break; |
| } |
| |
| continuing { |
| var b = 2; |
| } |
| } |
| var preserve_me = 1; |
| if (true) { |
| var preserve_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, LoopWithConditionalBreakInContinuing) { |
| auto* src = R"( |
| fn f() { |
| loop { |
| |
| continuing { |
| break if true; |
| } |
| } |
| var preserve_me = 1; |
| if (true) { |
| var preserve_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| TEST_F(RemoveUnreachableStatementsTest, SwitchCaseReturnDefaultBreak) { |
| auto* src = R"( |
| fn f() { |
| switch(1) { |
| case 0: { |
| return; |
| } |
| default: { |
| break; |
| } |
| } |
| var preserve_me = 1; |
| if (true) { |
| var preserve_me_too = 1; |
| } |
| } |
| )"; |
| |
| auto* expect = src; |
| |
| auto got = Run<RemoveUnreachableStatements>(src); |
| |
| EXPECT_EQ(expect, str(got)); |
| } |
| |
| } // namespace |
| } // namespace tint::ast::transform |