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// 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