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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/transform/remove_unreachable_statements.h"
#include "src/tint/transform/test_helper.h"
namespace tint::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 {
if (true) {
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));
}
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::transform