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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/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