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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/lang/wgsl/ast/transform/simplify_pointers.h"
#include "src/tint/lang/wgsl/ast/transform/helper_test.h"
#include "src/tint/lang/wgsl/ast/transform/unshadow.h"
namespace tint::ast::transform {
namespace {
using SimplifyPointersTest = TransformTest;
TEST_F(SimplifyPointersTest, EmptyModule) {
auto* src = "";
EXPECT_FALSE(ShouldRun<SimplifyPointers>(src));
}
TEST_F(SimplifyPointersTest, FoldPointer) {
auto* src = R"(
fn f() {
var v : i32;
let p : ptr<function, i32> = &v;
let x : i32 = *p;
}
)";
auto* expect = R"(
fn f() {
var v : i32;
let x : i32 = v;
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, UnusedPointerParam) {
auto* src = R"(
fn f(p : ptr<function, i32>) {
}
)";
auto* expect = src;
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, ReferencedPointerParam) {
auto* src = R"(
fn f(p : ptr<function, i32>) {
let x = p;
}
)";
auto* expect = R"(
fn f(p : ptr<function, i32>) {
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, AddressOfDeref) {
auto* src = R"(
fn f() {
var v : i32;
let p : ptr<function, i32> = &(v);
let x : ptr<function, i32> = &(*(p));
let y : ptr<function, i32> = &(*(&(*(p))));
let z : ptr<function, i32> = &(*(&(*(&(*(&(*(p))))))));
var a = *x;
var b = *y;
var c = *z;
}
)";
auto* expect = R"(
fn f() {
var v : i32;
var a = v;
var b = v;
var c = v;
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, DerefAddressOf) {
auto* src = R"(
fn f() {
var v : i32;
let x : i32 = *(&(v));
let y : i32 = *(&(*(&(v))));
let z : i32 = *(&(*(&(*(&(*(&(v))))))));
}
)";
auto* expect = R"(
fn f() {
var v : i32;
let x : i32 = v;
let y : i32 = v;
let z : i32 = v;
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, ComplexChain) {
auto* src = R"(
fn f() {
var a : array<mat4x4<f32>, 4>;
let ap : ptr<function, array<mat4x4<f32>, 4>> = &a;
let mp : ptr<function, mat4x4<f32>> = &(*ap)[3];
let vp : ptr<function, vec4<f32>> = &(*mp)[2];
let v : vec4<f32> = *vp;
}
)";
auto* expect = R"(
fn f() {
var a : array<mat4x4<f32>, 4>;
let v : vec4<f32> = a[3][2];
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, SavedVars) {
auto* src = R"(
struct S {
i : i32,
};
fn arr() {
var a : array<S, 2>;
var i : i32 = 0;
var j : i32 = 0;
let p : ptr<function, i32> = &a[i + j].i;
i = 2;
*p = 4;
}
fn matrix() {
var m : mat3x3<f32>;
var i : i32 = 0;
var j : i32 = 0;
let p : ptr<function, vec3<f32>> = &m[i + j];
i = 2;
*p = vec3<f32>(4.0, 5.0, 6.0);
}
)";
auto* expect = R"(
struct S {
i : i32,
}
fn arr() {
var a : array<S, 2>;
var i : i32 = 0;
var j : i32 = 0;
let p_save = (i + j);
i = 2;
a[p_save].i = 4;
}
fn matrix() {
var m : mat3x3<f32>;
var i : i32 = 0;
var j : i32 = 0;
let p_save_1 = (i + j);
i = 2;
m[p_save_1] = vec3<f32>(4.0, 5.0, 6.0);
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, DontSaveLiterals) {
auto* src = R"(
fn f() {
var arr : array<i32, 2>;
let p1 : ptr<function, i32> = &arr[1];
*p1 = 4;
}
)";
auto* expect = R"(
fn f() {
var arr : array<i32, 2>;
arr[1] = 4;
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, SavedVarsChain) {
auto* src = R"(
fn f() {
var arr : array<array<i32, 2>, 2>;
let i : i32 = 0;
let j : i32 = 1;
let p : ptr<function, array<i32, 2>> = &arr[i];
let q : ptr<function, i32> = &(*p)[j];
*q = 12;
}
)";
auto* expect = R"(
fn f() {
var arr : array<array<i32, 2>, 2>;
let i : i32 = 0;
let j : i32 = 1;
let p_save = i;
let q_save = j;
arr[p_save][q_save] = 12;
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, ForLoopInit) {
auto* src = R"(
fn foo() -> i32 {
return 1;
}
@fragment
fn main() {
var arr = array<f32, 4>();
for (let a = &arr[foo()]; ;) {
let x = *a;
break;
}
}
)";
auto* expect = R"(
fn foo() -> i32 {
return 1;
}
@fragment
fn main() {
var arr = array<f32, 4>();
let a_save = foo();
for(; ; ) {
let x = arr[a_save];
break;
}
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, MultiSavedVarsInSinglePtrLetExpr) {
auto* src = R"(
fn x() -> i32 {
return 1;
}
fn y() -> i32 {
return 1;
}
fn z() -> i32 {
return 1;
}
struct Inner {
a : array<i32, 2>,
};
struct Outer {
a : array<Inner, 2>,
};
fn f() {
var arr : array<Outer, 2>;
let p : ptr<function, i32> = &arr[x()].a[y()].a[z()];
*p = 1;
*p = 2;
}
)";
auto* expect = R"(
fn x() -> i32 {
return 1;
}
fn y() -> i32 {
return 1;
}
fn z() -> i32 {
return 1;
}
struct Inner {
a : array<i32, 2>,
}
struct Outer {
a : array<Inner, 2>,
}
fn f() {
var arr : array<Outer, 2>;
let p_save = x();
let p_save_1 = y();
let p_save_2 = z();
arr[p_save].a[p_save_1].a[p_save_2] = 1;
arr[p_save].a[p_save_1].a[p_save_2] = 2;
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
TEST_F(SimplifyPointersTest, ShadowPointer) {
auto* src = R"(
var<private> a : array<i32, 2>;
@compute @workgroup_size(1)
fn main() {
let x = &a;
var a : i32 = (*x)[0];
{
var a : i32 = (*x)[1];
}
}
)";
auto* expect = R"(
var<private> a : array<i32, 2>;
@compute @workgroup_size(1)
fn main() {
var a_1 : i32 = a[0];
{
var a_2 : i32 = a[1];
}
}
)";
auto got = Run<Unshadow, SimplifyPointers>(src);
EXPECT_EQ(expect, str(got));
}
} // namespace
} // namespace tint::ast::transform