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// Copyright 2020 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 <memory>
#include "gtest/gtest.h"
#include "src/ast/assignment_statement.h"
#include "src/ast/float_literal.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/kill_statement.h"
#include "src/ast/loop_statement.h"
#include "src/ast/module.h"
#include "src/ast/return_statement.h"
#include "src/ast/type/f32_type.h"
#include "src/ast/variable.h"
#include "src/ast/variable_decl_statement.h"
#include "src/writer/msl/generator_impl.h"
namespace tint {
namespace writer {
namespace msl {
namespace {
using MslGeneratorImplTest = testing::Test;
TEST_F(MslGeneratorImplTest, Emit_Loop) {
ast::StatementList body;
body.push_back(std::make_unique<ast::KillStatement>());
ast::LoopStatement l(std::move(body), {});
ast::Module m;
GeneratorImpl g(&m);
g.increment_indent();
ASSERT_TRUE(g.EmitStatement(&l)) << g.error();
EXPECT_EQ(g.result(), R"( for(;;) {
discard_fragment();
}
)");
}
TEST_F(MslGeneratorImplTest, Emit_LoopWithContinuing) {
ast::StatementList body;
body.push_back(std::make_unique<ast::KillStatement>());
ast::StatementList continuing;
continuing.push_back(std::make_unique<ast::ReturnStatement>());
ast::LoopStatement l(std::move(body), std::move(continuing));
ast::Module m;
GeneratorImpl g(&m);
g.increment_indent();
ASSERT_TRUE(g.EmitStatement(&l)) << g.error();
EXPECT_EQ(g.result(), R"( {
bool tint_msl_is_first_1 = true;
for(;;) {
if (!tint_msl_is_first_1) {
return;
}
tint_msl_is_first_1 = false;
discard_fragment();
}
}
)");
}
TEST_F(MslGeneratorImplTest, Emit_LoopNestedWithContinuing) {
ast::type::F32Type f32;
ast::StatementList body;
body.push_back(std::make_unique<ast::KillStatement>());
ast::StatementList continuing;
continuing.push_back(std::make_unique<ast::ReturnStatement>());
auto inner = std::make_unique<ast::LoopStatement>(std::move(body),
std::move(continuing));
body.push_back(std::move(inner));
auto lhs = std::make_unique<ast::IdentifierExpression>("lhs");
auto rhs = std::make_unique<ast::IdentifierExpression>("rhs");
continuing.push_back(std::make_unique<ast::AssignmentStatement>(
std::move(lhs), std::move(rhs)));
ast::LoopStatement outer(std::move(body), std::move(continuing));
ast::Module m;
GeneratorImpl g(&m);
g.increment_indent();
ASSERT_TRUE(g.EmitStatement(&outer)) << g.error();
EXPECT_EQ(g.result(), R"( {
bool tint_msl_is_first_1 = true;
for(;;) {
if (!tint_msl_is_first_1) {
lhs = rhs;
}
tint_msl_is_first_1 = false;
{
bool tint_msl_is_first_2 = true;
for(;;) {
if (!tint_msl_is_first_2) {
return;
}
tint_msl_is_first_2 = false;
discard_fragment();
}
}
}
}
)");
}
// TODO(dsinclair): Make this work when we have variable declarations.
TEST_F(MslGeneratorImplTest, DISABLED_Emit_LoopWithVarUsedInContinuing) {
ast::type::F32Type f32;
auto var = std::make_unique<ast::Variable>(
"lhs", ast::StorageClass::kFunction, &f32);
var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::FloatLiteral>(&f32, 2.4)));
ast::StatementList body;
body.push_back(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
body.push_back(std::make_unique<ast::VariableDeclStatement>(
std::make_unique<ast::Variable>("other", ast::StorageClass::kFunction,
&f32)));
ast::StatementList continuing;
auto lhs = std::make_unique<ast::IdentifierExpression>("lhs");
auto rhs = std::make_unique<ast::IdentifierExpression>("rhs");
continuing.push_back(std::make_unique<ast::AssignmentStatement>(
std::move(lhs), std::move(rhs)));
ast::LoopStatement outer(std::move(body), std::move(continuing));
ast::Module m;
GeneratorImpl g(&m);
g.increment_indent();
ASSERT_TRUE(g.EmitStatement(&outer)) << g.error();
EXPECT_EQ(g.result(), R"( {
float lhs;
bool tint_msl_is_first_1 = true;
for(;;) {
if (!tint_msl_is_first_1) {
lhs = rhs;
}
tint_msl_is_first_1 = false;
lhs = 2.4;
float other;
}
}
)");
}
} // namespace
} // namespace msl
} // namespace writer
} // namespace tint