// Copyright 2023 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/writer/spirv/test_helper_ir.h"

namespace tint::writer::spirv {
namespace {

TEST_F(SpvGeneratorImplTest, Function_Empty) {
    auto* func = CreateFunction();
    func->name = ir.symbols.Register("foo");
    func->return_type = ir.types.Get<type::Void>();

    generator_.EmitFunction(func);
    EXPECT_EQ(DumpModule(generator_.Module()), R"(OpName %1 "foo"
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%1 = OpFunction %2 None %3
%4 = OpLabel
OpReturn
OpFunctionEnd
)");
}

// Test that we do not emit the same function type more than once.
TEST_F(SpvGeneratorImplTest, Function_DeduplicateType) {
    auto* func = CreateFunction();
    func->return_type = ir.types.Get<type::Void>();

    generator_.EmitFunction(func);
    generator_.EmitFunction(func);
    generator_.EmitFunction(func);
    EXPECT_EQ(DumpTypes(), R"(%2 = OpTypeVoid
%3 = OpTypeFunction %2
)");
}

}  // namespace
}  // namespace tint::writer::spirv