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// 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/lang/core/ir/var.h"
#include "src/tint/lang/core/ir/store.h"
#include "src/tint/utils/debug/debug.h"
TINT_INSTANTIATE_TYPEINFO(tint::ir::Var);
namespace tint::ir {
Var::Var(InstructionResult* result) {
if (result && result->Type()) {
TINT_ASSERT(IR, result->Type()->Is<type::Pointer>());
}
// Default to no initializer.
AddOperand(Var::kInitializerOperandOffset, nullptr);
AddResult(result);
}
Var::~Var() = default;
void Var::SetInitializer(Value* initializer) {
SetOperand(Var::kInitializerOperandOffset, initializer);
}
void Var::DestroyIfOnlyAssigned() {
auto* result = Result();
if (result->Usages().All([](const Usage& u) { return u.instruction->Is<ir::Store>(); })) {
while (!result->Usages().IsEmpty()) {
auto& usage = *result->Usages().begin();
usage.instruction->Destroy();
}
Destroy();
}
}
} // namespace tint::ir