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// Copyright 2022 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.
#ifndef SRC_TINT_IR_BLOCK_H_
#define SRC_TINT_IR_BLOCK_H_
#include "src/tint/ir/block_param.h"
#include "src/tint/ir/branch.h"
#include "src/tint/ir/flow_node.h"
#include "src/tint/ir/instruction.h"
#include "src/tint/utils/vector.h"
namespace tint::ir {
/// A flow node comprising a block of statements. The instructions in the block are a linear list of
/// instructions to execute. The block will branch at the end. The only blocks which do not branch
/// are the end blocks of functions.
class Block : public utils::Castable<Block, FlowNode> {
public:
/// Constructor
Block();
~Block() override;
/// @returns true if this is a dead block. This can happen in the case like a loop merge block
/// which is never reached.
bool IsDead() const override { return branch.target == nullptr; }
/// The node this block branches too.
Branch branch = {};
/// The instructions in the block
utils::Vector<const Instruction*, 16> instructions;
/// The parameters passed into the block
utils::Vector<const BlockParam*, 0> params;
};
} // namespace tint::ir
#endif // SRC_TINT_IR_BLOCK_H_