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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.
#ifndef SRC_TINT_IR_CONTROL_INSTRUCTION_H_
#define SRC_TINT_IR_CONTROL_INSTRUCTION_H_
#include <utility>
#include "src/tint/ir/operand_instruction.h"
// Forward declarations
namespace tint::ir {
class Block;
class Exit;
} // namespace tint::ir
namespace tint::ir {
/// Base class of instructions that perform control flow to two or more blocks, owned by the
/// ControlInstruction.
class ControlInstruction : public utils::Castable<ControlInstruction, OperandInstruction<1, 1>> {
public:
/// Destructor
~ControlInstruction() override;
/// Calls @p cb for each block owned by this control instruction
/// @param cb the function to call once for each block
virtual void ForeachBlock(const std::function<void(ir::Block*)>& cb) = 0;
/// Sets the results of the control instruction
/// @param values the new result values
void SetResults(utils::VectorRef<InstructionResult*> values) {
for (auto* value : results_) {
value->SetSource(nullptr);
}
results_ = std::move(values);
for (auto* value : results_) {
value->SetSource(this);
}
}
/// Sets the results of the control instruction
/// @param values the new result values
template <typename... ARGS,
typename = std::enable_if_t<!utils::IsVectorLike<
utils::traits::Decay<utils::traits::NthTypeOf<0, ARGS..., void>>>>>
void SetResults(ARGS&&... values) {
SetResults(utils::Vector{std::forward<ARGS>(values)...});
}
/// @return All the exits for the flow control instruction
const utils::Hashset<Exit*, 2>& Exits() const { return exits_; }
/// Adds the exit to the flow control instruction
/// @param exit the exit instruction
void AddExit(Exit* exit);
/// Removes the exit to the flow control instruction
/// @param exit the exit instruction
void RemoveExit(Exit* exit);
protected:
/// The flow control exits
utils::Hashset<Exit*, 2> exits_;
};
} // namespace tint::ir
#endif // SRC_TINT_IR_CONTROL_INSTRUCTION_H_