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// Copyright 2023 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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#ifndef SRC_TINT_LANG_CORE_IR_CONTROL_INSTRUCTION_H_
#define SRC_TINT_LANG_CORE_IR_CONTROL_INSTRUCTION_H_
#include <utility>
#include "src/tint/lang/core/ir/operand_instruction.h"
// Forward declarations
namespace tint::core::ir {
class Block;
class Exit;
} // namespace tint::core::ir
namespace tint::core::ir {
/// Base class of instructions that perform control flow to two or more blocks, owned by the
/// ControlInstruction.
class ControlInstruction : public Castable<ControlInstruction, OperandInstruction<1, 1>> {
public:
/// Constructor
ControlInstruction();
/// 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;
/// @return All the exits for the flow control instruction
const 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);
/// @copydoc Instruction::Destroy
void Destroy() override;
protected:
/// The flow control exits
Hashset<Exit*, 2> exits_;
};
} // namespace tint::core::ir
#endif // SRC_TINT_LANG_CORE_IR_CONTROL_INSTRUCTION_H_