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// Copyright 2022 The Dawn & Tint Authors
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#ifndef SRC_TINT_LANG_CORE_IR_LOOP_H_
#define SRC_TINT_LANG_CORE_IR_LOOP_H_
#include <string>
#include "src/tint/lang/core/ir/control_instruction.h"
#include "src/tint/utils/containers/const_propagating_ptr.h"
// Forward declarations
namespace tint::core::ir {
class MultiInBlock;
} // namespace tint::core::ir
namespace tint::core::ir {
/// Loop instruction.
///
/// ```
/// in
/// ┃
/// ┣━━━━━━━━━━━┓
/// ▼ ┃
/// ┌─────────────────┐ ┃
/// │ Initializer │ ┃
/// │ (optional) │ ┃
/// └─────────────────┘ ┃
/// NextIteration ┃ ┃
/// ┃◀━━━━━━━━━━┫
/// ▼ ┃
/// ┌─────────────────┐ ┃
/// ┏━━│ Body │ ┃
/// ┃ └─────────────────┘ ┃
/// ┃ Continue ┃ ┃ NextIteration
/// ┃ ▼ ┃
/// ┃ ┌─────────────────┐ ┃ BreakIf(false)
/// ExitLoop ┃ │ Continuing │━━┛
/// ┃ │ (optional) │
/// ┃ └─────────────────┘
/// ┃ ┃
/// ┃ ┃ BreakIf(true)
/// ┗━━━━━━━━━━▶┃
/// ▼
/// out
///
/// ```
class Loop final : public Castable<Loop, ControlInstruction> {
public:
/// Constructor
/// @param i the initializer block
/// @param b the body block
/// @param c the continuing block
Loop(ir::Block* i, ir::MultiInBlock* b, ir::MultiInBlock* c);
~Loop() override;
/// @copydoc Instruction::Clone()
Loop* Clone(CloneContext& ctx) override;
/// @copydoc ControlInstruction::ForeachBlock
void ForeachBlock(const std::function<void(ir::Block*)>& cb) override;
/// @returns the switch initializer block
ir::Block* Initializer() { return initializer_; }
/// @returns the switch initializer block
const ir::Block* Initializer() const { return initializer_; }
/// @returns true if the loop uses an initializer block. If true, then the Loop first branches
/// to the initializer block, otherwise it first branches to the body block.
bool HasInitializer();
/// @returns the switch start block
ir::MultiInBlock* Body() { return body_; }
/// @returns the switch start block
const ir::MultiInBlock* Body() const { return body_; }
/// @returns the switch continuing block
ir::MultiInBlock* Continuing() { return continuing_; }
/// @returns the switch continuing block
const ir::MultiInBlock* Continuing() const { return continuing_; }
/// @returns the friendly name for the instruction
std::string FriendlyName() const override { return "loop"; }
private:
ConstPropagatingPtr<ir::Block> initializer_;
ConstPropagatingPtr<ir::MultiInBlock> body_;
ConstPropagatingPtr<ir::MultiInBlock> continuing_;
};
} // namespace tint::core::ir
#endif // SRC_TINT_LANG_CORE_IR_LOOP_H_