chromium/third_party/dawn/src/tint/lang/core/ir/loop.h

// Copyright 2022 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#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> { … };

}  // namespace tint::core::ir

#endif  // SRC_TINT_LANG_CORE_IR_LOOP_H_