| // 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_SWITCH_H_ |
| #define SRC_TINT_IR_SWITCH_H_ |
| |
| #include "src/tint/ir/control_instruction.h" |
| |
| // Forward declarations |
| namespace tint::ir { |
| class Constant; |
| class MultiInBlock; |
| } // namespace tint::ir |
| |
| namespace tint::ir { |
| /// Switch instruction. |
| /// |
| /// ``` |
| /// in |
| /// ┃ |
| /// ╌╌╌╌╌╌╌╌┲━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━┱╌╌╌╌╌╌╌╌ |
| /// ▼ ▼ ▼ |
| /// ┌────────┐ ┌────────┐ ┌────────┐ |
| /// │ Case A │ │ Case B │ │ Case C │ |
| /// └────────┘ └────────┘ └────────┘ |
| /// ExitSwitch ┃ ExitSwitch ┃ ExitSwitch ┃ |
| /// ┃ ┃ ┃ |
| /// ╌╌╌╌╌╌╌╌┺━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━┹╌╌╌╌╌╌╌╌ |
| /// ┃ |
| /// ▼ |
| /// out |
| /// ``` |
| class Switch : public utils::Castable<Switch, ControlInstruction> { |
| public: |
| /// The offset in Operands() for the condition |
| static constexpr size_t kConditionOperandOffset = 0; |
| |
| /// A case selector |
| struct CaseSelector { |
| /// @returns true if this is a default selector |
| bool IsDefault() { return val == nullptr; } |
| |
| /// The selector value, or nullptr if this is the default selector |
| Constant* val = nullptr; |
| }; |
| |
| /// A case label in the struct |
| struct Case { |
| /// The case selector for this node |
| utils::Vector<CaseSelector, 4> selectors; |
| /// The case block. |
| ir::Block* block = nullptr; |
| |
| /// @returns the case block |
| ir::Block* Block() { return block; } |
| }; |
| |
| /// Constructor |
| /// @param cond the condition |
| explicit Switch(Value* cond); |
| ~Switch() override; |
| |
| /// @copydoc ControlInstruction::ForeachBlock |
| void ForeachBlock(const std::function<void(ir::Block*)>& cb) override; |
| |
| /// @returns the switch cases |
| utils::Vector<Case, 4>& Cases() { return cases_; } |
| |
| /// @returns the condition |
| Value* Condition() { return operands_[kConditionOperandOffset]; } |
| |
| private: |
| utils::Vector<Case, 4> cases_; |
| }; |
| |
| } // namespace tint::ir |
| |
| #endif // SRC_TINT_IR_SWITCH_H_ |