| // 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: |
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| // 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. |
| // |
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| // this software without specific prior written permission. |
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| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| |
| #ifndef SRC_TINT_LANG_CORE_IR_SWITCH_H_ |
| #define SRC_TINT_LANG_CORE_IR_SWITCH_H_ |
| |
| #include <string> |
| #include <utility> |
| |
| #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 Constant; |
| class MultiInBlock; |
| } // namespace tint::core::ir |
| |
| namespace tint::core::ir { |
| /// Switch instruction. |
| /// |
| /// ``` |
| /// in |
| /// ┃ |
| /// ╌╌╌╌╌╌╌╌┲━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━┱╌╌╌╌╌╌╌╌ |
| /// ▼ ▼ ▼ |
| /// ┌────────┐ ┌────────┐ ┌────────┐ |
| /// │ Case A │ │ Case B │ │ Case C │ |
| /// └────────┘ └────────┘ └────────┘ |
| /// ExitSwitch ┃ ExitSwitch ┃ ExitSwitch ┃ |
| /// ┃ ┃ ┃ |
| /// ╌╌╌╌╌╌╌╌┺━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━┹╌╌╌╌╌╌╌╌ |
| /// ┃ |
| /// ▼ |
| /// out |
| /// ``` |
| class Switch final : public 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() const { return val == nullptr; } |
| |
| /// The selector value, or nullptr if this is the default selector |
| ConstPropagatingPtr<Constant> val; |
| }; |
| |
| /// A case label in the struct |
| struct Case { |
| /// The case selector for this node |
| Vector<CaseSelector, 4> selectors; |
| |
| /// The case block. |
| ConstPropagatingPtr<ir::Block> block; |
| }; |
| |
| /// Constructor (no results, no operands, no cases) |
| Switch(); |
| |
| /// Constructor |
| /// @param cond the condition |
| explicit Switch(Value* cond); |
| ~Switch() override; |
| |
| /// @copydoc Instruction::Clone() |
| Switch* Clone(CloneContext& ctx) override; |
| |
| /// @copydoc ControlInstruction::ForeachBlock |
| void ForeachBlock(const std::function<void(ir::Block*)>& cb) override; |
| |
| /// @copydoc ControlInstruction::ForeachBlock |
| void ForeachBlock(const std::function<void(const ir::Block*)>& cb) const override; |
| |
| /// @returns the switch cases |
| Vector<Case, 4>& Cases() { return cases_; } |
| |
| /// @returns the switch cases |
| VectorRef<Case> Cases() const { return cases_; } |
| |
| /// @returns the condition |
| Value* Condition() { return Operand(kConditionOperandOffset); } |
| |
| /// @returns the condition |
| const Value* Condition() const { return Operand(kConditionOperandOffset); } |
| |
| /// @returns the friendly name for the instruction |
| std::string FriendlyName() const override { return "switch"; } |
| |
| private: |
| Vector<Case, 4> cases_; |
| }; |
| |
| } // namespace tint::core::ir |
| |
| #endif // SRC_TINT_LANG_CORE_IR_SWITCH_H_ |