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// Copyright 2022 The Dawn & Tint Authors
//
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#ifndef SRC_TINT_LANG_CORE_IR_IF_H_
#define SRC_TINT_LANG_CORE_IR_IF_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 {
/// If instruction.
///
/// ```
/// in
/// ┃
/// ┏━━━━━━━━━━┻━━━━━━━━━━┓
/// ▼ ▼
/// ┌────────────┐ ┌────────────┐
/// │ True │ │ False │
/// | (optional) | | (optional) |
/// └────────────┘ └────────────┘
/// ExitIf ┃ ┃ ExitIf
/// ┗━━━━━━━━━━┳━━━━━━━━━━┛
/// ▼
/// out
/// ```
class If final : public Castable<If, ControlInstruction> {
public:
/// The index of the condition operand
static constexpr size_t kConditionOperandOffset = 0;
/// Constructor (no results, no operands, no blocks)
If();
/// Constructor
/// @param cond the if condition
/// @param t the true block
/// @param f the false block
If(Value* cond, ir::Block* t, ir::Block* f);
~If() override;
/// @copydoc Instruction::Clone()
If* Clone(CloneContext& ctx) override;
/// @copydoc ControlInstruction::ForeachBlock
void ForeachBlock(const std::function<void(ir::Block*)>& cb) override;
/// @returns the if condition
Value* Condition() { return operands_[kConditionOperandOffset]; }
/// @returns the if condition
const Value* Condition() const { return operands_[kConditionOperandOffset]; }
/// @returns the true block
ir::Block* True() { return true_; }
/// @returns the true block
const ir::Block* True() const { return true_; }
/// @param block the new true block
void SetTrue(ir::Block* block);
/// @returns the false block
ir::Block* False() { return false_; }
/// @returns the false block
const ir::Block* False() const { return false_; }
/// @param block the new false block
void SetFalse(ir::Block* block);
/// @returns the friendly name for the instruction
std::string FriendlyName() const override { return "if"; }
private:
ConstPropagatingPtr<ir::Block> true_;
ConstPropagatingPtr<ir::Block> false_;
};
} // namespace tint::core::ir
#endif // SRC_TINT_LANG_CORE_IR_IF_H_