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// Copyright 2022 The Dawn & Tint Authors
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#ifndef SRC_TINT_LANG_CORE_IR_INSTRUCTION_H_
#define SRC_TINT_LANG_CORE_IR_INSTRUCTION_H_
#include <string>
#include "src/tint/lang/core/ir/instruction_result.h"
#include "src/tint/lang/core/ir/value.h"
#include "src/tint/utils/containers/const_propagating_ptr.h"
#include "src/tint/utils/containers/enum_set.h"
#include "src/tint/utils/rtti/castable.h"
// Forward declarations
namespace tint::core::ir {
class Block;
class CloneContext;
} // namespace tint::core::ir
namespace tint::core::ir {
/// An instruction in the IR.
class Instruction : public Castable<Instruction> {
public:
/// Destructor
~Instruction() override;
/// Set an operand at a given index.
/// @param index the operand index
/// @param value the value to use
virtual void SetOperand(size_t index, ir::Value* value) = 0;
/// @returns the operands of the instruction
virtual VectorRef<ir::Value*> Operands() = 0;
/// @returns the operands of the instruction
virtual VectorRef<const ir::Value*> Operands() const = 0;
/// @returns the result values for this instruction
virtual VectorRef<InstructionResult*> Results() = 0;
/// @returns the result values for this instruction
virtual VectorRef<const InstructionResult*> Results() const = 0;
/// Removes the instruction from the block, and destroys all the result values.
/// The result values must not be in use.
virtual void Destroy();
/// @returns the friendly name for the instruction
virtual std::string FriendlyName() const = 0;
/// @param ctx the CloneContext used to clone this instruction
/// @returns a clone of this instruction
virtual Instruction* Clone(CloneContext& ctx) = 0;
/// @returns true if the Instruction has not been destroyed with Destroy()
bool Alive() const { return !flags_.Contains(Flag::kDead); }
/// @returns true if the Instruction is sequenced. Sequenced instructions cannot be implicitly
/// reordered with other sequenced instructions.
bool Sequenced() const { return flags_.Contains(Flag::kSequenced); }
/// Sets the block that owns this instruction
/// @param block the new owner block
void SetBlock(ir::Block* block) { block_ = block; }
/// @returns the block that owns this instruction
ir::Block* Block() { return block_; }
/// @returns the block that owns this instruction
const ir::Block* Block() const { return block_; }
/// Adds the new instruction before the given instruction in the owning block
/// @param before the instruction to insert before
void InsertBefore(Instruction* before);
/// Adds the new instruction after the given instruction in the owning block
/// @param after the instruction to insert after
void InsertAfter(Instruction* after);
/// Replaces this instruction with @p replacement in the owning block owning this instruction
/// @param replacement the instruction to replace with
void ReplaceWith(Instruction* replacement);
/// Removes this instruction from the owning block
void Remove();
/// @param idx the index of the operand
/// @returns the operand with index @p idx, or `nullptr` if there are no operands or the index
/// is out of bounds.
Value* Operand(size_t idx) {
auto res = Operands();
return idx < res.Length() ? res[idx] : nullptr;
}
/// @param idx the index of the operand
/// @returns the operand with index @p idx, or `nullptr` if there are no operands or the index
/// is out of bounds.
const Value* Operand(size_t idx) const {
auto res = Operands();
return idx < res.Length() ? res[idx] : nullptr;
}
/// @param idx the index of the result
/// @returns the result with index @p idx, or `nullptr` if there are no results or the index is
/// out of bounds.
InstructionResult* Result(size_t idx) {
auto res = Results();
return idx < res.Length() ? res[idx] : nullptr;
}
/// @param idx the index of the result
/// @returns the result with index @p idx, or `nullptr` if there are no results or the index is
/// out of bounds.
const InstructionResult* Result(size_t idx) const {
auto res = Results();
return idx < res.Length() ? res[idx] : nullptr;
}
/// Pointer to the next instruction in the list
ConstPropagatingPtr<Instruction> next;
/// Pointer to the previous instruction in the list
ConstPropagatingPtr<Instruction> prev;
protected:
/// Flags applied to an Instruction
enum class Flag {
/// The instruction has been destroyed
kDead,
/// The instruction must not be reordered with another sequenced instruction
kSequenced,
};
/// Constructor
Instruction();
/// The block that owns this instruction
ConstPropagatingPtr<ir::Block> block_;
/// Bitset of instruction flags
tint::EnumSet<Flag> flags_;
};
} // namespace tint::core::ir
#endif // SRC_TINT_LANG_CORE_IR_INSTRUCTION_H_