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// 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_VALUE_H_
#define SRC_TINT_IR_VALUE_H_
#include "src/tint/castable.h"
#include "src/tint/symbol_table.h"
#include "src/tint/type/type.h"
#include "src/tint/utils/string_stream.h"
#include "src/tint/utils/unique_vector.h"
// Forward declarations
namespace tint::ir {
class Instruction;
} // namespace tint::ir
namespace tint::ir {
/// Value in the IR.
class Value : public Castable<Value> {
public:
/// Destructor
~Value() override;
Value(const Value&) = delete;
Value(Value&&) = delete;
Value& operator=(const Value&) = delete;
Value& operator=(Value&&) = delete;
/// Adds an instruction which uses this value.
/// @param instr the instruction
void AddUsage(const Instruction* instr) { uses_.Add(instr); }
/// @returns the vector of instructions which use this value. An instruction will only be
/// returned once even if that instruction uses the given value multiple times.
utils::VectorRef<const Instruction*> Usage() const { return uses_; }
/// @returns the type of the value
virtual const type::Type* Type() const = 0;
/// Write the value to the given stream
/// @param out the stream to write to
/// @param st the symbol table
/// @returns the stream
virtual utils::StringStream& ToString(utils::StringStream& out,
const SymbolTable& st) const = 0;
protected:
/// Constructor
Value();
private:
utils::UniqueVector<const Instruction*, 4> uses_;
};
} // namespace tint::ir
#endif // SRC_TINT_IR_VALUE_H_