Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h

/*
 * Copyright (C) 2019 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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 */

#pragma once

#if ENABLE(WEBGPU)

#include "WHLSLExpression.h"
#include "WHLSLLexer.h"
#include "WHLSLQualifier.h"
#include "WHLSLSemantic.h"
#include "WHLSLType.h"
#include "WHLSLValue.h"
#include <memory>
#include <wtf/UniqueRef.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

namespace WHLSL {

namespace AST {

class VariableDeclaration : public Value {
    using Base = Value;
public:
    VariableDeclaration(Lexer::Token&& origin, Qualifiers&& qualifiers, Optional<UniqueRef<UnnamedType>>&& type, String&& name, Optional<Semantic>&& semantic, Optional<UniqueRef<Expression>>&& initializer)
        : Base(WTFMove(origin))
        , m_qualifiers(WTFMove(qualifiers))
        , m_type(WTFMove(type))
        , m_name(WTFMove(name))
        , m_semantic(WTFMove(semantic))
        , m_initializer(WTFMove(initializer))
    {
    }

    virtual ~VariableDeclaration() = default;

    VariableDeclaration(const VariableDeclaration&) = delete;
    VariableDeclaration(VariableDeclaration&&) = default;

    String& name() { return m_name; }

    // We use this for ReadModifyWrite expressions, since we don't know the type of their
    // internal variables until the checker runs. All other variables should start life out
    // with a type.
    void setType(UniqueRef<UnnamedType> type)
    {
        ASSERT(!m_type);
        m_type = WTFMove(type);
    }
    const Optional<UniqueRef<UnnamedType>>& type() const { return m_type; }
    UnnamedType* type() { return m_type ? &*m_type : nullptr; }
    Optional<Semantic>& semantic() { return m_semantic; }
    Expression* initializer() { return m_initializer ? &*m_initializer : nullptr; }
    bool isAnonymous() const { return m_name.isNull(); }
    Optional<UniqueRef<Expression>> takeInitializer() { return WTFMove(m_initializer); }
    void setInitializer(UniqueRef<Expression> expression)
    {
        ASSERT(!initializer());
        m_initializer = WTFMove(expression);
    }

private:
    Qualifiers m_qualifiers;
    Optional<UniqueRef<UnnamedType>> m_type;
    String m_name;
    Optional<Semantic> m_semantic;
    Optional<UniqueRef<Expression>> m_initializer;
};

using VariableDeclarations = Vector<UniqueRef<VariableDeclaration>>;

} // namespace AST

}

}

#endif