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/*
* Copyright (C) 2022 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
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ASTAttribute.h"
#include "ASTAttribute.h"
#include "ASTDeclaration.h"
#include "ASTExpression.h"
#include "ASTIdentifier.h"
#include "ASTTypeName.h"
#include "ASTVariableQualifier.h"
namespace WGSL {
class TypeChecker;
struct Type;
namespace AST {
enum class VariableFlavor : uint8_t {
Const,
Let,
Override,
Var,
};
class Variable final : public Declaration {
WGSL_AST_BUILDER_NODE(Variable);
friend TypeChecker;
public:
using Ref = std::reference_wrapper<Variable>;
using List = ReferenceWrapperVector<Variable>;
NodeKind kind() const override;
VariableFlavor flavor() const { return m_flavor; };
VariableFlavor& flavor() { return m_flavor; };
Identifier& name() { return m_name; }
Attribute::List& attributes() { return m_attributes; }
VariableQualifier* maybeQualifier() { return m_qualifier; }
TypeName* maybeTypeName() { return m_type; }
Expression* maybeInitializer() { return m_initializer; }
TypeName* maybeReferenceType() { return m_referenceType; }
const Type* storeType() const
{
if (m_type)
return m_type->resolvedType();
return m_initializer->inferredType();
}
private:
Variable(SourceSpan span, VariableFlavor flavor, Identifier&& name, TypeName::Ptr type, Expression::Ptr initializer)
: Variable(span, flavor, WTFMove(name), { }, type, initializer, { })
{ }
Variable(SourceSpan span, VariableFlavor flavor, Identifier&& name, VariableQualifier::Ptr qualifier, TypeName::Ptr type, Expression::Ptr initializer, Attribute::List&& attributes)
: Declaration(span)
, m_name(WTFMove(name))
, m_attributes(WTFMove(attributes))
, m_qualifier(qualifier)
, m_type(type)
, m_initializer(initializer)
, m_flavor(flavor)
{
ASSERT(m_type || m_initializer);
}
Identifier m_name;
Attribute::List m_attributes;
// Each of the following may be null
// But at least one of type and initializer must be non-null
VariableQualifier::Ptr m_qualifier;
TypeName::Ptr m_type;
Expression::Ptr m_initializer;
VariableFlavor m_flavor;
TypeName::Ptr m_referenceType { nullptr };
};
} // namespace AST
} // namespace WGSL
SPECIALIZE_TYPE_TRAITS_WGSL_AST(Variable)
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