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// Copyright 2021 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_SEM_MEMBER_ACCESSOR_EXPRESSION_H_
#define SRC_TINT_SEM_MEMBER_ACCESSOR_EXPRESSION_H_
#include "src/tint/sem/value_expression.h"
#include "src/tint/utils/vector.h"
// Forward declarations
namespace tint::ast {
class MemberAccessorExpression;
} // namespace tint::ast
namespace tint::type {
class StructMember;
} // namespace tint::type
namespace tint::sem {
/// MemberAccessorExpression holds the semantic information for a
/// ast::MemberAccessorExpression node.
class MemberAccessorExpression : public utils::Castable<MemberAccessorExpression, ValueExpression> {
public:
/// Destructor
~MemberAccessorExpression() override;
/// @returns the object that holds the member being accessed
const ValueExpression* Object() const { return object_; }
protected:
/// Constructor
/// @param declaration the AST node
/// @param type the resolved type of the expression
/// @param stage the earliest evaluation stage for the expression
/// @param statement the statement that owns this expression
/// @param constant the constant value of the expression. May be null.
/// @param object the object that holds the member being accessed
/// @param has_side_effects whether this expression may have side effects
/// @param root_ident the (optional) root identifier for this expression
MemberAccessorExpression(const ast::MemberAccessorExpression* declaration,
const type::Type* type,
EvaluationStage stage,
const Statement* statement,
const constant::Value* constant,
const ValueExpression* object,
bool has_side_effects,
const Variable* root_ident = nullptr);
private:
ValueExpression const* const object_;
};
/// StructMemberAccess holds the semantic information for a
/// ast::MemberAccessorExpression node that represents an access to a structure
/// member.
class StructMemberAccess final
: public utils::Castable<StructMemberAccess, MemberAccessorExpression> {
public:
/// Constructor
/// @param declaration the AST node
/// @param type the resolved type of the expression
/// @param statement the statement that owns this expression
/// @param constant the constant value of the expression. May be null
/// @param object the object that holds the member being accessed
/// @param member the structure member
/// @param has_side_effects whether this expression may have side effects
/// @param root_ident the (optional) root identifier for this expression
StructMemberAccess(const ast::MemberAccessorExpression* declaration,
const type::Type* type,
const Statement* statement,
const constant::Value* constant,
const ValueExpression* object,
const type::StructMember* member,
bool has_side_effects,
const Variable* root_ident = nullptr);
/// Destructor
~StructMemberAccess() override;
/// @returns the structure member
type::StructMember const* Member() const { return member_; }
private:
type::StructMember const* const member_;
};
/// Swizzle holds the semantic information for a ast::MemberAccessorExpression
/// node that represents a vector swizzle.
class Swizzle final : public utils::Castable<Swizzle, MemberAccessorExpression> {
public:
/// Constructor
/// @param declaration the AST node
/// @param type the resolved type of the expression
/// @param statement the statement that owns this expression
/// @param constant the constant value of the expression. May be null
/// @param object the object that holds the member being accessed
/// @param indices the swizzle indices
/// @param has_side_effects whether this expression may have side effects
/// @param root_ident the (optional) root identifier for this expression
Swizzle(const ast::MemberAccessorExpression* declaration,
const type::Type* type,
const Statement* statement,
const constant::Value* constant,
const ValueExpression* object,
utils::VectorRef<uint32_t> indices,
bool has_side_effects,
const Variable* root_ident = nullptr);
/// Destructor
~Swizzle() override;
/// @return the swizzle indices, if this is a vector swizzle
const auto& Indices() const { return indices_; }
private:
utils::Vector<uint32_t, 4> const indices_;
};
} // namespace tint::sem
#endif // SRC_TINT_SEM_MEMBER_ACCESSOR_EXPRESSION_H_