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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_LANG_WGSL_SEM_SWITCH_STATEMENT_H_
#define SRC_TINT_LANG_WGSL_SEM_SWITCH_STATEMENT_H_
#include <vector>
#include "src/tint/lang/wgsl/sem/block_statement.h"
// Forward declarations
namespace tint::ast {
class CaseStatement;
class CaseSelector;
class SwitchStatement;
} // namespace tint::ast
namespace tint::constant {
class Value;
} // namespace tint::constant
namespace tint::sem {
class CaseStatement;
class CaseSelector;
class ValueExpression;
} // namespace tint::sem
namespace tint::sem {
/// Holds semantic information about an switch statement
class SwitchStatement final : public Castable<SwitchStatement, CompoundStatement> {
public:
/// Constructor
/// @param declaration the AST node for this switch statement
/// @param parent the owning statement
/// @param function the owning function
SwitchStatement(const ast::SwitchStatement* declaration,
const CompoundStatement* parent,
const sem::Function* function);
/// Destructor
~SwitchStatement() override;
/// @return the AST node for this statement
const ast::SwitchStatement* Declaration() const;
/// @returns the case statements for this switch
std::vector<const CaseStatement*>& Cases() { return cases_; }
/// @returns the case statements for this switch
const std::vector<const CaseStatement*>& Cases() const { return cases_; }
private:
std::vector<const CaseStatement*> cases_;
};
/// Holds semantic information about a switch case statement
class CaseStatement final : public Castable<CaseStatement, CompoundStatement> {
public:
/// Constructor
/// @param declaration the AST node for this case statement
/// @param parent the owning statement
/// @param function the owning function
CaseStatement(const ast::CaseStatement* declaration,
const CompoundStatement* parent,
const sem::Function* function);
/// Destructor
~CaseStatement() override;
/// @return the AST node for this statement
const ast::CaseStatement* Declaration() const;
/// @param body the case body block statement
void SetBlock(const BlockStatement* body) { body_ = body; }
/// @returns the case body block statement
const BlockStatement* Body() const { return body_; }
/// @returns the selectors for the case
std::vector<const CaseSelector*>& Selectors() { return selectors_; }
/// @returns the selectors for the case
const std::vector<const CaseSelector*>& Selectors() const { return selectors_; }
private:
const BlockStatement* body_ = nullptr;
std::vector<const CaseSelector*> selectors_;
};
/// Holds semantic information about a switch case selector
class CaseSelector final : public Castable<CaseSelector, Node> {
public:
/// Constructor
/// @param decl the selector declaration
/// @param val the case selector value, nullptr for a default selector
explicit CaseSelector(const ast::CaseSelector* decl, const constant::Value* val = nullptr);
/// Destructor
~CaseSelector() override;
/// @returns true if this is a default selector
bool IsDefault() const { return val_ == nullptr; }
/// @returns the case selector declaration
const ast::CaseSelector* Declaration() const;
/// @returns the selector constant value, or nullptr if this is the default selector
const constant::Value* Value() const { return val_; }
private:
const ast::CaseSelector* const decl_;
const constant::Value* const val_;
};
} // namespace tint::sem
#endif // SRC_TINT_LANG_WGSL_SEM_SWITCH_STATEMENT_H_