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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_SEM_BLOCK_STATEMENT_H_
#define SRC_SEM_BLOCK_STATEMENT_H_
#include <cstddef>
#include <vector>
#include "src/sem/statement.h"
// Forward declarations
namespace tint {
namespace ast {
class BlockStatement;
class Function;
class Variable;
} // namespace ast
} // namespace tint
namespace tint {
namespace sem {
/// Holds semantic information about a block, such as parent block and variables
/// declared in the block.
class BlockStatement : public Castable<BlockStatement, CompoundStatement> {
public:
/// Constructor
/// @param declaration the AST node for this block statement
/// @param parent the owning statement
BlockStatement(const ast::BlockStatement* declaration,
const CompoundStatement* parent);
/// Destructor
~BlockStatement() override;
/// @returns the AST block statement associated with this semantic block
/// statement
const ast::BlockStatement* Declaration() const;
/// @returns the declarations associated with this block
const std::vector<const ast::Variable*>& Decls() const { return decls_; }
/// Associates a declaration with this block.
/// @param var a variable declaration to be added to the block
void AddDecl(ast::Variable* var);
private:
std::vector<const ast::Variable*> decls_;
};
/// The root block statement for a function
class FunctionBlockStatement
: public Castable<FunctionBlockStatement, BlockStatement> {
public:
/// Constructor
/// @param function the owning function
explicit FunctionBlockStatement(const ast::Function* function);
/// Destructor
~FunctionBlockStatement() override;
/// @returns the function owning this block
const ast::Function* Function() const { return function_; }
private:
ast::Function const* const function_;
};
/// Holds semantic information about a loop body block or for-loop body block
class LoopBlockStatement : public Castable<LoopBlockStatement, BlockStatement> {
public:
/// Constructor
/// @param declaration the AST node for this block statement
/// @param parent the owning statement
LoopBlockStatement(const ast::BlockStatement* declaration,
const CompoundStatement* parent);
/// Destructor
~LoopBlockStatement() override;
/// @returns the index of the first variable declared after the first continue
/// statement
size_t FirstContinue() const { return first_continue_; }
/// Requires that this is a loop block.
/// Allows the resolver to set the index of the first variable declared after
/// the first continue statement.
/// @param first_continue index of the relevant variable
void SetFirstContinue(size_t first_continue);
private:
// first_continue is set to the index of the first variable in decls
// declared after the first continue statement in a loop block, if any.
constexpr static size_t kNoContinue = size_t(~0);
size_t first_continue_ = kNoContinue;
};
} // namespace sem
} // namespace tint
#endif // SRC_SEM_BLOCK_STATEMENT_H_