179 lines
6.0 KiB
C++
179 lines
6.0 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_SEM_STATEMENT_H_
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#define SRC_TINT_SEM_STATEMENT_H_
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#include "src/tint/sem/behavior.h"
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#include "src/tint/sem/node.h"
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// Forward declarations
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namespace tint::ast {
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class Statement;
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} // namespace tint::ast
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namespace tint::sem {
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class BlockStatement;
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class CompoundStatement;
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class Function;
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} // namespace tint::sem
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namespace tint::sem {
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namespace detail {
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/// FindFirstParentReturn is a traits helper for determining the return type for
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/// the template member function Statement::FindFirstParent().
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/// For zero or multiple template arguments, FindFirstParentReturn::type
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/// resolves to CompoundStatement.
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template <typename... TYPES>
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struct FindFirstParentReturn {
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/// The pointer type returned by Statement::FindFirstParent()
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using type = CompoundStatement;
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};
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/// A specialization of FindFirstParentReturn for a single template argument.
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/// FindFirstParentReturn::type resolves to the single template argument.
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template <typename T>
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struct FindFirstParentReturn<T> {
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/// The pointer type returned by Statement::FindFirstParent()
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using type = T;
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};
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template <typename... TYPES>
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using FindFirstParentReturnType = typename FindFirstParentReturn<TYPES...>::type;
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} // namespace detail
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/// Statement holds the semantic information for a statement.
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class Statement : public Castable<Statement, Node> {
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public:
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/// Constructor
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/// @param declaration the AST node for this statement
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/// @param parent the owning statement
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/// @param function the owning function
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Statement(const ast::Statement* declaration,
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const CompoundStatement* parent,
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const sem::Function* function);
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/// Destructor
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~Statement() override;
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/// @return the AST node for this statement
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const ast::Statement* Declaration() const { return declaration_; }
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/// @return the statement that encloses this statement
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const CompoundStatement* Parent() const { return parent_; }
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/// @returns the closest enclosing parent that satisfies the given predicate,
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/// which may be the statement itself, or nullptr if no match is found.
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/// @param pred a predicate that the resulting block must satisfy
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template <typename Pred>
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const CompoundStatement* FindFirstParent(Pred&& pred) const;
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/// @returns the closest enclosing parent that is of one of the types in
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/// `TYPES`, which may be the statement itself, or nullptr if no match is
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/// found. If `TYPES` is a single template argument, the return type is a
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/// pointer to that template argument type, otherwise a CompoundStatement
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/// pointer is returned.
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template <typename... TYPES>
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const detail::FindFirstParentReturnType<TYPES...>* FindFirstParent() const;
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/// @return the closest enclosing block for this statement
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const BlockStatement* Block() const;
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/// @returns the function that owns this statement
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const sem::Function* Function() const { return function_; }
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/// @return the behaviors of this statement
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const sem::Behaviors& Behaviors() const { return behaviors_; }
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/// @return the behaviors of this statement
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sem::Behaviors& Behaviors() { return behaviors_; }
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/// @returns true if this statement is reachable by control flow according to
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/// the behavior analysis
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bool IsReachable() const { return is_reachable_; }
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/// @param is_reachable whether this statement is reachable by control flow
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/// according to the behavior analysis
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void SetIsReachable(bool is_reachable) { is_reachable_ = is_reachable; }
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private:
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const ast::Statement* const declaration_;
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const CompoundStatement* const parent_;
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const sem::Function* const function_;
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sem::Behaviors behaviors_{sem::Behavior::kNext};
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bool is_reachable_ = true;
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};
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/// CompoundStatement is the base class of statements that can hold other
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/// statements.
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class CompoundStatement : public Castable<Statement, Statement> {
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public:
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/// Constructor
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/// @param declaration the AST node for this statement
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/// @param statement the owning statement
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/// @param function the owning function
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CompoundStatement(const ast::Statement* declaration,
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const CompoundStatement* statement,
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const sem::Function* function);
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/// Destructor
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~CompoundStatement() override;
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};
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template <typename Pred>
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const CompoundStatement* Statement::FindFirstParent(Pred&& pred) const {
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if (auto* self = As<CompoundStatement>()) {
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if (pred(self)) {
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return self;
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}
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}
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const auto* curr = parent_;
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while (curr && !pred(curr)) {
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curr = curr->Parent();
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}
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return curr;
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}
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template <typename... TYPES>
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const detail::FindFirstParentReturnType<TYPES...>* Statement::FindFirstParent() const {
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using ReturnType = detail::FindFirstParentReturnType<TYPES...>;
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if (sizeof...(TYPES) == 1) {
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if (auto* p = As<ReturnType>()) {
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return p;
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}
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const auto* curr = parent_;
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while (curr) {
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if (auto* p = curr->As<ReturnType>()) {
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return p;
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}
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curr = curr->Parent();
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}
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} else {
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if (IsAnyOf<TYPES...>()) {
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return As<ReturnType>();
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}
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const auto* curr = parent_;
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while (curr) {
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if (curr->IsAnyOf<TYPES...>()) {
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return curr->As<ReturnType>();
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}
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curr = curr->Parent();
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}
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}
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return nullptr;
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}
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} // namespace tint::sem
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#endif // SRC_TINT_SEM_STATEMENT_H_
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