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a9156ff091
The semantic nodes cannot be fully immutable, as they contain cyclic references. Remove Resolver::CreateSemanticNodes(), and instead construct and mutate the semantic nodes in the single traversal pass. Give up on trying to maintain the 'authored' type names (aliased names). These are a nightmare to maintain, and provided limited use. Significantly simplfies the Resolver, and allows us to generate more semantic to semantic references, reducing sem -> ast -> sem hops. Note: This change introduces constant value propagation across constant variables. This is unlocked by the earlier construction of the sem::Variable. Change-Id: I592092fdc47fe24d30e512952511c9ab7c16d7a1 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/68406 Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com>
105 lines
3.3 KiB
C++
105 lines
3.3 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_SEM_INFO_H_
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#define SRC_SEM_INFO_H_
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#include <type_traits>
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#include <unordered_map>
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#include "src/debug.h"
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#include "src/sem/node.h"
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#include "src/sem/type_mappings.h"
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namespace tint {
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namespace sem {
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/// Info holds all the resolved semantic information for a Program.
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class Info {
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public:
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/// Placeholder type used by Get() to provide a default value for EXPLICIT_SEM
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using InferFromAST = std::nullptr_t;
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/// Resolves to the return type of the Get() method given the desired sementic
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/// type and AST type.
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template <typename SEM, typename AST_OR_TYPE>
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using GetResultType =
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std::conditional_t<std::is_same<SEM, InferFromAST>::value,
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SemanticNodeTypeFor<AST_OR_TYPE>,
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SEM>;
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/// Constructor
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Info();
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/// Move constructor
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Info(Info&&);
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/// Destructor
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~Info();
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/// Move assignment operator
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/// @param rhs the Program to move
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/// @return this Program
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Info& operator=(Info&& rhs);
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/// Get looks up the semantic information for the AST or type node `node`.
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/// @param node the AST or type node
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/// @returns a pointer to the semantic node if found, otherwise nullptr
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template <typename SEM = InferFromAST,
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typename AST_OR_TYPE = CastableBase,
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typename RESULT = GetResultType<SEM, AST_OR_TYPE>>
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const RESULT* Get(const AST_OR_TYPE* node) const {
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auto it = map.find(node);
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if (it == map.end()) {
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return nullptr;
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}
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return As<RESULT>(it->second);
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}
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/// Add registers the semantic node `sem_node` for the AST or type node
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/// `node`.
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/// @param node the AST or type node
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/// @param sem_node the semantic node
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template <typename AST_OR_TYPE>
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void Add(const AST_OR_TYPE* node,
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const SemanticNodeTypeFor<AST_OR_TYPE>* sem_node) {
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// Check there's no semantic info already existing for the node
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TINT_ASSERT(Semantic, Get(node) == nullptr);
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map.emplace(node, sem_node);
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}
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/// Wrap returns a new Info created with the contents of `inner`.
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/// The Info returned by Wrap is intended to temporarily extend the contents
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/// of an existing immutable Info.
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/// As the copied contents are owned by `inner`, `inner` must not be
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/// destructed or assigned while using the returned Info.
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/// @param inner the immutable Info to extend
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/// @return the Info that wraps `inner`
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static Info Wrap(const Info& inner) {
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Info out;
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out.map = inner.map;
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return out;
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}
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private:
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// TODO(crbug.com/tint/724): Once finished, this map should be:
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// std::unordered_map<const ast::Node*, const sem::Node*>
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std::unordered_map<const CastableBase*, const CastableBase*> map;
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};
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} // namespace sem
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} // namespace tint
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#endif // SRC_SEM_INFO_H_
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