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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// -*- mode: C++ -*-
//
// Copyright 2022 Google LLC
//
// Licensed under the Apache License v2.0 with LLVM Exceptions (the
// "License"); you may not use this file except in compliance with the
// License. You may obtain a copy of the License at
//
// https://llvm.org/LICENSE.txt
//
// 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.
//
// Author: Giuliano Procida
#ifndef STG_SUBSTITUTION_H_
#define STG_SUBSTITUTION_H_
#include <map>
#include <vector>
#include "graph.h"
namespace stg {
// This is a single-node node id substitution function that updates all node
// references according to a given mapping. The caller is responsible for
// determining the nodes to which substitution should apply (e.g., excluding
// orphaned nodes).
//
// The caller must provide a reference to a callable object which should update
// its Id argument only when needed (i.e., when the new value is different).
//
// The Update helpers may be used to update external node id references.
template <typename Updater>
struct Substitute {
Substitute(Graph& graph, const Updater& updater)
: graph(graph), updater(updater) {}
void Update(Id& id) const {
updater(id);
}
void Update(std::vector<Id>& ids) const {
for (auto& id : ids) {
Update(id);
}
}
template <typename Key>
void Update(std::map<Key, Id>& ids) const {
for (auto& [key, id] : ids) {
Update(id);
}
}
void operator()(Id id) {
return graph.Apply<void>(*this, id);
}
void operator()(Special&) {}
void operator()(PointerReference& x) {
Update(x.pointee_type_id);
}
void operator()(PointerToMember& x) {
Update(x.containing_type_id);
Update(x.pointee_type_id);
}
void operator()(Typedef& x) {
Update(x.referred_type_id);
}
void operator()(Qualified& x) {
Update(x.qualified_type_id);
}
void operator()(Primitive&) {}
void operator()(Array& x) {
Update(x.element_type_id);
}
void operator()(BaseClass& x) {
Update(x.type_id);
}
void operator()(Method& x) {
Update(x.type_id);
}
void operator()(Member& x) {
Update(x.type_id);
}
void operator()(StructUnion& x) {
if (x.definition.has_value()) {
auto& definition = x.definition.value();
Update(definition.base_classes);
Update(definition.methods);
Update(definition.members);
}
}
void operator()(Enumeration& x) {
if (x.definition.has_value()) {
auto& definition = x.definition.value();
Update(definition.underlying_type_id);
}
}
void operator()(Function& x) {
Update(x.parameters);
Update(x.return_type_id);
}
void operator()(ElfSymbol& x) {
if (x.type_id) {
Update(*x.type_id);
}
}
void operator()(Interface& x) {
Update(x.symbols);
Update(x.types);
}
Graph& graph;
const Updater& updater;
};
template <class Updater>
Substitute(Graph&, const Updater& updater) -> Substitute<decltype(updater)>;
} // namespace stg
#endif // STG_SUBSTITUTION_H_
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