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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TOOLS_CLANG_BLINK_GC_PLUGIN_CHECKFORBIDDENFIELDSVISITOR_H_
#define TOOLS_CLANG_BLINK_GC_PLUGIN_CHECKFORBIDDENFIELDSVISITOR_H_
#include <set>
#include <vector>
#include "Edge.h"
#include "RecordInfo.h"
// This visitor checks that the fields of a class and the fields of
// its embedded objects don't define GC roots.
class CheckForbiddenFieldsVisitor : public RecursiveEdgeVisitor {
public:
enum class Error {
kTaskRunnerInGCManaged,
kMojoRemoteInGCManaged,
kMojoReceiverInGCManaged,
kMojoAssociatedRemoteInGCManaged,
kMojoAssociatedReceiverInGCManaged,
};
using RootPath = std::vector<FieldPoint*>;
using VisitingSet = std::set<RecordInfo*>;
using Errors = std::vector<std::pair<RootPath, Error>>;
explicit CheckForbiddenFieldsVisitor();
// The forbidden fields found across the call(s) to
// `ContainsForbiddenFields`.
Errors& forbidden_fields();
// Checks whether the record recursively contains forbidden fields (either the
// record itself or an embedded object).
// Returns whether forbidden fields were found.
bool ContainsForbiddenFields(RecordInfo* info);
void VisitValue(Value* edge) override;
void VisitArrayEdge(ArrayEdge* edge) override;
private:
bool ContainsForbiddenFieldsInternal(RecordInfo* info);
bool ContainsInvalidFieldTypes(Value* edge);
// The current path that we are working on.
// This permits to find the path back to the GCed type when handling embedded
// objects.
RootPath current_;
// The currently visited nodes. This is used to handle cyclic dependencies
// between the embedded objects we are going through.
VisitingSet visiting_set_;
// The actual fields that were found while inspecting the record.
Errors forbidden_fields_;
};
#endif // TOOLS_CLANG_BLINK_GC_PLUGIN_CHECKFORBIDDENFIELDSVISITOR_H_
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