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// Copyright 2015 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_BLINK_GC_PLUGIN_CHECK_FIELDS_VISITOR_H_
#define TOOLS_BLINK_GC_PLUGIN_CHECK_FIELDS_VISITOR_H_
#include <vector>
#include "BlinkGCPluginOptions.h"
#include "Edge.h"
class FieldPoint;
// This visitor checks that the fields of a class are "well formed".
// - unique_ptr, scoped_refptr and WeakPtr must not point to a GC derived type.
// - Part objects must not be a GC derived type.
// - An on-heap class must never contain GC roots.
// - Only stack-allocated types may point to stack-allocated types.
class CheckFieldsVisitor : public RecursiveEdgeVisitor {
public:
enum Error {
kRawPtrToGCManaged,
kRefPtrToGCManaged,
kReferencePtrToGCManaged,
kUniquePtrToGCManaged,
kMemberToGCUnmanaged,
kMemberInUnmanaged,
kPtrToMemberInUnmanaged,
kPtrFromHeapToStack,
kGCDerivedPartObject,
kIteratorToGCManaged,
kMemberInStackAllocated,
kTraceablePartObjectInUnmanaged,
kRawPtrToTraceable,
kRefPtrToTraceable,
kReferencePtrToTraceable,
kUniquePtrToTraceable,
};
using Errors = std::vector<std::pair<FieldPoint*, Error>>;
explicit CheckFieldsVisitor(const BlinkGCPluginOptions&);
Errors& invalid_fields();
bool ContainsInvalidFields(RecordInfo* info);
void AtMember(Member*) override;
void AtWeakMember(WeakMember*) override;
void AtValue(Value*) override;
void AtCollection(Collection*) override;
void AtIterator(Iterator*) override;
private:
const BlinkGCPluginOptions& options_;
FieldPoint* current_;
bool stack_allocated_host_;
bool managed_host_;
Errors invalid_fields_;
};
#endif // TOOLS_BLINK_GC_PLUGIN_CHECK_FIELDS_VISITOR_H_
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