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// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_VISITOR_H_
#define RUNTIME_VM_VISITOR_H_
#include "vm/allocation.h"
#include "vm/class_table.h"
#include "vm/globals.h"
#include "vm/growable_array.h"
namespace dart {
// Forward declarations.
class Isolate;
class IsolateGroup;
// An object pointer visitor interface.
class ObjectPointerVisitor {
public:
explicit ObjectPointerVisitor(IsolateGroup* isolate_group);
virtual ~ObjectPointerVisitor() {}
IsolateGroup* isolate_group() const { return isolate_group_; }
// Visit pointers inside the given typed data [view].
//
// Range of pointers to visit 'first' <= pointer <= 'last'.
virtual void VisitTypedDataViewPointers(TypedDataViewPtr view,
ObjectPtr* first,
ObjectPtr* last) {
VisitPointers(first, last);
}
// Range of pointers to visit 'first' <= pointer <= 'last'.
virtual void VisitPointers(ObjectPtr* first, ObjectPtr* last) = 0;
// len argument is the number of pointers to visit starting from 'p'.
void VisitPointers(ObjectPtr* p, intptr_t len) {
VisitPointers(p, (p + len - 1));
}
void VisitPointer(ObjectPtr* p) { VisitPointers(p, p); }
const char* gc_root_type() const { return gc_root_type_; }
void set_gc_root_type(const char* gc_root_type) {
gc_root_type_ = gc_root_type;
}
void clear_gc_root_type() { gc_root_type_ = "unknown"; }
virtual bool visit_weak_persistent_handles() const { return false; }
const SharedClassTable* shared_class_table() const {
return shared_class_table_;
}
private:
IsolateGroup* isolate_group_;
const char* gc_root_type_;
SharedClassTable* shared_class_table_;
DISALLOW_IMPLICIT_CONSTRUCTORS(ObjectPointerVisitor);
};
// An object visitor interface.
class ObjectVisitor {
public:
ObjectVisitor() {}
virtual ~ObjectVisitor() {}
// Invoked for each object.
virtual void VisitObject(ObjectPtr obj) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(ObjectVisitor);
};
// An object finder visitor interface.
class FindObjectVisitor {
public:
FindObjectVisitor() {}
virtual ~FindObjectVisitor() {}
// Allow to specify a address filter.
virtual uword filter_addr() const { return 0; }
bool VisitRange(uword begin_addr, uword end_addr) const {
uword addr = filter_addr();
return (addr == 0) || ((begin_addr <= addr) && (addr < end_addr));
}
// Check if object matches find condition.
virtual bool FindObject(ObjectPtr obj) const = 0;
private:
DISALLOW_COPY_AND_ASSIGN(FindObjectVisitor);
};
} // namespace dart
#endif // RUNTIME_VM_VISITOR_H_