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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/globals.h"
#include "vm/growable_array.h"
namespace dart {
// Forward declarations.
class Isolate;
class RawObject;
class RawFunction;
// An object pointer visitor interface.
class ObjectPointerVisitor {
public:
explicit ObjectPointerVisitor(Isolate* isolate) : isolate_(isolate) {}
virtual ~ObjectPointerVisitor() {}
Isolate* isolate() const { return isolate_; }
// Range of pointers to visit 'first' <= pointer <= 'last'.
virtual void VisitPointers(RawObject** first, RawObject** last) = 0;
virtual bool visit_function_code() const { return true; }
virtual void add_skipped_code_function(RawFunction* funct) { UNREACHABLE(); }
// len argument is the number of pointers to visit starting from 'p'.
void VisitPointers(RawObject** p, intptr_t len) {
VisitPointers(p, (p + len - 1));
}
void VisitPointer(RawObject** p) { VisitPointers(p, p); }
private:
Isolate* isolate_;
DISALLOW_IMPLICIT_CONSTRUCTORS(ObjectPointerVisitor);
};
// An object visitor interface.
class ObjectVisitor {
public:
ObjectVisitor() {}
virtual ~ObjectVisitor() {}
// Invoked for each object.
virtual void VisitObject(RawObject* obj) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(ObjectVisitor);
};
class ExtensibleObjectVisitor : public ObjectVisitor {
public:
explicit ExtensibleObjectVisitor(GrowableArray<ObjectVisitor*>* visitors)
: visitors_(visitors) {}
virtual ~ExtensibleObjectVisitor() {}
virtual void VisitObject(RawObject* obj) {
for (intptr_t i = 0; i < visitors_->length(); i++) {
visitors_->At(i)->VisitObject(obj);
}
}
void Add(ObjectVisitor* visitor) { visitors_->Add(visitor); }
private:
GrowableArray<ObjectVisitor*>* visitors_;
DISALLOW_COPY_AND_ASSIGN(ExtensibleObjectVisitor);
};
// 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(RawObject* obj) const = 0;
private:
DISALLOW_COPY_AND_ASSIGN(FindObjectVisitor);
};
} // namespace dart
#endif // RUNTIME_VM_VISITOR_H_