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24 
25 package sun.jvm.hotspot.types.basic;
26 
27 import sun.jvm.hotspot.debugger.*;
28 import sun.jvm.hotspot.types.*;
29 
30 /** This interface is designed to allow a platform-specific
31     implementation of the TypeDataBase.isOfType() method, while
32     leaving the rest of the basic.* package platform independent. */
33 
34 public interface VtblAccess {
35   /** This is the necessarily platform-specific implementation.
36       Attempt to return the address of the vtbl for the given
37       polymorphic C++ type. This value will be used when searching
38       nearby memory to implement isOfType() in as platform-independent
39       a manner as possible. Returns null if this value was not
40       available for the given type, which might indicate that the type
41       was not polymorphic or that an error occurred while trying to
42       find the symbol. Note that this method does not support multiple
43       inheritance. */
getVtblForType(Type type)44   public Address getVtblForType(Type type);
45 
46   /** Clear any cached values from symbol lookups in the target
47       process. It is important that this mechanism be fast and for
48       that reason the default implementation memoizes type-to-vtbl
49       mappings. However, if the target process is resumed, these
50       mappings may become invalid. */
clearCaches()51   public void clearCaches();
52 }
53