Add debugger functions to inspect objects and classes

runtime/include/dart_debugger_api.h

Index: runtime/include/dart_debugger_api.h
===================================================================
--- runtime/include/dart_debugger_api.h	(revision 3572)
+++ runtime/include/dart_debugger_api.h	(working copy)
@@ -158,4 +158,52 @@
                             intptr_t* line_number);
 
 
+/**
+ * Returns the class object of the given \object.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to the class object.
+ */
+DART_EXPORT Dart_Handle Dart_GetObjClass(Dart_Handle object);
+
+
+/**
+ * Returns the superclass of the given class \cls.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to the class object.
+ */
+DART_EXPORT Dart_Handle Dart_GetSuperclass(Dart_Handle cls);

[siva, 2012/01/26 21:34:08]

Where do you intend to use these two class methods?

Is it to get a dump of the class definition?

[hausner, 2012/01/27 17:19:30]

I'm pretty sure a debugger would like to know what the class of an object is, so
it can annotate the variable or field with the type if it wants to. Walking the
superclass chain will be handy in the same way.

+
+
+/**
+ * Returns an array containing all instance field names and values of
+ * the given \object.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to an array containing field names and
+ * corresponding field values. The array is empty if the object has
+ * no fields. If non-empty, field names are at array offsets 2*n,
+ * values at offset 2*n+1.
+ */
+DART_EXPORT Dart_Handle Dart_GetInstanceFields(Dart_Handle object);
+
+
+/**
+ * Returns an array containing all static field names and values of
+ * the given class \cls.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to an array containing field names and
+ * corresponding field values. The array is empty if the class has
+ * no static fields. If non-empty, field names are at array offsets 2*n,
+ * values at offset 2*n+1.
+ */
+DART_EXPORT Dart_Handle Dart_GetStaticFields(Dart_Handle cls);
+
+
 #endif  // INCLUDE_DART_DEBUGGER_API_H_