Abstraction for HEAP.

Heap_Control Abstraction is added. It will need some more grooming
though.

tools/gdb/python/heaps.py

@@ -0,0 +1,62 @@
+#
+# RTEMS heap
+#
+
+class block:
+    '''Abstract a heap block structure'''
+
+    def __init__(self, blk):
+        self.block = blk
+        self.prev_size = self.block['prev_size']
+        self.size_flag = self.block['size_and_flag']
+
+    def null(self):
+        if self.block:
+            return False
+        return True
+
+
+    def next(self):
+        if not self.null():
+            self.block = self.block['next']
+
+    def prev(self):
+        if not self.null():
+            self.block = self.block['prev']
+
+class stats:
+    ''heap statistics''
+
+    def __init__(self,stat):
+        self.stat = stat
+
+    def avail(self):
+        val = self.stat['size']
+        return val
+
+    def free(self):
+        return self.stat['free_size']
+
+    # ToDo : incorporate others
+
+def control:
+    '''Abstract a heap control structure'''
+
+    def __init__(self, ctl):
+        self.ctl = ctl
+
+    def first(self):
+        b = block(self.ctl['first_block'])
+        return b
+
+    def last(self):
+        b = block(self.ctl['last_block'])
+        return b
+
+    def free(self):
+        b = block(self.ctl['free_list'])
+        return b
+
+    def stat(self):
+        st = stats(self.ctl['stats'])
+        return st