gdb

* varobj.h (varobj_update_result_t) <new>: New field.
	(varobj_get_child_range, varobj_set_child_range): Declare.
	(varobj_list_children): Update.
	(varobj_enable_pretty_printing, varobj_has_more)
	(varobj_pretty_printed_p): Declare.
	* varobj.c (pretty_printing): New global.
	(varobj_enable_pretty_printing): New function.
	(struct varobj_root) <from, to, constructor, child_iter,
	saved_item>: New fields.
	(varobj_create): Don't call install_default_visualizer.
	(instantiate_pretty_printer): Don't use value_copy.
	(varobj_has_more): New function.
	(restrict_range): New function.
	(install_dynamic_child): Likewise.
	(dynamic_varobj_has_child_method): Likewise.
	(update_dynamic_varobj_children): Remove 'new_and_unchanged'
	argument; add 'new', 'unchanged', 'from', and 'to' arguments.
	Rewrite.
	(varobj_get_num_children): Call update_dynamic_varobj_children.
	(varobj_list_children): Add 'from' and 'to' arguments.  Ignore
	result of update_dynamic_varobj_children.  Don't call
	install_default_visualizer.  Restrict result range.
	(varobj_add_child): Don't call install_default_visualizer.
	(varobj_pretty_printed_p): New function.
	(install_visualizer): Rewrite.  Move earlier in file.
	(install_default_visualizer): Likewise.
	(construct_visualizer): New function.
	(install_new_value_visualizer): Likewise.
	(install_new_value): Don't call release_value.  Special case
	pretty-printed objects.  Use value_incref.  Rearrange "changed"
	logic.
	(varobj_get_child_range): New function.
	(varobj_set_child_range): Likewise.
	(varobj_set_visualizer): Rewrite.
	(varobj_update): Rewrite pretty-printing logic.
	(new_variable): Initialize new fields.
	(free_variable): Destroy new fields.
	(value_of_root): Copy 'from' and 'to'.
	(my_value_of_variable): Handle pretty-printers.
	(value_get_print_value): Rework pretty-printing logic.
	(cplus_describe_child): Don't use release_value.
	* mi/mi-cmds.h (mi_cmd_enable_pretty_printing)
	(mi_cmd_var_set_update_range): Declare.
	* mi/mi-cmds.c (mi_cmds): Add enable-pretty-printing and
	var-set-update-range.
	* mi/mi-cmd-var.c (print_varobj): Update.  Emit "dynamic"
	attribute.
	(mi_cmd_var_create): Emit "has_more" attribute.
	(mi_cmd_var_set_format): Plug memory leak.
	(mi_print_value_p): Replace 'type' argument with 'var'.  Handle
	pretty-printed varobjs.
	(mi_cmd_var_list_children): Accept 'from' and 'to' arguments.
	Emit "has_more" attribute.
	(mi_cmd_var_evaluate_expression): Plug memory leak.
	(mi_cmd_var_assign): Likewise.
	(varobj_update_one): Likewise.  Emit "dynamic", "has_more", and
	"new_children" attributes.
	(mi_cmd_enable_pretty_printing): New function.
	(mi_cmd_var_set_update_range): Likewise.
gdb/doc
	* gdb.texinfo (GDB/MI Variable Objects): Document
	-enable-pretty-printing, -var-set-update-range, dynamic varobjs.
	Expand -var-update documentation.
gdb/testsuite
	* lib/mi-support.exp (mi_create_varobj): Update.
	(mi_create_floating_varobj): Likewise.
	(mi_create_dynamic_varobj): New proc.
	(mi_varobj_update): Update.
	(mi_varobj_update_with_type_change): Likewise.
	(mi_varobj_update_kv_helper): New proc.
	(mi_varobj_update_dynamic_helper): Rewrite.
	(mi_varobj_update_dynamic): New proc.
	(mi_list_varobj_children): Update.
	(mi_list_varobj_children_range): Add 'from' and 'to' arguments.
	* gdb.python/python-prettyprint.py (pp_outer): New class.
	(pp_nullstr): Likewise.
	(lookup_function): Register new printers.
	* gdb.python/python-prettyprint.c (struct substruct): New type.
	(struct outerstruct): Likewise.
	(substruct_test): New function.
	(struct nullstr): New type.
	(string_1, string_2): New globals.
	(main): Add new tests.
	* gdb.python/python-mi.exp: Added regression tests.
	* gdb.mi/mi2-var-display.exp: Update.
	* gdb.mi/mi2-var-cmd.exp: Update.
	* gdb.mi/mi2-var-child.exp: Update.
	* gdb.mi/mi2-var-block.exp: Update.
	* gdb.mi/mi-var-invalidate.exp: Update.
	* gdb.mi/mi-var-display.exp: Update.
	* gdb.mi/mi-var-cmd.exp: Update.
	* gdb.mi/mi-var-child.exp: Update.
	* gdb.mi/mi-var-block.exp: Update.
	* gdb.mi/mi-break.exp: Update.
	* gdb.mi/gdb701.exp: Update.

gdb/testsuite/gdb.python/py-prettyprint.py

@@ -92,6 +92,13 @@ class pp_vbase1:
     def to_string (self):
         return "pp class name: " + self.val.type.tag
 
+class pp_nullstr:
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        return self.val['s'].string(gdb.parameter('target-charset'))
+
 class pp_ns:
     "Print a std::basic_string of some kind"
 
@@ -105,11 +112,24 @@ class pp_ns:
     def display_hint (self):
         return 'string'
 
+class pp_outer:
+    "Print struct outer"
+
+    def __init__ (self, val):
+        self.val = val
+
+    def to_string (self):
+        return "x = %s" % self.val['x']
+
+    def children (self):
+        yield 's', self.val['s']
+        yield 'x', self.val['x']
+
 def lookup_function (val):
     "Look-up and return a pretty-printer that can print val."
 
     # Get the type.
-    type = val.type;
+    type = val.type
 
     # If it points to a reference, get the reference.
     if type.code == gdb.TYPE_CODE_REF:
@@ -148,6 +168,9 @@ def register_pretty_printers ():
     
     pretty_printers_dict[re.compile ('^VirtualTest$')] =  pp_multiple_virtual
     pretty_printers_dict[re.compile ('^Vbase1$')] =  pp_vbase1
+
+    pretty_printers_dict[re.compile ('^struct nullstr$')] = pp_nullstr
+    pretty_printers_dict[re.compile ('^nullstr$')] = pp_nullstr
     
     # Note that we purposely omit the typedef names here.
     # Printer lookup is based on canonical name.
@@ -160,6 +183,10 @@ def register_pretty_printers ():
     
     pretty_printers_dict[re.compile ('^struct ns$')]  = pp_ns
     pretty_printers_dict[re.compile ('^ns$')]  = pp_ns
+
+    pretty_printers_dict[re.compile ('^struct outerstruct$')]  = pp_outer
+    pretty_printers_dict[re.compile ('^outerstruct$')]  = pp_outer
+
 pretty_printers_dict = {}
 
 register_pretty_printers ()