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.
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