Commit graph

7 commits

Author SHA1 Message Date
Simon Marchi
b09e2c591f Constify some parameters in the varobj code
To make it clear that some functions should not modify the variable
object, this patch adds the const qualifier where it makes sense to some
struct varobj * parameters. Most getters should take a const pointer to
guarantee they don't modify the object.

Unfortunately, I couldn't add it to some callbacks (such as name_of_child).
In the C implementation, they call c_describe_child, which calls
varobj_get_path_expr. varobj_get_path_expr needs to modify the object in
order to cache the computed value. It therefore can't take a const
pointer, and it affects the whole call chain. I suppose that's where you
would use a "mutable" in C++.

I did that to make sure there was no other cases like the one fixed in
the previous patch. I don't think it can hurt.

gdb/ChangeLog:

	* ada-varobj.c (ada_number_of_children): Constify struct varobj *
	parameter.
	(ada_name_of_variable): Same.
	(ada_path_expr_of_child): Same.
	(ada_value_of_variable): Same.
	(ada_value_is_changeable_p): Same.
	(ada_value_has_mutated): Same.
	* c-varobj.c (varobj_is_anonymous_child): Same.
	(c_is_path_expr_parent): Same.
	(c_number_of_children): Same.
	(c_name_of_variable): Same.
	(c_path_expr_of_child): Same.
	(get_type): Same.
	(c_value_of_variable): Same.
	(cplus_number_of_children): Same.
	(cplus_name_of_variable): Same.
	(cplus_path_expr_of_child): Same.
	(cplus_value_of_variable): Same.
	* jv-varobj.c (java_number_of_children): Same.
	(java_name_of_variable): Same.
	(java_path_expr_of_child): Same.
	(java_value_of_variable): Same.
	* varobj.c (number_of_children): Same.
	(name_of_variable): Same.
	(is_root_p): Same.
	(varobj_ensure_python_env): Same.
	(varobj_get_objname): Same.
	(varobj_get_expression): Same.
	(varobj_get_display_format): Same.
	(varobj_get_display_hint): Same.
	(varobj_has_more): Same.
	(varobj_get_thread_id): Same.
	(varobj_get_frozen): Same.
	(dynamic_varobj_has_child_method): Same.
	(varobj_get_gdb_type): Same.
	(is_path_expr_parent): Same.
	(varobj_default_is_path_expr_parent): Same.
	(varobj_get_language): Same.
	(varobj_get_attributes): Same.
	(varobj_is_dynamic_p): Same.
	(varobj_get_child_range): Same.
	(varobj_value_has_mutated): Same.
	(varobj_get_value_type): Same.
	(number_of_children): Same.
	(name_of_variable): Same.
	(check_scope): Same.
	(varobj_editable_p): Same.
	(varobj_value_is_changeable_p): Same.
	(varobj_floating_p): Same.
	(varobj_default_value_is_changeable_p): Same.
	* varobj.h (struct lang_varobj_ops): Consitfy some struct varobj *
	parameters.
	(varobj_get_objname): Constify struct varobj * parameter.
	(varobj_get_expression): Same.
	(varobj_get_thread_id): Same.
	(varobj_get_frozen): Same.
	(varobj_get_child_range): Same.
	(varobj_get_display_hint): Same.
	(varobj_get_gdb_type): Same.
	(varobj_get_language): Same.
	(varobj_get_attributes): Same.
	(varobj_editable_p): Same.
	(varobj_floating_p): Same.
	(varobj_has_more): Same.
	(varobj_is_dynamic_p): Same.
	(varobj_ensure_python_env): Same.
	(varobj_default_value_is_changeable_p): Same.
	(varobj_value_is_changeable_p): Same.
	(varobj_get_value_type): Same.
	(varobj_is_anonymous_child): Same.
	(varobj_value_get_print_value): Same.
	(varobj_default_is_path_expr_parent): Same.
2015-01-30 15:07:15 -05:00
Simon Marchi
2568868e69 Set varobj->path_expr in varobj_get_path_expr
It seems like different languages are doing this differently (e.g.
C and Ada). For C, var->path_expr is set inside c_path_expr_of_child.
The next time the value is requested, is it therefore not recomputed.
Ada does not set this field, but just returns the value. Since the field
is never set, the value is recomputed every time it is requested.

This patch makes it so that path_expr_of_child's only job is to compute
the path expression, not save/cache the value. The field is set by the
varobj common code.

gdb/ChangeLog:

	* varobj.c (varobj_get_path_expr): Set var->path_expr.
	* c-varobj.c (c_path_expr_of_child): Set local var instead of
	child->path_expr.
	(cplus_path_expr_of_child): Same.
2015-01-30 14:43:59 -05:00
Joel Brobecker
32d0add0a6 Update year range in copyright notice of all files owned by the GDB project.
gdb/ChangeLog:

        Update year range in copyright notice of all files.
2015-01-01 13:32:14 +04:00
Andrew Burgess
9a9a760829 Improve MI -var-info-path-expression for nested struct/union case.
https://sourceware.org/ml/gdb-patches/2014-05/msg00383.html

The MI command -var-info-path-expression currently does not handle
non-anonymous structs / unions nested within other structs / unions,
it will skip parts of the expression.  Consider this example:

  ## START EXAMPLE ##
  $ cat ex.c
  #include <string.h>

  int
  main ()
  {
    struct s1
    {
      int a;
    };

    struct ss
    {
      struct s1 x;
    };

    struct ss an_ss;
    memset (&an_ss, 0, sizeof (an_ss));
    return 0;
  }
  $ gcc -g -o ex.x ex.c
  $ gdb ex.x
  (gdb) break 18
  Breakpoint 1 at 0x80483ba: file ex.c, line 18.
  (gdb) run
  Starting program: /home/user/ex.x

  Breakpoint 1, main () at ex.c:18
  18	  return 0;
  (gdb) interpreter-exec mi "-var-create an_ss * an_ss"
  (gdb) interpreter-exec mi "-var-list-children an_ss"
  ^done,numchild="1",children=[child={name="an_ss.x",exp="x",numchild="1",type="struct s1",thread-id="1"}],has_more="0"
  (gdb) interpreter-exec mi "-var-list-children an_ss.x"
  ^done,numchild="1",children=[child={name="an_ss.x.a",exp="a",numchild="0",type="int",thread-id="1"}],has_more="0"
  (gdb) interpreter-exec mi "-var-list-children an_ss.x.a"
  ^done,numchild="0",has_more="0"
  (gdb) interpreter-exec mi "-var-info-path-expression an_ss.x.a"
  ^done,path_expr="(an_ss).a"
  (gdb) print (an_ss).a
  There is no member named a.
  ## END EXAMPLE ##

Notice that the path expression returned is wrong, and as a result
the print command fails.

This patch adds a new method to the varobj_ops structure called
is_path_expr_parent, to allow language specific control over finding
the parent varobj, the current logic becomes the C/C++ version and is
extended to handle the nested cases.  No other language currently uses
this code, so all other languages just get a default method.

With this patch, the above example now finishes like this:

  ## START EXAMPLE ##
  $ gdb ex.x
  (gdb) break 18
  Breakpoint 1 at 0x80483ba: file ex.c, line 18.
  (gdb) run
  Starting program: /home/user/ex.x

  Breakpoint 1, main () at ex.c:18
  18	  return 0;
  (gdb) interpreter-exec mi "-var-list-children an_ss"
  ^done,numchild="1",children=[child={name="an_ss.x",exp="x",numchild="1",type="struct s1",thread-id="1"}],has_more="0"
  (gdb) interpreter-exec mi "-var-list-children an_ss.x"
  ^done,numchild="1",children=[child={name="an_ss.x.a",exp="a",numchild="0",type="int",thread-id="1"}],has_more="0"
  (gdb) interpreter-exec mi "-var-list-children an_ss.x.a"
  ^done,numchild="0",has_more="0"
  (gdb) interpreter-exec mi "-var-info-path-expression an_ss.x.a"
  ^done,path_expr="((an_ss).x).a"
  (gdb) print ((an_ss).x).a
  $1 = 0
  ## END EXAMPLE ##

Notice that the path expression is now correct, and the print is a
success.

gdb/ChangeLog:

	* ada-varobj.c (ada_varobj_ops): Fill in is_path_expr_parent
	field.
	* c-varobj.c (c_is_path_expr_parent): New function, moved core
	from varobj.c, with additional checks.
	(c_varobj_ops): Fill in is_path_expr_parent field.
	(cplus_varobj_ops): Fill in is_path_expr_parent field.
	* jv-varobj.c (java_varobj_ops): Fill in is_path_expr_parent
	field.
	* varobj.c (is_path_expr_parent): Call is_path_expr_parent varobj
	ops method.
	(varobj_default_is_path_expr_parent): New function.
	* varobj.h (lang_varobj_ops): Add is_path_expr_parent field.
	(varobj_default_is_path_expr_parent): Declare new function.

gdb/testsuite/ChangeLog:

	* gdb.mi/var-cmd.c (do_nested_struct_union_tests): New function
	setting up test structures.
	(main): Call new test function.
	* gdb.mi/mi2-var-child.exp: Create additional breakpoint in new
	test function, continue into test function and walk test
	structures.
2014-07-09 14:47:47 +01:00
Joel Brobecker
ecd75fc8ee Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
Yao Qi
0c6faab597 gdb/
* c-varobj.c (cplus_number_of_children): Fix indentation.
2013-10-18 02:09:57 +00:00
Yao Qi
99ad94278d gdb/
* Makefile.in (SFILES): Add c-varobj.c and jv-varobj.c.
	(COMMON_OBS): Add c-varobj.o and jv-varobj.o.
	* ada-varobj.c: Include "varobj.h".
	(ada_number_of_children): New.  Moved from varobj.c.
	(ada_name_of_variable, ada_name_of_child): Likewise.
	(ada_path_expr_of_child, ada_value_of_child): Likewise.
	(ada_type_of_child, ada_value_of_variable): Likewise.
	(ada_value_is_changeable_p, ada_value_has_mutated): Likewise.
	(ada_varobj_ops): New.
	* c-varobj.c, jv-varobj.c: New file.  Moved from varobj.c.
	* gdbtypes.c (get_target_type): New.  Moved from varobj.c.
	* gdbtypes.h (get_target_type): Declare.
	* varobj.c: Remove the inclusion of "ada-varobj.h" and
	"ada-lang.h".
	(ANONYMOUS_STRUCT_NAME): Move it to c-varobj.c.
	(ANONYMOUS_UNION_NAME): Likewise.
	(get_type, get_value_type, get_target_type): Remove declarations.
	(value_get_print_value, varobj_value_get_print_value): Likewise.
	(c_number_of_children, c_name_of_variable): Likewise.
	(c_name_of_child, c_path_expr_of_child): Likewise.
	(c_value_of_child, c_type_of_child): Likewise.
	(c_value_of_variable, cplus_number_of_children): Likewise.
	(cplus_class_num_children, cplus_name_of_variable): Likewise.
	(cplus_name_of_child, cplus_path_expr_of_child): Likewise.
	(cplus_value_of_child, cplus_type_of_child): Likewise.
	(cplus_value_of_variable, java_number_of_children): Likewise.
	(java_name_of_variable, java_name_of_child): Likewise.
	(java_path_expr_of_child, java_value_of_child): Likewise.
	(java_type_of_child, java_value_of_variable): Likewise.
	(ada_number_of_children, ada_name_of_variable): Likewise.
	(ada_name_of_child, ada_path_expr_of_child): Likewise.
	(ada_value_of_child, ada_type_of_child): Likewise.
	(ada_value_of_variable, ada_value_is_changeable_p): Likewise.
	(ada_value_has_mutated): Likewise.
	(struct language_specific): Move it to varobj.h.
	(CPLUS_FAKE_CHILD): Move it to varobj.h.
	(restrict_range): Rename it varobj_restrict_range.  Make it extern.
	Callers update.
	(get_path_expr_parent): Rename it to varobj_get_path_expr_parent.
	Make it extern.
	(is_anonymous_child): Move it to c-varobj.c and rename to
	varobj_is_anonymous_child.  Caller update.
	(get_type): Move it to c-varobj.c.
	(get_value_type): Rename it varobj_get_value_type.  Make it
	extern.
	(get_target_type): Move it gdbtypes.c.
	(varobj_formatted_print_options): New function.
	(value_get_print_value): Rename it to
	varobj_value_get_print_value and make it extern.
	(varobj_value_is_changeable_p): Make it extern.
	(adjust_value_for_child_access): Move it to c-varobj.c.
	(default_value_is_changeable_p): Rename it to
	varobj_default_value_is_changeable_p.  Make it extern.
	(c_number_of_children, c_name_of_variable): Move it to c-varobj.c
	(c_name_of_child, c_path_expr_of_child): Likewise.
	(c_value_of_child, c_type_of_child): Likewise.
	(c_value_of_variable, cplus_number_of_children): Likewise.
	(cplus_class_num_children, cplus_name_of_variable): Likewise.
	(cplus_name_of_child, cplus_path_expr_of_child): Likewise.
	(cplus_value_of_child, cplus_type_of_child): Likewise.
	(cplus_value_of_variable): Likewise.
	(java_number_of_children, java_name_of_variable): Move it to jv-varobj.c.
	(java_name_of_child, java_path_expr_of_child): Likewise.
	(java_value_of_child, java_type_of_child): Likewise.
	(java_value_of_variable): Likewise.
	(ada_number_of_children, ada_name_of_variable): Move it to ada-varobj.c.
	(ada_name_of_child, ada_path_expr_of_child): Likewise.
	(ada_value_of_child, ada_type_of_child): Likewise.
	(ada_value_of_variable, ada_value_is_changeable_p): Likewise.
	(ada_value_has_mutated): Likewise.
	* varobj.h (CPLUS_FAKE_CHILD): New macro, moved from varobj.c.
	(struct lang_varobj_ops): New.  Renamed by 'struct language_specific'.
	(c_varobj_ops, cplus_varobj_ops): Declare.
	(java_varobj_ops, ada_varobj_ops): Declare.
	(varobj_default_value_is_changeable_p): Declare.
	(varobj_value_is_changeable_p): Declare.
	(varobj_get_value_type, varobj_is_anonymous_child): Declare.
	(varobj_get_path_expr_parent): Declare.
	(varobj_value_get_print_value): Declare.
	(varobj_formatted_print_options): Declare.
	(varobj_restrict_range): Declare.
2013-10-17 13:28:37 +00:00