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binutils-gdb/gdb/mi/mi-cmd-var.c

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/* MI Command Set - varobj commands.
Copyright (C) 2000-2016 Free Software Foundation, Inc.
Contributed by Cygnus Solutions (a Red Hat company).
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "mi-cmds.h"
#include "mi-main.h"
#include "ui-out.h"
#include "mi-out.h"
#include "varobj.h"
#include "language.h"
#include "value.h"
#include <ctype.h>
#include "mi-getopt.h"
#include "gdbthread.h"
#include "mi-parse.h"
extern unsigned int varobjdebug; /* defined in varobj.c. */
static void varobj_update_one (struct varobj *var,
enum print_values print_values,
int is_explicit);
static int mi_print_value_p (struct varobj *var,
enum print_values print_values);
/* Print variable object VAR. The PRINT_VALUES parameter controls
if the value should be printed. The PRINT_EXPRESSION parameter
controls if the expression should be printed. */
static void
print_varobj (struct varobj *var, enum print_values print_values,
int print_expression)
{
struct ui_out *uiout = current_uiout;
char *type;
int thread_id;
char *display_hint;
ui_out_field_string (uiout, "name", varobj_get_objname (var));
if (print_expression)
{
char *exp = varobj_get_expression (var);
ui_out_field_string (uiout, "exp", exp);
xfree (exp);
}
ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
if (mi_print_value_p (var, print_values))
{
char *val = varobj_get_value (var);
ui_out_field_string (uiout, "value", val);
xfree (val);
}
type = varobj_get_type (var);
if (type != NULL)
{
ui_out_field_string (uiout, "type", type);
xfree (type);
}
thread_id = varobj_get_thread_id (var);
if (thread_id > 0)
ui_out_field_int (uiout, "thread-id", thread_id);
if (varobj_get_frozen (var))
ui_out_field_int (uiout, "frozen", 1);
display_hint = varobj_get_display_hint (var);
if (display_hint)
{
ui_out_field_string (uiout, "displayhint", display_hint);
xfree (display_hint);
}
if (varobj_is_dynamic_p (var))
ui_out_field_int (uiout, "dynamic", 1);
}
/* VAROBJ operations */
void
mi_cmd_var_create (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
CORE_ADDR frameaddr = 0;
struct varobj *var;
char *name;
char *frame;
char *expr;
struct cleanup *old_cleanups;
enum varobj_type var_type;
if (argc != 3)
error (_("-var-create: Usage: NAME FRAME EXPRESSION."));
name = xstrdup (argv[0]);
/* Add cleanup for name. Must be free_current_contents as name can
be reallocated. */
old_cleanups = make_cleanup (free_current_contents, &name);
frame = xstrdup (argv[1]);
make_cleanup (xfree, frame);
expr = xstrdup (argv[2]);
make_cleanup (xfree, expr);
if (strcmp (name, "-") == 0)
{
xfree (name);
name = varobj_gen_name ();
}
else if (!isalpha (*name))
error (_("-var-create: name of object must begin with a letter"));
if (strcmp (frame, "*") == 0)
var_type = USE_CURRENT_FRAME;
else if (strcmp (frame, "@") == 0)
var_type = USE_SELECTED_FRAME;
else
{
var_type = USE_SPECIFIED_FRAME;
frameaddr = string_to_core_addr (frame);
}
if (varobjdebug)
fprintf_unfiltered (gdb_stdlog,
"Name=\"%s\", Frame=\"%s\" (%s), Expression=\"%s\"\n",
name, frame, hex_string (frameaddr), expr);
var = varobj_create (name, expr, frameaddr, var_type);
if (var == NULL)
error (_("-var-create: unable to create variable object"));
print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
ui_out_field_int (uiout, "has_more", varobj_has_more (var, 0));
do_cleanups (old_cleanups);
}
void
mi_cmd_var_delete (char *command, char **argv, int argc)
{
char *name;
struct varobj *var;
int numdel;
int children_only_p = 0;
struct cleanup *old_cleanups;
struct ui_out *uiout = current_uiout;
if (argc < 1 || argc > 2)
error (_("-var-delete: Usage: [-c] EXPRESSION."));
name = xstrdup (argv[0]);
/* Add cleanup for name. Must be free_current_contents as name can
be reallocated. */
old_cleanups = make_cleanup (free_current_contents, &name);
/* If we have one single argument it cannot be '-c' or any string
starting with '-'. */
if (argc == 1)
{
if (strcmp (name, "-c") == 0)
error (_("-var-delete: Missing required "
"argument after '-c': variable object name"));
if (*name == '-')
error (_("-var-delete: Illegal variable object name"));
}
/* If we have 2 arguments they must be '-c' followed by a string
which would be the variable name. */
if (argc == 2)
{
if (strcmp (name, "-c") != 0)
error (_("-var-delete: Invalid option."));
children_only_p = 1;
do_cleanups (old_cleanups);
name = xstrdup (argv[1]);
old_cleanups = make_cleanup (free_current_contents, &name);
}
/* If we didn't error out, now NAME contains the name of the
variable. */
var = varobj_get_handle (name);
numdel = varobj_delete (var, children_only_p);
ui_out_field_int (uiout, "ndeleted", numdel);
do_cleanups (old_cleanups);
}
/* Parse a string argument into a format value. */
static enum varobj_display_formats
mi_parse_format (const char *arg)
{
if (arg != NULL)
{
int len;
len = strlen (arg);
if (strncmp (arg, "natural", len) == 0)
return FORMAT_NATURAL;
else if (strncmp (arg, "binary", len) == 0)
return FORMAT_BINARY;
else if (strncmp (arg, "decimal", len) == 0)
return FORMAT_DECIMAL;
else if (strncmp (arg, "hexadecimal", len) == 0)
return FORMAT_HEXADECIMAL;
else if (strncmp (arg, "octal", len) == 0)
return FORMAT_OCTAL;
else if (strncmp (arg, "zero-hexadecimal", len) == 0)
return FORMAT_ZHEXADECIMAL;
}
error (_("Must specify the format as: \"natural\", "
"\"binary\", \"decimal\", \"hexadecimal\", \"octal\" or \"zero-hexadecimal\""));
}
void
mi_cmd_var_set_format (char *command, char **argv, int argc)
{
enum varobj_display_formats format;
struct varobj *var;
char *val;
struct ui_out *uiout = current_uiout;
if (argc != 2)
error (_("-var-set-format: Usage: NAME FORMAT."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
format = mi_parse_format (argv[1]);
/* Set the format of VAR to the given format. */
varobj_set_display_format (var, format);
/* Report the new current format. */
ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
/* Report the value in the new format. */
val = varobj_get_value (var);
ui_out_field_string (uiout, "value", val);
xfree (val);
}
void
mi_cmd_var_set_visualizer (char *command, char **argv, int argc)
{
struct varobj *var;
if (argc != 2)
error (_("Usage: NAME VISUALIZER_FUNCTION."));
var = varobj_get_handle (argv[0]);
if (var == NULL)
error (_("Variable object not found"));
varobj_set_visualizer (var, argv[1]);
}
void
mi_cmd_var_set_frozen (char *command, char **argv, int argc)
{
struct varobj *var;
int frozen;
if (argc != 2)
error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
var = varobj_get_handle (argv[0]);
if (strcmp (argv[1], "0") == 0)
frozen = 0;
else if (strcmp (argv[1], "1") == 0)
frozen = 1;
else
error (_("Invalid flag value"));
varobj_set_frozen (var, frozen);
/* We don't automatically return the new value, or what varobjs got
new values during unfreezing. If this information is required,
client should call -var-update explicitly. */
}
void
mi_cmd_var_show_format (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
enum varobj_display_formats format;
struct varobj *var;
if (argc != 1)
error (_("-var-show-format: Usage: NAME."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
format = varobj_get_display_format (var);
/* Report the current format. */
ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
}
void
mi_cmd_var_info_num_children (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct varobj *var;
if (argc != 1)
error (_("-var-info-num-children: Usage: NAME."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
}
/* Return 1 if given the argument PRINT_VALUES we should display
the varobj VAR. */
static int
mi_print_value_p (struct varobj *var, enum print_values print_values)
{
struct type *type;
if (print_values == PRINT_NO_VALUES)
return 0;
if (print_values == PRINT_ALL_VALUES)
return 1;
if (varobj_is_dynamic_p (var))
return 1;
type = varobj_get_gdb_type (var);
if (type == NULL)
return 1;
else
{
type = check_typedef (type);
/* For PRINT_SIMPLE_VALUES, only print the value if it has a type
and that type is not a compound type. */
return (TYPE_CODE (type) != TYPE_CODE_ARRAY
&& TYPE_CODE (type) != TYPE_CODE_STRUCT
&& TYPE_CODE (type) != TYPE_CODE_UNION);
}
}
void
mi_cmd_var_list_children (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct varobj *var;
VEC(varobj_p) *children;
struct varobj *child;
enum print_values print_values;
int ix;
int from, to;
char *display_hint;
if (argc < 1 || argc > 4)
error (_("-var-list-children: Usage: "
"[PRINT_VALUES] NAME [FROM TO]"));
/* Get varobj handle, if a valid var obj name was specified. */
if (argc == 1 || argc == 3)
var = varobj_get_handle (argv[0]);
else
var = varobj_get_handle (argv[1]);
if (argc > 2)
{
from = atoi (argv[argc - 2]);
to = atoi (argv[argc - 1]);
}
else
{
from = -1;
to = -1;
}
children = varobj_list_children (var, &from, &to);
ui_out_field_int (uiout, "numchild", to - from);
if (argc == 2 || argc == 4)
print_values = mi_parse_print_values (argv[0]);
else
print_values = PRINT_NO_VALUES;
display_hint = varobj_get_display_hint (var);
if (display_hint)
{
ui_out_field_string (uiout, "displayhint", display_hint);
xfree (display_hint);
}
if (from < to)
{
struct cleanup *cleanup_children;
if (mi_version (uiout) == 1)
cleanup_children
= make_cleanup_ui_out_tuple_begin_end (uiout, "children");
else
cleanup_children
= make_cleanup_ui_out_list_begin_end (uiout, "children");
for (ix = from;
ix < to && VEC_iterate (varobj_p, children, ix, child);
++ix)
{
struct cleanup *cleanup_child;
cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
print_varobj (child, print_values, 1 /* print expression */);
do_cleanups (cleanup_child);
}
do_cleanups (cleanup_children);
}
ui_out_field_int (uiout, "has_more", varobj_has_more (var, to));
}
void
mi_cmd_var_info_type (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct varobj *var;
char *type_name;
if (argc != 1)
error (_("-var-info-type: Usage: NAME."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
type_name = varobj_get_type (var);
ui_out_field_string (uiout, "type", type_name);
xfree (type_name);
}
void
mi_cmd_var_info_path_expression (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct varobj *var;
char *path_expr;
if (argc != 1)
error (_("Usage: NAME."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
path_expr = varobj_get_path_expr (var);
ui_out_field_string (uiout, "path_expr", path_expr);
}
void
mi_cmd_var_info_expression (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
const struct language_defn *lang;
struct varobj *var;
char *exp;
if (argc != 1)
error (_("-var-info-expression: Usage: NAME."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
lang = varobj_get_language (var);
ui_out_field_string (uiout, "lang", lang->la_natural_name);
exp = varobj_get_expression (var);
ui_out_field_string (uiout, "exp", exp);
xfree (exp);
}
void
mi_cmd_var_show_attributes (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
int attr;
char *attstr;
struct varobj *var;
if (argc != 1)
error (_("-var-show-attributes: Usage: NAME."));
/* Get varobj handle, if a valid var obj name was specified */
var = varobj_get_handle (argv[0]);
attr = varobj_get_attributes (var);
/* FIXME: define masks for attributes */
if (attr & 0x00000001)
attstr = "editable";
else
attstr = "noneditable";
ui_out_field_string (uiout, "attr", attstr);
}
void
mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct varobj *var;
enum varobj_display_formats format;
int formatFound;
int oind;
char *oarg;
enum opt
{
OP_FORMAT
};
static const struct mi_opt opts[] =
{
{"f", OP_FORMAT, 1},
{ 0, 0, 0 }
};
/* Parse arguments. */
format = FORMAT_NATURAL;
formatFound = 0;
oind = 0;
while (1)
{
int opt = mi_getopt ("-var-evaluate-expression", argc, argv,
opts, &oind, &oarg);
if (opt < 0)
break;
switch ((enum opt) opt)
{
case OP_FORMAT:
if (formatFound)
error (_("Cannot specify format more than once"));
format = mi_parse_format (oarg);
formatFound = 1;
break;
}
}
if (oind >= argc)
error (_("Usage: [-f FORMAT] NAME"));
if (oind < argc - 1)
error (_("Garbage at end of command"));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[oind]);
if (formatFound)
{
char *val = varobj_get_formatted_value (var, format);
ui_out_field_string (uiout, "value", val);
xfree (val);
}
else
{
char *val = varobj_get_value (var);
ui_out_field_string (uiout, "value", val);
xfree (val);
}
}
void
mi_cmd_var_assign (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct varobj *var;
char *expression, *val;
struct cleanup *cleanup;
if (argc != 2)
error (_("-var-assign: Usage: NAME EXPRESSION."));
/* Get varobj handle, if a valid var obj name was specified. */
var = varobj_get_handle (argv[0]);
if (!varobj_editable_p (var))
error (_("-var-assign: Variable object is not editable"));
expression = xstrdup (argv[1]);
/* MI command '-var-assign' may write memory, so suppress memory
changed notification if it does. */
cleanup
= make_cleanup_restore_integer (&mi_suppress_notification.memory);
mi_suppress_notification.memory = 1;
if (!varobj_set_value (var, expression))
error (_("-var-assign: Could not assign "
"expression to variable object"));
val = varobj_get_value (var);
ui_out_field_string (uiout, "value", val);
xfree (val);
do_cleanups (cleanup);
}
/* Type used for parameters passing to mi_cmd_var_update_iter. */
struct mi_cmd_var_update
{
int only_floating;
enum print_values print_values;
};
/* Helper for mi_cmd_var_update - update each VAR. */
static void
mi_cmd_var_update_iter (struct varobj *var, void *data_pointer)
{
struct mi_cmd_var_update *data = (struct mi_cmd_var_update *) data_pointer;
int thread_id, thread_stopped;
thread_id = varobj_get_thread_id (var);
if (thread_id == -1
&& (ptid_equal (inferior_ptid, null_ptid)
|| is_stopped (inferior_ptid)))
thread_stopped = 1;
else
{
struct thread_info *tp = find_thread_global_id (thread_id);
if (tp)
thread_stopped = is_stopped (tp->ptid);
else
thread_stopped = 1;
}
if (thread_stopped
&& (!data->only_floating || varobj_floating_p (var)))
varobj_update_one (var, data->print_values, 0 /* implicit */);
}
void
mi_cmd_var_update (char *command, char **argv, int argc)
{
struct ui_out *uiout = current_uiout;
struct cleanup *cleanup;
char *name;
enum print_values print_values;
if (argc != 1 && argc != 2)
error (_("-var-update: Usage: [PRINT_VALUES] NAME."));
if (argc == 1)
name = argv[0];
else
name = argv[1];
if (argc == 2)
print_values = mi_parse_print_values (argv[0]);
else
print_values = PRINT_NO_VALUES;
if (mi_version (uiout) <= 1)
cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
else
cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
/* Check if the parameter is a "*", which means that we want to
update all variables. */
if ((*name == '*' || *name == '@') && (*(name + 1) == '\0'))
{
struct mi_cmd_var_update data;
data.only_floating = (*name == '@');
data.print_values = print_values;
/* varobj_update_one automatically updates all the children of
VAROBJ. Therefore update each VAROBJ only once by iterating
only the root VAROBJs. */
all_root_varobjs (mi_cmd_var_update_iter, &data);
}
else
{
/* Get varobj handle, if a valid var obj name was specified. */
struct varobj *var = varobj_get_handle (name);
varobj_update_one (var, print_values, 1 /* explicit */);
}
do_cleanups (cleanup);
}
/* Helper for mi_cmd_var_update(). */
static void
varobj_update_one (struct varobj *var, enum print_values print_values,
int is_explicit)
{
struct ui_out *uiout = current_uiout;
VEC (varobj_update_result) *changes;
varobj_update_result *r;
int i;
changes = varobj_update (&var, is_explicit);
for (i = 0; VEC_iterate (varobj_update_result, changes, i, r); ++i)
{
char *display_hint;
int from, to;
struct cleanup *cleanup = make_cleanup (null_cleanup, NULL);
if (mi_version (uiout) > 1)
make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
ui_out_field_string (uiout, "name", varobj_get_objname (r->varobj));
switch (r->status)
{
case VAROBJ_IN_SCOPE:
if (mi_print_value_p (r->varobj, print_values))
{
char *val = varobj_get_value (r->varobj);
ui_out_field_string (uiout, "value", val);
xfree (val);
}
ui_out_field_string (uiout, "in_scope", "true");
break;
case VAROBJ_NOT_IN_SCOPE:
ui_out_field_string (uiout, "in_scope", "false");
break;
case VAROBJ_INVALID:
ui_out_field_string (uiout, "in_scope", "invalid");
break;
}
if (r->status != VAROBJ_INVALID)
{
if (r->type_changed)
ui_out_field_string (uiout, "type_changed", "true");
else
ui_out_field_string (uiout, "type_changed", "false");
}
if (r->type_changed)
{
char *type_name = varobj_get_type (r->varobj);
ui_out_field_string (uiout, "new_type", type_name);
xfree (type_name);
}
if (r->type_changed || r->children_changed)
ui_out_field_int (uiout, "new_num_children",
varobj_get_num_children (r->varobj));
display_hint = varobj_get_display_hint (r->varobj);
if (display_hint)
{
ui_out_field_string (uiout, "displayhint", display_hint);
xfree (display_hint);
}
if (varobj_is_dynamic_p (r->varobj))
ui_out_field_int (uiout, "dynamic", 1);
varobj_get_child_range (r->varobj, &from, &to);
ui_out_field_int (uiout, "has_more",
varobj_has_more (r->varobj, to));
if (r->newobj)
{
int j;
varobj_p child;
struct cleanup *cleanup;
cleanup = make_cleanup_ui_out_list_begin_end (uiout, "new_children");
for (j = 0; VEC_iterate (varobj_p, r->newobj, j, child); ++j)
{
struct cleanup *cleanup_child;
cleanup_child
= make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
print_varobj (child, print_values, 1 /* print_expression */);
do_cleanups (cleanup_child);
}
do_cleanups (cleanup);
VEC_free (varobj_p, r->newobj);
r->newobj = NULL; /* Paranoia. */
}
do_cleanups (cleanup);
}
VEC_free (varobj_update_result, changes);
}
void
mi_cmd_enable_pretty_printing (char *command, char **argv, int argc)
{
if (argc != 0)
error (_("-enable-pretty-printing: no arguments allowed"));
varobj_enable_pretty_printing ();
}
void
mi_cmd_var_set_update_range (char *command, char **argv, int argc)
{
struct varobj *var;
int from, to;
if (argc != 3)
error (_("-var-set-update-range: Usage: VAROBJ FROM TO"));
var = varobj_get_handle (argv[0]);
from = atoi (argv[1]);
to = atoi (argv[2]);
varobj_set_child_range (var, from, to);
}
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