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

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/* MI Command Set - stack commands.
Copyright (C) 2000-2017 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 "target.h"
#include "frame.h"
#include "value.h"
#include "mi-cmds.h"
#include "ui-out.h"
#include "symtab.h"
#include "block.h"
#include "stack.h"
#include "dictionary.h"
#include "language.h"
#include "valprint.h"
#include "utils.h"
#include "mi-getopt.h"
#include "extension.h"
#include <ctype.h>
#include "mi-parse.h"
#include "common/gdb_optional.h"
enum what_to_list { locals, arguments, all };
static void list_args_or_locals (enum what_to_list what,
enum print_values values,
struct frame_info *fi,
int skip_unavailable);
/* True if we want to allow Python-based frame filters. */
static int frame_filters = 0;
void
mi_cmd_enable_frame_filters (const char *command, char **argv, int argc)
{
if (argc != 0)
error (_("-enable-frame-filters: no arguments allowed"));
frame_filters = 1;
}
/* Like apply_ext_lang_frame_filter, but take a print_values */
static enum ext_lang_bt_status
mi_apply_ext_lang_frame_filter (struct frame_info *frame, int flags,
enum print_values print_values,
struct ui_out *out,
int frame_low, int frame_high)
{
/* ext_lang_frame_args's MI options are compatible with MI print
values. */
return apply_ext_lang_frame_filter (frame, flags,
(enum ext_lang_frame_args) print_values,
out,
frame_low, frame_high);
}
/* Print a list of the stack frames. Args can be none, in which case
we want to print the whole backtrace, or a pair of numbers
specifying the frame numbers at which to start and stop the
display. If the two numbers are equal, a single frame will be
displayed. */
void
mi_cmd_stack_list_frames (const char *command, char **argv, int argc)
{
int frame_low;
int frame_high;
int i;
struct frame_info *fi;
enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
int raw_arg = 0;
int oind = 0;
enum opt
{
NO_FRAME_FILTERS
};
static const struct mi_opt opts[] =
{
{"-no-frame-filters", NO_FRAME_FILTERS, 0},
{ 0, 0, 0 }
};
/* Parse arguments. In this instance we are just looking for
--no-frame-filters. */
while (1)
{
char *oarg;
int opt = mi_getopt ("-stack-list-frames", argc, argv,
opts, &oind, &oarg);
if (opt < 0)
break;
switch ((enum opt) opt)
{
case NO_FRAME_FILTERS:
raw_arg = oind;
break;
}
}
/* After the last option is parsed, there should either be low -
high range, or no further arguments. */
if ((argc - oind != 0) && (argc - oind != 2))
error (_("-stack-list-frames: Usage: [--no-frame-filters] [FRAME_LOW FRAME_HIGH]"));
/* If there is a range, set it. */
if (argc - oind == 2)
{
frame_low = atoi (argv[0 + oind]);
frame_high = atoi (argv[1 + oind]);
}
else
{
/* Called with no arguments, it means we want the whole
backtrace. */
frame_low = -1;
frame_high = -1;
}
/* Let's position fi on the frame at which to start the
display. Could be the innermost frame if the whole stack needs
displaying, or if frame_low is 0. */
for (i = 0, fi = get_current_frame ();
fi && i < frame_low;
i++, fi = get_prev_frame (fi));
if (fi == NULL)
error (_("-stack-list-frames: Not enough frames in stack."));
ui_out_emit_list list_emitter (current_uiout, "stack");
if (! raw_arg && frame_filters)
{
int flags = PRINT_LEVEL | PRINT_FRAME_INFO;
int py_frame_low = frame_low;
/* We cannot pass -1 to frame_low, as that would signify a
relative backtrace from the tail of the stack. So, in the case
of frame_low == -1, assign and increment it. */
if (py_frame_low == -1)
py_frame_low++;
result = apply_ext_lang_frame_filter (get_current_frame (), flags,
NO_VALUES, current_uiout,
py_frame_low, frame_high);
}
/* Run the inbuilt backtrace if there are no filters registered, or
if "--no-frame-filters" has been specified from the command. */
if (! frame_filters || raw_arg || result == EXT_LANG_BT_NO_FILTERS)
{
/* Now let's print the frames up to frame_high, or until there are
frames in the stack. */
for (;
fi && (i <= frame_high || frame_high == -1);
i++, fi = get_prev_frame (fi))
{
QUIT;
/* Print the location and the address always, even for level 0.
If args is 0, don't print the arguments. */
print_frame_info (fi, 1, LOC_AND_ADDRESS, 0 /* args */, 0);
}
}
}
void
mi_cmd_stack_info_depth (const char *command, char **argv, int argc)
{
int frame_high;
int i;
struct frame_info *fi;
if (argc > 1)
error (_("-stack-info-depth: Usage: [MAX_DEPTH]"));
if (argc == 1)
frame_high = atoi (argv[0]);
else
/* Called with no arguments, it means we want the real depth of
the stack. */
frame_high = -1;
for (i = 0, fi = get_current_frame ();
fi && (i < frame_high || frame_high == -1);
i++, fi = get_prev_frame (fi))
QUIT;
current_uiout->field_int ("depth", i);
}
/* Print a list of the locals for the current frame. With argument of
0, print only the names, with argument of 1 print also the
values. */
void
mi_cmd_stack_list_locals (const char *command, char **argv, int argc)
{
struct frame_info *frame;
int raw_arg = 0;
enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
enum print_values print_value;
int oind = 0;
int skip_unavailable = 0;
if (argc > 1)
{
enum opt
{
NO_FRAME_FILTERS,
SKIP_UNAVAILABLE,
};
static const struct mi_opt opts[] =
{
{"-no-frame-filters", NO_FRAME_FILTERS, 0},
{"-skip-unavailable", SKIP_UNAVAILABLE, 0},
{ 0, 0, 0 }
};
while (1)
{
char *oarg;
/* Don't parse 'print-values' as an option. */
int opt = mi_getopt ("-stack-list-locals", argc - 1, argv,
opts, &oind, &oarg);
if (opt < 0)
break;
switch ((enum opt) opt)
{
case NO_FRAME_FILTERS:
raw_arg = oind;
case SKIP_UNAVAILABLE:
skip_unavailable = 1;
break;
}
}
}
/* After the last option is parsed, there should be only
'print-values'. */
if (argc - oind != 1)
error (_("-stack-list-locals: Usage: [--no-frame-filters] "
"[--skip-unavailable] PRINT_VALUES"));
frame = get_selected_frame (NULL);
print_value = mi_parse_print_values (argv[oind]);
if (! raw_arg && frame_filters)
{
int flags = PRINT_LEVEL | PRINT_LOCALS;
result = mi_apply_ext_lang_frame_filter (frame, flags, print_value,
current_uiout, 0, 0);
}
/* Run the inbuilt backtrace if there are no filters registered, or
if "--no-frame-filters" has been specified from the command. */
if (! frame_filters || raw_arg || result == EXT_LANG_BT_NO_FILTERS)
{
list_args_or_locals (locals, print_value, frame,
skip_unavailable);
}
}
/* Print a list of the arguments for the current frame. With argument
of 0, print only the names, with argument of 1 print also the
values. */
void
mi_cmd_stack_list_args (const char *command, char **argv, int argc)
{
int frame_low;
int frame_high;
int i;
struct frame_info *fi;
enum print_values print_values;
struct ui_out *uiout = current_uiout;
int raw_arg = 0;
int oind = 0;
int skip_unavailable = 0;
enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
enum opt
{
NO_FRAME_FILTERS,
SKIP_UNAVAILABLE,
};
static const struct mi_opt opts[] =
{
{"-no-frame-filters", NO_FRAME_FILTERS, 0},
{"-skip-unavailable", SKIP_UNAVAILABLE, 0},
{ 0, 0, 0 }
};
while (1)
{
char *oarg;
int opt = mi_getopt_allow_unknown ("-stack-list-args", argc, argv,
opts, &oind, &oarg);
if (opt < 0)
break;
switch ((enum opt) opt)
{
case NO_FRAME_FILTERS:
raw_arg = oind;
break;
case SKIP_UNAVAILABLE:
skip_unavailable = 1;
break;
}
}
if (argc - oind != 1 && argc - oind != 3)
error (_("-stack-list-arguments: Usage: " \
"[--no-frame-filters] [--skip-unavailable] "
"PRINT_VALUES [FRAME_LOW FRAME_HIGH]"));
if (argc - oind == 3)
{
frame_low = atoi (argv[1 + oind]);
frame_high = atoi (argv[2 + oind]);
}
else
{
/* Called with no arguments, it means we want args for the whole
backtrace. */
frame_low = -1;
frame_high = -1;
}
print_values = mi_parse_print_values (argv[oind]);
/* Let's position fi on the frame at which to start the
display. Could be the innermost frame if the whole stack needs
displaying, or if frame_low is 0. */
for (i = 0, fi = get_current_frame ();
fi && i < frame_low;
i++, fi = get_prev_frame (fi));
if (fi == NULL)
error (_("-stack-list-arguments: Not enough frames in stack."));
ui_out_emit_list list_emitter (uiout, "stack-args");
if (! raw_arg && frame_filters)
{
int flags = PRINT_LEVEL | PRINT_ARGS;
int py_frame_low = frame_low;
/* We cannot pass -1 to frame_low, as that would signify a
relative backtrace from the tail of the stack. So, in the case
of frame_low == -1, assign and increment it. */
if (py_frame_low == -1)
py_frame_low++;
result = mi_apply_ext_lang_frame_filter (get_current_frame (), flags,
print_values, current_uiout,
py_frame_low, frame_high);
}
/* Run the inbuilt backtrace if there are no filters registered, or
if "--no-frame-filters" has been specified from the command. */
if (! frame_filters || raw_arg || result == EXT_LANG_BT_NO_FILTERS)
{
/* Now let's print the frames up to frame_high, or until there are
frames in the stack. */
for (;
fi && (i <= frame_high || frame_high == -1);
i++, fi = get_prev_frame (fi))
{
QUIT;
ui_out_emit_tuple tuple_emitter (uiout, "frame");
uiout->field_int ("level", i);
list_args_or_locals (arguments, print_values, fi, skip_unavailable);
}
}
}
/* Print a list of the local variables (including arguments) for the
current frame. ARGC must be 1 and ARGV[0] specify if only the names,
or both names and values of the variables must be printed. See
parse_print_value for possible values. */
void
mi_cmd_stack_list_variables (const char *command, char **argv, int argc)
{
struct frame_info *frame;
int raw_arg = 0;
enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
enum print_values print_value;
int oind = 0;
int skip_unavailable = 0;
if (argc > 1)
{
enum opt
{
NO_FRAME_FILTERS,
SKIP_UNAVAILABLE,
};
static const struct mi_opt opts[] =
{
{"-no-frame-filters", NO_FRAME_FILTERS, 0},
{"-skip-unavailable", SKIP_UNAVAILABLE, 0},
{ 0, 0, 0 }
};
while (1)
{
char *oarg;
/* Don't parse 'print-values' as an option. */
int opt = mi_getopt ("-stack-list-variables", argc - 1,
argv, opts, &oind, &oarg);
if (opt < 0)
break;
switch ((enum opt) opt)
{
case NO_FRAME_FILTERS:
raw_arg = oind;
break;
case SKIP_UNAVAILABLE:
skip_unavailable = 1;
break;
}
}
}
/* After the last option is parsed, there should be only
'print-values'. */
if (argc - oind != 1)
error (_("-stack-list-variables: Usage: [--no-frame-filters] " \
"[--skip-unavailable] PRINT_VALUES"));
frame = get_selected_frame (NULL);
print_value = mi_parse_print_values (argv[oind]);
if (! raw_arg && frame_filters)
{
int flags = PRINT_LEVEL | PRINT_ARGS | PRINT_LOCALS;
result = mi_apply_ext_lang_frame_filter (frame, flags,
print_value,
current_uiout, 0, 0);
}
/* Run the inbuilt backtrace if there are no filters registered, or
if "--no-frame-filters" has been specified from the command. */
if (! frame_filters || raw_arg || result == EXT_LANG_BT_NO_FILTERS)
{
list_args_or_locals (all, print_value, frame,
skip_unavailable);
}
}
/* Print single local or argument. ARG must be already read in. For
WHAT and VALUES see list_args_or_locals.
Errors are printed as if they would be the parameter value. Use
zeroed ARG iff it should not be printed according to VALUES. If
SKIP_UNAVAILABLE is true, only print ARG if it is available. */
static void
list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
enum print_values values, int skip_unavailable)
{
struct ui_out *uiout = current_uiout;
gdb_assert (!arg->val || !arg->error);
gdb_assert ((values == PRINT_NO_VALUES && arg->val == NULL
&& arg->error == NULL)
|| values == PRINT_SIMPLE_VALUES
|| (values == PRINT_ALL_VALUES
&& (arg->val != NULL || arg->error != NULL)));
gdb_assert (arg->entry_kind == print_entry_values_no
|| (arg->entry_kind == print_entry_values_only
&& (arg->val || arg->error)));
if (skip_unavailable && arg->val != NULL
&& (value_entirely_unavailable (arg->val)
/* A scalar object that does not have all bits available is
also considered unavailable, because all bits contribute
to its representation. */
|| (val_print_scalar_type_p (value_type (arg->val))
&& !value_bytes_available (arg->val,
value_embedded_offset (arg->val),
TYPE_LENGTH (value_type (arg->val))))))
return;
gdb::optional<ui_out_emit_tuple> tuple_emitter;
if (values != PRINT_NO_VALUES || what == all)
tuple_emitter.emplace (uiout, nullptr);
string_file stb;
stb.puts (SYMBOL_PRINT_NAME (arg->sym));
if (arg->entry_kind == print_entry_values_only)
stb.puts ("@entry");
uiout->field_stream ("name", stb);
if (what == all && SYMBOL_IS_ARGUMENT (arg->sym))
uiout->field_int ("arg", 1);
if (values == PRINT_SIMPLE_VALUES)
{
check_typedef (arg->sym->type);
type_print (arg->sym->type, "", &stb, -1);
uiout->field_stream ("type", stb);
}
if (arg->val || arg->error)
{
const char *error_message = NULL;
if (arg->error)
error_message = arg->error;
else
{
TRY
{
struct value_print_options opts;
get_no_prettyformat_print_options (&opts);
opts.deref_ref = 1;
common_val_print (arg->val, &stb, 0, &opts,
language_def (SYMBOL_LANGUAGE (arg->sym)));
}
CATCH (except, RETURN_MASK_ERROR)
{
error_message = except.message;
}
END_CATCH
}
if (error_message != NULL)
stb.printf (_("<error reading variable: %s>"), error_message);
uiout->field_stream ("value", stb);
}
}
/* Print a list of the objects for the frame FI in a certain form,
which is determined by VALUES. The objects can be locals,
arguments or both, which is determined by WHAT. If SKIP_UNAVAILABLE
is true, only print the arguments or local variables whose values
are available. */
static void
list_args_or_locals (enum what_to_list what, enum print_values values,
struct frame_info *fi, int skip_unavailable)
{
const struct block *block;
struct symbol *sym;
struct block_iterator iter;
struct type *type;
const char *name_of_result;
struct ui_out *uiout = current_uiout;
block = get_frame_block (fi, 0);
switch (what)
{
case locals:
name_of_result = "locals";
break;
case arguments:
name_of_result = "args";
break;
case all:
name_of_result = "variables";
break;
default:
internal_error (__FILE__, __LINE__,
"unexpected what_to_list: %d", (int) what);
}
ui_out_emit_list list_emitter (uiout, name_of_result);
while (block != 0)
{
ALL_BLOCK_SYMBOLS (block, iter, sym)
{
int print_me = 0;
switch (SYMBOL_CLASS (sym))
{
default:
case LOC_UNDEF: /* catches errors */
case LOC_CONST: /* constant */
case LOC_TYPEDEF: /* local typedef */
case LOC_LABEL: /* local label */
case LOC_BLOCK: /* local function */
case LOC_CONST_BYTES: /* loc. byte seq. */
case LOC_UNRESOLVED: /* unresolved static */
case LOC_OPTIMIZED_OUT: /* optimized out */
print_me = 0;
break;
case LOC_ARG: /* argument */
case LOC_REF_ARG: /* reference arg */
case LOC_REGPARM_ADDR: /* indirect register arg */
case LOC_LOCAL: /* stack local */
case LOC_STATIC: /* static */
case LOC_REGISTER: /* register */
case LOC_COMPUTED: /* computed location */
if (what == all)
print_me = 1;
else if (what == locals)
print_me = !SYMBOL_IS_ARGUMENT (sym);
else
print_me = SYMBOL_IS_ARGUMENT (sym);
break;
}
if (print_me)
{
struct symbol *sym2;
struct frame_arg arg, entryarg;
if (SYMBOL_IS_ARGUMENT (sym))
sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
block, VAR_DOMAIN,
NULL).symbol;
else
sym2 = sym;
gdb_assert (sym2 != NULL);
memset (&arg, 0, sizeof (arg));
arg.sym = sym2;
arg.entry_kind = print_entry_values_no;
memset (&entryarg, 0, sizeof (entryarg));
entryarg.sym = sym2;
entryarg.entry_kind = print_entry_values_no;
switch (values)
{
case PRINT_SIMPLE_VALUES:
type = check_typedef (sym2->type);
if (TYPE_CODE (type) != TYPE_CODE_ARRAY
&& TYPE_CODE (type) != TYPE_CODE_STRUCT
&& TYPE_CODE (type) != TYPE_CODE_UNION)
{
case PRINT_ALL_VALUES:
if (SYMBOL_IS_ARGUMENT (sym))
read_frame_arg (sym2, fi, &arg, &entryarg);
else
read_frame_local (sym2, fi, &arg);
}
break;
}
if (arg.entry_kind != print_entry_values_only)
list_arg_or_local (&arg, what, values, skip_unavailable);
if (entryarg.entry_kind != print_entry_values_no)
list_arg_or_local (&entryarg, what, values, skip_unavailable);
xfree (arg.error);
xfree (entryarg.error);
}
}
if (BLOCK_FUNCTION (block))
break;
else
block = BLOCK_SUPERBLOCK (block);
}
}
void
mi_cmd_stack_select_frame (const char *command, char **argv, int argc)
{
if (argc == 0 || argc > 1)
error (_("-stack-select-frame: Usage: FRAME_SPEC"));
select_frame_command (argv[0], 1 /* not used */ );
}
void
mi_cmd_stack_info_frame (const char *command, char **argv, int argc)
{
if (argc > 0)
error (_("-stack-info-frame: No arguments allowed"));
print_frame_info (get_selected_frame (NULL), 1, LOC_AND_ADDRESS, 0, 1);
}
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