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stack.c
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/* Print and select stack frames for GDB, the GNU debugger.
Copyright (C) 1986-2024 Free Software Foundation, Inc.
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 "event-top.h"
#include "exceptions.h"
#include "extract-store-integer.h"
#include "top.h"
#include "value.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "language.h"
#include "frame.h"
#include "cli/cli-cmds.h"
#include "gdbcore.h"
#include "target.h"
#include "source.h"
#include "breakpoint.h"
#include "demangle.h"
#include "inferior.h"
#include "annotate.h"
#include "ui-out.h"
#include "block.h"
#include "stack.h"
#include "dictionary.h"
#include "reggroups.h"
#include "regcache.h"
#include "solib.h"
#include "valprint.h"
#include "gdbthread.h"
#include "cp-support.h"
#include "disasm.h"
#include "inline-frame.h"
#include "linespec.h"
#include "cli/cli-utils.h"
#include "objfiles.h"
#include "symfile.h"
#include "extension.h"
#include "observable.h"
#include "gdbsupport/def-vector.h"
#include "cli/cli-option.h"
#include "cli/cli-style.h"
#include "gdbsupport/buildargv.h"
/* The possible choices of "set print frame-arguments", and the value
of this setting. */
const char print_frame_arguments_all[] = "all";
const char print_frame_arguments_scalars[] = "scalars";
const char print_frame_arguments_none[] = "none";
const char print_frame_arguments_presence[] = "presence";
static const char *const print_frame_arguments_choices[] =
{
print_frame_arguments_all,
print_frame_arguments_scalars,
print_frame_arguments_none,
print_frame_arguments_presence,
NULL
};
/* The possible choices of "set print frame-info", and the value
of this setting. */
const char print_frame_info_auto[] = "auto";
const char print_frame_info_source_line[] = "source-line";
const char print_frame_info_location[] = "location";
const char print_frame_info_source_and_location[] = "source-and-location";
const char print_frame_info_location_and_address[] = "location-and-address";
const char print_frame_info_short_location[] = "short-location";
static const char *const print_frame_info_choices[] =
{
print_frame_info_auto,
print_frame_info_source_line,
print_frame_info_location,
print_frame_info_source_and_location,
print_frame_info_location_and_address,
print_frame_info_short_location,
NULL
};
/* print_frame_info_print_what[i] maps a choice to the corresponding
print_what enum. */
static const std::optional<enum print_what> print_frame_info_print_what[] =
{{}, /* Empty value for "auto". */
SRC_LINE, LOCATION, SRC_AND_LOC, LOC_AND_ADDRESS, SHORT_LOCATION};
/* The possible choices of "set print entry-values", and the value
of this setting. */
const char print_entry_values_no[] = "no";
const char print_entry_values_only[] = "only";
const char print_entry_values_preferred[] = "preferred";
const char print_entry_values_if_needed[] = "if-needed";
const char print_entry_values_both[] = "both";
const char print_entry_values_compact[] = "compact";
const char print_entry_values_default[] = "default";
static const char *const print_entry_values_choices[] =
{
print_entry_values_no,
print_entry_values_only,
print_entry_values_preferred,
print_entry_values_if_needed,
print_entry_values_both,
print_entry_values_compact,
print_entry_values_default,
NULL
};
/* See frame.h. */
frame_print_options user_frame_print_options;
/* Option definitions for some frame-related "set print ..."
settings. */
using boolean_option_def
= gdb::option::boolean_option_def<frame_print_options>;
using enum_option_def
= gdb::option::enum_option_def<frame_print_options>;
static const gdb::option::option_def frame_print_option_defs[] = {
enum_option_def {
"entry-values",
print_entry_values_choices,
[] (frame_print_options *opt) { return &opt->print_entry_values; },
NULL, /* show_cmd_cb */
N_("Set printing of function arguments at function entry."),
N_("Show printing of function arguments at function entry."),
N_("GDB can sometimes determine the values of function arguments at entry,\n\
in addition to their current values. This option tells GDB whether\n\
to print the current value, the value at entry (marked as val@entry),\n\
or both. Note that one or both of these values may be <optimized out>."),
},
enum_option_def {
"frame-arguments",
print_frame_arguments_choices,
[] (frame_print_options *opt) { return &opt->print_frame_arguments; },
NULL, /* show_cmd_cb */
N_("Set printing of non-scalar frame arguments."),
N_("Show printing of non-scalar frame arguments."),
NULL /* help_doc */
},
boolean_option_def {
"raw-frame-arguments",
[] (frame_print_options *opt) { return &opt->print_raw_frame_arguments; },
NULL, /* show_cmd_cb */
N_("Set whether to print frame arguments in raw form."),
N_("Show whether to print frame arguments in raw form."),
N_("If set, frame arguments are printed in raw form, bypassing any\n\
pretty-printers for that value.")
},
enum_option_def {
"frame-info",
print_frame_info_choices,
[] (frame_print_options *opt) { return &opt->print_frame_info; },
NULL, /* show_cmd_cb */
N_("Set printing of frame information."),
N_("Show printing of frame information."),
NULL /* help_doc */
}
};
/* Options for the "backtrace" command. */
struct backtrace_cmd_options
{
bool full = false;
bool no_filters = false;
bool hide = false;
};
using bt_flag_option_def
= gdb::option::flag_option_def<backtrace_cmd_options>;
static const gdb::option::option_def backtrace_command_option_defs[] = {
bt_flag_option_def {
"full",
[] (backtrace_cmd_options *opt) { return &opt->full; },
N_("Print values of local variables.")
},
bt_flag_option_def {
"no-filters",
[] (backtrace_cmd_options *opt) { return &opt->no_filters; },
N_("Prohibit frame filters from executing on a backtrace."),
},
bt_flag_option_def {
"hide",
[] (backtrace_cmd_options *opt) { return &opt->hide; },
N_("Causes Python frame filter elided frames to not be printed."),
},
};
/* Prototypes for local functions. */
static void print_frame_local_vars (const frame_info_ptr &frame,
bool quiet,
const char *regexp, const char *t_regexp,
int num_tabs, struct ui_file *stream);
static void print_frame (struct ui_out *uiout,
const frame_print_options &opts,
const frame_info_ptr &frame, int print_level,
enum print_what print_what, int print_args,
struct symtab_and_line sal);
static frame_info_ptr find_frame_for_function (const char *);
static frame_info_ptr find_frame_for_address (CORE_ADDR);
/* Class used to manage tracking the last symtab we displayed. */
class last_displayed_symtab_info_type
{
public:
/* True if the cached information is valid. */
bool is_valid () const
{ return m_valid; }
/* Return the cached program_space. If the cache is invalid nullptr is
returned. */
struct program_space *pspace () const
{ return m_pspace; }
/* Return the cached CORE_ADDR address. If the cache is invalid 0 is
returned. */
CORE_ADDR address () const
{ return m_address; }
/* Return the cached symtab. If the cache is invalid nullptr is
returned. */
struct symtab *symtab () const
{ return m_symtab; }
/* Return the cached line number. If the cache is invalid 0 is
returned. */
int line () const
{ return m_line; }
/* Invalidate the cache, reset all the members to their default value. */
void invalidate ()
{
m_valid = false;
m_pspace = nullptr;
m_address = 0;
m_symtab = nullptr;
m_line = 0;
}
/* Store a new set of values in the cache. */
void set (struct program_space *pspace, CORE_ADDR address,
struct symtab *symtab, int line)
{
gdb_assert (pspace != nullptr);
m_valid = true;
m_pspace = pspace;
m_address = address;
m_symtab = symtab;
m_line = line;
}
private:
/* True when the cache is valid. */
bool m_valid = false;
/* The last program space displayed. */
struct program_space *m_pspace = nullptr;
/* The last address displayed. */
CORE_ADDR m_address = 0;
/* The last symtab displayed. */
struct symtab *m_symtab = nullptr;
/* The last line number displayed. */
int m_line = 0;
};
/* An actual instance of the cache, holds information about the last symtab
displayed. */
static last_displayed_symtab_info_type last_displayed_symtab_info;
/* See stack.h. */
bool
frame_show_address (const frame_info_ptr &frame,
struct symtab_and_line sal)
{
/* If there is a line number, but no PC, then there is no location
information associated with this sal. The only way that should
happen is for the call sites of inlined functions (SAL comes from
find_frame_sal). Otherwise, we would have some PC range if the
SAL came from a line table. */
if (sal.line != 0 && sal.pc == 0 && sal.end == 0)
{
if (get_next_frame (frame) == NULL)
gdb_assert (inline_skipped_frames (inferior_thread ()) > 0);
else
gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME);
return false;
}
return get_frame_pc (frame) != sal.pc || !sal.is_stmt;
}
/* See frame.h. */
void
print_stack_frame_to_uiout (struct ui_out *uiout, const frame_info_ptr &frame,
int print_level, enum print_what print_what,
int set_current_sal)
{
scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout);
print_stack_frame (frame, print_level, print_what, set_current_sal);
}
/* Show or print a stack frame FRAME briefly. The output is formatted
according to PRINT_LEVEL and PRINT_WHAT printing the frame's
relative level, function name, argument list, and file name and
line number. If the frame's PC is not at the beginning of the
source line, the actual PC is printed at the beginning. */
void
print_stack_frame (const frame_info_ptr &frame, int print_level,
enum print_what print_what,
int set_current_sal)
{
/* For mi, always print location and address. */
if (current_uiout->is_mi_like_p ())
print_what = LOC_AND_ADDRESS;
try
{
print_frame_info (user_frame_print_options,
frame, print_level, print_what, 1 /* print_args */,
set_current_sal);
if (set_current_sal)
set_current_sal_from_frame (frame);
}
catch (const gdb_exception_error &e)
{
}
}
/* Print nameless arguments of frame FRAME on STREAM, where START is
the offset of the first nameless argument, and NUM is the number of
nameless arguments to print. FIRST is nonzero if this is the first
argument (not just the first nameless argument). */
static void
print_frame_nameless_args (const frame_info_ptr &frame, long start, int num,
int first, struct ui_file *stream)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int i;
CORE_ADDR argsaddr;
long arg_value;
for (i = 0; i < num; i++)
{
QUIT;
argsaddr = get_frame_args_address (frame);
if (!argsaddr)
return;
arg_value = read_memory_integer (argsaddr + start,
sizeof (int), byte_order);
if (!first)
gdb_printf (stream, ", ");
gdb_printf (stream, "%ld", arg_value);
first = 0;
start += sizeof (int);
}
}
/* Print single argument of inferior function. ARG must be already
read in.
Errors are printed as if they would be the parameter value. Use zeroed ARG
iff it should not be printed according to user settings. */
static void
print_frame_arg (const frame_print_options &fp_opts,
const struct frame_arg *arg)
{
struct ui_out *uiout = current_uiout;
string_file stb;
gdb_assert (!arg->val || !arg->error);
gdb_assert (arg->entry_kind == print_entry_values_no
|| arg->entry_kind == print_entry_values_only
|| (!uiout->is_mi_like_p ()
&& arg->entry_kind == print_entry_values_compact));
annotate_arg_emitter arg_emitter;
ui_out_emit_tuple tuple_emitter (uiout, NULL);
gdb_puts (arg->sym->print_name (), &stb);
if (arg->entry_kind == print_entry_values_compact)
{
/* It is OK to provide invalid MI-like stream as with
PRINT_ENTRY_VALUE_COMPACT we never use MI. */
stb.puts ("=");
gdb_puts (arg->sym->print_name (), &stb);
}
if (arg->entry_kind == print_entry_values_only
|| arg->entry_kind == print_entry_values_compact)
stb.puts ("@entry");
uiout->field_stream ("name", stb, variable_name_style.style ());
annotate_arg_name_end ();
uiout->text ("=");
ui_file_style style;
if (!arg->val && !arg->error)
uiout->text ("...");
else
{
if (arg->error)
{
stb.printf (_("<error reading variable: %s>"), arg->error.get ());
style = metadata_style.style ();
}
else
{
try
{
const struct language_defn *language;
struct value_print_options vp_opts;
/* Avoid value_print because it will deref ref parameters. We
just want to print their addresses. Print ??? for args whose
address we do not know. We pass 2 as "recurse" to val_print
because our standard indentation here is 4 spaces, and
val_print indents 2 for each recurse. */
annotate_arg_value (arg->val->type ());
/* Use the appropriate language to display our symbol, unless the
user forced the language to a specific language. */
if (language_mode == language_mode_auto)
language = language_def (arg->sym->language ());
else
language = current_language;
get_no_prettyformat_print_options (&vp_opts);
vp_opts.deref_ref = true;
vp_opts.raw = fp_opts.print_raw_frame_arguments;
/* True in "summary" mode, false otherwise. */
vp_opts.summary
= fp_opts.print_frame_arguments == print_frame_arguments_scalars;
common_val_print_checked (arg->val, &stb, 2, &vp_opts, language);
}
catch (const gdb_exception_error &except)
{
stb.printf (_("<error reading variable: %s>"),
except.what ());
style = metadata_style.style ();
}
}
}
uiout->field_stream ("value", stb, style);
}
/* Read in inferior function local SYM at FRAME into ARGP. Caller is
responsible for xfree of ARGP->ERROR. This function never throws an
exception. */
void
read_frame_local (struct symbol *sym, const frame_info_ptr &frame,
struct frame_arg *argp)
{
argp->sym = sym;
argp->val = NULL;
argp->error = NULL;
try
{
argp->val = read_var_value (sym, NULL, frame);
}
catch (const gdb_exception_error &except)
{
argp->error.reset (xstrdup (except.what ()));
}
}
/* Read in inferior function parameter SYM at FRAME into ARGP. This
function never throws an exception. */
void
read_frame_arg (const frame_print_options &fp_opts,
symbol *sym, const frame_info_ptr &frame,
struct frame_arg *argp, struct frame_arg *entryargp)
{
struct value *val = NULL, *entryval = NULL;
char *val_error = NULL, *entryval_error = NULL;
int val_equal = 0;
if (fp_opts.print_entry_values != print_entry_values_only
&& fp_opts.print_entry_values != print_entry_values_preferred)
{
try
{
val = read_var_value (sym, NULL, frame);
}
catch (const gdb_exception_error &except)
{
val_error = (char *) alloca (except.message->size () + 1);
strcpy (val_error, except.what ());
}
}
if (const symbol_computed_ops *computed_ops = sym->computed_ops ();
(computed_ops != nullptr
&& computed_ops->read_variable_at_entry != nullptr
&& fp_opts.print_entry_values != print_entry_values_no
&& (fp_opts.print_entry_values != print_entry_values_if_needed || !val
|| val->optimized_out ())))
{
try
{
entryval = computed_ops->read_variable_at_entry (sym, frame);
}
catch (const gdb_exception_error &except)
{
if (except.error != NO_ENTRY_VALUE_ERROR)
{
entryval_error = (char *) alloca (except.message->size () + 1);
strcpy (entryval_error, except.what ());
}
}
if (entryval != NULL && entryval->optimized_out ())
entryval = NULL;
if (fp_opts.print_entry_values == print_entry_values_compact
|| fp_opts.print_entry_values == print_entry_values_default)
{
/* For MI do not try to use print_entry_values_compact for ARGP. */
if (val && entryval && !current_uiout->is_mi_like_p ())
{
struct type *type = val->type ();
if (val->lazy ())
val->fetch_lazy ();
if (entryval->lazy ())
entryval->fetch_lazy ();
if (val->contents_eq (0, entryval, 0, type->length ()))
{
/* Initialize it just to avoid a GCC false warning. */
struct value *val_deref = NULL, *entryval_deref;
/* DW_AT_call_value does match with the current
value. If it is a reference still try to verify if
dereferenced DW_AT_call_data_value does not differ. */
try
{
struct type *type_deref;
val_deref = coerce_ref (val);
if (val_deref->lazy ())
val_deref->fetch_lazy ();
type_deref = val_deref->type ();
entryval_deref = coerce_ref (entryval);
if (entryval_deref->lazy ())
entryval_deref->fetch_lazy ();
/* If the reference addresses match but dereferenced
content does not match print them. */
if (val != val_deref
&& val_deref->contents_eq (0,
entryval_deref, 0,
type_deref->length ()))
val_equal = 1;
}
catch (const gdb_exception_error &except)
{
/* If the dereferenced content could not be
fetched do not display anything. */
if (except.error == NO_ENTRY_VALUE_ERROR)
val_equal = 1;
else if (except.message != NULL)
{
entryval_error
= (char *) alloca (except.message->size () + 1);
strcpy (entryval_error, except.what ());
}
}
/* Value was not a reference; and its content matches. */
if (val == val_deref)
val_equal = 1;
if (val_equal)
entryval = NULL;
}
}
/* Try to remove possibly duplicate error message for ENTRYARGP even
in MI mode. */
if (val_error && entryval_error
&& strcmp (val_error, entryval_error) == 0)
{
entryval_error = NULL;
/* Do not se VAL_EQUAL as the same error message may be shown for
the entry value even if no entry values are present in the
inferior. */
}
}
}
if (entryval == NULL)
{
if (fp_opts.print_entry_values == print_entry_values_preferred)
{
gdb_assert (val == NULL);
try
{
val = read_var_value (sym, NULL, frame);
}
catch (const gdb_exception_error &except)
{
val_error = (char *) alloca (except.message->size () + 1);
strcpy (val_error, except.what ());
}
}
if (fp_opts.print_entry_values == print_entry_values_only
|| fp_opts.print_entry_values == print_entry_values_both
|| (fp_opts.print_entry_values == print_entry_values_preferred
&& (!val || val->optimized_out ())))
{
entryval = value::allocate_optimized_out (sym->type ());
entryval_error = NULL;
}
}
if ((fp_opts.print_entry_values == print_entry_values_compact
|| fp_opts.print_entry_values == print_entry_values_if_needed
|| fp_opts.print_entry_values == print_entry_values_preferred)
&& (!val || val->optimized_out ()) && entryval != NULL)
{
val = NULL;
val_error = NULL;
}
argp->sym = sym;
argp->val = val;
argp->error.reset (val_error ? xstrdup (val_error) : NULL);
if (!val && !val_error)
argp->entry_kind = print_entry_values_only;
else if ((fp_opts.print_entry_values == print_entry_values_compact
|| fp_opts.print_entry_values == print_entry_values_default)
&& val_equal)
{
argp->entry_kind = print_entry_values_compact;
gdb_assert (!current_uiout->is_mi_like_p ());
}
else
argp->entry_kind = print_entry_values_no;
entryargp->sym = sym;
entryargp->val = entryval;
entryargp->error.reset (entryval_error ? xstrdup (entryval_error) : NULL);
if (!entryval && !entryval_error)
entryargp->entry_kind = print_entry_values_no;
else
entryargp->entry_kind = print_entry_values_only;
}
/* Print the arguments of frame FRAME on STREAM, given the function
FUNC running in that frame (as a symbol), where NUM is the number
of arguments according to the stack frame (or -1 if the number of
arguments is unknown). */
/* Note that currently the "number of arguments according to the
stack frame" is only known on VAX where i refers to the "number of
ints of arguments according to the stack frame". */
static void
print_frame_args (const frame_print_options &fp_opts,
struct symbol *func, const frame_info_ptr &frame,
int num, struct ui_file *stream)
{
struct ui_out *uiout = current_uiout;
int first = 1;
/* Offset of next stack argument beyond the one we have seen that is
at the highest offset, or -1 if we haven't come to a stack
argument yet. */
long highest_offset = -1;
/* Number of ints of arguments that we have printed so far. */
int args_printed = 0;
/* True if we should print arg names. If false, we only indicate
the presence of arguments by printing ellipsis. */
bool print_names
= fp_opts.print_frame_arguments != print_frame_arguments_presence;
/* True if we should print arguments, false otherwise. */
bool print_args
= (print_names
&& fp_opts.print_frame_arguments != print_frame_arguments_none);
if (func)
{
const struct block *b = func->value_block ();
for (struct symbol *sym : block_iterator_range (b))
{
struct frame_arg arg, entryarg;
QUIT;
/* Keep track of the highest stack argument offset seen, and
skip over any kinds of symbols we don't care about. */
if (!sym->is_argument ())
continue;
if (!print_names)
{
uiout->text ("...");
first = 0;
break;
}
switch (sym->aclass ())
{
case LOC_ARG:
case LOC_REF_ARG:
{
long current_offset = sym->value_longest ();
int arg_size = sym->type ()->length ();
/* Compute address of next argument by adding the size of
this argument and rounding to an int boundary. */
current_offset =
((current_offset + arg_size + sizeof (int) - 1)
& ~(sizeof (int) - 1));
/* If this is the highest offset seen yet, set
highest_offset. */
if (highest_offset == -1
|| (current_offset > highest_offset))
highest_offset = current_offset;
/* Add the number of ints we're about to print to
args_printed. */
args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
}
/* We care about types of symbols, but don't need to
keep track of stack offsets in them. */
case LOC_REGISTER:
case LOC_REGPARM_ADDR:
case LOC_COMPUTED:
case LOC_OPTIMIZED_OUT:
default:
break;
}
/* We have to look up the symbol because arguments can have
two entries (one a parameter, one a local) and the one we
want is the local, which lookup_symbol will find for us.
This includes gcc1 (not gcc2) on SPARC when passing a
small structure and gcc2 when the argument type is float
and it is passed as a double and converted to float by
the prologue (in the latter case the type of the LOC_ARG
symbol is double and the type of the LOC_LOCAL symbol is
float). */
/* But if the parameter name is null, don't try it. Null
parameter names occur on the RS/6000, for traceback
tables. FIXME, should we even print them? */
if (*sym->linkage_name ())
{
struct symbol *nsym;
nsym = lookup_symbol_search_name (sym->search_name (),
b, SEARCH_VAR_DOMAIN).symbol;
gdb_assert (nsym != NULL);
if (nsym->aclass () == LOC_REGISTER
&& !nsym->is_argument ())
{
/* There is a LOC_ARG/LOC_REGISTER pair. This means
that it was passed on the stack and loaded into a
register, or passed in a register and stored in a
stack slot. GDB 3.x used the LOC_ARG; GDB
4.0-4.11 used the LOC_REGISTER.
Reasons for using the LOC_ARG:
(1) Because find_saved_registers may be slow for
remote debugging.
(2) Because registers are often re-used and stack
slots rarely (never?) are. Therefore using
the stack slot is much less likely to print
garbage.
Reasons why we might want to use the LOC_REGISTER:
(1) So that the backtrace prints the same value
as "print foo". I see no compelling reason
why this needs to be the case; having the
backtrace print the value which was passed
in, and "print foo" print the value as
modified within the called function, makes
perfect sense to me.
Additional note: It might be nice if "info args"
displayed both values.
One more note: There is a case with SPARC
structure passing where we need to use the
LOC_REGISTER, but this is dealt with by creating
a single LOC_REGPARM in symbol reading. */
/* Leave sym (the LOC_ARG) alone. */
;
}
else
sym = nsym;
}
/* Print the current arg. */
if (!first)
uiout->text (", ");
uiout->wrap_hint (4);
if (!print_args)
{
arg.sym = sym;
arg.entry_kind = print_entry_values_no;
entryarg.sym = sym;
entryarg.entry_kind = print_entry_values_no;
}
else
read_frame_arg (fp_opts, sym, frame, &arg, &entryarg);
if (arg.entry_kind != print_entry_values_only)
print_frame_arg (fp_opts, &arg);
if (entryarg.entry_kind != print_entry_values_no)
{
if (arg.entry_kind != print_entry_values_only)
{
uiout->text (", ");
uiout->wrap_hint (4);
}
print_frame_arg (fp_opts, &entryarg);
}
first = 0;
}
}
/* Don't print nameless args in situations where we don't know
enough about the stack to find them. */
if (num != -1)
{
long start;
if (highest_offset == -1)
start = gdbarch_frame_args_skip (get_frame_arch (frame));
else
start = highest_offset;
if (!print_names && !first && num > 0)
uiout->text ("...");
else
print_frame_nameless_args (frame, start, num - args_printed,
first, stream);
}
}
/* Set the current source and line to the location given by frame
FRAME, if possible. When CENTER is true, adjust so the relevant
line is in the center of the next 'list'. */
void
set_current_sal_from_frame (const frame_info_ptr &frame)
{
symtab_and_line sal = find_frame_sal (frame);
if (sal.symtab != NULL)
set_current_source_symtab_and_line (sal);
}
/* If ON, GDB will display disassembly of the next source line when
execution of the program being debugged stops.
If AUTO (which is the default), or there's no line info to determine
the source line of the next instruction, display disassembly of next
instruction instead. */
static enum auto_boolean disassemble_next_line;
static void
show_disassemble_next_line (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
gdb_printf (file,
_("Debugger's willingness to use "
"disassemble-next-line is %s.\n"),
value);
}
/* Use TRY_CATCH to catch the exception from the gdb_disassembly
because it will be broken by filter sometime. */
static void
do_gdb_disassembly (struct gdbarch *gdbarch,
int how_many, CORE_ADDR low, CORE_ADDR high)
{
try
{
gdb_disassembly (gdbarch, current_uiout,
DISASSEMBLY_RAW_INSN, how_many,
low, high);
}
catch (const gdb_exception_error &exception)
{
/* If an exception was thrown while doing the disassembly, print
the error message, to give the user a clue of what happened. */
exception_print (gdb_stderr, exception);
}
}
/* Converts the PRINT_FRAME_INFO choice to an optional enum print_what.
Value not present indicates to the caller to use default values
specific to the command being executed. */
static std::optional<enum print_what>
print_frame_info_to_print_what (const char *print_frame_info)
{
for (int i = 0; print_frame_info_choices[i] != NULL; i++)
if (print_frame_info == print_frame_info_choices[i])
return print_frame_info_print_what[i];
internal_error ("Unexpected print frame-info value `%s'.",
print_frame_info);
}
/* Print the PC from FRAME, plus any flags, to UIOUT. */
static void
print_pc (struct ui_out *uiout, struct gdbarch *gdbarch, const frame_info_ptr &frame,
CORE_ADDR pc)
{
uiout->field_core_addr ("addr", gdbarch, pc);
std::string flags = gdbarch_get_pc_address_flags (gdbarch, frame, pc);
if (!flags.empty ())
{
uiout->text (" [");
uiout->field_string ("addr_flags", flags);
uiout->text ("]");
}
}
/* See stack.h. */
void
get_user_print_what_frame_info (std::optional<enum print_what> *what)