1024 lines
34 KiB
C
1024 lines
34 KiB
C
/* Copyright (C) 1992, 1993, 1994, 1997, 1998, 1999, 2000, 2003, 2004, 2005,
|
|
2007, 2008, 2009, 2010 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 "defs.h"
|
|
#include "observer.h"
|
|
#include "gdbcmd.h"
|
|
#include "target.h"
|
|
#include "ada-lang.h"
|
|
#include "gdbcore.h"
|
|
#include "inferior.h"
|
|
#include "gdbthread.h"
|
|
|
|
/* The name of the array in the GNAT runtime where the Ada Task Control
|
|
Block of each task is stored. */
|
|
#define KNOWN_TASKS_NAME "system__tasking__debug__known_tasks"
|
|
|
|
/* The maximum number of tasks known to the Ada runtime */
|
|
static const int MAX_NUMBER_OF_KNOWN_TASKS = 1000;
|
|
|
|
enum task_states
|
|
{
|
|
Unactivated,
|
|
Runnable,
|
|
Terminated,
|
|
Activator_Sleep,
|
|
Acceptor_Sleep,
|
|
Entry_Caller_Sleep,
|
|
Async_Select_Sleep,
|
|
Delay_Sleep,
|
|
Master_Completion_Sleep,
|
|
Master_Phase_2_Sleep,
|
|
Interrupt_Server_Idle_Sleep,
|
|
Interrupt_Server_Blocked_Interrupt_Sleep,
|
|
Timer_Server_Sleep,
|
|
AST_Server_Sleep,
|
|
Asynchronous_Hold,
|
|
Interrupt_Server_Blocked_On_Event_Flag,
|
|
Activating,
|
|
Acceptor_Delay_Sleep
|
|
};
|
|
|
|
/* A short description corresponding to each possible task state. */
|
|
static const char *task_states[] = {
|
|
N_("Unactivated"),
|
|
N_("Runnable"),
|
|
N_("Terminated"),
|
|
N_("Child Activation Wait"),
|
|
N_("Accept or Select Term"),
|
|
N_("Waiting on entry call"),
|
|
N_("Async Select Wait"),
|
|
N_("Delay Sleep"),
|
|
N_("Child Termination Wait"),
|
|
N_("Wait Child in Term Alt"),
|
|
"",
|
|
"",
|
|
"",
|
|
"",
|
|
N_("Asynchronous Hold"),
|
|
"",
|
|
N_("Activating"),
|
|
N_("Selective Wait")
|
|
};
|
|
|
|
/* A longer description corresponding to each possible task state. */
|
|
static const char *long_task_states[] = {
|
|
N_("Unactivated"),
|
|
N_("Runnable"),
|
|
N_("Terminated"),
|
|
N_("Waiting for child activation"),
|
|
N_("Blocked in accept or select with terminate"),
|
|
N_("Waiting on entry call"),
|
|
N_("Asynchronous Selective Wait"),
|
|
N_("Delay Sleep"),
|
|
N_("Waiting for children termination"),
|
|
N_("Waiting for children in terminate alternative"),
|
|
"",
|
|
"",
|
|
"",
|
|
"",
|
|
N_("Asynchronous Hold"),
|
|
"",
|
|
N_("Activating"),
|
|
N_("Blocked in selective wait statement")
|
|
};
|
|
|
|
/* The index of certain important fields in the Ada Task Control Block
|
|
record and sub-records. */
|
|
|
|
struct tcb_fieldnos
|
|
{
|
|
/* Fields in record Ada_Task_Control_Block. */
|
|
int common;
|
|
int entry_calls;
|
|
int atc_nesting_level;
|
|
|
|
/* Fields in record Common_ATCB. */
|
|
int state;
|
|
int parent;
|
|
int priority;
|
|
int image;
|
|
int image_len; /* This field may be missing. */
|
|
int call;
|
|
int ll;
|
|
|
|
/* Fields in Task_Primitives.Private_Data. */
|
|
int ll_thread;
|
|
int ll_lwp; /* This field may be missing. */
|
|
|
|
/* Fields in Common_ATCB.Call.all. */
|
|
int call_self;
|
|
};
|
|
|
|
/* The type description for the ATCB record and subrecords, and
|
|
the associated tcb_fieldnos. For efficiency reasons, these are made
|
|
static globals so that we can compute them only once the first time
|
|
and reuse them later. Set to NULL if the types haven't been computed
|
|
yet, or if they may be obsolete (for instance after having loaded
|
|
a new binary). */
|
|
|
|
static struct type *atcb_type = NULL;
|
|
static struct type *atcb_common_type = NULL;
|
|
static struct type *atcb_ll_type = NULL;
|
|
static struct type *atcb_call_type = NULL;
|
|
static struct tcb_fieldnos fieldno;
|
|
|
|
/* Set to 1 when the cached address of System.Tasking.Debug.Known_Tasks
|
|
might be stale and so needs to be recomputed. */
|
|
static int ada_tasks_check_symbol_table = 1;
|
|
|
|
/* The list of Ada tasks.
|
|
|
|
Note: To each task we associate a number that the user can use to
|
|
reference it - this number is printed beside each task in the tasks
|
|
info listing displayed by "info tasks". This number is equal to
|
|
its index in the vector + 1. Reciprocally, to compute the index
|
|
of a task in the vector, we need to substract 1 from its number. */
|
|
typedef struct ada_task_info ada_task_info_s;
|
|
DEF_VEC_O(ada_task_info_s);
|
|
static VEC(ada_task_info_s) *task_list = NULL;
|
|
|
|
/* When non-zero, this flag indicates that the current task_list
|
|
is obsolete, and should be recomputed before it is accessed. */
|
|
static int stale_task_list_p = 1;
|
|
|
|
/* Return the task number of the task whose ptid is PTID, or zero
|
|
if the task could not be found. */
|
|
|
|
int
|
|
ada_get_task_number (ptid_t ptid)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < VEC_length (ada_task_info_s, task_list); i++)
|
|
if (ptid_equal (VEC_index (ada_task_info_s, task_list, i)->ptid, ptid))
|
|
return i + 1;
|
|
|
|
return 0; /* No matching task found. */
|
|
}
|
|
|
|
/* Return the task number of the task that matches TASK_ID, or zero
|
|
if the task could not be found. */
|
|
|
|
static int
|
|
get_task_number_from_id (CORE_ADDR task_id)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VEC_length (ada_task_info_s, task_list); i++)
|
|
{
|
|
struct ada_task_info *task_info =
|
|
VEC_index (ada_task_info_s, task_list, i);
|
|
|
|
if (task_info->task_id == task_id)
|
|
return i + 1;
|
|
}
|
|
|
|
/* Task not found. Return 0. */
|
|
return 0;
|
|
}
|
|
|
|
/* Return non-zero if TASK_NUM is a valid task number. */
|
|
|
|
int
|
|
valid_task_id (int task_num)
|
|
{
|
|
ada_build_task_list (0);
|
|
return (task_num > 0
|
|
&& task_num <= VEC_length (ada_task_info_s, task_list));
|
|
}
|
|
|
|
/* Return non-zero iff the task STATE corresponds to a non-terminated
|
|
task state. */
|
|
|
|
static int
|
|
ada_task_is_alive (struct ada_task_info *task_info)
|
|
{
|
|
return (task_info->state != Terminated);
|
|
}
|
|
|
|
/* Call the ITERATOR function once for each Ada task that hasn't been
|
|
terminated yet. */
|
|
|
|
void
|
|
iterate_over_live_ada_tasks (ada_task_list_iterator_ftype *iterator)
|
|
{
|
|
int i, nb_tasks;
|
|
struct ada_task_info *task;
|
|
|
|
ada_build_task_list (0);
|
|
nb_tasks = VEC_length (ada_task_info_s, task_list);
|
|
|
|
for (i = 0; i < nb_tasks; i++)
|
|
{
|
|
task = VEC_index (ada_task_info_s, task_list, i);
|
|
if (!ada_task_is_alive (task))
|
|
continue;
|
|
iterator (task);
|
|
}
|
|
}
|
|
|
|
/* Extract the contents of the value as a string whose length is LENGTH,
|
|
and store the result in DEST. */
|
|
|
|
static void
|
|
value_as_string (char *dest, struct value *val, int length)
|
|
{
|
|
memcpy (dest, value_contents (val), length);
|
|
dest[length] = '\0';
|
|
}
|
|
|
|
/* Extract the string image from the fat string corresponding to VAL,
|
|
and store it in DEST. If the string length is greater than MAX_LEN,
|
|
then truncate the result to the first MAX_LEN characters of the fat
|
|
string. */
|
|
|
|
static void
|
|
read_fat_string_value (char *dest, struct value *val, int max_len)
|
|
{
|
|
struct value *array_val;
|
|
struct value *bounds_val;
|
|
int len;
|
|
|
|
/* The following variables are made static to avoid recomputing them
|
|
each time this function is called. */
|
|
static int initialize_fieldnos = 1;
|
|
static int array_fieldno;
|
|
static int bounds_fieldno;
|
|
static int upper_bound_fieldno;
|
|
|
|
/* Get the index of the fields that we will need to read in order
|
|
to extract the string from the fat string. */
|
|
if (initialize_fieldnos)
|
|
{
|
|
struct type *type = value_type (val);
|
|
struct type *bounds_type;
|
|
|
|
array_fieldno = ada_get_field_index (type, "P_ARRAY", 0);
|
|
bounds_fieldno = ada_get_field_index (type, "P_BOUNDS", 0);
|
|
|
|
bounds_type = TYPE_FIELD_TYPE (type, bounds_fieldno);
|
|
if (TYPE_CODE (bounds_type) == TYPE_CODE_PTR)
|
|
bounds_type = TYPE_TARGET_TYPE (bounds_type);
|
|
if (TYPE_CODE (bounds_type) != TYPE_CODE_STRUCT)
|
|
error (_("Unknown task name format. Aborting"));
|
|
upper_bound_fieldno = ada_get_field_index (bounds_type, "UB0", 0);
|
|
|
|
initialize_fieldnos = 0;
|
|
}
|
|
|
|
/* Get the size of the task image by checking the value of the bounds.
|
|
The lower bound is always 1, so we only need to read the upper bound. */
|
|
bounds_val = value_ind (value_field (val, bounds_fieldno));
|
|
len = value_as_long (value_field (bounds_val, upper_bound_fieldno));
|
|
|
|
/* Make sure that we do not read more than max_len characters... */
|
|
if (len > max_len)
|
|
len = max_len;
|
|
|
|
/* Extract LEN characters from the fat string. */
|
|
array_val = value_ind (value_field (val, array_fieldno));
|
|
read_memory (value_address (array_val), dest, len);
|
|
|
|
/* Add the NUL character to close the string. */
|
|
dest[len] = '\0';
|
|
}
|
|
|
|
/* Return the address of the Known_Tasks array maintained in
|
|
the Ada Runtime. Return NULL if the array could not be found,
|
|
meaning that the inferior program probably does not use tasking.
|
|
|
|
In order to provide a fast response time, this function caches
|
|
the Known_Tasks array address after the lookup during the first
|
|
call. Subsequent calls will simply return this cached address. */
|
|
|
|
static CORE_ADDR
|
|
get_known_tasks_addr (void)
|
|
{
|
|
static CORE_ADDR known_tasks_addr = 0;
|
|
|
|
if (ada_tasks_check_symbol_table)
|
|
{
|
|
struct minimal_symbol *msym;
|
|
|
|
msym = lookup_minimal_symbol (KNOWN_TASKS_NAME, NULL, NULL);
|
|
if (msym != NULL)
|
|
known_tasks_addr = SYMBOL_VALUE_ADDRESS (msym);
|
|
else
|
|
{
|
|
if (target_lookup_symbol (KNOWN_TASKS_NAME, &known_tasks_addr) != 0)
|
|
return 0;
|
|
}
|
|
|
|
/* FIXME: brobecker 2003-03-05: Here would be a much better place
|
|
to attach the ada-tasks observers, instead of doing this
|
|
unconditionaly in _initialize_tasks. This would avoid an
|
|
unecessary notification when the inferior does not use tasking
|
|
or as long as the user does not use the ada-tasks commands.
|
|
Unfortunately, this is not possible for the moment: the current
|
|
code resets ada__tasks_check_symbol_table back to 1 whenever
|
|
symbols for a new program are being loaded. If we place the
|
|
observers intialization here, we will end up adding new observers
|
|
everytime we do the check for Ada tasking-related symbols
|
|
above. This would currently have benign effects, but is still
|
|
undesirable. The cleanest approach is probably to create a new
|
|
observer to notify us when the user is debugging a new program.
|
|
We would then reset ada__tasks_check_symbol_table back to 1
|
|
during the notification, but also detach all observers.
|
|
BTW: observers are probably not reentrant, so detaching during
|
|
a notification may not be the safest thing to do... Sigh...
|
|
But creating the new observer would be a good idea in any case,
|
|
since this allow us to make ada__tasks_check_symbol_table
|
|
static, which is a good bonus. */
|
|
ada_tasks_check_symbol_table = 0;
|
|
}
|
|
|
|
return known_tasks_addr;
|
|
}
|
|
|
|
/* Get from the debugging information the type description of all types
|
|
related to the Ada Task Control Block that will be needed in order to
|
|
read the list of known tasks in the Ada runtime. Also return the
|
|
associated ATCB_FIELDNOS.
|
|
|
|
Error handling: Any data missing from the debugging info will cause
|
|
an error to be raised, and none of the return values to be set.
|
|
Users of this function can depend on the fact that all or none of the
|
|
return values will be set. */
|
|
|
|
static void
|
|
get_tcb_types_info (struct type **atcb_type,
|
|
struct type **atcb_common_type,
|
|
struct type **atcb_ll_type,
|
|
struct type **atcb_call_type,
|
|
struct tcb_fieldnos *atcb_fieldnos)
|
|
{
|
|
struct type *type;
|
|
struct type *common_type;
|
|
struct type *ll_type;
|
|
struct type *call_type;
|
|
struct tcb_fieldnos fieldnos;
|
|
|
|
const char *atcb_name = "system__tasking__ada_task_control_block___XVE";
|
|
const char *atcb_name_fixed = "system__tasking__ada_task_control_block";
|
|
const char *common_atcb_name = "system__tasking__common_atcb";
|
|
const char *private_data_name = "system__task_primitives__private_data";
|
|
const char *entry_call_record_name = "system__tasking__entry_call_record";
|
|
|
|
/* ATCB symbols may be found in several compilation units. As we
|
|
are only interested in one instance, use standard (literal,
|
|
C-like) lookups to get the first match. */
|
|
|
|
struct symbol *atcb_sym =
|
|
lookup_symbol_in_language (atcb_name, NULL, VAR_DOMAIN,
|
|
language_c, NULL);
|
|
const struct symbol *common_atcb_sym =
|
|
lookup_symbol_in_language (common_atcb_name, NULL, VAR_DOMAIN,
|
|
language_c, NULL);
|
|
const struct symbol *private_data_sym =
|
|
lookup_symbol_in_language (private_data_name, NULL, VAR_DOMAIN,
|
|
language_c, NULL);
|
|
const struct symbol *entry_call_record_sym =
|
|
lookup_symbol_in_language (entry_call_record_name, NULL, VAR_DOMAIN,
|
|
language_c, NULL);
|
|
|
|
if (atcb_sym == NULL || atcb_sym->type == NULL)
|
|
{
|
|
/* In Ravenscar run-time libs, the ATCB does not have a dynamic
|
|
size, so the symbol name differs. */
|
|
atcb_sym = lookup_symbol_in_language (atcb_name_fixed, NULL, VAR_DOMAIN,
|
|
language_c, NULL);
|
|
|
|
if (atcb_sym == NULL || atcb_sym->type == NULL)
|
|
error (_("Cannot find Ada_Task_Control_Block type. Aborting"));
|
|
|
|
type = atcb_sym->type;
|
|
}
|
|
else
|
|
{
|
|
/* Get a static representation of the type record
|
|
Ada_Task_Control_Block. */
|
|
type = atcb_sym->type;
|
|
type = ada_template_to_fixed_record_type_1 (type, NULL, 0, NULL, 0);
|
|
}
|
|
|
|
if (common_atcb_sym == NULL || common_atcb_sym->type == NULL)
|
|
error (_("Cannot find Common_ATCB type. Aborting"));
|
|
if (private_data_sym == NULL || private_data_sym->type == NULL)
|
|
error (_("Cannot find Private_Data type. Aborting"));
|
|
if (entry_call_record_sym == NULL || entry_call_record_sym->type == NULL)
|
|
error (_("Cannot find Entry_Call_Record type. Aborting"));
|
|
|
|
/* Get the type for Ada_Task_Control_Block.Common. */
|
|
common_type = common_atcb_sym->type;
|
|
|
|
/* Get the type for Ada_Task_Control_Bloc.Common.Call.LL. */
|
|
ll_type = private_data_sym->type;
|
|
|
|
/* Get the type for Common_ATCB.Call.all. */
|
|
call_type = entry_call_record_sym->type;
|
|
|
|
/* Get the field indices. */
|
|
fieldnos.common = ada_get_field_index (type, "common", 0);
|
|
fieldnos.entry_calls = ada_get_field_index (type, "entry_calls", 1);
|
|
fieldnos.atc_nesting_level =
|
|
ada_get_field_index (type, "atc_nesting_level", 1);
|
|
fieldnos.state = ada_get_field_index (common_type, "state", 0);
|
|
fieldnos.parent = ada_get_field_index (common_type, "parent", 1);
|
|
fieldnos.priority = ada_get_field_index (common_type, "base_priority", 0);
|
|
fieldnos.image = ada_get_field_index (common_type, "task_image", 1);
|
|
fieldnos.image_len = ada_get_field_index (common_type, "task_image_len", 1);
|
|
fieldnos.call = ada_get_field_index (common_type, "call", 1);
|
|
fieldnos.ll = ada_get_field_index (common_type, "ll", 0);
|
|
fieldnos.ll_thread = ada_get_field_index (ll_type, "thread", 0);
|
|
fieldnos.ll_lwp = ada_get_field_index (ll_type, "lwp", 1);
|
|
fieldnos.call_self = ada_get_field_index (call_type, "self", 0);
|
|
|
|
/* On certain platforms such as x86-windows, the "lwp" field has been
|
|
named "thread_id". This field will likely be renamed in the future,
|
|
but we need to support both possibilities to avoid an unnecessary
|
|
dependency on a recent compiler. We therefore try locating the
|
|
"thread_id" field in place of the "lwp" field if we did not find
|
|
the latter. */
|
|
if (fieldnos.ll_lwp < 0)
|
|
fieldnos.ll_lwp = ada_get_field_index (ll_type, "thread_id", 1);
|
|
|
|
/* Set all the out parameters all at once, now that we are certain
|
|
that there are no potential error() anymore. */
|
|
*atcb_type = type;
|
|
*atcb_common_type = common_type;
|
|
*atcb_ll_type = ll_type;
|
|
*atcb_call_type = call_type;
|
|
*atcb_fieldnos = fieldnos;
|
|
}
|
|
|
|
/* Build the PTID of the task from its COMMON_VALUE, which is the "Common"
|
|
component of its ATCB record. This PTID needs to match the PTID used
|
|
by the thread layer. */
|
|
|
|
static ptid_t
|
|
ptid_from_atcb_common (struct value *common_value)
|
|
{
|
|
long thread = 0;
|
|
CORE_ADDR lwp = 0;
|
|
struct value *ll_value;
|
|
ptid_t ptid;
|
|
|
|
ll_value = value_field (common_value, fieldno.ll);
|
|
|
|
if (fieldno.ll_lwp >= 0)
|
|
lwp = value_as_address (value_field (ll_value, fieldno.ll_lwp));
|
|
thread = value_as_long (value_field (ll_value, fieldno.ll_thread));
|
|
|
|
ptid = target_get_ada_task_ptid (lwp, thread);
|
|
|
|
return ptid;
|
|
}
|
|
|
|
/* Read the ATCB data of a given task given its TASK_ID (which is in practice
|
|
the address of its assocated ATCB record), and store the result inside
|
|
TASK_INFO. */
|
|
|
|
static void
|
|
read_atcb (CORE_ADDR task_id, struct ada_task_info *task_info)
|
|
{
|
|
struct value *tcb_value;
|
|
struct value *common_value;
|
|
struct value *atc_nesting_level_value;
|
|
struct value *entry_calls_value;
|
|
struct value *entry_calls_value_element;
|
|
int called_task_fieldno = -1;
|
|
const char ravenscar_task_name[] = "Ravenscar task";
|
|
|
|
if (atcb_type == NULL)
|
|
get_tcb_types_info (&atcb_type, &atcb_common_type, &atcb_ll_type,
|
|
&atcb_call_type, &fieldno);
|
|
|
|
tcb_value = value_from_contents_and_address (atcb_type, NULL, task_id);
|
|
common_value = value_field (tcb_value, fieldno.common);
|
|
|
|
/* Fill in the task_id. */
|
|
|
|
task_info->task_id = task_id;
|
|
|
|
/* Compute the name of the task.
|
|
|
|
Depending on the GNAT version used, the task image is either a fat
|
|
string, or a thin array of characters. Older versions of GNAT used
|
|
to use fat strings, and therefore did not need an extra field in
|
|
the ATCB to store the string length. For efficiency reasons, newer
|
|
versions of GNAT replaced the fat string by a static buffer, but this
|
|
also required the addition of a new field named "Image_Len" containing
|
|
the length of the task name. The method used to extract the task name
|
|
is selected depending on the existence of this field.
|
|
|
|
In some run-time libs (e.g. Ravenscar), the name is not in the ATCB;
|
|
we may want to get it from the first user frame of the stack. For now,
|
|
we just give a dummy name. */
|
|
|
|
if (fieldno.image_len == -1)
|
|
{
|
|
if (fieldno.image >= 0)
|
|
read_fat_string_value (task_info->name,
|
|
value_field (common_value, fieldno.image),
|
|
sizeof (task_info->name) - 1);
|
|
else
|
|
strcpy (task_info->name, ravenscar_task_name);
|
|
}
|
|
else
|
|
{
|
|
int len = value_as_long (value_field (common_value, fieldno.image_len));
|
|
|
|
value_as_string (task_info->name,
|
|
value_field (common_value, fieldno.image), len);
|
|
}
|
|
|
|
/* Compute the task state and priority. */
|
|
|
|
task_info->state = value_as_long (value_field (common_value, fieldno.state));
|
|
task_info->priority =
|
|
value_as_long (value_field (common_value, fieldno.priority));
|
|
|
|
/* If the ATCB contains some information about the parent task,
|
|
then compute it as well. Otherwise, zero. */
|
|
|
|
if (fieldno.parent >= 0)
|
|
task_info->parent =
|
|
value_as_address (value_field (common_value, fieldno.parent));
|
|
else
|
|
task_info->parent = 0;
|
|
|
|
|
|
/* If the ATCB contains some information about entry calls, then
|
|
compute the "called_task" as well. Otherwise, zero. */
|
|
|
|
if (fieldno.atc_nesting_level > 0 && fieldno.entry_calls > 0)
|
|
{
|
|
/* Let My_ATCB be the Ada task control block of a task calling the
|
|
entry of another task; then the Task_Id of the called task is
|
|
in My_ATCB.Entry_Calls (My_ATCB.ATC_Nesting_Level).Called_Task. */
|
|
atc_nesting_level_value = value_field (tcb_value,
|
|
fieldno.atc_nesting_level);
|
|
entry_calls_value =
|
|
ada_coerce_to_simple_array_ptr (value_field (tcb_value,
|
|
fieldno.entry_calls));
|
|
entry_calls_value_element =
|
|
value_subscript (entry_calls_value,
|
|
value_as_long (atc_nesting_level_value));
|
|
called_task_fieldno =
|
|
ada_get_field_index (value_type (entry_calls_value_element),
|
|
"called_task", 0);
|
|
task_info->called_task =
|
|
value_as_address (value_field (entry_calls_value_element,
|
|
called_task_fieldno));
|
|
}
|
|
else
|
|
{
|
|
task_info->called_task = 0;
|
|
}
|
|
|
|
/* If the ATCB cotnains some information about RV callers,
|
|
then compute the "caller_task". Otherwise, zero. */
|
|
|
|
task_info->caller_task = 0;
|
|
if (fieldno.call >= 0)
|
|
{
|
|
/* Get the ID of the caller task from Common_ATCB.Call.all.Self.
|
|
If Common_ATCB.Call is null, then there is no caller. */
|
|
const CORE_ADDR call =
|
|
value_as_address (value_field (common_value, fieldno.call));
|
|
struct value *call_val;
|
|
|
|
if (call != 0)
|
|
{
|
|
call_val =
|
|
value_from_contents_and_address (atcb_call_type, NULL, call);
|
|
task_info->caller_task =
|
|
value_as_address (value_field (call_val, fieldno.call_self));
|
|
}
|
|
}
|
|
|
|
/* And finally, compute the task ptid. Note that there are situations
|
|
where this cannot be determined:
|
|
- The task is no longer alive - the ptid is irrelevant;
|
|
- We are debugging a core file - the thread is not always
|
|
completely preserved for us to link back a task to its
|
|
underlying thread. Since we do not support task switching
|
|
when debugging core files anyway, we don't need to compute
|
|
that task ptid.
|
|
In either case, we don't need that ptid, and it is just good enough
|
|
to set it to null_ptid. */
|
|
|
|
if (target_has_execution && ada_task_is_alive (task_info))
|
|
task_info->ptid = ptid_from_atcb_common (common_value);
|
|
else
|
|
task_info->ptid = null_ptid;
|
|
}
|
|
|
|
/* Read the ATCB info of the given task (identified by TASK_ID), and
|
|
add the result to the TASK_LIST. */
|
|
|
|
static void
|
|
add_ada_task (CORE_ADDR task_id)
|
|
{
|
|
struct ada_task_info task_info;
|
|
|
|
read_atcb (task_id, &task_info);
|
|
VEC_safe_push (ada_task_info_s, task_list, &task_info);
|
|
}
|
|
|
|
/* Read the Known_Tasks array from the inferior memory, and store
|
|
it in TASK_LIST. Return non-zero upon success. */
|
|
|
|
static int
|
|
read_known_tasks_array (void)
|
|
{
|
|
const int target_ptr_byte =
|
|
gdbarch_ptr_bit (target_gdbarch) / TARGET_CHAR_BIT;
|
|
const CORE_ADDR known_tasks_addr = get_known_tasks_addr ();
|
|
const int known_tasks_size = target_ptr_byte * MAX_NUMBER_OF_KNOWN_TASKS;
|
|
gdb_byte *known_tasks = alloca (known_tasks_size);
|
|
int i;
|
|
|
|
/* Step 1: Clear the current list, if necessary. */
|
|
VEC_truncate (ada_task_info_s, task_list, 0);
|
|
|
|
/* If the application does not use task, then no more needs to be done.
|
|
It is important to have the task list cleared (see above) before we
|
|
return, as we don't want a stale task list to be used... This can
|
|
happen for instance when debugging a non-multitasking program after
|
|
having debugged a multitasking one. */
|
|
if (known_tasks_addr == 0)
|
|
return 0;
|
|
|
|
/* Step 2: Build a new list by reading the ATCBs from the Known_Tasks
|
|
array in the Ada runtime. */
|
|
read_memory (known_tasks_addr, known_tasks, known_tasks_size);
|
|
for (i = 0; i < MAX_NUMBER_OF_KNOWN_TASKS; i++)
|
|
{
|
|
struct type *data_ptr_type =
|
|
builtin_type (target_gdbarch)->builtin_data_ptr;
|
|
CORE_ADDR task_id =
|
|
extract_typed_address (known_tasks + i * target_ptr_byte,
|
|
data_ptr_type);
|
|
|
|
if (task_id != 0)
|
|
add_ada_task (task_id);
|
|
}
|
|
|
|
/* Step 3: Unset stale_task_list_p, to avoid re-reading the Known_Tasks
|
|
array unless needed. Then report a success. */
|
|
stale_task_list_p = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Builds the task_list by reading the Known_Tasks array from
|
|
the inferior. Prints an appropriate message and returns non-zero
|
|
if it failed to build this list. */
|
|
|
|
int
|
|
ada_build_task_list (int warn_if_null)
|
|
{
|
|
if (!target_has_stack)
|
|
error (_("Cannot inspect Ada tasks when program is not running"));
|
|
|
|
if (stale_task_list_p)
|
|
read_known_tasks_array ();
|
|
|
|
if (task_list == NULL)
|
|
{
|
|
if (warn_if_null)
|
|
printf_filtered (_("Your application does not use any Ada tasks.\n"));
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Print a one-line description of the task whose number is TASKNO.
|
|
The formatting should fit the "info tasks" array. */
|
|
|
|
static void
|
|
short_task_info (int taskno)
|
|
{
|
|
const struct ada_task_info *const task_info =
|
|
VEC_index (ada_task_info_s, task_list, taskno - 1);
|
|
int active_task_p;
|
|
|
|
gdb_assert (task_info != NULL);
|
|
|
|
/* Print a star if this task is the current task (or the task currently
|
|
selected). */
|
|
|
|
active_task_p = ptid_equal (task_info->ptid, inferior_ptid);
|
|
if (active_task_p)
|
|
printf_filtered ("*");
|
|
else
|
|
printf_filtered (" ");
|
|
|
|
/* Print the task number. */
|
|
printf_filtered ("%3d", taskno);
|
|
|
|
/* Print the Task ID. */
|
|
printf_filtered (" %9lx", (long) task_info->task_id);
|
|
|
|
/* Print the Task ID of the task parent. */
|
|
printf_filtered (" %4d", get_task_number_from_id (task_info->parent));
|
|
|
|
/* Print the base priority of the task. */
|
|
printf_filtered (" %3d", task_info->priority);
|
|
|
|
/* Print the task current state. */
|
|
if (task_info->caller_task)
|
|
printf_filtered (_(" Accepting RV with %-4d"),
|
|
get_task_number_from_id (task_info->caller_task));
|
|
else if (task_info->state == Entry_Caller_Sleep && task_info->called_task)
|
|
printf_filtered (_(" Waiting on RV with %-3d"),
|
|
get_task_number_from_id (task_info->called_task));
|
|
else
|
|
printf_filtered (" %-22s", _(task_states[task_info->state]));
|
|
|
|
/* Finally, print the task name. */
|
|
if (task_info->name[0] != '\0')
|
|
printf_filtered (" %s\n", task_info->name);
|
|
else
|
|
printf_filtered (_(" <no name>\n"));
|
|
}
|
|
|
|
/* Print a list containing a short description of all Ada tasks. */
|
|
/* FIXME: Shouldn't we be using ui_out??? */
|
|
|
|
static void
|
|
info_tasks (int from_tty)
|
|
{
|
|
int taskno;
|
|
const int nb_tasks = VEC_length (ada_task_info_s, task_list);
|
|
|
|
printf_filtered (_(" ID TID P-ID Pri State Name\n"));
|
|
|
|
for (taskno = 1; taskno <= nb_tasks; taskno++)
|
|
short_task_info (taskno);
|
|
}
|
|
|
|
/* Print a detailed description of the Ada task whose ID is TASKNO_STR. */
|
|
|
|
static void
|
|
info_task (char *taskno_str, int from_tty)
|
|
{
|
|
const int taskno = value_as_long (parse_and_eval (taskno_str));
|
|
struct ada_task_info *task_info;
|
|
int parent_taskno = 0;
|
|
|
|
if (taskno <= 0 || taskno > VEC_length (ada_task_info_s, task_list))
|
|
error (_("Task ID %d not known. Use the \"info tasks\" command to\n"
|
|
"see the IDs of currently known tasks"), taskno);
|
|
task_info = VEC_index (ada_task_info_s, task_list, taskno - 1);
|
|
|
|
/* Print the Ada task ID. */
|
|
printf_filtered (_("Ada Task: %s\n"),
|
|
paddress (target_gdbarch, task_info->task_id));
|
|
|
|
/* Print the name of the task. */
|
|
if (task_info->name[0] != '\0')
|
|
printf_filtered (_("Name: %s\n"), task_info->name);
|
|
else
|
|
printf_filtered (_("<no name>\n"));
|
|
|
|
/* Print the TID and LWP. */
|
|
printf_filtered (_("Thread: %#lx\n"), ptid_get_tid (task_info->ptid));
|
|
printf_filtered (_("LWP: %#lx\n"), ptid_get_lwp (task_info->ptid));
|
|
|
|
/* Print who is the parent (if any). */
|
|
if (task_info->parent != 0)
|
|
parent_taskno = get_task_number_from_id (task_info->parent);
|
|
if (parent_taskno)
|
|
{
|
|
struct ada_task_info *parent =
|
|
VEC_index (ada_task_info_s, task_list, parent_taskno - 1);
|
|
|
|
printf_filtered (_("Parent: %d"), parent_taskno);
|
|
if (parent->name[0] != '\0')
|
|
printf_filtered (" (%s)", parent->name);
|
|
printf_filtered ("\n");
|
|
}
|
|
else
|
|
printf_filtered (_("No parent\n"));
|
|
|
|
/* Print the base priority. */
|
|
printf_filtered (_("Base Priority: %d\n"), task_info->priority);
|
|
|
|
/* print the task current state. */
|
|
{
|
|
int target_taskno = 0;
|
|
|
|
if (task_info->caller_task)
|
|
{
|
|
target_taskno = get_task_number_from_id (task_info->caller_task);
|
|
printf_filtered (_("State: Accepting rendezvous with %d"),
|
|
target_taskno);
|
|
}
|
|
else if (task_info->state == Entry_Caller_Sleep && task_info->called_task)
|
|
{
|
|
target_taskno = get_task_number_from_id (task_info->called_task);
|
|
printf_filtered (_("State: Waiting on task %d's entry"),
|
|
target_taskno);
|
|
}
|
|
else
|
|
printf_filtered (_("State: %s"), _(long_task_states[task_info->state]));
|
|
|
|
if (target_taskno)
|
|
{
|
|
struct ada_task_info *target_task_info =
|
|
VEC_index (ada_task_info_s, task_list, target_taskno - 1);
|
|
|
|
if (target_task_info->name[0] != '\0')
|
|
printf_filtered (" (%s)", target_task_info->name);
|
|
}
|
|
|
|
printf_filtered ("\n");
|
|
}
|
|
}
|
|
|
|
/* If ARG is empty or null, then print a list of all Ada tasks.
|
|
Otherwise, print detailed information about the task whose ID
|
|
is ARG.
|
|
|
|
Does nothing if the program doesn't use Ada tasking. */
|
|
|
|
static void
|
|
info_tasks_command (char *arg, int from_tty)
|
|
{
|
|
const int task_list_built = ada_build_task_list (1);
|
|
|
|
if (!task_list_built)
|
|
return;
|
|
|
|
if (arg == NULL || *arg == '\0')
|
|
info_tasks (from_tty);
|
|
else
|
|
info_task (arg, from_tty);
|
|
}
|
|
|
|
/* Print a message telling the user id of the current task.
|
|
This function assumes that tasking is in use in the inferior. */
|
|
|
|
static void
|
|
display_current_task_id (void)
|
|
{
|
|
const int current_task = ada_get_task_number (inferior_ptid);
|
|
|
|
if (current_task == 0)
|
|
printf_filtered (_("[Current task is unknown]\n"));
|
|
else
|
|
printf_filtered (_("[Current task is %d]\n"), current_task);
|
|
}
|
|
|
|
/* Parse and evaluate TIDSTR into a task id, and try to switch to
|
|
that task. Print an error message if the task switch failed. */
|
|
|
|
static void
|
|
task_command_1 (char *taskno_str, int from_tty)
|
|
{
|
|
const int taskno = value_as_long (parse_and_eval (taskno_str));
|
|
struct ada_task_info *task_info;
|
|
|
|
if (taskno <= 0 || taskno > VEC_length (ada_task_info_s, task_list))
|
|
error (_("Task ID %d not known. Use the \"info tasks\" command to\n"
|
|
"see the IDs of currently known tasks"), taskno);
|
|
task_info = VEC_index (ada_task_info_s, task_list, taskno - 1);
|
|
|
|
if (!ada_task_is_alive (task_info))
|
|
error (_("Cannot switch to task %d: Task is no longer running"), taskno);
|
|
|
|
/* On some platforms, the thread list is not updated until the user
|
|
performs a thread-related operation (by using the "info threads"
|
|
command, for instance). So this thread list may not be up to date
|
|
when the user attempts this task switch. Since we cannot switch
|
|
to the thread associated to our task if GDB does not know about
|
|
that thread, we need to make sure that any new threads gets added
|
|
to the thread list. */
|
|
target_find_new_threads ();
|
|
|
|
/* Verify that the ptid of the task we want to switch to is valid
|
|
(in other words, a ptid that GDB knows about). Otherwise, we will
|
|
cause an assertion failure later on, when we try to determine
|
|
the ptid associated thread_info data. We should normally never
|
|
encounter such an error, but the wrong ptid can actually easily be
|
|
computed if target_get_ada_task_ptid has not been implemented for
|
|
our target (yet). Rather than cause an assertion error in that case,
|
|
it's nicer for the user to just refuse to perform the task switch. */
|
|
if (!find_thread_ptid (task_info->ptid))
|
|
error (_("Unable to compute thread ID for task %d.\n"
|
|
"Cannot switch to this task."),
|
|
taskno);
|
|
|
|
switch_to_thread (task_info->ptid);
|
|
ada_find_printable_frame (get_selected_frame (NULL));
|
|
printf_filtered (_("[Switching to task %d]\n"), taskno);
|
|
print_stack_frame (get_selected_frame (NULL),
|
|
frame_relative_level (get_selected_frame (NULL)), 1);
|
|
}
|
|
|
|
|
|
/* Print the ID of the current task if TASKNO_STR is empty or NULL.
|
|
Otherwise, switch to the task indicated by TASKNO_STR. */
|
|
|
|
static void
|
|
task_command (char *taskno_str, int from_tty)
|
|
{
|
|
const int task_list_built = ada_build_task_list (1);
|
|
|
|
if (!task_list_built)
|
|
return;
|
|
|
|
if (taskno_str == NULL || taskno_str[0] == '\0')
|
|
display_current_task_id ();
|
|
else
|
|
{
|
|
/* Task switching in core files doesn't work, either because:
|
|
1. Thread support is not implemented with core files
|
|
2. Thread support is implemented, but the thread IDs created
|
|
after having read the core file are not the same as the ones
|
|
that were used during the program life, before the crash.
|
|
As a consequence, there is no longer a way for the debugger
|
|
to find the associated thead ID of any given Ada task.
|
|
So, instead of attempting a task switch without giving the user
|
|
any clue as to what might have happened, just error-out with
|
|
a message explaining that this feature is not supported. */
|
|
if (!target_has_execution)
|
|
error (_("\
|
|
Task switching not supported when debugging from core files\n\
|
|
(use thread support instead)"));
|
|
task_command_1 (taskno_str, from_tty);
|
|
}
|
|
}
|
|
|
|
/* Indicate that the task list may have changed, so invalidate the cache. */
|
|
|
|
static void
|
|
ada_task_list_changed (void)
|
|
{
|
|
stale_task_list_p = 1;
|
|
}
|
|
|
|
/* The 'normal_stop' observer notification callback. */
|
|
|
|
static void
|
|
ada_normal_stop_observer (struct bpstats *unused_args, int unused_args2)
|
|
{
|
|
/* The inferior has been resumed, and just stopped. This means that
|
|
our task_list needs to be recomputed before it can be used again. */
|
|
ada_task_list_changed ();
|
|
}
|
|
|
|
/* A routine to be called when the objfiles have changed. */
|
|
|
|
static void
|
|
ada_new_objfile_observer (struct objfile *objfile)
|
|
{
|
|
/* Invalidate all cached data that were extracted from an objfile. */
|
|
|
|
atcb_type = NULL;
|
|
atcb_common_type = NULL;
|
|
atcb_ll_type = NULL;
|
|
atcb_call_type = NULL;
|
|
|
|
ada_tasks_check_symbol_table = 1;
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_tasks;
|
|
|
|
void
|
|
_initialize_tasks (void)
|
|
{
|
|
/* Attach various observers. */
|
|
observer_attach_normal_stop (ada_normal_stop_observer);
|
|
observer_attach_new_objfile (ada_new_objfile_observer);
|
|
|
|
/* Some new commands provided by this module. */
|
|
add_info ("tasks", info_tasks_command,
|
|
_("Provide information about all known Ada tasks"));
|
|
add_cmd ("task", class_run, task_command,
|
|
_("Use this command to switch between Ada tasks.\n\
|
|
Without argument, this command simply prints the current task ID"),
|
|
&cmdlist);
|
|
}
|
|
|