diff options
Diffstat (limited to 'gdb')
| -rw-r--r-- | gdb/ada-tasks.c | 1447 |
1 files changed, 0 insertions, 1447 deletions
diff --git a/gdb/ada-tasks.c b/gdb/ada-tasks.c deleted file mode 100644 index 88c2270..0000000 --- a/gdb/ada-tasks.c +++ /dev/null @@ -1,1447 +0,0 @@ -/* File ada-tasks.c: Ada tasking control for GDB - Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 - Free Software Foundation, Inc. - Contributed by Ada Core Technologies, Inc. - - This file is part of GDB. - - Authors: Roch-Alexandre Nomine Beguin, Arnaud Charlet <charlet@gnat.com> - - 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 2 of the License, or - (at your option) any later version. - -*/ - -#include <ctype.h> -#include <gdb_string.h> -#include "defs.h" -#include "command.h" -#include "value.h" -#include "language.h" -#include "inferior.h" -#include "symtab.h" -#include "target.h" -#include "gdbcore.h" -#include "gdbthread.h" -#include "regcache.h" /* for registers_changed */ - -#if defined (__fsu__) || defined (HAVE_SPYTHREAD) \ - || (defined(__alpha__) && defined(__osf__) && !defined(__alpha_vxworks)) -#include <sys/procfs.h> -#endif - -#if defined (__fsu__) || defined (HAVE_SPYTHREAD) \ - || (defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET)) -#include "gregset.h" -#endif - -#ifdef I386_GNULINUX_TARGET -#include "gdb_thread_db.h" -#endif - -#if defined (HAVE_SPYTHREAD) -#include "irix6-spyThread.h" -#endif - -#include "ada-lang.h" -#include "observer.h" - -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 -}; - -/* 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; - - /* 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. */ -}; - -#if defined (linux) -#define TASK_LWP(atcb) 0L -#else -#define TASK_LWP(atcb) extract_unsigned_integer (&(atcb).lwp, sizeof ((atcb).lwp)) -#endif - -/* FIXME: move all this conditional compilation in description - files or in configure.in */ - -#if defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET) -#define SPECIAL_THREAD_SUPPORT_ACTIVE() thread_support -#define SAVE_TASK_REGISTERS(task) \ - do { fill_gregset (&gregset_saved, -1); \ - fill_fpregset (&fpregset_saved, -1); \ - } while (0) -#define RESTORE_TASK_REGISTERS(task) \ - do { supply_gregset (&gregset_saved); \ - supply_fpregset (&fpregset_saved); \ - } while (0) - -#define THREAD_FETCH_REGISTERS dec_thread_fetch_registers -#define GET_CURRENT_THREAD(PTID) dec_thread_get_current_thread () -extern unsigned long dec_thread_get_current_thread (void); -extern int dec_thread_get_registers (gdb_gregset_t *, gdb_fpregset_t *); -extern int dec_thread_fetch_registers (void); -#endif - -#ifdef __fsu__ -#define SPECIAL_THREAD_SUPPORT_ACTIVE() \ - (thread_support && pthread_kern_addr != 0) -#define SAVE_TASK_REGISTERS(task) \ - do { \ - if (pthread_kern_addr != 0) \ - { \ - fill_gregset (&gregset_saved, -1); \ - fill_fpregset (&fpregset_saved, -1); \ - } \ - } while (0) -#define RESTORE_TASK_REGISTERS(task) \ - do { \ - if (pthread_kern_addr != 0) \ - { \ - supply_gregset (&gregset_saved); \ - supply_fpregset (&fpregset_saved); \ - } \ - } while (0) - -extern int fsu_thread_fetch_registers (void); -extern unsigned long fsu_thread_get_current_thread (void); -static int fsu_or_linux_thread_fetch_registers (void); -static long fsu_or_linux_thread_get_current_thread (ptid_t); -#define THREAD_FETCH_REGISTERS fsu_or_linux_thread_fetch_registers -#define GET_CURRENT_THREAD(PTID) fsu_or_linux_thread_get_current_thread (PTID) -#define PTHREAD_KERN "pthread_kern" -#endif - -#ifdef I386_GNULINUX_TARGET -extern td_thrinfo_t thread_db_pid_to_thread_info (int pid); -extern int thread_db_tid_to_pid (void *tid); -#endif - -#if defined(VXWORKS_TARGET) -#define GET_CURRENT_THREAD(PTID) (unsigned long) ptid_get_pid (PTID) -#define THREAD_FETCH_REGISTERS() (-1) - -#elif defined (__WIN32__) || defined (__CYGWIN__) || defined (hpux) -#define GET_CURRENT_THREAD(PTID) ptid_get_pid (PTID) -#define THREAD_FETCH_REGISTERS() (-1) -#endif - -#if defined (HAVE_SPYTHREAD) -#define GET_CURRENT_THREAD(PTID) (unsigned long) TIDGET (PTID) -#endif - -#if !defined(GET_CURRENT_THREAD) -#define GET_CURRENT_THREAD(PTID) (unsigned long) ptid_get_tid (PTID) -#endif - -#if !defined(THREAD_FETCH_REGISTERS) -#define THREAD_FETCH_REGISTERS() (target_fetch_registers (-1), 0) -#endif - -#if !defined(SAVE_TASK_REGISTERS) -#define SAVE_TASK_REGISTERS(task) -#define RESTORE_TASK_REGISTERS(task) -#endif - -#if !defined(SPECIAL_THREAD_SUPPORT_ACTIVE) -#define SPECIAL_THREAD_SUPPORT_ACTIVE() 0 -#endif - -#define KNOWN_TASKS_NAME "system__tasking__debug__known_tasks" - -#define READ_MEMORY(addr, var) read_memory (addr, (char *) &var, sizeof (var)) - -/* If defined to 1, means that the thread ptids maintained by core GDB - follow this format : first field (pid) contains the tid - second field (lwp) contains 0 - third field (tid) contains 0 */ -#ifndef THREAD_PTID_CONTAINS_TID_NULL_NULL -#define THREAD_PTID_CONTAINS_TID_NULL_NULL (0) -#endif - -/* If defined to 1, means that the thread ptids maintained by core GDB - follow this format: first field (pid) contains the LWP id - second field (lwp) contains 0 - third field (tid) contains 0 */ -#ifndef THREAD_PTID_CONTAINS_LWP_NULL_NULL -#define THREAD_PTID_CONTAINS_LWP_NULL_NULL (0) -#endif - -/* If defined to 1, means that the thread ptids maintained by core GDB - follow this format: first field (pid) contains the PID - second field (lwp) contains 0 - third field (tid) contains the TID */ -#ifndef THREAD_PTID_CONTAINS_PID_NULL_TID -#define THREAD_PTID_CONTAINS_PID_NULL_TID (0) -#endif - -/* If defined to 1, means that the thread ptids maintained by core GDB - follow this format: first field (pid) contains the PID - second field (lwp) contains the TID - third field (tid) contains the 0 */ - -#ifndef THREAD_PTID_CONTAINS_PID_TID_NULL -#define THREAD_PTID_CONTAINS_PID_TID_NULL (0) -#endif - -/* If defined to 1, means that the thread id is not stored in the tid - field of the task_ptid, but rather in the lwp field. */ -#ifndef ADA_THREAD_ID_IN_LWP -#define ADA_THREAD_ID_IN_LWP (0) -#endif - -static int task_ptid_get_pid (task_ptid_t task_ptid); -static long task_ptid_get_lwp (task_ptid_t task_ptid); -static long task_ptid_get_tid (task_ptid_t task_ptid); -static task_ptid_t task_ptid_build (int pid, long lwp, long tid); -static ptid_t task_ptid_get_ptid (task_ptid_t task_ptid); -static long task_ptid_get_thread_id (task_ptid_t task_ptid); - -static int task_is_alive (enum task_states state); -static CORE_ADDR get_self_id (ptid_t); -static int get_entry_number (CORE_ADDR); -static void get_tcb_types_info (struct type **atcb_type, - struct type **atcb_common_type, - struct type **atcb_ll_type, - struct tcb_fieldnos *atcb_fieldnos); -static void get_tcb_call_type_info (struct type **atcb_call_type, - int *atcb_call_self_fieldno); -static CORE_ADDR get_known_tasks_addr (void); -static int read_known_tasks_array (void); -static void value_as_string (char *dest, struct value *val, int length); -static struct task_control_block read_atcb (CORE_ADDR atcb_addr); -static CORE_ADDR read_caller (const CORE_ADDR call); -static void display_current_task_id (void); -static void task_command_1 (char *tidstr, int from_tty); - -/* Ada-tasks observers. */ - -static void normal_stop_notification (void); -static void ada_tasks_attach_observers (void); - -/* Global visible variables */ - -int ada__tasks_check_symbol_table = 1; -CORE_ADDR pthread_kern_addr = 0; -struct task_entry *task_list = NULL; - -/* Local global variables. */ - -/* 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; - -#if defined (__fsu__) || (defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET)) -gdb_gregset_t gregset_saved; -gdb_fpregset_t fpregset_saved; -#endif - -/* The maximum number of tasks known to the Ada runtime */ -static const int MAX_NUMBER_OF_KNOWN_TASKS = 1000; - -/* the current task, as seen by the user. Modified everytime the user - does a task switch. */ -static int current_task = -1; - -unsigned long current_thread; - -/* The task where the debugger stopped, giving control back to the user. - Not affected by task switching. Used to restore the registers before - continuing the inferior. */ -int current_task_id = -1; - -static char *task_states[] = { - "Unactivated", - "Runnable", - "Terminated", - "Child Activation Wait", - "Accept Statement", - "Waiting on entry call", - "Async Select Wait", - "Delay Sleep", - "Child Termination Wait", - "Wait Child in Term Alt", - "", - "", - "", - "", - "Asynchronous Hold" -}; - -/* Global internal types */ - -static char *long_task_states[] = { - "Unactivated", - "Runnable", - "Terminated", - "Waiting for child activation", - "Blocked in accept statement", - "Waiting on entry call", - "Asynchronous Selective Wait", - "Delay Sleep", - "Waiting for children termination", - "Waiting for children in terminate alternative", - "", - "", - "", - "", - "Asynchronous Hold" -}; - -/* Global internal variables */ - -static int highest_task_num = 0; -static int thread_support = 0; /* 1 if the thread library in use is - supported. FIXME: Not reinitialized - properly when program reloaded. - */ -#ifdef __fsu__ -static int -fsu_or_linux_thread_fetch_registers (void) -{ - if (pthread_kern_addr != 0) - return fsu_thread_fetch_registers (); - - target_fetch_registers (-1); - return 0L; -} - -static long -fsu_or_linux_thread_get_current_thread (ptid_t ptid) -{ - if (pthread_kern_addr != 0) - return fsu_thread_get_current_thread (); - - return ptid_get_tid (ptid); -} - -#endif /* __fsu__ */ - -static int -add_task_entry (CORE_ADDR p_task_id, int index) -{ - struct task_entry *new_task_entry = NULL; - struct task_entry *pt; - - highest_task_num++; - new_task_entry = xmalloc (sizeof (struct task_entry)); - new_task_entry->task_num = highest_task_num; - new_task_entry->task_id = p_task_id; - new_task_entry->atcb = read_atcb (p_task_id); - new_task_entry->known_tasks_index = index; - new_task_entry->task_ptid = - task_ptid_build (ptid_get_pid (inferior_ptid), /* ? */ - TASK_LWP (new_task_entry->atcb), - new_task_entry->atcb.thread); - new_task_entry->next_task = NULL; - pt = task_list; - if (pt) - { - while (pt->next_task) - pt = pt->next_task; - pt->next_task = new_task_entry; - pt->stack_per = 0; - } - else - task_list = new_task_entry; - return new_task_entry->task_num; -} - -static int -get_entry_number (CORE_ADDR p_task_id) -{ - struct task_entry *pt; - - pt = task_list; - while (pt != NULL) - { - if (pt->task_id == p_task_id) - return pt->task_num; - pt = pt->next_task; - } - return 0; -} - -static struct task_entry * -get_thread_entry_vptr (long thread) -{ - struct task_entry *pt; - - pt = task_list; - while (pt != NULL) - { - if (task_ptid_get_thread_id (pt->task_ptid) == thread) - return pt; - pt = pt->next_task; - } - return 0; -} - -static struct task_entry * -get_entry_vptr (int p_task_num) -{ - struct task_entry *pt; - - pt = task_list; - while (pt) - { - if (pt->task_num == p_task_num) - return pt; - pt = pt->next_task; - } - return NULL; -} - -void -init_task_list (void) -{ - struct task_entry *pt, *old_pt; - - target_find_new_threads (); - - pt = task_list; - while (pt) - { - old_pt = pt; - pt = pt->next_task; - xfree (old_pt); - }; - task_list = NULL; - highest_task_num = 0; -} - -int -valid_task_id (int task) -{ - return get_entry_vptr (task) != NULL; -} - -/* Return the pid of a given task ptid. */ - -static int -task_ptid_get_pid (task_ptid_t task_ptid) -{ - return task_ptid.pid; -} - -/* Return the lwp of a given task ptid. */ - -static long -task_ptid_get_lwp (task_ptid_t task_ptid) -{ - return task_ptid.lwp; -} - -/* Return the tid of a given task ptid. */ - -static long -task_ptid_get_tid (task_ptid_t task_ptid) -{ - return task_ptid.tid; -} - -/* Build a task ptid from the associated pid, lwp, and tid. */ - -static task_ptid_t -task_ptid_build (int pid, long lwp, long tid) -{ - task_ptid_t task_ptid; - - task_ptid.pid = pid; - task_ptid.lwp = lwp; - task_ptid.tid = tid; - return task_ptid; -} - -/* Translate a task ptid into a ptid (the ptid maintained by core GDB). - - On most platforms, they are equivalent, and this function can be - regarded as the identity. However, there are other platforms where - the task ptid and the ptid are not equivalent. For instance, the task - LWP value is sometimes stored by GDB-core as a pid! This translation - therefore becomes necessary before invoking the GDB thread services. */ - -static ptid_t -task_ptid_get_ptid (task_ptid_t task_ptid) -{ - ptid_t ptid; - - if (THREAD_PTID_CONTAINS_TID_NULL_NULL) - ptid = ptid_build (task_ptid_get_tid (task_ptid), 0, 0); - else if (THREAD_PTID_CONTAINS_LWP_NULL_NULL) - ptid = ptid_build (task_ptid_get_lwp (task_ptid), 0, 0); - else if (THREAD_PTID_CONTAINS_PID_NULL_TID) - ptid = ptid_build (task_ptid_get_pid (task_ptid), - 0, task_ptid_get_tid (task_ptid)); - else if (THREAD_PTID_CONTAINS_PID_TID_NULL) - ptid = ptid_build (task_ptid_get_pid (task_ptid), - task_ptid_get_tid (task_ptid), 0); - else - ptid = ptid_build (task_ptid_get_pid (task_ptid), - task_ptid_get_lwp (task_ptid), - task_ptid_get_tid (task_ptid)); - - return ptid; -} - -/* Extract and return the thread_id for the given TASK_PTID. */ - -static long -task_ptid_get_thread_id (task_ptid_t task_ptid) -{ - /* On most platforms, the thread_id is stored in task_ptid.tid. - Unfortunately, some other platforms store it as the task_ptid.lwp... */ - - if (ADA_THREAD_ID_IN_LWP) - return task_ptid_get_lwp (task_ptid); - else - return task_ptid_get_tid (task_ptid); -} - -/* Return non-zero iff the task STATE corresponds to a non-terminated - task state. */ - -static int -task_is_alive (enum task_states state) -{ - return (state != Terminated); -} - -static CORE_ADDR -get_self_id (ptid_t ptid) -{ -#ifdef GNAT_GDB - struct task_entry *ent; - -#if !((defined(sun) && defined(__SVR4)) || defined(VXWORKS_TARGET) || defined(__WIN32__)) - if (thread_support) -#endif - { - ent = get_thread_entry_vptr (GET_CURRENT_THREAD (ptid)); - return ent ? ent->task_id : 0; - } -#endif - - /* FIXME: calling a function in the inferior with a multithreaded application - is not reliable, so return a null address if there is no safe way to - get the current task */ - return 0; -} - -int -ada_get_current_task (ptid_t ptid) -{ - int result; - - if (current_language->la_language != language_ada) - return -1; - - result = get_entry_number (get_self_id (ptid)); - - /* return -1 if not found */ - return result == 0 ? -1 : result; -} - -/* 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 tcb_fieldnos *atcb_fieldnos) -{ - struct type *type; - struct type *common_type; - struct type *ll_type; - struct tcb_fieldnos fieldnos; - -#ifndef ADA_RETAIN_DOTS - const char *atcb_name = "system__tasking__ada_task_control_block___XVE"; - const char *common_atcb_name = "system__tasking__common_atcb"; - const char *private_data_name = "system__task_primitives__private_data"; -#else - const char *atcb_name = "system.tasking.ada_task_control_block___XVE"; - const char *common_atcb_name = "system.tasking.common_atcb"; - const char *private_data_name = "system.task_primitives.private_data"; -#endif - - const struct symbol *atcb_sym = - lookup_symbol (atcb_name, NULL, VAR_DOMAIN, NULL, NULL); - const struct symbol *common_atcb_sym = - lookup_symbol (common_atcb_name, NULL, VAR_DOMAIN, NULL, NULL); - const struct symbol *private_data_sym = - lookup_symbol (private_data_name, NULL, VAR_DOMAIN, NULL, NULL); - - if (atcb_sym == NULL || atcb_sym->type == NULL) - error ("Can not find Ada_Task_Control_Block type. Aborting"); - if (common_atcb_sym == NULL || common_atcb_sym->type == NULL) - error ("Can not find Common_ATCB type. Aborting"); - if (private_data_sym == NULL || private_data_sym->type == NULL) - error ("Can not find Private_Data type. Aborting"); - - /* 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); - - /* 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 field indices. */ - fieldnos.common = ada_get_field_index (type, "common", 0); - fieldnos.state = ada_get_field_index (common_type, "state", 0); - fieldnos.parent = ada_get_field_index (common_type, "parent", 0); - fieldnos.priority = ada_get_field_index (common_type, "base_priority", 0); - fieldnos.image = ada_get_field_index (common_type, "task_image", 0); - fieldnos.image_len = ada_get_field_index (common_type, "task_image_len", 1); - fieldnos.call = ada_get_field_index (common_type, "call", 0); - 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); - - /* 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_fieldnos = fieldnos; -} - -/* Get from the debugging information the type description of the - record type Entry_Call_Record (this is the type of the field - Call.all in the Common_ATCB record type). Also return the index - of the field "Self" in Entry_Call_Record. - - 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_call_type_info (struct type **atcb_call_type, - int *atcb_call_self_fieldno) -{ - struct type *call_type; - int call_self_fieldno; - -#ifndef ADA_RETAIN_DOTS - const char *entry_call_record_name = "system__tasking__entry_call_record"; -#else - const char *entry_call_record_name = "system.tasking.entry_call_record"; -#endif - - const struct symbol *entry_call_record_sym = - lookup_symbol (entry_call_record_name, NULL, VAR_DOMAIN, NULL, NULL); - - if (entry_call_record_sym == NULL || entry_call_record_sym->type == NULL) - error ("Can not find Entry_Call_Record type. Aborting"); - - call_type = entry_call_record_sym->type; - call_self_fieldno = ada_get_field_index (call_type, "self", 0); - - /* Set all the out parameters all at once, now that we are certain - that there are no potential error() anymore. */ - *atcb_call_type = call_type; - *atcb_call_self_fieldno = call_self_fieldno; -} - -/* 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 symbol *sym; - struct minimal_symbol *msym; - - thread_support = 0; -#if (defined(__alpha__) && defined(__osf__) & !defined(VXWORKS_TARGET)) \ - || defined (_AIX) || defined (__CYGWIN__) - thread_support = 1; -#elif defined (__fsu__) - msym = lookup_minimal_symbol (PTHREAD_KERN, NULL, NULL); - if (msym != NULL) - { - pthread_kern_addr = SYMBOL_VALUE_ADDRESS (msym); - thread_support = 1; - } -#elif defined (HAVE_SPYTHREAD) - thread_support = libspy_enabled; -#endif - -#ifdef I386_GNULINUX_TARGET - /* We support threads via the Linux Threads... */ - thread_support = 1; -#endif - - msym = lookup_minimal_symbol (KNOWN_TASKS_NAME, NULL, NULL); - if (msym != NULL) - known_tasks_addr = SYMBOL_VALUE_ADDRESS (msym); - else -#ifndef VXWORKS_TARGET - return 0; -#else - { - if (target_lookup_symbol (KNOWN_TASKS_NAME, &known_tasks_addr) != 0) - return 0; - } -#endif - - /* 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; -} - -/* 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 = TARGET_PTR_BIT / TARGET_CHAR_BIT; - const int temp_tasks_size = target_ptr_byte * MAX_NUMBER_OF_KNOWN_TASKS; - const CORE_ADDR known_tasks_addr = get_known_tasks_addr (); - char *temp_tasks = (char *) alloca (temp_tasks_size); - CORE_ADDR temp_task; - int i; - - /* Step 1: Clear the current list, if any. */ - init_task_list (); - - /* 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, temp_tasks, temp_tasks_size); - for (i = 0; i < MAX_NUMBER_OF_KNOWN_TASKS; i++) - { - temp_task = extract_typed_address (temp_tasks + i * target_ptr_byte, - builtin_type_void_data_ptr); - - if (temp_task != 0) - { - if (get_entry_number (temp_task) == 0) - add_task_entry (temp_task, i); - } - } - - /* 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 (void) -{ - if (!target_has_stack) - error ("No stack"); - - if (stale_task_list_p) - read_known_tasks_array (); - - if (task_list == NULL) - { - printf_filtered ("Your application does not use any Ada task.\n"); - return 0; - } - - return 1; -} - -/* 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); -} - -/* Extract the string image from the fat string corresponding to VAL, - and store it in DEST. The length of the string is stored in LEN. 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, int *len, struct value *val, int max_len) -{ - struct value *array_val; - struct value *bounds_val; - - /* 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); -} - -/* Read the ATCB stored at ATCB_ADDR from the inferior memory. */ - -static struct task_control_block -read_atcb (CORE_ADDR atcb_addr) -{ - /* The type description for the ATCB record and subrecords, and - the associated tcb_fieldnos. For efficiency reasons, these are made - static so that we can compute them only once the first time and - reuse them later. */ - static struct type *atcb_type = NULL; - static struct type *atcb_common_type = NULL; - static struct type *atcb_ll_type = NULL; - static struct tcb_fieldnos fieldno; - - struct task_control_block result; - struct value *tcb_value; - struct value *ll_value; - - if (atcb_type == NULL) - get_tcb_types_info (&atcb_type, &atcb_common_type, &atcb_ll_type, &fieldno); - - tcb_value = value_from_contents_and_address (atcb_type, NULL, atcb_addr); - tcb_value = value_field (tcb_value, fieldno.common); - - result.state = value_as_long (value_field (tcb_value, fieldno.state)); - result.parent = value_as_address (value_field (tcb_value, fieldno.parent)); - result.priority = value_as_long (value_field (tcb_value, fieldno.priority)); - - /* 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. */ - if (fieldno.image_len == -1) - { - read_fat_string_value (result.image, &result.image_len, - value_field (tcb_value, fieldno.image), - sizeof (result.image)); - } - else - { - value_as_string (result.image, value_field (tcb_value, fieldno.image), - sizeof (result.image)); - result.image_len = - value_as_long (value_field (tcb_value, fieldno.image_len)); - } - - result.call = value_as_address (value_field (tcb_value, fieldno.call)); - - ll_value = value_field (tcb_value, fieldno.ll); - result.thread = value_as_address (value_field (ll_value, fieldno.ll_thread)); - if (fieldno.ll_lwp >= 0) - result.lwp = value_as_address (value_field (ll_value, fieldno.ll_lwp)); - else - result.lwp = 0; - - return result; -} - -/* Read the ID of the task with which a task is attempting a rendez-vous - from the address of its Entry_Call_Record in the Ada TCB. - If the address of the Entry_Call_Record is null, then return null. */ - -static CORE_ADDR -read_caller (const CORE_ADDR call) -{ - /* The type description for the Entry_Call_Record, and the index of - the field "Self". For efficiency reasons, these are made static - so that we can compute them only once the first time and reuse them - later. */ - static struct type *atcb_call_type; - static int self_fieldno = -1; - - struct value *call_value; - - if (call == 0) - return 0; - - if (atcb_call_type == NULL) - get_tcb_call_type_info (&atcb_call_type, &self_fieldno); - - call_value = value_from_contents_and_address (atcb_call_type, NULL, call); - return value_as_address (value_field (call_value, self_fieldno)); -} - -#if 0 -/* FIXME: Now modified and back in breakpoint.c */ -/* breakpoint_task_match (PC) returns true if the breakpoint at PC - is valid for current task. */ - -int -breakpoint_task_match (CORE_ADDR pc) -{ - const int this_task = get_current_task (); - const struct breakpoint *breakpoints = get_breakpoint_chain (); - const struct breakpoint *b; - - for (b = breakpoints; b; b = b->next) - { - if (b->enable_state != bp_disabled - && b->enable_state != bp_shlib_disabled - && (b->address == 0 || b->address == pc) - && (b->task == 0 || b->task == this_task)) - { - return 1; - } - } - - return 0; -} -#endif - -/* Print detailed information about specified task */ - -static void -info_task (char *arg, int from_tty) -{ -#ifdef GNAT_GDB - struct task_entry *pt, *pt2; - CORE_ADDR caller; - int num; - - if (current_language->la_language != language_ada) - { - printf_filtered ("The current language does not support tasks.\n"); - return; - } - - target_find_new_threads (); - - pt = get_entry_vptr (atoi (arg)); - if (pt == NULL) - { - printf_filtered ("Task %s not found.\n", arg); - return; - } - - /* print the Ada task id */ - printf_filtered ("Ada Task: %s\n", paddr_nz (pt->task_id)); - - /* print the name of the task */ - if (pt->atcb.image_len != 0) - printf_filtered ("Name: %.*s\n", pt->atcb.image_len, pt->atcb.image); - else - printf_filtered ("<no name>\n"); - - /* print the thread id */ - - if (task_ptid_get_tid (pt->task_ptid) < 65536) - printf_filtered - ("Thread: %ld\n", (long int) task_ptid_get_tid (pt->task_ptid)); - else - printf_filtered - ("Thread: %#lx\n", (long int) task_ptid_get_tid (pt->task_ptid)); - - if (task_ptid_get_lwp (pt->task_ptid) != 0) - { - if ((long) task_ptid_get_lwp (pt->task_ptid) < 65536) - printf_filtered - ("LWP: %ld\n", (long int) task_ptid_get_lwp (pt->task_ptid)); - else - printf_filtered - ("LWP: %#lx\n", (long int) task_ptid_get_lwp (pt->task_ptid)); - } - - /* print the parent gdb task id */ - num = get_entry_number (pt->atcb.parent); - if (num != 0) - { - printf_filtered ("Parent: %d", num); - pt2 = get_entry_vptr (num); - - /* print the name of the task */ - if (pt2->atcb.image_len != 0) - printf_filtered (" (%.*s)\n", pt2->atcb.image_len, pt2->atcb.image); - else - printf_filtered ("\n"); - } - else - printf_filtered ("No parent\n"); - - /* print the base priority of the task */ - printf_filtered ("Base Priority: %d\n", pt->atcb.priority); - - /* print the current state of the task */ - - /* check if this task is accepting a rendezvous */ - caller = read_caller (pt->atcb.call); - if (caller != 0) - { - num = get_entry_number (caller); - printf_filtered ("Accepting rendezvous with %d", num); - - if (num != 0) - { - pt2 = get_entry_vptr (num); - - /* print the name of the task */ - if (pt2->atcb.image_len != 0) { - printf_filtered (" (%.*s)\n", pt2->atcb.image_len, pt2->atcb.image); - } - else - printf_filtered ("\n"); - } - else - printf_filtered ("\n"); - } - else - printf_filtered ("State: %s\n", long_task_states[pt->atcb.state]); -#endif -} - -/* Print information about currently known tasks */ - -static void -info_tasks (char *arg, int from_tty) -{ -#ifdef GNAT_GDB - struct task_entry *pt; - CORE_ADDR caller; - long thread_id = 0L; - int size; - char car; - ptid_t current_ptid; - -#if defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET) - pthreadTeb_t thr; - gdb_gregset_t regs; -#endif - - current_ptid = inferior_ptid; - -#if !((defined(sun) && defined(__SVR4)) || defined(VXWORKS_TARGET) || defined(__WIN32__) || defined (hpux)) - if (thread_support) -#endif - thread_id = GET_CURRENT_THREAD (inferior_ptid); - - /* print the header */ - -#if defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET) - printf_filtered - (" ID TID P-ID Pri Stack %% State Name\n"); -#else - printf_filtered (" ID TID P-ID Pri State Name\n"); -#endif - - /* Now that we have a list of task id's, we can print them */ - pt = task_list; - while (pt) - { - /* print a star if this task is the current one */ - if (thread_id) -#if defined (__WIN32__) || defined (SGI) || defined (hpux) - printf_filtered - (task_ptid_get_lwp (pt->task_ptid) == thread_id ? "*" : " "); -#else - printf_filtered - (task_ptid_get_thread_id (pt->task_ptid) == thread_id ? "*" : " "); -#endif - - /* print the gdb task id */ - printf_filtered ("%3d", pt->task_num); - - /* print the Ada task id */ - printf_filtered (" %9lx", (long) pt->task_id); - - /* print the parent gdb task id */ - printf_filtered (" %4d", get_entry_number (pt->atcb.parent)); - - /* print the base priority of the task */ - printf_filtered (" %3d", pt->atcb.priority); - -#if defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET) - if (pt->task_num == 1 || pt->atcb.state == Terminated) - { - printf_filtered (" Unknown"); - goto next; - } - - READ_MEMORY (pt->atcb.thread, thr); - switch_to_thread (task_ptid_get_ptid (pt->task_ptid)); - /* ??? Brobecker 2003-03-13: Not sure what the next line is used for. - And even if useful, it should probably be replaced by call to - task_ptid_get_thread_id. */ - current_thread = task_ptid_get_tid (pt->task_ptid); - regs.regs[SP_REGNUM] = 0; - if (dec_thread_get_registers (®s, NULL) == 0) - { - pt->stack_per = (100 * ((long) thr.__stack_base - - regs.regs[SP_REGNUM])) / thr.__stack_size; - /* if the thread is terminated but still there, the - stack_base/size values are erroneous. Try to patch it */ - if (pt->stack_per < 0 || pt->stack_per > 100) - pt->stack_per = 0; - } - else - { - /* Set stack_per to an invalid value to signal that we did not - manage to compute its value. */ - pt->stack_per = -1; - } - - /* print information about stack space used in the thread */ - if (thr.__stack_size < 1024 * 1024) - { - size = thr.__stack_size / 1024; - car = 'K'; - } - else if (thr.__stack_size < 1024 * 1024 * 1024) - { - size = thr.__stack_size / 1024 / 1024; - car = 'M'; - } - else /* Who knows... */ - { - size = thr.__stack_size / 1024 / 1024 / 1024; - car = 'G'; - } - - /* print the stack usage in percent, if available. */ - if (pt->stack_per != -1) - printf_filtered (" %4d%c %2d", size, car, pt->stack_per); - else - { - /* This error is not serious enough that we should raise - an internal error, but print '???' to make it unambiguous - that we failed to compute this value. */ - printf_filtered (" ???"); - } - - next: -#endif - - /* print the current state of the task */ - - /* check if this task is accepting a rendezvous */ - caller = read_caller (pt->atcb.call); - if (caller != 0) - printf_filtered (" Accepting RV with %-4d", - get_entry_number (caller)); - else - { -#if defined (__WIN32__) || defined (SGI) || defined (hpux) - if (pt->atcb.state == Runnable - && (thread_id - && task_ptid_get_lwp (pt->task_ptid) == thread_id)) -#else - if (pt->atcb.state == Runnable - && (thread_id - && task_ptid_get_thread_id (pt->task_ptid) == thread_id)) -#endif - /* Replace "Runnable" by "Running" if this is the current task */ - printf_filtered (" %-22s", "Running"); - else - printf_filtered (" %-22s", task_states[pt->atcb.state]); - } - - /* finally, print the name of the task */ - if (pt->atcb.image_len != 0) { - printf_filtered (" %.*s\n", pt->atcb.image_len, pt->atcb.image); - } - else - printf_filtered (" <no name>\n"); - - pt = pt->next_task; - } - if (!ptid_equal (inferior_ptid, current_ptid)) - switch_to_thread (current_ptid); -#endif -} - -static void -info_tasks_command (char *arg, int from_tty) -{ - const int task_list_built = ada_build_task_list (); - - if (!task_list_built) - return; - - if (arg == NULL || *arg == '\000') - info_tasks (arg, from_tty); - else - info_task (arg, from_tty); -} - -/* Switch to task indicated by NEW_TASK. Return 0 iff successful. */ - -static int -switch_to_task (struct task_entry *new_task) -{ -#ifdef GNAT_GDB - /* Raise an error if task-switching is currently not allowed. */ - if (!THREAD_SWITCH_ALLOWED ()) - error ("Task switching is currently not allowed."); - - if (!task_is_alive (new_task->atcb.state)) - error ("Can not switch to task %d: Task is no longer running", - new_task->task_num); - - current_task = new_task->task_num; - current_thread = task_ptid_get_thread_id (new_task->task_ptid); - - if (current_task_id == -1) - { - SAVE_TASK_REGISTERS (new_task); - current_task_id = ada_get_current_task (inferior_ptid); - } - - if (SPECIAL_THREAD_SUPPORT_ACTIVE ()) - { - /* FIXME: Integrate with switch_to_thread */ - int ret_code; - flush_cached_frames (); - registers_changed (); - if (current_task == current_task_id) - { - RESTORE_TASK_REGISTERS (new_task); - ret_code = 0; - } - else - ret_code = THREAD_FETCH_REGISTERS (); - if (ret_code == 0) - stop_pc = read_pc (); - select_frame (get_current_frame ()); - return ret_code; - } - - switch_to_thread (task_ptid_get_ptid (new_task->task_ptid)); -#endif - return 0; -} - -/* Print a message telling the user id of the current task. - Print an error message if the application does not appear to - be using any Ada task. */ - -static void -display_current_task_id (void) -{ - const int current_task = ada_get_current_task (inferior_ptid); - - if (current_task == -1) - 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 *tidstr, int from_tty) -{ - const int num = value_as_long (parse_and_eval (tidstr)); - struct task_entry *e = get_entry_vptr (num); - - if (e == NULL) - error ("Task ID %d not known. Use the \"info tasks\" command to\n" - "see the IDs of currently known tasks", num); - - if (switch_to_task (e) == 0) - { - ada_find_printable_frame (get_selected_frame ()); - printf_filtered ("[Switching to task %d]\n", num); - print_stack_frame (get_selected_frame (), - frame_relative_level (get_selected_frame ()), 1); - } - else - printf_filtered ("Unable to switch to task %d\n", num); -} - -/* Switch to task indicated in TIDSTR. Simply print the current task - if TIDSTR is empty or NULL. */ - -static void -task_command (char *tidstr, int from_tty) -{ - const int task_list_built = ada_build_task_list (); - - if (!task_list_built) - return; - - if (tidstr == NULL || tidstr[0] == '\0') - display_current_task_id (); - else - task_command_1 (tidstr, from_tty); -} - -#if defined (__fsu__) || (defined(__alpha__) && defined(__osf__) && !defined(VXWORKS_TARGET)) -/* Restore saved registers if there was a task switch. */ -void -ada_reset_thread_registers (void) -{ - if (current_task_id != -1 && SPECIAL_THREAD_SUPPORT_ACTIVE ()) - { - supply_gregset (&gregset_saved); - supply_fpregset (&fpregset_saved); - reinit_frame_cache (); - stop_pc = read_pc (); - } - current_task_id = -1; -} -#else -void -ada_reset_thread_registers (void) -{ -} -#endif - -/* The 'normal_stop' observer notification callback. */ - -static void -normal_stop_notification (void) -{ - /* The inferior has been resumed, and just stopped. This means that - our task_list needs to be recomputed before it can be used again. */ - stale_task_list_p = 1; -} - -/* Attach all the observers needed by the ada-tasks module. */ - -static void -ada_tasks_attach_observers (void) -{ - observer_attach_normal_stop (&normal_stop_notification); -} - -void -_initialize_tasks (void) -{ -#ifdef GNAT_GDB - extern struct cmd_list_element *cmdlist; - - ada_tasks_attach_observers (); - - add_info ("tasks", info_tasks_command, - "Without argument: list all known Ada tasks, with status information.\n" - "info tasks n: print detailed information of task n."); - - add_cmd ("task", class_run, task_command, - "Without argument: print the current task ID.\n" - "task n: Use this command to switch to task n.", - &cmdlist); -#endif -} |