X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fravenscar-thread.c;h=72253188c716ec94ff6831a02507fc3e72c11682;hb=48e9cc84058771da089a2e8e652f70ac20a8fac0;hp=0e0b6f2d785a24deefa0cfdfee1da3f8119a62e4;hpb=6cbcc006e95110b5d9168e9835e5df36782e975b;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/ravenscar-thread.c b/gdb/ravenscar-thread.c
index 0e0b6f2d78..72253188c7 100644
--- a/gdb/ravenscar-thread.c
+++ b/gdb/ravenscar-thread.c
@@ -1,6 +1,6 @@
 /* Ada Ravenscar thread support.
 
-   Copyright (C) 2004-2019 Free Software Foundation, Inc.
+   Copyright (C) 2004-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -57,13 +57,8 @@
    is running, switching to its corresponding ptid, and then performing
    the operation on that ptid using the target beneath us.  */
 
-/* If non-null, ravenscar task support is enabled.  */
-static int ravenscar_task_support = 1;
-
-/* PTID of the last thread that received an event.
-   This can be useful to determine the associated task that received
-   the event, to make it the current task.  */
-static ptid_t base_ptid;
+/* If true, ravenscar task support is enabled.  */
+static bool ravenscar_task_support = true;
 
 static const char running_thread_name[] = "__gnat_running_thread_table";
 
@@ -81,6 +76,14 @@ static const target_info ravenscar_target_info = {
 
 struct ravenscar_thread_target final : public target_ops
 {
+  ravenscar_thread_target ()
+    : m_base_ptid (inferior_ptid)
+  {
+    thread_info *thr = add_active_thread ();
+    if (thr != nullptr)
+      switch_to_thread (thr);
+  }
+
   const target_info &info () const override
   { return ravenscar_target_info; }
 
@@ -110,26 +113,33 @@ struct ravenscar_thread_target final : public target_ops
 
   const char *extra_thread_info (struct thread_info *) override;
 
-  const char *pid_to_str (ptid_t) override;
+  std::string pid_to_str (ptid_t) override;
 
   ptid_t get_ada_task_ptid (long lwp, long thread) override;
 
   void mourn_inferior () override;
-};
 
-/* This module's target-specific operations.  */
-static ravenscar_thread_target ravenscar_ops;
+  void close () override
+  {
+    delete this;
+  }
 
-static ptid_t ravenscar_active_task (int cpu);
-static void ravenscar_update_inferior_ptid (void);
-static int has_ravenscar_runtime (void);
-static int ravenscar_runtime_initialized (void);
-static void ravenscar_inferior_created (struct target_ops *target,
-					int from_tty);
+private:
 
-/* Return nonzero iff PTID corresponds to a ravenscar task.  */
+  /* PTID of the last thread that received an event.
+     This can be useful to determine the associated task that received
+     the event, to make it the current task.  */
+  ptid_t m_base_ptid;
 
-static int
+  thread_info *add_active_thread ();
+  ptid_t active_task (int cpu);
+  bool task_is_currently_active (ptid_t ptid);
+  bool runtime_initialized ();
+};
+
+/* Return true iff PTID corresponds to a ravenscar task.  */
+
+static bool
 is_ravenscar_task (ptid_t ptid)
 {
   /* By construction, ravenscar tasks have their LWP set to zero.
@@ -169,7 +179,7 @@ ravenscar_get_thread_base_cpu (ptid_t ptid)
   return base_cpu;
 }
 
-/* Given a ravenscar task (identified by its ptid_t PTID), return nonzero
+/* Given a ravenscar task (identified by its ptid_t PTID), return true
    if this task is the currently active task on the cpu that task is
    running on.
 
@@ -179,11 +189,11 @@ ravenscar_get_thread_base_cpu (ptid_t ptid)
    that task's registers are in the CPU bank.  Otherwise, the task
    is currently suspended, and its registers have been saved in memory.  */
 
-static int
-ravenscar_task_is_currently_active (ptid_t ptid)
+bool
+ravenscar_thread_target::task_is_currently_active (ptid_t ptid)
 {
   ptid_t active_task_ptid
-    = ravenscar_active_task (ravenscar_get_thread_base_cpu (ptid));
+    = active_task (ravenscar_get_thread_base_cpu (ptid));
 
   return ptid == active_task_ptid;
 }
@@ -206,34 +216,36 @@ get_base_thread_from_ravenscar_task (ptid_t ptid)
   return ptid_t (ptid.pid (), base_cpu, 0);
 }
 
-/* Fetch the ravenscar running thread from target memory and
-   update inferior_ptid accordingly.  */
+/* Fetch the ravenscar running thread from target memory, make sure
+   there's a corresponding thread in the thread list, and return it.
+   If the runtime is not initialized, return NULL.  */
 
-static void
-ravenscar_update_inferior_ptid (void)
+thread_info *
+ravenscar_thread_target::add_active_thread ()
 {
-  int base_cpu;
+  process_stratum_target *proc_target
+    = as_process_stratum_target (this->beneath ());
 
-  base_ptid = inferior_ptid;
+  int base_cpu;
 
-  gdb_assert (!is_ravenscar_task (inferior_ptid));
-  base_cpu = ravenscar_get_thread_base_cpu (base_ptid);
+  gdb_assert (!is_ravenscar_task (m_base_ptid));
+  base_cpu = ravenscar_get_thread_base_cpu (m_base_ptid);
 
-  /* If the runtime has not been initialized yet, the inferior_ptid is
-     the only ptid that there is.  */
-  if (!ravenscar_runtime_initialized ())
-    return;
+  if (!runtime_initialized ())
+    return nullptr;
 
-  /* Make sure we set base_ptid before calling ravenscar_active_task
+  /* Make sure we set m_base_ptid before calling active_task
      as the latter relies on it.  */
-  inferior_ptid = ravenscar_active_task (base_cpu);
-  gdb_assert (inferior_ptid != null_ptid);
+  ptid_t active_ptid = active_task (base_cpu);
+  gdb_assert (active_ptid != null_ptid);
 
   /* The running thread may not have been added to
      system.tasking.debug's list yet; so ravenscar_update_thread_list
      may not always add it to the thread list.  Add it here.  */
-  if (!find_thread_ptid (inferior_ptid))
-    add_thread (inferior_ptid);
+  thread_info *active_thr = find_thread_ptid (proc_target, active_ptid);
+  if (active_thr == nullptr)
+    active_thr = add_thread (proc_target, active_ptid);
+  return active_thr;
 }
 
 /* The Ravenscar Runtime exports a symbol which contains the ID of
@@ -242,7 +254,7 @@ ravenscar_update_inferior_ptid (void)
    Return NULL if not found.  */
 
 static struct bound_minimal_symbol
-get_running_thread_msymbol (void)
+get_running_thread_msymbol ()
 {
   struct bound_minimal_symbol msym;
 
@@ -260,8 +272,8 @@ get_running_thread_msymbol (void)
 /* Return True if the Ada Ravenscar run-time can be found in the
    application.  */
 
-static int
-has_ravenscar_runtime (void)
+static bool
+has_ravenscar_runtime ()
 {
   struct bound_minimal_symbol msym_ravenscar_runtime_initializer
     = lookup_minimal_symbol (ravenscar_runtime_initializer, NULL, NULL);
@@ -280,10 +292,10 @@ has_ravenscar_runtime (void)
 /* Return True if the Ada Ravenscar run-time can be found in the
    application, and if it has been initialized on target.  */
 
-static int
-ravenscar_runtime_initialized (void)
+bool
+ravenscar_thread_target::runtime_initialized ()
 {
-  return (!(ravenscar_active_task (1) == null_ptid));
+  return active_task (1) != null_ptid;
 }
 
 /* Return the ID of the thread that is currently running.
@@ -316,8 +328,12 @@ void
 ravenscar_thread_target::resume (ptid_t ptid, int step,
 				 enum gdb_signal siggnal)
 {
-  inferior_ptid = base_ptid;
-  beneath ()->resume (base_ptid, step, siggnal);
+  /* If we see a wildcard resume, we simply pass that on.  Otherwise,
+     arrange to resume the base ptid.  */
+  inferior_ptid = m_base_ptid;
+  if (ptid != minus_one_ptid)
+    ptid = m_base_ptid;
+  beneath ()->resume (ptid, step, siggnal);
 }
 
 ptid_t
@@ -325,12 +341,15 @@ ravenscar_thread_target::wait (ptid_t ptid,
 			       struct target_waitstatus *status,
 			       int options)
 {
+  process_stratum_target *beneath
+    = as_process_stratum_target (this->beneath ());
   ptid_t event_ptid;
 
-  inferior_ptid = base_ptid;
-  event_ptid = beneath ()->wait (base_ptid, status, 0);
-  /* Find any new threads that might have been created, and update
-     inferior_ptid to the active thread.
+  if (ptid != minus_one_ptid)
+    ptid = m_base_ptid;
+  event_ptid = beneath->wait (ptid, status, 0);
+  /* Find any new threads that might have been created, and return the
+     active thread.
 
      Only do it if the program is still alive, though.  Otherwise,
      this causes problems when debugging through the remote protocol,
@@ -339,11 +358,11 @@ ravenscar_thread_target::wait (ptid_t ptid,
   if (status->kind != TARGET_WAITKIND_EXITED
       && status->kind != TARGET_WAITKIND_SIGNALLED)
     {
-      inferior_ptid = event_ptid;
+      m_base_ptid = event_ptid;
       this->update_thread_list ();
-      ravenscar_update_inferior_ptid ();
+      return this->add_active_thread ()->ptid;
     }
-  return inferior_ptid;
+  return m_base_ptid;
 }
 
 /* Add the thread associated to the given TASK to the thread list
@@ -352,32 +371,30 @@ ravenscar_thread_target::wait (ptid_t ptid,
 static void
 ravenscar_add_thread (struct ada_task_info *task)
 {
-  if (find_thread_ptid (task->ptid) == NULL)
-    add_thread (task->ptid);
+  if (find_thread_ptid (current_inferior (), task->ptid) == NULL)
+    add_thread (current_inferior ()->process_target (), task->ptid);
 }
 
 void
 ravenscar_thread_target::update_thread_list ()
 {
-  ada_build_task_list ();
-
   /* Do not clear the thread list before adding the Ada task, to keep
      the thread that the process stratum has included into it
-     (base_ptid) and the running thread, that may not have been included
+     (m_base_ptid) and the running thread, that may not have been included
      to system.tasking.debug's list yet.  */
 
   iterate_over_live_ada_tasks (ravenscar_add_thread);
 }
 
-static ptid_t
-ravenscar_active_task (int cpu)
+ptid_t
+ravenscar_thread_target::active_task (int cpu)
 {
   CORE_ADDR tid = get_running_thread_id (cpu);
 
   if (tid == 0)
     return null_ptid;
   else
-    return ptid_t (base_ptid.pid (), 0, tid);
+    return ptid_t (m_base_ptid.pid (), 0, tid);
 }
 
 const char *
@@ -393,13 +410,10 @@ ravenscar_thread_target::thread_alive (ptid_t ptid)
   return true;
 }
 
-const char *
+std::string
 ravenscar_thread_target::pid_to_str (ptid_t ptid)
 {
-  static char buf[30];
-
-  snprintf (buf, sizeof (buf), "Thread %#x", (int) ptid.tid ());
-  return buf;
+  return string_printf ("Thread %#x", (int) ptid.tid ());
 }
 
 void
@@ -407,9 +421,9 @@ ravenscar_thread_target::fetch_registers (struct regcache *regcache, int regnum)
 {
   ptid_t ptid = regcache->ptid ();
 
-  if (ravenscar_runtime_initialized ()
+  if (runtime_initialized ()
       && is_ravenscar_task (ptid)
-      && !ravenscar_task_is_currently_active (ptid))
+      && !task_is_currently_active (ptid))
     {
       struct gdbarch *gdbarch = regcache->arch ();
       struct ravenscar_arch_ops *arch_ops
@@ -427,9 +441,9 @@ ravenscar_thread_target::store_registers (struct regcache *regcache,
 {
   ptid_t ptid = regcache->ptid ();
 
-  if (ravenscar_runtime_initialized ()
+  if (runtime_initialized ()
       && is_ravenscar_task (ptid)
-      && !ravenscar_task_is_currently_active (ptid))
+      && !task_is_currently_active (ptid))
     {
       struct gdbarch *gdbarch = regcache->arch ();
       struct ravenscar_arch_ops *arch_ops
@@ -446,9 +460,9 @@ ravenscar_thread_target::prepare_to_store (struct regcache *regcache)
 {
   ptid_t ptid = regcache->ptid ();
 
-  if (ravenscar_runtime_initialized ()
+  if (runtime_initialized ()
       && is_ravenscar_task (ptid)
-      && !ravenscar_task_is_currently_active (ptid))
+      && !task_is_currently_active (ptid))
     {
       /* Nothing.  */
     }
@@ -499,9 +513,10 @@ ravenscar_thread_target::stopped_data_address (CORE_ADDR *addr_p)
 void
 ravenscar_thread_target::mourn_inferior ()
 {
-  base_ptid = null_ptid;
-  beneath ()->mourn_inferior ();
-  unpush_target (&ravenscar_ops);
+  m_base_ptid = null_ptid;
+  target_ops *beneath = this->beneath ();
+  unpush_target (this);
+  beneath->mourn_inferior ();
 }
 
 /* Implement the to_core_of_thread target_ops "method".  */
@@ -533,38 +548,20 @@ ravenscar_inferior_created (struct target_ops *target, int from_tty)
       return;
     }
 
-  ravenscar_update_inferior_ptid ();
-  push_target (&ravenscar_ops);
+  target_ops_up target_holder (new ravenscar_thread_target ());
+  push_target (std::move (target_holder));
 }
 
 ptid_t
 ravenscar_thread_target::get_ada_task_ptid (long lwp, long thread)
 {
-  return ptid_t (base_ptid.pid (), 0, thread);
+  return ptid_t (m_base_ptid.pid (), 0, thread);
 }
 
 /* Command-list for the "set/show ravenscar" prefix command.  */
 static struct cmd_list_element *set_ravenscar_list;
 static struct cmd_list_element *show_ravenscar_list;
 
-/* Implement the "set ravenscar" prefix command.  */
-
-static void
-set_ravenscar_command (const char *arg, int from_tty)
-{
-  printf_unfiltered (_(\
-"\"set ravenscar\" must be followed by the name of a setting.\n"));
-  help_list (set_ravenscar_list, "set ravenscar ", all_commands, gdb_stdout);
-}
-
-/* Implement the "show ravenscar" prefix command.  */
-
-static void
-show_ravenscar_command (const char *args, int from_tty)
-{
-  cmd_show_list (show_ravenscar_list, from_tty, "");
-}
-
 /* Implement the "show ravenscar task-switching" command.  */
 
 static void
@@ -583,27 +580,26 @@ Support for Ravenscar task/thread switching is disabled\n"));
 /* Module startup initialization function, automagically called by
    init.c.  */
 
+void _initialize_ravenscar ();
 void
-_initialize_ravenscar (void)
+_initialize_ravenscar ()
 {
-  base_ptid = null_ptid;
-
   /* Notice when the inferior is created in order to push the
      ravenscar ops if needed.  */
   gdb::observers::inferior_created.attach (ravenscar_inferior_created);
 
-  add_prefix_cmd ("ravenscar", no_class, set_ravenscar_command,
-                  _("Prefix command for changing Ravenscar-specific settings"),
-                  &set_ravenscar_list, "set ravenscar ", 0, &setlist);
+  add_basic_prefix_cmd ("ravenscar", no_class,
+			_("Prefix command for changing Ravenscar-specific settings."),
+			&set_ravenscar_list, "set ravenscar ", 0, &setlist);
 
-  add_prefix_cmd ("ravenscar", no_class, show_ravenscar_command,
-                  _("Prefix command for showing Ravenscar-specific settings"),
-                  &show_ravenscar_list, "show ravenscar ", 0, &showlist);
+  add_show_prefix_cmd ("ravenscar", no_class,
+		       _("Prefix command for showing Ravenscar-specific settings."),
+		       &show_ravenscar_list, "show ravenscar ", 0, &showlist);
 
   add_setshow_boolean_cmd ("task-switching", class_obscure,
                            &ravenscar_task_support, _("\
-Enable or disable support for GNAT Ravenscar tasks"), _("\
-Show whether support for GNAT Ravenscar tasks is enabled"),
+Enable or disable support for GNAT Ravenscar tasks."), _("\
+Show whether support for GNAT Ravenscar tasks is enabled."),
                            _("\
 Enable or disable support for task/thread switching with the GNAT\n\
 Ravenscar run-time library for bareboard configuration."),