X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fravenscar-thread.c;h=db269597709ce3c76d14b055eb13aac600117e3f;hb=ab1ddbcf110a3f1ad45e3a346d2da98ffb833dec;hp=572e05db0dda631b153507657a828794e1bc98d5;hpb=989f3c583d31e29029b1b7dd8ffd3afacbbb5c27;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/ravenscar-thread.c b/gdb/ravenscar-thread.c
index 572e05db0d..db26959770 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 +76,11 @@ static const target_info ravenscar_target_info = {
 
 struct ravenscar_thread_target final : public target_ops
 {
+  ravenscar_thread_target ()
+  {
+    update_inferior_ptid ();
+  }
+
   const target_info &info () const override
   { return ravenscar_target_info; }
 
@@ -110,18 +110,29 @@ 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;
+  }
+
+private:
+
+  /* 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 = null_ptid;
 
-static ptid_t ravenscar_active_task (int cpu);
-static bool ravenscar_runtime_initialized ();
+  void update_inferior_ptid ();
+  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.  */
 
@@ -175,11 +186,11 @@ 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 bool
-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;
 }
@@ -205,24 +216,24 @@ get_base_thread_from_ravenscar_task (ptid_t ptid)
 /* Fetch the ravenscar running thread from target memory and
    update inferior_ptid accordingly.  */
 
-static void
-ravenscar_update_inferior_ptid ()
+void
+ravenscar_thread_target::update_inferior_ptid ()
 {
   int base_cpu;
 
-  base_ptid = inferior_ptid;
+  m_base_ptid = inferior_ptid;
 
   gdb_assert (!is_ravenscar_task (inferior_ptid));
-  base_cpu = ravenscar_get_thread_base_cpu (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 ())
+  if (!runtime_initialized ())
     return;
 
-  /* 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);
+  inferior_ptid = active_task (base_cpu);
   gdb_assert (inferior_ptid != null_ptid);
 
   /* The running thread may not have been added to
@@ -276,10 +287,10 @@ has_ravenscar_runtime ()
 /* Return True if the Ada Ravenscar run-time can be found in the
    application, and if it has been initialized on target.  */
 
-static bool
-ravenscar_runtime_initialized ()
+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.
@@ -312,8 +323,12 @@ 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
@@ -323,8 +338,10 @@ ravenscar_thread_target::wait (ptid_t ptid,
 {
   ptid_t event_ptid;
 
-  inferior_ptid = base_ptid;
-  event_ptid = beneath ()->wait (base_ptid, status, 0);
+  inferior_ptid = m_base_ptid;
+  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 update
      inferior_ptid to the active thread.
 
@@ -337,8 +354,10 @@ ravenscar_thread_target::wait (ptid_t ptid,
     {
       inferior_ptid = event_ptid;
       this->update_thread_list ();
-      ravenscar_update_inferior_ptid ();
+      this->update_inferior_ptid ();
     }
+  else
+    inferior_ptid = m_base_ptid;
   return inferior_ptid;
 }
 
@@ -355,25 +374,23 @@ ravenscar_add_thread (struct ada_task_info *task)
 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 *
@@ -389,13 +406,10 @@ 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
@@ -403,9 +417,9 @@ 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
@@ -423,9 +437,9 @@ 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
@@ -442,9 +456,9 @@ 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.  */
     }
@@ -495,9 +509,9 @@ ravenscar_thread_target::stopped_data_address (CORE_ADDR *addr_p)
 void
 ravenscar_thread_target::mourn_inferior ()
 {
-  base_ptid = null_ptid;
+  m_base_ptid = null_ptid;
   beneath ()->mourn_inferior ();
-  unpush_target (&ravenscar_ops);
+  unpush_target (this);
 }
 
 /* Implement the to_core_of_thread target_ops "method".  */
@@ -529,14 +543,14 @@ 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.  */
@@ -582,24 +596,22 @@ Support for Ravenscar task/thread switching is disabled\n"));
 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"),
+                  _("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"),
+                  _("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."),