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Add multiple-CPU support in ravenscar-thread.c

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This patch reworks the ravenscar-thread layer to remove the
assumption that the target only has 1 CPU. In particular,
when connected to a QEMU target over the remote protocol,
QEMU reports each CPU as one thread. This patch adapts
the ravenscar-thread layer to this, and adds a large comment
explaining the general design of this unit.

gdb/ChangeLog:

        * ada-lang.h (ada_get_task_info_from_ptid): Add declaration.
        * ada-tasks.c (ada_get_task_info_from_ptid): New function.
        * ravenscar-thread.c: Add into comment.
        (base_magic_null_ptid): Delete.
        (base_ptid): Change documentation.
        (ravenscar_active_task): Renames ravenscar_running_thread.
        All callers updated throughout.
        (is_ravenscar_task, ravenscar_get_thread_base_cpu): New function.
        (ravenscar_task_is_currently_active): Likewise.
        (get_base_thread_from_ravenscar_task): Ditto.
        (ravenscar_update_inferior_ptid): Adjust to handle multiple CPUs.
        (ravenscar_runtime_initialized): Likewise.
        (get_running_thread_id): Add new parameter "cpu".  Adjust
        implementation to handle this new parameter.
        (ravenscar_fetch_registers): Small adjustment to use
        is_ravenscar_task and ravenscar_task_is_currently_active in
        order to decide whether to use the target beneath or this
        module's arch_ops.
        (ravenscar_store_registers, ravenscar_prepare_to_store): Likewise.
        (ravenscar_stopped_by_sw_breakpoint): Use
        get_base_thread_from_ravenscar_task to get the underlying
        thread, rather than using base_ptid.
        (ravenscar_stopped_by_hw_breakpoint, ravenscar_stopped_by_watchpoint)
        (ravenscar_stopped_data_address, ravenscar_core_of_thread):
        Likewise.
        (ravenscar_inferior_created): Do not set base_magic_null_ptid.
This commit is contained in:
Joel Brobecker
2017-11-21 14:00:30 -08:00
parent 65d40437e2
commit 9edcc12f9b
4 changed files with 191 additions and 34 deletions
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24
gdb/ada-tasks.c
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@@ -353,6 +353,30 @@ ada_task_is_alive (struct ada_task_info *task_info)
return (task_info->state != Terminated);
}
/* Search through the list of known tasks for the one whose ptid is
PTID, and return it. Return NULL if the task was not found. */
struct ada_task_info *
ada_get_task_info_from_ptid (ptid_t ptid)
{
int i, nb_tasks;
struct ada_task_info *task;
struct ada_tasks_inferior_data *data;
ada_build_task_list ();
data = get_ada_tasks_inferior_data (current_inferior ());
nb_tasks = VEC_length (ada_task_info_s, data->task_list);
for (i = 0; i < nb_tasks; i++)
{
task = VEC_index (ada_task_info_s, data->task_list, i);
if (ptid_equal (task->ptid, ptid))
return task;
}
return NULL;
}
/* Call the ITERATOR function once for each Ada task that hasn't been
terminated yet. */