662 lines
17 KiB
C
662 lines
17 KiB
C
/* OpenACC Profiling Interface
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Copyright (C) 2019-2022 Free Software Foundation, Inc.
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Contributed by Mentor, a Siemens Business.
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#define _GNU_SOURCE
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#include "libgomp.h"
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#include "oacc-int.h"
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#include "secure_getenv.h"
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#include "acc_prof.h"
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#include <assert.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef PLUGIN_SUPPORT
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# include <dlfcn.h>
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#endif
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#define STATIC_ASSERT(expr) _Static_assert (expr, "!(" #expr ")")
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/* Statically assert that the layout of the common fields in the
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'acc_event_info' variants matches. */
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/* 'event_type' */
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STATIC_ASSERT (offsetof (acc_event_info, event_type)
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== offsetof (acc_event_info, data_event.event_type));
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STATIC_ASSERT (offsetof (acc_event_info, data_event.event_type)
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== offsetof (acc_event_info, launch_event.event_type));
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STATIC_ASSERT (offsetof (acc_event_info, data_event.event_type)
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== offsetof (acc_event_info, other_event.event_type));
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/* 'valid_bytes' */
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STATIC_ASSERT (offsetof (acc_event_info, data_event.valid_bytes)
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== offsetof (acc_event_info, launch_event.valid_bytes));
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STATIC_ASSERT (offsetof (acc_event_info, data_event.valid_bytes)
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== offsetof (acc_event_info, other_event.valid_bytes));
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/* 'parent_construct' */
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STATIC_ASSERT (offsetof (acc_event_info, data_event.parent_construct)
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== offsetof (acc_event_info, launch_event.parent_construct));
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STATIC_ASSERT (offsetof (acc_event_info, data_event.parent_construct)
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== offsetof (acc_event_info, other_event.parent_construct));
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/* 'implicit' */
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STATIC_ASSERT (offsetof (acc_event_info, data_event.implicit)
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== offsetof (acc_event_info, launch_event.implicit));
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STATIC_ASSERT (offsetof (acc_event_info, data_event.implicit)
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== offsetof (acc_event_info, other_event.implicit));
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/* 'tool_info' */
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STATIC_ASSERT (offsetof (acc_event_info, data_event.tool_info)
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== offsetof (acc_event_info, launch_event.tool_info));
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STATIC_ASSERT (offsetof (acc_event_info, data_event.tool_info)
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== offsetof (acc_event_info, other_event.tool_info));
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struct goacc_prof_callback_entry
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{
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acc_prof_callback cb;
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int ref;
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bool enabled;
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struct goacc_prof_callback_entry *next;
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};
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/* Use a separate flag to minimize run-time performance impact for the (very
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common) case that profiling is not enabled.
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Once enabled, we're not going to disable this anymore, anywhere. We
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probably could, by adding appropriate logic to 'acc_prof_register',
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'acc_prof_unregister'. */
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bool goacc_prof_enabled = false;
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/* Global state for registered callbacks.
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'goacc_prof_callbacks_enabled[acc_ev_none]' acts as a global toggle. */
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static bool goacc_prof_callbacks_enabled[acc_ev_last];
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static struct goacc_prof_callback_entry *goacc_prof_callback_entries[acc_ev_last];
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/* Lock used to protect access to 'goacc_prof_callbacks_enabled', and
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'goacc_prof_callback_entries'. */
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static gomp_mutex_t goacc_prof_lock;
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void
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goacc_profiling_initialize (void)
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{
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gomp_mutex_init (&goacc_prof_lock);
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/* Initially, all callbacks for all events are enabled. */
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for (int i = 0; i < acc_ev_last; ++i)
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goacc_prof_callbacks_enabled[i] = true;
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#ifdef PLUGIN_SUPPORT
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char *acc_proflibs = secure_getenv ("ACC_PROFLIB");
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while (acc_proflibs != NULL && acc_proflibs[0] != '\0')
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{
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char *acc_proflibs_sep = strchr (acc_proflibs, ';');
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char *acc_proflib;
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if (acc_proflibs_sep == acc_proflibs)
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{
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/* Stray ';' separator: make sure we don't 'dlopen' the main
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program. */
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acc_proflib = NULL;
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}
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else
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{
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if (acc_proflibs_sep != NULL)
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{
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/* Single out the first library. */
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acc_proflib = gomp_malloc (acc_proflibs_sep - acc_proflibs + 1);
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memcpy (acc_proflib, acc_proflibs,
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acc_proflibs_sep - acc_proflibs);
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acc_proflib[acc_proflibs_sep - acc_proflibs] = '\0';
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}
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else
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{
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/* No ';' separator, so only one library. */
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acc_proflib = acc_proflibs;
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}
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gomp_debug (0, "%s: dlopen (\"%s\")\n", __FUNCTION__, acc_proflib);
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void *dl_handle = dlopen (acc_proflib, RTLD_LAZY);
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if (dl_handle != NULL)
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{
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typeof (&acc_register_library) a_r_l
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= dlsym (dl_handle, "acc_register_library");
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if (a_r_l == NULL)
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goto dl_fail;
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gomp_debug (0, " %s: calling %s:acc_register_library\n",
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__FUNCTION__, acc_proflib);
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a_r_l (acc_prof_register, acc_prof_unregister,
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acc_prof_lookup);
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}
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else
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{
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dl_fail:
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gomp_error ("while loading ACC_PROFLIB \"%s\": %s",
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acc_proflib, dlerror ());
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if (dl_handle != NULL)
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{
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int err = dlclose (dl_handle);
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dl_handle = NULL;
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if (err != 0)
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goto dl_fail;
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}
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}
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}
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if (acc_proflib != acc_proflibs)
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{
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free (acc_proflib);
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acc_proflibs = acc_proflibs_sep + 1;
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}
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else
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acc_proflibs = NULL;
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}
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#endif /* PLUGIN_SUPPORT */
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}
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void
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acc_prof_register (acc_event_t ev, acc_prof_callback cb, acc_register_t reg)
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{
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gomp_debug (0, "%s: ev=%d, cb=%p, reg=%d\n",
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__FUNCTION__, (int) ev, (void *) cb, (int) reg);
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/* For any events to be dispatched, the user first has to register a
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callback, which makes this here a good place for enabling the whole
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machinery. */
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if (!GOACC_PROF_ENABLED)
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__atomic_store_n (&goacc_prof_enabled, true, MEMMODEL_RELEASE);
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enum
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{
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EVENT_KIND_BOGUS,
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EVENT_KIND_NORMAL,
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/* As end events invoke callbacks in the reverse order, we register these
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in the reverse order here. */
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EVENT_KIND_END,
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} event_kind = EVENT_KIND_BOGUS;
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switch (ev)
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{
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case acc_ev_none:
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case acc_ev_device_init_start:
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case acc_ev_device_shutdown_start:
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case acc_ev_runtime_shutdown:
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case acc_ev_create:
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case acc_ev_delete:
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case acc_ev_alloc:
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case acc_ev_free:
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case acc_ev_enter_data_start:
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case acc_ev_exit_data_start:
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case acc_ev_update_start:
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case acc_ev_compute_construct_start:
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case acc_ev_enqueue_launch_start:
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case acc_ev_enqueue_upload_start:
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case acc_ev_enqueue_download_start:
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case acc_ev_wait_start:
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event_kind = EVENT_KIND_NORMAL;
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break;
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case acc_ev_device_init_end:
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case acc_ev_device_shutdown_end:
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case acc_ev_enter_data_end:
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case acc_ev_exit_data_end:
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case acc_ev_update_end:
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case acc_ev_compute_construct_end:
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case acc_ev_enqueue_launch_end:
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case acc_ev_enqueue_upload_end:
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case acc_ev_enqueue_download_end:
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case acc_ev_wait_end:
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event_kind = EVENT_KIND_END;
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break;
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case acc_ev_last:
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break;
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}
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if (event_kind == EVENT_KIND_BOGUS)
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{
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/* Silently ignore. */
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gomp_debug (0, " ignoring request for bogus 'acc_event_t'\n");
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return;
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}
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bool bogus = true;
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switch (reg)
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{
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case acc_reg:
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case acc_toggle:
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case acc_toggle_per_thread:
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bogus = false;
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break;
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}
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if (bogus)
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{
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/* Silently ignore. */
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gomp_debug (0, " ignoring request with bogus 'acc_register_t'\n");
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return;
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}
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/* Special cases. */
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if (reg == acc_toggle)
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{
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if (cb == NULL)
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{
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gomp_debug (0, " globally enabling callbacks\n");
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gomp_mutex_lock (&goacc_prof_lock);
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/* For 'acc_ev_none', this acts as a global toggle. */
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goacc_prof_callbacks_enabled[ev] = true;
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gomp_mutex_unlock (&goacc_prof_lock);
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return;
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}
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else if (ev == acc_ev_none && cb != NULL)
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{
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gomp_debug (0, " ignoring request\n");
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return;
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}
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}
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else if (reg == acc_toggle_per_thread)
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{
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if (ev == acc_ev_none && cb == NULL)
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{
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gomp_debug (0, " thread: enabling callbacks\n");
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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thr->prof_callbacks_enabled = true;
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return;
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}
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/* Silently ignore. */
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gomp_debug (0, " ignoring bogus request\n");
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return;
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}
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gomp_mutex_lock (&goacc_prof_lock);
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struct goacc_prof_callback_entry *it, *it_p;
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it = goacc_prof_callback_entries[ev];
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it_p = NULL;
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while (it)
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{
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if (it->cb == cb)
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break;
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it_p = it;
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it = it->next;
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}
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switch (reg)
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{
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case acc_reg:
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/* If we already have this callback registered, just increment its
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reference count. */
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if (it != NULL)
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{
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it->ref++;
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gomp_debug (0, " already registered;"
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" incrementing reference count to: %d\n", it->ref);
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}
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else
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{
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struct goacc_prof_callback_entry *e
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= gomp_malloc (sizeof (struct goacc_prof_callback_entry));
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e->cb = cb;
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e->ref = 1;
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e->enabled = true;
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bool prepend = (event_kind == EVENT_KIND_END);
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/* If we don't have any callback registered yet, also use the
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'prepend' code path. */
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if (it_p == NULL)
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prepend = true;
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if (prepend)
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{
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gomp_debug (0, " prepending\n");
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e->next = goacc_prof_callback_entries[ev];
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goacc_prof_callback_entries[ev] = e;
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}
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else
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{
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gomp_debug (0, " appending\n");
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e->next = NULL;
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it_p->next = e;
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}
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}
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break;
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case acc_toggle:
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if (it == NULL)
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{
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gomp_debug (0, " ignoring request: is not registered\n");
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break;
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}
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else
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{
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gomp_debug (0, " enabling\n");
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it->enabled = true;
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}
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break;
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case acc_toggle_per_thread:
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__builtin_unreachable ();
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}
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gomp_mutex_unlock (&goacc_prof_lock);
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}
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void
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acc_prof_unregister (acc_event_t ev, acc_prof_callback cb, acc_register_t reg)
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{
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gomp_debug (0, "%s: ev=%d, cb=%p, reg=%d\n",
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__FUNCTION__, (int) ev, (void *) cb, (int) reg);
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/* If profiling is not enabled, there cannot be anything to unregister. */
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if (!GOACC_PROF_ENABLED)
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return;
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if (ev < acc_ev_none
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|| ev >= acc_ev_last)
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{
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/* Silently ignore. */
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gomp_debug (0, " ignoring request for bogus 'acc_event_t'\n");
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return;
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}
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bool bogus = true;
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switch (reg)
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{
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case acc_reg:
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case acc_toggle:
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case acc_toggle_per_thread:
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bogus = false;
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break;
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}
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if (bogus)
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{
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/* Silently ignore. */
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gomp_debug (0, " ignoring request with bogus 'acc_register_t'\n");
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return;
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}
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/* Special cases. */
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if (reg == acc_toggle)
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{
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if (cb == NULL)
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{
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gomp_debug (0, " globally disabling callbacks\n");
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gomp_mutex_lock (&goacc_prof_lock);
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/* For 'acc_ev_none', this acts as a global toggle. */
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goacc_prof_callbacks_enabled[ev] = false;
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gomp_mutex_unlock (&goacc_prof_lock);
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return;
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}
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else if (ev == acc_ev_none && cb != NULL)
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{
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gomp_debug (0, " ignoring request\n");
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return;
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}
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}
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else if (reg == acc_toggle_per_thread)
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{
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if (ev == acc_ev_none && cb == NULL)
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{
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gomp_debug (0, " thread: disabling callbacks\n");
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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thr->prof_callbacks_enabled = false;
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return;
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}
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/* Silently ignore. */
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gomp_debug (0, " ignoring bogus request\n");
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return;
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}
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gomp_mutex_lock (&goacc_prof_lock);
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struct goacc_prof_callback_entry *it, *it_p;
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it = goacc_prof_callback_entries[ev];
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it_p = NULL;
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while (it)
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{
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if (it->cb == cb)
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break;
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it_p = it;
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it = it->next;
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}
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switch (reg)
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{
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case acc_reg:
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if (it == NULL)
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{
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/* Silently ignore. */
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gomp_debug (0, " ignoring bogus request: is not registered\n");
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break;
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}
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it->ref--;
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gomp_debug (0, " decrementing reference count to: %d\n", it->ref);
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if (it->ref == 0)
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{
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if (it_p == NULL)
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goacc_prof_callback_entries[ev] = it->next;
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else
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it_p->next = it->next;
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free (it);
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}
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break;
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case acc_toggle:
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if (it == NULL)
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{
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gomp_debug (0, " ignoring request: is not registered\n");
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break;
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}
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else
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{
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gomp_debug (0, " disabling\n");
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it->enabled = false;
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}
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break;
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case acc_toggle_per_thread:
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__builtin_unreachable ();
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}
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gomp_mutex_unlock (&goacc_prof_lock);
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}
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acc_query_fn
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acc_prof_lookup (const char *name)
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{
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gomp_debug (0, "%s (%s)\n",
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__FUNCTION__, name ?: "NULL");
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return NULL;
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}
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void
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acc_register_library (acc_prof_reg reg, acc_prof_reg unreg,
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acc_prof_lookup_func lookup)
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{
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gomp_fatal ("TODO");
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}
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/* Prepare to dispatch events? */
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bool
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_goacc_profiling_dispatch_p (bool check_not_nested_p)
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{
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gomp_debug (0, "%s\n", __FUNCTION__);
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bool ret;
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struct goacc_thread *thr = goacc_thread ();
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if (__builtin_expect (thr == NULL, false))
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{
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/* If we don't have any per-thread state yet, that means that per-thread
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callback dispatch has not been explicitly disabled (which only a call
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to 'acc_prof_unregister' with 'acc_toggle_per_thread' would do, and
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that would have allocated per-thread state via
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'goacc_lazy_initialize'); initially, all callbacks for all events are
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enabled. */
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gomp_debug (0, " %s: don't have any per-thread state yet\n", __FUNCTION__);
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}
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else
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{
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if (check_not_nested_p)
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{
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/* No nesting. */
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assert (thr->prof_info == NULL);
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assert (thr->api_info == NULL);
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}
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if (__builtin_expect (!thr->prof_callbacks_enabled, true))
|
|
{
|
|
gomp_debug (0, " %s: disabled for this thread\n", __FUNCTION__);
|
|
ret = false;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
gomp_mutex_lock (&goacc_prof_lock);
|
|
|
|
/* 'goacc_prof_callbacks_enabled[acc_ev_none]' acts as a global toggle. */
|
|
if (__builtin_expect (!goacc_prof_callbacks_enabled[acc_ev_none], true))
|
|
{
|
|
gomp_debug (0, " %s: disabled globally\n", __FUNCTION__);
|
|
ret = false;
|
|
goto out_unlock;
|
|
}
|
|
else
|
|
ret = true;
|
|
|
|
out_unlock:
|
|
gomp_mutex_unlock (&goacc_prof_lock);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/* Set up to dispatch events? */
|
|
|
|
bool
|
|
_goacc_profiling_setup_p (struct goacc_thread *thr,
|
|
acc_prof_info *prof_info, acc_api_info *api_info)
|
|
{
|
|
gomp_debug (0, "%s (%p)\n", __FUNCTION__, thr);
|
|
|
|
/* If we don't have any per-thread state yet, we can't register 'prof_info'
|
|
and 'api_info'. */
|
|
if (__builtin_expect (thr == NULL, false))
|
|
{
|
|
gomp_debug (0, "Can't dispatch OpenACC Profiling Interface events for"
|
|
" the current call, construct, or directive\n");
|
|
return false;
|
|
}
|
|
|
|
if (thr->prof_info != NULL)
|
|
{
|
|
/* Profiling has already been set up for an outer construct. In this
|
|
case, we continue to use the existing information, and thus return
|
|
'false' here.
|
|
|
|
This can happen, for example, for an 'enter data' directive, which
|
|
sets up profiling, then calls into 'acc_copyin', which should not
|
|
again set up profiling, should not overwrite the existing
|
|
information. */
|
|
return false;
|
|
}
|
|
|
|
thr->prof_info = prof_info;
|
|
thr->api_info = api_info;
|
|
|
|
/* Fill in some defaults. */
|
|
|
|
prof_info->event_type = -1; /* Must be set later. */
|
|
prof_info->valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
|
|
prof_info->version = _ACC_PROF_INFO_VERSION;
|
|
if (thr->dev)
|
|
{
|
|
prof_info->device_type = acc_device_type (thr->dev->type);
|
|
prof_info->device_number = thr->dev->target_id;
|
|
}
|
|
else
|
|
{
|
|
prof_info->device_type = -1;
|
|
prof_info->device_number = -1;
|
|
}
|
|
prof_info->thread_id = -1;
|
|
prof_info->async = acc_async_sync;
|
|
prof_info->async_queue = prof_info->async;
|
|
prof_info->src_file = NULL;
|
|
prof_info->func_name = NULL;
|
|
prof_info->line_no = -1;
|
|
prof_info->end_line_no = -1;
|
|
prof_info->func_line_no = -1;
|
|
prof_info->func_end_line_no = -1;
|
|
|
|
api_info->device_api = acc_device_api_none;
|
|
api_info->valid_bytes = _ACC_API_INFO_VALID_BYTES;
|
|
api_info->device_type = prof_info->device_type;
|
|
api_info->vendor = -1;
|
|
api_info->device_handle = NULL;
|
|
api_info->context_handle = NULL;
|
|
api_info->async_handle = NULL;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Dispatch events.
|
|
|
|
This must only be called if 'GOACC_PROFILING_DISPATCH_P' or
|
|
'GOACC_PROFILING_SETUP_P' returned a true result. */
|
|
|
|
void
|
|
goacc_profiling_dispatch (acc_prof_info *prof_info, acc_event_info *event_info,
|
|
acc_api_info *apt_info)
|
|
{
|
|
acc_event_t event_type = event_info->event_type;
|
|
gomp_debug (0, "%s: event_type=%d\n", __FUNCTION__, (int) event_type);
|
|
assert (event_type > acc_ev_none
|
|
&& event_type < acc_ev_last);
|
|
|
|
gomp_mutex_lock (&goacc_prof_lock);
|
|
|
|
if (!goacc_prof_callbacks_enabled[event_type])
|
|
{
|
|
gomp_debug (0, " disabled for this event type\n");
|
|
|
|
goto out_unlock;
|
|
}
|
|
|
|
for (struct goacc_prof_callback_entry *e
|
|
= goacc_prof_callback_entries[event_type];
|
|
e != NULL;
|
|
e = e->next)
|
|
{
|
|
if (!e->enabled)
|
|
{
|
|
gomp_debug (0, " disabled for callback %p\n", e->cb);
|
|
continue;
|
|
}
|
|
|
|
gomp_debug (0, " calling callback %p\n", e->cb);
|
|
e->cb (prof_info, event_info, apt_info);
|
|
}
|
|
|
|
out_unlock:
|
|
gomp_mutex_unlock (&goacc_prof_lock);
|
|
}
|