libgomp/oacc-parallel.c

   1 /* Copyright (C) 2013-2024 Free Software Foundation, Inc.
   2
   3    Contributed by Mentor Embedded.
   4
   5    This file is part of the GNU Offloading and Multi Processing Library
   6    (libgomp).
   7
   8    Libgomp is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  14    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16    more details.
  17
  18    Under Section 7 of GPL version 3, you are granted additional
  19    permissions described in the GCC Runtime Library Exception, version
  20    3.1, as published by the Free Software Foundation.
  21
  22    You should have received a copy of the GNU General Public License and
  23    a copy of the GCC Runtime Library Exception along with this program;
  24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25    <http://www.gnu.org/licenses/>.  */
  26
  27 /* This file handles OpenACC constructs.  */
  28
  29 #include "openacc.h"
  30 #include "libgomp.h"
  31 #include "gomp-constants.h"
  32 #include "oacc-int.h"
  33 #ifdef HAVE_INTTYPES_H
  34 # include <inttypes.h>  /* For PRIu64.  */
  35 #endif
  36 #include <string.h>
  37 #include <stdarg.h>
  38 #include <assert.h>
  39
  40
  41 /* In the ABI, the GOACC_FLAGs are encoded as an inverted bitmask, so that we
  42    continue to support the following two legacy values.  */
  43 _Static_assert (GOACC_FLAGS_UNMARSHAL (GOMP_DEVICE_ICV) == 0,
  44                 "legacy GOMP_DEVICE_ICV broken");
  45 _Static_assert (GOACC_FLAGS_UNMARSHAL (GOMP_DEVICE_HOST_FALLBACK)
  46                 == GOACC_FLAG_HOST_FALLBACK,
  47                 "legacy GOMP_DEVICE_HOST_FALLBACK broken");
  48
  49
  50 /* Handle the mapping pair that are presented when a
  51    deviceptr clause is used with Fortran.  */
  52
  53 static void
  54 handle_ftn_pointers (size_t mapnum, void **hostaddrs, size_t *sizes,
  55                      unsigned short *kinds)
  56 {
  57   int i;
  58
  59   for (i = 0; i < mapnum; i++)
  60     {
  61       unsigned short kind1 = kinds[i] & 0xff;
  62
  63       /* Handle Fortran deviceptr clause.  */
  64       if (kind1 == GOMP_MAP_FORCE_DEVICEPTR)
  65         {
  66           unsigned short kind2;
  67
  68           if (i < (signed)mapnum - 1)
  69             kind2 = kinds[i + 1] & 0xff;
  70           else
  71             kind2 = 0xffff;
  72
  73           if (sizes[i] == sizeof (void *))
  74             continue;
  75
  76           /* At this point, we're dealing with a Fortran deviceptr.
  77              If the next element is not what we're expecting, then
  78              this is an instance of where the deviceptr variable was
  79              not used within the region and the pointer was removed
  80              by the gimplifier.  */
  81           if (kind2 == GOMP_MAP_POINTER
  82               && sizes[i + 1] == 0
  83               && hostaddrs[i] == *(void **)hostaddrs[i + 1])
  84             {
  85               kinds[i+1] = kinds[i];
  86               sizes[i+1] = sizeof (void *);
  87             }
  88
  89           /* Invalidate the entry.  */
  90           hostaddrs[i] = NULL;
  91         }
  92     }
  93 }
  94
  95
  96 /* Launch a possibly offloaded function with FLAGS.  FN is the host fn
  97    address.  MAPNUM, HOSTADDRS, SIZES & KINDS  describe the memory
  98    blocks to be copied to/from the device.  Varadic arguments are
  99    keyed optional parameters terminated with a zero.  */
 100
 101 void
 102 GOACC_parallel_keyed (int flags_m, void (*fn) (void *),
 103                       size_t mapnum, void **hostaddrs, size_t *sizes,
 104                       unsigned short *kinds, ...)
 105 {
 106   int flags = GOACC_FLAGS_UNMARSHAL (flags_m);
 107
 108   va_list ap;
 109   struct goacc_thread *thr;
 110   struct gomp_device_descr *acc_dev;
 111   unsigned int i;
 112   struct splay_tree_key_s k;
 113   splay_tree_key tgt_fn_key;
 114   void (*tgt_fn);
 115   int async = GOMP_ASYNC_SYNC;
 116   unsigned dims[GOMP_DIM_MAX];
 117   unsigned tag;
 118
 119 #ifdef HAVE_INTTYPES_H
 120   gomp_debug (0, "%s: mapnum=%"PRIu64", hostaddrs=%p, size=%p, kinds=%p\n",
 121               __FUNCTION__, (uint64_t) mapnum, hostaddrs, sizes, kinds);
 122 #else
 123   gomp_debug (0, "%s: mapnum=%lu, hostaddrs=%p, sizes=%p, kinds=%p\n",
 124               __FUNCTION__, (unsigned long) mapnum, hostaddrs, sizes, kinds);
 125 #endif
 126   goacc_lazy_initialize ();
 127
 128   thr = goacc_thread ();
 129   acc_dev = thr->dev;
 130
 131   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 132
 133   acc_prof_info prof_info;
 134   if (profiling_p)
 135     {
 136       thr->prof_info = &prof_info;
 137
 138       prof_info.event_type = acc_ev_compute_construct_start;
 139       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 140       prof_info.version = _ACC_PROF_INFO_VERSION;
 141       prof_info.device_type = acc_device_type (acc_dev->type);
 142       prof_info.device_number = acc_dev->target_id;
 143       prof_info.thread_id = -1;
 144       prof_info.async = async;
 145       prof_info.async_queue = prof_info.async;
 146       prof_info.src_file = NULL;
 147       prof_info.func_name = NULL;
 148       prof_info.line_no = -1;
 149       prof_info.end_line_no = -1;
 150       prof_info.func_line_no = -1;
 151       prof_info.func_end_line_no = -1;
 152     }
 153   acc_event_info compute_construct_event_info;
 154   if (profiling_p)
 155     {
 156       compute_construct_event_info.other_event.event_type
 157         = prof_info.event_type;
 158       compute_construct_event_info.other_event.valid_bytes
 159         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 160       compute_construct_event_info.other_event.parent_construct
 161         = acc_construct_parallel;
 162       compute_construct_event_info.other_event.implicit = 0;
 163       compute_construct_event_info.other_event.tool_info = NULL;
 164     }
 165   acc_api_info api_info;
 166   if (profiling_p)
 167     {
 168       thr->api_info = &api_info;
 169
 170       api_info.device_api = acc_device_api_none;
 171       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 172       api_info.device_type = prof_info.device_type;
 173       api_info.vendor = -1;
 174       api_info.device_handle = NULL;
 175       api_info.context_handle = NULL;
 176       api_info.async_handle = NULL;
 177     }
 178
 179   if (profiling_p)
 180     goacc_profiling_dispatch (&prof_info, &compute_construct_event_info,
 181                               &api_info);
 182
 183   handle_ftn_pointers (mapnum, hostaddrs, sizes, kinds);
 184
 185   /* Host fallback if "if" clause is false or if the current device is set to
 186      the host.  */
 187   if ((flags & GOACC_FLAG_HOST_FALLBACK)
 188       /* TODO: a proper pthreads based "multi-core CPU" local device
 189          implementation. Currently, this is still the same as host-fallback.  */
 190       || (flags & GOACC_FLAG_LOCAL_DEVICE))
 191     {
 192       prof_info.device_type = acc_device_host;
 193       api_info.device_type = prof_info.device_type;
 194       goacc_save_and_set_bind (acc_device_host);
 195       fn (hostaddrs);
 196       goacc_restore_bind ();
 197       goto out_prof;
 198     }
 199   else if (acc_device_type (acc_dev->type) == acc_device_host)
 200     {
 201       fn (hostaddrs);
 202       goto out_prof;
 203     }
 204
 205   /* Default: let the runtime choose.  */
 206   for (i = 0; i != GOMP_DIM_MAX; i++)
 207     dims[i] = 0;
 208
 209   va_start (ap, kinds);
 210   /* TODO: This will need amending when device_type is implemented.  */
 211   while ((tag = va_arg (ap, unsigned)) != 0)
 212     {
 213       if (GOMP_LAUNCH_DEVICE (tag))
 214         gomp_fatal ("device_type '%d' offload parameters, libgomp is too old",
 215                     GOMP_LAUNCH_DEVICE (tag));
 216
 217       switch (GOMP_LAUNCH_CODE (tag))
 218         {
 219         case GOMP_LAUNCH_DIM:
 220           {
 221             unsigned mask = GOMP_LAUNCH_OP (tag);
 222
 223             for (i = 0; i != GOMP_DIM_MAX; i++)
 224               if (mask & GOMP_DIM_MASK (i))
 225                 dims[i] = va_arg (ap, unsigned);
 226           }
 227           break;
 228
 229         case GOMP_LAUNCH_ASYNC:
 230           {
 231             /* Small constant values are encoded in the operand.  */
 232             async = GOMP_LAUNCH_OP (tag);
 233
 234             if (async == GOMP_LAUNCH_OP_MAX)
 235               async = va_arg (ap, unsigned);
 236
 237             if (profiling_p)
 238               {
 239                 prof_info.async = async;
 240                 prof_info.async_queue = prof_info.async;
 241               }
 242
 243             break;
 244           }
 245
 246         case GOMP_LAUNCH_WAIT:
 247           {
 248             unsigned num_waits = GOMP_LAUNCH_OP (tag);
 249             goacc_wait (async, num_waits, &ap);
 250             break;
 251           }
 252
 253         default:
 254           gomp_fatal ("unrecognized offload code '%d',"
 255                       " libgomp is too old", GOMP_LAUNCH_CODE (tag));
 256         }
 257     }
 258   va_end (ap);
 259
 260   if (!(acc_dev->capabilities & GOMP_OFFLOAD_CAP_NATIVE_EXEC))
 261     {
 262       k.host_start = (uintptr_t) fn;
 263       k.host_end = k.host_start + 1;
 264       gomp_mutex_lock (&acc_dev->lock);
 265       tgt_fn_key = splay_tree_lookup (&acc_dev->mem_map, &k);
 266       gomp_mutex_unlock (&acc_dev->lock);
 267
 268       if (tgt_fn_key == NULL)
 269         gomp_fatal ("target function wasn't mapped");
 270
 271       tgt_fn = (void (*)) tgt_fn_key->tgt_offset;
 272     }
 273   else
 274     tgt_fn = (void (*)) fn;
 275
 276   acc_event_info enter_exit_data_event_info;
 277   if (profiling_p)
 278     {
 279       prof_info.event_type = acc_ev_enter_data_start;
 280       enter_exit_data_event_info.other_event.event_type
 281         = prof_info.event_type;
 282       enter_exit_data_event_info.other_event.valid_bytes
 283         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 284       enter_exit_data_event_info.other_event.parent_construct
 285         = compute_construct_event_info.other_event.parent_construct;
 286       enter_exit_data_event_info.other_event.implicit = 1;
 287       enter_exit_data_event_info.other_event.tool_info = NULL;
 288       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 289                                 &api_info);
 290     }
 291
 292   goacc_aq aq = get_goacc_asyncqueue (async);
 293
 294   struct target_mem_desc *tgt
 295     = goacc_map_vars (acc_dev, aq, mapnum, hostaddrs, NULL, sizes, kinds, true,
 296                       GOMP_MAP_VARS_TARGET);
 297
 298   if (profiling_p)
 299     {
 300       prof_info.event_type = acc_ev_enter_data_end;
 301       enter_exit_data_event_info.other_event.event_type
 302         = prof_info.event_type;
 303       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 304                                 &api_info);
 305     }
 306
 307   void **devaddrs = (void **) tgt->tgt_start;
 308   if (aq == NULL)
 309     acc_dev->openacc.exec_func (tgt_fn, mapnum, hostaddrs, devaddrs, dims,
 310                                 tgt);
 311   else
 312     acc_dev->openacc.async.exec_func (tgt_fn, mapnum, hostaddrs, devaddrs,
 313                                       dims, tgt, aq);
 314
 315   if (profiling_p)
 316     {
 317       prof_info.event_type = acc_ev_exit_data_start;
 318       enter_exit_data_event_info.other_event.event_type = prof_info.event_type;
 319       enter_exit_data_event_info.other_event.tool_info = NULL;
 320       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 321                                 &api_info);
 322     }
 323
 324   /* If running synchronously (aq == NULL), this will unmap immediately.  */
 325   goacc_unmap_vars (tgt, true, aq);
 326
 327   if (profiling_p)
 328     {
 329       prof_info.event_type = acc_ev_exit_data_end;
 330       enter_exit_data_event_info.other_event.event_type = prof_info.event_type;
 331       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 332                                 &api_info);
 333     }
 334
 335  out_prof:
 336   if (profiling_p)
 337     {
 338       prof_info.event_type = acc_ev_compute_construct_end;
 339       compute_construct_event_info.other_event.event_type
 340         = prof_info.event_type;
 341       goacc_profiling_dispatch (&prof_info, &compute_construct_event_info,
 342                                 &api_info);
 343
 344       thr->prof_info = NULL;
 345       thr->api_info = NULL;
 346     }
 347 }
 348
 349 /* Legacy entry point (GCC 5).  Only provide host fallback execution.  */
 350
 351 void
 352 GOACC_parallel (int flags_m, void (*fn) (void *),
 353                 size_t mapnum, void **hostaddrs, size_t *sizes,
 354                 unsigned short *kinds,
 355                 int num_gangs, int num_workers, int vector_length,
 356                 int async, int num_waits, ...)
 357 {
 358   goacc_save_and_set_bind (acc_device_host);
 359   fn (hostaddrs);
 360   goacc_restore_bind ();
 361 }
 362
 363 void
 364 GOACC_data_start (int flags_m, size_t mapnum,
 365                   void **hostaddrs, size_t *sizes, unsigned short *kinds)
 366 {
 367   int flags = GOACC_FLAGS_UNMARSHAL (flags_m);
 368
 369   struct target_mem_desc *tgt;
 370
 371 #ifdef HAVE_INTTYPES_H
 372   gomp_debug (0, "%s: mapnum=%"PRIu64", hostaddrs=%p, size=%p, kinds=%p\n",
 373               __FUNCTION__, (uint64_t) mapnum, hostaddrs, sizes, kinds);
 374 #else
 375   gomp_debug (0, "%s: mapnum=%lu, hostaddrs=%p, sizes=%p, kinds=%p\n",
 376               __FUNCTION__, (unsigned long) mapnum, hostaddrs, sizes, kinds);
 377 #endif
 378
 379   goacc_lazy_initialize ();
 380
 381   struct goacc_thread *thr = goacc_thread ();
 382   struct gomp_device_descr *acc_dev = thr->dev;
 383
 384   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 385
 386   acc_prof_info prof_info;
 387   if (profiling_p)
 388     {
 389       thr->prof_info = &prof_info;
 390
 391       prof_info.event_type = acc_ev_enter_data_start;
 392       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 393       prof_info.version = _ACC_PROF_INFO_VERSION;
 394       prof_info.device_type = acc_device_type (acc_dev->type);
 395       prof_info.device_number = acc_dev->target_id;
 396       prof_info.thread_id = -1;
 397       prof_info.async = acc_async_sync; /* Always synchronous.  */
 398       prof_info.async_queue = prof_info.async;
 399       prof_info.src_file = NULL;
 400       prof_info.func_name = NULL;
 401       prof_info.line_no = -1;
 402       prof_info.end_line_no = -1;
 403       prof_info.func_line_no = -1;
 404       prof_info.func_end_line_no = -1;
 405     }
 406   acc_event_info enter_data_event_info;
 407   if (profiling_p)
 408     {
 409       enter_data_event_info.other_event.event_type
 410         = prof_info.event_type;
 411       enter_data_event_info.other_event.valid_bytes
 412         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 413       enter_data_event_info.other_event.parent_construct = acc_construct_data;
 414       for (int i = 0; i < mapnum; ++i)
 415         if ((kinds[i] & 0xff) == GOMP_MAP_USE_DEVICE_PTR
 416             || (kinds[i] & 0xff) == GOMP_MAP_USE_DEVICE_PTR_IF_PRESENT)
 417           {
 418             /* If there is one such data mapping kind, then this is actually an
 419                OpenACC 'host_data' construct.  (GCC maps the OpenACC
 420                'host_data' construct to the OpenACC 'data' construct.)  Apart
 421                from artificial test cases (such as an OpenACC 'host_data'
 422                construct's (implicit) device initialization when there hasn't
 423                been any device data be set up before...), there can't really
 424                any meaningful events be generated from OpenACC 'host_data'
 425                constructs, though.  */
 426             enter_data_event_info.other_event.parent_construct
 427               = acc_construct_host_data;
 428             break;
 429           }
 430       enter_data_event_info.other_event.implicit = 0;
 431       enter_data_event_info.other_event.tool_info = NULL;
 432     }
 433   acc_api_info api_info;
 434   if (profiling_p)
 435     {
 436       thr->api_info = &api_info;
 437
 438       api_info.device_api = acc_device_api_none;
 439       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 440       api_info.device_type = prof_info.device_type;
 441       api_info.vendor = -1;
 442       api_info.device_handle = NULL;
 443       api_info.context_handle = NULL;
 444       api_info.async_handle = NULL;
 445     }
 446
 447   if (profiling_p)
 448     goacc_profiling_dispatch (&prof_info, &enter_data_event_info, &api_info);
 449
 450   /* Host fallback or 'do nothing'.  */
 451   if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
 452       || (flags & GOACC_FLAG_HOST_FALLBACK)
 453       || (flags & GOACC_FLAG_LOCAL_DEVICE))
 454     {
 455       prof_info.device_type = acc_device_host;
 456       api_info.device_type = prof_info.device_type;
 457       tgt = goacc_map_vars (NULL, NULL, 0, NULL, NULL, NULL, NULL, true, 0);
 458       tgt->prev = thr->mapped_data;
 459       thr->mapped_data = tgt;
 460
 461       goto out_prof;
 462     }
 463
 464   gomp_debug (0, "  %s: prepare mappings\n", __FUNCTION__);
 465   tgt = goacc_map_vars (acc_dev, NULL, mapnum, hostaddrs, NULL, sizes, kinds,
 466                         true, 0);
 467   gomp_debug (0, "  %s: mappings prepared\n", __FUNCTION__);
 468   tgt->prev = thr->mapped_data;
 469   thr->mapped_data = tgt;
 470
 471  out_prof:
 472   if (profiling_p)
 473     {
 474       prof_info.event_type = acc_ev_enter_data_end;
 475       enter_data_event_info.other_event.event_type = prof_info.event_type;
 476       goacc_profiling_dispatch (&prof_info, &enter_data_event_info, &api_info);
 477
 478       thr->prof_info = NULL;
 479       thr->api_info = NULL;
 480     }
 481 }
 482
 483 void
 484 GOACC_data_end (void)
 485 {
 486   struct goacc_thread *thr = goacc_thread ();
 487   struct gomp_device_descr *acc_dev = thr->dev;
 488   struct target_mem_desc *tgt = thr->mapped_data;
 489
 490   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 491
 492   acc_prof_info prof_info;
 493   if (profiling_p)
 494     {
 495       thr->prof_info = &prof_info;
 496
 497       prof_info.event_type = acc_ev_exit_data_start;
 498       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 499       prof_info.version = _ACC_PROF_INFO_VERSION;
 500       prof_info.device_type = acc_device_type (acc_dev->type);
 501       prof_info.device_number = acc_dev->target_id;
 502       prof_info.thread_id = -1;
 503       prof_info.async = acc_async_sync; /* Always synchronous.  */
 504       prof_info.async_queue = prof_info.async;
 505       prof_info.src_file = NULL;
 506       prof_info.func_name = NULL;
 507       prof_info.line_no = -1;
 508       prof_info.end_line_no = -1;
 509       prof_info.func_line_no = -1;
 510       prof_info.func_end_line_no = -1;
 511     }
 512   acc_event_info exit_data_event_info;
 513   if (profiling_p)
 514     {
 515       exit_data_event_info.other_event.event_type
 516         = prof_info.event_type;
 517       exit_data_event_info.other_event.valid_bytes
 518         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 519       exit_data_event_info.other_event.parent_construct = acc_construct_data;
 520       exit_data_event_info.other_event.implicit = 0;
 521       exit_data_event_info.other_event.tool_info = NULL;
 522     }
 523   acc_api_info api_info;
 524   if (profiling_p)
 525     {
 526       thr->api_info = &api_info;
 527
 528       api_info.device_api = acc_device_api_none;
 529       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 530       api_info.device_type = prof_info.device_type;
 531       api_info.vendor = -1;
 532       api_info.device_handle = NULL;
 533       api_info.context_handle = NULL;
 534       api_info.async_handle = NULL;
 535     }
 536
 537   if (profiling_p)
 538     goacc_profiling_dispatch (&prof_info, &exit_data_event_info, &api_info);
 539
 540   gomp_debug (0, "  %s: restore mappings\n", __FUNCTION__);
 541   thr->mapped_data = tgt->prev;
 542   goacc_unmap_vars (tgt, true, NULL);
 543   gomp_debug (0, "  %s: mappings restored\n", __FUNCTION__);
 544
 545   if (profiling_p)
 546     {
 547       prof_info.event_type = acc_ev_exit_data_end;
 548       exit_data_event_info.other_event.event_type = prof_info.event_type;
 549       goacc_profiling_dispatch (&prof_info, &exit_data_event_info, &api_info);
 550
 551       thr->prof_info = NULL;
 552       thr->api_info = NULL;
 553     }
 554 }
 555
 556 void
 557 GOACC_update (int flags_m, size_t mapnum,
 558               void **hostaddrs, size_t *sizes, unsigned short *kinds,
 559               int async, int num_waits, ...)
 560 {
 561   int flags = GOACC_FLAGS_UNMARSHAL (flags_m);
 562
 563   size_t i;
 564
 565   goacc_lazy_initialize ();
 566
 567   struct goacc_thread *thr = goacc_thread ();
 568   struct gomp_device_descr *acc_dev = thr->dev;
 569
 570   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 571
 572   acc_prof_info prof_info;
 573   if (profiling_p)
 574     {
 575       thr->prof_info = &prof_info;
 576
 577       prof_info.event_type = acc_ev_update_start;
 578       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 579       prof_info.version = _ACC_PROF_INFO_VERSION;
 580       prof_info.device_type = acc_device_type (acc_dev->type);
 581       prof_info.device_number = acc_dev->target_id;
 582       prof_info.thread_id = -1;
 583       prof_info.async = async;
 584       prof_info.async_queue = prof_info.async;
 585       prof_info.src_file = NULL;
 586       prof_info.func_name = NULL;
 587       prof_info.line_no = -1;
 588       prof_info.end_line_no = -1;
 589       prof_info.func_line_no = -1;
 590       prof_info.func_end_line_no = -1;
 591     }
 592   acc_event_info update_event_info;
 593   if (profiling_p)
 594     {
 595       update_event_info.other_event.event_type
 596         = prof_info.event_type;
 597       update_event_info.other_event.valid_bytes
 598         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 599       update_event_info.other_event.parent_construct = acc_construct_update;
 600       update_event_info.other_event.implicit = 0;
 601       update_event_info.other_event.tool_info = NULL;
 602     }
 603   acc_api_info api_info;
 604   if (profiling_p)
 605     {
 606       thr->api_info = &api_info;
 607
 608       api_info.device_api = acc_device_api_none;
 609       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 610       api_info.device_type = prof_info.device_type;
 611       api_info.vendor = -1;
 612       api_info.device_handle = NULL;
 613       api_info.context_handle = NULL;
 614       api_info.async_handle = NULL;
 615     }
 616
 617   if (profiling_p)
 618     goacc_profiling_dispatch (&prof_info, &update_event_info, &api_info);
 619
 620   if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
 621       || (flags & GOACC_FLAG_HOST_FALLBACK))
 622     {
 623       prof_info.device_type = acc_device_host;
 624       api_info.device_type = prof_info.device_type;
 625
 626       goto out_prof;
 627     }
 628
 629   if (num_waits)
 630     {
 631       va_list ap;
 632
 633       va_start (ap, num_waits);
 634       goacc_wait (async, num_waits, &ap);
 635       va_end (ap);
 636     }
 637
 638   bool update_device = false;
 639   for (i = 0; i < mapnum; ++i)
 640     {
 641       unsigned char kind = kinds[i] & 0xff;
 642
 643       switch (kind)
 644         {
 645         case GOMP_MAP_POINTER:
 646         case GOMP_MAP_TO_PSET:
 647           break;
 648
 649         case GOMP_MAP_ALWAYS_POINTER:
 650           if (update_device)
 651             {
 652               /* Save the contents of the host pointer.  */
 653               void *dptr = acc_deviceptr (hostaddrs[i-1]);
 654               uintptr_t t = *(uintptr_t *) hostaddrs[i];
 655
 656               /* Update the contents of the host pointer to reflect
 657                  the value of the allocated device memory in the
 658                  previous pointer.  */
 659               *(uintptr_t *) hostaddrs[i] = (uintptr_t)dptr;
 660               /* TODO: verify that we really cannot use acc_update_device_async
 661                  here.  */
 662               acc_update_device (hostaddrs[i], sizeof (uintptr_t));
 663
 664               /* Restore the host pointer.  */
 665               *(uintptr_t *) hostaddrs[i] = t;
 666               update_device = false;
 667             }
 668           break;
 669
 670         case GOMP_MAP_TO:
 671           if (!acc_is_present (hostaddrs[i], sizes[i]))
 672             {
 673               update_device = false;
 674               break;
 675             }
 676           /* Fallthru  */
 677         case GOMP_MAP_FORCE_TO:
 678           update_device = true;
 679           acc_update_device_async (hostaddrs[i], sizes[i], async);
 680           break;
 681
 682         case GOMP_MAP_FROM:
 683           if (!acc_is_present (hostaddrs[i], sizes[i]))
 684             {
 685               update_device = false;
 686               break;
 687             }
 688           /* Fallthru  */
 689         case GOMP_MAP_FORCE_FROM:
 690           update_device = false;
 691           acc_update_self_async (hostaddrs[i], sizes[i], async);
 692           break;
 693
 694         default:
 695           gomp_fatal (">>>> GOACC_update UNHANDLED kind 0x%.2x", kind);
 696           break;
 697         }
 698     }
 699
 700  out_prof:
 701   if (profiling_p)
 702     {
 703       prof_info.event_type = acc_ev_update_end;
 704       update_event_info.other_event.event_type = prof_info.event_type;
 705       goacc_profiling_dispatch (&prof_info, &update_event_info, &api_info);
 706
 707       thr->prof_info = NULL;
 708       thr->api_info = NULL;
 709     }
 710 }
 711
 712
 713 /* Legacy entry point (GCC 5).  */
 714
 715 int
 716 GOACC_get_num_threads (void)
 717 {
 718   return 1;
 719 }
 720
 721 /* Legacy entry point (GCC 5).  */
 722
 723 int
 724 GOACC_get_thread_num (void)
 725 {
 726   return 0;
 727 }