libgomp/oacc-parallel.c

   1 /* Copyright (C) 2013-2020 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   struct target_mem_desc *tgt;
 112   void **devaddrs;
 113   unsigned int i;
 114   struct splay_tree_key_s k;
 115   splay_tree_key tgt_fn_key;
 116   void (*tgt_fn);
 117   int async = GOMP_ASYNC_SYNC;
 118   unsigned dims[GOMP_DIM_MAX];
 119   unsigned tag;
 120
 121 #ifdef HAVE_INTTYPES_H
 122   gomp_debug (0, "%s: mapnum=%"PRIu64", hostaddrs=%p, size=%p, kinds=%p\n",
 123               __FUNCTION__, (uint64_t) mapnum, hostaddrs, sizes, kinds);
 124 #else
 125   gomp_debug (0, "%s: mapnum=%lu, hostaddrs=%p, sizes=%p, kinds=%p\n",
 126               __FUNCTION__, (unsigned long) mapnum, hostaddrs, sizes, kinds);
 127 #endif
 128   goacc_lazy_initialize ();
 129
 130   thr = goacc_thread ();
 131   acc_dev = thr->dev;
 132
 133   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 134
 135   acc_prof_info prof_info;
 136   if (profiling_p)
 137     {
 138       thr->prof_info = &prof_info;
 139
 140       prof_info.event_type = acc_ev_compute_construct_start;
 141       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 142       prof_info.version = _ACC_PROF_INFO_VERSION;
 143       prof_info.device_type = acc_device_type (acc_dev->type);
 144       prof_info.device_number = acc_dev->target_id;
 145       prof_info.thread_id = -1;
 146       prof_info.async = async;
 147       prof_info.async_queue = prof_info.async;
 148       prof_info.src_file = NULL;
 149       prof_info.func_name = NULL;
 150       prof_info.line_no = -1;
 151       prof_info.end_line_no = -1;
 152       prof_info.func_line_no = -1;
 153       prof_info.func_end_line_no = -1;
 154     }
 155   acc_event_info compute_construct_event_info;
 156   if (profiling_p)
 157     {
 158       compute_construct_event_info.other_event.event_type
 159         = prof_info.event_type;
 160       compute_construct_event_info.other_event.valid_bytes
 161         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 162       compute_construct_event_info.other_event.parent_construct
 163         = acc_construct_parallel;
 164       compute_construct_event_info.other_event.implicit = 0;
 165       compute_construct_event_info.other_event.tool_info = NULL;
 166     }
 167   acc_api_info api_info;
 168   if (profiling_p)
 169     {
 170       thr->api_info = &api_info;
 171
 172       api_info.device_api = acc_device_api_none;
 173       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 174       api_info.device_type = prof_info.device_type;
 175       api_info.vendor = -1;
 176       api_info.device_handle = NULL;
 177       api_info.context_handle = NULL;
 178       api_info.async_handle = NULL;
 179     }
 180
 181   if (profiling_p)
 182     goacc_profiling_dispatch (&prof_info, &compute_construct_event_info,
 183                               &api_info);
 184
 185   handle_ftn_pointers (mapnum, hostaddrs, sizes, kinds);
 186
 187   /* Host fallback if "if" clause is false or if the current device is set to
 188      the host.  */
 189   if (flags & GOACC_FLAG_HOST_FALLBACK)
 190     {
 191       prof_info.device_type = acc_device_host;
 192       api_info.device_type = prof_info.device_type;
 193       goacc_save_and_set_bind (acc_device_host);
 194       fn (hostaddrs);
 195       goacc_restore_bind ();
 196       goto out_prof;
 197     }
 198   else if (acc_device_type (acc_dev->type) == acc_device_host)
 199     {
 200       fn (hostaddrs);
 201       goto out_prof;
 202     }
 203
 204   /* Default: let the runtime choose.  */
 205   for (i = 0; i != GOMP_DIM_MAX; i++)
 206     dims[i] = 0;
 207
 208   va_start (ap, kinds);
 209   /* TODO: This will need amending when device_type is implemented.  */
 210   while ((tag = va_arg (ap, unsigned)) != 0)
 211     {
 212       if (GOMP_LAUNCH_DEVICE (tag))
 213         gomp_fatal ("device_type '%d' offload parameters, libgomp is too old",
 214                     GOMP_LAUNCH_DEVICE (tag));
 215
 216       switch (GOMP_LAUNCH_CODE (tag))
 217         {
 218         case GOMP_LAUNCH_DIM:
 219           {
 220             unsigned mask = GOMP_LAUNCH_OP (tag);
 221
 222             for (i = 0; i != GOMP_DIM_MAX; i++)
 223               if (mask & GOMP_DIM_MASK (i))
 224                 dims[i] = va_arg (ap, unsigned);
 225           }
 226           break;
 227
 228         case GOMP_LAUNCH_ASYNC:
 229           {
 230             /* Small constant values are encoded in the operand.  */
 231             async = GOMP_LAUNCH_OP (tag);
 232
 233             if (async == GOMP_LAUNCH_OP_MAX)
 234               async = va_arg (ap, unsigned);
 235
 236             if (profiling_p)
 237               {
 238                 prof_info.async = async;
 239                 prof_info.async_queue = prof_info.async;
 240               }
 241
 242             break;
 243           }
 244
 245         case GOMP_LAUNCH_WAIT:
 246           {
 247             unsigned num_waits = GOMP_LAUNCH_OP (tag);
 248             goacc_wait (async, num_waits, &ap);
 249             break;
 250           }
 251
 252         default:
 253           gomp_fatal ("unrecognized offload code '%d',"
 254                       " libgomp is too old", GOMP_LAUNCH_CODE (tag));
 255         }
 256     }
 257   va_end (ap);
 258
 259   if (!(acc_dev->capabilities & GOMP_OFFLOAD_CAP_NATIVE_EXEC))
 260     {
 261       k.host_start = (uintptr_t) fn;
 262       k.host_end = k.host_start + 1;
 263       gomp_mutex_lock (&acc_dev->lock);
 264       tgt_fn_key = splay_tree_lookup (&acc_dev->mem_map, &k);
 265       gomp_mutex_unlock (&acc_dev->lock);
 266
 267       if (tgt_fn_key == NULL)
 268         gomp_fatal ("target function wasn't mapped");
 269
 270       tgt_fn = (void (*)) tgt_fn_key->tgt_offset;
 271     }
 272   else
 273     tgt_fn = (void (*)) fn;
 274
 275   acc_event_info enter_exit_data_event_info;
 276   if (profiling_p)
 277     {
 278       prof_info.event_type = acc_ev_enter_data_start;
 279       enter_exit_data_event_info.other_event.event_type
 280         = prof_info.event_type;
 281       enter_exit_data_event_info.other_event.valid_bytes
 282         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 283       enter_exit_data_event_info.other_event.parent_construct
 284         = compute_construct_event_info.other_event.parent_construct;
 285       enter_exit_data_event_info.other_event.implicit = 1;
 286       enter_exit_data_event_info.other_event.tool_info = NULL;
 287       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 288                                 &api_info);
 289     }
 290
 291   goacc_aq aq = get_goacc_asyncqueue (async);
 292
 293   tgt = gomp_map_vars_async (acc_dev, aq, mapnum, hostaddrs, NULL, sizes, kinds,
 294                              true, GOMP_MAP_VARS_OPENACC);
 295   if (profiling_p)
 296     {
 297       prof_info.event_type = acc_ev_enter_data_end;
 298       enter_exit_data_event_info.other_event.event_type
 299         = prof_info.event_type;
 300       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 301                                 &api_info);
 302     }
 303
 304   devaddrs = gomp_alloca (sizeof (void *) * mapnum);
 305   for (i = 0; i < mapnum; i++)
 306     devaddrs[i] = (void *) gomp_map_val (tgt, hostaddrs, i);
 307
 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, unmap immediately.  */
 325   if (aq == NULL)
 326     gomp_unmap_vars (tgt, true);
 327   else
 328     gomp_unmap_vars_async (tgt, true, aq);
 329
 330   if (profiling_p)
 331     {
 332       prof_info.event_type = acc_ev_exit_data_end;
 333       enter_exit_data_event_info.other_event.event_type = prof_info.event_type;
 334       goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
 335                                 &api_info);
 336     }
 337
 338  out_prof:
 339   if (profiling_p)
 340     {
 341       prof_info.event_type = acc_ev_compute_construct_end;
 342       compute_construct_event_info.other_event.event_type
 343         = prof_info.event_type;
 344       goacc_profiling_dispatch (&prof_info, &compute_construct_event_info,
 345                                 &api_info);
 346
 347       thr->prof_info = NULL;
 348       thr->api_info = NULL;
 349     }
 350 }
 351
 352 /* Legacy entry point (GCC 5).  Only provide host fallback execution.  */
 353
 354 void
 355 GOACC_parallel (int flags_m, void (*fn) (void *),
 356                 size_t mapnum, void **hostaddrs, size_t *sizes,
 357                 unsigned short *kinds,
 358                 int num_gangs, int num_workers, int vector_length,
 359                 int async, int num_waits, ...)
 360 {
 361   goacc_save_and_set_bind (acc_device_host);
 362   fn (hostaddrs);
 363   goacc_restore_bind ();
 364 }
 365
 366 void
 367 GOACC_data_start (int flags_m, size_t mapnum,
 368                   void **hostaddrs, size_t *sizes, unsigned short *kinds)
 369 {
 370   int flags = GOACC_FLAGS_UNMARSHAL (flags_m);
 371
 372   struct target_mem_desc *tgt;
 373
 374 #ifdef HAVE_INTTYPES_H
 375   gomp_debug (0, "%s: mapnum=%"PRIu64", hostaddrs=%p, size=%p, kinds=%p\n",
 376               __FUNCTION__, (uint64_t) mapnum, hostaddrs, sizes, kinds);
 377 #else
 378   gomp_debug (0, "%s: mapnum=%lu, hostaddrs=%p, sizes=%p, kinds=%p\n",
 379               __FUNCTION__, (unsigned long) mapnum, hostaddrs, sizes, kinds);
 380 #endif
 381
 382   goacc_lazy_initialize ();
 383
 384   struct goacc_thread *thr = goacc_thread ();
 385   struct gomp_device_descr *acc_dev = thr->dev;
 386
 387   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 388
 389   acc_prof_info prof_info;
 390   if (profiling_p)
 391     {
 392       thr->prof_info = &prof_info;
 393
 394       prof_info.event_type = acc_ev_enter_data_start;
 395       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 396       prof_info.version = _ACC_PROF_INFO_VERSION;
 397       prof_info.device_type = acc_device_type (acc_dev->type);
 398       prof_info.device_number = acc_dev->target_id;
 399       prof_info.thread_id = -1;
 400       prof_info.async = acc_async_sync; /* Always synchronous.  */
 401       prof_info.async_queue = prof_info.async;
 402       prof_info.src_file = NULL;
 403       prof_info.func_name = NULL;
 404       prof_info.line_no = -1;
 405       prof_info.end_line_no = -1;
 406       prof_info.func_line_no = -1;
 407       prof_info.func_end_line_no = -1;
 408     }
 409   acc_event_info enter_data_event_info;
 410   if (profiling_p)
 411     {
 412       enter_data_event_info.other_event.event_type
 413         = prof_info.event_type;
 414       enter_data_event_info.other_event.valid_bytes
 415         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 416       enter_data_event_info.other_event.parent_construct = acc_construct_data;
 417       for (int i = 0; i < mapnum; ++i)
 418         if ((kinds[i] & 0xff) == GOMP_MAP_USE_DEVICE_PTR)
 419           {
 420             /* If there is one such data mapping kind, then this is actually an
 421                OpenACC 'host_data' construct.  (GCC maps the OpenACC
 422                'host_data' construct to the OpenACC 'data' construct.)  Apart
 423                from artificial test cases (such as an OpenACC 'host_data'
 424                construct's (implicit) device initialization when there hasn't
 425                been any device data be set up before...), there can't really
 426                any meaningful events be generated from OpenACC 'host_data'
 427                constructs, though.  */
 428             enter_data_event_info.other_event.parent_construct
 429               = acc_construct_host_data;
 430             break;
 431           }
 432       enter_data_event_info.other_event.implicit = 0;
 433       enter_data_event_info.other_event.tool_info = NULL;
 434     }
 435   acc_api_info api_info;
 436   if (profiling_p)
 437     {
 438       thr->api_info = &api_info;
 439
 440       api_info.device_api = acc_device_api_none;
 441       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 442       api_info.device_type = prof_info.device_type;
 443       api_info.vendor = -1;
 444       api_info.device_handle = NULL;
 445       api_info.context_handle = NULL;
 446       api_info.async_handle = NULL;
 447     }
 448
 449   if (profiling_p)
 450     goacc_profiling_dispatch (&prof_info, &enter_data_event_info, &api_info);
 451
 452   /* Host fallback or 'do nothing'.  */
 453   if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
 454       || (flags & GOACC_FLAG_HOST_FALLBACK))
 455     {
 456       prof_info.device_type = acc_device_host;
 457       api_info.device_type = prof_info.device_type;
 458       tgt = gomp_map_vars (NULL, 0, NULL, NULL, NULL, NULL, true,
 459                            GOMP_MAP_VARS_OPENACC);
 460       tgt->prev = thr->mapped_data;
 461       thr->mapped_data = tgt;
 462
 463       goto out_prof;
 464     }
 465
 466   gomp_debug (0, "  %s: prepare mappings\n", __FUNCTION__);
 467   tgt = gomp_map_vars (acc_dev, mapnum, hostaddrs, NULL, sizes, kinds, true,
 468                        GOMP_MAP_VARS_OPENACC);
 469   gomp_debug (0, "  %s: mappings prepared\n", __FUNCTION__);
 470   tgt->prev = thr->mapped_data;
 471   thr->mapped_data = tgt;
 472
 473  out_prof:
 474   if (profiling_p)
 475     {
 476       prof_info.event_type = acc_ev_enter_data_end;
 477       enter_data_event_info.other_event.event_type = prof_info.event_type;
 478       goacc_profiling_dispatch (&prof_info, &enter_data_event_info, &api_info);
 479
 480       thr->prof_info = NULL;
 481       thr->api_info = NULL;
 482     }
 483 }
 484
 485 void
 486 GOACC_data_end (void)
 487 {
 488   struct goacc_thread *thr = goacc_thread ();
 489   struct gomp_device_descr *acc_dev = thr->dev;
 490   struct target_mem_desc *tgt = thr->mapped_data;
 491
 492   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 493
 494   acc_prof_info prof_info;
 495   if (profiling_p)
 496     {
 497       thr->prof_info = &prof_info;
 498
 499       prof_info.event_type = acc_ev_exit_data_start;
 500       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 501       prof_info.version = _ACC_PROF_INFO_VERSION;
 502       prof_info.device_type = acc_device_type (acc_dev->type);
 503       prof_info.device_number = acc_dev->target_id;
 504       prof_info.thread_id = -1;
 505       prof_info.async = acc_async_sync; /* Always synchronous.  */
 506       prof_info.async_queue = prof_info.async;
 507       prof_info.src_file = NULL;
 508       prof_info.func_name = NULL;
 509       prof_info.line_no = -1;
 510       prof_info.end_line_no = -1;
 511       prof_info.func_line_no = -1;
 512       prof_info.func_end_line_no = -1;
 513     }
 514   acc_event_info exit_data_event_info;
 515   if (profiling_p)
 516     {
 517       exit_data_event_info.other_event.event_type
 518         = prof_info.event_type;
 519       exit_data_event_info.other_event.valid_bytes
 520         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 521       exit_data_event_info.other_event.parent_construct = acc_construct_data;
 522       exit_data_event_info.other_event.implicit = 0;
 523       exit_data_event_info.other_event.tool_info = NULL;
 524     }
 525   acc_api_info api_info;
 526   if (profiling_p)
 527     {
 528       thr->api_info = &api_info;
 529
 530       api_info.device_api = acc_device_api_none;
 531       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 532       api_info.device_type = prof_info.device_type;
 533       api_info.vendor = -1;
 534       api_info.device_handle = NULL;
 535       api_info.context_handle = NULL;
 536       api_info.async_handle = NULL;
 537     }
 538
 539   if (profiling_p)
 540     goacc_profiling_dispatch (&prof_info, &exit_data_event_info, &api_info);
 541
 542   gomp_debug (0, "  %s: restore mappings\n", __FUNCTION__);
 543   thr->mapped_data = tgt->prev;
 544   gomp_unmap_vars (tgt, true);
 545   gomp_debug (0, "  %s: mappings restored\n", __FUNCTION__);
 546
 547   if (profiling_p)
 548     {
 549       prof_info.event_type = acc_ev_exit_data_end;
 550       exit_data_event_info.other_event.event_type = prof_info.event_type;
 551       goacc_profiling_dispatch (&prof_info, &exit_data_event_info, &api_info);
 552
 553       thr->prof_info = NULL;
 554       thr->api_info = NULL;
 555     }
 556 }
 557
 558 void
 559 GOACC_update (int flags_m, size_t mapnum,
 560               void **hostaddrs, size_t *sizes, unsigned short *kinds,
 561               int async, int num_waits, ...)
 562 {
 563   int flags = GOACC_FLAGS_UNMARSHAL (flags_m);
 564
 565   size_t i;
 566
 567   goacc_lazy_initialize ();
 568
 569   struct goacc_thread *thr = goacc_thread ();
 570   struct gomp_device_descr *acc_dev = thr->dev;
 571
 572   bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);
 573
 574   acc_prof_info prof_info;
 575   if (profiling_p)
 576     {
 577       thr->prof_info = &prof_info;
 578
 579       prof_info.event_type = acc_ev_update_start;
 580       prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
 581       prof_info.version = _ACC_PROF_INFO_VERSION;
 582       prof_info.device_type = acc_device_type (acc_dev->type);
 583       prof_info.device_number = acc_dev->target_id;
 584       prof_info.thread_id = -1;
 585       prof_info.async = async;
 586       prof_info.async_queue = prof_info.async;
 587       prof_info.src_file = NULL;
 588       prof_info.func_name = NULL;
 589       prof_info.line_no = -1;
 590       prof_info.end_line_no = -1;
 591       prof_info.func_line_no = -1;
 592       prof_info.func_end_line_no = -1;
 593     }
 594   acc_event_info update_event_info;
 595   if (profiling_p)
 596     {
 597       update_event_info.other_event.event_type
 598         = prof_info.event_type;
 599       update_event_info.other_event.valid_bytes
 600         = _ACC_OTHER_EVENT_INFO_VALID_BYTES;
 601       update_event_info.other_event.parent_construct = acc_construct_update;
 602       update_event_info.other_event.implicit = 0;
 603       update_event_info.other_event.tool_info = NULL;
 604     }
 605   acc_api_info api_info;
 606   if (profiling_p)
 607     {
 608       thr->api_info = &api_info;
 609
 610       api_info.device_api = acc_device_api_none;
 611       api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
 612       api_info.device_type = prof_info.device_type;
 613       api_info.vendor = -1;
 614       api_info.device_handle = NULL;
 615       api_info.context_handle = NULL;
 616       api_info.async_handle = NULL;
 617     }
 618
 619   if (profiling_p)
 620     goacc_profiling_dispatch (&prof_info, &update_event_info, &api_info);
 621
 622   if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
 623       || (flags & GOACC_FLAG_HOST_FALLBACK))
 624     {
 625       prof_info.device_type = acc_device_host;
 626       api_info.device_type = prof_info.device_type;
 627
 628       goto out_prof;
 629     }
 630
 631   if (num_waits)
 632     {
 633       va_list ap;
 634
 635       va_start (ap, num_waits);
 636       goacc_wait (async, num_waits, &ap);
 637       va_end (ap);
 638     }
 639
 640   bool update_device = false;
 641   for (i = 0; i < mapnum; ++i)
 642     {
 643       unsigned char kind = kinds[i] & 0xff;
 644
 645       switch (kind)
 646         {
 647         case GOMP_MAP_POINTER:
 648         case GOMP_MAP_TO_PSET:
 649           break;
 650
 651         case GOMP_MAP_ALWAYS_POINTER:
 652           if (update_device)
 653             {
 654               /* Save the contents of the host pointer.  */
 655               void *dptr = acc_deviceptr (hostaddrs[i-1]);
 656               uintptr_t t = *(uintptr_t *) hostaddrs[i];
 657
 658               /* Update the contents of the host pointer to reflect
 659                  the value of the allocated device memory in the
 660                  previous pointer.  */
 661               *(uintptr_t *) hostaddrs[i] = (uintptr_t)dptr;
 662               /* TODO: verify that we really cannot use acc_update_device_async
 663                  here.  */
 664               acc_update_device (hostaddrs[i], sizeof (uintptr_t));
 665
 666               /* Restore the host pointer.  */
 667               *(uintptr_t *) hostaddrs[i] = t;
 668               update_device = false;
 669             }
 670           break;
 671
 672         case GOMP_MAP_TO:
 673           if (!acc_is_present (hostaddrs[i], sizes[i]))
 674             {
 675               update_device = false;
 676               break;
 677             }
 678           /* Fallthru  */
 679         case GOMP_MAP_FORCE_TO:
 680           update_device = true;
 681           acc_update_device_async (hostaddrs[i], sizes[i], async);
 682           break;
 683
 684         case GOMP_MAP_FROM:
 685           if (!acc_is_present (hostaddrs[i], sizes[i]))
 686             {
 687               update_device = false;
 688               break;
 689             }
 690           /* Fallthru  */
 691         case GOMP_MAP_FORCE_FROM:
 692           update_device = false;
 693           acc_update_self_async (hostaddrs[i], sizes[i], async);
 694           break;
 695
 696         default:
 697           gomp_fatal (">>>> GOACC_update UNHANDLED kind 0x%.2x", kind);
 698           break;
 699         }
 700     }
 701
 702  out_prof:
 703   if (profiling_p)
 704     {
 705       prof_info.event_type = acc_ev_update_end;
 706       update_event_info.other_event.event_type = prof_info.event_type;
 707       goacc_profiling_dispatch (&prof_info, &update_event_info, &api_info);
 708
 709       thr->prof_info = NULL;
 710       thr->api_info = NULL;
 711     }
 712 }
 713
 714
 715 /* Legacy entry point (GCC 5).  */
 716
 717 int
 718 GOACC_get_num_threads (void)
 719 {
 720   return 1;
 721 }
 722
 723 /* Legacy entry point (GCC 5).  */
 724
 725 int
 726 GOACC_get_thread_num (void)
 727 {
 728   return 0;
 729 }
 730
 731 void
 732 GOACC_declare (int flags_m, size_t mapnum,
 733                void **hostaddrs, size_t *sizes, unsigned short *kinds)
 734 {
 735   int i;
 736
 737   for (i = 0; i < mapnum; i++)
 738     {
 739       unsigned char kind = kinds[i] & 0xff;
 740
 741       if (kind == GOMP_MAP_POINTER || kind == GOMP_MAP_TO_PSET)
 742         continue;
 743
 744       switch (kind)
 745         {
 746           case GOMP_MAP_FORCE_ALLOC:
 747           case GOMP_MAP_FORCE_FROM:
 748           case GOMP_MAP_FORCE_TO:
 749           case GOMP_MAP_POINTER:
 750           case GOMP_MAP_RELEASE:
 751           case GOMP_MAP_DELETE:
 752             GOACC_enter_exit_data (flags_m, 1, &hostaddrs[i], &sizes[i],
 753                                    &kinds[i], GOMP_ASYNC_SYNC, 0);
 754             break;
 755
 756           case GOMP_MAP_FORCE_DEVICEPTR:
 757             break;
 758
 759           case GOMP_MAP_ALLOC:
 760             if (!acc_is_present (hostaddrs[i], sizes[i]))
 761               GOACC_enter_exit_data (flags_m, 1, &hostaddrs[i], &sizes[i],
 762                                      &kinds[i], GOMP_ASYNC_SYNC, 0);
 763             break;
 764
 765           case GOMP_MAP_TO:
 766             GOACC_enter_exit_data (flags_m, 1, &hostaddrs[i], &sizes[i],
 767                                    &kinds[i], GOMP_ASYNC_SYNC, 0);
 768
 769             break;
 770
 771           case GOMP_MAP_FROM:
 772             GOACC_enter_exit_data (flags_m, 1, &hostaddrs[i], &sizes[i],
 773                                    &kinds[i], GOMP_ASYNC_SYNC, 0);
 774             break;
 775
 776           case GOMP_MAP_FORCE_PRESENT:
 777             if (!acc_is_present (hostaddrs[i], sizes[i]))
 778               gomp_fatal ("[%p,%ld] is not mapped", hostaddrs[i],
 779                           (unsigned long) sizes[i]);
 780             break;
 781
 782           default:
 783             assert (0);
 784             break;
 785         }
 786     }
 787 }