PrimOps.cmm 62.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
/* -----------------------------------------------------------------------------
 *
 * (c) The GHC Team, 1998-2004
 *
 * Out-of-line primitive operations
 *
 * This file contains the implementations of all the primitive
 * operations ("primops") which are not expanded inline.  See
 * ghc/compiler/prelude/primops.txt.pp for a list of all the primops;
 * this file contains code for most of those with the attribute
 * out_of_line=True.
 *
 * Entry convention: the entry convention for a primop is that all the
 * args are in Stg registers (R1, R2, etc.).  This is to make writing
 * the primops easier.  (see compiler/codeGen/CgCallConv.hs).
 *
 * Return convention: results from a primop are generally returned
 * using the ordinary unboxed tuple return convention.  The C-- parser
 * implements the RET_xxxx() macros to perform unboxed-tuple returns
 * based on the prevailing return convention.
 *
 * This file is written in a subset of C--, extended with various
 * features specific to GHC.  It is compiled by GHC directly.  For the
 * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
 *
 * ---------------------------------------------------------------------------*/

#include "Cmm.h"

/*-----------------------------------------------------------------------------
  Array Primitives

  Basically just new*Array - the others are all inline macros.

  The size arg is always passed in R1, and the result returned in R1.

  The slow entry point is for returning from a heap check, the saved
  size argument must be re-loaded from the stack.
  -------------------------------------------------------------------------- */

/* for objects that are *less* than the size of a word, make sure we
 * round up to the nearest word for the size of the array.
 */

newByteArrayzh_fast
{
    W_ words, payload_words, n, p;
    MAYBE_GC(NO_PTRS,newByteArrayzh_fast);
    n = R1;
    payload_words = ROUNDUP_BYTES_TO_WDS(n);
    words = BYTES_TO_WDS(SIZEOF_StgArrWords) + payload_words;
52
    "ptr" p = foreign "C" allocateLocal(MyCapability() "ptr",words) [];
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
    TICK_ALLOC_PRIM(SIZEOF_StgArrWords,WDS(payload_words),0);
    SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
    StgArrWords_words(p) = payload_words;
    RET_P(p);
}

newPinnedByteArrayzh_fast
{
    W_ words, payload_words, n, p;

    MAYBE_GC(NO_PTRS,newPinnedByteArrayzh_fast);
    n = R1;
    payload_words = ROUNDUP_BYTES_TO_WDS(n);

    // We want an 8-byte aligned array.  allocatePinned() gives us
    // 8-byte aligned memory by default, but we want to align the
    // *goods* inside the ArrWords object, so we have to check the
    // size of the ArrWords header and adjust our size accordingly.
    words = BYTES_TO_WDS(SIZEOF_StgArrWords) + payload_words;
    if ((SIZEOF_StgArrWords & 7) != 0) {
	words = words + 1;
    }

76
    "ptr" p = foreign "C" allocatePinned(words) [];
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
    TICK_ALLOC_PRIM(SIZEOF_StgArrWords,WDS(payload_words),0);

    // Again, if the ArrWords header isn't a multiple of 8 bytes, we
    // have to push the object forward one word so that the goods
    // fall on an 8-byte boundary.
    if ((SIZEOF_StgArrWords & 7) != 0) {
	p = p + WDS(1);
    }

    SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
    StgArrWords_words(p) = payload_words;
    RET_P(p);
}

newArrayzh_fast
{
    W_ words, n, init, arr, p;
    /* Args: R1 = words, R2 = initialisation value */

    n = R1;
    MAYBE_GC(R2_PTR,newArrayzh_fast);

    words = BYTES_TO_WDS(SIZEOF_StgMutArrPtrs) + n;
100
    "ptr" arr = foreign "C" allocateLocal(MyCapability() "ptr",words) [R2];
101 102
    TICK_ALLOC_PRIM(SIZEOF_StgMutArrPtrs, WDS(n), 0);

103
    SET_HDR(arr, stg_MUT_ARR_PTRS_DIRTY_info, W_[CCCS]);
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
    StgMutArrPtrs_ptrs(arr) = n;

    // Initialise all elements of the the array with the value in R2
    init = R2;
    p = arr + SIZEOF_StgMutArrPtrs;
  for:
    if (p < arr + WDS(words)) {
	W_[p] = init;
	p = p + WDS(1);
	goto for;
    }

    RET_P(arr);
}

unsafeThawArrayzh_fast
{
  // SUBTLETY TO DO WITH THE OLD GEN MUTABLE LIST
  //
  // A MUT_ARR_PTRS lives on the mutable list, but a MUT_ARR_PTRS_FROZEN 
  // normally doesn't.  However, when we freeze a MUT_ARR_PTRS, we leave
  // it on the mutable list for the GC to remove (removing something from
  // the mutable list is not easy, because the mut_list is only singly-linked).
  // 
128
  // So that we can tell whether a MUT_ARR_PTRS_FROZEN is on the mutable list,
129 130 131
  // when we freeze it we set the info ptr to be MUT_ARR_PTRS_FROZEN0
  // to indicate that it is still on the mutable list.
  //
132 133
  // So, when we thaw a MUT_ARR_PTRS_FROZEN, we must cope with two cases:
  // either it is on a mut_list, or it isn't.  We adopt the convention that
134
  // the closure type is MUT_ARR_PTRS_FROZEN0 if it is on the mutable list,
135 136 137
  // and MUT_ARR_PTRS_FROZEN otherwise.  In fact it wouldn't matter if
  // we put it on the mutable list more than once, but it would get scavenged
  // multiple times during GC, which would be unnecessarily slow.
138
  //
139
  if (StgHeader_info(R1) != stg_MUT_ARR_PTRS_FROZEN0_info) {
140
	SET_INFO(R1,stg_MUT_ARR_PTRS_DIRTY_info);
141
	recordMutable(R1, R1);
142 143 144
	// must be done after SET_INFO, because it ASSERTs closure_MUTABLE()
	RET_P(R1);
  } else {
145
	SET_INFO(R1,stg_MUT_ARR_PTRS_DIRTY_info);
146
	RET_P(R1);
147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
  }
}

/* -----------------------------------------------------------------------------
   MutVar primitives
   -------------------------------------------------------------------------- */

newMutVarzh_fast
{
    W_ mv;
    /* Args: R1 = initialisation value */

    ALLOC_PRIM( SIZEOF_StgMutVar, R1_PTR, newMutVarzh_fast);

    mv = Hp - SIZEOF_StgMutVar + WDS(1);
162
    SET_HDR(mv,stg_MUT_VAR_DIRTY_info,W_[CCCS]);
163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
    StgMutVar_var(mv) = R1;
    
    RET_P(mv);
}

atomicModifyMutVarzh_fast
{
    W_ mv, z, x, y, r;
    /* Args: R1 :: MutVar#,  R2 :: a -> (a,b) */

    /* If x is the current contents of the MutVar#, then 
       We want to make the new contents point to

         (sel_0 (f x))
 
       and the return value is
	 
	 (sel_1 (f x))

        obviously we can share (f x).

         z = [stg_ap_2 f x]  (max (HS + 2) MIN_UPD_SIZE)
	 y = [stg_sel_0 z]   (max (HS + 1) MIN_UPD_SIZE)
         r = [stg_sel_1 z]   (max (HS + 1) MIN_UPD_SIZE)
    */

#if MIN_UPD_SIZE > 1
190
#define THUNK_1_SIZE (SIZEOF_StgThunkHeader + WDS(MIN_UPD_SIZE))
191 192
#define TICK_ALLOC_THUNK_1() TICK_ALLOC_UP_THK(WDS(1),WDS(MIN_UPD_SIZE-1))
#else
193
#define THUNK_1_SIZE (SIZEOF_StgThunkHeader + WDS(1))
194 195 196 197
#define TICK_ALLOC_THUNK_1() TICK_ALLOC_UP_THK(WDS(1),0)
#endif

#if MIN_UPD_SIZE > 2
198
#define THUNK_2_SIZE (SIZEOF_StgThunkHeader + WDS(MIN_UPD_SIZE))
199 200
#define TICK_ALLOC_THUNK_2() TICK_ALLOC_UP_THK(WDS(2),WDS(MIN_UPD_SIZE-2))
#else
201
#define THUNK_2_SIZE (SIZEOF_StgThunkHeader + WDS(2))
202 203 204 205 206 207 208
#define TICK_ALLOC_THUNK_2() TICK_ALLOC_UP_THK(WDS(2),0)
#endif

#define SIZE (THUNK_2_SIZE + THUNK_1_SIZE + THUNK_1_SIZE)

   HP_CHK_GEN_TICKY(SIZE, R1_PTR & R2_PTR, atomicModifyMutVarzh_fast);

209
#if defined(THREADED_RTS)
210
    foreign "C" ACQUIRE_LOCK(atomic_modify_mutvar_mutex "ptr") [R1,R2];
211 212
#endif

213 214 215 216 217 218 219
   x = StgMutVar_var(R1);

   TICK_ALLOC_THUNK_2();
   CCCS_ALLOC(THUNK_2_SIZE);
   z = Hp - THUNK_2_SIZE + WDS(1);
   SET_HDR(z, stg_ap_2_upd_info, W_[CCCS]);
   LDV_RECORD_CREATE(z);
220 221
   StgThunk_payload(z,0) = R2;
   StgThunk_payload(z,1) = x;
222 223 224 225 226 227

   TICK_ALLOC_THUNK_1();
   CCCS_ALLOC(THUNK_1_SIZE);
   y = z - THUNK_1_SIZE;
   SET_HDR(y, stg_sel_0_upd_info, W_[CCCS]);
   LDV_RECORD_CREATE(y);
228
   StgThunk_payload(y,0) = z;
229 230

   StgMutVar_var(R1) = y;
231
   foreign "C" dirty_MUT_VAR(BaseReg "ptr", R1 "ptr") [R1];
232 233 234 235 236 237

   TICK_ALLOC_THUNK_1();
   CCCS_ALLOC(THUNK_1_SIZE);
   r = y - THUNK_1_SIZE;
   SET_HDR(r, stg_sel_1_upd_info, W_[CCCS]);
   LDV_RECORD_CREATE(r);
238 239
   StgThunk_payload(r,0) = z;

240
#if defined(THREADED_RTS)
241
    foreign "C" RELEASE_LOCK(atomic_modify_mutvar_mutex "ptr") [];
242
#endif
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276

   RET_P(r);
}

/* -----------------------------------------------------------------------------
   Weak Pointer Primitives
   -------------------------------------------------------------------------- */

STRING(stg_weak_msg,"New weak pointer at %p\n")

mkWeakzh_fast
{
  /* R1 = key
     R2 = value
     R3 = finalizer (or NULL)
  */
  W_ w;

  if (R3 == NULL) {
    R3 = stg_NO_FINALIZER_closure;
  }

  ALLOC_PRIM( SIZEOF_StgWeak, R1_PTR & R2_PTR & R3_PTR, mkWeakzh_fast );

  w = Hp - SIZEOF_StgWeak + WDS(1);
  SET_HDR(w, stg_WEAK_info, W_[CCCS]);

  StgWeak_key(w)       = R1;
  StgWeak_value(w)     = R2;
  StgWeak_finalizer(w) = R3;

  StgWeak_link(w)	= W_[weak_ptr_list];
  W_[weak_ptr_list] 	= w;

277
  IF_DEBUG(weak, foreign "C" debugBelch(stg_weak_msg,w) []);
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315

  RET_P(w);
}


finalizzeWeakzh_fast
{
  /* R1 = weak ptr
   */
  W_ w, f;

  w = R1;

  // already dead?
  if (GET_INFO(w) == stg_DEAD_WEAK_info) {
      RET_NP(0,stg_NO_FINALIZER_closure);
  }

  // kill it
#ifdef PROFILING
  // @LDV profiling
  // A weak pointer is inherently used, so we do not need to call
  // LDV_recordDead_FILL_SLOP_DYNAMIC():
  //    LDV_recordDead_FILL_SLOP_DYNAMIC((StgClosure *)w);
  // or, LDV_recordDead():
  //    LDV_recordDead((StgClosure *)w, sizeofW(StgWeak) - sizeofW(StgProfHeader));
  // Furthermore, when PROFILING is turned on, dead weak pointers are exactly as 
  // large as weak pointers, so there is no need to fill the slop, either.
  // See stg_DEAD_WEAK_info in StgMiscClosures.hc.
#endif

  //
  // Todo: maybe use SET_HDR() and remove LDV_recordCreate()?
  //
  SET_INFO(w,stg_DEAD_WEAK_info);
  LDV_RECORD_CREATE(w);

  f = StgWeak_finalizer(w);
316
  StgDeadWeak_link(w) = StgWeak_link(w);
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514

  /* return the finalizer */
  if (f == stg_NO_FINALIZER_closure) {
      RET_NP(0,stg_NO_FINALIZER_closure);
  } else {
      RET_NP(1,f);
  }
}

deRefWeakzh_fast
{
  /* R1 = weak ptr */
  W_ w, code, val;

  w = R1;
  if (GET_INFO(w) == stg_WEAK_info) {
    code = 1;
    val = StgWeak_value(w);
  } else {
    code = 0;
    val = w;
  }
  RET_NP(code,val);
}

/* -----------------------------------------------------------------------------
   Arbitrary-precision Integer operations.

   There are some assumptions in this code that mp_limb_t == W_.  This is
   the case for all the platforms that GHC supports, currently.
   -------------------------------------------------------------------------- */

int2Integerzh_fast
{
   /* arguments: R1 = Int# */

   W_ val, s, p;	/* to avoid aliasing */

   val = R1;
   ALLOC_PRIM( SIZEOF_StgArrWords + WDS(1), NO_PTRS, int2Integerzh_fast );

   p = Hp - SIZEOF_StgArrWords;
   SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
   StgArrWords_words(p) = 1;

   /* mpz_set_si is inlined here, makes things simpler */
   if (%lt(val,0)) { 
	s  = -1;
	Hp(0) = -val;
   } else { 
     if (%gt(val,0)) {
	s = 1;
	Hp(0) = val;
     } else {
	s = 0;
     }
  }

   /* returns (# size  :: Int#, 
		 data  :: ByteArray# 
	       #)
   */
   RET_NP(s,p);
}

word2Integerzh_fast
{
   /* arguments: R1 = Word# */

   W_ val, s, p;	/* to avoid aliasing */

   val = R1;

   ALLOC_PRIM( SIZEOF_StgArrWords + WDS(1), NO_PTRS, word2Integerzh_fast);

   p = Hp - SIZEOF_StgArrWords;
   SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
   StgArrWords_words(p) = 1;

   if (val != 0) {
	s = 1;
	W_[Hp] = val;
   } else {
	s = 0;
   }

   /* returns (# size  :: Int#, 
		 data  :: ByteArray# #)
   */
   RET_NP(s,p);
}


/*
 * 'long long' primops for converting to/from Integers.
 */

#ifdef SUPPORT_LONG_LONGS

int64ToIntegerzh_fast
{
   /* arguments: L1 = Int64# */

   L_ val;
   W_ hi, s, neg, words_needed, p;

   val = L1;
   neg = 0;

   if ( %ge(val,0x100000000::L_) || %le(val,-0x100000000::L_) )  { 
       words_needed = 2;
   } else { 
       // minimum is one word
       words_needed = 1;
   }

   ALLOC_PRIM( SIZEOF_StgArrWords + WDS(words_needed),
	       NO_PTRS, int64ToIntegerzh_fast );

   p = Hp - SIZEOF_StgArrWords - WDS(words_needed) + WDS(1);
   SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
   StgArrWords_words(p) = words_needed;

   if ( %lt(val,0::L_) ) {
     neg = 1;
     val = -val;
   }

   hi = TO_W_(val >> 32);

   if ( words_needed == 2 )  { 
      s = 2;
      Hp(-1) = TO_W_(val);
      Hp(0) = hi;
   } else { 
       if ( val != 0::L_ ) {
	   s = 1;
	   Hp(0) = TO_W_(val);
       } else /* val==0 */  {
	   s = 0;
       }
   }
   if ( neg != 0 ) {
	s = -s;
   }

   /* returns (# size  :: Int#, 
		 data  :: ByteArray# #)
   */
   RET_NP(s,p);
}

word64ToIntegerzh_fast
{
   /* arguments: L1 = Word64# */

   L_ val;
   W_ hi, s, words_needed, p;

   val = L1;
   if ( val >= 0x100000000::L_ ) {
      words_needed = 2;
   } else {
      words_needed = 1;
   }

   ALLOC_PRIM( SIZEOF_StgArrWords + WDS(words_needed),
	       NO_PTRS, word64ToIntegerzh_fast );

   p = Hp - SIZEOF_StgArrWords - WDS(words_needed) + WDS(1);
   SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
   StgArrWords_words(p) = words_needed;

   hi = TO_W_(val >> 32);
   if ( val >= 0x100000000::L_ ) { 
     s = 2;
     Hp(-1) = TO_W_(val);
     Hp(0)  = hi;
   } else {
      if ( val != 0::L_ ) {
        s = 1;
        Hp(0) = TO_W_(val);
     } else /* val==0 */  {
      s = 0;
     }
  }

   /* returns (# size  :: Int#, 
		 data  :: ByteArray# #)
   */
   RET_NP(s,p);
}


#endif /* SUPPORT_LONG_LONGS */

/* ToDo: this is shockingly inefficient */

515
#ifndef THREADED_RTS
516 517 518 519 520 521 522 523 524 525 526
section "bss" {
  mp_tmp1:
    bits8 [SIZEOF_MP_INT];
}

section "bss" {
  mp_tmp2:
    bits8 [SIZEOF_MP_INT];
}

section "bss" {
527
  mp_result1:
528 529 530 531
    bits8 [SIZEOF_MP_INT];
}

section "bss" {
532
  mp_result2:
533 534
    bits8 [SIZEOF_MP_INT];
}
535 536
#endif

537
#ifdef THREADED_RTS
538 539 540 541 542 543
#define FETCH_MP_TEMP(X) \
W_ X; \
X = BaseReg + (OFFSET_StgRegTable_r ## X);
#else
#define FETCH_MP_TEMP(X) /* Nothing */
#endif
544

545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569
#define GMP_TAKE2_RET1(name,mp_fun)                                     \
name                                                                    \
{                                                                       \
  CInt s1, s2;                                                          \
  W_ d1, d2;                                                            \
  FETCH_MP_TEMP(mp_tmp1);                                               \
  FETCH_MP_TEMP(mp_tmp2);                                               \
  FETCH_MP_TEMP(mp_result1)                                             \
  FETCH_MP_TEMP(mp_result2);                                            \
                                                                        \
  /* call doYouWantToGC() */                                            \
  MAYBE_GC(R2_PTR & R4_PTR, name);                                      \
                                                                        \
  s1 = W_TO_INT(R1);                                                    \
  d1 = R2;                                                              \
  s2 = W_TO_INT(R3);                                                    \
  d2 = R4;                                                              \
                                                                        \
  MP_INT__mp_alloc(mp_tmp1) = W_TO_INT(StgArrWords_words(d1));          \
  MP_INT__mp_size(mp_tmp1)  = (s1);                                     \
  MP_INT__mp_d(mp_tmp1)	    = BYTE_ARR_CTS(d1);                         \
  MP_INT__mp_alloc(mp_tmp2) = W_TO_INT(StgArrWords_words(d2));          \
  MP_INT__mp_size(mp_tmp2)  = (s2);                                     \
  MP_INT__mp_d(mp_tmp2)	    = BYTE_ARR_CTS(d2);                         \
                                                                        \
570
  foreign "C" __gmpz_init(mp_result1 "ptr") [];                            \
571 572
                                                                        \
  /* Perform the operation */                                           \
573
  foreign "C" mp_fun(mp_result1 "ptr",mp_tmp1  "ptr",mp_tmp2  "ptr") []; \
574 575 576
                                                                        \
  RET_NP(TO_W_(MP_INT__mp_size(mp_result1)),                            \
         MP_INT__mp_d(mp_result1) - SIZEOF_StgArrWords);                \
577 578
}

579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596
#define GMP_TAKE1_RET1(name,mp_fun)                                     \
name                                                                    \
{                                                                       \
  CInt s1;                                                              \
  W_ d1;                                                                \
  FETCH_MP_TEMP(mp_tmp1);                                               \
  FETCH_MP_TEMP(mp_result1)                                             \
                                                                        \
  /* call doYouWantToGC() */                                            \
  MAYBE_GC(R2_PTR, name);                                               \
                                                                        \
  d1 = R2;                                                              \
  s1 = W_TO_INT(R1);                                                    \
                                                                        \
  MP_INT__mp_alloc(mp_tmp1)	= W_TO_INT(StgArrWords_words(d1));      \
  MP_INT__mp_size(mp_tmp1)	= (s1);                                 \
  MP_INT__mp_d(mp_tmp1)		= BYTE_ARR_CTS(d1);                     \
                                                                        \
597
  foreign "C" __gmpz_init(mp_result1 "ptr") [];                            \
598 599
                                                                        \
  /* Perform the operation */                                           \
600
  foreign "C" mp_fun(mp_result1 "ptr",mp_tmp1 "ptr") [];                \
601 602 603
                                                                        \
  RET_NP(TO_W_(MP_INT__mp_size(mp_result1)),                            \
         MP_INT__mp_d(mp_result1) - SIZEOF_StgArrWords);                \
604 605
}

606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
#define GMP_TAKE2_RET2(name,mp_fun)                                                     \
name                                                                                    \
{                                                                                       \
  CInt s1, s2;                                                                          \
  W_ d1, d2;                                                                            \
  FETCH_MP_TEMP(mp_tmp1);                                                               \
  FETCH_MP_TEMP(mp_tmp2);                                                               \
  FETCH_MP_TEMP(mp_result1)                                                             \
  FETCH_MP_TEMP(mp_result2)                                                             \
                                                                                        \
  /* call doYouWantToGC() */                                                            \
  MAYBE_GC(R2_PTR & R4_PTR, name);                                                      \
                                                                                        \
  s1 = W_TO_INT(R1);                                                                    \
  d1 = R2;                                                                              \
  s2 = W_TO_INT(R3);                                                                    \
  d2 = R4;                                                                              \
                                                                                        \
  MP_INT__mp_alloc(mp_tmp1)	= W_TO_INT(StgArrWords_words(d1));                      \
  MP_INT__mp_size(mp_tmp1)	= (s1);                                                 \
  MP_INT__mp_d(mp_tmp1)		= BYTE_ARR_CTS(d1);                                     \
  MP_INT__mp_alloc(mp_tmp2)	= W_TO_INT(StgArrWords_words(d2));                      \
  MP_INT__mp_size(mp_tmp2)	= (s2);                                                 \
  MP_INT__mp_d(mp_tmp2)		= BYTE_ARR_CTS(d2);                                     \
                                                                                        \
631 632
  foreign "C" __gmpz_init(mp_result1 "ptr") [];                                               \
  foreign "C" __gmpz_init(mp_result2 "ptr") [];                                               \
633 634
                                                                                        \
  /* Perform the operation */                                                           \
635
  foreign "C" mp_fun(mp_result1 "ptr",mp_result2 "ptr",mp_tmp1 "ptr",mp_tmp2 "ptr") [];    \
636 637 638 639 640
                                                                                        \
  RET_NPNP(TO_W_(MP_INT__mp_size(mp_result1)),                                          \
           MP_INT__mp_d(mp_result1) - SIZEOF_StgArrWords,                               \
	   TO_W_(MP_INT__mp_size(mp_result2)),                                          \
           MP_INT__mp_d(mp_result2) - SIZEOF_StgArrWords);                              \
641 642
}

643 644 645 646 647 648 649 650 651 652 653 654 655 656
GMP_TAKE2_RET1(plusIntegerzh_fast,     __gmpz_add)
GMP_TAKE2_RET1(minusIntegerzh_fast,    __gmpz_sub)
GMP_TAKE2_RET1(timesIntegerzh_fast,    __gmpz_mul)
GMP_TAKE2_RET1(gcdIntegerzh_fast,      __gmpz_gcd)
GMP_TAKE2_RET1(quotIntegerzh_fast,     __gmpz_tdiv_q)
GMP_TAKE2_RET1(remIntegerzh_fast,      __gmpz_tdiv_r)
GMP_TAKE2_RET1(divExactIntegerzh_fast, __gmpz_divexact)
GMP_TAKE2_RET1(andIntegerzh_fast,      __gmpz_and)
GMP_TAKE2_RET1(orIntegerzh_fast,       __gmpz_ior)
GMP_TAKE2_RET1(xorIntegerzh_fast,      __gmpz_xor)
GMP_TAKE1_RET1(complementIntegerzh_fast, __gmpz_com)

GMP_TAKE2_RET2(quotRemIntegerzh_fast, __gmpz_tdiv_qr)
GMP_TAKE2_RET2(divModIntegerzh_fast,  __gmpz_fdiv_qr)
657

658
#ifndef THREADED_RTS
659
section "bss" {
660
  mp_tmp_w:  W_; // NB. mp_tmp_w is really an here mp_limb_t
661
}
662
#endif
663 664 665 666 667

gcdIntzh_fast
{
    /* R1 = the first Int#; R2 = the second Int# */
    W_ r; 
668
    FETCH_MP_TEMP(mp_tmp_w);
669

670
    W_[mp_tmp_w] = R1;
671
    r = foreign "C" __gmpn_gcd_1(mp_tmp_w "ptr", 1, R2) [];
672 673 674 675 676 677 678 679 680 681

    R1 = r;
    /* Result parked in R1, return via info-pointer at TOS */
    jump %ENTRY_CODE(Sp(0));
}


gcdIntegerIntzh_fast
{
    /* R1 = s1; R2 = d1; R3 = the int */
682
    R1 = foreign "C" __gmpn_gcd_1( BYTE_ARR_CTS(R2) "ptr", R1, R3) [];
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
    
    /* Result parked in R1, return via info-pointer at TOS */
    jump %ENTRY_CODE(Sp(0));
}


cmpIntegerIntzh_fast
{
    /* R1 = s1; R2 = d1; R3 = the int */
    W_ usize, vsize, v_digit, u_digit;

    usize = R1;
    vsize = 0;
    v_digit = R3;

698
    // paraphrased from __gmpz_cmp_si() in the GMP sources
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
    if (%gt(v_digit,0)) {
	vsize = 1;
    } else { 
	if (%lt(v_digit,0)) {
	    vsize = -1;
	    v_digit = -v_digit;
	}
    }

    if (usize != vsize) {
	R1 = usize - vsize; 
	jump %ENTRY_CODE(Sp(0));
    }

    if (usize == 0) {
	R1 = 0; 
	jump %ENTRY_CODE(Sp(0));
    }

    u_digit = W_[BYTE_ARR_CTS(R2)];

    if (u_digit == v_digit) {
	R1 = 0; 
	jump %ENTRY_CODE(Sp(0));
    }

    if (%gtu(u_digit,v_digit)) { // NB. unsigned: these are mp_limb_t's
	R1 = usize; 
    } else {
	R1 = -usize; 
    }

    jump %ENTRY_CODE(Sp(0));
}

cmpIntegerzh_fast
{
    /* R1 = s1; R2 = d1; R3 = s2; R4 = d2 */
    W_ usize, vsize, size, up, vp;
    CInt cmp;

740
    // paraphrased from __gmpz_cmp() in the GMP sources
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
    usize = R1;
    vsize = R3;

    if (usize != vsize) {
	R1 = usize - vsize; 
	jump %ENTRY_CODE(Sp(0));
    }

    if (usize == 0) {
	R1 = 0; 
	jump %ENTRY_CODE(Sp(0));
    }

    if (%lt(usize,0)) { // NB. not <, which is unsigned
	size = -usize;
    } else {
	size = usize;
    }

    up = BYTE_ARR_CTS(R2);
    vp = BYTE_ARR_CTS(R4);

763
    cmp = foreign "C" __gmpn_cmp(up "ptr", vp "ptr", size) [];
764

765
    if (cmp == 0 :: CInt) {
766 767 768 769
	R1 = 0; 
	jump %ENTRY_CODE(Sp(0));
    }

770
    if (%lt(cmp,0 :: CInt) == %lt(usize,0)) {
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
	R1 = 1;
    } else {
	R1 = (-1); 
    }
    /* Result parked in R1, return via info-pointer at TOS */
    jump %ENTRY_CODE(Sp(0));
}

integer2Intzh_fast
{
    /* R1 = s; R2 = d */
    W_ r, s;

    s = R1;
    if (s == 0) {
	r = 0;
    } else {
	r = W_[R2 + SIZEOF_StgArrWords];
	if (%lt(s,0)) {
	    r = -r;
	}
    }
    /* Result parked in R1, return via info-pointer at TOS */
    R1 = r;
    jump %ENTRY_CODE(Sp(0));
}

integer2Wordzh_fast
{
  /* R1 = s; R2 = d */
  W_ r, s;

  s = R1;
  if (s == 0) {
    r = 0;
  } else {
    r = W_[R2 + SIZEOF_StgArrWords];
    if (%lt(s,0)) {
	r = -r;
    }
  }
  /* Result parked in R1, return via info-pointer at TOS */
  R1 = r;
  jump %ENTRY_CODE(Sp(0));
}

decodeFloatzh_fast
{ 
    W_ p;
    F_ arg;
821 822
    FETCH_MP_TEMP(mp_tmp1);
    FETCH_MP_TEMP(mp_tmp_w);
823 824 825 826 827 828 829 830 831 832 833 834 835 836
    
    /* arguments: F1 = Float# */
    arg = F1;
    
    ALLOC_PRIM( SIZEOF_StgArrWords + WDS(1), NO_PTRS, decodeFloatzh_fast );
    
    /* Be prepared to tell Lennart-coded __decodeFloat
       where mantissa._mp_d can be put (it does not care about the rest) */
    p = Hp - SIZEOF_StgArrWords;
    SET_HDR(p,stg_ARR_WORDS_info,W_[CCCS]);
    StgArrWords_words(p) = 1;
    MP_INT__mp_d(mp_tmp1) = BYTE_ARR_CTS(p);
    
    /* Perform the operation */
837
    foreign "C" __decodeFloat(mp_tmp1 "ptr",mp_tmp_w "ptr" ,arg) [];
838 839
    
    /* returns: (Int# (expn), Int#, ByteArray#) */
840
    RET_NNP(W_[mp_tmp_w], TO_W_(MP_INT__mp_size(mp_tmp1)), p);
841 842 843 844 845 846 847 848 849
}

#define DOUBLE_MANTISSA_SIZE SIZEOF_DOUBLE
#define ARR_SIZE (SIZEOF_StgArrWords + DOUBLE_MANTISSA_SIZE)

decodeDoublezh_fast
{ 
    D_ arg;
    W_ p;
850 851
    FETCH_MP_TEMP(mp_tmp1);
    FETCH_MP_TEMP(mp_tmp_w);
852 853 854 855 856 857 858 859 860 861 862 863 864 865

    /* arguments: D1 = Double# */
    arg = D1;

    ALLOC_PRIM( ARR_SIZE, NO_PTRS, decodeDoublezh_fast );
    
    /* Be prepared to tell Lennart-coded __decodeDouble
       where mantissa.d can be put (it does not care about the rest) */
    p = Hp - ARR_SIZE + WDS(1);
    SET_HDR(p, stg_ARR_WORDS_info, W_[CCCS]);
    StgArrWords_words(p) = BYTES_TO_WDS(DOUBLE_MANTISSA_SIZE);
    MP_INT__mp_d(mp_tmp1) = BYTE_ARR_CTS(p);

    /* Perform the operation */
866
    foreign "C" __decodeDouble(mp_tmp1 "ptr", mp_tmp_w "ptr",arg) [];
867 868
    
    /* returns: (Int# (expn), Int#, ByteArray#) */
869
    RET_NNP(W_[mp_tmp_w], TO_W_(MP_INT__mp_size(mp_tmp1)), p);
870 871 872 873 874 875 876 877 878
}

/* -----------------------------------------------------------------------------
 * Concurrency primitives
 * -------------------------------------------------------------------------- */

forkzh_fast
{
  /* args: R1 = closure to spark */
879

880 881
  MAYBE_GC(R1_PTR, forkzh_fast);

882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
  W_ closure;
  W_ threadid;
  closure = R1;

  "ptr" threadid = foreign "C" createIOThread( MyCapability() "ptr", 
				RtsFlags_GcFlags_initialStkSize(RtsFlags), 
				closure "ptr") [];
  foreign "C" scheduleThread(MyCapability() "ptr", threadid "ptr") [];

  // switch at the earliest opportunity
  CInt[context_switch] = 1 :: CInt;
  
  RET_P(threadid);
}

forkOnzh_fast
{
  /* args: R1 = cpu, R2 = closure to spark */

  MAYBE_GC(R2_PTR, forkOnzh_fast);

  W_ cpu;
  W_ closure;
  W_ threadid;
  cpu = R1;
  closure = R2;

  "ptr" threadid = foreign "C" createIOThread( MyCapability() "ptr", 
910
				RtsFlags_GcFlags_initialStkSize(RtsFlags), 
911 912
				closure "ptr") [];
  foreign "C" scheduleThreadOn(MyCapability() "ptr", cpu, threadid "ptr") [];
913 914

  // switch at the earliest opportunity
915
  CInt[context_switch] = 1 :: CInt;
916
  
917
  RET_P(threadid);
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
}

yieldzh_fast
{
  jump stg_yield_noregs;
}

myThreadIdzh_fast
{
  /* no args. */
  RET_P(CurrentTSO);
}

labelThreadzh_fast
{
  /* args: 
	R1 = ThreadId#
	R2 = Addr# */
#ifdef DEBUG
937
  foreign "C" labelThread(R1 "ptr", R2 "ptr") [];
938 939 940 941 942 943 944 945
#endif
  jump %ENTRY_CODE(Sp(0));
}

isCurrentThreadBoundzh_fast
{
  /* no args */
  W_ r;
946
  r = foreign "C" isThreadBound(CurrentTSO) [];
947 948 949
  RET_N(r);
}

950 951 952 953 954 955 956 957 958 959 960 961 962 963 964

/* -----------------------------------------------------------------------------
 * TVar primitives
 * -------------------------------------------------------------------------- */

#ifdef REG_R1
#define SP_OFF 0
#define IF_NOT_REG_R1(x) 
#else
#define SP_OFF 1
#define IF_NOT_REG_R1(x) x
#endif

// Catch retry frame ------------------------------------------------------------

965 966 967 968 969 970 971 972 973 974 975
#define CATCH_RETRY_FRAME_ERROR(label) \
  label { foreign "C" barf("catch_retry_frame incorrectly entered!"); }

CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_0_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_1_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_2_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_3_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_4_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_5_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_6_ret)
CATCH_RETRY_FRAME_ERROR(stg_catch_retry_frame_7_ret)
976 977 978 979 980 981 982

#if MAX_VECTORED_RTN > 8
#error MAX_VECTORED_RTN has changed: please modify stg_catch_retry_frame too.
#endif

#if defined(PROFILING)
#define CATCH_RETRY_FRAME_BITMAP 7
tharris@microsoft.com's avatar
tharris@microsoft.com committed
983
#define CATCH_RETRY_FRAME_WORDS  5
984 985
#else
#define CATCH_RETRY_FRAME_BITMAP 1
tharris@microsoft.com's avatar
tharris@microsoft.com committed
986
#define CATCH_RETRY_FRAME_WORDS  3
987 988 989 990 991 992 993 994 995 996 997 998 999
#endif

INFO_TABLE_RET(stg_catch_retry_frame,
	       CATCH_RETRY_FRAME_WORDS, CATCH_RETRY_FRAME_BITMAP,
	       CATCH_RETRY_FRAME,
	       stg_catch_retry_frame_0_ret,
	       stg_catch_retry_frame_1_ret,
	       stg_catch_retry_frame_2_ret,
	       stg_catch_retry_frame_3_ret,
	       stg_catch_retry_frame_4_ret,
	       stg_catch_retry_frame_5_ret,
	       stg_catch_retry_frame_6_ret,
	       stg_catch_retry_frame_7_ret)
1000 1001 1002 1003 1004 1005
{
   W_ r, frame, trec, outer;
   IF_NOT_REG_R1(W_ rval;  rval = Sp(0);  Sp_adj(1); )

   frame = Sp;
   trec = StgTSO_trec(CurrentTSO);
1006
   "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
1007
   r = foreign "C" stmCommitNestedTransaction(MyCapability() "ptr", trec "ptr") [];
Simon Marlow's avatar
Simon Marlow committed
1008
   if (r != 0) {
1009 1010 1011 1012 1013 1014
     /* Succeeded (either first branch or second branch) */
     StgTSO_trec(CurrentTSO) = outer;
     Sp = Sp + SIZEOF_StgCatchRetryFrame;
     IF_NOT_REG_R1(Sp_adj(-1); Sp(0) = rval;)
     jump %ENTRY_CODE(Sp(SP_OFF));
   } else {
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1015
     /* Did not commit: re-execute */
1016
     W_ new_trec;
1017
     "ptr" new_trec = foreign "C" stmStartTransaction(MyCapability() "ptr", outer "ptr") [];
1018
     StgTSO_trec(CurrentTSO) = new_trec;
Simon Marlow's avatar
Simon Marlow committed
1019
     if (StgCatchRetryFrame_running_alt_code(frame) != 0::I32) {
1020 1021 1022 1023
       R1 = StgCatchRetryFrame_alt_code(frame);
     } else {
       R1 = StgCatchRetryFrame_first_code(frame);
     }
1024
     jump stg_ap_v_fast;
1025 1026
   }
}
1027 1028 1029 1030 1031


// Atomically frame -------------------------------------------------------------


1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
#define ATOMICALLY_FRAME_ERROR(label) \
  label { foreign "C" barf("atomically_frame incorrectly entered!"); }

ATOMICALLY_FRAME_ERROR(stg_atomically_frame_0_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_1_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_2_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_3_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_4_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_5_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_6_ret)
ATOMICALLY_FRAME_ERROR(stg_atomically_frame_7_ret)
1043 1044 1045 1046 1047 1048

#if MAX_VECTORED_RTN > 8
#error MAX_VECTORED_RTN has changed: please modify stg_atomically_frame too.
#endif

#if defined(PROFILING)
1049
#define ATOMICALLY_FRAME_BITMAP 3
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1050
#define ATOMICALLY_FRAME_WORDS  4
1051
#else
1052
#define ATOMICALLY_FRAME_BITMAP 0
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1053
#define ATOMICALLY_FRAME_WORDS  2
1054 1055
#endif

1056

1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
INFO_TABLE_RET(stg_atomically_frame,
	       ATOMICALLY_FRAME_WORDS, ATOMICALLY_FRAME_BITMAP,
	       ATOMICALLY_FRAME,
	       stg_atomically_frame_0_ret,
	       stg_atomically_frame_1_ret,
	       stg_atomically_frame_2_ret,
	       stg_atomically_frame_3_ret,
	       stg_atomically_frame_4_ret,
	       stg_atomically_frame_5_ret,
	       stg_atomically_frame_6_ret,
	       stg_atomically_frame_7_ret)
1068
{
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1069
  W_ frame, trec, valid, next_invariant, q, outer;
1070
  IF_NOT_REG_R1(W_ rval;  rval = Sp(0);  Sp_adj(1); )
1071

1072 1073
  frame = Sp;
  trec = StgTSO_trec(CurrentTSO);
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1074 1075 1076 1077 1078 1079
  "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];

  if (outer == NO_TREC) {
    /* First time back at the atomically frame -- pick up invariants */
    "ptr" q = foreign "C" stmGetInvariantsToCheck(MyCapability() "ptr", trec "ptr") [];
    StgAtomicallyFrame_next_invariant_to_check(frame) = q;
1080 1081

  } else {
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
    /* Second/subsequent time back at the atomically frame -- abort the
     * tx that's checking the invariant and move on to the next one */
    StgTSO_trec(CurrentTSO) = outer;
    q = StgAtomicallyFrame_next_invariant_to_check(frame);
    StgInvariantCheckQueue_my_execution(q) = trec;
    foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
    /* Don't free trec -- it's linked from q and will be stashed in the
     * invariant if we eventually commit. */
    q = StgInvariantCheckQueue_next_queue_entry(q);
    StgAtomicallyFrame_next_invariant_to_check(frame) = q;
    trec = outer;
  }

  q = StgAtomicallyFrame_next_invariant_to_check(frame);

  if (q != END_INVARIANT_CHECK_QUEUE) {
    /* We can't commit yet: another invariant to check */
    "ptr" trec = foreign "C" stmStartTransaction(MyCapability() "ptr", trec "ptr") [];
1100
    StgTSO_trec(CurrentTSO) = trec;
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1101 1102 1103

    next_invariant = StgInvariantCheckQueue_invariant(q);
    R1 = StgAtomicInvariant_code(next_invariant);
1104
    jump stg_ap_v_fast;
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123

  } else {

    /* We've got no more invariants to check, try to commit */
    valid = foreign "C" stmCommitTransaction(MyCapability() "ptr", trec "ptr") [];
    if (valid != 0) {
      /* Transaction was valid: commit succeeded */
      StgTSO_trec(CurrentTSO) = NO_TREC;
      Sp = Sp + SIZEOF_StgAtomicallyFrame;
      IF_NOT_REG_R1(Sp_adj(-1); Sp(0) = rval;)
      jump %ENTRY_CODE(Sp(SP_OFF));
    } else {
      /* Transaction was not valid: try again */
      "ptr" trec = foreign "C" stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr") [];
      StgTSO_trec(CurrentTSO) = trec;
      StgAtomicallyFrame_next_invariant_to_check(frame) = END_INVARIANT_CHECK_QUEUE;
      R1 = StgAtomicallyFrame_code(frame);
      jump stg_ap_v_fast;
    }
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
  }
}

INFO_TABLE_RET(stg_atomically_waiting_frame,
	       ATOMICALLY_FRAME_WORDS, ATOMICALLY_FRAME_BITMAP,
	       ATOMICALLY_FRAME,
	       stg_atomically_frame_0_ret,
	       stg_atomically_frame_1_ret,
	       stg_atomically_frame_2_ret,
	       stg_atomically_frame_3_ret,
	       stg_atomically_frame_4_ret,
	       stg_atomically_frame_5_ret,
	       stg_atomically_frame_6_ret,
	       stg_atomically_frame_7_ret)
{
  W_ frame, trec, valid;
  IF_NOT_REG_R1(W_ rval;  rval = Sp(0);  Sp_adj(1); )

  frame = Sp;

  /* The TSO is currently waiting: should we stop waiting? */
1145
  valid = foreign "C" stmReWait(MyCapability() "ptr", CurrentTSO "ptr") [];
Simon Marlow's avatar
Simon Marlow committed
1146
  if (valid != 0) {
1147
    /* Previous attempt is still valid: no point trying again yet */
1148 1149 1150
	  IF_NOT_REG_R1(Sp_adj(-2);
			Sp(1) = stg_NO_FINALIZER_closure;
		  	Sp(0) = stg_ut_1_0_unreg_info;)
1151 1152 1153
    jump stg_block_noregs;
  } else {
    /* Previous attempt is no longer valid: try again */
1154
    "ptr" trec = foreign "C" stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr") [];
1155 1156 1157
    StgTSO_trec(CurrentTSO) = trec;
    StgHeader_info(frame) = stg_atomically_frame_info;
    R1 = StgAtomicallyFrame_code(frame);
1158
    jump stg_ap_v_fast;
1159
  }
1160
}
1161 1162 1163

// STM catch frame --------------------------------------------------------------

tharris@microsoft.com's avatar
tharris@microsoft.com committed
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
#define CATCH_STM_FRAME_ENTRY_TEMPLATE(label,ret)          					\
   label                                                   					\
   {                                                       					\
      IF_NOT_REG_R1(W_ rval;  rval = Sp(0);  Sp_adj(1); )  					\
      W_ r, frame, trec, outer; 								\
      frame = Sp; 										\
      trec = StgTSO_trec(CurrentTSO);								\
      "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];				\
      r = foreign "C" stmCommitNestedTransaction(MyCapability() "ptr", trec "ptr") [];		\
      if (r != 0) {										\
        /* Commit succeeded */									\
        StgTSO_trec(CurrentTSO) = outer;							\
        Sp = Sp + SIZEOF_StgCatchSTMFrame;                   					\
        IF_NOT_REG_R1(Sp_adj(-1); Sp(0) = rval;)             					\
        jump ret;                                            					\
      } else {											\
        /* Commit failed */									\
        W_ new_trec;										\
        "ptr" new_trec = foreign "C" stmStartTransaction(MyCapability() "ptr", outer "ptr") [];	\
        StgTSO_trec(CurrentTSO) = new_trec;							\
        R1 = StgCatchSTMFrame_code(frame);							\
        jump stg_ap_v_fast;									\
      }												\
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
   }

#ifdef REG_R1
#define SP_OFF 0
#else
#define SP_OFF 1
#endif

CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_0_ret,%RET_VEC(Sp(SP_OFF),0))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_1_ret,%RET_VEC(Sp(SP_OFF),1))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_2_ret,%RET_VEC(Sp(SP_OFF),2))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_3_ret,%RET_VEC(Sp(SP_OFF),3))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_4_ret,%RET_VEC(Sp(SP_OFF),4))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_5_ret,%RET_VEC(Sp(SP_OFF),5))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_6_ret,%RET_VEC(Sp(SP_OFF),6))
CATCH_STM_FRAME_ENTRY_TEMPLATE(stg_catch_stm_frame_7_ret,%RET_VEC(Sp(SP_OFF),7))

#if MAX_VECTORED_RTN > 8
#error MAX_VECTORED_RTN has changed: please modify stg_catch_stm_frame too.
#endif

#if defined(PROFILING)
#define CATCH_STM_FRAME_BITMAP 3
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1210
#define CATCH_STM_FRAME_WORDS  4
1211 1212
#else
#define CATCH_STM_FRAME_BITMAP 0
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1213
#define CATCH_STM_FRAME_WORDS  2
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
#endif

/* Catch frames are very similar to update frames, but when entering
 * one we just pop the frame off the stack and perform the correct
 * kind of return to the activation record underneath us on the stack.
 */

INFO_TABLE_RET(stg_catch_stm_frame,
	       CATCH_STM_FRAME_WORDS, CATCH_STM_FRAME_BITMAP,
	       CATCH_STM_FRAME,
	       stg_catch_stm_frame_0_ret,
	       stg_catch_stm_frame_1_ret,
	       stg_catch_stm_frame_2_ret,
	       stg_catch_stm_frame_3_ret,
	       stg_catch_stm_frame_4_ret,
	       stg_catch_stm_frame_5_ret,
	       stg_catch_stm_frame_6_ret,
	       stg_catch_stm_frame_7_ret)
CATCH_STM_FRAME_ENTRY_TEMPLATE(,%ENTRY_CODE(Sp(SP_OFF)))


// Primop definition ------------------------------------------------------------

atomicallyzh_fast
{
  W_ frame;
  W_ old_trec;
  W_ new_trec;
  
1243 1244 1245
  // stmStartTransaction may allocate
  MAYBE_GC (R1_PTR, atomicallyzh_fast); 

1246 1247 1248
  /* Args: R1 = m :: STM a */
  STK_CHK_GEN(SIZEOF_StgAtomicallyFrame + WDS(1), R1_PTR, atomicallyzh_fast);

1249 1250 1251 1252
  old_trec = StgTSO_trec(CurrentTSO);

  /* Nested transactions are not allowed; raise an exception */
  if (old_trec != NO_TREC) {
1253
     R1 = base_GHCziIOBase_NestedAtomically_closure;
1254 1255 1256
     jump raisezh_fast;
  }

1257 1258 1259 1260
  /* Set up the atomically frame */
  Sp = Sp - SIZEOF_StgAtomicallyFrame;
  frame = Sp;

1261
  SET_HDR(frame,stg_atomically_frame_info, W_[CCCS]);
1262
  StgAtomicallyFrame_code(frame) = R1;
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1263
  StgAtomicallyFrame_next_invariant_to_check(frame) = END_INVARIANT_CHECK_QUEUE;
1264 1265

  /* Start the memory transcation */
1266
  "ptr" new_trec = foreign "C" stmStartTransaction(MyCapability() "ptr", old_trec "ptr") [R1];
1267 1268 1269
  StgTSO_trec(CurrentTSO) = new_trec;

  /* Apply R1 to the realworld token */
1270
  jump stg_ap_v_fast;
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
}


catchSTMzh_fast
{
  W_ frame;
  
  /* Args: R1 :: STM a */
  /* Args: R2 :: Exception -> STM a */
  STK_CHK_GEN(SIZEOF_StgCatchSTMFrame + WDS(1), R1_PTR & R2_PTR, catchSTMzh_fast);

  /* Set up the catch frame */
  Sp = Sp - SIZEOF_StgCatchSTMFrame;
  frame = Sp;

1286
  SET_HDR(frame, stg_catch_stm_frame_info, W_[CCCS]);
1287
  StgCatchSTMFrame_handler(frame) = R2;
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1288 1289 1290 1291 1292 1293 1294 1295
  StgCatchSTMFrame_code(frame) = R1;

  /* Start a nested transaction to run the body of the try block in */
  W_ cur_trec;  
  W_ new_trec;
  cur_trec = StgTSO_trec(CurrentTSO);
  "ptr" new_trec = foreign "C" stmStartTransaction(MyCapability() "ptr", cur_trec "ptr");
  StgTSO_trec(CurrentTSO) = new_trec;
1296 1297

  /* Apply R1 to the realworld token */
1298
  jump stg_ap_v_fast;
1299 1300 1301 1302 1303 1304 1305 1306 1307
}


catchRetryzh_fast
{
  W_ frame;
  W_ new_trec;
  W_ trec;

1308 1309 1310
  // stmStartTransaction may allocate
  MAYBE_GC (R1_PTR & R2_PTR, catchRetryzh_fast); 

1311 1312 1313 1314 1315 1316
  /* Args: R1 :: STM a */
  /* Args: R2 :: STM a */
  STK_CHK_GEN(SIZEOF_StgCatchRetryFrame + WDS(1), R1_PTR & R2_PTR, catchRetryzh_fast);

  /* Start a nested transaction within which to run the first code */
  trec = StgTSO_trec(CurrentTSO);
1317
  "ptr" new_trec = foreign "C" stmStartTransaction(MyCapability() "ptr", trec "ptr") [R1,R2];
1318 1319 1320 1321 1322 1323
  StgTSO_trec(CurrentTSO) = new_trec;

  /* Set up the catch-retry frame */
  Sp = Sp - SIZEOF_StgCatchRetryFrame;
  frame = Sp;
  
1324
  SET_HDR(frame, stg_catch_retry_frame_info, W_[CCCS]);
1325
  StgCatchRetryFrame_running_alt_code(frame) = 0 :: CInt; // false;
1326 1327 1328 1329
  StgCatchRetryFrame_first_code(frame) = R1;
  StgCatchRetryFrame_alt_code(frame) = R2;

  /* Apply R1 to the realworld token */
1330
  jump stg_ap_v_fast;
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
}


retryzh_fast
{
  W_ frame_type;
  W_ frame;
  W_ trec;
  W_ outer;
  W_ r;

1342
  MAYBE_GC (NO_PTRS, retryzh_fast); // STM operations may allocate
1343 1344 1345 1346

  // Find the enclosing ATOMICALLY_FRAME or CATCH_RETRY_FRAME
retry_pop_stack:
  StgTSO_sp(CurrentTSO) = Sp;
1347
  frame_type = foreign "C" findRetryFrameHelper(CurrentTSO "ptr") [];
1348 1349
  Sp = StgTSO_sp(CurrentTSO);
  frame = Sp;
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1350 1351
  trec = StgTSO_trec(CurrentTSO);
  "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
1352 1353 1354 1355

  if (frame_type == CATCH_RETRY_FRAME) {
    // The retry reaches a CATCH_RETRY_FRAME before the atomic frame
    ASSERT(outer != NO_TREC);
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1356 1357 1358
    // Abort the transaction attempting the current branch
    foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
    foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr") [];
Simon Marlow's avatar
Simon Marlow committed
1359
    if (!StgCatchRetryFrame_running_alt_code(frame) != 0::I32) {
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1360
      // Retry in the first branch: try the alternative
1361
      "ptr" trec = foreign "C" stmStartTransaction(MyCapability() "ptr", outer "ptr") [];
1362
      StgTSO_trec(CurrentTSO) = trec;
1363
      StgCatchRetryFrame_running_alt_code(frame) = 1 :: CInt; // true;
1364
      R1 = StgCatchRetryFrame_alt_code(frame);
1365
      jump stg_ap_v_fast;
1366
    } else {
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1367 1368 1369 1370
      // Retry in the alternative code: propagate the retry
      StgTSO_trec(CurrentTSO) = outer;
      Sp = Sp + SIZEOF_StgCatchRetryFrame;
      goto retry_pop_stack;
1371 1372 1373 1374 1375
    }
  }

  // We've reached the ATOMICALLY_FRAME: attempt to wait 
  ASSERT(frame_type == ATOMICALLY_FRAME);
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
  if (outer != NO_TREC) {
    // We called retry while checking invariants, so abort the current
    // invariant check (merging its TVar accesses into the parents read
    // set so we'll wait on them)
    foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
    foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr") [];
    trec = outer;
     StgTSO_trec(CurrentTSO) = trec;
    "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
  }
1386
  ASSERT(outer == NO_TREC);
tharris@microsoft.com's avatar
tharris@microsoft.com committed
1387

1388
  r = foreign "C" stmWait(MyCapability() "ptr", CurrentTSO "ptr", trec "ptr") [];
Simon Marlow's avatar
Simon Marlow committed
1389
  if (r != 0) {
1390
    // Transaction was valid: stmWait put us on the TVars' queues, we now block
1391
    StgHeader_info(frame) = stg_atomically_waiting_frame_info;
1392
    Sp = frame;
1393 1394 1395 1396
    // Fix up the stack in the unregisterised case: the return convention is different.
    IF_NOT_REG_R1(Sp_adj(-2); 
		  Sp(1) = stg_NO_FINALIZER_closure;
		  Sp(0) = stg_ut_1_0_unreg_info;)
1397 1398
    R3 = trec; // passing to stmWaitUnblock()
    jump stg_block_stmwait;
1399 1400
  } else {
    // Transaction was not valid: retry immediately
1401
    "ptr" trec = foreign "C" stmStartTransaction(MyCapability() "ptr", outer "ptr") [];
1402 1403 1404
    StgTSO_trec(CurrentTSO) = trec;
    R1 = StgAtomicallyFrame_code(frame);
    Sp = frame;
1405
    jump stg_ap_v_fast;
1406 1407 1408 1409
  }
}


tharris@microsoft.com's avatar
tharris@microsoft.com committed
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
checkzh_fast
{
  W_ trec, closure;

  /* Args: R1 = invariant closure */
  MAYBE_GC (R1_PTR, checkzh_fast); 

  trec = StgTSO_trec(CurrentTSO);
  closure = R1;
  foreign "C" stmAddInvariantToCheck(MyCapability() "ptr", 
                                     trec "ptr",
                                     closure "ptr") [];

  jump %ENTRY_CODE(Sp(0));
}


1427 1428 1429
newTVarzh_fast
{
  W_ tv;
1430
  W_ new_value;
1431 1432 1433

  /* Args: R1 = initialisation value */

1434 1435
  MAYBE_GC (R1_PTR, newTVarzh_fast); 
  new_value = R1;
1436
  "ptr" tv = foreign "C" stmNewTVar(MyCapability() "ptr", new_value "ptr") [];
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
  RET_P(tv);
}


readTVarzh_fast
{
  W_ trec;
  W_ tvar;
  W_ result;

  /* Args: R1 = TVar closure */

  MAYBE_GC (R1_PTR, readTVarzh_fast); // Call to stmReadTVar may allocate
  trec = StgTSO_trec(CurrentTSO);
  tvar = R1;
1452
  "ptr" result = foreign "C" stmReadTVar(MyCapability() "ptr", trec "ptr", tvar "ptr") [];
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470

  RET_P(result);
}


writeTVarzh_fast
{
  W_ trec;
  W_ tvar;
  W_ new_value;
  
  /* Args: R1 = TVar closure */
  /*       R2 = New value    */

  MAYBE_GC (R1_PTR & R2_PTR, writeTVarzh_fast); // Call to stmWriteTVar may allocate
  trec = StgTSO_trec(CurrentTSO);
  tvar = R1;
  new_value = R2;
1471
  foreign "C" stmWriteTVar(MyCapability() "ptr", trec "ptr", tvar "ptr", new_value "ptr") [];
1472 1473 1474 1475 1476

  jump %ENTRY_CODE(Sp(0));
}


1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
/* -----------------------------------------------------------------------------
 * MVar primitives
 *
 * take & putMVar work as follows.  Firstly, an important invariant:
 *
 *    If the MVar is full, then the blocking queue contains only
 *    threads blocked on putMVar, and if the MVar is empty then the
 *    blocking queue contains only threads blocked on takeMVar.
 *
 * takeMvar:
 *    MVar empty : then add ourselves to the blocking queue
 *    MVar full  : remove the value from the MVar, and
 *                 blocking queue empty     : return
 *                 blocking queue non-empty : perform the first blocked putMVar
 *                                            from the queue, and wake up the
 *                                            thread (MVar is now full again)
 *
 * putMVar is just the dual of the above algorithm.
 *
 * How do we "perform a putMVar"?  Well, we have to fiddle around with
 * the stack of the thread waiting to do the putMVar.  See
 * stg_block_putmvar and stg_block_takemvar in HeapStackCheck.c for
 * the stack layout, and the PerformPut and PerformTake macros below.
 *
 * It is important that a blocked take or put is woken up with the
 * take/put already performed, because otherwise there would be a
 * small window of vulnerability where the thread could receive an
 * exception and never perform its take or put, and we'd end up with a
 * deadlock.
 *
 * -------------------------------------------------------------------------- */

isEmptyMVarzh_fast
{
    /* args: R1 = MVar closure */

    if (GET_INFO(R1) == stg_EMPTY_MVAR_info) {
	RET_N(1);
1515 1516
    } else {
	RET_N(0);
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
    }
}

newMVarzh_fast
{
    /* args: none */
    W_ mvar;

    ALLOC_PRIM ( SIZEOF_StgMVar, NO_PTRS, newMVarzh_fast );
  
    mvar = Hp - SIZEOF_StgMVar + WDS(1);
    SET_HDR(mvar,stg_EMPTY_MVAR_info,W_[CCCS]);
    StgMVar_head(mvar)  = stg_END_TSO_QUEUE_closure;
    StgMVar_tail(mvar)  = stg_END_TSO_QUEUE_closure;
    StgMVar_value(mvar) = stg_END_TSO_QUEUE_closure;
    RET_P(mvar);
}


/* If R1 isn't available, pass it on the stack */
#ifdef REG_R1
#define PerformTake(tso, value)				\
    W_[StgTSO_sp(tso) + WDS(1)] = value;		\
    W_[StgTSO_sp(tso) + WDS(0)] = stg_gc_unpt_r1_info;
#else
#define PerformTake(tso, value)					\
    W_[StgTSO_sp(tso) + WDS(1)] = value;			\
    W_[StgTSO_sp(tso) + WDS(0)] = stg_ut_1_0_unreg_info;
#endif

#define PerformPut(tso,lval)			\
    StgTSO_sp(tso) = StgTSO_sp(tso) + WDS(3);	\
    lval = W_[StgTSO_sp(tso) - WDS(1)];

takeMVarzh_fast
{
    W_ mvar, val, info, tso;

    /* args: R1 = MVar closure */
    mvar = R1;

1558
#if defined(THREADED_RTS)
1559
    "ptr" info = foreign "C" lockClosure(mvar "ptr") [];
1560
#else
1561
    info = GET_INFO(mvar);
1562
#endif
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593

    /* If the MVar is empty, put ourselves on its blocking queue,
     * and wait until we're woken up.
     */
    if (info == stg_EMPTY_MVAR_info) {
	if (StgMVar_head(mvar) == stg_END_TSO_QUEUE_closure) {
	    StgMVar_head(mvar) = CurrentTSO;
	} else {
	    StgTSO_link(StgMVar_tail(mvar)) = CurrentTSO;
	}
	StgTSO_link(CurrentTSO)        = stg_END_TSO_QUEUE_closure;
	StgTSO_why_blocked(CurrentTSO) = BlockedOnMVar::I16;
	StgTSO_block_info(CurrentTSO)  = mvar;
	StgMVar_tail(mvar) = CurrentTSO;
	
	jump stg_block_takemvar;
  }

  /* we got the value... */
  val = StgMVar_value(mvar);

  if (StgMVar_head(mvar) != stg_END_TSO_QUEUE_closure)
  {
      /* There are putMVar(s) waiting... 
       * wake up the first thread on the queue
       */
      ASSERT(StgTSO_why_blocked(StgMVar_head(mvar)) == BlockedOnMVar::I16);

      /* actually perform the putMVar for the thread that we just woke up */
      tso = StgMVar_head(mvar);
      PerformPut(tso,StgMVar_value(mvar));
1594
      dirtyTSO(tso);
1595 1596 1597

#if defined(GRAN) || defined(PAR)
      /* ToDo: check 2nd arg (mvar) is right */
1598
      "ptr" tso = foreign "C" unblockOne(StgMVar_head(mvar),mvar) [];
1599 1600
      StgMVar_head(mvar) = tso;
#else
1601 1602
      "ptr" tso = foreign "C" unblockOne(MyCapability() "ptr", 
				         StgMVar_head(mvar) "ptr") [];
1603 1604
      StgMVar_head(mvar) = tso;
#endif
1605

1606 1607 1608
      if (StgMVar_head(mvar) == stg_END_TSO_QUEUE_closure) {
	  StgMVar_tail(mvar) = stg_END_TSO_QUEUE_closure;
      }
1609

1610
#if defined(THREADED_RTS)
1611
      foreign "C" unlockClosure(mvar "ptr", stg_FULL_MVAR_info) [];
1612
#endif
1613 1614 1615 1616 1617 1618
      RET_P(val);
  } 
  else
  {
      /* No further putMVars, MVar is now empty */
      StgMVar_value(mvar) = stg_END_TSO_QUEUE_closure;
1619
 
1620
#if defined(THREADED_RTS)
1621
      foreign "C" unlockClosure(mvar "ptr", stg_EMPTY_MVAR_info) [];
1622
#else
1623
      SET_INFO(mvar,stg_EMPTY_MVAR_info);
1624
#endif
1625

1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638
      RET_P(val);
  }
}


tryTakeMVarzh_fast
{
    W_ mvar, val, info, tso;

    /* args: R1 = MVar closure */

    mvar = R1;

1639
#if defined(THREADED_RTS)
1640
    "ptr" info = foreign "C" lockClosure(mvar "ptr") [];
1641
#else
1642
    info = GET_INFO(mvar);
1643
#endif
1644 1645

    if (info == stg_EMPTY_MVAR_info) {
1646
#if defined(THREADED_RTS)
1647
        foreign "C" unlockClosure(mvar "ptr", stg_EMPTY_MVAR_info) [];
1648
#endif
1649 1650 1651 1652 1653 1654 1655 1656 1657 1658
	/* HACK: we need a pointer to pass back, 
	 * so we abuse NO_FINALIZER_closure
	 */
	RET_NP(0, stg_NO_FINALIZER_closure);
    }

    /* we got the value... */
    val = StgMVar_value(mvar);

    if (StgMVar_head(mvar) != stg_END_TSO_QUEUE_closure) {
1659

1660 1661 1662 1663 1664 1665 1666 1667
	/* There are putMVar(s) waiting... 
	 * wake up the first thread on the queue
	 */
	ASSERT(StgTSO_why_blocked(StgMVar_head(mvar)) == BlockedOnMVar::I16);

	/* actually perform the putMVar for the thread that we just woke up */
	tso = StgMVar_head(mvar);
	PerformPut(tso,StgMVar_value(mvar));
1668
        dirtyTSO(tso);
1669 1670 1671

#if defined(GRAN) || defined(PAR)
	/* ToDo: check 2nd arg (mvar) is right */
1672
	"ptr" tso = foreign "C" unblockOne(StgMVar_head(mvar) "ptr", mvar "ptr") [];
1673 1674
	StgMVar_head(mvar) = tso;
#else
1675 1676
	"ptr" tso = foreign "C" unblockOne(MyCapability() "ptr",
					   StgMVar_head(mvar) "ptr") [];
1677 1678 1679 1680 1681 1682
	StgMVar_head(mvar) = tso;
#endif

	if (StgMVar_head(mvar) == stg_END_TSO_QUEUE_closure) {
	    StgMVar_tail(mvar) = stg_END_TSO_QUEUE_closure;
	}
1683
#if defined(THREADED_RTS)
1684
        foreign "C" unlockClosure(mvar "ptr", stg_FULL_MVAR_info) [];
1685
#endif
1686 1687 1688 1689 1690
    }
    else 
    {
	/* No further putMVars, MVar is now empty */
	StgMVar_value(mvar) = stg_END_TSO_QUEUE_closure;
1691
#if defined(THREADED_RTS)
1692
    	foreign "C" unlockClosure(mvar "ptr", stg_EMPTY_MVAR_info) [];
1693
#else
1694
	SET_INFO(mvar,stg_EMPTY_MVAR_info);
1695
#endif
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
    }
    
    RET_NP(1, val);
}


putMVarzh_fast
{
    W_ mvar, info, tso;

    /* args: R1 = MVar, R2 = value */
    mvar = R1;

1709
#if defined(THREADED_RTS)
1710
    "ptr" info = foreign "C" lockClosure(mvar "ptr") [R2];
1711
#else
simonmar's avatar