rts/StgMiscClosures.cmm

   1 /* ----------------------------------------------------------------------------
   2  *
   3  * (c) The GHC Team, 1998-2004
   4  *
   5  * Entry code for various built-in closure types.
   6  *
   7  * This file is written in a subset of C--, extended with various
   8  * features specific to GHC.  It is compiled by GHC directly.  For the
   9  * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
  10  *
  11  * --------------------------------------------------------------------------*/
  12
  13 #include "Cmm.h"
  14
  15 import pthread_mutex_lock;
  16 import base_GHCziBase_Czh_static_info;
  17 import base_GHCziBase_Izh_static_info;
  18 import EnterCriticalSection;
  19 import LeaveCriticalSection;
  20
  21 /* ----------------------------------------------------------------------------
  22    Support for the bytecode interpreter.
  23    ------------------------------------------------------------------------- */
  24
  25 /* 9 bits of return code for constructors created by the interpreter. */
  26 stg_interp_constr_entry
  27 {
  28     /* R1 points at the constructor */
  29     jump %ENTRY_CODE(Sp(0));
  30 }
  31
  32 /* Some info tables to be used when compiled code returns a value to
  33    the interpreter, i.e. the interpreter pushes one of these onto the
  34    stack before entering a value.  What the code does is to
  35    impedance-match the compiled return convention (in R1p/R1n/F1/D1 etc) to
  36    the interpreter's convention (returned value is on top of stack),
  37    and then cause the scheduler to enter the interpreter.
  38
  39    On entry, the stack (growing down) looks like this:
  40
  41       ptr to BCO holding return continuation
  42       ptr to one of these info tables.
  43
  44    The info table code, both direct and vectored, must:
  45       * push R1/F1/D1 on the stack, and its tag if necessary
  46       * push the BCO (so it's now on the stack twice)
  47       * Yield, ie, go to the scheduler.
  48
  49    Scheduler examines the t.o.s, discovers it is a BCO, and proceeds
  50    directly to the bytecode interpreter.  That pops the top element
  51    (the BCO, containing the return continuation), and interprets it.
  52    Net result: return continuation gets interpreted, with the
  53    following stack:
  54
  55       ptr to this BCO
  56       ptr to the info table just jumped thru
  57       return value
  58
  59    which is just what we want -- the "standard" return layout for the
  60    interpreter.  Hurrah!
  61
  62    Don't ask me how unboxed tuple returns are supposed to work.  We
  63    haven't got a good story about that yet.
  64 */
  65
  66 INFO_TABLE_RET( stg_ctoi_R1p, RET_BCO)
  67 {
  68     Sp_adj(-2);
  69     Sp(1) = R1;
  70     Sp(0) = stg_enter_info;
  71     jump stg_yield_to_interpreter;
  72 }
  73
  74 /*
  75  * When the returned value is a pointer, but unlifted, in R1 ...
  76  */
  77 INFO_TABLE_RET( stg_ctoi_R1unpt, RET_BCO )
  78 {
  79     Sp_adj(-2);
  80     Sp(1) = R1;
  81     Sp(0) = stg_gc_unpt_r1_info;
  82     jump stg_yield_to_interpreter;
  83 }
  84
  85 /*
  86  * When the returned value is a non-pointer in R1 ...
  87  */
  88 INFO_TABLE_RET( stg_ctoi_R1n, RET_BCO )
  89 {
  90     Sp_adj(-2);
  91     Sp(1) = R1;
  92     Sp(0) = stg_gc_unbx_r1_info;
  93     jump stg_yield_to_interpreter;
  94 }
  95
  96 /*
  97  * When the returned value is in F1
  98  */
  99 INFO_TABLE_RET( stg_ctoi_F1, RET_BCO )
 100 {
 101     Sp_adj(-2);
 102     F_[Sp + WDS(1)] = F1;
 103     Sp(0) = stg_gc_f1_info;
 104     jump stg_yield_to_interpreter;
 105 }
 106
 107 /*
 108  * When the returned value is in D1
 109  */
 110 INFO_TABLE_RET( stg_ctoi_D1, RET_BCO )
 111 {
 112     Sp_adj(-1) - SIZEOF_DOUBLE;
 113     D_[Sp + WDS(1)] = D1;
 114     Sp(0) = stg_gc_d1_info;
 115     jump stg_yield_to_interpreter;
 116 }
 117
 118 /*
 119  * When the returned value is in L1
 120  */
 121 INFO_TABLE_RET( stg_ctoi_L1, RET_BCO )
 122 {
 123     Sp_adj(-1) - 8;
 124     L_[Sp + WDS(1)] = L1;
 125     Sp(0) = stg_gc_l1_info;
 126     jump stg_yield_to_interpreter;
 127 }
 128
 129 /*
 130  * When the returned value is a void
 131  */
 132 INFO_TABLE_RET( stg_ctoi_V, RET_BCO )
 133 {
 134     Sp_adj(-1);
 135     Sp(0) = stg_gc_void_info;
 136     jump stg_yield_to_interpreter;
 137 }
 138
 139 /*
 140  * Dummy info table pushed on the top of the stack when the interpreter
 141  * should apply the BCO on the stack to its arguments, also on the
 142  * stack.
 143  */
 144 INFO_TABLE_RET( stg_apply_interp, RET_BCO )
 145 {
 146     /* Just in case we end up in here... (we shouldn't) */
 147     jump stg_yield_to_interpreter;
 148 }
 149
 150 /* ----------------------------------------------------------------------------
 151    Entry code for a BCO
 152    ------------------------------------------------------------------------- */
 153
 154 INFO_TABLE_FUN( stg_BCO, 4, 0, BCO, "BCO", "BCO", ARG_BCO )
 155 {
 156   /* entering a BCO means "apply it", same as a function */
 157   Sp_adj(-2);
 158   Sp(1) = R1;
 159   Sp(0) = stg_apply_interp_info;
 160   jump stg_yield_to_interpreter;
 161 }
 162
 163 /* ----------------------------------------------------------------------------
 164    Info tables for indirections.
 165
 166    SPECIALISED INDIRECTIONS: we have a specialised indirection for direct returns,
 167    so that we can avoid entering
 168    the object when we know it points directly to a value.  The update
 169    code (Updates.cmm) updates objects with the appropriate kind of
 170    indirection.  We only do this for young-gen indirections.
 171    ------------------------------------------------------------------------- */
 172
 173 INFO_TABLE(stg_IND,1,0,IND,"IND","IND")
 174 {
 175     TICK_ENT_DYN_IND(); /* tick */
 176     R1 = UNTAG(StgInd_indirectee(R1));
 177     TICK_ENT_VIA_NODE();
 178     jump %GET_ENTRY(R1);
 179 }
 180
 181 INFO_TABLE(stg_IND_direct,1,0,IND,"IND","IND")
 182 {
 183     TICK_ENT_DYN_IND(); /* tick */
 184     R1 = StgInd_indirectee(R1);
 185     TICK_ENT_VIA_NODE();
 186     jump %ENTRY_CODE(Sp(0));
 187 }
 188
 189 INFO_TABLE(stg_IND_STATIC,1,0,IND_STATIC,"IND_STATIC","IND_STATIC")
 190 {
 191     TICK_ENT_STATIC_IND();      /* tick */
 192     R1 = UNTAG(StgInd_indirectee(R1));
 193     TICK_ENT_VIA_NODE();
 194     jump %GET_ENTRY(R1);
 195 }
 196
 197 INFO_TABLE(stg_IND_PERM,1,0,IND_PERM,"IND_PERM","IND_PERM")
 198 {
 199     /* Don't add INDs to granularity cost */
 200
 201     /* Don't: TICK_ENT_STATIC_IND(Node); for ticky-ticky; this ind is
 202        here only to help profiling */
 203
 204 #if defined(TICKY_TICKY) && !defined(PROFILING)
 205     /* TICKY_TICKY && !PROFILING means PERM_IND *replaces* an IND, rather than
 206        being extra  */
 207     TICK_ENT_PERM_IND();
 208 #endif
 209
 210     LDV_ENTER(R1);
 211
 212     /* Enter PAP cost centre */
 213     ENTER_CCS_PAP_CL(R1);
 214
 215     /* For ticky-ticky, change the perm_ind to a normal ind on first
 216      * entry, so the number of ent_perm_inds is the number of *thunks*
 217      * entered again, not the number of subsequent entries.
 218      *
 219      * Since this screws up cost centres, we die if profiling and
 220      * ticky_ticky are on at the same time.  KSW 1999-01.
 221      */
 222 #ifdef TICKY_TICKY
 223 #  ifdef PROFILING
 224 #    error Profiling and ticky-ticky do not mix at present!
 225 #  endif  /* PROFILING */
 226     StgHeader_info(R1) = stg_IND_info;
 227 #endif /* TICKY_TICKY */
 228
 229     R1 = UNTAG(StgInd_indirectee(R1));
 230
 231 #if defined(TICKY_TICKY) && !defined(PROFILING)
 232     TICK_ENT_VIA_NODE();
 233 #endif
 234
 235     jump %GET_ENTRY(R1);
 236 }
 237
 238
 239 INFO_TABLE(stg_IND_OLDGEN,1,0,IND_OLDGEN,"IND_OLDGEN","IND_OLDGEN")
 240 {
 241     TICK_ENT_STATIC_IND();      /* tick */
 242     R1 = UNTAG(StgInd_indirectee(R1));
 243     TICK_ENT_VIA_NODE();
 244     jump %GET_ENTRY(R1);
 245 }
 246
 247 INFO_TABLE(stg_IND_OLDGEN_PERM,1,0,IND_OLDGEN_PERM,"IND_OLDGEN_PERM","IND_OLDGEN_PERM")
 248 {
 249     /* Don't: TICK_ENT_STATIC_IND(Node); for ticky-ticky;
 250        this ind is here only to help profiling */
 251
 252 #if defined(TICKY_TICKY) && !defined(PROFILING)
 253     /* TICKY_TICKY && !PROFILING means PERM_IND *replaces* an IND,
 254        rather than being extra  */
 255     TICK_ENT_PERM_IND(); /* tick */
 256 #endif
 257
 258     LDV_ENTER(R1);
 259
 260     /* Enter PAP cost centre -- lexical scoping only */
 261     ENTER_CCS_PAP_CL(R1);
 262
 263     /* see comment in IND_PERM */
 264 #ifdef TICKY_TICKY
 265 #  ifdef PROFILING
 266 #    error Profiling and ticky-ticky do not mix at present!
 267 #  endif  /* PROFILING */
 268     StgHeader_info(R1) = stg_IND_OLDGEN_info;
 269 #endif /* TICKY_TICKY */
 270
 271     R1 = UNTAG(StgInd_indirectee(R1));
 272
 273     TICK_ENT_VIA_NODE();
 274     jump %GET_ENTRY(R1);
 275 }
 276
 277 /* ----------------------------------------------------------------------------
 278    Black holes.
 279
 280    Entering a black hole normally causes a cyclic data dependency, but
 281    in the concurrent world, black holes are synchronization points,
 282    and they are turned into blocking queues when there are threads
 283    waiting for the evaluation of the closure to finish.
 284    ------------------------------------------------------------------------- */
 285
 286 /* Note: a BLACKHOLE must be big enough to be
 287  * overwritten with an indirection/evacuee/catch.  Thus we claim it
 288  * has 1 non-pointer word of payload.
 289  */
 290 INFO_TABLE(stg_BLACKHOLE,0,1,BLACKHOLE,"BLACKHOLE","BLACKHOLE")
 291 {
 292 #if defined(GRAN)
 293     /* Before overwriting TSO_LINK */
 294     STGCALL3(GranSimBlock,CurrentTSO,CurrentProc,(StgClosure *)R1 /*Node*/);
 295 #endif
 296
 297     TICK_ENT_BH();
 298
 299 #ifdef THREADED_RTS
 300     // foreign "C" debugBelch("BLACKHOLE entry\n");
 301 #endif
 302
 303     /* Actually this is not necessary because R1 is about to be destroyed. */
 304     LDV_ENTER(R1);
 305
 306 #if defined(THREADED_RTS)
 307     ACQUIRE_LOCK(sched_mutex "ptr");
 308     // released in stg_block_blackhole_finally
 309 #endif
 310
 311     /* Put ourselves on the blackhole queue */
 312     StgTSO__link(CurrentTSO) = W_[blackhole_queue];
 313     W_[blackhole_queue] = CurrentTSO;
 314
 315     /* jot down why and on what closure we are blocked */
 316     StgTSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
 317     StgTSO_block_info(CurrentTSO) = R1;
 318
 319     jump stg_block_blackhole;
 320 }
 321
 322 #if defined(PAR) || defined(GRAN)
 323
 324 INFO_TABLE(stg_RBH,1,1,RBH,"RBH","RBH")
 325 {
 326 # if defined(GRAN)
 327     /* mainly statistics gathering for GranSim simulation */
 328     STGCALL3(GranSimBlock,CurrentTSO,CurrentProc,(StgClosure *)R1 /*Node*/);
 329 # endif
 330
 331     /* exactly the same as a BLACKHOLE_BQ_entry -- HWL */
 332     /* Put ourselves on the blocking queue for this black hole */
 333     TSO_link(CurrentTSO) = StgBlockingQueue_blocking_queue(R1);
 334     StgBlockingQueue_blocking_queue(R1) = CurrentTSO;
 335     /* jot down why and on what closure we are blocked */
 336     TSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
 337     TSO_block_info(CurrentTSO) = R1;
 338
 339     /* PAR: dumping of event now done in blockThread -- HWL */
 340
 341     /* stg_gen_block is too heavyweight, use a specialised one */
 342     jump stg_block_1;
 343 }
 344
 345 INFO_TABLE(stg_RBH_Save_0,0,2,CONSTR,"RBH_Save_0","RBH_Save_0")
 346 { foreign "C" barf("RBH_Save_0 object entered!") never returns; }
 347
 348 INFO_TABLE(stg_RBH_Save_1,1,1,CONSTR,"RBH_Save_1","RBH_Save_1");
 349 { foreign "C" barf("RBH_Save_1 object entered!") never returns; }
 350
 351 INFO_TABLE(stg_RBH_Save_2,2,0,CONSTR,"RBH_Save_2","RBH_Save_2");
 352 { foreign "C" barf("RBH_Save_2 object entered!") never returns; }
 353
 354 #endif /* defined(PAR) || defined(GRAN) */
 355
 356 /* identical to BLACKHOLEs except for the infotag */
 357 INFO_TABLE(stg_CAF_BLACKHOLE,0,1,CAF_BLACKHOLE,"CAF_BLACKHOLE","CAF_BLACKHOLE")
 358 {
 359 #if defined(GRAN)
 360     /* mainly statistics gathering for GranSim simulation */
 361     STGCALL3(GranSimBlock,CurrentTSO,CurrentProc,(StgClosure *)R1 /*Node*/);
 362 #endif
 363
 364     TICK_ENT_BH();
 365     LDV_ENTER(R1);
 366
 367 #if defined(THREADED_RTS)
 368     // foreign "C" debugBelch("BLACKHOLE entry\n");
 369 #endif
 370
 371 #if defined(THREADED_RTS)
 372     ACQUIRE_LOCK(sched_mutex "ptr");
 373     // released in stg_block_blackhole_finally
 374 #endif
 375
 376     /* Put ourselves on the blackhole queue */
 377     StgTSO__link(CurrentTSO) = W_[blackhole_queue];
 378     W_[blackhole_queue] = CurrentTSO;
 379
 380     /* jot down why and on what closure we are blocked */
 381     StgTSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
 382     StgTSO_block_info(CurrentTSO) = R1;
 383
 384     jump stg_block_blackhole;
 385 }
 386
 387 #ifdef EAGER_BLACKHOLING
 388 INFO_TABLE(stg_SE_BLACKHOLE,0,1,SE_BLACKHOLE,"SE_BLACKHOLE","SE_BLACKHOLE")
 389 { foreign "C" barf("SE_BLACKHOLE object entered!") never returns; }
 390
 391 INFO_TABLE(stg_SE_CAF_BLACKHOLE,0,1,SE_CAF_BLACKHOLE,"SE_CAF_BLACKHOLE","SE_CAF_BLACKHOLE")
 392 { foreign "C" barf("SE_CAF_BLACKHOLE object entered!") never returns; }
 393 #endif
 394
 395 /* ----------------------------------------------------------------------------
 396    Whiteholes are used for the "locked" state of a closure (see lockClosure())
 397    ------------------------------------------------------------------------- */
 398
 399 INFO_TABLE(stg_WHITEHOLE, 0,0, WHITEHOLE, "WHITEHOLE", "WHITEHOLE")
 400 { foreign "C" barf("WHITEHOLE object entered!") never returns; }
 401
 402 /* ----------------------------------------------------------------------------
 403    Some static info tables for things that don't get entered, and
 404    therefore don't need entry code (i.e. boxed but unpointed objects)
 405    NON_ENTERABLE_ENTRY_CODE now defined at the beginning of the file
 406    ------------------------------------------------------------------------- */
 407
 408 INFO_TABLE(stg_TSO, 0,0,TSO, "TSO", "TSO")
 409 { foreign "C" barf("TSO object entered!") never returns; }
 410
 411 /* ----------------------------------------------------------------------------
 412    Evacuees are left behind by the garbage collector.  Any attempt to enter
 413    one is a real bug.
 414    ------------------------------------------------------------------------- */
 415
 416 INFO_TABLE(stg_EVACUATED,1,0,EVACUATED,"EVACUATED","EVACUATED")
 417 { foreign "C" barf("EVACUATED object entered!") never returns; }
 418
 419 /* ----------------------------------------------------------------------------
 420    Weak pointers
 421
 422    Live weak pointers have a special closure type.  Dead ones are just
 423    nullary constructors (although they live on the heap - we overwrite
 424    live weak pointers with dead ones).
 425    ------------------------------------------------------------------------- */
 426
 427 INFO_TABLE(stg_WEAK,0,4,WEAK,"WEAK","WEAK")
 428 { foreign "C" barf("WEAK object entered!") never returns; }
 429
 430 /*
 431  * It's important when turning an existing WEAK into a DEAD_WEAK
 432  * (which is what finalizeWeak# does) that we don't lose the link
 433  * field and break the linked list of weak pointers.  Hence, we give
 434  * DEAD_WEAK 4 non-pointer fields, the same as WEAK.
 435  */
 436 INFO_TABLE_CONSTR(stg_DEAD_WEAK,0,4,0,CONSTR,"DEAD_WEAK","DEAD_WEAK")
 437 { foreign "C" barf("DEAD_WEAK object entered!") never returns; }
 438
 439 /* ----------------------------------------------------------------------------
 440    NO_FINALIZER
 441
 442    This is a static nullary constructor (like []) that we use to mark an empty
 443    finalizer in a weak pointer object.
 444    ------------------------------------------------------------------------- */
 445
 446 INFO_TABLE_CONSTR(stg_NO_FINALIZER,0,0,0,CONSTR_NOCAF_STATIC,"NO_FINALIZER","NO_FINALIZER")
 447 { foreign "C" barf("NO_FINALIZER object entered!") never returns; }
 448
 449 CLOSURE(stg_NO_FINALIZER_closure,stg_NO_FINALIZER);
 450
 451 /* ----------------------------------------------------------------------------
 452    Stable Names are unlifted too.
 453    ------------------------------------------------------------------------- */
 454
 455 INFO_TABLE(stg_STABLE_NAME,0,1,STABLE_NAME,"STABLE_NAME","STABLE_NAME")
 456 { foreign "C" barf("STABLE_NAME object entered!") never returns; }
 457
 458 /* ----------------------------------------------------------------------------
 459    MVars
 460
 461    There are two kinds of these: full and empty.  We need an info table
 462    and entry code for each type.
 463    ------------------------------------------------------------------------- */
 464
 465 INFO_TABLE(stg_MVAR_CLEAN,3,0,MVAR_CLEAN,"MVAR","MVAR")
 466 { foreign "C" barf("MVAR object entered!") never returns; }
 467
 468 INFO_TABLE(stg_MVAR_DIRTY,3,0,MVAR_DIRTY,"MVAR","MVAR")
 469 { foreign "C" barf("MVAR object entered!") never returns; }
 470
 471 /* -----------------------------------------------------------------------------
 472    STM
 473    -------------------------------------------------------------------------- */
 474
 475 INFO_TABLE(stg_TVAR, 0, 0, TVAR, "TVAR", "TVAR")
 476 { foreign "C" barf("TVAR object entered!") never returns; }
 477
 478 INFO_TABLE(stg_TVAR_WATCH_QUEUE, 0, 0, TVAR_WATCH_QUEUE, "TVAR_WATCH_QUEUE", "TVAR_WATCH_QUEUE")
 479 { foreign "C" barf("TVAR_WATCH_QUEUE object entered!") never returns; }
 480
 481 INFO_TABLE(stg_ATOMIC_INVARIANT, 0, 0, ATOMIC_INVARIANT, "ATOMIC_INVARIANT", "ATOMIC_INVARIANT")
 482 { foreign "C" barf("ATOMIC_INVARIANT object entered!") never returns; }
 483
 484 INFO_TABLE(stg_INVARIANT_CHECK_QUEUE, 0, 0, INVARIANT_CHECK_QUEUE, "INVARIANT_CHECK_QUEUE", "INVARIANT_CHECK_QUEUE")
 485 { foreign "C" barf("INVARIANT_CHECK_QUEUE object entered!") never returns; }
 486
 487 INFO_TABLE(stg_TREC_CHUNK, 0, 0, TREC_CHUNK, "TREC_CHUNK", "TREC_CHUNK")
 488 { foreign "C" barf("TREC_CHUNK object entered!") never returns; }
 489
 490 INFO_TABLE(stg_TREC_HEADER, 0, 0, TREC_HEADER, "TREC_HEADER", "TREC_HEADER")
 491 { foreign "C" barf("TREC_HEADER object entered!") never returns; }
 492
 493 INFO_TABLE_CONSTR(stg_END_STM_WATCH_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_STM_WATCH_QUEUE","END_STM_WATCH_QUEUE")
 494 { foreign "C" barf("END_STM_WATCH_QUEUE object entered!") never returns; }
 495
 496 INFO_TABLE_CONSTR(stg_END_INVARIANT_CHECK_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_INVARIANT_CHECK_QUEUE","END_INVARIANT_CHECK_QUEUE")
 497 { foreign "C" barf("END_INVARIANT_CHECK_QUEUE object entered!") never returns; }
 498
 499 INFO_TABLE_CONSTR(stg_END_STM_CHUNK_LIST,0,0,0,CONSTR_NOCAF_STATIC,"END_STM_CHUNK_LIST","END_STM_CHUNK_LIST")
 500 { foreign "C" barf("END_STM_CHUNK_LIST object entered!") never returns; }
 501
 502 INFO_TABLE_CONSTR(stg_NO_TREC,0,0,0,CONSTR_NOCAF_STATIC,"NO_TREC","NO_TREC")
 503 { foreign "C" barf("NO_TREC object entered!") never returns; }
 504
 505 CLOSURE(stg_END_STM_WATCH_QUEUE_closure,stg_END_STM_WATCH_QUEUE);
 506
 507 CLOSURE(stg_END_INVARIANT_CHECK_QUEUE_closure,stg_END_INVARIANT_CHECK_QUEUE);
 508
 509 CLOSURE(stg_END_STM_CHUNK_LIST_closure,stg_END_STM_CHUNK_LIST);
 510
 511 CLOSURE(stg_NO_TREC_closure,stg_NO_TREC);
 512
 513 /* ----------------------------------------------------------------------------
 514    END_TSO_QUEUE
 515
 516    This is a static nullary constructor (like []) that we use to mark the
 517    end of a linked TSO queue.
 518    ------------------------------------------------------------------------- */
 519
 520 INFO_TABLE_CONSTR(stg_END_TSO_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_TSO_QUEUE","END_TSO_QUEUE")
 521 { foreign "C" barf("END_TSO_QUEUE object entered!") never returns; }
 522
 523 CLOSURE(stg_END_TSO_QUEUE_closure,stg_END_TSO_QUEUE);
 524
 525 /* ----------------------------------------------------------------------------
 526    Exception lists
 527    ------------------------------------------------------------------------- */
 528
 529 INFO_TABLE_CONSTR(stg_END_EXCEPTION_LIST,0,0,0,CONSTR_NOCAF_STATIC,"END_EXCEPTION_LIST","END_EXCEPTION_LIST")
 530 { foreign "C" barf("END_EXCEPTION_LIST object entered!") never returns; }
 531
 532 CLOSURE(stg_END_EXCEPTION_LIST_closure,stg_END_EXCEPTION_LIST);
 533
 534 INFO_TABLE(stg_EXCEPTION_CONS,1,1,CONSTR,"EXCEPTION_CONS","EXCEPTION_CONS")
 535 { foreign "C" barf("EXCEPTION_CONS object entered!") never returns; }
 536
 537 /* ----------------------------------------------------------------------------
 538    Arrays
 539
 540    These come in two basic flavours: arrays of data (StgArrWords) and arrays of
 541    pointers (StgArrPtrs).  They all have a similar layout:
 542
 543         ___________________________
 544         | Info | No. of | data....
 545         |  Ptr | Words  |
 546         ---------------------------
 547
 548    These are *unpointed* objects: i.e. they cannot be entered.
 549
 550    ------------------------------------------------------------------------- */
 551
 552 INFO_TABLE(stg_ARR_WORDS, 0, 0, ARR_WORDS, "ARR_WORDS", "ARR_WORDS")
 553 { foreign "C" barf("ARR_WORDS object entered!") never returns; }
 554
 555 INFO_TABLE(stg_MUT_ARR_PTRS_CLEAN, 0, 0, MUT_ARR_PTRS_CLEAN, "MUT_ARR_PTRS_CLEAN", "MUT_ARR_PTRS_CLEAN")
 556 { foreign "C" barf("MUT_ARR_PTRS_CLEAN object entered!") never returns; }
 557
 558 INFO_TABLE(stg_MUT_ARR_PTRS_DIRTY, 0, 0, MUT_ARR_PTRS_DIRTY, "MUT_ARR_PTRS_DIRTY", "MUT_ARR_PTRS_DIRTY")
 559 { foreign "C" barf("MUT_ARR_PTRS_DIRTY object entered!") never returns; }
 560
 561 INFO_TABLE(stg_MUT_ARR_PTRS_FROZEN, 0, 0, MUT_ARR_PTRS_FROZEN, "MUT_ARR_PTRS_FROZEN", "MUT_ARR_PTRS_FROZEN")
 562 { foreign "C" barf("MUT_ARR_PTRS_FROZEN object entered!") never returns; }
 563
 564 INFO_TABLE(stg_MUT_ARR_PTRS_FROZEN0, 0, 0, MUT_ARR_PTRS_FROZEN0, "MUT_ARR_PTRS_FROZEN0", "MUT_ARR_PTRS_FROZEN0")
 565 { foreign "C" barf("MUT_ARR_PTRS_FROZEN0 object entered!") never returns; }
 566
 567 /* ----------------------------------------------------------------------------
 568    Mutable Variables
 569    ------------------------------------------------------------------------- */
 570
 571 INFO_TABLE(stg_MUT_VAR_CLEAN, 1, 0, MUT_VAR_CLEAN, "MUT_VAR_CLEAN", "MUT_VAR_CLEAN")
 572 { foreign "C" barf("MUT_VAR_CLEAN object entered!") never returns; }
 573 INFO_TABLE(stg_MUT_VAR_DIRTY, 1, 0, MUT_VAR_DIRTY, "MUT_VAR_DIRTY", "MUT_VAR_DIRTY")
 574 { foreign "C" barf("MUT_VAR_DIRTY object entered!") never returns; }
 575
 576 /* ----------------------------------------------------------------------------
 577    Dummy return closure
 578
 579    Entering this closure will just return to the address on the top of the
 580    stack.  Useful for getting a thread in a canonical form where we can
 581    just enter the top stack word to start the thread.  (see deleteThread)
 582  * ------------------------------------------------------------------------- */
 583
 584 INFO_TABLE( stg_dummy_ret, 0, 0, CONSTR_NOCAF_STATIC, "DUMMY_RET", "DUMMY_RET")
 585 {
 586   jump %ENTRY_CODE(Sp(0));
 587 }
 588 CLOSURE(stg_dummy_ret_closure,stg_dummy_ret);
 589
 590 /* ----------------------------------------------------------------------------
 591    CHARLIKE and INTLIKE closures.
 592
 593    These are static representations of Chars and small Ints, so that
 594    we can remove dynamic Chars and Ints during garbage collection and
 595    replace them with references to the static objects.
 596    ------------------------------------------------------------------------- */
 597
 598 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
 599 /*
 600  * When sticking the RTS in a DLL, we delay populating the
 601  * Charlike and Intlike tables until load-time, which is only
 602  * when we've got the real addresses to the C# and I# closures.
 603  *
 604  */
 605 #warning Is this correct? _imp is a pointer!
 606 #define Char_hash_static_info _imp__base_GHCziBase_Czh_static_info
 607 #define Int_hash_static_info _imp__base_GHCziBase_Izh_static_info
 608 #else
 609 #define Char_hash_static_info base_GHCziBase_Czh_static_info
 610 #define Int_hash_static_info base_GHCziBase_Izh_static_info
 611 #endif
 612
 613
 614 #define CHARLIKE_HDR(n)  CLOSURE(Char_hash_static_info, n)
 615 #define INTLIKE_HDR(n)   CLOSURE(Int_hash_static_info, n)
 616
 617 /* put these in the *data* section, since the garbage collector relies
 618  * on the fact that static closures live in the data section.
 619  */
 620
 621 /* end the name with _closure, to convince the mangler this is a closure */
 622
 623 section "data" {
 624  stg_CHARLIKE_closure:
 625     CHARLIKE_HDR(0)
 626     CHARLIKE_HDR(1)
 627     CHARLIKE_HDR(2)
 628     CHARLIKE_HDR(3)
 629     CHARLIKE_HDR(4)
 630     CHARLIKE_HDR(5)
 631     CHARLIKE_HDR(6)
 632     CHARLIKE_HDR(7)
 633     CHARLIKE_HDR(8)
 634     CHARLIKE_HDR(9)
 635     CHARLIKE_HDR(10)
 636     CHARLIKE_HDR(11)
 637     CHARLIKE_HDR(12)
 638     CHARLIKE_HDR(13)
 639     CHARLIKE_HDR(14)
 640     CHARLIKE_HDR(15)
 641     CHARLIKE_HDR(16)
 642     CHARLIKE_HDR(17)
 643     CHARLIKE_HDR(18)
 644     CHARLIKE_HDR(19)
 645     CHARLIKE_HDR(20)
 646     CHARLIKE_HDR(21)
 647     CHARLIKE_HDR(22)
 648     CHARLIKE_HDR(23)
 649     CHARLIKE_HDR(24)
 650     CHARLIKE_HDR(25)
 651     CHARLIKE_HDR(26)
 652     CHARLIKE_HDR(27)
 653     CHARLIKE_HDR(28)
 654     CHARLIKE_HDR(29)
 655     CHARLIKE_HDR(30)
 656     CHARLIKE_HDR(31)
 657     CHARLIKE_HDR(32)
 658     CHARLIKE_HDR(33)
 659     CHARLIKE_HDR(34)
 660     CHARLIKE_HDR(35)
 661     CHARLIKE_HDR(36)
 662     CHARLIKE_HDR(37)
 663     CHARLIKE_HDR(38)
 664     CHARLIKE_HDR(39)
 665     CHARLIKE_HDR(40)
 666     CHARLIKE_HDR(41)
 667     CHARLIKE_HDR(42)
 668     CHARLIKE_HDR(43)
 669     CHARLIKE_HDR(44)
 670     CHARLIKE_HDR(45)
 671     CHARLIKE_HDR(46)
 672     CHARLIKE_HDR(47)
 673     CHARLIKE_HDR(48)
 674     CHARLIKE_HDR(49)
 675     CHARLIKE_HDR(50)
 676     CHARLIKE_HDR(51)
 677     CHARLIKE_HDR(52)
 678     CHARLIKE_HDR(53)
 679     CHARLIKE_HDR(54)
 680     CHARLIKE_HDR(55)
 681     CHARLIKE_HDR(56)
 682     CHARLIKE_HDR(57)
 683     CHARLIKE_HDR(58)
 684     CHARLIKE_HDR(59)
 685     CHARLIKE_HDR(60)
 686     CHARLIKE_HDR(61)
 687     CHARLIKE_HDR(62)
 688     CHARLIKE_HDR(63)
 689     CHARLIKE_HDR(64)
 690     CHARLIKE_HDR(65)
 691     CHARLIKE_HDR(66)
 692     CHARLIKE_HDR(67)
 693     CHARLIKE_HDR(68)
 694     CHARLIKE_HDR(69)
 695     CHARLIKE_HDR(70)
 696     CHARLIKE_HDR(71)
 697     CHARLIKE_HDR(72)
 698     CHARLIKE_HDR(73)
 699     CHARLIKE_HDR(74)
 700     CHARLIKE_HDR(75)
 701     CHARLIKE_HDR(76)
 702     CHARLIKE_HDR(77)
 703     CHARLIKE_HDR(78)
 704     CHARLIKE_HDR(79)
 705     CHARLIKE_HDR(80)
 706     CHARLIKE_HDR(81)
 707     CHARLIKE_HDR(82)
 708     CHARLIKE_HDR(83)
 709     CHARLIKE_HDR(84)
 710     CHARLIKE_HDR(85)
 711     CHARLIKE_HDR(86)
 712     CHARLIKE_HDR(87)
 713     CHARLIKE_HDR(88)
 714     CHARLIKE_HDR(89)
 715     CHARLIKE_HDR(90)
 716     CHARLIKE_HDR(91)
 717     CHARLIKE_HDR(92)
 718     CHARLIKE_HDR(93)
 719     CHARLIKE_HDR(94)
 720     CHARLIKE_HDR(95)
 721     CHARLIKE_HDR(96)
 722     CHARLIKE_HDR(97)
 723     CHARLIKE_HDR(98)
 724     CHARLIKE_HDR(99)
 725     CHARLIKE_HDR(100)
 726     CHARLIKE_HDR(101)
 727     CHARLIKE_HDR(102)
 728     CHARLIKE_HDR(103)
 729     CHARLIKE_HDR(104)
 730     CHARLIKE_HDR(105)
 731     CHARLIKE_HDR(106)
 732     CHARLIKE_HDR(107)
 733     CHARLIKE_HDR(108)
 734     CHARLIKE_HDR(109)
 735     CHARLIKE_HDR(110)
 736     CHARLIKE_HDR(111)
 737     CHARLIKE_HDR(112)
 738     CHARLIKE_HDR(113)
 739     CHARLIKE_HDR(114)
 740     CHARLIKE_HDR(115)
 741     CHARLIKE_HDR(116)
 742     CHARLIKE_HDR(117)
 743     CHARLIKE_HDR(118)
 744     CHARLIKE_HDR(119)
 745     CHARLIKE_HDR(120)
 746     CHARLIKE_HDR(121)
 747     CHARLIKE_HDR(122)
 748     CHARLIKE_HDR(123)
 749     CHARLIKE_HDR(124)
 750     CHARLIKE_HDR(125)
 751     CHARLIKE_HDR(126)
 752     CHARLIKE_HDR(127)
 753     CHARLIKE_HDR(128)
 754     CHARLIKE_HDR(129)
 755     CHARLIKE_HDR(130)
 756     CHARLIKE_HDR(131)
 757     CHARLIKE_HDR(132)
 758     CHARLIKE_HDR(133)
 759     CHARLIKE_HDR(134)
 760     CHARLIKE_HDR(135)
 761     CHARLIKE_HDR(136)
 762     CHARLIKE_HDR(137)
 763     CHARLIKE_HDR(138)
 764     CHARLIKE_HDR(139)
 765     CHARLIKE_HDR(140)
 766     CHARLIKE_HDR(141)
 767     CHARLIKE_HDR(142)
 768     CHARLIKE_HDR(143)
 769     CHARLIKE_HDR(144)
 770     CHARLIKE_HDR(145)
 771     CHARLIKE_HDR(146)
 772     CHARLIKE_HDR(147)
 773     CHARLIKE_HDR(148)
 774     CHARLIKE_HDR(149)
 775     CHARLIKE_HDR(150)
 776     CHARLIKE_HDR(151)
 777     CHARLIKE_HDR(152)
 778     CHARLIKE_HDR(153)
 779     CHARLIKE_HDR(154)
 780     CHARLIKE_HDR(155)
 781     CHARLIKE_HDR(156)
 782     CHARLIKE_HDR(157)
 783     CHARLIKE_HDR(158)
 784     CHARLIKE_HDR(159)
 785     CHARLIKE_HDR(160)
 786     CHARLIKE_HDR(161)
 787     CHARLIKE_HDR(162)
 788     CHARLIKE_HDR(163)
 789     CHARLIKE_HDR(164)
 790     CHARLIKE_HDR(165)
 791     CHARLIKE_HDR(166)
 792     CHARLIKE_HDR(167)
 793     CHARLIKE_HDR(168)
 794     CHARLIKE_HDR(169)
 795     CHARLIKE_HDR(170)
 796     CHARLIKE_HDR(171)
 797     CHARLIKE_HDR(172)
 798     CHARLIKE_HDR(173)
 799     CHARLIKE_HDR(174)
 800     CHARLIKE_HDR(175)
 801     CHARLIKE_HDR(176)
 802     CHARLIKE_HDR(177)
 803     CHARLIKE_HDR(178)
 804     CHARLIKE_HDR(179)
 805     CHARLIKE_HDR(180)
 806     CHARLIKE_HDR(181)
 807     CHARLIKE_HDR(182)
 808     CHARLIKE_HDR(183)
 809     CHARLIKE_HDR(184)
 810     CHARLIKE_HDR(185)
 811     CHARLIKE_HDR(186)
 812     CHARLIKE_HDR(187)
 813     CHARLIKE_HDR(188)
 814     CHARLIKE_HDR(189)
 815     CHARLIKE_HDR(190)
 816     CHARLIKE_HDR(191)
 817     CHARLIKE_HDR(192)
 818     CHARLIKE_HDR(193)
 819     CHARLIKE_HDR(194)
 820     CHARLIKE_HDR(195)
 821     CHARLIKE_HDR(196)
 822     CHARLIKE_HDR(197)
 823     CHARLIKE_HDR(198)
 824     CHARLIKE_HDR(199)
 825     CHARLIKE_HDR(200)
 826     CHARLIKE_HDR(201)
 827     CHARLIKE_HDR(202)
 828     CHARLIKE_HDR(203)
 829     CHARLIKE_HDR(204)
 830     CHARLIKE_HDR(205)
 831     CHARLIKE_HDR(206)
 832     CHARLIKE_HDR(207)
 833     CHARLIKE_HDR(208)
 834     CHARLIKE_HDR(209)
 835     CHARLIKE_HDR(210)
 836     CHARLIKE_HDR(211)
 837     CHARLIKE_HDR(212)
 838     CHARLIKE_HDR(213)
 839     CHARLIKE_HDR(214)
 840     CHARLIKE_HDR(215)
 841     CHARLIKE_HDR(216)
 842     CHARLIKE_HDR(217)
 843     CHARLIKE_HDR(218)
 844     CHARLIKE_HDR(219)
 845     CHARLIKE_HDR(220)
 846     CHARLIKE_HDR(221)
 847     CHARLIKE_HDR(222)
 848     CHARLIKE_HDR(223)
 849     CHARLIKE_HDR(224)
 850     CHARLIKE_HDR(225)
 851     CHARLIKE_HDR(226)
 852     CHARLIKE_HDR(227)
 853     CHARLIKE_HDR(228)
 854     CHARLIKE_HDR(229)
 855     CHARLIKE_HDR(230)
 856     CHARLIKE_HDR(231)
 857     CHARLIKE_HDR(232)
 858     CHARLIKE_HDR(233)
 859     CHARLIKE_HDR(234)
 860     CHARLIKE_HDR(235)
 861     CHARLIKE_HDR(236)
 862     CHARLIKE_HDR(237)
 863     CHARLIKE_HDR(238)
 864     CHARLIKE_HDR(239)
 865     CHARLIKE_HDR(240)
 866     CHARLIKE_HDR(241)
 867     CHARLIKE_HDR(242)
 868     CHARLIKE_HDR(243)
 869     CHARLIKE_HDR(244)
 870     CHARLIKE_HDR(245)
 871     CHARLIKE_HDR(246)
 872     CHARLIKE_HDR(247)
 873     CHARLIKE_HDR(248)
 874     CHARLIKE_HDR(249)
 875     CHARLIKE_HDR(250)
 876     CHARLIKE_HDR(251)
 877     CHARLIKE_HDR(252)
 878     CHARLIKE_HDR(253)
 879     CHARLIKE_HDR(254)
 880     CHARLIKE_HDR(255)
 881 }
 882
 883 section "data" {
 884  stg_INTLIKE_closure:
 885     INTLIKE_HDR(-16)    /* MIN_INTLIKE == -16 */
 886     INTLIKE_HDR(-15)
 887     INTLIKE_HDR(-14)
 888     INTLIKE_HDR(-13)
 889     INTLIKE_HDR(-12)
 890     INTLIKE_HDR(-11)
 891     INTLIKE_HDR(-10)
 892     INTLIKE_HDR(-9)
 893     INTLIKE_HDR(-8)
 894     INTLIKE_HDR(-7)
 895     INTLIKE_HDR(-6)
 896     INTLIKE_HDR(-5)
 897     INTLIKE_HDR(-4)
 898     INTLIKE_HDR(-3)
 899     INTLIKE_HDR(-2)
 900     INTLIKE_HDR(-1)
 901     INTLIKE_HDR(0)
 902     INTLIKE_HDR(1)
 903     INTLIKE_HDR(2)
 904     INTLIKE_HDR(3)
 905     INTLIKE_HDR(4)
 906     INTLIKE_HDR(5)
 907     INTLIKE_HDR(6)
 908     INTLIKE_HDR(7)
 909     INTLIKE_HDR(8)
 910     INTLIKE_HDR(9)
 911     INTLIKE_HDR(10)
 912     INTLIKE_HDR(11)
 913     INTLIKE_HDR(12)
 914     INTLIKE_HDR(13)
 915     INTLIKE_HDR(14)
 916     INTLIKE_HDR(15)
 917     INTLIKE_HDR(16)     /* MAX_INTLIKE == 16 */
 918 }