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
  19 /* ----------------------------------------------------------------------------
  20    Support for the bytecode interpreter.
  21    ------------------------------------------------------------------------- */
  22
  23 /* 9 bits of return code for constructors created by the interpreter. */
  24 stg_interp_constr_entry
  25 {
  26     /* R1 points at the constructor */
  27     jump %ENTRY_CODE(Sp(0));
  28 }
  29
  30 /* Some info tables to be used when compiled code returns a value to
  31    the interpreter, i.e. the interpreter pushes one of these onto the
  32    stack before entering a value.  What the code does is to
  33    impedance-match the compiled return convention (in R1p/R1n/F1/D1 etc) to
  34    the interpreter's convention (returned value is on top of stack),
  35    and then cause the scheduler to enter the interpreter.
  36
  37    On entry, the stack (growing down) looks like this:
  38
  39       ptr to BCO holding return continuation
  40       ptr to one of these info tables.
  41
  42    The info table code, both direct and vectored, must:
  43       * push R1/F1/D1 on the stack, and its tag if necessary
  44       * push the BCO (so it's now on the stack twice)
  45       * Yield, ie, go to the scheduler.
  46
  47    Scheduler examines the t.o.s, discovers it is a BCO, and proceeds
  48    directly to the bytecode interpreter.  That pops the top element
  49    (the BCO, containing the return continuation), and interprets it.
  50    Net result: return continuation gets interpreted, with the
  51    following stack:
  52
  53       ptr to this BCO
  54       ptr to the info table just jumped thru
  55       return value
  56
  57    which is just what we want -- the "standard" return layout for the
  58    interpreter.  Hurrah!
  59
  60    Don't ask me how unboxed tuple returns are supposed to work.  We
  61    haven't got a good story about that yet.
  62 */
  63
  64 INFO_TABLE_RET( stg_ctoi_R1p, RET_BCO)
  65 {
  66     Sp_adj(-2);
  67     Sp(1) = R1;
  68     Sp(0) = stg_enter_info;
  69     jump stg_yield_to_interpreter;
  70 }
  71
  72 /*
  73  * When the returned value is a pointer, but unlifted, in R1 ...
  74  */
  75 INFO_TABLE_RET( stg_ctoi_R1unpt, RET_BCO )
  76 {
  77     Sp_adj(-2);
  78     Sp(1) = R1;
  79     Sp(0) = stg_gc_unpt_r1_info;
  80     jump stg_yield_to_interpreter;
  81 }
  82
  83 /*
  84  * When the returned value is a non-pointer in R1 ...
  85  */
  86 INFO_TABLE_RET( stg_ctoi_R1n, RET_BCO )
  87 {
  88     Sp_adj(-2);
  89     Sp(1) = R1;
  90     Sp(0) = stg_gc_unbx_r1_info;
  91     jump stg_yield_to_interpreter;
  92 }
  93
  94 /*
  95  * When the returned value is in F1
  96  */
  97 INFO_TABLE_RET( stg_ctoi_F1, RET_BCO )
  98 {
  99     Sp_adj(-2);
 100     F_[Sp + WDS(1)] = F1;
 101     Sp(0) = stg_gc_f1_info;
 102     jump stg_yield_to_interpreter;
 103 }
 104
 105 /*
 106  * When the returned value is in D1
 107  */
 108 INFO_TABLE_RET( stg_ctoi_D1, RET_BCO )
 109 {
 110     Sp_adj(-1) - SIZEOF_DOUBLE;
 111     D_[Sp + WDS(1)] = D1;
 112     Sp(0) = stg_gc_d1_info;
 113     jump stg_yield_to_interpreter;
 114 }
 115
 116 /*
 117  * When the returned value is in L1
 118  */
 119 INFO_TABLE_RET( stg_ctoi_L1, RET_BCO )
 120 {
 121     Sp_adj(-1) - 8;
 122     L_[Sp + WDS(1)] = L1;
 123     Sp(0) = stg_gc_l1_info;
 124     jump stg_yield_to_interpreter;
 125 }
 126
 127 /*
 128  * When the returned value is a void
 129  */
 130 INFO_TABLE_RET( stg_ctoi_V, RET_BCO )
 131 {
 132     Sp_adj(-1);
 133     Sp(0) = stg_gc_void_info;
 134     jump stg_yield_to_interpreter;
 135 }
 136
 137 /*
 138  * Dummy info table pushed on the top of the stack when the interpreter
 139  * should apply the BCO on the stack to its arguments, also on the
 140  * stack.
 141  */
 142 INFO_TABLE_RET( stg_apply_interp, RET_BCO )
 143 {
 144     /* Just in case we end up in here... (we shouldn't) */
 145     jump stg_yield_to_interpreter;
 146 }
 147
 148 /* ----------------------------------------------------------------------------
 149    Entry code for a BCO
 150    ------------------------------------------------------------------------- */
 151
 152 INFO_TABLE_FUN( stg_BCO, 4, 0, BCO, "BCO", "BCO", ARG_BCO )
 153 {
 154   /* entering a BCO means "apply it", same as a function */
 155   Sp_adj(-2);
 156   Sp(1) = R1;
 157   Sp(0) = stg_apply_interp_info;
 158   jump stg_yield_to_interpreter;
 159 }
 160
 161 /* ----------------------------------------------------------------------------
 162    Info tables for indirections.
 163
 164    SPECIALISED INDIRECTIONS: we have a specialised indirection for direct returns,
 165    so that we can avoid entering
 166    the object when we know it points directly to a value.  The update
 167    code (Updates.cmm) updates objects with the appropriate kind of
 168    indirection.  We only do this for young-gen indirections.
 169    ------------------------------------------------------------------------- */
 170
 171 INFO_TABLE(stg_IND,1,0,IND,"IND","IND")
 172 {
 173     TICK_ENT_DYN_IND(); /* tick */
 174     R1 = UNTAG(StgInd_indirectee(R1));
 175     TICK_ENT_VIA_NODE();
 176     jump %GET_ENTRY(R1);
 177 }
 178
 179 INFO_TABLE(stg_IND_direct,1,0,IND,"IND","IND")
 180 {
 181     TICK_ENT_DYN_IND(); /* tick */
 182     R1 = StgInd_indirectee(R1);
 183     TICK_ENT_VIA_NODE();
 184     jump %ENTRY_CODE(Sp(0));
 185 }
 186
 187 INFO_TABLE(stg_IND_STATIC,1,0,IND_STATIC,"IND_STATIC","IND_STATIC")
 188 {
 189     TICK_ENT_STATIC_IND();      /* tick */
 190     R1 = UNTAG(StgInd_indirectee(R1));
 191     TICK_ENT_VIA_NODE();
 192     jump %GET_ENTRY(R1);
 193 }
 194
 195 INFO_TABLE(stg_IND_PERM,1,0,IND_PERM,"IND_PERM","IND_PERM")
 196 {
 197     /* Don't add INDs to granularity cost */
 198
 199     /* Don't: TICK_ENT_STATIC_IND(Node); for ticky-ticky; this ind is
 200        here only to help profiling */
 201
 202 #if defined(TICKY_TICKY) && !defined(PROFILING)
 203     /* TICKY_TICKY && !PROFILING means PERM_IND *replaces* an IND, rather than
 204        being extra  */
 205     TICK_ENT_PERM_IND();
 206 #endif
 207
 208     LDV_ENTER(R1);
 209
 210     /* Enter PAP cost centre */
 211     ENTER_CCS_PAP_CL(R1);
 212
 213     /* For ticky-ticky, change the perm_ind to a normal ind on first
 214      * entry, so the number of ent_perm_inds is the number of *thunks*
 215      * entered again, not the number of subsequent entries.
 216      *
 217      * Since this screws up cost centres, we die if profiling and
 218      * ticky_ticky are on at the same time.  KSW 1999-01.
 219      */
 220 #ifdef TICKY_TICKY
 221 #  ifdef PROFILING
 222 #    error Profiling and ticky-ticky do not mix at present!
 223 #  endif  /* PROFILING */
 224     StgHeader_info(R1) = stg_IND_info;
 225 #endif /* TICKY_TICKY */
 226
 227     R1 = UNTAG(StgInd_indirectee(R1));
 228
 229 #if defined(TICKY_TICKY) && !defined(PROFILING)
 230     TICK_ENT_VIA_NODE();
 231 #endif
 232
 233     jump %GET_ENTRY(R1);
 234 }
 235
 236
 237 INFO_TABLE(stg_IND_OLDGEN,1,0,IND_OLDGEN,"IND_OLDGEN","IND_OLDGEN")
 238 {
 239     TICK_ENT_STATIC_IND();      /* tick */
 240     R1 = UNTAG(StgInd_indirectee(R1));
 241     TICK_ENT_VIA_NODE();
 242     jump %GET_ENTRY(R1);
 243 }
 244
 245 INFO_TABLE(stg_IND_OLDGEN_PERM,1,0,IND_OLDGEN_PERM,"IND_OLDGEN_PERM","IND_OLDGEN_PERM")
 246 {
 247     /* Don't: TICK_ENT_STATIC_IND(Node); for ticky-ticky;
 248        this ind is here only to help profiling */
 249
 250 #if defined(TICKY_TICKY) && !defined(PROFILING)
 251     /* TICKY_TICKY && !PROFILING means PERM_IND *replaces* an IND,
 252        rather than being extra  */
 253     TICK_ENT_PERM_IND(); /* tick */
 254 #endif
 255
 256     LDV_ENTER(R1);
 257
 258     /* Enter PAP cost centre -- lexical scoping only */
 259     ENTER_CCS_PAP_CL(R1);
 260
 261     /* see comment in IND_PERM */
 262 #ifdef TICKY_TICKY
 263 #  ifdef PROFILING
 264 #    error Profiling and ticky-ticky do not mix at present!
 265 #  endif  /* PROFILING */
 266     StgHeader_info(R1) = stg_IND_OLDGEN_info;
 267 #endif /* TICKY_TICKY */
 268
 269     R1 = UNTAG(StgInd_indirectee(R1));
 270
 271     TICK_ENT_VIA_NODE();
 272     jump %GET_ENTRY(R1);
 273 }
 274
 275 /* ----------------------------------------------------------------------------
 276    Black holes.
 277
 278    Entering a black hole normally causes a cyclic data dependency, but
 279    in the concurrent world, black holes are synchronization points,
 280    and they are turned into blocking queues when there are threads
 281    waiting for the evaluation of the closure to finish.
 282    ------------------------------------------------------------------------- */
 283
 284 /* Note: a BLACKHOLE must be big enough to be
 285  * overwritten with an indirection/evacuee/catch.  Thus we claim it
 286  * has 1 non-pointer word of payload.
 287  */
 288 INFO_TABLE(stg_BLACKHOLE,0,1,BLACKHOLE,"BLACKHOLE","BLACKHOLE")
 289 {
 290 #if defined(GRAN)
 291     /* Before overwriting TSO_LINK */
 292     STGCALL3(GranSimBlock,CurrentTSO,CurrentProc,(StgClosure *)R1 /*Node*/);
 293 #endif
 294
 295     TICK_ENT_BH();
 296
 297 #ifdef THREADED_RTS
 298     // foreign "C" debugBelch("BLACKHOLE entry\n");
 299 #endif
 300
 301     /* Actually this is not necessary because R1 is about to be destroyed. */
 302     LDV_ENTER(R1);
 303
 304 #if defined(THREADED_RTS)
 305     foreign "C" ACQUIRE_LOCK(sched_mutex "ptr");
 306     // released in stg_block_blackhole_finally
 307 #endif
 308
 309     /* Put ourselves on the blackhole queue */
 310     StgTSO_link(CurrentTSO) = W_[blackhole_queue];
 311     W_[blackhole_queue] = CurrentTSO;
 312
 313     /* jot down why and on what closure we are blocked */
 314     StgTSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
 315     StgTSO_block_info(CurrentTSO) = R1;
 316
 317     jump stg_block_blackhole;
 318 }
 319
 320 #if defined(PAR) || defined(GRAN)
 321
 322 INFO_TABLE(stg_RBH,1,1,RBH,"RBH","RBH")
 323 {
 324 # if defined(GRAN)
 325     /* mainly statistics gathering for GranSim simulation */
 326     STGCALL3(GranSimBlock,CurrentTSO,CurrentProc,(StgClosure *)R1 /*Node*/);
 327 # endif
 328
 329     /* exactly the same as a BLACKHOLE_BQ_entry -- HWL */
 330     /* Put ourselves on the blocking queue for this black hole */
 331     TSO_link(CurrentTSO) = StgBlockingQueue_blocking_queue(R1);
 332     StgBlockingQueue_blocking_queue(R1) = CurrentTSO;
 333     /* jot down why and on what closure we are blocked */
 334     TSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
 335     TSO_block_info(CurrentTSO) = R1;
 336
 337     /* PAR: dumping of event now done in blockThread -- HWL */
 338
 339     /* stg_gen_block is too heavyweight, use a specialised one */
 340     jump stg_block_1;
 341 }
 342
 343 INFO_TABLE(stg_RBH_Save_0,0,2,CONSTR,"RBH_Save_0","RBH_Save_0")
 344 { foreign "C" barf("RBH_Save_0 object entered!"); }
 345
 346 INFO_TABLE(stg_RBH_Save_1,1,1,CONSTR,"RBH_Save_1","RBH_Save_1");
 347 { foreign "C" barf("RBH_Save_1 object entered!"); }
 348
 349 INFO_TABLE(stg_RBH_Save_2,2,0,CONSTR,"RBH_Save_2","RBH_Save_2");
 350 { foreign "C" barf("RBH_Save_2 object entered!"); }
 351
 352 #endif /* defined(PAR) || defined(GRAN) */
 353
 354 /* identical to BLACKHOLEs except for the infotag */
 355 INFO_TABLE(stg_CAF_BLACKHOLE,0,1,CAF_BLACKHOLE,"CAF_BLACKHOLE","CAF_BLACKHOLE")
 356 {
 357 #if defined(GRAN)
 358     /* mainly statistics gathering for GranSim simulation */
 359     STGCALL3(GranSimBlock,CurrentTSO,CurrentProc,(StgClosure *)R1 /*Node*/);
 360 #endif
 361
 362     TICK_ENT_BH();
 363     LDV_ENTER(R1);
 364
 365 #if defined(THREADED_RTS)
 366     // foreign "C" debugBelch("BLACKHOLE entry\n");
 367 #endif
 368
 369 #if defined(THREADED_RTS)
 370     foreign "C" ACQUIRE_LOCK(sched_mutex "ptr");
 371     // released in stg_block_blackhole_finally
 372 #endif
 373
 374     /* Put ourselves on the blackhole queue */
 375     StgTSO_link(CurrentTSO) = W_[blackhole_queue];
 376     W_[blackhole_queue] = CurrentTSO;
 377
 378     /* jot down why and on what closure we are blocked */
 379     StgTSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
 380     StgTSO_block_info(CurrentTSO) = R1;
 381
 382     jump stg_block_blackhole;
 383 }
 384
 385 #ifdef EAGER_BLACKHOLING
 386 INFO_TABLE(stg_SE_BLACKHOLE,0,1,SE_BLACKHOLE,"SE_BLACKHOLE","SE_BLACKHOLE")
 387 { foreign "C" barf("SE_BLACKHOLE object entered!"); }
 388
 389 INFO_TABLE(stg_SE_CAF_BLACKHOLE,0,1,SE_CAF_BLACKHOLE,"SE_CAF_BLACKHOLE","SE_CAF_BLACKHOLE")
 390 { foreign "C" barf("SE_CAF_BLACKHOLE object entered!"); }
 391 #endif
 392
 393 /* ----------------------------------------------------------------------------
 394    Whiteholes are used for the "locked" state of a closure (see lockClosure())
 395
 396    The closure type is BLAKCHOLE, just because we need a valid closure type
 397    for sanity checking.
 398    ------------------------------------------------------------------------- */
 399
 400 INFO_TABLE(stg_WHITEHOLE, 0,0, BLACKHOLE, "WHITEHOLE", "WHITEHOLE")
 401 { foreign "C" barf("WHITEHOLE object entered!"); }
 402
 403 /* ----------------------------------------------------------------------------
 404    Some static info tables for things that don't get entered, and
 405    therefore don't need entry code (i.e. boxed but unpointed objects)
 406    NON_ENTERABLE_ENTRY_CODE now defined at the beginning of the file
 407    ------------------------------------------------------------------------- */
 408
 409 INFO_TABLE(stg_TSO, 0,0,TSO, "TSO", "TSO")
 410 { foreign "C" barf("TSO object entered!"); }
 411
 412 /* ----------------------------------------------------------------------------
 413    Evacuees are left behind by the garbage collector.  Any attempt to enter
 414    one is a real bug.
 415    ------------------------------------------------------------------------- */
 416
 417 INFO_TABLE(stg_EVACUATED,1,0,EVACUATED,"EVACUATED","EVACUATED")
 418 { foreign "C" barf("EVACUATED object entered!"); }
 419
 420 /* ----------------------------------------------------------------------------
 421    Weak pointers
 422
 423    Live weak pointers have a special closure type.  Dead ones are just
 424    nullary constructors (although they live on the heap - we overwrite
 425    live weak pointers with dead ones).
 426    ------------------------------------------------------------------------- */
 427
 428 INFO_TABLE(stg_WEAK,0,4,WEAK,"WEAK","WEAK")
 429 { foreign "C" barf("WEAK object entered!"); }
 430
 431 /*
 432  * It's important when turning an existing WEAK into a DEAD_WEAK
 433  * (which is what finalizeWeak# does) that we don't lose the link
 434  * field and break the linked list of weak pointers.  Hence, we give
 435  * DEAD_WEAK 4 non-pointer fields, the same as WEAK.
 436  */
 437 INFO_TABLE_CONSTR(stg_DEAD_WEAK,0,4,0,CONSTR,"DEAD_WEAK","DEAD_WEAK")
 438 { foreign "C" barf("DEAD_WEAK object entered!"); }
 439
 440 /* ----------------------------------------------------------------------------
 441    NO_FINALIZER
 442
 443    This is a static nullary constructor (like []) that we use to mark an empty
 444    finalizer in a weak pointer object.
 445    ------------------------------------------------------------------------- */
 446
 447 INFO_TABLE_CONSTR(stg_NO_FINALIZER,0,0,0,CONSTR_NOCAF_STATIC,"NO_FINALIZER","NO_FINALIZER")
 448 { foreign "C" barf("NO_FINALIZER object entered!"); }
 449
 450 CLOSURE(stg_NO_FINALIZER_closure,stg_NO_FINALIZER);
 451
 452 /* ----------------------------------------------------------------------------
 453    Stable Names are unlifted too.
 454    ------------------------------------------------------------------------- */
 455
 456 INFO_TABLE(stg_STABLE_NAME,0,1,STABLE_NAME,"STABLE_NAME","STABLE_NAME")
 457 { foreign "C" barf("STABLE_NAME object entered!"); }
 458
 459 /* ----------------------------------------------------------------------------
 460    MVars
 461
 462    There are two kinds of these: full and empty.  We need an info table
 463    and entry code for each type.
 464    ------------------------------------------------------------------------- */
 465
 466 INFO_TABLE(stg_FULL_MVAR,3,0,MVAR,"MVAR","MVAR")
 467 { foreign "C" barf("FULL_MVAR object entered!"); }
 468
 469 INFO_TABLE(stg_EMPTY_MVAR,3,0,MVAR,"MVAR","MVAR")
 470 { foreign "C" barf("EMPTY_MVAR object entered!"); }
 471
 472 /* -----------------------------------------------------------------------------
 473    STM
 474    -------------------------------------------------------------------------- */
 475
 476 INFO_TABLE(stg_TVAR, 0, 0, TVAR, "TVAR", "TVAR")
 477 { foreign "C" barf("TVAR object entered!"); }
 478
 479 INFO_TABLE(stg_TVAR_WATCH_QUEUE, 0, 0, TVAR_WATCH_QUEUE, "TVAR_WATCH_QUEUE", "TVAR_WATCH_QUEUE")
 480 { foreign "C" barf("TVAR_WATCH_QUEUE object entered!"); }
 481
 482 INFO_TABLE(stg_ATOMIC_INVARIANT, 0, 0, ATOMIC_INVARIANT, "ATOMIC_INVARIANT", "ATOMIC_INVARIANT")
 483 { foreign "C" barf("ATOMIC_INVARIANT object entered!"); }
 484
 485 INFO_TABLE(stg_INVARIANT_CHECK_QUEUE, 0, 0, INVARIANT_CHECK_QUEUE, "INVARIANT_CHECK_QUEUE", "INVARIANT_CHECK_QUEUE")
 486 { foreign "C" barf("INVARIANT_CHECK_QUEUE object entered!"); }
 487
 488 INFO_TABLE(stg_TREC_CHUNK, 0, 0, TREC_CHUNK, "TREC_CHUNK", "TREC_CHUNK")
 489 { foreign "C" barf("TREC_CHUNK object entered!"); }
 490
 491 INFO_TABLE(stg_TREC_HEADER, 0, 0, TREC_HEADER, "TREC_HEADER", "TREC_HEADER")
 492 { foreign "C" barf("TREC_HEADER object entered!"); }
 493
 494 INFO_TABLE_CONSTR(stg_END_STM_WATCH_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_STM_WATCH_QUEUE","END_STM_WATCH_QUEUE")
 495 { foreign "C" barf("END_STM_WATCH_QUEUE object entered!"); }
 496
 497 INFO_TABLE_CONSTR(stg_END_INVARIANT_CHECK_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_INVARIANT_CHECK_QUEUE","END_INVARIANT_CHECK_QUEUE")
 498 { foreign "C" barf("END_INVARIANT_CHECK_QUEUE object entered!"); }
 499
 500 INFO_TABLE_CONSTR(stg_END_STM_CHUNK_LIST,0,0,0,CONSTR_NOCAF_STATIC,"END_STM_CHUNK_LIST","END_STM_CHUNK_LIST")
 501 { foreign "C" barf("END_STM_CHUNK_LIST object entered!"); }
 502
 503 INFO_TABLE_CONSTR(stg_NO_TREC,0,0,0,CONSTR_NOCAF_STATIC,"NO_TREC","NO_TREC")
 504 { foreign "C" barf("NO_TREC object entered!"); }
 505
 506 CLOSURE(stg_END_STM_WATCH_QUEUE_closure,stg_END_STM_WATCH_QUEUE);
 507
 508 CLOSURE(stg_END_INVARIANT_CHECK_QUEUE_closure,stg_END_INVARIANT_CHECK_QUEUE);
 509
 510 CLOSURE(stg_END_STM_CHUNK_LIST_closure,stg_END_STM_CHUNK_LIST);
 511
 512 CLOSURE(stg_NO_TREC_closure,stg_NO_TREC);
 513
 514 /* ----------------------------------------------------------------------------
 515    END_TSO_QUEUE
 516
 517    This is a static nullary constructor (like []) that we use to mark the
 518    end of a linked TSO queue.
 519    ------------------------------------------------------------------------- */
 520
 521 INFO_TABLE_CONSTR(stg_END_TSO_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_TSO_QUEUE","END_TSO_QUEUE")
 522 { foreign "C" barf("END_TSO_QUEUE object entered!"); }
 523
 524 CLOSURE(stg_END_TSO_QUEUE_closure,stg_END_TSO_QUEUE);
 525
 526 /* ----------------------------------------------------------------------------
 527    Exception lists
 528    ------------------------------------------------------------------------- */
 529
 530 INFO_TABLE_CONSTR(stg_END_EXCEPTION_LIST,0,0,0,CONSTR_NOCAF_STATIC,"END_EXCEPTION_LIST","END_EXCEPTION_LIST")
 531 { foreign "C" barf("END_EXCEPTION_LIST object entered!"); }
 532
 533 CLOSURE(stg_END_EXCEPTION_LIST_closure,stg_END_EXCEPTION_LIST);
 534
 535 INFO_TABLE(stg_EXCEPTION_CONS,1,1,CONSTR,"EXCEPTION_CONS","EXCEPTION_CONS")
 536 { foreign "C" barf("EXCEPTION_CONS object entered!"); }
 537
 538 /* ----------------------------------------------------------------------------
 539    Arrays
 540
 541    These come in two basic flavours: arrays of data (StgArrWords) and arrays of
 542    pointers (StgArrPtrs).  They all have a similar layout:
 543
 544         ___________________________
 545         | Info | No. of | data....
 546         |  Ptr | Words  |
 547         ---------------------------
 548
 549    These are *unpointed* objects: i.e. they cannot be entered.
 550
 551    ------------------------------------------------------------------------- */
 552
 553 INFO_TABLE(stg_ARR_WORDS, 0, 0, ARR_WORDS, "ARR_WORDS", "ARR_WORDS")
 554 { foreign "C" barf("ARR_WORDS object entered!"); }
 555
 556 INFO_TABLE(stg_MUT_ARR_PTRS_CLEAN, 0, 0, MUT_ARR_PTRS_CLEAN, "MUT_ARR_PTRS_CLEAN", "MUT_ARR_PTRS_CLEAN")
 557 { foreign "C" barf("MUT_ARR_PTRS_CLEAN object entered!"); }
 558
 559 INFO_TABLE(stg_MUT_ARR_PTRS_DIRTY, 0, 0, MUT_ARR_PTRS_DIRTY, "MUT_ARR_PTRS_DIRTY", "MUT_ARR_PTRS_DIRTY")
 560 { foreign "C" barf("MUT_ARR_PTRS_DIRTY object entered!"); }
 561
 562 INFO_TABLE(stg_MUT_ARR_PTRS_FROZEN, 0, 0, MUT_ARR_PTRS_FROZEN, "MUT_ARR_PTRS_FROZEN", "MUT_ARR_PTRS_FROZEN")
 563 { foreign "C" barf("MUT_ARR_PTRS_FROZEN object entered!"); }
 564
 565 INFO_TABLE(stg_MUT_ARR_PTRS_FROZEN0, 0, 0, MUT_ARR_PTRS_FROZEN0, "MUT_ARR_PTRS_FROZEN0", "MUT_ARR_PTRS_FROZEN0")
 566 { foreign "C" barf("MUT_ARR_PTRS_FROZEN0 object entered!"); }
 567
 568 /* ----------------------------------------------------------------------------
 569    Mutable Variables
 570    ------------------------------------------------------------------------- */
 571
 572 INFO_TABLE(stg_MUT_VAR_CLEAN, 1, 0, MUT_VAR_CLEAN, "MUT_VAR_CLEAN", "MUT_VAR_CLEAN")
 573 { foreign "C" barf("MUT_VAR_CLEAN object entered!"); }
 574 INFO_TABLE(stg_MUT_VAR_DIRTY, 1, 0, MUT_VAR_DIRTY, "MUT_VAR_DIRTY", "MUT_VAR_DIRTY")
 575 { foreign "C" barf("MUT_VAR_DIRTY object entered!"); }
 576
 577 /* ----------------------------------------------------------------------------
 578    Dummy return closure
 579
 580    Entering this closure will just return to the address on the top of the
 581    stack.  Useful for getting a thread in a canonical form where we can
 582    just enter the top stack word to start the thread.  (see deleteThread)
 583  * ------------------------------------------------------------------------- */
 584
 585 INFO_TABLE( stg_dummy_ret, 0, 0, CONSTR_NOCAF_STATIC, "DUMMY_RET", "DUMMY_RET")
 586 {
 587   jump %ENTRY_CODE(Sp(0));
 588 }
 589 CLOSURE(stg_dummy_ret_closure,stg_dummy_ret);
 590
 591 /* ----------------------------------------------------------------------------
 592    CHARLIKE and INTLIKE closures.
 593
 594    These are static representations of Chars and small Ints, so that
 595    we can remove dynamic Chars and Ints during garbage collection and
 596    replace them with references to the static objects.
 597    ------------------------------------------------------------------------- */
 598
 599 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
 600 /*
 601  * When sticking the RTS in a DLL, we delay populating the
 602  * Charlike and Intlike tables until load-time, which is only
 603  * when we've got the real addresses to the C# and I# closures.
 604  *
 605  */
 606 #warning Is this correct? _imp is a pointer!
 607 #define Char_hash_static_info _imp__base_GHCziBase_Czh_static
 608 #define Int_hash_static_info _imp__base_GHCziBase_Izh_static
 609 #else
 610 #define Char_hash_static_info base_GHCziBase_Czh_static
 611 #define Int_hash_static_info base_GHCziBase_Izh_static
 612 #endif
 613
 614
 615 #define CHARLIKE_HDR(n)  CLOSURE(Char_hash_static_info, n)
 616 #define INTLIKE_HDR(n)   CLOSURE(Int_hash_static_info, n)
 617
 618 /* put these in the *data* section, since the garbage collector relies
 619  * on the fact that static closures live in the data section.
 620  */
 621
 622 /* end the name with _closure, to convince the mangler this is a closure */
 623
 624 section "data" {
 625  stg_CHARLIKE_closure:
 626     CHARLIKE_HDR(0)
 627     CHARLIKE_HDR(1)
 628     CHARLIKE_HDR(2)
 629     CHARLIKE_HDR(3)
 630     CHARLIKE_HDR(4)
 631     CHARLIKE_HDR(5)
 632     CHARLIKE_HDR(6)
 633     CHARLIKE_HDR(7)
 634     CHARLIKE_HDR(8)
 635     CHARLIKE_HDR(9)
 636     CHARLIKE_HDR(10)
 637     CHARLIKE_HDR(11)
 638     CHARLIKE_HDR(12)
 639     CHARLIKE_HDR(13)
 640     CHARLIKE_HDR(14)
 641     CHARLIKE_HDR(15)
 642     CHARLIKE_HDR(16)
 643     CHARLIKE_HDR(17)
 644     CHARLIKE_HDR(18)
 645     CHARLIKE_HDR(19)
 646     CHARLIKE_HDR(20)
 647     CHARLIKE_HDR(21)
 648     CHARLIKE_HDR(22)
 649     CHARLIKE_HDR(23)
 650     CHARLIKE_HDR(24)
 651     CHARLIKE_HDR(25)
 652     CHARLIKE_HDR(26)
 653     CHARLIKE_HDR(27)
 654     CHARLIKE_HDR(28)
 655     CHARLIKE_HDR(29)
 656     CHARLIKE_HDR(30)
 657     CHARLIKE_HDR(31)
 658     CHARLIKE_HDR(32)
 659     CHARLIKE_HDR(33)
 660     CHARLIKE_HDR(34)
 661     CHARLIKE_HDR(35)
 662     CHARLIKE_HDR(36)
 663     CHARLIKE_HDR(37)
 664     CHARLIKE_HDR(38)
 665     CHARLIKE_HDR(39)
 666     CHARLIKE_HDR(40)
 667     CHARLIKE_HDR(41)
 668     CHARLIKE_HDR(42)
 669     CHARLIKE_HDR(43)
 670     CHARLIKE_HDR(44)
 671     CHARLIKE_HDR(45)
 672     CHARLIKE_HDR(46)
 673     CHARLIKE_HDR(47)
 674     CHARLIKE_HDR(48)
 675     CHARLIKE_HDR(49)
 676     CHARLIKE_HDR(50)
 677     CHARLIKE_HDR(51)
 678     CHARLIKE_HDR(52)
 679     CHARLIKE_HDR(53)
 680     CHARLIKE_HDR(54)
 681     CHARLIKE_HDR(55)
 682     CHARLIKE_HDR(56)
 683     CHARLIKE_HDR(57)
 684     CHARLIKE_HDR(58)
 685     CHARLIKE_HDR(59)
 686     CHARLIKE_HDR(60)
 687     CHARLIKE_HDR(61)
 688     CHARLIKE_HDR(62)
 689     CHARLIKE_HDR(63)
 690     CHARLIKE_HDR(64)
 691     CHARLIKE_HDR(65)
 692     CHARLIKE_HDR(66)
 693     CHARLIKE_HDR(67)
 694     CHARLIKE_HDR(68)
 695     CHARLIKE_HDR(69)
 696     CHARLIKE_HDR(70)
 697     CHARLIKE_HDR(71)
 698     CHARLIKE_HDR(72)
 699     CHARLIKE_HDR(73)
 700     CHARLIKE_HDR(74)
 701     CHARLIKE_HDR(75)
 702     CHARLIKE_HDR(76)
 703     CHARLIKE_HDR(77)
 704     CHARLIKE_HDR(78)
 705     CHARLIKE_HDR(79)
 706     CHARLIKE_HDR(80)
 707     CHARLIKE_HDR(81)
 708     CHARLIKE_HDR(82)
 709     CHARLIKE_HDR(83)
 710     CHARLIKE_HDR(84)
 711     CHARLIKE_HDR(85)
 712     CHARLIKE_HDR(86)
 713     CHARLIKE_HDR(87)
 714     CHARLIKE_HDR(88)
 715     CHARLIKE_HDR(89)
 716     CHARLIKE_HDR(90)
 717     CHARLIKE_HDR(91)
 718     CHARLIKE_HDR(92)
 719     CHARLIKE_HDR(93)
 720     CHARLIKE_HDR(94)
 721     CHARLIKE_HDR(95)
 722     CHARLIKE_HDR(96)
 723     CHARLIKE_HDR(97)
 724     CHARLIKE_HDR(98)
 725     CHARLIKE_HDR(99)
 726     CHARLIKE_HDR(100)
 727     CHARLIKE_HDR(101)
 728     CHARLIKE_HDR(102)
 729     CHARLIKE_HDR(103)
 730     CHARLIKE_HDR(104)
 731     CHARLIKE_HDR(105)
 732     CHARLIKE_HDR(106)
 733     CHARLIKE_HDR(107)
 734     CHARLIKE_HDR(108)
 735     CHARLIKE_HDR(109)
 736     CHARLIKE_HDR(110)
 737     CHARLIKE_HDR(111)
 738     CHARLIKE_HDR(112)
 739     CHARLIKE_HDR(113)
 740     CHARLIKE_HDR(114)
 741     CHARLIKE_HDR(115)
 742     CHARLIKE_HDR(116)
 743     CHARLIKE_HDR(117)
 744     CHARLIKE_HDR(118)
 745     CHARLIKE_HDR(119)
 746     CHARLIKE_HDR(120)
 747     CHARLIKE_HDR(121)
 748     CHARLIKE_HDR(122)
 749     CHARLIKE_HDR(123)
 750     CHARLIKE_HDR(124)
 751     CHARLIKE_HDR(125)
 752     CHARLIKE_HDR(126)
 753     CHARLIKE_HDR(127)
 754     CHARLIKE_HDR(128)
 755     CHARLIKE_HDR(129)
 756     CHARLIKE_HDR(130)
 757     CHARLIKE_HDR(131)
 758     CHARLIKE_HDR(132)
 759     CHARLIKE_HDR(133)
 760     CHARLIKE_HDR(134)
 761     CHARLIKE_HDR(135)
 762     CHARLIKE_HDR(136)
 763     CHARLIKE_HDR(137)
 764     CHARLIKE_HDR(138)
 765     CHARLIKE_HDR(139)
 766     CHARLIKE_HDR(140)
 767     CHARLIKE_HDR(141)
 768     CHARLIKE_HDR(142)
 769     CHARLIKE_HDR(143)
 770     CHARLIKE_HDR(144)
 771     CHARLIKE_HDR(145)
 772     CHARLIKE_HDR(146)
 773     CHARLIKE_HDR(147)
 774     CHARLIKE_HDR(148)
 775     CHARLIKE_HDR(149)
 776     CHARLIKE_HDR(150)
 777     CHARLIKE_HDR(151)
 778     CHARLIKE_HDR(152)
 779     CHARLIKE_HDR(153)
 780     CHARLIKE_HDR(154)
 781     CHARLIKE_HDR(155)
 782     CHARLIKE_HDR(156)
 783     CHARLIKE_HDR(157)
 784     CHARLIKE_HDR(158)
 785     CHARLIKE_HDR(159)
 786     CHARLIKE_HDR(160)
 787     CHARLIKE_HDR(161)
 788     CHARLIKE_HDR(162)
 789     CHARLIKE_HDR(163)
 790     CHARLIKE_HDR(164)
 791     CHARLIKE_HDR(165)
 792     CHARLIKE_HDR(166)
 793     CHARLIKE_HDR(167)
 794     CHARLIKE_HDR(168)
 795     CHARLIKE_HDR(169)
 796     CHARLIKE_HDR(170)
 797     CHARLIKE_HDR(171)
 798     CHARLIKE_HDR(172)
 799     CHARLIKE_HDR(173)
 800     CHARLIKE_HDR(174)
 801     CHARLIKE_HDR(175)
 802     CHARLIKE_HDR(176)
 803     CHARLIKE_HDR(177)
 804     CHARLIKE_HDR(178)
 805     CHARLIKE_HDR(179)
 806     CHARLIKE_HDR(180)
 807     CHARLIKE_HDR(181)
 808     CHARLIKE_HDR(182)
 809     CHARLIKE_HDR(183)
 810     CHARLIKE_HDR(184)
 811     CHARLIKE_HDR(185)
 812     CHARLIKE_HDR(186)
 813     CHARLIKE_HDR(187)
 814     CHARLIKE_HDR(188)
 815     CHARLIKE_HDR(189)
 816     CHARLIKE_HDR(190)
 817     CHARLIKE_HDR(191)
 818     CHARLIKE_HDR(192)
 819     CHARLIKE_HDR(193)
 820     CHARLIKE_HDR(194)
 821     CHARLIKE_HDR(195)
 822     CHARLIKE_HDR(196)
 823     CHARLIKE_HDR(197)
 824     CHARLIKE_HDR(198)
 825     CHARLIKE_HDR(199)
 826     CHARLIKE_HDR(200)
 827     CHARLIKE_HDR(201)
 828     CHARLIKE_HDR(202)
 829     CHARLIKE_HDR(203)
 830     CHARLIKE_HDR(204)
 831     CHARLIKE_HDR(205)
 832     CHARLIKE_HDR(206)
 833     CHARLIKE_HDR(207)
 834     CHARLIKE_HDR(208)
 835     CHARLIKE_HDR(209)
 836     CHARLIKE_HDR(210)
 837     CHARLIKE_HDR(211)
 838     CHARLIKE_HDR(212)
 839     CHARLIKE_HDR(213)
 840     CHARLIKE_HDR(214)
 841     CHARLIKE_HDR(215)
 842     CHARLIKE_HDR(216)
 843     CHARLIKE_HDR(217)
 844     CHARLIKE_HDR(218)
 845     CHARLIKE_HDR(219)
 846     CHARLIKE_HDR(220)
 847     CHARLIKE_HDR(221)
 848     CHARLIKE_HDR(222)
 849     CHARLIKE_HDR(223)
 850     CHARLIKE_HDR(224)
 851     CHARLIKE_HDR(225)
 852     CHARLIKE_HDR(226)
 853     CHARLIKE_HDR(227)
 854     CHARLIKE_HDR(228)
 855     CHARLIKE_HDR(229)
 856     CHARLIKE_HDR(230)
 857     CHARLIKE_HDR(231)
 858     CHARLIKE_HDR(232)
 859     CHARLIKE_HDR(233)
 860     CHARLIKE_HDR(234)
 861     CHARLIKE_HDR(235)
 862     CHARLIKE_HDR(236)
 863     CHARLIKE_HDR(237)
 864     CHARLIKE_HDR(238)
 865     CHARLIKE_HDR(239)
 866     CHARLIKE_HDR(240)
 867     CHARLIKE_HDR(241)
 868     CHARLIKE_HDR(242)
 869     CHARLIKE_HDR(243)
 870     CHARLIKE_HDR(244)
 871     CHARLIKE_HDR(245)
 872     CHARLIKE_HDR(246)
 873     CHARLIKE_HDR(247)
 874     CHARLIKE_HDR(248)
 875     CHARLIKE_HDR(249)
 876     CHARLIKE_HDR(250)
 877     CHARLIKE_HDR(251)
 878     CHARLIKE_HDR(252)
 879     CHARLIKE_HDR(253)
 880     CHARLIKE_HDR(254)
 881     CHARLIKE_HDR(255)
 882 }
 883
 884 section "data" {
 885  stg_INTLIKE_closure:
 886     INTLIKE_HDR(-16)    /* MIN_INTLIKE == -16 */
 887     INTLIKE_HDR(-15)
 888     INTLIKE_HDR(-14)
 889     INTLIKE_HDR(-13)
 890     INTLIKE_HDR(-12)
 891     INTLIKE_HDR(-11)
 892     INTLIKE_HDR(-10)
 893     INTLIKE_HDR(-9)
 894     INTLIKE_HDR(-8)
 895     INTLIKE_HDR(-7)
 896     INTLIKE_HDR(-6)
 897     INTLIKE_HDR(-5)
 898     INTLIKE_HDR(-4)
 899     INTLIKE_HDR(-3)
 900     INTLIKE_HDR(-2)
 901     INTLIKE_HDR(-1)
 902     INTLIKE_HDR(0)
 903     INTLIKE_HDR(1)
 904     INTLIKE_HDR(2)
 905     INTLIKE_HDR(3)
 906     INTLIKE_HDR(4)
 907     INTLIKE_HDR(5)
 908     INTLIKE_HDR(6)
 909     INTLIKE_HDR(7)
 910     INTLIKE_HDR(8)
 911     INTLIKE_HDR(9)
 912     INTLIKE_HDR(10)
 913     INTLIKE_HDR(11)
 914     INTLIKE_HDR(12)
 915     INTLIKE_HDR(13)
 916     INTLIKE_HDR(14)
 917     INTLIKE_HDR(15)
 918     INTLIKE_HDR(16)     /* MAX_INTLIKE == 16 */
 919 }