StgMiscClosures.cmm

/* ----------------------------------------------------------------------------
 *
 * (c) The GHC Team, 1998-2004
 *
 * Entry code for various built-in closure types.
 *
 * 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"

import pthread_mutex_lock;
import ghczmprim_GHCziTypes_Czh_static_info;
import ghczmprim_GHCziTypes_Izh_static_info;
import EnterCriticalSection;
import LeaveCriticalSection;

/* ----------------------------------------------------------------------------
   Stack underflow
   ------------------------------------------------------------------------- */

INFO_TABLE_RET (stg_stack_underflow_frame, UNDERFLOW_FRAME,
                W_ info_ptr, P_ unused)
    /* no args => explicit stack */
{
    W_ new_tso;
    W_ ret_off;

    SAVE_STGREGS

    SAVE_THREAD_STATE();
    ("ptr" ret_off) = foreign "C" threadStackUnderflow(MyCapability(),
                                                       CurrentTSO);
    LOAD_THREAD_STATE();

    RESTORE_STGREGS

    jump %ENTRY_CODE(Sp(ret_off)) [*]; // NB. all registers live!
}

/* ----------------------------------------------------------------------------
   Restore a saved cost centre
   ------------------------------------------------------------------------- */

INFO_TABLE_RET (stg_restore_cccs, RET_SMALL, W_ info_ptr, W_ cccs)
{
#if defined(PROFILING)
    CCCS = Sp(1);
#endif
    Sp_adj(2);
    jump %ENTRY_CODE(Sp(0)) [*]; // NB. all registers live!
}

/* ----------------------------------------------------------------------------
   Support for the bytecode interpreter.
   ------------------------------------------------------------------------- */

/* 9 bits of return code for constructors created by the interpreter. */
stg_interp_constr_entry (P_ ret)
{
    return (ret);
}

/* Some info tables to be used when compiled code returns a value to
   the interpreter, i.e. the interpreter pushes one of these onto the
   stack before entering a value.  What the code does is to
   impedance-match the compiled return convention (in R1p/R1n/F1/D1 etc) to
   the interpreter's convention (returned value is on top of stack),
   and then cause the scheduler to enter the interpreter.

   On entry, the stack (growing down) looks like this:

      ptr to BCO holding return continuation
      ptr to one of these info tables.

   The info table code, both direct and vectored, must:
      * push R1/F1/D1 on the stack, and its tag if necessary
      * push the BCO (so it's now on the stack twice)
      * Yield, ie, go to the scheduler.

   Scheduler examines the t.o.s, discovers it is a BCO, and proceeds
   directly to the bytecode interpreter.  That pops the top element
   (the BCO, containing the return continuation), and interprets it.
   Net result: return continuation gets interpreted, with the
   following stack:

      ptr to this BCO
      ptr to the info table just jumped thru
      return value

   which is just what we want -- the "standard" return layout for the
   interpreter.  Hurrah!

   Don't ask me how unboxed tuple returns are supposed to work.  We
   haven't got a good story about that yet.
*/

INFO_TABLE_RET( stg_ctoi_R1p, RET_BCO)
    /* explicit stack */
{
    Sp_adj(-2);
    Sp(1) = R1;
    Sp(0) = stg_enter_info;
    jump stg_yield_to_interpreter [];
}

/*
 * When the returned value is a pointer, but unlifted, in R1 ...
 */
INFO_TABLE_RET( stg_ctoi_R1unpt, RET_BCO )
    /* explicit stack */
{
    Sp_adj(-2);
    Sp(1) = R1;
    Sp(0) = stg_ret_p_info;
    jump stg_yield_to_interpreter [];
}

/*
 * When the returned value is a non-pointer in R1 ...
 */
INFO_TABLE_RET( stg_ctoi_R1n, RET_BCO )
    /* explicit stack */
{
    Sp_adj(-2);
    Sp(1) = R1;
    Sp(0) = stg_ret_n_info;
    jump stg_yield_to_interpreter [];
}

/*
 * When the returned value is in F1
 */
INFO_TABLE_RET( stg_ctoi_F1, RET_BCO )
    /* explicit stack */
{
    Sp_adj(-2);
    F_[Sp + WDS(1)] = F1;
    Sp(0) = stg_ret_f_info;
    jump stg_yield_to_interpreter [];
}

/*
 * When the returned value is in D1
 */
INFO_TABLE_RET( stg_ctoi_D1, RET_BCO )
    /* explicit stack */
{
    Sp_adj(-1) - SIZEOF_DOUBLE;
    D_[Sp + WDS(1)] = D1;
    Sp(0) = stg_ret_d_info;
    jump stg_yield_to_interpreter [];
}

/*
 * When the returned value is in L1
 */
INFO_TABLE_RET( stg_ctoi_L1, RET_BCO )
    /* explicit stack */
{
    Sp_adj(-1) - 8;
    L_[Sp + WDS(1)] = L1;
    Sp(0) = stg_ret_l_info;
    jump stg_yield_to_interpreter [];
}

/*
 * When the returned value is a void
 */
INFO_TABLE_RET( stg_ctoi_V, RET_BCO )
    /* explicit stack */
{
    Sp_adj(-1);
    Sp(0) = stg_ret_v_info;
    jump stg_yield_to_interpreter [];
}

/*
 * Dummy info table pushed on the top of the stack when the interpreter
 * should apply the BCO on the stack to its arguments, also on the
 * stack.
 */
INFO_TABLE_RET( stg_apply_interp, RET_BCO )
    /* explicit stack */
{
    /* Just in case we end up in here... (we shouldn't) */
    jump stg_yield_to_interpreter [];
}

/* ----------------------------------------------------------------------------
   Entry code for a BCO
   ------------------------------------------------------------------------- */

INFO_TABLE_FUN( stg_BCO, 4, 0, BCO, "BCO", "BCO", ARG_BCO )
    /* explicit stack */
{
  /* entering a BCO means "apply it", same as a function */
  Sp_adj(-2);
  Sp(1) = R1;
  Sp(0) = stg_apply_interp_info;
  jump stg_yield_to_interpreter [];
}

/* ----------------------------------------------------------------------------
   Info tables for indirections.

   SPECIALISED INDIRECTIONS: we have a specialised indirection for direct returns,
   so that we can avoid entering
   the object when we know it points directly to a value.  The update
   code (Updates.cmm) updates objects with the appropriate kind of
   indirection.  We only do this for young-gen indirections.
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_IND,1,0,IND,"IND","IND")
#if 0
/*
  This version in high-level cmm generates slightly less good code
  than the low-level version below it. (ToDo)
*/
    (P_ node)
{
    TICK_ENT_DYN_IND(); /* tick */
    node = UNTAG(StgInd_indirectee(node));
    TICK_ENT_VIA_NODE();
    jump %GET_ENTRY(node) (node);
}
#else
    /* explicit stack */
{
    TICK_ENT_DYN_IND(); /* tick */
    R1 = UNTAG(StgInd_indirectee(R1));
    TICK_ENT_VIA_NODE();
    jump %GET_ENTRY(R1) [R1];
}
#endif

INFO_TABLE(stg_IND_direct,1,0,IND,"IND","IND")
    (P_ node)
{
    TICK_ENT_DYN_IND(); /* tick */
    node = StgInd_indirectee(node);
    TICK_ENT_VIA_NODE();
    jump %ENTRY_CODE(Sp(0)) (node);
}

INFO_TABLE(stg_IND_STATIC,1,0,IND_STATIC,"IND_STATIC","IND_STATIC")
    /* explicit stack */
{
    TICK_ENT_STATIC_IND(); /* tick */
    R1 = UNTAG(StgInd_indirectee(R1));
    TICK_ENT_VIA_NODE();
    jump %GET_ENTRY(R1) [R1];
}

INFO_TABLE(stg_IND_PERM,1,0,IND_PERM,"IND_PERM","IND_PERM")
    /* explicit stack */
{
    /* Don't add INDs to granularity cost */

    /* Don't: TICK_ENT_STATIC_IND(Node); for ticky-ticky; this ind is
       here only to help profiling */

#if defined(TICKY_TICKY) && !defined(PROFILING)
    /* TICKY_TICKY && !PROFILING means PERM_IND *replaces* an IND, rather than
       being extra  */
    TICK_ENT_PERM_IND();
#endif

    LDV_ENTER(R1);

    /* For ticky-ticky, change the perm_ind to a normal ind on first
     * entry, so the number of ent_perm_inds is the number of *thunks*
     * entered again, not the number of subsequent entries.
     *
     * Since this screws up cost centres, we die if profiling and
     * ticky_ticky are on at the same time.  KSW 1999-01.
     */
#ifdef TICKY_TICKY
#  ifdef PROFILING
#    error Profiling and ticky-ticky do not mix at present!
#  endif  /* PROFILING */
    StgHeader_info(R1) = stg_IND_info;
#endif /* TICKY_TICKY */

    R1 = UNTAG(StgInd_indirectee(R1));

#if defined(TICKY_TICKY) && !defined(PROFILING)
    TICK_ENT_VIA_NODE();
#endif

    jump %GET_ENTRY(R1) [R1];
}

/* ----------------------------------------------------------------------------
   Black holes.

   Entering a black hole normally causes a cyclic data dependency, but
   in the concurrent world, black holes are synchronization points,
   and they are turned into blocking queues when there are threads
   waiting for the evaluation of the closure to finish.
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_BLACKHOLE,1,0,BLACKHOLE,"BLACKHOLE","BLACKHOLE")
    (P_ node)
{
    W_ r, info, owner, bd;
    P_ p, bq, msg;

    TICK_ENT_DYN_IND(); /* tick */

retry:
    p = StgInd_indirectee(node);
    if (GETTAG(p) != 0) {
        return (p);
    }

    info = StgHeader_info(p);
    if (info == stg_IND_info) {
        // This could happen, if e.g. we got a BLOCKING_QUEUE that has
        // just been replaced with an IND by another thread in
        // wakeBlockingQueue().
        goto retry;
    }

    if (info == stg_TSO_info ||
        info == stg_BLOCKING_QUEUE_CLEAN_info ||
        info == stg_BLOCKING_QUEUE_DIRTY_info)
    {
        ("ptr" msg) = ccall allocate(MyCapability() "ptr",
                                     BYTES_TO_WDS(SIZEOF_MessageBlackHole));

        SET_HDR(msg, stg_MSG_BLACKHOLE_info, CCS_SYSTEM);
        MessageBlackHole_tso(msg) = CurrentTSO;
        MessageBlackHole_bh(msg) = node;

        (r) = ccall messageBlackHole(MyCapability() "ptr", msg "ptr");

        if (r == 0) {
            goto retry;
        } else {
            StgTSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
            StgTSO_block_info(CurrentTSO) = msg;
            jump stg_block_blackhole(node);
        }
    }
    else
    {
        ENTER(p);
    }
}

INFO_TABLE(__stg_EAGER_BLACKHOLE,1,0,BLACKHOLE,"BLACKHOLE","BLACKHOLE")
    (P_ node)
{
    jump ENTRY_LBL(stg_BLACKHOLE) (node);
}

// CAF_BLACKHOLE is allocated when entering a CAF.  The reason it is
// distinct from BLACKHOLE is so that we can tell the difference
// between an update frame on the stack that points to a CAF under
// evaluation, and one that points to a closure that is under
// evaluation by another thread (a BLACKHOLE).  See threadPaused().
//
INFO_TABLE(stg_CAF_BLACKHOLE,1,0,BLACKHOLE,"BLACKHOLE","BLACKHOLE")
    (P_ node)
{
    jump ENTRY_LBL(stg_BLACKHOLE) (node);
}

INFO_TABLE(stg_BLOCKING_QUEUE_CLEAN,4,0,BLOCKING_QUEUE,"BLOCKING_QUEUE","BLOCKING_QUEUE")
{ foreign "C" barf("BLOCKING_QUEUE_CLEAN object entered!") never returns; }


INFO_TABLE(stg_BLOCKING_QUEUE_DIRTY,4,0,BLOCKING_QUEUE,"BLOCKING_QUEUE","BLOCKING_QUEUE")
{ foreign "C" barf("BLOCKING_QUEUE_DIRTY object entered!") never returns; }


/* ----------------------------------------------------------------------------
   Whiteholes are used for the "locked" state of a closure (see lockClosure())
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_WHITEHOLE, 0,0, WHITEHOLE, "WHITEHOLE", "WHITEHOLE")
    (P_ node)
{
#if defined(THREADED_RTS)
    W_ info, i;

    i = 0;
loop:
    // spin until the WHITEHOLE is updated
    info = StgHeader_info(node);
    if (info == stg_WHITEHOLE_info) {
        i = i + 1;
        if (i == SPIN_COUNT) {
            i = 0;
            ccall yieldThread();
        }
        goto loop;
    }
    jump %ENTRY_CODE(info) (node);
#else
    ccall barf("WHITEHOLE object entered!") never returns;
#endif
}

/* ----------------------------------------------------------------------------
   Some static info tables for things that don't get entered, and
   therefore don't need entry code (i.e. boxed but unpointed objects)
   NON_ENTERABLE_ENTRY_CODE now defined at the beginning of the file
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_TSO, 0,0,TSO, "TSO", "TSO")
{ foreign "C" barf("TSO object entered!") never returns; }

INFO_TABLE(stg_STACK, 0,0, STACK, "STACK", "STACK")
{ foreign "C" barf("STACK object entered!") never returns; }

/* ----------------------------------------------------------------------------
   Weak pointers

   Live weak pointers have a special closure type.  Dead ones are just
   nullary constructors (although they live on the heap - we overwrite
   live weak pointers with dead ones).
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_WEAK,1,4,WEAK,"WEAK","WEAK")
{ foreign "C" barf("WEAK object entered!") never returns; }

/*
 * It's important when turning an existing WEAK into a DEAD_WEAK
 * (which is what finalizeWeak# does) that we don't lose the link
 * field and break the linked list of weak pointers.  Hence, we give
 * DEAD_WEAK 5 non-pointer fields.
 */
INFO_TABLE_CONSTR(stg_DEAD_WEAK,0,5,0,CONSTR,"DEAD_WEAK","DEAD_WEAK")
{ foreign "C" barf("DEAD_WEAK object entered!") never returns; }

/* ----------------------------------------------------------------------------
   C finalizer lists

   Singly linked lists that chain multiple C finalizers on a weak pointer.
   ------------------------------------------------------------------------- */

INFO_TABLE_CONSTR(stg_C_FINALIZER_LIST,1,4,0,CONSTR,"C_FINALIZER_LIST","C_FINALIZER_LIST")
{ foreign "C" barf("C_FINALIZER_LIST object entered!") never returns; }

/* ----------------------------------------------------------------------------
   NO_FINALIZER

   This is a static nullary constructor (like []) that we use to mark an empty
   finalizer in a weak pointer object.
   ------------------------------------------------------------------------- */

INFO_TABLE_CONSTR(stg_NO_FINALIZER,0,0,0,CONSTR_NOCAF_STATIC,"NO_FINALIZER","NO_FINALIZER")
{ foreign "C" barf("NO_FINALIZER object entered!") never returns; }

CLOSURE(stg_NO_FINALIZER_closure,stg_NO_FINALIZER);

/* ----------------------------------------------------------------------------
   Stable Names are unlifted too.
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_STABLE_NAME,0,1,PRIM,"STABLE_NAME","STABLE_NAME")
{ foreign "C" barf("STABLE_NAME object entered!") never returns; }

/* ----------------------------------------------------------------------------
   MVars

   There are two kinds of these: full and empty.  We need an info table
   and entry code for each type.
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_MVAR_CLEAN,3,0,MVAR_CLEAN,"MVAR","MVAR")
{ foreign "C" barf("MVAR object entered!") never returns; }

INFO_TABLE(stg_MVAR_DIRTY,3,0,MVAR_DIRTY,"MVAR","MVAR")
{ foreign "C" barf("MVAR object entered!") never returns; }

/* -----------------------------------------------------------------------------
   STM
   -------------------------------------------------------------------------- */

INFO_TABLE(stg_TVAR_CLEAN, 2, 1, TVAR, "TVAR", "TVAR")
{ foreign "C" barf("TVAR_CLEAN object entered!") never returns; }

INFO_TABLE(stg_TVAR_DIRTY, 2, 1, TVAR, "TVAR", "TVAR")
{ foreign "C" barf("TVAR_DIRTY object entered!") never returns; }

INFO_TABLE(stg_TVAR_WATCH_QUEUE, 3, 0, MUT_PRIM, "TVAR_WATCH_QUEUE", "TVAR_WATCH_QUEUE")
{ foreign "C" barf("TVAR_WATCH_QUEUE object entered!") never returns; }

INFO_TABLE(stg_ATOMIC_INVARIANT, 2, 1, MUT_PRIM, "ATOMIC_INVARIANT", "ATOMIC_INVARIANT")
{ foreign "C" barf("ATOMIC_INVARIANT object entered!") never returns; }

INFO_TABLE(stg_INVARIANT_CHECK_QUEUE, 3, 0, MUT_PRIM, "INVARIANT_CHECK_QUEUE", "INVARIANT_CHECK_QUEUE")
{ foreign "C" barf("INVARIANT_CHECK_QUEUE object entered!") never returns; }

INFO_TABLE(stg_TREC_CHUNK, 0, 0, TREC_CHUNK, "TREC_CHUNK", "TREC_CHUNK")
{ foreign "C" barf("TREC_CHUNK object entered!") never returns; }

INFO_TABLE(stg_TREC_HEADER, 3, 1, MUT_PRIM, "TREC_HEADER", "TREC_HEADER")
{ foreign "C" barf("TREC_HEADER object entered!") never returns; }

INFO_TABLE_CONSTR(stg_END_STM_WATCH_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_STM_WATCH_QUEUE","END_STM_WATCH_QUEUE")
{ foreign "C" barf("END_STM_WATCH_QUEUE object entered!") never returns; }

INFO_TABLE_CONSTR(stg_END_INVARIANT_CHECK_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_INVARIANT_CHECK_QUEUE","END_INVARIANT_CHECK_QUEUE")
{ foreign "C" barf("END_INVARIANT_CHECK_QUEUE object entered!") never returns; }

INFO_TABLE_CONSTR(stg_END_STM_CHUNK_LIST,0,0,0,CONSTR_NOCAF_STATIC,"END_STM_CHUNK_LIST","END_STM_CHUNK_LIST")
{ foreign "C" barf("END_STM_CHUNK_LIST object entered!") never returns; }

INFO_TABLE_CONSTR(stg_NO_TREC,0,0,0,CONSTR_NOCAF_STATIC,"NO_TREC","NO_TREC")
{ foreign "C" barf("NO_TREC object entered!") never returns; }

CLOSURE(stg_END_STM_WATCH_QUEUE_closure,stg_END_STM_WATCH_QUEUE);

CLOSURE(stg_END_INVARIANT_CHECK_QUEUE_closure,stg_END_INVARIANT_CHECK_QUEUE);

CLOSURE(stg_END_STM_CHUNK_LIST_closure,stg_END_STM_CHUNK_LIST);

CLOSURE(stg_NO_TREC_closure,stg_NO_TREC);

/* ----------------------------------------------------------------------------
   Messages
   ------------------------------------------------------------------------- */

// PRIM rather than CONSTR, because PRIM objects cannot be duplicated by the GC.

INFO_TABLE_CONSTR(stg_MSG_TRY_WAKEUP,2,0,0,PRIM,"MSG_TRY_WAKEUP","MSG_TRY_WAKEUP")
{ foreign "C" barf("MSG_TRY_WAKEUP object entered!") never returns; }

INFO_TABLE_CONSTR(stg_MSG_THROWTO,4,0,0,PRIM,"MSG_THROWTO","MSG_THROWTO")
{ foreign "C" barf("MSG_THROWTO object entered!") never returns; }

INFO_TABLE_CONSTR(stg_MSG_BLACKHOLE,3,0,0,PRIM,"MSG_BLACKHOLE","MSG_BLACKHOLE")
{ foreign "C" barf("MSG_BLACKHOLE object entered!") never returns; }

// used to overwrite a MSG_THROWTO when the message has been used/revoked
INFO_TABLE_CONSTR(stg_MSG_NULL,1,0,0,PRIM,"MSG_NULL","MSG_NULL")
{ foreign "C" barf("MSG_NULL object entered!") never returns; }

/* ----------------------------------------------------------------------------
   END_TSO_QUEUE

   This is a static nullary constructor (like []) that we use to mark the
   end of a linked TSO queue.
   ------------------------------------------------------------------------- */

INFO_TABLE_CONSTR(stg_END_TSO_QUEUE,0,0,0,CONSTR_NOCAF_STATIC,"END_TSO_QUEUE","END_TSO_QUEUE")
{ foreign "C" barf("END_TSO_QUEUE object entered!") never returns; }

CLOSURE(stg_END_TSO_QUEUE_closure,stg_END_TSO_QUEUE);

/* ----------------------------------------------------------------------------
   GCD_CAF
   ------------------------------------------------------------------------- */

INFO_TABLE_CONSTR(stg_GCD_CAF,0,0,0,CONSTR_NOCAF_STATIC,"GCD_CAF","GCD_CAF")
{ foreign "C" barf("Evaluated a CAF that was GC'd!") never returns; }

/* ----------------------------------------------------------------------------
   STM_AWOKEN

   This is a static nullary constructor (like []) that we use to mark a
   thread waiting on an STM wakeup
   ------------------------------------------------------------------------- */

INFO_TABLE_CONSTR(stg_STM_AWOKEN,0,0,0,CONSTR_NOCAF_STATIC,"STM_AWOKEN","STM_AWOKEN")
{ foreign "C" barf("STM_AWOKEN object entered!") never returns; }

CLOSURE(stg_STM_AWOKEN_closure,stg_STM_AWOKEN);

/* ----------------------------------------------------------------------------
   Arrays

   These come in two basic flavours: arrays of data (StgArrWords) and arrays of
   pointers (StgArrPtrs).  They all have a similar layout:

   ___________________________
   | Info | No. of | data....
   |  Ptr | Words  |
   ---------------------------

   These are *unpointed* objects: i.e. they cannot be entered.

   ------------------------------------------------------------------------- */

INFO_TABLE(stg_ARR_WORDS, 0, 0, ARR_WORDS, "ARR_WORDS", "ARR_WORDS")
{ foreign "C" barf("ARR_WORDS object entered!") never returns; }

INFO_TABLE(stg_MUT_ARR_PTRS_CLEAN, 0, 0, MUT_ARR_PTRS_CLEAN, "MUT_ARR_PTRS_CLEAN", "MUT_ARR_PTRS_CLEAN")
{ foreign "C" barf("MUT_ARR_PTRS_CLEAN object entered!") never returns; }

INFO_TABLE(stg_MUT_ARR_PTRS_DIRTY, 0, 0, MUT_ARR_PTRS_DIRTY, "MUT_ARR_PTRS_DIRTY", "MUT_ARR_PTRS_DIRTY")
{ foreign "C" barf("MUT_ARR_PTRS_DIRTY object entered!") never returns; }

INFO_TABLE(stg_MUT_ARR_PTRS_FROZEN, 0, 0, MUT_ARR_PTRS_FROZEN, "MUT_ARR_PTRS_FROZEN", "MUT_ARR_PTRS_FROZEN")
{ foreign "C" barf("MUT_ARR_PTRS_FROZEN object entered!") never returns; }

INFO_TABLE(stg_MUT_ARR_PTRS_FROZEN0, 0, 0, MUT_ARR_PTRS_FROZEN0, "MUT_ARR_PTRS_FROZEN0", "MUT_ARR_PTRS_FROZEN0")
{ foreign "C" barf("MUT_ARR_PTRS_FROZEN0 object entered!") never returns; }

/* ----------------------------------------------------------------------------
   Mutable Variables
   ------------------------------------------------------------------------- */

INFO_TABLE(stg_MUT_VAR_CLEAN, 1, 0, MUT_VAR_CLEAN, "MUT_VAR_CLEAN", "MUT_VAR_CLEAN")
{ foreign "C" barf("MUT_VAR_CLEAN object entered!") never returns; }
INFO_TABLE(stg_MUT_VAR_DIRTY, 1, 0, MUT_VAR_DIRTY, "MUT_VAR_DIRTY", "MUT_VAR_DIRTY")
{ foreign "C" barf("MUT_VAR_DIRTY object entered!") never returns; }

/* ----------------------------------------------------------------------------
   Dummy return closure

   Entering this closure will just return to the address on the top of the
   stack.  Useful for getting a thread in a canonical form where we can
   just enter the top stack word to start the thread.  (see deleteThread)
 * ------------------------------------------------------------------------- */

INFO_TABLE( stg_dummy_ret, 0, 0, CONSTR_NOCAF_STATIC, "DUMMY_RET", "DUMMY_RET")
    ()
{
    return ();
}
CLOSURE(stg_dummy_ret_closure,stg_dummy_ret);

/* ----------------------------------------------------------------------------
   MVAR_TSO_QUEUE
   ------------------------------------------------------------------------- */

INFO_TABLE_CONSTR(stg_MVAR_TSO_QUEUE,2,0,0,PRIM,"MVAR_TSO_QUEUE","MVAR_TSO_QUEUE")
{ foreign "C" barf("MVAR_TSO_QUEUE object entered!") never returns; }

/* ----------------------------------------------------------------------------
   CHARLIKE and INTLIKE closures.

   These are static representations of Chars and small Ints, so that
   we can remove dynamic Chars and Ints during garbage collection and
   replace them with references to the static objects.
   ------------------------------------------------------------------------- */

#if defined(COMPILING_WINDOWS_DLL)
/*
 * When sticking the RTS in a Windows DLL, we delay populating the
 * Charlike and Intlike tables until load-time, which is only
 * when we've got the real addresses to the C# and I# closures.
 *
 * -- this is currently broken BL 2009/11/14.
 *    we don't rewrite to static closures at all with Windows DLLs.
 */
// #warning Is this correct? _imp is a pointer!
#define Char_hash_static_info _imp__ghczmprim_GHCziTypes_Czh_static_info
#define Int_hash_static_info _imp__ghczmprim_GHCziTypes_Izh_static_info
#else
#define Char_hash_static_info ghczmprim_GHCziTypes_Czh_static_info
#define Int_hash_static_info ghczmprim_GHCziTypes_Izh_static_info
#endif


#define CHARLIKE_HDR(n)  CLOSURE(Char_hash_static_info, n)
#define INTLIKE_HDR(n)   CLOSURE(Int_hash_static_info, n)

/* put these in the *data* section, since the garbage collector relies
 * on the fact that static closures live in the data section.
 */

#if !(defined(COMPILING_WINDOWS_DLL))
section "data" {
 stg_CHARLIKE_closure:
    CHARLIKE_HDR(0)
    CHARLIKE_HDR(1)
    CHARLIKE_HDR(2)
    CHARLIKE_HDR(3)
    CHARLIKE_HDR(4)
    CHARLIKE_HDR(5)
    CHARLIKE_HDR(6)
    CHARLIKE_HDR(7)
    CHARLIKE_HDR(8)
    CHARLIKE_HDR(9)
    CHARLIKE_HDR(10)
    CHARLIKE_HDR(11)
    CHARLIKE_HDR(12)
    CHARLIKE_HDR(13)
    CHARLIKE_HDR(14)
    CHARLIKE_HDR(15)
    CHARLIKE_HDR(16)
    CHARLIKE_HDR(17)
    CHARLIKE_HDR(18)
    CHARLIKE_HDR(19)
    CHARLIKE_HDR(20)
    CHARLIKE_HDR(21)
    CHARLIKE_HDR(22)
    CHARLIKE_HDR(23)
    CHARLIKE_HDR(24)
    CHARLIKE_HDR(25)
    CHARLIKE_HDR(26)
    CHARLIKE_HDR(27)
    CHARLIKE_HDR(28)
    CHARLIKE_HDR(29)
    CHARLIKE_HDR(30)
    CHARLIKE_HDR(31)
    CHARLIKE_HDR(32)
    CHARLIKE_HDR(33)
    CHARLIKE_HDR(34)
    CHARLIKE_HDR(35)
    CHARLIKE_HDR(36)
    CHARLIKE_HDR(37)
    CHARLIKE_HDR(38)
    CHARLIKE_HDR(39)
    CHARLIKE_HDR(40)
    CHARLIKE_HDR(41)
    CHARLIKE_HDR(42)
    CHARLIKE_HDR(43)
    CHARLIKE_HDR(44)
    CHARLIKE_HDR(45)
    CHARLIKE_HDR(46)
    CHARLIKE_HDR(47)
    CHARLIKE_HDR(48)
    CHARLIKE_HDR(49)
    CHARLIKE_HDR(50)
    CHARLIKE_HDR(51)
    CHARLIKE_HDR(52)
    CHARLIKE_HDR(53)
    CHARLIKE_HDR(54)
    CHARLIKE_HDR(55)
    CHARLIKE_HDR(56)
    CHARLIKE_HDR(57)
    CHARLIKE_HDR(58)
    CHARLIKE_HDR(59)
    CHARLIKE_HDR(60)
    CHARLIKE_HDR(61)
    CHARLIKE_HDR(62)
    CHARLIKE_HDR(63)
    CHARLIKE_HDR(64)
    CHARLIKE_HDR(65)
    CHARLIKE_HDR(66)
    CHARLIKE_HDR(67)
    CHARLIKE_HDR(68)
    CHARLIKE_HDR(69)
    CHARLIKE_HDR(70)
    CHARLIKE_HDR(71)
    CHARLIKE_HDR(72)
    CHARLIKE_HDR(73)
    CHARLIKE_HDR(74)
    CHARLIKE_HDR(75)
    CHARLIKE_HDR(76)
    CHARLIKE_HDR(77)
    CHARLIKE_HDR(78)
    CHARLIKE_HDR(79)
    CHARLIKE_HDR(80)
    CHARLIKE_HDR(81)
    CHARLIKE_HDR(82)
    CHARLIKE_HDR(83)
    CHARLIKE_HDR(84)
    CHARLIKE_HDR(85)
    CHARLIKE_HDR(86)
    CHARLIKE_HDR(87)
    CHARLIKE_HDR(88)
    CHARLIKE_HDR(89)
    CHARLIKE_HDR(90)
    CHARLIKE_HDR(91)
    CHARLIKE_HDR(92)
    CHARLIKE_HDR(93)
    CHARLIKE_HDR(94)
    CHARLIKE_HDR(95)
    CHARLIKE_HDR(96)
    CHARLIKE_HDR(97)
    CHARLIKE_HDR(98)
    CHARLIKE_HDR(99)
    CHARLIKE_HDR(100)
    CHARLIKE_HDR(101)
    CHARLIKE_HDR(102)
    CHARLIKE_HDR(103)
    CHARLIKE_HDR(104)
    CHARLIKE_HDR(105)
    CHARLIKE_HDR(106)
    CHARLIKE_HDR(107)
    CHARLIKE_HDR(108)
    CHARLIKE_HDR(109)
    CHARLIKE_HDR(110)
    CHARLIKE_HDR(111)
    CHARLIKE_HDR(112)
    CHARLIKE_HDR(113)
    CHARLIKE_HDR(114)
    CHARLIKE_HDR(115)
    CHARLIKE_HDR(116)
    CHARLIKE_HDR(117)
    CHARLIKE_HDR(118)
    CHARLIKE_HDR(119)
    CHARLIKE_HDR(120)
    CHARLIKE_HDR(121)
    CHARLIKE_HDR(122)
    CHARLIKE_HDR(123)
    CHARLIKE_HDR(124)
    CHARLIKE_HDR(125)
    CHARLIKE_HDR(126)
    CHARLIKE_HDR(127)
    CHARLIKE_HDR(128)
    CHARLIKE_HDR(129)
    CHARLIKE_HDR(130)
    CHARLIKE_HDR(131)
    CHARLIKE_HDR(132)
    CHARLIKE_HDR(133)
    CHARLIKE_HDR(134)
    CHARLIKE_HDR(135)
    CHARLIKE_HDR(136)
    CHARLIKE_HDR(137)
    CHARLIKE_HDR(138)
    CHARLIKE_HDR(139)
    CHARLIKE_HDR(140)
    CHARLIKE_HDR(141)
    CHARLIKE_HDR(142)
    CHARLIKE_HDR(143)
    CHARLIKE_HDR(144)
    CHARLIKE_HDR(145)
    CHARLIKE_HDR(146)
    CHARLIKE_HDR(147)
    CHARLIKE_HDR(148)
    CHARLIKE_HDR(149)
    CHARLIKE_HDR(150)
    CHARLIKE_HDR(151)
    CHARLIKE_HDR(152)
    CHARLIKE_HDR(153)
    CHARLIKE_HDR(154)
    CHARLIKE_HDR(155)
    CHARLIKE_HDR(156)
    CHARLIKE_HDR(157)
    CHARLIKE_HDR(158)
    CHARLIKE_HDR(159)
    CHARLIKE_HDR(160)
    CHARLIKE_HDR(161)
    CHARLIKE_HDR(162)
    CHARLIKE_HDR(163)
    CHARLIKE_HDR(164)
    CHARLIKE_HDR(165)
    CHARLIKE_HDR(166)
    CHARLIKE_HDR(167)
    CHARLIKE_HDR(168)
    CHARLIKE_HDR(169)
    CHARLIKE_HDR(170)
    CHARLIKE_HDR(171)
    CHARLIKE_HDR(172)
    CHARLIKE_HDR(173)
    CHARLIKE_HDR(174)
    CHARLIKE_HDR(175)
    CHARLIKE_HDR(176)
    CHARLIKE_HDR(177)
    CHARLIKE_HDR(178)
    CHARLIKE_HDR(179)
    CHARLIKE_HDR(180)
    CHARLIKE_HDR(181)
    CHARLIKE_HDR(182)
    CHARLIKE_HDR(183)
    CHARLIKE_HDR(184)
    CHARLIKE_HDR(185)
    CHARLIKE_HDR(186)
    CHARLIKE_HDR(187)
    CHARLIKE_HDR(188)
    CHARLIKE_HDR(189)
    CHARLIKE_HDR(190)
    CHARLIKE_HDR(191)
    CHARLIKE_HDR(192)
    CHARLIKE_HDR(193)
    CHARLIKE_HDR(194)
    CHARLIKE_HDR(195)
    CHARLIKE_HDR(196)
    CHARLIKE_HDR(197)
    CHARLIKE_HDR(198)
    CHARLIKE_HDR(199)
    CHARLIKE_HDR(200)
    CHARLIKE_HDR(201)
    CHARLIKE_HDR(202)
    CHARLIKE_HDR(203)
    CHARLIKE_HDR(204)
    CHARLIKE_HDR(205)
    CHARLIKE_HDR(206)
    CHARLIKE_HDR(207)
    CHARLIKE_HDR(208)
    CHARLIKE_HDR(209)
    CHARLIKE_HDR(210)
    CHARLIKE_HDR(211)
    CHARLIKE_HDR(212)
    CHARLIKE_HDR(213)
    CHARLIKE_HDR(214)
    CHARLIKE_HDR(215)
    CHARLIKE_HDR(216)
    CHARLIKE_HDR(217)
    CHARLIKE_HDR(218)
    CHARLIKE_HDR(219)
    CHARLIKE_HDR(220)
    CHARLIKE_HDR(221)
    CHARLIKE_HDR(222)
    CHARLIKE_HDR(223)
    CHARLIKE_HDR(224)
    CHARLIKE_HDR(225)
    CHARLIKE_HDR(226)
    CHARLIKE_HDR(227)
    CHARLIKE_HDR(228)
    CHARLIKE_HDR(229)
    CHARLIKE_HDR(230)
    CHARLIKE_HDR(231)
    CHARLIKE_HDR(232)
    CHARLIKE_HDR(233)
    CHARLIKE_HDR(234)
    CHARLIKE_HDR(235)
    CHARLIKE_HDR(236)
    CHARLIKE_HDR(237)
    CHARLIKE_HDR(238)
    CHARLIKE_HDR(239)
    CHARLIKE_HDR(240)
    CHARLIKE_HDR(241)
    CHARLIKE_HDR(242)
    CHARLIKE_HDR(243)
    CHARLIKE_HDR(244)
    CHARLIKE_HDR(245)
    CHARLIKE_HDR(246)
    CHARLIKE_HDR(247)
    CHARLIKE_HDR(248)
    CHARLIKE_HDR(249)
    CHARLIKE_HDR(250)
    CHARLIKE_HDR(251)
    CHARLIKE_HDR(252)
    CHARLIKE_HDR(253)
    CHARLIKE_HDR(254)
    CHARLIKE_HDR(255)
}

section "data" {
 stg_INTLIKE_closure:
    INTLIKE_HDR(-16) /* MIN_INTLIKE == -16 */
    INTLIKE_HDR(-15)
    INTLIKE_HDR(-14)
    INTLIKE_HDR(-13)
    INTLIKE_HDR(-12)
    INTLIKE_HDR(-11)
    INTLIKE_HDR(-10)
    INTLIKE_HDR(-9)
    INTLIKE_HDR(-8)
    INTLIKE_HDR(-7)
    INTLIKE_HDR(-6)
    INTLIKE_HDR(-5)
    INTLIKE_HDR(-4)
    INTLIKE_HDR(-3)
    INTLIKE_HDR(-2)
    INTLIKE_HDR(-1)
    INTLIKE_HDR(0)
    INTLIKE_HDR(1)
    INTLIKE_HDR(2)
    INTLIKE_HDR(3)
    INTLIKE_HDR(4)
    INTLIKE_HDR(5)
    INTLIKE_HDR(6)
    INTLIKE_HDR(7)
    INTLIKE_HDR(8)
    INTLIKE_HDR(9)
    INTLIKE_HDR(10)
    INTLIKE_HDR(11)
    INTLIKE_HDR(12)
    INTLIKE_HDR(13)
    INTLIKE_HDR(14)
    INTLIKE_HDR(15)
    INTLIKE_HDR(16)  /* MAX_INTLIKE == 16 */
}

#endif