aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/beam/erl_bif_info.c
blob: 48cda5261275e19d81f9c9ab8c9bd87a7a1568f8 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609

                   


                                                        




                                                                      
  



                                                                         
  












































                                                                               
                                      

                                                            



                                                


                                                         

                                                
      























































                                                                        
                                                              




































































































































































































































































































































































































































                                                                                 

                          













































                                                            

                                                          
             
                                                          




























                                                              


                                                         



                       
                   
                                        


                                                                                         















































































































































































































































































































































































                                                                                   
                               































































































































                                                                             
                                                                       
                                                  
                                                             




































































































































































































































                                                                               























                                                             













































































                                                                      










                                                                                          





















































































































































                                                                                 







                                                  
























































































































































































































































                                                                                  






























                                                                                                                 















































                                                                      








                                                      







                                                                              











                                                                                      





                                                                  







                                                                            




































































































































































































































































































































































































































































































































































































































































































































































                                                                                 
                                                                                 

























































































































                                                                              
                                                                































































































































































































                                                                               
                     

                                               

                                                

































































































































































                                                                              






                                                                   









































































































































































































































































































































































                                                                                










                                                                               





























































































































































                                                                                                           



                                                                   
                                                             



































































                                                                                                










                                  
 
                                    




                                

                                                         
 
                                                    













                                                           


                                                       
        
                     
                                       


                                                         
                                   




                                                       
                                     
                                         
 

                                  


                                                                     
                                           


                                                                                                
                                                   






                                                                                                  
                     






















                                                                                                







                    

                             









                                                        
/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 1999-2010. All Rights Reserved.
 *
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * %CopyrightEnd%
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "erl_nmgc.h"
#include "error.h"
#include "erl_driver.h"
#include "bif.h"
#include "big.h"
#include "erl_version.h"
#include "erl_db_util.h"
#include "erl_message.h"
#include "erl_binary.h"
#include "erl_db.h"
#include "erl_instrument.h"
#include "dist.h"
#include "erl_gc.h"
#ifdef ELIB_ALLOC_IS_CLIB
#include "elib_stat.h"
#endif
#ifdef HIPE
#include "hipe_arch.h"
#endif

#ifdef ERTS_ENABLE_LOCK_COUNT
#include "erl_lock_count.h"
#endif

#ifdef VALGRIND
#include <valgrind/valgrind.h>
#include <valgrind/memcheck.h>
#endif

#define DECL_AM(S) Eterm AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)

/* Keep erts_system_version as a global variable for easy access from a core */
static char erts_system_version[] = ("Erlang " ERLANG_OTP_RELEASE
				     " (erts-" ERLANG_VERSION ")"
#if !HEAP_ON_C_STACK && !HALFWORD_HEAP
				     " [no-c-stack-objects]"
#endif
#ifndef OTP_RELEASE
				     " [source]"
#endif	
#ifdef ARCH_64
#if HALFWORD_HEAP
				     " [64-bit halfword]"
#else
				     " [64-bit]"
#endif
#endif
#ifdef ERTS_SMP
				     " [smp:%bpu:%bpu]"
#endif
				     " [rq:%bpu]"
#ifdef USE_THREADS
				     " [async-threads:%d]"
#endif
#ifdef HIPE
				     " [hipe]"
#endif	
#ifdef ERTS_ENABLE_KERNEL_POLL
				     " [kernel-poll:%s]"
#endif	
#ifdef HYBRID
				     " [hybrid heap]"
#endif
#ifdef INCREMENTAL
				     " [incremental GC]"
#endif
#ifdef ET_DEBUG
#if ET_DEBUG
				     " [type-assertions]"
#endif
#endif	
#ifdef DEBUG
				     " [debug-compiled]"
#endif	
#ifdef ERTS_ENABLE_LOCK_CHECK
				     " [lock-checking]"
#endif
#ifdef ERTS_ENABLE_LOCK_COUNT
				     " [lock-counting]"
#endif
#ifdef PURIFY
				     " [purify-compiled]"
#endif	
#ifdef VALGRIND
				     " [valgrind-compiled]"
#endif
				     "\n");

#define ASIZE(a) (sizeof(a)/sizeof(a[0]))

#if defined(HAVE_SOLARIS_SPARC_PERFMON)
# include <sys/ioccom.h>
# define PERFMON_SETPCR			_IOW('P', 1, unsigned long long)
# define PERFMON_GETPCR			_IOR('P', 2, unsigned long long)
#endif

static Eterm
bld_bin_list(Uint **hpp, Uint *szp, ProcBin* pb)
{
    Eterm res = NIL;
    Eterm tuple;

    for (; pb; pb = pb->next) {
	Eterm val = erts_bld_uword(hpp, szp, (UWord) pb->val);
	Eterm orig_size = erts_bld_uint(hpp, szp, pb->val->orig_size);

	if (szp)
	    *szp += 4+2;
	if (hpp) {
	    Uint refc = (Uint) erts_smp_atomic_read(&pb->val->refc);
	    tuple = TUPLE3(*hpp, val, orig_size, make_small(refc));
	    res = CONS(*hpp + 4, tuple, res);
	    *hpp += 4+2;
	}
    }
    return res;
}


/*
  make_monitor_list:
  returns a list of records..
  -record(erl_monitor, {
            type, % MON_ORIGIN or MON_TARGET (1 or 3)
	    ref,
	    pid, % Process or nodename
	    name % registered name or []
          }).
*/

static void do_calc_mon_size(ErtsMonitor *mon, void *vpsz)
{
    Uint *psz = vpsz;
    *psz += IS_CONST(mon->ref) ? 0 : NC_HEAP_SIZE(mon->ref);
    *psz += IS_CONST(mon->pid) ? 0 : NC_HEAP_SIZE(mon->pid);
    *psz += 8; /* CONS + 5-tuple */ 
}

typedef struct {
    Process *p;
    Eterm *hp;
    Eterm res;
    Eterm tag;
} MonListContext;

static void do_make_one_mon_element(ErtsMonitor *mon, void * vpmlc)
{
    MonListContext *pmlc = vpmlc;
    Eterm tup;
    Eterm r = (IS_CONST(mon->ref)
	       ? mon->ref
	       : STORE_NC(&(pmlc->hp), &MSO(pmlc->p).externals, mon->ref));
    Eterm p = (IS_CONST(mon->pid)
	       ? mon->pid
	       : STORE_NC(&(pmlc->hp), &MSO(pmlc->p).externals, mon->pid));
    tup = TUPLE5(pmlc->hp, pmlc->tag, make_small(mon->type), r, p, mon->name);
    pmlc->hp += 6;
    pmlc->res = CONS(pmlc->hp, tup, pmlc->res);
    pmlc->hp += 2;
}

static Eterm 
make_monitor_list(Process *p, ErtsMonitor *root)
{
    DECL_AM(erl_monitor);
    Uint sz = 0;
    MonListContext mlc;

    erts_doforall_monitors(root, &do_calc_mon_size, &sz);
    if (sz == 0) {
	return NIL;
    }
    mlc.p = p;
    mlc.hp = HAlloc(p,sz);
    mlc.res = NIL;
    mlc.tag = AM_erl_monitor;
    erts_doforall_monitors(root, &do_make_one_mon_element, &mlc);
    return mlc.res;
}

/*
  make_link_list:
  returns a list of records..
  -record(erl_link, {
            type, % LINK_NODE or LINK_PID (1 or 3)
	    pid, % Process or nodename
	    targets % List of erl_link's or nil
          }).
*/

static void do_calc_lnk_size(ErtsLink *lnk, void *vpsz)
{
    Uint *psz = vpsz;
    *psz += IS_CONST(lnk->pid) ? 0 : NC_HEAP_SIZE(lnk->pid);
    if (lnk->type != LINK_NODE && ERTS_LINK_ROOT(lnk) != NULL) { 
	/* Node links use this pointer as ref counter... */
	erts_doforall_links(ERTS_LINK_ROOT(lnk),&do_calc_lnk_size,vpsz);
    }
    *psz += 7; /* CONS + 4-tuple */ 
}

typedef struct {
    Process *p;
    Eterm *hp;
    Eterm res;
    Eterm tag;
} LnkListContext;

static void do_make_one_lnk_element(ErtsLink *lnk, void * vpllc)
{
    LnkListContext *pllc = vpllc;
    Eterm tup;
    Eterm old_res, targets = NIL;
    Eterm p = (IS_CONST(lnk->pid)
	       ? lnk->pid
	       : STORE_NC(&(pllc->hp), &MSO(pllc->p).externals, lnk->pid));
    if (lnk->type == LINK_NODE) {
	targets = make_small(ERTS_LINK_REFC(lnk));
    } else if (ERTS_LINK_ROOT(lnk) != NULL) {
	old_res = pllc->res;
	pllc->res = NIL;
	erts_doforall_links(ERTS_LINK_ROOT(lnk),&do_make_one_lnk_element, vpllc);
	targets = pllc->res;
	pllc->res = old_res;
    }
    tup = TUPLE4(pllc->hp, pllc->tag, make_small(lnk->type), p, targets);
    pllc->hp += 5;
    pllc->res = CONS(pllc->hp, tup, pllc->res);
    pllc->hp += 2;
}

static Eterm 
make_link_list(Process *p, ErtsLink *root, Eterm tail)
{
    DECL_AM(erl_link);
    Uint sz = 0;
    LnkListContext llc;

    erts_doforall_links(root, &do_calc_lnk_size, &sz);
    if (sz == 0) {
	return tail;
    }
    llc.p = p;
    llc.hp = HAlloc(p,sz);
    llc.res = tail;
    llc.tag = AM_erl_link;
    erts_doforall_links(root, &do_make_one_lnk_element, &llc);
    return llc.res;
}

int
erts_print_system_version(int to, void *arg, Process *c_p)
{
#ifdef ERTS_SMP
    Uint total, online, active;
    (void) erts_schedulers_state(&total, &online, &active, 0);
#endif
    return erts_print(to, arg, erts_system_version
#ifdef ERTS_SMP
		      , total, online, erts_no_run_queues
#else
		      , 1
#endif
#ifdef USE_THREADS
		      , erts_async_max_threads
#endif
#ifdef ERTS_ENABLE_KERNEL_POLL
		      , erts_use_kernel_poll ? "true" : "false"
#endif
	);
}

typedef struct {
    Eterm entity;
    Eterm node;
} MonitorInfo;

typedef struct {
    MonitorInfo *mi;
    Uint mi_i;
    Uint mi_max;
    int sz;
} MonitorInfoCollection;

#define INIT_MONITOR_INFOS(MIC) do {		\
    (MIC).mi = NULL;				\
    (MIC).mi_i = (MIC).mi_max = 0;		\
    (MIC).sz = 0;                               \
} while(0)

#define MI_INC 50
#define EXTEND_MONITOR_INFOS(MICP)					\
do {									\
    if ((MICP)->mi_i >= (MICP)->mi_max) {				\
	(MICP)->mi = ((MICP)->mi ? erts_realloc(ERTS_ALC_T_TMP,		\
						(MICP)->mi,		\
						((MICP)->mi_max+MI_INC)	\
						* sizeof(MonitorInfo))	\
		      : erts_alloc(ERTS_ALC_T_TMP,			\
				   MI_INC*sizeof(MonitorInfo)));	\
	(MICP)->mi_max += MI_INC;					\
    }									\
 } while (0)
#define DESTROY_MONITOR_INFOS(MIC)			\
do {							\
    if ((MIC).mi != NULL) {				\
	erts_free(ERTS_ALC_T_TMP, (void *) (MIC).mi);	\
    }							\
 } while (0)

static void collect_one_link(ErtsLink *lnk, void *vmicp)
{
    MonitorInfoCollection *micp = vmicp;
    EXTEND_MONITOR_INFOS(micp);
    if (!(lnk->type == LINK_PID)) {
	return;
    }
    micp->mi[micp->mi_i].entity = lnk->pid;
    micp->sz += 2 + NC_HEAP_SIZE(lnk->pid);
    micp->mi_i++;
} 

static void collect_one_origin_monitor(ErtsMonitor *mon, void *vmicp)
{
    MonitorInfoCollection *micp = vmicp;
 
    if (mon->type != MON_ORIGIN) {
	return;
    }
    EXTEND_MONITOR_INFOS(micp);
    if (is_atom(mon->pid)) { /* external by name */
	micp->mi[micp->mi_i].entity = mon->name;
	micp->mi[micp->mi_i].node = mon->pid;
	micp->sz += 3; /* need one 2-tuple */
    } else if (is_external_pid(mon->pid)) { /* external by pid */
	micp->mi[micp->mi_i].entity = mon->pid;
	micp->mi[micp->mi_i].node = NIL;
	micp->sz += NC_HEAP_SIZE(mon->pid);
    } else if (!is_nil(mon->name)) { /* internal by name */
	micp->mi[micp->mi_i].entity = mon->name;
	micp->mi[micp->mi_i].node = erts_this_dist_entry->sysname;
	micp->sz += 3; /* need one 2-tuple */
    } else { /* internal by pid */
	micp->mi[micp->mi_i].entity = mon->pid;
	micp->mi[micp->mi_i].node = NIL;
	/* no additional heap space needed */
    }
    micp->mi_i++;
    micp->sz += 2 + 3; /* For a cons cell and a 2-tuple */
}

static void collect_one_target_monitor(ErtsMonitor *mon, void *vmicp)
{
    MonitorInfoCollection *micp = vmicp;
 
    if (mon->type != MON_TARGET) {
	return;
    }

    EXTEND_MONITOR_INFOS(micp);
  
    micp->mi[micp->mi_i].node = NIL;
    micp->mi[micp->mi_i].entity = mon->pid;
    micp->sz += (NC_HEAP_SIZE(mon->pid) + 2 /* cons */);
    micp->mi_i++;
}

typedef struct {
    Process *c_p;
    ErtsProcLocks c_p_locks;
    ErtsSuspendMonitor **smi;
    Uint smi_i;
    Uint smi_max;
    int sz;
} ErtsSuspendMonitorInfoCollection;

#define ERTS_INIT_SUSPEND_MONITOR_INFOS(SMIC, CP, CPL) do {		\
    (SMIC).c_p = (CP);							\
    (SMIC).c_p_locks = (CPL);						\
    (SMIC).smi = NULL;							\
    (SMIC).smi_i = (SMIC).smi_max = 0;					\
    (SMIC).sz = 0;                               			\
} while(0)

#define ERTS_SMI_INC 50
#define ERTS_EXTEND_SUSPEND_MONITOR_INFOS(SMICP)			\
do {									\
    if ((SMICP)->smi_i >= (SMICP)->smi_max) {				\
	(SMICP)->smi = ((SMICP)->smi					\
			? erts_realloc(ERTS_ALC_T_TMP,			\
				       (SMICP)->smi,			\
				       ((SMICP)->smi_max		\
					+ ERTS_SMI_INC)			\
				       * sizeof(ErtsSuspendMonitor *))	\
			: erts_alloc(ERTS_ALC_T_TMP,			\
				     ERTS_SMI_INC			\
				     * sizeof(ErtsSuspendMonitor *)));	\
	(SMICP)->smi_max += ERTS_SMI_INC;				\
    }									\
 } while (0)

#define ERTS_DESTROY_SUSPEND_MONITOR_INFOS(SMIC)			\
do {									\
    if ((SMIC).smi != NULL) {						\
	erts_free(ERTS_ALC_T_TMP, (void *) (SMIC).smi);			\
    }									\
 } while (0)

static void
collect_one_suspend_monitor(ErtsSuspendMonitor *smon, void *vsmicp)
{
    ErtsSuspendMonitorInfoCollection *smicp = vsmicp;
    Process *suspendee = erts_pid2proc(smicp->c_p,
				       smicp->c_p_locks,
				       smon->pid,
				       0);
    if (suspendee) { /* suspendee is alive */
	Sint a, p;
	if (smon->active) {
	    smon->active += smon->pending;
	    smon->pending = 0;
	}

	ASSERT((smon->active && !smon->pending)
	       || (smon->pending && !smon->active));

	ERTS_EXTEND_SUSPEND_MONITOR_INFOS(smicp);

	smicp->smi[smicp->smi_i] = smon;
	smicp->sz += 2 /* cons */ + 4 /* 3-tuple */;

	a = (Sint) smon->active;	/* quiet compiler warnings */
	p = (Sint) smon->pending;	/* on 64-bit machines      */

	if (!IS_SSMALL(a))
	    smicp->sz += BIG_UINT_HEAP_SIZE;
	if (!IS_SSMALL(p))
	    smicp->sz += BIG_UINT_HEAP_SIZE;
	smicp->smi_i++;
    }
}


static void one_link_size(ErtsLink *lnk, void *vpu)
{
    Uint *pu = vpu;
    *pu += ERTS_LINK_SIZE*sizeof(Uint);
    if(!IS_CONST(lnk->pid))
	*pu += NC_HEAP_SIZE(lnk->pid)*sizeof(Uint);
    if (lnk->type != LINK_NODE && ERTS_LINK_ROOT(lnk) != NULL) {
	erts_doforall_links(ERTS_LINK_ROOT(lnk),&one_link_size,vpu);
    }
}
static void one_mon_size(ErtsMonitor *mon, void *vpu)
{
    Uint *pu = vpu;
    *pu += ERTS_MONITOR_SIZE*sizeof(Uint);
    if(!IS_CONST(mon->pid))
	*pu += NC_HEAP_SIZE(mon->pid)*sizeof(Uint);
    if(!IS_CONST(mon->ref))
	*pu += NC_HEAP_SIZE(mon->ref)*sizeof(Uint);
}

/*
 * process_info/[1,2]
 */

#define ERTS_PI_FAIL_TYPE_BADARG		0
#define ERTS_PI_FAIL_TYPE_YIELD			1
#define ERTS_PI_FAIL_TYPE_AWAIT_EXIT		2

static ERTS_INLINE ErtsProcLocks
pi_locks(Eterm info)
{
    switch (info) {
    case am_status:
    case am_priority:
	return ERTS_PROC_LOCK_STATUS;
    case am_links:
    case am_monitors:
    case am_monitored_by:
    case am_suspending:
	return ERTS_PROC_LOCK_LINK;
    case am_messages:
    case am_message_queue_len:
    case am_total_heap_size:
	return ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_MSGQ;
    case am_memory:
	return ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_MSGQ;
    default:
	return ERTS_PROC_LOCK_MAIN;
    }
}

/*
 * All valid process_info arguments.
 */
static Eterm pi_args[] = {
    am_registered_name,
    am_current_function,
    am_initial_call,
    am_status,
    am_messages,
    am_message_queue_len,
    am_links,
    am_monitors,
    am_monitored_by,
    am_dictionary,
    am_trap_exit,
    am_error_handler,
    am_heap_size,
    am_stack_size,
    am_memory,
    am_garbage_collection,
    am_group_leader,
    am_reductions,
    am_priority,
    am_trace,
    am_binary,
    am_sequential_trace_token,
    am_catchlevel,
    am_backtrace,
    am_last_calls,
    am_total_heap_size,
    am_suspending,
    am_min_heap_size,
    am_min_bin_vheap_size,
#ifdef HYBRID
    am_message_binary
#endif
};    

#define ERTS_PI_ARGS ((int) (sizeof(pi_args)/sizeof(Eterm)))

static ERTS_INLINE Eterm
pi_ix2arg(int ix)
{
    if (ix < 0 || ERTS_PI_ARGS <= ix)
	return am_undefined;
    return pi_args[ix];
}

static ERTS_INLINE int
pi_arg2ix(Eterm arg)
{
    switch (arg) {
    case am_registered_name:			return 0;
    case am_current_function:			return 1;
    case am_initial_call:			return 2;
    case am_status:				return 3;
    case am_messages:				return 4;
    case am_message_queue_len:			return 5;
    case am_links:				return 6;
    case am_monitors:				return 7;
    case am_monitored_by:			return 8;
    case am_dictionary:				return 9;
    case am_trap_exit:				return 10;
    case am_error_handler:			return 11;
    case am_heap_size:				return 12;
    case am_stack_size:				return 13;
    case am_memory:				return 14;
    case am_garbage_collection:			return 15;
    case am_group_leader:			return 16;
    case am_reductions:				return 17;
    case am_priority:				return 18;
    case am_trace:				return 19;
    case am_binary:				return 20;
    case am_sequential_trace_token:		return 21;
    case am_catchlevel:				return 22;
    case am_backtrace:				return 23;
    case am_last_calls:				return 24;
    case am_total_heap_size:			return 25;
    case am_suspending:				return 26;
    case am_min_heap_size:			return 27;
    case am_min_bin_vheap_size:			return 28;
#ifdef HYBRID
    case am_message_binary:			return 29;
#endif
    default:					return -1;
    }
}

static Eterm pi_1_keys[] = {
    am_registered_name,
    am_current_function,
    am_initial_call,
    am_status,
    am_message_queue_len,
    am_messages,
    am_links,
    am_dictionary,
    am_trap_exit,
    am_error_handler,
    am_priority,
    am_group_leader,
    am_total_heap_size,
    am_heap_size,
    am_stack_size,
    am_reductions,
    am_garbage_collection,
    am_suspending
};

#define ERTS_PI_1_NO_OF_KEYS (sizeof(pi_1_keys)/sizeof(Eterm))

static Eterm pi_1_keys_list;
#if HEAP_ON_C_STACK
static Eterm pi_1_keys_list_heap[2*ERTS_PI_1_NO_OF_KEYS];
#endif

static void
process_info_init(void)
{
#if HEAP_ON_C_STACK
    Eterm *hp = &pi_1_keys_list_heap[0];
#else
    Eterm *hp = erts_alloc(ERTS_ALC_T_LL_TEMP_TERM,sizeof(Eterm)*2*ERTS_PI_1_NO_OF_KEYS);
#endif
    int i;

    pi_1_keys_list = NIL;

    for (i = ERTS_PI_1_NO_OF_KEYS-1; i >= 0; i--) {
	pi_1_keys_list = CONS(hp, pi_1_keys[i], pi_1_keys_list);
	hp += 2;
    }

#ifdef DEBUG
    { /* Make sure the process_info argument mappings are consistent */
	int ix;
	for (ix = 0; ix < ERTS_PI_ARGS; ix++) {
	    ASSERT(pi_arg2ix(pi_ix2arg(ix)) == ix);
	}
    }
#endif

}

static ERTS_INLINE Process *
pi_pid2proc(Process *c_p, Eterm pid, ErtsProcLocks info_locks)
{
#ifdef ERTS_SMP
    /*
     * If the main lock is needed, we use erts_pid2proc_not_running()
     * instead of erts_pid2proc() for two reasons:
     * * Current function of pid and possibly other information will
     *   have been updated so that process_info() is consistent with an
     *   info-request/info-response signal model.
     * * We avoid blocking the whole scheduler executing the
     *   process that is calling process_info() for a long time
     *   which will happen if pid is currently running.
     * The caller of process_info() may have to yield if pid
     * is currently running.
     */

    if (info_locks & ERTS_PROC_LOCK_MAIN)
	return erts_pid2proc_not_running(c_p, ERTS_PROC_LOCK_MAIN,
					 pid, info_locks);
    else
#endif
	return erts_pid2proc(c_p, ERTS_PROC_LOCK_MAIN,
			     pid, info_locks);
}



BIF_RETTYPE
process_info_aux(Process *BIF_P,
		 Process *rp,
		 Eterm rpid,
		 Eterm item,
		 int always_wrap);

#define ERTS_PI_RES_ELEM_IX_BUF_INC 1024
#define ERTS_PI_DEF_RES_ELEM_IX_BUF_SZ ERTS_PI_ARGS

static Eterm
process_info_list(Process *c_p, Eterm pid, Eterm list, int always_wrap,
		  int *fail_type)
{
    int want_messages = 0;
    int def_res_elem_ix_buf[ERTS_PI_DEF_RES_ELEM_IX_BUF_SZ];
    int *res_elem_ix = &def_res_elem_ix_buf[0];
    int res_elem_ix_ix = -1;
    int res_elem_ix_sz = ERTS_PI_DEF_RES_ELEM_IX_BUF_SZ;
    Eterm part_res[ERTS_PI_ARGS];
    Eterm res, arg;
    Uint *hp, *hp_end;
    ErtsProcLocks locks = (ErtsProcLocks) 0;
    int res_len, ix;
    Process *rp = NULL;

    *fail_type = ERTS_PI_FAIL_TYPE_BADARG;

    for (ix = 0; ix < ERTS_PI_ARGS; ix++)
	part_res[ix] = THE_NON_VALUE;

    ASSERT(is_list(list));

    while (is_list(list)) {
	Eterm* consp = list_val(list);

	arg = CAR(consp);
	ix = pi_arg2ix(arg);
	if (ix < 0) {
	    res = THE_NON_VALUE;
	    goto done;
	}
	if (arg == am_messages)
	    want_messages = 1;
	locks |= pi_locks(arg);
	res_elem_ix_ix++;
	if (res_elem_ix_ix >= res_elem_ix_sz) {
	    if (res_elem_ix != &def_res_elem_ix_buf[0])
		res_elem_ix =
		    erts_realloc(ERTS_ALC_T_TMP,
				 res_elem_ix,
				 sizeof(int)*(res_elem_ix_sz
					      += ERTS_PI_RES_ELEM_IX_BUF_INC));
	    else {
		int new_res_elem_ix_sz = ERTS_PI_RES_ELEM_IX_BUF_INC;
		int *new_res_elem_ix = erts_alloc(ERTS_ALC_T_TMP,
						  sizeof(int)*new_res_elem_ix_sz);
		sys_memcpy((void *) new_res_elem_ix,
			   (void *) res_elem_ix,
			   sizeof(int)*res_elem_ix_sz);
		res_elem_ix = new_res_elem_ix;
		res_elem_ix_sz = new_res_elem_ix_sz;
	    }
	}
	res_elem_ix[res_elem_ix_ix] = ix;
	list = CDR(consp);
    }
    if (is_not_nil(list)) {
	res = THE_NON_VALUE;
	goto done;
    }

    res_len = res_elem_ix_ix+1;

    ASSERT(res_len > 0);

    rp = pi_pid2proc(c_p, pid, locks|ERTS_PROC_LOCK_STATUS);
    if (!rp) {
	res = am_undefined;
	goto done;
    }
    else if (rp == ERTS_PROC_LOCK_BUSY) {
	rp = NULL;
	res = THE_NON_VALUE;
	*fail_type = ERTS_PI_FAIL_TYPE_YIELD;
	goto done;
    }
    else if (c_p != rp && ERTS_PROC_PENDING_EXIT(rp)) {
	locks |= ERTS_PROC_LOCK_STATUS;
	res = THE_NON_VALUE;
	*fail_type = ERTS_PI_FAIL_TYPE_AWAIT_EXIT;
	goto done;
    }
    else if (!(locks & ERTS_PROC_LOCK_STATUS)) {
	erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS);
    }
	

    /*
     * We always handle 'messages' first if it should be part
     * of the result. This since if both 'messages' and
     * 'message_queue_len' are wanted, 'messages' may
     * change the result of 'message_queue_len' (in case
     * the queue contain bad distribution messages).
     */
    if (want_messages) {
	ix = pi_arg2ix(am_messages);
	ASSERT(part_res[ix] == THE_NON_VALUE);
	part_res[ix] = process_info_aux(c_p, rp, pid, am_messages, always_wrap);
	ASSERT(part_res[ix] != THE_NON_VALUE);
    }

    for (; res_elem_ix_ix >= 0; res_elem_ix_ix--) {
	ix = res_elem_ix[res_elem_ix_ix];
	if (part_res[ix] == THE_NON_VALUE) {
	    arg = pi_ix2arg(ix);
	    part_res[ix] = process_info_aux(c_p, rp, pid, arg, always_wrap);
	    ASSERT(part_res[ix] != THE_NON_VALUE);
	}
    }

    hp = HAlloc(c_p, res_len*2);
    hp_end = hp + res_len*2;
    res = NIL;

    for (res_elem_ix_ix = res_len - 1; res_elem_ix_ix >= 0; res_elem_ix_ix--) {
	ix = res_elem_ix[res_elem_ix_ix];
	ASSERT(part_res[ix] != THE_NON_VALUE);
	/*
	 * If we should ignore the value of registered_name,
	 * its value is nil. For more info, see comment in the
	 * beginning of process_info_aux().
	 */
	if (is_nil(part_res[ix])) {
	    ASSERT(!always_wrap);
	    ASSERT(pi_ix2arg(ix) == am_registered_name);
	}
	else {
	    res = CONS(hp, part_res[ix], res);
	    hp += 2;
	}
    }

    if (!always_wrap) {
	HRelease(c_p, hp_end, hp);
    }

 done:

    if (c_p == rp)
	locks &= ~ERTS_PROC_LOCK_MAIN;
    if (locks && rp)
	erts_smp_proc_unlock(rp, locks);

    if (res_elem_ix != &def_res_elem_ix_buf[0])
	erts_free(ERTS_ALC_T_TMP, res_elem_ix);

    return res;
}

BIF_RETTYPE process_info_1(BIF_ALIST_1)
{
    Eterm res;
    int fail_type;

    if (is_external_pid(BIF_ARG_1)
	&& external_pid_dist_entry(BIF_ARG_1) == erts_this_dist_entry)
	BIF_RET(am_undefined);
	
    if (is_not_internal_pid(BIF_ARG_1)
	|| internal_pid_index(BIF_ARG_1) >= erts_max_processes) {
	BIF_ERROR(BIF_P, BADARG);
    }

    res = process_info_list(BIF_P, BIF_ARG_1, pi_1_keys_list, 0, &fail_type);
    if (is_non_value(res)) {
	switch (fail_type) {
	case ERTS_PI_FAIL_TYPE_BADARG:
	    BIF_ERROR(BIF_P, BADARG);
	case ERTS_PI_FAIL_TYPE_YIELD:
	    ERTS_BIF_YIELD1(bif_export[BIF_process_info_1], BIF_P, BIF_ARG_1);
	case ERTS_PI_FAIL_TYPE_AWAIT_EXIT:
	    ERTS_BIF_AWAIT_X_DATA_TRAP(BIF_P, BIF_ARG_1, am_undefined);
	default:
	    erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error", __FILE__, __LINE__);
	}
    }

    ASSERT(!(BIF_P->flags & F_P2PNR_RESCHED));
    BIF_RET(res);
}


BIF_RETTYPE process_info_2(BIF_ALIST_2) 
{
    Eterm res;
    Process *rp;
    Eterm pid = BIF_ARG_1;
    ErtsProcLocks info_locks;
    int fail_type;

    if (is_external_pid(pid)
	&& external_pid_dist_entry(pid) == erts_this_dist_entry)
	BIF_RET(am_undefined);
	
    if (is_not_internal_pid(pid)
	|| internal_pid_index(BIF_ARG_1) >= erts_max_processes) {
	BIF_ERROR(BIF_P, BADARG);
    }

    if (is_nil(BIF_ARG_2))
	BIF_RET(NIL);

    if (is_list(BIF_ARG_2)) {
	res = process_info_list(BIF_P, BIF_ARG_1, BIF_ARG_2, 1, &fail_type);
	if (is_non_value(res)) {
	    switch (fail_type) {
	    case ERTS_PI_FAIL_TYPE_BADARG:
		BIF_ERROR(BIF_P, BADARG);
	    case ERTS_PI_FAIL_TYPE_YIELD:
		ERTS_BIF_YIELD2(bif_export[BIF_process_info_2], BIF_P,
				BIF_ARG_1, BIF_ARG_2);
	    case ERTS_PI_FAIL_TYPE_AWAIT_EXIT:
		ERTS_BIF_AWAIT_X_DATA_TRAP(BIF_P, BIF_ARG_1, am_undefined);
	    default:
		erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error",
			 __FILE__, __LINE__);
	    }
	}
	ASSERT(!(BIF_P->flags & F_P2PNR_RESCHED));
	BIF_RET(res);
    }

    if (pi_arg2ix(BIF_ARG_2) < 0)
	BIF_ERROR(BIF_P, BADARG);

    info_locks = pi_locks(BIF_ARG_2); 

    rp = pi_pid2proc(BIF_P, pid, info_locks|ERTS_PROC_LOCK_STATUS);
    if (!rp)
	res = am_undefined;
    else if (rp == ERTS_PROC_LOCK_BUSY)
	ERTS_BIF_YIELD2(bif_export[BIF_process_info_2], BIF_P,
			BIF_ARG_1, BIF_ARG_2);
    else if (rp != BIF_P && ERTS_PROC_PENDING_EXIT(rp)) {
	erts_smp_proc_unlock(rp, info_locks|ERTS_PROC_LOCK_STATUS);
	ERTS_BIF_AWAIT_X_DATA_TRAP(BIF_P, BIF_ARG_1, am_undefined);
    }
    else {
	if (!(info_locks & ERTS_PROC_LOCK_STATUS))
	    erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS);
	res = process_info_aux(BIF_P, rp, pid, BIF_ARG_2, 0);
    }
    ASSERT(is_value(res));

#ifdef ERTS_SMP
    if (BIF_P == rp)
	info_locks &= ~ERTS_PROC_LOCK_MAIN;
    if (rp && info_locks)
	erts_smp_proc_unlock(rp, info_locks);
#endif

    ASSERT(!(BIF_P->flags & F_P2PNR_RESCHED));
    BIF_RET(res);
}

Eterm
process_info_aux(Process *BIF_P,
		 Process *rp,
		 Eterm rpid,
		 Eterm item,
		 int always_wrap)
{
    Eterm *hp;
    Eterm res = NIL;

    ASSERT(rp);

    /*
     * Q: Why this always_wrap argument?
     *
     * A: registered_name is strange. If process has no registered name,
     *    process_info(Pid, registered_name) returns [], and
     *    the result of process_info(Pid) has no {registered_name, Name}
     *    tuple in the resulting list. This is inconsistent with all other
     *    options, but we do not dare to change it.
     *
     *    When process_info/2 is called with a list as second argument,
     *    registered_name behaves as it should, i.e. a
     *    {registered_name, []} will appear in the resulting list.
     *
     *    If always_wrap != 0, process_info_aux() always wrap the result
     *    in a key two tuple. 
     */

    switch (item) {

    case am_registered_name:
	if (rp->reg != NULL) {
	    hp = HAlloc(BIF_P, 3);
	    res = rp->reg->name;
	} else {
	    if (always_wrap) {
		hp = HAlloc(BIF_P, 3);
		res = NIL;
	    }
	    else {
		return NIL;
	    }
	}
	break;

    case am_current_function:
	if (rp->current == NULL) {
	    rp->current = find_function_from_pc(rp->i);
	}
	if (rp->current == NULL) {
	    hp = HAlloc(BIF_P, 3);
	    res = am_undefined;
	} else {
	    BeamInstr* current;

	    if (rp->current[0] == am_erlang &&
		rp->current[1] == am_process_info &&
		(rp->current[2] == 1 || rp->current[2] == 2) &&
		(current = find_function_from_pc(rp->cp)) != NULL) {

		/*
		 * The current function is erlang:process_info/2,
		 * which is not the answer that the application want.
		 * We will use the function pointed into by rp->cp
		 * instead.
		 */

		rp->current = current;
	    }

	    hp = HAlloc(BIF_P, 3+4);
	    res = TUPLE3(hp, rp->current[0],
			 rp->current[1], make_small(rp->current[2]));
	    hp += 4;
	}
	break;

    case am_initial_call:
	hp = HAlloc(BIF_P, 3+4);
	res = TUPLE3(hp,
		     rp->initial[INITIAL_MOD],
		     rp->initial[INITIAL_FUN],
		     make_small(rp->initial[INITIAL_ARI]));
	hp += 4;
	break;

    case am_status:
	res = erts_process_status(BIF_P, ERTS_PROC_LOCK_MAIN, rp, rpid);
	ASSERT(res != am_undefined);
	hp = HAlloc(BIF_P, 3);
	break;

    case am_messages: {
	ErlMessage* mp;
	int n;

	ERTS_SMP_MSGQ_MV_INQ2PRIVQ(rp);
	n = rp->msg.len;

	if (n == 0 || rp->trace_flags & F_SENSITIVE) {
	    hp = HAlloc(BIF_P, 3);
	} else {
	    int remove_bad_messages = 0;
	    struct {
		Uint copy_struct_size;
		ErlMessage* msgp;
	    } *mq = erts_alloc(ERTS_ALC_T_TMP, n*sizeof(*mq));
	    Sint i = 0;
	    Uint heap_need = 3;
	    Eterm *hp_end;

	    for (mp = rp->msg.first; mp; mp = mp->next) {
		heap_need += 2;
		mq[i].msgp = mp;
		if (rp != BIF_P) {
		    Eterm msg = ERL_MESSAGE_TERM(mq[i].msgp);
		    if (is_value(msg)) {
			mq[i].copy_struct_size = (is_immed(msg)
#ifdef HYBRID
						  || NO_COPY(msg)
#endif
						  ? 0
						  : size_object(msg));
		    }
		    else if (mq[i].msgp->data.attached) {
			mq[i].copy_struct_size
			    = erts_msg_attached_data_size(mq[i].msgp);
		    }
		    else {
			/* Bad distribution message; ignore */
			remove_bad_messages = 1;
			mq[i].copy_struct_size = 0;
		    }
		    heap_need += mq[i].copy_struct_size;
		}
		else {
		    mq[i].copy_struct_size = 0;
		    if (mp->data.attached)
			heap_need += erts_msg_attached_data_size(mp);
		}
		i++;
	    }

	    hp = HAlloc(BIF_P, heap_need);
	    hp_end = hp + heap_need;
	    ASSERT(i == n);
	    for (i--; i >= 0; i--) {
		Eterm msg = ERL_MESSAGE_TERM(mq[i].msgp);
		if (rp != BIF_P) {
		    if (is_value(msg)) {
			if (mq[i].copy_struct_size)
			    msg = copy_struct(msg,
					      mq[i].copy_struct_size,
					      &hp,
					      &MSO(BIF_P));
		    }
		    else if (mq[i].msgp->data.attached) {
			ErlHeapFragment *hfp;
			/*
			 * Decode it into a message buffer and attach it
			 * to the message instead of the attached external
			 * term.
			 *
			 * Note that we may not pass a process pointer
			 * to erts_msg_distext2heap(), since it would then
			 * try to alter locks on that process.
			 */
			msg = erts_msg_distext2heap(
			    NULL, NULL, &hfp, &ERL_MESSAGE_TOKEN(mq[i].msgp),
			    mq[i].msgp->data.dist_ext);

			ERL_MESSAGE_TERM(mq[i].msgp) = msg;
			mq[i].msgp->data.heap_frag = hfp;

			if (is_non_value(msg)) {
			    ASSERT(!mq[i].msgp->data.heap_frag);
			    /* Bad distribution message; ignore */
			    remove_bad_messages = 1;
			    continue;
			}
			else {
			    /* Make our copy of the message */
			    ASSERT(size_object(msg) == hfp->used_size);
			    msg = copy_struct(msg,
					      hfp->used_size,
					      &hp,
					      &MSO(BIF_P));
			}
		    }
		    else {
			/* Bad distribution message; ignore */
			remove_bad_messages = 1;
			continue;
		    }
		}
		else {
		    if (mq[i].msgp->data.attached) {
			/* Decode it on the heap */
			erts_move_msg_attached_data_to_heap(&hp,
							    &MSO(BIF_P),
							    mq[i].msgp);
			msg = ERL_MESSAGE_TERM(mq[i].msgp);
			ASSERT(!mq[i].msgp->data.attached);
			if (is_non_value(msg)) {
			    /* Bad distribution message; ignore */
			    remove_bad_messages = 1;
			    continue;
			}
		    }
		}
		    
		res = CONS(hp, msg, res);
		hp += 2;
	    }
	    HRelease(BIF_P, hp_end, hp+3);
	    erts_free(ERTS_ALC_T_TMP, mq);
	    if (remove_bad_messages) {
		ErlMessage **mpp;
		/*
		 * We need to remove bad distribution messages from
		 * the queue, so that the value returned for
		 * 'message_queue_len' is consistent with the value
		 * returned for 'messages'.
		 */
		mpp = &rp->msg.first;
		mp = rp->msg.first;
		while (mp) {
		    if (is_value(ERL_MESSAGE_TERM(mp))) {
			mpp = &mp->next;
			mp = mp->next;
		    }
		    else {
			ErlMessage* bad_mp = mp;
			ASSERT(!mp->data.attached);
			if (rp->msg.save == &mp->next)
			    rp->msg.save = mpp;
			if (rp->msg.last == &mp->next)
			    rp->msg.last = mpp;
			*mpp = mp->next;
			mp = mp->next;
			rp->msg.len--;
			free_message(bad_mp);
		    }
		}
	    }
	}
	break;
    }

    case am_message_queue_len:
	hp = HAlloc(BIF_P, 3);
	ERTS_SMP_MSGQ_MV_INQ2PRIVQ(rp);
	res = make_small(rp->msg.len);
	break;

    case am_links: {
	MonitorInfoCollection mic;
	int i;
	Eterm item;

	INIT_MONITOR_INFOS(mic);

	erts_doforall_links(rp->nlinks,&collect_one_link,&mic);

	hp = HAlloc(BIF_P, 3 + mic.sz);
	res = NIL;
	for (i = 0; i < mic.mi_i; i++) {
	    item = STORE_NC(&hp, &MSO(BIF_P).externals, mic.mi[i].entity); 
	    res = CONS(hp, item, res);
	    hp += 2;
	}
	DESTROY_MONITOR_INFOS(mic);
	break;
    }

    case am_monitors: {
	MonitorInfoCollection mic;
	int i;

	INIT_MONITOR_INFOS(mic);
	erts_doforall_monitors(rp->monitors,&collect_one_origin_monitor,&mic);
	hp = HAlloc(BIF_P, 3 + mic.sz);
	res = NIL;
	for (i = 0; i < mic.mi_i; i++) {
	    if (is_atom(mic.mi[i].entity)) {
		/* Monitor by name. 
		 * Build {process, {Name, Node}} and cons it. 
		 */
		Eterm t1, t2;

		t1 = TUPLE2(hp, mic.mi[i].entity, mic.mi[i].node);
		hp += 3;
		t2 = TUPLE2(hp, am_process, t1);
		hp += 3;
		res = CONS(hp, t2, res);
		hp += 2;
	    }
	    else {
		/* Monitor by pid. Build {process, Pid} and cons it. */
		Eterm t;
		Eterm pid = STORE_NC(&hp,
				     &MSO(BIF_P).externals,
				     mic.mi[i].entity);
		t = TUPLE2(hp, am_process, pid);
		hp += 3;
		res = CONS(hp, t, res);
		hp += 2;
	    }
	}
	DESTROY_MONITOR_INFOS(mic);
	break;
    }

    case am_monitored_by: {
	MonitorInfoCollection mic;
	int i;
	Eterm item;

	INIT_MONITOR_INFOS(mic);
	erts_doforall_monitors(rp->monitors,&collect_one_target_monitor,&mic);
	hp = HAlloc(BIF_P, 3 + mic.sz);

	res = NIL;
	for (i = 0; i < mic.mi_i; ++i) {
	    item = STORE_NC(&hp, &MSO(BIF_P).externals, mic.mi[i].entity); 
	    res = CONS(hp, item, res);
	    hp += 2;
	}
	DESTROY_MONITOR_INFOS(mic);
	break;
    }

    case am_suspending: {
	ErtsSuspendMonitorInfoCollection smic;
	int i;
	Eterm item;
#ifdef DEBUG
	Eterm *hp_end;
#endif

	ERTS_INIT_SUSPEND_MONITOR_INFOS(smic,
					BIF_P,
					(BIF_P == rp
					 ? ERTS_PROC_LOCK_MAIN
					 : 0) | ERTS_PROC_LOCK_LINK);

	erts_doforall_suspend_monitors(rp->suspend_monitors,
				       &collect_one_suspend_monitor,
				       &smic);
	hp = HAlloc(BIF_P, 3 + smic.sz);
#ifdef DEBUG
	hp_end = hp + smic.sz;
#endif
	
	res = NIL;
	for (i = 0; i < smic.smi_i; i++) {
	    Sint a = (Sint) smic.smi[i]->active;  /* quiet compiler warnings */
	    Sint p = (Sint) smic.smi[i]->pending; /* on 64-bit machines...   */
	    Eterm active;
	    Eterm pending;
	    if (IS_SSMALL(a))
		active = make_small(a);
	    else {
		active = small_to_big(a, hp);
		hp += BIG_UINT_HEAP_SIZE;
	    }
	    if (IS_SSMALL(p))
		pending = make_small(p);
	    else {
		pending = small_to_big(p, hp);
		hp += BIG_UINT_HEAP_SIZE;
	    }
	    item = TUPLE3(hp, smic.smi[i]->pid, active, pending);
	    hp += 4;
	    res = CONS(hp, item, res);
	    hp += 2;
	}

	ERTS_DESTROY_SUSPEND_MONITOR_INFOS(smic);
	ASSERT(hp == hp_end);

	break;
    }

    case am_dictionary:
	if (rp->trace_flags & F_SENSITIVE) {
	    res = NIL;
	} else {
	    res = erts_dictionary_copy(BIF_P, rp->dictionary);
	}
	hp = HAlloc(BIF_P, 3);
	break;

    case am_trap_exit:
	hp = HAlloc(BIF_P, 3);
	if (rp->flags  & F_TRAPEXIT)
	    res = am_true;
	else
	    res = am_false;
	break;

    case am_error_handler:
	hp = HAlloc(BIF_P, 3);
	res = erts_proc_get_error_handler(BIF_P);
	break;

    case am_heap_size: {
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, HEAP_SIZE(rp));
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, HEAP_SIZE(rp));
	break;
    }

    case am_fullsweep_after: {
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, MAX_GEN_GCS(rp));
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, MAX_GEN_GCS(rp));
	break;
    }

    case am_min_heap_size: {
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, MIN_HEAP_SIZE(rp));
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, MIN_HEAP_SIZE(rp));
	break;
    }

    case am_min_bin_vheap_size: {
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, MIN_VHEAP_SIZE(rp));
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, MIN_VHEAP_SIZE(rp));
	break;
    }

    case am_total_heap_size: {
	ErlMessage *mp;
	Uint total_heap_size;
	Uint hsz = 3;

	total_heap_size = rp->heap_sz;
	if (rp->old_hend && rp->old_heap)
	    total_heap_size += rp->old_hend - rp->old_heap;

	total_heap_size += rp->mbuf_sz;

	ERTS_SMP_MSGQ_MV_INQ2PRIVQ(rp);

	for (mp = rp->msg.first; mp; mp = mp->next)
	    if (mp->data.attached)
		total_heap_size += erts_msg_attached_data_size(mp);

	(void) erts_bld_uint(NULL, &hsz, total_heap_size);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, total_heap_size);
	break;
    }

    case am_stack_size: {
	Uint stack_size = STACK_START(rp) - rp->stop;
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, stack_size);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, stack_size);
	break;
    }

    case am_memory: { /* Memory consumed in bytes */
	ErlMessage *mp;
	Uint size = 0;
	Uint hsz = 3;
	struct saved_calls *scb;
	size += sizeof(Process);

	ERTS_SMP_MSGQ_MV_INQ2PRIVQ(rp);

	erts_doforall_links(rp->nlinks, &one_link_size, &size);
	erts_doforall_monitors(rp->monitors, &one_mon_size, &size);
	size += (rp->heap_sz + rp->mbuf_sz) * sizeof(Eterm);
	if (rp->old_hend && rp->old_heap)
	    size += (rp->old_hend - rp->old_heap) * sizeof(Eterm);

	size += rp->msg.len * sizeof(ErlMessage);

	for (mp = rp->msg.first; mp; mp = mp->next)
	    if (mp->data.attached)
		size += erts_msg_attached_data_size(mp)*sizeof(Eterm);

	if (rp->arg_reg != rp->def_arg_reg) {
	    size += rp->arity * sizeof(rp->arg_reg[0]);
	}

	if (rp->psd)
	    size += sizeof(ErtsPSD);

	scb = ERTS_PROC_GET_SAVED_CALLS_BUF(rp);
	if (scb) {
	    size += (sizeof(struct saved_calls)
		     + (scb->len-1) * sizeof(scb->ct[0]));
	}

	size += erts_dicts_mem_size(rp);

	(void) erts_bld_uint(NULL, &hsz, size);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, size);
	break;
    }

    case am_garbage_collection: {
        DECL_AM(minor_gcs);
        Eterm t;

	hp = HAlloc(BIF_P, 3+2 + 3+2 + 3+2 + 3+2 + 3); /* last "3" is for outside tuple */

	t = TUPLE2(hp, AM_minor_gcs, make_small(GEN_GCS(rp))); hp += 3;
	res = CONS(hp, t, NIL); hp += 2;
	t = TUPLE2(hp, am_fullsweep_after, make_small(MAX_GEN_GCS(rp))); hp += 3;
	res = CONS(hp, t, res); hp += 2;

	t = TUPLE2(hp, am_min_heap_size, make_small(MIN_HEAP_SIZE(rp))); hp += 3;
	res = CONS(hp, t, res); hp += 2;
	t = TUPLE2(hp, am_min_bin_vheap_size, make_small(MIN_VHEAP_SIZE(rp))); hp += 3;
	res = CONS(hp, t, res); hp += 2;
	break;
    }

    case am_group_leader: {
	int sz = NC_HEAP_SIZE(rp->group_leader);
	hp = HAlloc(BIF_P, 3 + sz);
	res = STORE_NC(&hp, &MSO(BIF_P).externals, rp->group_leader);
	break;
    }

    case am_reductions: {
	Uint reds = rp->reds + erts_current_reductions(BIF_P, rp);
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, reds);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, reds);
	break;
    }

    case am_priority:
	hp = HAlloc(BIF_P, 3);
	res = erts_get_process_priority(rp);
	break;

    case am_trace:
	hp = HAlloc(BIF_P, 3);
	res = make_small(rp->trace_flags & TRACEE_FLAGS);
	break;

    case am_binary: {
	Uint sz = 3;
	(void) bld_bin_list(NULL, &sz, MSO(rp).mso);
	hp = HAlloc(BIF_P, sz);
	res = bld_bin_list(&hp, NULL, MSO(rp).mso);
	break;
    }

#ifdef HYBRID
    case am_message_binary: {
	Uint sz = 3;
	(void) bld_bin_list(NULL, &sz, erts_global_offheap.mso);
	hp = HAlloc(BIF_P, sz);
	res = bld_bin_list(&hp, NULL, erts_global_offheap.mso);
	break;
    }
#endif

    case am_sequential_trace_token:
	res = copy_object(rp->seq_trace_token, BIF_P);
	hp = HAlloc(BIF_P, 3);
	break;

    case am_catchlevel:
	hp = HAlloc(BIF_P, 3);
	res = make_small(catchlevel(BIF_P));
	break;

    case am_backtrace: {
	erts_dsprintf_buf_t *dsbufp = erts_create_tmp_dsbuf(0);
	erts_stack_dump(ERTS_PRINT_DSBUF, (void *) dsbufp, rp);
	res = new_binary(BIF_P, (byte *) dsbufp->str, (int) dsbufp->str_len);
	erts_destroy_tmp_dsbuf(dsbufp);
	hp = HAlloc(BIF_P, 3);
	break;
    }

    case am_last_calls: {
	struct saved_calls *scb = ERTS_PROC_GET_SAVED_CALLS_BUF(BIF_P);
	if (!scb) {
	    hp = HAlloc(BIF_P, 3);
	    res = am_false;
	} else {
	    /*
	     * One cons cell and a 3-struct, and a 2-tuple.
	     * Might be less than that, if there are sends, receives or timeouts,
	     * so we must do a HRelease() to avoid creating holes.
	     */
	    Uint needed = scb->n*(2+4) + 3;
	    Eterm* limit;
	    Eterm term, list;
	    int i, j;

	    hp = HAlloc(BIF_P, needed);
	    limit = hp + needed;
	    list = NIL;
	    for (i = 0; i < scb->n; i++) {
		j = scb->cur - i - 1;
		if (j < 0)
		    j += scb->len;
		if (scb->ct[j] == &exp_send)
		    term = am_send;
		else if (scb->ct[j] == &exp_receive)
		    term = am_receive;
		else if (scb->ct[j] == &exp_timeout)
		    term = am_timeout;
		else {
		    term = TUPLE3(hp,
				  scb->ct[j]->code[0],
				  scb->ct[j]->code[1],
				  make_small(scb->ct[j]->code[2]));
		    hp += 4;
		}
		list = CONS(hp, term, list);
		hp += 2;
	    }
	    res = list;
	    res = TUPLE2(hp, item, res);
	    hp += 3;
	    HRelease(BIF_P,limit,hp);
	    return res;
	}
	break;
    }

    default:
	return THE_NON_VALUE; /* will produce badarg */

    }

    return TUPLE2(hp, item, res);
}
#undef MI_INC

#if defined(VALGRIND)
static int check_if_xml(void)
{
    char buf[1];
    size_t bufsz = sizeof(buf);
    return erts_sys_getenv("VALGRIND_LOG_XML", buf, &bufsz) >= 0;
}
#else
#define check_if_xml() 0
#endif

/*
 * This function takes care of calls to erlang:system_info/1 when the argument
 * is a tuple.
 */
static BIF_RETTYPE
info_1_tuple(Process* BIF_P,	/* Pointer to current process. */
	     Eterm* tp,		/* Pointer to first element in tuple */
	     int arity)		/* Arity of tuple (untagged). */
{
    Eterm ret;
    Eterm sel;

    sel = *tp++;

    if (sel == am_allocator_sizes && arity == 2) {
	return erts_allocator_info_term(BIF_P, *tp, 1);
    } else if (sel == am_wordsize && arity == 2) {
	if (tp[0] == am_internal) {
	    return make_small(sizeof(Eterm));
	}
	if (tp[0] == am_external) {
	    return make_small(sizeof(UWord));
	}
	goto badarg;
    } else if (sel == am_allocated) {
	if (arity == 2) {
	    Eterm res = THE_NON_VALUE;
	    char *buf;
	    int len = is_string(*tp);
	    if (len <= 0)
		return res;
	    buf = (char *) erts_alloc(ERTS_ALC_T_TMP, len+1);
	    if (intlist_to_buf(*tp, buf, len) != len)
		erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
	    buf[len] = '\0';
	    res = erts_instr_dump_memory_map(buf) ? am_true : am_false;
	    erts_free(ERTS_ALC_T_TMP, (void *) buf);
	    if (is_non_value(res))
		goto badarg;
	    return res;
	}
	else if (arity == 3 && tp[0] == am_status) {
	    if (is_atom(tp[1]))
		return erts_instr_get_stat(BIF_P, tp[1], 1);
	    else {
		Eterm res = THE_NON_VALUE;
		char *buf;
		int len = is_string(tp[1]);
		if (len <= 0)
		    return res;
		buf = (char *) erts_alloc(ERTS_ALC_T_TMP, len+1);
		if (intlist_to_buf(tp[1], buf, len) != len)
		    erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
		buf[len] = '\0';
		res = erts_instr_dump_stat(buf, 1) ? am_true : am_false;
		erts_free(ERTS_ALC_T_TMP, (void *) buf);
		if (is_non_value(res))
		    goto badarg;
		return res;
	    }
	}
	else
	    goto badarg;
    } else if (sel == am_allocator && arity == 2) {
	return erts_allocator_info_term(BIF_P, *tp, 0);
    } else if (ERTS_IS_ATOM_STR("internal_cpu_topology", sel) && arity == 2) {
	return erts_get_cpu_topology_term(BIF_P, *tp);
    } else if (ERTS_IS_ATOM_STR("cpu_topology", sel) && arity == 2) {
	Eterm res = erts_get_cpu_topology_term(BIF_P, *tp);
	ERTS_BIF_PREP_TRAP1(ret, erts_format_cpu_topology_trap, BIF_P, res);
	return ret;
#if defined(PURIFY) || defined(VALGRIND)
    } else if (ERTS_IS_ATOM_STR("error_checker", sel)
#if defined(PURIFY)
	       || sel == am_purify
#elif defined(VALGRIND)
	       || ERTS_IS_ATOM_STR("valgrind", sel)
#endif
	) {
	if (*tp == am_memory) {
#if defined(PURIFY)
	    BIF_RET(erts_make_integer(purify_new_leaks(), BIF_P));
#elif defined(VALGRIND)
	    VALGRIND_DO_LEAK_CHECK;
	    BIF_RET(make_small(0));
#endif
	} else if (*tp == am_fd) {
#if defined(PURIFY)
	    BIF_RET(erts_make_integer(purify_new_fds_inuse(), BIF_P));
#elif defined(VALGRIND)
	    /* Not present in valgrind... */
	    BIF_RET(make_small(0));
#endif
	} else if (*tp == am_running) {
#if defined(PURIFY)
	    BIF_RET(purify_is_running() ? am_true : am_false);
#elif defined(VALGRIND)
	    BIF_RET(RUNNING_ON_VALGRIND ? am_true : am_false);
#endif
	} else if (is_list(*tp)) {
#if defined(PURIFY)
#define ERTS_ERROR_CHECKER_PRINTF purify_printf
#elif defined(VALGRIND)
#define ERTS_ERROR_CHECKER_PRINTF VALGRIND_PRINTF
#endif
	    int buf_size = 8*1024; /* Try with 8KB first */
	    char *buf = erts_alloc(ERTS_ALC_T_TMP, buf_size);
	    int r = io_list_to_buf(*tp, (char*) buf, buf_size - 1);
	    if (r < 0) {
		erts_free(ERTS_ALC_T_TMP, (void *) buf);
		buf_size = io_list_len(*tp);
		if (buf_size < 0)
		    goto badarg;
		buf_size++;
		buf = erts_alloc(ERTS_ALC_T_TMP, buf_size);
		r = io_list_to_buf(*tp, (char*) buf, buf_size - 1);
		ASSERT(r == buf_size - 1);
	    }
	    buf[buf_size - 1 - r] = '\0';
	    if (check_if_xml()) {
		ERTS_ERROR_CHECKER_PRINTF("<erlang_info_log>"
					  "%s</erlang_info_log>\n", buf);
	    } else {
		ERTS_ERROR_CHECKER_PRINTF("%s\n", buf);
	    }
	    erts_free(ERTS_ALC_T_TMP, (void *) buf);
	    BIF_RET(am_true);
#undef ERTS_ERROR_CHECKER_PRINTF
	}
#endif
#ifdef QUANTIFY
    } else if (sel == am_quantify) {
	if (*tp == am_clear) {
	    quantify_clear_data();
	    BIF_RET(am_true);
	} else if (*tp == am_start) {
	    quantify_start_recording_data();
	    BIF_RET(am_true);
	} else if (*tp == am_stop) {
	    quantify_stop_recording_data();
	    BIF_RET(am_true);
	} else if (*tp == am_running) {
	    BIF_RET(quantify_is_running() ? am_true : am_false);
	}
#endif
#if defined(__GNUC__) && defined(HAVE_SOLARIS_SPARC_PERFMON)
    } else if (ERTS_IS_ATOM_STR("ultrasparc_set_pcr", sel)) {
	unsigned long long tmp;
	int fd;
	int rc;

	if (arity != 2 || !is_small(*tp)) {
	    goto badarg;
	}
	tmp = signed_val(*tp);
	if ((fd = open("/dev/perfmon", O_RDONLY)) == -1) {
	    BIF_RET(am_false);
	}
	rc = ioctl(fd, PERFMON_SETPCR, &tmp);
	close(fd);
	if (rc < 0) {
	    BIF_RET(am_false);
	}
	BIF_RET(am_true);
#endif
    }

 badarg:
    ERTS_BIF_PREP_ERROR(ret, BIF_P, BADARG);

    return ret;
}

#define INFO_DSBUF_INC_SZ 256

static erts_dsprintf_buf_t *
grow_info_dsbuf(erts_dsprintf_buf_t *dsbufp, size_t need)
{
    size_t size;
    size_t free_size = dsbufp->size - dsbufp->str_len;

    ASSERT(dsbufp);

    if (need <= free_size)
	return dsbufp;
    size = need - free_size + INFO_DSBUF_INC_SZ;
    size = ((size + INFO_DSBUF_INC_SZ - 1)/INFO_DSBUF_INC_SZ)*INFO_DSBUF_INC_SZ;
    size += dsbufp->size;
    ASSERT(dsbufp->str_len + need <= size);
    dsbufp->str = (char *) erts_realloc(ERTS_ALC_T_INFO_DSBUF,
					(void *) dsbufp->str,
					size);
    dsbufp->size = size;
    return dsbufp;
}

static erts_dsprintf_buf_t *
erts_create_info_dsbuf(Uint size)
{
    Uint init_size = size ? size : INFO_DSBUF_INC_SZ;
    erts_dsprintf_buf_t init = ERTS_DSPRINTF_BUF_INITER(grow_info_dsbuf);
    erts_dsprintf_buf_t *dsbufp = erts_alloc(ERTS_ALC_T_INFO_DSBUF,
					     sizeof(erts_dsprintf_buf_t));
    sys_memcpy((void *) dsbufp, (void *) &init, sizeof(erts_dsprintf_buf_t));
    dsbufp->str = (char *) erts_alloc(ERTS_ALC_T_INFO_DSBUF, init_size);
    dsbufp->str[0] = '\0';
    dsbufp->size = init_size;
    return dsbufp;
}

static void
erts_destroy_info_dsbuf(erts_dsprintf_buf_t *dsbufp)
{
    if (dsbufp->str)
	erts_free(ERTS_ALC_T_INFO_DSBUF, (void *) dsbufp->str);
    erts_free(ERTS_ALC_T_INFO_DSBUF, (void *) dsbufp);
}

static Eterm
c_compiler_used(Eterm **hpp, Uint *szp)
{

#if defined(__GNUC__)
#  if defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
#    define ERTS_GNUC_VSN_NUMS 3
#  elif defined(__GNUC_MINOR__)
#    define ERTS_GNUC_VSN_NUMS 2
#  else
#    define ERTS_GNUC_VSN_NUMS 1
#  endif
    return erts_bld_tuple(hpp,
			  szp,
			  2,
			  erts_bld_atom(hpp, szp, "gnuc"),
#if ERTS_GNUC_VSN_NUMS > 1
			  erts_bld_tuple(hpp,
					 szp,
					 ERTS_GNUC_VSN_NUMS,
#endif
					 erts_bld_uint(hpp, szp,
						       (Uint) __GNUC__)
#ifdef __GNUC_MINOR__
					 ,
					 erts_bld_uint(hpp, szp,
						       (Uint) __GNUC_MINOR__)
#ifdef __GNUC_PATCHLEVEL__
					 ,
					 erts_bld_uint(hpp, szp,
						       (Uint) __GNUC_PATCHLEVEL__)
#endif
#endif
#if ERTS_GNUC_VSN_NUMS > 1
			     )
#endif
	);

#elif defined(_MSC_VER)
    return erts_bld_tuple(hpp,
			  szp,
			  2,
			  erts_bld_atom(hpp, szp, "msc"),
			  erts_bld_uint(hpp, szp, (Uint) _MSC_VER));

#else
    return erts_bld_tuple(hpp,
			  szp,
			  2,
			  am_undefined,
			  am_undefined);
#endif

}

static int is_snif_term(Eterm module_atom) {
    int i;
    Atom *a = atom_tab(atom_val(module_atom));
    char *aname = (char *) a->name;

    /* if a->name has a '.' then the bif (snif) is bogus i.e a package */
    for (i = 0; i < a->len; i++) {
	if (aname[i] == '.')
	    return 0;
    }

    return 1;
}

static Eterm build_snif_term(Eterm **hpp, Uint *szp, int ix, Eterm res) {
    Eterm tup;
    tup = erts_bld_tuple(hpp, szp, 3, bif_table[ix].module, bif_table[ix].name, make_small(bif_table[ix].arity));
    res = erts_bld_cons( hpp, szp, tup, res);
    return res;
}

static Eterm build_snifs_term(Eterm **hpp, Uint *szp, Eterm res) {
    int i;
    for (i = 0; i < BIF_SIZE; i++) {
	if (is_snif_term(bif_table[i].module)) {
	    res = build_snif_term(hpp, szp, i, res);
	}
    }
    return res;
}

BIF_RETTYPE system_info_1(BIF_ALIST_1)
{
    Eterm res;
    Eterm* hp;
    Eterm val;
    int i;

    if (is_tuple(BIF_ARG_1)) {
	Eterm* tp = tuple_val(BIF_ARG_1);
	Uint arity = *tp++;
	return info_1_tuple(BIF_P, tp, arityval(arity));
    } else if (BIF_ARG_1 == am_scheduler_id) {
#ifdef ERTS_SMP
	    ASSERT(BIF_P->scheduler_data);
	    BIF_RET(make_small(BIF_P->scheduler_data->no));
#else
	    BIF_RET(make_small(1));
#endif
    } else if (BIF_ARG_1 == am_compat_rel) {
	ASSERT(erts_compat_rel > 0);
	BIF_RET(make_small(erts_compat_rel));
    } else if (BIF_ARG_1 == am_multi_scheduling) {
#ifndef ERTS_SMP
	BIF_RET(am_disabled);
#else
	if (erts_no_schedulers == 1)
	    BIF_RET(am_disabled);
	else {
	    BIF_RET(erts_is_multi_scheduling_blocked()
		    ? am_blocked
		    : am_enabled);
	}
#endif
    } else if (BIF_ARG_1 == am_allocated_areas) {
	res = erts_allocated_areas(NULL, NULL, BIF_P);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_allocated) {
	BIF_RET(erts_instr_get_memory_map(BIF_P));
    } else if (BIF_ARG_1 == am_hipe_architecture) {
#if defined(HIPE)
	BIF_RET(hipe_arch_name);
#else
	BIF_RET(am_undefined);
#endif
    } else if (BIF_ARG_1 == am_trace_control_word) {
	BIF_RET(db_get_trace_control_word_0(BIF_P));
    } else if (ERTS_IS_ATOM_STR("ets_realloc_moves", BIF_ARG_1)) {
 	BIF_RET((erts_ets_realloc_always_moves) ? am_true : am_false);
    } else if (ERTS_IS_ATOM_STR("snifs", BIF_ARG_1)) {
	Uint size = 0;
	Uint *szp;

	szp = &size;
	build_snifs_term(NULL, szp, NIL);
	hp = HAlloc(BIF_P, size);
	res = build_snifs_term(&hp, NULL, NIL);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_sequential_tracer) {
	val = erts_get_system_seq_tracer();
	ASSERT(is_internal_pid(val) || is_internal_port(val) || val==am_false)
	hp = HAlloc(BIF_P, 3);
	res = TUPLE2(hp, am_sequential_tracer, val);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_garbage_collection){
	Uint val = (Uint) erts_smp_atomic_read(&erts_max_gen_gcs);
	Eterm tup;
	hp = HAlloc(BIF_P, 3+2 + 3+2 + 3+2);

	tup = TUPLE2(hp, am_fullsweep_after, make_small(val)); hp += 3;
	res = CONS(hp, tup, NIL); hp += 2;

	tup = TUPLE2(hp, am_min_heap_size, make_small(H_MIN_SIZE)); hp += 3;
	res = CONS(hp, tup, res); hp += 2;

	tup = TUPLE2(hp, am_min_bin_vheap_size, make_small(BIN_VH_MIN_SIZE)); hp += 3;
	res = CONS(hp, tup, res); hp += 2;

	BIF_RET(res);
    } else if (BIF_ARG_1 == am_fullsweep_after){
	Uint val = (Uint) erts_smp_atomic_read(&erts_max_gen_gcs);
	hp = HAlloc(BIF_P, 3);
	res = TUPLE2(hp, am_fullsweep_after, make_small(val));
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_min_heap_size) {
	hp = HAlloc(BIF_P, 3);
	res = TUPLE2(hp, am_min_heap_size,make_small(H_MIN_SIZE));
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_min_bin_vheap_size) {
	hp = HAlloc(BIF_P, 3);
	res = TUPLE2(hp, am_min_bin_vheap_size,make_small(BIN_VH_MIN_SIZE));
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_process_count) {
	BIF_RET(make_small(erts_process_count()));
    } else if (BIF_ARG_1 == am_process_limit) {
	BIF_RET(make_small(erts_max_processes));
    } else if (BIF_ARG_1 == am_info
	       || BIF_ARG_1 == am_procs
	       || BIF_ARG_1 == am_loaded
	       || BIF_ARG_1 == am_dist) {
	erts_dsprintf_buf_t *dsbufp = erts_create_info_dsbuf(0);

	/* Need to be the only thread running... */
	erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	erts_smp_block_system(0);

	if (BIF_ARG_1 == am_info)
	    info(ERTS_PRINT_DSBUF, (void *) dsbufp);
	else if (BIF_ARG_1 == am_procs)
	    process_info(ERTS_PRINT_DSBUF, (void *) dsbufp);
	else if (BIF_ARG_1 == am_loaded)
	    loaded(ERTS_PRINT_DSBUF, (void *) dsbufp);
	else
	    distribution_info(ERTS_PRINT_DSBUF, (void *) dsbufp);

	erts_smp_release_system();
	erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);

	ASSERT(dsbufp && dsbufp->str);
	res = new_binary(BIF_P, (byte *) dsbufp->str, (int) dsbufp->str_len);
	erts_destroy_info_dsbuf(dsbufp);
	BIF_RET(res);
    } else if (ERTS_IS_ATOM_STR("dist_ctrl", BIF_ARG_1)) {
	DistEntry *dep;
	i = 0;
	/* Need to be the only thread running... */
	erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	erts_smp_block_system(0);
	for (dep = erts_visible_dist_entries; dep; dep = dep->next) 
	    ++i;
	for (dep = erts_hidden_dist_entries; dep; dep = dep->next)
	    ++i;
	hp = HAlloc(BIF_P,i*(3+2));
	res = NIL;
	for (dep = erts_hidden_dist_entries; dep; dep = dep->next) {
	    Eterm tpl;
	    ASSERT(is_immed(dep->cid));
	    tpl = TUPLE2(hp, dep->sysname, dep->cid);
	    hp +=3;
	    res = CONS(hp, tpl, res);
	    hp += 2;
	}
	for (dep = erts_visible_dist_entries; dep; dep = dep->next) {
	    Eterm tpl;
	    ASSERT(is_immed(dep->cid));
	    tpl = TUPLE2(hp, dep->sysname, dep->cid);
	    hp +=3;
	    res = CONS(hp, tpl, res);
	    hp += 2;
	}
	erts_smp_release_system();
	erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_system_version) {
	erts_dsprintf_buf_t *dsbufp = erts_create_tmp_dsbuf(0);
	erts_print_system_version(ERTS_PRINT_DSBUF, (void *) dsbufp, BIF_P);
	hp = HAlloc(BIF_P, dsbufp->str_len*2);
	res = buf_to_intlist(&hp, dsbufp->str, dsbufp->str_len, NIL);
	erts_destroy_tmp_dsbuf(dsbufp);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_system_architecture) {
	hp = HAlloc(BIF_P, 2*(sizeof(ERLANG_ARCHITECTURE)-1));
	BIF_RET(buf_to_intlist(&hp,
			       ERLANG_ARCHITECTURE,
			       sizeof(ERLANG_ARCHITECTURE)-1,
			       NIL));
    } 
    else if (BIF_ARG_1 == am_memory_types) {
	return erts_instr_get_type_info(BIF_P);
    }
    else if (BIF_ARG_1 == am_os_type) {
       Eterm type = am_atom_put(os_type, strlen(os_type));
       Eterm flav, tup;
       char *buf = erts_alloc(ERTS_ALC_T_TMP, 1024); /* More than enough */

       os_flavor(buf, 1024);
       flav = am_atom_put(buf, strlen(buf));
       hp = HAlloc(BIF_P, 3);
       tup = TUPLE2(hp, type, flav);
       erts_free(ERTS_ALC_T_TMP, (void *) buf);
       BIF_RET(tup);
    }
    else if (BIF_ARG_1 == am_allocator) {
	BIF_RET(erts_allocator_options((void *) BIF_P));
    }
    else if (BIF_ARG_1 == am_thread_pool_size) {
#ifdef USE_THREADS
	extern int erts_async_max_threads;
#endif
	int n;
	
#ifdef USE_THREADS
	n = erts_async_max_threads;
#else
	n = 0;
#endif
	BIF_RET(make_small(n));
    }
    else if (BIF_ARG_1 == am_alloc_util_allocators) {
	BIF_RET(erts_alloc_util_allocators((void *) BIF_P));
    }
    else if (BIF_ARG_1 == am_elib_malloc) {
#ifdef ELIB_ALLOC_IS_CLIB
	struct elib_stat stat;
	DECL_AM(heap_size);
	DECL_AM(max_alloced_size);
	DECL_AM(alloced_size);
	DECL_AM(free_size);
	DECL_AM(no_alloced_blocks);
	DECL_AM(no_free_blocks);
	DECL_AM(smallest_alloced_block);
	DECL_AM(largest_free_block);
	Eterm atoms[8];
	Eterm ints[8];
	Uint **hpp;
	Uint sz;
	Uint *szp;
	int length;
#ifdef DEBUG
	Uint *endp;
#endif

	elib_stat(&stat);

	/* First find out the heap size needed ... */
	hpp = NULL;
	szp = &sz;
	sz = 0;

    build_elib_malloc_term:
	length = 0;
	atoms[length] = AM_heap_size;
	ints[length++] = erts_bld_uint(hpp, szp,
				       (Uint) stat.mem_total*sizeof(Uint));
	atoms[length] = AM_max_alloced_size;
	ints[length++] = erts_bld_uint(hpp, szp,
				       (Uint) stat.mem_max_alloc*sizeof(Uint));
	atoms[length] = AM_alloced_size;
	ints[length++] = erts_bld_uint(hpp, szp,
				       (Uint) stat.mem_alloc*sizeof(Uint));
	atoms[length] = AM_free_size;
	ints[length++] = erts_bld_uint(hpp, szp,
				       (Uint) stat.mem_free*sizeof(Uint));
	atoms[length] = AM_no_alloced_blocks;
	ints[length++] = erts_bld_uint(hpp, szp, (Uint) stat.mem_blocks);
	atoms[length] = AM_no_free_blocks;
	ints[length++] = erts_bld_uint(hpp, szp, (Uint) stat.free_blocks);
	atoms[length] = AM_smallest_alloced_block;
	ints[length++] = erts_bld_uint(hpp, szp,
				       (Uint) stat.min_used*sizeof(Uint));
	atoms[length] = AM_largest_free_block;
	ints[length++] = erts_bld_uint(hpp, szp,
				       (Uint) stat.max_free*sizeof(Uint));



	ASSERT(length <= sizeof(atoms)/sizeof(Eterm));
	ASSERT(length <= sizeof(ints)/sizeof(Eterm));

	res = erts_bld_2tup_list(hpp, szp, length, atoms, ints);

	if (szp) {
	    /* ... and then build the term */
	    hp = HAlloc(BIF_P, sz);
#ifdef DEBUG
	    endp = hp + sz;
#endif

	    szp = NULL;
	    hpp = &hp;
	    goto build_elib_malloc_term;
	}

#ifdef DEBUG
	ASSERT(endp == hp);
#endif

#else /* #ifdef ELIB_ALLOC_IS_CLIB */
	res = am_false;
#endif /* #ifdef ELIB_ALLOC_IS_CLIB */

	BIF_RET(res);
    }
    else if (BIF_ARG_1 == am_os_version) {
       int major, minor, build;
       Eterm tup;

       os_version(&major, &minor, &build);
       hp = HAlloc(BIF_P, 4);
       tup = TUPLE3(hp,
		    make_small(major),
		    make_small(minor),
		    make_small(build));
       BIF_RET(tup);
    }
    else if (BIF_ARG_1 == am_version) {
	int n = strlen(ERLANG_VERSION);
	hp = HAlloc(BIF_P, ((sizeof ERLANG_VERSION)-1) * 2);
	BIF_RET(buf_to_intlist(&hp, ERLANG_VERSION, n, NIL));
    }
    else if (BIF_ARG_1 == am_machine) {
	int n = strlen(EMULATOR);
	hp = HAlloc(BIF_P, n*2);
	BIF_RET(buf_to_intlist(&hp, EMULATOR, n, NIL));
    }
    else if (BIF_ARG_1 == am_garbage_collection) {
	BIF_RET(am_generational);
#ifdef ERTS_OPCODE_COUNTER_SUPPORT
    } else if (BIF_ARG_1 == am_instruction_counts) {
#ifdef DEBUG
	Eterm *endp;
#endif
	Eterm *hp, **hpp;
	Uint hsz, *hszp;
	int i;

	hpp = NULL;
	hsz = 0;
	hszp = &hsz;

    bld_instruction_counts:

	res = NIL;
	for (i = num_instructions-1; i >= 0; i--) {
	    res = erts_bld_cons(hpp, hszp,
				erts_bld_tuple(hpp, hszp, 2,
					       am_atom_put(opc[i].name,
							   strlen(opc[i].name)),
					       erts_bld_uint(hpp, hszp,
							     opc[i].count)),
				res);
	}

	if (!hpp) {
	    hp = HAlloc(BIF_P, hsz);
	    hpp = &hp;
#ifdef DEBUG
	    endp = hp + hsz;
#endif
	    hszp = NULL;
	    goto bld_instruction_counts;
	}

#ifdef DEBUG
	ASSERT(endp == hp);
#endif

	BIF_RET(res);
#endif /* #ifndef ERTS_SMP */
    } else if (BIF_ARG_1 == am_wordsize) {
	return make_small(sizeof(Eterm));
    } else if (BIF_ARG_1 == am_endian) {
#if defined(WORDS_BIGENDIAN)
	return am_big;
#else
	return am_little;
#endif
    } else if (BIF_ARG_1 == am_heap_sizes) {
	return erts_heap_sizes(BIF_P);
    } else if (BIF_ARG_1 == am_global_heaps_size) {
#ifdef HYBRID
	Uint hsz = 0;
	Uint sz = 0;

	sz += global_heap_sz;
#ifdef INCREMENTAL
        /* The size of the old generation is a bit hard to define here...
         * The amount of live data in the last collection perhaps..? */
        sz = 0;
#else
	if (global_old_hend && global_old_heap)
	    sz += global_old_hend - global_old_heap;
#endif

	sz *= sizeof(Eterm);

	(void) erts_bld_uint(NULL, &hsz, sz);
	hp = hsz ? HAlloc(BIF_P, hsz) : NULL;
	res = erts_bld_uint(&hp, NULL, sz);
#else
	res = make_small(0);
#endif
	return res;
    } else if (BIF_ARG_1 == am_heap_type) {
#if defined(HYBRID)
        return am_hybrid;
#else
	return am_private;
#endif
    } else if (ERTS_IS_ATOM_STR("cpu_topology", BIF_ARG_1)) {
	res = erts_get_cpu_topology_term(BIF_P, am_used);
	BIF_TRAP1(erts_format_cpu_topology_trap, BIF_P, res);
#if defined(__GNUC__) && defined(HAVE_SOLARIS_SPARC_PERFMON)
    } else if (ERTS_IS_ATOM_STR("ultrasparc_read_tick1", BIF_ARG_1)) {
	register unsigned high asm("%l0");
	register unsigned low asm("%l1");

	hp = HAlloc(BIF_P, 5);
	asm volatile (".word 0xa3410000;" /* rd %tick, %l1 */
		      ".word 0xa1347020" /* srlx  %l1, 0x20, %l0 */
		      : "=r" (high), "=r" (low));
	res = TUPLE4(hp, make_small(high >> 16),
		     make_small(high & 0xFFFF),
		     make_small(low >> 16),
		     make_small(low & 0xFFFF));
	BIF_RET(res);
    } else if (ERTS_IS_ATOM_STR("ultrasparc_read_tick2", BIF_ARG_1)) {
	register unsigned high asm("%l0");
	register unsigned low asm("%l1");

	asm volatile (".word 0xa3410000;" /* rd %tick, %l1 */
		      ".word 0xa1347020" /* srlx  %l1, 0x20, %l0 */
		      : "=r" (high), "=r" (low));
	hp = HAlloc(BIF_P, 5);
	res = TUPLE4(hp, make_small(high >> 16),
		     make_small(high & 0xFFFF),
		     make_small(low >> 16),
		     make_small(low & 0xFFFF));
	BIF_RET(res);
    } else if (ERTS_IS_ATOM_STR("ultrasparc_read_pic1", BIF_ARG_1)) {
	register unsigned high asm("%l0");
	register unsigned low asm("%l1");

	hp = HAlloc(BIF_P, 5);
	asm volatile (".word 0xa3444000;" /* rd %asr17, %l1 */
		      ".word 0xa1347020" /* srlx  %l1, 0x20, %l0 */
		      : "=r" (high), "=r" (low));
	res = TUPLE4(hp, make_small(high >> 16),
		     make_small(high & 0xFFFF),
		     make_small(low >> 16),
		     make_small(low & 0xFFFF));
	BIF_RET(res);
    } else if (ERTS_IS_ATOM_STR("ultrasparc_read_pic2", BIF_ARG_1)) {
	register unsigned high asm("%l0");
	register unsigned low asm("%l1");

	asm volatile (".word 0xa3444000;" /* rd %asr17, %l1 */
		      ".word 0xa1347020" /* srlx  %l1, 0x20, %l0 */
		      : "=r" (high), "=r" (low));
	hp = HAlloc(BIF_P, 5);
	res = TUPLE4(hp, make_small(high >> 16),
		     make_small(high & 0xFFFF),
		     make_small(low >> 16),
		     make_small(low & 0xFFFF));
	BIF_RET(res);
#endif
    } else if (BIF_ARG_1 == am_threads) {
#ifdef USE_THREADS
	return am_true;
#else
	return am_false;
#endif
    } else if (BIF_ARG_1 == am_creation) {
	return make_small(erts_this_node->creation);
    } else if (BIF_ARG_1 == am_break_ignored) {
      extern int ignore_break;
      if (ignore_break) 
	return am_true; 
      else
	return am_false;
    }
    /* Arguments that are unusual follow ... */
    else if (ERTS_IS_ATOM_STR("logical_processors", BIF_ARG_1)) {
	int no = erts_get_cpu_configured(erts_cpuinfo);
	if (no > 0)
	    BIF_RET(make_small((Uint) no));
	else {
	    DECL_AM(unknown);
	    BIF_RET(AM_unknown);
	}
    }
    else if (ERTS_IS_ATOM_STR("logical_processors_online", BIF_ARG_1)) {
	int no = erts_get_cpu_online(erts_cpuinfo);
	if (no > 0)
	    BIF_RET(make_small((Uint) no));
	else {
	    DECL_AM(unknown);
	    BIF_RET(AM_unknown);
	}
    }
    else if (ERTS_IS_ATOM_STR("logical_processors_available", BIF_ARG_1)) {
	int no = erts_get_cpu_available(erts_cpuinfo);
	if (no > 0)
	    BIF_RET(make_small((Uint) no));
	else {
	    DECL_AM(unknown);
	    BIF_RET(AM_unknown);
	}
    } else if (ERTS_IS_ATOM_STR("otp_release", BIF_ARG_1)) {
	int n = sizeof(ERLANG_OTP_RELEASE)-1;
	hp = HAlloc(BIF_P, 2*n);
	BIF_RET(buf_to_intlist(&hp, ERLANG_OTP_RELEASE, n, NIL));
    } else if (ERTS_IS_ATOM_STR("driver_version", BIF_ARG_1)) {
	char buf[42];
	int n = erts_snprintf(buf, 42, "%d.%d",
			      ERL_DRV_EXTENDED_MAJOR_VERSION,
			      ERL_DRV_EXTENDED_MINOR_VERSION);
	hp = HAlloc(BIF_P, 2*n);
	BIF_RET(buf_to_intlist(&hp, buf, n, NIL));
    } else if (ERTS_IS_ATOM_STR("smp_support", BIF_ARG_1)) {
#ifdef ERTS_SMP
	BIF_RET(am_true);
#else
	BIF_RET(am_false);
#endif
    } else if (ERTS_IS_ATOM_STR("scheduler_bind_type", BIF_ARG_1)) {
	BIF_RET(erts_bound_schedulers_term(BIF_P));
    } else if (ERTS_IS_ATOM_STR("scheduler_bindings", BIF_ARG_1)) {
	BIF_RET(erts_get_schedulers_binds(BIF_P));
    } else if (ERTS_IS_ATOM_STR("constant_pool_support", BIF_ARG_1)) {
	BIF_RET(am_true);
    } else if (ERTS_IS_ATOM_STR("schedulers", BIF_ARG_1)
	       || ERTS_IS_ATOM_STR("schedulers_total", BIF_ARG_1)) {
	res = make_small(erts_no_schedulers);
	BIF_RET(res);
    } else if (ERTS_IS_ATOM_STR("schedulers_state", BIF_ARG_1)) {
#ifndef ERTS_SMP
	Eterm *hp = HAlloc(BIF_P, 4);
	res = TUPLE3(hp, make_small(1), make_small(1), make_small(1));
	BIF_RET(res);
#else
	Uint total, online, active;
	switch (erts_schedulers_state(&total,
				      &online,
				      &active,
				      1)) {
	case ERTS_SCHDLR_SSPND_DONE: {
	    Eterm *hp = HAlloc(BIF_P, 4);
	    res = TUPLE3(hp,
			 make_small(total),
			 make_small(online),
			 make_small(active));
	    BIF_RET(res);
	}
	case ERTS_SCHDLR_SSPND_YIELD_RESTART:
	    ERTS_VBUMP_ALL_REDS(BIF_P);
	    BIF_TRAP1(bif_export[BIF_system_info_1],
		      BIF_P, BIF_ARG_1);
	default:
	    ASSERT(0);
	    BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR);
	}
#endif
    } else if (ERTS_IS_ATOM_STR("schedulers_online", BIF_ARG_1)) {
#ifndef ERTS_SMP
	BIF_RET(make_small(1));
#else
	Uint total, online, active;
	switch (erts_schedulers_state(&total, &online, &active, 1)) {
	case ERTS_SCHDLR_SSPND_DONE:
	    BIF_RET(make_small(online));
	case ERTS_SCHDLR_SSPND_YIELD_RESTART:
	    ERTS_VBUMP_ALL_REDS(BIF_P);
	    BIF_TRAP1(bif_export[BIF_system_info_1],
		      BIF_P, BIF_ARG_1);
	default:
	    ASSERT(0);
	    BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR);
	}
#endif
    } else if (ERTS_IS_ATOM_STR("schedulers_active", BIF_ARG_1)) {
#ifndef ERTS_SMP
	BIF_RET(make_small(1));
#else
	Uint total, online, active;
	switch (erts_schedulers_state(&total, &online, &active, 1)) {
	case ERTS_SCHDLR_SSPND_DONE:
	    BIF_RET(make_small(active));
	case ERTS_SCHDLR_SSPND_YIELD_RESTART:
	    ERTS_VBUMP_ALL_REDS(BIF_P);
	    BIF_TRAP1(bif_export[BIF_system_info_1],
		      BIF_P, BIF_ARG_1);
	default:
	    ASSERT(0);
	    BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR);
	}
#endif
    } else if (ERTS_IS_ATOM_STR("run_queues", BIF_ARG_1)) {
	res = make_small(erts_no_run_queues);
	BIF_RET(res);
    } else if (ERTS_IS_ATOM_STR("c_compiler_used", BIF_ARG_1)) {
	Eterm *hp = NULL;
	Uint sz = 0;
	(void) c_compiler_used(NULL, &sz);
	if (sz)
	    hp = HAlloc(BIF_P, sz);
	BIF_RET(c_compiler_used(&hp, NULL));
    } else if (ERTS_IS_ATOM_STR("stop_memory_trace", BIF_ARG_1)) {
	erts_mtrace_stop();
	BIF_RET(am_true);
    } else if (ERTS_IS_ATOM_STR("context_reductions", BIF_ARG_1)) {
	BIF_RET(make_small(CONTEXT_REDS));
    } else if (ERTS_IS_ATOM_STR("kernel_poll", BIF_ARG_1)) {
#ifdef ERTS_ENABLE_KERNEL_POLL
	BIF_RET(erts_use_kernel_poll ? am_true : am_false);
#else
	BIF_RET(am_false);
#endif    
    } else if (ERTS_IS_ATOM_STR("lock_checking", BIF_ARG_1)) {
#ifdef ERTS_ENABLE_LOCK_CHECK
	BIF_RET(am_true);
#else
	BIF_RET(am_false);
#endif
    } else if (ERTS_IS_ATOM_STR("lock_counting", BIF_ARG_1)) {
#ifdef ERTS_ENABLE_LOCK_COUNT
	BIF_RET(am_true);
#else
	BIF_RET(am_false);
#endif
    } else if (ERTS_IS_ATOM_STR("debug_compiled", BIF_ARG_1)) {
#ifdef DEBUG
	BIF_RET(am_true);
#else
	BIF_RET(am_false);
#endif
    } else if (ERTS_IS_ATOM_STR("check_io", BIF_ARG_1)) {
	BIF_RET(erts_check_io_info(BIF_P));
    } else if (ERTS_IS_ATOM_STR("multi_scheduling_blockers", BIF_ARG_1)) {
#ifndef ERTS_SMP
	BIF_RET(NIL);
#else
	if (erts_no_schedulers == 1)
	    BIF_RET(NIL);
	else
	    BIF_RET(erts_multi_scheduling_blockers(BIF_P));
#endif
    } else if (ERTS_IS_ATOM_STR("modified_timing_level", BIF_ARG_1)) {
	BIF_RET(ERTS_USE_MODIFIED_TIMING()
		? make_small(erts_modified_timing_level)
		: am_undefined);
    } else if (ERTS_IS_ATOM_STR("port_tasks", BIF_ARG_1)) {
	BIF_RET(am_true);
    } else if (ERTS_IS_ATOM_STR("io_thread", BIF_ARG_1)) {
	BIF_RET(am_false);
    } else if (ERTS_IS_ATOM_STR("scheduling_statistics", BIF_ARG_1)) {
	BIF_RET(erts_sched_stat_term(BIF_P, 0));
    } else if (ERTS_IS_ATOM_STR("total_scheduling_statistics", BIF_ARG_1)) {
	BIF_RET(erts_sched_stat_term(BIF_P, 1));
    } else if (ERTS_IS_ATOM_STR("taints", BIF_ARG_1)) {
	BIF_RET(erts_nif_taints(BIF_P));
    }

    BIF_ERROR(BIF_P, BADARG);
}

Eterm
port_info_1(Process* p, Eterm pid)
{
    static Eterm keys[] = {
	am_name,
	am_links,
	am_id,
	am_connected,
	am_input,
	am_output
    };
    Eterm items[ASIZE(keys)];
    Eterm result = NIL;
    Eterm reg_name;
    Eterm* hp;
    Uint need;
    int i;

    /*
     * Collect all information about the port.
     */

    for (i = 0; i < ASIZE(keys); i++) {
	Eterm item;

	item = port_info_2(p, pid, keys[i]);
	if (is_non_value(item)) {
	    return THE_NON_VALUE;
	}
	if (item == am_undefined) {
	    return am_undefined;
	}
	items[i] = item;
    }
    reg_name = port_info_2(p, pid, am_registered_name);

    /*
     * Build the resulting list.
     */

    need = 2*ASIZE(keys);
    if (is_tuple(reg_name)) {
	need += 2;
    }
    hp = HAlloc(p, need);
    for (i = ASIZE(keys) - 1; i >= 0; i--) {
	result = CONS(hp, items[i], result);
	hp += 2;
    }
    if (is_tuple(reg_name)) {
	result = CONS(hp, reg_name, result);
    }

    return result;
}


/**********************************************************************/ 
/* Return information on ports */
/* Info:
**    id          Port index
**    connected   (Pid)
**    links       List of pids
**    name        String
**    input       Number of bytes input from port program
**    output      Number of bytes output to the port program
*/

BIF_RETTYPE port_info_2(BIF_ALIST_2)
{
    BIF_RETTYPE ret;
    Eterm portid = BIF_ARG_1;
    Port *prt;
    Eterm item = BIF_ARG_2;
    Eterm res;
    Eterm* hp;
    int count;

    if (is_internal_port(portid))
	prt = erts_id2port(portid, BIF_P, ERTS_PROC_LOCK_MAIN);
    else if (is_atom(portid))
	erts_whereis_name(BIF_P, ERTS_PROC_LOCK_MAIN,
			  portid, NULL, 0, 0, &prt);
    else if (is_external_port(portid)
	     && external_port_dist_entry(portid) == erts_this_dist_entry)
	BIF_RET(am_undefined);
    else {
	BIF_ERROR(BIF_P, BADARG);
    }

    if (!prt) {
	BIF_RET(am_undefined);
    }

    if (item == am_id) {
	hp = HAlloc(BIF_P, 3);
	res = make_small(internal_port_number(portid));
    }
    else if (item == am_links) {
	MonitorInfoCollection mic;
	int i;
	Eterm item;

	INIT_MONITOR_INFOS(mic);

	erts_doforall_links(prt->nlinks, &collect_one_link, &mic);

	hp = HAlloc(BIF_P, 3 + mic.sz);
	res = NIL;
	for (i = 0; i < mic.mi_i; i++) {
	    item = STORE_NC(&hp, &MSO(BIF_P).externals, mic.mi[i].entity); 
	    res = CONS(hp, item, res);
	    hp += 2;
	}
	DESTROY_MONITOR_INFOS(mic);

    }
    else if (item == am_monitors) {
	MonitorInfoCollection mic;
	int i;
	Eterm item;

	INIT_MONITOR_INFOS(mic);

	erts_doforall_monitors(prt->monitors, &collect_one_origin_monitor, &mic);

	hp = HAlloc(BIF_P, 3 + mic.sz);
	res = NIL;
	for (i = 0; i < mic.mi_i; i++) {
	    Eterm t;
	    item = STORE_NC(&hp, &MSO(BIF_P).externals, mic.mi[i].entity); 
	    t = TUPLE2(hp, am_process, item);
	    hp += 3;
	    res = CONS(hp, t, res);
	    hp += 2;
	}
	DESTROY_MONITOR_INFOS(mic);

    }
    else if (item == am_name) {
	count = sys_strlen(prt->name);

	hp = HAlloc(BIF_P, 3 + 2*count);
	res = buf_to_intlist(&hp, prt->name, count, NIL);
    }
    else if (item == am_connected) {
	hp = HAlloc(BIF_P, 3);
	res = prt->connected; /* internal pid */
    }
    else if (item == am_input) {
	Uint hsz = 3;
	Uint n = prt->bytes_in;
	(void) erts_bld_uint(NULL, &hsz, n);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, n);
    }
    else if (item == am_output) {
	Uint hsz = 3;
	Uint n = prt->bytes_out;
	(void) erts_bld_uint(NULL, &hsz, n);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, n);
    }
    else if (item == am_registered_name) {
	RegProc *reg;
	reg = prt->reg;
	if (reg == NULL) {
	    ERTS_BIF_PREP_RET(ret, NIL);
	    goto done;
	} else {
	    hp = HAlloc(BIF_P, 3);
	    res = reg->name;
	}
    }
    else if (item == am_memory) {
	/* All memory consumed in bytes (the Port struct should not be
	   included though).
	 */
	Uint hsz = 3;
	Uint size = 0;
	ErlHeapFragment* bp;

	hp = HAlloc(BIF_P, 3);

	erts_doforall_links(prt->nlinks, &one_link_size, &size);

	for (bp = prt->bp; bp; bp = bp->next)
	    size += sizeof(ErlHeapFragment) + (bp->alloc_size - 1)*sizeof(Eterm);

	if (prt->linebuf)
	    size += sizeof(LineBuf) + prt->linebuf->ovsiz;

	/* ... */


	/* All memory allocated by the driver should be included, but it is
	   hard to retrieve... */
	
	(void) erts_bld_uint(NULL, &hsz, size);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, size);
    }
    else if (item == am_queue_size) {
	Uint ioq_size = erts_port_ioq_size(prt);
	Uint hsz = 3;
	(void) erts_bld_uint(NULL, &hsz, ioq_size);
	hp = HAlloc(BIF_P, hsz);
	res = erts_bld_uint(&hp, NULL, ioq_size);
    }
    else if (ERTS_IS_ATOM_STR("locking", item)) {
	hp = HAlloc(BIF_P, 3);
#ifndef ERTS_SMP
	res = am_false;
#else
	if (prt->status & ERTS_PORT_SFLG_PORT_SPECIFIC_LOCK) {
	    DECL_AM(port_level);
	    ASSERT(prt->drv_ptr->flags
		   & ERL_DRV_FLAG_USE_PORT_LOCKING);
	    res = AM_port_level;
	}
	else {
	    DECL_AM(driver_level);
	    ASSERT(!(prt->drv_ptr->flags
		     & ERL_DRV_FLAG_USE_PORT_LOCKING));
	    res = AM_driver_level;
	}
#endif
    }
    else {
	ERTS_BIF_PREP_ERROR(ret, BIF_P, BADARG);
	goto done;
    }

    ERTS_BIF_PREP_RET(ret, TUPLE2(hp, item, res));

 done:

    erts_smp_port_unlock(prt);

    return ret;
}


Eterm
fun_info_2(Process* p, Eterm fun, Eterm what)
{
    Eterm* hp;
    Eterm val;

    if (is_fun(fun)) {
	ErlFunThing* funp = (ErlFunThing *) fun_val(fun);

	switch (what) {
	case am_type:
	    hp = HAlloc(p, 3);
	    val = am_local;
	    break;
	case am_pid:
	    hp = HAlloc(p, 3);
	    val = funp->creator;
	    break;
	case am_module:
	    hp = HAlloc(p, 3);
	    val = funp->fe->module;
	    break;
	case am_new_index:
	    hp = HAlloc(p, 3);
	    val = make_small(funp->fe->index);
	    break;
	case am_new_uniq:
	    val = new_binary(p, funp->fe->uniq, 16);
	    hp = HAlloc(p, 3);
	    break;
	case am_index:
	    hp = HAlloc(p, 3);
	    val = make_small(funp->fe->old_index);
	    break;
	case am_uniq:
	    hp = HAlloc(p, 3);
	    val = make_small(funp->fe->old_uniq);
	    break;
	case am_env:
	    {
		Uint num_free = funp->num_free;
		int i;

		hp = HAlloc(p, 3 + 2*num_free);
		val = NIL;
		for (i = num_free-1; i >= 0; i--) {
		    val = CONS(hp, funp->env[i], val);
		    hp += 2;
		}
	    }
	    break;
	case am_refc:
	    val = erts_make_integer(erts_smp_atomic_read(&funp->fe->refc), p);
	    hp = HAlloc(p, 3);
	    break;
	case am_arity:
	    hp = HAlloc(p, 3);
	    val = make_small(funp->arity);
	    break;
	case am_name:
	    hp = HAlloc(p, 3);
	    val = funp->fe->address[-2];
	    break;
	default:
	    goto error;
	}
    } else if (is_export(fun)) {
	Export* exp = (Export *) ((UWord) (export_val(fun))[1]);
	switch (what) {
	case am_type:
	    hp = HAlloc(p, 3);
	    val = am_external;
	    break;
	case am_pid:
	    hp = HAlloc(p, 3);
	    val = am_undefined;
	    break;
	case am_module:
	    hp = HAlloc(p, 3);
	    val = exp->code[0];
	    break;
	case am_new_index:
	    hp = HAlloc(p, 3);
	    val = am_undefined;
	    break;
	case am_new_uniq:
	    hp = HAlloc(p, 3);
	    val = am_undefined;
	    break;
	case am_index:
	    hp = HAlloc(p, 3);
	    val = am_undefined;
	    break;
	case am_uniq:
	    hp = HAlloc(p, 3);
	    val = am_undefined;
	    break;
	case am_env:
	    hp = HAlloc(p, 3);
	    val = NIL;
	    break;
	case am_refc:
	    hp = HAlloc(p, 3);
	    val = am_undefined;
	    break;
	case am_arity:
	    hp = HAlloc(p, 3);
	    val = make_small(exp->code[2]);
	    break;
	case am_name:
	    hp = HAlloc(p, 3);
	    val = exp->code[1];
	    break;
	default:
	    goto error;
	}
    } else {
    error:
	BIF_ERROR(p, BADARG);
    }
    return TUPLE2(hp, what, val);
}

BIF_RETTYPE is_process_alive_1(BIF_ALIST_1) 
{
   if(is_internal_pid(BIF_ARG_1)) {
       Process *rp;

       if (BIF_ARG_1 == BIF_P->id)
	   BIF_RET(am_true);

       if(internal_pid_index(BIF_ARG_1) >= erts_max_processes)
	   BIF_ERROR(BIF_P, BADARG);

       rp = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN,
			  BIF_ARG_1, ERTS_PROC_LOCK_STATUS);
       if (!rp) {
	   BIF_RET(am_false);
       }
       else {
	   int have_pending_exit = ERTS_PROC_PENDING_EXIT(rp);
	   erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS);
	   if (have_pending_exit)
	       ERTS_BIF_AWAIT_X_DATA_TRAP(BIF_P, BIF_ARG_1, am_false);
	   else
	       BIF_RET(am_true);
       }
   }
   else if(is_external_pid(BIF_ARG_1)) {
       if(external_pid_dist_entry(BIF_ARG_1) == erts_this_dist_entry)
	   BIF_RET(am_false); /* A pid from an old incarnation of this node */
       else
	   BIF_ERROR(BIF_P, BADARG);
   }
   else {
      BIF_ERROR(BIF_P, BADARG);
   }
}

BIF_RETTYPE process_display_2(BIF_ALIST_2)
{
   Process *rp;

   if (BIF_ARG_2 != am_backtrace)
       BIF_ERROR(BIF_P, BADARG);

   rp = erts_pid2proc_nropt(BIF_P, ERTS_PROC_LOCK_MAIN,
			    BIF_ARG_1, ERTS_PROC_LOCKS_ALL);
   if(!rp) {
       BIF_ERROR(BIF_P, BADARG);
   }
   if (rp == ERTS_PROC_LOCK_BUSY)
       ERTS_BIF_YIELD2(bif_export[BIF_process_display_2], BIF_P,
		       BIF_ARG_1, BIF_ARG_2);
   if (rp != BIF_P && ERTS_PROC_PENDING_EXIT(rp)) {
       Eterm args[2] = {BIF_ARG_1, BIF_ARG_2};
       erts_smp_proc_unlock(rp, ERTS_PROC_LOCKS_ALL);
       ERTS_BIF_AWAIT_X_APPLY_TRAP(BIF_P,
				   BIF_ARG_1,
				   am_erlang,
				   am_process_display,
				   args,
				   2);
   }
   erts_stack_dump(ERTS_PRINT_STDERR, NULL, rp);
#ifdef ERTS_SMP
   erts_smp_proc_unlock(rp, (BIF_P == rp
			     ? ERTS_PROC_LOCKS_ALL_MINOR
			     : ERTS_PROC_LOCKS_ALL));
#endif
   BIF_RET(am_true);
}


/* this is a general call which return some possibly useful information */

BIF_RETTYPE statistics_1(BIF_ALIST_1)
{
    Eterm res;
    Eterm* hp;

    if (BIF_ARG_1 == am_context_switches) {
	Eterm cs = erts_make_integer(erts_get_total_context_switches(), BIF_P);
	hp = HAlloc(BIF_P, 3);
	res = TUPLE2(hp, cs, SMALL_ZERO);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_garbage_collection) {
	Uint hsz = 4;
	ErtsGCInfo gc_info;
	Eterm gcs;
	Eterm recl;
	erts_gc_info(&gc_info);
	(void) erts_bld_uint(NULL, &hsz, gc_info.garbage_collections);
	(void) erts_bld_uint(NULL, &hsz, gc_info.reclaimed);
	hp = HAlloc(BIF_P, hsz);
	gcs = erts_bld_uint(&hp, NULL, gc_info.garbage_collections);
	recl = erts_bld_uint(&hp, NULL, gc_info.reclaimed);
	res = TUPLE3(hp, gcs, recl, SMALL_ZERO);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_reductions) {
	Uint reds;
	Uint diff;
	Uint hsz = 3;
	Eterm b1, b2;

	erts_get_total_reductions(&reds, &diff);
	(void) erts_bld_uint(NULL, &hsz, reds);
	(void) erts_bld_uint(NULL, &hsz, diff);
	hp = HAlloc(BIF_P, hsz);
	b1 = erts_bld_uint(&hp, NULL, reds);
	b2 = erts_bld_uint(&hp, NULL, diff);
	res = TUPLE2(hp, b1, b2); 
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_exact_reductions) {
	Uint reds;
	Uint diff;
	Uint hsz = 3;
	Eterm b1, b2;

	erts_get_exact_total_reductions(BIF_P, &reds, &diff);
	(void) erts_bld_uint(NULL, &hsz, reds);
	(void) erts_bld_uint(NULL, &hsz, diff);
	hp = HAlloc(BIF_P, hsz);
	b1 = erts_bld_uint(&hp, NULL, reds);
	b2 = erts_bld_uint(&hp, NULL, diff);
	res = TUPLE2(hp, b1, b2); 
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_runtime) {
	unsigned long u1, u2, dummy;
	Eterm b1, b2;
	elapsed_time_both(&u1,&dummy,&u2,&dummy);
	b1 = erts_make_integer(u1,BIF_P);
	b2 = erts_make_integer(u2,BIF_P);
	hp = HAlloc(BIF_P,3);
	res = TUPLE2(hp, b1, b2);
	BIF_RET(res);
    } else if (BIF_ARG_1 ==  am_run_queue) {
	res = erts_run_queues_len(NULL);
	BIF_RET(make_small(res));
    } else if (BIF_ARG_1 == am_wall_clock) {
	UWord w1, w2;
	Eterm b1, b2;
	wall_clock_elapsed_time_both(&w1, &w2);
	b1 = erts_make_integer((Uint) w1,BIF_P);
	b2 = erts_make_integer((Uint) w2,BIF_P);
	hp = HAlloc(BIF_P,3);
	res = TUPLE2(hp, b1, b2);
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_io) {
	Eterm r1, r2;
	Eterm in, out;
	Uint hsz = 9;
	Uint bytes_in = (Uint) erts_smp_atomic_read(&erts_bytes_in);
	Uint bytes_out = (Uint) erts_smp_atomic_read(&erts_bytes_out);

	(void) erts_bld_uint(NULL, &hsz, bytes_in);
	(void) erts_bld_uint(NULL, &hsz, bytes_out);
	hp = HAlloc(BIF_P, hsz);
	in = erts_bld_uint(&hp, NULL, bytes_in);
	out = erts_bld_uint(&hp, NULL, bytes_out);

	r1 = TUPLE2(hp,  am_input, in);
	hp += 3;
	r2 = TUPLE2(hp, am_output, out);
	hp += 3;
	BIF_RET(TUPLE2(hp, r1, r2));
    }
    else if (ERTS_IS_ATOM_STR("run_queues", BIF_ARG_1)) {
	Eterm res, *hp, **hpp;
	Uint sz, *szp;
	int no_qs = erts_no_run_queues;
	Uint *qszs = erts_alloc(ERTS_ALC_T_TMP,sizeof(Uint)*no_qs*2);
	(void) erts_run_queues_len(qszs);
	sz = 0;
	szp = &sz;
	hpp = NULL;
	while (1) {
	    int i;
	    for (i = 0; i < no_qs; i++)
		qszs[no_qs+i] = erts_bld_uint(hpp, szp, qszs[i]);
	    res = erts_bld_tuplev(hpp, szp, no_qs, &qszs[no_qs]);
	    if (hpp) {
		erts_free(ERTS_ALC_T_TMP, qszs);
		BIF_RET(res);
	    }
	    hp = HAlloc(BIF_P, sz);
	    szp = NULL;
	    hpp = &hp;
	}
    }
    BIF_ERROR(BIF_P, BADARG);
}

BIF_RETTYPE memory_0(BIF_ALIST_0)
{
    BIF_RETTYPE res = erts_memory(NULL, NULL, BIF_P, THE_NON_VALUE);
    switch (res) {
    case am_badarg: BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR); /* never... */
    case am_notsup: BIF_ERROR(BIF_P, EXC_NOTSUP);
    default: BIF_RET(res);
    }
}

BIF_RETTYPE memory_1(BIF_ALIST_1)
{
    BIF_RETTYPE res = erts_memory(NULL, NULL, BIF_P, BIF_ARG_1);
    switch (res) {
    case am_badarg: BIF_ERROR(BIF_P, BADARG);
    case am_notsup: BIF_ERROR(BIF_P, EXC_NOTSUP);
    default: BIF_RET(res);
    }
}

BIF_RETTYPE error_logger_warning_map_0(BIF_ALIST_0)
{
    BIF_RET(erts_error_logger_warnings);
}

static erts_smp_atomic_t available_internal_state;

BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
{
    /*
     * NOTE: Only supposed to be used for testing, and debugging.
     */

    if (!erts_smp_atomic_read(&available_internal_state)) {
	BIF_ERROR(BIF_P, EXC_UNDEF);
    }

    if (is_atom(BIF_ARG_1)) {
	if (ERTS_IS_ATOM_STR("reds_left", BIF_ARG_1)) {
	    /* Used by (emulator) */
	    BIF_RET(make_small((Uint) ERTS_BIF_REDS_LEFT(BIF_P)));
	}
	else if (ERTS_IS_ATOM_STR("node_and_dist_references", BIF_ARG_1)) {
	    /* Used by node_container_SUITE (emulator) */
	    Eterm res = erts_get_node_and_dist_references(BIF_P);
	    BIF_RET(res);
	}
	else if (ERTS_IS_ATOM_STR("monitoring_nodes", BIF_ARG_1)) {
	    BIF_RET(erts_processes_monitoring_nodes(BIF_P));
	}
	else if (ERTS_IS_ATOM_STR("next_pid", BIF_ARG_1)
		 || ERTS_IS_ATOM_STR("next_port", BIF_ARG_1)) {
	    /* Used by node_container_SUITE (emulator) */
	    Eterm res;
	    if (ERTS_IS_ATOM_STR("next_pid", BIF_ARG_1))
		res = erts_test_next_pid(0, 0);
	    else {
		res = erts_test_next_port(0, 0);
	    }
	    if (res < 0)
		BIF_RET(am_false);
	    BIF_RET(erts_make_integer(res, BIF_P));
	}
	else if (ERTS_IS_ATOM_STR("DbTable_words", BIF_ARG_1)) {
	    /* Used by ets_SUITE (stdlib) */
	    size_t words = (sizeof(DbTable) + sizeof(Uint) - 1)/sizeof(Uint);
	    BIF_RET(make_small((Uint) words));
	}
	else if (ERTS_IS_ATOM_STR("check_io_debug", BIF_ARG_1)) {
	    /* Used by (emulator) */
	    int res;
#ifdef HAVE_ERTS_CHECK_IO_DEBUG
	    erts_smp_proc_unlock(BIF_P,ERTS_PROC_LOCK_MAIN);
	    res = erts_check_io_debug();
	    erts_smp_proc_lock(BIF_P,ERTS_PROC_LOCK_MAIN);
#else
	    res = 0;
#endif
	    ASSERT(res >= 0);
	    BIF_RET(erts_make_integer((Uint) res, BIF_P));
	}
	else if (ERTS_IS_ATOM_STR("process_info_args", BIF_ARG_1)) {
	    /* Used by process_SUITE (emulator) */
	    int i;
	    Eterm res = NIL;
	    Uint *hp = HAlloc(BIF_P, 2*ERTS_PI_ARGS);
	    for (i = ERTS_PI_ARGS-1; i >= 0; i--) {
		res = CONS(hp, pi_args[i], res);
		hp += 2;
	    }
	    BIF_RET(res);
	}
	else if (ERTS_IS_ATOM_STR("processes", BIF_ARG_1)) {
	    /* Used by process_SUITE (emulator) */
	    BIF_RET(erts_debug_processes(BIF_P));
	}
	else if (ERTS_IS_ATOM_STR("processes_bif_info", BIF_ARG_1)) {
	    /* Used by process_SUITE (emulator) */
	    BIF_RET(erts_debug_processes_bif_info(BIF_P));
	}
	else if (ERTS_IS_ATOM_STR("max_atom_out_cache_index", BIF_ARG_1)) {
	    /* Used by distribution_SUITE (emulator) */
	    BIF_RET(make_small((Uint) erts_debug_max_atom_out_cache_index()));
	}
	else if (ERTS_IS_ATOM_STR("nbalance", BIF_ARG_1)) {
	    Uint n;
	    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	    n = erts_debug_nbalance();
	    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
	    BIF_RET(erts_make_integer(n, BIF_P));
	}
	else if (ERTS_IS_ATOM_STR("available_internal_state", BIF_ARG_1)) {
	    BIF_RET(am_true);
	}
	else if (ERTS_IS_ATOM_STR("force_heap_frags", BIF_ARG_1)) {
#ifdef FORCE_HEAP_FRAGS
	    BIF_RET(am_true);
#else
	    BIF_RET(am_false);
#endif
	}
    }
    else if (is_tuple(BIF_ARG_1)) {
	Eterm* tp = tuple_val(BIF_ARG_1);
	switch (arityval(tp[0])) {
	case 2: {
	    if (ERTS_IS_ATOM_STR("process_status", tp[1])) {
		/* Used by timer process_SUITE, timer_bif_SUITE, and
		   node_container_SUITE (emulator) */
		if (is_internal_pid(tp[2])) {
		    BIF_RET(erts_process_status(BIF_P,
						ERTS_PROC_LOCK_MAIN,
						NULL,
						tp[2]));
		}
	    }
	    else if (ERTS_IS_ATOM_STR("link_list", tp[1])) {
		/* Used by erl_link_SUITE (emulator) */
		if(is_internal_pid(tp[2])) {
		    Eterm res;
		    Process *p;

		    p = erts_pid2proc(BIF_P,
				      ERTS_PROC_LOCK_MAIN,
				      tp[2],
				      ERTS_PROC_LOCK_LINK);
		    if (!p) {
			ERTS_SMP_ASSERT_IS_NOT_EXITING(BIF_P);
			BIF_RET(am_undefined);
		    }
		    res = make_link_list(BIF_P, p->nlinks, NIL);
		    erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
		    BIF_RET(res);
		}
		else if(is_internal_port(tp[2])) {
		    Eterm res;
		    Port *p = erts_id2port(tp[2], BIF_P, ERTS_PROC_LOCK_MAIN);
		    if(!p)
			BIF_RET(am_undefined);
		    res = make_link_list(BIF_P, p->nlinks, NIL);
		    erts_smp_port_unlock(p);
		    BIF_RET(res);
		}
		else if(is_node_name_atom(tp[2])) {
		    DistEntry *dep = erts_find_dist_entry(tp[2]);
		    if(dep) {
			Eterm subres;
			erts_smp_de_links_lock(dep);
			subres = make_link_list(BIF_P, dep->nlinks, NIL);
			subres = make_link_list(BIF_P, dep->node_links, subres);
			erts_smp_de_links_unlock(dep);
			erts_deref_dist_entry(dep);
			BIF_RET(subres);
		    } else {
			BIF_RET(am_undefined);
		    }
		}
	    }
	    else if (ERTS_IS_ATOM_STR("monitor_list", tp[1])) {
		/* Used by erl_link_SUITE (emulator) */
		if(is_internal_pid(tp[2])) {
		    Process *p;
		    Eterm res;

		    p = erts_pid2proc(BIF_P,
				      ERTS_PROC_LOCK_MAIN,
				      tp[2],
				      ERTS_PROC_LOCK_LINK);
		    if (!p) {
			ERTS_SMP_ASSERT_IS_NOT_EXITING(BIF_P);
			BIF_RET(am_undefined);
		    }
		    res = make_monitor_list(BIF_P, p->monitors);
		    erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
		    BIF_RET(res);
		} else if(is_node_name_atom(tp[2])) {
		    DistEntry *dep = erts_find_dist_entry(tp[2]);
		    if(dep) {
			Eterm ml;
			erts_smp_de_links_lock(dep);
			ml = make_monitor_list(BIF_P, dep->monitors);
			erts_smp_de_links_unlock(dep);
			erts_deref_dist_entry(dep);
			BIF_RET(ml);
		    } else {
			BIF_RET(am_undefined);
		    }
		}
	    }
	    else if (ERTS_IS_ATOM_STR("channel_number", tp[1])) {
		Eterm res;
		DistEntry *dep = erts_find_dist_entry(tp[2]);
		if (!dep)
		    res = am_undefined;
		else {
		    Uint cno = dist_entry_channel_no(dep);
		    res = make_small(cno);
		    erts_deref_dist_entry(dep);
		}
		BIF_RET(res);
	    }
	    else if (ERTS_IS_ATOM_STR("have_pending_exit", tp[1])) {
		Process *rp = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN,
					    tp[2], ERTS_PROC_LOCK_STATUS);
		if (!rp) {
		    BIF_RET(am_undefined);
		}
		else {
		    Eterm res = ERTS_PROC_PENDING_EXIT(rp) ? am_true : am_false;
		    erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS);
		    BIF_RET(res);
		}
	    }
	    else if (ERTS_IS_ATOM_STR("binary_info", tp[1])) {
		Eterm bin = tp[2];
		if (is_binary(bin)) {
		    Eterm real_bin = bin;
		    Eterm res = am_true;
		    ErlSubBin* sb = (ErlSubBin *) binary_val(real_bin);

		    if (sb->thing_word == HEADER_SUB_BIN) {
			real_bin = sb->orig;
		    }
		    if (*binary_val(real_bin) == HEADER_PROC_BIN) {
			ProcBin* pb;
			Binary* val;
			Eterm SzTerm;
			Uint hsz = 3 + 5;
			Eterm* hp;
			DECL_AM(refc_binary);

			pb = (ProcBin *) binary_val(real_bin);
			val = pb->val;
			(void) erts_bld_uint(NULL, &hsz, pb->size);
			(void) erts_bld_uint(NULL, &hsz, val->orig_size);
			hp = HAlloc(BIF_P, hsz);

			/* Info about the Binary* object */
			SzTerm = erts_bld_uint(&hp, NULL, val->orig_size);
			res = TUPLE2(hp, am_binary, SzTerm);
			hp += 3;

			/* Info about the ProcBin* object */
			SzTerm = erts_bld_uint(&hp, NULL, pb->size);
			res = TUPLE4(hp, AM_refc_binary, SzTerm,
				     res, make_small(pb->flags));
		    } else {	/* heap binary */
			DECL_AM(heap_binary);
			res = AM_heap_binary;
		    }
		    BIF_RET(res);
		}
	    }
	    else if (ERTS_IS_ATOM_STR("term_to_binary_no_funs", tp[1])) {
		Uint dflags = (DFLAG_EXTENDED_REFERENCES |
			       DFLAG_EXTENDED_PIDS_PORTS |
			       DFLAG_BIT_BINARIES);
		BIF_RET(erts_term_to_binary(BIF_P, tp[2], 0, dflags));
	    }
	    else if (ERTS_IS_ATOM_STR("dist_port", tp[1])) {
		Eterm res = am_undefined;
		DistEntry *dep = erts_sysname_to_connected_dist_entry(tp[2]);
		if (dep) {
		    erts_smp_de_rlock(dep);
		    if (is_internal_port(dep->cid))
			res = dep->cid;
		    erts_smp_de_runlock(dep);
		    erts_deref_dist_entry(dep);
		}
		BIF_RET(res);
	    }
	    else if (ERTS_IS_ATOM_STR("atom_out_cache_index", tp[1])) {
		/* Used by distribution_SUITE (emulator) */
		if (is_atom(tp[2])) {
		    BIF_RET(make_small(
				(Uint)
				erts_debug_atom_to_out_cache_index(tp[2])));
		}
	    }
	    else if (ERTS_IS_ATOM_STR("fake_scheduler_bindings", tp[1])) {
		return erts_fake_scheduler_bindings(BIF_P, tp[2]);
	    }
	    break;
	}
	default:
	    break;
	}
    }
    BIF_ERROR(BIF_P, BADARG);
}

static erts_smp_atomic_t hipe_test_reschedule_flag;

BIF_RETTYPE erts_debug_set_internal_state_2(BIF_ALIST_2)
{
    /*
     * NOTE: Only supposed to be used for testing, and debugging.
     */
    if (ERTS_IS_ATOM_STR("available_internal_state", BIF_ARG_1)
	&& (BIF_ARG_2 == am_true || BIF_ARG_2 == am_false)) {
	long on = (long) (BIF_ARG_2 == am_true);
	long prev_on = erts_smp_atomic_xchg(&available_internal_state, on);
	if (on) {
	    erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
	    erts_dsprintf(dsbufp, "Process %T ", BIF_P->id);
	    if (erts_is_alive)
		erts_dsprintf(dsbufp, "on node %T ", erts_this_node->sysname);
	    erts_dsprintf(dsbufp,
			  "enabled access to the emulator internal state.\n");
	    erts_dsprintf(dsbufp,
			  "NOTE: This is an erts internal test feature and "
			  "should *only* be used by OTP test-suites.\n");
	    erts_send_warning_to_logger(BIF_P->group_leader, dsbufp);
	}
	BIF_RET(prev_on ? am_true : am_false);
    }

    if (!erts_smp_atomic_read(&available_internal_state)) {
	BIF_ERROR(BIF_P, EXC_UNDEF);
    }

    if (is_atom(BIF_ARG_1)) {
	
	if (ERTS_IS_ATOM_STR("reds_left", BIF_ARG_1)) {
	    Sint reds;
	    if (term_to_Sint(BIF_ARG_2, &reds) != 0) {
		if (0 <= reds && reds <= CONTEXT_REDS) {
		    if (!ERTS_PROC_GET_SAVED_CALLS_BUF(BIF_P))
			BIF_P->fcalls = reds;
		    else
			BIF_P->fcalls = reds - CONTEXT_REDS;
		}
		BIF_RET(am_true);
	    }
	}
	else if (ERTS_IS_ATOM_STR("block", BIF_ARG_1)
		 || ERTS_IS_ATOM_STR("sleep", BIF_ARG_1)) {
	    int block = ERTS_IS_ATOM_STR("block", BIF_ARG_1);
	    Sint ms;
	    if (term_to_Sint(BIF_ARG_2, &ms) != 0) {
		if (ms > 0) {
		    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
		    if (block)
			erts_smp_block_system(0);
		    while (erts_milli_sleep((long) ms) != 0);
		    if (block)
			erts_smp_release_system();
		    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
		}
		BIF_RET(am_true);
	    }
	}
	else if (ERTS_IS_ATOM_STR("block_scheduler", BIF_ARG_1)) {
	    Sint ms;
	    if (term_to_Sint(BIF_ARG_2, &ms) != 0) {
		if (ms > 0) {
		    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
		    while (erts_milli_sleep((long) ms) != 0);
		    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
		}
		BIF_RET(am_true);
	    }
	}
	else if (ERTS_IS_ATOM_STR("next_pid", BIF_ARG_1)
		 || ERTS_IS_ATOM_STR("next_port", BIF_ARG_1)) {
	    /* Used by node_container_SUITE (emulator) */
	    Uint next;

	    if (term_to_Uint(BIF_ARG_2, &next) != 0) {
		Eterm res;

		if (ERTS_IS_ATOM_STR("next_pid", BIF_ARG_1))
		    res = erts_test_next_pid(1, next);
		else {
		    res = erts_test_next_port(1, next);
		}
		if (res < 0)
		    BIF_RET(am_false);
		BIF_RET(erts_make_integer(res, BIF_P));
	    }
	}
	else if (ERTS_IS_ATOM_STR("force_gc", BIF_ARG_1)) {
	    /* Used by signal_SUITE (emulator) */
	    Process *rp = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN,
					BIF_ARG_2, ERTS_PROC_LOCK_MAIN);
	    if (!rp) {
		BIF_RET(am_false);
	    }
	    else {
		FLAGS(rp) |= F_FORCE_GC;
		if (BIF_P != rp)
		    erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_MAIN);
		BIF_RET(am_true);
	    }
	}
	else if (ERTS_IS_ATOM_STR("send_fake_exit_signal", BIF_ARG_1)) {
	    /* Used by signal_SUITE (emulator) */

	    /* Testcases depend on the exit being received via
	       a pending exit when the receiver is the same as
	       the caller.  */
	    if (is_tuple(BIF_ARG_2)) {
		Eterm* tp = tuple_val(BIF_ARG_2);
		if (arityval(tp[0]) == 3
		    && (is_pid(tp[1]) || is_port(tp[1]))
		    && is_internal_pid(tp[2])) {
		    int xres;
		    ErtsProcLocks rp_locks = ERTS_PROC_LOCKS_XSIG_SEND;
		    Process *rp = erts_pid2proc_opt(BIF_P, ERTS_PROC_LOCK_MAIN,
						    tp[2], rp_locks,
						    ERTS_P2P_FLG_SMP_INC_REFC);
		    if (!rp) {
			DECL_AM(dead);
			BIF_RET(AM_dead);
		    }

#ifdef ERTS_SMP
		    if (BIF_P == rp)
			rp_locks |= ERTS_PROC_LOCK_MAIN;
#endif
		    xres = erts_send_exit_signal(NULL, /* NULL in order to
							  force a pending exit
							  when we send to our
							  selves. */
						 tp[1],
						 rp,
						 &rp_locks,
						 tp[3],
						 NIL,
						 NULL,
						 0);
#ifdef ERTS_SMP
		    if (BIF_P == rp)
			rp_locks &= ~ERTS_PROC_LOCK_MAIN;
#endif
		    erts_smp_proc_unlock(rp, rp_locks);
		    erts_smp_proc_dec_refc(rp);
		    if (xres > 1) {
			DECL_AM(message);
			BIF_RET(AM_message);
		    }
		    else if (xres == 0) {
			DECL_AM(unaffected);
			BIF_RET(AM_unaffected);
		    }
		    else {
			DECL_AM(exit);
			BIF_RET(AM_exit);
		    }
		}
	    }
	}
        else if (ERTS_IS_ATOM_STR("colliding_names", BIF_ARG_1)) {
	    /* Used by ets_SUITE (stdlib) */
	    if (is_tuple(BIF_ARG_2)) {
                Eterm* tpl = tuple_val(BIF_ARG_2);
                Uint cnt;
                if (arityval(tpl[0]) == 2 && is_atom(tpl[1]) && 
                    term_to_Uint(tpl[2], &cnt)) {
                    BIF_RET(erts_ets_colliding_names(BIF_P,tpl[1],cnt));
                }
	    }
	}
	else if (ERTS_IS_ATOM_STR("binary_loop_limit", BIF_ARG_1)) {
	    /* Used by binary_module_SUITE (stdlib) */
	    Uint max_loops;
	    if (is_atom(BIF_ARG_2) && ERTS_IS_ATOM_STR("default", BIF_ARG_2)) {
		max_loops = erts_binary_set_loop_limit(-1);
		BIF_RET(make_small(max_loops));
	    } else if (term_to_Uint(BIF_ARG_2, &max_loops) != 0) {
		max_loops = erts_binary_set_loop_limit(max_loops);
		BIF_RET(make_small(max_loops));
	    }
	}
	else if (ERTS_IS_ATOM_STR("re_loop_limit", BIF_ARG_1)) {
	    /* Used by re_SUITE (stdlib) */
	    Uint max_loops;
	    if (is_atom(BIF_ARG_2) && ERTS_IS_ATOM_STR("default", BIF_ARG_2)) {
		max_loops = erts_re_set_loop_limit(-1);
		BIF_RET(make_small(max_loops));
	    } else if (term_to_Uint(BIF_ARG_2, &max_loops) != 0) {
		max_loops = erts_re_set_loop_limit(max_loops);
		BIF_RET(make_small(max_loops));
	    }
	}
	else if (ERTS_IS_ATOM_STR("unicode_loop_limit", BIF_ARG_1)) {
	    /* Used by unicode_SUITE (stdlib) */
	    Uint max_loops;
	    if (is_atom(BIF_ARG_2) && ERTS_IS_ATOM_STR("default", BIF_ARG_2)) {
		max_loops = erts_unicode_set_loop_limit(-1);
		BIF_RET(make_small(max_loops));
	    } else if (term_to_Uint(BIF_ARG_2, &max_loops) != 0) {
		max_loops = erts_unicode_set_loop_limit(max_loops);
		BIF_RET(make_small(max_loops));
	    }
	}
	else if (ERTS_IS_ATOM_STR("hipe_test_reschedule_suspend", BIF_ARG_1)) {
	    /* Used by hipe test suites */
	    long flag = erts_smp_atomic_read(&hipe_test_reschedule_flag);
	    if (!flag && BIF_ARG_2 != am_false) {
		erts_smp_atomic_set(&hipe_test_reschedule_flag, 1);
		erts_suspend(BIF_P, ERTS_PROC_LOCK_MAIN, NULL);
		ERTS_BIF_YIELD2(bif_export[BIF_erts_debug_set_internal_state_2],
				BIF_P, BIF_ARG_1, BIF_ARG_2);
	    }
	    erts_smp_atomic_set(&hipe_test_reschedule_flag, !flag);
	    BIF_RET(NIL);
	}
	else if (ERTS_IS_ATOM_STR("hipe_test_reschedule_resume", BIF_ARG_1)) {
	    /* Used by hipe test suites */
	    Eterm res = am_false;
	    Process *rp = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN,
					BIF_ARG_2, ERTS_PROC_LOCK_STATUS);
	    if (rp) {
		erts_resume(rp, ERTS_PROC_LOCK_STATUS);
		res = am_true;
		erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS);
	    }
	    BIF_RET(res);
	}
	else if (ERTS_IS_ATOM_STR("test_long_gc_sleep", BIF_ARG_1)) {
	    if (term_to_Uint(BIF_ARG_2, &erts_test_long_gc_sleep) > 0)
		BIF_RET(am_true);
	}
	else if (ERTS_IS_ATOM_STR("abort", BIF_ARG_1)) {
	    erl_exit(ERTS_ABORT_EXIT, "%T\n", BIF_ARG_2);
	}
	else if (ERTS_IS_ATOM_STR("kill_dist_connection", BIF_ARG_1)) {
	    DistEntry *dep = erts_sysname_to_connected_dist_entry(BIF_ARG_2);
	    if (!dep)
		BIF_RET(am_false);
	    else {
		Uint32 con_id;
		erts_smp_de_rlock(dep);
		con_id = dep->connection_id;
		erts_smp_de_runlock(dep);
		erts_kill_dist_connection(dep, con_id);
		erts_deref_dist_entry(dep);
		BIF_RET(am_true);
	    }
	}
	else if (ERTS_IS_ATOM_STR("not_running_optimization", BIF_ARG_1)) {
#ifdef ERTS_SMP
	    int old_use_opt, use_opt;
	    switch (BIF_ARG_2) {
	    case am_true:
		use_opt = 1;
		break;
	    case am_false:
		use_opt = 0;
		break;
	    default:
		BIF_ERROR(BIF_P, BADARG);
	    }

	    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	    erts_smp_block_system(0);
	    old_use_opt = !erts_disable_proc_not_running_opt;
	    erts_disable_proc_not_running_opt = !use_opt;
	    erts_smp_release_system();
	    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
	    BIF_RET(old_use_opt ? am_true : am_false);
#else
	    BIF_ERROR(BIF_P,  EXC_NOTSUP);
#endif
	}
    }

    BIF_ERROR(BIF_P, BADARG);
}

#ifdef ERTS_ENABLE_LOCK_COUNT
static Eterm lcnt_build_lock_stats_term(Eterm **hpp, Uint *szp, erts_lcnt_lock_stats_t *stats, Eterm res) {
    unsigned long tries = 0, colls = 0;
    unsigned long timer_s = 0, timer_ns = 0, timer_n = 0;
    unsigned int  line = 0;
    
    Eterm af, uil;
    Eterm uit, uic;
    Eterm uits, uitns, uitn;
    Eterm tt, tstat, tloc, t;
	
    /* term:
     * [{{file, line}, {tries, colls, {seconds, nanoseconds, n_blocks}}}]
     */
    
    ethr_atomic_read(&stats->tries, (long *)&tries);
    ethr_atomic_read(&stats->colls, (long *)&colls);
   
    line     = stats->line; 
    timer_s  = stats->timer.s;
    timer_ns = stats->timer.ns;
    timer_n  = stats->timer_n;
   
    af    = am_atom_put(stats->file, strlen(stats->file)); 
    uil   = erts_bld_uint( hpp, szp, line);
    tloc  = erts_bld_tuple(hpp, szp, 2, af, uil);
    
    uit   = erts_bld_uint( hpp, szp, tries);             
    uic   = erts_bld_uint( hpp, szp, colls);             
    
    uits  = erts_bld_uint( hpp, szp, timer_s);
    uitns = erts_bld_uint( hpp, szp, timer_ns);
    uitn  = erts_bld_uint( hpp, szp, timer_n);
    tt    = erts_bld_tuple(hpp, szp, 3, uits, uitns, uitn);

    tstat = erts_bld_tuple(hpp, szp, 3, uit, uic, tt);
    
    t     = erts_bld_tuple(hpp, szp, 2, tloc, tstat);
    
    res   = erts_bld_cons( hpp, szp, t, res);

    return res;
}

static Eterm lcnt_build_lock_term(Eterm **hpp, Uint *szp, erts_lcnt_lock_t *lock, Eterm res) {
    Eterm name, type, id, stats = NIL, t;
    Process *proc = NULL;
    char *ltype;
    int i;
    
    /* term:
     * [{name, id, type, stats()}] 
     */
	
    ASSERT(lock->name);
    
    ltype = erts_lcnt_lock_type(lock->flag);
    
    ASSERT(ltype);
    
    type  = am_atom_put(ltype, strlen(ltype));           
    name  = am_atom_put(lock->name, strlen(lock->name)); 

    if (lock->flag & ERTS_LCNT_LT_ALLOC) {
	/* use allocator types names as id's for allocator locks */
	ltype = (char *) ERTS_ALC_A2AD(signed_val(lock->id));
	id    = am_atom_put(ltype, strlen(ltype));
    } else if (lock->flag & ERTS_LCNT_LT_PROCLOCK) {
	/* use registered names as id's for process locks if available */
	proc  = erts_pid2proc_unlocked(lock->id);
	if (proc && proc->reg) {
	    id = proc->reg->name;
	} else {
	    /* otherwise use process id */
	    id = lock->id;
	}
    } else {
	id    = lock->id;                                    
    }
    
    for (i = 0; i < lock->n_stats; i++) {
	stats = lcnt_build_lock_stats_term(hpp, szp, &(lock->stats[i]), stats);
    }
	
    t     = erts_bld_tuple(hpp, szp, 4, name, id, type, stats);
    
    res   = erts_bld_cons( hpp, szp, t, res);          

    return res;
}

static Eterm lcnt_build_result_term(Eterm **hpp, Uint *szp, erts_lcnt_data_t *data, Eterm res) {
    Eterm dts, dtns, tdt, adur, tdur, aloc, lloc = NIL, tloc;
    erts_lcnt_lock_t *lock = NULL;
    char *str_duration = "duration";
    char *str_locks    = "locks";
    
    /* term:
     * [{'duration', {seconds, nanoseconds}}, {'locks', locks()}]
     */
   
    /* duration tuple */ 
    dts  = erts_bld_uint( hpp, szp, data->duration.s);
    dtns = erts_bld_uint( hpp, szp, data->duration.ns);
    tdt  = erts_bld_tuple(hpp, szp, 2, dts, dtns);
    
    adur = am_atom_put(str_duration, strlen(str_duration));
    tdur = erts_bld_tuple(hpp, szp, 2, adur, tdt);
   
    /* lock tuple */
    
    aloc = am_atom_put(str_locks, strlen(str_locks));
    	
    for (lock = data->current_locks->head; lock != NULL ; lock = lock->next ) {
	lloc = lcnt_build_lock_term(hpp, szp, lock, lloc);
    }
    
    for (lock = data->deleted_locks->head; lock != NULL ; lock = lock->next ) {
	lloc = lcnt_build_lock_term(hpp, szp, lock, lloc);
    }
    
    tloc = erts_bld_tuple(hpp, szp, 2, aloc, lloc);
    
    res  = erts_bld_cons( hpp, szp, tloc, res);          
    res  = erts_bld_cons( hpp, szp, tdur, res);          

    return res;
}    
#endif

BIF_RETTYPE erts_debug_lock_counters_1(BIF_ALIST_1)
{
#ifdef ERTS_ENABLE_LOCK_COUNT
    Eterm res = NIL;
#endif


    if (BIF_ARG_1 == am_enabled) {
#ifdef ERTS_ENABLE_LOCK_COUNT
	BIF_RET(am_true);
#else
	BIF_RET(am_false);
#endif
    }
#ifdef ERTS_ENABLE_LOCK_COUNT

    else if (BIF_ARG_1 == am_info) {
	erts_lcnt_data_t *data; 
	Uint hsize = 0;
	Uint *szp;
    	Eterm* hp;

	erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	erts_smp_block_system(0);

	erts_lcnt_set_rt_opt(ERTS_LCNT_OPT_SUSPEND);
	data = erts_lcnt_get_data();

	/* calculate size */

	szp = &hsize;
	lcnt_build_result_term(NULL, szp, data, NIL);

	/* alloc and build */

	hp = HAlloc(BIF_P, hsize);

	res = lcnt_build_result_term(&hp, NULL, data, res);
	
	erts_lcnt_clear_rt_opt(ERTS_LCNT_OPT_SUSPEND);

	erts_smp_release_system();
	erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
	
	BIF_RET(res);
    } else if (BIF_ARG_1 == am_clear) {
	erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	erts_smp_block_system(0);

	erts_lcnt_clear_counters();

	erts_smp_release_system();
	erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);

	BIF_RET(am_ok);
    } else if (is_tuple(BIF_ARG_1)) {
	Eterm* tp = tuple_val(BIF_ARG_1);

	switch (arityval(tp[0])) {
	    case 2:
		if (ERTS_IS_ATOM_STR("copy_save", tp[1])) {
		    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
		    erts_smp_block_system(0);
		    if (tp[2] == am_true) {

			res = erts_lcnt_set_rt_opt(ERTS_LCNT_OPT_COPYSAVE) ? am_true : am_false;

		    } else if (tp[2] == am_false) {

			res = erts_lcnt_clear_rt_opt(ERTS_LCNT_OPT_COPYSAVE) ? am_true : am_false;

		    } else {
			erts_smp_release_system();
			erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
			BIF_ERROR(BIF_P, BADARG);
		    }
		    erts_smp_release_system();
		    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
		    BIF_RET(res);

		} else if (ERTS_IS_ATOM_STR("process_locks", tp[1])) {
		    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
		    erts_smp_block_system(0);
		    if (tp[2] == am_true) {

			res = erts_lcnt_set_rt_opt(ERTS_LCNT_OPT_PROCLOCK) ? am_true : am_false;

		    } else if (tp[2] == am_false) {

			res = erts_lcnt_set_rt_opt(ERTS_LCNT_OPT_PROCLOCK) ? am_true : am_false;

		    } else {
			erts_smp_release_system();
			erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
			BIF_ERROR(BIF_P, BADARG);
		    }
		    erts_smp_release_system();
		    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
		    BIF_RET(res);
		 }
	    break;
     
	    default:
	    break;
	}
    } 

#endif 
    BIF_ERROR(BIF_P, BADARG);
}

void
erts_bif_info_init(void)
{
    erts_smp_atomic_init(&available_internal_state, 0);
    erts_smp_atomic_init(&hipe_test_reschedule_flag, 0);

    process_info_init();
}