Line data Source code
1 : #include "fd_shred_dest.h"
2 :
3 : struct pubkey_to_idx {
4 : fd_pubkey_t key;
5 : ulong idx;
6 : };
7 : typedef struct pubkey_to_idx pubkey_to_idx_t;
8 :
9 : const fd_pubkey_t null_pubkey = {{ 0 }};
10 :
11 : #define MAP_NAME pubkey_to_idx
12 243214044 : #define MAP_T pubkey_to_idx_t
13 2960112825 : #define MAP_KEY_T fd_pubkey_t
14 828688224 : #define MAP_KEY_NULL null_pubkey
15 : #define MAP_KEY_EQUAL_IS_SLOW 1
16 : #define MAP_MEMOIZE 0
17 2960112825 : #define MAP_KEY_INVAL(k) MAP_KEY_EQUAL((k),MAP_KEY_NULL)
18 5686081800 : #define MAP_KEY_EQUAL(k0,k1) (!memcmp( (k0).key, (k1).key, 32UL ))
19 242588178 : #define MAP_KEY_HASH(key) ((MAP_HASH_T)( (key).ul[1] ))
20 :
21 : #include "../../util/tmpl/fd_map_dynamic.c"
22 :
23 :
24 : /* This 45 byte struct gets hashed to compute the seed for Chacha20 to
25 : compute the shred destinations. */
26 : struct __attribute__((packed)) shred_dest_input {
27 : ulong slot;
28 : uchar type; /* Data = 0b1010_0101, Code = 0b0101_1010 */
29 : uint idx;
30 : uchar leader_pubkey[32];
31 : };
32 : typedef struct shred_dest_input shred_dest_input_t;
33 :
34 : ulong
35 120612 : fd_shred_dest_footprint( ulong staked_cnt, ulong unstaked_cnt ) {
36 120612 : ulong cnt = staked_cnt+unstaked_cnt;
37 120612 : int lg_cnt = fd_ulong_find_msb( fd_ulong_pow2_up( 2UL*fd_ulong_max( cnt, 1UL ) ) );
38 120612 : return FD_LAYOUT_FINI( FD_LAYOUT_APPEND( FD_LAYOUT_APPEND( FD_LAYOUT_APPEND( FD_LAYOUT_APPEND( FD_LAYOUT_APPEND(
39 120612 : FD_LAYOUT_INIT,
40 120612 : fd_shred_dest_align(), sizeof(fd_shred_dest_t) ),
41 120612 : pubkey_to_idx_align(), pubkey_to_idx_footprint( lg_cnt ) ),
42 120612 : alignof(fd_shred_dest_weighted_t), sizeof(fd_shred_dest_weighted_t)*cnt ),
43 120612 : fd_wsample_align(), fd_wsample_footprint( staked_cnt, 1 )),
44 120612 : alignof(ulong), sizeof(ulong)*unstaked_cnt ),
45 120612 : FD_SHRED_DEST_ALIGN );
46 120612 : }
47 :
48 :
49 : void *
50 : fd_shred_dest_new( void * mem,
51 : fd_shred_dest_weighted_t const * info,
52 : ulong cnt,
53 : fd_epoch_leaders_t const * lsched,
54 : fd_pubkey_t const * source,
55 312939 : ulong excluded_stake ) {
56 :
57 312939 : if( FD_UNLIKELY( !mem ) ) {
58 3 : FD_LOG_WARNING(( "NULL mem" ));
59 3 : return NULL;
60 3 : }
61 :
62 312936 : if( FD_UNLIKELY( !fd_ulong_is_aligned( (ulong)mem, fd_shred_dest_align() ) ) ) {
63 3 : FD_LOG_WARNING(( "misaligned mem" ));
64 3 : return NULL;
65 3 : }
66 :
67 312933 : int lg_cnt = fd_ulong_find_msb( fd_ulong_pow2_up( 2UL*fd_ulong_max( cnt, 1UL ) ) );
68 312933 : FD_SCRATCH_ALLOC_INIT( footprint, mem );
69 312933 : fd_shred_dest_t * sdest;
70 312933 : /* */ sdest = FD_SCRATCH_ALLOC_APPEND( footprint, fd_shred_dest_align(), sizeof(fd_shred_dest_t) );
71 312933 : void * _map = FD_SCRATCH_ALLOC_APPEND( footprint, pubkey_to_idx_align(), pubkey_to_idx_footprint( lg_cnt ) );
72 312933 : void * _info = FD_SCRATCH_ALLOC_APPEND( footprint, alignof(fd_shred_dest_weighted_t), sizeof(fd_shred_dest_weighted_t)*cnt );
73 :
74 0 : ulong cnts[2] = { 0UL, 0UL }; /* cnts[0] = staked, cnts[1] = unstaked */
75 :
76 312933 : fd_shred_dest_weighted_t * copy = (fd_shred_dest_weighted_t *)_info;
77 234456783 : for( ulong i=0UL; i<cnt; i++ ) {
78 234143850 : copy[i] = info[i];
79 234143850 : ulong stake = info[i].stake_lamports;
80 : /* Check to make we never have a staked node following an unstaked
81 : node, which would mean info is not sorted properly. */
82 234143850 : if( FD_UNLIKELY( (stake>0UL) & (cnts[1]>0UL) ) ) {
83 0 : FD_LOG_WARNING(( "info was not sorted properly. info[%lu] has non-zero stake %lu but follows an unstaked node", i, stake ));
84 0 : return NULL;
85 0 : }
86 234143850 : cnts[ stake==0UL ]++;
87 234143850 : }
88 :
89 312933 : ulong staked_cnt = cnts[0];
90 312933 : ulong unstaked_cnt = cnts[1];
91 :
92 312933 : if( FD_UNLIKELY( (excluded_stake>0UL) & (unstaked_cnt>0UL) ) ) {
93 : /* If excluded stake > 0, then the list must be filled with staked nodes. */
94 0 : FD_LOG_WARNING(( "cannot have excluded stake and unstaked validators" ));
95 0 : return NULL;
96 0 : }
97 :
98 312933 : void * _wsample = FD_SCRATCH_ALLOC_APPEND( footprint, fd_wsample_align(), fd_wsample_footprint( staked_cnt, 1 ));
99 312933 : void * _unstaked = FD_SCRATCH_ALLOC_APPEND( footprint, alignof(ulong), sizeof(ulong)*unstaked_cnt );
100 :
101 :
102 312933 : fd_chacha20rng_t * rng = fd_chacha20rng_join( fd_chacha20rng_new( sdest->rng, FD_CHACHA20RNG_MODE_SHIFT ) );
103 :
104 312933 : void * _staked = fd_wsample_new_init( _wsample, rng, staked_cnt, 1, FD_WSAMPLE_HINT_POWERLAW_REMOVE );
105 :
106 201238560 : for( ulong i=0UL; i<staked_cnt; i++ ) _staked = fd_wsample_new_add( _staked, info[i].stake_lamports );
107 312933 : _staked = fd_wsample_new_fini( _staked, excluded_stake );
108 :
109 312933 : pubkey_to_idx_t * pubkey_to_idx_map = pubkey_to_idx_join( pubkey_to_idx_new( _map, lg_cnt ) );
110 234456783 : for( ulong i=0UL; i<cnt; i++ ) {
111 234143850 : pubkey_to_idx_insert( pubkey_to_idx_map, info[i].pubkey )->idx = i;
112 234143850 : }
113 312933 : pubkey_to_idx_t * query = pubkey_to_idx_query( pubkey_to_idx_map, *source, NULL );
114 312933 : if( FD_UNLIKELY( !query ) ) {
115 12 : FD_LOG_WARNING(( "source pubkey not found" ));
116 12 : return NULL;
117 12 : }
118 :
119 312921 : memset( sdest->null_dest, 0, sizeof(fd_shred_dest_weighted_t) );
120 312921 : sdest->lsched = lsched;
121 312921 : sdest->cnt = cnt;
122 312921 : sdest->all_destinations = copy;
123 312921 : sdest->staked = fd_wsample_join( _staked );
124 312921 : sdest->unstaked = _unstaked;
125 312921 : sdest->unstaked_unremoved_cnt = 0UL; /* unstaked doesn't get initialized until it's needed */
126 312921 : sdest->staked_cnt = staked_cnt;
127 312921 : sdest->unstaked_cnt = unstaked_cnt;
128 312921 : sdest->excluded_stake = excluded_stake;
129 312921 : sdest->pubkey_to_idx_map = pubkey_to_idx_map;
130 312921 : sdest->source_validator_orig_idx = query->idx;
131 :
132 312921 : return (void *)sdest;
133 312933 : }
134 :
135 312933 : fd_shred_dest_t * fd_shred_dest_join( void * mem ) { return (fd_shred_dest_t *)mem; }
136 312837 : void * fd_shred_dest_leave( fd_shred_dest_t * sdest ) { return (void *)sdest; }
137 :
138 312837 : void * fd_shred_dest_delete( void * mem ) {
139 312837 : fd_shred_dest_t * sdest = (fd_shred_dest_t *)mem;
140 :
141 312837 : fd_chacha20rng_delete( fd_chacha20rng_leave( sdest->rng ) );
142 312837 : fd_wsample_delete ( fd_wsample_leave ( sdest->staked ) );
143 312837 : pubkey_to_idx_delete ( pubkey_to_idx_leave ( sdest->pubkey_to_idx_map ) );
144 312837 : return mem;
145 312837 : }
146 :
147 : /* sample_unstaked, sample_unstaked_noprepare, and
148 : prepare_unstaked_sampling are used to perform the specific form of
149 : unweighted random sampling that Solana uses for unstaked validators.
150 : In essence, you:
151 : 1. construct a list of all the unstaked validators,
152 : 2. delete the leader (if present)
153 : then repeatedly:
154 : 3. choose the chacha20rng_roll( |unstaked| )th element.
155 : 4. swap the last element in unstaked with the chosen element
156 : 5. return and remove the chosen element (which is now in the last
157 : position, so remove is O(1)).
158 : Steps 1 and 2 are both O(|unstaked|), but they can be combined
159 : relatively easily if we wait to construct the list until we know
160 : which element we need to delete. prepare_unstaked_sampling performs
161 : steps 1 and 2. sample_unstaked performs steps 3-5. Thus, you must
162 : call prepare_unstaked_sampling prior to calling sample_unstaked.
163 :
164 : When only sampling a single element from the list, forming the whole
165 : array is wasteful; we just need to know whether the element we choose
166 : comes before or after the element we deleted.
167 : sample_unstaked_noprepare returns the same result as
168 : prepare_unstaked_sampling followed by one call to sample_unstaked.
169 : sample_unstaked_noprepare does not read or modify the unstaked array,
170 : so it can be called without calling prepare_unstaked_sampling.
171 :
172 : remove_idx is the index of the element to remove in step 2. If it is
173 : not in [sdest->staked_cnt, sdest->staked_cnt+sdest->unstaked_cnt),
174 : then it will be ignored. sample_unstaked and
175 : sample_unstaked_noprepare return the index into
176 : sdest->all_destinations of the selected sample. The returned value
177 : will be in [sdest->staked_cnt, sdest->staked_cnt+sdest->unstaked_cnt)
178 : or FD_WSAMPLE_EMPTY. */
179 : static inline ulong
180 : sample_unstaked_noprepare( fd_shred_dest_t * sdest,
181 99 : ulong remove_idx ) {
182 : /* is remove_idx in
183 : [sdest->staked_cnt, sdest->staked_cnt+sdest->unstaked_cnt) ? */
184 99 : int remove_in_interval = (sdest->staked_cnt <= remove_idx) & (remove_idx < (sdest->staked_cnt+sdest->unstaked_cnt) );
185 99 : ulong unstaked_cnt = sdest->unstaked_cnt - (ulong)remove_in_interval;
186 99 : if( FD_UNLIKELY( unstaked_cnt==0UL ) ) return FD_WSAMPLE_EMPTY;
187 :
188 99 : ulong sample = sdest->staked_cnt + fd_chacha20rng_ulong_roll( sdest->rng, unstaked_cnt );
189 99 : return fd_ulong_if( (!remove_in_interval) | (sample<remove_idx), sample, sample+1UL );
190 99 : }
191 :
192 : /* It's cheaper to initialize unstaked without the element we want to
193 : delete than to delete it after initializing, so we defer the
194 : initialization until we know who the leader is. */
195 : static inline void
196 : prepare_unstaked_sampling( fd_shred_dest_t * sdest,
197 136032 : ulong remove_idx ) {
198 136032 : int remove_in_interval = (sdest->staked_cnt <= remove_idx) & (remove_idx < (sdest->staked_cnt+sdest->unstaked_cnt) );
199 136032 : ulong unstaked_cnt = sdest->unstaked_cnt - (ulong)remove_in_interval;
200 136032 : sdest->unstaked_unremoved_cnt = unstaked_cnt;
201 136032 : if( FD_UNLIKELY( unstaked_cnt==0UL ) ) return;
202 :
203 : /* If we had to remove something in the interval, we want to make sure
204 : it doesn't occur in the list of indices. Otherwise just take them
205 : all. */
206 130227 : ulong direct_index_up_to = fd_ulong_if( remove_in_interval, remove_idx - sdest->staked_cnt, unstaked_cnt );
207 130227 : ulong i=0UL;
208 11153415 : for( ; i<direct_index_up_to; i++ ) sdest->unstaked[i] = i+sdest->staked_cnt;
209 624822 : for( ; i<unstaked_cnt; i++ ) sdest->unstaked[i] = i+sdest->staked_cnt + 1UL;
210 130227 : }
211 :
212 : static inline ulong
213 11376087 : sample_unstaked( fd_shred_dest_t * sdest ) {
214 11376087 : if( FD_UNLIKELY( sdest->unstaked_unremoved_cnt==0UL ) ) return FD_WSAMPLE_EMPTY;
215 :
216 11258799 : ulong sample = fd_chacha20rng_ulong_roll( sdest->rng, sdest->unstaked_unremoved_cnt );
217 11258799 : ulong to_return = sdest->unstaked[sample];
218 11258799 : sdest->unstaked[sample] = sdest->unstaked[--sdest->unstaked_unremoved_cnt];
219 11258799 : return to_return;
220 11376087 : }
221 :
222 :
223 : /* Returns 0 on success
224 : https://github.com/anza-xyz/agave/blob/v2.2.1/ledger/src/shred.rs#L293 */
225 : static inline int
226 : compute_seeds( fd_shred_dest_t * sdest,
227 : fd_shred_t const * const * input_shreds,
228 : ulong shred_cnt,
229 : fd_pubkey_t const * leader,
230 : ulong slot,
231 3756717 : uchar dest_hash_output[ FD_SHRED_DEST_MAX_SHRED_CNT ][ 32 ] ) {
232 :
233 3756717 : shred_dest_input_t dest_hash_inputs [ FD_SHRED_DEST_MAX_SHRED_CNT ];
234 3756717 : fd_sha256_batch_t * sha256 = fd_sha256_batch_init( sdest->_sha256_batch );
235 :
236 8263434 : for( ulong i=0UL; i<shred_cnt; i++ ) {
237 4506717 : shred_dest_input_t * h_in = dest_hash_inputs+i;
238 4506717 : fd_shred_t const * shred = input_shreds[i];
239 4506717 : if( FD_UNLIKELY( shred->slot != slot ) ) return -1;
240 :
241 4506717 : uchar shred_type = fd_shred_type( shred->variant );
242 4506717 : h_in->slot = slot;
243 4506717 : h_in->type = fd_uchar_if( fd_shred_is_data( shred_type ), 0xA5, 0x5A );
244 4506717 : h_in->idx = shred->idx;
245 4506717 : memcpy( h_in->leader_pubkey, leader, 32UL );
246 :
247 4506717 : fd_sha256_batch_add( sha256, dest_hash_inputs+i, sizeof(shred_dest_input_t), dest_hash_output[ i ] );
248 4506717 : }
249 3756717 : fd_sha256_batch_fini( sha256 );
250 3756717 : return 0;
251 3756717 : }
252 :
253 :
254 : fd_shred_dest_idx_t *
255 : fd_shred_dest_compute_first( fd_shred_dest_t * sdest,
256 : fd_shred_t const * const * input_shreds,
257 : ulong shred_cnt,
258 5820 : fd_shred_dest_idx_t * out ) {
259 :
260 5820 : if( FD_UNLIKELY( shred_cnt==0UL ) ) return out;
261 :
262 5820 : if( FD_UNLIKELY( sdest->cnt<=1UL ) ) {
263 : /* We are the only validator that we know about, and we can't send
264 : it to ourself, so there's nobody we can send the shred to. */
265 0 : for( ulong i=0UL; i<shred_cnt; i++ ) out[ i ] = FD_SHRED_DEST_NO_DEST;
266 0 : return out;
267 0 : }
268 :
269 5820 : uchar dest_hash_outputs[ FD_SHRED_DEST_MAX_SHRED_CNT ][ 32 ];
270 :
271 5820 : ulong slot = input_shreds[0]->slot;
272 5820 : fd_pubkey_t const * leader = fd_epoch_leaders_get( sdest->lsched, slot );
273 5820 : if( FD_UNLIKELY( !leader ) ) return NULL;
274 :
275 5820 : if( FD_UNLIKELY( compute_seeds( sdest, input_shreds, shred_cnt, leader, slot, dest_hash_outputs ) ) ) return NULL;
276 :
277 : /* If we're calling this, we must be the leader. That means we had
278 : some stake when the leader schedule was created, but maybe not
279 : anymore? This version of the code is safe either way, but I should
280 : probably confirm this can happen. */
281 5820 : int source_validator_is_staked = sdest->source_validator_orig_idx<sdest->staked_cnt;
282 5820 : if( FD_LIKELY( source_validator_is_staked ) )
283 4158 : fd_wsample_remove_idx( sdest->staked, sdest->source_validator_orig_idx );
284 :
285 5820 : int any_staked_candidates = sdest->staked_cnt > (ulong)source_validator_is_staked;
286 11640 : for( ulong i=0UL; i<shred_cnt; i++ ) {
287 5820 : fd_wsample_seed_rng( fd_wsample_get_rng( sdest->staked ), dest_hash_outputs[ i ] );
288 : /* Map FD_WSAMPLE_INDETERMINATE to FD_SHRED_DEST_NO_DEST */
289 5820 : if( FD_LIKELY( any_staked_candidates ) ) out[i] = (ushort)fd_ulong_min( fd_wsample_sample( sdest->staked ), FD_SHRED_DEST_NO_DEST );
290 99 : else out[i] = (ushort)sample_unstaked_noprepare( sdest, sdest->source_validator_orig_idx );
291 5820 : }
292 5820 : fd_wsample_restore_all( sdest->staked );
293 :
294 5820 : return out;
295 5820 : }
296 :
297 : fd_shred_dest_idx_t *
298 : fd_shred_dest_compute_children( fd_shred_dest_t * sdest,
299 : fd_shred_t const * const * input_shreds,
300 : ulong shred_cnt,
301 : fd_shred_dest_idx_t * out,
302 : ulong out_stride,
303 : ulong fanout,
304 : ulong dest_cnt,
305 3789198 : ulong * opt_max_dest_cnt ) {
306 :
307 : /* The logic here is a little tricky since we are keeping track of
308 : staked and unstaked separately and only logically concatenating
309 : them [staked, unstaked] , but that does allow us to skip some
310 : samples sometimes. We're operating from the source validator's
311 : perspective here, so everything in the first person singular refers
312 : to the source validator. */
313 :
314 3789198 : ulong my_orig_idx = sdest->source_validator_orig_idx;
315 3789198 : int i_am_staked = my_orig_idx<sdest->staked_cnt;
316 :
317 3789198 : fd_ulong_store_if( !!opt_max_dest_cnt, opt_max_dest_cnt, 0UL );
318 :
319 3789198 : if( FD_UNLIKELY( (shred_cnt==0UL) | (dest_cnt==0UL) ) ) return out; /* Nothing to do */
320 :
321 3789198 : ulong slot = input_shreds[0]->slot;
322 3789198 : fd_pubkey_t const * leader = fd_epoch_leaders_get ( sdest->lsched, slot );
323 3789198 : pubkey_to_idx_t * query = pubkey_to_idx_query( sdest->pubkey_to_idx_map, *leader, NULL );
324 3789198 : int leader_is_staked = query ? (query->idx<sdest->staked_cnt): 0;
325 3789198 : ulong leader_idx = query ? query->idx : ULONG_MAX;
326 3789198 : if( FD_UNLIKELY( !leader ) ) return NULL; /* Unknown slot */
327 3789198 : if( FD_UNLIKELY( leader_idx==my_orig_idx ) ) return NULL; /* I am the leader. Use compute_first */
328 :
329 3789198 : if( FD_UNLIKELY( (sdest->cnt<=1UL) | /* We don't know about a single destination, so we can't send
330 : anything. */
331 3789198 : ( (!i_am_staked) & (sdest->staked_cnt-(ulong)leader_is_staked>fanout) ) ) ) {
332 : /* My position is somewhere after all the staked nodes, which means
333 : my shuffled index is always greater than fanout. That means I'm
334 : always at the bottom of the Turbine tree so I don't have to send
335 : any shreds to anyone. */
336 19622568 : for( ulong j=0UL; j<dest_cnt; j++ ) for( ulong i=0UL; i<shred_cnt; i++ ) out[ j*out_stride + i ] = FD_SHRED_DEST_NO_DEST;
337 38301 : return out;
338 38301 : }
339 :
340 3750897 : uchar dest_hash_outputs[ FD_SHRED_DEST_MAX_SHRED_CNT ][ 32 ];
341 :
342 :
343 3750897 : if( FD_UNLIKELY( compute_seeds( sdest, input_shreds, shred_cnt, leader, slot, dest_hash_outputs ) ) ) return NULL;
344 :
345 3750897 : ulong max_dest_cnt = 0UL;
346 :
347 3750897 : ulong staked_shuffle[ sdest->staked_cnt+1UL ];
348 3750897 : ulong staked_shuffle_populated_cnt = 0UL;
349 :
350 8251794 : for( ulong i=0UL; i<shred_cnt; i++ ) {
351 : /* Remove the leader. */
352 4500897 : if( FD_LIKELY( query && leader_is_staked ) ) fd_wsample_remove_idx( sdest->staked, leader_idx );
353 :
354 4500897 : ulong my_idx = 0UL;
355 4500897 : fd_wsample_seed_rng( fd_wsample_get_rng( sdest->staked ), dest_hash_outputs[ i ] ); /* Seeds both samplers since the rng is shared */
356 :
357 4500897 : if( FD_UNLIKELY( !i_am_staked ) ) {
358 : /* If there's excluded stake, we don't know about any unstaked
359 : validators, so if I am unstaked, then I'm in the excluded
360 : region, and we have no hope of computing my position in the
361 : shuffle. */
362 37503 : if( FD_UNLIKELY( sdest->excluded_stake>0UL ) ) return NULL;
363 :
364 : /* Quickly burn through all the staked nodes since I'll be in the
365 : unstaked portion. We don't care about the values, but we need
366 : to advance the RNG the right number of times, and sadly there's
367 : no other way to do it than this. There can't be too many of
368 : them since otherwise we would have taken the quick exit at the
369 : start of the function. */
370 37503 : staked_shuffle_populated_cnt = sdest->staked_cnt + 1UL;
371 37503 : fd_wsample_sample_and_remove_many( sdest->staked, staked_shuffle, staked_shuffle_populated_cnt );
372 37503 : my_idx += sdest->staked_cnt - (ulong)(query && leader_is_staked);
373 :
374 37503 : prepare_unstaked_sampling( sdest, leader_idx );
375 342495 : while( my_idx <= fanout ) {
376 325584 : ulong sample = sample_unstaked( sdest );
377 325584 : if( FD_UNLIKELY( sample==my_orig_idx ) ) break; /* Found me! */
378 304992 : if( FD_UNLIKELY( sample==FD_WSAMPLE_EMPTY ) ) return NULL; /* I couldn't find myself. This should be impossible. */
379 304992 : my_idx++;
380 304992 : }
381 4463394 : } else {
382 4463394 : staked_shuffle_populated_cnt = fd_ulong_min( fanout+1UL, sdest->staked_cnt+1UL );
383 4463394 : fd_wsample_sample_and_remove_many( sdest->staked, staked_shuffle, staked_shuffle_populated_cnt );
384 749728224 : while( my_idx <= fanout ) {
385 : /* my_idx < fanout+1UL because of the while loop condition.
386 : my_idx < staked_cnt+1UL because my_idx==staked_cnt will
387 : trigger sample==FD_WSAMPLE_EMPTY below. Thus, this access is
388 : safe. */
389 746113935 : ulong sample = staked_shuffle[ my_idx ];
390 746113935 : if( FD_UNLIKELY( sample==my_orig_idx ) ) break; /* Found me! */
391 745264830 : if( FD_UNLIKELY( sample==FD_WSAMPLE_EMPTY ) ) return NULL; /* I couldn't find myself. This should be impossible. */
392 745264830 : if( FD_UNLIKELY( sample==FD_WSAMPLE_INDETERMINATE ) ) my_idx=ULONG_MAX-1UL; /* Hit poisoned region before myself. No
393 : clue about position. Break immediately and
394 : fill with NO_DEST below. */
395 745264830 : my_idx++;
396 745264830 : }
397 4463394 : }
398 :
399 4500897 : if( FD_LIKELY( my_idx > fanout ) ) {
400 : /* I'm at the bottom of Turbine tree for this shred. Fill in all
401 : the destinations with NO_DEST. */
402 732081666 : for( ulong j=0UL; j<dest_cnt; j++ ) out[ j*out_stride + i ] = FD_SHRED_DEST_NO_DEST;
403 :
404 3631200 : fd_wsample_restore_all( sdest->staked );
405 3631200 : continue; /* Next shred */
406 3631200 : }
407 : /* If my index is | Send to indices
408 : ------------------------------------
409 : Leader (no idx) | 0 (just for reference)
410 : 0 | 1, 2, ..., F
411 : j in [1, F] | j + l*F for l in [1,F]
412 : [F+1, F^2+F] | Nobody
413 : [F^2+F+1, inf) | Not yet implemented in Agave code
414 : */
415 869697 : ulong last_dest_idx = fd_ulong_if( my_idx==0UL, fanout, my_idx+fanout*fanout ); /* inclusive */
416 869697 : ulong stride = fd_ulong_if( my_idx==0UL, 1UL, fanout );
417 :
418 869697 : last_dest_idx = fd_ulong_min( last_dest_idx, my_idx + stride*dest_cnt );
419 :
420 869697 : ulong cursor = my_idx+1UL;
421 869697 : ulong stored_cnt = 0UL;
422 :
423 869697 : if( FD_LIKELY( (last_dest_idx>=staked_shuffle_populated_cnt) & (staked_shuffle_populated_cnt<sdest->staked_cnt+1UL ) ) ) {
424 404337 : ulong adtl = fd_ulong_min( last_dest_idx+1UL, sdest->staked_cnt+1UL ) - staked_shuffle_populated_cnt;
425 :
426 404337 : fd_wsample_sample_and_remove_many( sdest->staked, staked_shuffle+staked_shuffle_populated_cnt, adtl );
427 404337 : staked_shuffle_populated_cnt += adtl;
428 404337 : }
429 :
430 55823223 : while( cursor<=fd_ulong_min( last_dest_idx, sdest->staked_cnt ) ) {
431 55052592 : ulong sample = staked_shuffle[ cursor ];
432 55052592 : if( FD_UNLIKELY( sample==FD_WSAMPLE_EMPTY ) ) break;
433 54955941 : if( FD_UNLIKELY( sample==FD_WSAMPLE_INDETERMINATE ) ) break;
434 :
435 54953526 : if( FD_UNLIKELY( cursor == my_idx + stride*(stored_cnt+1UL) ) ) {
436 3971526 : out[ stored_cnt*out_stride + i ] = (ushort)sample;
437 3971526 : stored_cnt++;
438 3971526 : }
439 54953526 : cursor++;
440 54953526 : }
441 : /* If we broke from the above loop because of indeterminate, then
442 : unstaked_cnt==0, so the next loop will also be a no-op, and we'll
443 : fill the remaining array with NO_DEST, as desired. */
444 :
445 : /* Next set of samples (if any) come from the unstaked portion. If I
446 : am not staked, then prepare_unstaked_sampling was already called
447 : earlier. */
448 869697 : if( FD_LIKELY( (cursor<=last_dest_idx) & !!i_am_staked ) ) prepare_unstaked_sampling( sdest, leader_idx );
449 11802912 : while( cursor<=last_dest_idx ) {
450 11050503 : ulong sample = sample_unstaked( sdest );
451 11050503 : if( FD_UNLIKELY( sample==FD_WSAMPLE_EMPTY ) ) break;
452 :
453 10933215 : if( FD_UNLIKELY( cursor == my_idx + stride*(stored_cnt+1UL) ) ) {
454 78399 : out[ stored_cnt*out_stride + i ] = (ushort)sample;
455 78399 : stored_cnt++;
456 78399 : }
457 10933215 : cursor++;
458 10933215 : }
459 869697 : max_dest_cnt = fd_ulong_max( max_dest_cnt, stored_cnt );
460 :
461 : /* The rest of my destinations are past the end of the tree */
462 27410088 : for( ulong j=stored_cnt; j<dest_cnt; j++ ) out[ j*out_stride + i ] = FD_SHRED_DEST_NO_DEST;
463 :
464 869697 : fd_wsample_restore_all( sdest->staked );
465 :
466 869697 : }
467 3750897 : fd_ulong_store_if( !!opt_max_dest_cnt, opt_max_dest_cnt, max_dest_cnt );
468 3750897 : return out;
469 3750897 : }
470 :
471 : fd_shred_dest_idx_t
472 : fd_shred_dest_pubkey_to_idx( fd_shred_dest_t * sdest,
473 4342197 : fd_pubkey_t const * pubkey ) {
474 4342197 : if( FD_UNLIKELY( !memcmp( pubkey, null_pubkey.uc, 32UL ) ) ) return FD_SHRED_DEST_NO_DEST;
475 :
476 4342197 : pubkey_to_idx_t default_res[ 1 ] = {{ .idx = FD_SHRED_DEST_NO_DEST }};
477 4342197 : pubkey_to_idx_t * query = pubkey_to_idx_query( sdest->pubkey_to_idx_map, *pubkey, default_res );
478 :
479 4342197 : return (fd_shred_dest_idx_t)query->idx;
480 4342197 : }
481 :
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