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plan9fox/sys/src/cmd/spin/pangen4.h
cinap_lenrek 28e9566dc5 spin: Update to most recent version. (thanks Ori_B) 
from Ori_B:

There were a small number of changes needed from the tarball
on spinroot.org:

  - The mkfile needed to be updated
  - Memory.h needed to not be included
  - It needed to invoke /bin/cpp instead of gcc -E
  - It depended on `yychar`, which our yacc doesn't
    provide.

I'm still figuring out how to use spin, but it seems to do
the right thing when testing a few of the examples:

	% cd $home/src/Spin/Examples/
	% spin -a peterson.pml
	% pcc pan.c -D_POSIX_SOURCE
	% ./6.out

	(Spin Version 6.4.7 -- 19 August 2017)
		+ Partial Order Reduction

	Full statespace search for:
		never claim         	- (none specified)
		assertion violations	+
		acceptance   cycles 	- (not selected)
		invalid end states	+

	State-vector 32 byte, depth reached 24, errors: 0
	40 states, stored
	27 states, matched
	67 transitions (= stored+matched)
		0 atomic steps
	hash conflicts:         0 (resolved)

	Stats on memory usage (in Megabytes):
	0.002	equivalent memory usage for states (stored*(State-vector + overhead))
	0.292	actual memory usage for states
	128.000	memory used for hash table (-w24)
	0.534	memory used for DFS stack (-m10000)
	128.730	total actual memory usage


	unreached in proctype user
		/tmp/Spin/Examples/peterson.pml:20, state 10, "-end-"
		(1 of 10 states)

	pan: elapsed time 1.25 seconds
	pan: rate        32 states/second
2017-11-22 21:09:31 +01:00

726 lines
18 KiB
C
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/***** spin: pangen4.h *****/
/*
* This file is part of the public release of Spin. It is subject to the
* terms in the LICENSE file that is included in this source directory.
* Tool documentation is available at http://spinroot.com
*
* The DFA code below was written by Anuj Puri and Gerard J. Holzmann in
* May 1997, and was inspired by earlier work on data compression using
* sharing tree data structures and graph-encoded sets by J-Ch. Gregoire
* (INRS Telecom, Quebec, Canada) and D.Zampunieris (Univ.Namur, Belgium)
* The splay routine code included here is based on the public domain
* version written by D. Sleator <sleator@cs.cmu.edu> in 1992.
*/
static const char *Dfa[] = {
"#ifdef MA",
#if 0
"/*",
"#include <stdio.h>",
"#define uchar unsigned char",
"*/",
"#define ulong unsigned long",
"#define ushort unsigned short",
"",
#endif
"#define TWIDTH 256",
"#define HASH(y,n) (n)*(((long)y))",
"#define INRANGE(e,h) ((h>=e->From && h<=e->To)||(e->s==1 && e->S==h))",
"",
"extern char *emalloc(unsigned long); /* imported routine */",
"extern void dfa_init(ushort); /* 4 exported routines */",
"extern int dfa_member(ulong);",
"extern int dfa_store(uchar *);",
"extern void dfa_stats(void);",
"",
"typedef struct Edge {",
" uchar From, To; /* max range 0..255 */",
" uchar s, S; /* if s=1, S is singleton */",
" struct Vertex *Dst;",
" struct Edge *Nxt;",
"} Edge;",
"",
"typedef struct Vertex {",
" ulong key, num; /* key for splay tree, nr incoming edges */",
" uchar from[2], to[2]; /* in-node predefined edge info */",
" struct Vertex *dst[2];/* most nodes have 2 or more edges */",
" struct Edge *Succ; /* in case there are more edges */",
" struct Vertex *lnk, *left, *right; /* splay tree plumbing */",
"} Vertex;",
"",
"static Edge *free_edges;",
"static Vertex *free_vertices;",
"static Vertex **layers; /* one splay tree of nodes per layer */",
"static Vertex **path; /* run of word in the DFA */",
"static Vertex *R, *F, *NF; /* Root, Final, Not-Final */",
"static uchar *word, *lastword;/* string, and last string inserted */",
"static int dfa_depth, iv=0, nv=0, pfrst=0, Tally;",
"",
"static void insert_it(Vertex *, int); /* splay-tree code */",
"static void delete_it(Vertex *, int);",
"static Vertex *find_it(Vertex *, Vertex *, uchar, int);",
"",
"static void",
"recyc_edges(Edge *e)",
"{",
" if (!e) return;",
" recyc_edges(e->Nxt);",
" e->Nxt = free_edges;",
" free_edges = e;",
"}",
"",
"static Edge *",
"new_edge(Vertex *dst)",
"{ Edge *e;",
"",
" if (free_edges)",
" { e = free_edges;",
" free_edges = e->Nxt;",
" e->From = e->To = e->s = e->S = 0;",
" e->Nxt = (Edge *) 0;",
" } else",
" e = (Edge *) emalloc(sizeof(Edge));",
" e->Dst = dst;",
"",
" return e;",
"}",
"",
"static void",
"recyc_vertex(Vertex *v)",
"{",
" recyc_edges(v->Succ);",
" v->Succ = (Edge *) free_vertices;",
" free_vertices = v;",
" nr_states--;",
"}",
"",
"static Vertex *",
"new_vertex(void)",
"{ Vertex *v;",
"",
" if (free_vertices)",
" { v = free_vertices;",
" free_vertices = (Vertex *) v->Succ;",
" v->Succ = (Edge *) 0;",
" v->num = 0;",
" } else",
" v = (Vertex *) emalloc(sizeof(Vertex));",
"",
" nr_states++;",
" return v; ",
"}",
"",
"static Vertex *",
"allDelta(Vertex *v, int n)",
"{ Vertex *dst = new_vertex();",
"",
" v->from[0] = 0;",
" v->to[0] = 255;",
" v->dst[0] = dst;",
" dst->num = 256;",
" insert_it(v, n);",
" return dst;",
"}",
"",
"static void",
"insert_edge(Vertex *v, Edge *e)",
"{ /* put new edge first */",
" if (!v->dst[0])",
" { v->dst[0] = e->Dst;",
" v->from[0] = e->From;",
" v->to[0] = e->To;",
" recyc_edges(e);",
" return;",
" }",
" if (!v->dst[1])",
" { v->from[1] = v->from[0]; v->from[0] = e->From;",
" v->to[1] = v->to[0]; v->to[0] = e->To;",
" v->dst[1] = v->dst[0]; v->dst[0] = e->Dst;",
" recyc_edges(e);",
" return;",
" } /* shift */",
" { int f = v->from[1];",
" int t = v->to[1];",
" Vertex *d = v->dst[1];",
" v->from[1] = v->from[0]; v->from[0] = e->From;",
" v->to[1] = v->to[0]; v->to[0] = e->To;",
" v->dst[1] = v->dst[0]; v->dst[0] = e->Dst;",
" e->From = f;",
" e->To = t;",
" e->Dst = d;",
" }",
" e->Nxt = v->Succ;",
" v->Succ = e;",
"}",
"",
"static void",
"copyRecursive(Vertex *v, Edge *e)",
"{ Edge *f;",
" if (e->Nxt) copyRecursive(v, e->Nxt);",
" f = new_edge(e->Dst);",
" f->From = e->From;",
" f->To = e->To;",
" f->s = e->s;",
" f->S = e->S;",
" f->Nxt = v->Succ;",
" v->Succ = f;",
"}",
"",
"static void",
"copyEdges(Vertex *to, Vertex *from)",
"{ int i;",
" for (i = 0; i < 2; i++)",
" { to->from[i] = from->from[i];",
" to->to[i] = from->to[i];",
" to->dst[i] = from->dst[i];",
" }",
" if (from->Succ) copyRecursive(to, from->Succ);",
"}",
"",
"static Edge *",
"cacheDelta(Vertex *v, int h, int first)",
"{ static Edge *ov, tmp; int i;",
"",
" if (!first && INRANGE(ov,h))",
" return ov; /* intercepts about 10%% */",
" for (i = 0; i < 2; i++)",
" if (v->dst[i] && h >= v->from[i] && h <= v->to[i])",
" { tmp.From = v->from[i];",
" tmp.To = v->to[i];",
" tmp.Dst = v->dst[i];",
" tmp.s = tmp.S = 0;",
" ov = &tmp;",
" return ov;",
" }",
" for (ov = v->Succ; ov; ov = ov->Nxt)",
" if (INRANGE(ov,h)) return ov;",
"",
" Uerror(\"cannot get here, cacheDelta\");",
" return (Edge *) 0;",
"}",
"",
"static Vertex *",
"Delta(Vertex *v, int h) /* v->delta[h] */",
"{ Edge *e;",
"",
" if (v->dst[0] && h >= v->from[0] && h <= v->to[0])",
" return v->dst[0]; /* oldest edge */",
" if (v->dst[1] && h >= v->from[1] && h <= v->to[1])",
" return v->dst[1];",
" for (e = v->Succ; e; e = e->Nxt)",
" if (INRANGE(e,h))",
" return e->Dst;",
" Uerror(\"cannot happen Delta\");",
" return (Vertex *) 0;",
"}",
"",
"static void",
"numDelta(Vertex *v, int d)",
"{ Edge *e;",
" ulong cnt;",
" int i;",
"",
" for (i = 0; i < 2; i++)",
" if (v->dst[i])",
" { cnt = v->dst[i]->num + d*(1 + v->to[i] - v->from[i]);",
" if (d == 1 && cnt < v->dst[i]->num) goto bad;",
" v->dst[i]->num = cnt;",
" }",
" for (e = v->Succ; e; e = e->Nxt)",
" { cnt = e->Dst->num + d*(1 + e->To - e->From + e->s);",
" if (d == 1 && cnt < e->Dst->num)",
"bad: Uerror(\"too many incoming edges\");",
" e->Dst->num = cnt;",
" }",
"}",
"",
"static void",
"setDelta(Vertex *v, int h, Vertex *newdst) /* v->delta[h] = newdst; */",
"{ Edge *e, *f = (Edge *) 0, *g;",
" int i;",
"",
" /* remove the old entry, if there */",
" for (i = 0; i < 2; i++)",
" if (v->dst[i] && h >= v->from[i] && h <= v->to[i])",
" { if (h == v->from[i])",
" { if (h == v->to[i])",
" { v->dst[i] = (Vertex *) 0;",
" v->from[i] = v->to[i] = 0;",
" } else",
" v->from[i]++;",
" } else if (h == v->to[i])",
" { v->to[i]--;",
" } else",
" { g = new_edge(v->dst[i]);/* same dst */",
" g->From = v->from[i];",
" g->To = h-1; /* left half */",
" v->from[i] = h+1; /* right half */",
" insert_edge(v, g);",
" }",
" goto part2;",
" }",
" for (e = v->Succ; e; f = e, e = e->Nxt)",
" { if (e->s == 1 && e->S == h)",
" { e->s = e->S = 0;",
" goto rem_tst;",
" }",
" if (h >= e->From && h <= e->To)",
" { if (h == e->From)",
" { if (h == e->To)",
" { if (e->s)",
" { e->From = e->To = e->S;",
" e->s = 0;",
" break;",
" } else",
" goto rem_do;",
" } else",
" e->From++;",
" } else if (h == e->To)",
" { e->To--;",
" } else /* split */",
" { g = new_edge(e->Dst); /* same dst */",
" g->From = e->From;",
" g->To = h-1; /* g=left half */",
" e->From = h+1; /* e=right half */",
" g->Nxt = e->Nxt; /* insert g */",
" e->Nxt = g; /* behind e */",
" break; /* done */",
" }",
"",
"rem_tst: if (e->From > e->To)",
" { if (e->s == 0) {",
"rem_do: if (f)",
" f->Nxt = e->Nxt;",
" else",
" v->Succ = e->Nxt;",
" e->Nxt = (Edge *) 0;",
" recyc_edges(e);",
" } else",
" { e->From = e->To = e->S;",
" e->s = 0;",
" } }",
" break;",
" } }",
"part2:",
" /* check if newdst is already there */",
" for (i = 0; i < 2; i++)",
" if (v->dst[i] == newdst)",
" { if (h+1 == (int) v->from[i])",
" { v->from[i] = h;",
" return;",
" }",
" if (h == (int) v->to[i]+1)",
" { v->to[i] = h;",
" return;",
" } }",
" for (e = v->Succ; e; e = e->Nxt)",
" { if (e->Dst == newdst)",
" { if (h+1 == (int) e->From)",
" { e->From = h;",
" if (e->s == 1 && e->S+1 == e->From)",
" { e->From = e->S;",
" e->s = e->S = 0;",
" }",
" return;",
" }",
" if (h == (int) e->To+1)",
" { e->To = h;",
" if (e->s == 1 && e->S == e->To+1)",
" { e->To = e->S;",
" e->s = e->S = 0;",
" }",
" return;",
" }",
" if (e->s == 0)",
" { e->s = 1;",
" e->S = h;",
" return;",
" } } }",
" /* add as a new edge */",
" e = new_edge(newdst);",
" e->From = e->To = h;",
" insert_edge(v, e);",
"}",
"",
"static ulong",
"cheap_key(Vertex *v)",
"{ ulong vk2 = 0;",
"",
" if (v->dst[0])",
" { vk2 = (ulong) v->dst[0];",
" if ((ulong) v->dst[1] > vk2)",
" vk2 = (ulong) v->dst[1];",
" } else if (v->dst[1])",
" vk2 = (ulong) v->dst[1]; ",
" if (v->Succ)",
" { Edge *e;",
" for (e = v->Succ; e; e = e->Nxt)",
" if ((ulong) e->Dst > vk2)",
" vk2 = (ulong) e->Dst;",
" }",
" Tally = (vk2>>2)&(TWIDTH-1);",
" return v->key;",
"}",
"",
"static ulong",
"mk_key(Vertex *v) /* not sensitive to order */",
"{ ulong m = 0, vk2 = 0;",
" Edge *e;",
"",
" if (v->dst[0])",
" { m += HASH(v->dst[0], v->to[0] - v->from[0] + 1);",
" vk2 = (ulong) v->dst[0]; ",
" }",
" if (v->dst[1])",
" { m += HASH(v->dst[1], v->to[1] - v->from[1] + 1);",
" if ((ulong) v->dst[1] > vk2) vk2 = (ulong) v->dst[1]; ",
" }",
" for (e = v->Succ; e; e = e->Nxt)",
" { m += HASH(e->Dst, e->To - e->From + 1 + e->s);",
" if ((ulong) e->Dst > vk2) vk2 = (ulong) e->Dst; ",
" }",
" Tally = (vk2>>2)&(TWIDTH-1);",
" return m;",
"}",
"",
"static ulong",
"mk_special(int sigma, Vertex *n, Vertex *v)",
"{ ulong m = 0, vk2 = 0;",
" Edge *f;",
" int i;",
"",
" for (i = 0; i < 2; i++)",
" if (v->dst[i])",
" { if (sigma >= v->from[i] && sigma <= v->to[i])",
" { m += HASH(v->dst[i], v->to[i]-v->from[i]);",
" if ((ulong) v->dst[i] > vk2",
" && v->to[i] > v->from[i])",
" vk2 = (ulong) v->dst[i]; ",
" } else",
" { m += HASH(v->dst[i], v->to[i]-v->from[i]+1);",
" if ((ulong) v->dst[i] > vk2)",
" vk2 = (ulong) v->dst[i]; ",
" } }",
" for (f = v->Succ; f; f = f->Nxt)",
" { if (sigma >= f->From && sigma <= f->To)",
" { m += HASH(f->Dst, f->To - f->From + f->s);",
" if ((ulong) f->Dst > vk2",
" && f->To - f->From + f->s > 0)",
" vk2 = (ulong) f->Dst; ",
" } else if (f->s == 1 && sigma == f->S)",
" { m += HASH(f->Dst, f->To - f->From + 1);",
" if ((ulong) f->Dst > vk2) vk2 = (ulong) f->Dst; ",
" } else",
" { m += HASH(f->Dst, f->To - f->From + 1 + f->s);",
" if ((ulong) f->Dst > vk2) vk2 = (ulong) f->Dst; ",
" } }",
"",
" if ((ulong) n > vk2) vk2 = (ulong) n; ",
" Tally = (vk2>>2)&(TWIDTH-1);",
" m += HASH(n, 1);",
" return m;",
"}",
"",
"void ",
"dfa_init(ushort nr_layers)",
"{ int i; Vertex *r, *t;",
"",
" dfa_depth = nr_layers; /* one byte per layer */",
" path = (Vertex **) emalloc((dfa_depth+1)*sizeof(Vertex *));",
" layers = (Vertex **) emalloc(TWIDTH*(dfa_depth+1)*sizeof(Vertex *));",
" lastword = (uchar *) emalloc((dfa_depth+1)*sizeof(uchar));",
" lastword[dfa_depth] = lastword[0] = 255;",
" path[0] = R = new_vertex(); F = new_vertex();",
"",
" for (i = 1, r = R; i < dfa_depth; i++, r = t)",
" t = allDelta(r, i-1);",
" NF = allDelta(r, i-1);",
"}",
"",
"#if 0",
"static void complement_dfa(void) { Vertex *tmp = F; F = NF; NF = tmp; }",
"#endif",
"",
"double",
"tree_stats(Vertex *t)",
"{ Edge *e; double cnt=0.0;",
" if (!t) return 0;",
" if (!t->key) return 0;",
" t->key = 0; /* precaution */",
" if (t->dst[0]) cnt++;",
" if (t->dst[1]) cnt++;",
" for (e = t->Succ; e; e = e->Nxt)",
" cnt++;",
" cnt += tree_stats(t->lnk);",
" cnt += tree_stats(t->left);",
" cnt += tree_stats(t->right);",
" return cnt;",
"}",
"",
"void",
"dfa_stats(void)",
"{ int i, j; double cnt = 0.0;",
" for (j = 0; j < TWIDTH; j++)",
" for (i = 0; i < dfa_depth+1; i++)",
" cnt += tree_stats(layers[i*TWIDTH+j]);",
" printf(\"Minimized Automaton:\t%%6lu nodes and %%6g edges\\n\",",
" nr_states, cnt);",
"}",
"",
"int",
"dfa_member(ulong n)",
"{ Vertex **p, **q;",
" uchar *w = &word[n];",
" int i;",
"",
" p = &path[n]; q = (p+1);",
" for (i = n; i < dfa_depth; i++)",
" *q++ = Delta(*p++, *w++);",
" return (*p == F);",
"}",
"",
"int",
"dfa_store(uchar *sv)",
"{ Vertex **p, **q, *s, *y, *old, *new = F;",
" uchar *w, *u = lastword;",
" int i, j, k;",
"",
" w = word = sv;",
" while (*w++ == *u++) /* find first byte that differs */",
" ;",
" pfrst = (int) (u - lastword) - 1;",
" memcpy(&lastword[pfrst], &sv[pfrst], dfa_depth-pfrst);",
" if (pfrst > iv) pfrst = iv;",
" if (pfrst > nv) pfrst = nv;",
"/* phase1: */",
" p = &path[pfrst]; q = (p+1); w = &word[pfrst];",
" for (i = pfrst; i < dfa_depth; i++)",
" *q++ = Delta(*p++, *w++); /* (*p)->delta[*w++]; */",
"",
" if (*p == F) return 1; /* it's already there */",
"/* phase2: */",
" iv = dfa_depth;",
" do { iv--;",
" old = new;",
" new = find_it(path[iv], old, word[iv], iv);",
" } while (new && iv > 0);",
"",
"/* phase3: */",
" nv = k = 0; s = path[0];",
" for (j = 1; j <= iv; ++j) ",
" if (path[j]->num > 1)",
" { y = new_vertex();",
" copyEdges(y, path[j]);",
" insert_it(y, j);",
" numDelta(y, 1);",
" delete_it(s, j-1);",
" setDelta(s, word[j-1], y);",
" insert_it(s, j-1);",
" y->num = 1; /* initial value 1 */",
" s = y;",
" path[j]->num--; /* only 1 moved from j to y */",
" k = 1;",
" } else",
" { s = path[j];",
" if (!k) nv = j;",
" }",
" y = Delta(s, word[iv]);",
" y->num--;",
" delete_it(s, iv); ",
" setDelta(s, word[iv], old);",
" insert_it(s, iv); ",
" old->num++;",
"",
" for (j = iv+1; j < dfa_depth; j++)",
" if (path[j]->num == 0)",
" { numDelta(path[j], -1);",
" delete_it(path[j], j);",
" recyc_vertex(path[j]);",
" } else",
" break;",
" return 0;",
"}",
"",
"static Vertex *",
"splay(ulong i, Vertex *t)",
"{ Vertex N, *l, *r, *y;",
"",
" if (!t) return t;",
" N.left = N.right = (Vertex *) 0;",
" l = r = &N;",
" for (;;)",
" { if (i < t->key)",
" { if (!t->left) break;",
" if (i < t->left->key)",
" { y = t->left;",
" t->left = y->right;",
" y->right = t;",
" t = y;",
" if (!t->left) break;",
" }",
" r->left = t;",
" r = t;",
" t = t->left;",
" } else if (i > t->key)",
" { if (!t->right) break;",
" if (i > t->right->key)",
" { y = t->right;",
" t->right = y->left;",
" y->left = t;",
" t = y;",
" if (!t->right) break;",
" }",
" l->right = t;",
" l = t;",
" t = t->right;",
" } else",
" break;",
" }",
" l->right = t->left;",
" r->left = t->right;",
" t->left = N.right;",
" t->right = N.left;",
" return t;",
"}",
"",
"static void",
"insert_it(Vertex *v, int L)",
"{ Vertex *new, *t;",
" ulong i; int nr;",
"",
" i = mk_key(v);",
" nr = ((L*TWIDTH)+Tally);",
" t = layers[nr];",
"",
" v->key = i; ",
" if (!t)",
" { layers[nr] = v;",
" return;",
" }",
" t = splay(i, t);",
" if (i < t->key)",
" { new = v;",
" new->left = t->left;",
" new->right = t;",
" t->left = (Vertex *) 0;",
" } else if (i > t->key)",
" { new = v;",
" new->right = t->right;",
" new->left = t;",
" t->right = (Vertex *) 0;",
" } else /* it's already there */",
" { v->lnk = t->lnk; /* put in linked list off v */",
" t->lnk = v;",
" new = t;",
" }",
" layers[nr] = new;",
"}",
"",
"static int",
"checkit(Vertex *h, Vertex *v, Vertex *n, uchar sigma)",
"{ Edge *g, *f;",
" int i, k, j = 1;",
"",
" for (k = 0; k < 2; k++)",
" if (h->dst[k])",
" { if (sigma >= h->from[k] && sigma <= h->to[k])",
" { if (h->dst[k] != n) goto no_match;",
" }",
" for (i = h->from[k]; i <= h->to[k]; i++)",
" { if (i == sigma) continue;",
" g = cacheDelta(v, i, j); j = 0;",
" if (h->dst[k] != g->Dst)",
" goto no_match;",
" if (g->s == 0 || g->S != i)",
" i = g->To;",
" } }",
" for (f = h->Succ; f; f = f->Nxt)",
" { if (INRANGE(f,sigma))",
" { if (f->Dst != n) goto no_match;",
" }",
" for (i = f->From; i <= f->To; i++)",
" { if (i == sigma) continue;",
" g = cacheDelta(v, i, j); j = 0;",
" if (f->Dst != g->Dst)",
" goto no_match;",
" if (g->s == 1 && i == g->S)",
" continue;",
" i = g->To;",
" }",
" if (f->s && f->S != sigma)",
" { g = cacheDelta(v, f->S, 1);",
" if (f->Dst != g->Dst)",
" goto no_match;",
" }",
" }",
" if (h->Succ || h->dst[0] || h->dst[1]) return 1;",
"no_match:",
" return 0;",
"}",
"",
"static Vertex *",
"find_it(Vertex *v, Vertex *n, uchar sigma, int L)",
"{ Vertex *z, *t;",
" ulong i; int nr;",
"",
" i = mk_special(sigma,n,v);",
" nr = ((L*TWIDTH)+Tally);",
" t = layers[nr];",
"",
" if (!t) return (Vertex *) 0;",
" layers[nr] = t = splay(i, t);",
" if (i == t->key)",
" for (z = t; z; z = z->lnk)",
" if (checkit(z, v, n, sigma))",
" return z;",
"",
" return (Vertex *) 0;",
"}",
"",
"static void",
"delete_it(Vertex *v, int L)",
"{ Vertex *x, *t;",
" ulong i; int nr;",
"",
" i = cheap_key(v);",
" nr = ((L*TWIDTH)+Tally);",
" t = layers[nr];",
" if (!t) return;",
"",
" t = splay(i, t);",
" if (i == t->key)",
" { Vertex *z, *y = (Vertex *) 0;",
" for (z = t; z && z != v; y = z, z = z->lnk)",
" ;",
" if (z != v) goto bad;",
" if (y)",
" { y->lnk = z->lnk;",
" z->lnk = (Vertex *) 0;",
" layers[nr] = t;",
" return;",
" } else if (z->lnk) /* z == t == v */",
" { y = z->lnk;",
" y->left = t->left;",
" y->right = t->right;",
" t->left = t->right = t->lnk = (Vertex *) 0;",
" layers[nr] = y;",
" return;",
" }",
" /* delete the node itself */",
" if (!t->left)",
" { x = t->right;",
" } else",
" { x = splay(i, t->left);",
" x->right = t->right;",
" }",
" t->left = t->right = t->lnk = (Vertex *) 0;",
" layers[nr] = x;",
" return;",
" }",
"bad: Uerror(\"cannot happen delete\");",
"}",
"#endif", /* MA */
0,
};
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