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authorSlackerLinux85 <SlackerLinux85@55599770-6f59-11de-83c4-53937bf5378e>2017-04-13 11:30:00 +0000
committer/dev/humancontroller <devhc@example.com>2017-04-15 12:04:45 +0200
commit45973dc48641365b31475733bce7af9c3b8603a6 (patch)
treec9e4cdec39e41fe35c3f0ec96d4d9bda70d682d7 /src/tools/lcc/lburg/lburg.c
parent4d5120be9583309471102f8944234ee8a3a5738e (diff)
import the Slacker's QVM code base
Diffstat (limited to 'src/tools/lcc/lburg/lburg.c')
-rw-r--r--src/tools/lcc/lburg/lburg.c671
1 files changed, 671 insertions, 0 deletions
diff --git a/src/tools/lcc/lburg/lburg.c b/src/tools/lcc/lburg/lburg.c
new file mode 100644
index 0000000..c43c96a
--- /dev/null
+++ b/src/tools/lcc/lburg/lburg.c
@@ -0,0 +1,671 @@
+#include <assert.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include "lburg.h"
+
+static char rcsid[] = "lburg.c - faked rcsid";
+
+static char *prefix = "";
+static int Tflag = 0;
+static int ntnumber = 0;
+static Nonterm start = 0;
+static Term terms;
+static Nonterm nts;
+static Rule rules;
+static int nrules;
+static struct block {
+ struct block *link;
+} *memlist; /* list of allocated blocks */
+
+static char *stringf(char *fmt, ...);
+static void print(char *fmt, ...);
+static void ckreach(Nonterm p);
+static void emitclosure(Nonterm nts);
+static void emitcost(Tree t, char *v);
+static void emitdefs(Nonterm nts, int ntnumber);
+static void emitheader(void);
+static void emitkids(Rule rules, int nrules);
+static void emitnts(Rule rules, int nrules);
+static void emitrecalc(char *pre, Term root, Term kid);
+static void emitrecord(char *pre, Rule r, char *c, int cost);
+static void emitrule(Nonterm nts);
+static void emitlabel(Term terms, Nonterm start, int ntnumber);
+static void emitstring(Rule rules);
+static void emitstruct(Nonterm nts, int ntnumber);
+static void emittest(Tree t, char *v, char *suffix);
+
+int main(int argc, char *argv[]) {
+ int c, i;
+ Nonterm p;
+
+ for (i = 1; i < argc; i++)
+ if (strcmp(argv[i], "-T") == 0)
+ Tflag = 1;
+ else if (strncmp(argv[i], "-p", 2) == 0 && argv[i][2])
+ prefix = &argv[i][2];
+ else if (strncmp(argv[i], "-p", 2) == 0 && i + 1 < argc)
+ prefix = argv[++i];
+ else if (*argv[i] == '-' && argv[i][1]) {
+ yyerror("usage: %s [-T | -p prefix]... [ [ input ] output ] \n",
+ argv[0]);
+ exit(1);
+ } else if (infp == NULL) {
+ if (strcmp(argv[i], "-") == 0)
+ infp = stdin;
+ else if ((infp = fopen(argv[i], "r")) == NULL) {
+ yyerror("%s: can't read `%s'\n", argv[0], argv[i]);
+ exit(1);
+ }
+ } else if (outfp == NULL) {
+ if (strcmp(argv[i], "-") == 0)
+ outfp = stdout;
+ if ((outfp = fopen(argv[i], "w")) == NULL) {
+ yyerror("%s: can't write `%s'\n", argv[0], argv[i]);
+ exit(1);
+ }
+ }
+ if (infp == NULL)
+ infp = stdin;
+ if (outfp == NULL)
+ outfp = stdout;
+ yyparse();
+ if (start)
+ ckreach(start);
+ for (p = nts; p; p = p->link) {
+ if (p->rules == NULL)
+ yyerror("undefined nonterminal `%s'\n", p->name);
+ if (!p->reached)
+ yyerror("can't reach nonterminal `%s'\n", p->name);
+ }
+ emitheader();
+ emitdefs(nts, ntnumber);
+ emitstruct(nts, ntnumber);
+ emitnts(rules, nrules);
+ emitstring(rules);
+ emitrule(nts);
+ emitclosure(nts);
+ if (start)
+ emitlabel(terms, start, ntnumber);
+ emitkids(rules, nrules);
+ if (!feof(infp))
+ while ((c = getc(infp)) != EOF)
+ putc(c, outfp);
+ while (memlist) { /* for purify */
+ struct block *q = memlist->link;
+ free(memlist);
+ memlist = q;
+ }
+ return errcnt > 0;
+}
+
+/* alloc - allocate nbytes or issue fatal error */
+void *alloc(int nbytes) {
+ struct block *p = calloc(1, sizeof *p + nbytes);
+
+ if (p == NULL) {
+ yyerror("out of memory\n");
+ exit(1);
+ }
+ p->link = memlist;
+ memlist = p;
+ return p + 1;
+}
+
+/* stringf - format and save a string */
+static char *stringf(char *fmt, ...) {
+ va_list ap;
+ char buf[512];
+
+ va_start(ap, fmt);
+ vsprintf(buf, fmt, ap);
+ va_end(ap);
+ return strcpy(alloc(strlen(buf) + 1), buf);
+}
+
+struct entry {
+ union {
+ char *name;
+ struct term t;
+ struct nonterm nt;
+ } sym;
+ struct entry *link;
+} *table[211];
+#define HASHSIZE (sizeof table/sizeof table[0])
+
+/* hash - return hash number for str */
+static unsigned hash(char *str) {
+ unsigned h = 0;
+
+ while (*str)
+ h = (h<<1) + *str++;
+ return h;
+}
+
+/* lookup - lookup symbol name */
+static void *lookup(char *name) {
+ struct entry *p = table[hash(name)%HASHSIZE];
+
+ for ( ; p; p = p->link)
+ if (strcmp(name, p->sym.name) == 0)
+ return &p->sym;
+ return 0;
+}
+
+/* install - install symbol name */
+static void *install(char *name) {
+ struct entry *p = alloc(sizeof *p);
+ int i = hash(name)%HASHSIZE;
+
+ p->sym.name = name;
+ p->link = table[i];
+ table[i] = p;
+ return &p->sym;
+}
+
+/* nonterm - create a new terminal id, if necessary */
+Nonterm nonterm(char *id) {
+ Nonterm p = lookup(id), *q = &nts;
+
+ if (p && p->kind == NONTERM)
+ return p;
+ if (p && p->kind == TERM)
+ yyerror("`%s' is a terminal\n", id);
+ p = install(id);
+ p->kind = NONTERM;
+ p->number = ++ntnumber;
+ if (p->number == 1)
+ start = p;
+ while (*q && (*q)->number < p->number)
+ q = &(*q)->link;
+ assert(*q == 0 || (*q)->number != p->number);
+ p->link = *q;
+ *q = p;
+ return p;
+}
+
+/* term - create a new terminal id with external symbol number esn */
+Term term(char *id, int esn) {
+ Term p = lookup(id), *q = &terms;
+
+ if (p)
+ yyerror("redefinition of terminal `%s'\n", id);
+ else
+ p = install(id);
+ p->kind = TERM;
+ p->esn = esn;
+ p->arity = -1;
+ while (*q && (*q)->esn < p->esn)
+ q = &(*q)->link;
+ if (*q && (*q)->esn == p->esn)
+ yyerror("duplicate external symbol number `%s=%d'\n",
+ p->name, p->esn);
+ p->link = *q;
+ *q = p;
+ return p;
+}
+
+/* tree - create & initialize a tree node with the given fields */
+Tree tree(char *id, Tree left, Tree right) {
+ Tree t = alloc(sizeof *t);
+ Term p = lookup(id);
+ int arity = 0;
+
+ if (left && right)
+ arity = 2;
+ else if (left)
+ arity = 1;
+ if (p == NULL && arity > 0) {
+ yyerror("undefined terminal `%s'\n", id);
+ p = term(id, -1);
+ } else if (p == NULL && arity == 0)
+ p = (Term)nonterm(id);
+ else if (p && p->kind == NONTERM && arity > 0) {
+ yyerror("`%s' is a nonterminal\n", id);
+ p = term(id, -1);
+ }
+ if (p->kind == TERM && p->arity == -1)
+ p->arity = arity;
+ if (p->kind == TERM && arity != p->arity)
+ yyerror("inconsistent arity for terminal `%s'\n", id);
+ t->op = p;
+ t->nterms = p->kind == TERM;
+ if ((t->left = left) != NULL)
+ t->nterms += left->nterms;
+ if ((t->right = right) != NULL)
+ t->nterms += right->nterms;
+ return t;
+}
+
+/* rule - create & initialize a rule with the given fields */
+Rule rule(char *id, Tree pattern, char *template, char *code) {
+ Rule r = alloc(sizeof *r), *q;
+ Term p = pattern->op;
+ char *end;
+
+ r->lhs = nonterm(id);
+ r->packed = ++r->lhs->lhscount;
+ for (q = &r->lhs->rules; *q; q = &(*q)->decode)
+ ;
+ *q = r;
+ r->pattern = pattern;
+ r->ern = ++nrules;
+ r->template = template;
+ r->code = code;
+ r->cost = strtol(code, &end, 10);
+ if (*end) {
+ r->cost = -1;
+ r->code = stringf("(%s)", code);
+ }
+ if (p->kind == TERM) {
+ for (q = &p->rules; *q; q = &(*q)->next)
+ ;
+ *q = r;
+ } else if (pattern->left == NULL && pattern->right == NULL) {
+ Nonterm p = pattern->op;
+ r->chain = p->chain;
+ p->chain = r;
+ if (r->cost == -1)
+ yyerror("illegal nonconstant cost `%s'\n", code);
+ }
+ for (q = &rules; *q; q = &(*q)->link)
+ ;
+ r->link = *q;
+ *q = r;
+ return r;
+}
+
+/* print - formatted output */
+static void print(char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ for ( ; *fmt; fmt++)
+ if (*fmt == '%')
+ switch (*++fmt) {
+ case 'd': fprintf(outfp, "%d", va_arg(ap, int)); break;
+ case 's': fputs(va_arg(ap, char *), outfp); break;
+ case 'P': fprintf(outfp, "%s_", prefix); break;
+ case 'T': {
+ Tree t = va_arg(ap, Tree);
+ print("%S", t->op);
+ if (t->left && t->right)
+ print("(%T,%T)", t->left, t->right);
+ else if (t->left)
+ print("(%T)", t->left);
+ break;
+ }
+ case 'R': {
+ Rule r = va_arg(ap, Rule);
+ print("%S: %T", r->lhs, r->pattern);
+ break;
+ }
+ case 'S': fputs(va_arg(ap, Term)->name, outfp); break;
+ case '1': case '2': case '3': case '4': case '5': {
+ int n = *fmt - '0';
+ while (n-- > 0)
+ putc('\t', outfp);
+ break;
+ }
+ default: putc(*fmt, outfp); break;
+ }
+ else
+ putc(*fmt, outfp);
+ va_end(ap);
+}
+
+/* reach - mark all nonterminals in tree t as reachable */
+static void reach(Tree t) {
+ Nonterm p = t->op;
+
+ if (p->kind == NONTERM)
+ if (!p->reached)
+ ckreach(p);
+ if (t->left)
+ reach(t->left);
+ if (t->right)
+ reach(t->right);
+}
+
+/* ckreach - mark all nonterminals reachable from p */
+static void ckreach(Nonterm p) {
+ Rule r;
+
+ p->reached = 1;
+ for (r = p->rules; r; r = r->decode)
+ reach(r->pattern);
+}
+
+/* emitcase - emit one case in function state */
+static void emitcase(Term p, int ntnumber) {
+ Rule r;
+
+ print("%1case %d: /* %S */\n", p->esn, p);
+ switch (p->arity) {
+ case 0: case -1:
+ break;
+ case 1:
+ print("%2%Plabel(LEFT_CHILD(a));\n");
+ break;
+ case 2:
+ print("%2%Plabel(LEFT_CHILD(a));\n");
+ print("%2%Plabel(RIGHT_CHILD(a));\n");
+ break;
+ default: assert(0);
+ }
+ for (r = p->rules; r; r = r->next) {
+ char *indent = "\t\t\0";
+ switch (p->arity) {
+ case 0: case -1:
+ print("%2/* %R */\n", r);
+ if (r->cost == -1) {
+ print("%2c = %s;\n", r->code);
+ emitrecord("\t\t", r, "c", 0);
+ } else
+ emitrecord("\t\t", r, r->code, 0);
+ break;
+ case 1:
+ if (r->pattern->nterms > 1) {
+ print("%2if (%1/* %R */\n", r);
+ emittest(r->pattern->left, "LEFT_CHILD(a)", " ");
+ print("%2) {\n");
+ indent = "\t\t\t";
+ } else
+ print("%2/* %R */\n", r);
+ if (r->pattern->nterms == 2 && r->pattern->left
+ && r->pattern->right == NULL)
+ emitrecalc(indent, r->pattern->op, r->pattern->left->op);
+ print("%sc = ", indent);
+ emitcost(r->pattern->left, "LEFT_CHILD(a)");
+ print("%s;\n", r->code);
+ emitrecord(indent, r, "c", 0);
+ if (indent[2])
+ print("%2}\n");
+ break;
+ case 2:
+ if (r->pattern->nterms > 1) {
+ print("%2if (%1/* %R */\n", r);
+ emittest(r->pattern->left, "LEFT_CHILD(a)",
+ r->pattern->right->nterms ? " && " : " ");
+ emittest(r->pattern->right, "RIGHT_CHILD(a)", " ");
+ print("%2) {\n");
+ indent = "\t\t\t";
+ } else
+ print("%2/* %R */\n", r);
+ print("%sc = ", indent);
+ emitcost(r->pattern->left, "LEFT_CHILD(a)");
+ emitcost(r->pattern->right, "RIGHT_CHILD(a)");
+ print("%s;\n", r->code);
+ emitrecord(indent, r, "c", 0);
+ if (indent[2])
+ print("%2}\n");
+ break;
+ default: assert(0);
+ }
+ }
+ print("%2break;\n");
+}
+
+/* emitclosure - emit the closure functions */
+static void emitclosure(Nonterm nts) {
+ Nonterm p;
+
+ for (p = nts; p; p = p->link)
+ if (p->chain)
+ print("static void %Pclosure_%S(NODEPTR_TYPE, int);\n", p);
+ print("\n");
+ for (p = nts; p; p = p->link)
+ if (p->chain) {
+ Rule r;
+ print("static void %Pclosure_%S(NODEPTR_TYPE a, int c) {\n"
+"%1struct %Pstate *p = STATE_LABEL(a);\n", p);
+ for (r = p->chain; r; r = r->chain)
+ emitrecord("\t", r, "c", r->cost);
+ print("}\n\n");
+ }
+}
+
+/* emitcost - emit cost computation for tree t */
+static void emitcost(Tree t, char *v) {
+ Nonterm p = t->op;
+
+ if (p->kind == TERM) {
+ if (t->left)
+ emitcost(t->left, stringf("LEFT_CHILD(%s)", v));
+ if (t->right)
+ emitcost(t->right, stringf("RIGHT_CHILD(%s)", v));
+ } else
+ print("((struct %Pstate *)(%s->x.state))->cost[%P%S_NT] + ", v, p);
+}
+
+/* emitdefs - emit nonterminal defines and data structures */
+static void emitdefs(Nonterm nts, int ntnumber) {
+ Nonterm p;
+
+ for (p = nts; p; p = p->link)
+ print("#define %P%S_NT %d\n", p, p->number);
+ print("\n");
+ print("static char *%Pntname[] = {\n%10,\n");
+ for (p = nts; p; p = p->link)
+ print("%1\"%S\",\n", p);
+ print("%10\n};\n\n");
+}
+
+/* emitheader - emit initial definitions */
+static void emitheader(void) {
+ time_t timer = time(NULL);
+
+ print("/*\ngenerated at %sby %s\n*/\n", ctime(&timer), rcsid);
+ print("static void %Pkids(NODEPTR_TYPE, int, NODEPTR_TYPE[]);\n");
+ print("static void %Plabel(NODEPTR_TYPE);\n");
+ print("static int %Prule(void*, int);\n\n");
+}
+
+/* computekids - compute paths to kids in tree t */
+static char *computekids(Tree t, char *v, char *bp, int *ip) {
+ Term p = t->op;
+
+ if (p->kind == NONTERM) {
+ sprintf(bp, "\t\tkids[%d] = %s;\n", (*ip)++, v);
+ bp += strlen(bp);
+ } else if (p->arity > 0) {
+ bp = computekids(t->left, stringf("LEFT_CHILD(%s)", v), bp, ip);
+ if (p->arity == 2)
+ bp = computekids(t->right, stringf("RIGHT_CHILD(%s)", v), bp, ip);
+ }
+ return bp;
+}
+
+/* emitkids - emit _kids */
+static void emitkids(Rule rules, int nrules) {
+ int i;
+ Rule r, *rc = alloc((nrules + 1 + 1)*sizeof *rc);
+ char **str = alloc((nrules + 1 + 1)*sizeof *str);
+
+ for (i = 0, r = rules; r; r = r->link) {
+ int j = 0;
+ char buf[1024], *bp = buf;
+ *computekids(r->pattern, "p", bp, &j) = 0;
+ for (j = 0; str[j] && strcmp(str[j], buf); j++)
+ ;
+ if (str[j] == NULL)
+ str[j] = strcpy(alloc(strlen(buf) + 1), buf);
+ r->kids = rc[j];
+ rc[j] = r;
+ }
+ print("static void %Pkids(NODEPTR_TYPE p, int eruleno, NODEPTR_TYPE kids[]) {\n"
+"%1if (!p)\n%2fatal(\"%Pkids\", \"Null tree\\n\", 0);\n"
+"%1if (!kids)\n%2fatal(\"%Pkids\", \"Null kids\\n\", 0);\n"
+"%1switch (eruleno) {\n");
+ for (i = 0; (r = rc[i]) != NULL; i++) {
+ for ( ; r; r = r->kids)
+ print("%1case %d: /* %R */\n", r->ern, r);
+ print("%s%2break;\n", str[i]);
+ }
+ print("%1default:\n%2fatal(\"%Pkids\", \"Bad rule number %%d\\n\", eruleno);\n%1}\n}\n\n");
+}
+
+/* emitlabel - emit label function */
+static void emitlabel(Term terms, Nonterm start, int ntnumber) {
+ int i;
+ Term p;
+
+ print("static void %Plabel(NODEPTR_TYPE a) {\n%1int c;\n"
+"%1struct %Pstate *p;\n\n"
+"%1if (!a)\n%2fatal(\"%Plabel\", \"Null tree\\n\", 0);\n");
+ print("%1STATE_LABEL(a) = p = allocate(sizeof *p, FUNC);\n"
+"%1p->rule._stmt = 0;\n");
+ for (i = 1; i <= ntnumber; i++)
+ print("%1p->cost[%d] =\n", i);
+ print("%20x7fff;\n%1switch (OP_LABEL(a)) {\n");
+ for (p = terms; p; p = p->link)
+ emitcase(p, ntnumber);
+ print("%1default:\n"
+"%2fatal(\"%Plabel\", \"Bad terminal %%d\\n\", OP_LABEL(a));\n%1}\n}\n\n");
+}
+
+/* computents - fill in bp with _nts vector for tree t */
+static char *computents(Tree t, char *bp) {
+ if (t) {
+ Nonterm p = t->op;
+ if (p->kind == NONTERM) {
+ sprintf(bp, "%s_%s_NT, ", prefix, p->name);
+ bp += strlen(bp);
+ } else
+ bp = computents(t->right, computents(t->left, bp));
+ }
+ return bp;
+}
+
+/* emitnts - emit _nts ragged array */
+static void emitnts(Rule rules, int nrules) {
+ Rule r;
+ int i, j, *nts = alloc((nrules + 1)*sizeof *nts);
+ char **str = alloc((nrules + 1)*sizeof *str);
+
+ for (i = 0, r = rules; r; r = r->link) {
+ char buf[1024];
+ *computents(r->pattern, buf) = 0;
+ for (j = 0; str[j] && strcmp(str[j], buf); j++)
+ ;
+ if (str[j] == NULL) {
+ print("static short %Pnts_%d[] = { %s0 };\n", j, buf);
+ str[j] = strcpy(alloc(strlen(buf) + 1), buf);
+ }
+ nts[i++] = j;
+ }
+ print("\nstatic short *%Pnts[] = {\n");
+ for (i = j = 0, r = rules; r; r = r->link) {
+ for ( ; j < r->ern; j++)
+ print("%10,%1/* %d */\n", j);
+ print("%1%Pnts_%d,%1/* %d */\n", nts[i++], j++);
+ }
+ print("};\n\n");
+}
+
+/* emitrecalc - emit code that tests for recalculation of INDIR?(VREGP) */
+static void emitrecalc(char *pre, Term root, Term kid) {
+ if (root->kind == TERM && strncmp(root->name, "INDIR", 5) == 0
+ && kid->kind == TERM && strcmp(kid->name, "VREGP" ) == 0) {
+ Nonterm p;
+ print("%sif (mayrecalc(a)) {\n", pre);
+ print("%s%1struct %Pstate *q = a->syms[RX]->u.t.cse->x.state;\n", pre);
+ for (p = nts; p; p = p->link) {
+ print("%s%1if (q->cost[%P%S_NT] == 0) {\n", pre, p);
+ print("%s%2p->cost[%P%S_NT] = 0;\n", pre, p);
+ print("%s%2p->rule.%P%S = q->rule.%P%S;\n", pre, p, p);
+ print("%s%1}\n", pre);
+ }
+ print("%s}\n", pre);
+ }
+}
+
+/* emitrecord - emit code that tests for a winning match of rule r */
+static void emitrecord(char *pre, Rule r, char *c, int cost) {
+ if (Tflag)
+ print("%s%Ptrace(a, %d, %s + %d, p->cost[%P%S_NT]);\n",
+ pre, r->ern, c, cost, r->lhs);
+ print("%sif (", pre);
+ print("%s + %d < p->cost[%P%S_NT]) {\n"
+"%s%1p->cost[%P%S_NT] = %s + %d;\n%s%1p->rule.%P%S = %d;\n",
+ c, cost, r->lhs, pre, r->lhs, c, cost, pre, r->lhs,
+ r->packed);
+ if (r->lhs->chain)
+ print("%s%1%Pclosure_%S(a, %s + %d);\n", pre, r->lhs, c, cost);
+ print("%s}\n", pre);
+}
+
+/* emitrule - emit decoding vectors and _rule */
+static void emitrule(Nonterm nts) {
+ Nonterm p;
+
+ for (p = nts; p; p = p->link) {
+ Rule r;
+ print("static short %Pdecode_%S[] = {\n%10,\n", p);
+ for (r = p->rules; r; r = r->decode)
+ print("%1%d,\n", r->ern);
+ print("};\n\n");
+ }
+ print("static int %Prule(void *state, int goalnt) {\n"
+"%1if (goalnt < 1 || goalnt > %d)\n%2fatal(\"%Prule\", \"Bad goal nonterminal %%d\\n\", goalnt);\n"
+"%1if (!state)\n%2return 0;\n%1switch (goalnt) {\n", ntnumber);
+ for (p = nts; p; p = p->link)
+ print("%1case %P%S_NT:"
+"%1return %Pdecode_%S[((struct %Pstate *)state)->rule.%P%S];\n", p, p, p);
+ print("%1default:\n%2fatal(\"%Prule\", \"Bad goal nonterminal %%d\\n\", goalnt);\n%2return 0;\n%1}\n}\n\n");
+}
+
+/* emitstring - emit arrays of templates, instruction flags, and rules */
+static void emitstring(Rule rules) {
+ Rule r;
+
+ print("static char *%Ptemplates[] = {\n");
+ print("/* 0 */%10,\n");
+ for (r = rules; r; r = r->link)
+ print("/* %d */%1\"%s\",%1/* %R */\n", r->ern, r->template, r);
+ print("};\n");
+ print("\nstatic char %Pisinstruction[] = {\n");
+ print("/* 0 */%10,\n");
+ for (r = rules; r; r = r->link) {
+ int len = strlen(r->template);
+ print("/* %d */%1%d,%1/* %s */\n", r->ern,
+ len >= 2 && r->template[len-2] == '\\' && r->template[len-1] == 'n',
+ r->template);
+ }
+ print("};\n");
+ print("\nstatic char *%Pstring[] = {\n");
+ print("/* 0 */%10,\n");
+ for (r = rules; r; r = r->link)
+ print("/* %d */%1\"%R\",\n", r->ern, r);
+ print("};\n\n");
+}
+
+/* emitstruct - emit the definition of the state structure */
+static void emitstruct(Nonterm nts, int ntnumber) {
+ print("struct %Pstate {\n%1short cost[%d];\n%1struct {\n", ntnumber + 1);
+ for ( ; nts; nts = nts->link) {
+ int n = 1, m = nts->lhscount;
+ while ((m >>= 1) != 0)
+ n++;
+ print("%2unsigned int %P%S:%d;\n", nts, n);
+ }
+ print("%1} rule;\n};\n\n");
+}
+
+/* emittest - emit clause for testing a match */
+static void emittest(Tree t, char *v, char *suffix) {
+ Term p = t->op;
+
+ if (p->kind == TERM) {
+ print("%3%s->op == %d%s/* %S */\n", v, p->esn,
+ t->nterms > 1 ? " && " : suffix, p);
+ if (t->left)
+ emittest(t->left, stringf("LEFT_CHILD(%s)", v),
+ t->right && t->right->nterms ? " && " : suffix);
+ if (t->right)
+ emittest(t->right, stringf("RIGHT_CHILD(%s)", v), suffix);
+ }
+}