xref: /freebsd/contrib/byacc/yaccpar.skel (revision 13ea0450a9c8742119d36f3bf8f47accdce46e54) 
1/* $Id: yaccpar.skel,v 1.9 2017/04/30 23:28:17 tom Exp $ */
2
3#include "defs.h"
4
5/*  If the skeleton is changed, the banner should be changed so that	*/
6/*  the altered version can be easily distinguished from the original.	*/
7/*									*/
8/*  The #defines included with the banner are there because they are	*/
9/*  useful in subsequent code.  The macros #defined in the header or	*/
10/*  the body either are not useful outside of semantic actions or	*/
11/*  are conditional.							*/
12
13%% banner
14/* original parser id follows */
15/* yysccsid[] = "@(#)yaccpar	1.9 (Berkeley) 02/21/93" */
16/* (use YYMAJOR/YYMINOR for ifdefs dependent on parser version) */
17
18#define YYBYACC 1
19%% insert VERSION here
20
21#define YYEMPTY        (-1)
22#define yyclearin      (yychar = YYEMPTY)
23#define yyerrok        (yyerrflag = 0)
24#define YYRECOVERING() (yyerrflag != 0)
25#define YYENOMEM       (-2)
26#define YYEOF          0
27%% xdecls
28
29extern int YYPARSE_DECL();
30%% tables
31extern YYINT yylhs[];
32extern YYINT yylen[];
33extern YYINT yydefred[];
34extern YYINT yydgoto[];
35extern YYINT yysindex[];
36extern YYINT yyrindex[];
37extern YYINT yygindex[];
38extern YYINT yytable[];
39extern YYINT yycheck[];
40
41#if YYDEBUG || defined(yytname)
42extern char *yyname[];
43#endif
44#if YYDEBUG
45extern char *yyrule[];
46#endif
47%% global_vars
48
49int      yydebug;
50int      yynerrs;
51%% impure_vars
52
53int      yyerrflag;
54int      yychar;
55YYSTYPE  yyval;
56YYSTYPE  yylval;
57%% hdr_defs
58
59/* define the initial stack-sizes */
60#ifdef YYSTACKSIZE
61#undef YYMAXDEPTH
62#define YYMAXDEPTH  YYSTACKSIZE
63#else
64#ifdef YYMAXDEPTH
65#define YYSTACKSIZE YYMAXDEPTH
66#else
67#define YYSTACKSIZE 10000
68#define YYMAXDEPTH  10000
69#endif
70#endif
71
72#define YYINITSTACKSIZE 200
73
74typedef struct {
75    unsigned stacksize;
76    YYINT    *s_base;
77    YYINT    *s_mark;
78    YYINT    *s_last;
79    YYSTYPE  *l_base;
80    YYSTYPE  *l_mark;
81} YYSTACKDATA;
82%% hdr_vars
83/* variables for the parser stack */
84static YYSTACKDATA yystack;
85%% body_vars
86    int      yyerrflag;
87    int      yychar;
88    YYSTYPE  yyval;
89    YYSTYPE  yylval;
90
91    /* variables for the parser stack */
92    YYSTACKDATA yystack;
93%% body_1
94
95#if YYDEBUG
96#include <stdio.h>	/* needed for printf */
97#endif
98
99#include <stdlib.h>	/* needed for malloc, etc */
100#include <string.h>	/* needed for memset */
101
102/* allocate initial stack or double stack size, up to YYMAXDEPTH */
103static int yygrowstack(YYSTACKDATA *data)
104{
105    int i;
106    unsigned newsize;
107    YYINT *newss;
108    YYSTYPE *newvs;
109
110    if ((newsize = data->stacksize) == 0)
111        newsize = YYINITSTACKSIZE;
112    else if (newsize >= YYMAXDEPTH)
113        return YYENOMEM;
114    else if ((newsize *= 2) > YYMAXDEPTH)
115        newsize = YYMAXDEPTH;
116
117    i = (int) (data->s_mark - data->s_base);
118    newss = (YYINT *)realloc(data->s_base, newsize * sizeof(*newss));
119    if (newss == 0)
120        return YYENOMEM;
121
122    data->s_base = newss;
123    data->s_mark = newss + i;
124
125    newvs = (YYSTYPE *)realloc(data->l_base, newsize * sizeof(*newvs));
126    if (newvs == 0)
127        return YYENOMEM;
128
129    data->l_base = newvs;
130    data->l_mark = newvs + i;
131
132    data->stacksize = newsize;
133    data->s_last = data->s_base + newsize - 1;
134    return 0;
135}
136
137#if YYPURE || defined(YY_NO_LEAKS)
138static void yyfreestack(YYSTACKDATA *data)
139{
140    free(data->s_base);
141    free(data->l_base);
142    memset(data, 0, sizeof(*data));
143}
144#else
145#define yyfreestack(data) /* nothing */
146#endif
147
148#define YYABORT  goto yyabort
149#define YYREJECT goto yyabort
150#define YYACCEPT goto yyaccept
151#define YYERROR  goto yyerrlab
152
153int
154YYPARSE_DECL()
155{
156%% body_2
157    int yym, yyn, yystate;
158#if YYDEBUG
159    const char *yys;
160
161    if ((yys = getenv("YYDEBUG")) != 0)
162    {
163        yyn = *yys;
164        if (yyn >= '0' && yyn <= '9')
165            yydebug = yyn - '0';
166    }
167#endif
168
169%% init_vars
170    memset(&yyval,  0, sizeof(yyval));
171    memset(&yylval, 0, sizeof(yylval));
172
173%% body_3
174    yym = 0;
175    yyn = 0;
176    yynerrs = 0;
177    yyerrflag = 0;
178    yychar = YYEMPTY;
179    yystate = 0;
180
181#if YYPURE
182    memset(&yystack, 0, sizeof(yystack));
183#endif
184
185    if (yystack.s_base == NULL && yygrowstack(&yystack) == YYENOMEM) goto yyoverflow;
186    yystack.s_mark = yystack.s_base;
187    yystack.l_mark = yystack.l_base;
188    yystate = 0;
189    *yystack.s_mark = 0;
190
191yyloop:
192    if ((yyn = yydefred[yystate]) != 0) goto yyreduce;
193    if (yychar < 0)
194    {
195        yychar = YYLEX;
196        if (yychar < 0) yychar = YYEOF;
197#if YYDEBUG
198        if (yydebug)
199        {
200            if ((yys = yyname[YYTRANSLATE(yychar)]) == NULL) yys = yyname[YYUNDFTOKEN];
201            printf("%sdebug: state %d, reading %d (%s)\n",
202                    YYPREFIX, yystate, yychar, yys);
203        }
204#endif
205    }
206    if (((yyn = yysindex[yystate]) != 0) && (yyn += yychar) >= 0 &&
207            yyn <= YYTABLESIZE && yycheck[yyn] == (YYINT) yychar)
208    {
209#if YYDEBUG
210        if (yydebug)
211            printf("%sdebug: state %d, shifting to state %d\n",
212                    YYPREFIX, yystate, yytable[yyn]);
213#endif
214        if (yystack.s_mark >= yystack.s_last && yygrowstack(&yystack) == YYENOMEM) goto yyoverflow;
215        yystate = yytable[yyn];
216        *++yystack.s_mark = yytable[yyn];
217        *++yystack.l_mark = yylval;
218        yychar = YYEMPTY;
219        if (yyerrflag > 0)  --yyerrflag;
220        goto yyloop;
221    }
222    if (((yyn = yyrindex[yystate]) != 0) && (yyn += yychar) >= 0 &&
223            yyn <= YYTABLESIZE && yycheck[yyn] == (YYINT) yychar)
224    {
225        yyn = yytable[yyn];
226        goto yyreduce;
227    }
228    if (yyerrflag != 0) goto yyinrecovery;
229
230    YYERROR_CALL("syntax error");
231
232    goto yyerrlab; /* redundant goto avoids 'unused label' warning */
233yyerrlab:
234    ++yynerrs;
235
236yyinrecovery:
237    if (yyerrflag < 3)
238    {
239        yyerrflag = 3;
240        for (;;)
241        {
242            if (((yyn = yysindex[*yystack.s_mark]) != 0) && (yyn += YYERRCODE) >= 0 &&
243                    yyn <= YYTABLESIZE && yycheck[yyn] == (YYINT) YYERRCODE)
244            {
245#if YYDEBUG
246                if (yydebug)
247                    printf("%sdebug: state %d, error recovery shifting\
248 to state %d\n", YYPREFIX, *yystack.s_mark, yytable[yyn]);
249#endif
250                if (yystack.s_mark >= yystack.s_last && yygrowstack(&yystack) == YYENOMEM) goto yyoverflow;
251                yystate = yytable[yyn];
252                *++yystack.s_mark = yytable[yyn];
253                *++yystack.l_mark = yylval;
254                goto yyloop;
255            }
256            else
257            {
258#if YYDEBUG
259                if (yydebug)
260                    printf("%sdebug: error recovery discarding state %d\n",
261                            YYPREFIX, *yystack.s_mark);
262#endif
263                if (yystack.s_mark <= yystack.s_base) goto yyabort;
264                --yystack.s_mark;
265                --yystack.l_mark;
266            }
267        }
268    }
269    else
270    {
271        if (yychar == YYEOF) goto yyabort;
272#if YYDEBUG
273        if (yydebug)
274        {
275            if ((yys = yyname[YYTRANSLATE(yychar)]) == NULL) yys = yyname[YYUNDFTOKEN];
276            printf("%sdebug: state %d, error recovery discards token %d (%s)\n",
277                    YYPREFIX, yystate, yychar, yys);
278        }
279#endif
280        yychar = YYEMPTY;
281        goto yyloop;
282    }
283
284yyreduce:
285#if YYDEBUG
286    if (yydebug)
287        printf("%sdebug: state %d, reducing by rule %d (%s)\n",
288                YYPREFIX, yystate, yyn, yyrule[yyn]);
289#endif
290    yym = yylen[yyn];
291    if (yym > 0)
292        yyval = yystack.l_mark[1-yym];
293    else
294        memset(&yyval, 0, sizeof yyval);
295
296    switch (yyn)
297    {
298%% trailer
299    }
300    yystack.s_mark -= yym;
301    yystate = *yystack.s_mark;
302    yystack.l_mark -= yym;
303    yym = yylhs[yyn];
304    if (yystate == 0 && yym == 0)
305    {
306#if YYDEBUG
307        if (yydebug)
308            printf("%sdebug: after reduction, shifting from state 0 to\
309 state %d\n", YYPREFIX, YYFINAL);
310#endif
311        yystate = YYFINAL;
312        *++yystack.s_mark = YYFINAL;
313        *++yystack.l_mark = yyval;
314        if (yychar < 0)
315        {
316            yychar = YYLEX;
317            if (yychar < 0) yychar = YYEOF;
318#if YYDEBUG
319            if (yydebug)
320            {
321                if ((yys = yyname[YYTRANSLATE(yychar)]) == NULL) yys = yyname[YYUNDFTOKEN];
322                printf("%sdebug: state %d, reading %d (%s)\n",
323                        YYPREFIX, YYFINAL, yychar, yys);
324            }
325#endif
326        }
327        if (yychar == YYEOF) goto yyaccept;
328        goto yyloop;
329    }
330    if (((yyn = yygindex[yym]) != 0) && (yyn += yystate) >= 0 &&
331            yyn <= YYTABLESIZE && yycheck[yyn] == (YYINT) yystate)
332        yystate = yytable[yyn];
333    else
334        yystate = yydgoto[yym];
335#if YYDEBUG
336    if (yydebug)
337        printf("%sdebug: after reduction, shifting from state %d \
338to state %d\n", YYPREFIX, *yystack.s_mark, yystate);
339#endif
340    if (yystack.s_mark >= yystack.s_last && yygrowstack(&yystack) == YYENOMEM) goto yyoverflow;
341    *++yystack.s_mark = (YYINT) yystate;
342    *++yystack.l_mark = yyval;
343    goto yyloop;
344
345yyoverflow:
346    YYERROR_CALL("yacc stack overflow");
347
348yyabort:
349    yyfreestack(&yystack);
350    return (1);
351
352yyaccept:
353    yyfreestack(&yystack);
354    return (0);
355}
356