This source file includes following definitions.
- expr__error
- lookup_id
- expr__symbol
- expr__lex
- expr__add_id
- expr__ctx_init
- already_seen
- expr__find_other
1
2 %{
3 #include "util.h"
4 #include "util/debug.h"
5 #include <stdlib.h>
6 #define IN_EXPR_Y 1
7 #include "expr.h"
8 #include "smt.h"
9 #include <assert.h>
10 #include <string.h>
11
12 #define MAXIDLEN 256
13 %}
14
15 %pure-parser
16 %parse-param { double *final_val }
17 %parse-param { struct parse_ctx *ctx }
18 %parse-param { const char **pp }
19 %lex-param { const char **pp }
20
21 %union {
22 double num;
23 char id[MAXIDLEN+1];
24 }
25
26 %token <num> NUMBER
27 %token <id> ID
28 %token MIN MAX IF ELSE SMT_ON
29 %left MIN MAX IF
30 %left '|'
31 %left '^'
32 %left '&'
33 %left '-' '+'
34 %left '*' '/' '%'
35 %left NEG NOT
36 %type <num> expr if_expr
37
38 %{
39 static int expr__lex(YYSTYPE *res, const char **pp);
40
41 static void expr__error(double *final_val __maybe_unused,
42 struct parse_ctx *ctx __maybe_unused,
43 const char **pp __maybe_unused,
44 const char *s)
45 {
46 pr_debug("%s\n", s);
47 }
48
49 static int lookup_id(struct parse_ctx *ctx, char *id, double *val)
50 {
51 int i;
52
53 for (i = 0; i < ctx->num_ids; i++) {
54 if (!strcasecmp(ctx->ids[i].name, id)) {
55 *val = ctx->ids[i].val;
56 return 0;
57 }
58 }
59 return -1;
60 }
61
62 %}
63 %%
64
65 all_expr: if_expr { *final_val = $1; }
66 ;
67
68 if_expr:
69 expr IF expr ELSE expr { $$ = $3 ? $1 : $5; }
70 | expr
71 ;
72
73 expr: NUMBER
74 | ID { if (lookup_id(ctx, $1, &$$) < 0) {
75 pr_debug("%s not found\n", $1);
76 YYABORT;
77 }
78 }
79 | expr '|' expr { $$ = (long)$1 | (long)$3; }
80 | expr '&' expr { $$ = (long)$1 & (long)$3; }
81 | expr '^' expr { $$ = (long)$1 ^ (long)$3; }
82 | expr '+' expr { $$ = $1 + $3; }
83 | expr '-' expr { $$ = $1 - $3; }
84 | expr '*' expr { $$ = $1 * $3; }
85 | expr '/' expr { if ($3 == 0) YYABORT; $$ = $1 / $3; }
86 | expr '%' expr { if ((long)$3 == 0) YYABORT; $$ = (long)$1 % (long)$3; }
87 | '-' expr %prec NEG { $$ = -$2; }
88 | '(' if_expr ')' { $$ = $2; }
89 | MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; }
90 | MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; }
91 | SMT_ON { $$ = smt_on() > 0; }
92 ;
93
94 %%
95
96 static int expr__symbol(YYSTYPE *res, const char *p, const char **pp)
97 {
98 char *dst = res->id;
99 const char *s = p;
100
101 if (*p == '#')
102 *dst++ = *p++;
103
104 while (isalnum(*p) || *p == '_' || *p == '.' || *p == ':' || *p == '@' || *p == '\\') {
105 if (p - s >= MAXIDLEN)
106 return -1;
107
108
109
110
111 if (*p == '@')
112 *dst++ = '/';
113 else if (*p == '\\')
114 *dst++ = *++p;
115 else
116 *dst++ = *p;
117 p++;
118 }
119 *dst = 0;
120 *pp = p;
121 dst = res->id;
122 switch (dst[0]) {
123 case 'm':
124 if (!strcmp(dst, "min"))
125 return MIN;
126 if (!strcmp(dst, "max"))
127 return MAX;
128 break;
129 case 'i':
130 if (!strcmp(dst, "if"))
131 return IF;
132 break;
133 case 'e':
134 if (!strcmp(dst, "else"))
135 return ELSE;
136 break;
137 case '#':
138 if (!strcasecmp(dst, "#smt_on"))
139 return SMT_ON;
140 break;
141 }
142 return ID;
143 }
144
145 static int expr__lex(YYSTYPE *res, const char **pp)
146 {
147 int tok;
148 const char *s;
149 const char *p = *pp;
150
151 while (isspace(*p))
152 p++;
153 s = p;
154 switch (*p++) {
155 case '#':
156 case 'a' ... 'z':
157 case 'A' ... 'Z':
158 return expr__symbol(res, p - 1, pp);
159 case '0' ... '9': case '.':
160 res->num = strtod(s, (char **)&p);
161 tok = NUMBER;
162 break;
163 default:
164 tok = *s;
165 break;
166 }
167 *pp = p;
168 return tok;
169 }
170
171
172 void expr__add_id(struct parse_ctx *ctx, const char *name, double val)
173 {
174 int idx;
175 assert(ctx->num_ids < MAX_PARSE_ID);
176 idx = ctx->num_ids++;
177 ctx->ids[idx].name = name;
178 ctx->ids[idx].val = val;
179 }
180
181 void expr__ctx_init(struct parse_ctx *ctx)
182 {
183 ctx->num_ids = 0;
184 }
185
186 static bool already_seen(const char *val, const char *one, const char **other,
187 int num_other)
188 {
189 int i;
190
191 if (one && !strcasecmp(one, val))
192 return true;
193 for (i = 0; i < num_other; i++)
194 if (!strcasecmp(other[i], val))
195 return true;
196 return false;
197 }
198
199 int expr__find_other(const char *p, const char *one, const char ***other,
200 int *num_otherp)
201 {
202 const char *orig = p;
203 int err = -1;
204 int num_other;
205
206 *other = malloc((EXPR_MAX_OTHER + 1) * sizeof(char *));
207 if (!*other)
208 return -1;
209
210 num_other = 0;
211 for (;;) {
212 YYSTYPE val;
213 int tok = expr__lex(&val, &p);
214 if (tok == 0) {
215 err = 0;
216 break;
217 }
218 if (tok == ID && !already_seen(val.id, one, *other, num_other)) {
219 if (num_other >= EXPR_MAX_OTHER - 1) {
220 pr_debug("Too many extra events in %s\n", orig);
221 break;
222 }
223 (*other)[num_other] = strdup(val.id);
224 if (!(*other)[num_other])
225 return -1;
226 num_other++;
227 }
228 }
229 (*other)[num_other] = NULL;
230 *num_otherp = num_other;
231 if (err) {
232 *num_otherp = 0;
233 free(*other);
234 *other = NULL;
235 }
236 return err;
237 }