Filter: make bitwise and, or, xor higher prio than relational expressions
[lttng-tools.git] / src / lib / lttng-ctl / filter / filter-parser.y
CommitLineData
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1%{
2/*
3 * filter-parser.y
4 *
5 * LTTng filter expression parser
6 *
7 * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
9 * This library is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License, version 2.1 only,
11 * as published by the Free Software Foundation.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 * Grammar inspired from http://www.quut.com/c/ANSI-C-grammar-y.html
23 */
24
25#include <stdio.h>
26#include <unistd.h>
27#include <string.h>
28#include <stdlib.h>
29#include <assert.h>
30#include <errno.h>
31#include <inttypes.h>
953192ba 32#include "filter-ast.h"
95b9bd90 33#include "filter-parser.h"
953192ba 34
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35#include <common/macros.h>
36
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37#define WIDTH_u64_SCANF_IS_A_BROKEN_API "20"
38#define WIDTH_o64_SCANF_IS_A_BROKEN_API "22"
39#define WIDTH_x64_SCANF_IS_A_BROKEN_API "17"
40#define WIDTH_lg_SCANF_IS_A_BROKEN_API "4096" /* Hugely optimistic approximation */
41
a187da1a 42LTTNG_HIDDEN
953192ba 43int yydebug;
a187da1a 44LTTNG_HIDDEN
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45int filter_parser_debug = 0;
46
a187da1a 47LTTNG_HIDDEN
9039edd4 48int yyparse(struct filter_parser_ctx *parser_ctx, yyscan_t scanner);
a187da1a 49LTTNG_HIDDEN
9039edd4 50int yylex(union YYSTYPE *yyval, yyscan_t scanner);
a187da1a 51LTTNG_HIDDEN
953192ba 52int yylex_init_extra(struct filter_parser_ctx *parser_ctx, yyscan_t * ptr_yy_globals);
a187da1a 53LTTNG_HIDDEN
953192ba 54int yylex_destroy(yyscan_t yyparser_ctx);
a187da1a 55LTTNG_HIDDEN
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56void yyrestart(FILE * in_str, yyscan_t parser_ctx);
57
58struct gc_string {
59 struct cds_list_head gc;
60 size_t alloclen;
61 char s[];
62};
63
64static const char *node_type_to_str[] = {
65 [ NODE_UNKNOWN ] = "NODE_UNKNOWN",
66 [ NODE_ROOT ] = "NODE_ROOT",
67 [ NODE_EXPRESSION ] = "NODE_EXPRESSION",
68 [ NODE_OP ] = "NODE_OP",
69 [ NODE_UNARY_OP ] = "NODE_UNARY_OP",
70};
71
a187da1a 72LTTNG_HIDDEN
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73const char *node_type(struct filter_node *node)
74{
75 if (node->type < NR_NODE_TYPES)
76 return node_type_to_str[node->type];
77 else
78 return NULL;
79}
80
81static struct gc_string *gc_string_alloc(struct filter_parser_ctx *parser_ctx,
82 size_t len)
83{
84 struct gc_string *gstr;
85 size_t alloclen;
86
87 /* TODO: could be faster with find first bit or glib Gstring */
88 /* sizeof long to account for malloc header (int or long ?) */
89 for (alloclen = 8; alloclen < sizeof(long) + sizeof(*gstr) + len;
90 alloclen *= 2);
91
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92 gstr = zmalloc(alloclen);
93 if (!gstr) {
94 goto end;
95 }
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96 cds_list_add(&gstr->gc, &parser_ctx->allocated_strings);
97 gstr->alloclen = alloclen;
be61ee34 98end:
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99 return gstr;
100}
101
102/*
103 * note: never use gc_string_append on a string that has external references.
104 * gsrc will be garbage collected immediately, and gstr might be.
105 * Should only be used to append characters to a string literal or constant.
106 */
a187da1a 107LTTNG_HIDDEN
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108struct gc_string *gc_string_append(struct filter_parser_ctx *parser_ctx,
109 struct gc_string *gstr,
110 struct gc_string *gsrc)
111{
112 size_t newlen = strlen(gsrc->s) + strlen(gstr->s) + 1;
113 size_t alloclen;
114
115 /* TODO: could be faster with find first bit or glib Gstring */
116 /* sizeof long to account for malloc header (int or long ?) */
117 for (alloclen = 8; alloclen < sizeof(long) + sizeof(*gstr) + newlen;
118 alloclen *= 2);
119
120 if (alloclen > gstr->alloclen) {
121 struct gc_string *newgstr;
122
123 newgstr = gc_string_alloc(parser_ctx, newlen);
124 strcpy(newgstr->s, gstr->s);
125 strcat(newgstr->s, gsrc->s);
126 cds_list_del(&gstr->gc);
127 free(gstr);
128 gstr = newgstr;
129 } else {
130 strcat(gstr->s, gsrc->s);
131 }
132 cds_list_del(&gsrc->gc);
133 free(gsrc);
134 return gstr;
135}
136
a187da1a 137LTTNG_HIDDEN
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138void setstring(struct filter_parser_ctx *parser_ctx, YYSTYPE *lvalp, const char *src)
139{
140 lvalp->gs = gc_string_alloc(parser_ctx, strlen(src) + 1);
141 strcpy(lvalp->gs->s, src);
142}
143
144static struct filter_node *make_node(struct filter_parser_ctx *scanner,
145 enum node_type type)
146{
147 struct filter_ast *ast = filter_parser_get_ast(scanner);
148 struct filter_node *node;
149
be61ee34 150 node = zmalloc(sizeof(*node));
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151 if (!node)
152 return NULL;
153 memset(node, 0, sizeof(*node));
154 node->type = type;
155 cds_list_add(&node->gc, &ast->allocated_nodes);
156
157 switch (type) {
158 case NODE_ROOT:
159 fprintf(stderr, "[error] %s: trying to create root node\n", __func__);
160 break;
161
162 case NODE_EXPRESSION:
163 break;
164 case NODE_OP:
165 break;
166 case NODE_UNARY_OP:
167 break;
168
169 case NODE_UNKNOWN:
170 default:
171 fprintf(stderr, "[error] %s: unknown node type %d\n", __func__,
172 (int) type);
173 break;
174 }
175
176 return node;
177}
178
179static struct filter_node *make_op_node(struct filter_parser_ctx *scanner,
180 enum op_type type,
181 struct filter_node *lchild,
182 struct filter_node *rchild)
183{
184 struct filter_ast *ast = filter_parser_get_ast(scanner);
185 struct filter_node *node;
186
be61ee34 187 node = zmalloc(sizeof(*node));
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188 if (!node)
189 return NULL;
190 memset(node, 0, sizeof(*node));
191 node->type = NODE_OP;
192 cds_list_add(&node->gc, &ast->allocated_nodes);
193 node->u.op.type = type;
194 node->u.op.lchild = lchild;
195 node->u.op.rchild = rchild;
196 return node;
197}
198
a187da1a 199LTTNG_HIDDEN
9039edd4 200void yyerror(struct filter_parser_ctx *parser_ctx, yyscan_t scanner, const char *str)
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201{
202 fprintf(stderr, "error %s\n", str);
203}
204
a187da1a 205LTTNG_HIDDEN
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206int yywrap(void)
207{
208 return 1;
209}
210
211#define parse_error(parser_ctx, str) \
212do { \
9039edd4 213 yyerror(parser_ctx, parser_ctx->scanner, YY_("parse error: " str "\n")); \
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214 YYERROR; \
215} while (0)
216
217static void free_strings(struct cds_list_head *list)
218{
219 struct gc_string *gstr, *tmp;
220
221 cds_list_for_each_entry_safe(gstr, tmp, list, gc)
222 free(gstr);
223}
224
225static struct filter_ast *filter_ast_alloc(void)
226{
227 struct filter_ast *ast;
228
be61ee34 229 ast = zmalloc(sizeof(*ast));
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230 if (!ast)
231 return NULL;
232 memset(ast, 0, sizeof(*ast));
233 CDS_INIT_LIST_HEAD(&ast->allocated_nodes);
234 ast->root.type = NODE_ROOT;
235 return ast;
236}
237
238static void filter_ast_free(struct filter_ast *ast)
239{
240 struct filter_node *node, *tmp;
241
242 cds_list_for_each_entry_safe(node, tmp, &ast->allocated_nodes, gc)
243 free(node);
37600d79 244 free(ast);
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245}
246
a187da1a 247LTTNG_HIDDEN
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248int filter_parser_ctx_append_ast(struct filter_parser_ctx *parser_ctx)
249{
9039edd4 250 return yyparse(parser_ctx, parser_ctx->scanner);
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251}
252
a187da1a 253LTTNG_HIDDEN
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254struct filter_parser_ctx *filter_parser_ctx_alloc(FILE *input)
255{
256 struct filter_parser_ctx *parser_ctx;
257 int ret;
258
259 yydebug = filter_parser_debug;
260
be61ee34 261 parser_ctx = zmalloc(sizeof(*parser_ctx));
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262 if (!parser_ctx)
263 return NULL;
264 memset(parser_ctx, 0, sizeof(*parser_ctx));
265
266 ret = yylex_init_extra(parser_ctx, &parser_ctx->scanner);
267 if (ret) {
268 fprintf(stderr, "yylex_init error\n");
269 goto cleanup_parser_ctx;
270 }
271 /* Start processing new stream */
272 yyrestart(input, parser_ctx->scanner);
273
274 parser_ctx->ast = filter_ast_alloc();
275 if (!parser_ctx->ast)
276 goto cleanup_lexer;
277 CDS_INIT_LIST_HEAD(&parser_ctx->allocated_strings);
278
279 if (yydebug)
280 fprintf(stdout, "parser_ctx input is a%s.\n",
281 isatty(fileno(input)) ? "n interactive tty" :
282 " noninteractive file");
283
284 return parser_ctx;
285
286cleanup_lexer:
287 ret = yylex_destroy(parser_ctx->scanner);
288 if (!ret)
289 fprintf(stderr, "yylex_destroy error\n");
290cleanup_parser_ctx:
291 free(parser_ctx);
292 return NULL;
293}
294
a187da1a 295LTTNG_HIDDEN
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296void filter_parser_ctx_free(struct filter_parser_ctx *parser_ctx)
297{
298 int ret;
299
300 free_strings(&parser_ctx->allocated_strings);
301 filter_ast_free(parser_ctx->ast);
302 ret = yylex_destroy(parser_ctx->scanner);
303 if (ret)
304 fprintf(stderr, "yylex_destroy error\n");
305 free(parser_ctx);
306}
307
308%}
309
310%define api.pure
311 /* %locations */
312%parse-param {struct filter_parser_ctx *parser_ctx}
9039edd4
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313%parse-param {yyscan_t scanner}
314%lex-param {yyscan_t scanner}
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315%start translation_unit
316%token CHARACTER_CONSTANT_START SQUOTE STRING_LITERAL_START DQUOTE
317%token ESCSEQ CHAR_STRING_TOKEN
e90d8561 318%token DECIMAL_CONSTANT OCTAL_CONSTANT HEXADECIMAL_CONSTANT FLOAT_CONSTANT
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319%token LSBRAC RSBRAC LPAREN RPAREN LBRAC RBRAC RARROW
320%token STAR PLUS MINUS
321%token MOD_OP DIV_OP RIGHT_OP LEFT_OP
322%token EQ_OP NE_OP LE_OP GE_OP LT_OP GT_OP AND_OP OR_OP NOT_OP
323%token ASSIGN COLON SEMICOLON DOTDOTDOT DOT EQUAL COMMA
324%token XOR_BIN AND_BIN OR_BIN NOT_BIN
325
586dc72f 326%token <gs> IDENTIFIER GLOBAL_IDENTIFIER
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327%token ERROR
328%union
329{
330 long long ll;
331 char c;
332 struct gc_string *gs;
333 struct filter_node *n;
334}
335
336%type <gs> s_char s_char_sequence c_char c_char_sequence
337
338%type <n> primary_expression
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339%type <n> prefix_expression
340%type <n> prefix_expression_rec
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341%type <n> postfix_expression
342%type <n> unary_expression
343%type <n> unary_operator
344%type <n> multiplicative_expression
345%type <n> additive_expression
346%type <n> shift_expression
347%type <n> relational_expression
348%type <n> equality_expression
349%type <n> and_expression
350%type <n> exclusive_or_expression
351%type <n> inclusive_or_expression
352%type <n> logical_and_expression
353%type <n> logical_or_expression
354%type <n> expression
bff988fa 355%type <n> identifiers
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356
357%%
358
359
360/* 1.5 Constants */
361
362c_char_sequence:
363 c_char
364 { $$ = $1; }
365 | c_char_sequence c_char
366 { $$ = gc_string_append(parser_ctx, $1, $2); }
367 ;
368
369c_char:
370 CHAR_STRING_TOKEN
371 { $$ = yylval.gs; }
372 | ESCSEQ
373 {
374 parse_error(parser_ctx, "escape sequences not supported yet");
375 }
376 ;
377
378/* 1.6 String literals */
379
380s_char_sequence:
381 s_char
382 { $$ = $1; }
383 | s_char_sequence s_char
384 { $$ = gc_string_append(parser_ctx, $1, $2); }
385 ;
386
387s_char:
388 CHAR_STRING_TOKEN
389 { $$ = yylval.gs; }
390 | ESCSEQ
391 {
392 parse_error(parser_ctx, "escape sequences not supported yet");
393 }
394 ;
395
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396primary_expression:
397 DECIMAL_CONSTANT
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398 {
399 $$ = make_node(parser_ctx, NODE_EXPRESSION);
400 $$->u.expression.type = AST_EXP_CONSTANT;
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401 if (sscanf(yylval.gs->s, "%" WIDTH_u64_SCANF_IS_A_BROKEN_API SCNu64,
402 &$$->u.expression.u.constant) != 1) {
403 parse_error(parser_ctx, "cannot scanf decimal constant");
404 }
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405 }
406 | OCTAL_CONSTANT
407 {
408 $$ = make_node(parser_ctx, NODE_EXPRESSION);
409 $$->u.expression.type = AST_EXP_CONSTANT;
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410 if (!strcmp(yylval.gs->s, "0")) {
411 $$->u.expression.u.constant = 0;
412 } else if (sscanf(yylval.gs->s, "0%" WIDTH_o64_SCANF_IS_A_BROKEN_API SCNo64,
413 &$$->u.expression.u.constant) != 1) {
414 parse_error(parser_ctx, "cannot scanf octal constant");
415 }
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416 }
417 | HEXADECIMAL_CONSTANT
418 {
419 $$ = make_node(parser_ctx, NODE_EXPRESSION);
420 $$->u.expression.type = AST_EXP_CONSTANT;
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421 if (sscanf(yylval.gs->s, "0x%" WIDTH_x64_SCANF_IS_A_BROKEN_API SCNx64,
422 &$$->u.expression.u.constant) != 1) {
423 parse_error(parser_ctx, "cannot scanf hexadecimal constant");
424 }
953192ba 425 }
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426 | FLOAT_CONSTANT
427 {
428 $$ = make_node(parser_ctx, NODE_EXPRESSION);
429 $$->u.expression.type = AST_EXP_FLOAT_CONSTANT;
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430 if (sscanf(yylval.gs->s, "%" WIDTH_lg_SCANF_IS_A_BROKEN_API "lg",
431 &$$->u.expression.u.float_constant) != 1) {
432 parse_error(parser_ctx, "cannot scanf float constant");
433 }
e90d8561 434 }
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435 | STRING_LITERAL_START DQUOTE
436 {
437 $$ = make_node(parser_ctx, NODE_EXPRESSION);
438 $$->u.expression.type = AST_EXP_STRING;
439 $$->u.expression.u.string = "";
440 }
441 | STRING_LITERAL_START s_char_sequence DQUOTE
442 {
443 $$ = make_node(parser_ctx, NODE_EXPRESSION);
444 $$->u.expression.type = AST_EXP_STRING;
445 $$->u.expression.u.string = $2->s;
446 }
447 | CHARACTER_CONSTANT_START c_char_sequence SQUOTE
448 {
449 $$ = make_node(parser_ctx, NODE_EXPRESSION);
450 $$->u.expression.type = AST_EXP_STRING;
451 $$->u.expression.u.string = $2->s;
452 }
453 | LPAREN expression RPAREN
454 {
455 $$ = make_node(parser_ctx, NODE_EXPRESSION);
456 $$->u.expression.type = AST_EXP_NESTED;
457 $$->u.expression.u.child = $2;
458 }
459 ;
460
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461identifiers
462 : IDENTIFIER
463 {
464 $$ = make_node(parser_ctx, NODE_EXPRESSION);
465 $$->u.expression.type = AST_EXP_IDENTIFIER;
466 $$->u.expression.u.identifier = yylval.gs->s;
467 }
468 | GLOBAL_IDENTIFIER
469 {
470 $$ = make_node(parser_ctx, NODE_EXPRESSION);
471 $$->u.expression.type = AST_EXP_GLOBAL_IDENTIFIER;
472 $$->u.expression.u.identifier = yylval.gs->s;
473 }
474 ;
475
476prefix_expression_rec
477 : LSBRAC unary_expression RSBRAC
478 {
479 $$ = $2;
480 }
481 | LSBRAC unary_expression RSBRAC prefix_expression_rec
482 {
483 $$ = $2;
484 $$->u.expression.pre_op = AST_LINK_BRACKET;
485 $$->u.expression.prev = $4;
486 }
487 ;
488
489prefix_expression
490 : identifiers
491 {
492 $$ = $1;
493 }
494 | identifiers prefix_expression_rec
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495 {
496 $$ = $1;
497 $$->u.expression.pre_op = AST_LINK_BRACKET;
bff988fa 498 $$->u.expression.next_bracket = $2;
661dfdd1 499 }
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500 ;
501
502postfix_expression
503 : prefix_expression
953192ba 504 {
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505 $$ = $1;
506 }
507 | postfix_expression DOT prefix_expression
508 {
509 $$ = $3;
953192ba 510 $$->u.expression.post_op = AST_LINK_DOT;
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511 $$->u.expression.prev = $1;
512 }
bff988fa 513 | postfix_expression RARROW prefix_expression
953192ba 514 {
bff988fa 515 $$ = $3;
953192ba 516 $$->u.expression.post_op = AST_LINK_RARROW;
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517 $$->u.expression.prev = $1;
518 }
519 ;
520
521unary_expression
522 : postfix_expression
523 { $$ = $1; }
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524 | primary_expression
525 { $$ = $1; }
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526 | unary_operator unary_expression
527 {
528 $$ = $1;
529 $$->u.unary_op.child = $2;
530 }
531 ;
532
533unary_operator
534 : PLUS
535 {
536 $$ = make_node(parser_ctx, NODE_UNARY_OP);
537 $$->u.unary_op.type = AST_UNARY_PLUS;
538 }
539 | MINUS
540 {
541 $$ = make_node(parser_ctx, NODE_UNARY_OP);
542 $$->u.unary_op.type = AST_UNARY_MINUS;
543 }
544 | NOT_OP
545 {
546 $$ = make_node(parser_ctx, NODE_UNARY_OP);
547 $$->u.unary_op.type = AST_UNARY_NOT;
548 }
ab78f161
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549 | NOT_BIN
550 {
551 $$ = make_node(parser_ctx, NODE_UNARY_OP);
bff988fa 552 $$->u.unary_op.type = AST_UNARY_BIT_NOT;
ab78f161 553 }
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554 ;
555
556multiplicative_expression
557 : unary_expression
558 { $$ = $1; }
559 | multiplicative_expression STAR unary_expression
560 {
561 $$ = make_op_node(parser_ctx, AST_OP_MUL, $1, $3);
562 }
563 | multiplicative_expression DIV_OP unary_expression
564 {
565 $$ = make_op_node(parser_ctx, AST_OP_DIV, $1, $3);
566 }
567 | multiplicative_expression MOD_OP unary_expression
568 {
569 $$ = make_op_node(parser_ctx, AST_OP_MOD, $1, $3);
570 }
571 ;
572
573additive_expression
574 : multiplicative_expression
575 { $$ = $1; }
576 | additive_expression PLUS multiplicative_expression
577 {
578 $$ = make_op_node(parser_ctx, AST_OP_PLUS, $1, $3);
579 }
580 | additive_expression MINUS multiplicative_expression
581 {
582 $$ = make_op_node(parser_ctx, AST_OP_MINUS, $1, $3);
583 }
584 ;
585
586shift_expression
587 : additive_expression
588 { $$ = $1; }
589 | shift_expression LEFT_OP additive_expression
590 {
116d3c01 591 $$ = make_op_node(parser_ctx, AST_OP_BIT_LSHIFT, $1, $3);
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592 }
593 | shift_expression RIGHT_OP additive_expression
594 {
116d3c01 595 $$ = make_op_node(parser_ctx, AST_OP_BIT_RSHIFT, $1, $3);
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596 }
597 ;
598
831b702b 599and_expression
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600 : shift_expression
601 { $$ = $1; }
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602 | and_expression AND_BIN shift_expression
603 {
604 $$ = make_op_node(parser_ctx, AST_OP_BIT_AND, $1, $3);
605 }
606 ;
607
608exclusive_or_expression
609 : and_expression
610 { $$ = $1; }
611 | exclusive_or_expression XOR_BIN and_expression
612 {
613 $$ = make_op_node(parser_ctx, AST_OP_BIT_XOR, $1, $3);
614 }
615 ;
616
617inclusive_or_expression
618 : exclusive_or_expression
619 { $$ = $1; }
620 | inclusive_or_expression OR_BIN exclusive_or_expression
621 {
622 $$ = make_op_node(parser_ctx, AST_OP_BIT_OR, $1, $3);
623 }
624 ;
625
626relational_expression
627 : inclusive_or_expression
628 { $$ = $1; }
629 | relational_expression LT_OP inclusive_or_expression
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630 {
631 $$ = make_op_node(parser_ctx, AST_OP_LT, $1, $3);
632 }
831b702b 633 | relational_expression GT_OP inclusive_or_expression
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634 {
635 $$ = make_op_node(parser_ctx, AST_OP_GT, $1, $3);
636 }
831b702b 637 | relational_expression LE_OP inclusive_or_expression
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638 {
639 $$ = make_op_node(parser_ctx, AST_OP_LE, $1, $3);
640 }
831b702b 641 | relational_expression GE_OP inclusive_or_expression
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642 {
643 $$ = make_op_node(parser_ctx, AST_OP_GE, $1, $3);
644 }
645 ;
646
647equality_expression
648 : relational_expression
649 { $$ = $1; }
650 | equality_expression EQ_OP relational_expression
651 {
652 $$ = make_op_node(parser_ctx, AST_OP_EQ, $1, $3);
653 }
654 | equality_expression NE_OP relational_expression
655 {
656 $$ = make_op_node(parser_ctx, AST_OP_NE, $1, $3);
657 }
658 ;
659
953192ba 660logical_and_expression
831b702b 661 : equality_expression
953192ba 662 { $$ = $1; }
831b702b 663 | logical_and_expression AND_OP equality_expression
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664 {
665 $$ = make_op_node(parser_ctx, AST_OP_AND, $1, $3);
666 }
667 ;
668
669logical_or_expression
670 : logical_and_expression
671 { $$ = $1; }
672 | logical_or_expression OR_OP logical_and_expression
673 {
674 $$ = make_op_node(parser_ctx, AST_OP_OR, $1, $3);
675 }
676 ;
677
678expression
679 : logical_or_expression
680 { $$ = $1; }
681 ;
682
683translation_unit
684 : expression
685 {
686 parser_ctx->ast->root.u.root.child = $1;
687 }
688 ;
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