| 1 | /* |
| 2 | * filter-visitor-generate-ir.c |
| 3 | * |
| 4 | * LTTng filter generate intermediate representation |
| 5 | * |
| 6 | * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * SPDX-License-Identifier: LGPL-2.1-only |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <unistd.h> |
| 14 | #include <string.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <inttypes.h> |
| 17 | #include "filter-ast.h" |
| 18 | #include "filter-parser.hpp" |
| 19 | #include "filter-ir.h" |
| 20 | |
| 21 | #include <common/compat/errno.h> |
| 22 | #include <common/macros.h> |
| 23 | #include <common/string-utils/string-utils.h> |
| 24 | |
| 25 | static |
| 26 | struct ir_op *generate_ir_recursive(struct filter_parser_ctx *ctx, |
| 27 | struct filter_node *node, enum ir_side side); |
| 28 | |
| 29 | static |
| 30 | struct ir_op *make_op_root(struct ir_op *child, enum ir_side side) |
| 31 | { |
| 32 | struct ir_op *op; |
| 33 | |
| 34 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 35 | if (!op) |
| 36 | return NULL; |
| 37 | switch (child->data_type) { |
| 38 | case IR_DATA_UNKNOWN: |
| 39 | default: |
| 40 | fprintf(stderr, "[error] Unknown root child data type\n"); |
| 41 | free(op); |
| 42 | return NULL; |
| 43 | case IR_DATA_STRING: |
| 44 | fprintf(stderr, "[error] String cannot be root data type\n"); |
| 45 | free(op); |
| 46 | return NULL; |
| 47 | case IR_DATA_NUMERIC: |
| 48 | case IR_DATA_FIELD_REF: |
| 49 | case IR_DATA_GET_CONTEXT_REF: |
| 50 | case IR_DATA_EXPRESSION: |
| 51 | /* ok */ |
| 52 | break; |
| 53 | } |
| 54 | op->op = IR_OP_ROOT; |
| 55 | op->side = side; |
| 56 | op->data_type = child->data_type; |
| 57 | op->signedness = child->signedness; |
| 58 | op->u.root.child = child; |
| 59 | return op; |
| 60 | } |
| 61 | |
| 62 | static |
| 63 | enum ir_load_string_type get_literal_string_type(const char *string) |
| 64 | { |
| 65 | LTTNG_ASSERT(string); |
| 66 | |
| 67 | if (strutils_is_star_glob_pattern(string)) { |
| 68 | if (strutils_is_star_at_the_end_only_glob_pattern(string)) { |
| 69 | return IR_LOAD_STRING_TYPE_GLOB_STAR_END; |
| 70 | } |
| 71 | |
| 72 | return IR_LOAD_STRING_TYPE_GLOB_STAR; |
| 73 | } |
| 74 | |
| 75 | return IR_LOAD_STRING_TYPE_PLAIN; |
| 76 | } |
| 77 | |
| 78 | static |
| 79 | struct ir_op *make_op_load_string(const char *string, enum ir_side side) |
| 80 | { |
| 81 | struct ir_op *op; |
| 82 | |
| 83 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 84 | if (!op) |
| 85 | return NULL; |
| 86 | op->op = IR_OP_LOAD; |
| 87 | op->data_type = IR_DATA_STRING; |
| 88 | op->signedness = IR_SIGN_UNKNOWN; |
| 89 | op->side = side; |
| 90 | op->u.load.u.string.type = get_literal_string_type(string); |
| 91 | op->u.load.u.string.value = strdup(string); |
| 92 | if (!op->u.load.u.string.value) { |
| 93 | free(op); |
| 94 | return NULL; |
| 95 | } |
| 96 | return op; |
| 97 | } |
| 98 | |
| 99 | static |
| 100 | struct ir_op *make_op_load_numeric(int64_t v, enum ir_side side) |
| 101 | { |
| 102 | struct ir_op *op; |
| 103 | |
| 104 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 105 | if (!op) |
| 106 | return NULL; |
| 107 | op->op = IR_OP_LOAD; |
| 108 | op->data_type = IR_DATA_NUMERIC; |
| 109 | /* TODO: for now, all numeric values are signed */ |
| 110 | op->signedness = IR_SIGNED; |
| 111 | op->side = side; |
| 112 | op->u.load.u.num = v; |
| 113 | return op; |
| 114 | } |
| 115 | |
| 116 | static |
| 117 | struct ir_op *make_op_load_float(double v, enum ir_side side) |
| 118 | { |
| 119 | struct ir_op *op; |
| 120 | |
| 121 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 122 | if (!op) |
| 123 | return NULL; |
| 124 | op->op = IR_OP_LOAD; |
| 125 | op->data_type = IR_DATA_FLOAT; |
| 126 | op->signedness = IR_SIGN_UNKNOWN; |
| 127 | op->side = side; |
| 128 | op->u.load.u.flt = v; |
| 129 | return op; |
| 130 | } |
| 131 | |
| 132 | static |
| 133 | void free_load_expression(struct ir_load_expression *load_expression) |
| 134 | { |
| 135 | struct ir_load_expression_op *exp_op; |
| 136 | |
| 137 | if (!load_expression) |
| 138 | return; |
| 139 | exp_op = load_expression->child; |
| 140 | for (;;) { |
| 141 | struct ir_load_expression_op *prev_exp_op; |
| 142 | |
| 143 | if (!exp_op) |
| 144 | break; |
| 145 | switch (exp_op->type) { |
| 146 | case IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT: |
| 147 | case IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT: |
| 148 | case IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT: |
| 149 | case IR_LOAD_EXPRESSION_GET_INDEX: |
| 150 | case IR_LOAD_EXPRESSION_LOAD_FIELD: |
| 151 | break; |
| 152 | case IR_LOAD_EXPRESSION_GET_SYMBOL: |
| 153 | free(exp_op->u.symbol); |
| 154 | break; |
| 155 | } |
| 156 | prev_exp_op = exp_op; |
| 157 | exp_op = exp_op->next; |
| 158 | free(prev_exp_op); |
| 159 | } |
| 160 | free(load_expression); |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * Returns the first node of the chain, after initializing the next |
| 165 | * pointers. |
| 166 | */ |
| 167 | static |
| 168 | struct filter_node *load_expression_get_forward_chain(struct filter_node *node) |
| 169 | { |
| 170 | struct filter_node *prev_node; |
| 171 | |
| 172 | for (;;) { |
| 173 | LTTNG_ASSERT(node->type == NODE_EXPRESSION); |
| 174 | prev_node = node; |
| 175 | node = node->u.expression.prev; |
| 176 | if (!node) { |
| 177 | break; |
| 178 | } |
| 179 | node->u.expression.next = prev_node; |
| 180 | } |
| 181 | return prev_node; |
| 182 | } |
| 183 | |
| 184 | static |
| 185 | struct ir_load_expression *create_load_expression(struct filter_node *node) |
| 186 | { |
| 187 | struct ir_load_expression *load_exp; |
| 188 | struct ir_load_expression_op *load_exp_op, *prev_op; |
| 189 | const char *str; |
| 190 | |
| 191 | /* Get forward chain. */ |
| 192 | node = load_expression_get_forward_chain(node); |
| 193 | if (!node) |
| 194 | return NULL; |
| 195 | load_exp = (ir_load_expression *) zmalloc(sizeof(struct ir_load_expression)); |
| 196 | if (!load_exp) |
| 197 | return NULL; |
| 198 | |
| 199 | /* Root */ |
| 200 | load_exp_op = (ir_load_expression_op *) zmalloc(sizeof(struct ir_load_expression_op)); |
| 201 | if (!load_exp_op) |
| 202 | goto error; |
| 203 | load_exp->child = load_exp_op; |
| 204 | str = node->u.expression.u.string; |
| 205 | if (!strcmp(str, "$ctx")) { |
| 206 | load_exp_op->type = IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT; |
| 207 | node = node->u.expression.next; |
| 208 | if (!node) { |
| 209 | fprintf(stderr, "[error] Expecting identifier after \'%s\'\n", str); |
| 210 | goto error; |
| 211 | } |
| 212 | str = node->u.expression.u.string; |
| 213 | } else if (!strcmp(str, "$app")) { |
| 214 | load_exp_op->type = IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT; |
| 215 | node = node->u.expression.next; |
| 216 | if (!node) { |
| 217 | fprintf(stderr, "[error] Expecting identifier after \'%s\'\n", str); |
| 218 | goto error; |
| 219 | } |
| 220 | str = node->u.expression.u.string; |
| 221 | } else if (str[0] == '$') { |
| 222 | fprintf(stderr, "[error] Unexpected identifier \'%s\'\n", str); |
| 223 | goto error; |
| 224 | } else { |
| 225 | load_exp_op->type = IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT; |
| 226 | } |
| 227 | |
| 228 | for (;;) { |
| 229 | struct filter_node *bracket_node; |
| 230 | |
| 231 | prev_op = load_exp_op; |
| 232 | load_exp_op = (ir_load_expression_op *) zmalloc(sizeof(struct ir_load_expression_op)); |
| 233 | if (!load_exp_op) |
| 234 | goto error; |
| 235 | prev_op->next = load_exp_op; |
| 236 | load_exp_op->type = IR_LOAD_EXPRESSION_GET_SYMBOL; |
| 237 | load_exp_op->u.symbol = strdup(str); |
| 238 | if (!load_exp_op->u.symbol) |
| 239 | goto error; |
| 240 | |
| 241 | /* Explore brackets from current node. */ |
| 242 | for (bracket_node = node->u.expression.next_bracket; |
| 243 | bracket_node != NULL; |
| 244 | bracket_node = bracket_node->u.expression.next_bracket) { |
| 245 | prev_op = load_exp_op; |
| 246 | if (bracket_node->type != NODE_EXPRESSION || |
| 247 | bracket_node->u.expression.type != AST_EXP_CONSTANT) { |
| 248 | fprintf(stderr, "[error] Expecting constant index in array expression\n"); |
| 249 | goto error; |
| 250 | } |
| 251 | load_exp_op = (ir_load_expression_op *) zmalloc(sizeof(struct ir_load_expression_op)); |
| 252 | if (!load_exp_op) |
| 253 | goto error; |
| 254 | prev_op->next = load_exp_op; |
| 255 | load_exp_op->type = IR_LOAD_EXPRESSION_GET_INDEX; |
| 256 | load_exp_op->u.index = bracket_node->u.expression.u.constant; |
| 257 | } |
| 258 | /* Go to next chain element. */ |
| 259 | node = node->u.expression.next; |
| 260 | if (!node) |
| 261 | break; |
| 262 | str = node->u.expression.u.string; |
| 263 | } |
| 264 | /* Add final load field */ |
| 265 | prev_op = load_exp_op; |
| 266 | load_exp_op = (ir_load_expression_op *) zmalloc(sizeof(struct ir_load_expression_op)); |
| 267 | if (!load_exp_op) |
| 268 | goto error; |
| 269 | prev_op->next = load_exp_op; |
| 270 | load_exp_op->type = IR_LOAD_EXPRESSION_LOAD_FIELD; |
| 271 | return load_exp; |
| 272 | |
| 273 | error: |
| 274 | free_load_expression(load_exp); |
| 275 | return NULL; |
| 276 | } |
| 277 | |
| 278 | static |
| 279 | struct ir_op *make_op_load_expression(struct filter_node *node, |
| 280 | enum ir_side side) |
| 281 | { |
| 282 | struct ir_op *op; |
| 283 | |
| 284 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 285 | if (!op) |
| 286 | return NULL; |
| 287 | op->op = IR_OP_LOAD; |
| 288 | op->data_type = IR_DATA_EXPRESSION; |
| 289 | op->signedness = IR_SIGN_DYN; |
| 290 | op->side = side; |
| 291 | op->u.load.u.expression = create_load_expression(node); |
| 292 | if (!op->u.load.u.expression) { |
| 293 | goto error; |
| 294 | } |
| 295 | return op; |
| 296 | |
| 297 | error: |
| 298 | free_load_expression(op->u.load.u.expression); |
| 299 | free(op); |
| 300 | return NULL; |
| 301 | } |
| 302 | |
| 303 | static |
| 304 | struct ir_op *make_op_unary(enum unary_op_type unary_op_type, |
| 305 | const char *op_str, enum ir_op_signedness signedness, |
| 306 | struct ir_op *child, enum ir_side side) |
| 307 | { |
| 308 | struct ir_op *op = NULL; |
| 309 | |
| 310 | if (child->data_type == IR_DATA_STRING) { |
| 311 | fprintf(stderr, "[error] unary operation '%s' not allowed on string literal\n", op_str); |
| 312 | goto error; |
| 313 | } |
| 314 | |
| 315 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 316 | if (!op) |
| 317 | return NULL; |
| 318 | op->op = IR_OP_UNARY; |
| 319 | op->data_type = child->data_type; |
| 320 | op->signedness = signedness; |
| 321 | op->side = side; |
| 322 | op->u.unary.type = unary_op_type; |
| 323 | op->u.unary.child = child; |
| 324 | return op; |
| 325 | |
| 326 | error: |
| 327 | free(op); |
| 328 | return NULL; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * unary + is pretty much useless. |
| 333 | */ |
| 334 | static |
| 335 | struct ir_op *make_op_unary_plus(struct ir_op *child, enum ir_side side) |
| 336 | { |
| 337 | return make_op_unary(AST_UNARY_PLUS, "+", child->signedness, |
| 338 | child, side); |
| 339 | } |
| 340 | |
| 341 | static |
| 342 | struct ir_op *make_op_unary_minus(struct ir_op *child, enum ir_side side) |
| 343 | { |
| 344 | return make_op_unary(AST_UNARY_MINUS, "-", child->signedness, |
| 345 | child, side); |
| 346 | } |
| 347 | |
| 348 | static |
| 349 | struct ir_op *make_op_unary_not(struct ir_op *child, enum ir_side side) |
| 350 | { |
| 351 | return make_op_unary(AST_UNARY_NOT, "!", child->signedness, |
| 352 | child, side); |
| 353 | } |
| 354 | |
| 355 | static |
| 356 | struct ir_op *make_op_unary_bit_not(struct ir_op *child, enum ir_side side) |
| 357 | { |
| 358 | return make_op_unary(AST_UNARY_BIT_NOT, "~", child->signedness, |
| 359 | child, side); |
| 360 | } |
| 361 | |
| 362 | static |
| 363 | struct ir_op *make_op_binary_compare(enum op_type bin_op_type, |
| 364 | const char *op_str, struct ir_op *left, struct ir_op *right, |
| 365 | enum ir_side side) |
| 366 | { |
| 367 | struct ir_op *op = NULL; |
| 368 | |
| 369 | if (left->data_type == IR_DATA_UNKNOWN |
| 370 | || right->data_type == IR_DATA_UNKNOWN) { |
| 371 | fprintf(stderr, "[error] binary operation '%s' has unknown operand type\n", op_str); |
| 372 | goto error; |
| 373 | |
| 374 | } |
| 375 | if ((left->data_type == IR_DATA_STRING |
| 376 | && (right->data_type == IR_DATA_NUMERIC || right->data_type == IR_DATA_FLOAT)) |
| 377 | || ((left->data_type == IR_DATA_NUMERIC || left->data_type == IR_DATA_FLOAT) && |
| 378 | right->data_type == IR_DATA_STRING)) { |
| 379 | fprintf(stderr, "[error] binary operation '%s' operand type mismatch\n", op_str); |
| 380 | goto error; |
| 381 | } |
| 382 | |
| 383 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 384 | if (!op) |
| 385 | return NULL; |
| 386 | op->op = IR_OP_BINARY; |
| 387 | op->u.binary.type = bin_op_type; |
| 388 | op->u.binary.left = left; |
| 389 | op->u.binary.right = right; |
| 390 | |
| 391 | /* we return a boolean, represented as signed numeric */ |
| 392 | op->data_type = IR_DATA_NUMERIC; |
| 393 | op->signedness = IR_SIGNED; |
| 394 | op->side = side; |
| 395 | |
| 396 | return op; |
| 397 | |
| 398 | error: |
| 399 | free(op); |
| 400 | return NULL; |
| 401 | } |
| 402 | |
| 403 | static |
| 404 | struct ir_op *make_op_binary_eq(struct ir_op *left, struct ir_op *right, |
| 405 | enum ir_side side) |
| 406 | { |
| 407 | return make_op_binary_compare(AST_OP_EQ, "==", left, right, side); |
| 408 | } |
| 409 | |
| 410 | static |
| 411 | struct ir_op *make_op_binary_ne(struct ir_op *left, struct ir_op *right, |
| 412 | enum ir_side side) |
| 413 | { |
| 414 | return make_op_binary_compare(AST_OP_NE, "!=", left, right, side); |
| 415 | } |
| 416 | |
| 417 | static |
| 418 | struct ir_op *make_op_binary_gt(struct ir_op *left, struct ir_op *right, |
| 419 | enum ir_side side) |
| 420 | { |
| 421 | return make_op_binary_compare(AST_OP_GT, ">", left, right, side); |
| 422 | } |
| 423 | |
| 424 | static |
| 425 | struct ir_op *make_op_binary_lt(struct ir_op *left, struct ir_op *right, |
| 426 | enum ir_side side) |
| 427 | { |
| 428 | return make_op_binary_compare(AST_OP_LT, "<", left, right, side); |
| 429 | } |
| 430 | |
| 431 | static |
| 432 | struct ir_op *make_op_binary_ge(struct ir_op *left, struct ir_op *right, |
| 433 | enum ir_side side) |
| 434 | { |
| 435 | return make_op_binary_compare(AST_OP_GE, ">=", left, right, side); |
| 436 | } |
| 437 | |
| 438 | static |
| 439 | struct ir_op *make_op_binary_le(struct ir_op *left, struct ir_op *right, |
| 440 | enum ir_side side) |
| 441 | { |
| 442 | return make_op_binary_compare(AST_OP_LE, "<=", left, right, side); |
| 443 | } |
| 444 | |
| 445 | static |
| 446 | struct ir_op *make_op_binary_logical(enum op_type bin_op_type, |
| 447 | const char *op_str, struct ir_op *left, struct ir_op *right, |
| 448 | enum ir_side side) |
| 449 | { |
| 450 | struct ir_op *op = NULL; |
| 451 | |
| 452 | if (left->data_type == IR_DATA_UNKNOWN |
| 453 | || right->data_type == IR_DATA_UNKNOWN) { |
| 454 | fprintf(stderr, "[error] binary operation '%s' has unknown operand type\n", op_str); |
| 455 | goto error; |
| 456 | |
| 457 | } |
| 458 | if (left->data_type == IR_DATA_STRING |
| 459 | || right->data_type == IR_DATA_STRING) { |
| 460 | fprintf(stderr, "[error] logical binary operation '%s' cannot have string operand\n", op_str); |
| 461 | goto error; |
| 462 | } |
| 463 | |
| 464 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 465 | if (!op) |
| 466 | return NULL; |
| 467 | op->op = IR_OP_LOGICAL; |
| 468 | op->u.binary.type = bin_op_type; |
| 469 | op->u.binary.left = left; |
| 470 | op->u.binary.right = right; |
| 471 | |
| 472 | /* we return a boolean, represented as signed numeric */ |
| 473 | op->data_type = IR_DATA_NUMERIC; |
| 474 | op->signedness = IR_SIGNED; |
| 475 | op->side = side; |
| 476 | |
| 477 | return op; |
| 478 | |
| 479 | error: |
| 480 | free(op); |
| 481 | return NULL; |
| 482 | } |
| 483 | |
| 484 | static |
| 485 | struct ir_op *make_op_binary_bitwise(enum op_type bin_op_type, |
| 486 | const char *op_str, struct ir_op *left, struct ir_op *right, |
| 487 | enum ir_side side) |
| 488 | { |
| 489 | struct ir_op *op = NULL; |
| 490 | |
| 491 | if (left->data_type == IR_DATA_UNKNOWN |
| 492 | || right->data_type == IR_DATA_UNKNOWN) { |
| 493 | fprintf(stderr, "[error] bitwise binary operation '%s' has unknown operand type\n", op_str); |
| 494 | goto error; |
| 495 | |
| 496 | } |
| 497 | if (left->data_type == IR_DATA_STRING |
| 498 | || right->data_type == IR_DATA_STRING) { |
| 499 | fprintf(stderr, "[error] bitwise binary operation '%s' cannot have string operand\n", op_str); |
| 500 | goto error; |
| 501 | } |
| 502 | if (left->data_type == IR_DATA_FLOAT |
| 503 | || right->data_type == IR_DATA_FLOAT) { |
| 504 | fprintf(stderr, "[error] bitwise binary operation '%s' cannot have floating point operand\n", op_str); |
| 505 | goto error; |
| 506 | } |
| 507 | |
| 508 | op = (ir_op *) zmalloc(sizeof(struct ir_op)); |
| 509 | if (!op) |
| 510 | return NULL; |
| 511 | op->op = IR_OP_BINARY; |
| 512 | op->u.binary.type = bin_op_type; |
| 513 | op->u.binary.left = left; |
| 514 | op->u.binary.right = right; |
| 515 | |
| 516 | /* we return a signed numeric */ |
| 517 | op->data_type = IR_DATA_NUMERIC; |
| 518 | op->signedness = IR_SIGNED; |
| 519 | op->side = side; |
| 520 | |
| 521 | return op; |
| 522 | |
| 523 | error: |
| 524 | free(op); |
| 525 | return NULL; |
| 526 | } |
| 527 | |
| 528 | static |
| 529 | struct ir_op *make_op_binary_logical_and(struct ir_op *left, struct ir_op *right, |
| 530 | enum ir_side side) |
| 531 | { |
| 532 | return make_op_binary_logical(AST_OP_AND, "&&", left, right, side); |
| 533 | } |
| 534 | |
| 535 | static |
| 536 | struct ir_op *make_op_binary_logical_or(struct ir_op *left, struct ir_op *right, |
| 537 | enum ir_side side) |
| 538 | { |
| 539 | return make_op_binary_logical(AST_OP_OR, "||", left, right, side); |
| 540 | } |
| 541 | |
| 542 | static |
| 543 | struct ir_op *make_op_binary_bitwise_rshift(struct ir_op *left, struct ir_op *right, |
| 544 | enum ir_side side) |
| 545 | { |
| 546 | return make_op_binary_bitwise(AST_OP_BIT_RSHIFT, ">>", left, right, side); |
| 547 | } |
| 548 | |
| 549 | static |
| 550 | struct ir_op *make_op_binary_bitwise_lshift(struct ir_op *left, struct ir_op *right, |
| 551 | enum ir_side side) |
| 552 | { |
| 553 | return make_op_binary_bitwise(AST_OP_BIT_LSHIFT, "<<", left, right, side); |
| 554 | } |
| 555 | |
| 556 | static |
| 557 | struct ir_op *make_op_binary_bitwise_and(struct ir_op *left, struct ir_op *right, |
| 558 | enum ir_side side) |
| 559 | { |
| 560 | return make_op_binary_bitwise(AST_OP_BIT_AND, "&", left, right, side); |
| 561 | } |
| 562 | |
| 563 | static |
| 564 | struct ir_op *make_op_binary_bitwise_or(struct ir_op *left, struct ir_op *right, |
| 565 | enum ir_side side) |
| 566 | { |
| 567 | return make_op_binary_bitwise(AST_OP_BIT_OR, "|", left, right, side); |
| 568 | } |
| 569 | |
| 570 | static |
| 571 | struct ir_op *make_op_binary_bitwise_xor(struct ir_op *left, struct ir_op *right, |
| 572 | enum ir_side side) |
| 573 | { |
| 574 | return make_op_binary_bitwise(AST_OP_BIT_XOR, "^", left, right, side); |
| 575 | } |
| 576 | |
| 577 | static |
| 578 | void filter_free_ir_recursive(struct ir_op *op) |
| 579 | { |
| 580 | if (!op) |
| 581 | return; |
| 582 | switch (op->op) { |
| 583 | case IR_OP_UNKNOWN: |
| 584 | default: |
| 585 | fprintf(stderr, "[error] Unknown op type in %s\n", |
| 586 | __func__); |
| 587 | break; |
| 588 | case IR_OP_ROOT: |
| 589 | filter_free_ir_recursive(op->u.root.child); |
| 590 | break; |
| 591 | case IR_OP_LOAD: |
| 592 | switch (op->data_type) { |
| 593 | case IR_DATA_STRING: |
| 594 | free(op->u.load.u.string.value); |
| 595 | break; |
| 596 | case IR_DATA_FIELD_REF: /* fall-through */ |
| 597 | case IR_DATA_GET_CONTEXT_REF: |
| 598 | free(op->u.load.u.ref); |
| 599 | break; |
| 600 | case IR_DATA_EXPRESSION: |
| 601 | free_load_expression(op->u.load.u.expression); |
| 602 | default: |
| 603 | break; |
| 604 | } |
| 605 | break; |
| 606 | case IR_OP_UNARY: |
| 607 | filter_free_ir_recursive(op->u.unary.child); |
| 608 | break; |
| 609 | case IR_OP_BINARY: |
| 610 | filter_free_ir_recursive(op->u.binary.left); |
| 611 | filter_free_ir_recursive(op->u.binary.right); |
| 612 | break; |
| 613 | case IR_OP_LOGICAL: |
| 614 | filter_free_ir_recursive(op->u.logical.left); |
| 615 | filter_free_ir_recursive(op->u.logical.right); |
| 616 | break; |
| 617 | } |
| 618 | free(op); |
| 619 | } |
| 620 | |
| 621 | static |
| 622 | struct ir_op *make_expression(struct filter_parser_ctx *ctx, |
| 623 | struct filter_node *node, enum ir_side side) |
| 624 | { |
| 625 | switch (node->u.expression.type) { |
| 626 | case AST_EXP_UNKNOWN: |
| 627 | default: |
| 628 | fprintf(stderr, "[error] %s: unknown expression type\n", __func__); |
| 629 | return NULL; |
| 630 | |
| 631 | case AST_EXP_STRING: |
| 632 | return make_op_load_string(node->u.expression.u.string, side); |
| 633 | case AST_EXP_CONSTANT: |
| 634 | return make_op_load_numeric(node->u.expression.u.constant, |
| 635 | side); |
| 636 | case AST_EXP_FLOAT_CONSTANT: |
| 637 | return make_op_load_float(node->u.expression.u.float_constant, |
| 638 | side); |
| 639 | case AST_EXP_IDENTIFIER: |
| 640 | case AST_EXP_GLOBAL_IDENTIFIER: |
| 641 | return make_op_load_expression(node, side); |
| 642 | case AST_EXP_NESTED: |
| 643 | return generate_ir_recursive(ctx, node->u.expression.u.child, |
| 644 | side); |
| 645 | } |
| 646 | } |
| 647 | |
| 648 | static |
| 649 | struct ir_op *make_op(struct filter_parser_ctx *ctx, |
| 650 | struct filter_node *node, enum ir_side side) |
| 651 | { |
| 652 | struct ir_op *op = NULL, *lchild, *rchild; |
| 653 | const char *op_str = "?"; |
| 654 | |
| 655 | switch (node->u.op.type) { |
| 656 | case AST_OP_UNKNOWN: |
| 657 | default: |
| 658 | fprintf(stderr, "[error] %s: unknown binary op type\n", __func__); |
| 659 | return NULL; |
| 660 | |
| 661 | /* |
| 662 | * The following binary operators other than comparators and |
| 663 | * logical and/or are not supported yet. |
| 664 | */ |
| 665 | case AST_OP_MUL: |
| 666 | op_str = "*"; |
| 667 | goto error_not_supported; |
| 668 | case AST_OP_DIV: |
| 669 | op_str = "/"; |
| 670 | goto error_not_supported; |
| 671 | case AST_OP_MOD: |
| 672 | op_str = "%"; |
| 673 | goto error_not_supported; |
| 674 | case AST_OP_PLUS: |
| 675 | op_str = "+"; |
| 676 | goto error_not_supported; |
| 677 | case AST_OP_MINUS: |
| 678 | op_str = "-"; |
| 679 | goto error_not_supported; |
| 680 | |
| 681 | case AST_OP_BIT_RSHIFT: |
| 682 | case AST_OP_BIT_LSHIFT: |
| 683 | case AST_OP_BIT_AND: |
| 684 | case AST_OP_BIT_OR: |
| 685 | case AST_OP_BIT_XOR: |
| 686 | lchild = generate_ir_recursive(ctx, node->u.op.lchild, IR_LEFT); |
| 687 | if (!lchild) |
| 688 | return NULL; |
| 689 | rchild = generate_ir_recursive(ctx, node->u.op.rchild, IR_RIGHT); |
| 690 | if (!rchild) { |
| 691 | filter_free_ir_recursive(lchild); |
| 692 | return NULL; |
| 693 | } |
| 694 | break; |
| 695 | |
| 696 | case AST_OP_EQ: |
| 697 | case AST_OP_NE: |
| 698 | case AST_OP_GT: |
| 699 | case AST_OP_LT: |
| 700 | case AST_OP_GE: |
| 701 | case AST_OP_LE: |
| 702 | lchild = generate_ir_recursive(ctx, node->u.op.lchild, IR_LEFT); |
| 703 | if (!lchild) |
| 704 | return NULL; |
| 705 | rchild = generate_ir_recursive(ctx, node->u.op.rchild, IR_RIGHT); |
| 706 | if (!rchild) { |
| 707 | filter_free_ir_recursive(lchild); |
| 708 | return NULL; |
| 709 | } |
| 710 | break; |
| 711 | |
| 712 | case AST_OP_AND: |
| 713 | case AST_OP_OR: |
| 714 | /* |
| 715 | * Both children considered as left, since we need to |
| 716 | * populate R0. |
| 717 | */ |
| 718 | lchild = generate_ir_recursive(ctx, node->u.op.lchild, IR_LEFT); |
| 719 | if (!lchild) |
| 720 | return NULL; |
| 721 | rchild = generate_ir_recursive(ctx, node->u.op.rchild, IR_LEFT); |
| 722 | if (!rchild) { |
| 723 | filter_free_ir_recursive(lchild); |
| 724 | return NULL; |
| 725 | } |
| 726 | break; |
| 727 | } |
| 728 | |
| 729 | switch (node->u.op.type) { |
| 730 | case AST_OP_AND: |
| 731 | op = make_op_binary_logical_and(lchild, rchild, side); |
| 732 | break; |
| 733 | case AST_OP_OR: |
| 734 | op = make_op_binary_logical_or(lchild, rchild, side); |
| 735 | break; |
| 736 | case AST_OP_EQ: |
| 737 | op = make_op_binary_eq(lchild, rchild, side); |
| 738 | break; |
| 739 | case AST_OP_NE: |
| 740 | op = make_op_binary_ne(lchild, rchild, side); |
| 741 | break; |
| 742 | case AST_OP_GT: |
| 743 | op = make_op_binary_gt(lchild, rchild, side); |
| 744 | break; |
| 745 | case AST_OP_LT: |
| 746 | op = make_op_binary_lt(lchild, rchild, side); |
| 747 | break; |
| 748 | case AST_OP_GE: |
| 749 | op = make_op_binary_ge(lchild, rchild, side); |
| 750 | break; |
| 751 | case AST_OP_LE: |
| 752 | op = make_op_binary_le(lchild, rchild, side); |
| 753 | break; |
| 754 | case AST_OP_BIT_RSHIFT: |
| 755 | op = make_op_binary_bitwise_rshift(lchild, rchild, side); |
| 756 | break; |
| 757 | case AST_OP_BIT_LSHIFT: |
| 758 | op = make_op_binary_bitwise_lshift(lchild, rchild, side); |
| 759 | break; |
| 760 | case AST_OP_BIT_AND: |
| 761 | op = make_op_binary_bitwise_and(lchild, rchild, side); |
| 762 | break; |
| 763 | case AST_OP_BIT_OR: |
| 764 | op = make_op_binary_bitwise_or(lchild, rchild, side); |
| 765 | break; |
| 766 | case AST_OP_BIT_XOR: |
| 767 | op = make_op_binary_bitwise_xor(lchild, rchild, side); |
| 768 | break; |
| 769 | default: |
| 770 | break; |
| 771 | } |
| 772 | |
| 773 | if (!op) { |
| 774 | filter_free_ir_recursive(rchild); |
| 775 | filter_free_ir_recursive(lchild); |
| 776 | } |
| 777 | return op; |
| 778 | |
| 779 | error_not_supported: |
| 780 | fprintf(stderr, "[error] %s: binary operation '%s' not supported\n", |
| 781 | __func__, op_str); |
| 782 | return NULL; |
| 783 | } |
| 784 | |
| 785 | static |
| 786 | struct ir_op *make_unary_op(struct filter_parser_ctx *ctx, |
| 787 | struct filter_node *node, enum ir_side side) |
| 788 | { |
| 789 | switch (node->u.unary_op.type) { |
| 790 | case AST_UNARY_UNKNOWN: |
| 791 | default: |
| 792 | fprintf(stderr, "[error] %s: unknown unary op type\n", __func__); |
| 793 | return NULL; |
| 794 | |
| 795 | case AST_UNARY_PLUS: |
| 796 | { |
| 797 | struct ir_op *op, *child; |
| 798 | |
| 799 | child = generate_ir_recursive(ctx, node->u.unary_op.child, |
| 800 | side); |
| 801 | if (!child) |
| 802 | return NULL; |
| 803 | op = make_op_unary_plus(child, side); |
| 804 | if (!op) { |
| 805 | filter_free_ir_recursive(child); |
| 806 | return NULL; |
| 807 | } |
| 808 | return op; |
| 809 | } |
| 810 | case AST_UNARY_MINUS: |
| 811 | { |
| 812 | struct ir_op *op, *child; |
| 813 | |
| 814 | child = generate_ir_recursive(ctx, node->u.unary_op.child, |
| 815 | side); |
| 816 | if (!child) |
| 817 | return NULL; |
| 818 | op = make_op_unary_minus(child, side); |
| 819 | if (!op) { |
| 820 | filter_free_ir_recursive(child); |
| 821 | return NULL; |
| 822 | } |
| 823 | return op; |
| 824 | } |
| 825 | case AST_UNARY_NOT: |
| 826 | { |
| 827 | struct ir_op *op, *child; |
| 828 | |
| 829 | child = generate_ir_recursive(ctx, node->u.unary_op.child, |
| 830 | side); |
| 831 | if (!child) |
| 832 | return NULL; |
| 833 | op = make_op_unary_not(child, side); |
| 834 | if (!op) { |
| 835 | filter_free_ir_recursive(child); |
| 836 | return NULL; |
| 837 | } |
| 838 | return op; |
| 839 | } |
| 840 | case AST_UNARY_BIT_NOT: |
| 841 | { |
| 842 | struct ir_op *op, *child; |
| 843 | |
| 844 | child = generate_ir_recursive(ctx, node->u.unary_op.child, |
| 845 | side); |
| 846 | if (!child) |
| 847 | return NULL; |
| 848 | op = make_op_unary_bit_not(child, side); |
| 849 | if (!op) { |
| 850 | filter_free_ir_recursive(child); |
| 851 | return NULL; |
| 852 | } |
| 853 | return op; |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | return NULL; |
| 858 | } |
| 859 | |
| 860 | static |
| 861 | struct ir_op *generate_ir_recursive(struct filter_parser_ctx *ctx, |
| 862 | struct filter_node *node, enum ir_side side) |
| 863 | { |
| 864 | switch (node->type) { |
| 865 | case NODE_UNKNOWN: |
| 866 | default: |
| 867 | fprintf(stderr, "[error] %s: unknown node type\n", __func__); |
| 868 | return NULL; |
| 869 | |
| 870 | case NODE_ROOT: |
| 871 | { |
| 872 | struct ir_op *op, *child; |
| 873 | |
| 874 | child = generate_ir_recursive(ctx, node->u.root.child, |
| 875 | side); |
| 876 | if (!child) |
| 877 | return NULL; |
| 878 | op = make_op_root(child, side); |
| 879 | if (!op) { |
| 880 | filter_free_ir_recursive(child); |
| 881 | return NULL; |
| 882 | } |
| 883 | return op; |
| 884 | } |
| 885 | case NODE_EXPRESSION: |
| 886 | return make_expression(ctx, node, side); |
| 887 | case NODE_OP: |
| 888 | return make_op(ctx, node, side); |
| 889 | case NODE_UNARY_OP: |
| 890 | return make_unary_op(ctx, node, side); |
| 891 | } |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | void filter_ir_free(struct filter_parser_ctx *ctx) |
| 896 | { |
| 897 | filter_free_ir_recursive(ctx->ir_root); |
| 898 | ctx->ir_root = NULL; |
| 899 | } |
| 900 | |
| 901 | int filter_visitor_ir_generate(struct filter_parser_ctx *ctx) |
| 902 | { |
| 903 | struct ir_op *op; |
| 904 | |
| 905 | op = generate_ir_recursive(ctx, &ctx->ast->root, IR_LEFT); |
| 906 | if (!op) { |
| 907 | return -EINVAL; |
| 908 | } |
| 909 | ctx->ir_root = op; |
| 910 | return 0; |
| 911 | } |