| 1 | /* |
| 2 | * lttng-filter-specialize.c |
| 3 | * |
| 4 | * LTTng modules filter code specializer. |
| 5 | * |
| 6 | * Copyright (C) 2010-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * This library is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; only |
| 11 | * version 2.1 of the License. |
| 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 |
| 19 | * License along with this library; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include "lttng-filter.h" |
| 24 | |
| 25 | int lttng_filter_specialize_bytecode(struct bytecode_runtime *bytecode) |
| 26 | { |
| 27 | void *pc, *next_pc, *start_pc; |
| 28 | int ret = -EINVAL; |
| 29 | struct vstack _stack; |
| 30 | struct vstack *stack = &_stack; |
| 31 | |
| 32 | vstack_init(stack); |
| 33 | |
| 34 | start_pc = &bytecode->data[0]; |
| 35 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 36 | pc = next_pc) { |
| 37 | switch (*(filter_opcode_t *) pc) { |
| 38 | case FILTER_OP_UNKNOWN: |
| 39 | default: |
| 40 | printk(KERN_WARNING "unknown bytecode op %u\n", |
| 41 | (unsigned int) *(filter_opcode_t *) pc); |
| 42 | ret = -EINVAL; |
| 43 | goto end; |
| 44 | |
| 45 | case FILTER_OP_RETURN: |
| 46 | ret = 0; |
| 47 | goto end; |
| 48 | |
| 49 | /* binary */ |
| 50 | case FILTER_OP_MUL: |
| 51 | case FILTER_OP_DIV: |
| 52 | case FILTER_OP_MOD: |
| 53 | case FILTER_OP_PLUS: |
| 54 | case FILTER_OP_MINUS: |
| 55 | case FILTER_OP_RSHIFT: |
| 56 | case FILTER_OP_LSHIFT: |
| 57 | case FILTER_OP_BIN_AND: |
| 58 | case FILTER_OP_BIN_OR: |
| 59 | case FILTER_OP_BIN_XOR: |
| 60 | printk(KERN_WARNING "unsupported bytecode op %u\n", |
| 61 | (unsigned int) *(filter_opcode_t *) pc); |
| 62 | ret = -EINVAL; |
| 63 | goto end; |
| 64 | |
| 65 | case FILTER_OP_EQ: |
| 66 | { |
| 67 | struct binary_op *insn = (struct binary_op *) pc; |
| 68 | |
| 69 | switch(vstack_ax(stack)->type) { |
| 70 | default: |
| 71 | printk(KERN_WARNING "unknown register type\n"); |
| 72 | ret = -EINVAL; |
| 73 | goto end; |
| 74 | |
| 75 | case REG_STRING: |
| 76 | insn->op = FILTER_OP_EQ_STRING; |
| 77 | break; |
| 78 | case REG_S64: |
| 79 | if (vstack_bx(stack)->type == REG_S64) |
| 80 | insn->op = FILTER_OP_EQ_S64; |
| 81 | else |
| 82 | insn->op = FILTER_OP_EQ_DOUBLE_S64; |
| 83 | break; |
| 84 | case REG_DOUBLE: |
| 85 | if (vstack_bx(stack)->type == REG_S64) |
| 86 | insn->op = FILTER_OP_EQ_S64_DOUBLE; |
| 87 | else |
| 88 | insn->op = FILTER_OP_EQ_DOUBLE; |
| 89 | break; |
| 90 | } |
| 91 | /* Pop 2, push 1 */ |
| 92 | if (vstack_pop(stack)) { |
| 93 | ret = -EINVAL; |
| 94 | goto end; |
| 95 | } |
| 96 | vstack_ax(stack)->type = REG_S64; |
| 97 | next_pc += sizeof(struct binary_op); |
| 98 | break; |
| 99 | } |
| 100 | |
| 101 | case FILTER_OP_NE: |
| 102 | { |
| 103 | struct binary_op *insn = (struct binary_op *) pc; |
| 104 | |
| 105 | switch(vstack_ax(stack)->type) { |
| 106 | default: |
| 107 | printk(KERN_WARNING "unknown register type\n"); |
| 108 | ret = -EINVAL; |
| 109 | goto end; |
| 110 | |
| 111 | case REG_STRING: |
| 112 | insn->op = FILTER_OP_NE_STRING; |
| 113 | break; |
| 114 | case REG_S64: |
| 115 | if (vstack_bx(stack)->type == REG_S64) |
| 116 | insn->op = FILTER_OP_NE_S64; |
| 117 | else |
| 118 | insn->op = FILTER_OP_NE_DOUBLE_S64; |
| 119 | break; |
| 120 | case REG_DOUBLE: |
| 121 | if (vstack_bx(stack)->type == REG_S64) |
| 122 | insn->op = FILTER_OP_NE_S64_DOUBLE; |
| 123 | else |
| 124 | insn->op = FILTER_OP_NE_DOUBLE; |
| 125 | break; |
| 126 | } |
| 127 | /* Pop 2, push 1 */ |
| 128 | if (vstack_pop(stack)) { |
| 129 | ret = -EINVAL; |
| 130 | goto end; |
| 131 | } |
| 132 | vstack_ax(stack)->type = REG_S64; |
| 133 | next_pc += sizeof(struct binary_op); |
| 134 | break; |
| 135 | } |
| 136 | |
| 137 | case FILTER_OP_GT: |
| 138 | { |
| 139 | struct binary_op *insn = (struct binary_op *) pc; |
| 140 | |
| 141 | switch(vstack_ax(stack)->type) { |
| 142 | default: |
| 143 | printk(KERN_WARNING "unknown register type\n"); |
| 144 | ret = -EINVAL; |
| 145 | goto end; |
| 146 | |
| 147 | case REG_STRING: |
| 148 | insn->op = FILTER_OP_GT_STRING; |
| 149 | break; |
| 150 | case REG_S64: |
| 151 | if (vstack_bx(stack)->type == REG_S64) |
| 152 | insn->op = FILTER_OP_GT_S64; |
| 153 | else |
| 154 | insn->op = FILTER_OP_GT_DOUBLE_S64; |
| 155 | break; |
| 156 | case REG_DOUBLE: |
| 157 | if (vstack_bx(stack)->type == REG_S64) |
| 158 | insn->op = FILTER_OP_GT_S64_DOUBLE; |
| 159 | else |
| 160 | insn->op = FILTER_OP_GT_DOUBLE; |
| 161 | break; |
| 162 | } |
| 163 | /* Pop 2, push 1 */ |
| 164 | if (vstack_pop(stack)) { |
| 165 | ret = -EINVAL; |
| 166 | goto end; |
| 167 | } |
| 168 | vstack_ax(stack)->type = REG_S64; |
| 169 | next_pc += sizeof(struct binary_op); |
| 170 | break; |
| 171 | } |
| 172 | |
| 173 | case FILTER_OP_LT: |
| 174 | { |
| 175 | struct binary_op *insn = (struct binary_op *) pc; |
| 176 | |
| 177 | switch(vstack_ax(stack)->type) { |
| 178 | default: |
| 179 | printk(KERN_WARNING "unknown register type\n"); |
| 180 | ret = -EINVAL; |
| 181 | goto end; |
| 182 | |
| 183 | case REG_STRING: |
| 184 | insn->op = FILTER_OP_LT_STRING; |
| 185 | break; |
| 186 | case REG_S64: |
| 187 | if (vstack_bx(stack)->type == REG_S64) |
| 188 | insn->op = FILTER_OP_LT_S64; |
| 189 | else |
| 190 | insn->op = FILTER_OP_LT_DOUBLE_S64; |
| 191 | break; |
| 192 | case REG_DOUBLE: |
| 193 | if (vstack_bx(stack)->type == REG_S64) |
| 194 | insn->op = FILTER_OP_LT_S64_DOUBLE; |
| 195 | else |
| 196 | insn->op = FILTER_OP_LT_DOUBLE; |
| 197 | break; |
| 198 | } |
| 199 | /* Pop 2, push 1 */ |
| 200 | if (vstack_pop(stack)) { |
| 201 | ret = -EINVAL; |
| 202 | goto end; |
| 203 | } |
| 204 | vstack_ax(stack)->type = REG_S64; |
| 205 | next_pc += sizeof(struct binary_op); |
| 206 | break; |
| 207 | } |
| 208 | |
| 209 | case FILTER_OP_GE: |
| 210 | { |
| 211 | struct binary_op *insn = (struct binary_op *) pc; |
| 212 | |
| 213 | switch(vstack_ax(stack)->type) { |
| 214 | default: |
| 215 | printk(KERN_WARNING "unknown register type\n"); |
| 216 | ret = -EINVAL; |
| 217 | goto end; |
| 218 | |
| 219 | case REG_STRING: |
| 220 | insn->op = FILTER_OP_GE_STRING; |
| 221 | break; |
| 222 | case REG_S64: |
| 223 | if (vstack_bx(stack)->type == REG_S64) |
| 224 | insn->op = FILTER_OP_GE_S64; |
| 225 | else |
| 226 | insn->op = FILTER_OP_GE_DOUBLE_S64; |
| 227 | break; |
| 228 | case REG_DOUBLE: |
| 229 | if (vstack_bx(stack)->type == REG_S64) |
| 230 | insn->op = FILTER_OP_GE_S64_DOUBLE; |
| 231 | else |
| 232 | insn->op = FILTER_OP_GE_DOUBLE; |
| 233 | break; |
| 234 | } |
| 235 | /* Pop 2, push 1 */ |
| 236 | if (vstack_pop(stack)) { |
| 237 | ret = -EINVAL; |
| 238 | goto end; |
| 239 | } |
| 240 | vstack_ax(stack)->type = REG_S64; |
| 241 | next_pc += sizeof(struct binary_op); |
| 242 | break; |
| 243 | } |
| 244 | case FILTER_OP_LE: |
| 245 | { |
| 246 | struct binary_op *insn = (struct binary_op *) pc; |
| 247 | |
| 248 | switch(vstack_ax(stack)->type) { |
| 249 | default: |
| 250 | printk(KERN_WARNING "unknown register type\n"); |
| 251 | ret = -EINVAL; |
| 252 | goto end; |
| 253 | |
| 254 | case REG_STRING: |
| 255 | insn->op = FILTER_OP_LE_STRING; |
| 256 | break; |
| 257 | case REG_S64: |
| 258 | if (vstack_bx(stack)->type == REG_S64) |
| 259 | insn->op = FILTER_OP_LE_S64; |
| 260 | else |
| 261 | insn->op = FILTER_OP_LE_DOUBLE_S64; |
| 262 | break; |
| 263 | case REG_DOUBLE: |
| 264 | if (vstack_bx(stack)->type == REG_S64) |
| 265 | insn->op = FILTER_OP_LE_S64_DOUBLE; |
| 266 | else |
| 267 | insn->op = FILTER_OP_LE_DOUBLE; |
| 268 | break; |
| 269 | } |
| 270 | vstack_ax(stack)->type = REG_S64; |
| 271 | next_pc += sizeof(struct binary_op); |
| 272 | break; |
| 273 | } |
| 274 | |
| 275 | case FILTER_OP_EQ_STRING: |
| 276 | case FILTER_OP_NE_STRING: |
| 277 | case FILTER_OP_GT_STRING: |
| 278 | case FILTER_OP_LT_STRING: |
| 279 | case FILTER_OP_GE_STRING: |
| 280 | case FILTER_OP_LE_STRING: |
| 281 | case FILTER_OP_EQ_S64: |
| 282 | case FILTER_OP_NE_S64: |
| 283 | case FILTER_OP_GT_S64: |
| 284 | case FILTER_OP_LT_S64: |
| 285 | case FILTER_OP_GE_S64: |
| 286 | case FILTER_OP_LE_S64: |
| 287 | case FILTER_OP_EQ_DOUBLE: |
| 288 | case FILTER_OP_NE_DOUBLE: |
| 289 | case FILTER_OP_GT_DOUBLE: |
| 290 | case FILTER_OP_LT_DOUBLE: |
| 291 | case FILTER_OP_GE_DOUBLE: |
| 292 | case FILTER_OP_LE_DOUBLE: |
| 293 | case FILTER_OP_EQ_DOUBLE_S64: |
| 294 | case FILTER_OP_NE_DOUBLE_S64: |
| 295 | case FILTER_OP_GT_DOUBLE_S64: |
| 296 | case FILTER_OP_LT_DOUBLE_S64: |
| 297 | case FILTER_OP_GE_DOUBLE_S64: |
| 298 | case FILTER_OP_LE_DOUBLE_S64: |
| 299 | case FILTER_OP_EQ_S64_DOUBLE: |
| 300 | case FILTER_OP_NE_S64_DOUBLE: |
| 301 | case FILTER_OP_GT_S64_DOUBLE: |
| 302 | case FILTER_OP_LT_S64_DOUBLE: |
| 303 | case FILTER_OP_GE_S64_DOUBLE: |
| 304 | case FILTER_OP_LE_S64_DOUBLE: |
| 305 | { |
| 306 | /* Pop 2, push 1 */ |
| 307 | if (vstack_pop(stack)) { |
| 308 | ret = -EINVAL; |
| 309 | goto end; |
| 310 | } |
| 311 | vstack_ax(stack)->type = REG_S64; |
| 312 | next_pc += sizeof(struct binary_op); |
| 313 | break; |
| 314 | } |
| 315 | |
| 316 | /* unary */ |
| 317 | case FILTER_OP_UNARY_PLUS: |
| 318 | { |
| 319 | struct unary_op *insn = (struct unary_op *) pc; |
| 320 | |
| 321 | switch(vstack_ax(stack)->type) { |
| 322 | default: |
| 323 | printk(KERN_WARNING "unknown register type\n"); |
| 324 | ret = -EINVAL; |
| 325 | goto end; |
| 326 | |
| 327 | case REG_S64: |
| 328 | insn->op = FILTER_OP_UNARY_PLUS_S64; |
| 329 | break; |
| 330 | case REG_DOUBLE: |
| 331 | insn->op = FILTER_OP_UNARY_PLUS_DOUBLE; |
| 332 | break; |
| 333 | } |
| 334 | /* Pop 1, push 1 */ |
| 335 | next_pc += sizeof(struct unary_op); |
| 336 | break; |
| 337 | } |
| 338 | |
| 339 | case FILTER_OP_UNARY_MINUS: |
| 340 | { |
| 341 | struct unary_op *insn = (struct unary_op *) pc; |
| 342 | |
| 343 | switch(vstack_ax(stack)->type) { |
| 344 | default: |
| 345 | printk(KERN_WARNING "unknown register type\n"); |
| 346 | ret = -EINVAL; |
| 347 | goto end; |
| 348 | |
| 349 | case REG_S64: |
| 350 | insn->op = FILTER_OP_UNARY_MINUS_S64; |
| 351 | break; |
| 352 | case REG_DOUBLE: |
| 353 | insn->op = FILTER_OP_UNARY_MINUS_DOUBLE; |
| 354 | break; |
| 355 | } |
| 356 | /* Pop 1, push 1 */ |
| 357 | next_pc += sizeof(struct unary_op); |
| 358 | break; |
| 359 | } |
| 360 | |
| 361 | case FILTER_OP_UNARY_NOT: |
| 362 | { |
| 363 | struct unary_op *insn = (struct unary_op *) pc; |
| 364 | |
| 365 | switch(vstack_ax(stack)->type) { |
| 366 | default: |
| 367 | printk(KERN_WARNING "unknown register type\n"); |
| 368 | ret = -EINVAL; |
| 369 | goto end; |
| 370 | |
| 371 | case REG_S64: |
| 372 | insn->op = FILTER_OP_UNARY_NOT_S64; |
| 373 | break; |
| 374 | case REG_DOUBLE: |
| 375 | insn->op = FILTER_OP_UNARY_NOT_DOUBLE; |
| 376 | break; |
| 377 | } |
| 378 | /* Pop 1, push 1 */ |
| 379 | next_pc += sizeof(struct unary_op); |
| 380 | break; |
| 381 | } |
| 382 | |
| 383 | case FILTER_OP_UNARY_PLUS_S64: |
| 384 | case FILTER_OP_UNARY_MINUS_S64: |
| 385 | case FILTER_OP_UNARY_NOT_S64: |
| 386 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 387 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 388 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 389 | { |
| 390 | /* Pop 1, push 1 */ |
| 391 | next_pc += sizeof(struct unary_op); |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | /* logical */ |
| 396 | case FILTER_OP_AND: |
| 397 | case FILTER_OP_OR: |
| 398 | { |
| 399 | /* Continue to next instruction */ |
| 400 | /* Pop 1 when jump not taken */ |
| 401 | if (vstack_pop(stack)) { |
| 402 | ret = -EINVAL; |
| 403 | goto end; |
| 404 | } |
| 405 | next_pc += sizeof(struct logical_op); |
| 406 | break; |
| 407 | } |
| 408 | |
| 409 | /* load field ref */ |
| 410 | case FILTER_OP_LOAD_FIELD_REF: |
| 411 | { |
| 412 | printk(KERN_WARNING "Unknown field ref type\n"); |
| 413 | ret = -EINVAL; |
| 414 | goto end; |
| 415 | } |
| 416 | /* get context ref */ |
| 417 | case FILTER_OP_GET_CONTEXT_REF: |
| 418 | { |
| 419 | printk(KERN_WARNING "Unknown get context ref type\n"); |
| 420 | ret = -EINVAL; |
| 421 | goto end; |
| 422 | } |
| 423 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 424 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 425 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 426 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
| 427 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: |
| 428 | { |
| 429 | if (vstack_push(stack)) { |
| 430 | ret = -EINVAL; |
| 431 | goto end; |
| 432 | } |
| 433 | vstack_ax(stack)->type = REG_STRING; |
| 434 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 435 | break; |
| 436 | } |
| 437 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 438 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 439 | { |
| 440 | if (vstack_push(stack)) { |
| 441 | ret = -EINVAL; |
| 442 | goto end; |
| 443 | } |
| 444 | vstack_ax(stack)->type = REG_S64; |
| 445 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 446 | break; |
| 447 | } |
| 448 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 449 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 450 | { |
| 451 | if (vstack_push(stack)) { |
| 452 | ret = -EINVAL; |
| 453 | goto end; |
| 454 | } |
| 455 | vstack_ax(stack)->type = REG_DOUBLE; |
| 456 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 457 | break; |
| 458 | } |
| 459 | |
| 460 | /* load from immediate operand */ |
| 461 | case FILTER_OP_LOAD_STRING: |
| 462 | { |
| 463 | struct load_op *insn = (struct load_op *) pc; |
| 464 | |
| 465 | if (vstack_push(stack)) { |
| 466 | ret = -EINVAL; |
| 467 | goto end; |
| 468 | } |
| 469 | vstack_ax(stack)->type = REG_STRING; |
| 470 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 471 | break; |
| 472 | } |
| 473 | |
| 474 | case FILTER_OP_LOAD_S64: |
| 475 | { |
| 476 | if (vstack_push(stack)) { |
| 477 | ret = -EINVAL; |
| 478 | goto end; |
| 479 | } |
| 480 | vstack_ax(stack)->type = REG_S64; |
| 481 | next_pc += sizeof(struct load_op) |
| 482 | + sizeof(struct literal_numeric); |
| 483 | break; |
| 484 | } |
| 485 | |
| 486 | case FILTER_OP_LOAD_DOUBLE: |
| 487 | { |
| 488 | if (vstack_push(stack)) { |
| 489 | ret = -EINVAL; |
| 490 | goto end; |
| 491 | } |
| 492 | vstack_ax(stack)->type = REG_DOUBLE; |
| 493 | next_pc += sizeof(struct load_op) |
| 494 | + sizeof(struct literal_double); |
| 495 | break; |
| 496 | } |
| 497 | |
| 498 | /* cast */ |
| 499 | case FILTER_OP_CAST_TO_S64: |
| 500 | { |
| 501 | struct cast_op *insn = (struct cast_op *) pc; |
| 502 | |
| 503 | switch (vstack_ax(stack)->type) { |
| 504 | default: |
| 505 | printk(KERN_WARNING "unknown register type\n"); |
| 506 | ret = -EINVAL; |
| 507 | goto end; |
| 508 | |
| 509 | case REG_STRING: |
| 510 | printk(KERN_WARNING "Cast op can only be applied to numeric or floating point registers\n"); |
| 511 | ret = -EINVAL; |
| 512 | goto end; |
| 513 | case REG_S64: |
| 514 | insn->op = FILTER_OP_CAST_NOP; |
| 515 | break; |
| 516 | case REG_DOUBLE: |
| 517 | insn->op = FILTER_OP_CAST_DOUBLE_TO_S64; |
| 518 | break; |
| 519 | } |
| 520 | /* Pop 1, push 1 */ |
| 521 | vstack_ax(stack)->type = REG_S64; |
| 522 | next_pc += sizeof(struct cast_op); |
| 523 | break; |
| 524 | } |
| 525 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 526 | { |
| 527 | /* Pop 1, push 1 */ |
| 528 | vstack_ax(stack)->type = REG_S64; |
| 529 | next_pc += sizeof(struct cast_op); |
| 530 | break; |
| 531 | } |
| 532 | case FILTER_OP_CAST_NOP: |
| 533 | { |
| 534 | next_pc += sizeof(struct cast_op); |
| 535 | break; |
| 536 | } |
| 537 | |
| 538 | } |
| 539 | } |
| 540 | end: |
| 541 | return ret; |
| 542 | } |