| 1 | /* |
| 2 | * lttng-filter-specialize.c |
| 3 | * |
| 4 | * LTTng UST filter code specializer. |
| 5 | * |
| 6 | * Copyright (C) 2010-2012 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 vreg reg[NR_REG]; |
| 30 | int i; |
| 31 | |
| 32 | for (i = 0; i < NR_REG; i++) { |
| 33 | reg[i].type = REG_TYPE_UNKNOWN; |
| 34 | reg[i].literal = 0; |
| 35 | } |
| 36 | |
| 37 | start_pc = &bytecode->data[0]; |
| 38 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 39 | pc = next_pc) { |
| 40 | switch (*(filter_opcode_t *) pc) { |
| 41 | case FILTER_OP_UNKNOWN: |
| 42 | default: |
| 43 | ERR("unknown bytecode op %u\n", |
| 44 | (unsigned int) *(filter_opcode_t *) pc); |
| 45 | ret = -EINVAL; |
| 46 | goto end; |
| 47 | |
| 48 | case FILTER_OP_RETURN: |
| 49 | ret = 0; |
| 50 | goto end; |
| 51 | |
| 52 | /* binary */ |
| 53 | case FILTER_OP_MUL: |
| 54 | case FILTER_OP_DIV: |
| 55 | case FILTER_OP_MOD: |
| 56 | case FILTER_OP_PLUS: |
| 57 | case FILTER_OP_MINUS: |
| 58 | case FILTER_OP_RSHIFT: |
| 59 | case FILTER_OP_LSHIFT: |
| 60 | case FILTER_OP_BIN_AND: |
| 61 | case FILTER_OP_BIN_OR: |
| 62 | case FILTER_OP_BIN_XOR: |
| 63 | ERR("unsupported bytecode op %u\n", |
| 64 | (unsigned int) *(filter_opcode_t *) pc); |
| 65 | ret = -EINVAL; |
| 66 | goto end; |
| 67 | |
| 68 | case FILTER_OP_EQ: |
| 69 | { |
| 70 | struct binary_op *insn = (struct binary_op *) pc; |
| 71 | |
| 72 | switch(reg[REG_R0].type) { |
| 73 | default: |
| 74 | ERR("unknown register type\n"); |
| 75 | ret = -EINVAL; |
| 76 | goto end; |
| 77 | |
| 78 | case REG_STRING: |
| 79 | insn->op = FILTER_OP_EQ_STRING; |
| 80 | break; |
| 81 | case REG_S64: |
| 82 | if (reg[REG_R1].type == REG_S64) |
| 83 | insn->op = FILTER_OP_EQ_S64; |
| 84 | else |
| 85 | insn->op = FILTER_OP_EQ_DOUBLE; |
| 86 | break; |
| 87 | case REG_DOUBLE: |
| 88 | insn->op = FILTER_OP_EQ_DOUBLE; |
| 89 | break; |
| 90 | } |
| 91 | reg[REG_R0].type = REG_S64; |
| 92 | next_pc += sizeof(struct binary_op); |
| 93 | break; |
| 94 | } |
| 95 | |
| 96 | case FILTER_OP_NE: |
| 97 | { |
| 98 | struct binary_op *insn = (struct binary_op *) pc; |
| 99 | |
| 100 | switch(reg[REG_R0].type) { |
| 101 | default: |
| 102 | ERR("unknown register type\n"); |
| 103 | ret = -EINVAL; |
| 104 | goto end; |
| 105 | |
| 106 | case REG_STRING: |
| 107 | insn->op = FILTER_OP_NE_STRING; |
| 108 | break; |
| 109 | case REG_S64: |
| 110 | if (reg[REG_R1].type == REG_S64) |
| 111 | insn->op = FILTER_OP_NE_S64; |
| 112 | else |
| 113 | insn->op = FILTER_OP_NE_DOUBLE; |
| 114 | break; |
| 115 | case REG_DOUBLE: |
| 116 | insn->op = FILTER_OP_NE_DOUBLE; |
| 117 | break; |
| 118 | } |
| 119 | reg[REG_R0].type = REG_S64; |
| 120 | next_pc += sizeof(struct binary_op); |
| 121 | break; |
| 122 | } |
| 123 | |
| 124 | case FILTER_OP_GT: |
| 125 | { |
| 126 | struct binary_op *insn = (struct binary_op *) pc; |
| 127 | |
| 128 | switch(reg[REG_R0].type) { |
| 129 | default: |
| 130 | ERR("unknown register type\n"); |
| 131 | ret = -EINVAL; |
| 132 | goto end; |
| 133 | |
| 134 | case REG_STRING: |
| 135 | insn->op = FILTER_OP_GT_STRING; |
| 136 | break; |
| 137 | case REG_S64: |
| 138 | if (reg[REG_R1].type == REG_S64) |
| 139 | insn->op = FILTER_OP_GT_S64; |
| 140 | else |
| 141 | insn->op = FILTER_OP_GT_DOUBLE; |
| 142 | break; |
| 143 | case REG_DOUBLE: |
| 144 | insn->op = FILTER_OP_GT_DOUBLE; |
| 145 | break; |
| 146 | } |
| 147 | reg[REG_R0].type = REG_S64; |
| 148 | next_pc += sizeof(struct binary_op); |
| 149 | break; |
| 150 | } |
| 151 | |
| 152 | case FILTER_OP_LT: |
| 153 | { |
| 154 | struct binary_op *insn = (struct binary_op *) pc; |
| 155 | |
| 156 | switch(reg[REG_R0].type) { |
| 157 | default: |
| 158 | ERR("unknown register type\n"); |
| 159 | ret = -EINVAL; |
| 160 | goto end; |
| 161 | |
| 162 | case REG_STRING: |
| 163 | insn->op = FILTER_OP_LT_STRING; |
| 164 | break; |
| 165 | case REG_S64: |
| 166 | if (reg[REG_R1].type == REG_S64) |
| 167 | insn->op = FILTER_OP_LT_S64; |
| 168 | else |
| 169 | insn->op = FILTER_OP_LT_DOUBLE; |
| 170 | break; |
| 171 | case REG_DOUBLE: |
| 172 | insn->op = FILTER_OP_LT_DOUBLE; |
| 173 | break; |
| 174 | } |
| 175 | reg[REG_R0].type = REG_S64; |
| 176 | next_pc += sizeof(struct binary_op); |
| 177 | break; |
| 178 | } |
| 179 | |
| 180 | case FILTER_OP_GE: |
| 181 | { |
| 182 | struct binary_op *insn = (struct binary_op *) pc; |
| 183 | |
| 184 | switch(reg[REG_R0].type) { |
| 185 | default: |
| 186 | ERR("unknown register type\n"); |
| 187 | ret = -EINVAL; |
| 188 | goto end; |
| 189 | |
| 190 | case REG_STRING: |
| 191 | insn->op = FILTER_OP_GE_STRING; |
| 192 | break; |
| 193 | case REG_S64: |
| 194 | if (reg[REG_R1].type == REG_S64) |
| 195 | insn->op = FILTER_OP_GE_S64; |
| 196 | else |
| 197 | insn->op = FILTER_OP_GE_DOUBLE; |
| 198 | break; |
| 199 | case REG_DOUBLE: |
| 200 | insn->op = FILTER_OP_GE_DOUBLE; |
| 201 | break; |
| 202 | } |
| 203 | reg[REG_R0].type = REG_S64; |
| 204 | next_pc += sizeof(struct binary_op); |
| 205 | break; |
| 206 | } |
| 207 | case FILTER_OP_LE: |
| 208 | { |
| 209 | struct binary_op *insn = (struct binary_op *) pc; |
| 210 | |
| 211 | switch(reg[REG_R0].type) { |
| 212 | default: |
| 213 | ERR("unknown register type\n"); |
| 214 | ret = -EINVAL; |
| 215 | goto end; |
| 216 | |
| 217 | case REG_STRING: |
| 218 | insn->op = FILTER_OP_LE_STRING; |
| 219 | break; |
| 220 | case REG_S64: |
| 221 | if (reg[REG_R1].type == REG_S64) |
| 222 | insn->op = FILTER_OP_LE_S64; |
| 223 | else |
| 224 | insn->op = FILTER_OP_LE_DOUBLE; |
| 225 | break; |
| 226 | case REG_DOUBLE: |
| 227 | insn->op = FILTER_OP_LE_DOUBLE; |
| 228 | break; |
| 229 | } |
| 230 | reg[REG_R0].type = REG_S64; |
| 231 | next_pc += sizeof(struct binary_op); |
| 232 | break; |
| 233 | } |
| 234 | |
| 235 | case FILTER_OP_EQ_STRING: |
| 236 | case FILTER_OP_NE_STRING: |
| 237 | case FILTER_OP_GT_STRING: |
| 238 | case FILTER_OP_LT_STRING: |
| 239 | case FILTER_OP_GE_STRING: |
| 240 | case FILTER_OP_LE_STRING: |
| 241 | case FILTER_OP_EQ_S64: |
| 242 | case FILTER_OP_NE_S64: |
| 243 | case FILTER_OP_GT_S64: |
| 244 | case FILTER_OP_LT_S64: |
| 245 | case FILTER_OP_GE_S64: |
| 246 | case FILTER_OP_LE_S64: |
| 247 | case FILTER_OP_EQ_DOUBLE: |
| 248 | case FILTER_OP_NE_DOUBLE: |
| 249 | case FILTER_OP_GT_DOUBLE: |
| 250 | case FILTER_OP_LT_DOUBLE: |
| 251 | case FILTER_OP_GE_DOUBLE: |
| 252 | case FILTER_OP_LE_DOUBLE: |
| 253 | { |
| 254 | reg[REG_R0].type = REG_S64; |
| 255 | next_pc += sizeof(struct binary_op); |
| 256 | break; |
| 257 | } |
| 258 | |
| 259 | /* unary */ |
| 260 | case FILTER_OP_UNARY_PLUS: |
| 261 | { |
| 262 | struct unary_op *insn = (struct unary_op *) pc; |
| 263 | |
| 264 | switch(reg[insn->reg].type) { |
| 265 | default: |
| 266 | ERR("unknown register type\n"); |
| 267 | ret = -EINVAL; |
| 268 | goto end; |
| 269 | |
| 270 | case REG_S64: |
| 271 | insn->op = FILTER_OP_UNARY_PLUS_S64; |
| 272 | break; |
| 273 | case REG_DOUBLE: |
| 274 | insn->op = FILTER_OP_UNARY_PLUS_DOUBLE; |
| 275 | break; |
| 276 | } |
| 277 | next_pc += sizeof(struct unary_op); |
| 278 | break; |
| 279 | } |
| 280 | |
| 281 | case FILTER_OP_UNARY_MINUS: |
| 282 | { |
| 283 | struct unary_op *insn = (struct unary_op *) pc; |
| 284 | |
| 285 | switch(reg[insn->reg].type) { |
| 286 | default: |
| 287 | ERR("unknown register type\n"); |
| 288 | ret = -EINVAL; |
| 289 | goto end; |
| 290 | |
| 291 | case REG_S64: |
| 292 | insn->op = FILTER_OP_UNARY_MINUS_S64; |
| 293 | break; |
| 294 | case REG_DOUBLE: |
| 295 | insn->op = FILTER_OP_UNARY_MINUS_DOUBLE; |
| 296 | break; |
| 297 | } |
| 298 | next_pc += sizeof(struct unary_op); |
| 299 | break; |
| 300 | } |
| 301 | |
| 302 | case FILTER_OP_UNARY_NOT: |
| 303 | { |
| 304 | struct unary_op *insn = (struct unary_op *) pc; |
| 305 | |
| 306 | switch(reg[insn->reg].type) { |
| 307 | default: |
| 308 | ERR("unknown register type\n"); |
| 309 | ret = -EINVAL; |
| 310 | goto end; |
| 311 | |
| 312 | case REG_S64: |
| 313 | insn->op = FILTER_OP_UNARY_NOT_S64; |
| 314 | break; |
| 315 | case REG_DOUBLE: |
| 316 | insn->op = FILTER_OP_UNARY_NOT_DOUBLE; |
| 317 | break; |
| 318 | } |
| 319 | next_pc += sizeof(struct unary_op); |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | case FILTER_OP_UNARY_PLUS_S64: |
| 324 | case FILTER_OP_UNARY_MINUS_S64: |
| 325 | case FILTER_OP_UNARY_NOT_S64: |
| 326 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 327 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 328 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 329 | { |
| 330 | next_pc += sizeof(struct unary_op); |
| 331 | break; |
| 332 | } |
| 333 | |
| 334 | /* logical */ |
| 335 | case FILTER_OP_AND: |
| 336 | case FILTER_OP_OR: |
| 337 | { |
| 338 | next_pc += sizeof(struct logical_op); |
| 339 | break; |
| 340 | } |
| 341 | |
| 342 | /* load */ |
| 343 | case FILTER_OP_LOAD_FIELD_REF: |
| 344 | { |
| 345 | ERR("Unknown field ref type\n"); |
| 346 | ret = -EINVAL; |
| 347 | goto end; |
| 348 | } |
| 349 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 350 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 351 | { |
| 352 | struct load_op *insn = (struct load_op *) pc; |
| 353 | |
| 354 | reg[insn->reg].type = REG_STRING; |
| 355 | reg[insn->reg].literal = 0; |
| 356 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 357 | break; |
| 358 | } |
| 359 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 360 | { |
| 361 | struct load_op *insn = (struct load_op *) pc; |
| 362 | |
| 363 | reg[insn->reg].type = REG_S64; |
| 364 | reg[insn->reg].literal = 0; |
| 365 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 366 | break; |
| 367 | } |
| 368 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 369 | { |
| 370 | struct load_op *insn = (struct load_op *) pc; |
| 371 | |
| 372 | reg[insn->reg].type = REG_DOUBLE; |
| 373 | reg[insn->reg].literal = 0; |
| 374 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 375 | break; |
| 376 | } |
| 377 | |
| 378 | case FILTER_OP_LOAD_STRING: |
| 379 | { |
| 380 | struct load_op *insn = (struct load_op *) pc; |
| 381 | |
| 382 | reg[insn->reg].type = REG_STRING; |
| 383 | reg[insn->reg].literal = 1; |
| 384 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 385 | break; |
| 386 | } |
| 387 | |
| 388 | case FILTER_OP_LOAD_S64: |
| 389 | { |
| 390 | struct load_op *insn = (struct load_op *) pc; |
| 391 | |
| 392 | reg[insn->reg].type = REG_S64; |
| 393 | reg[insn->reg].literal = 1; |
| 394 | next_pc += sizeof(struct load_op) |
| 395 | + sizeof(struct literal_numeric); |
| 396 | break; |
| 397 | } |
| 398 | |
| 399 | case FILTER_OP_LOAD_DOUBLE: |
| 400 | { |
| 401 | struct load_op *insn = (struct load_op *) pc; |
| 402 | |
| 403 | reg[insn->reg].type = REG_DOUBLE; |
| 404 | reg[insn->reg].literal = 1; |
| 405 | next_pc += sizeof(struct load_op) |
| 406 | + sizeof(struct literal_double); |
| 407 | break; |
| 408 | } |
| 409 | |
| 410 | /* cast */ |
| 411 | case FILTER_OP_CAST_TO_S64: |
| 412 | { |
| 413 | struct cast_op *insn = (struct cast_op *) pc; |
| 414 | |
| 415 | switch (reg[insn->reg].type) { |
| 416 | default: |
| 417 | ERR("unknown register type\n"); |
| 418 | ret = -EINVAL; |
| 419 | goto end; |
| 420 | |
| 421 | case REG_STRING: |
| 422 | ERR("Cast op can only be applied to numeric or floating point registers\n"); |
| 423 | ret = -EINVAL; |
| 424 | goto end; |
| 425 | case REG_S64: |
| 426 | insn->op = FILTER_OP_CAST_NOP; |
| 427 | break; |
| 428 | case REG_DOUBLE: |
| 429 | insn->op = FILTER_OP_CAST_DOUBLE_TO_S64; |
| 430 | break; |
| 431 | } |
| 432 | reg[insn->reg].type = REG_S64; |
| 433 | next_pc += sizeof(struct cast_op); |
| 434 | break; |
| 435 | } |
| 436 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 437 | { |
| 438 | struct cast_op *insn = (struct cast_op *) pc; |
| 439 | |
| 440 | reg[insn->reg].type = REG_S64; |
| 441 | next_pc += sizeof(struct cast_op); |
| 442 | break; |
| 443 | } |
| 444 | case FILTER_OP_CAST_NOP: |
| 445 | { |
| 446 | next_pc += sizeof(struct cast_op); |
| 447 | break; |
| 448 | } |
| 449 | |
| 450 | |
| 451 | } |
| 452 | } |
| 453 | end: |
| 454 | return ret; |
| 455 | } |