| 1 | |
| 2 | #define __KERNEL__ |
| 3 | |
| 4 | #include <assert.h> |
| 5 | #include <sys/types.h> |
| 6 | #include <stdint.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | |
| 10 | #include <linux/compiler.h> |
| 11 | |
| 12 | #define min(a,b) (((a)<(b))?a:b) |
| 13 | #define max(a,b) (((a)>(b))?a:b) |
| 14 | #define BUG_ON(a) assert(!(a)) |
| 15 | |
| 16 | // Useful outside __KERNEL__. Not used here because inline is already redefined. |
| 17 | #define force_inline inline __attribute__((always_inline)) |
| 18 | |
| 19 | /* Calculate the offset needed to align the type */ |
| 20 | static inline unsigned int ltt_align(size_t align_drift, |
| 21 | size_t size_of_type) |
| 22 | { |
| 23 | size_t alignment = min(sizeof(void*), size_of_type); |
| 24 | |
| 25 | return ((alignment - align_drift) & (alignment-1)); |
| 26 | } |
| 27 | |
| 28 | |
| 29 | /* TEMPLATE */ |
| 30 | |
| 31 | enum lttng_tasklet_priority { |
| 32 | LTTNG_LOW, |
| 33 | LTTNG_HIGH, |
| 34 | }; |
| 35 | |
| 36 | enum lttng_irq_mode { |
| 37 | LTTNG_user, |
| 38 | LTTNG_kernel, |
| 39 | }; |
| 40 | |
| 41 | struct lttng_mystruct2 { |
| 42 | unsigned int irq_id; |
| 43 | enum lttng_irq_mode mode; |
| 44 | //struct lttng_mystruct teststr1; |
| 45 | }; |
| 46 | |
| 47 | #if 0 |
| 48 | static inline size_t lttng_get_size_mystruct2( |
| 49 | struct lttng_mystruct2 * obj) |
| 50 | { |
| 51 | size_t size=0, locsize; |
| 52 | |
| 53 | locsize = sizeof(unsigned int); |
| 54 | size += ltt_align(size, locsize) + locsize; |
| 55 | |
| 56 | locsize = sizeof(enum lttng_irq_mode); |
| 57 | size += ltt_align(size, locsize) + locsize; |
| 58 | |
| 59 | BUG_ON(sizeof(struct lttng_mystruct2) != size); |
| 60 | |
| 61 | return sizeof(struct lttng_mystruct2); |
| 62 | } |
| 63 | #endif //0 |
| 64 | |
| 65 | static inline size_t lttng_get_alignment_mystruct2( |
| 66 | struct lttng_mystruct2 *obj) |
| 67 | { |
| 68 | size_t align=0, localign; |
| 69 | |
| 70 | localign = sizeof(unsigned int); |
| 71 | align = max(align, localign); |
| 72 | |
| 73 | localign = sizeof(enum lttng_irq_mode); |
| 74 | align = max(align, localign); |
| 75 | |
| 76 | return align; |
| 77 | } |
| 78 | |
| 79 | static inline void lttng_write_mystruct2( |
| 80 | void *buffer, |
| 81 | size_t *to_base, |
| 82 | size_t *to, |
| 83 | void **from, |
| 84 | size_t *len, |
| 85 | struct lttng_mystruct2 *obj) |
| 86 | { |
| 87 | size_t align, size; |
| 88 | |
| 89 | align = lttng_get_alignment_mystruct2(obj); |
| 90 | //size = lttng_get_size_mystruct2(obj); |
| 91 | size = sizeof(struct lttng_mystruct2); |
| 92 | |
| 93 | if(*len == 0) { |
| 94 | *to += ltt_align(*to, align); /* align output */ |
| 95 | } else { |
| 96 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 97 | } |
| 98 | |
| 99 | *len += size; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | |
| 104 | #define LTTNG_ARRAY_SIZE_mystruct_myarray 10 |
| 105 | typedef uint64_t lttng_array_mystruct_myarray[LTTNG_ARRAY_SIZE_mystruct_myarray]; |
| 106 | |
| 107 | #if 0 |
| 108 | static inline size_t lttng_get_size_array_mystruct_myarray( |
| 109 | lttng_array_mystruct_myarray obj) |
| 110 | { |
| 111 | size_t size=0, locsize; |
| 112 | |
| 113 | locsize = sizeof(uint64_t); |
| 114 | /* ltt_align == 0 always*/ |
| 115 | //size += ltt_align(size, locsize) + (LTTNG_ARRAY_SIZE_mystruct_myarray * locsize); |
| 116 | BUG_ON(ltt_align(size, locsize) != 0); |
| 117 | size += LTTNG_ARRAY_SIZE_mystruct_myarray * locsize; |
| 118 | |
| 119 | BUG_ON(sizeof(lttng_array_mystruct_myarray) != size); |
| 120 | |
| 121 | return sizeof(lttng_array_mystruct_myarray); |
| 122 | } |
| 123 | #endif //0 |
| 124 | |
| 125 | static inline size_t lttng_get_alignment_array_mystruct_myarray( |
| 126 | lttng_array_mystruct_myarray obj) |
| 127 | { |
| 128 | size_t align=0, localign; |
| 129 | |
| 130 | localign = sizeof(uint64_t); |
| 131 | align = max(align, localign); |
| 132 | |
| 133 | return align; |
| 134 | } |
| 135 | |
| 136 | |
| 137 | static inline void lttng_write_array_mystruct_myarray( |
| 138 | void *buffer, |
| 139 | size_t *to_base, |
| 140 | size_t *to, |
| 141 | void **from, |
| 142 | size_t *len, |
| 143 | lttng_array_mystruct_myarray obj) |
| 144 | { |
| 145 | size_t align, size; |
| 146 | |
| 147 | align = lttng_get_alignment_array_mystruct_myarray(obj); |
| 148 | //size = lttng_get_size_array_mystruct_myarray(obj); |
| 149 | size = sizeof(lttng_array_mystruct_myarray); |
| 150 | |
| 151 | if(*len == 0) { |
| 152 | *to += ltt_align(*to, align); /* align output */ |
| 153 | } else { |
| 154 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 155 | } |
| 156 | |
| 157 | *len += size; |
| 158 | #if 0 |
| 159 | /* For varlen child : let the child align itself. */ |
| 160 | for(unsigned int i=0; i<LTTNG_ARRAY_SIZE_mystruct_myarray; i++) { |
| 161 | lttng_write_child(buffer, to_base, to, from, len, obj[i]); |
| 162 | } |
| 163 | #endif //0 |
| 164 | |
| 165 | } |
| 166 | |
| 167 | |
| 168 | typedef struct lttng_sequence_mystruct_mysequence lttng_sequence_mystruct_mysequence; |
| 169 | struct lttng_sequence_mystruct_mysequence { |
| 170 | unsigned int len; |
| 171 | double *array; |
| 172 | }; |
| 173 | |
| 174 | #if 0 |
| 175 | static inline size_t lttng_get_size_sequence_mystruct_mysequence( |
| 176 | lttng_sequence_mystruct_mysequence *obj) |
| 177 | { |
| 178 | size_t size=0, locsize; |
| 179 | |
| 180 | locsize = sizeof(unsigned int); |
| 181 | size += ltt_align(size, locsize) + locsize; |
| 182 | |
| 183 | locsize = sizeof(double); |
| 184 | size += ltt_align(size, locsize) + (obj->len * locsize); |
| 185 | |
| 186 | /* Realign on arch size */ |
| 187 | locsize = sizeof(void *); |
| 188 | size += ltt_align(size, locsize); |
| 189 | |
| 190 | return size; |
| 191 | } |
| 192 | #endif //0 |
| 193 | |
| 194 | static inline size_t lttng_get_alignment_sequence_mystruct_mysequence( |
| 195 | lttng_sequence_mystruct_mysequence *obj) |
| 196 | { |
| 197 | size_t align=0, localign; |
| 198 | |
| 199 | localign = sizeof(unsigned int); |
| 200 | align = max(align, localign); |
| 201 | |
| 202 | localign = sizeof(double); |
| 203 | align = max(align, localign); |
| 204 | |
| 205 | return align; |
| 206 | } |
| 207 | |
| 208 | |
| 209 | static inline void lttng_write_sequence_mystruct_mysequence( |
| 210 | void *buffer, |
| 211 | size_t *to_base, |
| 212 | size_t *to, |
| 213 | void **from, |
| 214 | size_t *len, |
| 215 | lttng_sequence_mystruct_mysequence *obj) |
| 216 | { |
| 217 | size_t align; |
| 218 | size_t size; |
| 219 | |
| 220 | /* Flush pending memcpy */ |
| 221 | if(*len != 0) { |
| 222 | if(buffer != NULL) |
| 223 | memcpy(buffer+*to_base+*to, *from, *len); |
| 224 | } |
| 225 | *to += *len; |
| 226 | *len = 0; |
| 227 | |
| 228 | align = lttng_get_alignment_sequence_mystruct_mysequence(obj); |
| 229 | //no need size = lttng_get_size_sequence_mystruct_mysequence(obj); |
| 230 | |
| 231 | /* Align output */ |
| 232 | *to += ltt_align(*to, align); /* *len = 0 in this function */ |
| 233 | |
| 234 | /* Copy members */ |
| 235 | size = sizeof(unsigned int); |
| 236 | *to += ltt_align(*to, size); |
| 237 | if(buffer != NULL) |
| 238 | memcpy(buffer+*to_base+*to, &obj->len, size); |
| 239 | *to += size; |
| 240 | |
| 241 | size = sizeof(double); |
| 242 | *to += ltt_align(*to, size); |
| 243 | size = obj->len * sizeof(double); |
| 244 | if(buffer != NULL) |
| 245 | memcpy(buffer+*to_base+*to, obj->array, size); |
| 246 | *to += size; |
| 247 | #if 0 |
| 248 | /* If varlen child : let child align itself */ |
| 249 | for(unsigned int i=0; i<obj->len; i++) { |
| 250 | lttng_write_child(buffer, to_base, to, from, len, obj->array[i]); |
| 251 | } |
| 252 | #endif //0 |
| 253 | |
| 254 | |
| 255 | /* Realign the *to_base on arch size, set *to to 0 */ |
| 256 | *to = ltt_align(*to, sizeof(void *)); |
| 257 | *to_base = *to_base+*to; |
| 258 | *to = 0; |
| 259 | |
| 260 | /* Put source *from just after the C sequence */ |
| 261 | *from = obj+1; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | |
| 266 | union lttng_mystruct_myunion { |
| 267 | double myfloat; |
| 268 | unsigned long myulong; |
| 269 | }; |
| 270 | |
| 271 | #if 0 |
| 272 | static inline size_t lttng_get_size_mystruct_myunion( |
| 273 | union lttng_mystruct_myunion *obj) |
| 274 | { |
| 275 | size_t size=0, locsize; |
| 276 | |
| 277 | locsize = sizeof(double); |
| 278 | size = max(size, locsize); |
| 279 | |
| 280 | locsize = sizeof(unsigned long); |
| 281 | size = max(size, locsize); |
| 282 | |
| 283 | BUG_ON(size != sizeof(union lttng_mystruct_myunion)); |
| 284 | |
| 285 | return sizeof(union lttng_mystruct_myunion); |
| 286 | } |
| 287 | #endif //0 |
| 288 | |
| 289 | static inline size_t lttng_get_alignment_mystruct_myunion( |
| 290 | union lttng_mystruct_myunion *obj) |
| 291 | { |
| 292 | size_t align=0, localign; |
| 293 | |
| 294 | localign = sizeof(double); |
| 295 | align = max(align, localign); |
| 296 | |
| 297 | localign = sizeof(unsigned long); |
| 298 | align = max(align, localign); |
| 299 | |
| 300 | return align; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | static inline void lttng_write_mystruct_myunion( |
| 305 | void *buffer, |
| 306 | size_t *to_base, |
| 307 | size_t *to, |
| 308 | void **from, |
| 309 | size_t *len, |
| 310 | union lttng_mystruct_myunion *obj) |
| 311 | { |
| 312 | size_t align, size; |
| 313 | |
| 314 | align = lttng_get_alignment_mystruct_myunion(obj); |
| 315 | //size = lttng_get_size_mystruct_myunion(obj); |
| 316 | size = sizeof(union lttng_mystruct_myunion); |
| 317 | |
| 318 | if(*len == 0) { |
| 319 | *to += ltt_align(*to, align); /* align output */ |
| 320 | } else { |
| 321 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 322 | } |
| 323 | |
| 324 | *len += size; |
| 325 | |
| 326 | /* Assert : no varlen child. */ |
| 327 | } |
| 328 | |
| 329 | |
| 330 | struct lttng_mystruct { |
| 331 | unsigned int irq_id; |
| 332 | enum lttng_irq_mode mode; |
| 333 | struct lttng_mystruct2 teststr; |
| 334 | lttng_array_mystruct_myarray myarray; |
| 335 | lttng_sequence_mystruct_mysequence mysequence; |
| 336 | union lttng_mystruct_myunion myunion; |
| 337 | }; |
| 338 | |
| 339 | #if 0 |
| 340 | static inline size_t lttng_get_size_mystruct( |
| 341 | struct lttng_mystruct *obj) |
| 342 | { |
| 343 | size_t size=0, locsize, localign; |
| 344 | |
| 345 | locsize = sizeof(unsigned int); |
| 346 | size += ltt_align(size, locsize) + locsize; |
| 347 | |
| 348 | locsize = sizeof(enum lttng_irq_mode); |
| 349 | size += ltt_align(size, locsize) + locsize; |
| 350 | |
| 351 | localign = lttng_get_alignment_mystruct2(&obj->teststr); |
| 352 | locsize = lttng_get_size_mystruct2(&obj->teststr); |
| 353 | size += ltt_align(size, localign) + locsize; |
| 354 | |
| 355 | localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray); |
| 356 | locsize = lttng_get_size_array_mystruct_myarray(obj->myarray); |
| 357 | size += ltt_align(size, localign) + locsize; |
| 358 | |
| 359 | localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence); |
| 360 | locsize = lttng_get_size_sequence_mystruct_mysequence(&obj->mysequence); |
| 361 | size += ltt_align(size, localign) + locsize; |
| 362 | |
| 363 | localign = lttng_get_alignment_mystruct_myunion(&obj->myunion); |
| 364 | locsize = lttng_get_size_mystruct_myunion(&obj->myunion); |
| 365 | size += ltt_align(size, localign) + locsize; |
| 366 | |
| 367 | return size; |
| 368 | } |
| 369 | #endif //0 |
| 370 | |
| 371 | static inline size_t lttng_get_alignment_mystruct( |
| 372 | struct lttng_mystruct *obj) |
| 373 | { |
| 374 | size_t align=0, localign; |
| 375 | |
| 376 | localign = sizeof(unsigned int); |
| 377 | align = max(align, localign); |
| 378 | |
| 379 | localign = sizeof(enum lttng_irq_mode); |
| 380 | align = max(align, localign); |
| 381 | |
| 382 | localign = lttng_get_alignment_mystruct2(&obj->teststr); |
| 383 | align = max(align, localign); |
| 384 | |
| 385 | localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray); |
| 386 | align = max(align, localign); |
| 387 | |
| 388 | localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence); |
| 389 | align = max(align, localign); |
| 390 | |
| 391 | localign = lttng_get_alignment_mystruct_myunion(&obj->myunion); |
| 392 | align = max(align, localign); |
| 393 | |
| 394 | return align; |
| 395 | } |
| 396 | |
| 397 | static inline void lttng_write_mystruct( |
| 398 | void *buffer, |
| 399 | size_t *to_base, |
| 400 | size_t *to, |
| 401 | void **from, |
| 402 | size_t *len, |
| 403 | struct lttng_mystruct *obj) |
| 404 | { |
| 405 | size_t align, size; |
| 406 | |
| 407 | align = lttng_get_alignment_mystruct(obj); |
| 408 | // no need : contains variable size fields. |
| 409 | // locsize = lttng_get_size_mystruct(obj); |
| 410 | |
| 411 | if(*len == 0) { |
| 412 | *to += ltt_align(*to, align); /* align output */ |
| 413 | } else { |
| 414 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 415 | } |
| 416 | |
| 417 | /* Contains variable sized fields : must explode the structure */ |
| 418 | |
| 419 | size = sizeof(unsigned int); |
| 420 | size += ltt_align(*to+*len, size) + size; |
| 421 | *len += size; |
| 422 | |
| 423 | size = sizeof(enum lttng_irq_mode); |
| 424 | size += ltt_align(*to+*len, size) + size; |
| 425 | *len += size; |
| 426 | |
| 427 | lttng_write_mystruct2(buffer, to_base, to, from, len, &obj->teststr); |
| 428 | |
| 429 | lttng_write_array_mystruct_myarray(buffer, to_base, to, from, len, obj->myarray); |
| 430 | |
| 431 | /* Variable length field */ |
| 432 | lttng_write_sequence_mystruct_mysequence(buffer, to_base, to, from, len, &obj->mysequence); |
| 433 | /* After this previous write, we are sure that *to is 0, *len is 0 and |
| 434 | * *to_base is aligned on the architecture size : to rest of alignment will |
| 435 | * be calculated statically. */ |
| 436 | |
| 437 | lttng_write_mystruct_myunion(buffer, to_base, to, from, len, &obj->myunion); |
| 438 | |
| 439 | /* Don't forget to flush last write..... */ |
| 440 | } |
| 441 | |
| 442 | |
| 443 | |
| 444 | |
| 445 | |
| 446 | |
| 447 | //void main() |
| 448 | void test() |
| 449 | { |
| 450 | struct lttng_mystruct test; |
| 451 | test.mysequence.len = 20; |
| 452 | test.mysequence.array = malloc(20); |
| 453 | |
| 454 | //size_t size = lttng_get_size_mystruct(&test); |
| 455 | //size_t align = lttng_get_alignment_mystruct(&test); |
| 456 | // |
| 457 | size_t to_base = 0; /* the buffer is allocated on arch_size alignment */ |
| 458 | size_t to = 0; |
| 459 | void *from = &test; |
| 460 | size_t len = 0; |
| 461 | |
| 462 | /* Get size */ |
| 463 | lttng_write_mystruct(NULL, &to_base, &to, &from, &len, &test); |
| 464 | /* Size = to_base + to + len */ |
| 465 | |
| 466 | void *buffer = malloc(to_base + to + len); |
| 467 | to_base = 0; /* the buffer is allocated on arch_size alignment */ |
| 468 | to = 0; |
| 469 | from = &test; |
| 470 | len = 0; |
| 471 | |
| 472 | lttng_write_mystruct(buffer, &to_base, &to, &from, &len, &test); |
| 473 | /* Final flush */ |
| 474 | /* Flush pending memcpy */ |
| 475 | if(len != 0) { |
| 476 | // Assert buffer != NULL */ |
| 477 | memcpy(buffer+to_base+to, from, len); |
| 478 | to += len; |
| 479 | from += len; |
| 480 | len = 0; |
| 481 | } |
| 482 | |
| 483 | free(test.mysequence.array); |
| 484 | free(buffer); |
| 485 | } |