J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * - Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * - Neither the name of Sun Microsystems nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived |
| 17 | * from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 20 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 21 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* Class reader writer (java_crw_demo) for instrumenting bytecodes */ |
| 33 | |
| 34 | /* |
| 35 | * As long as the callbacks allow for it and the class number is unique, |
| 36 | * this code is completely re-entrant and any number of classfile |
| 37 | * injections can happen at the same time. |
| 38 | * |
| 39 | * The current logic requires a unique number for this class instance |
| 40 | * or (jclass,jobject loader) pair, this is done via the ClassIndex |
| 41 | * in hprof, which is passed in as the 'unsigned cnum' to java_crw_demo(). |
| 42 | * It's up to the user of this interface if it wants to use this |
| 43 | * feature. |
| 44 | * |
| 45 | */ |
| 46 | |
| 47 | #include <stdio.h> |
| 48 | #include <stdlib.h> |
| 49 | #include <string.h> |
| 50 | |
| 51 | /* Get Java and class file and bytecode information. */ |
| 52 | |
| 53 | #include <jni.h> |
| 54 | |
| 55 | #include "classfile_constants.h" |
| 56 | |
| 57 | |
| 58 | /* Include our own interface for cross check */ |
| 59 | |
| 60 | #include "java_crw_demo.h" |
| 61 | |
| 62 | /* Macros over error functions to capture line numbers */ |
| 63 | |
| 64 | #define CRW_FATAL(ci, message) fatal_error(ci, message, __FILE__, __LINE__) |
| 65 | |
| 66 | #if defined(DEBUG) || !defined(NDEBUG) |
| 67 | |
| 68 | #define CRW_ASSERT(ci, cond) \ |
| 69 | ((cond)?(void)0:assert_error(ci, #cond, __FILE__, __LINE__)) |
| 70 | |
| 71 | #else |
| 72 | |
| 73 | #define CRW_ASSERT(ci, cond) |
| 74 | |
| 75 | #endif |
| 76 | |
| 77 | #define CRW_ASSERT_MI(mi) CRW_ASSERT((mi)?(mi)->ci:NULL,(mi)!=NULL) |
| 78 | |
| 79 | #define CRW_ASSERT_CI(ci) CRW_ASSERT(ci, ( (ci) != NULL && \ |
| 80 | (ci)->input_position <= (ci)->input_len && \ |
| 81 | (ci)->output_position <= (ci)->output_len) ) |
| 82 | |
| 83 | /* Typedefs for various integral numbers, just for code clarity */ |
| 84 | |
| 85 | typedef unsigned ClassOpcode; /* One opcode */ |
| 86 | typedef unsigned char ByteCode; /* One byte from bytecodes */ |
| 87 | typedef int ByteOffset; /* Byte offset */ |
| 88 | typedef int ClassConstant; /* Constant pool kind */ |
| 89 | typedef long CrwPosition; /* Position in class image */ |
| 90 | typedef unsigned short CrwCpoolIndex; /* Index into constant pool */ |
| 91 | |
| 92 | /* Misc support macros */ |
| 93 | |
| 94 | /* Given the position of an opcode, find the next 4byte boundary position */ |
| 95 | #define NEXT_4BYTE_BOUNDARY(opcode_pos) (((opcode_pos)+4) & (~3)) |
| 96 | |
| 97 | #define LARGEST_INJECTION (12*3) /* 3 injections at same site */ |
| 98 | #define MAXIMUM_NEW_CPOOL_ENTRIES 64 /* don't add more than 32 entries */ |
| 99 | |
| 100 | /* Constant Pool Entry (internal table that mirrors pool in file image) */ |
| 101 | |
| 102 | typedef struct { |
| 103 | const char * ptr; /* Pointer to any string */ |
| 104 | unsigned short len; /* Length of string */ |
| 105 | unsigned int index1; /* 1st 16 bit index or 32bit value. */ |
| 106 | unsigned int index2; /* 2nd 16 bit index or 32bit value. */ |
| 107 | ClassConstant tag; /* Tag or kind of entry. */ |
| 108 | } CrwConstantPoolEntry; |
| 109 | |
| 110 | struct MethodImage; |
| 111 | |
| 112 | /* Class file image storage structure */ |
| 113 | |
| 114 | typedef struct CrwClassImage { |
| 115 | |
| 116 | /* Unique class number for this class */ |
| 117 | unsigned number; |
| 118 | |
| 119 | /* Name of class, given or gotten out of class image */ |
| 120 | const char * name; |
| 121 | |
| 122 | /* Input and Output class images tracking */ |
| 123 | const unsigned char * input; |
| 124 | unsigned char * output; |
| 125 | CrwPosition input_len; |
| 126 | CrwPosition output_len; |
| 127 | CrwPosition input_position; |
| 128 | CrwPosition output_position; |
| 129 | |
| 130 | /* Mirrored constant pool */ |
| 131 | CrwConstantPoolEntry * cpool; |
| 132 | CrwCpoolIndex cpool_max_elements; /* Max count */ |
| 133 | CrwCpoolIndex cpool_count_plus_one; |
| 134 | |
| 135 | /* Input flags about class (e.g. is it a system class) */ |
| 136 | int system_class; |
| 137 | |
| 138 | /* Class access flags gotten from file. */ |
| 139 | unsigned access_flags; |
| 140 | |
| 141 | /* Names of classes and methods. */ |
| 142 | char* tclass_name; /* Name of class that has tracker methods. */ |
| 143 | char* tclass_sig; /* Signature of class */ |
| 144 | char* call_name; /* Method name to call at offset 0 */ |
| 145 | char* call_sig; /* Signature of this method */ |
| 146 | char* return_name; /* Method name to call before any return */ |
| 147 | char* return_sig; /* Signature of this method */ |
| 148 | char* obj_init_name; /* Method name to call in Object <init> */ |
| 149 | char* obj_init_sig; /* Signature of this method */ |
| 150 | char* newarray_name; /* Method name to call after newarray opcodes */ |
| 151 | char* newarray_sig; /* Signature of this method */ |
| 152 | |
| 153 | /* Constant pool index values for new entries */ |
| 154 | CrwCpoolIndex tracker_class_index; |
| 155 | CrwCpoolIndex object_init_tracker_index; |
| 156 | CrwCpoolIndex newarray_tracker_index; |
| 157 | CrwCpoolIndex call_tracker_index; |
| 158 | CrwCpoolIndex return_tracker_index; |
| 159 | CrwCpoolIndex class_number_index; /* Class number in pool */ |
| 160 | |
| 161 | /* Count of injections made into this class */ |
| 162 | int injection_count; |
| 163 | |
| 164 | /* This class must be the java.lang.Object class */ |
| 165 | jboolean is_object_class; |
| 166 | |
| 167 | /* This class must be the java.lang.Thread class */ |
| 168 | jboolean is_thread_class; |
| 169 | |
| 170 | /* Callback functions */ |
| 171 | FatalErrorHandler fatal_error_handler; |
| 172 | MethodNumberRegister mnum_callback; |
| 173 | |
| 174 | /* Table of method names and descr's */ |
| 175 | int method_count; |
| 176 | const char ** method_name; |
| 177 | const char ** method_descr; |
| 178 | struct MethodImage * current_mi; |
| 179 | |
| 180 | } CrwClassImage; |
| 181 | |
| 182 | /* Injection bytecodes (holds injected bytecodes for each code position) */ |
| 183 | |
| 184 | typedef struct { |
| 185 | ByteCode * code; |
| 186 | ByteOffset len; |
| 187 | } Injection; |
| 188 | |
| 189 | /* Method transformation data (allocated/freed as each method is processed) */ |
| 190 | |
| 191 | typedef struct MethodImage { |
| 192 | |
| 193 | /* Back reference to Class image data. */ |
| 194 | CrwClassImage * ci; |
| 195 | |
| 196 | /* Unique method number for this class. */ |
| 197 | unsigned number; |
| 198 | |
| 199 | /* Method name and descr */ |
| 200 | const char * name; |
| 201 | const char * descr; |
| 202 | |
| 203 | /* Map of input bytecode offsets to output bytecode offsets */ |
| 204 | ByteOffset * map; |
| 205 | |
| 206 | /* Bytecode injections for each input bytecode offset */ |
| 207 | Injection * injections; |
| 208 | |
| 209 | /* Widening setting for each input bytecode offset */ |
| 210 | signed char * widening; |
| 211 | |
| 212 | /* Length of original input bytecodes, and new bytecodes. */ |
| 213 | ByteOffset code_len; |
| 214 | ByteOffset new_code_len; |
| 215 | |
| 216 | /* Location in input where bytecodes are located. */ |
| 217 | CrwPosition start_of_input_bytecodes; |
| 218 | |
| 219 | /* Original max_stack and new max stack */ |
| 220 | unsigned max_stack; |
| 221 | unsigned new_max_stack; |
| 222 | |
| 223 | jboolean object_init_method; |
| 224 | jboolean skip_call_return_sites; |
| 225 | |
| 226 | /* Method access flags gotten from file. */ |
| 227 | unsigned access_flags; |
| 228 | |
| 229 | } MethodImage; |
| 230 | |
| 231 | /* ----------------------------------------------------------------- */ |
| 232 | /* General support functions (memory and error handling) */ |
| 233 | |
| 234 | static void |
| 235 | fatal_error(CrwClassImage *ci, const char *message, const char *file, int line) |
| 236 | { |
| 237 | if ( ci != NULL && ci->fatal_error_handler != NULL ) { |
| 238 | (*ci->fatal_error_handler)(message, file, line); |
| 239 | } else { |
| 240 | /* Normal operation should NEVER reach here */ |
| 241 | /* NO CRW FATAL ERROR HANDLER! */ |
| 242 | (void)fprintf(stderr, "CRW: %s [%s:%d]\n", message, file, line); |
| 243 | abort(); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | #if defined(DEBUG) || !defined(NDEBUG) |
| 248 | static void |
| 249 | assert_error(CrwClassImage *ci, const char *condition, |
| 250 | const char *file, int line) |
| 251 | { |
| 252 | char buf[512]; |
| 253 | MethodImage *mi; |
| 254 | ByteOffset byte_code_offset; |
| 255 | |
| 256 | mi = ci->current_mi; |
| 257 | if ( mi != NULL ) { |
| 258 | byte_code_offset = (ByteOffset)(mi->ci->input_position - mi->start_of_input_bytecodes); |
| 259 | } else { |
| 260 | byte_code_offset=-1; |
| 261 | } |
| 262 | |
| 263 | (void)sprintf(buf, |
| 264 | "CRW ASSERTION FAILURE: %s (%s:%s:%d)", |
| 265 | condition, |
| 266 | ci->name==0?"?":ci->name, |
| 267 | mi->name==0?"?":mi->name, |
| 268 | byte_code_offset); |
| 269 | fatal_error(ci, buf, file, line); |
| 270 | } |
| 271 | #endif |
| 272 | |
| 273 | static void * |
| 274 | allocate(CrwClassImage *ci, int nbytes) |
| 275 | { |
| 276 | void * ptr; |
| 277 | |
| 278 | if ( nbytes <= 0 ) { |
| 279 | CRW_FATAL(ci, "Cannot allocate <= 0 bytes"); |
| 280 | } |
| 281 | ptr = malloc(nbytes); |
| 282 | if ( ptr == NULL ) { |
| 283 | CRW_FATAL(ci, "Ran out of malloc memory"); |
| 284 | } |
| 285 | return ptr; |
| 286 | } |
| 287 | |
| 288 | static void * |
| 289 | reallocate(CrwClassImage *ci, void *optr, int nbytes) |
| 290 | { |
| 291 | void * ptr; |
| 292 | |
| 293 | if ( optr == NULL ) { |
| 294 | CRW_FATAL(ci, "Cannot deallocate NULL"); |
| 295 | } |
| 296 | if ( nbytes <= 0 ) { |
| 297 | CRW_FATAL(ci, "Cannot reallocate <= 0 bytes"); |
| 298 | } |
| 299 | ptr = realloc(optr, nbytes); |
| 300 | if ( ptr == NULL ) { |
| 301 | CRW_FATAL(ci, "Ran out of malloc memory"); |
| 302 | } |
| 303 | return ptr; |
| 304 | } |
| 305 | |
| 306 | static void * |
| 307 | allocate_clean(CrwClassImage *ci, int nbytes) |
| 308 | { |
| 309 | void * ptr; |
| 310 | |
| 311 | if ( nbytes <= 0 ) { |
| 312 | CRW_FATAL(ci, "Cannot allocate <= 0 bytes"); |
| 313 | } |
| 314 | ptr = calloc(nbytes, 1); |
| 315 | if ( ptr == NULL ) { |
| 316 | CRW_FATAL(ci, "Ran out of malloc memory"); |
| 317 | } |
| 318 | return ptr; |
| 319 | } |
| 320 | |
| 321 | static const char * |
| 322 | duplicate(CrwClassImage *ci, const char *str, int len) |
| 323 | { |
| 324 | char *copy; |
| 325 | |
| 326 | copy = (char*)allocate(ci, len+1); |
| 327 | (void)memcpy(copy, str, len); |
| 328 | copy[len] = 0; |
| 329 | return (const char *)copy; |
| 330 | } |
| 331 | |
| 332 | static void |
| 333 | deallocate(CrwClassImage *ci, void *ptr) |
| 334 | { |
| 335 | if ( ptr == NULL ) { |
| 336 | CRW_FATAL(ci, "Cannot deallocate NULL"); |
| 337 | } |
| 338 | (void)free(ptr); |
| 339 | } |
| 340 | |
| 341 | /* ----------------------------------------------------------------- */ |
| 342 | /* Functions for reading/writing bytes to/from the class images */ |
| 343 | |
| 344 | static unsigned |
| 345 | readU1(CrwClassImage *ci) |
| 346 | { |
| 347 | CRW_ASSERT_CI(ci); |
| 348 | return ((unsigned)(ci->input[ci->input_position++])) & 0xFF; |
| 349 | } |
| 350 | |
| 351 | static unsigned |
| 352 | readU2(CrwClassImage *ci) |
| 353 | { |
| 354 | unsigned res; |
| 355 | |
| 356 | res = readU1(ci); |
| 357 | return (res << 8) + readU1(ci); |
| 358 | } |
| 359 | |
| 360 | static signed short |
| 361 | readS2(CrwClassImage *ci) |
| 362 | { |
| 363 | unsigned res; |
| 364 | |
| 365 | res = readU1(ci); |
| 366 | return ((res << 8) + readU1(ci)) & 0xFFFF; |
| 367 | } |
| 368 | |
| 369 | static unsigned |
| 370 | readU4(CrwClassImage *ci) |
| 371 | { |
| 372 | unsigned res; |
| 373 | |
| 374 | res = readU2(ci); |
| 375 | return (res << 16) + readU2(ci); |
| 376 | } |
| 377 | |
| 378 | static void |
| 379 | writeU1(CrwClassImage *ci, unsigned val) /* Only writes out lower 8 bits */ |
| 380 | { |
| 381 | CRW_ASSERT_CI(ci); |
| 382 | if ( ci->output != NULL ) { |
| 383 | ci->output[ci->output_position++] = val & 0xFF; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | static void |
| 388 | writeU2(CrwClassImage *ci, unsigned val) |
| 389 | { |
| 390 | writeU1(ci, val >> 8); |
| 391 | writeU1(ci, val); |
| 392 | } |
| 393 | |
| 394 | static void |
| 395 | writeU4(CrwClassImage *ci, unsigned val) |
| 396 | { |
| 397 | writeU2(ci, val >> 16); |
| 398 | writeU2(ci, val); |
| 399 | } |
| 400 | |
| 401 | static unsigned |
| 402 | copyU1(CrwClassImage *ci) |
| 403 | { |
| 404 | unsigned value; |
| 405 | |
| 406 | value = readU1(ci); |
| 407 | writeU1(ci, value); |
| 408 | return value; |
| 409 | } |
| 410 | |
| 411 | static unsigned |
| 412 | copyU2(CrwClassImage *ci) |
| 413 | { |
| 414 | unsigned value; |
| 415 | |
| 416 | value = readU2(ci); |
| 417 | writeU2(ci, value); |
| 418 | return value; |
| 419 | } |
| 420 | |
| 421 | static unsigned |
| 422 | copyU4(CrwClassImage *ci) |
| 423 | { |
| 424 | unsigned value; |
| 425 | |
| 426 | value = readU4(ci); |
| 427 | writeU4(ci, value); |
| 428 | return value; |
| 429 | } |
| 430 | |
| 431 | static void |
| 432 | copy(CrwClassImage *ci, unsigned count) |
| 433 | { |
| 434 | CRW_ASSERT_CI(ci); |
| 435 | if ( ci->output != NULL ) { |
| 436 | (void)memcpy(ci->output+ci->output_position, |
| 437 | ci->input+ci->input_position, count); |
| 438 | ci->output_position += count; |
| 439 | } |
| 440 | ci->input_position += count; |
| 441 | CRW_ASSERT_CI(ci); |
| 442 | } |
| 443 | |
| 444 | static void |
| 445 | skip(CrwClassImage *ci, unsigned count) |
| 446 | { |
| 447 | CRW_ASSERT_CI(ci); |
| 448 | ci->input_position += count; |
| 449 | } |
| 450 | |
| 451 | static void |
| 452 | read_bytes(CrwClassImage *ci, void *bytes, unsigned count) |
| 453 | { |
| 454 | CRW_ASSERT_CI(ci); |
| 455 | CRW_ASSERT(ci, bytes!=NULL); |
| 456 | (void)memcpy(bytes, ci->input+ci->input_position, count); |
| 457 | ci->input_position += count; |
| 458 | } |
| 459 | |
| 460 | static void |
| 461 | write_bytes(CrwClassImage *ci, void *bytes, unsigned count) |
| 462 | { |
| 463 | CRW_ASSERT_CI(ci); |
| 464 | CRW_ASSERT(ci, bytes!=NULL); |
| 465 | if ( ci->output != NULL ) { |
| 466 | (void)memcpy(ci->output+ci->output_position, bytes, count); |
| 467 | ci->output_position += count; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | static void |
| 472 | random_writeU2(CrwClassImage *ci, CrwPosition pos, unsigned val) |
| 473 | { |
| 474 | CrwPosition save_position; |
| 475 | |
| 476 | CRW_ASSERT_CI(ci); |
| 477 | save_position = ci->output_position; |
| 478 | ci->output_position = pos; |
| 479 | writeU2(ci, val); |
| 480 | ci->output_position = save_position; |
| 481 | } |
| 482 | |
| 483 | static void |
| 484 | random_writeU4(CrwClassImage *ci, CrwPosition pos, unsigned val) |
| 485 | { |
| 486 | CrwPosition save_position; |
| 487 | |
| 488 | CRW_ASSERT_CI(ci); |
| 489 | save_position = ci->output_position; |
| 490 | ci->output_position = pos; |
| 491 | writeU4(ci, val); |
| 492 | ci->output_position = save_position; |
| 493 | } |
| 494 | |
| 495 | /* ----------------------------------------------------------------- */ |
| 496 | /* Constant Pool handling functions. */ |
| 497 | |
| 498 | static void |
| 499 | fillin_cpool_entry(CrwClassImage *ci, CrwCpoolIndex i, |
| 500 | ClassConstant tag, |
| 501 | unsigned int index1, unsigned int index2, |
| 502 | const char *ptr, int len) |
| 503 | { |
| 504 | CRW_ASSERT_CI(ci); |
| 505 | CRW_ASSERT(ci, i > 0 && i < ci->cpool_count_plus_one); |
| 506 | ci->cpool[i].tag = tag; |
| 507 | ci->cpool[i].index1 = index1; |
| 508 | ci->cpool[i].index2 = index2; |
| 509 | ci->cpool[i].ptr = ptr; |
| 510 | ci->cpool[i].len = (unsigned short)len; |
| 511 | } |
| 512 | |
| 513 | static CrwCpoolIndex |
| 514 | add_new_cpool_entry(CrwClassImage *ci, ClassConstant tag, |
| 515 | unsigned int index1, unsigned int index2, |
| 516 | const char *str, int len) |
| 517 | { |
| 518 | CrwCpoolIndex i; |
| 519 | char *utf8 = NULL; |
| 520 | |
| 521 | CRW_ASSERT_CI(ci); |
| 522 | i = ci->cpool_count_plus_one++; |
| 523 | |
| 524 | /* NOTE: This implementation does not automatically expand the |
| 525 | * constant pool table beyond the expected number needed |
| 526 | * to handle this particular CrwTrackerInterface injections. |
| 527 | * See MAXIMUM_NEW_CPOOL_ENTRIES |
| 528 | */ |
| 529 | CRW_ASSERT(ci, ci->cpool_count_plus_one < ci->cpool_max_elements ); |
| 530 | |
| 531 | writeU1(ci, tag); |
| 532 | switch (tag) { |
| 533 | case JVM_CONSTANT_Class: |
| 534 | writeU2(ci, index1); |
| 535 | break; |
| 536 | case JVM_CONSTANT_String: |
| 537 | writeU2(ci, index1); |
| 538 | break; |
| 539 | case JVM_CONSTANT_Fieldref: |
| 540 | case JVM_CONSTANT_Methodref: |
| 541 | case JVM_CONSTANT_InterfaceMethodref: |
| 542 | case JVM_CONSTANT_Integer: |
| 543 | case JVM_CONSTANT_Float: |
| 544 | case JVM_CONSTANT_NameAndType: |
| 545 | writeU2(ci, index1); |
| 546 | writeU2(ci, index2); |
| 547 | break; |
| 548 | case JVM_CONSTANT_Long: |
| 549 | case JVM_CONSTANT_Double: |
| 550 | writeU4(ci, index1); |
| 551 | writeU4(ci, index2); |
| 552 | ci->cpool_count_plus_one++; |
| 553 | CRW_ASSERT(ci, ci->cpool_count_plus_one < ci->cpool_max_elements ); |
| 554 | break; |
| 555 | case JVM_CONSTANT_Utf8: |
| 556 | CRW_ASSERT(ci, len==(len & 0xFFFF)); |
| 557 | writeU2(ci, len); |
| 558 | write_bytes(ci, (void*)str, len); |
| 559 | utf8 = (char*)duplicate(ci, str, len); |
| 560 | break; |
| 561 | default: |
| 562 | CRW_FATAL(ci, "Unknown constant"); |
| 563 | break; |
| 564 | } |
| 565 | fillin_cpool_entry(ci, i, tag, index1, index2, (const char *)utf8, len); |
| 566 | CRW_ASSERT(ci, i > 0 && i < ci->cpool_count_plus_one); |
| 567 | return i; |
| 568 | } |
| 569 | |
| 570 | static CrwCpoolIndex |
| 571 | add_new_class_cpool_entry(CrwClassImage *ci, const char *class_name) |
| 572 | { |
| 573 | CrwCpoolIndex name_index; |
| 574 | CrwCpoolIndex class_index; |
| 575 | int len; |
| 576 | |
| 577 | CRW_ASSERT_CI(ci); |
| 578 | CRW_ASSERT(ci, class_name!=NULL); |
| 579 | |
| 580 | len = (int)strlen(class_name); |
| 581 | name_index = add_new_cpool_entry(ci, JVM_CONSTANT_Utf8, len, 0, |
| 582 | class_name, len); |
| 583 | class_index = add_new_cpool_entry(ci, JVM_CONSTANT_Class, name_index, 0, |
| 584 | NULL, 0); |
| 585 | return class_index; |
| 586 | } |
| 587 | |
| 588 | static CrwCpoolIndex |
| 589 | add_new_method_cpool_entry(CrwClassImage *ci, CrwCpoolIndex class_index, |
| 590 | const char *name, const char *descr) |
| 591 | { |
| 592 | CrwCpoolIndex name_index; |
| 593 | CrwCpoolIndex descr_index; |
| 594 | CrwCpoolIndex name_type_index; |
| 595 | int len; |
| 596 | |
| 597 | CRW_ASSERT_CI(ci); |
| 598 | CRW_ASSERT(ci, name!=NULL); |
| 599 | CRW_ASSERT(ci, descr!=NULL); |
| 600 | len = (int)strlen(name); |
| 601 | name_index = |
| 602 | add_new_cpool_entry(ci, JVM_CONSTANT_Utf8, len, 0, name, len); |
| 603 | len = (int)strlen(descr); |
| 604 | descr_index = |
| 605 | add_new_cpool_entry(ci, JVM_CONSTANT_Utf8, len, 0, descr, len); |
| 606 | name_type_index = |
| 607 | add_new_cpool_entry(ci, JVM_CONSTANT_NameAndType, |
| 608 | name_index, descr_index, NULL, 0); |
| 609 | return add_new_cpool_entry(ci, JVM_CONSTANT_Methodref, |
| 610 | class_index, name_type_index, NULL, 0); |
| 611 | } |
| 612 | |
| 613 | static CrwConstantPoolEntry |
| 614 | cpool_entry(CrwClassImage *ci, CrwCpoolIndex c_index) |
| 615 | { |
| 616 | CRW_ASSERT_CI(ci); |
| 617 | CRW_ASSERT(ci, c_index > 0 && c_index < ci->cpool_count_plus_one); |
| 618 | return ci->cpool[c_index]; |
| 619 | } |
| 620 | |
| 621 | static void |
| 622 | cpool_setup(CrwClassImage *ci) |
| 623 | { |
| 624 | CrwCpoolIndex i; |
| 625 | CrwPosition cpool_output_position; |
| 626 | int count_plus_one; |
| 627 | |
| 628 | CRW_ASSERT_CI(ci); |
| 629 | cpool_output_position = ci->output_position; |
| 630 | count_plus_one = copyU2(ci); |
| 631 | CRW_ASSERT(ci, count_plus_one>1); |
| 632 | ci->cpool_max_elements = count_plus_one+MAXIMUM_NEW_CPOOL_ENTRIES; |
| 633 | ci->cpool = (CrwConstantPoolEntry*)allocate_clean(ci, |
| 634 | (int)((ci->cpool_max_elements)*sizeof(CrwConstantPoolEntry))); |
| 635 | ci->cpool_count_plus_one = (CrwCpoolIndex)count_plus_one; |
| 636 | |
| 637 | /* Index zero not in class file */ |
| 638 | for (i = 1; i < count_plus_one; ++i) { |
| 639 | CrwCpoolIndex ipos; |
| 640 | ClassConstant tag; |
| 641 | unsigned int index1; |
| 642 | unsigned int index2; |
| 643 | unsigned len; |
| 644 | char * utf8; |
| 645 | |
| 646 | ipos = i; |
| 647 | index1 = 0; |
| 648 | index2 = 0; |
| 649 | len = 0; |
| 650 | utf8 = NULL; |
| 651 | |
| 652 | tag = copyU1(ci); |
| 653 | switch (tag) { |
| 654 | case JVM_CONSTANT_Class: |
| 655 | index1 = copyU2(ci); |
| 656 | break; |
| 657 | case JVM_CONSTANT_String: |
| 658 | index1 = copyU2(ci); |
| 659 | break; |
| 660 | case JVM_CONSTANT_Fieldref: |
| 661 | case JVM_CONSTANT_Methodref: |
| 662 | case JVM_CONSTANT_InterfaceMethodref: |
| 663 | case JVM_CONSTANT_Integer: |
| 664 | case JVM_CONSTANT_Float: |
| 665 | case JVM_CONSTANT_NameAndType: |
| 666 | index1 = copyU2(ci); |
| 667 | index2 = copyU2(ci); |
| 668 | break; |
| 669 | case JVM_CONSTANT_Long: |
| 670 | case JVM_CONSTANT_Double: |
| 671 | index1 = copyU4(ci); |
| 672 | index2 = copyU4(ci); |
| 673 | ++i; /* // these take two CP entries - duh! */ |
| 674 | break; |
| 675 | case JVM_CONSTANT_Utf8: |
| 676 | len = copyU2(ci); |
| 677 | index1 = (unsigned short)len; |
| 678 | utf8 = (char*)allocate(ci, len+1); |
| 679 | read_bytes(ci, (void*)utf8, len); |
| 680 | utf8[len] = 0; |
| 681 | write_bytes(ci, (void*)utf8, len); |
| 682 | break; |
| 683 | default: |
| 684 | CRW_FATAL(ci, "Unknown constant"); |
| 685 | break; |
| 686 | } |
| 687 | fillin_cpool_entry(ci, ipos, tag, index1, index2, (const char *)utf8, len); |
| 688 | } |
| 689 | |
| 690 | if (ci->call_name != NULL || ci->return_name != NULL) { |
| 691 | if ( ci->number != (ci->number & 0x7FFF) ) { |
| 692 | ci->class_number_index = |
| 693 | add_new_cpool_entry(ci, JVM_CONSTANT_Integer, |
| 694 | (ci->number>>16) & 0xFFFF, ci->number & 0xFFFF, NULL, 0); |
| 695 | } |
| 696 | } |
| 697 | |
| 698 | if ( ci->tclass_name != NULL ) { |
| 699 | ci->tracker_class_index = |
| 700 | add_new_class_cpool_entry(ci, ci->tclass_name); |
| 701 | } |
| 702 | if (ci->obj_init_name != NULL) { |
| 703 | ci->object_init_tracker_index = add_new_method_cpool_entry(ci, |
| 704 | ci->tracker_class_index, |
| 705 | ci->obj_init_name, |
| 706 | ci->obj_init_sig); |
| 707 | } |
| 708 | if (ci->newarray_name != NULL) { |
| 709 | ci->newarray_tracker_index = add_new_method_cpool_entry(ci, |
| 710 | ci->tracker_class_index, |
| 711 | ci->newarray_name, |
| 712 | ci->newarray_sig); |
| 713 | } |
| 714 | if (ci->call_name != NULL) { |
| 715 | ci->call_tracker_index = add_new_method_cpool_entry(ci, |
| 716 | ci->tracker_class_index, |
| 717 | ci->call_name, |
| 718 | ci->call_sig); |
| 719 | } |
| 720 | if (ci->return_name != NULL) { |
| 721 | ci->return_tracker_index = add_new_method_cpool_entry(ci, |
| 722 | ci->tracker_class_index, |
| 723 | ci->return_name, |
| 724 | ci->return_sig); |
| 725 | } |
| 726 | |
| 727 | random_writeU2(ci, cpool_output_position, ci->cpool_count_plus_one); |
| 728 | } |
| 729 | |
| 730 | /* ----------------------------------------------------------------- */ |
| 731 | /* Functions that create the bytecodes to inject */ |
| 732 | |
| 733 | static ByteOffset |
| 734 | push_pool_constant_bytecodes(ByteCode *bytecodes, CrwCpoolIndex index) |
| 735 | { |
| 736 | ByteOffset nbytes = 0; |
| 737 | |
| 738 | if ( index == (index&0x7F) ) { |
| 739 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_ldc; |
| 740 | } else { |
| 741 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_ldc_w; |
| 742 | bytecodes[nbytes++] = (ByteCode)((index >> 8) & 0xFF); |
| 743 | } |
| 744 | bytecodes[nbytes++] = (ByteCode)(index & 0xFF); |
| 745 | return nbytes; |
| 746 | } |
| 747 | |
| 748 | static ByteOffset |
| 749 | push_short_constant_bytecodes(ByteCode *bytecodes, unsigned number) |
| 750 | { |
| 751 | ByteOffset nbytes = 0; |
| 752 | |
| 753 | if ( number <= 5 ) { |
| 754 | bytecodes[nbytes++] = (ByteCode)(JVM_OPC_iconst_0+number); |
| 755 | } else if ( number == (number&0x7F) ) { |
| 756 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_bipush; |
| 757 | bytecodes[nbytes++] = (ByteCode)(number & 0xFF); |
| 758 | } else { |
| 759 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_sipush; |
| 760 | bytecodes[nbytes++] = (ByteCode)((number >> 8) & 0xFF); |
| 761 | bytecodes[nbytes++] = (ByteCode)(number & 0xFF); |
| 762 | } |
| 763 | return nbytes; |
| 764 | } |
| 765 | |
| 766 | static ByteOffset |
| 767 | injection_template(MethodImage *mi, ByteCode *bytecodes, ByteOffset max_nbytes, |
| 768 | CrwCpoolIndex method_index) |
| 769 | { |
| 770 | CrwClassImage * ci; |
| 771 | ByteOffset nbytes = 0; |
| 772 | unsigned max_stack; |
| 773 | int add_dup; |
| 774 | int add_aload; |
| 775 | int push_cnum; |
| 776 | int push_mnum; |
| 777 | |
| 778 | ci = mi->ci; |
| 779 | |
| 780 | CRW_ASSERT(ci, bytecodes!=NULL); |
| 781 | |
| 782 | if ( method_index == 0 ) { |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | if ( method_index == ci->newarray_tracker_index) { |
| 787 | max_stack = mi->max_stack + 1; |
| 788 | add_dup = JNI_TRUE; |
| 789 | add_aload = JNI_FALSE; |
| 790 | push_cnum = JNI_FALSE; |
| 791 | push_mnum = JNI_FALSE; |
| 792 | } else if ( method_index == ci->object_init_tracker_index) { |
| 793 | max_stack = mi->max_stack + 1; |
| 794 | add_dup = JNI_FALSE; |
| 795 | add_aload = JNI_TRUE; |
| 796 | push_cnum = JNI_FALSE; |
| 797 | push_mnum = JNI_FALSE; |
| 798 | } else { |
| 799 | max_stack = mi->max_stack + 2; |
| 800 | add_dup = JNI_FALSE; |
| 801 | add_aload = JNI_FALSE; |
| 802 | push_cnum = JNI_TRUE; |
| 803 | push_mnum = JNI_TRUE; |
| 804 | } |
| 805 | |
| 806 | if ( add_dup ) { |
| 807 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_dup; |
| 808 | } |
| 809 | if ( add_aload ) { |
| 810 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_aload_0; |
| 811 | } |
| 812 | if ( push_cnum ) { |
| 813 | if ( ci->number == (ci->number & 0x7FFF) ) { |
| 814 | nbytes += push_short_constant_bytecodes(bytecodes+nbytes, |
| 815 | ci->number); |
| 816 | } else { |
| 817 | CRW_ASSERT(ci, ci->class_number_index!=0); |
| 818 | nbytes += push_pool_constant_bytecodes(bytecodes+nbytes, |
| 819 | ci->class_number_index); |
| 820 | } |
| 821 | } |
| 822 | if ( push_mnum ) { |
| 823 | nbytes += push_short_constant_bytecodes(bytecodes+nbytes, |
| 824 | mi->number); |
| 825 | } |
| 826 | bytecodes[nbytes++] = (ByteCode)JVM_OPC_invokestatic; |
| 827 | bytecodes[nbytes++] = (ByteCode)(method_index >> 8); |
| 828 | bytecodes[nbytes++] = (ByteCode)method_index; |
| 829 | bytecodes[nbytes] = 0; |
| 830 | CRW_ASSERT(ci, nbytes<max_nbytes); |
| 831 | |
| 832 | /* Make sure the new max_stack is appropriate */ |
| 833 | if ( max_stack > mi->new_max_stack ) { |
| 834 | mi->new_max_stack = max_stack; |
| 835 | } |
| 836 | return nbytes; |
| 837 | } |
| 838 | |
| 839 | /* Called to create injection code at entry to a method */ |
| 840 | static ByteOffset |
| 841 | entry_injection_code(MethodImage *mi, ByteCode *bytecodes, ByteOffset len) |
| 842 | { |
| 843 | CrwClassImage * ci; |
| 844 | ByteOffset nbytes = 0; |
| 845 | |
| 846 | CRW_ASSERT_MI(mi); |
| 847 | |
| 848 | ci = mi->ci; |
| 849 | |
| 850 | if ( mi->object_init_method ) { |
| 851 | nbytes = injection_template(mi, |
| 852 | bytecodes, len, ci->object_init_tracker_index); |
| 853 | } |
| 854 | if ( !mi->skip_call_return_sites ) { |
| 855 | nbytes += injection_template(mi, |
| 856 | bytecodes+nbytes, len-nbytes, ci->call_tracker_index); |
| 857 | } |
| 858 | return nbytes; |
| 859 | } |
| 860 | |
| 861 | /* Called to create injection code before an opcode */ |
| 862 | static ByteOffset |
| 863 | before_injection_code(MethodImage *mi, ClassOpcode opcode, |
| 864 | ByteCode *bytecodes, ByteOffset len) |
| 865 | { |
| 866 | ByteOffset nbytes = 0; |
| 867 | |
| 868 | |
| 869 | CRW_ASSERT_MI(mi); |
| 870 | switch ( opcode ) { |
| 871 | case JVM_OPC_return: |
| 872 | case JVM_OPC_ireturn: |
| 873 | case JVM_OPC_lreturn: |
| 874 | case JVM_OPC_freturn: |
| 875 | case JVM_OPC_dreturn: |
| 876 | case JVM_OPC_areturn: |
| 877 | if ( !mi->skip_call_return_sites ) { |
| 878 | nbytes = injection_template(mi, |
| 879 | bytecodes, len, mi->ci->return_tracker_index); |
| 880 | } |
| 881 | break; |
| 882 | default: |
| 883 | break; |
| 884 | } |
| 885 | return nbytes; |
| 886 | } |
| 887 | |
| 888 | /* Called to create injection code after an opcode */ |
| 889 | static ByteOffset |
| 890 | after_injection_code(MethodImage *mi, ClassOpcode opcode, |
| 891 | ByteCode *bytecodes, ByteOffset len) |
| 892 | { |
| 893 | CrwClassImage* ci; |
| 894 | ByteOffset nbytes; |
| 895 | |
| 896 | ci = mi->ci; |
| 897 | nbytes = 0; |
| 898 | |
| 899 | CRW_ASSERT_MI(mi); |
| 900 | switch ( opcode ) { |
| 901 | case JVM_OPC_new: |
| 902 | /* Can't inject here cannot pass around uninitialized object */ |
| 903 | break; |
| 904 | case JVM_OPC_newarray: |
| 905 | case JVM_OPC_anewarray: |
| 906 | case JVM_OPC_multianewarray: |
| 907 | nbytes = injection_template(mi, |
| 908 | bytecodes, len, ci->newarray_tracker_index); |
| 909 | break; |
| 910 | default: |
| 911 | break; |
| 912 | } |
| 913 | return nbytes; |
| 914 | } |
| 915 | |
| 916 | /* Actually inject the bytecodes */ |
| 917 | static void |
| 918 | inject_bytecodes(MethodImage *mi, ByteOffset at, |
| 919 | ByteCode *bytecodes, ByteOffset len) |
| 920 | { |
| 921 | Injection injection; |
| 922 | CrwClassImage *ci; |
| 923 | |
| 924 | ci = mi->ci; |
| 925 | CRW_ASSERT_MI(mi); |
| 926 | CRW_ASSERT(ci, at <= mi->code_len); |
| 927 | |
| 928 | injection = mi->injections[at]; |
| 929 | |
| 930 | CRW_ASSERT(ci, len <= LARGEST_INJECTION/2); |
| 931 | CRW_ASSERT(ci, injection.len+len <= LARGEST_INJECTION); |
| 932 | |
| 933 | /* Either start an injection area or concatenate to what is there */ |
| 934 | if ( injection.code == NULL ) { |
| 935 | CRW_ASSERT(ci, injection.len==0); |
| 936 | injection.code = (ByteCode *)allocate_clean(ci, LARGEST_INJECTION+1); |
| 937 | } |
| 938 | |
| 939 | (void)memcpy(injection.code+injection.len, bytecodes, len); |
| 940 | injection.len += len; |
| 941 | injection.code[injection.len] = 0; |
| 942 | mi->injections[at] = injection; |
| 943 | ci->injection_count++; |
| 944 | } |
| 945 | |
| 946 | /* ----------------------------------------------------------------- */ |
| 947 | /* Method handling functions */ |
| 948 | |
| 949 | static MethodImage * |
| 950 | method_init(CrwClassImage *ci, unsigned mnum, ByteOffset code_len) |
| 951 | { |
| 952 | MethodImage * mi; |
| 953 | ByteOffset i; |
| 954 | |
| 955 | mi = (MethodImage*)allocate_clean(ci, (int)sizeof(MethodImage)); |
| 956 | mi->ci = ci; |
| 957 | mi->name = ci->method_name[mnum]; |
| 958 | mi->descr = ci->method_descr[mnum]; |
| 959 | mi->code_len = code_len; |
| 960 | mi->map = (ByteOffset*)allocate_clean(ci, |
| 961 | (int)((code_len+1)*sizeof(ByteOffset))); |
| 962 | for(i=0; i<=code_len; i++) { |
| 963 | mi->map[i] = i; |
| 964 | } |
| 965 | mi->widening = (signed char*)allocate_clean(ci, code_len+1); |
| 966 | mi->injections = (Injection *)allocate_clean(ci, |
| 967 | (int)((code_len+1)*sizeof(Injection))); |
| 968 | mi->number = mnum; |
| 969 | ci->current_mi = mi; |
| 970 | return mi; |
| 971 | } |
| 972 | |
| 973 | static void |
| 974 | method_term(MethodImage *mi) |
| 975 | { |
| 976 | CrwClassImage *ci; |
| 977 | |
| 978 | ci = mi->ci; |
| 979 | CRW_ASSERT_MI(mi); |
| 980 | if ( mi->map != NULL ) { |
| 981 | deallocate(ci, (void*)mi->map); |
| 982 | mi->map = NULL; |
| 983 | } |
| 984 | if ( mi->widening != NULL ) { |
| 985 | deallocate(ci, (void*)mi->widening); |
| 986 | mi->widening = NULL; |
| 987 | } |
| 988 | if ( mi->injections != NULL ) { |
| 989 | ByteOffset i; |
| 990 | for(i=0; i<= mi->code_len; i++) { |
| 991 | if ( mi->injections[i].code != NULL ) { |
| 992 | deallocate(ci, (void*)mi->injections[i].code); |
| 993 | mi->injections[i].code = NULL; |
| 994 | } |
| 995 | } |
| 996 | deallocate(ci, (void*)mi->injections); |
| 997 | mi->injections = NULL; |
| 998 | } |
| 999 | ci->current_mi = NULL; |
| 1000 | deallocate(ci, (void*)mi); |
| 1001 | } |
| 1002 | |
| 1003 | static ByteOffset |
| 1004 | input_code_offset(MethodImage *mi) |
| 1005 | { |
| 1006 | CRW_ASSERT_MI(mi); |
| 1007 | return (ByteOffset)(mi->ci->input_position - mi->start_of_input_bytecodes); |
| 1008 | } |
| 1009 | |
| 1010 | static void |
| 1011 | rewind_to_beginning_of_input_bytecodes(MethodImage *mi) |
| 1012 | { |
| 1013 | CRW_ASSERT_MI(mi); |
| 1014 | mi->ci->input_position = mi->start_of_input_bytecodes; |
| 1015 | } |
| 1016 | |
| 1017 | /* Starting at original byte position 'at', add 'offset' to it's new |
| 1018 | * location. This may be a negative value. |
| 1019 | * NOTE: That this map is not the new bytecode location of the opcode |
| 1020 | * but the new bytecode location that should be used when |
| 1021 | * a goto or jump instruction was targeting the old bytecode |
| 1022 | * location. |
| 1023 | */ |
| 1024 | static void |
| 1025 | adjust_map(MethodImage *mi, ByteOffset at, ByteOffset offset) |
| 1026 | { |
| 1027 | ByteOffset i; |
| 1028 | |
| 1029 | CRW_ASSERT_MI(mi); |
| 1030 | for (i = at; i <= mi->code_len; ++i) { |
| 1031 | mi->map[i] += offset; |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | static void |
| 1036 | widen(MethodImage *mi, ByteOffset at, ByteOffset len) |
| 1037 | { |
| 1038 | int delta; |
| 1039 | |
| 1040 | CRW_ASSERT(mi->ci, at <= mi->code_len); |
| 1041 | delta = len - mi->widening[at]; |
| 1042 | /* Adjust everything from the current input location by delta */ |
| 1043 | adjust_map(mi, input_code_offset(mi), delta); |
| 1044 | /* Mark at beginning of instruction */ |
| 1045 | mi->widening[at] = (signed char)len; |
| 1046 | } |
| 1047 | |
| 1048 | static void |
| 1049 | verify_opc_wide(CrwClassImage *ci, ClassOpcode wopcode) |
| 1050 | { |
| 1051 | switch (wopcode) { |
| 1052 | case JVM_OPC_aload: case JVM_OPC_astore: |
| 1053 | case JVM_OPC_fload: case JVM_OPC_fstore: |
| 1054 | case JVM_OPC_iload: case JVM_OPC_istore: |
| 1055 | case JVM_OPC_lload: case JVM_OPC_lstore: |
| 1056 | case JVM_OPC_dload: case JVM_OPC_dstore: |
| 1057 | case JVM_OPC_ret: case JVM_OPC_iinc: |
| 1058 | break; |
| 1059 | default: |
| 1060 | CRW_FATAL(ci, "Invalid opcode supplied to wide opcode"); |
| 1061 | break; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | static unsigned |
| 1066 | opcode_length(CrwClassImage *ci, ClassOpcode opcode) |
| 1067 | { |
| 1068 | /* Define array that holds length of an opcode */ |
| 1069 | static unsigned char _opcode_length[JVM_OPC_MAX+1] = |
| 1070 | JVM_OPCODE_LENGTH_INITIALIZER; |
| 1071 | |
| 1072 | if ( opcode > JVM_OPC_MAX ) { |
| 1073 | CRW_FATAL(ci, "Invalid opcode supplied to opcode_length()"); |
| 1074 | } |
| 1075 | return _opcode_length[opcode]; |
| 1076 | } |
| 1077 | |
| 1078 | /* Walk one instruction and inject instrumentation */ |
| 1079 | static void |
| 1080 | inject_for_opcode(MethodImage *mi) |
| 1081 | { |
| 1082 | CrwClassImage * ci; |
| 1083 | ClassOpcode opcode; |
| 1084 | int pos; |
| 1085 | |
| 1086 | CRW_ASSERT_MI(mi); |
| 1087 | ci = mi->ci; |
| 1088 | pos = input_code_offset(mi); |
| 1089 | opcode = readU1(ci); |
| 1090 | |
| 1091 | if (opcode == JVM_OPC_wide) { |
| 1092 | ClassOpcode wopcode; |
| 1093 | |
| 1094 | wopcode = readU1(ci); |
| 1095 | /* lvIndex not used */ |
| 1096 | (void)readU2(ci); |
| 1097 | verify_opc_wide(ci, wopcode); |
| 1098 | if ( wopcode==JVM_OPC_iinc ) { |
| 1099 | (void)readU1(ci); |
| 1100 | (void)readU1(ci); |
| 1101 | } |
| 1102 | } else { |
| 1103 | |
| 1104 | ByteCode bytecodes[LARGEST_INJECTION+1]; |
| 1105 | int header; |
| 1106 | int instr_len; |
| 1107 | int low; |
| 1108 | int high; |
| 1109 | int npairs; |
| 1110 | ByteOffset len; |
| 1111 | |
| 1112 | /* Get bytecodes to inject before this opcode */ |
| 1113 | len = before_injection_code(mi, opcode, bytecodes, (int)sizeof(bytecodes)); |
| 1114 | if ( len > 0 ) { |
| 1115 | inject_bytecodes(mi, pos, bytecodes, len); |
| 1116 | /* Adjust map after processing this opcode */ |
| 1117 | } |
| 1118 | |
| 1119 | /* Process this opcode */ |
| 1120 | switch (opcode) { |
| 1121 | case JVM_OPC_tableswitch: |
| 1122 | header = NEXT_4BYTE_BOUNDARY(pos); |
| 1123 | skip(ci, header - (pos+1)); |
| 1124 | (void)readU4(ci); |
| 1125 | low = readU4(ci); |
| 1126 | high = readU4(ci); |
| 1127 | skip(ci, (high+1-low) * 4); |
| 1128 | break; |
| 1129 | case JVM_OPC_lookupswitch: |
| 1130 | header = NEXT_4BYTE_BOUNDARY(pos); |
| 1131 | skip(ci, header - (pos+1)); |
| 1132 | (void)readU4(ci); |
| 1133 | npairs = readU4(ci); |
| 1134 | skip(ci, npairs * 8); |
| 1135 | break; |
| 1136 | default: |
| 1137 | instr_len = opcode_length(ci, opcode); |
| 1138 | skip(ci, instr_len-1); |
| 1139 | break; |
| 1140 | } |
| 1141 | |
| 1142 | /* Get position after this opcode is processed */ |
| 1143 | pos = input_code_offset(mi); |
| 1144 | |
| 1145 | /* Adjust for any before_injection_code() */ |
| 1146 | if ( len > 0 ) { |
| 1147 | /* Adjust everything past this opcode. |
| 1148 | * Why past it? Because we want any jumps to this bytecode loc |
| 1149 | * to go to the injected code, not where the opcode |
| 1150 | * was moved too. |
| 1151 | * Consider a 'return' opcode that is jumped too. |
| 1152 | * NOTE: This may not be correct in all cases, but will |
| 1153 | * when we are only dealing with non-variable opcodes |
| 1154 | * like the return opcodes. Be careful if the |
| 1155 | * before_injection_code() changes to include other |
| 1156 | * opcodes that have variable length. |
| 1157 | */ |
| 1158 | adjust_map(mi, pos, len); |
| 1159 | } |
| 1160 | |
| 1161 | /* Get bytecodes to inject after this opcode */ |
| 1162 | len = after_injection_code(mi, opcode, bytecodes, (int)sizeof(bytecodes)); |
| 1163 | if ( len > 0 ) { |
| 1164 | inject_bytecodes(mi, pos, bytecodes, len); |
| 1165 | |
| 1166 | /* Adjust for any after_injection_code() */ |
| 1167 | adjust_map(mi, pos, len); |
| 1168 | } |
| 1169 | |
| 1170 | } |
| 1171 | } |
| 1172 | |
| 1173 | /* Map original bytecode location to it's new location. (See adjust_map()). */ |
| 1174 | static ByteOffset |
| 1175 | method_code_map(MethodImage *mi, ByteOffset pos) |
| 1176 | { |
| 1177 | CRW_ASSERT_MI(mi); |
| 1178 | CRW_ASSERT(mi->ci, pos <= mi->code_len); |
| 1179 | return mi->map[pos]; |
| 1180 | } |
| 1181 | |
| 1182 | static int |
| 1183 | adjust_instruction(MethodImage *mi) |
| 1184 | { |
| 1185 | CrwClassImage * ci; |
| 1186 | ClassOpcode opcode; |
| 1187 | int pos; |
| 1188 | int new_pos; |
| 1189 | |
| 1190 | CRW_ASSERT_MI(mi); |
| 1191 | ci = mi->ci; |
| 1192 | pos = input_code_offset(mi); |
| 1193 | new_pos = method_code_map(mi,pos); |
| 1194 | |
| 1195 | opcode = readU1(ci); |
| 1196 | |
| 1197 | if (opcode == JVM_OPC_wide) { |
| 1198 | ClassOpcode wopcode; |
| 1199 | |
| 1200 | wopcode = readU1(ci); |
| 1201 | /* lvIndex not used */ |
| 1202 | (void)readU2(ci); |
| 1203 | verify_opc_wide(ci, wopcode); |
| 1204 | if ( wopcode==JVM_OPC_iinc ) { |
| 1205 | (void)readU1(ci); |
| 1206 | (void)readU1(ci); |
| 1207 | } |
| 1208 | } else { |
| 1209 | |
| 1210 | int widened; |
| 1211 | int header; |
| 1212 | int newHeader; |
| 1213 | int low; |
| 1214 | int high; |
| 1215 | int new_pad; |
| 1216 | int old_pad; |
| 1217 | int delta; |
| 1218 | int new_delta; |
| 1219 | int delta_pad; |
| 1220 | int npairs; |
| 1221 | int instr_len; |
| 1222 | |
| 1223 | switch (opcode) { |
| 1224 | |
| 1225 | case JVM_OPC_tableswitch: |
| 1226 | widened = mi->widening[pos]; |
| 1227 | header = NEXT_4BYTE_BOUNDARY(pos); |
| 1228 | newHeader = NEXT_4BYTE_BOUNDARY(new_pos); |
| 1229 | |
| 1230 | skip(ci, header - (pos+1)); |
| 1231 | |
| 1232 | delta = readU4(ci); |
| 1233 | low = readU4(ci); |
| 1234 | high = readU4(ci); |
| 1235 | skip(ci, (high+1-low) * 4); |
| 1236 | new_pad = newHeader - new_pos; |
| 1237 | old_pad = header - pos; |
| 1238 | delta_pad = new_pad - old_pad; |
| 1239 | if (widened != delta_pad) { |
| 1240 | widen(mi, pos, delta_pad); |
| 1241 | return 0; |
| 1242 | } |
| 1243 | break; |
| 1244 | |
| 1245 | case JVM_OPC_lookupswitch: |
| 1246 | widened = mi->widening[pos]; |
| 1247 | header = NEXT_4BYTE_BOUNDARY(pos); |
| 1248 | newHeader = NEXT_4BYTE_BOUNDARY(new_pos); |
| 1249 | |
| 1250 | skip(ci, header - (pos+1)); |
| 1251 | |
| 1252 | delta = readU4(ci); |
| 1253 | npairs = readU4(ci); |
| 1254 | skip(ci, npairs * 8); |
| 1255 | new_pad = newHeader - new_pos; |
| 1256 | old_pad = header - pos; |
| 1257 | delta_pad = new_pad - old_pad; |
| 1258 | if (widened != delta_pad) { |
| 1259 | widen(mi, pos, delta_pad); |
| 1260 | return 0; |
| 1261 | } |
| 1262 | break; |
| 1263 | |
| 1264 | case JVM_OPC_jsr: case JVM_OPC_goto: |
| 1265 | case JVM_OPC_ifeq: case JVM_OPC_ifge: case JVM_OPC_ifgt: |
| 1266 | case JVM_OPC_ifle: case JVM_OPC_iflt: case JVM_OPC_ifne: |
| 1267 | case JVM_OPC_if_icmpeq: case JVM_OPC_if_icmpne: case JVM_OPC_if_icmpge: |
| 1268 | case JVM_OPC_if_icmpgt: case JVM_OPC_if_icmple: case JVM_OPC_if_icmplt: |
| 1269 | case JVM_OPC_if_acmpeq: case JVM_OPC_if_acmpne: |
| 1270 | case JVM_OPC_ifnull: case JVM_OPC_ifnonnull: |
| 1271 | widened = mi->widening[pos]; |
| 1272 | delta = readS2(ci); |
| 1273 | if (widened == 0) { |
| 1274 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1275 | if ((new_delta < -32768) || (new_delta > 32767)) { |
| 1276 | switch (opcode) { |
| 1277 | case JVM_OPC_jsr: case JVM_OPC_goto: |
| 1278 | widen(mi, pos, 2); |
| 1279 | break; |
| 1280 | default: |
| 1281 | widen(mi, pos, 5); |
| 1282 | break; |
| 1283 | } |
| 1284 | return 0; |
| 1285 | } |
| 1286 | } |
| 1287 | break; |
| 1288 | |
| 1289 | case JVM_OPC_jsr_w: |
| 1290 | case JVM_OPC_goto_w: |
| 1291 | (void)readU4(ci); |
| 1292 | break; |
| 1293 | |
| 1294 | default: |
| 1295 | instr_len = opcode_length(ci, opcode); |
| 1296 | skip(ci, instr_len-1); |
| 1297 | break; |
| 1298 | } |
| 1299 | } |
| 1300 | return 1; |
| 1301 | } |
| 1302 | |
| 1303 | static void |
| 1304 | write_instruction(MethodImage *mi) |
| 1305 | { |
| 1306 | CrwClassImage * ci; |
| 1307 | ClassOpcode opcode; |
| 1308 | ByteOffset new_code_len; |
| 1309 | int pos; |
| 1310 | int new_pos; |
| 1311 | |
| 1312 | CRW_ASSERT_MI(mi); |
| 1313 | ci = mi->ci; |
| 1314 | pos = input_code_offset(mi); |
| 1315 | new_pos = method_code_map(mi,pos); |
| 1316 | new_code_len = mi->injections[pos].len; |
| 1317 | if (new_code_len > 0) { |
| 1318 | write_bytes(ci, (void*)mi->injections[pos].code, new_code_len); |
| 1319 | } |
| 1320 | |
| 1321 | opcode = readU1(ci); |
| 1322 | if (opcode == JVM_OPC_wide) { |
| 1323 | ClassOpcode wopcode; |
| 1324 | |
| 1325 | writeU1(ci, opcode); |
| 1326 | |
| 1327 | wopcode = copyU1(ci); |
| 1328 | /* lvIndex not used */ |
| 1329 | (void)copyU2(ci); |
| 1330 | verify_opc_wide(ci, wopcode); |
| 1331 | if ( wopcode==JVM_OPC_iinc ) { |
| 1332 | (void)copyU1(ci); |
| 1333 | (void)copyU1(ci); |
| 1334 | } |
| 1335 | } else { |
| 1336 | |
| 1337 | ClassOpcode new_opcode; |
| 1338 | int header; |
| 1339 | int newHeader; |
| 1340 | int low; |
| 1341 | int high; |
| 1342 | int i; |
| 1343 | int npairs; |
| 1344 | int widened; |
| 1345 | int instr_len; |
| 1346 | int delta; |
| 1347 | int new_delta; |
| 1348 | |
| 1349 | switch (opcode) { |
| 1350 | |
| 1351 | case JVM_OPC_tableswitch: |
| 1352 | header = NEXT_4BYTE_BOUNDARY(pos); |
| 1353 | newHeader = NEXT_4BYTE_BOUNDARY(new_pos); |
| 1354 | |
| 1355 | skip(ci, header - (pos+1)); |
| 1356 | |
| 1357 | delta = readU4(ci); |
| 1358 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1359 | low = readU4(ci); |
| 1360 | high = readU4(ci); |
| 1361 | |
| 1362 | writeU1(ci, opcode); |
| 1363 | for (i = new_pos+1; i < newHeader; ++i) { |
| 1364 | writeU1(ci, 0); |
| 1365 | } |
| 1366 | writeU4(ci, new_delta); |
| 1367 | writeU4(ci, low); |
| 1368 | writeU4(ci, high); |
| 1369 | |
| 1370 | for (i = low; i <= high; ++i) { |
| 1371 | delta = readU4(ci); |
| 1372 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1373 | writeU4(ci, new_delta); |
| 1374 | } |
| 1375 | break; |
| 1376 | |
| 1377 | case JVM_OPC_lookupswitch: |
| 1378 | header = NEXT_4BYTE_BOUNDARY(pos); |
| 1379 | newHeader = NEXT_4BYTE_BOUNDARY(new_pos); |
| 1380 | |
| 1381 | skip(ci, header - (pos+1)); |
| 1382 | |
| 1383 | delta = readU4(ci); |
| 1384 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1385 | npairs = readU4(ci); |
| 1386 | writeU1(ci, opcode); |
| 1387 | for (i = new_pos+1; i < newHeader; ++i) { |
| 1388 | writeU1(ci, 0); |
| 1389 | } |
| 1390 | writeU4(ci, new_delta); |
| 1391 | writeU4(ci, npairs); |
| 1392 | for (i = 0; i< npairs; ++i) { |
| 1393 | unsigned match = readU4(ci); |
| 1394 | delta = readU4(ci); |
| 1395 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1396 | writeU4(ci, match); |
| 1397 | writeU4(ci, new_delta); |
| 1398 | } |
| 1399 | break; |
| 1400 | |
| 1401 | case JVM_OPC_jsr: case JVM_OPC_goto: |
| 1402 | case JVM_OPC_ifeq: case JVM_OPC_ifge: case JVM_OPC_ifgt: |
| 1403 | case JVM_OPC_ifle: case JVM_OPC_iflt: case JVM_OPC_ifne: |
| 1404 | case JVM_OPC_if_icmpeq: case JVM_OPC_if_icmpne: case JVM_OPC_if_icmpge: |
| 1405 | case JVM_OPC_if_icmpgt: case JVM_OPC_if_icmple: case JVM_OPC_if_icmplt: |
| 1406 | case JVM_OPC_if_acmpeq: case JVM_OPC_if_acmpne: |
| 1407 | case JVM_OPC_ifnull: case JVM_OPC_ifnonnull: |
| 1408 | widened = mi->widening[pos]; |
| 1409 | delta = readS2(ci); |
| 1410 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1411 | new_opcode = opcode; |
| 1412 | if (widened == 0) { |
| 1413 | writeU1(ci, opcode); |
| 1414 | writeU2(ci, new_delta); |
| 1415 | } else if (widened == 2) { |
| 1416 | switch (opcode) { |
| 1417 | case JVM_OPC_jsr: |
| 1418 | new_opcode = JVM_OPC_jsr_w; |
| 1419 | break; |
| 1420 | case JVM_OPC_goto: |
| 1421 | new_opcode = JVM_OPC_goto_w; |
| 1422 | break; |
| 1423 | default: |
| 1424 | CRW_FATAL(ci, "unexpected opcode"); |
| 1425 | break; |
| 1426 | } |
| 1427 | writeU1(ci, new_opcode); |
| 1428 | writeU4(ci, new_delta); |
| 1429 | } else if (widened == 5) { |
| 1430 | switch (opcode) { |
| 1431 | case JVM_OPC_ifeq: |
| 1432 | new_opcode = JVM_OPC_ifne; |
| 1433 | break; |
| 1434 | case JVM_OPC_ifge: |
| 1435 | new_opcode = JVM_OPC_iflt; |
| 1436 | break; |
| 1437 | case JVM_OPC_ifgt: |
| 1438 | new_opcode = JVM_OPC_ifle; |
| 1439 | break; |
| 1440 | case JVM_OPC_ifle: |
| 1441 | new_opcode = JVM_OPC_ifgt; |
| 1442 | break; |
| 1443 | case JVM_OPC_iflt: |
| 1444 | new_opcode = JVM_OPC_ifge; |
| 1445 | break; |
| 1446 | case JVM_OPC_ifne: |
| 1447 | new_opcode = JVM_OPC_ifeq; |
| 1448 | break; |
| 1449 | case JVM_OPC_if_icmpeq: |
| 1450 | new_opcode = JVM_OPC_if_icmpne; |
| 1451 | break; |
| 1452 | case JVM_OPC_if_icmpne: |
| 1453 | new_opcode = JVM_OPC_if_icmpeq; |
| 1454 | break; |
| 1455 | case JVM_OPC_if_icmpge: |
| 1456 | new_opcode = JVM_OPC_if_icmplt; |
| 1457 | break; |
| 1458 | case JVM_OPC_if_icmpgt: |
| 1459 | new_opcode = JVM_OPC_if_icmple; |
| 1460 | break; |
| 1461 | case JVM_OPC_if_icmple: |
| 1462 | new_opcode = JVM_OPC_if_icmpgt; |
| 1463 | break; |
| 1464 | case JVM_OPC_if_icmplt: |
| 1465 | new_opcode = JVM_OPC_if_icmpge; |
| 1466 | break; |
| 1467 | case JVM_OPC_if_acmpeq: |
| 1468 | new_opcode = JVM_OPC_if_acmpne; |
| 1469 | break; |
| 1470 | case JVM_OPC_if_acmpne: |
| 1471 | new_opcode = JVM_OPC_if_acmpeq; |
| 1472 | break; |
| 1473 | case JVM_OPC_ifnull: |
| 1474 | new_opcode = JVM_OPC_ifnonnull; |
| 1475 | break; |
| 1476 | case JVM_OPC_ifnonnull: |
| 1477 | new_opcode = JVM_OPC_ifnull; |
| 1478 | break; |
| 1479 | default: |
| 1480 | CRW_FATAL(ci, "Unexpected opcode"); |
| 1481 | break; |
| 1482 | } |
| 1483 | writeU1(ci, new_opcode); /* write inverse branch */ |
| 1484 | writeU2(ci, 3 + 5); /* beyond if and goto_w */ |
| 1485 | writeU1(ci, JVM_OPC_goto_w); /* add a goto_w */ |
| 1486 | writeU4(ci, new_delta-3); /* write new and wide delta */ |
| 1487 | } else { |
| 1488 | CRW_FATAL(ci, "Unexpected widening"); |
| 1489 | } |
| 1490 | break; |
| 1491 | |
| 1492 | case JVM_OPC_jsr_w: |
| 1493 | case JVM_OPC_goto_w: |
| 1494 | delta = readU4(ci); |
| 1495 | new_delta = method_code_map(mi,pos+delta) - new_pos; |
| 1496 | writeU1(ci, opcode); |
| 1497 | writeU4(ci, new_delta); |
| 1498 | break; |
| 1499 | |
| 1500 | default: |
| 1501 | instr_len = opcode_length(ci, opcode); |
| 1502 | writeU1(ci, opcode); |
| 1503 | copy(ci, instr_len-1); |
| 1504 | break; |
| 1505 | } |
| 1506 | } |
| 1507 | } |
| 1508 | |
| 1509 | static void |
| 1510 | method_inject_and_write_code(MethodImage *mi) |
| 1511 | { |
| 1512 | ByteCode bytecodes[LARGEST_INJECTION+1]; |
| 1513 | ByteOffset len; |
| 1514 | |
| 1515 | CRW_ASSERT_MI(mi); |
| 1516 | |
| 1517 | /* Do injections */ |
| 1518 | rewind_to_beginning_of_input_bytecodes(mi); |
| 1519 | len = entry_injection_code(mi, bytecodes, (int)sizeof(bytecodes)); |
| 1520 | if ( len > 0 ) { |
| 1521 | int pos; |
| 1522 | |
| 1523 | pos = 0; |
| 1524 | inject_bytecodes(mi, pos, bytecodes, len); |
| 1525 | /* Adjust pos 0 to map to new pos 0, you never want to |
| 1526 | * jump into this entry code injection. So the new pos 0 |
| 1527 | * will be past this entry_injection_code(). |
| 1528 | */ |
| 1529 | adjust_map(mi, pos, len); /* Inject before behavior */ |
| 1530 | } |
| 1531 | while (input_code_offset(mi) < mi->code_len) { |
| 1532 | inject_for_opcode(mi); |
| 1533 | } |
| 1534 | |
| 1535 | /* Adjust instructions */ |
| 1536 | rewind_to_beginning_of_input_bytecodes(mi); |
| 1537 | while (input_code_offset(mi) < mi->code_len) { |
| 1538 | if (!adjust_instruction(mi)) { |
| 1539 | rewind_to_beginning_of_input_bytecodes(mi); |
| 1540 | } |
| 1541 | } |
| 1542 | |
| 1543 | /* Write new instructions */ |
| 1544 | rewind_to_beginning_of_input_bytecodes(mi); |
| 1545 | while (input_code_offset(mi) < mi->code_len) { |
| 1546 | write_instruction(mi); |
| 1547 | } |
| 1548 | } |
| 1549 | |
| 1550 | static void |
| 1551 | copy_attribute(CrwClassImage *ci) |
| 1552 | { |
| 1553 | int len; |
| 1554 | |
| 1555 | (void)copyU2(ci); |
| 1556 | len = copyU4(ci); |
| 1557 | copy(ci, len); |
| 1558 | } |
| 1559 | |
| 1560 | static void |
| 1561 | copy_attributes(CrwClassImage *ci) |
| 1562 | { |
| 1563 | unsigned i; |
| 1564 | unsigned count; |
| 1565 | |
| 1566 | count = copyU2(ci); |
| 1567 | for (i = 0; i < count; ++i) { |
| 1568 | copy_attribute(ci); |
| 1569 | } |
| 1570 | } |
| 1571 | |
| 1572 | static void |
| 1573 | copy_all_fields(CrwClassImage *ci) |
| 1574 | { |
| 1575 | unsigned i; |
| 1576 | unsigned count; |
| 1577 | |
| 1578 | count = copyU2(ci); |
| 1579 | for (i = 0; i < count; ++i) { |
| 1580 | /* access, name, descriptor */ |
| 1581 | copy(ci, 6); |
| 1582 | copy_attributes(ci); |
| 1583 | } |
| 1584 | } |
| 1585 | |
| 1586 | static void |
| 1587 | write_line_table(MethodImage *mi) |
| 1588 | { |
| 1589 | unsigned i; |
| 1590 | unsigned count; |
| 1591 | CrwClassImage * ci; |
| 1592 | |
| 1593 | CRW_ASSERT_MI(mi); |
| 1594 | ci = mi->ci; |
| 1595 | (void)copyU4(ci); |
| 1596 | count = copyU2(ci); |
| 1597 | for(i=0; i<count; i++) { |
| 1598 | ByteOffset start_pc; |
| 1599 | ByteOffset new_start_pc; |
| 1600 | |
| 1601 | start_pc = readU2(ci); |
| 1602 | |
| 1603 | if ( start_pc == 0 ) { |
| 1604 | new_start_pc = 0; /* Don't skip entry injection code. */ |
| 1605 | } else { |
| 1606 | new_start_pc = method_code_map(mi, start_pc); |
| 1607 | } |
| 1608 | |
| 1609 | writeU2(ci, new_start_pc); |
| 1610 | (void)copyU2(ci); |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | /* Used for LocalVariableTable and LocalVariableTypeTable attributes */ |
| 1615 | static void |
| 1616 | write_var_table(MethodImage *mi) |
| 1617 | { |
| 1618 | unsigned i; |
| 1619 | unsigned count; |
| 1620 | CrwClassImage * ci; |
| 1621 | |
| 1622 | CRW_ASSERT_MI(mi); |
| 1623 | ci = mi->ci; |
| 1624 | (void)copyU4(ci); |
| 1625 | count = copyU2(ci); |
| 1626 | for(i=0; i<count; i++) { |
| 1627 | ByteOffset start_pc; |
| 1628 | ByteOffset new_start_pc; |
| 1629 | ByteOffset length; |
| 1630 | ByteOffset new_length; |
| 1631 | ByteOffset end_pc; |
| 1632 | ByteOffset new_end_pc; |
| 1633 | |
| 1634 | start_pc = readU2(ci); |
| 1635 | length = readU2(ci); |
| 1636 | |
| 1637 | if ( start_pc == 0 ) { |
| 1638 | new_start_pc = 0; /* Don't skip entry injection code. */ |
| 1639 | } else { |
| 1640 | new_start_pc = method_code_map(mi, start_pc); |
| 1641 | } |
| 1642 | end_pc = start_pc + length; |
| 1643 | new_end_pc = method_code_map(mi, end_pc); |
| 1644 | new_length = new_end_pc - new_start_pc; |
| 1645 | |
| 1646 | writeU2(ci, new_start_pc); |
| 1647 | writeU2(ci, new_length); |
| 1648 | (void)copyU2(ci); |
| 1649 | (void)copyU2(ci); |
| 1650 | (void)copyU2(ci); |
| 1651 | } |
| 1652 | } |
| 1653 | |
| 1654 | /* The uoffset field is u2 or u4 depending on the code_len. |
| 1655 | * Note that the code_len is likely changing, so be careful here. |
| 1656 | */ |
| 1657 | static unsigned |
| 1658 | readUoffset(MethodImage *mi) |
| 1659 | { |
| 1660 | if ( mi->code_len > 65535 ) { |
| 1661 | return readU4(mi->ci); |
| 1662 | } |
| 1663 | return readU2(mi->ci); |
| 1664 | } |
| 1665 | |
| 1666 | static void |
| 1667 | writeUoffset(MethodImage *mi, unsigned val) |
| 1668 | { |
| 1669 | if ( mi->new_code_len > 65535 ) { |
| 1670 | writeU4(mi->ci, val); |
| 1671 | } |
| 1672 | writeU2(mi->ci, val); |
| 1673 | } |
| 1674 | |
| 1675 | static unsigned |
| 1676 | copyUoffset(MethodImage *mi) |
| 1677 | { |
| 1678 | unsigned uoffset; |
| 1679 | |
| 1680 | uoffset = readUoffset(mi); |
| 1681 | writeUoffset(mi, uoffset); |
| 1682 | return uoffset; |
| 1683 | } |
| 1684 | |
| 1685 | /* Copy over verification_type_info structure */ |
| 1686 | static void |
| 1687 | copy_verification_types(MethodImage *mi, int ntypes) |
| 1688 | { |
| 1689 | /* If there were ntypes, we just copy that over, no changes */ |
| 1690 | if ( ntypes > 0 ) { |
| 1691 | int j; |
| 1692 | |
| 1693 | for ( j = 0 ; j < ntypes ; j++ ) { |
| 1694 | unsigned tag; |
| 1695 | |
| 1696 | tag = copyU1(mi->ci); |
| 1697 | switch ( tag ) { |
| 1698 | case JVM_ITEM_Object: |
| 1699 | (void)copyU2(mi->ci); /* Constant pool entry */ |
| 1700 | break; |
| 1701 | case JVM_ITEM_Uninitialized: |
| 1702 | /* Code offset for 'new' opcode is for this object */ |
| 1703 | writeUoffset(mi, method_code_map(mi, readUoffset(mi))); |
| 1704 | break; |
| 1705 | } |
| 1706 | } |
| 1707 | } |
| 1708 | } |
| 1709 | |
| 1710 | /* Process the StackMapTable attribute. We didn't add any basic blocks |
| 1711 | * so the frame count remains the same but we may need to process the |
| 1712 | * frame types due to offset changes putting things out of range. |
| 1713 | */ |
| 1714 | static void |
| 1715 | write_stackmap_table(MethodImage *mi) |
| 1716 | { |
| 1717 | CrwClassImage *ci; |
| 1718 | CrwPosition save_position; |
| 1719 | ByteOffset last_pc; |
| 1720 | ByteOffset last_new_pc; |
| 1721 | unsigned i; |
| 1722 | unsigned attr_len; |
| 1723 | unsigned new_attr_len; |
| 1724 | unsigned count; |
| 1725 | unsigned delta_adj; |
| 1726 | |
| 1727 | CRW_ASSERT_MI(mi); |
| 1728 | ci = mi->ci; |
| 1729 | |
| 1730 | /* Save the position of the attribute length so we can fix it later */ |
| 1731 | save_position = ci->output_position; |
| 1732 | attr_len = copyU4(ci); |
| 1733 | count = copyUoffset(mi); /* uoffset: number_of_entries */ |
| 1734 | if ( count == 0 ) { |
| 1735 | CRW_ASSERT(ci, attr_len==2); |
| 1736 | return; |
| 1737 | } |
| 1738 | |
| 1739 | /* Process entire stackmap */ |
| 1740 | last_pc = 0; |
| 1741 | last_new_pc = 0; |
| 1742 | delta_adj = 0; |
| 1743 | for ( i = 0 ; i < count ; i++ ) { |
| 1744 | ByteOffset new_pc=0; /* new pc in instrumented code */ |
| 1745 | unsigned ft; /* frame_type */ |
| 1746 | int delta=0; /* pc delta */ |
| 1747 | int new_delta=0; /* new pc delta */ |
| 1748 | |
| 1749 | ft = readU1(ci); |
| 1750 | if ( ft <= 63 ) { |
| 1751 | /* Frame Type: same_frame ([0,63]) */ |
| 1752 | unsigned new_ft; /* new frame_type */ |
| 1753 | |
| 1754 | delta = (delta_adj + ft); |
| 1755 | new_pc = method_code_map(mi, last_pc + delta); |
| 1756 | new_delta = new_pc - last_new_pc; |
| 1757 | new_ft = (new_delta - delta_adj); |
| 1758 | if ( new_ft > 63 ) { |
| 1759 | /* Change to same_frame_extended (251) */ |
| 1760 | new_ft = 251; |
| 1761 | writeU1(ci, new_ft); |
| 1762 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1763 | } else { |
| 1764 | writeU1(ci, new_ft); |
| 1765 | } |
| 1766 | } else if ( ft >= 64 && ft <= 127 ) { |
| 1767 | /* Frame Type: same_locals_1_stack_item_frame ([64,127]) */ |
| 1768 | unsigned new_ft; /* new frame_type */ |
| 1769 | |
| 1770 | delta = (delta_adj + ft - 64); |
| 1771 | new_pc = method_code_map(mi, last_pc + delta); |
| 1772 | new_delta = new_pc - last_new_pc; |
| 1773 | if ( (new_delta - delta_adj) > 63 ) { |
| 1774 | /* Change to same_locals_1_stack_item_frame_extended (247) */ |
| 1775 | new_ft = 247; |
| 1776 | writeU1(ci, new_ft); |
| 1777 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1778 | } else { |
| 1779 | new_ft = (new_delta - delta_adj) + 64; |
| 1780 | writeU1(ci, new_ft); |
| 1781 | } |
| 1782 | copy_verification_types(mi, 1); |
| 1783 | } else if ( ft >= 128 && ft <= 246 ) { |
| 1784 | /* Frame Type: reserved_for_future_use ([128,246]) */ |
| 1785 | CRW_FATAL(ci, "Unknown frame type in StackMapTable attribute"); |
| 1786 | } else if ( ft == 247 ) { |
| 1787 | /* Frame Type: same_locals_1_stack_item_frame_extended (247) */ |
| 1788 | delta = (delta_adj + readUoffset(mi)); |
| 1789 | new_pc = method_code_map(mi, last_pc + delta); |
| 1790 | new_delta = new_pc - last_new_pc; |
| 1791 | writeU1(ci, ft); |
| 1792 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1793 | copy_verification_types(mi, 1); |
| 1794 | } else if ( ft >= 248 && ft <= 250 ) { |
| 1795 | /* Frame Type: chop_frame ([248,250]) */ |
| 1796 | delta = (delta_adj + readUoffset(mi)); |
| 1797 | new_pc = method_code_map(mi, last_pc + delta); |
| 1798 | new_delta = new_pc - last_new_pc; |
| 1799 | writeU1(ci, ft); |
| 1800 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1801 | } else if ( ft == 251 ) { |
| 1802 | /* Frame Type: same_frame_extended (251) */ |
| 1803 | delta = (delta_adj + readUoffset(mi)); |
| 1804 | new_pc = method_code_map(mi, last_pc + delta); |
| 1805 | new_delta = new_pc - last_new_pc; |
| 1806 | writeU1(ci, ft); |
| 1807 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1808 | } else if ( ft >= 252 && ft <= 254 ) { |
| 1809 | /* Frame Type: append_frame ([252,254]) */ |
| 1810 | delta = (delta_adj + readUoffset(mi)); |
| 1811 | new_pc = method_code_map(mi, last_pc + delta); |
| 1812 | new_delta = new_pc - last_new_pc; |
| 1813 | writeU1(ci, ft); |
| 1814 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1815 | copy_verification_types(mi, (ft - 251)); |
| 1816 | } else if ( ft == 255 ) { |
| 1817 | unsigned ntypes; |
| 1818 | |
| 1819 | /* Frame Type: full_frame (255) */ |
| 1820 | delta = (delta_adj + readUoffset(mi)); |
| 1821 | new_pc = method_code_map(mi, last_pc + delta); |
| 1822 | new_delta = new_pc - last_new_pc; |
| 1823 | writeU1(ci, ft); |
| 1824 | writeUoffset(mi, (new_delta - delta_adj)); |
| 1825 | ntypes = copyU2(ci); /* ulocalvar */ |
| 1826 | copy_verification_types(mi, ntypes); |
| 1827 | ntypes = copyU2(ci); /* ustack */ |
| 1828 | copy_verification_types(mi, ntypes); |
| 1829 | } |
| 1830 | |
| 1831 | /* Update last_pc and last_new_pc (save on calls to method_code_map) */ |
| 1832 | CRW_ASSERT(ci, delta >= 0); |
| 1833 | CRW_ASSERT(ci, new_delta >= 0); |
| 1834 | last_pc += delta; |
| 1835 | last_new_pc = new_pc; |
| 1836 | CRW_ASSERT(ci, last_pc <= mi->code_len); |
| 1837 | CRW_ASSERT(ci, last_new_pc <= mi->new_code_len); |
| 1838 | |
| 1839 | /* Delta adjustment, all deltas are -1 now in attribute */ |
| 1840 | delta_adj = 1; |
| 1841 | } |
| 1842 | |
| 1843 | /* Update the attribute length */ |
| 1844 | new_attr_len = ci->output_position - (save_position + 4); |
| 1845 | CRW_ASSERT(ci, new_attr_len >= attr_len); |
| 1846 | random_writeU4(ci, save_position, new_attr_len); |
| 1847 | } |
| 1848 | |
| 1849 | /* Process the CLDC StackMap attribute. We didn't add any basic blocks |
| 1850 | * so the frame count remains the same but we may need to process the |
| 1851 | * frame types due to offset changes putting things out of range. |
| 1852 | */ |
| 1853 | static void |
| 1854 | write_cldc_stackmap_table(MethodImage *mi) |
| 1855 | { |
| 1856 | CrwClassImage *ci; |
| 1857 | CrwPosition save_position; |
| 1858 | unsigned i; |
| 1859 | unsigned attr_len; |
| 1860 | unsigned new_attr_len; |
| 1861 | unsigned count; |
| 1862 | |
| 1863 | CRW_ASSERT_MI(mi); |
| 1864 | ci = mi->ci; |
| 1865 | |
| 1866 | /* Save the position of the attribute length so we can fix it later */ |
| 1867 | save_position = ci->output_position; |
| 1868 | attr_len = copyU4(ci); |
| 1869 | count = copyUoffset(mi); /* uoffset: number_of_entries */ |
| 1870 | if ( count == 0 ) { |
| 1871 | CRW_ASSERT(ci, attr_len==2); |
| 1872 | return; |
| 1873 | } |
| 1874 | |
| 1875 | /* Process entire stackmap */ |
| 1876 | for ( i = 0 ; i < count ; i++ ) { |
| 1877 | unsigned ntypes; |
| 1878 | |
| 1879 | writeUoffset(mi, method_code_map(mi, readUoffset(mi))); |
| 1880 | ntypes = copyU2(ci); /* ulocalvar */ |
| 1881 | copy_verification_types(mi, ntypes); |
| 1882 | ntypes = copyU2(ci); /* ustack */ |
| 1883 | copy_verification_types(mi, ntypes); |
| 1884 | } |
| 1885 | |
| 1886 | /* Update the attribute length */ |
| 1887 | new_attr_len = ci->output_position - (save_position + 4); |
| 1888 | CRW_ASSERT(ci, new_attr_len >= attr_len); |
| 1889 | random_writeU4(ci, save_position, new_attr_len); |
| 1890 | } |
| 1891 | |
| 1892 | static void |
| 1893 | method_write_exception_table(MethodImage *mi) |
| 1894 | { |
| 1895 | unsigned i; |
| 1896 | unsigned count; |
| 1897 | CrwClassImage * ci; |
| 1898 | |
| 1899 | CRW_ASSERT_MI(mi); |
| 1900 | ci = mi->ci; |
| 1901 | count = copyU2(ci); |
| 1902 | for(i=0; i<count; i++) { |
| 1903 | ByteOffset start_pc; |
| 1904 | ByteOffset new_start_pc; |
| 1905 | ByteOffset end_pc; |
| 1906 | ByteOffset new_end_pc; |
| 1907 | ByteOffset handler_pc; |
| 1908 | ByteOffset new_handler_pc; |
| 1909 | |
| 1910 | start_pc = readU2(ci); |
| 1911 | end_pc = readU2(ci); |
| 1912 | handler_pc = readU2(ci); |
| 1913 | |
| 1914 | new_start_pc = method_code_map(mi, start_pc); |
| 1915 | new_end_pc = method_code_map(mi, end_pc); |
| 1916 | new_handler_pc = method_code_map(mi, handler_pc); |
| 1917 | |
| 1918 | writeU2(ci, new_start_pc); |
| 1919 | writeU2(ci, new_end_pc); |
| 1920 | writeU2(ci, new_handler_pc); |
| 1921 | (void)copyU2(ci); |
| 1922 | } |
| 1923 | } |
| 1924 | |
| 1925 | static int |
| 1926 | attribute_match(CrwClassImage *ci, CrwCpoolIndex name_index, const char *name) |
| 1927 | { |
| 1928 | CrwConstantPoolEntry cs; |
| 1929 | int len; |
| 1930 | |
| 1931 | CRW_ASSERT_CI(ci); |
| 1932 | CRW_ASSERT(ci, name!=NULL); |
| 1933 | len = (int)strlen(name); |
| 1934 | cs = cpool_entry(ci, name_index); |
| 1935 | if ( cs.len==len && strncmp(cs.ptr, name, len)==0) { |
| 1936 | return 1; |
| 1937 | } |
| 1938 | return 0; |
| 1939 | } |
| 1940 | |
| 1941 | static void |
| 1942 | method_write_code_attribute(MethodImage *mi) |
| 1943 | { |
| 1944 | CrwClassImage * ci; |
| 1945 | CrwCpoolIndex name_index; |
| 1946 | |
| 1947 | CRW_ASSERT_MI(mi); |
| 1948 | ci = mi->ci; |
| 1949 | name_index = copyU2(ci); |
| 1950 | if ( attribute_match(ci, name_index, "LineNumberTable") ) { |
| 1951 | write_line_table(mi); |
| 1952 | } else if ( attribute_match(ci, name_index, "LocalVariableTable") ) { |
| 1953 | write_var_table(mi); |
| 1954 | } else if ( attribute_match(ci, name_index, "LocalVariableTypeTable") ) { |
| 1955 | write_var_table(mi); /* Exact same format as the LocalVariableTable */ |
| 1956 | } else if ( attribute_match(ci, name_index, "StackMapTable") ) { |
| 1957 | write_stackmap_table(mi); |
| 1958 | } else if ( attribute_match(ci, name_index, "StackMap") ) { |
| 1959 | write_cldc_stackmap_table(mi); |
| 1960 | } else { |
| 1961 | unsigned len; |
| 1962 | len = copyU4(ci); |
| 1963 | copy(ci, len); |
| 1964 | } |
| 1965 | } |
| 1966 | |
| 1967 | static int |
| 1968 | is_init_method(const char *name) |
| 1969 | { |
| 1970 | if ( name!=NULL && strcmp(name,"<init>")==0 ) { |
| 1971 | return JNI_TRUE; |
| 1972 | } |
| 1973 | return JNI_FALSE; |
| 1974 | } |
| 1975 | |
| 1976 | static int |
| 1977 | is_clinit_method(const char *name) |
| 1978 | { |
| 1979 | if ( name!=NULL && strcmp(name,"<clinit>")==0 ) { |
| 1980 | return JNI_TRUE; |
| 1981 | } |
| 1982 | return JNI_FALSE; |
| 1983 | } |
| 1984 | |
| 1985 | static int |
| 1986 | is_finalize_method(const char *name) |
| 1987 | { |
| 1988 | if ( name!=NULL && strcmp(name,"finalize")==0 ) { |
| 1989 | return JNI_TRUE; |
| 1990 | } |
| 1991 | return JNI_FALSE; |
| 1992 | } |
| 1993 | |
| 1994 | static int |
| 1995 | skip_method(CrwClassImage *ci, const char *name, |
| 1996 | unsigned access_flags, ByteOffset code_len, |
| 1997 | int system_class, jboolean *pskip_call_return_sites) |
| 1998 | { |
| 1999 | *pskip_call_return_sites = JNI_FALSE; |
| 2000 | if ( system_class ) { |
| 2001 | if ( code_len == 1 && is_init_method(name) ) { |
| 2002 | return JNI_TRUE; |
| 2003 | } else if ( code_len == 1 && is_finalize_method(name) ) { |
| 2004 | return JNI_TRUE; |
| 2005 | } else if ( is_clinit_method(name) ) { |
| 2006 | return JNI_TRUE; |
| 2007 | } else if ( ci->is_thread_class && strcmp(name,"currentThread")==0 ) { |
| 2008 | return JNI_TRUE; |
| 2009 | } |
| 2010 | /* |
| 2011 | if ( access_flags & JVM_ACC_PRIVATE ) { |
| 2012 | *pskip_call_return_sites = JNI_TRUE; |
| 2013 | } |
| 2014 | */ |
| 2015 | } |
| 2016 | return JNI_FALSE; |
| 2017 | } |
| 2018 | |
| 2019 | /* Process all code attributes */ |
| 2020 | static void |
| 2021 | method_write_bytecodes(CrwClassImage *ci, unsigned mnum, unsigned access_flags) |
| 2022 | { |
| 2023 | CrwPosition output_attr_len_position; |
| 2024 | CrwPosition output_max_stack_position; |
| 2025 | CrwPosition output_code_len_position; |
| 2026 | CrwPosition start_of_output_bytecodes; |
| 2027 | unsigned i; |
| 2028 | unsigned attr_len; |
| 2029 | unsigned max_stack; |
| 2030 | ByteOffset code_len; |
| 2031 | unsigned attr_count; |
| 2032 | unsigned new_attr_len; |
| 2033 | MethodImage * mi; |
| 2034 | jboolean object_init_method; |
| 2035 | jboolean skip_call_return_sites; |
| 2036 | |
| 2037 | CRW_ASSERT_CI(ci); |
| 2038 | |
| 2039 | /* Attribute Length */ |
| 2040 | output_attr_len_position = ci->output_position; |
| 2041 | attr_len = copyU4(ci); |
| 2042 | |
| 2043 | /* Max Stack */ |
| 2044 | output_max_stack_position = ci->output_position; |
| 2045 | max_stack = copyU2(ci); |
| 2046 | |
| 2047 | /* Max Locals */ |
| 2048 | (void)copyU2(ci); |
| 2049 | |
| 2050 | /* Code Length */ |
| 2051 | output_code_len_position = ci->output_position; |
| 2052 | code_len = copyU4(ci); |
| 2053 | start_of_output_bytecodes = ci->output_position; |
| 2054 | |
| 2055 | /* Some methods should not be instrumented */ |
| 2056 | object_init_method = JNI_FALSE; |
| 2057 | skip_call_return_sites = JNI_FALSE; |
| 2058 | if ( ci->is_object_class && |
| 2059 | is_init_method(ci->method_name[mnum]) && |
| 2060 | strcmp(ci->method_descr[mnum],"()V")==0 ) { |
| 2061 | object_init_method = JNI_TRUE; |
| 2062 | skip_call_return_sites = JNI_TRUE; |
| 2063 | } else if ( skip_method(ci, ci->method_name[mnum], access_flags, |
| 2064 | code_len, ci->system_class, &skip_call_return_sites) ) { |
| 2065 | /* Copy remainder minus already copied, the U2 max_stack, |
| 2066 | * U2 max_locals, and U4 code_length fields have already |
| 2067 | * been processed. |
| 2068 | */ |
| 2069 | copy(ci, attr_len - (2+2+4)); |
| 2070 | return; |
| 2071 | } |
| 2072 | |
| 2073 | /* Start Injection */ |
| 2074 | mi = method_init(ci, mnum, code_len); |
| 2075 | mi->object_init_method = object_init_method; |
| 2076 | mi->access_flags = access_flags; |
| 2077 | mi->skip_call_return_sites = skip_call_return_sites; |
| 2078 | |
| 2079 | /* Save the current position as the start of the input bytecodes */ |
| 2080 | mi->start_of_input_bytecodes = ci->input_position; |
| 2081 | |
| 2082 | /* The max stack may increase */ |
| 2083 | mi->max_stack = max_stack; |
| 2084 | mi->new_max_stack = max_stack; |
| 2085 | |
| 2086 | /* Adjust all code offsets */ |
| 2087 | method_inject_and_write_code(mi); |
| 2088 | |
| 2089 | /* Fix up code length (save new_code_len for later attribute processing) */ |
| 2090 | mi->new_code_len = (int)(ci->output_position - start_of_output_bytecodes); |
| 2091 | random_writeU4(ci, output_code_len_position, mi->new_code_len); |
| 2092 | |
| 2093 | /* Fixup max stack */ |
| 2094 | CRW_ASSERT(ci, mi->new_max_stack <= 0xFFFF); |
| 2095 | random_writeU2(ci, output_max_stack_position, mi->new_max_stack); |
| 2096 | |
| 2097 | /* Copy exception table */ |
| 2098 | method_write_exception_table(mi); |
| 2099 | |
| 2100 | /* Copy code attributes (needs mi->new_code_len) */ |
| 2101 | attr_count = copyU2(ci); |
| 2102 | for (i = 0; i < attr_count; ++i) { |
| 2103 | method_write_code_attribute(mi); |
| 2104 | } |
| 2105 | |
| 2106 | /* Fix up attribute length */ |
| 2107 | new_attr_len = (int)(ci->output_position - (output_attr_len_position + 4)); |
| 2108 | random_writeU4(ci, output_attr_len_position, new_attr_len); |
| 2109 | |
| 2110 | /* Free method data */ |
| 2111 | method_term(mi); |
| 2112 | mi = NULL; |
| 2113 | |
| 2114 | } |
| 2115 | |
| 2116 | static void |
| 2117 | method_write(CrwClassImage *ci, unsigned mnum) |
| 2118 | { |
| 2119 | unsigned i; |
| 2120 | unsigned access_flags; |
| 2121 | CrwCpoolIndex name_index; |
| 2122 | CrwCpoolIndex descr_index; |
| 2123 | unsigned attr_count; |
| 2124 | |
| 2125 | access_flags = copyU2(ci); |
| 2126 | name_index = copyU2(ci); |
| 2127 | ci->method_name[mnum] = cpool_entry(ci, name_index).ptr; |
| 2128 | descr_index = copyU2(ci); |
| 2129 | ci->method_descr[mnum] = cpool_entry(ci, descr_index).ptr; |
| 2130 | attr_count = copyU2(ci); |
| 2131 | |
| 2132 | for (i = 0; i < attr_count; ++i) { |
| 2133 | CrwCpoolIndex name_index; |
| 2134 | |
| 2135 | name_index = copyU2(ci); |
| 2136 | if ( attribute_match(ci, name_index, "Code") ) { |
| 2137 | method_write_bytecodes(ci, mnum, access_flags); |
| 2138 | } else { |
| 2139 | unsigned len; |
| 2140 | len = copyU4(ci); |
| 2141 | copy(ci, len); |
| 2142 | } |
| 2143 | } |
| 2144 | } |
| 2145 | |
| 2146 | static void |
| 2147 | method_write_all(CrwClassImage *ci) |
| 2148 | { |
| 2149 | unsigned i; |
| 2150 | unsigned count; |
| 2151 | |
| 2152 | count = copyU2(ci); |
| 2153 | ci->method_count = count; |
| 2154 | if ( count > 0 ) { |
| 2155 | ci->method_name = (const char **)allocate_clean(ci, count*(int)sizeof(const char*)); |
| 2156 | ci->method_descr = (const char **)allocate_clean(ci, count*(int)sizeof(const char*)); |
| 2157 | } |
| 2158 | |
| 2159 | for (i = 0; i < count; ++i) { |
| 2160 | method_write(ci, i); |
| 2161 | } |
| 2162 | |
| 2163 | if ( ci->mnum_callback != NULL ) { |
| 2164 | (*(ci->mnum_callback))(ci->number, ci->method_name, ci->method_descr, |
| 2165 | count); |
| 2166 | } |
| 2167 | } |
| 2168 | |
| 2169 | /* ------------------------------------------------------------------- */ |
| 2170 | /* Cleanup function. */ |
| 2171 | |
| 2172 | static void |
| 2173 | cleanup(CrwClassImage *ci) |
| 2174 | { |
| 2175 | CRW_ASSERT_CI(ci); |
| 2176 | if ( ci->name != NULL ) { |
| 2177 | deallocate(ci, (void*)ci->name); |
| 2178 | ci->name = NULL; |
| 2179 | } |
| 2180 | if ( ci->method_name != NULL ) { |
| 2181 | deallocate(ci, (void*)ci->method_name); |
| 2182 | ci->method_name = NULL; |
| 2183 | } |
| 2184 | if ( ci->method_descr != NULL ) { |
| 2185 | deallocate(ci, (void*)ci->method_descr); |
| 2186 | ci->method_descr = NULL; |
| 2187 | } |
| 2188 | if ( ci->cpool != NULL ) { |
| 2189 | CrwCpoolIndex i; |
| 2190 | for(i=0; i<ci->cpool_count_plus_one; i++) { |
| 2191 | if ( ci->cpool[i].ptr != NULL ) { |
| 2192 | deallocate(ci, (void*)(ci->cpool[i].ptr)); |
| 2193 | ci->cpool[i].ptr = NULL; |
| 2194 | } |
| 2195 | } |
| 2196 | deallocate(ci, (void*)ci->cpool); |
| 2197 | ci->cpool = NULL; |
| 2198 | } |
| 2199 | } |
| 2200 | |
| 2201 | static jboolean |
| 2202 | skip_class(unsigned access_flags) |
| 2203 | { |
| 2204 | if ( access_flags & JVM_ACC_INTERFACE ) { |
| 2205 | return JNI_TRUE; |
| 2206 | } |
| 2207 | return JNI_FALSE; |
| 2208 | } |
| 2209 | |
| 2210 | static long |
| 2211 | inject_class(struct CrwClassImage *ci, |
| 2212 | int system_class, |
| 2213 | char* tclass_name, |
| 2214 | char* tclass_sig, |
| 2215 | char* call_name, |
| 2216 | char* call_sig, |
| 2217 | char* return_name, |
| 2218 | char* return_sig, |
| 2219 | char* obj_init_name, |
| 2220 | char* obj_init_sig, |
| 2221 | char* newarray_name, |
| 2222 | char* newarray_sig, |
| 2223 | unsigned char *buf, |
| 2224 | long buf_len) |
| 2225 | { |
| 2226 | CrwConstantPoolEntry cs; |
| 2227 | CrwCpoolIndex this_class; |
| 2228 | CrwCpoolIndex super_class; |
| 2229 | unsigned magic; |
| 2230 | unsigned classfileVersion; |
| 2231 | unsigned interface_count; |
| 2232 | |
| 2233 | CRW_ASSERT_CI(ci); |
| 2234 | CRW_ASSERT(ci, buf!=NULL); |
| 2235 | CRW_ASSERT(ci, buf_len!=0); |
| 2236 | |
| 2237 | CRW_ASSERT(ci, strchr(tclass_name,'.')==NULL); /* internal qualified name */ |
| 2238 | |
| 2239 | ci->injection_count = 0; |
| 2240 | ci->system_class = system_class; |
| 2241 | ci->tclass_name = tclass_name; |
| 2242 | ci->tclass_sig = tclass_sig; |
| 2243 | ci->call_name = call_name; |
| 2244 | ci->call_sig = call_sig; |
| 2245 | ci->return_name = return_name; |
| 2246 | ci->return_sig = return_sig; |
| 2247 | ci->obj_init_name = obj_init_name; |
| 2248 | ci->obj_init_sig = obj_init_sig; |
| 2249 | ci->newarray_name = newarray_name; |
| 2250 | ci->newarray_sig = newarray_sig; |
| 2251 | ci->output = buf; |
| 2252 | ci->output_len = buf_len; |
| 2253 | |
| 2254 | magic = copyU4(ci); |
| 2255 | CRW_ASSERT(ci, magic==0xCAFEBABE); |
| 2256 | if ( magic != 0xCAFEBABE ) { |
| 2257 | return (long)0; |
| 2258 | } |
| 2259 | |
| 2260 | /* minor version number not used */ |
| 2261 | (void)copyU2(ci); |
| 2262 | /* major version number not used */ |
| 2263 | classfileVersion = copyU2(ci); |
| 2264 | CRW_ASSERT(ci, classfileVersion <= 50); /* Mustang class files or less */ |
| 2265 | |
| 2266 | cpool_setup(ci); |
| 2267 | |
| 2268 | ci->access_flags = copyU2(ci); |
| 2269 | if ( skip_class(ci->access_flags) ) { |
| 2270 | return (long)0; |
| 2271 | } |
| 2272 | |
| 2273 | this_class = copyU2(ci); |
| 2274 | |
| 2275 | cs = cpool_entry(ci, (CrwCpoolIndex)(cpool_entry(ci, this_class).index1)); |
| 2276 | if ( ci->name == NULL ) { |
| 2277 | ci->name = duplicate(ci, cs.ptr, cs.len); |
| 2278 | CRW_ASSERT(ci, strchr(ci->name,'.')==NULL); /* internal qualified name */ |
| 2279 | } |
| 2280 | CRW_ASSERT(ci, (int)strlen(ci->name)==cs.len && strncmp(ci->name, cs.ptr, cs.len)==0); |
| 2281 | |
| 2282 | super_class = copyU2(ci); |
| 2283 | if ( super_class == 0 ) { |
| 2284 | ci->is_object_class = JNI_TRUE; |
| 2285 | CRW_ASSERT(ci, strcmp(ci->name,"java/lang/Object")==0); |
| 2286 | } |
| 2287 | |
| 2288 | interface_count = copyU2(ci); |
| 2289 | copy(ci, interface_count * 2); |
| 2290 | |
| 2291 | copy_all_fields(ci); |
| 2292 | |
| 2293 | method_write_all(ci); |
| 2294 | |
| 2295 | if ( ci->injection_count == 0 ) { |
| 2296 | return (long)0; |
| 2297 | } |
| 2298 | |
| 2299 | copy_attributes(ci); |
| 2300 | |
| 2301 | return (long)ci->output_position; |
| 2302 | } |
| 2303 | |
| 2304 | /* ------------------------------------------------------------------- */ |
| 2305 | /* Exported interfaces */ |
| 2306 | |
| 2307 | JNIEXPORT void JNICALL |
| 2308 | java_crw_demo(unsigned class_number, |
| 2309 | const char *name, |
| 2310 | const unsigned char *file_image, |
| 2311 | long file_len, |
| 2312 | int system_class, |
| 2313 | char* tclass_name, /* Name of class that has tracker methods. */ |
| 2314 | char* tclass_sig, /* Signature of tclass */ |
| 2315 | char* call_name, /* Method name to call at offset 0 */ |
| 2316 | char* call_sig, /* Signature of this method */ |
| 2317 | char* return_name, /* Method name to call before any return */ |
| 2318 | char* return_sig, /* Signature of this method */ |
| 2319 | char* obj_init_name, /* Method name to call in Object <init> */ |
| 2320 | char* obj_init_sig, /* Signature of this method */ |
| 2321 | char* newarray_name, /* Method name to call after newarray opcodes */ |
| 2322 | char* newarray_sig, /* Signature of this method */ |
| 2323 | unsigned char **pnew_file_image, |
| 2324 | long *pnew_file_len, |
| 2325 | FatalErrorHandler fatal_error_handler, |
| 2326 | MethodNumberRegister mnum_callback) |
| 2327 | { |
| 2328 | CrwClassImage ci; |
| 2329 | long max_length; |
| 2330 | long new_length; |
| 2331 | void *new_image; |
| 2332 | int len; |
| 2333 | |
| 2334 | /* Initial setup of the CrwClassImage structure */ |
| 2335 | (void)memset(&ci, 0, (int)sizeof(CrwClassImage)); |
| 2336 | ci.fatal_error_handler = fatal_error_handler; |
| 2337 | ci.mnum_callback = mnum_callback; |
| 2338 | |
| 2339 | /* Do some interface error checks */ |
| 2340 | if ( pnew_file_image==NULL ) { |
| 2341 | CRW_FATAL(&ci, "pnew_file_image==NULL"); |
| 2342 | } |
| 2343 | if ( pnew_file_len==NULL ) { |
| 2344 | CRW_FATAL(&ci, "pnew_file_len==NULL"); |
| 2345 | } |
| 2346 | |
| 2347 | /* No file length means do nothing */ |
| 2348 | *pnew_file_image = NULL; |
| 2349 | *pnew_file_len = 0; |
| 2350 | if ( file_len==0 ) { |
| 2351 | return; |
| 2352 | } |
| 2353 | |
| 2354 | /* Do some more interface error checks */ |
| 2355 | if ( file_image == NULL ) { |
| 2356 | CRW_FATAL(&ci, "file_image == NULL"); |
| 2357 | } |
| 2358 | if ( file_len < 0 ) { |
| 2359 | CRW_FATAL(&ci, "file_len < 0"); |
| 2360 | } |
| 2361 | if ( system_class != 0 && system_class != 1 ) { |
| 2362 | CRW_FATAL(&ci, "system_class is not 0 or 1"); |
| 2363 | } |
| 2364 | if ( tclass_name == NULL ) { |
| 2365 | CRW_FATAL(&ci, "tclass_name == NULL"); |
| 2366 | } |
| 2367 | if ( tclass_sig == NULL || tclass_sig[0]!='L' ) { |
| 2368 | CRW_FATAL(&ci, "tclass_sig is not a valid class signature"); |
| 2369 | } |
| 2370 | len = (int)strlen(tclass_sig); |
| 2371 | if ( tclass_sig[len-1]!=';' ) { |
| 2372 | CRW_FATAL(&ci, "tclass_sig is not a valid class signature"); |
| 2373 | } |
| 2374 | if ( call_name != NULL ) { |
| 2375 | if ( call_sig == NULL || strcmp(call_sig, "(II)V") != 0 ) { |
| 2376 | CRW_FATAL(&ci, "call_sig is not (II)V"); |
| 2377 | } |
| 2378 | } |
| 2379 | if ( return_name != NULL ) { |
| 2380 | if ( return_sig == NULL || strcmp(return_sig, "(II)V") != 0 ) { |
| 2381 | CRW_FATAL(&ci, "return_sig is not (II)V"); |
| 2382 | } |
| 2383 | } |
| 2384 | if ( obj_init_name != NULL ) { |
| 2385 | if ( obj_init_sig == NULL || strcmp(obj_init_sig, "(Ljava/lang/Object;)V") != 0 ) { |
| 2386 | CRW_FATAL(&ci, "obj_init_sig is not (Ljava/lang/Object;)V"); |
| 2387 | } |
| 2388 | } |
| 2389 | if ( newarray_name != NULL ) { |
| 2390 | if ( newarray_sig == NULL || strcmp(newarray_sig, "(Ljava/lang/Object;)V") != 0 ) { |
| 2391 | CRW_FATAL(&ci, "newarray_sig is not (Ljava/lang/Object;)V"); |
| 2392 | } |
| 2393 | } |
| 2394 | |
| 2395 | /* Finish setup the CrwClassImage structure */ |
| 2396 | ci.is_thread_class = JNI_FALSE; |
| 2397 | if ( name != NULL ) { |
| 2398 | CRW_ASSERT(&ci, strchr(name,'.')==NULL); /* internal qualified name */ |
| 2399 | |
| 2400 | ci.name = duplicate(&ci, name, (int)strlen(name)); |
| 2401 | if ( strcmp(name, "java/lang/Thread")==0 ) { |
| 2402 | ci.is_thread_class = JNI_TRUE; |
| 2403 | } |
| 2404 | } |
| 2405 | ci.number = class_number; |
| 2406 | ci.input = file_image; |
| 2407 | ci.input_len = file_len; |
| 2408 | |
| 2409 | /* Do the injection */ |
| 2410 | max_length = file_len*2 + 512; /* Twice as big + 512 */ |
| 2411 | new_image = allocate(&ci, (int)max_length); |
| 2412 | new_length = inject_class(&ci, |
| 2413 | system_class, |
| 2414 | tclass_name, |
| 2415 | tclass_sig, |
| 2416 | call_name, |
| 2417 | call_sig, |
| 2418 | return_name, |
| 2419 | return_sig, |
| 2420 | obj_init_name, |
| 2421 | obj_init_sig, |
| 2422 | newarray_name, |
| 2423 | newarray_sig, |
| 2424 | new_image, |
| 2425 | max_length); |
| 2426 | |
| 2427 | /* Dispose or shrink the space to be returned. */ |
| 2428 | if ( new_length == 0 ) { |
| 2429 | deallocate(&ci, (void*)new_image); |
| 2430 | new_image = NULL; |
| 2431 | } else { |
| 2432 | new_image = (void*)reallocate(&ci, (void*)new_image, (int)new_length); |
| 2433 | } |
| 2434 | |
| 2435 | /* Return the new class image */ |
| 2436 | *pnew_file_image = (unsigned char *)new_image; |
| 2437 | *pnew_file_len = (long)new_length; |
| 2438 | |
| 2439 | /* Cleanup before we leave. */ |
| 2440 | cleanup(&ci); |
| 2441 | } |
| 2442 | |
| 2443 | /* Return the classname for this class which is inside the classfile image. */ |
| 2444 | JNIEXPORT char * JNICALL |
| 2445 | java_crw_demo_classname(const unsigned char *file_image, long file_len, |
| 2446 | FatalErrorHandler fatal_error_handler) |
| 2447 | { |
| 2448 | CrwClassImage ci; |
| 2449 | CrwConstantPoolEntry cs; |
| 2450 | CrwCpoolIndex this_class; |
| 2451 | unsigned magic; |
| 2452 | char * name; |
| 2453 | |
| 2454 | name = NULL; |
| 2455 | |
| 2456 | if ( file_len==0 || file_image==NULL ) { |
| 2457 | return name; |
| 2458 | } |
| 2459 | |
| 2460 | /* The only fields we need filled in are the image pointer and the error |
| 2461 | * handler. |
| 2462 | * By not adding an output buffer pointer, no output is created. |
| 2463 | */ |
| 2464 | (void)memset(&ci, 0, (int)sizeof(CrwClassImage)); |
| 2465 | ci.input = file_image; |
| 2466 | ci.input_len = file_len; |
| 2467 | ci.fatal_error_handler = fatal_error_handler; |
| 2468 | |
| 2469 | /* Read out the bytes from the classfile image */ |
| 2470 | |
| 2471 | magic = readU4(&ci); /* magic number */ |
| 2472 | CRW_ASSERT(&ci, magic==0xCAFEBABE); |
| 2473 | if ( magic != 0xCAFEBABE ) { |
| 2474 | return name; |
| 2475 | } |
| 2476 | (void)readU2(&ci); /* minor version number */ |
| 2477 | (void)readU2(&ci); /* major version number */ |
| 2478 | |
| 2479 | /* Read in constant pool. Since no output setup, writes are NOP's */ |
| 2480 | cpool_setup(&ci); |
| 2481 | |
| 2482 | (void)readU2(&ci); /* access flags */ |
| 2483 | this_class = readU2(&ci); /* 'this' class */ |
| 2484 | |
| 2485 | /* Get 'this' constant pool entry */ |
| 2486 | cs = cpool_entry(&ci, (CrwCpoolIndex)(cpool_entry(&ci, this_class).index1)); |
| 2487 | |
| 2488 | /* Duplicate the name */ |
| 2489 | name = (char *)duplicate(&ci, cs.ptr, cs.len); |
| 2490 | |
| 2491 | /* Cleanup before we leave. */ |
| 2492 | cleanup(&ci); |
| 2493 | |
| 2494 | /* Return malloc space */ |
| 2495 | return name; |
| 2496 | } |