J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004-2006 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 | #include "stdlib.h" |
| 33 | |
| 34 | #include "heapTracker.h" |
| 35 | #include "java_crw_demo.h" |
| 36 | |
| 37 | #include "jni.h" |
| 38 | #include "jvmti.h" |
| 39 | |
| 40 | #include "agent_util.h" |
| 41 | |
| 42 | /* ------------------------------------------------------------------- |
| 43 | * Some constant names that tie to Java class/method names. |
| 44 | * We assume the Java class whose static methods we will be calling |
| 45 | * looks like: |
| 46 | * |
| 47 | * public class HeapTracker { |
| 48 | * private static int engaged; |
| 49 | * private static native void _newobj(Object thr, Object o); |
| 50 | * public static void newobj(Object o) |
| 51 | * { |
| 52 | * if ( engaged != 0 ) { |
| 53 | * _newobj(Thread.currentThread(), o); |
| 54 | * } |
| 55 | * } |
| 56 | * private static native void _newarr(Object thr, Object a); |
| 57 | * public static void newarr(Object a) |
| 58 | * { |
| 59 | * if ( engaged != 0 ) { |
| 60 | * _newarr(Thread.currentThread(), a); |
| 61 | * } |
| 62 | * } |
| 63 | * } |
| 64 | * |
| 65 | * The engaged field allows us to inject all classes (even system classes) |
| 66 | * and delay the actual calls to the native code until the VM has reached |
| 67 | * a safe time to call native methods (Past the JVMTI VM_START event). |
| 68 | * |
| 69 | */ |
| 70 | |
| 71 | #define HEAP_TRACKER_class HeapTracker /* Name of class we are using */ |
| 72 | #define HEAP_TRACKER_newobj newobj /* Name of java init method */ |
| 73 | #define HEAP_TRACKER_newarr newarr /* Name of java newarray method */ |
| 74 | #define HEAP_TRACKER_native_newobj _newobj /* Name of java newobj native */ |
| 75 | #define HEAP_TRACKER_native_newarr _newarr /* Name of java newarray native */ |
| 76 | #define HEAP_TRACKER_engaged engaged /* Name of static field switch */ |
| 77 | |
| 78 | /* C macros to create strings from tokens */ |
| 79 | #define _STRING(s) #s |
| 80 | #define STRING(s) _STRING(s) |
| 81 | |
| 82 | /* ------------------------------------------------------------------- */ |
| 83 | |
| 84 | /* Flavors of traces (to separate out stack traces) */ |
| 85 | |
| 86 | typedef enum { |
| 87 | TRACE_FIRST = 0, |
| 88 | TRACE_USER = 0, |
| 89 | TRACE_BEFORE_VM_START = 1, |
| 90 | TRACE_BEFORE_VM_INIT = 2, |
| 91 | TRACE_VM_OBJECT = 3, |
| 92 | TRACE_MYSTERY = 4, |
| 93 | TRACE_LAST = 4 |
| 94 | } TraceFlavor; |
| 95 | |
| 96 | static char * flavorDesc[] = { |
| 97 | "", |
| 98 | "before VM_START", |
| 99 | "before VM_INIT", |
| 100 | "VM_OBJECT", |
| 101 | "unknown" |
| 102 | }; |
| 103 | |
| 104 | /* Trace (Stack Trace) */ |
| 105 | |
| 106 | #define MAX_FRAMES 6 |
| 107 | typedef struct Trace { |
| 108 | /* Number of frames (includes HEAP_TRACKER methods) */ |
| 109 | jint nframes; |
| 110 | /* Frames from GetStackTrace() (2 extra for HEAP_TRACKER methods) */ |
| 111 | jvmtiFrameInfo frames[MAX_FRAMES+2]; |
| 112 | /* Used to make some traces unique */ |
| 113 | TraceFlavor flavor; |
| 114 | } Trace; |
| 115 | |
| 116 | /* Trace information (more than one object will have this as a tag) */ |
| 117 | |
| 118 | typedef struct TraceInfo { |
| 119 | /* Trace where this object was allocated from */ |
| 120 | Trace trace; |
| 121 | /* 64 bit hash code that attempts to identify this specific trace */ |
| 122 | jlong hashCode; |
| 123 | /* Total space taken up by objects allocated from this trace */ |
| 124 | jlong totalSpace; |
| 125 | /* Total count of objects ever allocated from this trace */ |
| 126 | int totalCount; |
| 127 | /* Total live objects that were allocated from this trace */ |
| 128 | int useCount; |
| 129 | /* The next TraceInfo in the hash bucket chain */ |
| 130 | struct TraceInfo *next; |
| 131 | } TraceInfo; |
| 132 | |
| 133 | /* Global agent data structure */ |
| 134 | |
| 135 | typedef struct { |
| 136 | /* JVMTI Environment */ |
| 137 | jvmtiEnv *jvmti; |
| 138 | /* State of the VM flags */ |
| 139 | jboolean vmStarted; |
| 140 | jboolean vmInitialized; |
| 141 | jboolean vmDead; |
| 142 | /* Options */ |
| 143 | int maxDump; |
| 144 | /* Data access Lock */ |
| 145 | jrawMonitorID lock; |
| 146 | /* Counter on classes where BCI has been applied */ |
| 147 | jint ccount; |
| 148 | /* Hash table to lookup TraceInfo's via Trace's */ |
| 149 | #define HASH_INDEX_BIT_WIDTH 12 /* 4096 */ |
| 150 | #define HASH_BUCKET_COUNT (1<<HASH_INDEX_BIT_WIDTH) |
| 151 | #define HASH_INDEX_MASK (HASH_BUCKET_COUNT-1) |
| 152 | TraceInfo *hashBuckets[HASH_BUCKET_COUNT]; |
| 153 | /* Count of TraceInfo's allocated */ |
| 154 | int traceInfoCount; |
| 155 | /* Pre-defined traces for the system and mystery situations */ |
| 156 | TraceInfo *emptyTrace[TRACE_LAST+1]; |
| 157 | } GlobalAgentData; |
| 158 | |
| 159 | static GlobalAgentData *gdata; |
| 160 | |
| 161 | /* Enter a critical section by doing a JVMTI Raw Monitor Enter */ |
| 162 | static void |
| 163 | enterCriticalSection(jvmtiEnv *jvmti) |
| 164 | { |
| 165 | jvmtiError error; |
| 166 | |
| 167 | error = (*jvmti)->RawMonitorEnter(jvmti, gdata->lock); |
| 168 | check_jvmti_error(jvmti, error, "Cannot enter with raw monitor"); |
| 169 | } |
| 170 | |
| 171 | /* Exit a critical section by doing a JVMTI Raw Monitor Exit */ |
| 172 | static void |
| 173 | exitCriticalSection(jvmtiEnv *jvmti) |
| 174 | { |
| 175 | jvmtiError error; |
| 176 | |
| 177 | error = (*jvmti)->RawMonitorExit(jvmti, gdata->lock); |
| 178 | check_jvmti_error(jvmti, error, "Cannot exit with raw monitor"); |
| 179 | } |
| 180 | |
| 181 | /* Update stats on a TraceInfo */ |
| 182 | static TraceInfo * |
| 183 | updateStats(TraceInfo *tinfo) |
| 184 | { |
| 185 | tinfo->totalCount++; |
| 186 | tinfo->useCount++; |
| 187 | return tinfo; |
| 188 | } |
| 189 | |
| 190 | /* Get TraceInfo for empty stack */ |
| 191 | static TraceInfo * |
| 192 | emptyTrace(TraceFlavor flavor) |
| 193 | { |
| 194 | return updateStats(gdata->emptyTrace[flavor]); |
| 195 | } |
| 196 | |
| 197 | /* Allocate new TraceInfo */ |
| 198 | static TraceInfo * |
| 199 | newTraceInfo(Trace *trace, jlong hashCode, TraceFlavor flavor) |
| 200 | { |
| 201 | TraceInfo *tinfo; |
| 202 | |
| 203 | tinfo = (TraceInfo*)calloc(1, sizeof(TraceInfo)); |
| 204 | if ( tinfo == NULL ) { |
| 205 | fatal_error("ERROR: Ran out of malloc() space\n"); |
| 206 | } else { |
| 207 | int hashIndex; |
| 208 | |
| 209 | tinfo->trace = *trace; |
| 210 | tinfo->trace.flavor = flavor; |
| 211 | tinfo->hashCode = hashCode; |
| 212 | gdata->traceInfoCount++; |
| 213 | hashIndex = (int)(hashCode & HASH_INDEX_MASK); |
| 214 | tinfo->next = gdata->hashBuckets[hashIndex]; |
| 215 | gdata->hashBuckets[hashIndex] = tinfo; |
| 216 | } |
| 217 | return tinfo; |
| 218 | } |
| 219 | |
| 220 | /* Create hash code for a Trace */ |
| 221 | static jlong |
| 222 | hashTrace(Trace *trace) |
| 223 | { |
| 224 | jlong hashCode; |
| 225 | int i; |
| 226 | |
| 227 | hashCode = 0; |
| 228 | for ( i = 0 ; i < trace->nframes ; i++ ) { |
| 229 | hashCode = (hashCode << 3) + |
| 230 | (jlong)(ptrdiff_t)(void*)(trace->frames[i].method); |
| 231 | hashCode = (hashCode << 2) + |
| 232 | (jlong)(trace->frames[i].location); |
| 233 | } |
| 234 | hashCode = (hashCode << 3) + trace->nframes; |
| 235 | hashCode += trace->flavor; |
| 236 | return hashCode; |
| 237 | } |
| 238 | |
| 239 | /* Lookup or create a new TraceInfo */ |
| 240 | static TraceInfo * |
| 241 | lookupOrEnter(jvmtiEnv *jvmti, Trace *trace, TraceFlavor flavor) |
| 242 | { |
| 243 | TraceInfo *tinfo; |
| 244 | jlong hashCode; |
| 245 | |
| 246 | /* Calculate hash code (outside critical section to lessen contention) */ |
| 247 | hashCode = hashTrace(trace); |
| 248 | |
| 249 | /* Do a lookup in the hash table */ |
| 250 | enterCriticalSection(jvmti); { |
| 251 | TraceInfo *prev; |
| 252 | int hashIndex; |
| 253 | |
| 254 | /* Start with first item in hash buck chain */ |
| 255 | prev = NULL; |
| 256 | hashIndex = (int)(hashCode & HASH_INDEX_MASK); |
| 257 | tinfo = gdata->hashBuckets[hashIndex]; |
| 258 | while ( tinfo != NULL ) { |
| 259 | if ( tinfo->hashCode == hashCode && |
| 260 | memcmp(trace, &(tinfo->trace), sizeof(Trace))==0 ) { |
| 261 | /* We found one that matches, move to head of bucket chain */ |
| 262 | if ( prev != NULL ) { |
| 263 | /* Remove from list and add to head of list */ |
| 264 | prev->next = tinfo->next; |
| 265 | tinfo->next = gdata->hashBuckets[hashIndex]; |
| 266 | gdata->hashBuckets[hashIndex] = tinfo; |
| 267 | } |
| 268 | /* Break out */ |
| 269 | break; |
| 270 | } |
| 271 | prev = tinfo; |
| 272 | tinfo = tinfo->next; |
| 273 | } |
| 274 | |
| 275 | /* If we didn't find anything we need to enter a new entry */ |
| 276 | if ( tinfo == NULL ) { |
| 277 | /* Create new hash table element */ |
| 278 | tinfo = newTraceInfo(trace, hashCode, flavor); |
| 279 | } |
| 280 | |
| 281 | /* Update stats */ |
| 282 | (void)updateStats(tinfo); |
| 283 | |
| 284 | } exitCriticalSection(jvmti); |
| 285 | |
| 286 | return tinfo; |
| 287 | } |
| 288 | |
| 289 | /* Get TraceInfo for this allocation */ |
| 290 | static TraceInfo * |
| 291 | findTraceInfo(jvmtiEnv *jvmti, jthread thread, TraceFlavor flavor) |
| 292 | { |
| 293 | TraceInfo *tinfo; |
| 294 | jvmtiError error; |
| 295 | |
| 296 | tinfo = NULL; |
| 297 | if ( thread != NULL ) { |
| 298 | static Trace empty; |
| 299 | Trace trace; |
| 300 | |
| 301 | /* Before VM_INIT thread could be NULL, watch out */ |
| 302 | trace = empty; |
| 303 | error = (*jvmti)->GetStackTrace(jvmti, thread, 0, MAX_FRAMES+2, |
| 304 | trace.frames, &(trace.nframes)); |
| 305 | /* If we get a PHASE error, the VM isn't ready, or it died */ |
| 306 | if ( error == JVMTI_ERROR_WRONG_PHASE ) { |
| 307 | /* It is assumed this is before VM_INIT */ |
| 308 | if ( flavor == TRACE_USER ) { |
| 309 | tinfo = emptyTrace(TRACE_BEFORE_VM_INIT); |
| 310 | } else { |
| 311 | tinfo = emptyTrace(flavor); |
| 312 | } |
| 313 | } else { |
| 314 | check_jvmti_error(jvmti, error, "Cannot get stack trace"); |
| 315 | /* Lookup this entry */ |
| 316 | tinfo = lookupOrEnter(jvmti, &trace, flavor); |
| 317 | } |
| 318 | } else { |
| 319 | /* If thread==NULL, it's assumed this is before VM_START */ |
| 320 | if ( flavor == TRACE_USER ) { |
| 321 | tinfo = emptyTrace(TRACE_BEFORE_VM_START); |
| 322 | } else { |
| 323 | tinfo = emptyTrace(flavor); |
| 324 | } |
| 325 | } |
| 326 | return tinfo; |
| 327 | } |
| 328 | |
| 329 | /* Tag an object with a TraceInfo pointer. */ |
| 330 | static void |
| 331 | tagObjectWithTraceInfo(jvmtiEnv *jvmti, jobject object, TraceInfo *tinfo) |
| 332 | { |
| 333 | jvmtiError error; |
| 334 | jlong tag; |
| 335 | |
| 336 | /* Tag this object with this TraceInfo pointer */ |
| 337 | tag = (jlong)(ptrdiff_t)(void*)tinfo; |
| 338 | error = (*jvmti)->SetTag(jvmti, object, tag); |
| 339 | check_jvmti_error(jvmti, error, "Cannot tag object"); |
| 340 | } |
| 341 | |
| 342 | /* Java Native Method for Object.<init> */ |
| 343 | static void |
| 344 | HEAP_TRACKER_native_newobj(JNIEnv *env, jclass klass, jthread thread, jobject o) |
| 345 | { |
| 346 | TraceInfo *tinfo; |
| 347 | |
| 348 | if ( gdata->vmDead ) { |
| 349 | return; |
| 350 | } |
| 351 | tinfo = findTraceInfo(gdata->jvmti, thread, TRACE_USER); |
| 352 | tagObjectWithTraceInfo(gdata->jvmti, o, tinfo); |
| 353 | } |
| 354 | |
| 355 | /* Java Native Method for newarray */ |
| 356 | static void |
| 357 | HEAP_TRACKER_native_newarr(JNIEnv *env, jclass klass, jthread thread, jobject a) |
| 358 | { |
| 359 | TraceInfo *tinfo; |
| 360 | |
| 361 | if ( gdata->vmDead ) { |
| 362 | return; |
| 363 | } |
| 364 | tinfo = findTraceInfo(gdata->jvmti, thread, TRACE_USER); |
| 365 | tagObjectWithTraceInfo(gdata->jvmti, a, tinfo); |
| 366 | } |
| 367 | |
| 368 | /* Callback for JVMTI_EVENT_VM_START */ |
| 369 | static void JNICALL |
| 370 | cbVMStart(jvmtiEnv *jvmti, JNIEnv *env) |
| 371 | { |
| 372 | enterCriticalSection(jvmti); { |
| 373 | jclass klass; |
| 374 | jfieldID field; |
| 375 | jint rc; |
| 376 | |
| 377 | /* Java Native Methods for class */ |
| 378 | static JNINativeMethod registry[2] = { |
| 379 | {STRING(HEAP_TRACKER_native_newobj), "(Ljava/lang/Object;Ljava/lang/Object;)V", |
| 380 | (void*)&HEAP_TRACKER_native_newobj}, |
| 381 | {STRING(HEAP_TRACKER_native_newarr), "(Ljava/lang/Object;Ljava/lang/Object;)V", |
| 382 | (void*)&HEAP_TRACKER_native_newarr} |
| 383 | }; |
| 384 | |
| 385 | /* Register Natives for class whose methods we use */ |
| 386 | klass = (*env)->FindClass(env, STRING(HEAP_TRACKER_class)); |
| 387 | if ( klass == NULL ) { |
| 388 | fatal_error("ERROR: JNI: Cannot find %s with FindClass\n", |
| 389 | STRING(HEAP_TRACKER_class)); |
| 390 | } |
| 391 | rc = (*env)->RegisterNatives(env, klass, registry, 2); |
| 392 | if ( rc != 0 ) { |
| 393 | fatal_error("ERROR: JNI: Cannot register natives for class %s\n", |
| 394 | STRING(HEAP_TRACKER_class)); |
| 395 | } |
| 396 | |
| 397 | /* Engage calls. */ |
| 398 | field = (*env)->GetStaticFieldID(env, klass, STRING(HEAP_TRACKER_engaged), "I"); |
| 399 | if ( field == NULL ) { |
| 400 | fatal_error("ERROR: JNI: Cannot get field from %s\n", |
| 401 | STRING(HEAP_TRACKER_class)); |
| 402 | } |
| 403 | (*env)->SetStaticIntField(env, klass, field, 1); |
| 404 | |
| 405 | /* Indicate VM has started */ |
| 406 | gdata->vmStarted = JNI_TRUE; |
| 407 | |
| 408 | } exitCriticalSection(jvmti); |
| 409 | } |
| 410 | |
| 411 | /* Iterate Through Heap callback */ |
| 412 | static jint JNICALL |
| 413 | cbObjectTagger(jlong class_tag, jlong size, jlong* tag_ptr, jint length, |
| 414 | void *user_data) |
| 415 | { |
| 416 | TraceInfo *tinfo; |
| 417 | |
| 418 | tinfo = emptyTrace(TRACE_BEFORE_VM_INIT); |
| 419 | *tag_ptr = (jlong)(ptrdiff_t)(void*)tinfo; |
| 420 | return JVMTI_VISIT_OBJECTS; |
| 421 | } |
| 422 | |
| 423 | /* Callback for JVMTI_EVENT_VM_INIT */ |
| 424 | static void JNICALL |
| 425 | cbVMInit(jvmtiEnv *jvmti, JNIEnv *env, jthread thread) |
| 426 | { |
| 427 | jvmtiHeapCallbacks heapCallbacks; |
| 428 | jvmtiError error; |
| 429 | |
| 430 | /* Iterate through heap, find all untagged objects allocated before this */ |
| 431 | (void)memset(&heapCallbacks, 0, sizeof(heapCallbacks)); |
| 432 | heapCallbacks.heap_iteration_callback = &cbObjectTagger; |
| 433 | error = (*jvmti)->IterateThroughHeap(jvmti, JVMTI_HEAP_FILTER_TAGGED, |
| 434 | NULL, &heapCallbacks, NULL); |
| 435 | check_jvmti_error(jvmti, error, "Cannot iterate through heap"); |
| 436 | |
| 437 | enterCriticalSection(jvmti); { |
| 438 | |
| 439 | /* Indicate VM is initialized */ |
| 440 | gdata->vmInitialized = JNI_TRUE; |
| 441 | |
| 442 | } exitCriticalSection(jvmti); |
| 443 | } |
| 444 | |
| 445 | /* Iterate Through Heap callback */ |
| 446 | static jint JNICALL |
| 447 | cbObjectSpaceCounter(jlong class_tag, jlong size, jlong* tag_ptr, jint length, |
| 448 | void *user_data) |
| 449 | { |
| 450 | TraceInfo *tinfo; |
| 451 | |
| 452 | tinfo = (TraceInfo*)(ptrdiff_t)(*tag_ptr); |
| 453 | if ( tinfo == NULL ) { |
| 454 | tinfo = emptyTrace(TRACE_MYSTERY); |
| 455 | *tag_ptr = (jlong)(ptrdiff_t)(void*)tinfo; |
| 456 | } |
| 457 | tinfo->totalSpace += size; |
| 458 | return JVMTI_VISIT_OBJECTS; |
| 459 | } |
| 460 | |
| 461 | /* Qsort compare function */ |
| 462 | static int |
| 463 | compareInfo(const void *p1, const void *p2) |
| 464 | { |
| 465 | TraceInfo *tinfo1, *tinfo2; |
| 466 | |
| 467 | tinfo1 = *((TraceInfo**)p1); |
| 468 | tinfo2 = *((TraceInfo**)p2); |
| 469 | return (int)(tinfo2->totalSpace - tinfo1->totalSpace); |
| 470 | } |
| 471 | |
| 472 | /* Frame to text */ |
| 473 | static void |
| 474 | frameToString(jvmtiEnv *jvmti, char *buf, int buflen, jvmtiFrameInfo *finfo) |
| 475 | { |
| 476 | jvmtiError error; |
| 477 | jclass klass; |
| 478 | char *signature; |
| 479 | char *methodname; |
| 480 | char *methodsig; |
| 481 | jboolean isNative; |
| 482 | char *filename; |
| 483 | int lineCount; |
| 484 | jvmtiLineNumberEntry*lineTable; |
| 485 | int lineNumber; |
| 486 | |
| 487 | /* Initialize defaults */ |
| 488 | buf[0] = 0; |
| 489 | klass = NULL; |
| 490 | signature = NULL; |
| 491 | methodname = NULL; |
| 492 | methodsig = NULL; |
| 493 | isNative = JNI_FALSE; |
| 494 | filename = NULL; |
| 495 | lineCount = 0; |
| 496 | lineTable = NULL; |
| 497 | lineNumber = 0; |
| 498 | |
| 499 | /* Get jclass object for the jmethodID */ |
| 500 | error = (*jvmti)->GetMethodDeclaringClass(jvmti, finfo->method, &klass); |
| 501 | check_jvmti_error(jvmti, error, "Cannot get method's class"); |
| 502 | |
| 503 | /* Get the class signature */ |
| 504 | error = (*jvmti)->GetClassSignature(jvmti, klass, &signature, NULL); |
| 505 | check_jvmti_error(jvmti, error, "Cannot get class signature"); |
| 506 | |
| 507 | /* Skip all this if it's our own Tracker method */ |
| 508 | if ( strcmp(signature, "L" STRING(HEAP_TRACKER_class) ";" ) == 0 ) { |
| 509 | deallocate(jvmti, signature); |
| 510 | return; |
| 511 | } |
| 512 | |
| 513 | /* Get the name and signature for the method */ |
| 514 | error = (*jvmti)->GetMethodName(jvmti, finfo->method, |
| 515 | &methodname, &methodsig, NULL); |
| 516 | check_jvmti_error(jvmti, error, "Cannot method name"); |
| 517 | |
| 518 | /* Check to see if it's a native method, which means no lineNumber */ |
| 519 | error = (*jvmti)->IsMethodNative(jvmti, finfo->method, &isNative); |
| 520 | check_jvmti_error(jvmti, error, "Cannot get method native status"); |
| 521 | |
| 522 | /* Get source file name */ |
| 523 | error = (*jvmti)->GetSourceFileName(jvmti, klass, &filename); |
| 524 | if ( error != JVMTI_ERROR_NONE && error != JVMTI_ERROR_ABSENT_INFORMATION ) { |
| 525 | check_jvmti_error(jvmti, error, "Cannot get source filename"); |
| 526 | } |
| 527 | |
| 528 | /* Get lineNumber if we can */ |
| 529 | if ( !isNative ) { |
| 530 | int i; |
| 531 | |
| 532 | /* Get method line table */ |
| 533 | error = (*jvmti)->GetLineNumberTable(jvmti, finfo->method, &lineCount, &lineTable); |
| 534 | if ( error == JVMTI_ERROR_NONE ) { |
| 535 | /* Search for line */ |
| 536 | lineNumber = lineTable[0].line_number; |
| 537 | for ( i = 1 ; i < lineCount ; i++ ) { |
| 538 | if ( finfo->location < lineTable[i].start_location ) { |
| 539 | break; |
| 540 | } |
| 541 | lineNumber = lineTable[i].line_number; |
| 542 | } |
| 543 | } else if ( error != JVMTI_ERROR_ABSENT_INFORMATION ) { |
| 544 | check_jvmti_error(jvmti, error, "Cannot get method line table"); |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /* Create string for this frame location. |
| 549 | * NOTE: These char* quantities are mUTF (Modified UTF-8) bytes |
| 550 | * and should actually be converted to the default system |
| 551 | * character encoding. Sending them to things like |
| 552 | * printf() without converting them is actually an I18n |
| 553 | * (Internationalization) error. |
| 554 | */ |
| 555 | (void)sprintf(buf, "%s.%s@%d[%s:%d]", |
| 556 | (signature==NULL?"UnknownClass":signature), |
| 557 | (methodname==NULL?"UnknownMethod":methodname), |
| 558 | (int)finfo->location, |
| 559 | (filename==NULL?"UnknownFile":filename), |
| 560 | lineNumber); |
| 561 | |
| 562 | /* Free up JVMTI space allocated by the above calls */ |
| 563 | deallocate(jvmti, signature); |
| 564 | deallocate(jvmti, methodname); |
| 565 | deallocate(jvmti, methodsig); |
| 566 | deallocate(jvmti, filename); |
| 567 | deallocate(jvmti, lineTable); |
| 568 | } |
| 569 | |
| 570 | /* Print the information */ |
| 571 | static void |
| 572 | printTraceInfo(jvmtiEnv *jvmti, int index, TraceInfo* tinfo) |
| 573 | { |
| 574 | if ( tinfo == NULL ) { |
| 575 | fatal_error("%d: NULL ENTRY ERROR\n", index); |
| 576 | return; |
| 577 | } |
| 578 | |
| 579 | stdout_message("%2d: %7d bytes %5d objects %5d live %s", |
| 580 | index, (int)tinfo->totalSpace, tinfo->totalCount, |
| 581 | tinfo->useCount, flavorDesc[tinfo->trace.flavor]); |
| 582 | |
| 583 | if ( tinfo->trace.nframes > 0 ) { |
| 584 | int i; |
| 585 | int fcount; |
| 586 | |
| 587 | fcount = 0; |
| 588 | stdout_message(" stack=("); |
| 589 | for ( i = 0 ; i < tinfo->trace.nframes ; i++ ) { |
| 590 | char buf[4096]; |
| 591 | |
| 592 | frameToString(jvmti, buf, (int)sizeof(buf), tinfo->trace.frames+i); |
| 593 | if ( buf[0] == 0 ) { |
| 594 | continue; /* Skip the ones that are from Tracker class */ |
| 595 | } |
| 596 | fcount++; |
| 597 | stdout_message("%s", buf); |
| 598 | if ( i < (tinfo->trace.nframes-1) ) { |
| 599 | stdout_message(","); |
| 600 | } |
| 601 | } |
| 602 | stdout_message(") nframes=%d\n", fcount); |
| 603 | } else { |
| 604 | stdout_message(" stack=<empty>\n"); |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | /* Callback for JVMTI_EVENT_VM_DEATH */ |
| 609 | static void JNICALL |
| 610 | cbVMDeath(jvmtiEnv *jvmti, JNIEnv *env) |
| 611 | { |
| 612 | jvmtiHeapCallbacks heapCallbacks; |
| 613 | jvmtiError error; |
| 614 | |
| 615 | /* These are purposely done outside the critical section */ |
| 616 | |
| 617 | /* Force garbage collection now so we get our ObjectFree calls */ |
| 618 | error = (*jvmti)->ForceGarbageCollection(jvmti); |
| 619 | check_jvmti_error(jvmti, error, "Cannot force garbage collection"); |
| 620 | |
| 621 | /* Iterate through heap and find all objects */ |
| 622 | (void)memset(&heapCallbacks, 0, sizeof(heapCallbacks)); |
| 623 | heapCallbacks.heap_iteration_callback = &cbObjectSpaceCounter; |
| 624 | error = (*jvmti)->IterateThroughHeap(jvmti, 0, NULL, &heapCallbacks, NULL); |
| 625 | check_jvmti_error(jvmti, error, "Cannot iterate through heap"); |
| 626 | |
| 627 | /* Process VM Death */ |
| 628 | enterCriticalSection(jvmti); { |
| 629 | jclass klass; |
| 630 | jfieldID field; |
| 631 | jvmtiEventCallbacks callbacks; |
| 632 | |
| 633 | /* Disengage calls in HEAP_TRACKER_class. */ |
| 634 | klass = (*env)->FindClass(env, STRING(HEAP_TRACKER_class)); |
| 635 | if ( klass == NULL ) { |
| 636 | fatal_error("ERROR: JNI: Cannot find %s with FindClass\n", |
| 637 | STRING(HEAP_TRACKER_class)); |
| 638 | } |
| 639 | field = (*env)->GetStaticFieldID(env, klass, STRING(HEAP_TRACKER_engaged), "I"); |
| 640 | if ( field == NULL ) { |
| 641 | fatal_error("ERROR: JNI: Cannot get field from %s\n", |
| 642 | STRING(HEAP_TRACKER_class)); |
| 643 | } |
| 644 | (*env)->SetStaticIntField(env, klass, field, 0); |
| 645 | |
| 646 | /* The critical section here is important to hold back the VM death |
| 647 | * until all other callbacks have completed. |
| 648 | */ |
| 649 | |
| 650 | /* Clear out all callbacks. */ |
| 651 | (void)memset(&callbacks,0, sizeof(callbacks)); |
| 652 | error = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, |
| 653 | (jint)sizeof(callbacks)); |
| 654 | check_jvmti_error(jvmti, error, "Cannot set jvmti callbacks"); |
| 655 | |
| 656 | /* Since this critical section could be holding up other threads |
| 657 | * in other event callbacks, we need to indicate that the VM is |
| 658 | * dead so that the other callbacks can short circuit their work. |
| 659 | * We don't expect an further events after VmDeath but we do need |
| 660 | * to be careful that existing threads might be in our own agent |
| 661 | * callback code. |
| 662 | */ |
| 663 | gdata->vmDead = JNI_TRUE; |
| 664 | |
| 665 | /* Dump all objects */ |
| 666 | if ( gdata->traceInfoCount > 0 ) { |
| 667 | TraceInfo **list; |
| 668 | int count; |
| 669 | int i; |
| 670 | |
| 671 | stdout_message("Dumping heap trace information\n"); |
| 672 | |
| 673 | /* Create single array of pointers to TraceInfo's, sort, and |
| 674 | * print top gdata->maxDump top space users. |
| 675 | */ |
| 676 | list = (TraceInfo**)calloc(gdata->traceInfoCount, |
| 677 | sizeof(TraceInfo*)); |
| 678 | if ( list == NULL ) { |
| 679 | fatal_error("ERROR: Ran out of malloc() space\n"); |
| 680 | } |
| 681 | count = 0; |
| 682 | for ( i = 0 ; i < HASH_BUCKET_COUNT ; i++ ) { |
| 683 | TraceInfo *tinfo; |
| 684 | |
| 685 | tinfo = gdata->hashBuckets[i]; |
| 686 | while ( tinfo != NULL ) { |
| 687 | if ( count < gdata->traceInfoCount ) { |
| 688 | list[count++] = tinfo; |
| 689 | } |
| 690 | tinfo = tinfo->next; |
| 691 | } |
| 692 | } |
| 693 | if ( count != gdata->traceInfoCount ) { |
| 694 | fatal_error("ERROR: Count found by iterate doesn't match ours:" |
| 695 | " count=%d != traceInfoCount==%d\n", |
| 696 | count, gdata->traceInfoCount); |
| 697 | } |
| 698 | qsort(list, count, sizeof(TraceInfo*), &compareInfo); |
| 699 | for ( i = 0 ; i < count ; i++ ) { |
| 700 | if ( i >= gdata->maxDump ) { |
| 701 | break; |
| 702 | } |
| 703 | printTraceInfo(jvmti, i+1, list[i]); |
| 704 | } |
| 705 | (void)free(list); |
| 706 | } |
| 707 | |
| 708 | } exitCriticalSection(jvmti); |
| 709 | |
| 710 | } |
| 711 | |
| 712 | /* Callback for JVMTI_EVENT_VM_OBJECT_ALLOC */ |
| 713 | static void JNICALL |
| 714 | cbVMObjectAlloc(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, |
| 715 | jobject object, jclass object_klass, jlong size) |
| 716 | { |
| 717 | TraceInfo *tinfo; |
| 718 | |
| 719 | if ( gdata->vmDead ) { |
| 720 | return; |
| 721 | } |
| 722 | tinfo = findTraceInfo(jvmti, thread, TRACE_VM_OBJECT); |
| 723 | tagObjectWithTraceInfo(jvmti, object, tinfo); |
| 724 | } |
| 725 | |
| 726 | /* Callback for JVMTI_EVENT_OBJECT_FREE */ |
| 727 | static void JNICALL |
| 728 | cbObjectFree(jvmtiEnv *jvmti, jlong tag) |
| 729 | { |
| 730 | TraceInfo *tinfo; |
| 731 | |
| 732 | if ( gdata->vmDead ) { |
| 733 | return; |
| 734 | } |
| 735 | |
| 736 | /* The object tag is actually a pointer to a TraceInfo structure */ |
| 737 | tinfo = (TraceInfo*)(void*)(ptrdiff_t)tag; |
| 738 | |
| 739 | /* Decrement the use count */ |
| 740 | tinfo->useCount--; |
| 741 | } |
| 742 | |
| 743 | /* Callback for JVMTI_EVENT_CLASS_FILE_LOAD_HOOK */ |
| 744 | static void JNICALL |
| 745 | cbClassFileLoadHook(jvmtiEnv *jvmti, JNIEnv* env, |
| 746 | jclass class_being_redefined, jobject loader, |
| 747 | const char* name, jobject protection_domain, |
| 748 | jint class_data_len, const unsigned char* class_data, |
| 749 | jint* new_class_data_len, unsigned char** new_class_data) |
| 750 | { |
| 751 | enterCriticalSection(jvmti); { |
| 752 | /* It's possible we get here right after VmDeath event, be careful */ |
| 753 | if ( !gdata->vmDead ) { |
| 754 | |
| 755 | const char * classname; |
| 756 | |
| 757 | /* Name can be NULL, make sure we avoid SEGV's */ |
| 758 | if ( name == NULL ) { |
| 759 | classname = java_crw_demo_classname(class_data, class_data_len, |
| 760 | NULL); |
| 761 | if ( classname == NULL ) { |
| 762 | fatal_error("ERROR: No classname in classfile\n"); |
| 763 | } |
| 764 | } else { |
| 765 | classname = strdup(name); |
| 766 | if ( classname == NULL ) { |
| 767 | fatal_error("ERROR: Ran out of malloc() space\n"); |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | *new_class_data_len = 0; |
| 772 | *new_class_data = NULL; |
| 773 | |
| 774 | /* The tracker class itself? */ |
| 775 | if ( strcmp(classname, STRING(HEAP_TRACKER_class)) != 0 ) { |
| 776 | jint cnum; |
| 777 | int systemClass; |
| 778 | unsigned char *newImage; |
| 779 | long newLength; |
| 780 | |
| 781 | /* Get number for every class file image loaded */ |
| 782 | cnum = gdata->ccount++; |
| 783 | |
| 784 | /* Is it a system class? If the class load is before VmStart |
| 785 | * then we will consider it a system class that should |
| 786 | * be treated carefully. (See java_crw_demo) |
| 787 | */ |
| 788 | systemClass = 0; |
| 789 | if ( !gdata->vmStarted ) { |
| 790 | systemClass = 1; |
| 791 | } |
| 792 | |
| 793 | newImage = NULL; |
| 794 | newLength = 0; |
| 795 | |
| 796 | /* Call the class file reader/write demo code */ |
| 797 | java_crw_demo(cnum, |
| 798 | classname, |
| 799 | class_data, |
| 800 | class_data_len, |
| 801 | systemClass, |
| 802 | STRING(HEAP_TRACKER_class), |
| 803 | "L" STRING(HEAP_TRACKER_class) ";", |
| 804 | NULL, NULL, |
| 805 | NULL, NULL, |
| 806 | STRING(HEAP_TRACKER_newobj), "(Ljava/lang/Object;)V", |
| 807 | STRING(HEAP_TRACKER_newarr), "(Ljava/lang/Object;)V", |
| 808 | &newImage, |
| 809 | &newLength, |
| 810 | NULL, |
| 811 | NULL); |
| 812 | |
| 813 | /* If we got back a new class image, return it back as "the" |
| 814 | * new class image. This must be JVMTI Allocate space. |
| 815 | */ |
| 816 | if ( newLength > 0 ) { |
| 817 | unsigned char *jvmti_space; |
| 818 | |
| 819 | jvmti_space = (unsigned char *)allocate(jvmti, (jint)newLength); |
| 820 | (void)memcpy((void*)jvmti_space, (void*)newImage, (int)newLength); |
| 821 | *new_class_data_len = (jint)newLength; |
| 822 | *new_class_data = jvmti_space; /* VM will deallocate */ |
| 823 | } |
| 824 | |
| 825 | /* Always free up the space we get from java_crw_demo() */ |
| 826 | if ( newImage != NULL ) { |
| 827 | (void)free((void*)newImage); /* Free malloc() space with free() */ |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | (void)free((void*)classname); |
| 832 | } |
| 833 | } exitCriticalSection(jvmti); |
| 834 | } |
| 835 | |
| 836 | /* Parse the options for this heapTracker agent */ |
| 837 | static void |
| 838 | parse_agent_options(char *options) |
| 839 | { |
| 840 | #define MAX_TOKEN_LENGTH 16 |
| 841 | char token[MAX_TOKEN_LENGTH]; |
| 842 | char *next; |
| 843 | |
| 844 | /* Defaults */ |
| 845 | gdata->maxDump = 20; |
| 846 | |
| 847 | /* Parse options and set flags in gdata */ |
| 848 | if ( options==NULL ) { |
| 849 | return; |
| 850 | } |
| 851 | |
| 852 | /* Get the first token from the options string. */ |
| 853 | next = get_token(options, ",=", token, (int)sizeof(token)); |
| 854 | |
| 855 | /* While not at the end of the options string, process this option. */ |
| 856 | while ( next != NULL ) { |
| 857 | if ( strcmp(token,"help")==0 ) { |
| 858 | stdout_message("The heapTracker JVMTI demo agent\n"); |
| 859 | stdout_message("\n"); |
| 860 | stdout_message(" java -agent:heapTracker[=options] ...\n"); |
| 861 | stdout_message("\n"); |
| 862 | stdout_message("The options are comma separated:\n"); |
| 863 | stdout_message("\t help\t\t\t Print help information\n"); |
| 864 | stdout_message("\t maxDump=n\t\t\t How many TraceInfo's to dump\n"); |
| 865 | stdout_message("\n"); |
| 866 | exit(0); |
| 867 | } else if ( strcmp(token,"maxDump")==0 ) { |
| 868 | char number[MAX_TOKEN_LENGTH]; |
| 869 | |
| 870 | next = get_token(next, ",=", number, (int)sizeof(number)); |
| 871 | if ( next == NULL ) { |
| 872 | fatal_error("ERROR: Cannot parse maxDump=number: %s\n", options); |
| 873 | } |
| 874 | gdata->maxDump = atoi(number); |
| 875 | } else if ( token[0]!=0 ) { |
| 876 | /* We got a non-empty token and we don't know what it is. */ |
| 877 | fatal_error("ERROR: Unknown option: %s\n", token); |
| 878 | } |
| 879 | /* Get the next token (returns NULL if there are no more) */ |
| 880 | next = get_token(next, ",=", token, (int)sizeof(token)); |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | /* Agent_OnLoad: This is called immediately after the shared library is |
| 885 | * loaded. This is the first code executed. |
| 886 | */ |
| 887 | JNIEXPORT jint JNICALL |
| 888 | Agent_OnLoad(JavaVM *vm, char *options, void *reserved) |
| 889 | { |
| 890 | static GlobalAgentData data; |
| 891 | jvmtiEnv *jvmti; |
| 892 | jvmtiError error; |
| 893 | jint res; |
| 894 | TraceFlavor flavor; |
| 895 | jvmtiCapabilities capabilities; |
| 896 | jvmtiEventCallbacks callbacks; |
| 897 | static Trace empty; |
| 898 | |
| 899 | /* Setup initial global agent data area |
| 900 | * Use of static/extern data should be handled carefully here. |
| 901 | * We need to make sure that we are able to cleanup after ourselves |
| 902 | * so anything allocated in this library needs to be freed in |
| 903 | * the Agent_OnUnload() function. |
| 904 | */ |
| 905 | (void)memset((void*)&data, 0, sizeof(data)); |
| 906 | gdata = &data; |
| 907 | |
| 908 | /* First thing we need to do is get the jvmtiEnv* or JVMTI environment */ |
| 909 | res = (*vm)->GetEnv(vm, (void **)&jvmti, JVMTI_VERSION_1); |
| 910 | if (res != JNI_OK) { |
| 911 | /* This means that the VM was unable to obtain this version of the |
| 912 | * JVMTI interface, this is a fatal error. |
| 913 | */ |
| 914 | fatal_error("ERROR: Unable to access JVMTI Version 1 (0x%x)," |
| 915 | " is your JDK a 5.0 or newer version?" |
| 916 | " JNIEnv's GetEnv() returned %d\n", |
| 917 | JVMTI_VERSION_1, res); |
| 918 | } |
| 919 | |
| 920 | /* Here we save the jvmtiEnv* for Agent_OnUnload(). */ |
| 921 | gdata->jvmti = jvmti; |
| 922 | |
| 923 | /* Parse any options supplied on java command line */ |
| 924 | parse_agent_options(options); |
| 925 | |
| 926 | /* Immediately after getting the jvmtiEnv* we need to ask for the |
| 927 | * capabilities this agent will need. |
| 928 | */ |
| 929 | (void)memset(&capabilities,0, sizeof(capabilities)); |
| 930 | capabilities.can_generate_all_class_hook_events = 1; |
| 931 | capabilities.can_tag_objects = 1; |
| 932 | capabilities.can_generate_object_free_events = 1; |
| 933 | capabilities.can_get_source_file_name = 1; |
| 934 | capabilities.can_get_line_numbers = 1; |
| 935 | capabilities.can_generate_vm_object_alloc_events = 1; |
| 936 | error = (*jvmti)->AddCapabilities(jvmti, &capabilities); |
| 937 | check_jvmti_error(jvmti, error, "Unable to get necessary JVMTI capabilities."); |
| 938 | |
| 939 | /* Next we need to provide the pointers to the callback functions to |
| 940 | * to this jvmtiEnv* |
| 941 | */ |
| 942 | (void)memset(&callbacks,0, sizeof(callbacks)); |
| 943 | /* JVMTI_EVENT_VM_START */ |
| 944 | callbacks.VMStart = &cbVMStart; |
| 945 | /* JVMTI_EVENT_VM_INIT */ |
| 946 | callbacks.VMInit = &cbVMInit; |
| 947 | /* JVMTI_EVENT_VM_DEATH */ |
| 948 | callbacks.VMDeath = &cbVMDeath; |
| 949 | /* JVMTI_EVENT_OBJECT_FREE */ |
| 950 | callbacks.ObjectFree = &cbObjectFree; |
| 951 | /* JVMTI_EVENT_VM_OBJECT_ALLOC */ |
| 952 | callbacks.VMObjectAlloc = &cbVMObjectAlloc; |
| 953 | /* JVMTI_EVENT_CLASS_FILE_LOAD_HOOK */ |
| 954 | callbacks.ClassFileLoadHook = &cbClassFileLoadHook; |
| 955 | error = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, (jint)sizeof(callbacks)); |
| 956 | check_jvmti_error(jvmti, error, "Cannot set jvmti callbacks"); |
| 957 | |
| 958 | /* At first the only initial events we are interested in are VM |
| 959 | * initialization, VM death, and Class File Loads. |
| 960 | * Once the VM is initialized we will request more events. |
| 961 | */ |
| 962 | error = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 963 | JVMTI_EVENT_VM_START, (jthread)NULL); |
| 964 | check_jvmti_error(jvmti, error, "Cannot set event notification"); |
| 965 | error = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 966 | JVMTI_EVENT_VM_INIT, (jthread)NULL); |
| 967 | check_jvmti_error(jvmti, error, "Cannot set event notification"); |
| 968 | error = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 969 | JVMTI_EVENT_VM_DEATH, (jthread)NULL); |
| 970 | check_jvmti_error(jvmti, error, "Cannot set event notification"); |
| 971 | error = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 972 | JVMTI_EVENT_OBJECT_FREE, (jthread)NULL); |
| 973 | check_jvmti_error(jvmti, error, "Cannot set event notification"); |
| 974 | error = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 975 | JVMTI_EVENT_VM_OBJECT_ALLOC, (jthread)NULL); |
| 976 | check_jvmti_error(jvmti, error, "Cannot set event notification"); |
| 977 | error = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 978 | JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, (jthread)NULL); |
| 979 | check_jvmti_error(jvmti, error, "Cannot set event notification"); |
| 980 | |
| 981 | /* Here we create a raw monitor for our use in this agent to |
| 982 | * protect critical sections of code. |
| 983 | */ |
| 984 | error = (*jvmti)->CreateRawMonitor(jvmti, "agent data", &(gdata->lock)); |
| 985 | check_jvmti_error(jvmti, error, "Cannot create raw monitor"); |
| 986 | |
| 987 | /* Create the TraceInfo for various flavors of empty traces */ |
| 988 | for ( flavor = TRACE_FIRST ; flavor <= TRACE_LAST ; flavor++ ) { |
| 989 | gdata->emptyTrace[flavor] = |
| 990 | newTraceInfo(&empty, hashTrace(&empty), flavor); |
| 991 | } |
| 992 | |
| 993 | /* Add jar file to boot classpath */ |
| 994 | add_demo_jar_to_bootclasspath(jvmti, "heapTracker"); |
| 995 | |
| 996 | /* We return JNI_OK to signify success */ |
| 997 | return JNI_OK; |
| 998 | } |
| 999 | |
| 1000 | /* Agent_OnUnload: This is called immediately before the shared library is |
| 1001 | * unloaded. This is the last code executed. |
| 1002 | */ |
| 1003 | JNIEXPORT void JNICALL |
| 1004 | Agent_OnUnload(JavaVM *vm) |
| 1005 | { |
| 1006 | /* Skip any cleanup, VM is about to die anyway */ |
| 1007 | } |