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comparison src/share/vm/runtime/jniHandles.cpp @ 24102:d1a869fb73c2

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Performance fix for JNI handle allocation.
author Christian Haeubl <christian.haeubl@oracle.com>
date Tue, 14 Feb 2017 11:10:26 +0100
parents dd9cc155639c
children
comparison
equal deleted inserted replaced
24101:efea6cfade16 24102:d1a869fb73c2
418 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); 418 assert(Universe::heap()->is_in_reserved(obj), "sanity check");
419 if (_top == 0) { 419 if (_top == 0) {
420 // This is the first allocation or the initial block got zapped when 420 // This is the first allocation or the initial block got zapped when
421 // entering a native function. If we have any following blocks they are 421 // entering a native function. If we have any following blocks they are
422 // not valid anymore. 422 // not valid anymore.
423 for (JNIHandleBlock* current = _next; current != NULL; 423 JNIHandleBlock* current = _next;
424 current = current->_next) { 424 while (current != NULL) {
425 assert(current->_last == NULL, "only first block should have _last set"); 425 assert(current->_last == NULL, "only first block should have _last set");
426 assert(current->_free_list == NULL, 426 assert(current->_free_list == NULL,
427 "only first block should have _free_list set"); 427 "only first block should have _free_list set");
428
429 // all blocks after the first free block must already be empty
430 if (current->_top == 0) break;
431
428 current->_top = 0; 432 current->_top = 0;
429 if (ZapJNIHandleArea) current->zap(); 433 if (ZapJNIHandleArea) current->zap();
430 } 434
435 current = current->_next;
436 }
437
438 #ifdef ASSERT
439 while (current != NULL) {
440 assert(current->_top == 0, "all blocks must already have been reset before");
441 current = current->_next;
442 }
443 #endif // ASSERT
444
431 // Clear initial block 445 // Clear initial block
432 _free_list = NULL; 446 _free_list = NULL;
433 _allocate_before_rebuild = 0; 447 _allocate_before_rebuild = 0;
434 _last = this; 448 _last = this;
435 if (ZapJNIHandleArea) zap(); 449 if (ZapJNIHandleArea) zap();