--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/handles.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,185 @@
+/*
+ * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_handles.cpp.incl"
+
+#ifdef ASSERT
+oop* HandleArea::allocate_handle(oop obj) {
+ assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark");
+ assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark");
+ assert(SharedSkipVerify || obj->is_oop(), "sanity check");
+ return real_allocate_handle(obj);
+}
+
+Handle::Handle(Thread* thread, oop obj) {
+ assert(thread == Thread::current(), "sanity check");
+ if (obj == NULL) {
+ _handle = NULL;
+ } else {
+ _handle = thread->handle_area()->allocate_handle(obj);
+ }
+}
+
+#endif
+
+static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) {
+ oop* bottom = (oop*) chunk->bottom();
+ oop* top = (oop*) chunk_top;
+ uintx handles_visited = top - bottom;
+ assert(top >= bottom && top <= (oop*) chunk->top(), "just checking");
+ // during GC phase 3, a handle may be a forward pointer that
+ // is not yet valid, so loosen the assertion
+ while (bottom < top) {
+// assert((*bottom)->is_oop(), "handle should point to oop");
+ assert(Universe::heap()->is_in(*bottom), "handle should be valid heap address");
+ f->do_oop(bottom++);
+ }
+ return handles_visited;
+}
+
+// Used for debugging handle allocation.
+NOT_PRODUCT(jint _nof_handlemarks = 0;)
+
+void HandleArea::oops_do(OopClosure* f) {
+ uintx handles_visited = 0;
+ // First handle the current chunk. It is filled to the high water mark.
+ handles_visited += chunk_oops_do(f, _chunk, _hwm);
+ // Then handle all previous chunks. They are completely filled.
+ Chunk* k = _first;
+ while(k != _chunk) {
+ handles_visited += chunk_oops_do(f, k, k->top());
+ k = k->next();
+ }
+
+ // The thread local handle areas should not get very large
+ if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) {
+#ifdef ASSERT
+ warning("%d: Visited in HandleMark : %d",
+ _nof_handlemarks, handles_visited);
+#else
+ warning("Visited in HandleMark : %d", handles_visited);
+#endif
+ }
+ if (_prev != NULL) _prev->oops_do(f);
+}
+
+void HandleMark::initialize(Thread* thread) {
+ _thread = thread;
+ // Save area
+ _area = thread->handle_area();
+ // Save current top
+ _chunk = _area->_chunk;
+ _hwm = _area->_hwm;
+ _max = _area->_max;
+ NOT_PRODUCT(_size_in_bytes = _area->_size_in_bytes;)
+ debug_only(_area->_handle_mark_nesting++);
+ assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks");
+ debug_only(Atomic::inc(&_nof_handlemarks);)
+
+ // Link this in the thread
+ set_previous_handle_mark(thread->last_handle_mark());
+ thread->set_last_handle_mark(this);
+}
+
+
+HandleMark::~HandleMark() {
+ HandleArea* area = _area; // help compilers with poor alias analysis
+ assert(area == _thread->handle_area(), "sanity check");
+ assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" );
+ debug_only(area->_handle_mark_nesting--);
+
+ // Debug code to trace the number of handles allocated per mark/
+#ifdef ASSERT
+ if (TraceHandleAllocation) {
+ size_t handles = 0;
+ Chunk *c = _chunk->next();
+ if (c == NULL) {
+ handles = area->_hwm - _hwm; // no new chunk allocated
+ } else {
+ handles = _max - _hwm; // add rest in first chunk
+ while(c != NULL) {
+ handles += c->length();
+ c = c->next();
+ }
+ handles -= area->_max - area->_hwm; // adjust for last trunk not full
+ }
+ handles /= sizeof(void *); // Adjust for size of a handle
+ if (handles > HandleAllocationLimit) {
+ // Note: _nof_handlemarks is only set in debug mode
+ warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles);
+ }
+ }
+#endif
+
+ // Delete later chunks
+ if( _chunk->next() ) {
+ _chunk->next_chop();
+ }
+ // Roll back arena to saved top markers
+ area->_chunk = _chunk;
+ area->_hwm = _hwm;
+ area->_max = _max;
+ NOT_PRODUCT(area->set_size_in_bytes(_size_in_bytes);)
+#ifdef ASSERT
+ // clear out first chunk (to detect allocation bugs)
+ if (ZapVMHandleArea) {
+ memset(_hwm, badHandleValue, _max - _hwm);
+ }
+ Atomic::dec(&_nof_handlemarks);
+#endif
+
+ // Unlink this from the thread
+ _thread->set_last_handle_mark(previous_handle_mark());
+}
+
+#ifdef ASSERT
+
+NoHandleMark::NoHandleMark() {
+ HandleArea* area = Thread::current()->handle_area();
+ area->_no_handle_mark_nesting++;
+ assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
+}
+
+
+NoHandleMark::~NoHandleMark() {
+ HandleArea* area = Thread::current()->handle_area();
+ assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
+ area->_no_handle_mark_nesting--;
+}
+
+
+ResetNoHandleMark::ResetNoHandleMark() {
+ HandleArea* area = Thread::current()->handle_area();
+ _no_handle_mark_nesting = area->_no_handle_mark_nesting;
+ area->_no_handle_mark_nesting = 0;
+}
+
+
+ResetNoHandleMark::~ResetNoHandleMark() {
+ HandleArea* area = Thread::current()->handle_area();
+ area->_no_handle_mark_nesting = _no_handle_mark_nesting;
+}
+
+#endif