--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/handles.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,221 @@
+/*
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "memory/allocation.inline.hpp"
+#include "oops/constantPool.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/thread.inline.hpp"
+
+#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(oopDesc::is_oop(obj), "not an oop: " INTPTR_FORMAT, p2i(obj));
+ return real_allocate_handle(obj);
+}
+#endif
+
+// Copy constructors and destructors for metadata handles
+// These do too much to inline.
+#define DEF_METADATA_HANDLE_FN_NOINLINE(name, type) \
+name##Handle::name##Handle(const name##Handle &h) { \
+ _value = h._value; \
+ if (_value != NULL) { \
+ assert(_value->is_valid(), "obj is valid"); \
+ if (h._thread != NULL) { \
+ assert(h._thread == Thread::current(), "thread must be current");\
+ _thread = h._thread; \
+ } else { \
+ _thread = Thread::current(); \
+ } \
+ assert (_thread->is_in_stack((address)this), "not on stack?"); \
+ _thread->metadata_handles()->push((Metadata*)_value); \
+ } else { \
+ _thread = NULL; \
+ } \
+} \
+name##Handle& name##Handle::operator=(const name##Handle &s) { \
+ remove(); \
+ _value = s._value; \
+ if (_value != NULL) { \
+ assert(_value->is_valid(), "obj is valid"); \
+ if (s._thread != NULL) { \
+ assert(s._thread == Thread::current(), "thread must be current");\
+ _thread = s._thread; \
+ } else { \
+ _thread = Thread::current(); \
+ } \
+ assert (_thread->is_in_stack((address)this), "not on stack?"); \
+ _thread->metadata_handles()->push((Metadata*)_value); \
+ } else { \
+ _thread = NULL; \
+ } \
+ return *this; \
+} \
+inline void name##Handle::remove() { \
+ if (_value != NULL) { \
+ int i = _thread->metadata_handles()->find_from_end((Metadata*)_value); \
+ assert(i!=-1, "not in metadata_handles list"); \
+ _thread->metadata_handles()->remove_at(i); \
+ } \
+} \
+name##Handle::~name##Handle () { remove(); } \
+
+DEF_METADATA_HANDLE_FN_NOINLINE(method, Method)
+DEF_METADATA_HANDLE_FN_NOINLINE(constantPool, ConstantPool)
+
+
+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) {
+ // This test can be moved up but for now check every oop.
+
+ assert(oopDesc::is_oop(*bottom), "handle should point to oop");
+
+ 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();
+ }
+
+ 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;
+ _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--);
+
+ // Delete later chunks
+ if( _chunk->next() ) {
+ // reset arena size before delete chunks. Otherwise, the total
+ // arena size could exceed total chunk size
+ assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
+ area->set_size_in_bytes(size_in_bytes());
+ _chunk->next_chop();
+ } else {
+ assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
+ }
+ // Roll back arena to saved top markers
+ area->_chunk = _chunk;
+ area->_hwm = _hwm;
+ area->_max = _max;
+#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());
+}
+
+void* HandleMark::operator new(size_t size) throw() {
+ return AllocateHeap(size, mtThread);
+}
+
+void* HandleMark::operator new [] (size_t size) throw() {
+ return AllocateHeap(size, mtThread);
+}
+
+void HandleMark::operator delete(void* p) {
+ FreeHeap(p);
+}
+
+void HandleMark::operator delete[](void* p) {
+ FreeHeap(p);
+}
+
+#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