/*
* Copyright (c) 1997, 2018, 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) {
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