/* * 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 "oops/valueKlass.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) { if (Universe::heap()->is_in_reserved_or_null(*bottom)) { f->do_oop(bottom); } 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 // ASSERT