Mercurial > hg > graal-compiler
diff src/share/vm/runtime/handles.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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