1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "memory/allocation.inline.hpp" 27 #include "oops/constantPool.hpp" 28 #include "oops/oop.inline.hpp" 29 #include "runtime/atomic.hpp" 30 #include "runtime/handles.inline.hpp" 31 #include "runtime/thread.inline.hpp" 32 33 #ifdef ASSERT 34 oop* HandleArea::allocate_handle(oop obj) { 35 assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark"); 36 assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark"); 37 assert(oopDesc::is_oop(obj), "not an oop: " INTPTR_FORMAT, p2i(obj)); 38 return real_allocate_handle(obj); 39 } 40 #endif 41 42 // Copy constructors and destructors for metadata handles 43 // These do too much to inline. 44 #define DEF_METADATA_HANDLE_FN_NOINLINE(name, type) \ 45 name##Handle::name##Handle(const name##Handle &h) { \ 46 _value = h._value; \ 47 if (_value != NULL) { \ 48 assert(_value->is_valid(), "obj is valid"); \ 49 if (h._thread != NULL) { \ 50 assert(h._thread == Thread::current(), "thread must be current");\ 51 _thread = h._thread; \ 52 } else { \ 53 _thread = Thread::current(); \ 54 } \ 55 assert (_thread->is_in_stack((address)this), "not on stack?"); \ 56 _thread->metadata_handles()->push((Metadata*)_value); \ 57 } else { \ 58 _thread = NULL; \ 59 } \ 60 } \ 61 name##Handle& name##Handle::operator=(const name##Handle &s) { \ 62 remove(); \ 63 _value = s._value; \ 64 if (_value != NULL) { \ 65 assert(_value->is_valid(), "obj is valid"); \ 66 if (s._thread != NULL) { \ 67 assert(s._thread == Thread::current(), "thread must be current");\ 68 _thread = s._thread; \ 69 } else { \ 70 _thread = Thread::current(); \ 71 } \ 72 assert (_thread->is_in_stack((address)this), "not on stack?"); \ 73 _thread->metadata_handles()->push((Metadata*)_value); \ 74 } else { \ 75 _thread = NULL; \ 76 } \ 77 return *this; \ 78 } \ 79 inline void name##Handle::remove() { \ 80 if (_value != NULL) { \ 81 int i = _thread->metadata_handles()->find_from_end((Metadata*)_value); \ 82 assert(i!=-1, "not in metadata_handles list"); \ 83 _thread->metadata_handles()->remove_at(i); \ 84 } \ 85 } \ 86 name##Handle::~name##Handle () { remove(); } \ 87 88 DEF_METADATA_HANDLE_FN_NOINLINE(method, Method) 89 DEF_METADATA_HANDLE_FN_NOINLINE(constantPool, ConstantPool) 90 91 92 static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) { 93 oop* bottom = (oop*) chunk->bottom(); 94 oop* top = (oop*) chunk_top; 95 uintx handles_visited = top - bottom; 96 assert(top >= bottom && top <= (oop*) chunk->top(), "just checking"); 97 // during GC phase 3, a handle may be a forward pointer that 98 // is not yet valid, so loosen the assertion 99 while (bottom < top) { 100 // This test can be moved up but for now check every oop. 101 102 assert(oopDesc::is_oop(*bottom), "handle should point to oop"); 103 if (Universe::heap()->is_in_reserved_or_null(*bottom)) { 104 f->do_oop(bottom); 105 } 106 bottom++; 107 } 108 return handles_visited; 109 } 110 111 // Used for debugging handle allocation. 112 NOT_PRODUCT(jint _nof_handlemarks = 0;) 113 114 void HandleArea::oops_do(OopClosure* f) { 115 uintx handles_visited = 0; 116 // First handle the current chunk. It is filled to the high water mark. 117 handles_visited += chunk_oops_do(f, _chunk, _hwm); 118 // Then handle all previous chunks. They are completely filled. 119 Chunk* k = _first; 120 while(k != _chunk) { 121 handles_visited += chunk_oops_do(f, k, k->top()); 122 k = k->next(); 123 } 124 125 if (_prev != NULL) _prev->oops_do(f); 126 } 127 128 void HandleMark::initialize(Thread* thread) { 129 _thread = thread; 130 // Save area 131 _area = thread->handle_area(); 132 // Save current top 133 _chunk = _area->_chunk; 134 _hwm = _area->_hwm; 135 _max = _area->_max; 136 _size_in_bytes = _area->_size_in_bytes; 137 debug_only(_area->_handle_mark_nesting++); 138 assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks"); 139 debug_only(Atomic::inc(&_nof_handlemarks);) 140 141 // Link this in the thread 142 set_previous_handle_mark(thread->last_handle_mark()); 143 thread->set_last_handle_mark(this); 144 } 145 146 147 HandleMark::~HandleMark() { 148 HandleArea* area = _area; // help compilers with poor alias analysis 149 assert(area == _thread->handle_area(), "sanity check"); 150 assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" ); 151 debug_only(area->_handle_mark_nesting--); 152 153 // Delete later chunks 154 if( _chunk->next() ) { 155 // reset arena size before delete chunks. Otherwise, the total 156 // arena size could exceed total chunk size 157 assert(area->size_in_bytes() > size_in_bytes(), "Sanity check"); 158 area->set_size_in_bytes(size_in_bytes()); 159 _chunk->next_chop(); 160 } else { 161 assert(area->size_in_bytes() == size_in_bytes(), "Sanity check"); 162 } 163 // Roll back arena to saved top markers 164 area->_chunk = _chunk; 165 area->_hwm = _hwm; 166 area->_max = _max; 167 #ifdef ASSERT 168 // clear out first chunk (to detect allocation bugs) 169 if (ZapVMHandleArea) { 170 memset(_hwm, badHandleValue, _max - _hwm); 171 } 172 Atomic::dec(&_nof_handlemarks); 173 #endif 174 175 // Unlink this from the thread 176 _thread->set_last_handle_mark(previous_handle_mark()); 177 } 178 179 void* HandleMark::operator new(size_t size) throw() { 180 return AllocateHeap(size, mtThread); 181 } 182 183 void* HandleMark::operator new [] (size_t size) throw() { 184 return AllocateHeap(size, mtThread); 185 } 186 187 void HandleMark::operator delete(void* p) { 188 FreeHeap(p); 189 } 190 191 void HandleMark::operator delete[](void* p) { 192 FreeHeap(p); 193 } 194 195 #ifdef ASSERT 196 197 NoHandleMark::NoHandleMark() { 198 HandleArea* area = Thread::current()->handle_area(); 199 area->_no_handle_mark_nesting++; 200 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); 201 } 202 203 204 NoHandleMark::~NoHandleMark() { 205 HandleArea* area = Thread::current()->handle_area(); 206 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); 207 area->_no_handle_mark_nesting--; 208 } 209 210 211 ResetNoHandleMark::ResetNoHandleMark() { 212 HandleArea* area = Thread::current()->handle_area(); 213 _no_handle_mark_nesting = area->_no_handle_mark_nesting; 214 area->_no_handle_mark_nesting = 0; 215 } 216 217 218 ResetNoHandleMark::~ResetNoHandleMark() { 219 HandleArea* area = Thread::current()->handle_area(); 220 area->_no_handle_mark_nesting = _no_handle_mark_nesting; 221 } 222 223 #endif