1 /* 2 * Copyright (c) 1997, 2018, 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 "oops/valueKlass.hpp" 30 #include "runtime/atomic.hpp" 31 #include "runtime/handles.inline.hpp" 32 #include "runtime/thread.inline.hpp" 33 34 #ifdef ASSERT 35 oop* HandleArea::allocate_handle(oop obj) { 36 assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark"); 37 assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark"); 38 assert(oopDesc::is_oop(obj), "not an oop: " INTPTR_FORMAT, p2i(obj)); 39 return real_allocate_handle(obj); 40 } 41 #endif 42 43 // Copy constructors and destructors for metadata handles 44 // These do too much to inline. 45 #define DEF_METADATA_HANDLE_FN_NOINLINE(name, type) \ 46 name##Handle::name##Handle(const name##Handle &h) { \ 47 _value = h._value; \ 48 if (_value != NULL) { \ 49 assert(_value->is_valid(), "obj is valid"); \ 50 if (h._thread != NULL) { \ 51 assert(h._thread == Thread::current(), "thread must be current");\ 52 _thread = h._thread; \ 53 } else { \ 54 _thread = Thread::current(); \ 55 } \ 56 assert (_thread->is_in_stack((address)this), "not on stack?"); \ 57 _thread->metadata_handles()->push((Metadata*)_value); \ 58 } else { \ 59 _thread = NULL; \ 60 } \ 61 } \ 62 name##Handle& name##Handle::operator=(const name##Handle &s) { \ 63 remove(); \ 64 _value = s._value; \ 65 if (_value != NULL) { \ 66 assert(_value->is_valid(), "obj is valid"); \ 67 if (s._thread != NULL) { \ 68 assert(s._thread == Thread::current(), "thread must be current");\ 69 _thread = s._thread; \ 70 } else { \ 71 _thread = Thread::current(); \ 72 } \ 73 assert (_thread->is_in_stack((address)this), "not on stack?"); \ 74 _thread->metadata_handles()->push((Metadata*)_value); \ 75 } else { \ 76 _thread = NULL; \ 77 } \ 78 return *this; \ 79 } \ 80 inline void name##Handle::remove() { \ 81 if (_value != NULL) { \ 82 int i = _thread->metadata_handles()->find_from_end((Metadata*)_value); \ 83 assert(i!=-1, "not in metadata_handles list"); \ 84 _thread->metadata_handles()->remove_at(i); \ 85 } \ 86 } \ 87 name##Handle::~name##Handle () { remove(); } \ 88 89 DEF_METADATA_HANDLE_FN_NOINLINE(method, Method) 90 DEF_METADATA_HANDLE_FN_NOINLINE(constantPool, ConstantPool) 91 92 93 static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) { 94 oop* bottom = (oop*) chunk->bottom(); 95 oop* top = (oop*) chunk_top; 96 uintx handles_visited = top - bottom; 97 assert(top >= bottom && top <= (oop*) chunk->top(), "just checking"); 98 // during GC phase 3, a handle may be a forward pointer that 99 // is not yet valid, so loosen the assertion 100 while (bottom < top) { 101 if (Universe::heap()->is_in_reserved_or_null(*bottom)) { 102 f->do_oop(bottom); 103 } 104 bottom++; 105 } 106 return handles_visited; 107 } 108 109 // Used for debugging handle allocation. 110 NOT_PRODUCT(jint _nof_handlemarks = 0;) 111 112 void HandleArea::oops_do(OopClosure* f) { 113 uintx handles_visited = 0; 114 // First handle the current chunk. It is filled to the high water mark. 115 handles_visited += chunk_oops_do(f, _chunk, _hwm); 116 // Then handle all previous chunks. They are completely filled. 117 Chunk* k = _first; 118 while(k != _chunk) { 119 handles_visited += chunk_oops_do(f, k, k->top()); 120 k = k->next(); 121 } 122 123 if (_prev != NULL) _prev->oops_do(f); 124 } 125 126 void HandleMark::initialize(Thread* thread) { 127 _thread = thread; 128 // Save area 129 _area = thread->handle_area(); 130 // Save current top 131 _chunk = _area->_chunk; 132 _hwm = _area->_hwm; 133 _max = _area->_max; 134 _size_in_bytes = _area->_size_in_bytes; 135 debug_only(_area->_handle_mark_nesting++); 136 assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks"); 137 debug_only(Atomic::inc(&_nof_handlemarks);) 138 139 // Link this in the thread 140 set_previous_handle_mark(thread->last_handle_mark()); 141 thread->set_last_handle_mark(this); 142 } 143 144 145 HandleMark::~HandleMark() { 146 HandleArea* area = _area; // help compilers with poor alias analysis 147 assert(area == _thread->handle_area(), "sanity check"); 148 assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" ); 149 debug_only(area->_handle_mark_nesting--); 150 151 // Delete later chunks 152 if( _chunk->next() ) { 153 // reset arena size before delete chunks. Otherwise, the total 154 // arena size could exceed total chunk size 155 assert(area->size_in_bytes() > size_in_bytes(), "Sanity check"); 156 area->set_size_in_bytes(size_in_bytes()); 157 _chunk->next_chop(); 158 } else { 159 assert(area->size_in_bytes() == size_in_bytes(), "Sanity check"); 160 } 161 // Roll back arena to saved top markers 162 area->_chunk = _chunk; 163 area->_hwm = _hwm; 164 area->_max = _max; 165 #ifdef ASSERT 166 // clear out first chunk (to detect allocation bugs) 167 if (ZapVMHandleArea) { 168 memset(_hwm, badHandleValue, _max - _hwm); 169 } 170 Atomic::dec(&_nof_handlemarks); 171 #endif 172 173 // Unlink this from the thread 174 _thread->set_last_handle_mark(previous_handle_mark()); 175 } 176 177 void* HandleMark::operator new(size_t size) throw() { 178 return AllocateHeap(size, mtThread); 179 } 180 181 void* HandleMark::operator new [] (size_t size) throw() { 182 return AllocateHeap(size, mtThread); 183 } 184 185 void HandleMark::operator delete(void* p) { 186 FreeHeap(p); 187 } 188 189 void HandleMark::operator delete[](void* p) { 190 FreeHeap(p); 191 } 192 193 #ifdef ASSERT 194 195 NoHandleMark::NoHandleMark() { 196 HandleArea* area = Thread::current()->handle_area(); 197 area->_no_handle_mark_nesting++; 198 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); 199 } 200 201 202 NoHandleMark::~NoHandleMark() { 203 HandleArea* area = Thread::current()->handle_area(); 204 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); 205 area->_no_handle_mark_nesting--; 206 } 207 208 209 ResetNoHandleMark::ResetNoHandleMark() { 210 HandleArea* area = Thread::current()->handle_area(); 211 _no_handle_mark_nesting = area->_no_handle_mark_nesting; 212 area->_no_handle_mark_nesting = 0; 213 } 214 215 216 ResetNoHandleMark::~ResetNoHandleMark() { 217 HandleArea* area = Thread::current()->handle_area(); 218 area->_no_handle_mark_nesting = _no_handle_mark_nesting; 219 } 220 221 #endif // ASSERT