1 /* 2 * Copyright (c) 1997, 2019, 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.hpp" 27 #include "memory/allocation.inline.hpp" 28 #include "memory/arena.hpp" 29 #include "memory/metaspaceShared.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "runtime/atomic.hpp" 32 #include "runtime/os.hpp" 33 #include "runtime/task.hpp" 34 #include "runtime/threadCritical.hpp" 35 #include "services/memTracker.hpp" 36 #include "utilities/ostream.hpp" 37 38 // allocate using malloc; will fail if no memory available 39 char* AllocateHeap(size_t size, 40 MEMFLAGS flags, 41 const NativeCallStack& stack, 42 AllocFailType alloc_failmode /* = AllocFailStrategy::EXIT_OOM*/) { 43 char* p = (char*) os::malloc(size, flags, stack); 44 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) { 45 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "AllocateHeap"); 46 } 47 return p; 48 } 49 50 char* AllocateHeap(size_t size, 51 MEMFLAGS flags, 52 AllocFailType alloc_failmode /* = AllocFailStrategy::EXIT_OOM*/) { 53 return AllocateHeap(size, flags, CALLER_PC); 54 } 55 56 char* ReallocateHeap(char *old, 57 size_t size, 58 MEMFLAGS flag, 59 AllocFailType alloc_failmode) { 60 char* p = (char*) os::realloc(old, size, flag, CALLER_PC); 61 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) { 62 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "ReallocateHeap"); 63 } 64 return p; 65 } 66 67 void FreeHeap(void* p) { 68 os::free(p); 69 } 70 71 void* MetaspaceObj::_shared_metaspace_base = NULL; 72 void* MetaspaceObj::_shared_metaspace_top = NULL; 73 74 void* StackObj::operator new(size_t size) throw() { ShouldNotCallThis(); return 0; } 75 void StackObj::operator delete(void* p) { ShouldNotCallThis(); } 76 void* StackObj::operator new [](size_t size) throw() { ShouldNotCallThis(); return 0; } 77 void StackObj::operator delete [](void* p) { ShouldNotCallThis(); } 78 79 void* MetaspaceObj::operator new(size_t size, ClassLoaderData* loader_data, 80 size_t word_size, 81 MetaspaceObj::Type type, TRAPS) throw() { 82 // Klass has it's own operator new 83 return Metaspace::allocate(loader_data, word_size, type, THREAD); 84 } 85 86 bool MetaspaceObj::is_valid(const MetaspaceObj* p) { 87 // Weed out obvious bogus values first without traversing metaspace 88 if ((size_t)p < os::min_page_size()) { 89 return false; 90 } else if (!is_aligned((address)p, sizeof(MetaWord))) { 91 return false; 92 } 93 return Metaspace::contains((void*)p); 94 } 95 96 void MetaspaceObj::print_address_on(outputStream* st) const { 97 st->print(" {" INTPTR_FORMAT "}", p2i(this)); 98 } 99 100 void* ResourceObj::operator new(size_t size, Arena *arena) throw() { 101 address res = (address)arena->Amalloc(size); 102 DEBUG_ONLY(set_allocation_type(res, ARENA);) 103 return res; 104 } 105 106 void* ResourceObj::operator new [](size_t size, Arena *arena) throw() { 107 address res = (address)arena->Amalloc(size); 108 DEBUG_ONLY(set_allocation_type(res, ARENA);) 109 return res; 110 } 111 112 void* ResourceObj::operator new(size_t size, allocation_type type, MEMFLAGS flags) throw() { 113 address res = NULL; 114 switch (type) { 115 case C_HEAP: 116 res = (address)AllocateHeap(size, flags, CALLER_PC); 117 DEBUG_ONLY(set_allocation_type(res, C_HEAP);) 118 break; 119 case RESOURCE_AREA: 120 // new(size) sets allocation type RESOURCE_AREA. 121 res = (address)operator new(size); 122 break; 123 default: 124 ShouldNotReachHere(); 125 } 126 return res; 127 } 128 129 void* ResourceObj::operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw() { 130 return (address) operator new(size, type, flags); 131 } 132 133 void* ResourceObj::operator new(size_t size, const std::nothrow_t& nothrow_constant, 134 allocation_type type, MEMFLAGS flags) throw() { 135 // should only call this with std::nothrow, use other operator new() otherwise 136 address res = NULL; 137 switch (type) { 138 case C_HEAP: 139 res = (address)AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL); 140 DEBUG_ONLY(if (res!= NULL) set_allocation_type(res, C_HEAP);) 141 break; 142 case RESOURCE_AREA: 143 // new(size) sets allocation type RESOURCE_AREA. 144 res = (address)operator new(size, std::nothrow); 145 break; 146 default: 147 ShouldNotReachHere(); 148 } 149 return res; 150 } 151 152 void* ResourceObj::operator new [](size_t size, const std::nothrow_t& nothrow_constant, 153 allocation_type type, MEMFLAGS flags) throw() { 154 return (address)operator new(size, nothrow_constant, type, flags); 155 } 156 157 void ResourceObj::operator delete(void* p) { 158 assert(((ResourceObj *)p)->allocated_on_C_heap(), 159 "delete only allowed for C_HEAP objects"); 160 DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;) 161 FreeHeap(p); 162 } 163 164 void ResourceObj::operator delete [](void* p) { 165 operator delete(p); 166 } 167 168 #ifdef ASSERT 169 void ResourceObj::set_allocation_type(address res, allocation_type type) { 170 // Set allocation type in the resource object 171 uintptr_t allocation = (uintptr_t)res; 172 assert((allocation & allocation_mask) == 0, "address should be aligned to 4 bytes at least: " INTPTR_FORMAT, p2i(res)); 173 assert(type <= allocation_mask, "incorrect allocation type"); 174 ResourceObj* resobj = (ResourceObj *)res; 175 resobj->_allocation_t[0] = ~(allocation + type); 176 if (type != STACK_OR_EMBEDDED) { 177 // Called from operator new(), set verification value. 178 resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type; 179 } 180 } 181 182 ResourceObj::allocation_type ResourceObj::get_allocation_type() const { 183 assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object"); 184 return (allocation_type)((~_allocation_t[0]) & allocation_mask); 185 } 186 187 bool ResourceObj::is_type_set() const { 188 allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask); 189 return get_allocation_type() == type && 190 (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]); 191 } 192 193 // This whole business of passing information from ResourceObj::operator new 194 // to the ResourceObj constructor via fields in the "object" is technically UB. 195 // But it seems to work within the limitations of HotSpot usage (such as no 196 // multiple inheritance) with the compilers and compiler options we're using. 197 // And it gives some possibly useful checking for misuse of ResourceObj. 198 void ResourceObj::initialize_allocation_info() { 199 if (~(_allocation_t[0] | allocation_mask) != (uintptr_t)this) { 200 // Operator new() is not called for allocations 201 // on stack and for embedded objects. 202 set_allocation_type((address)this, STACK_OR_EMBEDDED); 203 } else if (allocated_on_stack()) { // STACK_OR_EMBEDDED 204 // For some reason we got a value which resembles 205 // an embedded or stack object (operator new() does not 206 // set such type). Keep it since it is valid value 207 // (even if it was garbage). 208 // Ignore garbage in other fields. 209 } else if (is_type_set()) { 210 // Operator new() was called and type was set. 211 assert(!allocated_on_stack(), 212 "not embedded or stack, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")", 213 p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]); 214 } else { 215 // Operator new() was not called. 216 // Assume that it is embedded or stack object. 217 set_allocation_type((address)this, STACK_OR_EMBEDDED); 218 } 219 _allocation_t[1] = 0; // Zap verification value 220 } 221 222 ResourceObj::ResourceObj() { 223 initialize_allocation_info(); 224 } 225 226 ResourceObj::ResourceObj(const ResourceObj&) { 227 // Initialize _allocation_t as a new object, ignoring object being copied. 228 initialize_allocation_info(); 229 } 230 231 ResourceObj& ResourceObj::operator=(const ResourceObj& r) { 232 assert(allocated_on_stack(), 233 "copy only into local, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")", 234 p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]); 235 // Keep current _allocation_t value; 236 return *this; 237 } 238 239 ResourceObj::~ResourceObj() { 240 // allocated_on_C_heap() also checks that encoded (in _allocation) address == this. 241 if (!allocated_on_C_heap()) { // ResourceObj::delete() will zap _allocation for C_heap. 242 _allocation_t[0] = (uintptr_t)badHeapOopVal; // zap type 243 } 244 } 245 #endif // ASSERT 246 247 //-------------------------------------------------------------------------------------- 248 // Non-product code 249 250 #ifndef PRODUCT 251 void AllocatedObj::print() const { print_on(tty); } 252 void AllocatedObj::print_value() const { print_value_on(tty); } 253 254 void AllocatedObj::print_on(outputStream* st) const { 255 st->print_cr("AllocatedObj(" INTPTR_FORMAT ")", p2i(this)); 256 } 257 258 void AllocatedObj::print_value_on(outputStream* st) const { 259 st->print("AllocatedObj(" INTPTR_FORMAT ")", p2i(this)); 260 } 261 262 ReallocMark::ReallocMark() { 263 #ifdef ASSERT 264 Thread *thread = Thread::current(); 265 _nesting = thread->resource_area()->nesting(); 266 #endif 267 } 268 269 void ReallocMark::check() { 270 #ifdef ASSERT 271 if (_nesting != Thread::current()->resource_area()->nesting()) { 272 fatal("allocation bug: array could grow within nested ResourceMark"); 273 } 274 #endif 275 } 276 277 #endif // Non-product