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 "gc/shared/genCollectedHeap.hpp"
27 #include "memory/allocation.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/arena.hpp"
30 #include "memory/metaspaceShared.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "memory/universe.hpp"
33 #include "runtime/atomic.hpp"
34 #include "runtime/os.hpp"
35 #include "runtime/task.hpp"
36 #include "runtime/threadCritical.hpp"
37 #include "services/memTracker.hpp"
38 #include "utilities/ostream.hpp"
39
40 // allocate using malloc; will fail if no memory available
41 char* AllocateHeap(size_t size,
42 MEMFLAGS flags,
43 const NativeCallStack& stack,
44 AllocFailType alloc_failmode) {
45 char* p = (char*) os::malloc(size, flags, stack);
46 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
47 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "AllocateHeap");
48 }
49 return p;
50 }
51
52 char* AllocateHeap(size_t size,
53 MEMFLAGS flags) {
54 return AllocateHeap(size, flags, CALLER_PC);
55 }
56 char* AllocateHeap(size_t size,
57 MEMFLAGS flags,
58 const std::nothrow_t& nothrow_constant) {
59 return AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL);
60 }
61 char* AllocateHeap(size_t size,
62 MEMFLAGS flags,
63 const std::nothrow_t& nothrow_constant,
64 const NativeCallStack& stack) {
65 return AllocateHeap(size, flags, stack, AllocFailStrategy::RETURN_NULL);
66 }
67
68 char* ReallocateHeap(char *old,
69 size_t size,
70 MEMFLAGS flag,
71 AllocFailType alloc_failmode) {
72 char* p = (char*) os::realloc(old, size, flag, CALLER_PC);
73 if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
74 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "ReallocateHeap");
75 }
76 return p;
77 }
78
79 void FreeHeap(void* p) {
80 os::free(p);
81 }
82
83 void* MetaspaceObj::_shared_metaspace_base = NULL;
84 void* MetaspaceObj::_shared_metaspace_top = NULL;
85
86 void* StackObj::operator new(size_t size) throw() { ShouldNotCallThis(); return 0; }
87 void StackObj::operator delete(void* p) { ShouldNotCallThis(); }
88 void* StackObj::operator new [](size_t size) throw() { ShouldNotCallThis(); return 0; }
89 void StackObj::operator delete [](void* p) { ShouldNotCallThis(); }
90
91 void* MetaspaceObj::operator new(size_t size, ClassLoaderData* loader_data,
92 size_t word_size,
93 MetaspaceObj::Type type, TRAPS) throw() {
94 // Klass has it's own operator new
95 return Metaspace::allocate(loader_data, word_size, type, THREAD);
96 }
97
98 bool MetaspaceObj::is_metaspace_object() const {
99 return Metaspace::contains((void*)this);
100 }
101
102 void MetaspaceObj::print_address_on(outputStream* st) const {
103 st->print(" {" INTPTR_FORMAT "}", p2i(this));
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, Arena *arena) throw() {
113 address res = (address)arena->Amalloc(size);
114 DEBUG_ONLY(set_allocation_type(res, ARENA);)
115 return res;
116 }
117
118 void* ResourceObj::operator new(size_t size, allocation_type type, MEMFLAGS flags) throw() {
119 address res = NULL;
120 switch (type) {
121 case C_HEAP:
122 res = (address)AllocateHeap(size, flags, CALLER_PC);
123 DEBUG_ONLY(set_allocation_type(res, C_HEAP);)
124 break;
125 case RESOURCE_AREA:
126 // new(size) sets allocation type RESOURCE_AREA.
127 res = (address)operator new(size);
128 break;
129 default:
130 ShouldNotReachHere();
131 }
132 return res;
133 }
134
135 void* ResourceObj::operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw() {
136 return (address) operator new(size, type, flags);
137 }
138
139 void* ResourceObj::operator new(size_t size, const std::nothrow_t& nothrow_constant,
140 allocation_type type, MEMFLAGS flags) throw() {
141 // should only call this with std::nothrow, use other operator new() otherwise
142 address res = NULL;
143 switch (type) {
144 case C_HEAP:
145 res = (address)AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL);
146 DEBUG_ONLY(if (res!= NULL) set_allocation_type(res, C_HEAP);)
147 break;
148 case RESOURCE_AREA:
149 // new(size) sets allocation type RESOURCE_AREA.
150 res = (address)operator new(size, std::nothrow);
151 break;
152 default:
153 ShouldNotReachHere();
154 }
155 return res;
156 }
157
158 void* ResourceObj::operator new [](size_t size, const std::nothrow_t& nothrow_constant,
159 allocation_type type, MEMFLAGS flags) throw() {
160 return (address)operator new(size, nothrow_constant, type, flags);
161 }
162
163 void ResourceObj::operator delete(void* p) {
164 assert(((ResourceObj *)p)->allocated_on_C_heap(),
165 "delete only allowed for C_HEAP objects");
166 DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;)
167 FreeHeap(p);
168 }
169
170 void ResourceObj::operator delete [](void* p) {
171 operator delete(p);
172 }
173
174 #ifdef ASSERT
175 void ResourceObj::set_allocation_type(address res, allocation_type type) {
176 // Set allocation type in the resource object
177 uintptr_t allocation = (uintptr_t)res;
178 assert((allocation & allocation_mask) == 0, "address should be aligned to 4 bytes at least: " INTPTR_FORMAT, p2i(res));
179 assert(type <= allocation_mask, "incorrect allocation type");
180 ResourceObj* resobj = (ResourceObj *)res;
181 resobj->_allocation_t[0] = ~(allocation + type);
182 if (type != STACK_OR_EMBEDDED) {
183 // Called from operator new() and CollectionSetChooser(),
184 // set verification value.
185 resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type;
186 }
187 }
188
189 ResourceObj::allocation_type ResourceObj::get_allocation_type() const {
190 assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object");
191 return (allocation_type)((~_allocation_t[0]) & allocation_mask);
192 }
193
194 bool ResourceObj::is_type_set() const {
195 allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask);
196 return get_allocation_type() == type &&
197 (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]);
198 }
199
200 ResourceObj::ResourceObj() { // default constructor
201 if (~(_allocation_t[0] | allocation_mask) != (uintptr_t)this) {
202 // Operator new() is not called for allocations
203 // on stack and for embedded objects.
204 set_allocation_type((address)this, STACK_OR_EMBEDDED);
205 } else if (allocated_on_stack()) { // STACK_OR_EMBEDDED
206 // For some reason we got a value which resembles
207 // an embedded or stack object (operator new() does not
208 // set such type). Keep it since it is valid value
209 // (even if it was garbage).
210 // Ignore garbage in other fields.
211 } else if (is_type_set()) {
212 // Operator new() was called and type was set.
213 assert(!allocated_on_stack(),
214 "not embedded or stack, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
215 p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]);
216 } else {
217 // Operator new() was not called.
218 // Assume that it is embedded or stack object.
219 set_allocation_type((address)this, STACK_OR_EMBEDDED);
220 }
221 _allocation_t[1] = 0; // Zap verification value
222 }
223
224 ResourceObj::ResourceObj(const ResourceObj& r) { // default copy constructor
225 // Used in ClassFileParser::parse_constant_pool_entries() for ClassFileStream.
226 // Note: garbage may resembles valid value.
227 assert(~(_allocation_t[0] | allocation_mask) != (uintptr_t)this || !is_type_set(),
228 "embedded or stack only, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
229 p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]);
230 set_allocation_type((address)this, STACK_OR_EMBEDDED);
231 _allocation_t[1] = 0; // Zap verification value
232 }
233
234 ResourceObj& ResourceObj::operator=(const ResourceObj& r) { // default copy assignment
235 // Used in InlineTree::ok_to_inline() for WarmCallInfo.
236 assert(allocated_on_stack(),
237 "copy only into local, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
238 p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]);
239 // Keep current _allocation_t value;
240 return *this;
241 }
242
243 ResourceObj::~ResourceObj() {
244 // allocated_on_C_heap() also checks that encoded (in _allocation) address == this.
245 if (!allocated_on_C_heap()) { // ResourceObj::delete() will zap _allocation for C_heap.
246 _allocation_t[0] = (uintptr_t)badHeapOopVal; // zap type
247 }
248 }
249 #endif // ASSERT
250
251 //--------------------------------------------------------------------------------------
252 // Non-product code
253
254 #ifndef PRODUCT
255 void AllocatedObj::print() const { print_on(tty); }
256 void AllocatedObj::print_value() const { print_value_on(tty); }
257
258 void AllocatedObj::print_on(outputStream* st) const {
259 st->print_cr("AllocatedObj(" INTPTR_FORMAT ")", p2i(this));
260 }
261
262 void AllocatedObj::print_value_on(outputStream* st) const {
263 st->print("AllocatedObj(" INTPTR_FORMAT ")", p2i(this));
264 }
265
266 AllocStats::AllocStats() {
267 start_mallocs = os::num_mallocs;
268 start_frees = os::num_frees;
269 start_malloc_bytes = os::alloc_bytes;
270 start_mfree_bytes = os::free_bytes;
271 start_res_bytes = Arena::_bytes_allocated;
272 }
273
274 julong AllocStats::num_mallocs() { return os::num_mallocs - start_mallocs; }
275 julong AllocStats::alloc_bytes() { return os::alloc_bytes - start_malloc_bytes; }
276 julong AllocStats::num_frees() { return os::num_frees - start_frees; }
277 julong AllocStats::free_bytes() { return os::free_bytes - start_mfree_bytes; }
278 julong AllocStats::resource_bytes() { return Arena::_bytes_allocated - start_res_bytes; }
279 void AllocStats::print() {
280 tty->print_cr(UINT64_FORMAT " mallocs (" UINT64_FORMAT "MB), "
281 UINT64_FORMAT " frees (" UINT64_FORMAT "MB), " UINT64_FORMAT "MB resrc",
282 num_mallocs(), alloc_bytes()/M, num_frees(), free_bytes()/M, resource_bytes()/M);
283 }
284
285 ReallocMark::ReallocMark() {
286 #ifdef ASSERT
287 Thread *thread = Thread::current();
288 _nesting = thread->resource_area()->nesting();
289 #endif
290 }
291
292 void ReallocMark::check() {
293 #ifdef ASSERT
294 if (_nesting != Thread::current()->resource_area()->nesting()) {
295 fatal("allocation bug: array could grow within nested ResourceMark");
296 }
297 #endif
298 }
299
300 #endif // Non-product