Mercurial > hg > truffle
annotate src/share/vm/code/codeBlob.hpp @ 1135:e66fd840cb6b
6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
Summary: During the work for 6829187 we have fixed a number of basic bugs which are logically grouped with 6815692 and 6858164 but which must be reviewed and pushed separately.
Reviewed-by: kvn, never
| author | twisti |
|---|---|
| date | Mon, 04 Jan 2010 18:38:08 +0100 |
| parents | 148e5441d916 |
| children | 4e6abf09f540 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
1135
e66fd840cb6b
6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
twisti
parents:
989
diff
changeset
|
2 * Copyright 1998-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // CodeBlob - superclass for all entries in the CodeCache. | |
| 26 // | |
| 27 // Suptypes are: | |
| 28 // nmethod : Compiled Java methods (include method that calls to native code) | |
| 29 // RuntimeStub : Call to VM runtime methods | |
| 30 // DeoptimizationBlob : Used for deoptimizatation | |
| 31 // ExceptionBlob : Used for stack unrolling | |
| 32 // SafepointBlob : Used to handle illegal instruction exceptions | |
| 33 // | |
| 34 // | |
| 35 // Layout: | |
| 36 // - header | |
| 37 // - relocation | |
| 38 // - instruction space | |
| 39 // - data space | |
| 40 class DeoptimizationBlob; | |
| 41 | |
| 42 class CodeBlob VALUE_OBJ_CLASS_SPEC { | |
| 43 | |
| 44 friend class VMStructs; | |
| 45 | |
| 46 private: | |
| 47 const char* _name; | |
| 48 int _size; // total size of CodeBlob in bytes | |
| 49 int _header_size; // size of header (depends on subclass) | |
| 50 int _relocation_size; // size of relocation | |
| 51 int _instructions_offset; // offset to where instructions region begins | |
| 52 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have | |
| 53 // not finished setting up their frame. Beware of pc's in | |
| 54 // that range. There is a similar range(s) on returns | |
| 55 // which we don't detect. | |
| 56 int _data_offset; // offset to where data region begins | |
| 57 int _oops_offset; // offset to where embedded oop table begins (inside data) | |
| 58 int _oops_length; // number of embedded oops | |
| 59 int _frame_size; // size of stack frame | |
| 60 OopMapSet* _oop_maps; // OopMap for this CodeBlob | |
| 61 CodeComments _comments; | |
| 62 | |
| 63 friend class OopRecorder; | |
| 64 | |
| 65 void fix_oop_relocations(address begin, address end, bool initialize_immediates); | |
| 66 inline void initialize_immediate_oop(oop* dest, jobject handle); | |
| 67 | |
| 68 public: | |
| 69 // Returns the space needed for CodeBlob | |
| 70 static unsigned int allocation_size(CodeBuffer* cb, int header_size); | |
| 71 | |
| 72 // Creation | |
| 73 // a) simple CodeBlob | |
| 74 // frame_complete is the offset from the beginning of the instructions | |
| 75 // to where the frame setup (from stackwalk viewpoint) is complete. | |
| 76 CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size); | |
| 77 | |
| 78 // b) full CodeBlob | |
| 79 CodeBlob( | |
| 80 const char* name, | |
| 81 CodeBuffer* cb, | |
| 82 int header_size, | |
| 83 int size, | |
| 84 int frame_complete, | |
| 85 int frame_size, | |
| 86 OopMapSet* oop_maps | |
| 87 ); | |
| 88 | |
| 89 // Deletion | |
| 90 void flush(); | |
| 91 | |
| 92 // Typing | |
| 93 virtual bool is_buffer_blob() const { return false; } | |
| 94 virtual bool is_nmethod() const { return false; } | |
| 95 virtual bool is_runtime_stub() const { return false; } | |
| 96 virtual bool is_deoptimization_stub() const { return false; } | |
| 97 virtual bool is_uncommon_trap_stub() const { return false; } | |
| 98 virtual bool is_exception_stub() const { return false; } | |
| 99 virtual bool is_safepoint_stub() const { return false; } | |
| 100 virtual bool is_adapter_blob() const { return false; } | |
| 101 | |
| 102 virtual bool is_compiled_by_c2() const { return false; } | |
| 103 virtual bool is_compiled_by_c1() const { return false; } | |
| 104 | |
|
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6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
twisti
parents:
989
diff
changeset
|
105 // Casting |
|
e66fd840cb6b
6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
twisti
parents:
989
diff
changeset
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106 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; } |
|
e66fd840cb6b
6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
twisti
parents:
989
diff
changeset
|
107 |
| 0 | 108 // Boundaries |
| 109 address header_begin() const { return (address) this; } | |
| 110 address header_end() const { return ((address) this) + _header_size; }; | |
| 111 relocInfo* relocation_begin() const { return (relocInfo*) header_end(); }; | |
| 112 relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); } | |
| 113 address instructions_begin() const { return (address) header_begin() + _instructions_offset; } | |
| 114 address instructions_end() const { return (address) header_begin() + _data_offset; } | |
| 115 address data_begin() const { return (address) header_begin() + _data_offset; } | |
| 116 address data_end() const { return (address) header_begin() + _size; } | |
| 117 oop* oops_begin() const { return (oop*) (header_begin() + _oops_offset); } | |
| 118 oop* oops_end() const { return oops_begin() + _oops_length; } | |
| 119 | |
| 120 // Offsets | |
| 121 int relocation_offset() const { return _header_size; } | |
| 122 int instructions_offset() const { return _instructions_offset; } | |
| 123 int data_offset() const { return _data_offset; } | |
| 124 int oops_offset() const { return _oops_offset; } | |
| 125 | |
| 126 // Sizes | |
| 127 int size() const { return _size; } | |
| 128 int header_size() const { return _header_size; } | |
| 129 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); } | |
| 130 int instructions_size() const { return instructions_end() - instructions_begin(); } | |
| 131 int data_size() const { return data_end() - data_begin(); } | |
| 132 int oops_size() const { return (address) oops_end() - (address) oops_begin(); } | |
| 133 | |
| 134 // Containment | |
| 135 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); } | |
| 136 bool relocation_contains(relocInfo* addr) const{ return relocation_begin() <= addr && addr < relocation_end(); } | |
| 137 bool instructions_contains(address addr) const { return instructions_begin() <= addr && addr < instructions_end(); } | |
| 138 bool data_contains(address addr) const { return data_begin() <= addr && addr < data_end(); } | |
| 139 bool oops_contains(oop* addr) const { return oops_begin() <= addr && addr < oops_end(); } | |
| 140 bool contains(address addr) const { return instructions_contains(addr); } | |
| 141 bool is_frame_complete_at(address addr) const { return instructions_contains(addr) && | |
| 142 addr >= instructions_begin() + _frame_complete_offset; } | |
| 143 | |
| 144 // Relocation support | |
| 145 void fix_oop_relocations(address begin, address end) { | |
| 146 fix_oop_relocations(begin, end, false); | |
| 147 } | |
| 148 void fix_oop_relocations() { | |
| 149 fix_oop_relocations(NULL, NULL, false); | |
| 150 } | |
| 151 relocInfo::relocType reloc_type_for_address(address pc); | |
| 152 bool is_at_poll_return(address pc); | |
| 153 bool is_at_poll_or_poll_return(address pc); | |
| 154 | |
| 155 // Support for oops in scopes and relocs: | |
| 156 // Note: index 0 is reserved for null. | |
| 157 oop oop_at(int index) const { return index == 0? (oop)NULL: *oop_addr_at(index); } | |
| 158 oop* oop_addr_at(int index) const{ // for GC | |
| 159 // relocation indexes are biased by 1 (because 0 is reserved) | |
| 160 assert(index > 0 && index <= _oops_length, "must be a valid non-zero index"); | |
| 161 return &oops_begin()[index-1]; | |
| 162 } | |
| 163 | |
| 164 void copy_oops(GrowableArray<jobject>* oops); | |
| 165 | |
| 166 // CodeCache support: really only used by the nmethods, but in order to get | |
| 167 // asserts and certain bookkeeping to work in the CodeCache they are defined | |
| 168 // virtual here. | |
| 169 virtual bool is_zombie() const { return false; } | |
| 170 virtual bool is_locked_by_vm() const { return false; } | |
| 171 | |
| 172 virtual bool is_unloaded() const { return false; } | |
| 173 virtual bool is_not_entrant() const { return false; } | |
| 174 | |
| 175 // GC support | |
| 176 virtual bool is_alive() const = 0; | |
| 177 virtual void do_unloading(BoolObjectClosure* is_alive, | |
| 178 OopClosure* keep_alive, | |
| 179 bool unloading_occurred); | |
| 180 virtual void oops_do(OopClosure* f) = 0; | |
| 989 | 181 // (All CodeBlob subtypes other than NMethod currently have |
| 182 // an empty oops_do() method. | |
| 0 | 183 |
| 184 // OopMap for frame | |
| 185 OopMapSet* oop_maps() const { return _oop_maps; } | |
| 186 void set_oop_maps(OopMapSet* p); | |
| 187 OopMap* oop_map_for_return_address(address return_address); | |
| 188 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); } | |
| 189 | |
| 190 // Frame support | |
| 191 int frame_size() const { return _frame_size; } | |
| 192 void set_frame_size(int size) { _frame_size = size; } | |
| 193 | |
| 194 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments | |
| 195 virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; } | |
| 196 | |
| 197 // Naming | |
| 198 const char* name() const { return _name; } | |
| 199 void set_name(const char* name) { _name = name; } | |
| 200 | |
| 201 // Debugging | |
| 202 virtual void verify(); | |
| 203 virtual void print() const PRODUCT_RETURN; | |
| 204 virtual void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 205 | |
| 206 // Print the comment associated with offset on stream, if there is one | |
| 207 void print_block_comment(outputStream* stream, intptr_t offset) { | |
| 208 _comments.print_block_comment(stream, offset); | |
| 209 } | |
| 210 | |
| 211 // Transfer ownership of comments to this CodeBlob | |
| 212 void set_comments(CodeComments& comments) { | |
| 213 _comments.assign(comments); | |
| 214 } | |
| 215 }; | |
| 216 | |
| 217 | |
| 218 //---------------------------------------------------------------------------------------------------- | |
| 219 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc. | |
| 220 | |
| 221 class BufferBlob: public CodeBlob { | |
| 222 friend class VMStructs; | |
| 223 private: | |
| 224 // Creation support | |
| 225 BufferBlob(const char* name, int size); | |
| 226 BufferBlob(const char* name, int size, CodeBuffer* cb); | |
| 227 | |
| 228 void* operator new(size_t s, unsigned size); | |
| 229 | |
| 230 public: | |
| 231 // Creation | |
| 232 static BufferBlob* create(const char* name, int buffer_size); | |
| 233 static BufferBlob* create(const char* name, CodeBuffer* cb); | |
| 234 | |
| 235 static void free(BufferBlob* buf); | |
| 236 | |
| 237 // Typing | |
| 238 bool is_buffer_blob() const { return true; } | |
| 239 bool is_adapter_blob() const; | |
| 240 | |
| 241 // GC/Verification support | |
| 242 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } | |
| 243 bool is_alive() const { return true; } | |
| 244 void do_unloading(BoolObjectClosure* is_alive, | |
| 245 OopClosure* keep_alive, | |
| 246 bool unloading_occurred) { /* do nothing */ } | |
| 247 | |
| 248 void oops_do(OopClosure* f) { /* do nothing*/ } | |
| 249 | |
| 250 void verify(); | |
| 251 void print() const PRODUCT_RETURN; | |
| 252 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 253 }; | |
| 254 | |
| 255 | |
| 256 //---------------------------------------------------------------------------------------------------- | |
| 257 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine | |
| 258 | |
| 259 class RuntimeStub: public CodeBlob { | |
| 260 friend class VMStructs; | |
| 261 private: | |
| 262 bool _caller_must_gc_arguments; | |
| 263 | |
| 264 // Creation support | |
| 265 RuntimeStub( | |
| 266 const char* name, | |
| 267 CodeBuffer* cb, | |
| 268 int size, | |
| 269 int frame_complete, | |
| 270 int frame_size, | |
| 271 OopMapSet* oop_maps, | |
| 272 bool caller_must_gc_arguments | |
| 273 ); | |
| 274 | |
| 275 void* operator new(size_t s, unsigned size); | |
| 276 | |
| 277 public: | |
| 278 // Creation | |
| 279 static RuntimeStub* new_runtime_stub( | |
| 280 const char* stub_name, | |
| 281 CodeBuffer* cb, | |
| 282 int frame_complete, | |
| 283 int frame_size, | |
| 284 OopMapSet* oop_maps, | |
| 285 bool caller_must_gc_arguments | |
| 286 ); | |
| 287 | |
| 288 // Typing | |
| 289 bool is_runtime_stub() const { return true; } | |
| 290 | |
| 291 // GC support | |
| 292 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; } | |
| 293 | |
| 294 address entry_point() { return instructions_begin(); } | |
| 295 | |
| 296 // GC/Verification support | |
| 297 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } | |
| 298 bool is_alive() const { return true; } | |
| 299 void do_unloading(BoolObjectClosure* is_alive, | |
| 300 OopClosure* keep_alive, | |
| 301 bool unloading_occurred) { /* do nothing */ } | |
| 302 void oops_do(OopClosure* f) { /* do-nothing*/ } | |
| 303 | |
| 304 void verify(); | |
| 305 void print() const PRODUCT_RETURN; | |
| 306 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 307 }; | |
| 308 | |
| 309 | |
| 310 //---------------------------------------------------------------------------------------------------- | |
| 311 // Super-class for all blobs that exist in only one instance. Implements default behaviour. | |
| 312 | |
| 313 class SingletonBlob: public CodeBlob { | |
| 314 friend class VMStructs; | |
| 315 public: | |
| 316 SingletonBlob( | |
| 317 const char* name, | |
| 318 CodeBuffer* cb, | |
| 319 int header_size, | |
| 320 int size, | |
| 321 int frame_size, | |
| 322 OopMapSet* oop_maps | |
| 323 ) | |
| 324 : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps) | |
| 325 {}; | |
| 326 | |
| 327 bool is_alive() const { return true; } | |
| 328 void do_unloading(BoolObjectClosure* is_alive, | |
| 329 OopClosure* keep_alive, | |
| 330 bool unloading_occurred) { /* do-nothing*/ } | |
| 331 | |
| 332 void verify(); // does nothing | |
| 333 void print() const PRODUCT_RETURN; | |
| 334 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 335 }; | |
| 336 | |
| 337 | |
| 338 //---------------------------------------------------------------------------------------------------- | |
| 339 // DeoptimizationBlob | |
| 340 | |
| 341 class DeoptimizationBlob: public SingletonBlob { | |
| 342 friend class VMStructs; | |
| 343 private: | |
| 344 int _unpack_offset; | |
| 345 int _unpack_with_exception; | |
| 346 int _unpack_with_reexecution; | |
| 347 | |
| 348 int _unpack_with_exception_in_tls; | |
| 349 | |
| 350 // Creation support | |
| 351 DeoptimizationBlob( | |
| 352 CodeBuffer* cb, | |
| 353 int size, | |
| 354 OopMapSet* oop_maps, | |
| 355 int unpack_offset, | |
| 356 int unpack_with_exception_offset, | |
| 357 int unpack_with_reexecution_offset, | |
| 358 int frame_size | |
| 359 ); | |
| 360 | |
| 361 void* operator new(size_t s, unsigned size); | |
| 362 | |
| 363 public: | |
| 364 // Creation | |
| 365 static DeoptimizationBlob* create( | |
| 366 CodeBuffer* cb, | |
| 367 OopMapSet* oop_maps, | |
| 368 int unpack_offset, | |
| 369 int unpack_with_exception_offset, | |
| 370 int unpack_with_reexecution_offset, | |
| 371 int frame_size | |
| 372 ); | |
| 373 | |
| 374 // Typing | |
| 375 bool is_deoptimization_stub() const { return true; } | |
| 376 const DeoptimizationBlob *as_deoptimization_stub() const { return this; } | |
| 377 bool exception_address_is_unpack_entry(address pc) const { | |
| 378 address unpack_pc = unpack(); | |
| 379 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc); | |
| 380 } | |
| 381 | |
| 382 | |
| 383 | |
| 384 | |
| 385 // GC for args | |
| 386 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ } | |
| 387 | |
| 388 // Iteration | |
| 389 void oops_do(OopClosure* f) {} | |
| 390 | |
| 391 // Printing | |
| 392 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 393 | |
| 394 address unpack() const { return instructions_begin() + _unpack_offset; } | |
| 395 address unpack_with_exception() const { return instructions_begin() + _unpack_with_exception; } | |
| 396 address unpack_with_reexecution() const { return instructions_begin() + _unpack_with_reexecution; } | |
| 397 | |
| 398 // Alternate entry point for C1 where the exception and issuing pc | |
| 399 // are in JavaThread::_exception_oop and JavaThread::_exception_pc | |
| 400 // instead of being in registers. This is needed because C1 doesn't | |
| 401 // model exception paths in a way that keeps these registers free so | |
| 402 // there may be live values in those registers during deopt. | |
| 403 void set_unpack_with_exception_in_tls_offset(int offset) { | |
| 404 _unpack_with_exception_in_tls = offset; | |
| 405 assert(contains(instructions_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob"); | |
| 406 } | |
| 407 address unpack_with_exception_in_tls() const { return instructions_begin() + _unpack_with_exception_in_tls; } | |
| 408 }; | |
| 409 | |
| 410 | |
| 411 //---------------------------------------------------------------------------------------------------- | |
| 412 // UncommonTrapBlob (currently only used by Compiler 2) | |
| 413 | |
| 414 #ifdef COMPILER2 | |
| 415 | |
| 416 class UncommonTrapBlob: public SingletonBlob { | |
| 417 friend class VMStructs; | |
| 418 private: | |
| 419 // Creation support | |
| 420 UncommonTrapBlob( | |
| 421 CodeBuffer* cb, | |
| 422 int size, | |
| 423 OopMapSet* oop_maps, | |
| 424 int frame_size | |
| 425 ); | |
| 426 | |
| 427 void* operator new(size_t s, unsigned size); | |
| 428 | |
| 429 public: | |
| 430 // Creation | |
| 431 static UncommonTrapBlob* create( | |
| 432 CodeBuffer* cb, | |
| 433 OopMapSet* oop_maps, | |
| 434 int frame_size | |
| 435 ); | |
| 436 | |
| 437 // GC for args | |
| 438 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } | |
| 439 | |
| 440 // Typing | |
| 441 bool is_uncommon_trap_stub() const { return true; } | |
| 442 | |
| 443 // Iteration | |
| 444 void oops_do(OopClosure* f) {} | |
| 445 }; | |
| 446 | |
| 447 | |
| 448 //---------------------------------------------------------------------------------------------------- | |
| 449 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2) | |
| 450 | |
| 451 class ExceptionBlob: public SingletonBlob { | |
| 452 friend class VMStructs; | |
| 453 private: | |
| 454 // Creation support | |
| 455 ExceptionBlob( | |
| 456 CodeBuffer* cb, | |
| 457 int size, | |
| 458 OopMapSet* oop_maps, | |
| 459 int frame_size | |
| 460 ); | |
| 461 | |
| 462 void* operator new(size_t s, unsigned size); | |
| 463 | |
| 464 public: | |
| 465 // Creation | |
| 466 static ExceptionBlob* create( | |
| 467 CodeBuffer* cb, | |
| 468 OopMapSet* oop_maps, | |
| 469 int frame_size | |
| 470 ); | |
| 471 | |
| 472 // GC for args | |
| 473 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } | |
| 474 | |
| 475 // Typing | |
| 476 bool is_exception_stub() const { return true; } | |
| 477 | |
| 478 // Iteration | |
| 479 void oops_do(OopClosure* f) {} | |
| 480 }; | |
| 481 #endif // COMPILER2 | |
| 482 | |
| 483 | |
| 484 //---------------------------------------------------------------------------------------------------- | |
| 485 // SafepointBlob: handles illegal_instruction exceptions during a safepoint | |
| 486 | |
| 487 class SafepointBlob: public SingletonBlob { | |
| 488 friend class VMStructs; | |
| 489 private: | |
| 490 // Creation support | |
| 491 SafepointBlob( | |
| 492 CodeBuffer* cb, | |
| 493 int size, | |
| 494 OopMapSet* oop_maps, | |
| 495 int frame_size | |
| 496 ); | |
| 497 | |
| 498 void* operator new(size_t s, unsigned size); | |
| 499 | |
| 500 public: | |
| 501 // Creation | |
| 502 static SafepointBlob* create( | |
| 503 CodeBuffer* cb, | |
| 504 OopMapSet* oop_maps, | |
| 505 int frame_size | |
| 506 ); | |
| 507 | |
| 508 // GC for args | |
| 509 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } | |
| 510 | |
| 511 // Typing | |
| 512 bool is_safepoint_stub() const { return true; } | |
| 513 | |
| 514 // Iteration | |
| 515 void oops_do(OopClosure* f) {} | |
| 516 }; |