1 /* 2 * Copyright (c) 1998, 2016, 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 #ifndef SHARE_VM_CODE_CODEBLOB_HPP 26 #define SHARE_VM_CODE_CODEBLOB_HPP 27 28 #include "asm/codeBuffer.hpp" 29 #include "compiler/compilerDefinitions.hpp" 30 #include "compiler/oopMap.hpp" 31 #include "runtime/frame.hpp" 32 #include "runtime/handles.hpp" 33 #include "utilities/macros.hpp" 34 35 // CodeBlob Types 36 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps 37 struct CodeBlobType { 38 enum { 39 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods) 40 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods 41 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs 42 All = 3, // All types (No code cache segmentation) 43 Pregenerated = 4, // Special blobs, managed by CodeCacheExtensions 44 NumTypes = 5 // Number of CodeBlobTypes 45 }; 46 }; 47 48 // CodeBlob - superclass for all entries in the CodeCache. 49 // 50 // Subtypes are: 51 // CompiledMethod : Compiled Java methods (include method that calls to native code) 52 // nmethod : JIT Compiled Java methods 53 // RuntimeBlob : Non-compiled method code; generated glue code 54 // RuntimeStub : Call to VM runtime methods 55 // DeoptimizationBlob : Used for deoptimization 56 // ExceptionBlob : Used for stack unrolling 57 // SafepointBlob : Used to handle illegal instruction exceptions 58 // 59 // 60 // Layout: 61 // - header 62 // - relocation 63 // - content space 64 // - instruction space 65 // - data space 66 67 68 class CodeBlobLayout; 69 70 class CodeBlob VALUE_OBJ_CLASS_SPEC { 71 friend class VMStructs; 72 friend class JVMCIVMStructs; 73 friend class CodeCacheDumper; 74 75 protected: 76 77 const CompilerType _type; // CompilerType 78 int _size; // total size of CodeBlob in bytes 79 int _header_size; // size of header (depends on subclass) 80 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have 81 // not finished setting up their frame. Beware of pc's in 82 // that range. There is a similar range(s) on returns 83 // which we don't detect. 84 int _data_offset; // offset to where data region begins 85 int _frame_size; // size of stack frame 86 87 address _code_begin; 88 address _code_end; 89 address _content_begin; // address to where content region begins (this includes consts, insts, stubs) 90 // address _content_end - not required, for all CodeBlobs _code_end == _content_end for now 91 address _data_end; 92 address _relocation_begin; 93 address _relocation_end; 94 95 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob 96 bool _caller_must_gc_arguments; 97 CodeStrings _strings; 98 const char* _name; 99 S390_ONLY(int _ctable_offset;) 100 101 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments); 102 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments); 103 public: 104 // Returns the space needed for CodeBlob 105 static unsigned int allocation_size(CodeBuffer* cb, int header_size); 106 static unsigned int align_code_offset(int offset); 107 108 // Deletion 109 virtual void flush(); 110 111 // Typing 112 virtual bool is_buffer_blob() const { return false; } 113 virtual bool is_nmethod() const { return false; } 114 virtual bool is_runtime_stub() const { return false; } 115 virtual bool is_deoptimization_stub() const { return false; } 116 virtual bool is_uncommon_trap_stub() const { return false; } 117 virtual bool is_exception_stub() const { return false; } 118 virtual bool is_safepoint_stub() const { return false; } 119 virtual bool is_adapter_blob() const { return false; } 120 virtual bool is_method_handles_adapter_blob() const { return false; } 121 virtual bool is_compiled() const { return false; } 122 123 inline bool is_compiled_by_c1() const { return _type == compiler_c1; }; 124 inline bool is_compiled_by_c2() const { return _type == compiler_c2; }; 125 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; }; 126 inline bool is_compiled_by_shark() const { return _type == compiler_shark; }; 127 const char* compiler_name() const; 128 129 // Casting 130 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; } 131 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; } 132 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; } 133 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; } 134 135 // Boundaries 136 address header_begin() const { return (address) this; } 137 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; }; 138 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; } 139 address content_begin() const { return _content_begin; } 140 address content_end() const { return _code_end; } // _code_end == _content_end is true for all types of blobs for now, it is also checked in the constructor 141 address code_begin() const { return _code_begin; } 142 address code_end() const { return _code_end; } 143 address data_end() const { return _data_end; } 144 145 // This field holds the beginning of the const section in the old code buffer. 146 // It is needed to fix relocations of pc-relative loads when resizing the 147 // the constant pool or moving it. 148 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; }) 149 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) } 150 151 // Sizes 152 int size() const { return _size; } 153 int header_size() const { return _header_size; } 154 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); } 155 int content_size() const { return content_end() - content_begin(); } 156 int code_size() const { return code_end() - code_begin(); } 157 158 // Containment 159 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); } 160 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); } 161 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); } 162 bool is_frame_complete_at(address addr) const { return code_contains(addr) && addr >= code_begin() + _frame_complete_offset; } 163 164 // CodeCache support: really only used by the nmethods, but in order to get 165 // asserts and certain bookkeeping to work in the CodeCache they are defined 166 // virtual here. 167 virtual bool is_zombie() const { return false; } 168 virtual bool is_locked_by_vm() const { return false; } 169 170 virtual bool is_unloaded() const { return false; } 171 virtual bool is_not_entrant() const { return false; } 172 173 // GC support 174 virtual bool is_alive() const = 0; 175 176 // OopMap for frame 177 ImmutableOopMapSet* oop_maps() const { return _oop_maps; } 178 void set_oop_maps(OopMapSet* p); 179 const ImmutableOopMap* oop_map_for_return_address(address return_address); 180 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0; 181 182 // Frame support 183 int frame_size() const { return _frame_size; } 184 void set_frame_size(int size) { _frame_size = size; } 185 186 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments 187 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; } 188 189 // Naming 190 const char* name() const { return _name; } 191 void set_name(const char* name) { _name = name; } 192 193 // Debugging 194 virtual void verify() = 0; 195 virtual void print() const { print_on(tty); }; 196 virtual void print_on(outputStream* st) const; 197 virtual void print_value_on(outputStream* st) const; 198 void print_code(); 199 200 // Print the comment associated with offset on stream, if there is one 201 virtual void print_block_comment(outputStream* stream, address block_begin) const { 202 intptr_t offset = (intptr_t)(block_begin - code_begin()); 203 _strings.print_block_comment(stream, offset); 204 } 205 206 // Transfer ownership of comments to this CodeBlob 207 void set_strings(CodeStrings& strings) { 208 _strings.assign(strings); 209 } 210 211 static ByteSize name_field_offset() { 212 return byte_offset_of(CodeBlob, _name); 213 } 214 215 static ByteSize oop_maps_field_offset() { 216 return byte_offset_of(CodeBlob, _oop_maps); 217 } 218 }; 219 220 class CodeBlobLayout : public StackObj { 221 private: 222 int _size; 223 int _header_size; 224 int _relocation_size; 225 int _content_offset; 226 int _code_offset; 227 int _data_offset; 228 address _code_begin; 229 address _code_end; 230 address _content_begin; 231 address _content_end; 232 address _data_end; 233 address _relocation_begin; 234 address _relocation_end; 235 236 public: 237 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) : 238 _size(0), 239 _header_size(0), 240 _relocation_size(0), 241 _content_offset(0), 242 _code_offset(0), 243 _data_offset(0), 244 _content_begin(content_begin), 245 _content_end(content_end), 246 _code_begin(code_begin), 247 _code_end(code_end), 248 _data_end(data_end), 249 _relocation_begin(relocation_begin), 250 _relocation_end(relocation_end) 251 { 252 } 253 254 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) : 255 _size(size), 256 _header_size(header_size), 257 _relocation_size(relocation_size), 258 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)), 259 _code_offset(_content_offset), 260 _data_offset(data_offset) 261 { 262 assert(_relocation_size == round_to(_relocation_size, oopSize), "unaligned size"); 263 264 _code_begin = (address) start + _code_offset; 265 _code_end = (address) start + _data_offset; 266 267 _content_begin = (address) start + _content_offset; 268 _content_end = (address) start + _data_offset; 269 270 _data_end = (address) start + _size; 271 _relocation_begin = (address) start + _header_size; 272 _relocation_end = _relocation_begin + _relocation_size; 273 } 274 275 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) : 276 _size(size), 277 _header_size(header_size), 278 _relocation_size(round_to(cb->total_relocation_size(), oopSize)), 279 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)), 280 _code_offset(_content_offset + cb->total_offset_of(cb->insts())), 281 _data_offset(_content_offset + round_to(cb->total_content_size(), oopSize)) 282 { 283 assert(_relocation_size == round_to(_relocation_size, oopSize), "unaligned size"); 284 285 _code_begin = (address) start + _code_offset; 286 _code_end = (address) start + _data_offset; 287 288 _content_begin = (address) start + _content_offset; 289 _content_end = (address) start + _data_offset; 290 291 _data_end = (address) start + _size; 292 _relocation_begin = (address) start + _header_size; 293 _relocation_end = _relocation_begin + _relocation_size; 294 } 295 296 int size() const { return _size; } 297 int header_size() const { return _header_size; } 298 int relocation_size() const { return _relocation_size; } 299 int content_offset() const { return _content_offset; } 300 int code_offset() const { return _code_offset; } 301 int data_offset() const { return _data_offset; } 302 address code_begin() const { return _code_begin; } 303 address code_end() const { return _code_end; } 304 address data_end() const { return _data_end; } 305 address relocation_begin() const { return _relocation_begin; } 306 address relocation_end() const { return _relocation_end; } 307 address content_begin() const { return _content_begin; } 308 address content_end() const { return _content_end; } 309 }; 310 311 312 class RuntimeBlob : public CodeBlob { 313 friend class VMStructs; 314 public: 315 316 // Creation 317 // a) simple CodeBlob 318 // frame_complete is the offset from the beginning of the instructions 319 // to where the frame setup (from stackwalk viewpoint) is complete. 320 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size); 321 322 // b) full CodeBlob 323 RuntimeBlob( 324 const char* name, 325 CodeBuffer* cb, 326 int header_size, 327 int size, 328 int frame_complete, 329 int frame_size, 330 OopMapSet* oop_maps, 331 bool caller_must_gc_arguments = false 332 ); 333 334 // GC support 335 virtual bool is_alive() const = 0; 336 337 void verify(); 338 339 // OopMap for frame 340 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); } 341 342 // Debugging 343 void print() const { print_on(tty); } 344 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 345 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); } 346 347 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService. 348 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = ""); 349 }; 350 351 class WhiteBox; 352 //---------------------------------------------------------------------------------------------------- 353 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc. 354 355 class BufferBlob: public RuntimeBlob { 356 friend class VMStructs; 357 friend class AdapterBlob; 358 friend class MethodHandlesAdapterBlob; 359 friend class WhiteBox; 360 361 private: 362 // Creation support 363 BufferBlob(const char* name, int size); 364 BufferBlob(const char* name, int size, CodeBuffer* cb); 365 366 void* operator new(size_t s, unsigned size) throw(); 367 368 public: 369 // Creation 370 static BufferBlob* create(const char* name, int buffer_size); 371 static BufferBlob* create(const char* name, CodeBuffer* cb); 372 373 static void free(BufferBlob* buf); 374 375 // Typing 376 virtual bool is_buffer_blob() const { return true; } 377 378 // GC/Verification support 379 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } 380 bool is_alive() const { return true; } 381 382 void verify(); 383 void print_on(outputStream* st) const; 384 void print_value_on(outputStream* st) const; 385 }; 386 387 388 //---------------------------------------------------------------------------------------------------- 389 // AdapterBlob: used to hold C2I/I2C adapters 390 391 class AdapterBlob: public BufferBlob { 392 private: 393 AdapterBlob(int size, CodeBuffer* cb); 394 395 public: 396 // Creation 397 static AdapterBlob* create(CodeBuffer* cb); 398 399 // Typing 400 virtual bool is_adapter_blob() const { return true; } 401 }; 402 403 404 //---------------------------------------------------------------------------------------------------- 405 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters 406 407 class MethodHandlesAdapterBlob: public BufferBlob { 408 private: 409 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {} 410 411 public: 412 // Creation 413 static MethodHandlesAdapterBlob* create(int buffer_size); 414 415 // Typing 416 virtual bool is_method_handles_adapter_blob() const { return true; } 417 }; 418 419 420 //---------------------------------------------------------------------------------------------------- 421 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine 422 423 class RuntimeStub: public RuntimeBlob { 424 friend class VMStructs; 425 private: 426 // Creation support 427 RuntimeStub( 428 const char* name, 429 CodeBuffer* cb, 430 int size, 431 int frame_complete, 432 int frame_size, 433 OopMapSet* oop_maps, 434 bool caller_must_gc_arguments 435 ); 436 437 void* operator new(size_t s, unsigned size) throw(); 438 439 public: 440 // Creation 441 static RuntimeStub* new_runtime_stub( 442 const char* stub_name, 443 CodeBuffer* cb, 444 int frame_complete, 445 int frame_size, 446 OopMapSet* oop_maps, 447 bool caller_must_gc_arguments 448 ); 449 450 // Typing 451 bool is_runtime_stub() const { return true; } 452 453 address entry_point() const { return code_begin(); } 454 455 // GC/Verification support 456 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } 457 bool is_alive() const { return true; } 458 459 void verify(); 460 void print_on(outputStream* st) const; 461 void print_value_on(outputStream* st) const; 462 }; 463 464 465 //---------------------------------------------------------------------------------------------------- 466 // Super-class for all blobs that exist in only one instance. Implements default behaviour. 467 468 class SingletonBlob: public RuntimeBlob { 469 friend class VMStructs; 470 471 protected: 472 void* operator new(size_t s, unsigned size) throw(); 473 474 public: 475 SingletonBlob( 476 const char* name, 477 CodeBuffer* cb, 478 int header_size, 479 int size, 480 int frame_size, 481 OopMapSet* oop_maps 482 ) 483 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps) 484 {}; 485 486 address entry_point() { return code_begin(); } 487 488 bool is_alive() const { return true; } 489 490 // GC/Verification support 491 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } 492 void verify(); // does nothing 493 void print_on(outputStream* st) const; 494 void print_value_on(outputStream* st) const; 495 }; 496 497 498 //---------------------------------------------------------------------------------------------------- 499 // DeoptimizationBlob 500 501 class DeoptimizationBlob: public SingletonBlob { 502 friend class VMStructs; 503 friend class JVMCIVMStructs; 504 private: 505 int _unpack_offset; 506 int _unpack_with_exception; 507 int _unpack_with_reexecution; 508 509 int _unpack_with_exception_in_tls; 510 511 #if INCLUDE_JVMCI 512 // Offsets when JVMCI calls uncommon_trap. 513 int _uncommon_trap_offset; 514 int _implicit_exception_uncommon_trap_offset; 515 #endif 516 517 // Creation support 518 DeoptimizationBlob( 519 CodeBuffer* cb, 520 int size, 521 OopMapSet* oop_maps, 522 int unpack_offset, 523 int unpack_with_exception_offset, 524 int unpack_with_reexecution_offset, 525 int frame_size 526 ); 527 528 public: 529 // Creation 530 static DeoptimizationBlob* create( 531 CodeBuffer* cb, 532 OopMapSet* oop_maps, 533 int unpack_offset, 534 int unpack_with_exception_offset, 535 int unpack_with_reexecution_offset, 536 int frame_size 537 ); 538 539 // Typing 540 bool is_deoptimization_stub() const { return true; } 541 bool exception_address_is_unpack_entry(address pc) const { 542 address unpack_pc = unpack(); 543 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc); 544 } 545 546 // GC for args 547 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ } 548 549 // Printing 550 void print_value_on(outputStream* st) const; 551 552 address unpack() const { return code_begin() + _unpack_offset; } 553 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; } 554 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; } 555 556 // Alternate entry point for C1 where the exception and issuing pc 557 // are in JavaThread::_exception_oop and JavaThread::_exception_pc 558 // instead of being in registers. This is needed because C1 doesn't 559 // model exception paths in a way that keeps these registers free so 560 // there may be live values in those registers during deopt. 561 void set_unpack_with_exception_in_tls_offset(int offset) { 562 _unpack_with_exception_in_tls = offset; 563 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob"); 564 } 565 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; } 566 567 #if INCLUDE_JVMCI 568 // Offsets when JVMCI calls uncommon_trap. 569 void set_uncommon_trap_offset(int offset) { 570 _uncommon_trap_offset = offset; 571 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob"); 572 } 573 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; } 574 575 void set_implicit_exception_uncommon_trap_offset(int offset) { 576 _implicit_exception_uncommon_trap_offset = offset; 577 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob"); 578 } 579 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; } 580 #endif // INCLUDE_JVMCI 581 }; 582 583 584 //---------------------------------------------------------------------------------------------------- 585 // UncommonTrapBlob (currently only used by Compiler 2) 586 587 #ifdef COMPILER2 588 589 class UncommonTrapBlob: public SingletonBlob { 590 friend class VMStructs; 591 private: 592 // Creation support 593 UncommonTrapBlob( 594 CodeBuffer* cb, 595 int size, 596 OopMapSet* oop_maps, 597 int frame_size 598 ); 599 600 public: 601 // Creation 602 static UncommonTrapBlob* create( 603 CodeBuffer* cb, 604 OopMapSet* oop_maps, 605 int frame_size 606 ); 607 608 // GC for args 609 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } 610 611 // Typing 612 bool is_uncommon_trap_stub() const { return true; } 613 }; 614 615 616 //---------------------------------------------------------------------------------------------------- 617 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2) 618 619 class ExceptionBlob: public SingletonBlob { 620 friend class VMStructs; 621 private: 622 // Creation support 623 ExceptionBlob( 624 CodeBuffer* cb, 625 int size, 626 OopMapSet* oop_maps, 627 int frame_size 628 ); 629 630 public: 631 // Creation 632 static ExceptionBlob* create( 633 CodeBuffer* cb, 634 OopMapSet* oop_maps, 635 int frame_size 636 ); 637 638 // GC for args 639 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } 640 641 // Typing 642 bool is_exception_stub() const { return true; } 643 }; 644 #endif // COMPILER2 645 646 647 //---------------------------------------------------------------------------------------------------- 648 // SafepointBlob: handles illegal_instruction exceptions during a safepoint 649 650 class SafepointBlob: public SingletonBlob { 651 friend class VMStructs; 652 private: 653 // Creation support 654 SafepointBlob( 655 CodeBuffer* cb, 656 int size, 657 OopMapSet* oop_maps, 658 int frame_size 659 ); 660 661 public: 662 // Creation 663 static SafepointBlob* create( 664 CodeBuffer* cb, 665 OopMapSet* oop_maps, 666 int frame_size 667 ); 668 669 // GC for args 670 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } 671 672 // Typing 673 bool is_safepoint_stub() const { return true; } 674 }; 675 676 #endif // SHARE_VM_CODE_CODEBLOB_HPP