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/align.hpp" 34 #include "utilities/macros.hpp" 35 36 // CodeBlob Types 37 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps 38 struct CodeBlobType { 39 enum { 40 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods) 41 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods 42 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs 43 All = 3, // All types (No code cache segmentation) 44 AOT = 4, // AOT methods 45 NumTypes = 5 // Number of CodeBlobTypes 46 }; 47 }; 48 49 // CodeBlob - superclass for all entries in the CodeCache. 50 // 51 // Subtypes are: 52 // CompiledMethod : Compiled Java methods (include method that calls to native code) 53 // nmethod : JIT Compiled Java methods 54 // RuntimeBlob : Non-compiled method code; generated glue code 55 // RuntimeStub : Call to VM runtime methods 56 // DeoptimizationBlob : Used for deoptimization 57 // ExceptionBlob : Used for stack unrolling 58 // SafepointBlob : Used to handle illegal instruction exceptions 59 // 60 // 61 // Layout: 62 // - header 63 // - relocation 64 // - content space 65 // - instruction space 66 // - data space 67 68 69 class CodeBlobLayout; 70 71 class CodeBlob VALUE_OBJ_CLASS_SPEC { 72 friend class VMStructs; 73 friend class JVMCIVMStructs; 74 friend class CodeCacheDumper; 75 76 protected: 77 78 const CompilerType _type; // CompilerType 79 int _size; // total size of CodeBlob in bytes 80 int _header_size; // size of header (depends on subclass) 81 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have 82 // not finished setting up their frame. Beware of pc's in 83 // that range. There is a similar range(s) on returns 84 // which we don't detect. 85 int _data_offset; // offset to where data region begins 86 int _frame_size; // size of stack frame 87 88 address _code_begin; 89 address _code_end; 90 address _content_begin; // address to where content region begins (this includes consts, insts, stubs) 91 // address _content_end - not required, for all CodeBlobs _code_end == _content_end for now 92 address _data_end; 93 address _relocation_begin; 94 address _relocation_end; 95 96 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob 97 bool _caller_must_gc_arguments; 98 CodeStrings _strings; 99 const char* _name; 100 S390_ONLY(int _ctable_offset;) 101 102 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments); 103 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); 104 public: 105 // Returns the space needed for CodeBlob 106 static unsigned int allocation_size(CodeBuffer* cb, int header_size); 107 static unsigned int align_code_offset(int offset); 108 109 // Deletion 110 virtual void flush(); 111 112 // Typing 113 virtual bool is_buffer_blob() const { return false; } 114 virtual bool is_nmethod() const { return false; } 115 virtual bool is_runtime_stub() const { return false; } 116 virtual bool is_deoptimization_stub() const { return false; } 117 virtual bool is_uncommon_trap_stub() const { return false; } 118 virtual bool is_exception_stub() const { return false; } 119 virtual bool is_safepoint_stub() const { return false; } 120 virtual bool is_adapter_blob() const { return false; } 121 virtual bool is_method_handles_adapter_blob() const { return false; } 122 virtual bool is_aot() const { return false; } 123 virtual bool is_compiled() const { return false; } 124 125 inline bool is_compiled_by_c1() const { return _type == compiler_c1; }; 126 inline bool is_compiled_by_c2() const { return _type == compiler_c2; }; 127 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; }; 128 inline bool is_compiled_by_shark() const { return _type == compiler_shark; }; 129 const char* compiler_name() const; 130 131 // Casting 132 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; } 133 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; } 134 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; } 135 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; } 136 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; } 137 138 // Boundaries 139 address header_begin() const { return (address) this; } 140 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; }; 141 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; } 142 address content_begin() const { return _content_begin; } 143 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 144 address code_begin() const { return _code_begin; } 145 address code_end() const { return _code_end; } 146 address data_end() const { return _data_end; } 147 148 // This field holds the beginning of the const section in the old code buffer. 149 // It is needed to fix relocations of pc-relative loads when resizing the 150 // the constant pool or moving it. 151 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; }) 152 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) } 153 154 // Sizes 155 int size() const { return _size; } 156 int header_size() const { return _header_size; } 157 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); } 158 int content_size() const { return content_end() - content_begin(); } 159 int code_size() const { return code_end() - code_begin(); } 160 161 // Containment 162 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); } 163 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); } 164 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); } 165 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe && 166 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; } 167 168 // CodeCache support: really only used by the nmethods, but in order to get 169 // asserts and certain bookkeeping to work in the CodeCache they are defined 170 // virtual here. 171 virtual bool is_zombie() const { return false; } 172 virtual bool is_locked_by_vm() const { return false; } 173 174 virtual bool is_unloaded() const { return false; } 175 virtual bool is_not_entrant() const { return false; } 176 177 // GC support 178 virtual bool is_alive() const = 0; 179 180 // OopMap for frame 181 ImmutableOopMapSet* oop_maps() const { return _oop_maps; } 182 void set_oop_maps(OopMapSet* p); 183 const ImmutableOopMap* oop_map_for_return_address(address return_address); 184 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0; 185 186 // Frame support 187 int frame_size() const { return _frame_size; } 188 void set_frame_size(int size) { _frame_size = size; } 189 190 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments 191 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; } 192 193 // Naming 194 const char* name() const { return _name; } 195 void set_name(const char* name) { _name = name; } 196 197 // Debugging 198 virtual void verify() = 0; 199 virtual void print() const { print_on(tty); }; 200 virtual void print_on(outputStream* st) const; 201 virtual void print_value_on(outputStream* st) const; 202 void print_code(); 203 204 // Print the comment associated with offset on stream, if there is one 205 virtual void print_block_comment(outputStream* stream, address block_begin) const { 206 intptr_t offset = (intptr_t)(block_begin - code_begin()); 207 _strings.print_block_comment(stream, offset); 208 } 209 210 // Transfer ownership of comments to this CodeBlob 211 void set_strings(CodeStrings& strings) { 212 assert(!is_aot(), "invalid on aot"); 213 _strings.assign(strings); 214 } 215 216 static ByteSize name_field_offset() { 217 return byte_offset_of(CodeBlob, _name); 218 } 219 220 static ByteSize oop_maps_field_offset() { 221 return byte_offset_of(CodeBlob, _oop_maps); 222 } 223 }; 224 225 class CodeBlobLayout : public StackObj { 226 private: 227 int _size; 228 int _header_size; 229 int _relocation_size; 230 int _content_offset; 231 int _code_offset; 232 int _data_offset; 233 address _code_begin; 234 address _code_end; 235 address _content_begin; 236 address _content_end; 237 address _data_end; 238 address _relocation_begin; 239 address _relocation_end; 240 241 public: 242 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) : 243 _size(0), 244 _header_size(0), 245 _relocation_size(0), 246 _content_offset(0), 247 _code_offset(0), 248 _data_offset(0), 249 _content_begin(content_begin), 250 _content_end(content_end), 251 _code_begin(code_begin), 252 _code_end(code_end), 253 _data_end(data_end), 254 _relocation_begin(relocation_begin), 255 _relocation_end(relocation_end) 256 { 257 } 258 259 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) : 260 _size(size), 261 _header_size(header_size), 262 _relocation_size(relocation_size), 263 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)), 264 _code_offset(_content_offset), 265 _data_offset(data_offset) 266 { 267 assert(is_aligned(_relocation_size, oopSize), "unaligned size"); 268 269 _code_begin = (address) start + _code_offset; 270 _code_end = (address) start + _data_offset; 271 272 _content_begin = (address) start + _content_offset; 273 _content_end = (address) start + _data_offset; 274 275 _data_end = (address) start + _size; 276 _relocation_begin = (address) start + _header_size; 277 _relocation_end = _relocation_begin + _relocation_size; 278 } 279 280 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) : 281 _size(size), 282 _header_size(header_size), 283 _relocation_size(align_up(cb->total_relocation_size(), oopSize)), 284 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)), 285 _code_offset(_content_offset + cb->total_offset_of(cb->insts())), 286 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize)) 287 { 288 assert(is_aligned(_relocation_size, oopSize), "unaligned size"); 289 290 _code_begin = (address) start + _code_offset; 291 _code_end = (address) start + _data_offset; 292 293 _content_begin = (address) start + _content_offset; 294 _content_end = (address) start + _data_offset; 295 296 _data_end = (address) start + _size; 297 _relocation_begin = (address) start + _header_size; 298 _relocation_end = _relocation_begin + _relocation_size; 299 } 300 301 int size() const { return _size; } 302 int header_size() const { return _header_size; } 303 int relocation_size() const { return _relocation_size; } 304 int content_offset() const { return _content_offset; } 305 int code_offset() const { return _code_offset; } 306 int data_offset() const { return _data_offset; } 307 address code_begin() const { return _code_begin; } 308 address code_end() const { return _code_end; } 309 address data_end() const { return _data_end; } 310 address relocation_begin() const { return _relocation_begin; } 311 address relocation_end() const { return _relocation_end; } 312 address content_begin() const { return _content_begin; } 313 address content_end() const { return _content_end; } 314 }; 315 316 317 class RuntimeBlob : public CodeBlob { 318 friend class VMStructs; 319 public: 320 321 // Creation 322 // a) simple CodeBlob 323 // frame_complete is the offset from the beginning of the instructions 324 // to where the frame setup (from stackwalk viewpoint) is complete. 325 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size); 326 327 // b) full CodeBlob 328 RuntimeBlob( 329 const char* name, 330 CodeBuffer* cb, 331 int header_size, 332 int size, 333 int frame_complete, 334 int frame_size, 335 OopMapSet* oop_maps, 336 bool caller_must_gc_arguments = false 337 ); 338 339 // GC support 340 virtual bool is_alive() const = 0; 341 342 void verify(); 343 344 // OopMap for frame 345 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); } 346 347 // Debugging 348 void print() const { print_on(tty); } 349 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } 350 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); } 351 352 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService. 353 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = ""); 354 }; 355 356 class WhiteBox; 357 //---------------------------------------------------------------------------------------------------- 358 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc. 359 360 class BufferBlob: public RuntimeBlob { 361 friend class VMStructs; 362 friend class AdapterBlob; 363 friend class MethodHandlesAdapterBlob; 364 friend class WhiteBox; 365 366 private: 367 // Creation support 368 BufferBlob(const char* name, int size); 369 BufferBlob(const char* name, int size, CodeBuffer* cb); 370 371 void* operator new(size_t s, unsigned size) throw(); 372 373 public: 374 // Creation 375 static BufferBlob* create(const char* name, int buffer_size); 376 static BufferBlob* create(const char* name, CodeBuffer* cb); 377 378 static void free(BufferBlob* buf); 379 380 // Typing 381 virtual bool is_buffer_blob() const { return true; } 382 383 // GC/Verification support 384 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } 385 bool is_alive() const { return true; } 386 387 void verify(); 388 void print_on(outputStream* st) const; 389 void print_value_on(outputStream* st) const; 390 }; 391 392 393 //---------------------------------------------------------------------------------------------------- 394 // AdapterBlob: used to hold C2I/I2C adapters 395 396 class AdapterBlob: public BufferBlob { 397 private: 398 AdapterBlob(int size, CodeBuffer* cb); 399 400 public: 401 // Creation 402 static AdapterBlob* create(CodeBuffer* cb); 403 404 // Typing 405 virtual bool is_adapter_blob() const { return true; } 406 }; 407 408 409 //---------------------------------------------------------------------------------------------------- 410 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters 411 412 class MethodHandlesAdapterBlob: public BufferBlob { 413 private: 414 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {} 415 416 public: 417 // Creation 418 static MethodHandlesAdapterBlob* create(int buffer_size); 419 420 // Typing 421 virtual bool is_method_handles_adapter_blob() const { return true; } 422 }; 423 424 425 //---------------------------------------------------------------------------------------------------- 426 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine 427 428 class RuntimeStub: public RuntimeBlob { 429 friend class VMStructs; 430 private: 431 // Creation support 432 RuntimeStub( 433 const char* name, 434 CodeBuffer* cb, 435 int size, 436 int frame_complete, 437 int frame_size, 438 OopMapSet* oop_maps, 439 bool caller_must_gc_arguments 440 ); 441 442 void* operator new(size_t s, unsigned size) throw(); 443 444 public: 445 // Creation 446 static RuntimeStub* new_runtime_stub( 447 const char* stub_name, 448 CodeBuffer* cb, 449 int frame_complete, 450 int frame_size, 451 OopMapSet* oop_maps, 452 bool caller_must_gc_arguments 453 ); 454 455 // Typing 456 bool is_runtime_stub() const { return true; } 457 458 address entry_point() const { return code_begin(); } 459 460 // GC/Verification support 461 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } 462 bool is_alive() const { return true; } 463 464 void verify(); 465 void print_on(outputStream* st) const; 466 void print_value_on(outputStream* st) const; 467 }; 468 469 470 //---------------------------------------------------------------------------------------------------- 471 // Super-class for all blobs that exist in only one instance. Implements default behaviour. 472 473 class SingletonBlob: public RuntimeBlob { 474 friend class VMStructs; 475 476 protected: 477 void* operator new(size_t s, unsigned size) throw(); 478 479 public: 480 SingletonBlob( 481 const char* name, 482 CodeBuffer* cb, 483 int header_size, 484 int size, 485 int frame_size, 486 OopMapSet* oop_maps 487 ) 488 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps) 489 {}; 490 491 address entry_point() { return code_begin(); } 492 493 bool is_alive() const { return true; } 494 495 // GC/Verification support 496 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } 497 void verify(); // does nothing 498 void print_on(outputStream* st) const; 499 void print_value_on(outputStream* st) const; 500 }; 501 502 503 //---------------------------------------------------------------------------------------------------- 504 // DeoptimizationBlob 505 506 class DeoptimizationBlob: public SingletonBlob { 507 friend class VMStructs; 508 friend class JVMCIVMStructs; 509 private: 510 int _unpack_offset; 511 int _unpack_with_exception; 512 int _unpack_with_reexecution; 513 514 int _unpack_with_exception_in_tls; 515 516 #if INCLUDE_JVMCI 517 // Offsets when JVMCI calls uncommon_trap. 518 int _uncommon_trap_offset; 519 int _implicit_exception_uncommon_trap_offset; 520 #endif 521 522 // Creation support 523 DeoptimizationBlob( 524 CodeBuffer* cb, 525 int size, 526 OopMapSet* oop_maps, 527 int unpack_offset, 528 int unpack_with_exception_offset, 529 int unpack_with_reexecution_offset, 530 int frame_size 531 ); 532 533 public: 534 // Creation 535 static DeoptimizationBlob* create( 536 CodeBuffer* cb, 537 OopMapSet* oop_maps, 538 int unpack_offset, 539 int unpack_with_exception_offset, 540 int unpack_with_reexecution_offset, 541 int frame_size 542 ); 543 544 // Typing 545 bool is_deoptimization_stub() const { return true; } 546 bool exception_address_is_unpack_entry(address pc) const { 547 address unpack_pc = unpack(); 548 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc); 549 } 550 551 // GC for args 552 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ } 553 554 // Printing 555 void print_value_on(outputStream* st) const; 556 557 address unpack() const { return code_begin() + _unpack_offset; } 558 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; } 559 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; } 560 561 // Alternate entry point for C1 where the exception and issuing pc 562 // are in JavaThread::_exception_oop and JavaThread::_exception_pc 563 // instead of being in registers. This is needed because C1 doesn't 564 // model exception paths in a way that keeps these registers free so 565 // there may be live values in those registers during deopt. 566 void set_unpack_with_exception_in_tls_offset(int offset) { 567 _unpack_with_exception_in_tls = offset; 568 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob"); 569 } 570 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; } 571 572 #if INCLUDE_JVMCI 573 // Offsets when JVMCI calls uncommon_trap. 574 void set_uncommon_trap_offset(int offset) { 575 _uncommon_trap_offset = offset; 576 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob"); 577 } 578 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; } 579 580 void set_implicit_exception_uncommon_trap_offset(int offset) { 581 _implicit_exception_uncommon_trap_offset = offset; 582 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob"); 583 } 584 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; } 585 #endif // INCLUDE_JVMCI 586 }; 587 588 589 //---------------------------------------------------------------------------------------------------- 590 // UncommonTrapBlob (currently only used by Compiler 2) 591 592 #ifdef COMPILER2 593 594 class UncommonTrapBlob: public SingletonBlob { 595 friend class VMStructs; 596 private: 597 // Creation support 598 UncommonTrapBlob( 599 CodeBuffer* cb, 600 int size, 601 OopMapSet* oop_maps, 602 int frame_size 603 ); 604 605 public: 606 // Creation 607 static UncommonTrapBlob* create( 608 CodeBuffer* cb, 609 OopMapSet* oop_maps, 610 int frame_size 611 ); 612 613 // GC for args 614 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } 615 616 // Typing 617 bool is_uncommon_trap_stub() const { return true; } 618 }; 619 620 621 //---------------------------------------------------------------------------------------------------- 622 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2) 623 624 class ExceptionBlob: public SingletonBlob { 625 friend class VMStructs; 626 private: 627 // Creation support 628 ExceptionBlob( 629 CodeBuffer* cb, 630 int size, 631 OopMapSet* oop_maps, 632 int frame_size 633 ); 634 635 public: 636 // Creation 637 static ExceptionBlob* create( 638 CodeBuffer* cb, 639 OopMapSet* oop_maps, 640 int frame_size 641 ); 642 643 // GC for args 644 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } 645 646 // Typing 647 bool is_exception_stub() const { return true; } 648 }; 649 #endif // COMPILER2 650 651 652 //---------------------------------------------------------------------------------------------------- 653 // SafepointBlob: handles illegal_instruction exceptions during a safepoint 654 655 class SafepointBlob: public SingletonBlob { 656 friend class VMStructs; 657 private: 658 // Creation support 659 SafepointBlob( 660 CodeBuffer* cb, 661 int size, 662 OopMapSet* oop_maps, 663 int frame_size 664 ); 665 666 public: 667 // Creation 668 static SafepointBlob* create( 669 CodeBuffer* cb, 670 OopMapSet* oop_maps, 671 int frame_size 672 ); 673 674 // GC for args 675 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } 676 677 // Typing 678 bool is_safepoint_stub() const { return true; } 679 }; 680 681 #endif // SHARE_VM_CODE_CODEBLOB_HPP