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