1 /*
2 * Copyright (c) 1998, 2025, 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_CODE_CODEBLOB_HPP
26 #define SHARE_CODE_CODEBLOB_HPP
27
28 #include "asm/codeBuffer.hpp"
29 #include "compiler/compilerDefinitions.hpp"
30 #include "compiler/oopMap.hpp"
31 #include "runtime/javaFrameAnchor.hpp"
32 #include "runtime/frame.hpp"
33 #include "runtime/handles.hpp"
34 #include "utilities/align.hpp"
35 #include "utilities/macros.hpp"
36
37 class ImmutableOopMap;
38 class ImmutableOopMapSet;
39 class JNIHandleBlock;
40 class OopMapSet;
41
42 // CodeBlob Types
43 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
44 enum class CodeBlobType {
45 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
46 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
47 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
48 All = 3, // All types (No code cache segmentation)
49 NumTypes = 4 // Number of CodeBlobTypes
50 };
51
52 // CodeBlob - superclass for all entries in the CodeCache.
53 //
54 // Subtypes are:
55 // nmethod : JIT Compiled Java methods
56 // RuntimeBlob : Non-compiled method code; generated glue code
57 // BufferBlob : Used for non-relocatable code such as interpreter, stubroutines, etc.
58 // AdapterBlob : Used to hold C2I/I2C adapters
59 // VtableBlob : Used for holding vtable chunks
60 // MethodHandlesAdapterBlob : Used to hold MethodHandles adapters
61 // RuntimeStub : Call to VM runtime methods
62 // SingletonBlob : Super-class for all blobs that exist in only one instance
63 // DeoptimizationBlob : Used for deoptimization
64 // SafepointBlob : Used to handle illegal instruction exceptions
65 // ExceptionBlob : Used for stack unrolling
66 // UncommonTrapBlob : Used to handle uncommon traps
67 // UpcallStub : Used for upcalls from native code
68 //
69 //
70 // Layout : continuous in the CodeCache
71 // - header
72 // - relocation
73 // - content space
74 // - instruction space
75 // - data space
76
77 enum class CodeBlobKind : u1 {
78 None,
79 Nmethod,
80 Buffer,
81 Adapter,
82 Vtable,
83 MHAdapter,
84 RuntimeStub,
85 Deoptimization,
86 Safepoint,
87 #ifdef COMPILER2
88 Exception,
89 UncommonTrap,
90 #endif
91 Upcall,
92 Number_Of_Kinds
93 };
94
95 class UpcallStub; // for as_upcall_stub()
96 class RuntimeStub; // for as_runtime_stub()
97 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
98
99 class CodeBlob {
100 friend class VMStructs;
101 friend class JVMCIVMStructs;
102
103 protected:
104 // order fields from large to small to minimize padding between fields
105 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
106 const char* _name;
107
108 int _size; // total size of CodeBlob in bytes
109 int _relocation_size; // size of relocation (could be bigger than 64Kb)
110 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
111 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
112
113 int _data_offset; // offset to where data region begins
114 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
115
116 S390_ONLY(int _ctable_offset;)
117
118 uint16_t _header_size; // size of header (depends on subclass)
119 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
120 // not finished setting up their frame. Beware of pc's in
121 // that range. There is a similar range(s) on returns
122 // which we don't detect.
123
124 CodeBlobKind _kind; // Kind of this code blob
125
126 bool _caller_must_gc_arguments;
127
128 #ifndef PRODUCT
129 AsmRemarks _asm_remarks;
130 DbgStrings _dbg_strings;
131 #endif
132
133 void print_on_impl(outputStream* st) const;
134 void print_value_on_impl(outputStream* st) const;
135
136 class Vptr {
137 public:
138 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
139 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
140 };
141
142 const Vptr* vptr() const;
143
144 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
145 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments);
146
147 // Simple CodeBlob used for simple BufferBlob.
148 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
149
150 void operator delete(void* p) { }
151
152 public:
153
154 ~CodeBlob() {
155 assert(_oop_maps == nullptr, "Not flushed");
156 }
157
158 // Returns the space needed for CodeBlob
159 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
160 static unsigned int align_code_offset(int offset);
161
162 // Deletion
163 void purge();
164
165 // Typing
166 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
167 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
168 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
169 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
170 #ifdef COMPILER2
171 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
172 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
173 #else
174 bool is_uncommon_trap_stub() const { return false; }
175 bool is_exception_stub() const { return false; }
176 #endif
177 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
178 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
179 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
180 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
181 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
182
183 // Casting
184 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
185 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
186 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
187 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
188 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
189
190 // Boundaries
191 address header_begin() const { return (address) this; }
192 address header_end() const { return ((address) this) + _header_size; }
193 relocInfo* relocation_begin() const { return (relocInfo*) header_end(); }
194 relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); }
195 address content_begin() const { return (address) header_begin() + _content_offset; }
196 address content_end() const { return (address) header_begin() + _data_offset; }
197 address code_begin() const { return (address) header_begin() + _code_offset; }
198 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
199 address code_end() const { return (address) header_begin() + _data_offset; }
200 address data_begin() const { return (address) header_begin() + _data_offset; }
201 address data_end() const { return (address) header_begin() + _size; }
202
203 // Offsets
204 int content_offset() const { return _content_offset; }
205 int code_offset() const { return _code_offset; }
206 int data_offset() const { return _data_offset; }
207
208 // This field holds the beginning of the const section in the old code buffer.
209 // It is needed to fix relocations of pc-relative loads when resizing the
210 // the constant pool or moving it.
211 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
212 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
213
214 // Sizes
215 int size() const { return _size; }
216 int header_size() const { return _header_size; }
217 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
218 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
219 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
220
221 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
222 void adjust_size(size_t used) {
223 _size = (int)used;
224 _data_offset = (int)used;
225 }
226
227 // Containment
228 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
229 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
230 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
231 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
232 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
233 int frame_complete_offset() const { return _frame_complete_offset; }
234
235 // OopMap for frame
236 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
237 void set_oop_maps(OopMapSet* p);
238
239 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
240 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
241
242 // Frame support. Sizes are in word units.
243 int frame_size() const { return _frame_size; }
244 void set_frame_size(int size) { _frame_size = size; }
245
246 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
247 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
248
249 // Naming
250 const char* name() const { return _name; }
251 void set_name(const char* name) { _name = name; }
252
253 // Debugging
254 void verify();
255 void print() const;
256 void print_on(outputStream* st) const;
257 void print_value_on(outputStream* st) const;
258
259 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
260 void print_code_on(outputStream* st);
261
262 // Print to stream, any comments associated with offset.
263 void print_block_comment(outputStream* stream, address block_begin) const;
264
265 #ifndef PRODUCT
266 AsmRemarks &asm_remarks() { return _asm_remarks; }
267 DbgStrings &dbg_strings() { return _dbg_strings; }
268
269 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
270 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
271 #endif
272 };
273
274 //----------------------------------------------------------------------------------------------------
275 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
276
277 class RuntimeBlob : public CodeBlob {
278 friend class VMStructs;
279 public:
280
281 // Creation
282 // a) simple CodeBlob
283 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
284 : CodeBlob(name, kind, size, header_size)
285 {}
286
287 // b) full CodeBlob
288 // frame_complete is the offset from the beginning of the instructions
289 // to where the frame setup (from stackwalk viewpoint) is complete.
290 RuntimeBlob(
291 const char* name,
292 CodeBlobKind kind,
293 CodeBuffer* cb,
294 int size,
295 uint16_t header_size,
296 int16_t frame_complete,
297 int frame_size,
298 OopMapSet* oop_maps,
299 bool caller_must_gc_arguments = false
300 );
301
302 static void free(RuntimeBlob* blob);
303
304 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
305 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
306
307 class Vptr : public CodeBlob::Vptr {
308 };
309 };
310
311 class WhiteBox;
312 //----------------------------------------------------------------------------------------------------
313 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
314
315 class BufferBlob: public RuntimeBlob {
316 friend class VMStructs;
317 friend class AdapterBlob;
318 friend class VtableBlob;
319 friend class MethodHandlesAdapterBlob;
320 friend class UpcallStub;
321 friend class WhiteBox;
322
323 private:
324 // Creation support
325 BufferBlob(const char* name, CodeBlobKind kind, int size);
326 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size);
327
328 void* operator new(size_t s, unsigned size) throw();
329
330 public:
331 // Creation
332 static BufferBlob* create(const char* name, uint buffer_size);
333 static BufferBlob* create(const char* name, CodeBuffer* cb);
334
335 static void free(BufferBlob* buf);
336
337 void print_on_impl(outputStream* st) const;
338 void print_value_on_impl(outputStream* st) const;
339
340 class Vptr : public RuntimeBlob::Vptr {
341 void print_on(const CodeBlob* instance, outputStream* st) const override {
342 ((const BufferBlob*)instance)->print_on_impl(st);
343 }
344 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
345 ((const BufferBlob*)instance)->print_value_on_impl(st);
346 }
347 };
348
349 static const Vptr _vpntr;
350 };
351
352
353 //----------------------------------------------------------------------------------------------------
354 // AdapterBlob: used to hold C2I/I2C adapters
355
356 class AdapterBlob: public BufferBlob {
357 private:
358 AdapterBlob(int size, CodeBuffer* cb);
359
360 public:
361 // Creation
362 static AdapterBlob* create(CodeBuffer* cb);
363 };
364
365 //---------------------------------------------------------------------------------------------------
366 class VtableBlob: public BufferBlob {
367 private:
368 VtableBlob(const char*, int);
369
370 void* operator new(size_t s, unsigned size) throw();
371
372 public:
373 // Creation
374 static VtableBlob* create(const char* name, int buffer_size);
375 };
376
377 //----------------------------------------------------------------------------------------------------
378 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
379
380 class MethodHandlesAdapterBlob: public BufferBlob {
381 private:
382 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
383
384 public:
385 // Creation
386 static MethodHandlesAdapterBlob* create(int buffer_size);
387 };
388
389
390 //----------------------------------------------------------------------------------------------------
391 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
392
393 class RuntimeStub: public RuntimeBlob {
394 friend class VMStructs;
395 private:
396 // Creation support
397 RuntimeStub(
398 const char* name,
399 CodeBuffer* cb,
400 int size,
401 int16_t frame_complete,
402 int frame_size,
403 OopMapSet* oop_maps,
404 bool caller_must_gc_arguments
405 );
406
407 void* operator new(size_t s, unsigned size) throw();
408
409 public:
410 // Creation
411 static RuntimeStub* new_runtime_stub(
412 const char* stub_name,
413 CodeBuffer* cb,
414 int16_t frame_complete,
415 int frame_size,
416 OopMapSet* oop_maps,
417 bool caller_must_gc_arguments,
418 bool alloc_fail_is_fatal=true
419 );
420
421 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
422
423 address entry_point() const { return code_begin(); }
424
425 void print_on_impl(outputStream* st) const;
426 void print_value_on_impl(outputStream* st) const;
427
428 class Vptr : public RuntimeBlob::Vptr {
429 void print_on(const CodeBlob* instance, outputStream* st) const override {
430 instance->as_runtime_stub()->print_on_impl(st);
431 }
432 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
433 instance->as_runtime_stub()->print_value_on_impl(st);
434 }
435 };
436
437 static const Vptr _vpntr;
438 };
439
440
441 //----------------------------------------------------------------------------------------------------
442 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
443
444 class SingletonBlob: public RuntimeBlob {
445 friend class VMStructs;
446
447 protected:
448 void* operator new(size_t s, unsigned size) throw();
449
450 public:
451 SingletonBlob(
452 const char* name,
453 CodeBlobKind kind,
454 CodeBuffer* cb,
455 int size,
456 uint16_t header_size,
457 int frame_size,
458 OopMapSet* oop_maps
459 )
460 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
461 {};
462
463 address entry_point() { return code_begin(); }
464
465 void print_on_impl(outputStream* st) const;
466 void print_value_on_impl(outputStream* st) const;
467
468 class Vptr : public RuntimeBlob::Vptr {
469 void print_on(const CodeBlob* instance, outputStream* st) const override {
470 ((const SingletonBlob*)instance)->print_on_impl(st);
471 }
472 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
473 ((const SingletonBlob*)instance)->print_value_on_impl(st);
474 }
475 };
476
477 static const Vptr _vpntr;
478 };
479
480
481 //----------------------------------------------------------------------------------------------------
482 // DeoptimizationBlob
483
484 class DeoptimizationBlob: public SingletonBlob {
485 friend class VMStructs;
486 friend class JVMCIVMStructs;
487 private:
488 int _unpack_offset;
489 int _unpack_with_exception;
490 int _unpack_with_reexecution;
491
492 int _unpack_with_exception_in_tls;
493
494 #if INCLUDE_JVMCI
495 // Offsets when JVMCI calls uncommon_trap.
496 int _uncommon_trap_offset;
497 int _implicit_exception_uncommon_trap_offset;
498 #endif
499
500 // Creation support
501 DeoptimizationBlob(
502 CodeBuffer* cb,
503 int size,
504 OopMapSet* oop_maps,
505 int unpack_offset,
506 int unpack_with_exception_offset,
507 int unpack_with_reexecution_offset,
508 int frame_size
509 );
510
511 public:
512 // Creation
513 static DeoptimizationBlob* create(
514 CodeBuffer* cb,
515 OopMapSet* oop_maps,
516 int unpack_offset,
517 int unpack_with_exception_offset,
518 int unpack_with_reexecution_offset,
519 int frame_size
520 );
521
522 address unpack() const { return code_begin() + _unpack_offset; }
523 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
524 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
525
526 // Alternate entry point for C1 where the exception and issuing pc
527 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
528 // instead of being in registers. This is needed because C1 doesn't
529 // model exception paths in a way that keeps these registers free so
530 // there may be live values in those registers during deopt.
531 void set_unpack_with_exception_in_tls_offset(int offset) {
532 _unpack_with_exception_in_tls = offset;
533 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
534 }
535 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
536
537 #if INCLUDE_JVMCI
538 // Offsets when JVMCI calls uncommon_trap.
539 void set_uncommon_trap_offset(int offset) {
540 _uncommon_trap_offset = offset;
541 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
542 }
543 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
544
545 void set_implicit_exception_uncommon_trap_offset(int offset) {
546 _implicit_exception_uncommon_trap_offset = offset;
547 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
548 }
549 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
550 #endif // INCLUDE_JVMCI
551
552 void print_value_on_impl(outputStream* st) const;
553
554 class Vptr : public SingletonBlob::Vptr {
555 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
556 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
557 }
558 };
559
560 static const Vptr _vpntr;
561 };
562
563
564 //----------------------------------------------------------------------------------------------------
565 // UncommonTrapBlob (currently only used by Compiler 2)
566
567 #ifdef COMPILER2
568
569 class UncommonTrapBlob: public SingletonBlob {
570 friend class VMStructs;
571 private:
572 // Creation support
573 UncommonTrapBlob(
574 CodeBuffer* cb,
575 int size,
576 OopMapSet* oop_maps,
577 int frame_size
578 );
579
580 public:
581 // Creation
582 static UncommonTrapBlob* create(
583 CodeBuffer* cb,
584 OopMapSet* oop_maps,
585 int frame_size
586 );
587 };
588
589
590 //----------------------------------------------------------------------------------------------------
591 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
592
593 class ExceptionBlob: public SingletonBlob {
594 friend class VMStructs;
595 private:
596 // Creation support
597 ExceptionBlob(
598 CodeBuffer* cb,
599 int size,
600 OopMapSet* oop_maps,
601 int frame_size
602 );
603
604 public:
605 // Creation
606 static ExceptionBlob* create(
607 CodeBuffer* cb,
608 OopMapSet* oop_maps,
609 int frame_size
610 );
611 };
612 #endif // COMPILER2
613
614
615 //----------------------------------------------------------------------------------------------------
616 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
617
618 class SafepointBlob: public SingletonBlob {
619 friend class VMStructs;
620 private:
621 // Creation support
622 SafepointBlob(
623 CodeBuffer* cb,
624 int size,
625 OopMapSet* oop_maps,
626 int frame_size
627 );
628
629 public:
630 // Creation
631 static SafepointBlob* create(
632 CodeBuffer* cb,
633 OopMapSet* oop_maps,
634 int frame_size
635 );
636 };
637
638 //----------------------------------------------------------------------------------------------------
639
640 class UpcallLinker;
641
642 // A (Panama) upcall stub. Not used by JNI.
643 class UpcallStub: public RuntimeBlob {
644 friend class VMStructs;
645 friend class UpcallLinker;
646 private:
647 jobject _receiver;
648 ByteSize _frame_data_offset;
649
650 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
651
652 void* operator new(size_t s, unsigned size) throw();
653
654 struct FrameData {
655 JavaFrameAnchor jfa;
656 JavaThread* thread;
657 JNIHandleBlock* old_handles;
658 JNIHandleBlock* new_handles;
659 };
660
661 // defined in frame_ARCH.cpp
662 FrameData* frame_data_for_frame(const frame& frame) const;
663 public:
664 // Creation
665 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
666
667 static void free(UpcallStub* blob);
668
669 jobject receiver() { return _receiver; }
670
671 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
672
673 // GC support
674 void oops_do(OopClosure* f, const frame& frame);
675
676 void print_on_impl(outputStream* st) const;
677 void print_value_on_impl(outputStream* st) const;
678
679 class Vptr : public RuntimeBlob::Vptr {
680 void print_on(const CodeBlob* instance, outputStream* st) const override {
681 instance->as_upcall_stub()->print_on_impl(st);
682 }
683 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
684 instance->as_upcall_stub()->print_value_on_impl(st);
685 }
686 };
687
688 static const Vptr _vpntr;
689 };
690
691 #endif // SHARE_CODE_CODEBLOB_HPP