1 /*
2 * Copyright (c) 1998, 2024, 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 // BufferedInlineTypeBlob : used for pack/unpack handlers
62 // RuntimeStub : Call to VM runtime methods
63 // SingletonBlob : Super-class for all blobs that exist in only one instance
64 // DeoptimizationBlob : Used for deoptimization
65 // ExceptionBlob : Used for stack unrolling
66 // SafepointBlob : Used to handle illegal instruction exceptions
67 // UncommonTrapBlob : Used to handle uncommon traps
68 // UpcallStub : Used for upcalls from native code
69 //
70 //
71 // Layout : continuous in the CodeCache
72 // - header
73 // - relocation
74 // - content space
75 // - instruction space
76 // - data space
77
78 enum class CodeBlobKind : u1 {
79 None,
80 Nmethod,
81 Buffer,
82 Adapter,
83 Vtable,
84 MH_Adapter,
85 BufferedInlineType,
86 Runtime_Stub,
87 Deoptimization,
88 Exception,
89 Safepoint,
90 Uncommon_Trap,
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 friend class CodeCacheDumper;
103
104 protected:
105 // order fields from large to small to minimize padding between fields
106 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
107 const char* _name;
108
109 int _size; // total size of CodeBlob in bytes
110 int _relocation_size; // size of relocation (could be bigger than 64Kb)
111 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
112 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
113
114 int _data_offset; // offset to where data region begins
115 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
116
117 S390_ONLY(int _ctable_offset;)
118
119 uint16_t _header_size; // size of header (depends on subclass)
120 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
121 // not finished setting up their frame. Beware of pc's in
122 // that range. There is a similar range(s) on returns
123 // which we don't detect.
124
125 CodeBlobKind _kind; // Kind of this code blob
126
127 bool _caller_must_gc_arguments;
128
129 #ifndef PRODUCT
130 AsmRemarks _asm_remarks;
131 DbgStrings _dbg_strings;
132 #endif
133
134 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
135 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments);
136
137 // Simple CodeBlob used for simple BufferBlob.
138 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
139
140 void operator delete(void* p) { }
141
142 public:
143
144 virtual ~CodeBlob() {
145 assert(_oop_maps == nullptr, "Not flushed");
146 }
147
148 // Returns the space needed for CodeBlob
149 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
150 static unsigned int align_code_offset(int offset);
151
152 // Deletion
153 void purge();
154
155 // Typing
156 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
157 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
158 bool is_runtime_stub() const { return _kind == CodeBlobKind::Runtime_Stub; }
159 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
160 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::Uncommon_Trap; }
161 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
162 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
163 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
164 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
165 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MH_Adapter; }
166 bool is_buffered_inline_type_blob() const { return _kind == CodeBlobKind::BufferedInlineType; }
167 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
168
169 // Casting
170 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : nullptr; }
171 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
172 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
173 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
174 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
175
176 // Boundaries
177 address header_begin() const { return (address) this; }
178 address header_end() const { return ((address) this) + _header_size; }
179 relocInfo* relocation_begin() const { return (relocInfo*) header_end(); }
180 relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); }
181 address content_begin() const { return (address) header_begin() + _content_offset; }
182 address content_end() const { return (address) header_begin() + _data_offset; }
183 address code_begin() const { return (address) header_begin() + _code_offset; }
184 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
185 address code_end() const { return (address) header_begin() + _data_offset; }
186 address data_begin() const { return (address) header_begin() + _data_offset; }
187 address data_end() const { return (address) header_begin() + _size; }
188
189 // Offsets
190 int content_offset() const { return _content_offset; }
191 int code_offset() const { return _code_offset; }
192 int data_offset() const { return _data_offset; }
193
194 // This field holds the beginning of the const section in the old code buffer.
195 // It is needed to fix relocations of pc-relative loads when resizing the
196 // the constant pool or moving it.
197 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
198 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
199
200 // Sizes
201 int size() const { return _size; }
202 int header_size() const { return _header_size; }
203 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
204 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
205 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
206
207 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
208 void adjust_size(size_t used) {
209 _size = (int)used;
210 _data_offset = (int)used;
211 }
212
213 // Containment
214 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
215 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
216 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
217 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
218 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
219 int frame_complete_offset() const { return _frame_complete_offset; }
220
221 // OopMap for frame
222 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
223 void set_oop_maps(OopMapSet* p);
224
225 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
226 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
227
228 // Frame support. Sizes are in word units.
229 int frame_size() const { return _frame_size; }
230 void set_frame_size(int size) { _frame_size = size; }
231
232 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
233 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
234
235 // Naming
236 const char* name() const { return _name; }
237 void set_name(const char* name) { _name = name; }
238
239 // Debugging
240 virtual void verify() = 0;
241 virtual void print() const;
242 virtual void print_on(outputStream* st) const;
243 virtual void print_value_on(outputStream* st) const;
244 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
245 void print_code_on(outputStream* st);
246
247 // Print to stream, any comments associated with offset.
248 virtual void print_block_comment(outputStream* stream, address block_begin) const {
249 #ifndef PRODUCT
250 ptrdiff_t offset = block_begin - code_begin();
251 assert(offset >= 0, "Expecting non-negative offset!");
252 _asm_remarks.print(uint(offset), stream);
253 #endif
254 }
255
256 #ifndef PRODUCT
257 AsmRemarks &asm_remarks() { return _asm_remarks; }
258 DbgStrings &dbg_strings() { return _dbg_strings; }
259
260 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
261 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
262 #endif
263 };
264
265 //----------------------------------------------------------------------------------------------------
266 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
267
268 class RuntimeBlob : public CodeBlob {
269 friend class VMStructs;
270 public:
271
272 // Creation
273 // a) simple CodeBlob
274 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
275 : CodeBlob(name, kind, size, header_size)
276 {}
277
278 // b) full CodeBlob
279 // frame_complete is the offset from the beginning of the instructions
280 // to where the frame setup (from stackwalk viewpoint) is complete.
281 RuntimeBlob(
282 const char* name,
283 CodeBlobKind kind,
284 CodeBuffer* cb,
285 int size,
286 uint16_t header_size,
287 int16_t frame_complete,
288 int frame_size,
289 OopMapSet* oop_maps,
290 bool caller_must_gc_arguments = false
291 );
292
293 static void free(RuntimeBlob* blob);
294
295 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
296 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
297 };
298
299 class WhiteBox;
300 //----------------------------------------------------------------------------------------------------
301 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
302
303 class BufferBlob: public RuntimeBlob {
304 friend class VMStructs;
305 friend class AdapterBlob;
306 friend class VtableBlob;
307 friend class MethodHandlesAdapterBlob;
308 friend class BufferedInlineTypeBlob;
309 friend class UpcallStub;
310 friend class WhiteBox;
311
312 private:
313 // Creation support
314 BufferBlob(const char* name, CodeBlobKind kind, int size);
315 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int header_size);
316 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
317
318 void* operator new(size_t s, unsigned size) throw();
319
320 public:
321 // Creation
322 static BufferBlob* create(const char* name, uint buffer_size);
323 static BufferBlob* create(const char* name, CodeBuffer* cb);
324
325 static void free(BufferBlob* buf);
326
327 // Verification support
328 void verify() override;
329
330 void print_on(outputStream* st) const override;
331 void print_value_on(outputStream* st) const override;
332 };
333
334
335 //----------------------------------------------------------------------------------------------------
336 // AdapterBlob: used to hold C2I/I2C adapters
337
338 class AdapterBlob: public BufferBlob {
339 private:
340 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
341
342 public:
343 // Creation
344 static AdapterBlob* create(CodeBuffer* cb,
345 int frame_complete,
346 int frame_size,
347 OopMapSet* oop_maps,
348 bool caller_must_gc_arguments = false);
349
350 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
351 };
352
353 //---------------------------------------------------------------------------------------------------
354 class VtableBlob: public BufferBlob {
355 private:
356 VtableBlob(const char*, int);
357
358 void* operator new(size_t s, unsigned size) throw();
359
360 public:
361 // Creation
362 static VtableBlob* create(const char* name, int buffer_size);
363 };
364
365 //----------------------------------------------------------------------------------------------------
366 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
367
368 class MethodHandlesAdapterBlob: public BufferBlob {
369 private:
370 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MH_Adapter, size) {}
371
372 public:
373 // Creation
374 static MethodHandlesAdapterBlob* create(int buffer_size);
375 };
376
377 //----------------------------------------------------------------------------------------------------
378 // BufferedInlineTypeBlob : used for pack/unpack handlers
379
380 class BufferedInlineTypeBlob: public BufferBlob {
381 private:
382 const int _pack_fields_off;
383 const int _pack_fields_jobject_off;
384 const int _unpack_fields_off;
385
386 BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
387
388 public:
389 // Creation
390 static BufferedInlineTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
391
392 address pack_fields() const { return code_begin() + _pack_fields_off; }
393 address pack_fields_jobject() const { return code_begin() + _pack_fields_jobject_off; }
394 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
395 };
396
397 //----------------------------------------------------------------------------------------------------
398 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
399
400 class RuntimeStub: public RuntimeBlob {
401 friend class VMStructs;
402 private:
403 // Creation support
404 RuntimeStub(
405 const char* name,
406 CodeBuffer* cb,
407 int size,
408 int16_t frame_complete,
409 int frame_size,
410 OopMapSet* oop_maps,
411 bool caller_must_gc_arguments
412 );
413
414 void* operator new(size_t s, unsigned size) throw();
415
416 public:
417 // Creation
418 static RuntimeStub* new_runtime_stub(
419 const char* stub_name,
420 CodeBuffer* cb,
421 int16_t frame_complete,
422 int frame_size,
423 OopMapSet* oop_maps,
424 bool caller_must_gc_arguments,
425 bool alloc_fail_is_fatal=true
426 );
427
428 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
429
430 address entry_point() const { return code_begin(); }
431
432 // Verification support
433 void verify() override;
434
435 void print_on(outputStream* st) const override;
436 void print_value_on(outputStream* st) const override;
437 };
438
439
440 //----------------------------------------------------------------------------------------------------
441 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
442
443 class SingletonBlob: public RuntimeBlob {
444 friend class VMStructs;
445
446 protected:
447 void* operator new(size_t s, unsigned size) throw();
448
449 public:
450 SingletonBlob(
451 const char* name,
452 CodeBlobKind kind,
453 CodeBuffer* cb,
454 int size,
455 uint16_t header_size,
456 int frame_size,
457 OopMapSet* oop_maps
458 )
459 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
460 {};
461
462 address entry_point() { return code_begin(); }
463
464 // Verification support
465 void verify() override; // does nothing
466
467 void print_on(outputStream* st) const override;
468 void print_value_on(outputStream* st) const override;
469 };
470
471
472 //----------------------------------------------------------------------------------------------------
473 // DeoptimizationBlob
474
475 class DeoptimizationBlob: public SingletonBlob {
476 friend class VMStructs;
477 friend class JVMCIVMStructs;
478 private:
479 int _unpack_offset;
480 int _unpack_with_exception;
481 int _unpack_with_reexecution;
482
483 int _unpack_with_exception_in_tls;
484
485 #if INCLUDE_JVMCI
486 // Offsets when JVMCI calls uncommon_trap.
487 int _uncommon_trap_offset;
488 int _implicit_exception_uncommon_trap_offset;
489 #endif
490
491 // Creation support
492 DeoptimizationBlob(
493 CodeBuffer* cb,
494 int size,
495 OopMapSet* oop_maps,
496 int unpack_offset,
497 int unpack_with_exception_offset,
498 int unpack_with_reexecution_offset,
499 int frame_size
500 );
501
502 public:
503 // Creation
504 static DeoptimizationBlob* create(
505 CodeBuffer* cb,
506 OopMapSet* oop_maps,
507 int unpack_offset,
508 int unpack_with_exception_offset,
509 int unpack_with_reexecution_offset,
510 int frame_size
511 );
512
513 // Printing
514 void print_value_on(outputStream* st) const override;
515
516 address unpack() const { return code_begin() + _unpack_offset; }
517 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
518 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
519
520 // Alternate entry point for C1 where the exception and issuing pc
521 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
522 // instead of being in registers. This is needed because C1 doesn't
523 // model exception paths in a way that keeps these registers free so
524 // there may be live values in those registers during deopt.
525 void set_unpack_with_exception_in_tls_offset(int offset) {
526 _unpack_with_exception_in_tls = offset;
527 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
528 }
529 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
530
531 #if INCLUDE_JVMCI
532 // Offsets when JVMCI calls uncommon_trap.
533 void set_uncommon_trap_offset(int offset) {
534 _uncommon_trap_offset = offset;
535 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
536 }
537 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
538
539 void set_implicit_exception_uncommon_trap_offset(int offset) {
540 _implicit_exception_uncommon_trap_offset = offset;
541 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
542 }
543 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
544 #endif // INCLUDE_JVMCI
545 };
546
547
548 //----------------------------------------------------------------------------------------------------
549 // UncommonTrapBlob (currently only used by Compiler 2)
550
551 #ifdef COMPILER2
552
553 class UncommonTrapBlob: public SingletonBlob {
554 friend class VMStructs;
555 private:
556 // Creation support
557 UncommonTrapBlob(
558 CodeBuffer* cb,
559 int size,
560 OopMapSet* oop_maps,
561 int frame_size
562 );
563
564 public:
565 // Creation
566 static UncommonTrapBlob* create(
567 CodeBuffer* cb,
568 OopMapSet* oop_maps,
569 int frame_size
570 );
571 };
572
573
574 //----------------------------------------------------------------------------------------------------
575 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
576
577 class ExceptionBlob: public SingletonBlob {
578 friend class VMStructs;
579 private:
580 // Creation support
581 ExceptionBlob(
582 CodeBuffer* cb,
583 int size,
584 OopMapSet* oop_maps,
585 int frame_size
586 );
587
588 public:
589 // Creation
590 static ExceptionBlob* create(
591 CodeBuffer* cb,
592 OopMapSet* oop_maps,
593 int frame_size
594 );
595 };
596 #endif // COMPILER2
597
598
599 //----------------------------------------------------------------------------------------------------
600 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
601
602 class SafepointBlob: public SingletonBlob {
603 friend class VMStructs;
604 private:
605 // Creation support
606 SafepointBlob(
607 CodeBuffer* cb,
608 int size,
609 OopMapSet* oop_maps,
610 int frame_size
611 );
612
613 public:
614 // Creation
615 static SafepointBlob* create(
616 CodeBuffer* cb,
617 OopMapSet* oop_maps,
618 int frame_size
619 );
620 };
621
622 //----------------------------------------------------------------------------------------------------
623
624 class UpcallLinker;
625
626 // A (Panama) upcall stub. Not used by JNI.
627 class UpcallStub: public RuntimeBlob {
628 friend class VMStructs;
629 friend class UpcallLinker;
630 private:
631 jobject _receiver;
632 ByteSize _frame_data_offset;
633
634 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
635
636 void* operator new(size_t s, unsigned size) throw();
637
638 struct FrameData {
639 JavaFrameAnchor jfa;
640 JavaThread* thread;
641 JNIHandleBlock* old_handles;
642 JNIHandleBlock* new_handles;
643 };
644
645 // defined in frame_ARCH.cpp
646 FrameData* frame_data_for_frame(const frame& frame) const;
647 public:
648 // Creation
649 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
650
651 static void free(UpcallStub* blob);
652
653 jobject receiver() { return _receiver; }
654
655 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
656
657 // GC/Verification support
658 void oops_do(OopClosure* f, const frame& frame);
659 void verify() override;
660
661 // Misc.
662 void print_on(outputStream* st) const override;
663 void print_value_on(outputStream* st) const override;
664 };
665
666 #endif // SHARE_CODE_CODEBLOB_HPP