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 in the CodeCache:
71 // - header
72 // - content space
73 // - instruction space
74 // Outside of the CodeCache:
75 // - mutable_data
76 // - relocation info
77 // - additional data for subclasses
78
79 enum class CodeBlobKind : u1 {
80 None,
81 Nmethod,
82 Buffer,
83 Adapter,
84 Vtable,
85 MHAdapter,
86 RuntimeStub,
87 Deoptimization,
88 Safepoint,
89 #ifdef COMPILER2
90 Exception,
91 UncommonTrap,
92 #endif
93 Upcall,
94 Number_Of_Kinds
95 };
96
97 class UpcallStub; // for as_upcall_stub()
98 class RuntimeStub; // for as_runtime_stub()
99 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
100
101 class CodeBlob {
102 friend class VMStructs;
103 friend class JVMCIVMStructs;
104
105 protected:
106 // order fields from large to small to minimize padding between fields
107 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
108 const char* _name;
109 address _mutable_data;
110
111 int _size; // total size of CodeBlob in bytes
112 int _relocation_size; // size of relocation (could be bigger than 64Kb)
113 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
114 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
115 int _data_offset; // offset to where data region begins
116 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
117 int _mutable_data_size;
118
119 S390_ONLY(int _ctable_offset;)
120
121 uint16_t _header_size; // size of header (depends on subclass)
122 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
123 // not finished setting up their frame. Beware of pc's in
124 // that range. There is a similar range(s) on returns
125 // which we don't detect.
126
127 CodeBlobKind _kind; // Kind of this code blob
128
129 bool _caller_must_gc_arguments;
130
131 #ifndef PRODUCT
132 AsmRemarks _asm_remarks;
133 DbgStrings _dbg_strings;
134 #endif
135
136 void print_on_impl(outputStream* st) const;
137 void print_value_on_impl(outputStream* st) const;
138
139 class Vptr {
140 public:
141 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
142 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
143 };
144
145 const Vptr* vptr() const;
146
147 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
148 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
149 int mutable_data_size);
150
151 // Simple CodeBlob used for simple BufferBlob.
152 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
153
154 void operator delete(void* p) { }
155
156 public:
157
158 ~CodeBlob() {
159 assert(_oop_maps == nullptr, "Not flushed");
160 }
161
162 // Returns the space needed for CodeBlob
163 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
164 static unsigned int align_code_offset(int offset);
165
166 // Deletion
167 void purge();
168
169 // Typing
170 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
171 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
172 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
173 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
174 #ifdef COMPILER2
175 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
176 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
177 #else
178 bool is_uncommon_trap_stub() const { return false; }
179 bool is_exception_stub() const { return false; }
180 #endif
181 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
182 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
183 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
184 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
185 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
186
187 // Casting
188 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
189 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
190 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
191 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
192 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
193
194 // Boundaries
195 address header_begin() const { return (address) this; }
196 address header_end() const { return ((address) this) + _header_size; }
197 address content_begin() const { return (address) header_begin() + _content_offset; }
198 address content_end() const { return (address) header_begin() + _data_offset; }
199 address code_begin() const { return (address) header_begin() + _code_offset; }
200 address code_end() const { return (address) header_begin() + _data_offset; }
201 address data_begin() const { return (address) header_begin() + _data_offset; }
202 address data_end() const { return (address) header_begin() + _size; }
203 address blob_end() const { return (address) header_begin() + _size; }
204 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
205
206 int mutable_data_size() const { return _mutable_data_size; }
207 address mutable_data_begin() const { return _mutable_data; }
208 address mutable_data_end() const { return _mutable_data + _mutable_data_size; }
209
210 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; }
211 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); }
212
213 // Offsets
214 int content_offset() const { return _content_offset; }
215 int code_offset() const { return _code_offset; }
216
217 // This field holds the beginning of the const section in the old code buffer.
218 // It is needed to fix relocations of pc-relative loads when resizing the
219 // the constant pool or moving it.
220 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
221 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
222
223 // Sizes
224 int size() const { return _size; }
225 int header_size() const { return _header_size; }
226 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
227 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
228 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
229
230 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
231 void adjust_size(size_t used) {
232 _size = (int)used;
233 _data_offset = _size;
234 }
235
236 // Containment
237 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); }
238 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
239 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
240 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
241 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
242 int frame_complete_offset() const { return _frame_complete_offset; }
243
244 // OopMap for frame
245 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
246 void set_oop_maps(OopMapSet* p);
247
248 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
249 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
250
251 // Frame support. Sizes are in word units.
252 int frame_size() const { return _frame_size; }
253 void set_frame_size(int size) { _frame_size = size; }
254
255 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
256 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
257
258 // Naming
259 const char* name() const { return _name; }
260 void set_name(const char* name) { _name = name; }
261
262 // Debugging
263 void verify();
264 void print() const;
265 void print_on(outputStream* st) const;
266 void print_value_on(outputStream* st) const;
267
268 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
269 void print_code_on(outputStream* st);
270
271 // Print to stream, any comments associated with offset.
272 void print_block_comment(outputStream* stream, address block_begin) const;
273
274 #ifndef PRODUCT
275 AsmRemarks &asm_remarks() { return _asm_remarks; }
276 DbgStrings &dbg_strings() { return _dbg_strings; }
277
278 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
279 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
280 #endif
281 };
282
283 //----------------------------------------------------------------------------------------------------
284 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
285
286 class RuntimeBlob : public CodeBlob {
287 friend class VMStructs;
288 public:
289
290 // Creation
291 // a) simple CodeBlob
292 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
293 : CodeBlob(name, kind, size, header_size)
294 {}
295
296 // b) full CodeBlob
297 // frame_complete is the offset from the beginning of the instructions
298 // to where the frame setup (from stackwalk viewpoint) is complete.
299 RuntimeBlob(
300 const char* name,
301 CodeBlobKind kind,
302 CodeBuffer* cb,
303 int size,
304 uint16_t header_size,
305 int16_t frame_complete,
306 int frame_size,
307 OopMapSet* oop_maps,
308 bool caller_must_gc_arguments = false
309 );
310
311 static void free(RuntimeBlob* blob);
312
313 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
314 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
315
316 class Vptr : public CodeBlob::Vptr {
317 };
318 };
319
320 class WhiteBox;
321 //----------------------------------------------------------------------------------------------------
322 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
323
324 class BufferBlob: public RuntimeBlob {
325 friend class VMStructs;
326 friend class AdapterBlob;
327 friend class VtableBlob;
328 friend class MethodHandlesAdapterBlob;
329 friend class UpcallStub;
330 friend class WhiteBox;
331
332 private:
333 // Creation support
334 BufferBlob(const char* name, CodeBlobKind kind, int size);
335 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size);
336
337 void* operator new(size_t s, unsigned size) throw();
338
339 public:
340 // Creation
341 static BufferBlob* create(const char* name, uint buffer_size);
342 static BufferBlob* create(const char* name, CodeBuffer* cb);
343
344 static void free(BufferBlob* buf);
345
346 void print_on_impl(outputStream* st) const;
347 void print_value_on_impl(outputStream* st) const;
348
349 class Vptr : public RuntimeBlob::Vptr {
350 void print_on(const CodeBlob* instance, outputStream* st) const override {
351 ((const BufferBlob*)instance)->print_on_impl(st);
352 }
353 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
354 ((const BufferBlob*)instance)->print_value_on_impl(st);
355 }
356 };
357
358 static const Vptr _vpntr;
359 };
360
361
362 //----------------------------------------------------------------------------------------------------
363 // AdapterBlob: used to hold C2I/I2C adapters
364
365 class AdapterBlob: public BufferBlob {
366 private:
367 AdapterBlob(int size, CodeBuffer* cb);
368
369 public:
370 // Creation
371 static AdapterBlob* create(CodeBuffer* cb);
372 };
373
374 //---------------------------------------------------------------------------------------------------
375 class VtableBlob: public BufferBlob {
376 private:
377 VtableBlob(const char*, int);
378
379 void* operator new(size_t s, unsigned size) throw();
380
381 public:
382 // Creation
383 static VtableBlob* create(const char* name, int buffer_size);
384 };
385
386 //----------------------------------------------------------------------------------------------------
387 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
388
389 class MethodHandlesAdapterBlob: public BufferBlob {
390 private:
391 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
392
393 public:
394 // Creation
395 static MethodHandlesAdapterBlob* create(int buffer_size);
396 };
397
398
399 //----------------------------------------------------------------------------------------------------
400 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
401
402 class RuntimeStub: public RuntimeBlob {
403 friend class VMStructs;
404 private:
405 // Creation support
406 RuntimeStub(
407 const char* name,
408 CodeBuffer* cb,
409 int size,
410 int16_t frame_complete,
411 int frame_size,
412 OopMapSet* oop_maps,
413 bool caller_must_gc_arguments
414 );
415
416 void* operator new(size_t s, unsigned size) throw();
417
418 public:
419 // Creation
420 static RuntimeStub* new_runtime_stub(
421 const char* stub_name,
422 CodeBuffer* cb,
423 int16_t frame_complete,
424 int frame_size,
425 OopMapSet* oop_maps,
426 bool caller_must_gc_arguments,
427 bool alloc_fail_is_fatal=true
428 );
429
430 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
431
432 address entry_point() const { return code_begin(); }
433
434 void print_on_impl(outputStream* st) const;
435 void print_value_on_impl(outputStream* st) const;
436
437 class Vptr : public RuntimeBlob::Vptr {
438 void print_on(const CodeBlob* instance, outputStream* st) const override {
439 instance->as_runtime_stub()->print_on_impl(st);
440 }
441 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
442 instance->as_runtime_stub()->print_value_on_impl(st);
443 }
444 };
445
446 static const Vptr _vpntr;
447 };
448
449
450 //----------------------------------------------------------------------------------------------------
451 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
452
453 class SingletonBlob: public RuntimeBlob {
454 friend class VMStructs;
455
456 protected:
457 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
458
459 public:
460 SingletonBlob(
461 const char* name,
462 CodeBlobKind kind,
463 CodeBuffer* cb,
464 int size,
465 uint16_t header_size,
466 int frame_size,
467 OopMapSet* oop_maps
468 )
469 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
470 {};
471
472 address entry_point() { return code_begin(); }
473
474 void print_on_impl(outputStream* st) const;
475 void print_value_on_impl(outputStream* st) const;
476
477 class Vptr : public RuntimeBlob::Vptr {
478 void print_on(const CodeBlob* instance, outputStream* st) const override {
479 ((const SingletonBlob*)instance)->print_on_impl(st);
480 }
481 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
482 ((const SingletonBlob*)instance)->print_value_on_impl(st);
483 }
484 };
485
486 static const Vptr _vpntr;
487 };
488
489
490 //----------------------------------------------------------------------------------------------------
491 // DeoptimizationBlob
492
493 class DeoptimizationBlob: public SingletonBlob {
494 friend class VMStructs;
495 friend class JVMCIVMStructs;
496 private:
497 int _unpack_offset;
498 int _unpack_with_exception;
499 int _unpack_with_reexecution;
500
501 int _unpack_with_exception_in_tls;
502
503 #if INCLUDE_JVMCI
504 // Offsets when JVMCI calls uncommon_trap.
505 int _uncommon_trap_offset;
506 int _implicit_exception_uncommon_trap_offset;
507 #endif
508
509 // Creation support
510 DeoptimizationBlob(
511 CodeBuffer* cb,
512 int size,
513 OopMapSet* oop_maps,
514 int unpack_offset,
515 int unpack_with_exception_offset,
516 int unpack_with_reexecution_offset,
517 int frame_size
518 );
519
520 public:
521 // Creation
522 static DeoptimizationBlob* create(
523 CodeBuffer* cb,
524 OopMapSet* oop_maps,
525 int unpack_offset,
526 int unpack_with_exception_offset,
527 int unpack_with_reexecution_offset,
528 int frame_size
529 );
530
531 address unpack() const { return code_begin() + _unpack_offset; }
532 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
533 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
534
535 // Alternate entry point for C1 where the exception and issuing pc
536 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
537 // instead of being in registers. This is needed because C1 doesn't
538 // model exception paths in a way that keeps these registers free so
539 // there may be live values in those registers during deopt.
540 void set_unpack_with_exception_in_tls_offset(int offset) {
541 _unpack_with_exception_in_tls = offset;
542 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
543 }
544 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
545
546 #if INCLUDE_JVMCI
547 // Offsets when JVMCI calls uncommon_trap.
548 void set_uncommon_trap_offset(int offset) {
549 _uncommon_trap_offset = offset;
550 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
551 }
552 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
553
554 void set_implicit_exception_uncommon_trap_offset(int offset) {
555 _implicit_exception_uncommon_trap_offset = offset;
556 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
557 }
558 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
559 #endif // INCLUDE_JVMCI
560
561 void print_value_on_impl(outputStream* st) const;
562
563 class Vptr : public SingletonBlob::Vptr {
564 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
565 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
566 }
567 };
568
569 static const Vptr _vpntr;
570 };
571
572
573 //----------------------------------------------------------------------------------------------------
574 // UncommonTrapBlob (currently only used by Compiler 2)
575
576 #ifdef COMPILER2
577
578 class UncommonTrapBlob: public SingletonBlob {
579 friend class VMStructs;
580 private:
581 // Creation support
582 UncommonTrapBlob(
583 CodeBuffer* cb,
584 int size,
585 OopMapSet* oop_maps,
586 int frame_size
587 );
588
589 public:
590 // Creation
591 static UncommonTrapBlob* create(
592 CodeBuffer* cb,
593 OopMapSet* oop_maps,
594 int frame_size
595 );
596 };
597
598
599 //----------------------------------------------------------------------------------------------------
600 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
601
602 class ExceptionBlob: public SingletonBlob {
603 friend class VMStructs;
604 private:
605 // Creation support
606 ExceptionBlob(
607 CodeBuffer* cb,
608 int size,
609 OopMapSet* oop_maps,
610 int frame_size
611 );
612
613 public:
614 // Creation
615 static ExceptionBlob* create(
616 CodeBuffer* cb,
617 OopMapSet* oop_maps,
618 int frame_size
619 );
620 };
621 #endif // COMPILER2
622
623
624 //----------------------------------------------------------------------------------------------------
625 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
626
627 class SafepointBlob: public SingletonBlob {
628 friend class VMStructs;
629 private:
630 // Creation support
631 SafepointBlob(
632 CodeBuffer* cb,
633 int size,
634 OopMapSet* oop_maps,
635 int frame_size
636 );
637
638 public:
639 // Creation
640 static SafepointBlob* create(
641 CodeBuffer* cb,
642 OopMapSet* oop_maps,
643 int frame_size
644 );
645 };
646
647 //----------------------------------------------------------------------------------------------------
648
649 class UpcallLinker;
650
651 // A (Panama) upcall stub. Not used by JNI.
652 class UpcallStub: public RuntimeBlob {
653 friend class VMStructs;
654 friend class UpcallLinker;
655 private:
656 jobject _receiver;
657 ByteSize _frame_data_offset;
658
659 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
660
661 void* operator new(size_t s, unsigned size) throw();
662
663 struct FrameData {
664 JavaFrameAnchor jfa;
665 JavaThread* thread;
666 JNIHandleBlock* old_handles;
667 JNIHandleBlock* new_handles;
668 };
669
670 // defined in frame_ARCH.cpp
671 FrameData* frame_data_for_frame(const frame& frame) const;
672 public:
673 // Creation
674 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
675
676 static void free(UpcallStub* blob);
677
678 jobject receiver() { return _receiver; }
679
680 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
681
682 // GC support
683 void oops_do(OopClosure* f, const frame& frame);
684
685 void print_on_impl(outputStream* st) const;
686 void print_value_on_impl(outputStream* st) const;
687
688 class Vptr : public RuntimeBlob::Vptr {
689 void print_on(const CodeBlob* instance, outputStream* st) const override {
690 instance->as_upcall_stub()->print_on_impl(st);
691 }
692 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
693 instance->as_upcall_stub()->print_value_on_impl(st);
694 }
695 };
696
697 static const Vptr _vpntr;
698 };
699
700 #endif // SHARE_CODE_CODEBLOB_HPP