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 "code/SCCache.hpp"
30 #include "compiler/compilerDefinitions.hpp"
31 #include "compiler/oopMap.hpp"
32 #include "runtime/javaFrameAnchor.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/handles.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/macros.hpp"
37
38 class ImmutableOopMap;
39 class ImmutableOopMapSet;
40 class JNIHandleBlock;
41 class OopMapSet;
42
43 // CodeBlob Types
44 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
45 enum class CodeBlobType {
46 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
47 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
48 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
49 All = 3, // All types (No code cache segmentation)
50 NumTypes = 4 // Number of CodeBlobTypes
51 };
52
53 // CodeBlob - superclass for all entries in the CodeCache.
54 //
55 // Subtypes are:
56 // nmethod : JIT Compiled Java methods
57 // RuntimeBlob : Non-compiled method code; generated glue code
58 // BufferBlob : Used for non-relocatable code such as interpreter, stubroutines, etc.
59 // AdapterBlob : Used to hold C2I/I2C adapters
60 // VtableBlob : Used for holding vtable chunks
61 // MethodHandlesAdapterBlob : Used to hold MethodHandles adapters
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 // SafepointBlob : Used to handle illegal instruction exceptions
66 // ExceptionBlob : Used for stack unrolling
67 // UncommonTrapBlob : Used to handle uncommon traps
68 // UpcallStub : Used for upcalls from native code
69 //
70 //
71 // Layout in the CodeCache:
72 // - header
73 // - content space
74 // - instruction space
75 // Outside of the CodeCache:
76 // - mutable_data
77 // - relocation info
78 // - additional data for subclasses
79
80 enum class CodeBlobKind : u1 {
81 None,
82 Nmethod,
83 Buffer,
84 Adapter,
85 Vtable,
86 MHAdapter,
87 RuntimeStub,
88 Deoptimization,
89 Safepoint,
90 #ifdef COMPILER2
91 Exception,
92 UncommonTrap,
93 #endif
94 Upcall,
95 Number_Of_Kinds
96 };
97
98 class UpcallStub; // for as_upcall_stub()
99 class RuntimeStub; // for as_runtime_stub()
100 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
101
102 class CodeBlob {
103 friend class VMStructs;
104 friend class JVMCIVMStructs;
105
106 protected:
107 // order fields from large to small to minimize padding between fields
108 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
109 const char* _name;
110 address _mutable_data;
111
112 int _size; // total size of CodeBlob in bytes
113 int _relocation_size; // size of relocation (could be bigger than 64Kb)
114 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
115 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
116 int _data_offset; // offset to where data region begins
117 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
118 int _mutable_data_size;
119
120 S390_ONLY(int _ctable_offset;)
121
122 uint16_t _header_size; // size of header (depends on subclass)
123 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
124 // not finished setting up their frame. Beware of pc's in
125 // that range. There is a similar range(s) on returns
126 // which we don't detect.
127
128 CodeBlobKind _kind; // Kind of this code blob
129
130 bool _caller_must_gc_arguments;
131
132 #ifndef PRODUCT
133 AsmRemarks _asm_remarks;
134 DbgStrings _dbg_strings;
135 #endif
136
137 void print_on_impl(outputStream* st) const;
138 void print_value_on_impl(outputStream* st) const;
139
140 class Vptr {
141 public:
142 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
143 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
144 };
145
146 const Vptr* vptr() const;
147
148 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
149 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
150 int mutable_data_size);
151
152 // Simple CodeBlob used for simple BufferBlob.
153 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
154
155 void operator delete(void* p) { }
156
157 public:
158
159 ~CodeBlob() {
160 assert(_oop_maps == nullptr || SCCache::is_address_in_aot_cache((address)_oop_maps), "Not flushed");
161 }
162
163 // Returns the space needed for CodeBlob
164 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
165 static unsigned int align_code_offset(int offset);
166
167 // Deletion
168 void purge();
169
170 // Typing
171 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
172 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
173 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
174 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
175 #ifdef COMPILER2
176 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
177 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
178 #else
179 bool is_uncommon_trap_stub() const { return false; }
180 bool is_exception_stub() const { return false; }
181 #endif
182 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
183 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
184 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
185 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
186 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
187
188 // Casting
189 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
190 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
191 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
192 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
193 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
194
195 // Boundaries
196 address header_begin() const { return (address) this; }
197 address header_end() const { return ((address) this) + _header_size; }
198 address content_begin() const { return (address) header_begin() + _content_offset; }
199 address content_end() const { return (address) header_begin() + _data_offset; }
200 address code_begin() const { return (address) header_begin() + _code_offset; }
201 address code_end() const { return (address) header_begin() + _data_offset; }
202 address data_begin() const { return (address) header_begin() + _data_offset; }
203 address data_end() const { return (address) header_begin() + _size; }
204 address blob_end() const { return (address) header_begin() + _size; }
205 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
206
207 int mutable_data_size() const { return _mutable_data_size; }
208 address mutable_data_begin() const { return _mutable_data; }
209 address mutable_data_end() const { return _mutable_data + _mutable_data_size; }
210
211 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; }
212 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); }
213
214 // Offsets
215 int content_offset() const { return _content_offset; }
216 int code_offset() const { return _code_offset; }
217
218 // This field holds the beginning of the const section in the old code buffer.
219 // It is needed to fix relocations of pc-relative loads when resizing the
220 // the constant pool or moving it.
221 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
222 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
223
224 // Sizes
225 int size() const { return _size; }
226 int header_size() const { return _header_size; }
227 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
228 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
229 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
230
231 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
232 void adjust_size(size_t used) {
233 _size = (int)used;
234 _data_offset = _size;
235 }
236
237 // Containment
238 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); }
239 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
240 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
241 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
242 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
243 int frame_complete_offset() const { return _frame_complete_offset; }
244
245 // OopMap for frame
246 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
247 void set_oop_maps(OopMapSet* p);
248 void set_oop_maps(ImmutableOopMapSet* p) { _oop_maps = p; }
249
250 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
251 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
252
253 // Frame support. Sizes are in word units.
254 int frame_size() const { return _frame_size; }
255 void set_frame_size(int size) { _frame_size = size; }
256
257 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
258 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
259
260 // Naming
261 const char* name() const { return _name; }
262 void set_name(const char* name) { _name = name; }
263
264 // Debugging
265 void verify();
266 void print() const;
267 void print_on(outputStream* st) const;
268 void print_value_on(outputStream* st) const;
269
270 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
271 void print_code_on(outputStream* st);
272
273 // Print to stream, any comments associated with offset.
274 void print_block_comment(outputStream* stream, address block_begin) const;
275
276 #ifndef PRODUCT
277 AsmRemarks &asm_remarks() { return _asm_remarks; }
278 DbgStrings &dbg_strings() { return _dbg_strings; }
279
280 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
281 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
282 #endif
283
284 void prepare_for_archiving();
285 };
286
287 //----------------------------------------------------------------------------------------------------
288 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
289
290 class RuntimeBlob : public CodeBlob {
291 friend class VMStructs;
292 public:
293
294 // Creation
295 // a) simple CodeBlob
296 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
297 : CodeBlob(name, kind, size, header_size)
298 {}
299
300 // b) full CodeBlob
301 // frame_complete is the offset from the beginning of the instructions
302 // to where the frame setup (from stackwalk viewpoint) is complete.
303 RuntimeBlob(
304 const char* name,
305 CodeBlobKind kind,
306 CodeBuffer* cb,
307 int size,
308 uint16_t header_size,
309 int16_t frame_complete,
310 int frame_size,
311 OopMapSet* oop_maps,
312 bool caller_must_gc_arguments = false
313 );
314
315 static void free(RuntimeBlob* blob);
316
317 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
318 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
319
320 class Vptr : public CodeBlob::Vptr {
321 };
322 };
323
324 class WhiteBox;
325 //----------------------------------------------------------------------------------------------------
326 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
327
328 class BufferBlob: public RuntimeBlob {
329 friend class VMStructs;
330 friend class AdapterBlob;
331 friend class VtableBlob;
332 friend class MethodHandlesAdapterBlob;
333 friend class UpcallStub;
334 friend class WhiteBox;
335
336 private:
337 // Creation support
338 BufferBlob(const char* name, CodeBlobKind kind, int size);
339 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size);
340
341 void* operator new(size_t s, unsigned size) throw();
342
343 public:
344 // Creation
345 static BufferBlob* create(const char* name, uint buffer_size);
346 static BufferBlob* create(const char* name, CodeBuffer* cb);
347
348 static void free(BufferBlob* buf);
349
350 void print_on_impl(outputStream* st) const;
351 void print_value_on_impl(outputStream* st) const;
352
353 class Vptr : public RuntimeBlob::Vptr {
354 void print_on(const CodeBlob* instance, outputStream* st) const override {
355 ((const BufferBlob*)instance)->print_on_impl(st);
356 }
357 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
358 ((const BufferBlob*)instance)->print_value_on_impl(st);
359 }
360 };
361
362 static const Vptr _vpntr;
363 };
364
365
366 //----------------------------------------------------------------------------------------------------
367 // AdapterBlob: used to hold C2I/I2C adapters
368
369 class AdapterBlob: public BufferBlob {
370 private:
371 AdapterBlob(int size, CodeBuffer* cb);
372
373 public:
374 // Creation
375 static AdapterBlob* create(CodeBuffer* cb);
376 };
377
378 //---------------------------------------------------------------------------------------------------
379 class VtableBlob: public BufferBlob {
380 private:
381 VtableBlob(const char*, int);
382
383 void* operator new(size_t s, unsigned size) throw();
384
385 public:
386 // Creation
387 static VtableBlob* create(const char* name, int buffer_size);
388 };
389
390 //----------------------------------------------------------------------------------------------------
391 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
392
393 class MethodHandlesAdapterBlob: public BufferBlob {
394 private:
395 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
396
397 public:
398 // Creation
399 static MethodHandlesAdapterBlob* create(int buffer_size);
400 };
401
402
403 //----------------------------------------------------------------------------------------------------
404 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
405
406 class RuntimeStub: public RuntimeBlob {
407 friend class VMStructs;
408 private:
409 // Creation support
410 RuntimeStub(
411 const char* name,
412 CodeBuffer* cb,
413 int size,
414 int16_t frame_complete,
415 int frame_size,
416 OopMapSet* oop_maps,
417 bool caller_must_gc_arguments
418 );
419
420 void* operator new(size_t s, unsigned size) throw();
421
422 public:
423 // Creation
424 static RuntimeStub* new_runtime_stub(
425 const char* stub_name,
426 CodeBuffer* cb,
427 int16_t frame_complete,
428 int frame_size,
429 OopMapSet* oop_maps,
430 bool caller_must_gc_arguments,
431 bool alloc_fail_is_fatal=true
432 );
433
434 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
435
436 address entry_point() const { return code_begin(); }
437
438 void print_on_impl(outputStream* st) const;
439 void print_value_on_impl(outputStream* st) const;
440
441 class Vptr : public RuntimeBlob::Vptr {
442 void print_on(const CodeBlob* instance, outputStream* st) const override {
443 instance->as_runtime_stub()->print_on_impl(st);
444 }
445 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
446 instance->as_runtime_stub()->print_value_on_impl(st);
447 }
448 };
449
450 static const Vptr _vpntr;
451 };
452
453
454 //----------------------------------------------------------------------------------------------------
455 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
456
457 class SingletonBlob: public RuntimeBlob {
458 friend class VMStructs;
459
460 protected:
461 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
462
463 public:
464 SingletonBlob(
465 const char* name,
466 CodeBlobKind kind,
467 CodeBuffer* cb,
468 int size,
469 uint16_t header_size,
470 int frame_size,
471 OopMapSet* oop_maps
472 )
473 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
474 {};
475
476 address entry_point() { return code_begin(); }
477
478 void print_on_impl(outputStream* st) const;
479 void print_value_on_impl(outputStream* st) const;
480
481 class Vptr : public RuntimeBlob::Vptr {
482 void print_on(const CodeBlob* instance, outputStream* st) const override {
483 ((const SingletonBlob*)instance)->print_on_impl(st);
484 }
485 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
486 ((const SingletonBlob*)instance)->print_value_on_impl(st);
487 }
488 };
489
490 static const Vptr _vpntr;
491 };
492
493
494 //----------------------------------------------------------------------------------------------------
495 // DeoptimizationBlob
496
497 class DeoptimizationBlob: public SingletonBlob {
498 friend class VMStructs;
499 friend class JVMCIVMStructs;
500 private:
501 int _unpack_offset;
502 int _unpack_with_exception;
503 int _unpack_with_reexecution;
504
505 int _unpack_with_exception_in_tls;
506
507 #if INCLUDE_JVMCI
508 // Offsets when JVMCI calls uncommon_trap.
509 int _uncommon_trap_offset;
510 int _implicit_exception_uncommon_trap_offset;
511 #endif
512
513 // Creation support
514 DeoptimizationBlob(
515 CodeBuffer* cb,
516 int size,
517 OopMapSet* oop_maps,
518 int unpack_offset,
519 int unpack_with_exception_offset,
520 int unpack_with_reexecution_offset,
521 int frame_size
522 );
523
524 public:
525 // Creation
526 static DeoptimizationBlob* create(
527 CodeBuffer* cb,
528 OopMapSet* oop_maps,
529 int unpack_offset,
530 int unpack_with_exception_offset,
531 int unpack_with_reexecution_offset,
532 int frame_size
533 );
534
535 address unpack() const { return code_begin() + _unpack_offset; }
536 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
537 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
538
539 // Alternate entry point for C1 where the exception and issuing pc
540 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
541 // instead of being in registers. This is needed because C1 doesn't
542 // model exception paths in a way that keeps these registers free so
543 // there may be live values in those registers during deopt.
544 void set_unpack_with_exception_in_tls_offset(int offset) {
545 _unpack_with_exception_in_tls = offset;
546 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
547 }
548 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
549
550 #if INCLUDE_JVMCI
551 // Offsets when JVMCI calls uncommon_trap.
552 void set_uncommon_trap_offset(int offset) {
553 _uncommon_trap_offset = offset;
554 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
555 }
556 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
557
558 void set_implicit_exception_uncommon_trap_offset(int offset) {
559 _implicit_exception_uncommon_trap_offset = offset;
560 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
561 }
562 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
563 #endif // INCLUDE_JVMCI
564
565 void print_value_on_impl(outputStream* st) const;
566
567 class Vptr : public SingletonBlob::Vptr {
568 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
569 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
570 }
571 };
572
573 static const Vptr _vpntr;
574 };
575
576
577 //----------------------------------------------------------------------------------------------------
578 // UncommonTrapBlob (currently only used by Compiler 2)
579
580 #ifdef COMPILER2
581
582 class UncommonTrapBlob: public SingletonBlob {
583 friend class VMStructs;
584 private:
585 // Creation support
586 UncommonTrapBlob(
587 CodeBuffer* cb,
588 int size,
589 OopMapSet* oop_maps,
590 int frame_size
591 );
592
593 public:
594 // Creation
595 static UncommonTrapBlob* create(
596 CodeBuffer* cb,
597 OopMapSet* oop_maps,
598 int frame_size
599 );
600 };
601
602
603 //----------------------------------------------------------------------------------------------------
604 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
605
606 class ExceptionBlob: public SingletonBlob {
607 friend class VMStructs;
608 private:
609 // Creation support
610 ExceptionBlob(
611 CodeBuffer* cb,
612 int size,
613 OopMapSet* oop_maps,
614 int frame_size
615 );
616
617 public:
618 // Creation
619 static ExceptionBlob* create(
620 CodeBuffer* cb,
621 OopMapSet* oop_maps,
622 int frame_size
623 );
624 };
625 #endif // COMPILER2
626
627
628 //----------------------------------------------------------------------------------------------------
629 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
630
631 class SafepointBlob: public SingletonBlob {
632 friend class VMStructs;
633 private:
634 // Creation support
635 SafepointBlob(
636 CodeBuffer* cb,
637 int size,
638 OopMapSet* oop_maps,
639 int frame_size
640 );
641
642 public:
643 // Creation
644 static SafepointBlob* create(
645 CodeBuffer* cb,
646 OopMapSet* oop_maps,
647 int frame_size
648 );
649 };
650
651 //----------------------------------------------------------------------------------------------------
652
653 class UpcallLinker;
654
655 // A (Panama) upcall stub. Not used by JNI.
656 class UpcallStub: public RuntimeBlob {
657 friend class VMStructs;
658 friend class UpcallLinker;
659 private:
660 jobject _receiver;
661 ByteSize _frame_data_offset;
662
663 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
664
665 void* operator new(size_t s, unsigned size) throw();
666
667 struct FrameData {
668 JavaFrameAnchor jfa;
669 JavaThread* thread;
670 JNIHandleBlock* old_handles;
671 JNIHandleBlock* new_handles;
672 };
673
674 // defined in frame_ARCH.cpp
675 FrameData* frame_data_for_frame(const frame& frame) const;
676 public:
677 // Creation
678 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
679
680 static void free(UpcallStub* blob);
681
682 jobject receiver() { return _receiver; }
683
684 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
685
686 // GC support
687 void oops_do(OopClosure* f, const frame& frame);
688
689 void print_on_impl(outputStream* st) const;
690 void print_value_on_impl(outputStream* st) const;
691
692 class Vptr : public RuntimeBlob::Vptr {
693 void print_on(const CodeBlob* instance, outputStream* st) const override {
694 instance->as_upcall_stub()->print_on_impl(st);
695 }
696 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
697 instance->as_upcall_stub()->print_value_on_impl(st);
698 }
699 };
700
701 static const Vptr _vpntr;
702 };
703
704 #endif // SHARE_CODE_CODEBLOB_HPP