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/aotCodeCache.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 class AdapterBlob;
102 class ExceptionBlob;
103
104 class CodeBlob {
105 friend class VMStructs;
106 friend class JVMCIVMStructs;
107
108 private:
109 void restore_mutable_data(address reloc_data);
110
111 protected:
112 // order fields from large to small to minimize padding between fields
113 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
114 const char* _name;
115 address _mutable_data;
116
117 int _size; // total size of CodeBlob in bytes
118 int _relocation_size; // size of relocation (could be bigger than 64Kb)
119 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
120 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
121 int _data_offset; // offset to where data region begins
122 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
123 int _mutable_data_size;
124
125 S390_ONLY(int _ctable_offset;)
126
127 uint16_t _header_size; // size of header (depends on subclass)
128 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
129 // not finished setting up their frame. Beware of pc's in
130 // that range. There is a similar range(s) on returns
131 // which we don't detect.
132
133 CodeBlobKind _kind; // Kind of this code blob
134
135 bool _caller_must_gc_arguments;
136
137 #ifndef PRODUCT
138 AsmRemarks _asm_remarks;
139 DbgStrings _dbg_strings;
140 #endif
141
142 void print_on_impl(outputStream* st) const;
143 void print_value_on_impl(outputStream* st) const;
144
145 class Vptr {
146 public:
147 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
148 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
149 virtual void prepare_for_archiving(CodeBlob* instance) const {
150 instance->prepare_for_archiving_impl();
151 };
152 virtual void post_restore(CodeBlob* instance) const {
153 instance->post_restore_impl();
154 };
155 };
156
157 static const Vptr* vptr(CodeBlobKind kind);
158 const Vptr* vptr() const;
159
160 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
161 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
162 int mutable_data_size);
163
164 // Simple CodeBlob used for simple BufferBlob.
165 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
166
167
168 void operator delete(void* p) { }
169
170 void prepare_for_archiving_impl();
171 void post_restore_impl();
172
173 public:
174
175 ~CodeBlob() {
176 assert(_oop_maps == nullptr || AOTCodeCache::is_address_in_aot_cache((address)_oop_maps), "Not flushed");
177 }
178
179 // Returns the space needed for CodeBlob
180 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
181 static unsigned int align_code_offset(int offset);
182
183 // Deletion
184 void purge();
185
186 // Typing
187 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
188 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
189 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
190 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
191 #ifdef COMPILER2
192 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
193 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
194 #else
195 bool is_uncommon_trap_stub() const { return false; }
196 bool is_exception_stub() const { return false; }
197 #endif
198 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
199 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
200 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
201 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
202 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
203
204 // Casting
205 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
206 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
207 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
208 AdapterBlob* as_adapter_blob() const { assert(is_adapter_blob(), "must be adapter blob"); return (AdapterBlob*) this; }
209 ExceptionBlob* as_exception_blob() const { assert(is_exception_stub(), "must be exception stub"); return (ExceptionBlob*) this; }
210 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
211 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
212
213 // Boundaries
214 address header_begin() const { return (address) this; }
215 address header_end() const { return ((address) this) + _header_size; }
216 address content_begin() const { return (address) header_begin() + _content_offset; }
217 address content_end() const { return (address) header_begin() + _data_offset; }
218 address code_begin() const { return (address) header_begin() + _code_offset; }
219 address code_end() const { return (address) header_begin() + _data_offset; }
220 address data_begin() const { return (address) header_begin() + _data_offset; }
221 address data_end() const { return (address) header_begin() + _size; }
222 address blob_end() const { return (address) header_begin() + _size; }
223 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
224
225 int mutable_data_size() const { return _mutable_data_size; }
226 address mutable_data_begin() const { return _mutable_data; }
227 address mutable_data_end() const { return _mutable_data + _mutable_data_size; }
228
229 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; }
230 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); }
231
232 // Offsets
233 int content_offset() const { return _content_offset; }
234 int code_offset() const { return _code_offset; }
235
236 // This field holds the beginning of the const section in the old code buffer.
237 // It is needed to fix relocations of pc-relative loads when resizing the
238 // the constant pool or moving it.
239 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
240 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
241
242 // Sizes
243 int size() const { return _size; }
244 int header_size() const { return _header_size; }
245 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
246 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
247 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
248
249 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
250 void adjust_size(size_t used) {
251 _size = (int)used;
252 _data_offset = _size;
253 }
254
255 // Containment
256 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); }
257 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
258 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
259 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
260 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
261 int frame_complete_offset() const { return _frame_complete_offset; }
262
263 // OopMap for frame
264 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
265 void set_oop_maps(OopMapSet* p);
266 void set_oop_maps(ImmutableOopMapSet* p) { _oop_maps = p; }
267
268 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
269 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
270
271 // Frame support. Sizes are in word units.
272 int frame_size() const { return _frame_size; }
273 void set_frame_size(int size) { _frame_size = size; }
274
275 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
276 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
277
278 // Naming
279 const char* name() const { return _name; }
280 void set_name(const char* name) { _name = name; }
281
282 // Debugging
283 void verify();
284 void print() const;
285 void print_on(outputStream* st) const;
286 void print_value_on(outputStream* st) const;
287
288 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
289 void print_code_on(outputStream* st);
290
291 // Print to stream, any comments associated with offset.
292 void print_block_comment(outputStream* stream, address block_begin) const;
293
294 #ifndef PRODUCT
295 AsmRemarks &asm_remarks() { return _asm_remarks; }
296 DbgStrings &dbg_strings() { return _dbg_strings; }
297
298 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
299 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
300 #endif
301
302 void copy_to(address buffer) {
303 memcpy(buffer, this, this->size());
304 }
305
306 // methods to archive a blob into AOT code cache
307 void prepare_for_archiving();
308 static void archive_blob(CodeBlob* blob, address archive_buffer);
309
310 // methods to restore a blob from AOT code cache into the CodeCache
311 void post_restore();
312 CodeBlob* restore(address code_cache_buffer, const char* name, address archived_reloc_data, ImmutableOopMapSet* archived_oop_maps);
313 static CodeBlob* create(CodeBlob* archived_blob, const char* name, address archived_reloc_data, ImmutableOopMapSet* archived_oop_maps);
314 };
315
316 //----------------------------------------------------------------------------------------------------
317 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
318
319 class RuntimeBlob : public CodeBlob {
320 friend class VMStructs;
321 public:
322
323 // Creation
324 // a) simple CodeBlob
325 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
326 : CodeBlob(name, kind, size, header_size)
327 {}
328
329 // b) full CodeBlob
330 // frame_complete is the offset from the beginning of the instructions
331 // to where the frame setup (from stackwalk viewpoint) is complete.
332 RuntimeBlob(
333 const char* name,
334 CodeBlobKind kind,
335 CodeBuffer* cb,
336 int size,
337 uint16_t header_size,
338 int16_t frame_complete,
339 int frame_size,
340 OopMapSet* oop_maps,
341 bool caller_must_gc_arguments = false
342 );
343
344 static void free(RuntimeBlob* blob);
345
346 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
347 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
348
349 class Vptr : public CodeBlob::Vptr {
350 };
351 };
352
353 class WhiteBox;
354 //----------------------------------------------------------------------------------------------------
355 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
356
357 class BufferBlob: public RuntimeBlob {
358 friend class VMStructs;
359 friend class AdapterBlob;
360 friend class VtableBlob;
361 friend class MethodHandlesAdapterBlob;
362 friend class UpcallStub;
363 friend class WhiteBox;
364
365 private:
366 // Creation support
367 BufferBlob(const char* name, CodeBlobKind kind, int size);
368 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size);
369
370 void* operator new(size_t s, unsigned size) throw();
371
372 public:
373 // Creation
374 static BufferBlob* create(const char* name, uint buffer_size);
375 static BufferBlob* create(const char* name, CodeBuffer* cb);
376
377 static void free(BufferBlob* buf);
378
379 void print_on_impl(outputStream* st) const;
380 void print_value_on_impl(outputStream* st) const;
381
382 class Vptr : public RuntimeBlob::Vptr {
383 void print_on(const CodeBlob* instance, outputStream* st) const override {
384 ((const BufferBlob*)instance)->print_on_impl(st);
385 }
386 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
387 ((const BufferBlob*)instance)->print_value_on_impl(st);
388 }
389 };
390
391 static const Vptr _vpntr;
392 };
393
394
395 //----------------------------------------------------------------------------------------------------
396 // AdapterBlob: used to hold C2I/I2C adapters
397
398 class AdapterBlob: public BufferBlob {
399 private:
400 AdapterBlob(int size, CodeBuffer* cb);
401
402 public:
403 // Creation
404 static AdapterBlob* create(CodeBuffer* cb);
405 };
406
407 //---------------------------------------------------------------------------------------------------
408 class VtableBlob: public BufferBlob {
409 private:
410 VtableBlob(const char*, int);
411
412 void* operator new(size_t s, unsigned size) throw();
413
414 public:
415 // Creation
416 static VtableBlob* create(const char* name, int buffer_size);
417 };
418
419 //----------------------------------------------------------------------------------------------------
420 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
421
422 class MethodHandlesAdapterBlob: public BufferBlob {
423 private:
424 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
425
426 public:
427 // Creation
428 static MethodHandlesAdapterBlob* create(int buffer_size);
429 };
430
431
432 //----------------------------------------------------------------------------------------------------
433 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
434
435 class RuntimeStub: public RuntimeBlob {
436 friend class VMStructs;
437 private:
438 // Creation support
439 RuntimeStub(
440 const char* name,
441 CodeBuffer* cb,
442 int size,
443 int16_t frame_complete,
444 int frame_size,
445 OopMapSet* oop_maps,
446 bool caller_must_gc_arguments
447 );
448
449 void* operator new(size_t s, unsigned size) throw();
450
451 public:
452 // Creation
453 static RuntimeStub* new_runtime_stub(
454 const char* stub_name,
455 CodeBuffer* cb,
456 int16_t frame_complete,
457 int frame_size,
458 OopMapSet* oop_maps,
459 bool caller_must_gc_arguments,
460 bool alloc_fail_is_fatal=true
461 );
462
463 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
464
465 address entry_point() const { return code_begin(); }
466
467 void print_on_impl(outputStream* st) const;
468 void print_value_on_impl(outputStream* st) const;
469
470 class Vptr : public RuntimeBlob::Vptr {
471 void print_on(const CodeBlob* instance, outputStream* st) const override {
472 instance->as_runtime_stub()->print_on_impl(st);
473 }
474 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
475 instance->as_runtime_stub()->print_value_on_impl(st);
476 }
477 };
478
479 static const Vptr _vpntr;
480 };
481
482
483 //----------------------------------------------------------------------------------------------------
484 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
485
486 class SingletonBlob: public RuntimeBlob {
487 friend class VMStructs;
488
489 protected:
490 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
491
492 public:
493 SingletonBlob(
494 const char* name,
495 CodeBlobKind kind,
496 CodeBuffer* cb,
497 int size,
498 uint16_t header_size,
499 int frame_size,
500 OopMapSet* oop_maps
501 )
502 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
503 {};
504
505 address entry_point() { return code_begin(); }
506
507 void print_on_impl(outputStream* st) const;
508 void print_value_on_impl(outputStream* st) const;
509
510 class Vptr : public RuntimeBlob::Vptr {
511 void print_on(const CodeBlob* instance, outputStream* st) const override {
512 ((const SingletonBlob*)instance)->print_on_impl(st);
513 }
514 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
515 ((const SingletonBlob*)instance)->print_value_on_impl(st);
516 }
517 };
518
519 static const Vptr _vpntr;
520 };
521
522
523 //----------------------------------------------------------------------------------------------------
524 // DeoptimizationBlob
525
526 class DeoptimizationBlob: public SingletonBlob {
527 friend class VMStructs;
528 friend class JVMCIVMStructs;
529 private:
530 int _unpack_offset;
531 int _unpack_with_exception;
532 int _unpack_with_reexecution;
533
534 int _unpack_with_exception_in_tls;
535
536 #if INCLUDE_JVMCI
537 // Offsets when JVMCI calls uncommon_trap.
538 int _uncommon_trap_offset;
539 int _implicit_exception_uncommon_trap_offset;
540 #endif
541
542 // Creation support
543 DeoptimizationBlob(
544 CodeBuffer* cb,
545 int size,
546 OopMapSet* oop_maps,
547 int unpack_offset,
548 int unpack_with_exception_offset,
549 int unpack_with_reexecution_offset,
550 int frame_size
551 );
552
553 public:
554 // Creation
555 static DeoptimizationBlob* create(
556 CodeBuffer* cb,
557 OopMapSet* oop_maps,
558 int unpack_offset,
559 int unpack_with_exception_offset,
560 int unpack_with_reexecution_offset,
561 int frame_size
562 );
563
564 address unpack() const { return code_begin() + _unpack_offset; }
565 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
566 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
567
568 // Alternate entry point for C1 where the exception and issuing pc
569 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
570 // instead of being in registers. This is needed because C1 doesn't
571 // model exception paths in a way that keeps these registers free so
572 // there may be live values in those registers during deopt.
573 void set_unpack_with_exception_in_tls_offset(int offset) {
574 _unpack_with_exception_in_tls = offset;
575 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
576 }
577 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
578
579 #if INCLUDE_JVMCI
580 // Offsets when JVMCI calls uncommon_trap.
581 void set_uncommon_trap_offset(int offset) {
582 _uncommon_trap_offset = offset;
583 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
584 }
585 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
586
587 void set_implicit_exception_uncommon_trap_offset(int offset) {
588 _implicit_exception_uncommon_trap_offset = offset;
589 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
590 }
591 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
592 #endif // INCLUDE_JVMCI
593
594 void print_value_on_impl(outputStream* st) const;
595
596 class Vptr : public SingletonBlob::Vptr {
597 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
598 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
599 }
600 };
601
602 static const Vptr _vpntr;
603 };
604
605
606 //----------------------------------------------------------------------------------------------------
607 // UncommonTrapBlob (currently only used by Compiler 2)
608
609 #ifdef COMPILER2
610
611 class UncommonTrapBlob: public SingletonBlob {
612 friend class VMStructs;
613 private:
614 // Creation support
615 UncommonTrapBlob(
616 CodeBuffer* cb,
617 int size,
618 OopMapSet* oop_maps,
619 int frame_size
620 );
621
622 public:
623 // Creation
624 static UncommonTrapBlob* create(
625 CodeBuffer* cb,
626 OopMapSet* oop_maps,
627 int frame_size
628 );
629 };
630
631
632 //----------------------------------------------------------------------------------------------------
633 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
634
635 class ExceptionBlob: public SingletonBlob {
636 friend class VMStructs;
637 private:
638 // Creation support
639 ExceptionBlob(
640 CodeBuffer* cb,
641 int size,
642 OopMapSet* oop_maps,
643 int frame_size
644 );
645
646 public:
647 // Creation
648 static ExceptionBlob* create(
649 CodeBuffer* cb,
650 OopMapSet* oop_maps,
651 int frame_size
652 );
653
654 void post_restore_impl() {
655 trace_new_stub(this, "ExceptionBlob");
656 }
657
658 class Vptr : public SingletonBlob::Vptr {
659 void post_restore(CodeBlob* instance) const override {
660 ((ExceptionBlob*)instance)->post_restore_impl();
661 }
662 };
663
664 static const Vptr _vpntr;
665 };
666 #endif // COMPILER2
667
668
669 //----------------------------------------------------------------------------------------------------
670 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
671
672 class SafepointBlob: public SingletonBlob {
673 friend class VMStructs;
674 private:
675 // Creation support
676 SafepointBlob(
677 CodeBuffer* cb,
678 int size,
679 OopMapSet* oop_maps,
680 int frame_size
681 );
682
683 public:
684 // Creation
685 static SafepointBlob* create(
686 CodeBuffer* cb,
687 OopMapSet* oop_maps,
688 int frame_size
689 );
690 };
691
692 //----------------------------------------------------------------------------------------------------
693
694 class UpcallLinker;
695
696 // A (Panama) upcall stub. Not used by JNI.
697 class UpcallStub: public RuntimeBlob {
698 friend class VMStructs;
699 friend class UpcallLinker;
700 private:
701 jobject _receiver;
702 ByteSize _frame_data_offset;
703
704 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
705
706 void* operator new(size_t s, unsigned size) throw();
707
708 struct FrameData {
709 JavaFrameAnchor jfa;
710 JavaThread* thread;
711 JNIHandleBlock* old_handles;
712 JNIHandleBlock* new_handles;
713 };
714
715 // defined in frame_ARCH.cpp
716 FrameData* frame_data_for_frame(const frame& frame) const;
717 public:
718 // Creation
719 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
720
721 static void free(UpcallStub* blob);
722
723 jobject receiver() { return _receiver; }
724
725 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
726
727 // GC support
728 void oops_do(OopClosure* f, const frame& frame);
729
730 void print_on_impl(outputStream* st) const;
731 void print_value_on_impl(outputStream* st) const;
732
733 class Vptr : public RuntimeBlob::Vptr {
734 void print_on(const CodeBlob* instance, outputStream* st) const override {
735 instance->as_upcall_stub()->print_on_impl(st);
736 }
737 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
738 instance->as_upcall_stub()->print_value_on_impl(st);
739 }
740 };
741
742 static const Vptr _vpntr;
743 };
744
745 #endif // SHARE_CODE_CODEBLOB_HPP