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