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 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 BufferedInlineType,
88 RuntimeStub,
89 Deoptimization,
90 Safepoint,
91 #ifdef COMPILER2
92 Exception,
93 UncommonTrap,
94 #endif
95 Upcall,
96 Number_Of_Kinds
97 };
98
99 class UpcallStub; // for as_upcall_stub()
100 class RuntimeStub; // for as_runtime_stub()
101 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
102
103 class CodeBlob {
104 friend class VMStructs;
105 friend class JVMCIVMStructs;
106
107 protected:
108 // order fields from large to small to minimize padding between fields
109 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
110 const char* _name;
111 address _mutable_data;
112
113 int _size; // total size of CodeBlob in bytes
114 int _relocation_size; // size of relocation (could be bigger than 64Kb)
115 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
116 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
117 int _data_offset; // offset to where data region begins
118 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
119 int _mutable_data_size;
120
121 S390_ONLY(int _ctable_offset;)
122
123 uint16_t _header_size; // size of header (depends on subclass)
124 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
125 // not finished setting up their frame. Beware of pc's in
126 // that range. There is a similar range(s) on returns
127 // which we don't detect.
128
129 CodeBlobKind _kind; // Kind of this code blob
130
131 bool _caller_must_gc_arguments;
132
133 #ifndef PRODUCT
134 AsmRemarks _asm_remarks;
135 DbgStrings _dbg_strings;
136 #endif
137
138 void print_on_impl(outputStream* st) const;
139 void print_value_on_impl(outputStream* st) const;
140
141 class Vptr {
142 public:
143 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
144 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
145 };
146
147 const Vptr* vptr() const;
148
149 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
150 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
151 int mutable_data_size);
152
153 // Simple CodeBlob used for simple BufferBlob.
154 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
155
156 void operator delete(void* p) { }
157
158 public:
159
160 ~CodeBlob() {
161 assert(_oop_maps == nullptr, "Not flushed");
162 }
163
164 // Returns the space needed for CodeBlob
165 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
166 static unsigned int align_code_offset(int offset);
167
168 // Deletion
169 void purge();
170
171 // Typing
172 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
173 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
174 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
175 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
176 #ifdef COMPILER2
177 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
178 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
179 #else
180 bool is_uncommon_trap_stub() const { return false; }
181 bool is_exception_stub() const { return false; }
182 #endif
183 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
184 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
185 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
186 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
187 bool is_buffered_inline_type_blob() const { return _kind == CodeBlobKind::BufferedInlineType; }
188 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
189
190 // Casting
191 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
192 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
193 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
194 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
195 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
196
197 // Boundaries
198 address header_begin() const { return (address) this; }
199 address header_end() const { return ((address) this) + _header_size; }
200 address content_begin() const { return (address) header_begin() + _content_offset; }
201 address content_end() const { return (address) header_begin() + _data_offset; }
202 address code_begin() const { return (address) header_begin() + _code_offset; }
203 address code_end() const { return (address) header_begin() + _data_offset; }
204 address data_begin() const { return (address) header_begin() + _data_offset; }
205 address data_end() const { return (address) header_begin() + _size; }
206 address blob_end() const { return (address) header_begin() + _size; }
207 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
208
209 int mutable_data_size() const { return _mutable_data_size; }
210 address mutable_data_begin() const { return _mutable_data; }
211 address mutable_data_end() const { return _mutable_data + _mutable_data_size; }
212
213 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; }
214 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); }
215
216 // Offsets
217 int content_offset() const { return _content_offset; }
218 int code_offset() const { return _code_offset; }
219
220 // This field holds the beginning of the const section in the old code buffer.
221 // It is needed to fix relocations of pc-relative loads when resizing the
222 // the constant pool or moving it.
223 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
224 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
225
226 // Sizes
227 int size() const { return _size; }
228 int header_size() const { return _header_size; }
229 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
230 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
231 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
232
233 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
234 void adjust_size(size_t used) {
235 _size = (int)used;
236 _data_offset = _size;
237 }
238
239 // Containment
240 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); }
241 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
242 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
243 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
244 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
245 int frame_complete_offset() const { return _frame_complete_offset; }
246
247 // OopMap for frame
248 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
249 void set_oop_maps(OopMapSet* p);
250
251 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
252 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
253
254 // Frame support. Sizes are in word units.
255 int frame_size() const { return _frame_size; }
256 void set_frame_size(int size) { _frame_size = size; }
257
258 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
259 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
260
261 // Naming
262 const char* name() const { return _name; }
263 void set_name(const char* name) { _name = name; }
264
265 // Debugging
266 void verify();
267 void print() const;
268 void print_on(outputStream* st) const;
269 void print_value_on(outputStream* st) const;
270
271 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
272 void print_code_on(outputStream* st);
273
274 // Print to stream, any comments associated with offset.
275 void print_block_comment(outputStream* stream, address block_begin) const;
276
277 #ifndef PRODUCT
278 AsmRemarks &asm_remarks() { return _asm_remarks; }
279 DbgStrings &dbg_strings() { return _dbg_strings; }
280
281 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
282 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
283 #endif
284 };
285
286 //----------------------------------------------------------------------------------------------------
287 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
288
289 class RuntimeBlob : public CodeBlob {
290 friend class VMStructs;
291 public:
292
293 // Creation
294 // a) simple CodeBlob
295 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
296 : CodeBlob(name, kind, size, header_size)
297 {}
298
299 // b) full CodeBlob
300 // frame_complete is the offset from the beginning of the instructions
301 // to where the frame setup (from stackwalk viewpoint) is complete.
302 RuntimeBlob(
303 const char* name,
304 CodeBlobKind kind,
305 CodeBuffer* cb,
306 int size,
307 uint16_t header_size,
308 int16_t frame_complete,
309 int frame_size,
310 OopMapSet* oop_maps,
311 bool caller_must_gc_arguments = false
312 );
313
314 static void free(RuntimeBlob* blob);
315
316 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
317 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
318
319 class Vptr : public CodeBlob::Vptr {
320 };
321 };
322
323 class WhiteBox;
324 //----------------------------------------------------------------------------------------------------
325 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
326
327 class BufferBlob: public RuntimeBlob {
328 friend class VMStructs;
329 friend class AdapterBlob;
330 friend class VtableBlob;
331 friend class MethodHandlesAdapterBlob;
332 friend class BufferedInlineTypeBlob;
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, int header_size);
340 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);
341
342 void* operator new(size_t s, unsigned size) throw();
343
344 public:
345 // Creation
346 static BufferBlob* create(const char* name, uint buffer_size);
347 static BufferBlob* create(const char* name, CodeBuffer* cb);
348
349 static void free(BufferBlob* buf);
350
351 void print_on_impl(outputStream* st) const;
352 void print_value_on_impl(outputStream* st) const;
353
354 class Vptr : public RuntimeBlob::Vptr {
355 void print_on(const CodeBlob* instance, outputStream* st) const override {
356 ((const BufferBlob*)instance)->print_on_impl(st);
357 }
358 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
359 ((const BufferBlob*)instance)->print_value_on_impl(st);
360 }
361 };
362
363 static const Vptr _vpntr;
364 };
365
366
367 //----------------------------------------------------------------------------------------------------
368 // AdapterBlob: used to hold C2I/I2C adapters
369
370 class AdapterBlob: public BufferBlob {
371 private:
372 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
373
374 public:
375 // Creation
376 static AdapterBlob* create(CodeBuffer* cb,
377 int frame_complete,
378 int frame_size,
379 OopMapSet* oop_maps,
380 bool caller_must_gc_arguments = false);
381
382 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
383 };
384
385 //---------------------------------------------------------------------------------------------------
386 class VtableBlob: public BufferBlob {
387 private:
388 VtableBlob(const char*, int);
389
390 void* operator new(size_t s, unsigned size) throw();
391
392 public:
393 // Creation
394 static VtableBlob* create(const char* name, int buffer_size);
395 };
396
397 //----------------------------------------------------------------------------------------------------
398 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
399
400 class MethodHandlesAdapterBlob: public BufferBlob {
401 private:
402 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
403
404 public:
405 // Creation
406 static MethodHandlesAdapterBlob* create(int buffer_size);
407 };
408
409 //----------------------------------------------------------------------------------------------------
410 // BufferedInlineTypeBlob : used for pack/unpack handlers
411
412 class BufferedInlineTypeBlob: public BufferBlob {
413 private:
414 const int _pack_fields_off;
415 const int _pack_fields_jobject_off;
416 const int _unpack_fields_off;
417
418 BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
419
420 public:
421 // Creation
422 static BufferedInlineTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
423
424 address pack_fields() const { return code_begin() + _pack_fields_off; }
425 address pack_fields_jobject() const { return code_begin() + _pack_fields_jobject_off; }
426 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
427 };
428
429 //----------------------------------------------------------------------------------------------------
430 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
431
432 class RuntimeStub: public RuntimeBlob {
433 friend class VMStructs;
434 private:
435 // Creation support
436 RuntimeStub(
437 const char* name,
438 CodeBuffer* cb,
439 int size,
440 int16_t frame_complete,
441 int frame_size,
442 OopMapSet* oop_maps,
443 bool caller_must_gc_arguments
444 );
445
446 void* operator new(size_t s, unsigned size) throw();
447
448 public:
449 // Creation
450 static RuntimeStub* new_runtime_stub(
451 const char* stub_name,
452 CodeBuffer* cb,
453 int16_t frame_complete,
454 int frame_size,
455 OopMapSet* oop_maps,
456 bool caller_must_gc_arguments,
457 bool alloc_fail_is_fatal=true
458 );
459
460 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
461
462 address entry_point() const { return code_begin(); }
463
464 void print_on_impl(outputStream* st) const;
465 void print_value_on_impl(outputStream* st) const;
466
467 class Vptr : public RuntimeBlob::Vptr {
468 void print_on(const CodeBlob* instance, outputStream* st) const override {
469 instance->as_runtime_stub()->print_on_impl(st);
470 }
471 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
472 instance->as_runtime_stub()->print_value_on_impl(st);
473 }
474 };
475
476 static const Vptr _vpntr;
477 };
478
479
480 //----------------------------------------------------------------------------------------------------
481 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
482
483 class SingletonBlob: public RuntimeBlob {
484 friend class VMStructs;
485
486 protected:
487 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
488
489 public:
490 SingletonBlob(
491 const char* name,
492 CodeBlobKind kind,
493 CodeBuffer* cb,
494 int size,
495 uint16_t header_size,
496 int frame_size,
497 OopMapSet* oop_maps
498 )
499 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
500 {};
501
502 address entry_point() { return code_begin(); }
503
504 void print_on_impl(outputStream* st) const;
505 void print_value_on_impl(outputStream* st) const;
506
507 class Vptr : public RuntimeBlob::Vptr {
508 void print_on(const CodeBlob* instance, outputStream* st) const override {
509 ((const SingletonBlob*)instance)->print_on_impl(st);
510 }
511 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
512 ((const SingletonBlob*)instance)->print_value_on_impl(st);
513 }
514 };
515
516 static const Vptr _vpntr;
517 };
518
519
520 //----------------------------------------------------------------------------------------------------
521 // DeoptimizationBlob
522
523 class DeoptimizationBlob: public SingletonBlob {
524 friend class VMStructs;
525 friend class JVMCIVMStructs;
526 private:
527 int _unpack_offset;
528 int _unpack_with_exception;
529 int _unpack_with_reexecution;
530
531 int _unpack_with_exception_in_tls;
532
533 #if INCLUDE_JVMCI
534 // Offsets when JVMCI calls uncommon_trap.
535 int _uncommon_trap_offset;
536 int _implicit_exception_uncommon_trap_offset;
537 #endif
538
539 // Creation support
540 DeoptimizationBlob(
541 CodeBuffer* cb,
542 int size,
543 OopMapSet* oop_maps,
544 int unpack_offset,
545 int unpack_with_exception_offset,
546 int unpack_with_reexecution_offset,
547 int frame_size
548 );
549
550 public:
551 // Creation
552 static DeoptimizationBlob* create(
553 CodeBuffer* cb,
554 OopMapSet* oop_maps,
555 int unpack_offset,
556 int unpack_with_exception_offset,
557 int unpack_with_reexecution_offset,
558 int frame_size
559 );
560
561 address unpack() const { return code_begin() + _unpack_offset; }
562 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
563 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
564
565 // Alternate entry point for C1 where the exception and issuing pc
566 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
567 // instead of being in registers. This is needed because C1 doesn't
568 // model exception paths in a way that keeps these registers free so
569 // there may be live values in those registers during deopt.
570 void set_unpack_with_exception_in_tls_offset(int offset) {
571 _unpack_with_exception_in_tls = offset;
572 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
573 }
574 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
575
576 #if INCLUDE_JVMCI
577 // Offsets when JVMCI calls uncommon_trap.
578 void set_uncommon_trap_offset(int offset) {
579 _uncommon_trap_offset = offset;
580 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
581 }
582 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
583
584 void set_implicit_exception_uncommon_trap_offset(int offset) {
585 _implicit_exception_uncommon_trap_offset = offset;
586 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
587 }
588 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
589 #endif // INCLUDE_JVMCI
590
591 void print_value_on_impl(outputStream* st) const;
592
593 class Vptr : public SingletonBlob::Vptr {
594 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
595 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
596 }
597 };
598
599 static const Vptr _vpntr;
600 };
601
602
603 //----------------------------------------------------------------------------------------------------
604 // UncommonTrapBlob (currently only used by Compiler 2)
605
606 #ifdef COMPILER2
607
608 class UncommonTrapBlob: public SingletonBlob {
609 friend class VMStructs;
610 private:
611 // Creation support
612 UncommonTrapBlob(
613 CodeBuffer* cb,
614 int size,
615 OopMapSet* oop_maps,
616 int frame_size
617 );
618
619 public:
620 // Creation
621 static UncommonTrapBlob* create(
622 CodeBuffer* cb,
623 OopMapSet* oop_maps,
624 int frame_size
625 );
626 };
627
628
629 //----------------------------------------------------------------------------------------------------
630 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
631
632 class ExceptionBlob: public SingletonBlob {
633 friend class VMStructs;
634 private:
635 // Creation support
636 ExceptionBlob(
637 CodeBuffer* cb,
638 int size,
639 OopMapSet* oop_maps,
640 int frame_size
641 );
642
643 public:
644 // Creation
645 static ExceptionBlob* create(
646 CodeBuffer* cb,
647 OopMapSet* oop_maps,
648 int frame_size
649 );
650 };
651 #endif // COMPILER2
652
653
654 //----------------------------------------------------------------------------------------------------
655 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
656
657 class SafepointBlob: public SingletonBlob {
658 friend class VMStructs;
659 private:
660 // Creation support
661 SafepointBlob(
662 CodeBuffer* cb,
663 int size,
664 OopMapSet* oop_maps,
665 int frame_size
666 );
667
668 public:
669 // Creation
670 static SafepointBlob* create(
671 CodeBuffer* cb,
672 OopMapSet* oop_maps,
673 int frame_size
674 );
675 };
676
677 //----------------------------------------------------------------------------------------------------
678
679 class UpcallLinker;
680
681 // A (Panama) upcall stub. Not used by JNI.
682 class UpcallStub: public RuntimeBlob {
683 friend class VMStructs;
684 friend class UpcallLinker;
685 private:
686 jobject _receiver;
687 ByteSize _frame_data_offset;
688
689 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
690
691 void* operator new(size_t s, unsigned size) throw();
692
693 struct FrameData {
694 JavaFrameAnchor jfa;
695 JavaThread* thread;
696 JNIHandleBlock* old_handles;
697 JNIHandleBlock* new_handles;
698 };
699
700 // defined in frame_ARCH.cpp
701 FrameData* frame_data_for_frame(const frame& frame) const;
702 public:
703 // Creation
704 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
705
706 static void free(UpcallStub* blob);
707
708 jobject receiver() { return _receiver; }
709
710 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
711
712 // GC support
713 void oops_do(OopClosure* f, const frame& frame);
714
715 void print_on_impl(outputStream* st) const;
716 void print_value_on_impl(outputStream* st) const;
717
718 class Vptr : public RuntimeBlob::Vptr {
719 void print_on(const CodeBlob* instance, outputStream* st) const override {
720 instance->as_upcall_stub()->print_on_impl(st);
721 }
722 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
723 instance->as_upcall_stub()->print_value_on_impl(st);
724 }
725 };
726
727 static const Vptr _vpntr;
728 };
729
730 #endif // SHARE_CODE_CODEBLOB_HPP