1 /*
2 * Copyright (c) 1998, 2018, 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_VM_CODE_CODEBLOB_HPP
26 #define SHARE_VM_CODE_CODEBLOB_HPP
27
28 #include "asm/codeBuffer.hpp"
29 #include "compiler/compilerDefinitions.hpp"
30 #include "compiler/oopMap.hpp"
31 #include "runtime/frame.hpp"
32 #include "runtime/handles.hpp"
33 #include "utilities/align.hpp"
34 #include "utilities/macros.hpp"
35
36 // CodeBlob Types
37 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
38 struct CodeBlobType {
39 enum {
40 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
41 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
42 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
43 All = 3, // All types (No code cache segmentation)
44 AOT = 4, // AOT methods
45 NumTypes = 5 // Number of CodeBlobTypes
46 };
47 };
48
49 // CodeBlob - superclass for all entries in the CodeCache.
50 //
51 // Subtypes are:
52 // CompiledMethod : Compiled Java methods (include method that calls to native code)
53 // nmethod : JIT Compiled Java methods
54 // AOTCompiledMethod : AOT Compiled Java methods - Not in the CodeCache!
55 // AOTCompiledMethod objects are allocated in the C-Heap, the code they
56 // point to is allocated in the AOTCodeHeap which is in the C-Heap as
57 // well (i.e. it's the memory where the shared library was loaded to)
58 // RuntimeBlob : Non-compiled method code; generated glue code
59 // BufferBlob : Used for non-relocatable code such as interpreter, stubroutines, etc.
60 // AdapterBlob : Used to hold C2I/I2C adapters
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 // ExceptionBlob : Used for stack unrolling
66 // SafepointBlob : Used to handle illegal instruction exceptions
67 // UncommonTrapBlob : Used to handle uncommon traps
68 //
69 //
70 // Layout (all except AOTCompiledMethod) : continuous in the CodeCache
71 // - header
72 // - relocation
73 // - content space
74 // - instruction space
75 // - data space
76 //
77 // Layout (AOTCompiledMethod) : in the C-Heap
78 // - header -\
79 // ... |
80 // - code <-/
81
82
83 class CodeBlobLayout;
84
85 class CodeBlob {
86 friend class VMStructs;
87 friend class JVMCIVMStructs;
88 friend class CodeCacheDumper;
89
90 protected:
91
92 const CompilerType _type; // CompilerType
93 int _size; // total size of CodeBlob in bytes
94 int _header_size; // size of header (depends on subclass)
95 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
96 // not finished setting up their frame. Beware of pc's in
97 // that range. There is a similar range(s) on returns
98 // which we don't detect.
99 int _data_offset; // offset to where data region begins
100 int _frame_size; // size of stack frame
101
102 address _code_begin;
103 address _code_end;
104 address _content_begin; // address to where content region begins (this includes consts, insts, stubs)
105 // address _content_end - not required, for all CodeBlobs _code_end == _content_end for now
106 address _data_end;
107 address _relocation_begin;
108 address _relocation_end;
109
110 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
111 bool _caller_must_gc_arguments;
112 CodeStrings _strings;
113 const char* _name;
114 S390_ONLY(int _ctable_offset;)
115
116 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments);
117 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments);
118 public:
119 // Returns the space needed for CodeBlob
120 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
121 static unsigned int align_code_offset(int offset);
122
123 // Deletion
124 virtual void flush();
125
126 // Typing
127 virtual bool is_buffer_blob() const { return false; }
128 virtual bool is_nmethod() const { return false; }
129 virtual bool is_runtime_stub() const { return false; }
130 virtual bool is_deoptimization_stub() const { return false; }
131 virtual bool is_uncommon_trap_stub() const { return false; }
132 virtual bool is_exception_stub() const { return false; }
133 virtual bool is_safepoint_stub() const { return false; }
134 virtual bool is_adapter_blob() const { return false; }
135 virtual bool is_method_handles_adapter_blob() const { return false; }
136 virtual bool is_aot() const { return false; }
137 virtual bool is_compiled() const { return false; }
138
139 inline bool is_compiled_by_c1() const { return _type == compiler_c1; };
140 inline bool is_compiled_by_c2() const { return _type == compiler_c2; };
141 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; };
142 const char* compiler_name() const;
143
144 // Casting
145 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; }
146 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
147 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; }
148 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; }
149 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
150
151 // Boundaries
152 address header_begin() const { return (address) this; }
153 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; };
154 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; }
155 address content_begin() const { return _content_begin; }
156 address content_end() const { return _code_end; } // _code_end == _content_end is true for all types of blobs for now, it is also checked in the constructor
157 address code_begin() const { return _code_begin; }
158 address code_end() const { return _code_end; }
159 address data_end() const { return _data_end; }
160
161 // This field holds the beginning of the const section in the old code buffer.
162 // It is needed to fix relocations of pc-relative loads when resizing the
163 // the constant pool or moving it.
164 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
165 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
166
167 // Sizes
168 int size() const { return _size; }
169 int header_size() const { return _header_size; }
170 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); }
171 int content_size() const { return content_end() - content_begin(); }
172 int code_size() const { return code_end() - code_begin(); }
173 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
174 void adjust_size(size_t used) {
175 _size = (int)used;
176 _data_offset = (int)used;
177 _code_end = (address)this + used;
178 _data_end = (address)this + used;
179 }
180
181 // Containment
182 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
183 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
184 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
185 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
186 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
187
188 // CodeCache support: really only used by the nmethods, but in order to get
189 // asserts and certain bookkeeping to work in the CodeCache they are defined
190 // virtual here.
191 virtual bool is_zombie() const { return false; }
192 virtual bool is_locked_by_vm() const { return false; }
193
194 virtual bool is_unloaded() const { return false; }
195 virtual bool is_not_entrant() const { return false; }
196
197 // GC support
198 virtual bool is_alive() const = 0;
199
200 // OopMap for frame
201 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
202 void set_oop_maps(OopMapSet* p);
203 const ImmutableOopMap* oop_map_for_return_address(address return_address);
204 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
205
206 // Frame support
207 int frame_size() const { return _frame_size; }
208 void set_frame_size(int size) { _frame_size = size; }
209
210 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
211 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
212
213 // Naming
214 const char* name() const { return _name; }
215 void set_name(const char* name) { _name = name; }
216
217 // Debugging
218 virtual void verify() = 0;
219 virtual void print() const { print_on(tty); };
220 virtual void print_on(outputStream* st) const;
221 virtual void print_value_on(outputStream* st) const;
222 void print_code();
223
224 // Print the comment associated with offset on stream, if there is one
225 virtual void print_block_comment(outputStream* stream, address block_begin) const {
226 intptr_t offset = (intptr_t)(block_begin - code_begin());
227 _strings.print_block_comment(stream, offset);
228 }
229
230 // Transfer ownership of comments to this CodeBlob
231 void set_strings(CodeStrings& strings) {
232 assert(!is_aot(), "invalid on aot");
233 _strings.assign(strings);
234 }
235
236 static ByteSize name_field_offset() {
237 return byte_offset_of(CodeBlob, _name);
238 }
239
240 static ByteSize oop_maps_field_offset() {
241 return byte_offset_of(CodeBlob, _oop_maps);
242 }
243 };
244
245 class CodeBlobLayout : public StackObj {
246 private:
247 int _size;
248 int _header_size;
249 int _relocation_size;
250 int _content_offset;
251 int _code_offset;
252 int _data_offset;
253 address _code_begin;
254 address _code_end;
255 address _content_begin;
256 address _content_end;
257 address _data_end;
258 address _relocation_begin;
259 address _relocation_end;
260
261 public:
262 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
263 _size(0),
264 _header_size(0),
265 _relocation_size(0),
266 _content_offset(0),
267 _code_offset(0),
268 _data_offset(0),
269 _content_begin(content_begin),
270 _content_end(content_end),
271 _code_begin(code_begin),
272 _code_end(code_end),
273 _data_end(data_end),
274 _relocation_begin(relocation_begin),
275 _relocation_end(relocation_end)
276 {
277 }
278
279 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
280 _size(size),
281 _header_size(header_size),
282 _relocation_size(relocation_size),
283 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
284 _code_offset(_content_offset),
285 _data_offset(data_offset)
286 {
287 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
288
289 _code_begin = (address) start + _code_offset;
290 _code_end = (address) start + _data_offset;
291
292 _content_begin = (address) start + _content_offset;
293 _content_end = (address) start + _data_offset;
294
295 _data_end = (address) start + _size;
296 _relocation_begin = (address) start + _header_size;
297 _relocation_end = _relocation_begin + _relocation_size;
298 }
299
300 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
301 _size(size),
302 _header_size(header_size),
303 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
304 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
305 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
306 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize))
307 {
308 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
309
310 _code_begin = (address) start + _code_offset;
311 _code_end = (address) start + _data_offset;
312
313 _content_begin = (address) start + _content_offset;
314 _content_end = (address) start + _data_offset;
315
316 _data_end = (address) start + _size;
317 _relocation_begin = (address) start + _header_size;
318 _relocation_end = _relocation_begin + _relocation_size;
319 }
320
321 int size() const { return _size; }
322 int header_size() const { return _header_size; }
323 int relocation_size() const { return _relocation_size; }
324 int content_offset() const { return _content_offset; }
325 int code_offset() const { return _code_offset; }
326 int data_offset() const { return _data_offset; }
327 address code_begin() const { return _code_begin; }
328 address code_end() const { return _code_end; }
329 address data_end() const { return _data_end; }
330 address relocation_begin() const { return _relocation_begin; }
331 address relocation_end() const { return _relocation_end; }
332 address content_begin() const { return _content_begin; }
333 address content_end() const { return _content_end; }
334 };
335
336
337 class RuntimeBlob : public CodeBlob {
338 friend class VMStructs;
339 public:
340
341 // Creation
342 // a) simple CodeBlob
343 // frame_complete is the offset from the beginning of the instructions
344 // to where the frame setup (from stackwalk viewpoint) is complete.
345 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
346
347 // b) full CodeBlob
348 RuntimeBlob(
349 const char* name,
350 CodeBuffer* cb,
351 int header_size,
352 int size,
353 int frame_complete,
354 int frame_size,
355 OopMapSet* oop_maps,
356 bool caller_must_gc_arguments = false
357 );
358
359 // GC support
360 virtual bool is_alive() const = 0;
361
362 void verify();
363
364 // OopMap for frame
365 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
366
367 // Debugging
368 void print() const { print_on(tty); }
369 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
370 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
371
372 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
373 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
374 };
375
376 class WhiteBox;
377 //----------------------------------------------------------------------------------------------------
378 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
379
380 class BufferBlob: public RuntimeBlob {
381 friend class VMStructs;
382 friend class AdapterBlob;
383 friend class MethodHandlesAdapterBlob;
384 friend class WhiteBox;
385
386 private:
387 // Creation support
388 BufferBlob(const char* name, int size);
389 BufferBlob(const char* name, int size, CodeBuffer* cb);
390
391 void* operator new(size_t s, unsigned size) throw();
392
393 public:
394 // Creation
395 static BufferBlob* create(const char* name, int buffer_size);
396 static BufferBlob* create(const char* name, CodeBuffer* cb);
397
398 static void free(BufferBlob* buf);
399
400 // Typing
401 virtual bool is_buffer_blob() const { return true; }
402
403 // GC/Verification support
404 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
405 bool is_alive() const { return true; }
406
407 void verify();
408 void print_on(outputStream* st) const;
409 void print_value_on(outputStream* st) const;
410 };
411
412
413 //----------------------------------------------------------------------------------------------------
414 // AdapterBlob: used to hold C2I/I2C adapters
415
416 class AdapterBlob: public BufferBlob {
417 private:
418 AdapterBlob(int size, CodeBuffer* cb);
419
420 public:
421 // Creation
422 static AdapterBlob* create(CodeBuffer* cb);
423
424 // Typing
425 virtual bool is_adapter_blob() const { return true; }
426 };
427
428
429 //----------------------------------------------------------------------------------------------------
430 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
431
432 class MethodHandlesAdapterBlob: public BufferBlob {
433 private:
434 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
435
436 public:
437 // Creation
438 static MethodHandlesAdapterBlob* create(int buffer_size);
439
440 // Typing
441 virtual bool is_method_handles_adapter_blob() const { return true; }
442 };
443
444
445 //----------------------------------------------------------------------------------------------------
446 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
447
448 class RuntimeStub: public RuntimeBlob {
449 friend class VMStructs;
450 private:
451 // Creation support
452 RuntimeStub(
453 const char* name,
454 CodeBuffer* cb,
455 int size,
456 int frame_complete,
457 int frame_size,
458 OopMapSet* oop_maps,
459 bool caller_must_gc_arguments
460 );
461
462 void* operator new(size_t s, unsigned size) throw();
463
464 public:
465 // Creation
466 static RuntimeStub* new_runtime_stub(
467 const char* stub_name,
468 CodeBuffer* cb,
469 int frame_complete,
470 int frame_size,
471 OopMapSet* oop_maps,
472 bool caller_must_gc_arguments
473 );
474
475 // Typing
476 bool is_runtime_stub() const { return true; }
477
478 address entry_point() const { return code_begin(); }
479
480 // GC/Verification support
481 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
482 bool is_alive() const { return true; }
483
484 void verify();
485 void print_on(outputStream* st) const;
486 void print_value_on(outputStream* st) const;
487 };
488
489
490 //----------------------------------------------------------------------------------------------------
491 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
492
493 class SingletonBlob: public RuntimeBlob {
494 friend class VMStructs;
495
496 protected:
497 void* operator new(size_t s, unsigned size) throw();
498
499 public:
500 SingletonBlob(
501 const char* name,
502 CodeBuffer* cb,
503 int header_size,
504 int size,
505 int frame_size,
506 OopMapSet* oop_maps
507 )
508 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
509 {};
510
511 address entry_point() { return code_begin(); }
512
513 bool is_alive() const { return true; }
514
515 // GC/Verification support
516 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
517 void verify(); // does nothing
518 void print_on(outputStream* st) const;
519 void print_value_on(outputStream* st) const;
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 // Typing
565 bool is_deoptimization_stub() const { return true; }
566 bool exception_address_is_unpack_entry(address pc) const {
567 address unpack_pc = unpack();
568 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
569 }
570
571 // GC for args
572 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
573
574 // Printing
575 void print_value_on(outputStream* st) const;
576
577 address unpack() const { return code_begin() + _unpack_offset; }
578 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
579 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
580
581 // Alternate entry point for C1 where the exception and issuing pc
582 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
583 // instead of being in registers. This is needed because C1 doesn't
584 // model exception paths in a way that keeps these registers free so
585 // there may be live values in those registers during deopt.
586 void set_unpack_with_exception_in_tls_offset(int offset) {
587 _unpack_with_exception_in_tls = offset;
588 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
589 }
590 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
591
592 #if INCLUDE_JVMCI
593 // Offsets when JVMCI calls uncommon_trap.
594 void set_uncommon_trap_offset(int offset) {
595 _uncommon_trap_offset = offset;
596 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
597 }
598 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
599
600 void set_implicit_exception_uncommon_trap_offset(int offset) {
601 _implicit_exception_uncommon_trap_offset = offset;
602 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
603 }
604 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
605 #endif // INCLUDE_JVMCI
606 };
607
608
609 //----------------------------------------------------------------------------------------------------
610 // UncommonTrapBlob (currently only used by Compiler 2)
611
612 #ifdef COMPILER2
613
614 class UncommonTrapBlob: public SingletonBlob {
615 friend class VMStructs;
616 private:
617 // Creation support
618 UncommonTrapBlob(
619 CodeBuffer* cb,
620 int size,
621 OopMapSet* oop_maps,
622 int frame_size
623 );
624
625 public:
626 // Creation
627 static UncommonTrapBlob* create(
628 CodeBuffer* cb,
629 OopMapSet* oop_maps,
630 int frame_size
631 );
632
633 // GC for args
634 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
635
636 // Typing
637 bool is_uncommon_trap_stub() const { return true; }
638 };
639
640
641 //----------------------------------------------------------------------------------------------------
642 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
643
644 class ExceptionBlob: public SingletonBlob {
645 friend class VMStructs;
646 private:
647 // Creation support
648 ExceptionBlob(
649 CodeBuffer* cb,
650 int size,
651 OopMapSet* oop_maps,
652 int frame_size
653 );
654
655 public:
656 // Creation
657 static ExceptionBlob* create(
658 CodeBuffer* cb,
659 OopMapSet* oop_maps,
660 int frame_size
661 );
662
663 // GC for args
664 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
665
666 // Typing
667 bool is_exception_stub() const { return true; }
668 };
669 #endif // COMPILER2
670
671
672 //----------------------------------------------------------------------------------------------------
673 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
674
675 class SafepointBlob: public SingletonBlob {
676 friend class VMStructs;
677 private:
678 // Creation support
679 SafepointBlob(
680 CodeBuffer* cb,
681 int size,
682 OopMapSet* oop_maps,
683 int frame_size
684 );
685
686 public:
687 // Creation
688 static SafepointBlob* create(
689 CodeBuffer* cb,
690 OopMapSet* oop_maps,
691 int frame_size
692 );
693
694 // GC for args
695 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
696
697 // Typing
698 bool is_safepoint_stub() const { return true; }
699 };
700
701 #endif // SHARE_VM_CODE_CODEBLOB_HPP