1 /*
2 * Copyright (c) 1998, 2016, 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/macros.hpp"
34
35 // CodeBlob Types
36 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
37 struct CodeBlobType {
38 enum {
39 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
40 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
41 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
42 All = 3, // All types (No code cache segmentation)
43 AOT = 4, // AOT methods
44 NumTypes = 5 // Number of CodeBlobTypes
45 };
46 };
47
48 // CodeBlob - superclass for all entries in the CodeCache.
49 //
50 // Subtypes are:
51 // CompiledMethod : Compiled Java methods (include method that calls to native code)
52 // nmethod : JIT Compiled Java methods
53 // RuntimeBlob : Non-compiled method code; generated glue code
54 // RuntimeStub : Call to VM runtime methods
55 // DeoptimizationBlob : Used for deoptimization
56 // ExceptionBlob : Used for stack unrolling
57 // SafepointBlob : Used to handle illegal instruction exceptions
58 //
59 //
60 // Layout:
61 // - header
62 // - relocation
63 // - content space
64 // - instruction space
65 // - data space
66
67
68 class CodeBlobLayout;
69
70 class CodeBlob VALUE_OBJ_CLASS_SPEC {
71 friend class VMStructs;
72 friend class JVMCIVMStructs;
73 friend class CodeCacheDumper;
74
75 protected:
76
77 const CompilerType _type; // CompilerType
78 int _size; // total size of CodeBlob in bytes
79 int _header_size; // size of header (depends on subclass)
80 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
81 // not finished setting up their frame. Beware of pc's in
82 // that range. There is a similar range(s) on returns
83 // which we don't detect.
84 int _data_offset; // offset to where data region begins
85 int _frame_size; // size of stack frame
86
87 address _code_begin;
88 address _code_end;
89 address _content_begin; // address to where content region begins (this includes consts, insts, stubs)
90 // address _content_end - not required, for all CodeBlobs _code_end == _content_end for now
91 address _data_end;
92 address _relocation_begin;
93 address _relocation_end;
94
95 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
96 bool _caller_must_gc_arguments;
97 CodeStrings _strings;
98 const char* _name;
99 S390_ONLY(int _ctable_offset;)
100
101 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments);
102 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);
103 public:
104 // Returns the space needed for CodeBlob
105 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
106 static unsigned int align_code_offset(int offset);
107
108 // Deletion
109 virtual void flush();
110
111 // Typing
112 virtual bool is_buffer_blob() const { return false; }
113 virtual bool is_nmethod() const { return false; }
114 virtual bool is_runtime_stub() const { return false; }
115 virtual bool is_deoptimization_stub() const { return false; }
116 virtual bool is_uncommon_trap_stub() const { return false; }
117 virtual bool is_exception_stub() const { return false; }
118 virtual bool is_safepoint_stub() const { return false; }
119 virtual bool is_adapter_blob() const { return false; }
120 virtual bool is_method_handles_adapter_blob() const { return false; }
121 virtual bool is_aot() const { return false; }
122 virtual bool is_compiled() const { return false; }
123 virtual bool is_buffered_value_type_blob() const { return false; }
124
125 inline bool is_compiled_by_c1() const { return _type == compiler_c1; };
126 inline bool is_compiled_by_c2() const { return _type == compiler_c2; };
127 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; };
128 inline bool is_compiled_by_shark() const { return _type == compiler_shark; };
129 const char* compiler_name() const;
130
131 // Casting
132 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; }
133 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
134 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; }
135 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; }
136 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
137
138 // Boundaries
139 address header_begin() const { return (address) this; }
140 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; };
141 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; }
142 address content_begin() const { return _content_begin; }
143 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
144 address code_begin() const { return _code_begin; }
145 address code_end() const { return _code_end; }
146 address data_end() const { return _data_end; }
147
148 // This field holds the beginning of the const section in the old code buffer.
149 // It is needed to fix relocations of pc-relative loads when resizing the
150 // the constant pool or moving it.
151 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
152 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
153
154 // Sizes
155 int size() const { return _size; }
156 int header_size() const { return _header_size; }
157 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); }
158 int content_size() const { return content_end() - content_begin(); }
159 int code_size() const { return code_end() - code_begin(); }
160
161 // Containment
162 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
163 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
164 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
165 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
166 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
167
168 // CodeCache support: really only used by the nmethods, but in order to get
169 // asserts and certain bookkeeping to work in the CodeCache they are defined
170 // virtual here.
171 virtual bool is_zombie() const { return false; }
172 virtual bool is_locked_by_vm() const { return false; }
173
174 virtual bool is_unloaded() const { return false; }
175 virtual bool is_not_entrant() const { return false; }
176
177 // GC support
178 virtual bool is_alive() const = 0;
179
180 // OopMap for frame
181 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
182 void set_oop_maps(OopMapSet* p);
183 const ImmutableOopMap* oop_map_for_return_address(address return_address);
184 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
185
186 // Frame support
187 int frame_size() const { return _frame_size; }
188 void set_frame_size(int size) { _frame_size = size; }
189
190 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
191 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
192
193 // Naming
194 const char* name() const { return _name; }
195 void set_name(const char* name) { _name = name; }
196
197 // Debugging
198 virtual void verify() = 0;
199 virtual void print() const { print_on(tty); };
200 virtual void print_on(outputStream* st) const;
201 virtual void print_value_on(outputStream* st) const;
202 void print_code();
203
204 // Print the comment associated with offset on stream, if there is one
205 virtual void print_block_comment(outputStream* stream, address block_begin) const {
206 intptr_t offset = (intptr_t)(block_begin - code_begin());
207 _strings.print_block_comment(stream, offset);
208 }
209
210 // Transfer ownership of comments to this CodeBlob
211 void set_strings(CodeStrings& strings) {
212 assert(!is_aot(), "invalid on aot");
213 _strings.assign(strings);
214 }
215
216 static ByteSize name_field_offset() {
217 return byte_offset_of(CodeBlob, _name);
218 }
219
220 static ByteSize oop_maps_field_offset() {
221 return byte_offset_of(CodeBlob, _oop_maps);
222 }
223 };
224
225 class CodeBlobLayout : public StackObj {
226 private:
227 int _size;
228 int _header_size;
229 int _relocation_size;
230 int _content_offset;
231 int _code_offset;
232 int _data_offset;
233 address _code_begin;
234 address _code_end;
235 address _content_begin;
236 address _content_end;
237 address _data_end;
238 address _relocation_begin;
239 address _relocation_end;
240
241 public:
242 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
243 _size(0),
244 _header_size(0),
245 _relocation_size(0),
246 _content_offset(0),
247 _code_offset(0),
248 _data_offset(0),
249 _content_begin(content_begin),
250 _content_end(content_end),
251 _code_begin(code_begin),
252 _code_end(code_end),
253 _data_end(data_end),
254 _relocation_begin(relocation_begin),
255 _relocation_end(relocation_end)
256 {
257 }
258
259 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
260 _size(size),
261 _header_size(header_size),
262 _relocation_size(relocation_size),
263 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
264 _code_offset(_content_offset),
265 _data_offset(data_offset)
266 {
267 assert(_relocation_size == round_to(_relocation_size, oopSize), "unaligned size");
268
269 _code_begin = (address) start + _code_offset;
270 _code_end = (address) start + _data_offset;
271
272 _content_begin = (address) start + _content_offset;
273 _content_end = (address) start + _data_offset;
274
275 _data_end = (address) start + _size;
276 _relocation_begin = (address) start + _header_size;
277 _relocation_end = _relocation_begin + _relocation_size;
278 }
279
280 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
281 _size(size),
282 _header_size(header_size),
283 _relocation_size(round_to(cb->total_relocation_size(), oopSize)),
284 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
285 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
286 _data_offset(_content_offset + round_to(cb->total_content_size(), oopSize))
287 {
288 assert(_relocation_size == round_to(_relocation_size, oopSize), "unaligned size");
289
290 _code_begin = (address) start + _code_offset;
291 _code_end = (address) start + _data_offset;
292
293 _content_begin = (address) start + _content_offset;
294 _content_end = (address) start + _data_offset;
295
296 _data_end = (address) start + _size;
297 _relocation_begin = (address) start + _header_size;
298 _relocation_end = _relocation_begin + _relocation_size;
299 }
300
301 int size() const { return _size; }
302 int header_size() const { return _header_size; }
303 int relocation_size() const { return _relocation_size; }
304 int content_offset() const { return _content_offset; }
305 int code_offset() const { return _code_offset; }
306 int data_offset() const { return _data_offset; }
307 address code_begin() const { return _code_begin; }
308 address code_end() const { return _code_end; }
309 address data_end() const { return _data_end; }
310 address relocation_begin() const { return _relocation_begin; }
311 address relocation_end() const { return _relocation_end; }
312 address content_begin() const { return _content_begin; }
313 address content_end() const { return _content_end; }
314 };
315
316
317 class RuntimeBlob : public CodeBlob {
318 friend class VMStructs;
319 public:
320
321 // Creation
322 // a) simple CodeBlob
323 // frame_complete is the offset from the beginning of the instructions
324 // to where the frame setup (from stackwalk viewpoint) is complete.
325 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
326
327 // b) full CodeBlob
328 RuntimeBlob(
329 const char* name,
330 CodeBuffer* cb,
331 int header_size,
332 int size,
333 int frame_complete,
334 int frame_size,
335 OopMapSet* oop_maps,
336 bool caller_must_gc_arguments = false
337 );
338
339 // GC support
340 virtual bool is_alive() const = 0;
341
342 void verify();
343
344 // OopMap for frame
345 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
346
347 // Debugging
348 void print() const { print_on(tty); }
349 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
350 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
351
352 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
353 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
354 };
355
356 class WhiteBox;
357 //----------------------------------------------------------------------------------------------------
358 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
359
360 class BufferBlob: public RuntimeBlob {
361 friend class VMStructs;
362 friend class AdapterBlob;
363 friend class MethodHandlesAdapterBlob;
364 friend class BufferedValueTypeBlob;
365 friend class WhiteBox;
366
367 private:
368 // Creation support
369 BufferBlob(const char* name, int size);
370 BufferBlob(const char* name, int size, CodeBuffer* cb);
371 BufferBlob(const char* name, int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps);
372
373 void* operator new(size_t s, unsigned size) throw();
374
375 public:
376 // Creation
377 static BufferBlob* create(const char* name, int buffer_size);
378 static BufferBlob* create(const char* name, CodeBuffer* cb);
379
380 static void free(BufferBlob* buf);
381
382 // Typing
383 virtual bool is_buffer_blob() const { return true; }
384
385 // GC/Verification support
386 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
387 bool is_alive() const { return true; }
388
389 void verify();
390 void print_on(outputStream* st) const;
391 void print_value_on(outputStream* st) const;
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, int frame_complete, int frame_size, OopMapSet* oop_maps);
401
402 public:
403 // Creation
404 static AdapterBlob* create(CodeBuffer* cb,
405 int frame_complete,
406 int frame_size,
407 OopMapSet* oop_maps);
408
409 // Typing
410 virtual bool is_adapter_blob() const { return true; }
411
412 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
413 };
414
415
416 //----------------------------------------------------------------------------------------------------
417 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
418
419 class MethodHandlesAdapterBlob: public BufferBlob {
420 private:
421 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
422
423 public:
424 // Creation
425 static MethodHandlesAdapterBlob* create(int buffer_size);
426
427 // Typing
428 virtual bool is_method_handles_adapter_blob() const { return true; }
429 };
430
431 //----------------------------------------------------------------------------------------------------
432 // BufferedValueTypeBlob : used for pack/unpack handlers
433
434 class BufferedValueTypeBlob: public BufferBlob {
435 private:
436 const int _pack_fields_off;
437 const int _unpack_fields_off;
438
439 BufferedValueTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int unpack_fields_off);
440
441 public:
442 // Creation
443 static BufferedValueTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int unpack_fields_off);
444
445 address pack_fields() const { return code_begin() + _pack_fields_off; }
446 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
447
448 // Typing
449 virtual bool is_buffered_value_type_blob() const { return true; }
450 };
451
452 //----------------------------------------------------------------------------------------------------
453 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
454
455 class RuntimeStub: public RuntimeBlob {
456 friend class VMStructs;
457 private:
458 // Creation support
459 RuntimeStub(
460 const char* name,
461 CodeBuffer* cb,
462 int size,
463 int frame_complete,
464 int frame_size,
465 OopMapSet* oop_maps,
466 bool caller_must_gc_arguments
467 );
468
469 void* operator new(size_t s, unsigned size) throw();
470
471 public:
472 // Creation
473 static RuntimeStub* new_runtime_stub(
474 const char* stub_name,
475 CodeBuffer* cb,
476 int frame_complete,
477 int frame_size,
478 OopMapSet* oop_maps,
479 bool caller_must_gc_arguments
480 );
481
482 // Typing
483 bool is_runtime_stub() const { return true; }
484
485 address entry_point() const { return code_begin(); }
486
487 // GC/Verification support
488 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
489 bool is_alive() const { return true; }
490
491 void verify();
492 void print_on(outputStream* st) const;
493 void print_value_on(outputStream* st) const;
494 };
495
496
497 //----------------------------------------------------------------------------------------------------
498 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
499
500 class SingletonBlob: public RuntimeBlob {
501 friend class VMStructs;
502
503 protected:
504 void* operator new(size_t s, unsigned size) throw();
505
506 public:
507 SingletonBlob(
508 const char* name,
509 CodeBuffer* cb,
510 int header_size,
511 int size,
512 int frame_size,
513 OopMapSet* oop_maps
514 )
515 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
516 {};
517
518 address entry_point() { return code_begin(); }
519
520 bool is_alive() const { return true; }
521
522 // GC/Verification support
523 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
524 void verify(); // does nothing
525 void print_on(outputStream* st) const;
526 void print_value_on(outputStream* st) const;
527 };
528
529
530 //----------------------------------------------------------------------------------------------------
531 // DeoptimizationBlob
532
533 class DeoptimizationBlob: public SingletonBlob {
534 friend class VMStructs;
535 friend class JVMCIVMStructs;
536 private:
537 int _unpack_offset;
538 int _unpack_with_exception;
539 int _unpack_with_reexecution;
540
541 int _unpack_with_exception_in_tls;
542
543 #if INCLUDE_JVMCI
544 // Offsets when JVMCI calls uncommon_trap.
545 int _uncommon_trap_offset;
546 int _implicit_exception_uncommon_trap_offset;
547 #endif
548
549 // Creation support
550 DeoptimizationBlob(
551 CodeBuffer* cb,
552 int size,
553 OopMapSet* oop_maps,
554 int unpack_offset,
555 int unpack_with_exception_offset,
556 int unpack_with_reexecution_offset,
557 int frame_size
558 );
559
560 public:
561 // Creation
562 static DeoptimizationBlob* create(
563 CodeBuffer* cb,
564 OopMapSet* oop_maps,
565 int unpack_offset,
566 int unpack_with_exception_offset,
567 int unpack_with_reexecution_offset,
568 int frame_size
569 );
570
571 // Typing
572 bool is_deoptimization_stub() const { return true; }
573 bool exception_address_is_unpack_entry(address pc) const {
574 address unpack_pc = unpack();
575 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
576 }
577
578 // GC for args
579 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
580
581 // Printing
582 void print_value_on(outputStream* st) const;
583
584 address unpack() const { return code_begin() + _unpack_offset; }
585 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
586 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
587
588 // Alternate entry point for C1 where the exception and issuing pc
589 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
590 // instead of being in registers. This is needed because C1 doesn't
591 // model exception paths in a way that keeps these registers free so
592 // there may be live values in those registers during deopt.
593 void set_unpack_with_exception_in_tls_offset(int offset) {
594 _unpack_with_exception_in_tls = offset;
595 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
596 }
597 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
598
599 #if INCLUDE_JVMCI
600 // Offsets when JVMCI calls uncommon_trap.
601 void set_uncommon_trap_offset(int offset) {
602 _uncommon_trap_offset = offset;
603 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
604 }
605 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
606
607 void set_implicit_exception_uncommon_trap_offset(int offset) {
608 _implicit_exception_uncommon_trap_offset = offset;
609 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
610 }
611 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
612 #endif // INCLUDE_JVMCI
613 };
614
615
616 //----------------------------------------------------------------------------------------------------
617 // UncommonTrapBlob (currently only used by Compiler 2)
618
619 #ifdef COMPILER2
620
621 class UncommonTrapBlob: public SingletonBlob {
622 friend class VMStructs;
623 private:
624 // Creation support
625 UncommonTrapBlob(
626 CodeBuffer* cb,
627 int size,
628 OopMapSet* oop_maps,
629 int frame_size
630 );
631
632 public:
633 // Creation
634 static UncommonTrapBlob* create(
635 CodeBuffer* cb,
636 OopMapSet* oop_maps,
637 int frame_size
638 );
639
640 // GC for args
641 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
642
643 // Typing
644 bool is_uncommon_trap_stub() const { return true; }
645 };
646
647
648 //----------------------------------------------------------------------------------------------------
649 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
650
651 class ExceptionBlob: public SingletonBlob {
652 friend class VMStructs;
653 private:
654 // Creation support
655 ExceptionBlob(
656 CodeBuffer* cb,
657 int size,
658 OopMapSet* oop_maps,
659 int frame_size
660 );
661
662 public:
663 // Creation
664 static ExceptionBlob* create(
665 CodeBuffer* cb,
666 OopMapSet* oop_maps,
667 int frame_size
668 );
669
670 // GC for args
671 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
672
673 // Typing
674 bool is_exception_stub() const { return true; }
675 };
676 #endif // COMPILER2
677
678
679 //----------------------------------------------------------------------------------------------------
680 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
681
682 class SafepointBlob: public SingletonBlob {
683 friend class VMStructs;
684 private:
685 // Creation support
686 SafepointBlob(
687 CodeBuffer* cb,
688 int size,
689 OopMapSet* oop_maps,
690 int frame_size
691 );
692
693 public:
694 // Creation
695 static SafepointBlob* create(
696 CodeBuffer* cb,
697 OopMapSet* oop_maps,
698 int frame_size
699 );
700
701 // GC for args
702 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
703
704 // Typing
705 bool is_safepoint_stub() const { return true; }
706 };
707
708 #endif // SHARE_VM_CODE_CODEBLOB_HPP