1 /*
2 * Copyright (c) 1998, 2019, 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/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 // VtableBlob : Used for holding vtable chunks
62 // MethodHandlesAdapterBlob : Used to hold MethodHandles adapters
63 // RuntimeStub : Call to VM runtime methods
64 // SingletonBlob : Super-class for all blobs that exist in only one instance
65 // DeoptimizationBlob : Used for deoptimization
66 // ExceptionBlob : Used for stack unrolling
67 // SafepointBlob : Used to handle illegal instruction exceptions
68 // UncommonTrapBlob : Used to handle uncommon traps
69 //
70 //
71 // Layout (all except AOTCompiledMethod) : continuous in the CodeCache
72 // - header
73 // - relocation
74 // - content space
75 // - instruction space
76 // - data space
77 //
78 // Layout (AOTCompiledMethod) : in the C-Heap
79 // - header -\
80 // ... |
81 // - code <-/
82
83
84 class CodeBlobLayout;
85
86 class CodeBlob {
87 friend class VMStructs;
88 friend class JVMCIVMStructs;
89 friend class CodeCacheDumper;
90
91 protected:
92
93 const CompilerType _type; // CompilerType
94 int _size; // total size of CodeBlob in bytes
95 int _header_size; // size of header (depends on subclass)
96 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
97 // not finished setting up their frame. Beware of pc's in
98 // that range. There is a similar range(s) on returns
99 // which we don't detect.
100 int _data_offset; // offset to where data region begins
101 int _frame_size; // size of stack frame
102
103 address _code_begin;
104 address _code_end;
105 address _content_begin; // address to where content region begins (this includes consts, insts, stubs)
106 // address _content_end - not required, for all CodeBlobs _code_end == _content_end for now
107 address _data_end;
108 address _relocation_begin;
109 address _relocation_end;
110
111 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
112 bool _caller_must_gc_arguments;
113 CodeStrings _strings;
114 const char* _name;
115 S390_ONLY(int _ctable_offset;)
116
117 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments);
118 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);
119
120 public:
121 // Only used by unit test.
122 CodeBlob()
123 : _type(compiler_none) {}
124
125 // Returns the space needed for CodeBlob
126 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
127 static unsigned int align_code_offset(int offset);
128
129 // Deletion
130 virtual void flush();
131
132 // Typing
133 virtual bool is_buffer_blob() const { return false; }
134 virtual bool is_nmethod() const { return false; }
135 virtual bool is_runtime_stub() const { return false; }
136 virtual bool is_deoptimization_stub() const { return false; }
137 virtual bool is_uncommon_trap_stub() const { return false; }
138 virtual bool is_exception_stub() const { return false; }
139 virtual bool is_safepoint_stub() const { return false; }
140 virtual bool is_adapter_blob() const { return false; }
141 virtual bool is_vtable_blob() const { return false; }
142 virtual bool is_method_handles_adapter_blob() const { return false; }
143 virtual bool is_aot() const { return false; }
144 virtual bool is_compiled() const { return false; }
145
146 inline bool is_compiled_by_c1() const { return _type == compiler_c1; };
147 inline bool is_compiled_by_c2() const { return _type == compiler_c2; };
148 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; };
149 const char* compiler_name() const;
150
151 // Casting
152 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; }
153 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
154 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; }
155 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; }
156 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
157
158 // Boundaries
159 address header_begin() const { return (address) this; }
160 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; };
161 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; }
162 address content_begin() const { return _content_begin; }
163 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
164 address code_begin() const { return _code_begin; }
165 address code_end() const { return _code_end; }
166 address data_end() const { return _data_end; }
167
168 // This field holds the beginning of the const section in the old code buffer.
169 // It is needed to fix relocations of pc-relative loads when resizing the
170 // the constant pool or moving it.
171 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
172 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
173
174 // Sizes
175 int size() const { return _size; }
176 int header_size() const { return _header_size; }
177 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); }
178 int content_size() const { return content_end() - content_begin(); }
179 int code_size() const { return code_end() - code_begin(); }
180 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
181 void adjust_size(size_t used) {
182 _size = (int)used;
183 _data_offset = (int)used;
184 _code_end = (address)this + used;
185 _data_end = (address)this + used;
186 }
187
188 // Containment
189 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
190 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
191 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
192 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
193 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
194 int frame_complete_offset() const { return _frame_complete_offset; }
195
196 // CodeCache support: really only used by the nmethods, but in order to get
197 // asserts and certain bookkeeping to work in the CodeCache they are defined
198 // virtual here.
199 virtual bool is_zombie() const { return false; }
200 virtual bool is_locked_by_vm() const { return false; }
201
202 virtual bool is_unloaded() const { return false; }
203 virtual bool is_not_entrant() const { return false; }
204
205 // GC support
206 virtual bool is_alive() const = 0;
207
208 // OopMap for frame
209 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
210 void set_oop_maps(OopMapSet* p);
211 const ImmutableOopMap* oop_map_for_return_address(address return_address);
212 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
213
214 // Frame support
215 int frame_size() const { return _frame_size; }
216 void set_frame_size(int size) { _frame_size = size; }
217
218 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
219 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
220
221 // Naming
222 const char* name() const { return _name; }
223 void set_name(const char* name) { _name = name; }
224
225 // Debugging
226 virtual void verify() = 0;
227 virtual void print() const { print_on(tty); };
228 virtual void print_on(outputStream* st) const;
229 virtual void print_value_on(outputStream* st) const;
230 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
231 void print_code();
232
233 // Print the comment associated with offset on stream, if there is one
234 virtual void print_block_comment(outputStream* stream, address block_begin) const {
235 intptr_t offset = (intptr_t)(block_begin - code_begin());
236 _strings.print_block_comment(stream, offset);
237 }
238
239 // Transfer ownership of comments to this CodeBlob
240 void set_strings(CodeStrings& strings) {
241 assert(!is_aot(), "invalid on aot");
242 _strings.assign(strings);
243 }
244
245 static ByteSize name_field_offset() {
246 return byte_offset_of(CodeBlob, _name);
247 }
248
249 static ByteSize oop_maps_field_offset() {
250 return byte_offset_of(CodeBlob, _oop_maps);
251 }
252 };
253
254 class CodeBlobLayout : public StackObj {
255 private:
256 int _size;
257 int _header_size;
258 int _relocation_size;
259 int _content_offset;
260 int _code_offset;
261 int _data_offset;
262 address _code_begin;
263 address _code_end;
264 address _content_begin;
265 address _content_end;
266 address _data_end;
267 address _relocation_begin;
268 address _relocation_end;
269
270 public:
271 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
272 _size(0),
273 _header_size(0),
274 _relocation_size(0),
275 _content_offset(0),
276 _code_offset(0),
277 _data_offset(0),
278 _code_begin(code_begin),
279 _code_end(code_end),
280 _content_begin(content_begin),
281 _content_end(content_end),
282 _data_end(data_end),
283 _relocation_begin(relocation_begin),
284 _relocation_end(relocation_end)
285 {
286 }
287
288 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
289 _size(size),
290 _header_size(header_size),
291 _relocation_size(relocation_size),
292 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
293 _code_offset(_content_offset),
294 _data_offset(data_offset)
295 {
296 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
297
298 _code_begin = (address) start + _code_offset;
299 _code_end = (address) start + _data_offset;
300
301 _content_begin = (address) start + _content_offset;
302 _content_end = (address) start + _data_offset;
303
304 _data_end = (address) start + _size;
305 _relocation_begin = (address) start + _header_size;
306 _relocation_end = _relocation_begin + _relocation_size;
307 }
308
309 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
310 _size(size),
311 _header_size(header_size),
312 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
313 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
314 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
315 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize))
316 {
317 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
318
319 _code_begin = (address) start + _code_offset;
320 _code_end = (address) start + _data_offset;
321
322 _content_begin = (address) start + _content_offset;
323 _content_end = (address) start + _data_offset;
324
325 _data_end = (address) start + _size;
326 _relocation_begin = (address) start + _header_size;
327 _relocation_end = _relocation_begin + _relocation_size;
328 }
329
330 int size() const { return _size; }
331 int header_size() const { return _header_size; }
332 int relocation_size() const { return _relocation_size; }
333 int content_offset() const { return _content_offset; }
334 int code_offset() const { return _code_offset; }
335 int data_offset() const { return _data_offset; }
336 address code_begin() const { return _code_begin; }
337 address code_end() const { return _code_end; }
338 address data_end() const { return _data_end; }
339 address relocation_begin() const { return _relocation_begin; }
340 address relocation_end() const { return _relocation_end; }
341 address content_begin() const { return _content_begin; }
342 address content_end() const { return _content_end; }
343 };
344
345
346 class RuntimeBlob : public CodeBlob {
347 friend class VMStructs;
348 public:
349
350 // Creation
351 // a) simple CodeBlob
352 // frame_complete is the offset from the beginning of the instructions
353 // to where the frame setup (from stackwalk viewpoint) is complete.
354 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
355
356 // b) full CodeBlob
357 RuntimeBlob(
358 const char* name,
359 CodeBuffer* cb,
360 int header_size,
361 int size,
362 int frame_complete,
363 int frame_size,
364 OopMapSet* oop_maps,
365 bool caller_must_gc_arguments = false
366 );
367
368 // GC support
369 virtual bool is_alive() const = 0;
370
371 void verify();
372
373 // OopMap for frame
374 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
375
376 // Debugging
377 void print() const { print_on(tty); }
378 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
379 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
380
381 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
382 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
383 };
384
385 class WhiteBox;
386 //----------------------------------------------------------------------------------------------------
387 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
388
389 class BufferBlob: public RuntimeBlob {
390 friend class VMStructs;
391 friend class AdapterBlob;
392 friend class VtableBlob;
393 friend class MethodHandlesAdapterBlob;
394 friend class WhiteBox;
395
396 private:
397 // Creation support
398 BufferBlob(const char* name, int size);
399 BufferBlob(const char* name, int size, CodeBuffer* cb);
400
401 // This ordinary operator delete is needed even though not used, so the
402 // below two-argument operator delete will be treated as a placement
403 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
404 void operator delete(void* p);
405 void* operator new(size_t s, unsigned size) throw();
406
407 public:
408 // Creation
409 static BufferBlob* create(const char* name, int buffer_size);
410 static BufferBlob* create(const char* name, CodeBuffer* cb);
411
412 static void free(BufferBlob* buf);
413
414 // Typing
415 virtual bool is_buffer_blob() const { return true; }
416
417 // GC/Verification support
418 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
419 bool is_alive() const { return true; }
420
421 void verify();
422 void print_on(outputStream* st) const;
423 void print_value_on(outputStream* st) const;
424 };
425
426
427 //----------------------------------------------------------------------------------------------------
428 // AdapterBlob: used to hold C2I/I2C adapters
429
430 class AdapterBlob: public BufferBlob {
431 private:
432 AdapterBlob(int size, CodeBuffer* cb);
433
434 public:
435 // Creation
436 static AdapterBlob* create(CodeBuffer* cb);
437
438 // Typing
439 virtual bool is_adapter_blob() const { return true; }
440 };
441
442 //---------------------------------------------------------------------------------------------------
443 class VtableBlob: public BufferBlob {
444 private:
445 VtableBlob(const char*, int);
446
447 public:
448 // Creation
449 static VtableBlob* create(const char* name, int buffer_size);
450
451 // Typing
452 virtual bool is_vtable_blob() const { return true; }
453 };
454
455 //----------------------------------------------------------------------------------------------------
456 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
457
458 class MethodHandlesAdapterBlob: public BufferBlob {
459 private:
460 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
461
462 public:
463 // Creation
464 static MethodHandlesAdapterBlob* create(int buffer_size);
465
466 // Typing
467 virtual bool is_method_handles_adapter_blob() const { return true; }
468 };
469
470
471 //----------------------------------------------------------------------------------------------------
472 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
473
474 class RuntimeStub: public RuntimeBlob {
475 friend class VMStructs;
476 private:
477 // Creation support
478 RuntimeStub(
479 const char* name,
480 CodeBuffer* cb,
481 int size,
482 int frame_complete,
483 int frame_size,
484 OopMapSet* oop_maps,
485 bool caller_must_gc_arguments
486 );
487
488 // This ordinary operator delete is needed even though not used, so the
489 // below two-argument operator delete will be treated as a placement
490 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
491 void operator delete(void* p);
492 void* operator new(size_t s, unsigned size) throw();
493
494 public:
495 // Creation
496 static RuntimeStub* new_runtime_stub(
497 const char* stub_name,
498 CodeBuffer* cb,
499 int frame_complete,
500 int frame_size,
501 OopMapSet* oop_maps,
502 bool caller_must_gc_arguments
503 );
504
505 // Typing
506 bool is_runtime_stub() const { return true; }
507
508 address entry_point() const { return code_begin(); }
509
510 // GC/Verification support
511 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
512 bool is_alive() const { return true; }
513
514 void verify();
515 void print_on(outputStream* st) const;
516 void print_value_on(outputStream* st) const;
517 };
518
519
520 //----------------------------------------------------------------------------------------------------
521 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
522
523 class SingletonBlob: public RuntimeBlob {
524 friend class VMStructs;
525
526 protected:
527 // This ordinary operator delete is needed even though not used, so the
528 // below two-argument operator delete will be treated as a placement
529 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
530 void operator delete(void* p);
531 void* operator new(size_t s, unsigned size) throw();
532
533 public:
534 SingletonBlob(
535 const char* name,
536 CodeBuffer* cb,
537 int header_size,
538 int size,
539 int frame_size,
540 OopMapSet* oop_maps
541 )
542 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
543 {};
544
545 address entry_point() { return code_begin(); }
546
547 bool is_alive() const { return true; }
548
549 // GC/Verification support
550 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
551 void verify(); // does nothing
552 void print_on(outputStream* st) const;
553 void print_value_on(outputStream* st) const;
554 };
555
556
557 //----------------------------------------------------------------------------------------------------
558 // DeoptimizationBlob
559
560 class DeoptimizationBlob: public SingletonBlob {
561 friend class VMStructs;
562 friend class JVMCIVMStructs;
563 private:
564 int _unpack_offset;
565 int _unpack_with_exception;
566 int _unpack_with_reexecution;
567
568 int _unpack_with_exception_in_tls;
569
570 #if INCLUDE_JVMCI
571 // Offsets when JVMCI calls uncommon_trap.
572 int _uncommon_trap_offset;
573 int _implicit_exception_uncommon_trap_offset;
574 #endif
575
576 // Creation support
577 DeoptimizationBlob(
578 CodeBuffer* cb,
579 int size,
580 OopMapSet* oop_maps,
581 int unpack_offset,
582 int unpack_with_exception_offset,
583 int unpack_with_reexecution_offset,
584 int frame_size
585 );
586
587 public:
588 // Creation
589 static DeoptimizationBlob* create(
590 CodeBuffer* cb,
591 OopMapSet* oop_maps,
592 int unpack_offset,
593 int unpack_with_exception_offset,
594 int unpack_with_reexecution_offset,
595 int frame_size
596 );
597
598 // Typing
599 bool is_deoptimization_stub() const { return true; }
600 bool exception_address_is_unpack_entry(address pc) const {
601 address unpack_pc = unpack();
602 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
603 }
604
605 // GC for args
606 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
607
608 // Printing
609 void print_value_on(outputStream* st) const;
610
611 address unpack() const { return code_begin() + _unpack_offset; }
612 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
613 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
614
615 // Alternate entry point for C1 where the exception and issuing pc
616 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
617 // instead of being in registers. This is needed because C1 doesn't
618 // model exception paths in a way that keeps these registers free so
619 // there may be live values in those registers during deopt.
620 void set_unpack_with_exception_in_tls_offset(int offset) {
621 _unpack_with_exception_in_tls = offset;
622 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
623 }
624 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
625
626 #if INCLUDE_JVMCI
627 // Offsets when JVMCI calls uncommon_trap.
628 void set_uncommon_trap_offset(int offset) {
629 _uncommon_trap_offset = offset;
630 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
631 }
632 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
633
634 void set_implicit_exception_uncommon_trap_offset(int offset) {
635 _implicit_exception_uncommon_trap_offset = offset;
636 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
637 }
638 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
639 #endif // INCLUDE_JVMCI
640 };
641
642
643 //----------------------------------------------------------------------------------------------------
644 // UncommonTrapBlob (currently only used by Compiler 2)
645
646 #ifdef COMPILER2
647
648 class UncommonTrapBlob: public SingletonBlob {
649 friend class VMStructs;
650 private:
651 // Creation support
652 UncommonTrapBlob(
653 CodeBuffer* cb,
654 int size,
655 OopMapSet* oop_maps,
656 int frame_size
657 );
658
659 public:
660 // Creation
661 static UncommonTrapBlob* create(
662 CodeBuffer* cb,
663 OopMapSet* oop_maps,
664 int frame_size
665 );
666
667 // GC for args
668 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
669
670 // Typing
671 bool is_uncommon_trap_stub() const { return true; }
672 };
673
674
675 //----------------------------------------------------------------------------------------------------
676 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
677
678 class ExceptionBlob: public SingletonBlob {
679 friend class VMStructs;
680 private:
681 // Creation support
682 ExceptionBlob(
683 CodeBuffer* cb,
684 int size,
685 OopMapSet* oop_maps,
686 int frame_size
687 );
688
689 public:
690 // Creation
691 static ExceptionBlob* create(
692 CodeBuffer* cb,
693 OopMapSet* oop_maps,
694 int frame_size
695 );
696
697 // GC for args
698 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
699
700 // Typing
701 bool is_exception_stub() const { return true; }
702 };
703 #endif // COMPILER2
704
705
706 //----------------------------------------------------------------------------------------------------
707 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
708
709 class SafepointBlob: public SingletonBlob {
710 friend class VMStructs;
711 private:
712 // Creation support
713 SafepointBlob(
714 CodeBuffer* cb,
715 int size,
716 OopMapSet* oop_maps,
717 int frame_size
718 );
719
720 public:
721 // Creation
722 static SafepointBlob* create(
723 CodeBuffer* cb,
724 OopMapSet* oop_maps,
725 int frame_size
726 );
727
728 // GC for args
729 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
730
731 // Typing
732 bool is_safepoint_stub() const { return true; }
733 };
734
735 #endif // SHARE_CODE_CODEBLOB_HPP