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. Sizes are in word units.
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;
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 bool has_block_comment(address block_begin) const {
234 intptr_t offset = (intptr_t)(block_begin - code_begin());
235 return _strings.has_block_comment(offset);
236 }
237 // Print the comment associated with offset on stream, if there is one
238 virtual void print_block_comment(outputStream* stream, address block_begin) const {
239 intptr_t offset = (intptr_t)(block_begin - code_begin());
240 _strings.print_block_comment(stream, offset);
241 }
242
243 // Transfer ownership of comments to this CodeBlob
244 void set_strings(CodeStrings& strings) {
245 assert(!is_aot(), "invalid on aot");
246 _strings.assign(strings);
247 }
248
249 static ByteSize name_field_offset() {
250 return byte_offset_of(CodeBlob, _name);
251 }
252
253 static ByteSize oop_maps_field_offset() {
254 return byte_offset_of(CodeBlob, _oop_maps);
255 }
256 };
257
258 class CodeBlobLayout : public StackObj {
259 private:
260 int _size;
261 int _header_size;
262 int _relocation_size;
263 int _content_offset;
264 int _code_offset;
265 int _data_offset;
266 address _code_begin;
267 address _code_end;
268 address _content_begin;
269 address _content_end;
270 address _data_end;
271 address _relocation_begin;
272 address _relocation_end;
273
274 public:
275 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
276 _size(0),
277 _header_size(0),
278 _relocation_size(0),
279 _content_offset(0),
280 _code_offset(0),
281 _data_offset(0),
282 _code_begin(code_begin),
283 _code_end(code_end),
284 _content_begin(content_begin),
285 _content_end(content_end),
286 _data_end(data_end),
287 _relocation_begin(relocation_begin),
288 _relocation_end(relocation_end)
289 {
290 }
291
292 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
293 _size(size),
294 _header_size(header_size),
295 _relocation_size(relocation_size),
296 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
297 _code_offset(_content_offset),
298 _data_offset(data_offset)
299 {
300 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
301
302 _code_begin = (address) start + _code_offset;
303 _code_end = (address) start + _data_offset;
304
305 _content_begin = (address) start + _content_offset;
306 _content_end = (address) start + _data_offset;
307
308 _data_end = (address) start + _size;
309 _relocation_begin = (address) start + _header_size;
310 _relocation_end = _relocation_begin + _relocation_size;
311 }
312
313 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
314 _size(size),
315 _header_size(header_size),
316 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
317 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
318 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
319 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize))
320 {
321 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
322
323 _code_begin = (address) start + _code_offset;
324 _code_end = (address) start + _data_offset;
325
326 _content_begin = (address) start + _content_offset;
327 _content_end = (address) start + _data_offset;
328
329 _data_end = (address) start + _size;
330 _relocation_begin = (address) start + _header_size;
331 _relocation_end = _relocation_begin + _relocation_size;
332 }
333
334 int size() const { return _size; }
335 int header_size() const { return _header_size; }
336 int relocation_size() const { return _relocation_size; }
337 int content_offset() const { return _content_offset; }
338 int code_offset() const { return _code_offset; }
339 int data_offset() const { return _data_offset; }
340 address code_begin() const { return _code_begin; }
341 address code_end() const { return _code_end; }
342 address data_end() const { return _data_end; }
343 address relocation_begin() const { return _relocation_begin; }
344 address relocation_end() const { return _relocation_end; }
345 address content_begin() const { return _content_begin; }
346 address content_end() const { return _content_end; }
347 };
348
349
350 class RuntimeBlob : public CodeBlob {
351 friend class VMStructs;
352 public:
353
354 // Creation
355 // a) simple CodeBlob
356 // frame_complete is the offset from the beginning of the instructions
357 // to where the frame setup (from stackwalk viewpoint) is complete.
358 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
359
360 // b) full CodeBlob
361 RuntimeBlob(
362 const char* name,
363 CodeBuffer* cb,
364 int header_size,
365 int size,
366 int frame_complete,
367 int frame_size,
368 OopMapSet* oop_maps,
369 bool caller_must_gc_arguments = false
370 );
371
372 // GC support
373 virtual bool is_alive() const = 0;
374
375 void verify();
376
377 // OopMap for frame
378 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
379
380 // Debugging
381 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
382 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
383
384 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
385 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
386 };
387
388 class WhiteBox;
389 //----------------------------------------------------------------------------------------------------
390 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
391
392 class BufferBlob: public RuntimeBlob {
393 friend class VMStructs;
394 friend class AdapterBlob;
395 friend class VtableBlob;
396 friend class MethodHandlesAdapterBlob;
397 friend class WhiteBox;
398
399 private:
400 // Creation support
401 BufferBlob(const char* name, int size);
402 BufferBlob(const char* name, int size, CodeBuffer* cb);
403
404 // This ordinary operator delete is needed even though not used, so the
405 // below two-argument operator delete will be treated as a placement
406 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
407 void operator delete(void* p);
408 void* operator new(size_t s, unsigned size) throw();
409
410 public:
411 // Creation
412 static BufferBlob* create(const char* name, int buffer_size);
413 static BufferBlob* create(const char* name, CodeBuffer* cb);
414
415 static void free(BufferBlob* buf);
416
417 // Typing
418 virtual bool is_buffer_blob() const { return true; }
419
420 // GC/Verification support
421 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
422 bool is_alive() const { return true; }
423
424 void verify();
425 void print_on(outputStream* st) const;
426 void print_value_on(outputStream* st) const;
427 };
428
429
430 //----------------------------------------------------------------------------------------------------
431 // AdapterBlob: used to hold C2I/I2C adapters
432
433 class AdapterBlob: public BufferBlob {
434 private:
435 AdapterBlob(int size, CodeBuffer* cb);
436
437 public:
438 // Creation
439 static AdapterBlob* create(CodeBuffer* cb);
440
441 // Typing
442 virtual bool is_adapter_blob() const { return true; }
443 };
444
445 //---------------------------------------------------------------------------------------------------
446 class VtableBlob: public BufferBlob {
447 private:
448 VtableBlob(const char*, int);
449
450 public:
451 // Creation
452 static VtableBlob* create(const char* name, int buffer_size);
453
454 // Typing
455 virtual bool is_vtable_blob() const { return true; }
456 };
457
458 //----------------------------------------------------------------------------------------------------
459 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
460
461 class MethodHandlesAdapterBlob: public BufferBlob {
462 private:
463 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
464
465 public:
466 // Creation
467 static MethodHandlesAdapterBlob* create(int buffer_size);
468
469 // Typing
470 virtual bool is_method_handles_adapter_blob() const { return true; }
471 };
472
473
474 //----------------------------------------------------------------------------------------------------
475 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
476
477 class RuntimeStub: public RuntimeBlob {
478 friend class VMStructs;
479 private:
480 // Creation support
481 RuntimeStub(
482 const char* name,
483 CodeBuffer* cb,
484 int size,
485 int frame_complete,
486 int frame_size,
487 OopMapSet* oop_maps,
488 bool caller_must_gc_arguments
489 );
490
491 // This ordinary operator delete is needed even though not used, so the
492 // below two-argument operator delete will be treated as a placement
493 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
494 void operator delete(void* p);
495 void* operator new(size_t s, unsigned size) throw();
496
497 public:
498 // Creation
499 static RuntimeStub* new_runtime_stub(
500 const char* stub_name,
501 CodeBuffer* cb,
502 int frame_complete,
503 int frame_size,
504 OopMapSet* oop_maps,
505 bool caller_must_gc_arguments
506 );
507
508 // Typing
509 bool is_runtime_stub() const { return true; }
510
511 address entry_point() const { return code_begin(); }
512
513 // GC/Verification support
514 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
515 bool is_alive() const { return true; }
516
517 void verify();
518 void print_on(outputStream* st) const;
519 void print_value_on(outputStream* st) const;
520 };
521
522
523 //----------------------------------------------------------------------------------------------------
524 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
525
526 class SingletonBlob: public RuntimeBlob {
527 friend class VMStructs;
528
529 protected:
530 // This ordinary operator delete is needed even though not used, so the
531 // below two-argument operator delete will be treated as a placement
532 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
533 void operator delete(void* p);
534 void* operator new(size_t s, unsigned size) throw();
535
536 public:
537 SingletonBlob(
538 const char* name,
539 CodeBuffer* cb,
540 int header_size,
541 int size,
542 int frame_size,
543 OopMapSet* oop_maps
544 )
545 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
546 {};
547
548 address entry_point() { return code_begin(); }
549
550 bool is_alive() const { return true; }
551
552 // GC/Verification support
553 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
554 void verify(); // does nothing
555 void print_on(outputStream* st) const;
556 void print_value_on(outputStream* st) const;
557 };
558
559
560 //----------------------------------------------------------------------------------------------------
561 // DeoptimizationBlob
562
563 class DeoptimizationBlob: public SingletonBlob {
564 friend class VMStructs;
565 friend class JVMCIVMStructs;
566 private:
567 int _unpack_offset;
568 int _unpack_with_exception;
569 int _unpack_with_reexecution;
570
571 int _unpack_with_exception_in_tls;
572
573 #if INCLUDE_JVMCI
574 // Offsets when JVMCI calls uncommon_trap.
575 int _uncommon_trap_offset;
576 int _implicit_exception_uncommon_trap_offset;
577 #endif
578
579 // Creation support
580 DeoptimizationBlob(
581 CodeBuffer* cb,
582 int size,
583 OopMapSet* oop_maps,
584 int unpack_offset,
585 int unpack_with_exception_offset,
586 int unpack_with_reexecution_offset,
587 int frame_size
588 );
589
590 public:
591 // Creation
592 static DeoptimizationBlob* create(
593 CodeBuffer* cb,
594 OopMapSet* oop_maps,
595 int unpack_offset,
596 int unpack_with_exception_offset,
597 int unpack_with_reexecution_offset,
598 int frame_size
599 );
600
601 // Typing
602 bool is_deoptimization_stub() const { return true; }
603 bool exception_address_is_unpack_entry(address pc) const {
604 address unpack_pc = unpack();
605 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
606 }
607
608 // GC for args
609 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
610
611 // Printing
612 void print_value_on(outputStream* st) const;
613
614 address unpack() const { return code_begin() + _unpack_offset; }
615 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
616 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
617
618 // Alternate entry point for C1 where the exception and issuing pc
619 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
620 // instead of being in registers. This is needed because C1 doesn't
621 // model exception paths in a way that keeps these registers free so
622 // there may be live values in those registers during deopt.
623 void set_unpack_with_exception_in_tls_offset(int offset) {
624 _unpack_with_exception_in_tls = offset;
625 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
626 }
627 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
628
629 #if INCLUDE_JVMCI
630 // Offsets when JVMCI calls uncommon_trap.
631 void set_uncommon_trap_offset(int offset) {
632 _uncommon_trap_offset = offset;
633 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
634 }
635 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
636
637 void set_implicit_exception_uncommon_trap_offset(int offset) {
638 _implicit_exception_uncommon_trap_offset = offset;
639 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
640 }
641 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
642 #endif // INCLUDE_JVMCI
643 };
644
645
646 //----------------------------------------------------------------------------------------------------
647 // UncommonTrapBlob (currently only used by Compiler 2)
648
649 #ifdef COMPILER2
650
651 class UncommonTrapBlob: public SingletonBlob {
652 friend class VMStructs;
653 private:
654 // Creation support
655 UncommonTrapBlob(
656 CodeBuffer* cb,
657 int size,
658 OopMapSet* oop_maps,
659 int frame_size
660 );
661
662 public:
663 // Creation
664 static UncommonTrapBlob* 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_uncommon_trap_stub() const { return true; }
675 };
676
677
678 //----------------------------------------------------------------------------------------------------
679 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
680
681 class ExceptionBlob: public SingletonBlob {
682 friend class VMStructs;
683 private:
684 // Creation support
685 ExceptionBlob(
686 CodeBuffer* cb,
687 int size,
688 OopMapSet* oop_maps,
689 int frame_size
690 );
691
692 public:
693 // Creation
694 static ExceptionBlob* create(
695 CodeBuffer* cb,
696 OopMapSet* oop_maps,
697 int frame_size
698 );
699
700 // GC for args
701 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
702
703 // Typing
704 bool is_exception_stub() const { return true; }
705 };
706 #endif // COMPILER2
707
708
709 //----------------------------------------------------------------------------------------------------
710 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
711
712 class SafepointBlob: public SingletonBlob {
713 friend class VMStructs;
714 private:
715 // Creation support
716 SafepointBlob(
717 CodeBuffer* cb,
718 int size,
719 OopMapSet* oop_maps,
720 int frame_size
721 );
722
723 public:
724 // Creation
725 static SafepointBlob* create(
726 CodeBuffer* cb,
727 OopMapSet* oop_maps,
728 int frame_size
729 );
730
731 // GC for args
732 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
733
734 // Typing
735 bool is_safepoint_stub() const { return true; }
736 };
737
738 #endif // SHARE_CODE_CODEBLOB_HPP