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 { 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 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 void print() const { print_on(tty); }
382 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
383 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
384
385 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
386 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
387 };
388
389 class WhiteBox;
390 //----------------------------------------------------------------------------------------------------
391 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
392
393 class BufferBlob: public RuntimeBlob {
394 friend class VMStructs;
395 friend class AdapterBlob;
396 friend class VtableBlob;
397 friend class MethodHandlesAdapterBlob;
398 friend class WhiteBox;
399
400 private:
401 // Creation support
402 BufferBlob(const char* name, int size);
403 BufferBlob(const char* name, int size, CodeBuffer* cb);
404
405 // This ordinary operator delete is needed even though not used, so the
406 // below two-argument operator delete will be treated as a placement
407 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
408 void operator delete(void* p);
409 void* operator new(size_t s, unsigned size) throw();
410
411 public:
412 // Creation
413 static BufferBlob* create(const char* name, int buffer_size);
414 static BufferBlob* create(const char* name, CodeBuffer* cb);
415
416 static void free(BufferBlob* buf);
417
418 // Typing
419 virtual bool is_buffer_blob() const { return true; }
420
421 // GC/Verification support
422 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
423 bool is_alive() const { return true; }
424
425 void verify();
426 void print_on(outputStream* st) const;
427 void print_value_on(outputStream* st) const;
428 };
429
430
431 //----------------------------------------------------------------------------------------------------
432 // AdapterBlob: used to hold C2I/I2C adapters
433
434 class AdapterBlob: public BufferBlob {
435 private:
436 AdapterBlob(int size, CodeBuffer* cb);
437
438 public:
439 // Creation
440 static AdapterBlob* create(CodeBuffer* cb);
441
442 // Typing
443 virtual bool is_adapter_blob() const { return true; }
444 };
445
446 //---------------------------------------------------------------------------------------------------
447 class VtableBlob: public BufferBlob {
448 private:
449 VtableBlob(const char*, int);
450
451 public:
452 // Creation
453 static VtableBlob* create(const char* name, int buffer_size);
454
455 // Typing
456 virtual bool is_vtable_blob() const { return true; }
457 };
458
459 //----------------------------------------------------------------------------------------------------
460 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
461
462 class MethodHandlesAdapterBlob: public BufferBlob {
463 private:
464 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
465
466 public:
467 // Creation
468 static MethodHandlesAdapterBlob* create(int buffer_size);
469
470 // Typing
471 virtual bool is_method_handles_adapter_blob() const { return true; }
472 };
473
474
475 //----------------------------------------------------------------------------------------------------
476 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
477
478 class RuntimeStub: public RuntimeBlob {
479 friend class VMStructs;
480 private:
481 // Creation support
482 RuntimeStub(
483 const char* name,
484 CodeBuffer* cb,
485 int size,
486 int frame_complete,
487 int frame_size,
488 OopMapSet* oop_maps,
489 bool caller_must_gc_arguments
490 );
491
492 // This ordinary operator delete is needed even though not used, so the
493 // below two-argument operator delete will be treated as a placement
494 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
495 void operator delete(void* p);
496 void* operator new(size_t s, unsigned size) throw();
497
498 public:
499 // Creation
500 static RuntimeStub* new_runtime_stub(
501 const char* stub_name,
502 CodeBuffer* cb,
503 int frame_complete,
504 int frame_size,
505 OopMapSet* oop_maps,
506 bool caller_must_gc_arguments
507 );
508
509 // Typing
510 bool is_runtime_stub() const { return true; }
511
512 address entry_point() const { return code_begin(); }
513
514 // GC/Verification support
515 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
516 bool is_alive() const { return true; }
517
518 void verify();
519 void print_on(outputStream* st) const;
520 void print_value_on(outputStream* st) const;
521 };
522
523
524 //----------------------------------------------------------------------------------------------------
525 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
526
527 class SingletonBlob: public RuntimeBlob {
528 friend class VMStructs;
529
530 protected:
531 // This ordinary operator delete is needed even though not used, so the
532 // below two-argument operator delete will be treated as a placement
533 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
534 void operator delete(void* p);
535 void* operator new(size_t s, unsigned size) throw();
536
537 public:
538 SingletonBlob(
539 const char* name,
540 CodeBuffer* cb,
541 int header_size,
542 int size,
543 int frame_size,
544 OopMapSet* oop_maps
545 )
546 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
547 {};
548
549 address entry_point() { return code_begin(); }
550
551 bool is_alive() const { return true; }
552
553 // GC/Verification support
554 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
555 void verify(); // does nothing
556 void print_on(outputStream* st) const;
557 void print_value_on(outputStream* st) const;
558 };
559
560
561 //----------------------------------------------------------------------------------------------------
562 // DeoptimizationBlob
563
564 class DeoptimizationBlob: public SingletonBlob {
565 friend class VMStructs;
566 friend class JVMCIVMStructs;
567 private:
568 int _unpack_offset;
569 int _unpack_with_exception;
570 int _unpack_with_reexecution;
571
572 int _unpack_with_exception_in_tls;
573
574 #if INCLUDE_JVMCI
575 // Offsets when JVMCI calls uncommon_trap.
576 int _uncommon_trap_offset;
577 int _implicit_exception_uncommon_trap_offset;
578 #endif
579
580 // Creation support
581 DeoptimizationBlob(
582 CodeBuffer* cb,
583 int size,
584 OopMapSet* oop_maps,
585 int unpack_offset,
586 int unpack_with_exception_offset,
587 int unpack_with_reexecution_offset,
588 int frame_size
589 );
590
591 public:
592 // Creation
593 static DeoptimizationBlob* create(
594 CodeBuffer* cb,
595 OopMapSet* oop_maps,
596 int unpack_offset,
597 int unpack_with_exception_offset,
598 int unpack_with_reexecution_offset,
599 int frame_size
600 );
601
602 // Typing
603 bool is_deoptimization_stub() const { return true; }
604 bool exception_address_is_unpack_entry(address pc) const {
605 address unpack_pc = unpack();
606 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
607 }
608
609 // GC for args
610 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
611
612 // Printing
613 void print_value_on(outputStream* st) const;
614
615 address unpack() const { return code_begin() + _unpack_offset; }
616 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
617 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
618
619 // Alternate entry point for C1 where the exception and issuing pc
620 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
621 // instead of being in registers. This is needed because C1 doesn't
622 // model exception paths in a way that keeps these registers free so
623 // there may be live values in those registers during deopt.
624 void set_unpack_with_exception_in_tls_offset(int offset) {
625 _unpack_with_exception_in_tls = offset;
626 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
627 }
628 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
629
630 #if INCLUDE_JVMCI
631 // Offsets when JVMCI calls uncommon_trap.
632 void set_uncommon_trap_offset(int offset) {
633 _uncommon_trap_offset = offset;
634 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
635 }
636 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
637
638 void set_implicit_exception_uncommon_trap_offset(int offset) {
639 _implicit_exception_uncommon_trap_offset = offset;
640 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
641 }
642 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
643 #endif // INCLUDE_JVMCI
644 };
645
646
647 //----------------------------------------------------------------------------------------------------
648 // UncommonTrapBlob (currently only used by Compiler 2)
649
650 #ifdef COMPILER2
651
652 class UncommonTrapBlob: public SingletonBlob {
653 friend class VMStructs;
654 private:
655 // Creation support
656 UncommonTrapBlob(
657 CodeBuffer* cb,
658 int size,
659 OopMapSet* oop_maps,
660 int frame_size
661 );
662
663 public:
664 // Creation
665 static UncommonTrapBlob* create(
666 CodeBuffer* cb,
667 OopMapSet* oop_maps,
668 int frame_size
669 );
670
671 // GC for args
672 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
673
674 // Typing
675 bool is_uncommon_trap_stub() const { return true; }
676 };
677
678
679 //----------------------------------------------------------------------------------------------------
680 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
681
682 class ExceptionBlob: public SingletonBlob {
683 friend class VMStructs;
684 private:
685 // Creation support
686 ExceptionBlob(
687 CodeBuffer* cb,
688 int size,
689 OopMapSet* oop_maps,
690 int frame_size
691 );
692
693 public:
694 // Creation
695 static ExceptionBlob* 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_exception_stub() const { return true; }
706 };
707 #endif // COMPILER2
708
709
710 //----------------------------------------------------------------------------------------------------
711 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
712
713 class SafepointBlob: public SingletonBlob {
714 friend class VMStructs;
715 private:
716 // Creation support
717 SafepointBlob(
718 CodeBuffer* cb,
719 int size,
720 OopMapSet* oop_maps,
721 int frame_size
722 );
723
724 public:
725 // Creation
726 static SafepointBlob* create(
727 CodeBuffer* cb,
728 OopMapSet* oop_maps,
729 int frame_size
730 );
731
732 // GC for args
733 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
734
735 // Typing
736 bool is_safepoint_stub() const { return true; }
737 };
738
739 #endif // SHARE_CODE_CODEBLOB_HPP