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 virtual bool is_buffered_value_type_blob() const { return false; }
146
147 inline bool is_compiled_by_c1() const { return _type == compiler_c1; };
148 inline bool is_compiled_by_c2() const { return _type == compiler_c2; };
149 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; };
150 const char* compiler_name() const;
151
152 // Casting
153 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; }
154 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
155 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; }
156 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; }
157 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
158
159 // Boundaries
160 address header_begin() const { return (address) this; }
161 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; };
162 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; }
163 address content_begin() const { return _content_begin; }
164 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
165 address code_begin() const { return _code_begin; }
166 address code_end() const { return _code_end; }
167 address data_end() const { return _data_end; }
168
169 // This field holds the beginning of the const section in the old code buffer.
170 // It is needed to fix relocations of pc-relative loads when resizing the
171 // the constant pool or moving it.
172 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
173 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
174
175 // Sizes
176 int size() const { return _size; }
177 int header_size() const { return _header_size; }
178 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); }
179 int content_size() const { return content_end() - content_begin(); }
180 int code_size() const { return code_end() - code_begin(); }
181 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
182 void adjust_size(size_t used) {
183 _size = (int)used;
184 _data_offset = (int)used;
185 _code_end = (address)this + used;
186 _data_end = (address)this + used;
187 }
188
189 // Containment
190 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
191 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
192 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
193 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
194 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
195 int frame_complete_offset() const { return _frame_complete_offset; }
196
197 // CodeCache support: really only used by the nmethods, but in order to get
198 // asserts and certain bookkeeping to work in the CodeCache they are defined
199 // virtual here.
200 virtual bool is_zombie() const { return false; }
201 virtual bool is_locked_by_vm() const { return false; }
202
203 virtual bool is_unloaded() const { return false; }
204 virtual bool is_not_entrant() const { return false; }
205
206 // GC support
207 virtual bool is_alive() const = 0;
208
209 // OopMap for frame
210 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
211 void set_oop_maps(OopMapSet* p);
212 const ImmutableOopMap* oop_map_for_return_address(address return_address);
213 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
214
215 // Frame support. Sizes are in word units.
216 int frame_size() const { return _frame_size; }
217 void set_frame_size(int size) { _frame_size = size; }
218
219 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
220 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
221
222 // Naming
223 const char* name() const { return _name; }
224 void set_name(const char* name) { _name = name; }
225
226 // Debugging
227 virtual void verify() = 0;
228 virtual void print() const;
229 virtual void print_on(outputStream* st) const;
230 virtual void print_value_on(outputStream* st) const;
231 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
232 void print_code();
233
234 bool has_block_comment(address block_begin) const {
235 intptr_t offset = (intptr_t)(block_begin - code_begin());
236 return _strings.has_block_comment(offset);
237 }
238 // Print the comment associated with offset on stream, if there is one
239 virtual void print_block_comment(outputStream* stream, address block_begin) const {
240 intptr_t offset = (intptr_t)(block_begin - code_begin());
241 _strings.print_block_comment(stream, offset);
242 }
243
244 // Transfer ownership of comments to this CodeBlob
245 void set_strings(CodeStrings& strings) {
246 assert(!is_aot(), "invalid on aot");
247 _strings.assign(strings);
248 }
249
250 static ByteSize name_field_offset() {
251 return byte_offset_of(CodeBlob, _name);
252 }
253
254 static ByteSize oop_maps_field_offset() {
255 return byte_offset_of(CodeBlob, _oop_maps);
256 }
257 };
258
259 class CodeBlobLayout : public StackObj {
260 private:
261 int _size;
262 int _header_size;
263 int _relocation_size;
264 int _content_offset;
265 int _code_offset;
266 int _data_offset;
267 address _code_begin;
268 address _code_end;
269 address _content_begin;
270 address _content_end;
271 address _data_end;
272 address _relocation_begin;
273 address _relocation_end;
274
275 public:
276 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
277 _size(0),
278 _header_size(0),
279 _relocation_size(0),
280 _content_offset(0),
281 _code_offset(0),
282 _data_offset(0),
283 _code_begin(code_begin),
284 _code_end(code_end),
285 _content_begin(content_begin),
286 _content_end(content_end),
287 _data_end(data_end),
288 _relocation_begin(relocation_begin),
289 _relocation_end(relocation_end)
290 {
291 }
292
293 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
294 _size(size),
295 _header_size(header_size),
296 _relocation_size(relocation_size),
297 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
298 _code_offset(_content_offset),
299 _data_offset(data_offset)
300 {
301 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
302
303 _code_begin = (address) start + _code_offset;
304 _code_end = (address) start + _data_offset;
305
306 _content_begin = (address) start + _content_offset;
307 _content_end = (address) start + _data_offset;
308
309 _data_end = (address) start + _size;
310 _relocation_begin = (address) start + _header_size;
311 _relocation_end = _relocation_begin + _relocation_size;
312 }
313
314 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
315 _size(size),
316 _header_size(header_size),
317 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
318 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
319 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
320 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize))
321 {
322 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
323
324 _code_begin = (address) start + _code_offset;
325 _code_end = (address) start + _data_offset;
326
327 _content_begin = (address) start + _content_offset;
328 _content_end = (address) start + _data_offset;
329
330 _data_end = (address) start + _size;
331 _relocation_begin = (address) start + _header_size;
332 _relocation_end = _relocation_begin + _relocation_size;
333 }
334
335 int size() const { return _size; }
336 int header_size() const { return _header_size; }
337 int relocation_size() const { return _relocation_size; }
338 int content_offset() const { return _content_offset; }
339 int code_offset() const { return _code_offset; }
340 int data_offset() const { return _data_offset; }
341 address code_begin() const { return _code_begin; }
342 address code_end() const { return _code_end; }
343 address data_end() const { return _data_end; }
344 address relocation_begin() const { return _relocation_begin; }
345 address relocation_end() const { return _relocation_end; }
346 address content_begin() const { return _content_begin; }
347 address content_end() const { return _content_end; }
348 };
349
350
351 class RuntimeBlob : public CodeBlob {
352 friend class VMStructs;
353 public:
354
355 // Creation
356 // a) simple CodeBlob
357 // frame_complete is the offset from the beginning of the instructions
358 // to where the frame setup (from stackwalk viewpoint) is complete.
359 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
360
361 // b) full CodeBlob
362 RuntimeBlob(
363 const char* name,
364 CodeBuffer* cb,
365 int header_size,
366 int size,
367 int frame_complete,
368 int frame_size,
369 OopMapSet* oop_maps,
370 bool caller_must_gc_arguments = false
371 );
372
373 // GC support
374 virtual bool is_alive() const = 0;
375
376 void verify();
377
378 // OopMap for frame
379 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
380
381 // Debugging
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 BufferedValueTypeBlob;
399 friend class WhiteBox;
400
401 private:
402 // Creation support
403 BufferBlob(const char* name, int size);
404 BufferBlob(const char* name, int size, CodeBuffer* cb);
405 BufferBlob(const char* name, int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
406
407 // This ordinary operator delete is needed even though not used, so the
408 // below two-argument operator delete will be treated as a placement
409 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
410 void operator delete(void* p);
411 void* operator new(size_t s, unsigned size) throw();
412
413 public:
414 // Creation
415 static BufferBlob* create(const char* name, int buffer_size);
416 static BufferBlob* create(const char* name, CodeBuffer* cb);
417
418 static void free(BufferBlob* buf);
419
420 // Typing
421 virtual bool is_buffer_blob() const { return true; }
422
423 // GC/Verification support
424 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
425 bool is_alive() const { return true; }
426
427 void verify();
428 void print_on(outputStream* st) const;
429 void print_value_on(outputStream* st) const;
430 };
431
432
433 //----------------------------------------------------------------------------------------------------
434 // AdapterBlob: used to hold C2I/I2C adapters
435
436 class AdapterBlob: public BufferBlob {
437 private:
438 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
439
440 public:
441 // Creation
442 static AdapterBlob* create(CodeBuffer* cb,
443 int frame_complete,
444 int frame_size,
445 OopMapSet* oop_maps,
446 bool caller_must_gc_arguments = false);
447
448 // Typing
449 virtual bool is_adapter_blob() const { return true; }
450
451 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
452 };
453
454 //---------------------------------------------------------------------------------------------------
455 class VtableBlob: public BufferBlob {
456 private:
457 VtableBlob(const char*, int);
458
459 public:
460 // Creation
461 static VtableBlob* create(const char* name, int buffer_size);
462
463 // Typing
464 virtual bool is_vtable_blob() const { return true; }
465 };
466
467 //----------------------------------------------------------------------------------------------------
468 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
469
470 class MethodHandlesAdapterBlob: public BufferBlob {
471 private:
472 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
473
474 public:
475 // Creation
476 static MethodHandlesAdapterBlob* create(int buffer_size);
477
478 // Typing
479 virtual bool is_method_handles_adapter_blob() const { return true; }
480 };
481
482 //----------------------------------------------------------------------------------------------------
483 // BufferedValueTypeBlob : used for pack/unpack handlers
484
485 class BufferedValueTypeBlob: public BufferBlob {
486 private:
487 const int _pack_fields_off;
488 const int _unpack_fields_off;
489
490 BufferedValueTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int unpack_fields_off);
491
492 public:
493 // Creation
494 static BufferedValueTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int unpack_fields_off);
495
496 address pack_fields() const { return code_begin() + _pack_fields_off; }
497 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
498
499 // Typing
500 virtual bool is_buffered_value_type_blob() const { return true; }
501 };
502
503 //----------------------------------------------------------------------------------------------------
504 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
505
506 class RuntimeStub: public RuntimeBlob {
507 friend class VMStructs;
508 private:
509 // Creation support
510 RuntimeStub(
511 const char* name,
512 CodeBuffer* cb,
513 int size,
514 int frame_complete,
515 int frame_size,
516 OopMapSet* oop_maps,
517 bool caller_must_gc_arguments
518 );
519
520 // This ordinary operator delete is needed even though not used, so the
521 // below two-argument operator delete will be treated as a placement
522 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
523 void operator delete(void* p);
524 void* operator new(size_t s, unsigned size) throw();
525
526 public:
527 // Creation
528 static RuntimeStub* new_runtime_stub(
529 const char* stub_name,
530 CodeBuffer* cb,
531 int frame_complete,
532 int frame_size,
533 OopMapSet* oop_maps,
534 bool caller_must_gc_arguments
535 );
536
537 // Typing
538 bool is_runtime_stub() const { return true; }
539
540 address entry_point() const { return code_begin(); }
541
542 // GC/Verification support
543 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
544 bool is_alive() const { return true; }
545
546 void verify();
547 void print_on(outputStream* st) const;
548 void print_value_on(outputStream* st) const;
549 };
550
551
552 //----------------------------------------------------------------------------------------------------
553 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
554
555 class SingletonBlob: public RuntimeBlob {
556 friend class VMStructs;
557
558 protected:
559 // This ordinary operator delete is needed even though not used, so the
560 // below two-argument operator delete will be treated as a placement
561 // delete rather than an ordinary sized delete; see C++14 3.7.4.2/p2.
562 void operator delete(void* p);
563 void* operator new(size_t s, unsigned size) throw();
564
565 public:
566 SingletonBlob(
567 const char* name,
568 CodeBuffer* cb,
569 int header_size,
570 int size,
571 int frame_size,
572 OopMapSet* oop_maps
573 )
574 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
575 {};
576
577 address entry_point() { return code_begin(); }
578
579 bool is_alive() const { return true; }
580
581 // GC/Verification support
582 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
583 void verify(); // does nothing
584 void print_on(outputStream* st) const;
585 void print_value_on(outputStream* st) const;
586 };
587
588
589 //----------------------------------------------------------------------------------------------------
590 // DeoptimizationBlob
591
592 class DeoptimizationBlob: public SingletonBlob {
593 friend class VMStructs;
594 friend class JVMCIVMStructs;
595 private:
596 int _unpack_offset;
597 int _unpack_with_exception;
598 int _unpack_with_reexecution;
599
600 int _unpack_with_exception_in_tls;
601
602 #if INCLUDE_JVMCI
603 // Offsets when JVMCI calls uncommon_trap.
604 int _uncommon_trap_offset;
605 int _implicit_exception_uncommon_trap_offset;
606 #endif
607
608 // Creation support
609 DeoptimizationBlob(
610 CodeBuffer* cb,
611 int size,
612 OopMapSet* oop_maps,
613 int unpack_offset,
614 int unpack_with_exception_offset,
615 int unpack_with_reexecution_offset,
616 int frame_size
617 );
618
619 public:
620 // Creation
621 static DeoptimizationBlob* create(
622 CodeBuffer* cb,
623 OopMapSet* oop_maps,
624 int unpack_offset,
625 int unpack_with_exception_offset,
626 int unpack_with_reexecution_offset,
627 int frame_size
628 );
629
630 // Typing
631 bool is_deoptimization_stub() const { return true; }
632 bool exception_address_is_unpack_entry(address pc) const {
633 address unpack_pc = unpack();
634 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
635 }
636
637 // GC for args
638 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
639
640 // Printing
641 void print_value_on(outputStream* st) const;
642
643 address unpack() const { return code_begin() + _unpack_offset; }
644 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
645 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
646
647 // Alternate entry point for C1 where the exception and issuing pc
648 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
649 // instead of being in registers. This is needed because C1 doesn't
650 // model exception paths in a way that keeps these registers free so
651 // there may be live values in those registers during deopt.
652 void set_unpack_with_exception_in_tls_offset(int offset) {
653 _unpack_with_exception_in_tls = offset;
654 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
655 }
656 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
657
658 #if INCLUDE_JVMCI
659 // Offsets when JVMCI calls uncommon_trap.
660 void set_uncommon_trap_offset(int offset) {
661 _uncommon_trap_offset = offset;
662 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
663 }
664 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
665
666 void set_implicit_exception_uncommon_trap_offset(int offset) {
667 _implicit_exception_uncommon_trap_offset = offset;
668 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
669 }
670 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
671 #endif // INCLUDE_JVMCI
672 };
673
674
675 //----------------------------------------------------------------------------------------------------
676 // UncommonTrapBlob (currently only used by Compiler 2)
677
678 #ifdef COMPILER2
679
680 class UncommonTrapBlob: public SingletonBlob {
681 friend class VMStructs;
682 private:
683 // Creation support
684 UncommonTrapBlob(
685 CodeBuffer* cb,
686 int size,
687 OopMapSet* oop_maps,
688 int frame_size
689 );
690
691 public:
692 // Creation
693 static UncommonTrapBlob* create(
694 CodeBuffer* cb,
695 OopMapSet* oop_maps,
696 int frame_size
697 );
698
699 // GC for args
700 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
701
702 // Typing
703 bool is_uncommon_trap_stub() const { return true; }
704 };
705
706
707 //----------------------------------------------------------------------------------------------------
708 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
709
710 class ExceptionBlob: public SingletonBlob {
711 friend class VMStructs;
712 private:
713 // Creation support
714 ExceptionBlob(
715 CodeBuffer* cb,
716 int size,
717 OopMapSet* oop_maps,
718 int frame_size
719 );
720
721 public:
722 // Creation
723 static ExceptionBlob* create(
724 CodeBuffer* cb,
725 OopMapSet* oop_maps,
726 int frame_size
727 );
728
729 // GC for args
730 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
731
732 // Typing
733 bool is_exception_stub() const { return true; }
734 };
735 #endif // COMPILER2
736
737
738 //----------------------------------------------------------------------------------------------------
739 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
740
741 class SafepointBlob: public SingletonBlob {
742 friend class VMStructs;
743 private:
744 // Creation support
745 SafepointBlob(
746 CodeBuffer* cb,
747 int size,
748 OopMapSet* oop_maps,
749 int frame_size
750 );
751
752 public:
753 // Creation
754 static SafepointBlob* create(
755 CodeBuffer* cb,
756 OopMapSet* oop_maps,
757 int frame_size
758 );
759
760 // GC for args
761 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
762
763 // Typing
764 bool is_safepoint_stub() const { return true; }
765 };
766
767 #endif // SHARE_CODE_CODEBLOB_HPP