1 /*
2 * Copyright (c) 1998, 2025, 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/javaFrameAnchor.hpp"
32 #include "runtime/frame.hpp"
33 #include "runtime/handles.hpp"
34 #include "utilities/align.hpp"
35 #include "utilities/macros.hpp"
36
37 class ImmutableOopMap;
38 class ImmutableOopMapSet;
39 class JNIHandleBlock;
40 class OopMapSet;
41
42 // CodeBlob Types
43 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
44 enum class CodeBlobType {
45 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
46 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
47 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
48 All = 3, // All types (No code cache segmentation)
49 NumTypes = 4 // Number of CodeBlobTypes
50 };
51
52 // CodeBlob - superclass for all entries in the CodeCache.
53 //
54 // Subtypes are:
55 // nmethod : JIT Compiled Java methods
56 // RuntimeBlob : Non-compiled method code; generated glue code
57 // BufferBlob : Used for non-relocatable code such as interpreter, stubroutines, etc.
58 // AdapterBlob : Used to hold C2I/I2C adapters
59 // VtableBlob : Used for holding vtable chunks
60 // MethodHandlesAdapterBlob : Used to hold MethodHandles adapters
61 // BufferedInlineTypeBlob : used for pack/unpack handlers
62 // RuntimeStub : Call to VM runtime methods
63 // SingletonBlob : Super-class for all blobs that exist in only one instance
64 // DeoptimizationBlob : Used for deoptimization
65 // SafepointBlob : Used to handle illegal instruction exceptions
66 // ExceptionBlob : Used for stack unrolling
67 // UncommonTrapBlob : Used to handle uncommon traps
68 // UpcallStub : Used for upcalls from native code
69 //
70 //
71 // Layout in the CodeCache:
72 // - header
73 // - content space
74 // - instruction space
75 // Outside of the CodeCache:
76 // - mutable_data
77 // - relocation info
78 // - additional data for subclasses
79
80 enum class CodeBlobKind : u1 {
81 None,
82 Nmethod,
83 Buffer,
84 Adapter,
85 Vtable,
86 MHAdapter,
87 BufferedInlineType,
88 RuntimeStub,
89 Deoptimization,
90 Safepoint,
91 #ifdef COMPILER2
92 Exception,
93 UncommonTrap,
94 #endif
95 Upcall,
96 Number_Of_Kinds
97 };
98
99 class UpcallStub; // for as_upcall_stub()
100 class RuntimeStub; // for as_runtime_stub()
101 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
102 class AdapterBlob;
103 class ExceptionBlob;
104 class DeoptimizationBlob;
105 class SafepointBlob;
106 class UncommonTrapBlob;
107
108 class CodeBlob {
109 friend class VMStructs;
110 friend class JVMCIVMStructs;
111
112 private:
113 void restore_mutable_data(address reloc_data);
114
115 protected:
116 // order fields from large to small to minimize padding between fields
117 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
118 const char* _name;
119 address _mutable_data;
120
121 int _size; // total size of CodeBlob in bytes
122 int _relocation_size; // size of relocation (could be bigger than 64Kb)
123 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
124 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
125 int _data_offset; // offset to where data region begins
126 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
127 int _mutable_data_size;
128
129 S390_ONLY(int _ctable_offset;)
130
131 uint16_t _header_size; // size of header (depends on subclass)
132 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
133 // not finished setting up their frame. Beware of pc's in
134 // that range. There is a similar range(s) on returns
135 // which we don't detect.
136
137 CodeBlobKind _kind; // Kind of this code blob
138
139 bool _caller_must_gc_arguments;
140
141 #ifndef PRODUCT
142 AsmRemarks _asm_remarks;
143 DbgStrings _dbg_strings;
144 #endif
145
146 void print_on_impl(outputStream* st) const;
147 void print_value_on_impl(outputStream* st) const;
148
149 class Vptr {
150 public:
151 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
152 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
153 virtual void prepare_for_archiving(CodeBlob* instance) const {
154 instance->prepare_for_archiving_impl();
155 };
156 virtual void post_restore(CodeBlob* instance) const {
157 instance->post_restore_impl();
158 };
159 };
160
161 static const Vptr* vptr(CodeBlobKind kind);
162 const Vptr* vptr() const;
163
164 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
165 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
166 int mutable_data_size);
167
168 // Simple CodeBlob used for simple BufferBlob.
169 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
170
171
172 void operator delete(void* p) { }
173
174 void prepare_for_archiving_impl();
175 void post_restore_impl();
176
177 public:
178
179 ~CodeBlob() {
180 assert(_oop_maps == nullptr, "Not flushed");
181 }
182
183 // Returns the space needed for CodeBlob
184 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
185 static unsigned int align_code_offset(int offset);
186
187 // Deletion
188 void purge();
189
190 // Typing
191 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
192 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
193 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
194 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
195 #ifdef COMPILER2
196 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
197 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
198 #else
199 bool is_uncommon_trap_stub() const { return false; }
200 bool is_exception_stub() const { return false; }
201 #endif
202 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
203 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
204 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
205 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
206 bool is_buffered_inline_type_blob() const { return _kind == CodeBlobKind::BufferedInlineType; }
207 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
208
209 // Casting
210 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
211 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
212 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
213 AdapterBlob* as_adapter_blob() const { assert(is_adapter_blob(), "must be adapter blob"); return (AdapterBlob*) this; }
214 ExceptionBlob* as_exception_blob() const { assert(is_exception_stub(), "must be exception stub"); return (ExceptionBlob*) this; }
215 DeoptimizationBlob* as_deoptimization_blob() const { assert(is_deoptimization_stub(), "must be deopt stub"); return (DeoptimizationBlob*) this; }
216 SafepointBlob* as_safepoint_blob() const { assert(is_safepoint_stub(), "must be safepoint stub"); return (SafepointBlob*) this; }
217 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
218 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
219 UncommonTrapBlob* as_uncommon_trap_blob() const { assert(is_uncommon_trap_stub(), "must be uncommon trap stub"); return (UncommonTrapBlob*) this; }
220
221 // Boundaries
222 address header_begin() const { return (address) this; }
223 address header_end() const { return ((address) this) + _header_size; }
224 address content_begin() const { return (address) header_begin() + _content_offset; }
225 address content_end() const { return (address) header_begin() + _data_offset; }
226 address code_begin() const { return (address) header_begin() + _code_offset; }
227 address code_end() const { return (address) header_begin() + _data_offset; }
228 address data_begin() const { return (address) header_begin() + _data_offset; }
229 address data_end() const { return (address) header_begin() + _size; }
230 address blob_end() const { return (address) header_begin() + _size; }
231 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
232
233 int mutable_data_size() const { return _mutable_data_size; }
234 address mutable_data_begin() const { return _mutable_data; }
235 address mutable_data_end() const { return _mutable_data + _mutable_data_size; }
236
237 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; }
238 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); }
239
240 // Offsets
241 int content_offset() const { return _content_offset; }
242 int code_offset() const { return _code_offset; }
243
244 // This field holds the beginning of the const section in the old code buffer.
245 // It is needed to fix relocations of pc-relative loads when resizing the
246 // the constant pool or moving it.
247 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
248 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
249
250 // Sizes
251 int size() const { return _size; }
252 int header_size() const { return _header_size; }
253 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
254 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
255 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
256
257 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
258 void adjust_size(size_t used) {
259 _size = (int)used;
260 _data_offset = _size;
261 }
262
263 // Containment
264 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); }
265 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
266 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
267 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
268 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
269 int frame_complete_offset() const { return _frame_complete_offset; }
270
271 // OopMap for frame
272 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
273 void set_oop_maps(OopMapSet* p);
274 void set_oop_maps(ImmutableOopMapSet* p) { _oop_maps = p; }
275
276 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
277 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
278
279 // Frame support. Sizes are in word units.
280 int frame_size() const { return _frame_size; }
281 void set_frame_size(int size) { _frame_size = size; }
282
283 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
284 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
285
286 // Naming
287 const char* name() const { return _name; }
288 void set_name(const char* name) { _name = name; }
289
290 // Debugging
291 void verify();
292 void print() const;
293 void print_on(outputStream* st) const;
294 void print_value_on(outputStream* st) const;
295
296 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
297 void print_code_on(outputStream* st);
298
299 // Print to stream, any comments associated with offset.
300 void print_block_comment(outputStream* stream, address block_begin) const;
301
302 #ifndef PRODUCT
303 AsmRemarks &asm_remarks() { return _asm_remarks; }
304 DbgStrings &dbg_strings() { return _dbg_strings; }
305
306 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
307 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
308 #endif
309
310 void copy_to(address buffer) {
311 memcpy(buffer, this, this->size());
312 }
313
314 // methods to archive a blob into AOT code cache
315 void prepare_for_archiving();
316 static void archive_blob(CodeBlob* blob, address archive_buffer);
317
318 // methods to restore a blob from AOT code cache into the CodeCache
319 void post_restore();
320 CodeBlob* restore(address code_cache_buffer, const char* name, address archived_reloc_data, ImmutableOopMapSet* archived_oop_maps);
321 static CodeBlob* create(CodeBlob* archived_blob,
322 const char* name,
323 address archived_reloc_data,
324 ImmutableOopMapSet* archived_oop_maps
325 #ifndef PRODUCT
326 , AsmRemarks& archived_asm_remarks
327 , DbgStrings& archived_dbg_strings
328 #endif // PRODUCT
329 );
330 };
331
332 //----------------------------------------------------------------------------------------------------
333 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
334
335 class RuntimeBlob : public CodeBlob {
336 friend class VMStructs;
337 public:
338
339 // Creation
340 // a) simple CodeBlob
341 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
342 : CodeBlob(name, kind, size, header_size)
343 {}
344
345 // b) full CodeBlob
346 // frame_complete is the offset from the beginning of the instructions
347 // to where the frame setup (from stackwalk viewpoint) is complete.
348 RuntimeBlob(
349 const char* name,
350 CodeBlobKind kind,
351 CodeBuffer* cb,
352 int size,
353 uint16_t header_size,
354 int16_t frame_complete,
355 int frame_size,
356 OopMapSet* oop_maps,
357 bool caller_must_gc_arguments = false
358 );
359
360 static void free(RuntimeBlob* blob);
361
362 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
363 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
364
365 class Vptr : public CodeBlob::Vptr {
366 };
367 };
368
369 class WhiteBox;
370 //----------------------------------------------------------------------------------------------------
371 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
372
373 class BufferBlob: public RuntimeBlob {
374 friend class VMStructs;
375 friend class AdapterBlob;
376 friend class VtableBlob;
377 friend class MethodHandlesAdapterBlob;
378 friend class BufferedInlineTypeBlob;
379 friend class UpcallStub;
380 friend class WhiteBox;
381
382 private:
383 // Creation support
384 BufferBlob(const char* name, CodeBlobKind kind, int size);
385 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int header_size);
386 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
387
388 void* operator new(size_t s, unsigned size) throw();
389
390 public:
391 // Creation
392 static BufferBlob* create(const char* name, uint buffer_size);
393 static BufferBlob* create(const char* name, CodeBuffer* cb);
394
395 static void free(BufferBlob* buf);
396
397 void print_on_impl(outputStream* st) const;
398 void print_value_on_impl(outputStream* st) const;
399
400 class Vptr : public RuntimeBlob::Vptr {
401 void print_on(const CodeBlob* instance, outputStream* st) const override {
402 ((const BufferBlob*)instance)->print_on_impl(st);
403 }
404 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
405 ((const BufferBlob*)instance)->print_value_on_impl(st);
406 }
407 };
408
409 static const Vptr _vpntr;
410 };
411
412
413 //----------------------------------------------------------------------------------------------------
414 // AdapterBlob: used to hold C2I/I2C adapters
415
416 class AdapterBlob: public BufferBlob {
417 private:
418 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
419
420 public:
421 // Creation
422 static AdapterBlob* create(CodeBuffer* cb,
423 int frame_complete,
424 int frame_size,
425 OopMapSet* oop_maps,
426 bool caller_must_gc_arguments = false);
427
428 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
429 };
430
431 //---------------------------------------------------------------------------------------------------
432 class VtableBlob: public BufferBlob {
433 private:
434 VtableBlob(const char*, int);
435
436 void* operator new(size_t s, unsigned size) throw();
437
438 public:
439 // Creation
440 static VtableBlob* create(const char* name, int buffer_size);
441 };
442
443 //----------------------------------------------------------------------------------------------------
444 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
445
446 class MethodHandlesAdapterBlob: public BufferBlob {
447 private:
448 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
449
450 public:
451 // Creation
452 static MethodHandlesAdapterBlob* create(int buffer_size);
453 };
454
455 //----------------------------------------------------------------------------------------------------
456 // BufferedInlineTypeBlob : used for pack/unpack handlers
457
458 class BufferedInlineTypeBlob: public BufferBlob {
459 private:
460 const int _pack_fields_off;
461 const int _pack_fields_jobject_off;
462 const int _unpack_fields_off;
463
464 BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
465
466 public:
467 // Creation
468 static BufferedInlineTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
469
470 address pack_fields() const { return code_begin() + _pack_fields_off; }
471 address pack_fields_jobject() const { return code_begin() + _pack_fields_jobject_off; }
472 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
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 int16_t frame_complete,
487 int frame_size,
488 OopMapSet* oop_maps,
489 bool caller_must_gc_arguments
490 );
491
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 int16_t frame_complete,
500 int frame_size,
501 OopMapSet* oop_maps,
502 bool caller_must_gc_arguments,
503 bool alloc_fail_is_fatal=true
504 );
505
506 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
507
508 address entry_point() const { return code_begin(); }
509
510 void print_on_impl(outputStream* st) const;
511 void print_value_on_impl(outputStream* st) const;
512
513 class Vptr : public RuntimeBlob::Vptr {
514 void print_on(const CodeBlob* instance, outputStream* st) const override {
515 instance->as_runtime_stub()->print_on_impl(st);
516 }
517 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
518 instance->as_runtime_stub()->print_value_on_impl(st);
519 }
520 };
521
522 static const Vptr _vpntr;
523 };
524
525
526 //----------------------------------------------------------------------------------------------------
527 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
528
529 class SingletonBlob: public RuntimeBlob {
530 friend class VMStructs;
531
532 protected:
533 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
534
535 public:
536 SingletonBlob(
537 const char* name,
538 CodeBlobKind kind,
539 CodeBuffer* cb,
540 int size,
541 uint16_t header_size,
542 int frame_size,
543 OopMapSet* oop_maps
544 )
545 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
546 {};
547
548 address entry_point() { return code_begin(); }
549
550 void print_on_impl(outputStream* st) const;
551 void print_value_on_impl(outputStream* st) const;
552
553 class Vptr : public RuntimeBlob::Vptr {
554 void print_on(const CodeBlob* instance, outputStream* st) const override {
555 ((const SingletonBlob*)instance)->print_on_impl(st);
556 }
557 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
558 ((const SingletonBlob*)instance)->print_value_on_impl(st);
559 }
560 };
561
562 static const Vptr _vpntr;
563 };
564
565
566 //----------------------------------------------------------------------------------------------------
567 // DeoptimizationBlob
568
569 class DeoptimizationBlob: public SingletonBlob {
570 friend class VMStructs;
571 friend class JVMCIVMStructs;
572 private:
573 int _unpack_offset;
574 int _unpack_with_exception;
575 int _unpack_with_reexecution;
576
577 int _unpack_with_exception_in_tls;
578
579 #if INCLUDE_JVMCI
580 // Offsets when JVMCI calls uncommon_trap.
581 int _uncommon_trap_offset;
582 int _implicit_exception_uncommon_trap_offset;
583 #endif
584
585 // Creation support
586 DeoptimizationBlob(
587 CodeBuffer* cb,
588 int size,
589 OopMapSet* oop_maps,
590 int unpack_offset,
591 int unpack_with_exception_offset,
592 int unpack_with_reexecution_offset,
593 int frame_size
594 );
595
596 public:
597 // Creation
598 static DeoptimizationBlob* create(
599 CodeBuffer* cb,
600 OopMapSet* oop_maps,
601 int unpack_offset,
602 int unpack_with_exception_offset,
603 int unpack_with_reexecution_offset,
604 int frame_size
605 );
606
607 address unpack() const { return code_begin() + _unpack_offset; }
608 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
609 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
610
611 // Alternate entry point for C1 where the exception and issuing pc
612 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
613 // instead of being in registers. This is needed because C1 doesn't
614 // model exception paths in a way that keeps these registers free so
615 // there may be live values in those registers during deopt.
616 void set_unpack_with_exception_in_tls_offset(int offset) {
617 _unpack_with_exception_in_tls = offset;
618 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
619 }
620 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
621
622 #if INCLUDE_JVMCI
623 // Offsets when JVMCI calls uncommon_trap.
624 void set_uncommon_trap_offset(int offset) {
625 _uncommon_trap_offset = offset;
626 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
627 }
628 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
629
630 void set_implicit_exception_uncommon_trap_offset(int offset) {
631 _implicit_exception_uncommon_trap_offset = offset;
632 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
633 }
634 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
635 #endif // INCLUDE_JVMCI
636
637 void print_value_on_impl(outputStream* st) const;
638
639 class Vptr : public SingletonBlob::Vptr {
640 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
641 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
642 }
643 };
644
645 static const Vptr _vpntr;
646 };
647
648
649 //----------------------------------------------------------------------------------------------------
650 // UncommonTrapBlob (currently only used by Compiler 2)
651
652 #ifdef COMPILER2
653
654 class UncommonTrapBlob: public SingletonBlob {
655 friend class VMStructs;
656 private:
657 // Creation support
658 UncommonTrapBlob(
659 CodeBuffer* cb,
660 int size,
661 OopMapSet* oop_maps,
662 int frame_size
663 );
664
665 public:
666 // Creation
667 static UncommonTrapBlob* create(
668 CodeBuffer* cb,
669 OopMapSet* oop_maps,
670 int frame_size
671 );
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 void post_restore_impl() {
698 trace_new_stub(this, "ExceptionBlob");
699 }
700
701 class Vptr : public SingletonBlob::Vptr {
702 void post_restore(CodeBlob* instance) const override {
703 ((ExceptionBlob*)instance)->post_restore_impl();
704 }
705 };
706
707 static const Vptr _vpntr;
708 };
709 #endif // COMPILER2
710
711
712 //----------------------------------------------------------------------------------------------------
713 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
714
715 class SafepointBlob: public SingletonBlob {
716 friend class VMStructs;
717 private:
718 // Creation support
719 SafepointBlob(
720 CodeBuffer* cb,
721 int size,
722 OopMapSet* oop_maps,
723 int frame_size
724 );
725
726 public:
727 // Creation
728 static SafepointBlob* create(
729 CodeBuffer* cb,
730 OopMapSet* oop_maps,
731 int frame_size
732 );
733 };
734
735 //----------------------------------------------------------------------------------------------------
736
737 class UpcallLinker;
738
739 // A (Panama) upcall stub. Not used by JNI.
740 class UpcallStub: public RuntimeBlob {
741 friend class VMStructs;
742 friend class UpcallLinker;
743 private:
744 jobject _receiver;
745 ByteSize _frame_data_offset;
746
747 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
748
749 void* operator new(size_t s, unsigned size) throw();
750
751 struct FrameData {
752 JavaFrameAnchor jfa;
753 JavaThread* thread;
754 JNIHandleBlock* old_handles;
755 JNIHandleBlock* new_handles;
756 };
757
758 // defined in frame_ARCH.cpp
759 FrameData* frame_data_for_frame(const frame& frame) const;
760 public:
761 // Creation
762 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
763
764 static void free(UpcallStub* blob);
765
766 jobject receiver() { return _receiver; }
767
768 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
769
770 // GC support
771 void oops_do(OopClosure* f, const frame& frame);
772
773 void print_on_impl(outputStream* st) const;
774 void print_value_on_impl(outputStream* st) const;
775
776 class Vptr : public RuntimeBlob::Vptr {
777 void print_on(const CodeBlob* instance, outputStream* st) const override {
778 instance->as_upcall_stub()->print_on_impl(st);
779 }
780 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
781 instance->as_upcall_stub()->print_value_on_impl(st);
782 }
783 };
784
785 static const Vptr _vpntr;
786 };
787
788 #endif // SHARE_CODE_CODEBLOB_HPP