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/frame.hpp"
32 #include "runtime/handles.hpp"
33 #include "runtime/javaFrameAnchor.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 _relocation_size; }
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 };
326
327 //----------------------------------------------------------------------------------------------------
328 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
329
330 class RuntimeBlob : public CodeBlob {
331 friend class VMStructs;
332 public:
333
334 // Creation
335 // a) simple CodeBlob
336 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
337 : CodeBlob(name, kind, size, header_size)
338 {}
339
340 // b) full CodeBlob
341 // frame_complete is the offset from the beginning of the instructions
342 // to where the frame setup (from stackwalk viewpoint) is complete.
343 RuntimeBlob(
344 const char* name,
345 CodeBlobKind kind,
346 CodeBuffer* cb,
347 int size,
348 uint16_t header_size,
349 int16_t frame_complete,
350 int frame_size,
351 OopMapSet* oop_maps,
352 bool caller_must_gc_arguments = false
353 );
354
355 static void free(RuntimeBlob* blob);
356
357 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
358 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
359
360 class Vptr : public CodeBlob::Vptr {
361 };
362 };
363
364 class WhiteBox;
365 //----------------------------------------------------------------------------------------------------
366 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
367
368 class BufferBlob: public RuntimeBlob {
369 friend class VMStructs;
370 friend class AdapterBlob;
371 friend class VtableBlob;
372 friend class MethodHandlesAdapterBlob;
373 friend class BufferedInlineTypeBlob;
374 friend class UpcallStub;
375 friend class WhiteBox;
376
377 private:
378 // Creation support
379 BufferBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size = sizeof(BufferBlob));
380 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size = sizeof(BufferBlob));
381 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
382
383 void* operator new(size_t s, unsigned size) throw();
384
385 public:
386 // Creation
387 static BufferBlob* create(const char* name, uint buffer_size);
388 static BufferBlob* create(const char* name, CodeBuffer* cb);
389
390 static void free(BufferBlob* buf);
391
392 void print_on_impl(outputStream* st) const;
393 void print_value_on_impl(outputStream* st) const;
394
395 class Vptr : public RuntimeBlob::Vptr {
396 void print_on(const CodeBlob* instance, outputStream* st) const override {
397 ((const BufferBlob*)instance)->print_on_impl(st);
398 }
399 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
400 ((const BufferBlob*)instance)->print_value_on_impl(st);
401 }
402 };
403
404 static const Vptr _vpntr;
405 };
406
407
408 //----------------------------------------------------------------------------------------------------
409 // AdapterBlob: used to hold C2I/I2C adapters
410
411 class AdapterBlob: public BufferBlob {
412 public:
413 static const int ENTRY_COUNT = 7;
414 private:
415 AdapterBlob(int size, CodeBuffer* cb, int entry_offset[ENTRY_COUNT], int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
416
417 // _i2c_offset is always 0 so no need to store it
418 int _c2i_offset;
419 int _c2i_inline_offset;
420 int _c2i_inline_ro_offset;
421 int _c2i_unverified_offset;
422 int _c2i_unverified_inline_offset;
423 int _c2i_no_clinit_check_offset;
424 public:
425 // Creation
426 static AdapterBlob* create(CodeBuffer* cb,
427 int entry_offset[ENTRY_COUNT],
428 int frame_complete,
429 int frame_size,
430 OopMapSet* oop_maps,
431 bool caller_must_gc_arguments = false);
432
433 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
434 static AdapterBlob* create(CodeBuffer* cb, int entry_offset[ENTRY_COUNT]);
435 void get_offsets(int entry_offset[ENTRY_COUNT]);
436 };
437
438 //---------------------------------------------------------------------------------------------------
439 class VtableBlob: public BufferBlob {
440 private:
441 VtableBlob(const char*, int);
442
443 void* operator new(size_t s, unsigned size) throw();
444
445 public:
446 // Creation
447 static VtableBlob* create(const char* name, int buffer_size);
448 };
449
450 //----------------------------------------------------------------------------------------------------
451 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
452
453 class MethodHandlesAdapterBlob: public BufferBlob {
454 private:
455 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
456
457 public:
458 // Creation
459 static MethodHandlesAdapterBlob* create(int buffer_size);
460 };
461
462 //----------------------------------------------------------------------------------------------------
463 // BufferedInlineTypeBlob : used for pack/unpack handlers
464
465 class BufferedInlineTypeBlob: public BufferBlob {
466 private:
467 const int _pack_fields_off;
468 const int _pack_fields_jobject_off;
469 const int _unpack_fields_off;
470
471 BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
472
473 public:
474 // Creation
475 static BufferedInlineTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
476
477 address pack_fields() const { return code_begin() + _pack_fields_off; }
478 address pack_fields_jobject() const { return code_begin() + _pack_fields_jobject_off; }
479 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
480 };
481
482 //----------------------------------------------------------------------------------------------------
483 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
484
485 class RuntimeStub: public RuntimeBlob {
486 friend class VMStructs;
487 private:
488 // Creation support
489 RuntimeStub(
490 const char* name,
491 CodeBuffer* cb,
492 int size,
493 int16_t frame_complete,
494 int frame_size,
495 OopMapSet* oop_maps,
496 bool caller_must_gc_arguments
497 );
498
499 void* operator new(size_t s, unsigned size) throw();
500
501 public:
502 static const int ENTRY_COUNT = 1;
503 // Creation
504 static RuntimeStub* new_runtime_stub(
505 const char* stub_name,
506 CodeBuffer* cb,
507 int16_t frame_complete,
508 int frame_size,
509 OopMapSet* oop_maps,
510 bool caller_must_gc_arguments,
511 bool alloc_fail_is_fatal=true
512 );
513
514 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
515
516 address entry_point() const { return code_begin(); }
517
518 void print_on_impl(outputStream* st) const;
519 void print_value_on_impl(outputStream* st) const;
520
521 class Vptr : public RuntimeBlob::Vptr {
522 void print_on(const CodeBlob* instance, outputStream* st) const override {
523 instance->as_runtime_stub()->print_on_impl(st);
524 }
525 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
526 instance->as_runtime_stub()->print_value_on_impl(st);
527 }
528 };
529
530 static const Vptr _vpntr;
531 };
532
533
534 //----------------------------------------------------------------------------------------------------
535 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
536
537 class SingletonBlob: public RuntimeBlob {
538 friend class VMStructs;
539
540 protected:
541 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
542
543 public:
544 SingletonBlob(
545 const char* name,
546 CodeBlobKind kind,
547 CodeBuffer* cb,
548 int size,
549 uint16_t header_size,
550 int frame_size,
551 OopMapSet* oop_maps
552 )
553 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
554 {};
555
556 address entry_point() { return code_begin(); }
557
558 void print_on_impl(outputStream* st) const;
559 void print_value_on_impl(outputStream* st) const;
560
561 class Vptr : public RuntimeBlob::Vptr {
562 void print_on(const CodeBlob* instance, outputStream* st) const override {
563 ((const SingletonBlob*)instance)->print_on_impl(st);
564 }
565 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
566 ((const SingletonBlob*)instance)->print_value_on_impl(st);
567 }
568 };
569
570 static const Vptr _vpntr;
571 };
572
573
574 //----------------------------------------------------------------------------------------------------
575 // DeoptimizationBlob
576
577 class DeoptimizationBlob: public SingletonBlob {
578 friend class VMStructs;
579 friend class JVMCIVMStructs;
580 private:
581 int _unpack_offset;
582 int _unpack_with_exception;
583 int _unpack_with_reexecution;
584
585 int _unpack_with_exception_in_tls;
586
587 #if INCLUDE_JVMCI
588 // Offsets when JVMCI calls uncommon_trap.
589 int _uncommon_trap_offset;
590 int _implicit_exception_uncommon_trap_offset;
591 #endif
592
593 // Creation support
594 DeoptimizationBlob(
595 CodeBuffer* cb,
596 int size,
597 OopMapSet* oop_maps,
598 int unpack_offset,
599 int unpack_with_exception_offset,
600 int unpack_with_reexecution_offset,
601 int frame_size
602 );
603
604 public:
605 static const int ENTRY_COUNT = 4 JVMTI_ONLY(+ 2);
606 // Creation
607 static DeoptimizationBlob* create(
608 CodeBuffer* cb,
609 OopMapSet* oop_maps,
610 int unpack_offset,
611 int unpack_with_exception_offset,
612 int unpack_with_reexecution_offset,
613 int frame_size
614 );
615
616 address unpack() const { return code_begin() + _unpack_offset; }
617 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
618 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
619
620 // Alternate entry point for C1 where the exception and issuing pc
621 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
622 // instead of being in registers. This is needed because C1 doesn't
623 // model exception paths in a way that keeps these registers free so
624 // there may be live values in those registers during deopt.
625 void set_unpack_with_exception_in_tls_offset(int offset) {
626 _unpack_with_exception_in_tls = offset;
627 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
628 }
629 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
630
631 #if INCLUDE_JVMCI
632 // Offsets when JVMCI calls uncommon_trap.
633 void set_uncommon_trap_offset(int offset) {
634 _uncommon_trap_offset = offset;
635 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
636 }
637 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
638
639 void set_implicit_exception_uncommon_trap_offset(int offset) {
640 _implicit_exception_uncommon_trap_offset = offset;
641 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
642 }
643 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
644 #endif // INCLUDE_JVMCI
645
646 void print_value_on_impl(outputStream* st) const;
647
648 class Vptr : public SingletonBlob::Vptr {
649 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
650 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
651 }
652 };
653
654 static const Vptr _vpntr;
655 };
656
657
658 //----------------------------------------------------------------------------------------------------
659 // UncommonTrapBlob (currently only used by Compiler 2)
660
661 #ifdef COMPILER2
662
663 class UncommonTrapBlob: public SingletonBlob {
664 friend class VMStructs;
665 private:
666 // Creation support
667 UncommonTrapBlob(
668 CodeBuffer* cb,
669 int size,
670 OopMapSet* oop_maps,
671 int frame_size
672 );
673
674 public:
675 // Creation
676 static UncommonTrapBlob* create(
677 CodeBuffer* cb,
678 OopMapSet* oop_maps,
679 int frame_size
680 );
681 };
682
683
684 //----------------------------------------------------------------------------------------------------
685 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
686
687 class ExceptionBlob: public SingletonBlob {
688 friend class VMStructs;
689 private:
690 // Creation support
691 ExceptionBlob(
692 CodeBuffer* cb,
693 int size,
694 OopMapSet* oop_maps,
695 int frame_size
696 );
697
698 public:
699 // Creation
700 static ExceptionBlob* create(
701 CodeBuffer* cb,
702 OopMapSet* oop_maps,
703 int frame_size
704 );
705
706 void post_restore_impl() {
707 trace_new_stub(this, "ExceptionBlob");
708 }
709
710 class Vptr : public SingletonBlob::Vptr {
711 void post_restore(CodeBlob* instance) const override {
712 ((ExceptionBlob*)instance)->post_restore_impl();
713 }
714 };
715
716 static const Vptr _vpntr;
717 };
718 #endif // COMPILER2
719
720
721 //----------------------------------------------------------------------------------------------------
722 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
723
724 class SafepointBlob: public SingletonBlob {
725 friend class VMStructs;
726 private:
727 // Creation support
728 SafepointBlob(
729 CodeBuffer* cb,
730 int size,
731 OopMapSet* oop_maps,
732 int frame_size
733 );
734
735 public:
736 static const int ENTRY_COUNT = 1;
737 // Creation
738 static SafepointBlob* create(
739 CodeBuffer* cb,
740 OopMapSet* oop_maps,
741 int frame_size
742 );
743 };
744
745 //----------------------------------------------------------------------------------------------------
746
747 class UpcallLinker;
748
749 // A (Panama) upcall stub. Not used by JNI.
750 class UpcallStub: public RuntimeBlob {
751 friend class VMStructs;
752 friend class UpcallLinker;
753 private:
754 jobject _receiver;
755 ByteSize _frame_data_offset;
756
757 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
758
759 void* operator new(size_t s, unsigned size) throw();
760
761 struct FrameData {
762 JavaFrameAnchor jfa;
763 JavaThread* thread;
764 JNIHandleBlock* old_handles;
765 JNIHandleBlock* new_handles;
766 };
767
768 // defined in frame_ARCH.cpp
769 FrameData* frame_data_for_frame(const frame& frame) const;
770 public:
771 // Creation
772 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
773
774 static void free(UpcallStub* blob);
775
776 jobject receiver() { return _receiver; }
777
778 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
779
780 // GC support
781 void oops_do(OopClosure* f, const frame& frame);
782
783 void print_on_impl(outputStream* st) const;
784 void print_value_on_impl(outputStream* st) const;
785
786 class Vptr : public RuntimeBlob::Vptr {
787 void print_on(const CodeBlob* instance, outputStream* st) const override {
788 instance->as_upcall_stub()->print_on_impl(st);
789 }
790 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
791 instance->as_upcall_stub()->print_value_on_impl(st);
792 }
793 };
794
795 static const Vptr _vpntr;
796 };
797
798 #endif // SHARE_CODE_CODEBLOB_HPP