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 "code/aotCodeCache.hpp"
30 #include "compiler/compilerDefinitions.hpp"
31 #include "compiler/oopMap.hpp"
32 #include "runtime/javaFrameAnchor.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/handles.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/macros.hpp"
37
38 class ImmutableOopMap;
39 class ImmutableOopMapSet;
40 class JNIHandleBlock;
41 class OopMapSet;
42
43 // CodeBlob Types
44 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
45 enum class CodeBlobType {
46 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
47 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
48 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
49 All = 3, // All types (No code cache segmentation)
50 NumTypes = 4 // Number of CodeBlobTypes
51 };
52
53 // CodeBlob - superclass for all entries in the CodeCache.
54 //
55 // Subtypes are:
56 // nmethod : JIT Compiled Java methods
57 // RuntimeBlob : Non-compiled method code; generated glue code
58 // BufferBlob : Used for non-relocatable code such as interpreter, stubroutines, etc.
59 // AdapterBlob : Used to hold C2I/I2C adapters
60 // VtableBlob : Used for holding vtable chunks
61 // MethodHandlesAdapterBlob : Used to hold MethodHandles adapters
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 RuntimeStub,
88 Deoptimization,
89 Safepoint,
90 #ifdef COMPILER2
91 Exception,
92 UncommonTrap,
93 #endif
94 Upcall,
95 Number_Of_Kinds
96 };
97
98 class UpcallStub; // for as_upcall_stub()
99 class RuntimeStub; // for as_runtime_stub()
100 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
101 class AdapterBlob;
102 class ExceptionBlob;
103 class DeoptimizationBlob;
104 class SafepointBlob;
105 class UncommonTrapBlob;
106
107 class CodeBlob {
108 friend class VMStructs;
109 friend class JVMCIVMStructs;
110
111 private:
112 void restore_mutable_data(address reloc_data);
113
114 protected:
115 // order fields from large to small to minimize padding between fields
116 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
117 const char* _name;
118 address _mutable_data;
119
120 int _size; // total size of CodeBlob in bytes
121 int _relocation_size; // size of relocation (could be bigger than 64Kb)
122 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
123 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
124 int _data_offset; // offset to where data region begins
125 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
126 int _mutable_data_size;
127
128 S390_ONLY(int _ctable_offset;)
129
130 uint16_t _header_size; // size of header (depends on subclass)
131 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
132 // not finished setting up their frame. Beware of pc's in
133 // that range. There is a similar range(s) on returns
134 // which we don't detect.
135
136 CodeBlobKind _kind; // Kind of this code blob
137
138 bool _caller_must_gc_arguments;
139
140 #ifndef PRODUCT
141 AsmRemarks _asm_remarks;
142 DbgStrings _dbg_strings;
143 #endif
144
145 void print_on_impl(outputStream* st) const;
146 void print_value_on_impl(outputStream* st) const;
147
148 class Vptr {
149 public:
150 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0;
151 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0;
152 virtual void prepare_for_archiving(CodeBlob* instance) const {
153 instance->prepare_for_archiving_impl();
154 };
155 virtual void post_restore(CodeBlob* instance) const {
156 instance->post_restore_impl();
157 };
158 };
159
160 static const Vptr* vptr(CodeBlobKind kind);
161 const Vptr* vptr() const;
162
163 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
164 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
165 int mutable_data_size);
166
167 // Simple CodeBlob used for simple BufferBlob.
168 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size);
169
170
171 void operator delete(void* p) { }
172
173 void prepare_for_archiving_impl();
174 void post_restore_impl();
175
176 public:
177
178 ~CodeBlob() {
179 assert(_oop_maps == nullptr || AOTCodeCache::is_address_in_aot_cache((address)_oop_maps), "Not flushed");
180 }
181
182 // Returns the space needed for CodeBlob
183 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
184 static unsigned int align_code_offset(int offset);
185
186 // Deletion
187 void purge();
188
189 // Typing
190 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
191 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
192 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; }
193 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
194 #ifdef COMPILER2
195 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; }
196 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
197 #else
198 bool is_uncommon_trap_stub() const { return false; }
199 bool is_exception_stub() const { return false; }
200 #endif
201 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
202 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
203 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
204 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; }
205 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
206
207 // Casting
208 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; }
209 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
210 CodeBlob* as_codeblob() const { return (CodeBlob*) this; }
211 AdapterBlob* as_adapter_blob() const { assert(is_adapter_blob(), "must be adapter blob"); return (AdapterBlob*) this; }
212 ExceptionBlob* as_exception_blob() const { assert(is_exception_stub(), "must be exception stub"); return (ExceptionBlob*) this; }
213 DeoptimizationBlob* as_deoptimization_blob() const { assert(is_deoptimization_stub(), "must be deopt stub"); return (DeoptimizationBlob*) this; }
214 SafepointBlob* as_safepoint_blob() const { assert(is_safepoint_stub(), "must be safepoint stub"); return (SafepointBlob*) this; }
215 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
216 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
217 UncommonTrapBlob* as_uncommon_trap_blob() const { assert(is_uncommon_trap_stub(), "must be uncommon trap stub"); return (UncommonTrapBlob*) this; }
218
219 // Boundaries
220 address header_begin() const { return (address) this; }
221 address header_end() const { return ((address) this) + _header_size; }
222 address content_begin() const { return (address) header_begin() + _content_offset; }
223 address content_end() const { return (address) header_begin() + _data_offset; }
224 address code_begin() const { return (address) header_begin() + _code_offset; }
225 address code_end() const { return (address) header_begin() + _data_offset; }
226 address data_begin() const { return (address) header_begin() + _data_offset; }
227 address data_end() const { return (address) header_begin() + _size; }
228 address blob_end() const { return (address) header_begin() + _size; }
229 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
230
231 int mutable_data_size() const { return _mutable_data_size; }
232 address mutable_data_begin() const { return _mutable_data; }
233 address mutable_data_end() const { return _mutable_data + _mutable_data_size; }
234
235 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; }
236 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); }
237
238 // Offsets
239 int content_offset() const { return _content_offset; }
240 int code_offset() const { return _code_offset; }
241
242 // This field holds the beginning of the const section in the old code buffer.
243 // It is needed to fix relocations of pc-relative loads when resizing the
244 // the constant pool or moving it.
245 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
246 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
247
248 // Sizes
249 int size() const { return _size; }
250 int header_size() const { return _header_size; }
251 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
252 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
253 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
254
255 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
256 void adjust_size(size_t used) {
257 _size = (int)used;
258 _data_offset = _size;
259 }
260
261 // Containment
262 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); }
263 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
264 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
265 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
266 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
267 int frame_complete_offset() const { return _frame_complete_offset; }
268
269 // OopMap for frame
270 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
271 void set_oop_maps(OopMapSet* p);
272 void set_oop_maps(ImmutableOopMapSet* p) { _oop_maps = p; }
273
274 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
275 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
276
277 // Frame support. Sizes are in word units.
278 int frame_size() const { return _frame_size; }
279 void set_frame_size(int size) { _frame_size = size; }
280
281 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
282 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
283
284 // Naming
285 const char* name() const { return _name; }
286 void set_name(const char* name) { _name = name; }
287
288 // Debugging
289 void verify();
290 void print() const;
291 void print_on(outputStream* st) const;
292 void print_value_on(outputStream* st) const;
293
294 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
295 void print_code_on(outputStream* st);
296
297 // Print to stream, any comments associated with offset.
298 void print_block_comment(outputStream* stream, address block_begin) const;
299
300 #ifndef PRODUCT
301 AsmRemarks &asm_remarks() { return _asm_remarks; }
302 DbgStrings &dbg_strings() { return _dbg_strings; }
303
304 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
305 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
306 #endif
307
308 void copy_to(address buffer) {
309 memcpy(buffer, this, this->size());
310 }
311
312 // methods to archive a blob into AOT code cache
313 void prepare_for_archiving();
314 static void archive_blob(CodeBlob* blob, address archive_buffer);
315
316 // methods to restore a blob from AOT code cache into the CodeCache
317 void post_restore();
318 CodeBlob* restore(address code_cache_buffer, const char* name, address archived_reloc_data, ImmutableOopMapSet* archived_oop_maps);
319 static CodeBlob* create(CodeBlob* archived_blob,
320 const char* name,
321 address archived_reloc_data,
322 ImmutableOopMapSet* archived_oop_maps
323 #ifndef PRODUCT
324 , AsmRemarks& archived_asm_remarks
325 , DbgStrings& archived_dbg_strings
326 #endif // PRODUCT
327 );
328 };
329
330 //----------------------------------------------------------------------------------------------------
331 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
332
333 class RuntimeBlob : public CodeBlob {
334 friend class VMStructs;
335 public:
336
337 // Creation
338 // a) simple CodeBlob
339 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
340 : CodeBlob(name, kind, size, header_size)
341 {}
342
343 // b) full CodeBlob
344 // frame_complete is the offset from the beginning of the instructions
345 // to where the frame setup (from stackwalk viewpoint) is complete.
346 RuntimeBlob(
347 const char* name,
348 CodeBlobKind kind,
349 CodeBuffer* cb,
350 int size,
351 uint16_t header_size,
352 int16_t frame_complete,
353 int frame_size,
354 OopMapSet* oop_maps,
355 bool caller_must_gc_arguments = false
356 );
357
358 static void free(RuntimeBlob* blob);
359
360 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
361 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
362
363 class Vptr : public CodeBlob::Vptr {
364 };
365 };
366
367 class WhiteBox;
368 //----------------------------------------------------------------------------------------------------
369 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
370
371 class BufferBlob: public RuntimeBlob {
372 friend class VMStructs;
373 friend class AdapterBlob;
374 friend class VtableBlob;
375 friend class MethodHandlesAdapterBlob;
376 friend class UpcallStub;
377 friend class WhiteBox;
378
379 private:
380 // Creation support
381 BufferBlob(const char* name, CodeBlobKind kind, int size);
382 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size);
383
384 void* operator new(size_t s, unsigned size) throw();
385
386 public:
387 // Creation
388 static BufferBlob* create(const char* name, uint buffer_size);
389 static BufferBlob* create(const char* name, CodeBuffer* cb);
390
391 static void free(BufferBlob* buf);
392
393 void print_on_impl(outputStream* st) const;
394 void print_value_on_impl(outputStream* st) const;
395
396 class Vptr : public RuntimeBlob::Vptr {
397 void print_on(const CodeBlob* instance, outputStream* st) const override {
398 ((const BufferBlob*)instance)->print_on_impl(st);
399 }
400 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
401 ((const BufferBlob*)instance)->print_value_on_impl(st);
402 }
403 };
404
405 static const Vptr _vpntr;
406 };
407
408
409 //----------------------------------------------------------------------------------------------------
410 // AdapterBlob: used to hold C2I/I2C adapters
411
412 class AdapterBlob: public BufferBlob {
413 private:
414 AdapterBlob(int size, CodeBuffer* cb);
415
416 public:
417 // Creation
418 static AdapterBlob* create(CodeBuffer* cb);
419 };
420
421 //---------------------------------------------------------------------------------------------------
422 class VtableBlob: public BufferBlob {
423 private:
424 VtableBlob(const char*, int);
425
426 void* operator new(size_t s, unsigned size) throw();
427
428 public:
429 // Creation
430 static VtableBlob* create(const char* name, int buffer_size);
431 };
432
433 //----------------------------------------------------------------------------------------------------
434 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
435
436 class MethodHandlesAdapterBlob: public BufferBlob {
437 private:
438 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
439
440 public:
441 // Creation
442 static MethodHandlesAdapterBlob* create(int buffer_size);
443 };
444
445
446 //----------------------------------------------------------------------------------------------------
447 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
448
449 class RuntimeStub: public RuntimeBlob {
450 friend class VMStructs;
451 private:
452 // Creation support
453 RuntimeStub(
454 const char* name,
455 CodeBuffer* cb,
456 int size,
457 int16_t frame_complete,
458 int frame_size,
459 OopMapSet* oop_maps,
460 bool caller_must_gc_arguments
461 );
462
463 void* operator new(size_t s, unsigned size) throw();
464
465 public:
466 // Creation
467 static RuntimeStub* new_runtime_stub(
468 const char* stub_name,
469 CodeBuffer* cb,
470 int16_t frame_complete,
471 int frame_size,
472 OopMapSet* oop_maps,
473 bool caller_must_gc_arguments,
474 bool alloc_fail_is_fatal=true
475 );
476
477 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
478
479 address entry_point() const { return code_begin(); }
480
481 void print_on_impl(outputStream* st) const;
482 void print_value_on_impl(outputStream* st) const;
483
484 class Vptr : public RuntimeBlob::Vptr {
485 void print_on(const CodeBlob* instance, outputStream* st) const override {
486 instance->as_runtime_stub()->print_on_impl(st);
487 }
488 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
489 instance->as_runtime_stub()->print_value_on_impl(st);
490 }
491 };
492
493 static const Vptr _vpntr;
494 };
495
496
497 //----------------------------------------------------------------------------------------------------
498 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
499
500 class SingletonBlob: public RuntimeBlob {
501 friend class VMStructs;
502
503 protected:
504 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
505
506 public:
507 SingletonBlob(
508 const char* name,
509 CodeBlobKind kind,
510 CodeBuffer* cb,
511 int size,
512 uint16_t header_size,
513 int frame_size,
514 OopMapSet* oop_maps
515 )
516 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
517 {};
518
519 address entry_point() { return code_begin(); }
520
521 void print_on_impl(outputStream* st) const;
522 void print_value_on_impl(outputStream* st) const;
523
524 class Vptr : public RuntimeBlob::Vptr {
525 void print_on(const CodeBlob* instance, outputStream* st) const override {
526 ((const SingletonBlob*)instance)->print_on_impl(st);
527 }
528 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
529 ((const SingletonBlob*)instance)->print_value_on_impl(st);
530 }
531 };
532
533 static const Vptr _vpntr;
534 };
535
536
537 //----------------------------------------------------------------------------------------------------
538 // DeoptimizationBlob
539
540 class DeoptimizationBlob: public SingletonBlob {
541 friend class VMStructs;
542 friend class JVMCIVMStructs;
543 private:
544 int _unpack_offset;
545 int _unpack_with_exception;
546 int _unpack_with_reexecution;
547
548 int _unpack_with_exception_in_tls;
549
550 #if INCLUDE_JVMCI
551 // Offsets when JVMCI calls uncommon_trap.
552 int _uncommon_trap_offset;
553 int _implicit_exception_uncommon_trap_offset;
554 #endif
555
556 // Creation support
557 DeoptimizationBlob(
558 CodeBuffer* cb,
559 int size,
560 OopMapSet* oop_maps,
561 int unpack_offset,
562 int unpack_with_exception_offset,
563 int unpack_with_reexecution_offset,
564 int frame_size
565 );
566
567 public:
568 // Creation
569 static DeoptimizationBlob* create(
570 CodeBuffer* cb,
571 OopMapSet* oop_maps,
572 int unpack_offset,
573 int unpack_with_exception_offset,
574 int unpack_with_reexecution_offset,
575 int frame_size
576 );
577
578 address unpack() const { return code_begin() + _unpack_offset; }
579 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
580 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
581
582 // Alternate entry point for C1 where the exception and issuing pc
583 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
584 // instead of being in registers. This is needed because C1 doesn't
585 // model exception paths in a way that keeps these registers free so
586 // there may be live values in those registers during deopt.
587 void set_unpack_with_exception_in_tls_offset(int offset) {
588 _unpack_with_exception_in_tls = offset;
589 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
590 }
591 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
592
593 #if INCLUDE_JVMCI
594 // Offsets when JVMCI calls uncommon_trap.
595 void set_uncommon_trap_offset(int offset) {
596 _uncommon_trap_offset = offset;
597 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
598 }
599 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
600
601 void set_implicit_exception_uncommon_trap_offset(int offset) {
602 _implicit_exception_uncommon_trap_offset = offset;
603 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
604 }
605 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
606 #endif // INCLUDE_JVMCI
607
608 void print_value_on_impl(outputStream* st) const;
609
610 class Vptr : public SingletonBlob::Vptr {
611 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
612 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
613 }
614 };
615
616 static const Vptr _vpntr;
617 };
618
619
620 //----------------------------------------------------------------------------------------------------
621 // UncommonTrapBlob (currently only used by Compiler 2)
622
623 #ifdef COMPILER2
624
625 class UncommonTrapBlob: public SingletonBlob {
626 friend class VMStructs;
627 private:
628 // Creation support
629 UncommonTrapBlob(
630 CodeBuffer* cb,
631 int size,
632 OopMapSet* oop_maps,
633 int frame_size
634 );
635
636 public:
637 // Creation
638 static UncommonTrapBlob* create(
639 CodeBuffer* cb,
640 OopMapSet* oop_maps,
641 int frame_size
642 );
643 };
644
645
646 //----------------------------------------------------------------------------------------------------
647 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
648
649 class ExceptionBlob: public SingletonBlob {
650 friend class VMStructs;
651 private:
652 // Creation support
653 ExceptionBlob(
654 CodeBuffer* cb,
655 int size,
656 OopMapSet* oop_maps,
657 int frame_size
658 );
659
660 public:
661 // Creation
662 static ExceptionBlob* create(
663 CodeBuffer* cb,
664 OopMapSet* oop_maps,
665 int frame_size
666 );
667
668 void post_restore_impl() {
669 trace_new_stub(this, "ExceptionBlob");
670 }
671
672 class Vptr : public SingletonBlob::Vptr {
673 void post_restore(CodeBlob* instance) const override {
674 ((ExceptionBlob*)instance)->post_restore_impl();
675 }
676 };
677
678 static const Vptr _vpntr;
679 };
680 #endif // COMPILER2
681
682
683 //----------------------------------------------------------------------------------------------------
684 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
685
686 class SafepointBlob: public SingletonBlob {
687 friend class VMStructs;
688 private:
689 // Creation support
690 SafepointBlob(
691 CodeBuffer* cb,
692 int size,
693 OopMapSet* oop_maps,
694 int frame_size
695 );
696
697 public:
698 // Creation
699 static SafepointBlob* create(
700 CodeBuffer* cb,
701 OopMapSet* oop_maps,
702 int frame_size
703 );
704 };
705
706 //----------------------------------------------------------------------------------------------------
707
708 class UpcallLinker;
709
710 // A (Panama) upcall stub. Not used by JNI.
711 class UpcallStub: public RuntimeBlob {
712 friend class VMStructs;
713 friend class UpcallLinker;
714 private:
715 jobject _receiver;
716 ByteSize _frame_data_offset;
717
718 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
719
720 void* operator new(size_t s, unsigned size) throw();
721
722 struct FrameData {
723 JavaFrameAnchor jfa;
724 JavaThread* thread;
725 JNIHandleBlock* old_handles;
726 JNIHandleBlock* new_handles;
727 };
728
729 // defined in frame_ARCH.cpp
730 FrameData* frame_data_for_frame(const frame& frame) const;
731 public:
732 // Creation
733 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
734
735 static void free(UpcallStub* blob);
736
737 jobject receiver() { return _receiver; }
738
739 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
740
741 // GC support
742 void oops_do(OopClosure* f, const frame& frame);
743
744 void print_on_impl(outputStream* st) const;
745 void print_value_on_impl(outputStream* st) const;
746
747 class Vptr : public RuntimeBlob::Vptr {
748 void print_on(const CodeBlob* instance, outputStream* st) const override {
749 instance->as_upcall_stub()->print_on_impl(st);
750 }
751 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
752 instance->as_upcall_stub()->print_value_on_impl(st);
753 }
754 };
755
756 static const Vptr _vpntr;
757 };
758
759 #endif // SHARE_CODE_CODEBLOB_HPP