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 };
324
325 //----------------------------------------------------------------------------------------------------
326 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
327
328 class RuntimeBlob : public CodeBlob {
329 friend class VMStructs;
330 public:
331
332 // Creation
333 // a) simple CodeBlob
334 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
335 : CodeBlob(name, kind, size, header_size)
336 {}
337
338 // b) full CodeBlob
339 // frame_complete is the offset from the beginning of the instructions
340 // to where the frame setup (from stackwalk viewpoint) is complete.
341 RuntimeBlob(
342 const char* name,
343 CodeBlobKind kind,
344 CodeBuffer* cb,
345 int size,
346 uint16_t header_size,
347 int16_t frame_complete,
348 int frame_size,
349 OopMapSet* oop_maps,
350 bool caller_must_gc_arguments = false
351 );
352
353 static void free(RuntimeBlob* blob);
354
355 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
356 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
357
358 class Vptr : public CodeBlob::Vptr {
359 };
360 };
361
362 class WhiteBox;
363 //----------------------------------------------------------------------------------------------------
364 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
365
366 class BufferBlob: public RuntimeBlob {
367 friend class VMStructs;
368 friend class AdapterBlob;
369 friend class VtableBlob;
370 friend class MethodHandlesAdapterBlob;
371 friend class UpcallStub;
372 friend class WhiteBox;
373
374 private:
375 // Creation support
376 BufferBlob(const char* name, CodeBlobKind kind, int size);
377 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size);
378
379 void* operator new(size_t s, unsigned size) throw();
380
381 public:
382 // Creation
383 static BufferBlob* create(const char* name, uint buffer_size);
384 static BufferBlob* create(const char* name, CodeBuffer* cb);
385
386 static void free(BufferBlob* buf);
387
388 void print_on_impl(outputStream* st) const;
389 void print_value_on_impl(outputStream* st) const;
390
391 class Vptr : public RuntimeBlob::Vptr {
392 void print_on(const CodeBlob* instance, outputStream* st) const override {
393 ((const BufferBlob*)instance)->print_on_impl(st);
394 }
395 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
396 ((const BufferBlob*)instance)->print_value_on_impl(st);
397 }
398 };
399
400 static const Vptr _vpntr;
401 };
402
403
404 //----------------------------------------------------------------------------------------------------
405 // AdapterBlob: used to hold C2I/I2C adapters
406
407 class AdapterBlob: public BufferBlob {
408 private:
409 AdapterBlob(int size, CodeBuffer* cb);
410
411 public:
412 // Creation
413 static AdapterBlob* create(CodeBuffer* cb);
414 };
415
416 //---------------------------------------------------------------------------------------------------
417 class VtableBlob: public BufferBlob {
418 private:
419 VtableBlob(const char*, int);
420
421 void* operator new(size_t s, unsigned size) throw();
422
423 public:
424 // Creation
425 static VtableBlob* create(const char* name, int buffer_size);
426 };
427
428 //----------------------------------------------------------------------------------------------------
429 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
430
431 class MethodHandlesAdapterBlob: public BufferBlob {
432 private:
433 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {}
434
435 public:
436 // Creation
437 static MethodHandlesAdapterBlob* create(int buffer_size);
438 };
439
440
441 //----------------------------------------------------------------------------------------------------
442 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
443
444 class RuntimeStub: public RuntimeBlob {
445 friend class VMStructs;
446 private:
447 // Creation support
448 RuntimeStub(
449 const char* name,
450 CodeBuffer* cb,
451 int size,
452 int16_t frame_complete,
453 int frame_size,
454 OopMapSet* oop_maps,
455 bool caller_must_gc_arguments
456 );
457
458 void* operator new(size_t s, unsigned size) throw();
459
460 public:
461 // Creation
462 static RuntimeStub* new_runtime_stub(
463 const char* stub_name,
464 CodeBuffer* cb,
465 int16_t frame_complete,
466 int frame_size,
467 OopMapSet* oop_maps,
468 bool caller_must_gc_arguments,
469 bool alloc_fail_is_fatal=true
470 );
471
472 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
473
474 address entry_point() const { return code_begin(); }
475
476 void print_on_impl(outputStream* st) const;
477 void print_value_on_impl(outputStream* st) const;
478
479 class Vptr : public RuntimeBlob::Vptr {
480 void print_on(const CodeBlob* instance, outputStream* st) const override {
481 instance->as_runtime_stub()->print_on_impl(st);
482 }
483 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
484 instance->as_runtime_stub()->print_value_on_impl(st);
485 }
486 };
487
488 static const Vptr _vpntr;
489 };
490
491
492 //----------------------------------------------------------------------------------------------------
493 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
494
495 class SingletonBlob: public RuntimeBlob {
496 friend class VMStructs;
497
498 protected:
499 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw();
500
501 public:
502 SingletonBlob(
503 const char* name,
504 CodeBlobKind kind,
505 CodeBuffer* cb,
506 int size,
507 uint16_t header_size,
508 int frame_size,
509 OopMapSet* oop_maps
510 )
511 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
512 {};
513
514 address entry_point() { return code_begin(); }
515
516 void print_on_impl(outputStream* st) const;
517 void print_value_on_impl(outputStream* st) const;
518
519 class Vptr : public RuntimeBlob::Vptr {
520 void print_on(const CodeBlob* instance, outputStream* st) const override {
521 ((const SingletonBlob*)instance)->print_on_impl(st);
522 }
523 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
524 ((const SingletonBlob*)instance)->print_value_on_impl(st);
525 }
526 };
527
528 static const Vptr _vpntr;
529 };
530
531
532 //----------------------------------------------------------------------------------------------------
533 // DeoptimizationBlob
534
535 class DeoptimizationBlob: public SingletonBlob {
536 friend class VMStructs;
537 friend class JVMCIVMStructs;
538 private:
539 int _unpack_offset;
540 int _unpack_with_exception;
541 int _unpack_with_reexecution;
542
543 int _unpack_with_exception_in_tls;
544
545 #if INCLUDE_JVMCI
546 // Offsets when JVMCI calls uncommon_trap.
547 int _uncommon_trap_offset;
548 int _implicit_exception_uncommon_trap_offset;
549 #endif
550
551 // Creation support
552 DeoptimizationBlob(
553 CodeBuffer* cb,
554 int size,
555 OopMapSet* oop_maps,
556 int unpack_offset,
557 int unpack_with_exception_offset,
558 int unpack_with_reexecution_offset,
559 int frame_size
560 );
561
562 public:
563 // Creation
564 static DeoptimizationBlob* create(
565 CodeBuffer* cb,
566 OopMapSet* oop_maps,
567 int unpack_offset,
568 int unpack_with_exception_offset,
569 int unpack_with_reexecution_offset,
570 int frame_size
571 );
572
573 address unpack() const { return code_begin() + _unpack_offset; }
574 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
575 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
576
577 // Alternate entry point for C1 where the exception and issuing pc
578 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
579 // instead of being in registers. This is needed because C1 doesn't
580 // model exception paths in a way that keeps these registers free so
581 // there may be live values in those registers during deopt.
582 void set_unpack_with_exception_in_tls_offset(int offset) {
583 _unpack_with_exception_in_tls = offset;
584 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
585 }
586 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
587
588 #if INCLUDE_JVMCI
589 // Offsets when JVMCI calls uncommon_trap.
590 void set_uncommon_trap_offset(int offset) {
591 _uncommon_trap_offset = offset;
592 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
593 }
594 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
595
596 void set_implicit_exception_uncommon_trap_offset(int offset) {
597 _implicit_exception_uncommon_trap_offset = offset;
598 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
599 }
600 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
601 #endif // INCLUDE_JVMCI
602
603 void print_value_on_impl(outputStream* st) const;
604
605 class Vptr : public SingletonBlob::Vptr {
606 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
607 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st);
608 }
609 };
610
611 static const Vptr _vpntr;
612 };
613
614
615 //----------------------------------------------------------------------------------------------------
616 // UncommonTrapBlob (currently only used by Compiler 2)
617
618 #ifdef COMPILER2
619
620 class UncommonTrapBlob: public SingletonBlob {
621 friend class VMStructs;
622 private:
623 // Creation support
624 UncommonTrapBlob(
625 CodeBuffer* cb,
626 int size,
627 OopMapSet* oop_maps,
628 int frame_size
629 );
630
631 public:
632 // Creation
633 static UncommonTrapBlob* create(
634 CodeBuffer* cb,
635 OopMapSet* oop_maps,
636 int frame_size
637 );
638 };
639
640
641 //----------------------------------------------------------------------------------------------------
642 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
643
644 class ExceptionBlob: public SingletonBlob {
645 friend class VMStructs;
646 private:
647 // Creation support
648 ExceptionBlob(
649 CodeBuffer* cb,
650 int size,
651 OopMapSet* oop_maps,
652 int frame_size
653 );
654
655 public:
656 // Creation
657 static ExceptionBlob* create(
658 CodeBuffer* cb,
659 OopMapSet* oop_maps,
660 int frame_size
661 );
662
663 void post_restore_impl() {
664 trace_new_stub(this, "ExceptionBlob");
665 }
666
667 class Vptr : public SingletonBlob::Vptr {
668 void post_restore(CodeBlob* instance) const override {
669 ((ExceptionBlob*)instance)->post_restore_impl();
670 }
671 };
672
673 static const Vptr _vpntr;
674 };
675 #endif // COMPILER2
676
677
678 //----------------------------------------------------------------------------------------------------
679 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
680
681 class SafepointBlob: public SingletonBlob {
682 friend class VMStructs;
683 private:
684 // Creation support
685 SafepointBlob(
686 CodeBuffer* cb,
687 int size,
688 OopMapSet* oop_maps,
689 int frame_size
690 );
691
692 public:
693 // Creation
694 static SafepointBlob* create(
695 CodeBuffer* cb,
696 OopMapSet* oop_maps,
697 int frame_size
698 );
699 };
700
701 //----------------------------------------------------------------------------------------------------
702
703 class UpcallLinker;
704
705 // A (Panama) upcall stub. Not used by JNI.
706 class UpcallStub: public RuntimeBlob {
707 friend class VMStructs;
708 friend class UpcallLinker;
709 private:
710 jobject _receiver;
711 ByteSize _frame_data_offset;
712
713 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
714
715 void* operator new(size_t s, unsigned size) throw();
716
717 struct FrameData {
718 JavaFrameAnchor jfa;
719 JavaThread* thread;
720 JNIHandleBlock* old_handles;
721 JNIHandleBlock* new_handles;
722 };
723
724 // defined in frame_ARCH.cpp
725 FrameData* frame_data_for_frame(const frame& frame) const;
726 public:
727 // Creation
728 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
729
730 static void free(UpcallStub* blob);
731
732 jobject receiver() { return _receiver; }
733
734 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
735
736 // GC support
737 void oops_do(OopClosure* f, const frame& frame);
738
739 void print_on_impl(outputStream* st) const;
740 void print_value_on_impl(outputStream* st) const;
741
742 class Vptr : public RuntimeBlob::Vptr {
743 void print_on(const CodeBlob* instance, outputStream* st) const override {
744 instance->as_upcall_stub()->print_on_impl(st);
745 }
746 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
747 instance->as_upcall_stub()->print_value_on_impl(st);
748 }
749 };
750
751 static const Vptr _vpntr;
752 };
753
754 #endif // SHARE_CODE_CODEBLOB_HPP