1 /*
2 * Copyright (c) 1998, 2024, 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 // ExceptionBlob : Used for stack unrolling
66 // SafepointBlob : Used to handle illegal instruction exceptions
67 // UncommonTrapBlob : Used to handle uncommon traps
68 // UpcallStub : Used for upcalls from native code
69 //
70 //
71 // Layout : continuous in the CodeCache
72 // - header
73 // - relocation
74 // - content space
75 // - instruction space
76 // - data space
77
78 enum class CodeBlobKind : u1 {
79 None,
80 Nmethod,
81 Buffer,
82 Adapter,
83 Vtable,
84 MH_Adapter,
85 BufferedInlineType,
86 Runtime_Stub,
87 Deoptimization,
88 Exception,
89 Safepoint,
90 Uncommon_Trap,
91 Upcall,
92 Number_Of_Kinds
93 };
94
95 class UpcallStub; // for as_upcall_stub()
96 class RuntimeStub; // for as_runtime_stub()
97 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
98
99 class CodeBlob {
100 friend class VMStructs;
101 friend class JVMCIVMStructs;
102 friend class CodeCacheDumper;
103
104 protected:
105 // order fields from large to small to minimize padding between fields
106 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
107 const char* _name;
108
109 int _size; // total size of CodeBlob in bytes
110 int _header_size; // size of header (depends on subclass)
111 int _relocation_size; // size of relocation
112 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
113 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
114 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
115 // not finished setting up their frame. Beware of pc's in
116 // that range. There is a similar range(s) on returns
117 // which we don't detect.
118 int _data_offset; // offset to where data region begins
119 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
120
121 S390_ONLY(int _ctable_offset;)
122
123 CodeBlobKind _kind; // Kind of this code blob
124
125 bool _caller_must_gc_arguments;
126
127 #ifndef PRODUCT
128 AsmRemarks _asm_remarks;
129 DbgStrings _dbg_strings;
130 #endif // not PRODUCT
131
132 DEBUG_ONLY( void verify_parameters() );
133
134 CodeBlob(const char* name, CodeBlobKind kind, int size, int header_size, int relocation_size,
135 int content_offset, int code_offset, int data_offset, int frame_complete_offset,
136 int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments);
137
138 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int header_size,
139 int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments);
140
141 // Simple CodeBlob used for simple BufferBlob.
142 CodeBlob(const char* name, CodeBlobKind kind, int size, int header_size);
143
144 void operator delete(void* p) { }
145
146 public:
147
148 virtual ~CodeBlob() {
149 assert(_oop_maps == nullptr, "Not flushed");
150 }
151
152 // Returns the space needed for CodeBlob
153 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
154 static unsigned int align_code_offset(int offset);
155
156 // Deletion
157 virtual void purge(bool free_code_cache_data, bool unregister_nmethod);
158
159 // Typing
160 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; }
161 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; }
162 bool is_runtime_stub() const { return _kind == CodeBlobKind::Runtime_Stub; }
163 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; }
164 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::Uncommon_Trap; }
165 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; }
166 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; }
167 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; }
168 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; }
169 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MH_Adapter; }
170 bool is_buffered_inline_type_blob() const { return _kind == CodeBlobKind::BufferedInlineType; }
171 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; }
172
173 // Casting
174 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : nullptr; }
175 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
176 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
177 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
178 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
179
180 // Boundaries
181 address header_begin() const { return (address) this; }
182 address header_end() const { return ((address) this) + _header_size; }
183 relocInfo* relocation_begin() const { return (relocInfo*) header_end(); }
184 relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); }
185 address content_begin() const { return (address) header_begin() + _content_offset; }
186 address content_end() const { return (address) header_begin() + _data_offset; }
187 address code_begin() const { return (address) header_begin() + _code_offset; }
188 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor
189 address code_end() const { return (address) header_begin() + _data_offset; }
190 address data_begin() const { return (address) header_begin() + _data_offset; }
191 address data_end() const { return (address) header_begin() + _size; }
192
193 // Offsets
194 int content_offset() const { return _content_offset; }
195 int code_offset() const { return _code_offset; }
196 int data_offset() const { return _data_offset; }
197
198 // This field holds the beginning of the const section in the old code buffer.
199 // It is needed to fix relocations of pc-relative loads when resizing the
200 // the constant pool or moving it.
201 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
202 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
203
204 // Sizes
205 int size() const { return _size; }
206 int header_size() const { return _header_size; }
207 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
208 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
209 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
210
211 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
212 void adjust_size(size_t used) {
213 _size = (int)used;
214 _data_offset = (int)used;
215 }
216
217 // Containment
218 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
219 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
220 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
221 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
222 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
223 int frame_complete_offset() const { return _frame_complete_offset; }
224
225 // OopMap for frame
226 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
227 void set_oop_maps(OopMapSet* p);
228
229 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
230 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
231 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
232
233 // Frame support. Sizes are in word units.
234 int frame_size() const { return _frame_size; }
235 void set_frame_size(int size) { _frame_size = size; }
236
237 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
238 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
239
240 // Naming
241 const char* name() const { return _name; }
242 void set_name(const char* name) { _name = name; }
243
244 // Debugging
245 virtual void verify() = 0;
246 virtual void print() const;
247 virtual void print_on(outputStream* st) const;
248 virtual void print_value_on(outputStream* st) const;
249 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
250 void print_code_on(outputStream* st);
251
252 // Print to stream, any comments associated with offset.
253 virtual void print_block_comment(outputStream* stream, address block_begin) const {
254 #ifndef PRODUCT
255 ptrdiff_t offset = block_begin - code_begin();
256 assert(offset >= 0, "Expecting non-negative offset!");
257 _asm_remarks.print(uint(offset), stream);
258 #endif
259 }
260
261 #ifndef PRODUCT
262 AsmRemarks &asm_remarks() { return _asm_remarks; }
263 DbgStrings &dbg_strings() { return _dbg_strings; }
264
265 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
266 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
267 #endif
268 };
269
270 //----------------------------------------------------------------------------------------------------
271 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs)
272
273 class RuntimeBlob : public CodeBlob {
274 friend class VMStructs;
275 public:
276
277 // Creation
278 // a) simple CodeBlob
279 RuntimeBlob(const char* name, CodeBlobKind kind, int size, int header_size)
280 : CodeBlob(name, kind, size, header_size)
281 {}
282
283 // b) full CodeBlob
284 // frame_complete is the offset from the beginning of the instructions
285 // to where the frame setup (from stackwalk viewpoint) is complete.
286 RuntimeBlob(
287 const char* name,
288 CodeBlobKind kind,
289 CodeBuffer* cb,
290 int size,
291 int header_size,
292 int frame_complete,
293 int frame_size,
294 OopMapSet* oop_maps,
295 bool caller_must_gc_arguments = false
296 );
297
298 static void free(RuntimeBlob* blob);
299
300 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
301 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
302 };
303
304 class WhiteBox;
305 //----------------------------------------------------------------------------------------------------
306 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
307
308 class BufferBlob: public RuntimeBlob {
309 friend class VMStructs;
310 friend class AdapterBlob;
311 friend class VtableBlob;
312 friend class MethodHandlesAdapterBlob;
313 friend class BufferedInlineTypeBlob;
314 friend class UpcallStub;
315 friend class WhiteBox;
316
317 private:
318 // Creation support
319 BufferBlob(const char* name, CodeBlobKind kind, int size);
320 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int header_size);
321 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);
322
323 void* operator new(size_t s, unsigned size) throw();
324
325 public:
326 // Creation
327 static BufferBlob* create(const char* name, uint buffer_size);
328 static BufferBlob* create(const char* name, CodeBuffer* cb);
329
330 static void free(BufferBlob* buf);
331
332 // GC/Verification support
333 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) override { /* nothing to do */ }
334
335 void verify() override;
336 void print_on(outputStream* st) const override;
337 void print_value_on(outputStream* st) const override;
338 };
339
340
341 //----------------------------------------------------------------------------------------------------
342 // AdapterBlob: used to hold C2I/I2C adapters
343
344 class AdapterBlob: public BufferBlob {
345 private:
346 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false);
347
348 public:
349 // Creation
350 static AdapterBlob* create(CodeBuffer* cb,
351 int frame_complete,
352 int frame_size,
353 OopMapSet* oop_maps,
354 bool caller_must_gc_arguments = false);
355
356 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
357 };
358
359 //---------------------------------------------------------------------------------------------------
360 class VtableBlob: public BufferBlob {
361 private:
362 VtableBlob(const char*, int);
363
364 void* operator new(size_t s, unsigned size) throw();
365
366 public:
367 // Creation
368 static VtableBlob* create(const char* name, int buffer_size);
369 };
370
371 //----------------------------------------------------------------------------------------------------
372 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
373
374 class MethodHandlesAdapterBlob: public BufferBlob {
375 private:
376 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MH_Adapter, size) {}
377
378 public:
379 // Creation
380 static MethodHandlesAdapterBlob* create(int buffer_size);
381 };
382
383 //----------------------------------------------------------------------------------------------------
384 // BufferedInlineTypeBlob : used for pack/unpack handlers
385
386 class BufferedInlineTypeBlob: public BufferBlob {
387 private:
388 const int _pack_fields_off;
389 const int _pack_fields_jobject_off;
390 const int _unpack_fields_off;
391
392 BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
393
394 public:
395 // Creation
396 static BufferedInlineTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off);
397
398 address pack_fields() const { return code_begin() + _pack_fields_off; }
399 address pack_fields_jobject() const { return code_begin() + _pack_fields_jobject_off; }
400 address unpack_fields() const { return code_begin() + _unpack_fields_off; }
401 };
402
403 //----------------------------------------------------------------------------------------------------
404 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
405
406 class RuntimeStub: public RuntimeBlob {
407 friend class VMStructs;
408 private:
409 // Creation support
410 RuntimeStub(
411 const char* name,
412 CodeBuffer* cb,
413 int size,
414 int frame_complete,
415 int frame_size,
416 OopMapSet* oop_maps,
417 bool caller_must_gc_arguments
418 );
419
420 void* operator new(size_t s, unsigned size) throw();
421
422 public:
423 // Creation
424 static RuntimeStub* new_runtime_stub(
425 const char* stub_name,
426 CodeBuffer* cb,
427 int frame_complete,
428 int frame_size,
429 OopMapSet* oop_maps,
430 bool caller_must_gc_arguments,
431 bool alloc_fail_is_fatal=true
432 );
433
434 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
435
436 address entry_point() const { return code_begin(); }
437
438 // GC/Verification support
439 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) override { /* nothing to do */ }
440
441 void verify() override;
442 void print_on(outputStream* st) const override;
443 void print_value_on(outputStream* st) const override;
444 };
445
446
447 //----------------------------------------------------------------------------------------------------
448 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
449
450 class SingletonBlob: public RuntimeBlob {
451 friend class VMStructs;
452
453 protected:
454 void* operator new(size_t s, unsigned size) throw();
455
456 public:
457 SingletonBlob(
458 const char* name,
459 CodeBlobKind kind,
460 CodeBuffer* cb,
461 int size,
462 int header_size,
463 int frame_size,
464 OopMapSet* oop_maps
465 )
466 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
467 {};
468
469 address entry_point() { return code_begin(); }
470
471 // GC/Verification support
472 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) override { /* nothing to do */ }
473 void verify() override; // does nothing
474 void print_on(outputStream* st) const override;
475 void print_value_on(outputStream* st) const override;
476 };
477
478
479 //----------------------------------------------------------------------------------------------------
480 // DeoptimizationBlob
481
482 class DeoptimizationBlob: public SingletonBlob {
483 friend class VMStructs;
484 friend class JVMCIVMStructs;
485 private:
486 int _unpack_offset;
487 int _unpack_with_exception;
488 int _unpack_with_reexecution;
489
490 int _unpack_with_exception_in_tls;
491
492 #if INCLUDE_JVMCI
493 // Offsets when JVMCI calls uncommon_trap.
494 int _uncommon_trap_offset;
495 int _implicit_exception_uncommon_trap_offset;
496 #endif
497
498 // Creation support
499 DeoptimizationBlob(
500 CodeBuffer* cb,
501 int size,
502 OopMapSet* oop_maps,
503 int unpack_offset,
504 int unpack_with_exception_offset,
505 int unpack_with_reexecution_offset,
506 int frame_size
507 );
508
509 public:
510 // Creation
511 static DeoptimizationBlob* create(
512 CodeBuffer* cb,
513 OopMapSet* oop_maps,
514 int unpack_offset,
515 int unpack_with_exception_offset,
516 int unpack_with_reexecution_offset,
517 int frame_size
518 );
519
520 // Printing
521 void print_value_on(outputStream* st) const override;
522
523 address unpack() const { return code_begin() + _unpack_offset; }
524 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
525 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
526
527 // Alternate entry point for C1 where the exception and issuing pc
528 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
529 // instead of being in registers. This is needed because C1 doesn't
530 // model exception paths in a way that keeps these registers free so
531 // there may be live values in those registers during deopt.
532 void set_unpack_with_exception_in_tls_offset(int offset) {
533 _unpack_with_exception_in_tls = offset;
534 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
535 }
536 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
537
538 #if INCLUDE_JVMCI
539 // Offsets when JVMCI calls uncommon_trap.
540 void set_uncommon_trap_offset(int offset) {
541 _uncommon_trap_offset = offset;
542 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
543 }
544 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
545
546 void set_implicit_exception_uncommon_trap_offset(int offset) {
547 _implicit_exception_uncommon_trap_offset = offset;
548 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
549 }
550 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
551 #endif // INCLUDE_JVMCI
552 };
553
554
555 //----------------------------------------------------------------------------------------------------
556 // UncommonTrapBlob (currently only used by Compiler 2)
557
558 #ifdef COMPILER2
559
560 class UncommonTrapBlob: public SingletonBlob {
561 friend class VMStructs;
562 private:
563 // Creation support
564 UncommonTrapBlob(
565 CodeBuffer* cb,
566 int size,
567 OopMapSet* oop_maps,
568 int frame_size
569 );
570
571 public:
572 // Creation
573 static UncommonTrapBlob* create(
574 CodeBuffer* cb,
575 OopMapSet* oop_maps,
576 int frame_size
577 );
578 };
579
580
581 //----------------------------------------------------------------------------------------------------
582 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
583
584 class ExceptionBlob: public SingletonBlob {
585 friend class VMStructs;
586 private:
587 // Creation support
588 ExceptionBlob(
589 CodeBuffer* cb,
590 int size,
591 OopMapSet* oop_maps,
592 int frame_size
593 );
594
595 public:
596 // Creation
597 static ExceptionBlob* create(
598 CodeBuffer* cb,
599 OopMapSet* oop_maps,
600 int frame_size
601 );
602 };
603 #endif // COMPILER2
604
605
606 //----------------------------------------------------------------------------------------------------
607 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
608
609 class SafepointBlob: public SingletonBlob {
610 friend class VMStructs;
611 private:
612 // Creation support
613 SafepointBlob(
614 CodeBuffer* cb,
615 int size,
616 OopMapSet* oop_maps,
617 int frame_size
618 );
619
620 public:
621 // Creation
622 static SafepointBlob* create(
623 CodeBuffer* cb,
624 OopMapSet* oop_maps,
625 int frame_size
626 );
627 };
628
629 //----------------------------------------------------------------------------------------------------
630
631 class UpcallLinker;
632
633 // A (Panama) upcall stub. Not used by JNI.
634 class UpcallStub: public RuntimeBlob {
635 friend class UpcallLinker;
636 private:
637 jobject _receiver;
638 ByteSize _frame_data_offset;
639
640 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
641
642 void* operator new(size_t s, unsigned size) throw();
643
644 struct FrameData {
645 JavaFrameAnchor jfa;
646 JavaThread* thread;
647 JNIHandleBlock* old_handles;
648 JNIHandleBlock* new_handles;
649 };
650
651 // defined in frame_ARCH.cpp
652 FrameData* frame_data_for_frame(const frame& frame) const;
653 public:
654 // Creation
655 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
656
657 static void free(UpcallStub* blob);
658
659 jobject receiver() { return _receiver; }
660
661 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
662
663 // GC/Verification support
664 void oops_do(OopClosure* f, const frame& frame);
665 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) override;
666 void verify() override;
667
668 // Misc.
669 void print_on(outputStream* st) const override;
670 void print_value_on(outputStream* st) const override;
671 };
672
673 #endif // SHARE_CODE_CODEBLOB_HPP