1 /*
2 * Copyright (c) 1998, 2023, 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 // CompiledMethod : Compiled Java methods (include method that calls to native code)
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 // 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
79 class CodeBlobLayout;
80 class UpcallStub; // for as_upcall_stub()
81 class RuntimeStub; // for as_runtime_stub()
82 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame
83
84 class CodeBlob {
85 friend class VMStructs;
86 friend class JVMCIVMStructs;
87 friend class CodeCacheDumper;
88
89 protected:
90
91 // order fields from large to small to minimize padding between fields
92 address _code_begin;
93 address _code_end;
94 address _content_begin; // address to where content region begins (this includes consts, insts, stubs)
95 // address _content_end - not required, for all CodeBlobs _code_end == _content_end for now
96 address _data_end;
97 address _relocation_begin;
98 address _relocation_end;
99
100 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
101
102 const char* _name;
103 S390_ONLY(int _ctable_offset;)
104
105 int _size; // total size of CodeBlob in bytes
106 int _header_size; // size of header (depends on subclass)
107 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
108 // not finished setting up their frame. Beware of pc's in
109 // that range. There is a similar range(s) on returns
110 // which we don't detect.
111 int _data_offset; // offset to where data region begins
112 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words)
113
114 bool _caller_must_gc_arguments;
115
116 bool _is_compiled;
117 const CompilerType _type; // CompilerType
118
119 #ifndef PRODUCT
120 AsmRemarks _asm_remarks;
121 DbgStrings _dbg_strings;
122 #endif // not PRODUCT
123
124 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset,
125 int frame_size, ImmutableOopMapSet* oop_maps,
126 bool caller_must_gc_arguments, bool compiled = false);
127 CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, CodeBuffer* cb, int frame_complete_offset,
128 int frame_size, OopMapSet* oop_maps,
129 bool caller_must_gc_arguments, bool compiled = false);
130
131 void operator delete(void* p) { }
132
133 public:
134 // Only used by unit test.
135 CodeBlob() : _type(compiler_none) {}
136
137 virtual ~CodeBlob() {
138 assert(_oop_maps == nullptr, "Not flushed");
139 }
140
141 // Returns the space needed for CodeBlob
142 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
143 static unsigned int align_code_offset(int offset);
144
145 // Deletion
146 virtual void purge(bool free_code_cache_data = true);
147
148 // Typing
149 virtual bool is_buffer_blob() const { return false; }
150 virtual bool is_nmethod() const { return false; }
151 virtual bool is_runtime_stub() const { return false; }
152 virtual bool is_deoptimization_stub() const { return false; }
153 virtual bool is_uncommon_trap_stub() const { return false; }
154 virtual bool is_exception_stub() const { return false; }
155 virtual bool is_safepoint_stub() const { return false; }
156 virtual bool is_adapter_blob() const { return false; }
157 virtual bool is_vtable_blob() const { return false; }
158 virtual bool is_method_handles_adapter_blob() const { return false; }
159 virtual bool is_upcall_stub() const { return false; }
160 bool is_compiled() const { return _is_compiled; }
161 const bool* is_compiled_addr() const { return &_is_compiled; }
162
163 inline bool is_compiled_by_c1() const { return _type == compiler_c1; };
164 inline bool is_compiled_by_c2() const { return _type == compiler_c2; };
165 inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; };
166 const char* compiler_name() const;
167 CompilerType compiler_type() const { return _type; }
168
169 // Casting
170 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : nullptr; }
171 nmethod* as_nmethod() { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
172 CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : nullptr; }
173 CompiledMethod* as_compiled_method() { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; }
174 CodeBlob* as_codeblob_or_null() const { return (CodeBlob*) this; }
175 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; }
176 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; }
177
178 // Boundaries
179 address header_begin() const { return (address) this; }
180 relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; };
181 relocInfo* relocation_end() const { return (relocInfo*) _relocation_end; }
182 address content_begin() const { return _content_begin; }
183 address content_end() const { return _code_end; } // _code_end == _content_end is true for all types of blobs for now, it is also checked in the constructor
184 address code_begin() const { return _code_begin; }
185 address code_end() const { return _code_end; }
186 address data_end() const { return _data_end; }
187
188 // This field holds the beginning of the const section in the old code buffer.
189 // It is needed to fix relocations of pc-relative loads when resizing the
190 // the constant pool or moving it.
191 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
192 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
193
194 // Sizes
195 int size() const { return _size; }
196 int header_size() const { return _header_size; }
197 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); }
198 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); }
199 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); }
200 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed
201 void adjust_size(size_t used) {
202 _size = (int)used;
203 _data_offset = (int)used;
204 _code_end = (address)this + used;
205 _data_end = (address)this + used;
206 }
207
208 // Containment
209 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
210 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
211 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
212 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
213 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
214 int frame_complete_offset() const { return _frame_complete_offset; }
215
216 virtual bool is_not_entrant() const { return false; }
217
218 // OopMap for frame
219 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
220 void set_oop_maps(OopMapSet* p);
221
222 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const;
223 const ImmutableOopMap* oop_map_for_return_address(address return_address) const;
224 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
225
226 // Frame support. Sizes are in word units.
227 int frame_size() const { return _frame_size; }
228 void set_frame_size(int size) { _frame_size = size; }
229
230 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
231 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
232
233 // Naming
234 const char* name() const { return _name; }
235 void set_name(const char* name) { _name = name; }
236
237 // Debugging
238 virtual void verify() = 0;
239 virtual void print() const;
240 virtual void print_on(outputStream* st) const;
241 virtual void print_value_on(outputStream* st) const;
242 void dump_for_addr(address addr, outputStream* st, bool verbose) const;
243 void print_code();
244
245 // Print to stream, any comments associated with offset.
246 virtual void print_block_comment(outputStream* stream, address block_begin) const {
247 #ifndef PRODUCT
248 ptrdiff_t offset = block_begin - code_begin();
249 assert(offset >= 0, "Expecting non-negative offset!");
250 _asm_remarks.print(uint(offset), stream);
251 #endif
252 }
253
254 #ifndef PRODUCT
255 AsmRemarks &asm_remarks() { return _asm_remarks; }
256 DbgStrings &dbg_strings() { return _dbg_strings; }
257
258 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); }
259 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); }
260 #endif
261 };
262
263 class CodeBlobLayout : public StackObj {
264 private:
265 int _size;
266 int _header_size;
267 int _relocation_size;
268 int _content_offset;
269 int _code_offset;
270 int _data_offset;
271 address _code_begin;
272 address _code_end;
273 address _content_begin;
274 address _content_end;
275 address _data_end;
276 address _relocation_begin;
277 address _relocation_end;
278
279 public:
280 CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
281 _size(0),
282 _header_size(0),
283 _relocation_size(0),
284 _content_offset(0),
285 _code_offset(0),
286 _data_offset(0),
287 _code_begin(code_begin),
288 _code_end(code_end),
289 _content_begin(content_begin),
290 _content_end(content_end),
291 _data_end(data_end),
292 _relocation_begin(relocation_begin),
293 _relocation_end(relocation_end)
294 {
295 }
296
297 CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
298 _size(size),
299 _header_size(header_size),
300 _relocation_size(relocation_size),
301 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
302 _code_offset(_content_offset),
303 _data_offset(data_offset)
304 {
305 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
306
307 _code_begin = (address) start + _code_offset;
308 _code_end = (address) start + _data_offset;
309
310 _content_begin = (address) start + _content_offset;
311 _content_end = (address) start + _data_offset;
312
313 _data_end = (address) start + _size;
314 _relocation_begin = (address) start + _header_size;
315 _relocation_end = _relocation_begin + _relocation_size;
316 }
317
318 CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
319 _size(size),
320 _header_size(header_size),
321 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
322 _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
323 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
324 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize))
325 {
326 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
327
328 _code_begin = (address) start + _code_offset;
329 _code_end = (address) start + _data_offset;
330
331 _content_begin = (address) start + _content_offset;
332 _content_end = (address) start + _data_offset;
333
334 _data_end = (address) start + _size;
335 _relocation_begin = (address) start + _header_size;
336 _relocation_end = _relocation_begin + _relocation_size;
337 }
338
339 int size() const { return _size; }
340 int header_size() const { return _header_size; }
341 int relocation_size() const { return _relocation_size; }
342 int content_offset() const { return _content_offset; }
343 int code_offset() const { return _code_offset; }
344 int data_offset() const { return _data_offset; }
345 address code_begin() const { return _code_begin; }
346 address code_end() const { return _code_end; }
347 address data_end() const { return _data_end; }
348 address relocation_begin() const { return _relocation_begin; }
349 address relocation_end() const { return _relocation_end; }
350 address content_begin() const { return _content_begin; }
351 address content_end() const { return _content_end; }
352 };
353
354
355 class RuntimeBlob : public CodeBlob {
356 friend class VMStructs;
357 public:
358
359 // Creation
360 // a) simple CodeBlob
361 // frame_complete is the offset from the beginning of the instructions
362 // to where the frame setup (from stackwalk viewpoint) is complete.
363 RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
364
365 // b) full CodeBlob
366 RuntimeBlob(
367 const char* name,
368 CodeBuffer* cb,
369 int header_size,
370 int size,
371 int frame_complete,
372 int frame_size,
373 OopMapSet* oop_maps,
374 bool caller_must_gc_arguments = false
375 );
376
377 static void free(RuntimeBlob* blob);
378
379 void verify();
380
381 // OopMap for frame
382 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
383
384 // Debugging
385 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
386 virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
387
388 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
389 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
390 };
391
392 class WhiteBox;
393 //----------------------------------------------------------------------------------------------------
394 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
395
396 class BufferBlob: public RuntimeBlob {
397 friend class VMStructs;
398 friend class AdapterBlob;
399 friend class VtableBlob;
400 friend class MethodHandlesAdapterBlob;
401 friend class UpcallStub;
402 friend class WhiteBox;
403
404 private:
405 // Creation support
406 BufferBlob(const char* name, int size);
407 BufferBlob(const char* name, int size, CodeBuffer* cb);
408
409 void* operator new(size_t s, unsigned size) throw();
410
411 public:
412 // Creation
413 static BufferBlob* create(const char* name, uint buffer_size);
414 static BufferBlob* create(const char* name, CodeBuffer* cb);
415
416 static void free(BufferBlob* buf);
417
418 // Typing
419 virtual bool is_buffer_blob() const { return true; }
420
421 // GC/Verification support
422 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
423
424 void verify();
425 void print_on(outputStream* st) const;
426 void print_value_on(outputStream* st) const;
427 };
428
429
430 //----------------------------------------------------------------------------------------------------
431 // AdapterBlob: used to hold C2I/I2C adapters
432
433 class AdapterBlob: public BufferBlob {
434 private:
435 AdapterBlob(int size, CodeBuffer* cb);
436
437 public:
438 // Creation
439 static AdapterBlob* create(CodeBuffer* cb);
440
441 // Typing
442 virtual bool is_adapter_blob() const { return true; }
443 };
444
445 //---------------------------------------------------------------------------------------------------
446 class VtableBlob: public BufferBlob {
447 private:
448 VtableBlob(const char*, int);
449
450 void* operator new(size_t s, unsigned size) throw();
451
452 public:
453 // Creation
454 static VtableBlob* create(const char* name, int buffer_size);
455
456 // Typing
457 virtual bool is_vtable_blob() const { return true; }
458 };
459
460 //----------------------------------------------------------------------------------------------------
461 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
462
463 class MethodHandlesAdapterBlob: public BufferBlob {
464 private:
465 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", size) {}
466
467 public:
468 // Creation
469 static MethodHandlesAdapterBlob* create(int buffer_size);
470
471 // Typing
472 virtual bool is_method_handles_adapter_blob() const { return true; }
473 };
474
475
476 //----------------------------------------------------------------------------------------------------
477 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
478
479 class RuntimeStub: public RuntimeBlob {
480 friend class VMStructs;
481 private:
482 // Creation support
483 RuntimeStub(
484 const char* name,
485 CodeBuffer* cb,
486 int size,
487 int frame_complete,
488 int frame_size,
489 OopMapSet* oop_maps,
490 bool caller_must_gc_arguments
491 );
492
493 void* operator new(size_t s, unsigned size) throw();
494
495 public:
496 // Creation
497 static RuntimeStub* new_runtime_stub(
498 const char* stub_name,
499 CodeBuffer* cb,
500 int frame_complete,
501 int frame_size,
502 OopMapSet* oop_maps,
503 bool caller_must_gc_arguments,
504 bool alloc_fail_is_fatal=true
505 );
506
507 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); }
508
509 // Typing
510 bool is_runtime_stub() const { return true; }
511
512 address entry_point() const { return code_begin(); }
513
514 // GC/Verification support
515 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
516
517 void verify();
518 void print_on(outputStream* st) const;
519 void print_value_on(outputStream* st) const;
520 };
521
522
523 //----------------------------------------------------------------------------------------------------
524 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
525
526 class SingletonBlob: public RuntimeBlob {
527 friend class VMStructs;
528
529 protected:
530 void* operator new(size_t s, unsigned size) throw();
531
532 public:
533 SingletonBlob(
534 const char* name,
535 CodeBuffer* cb,
536 int header_size,
537 int size,
538 int frame_size,
539 OopMapSet* oop_maps
540 )
541 : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
542 {};
543
544 address entry_point() { return code_begin(); }
545
546 // GC/Verification support
547 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
548 void verify(); // does nothing
549 void print_on(outputStream* st) const;
550 void print_value_on(outputStream* st) const;
551 };
552
553
554 //----------------------------------------------------------------------------------------------------
555 // DeoptimizationBlob
556
557 class DeoptimizationBlob: public SingletonBlob {
558 friend class VMStructs;
559 friend class JVMCIVMStructs;
560 private:
561 int _unpack_offset;
562 int _unpack_with_exception;
563 int _unpack_with_reexecution;
564
565 int _unpack_with_exception_in_tls;
566
567 #if INCLUDE_JVMCI
568 // Offsets when JVMCI calls uncommon_trap.
569 int _uncommon_trap_offset;
570 int _implicit_exception_uncommon_trap_offset;
571 #endif
572
573 // Creation support
574 DeoptimizationBlob(
575 CodeBuffer* cb,
576 int size,
577 OopMapSet* oop_maps,
578 int unpack_offset,
579 int unpack_with_exception_offset,
580 int unpack_with_reexecution_offset,
581 int frame_size
582 );
583
584 public:
585 // Creation
586 static DeoptimizationBlob* create(
587 CodeBuffer* cb,
588 OopMapSet* oop_maps,
589 int unpack_offset,
590 int unpack_with_exception_offset,
591 int unpack_with_reexecution_offset,
592 int frame_size
593 );
594
595 // Typing
596 bool is_deoptimization_stub() const { return true; }
597
598 // GC for args
599 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
600
601 // Printing
602 void print_value_on(outputStream* st) const;
603
604 address unpack() const { return code_begin() + _unpack_offset; }
605 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
606 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
607
608 // Alternate entry point for C1 where the exception and issuing pc
609 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
610 // instead of being in registers. This is needed because C1 doesn't
611 // model exception paths in a way that keeps these registers free so
612 // there may be live values in those registers during deopt.
613 void set_unpack_with_exception_in_tls_offset(int offset) {
614 _unpack_with_exception_in_tls = offset;
615 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
616 }
617 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
618
619 #if INCLUDE_JVMCI
620 // Offsets when JVMCI calls uncommon_trap.
621 void set_uncommon_trap_offset(int offset) {
622 _uncommon_trap_offset = offset;
623 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
624 }
625 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
626
627 void set_implicit_exception_uncommon_trap_offset(int offset) {
628 _implicit_exception_uncommon_trap_offset = offset;
629 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
630 }
631 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
632 #endif // INCLUDE_JVMCI
633 };
634
635
636 //----------------------------------------------------------------------------------------------------
637 // UncommonTrapBlob (currently only used by Compiler 2)
638
639 #ifdef COMPILER2
640
641 class UncommonTrapBlob: public SingletonBlob {
642 friend class VMStructs;
643 private:
644 // Creation support
645 UncommonTrapBlob(
646 CodeBuffer* cb,
647 int size,
648 OopMapSet* oop_maps,
649 int frame_size
650 );
651
652 public:
653 // Creation
654 static UncommonTrapBlob* create(
655 CodeBuffer* cb,
656 OopMapSet* oop_maps,
657 int frame_size
658 );
659
660 // GC for args
661 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
662
663 // Typing
664 bool is_uncommon_trap_stub() const { return true; }
665 };
666
667
668 //----------------------------------------------------------------------------------------------------
669 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
670
671 class ExceptionBlob: public SingletonBlob {
672 friend class VMStructs;
673 private:
674 // Creation support
675 ExceptionBlob(
676 CodeBuffer* cb,
677 int size,
678 OopMapSet* oop_maps,
679 int frame_size
680 );
681
682 public:
683 // Creation
684 static ExceptionBlob* create(
685 CodeBuffer* cb,
686 OopMapSet* oop_maps,
687 int frame_size
688 );
689
690 // GC for args
691 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
692
693 // Typing
694 bool is_exception_stub() const { return true; }
695 };
696 #endif // COMPILER2
697
698
699 //----------------------------------------------------------------------------------------------------
700 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
701
702 class SafepointBlob: public SingletonBlob {
703 friend class VMStructs;
704 private:
705 // Creation support
706 SafepointBlob(
707 CodeBuffer* cb,
708 int size,
709 OopMapSet* oop_maps,
710 int frame_size
711 );
712
713 public:
714 // Creation
715 static SafepointBlob* create(
716 CodeBuffer* cb,
717 OopMapSet* oop_maps,
718 int frame_size
719 );
720
721 // GC for args
722 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
723
724 // Typing
725 bool is_safepoint_stub() const { return true; }
726 };
727
728 //----------------------------------------------------------------------------------------------------
729
730 class UpcallLinker;
731
732 // A (Panama) upcall stub. Not used by JNI.
733 class UpcallStub: public RuntimeBlob {
734 friend class UpcallLinker;
735 private:
736 jobject _receiver;
737 ByteSize _frame_data_offset;
738
739 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset);
740
741 void* operator new(size_t s, unsigned size) throw();
742
743 struct FrameData {
744 JavaFrameAnchor jfa;
745 JavaThread* thread;
746 JNIHandleBlock* old_handles;
747 JNIHandleBlock* new_handles;
748 };
749
750 // defined in frame_ARCH.cpp
751 FrameData* frame_data_for_frame(const frame& frame) const;
752 public:
753 // Creation
754 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset);
755
756 static void free(UpcallStub* blob);
757
758 jobject receiver() { return _receiver; }
759
760 JavaFrameAnchor* jfa_for_frame(const frame& frame) const;
761
762 // Typing
763 virtual bool is_upcall_stub() const override { return true; }
764
765 // GC/Verification support
766 void oops_do(OopClosure* f, const frame& frame);
767 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) override;
768 virtual void verify() override;
769
770 // Misc.
771 virtual void print_on(outputStream* st) const override;
772 virtual void print_value_on(outputStream* st) const override;
773 };
774
775 #endif // SHARE_CODE_CODEBLOB_HPP