jdk

Форк
0
/
frame_arm.cpp 
558 строк · 18.5 Кб
1
/*
2
 * Copyright (c) 2008, 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
#include "precompiled.hpp"
26
#include "compiler/oopMap.hpp"
27
#include "interpreter/interpreter.hpp"
28
#include "memory/resourceArea.hpp"
29
#include "memory/universe.hpp"
30
#include "oops/markWord.hpp"
31
#include "oops/method.hpp"
32
#include "oops/oop.inline.hpp"
33
#include "prims/methodHandles.hpp"
34
#include "runtime/frame.inline.hpp"
35
#include "runtime/handles.inline.hpp"
36
#include "runtime/javaCalls.hpp"
37
#include "runtime/monitorChunk.hpp"
38
#include "runtime/os.inline.hpp"
39
#include "runtime/signature.hpp"
40
#include "runtime/stubCodeGenerator.hpp"
41
#include "runtime/stubRoutines.hpp"
42
#include "vmreg_arm.inline.hpp"
43
#ifdef COMPILER1
44
#include "c1/c1_Runtime1.hpp"
45
#include "runtime/vframeArray.hpp"
46
#endif
47

48
#ifdef ASSERT
49
void RegisterMap::check_location_valid() {
50
}
51
#endif
52

53

54
// Profiling/safepoint support
55

56
bool frame::safe_for_sender(JavaThread *thread) {
57
  address   sp = (address)_sp;
58
  address   fp = (address)_fp;
59
  address   unextended_sp = (address)_unextended_sp;
60

61
  // consider stack guards when trying to determine "safe" stack pointers
62
  // sp must be within the usable part of the stack (not in guards)
63
  if (!thread->is_in_usable_stack(sp)) {
64
    return false;
65
  }
66

67
  if (!thread->is_in_stack_range_incl(unextended_sp, sp)) {
68
    return false;
69
  }
70

71
  // We know sp/unextended_sp are safe. Only fp is questionable here.
72

73
  bool fp_safe = thread->is_in_stack_range_incl(fp, sp);
74

75
  if (_cb != nullptr ) {
76

77
    // First check if frame is complete and tester is reliable
78
    // Unfortunately we can only check frame complete for runtime stubs and nmethod
79
    // other generic buffer blobs are more problematic so we just assume they are
80
    // ok. adapter blobs never have a frame complete and are never ok.
81

82
    if (!_cb->is_frame_complete_at(_pc)) {
83
      if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
84
        return false;
85
      }
86
    }
87

88
    // Could just be some random pointer within the codeBlob
89
    if (!_cb->code_contains(_pc)) {
90
      return false;
91
    }
92

93
    // Entry frame checks
94
    if (is_entry_frame()) {
95
      // an entry frame must have a valid fp.
96
      return fp_safe && is_entry_frame_valid(thread);
97
    }
98

99
    intptr_t* sender_sp = nullptr;
100
    address   sender_pc = nullptr;
101

102
    if (is_interpreted_frame()) {
103
      // fp must be safe
104
      if (!fp_safe) {
105
        return false;
106
      }
107

108
      sender_pc = (address) this->fp()[return_addr_offset];
109
      sender_sp = (intptr_t*) addr_at(sender_sp_offset);
110

111
    } else {
112
      // must be some sort of compiled/runtime frame
113
      // fp does not have to be safe (although it could be check for c1?)
114

115
      sender_sp = _unextended_sp + _cb->frame_size();
116
      // Is sender_sp safe?
117
      if (!thread->is_in_full_stack_checked((address)sender_sp)) {
118
        return false;
119
      }
120
      // With our calling conventions, the return_address should
121
      // end up being the word on the stack
122
      sender_pc = (address) *(sender_sp - sender_sp_offset + return_addr_offset);
123
    }
124

125
    // We must always be able to find a recognizable pc
126
    CodeBlob* sender_blob = CodeCache::find_blob(sender_pc);
127
    if (sender_pc == nullptr || sender_blob == nullptr) {
128
      return false;
129
    }
130

131

132
    // If the potential sender is the interpreter then we can do some more checking
133
    if (Interpreter::contains(sender_pc)) {
134

135
      // FP is always saved in a recognizable place in any code we generate. However
136
      // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved FP
137
      // is really a frame pointer.
138

139
      intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset + link_offset);
140
      if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
141
        return false;
142
      }
143

144
      // construct the potential sender
145

146
      frame sender(sender_sp, saved_fp, sender_pc);
147

148
      return sender.is_interpreted_frame_valid(thread);
149
    }
150

151
    // Could just be some random pointer within the codeBlob
152
    if (!sender_blob->code_contains(sender_pc)) {
153
      return false;
154
    }
155

156
    // We should never be able to see an adapter if the current frame is something from code cache
157
    if (sender_blob->is_adapter_blob()) {
158
      return false;
159
    }
160

161
    // Could be the call_stub
162
    if (StubRoutines::returns_to_call_stub(sender_pc)) {
163
      intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset + link_offset);
164
      if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
165
        return false;
166
      }
167

168
      // construct the potential sender
169

170
      frame sender(sender_sp, saved_fp, sender_pc);
171

172
      // Validate the JavaCallWrapper an entry frame must have
173
      address jcw = (address)sender.entry_frame_call_wrapper();
174

175
      return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
176
    }
177

178
    // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
179
    // because the return address counts against the callee's frame.
180

181
    if (sender_blob->frame_size() <= 0) {
182
      assert(!sender_blob->is_nmethod(), "should count return address at least");
183
      return false;
184
    }
185

186
    // We should never be able to see anything here except an nmethod. If something in the
187
    // code cache (current frame) is called by an entity within the code cache that entity
188
    // should not be anything but the call stub (already covered), the interpreter (already covered)
189
    // or an nmethod.
190

191
    if (!sender_blob->is_nmethod()) {
192
      return false;
193
    }
194

195
    // Could put some more validation for the potential non-interpreted sender
196
    // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
197

198
    // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
199

200
    // We've validated the potential sender that would be created
201
    return true;
202
  }
203

204
  // Must be native-compiled frame. Since sender will try and use fp to find
205
  // linkages it must be safe
206

207
  if (!fp_safe) {
208
    return false;
209
  }
210

211
  // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
212

213
  if ((address) this->fp()[return_addr_offset] == nullptr) return false;
214

215

216
  // could try and do some more potential verification of native frame if we could think of some...
217

218
  return true;
219
}
220

221

222
void frame::patch_pc(Thread* thread, address pc) {
223
  assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
224
  address* pc_addr = &((address *)sp())[-sender_sp_offset+return_addr_offset];
225
  if (TracePcPatching) {
226
    tty->print_cr("patch_pc at address" INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "] ",
227
                  p2i(pc_addr), p2i(*pc_addr), p2i(pc));
228
  }
229
  DEBUG_ONLY(address old_pc = _pc;)
230
  *pc_addr = pc;
231
  _pc = pc; // must be set before call to get_deopt_original_pc
232
  address original_pc = get_deopt_original_pc();
233
  if (original_pc != nullptr) {
234
    assert(original_pc == old_pc, "expected original PC to be stored before patching");
235
    _deopt_state = is_deoptimized;
236
    // leave _pc as is
237
  } else {
238
    _deopt_state = not_deoptimized;
239
    _pc = pc;
240
  }
241
}
242

243
bool frame::is_interpreted_frame() const  {
244
  return Interpreter::contains(pc());
245
}
246

247
intptr_t* frame::entry_frame_argument_at(int offset) const {
248
  assert(is_entry_frame(), "entry frame expected");
249
  // convert offset to index to deal with tsi
250
  int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
251
  // Entry frame's arguments are always in relation to unextended_sp()
252
  return &unextended_sp()[index];
253
}
254

255
// locals
256

257
void frame::interpreter_frame_set_locals(intptr_t* locs)  {
258
  assert(is_interpreted_frame(), "interpreted frame expected");
259
  // set relativized locals
260
  ptr_at_put(interpreter_frame_locals_offset, (intptr_t) (locs - fp()));
261
}
262

263
// sender_sp
264

265
intptr_t* frame::interpreter_frame_sender_sp() const {
266
  assert(is_interpreted_frame(), "interpreted frame expected");
267
  return (intptr_t*) at(interpreter_frame_sender_sp_offset);
268
}
269

270
void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
271
  assert(is_interpreted_frame(), "interpreted frame expected");
272
  ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
273
}
274

275

276
// monitor elements
277

278
BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
279
  return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
280
}
281

282
BasicObjectLock* frame::interpreter_frame_monitor_end() const {
283
  BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
284
  // make sure the pointer points inside the frame
285
  assert((intptr_t) fp() >  (intptr_t) result, "result must <  than frame pointer");
286
  assert((intptr_t) sp() <= (intptr_t) result, "result must >= than stack pointer");
287
  return result;
288
}
289

290
void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
291
  *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
292
}
293

294

295
// Used by template based interpreter deoptimization
296
void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
297
    *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
298
}
299

300

301
frame frame::sender_for_entry_frame(RegisterMap* map) const {
302
  assert(map != nullptr, "map must be set");
303
  // Java frame called from C; skip all C frames and return top C
304
  // frame of that chunk as the sender
305
  JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
306
  assert(!entry_frame_is_first(), "next Java fp must be non zero");
307
  assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
308
  map->clear();
309
  assert(map->include_argument_oops(), "should be set by clear");
310
  if (jfa->last_Java_pc() != nullptr) {
311
    frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
312
    return fr;
313
  }
314
  frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
315
  return fr;
316
}
317

318
UpcallStub::FrameData* UpcallStub::frame_data_for_frame(const frame& frame) const {
319
  ShouldNotCallThis();
320
  return nullptr;
321
}
322

323
bool frame::upcall_stub_frame_is_first() const {
324
  ShouldNotCallThis();
325
  return false;
326
}
327

328
//------------------------------------------------------------------------------
329
// frame::verify_deopt_original_pc
330
//
331
// Verifies the calculated original PC of a deoptimization PC for the
332
// given unextended SP.  The unextended SP might also be the saved SP
333
// for MethodHandle call sites.
334
#ifdef ASSERT
335
void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp, bool is_method_handle_return) {
336
  frame fr;
337

338
  // This is ugly but it's better than to change {get,set}_original_pc
339
  // to take an SP value as argument.  And it's only a debugging
340
  // method anyway.
341
  fr._unextended_sp = unextended_sp;
342

343
  address original_pc = nm->get_original_pc(&fr);
344
  assert(nm->insts_contains_inclusive(original_pc),
345
         "original PC must be in the main code section of the compiled method (or must be immediately following it)");
346
  assert(nm->is_method_handle_return(original_pc) == is_method_handle_return, "must be");
347
}
348
#endif
349

350
//------------------------------------------------------------------------------
351
// frame::adjust_unextended_sp
352
void frame::adjust_unextended_sp() {
353
  // same as on x86
354

355
  // If we are returning to a compiled MethodHandle call site, the
356
  // saved_fp will in fact be a saved value of the unextended SP.  The
357
  // simplest way to tell whether we are returning to such a call site
358
  // is as follows:
359

360
  nmethod* sender_nm = (_cb == nullptr) ? nullptr : _cb->as_nmethod_or_null();
361
  if (sender_nm != nullptr) {
362
    // If the sender PC is a deoptimization point, get the original
363
    // PC.  For MethodHandle call site the unextended_sp is stored in
364
    // saved_fp.
365
    if (sender_nm->is_deopt_mh_entry(_pc)) {
366
      DEBUG_ONLY(verify_deopt_mh_original_pc(sender_nm, _fp));
367
      _unextended_sp = _fp;
368
    }
369
    else if (sender_nm->is_deopt_entry(_pc)) {
370
      DEBUG_ONLY(verify_deopt_original_pc(sender_nm, _unextended_sp));
371
    }
372
    else if (sender_nm->is_method_handle_return(_pc)) {
373
      _unextended_sp = _fp;
374
    }
375
  }
376
}
377

378
//------------------------------------------------------------------------------
379
// frame::update_map_with_saved_link
380
void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
381
  // see x86 for comments
382
  map->set_location(FP->as_VMReg(), (address) link_addr);
383
}
384

385
frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
386
  // SP is the raw SP from the sender after adapter or interpreter
387
  // extension.
388
  intptr_t* sender_sp = this->sender_sp();
389

390
  // This is the sp before any possible extension (adapter/locals).
391
  intptr_t* unextended_sp = interpreter_frame_sender_sp();
392

393
#ifdef COMPILER2
394
  if (map->update_map()) {
395
    update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
396
  }
397
#endif // COMPILER2
398

399
  return frame(sender_sp, unextended_sp, link(), sender_pc());
400
}
401

402
bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
403
  assert(is_interpreted_frame(), "Not an interpreted frame");
404
  // These are reasonable sanity checks
405
  if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
406
    return false;
407
  }
408
  if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
409
    return false;
410
  }
411
  if (fp() + interpreter_frame_initial_sp_offset < sp()) {
412
    return false;
413
  }
414
  // These are hacks to keep us out of trouble.
415
  // The problem with these is that they mask other problems
416
  if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
417
    return false;
418
  }
419
  // do some validation of frame elements
420

421
  // first the method
422

423
  Method* m = safe_interpreter_frame_method();
424

425
  // validate the method we'd find in this potential sender
426
  if (!Method::is_valid_method(m)) return false;
427

428
  // stack frames shouldn't be much larger than max_stack elements
429

430
  if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
431
    return false;
432
  }
433

434
  // validate bci/bcp
435

436
  address bcp = interpreter_frame_bcp();
437
  if (m->validate_bci_from_bcp(bcp) < 0) {
438
    return false;
439
  }
440

441
  // validate ConstantPoolCache*
442
  ConstantPoolCache* cp = *interpreter_frame_cache_addr();
443
  if (MetaspaceObj::is_valid(cp) == false) return false;
444

445
  // validate locals
446

447
  address locals =  (address)interpreter_frame_locals();
448
  return thread->is_in_stack_range_incl(locals, (address)fp());
449
}
450

451
BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
452
  assert(is_interpreted_frame(), "interpreted frame expected");
453
  Method* method = interpreter_frame_method();
454
  BasicType type = method->result_type();
455

456
  intptr_t* res_addr;
457
  if (method->is_native()) {
458
    // Prior to calling into the runtime to report the method_exit both of
459
    // the possible return value registers are saved.
460
    // Return value registers are pushed to the native stack
461
    res_addr = (intptr_t*)sp();
462
#ifdef __ABI_HARD__
463
    // FP result is pushed onto a stack along with integer result registers
464
    if (type == T_FLOAT || type == T_DOUBLE) {
465
      res_addr += 2;
466
    }
467
#endif // __ABI_HARD__
468
  } else {
469
    res_addr = (intptr_t*)interpreter_frame_tos_address();
470
  }
471

472
  switch (type) {
473
    case T_OBJECT  :
474
    case T_ARRAY   : {
475
      oop obj;
476
      if (method->is_native()) {
477
        obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
478
      } else {
479
        obj = *(oop*)res_addr;
480
      }
481
      assert(Universe::is_in_heap_or_null(obj), "sanity check");
482
      *oop_result = obj;
483
      break;
484
    }
485
    case T_BOOLEAN : value_result->z = *(jboolean*)res_addr; break;
486
    case T_BYTE    : value_result->b = *(jbyte*)res_addr; break;
487
    case T_CHAR    : value_result->c = *(jchar*)res_addr; break;
488
    case T_SHORT   : value_result->s = *(jshort*)res_addr; break;
489
    case T_INT     : value_result->i = *(jint*)res_addr; break;
490
    case T_LONG    : value_result->j = *(jlong*)res_addr; break;
491
    case T_FLOAT   : value_result->f = *(jfloat*)res_addr; break;
492
    case T_DOUBLE  : value_result->d = *(jdouble*)res_addr; break;
493
    case T_VOID    : /* Nothing to do */ break;
494
    default        : ShouldNotReachHere();
495
  }
496

497
  return type;
498
}
499

500
intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
501
  int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
502
  return &interpreter_frame_tos_address()[index];
503
}
504

505
#ifndef PRODUCT
506

507
#define DESCRIBE_FP_OFFSET(name) \
508
  values.describe(frame_no, fp() + frame::name##_offset, #name)
509

510
void frame::describe_pd(FrameValues& values, int frame_no) {
511
  if (is_interpreted_frame()) {
512
    DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
513
    DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
514
    DESCRIBE_FP_OFFSET(interpreter_frame_method);
515
    DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
516
    DESCRIBE_FP_OFFSET(interpreter_frame_cache);
517
    DESCRIBE_FP_OFFSET(interpreter_frame_locals);
518
    DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
519
    DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
520
  }
521
}
522

523
// This is a generic constructor which is only used by pns() in debug.cpp.
524
frame::frame(void* sp, void* fp, void* pc) {
525
  init((intptr_t*)sp, (intptr_t*)sp, (intptr_t*)fp, (address)pc);
526
}
527

528
#endif
529

530
intptr_t *frame::initial_deoptimization_info() {
531
  // used to reset the saved FP
532
  return fp();
533
}
534

535
intptr_t* frame::real_fp() const {
536
  if (is_entry_frame()) {
537
    // Work-around: FP (currently) does not conform to the ABI for entry
538
    // frames (see generate_call_stub). Might be worth fixing as another CR.
539
    // Following code assumes (and asserts) this has not yet been fixed.
540
    assert(frame::entry_frame_call_wrapper_offset == 0, "adjust this code");
541
    intptr_t* new_fp = fp();
542
    new_fp += 5; // saved R0,R1,R2,R4,R10
543
#ifndef __SOFTFP__
544
    new_fp += 8*2; // saved D8..D15
545
#endif
546
    return new_fp;
547
  }
548
  if (_cb != nullptr) {
549
    // use the frame size if valid
550
    int size = _cb->frame_size();
551
    if (size > 0) {
552
      return unextended_sp() + size;
553
    }
554
  }
555
  // else rely on fp()
556
  assert(! is_compiled_frame(), "unknown compiled frame size");
557
  return fp();
558
}
559

Использование cookies

Мы используем файлы cookie в соответствии с Политикой конфиденциальности и Политикой использования cookies.

Нажимая кнопку «Принимаю», Вы даете АО «СберТех» согласие на обработку Ваших персональных данных в целях совершенствования нашего веб-сайта и Сервиса GitVerse, а также повышения удобства их использования.

Запретить использование cookies Вы можете самостоятельно в настройках Вашего браузера.