1 /*
2 * Copyright (c) 1997, 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 "classfile/classLoader.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/nmethod.inline.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/abstractCompiler.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "compiler/disassembler.hpp"
39 #include "gc/shared/barrierSet.hpp"
40 #include "gc/shared/collectedHeap.hpp"
41 #include "gc/shared/gcLocker.inline.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/interpreterRuntime.hpp"
44 #include "jvm.h"
45 #include "jfr/jfrEvents.hpp"
46 #include "logging/log.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "metaprogramming/primitiveConversions.hpp"
50 #include "oops/klass.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/forte.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/jvmtiThreadState.hpp"
57 #include "prims/methodHandles.hpp"
58 #include "prims/nativeLookup.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/basicLock.inline.hpp"
62 #include "runtime/frame.inline.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/jniHandles.inline.hpp"
69 #include "runtime/perfData.inline.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/stackWatermarkSet.hpp"
72 #include "runtime/stubRoutines.hpp"
73 #include "runtime/synchronizer.inline.hpp"
74 #include "runtime/timerTrace.hpp"
75 #include "runtime/vframe.inline.hpp"
76 #include "runtime/vframeArray.hpp"
77 #include "runtime/vm_version.hpp"
78 #include "services/management.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/dtrace.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/resourceHash.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/xmlstream.hpp"
86 #ifdef COMPILER1
87 #include "c1/c1_Runtime1.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/jfr.hpp"
91 #endif
92
93 // Shared runtime stub routines reside in their own unique blob with a
94 // single entry point
95
96
97 #define SHARED_STUB_FIELD_DEFINE(name, type) \
98 type SharedRuntime::BLOB_FIELD_NAME(name);
99 SHARED_STUBS_DO(SHARED_STUB_FIELD_DEFINE)
100 #undef SHARED_STUB_FIELD_DEFINE
101
102 nmethod* SharedRuntime::_cont_doYield_stub;
103
104 PerfTickCounters* SharedRuntime::_perf_resolve_opt_virtual_total_time = nullptr;
105 PerfTickCounters* SharedRuntime::_perf_resolve_virtual_total_time = nullptr;
106 PerfTickCounters* SharedRuntime::_perf_resolve_static_total_time = nullptr;
107 PerfTickCounters* SharedRuntime::_perf_handle_wrong_method_total_time = nullptr;
108 PerfTickCounters* SharedRuntime::_perf_ic_miss_total_time = nullptr;
109
110 #define SHARED_STUB_NAME_DECLARE(name, type) "Shared Runtime " # name "_blob",
111 const char *SharedRuntime::_stub_names[] = {
112 SHARED_STUBS_DO(SHARED_STUB_NAME_DECLARE)
113 };
114
115 //----------------------------generate_stubs-----------------------------------
116 void SharedRuntime::generate_initial_stubs() {
117 // Build this early so it's available for the interpreter.
118 _throw_StackOverflowError_blob =
119 generate_throw_exception(SharedStubId::throw_StackOverflowError_id,
120 CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError));
121 }
122
123 void SharedRuntime::generate_stubs() {
124 _wrong_method_blob =
125 generate_resolve_blob(SharedStubId::wrong_method_id,
126 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method));
127 _wrong_method_abstract_blob =
128 generate_resolve_blob(SharedStubId::wrong_method_abstract_id,
129 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract));
130 _ic_miss_blob =
131 generate_resolve_blob(SharedStubId::ic_miss_id,
132 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss));
133 _resolve_opt_virtual_call_blob =
134 generate_resolve_blob(SharedStubId::resolve_opt_virtual_call_id,
135 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C));
136 _resolve_virtual_call_blob =
137 generate_resolve_blob(SharedStubId::resolve_virtual_call_id,
138 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C));
139 _resolve_static_call_blob =
140 generate_resolve_blob(SharedStubId::resolve_static_call_id,
141 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C));
142
143 _throw_delayed_StackOverflowError_blob =
144 generate_throw_exception(SharedStubId::throw_delayed_StackOverflowError_id,
145 CAST_FROM_FN_PTR(address, SharedRuntime::throw_delayed_StackOverflowError));
146
147 _throw_AbstractMethodError_blob =
148 generate_throw_exception(SharedStubId::throw_AbstractMethodError_id,
149 CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError));
150
151 _throw_IncompatibleClassChangeError_blob =
152 generate_throw_exception(SharedStubId::throw_IncompatibleClassChangeError_id,
153 CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError));
154
155 _throw_NullPointerException_at_call_blob =
156 generate_throw_exception(SharedStubId::throw_NullPointerException_at_call_id,
157 CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call));
158
159 AdapterHandlerLibrary::initialize();
160
161 #if COMPILER2_OR_JVMCI
162 // Vectors are generated only by C2 and JVMCI.
163 bool support_wide = is_wide_vector(MaxVectorSize);
164 if (support_wide) {
165 _polling_page_vectors_safepoint_handler_blob =
166 generate_handler_blob(SharedStubId::polling_page_vectors_safepoint_handler_id,
167 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
168 }
169 #endif // COMPILER2_OR_JVMCI
170 _polling_page_safepoint_handler_blob =
171 generate_handler_blob(SharedStubId::polling_page_safepoint_handler_id,
172 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
173 _polling_page_return_handler_blob =
174 generate_handler_blob(SharedStubId::polling_page_return_handler_id,
175 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
176
177 generate_deopt_blob();
178
179 if (UsePerfData) {
180 EXCEPTION_MARK;
181 NEWPERFTICKCOUNTERS(_perf_resolve_opt_virtual_total_time, SUN_CI, "resovle_opt_virtual_call");
182 NEWPERFTICKCOUNTERS(_perf_resolve_virtual_total_time, SUN_CI, "resovle_virtual_call");
183 NEWPERFTICKCOUNTERS(_perf_resolve_static_total_time, SUN_CI, "resovle_static_call");
184 NEWPERFTICKCOUNTERS(_perf_handle_wrong_method_total_time, SUN_CI, "handle_wrong_method");
185 NEWPERFTICKCOUNTERS(_perf_ic_miss_total_time , SUN_CI, "ic_miss");
186 if (HAS_PENDING_EXCEPTION) {
187 vm_exit_during_initialization("SharedRuntime::generate_stubs() failed unexpectedly");
188 }
189 }
190 }
191
192 static void print_counter_on(outputStream* st, const char* name, PerfTickCounters* counter, uint cnt) {
193 st->print(" %-28s " JLONG_FORMAT_W(6) "us", name, counter->elapsed_counter_value_us());
194 if (TraceThreadTime) {
195 st->print(" (elapsed) " JLONG_FORMAT_W(6) "us (thread)", counter->thread_counter_value_us());
196 }
197 st->print(" / %5d events", cnt);
198 st->cr();
199 }
200
201 void SharedRuntime::print_counters_on(outputStream* st) {
202 st->print_cr("SharedRuntime:");
203 if (UsePerfData) {
204 print_counter_on(st, "resolve_opt_virtual_call:", _perf_resolve_opt_virtual_total_time, _resolve_opt_virtual_ctr);
205 print_counter_on(st, "resolve_virtual_call:", _perf_resolve_virtual_total_time, _resolve_virtual_ctr);
206 print_counter_on(st, "resolve_static_call:", _perf_resolve_static_total_time, _resolve_static_ctr);
207 print_counter_on(st, "handle_wrong_method:", _perf_handle_wrong_method_total_time, _wrong_method_ctr);
208 print_counter_on(st, "ic_miss:", _perf_ic_miss_total_time, _ic_miss_ctr);
209
210 jlong total_elapsed_time_us = Management::ticks_to_us(_perf_resolve_opt_virtual_total_time->elapsed_counter_value() +
211 _perf_resolve_virtual_total_time->elapsed_counter_value() +
212 _perf_resolve_static_total_time->elapsed_counter_value() +
213 _perf_handle_wrong_method_total_time->elapsed_counter_value() +
214 _perf_ic_miss_total_time->elapsed_counter_value());
215 st->print("Total: " JLONG_FORMAT_W(5) "us", total_elapsed_time_us);
216 if (TraceThreadTime) {
217 jlong total_thread_time_us = Management::ticks_to_us(_perf_resolve_opt_virtual_total_time->thread_counter_value() +
218 _perf_resolve_virtual_total_time->thread_counter_value() +
219 _perf_resolve_static_total_time->thread_counter_value() +
220 _perf_handle_wrong_method_total_time->thread_counter_value() +
221 _perf_ic_miss_total_time->thread_counter_value());
222 st->print(" (elapsed) " JLONG_FORMAT_W(5) "us (thread)", total_thread_time_us);
223
224 }
225 st->cr();
226 } else {
227 st->print_cr(" no data (UsePerfData is turned off)");
228 }
229 }
230
231 #if INCLUDE_JFR
232 //------------------------------generate jfr runtime stubs ------
233 void SharedRuntime::generate_jfr_stubs() {
234 ResourceMark rm;
235 const char* timer_msg = "SharedRuntime generate_jfr_stubs";
236 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
237
238 _jfr_write_checkpoint_blob = generate_jfr_write_checkpoint();
239 _jfr_return_lease_blob = generate_jfr_return_lease();
240 }
241
242 #endif // INCLUDE_JFR
243
244 #include <math.h>
245
246 // Implementation of SharedRuntime
247
248 // For statistics
249 uint SharedRuntime::_ic_miss_ctr = 0;
250 uint SharedRuntime::_wrong_method_ctr = 0;
251 uint SharedRuntime::_resolve_static_ctr = 0;
252 uint SharedRuntime::_resolve_virtual_ctr = 0;
253 uint SharedRuntime::_resolve_opt_virtual_ctr = 0;
254
255 #ifndef PRODUCT
256 uint SharedRuntime::_implicit_null_throws = 0;
257 uint SharedRuntime::_implicit_div0_throws = 0;
258
259 int64_t SharedRuntime::_nof_normal_calls = 0;
260 int64_t SharedRuntime::_nof_inlined_calls = 0;
261 int64_t SharedRuntime::_nof_megamorphic_calls = 0;
262 int64_t SharedRuntime::_nof_static_calls = 0;
263 int64_t SharedRuntime::_nof_inlined_static_calls = 0;
264 int64_t SharedRuntime::_nof_interface_calls = 0;
265 int64_t SharedRuntime::_nof_inlined_interface_calls = 0;
266
267 uint SharedRuntime::_new_instance_ctr=0;
268 uint SharedRuntime::_new_array_ctr=0;
269 uint SharedRuntime::_multi2_ctr=0;
270 uint SharedRuntime::_multi3_ctr=0;
271 uint SharedRuntime::_multi4_ctr=0;
272 uint SharedRuntime::_multi5_ctr=0;
273 uint SharedRuntime::_mon_enter_stub_ctr=0;
274 uint SharedRuntime::_mon_exit_stub_ctr=0;
275 uint SharedRuntime::_mon_enter_ctr=0;
276 uint SharedRuntime::_mon_exit_ctr=0;
277 uint SharedRuntime::_partial_subtype_ctr=0;
278 uint SharedRuntime::_jbyte_array_copy_ctr=0;
279 uint SharedRuntime::_jshort_array_copy_ctr=0;
280 uint SharedRuntime::_jint_array_copy_ctr=0;
281 uint SharedRuntime::_jlong_array_copy_ctr=0;
282 uint SharedRuntime::_oop_array_copy_ctr=0;
283 uint SharedRuntime::_checkcast_array_copy_ctr=0;
284 uint SharedRuntime::_unsafe_array_copy_ctr=0;
285 uint SharedRuntime::_generic_array_copy_ctr=0;
286 uint SharedRuntime::_slow_array_copy_ctr=0;
287 uint SharedRuntime::_find_handler_ctr=0;
288 uint SharedRuntime::_rethrow_ctr=0;
289 uint SharedRuntime::_unsafe_set_memory_ctr=0;
290
291 int SharedRuntime::_ICmiss_index = 0;
292 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
293 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
294
295
296 void SharedRuntime::trace_ic_miss(address at) {
297 for (int i = 0; i < _ICmiss_index; i++) {
298 if (_ICmiss_at[i] == at) {
299 _ICmiss_count[i]++;
300 return;
301 }
302 }
303 int index = _ICmiss_index++;
304 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
305 _ICmiss_at[index] = at;
306 _ICmiss_count[index] = 1;
307 }
308
309 void SharedRuntime::print_ic_miss_histogram_on(outputStream* st) {
310 if (ICMissHistogram) {
311 st->print_cr("IC Miss Histogram:");
312 int tot_misses = 0;
313 for (int i = 0; i < _ICmiss_index; i++) {
314 st->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
315 tot_misses += _ICmiss_count[i];
316 }
317 st->print_cr("Total IC misses: %7d", tot_misses);
318 }
319 }
320 #endif // !PRODUCT
321
322
323 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
324 return x * y;
325 JRT_END
326
327
328 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
329 if (x == min_jlong && y == CONST64(-1)) {
330 return x;
331 } else {
332 return x / y;
333 }
334 JRT_END
335
336
337 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
338 if (x == min_jlong && y == CONST64(-1)) {
339 return 0;
340 } else {
341 return x % y;
342 }
343 JRT_END
344
345
346 #ifdef _WIN64
347 const juint float_sign_mask = 0x7FFFFFFF;
348 const juint float_infinity = 0x7F800000;
349 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
350 const julong double_infinity = CONST64(0x7FF0000000000000);
351 #endif
352
353 #if !defined(X86)
354 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
355 #ifdef _WIN64
356 // 64-bit Windows on amd64 returns the wrong values for
357 // infinity operands.
358 juint xbits = PrimitiveConversions::cast<juint>(x);
359 juint ybits = PrimitiveConversions::cast<juint>(y);
360 // x Mod Infinity == x unless x is infinity
361 if (((xbits & float_sign_mask) != float_infinity) &&
362 ((ybits & float_sign_mask) == float_infinity) ) {
363 return x;
364 }
365 return ((jfloat)fmod_winx64((double)x, (double)y));
366 #else
367 return ((jfloat)fmod((double)x,(double)y));
368 #endif
369 JRT_END
370
371 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
372 #ifdef _WIN64
373 julong xbits = PrimitiveConversions::cast<julong>(x);
374 julong ybits = PrimitiveConversions::cast<julong>(y);
375 // x Mod Infinity == x unless x is infinity
376 if (((xbits & double_sign_mask) != double_infinity) &&
377 ((ybits & double_sign_mask) == double_infinity) ) {
378 return x;
379 }
380 return ((jdouble)fmod_winx64((double)x, (double)y));
381 #else
382 return ((jdouble)fmod((double)x,(double)y));
383 #endif
384 JRT_END
385 #endif // !X86
386
387 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
388 return (jfloat)x;
389 JRT_END
390
391 #ifdef __SOFTFP__
392 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
393 return x + y;
394 JRT_END
395
396 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
397 return x - y;
398 JRT_END
399
400 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
401 return x * y;
402 JRT_END
403
404 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
405 return x / y;
406 JRT_END
407
408 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
409 return x + y;
410 JRT_END
411
412 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
413 return x - y;
414 JRT_END
415
416 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
417 return x * y;
418 JRT_END
419
420 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
421 return x / y;
422 JRT_END
423
424 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
425 return (jdouble)x;
426 JRT_END
427
428 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
429 return (jdouble)x;
430 JRT_END
431
432 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
433 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
434 JRT_END
435
436 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
437 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
438 JRT_END
439
440 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
441 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
442 JRT_END
443
444 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
445 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
446 JRT_END
447
448 // Functions to return the opposite of the aeabi functions for nan.
449 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
450 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
451 JRT_END
452
453 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
454 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
455 JRT_END
456
457 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
458 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
459 JRT_END
460
461 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
462 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
463 JRT_END
464
465 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
466 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
467 JRT_END
468
469 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
470 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
471 JRT_END
472
473 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
474 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
475 JRT_END
476
477 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
478 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
479 JRT_END
480
481 // Intrinsics make gcc generate code for these.
482 float SharedRuntime::fneg(float f) {
483 return -f;
484 }
485
486 double SharedRuntime::dneg(double f) {
487 return -f;
488 }
489
490 #endif // __SOFTFP__
491
492 #if defined(__SOFTFP__) || defined(E500V2)
493 // Intrinsics make gcc generate code for these.
494 double SharedRuntime::dabs(double f) {
495 return (f <= (double)0.0) ? (double)0.0 - f : f;
496 }
497
498 #endif
499
500 #if defined(__SOFTFP__) || defined(PPC)
501 double SharedRuntime::dsqrt(double f) {
502 return sqrt(f);
503 }
504 #endif
505
506 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
507 if (g_isnan(x))
508 return 0;
509 if (x >= (jfloat) max_jint)
510 return max_jint;
511 if (x <= (jfloat) min_jint)
512 return min_jint;
513 return (jint) x;
514 JRT_END
515
516
517 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
518 if (g_isnan(x))
519 return 0;
520 if (x >= (jfloat) max_jlong)
521 return max_jlong;
522 if (x <= (jfloat) min_jlong)
523 return min_jlong;
524 return (jlong) x;
525 JRT_END
526
527
528 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
529 if (g_isnan(x))
530 return 0;
531 if (x >= (jdouble) max_jint)
532 return max_jint;
533 if (x <= (jdouble) min_jint)
534 return min_jint;
535 return (jint) x;
536 JRT_END
537
538
539 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
540 if (g_isnan(x))
541 return 0;
542 if (x >= (jdouble) max_jlong)
543 return max_jlong;
544 if (x <= (jdouble) min_jlong)
545 return min_jlong;
546 return (jlong) x;
547 JRT_END
548
549
550 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
551 return (jfloat)x;
552 JRT_END
553
554
555 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
556 return (jfloat)x;
557 JRT_END
558
559
560 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
561 return (jdouble)x;
562 JRT_END
563
564
565 // Exception handling across interpreter/compiler boundaries
566 //
567 // exception_handler_for_return_address(...) returns the continuation address.
568 // The continuation address is the entry point of the exception handler of the
569 // previous frame depending on the return address.
570
571 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* current, address return_address) {
572 // Note: This is called when we have unwound the frame of the callee that did
573 // throw an exception. So far, no check has been performed by the StackWatermarkSet.
574 // Notably, the stack is not walkable at this point, and hence the check must
575 // be deferred until later. Specifically, any of the handlers returned here in
576 // this function, will get dispatched to, and call deferred checks to
577 // StackWatermarkSet::after_unwind at a point where the stack is walkable.
578 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
579 assert(current->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
580
581 // Reset method handle flag.
582 current->set_is_method_handle_return(false);
583
584 #if INCLUDE_JVMCI
585 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
586 // and other exception handler continuations do not read it
587 current->set_exception_pc(nullptr);
588 #endif // INCLUDE_JVMCI
589
590 if (Continuation::is_return_barrier_entry(return_address)) {
591 return StubRoutines::cont_returnBarrierExc();
592 }
593
594 // The fastest case first
595 CodeBlob* blob = CodeCache::find_blob(return_address);
596 nmethod* nm = (blob != nullptr) ? blob->as_nmethod_or_null() : nullptr;
597 if (nm != nullptr) {
598 // Set flag if return address is a method handle call site.
599 current->set_is_method_handle_return(nm->is_method_handle_return(return_address));
600 // native nmethods don't have exception handlers
601 assert(!nm->is_native_method() || nm->method()->is_continuation_enter_intrinsic(), "no exception handler");
602 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
603 if (nm->is_deopt_pc(return_address)) {
604 // If we come here because of a stack overflow, the stack may be
605 // unguarded. Reguard the stack otherwise if we return to the
606 // deopt blob and the stack bang causes a stack overflow we
607 // crash.
608 StackOverflow* overflow_state = current->stack_overflow_state();
609 bool guard_pages_enabled = overflow_state->reguard_stack_if_needed();
610 if (overflow_state->reserved_stack_activation() != current->stack_base()) {
611 overflow_state->set_reserved_stack_activation(current->stack_base());
612 }
613 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
614 // The deferred StackWatermarkSet::after_unwind check will be performed in
615 // Deoptimization::fetch_unroll_info (with exec_mode == Unpack_exception)
616 return SharedRuntime::deopt_blob()->unpack_with_exception();
617 } else {
618 // The deferred StackWatermarkSet::after_unwind check will be performed in
619 // * OptoRuntime::handle_exception_C_helper for C2 code
620 // * exception_handler_for_pc_helper via Runtime1::handle_exception_from_callee_id for C1 code
621 return nm->exception_begin();
622 }
623 }
624
625 // Entry code
626 if (StubRoutines::returns_to_call_stub(return_address)) {
627 // The deferred StackWatermarkSet::after_unwind check will be performed in
628 // JavaCallWrapper::~JavaCallWrapper
629 return StubRoutines::catch_exception_entry();
630 }
631 if (blob != nullptr && blob->is_upcall_stub()) {
632 return StubRoutines::upcall_stub_exception_handler();
633 }
634 // Interpreted code
635 if (Interpreter::contains(return_address)) {
636 // The deferred StackWatermarkSet::after_unwind check will be performed in
637 // InterpreterRuntime::exception_handler_for_exception
638 return Interpreter::rethrow_exception_entry();
639 }
640
641 guarantee(blob == nullptr || !blob->is_runtime_stub(), "caller should have skipped stub");
642 guarantee(!VtableStubs::contains(return_address), "null exceptions in vtables should have been handled already!");
643
644 #ifndef PRODUCT
645 { ResourceMark rm;
646 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
647 os::print_location(tty, (intptr_t)return_address);
648 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
649 tty->print_cr("b) other problem");
650 }
651 #endif // PRODUCT
652 ShouldNotReachHere();
653 return nullptr;
654 }
655
656
657 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* current, address return_address))
658 return raw_exception_handler_for_return_address(current, return_address);
659 JRT_END
660
661
662 address SharedRuntime::get_poll_stub(address pc) {
663 address stub;
664 // Look up the code blob
665 CodeBlob *cb = CodeCache::find_blob(pc);
666
667 // Should be an nmethod
668 guarantee(cb != nullptr && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
669
670 // Look up the relocation information
671 assert(cb->as_nmethod()->is_at_poll_or_poll_return(pc),
672 "safepoint polling: type must be poll at pc " INTPTR_FORMAT, p2i(pc));
673
674 #ifdef ASSERT
675 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
676 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
677 Disassembler::decode(cb);
678 fatal("Only polling locations are used for safepoint");
679 }
680 #endif
681
682 bool at_poll_return = cb->as_nmethod()->is_at_poll_return(pc);
683 bool has_wide_vectors = cb->as_nmethod()->has_wide_vectors();
684 if (at_poll_return) {
685 assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
686 "polling page return stub not created yet");
687 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
688 } else if (has_wide_vectors) {
689 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != nullptr,
690 "polling page vectors safepoint stub not created yet");
691 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
692 } else {
693 assert(SharedRuntime::polling_page_safepoint_handler_blob() != nullptr,
694 "polling page safepoint stub not created yet");
695 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
696 }
697 log_debug(safepoint)("... found polling page %s exception at pc = "
698 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
699 at_poll_return ? "return" : "loop",
700 (intptr_t)pc, (intptr_t)stub);
701 return stub;
702 }
703
704 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception) {
705 if (JvmtiExport::can_post_on_exceptions()) {
706 vframeStream vfst(current, true);
707 methodHandle method = methodHandle(current, vfst.method());
708 address bcp = method()->bcp_from(vfst.bci());
709 JvmtiExport::post_exception_throw(current, method(), bcp, h_exception());
710 }
711
712 #if INCLUDE_JVMCI
713 if (EnableJVMCI) {
714 vframeStream vfst(current, true);
715 methodHandle method = methodHandle(current, vfst.method());
716 int bci = vfst.bci();
717 MethodData* trap_mdo = method->method_data();
718 if (trap_mdo != nullptr) {
719 // Set exception_seen if the exceptional bytecode is an invoke
720 Bytecode_invoke call = Bytecode_invoke_check(method, bci);
721 if (call.is_valid()) {
722 ResourceMark rm(current);
723
724 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
725 MutexLocker ml(trap_mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
726
727 ProfileData* pdata = trap_mdo->allocate_bci_to_data(bci, nullptr);
728 if (pdata != nullptr && pdata->is_BitData()) {
729 BitData* bit_data = (BitData*) pdata;
730 bit_data->set_exception_seen();
731 }
732 }
733 }
734 }
735 #endif
736
737 Exceptions::_throw(current, __FILE__, __LINE__, h_exception);
738 }
739
740 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message) {
741 Handle h_exception = Exceptions::new_exception(current, name, message);
742 throw_and_post_jvmti_exception(current, h_exception);
743 }
744
745 #if INCLUDE_JVMTI
746 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current))
747 assert(hide == JNI_FALSE, "must be VTMS transition finish");
748 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
749 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
750 JNIHandles::destroy_local(vthread);
751 JRT_END
752
753 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current))
754 assert(hide == JNI_TRUE, "must be VTMS transition start");
755 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
756 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
757 JNIHandles::destroy_local(vthread);
758 JRT_END
759
760 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current))
761 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
762 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
763 JNIHandles::destroy_local(vthread);
764 JRT_END
765
766 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current))
767 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
768 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
769 JNIHandles::destroy_local(vthread);
770 JRT_END
771 #endif // INCLUDE_JVMTI
772
773 // The interpreter code to call this tracing function is only
774 // called/generated when UL is on for redefine, class and has the right level
775 // and tags. Since obsolete methods are never compiled, we don't have
776 // to modify the compilers to generate calls to this function.
777 //
778 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
779 JavaThread* thread, Method* method))
780 if (method->is_obsolete()) {
781 // We are calling an obsolete method, but this is not necessarily
782 // an error. Our method could have been redefined just after we
783 // fetched the Method* from the constant pool.
784 ResourceMark rm;
785 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
786 }
787
788 LogStreamHandle(Trace, interpreter, bytecode) log;
789 if (log.is_enabled()) {
790 ResourceMark rm;
791 log.print("method entry: " INTPTR_FORMAT " %s %s%s%s%s",
792 p2i(thread),
793 (method->is_static() ? "static" : "virtual"),
794 method->name_and_sig_as_C_string(),
795 (method->is_native() ? " native" : ""),
796 (thread->class_being_initialized() != nullptr ? " clinit" : ""),
797 (method->method_holder()->is_initialized() ? "" : " being_initialized"));
798 }
799 return 0;
800 JRT_END
801
802 // ret_pc points into caller; we are returning caller's exception handler
803 // for given exception
804 // Note that the implementation of this method assumes it's only called when an exception has actually occured
805 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
806 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
807 assert(nm != nullptr, "must exist");
808 ResourceMark rm;
809
810 #if INCLUDE_JVMCI
811 if (nm->is_compiled_by_jvmci()) {
812 // lookup exception handler for this pc
813 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
814 ExceptionHandlerTable table(nm);
815 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
816 if (t != nullptr) {
817 return nm->code_begin() + t->pco();
818 } else {
819 return Deoptimization::deoptimize_for_missing_exception_handler(nm);
820 }
821 }
822 #endif // INCLUDE_JVMCI
823
824 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
825 // determine handler bci, if any
826 EXCEPTION_MARK;
827
828 int handler_bci = -1;
829 int scope_depth = 0;
830 if (!force_unwind) {
831 int bci = sd->bci();
832 bool recursive_exception = false;
833 do {
834 bool skip_scope_increment = false;
835 // exception handler lookup
836 Klass* ek = exception->klass();
837 methodHandle mh(THREAD, sd->method());
838 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
839 if (HAS_PENDING_EXCEPTION) {
840 recursive_exception = true;
841 // We threw an exception while trying to find the exception handler.
842 // Transfer the new exception to the exception handle which will
843 // be set into thread local storage, and do another lookup for an
844 // exception handler for this exception, this time starting at the
845 // BCI of the exception handler which caused the exception to be
846 // thrown (bugs 4307310 and 4546590). Set "exception" reference
847 // argument to ensure that the correct exception is thrown (4870175).
848 recursive_exception_occurred = true;
849 exception = Handle(THREAD, PENDING_EXCEPTION);
850 CLEAR_PENDING_EXCEPTION;
851 if (handler_bci >= 0) {
852 bci = handler_bci;
853 handler_bci = -1;
854 skip_scope_increment = true;
855 }
856 }
857 else {
858 recursive_exception = false;
859 }
860 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
861 sd = sd->sender();
862 if (sd != nullptr) {
863 bci = sd->bci();
864 }
865 ++scope_depth;
866 }
867 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != nullptr));
868 }
869
870 // found handling method => lookup exception handler
871 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
872
873 ExceptionHandlerTable table(nm);
874 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
875 if (t == nullptr && (nm->is_compiled_by_c1() || handler_bci != -1)) {
876 // Allow abbreviated catch tables. The idea is to allow a method
877 // to materialize its exceptions without committing to the exact
878 // routing of exceptions. In particular this is needed for adding
879 // a synthetic handler to unlock monitors when inlining
880 // synchronized methods since the unlock path isn't represented in
881 // the bytecodes.
882 t = table.entry_for(catch_pco, -1, 0);
883 }
884
885 #ifdef COMPILER1
886 if (t == nullptr && nm->is_compiled_by_c1()) {
887 assert(nm->unwind_handler_begin() != nullptr, "");
888 return nm->unwind_handler_begin();
889 }
890 #endif
891
892 if (t == nullptr) {
893 ttyLocker ttyl;
894 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d, catch_pco: %d", p2i(ret_pc), handler_bci, catch_pco);
895 tty->print_cr(" Exception:");
896 exception->print();
897 tty->cr();
898 tty->print_cr(" Compiled exception table :");
899 table.print();
900 nm->print();
901 nm->print_code();
902 guarantee(false, "missing exception handler");
903 return nullptr;
904 }
905
906 if (handler_bci != -1) { // did we find a handler in this method?
907 sd->method()->set_exception_handler_entered(handler_bci); // profile
908 }
909 return nm->code_begin() + t->pco();
910 }
911
912 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* current))
913 // These errors occur only at call sites
914 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_AbstractMethodError());
915 JRT_END
916
917 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
918 // These errors occur only at call sites
919 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
920 JRT_END
921
922 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* current))
923 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
924 JRT_END
925
926 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* current))
927 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
928 JRT_END
929
930 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* current))
931 // This entry point is effectively only used for NullPointerExceptions which occur at inline
932 // cache sites (when the callee activation is not yet set up) so we are at a call site
933 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
934 JRT_END
935
936 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* current))
937 throw_StackOverflowError_common(current, false);
938 JRT_END
939
940 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* current))
941 throw_StackOverflowError_common(current, true);
942 JRT_END
943
944 void SharedRuntime::throw_StackOverflowError_common(JavaThread* current, bool delayed) {
945 // We avoid using the normal exception construction in this case because
946 // it performs an upcall to Java, and we're already out of stack space.
947 JavaThread* THREAD = current; // For exception macros.
948 Klass* k = vmClasses::StackOverflowError_klass();
949 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
950 if (delayed) {
951 java_lang_Throwable::set_message(exception_oop,
952 Universe::delayed_stack_overflow_error_message());
953 }
954 Handle exception (current, exception_oop);
955 if (StackTraceInThrowable) {
956 java_lang_Throwable::fill_in_stack_trace(exception);
957 }
958 // Remove the ScopedValue bindings in case we got a
959 // StackOverflowError while we were trying to remove ScopedValue
960 // bindings.
961 current->clear_scopedValueBindings();
962 // Increment counter for hs_err file reporting
963 Atomic::inc(&Exceptions::_stack_overflow_errors);
964 throw_and_post_jvmti_exception(current, exception);
965 }
966
967 address SharedRuntime::continuation_for_implicit_exception(JavaThread* current,
968 address pc,
969 ImplicitExceptionKind exception_kind)
970 {
971 address target_pc = nullptr;
972
973 if (Interpreter::contains(pc)) {
974 switch (exception_kind) {
975 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
976 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
977 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
978 default: ShouldNotReachHere();
979 }
980 } else {
981 switch (exception_kind) {
982 case STACK_OVERFLOW: {
983 // Stack overflow only occurs upon frame setup; the callee is
984 // going to be unwound. Dispatch to a shared runtime stub
985 // which will cause the StackOverflowError to be fabricated
986 // and processed.
987 // Stack overflow should never occur during deoptimization:
988 // the compiled method bangs the stack by as much as the
989 // interpreter would need in case of a deoptimization. The
990 // deoptimization blob and uncommon trap blob bang the stack
991 // in a debug VM to verify the correctness of the compiled
992 // method stack banging.
993 assert(current->deopt_mark() == nullptr, "no stack overflow from deopt blob/uncommon trap");
994 Events::log_exception(current, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
995 return SharedRuntime::throw_StackOverflowError_entry();
996 }
997
998 case IMPLICIT_NULL: {
999 if (VtableStubs::contains(pc)) {
1000 // We haven't yet entered the callee frame. Fabricate an
1001 // exception and begin dispatching it in the caller. Since
1002 // the caller was at a call site, it's safe to destroy all
1003 // caller-saved registers, as these entry points do.
1004 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
1005
1006 // If vt_stub is null, then return null to signal handler to report the SEGV error.
1007 if (vt_stub == nullptr) return nullptr;
1008
1009 if (vt_stub->is_abstract_method_error(pc)) {
1010 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
1011 Events::log_exception(current, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
1012 // Instead of throwing the abstract method error here directly, we re-resolve
1013 // and will throw the AbstractMethodError during resolve. As a result, we'll
1014 // get a more detailed error message.
1015 return SharedRuntime::get_handle_wrong_method_stub();
1016 } else {
1017 Events::log_exception(current, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
1018 // Assert that the signal comes from the expected location in stub code.
1019 assert(vt_stub->is_null_pointer_exception(pc),
1020 "obtained signal from unexpected location in stub code");
1021 return SharedRuntime::throw_NullPointerException_at_call_entry();
1022 }
1023 } else {
1024 CodeBlob* cb = CodeCache::find_blob(pc);
1025
1026 // If code blob is null, then return null to signal handler to report the SEGV error.
1027 if (cb == nullptr) return nullptr;
1028
1029 // Exception happened in CodeCache. Must be either:
1030 // 1. Inline-cache check in C2I handler blob,
1031 // 2. Inline-cache check in nmethod, or
1032 // 3. Implicit null exception in nmethod
1033
1034 if (!cb->is_nmethod()) {
1035 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
1036 if (!is_in_blob) {
1037 // Allow normal crash reporting to handle this
1038 return nullptr;
1039 }
1040 Events::log_exception(current, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
1041 // There is no handler here, so we will simply unwind.
1042 return SharedRuntime::throw_NullPointerException_at_call_entry();
1043 }
1044
1045 // Otherwise, it's a compiled method. Consult its exception handlers.
1046 nmethod* nm = cb->as_nmethod();
1047 if (nm->inlinecache_check_contains(pc)) {
1048 // exception happened inside inline-cache check code
1049 // => the nmethod is not yet active (i.e., the frame
1050 // is not set up yet) => use return address pushed by
1051 // caller => don't push another return address
1052 Events::log_exception(current, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
1053 return SharedRuntime::throw_NullPointerException_at_call_entry();
1054 }
1055
1056 if (nm->method()->is_method_handle_intrinsic()) {
1057 // exception happened inside MH dispatch code, similar to a vtable stub
1058 Events::log_exception(current, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
1059 return SharedRuntime::throw_NullPointerException_at_call_entry();
1060 }
1061
1062 #ifndef PRODUCT
1063 _implicit_null_throws++;
1064 #endif
1065 target_pc = nm->continuation_for_implicit_null_exception(pc);
1066 // If there's an unexpected fault, target_pc might be null,
1067 // in which case we want to fall through into the normal
1068 // error handling code.
1069 }
1070
1071 break; // fall through
1072 }
1073
1074
1075 case IMPLICIT_DIVIDE_BY_ZERO: {
1076 nmethod* nm = CodeCache::find_nmethod(pc);
1077 guarantee(nm != nullptr, "must have containing compiled method for implicit division-by-zero exceptions");
1078 #ifndef PRODUCT
1079 _implicit_div0_throws++;
1080 #endif
1081 target_pc = nm->continuation_for_implicit_div0_exception(pc);
1082 // If there's an unexpected fault, target_pc might be null,
1083 // in which case we want to fall through into the normal
1084 // error handling code.
1085 break; // fall through
1086 }
1087
1088 default: ShouldNotReachHere();
1089 }
1090
1091 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
1092
1093 if (exception_kind == IMPLICIT_NULL) {
1094 #ifndef PRODUCT
1095 // for AbortVMOnException flag
1096 Exceptions::debug_check_abort("java.lang.NullPointerException");
1097 #endif //PRODUCT
1098 Events::log_exception(current, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1099 } else {
1100 #ifndef PRODUCT
1101 // for AbortVMOnException flag
1102 Exceptions::debug_check_abort("java.lang.ArithmeticException");
1103 #endif //PRODUCT
1104 Events::log_exception(current, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1105 }
1106 return target_pc;
1107 }
1108
1109 ShouldNotReachHere();
1110 return nullptr;
1111 }
1112
1113
1114 /**
1115 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
1116 * installed in the native function entry of all native Java methods before
1117 * they get linked to their actual native methods.
1118 *
1119 * \note
1120 * This method actually never gets called! The reason is because
1121 * the interpreter's native entries call NativeLookup::lookup() which
1122 * throws the exception when the lookup fails. The exception is then
1123 * caught and forwarded on the return from NativeLookup::lookup() call
1124 * before the call to the native function. This might change in the future.
1125 */
1126 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
1127 {
1128 // We return a bad value here to make sure that the exception is
1129 // forwarded before we look at the return value.
1130 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
1131 }
1132 JNI_END
1133
1134 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
1135 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
1136 }
1137
1138 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
1139 #if INCLUDE_JVMCI
1140 if (!obj->klass()->has_finalizer()) {
1141 return;
1142 }
1143 #endif // INCLUDE_JVMCI
1144 assert(oopDesc::is_oop(obj), "must be a valid oop");
1145 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1146 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1147 JRT_END
1148
1149 jlong SharedRuntime::get_java_tid(JavaThread* thread) {
1150 assert(thread != nullptr, "No thread");
1151 if (thread == nullptr) {
1152 return 0;
1153 }
1154 guarantee(Thread::current() != thread || thread->is_oop_safe(),
1155 "current cannot touch oops after its GC barrier is detached.");
1156 oop obj = thread->threadObj();
1157 return (obj == nullptr) ? 0 : java_lang_Thread::thread_id(obj);
1158 }
1159
1160 /**
1161 * This function ought to be a void function, but cannot be because
1162 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1163 * 6254741. Once that is fixed we can remove the dummy return value.
1164 */
1165 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1166 return dtrace_object_alloc(JavaThread::current(), o, o->size());
1167 }
1168
1169 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o) {
1170 return dtrace_object_alloc(thread, o, o->size());
1171 }
1172
1173 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size) {
1174 assert(DTraceAllocProbes, "wrong call");
1175 Klass* klass = o->klass();
1176 Symbol* name = klass->name();
1177 HOTSPOT_OBJECT_ALLOC(
1178 get_java_tid(thread),
1179 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1180 return 0;
1181 }
1182
1183 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1184 JavaThread* current, Method* method))
1185 assert(current == JavaThread::current(), "pre-condition");
1186
1187 assert(DTraceMethodProbes, "wrong call");
1188 Symbol* kname = method->klass_name();
1189 Symbol* name = method->name();
1190 Symbol* sig = method->signature();
1191 HOTSPOT_METHOD_ENTRY(
1192 get_java_tid(current),
1193 (char *) kname->bytes(), kname->utf8_length(),
1194 (char *) name->bytes(), name->utf8_length(),
1195 (char *) sig->bytes(), sig->utf8_length());
1196 return 0;
1197 JRT_END
1198
1199 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1200 JavaThread* current, Method* method))
1201 assert(current == JavaThread::current(), "pre-condition");
1202 assert(DTraceMethodProbes, "wrong call");
1203 Symbol* kname = method->klass_name();
1204 Symbol* name = method->name();
1205 Symbol* sig = method->signature();
1206 HOTSPOT_METHOD_RETURN(
1207 get_java_tid(current),
1208 (char *) kname->bytes(), kname->utf8_length(),
1209 (char *) name->bytes(), name->utf8_length(),
1210 (char *) sig->bytes(), sig->utf8_length());
1211 return 0;
1212 JRT_END
1213
1214
1215 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1216 // for a call current in progress, i.e., arguments has been pushed on stack
1217 // put callee has not been invoked yet. Used by: resolve virtual/static,
1218 // vtable updates, etc. Caller frame must be compiled.
1219 Handle SharedRuntime::find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1220 JavaThread* current = THREAD;
1221 ResourceMark rm(current);
1222
1223 // last java frame on stack (which includes native call frames)
1224 vframeStream vfst(current, true); // Do not skip and javaCalls
1225
1226 return find_callee_info_helper(vfst, bc, callinfo, THREAD);
1227 }
1228
1229 Method* SharedRuntime::extract_attached_method(vframeStream& vfst) {
1230 nmethod* caller = vfst.nm();
1231
1232 address pc = vfst.frame_pc();
1233 { // Get call instruction under lock because another thread may be busy patching it.
1234 CompiledICLocker ic_locker(caller);
1235 return caller->attached_method_before_pc(pc);
1236 }
1237 return nullptr;
1238 }
1239
1240 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1241 // for a call current in progress, i.e., arguments has been pushed on stack
1242 // but callee has not been invoked yet. Caller frame must be compiled.
1243 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1244 CallInfo& callinfo, TRAPS) {
1245 Handle receiver;
1246 Handle nullHandle; // create a handy null handle for exception returns
1247 JavaThread* current = THREAD;
1248
1249 assert(!vfst.at_end(), "Java frame must exist");
1250
1251 // Find caller and bci from vframe
1252 methodHandle caller(current, vfst.method());
1253 int bci = vfst.bci();
1254
1255 if (caller->is_continuation_enter_intrinsic()) {
1256 bc = Bytecodes::_invokestatic;
1257 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1258 return receiver;
1259 }
1260
1261 Bytecode_invoke bytecode(caller, bci);
1262 int bytecode_index = bytecode.index();
1263 bc = bytecode.invoke_code();
1264
1265 methodHandle attached_method(current, extract_attached_method(vfst));
1266 if (attached_method.not_null()) {
1267 Method* callee = bytecode.static_target(CHECK_NH);
1268 vmIntrinsics::ID id = callee->intrinsic_id();
1269 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1270 // it attaches statically resolved method to the call site.
1271 if (MethodHandles::is_signature_polymorphic(id) &&
1272 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1273 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1274
1275 // Adjust invocation mode according to the attached method.
1276 switch (bc) {
1277 case Bytecodes::_invokevirtual:
1278 if (attached_method->method_holder()->is_interface()) {
1279 bc = Bytecodes::_invokeinterface;
1280 }
1281 break;
1282 case Bytecodes::_invokeinterface:
1283 if (!attached_method->method_holder()->is_interface()) {
1284 bc = Bytecodes::_invokevirtual;
1285 }
1286 break;
1287 case Bytecodes::_invokehandle:
1288 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1289 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1290 : Bytecodes::_invokevirtual;
1291 }
1292 break;
1293 default:
1294 break;
1295 }
1296 }
1297 }
1298
1299 assert(bc != Bytecodes::_illegal, "not initialized");
1300
1301 bool has_receiver = bc != Bytecodes::_invokestatic &&
1302 bc != Bytecodes::_invokedynamic &&
1303 bc != Bytecodes::_invokehandle;
1304
1305 // Find receiver for non-static call
1306 if (has_receiver) {
1307 // This register map must be update since we need to find the receiver for
1308 // compiled frames. The receiver might be in a register.
1309 RegisterMap reg_map2(current,
1310 RegisterMap::UpdateMap::include,
1311 RegisterMap::ProcessFrames::include,
1312 RegisterMap::WalkContinuation::skip);
1313 frame stubFrame = current->last_frame();
1314 // Caller-frame is a compiled frame
1315 frame callerFrame = stubFrame.sender(®_map2);
1316
1317 if (attached_method.is_null()) {
1318 Method* callee = bytecode.static_target(CHECK_NH);
1319 if (callee == nullptr) {
1320 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1321 }
1322 }
1323
1324 // Retrieve from a compiled argument list
1325 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1326 assert(oopDesc::is_oop_or_null(receiver()), "");
1327
1328 if (receiver.is_null()) {
1329 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1330 }
1331 }
1332
1333 // Resolve method
1334 if (attached_method.not_null()) {
1335 // Parameterized by attached method.
1336 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1337 } else {
1338 // Parameterized by bytecode.
1339 constantPoolHandle constants(current, caller->constants());
1340 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1341 }
1342
1343 #ifdef ASSERT
1344 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1345 if (has_receiver) {
1346 assert(receiver.not_null(), "should have thrown exception");
1347 Klass* receiver_klass = receiver->klass();
1348 Klass* rk = nullptr;
1349 if (attached_method.not_null()) {
1350 // In case there's resolved method attached, use its holder during the check.
1351 rk = attached_method->method_holder();
1352 } else {
1353 // Klass is already loaded.
1354 constantPoolHandle constants(current, caller->constants());
1355 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1356 }
1357 Klass* static_receiver_klass = rk;
1358 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1359 "actual receiver must be subclass of static receiver klass");
1360 if (receiver_klass->is_instance_klass()) {
1361 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1362 tty->print_cr("ERROR: Klass not yet initialized!!");
1363 receiver_klass->print();
1364 }
1365 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1366 }
1367 }
1368 #endif
1369
1370 return receiver;
1371 }
1372
1373 methodHandle SharedRuntime::find_callee_method(TRAPS) {
1374 JavaThread* current = THREAD;
1375 ResourceMark rm(current);
1376 // We need first to check if any Java activations (compiled, interpreted)
1377 // exist on the stack since last JavaCall. If not, we need
1378 // to get the target method from the JavaCall wrapper.
1379 vframeStream vfst(current, true); // Do not skip any javaCalls
1380 methodHandle callee_method;
1381 if (vfst.at_end()) {
1382 // No Java frames were found on stack since we did the JavaCall.
1383 // Hence the stack can only contain an entry_frame. We need to
1384 // find the target method from the stub frame.
1385 RegisterMap reg_map(current,
1386 RegisterMap::UpdateMap::skip,
1387 RegisterMap::ProcessFrames::include,
1388 RegisterMap::WalkContinuation::skip);
1389 frame fr = current->last_frame();
1390 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1391 fr = fr.sender(®_map);
1392 assert(fr.is_entry_frame(), "must be");
1393 // fr is now pointing to the entry frame.
1394 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1395 } else {
1396 Bytecodes::Code bc;
1397 CallInfo callinfo;
1398 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1399 callee_method = methodHandle(current, callinfo.selected_method());
1400 }
1401 assert(callee_method()->is_method(), "must be");
1402 return callee_method;
1403 }
1404
1405 // Resolves a call.
1406 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1407 JavaThread* current = THREAD;
1408 ResourceMark rm(current);
1409 RegisterMap cbl_map(current,
1410 RegisterMap::UpdateMap::skip,
1411 RegisterMap::ProcessFrames::include,
1412 RegisterMap::WalkContinuation::skip);
1413 frame caller_frame = current->last_frame().sender(&cbl_map);
1414
1415 CodeBlob* caller_cb = caller_frame.cb();
1416 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1417 nmethod* caller_nm = caller_cb->as_nmethod();
1418
1419 // determine call info & receiver
1420 // note: a) receiver is null for static calls
1421 // b) an exception is thrown if receiver is null for non-static calls
1422 CallInfo call_info;
1423 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1424 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1425
1426 NoSafepointVerifier nsv;
1427
1428 methodHandle callee_method(current, call_info.selected_method());
1429
1430 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1431 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1432 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1433 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1434 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1435
1436 assert(!caller_nm->is_unloading(), "It should not be unloading");
1437
1438 // tracing/debugging/statistics
1439 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1440 (is_virtual) ? (&_resolve_virtual_ctr) :
1441 (&_resolve_static_ctr);
1442 Atomic::inc(addr);
1443
1444 #ifndef PRODUCT
1445 if (TraceCallFixup) {
1446 ResourceMark rm(current);
1447 tty->print("resolving %s%s (%s) call to",
1448 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1449 Bytecodes::name(invoke_code));
1450 callee_method->print_short_name(tty);
1451 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1452 p2i(caller_frame.pc()), p2i(callee_method->code()));
1453 }
1454 #endif
1455
1456 if (invoke_code == Bytecodes::_invokestatic) {
1457 assert(callee_method->method_holder()->is_initialized() ||
1458 callee_method->method_holder()->is_reentrant_initialization(current),
1459 "invalid class initialization state for invoke_static");
1460 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1461 // In order to keep class initialization check, do not patch call
1462 // site for static call when the class is not fully initialized.
1463 // Proper check is enforced by call site re-resolution on every invocation.
1464 //
1465 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1466 // explicit class initialization check is put in nmethod entry (VEP).
1467 assert(callee_method->method_holder()->is_linked(), "must be");
1468 return callee_method;
1469 }
1470 }
1471
1472
1473 // JSR 292 key invariant:
1474 // If the resolved method is a MethodHandle invoke target, the call
1475 // site must be a MethodHandle call site, because the lambda form might tail-call
1476 // leaving the stack in a state unknown to either caller or callee
1477
1478 // Compute entry points. The computation of the entry points is independent of
1479 // patching the call.
1480
1481 // Make sure the callee nmethod does not get deoptimized and removed before
1482 // we are done patching the code.
1483
1484
1485 CompiledICLocker ml(caller_nm);
1486 if (is_virtual && !is_optimized) {
1487 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1488 inline_cache->update(&call_info, receiver->klass());
1489 } else {
1490 // Callsite is a direct call - set it to the destination method
1491 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1492 callsite->set(callee_method);
1493 }
1494
1495 return callee_method;
1496 }
1497
1498 // Inline caches exist only in compiled code
1499 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1500 PerfTraceTime timer(_perf_ic_miss_total_time);
1501
1502 #ifdef ASSERT
1503 RegisterMap reg_map(current,
1504 RegisterMap::UpdateMap::skip,
1505 RegisterMap::ProcessFrames::include,
1506 RegisterMap::WalkContinuation::skip);
1507 frame stub_frame = current->last_frame();
1508 assert(stub_frame.is_runtime_frame(), "sanity check");
1509 frame caller_frame = stub_frame.sender(®_map);
1510 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1511 #endif /* ASSERT */
1512
1513 methodHandle callee_method;
1514 JRT_BLOCK
1515 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1516 // Return Method* through TLS
1517 current->set_vm_result_2(callee_method());
1518 JRT_BLOCK_END
1519 // return compiled code entry point after potential safepoints
1520 return get_resolved_entry(current, callee_method);
1521 JRT_END
1522
1523
1524 // Handle call site that has been made non-entrant
1525 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1526 PerfTraceTime timer(_perf_handle_wrong_method_total_time);
1527
1528 // 6243940 We might end up in here if the callee is deoptimized
1529 // as we race to call it. We don't want to take a safepoint if
1530 // the caller was interpreted because the caller frame will look
1531 // interpreted to the stack walkers and arguments are now
1532 // "compiled" so it is much better to make this transition
1533 // invisible to the stack walking code. The i2c path will
1534 // place the callee method in the callee_target. It is stashed
1535 // there because if we try and find the callee by normal means a
1536 // safepoint is possible and have trouble gc'ing the compiled args.
1537 RegisterMap reg_map(current,
1538 RegisterMap::UpdateMap::skip,
1539 RegisterMap::ProcessFrames::include,
1540 RegisterMap::WalkContinuation::skip);
1541 frame stub_frame = current->last_frame();
1542 assert(stub_frame.is_runtime_frame(), "sanity check");
1543 frame caller_frame = stub_frame.sender(®_map);
1544
1545 if (caller_frame.is_interpreted_frame() ||
1546 caller_frame.is_entry_frame() ||
1547 caller_frame.is_upcall_stub_frame()) {
1548 Method* callee = current->callee_target();
1549 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1550 current->set_vm_result_2(callee);
1551 current->set_callee_target(nullptr);
1552 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1553 // Bypass class initialization checks in c2i when caller is in native.
1554 // JNI calls to static methods don't have class initialization checks.
1555 // Fast class initialization checks are present in c2i adapters and call into
1556 // SharedRuntime::handle_wrong_method() on the slow path.
1557 //
1558 // JVM upcalls may land here as well, but there's a proper check present in
1559 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1560 // so bypassing it in c2i adapter is benign.
1561 return callee->get_c2i_no_clinit_check_entry();
1562 } else {
1563 return callee->get_c2i_entry();
1564 }
1565 }
1566
1567 // Must be compiled to compiled path which is safe to stackwalk
1568 methodHandle callee_method;
1569 JRT_BLOCK
1570 // Force resolving of caller (if we called from compiled frame)
1571 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1572 current->set_vm_result_2(callee_method());
1573 JRT_BLOCK_END
1574 // return compiled code entry point after potential safepoints
1575 return get_resolved_entry(current, callee_method);
1576 JRT_END
1577
1578 // Handle abstract method call
1579 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1580 PerfTraceTime timer(_perf_handle_wrong_method_total_time);
1581
1582 // Verbose error message for AbstractMethodError.
1583 // Get the called method from the invoke bytecode.
1584 vframeStream vfst(current, true);
1585 assert(!vfst.at_end(), "Java frame must exist");
1586 methodHandle caller(current, vfst.method());
1587 Bytecode_invoke invoke(caller, vfst.bci());
1588 DEBUG_ONLY( invoke.verify(); )
1589
1590 // Find the compiled caller frame.
1591 RegisterMap reg_map(current,
1592 RegisterMap::UpdateMap::include,
1593 RegisterMap::ProcessFrames::include,
1594 RegisterMap::WalkContinuation::skip);
1595 frame stubFrame = current->last_frame();
1596 assert(stubFrame.is_runtime_frame(), "must be");
1597 frame callerFrame = stubFrame.sender(®_map);
1598 assert(callerFrame.is_compiled_frame(), "must be");
1599
1600 // Install exception and return forward entry.
1601 address res = SharedRuntime::throw_AbstractMethodError_entry();
1602 JRT_BLOCK
1603 methodHandle callee(current, invoke.static_target(current));
1604 if (!callee.is_null()) {
1605 oop recv = callerFrame.retrieve_receiver(®_map);
1606 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1607 res = StubRoutines::forward_exception_entry();
1608 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1609 }
1610 JRT_BLOCK_END
1611 return res;
1612 JRT_END
1613
1614 // return verified_code_entry if interp_only_mode is not set for the current thread;
1615 // otherwise return c2i entry.
1616 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method) {
1617 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1618 // In interp_only_mode we need to go to the interpreted entry
1619 // The c2i won't patch in this mode -- see fixup_callers_callsite
1620 return callee_method->get_c2i_entry();
1621 }
1622 assert(callee_method->verified_code_entry() != nullptr, " Jump to zero!");
1623 return callee_method->verified_code_entry();
1624 }
1625
1626 // resolve a static call and patch code
1627 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1628 PerfTraceTime timer(_perf_resolve_static_total_time);
1629
1630 methodHandle callee_method;
1631 bool enter_special = false;
1632 JRT_BLOCK
1633 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1634 current->set_vm_result_2(callee_method());
1635 JRT_BLOCK_END
1636 // return compiled code entry point after potential safepoints
1637 return get_resolved_entry(current, callee_method);
1638 JRT_END
1639
1640 // resolve virtual call and update inline cache to monomorphic
1641 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1642 PerfTraceTime timer(_perf_resolve_virtual_total_time);
1643
1644 methodHandle callee_method;
1645 JRT_BLOCK
1646 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1647 current->set_vm_result_2(callee_method());
1648 JRT_BLOCK_END
1649 // return compiled code entry point after potential safepoints
1650 return get_resolved_entry(current, callee_method);
1651 JRT_END
1652
1653
1654 // Resolve a virtual call that can be statically bound (e.g., always
1655 // monomorphic, so it has no inline cache). Patch code to resolved target.
1656 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1657 PerfTraceTime timer(_perf_resolve_opt_virtual_total_time);
1658
1659 methodHandle callee_method;
1660 JRT_BLOCK
1661 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1662 current->set_vm_result_2(callee_method());
1663 JRT_BLOCK_END
1664 // return compiled code entry point after potential safepoints
1665 return get_resolved_entry(current, callee_method);
1666 JRT_END
1667
1668 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1669 JavaThread* current = THREAD;
1670 ResourceMark rm(current);
1671 CallInfo call_info;
1672 Bytecodes::Code bc;
1673
1674 // receiver is null for static calls. An exception is thrown for null
1675 // receivers for non-static calls
1676 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1677
1678 methodHandle callee_method(current, call_info.selected_method());
1679
1680 Atomic::inc(&_ic_miss_ctr);
1681
1682 #ifndef PRODUCT
1683 // Statistics & Tracing
1684 if (TraceCallFixup) {
1685 ResourceMark rm(current);
1686 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1687 callee_method->print_short_name(tty);
1688 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1689 }
1690
1691 if (ICMissHistogram) {
1692 MutexLocker m(VMStatistic_lock);
1693 RegisterMap reg_map(current,
1694 RegisterMap::UpdateMap::skip,
1695 RegisterMap::ProcessFrames::include,
1696 RegisterMap::WalkContinuation::skip);
1697 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1698 // produce statistics under the lock
1699 trace_ic_miss(f.pc());
1700 }
1701 #endif
1702
1703 // install an event collector so that when a vtable stub is created the
1704 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1705 // event can't be posted when the stub is created as locks are held
1706 // - instead the event will be deferred until the event collector goes
1707 // out of scope.
1708 JvmtiDynamicCodeEventCollector event_collector;
1709
1710 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1711 RegisterMap reg_map(current,
1712 RegisterMap::UpdateMap::skip,
1713 RegisterMap::ProcessFrames::include,
1714 RegisterMap::WalkContinuation::skip);
1715 frame caller_frame = current->last_frame().sender(®_map);
1716 CodeBlob* cb = caller_frame.cb();
1717 nmethod* caller_nm = cb->as_nmethod();
1718
1719 CompiledICLocker ml(caller_nm);
1720 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1721 inline_cache->update(&call_info, receiver()->klass());
1722
1723 return callee_method;
1724 }
1725
1726 //
1727 // Resets a call-site in compiled code so it will get resolved again.
1728 // This routines handles both virtual call sites, optimized virtual call
1729 // sites, and static call sites. Typically used to change a call sites
1730 // destination from compiled to interpreted.
1731 //
1732 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1733 JavaThread* current = THREAD;
1734 ResourceMark rm(current);
1735 RegisterMap reg_map(current,
1736 RegisterMap::UpdateMap::skip,
1737 RegisterMap::ProcessFrames::include,
1738 RegisterMap::WalkContinuation::skip);
1739 frame stub_frame = current->last_frame();
1740 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1741 frame caller = stub_frame.sender(®_map);
1742
1743 // Do nothing if the frame isn't a live compiled frame.
1744 // nmethod could be deoptimized by the time we get here
1745 // so no update to the caller is needed.
1746
1747 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1748 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1749
1750 address pc = caller.pc();
1751
1752 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1753 assert(caller_nm != nullptr, "did not find caller nmethod");
1754
1755 // Default call_addr is the location of the "basic" call.
1756 // Determine the address of the call we a reresolving. With
1757 // Inline Caches we will always find a recognizable call.
1758 // With Inline Caches disabled we may or may not find a
1759 // recognizable call. We will always find a call for static
1760 // calls and for optimized virtual calls. For vanilla virtual
1761 // calls it depends on the state of the UseInlineCaches switch.
1762 //
1763 // With Inline Caches disabled we can get here for a virtual call
1764 // for two reasons:
1765 // 1 - calling an abstract method. The vtable for abstract methods
1766 // will run us thru handle_wrong_method and we will eventually
1767 // end up in the interpreter to throw the ame.
1768 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1769 // call and between the time we fetch the entry address and
1770 // we jump to it the target gets deoptimized. Similar to 1
1771 // we will wind up in the interprter (thru a c2i with c2).
1772 //
1773 CompiledICLocker ml(caller_nm);
1774 address call_addr = caller_nm->call_instruction_address(pc);
1775
1776 if (call_addr != nullptr) {
1777 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1778 // bytes back in the instruction stream so we must also check for reloc info.
1779 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1780 bool ret = iter.next(); // Get item
1781 if (ret) {
1782 switch (iter.type()) {
1783 case relocInfo::static_call_type:
1784 case relocInfo::opt_virtual_call_type: {
1785 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1786 cdc->set_to_clean();
1787 break;
1788 }
1789
1790 case relocInfo::virtual_call_type: {
1791 // compiled, dispatched call (which used to call an interpreted method)
1792 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1793 inline_cache->set_to_clean();
1794 break;
1795 }
1796 default:
1797 break;
1798 }
1799 }
1800 }
1801 }
1802
1803 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1804
1805 Atomic::inc(&_wrong_method_ctr);
1806
1807 #ifndef PRODUCT
1808 if (TraceCallFixup) {
1809 ResourceMark rm(current);
1810 tty->print("handle_wrong_method reresolving call to");
1811 callee_method->print_short_name(tty);
1812 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1813 }
1814 #endif
1815
1816 return callee_method;
1817 }
1818
1819 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1820 // The faulting unsafe accesses should be changed to throw the error
1821 // synchronously instead. Meanwhile the faulting instruction will be
1822 // skipped over (effectively turning it into a no-op) and an
1823 // asynchronous exception will be raised which the thread will
1824 // handle at a later point. If the instruction is a load it will
1825 // return garbage.
1826
1827 // Request an async exception.
1828 thread->set_pending_unsafe_access_error();
1829
1830 // Return address of next instruction to execute.
1831 return next_pc;
1832 }
1833
1834 #ifdef ASSERT
1835 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1836 const BasicType* sig_bt,
1837 const VMRegPair* regs) {
1838 ResourceMark rm;
1839 const int total_args_passed = method->size_of_parameters();
1840 const VMRegPair* regs_with_member_name = regs;
1841 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1842
1843 const int member_arg_pos = total_args_passed - 1;
1844 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1845 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1846
1847 java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1);
1848
1849 for (int i = 0; i < member_arg_pos; i++) {
1850 VMReg a = regs_with_member_name[i].first();
1851 VMReg b = regs_without_member_name[i].first();
1852 assert(a->value() == b->value(), "register allocation mismatch: a= %d, b= %d", a->value(), b->value());
1853 }
1854 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1855 }
1856 #endif
1857
1858 // ---------------------------------------------------------------------------
1859 // We are calling the interpreter via a c2i. Normally this would mean that
1860 // we were called by a compiled method. However we could have lost a race
1861 // where we went int -> i2c -> c2i and so the caller could in fact be
1862 // interpreted. If the caller is compiled we attempt to patch the caller
1863 // so he no longer calls into the interpreter.
1864 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1865 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1866
1867 // It's possible that deoptimization can occur at a call site which hasn't
1868 // been resolved yet, in which case this function will be called from
1869 // an nmethod that has been patched for deopt and we can ignore the
1870 // request for a fixup.
1871 // Also it is possible that we lost a race in that from_compiled_entry
1872 // is now back to the i2c in that case we don't need to patch and if
1873 // we did we'd leap into space because the callsite needs to use
1874 // "to interpreter" stub in order to load up the Method*. Don't
1875 // ask me how I know this...
1876
1877 // Result from nmethod::is_unloading is not stable across safepoints.
1878 NoSafepointVerifier nsv;
1879
1880 nmethod* callee = method->code();
1881 if (callee == nullptr) {
1882 return;
1883 }
1884
1885 // write lock needed because we might patch call site by set_to_clean()
1886 // and is_unloading() can modify nmethod's state
1887 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, JavaThread::current()));
1888
1889 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1890 if (cb == nullptr || !cb->is_nmethod() || !callee->is_in_use() || callee->is_unloading()) {
1891 return;
1892 }
1893
1894 // The check above makes sure this is an nmethod.
1895 nmethod* caller = cb->as_nmethod();
1896
1897 // Get the return PC for the passed caller PC.
1898 address return_pc = caller_pc + frame::pc_return_offset;
1899
1900 if (!caller->is_in_use() || !NativeCall::is_call_before(return_pc)) {
1901 return;
1902 }
1903
1904 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1905 CompiledICLocker ic_locker(caller);
1906 ResourceMark rm;
1907
1908 // If we got here through a static call or opt_virtual call, then we know where the
1909 // call address would be; let's peek at it
1910 address callsite_addr = (address)nativeCall_before(return_pc);
1911 RelocIterator iter(caller, callsite_addr, callsite_addr + 1);
1912 if (!iter.next()) {
1913 // No reloc entry found; not a static or optimized virtual call
1914 return;
1915 }
1916
1917 relocInfo::relocType type = iter.reloc()->type();
1918 if (type != relocInfo::static_call_type &&
1919 type != relocInfo::opt_virtual_call_type) {
1920 return;
1921 }
1922
1923 CompiledDirectCall* callsite = CompiledDirectCall::before(return_pc);
1924 callsite->set_to_clean();
1925 JRT_END
1926
1927
1928 // same as JVM_Arraycopy, but called directly from compiled code
1929 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1930 oopDesc* dest, jint dest_pos,
1931 jint length,
1932 JavaThread* current)) {
1933 #ifndef PRODUCT
1934 _slow_array_copy_ctr++;
1935 #endif
1936 // Check if we have null pointers
1937 if (src == nullptr || dest == nullptr) {
1938 THROW(vmSymbols::java_lang_NullPointerException());
1939 }
1940 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1941 // even though the copy_array API also performs dynamic checks to ensure
1942 // that src and dest are truly arrays (and are conformable).
1943 // The copy_array mechanism is awkward and could be removed, but
1944 // the compilers don't call this function except as a last resort,
1945 // so it probably doesn't matter.
1946 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1947 (arrayOopDesc*)dest, dest_pos,
1948 length, current);
1949 }
1950 JRT_END
1951
1952 // The caller of generate_class_cast_message() (or one of its callers)
1953 // must use a ResourceMark in order to correctly free the result.
1954 char* SharedRuntime::generate_class_cast_message(
1955 JavaThread* thread, Klass* caster_klass) {
1956
1957 // Get target class name from the checkcast instruction
1958 vframeStream vfst(thread, true);
1959 assert(!vfst.at_end(), "Java frame must exist");
1960 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1961 constantPoolHandle cpool(thread, vfst.method()->constants());
1962 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1963 Symbol* target_klass_name = nullptr;
1964 if (target_klass == nullptr) {
1965 // This klass should be resolved, but just in case, get the name in the klass slot.
1966 target_klass_name = cpool->klass_name_at(cc.index());
1967 }
1968 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1969 }
1970
1971
1972 // The caller of generate_class_cast_message() (or one of its callers)
1973 // must use a ResourceMark in order to correctly free the result.
1974 char* SharedRuntime::generate_class_cast_message(
1975 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1976 const char* caster_name = caster_klass->external_name();
1977
1978 assert(target_klass != nullptr || target_klass_name != nullptr, "one must be provided");
1979 const char* target_name = target_klass == nullptr ? target_klass_name->as_klass_external_name() :
1980 target_klass->external_name();
1981
1982 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
1983
1984 const char* caster_klass_description = "";
1985 const char* target_klass_description = "";
1986 const char* klass_separator = "";
1987 if (target_klass != nullptr && caster_klass->module() == target_klass->module()) {
1988 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
1989 } else {
1990 caster_klass_description = caster_klass->class_in_module_of_loader();
1991 target_klass_description = (target_klass != nullptr) ? target_klass->class_in_module_of_loader() : "";
1992 klass_separator = (target_klass != nullptr) ? "; " : "";
1993 }
1994
1995 // add 3 for parenthesis and preceding space
1996 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
1997
1998 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1999 if (message == nullptr) {
2000 // Shouldn't happen, but don't cause even more problems if it does
2001 message = const_cast<char*>(caster_klass->external_name());
2002 } else {
2003 jio_snprintf(message,
2004 msglen,
2005 "class %s cannot be cast to class %s (%s%s%s)",
2006 caster_name,
2007 target_name,
2008 caster_klass_description,
2009 klass_separator,
2010 target_klass_description
2011 );
2012 }
2013 return message;
2014 }
2015
2016 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2017 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
2018 JRT_END
2019
2020 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
2021 if (!SafepointSynchronize::is_synchronizing()) {
2022 // Only try quick_enter() if we're not trying to reach a safepoint
2023 // so that the calling thread reaches the safepoint more quickly.
2024 if (ObjectSynchronizer::quick_enter(obj, lock, current)) {
2025 return;
2026 }
2027 }
2028 // NO_ASYNC required because an async exception on the state transition destructor
2029 // would leave you with the lock held and it would never be released.
2030 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2031 // and the model is that an exception implies the method failed.
2032 JRT_BLOCK_NO_ASYNC
2033 Handle h_obj(THREAD, obj);
2034 ObjectSynchronizer::enter(h_obj, lock, current);
2035 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2036 JRT_BLOCK_END
2037 }
2038
2039 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
2040 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
2041 SharedRuntime::monitor_enter_helper(obj, lock, current);
2042 JRT_END
2043
2044 void SharedRuntime::monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
2045 assert(JavaThread::current() == current, "invariant");
2046 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2047 ExceptionMark em(current);
2048
2049 // Check if C2_MacroAssembler::fast_unlock() or
2050 // C2_MacroAssembler::fast_unlock_lightweight() unlocked an inflated
2051 // monitor before going slow path. Since there is no safepoint
2052 // polling when calling into the VM, we can be sure that the monitor
2053 // hasn't been deallocated.
2054 ObjectMonitor* m = current->unlocked_inflated_monitor();
2055 if (m != nullptr) {
2056 assert(!m->has_owner(current), "must be");
2057 current->clear_unlocked_inflated_monitor();
2058
2059 // We need to reacquire the lock before we can call ObjectSynchronizer::exit().
2060 if (!m->try_enter(current, /*check_for_recursion*/ false)) {
2061 // Some other thread acquired the lock (or the monitor was
2062 // deflated). Either way we are done.
2063 current->dec_held_monitor_count();
2064 return;
2065 }
2066 }
2067
2068 // The object could become unlocked through a JNI call, which we have no other checks for.
2069 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
2070 if (obj->is_unlocked()) {
2071 if (CheckJNICalls) {
2072 fatal("Object has been unlocked by JNI");
2073 }
2074 return;
2075 }
2076 ObjectSynchronizer::exit(obj, lock, current);
2077 }
2078
2079 // Handles the uncommon cases of monitor unlocking in compiled code
2080 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
2081 assert(current == JavaThread::current(), "pre-condition");
2082 SharedRuntime::monitor_exit_helper(obj, lock, current);
2083 JRT_END
2084
2085 // This is only called when CheckJNICalls is true, and only
2086 // for virtual thread termination.
2087 JRT_LEAF(void, SharedRuntime::log_jni_monitor_still_held())
2088 assert(CheckJNICalls, "Only call this when checking JNI usage");
2089 if (log_is_enabled(Debug, jni)) {
2090 JavaThread* current = JavaThread::current();
2091 int64_t vthread_id = java_lang_Thread::thread_id(current->vthread());
2092 int64_t carrier_id = java_lang_Thread::thread_id(current->threadObj());
2093 log_debug(jni)("VirtualThread (tid: " INT64_FORMAT ", carrier id: " INT64_FORMAT
2094 ") exiting with Objects still locked by JNI MonitorEnter.",
2095 vthread_id, carrier_id);
2096 }
2097 JRT_END
2098
2099 #ifndef PRODUCT
2100
2101 void SharedRuntime::print_statistics() {
2102 ttyLocker ttyl;
2103 if (xtty != nullptr) xtty->head("statistics type='SharedRuntime'");
2104
2105 SharedRuntime::print_ic_miss_histogram_on(tty);
2106 SharedRuntime::print_counters_on(tty);
2107 AdapterHandlerLibrary::print_statistics_on(tty);
2108
2109 if (xtty != nullptr) xtty->tail("statistics");
2110 }
2111
2112 //void SharedRuntime::print_counters_on(outputStream* st) {
2113 // // Dump the JRT_ENTRY counters
2114 // if (_new_instance_ctr) st->print_cr("%5u new instance requires GC", _new_instance_ctr);
2115 // if (_new_array_ctr) st->print_cr("%5u new array requires GC", _new_array_ctr);
2116 // if (_multi2_ctr) st->print_cr("%5u multianewarray 2 dim", _multi2_ctr);
2117 // if (_multi3_ctr) st->print_cr("%5u multianewarray 3 dim", _multi3_ctr);
2118 // if (_multi4_ctr) st->print_cr("%5u multianewarray 4 dim", _multi4_ctr);
2119 // if (_multi5_ctr) st->print_cr("%5u multianewarray 5 dim", _multi5_ctr);
2120 //
2121 // st->print_cr("%5u inline cache miss in compiled", _ic_miss_ctr);
2122 // st->print_cr("%5u wrong method", _wrong_method_ctr);
2123 // st->print_cr("%5u unresolved static call site", _resolve_static_ctr);
2124 // st->print_cr("%5u unresolved virtual call site", _resolve_virtual_ctr);
2125 // st->print_cr("%5u unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2126 //
2127 // if (_mon_enter_stub_ctr) st->print_cr("%5u monitor enter stub", _mon_enter_stub_ctr);
2128 // if (_mon_exit_stub_ctr) st->print_cr("%5u monitor exit stub", _mon_exit_stub_ctr);
2129 // if (_mon_enter_ctr) st->print_cr("%5u monitor enter slow", _mon_enter_ctr);
2130 // if (_mon_exit_ctr) st->print_cr("%5u monitor exit slow", _mon_exit_ctr);
2131 // if (_partial_subtype_ctr) st->print_cr("%5u slow partial subtype", _partial_subtype_ctr);
2132 // if (_jbyte_array_copy_ctr) st->print_cr("%5u byte array copies", _jbyte_array_copy_ctr);
2133 // if (_jshort_array_copy_ctr) st->print_cr("%5u short array copies", _jshort_array_copy_ctr);
2134 // if (_jint_array_copy_ctr) st->print_cr("%5u int array copies", _jint_array_copy_ctr);
2135 // if (_jlong_array_copy_ctr) st->print_cr("%5u long array copies", _jlong_array_copy_ctr);
2136 // if (_oop_array_copy_ctr) st->print_cr("%5u oop array copies", _oop_array_copy_ctr);
2137 // if (_checkcast_array_copy_ctr) st->print_cr("%5u checkcast array copies", _checkcast_array_copy_ctr);
2138 // if (_unsafe_array_copy_ctr) st->print_cr("%5u unsafe array copies", _unsafe_array_copy_ctr);
2139 // if (_generic_array_copy_ctr) st->print_cr("%5u generic array copies", _generic_array_copy_ctr);
2140 // if (_slow_array_copy_ctr) st->print_cr("%5u slow array copies", _slow_array_copy_ctr);
2141 // if (_find_handler_ctr) st->print_cr("%5u find exception handler", _find_handler_ctr);
2142 // if (_rethrow_ctr) st->print_cr("%5u rethrow handler", _rethrow_ctr);
2143 // if (_unsafe_set_memory_ctr) tty->print_cr("%5u unsafe set memorys", _unsafe_set_memory_ctr);
2144 //}
2145
2146 inline double percent(int64_t x, int64_t y) {
2147 return 100.0 * (double)x / (double)MAX2(y, (int64_t)1);
2148 }
2149
2150 class MethodArityHistogram {
2151 public:
2152 enum { MAX_ARITY = 256 };
2153 private:
2154 static uint64_t _arity_histogram[MAX_ARITY]; // histogram of #args
2155 static uint64_t _size_histogram[MAX_ARITY]; // histogram of arg size in words
2156 static uint64_t _total_compiled_calls;
2157 static uint64_t _max_compiled_calls_per_method;
2158 static int _max_arity; // max. arity seen
2159 static int _max_size; // max. arg size seen
2160
2161 static void add_method_to_histogram(nmethod* nm) {
2162 Method* method = (nm == nullptr) ? nullptr : nm->method();
2163 if (method != nullptr) {
2164 ArgumentCount args(method->signature());
2165 int arity = args.size() + (method->is_static() ? 0 : 1);
2166 int argsize = method->size_of_parameters();
2167 arity = MIN2(arity, MAX_ARITY-1);
2168 argsize = MIN2(argsize, MAX_ARITY-1);
2169 uint64_t count = (uint64_t)method->compiled_invocation_count();
2170 _max_compiled_calls_per_method = count > _max_compiled_calls_per_method ? count : _max_compiled_calls_per_method;
2171 _total_compiled_calls += count;
2172 _arity_histogram[arity] += count;
2173 _size_histogram[argsize] += count;
2174 _max_arity = MAX2(_max_arity, arity);
2175 _max_size = MAX2(_max_size, argsize);
2176 }
2177 }
2178
2179 void print_histogram_helper(int n, uint64_t* histo, const char* name) {
2180 const int N = MIN2(9, n);
2181 double sum = 0;
2182 double weighted_sum = 0;
2183 for (int i = 0; i <= n; i++) { sum += (double)histo[i]; weighted_sum += (double)(i*histo[i]); }
2184 if (sum >= 1) { // prevent divide by zero or divide overflow
2185 double rest = sum;
2186 double percent = sum / 100;
2187 for (int i = 0; i <= N; i++) {
2188 rest -= (double)histo[i];
2189 tty->print_cr("%4d: " UINT64_FORMAT_W(12) " (%5.1f%%)", i, histo[i], (double)histo[i] / percent);
2190 }
2191 tty->print_cr("rest: " INT64_FORMAT_W(12) " (%5.1f%%)", (int64_t)rest, rest / percent);
2192 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2193 tty->print_cr("(total # of compiled calls = " INT64_FORMAT_W(14) ")", _total_compiled_calls);
2194 tty->print_cr("(max # of compiled calls = " INT64_FORMAT_W(14) ")", _max_compiled_calls_per_method);
2195 } else {
2196 tty->print_cr("Histogram generation failed for %s. n = %d, sum = %7.5f", name, n, sum);
2197 }
2198 }
2199
2200 void print_histogram() {
2201 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2202 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2203 tty->print_cr("\nHistogram of parameter block size (in words, incl. rcvr):");
2204 print_histogram_helper(_max_size, _size_histogram, "size");
2205 tty->cr();
2206 }
2207
2208 public:
2209 MethodArityHistogram() {
2210 // Take the Compile_lock to protect against changes in the CodeBlob structures
2211 MutexLocker mu1(Compile_lock, Mutex::_safepoint_check_flag);
2212 // Take the CodeCache_lock to protect against changes in the CodeHeap structure
2213 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2214 _max_arity = _max_size = 0;
2215 _total_compiled_calls = 0;
2216 _max_compiled_calls_per_method = 0;
2217 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2218 CodeCache::nmethods_do(add_method_to_histogram);
2219 print_histogram();
2220 }
2221 };
2222
2223 uint64_t MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2224 uint64_t MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2225 uint64_t MethodArityHistogram::_total_compiled_calls;
2226 uint64_t MethodArityHistogram::_max_compiled_calls_per_method;
2227 int MethodArityHistogram::_max_arity;
2228 int MethodArityHistogram::_max_size;
2229
2230 void SharedRuntime::print_call_statistics_on(outputStream* st) {
2231 tty->print_cr("Calls from compiled code:");
2232 int64_t total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2233 int64_t mono_c = _nof_normal_calls - _nof_megamorphic_calls;
2234 int64_t mono_i = _nof_interface_calls;
2235 tty->print_cr("\t" INT64_FORMAT_W(12) " (100%%) total non-inlined ", total);
2236 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2237 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2238 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2239 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2240 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2241 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2242 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2243 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2244 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2245 tty->cr();
2246 tty->print_cr("Note 1: counter updates are not MT-safe.");
2247 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2248 tty->print_cr(" %% in nested categories are relative to their category");
2249 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2250 tty->cr();
2251
2252 MethodArityHistogram h;
2253 }
2254 #endif
2255
2256 #ifndef PRODUCT
2257 static int _lookups; // number of calls to lookup
2258 static int _equals; // number of buckets checked with matching hash
2259 static int _hits; // number of successful lookups
2260 static int _compact; // number of equals calls with compact signature
2261 #endif
2262
2263 // A simple wrapper class around the calling convention information
2264 // that allows sharing of adapters for the same calling convention.
2265 class AdapterFingerPrint : public CHeapObj<mtCode> {
2266 private:
2267 enum {
2268 _basic_type_bits = 4,
2269 _basic_type_mask = right_n_bits(_basic_type_bits),
2270 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2271 _compact_int_count = 3
2272 };
2273 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2274 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2275
2276 union {
2277 int _compact[_compact_int_count];
2278 int* _fingerprint;
2279 } _value;
2280 int _length; // A negative length indicates the fingerprint is in the compact form,
2281 // Otherwise _value._fingerprint is the array.
2282
2283 // Remap BasicTypes that are handled equivalently by the adapters.
2284 // These are correct for the current system but someday it might be
2285 // necessary to make this mapping platform dependent.
2286 static int adapter_encoding(BasicType in) {
2287 switch (in) {
2288 case T_BOOLEAN:
2289 case T_BYTE:
2290 case T_SHORT:
2291 case T_CHAR:
2292 // There are all promoted to T_INT in the calling convention
2293 return T_INT;
2294
2295 case T_OBJECT:
2296 case T_ARRAY:
2297 // In other words, we assume that any register good enough for
2298 // an int or long is good enough for a managed pointer.
2299 #ifdef _LP64
2300 return T_LONG;
2301 #else
2302 return T_INT;
2303 #endif
2304
2305 case T_INT:
2306 case T_LONG:
2307 case T_FLOAT:
2308 case T_DOUBLE:
2309 case T_VOID:
2310 return in;
2311
2312 default:
2313 ShouldNotReachHere();
2314 return T_CONFLICT;
2315 }
2316 }
2317
2318 public:
2319 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2320 // The fingerprint is based on the BasicType signature encoded
2321 // into an array of ints with eight entries per int.
2322 int* ptr;
2323 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2324 if (len <= _compact_int_count) {
2325 assert(_compact_int_count == 3, "else change next line");
2326 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2327 // Storing the signature encoded as signed chars hits about 98%
2328 // of the time.
2329 _length = -len;
2330 ptr = _value._compact;
2331 } else {
2332 _length = len;
2333 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2334 ptr = _value._fingerprint;
2335 }
2336
2337 // Now pack the BasicTypes with 8 per int
2338 int sig_index = 0;
2339 for (int index = 0; index < len; index++) {
2340 int value = 0;
2341 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2342 int bt = adapter_encoding(sig_bt[sig_index++]);
2343 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2344 value = (value << _basic_type_bits) | bt;
2345 }
2346 ptr[index] = value;
2347 }
2348 }
2349
2350 ~AdapterFingerPrint() {
2351 if (_length > 0) {
2352 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2353 }
2354 }
2355
2356 int value(int index) {
2357 if (_length < 0) {
2358 return _value._compact[index];
2359 }
2360 return _value._fingerprint[index];
2361 }
2362 int length() {
2363 if (_length < 0) return -_length;
2364 return _length;
2365 }
2366
2367 bool is_compact() {
2368 return _length <= 0;
2369 }
2370
2371 unsigned int compute_hash() {
2372 int hash = 0;
2373 for (int i = 0; i < length(); i++) {
2374 int v = value(i);
2375 hash = (hash << 8) ^ v ^ (hash >> 5);
2376 }
2377 return (unsigned int)hash;
2378 }
2379
2380 const char* as_string() {
2381 stringStream st;
2382 st.print("0x");
2383 for (int i = 0; i < length(); i++) {
2384 st.print("%x", value(i));
2385 }
2386 return st.as_string();
2387 }
2388
2389 #ifndef PRODUCT
2390 // Reconstitutes the basic type arguments from the fingerprint,
2391 // producing strings like LIJDF
2392 const char* as_basic_args_string() {
2393 stringStream st;
2394 bool long_prev = false;
2395 for (int i = 0; i < length(); i++) {
2396 unsigned val = (unsigned)value(i);
2397 // args are packed so that first/lower arguments are in the highest
2398 // bits of each int value, so iterate from highest to the lowest
2399 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2400 unsigned v = (val >> j) & _basic_type_mask;
2401 if (v == 0) {
2402 assert(i == length() - 1, "Only expect zeroes in the last word");
2403 continue;
2404 }
2405 if (long_prev) {
2406 long_prev = false;
2407 if (v == T_VOID) {
2408 st.print("J");
2409 } else {
2410 st.print("L");
2411 }
2412 }
2413 switch (v) {
2414 case T_INT: st.print("I"); break;
2415 case T_LONG: long_prev = true; break;
2416 case T_FLOAT: st.print("F"); break;
2417 case T_DOUBLE: st.print("D"); break;
2418 case T_VOID: break;
2419 default: ShouldNotReachHere();
2420 }
2421 }
2422 }
2423 if (long_prev) {
2424 st.print("L");
2425 }
2426 return st.as_string();
2427 }
2428 #endif // !product
2429
2430 bool equals(AdapterFingerPrint* other) {
2431 if (other->_length != _length) {
2432 return false;
2433 }
2434 if (_length < 0) {
2435 assert(_compact_int_count == 3, "else change next line");
2436 return _value._compact[0] == other->_value._compact[0] &&
2437 _value._compact[1] == other->_value._compact[1] &&
2438 _value._compact[2] == other->_value._compact[2];
2439 } else {
2440 for (int i = 0; i < _length; i++) {
2441 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2442 return false;
2443 }
2444 }
2445 }
2446 return true;
2447 }
2448
2449 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2450 NOT_PRODUCT(_equals++);
2451 return fp1->equals(fp2);
2452 }
2453
2454 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2455 return fp->compute_hash();
2456 }
2457 };
2458
2459 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2460 using AdapterHandlerTable = ResourceHashtable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2461 AnyObj::C_HEAP, mtCode,
2462 AdapterFingerPrint::compute_hash,
2463 AdapterFingerPrint::equals>;
2464 static AdapterHandlerTable* _adapter_handler_table;
2465
2466 // Find a entry with the same fingerprint if it exists
2467 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2468 NOT_PRODUCT(_lookups++);
2469 assert_lock_strong(AdapterHandlerLibrary_lock);
2470 AdapterFingerPrint fp(total_args_passed, sig_bt);
2471 AdapterHandlerEntry** entry = _adapter_handler_table->get(&fp);
2472 if (entry != nullptr) {
2473 #ifndef PRODUCT
2474 if (fp.is_compact()) _compact++;
2475 _hits++;
2476 #endif
2477 return *entry;
2478 }
2479 return nullptr;
2480 }
2481
2482 #ifndef PRODUCT
2483 void AdapterHandlerLibrary::print_statistics_on(outputStream* st) {
2484 auto size = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2485 return sizeof(*key) + sizeof(*a);
2486 };
2487 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2488 ts.print(st, "AdapterHandlerTable");
2489 st->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2490 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2491 st->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d compact %d",
2492 _lookups, _equals, _hits, _compact);
2493 }
2494 #endif // !PRODUCT
2495
2496 // ---------------------------------------------------------------------------
2497 // Implementation of AdapterHandlerLibrary
2498 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = nullptr;
2499 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2500 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2501 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2502 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2503 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2504 const int AdapterHandlerLibrary_size = 16*K;
2505 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2506
2507 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2508 return _buffer;
2509 }
2510
2511 static void post_adapter_creation(const AdapterBlob* new_adapter,
2512 const AdapterHandlerEntry* entry) {
2513 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2514 char blob_id[256];
2515 jio_snprintf(blob_id,
2516 sizeof(blob_id),
2517 "%s(%s)",
2518 new_adapter->name(),
2519 entry->fingerprint()->as_string());
2520 if (Forte::is_enabled()) {
2521 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2522 }
2523
2524 if (JvmtiExport::should_post_dynamic_code_generated()) {
2525 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2526 }
2527 }
2528 }
2529
2530 void AdapterHandlerLibrary::initialize() {
2531 ResourceMark rm;
2532 AdapterBlob* no_arg_blob = nullptr;
2533 AdapterBlob* int_arg_blob = nullptr;
2534 AdapterBlob* obj_arg_blob = nullptr;
2535 AdapterBlob* obj_int_arg_blob = nullptr;
2536 AdapterBlob* obj_obj_arg_blob = nullptr;
2537 {
2538 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2539 MutexLocker mu(AdapterHandlerLibrary_lock);
2540
2541 // Create a special handler for abstract methods. Abstract methods
2542 // are never compiled so an i2c entry is somewhat meaningless, but
2543 // throw AbstractMethodError just in case.
2544 // Pass wrong_method_abstract for the c2i transitions to return
2545 // AbstractMethodError for invalid invocations.
2546 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2547 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, nullptr),
2548 SharedRuntime::throw_AbstractMethodError_entry(),
2549 wrong_method_abstract, wrong_method_abstract);
2550
2551 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2552 _no_arg_handler = create_adapter(no_arg_blob, 0, nullptr, true);
2553
2554 BasicType obj_args[] = { T_OBJECT };
2555 _obj_arg_handler = create_adapter(obj_arg_blob, 1, obj_args, true);
2556
2557 BasicType int_args[] = { T_INT };
2558 _int_arg_handler = create_adapter(int_arg_blob, 1, int_args, true);
2559
2560 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2561 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, 2, obj_int_args, true);
2562
2563 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2564 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, 2, obj_obj_args, true);
2565
2566 assert(no_arg_blob != nullptr &&
2567 obj_arg_blob != nullptr &&
2568 int_arg_blob != nullptr &&
2569 obj_int_arg_blob != nullptr &&
2570 obj_obj_arg_blob != nullptr, "Initial adapters must be properly created");
2571 }
2572
2573 // Outside of the lock
2574 post_adapter_creation(no_arg_blob, _no_arg_handler);
2575 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2576 post_adapter_creation(int_arg_blob, _int_arg_handler);
2577 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2578 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2579 }
2580
2581 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2582 address i2c_entry,
2583 address c2i_entry,
2584 address c2i_unverified_entry,
2585 address c2i_no_clinit_check_entry) {
2586 // Insert an entry into the table
2587 return new AdapterHandlerEntry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry,
2588 c2i_no_clinit_check_entry);
2589 }
2590
2591 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2592 if (method->is_abstract()) {
2593 return _abstract_method_handler;
2594 }
2595 int total_args_passed = method->size_of_parameters(); // All args on stack
2596 if (total_args_passed == 0) {
2597 return _no_arg_handler;
2598 } else if (total_args_passed == 1) {
2599 if (!method->is_static()) {
2600 return _obj_arg_handler;
2601 }
2602 switch (method->signature()->char_at(1)) {
2603 case JVM_SIGNATURE_CLASS:
2604 case JVM_SIGNATURE_ARRAY:
2605 return _obj_arg_handler;
2606 case JVM_SIGNATURE_INT:
2607 case JVM_SIGNATURE_BOOLEAN:
2608 case JVM_SIGNATURE_CHAR:
2609 case JVM_SIGNATURE_BYTE:
2610 case JVM_SIGNATURE_SHORT:
2611 return _int_arg_handler;
2612 }
2613 } else if (total_args_passed == 2 &&
2614 !method->is_static()) {
2615 switch (method->signature()->char_at(1)) {
2616 case JVM_SIGNATURE_CLASS:
2617 case JVM_SIGNATURE_ARRAY:
2618 return _obj_obj_arg_handler;
2619 case JVM_SIGNATURE_INT:
2620 case JVM_SIGNATURE_BOOLEAN:
2621 case JVM_SIGNATURE_CHAR:
2622 case JVM_SIGNATURE_BYTE:
2623 case JVM_SIGNATURE_SHORT:
2624 return _obj_int_arg_handler;
2625 }
2626 }
2627 return nullptr;
2628 }
2629
2630 class AdapterSignatureIterator : public SignatureIterator {
2631 private:
2632 BasicType stack_sig_bt[16];
2633 BasicType* sig_bt;
2634 int index;
2635
2636 public:
2637 AdapterSignatureIterator(Symbol* signature,
2638 fingerprint_t fingerprint,
2639 bool is_static,
2640 int total_args_passed) :
2641 SignatureIterator(signature, fingerprint),
2642 index(0)
2643 {
2644 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2645 if (!is_static) { // Pass in receiver first
2646 sig_bt[index++] = T_OBJECT;
2647 }
2648 do_parameters_on(this);
2649 }
2650
2651 BasicType* basic_types() {
2652 return sig_bt;
2653 }
2654
2655 #ifdef ASSERT
2656 int slots() {
2657 return index;
2658 }
2659 #endif
2660
2661 private:
2662
2663 friend class SignatureIterator; // so do_parameters_on can call do_type
2664 void do_type(BasicType type) {
2665 sig_bt[index++] = type;
2666 if (type == T_LONG || type == T_DOUBLE) {
2667 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2668 }
2669 }
2670 };
2671
2672 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2673 // Use customized signature handler. Need to lock around updates to
2674 // the _adapter_handler_table (it is not safe for concurrent readers
2675 // and a single writer: this could be fixed if it becomes a
2676 // problem).
2677
2678 // Fast-path for trivial adapters
2679 AdapterHandlerEntry* entry = get_simple_adapter(method);
2680 if (entry != nullptr) {
2681 return entry;
2682 }
2683
2684 ResourceMark rm;
2685 AdapterBlob* new_adapter = nullptr;
2686
2687 // Fill in the signature array, for the calling-convention call.
2688 int total_args_passed = method->size_of_parameters(); // All args on stack
2689
2690 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2691 method->is_static(), total_args_passed);
2692 assert(si.slots() == total_args_passed, "");
2693 BasicType* sig_bt = si.basic_types();
2694 {
2695 MutexLocker mu(AdapterHandlerLibrary_lock);
2696
2697 // Lookup method signature's fingerprint
2698 entry = lookup(total_args_passed, sig_bt);
2699
2700 if (entry != nullptr) {
2701 #ifdef ASSERT
2702 if (VerifyAdapterSharing) {
2703 AdapterBlob* comparison_blob = nullptr;
2704 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, total_args_passed, sig_bt, false);
2705 assert(comparison_blob == nullptr, "no blob should be created when creating an adapter for comparison");
2706 assert(comparison_entry->compare_code(entry), "code must match");
2707 // Release the one just created and return the original
2708 delete comparison_entry;
2709 }
2710 #endif
2711 return entry;
2712 }
2713
2714 entry = create_adapter(new_adapter, total_args_passed, sig_bt, /* allocate_code_blob */ true);
2715 }
2716
2717 // Outside of the lock
2718 if (new_adapter != nullptr) {
2719 post_adapter_creation(new_adapter, entry);
2720 }
2721 return entry;
2722 }
2723
2724 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& new_adapter,
2725 int total_args_passed,
2726 BasicType* sig_bt,
2727 bool allocate_code_blob) {
2728 if (log_is_enabled(Info, perf, class, link)) {
2729 ClassLoader::perf_method_adapters_count()->inc();
2730 }
2731
2732 // StubRoutines::_final_stubs_code is initialized after this function can be called. As a result,
2733 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated prior
2734 // to all StubRoutines::_final_stubs_code being set. Checks refer to runtime range checks generated
2735 // in an I2C stub that ensure that an I2C stub is called from an interpreter frame or stubs.
2736 bool contains_all_checks = StubRoutines::final_stubs_code() != nullptr;
2737
2738 VMRegPair stack_regs[16];
2739 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2740
2741 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2742 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2743 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2744 CodeBuffer buffer(buf);
2745 short buffer_locs[20];
2746 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2747 sizeof(buffer_locs)/sizeof(relocInfo));
2748
2749 // Make a C heap allocated version of the fingerprint to store in the adapter
2750 AdapterFingerPrint* fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2751 MacroAssembler _masm(&buffer);
2752 AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2753 total_args_passed,
2754 comp_args_on_stack,
2755 sig_bt,
2756 regs,
2757 fingerprint);
2758
2759 #ifdef ASSERT
2760 if (VerifyAdapterSharing) {
2761 entry->save_code(buf->code_begin(), buffer.insts_size());
2762 if (!allocate_code_blob) {
2763 return entry;
2764 }
2765 }
2766 #endif
2767
2768 new_adapter = AdapterBlob::create(&buffer);
2769 NOT_PRODUCT(int insts_size = buffer.insts_size());
2770 if (new_adapter == nullptr) {
2771 // CodeCache is full, disable compilation
2772 // Ought to log this but compile log is only per compile thread
2773 // and we're some non descript Java thread.
2774 return nullptr;
2775 }
2776 entry->relocate(new_adapter->content_begin());
2777 #ifndef PRODUCT
2778 // debugging support
2779 if (PrintAdapterHandlers || PrintStubCode) {
2780 ttyLocker ttyl;
2781 entry->print_adapter_on(tty);
2782 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2783 _adapter_handler_table->number_of_entries(), fingerprint->as_basic_args_string(),
2784 fingerprint->as_string(), insts_size);
2785 tty->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(entry->get_c2i_entry()));
2786 if (Verbose || PrintStubCode) {
2787 address first_pc = entry->base_address();
2788 if (first_pc != nullptr) {
2789 Disassembler::decode(first_pc, first_pc + insts_size, tty
2790 NOT_PRODUCT(COMMA &new_adapter->asm_remarks()));
2791 tty->cr();
2792 }
2793 }
2794 }
2795 #endif
2796
2797 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2798 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2799 if (contains_all_checks || !VerifyAdapterCalls) {
2800 assert_lock_strong(AdapterHandlerLibrary_lock);
2801 _adapter_handler_table->put(fingerprint, entry);
2802 }
2803 return entry;
2804 }
2805
2806 address AdapterHandlerEntry::base_address() {
2807 address base = _i2c_entry;
2808 if (base == nullptr) base = _c2i_entry;
2809 assert(base <= _c2i_entry || _c2i_entry == nullptr, "");
2810 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == nullptr, "");
2811 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == nullptr, "");
2812 return base;
2813 }
2814
2815 void AdapterHandlerEntry::relocate(address new_base) {
2816 address old_base = base_address();
2817 assert(old_base != nullptr, "");
2818 ptrdiff_t delta = new_base - old_base;
2819 if (_i2c_entry != nullptr)
2820 _i2c_entry += delta;
2821 if (_c2i_entry != nullptr)
2822 _c2i_entry += delta;
2823 if (_c2i_unverified_entry != nullptr)
2824 _c2i_unverified_entry += delta;
2825 if (_c2i_no_clinit_check_entry != nullptr)
2826 _c2i_no_clinit_check_entry += delta;
2827 assert(base_address() == new_base, "");
2828 }
2829
2830
2831 AdapterHandlerEntry::~AdapterHandlerEntry() {
2832 delete _fingerprint;
2833 #ifdef ASSERT
2834 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2835 #endif
2836 }
2837
2838
2839 #ifdef ASSERT
2840 // Capture the code before relocation so that it can be compared
2841 // against other versions. If the code is captured after relocation
2842 // then relative instructions won't be equivalent.
2843 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2844 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2845 _saved_code_length = length;
2846 memcpy(_saved_code, buffer, length);
2847 }
2848
2849
2850 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
2851 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
2852
2853 if (other->_saved_code_length != _saved_code_length) {
2854 return false;
2855 }
2856
2857 return memcmp(other->_saved_code, _saved_code, _saved_code_length) == 0;
2858 }
2859 #endif
2860
2861
2862 /**
2863 * Create a native wrapper for this native method. The wrapper converts the
2864 * Java-compiled calling convention to the native convention, handles
2865 * arguments, and transitions to native. On return from the native we transition
2866 * back to java blocking if a safepoint is in progress.
2867 */
2868 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2869 ResourceMark rm;
2870 nmethod* nm = nullptr;
2871
2872 // Check if memory should be freed before allocation
2873 CodeCache::gc_on_allocation();
2874
2875 assert(method->is_native(), "must be native");
2876 assert(method->is_special_native_intrinsic() ||
2877 method->has_native_function(), "must have something valid to call!");
2878
2879 {
2880 // Perform the work while holding the lock, but perform any printing outside the lock
2881 MutexLocker mu(AdapterHandlerLibrary_lock);
2882 // See if somebody beat us to it
2883 if (method->code() != nullptr) {
2884 return;
2885 }
2886
2887 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2888 assert(compile_id > 0, "Must generate native wrapper");
2889
2890
2891 ResourceMark rm;
2892 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2893 if (buf != nullptr) {
2894 CodeBuffer buffer(buf);
2895
2896 if (method->is_continuation_enter_intrinsic()) {
2897 buffer.initialize_stubs_size(192);
2898 }
2899
2900 struct { double data[20]; } locs_buf;
2901 struct { double data[20]; } stubs_locs_buf;
2902 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2903 #if defined(AARCH64) || defined(PPC64)
2904 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
2905 // in the constant pool to ensure ordering between the barrier and oops
2906 // accesses. For native_wrappers we need a constant.
2907 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
2908 // static java call that is resolved in the runtime.
2909 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
2910 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
2911 }
2912 #endif
2913 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
2914 MacroAssembler _masm(&buffer);
2915
2916 // Fill in the signature array, for the calling-convention call.
2917 const int total_args_passed = method->size_of_parameters();
2918
2919 VMRegPair stack_regs[16];
2920 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2921
2922 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2923 method->is_static(), total_args_passed);
2924 BasicType* sig_bt = si.basic_types();
2925 assert(si.slots() == total_args_passed, "");
2926 BasicType ret_type = si.return_type();
2927
2928 // Now get the compiled-Java arguments layout.
2929 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2930
2931 // Generate the compiled-to-native wrapper code
2932 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2933
2934 if (nm != nullptr) {
2935 {
2936 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
2937 if (nm->make_in_use()) {
2938 method->set_code(method, nm);
2939 }
2940 }
2941
2942 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
2943 if (directive->PrintAssemblyOption) {
2944 nm->print_code();
2945 }
2946 DirectivesStack::release(directive);
2947 }
2948 }
2949 } // Unlock AdapterHandlerLibrary_lock
2950
2951
2952 // Install the generated code.
2953 if (nm != nullptr) {
2954 const char *msg = method->is_static() ? "(static)" : "";
2955 CompileTask::print_ul(nm, msg);
2956 if (PrintCompilation) {
2957 ttyLocker ttyl;
2958 CompileTask::print(tty, nm, msg);
2959 }
2960 nm->post_compiled_method_load_event();
2961 }
2962 }
2963
2964 // -------------------------------------------------------------------------
2965 // Java-Java calling convention
2966 // (what you use when Java calls Java)
2967
2968 //------------------------------name_for_receiver----------------------------------
2969 // For a given signature, return the VMReg for parameter 0.
2970 VMReg SharedRuntime::name_for_receiver() {
2971 VMRegPair regs;
2972 BasicType sig_bt = T_OBJECT;
2973 (void) java_calling_convention(&sig_bt, ®s, 1);
2974 // Return argument 0 register. In the LP64 build pointers
2975 // take 2 registers, but the VM wants only the 'main' name.
2976 return regs.first();
2977 }
2978
2979 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2980 // This method is returning a data structure allocating as a
2981 // ResourceObject, so do not put any ResourceMarks in here.
2982
2983 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2984 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2985 int cnt = 0;
2986 if (has_receiver) {
2987 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2988 }
2989
2990 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
2991 BasicType type = ss.type();
2992 sig_bt[cnt++] = type;
2993 if (is_double_word_type(type))
2994 sig_bt[cnt++] = T_VOID;
2995 }
2996
2997 if (has_appendix) {
2998 sig_bt[cnt++] = T_OBJECT;
2999 }
3000
3001 assert(cnt < 256, "grow table size");
3002
3003 int comp_args_on_stack;
3004 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt);
3005
3006 // the calling convention doesn't count out_preserve_stack_slots so
3007 // we must add that in to get "true" stack offsets.
3008
3009 if (comp_args_on_stack) {
3010 for (int i = 0; i < cnt; i++) {
3011 VMReg reg1 = regs[i].first();
3012 if (reg1->is_stack()) {
3013 // Yuck
3014 reg1 = reg1->bias(out_preserve_stack_slots());
3015 }
3016 VMReg reg2 = regs[i].second();
3017 if (reg2->is_stack()) {
3018 // Yuck
3019 reg2 = reg2->bias(out_preserve_stack_slots());
3020 }
3021 regs[i].set_pair(reg2, reg1);
3022 }
3023 }
3024
3025 // results
3026 *arg_size = cnt;
3027 return regs;
3028 }
3029
3030 // OSR Migration Code
3031 //
3032 // This code is used convert interpreter frames into compiled frames. It is
3033 // called from very start of a compiled OSR nmethod. A temp array is
3034 // allocated to hold the interesting bits of the interpreter frame. All
3035 // active locks are inflated to allow them to move. The displaced headers and
3036 // active interpreter locals are copied into the temp buffer. Then we return
3037 // back to the compiled code. The compiled code then pops the current
3038 // interpreter frame off the stack and pushes a new compiled frame. Then it
3039 // copies the interpreter locals and displaced headers where it wants.
3040 // Finally it calls back to free the temp buffer.
3041 //
3042 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3043
3044 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *current) )
3045 assert(current == JavaThread::current(), "pre-condition");
3046
3047 // During OSR migration, we unwind the interpreted frame and replace it with a compiled
3048 // frame. The stack watermark code below ensures that the interpreted frame is processed
3049 // before it gets unwound. This is helpful as the size of the compiled frame could be
3050 // larger than the interpreted frame, which could result in the new frame not being
3051 // processed correctly.
3052 StackWatermarkSet::before_unwind(current);
3053
3054 //
3055 // This code is dependent on the memory layout of the interpreter local
3056 // array and the monitors. On all of our platforms the layout is identical
3057 // so this code is shared. If some platform lays the their arrays out
3058 // differently then this code could move to platform specific code or
3059 // the code here could be modified to copy items one at a time using
3060 // frame accessor methods and be platform independent.
3061
3062 frame fr = current->last_frame();
3063 assert(fr.is_interpreted_frame(), "");
3064 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3065
3066 // Figure out how many monitors are active.
3067 int active_monitor_count = 0;
3068 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3069 kptr < fr.interpreter_frame_monitor_begin();
3070 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3071 if (kptr->obj() != nullptr) active_monitor_count++;
3072 }
3073
3074 // QQQ we could place number of active monitors in the array so that compiled code
3075 // could double check it.
3076
3077 Method* moop = fr.interpreter_frame_method();
3078 int max_locals = moop->max_locals();
3079 // Allocate temp buffer, 1 word per local & 2 per active monitor
3080 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3081 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3082
3083 // Copy the locals. Order is preserved so that loading of longs works.
3084 // Since there's no GC I can copy the oops blindly.
3085 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3086 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3087 (HeapWord*)&buf[0],
3088 max_locals);
3089
3090 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3091 int i = max_locals;
3092 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3093 kptr2 < fr.interpreter_frame_monitor_begin();
3094 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3095 if (kptr2->obj() != nullptr) { // Avoid 'holes' in the monitor array
3096 BasicLock *lock = kptr2->lock();
3097 if (LockingMode == LM_LEGACY) {
3098 // Inflate so the object's header no longer refers to the BasicLock.
3099 if (lock->displaced_header().is_unlocked()) {
3100 // The object is locked and the resulting ObjectMonitor* will also be
3101 // locked so it can't be async deflated until ownership is dropped.
3102 // See the big comment in basicLock.cpp: BasicLock::move_to().
3103 ObjectSynchronizer::inflate_helper(kptr2->obj());
3104 }
3105 // Now the displaced header is free to move because the
3106 // object's header no longer refers to it.
3107 buf[i] = (intptr_t)lock->displaced_header().value();
3108 } else if (UseObjectMonitorTable) {
3109 buf[i] = (intptr_t)lock->object_monitor_cache();
3110 }
3111 #ifdef ASSERT
3112 else {
3113 buf[i] = badDispHeaderOSR;
3114 }
3115 #endif
3116 i++;
3117 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3118 }
3119 }
3120 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3121
3122 RegisterMap map(current,
3123 RegisterMap::UpdateMap::skip,
3124 RegisterMap::ProcessFrames::include,
3125 RegisterMap::WalkContinuation::skip);
3126 frame sender = fr.sender(&map);
3127 if (sender.is_interpreted_frame()) {
3128 current->push_cont_fastpath(sender.sp());
3129 }
3130
3131 return buf;
3132 JRT_END
3133
3134 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3135 FREE_C_HEAP_ARRAY(intptr_t, buf);
3136 JRT_END
3137
3138 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3139 bool found = false;
3140 auto findblob = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3141 return (found = (b == CodeCache::find_blob(a->get_i2c_entry())));
3142 };
3143 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3144 _adapter_handler_table->iterate(findblob);
3145 return found;
3146 }
3147
3148 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3149 bool found = false;
3150 auto findblob = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3151 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3152 found = true;
3153 st->print("Adapter for signature: ");
3154 a->print_adapter_on(st);
3155 return true;
3156 } else {
3157 return false; // keep looking
3158 }
3159 };
3160 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3161 _adapter_handler_table->iterate(findblob);
3162 assert(found, "Should have found handler");
3163 }
3164
3165 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3166 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3167 if (get_i2c_entry() != nullptr) {
3168 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3169 }
3170 if (get_c2i_entry() != nullptr) {
3171 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3172 }
3173 if (get_c2i_unverified_entry() != nullptr) {
3174 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3175 }
3176 if (get_c2i_no_clinit_check_entry() != nullptr) {
3177 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3178 }
3179 st->cr();
3180 }
3181
3182 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3183 assert(current == JavaThread::current(), "pre-condition");
3184 StackOverflow* overflow_state = current->stack_overflow_state();
3185 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3186 overflow_state->set_reserved_stack_activation(current->stack_base());
3187 JRT_END
3188
3189 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* current, frame fr) {
3190 ResourceMark rm(current);
3191 frame activation;
3192 nmethod* nm = nullptr;
3193 int count = 1;
3194
3195 assert(fr.is_java_frame(), "Must start on Java frame");
3196
3197 RegisterMap map(JavaThread::current(),
3198 RegisterMap::UpdateMap::skip,
3199 RegisterMap::ProcessFrames::skip,
3200 RegisterMap::WalkContinuation::skip); // don't walk continuations
3201 for (; !fr.is_first_frame(); fr = fr.sender(&map)) {
3202 if (!fr.is_java_frame()) {
3203 continue;
3204 }
3205
3206 Method* method = nullptr;
3207 bool found = false;
3208 if (fr.is_interpreted_frame()) {
3209 method = fr.interpreter_frame_method();
3210 if (method != nullptr && method->has_reserved_stack_access()) {
3211 found = true;
3212 }
3213 } else {
3214 CodeBlob* cb = fr.cb();
3215 if (cb != nullptr && cb->is_nmethod()) {
3216 nm = cb->as_nmethod();
3217 method = nm->method();
3218 // scope_desc_near() must be used, instead of scope_desc_at() because on
3219 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3220 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != nullptr; sd = sd->sender()) {
3221 method = sd->method();
3222 if (method != nullptr && method->has_reserved_stack_access()) {
3223 found = true;
3224 }
3225 }
3226 }
3227 }
3228 if (found) {
3229 activation = fr;
3230 warning("Potentially dangerous stack overflow in "
3231 "ReservedStackAccess annotated method %s [%d]",
3232 method->name_and_sig_as_C_string(), count++);
3233 EventReservedStackActivation event;
3234 if (event.should_commit()) {
3235 event.set_method(method);
3236 event.commit();
3237 }
3238 }
3239 }
3240 return activation;
3241 }
3242
3243 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3244 // After any safepoint, just before going back to compiled code,
3245 // we inform the GC that we will be doing initializing writes to
3246 // this object in the future without emitting card-marks, so
3247 // GC may take any compensating steps.
3248
3249 oop new_obj = current->vm_result();
3250 if (new_obj == nullptr) return;
3251
3252 BarrierSet *bs = BarrierSet::barrier_set();
3253 bs->on_slowpath_allocation_exit(current, new_obj);
3254 }