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