1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/archiveBuilder.hpp"
26 #include "cds/archiveUtils.inline.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/aotCodeCache.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/compiledIC.hpp"
35 #include "code/nmethod.inline.hpp"
36 #include "code/scopeDesc.hpp"
37 #include "code/vtableStubs.hpp"
38 #include "compiler/abstractCompiler.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "gc/shared/barrierSet.hpp"
42 #include "gc/shared/collectedHeap.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "interpreter/interpreterRuntime.hpp"
45 #include "jvm.h"
46 #include "jfr/jfrEvents.hpp"
47 #include "logging/log.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "metaprogramming/primitiveConversions.hpp"
51 #include "oops/klass.hpp"
52 #include "oops/method.inline.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "prims/forte.hpp"
56 #include "prims/jvmtiExport.hpp"
57 #include "prims/jvmtiThreadState.hpp"
58 #include "prims/methodHandles.hpp"
59 #include "prims/nativeLookup.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/basicLock.inline.hpp"
63 #include "runtime/frame.inline.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/init.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/stackWatermarkSet.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/synchronizer.inline.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vframe.inline.hpp"
77 #include "runtime/vframeArray.hpp"
78 #include "runtime/vm_version.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.inline.hpp"
91 #endif
92
93 // Shared runtime stub routines reside in their own unique blob with a
94 // single entry point
95
96
97 #define SHARED_STUB_FIELD_DEFINE(name, type) \
98 type SharedRuntime::BLOB_FIELD_NAME(name);
99 SHARED_STUBS_DO(SHARED_STUB_FIELD_DEFINE)
100 #undef SHARED_STUB_FIELD_DEFINE
101
102 #define SHARED_STUB_NAME_DECLARE(name, type) "Shared Runtime " # name "_blob",
103 const char *SharedRuntime::_stub_names[] = {
104 SHARED_STUBS_DO(SHARED_STUB_NAME_DECLARE)
105 };
106
107 //----------------------------generate_stubs-----------------------------------
108 void SharedRuntime::generate_initial_stubs() {
109 // Build this early so it's available for the interpreter.
110 _throw_StackOverflowError_blob =
111 generate_throw_exception(SharedStubId::throw_StackOverflowError_id,
112 CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError));
113 }
114
115 void SharedRuntime::generate_stubs() {
116 _wrong_method_blob =
117 generate_resolve_blob(SharedStubId::wrong_method_id,
118 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method));
119 _wrong_method_abstract_blob =
120 generate_resolve_blob(SharedStubId::wrong_method_abstract_id,
121 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract));
122 _ic_miss_blob =
123 generate_resolve_blob(SharedStubId::ic_miss_id,
124 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss));
125 _resolve_opt_virtual_call_blob =
126 generate_resolve_blob(SharedStubId::resolve_opt_virtual_call_id,
127 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C));
128 _resolve_virtual_call_blob =
129 generate_resolve_blob(SharedStubId::resolve_virtual_call_id,
130 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C));
131 _resolve_static_call_blob =
132 generate_resolve_blob(SharedStubId::resolve_static_call_id,
133 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C));
134
135 _throw_delayed_StackOverflowError_blob =
136 generate_throw_exception(SharedStubId::throw_delayed_StackOverflowError_id,
137 CAST_FROM_FN_PTR(address, SharedRuntime::throw_delayed_StackOverflowError));
138
139 _throw_AbstractMethodError_blob =
140 generate_throw_exception(SharedStubId::throw_AbstractMethodError_id,
141 CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError));
142
143 _throw_IncompatibleClassChangeError_blob =
144 generate_throw_exception(SharedStubId::throw_IncompatibleClassChangeError_id,
145 CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError));
146
147 _throw_NullPointerException_at_call_blob =
148 generate_throw_exception(SharedStubId::throw_NullPointerException_at_call_id,
149 CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call));
150
151 #if COMPILER2_OR_JVMCI
152 // Vectors are generated only by C2 and JVMCI.
153 bool support_wide = is_wide_vector(MaxVectorSize);
154 if (support_wide) {
155 _polling_page_vectors_safepoint_handler_blob =
156 generate_handler_blob(SharedStubId::polling_page_vectors_safepoint_handler_id,
157 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
158 }
159 #endif // COMPILER2_OR_JVMCI
160 _polling_page_safepoint_handler_blob =
161 generate_handler_blob(SharedStubId::polling_page_safepoint_handler_id,
162 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
163 _polling_page_return_handler_blob =
164 generate_handler_blob(SharedStubId::polling_page_return_handler_id,
165 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
166
167 generate_deopt_blob();
168 }
169
170 void SharedRuntime::init_adapter_library() {
171 AdapterHandlerLibrary::initialize();
172 }
173
174 #if INCLUDE_JFR
175 //------------------------------generate jfr runtime stubs ------
176 void SharedRuntime::generate_jfr_stubs() {
177 ResourceMark rm;
178 const char* timer_msg = "SharedRuntime generate_jfr_stubs";
179 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
180
181 _jfr_write_checkpoint_blob = generate_jfr_write_checkpoint();
182 _jfr_return_lease_blob = generate_jfr_return_lease();
183 }
184
185 #endif // INCLUDE_JFR
186
187 #include <math.h>
188
189 // Implementation of SharedRuntime
190
191 #ifndef PRODUCT
192 // For statistics
193 uint SharedRuntime::_ic_miss_ctr = 0;
194 uint SharedRuntime::_wrong_method_ctr = 0;
195 uint SharedRuntime::_resolve_static_ctr = 0;
196 uint SharedRuntime::_resolve_virtual_ctr = 0;
197 uint SharedRuntime::_resolve_opt_virtual_ctr = 0;
198 uint SharedRuntime::_implicit_null_throws = 0;
199 uint SharedRuntime::_implicit_div0_throws = 0;
200
201 int64_t SharedRuntime::_nof_normal_calls = 0;
202 int64_t SharedRuntime::_nof_inlined_calls = 0;
203 int64_t SharedRuntime::_nof_megamorphic_calls = 0;
204 int64_t SharedRuntime::_nof_static_calls = 0;
205 int64_t SharedRuntime::_nof_inlined_static_calls = 0;
206 int64_t SharedRuntime::_nof_interface_calls = 0;
207 int64_t SharedRuntime::_nof_inlined_interface_calls = 0;
208
209 uint SharedRuntime::_new_instance_ctr=0;
210 uint SharedRuntime::_new_array_ctr=0;
211 uint SharedRuntime::_multi2_ctr=0;
212 uint SharedRuntime::_multi3_ctr=0;
213 uint SharedRuntime::_multi4_ctr=0;
214 uint SharedRuntime::_multi5_ctr=0;
215 uint SharedRuntime::_mon_enter_stub_ctr=0;
216 uint SharedRuntime::_mon_exit_stub_ctr=0;
217 uint SharedRuntime::_mon_enter_ctr=0;
218 uint SharedRuntime::_mon_exit_ctr=0;
219 uint SharedRuntime::_partial_subtype_ctr=0;
220 uint SharedRuntime::_jbyte_array_copy_ctr=0;
221 uint SharedRuntime::_jshort_array_copy_ctr=0;
222 uint SharedRuntime::_jint_array_copy_ctr=0;
223 uint SharedRuntime::_jlong_array_copy_ctr=0;
224 uint SharedRuntime::_oop_array_copy_ctr=0;
225 uint SharedRuntime::_checkcast_array_copy_ctr=0;
226 uint SharedRuntime::_unsafe_array_copy_ctr=0;
227 uint SharedRuntime::_generic_array_copy_ctr=0;
228 uint SharedRuntime::_slow_array_copy_ctr=0;
229 uint SharedRuntime::_find_handler_ctr=0;
230 uint SharedRuntime::_rethrow_ctr=0;
231 uint SharedRuntime::_unsafe_set_memory_ctr=0;
232
233 int SharedRuntime::_ICmiss_index = 0;
234 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
235 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
236
237
238 void SharedRuntime::trace_ic_miss(address at) {
239 for (int i = 0; i < _ICmiss_index; i++) {
240 if (_ICmiss_at[i] == at) {
241 _ICmiss_count[i]++;
242 return;
243 }
244 }
245 int index = _ICmiss_index++;
246 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
247 _ICmiss_at[index] = at;
248 _ICmiss_count[index] = 1;
249 }
250
251 void SharedRuntime::print_ic_miss_histogram() {
252 if (ICMissHistogram) {
253 tty->print_cr("IC Miss Histogram:");
254 int tot_misses = 0;
255 for (int i = 0; i < _ICmiss_index; i++) {
256 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
257 tot_misses += _ICmiss_count[i];
258 }
259 tty->print_cr("Total IC misses: %7d", tot_misses);
260 }
261 }
262 #endif // PRODUCT
263
264
265 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
266 return x * y;
267 JRT_END
268
269
270 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
271 if (x == min_jlong && y == CONST64(-1)) {
272 return x;
273 } else {
274 return x / y;
275 }
276 JRT_END
277
278
279 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
280 if (x == min_jlong && y == CONST64(-1)) {
281 return 0;
282 } else {
283 return x % y;
284 }
285 JRT_END
286
287
288 #ifdef _WIN64
289 const juint float_sign_mask = 0x7FFFFFFF;
290 const juint float_infinity = 0x7F800000;
291 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
292 const julong double_infinity = CONST64(0x7FF0000000000000);
293 #endif
294
295 #if !defined(X86)
296 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
297 #ifdef _WIN64
298 // 64-bit Windows on amd64 returns the wrong values for
299 // infinity operands.
300 juint xbits = PrimitiveConversions::cast<juint>(x);
301 juint ybits = PrimitiveConversions::cast<juint>(y);
302 // x Mod Infinity == x unless x is infinity
303 if (((xbits & float_sign_mask) != float_infinity) &&
304 ((ybits & float_sign_mask) == float_infinity) ) {
305 return x;
306 }
307 return ((jfloat)fmod_winx64((double)x, (double)y));
308 #else
309 return ((jfloat)fmod((double)x,(double)y));
310 #endif
311 JRT_END
312
313 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
314 #ifdef _WIN64
315 julong xbits = PrimitiveConversions::cast<julong>(x);
316 julong ybits = PrimitiveConversions::cast<julong>(y);
317 // x Mod Infinity == x unless x is infinity
318 if (((xbits & double_sign_mask) != double_infinity) &&
319 ((ybits & double_sign_mask) == double_infinity) ) {
320 return x;
321 }
322 return ((jdouble)fmod_winx64((double)x, (double)y));
323 #else
324 return ((jdouble)fmod((double)x,(double)y));
325 #endif
326 JRT_END
327 #endif // !X86
328
329 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
330 return (jfloat)x;
331 JRT_END
332
333 #ifdef __SOFTFP__
334 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
335 return x + y;
336 JRT_END
337
338 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
339 return x - y;
340 JRT_END
341
342 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
343 return x * y;
344 JRT_END
345
346 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
347 return x / y;
348 JRT_END
349
350 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
351 return x + y;
352 JRT_END
353
354 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
355 return x - y;
356 JRT_END
357
358 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
359 return x * y;
360 JRT_END
361
362 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
363 return x / y;
364 JRT_END
365
366 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
367 return (jdouble)x;
368 JRT_END
369
370 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
371 return (jdouble)x;
372 JRT_END
373
374 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
375 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
376 JRT_END
377
378 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
379 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
380 JRT_END
381
382 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
383 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
384 JRT_END
385
386 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
387 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
388 JRT_END
389
390 // Functions to return the opposite of the aeabi functions for nan.
391 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
392 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
393 JRT_END
394
395 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
396 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
397 JRT_END
398
399 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
400 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
401 JRT_END
402
403 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
404 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
405 JRT_END
406
407 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
408 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
409 JRT_END
410
411 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
412 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
413 JRT_END
414
415 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
416 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
417 JRT_END
418
419 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
420 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
421 JRT_END
422
423 // Intrinsics make gcc generate code for these.
424 float SharedRuntime::fneg(float f) {
425 return -f;
426 }
427
428 double SharedRuntime::dneg(double f) {
429 return -f;
430 }
431
432 #endif // __SOFTFP__
433
434 #if defined(__SOFTFP__) || defined(E500V2)
435 // Intrinsics make gcc generate code for these.
436 double SharedRuntime::dabs(double f) {
437 return (f <= (double)0.0) ? (double)0.0 - f : f;
438 }
439
440 #endif
441
442 #if defined(__SOFTFP__)
443 double SharedRuntime::dsqrt(double f) {
444 return sqrt(f);
445 }
446 #endif
447
448 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
449 if (g_isnan(x))
450 return 0;
451 if (x >= (jfloat) max_jint)
452 return max_jint;
453 if (x <= (jfloat) min_jint)
454 return min_jint;
455 return (jint) x;
456 JRT_END
457
458
459 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
460 if (g_isnan(x))
461 return 0;
462 if (x >= (jfloat) max_jlong)
463 return max_jlong;
464 if (x <= (jfloat) min_jlong)
465 return min_jlong;
466 return (jlong) x;
467 JRT_END
468
469
470 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
471 if (g_isnan(x))
472 return 0;
473 if (x >= (jdouble) max_jint)
474 return max_jint;
475 if (x <= (jdouble) min_jint)
476 return min_jint;
477 return (jint) x;
478 JRT_END
479
480
481 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
482 if (g_isnan(x))
483 return 0;
484 if (x >= (jdouble) max_jlong)
485 return max_jlong;
486 if (x <= (jdouble) min_jlong)
487 return min_jlong;
488 return (jlong) x;
489 JRT_END
490
491
492 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
493 return (jfloat)x;
494 JRT_END
495
496
497 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
498 return (jfloat)x;
499 JRT_END
500
501
502 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
503 return (jdouble)x;
504 JRT_END
505
506
507 // Exception handling across interpreter/compiler boundaries
508 //
509 // exception_handler_for_return_address(...) returns the continuation address.
510 // The continuation address is the entry point of the exception handler of the
511 // previous frame depending on the return address.
512
513 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* current, address return_address) {
514 // Note: This is called when we have unwound the frame of the callee that did
515 // throw an exception. So far, no check has been performed by the StackWatermarkSet.
516 // Notably, the stack is not walkable at this point, and hence the check must
517 // be deferred until later. Specifically, any of the handlers returned here in
518 // this function, will get dispatched to, and call deferred checks to
519 // StackWatermarkSet::after_unwind at a point where the stack is walkable.
520 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
521 assert(current->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
522
523 // Reset method handle flag.
524 current->set_is_method_handle_return(false);
525
526 #if INCLUDE_JVMCI
527 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
528 // and other exception handler continuations do not read it
529 current->set_exception_pc(nullptr);
530 #endif // INCLUDE_JVMCI
531
532 if (Continuation::is_return_barrier_entry(return_address)) {
533 return StubRoutines::cont_returnBarrierExc();
534 }
535
536 // The fastest case first
537 CodeBlob* blob = CodeCache::find_blob(return_address);
538 nmethod* nm = (blob != nullptr) ? blob->as_nmethod_or_null() : nullptr;
539 if (nm != nullptr) {
540 // Set flag if return address is a method handle call site.
541 current->set_is_method_handle_return(nm->is_method_handle_return(return_address));
542 // native nmethods don't have exception handlers
543 assert(!nm->is_native_method() || nm->method()->is_continuation_enter_intrinsic(), "no exception handler");
544 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
545 if (nm->is_deopt_pc(return_address)) {
546 // If we come here because of a stack overflow, the stack may be
547 // unguarded. Reguard the stack otherwise if we return to the
548 // deopt blob and the stack bang causes a stack overflow we
549 // crash.
550 StackOverflow* overflow_state = current->stack_overflow_state();
551 bool guard_pages_enabled = overflow_state->reguard_stack_if_needed();
552 if (overflow_state->reserved_stack_activation() != current->stack_base()) {
553 overflow_state->set_reserved_stack_activation(current->stack_base());
554 }
555 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
556 // The deferred StackWatermarkSet::after_unwind check will be performed in
557 // Deoptimization::fetch_unroll_info (with exec_mode == Unpack_exception)
558 return SharedRuntime::deopt_blob()->unpack_with_exception();
559 } else {
560 // The deferred StackWatermarkSet::after_unwind check will be performed in
561 // * OptoRuntime::handle_exception_C_helper for C2 code
562 // * exception_handler_for_pc_helper via Runtime1::handle_exception_from_callee_id for C1 code
563 return nm->exception_begin();
564 }
565 }
566
567 // Entry code
568 if (StubRoutines::returns_to_call_stub(return_address)) {
569 // The deferred StackWatermarkSet::after_unwind check will be performed in
570 // JavaCallWrapper::~JavaCallWrapper
571 assert (StubRoutines::catch_exception_entry() != nullptr, "must be generated before");
572 return StubRoutines::catch_exception_entry();
573 }
574 if (blob != nullptr && blob->is_upcall_stub()) {
575 return StubRoutines::upcall_stub_exception_handler();
576 }
577 // Interpreted code
578 if (Interpreter::contains(return_address)) {
579 // The deferred StackWatermarkSet::after_unwind check will be performed in
580 // InterpreterRuntime::exception_handler_for_exception
581 return Interpreter::rethrow_exception_entry();
582 }
583
584 guarantee(blob == nullptr || !blob->is_runtime_stub(), "caller should have skipped stub");
585 guarantee(!VtableStubs::contains(return_address), "null exceptions in vtables should have been handled already!");
586
587 #ifndef PRODUCT
588 { ResourceMark rm;
589 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
590 os::print_location(tty, (intptr_t)return_address);
591 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
592 tty->print_cr("b) other problem");
593 }
594 #endif // PRODUCT
595 ShouldNotReachHere();
596 return nullptr;
597 }
598
599
600 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* current, address return_address))
601 return raw_exception_handler_for_return_address(current, return_address);
602 JRT_END
603
604
605 address SharedRuntime::get_poll_stub(address pc) {
606 address stub;
607 // Look up the code blob
608 CodeBlob *cb = CodeCache::find_blob(pc);
609
610 // Should be an nmethod
611 guarantee(cb != nullptr && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
612
613 // Look up the relocation information
614 assert(cb->as_nmethod()->is_at_poll_or_poll_return(pc),
615 "safepoint polling: type must be poll at pc " INTPTR_FORMAT, p2i(pc));
616
617 #ifdef ASSERT
618 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
619 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
620 Disassembler::decode(cb);
621 fatal("Only polling locations are used for safepoint");
622 }
623 #endif
624
625 bool at_poll_return = cb->as_nmethod()->is_at_poll_return(pc);
626 bool has_wide_vectors = cb->as_nmethod()->has_wide_vectors();
627 if (at_poll_return) {
628 assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
629 "polling page return stub not created yet");
630 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
631 } else if (has_wide_vectors) {
632 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != nullptr,
633 "polling page vectors safepoint stub not created yet");
634 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
635 } else {
636 assert(SharedRuntime::polling_page_safepoint_handler_blob() != nullptr,
637 "polling page safepoint stub not created yet");
638 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
639 }
640 log_debug(safepoint)("... found polling page %s exception at pc = "
641 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
642 at_poll_return ? "return" : "loop",
643 (intptr_t)pc, (intptr_t)stub);
644 return stub;
645 }
646
647 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception) {
648 if (JvmtiExport::can_post_on_exceptions()) {
649 vframeStream vfst(current, true);
650 methodHandle method = methodHandle(current, vfst.method());
651 address bcp = method()->bcp_from(vfst.bci());
652 JvmtiExport::post_exception_throw(current, method(), bcp, h_exception());
653 }
654
655 #if INCLUDE_JVMCI
656 if (EnableJVMCI) {
657 vframeStream vfst(current, true);
658 methodHandle method = methodHandle(current, vfst.method());
659 int bci = vfst.bci();
660 MethodData* trap_mdo = method->method_data();
661 if (trap_mdo != nullptr) {
662 // Set exception_seen if the exceptional bytecode is an invoke
663 Bytecode_invoke call = Bytecode_invoke_check(method, bci);
664 if (call.is_valid()) {
665 ResourceMark rm(current);
666
667 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
668 MutexLocker ml(trap_mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
669
670 ProfileData* pdata = trap_mdo->allocate_bci_to_data(bci, nullptr);
671 if (pdata != nullptr && pdata->is_BitData()) {
672 BitData* bit_data = (BitData*) pdata;
673 bit_data->set_exception_seen();
674 }
675 }
676 }
677 }
678 #endif
679
680 Exceptions::_throw(current, __FILE__, __LINE__, h_exception);
681 }
682
683 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message) {
684 Handle h_exception = Exceptions::new_exception(current, name, message);
685 throw_and_post_jvmti_exception(current, h_exception);
686 }
687
688 #if INCLUDE_JVMTI
689 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current))
690 assert(hide == JNI_FALSE, "must be VTMS transition finish");
691 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
692 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
693 JNIHandles::destroy_local(vthread);
694 JRT_END
695
696 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current))
697 assert(hide == JNI_TRUE, "must be VTMS transition start");
698 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
699 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
700 JNIHandles::destroy_local(vthread);
701 JRT_END
702
703 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current))
704 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
705 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
706 JNIHandles::destroy_local(vthread);
707 JRT_END
708
709 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current))
710 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
711 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
712 JNIHandles::destroy_local(vthread);
713 JRT_END
714 #endif // INCLUDE_JVMTI
715
716 // The interpreter code to call this tracing function is only
717 // called/generated when UL is on for redefine, class and has the right level
718 // and tags. Since obsolete methods are never compiled, we don't have
719 // to modify the compilers to generate calls to this function.
720 //
721 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
722 JavaThread* thread, Method* method))
723 if (method->is_obsolete()) {
724 // We are calling an obsolete method, but this is not necessarily
725 // an error. Our method could have been redefined just after we
726 // fetched the Method* from the constant pool.
727 ResourceMark rm;
728 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
729 }
730 return 0;
731 JRT_END
732
733 // ret_pc points into caller; we are returning caller's exception handler
734 // for given exception
735 // Note that the implementation of this method assumes it's only called when an exception has actually occured
736 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
737 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
738 assert(nm != nullptr, "must exist");
739 ResourceMark rm;
740
741 #if INCLUDE_JVMCI
742 if (nm->is_compiled_by_jvmci()) {
743 // lookup exception handler for this pc
744 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
745 ExceptionHandlerTable table(nm);
746 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
747 if (t != nullptr) {
748 return nm->code_begin() + t->pco();
749 } else {
750 return Deoptimization::deoptimize_for_missing_exception_handler(nm);
751 }
752 }
753 #endif // INCLUDE_JVMCI
754
755 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
756 // determine handler bci, if any
757 EXCEPTION_MARK;
758
759 int handler_bci = -1;
760 int scope_depth = 0;
761 if (!force_unwind) {
762 int bci = sd->bci();
763 bool recursive_exception = false;
764 do {
765 bool skip_scope_increment = false;
766 // exception handler lookup
767 Klass* ek = exception->klass();
768 methodHandle mh(THREAD, sd->method());
769 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
770 if (HAS_PENDING_EXCEPTION) {
771 recursive_exception = true;
772 // We threw an exception while trying to find the exception handler.
773 // Transfer the new exception to the exception handle which will
774 // be set into thread local storage, and do another lookup for an
775 // exception handler for this exception, this time starting at the
776 // BCI of the exception handler which caused the exception to be
777 // thrown (bugs 4307310 and 4546590). Set "exception" reference
778 // argument to ensure that the correct exception is thrown (4870175).
779 recursive_exception_occurred = true;
780 exception = Handle(THREAD, PENDING_EXCEPTION);
781 CLEAR_PENDING_EXCEPTION;
782 if (handler_bci >= 0) {
783 bci = handler_bci;
784 handler_bci = -1;
785 skip_scope_increment = true;
786 }
787 }
788 else {
789 recursive_exception = false;
790 }
791 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
792 sd = sd->sender();
793 if (sd != nullptr) {
794 bci = sd->bci();
795 }
796 ++scope_depth;
797 }
798 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != nullptr));
799 }
800
801 // found handling method => lookup exception handler
802 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
803
804 ExceptionHandlerTable table(nm);
805 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
806 if (t == nullptr && (nm->is_compiled_by_c1() || handler_bci != -1)) {
807 // Allow abbreviated catch tables. The idea is to allow a method
808 // to materialize its exceptions without committing to the exact
809 // routing of exceptions. In particular this is needed for adding
810 // a synthetic handler to unlock monitors when inlining
811 // synchronized methods since the unlock path isn't represented in
812 // the bytecodes.
813 t = table.entry_for(catch_pco, -1, 0);
814 }
815
816 #ifdef COMPILER1
817 if (t == nullptr && nm->is_compiled_by_c1()) {
818 assert(nm->unwind_handler_begin() != nullptr, "");
819 return nm->unwind_handler_begin();
820 }
821 #endif
822
823 if (t == nullptr) {
824 ttyLocker ttyl;
825 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d, catch_pco: %d", p2i(ret_pc), handler_bci, catch_pco);
826 tty->print_cr(" Exception:");
827 exception->print();
828 tty->cr();
829 tty->print_cr(" Compiled exception table :");
830 table.print();
831 nm->print();
832 nm->print_code();
833 guarantee(false, "missing exception handler");
834 return nullptr;
835 }
836
837 if (handler_bci != -1) { // did we find a handler in this method?
838 sd->method()->set_exception_handler_entered(handler_bci); // profile
839 }
840 return nm->code_begin() + t->pco();
841 }
842
843 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* current))
844 // These errors occur only at call sites
845 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_AbstractMethodError());
846 JRT_END
847
848 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
849 // These errors occur only at call sites
850 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
851 JRT_END
852
853 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* current))
854 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
855 JRT_END
856
857 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* current))
858 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
859 JRT_END
860
861 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* current))
862 // This entry point is effectively only used for NullPointerExceptions which occur at inline
863 // cache sites (when the callee activation is not yet set up) so we are at a call site
864 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
865 JRT_END
866
867 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* current))
868 throw_StackOverflowError_common(current, false);
869 JRT_END
870
871 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* current))
872 throw_StackOverflowError_common(current, true);
873 JRT_END
874
875 void SharedRuntime::throw_StackOverflowError_common(JavaThread* current, bool delayed) {
876 // We avoid using the normal exception construction in this case because
877 // it performs an upcall to Java, and we're already out of stack space.
878 JavaThread* THREAD = current; // For exception macros.
879 Klass* k = vmClasses::StackOverflowError_klass();
880 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
881 if (delayed) {
882 java_lang_Throwable::set_message(exception_oop,
883 Universe::delayed_stack_overflow_error_message());
884 }
885 Handle exception (current, exception_oop);
886 if (StackTraceInThrowable) {
887 java_lang_Throwable::fill_in_stack_trace(exception);
888 }
889 // Remove the ScopedValue bindings in case we got a
890 // StackOverflowError while we were trying to remove ScopedValue
891 // bindings.
892 current->clear_scopedValueBindings();
893 // Increment counter for hs_err file reporting
894 Atomic::inc(&Exceptions::_stack_overflow_errors);
895 throw_and_post_jvmti_exception(current, exception);
896 }
897
898 address SharedRuntime::continuation_for_implicit_exception(JavaThread* current,
899 address pc,
900 ImplicitExceptionKind exception_kind)
901 {
902 address target_pc = nullptr;
903
904 if (Interpreter::contains(pc)) {
905 switch (exception_kind) {
906 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
907 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
908 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
909 default: ShouldNotReachHere();
910 }
911 } else {
912 switch (exception_kind) {
913 case STACK_OVERFLOW: {
914 // Stack overflow only occurs upon frame setup; the callee is
915 // going to be unwound. Dispatch to a shared runtime stub
916 // which will cause the StackOverflowError to be fabricated
917 // and processed.
918 // Stack overflow should never occur during deoptimization:
919 // the compiled method bangs the stack by as much as the
920 // interpreter would need in case of a deoptimization. The
921 // deoptimization blob and uncommon trap blob bang the stack
922 // in a debug VM to verify the correctness of the compiled
923 // method stack banging.
924 assert(current->deopt_mark() == nullptr, "no stack overflow from deopt blob/uncommon trap");
925 Events::log_exception(current, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
926 return SharedRuntime::throw_StackOverflowError_entry();
927 }
928
929 case IMPLICIT_NULL: {
930 if (VtableStubs::contains(pc)) {
931 // We haven't yet entered the callee frame. Fabricate an
932 // exception and begin dispatching it in the caller. Since
933 // the caller was at a call site, it's safe to destroy all
934 // caller-saved registers, as these entry points do.
935 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
936
937 // If vt_stub is null, then return null to signal handler to report the SEGV error.
938 if (vt_stub == nullptr) return nullptr;
939
940 if (vt_stub->is_abstract_method_error(pc)) {
941 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
942 Events::log_exception(current, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
943 // Instead of throwing the abstract method error here directly, we re-resolve
944 // and will throw the AbstractMethodError during resolve. As a result, we'll
945 // get a more detailed error message.
946 return SharedRuntime::get_handle_wrong_method_stub();
947 } else {
948 Events::log_exception(current, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
949 // Assert that the signal comes from the expected location in stub code.
950 assert(vt_stub->is_null_pointer_exception(pc),
951 "obtained signal from unexpected location in stub code");
952 return SharedRuntime::throw_NullPointerException_at_call_entry();
953 }
954 } else {
955 CodeBlob* cb = CodeCache::find_blob(pc);
956
957 // If code blob is null, then return null to signal handler to report the SEGV error.
958 if (cb == nullptr) return nullptr;
959
960 // Exception happened in CodeCache. Must be either:
961 // 1. Inline-cache check in C2I handler blob,
962 // 2. Inline-cache check in nmethod, or
963 // 3. Implicit null exception in nmethod
964
965 if (!cb->is_nmethod()) {
966 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
967 if (!is_in_blob) {
968 // Allow normal crash reporting to handle this
969 return nullptr;
970 }
971 Events::log_exception(current, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
972 // There is no handler here, so we will simply unwind.
973 return SharedRuntime::throw_NullPointerException_at_call_entry();
974 }
975
976 // Otherwise, it's a compiled method. Consult its exception handlers.
977 nmethod* nm = cb->as_nmethod();
978 if (nm->inlinecache_check_contains(pc)) {
979 // exception happened inside inline-cache check code
980 // => the nmethod is not yet active (i.e., the frame
981 // is not set up yet) => use return address pushed by
982 // caller => don't push another return address
983 Events::log_exception(current, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
984 return SharedRuntime::throw_NullPointerException_at_call_entry();
985 }
986
987 if (nm->method()->is_method_handle_intrinsic()) {
988 // exception happened inside MH dispatch code, similar to a vtable stub
989 Events::log_exception(current, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
990 return SharedRuntime::throw_NullPointerException_at_call_entry();
991 }
992
993 #ifndef PRODUCT
994 _implicit_null_throws++;
995 #endif
996 target_pc = nm->continuation_for_implicit_null_exception(pc);
997 // If there's an unexpected fault, target_pc might be null,
998 // in which case we want to fall through into the normal
999 // error handling code.
1000 }
1001
1002 break; // fall through
1003 }
1004
1005
1006 case IMPLICIT_DIVIDE_BY_ZERO: {
1007 nmethod* nm = CodeCache::find_nmethod(pc);
1008 guarantee(nm != nullptr, "must have containing compiled method for implicit division-by-zero exceptions");
1009 #ifndef PRODUCT
1010 _implicit_div0_throws++;
1011 #endif
1012 target_pc = nm->continuation_for_implicit_div0_exception(pc);
1013 // If there's an unexpected fault, target_pc might be null,
1014 // in which case we want to fall through into the normal
1015 // error handling code.
1016 break; // fall through
1017 }
1018
1019 default: ShouldNotReachHere();
1020 }
1021
1022 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
1023
1024 if (exception_kind == IMPLICIT_NULL) {
1025 #ifndef PRODUCT
1026 // for AbortVMOnException flag
1027 Exceptions::debug_check_abort("java.lang.NullPointerException");
1028 #endif //PRODUCT
1029 Events::log_exception(current, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1030 } else {
1031 #ifndef PRODUCT
1032 // for AbortVMOnException flag
1033 Exceptions::debug_check_abort("java.lang.ArithmeticException");
1034 #endif //PRODUCT
1035 Events::log_exception(current, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1036 }
1037 return target_pc;
1038 }
1039
1040 ShouldNotReachHere();
1041 return nullptr;
1042 }
1043
1044
1045 /**
1046 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
1047 * installed in the native function entry of all native Java methods before
1048 * they get linked to their actual native methods.
1049 *
1050 * \note
1051 * This method actually never gets called! The reason is because
1052 * the interpreter's native entries call NativeLookup::lookup() which
1053 * throws the exception when the lookup fails. The exception is then
1054 * caught and forwarded on the return from NativeLookup::lookup() call
1055 * before the call to the native function. This might change in the future.
1056 */
1057 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
1058 {
1059 // We return a bad value here to make sure that the exception is
1060 // forwarded before we look at the return value.
1061 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
1062 }
1063 JNI_END
1064
1065 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
1066 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
1067 }
1068
1069 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
1070 #if INCLUDE_JVMCI
1071 if (!obj->klass()->has_finalizer()) {
1072 return;
1073 }
1074 #endif // INCLUDE_JVMCI
1075 assert(oopDesc::is_oop(obj), "must be a valid oop");
1076 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1077 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1078 JRT_END
1079
1080 jlong SharedRuntime::get_java_tid(JavaThread* thread) {
1081 assert(thread != nullptr, "No thread");
1082 if (thread == nullptr) {
1083 return 0;
1084 }
1085 guarantee(Thread::current() != thread || thread->is_oop_safe(),
1086 "current cannot touch oops after its GC barrier is detached.");
1087 oop obj = thread->threadObj();
1088 return (obj == nullptr) ? 0 : java_lang_Thread::thread_id(obj);
1089 }
1090
1091 /**
1092 * This function ought to be a void function, but cannot be because
1093 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1094 * 6254741. Once that is fixed we can remove the dummy return value.
1095 */
1096 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1097 return dtrace_object_alloc(JavaThread::current(), o, o->size());
1098 }
1099
1100 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o) {
1101 return dtrace_object_alloc(thread, o, o->size());
1102 }
1103
1104 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size) {
1105 assert(DTraceAllocProbes, "wrong call");
1106 Klass* klass = o->klass();
1107 Symbol* name = klass->name();
1108 HOTSPOT_OBJECT_ALLOC(
1109 get_java_tid(thread),
1110 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1111 return 0;
1112 }
1113
1114 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1115 JavaThread* current, Method* method))
1116 assert(current == JavaThread::current(), "pre-condition");
1117
1118 assert(DTraceMethodProbes, "wrong call");
1119 Symbol* kname = method->klass_name();
1120 Symbol* name = method->name();
1121 Symbol* sig = method->signature();
1122 HOTSPOT_METHOD_ENTRY(
1123 get_java_tid(current),
1124 (char *) kname->bytes(), kname->utf8_length(),
1125 (char *) name->bytes(), name->utf8_length(),
1126 (char *) sig->bytes(), sig->utf8_length());
1127 return 0;
1128 JRT_END
1129
1130 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1131 JavaThread* current, Method* method))
1132 assert(current == JavaThread::current(), "pre-condition");
1133 assert(DTraceMethodProbes, "wrong call");
1134 Symbol* kname = method->klass_name();
1135 Symbol* name = method->name();
1136 Symbol* sig = method->signature();
1137 HOTSPOT_METHOD_RETURN(
1138 get_java_tid(current),
1139 (char *) kname->bytes(), kname->utf8_length(),
1140 (char *) name->bytes(), name->utf8_length(),
1141 (char *) sig->bytes(), sig->utf8_length());
1142 return 0;
1143 JRT_END
1144
1145
1146 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1147 // for a call current in progress, i.e., arguments has been pushed on stack
1148 // put callee has not been invoked yet. Used by: resolve virtual/static,
1149 // vtable updates, etc. Caller frame must be compiled.
1150 Handle SharedRuntime::find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1151 JavaThread* current = THREAD;
1152 ResourceMark rm(current);
1153
1154 // last java frame on stack (which includes native call frames)
1155 vframeStream vfst(current, true); // Do not skip and javaCalls
1156
1157 return find_callee_info_helper(vfst, bc, callinfo, THREAD);
1158 }
1159
1160 Method* SharedRuntime::extract_attached_method(vframeStream& vfst) {
1161 nmethod* caller = vfst.nm();
1162
1163 address pc = vfst.frame_pc();
1164 { // Get call instruction under lock because another thread may be busy patching it.
1165 CompiledICLocker ic_locker(caller);
1166 return caller->attached_method_before_pc(pc);
1167 }
1168 return nullptr;
1169 }
1170
1171 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1172 // for a call current in progress, i.e., arguments has been pushed on stack
1173 // but callee has not been invoked yet. Caller frame must be compiled.
1174 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1175 CallInfo& callinfo, TRAPS) {
1176 Handle receiver;
1177 Handle nullHandle; // create a handy null handle for exception returns
1178 JavaThread* current = THREAD;
1179
1180 assert(!vfst.at_end(), "Java frame must exist");
1181
1182 // Find caller and bci from vframe
1183 methodHandle caller(current, vfst.method());
1184 int bci = vfst.bci();
1185
1186 if (caller->is_continuation_enter_intrinsic()) {
1187 bc = Bytecodes::_invokestatic;
1188 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1189 return receiver;
1190 }
1191
1192 Bytecode_invoke bytecode(caller, bci);
1193 int bytecode_index = bytecode.index();
1194 bc = bytecode.invoke_code();
1195
1196 methodHandle attached_method(current, extract_attached_method(vfst));
1197 if (attached_method.not_null()) {
1198 Method* callee = bytecode.static_target(CHECK_NH);
1199 vmIntrinsics::ID id = callee->intrinsic_id();
1200 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1201 // it attaches statically resolved method to the call site.
1202 if (MethodHandles::is_signature_polymorphic(id) &&
1203 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1204 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1205
1206 // Adjust invocation mode according to the attached method.
1207 switch (bc) {
1208 case Bytecodes::_invokevirtual:
1209 if (attached_method->method_holder()->is_interface()) {
1210 bc = Bytecodes::_invokeinterface;
1211 }
1212 break;
1213 case Bytecodes::_invokeinterface:
1214 if (!attached_method->method_holder()->is_interface()) {
1215 bc = Bytecodes::_invokevirtual;
1216 }
1217 break;
1218 case Bytecodes::_invokehandle:
1219 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1220 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1221 : Bytecodes::_invokevirtual;
1222 }
1223 break;
1224 default:
1225 break;
1226 }
1227 }
1228 }
1229
1230 assert(bc != Bytecodes::_illegal, "not initialized");
1231
1232 bool has_receiver = bc != Bytecodes::_invokestatic &&
1233 bc != Bytecodes::_invokedynamic &&
1234 bc != Bytecodes::_invokehandle;
1235
1236 // Find receiver for non-static call
1237 if (has_receiver) {
1238 // This register map must be update since we need to find the receiver for
1239 // compiled frames. The receiver might be in a register.
1240 RegisterMap reg_map2(current,
1241 RegisterMap::UpdateMap::include,
1242 RegisterMap::ProcessFrames::include,
1243 RegisterMap::WalkContinuation::skip);
1244 frame stubFrame = current->last_frame();
1245 // Caller-frame is a compiled frame
1246 frame callerFrame = stubFrame.sender(®_map2);
1247
1248 if (attached_method.is_null()) {
1249 Method* callee = bytecode.static_target(CHECK_NH);
1250 if (callee == nullptr) {
1251 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1252 }
1253 }
1254
1255 // Retrieve from a compiled argument list
1256 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1257 assert(oopDesc::is_oop_or_null(receiver()), "");
1258
1259 if (receiver.is_null()) {
1260 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1261 }
1262 }
1263
1264 // Resolve method
1265 if (attached_method.not_null()) {
1266 // Parameterized by attached method.
1267 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1268 } else {
1269 // Parameterized by bytecode.
1270 constantPoolHandle constants(current, caller->constants());
1271 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1272 }
1273
1274 #ifdef ASSERT
1275 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1276 if (has_receiver) {
1277 assert(receiver.not_null(), "should have thrown exception");
1278 Klass* receiver_klass = receiver->klass();
1279 Klass* rk = nullptr;
1280 if (attached_method.not_null()) {
1281 // In case there's resolved method attached, use its holder during the check.
1282 rk = attached_method->method_holder();
1283 } else {
1284 // Klass is already loaded.
1285 constantPoolHandle constants(current, caller->constants());
1286 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1287 }
1288 Klass* static_receiver_klass = rk;
1289 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1290 "actual receiver must be subclass of static receiver klass");
1291 if (receiver_klass->is_instance_klass()) {
1292 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1293 tty->print_cr("ERROR: Klass not yet initialized!!");
1294 receiver_klass->print();
1295 }
1296 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1297 }
1298 }
1299 #endif
1300
1301 return receiver;
1302 }
1303
1304 methodHandle SharedRuntime::find_callee_method(TRAPS) {
1305 JavaThread* current = THREAD;
1306 ResourceMark rm(current);
1307 // We need first to check if any Java activations (compiled, interpreted)
1308 // exist on the stack since last JavaCall. If not, we need
1309 // to get the target method from the JavaCall wrapper.
1310 vframeStream vfst(current, true); // Do not skip any javaCalls
1311 methodHandle callee_method;
1312 if (vfst.at_end()) {
1313 // No Java frames were found on stack since we did the JavaCall.
1314 // Hence the stack can only contain an entry_frame. We need to
1315 // find the target method from the stub frame.
1316 RegisterMap reg_map(current,
1317 RegisterMap::UpdateMap::skip,
1318 RegisterMap::ProcessFrames::include,
1319 RegisterMap::WalkContinuation::skip);
1320 frame fr = current->last_frame();
1321 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1322 fr = fr.sender(®_map);
1323 assert(fr.is_entry_frame(), "must be");
1324 // fr is now pointing to the entry frame.
1325 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1326 } else {
1327 Bytecodes::Code bc;
1328 CallInfo callinfo;
1329 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1330 callee_method = methodHandle(current, callinfo.selected_method());
1331 }
1332 assert(callee_method()->is_method(), "must be");
1333 return callee_method;
1334 }
1335
1336 // Resolves a call.
1337 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1338 JavaThread* current = THREAD;
1339 ResourceMark rm(current);
1340 RegisterMap cbl_map(current,
1341 RegisterMap::UpdateMap::skip,
1342 RegisterMap::ProcessFrames::include,
1343 RegisterMap::WalkContinuation::skip);
1344 frame caller_frame = current->last_frame().sender(&cbl_map);
1345
1346 CodeBlob* caller_cb = caller_frame.cb();
1347 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1348 nmethod* caller_nm = caller_cb->as_nmethod();
1349
1350 // determine call info & receiver
1351 // note: a) receiver is null for static calls
1352 // b) an exception is thrown if receiver is null for non-static calls
1353 CallInfo call_info;
1354 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1355 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1356
1357 NoSafepointVerifier nsv;
1358
1359 methodHandle callee_method(current, call_info.selected_method());
1360
1361 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1362 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1363 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1364 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1365 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1366
1367 assert(!caller_nm->is_unloading(), "It should not be unloading");
1368
1369 #ifndef PRODUCT
1370 // tracing/debugging/statistics
1371 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1372 (is_virtual) ? (&_resolve_virtual_ctr) :
1373 (&_resolve_static_ctr);
1374 Atomic::inc(addr);
1375
1376 if (TraceCallFixup) {
1377 ResourceMark rm(current);
1378 tty->print("resolving %s%s (%s) call to",
1379 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1380 Bytecodes::name(invoke_code));
1381 callee_method->print_short_name(tty);
1382 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1383 p2i(caller_frame.pc()), p2i(callee_method->code()));
1384 }
1385 #endif
1386
1387 if (invoke_code == Bytecodes::_invokestatic) {
1388 assert(callee_method->method_holder()->is_initialized() ||
1389 callee_method->method_holder()->is_reentrant_initialization(current),
1390 "invalid class initialization state for invoke_static");
1391 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1392 // In order to keep class initialization check, do not patch call
1393 // site for static call when the class is not fully initialized.
1394 // Proper check is enforced by call site re-resolution on every invocation.
1395 //
1396 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1397 // explicit class initialization check is put in nmethod entry (VEP).
1398 assert(callee_method->method_holder()->is_linked(), "must be");
1399 return callee_method;
1400 }
1401 }
1402
1403
1404 // JSR 292 key invariant:
1405 // If the resolved method is a MethodHandle invoke target, the call
1406 // site must be a MethodHandle call site, because the lambda form might tail-call
1407 // leaving the stack in a state unknown to either caller or callee
1408
1409 // Compute entry points. The computation of the entry points is independent of
1410 // patching the call.
1411
1412 // Make sure the callee nmethod does not get deoptimized and removed before
1413 // we are done patching the code.
1414
1415
1416 CompiledICLocker ml(caller_nm);
1417 if (is_virtual && !is_optimized) {
1418 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1419 inline_cache->update(&call_info, receiver->klass());
1420 } else {
1421 // Callsite is a direct call - set it to the destination method
1422 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1423 callsite->set(callee_method);
1424 }
1425
1426 return callee_method;
1427 }
1428
1429 // Inline caches exist only in compiled code
1430 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1431 #ifdef ASSERT
1432 RegisterMap reg_map(current,
1433 RegisterMap::UpdateMap::skip,
1434 RegisterMap::ProcessFrames::include,
1435 RegisterMap::WalkContinuation::skip);
1436 frame stub_frame = current->last_frame();
1437 assert(stub_frame.is_runtime_frame(), "sanity check");
1438 frame caller_frame = stub_frame.sender(®_map);
1439 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1440 #endif /* ASSERT */
1441
1442 methodHandle callee_method;
1443 JRT_BLOCK
1444 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1445 // Return Method* through TLS
1446 current->set_vm_result_metadata(callee_method());
1447 JRT_BLOCK_END
1448 // return compiled code entry point after potential safepoints
1449 return get_resolved_entry(current, callee_method);
1450 JRT_END
1451
1452
1453 // Handle call site that has been made non-entrant
1454 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1455 // 6243940 We might end up in here if the callee is deoptimized
1456 // as we race to call it. We don't want to take a safepoint if
1457 // the caller was interpreted because the caller frame will look
1458 // interpreted to the stack walkers and arguments are now
1459 // "compiled" so it is much better to make this transition
1460 // invisible to the stack walking code. The i2c path will
1461 // place the callee method in the callee_target. It is stashed
1462 // there because if we try and find the callee by normal means a
1463 // safepoint is possible and have trouble gc'ing the compiled args.
1464 RegisterMap reg_map(current,
1465 RegisterMap::UpdateMap::skip,
1466 RegisterMap::ProcessFrames::include,
1467 RegisterMap::WalkContinuation::skip);
1468 frame stub_frame = current->last_frame();
1469 assert(stub_frame.is_runtime_frame(), "sanity check");
1470 frame caller_frame = stub_frame.sender(®_map);
1471
1472 if (caller_frame.is_interpreted_frame() ||
1473 caller_frame.is_entry_frame() ||
1474 caller_frame.is_upcall_stub_frame()) {
1475 Method* callee = current->callee_target();
1476 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1477 current->set_vm_result_metadata(callee);
1478 current->set_callee_target(nullptr);
1479 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1480 // Bypass class initialization checks in c2i when caller is in native.
1481 // JNI calls to static methods don't have class initialization checks.
1482 // Fast class initialization checks are present in c2i adapters and call into
1483 // SharedRuntime::handle_wrong_method() on the slow path.
1484 //
1485 // JVM upcalls may land here as well, but there's a proper check present in
1486 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1487 // so bypassing it in c2i adapter is benign.
1488 return callee->get_c2i_no_clinit_check_entry();
1489 } else {
1490 return callee->get_c2i_entry();
1491 }
1492 }
1493
1494 // Must be compiled to compiled path which is safe to stackwalk
1495 methodHandle callee_method;
1496 JRT_BLOCK
1497 // Force resolving of caller (if we called from compiled frame)
1498 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1499 current->set_vm_result_metadata(callee_method());
1500 JRT_BLOCK_END
1501 // return compiled code entry point after potential safepoints
1502 return get_resolved_entry(current, callee_method);
1503 JRT_END
1504
1505 // Handle abstract method call
1506 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1507 // Verbose error message for AbstractMethodError.
1508 // Get the called method from the invoke bytecode.
1509 vframeStream vfst(current, true);
1510 assert(!vfst.at_end(), "Java frame must exist");
1511 methodHandle caller(current, vfst.method());
1512 Bytecode_invoke invoke(caller, vfst.bci());
1513 DEBUG_ONLY( invoke.verify(); )
1514
1515 // Find the compiled caller frame.
1516 RegisterMap reg_map(current,
1517 RegisterMap::UpdateMap::include,
1518 RegisterMap::ProcessFrames::include,
1519 RegisterMap::WalkContinuation::skip);
1520 frame stubFrame = current->last_frame();
1521 assert(stubFrame.is_runtime_frame(), "must be");
1522 frame callerFrame = stubFrame.sender(®_map);
1523 assert(callerFrame.is_compiled_frame(), "must be");
1524
1525 // Install exception and return forward entry.
1526 address res = SharedRuntime::throw_AbstractMethodError_entry();
1527 JRT_BLOCK
1528 methodHandle callee(current, invoke.static_target(current));
1529 if (!callee.is_null()) {
1530 oop recv = callerFrame.retrieve_receiver(®_map);
1531 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1532 res = StubRoutines::forward_exception_entry();
1533 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1534 }
1535 JRT_BLOCK_END
1536 return res;
1537 JRT_END
1538
1539 // return verified_code_entry if interp_only_mode is not set for the current thread;
1540 // otherwise return c2i entry.
1541 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method) {
1542 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1543 // In interp_only_mode we need to go to the interpreted entry
1544 // The c2i won't patch in this mode -- see fixup_callers_callsite
1545 return callee_method->get_c2i_entry();
1546 }
1547 assert(callee_method->verified_code_entry() != nullptr, " Jump to zero!");
1548 return callee_method->verified_code_entry();
1549 }
1550
1551 // resolve a static call and patch code
1552 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1553 methodHandle callee_method;
1554 bool enter_special = false;
1555 JRT_BLOCK
1556 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1557 current->set_vm_result_metadata(callee_method());
1558 JRT_BLOCK_END
1559 // return compiled code entry point after potential safepoints
1560 return get_resolved_entry(current, callee_method);
1561 JRT_END
1562
1563 // resolve virtual call and update inline cache to monomorphic
1564 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1565 methodHandle callee_method;
1566 JRT_BLOCK
1567 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1568 current->set_vm_result_metadata(callee_method());
1569 JRT_BLOCK_END
1570 // return compiled code entry point after potential safepoints
1571 return get_resolved_entry(current, callee_method);
1572 JRT_END
1573
1574
1575 // Resolve a virtual call that can be statically bound (e.g., always
1576 // monomorphic, so it has no inline cache). Patch code to resolved target.
1577 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1578 methodHandle callee_method;
1579 JRT_BLOCK
1580 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1581 current->set_vm_result_metadata(callee_method());
1582 JRT_BLOCK_END
1583 // return compiled code entry point after potential safepoints
1584 return get_resolved_entry(current, callee_method);
1585 JRT_END
1586
1587 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1588 JavaThread* current = THREAD;
1589 ResourceMark rm(current);
1590 CallInfo call_info;
1591 Bytecodes::Code bc;
1592
1593 // receiver is null for static calls. An exception is thrown for null
1594 // receivers for non-static calls
1595 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1596
1597 methodHandle callee_method(current, call_info.selected_method());
1598
1599 #ifndef PRODUCT
1600 Atomic::inc(&_ic_miss_ctr);
1601
1602 // Statistics & Tracing
1603 if (TraceCallFixup) {
1604 ResourceMark rm(current);
1605 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1606 callee_method->print_short_name(tty);
1607 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1608 }
1609
1610 if (ICMissHistogram) {
1611 MutexLocker m(VMStatistic_lock);
1612 RegisterMap reg_map(current,
1613 RegisterMap::UpdateMap::skip,
1614 RegisterMap::ProcessFrames::include,
1615 RegisterMap::WalkContinuation::skip);
1616 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1617 // produce statistics under the lock
1618 trace_ic_miss(f.pc());
1619 }
1620 #endif
1621
1622 // install an event collector so that when a vtable stub is created the
1623 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1624 // event can't be posted when the stub is created as locks are held
1625 // - instead the event will be deferred until the event collector goes
1626 // out of scope.
1627 JvmtiDynamicCodeEventCollector event_collector;
1628
1629 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1630 RegisterMap reg_map(current,
1631 RegisterMap::UpdateMap::skip,
1632 RegisterMap::ProcessFrames::include,
1633 RegisterMap::WalkContinuation::skip);
1634 frame caller_frame = current->last_frame().sender(®_map);
1635 CodeBlob* cb = caller_frame.cb();
1636 nmethod* caller_nm = cb->as_nmethod();
1637
1638 CompiledICLocker ml(caller_nm);
1639 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1640 inline_cache->update(&call_info, receiver()->klass());
1641
1642 return callee_method;
1643 }
1644
1645 //
1646 // Resets a call-site in compiled code so it will get resolved again.
1647 // This routines handles both virtual call sites, optimized virtual call
1648 // sites, and static call sites. Typically used to change a call sites
1649 // destination from compiled to interpreted.
1650 //
1651 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1652 JavaThread* current = THREAD;
1653 ResourceMark rm(current);
1654 RegisterMap reg_map(current,
1655 RegisterMap::UpdateMap::skip,
1656 RegisterMap::ProcessFrames::include,
1657 RegisterMap::WalkContinuation::skip);
1658 frame stub_frame = current->last_frame();
1659 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1660 frame caller = stub_frame.sender(®_map);
1661
1662 // Do nothing if the frame isn't a live compiled frame.
1663 // nmethod could be deoptimized by the time we get here
1664 // so no update to the caller is needed.
1665
1666 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1667 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1668
1669 address pc = caller.pc();
1670
1671 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1672 assert(caller_nm != nullptr, "did not find caller nmethod");
1673
1674 // Default call_addr is the location of the "basic" call.
1675 // Determine the address of the call we a reresolving. With
1676 // Inline Caches we will always find a recognizable call.
1677 // With Inline Caches disabled we may or may not find a
1678 // recognizable call. We will always find a call for static
1679 // calls and for optimized virtual calls. For vanilla virtual
1680 // calls it depends on the state of the UseInlineCaches switch.
1681 //
1682 // With Inline Caches disabled we can get here for a virtual call
1683 // for two reasons:
1684 // 1 - calling an abstract method. The vtable for abstract methods
1685 // will run us thru handle_wrong_method and we will eventually
1686 // end up in the interpreter to throw the ame.
1687 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1688 // call and between the time we fetch the entry address and
1689 // we jump to it the target gets deoptimized. Similar to 1
1690 // we will wind up in the interprter (thru a c2i with c2).
1691 //
1692 CompiledICLocker ml(caller_nm);
1693 address call_addr = caller_nm->call_instruction_address(pc);
1694
1695 if (call_addr != nullptr) {
1696 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1697 // bytes back in the instruction stream so we must also check for reloc info.
1698 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1699 bool ret = iter.next(); // Get item
1700 if (ret) {
1701 switch (iter.type()) {
1702 case relocInfo::static_call_type:
1703 case relocInfo::opt_virtual_call_type: {
1704 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1705 cdc->set_to_clean();
1706 break;
1707 }
1708
1709 case relocInfo::virtual_call_type: {
1710 // compiled, dispatched call (which used to call an interpreted method)
1711 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1712 inline_cache->set_to_clean();
1713 break;
1714 }
1715 default:
1716 break;
1717 }
1718 }
1719 }
1720 }
1721
1722 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1723
1724
1725 #ifndef PRODUCT
1726 Atomic::inc(&_wrong_method_ctr);
1727
1728 if (TraceCallFixup) {
1729 ResourceMark rm(current);
1730 tty->print("handle_wrong_method reresolving call to");
1731 callee_method->print_short_name(tty);
1732 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1733 }
1734 #endif
1735
1736 return callee_method;
1737 }
1738
1739 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1740 // The faulting unsafe accesses should be changed to throw the error
1741 // synchronously instead. Meanwhile the faulting instruction will be
1742 // skipped over (effectively turning it into a no-op) and an
1743 // asynchronous exception will be raised which the thread will
1744 // handle at a later point. If the instruction is a load it will
1745 // return garbage.
1746
1747 // Request an async exception.
1748 thread->set_pending_unsafe_access_error();
1749
1750 // Return address of next instruction to execute.
1751 return next_pc;
1752 }
1753
1754 #ifdef ASSERT
1755 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1756 const BasicType* sig_bt,
1757 const VMRegPair* regs) {
1758 ResourceMark rm;
1759 const int total_args_passed = method->size_of_parameters();
1760 const VMRegPair* regs_with_member_name = regs;
1761 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1762
1763 const int member_arg_pos = total_args_passed - 1;
1764 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1765 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1766
1767 java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1);
1768
1769 for (int i = 0; i < member_arg_pos; i++) {
1770 VMReg a = regs_with_member_name[i].first();
1771 VMReg b = regs_without_member_name[i].first();
1772 assert(a->value() == b->value(), "register allocation mismatch: a= %d, b= %d", a->value(), b->value());
1773 }
1774 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1775 }
1776 #endif
1777
1778 // ---------------------------------------------------------------------------
1779 // We are calling the interpreter via a c2i. Normally this would mean that
1780 // we were called by a compiled method. However we could have lost a race
1781 // where we went int -> i2c -> c2i and so the caller could in fact be
1782 // interpreted. If the caller is compiled we attempt to patch the caller
1783 // so he no longer calls into the interpreter.
1784 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1785 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1786
1787 // It's possible that deoptimization can occur at a call site which hasn't
1788 // been resolved yet, in which case this function will be called from
1789 // an nmethod that has been patched for deopt and we can ignore the
1790 // request for a fixup.
1791 // Also it is possible that we lost a race in that from_compiled_entry
1792 // is now back to the i2c in that case we don't need to patch and if
1793 // we did we'd leap into space because the callsite needs to use
1794 // "to interpreter" stub in order to load up the Method*. Don't
1795 // ask me how I know this...
1796
1797 // Result from nmethod::is_unloading is not stable across safepoints.
1798 NoSafepointVerifier nsv;
1799
1800 nmethod* callee = method->code();
1801 if (callee == nullptr) {
1802 return;
1803 }
1804
1805 // write lock needed because we might patch call site by set_to_clean()
1806 // and is_unloading() can modify nmethod's state
1807 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, JavaThread::current()));
1808
1809 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1810 if (cb == nullptr || !cb->is_nmethod() || !callee->is_in_use() || callee->is_unloading()) {
1811 return;
1812 }
1813
1814 // The check above makes sure this is an nmethod.
1815 nmethod* caller = cb->as_nmethod();
1816
1817 // Get the return PC for the passed caller PC.
1818 address return_pc = caller_pc + frame::pc_return_offset;
1819
1820 if (!caller->is_in_use() || !NativeCall::is_call_before(return_pc)) {
1821 return;
1822 }
1823
1824 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1825 CompiledICLocker ic_locker(caller);
1826 ResourceMark rm;
1827
1828 // If we got here through a static call or opt_virtual call, then we know where the
1829 // call address would be; let's peek at it
1830 address callsite_addr = (address)nativeCall_before(return_pc);
1831 RelocIterator iter(caller, callsite_addr, callsite_addr + 1);
1832 if (!iter.next()) {
1833 // No reloc entry found; not a static or optimized virtual call
1834 return;
1835 }
1836
1837 relocInfo::relocType type = iter.reloc()->type();
1838 if (type != relocInfo::static_call_type &&
1839 type != relocInfo::opt_virtual_call_type) {
1840 return;
1841 }
1842
1843 CompiledDirectCall* callsite = CompiledDirectCall::before(return_pc);
1844 callsite->set_to_clean();
1845 JRT_END
1846
1847
1848 // same as JVM_Arraycopy, but called directly from compiled code
1849 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1850 oopDesc* dest, jint dest_pos,
1851 jint length,
1852 JavaThread* current)) {
1853 #ifndef PRODUCT
1854 _slow_array_copy_ctr++;
1855 #endif
1856 // Check if we have null pointers
1857 if (src == nullptr || dest == nullptr) {
1858 THROW(vmSymbols::java_lang_NullPointerException());
1859 }
1860 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1861 // even though the copy_array API also performs dynamic checks to ensure
1862 // that src and dest are truly arrays (and are conformable).
1863 // The copy_array mechanism is awkward and could be removed, but
1864 // the compilers don't call this function except as a last resort,
1865 // so it probably doesn't matter.
1866 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1867 (arrayOopDesc*)dest, dest_pos,
1868 length, current);
1869 }
1870 JRT_END
1871
1872 // The caller of generate_class_cast_message() (or one of its callers)
1873 // must use a ResourceMark in order to correctly free the result.
1874 char* SharedRuntime::generate_class_cast_message(
1875 JavaThread* thread, Klass* caster_klass) {
1876
1877 // Get target class name from the checkcast instruction
1878 vframeStream vfst(thread, true);
1879 assert(!vfst.at_end(), "Java frame must exist");
1880 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1881 constantPoolHandle cpool(thread, vfst.method()->constants());
1882 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1883 Symbol* target_klass_name = nullptr;
1884 if (target_klass == nullptr) {
1885 // This klass should be resolved, but just in case, get the name in the klass slot.
1886 target_klass_name = cpool->klass_name_at(cc.index());
1887 }
1888 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1889 }
1890
1891
1892 // The caller of generate_class_cast_message() (or one of its callers)
1893 // must use a ResourceMark in order to correctly free the result.
1894 char* SharedRuntime::generate_class_cast_message(
1895 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1896 const char* caster_name = caster_klass->external_name();
1897
1898 assert(target_klass != nullptr || target_klass_name != nullptr, "one must be provided");
1899 const char* target_name = target_klass == nullptr ? target_klass_name->as_klass_external_name() :
1900 target_klass->external_name();
1901
1902 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
1903
1904 const char* caster_klass_description = "";
1905 const char* target_klass_description = "";
1906 const char* klass_separator = "";
1907 if (target_klass != nullptr && caster_klass->module() == target_klass->module()) {
1908 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
1909 } else {
1910 caster_klass_description = caster_klass->class_in_module_of_loader();
1911 target_klass_description = (target_klass != nullptr) ? target_klass->class_in_module_of_loader() : "";
1912 klass_separator = (target_klass != nullptr) ? "; " : "";
1913 }
1914
1915 // add 3 for parenthesis and preceding space
1916 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
1917
1918 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1919 if (message == nullptr) {
1920 // Shouldn't happen, but don't cause even more problems if it does
1921 message = const_cast<char*>(caster_klass->external_name());
1922 } else {
1923 jio_snprintf(message,
1924 msglen,
1925 "class %s cannot be cast to class %s (%s%s%s)",
1926 caster_name,
1927 target_name,
1928 caster_klass_description,
1929 klass_separator,
1930 target_klass_description
1931 );
1932 }
1933 return message;
1934 }
1935
1936 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1937 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
1938 JRT_END
1939
1940 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1941 if (!SafepointSynchronize::is_synchronizing()) {
1942 // Only try quick_enter() if we're not trying to reach a safepoint
1943 // so that the calling thread reaches the safepoint more quickly.
1944 if (ObjectSynchronizer::quick_enter(obj, lock, current)) {
1945 return;
1946 }
1947 }
1948 // NO_ASYNC required because an async exception on the state transition destructor
1949 // would leave you with the lock held and it would never be released.
1950 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1951 // and the model is that an exception implies the method failed.
1952 JRT_BLOCK_NO_ASYNC
1953 Handle h_obj(THREAD, obj);
1954 ObjectSynchronizer::enter(h_obj, lock, current);
1955 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1956 JRT_BLOCK_END
1957 }
1958
1959 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1960 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
1961 SharedRuntime::monitor_enter_helper(obj, lock, current);
1962 JRT_END
1963
1964 void SharedRuntime::monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1965 assert(JavaThread::current() == current, "invariant");
1966 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1967 ExceptionMark em(current);
1968
1969 // Check if C2_MacroAssembler::fast_unlock() or
1970 // C2_MacroAssembler::fast_unlock_lightweight() unlocked an inflated
1971 // monitor before going slow path. Since there is no safepoint
1972 // polling when calling into the VM, we can be sure that the monitor
1973 // hasn't been deallocated.
1974 ObjectMonitor* m = current->unlocked_inflated_monitor();
1975 if (m != nullptr) {
1976 assert(!m->has_owner(current), "must be");
1977 current->clear_unlocked_inflated_monitor();
1978
1979 // We need to reacquire the lock before we can call ObjectSynchronizer::exit().
1980 if (!m->try_enter(current, /*check_for_recursion*/ false)) {
1981 // Some other thread acquired the lock (or the monitor was
1982 // deflated). Either way we are done.
1983 current->dec_held_monitor_count();
1984 return;
1985 }
1986 }
1987
1988 // The object could become unlocked through a JNI call, which we have no other checks for.
1989 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
1990 if (obj->is_unlocked()) {
1991 if (CheckJNICalls) {
1992 fatal("Object has been unlocked by JNI");
1993 }
1994 return;
1995 }
1996 ObjectSynchronizer::exit(obj, lock, current);
1997 }
1998
1999 // Handles the uncommon cases of monitor unlocking in compiled code
2000 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
2001 assert(current == JavaThread::current(), "pre-condition");
2002 SharedRuntime::monitor_exit_helper(obj, lock, current);
2003 JRT_END
2004
2005 // This is only called when CheckJNICalls is true, and only
2006 // for virtual thread termination.
2007 JRT_LEAF(void, SharedRuntime::log_jni_monitor_still_held())
2008 assert(CheckJNICalls, "Only call this when checking JNI usage");
2009 if (log_is_enabled(Debug, jni)) {
2010 JavaThread* current = JavaThread::current();
2011 int64_t vthread_id = java_lang_Thread::thread_id(current->vthread());
2012 int64_t carrier_id = java_lang_Thread::thread_id(current->threadObj());
2013 log_debug(jni)("VirtualThread (tid: " INT64_FORMAT ", carrier id: " INT64_FORMAT
2014 ") exiting with Objects still locked by JNI MonitorEnter.",
2015 vthread_id, carrier_id);
2016 }
2017 JRT_END
2018
2019 #ifndef PRODUCT
2020
2021 void SharedRuntime::print_statistics() {
2022 ttyLocker ttyl;
2023 if (xtty != nullptr) xtty->head("statistics type='SharedRuntime'");
2024
2025 SharedRuntime::print_ic_miss_histogram();
2026
2027 // Dump the JRT_ENTRY counters
2028 if (_new_instance_ctr) tty->print_cr("%5u new instance requires GC", _new_instance_ctr);
2029 if (_new_array_ctr) tty->print_cr("%5u new array requires GC", _new_array_ctr);
2030 if (_multi2_ctr) tty->print_cr("%5u multianewarray 2 dim", _multi2_ctr);
2031 if (_multi3_ctr) tty->print_cr("%5u multianewarray 3 dim", _multi3_ctr);
2032 if (_multi4_ctr) tty->print_cr("%5u multianewarray 4 dim", _multi4_ctr);
2033 if (_multi5_ctr) tty->print_cr("%5u multianewarray 5 dim", _multi5_ctr);
2034
2035 tty->print_cr("%5u inline cache miss in compiled", _ic_miss_ctr);
2036 tty->print_cr("%5u wrong method", _wrong_method_ctr);
2037 tty->print_cr("%5u unresolved static call site", _resolve_static_ctr);
2038 tty->print_cr("%5u unresolved virtual call site", _resolve_virtual_ctr);
2039 tty->print_cr("%5u unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2040
2041 if (_mon_enter_stub_ctr) tty->print_cr("%5u monitor enter stub", _mon_enter_stub_ctr);
2042 if (_mon_exit_stub_ctr) tty->print_cr("%5u monitor exit stub", _mon_exit_stub_ctr);
2043 if (_mon_enter_ctr) tty->print_cr("%5u monitor enter slow", _mon_enter_ctr);
2044 if (_mon_exit_ctr) tty->print_cr("%5u monitor exit slow", _mon_exit_ctr);
2045 if (_partial_subtype_ctr) tty->print_cr("%5u slow partial subtype", _partial_subtype_ctr);
2046 if (_jbyte_array_copy_ctr) tty->print_cr("%5u byte array copies", _jbyte_array_copy_ctr);
2047 if (_jshort_array_copy_ctr) tty->print_cr("%5u short array copies", _jshort_array_copy_ctr);
2048 if (_jint_array_copy_ctr) tty->print_cr("%5u int array copies", _jint_array_copy_ctr);
2049 if (_jlong_array_copy_ctr) tty->print_cr("%5u long array copies", _jlong_array_copy_ctr);
2050 if (_oop_array_copy_ctr) tty->print_cr("%5u oop array copies", _oop_array_copy_ctr);
2051 if (_checkcast_array_copy_ctr) tty->print_cr("%5u checkcast array copies", _checkcast_array_copy_ctr);
2052 if (_unsafe_array_copy_ctr) tty->print_cr("%5u unsafe array copies", _unsafe_array_copy_ctr);
2053 if (_generic_array_copy_ctr) tty->print_cr("%5u generic array copies", _generic_array_copy_ctr);
2054 if (_slow_array_copy_ctr) tty->print_cr("%5u slow array copies", _slow_array_copy_ctr);
2055 if (_find_handler_ctr) tty->print_cr("%5u find exception handler", _find_handler_ctr);
2056 if (_rethrow_ctr) tty->print_cr("%5u rethrow handler", _rethrow_ctr);
2057 if (_unsafe_set_memory_ctr) tty->print_cr("%5u unsafe set memorys", _unsafe_set_memory_ctr);
2058
2059 AdapterHandlerLibrary::print_statistics();
2060
2061 if (xtty != nullptr) xtty->tail("statistics");
2062 }
2063
2064 inline double percent(int64_t x, int64_t y) {
2065 return 100.0 * (double)x / (double)MAX2(y, (int64_t)1);
2066 }
2067
2068 class MethodArityHistogram {
2069 public:
2070 enum { MAX_ARITY = 256 };
2071 private:
2072 static uint64_t _arity_histogram[MAX_ARITY]; // histogram of #args
2073 static uint64_t _size_histogram[MAX_ARITY]; // histogram of arg size in words
2074 static uint64_t _total_compiled_calls;
2075 static uint64_t _max_compiled_calls_per_method;
2076 static int _max_arity; // max. arity seen
2077 static int _max_size; // max. arg size seen
2078
2079 static void add_method_to_histogram(nmethod* nm) {
2080 Method* method = (nm == nullptr) ? nullptr : nm->method();
2081 if (method != nullptr) {
2082 ArgumentCount args(method->signature());
2083 int arity = args.size() + (method->is_static() ? 0 : 1);
2084 int argsize = method->size_of_parameters();
2085 arity = MIN2(arity, MAX_ARITY-1);
2086 argsize = MIN2(argsize, MAX_ARITY-1);
2087 uint64_t count = (uint64_t)method->compiled_invocation_count();
2088 _max_compiled_calls_per_method = count > _max_compiled_calls_per_method ? count : _max_compiled_calls_per_method;
2089 _total_compiled_calls += count;
2090 _arity_histogram[arity] += count;
2091 _size_histogram[argsize] += count;
2092 _max_arity = MAX2(_max_arity, arity);
2093 _max_size = MAX2(_max_size, argsize);
2094 }
2095 }
2096
2097 void print_histogram_helper(int n, uint64_t* histo, const char* name) {
2098 const int N = MIN2(9, n);
2099 double sum = 0;
2100 double weighted_sum = 0;
2101 for (int i = 0; i <= n; i++) { sum += (double)histo[i]; weighted_sum += (double)(i*histo[i]); }
2102 if (sum >= 1) { // prevent divide by zero or divide overflow
2103 double rest = sum;
2104 double percent = sum / 100;
2105 for (int i = 0; i <= N; i++) {
2106 rest -= (double)histo[i];
2107 tty->print_cr("%4d: " UINT64_FORMAT_W(12) " (%5.1f%%)", i, histo[i], (double)histo[i] / percent);
2108 }
2109 tty->print_cr("rest: " INT64_FORMAT_W(12) " (%5.1f%%)", (int64_t)rest, rest / percent);
2110 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2111 tty->print_cr("(total # of compiled calls = " INT64_FORMAT_W(14) ")", _total_compiled_calls);
2112 tty->print_cr("(max # of compiled calls = " INT64_FORMAT_W(14) ")", _max_compiled_calls_per_method);
2113 } else {
2114 tty->print_cr("Histogram generation failed for %s. n = %d, sum = %7.5f", name, n, sum);
2115 }
2116 }
2117
2118 void print_histogram() {
2119 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2120 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2121 tty->print_cr("\nHistogram of parameter block size (in words, incl. rcvr):");
2122 print_histogram_helper(_max_size, _size_histogram, "size");
2123 tty->cr();
2124 }
2125
2126 public:
2127 MethodArityHistogram() {
2128 // Take the Compile_lock to protect against changes in the CodeBlob structures
2129 MutexLocker mu1(Compile_lock, Mutex::_safepoint_check_flag);
2130 // Take the CodeCache_lock to protect against changes in the CodeHeap structure
2131 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2132 _max_arity = _max_size = 0;
2133 _total_compiled_calls = 0;
2134 _max_compiled_calls_per_method = 0;
2135 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2136 CodeCache::nmethods_do(add_method_to_histogram);
2137 print_histogram();
2138 }
2139 };
2140
2141 uint64_t MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2142 uint64_t MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2143 uint64_t MethodArityHistogram::_total_compiled_calls;
2144 uint64_t MethodArityHistogram::_max_compiled_calls_per_method;
2145 int MethodArityHistogram::_max_arity;
2146 int MethodArityHistogram::_max_size;
2147
2148 void SharedRuntime::print_call_statistics(uint64_t comp_total) {
2149 tty->print_cr("Calls from compiled code:");
2150 int64_t total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2151 int64_t mono_c = _nof_normal_calls - _nof_megamorphic_calls;
2152 int64_t mono_i = _nof_interface_calls;
2153 tty->print_cr("\t" INT64_FORMAT_W(12) " (100%%) total non-inlined ", total);
2154 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2155 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2156 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2157 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2158 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2159 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2160 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2161 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2162 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2163 tty->cr();
2164 tty->print_cr("Note 1: counter updates are not MT-safe.");
2165 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2166 tty->print_cr(" %% in nested categories are relative to their category");
2167 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2168 tty->cr();
2169
2170 MethodArityHistogram h;
2171 }
2172 #endif
2173
2174 #ifndef PRODUCT
2175 static int _lookups; // number of calls to lookup
2176 static int _equals; // number of buckets checked with matching hash
2177 static int _archived_hits; // number of successful lookups in archived table
2178 static int _runtime_hits; // number of successful lookups in runtime table
2179 #endif
2180
2181 // A simple wrapper class around the calling convention information
2182 // that allows sharing of adapters for the same calling convention.
2183 class AdapterFingerPrint : public MetaspaceObj {
2184 private:
2185 enum {
2186 _basic_type_bits = 4,
2187 _basic_type_mask = right_n_bits(_basic_type_bits),
2188 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2189 };
2190 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2191 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2192
2193 int _length;
2194
2195 static int data_offset() { return sizeof(AdapterFingerPrint); }
2196 int* data_pointer() {
2197 return (int*)((address)this + data_offset());
2198 }
2199
2200 // Private construtor. Use allocate() to get an instance.
2201 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt, int len) {
2202 int* data = data_pointer();
2203 // Pack the BasicTypes with 8 per int
2204 assert(len == length(total_args_passed), "sanity");
2205 _length = len;
2206 int sig_index = 0;
2207 for (int index = 0; index < _length; index++) {
2208 int value = 0;
2209 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2210 int bt = adapter_encoding(sig_bt[sig_index++]);
2211 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2212 value = (value << _basic_type_bits) | bt;
2213 }
2214 data[index] = value;
2215 }
2216 }
2217
2218 // Call deallocate instead
2219 ~AdapterFingerPrint() {
2220 ShouldNotCallThis();
2221 }
2222
2223 static int length(int total_args) {
2224 return (total_args + (_basic_types_per_int-1)) / _basic_types_per_int;
2225 }
2226
2227 static int compute_size_in_words(int len) {
2228 return (int)heap_word_size(sizeof(AdapterFingerPrint) + (len * sizeof(int)));
2229 }
2230
2231 // Remap BasicTypes that are handled equivalently by the adapters.
2232 // These are correct for the current system but someday it might be
2233 // necessary to make this mapping platform dependent.
2234 static int adapter_encoding(BasicType in) {
2235 switch (in) {
2236 case T_BOOLEAN:
2237 case T_BYTE:
2238 case T_SHORT:
2239 case T_CHAR:
2240 // There are all promoted to T_INT in the calling convention
2241 return T_INT;
2242
2243 case T_OBJECT:
2244 case T_ARRAY:
2245 // In other words, we assume that any register good enough for
2246 // an int or long is good enough for a managed pointer.
2247 #ifdef _LP64
2248 return T_LONG;
2249 #else
2250 return T_INT;
2251 #endif
2252
2253 case T_INT:
2254 case T_LONG:
2255 case T_FLOAT:
2256 case T_DOUBLE:
2257 case T_VOID:
2258 return in;
2259
2260 default:
2261 ShouldNotReachHere();
2262 return T_CONFLICT;
2263 }
2264 }
2265
2266 void* operator new(size_t size, size_t fp_size) throw() {
2267 assert(fp_size >= size, "sanity check");
2268 void* p = AllocateHeap(fp_size, mtCode);
2269 memset(p, 0, fp_size);
2270 return p;
2271 }
2272
2273 template<typename Function>
2274 void iterate_args(Function function) {
2275 for (int i = 0; i < length(); i++) {
2276 unsigned val = (unsigned)value(i);
2277 // args are packed so that first/lower arguments are in the highest
2278 // bits of each int value, so iterate from highest to the lowest
2279 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2280 unsigned v = (val >> j) & _basic_type_mask;
2281 if (v == 0) {
2282 continue;
2283 }
2284 function(v);
2285 }
2286 }
2287 }
2288
2289 public:
2290 static AdapterFingerPrint* allocate(int total_args_passed, BasicType* sig_bt) {
2291 int len = length(total_args_passed);
2292 int size_in_bytes = BytesPerWord * compute_size_in_words(len);
2293 AdapterFingerPrint* afp = new (size_in_bytes) AdapterFingerPrint(total_args_passed, sig_bt, len);
2294 assert((afp->size() * BytesPerWord) == size_in_bytes, "should match");
2295 return afp;
2296 }
2297
2298 static void deallocate(AdapterFingerPrint* fp) {
2299 FreeHeap(fp);
2300 }
2301
2302 int value(int index) {
2303 int* data = data_pointer();
2304 return data[index];
2305 }
2306
2307 int length() {
2308 return _length;
2309 }
2310
2311 unsigned int compute_hash() {
2312 int hash = 0;
2313 for (int i = 0; i < length(); i++) {
2314 int v = value(i);
2315 //Add arithmetic operation to the hash, like +3 to improve hashing
2316 hash = ((hash << 8) ^ v ^ (hash >> 5)) + 3;
2317 }
2318 return (unsigned int)hash;
2319 }
2320
2321 const char* as_string() {
2322 stringStream st;
2323 st.print("0x");
2324 for (int i = 0; i < length(); i++) {
2325 st.print("%x", value(i));
2326 }
2327 return st.as_string();
2328 }
2329
2330 const char* as_basic_args_string() {
2331 stringStream st;
2332 bool long_prev = false;
2333 iterate_args([&] (int arg) {
2334 if (long_prev) {
2335 long_prev = false;
2336 if (arg == T_VOID) {
2337 st.print("J");
2338 } else {
2339 st.print("L");
2340 }
2341 }
2342 switch (arg) {
2343 case T_INT: st.print("I"); break;
2344 case T_LONG: long_prev = true; break;
2345 case T_FLOAT: st.print("F"); break;
2346 case T_DOUBLE: st.print("D"); break;
2347 case T_VOID: break;
2348 default: ShouldNotReachHere();
2349 }
2350 });
2351 if (long_prev) {
2352 st.print("L");
2353 }
2354 return st.as_string();
2355 }
2356
2357 BasicType* as_basic_type(int& nargs) {
2358 nargs = 0;
2359 GrowableArray<BasicType> btarray;
2360 bool long_prev = false;
2361
2362 iterate_args([&] (int arg) {
2363 if (long_prev) {
2364 long_prev = false;
2365 if (arg == T_VOID) {
2366 btarray.append(T_LONG);
2367 } else {
2368 btarray.append(T_OBJECT); // it could be T_ARRAY; it shouldn't matter
2369 }
2370 }
2371 switch (arg) {
2372 case T_INT: // fallthrough
2373 case T_FLOAT: // fallthrough
2374 case T_DOUBLE:
2375 case T_VOID:
2376 btarray.append((BasicType)arg);
2377 break;
2378 case T_LONG:
2379 long_prev = true;
2380 break;
2381 default: ShouldNotReachHere();
2382 }
2383 });
2384
2385 if (long_prev) {
2386 btarray.append(T_OBJECT);
2387 }
2388
2389 nargs = btarray.length();
2390 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, nargs);
2391 int index = 0;
2392 GrowableArrayIterator<BasicType> iter = btarray.begin();
2393 while (iter != btarray.end()) {
2394 sig_bt[index++] = *iter;
2395 ++iter;
2396 }
2397 assert(index == btarray.length(), "sanity check");
2398 #ifdef ASSERT
2399 {
2400 AdapterFingerPrint* compare_fp = AdapterFingerPrint::allocate(nargs, sig_bt);
2401 assert(this->equals(compare_fp), "sanity check");
2402 AdapterFingerPrint::deallocate(compare_fp);
2403 }
2404 #endif
2405 return sig_bt;
2406 }
2407
2408 bool equals(AdapterFingerPrint* other) {
2409 if (other->_length != _length) {
2410 return false;
2411 } else {
2412 for (int i = 0; i < _length; i++) {
2413 if (value(i) != other->value(i)) {
2414 return false;
2415 }
2416 }
2417 }
2418 return true;
2419 }
2420
2421 // methods required by virtue of being a MetaspaceObj
2422 void metaspace_pointers_do(MetaspaceClosure* it) { return; /* nothing to do here */ }
2423 int size() const { return compute_size_in_words(_length); }
2424 MetaspaceObj::Type type() const { return AdapterFingerPrintType; }
2425
2426 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2427 NOT_PRODUCT(_equals++);
2428 return fp1->equals(fp2);
2429 }
2430
2431 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2432 return fp->compute_hash();
2433 }
2434 };
2435
2436 #if INCLUDE_CDS
2437 static inline bool adapter_fp_equals_compact_hashtable_entry(AdapterHandlerEntry* entry, AdapterFingerPrint* fp, int len_unused) {
2438 return AdapterFingerPrint::equals(entry->fingerprint(), fp);
2439 }
2440
2441 class ArchivedAdapterTable : public OffsetCompactHashtable<
2442 AdapterFingerPrint*,
2443 AdapterHandlerEntry*,
2444 adapter_fp_equals_compact_hashtable_entry> {};
2445 #endif // INCLUDE_CDS
2446
2447 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2448 using AdapterHandlerTable = ResourceHashtable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2449 AnyObj::C_HEAP, mtCode,
2450 AdapterFingerPrint::compute_hash,
2451 AdapterFingerPrint::equals>;
2452 static AdapterHandlerTable* _adapter_handler_table;
2453 static GrowableArray<AdapterHandlerEntry*>* _adapter_handler_list = nullptr;
2454
2455 // Find a entry with the same fingerprint if it exists
2456 AdapterHandlerEntry* AdapterHandlerLibrary::lookup(int total_args_passed, BasicType* sig_bt) {
2457 NOT_PRODUCT(_lookups++);
2458 assert_lock_strong(AdapterHandlerLibrary_lock);
2459 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(total_args_passed, sig_bt);
2460 AdapterHandlerEntry* entry = nullptr;
2461 #if INCLUDE_CDS
2462 // if we are building the archive then the archived adapter table is
2463 // not valid and we need to use the ones added to the runtime table
2464 if (AOTCodeCache::is_using_adapter()) {
2465 // Search archived table first. It is read-only table so can be searched without lock
2466 entry = _aot_adapter_handler_table.lookup(fp, fp->compute_hash(), 0 /* unused */);
2467 #ifndef PRODUCT
2468 if (entry != nullptr) {
2469 _archived_hits++;
2470 }
2471 #endif
2472 }
2473 #endif // INCLUDE_CDS
2474 if (entry == nullptr) {
2475 assert_lock_strong(AdapterHandlerLibrary_lock);
2476 AdapterHandlerEntry** entry_p = _adapter_handler_table->get(fp);
2477 if (entry_p != nullptr) {
2478 entry = *entry_p;
2479 assert(entry->fingerprint()->equals(fp), "fingerprint mismatch key fp %s %s (hash=%d) != found fp %s %s (hash=%d)",
2480 entry->fingerprint()->as_basic_args_string(), entry->fingerprint()->as_string(), entry->fingerprint()->compute_hash(),
2481 fp->as_basic_args_string(), fp->as_string(), fp->compute_hash());
2482 #ifndef PRODUCT
2483 _runtime_hits++;
2484 #endif
2485 }
2486 }
2487 AdapterFingerPrint::deallocate(fp);
2488 return entry;
2489 }
2490
2491 #ifndef PRODUCT
2492 static void print_table_statistics() {
2493 auto size = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2494 return sizeof(*key) + sizeof(*a);
2495 };
2496 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2497 ts.print(tty, "AdapterHandlerTable");
2498 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2499 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2500 int total_hits = _archived_hits + _runtime_hits;
2501 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d (archived=%d+runtime=%d)",
2502 _lookups, _equals, total_hits, _archived_hits, _runtime_hits);
2503 }
2504 #endif
2505
2506 // ---------------------------------------------------------------------------
2507 // Implementation of AdapterHandlerLibrary
2508 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = nullptr;
2509 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2510 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2511 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2512 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2513 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2514 #if INCLUDE_CDS
2515 ArchivedAdapterTable AdapterHandlerLibrary::_aot_adapter_handler_table;
2516 #endif // INCLUDE_CDS
2517 static const int AdapterHandlerLibrary_size = 16*K;
2518 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2519
2520 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2521 assert(_buffer != nullptr, "should be initialized");
2522 return _buffer;
2523 }
2524
2525 static void post_adapter_creation(const AdapterBlob* new_adapter,
2526 const AdapterHandlerEntry* entry) {
2527 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2528 char blob_id[256];
2529 jio_snprintf(blob_id,
2530 sizeof(blob_id),
2531 "%s(%s)",
2532 new_adapter->name(),
2533 entry->fingerprint()->as_string());
2534 if (Forte::is_enabled()) {
2535 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2536 }
2537
2538 if (JvmtiExport::should_post_dynamic_code_generated()) {
2539 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2540 }
2541 }
2542 }
2543
2544 void AdapterHandlerLibrary::create_abstract_method_handler() {
2545 assert_lock_strong(AdapterHandlerLibrary_lock);
2546 // Create a special handler for abstract methods. Abstract methods
2547 // are never compiled so an i2c entry is somewhat meaningless, but
2548 // throw AbstractMethodError just in case.
2549 // Pass wrong_method_abstract for the c2i transitions to return
2550 // AbstractMethodError for invalid invocations.
2551 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2552 _abstract_method_handler = AdapterHandlerLibrary::new_entry(AdapterFingerPrint::allocate(0, nullptr));
2553 _abstract_method_handler->set_entry_points(SharedRuntime::throw_AbstractMethodError_entry(),
2554 wrong_method_abstract,
2555 wrong_method_abstract,
2556 nullptr);
2557 }
2558
2559 void AdapterHandlerLibrary::initialize() {
2560 {
2561 ResourceMark rm;
2562 MutexLocker mu(AdapterHandlerLibrary_lock);
2563 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2564 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2565 create_abstract_method_handler();
2566 }
2567
2568 #if INCLUDE_CDS
2569 // Link adapters in AOT Cache to their code in AOT Code Cache
2570 if (AOTCodeCache::is_using_adapter() && !_aot_adapter_handler_table.empty()) {
2571 link_aot_adapters();
2572 lookup_simple_adapters();
2573 return;
2574 }
2575 #endif // INCLUDE_CDS
2576
2577 ResourceMark rm;
2578 AdapterBlob* no_arg_blob = nullptr;
2579 AdapterBlob* int_arg_blob = nullptr;
2580 AdapterBlob* obj_arg_blob = nullptr;
2581 AdapterBlob* obj_int_arg_blob = nullptr;
2582 AdapterBlob* obj_obj_arg_blob = nullptr;
2583 {
2584 MutexLocker mu(AdapterHandlerLibrary_lock);
2585
2586 _no_arg_handler = create_adapter(no_arg_blob, 0, nullptr);
2587
2588 BasicType obj_args[] = { T_OBJECT };
2589 _obj_arg_handler = create_adapter(obj_arg_blob, 1, obj_args);
2590
2591 BasicType int_args[] = { T_INT };
2592 _int_arg_handler = create_adapter(int_arg_blob, 1, int_args);
2593
2594 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2595 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, 2, obj_int_args);
2596
2597 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2598 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, 2, obj_obj_args);
2599
2600 assert(no_arg_blob != nullptr &&
2601 obj_arg_blob != nullptr &&
2602 int_arg_blob != nullptr &&
2603 obj_int_arg_blob != nullptr &&
2604 obj_obj_arg_blob != nullptr, "Initial adapters must be properly created");
2605 }
2606
2607 // Outside of the lock
2608 post_adapter_creation(no_arg_blob, _no_arg_handler);
2609 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2610 post_adapter_creation(int_arg_blob, _int_arg_handler);
2611 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2612 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2613 }
2614
2615 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint) {
2616 return AdapterHandlerEntry::allocate(fingerprint);
2617 }
2618
2619 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2620 if (method->is_abstract()) {
2621 return _abstract_method_handler;
2622 }
2623 int total_args_passed = method->size_of_parameters(); // All args on stack
2624 if (total_args_passed == 0) {
2625 return _no_arg_handler;
2626 } else if (total_args_passed == 1) {
2627 if (!method->is_static()) {
2628 return _obj_arg_handler;
2629 }
2630 switch (method->signature()->char_at(1)) {
2631 case JVM_SIGNATURE_CLASS:
2632 case JVM_SIGNATURE_ARRAY:
2633 return _obj_arg_handler;
2634 case JVM_SIGNATURE_INT:
2635 case JVM_SIGNATURE_BOOLEAN:
2636 case JVM_SIGNATURE_CHAR:
2637 case JVM_SIGNATURE_BYTE:
2638 case JVM_SIGNATURE_SHORT:
2639 return _int_arg_handler;
2640 }
2641 } else if (total_args_passed == 2 &&
2642 !method->is_static()) {
2643 switch (method->signature()->char_at(1)) {
2644 case JVM_SIGNATURE_CLASS:
2645 case JVM_SIGNATURE_ARRAY:
2646 return _obj_obj_arg_handler;
2647 case JVM_SIGNATURE_INT:
2648 case JVM_SIGNATURE_BOOLEAN:
2649 case JVM_SIGNATURE_CHAR:
2650 case JVM_SIGNATURE_BYTE:
2651 case JVM_SIGNATURE_SHORT:
2652 return _obj_int_arg_handler;
2653 }
2654 }
2655 return nullptr;
2656 }
2657
2658 class AdapterSignatureIterator : public SignatureIterator {
2659 private:
2660 BasicType stack_sig_bt[16];
2661 BasicType* sig_bt;
2662 int index;
2663
2664 public:
2665 AdapterSignatureIterator(Symbol* signature,
2666 fingerprint_t fingerprint,
2667 bool is_static,
2668 int total_args_passed) :
2669 SignatureIterator(signature, fingerprint),
2670 index(0)
2671 {
2672 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2673 if (!is_static) { // Pass in receiver first
2674 sig_bt[index++] = T_OBJECT;
2675 }
2676 do_parameters_on(this);
2677 }
2678
2679 BasicType* basic_types() {
2680 return sig_bt;
2681 }
2682
2683 #ifdef ASSERT
2684 int slots() {
2685 return index;
2686 }
2687 #endif
2688
2689 private:
2690
2691 friend class SignatureIterator; // so do_parameters_on can call do_type
2692 void do_type(BasicType type) {
2693 sig_bt[index++] = type;
2694 if (type == T_LONG || type == T_DOUBLE) {
2695 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2696 }
2697 }
2698 };
2699
2700
2701 const char* AdapterHandlerEntry::_entry_names[] = {
2702 "i2c", "c2i", "c2i_unverified", "c2i_no_clinit_check"
2703 };
2704
2705 #ifdef ASSERT
2706 void AdapterHandlerLibrary::verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached_entry) {
2707 AdapterBlob* comparison_blob = nullptr;
2708 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, total_args_passed, sig_bt, true);
2709 assert(comparison_blob == nullptr, "no blob should be created when creating an adapter for comparison");
2710 assert(comparison_entry->compare_code(cached_entry), "code must match");
2711 // Release the one just created
2712 AdapterHandlerEntry::deallocate(comparison_entry);
2713 }
2714 #endif /* ASSERT*/
2715
2716 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2717 // Use customized signature handler. Need to lock around updates to
2718 // the _adapter_handler_table (it is not safe for concurrent readers
2719 // and a single writer: this could be fixed if it becomes a
2720 // problem).
2721
2722 // Fast-path for trivial adapters
2723 AdapterHandlerEntry* entry = get_simple_adapter(method);
2724 if (entry != nullptr) {
2725 return entry;
2726 }
2727
2728 ResourceMark rm;
2729 AdapterBlob* adapter_blob = nullptr;
2730
2731 // Fill in the signature array, for the calling-convention call.
2732 int total_args_passed = method->size_of_parameters(); // All args on stack
2733
2734 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2735 method->is_static(), total_args_passed);
2736 assert(si.slots() == total_args_passed, "");
2737 BasicType* sig_bt = si.basic_types();
2738 {
2739 MutexLocker mu(AdapterHandlerLibrary_lock);
2740
2741 // Lookup method signature's fingerprint
2742 entry = lookup(total_args_passed, sig_bt);
2743
2744 if (entry != nullptr) {
2745 assert(entry->is_linked(), "AdapterHandlerEntry must have been linked");
2746 #ifdef ASSERT
2747 if (!entry->is_shared() && VerifyAdapterSharing) {
2748 verify_adapter_sharing(total_args_passed, sig_bt, entry);
2749 }
2750 #endif
2751 } else {
2752 entry = create_adapter(adapter_blob, total_args_passed, sig_bt);
2753 }
2754 }
2755
2756 // Outside of the lock
2757 if (adapter_blob != nullptr) {
2758 post_adapter_creation(adapter_blob, entry);
2759 }
2760 return entry;
2761 }
2762
2763 AdapterBlob* AdapterHandlerLibrary::lookup_aot_cache(AdapterHandlerEntry* handler) {
2764 ResourceMark rm;
2765 const char* name = AdapterHandlerLibrary::name(handler->fingerprint());
2766 const uint32_t id = AdapterHandlerLibrary::id(handler->fingerprint());
2767 int offsets[AdapterHandlerEntry::ENTRIES_COUNT];
2768
2769 AdapterBlob* adapter_blob = nullptr;
2770 CodeBlob* blob = AOTCodeCache::load_code_blob(AOTCodeEntry::Adapter, id, name, AdapterHandlerEntry::ENTRIES_COUNT, offsets);
2771 if (blob != nullptr) {
2772 adapter_blob = blob->as_adapter_blob();
2773 address i2c_entry = adapter_blob->content_begin();
2774 assert(offsets[0] == 0, "sanity check");
2775 handler->set_entry_points(i2c_entry, i2c_entry + offsets[1], i2c_entry + offsets[2], i2c_entry + offsets[3]);
2776 }
2777 return adapter_blob;
2778 }
2779
2780 #ifndef PRODUCT
2781 void AdapterHandlerLibrary::print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob) {
2782 ttyLocker ttyl;
2783 ResourceMark rm;
2784 int insts_size = adapter_blob->code_size();
2785 handler->print_adapter_on(tty);
2786 st->print_cr("i2c argument handler for: %s %s (%d bytes generated)",
2787 handler->fingerprint()->as_basic_args_string(),
2788 handler->fingerprint()->as_string(), insts_size);
2789 st->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(handler->get_c2i_entry()));
2790 if (Verbose || PrintStubCode) {
2791 address first_pc = handler->base_address();
2792 if (first_pc != nullptr) {
2793 Disassembler::decode(first_pc, first_pc + insts_size, st, &adapter_blob->asm_remarks());
2794 st->cr();
2795 }
2796 }
2797 }
2798 #endif // PRODUCT
2799
2800 bool AdapterHandlerLibrary::generate_adapter_code(AdapterBlob*& adapter_blob,
2801 AdapterHandlerEntry* handler,
2802 int total_args_passed,
2803 BasicType* sig_bt,
2804 bool is_transient) {
2805 if (log_is_enabled(Info, perf, class, link)) {
2806 ClassLoader::perf_method_adapters_count()->inc();
2807 }
2808
2809 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2810 CodeBuffer buffer(buf);
2811 short buffer_locs[20];
2812 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2813 sizeof(buffer_locs)/sizeof(relocInfo));
2814 MacroAssembler masm(&buffer);
2815 VMRegPair stack_regs[16];
2816 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2817
2818 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2819 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2820 SharedRuntime::generate_i2c2i_adapters(&masm,
2821 total_args_passed,
2822 comp_args_on_stack,
2823 sig_bt,
2824 regs,
2825 handler);
2826 #ifdef ASSERT
2827 if (VerifyAdapterSharing) {
2828 handler->save_code(buf->code_begin(), buffer.insts_size());
2829 if (is_transient) {
2830 return true;
2831 }
2832 }
2833 #endif
2834
2835 adapter_blob = AdapterBlob::create(&buffer);
2836 if (adapter_blob == nullptr) {
2837 // CodeCache is full, disable compilation
2838 // Ought to log this but compile log is only per compile thread
2839 // and we're some non descript Java thread.
2840 return false;
2841 }
2842 if (!is_transient && AOTCodeCache::is_dumping_adapter()) {
2843 // try to save generated code
2844 const char* name = AdapterHandlerLibrary::name(handler->fingerprint());
2845 const uint32_t id = AdapterHandlerLibrary::id(handler->fingerprint());
2846 int entry_offset[AdapterHandlerEntry::ENTRIES_COUNT];
2847 assert(AdapterHandlerEntry::ENTRIES_COUNT == 4, "sanity");
2848 address i2c_entry = handler->get_i2c_entry();
2849 entry_offset[0] = 0; // i2c_entry offset
2850 entry_offset[1] = handler->get_c2i_entry() - i2c_entry;
2851 entry_offset[2] = handler->get_c2i_unverified_entry() - i2c_entry;
2852 entry_offset[3] = handler->get_c2i_no_clinit_check_entry() - i2c_entry;
2853 bool success = AOTCodeCache::store_code_blob(*adapter_blob, AOTCodeEntry::Adapter, id, name, AdapterHandlerEntry::ENTRIES_COUNT, entry_offset);
2854 assert(success || !AOTCodeCache::is_dumping_adapter(), "caching of adapter must be disabled");
2855 }
2856 handler->relocate(adapter_blob->content_begin());
2857 #ifndef PRODUCT
2858 // debugging support
2859 if (PrintAdapterHandlers || PrintStubCode) {
2860 print_adapter_handler_info(tty, handler, adapter_blob);
2861 }
2862 #endif
2863 return true;
2864 }
2865
2866 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& adapter_blob,
2867 int total_args_passed,
2868 BasicType* sig_bt,
2869 bool is_transient) {
2870 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(total_args_passed, sig_bt);
2871 AdapterHandlerEntry* handler = AdapterHandlerLibrary::new_entry(fp);
2872 if (!generate_adapter_code(adapter_blob, handler, total_args_passed, sig_bt, is_transient)) {
2873 AdapterHandlerEntry::deallocate(handler);
2874 return nullptr;
2875 }
2876 if (!is_transient) {
2877 assert_lock_strong(AdapterHandlerLibrary_lock);
2878 _adapter_handler_table->put(fp, handler);
2879 }
2880 return handler;
2881 }
2882
2883 #if INCLUDE_CDS
2884 void AdapterHandlerEntry::remove_unshareable_info() {
2885 #ifdef ASSERT
2886 _saved_code = nullptr;
2887 _saved_code_length = 0;
2888 #endif // ASSERT
2889 set_entry_points(nullptr, nullptr, nullptr, nullptr, false);
2890 }
2891
2892 class CopyAdapterTableToArchive : StackObj {
2893 private:
2894 CompactHashtableWriter* _writer;
2895 ArchiveBuilder* _builder;
2896 public:
2897 CopyAdapterTableToArchive(CompactHashtableWriter* writer) : _writer(writer),
2898 _builder(ArchiveBuilder::current())
2899 {}
2900
2901 bool do_entry(AdapterFingerPrint* fp, AdapterHandlerEntry* entry) {
2902 LogStreamHandle(Trace, aot) lsh;
2903 if (ArchiveBuilder::current()->has_been_archived((address)entry)) {
2904 assert(ArchiveBuilder::current()->has_been_archived((address)fp), "must be");
2905 AdapterFingerPrint* buffered_fp = ArchiveBuilder::current()->get_buffered_addr(fp);
2906 assert(buffered_fp != nullptr,"sanity check");
2907 AdapterHandlerEntry* buffered_entry = ArchiveBuilder::current()->get_buffered_addr(entry);
2908 assert(buffered_entry != nullptr,"sanity check");
2909
2910 uint hash = fp->compute_hash();
2911 u4 delta = _builder->buffer_to_offset_u4((address)buffered_entry);
2912 _writer->add(hash, delta);
2913 if (lsh.is_enabled()) {
2914 address fp_runtime_addr = (address)buffered_fp + ArchiveBuilder::current()->buffer_to_requested_delta();
2915 address entry_runtime_addr = (address)buffered_entry + ArchiveBuilder::current()->buffer_to_requested_delta();
2916 log_trace(aot)("Added fp=%p (%s), entry=%p to the archived adater table", buffered_fp, buffered_fp->as_basic_args_string(), buffered_entry);
2917 }
2918 } else {
2919 if (lsh.is_enabled()) {
2920 log_trace(aot)("Skipping adapter handler %p (fp=%s) as it is not archived", entry, fp->as_basic_args_string());
2921 }
2922 }
2923 return true;
2924 }
2925 };
2926
2927 void AdapterHandlerLibrary::dump_aot_adapter_table() {
2928 CompactHashtableStats stats;
2929 CompactHashtableWriter writer(_adapter_handler_table->number_of_entries(), &stats);
2930 CopyAdapterTableToArchive copy(&writer);
2931 _adapter_handler_table->iterate(©);
2932 writer.dump(&_aot_adapter_handler_table, "archived adapter table");
2933 }
2934
2935 void AdapterHandlerLibrary::serialize_shared_table_header(SerializeClosure* soc) {
2936 _aot_adapter_handler_table.serialize_header(soc);
2937 }
2938
2939 AdapterBlob* AdapterHandlerLibrary::link_aot_adapter_handler(AdapterHandlerEntry* handler) {
2940 #ifdef ASSERT
2941 if (TestAOTAdapterLinkFailure) {
2942 return nullptr;
2943 }
2944 #endif
2945 AdapterBlob* blob = lookup_aot_cache(handler);
2946 #ifndef PRODUCT
2947 // debugging support
2948 if ((blob != nullptr) && (PrintAdapterHandlers || PrintStubCode)) {
2949 print_adapter_handler_info(tty, handler, blob);
2950 }
2951 #endif
2952 return blob;
2953 }
2954
2955 // This method is used during production run to link archived adapters (stored in AOT Cache)
2956 // to their code in AOT Code Cache
2957 void AdapterHandlerEntry::link() {
2958 AdapterBlob* adapter_blob = nullptr;
2959 ResourceMark rm;
2960 assert(_fingerprint != nullptr, "_fingerprint must not be null");
2961 bool generate_code = false;
2962 // Generate code only if AOTCodeCache is not available, or
2963 // caching adapters is disabled, or we fail to link
2964 // the AdapterHandlerEntry to its code in the AOTCodeCache
2965 if (AOTCodeCache::is_using_adapter()) {
2966 adapter_blob = AdapterHandlerLibrary::link_aot_adapter_handler(this);
2967 if (adapter_blob == nullptr) {
2968 log_warning(aot)("Failed to link AdapterHandlerEntry (fp=%s) to its code in the AOT code cache", _fingerprint->as_basic_args_string());
2969 generate_code = true;
2970 }
2971 } else {
2972 generate_code = true;
2973 }
2974 if (generate_code) {
2975 int nargs;
2976 BasicType* bt = _fingerprint->as_basic_type(nargs);
2977 if (!AdapterHandlerLibrary::generate_adapter_code(adapter_blob, this, nargs, bt, /* is_transient */ false)) {
2978 // Don't throw exceptions during VM initialization because java.lang.* classes
2979 // might not have been initialized, causing problems when constructing the
2980 // Java exception object.
2981 vm_exit_during_initialization("Out of space in CodeCache for adapters");
2982 }
2983 }
2984 // Outside of the lock
2985 if (adapter_blob != nullptr) {
2986 post_adapter_creation(adapter_blob, this);
2987 }
2988 assert(_linked, "AdapterHandlerEntry must now be linked");
2989 }
2990
2991 void AdapterHandlerLibrary::link_aot_adapters() {
2992 assert(AOTCodeCache::is_using_adapter(), "AOT adapters code should be available");
2993 _aot_adapter_handler_table.iterate([](AdapterHandlerEntry* entry) {
2994 assert(!entry->is_linked(), "AdapterHandlerEntry is already linked!");
2995 entry->link();
2996 });
2997 }
2998
2999 // This method is called during production run to lookup simple adapters
3000 // in the archived adapter handler table
3001 void AdapterHandlerLibrary::lookup_simple_adapters() {
3002 assert(!_aot_adapter_handler_table.empty(), "archived adapter handler table is empty");
3003
3004 MutexLocker mu(AdapterHandlerLibrary_lock);
3005 _no_arg_handler = lookup(0, nullptr);
3006
3007 BasicType obj_args[] = { T_OBJECT };
3008 _obj_arg_handler = lookup(1, obj_args);
3009
3010 BasicType int_args[] = { T_INT };
3011 _int_arg_handler = lookup(1, int_args);
3012
3013 BasicType obj_int_args[] = { T_OBJECT, T_INT };
3014 _obj_int_arg_handler = lookup(2, obj_int_args);
3015
3016 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
3017 _obj_obj_arg_handler = lookup(2, obj_obj_args);
3018
3019 assert(_no_arg_handler != nullptr &&
3020 _obj_arg_handler != nullptr &&
3021 _int_arg_handler != nullptr &&
3022 _obj_int_arg_handler != nullptr &&
3023 _obj_obj_arg_handler != nullptr, "Initial adapters not found in archived adapter handler table");
3024 assert(_no_arg_handler->is_linked() &&
3025 _obj_arg_handler->is_linked() &&
3026 _int_arg_handler->is_linked() &&
3027 _obj_int_arg_handler->is_linked() &&
3028 _obj_obj_arg_handler->is_linked(), "Initial adapters not in linked state");
3029 }
3030 #endif // INCLUDE_CDS
3031
3032 address AdapterHandlerEntry::base_address() {
3033 address base = _i2c_entry;
3034 if (base == nullptr) base = _c2i_entry;
3035 assert(base <= _c2i_entry || _c2i_entry == nullptr, "");
3036 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == nullptr, "");
3037 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == nullptr, "");
3038 return base;
3039 }
3040
3041 void AdapterHandlerEntry::relocate(address new_base) {
3042 address old_base = base_address();
3043 assert(old_base != nullptr, "");
3044 ptrdiff_t delta = new_base - old_base;
3045 if (_i2c_entry != nullptr)
3046 _i2c_entry += delta;
3047 if (_c2i_entry != nullptr)
3048 _c2i_entry += delta;
3049 if (_c2i_unverified_entry != nullptr)
3050 _c2i_unverified_entry += delta;
3051 if (_c2i_no_clinit_check_entry != nullptr)
3052 _c2i_no_clinit_check_entry += delta;
3053 assert(base_address() == new_base, "");
3054 }
3055
3056 void AdapterHandlerEntry::metaspace_pointers_do(MetaspaceClosure* it) {
3057 LogStreamHandle(Trace, aot) lsh;
3058 if (lsh.is_enabled()) {
3059 lsh.print("Iter(AdapterHandlerEntry): %p(%s)", this, _fingerprint->as_basic_args_string());
3060 lsh.cr();
3061 }
3062 it->push(&_fingerprint);
3063 }
3064
3065 AdapterHandlerEntry::~AdapterHandlerEntry() {
3066 if (_fingerprint != nullptr) {
3067 AdapterFingerPrint::deallocate(_fingerprint);
3068 _fingerprint = nullptr;
3069 }
3070 #ifdef ASSERT
3071 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3072 #endif
3073 FreeHeap(this);
3074 }
3075
3076
3077 #ifdef ASSERT
3078 // Capture the code before relocation so that it can be compared
3079 // against other versions. If the code is captured after relocation
3080 // then relative instructions won't be equivalent.
3081 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3082 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3083 _saved_code_length = length;
3084 memcpy(_saved_code, buffer, length);
3085 }
3086
3087
3088 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
3089 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
3090
3091 if (other->_saved_code_length != _saved_code_length) {
3092 return false;
3093 }
3094
3095 return memcmp(other->_saved_code, _saved_code, _saved_code_length) == 0;
3096 }
3097 #endif
3098
3099
3100 /**
3101 * Create a native wrapper for this native method. The wrapper converts the
3102 * Java-compiled calling convention to the native convention, handles
3103 * arguments, and transitions to native. On return from the native we transition
3104 * back to java blocking if a safepoint is in progress.
3105 */
3106 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
3107 ResourceMark rm;
3108 nmethod* nm = nullptr;
3109
3110 // Check if memory should be freed before allocation
3111 CodeCache::gc_on_allocation();
3112
3113 assert(method->is_native(), "must be native");
3114 assert(method->is_special_native_intrinsic() ||
3115 method->has_native_function(), "must have something valid to call!");
3116
3117 {
3118 // Perform the work while holding the lock, but perform any printing outside the lock
3119 MutexLocker mu(AdapterHandlerLibrary_lock);
3120 // See if somebody beat us to it
3121 if (method->code() != nullptr) {
3122 return;
3123 }
3124
3125 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
3126 assert(compile_id > 0, "Must generate native wrapper");
3127
3128
3129 ResourceMark rm;
3130 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3131 if (buf != nullptr) {
3132 CodeBuffer buffer(buf);
3133
3134 if (method->is_continuation_enter_intrinsic()) {
3135 buffer.initialize_stubs_size(192);
3136 }
3137
3138 struct { double data[20]; } locs_buf;
3139 struct { double data[20]; } stubs_locs_buf;
3140 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3141 #if defined(AARCH64) || defined(PPC64)
3142 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3143 // in the constant pool to ensure ordering between the barrier and oops
3144 // accesses. For native_wrappers we need a constant.
3145 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
3146 // static java call that is resolved in the runtime.
3147 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
3148 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
3149 }
3150 #endif
3151 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
3152 MacroAssembler _masm(&buffer);
3153
3154 // Fill in the signature array, for the calling-convention call.
3155 const int total_args_passed = method->size_of_parameters();
3156
3157 VMRegPair stack_regs[16];
3158 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3159
3160 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
3161 method->is_static(), total_args_passed);
3162 BasicType* sig_bt = si.basic_types();
3163 assert(si.slots() == total_args_passed, "");
3164 BasicType ret_type = si.return_type();
3165
3166 // Now get the compiled-Java arguments layout.
3167 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3168
3169 // Generate the compiled-to-native wrapper code
3170 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3171
3172 if (nm != nullptr) {
3173 {
3174 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
3175 if (nm->make_in_use()) {
3176 method->set_code(method, nm);
3177 }
3178 }
3179
3180 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
3181 if (directive->PrintAssemblyOption) {
3182 nm->print_code();
3183 }
3184 DirectivesStack::release(directive);
3185 }
3186 }
3187 } // Unlock AdapterHandlerLibrary_lock
3188
3189
3190 // Install the generated code.
3191 if (nm != nullptr) {
3192 const char *msg = method->is_static() ? "(static)" : "";
3193 CompileTask::print_ul(nm, msg);
3194 if (PrintCompilation) {
3195 ttyLocker ttyl;
3196 CompileTask::print(tty, nm, msg);
3197 }
3198 nm->post_compiled_method_load_event();
3199 }
3200 }
3201
3202 // -------------------------------------------------------------------------
3203 // Java-Java calling convention
3204 // (what you use when Java calls Java)
3205
3206 //------------------------------name_for_receiver----------------------------------
3207 // For a given signature, return the VMReg for parameter 0.
3208 VMReg SharedRuntime::name_for_receiver() {
3209 VMRegPair regs;
3210 BasicType sig_bt = T_OBJECT;
3211 (void) java_calling_convention(&sig_bt, ®s, 1);
3212 // Return argument 0 register. In the LP64 build pointers
3213 // take 2 registers, but the VM wants only the 'main' name.
3214 return regs.first();
3215 }
3216
3217 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
3218 // This method is returning a data structure allocating as a
3219 // ResourceObject, so do not put any ResourceMarks in here.
3220
3221 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
3222 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
3223 int cnt = 0;
3224 if (has_receiver) {
3225 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
3226 }
3227
3228 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
3229 BasicType type = ss.type();
3230 sig_bt[cnt++] = type;
3231 if (is_double_word_type(type))
3232 sig_bt[cnt++] = T_VOID;
3233 }
3234
3235 if (has_appendix) {
3236 sig_bt[cnt++] = T_OBJECT;
3237 }
3238
3239 assert(cnt < 256, "grow table size");
3240
3241 int comp_args_on_stack;
3242 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt);
3243
3244 // the calling convention doesn't count out_preserve_stack_slots so
3245 // we must add that in to get "true" stack offsets.
3246
3247 if (comp_args_on_stack) {
3248 for (int i = 0; i < cnt; i++) {
3249 VMReg reg1 = regs[i].first();
3250 if (reg1->is_stack()) {
3251 // Yuck
3252 reg1 = reg1->bias(out_preserve_stack_slots());
3253 }
3254 VMReg reg2 = regs[i].second();
3255 if (reg2->is_stack()) {
3256 // Yuck
3257 reg2 = reg2->bias(out_preserve_stack_slots());
3258 }
3259 regs[i].set_pair(reg2, reg1);
3260 }
3261 }
3262
3263 // results
3264 *arg_size = cnt;
3265 return regs;
3266 }
3267
3268 // OSR Migration Code
3269 //
3270 // This code is used convert interpreter frames into compiled frames. It is
3271 // called from very start of a compiled OSR nmethod. A temp array is
3272 // allocated to hold the interesting bits of the interpreter frame. All
3273 // active locks are inflated to allow them to move. The displaced headers and
3274 // active interpreter locals are copied into the temp buffer. Then we return
3275 // back to the compiled code. The compiled code then pops the current
3276 // interpreter frame off the stack and pushes a new compiled frame. Then it
3277 // copies the interpreter locals and displaced headers where it wants.
3278 // Finally it calls back to free the temp buffer.
3279 //
3280 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3281
3282 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *current) )
3283 assert(current == JavaThread::current(), "pre-condition");
3284 JFR_ONLY(Jfr::check_and_process_sample_request(current);)
3285 // During OSR migration, we unwind the interpreted frame and replace it with a compiled
3286 // frame. The stack watermark code below ensures that the interpreted frame is processed
3287 // before it gets unwound. This is helpful as the size of the compiled frame could be
3288 // larger than the interpreted frame, which could result in the new frame not being
3289 // processed correctly.
3290 StackWatermarkSet::before_unwind(current);
3291
3292 //
3293 // This code is dependent on the memory layout of the interpreter local
3294 // array and the monitors. On all of our platforms the layout is identical
3295 // so this code is shared. If some platform lays the their arrays out
3296 // differently then this code could move to platform specific code or
3297 // the code here could be modified to copy items one at a time using
3298 // frame accessor methods and be platform independent.
3299
3300 frame fr = current->last_frame();
3301 assert(fr.is_interpreted_frame(), "");
3302 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3303
3304 // Figure out how many monitors are active.
3305 int active_monitor_count = 0;
3306 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3307 kptr < fr.interpreter_frame_monitor_begin();
3308 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3309 if (kptr->obj() != nullptr) active_monitor_count++;
3310 }
3311
3312 // QQQ we could place number of active monitors in the array so that compiled code
3313 // could double check it.
3314
3315 Method* moop = fr.interpreter_frame_method();
3316 int max_locals = moop->max_locals();
3317 // Allocate temp buffer, 1 word per local & 2 per active monitor
3318 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3319 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3320
3321 // Copy the locals. Order is preserved so that loading of longs works.
3322 // Since there's no GC I can copy the oops blindly.
3323 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3324 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3325 (HeapWord*)&buf[0],
3326 max_locals);
3327
3328 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3329 int i = max_locals;
3330 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3331 kptr2 < fr.interpreter_frame_monitor_begin();
3332 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3333 if (kptr2->obj() != nullptr) { // Avoid 'holes' in the monitor array
3334 BasicLock *lock = kptr2->lock();
3335 if (LockingMode == LM_LEGACY) {
3336 // Inflate so the object's header no longer refers to the BasicLock.
3337 if (lock->displaced_header().is_unlocked()) {
3338 // The object is locked and the resulting ObjectMonitor* will also be
3339 // locked so it can't be async deflated until ownership is dropped.
3340 // See the big comment in basicLock.cpp: BasicLock::move_to().
3341 ObjectSynchronizer::inflate_helper(kptr2->obj());
3342 }
3343 // Now the displaced header is free to move because the
3344 // object's header no longer refers to it.
3345 buf[i] = (intptr_t)lock->displaced_header().value();
3346 } else if (UseObjectMonitorTable) {
3347 buf[i] = (intptr_t)lock->object_monitor_cache();
3348 }
3349 #ifdef ASSERT
3350 else {
3351 buf[i] = badDispHeaderOSR;
3352 }
3353 #endif
3354 i++;
3355 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3356 }
3357 }
3358 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3359
3360 RegisterMap map(current,
3361 RegisterMap::UpdateMap::skip,
3362 RegisterMap::ProcessFrames::include,
3363 RegisterMap::WalkContinuation::skip);
3364 frame sender = fr.sender(&map);
3365 if (sender.is_interpreted_frame()) {
3366 current->push_cont_fastpath(sender.sp());
3367 }
3368
3369 return buf;
3370 JRT_END
3371
3372 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3373 FREE_C_HEAP_ARRAY(intptr_t, buf);
3374 JRT_END
3375
3376 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3377 bool found = false;
3378 #if INCLUDE_CDS
3379 if (AOTCodeCache::is_using_adapter()) {
3380 auto findblob_archived_table = [&] (AdapterHandlerEntry* handler) {
3381 return (found = (b == CodeCache::find_blob(handler->get_i2c_entry())));
3382 };
3383 _aot_adapter_handler_table.iterate(findblob_archived_table);
3384 }
3385 #endif // INCLUDE_CDS
3386 if (!found) {
3387 auto findblob_runtime_table = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3388 return (found = (b == CodeCache::find_blob(a->get_i2c_entry())));
3389 };
3390 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3391 _adapter_handler_table->iterate(findblob_runtime_table);
3392 }
3393 return found;
3394 }
3395
3396 const char* AdapterHandlerLibrary::name(AdapterFingerPrint* fingerprint) {
3397 return fingerprint->as_basic_args_string();
3398 }
3399
3400 uint32_t AdapterHandlerLibrary::id(AdapterFingerPrint* fingerprint) {
3401 unsigned int hash = fingerprint->compute_hash();
3402 return hash;
3403 }
3404
3405 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3406 bool found = false;
3407 #if INCLUDE_CDS
3408 if (AOTCodeCache::is_using_adapter()) {
3409 auto findblob_archived_table = [&] (AdapterHandlerEntry* handler) {
3410 if (b == CodeCache::find_blob(handler->get_i2c_entry())) {
3411 found = true;
3412 st->print("Adapter for signature: ");
3413 handler->print_adapter_on(st);
3414 return true;
3415 } else {
3416 return false; // keep looking
3417 }
3418 };
3419 _aot_adapter_handler_table.iterate(findblob_archived_table);
3420 }
3421 #endif // INCLUDE_CDS
3422 if (!found) {
3423 auto findblob_runtime_table = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3424 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3425 found = true;
3426 st->print("Adapter for signature: ");
3427 a->print_adapter_on(st);
3428 return true;
3429 } else {
3430 return false; // keep looking
3431 }
3432 };
3433 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3434 _adapter_handler_table->iterate(findblob_runtime_table);
3435 }
3436 assert(found, "Should have found handler");
3437 }
3438
3439 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3440 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3441 if (get_i2c_entry() != nullptr) {
3442 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3443 }
3444 if (get_c2i_entry() != nullptr) {
3445 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3446 }
3447 if (get_c2i_unverified_entry() != nullptr) {
3448 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3449 }
3450 if (get_c2i_no_clinit_check_entry() != nullptr) {
3451 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3452 }
3453 st->cr();
3454 }
3455
3456 #ifndef PRODUCT
3457
3458 void AdapterHandlerLibrary::print_statistics() {
3459 print_table_statistics();
3460 }
3461
3462 #endif /* PRODUCT */
3463
3464 bool AdapterHandlerLibrary::is_abstract_method_adapter(AdapterHandlerEntry* entry) {
3465 if (entry == _abstract_method_handler) {
3466 return true;
3467 }
3468 return false;
3469 }
3470
3471 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3472 assert(current == JavaThread::current(), "pre-condition");
3473 StackOverflow* overflow_state = current->stack_overflow_state();
3474 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3475 overflow_state->set_reserved_stack_activation(current->stack_base());
3476 JRT_END
3477
3478 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* current, frame fr) {
3479 ResourceMark rm(current);
3480 frame activation;
3481 nmethod* nm = nullptr;
3482 int count = 1;
3483
3484 assert(fr.is_java_frame(), "Must start on Java frame");
3485
3486 RegisterMap map(JavaThread::current(),
3487 RegisterMap::UpdateMap::skip,
3488 RegisterMap::ProcessFrames::skip,
3489 RegisterMap::WalkContinuation::skip); // don't walk continuations
3490 for (; !fr.is_first_frame(); fr = fr.sender(&map)) {
3491 if (!fr.is_java_frame()) {
3492 continue;
3493 }
3494
3495 Method* method = nullptr;
3496 bool found = false;
3497 if (fr.is_interpreted_frame()) {
3498 method = fr.interpreter_frame_method();
3499 if (method != nullptr && method->has_reserved_stack_access()) {
3500 found = true;
3501 }
3502 } else {
3503 CodeBlob* cb = fr.cb();
3504 if (cb != nullptr && cb->is_nmethod()) {
3505 nm = cb->as_nmethod();
3506 method = nm->method();
3507 // scope_desc_near() must be used, instead of scope_desc_at() because on
3508 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3509 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != nullptr; sd = sd->sender()) {
3510 method = sd->method();
3511 if (method != nullptr && method->has_reserved_stack_access()) {
3512 found = true;
3513 }
3514 }
3515 }
3516 }
3517 if (found) {
3518 activation = fr;
3519 warning("Potentially dangerous stack overflow in "
3520 "ReservedStackAccess annotated method %s [%d]",
3521 method->name_and_sig_as_C_string(), count++);
3522 EventReservedStackActivation event;
3523 if (event.should_commit()) {
3524 event.set_method(method);
3525 event.commit();
3526 }
3527 }
3528 }
3529 return activation;
3530 }
3531
3532 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3533 // After any safepoint, just before going back to compiled code,
3534 // we inform the GC that we will be doing initializing writes to
3535 // this object in the future without emitting card-marks, so
3536 // GC may take any compensating steps.
3537
3538 oop new_obj = current->vm_result_oop();
3539 if (new_obj == nullptr) return;
3540
3541 BarrierSet *bs = BarrierSet::barrier_set();
3542 bs->on_slowpath_allocation_exit(current, new_obj);
3543 }