1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/nmethod.inline.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/abstractCompiler.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "compiler/disassembler.hpp"
39 #include "gc/shared/barrierSet.hpp"
40 #include "gc/shared/collectedHeap.hpp"
41 #include "gc/shared/gcLocker.inline.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/interpreterRuntime.hpp"
44 #include "jvm.h"
45 #include "jfr/jfrEvents.hpp"
46 #include "logging/log.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "metaprogramming/primitiveConversions.hpp"
50 #include "oops/klass.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/forte.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/jvmtiThreadState.hpp"
57 #include "prims/methodHandles.hpp"
58 #include "prims/nativeLookup.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/basicLock.inline.hpp"
62 #include "runtime/frame.inline.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/jniHandles.inline.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/stackWatermarkSet.hpp"
72 #include "runtime/stubRoutines.hpp"
73 #include "runtime/synchronizer.inline.hpp"
74 #include "runtime/vframe.inline.hpp"
75 #include "runtime/vframeArray.hpp"
76 #include "runtime/vm_version.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/dtrace.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/globalDefinitions.hpp"
81 #include "utilities/resourceHash.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/xmlstream.hpp"
84 #ifdef COMPILER1
85 #include "c1/c1_Runtime1.hpp"
86 #endif
87 #if INCLUDE_JFR
88 #include "jfr/jfr.hpp"
89 #endif
90
91 // Shared stub locations
92 RuntimeStub* SharedRuntime::_wrong_method_blob;
93 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
94 RuntimeStub* SharedRuntime::_ic_miss_blob;
95 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
96 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
97 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
98 address SharedRuntime::_resolve_static_call_entry;
99
100 DeoptimizationBlob* SharedRuntime::_deopt_blob;
101 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
102 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
103 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
104
105 #ifdef COMPILER2
106 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
107 #endif // COMPILER2
108
109 nmethod* SharedRuntime::_cont_doYield_stub;
110
111 //----------------------------generate_stubs-----------------------------------
112 void SharedRuntime::generate_stubs() {
113 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
114 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
115 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
116 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
117 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
118 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
119 _resolve_static_call_entry = _resolve_static_call_blob->entry_point();
120
121 AdapterHandlerLibrary::initialize();
122
123 #if COMPILER2_OR_JVMCI
124 // Vectors are generated only by C2 and JVMCI.
125 bool support_wide = is_wide_vector(MaxVectorSize);
126 if (support_wide) {
127 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
128 }
129 #endif // COMPILER2_OR_JVMCI
130 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
131 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
132
133 generate_deopt_blob();
134
135 #ifdef COMPILER2
136 generate_uncommon_trap_blob();
137 #endif // COMPILER2
138 }
139
140 #include <math.h>
141
142 // Implementation of SharedRuntime
143
144 #ifndef PRODUCT
145 // For statistics
146 uint SharedRuntime::_ic_miss_ctr = 0;
147 uint SharedRuntime::_wrong_method_ctr = 0;
148 uint SharedRuntime::_resolve_static_ctr = 0;
149 uint SharedRuntime::_resolve_virtual_ctr = 0;
150 uint SharedRuntime::_resolve_opt_virtual_ctr = 0;
151 uint SharedRuntime::_implicit_null_throws = 0;
152 uint SharedRuntime::_implicit_div0_throws = 0;
153
154 int64_t SharedRuntime::_nof_normal_calls = 0;
155 int64_t SharedRuntime::_nof_inlined_calls = 0;
156 int64_t SharedRuntime::_nof_megamorphic_calls = 0;
157 int64_t SharedRuntime::_nof_static_calls = 0;
158 int64_t SharedRuntime::_nof_inlined_static_calls = 0;
159 int64_t SharedRuntime::_nof_interface_calls = 0;
160 int64_t SharedRuntime::_nof_inlined_interface_calls = 0;
161
162 uint SharedRuntime::_new_instance_ctr=0;
163 uint SharedRuntime::_new_array_ctr=0;
164 uint SharedRuntime::_multi2_ctr=0;
165 uint SharedRuntime::_multi3_ctr=0;
166 uint SharedRuntime::_multi4_ctr=0;
167 uint SharedRuntime::_multi5_ctr=0;
168 uint SharedRuntime::_mon_enter_stub_ctr=0;
169 uint SharedRuntime::_mon_exit_stub_ctr=0;
170 uint SharedRuntime::_mon_enter_ctr=0;
171 uint SharedRuntime::_mon_exit_ctr=0;
172 uint SharedRuntime::_partial_subtype_ctr=0;
173 uint SharedRuntime::_jbyte_array_copy_ctr=0;
174 uint SharedRuntime::_jshort_array_copy_ctr=0;
175 uint SharedRuntime::_jint_array_copy_ctr=0;
176 uint SharedRuntime::_jlong_array_copy_ctr=0;
177 uint SharedRuntime::_oop_array_copy_ctr=0;
178 uint SharedRuntime::_checkcast_array_copy_ctr=0;
179 uint SharedRuntime::_unsafe_array_copy_ctr=0;
180 uint SharedRuntime::_generic_array_copy_ctr=0;
181 uint SharedRuntime::_slow_array_copy_ctr=0;
182 uint SharedRuntime::_find_handler_ctr=0;
183 uint SharedRuntime::_rethrow_ctr=0;
184 uint SharedRuntime::_unsafe_set_memory_ctr=0;
185
186 int SharedRuntime::_ICmiss_index = 0;
187 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
188 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
189
190
191 void SharedRuntime::trace_ic_miss(address at) {
192 for (int i = 0; i < _ICmiss_index; i++) {
193 if (_ICmiss_at[i] == at) {
194 _ICmiss_count[i]++;
195 return;
196 }
197 }
198 int index = _ICmiss_index++;
199 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
200 _ICmiss_at[index] = at;
201 _ICmiss_count[index] = 1;
202 }
203
204 void SharedRuntime::print_ic_miss_histogram() {
205 if (ICMissHistogram) {
206 tty->print_cr("IC Miss Histogram:");
207 int tot_misses = 0;
208 for (int i = 0; i < _ICmiss_index; i++) {
209 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
210 tot_misses += _ICmiss_count[i];
211 }
212 tty->print_cr("Total IC misses: %7d", tot_misses);
213 }
214 }
215 #endif // PRODUCT
216
217
218 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
219 return x * y;
220 JRT_END
221
222
223 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
224 if (x == min_jlong && y == CONST64(-1)) {
225 return x;
226 } else {
227 return x / y;
228 }
229 JRT_END
230
231
232 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
233 if (x == min_jlong && y == CONST64(-1)) {
234 return 0;
235 } else {
236 return x % y;
237 }
238 JRT_END
239
240
241 #ifdef _WIN64
242 const juint float_sign_mask = 0x7FFFFFFF;
243 const juint float_infinity = 0x7F800000;
244 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
245 const julong double_infinity = CONST64(0x7FF0000000000000);
246 #endif
247
248 #if !defined(X86)
249 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
250 #ifdef _WIN64
251 // 64-bit Windows on amd64 returns the wrong values for
252 // infinity operands.
253 juint xbits = PrimitiveConversions::cast<juint>(x);
254 juint ybits = PrimitiveConversions::cast<juint>(y);
255 // x Mod Infinity == x unless x is infinity
256 if (((xbits & float_sign_mask) != float_infinity) &&
257 ((ybits & float_sign_mask) == float_infinity) ) {
258 return x;
259 }
260 return ((jfloat)fmod_winx64((double)x, (double)y));
261 #else
262 return ((jfloat)fmod((double)x,(double)y));
263 #endif
264 JRT_END
265
266 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
267 #ifdef _WIN64
268 julong xbits = PrimitiveConversions::cast<julong>(x);
269 julong ybits = PrimitiveConversions::cast<julong>(y);
270 // x Mod Infinity == x unless x is infinity
271 if (((xbits & double_sign_mask) != double_infinity) &&
272 ((ybits & double_sign_mask) == double_infinity) ) {
273 return x;
274 }
275 return ((jdouble)fmod_winx64((double)x, (double)y));
276 #else
277 return ((jdouble)fmod((double)x,(double)y));
278 #endif
279 JRT_END
280 #endif // !X86
281
282 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
283 return (jfloat)x;
284 JRT_END
285
286 #ifdef __SOFTFP__
287 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
288 return x + y;
289 JRT_END
290
291 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
292 return x - y;
293 JRT_END
294
295 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
296 return x * y;
297 JRT_END
298
299 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
300 return x / y;
301 JRT_END
302
303 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
304 return x + y;
305 JRT_END
306
307 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
308 return x - y;
309 JRT_END
310
311 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
312 return x * y;
313 JRT_END
314
315 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
316 return x / y;
317 JRT_END
318
319 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
320 return (jdouble)x;
321 JRT_END
322
323 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
324 return (jdouble)x;
325 JRT_END
326
327 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
328 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
329 JRT_END
330
331 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
332 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
333 JRT_END
334
335 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
336 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
337 JRT_END
338
339 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
340 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
341 JRT_END
342
343 // Functions to return the opposite of the aeabi functions for nan.
344 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
345 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
346 JRT_END
347
348 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
349 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
350 JRT_END
351
352 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
353 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
354 JRT_END
355
356 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
357 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
358 JRT_END
359
360 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
361 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
362 JRT_END
363
364 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
365 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
366 JRT_END
367
368 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
369 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
370 JRT_END
371
372 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
373 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
374 JRT_END
375
376 // Intrinsics make gcc generate code for these.
377 float SharedRuntime::fneg(float f) {
378 return -f;
379 }
380
381 double SharedRuntime::dneg(double f) {
382 return -f;
383 }
384
385 #endif // __SOFTFP__
386
387 #if defined(__SOFTFP__) || defined(E500V2)
388 // Intrinsics make gcc generate code for these.
389 double SharedRuntime::dabs(double f) {
390 return (f <= (double)0.0) ? (double)0.0 - f : f;
391 }
392
393 #endif
394
395 #if defined(__SOFTFP__) || defined(PPC)
396 double SharedRuntime::dsqrt(double f) {
397 return sqrt(f);
398 }
399 #endif
400
401 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
402 if (g_isnan(x))
403 return 0;
404 if (x >= (jfloat) max_jint)
405 return max_jint;
406 if (x <= (jfloat) min_jint)
407 return min_jint;
408 return (jint) x;
409 JRT_END
410
411
412 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
413 if (g_isnan(x))
414 return 0;
415 if (x >= (jfloat) max_jlong)
416 return max_jlong;
417 if (x <= (jfloat) min_jlong)
418 return min_jlong;
419 return (jlong) x;
420 JRT_END
421
422
423 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
424 if (g_isnan(x))
425 return 0;
426 if (x >= (jdouble) max_jint)
427 return max_jint;
428 if (x <= (jdouble) min_jint)
429 return min_jint;
430 return (jint) x;
431 JRT_END
432
433
434 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
435 if (g_isnan(x))
436 return 0;
437 if (x >= (jdouble) max_jlong)
438 return max_jlong;
439 if (x <= (jdouble) min_jlong)
440 return min_jlong;
441 return (jlong) x;
442 JRT_END
443
444
445 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
446 return (jfloat)x;
447 JRT_END
448
449
450 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
451 return (jfloat)x;
452 JRT_END
453
454
455 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
456 return (jdouble)x;
457 JRT_END
458
459
460 // Exception handling across interpreter/compiler boundaries
461 //
462 // exception_handler_for_return_address(...) returns the continuation address.
463 // The continuation address is the entry point of the exception handler of the
464 // previous frame depending on the return address.
465
466 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* current, address return_address) {
467 // Note: This is called when we have unwound the frame of the callee that did
468 // throw an exception. So far, no check has been performed by the StackWatermarkSet.
469 // Notably, the stack is not walkable at this point, and hence the check must
470 // be deferred until later. Specifically, any of the handlers returned here in
471 // this function, will get dispatched to, and call deferred checks to
472 // StackWatermarkSet::after_unwind at a point where the stack is walkable.
473 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
474 assert(current->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
475
476 // Reset method handle flag.
477 current->set_is_method_handle_return(false);
478
479 #if INCLUDE_JVMCI
480 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
481 // and other exception handler continuations do not read it
482 current->set_exception_pc(nullptr);
483 #endif // INCLUDE_JVMCI
484
485 if (Continuation::is_return_barrier_entry(return_address)) {
486 return StubRoutines::cont_returnBarrierExc();
487 }
488
489 // The fastest case first
490 CodeBlob* blob = CodeCache::find_blob(return_address);
491 nmethod* nm = (blob != nullptr) ? blob->as_nmethod_or_null() : nullptr;
492 if (nm != nullptr) {
493 // Set flag if return address is a method handle call site.
494 current->set_is_method_handle_return(nm->is_method_handle_return(return_address));
495 // native nmethods don't have exception handlers
496 assert(!nm->is_native_method() || nm->method()->is_continuation_enter_intrinsic(), "no exception handler");
497 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
498 if (nm->is_deopt_pc(return_address)) {
499 // If we come here because of a stack overflow, the stack may be
500 // unguarded. Reguard the stack otherwise if we return to the
501 // deopt blob and the stack bang causes a stack overflow we
502 // crash.
503 StackOverflow* overflow_state = current->stack_overflow_state();
504 bool guard_pages_enabled = overflow_state->reguard_stack_if_needed();
505 if (overflow_state->reserved_stack_activation() != current->stack_base()) {
506 overflow_state->set_reserved_stack_activation(current->stack_base());
507 }
508 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
509 // The deferred StackWatermarkSet::after_unwind check will be performed in
510 // Deoptimization::fetch_unroll_info (with exec_mode == Unpack_exception)
511 return SharedRuntime::deopt_blob()->unpack_with_exception();
512 } else {
513 // The deferred StackWatermarkSet::after_unwind check will be performed in
514 // * OptoRuntime::handle_exception_C_helper for C2 code
515 // * exception_handler_for_pc_helper via Runtime1::handle_exception_from_callee_id for C1 code
516 return nm->exception_begin();
517 }
518 }
519
520 // Entry code
521 if (StubRoutines::returns_to_call_stub(return_address)) {
522 // The deferred StackWatermarkSet::after_unwind check will be performed in
523 // JavaCallWrapper::~JavaCallWrapper
524 return StubRoutines::catch_exception_entry();
525 }
526 if (blob != nullptr && blob->is_upcall_stub()) {
527 return StubRoutines::upcall_stub_exception_handler();
528 }
529 // Interpreted code
530 if (Interpreter::contains(return_address)) {
531 // The deferred StackWatermarkSet::after_unwind check will be performed in
532 // InterpreterRuntime::exception_handler_for_exception
533 return Interpreter::rethrow_exception_entry();
534 }
535
536 guarantee(blob == nullptr || !blob->is_runtime_stub(), "caller should have skipped stub");
537 guarantee(!VtableStubs::contains(return_address), "null exceptions in vtables should have been handled already!");
538
539 #ifndef PRODUCT
540 { ResourceMark rm;
541 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
542 os::print_location(tty, (intptr_t)return_address);
543 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
544 tty->print_cr("b) other problem");
545 }
546 #endif // PRODUCT
547 ShouldNotReachHere();
548 return nullptr;
549 }
550
551
552 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* current, address return_address))
553 return raw_exception_handler_for_return_address(current, return_address);
554 JRT_END
555
556
557 address SharedRuntime::get_poll_stub(address pc) {
558 address stub;
559 // Look up the code blob
560 CodeBlob *cb = CodeCache::find_blob(pc);
561
562 // Should be an nmethod
563 guarantee(cb != nullptr && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
564
565 // Look up the relocation information
566 assert(cb->as_nmethod()->is_at_poll_or_poll_return(pc),
567 "safepoint polling: type must be poll at pc " INTPTR_FORMAT, p2i(pc));
568
569 #ifdef ASSERT
570 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
571 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
572 Disassembler::decode(cb);
573 fatal("Only polling locations are used for safepoint");
574 }
575 #endif
576
577 bool at_poll_return = cb->as_nmethod()->is_at_poll_return(pc);
578 bool has_wide_vectors = cb->as_nmethod()->has_wide_vectors();
579 if (at_poll_return) {
580 assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
581 "polling page return stub not created yet");
582 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
583 } else if (has_wide_vectors) {
584 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != nullptr,
585 "polling page vectors safepoint stub not created yet");
586 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
587 } else {
588 assert(SharedRuntime::polling_page_safepoint_handler_blob() != nullptr,
589 "polling page safepoint stub not created yet");
590 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
591 }
592 log_debug(safepoint)("... found polling page %s exception at pc = "
593 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
594 at_poll_return ? "return" : "loop",
595 (intptr_t)pc, (intptr_t)stub);
596 return stub;
597 }
598
599 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception) {
600 if (JvmtiExport::can_post_on_exceptions()) {
601 vframeStream vfst(current, true);
602 methodHandle method = methodHandle(current, vfst.method());
603 address bcp = method()->bcp_from(vfst.bci());
604 JvmtiExport::post_exception_throw(current, method(), bcp, h_exception());
605 }
606
607 #if INCLUDE_JVMCI
608 if (EnableJVMCI && UseJVMCICompiler) {
609 vframeStream vfst(current, true);
610 methodHandle method = methodHandle(current, vfst.method());
611 int bci = vfst.bci();
612 MethodData* trap_mdo = method->method_data();
613 if (trap_mdo != nullptr) {
614 // Set exception_seen if the exceptional bytecode is an invoke
615 Bytecode_invoke call = Bytecode_invoke_check(method, bci);
616 if (call.is_valid()) {
617 ResourceMark rm(current);
618
619 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
620 MutexLocker ml(trap_mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
621
622 ProfileData* pdata = trap_mdo->allocate_bci_to_data(bci, nullptr);
623 if (pdata != nullptr && pdata->is_BitData()) {
624 BitData* bit_data = (BitData*) pdata;
625 bit_data->set_exception_seen();
626 }
627 }
628 }
629 }
630 #endif
631
632 Exceptions::_throw(current, __FILE__, __LINE__, h_exception);
633 }
634
635 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message) {
636 Handle h_exception = Exceptions::new_exception(current, name, message);
637 throw_and_post_jvmti_exception(current, h_exception);
638 }
639
640 #if INCLUDE_JVMTI
641 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current))
642 assert(hide == JNI_FALSE, "must be VTMS transition finish");
643 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
644 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
645 JNIHandles::destroy_local(vthread);
646 JRT_END
647
648 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current))
649 assert(hide == JNI_TRUE, "must be VTMS transition start");
650 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
651 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
652 JNIHandles::destroy_local(vthread);
653 JRT_END
654
655 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current))
656 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
657 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
658 JNIHandles::destroy_local(vthread);
659 JRT_END
660
661 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current))
662 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
663 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
664 JNIHandles::destroy_local(vthread);
665 JRT_END
666 #endif // INCLUDE_JVMTI
667
668 // The interpreter code to call this tracing function is only
669 // called/generated when UL is on for redefine, class and has the right level
670 // and tags. Since obsolete methods are never compiled, we don't have
671 // to modify the compilers to generate calls to this function.
672 //
673 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
674 JavaThread* thread, Method* method))
675 if (method->is_obsolete()) {
676 // We are calling an obsolete method, but this is not necessarily
677 // an error. Our method could have been redefined just after we
678 // fetched the Method* from the constant pool.
679 ResourceMark rm;
680 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
681 }
682 return 0;
683 JRT_END
684
685 // ret_pc points into caller; we are returning caller's exception handler
686 // for given exception
687 // Note that the implementation of this method assumes it's only called when an exception has actually occured
688 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
689 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
690 assert(nm != nullptr, "must exist");
691 ResourceMark rm;
692
693 #if INCLUDE_JVMCI
694 if (nm->is_compiled_by_jvmci()) {
695 // lookup exception handler for this pc
696 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
697 ExceptionHandlerTable table(nm);
698 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
699 if (t != nullptr) {
700 return nm->code_begin() + t->pco();
701 } else {
702 return Deoptimization::deoptimize_for_missing_exception_handler(nm);
703 }
704 }
705 #endif // INCLUDE_JVMCI
706
707 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
708 // determine handler bci, if any
709 EXCEPTION_MARK;
710
711 int handler_bci = -1;
712 int scope_depth = 0;
713 if (!force_unwind) {
714 int bci = sd->bci();
715 bool recursive_exception = false;
716 do {
717 bool skip_scope_increment = false;
718 // exception handler lookup
719 Klass* ek = exception->klass();
720 methodHandle mh(THREAD, sd->method());
721 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
722 if (HAS_PENDING_EXCEPTION) {
723 recursive_exception = true;
724 // We threw an exception while trying to find the exception handler.
725 // Transfer the new exception to the exception handle which will
726 // be set into thread local storage, and do another lookup for an
727 // exception handler for this exception, this time starting at the
728 // BCI of the exception handler which caused the exception to be
729 // thrown (bugs 4307310 and 4546590). Set "exception" reference
730 // argument to ensure that the correct exception is thrown (4870175).
731 recursive_exception_occurred = true;
732 exception = Handle(THREAD, PENDING_EXCEPTION);
733 CLEAR_PENDING_EXCEPTION;
734 if (handler_bci >= 0) {
735 bci = handler_bci;
736 handler_bci = -1;
737 skip_scope_increment = true;
738 }
739 }
740 else {
741 recursive_exception = false;
742 }
743 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
744 sd = sd->sender();
745 if (sd != nullptr) {
746 bci = sd->bci();
747 }
748 ++scope_depth;
749 }
750 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != nullptr));
751 }
752
753 // found handling method => lookup exception handler
754 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
755
756 ExceptionHandlerTable table(nm);
757 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
758 if (t == nullptr && (nm->is_compiled_by_c1() || handler_bci != -1)) {
759 // Allow abbreviated catch tables. The idea is to allow a method
760 // to materialize its exceptions without committing to the exact
761 // routing of exceptions. In particular this is needed for adding
762 // a synthetic handler to unlock monitors when inlining
763 // synchronized methods since the unlock path isn't represented in
764 // the bytecodes.
765 t = table.entry_for(catch_pco, -1, 0);
766 }
767
768 #ifdef COMPILER1
769 if (t == nullptr && nm->is_compiled_by_c1()) {
770 assert(nm->unwind_handler_begin() != nullptr, "");
771 return nm->unwind_handler_begin();
772 }
773 #endif
774
775 if (t == nullptr) {
776 ttyLocker ttyl;
777 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d, catch_pco: %d", p2i(ret_pc), handler_bci, catch_pco);
778 tty->print_cr(" Exception:");
779 exception->print();
780 tty->cr();
781 tty->print_cr(" Compiled exception table :");
782 table.print();
783 nm->print();
784 nm->print_code();
785 guarantee(false, "missing exception handler");
786 return nullptr;
787 }
788
789 if (handler_bci != -1) { // did we find a handler in this method?
790 sd->method()->set_exception_handler_entered(handler_bci); // profile
791 }
792 return nm->code_begin() + t->pco();
793 }
794
795 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* current))
796 // These errors occur only at call sites
797 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_AbstractMethodError());
798 JRT_END
799
800 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
801 // These errors occur only at call sites
802 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
803 JRT_END
804
805 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* current))
806 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
807 JRT_END
808
809 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* current))
810 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
811 JRT_END
812
813 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* current))
814 // This entry point is effectively only used for NullPointerExceptions which occur at inline
815 // cache sites (when the callee activation is not yet set up) so we are at a call site
816 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
817 JRT_END
818
819 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* current))
820 throw_StackOverflowError_common(current, false);
821 JRT_END
822
823 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* current))
824 throw_StackOverflowError_common(current, true);
825 JRT_END
826
827 void SharedRuntime::throw_StackOverflowError_common(JavaThread* current, bool delayed) {
828 // We avoid using the normal exception construction in this case because
829 // it performs an upcall to Java, and we're already out of stack space.
830 JavaThread* THREAD = current; // For exception macros.
831 Klass* k = vmClasses::StackOverflowError_klass();
832 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
833 if (delayed) {
834 java_lang_Throwable::set_message(exception_oop,
835 Universe::delayed_stack_overflow_error_message());
836 }
837 Handle exception (current, exception_oop);
838 if (StackTraceInThrowable) {
839 java_lang_Throwable::fill_in_stack_trace(exception);
840 }
841 // Remove the ScopedValue bindings in case we got a
842 // StackOverflowError while we were trying to remove ScopedValue
843 // bindings.
844 current->clear_scopedValueBindings();
845 // Increment counter for hs_err file reporting
846 Atomic::inc(&Exceptions::_stack_overflow_errors);
847 throw_and_post_jvmti_exception(current, exception);
848 }
849
850 address SharedRuntime::continuation_for_implicit_exception(JavaThread* current,
851 address pc,
852 ImplicitExceptionKind exception_kind)
853 {
854 address target_pc = nullptr;
855
856 if (Interpreter::contains(pc)) {
857 switch (exception_kind) {
858 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
859 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
860 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
861 default: ShouldNotReachHere();
862 }
863 } else {
864 switch (exception_kind) {
865 case STACK_OVERFLOW: {
866 // Stack overflow only occurs upon frame setup; the callee is
867 // going to be unwound. Dispatch to a shared runtime stub
868 // which will cause the StackOverflowError to be fabricated
869 // and processed.
870 // Stack overflow should never occur during deoptimization:
871 // the compiled method bangs the stack by as much as the
872 // interpreter would need in case of a deoptimization. The
873 // deoptimization blob and uncommon trap blob bang the stack
874 // in a debug VM to verify the correctness of the compiled
875 // method stack banging.
876 assert(current->deopt_mark() == nullptr, "no stack overflow from deopt blob/uncommon trap");
877 Events::log_exception(current, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
878 return StubRoutines::throw_StackOverflowError_entry();
879 }
880
881 case IMPLICIT_NULL: {
882 if (VtableStubs::contains(pc)) {
883 // We haven't yet entered the callee frame. Fabricate an
884 // exception and begin dispatching it in the caller. Since
885 // the caller was at a call site, it's safe to destroy all
886 // caller-saved registers, as these entry points do.
887 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
888
889 // If vt_stub is null, then return null to signal handler to report the SEGV error.
890 if (vt_stub == nullptr) return nullptr;
891
892 if (vt_stub->is_abstract_method_error(pc)) {
893 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
894 Events::log_exception(current, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
895 // Instead of throwing the abstract method error here directly, we re-resolve
896 // and will throw the AbstractMethodError during resolve. As a result, we'll
897 // get a more detailed error message.
898 return SharedRuntime::get_handle_wrong_method_stub();
899 } else {
900 Events::log_exception(current, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
901 // Assert that the signal comes from the expected location in stub code.
902 assert(vt_stub->is_null_pointer_exception(pc),
903 "obtained signal from unexpected location in stub code");
904 return StubRoutines::throw_NullPointerException_at_call_entry();
905 }
906 } else {
907 CodeBlob* cb = CodeCache::find_blob(pc);
908
909 // If code blob is null, then return null to signal handler to report the SEGV error.
910 if (cb == nullptr) return nullptr;
911
912 // Exception happened in CodeCache. Must be either:
913 // 1. Inline-cache check in C2I handler blob,
914 // 2. Inline-cache check in nmethod, or
915 // 3. Implicit null exception in nmethod
916
917 if (!cb->is_nmethod()) {
918 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
919 if (!is_in_blob) {
920 // Allow normal crash reporting to handle this
921 return nullptr;
922 }
923 Events::log_exception(current, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
924 // There is no handler here, so we will simply unwind.
925 return StubRoutines::throw_NullPointerException_at_call_entry();
926 }
927
928 // Otherwise, it's a compiled method. Consult its exception handlers.
929 nmethod* nm = cb->as_nmethod();
930 if (nm->inlinecache_check_contains(pc)) {
931 // exception happened inside inline-cache check code
932 // => the nmethod is not yet active (i.e., the frame
933 // is not set up yet) => use return address pushed by
934 // caller => don't push another return address
935 Events::log_exception(current, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
936 return StubRoutines::throw_NullPointerException_at_call_entry();
937 }
938
939 if (nm->method()->is_method_handle_intrinsic()) {
940 // exception happened inside MH dispatch code, similar to a vtable stub
941 Events::log_exception(current, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
942 return StubRoutines::throw_NullPointerException_at_call_entry();
943 }
944
945 #ifndef PRODUCT
946 _implicit_null_throws++;
947 #endif
948 target_pc = nm->continuation_for_implicit_null_exception(pc);
949 // If there's an unexpected fault, target_pc might be null,
950 // in which case we want to fall through into the normal
951 // error handling code.
952 }
953
954 break; // fall through
955 }
956
957
958 case IMPLICIT_DIVIDE_BY_ZERO: {
959 nmethod* nm = CodeCache::find_nmethod(pc);
960 guarantee(nm != nullptr, "must have containing compiled method for implicit division-by-zero exceptions");
961 #ifndef PRODUCT
962 _implicit_div0_throws++;
963 #endif
964 target_pc = nm->continuation_for_implicit_div0_exception(pc);
965 // If there's an unexpected fault, target_pc might be null,
966 // in which case we want to fall through into the normal
967 // error handling code.
968 break; // fall through
969 }
970
971 default: ShouldNotReachHere();
972 }
973
974 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
975
976 if (exception_kind == IMPLICIT_NULL) {
977 #ifndef PRODUCT
978 // for AbortVMOnException flag
979 Exceptions::debug_check_abort("java.lang.NullPointerException");
980 #endif //PRODUCT
981 Events::log_exception(current, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
982 } else {
983 #ifndef PRODUCT
984 // for AbortVMOnException flag
985 Exceptions::debug_check_abort("java.lang.ArithmeticException");
986 #endif //PRODUCT
987 Events::log_exception(current, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
988 }
989 return target_pc;
990 }
991
992 ShouldNotReachHere();
993 return nullptr;
994 }
995
996
997 /**
998 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
999 * installed in the native function entry of all native Java methods before
1000 * they get linked to their actual native methods.
1001 *
1002 * \note
1003 * This method actually never gets called! The reason is because
1004 * the interpreter's native entries call NativeLookup::lookup() which
1005 * throws the exception when the lookup fails. The exception is then
1006 * caught and forwarded on the return from NativeLookup::lookup() call
1007 * before the call to the native function. This might change in the future.
1008 */
1009 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
1010 {
1011 // We return a bad value here to make sure that the exception is
1012 // forwarded before we look at the return value.
1013 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
1014 }
1015 JNI_END
1016
1017 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
1018 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
1019 }
1020
1021 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
1022 #if INCLUDE_JVMCI
1023 if (!obj->klass()->has_finalizer()) {
1024 return;
1025 }
1026 #endif // INCLUDE_JVMCI
1027 assert(oopDesc::is_oop(obj), "must be a valid oop");
1028 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1029 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1030 JRT_END
1031
1032 jlong SharedRuntime::get_java_tid(JavaThread* thread) {
1033 assert(thread != nullptr, "No thread");
1034 if (thread == nullptr) {
1035 return 0;
1036 }
1037 guarantee(Thread::current() != thread || thread->is_oop_safe(),
1038 "current cannot touch oops after its GC barrier is detached.");
1039 oop obj = thread->threadObj();
1040 return (obj == nullptr) ? 0 : java_lang_Thread::thread_id(obj);
1041 }
1042
1043 /**
1044 * This function ought to be a void function, but cannot be because
1045 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1046 * 6254741. Once that is fixed we can remove the dummy return value.
1047 */
1048 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1049 return dtrace_object_alloc(JavaThread::current(), o, o->size());
1050 }
1051
1052 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o) {
1053 return dtrace_object_alloc(thread, o, o->size());
1054 }
1055
1056 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size) {
1057 assert(DTraceAllocProbes, "wrong call");
1058 Klass* klass = o->klass();
1059 Symbol* name = klass->name();
1060 HOTSPOT_OBJECT_ALLOC(
1061 get_java_tid(thread),
1062 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1063 return 0;
1064 }
1065
1066 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1067 JavaThread* current, Method* method))
1068 assert(current == JavaThread::current(), "pre-condition");
1069
1070 assert(DTraceMethodProbes, "wrong call");
1071 Symbol* kname = method->klass_name();
1072 Symbol* name = method->name();
1073 Symbol* sig = method->signature();
1074 HOTSPOT_METHOD_ENTRY(
1075 get_java_tid(current),
1076 (char *) kname->bytes(), kname->utf8_length(),
1077 (char *) name->bytes(), name->utf8_length(),
1078 (char *) sig->bytes(), sig->utf8_length());
1079 return 0;
1080 JRT_END
1081
1082 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1083 JavaThread* current, Method* method))
1084 assert(current == JavaThread::current(), "pre-condition");
1085 assert(DTraceMethodProbes, "wrong call");
1086 Symbol* kname = method->klass_name();
1087 Symbol* name = method->name();
1088 Symbol* sig = method->signature();
1089 HOTSPOT_METHOD_RETURN(
1090 get_java_tid(current),
1091 (char *) kname->bytes(), kname->utf8_length(),
1092 (char *) name->bytes(), name->utf8_length(),
1093 (char *) sig->bytes(), sig->utf8_length());
1094 return 0;
1095 JRT_END
1096
1097
1098 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1099 // for a call current in progress, i.e., arguments has been pushed on stack
1100 // put callee has not been invoked yet. Used by: resolve virtual/static,
1101 // vtable updates, etc. Caller frame must be compiled.
1102 Handle SharedRuntime::find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1103 JavaThread* current = THREAD;
1104 ResourceMark rm(current);
1105
1106 // last java frame on stack (which includes native call frames)
1107 vframeStream vfst(current, true); // Do not skip and javaCalls
1108
1109 return find_callee_info_helper(vfst, bc, callinfo, THREAD);
1110 }
1111
1112 Method* SharedRuntime::extract_attached_method(vframeStream& vfst) {
1113 nmethod* caller = vfst.nm();
1114
1115 address pc = vfst.frame_pc();
1116 { // Get call instruction under lock because another thread may be busy patching it.
1117 CompiledICLocker ic_locker(caller);
1118 return caller->attached_method_before_pc(pc);
1119 }
1120 return nullptr;
1121 }
1122
1123 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1124 // for a call current in progress, i.e., arguments has been pushed on stack
1125 // but callee has not been invoked yet. Caller frame must be compiled.
1126 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1127 CallInfo& callinfo, TRAPS) {
1128 Handle receiver;
1129 Handle nullHandle; // create a handy null handle for exception returns
1130 JavaThread* current = THREAD;
1131
1132 assert(!vfst.at_end(), "Java frame must exist");
1133
1134 // Find caller and bci from vframe
1135 methodHandle caller(current, vfst.method());
1136 int bci = vfst.bci();
1137
1138 if (caller->is_continuation_enter_intrinsic()) {
1139 bc = Bytecodes::_invokestatic;
1140 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1141 return receiver;
1142 }
1143
1144 Bytecode_invoke bytecode(caller, bci);
1145 int bytecode_index = bytecode.index();
1146 bc = bytecode.invoke_code();
1147
1148 methodHandle attached_method(current, extract_attached_method(vfst));
1149 if (attached_method.not_null()) {
1150 Method* callee = bytecode.static_target(CHECK_NH);
1151 vmIntrinsics::ID id = callee->intrinsic_id();
1152 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1153 // it attaches statically resolved method to the call site.
1154 if (MethodHandles::is_signature_polymorphic(id) &&
1155 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1156 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1157
1158 // Adjust invocation mode according to the attached method.
1159 switch (bc) {
1160 case Bytecodes::_invokevirtual:
1161 if (attached_method->method_holder()->is_interface()) {
1162 bc = Bytecodes::_invokeinterface;
1163 }
1164 break;
1165 case Bytecodes::_invokeinterface:
1166 if (!attached_method->method_holder()->is_interface()) {
1167 bc = Bytecodes::_invokevirtual;
1168 }
1169 break;
1170 case Bytecodes::_invokehandle:
1171 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1172 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1173 : Bytecodes::_invokevirtual;
1174 }
1175 break;
1176 default:
1177 break;
1178 }
1179 }
1180 }
1181
1182 assert(bc != Bytecodes::_illegal, "not initialized");
1183
1184 bool has_receiver = bc != Bytecodes::_invokestatic &&
1185 bc != Bytecodes::_invokedynamic &&
1186 bc != Bytecodes::_invokehandle;
1187
1188 // Find receiver for non-static call
1189 if (has_receiver) {
1190 // This register map must be update since we need to find the receiver for
1191 // compiled frames. The receiver might be in a register.
1192 RegisterMap reg_map2(current,
1193 RegisterMap::UpdateMap::include,
1194 RegisterMap::ProcessFrames::include,
1195 RegisterMap::WalkContinuation::skip);
1196 frame stubFrame = current->last_frame();
1197 // Caller-frame is a compiled frame
1198 frame callerFrame = stubFrame.sender(®_map2);
1199
1200 if (attached_method.is_null()) {
1201 Method* callee = bytecode.static_target(CHECK_NH);
1202 if (callee == nullptr) {
1203 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1204 }
1205 }
1206
1207 // Retrieve from a compiled argument list
1208 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1209 assert(oopDesc::is_oop_or_null(receiver()), "");
1210
1211 if (receiver.is_null()) {
1212 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1213 }
1214 }
1215
1216 // Resolve method
1217 if (attached_method.not_null()) {
1218 // Parameterized by attached method.
1219 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1220 } else {
1221 // Parameterized by bytecode.
1222 constantPoolHandle constants(current, caller->constants());
1223 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1224 }
1225
1226 #ifdef ASSERT
1227 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1228 if (has_receiver) {
1229 assert(receiver.not_null(), "should have thrown exception");
1230 Klass* receiver_klass = receiver->klass();
1231 Klass* rk = nullptr;
1232 if (attached_method.not_null()) {
1233 // In case there's resolved method attached, use its holder during the check.
1234 rk = attached_method->method_holder();
1235 } else {
1236 // Klass is already loaded.
1237 constantPoolHandle constants(current, caller->constants());
1238 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1239 }
1240 Klass* static_receiver_klass = rk;
1241 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1242 "actual receiver must be subclass of static receiver klass");
1243 if (receiver_klass->is_instance_klass()) {
1244 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1245 tty->print_cr("ERROR: Klass not yet initialized!!");
1246 receiver_klass->print();
1247 }
1248 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1249 }
1250 }
1251 #endif
1252
1253 return receiver;
1254 }
1255
1256 methodHandle SharedRuntime::find_callee_method(TRAPS) {
1257 JavaThread* current = THREAD;
1258 ResourceMark rm(current);
1259 // We need first to check if any Java activations (compiled, interpreted)
1260 // exist on the stack since last JavaCall. If not, we need
1261 // to get the target method from the JavaCall wrapper.
1262 vframeStream vfst(current, true); // Do not skip any javaCalls
1263 methodHandle callee_method;
1264 if (vfst.at_end()) {
1265 // No Java frames were found on stack since we did the JavaCall.
1266 // Hence the stack can only contain an entry_frame. We need to
1267 // find the target method from the stub frame.
1268 RegisterMap reg_map(current,
1269 RegisterMap::UpdateMap::skip,
1270 RegisterMap::ProcessFrames::include,
1271 RegisterMap::WalkContinuation::skip);
1272 frame fr = current->last_frame();
1273 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1274 fr = fr.sender(®_map);
1275 assert(fr.is_entry_frame(), "must be");
1276 // fr is now pointing to the entry frame.
1277 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1278 } else {
1279 Bytecodes::Code bc;
1280 CallInfo callinfo;
1281 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1282 callee_method = methodHandle(current, callinfo.selected_method());
1283 }
1284 assert(callee_method()->is_method(), "must be");
1285 return callee_method;
1286 }
1287
1288 // Resolves a call.
1289 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1290 JavaThread* current = THREAD;
1291 ResourceMark rm(current);
1292 RegisterMap cbl_map(current,
1293 RegisterMap::UpdateMap::skip,
1294 RegisterMap::ProcessFrames::include,
1295 RegisterMap::WalkContinuation::skip);
1296 frame caller_frame = current->last_frame().sender(&cbl_map);
1297
1298 CodeBlob* caller_cb = caller_frame.cb();
1299 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1300 nmethod* caller_nm = caller_cb->as_nmethod();
1301
1302 // determine call info & receiver
1303 // note: a) receiver is null for static calls
1304 // b) an exception is thrown if receiver is null for non-static calls
1305 CallInfo call_info;
1306 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1307 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1308
1309 NoSafepointVerifier nsv;
1310
1311 methodHandle callee_method(current, call_info.selected_method());
1312
1313 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1314 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1315 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1316 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1317 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1318
1319 assert(!caller_nm->is_unloading(), "It should not be unloading");
1320
1321 #ifndef PRODUCT
1322 // tracing/debugging/statistics
1323 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1324 (is_virtual) ? (&_resolve_virtual_ctr) :
1325 (&_resolve_static_ctr);
1326 Atomic::inc(addr);
1327
1328 if (TraceCallFixup) {
1329 ResourceMark rm(current);
1330 tty->print("resolving %s%s (%s) call to",
1331 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1332 Bytecodes::name(invoke_code));
1333 callee_method->print_short_name(tty);
1334 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1335 p2i(caller_frame.pc()), p2i(callee_method->code()));
1336 }
1337 #endif
1338
1339 if (invoke_code == Bytecodes::_invokestatic) {
1340 assert(callee_method->method_holder()->is_initialized() ||
1341 callee_method->method_holder()->is_init_thread(current),
1342 "invalid class initialization state for invoke_static");
1343 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1344 // In order to keep class initialization check, do not patch call
1345 // site for static call when the class is not fully initialized.
1346 // Proper check is enforced by call site re-resolution on every invocation.
1347 //
1348 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1349 // explicit class initialization check is put in nmethod entry (VEP).
1350 assert(callee_method->method_holder()->is_linked(), "must be");
1351 return callee_method;
1352 }
1353 }
1354
1355
1356 // JSR 292 key invariant:
1357 // If the resolved method is a MethodHandle invoke target, the call
1358 // site must be a MethodHandle call site, because the lambda form might tail-call
1359 // leaving the stack in a state unknown to either caller or callee
1360
1361 // Compute entry points. The computation of the entry points is independent of
1362 // patching the call.
1363
1364 // Make sure the callee nmethod does not get deoptimized and removed before
1365 // we are done patching the code.
1366
1367
1368 CompiledICLocker ml(caller_nm);
1369 if (is_virtual && !is_optimized) {
1370 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1371 inline_cache->update(&call_info, receiver->klass());
1372 } else {
1373 // Callsite is a direct call - set it to the destination method
1374 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1375 callsite->set(callee_method);
1376 }
1377
1378 return callee_method;
1379 }
1380
1381 // Inline caches exist only in compiled code
1382 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1383 #ifdef ASSERT
1384 RegisterMap reg_map(current,
1385 RegisterMap::UpdateMap::skip,
1386 RegisterMap::ProcessFrames::include,
1387 RegisterMap::WalkContinuation::skip);
1388 frame stub_frame = current->last_frame();
1389 assert(stub_frame.is_runtime_frame(), "sanity check");
1390 frame caller_frame = stub_frame.sender(®_map);
1391 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1392 #endif /* ASSERT */
1393
1394 methodHandle callee_method;
1395 JRT_BLOCK
1396 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1397 // Return Method* through TLS
1398 current->set_vm_result_2(callee_method());
1399 JRT_BLOCK_END
1400 // return compiled code entry point after potential safepoints
1401 return get_resolved_entry(current, callee_method);
1402 JRT_END
1403
1404
1405 // Handle call site that has been made non-entrant
1406 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1407 // 6243940 We might end up in here if the callee is deoptimized
1408 // as we race to call it. We don't want to take a safepoint if
1409 // the caller was interpreted because the caller frame will look
1410 // interpreted to the stack walkers and arguments are now
1411 // "compiled" so it is much better to make this transition
1412 // invisible to the stack walking code. The i2c path will
1413 // place the callee method in the callee_target. It is stashed
1414 // there because if we try and find the callee by normal means a
1415 // safepoint is possible and have trouble gc'ing the compiled args.
1416 RegisterMap reg_map(current,
1417 RegisterMap::UpdateMap::skip,
1418 RegisterMap::ProcessFrames::include,
1419 RegisterMap::WalkContinuation::skip);
1420 frame stub_frame = current->last_frame();
1421 assert(stub_frame.is_runtime_frame(), "sanity check");
1422 frame caller_frame = stub_frame.sender(®_map);
1423
1424 if (caller_frame.is_interpreted_frame() ||
1425 caller_frame.is_entry_frame() ||
1426 caller_frame.is_upcall_stub_frame()) {
1427 Method* callee = current->callee_target();
1428 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1429 current->set_vm_result_2(callee);
1430 current->set_callee_target(nullptr);
1431 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1432 // Bypass class initialization checks in c2i when caller is in native.
1433 // JNI calls to static methods don't have class initialization checks.
1434 // Fast class initialization checks are present in c2i adapters and call into
1435 // SharedRuntime::handle_wrong_method() on the slow path.
1436 //
1437 // JVM upcalls may land here as well, but there's a proper check present in
1438 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1439 // so bypassing it in c2i adapter is benign.
1440 return callee->get_c2i_no_clinit_check_entry();
1441 } else {
1442 return callee->get_c2i_entry();
1443 }
1444 }
1445
1446 // Must be compiled to compiled path which is safe to stackwalk
1447 methodHandle callee_method;
1448 JRT_BLOCK
1449 // Force resolving of caller (if we called from compiled frame)
1450 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1451 current->set_vm_result_2(callee_method());
1452 JRT_BLOCK_END
1453 // return compiled code entry point after potential safepoints
1454 return get_resolved_entry(current, callee_method);
1455 JRT_END
1456
1457 // Handle abstract method call
1458 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1459 // Verbose error message for AbstractMethodError.
1460 // Get the called method from the invoke bytecode.
1461 vframeStream vfst(current, true);
1462 assert(!vfst.at_end(), "Java frame must exist");
1463 methodHandle caller(current, vfst.method());
1464 Bytecode_invoke invoke(caller, vfst.bci());
1465 DEBUG_ONLY( invoke.verify(); )
1466
1467 // Find the compiled caller frame.
1468 RegisterMap reg_map(current,
1469 RegisterMap::UpdateMap::include,
1470 RegisterMap::ProcessFrames::include,
1471 RegisterMap::WalkContinuation::skip);
1472 frame stubFrame = current->last_frame();
1473 assert(stubFrame.is_runtime_frame(), "must be");
1474 frame callerFrame = stubFrame.sender(®_map);
1475 assert(callerFrame.is_compiled_frame(), "must be");
1476
1477 // Install exception and return forward entry.
1478 address res = StubRoutines::throw_AbstractMethodError_entry();
1479 JRT_BLOCK
1480 methodHandle callee(current, invoke.static_target(current));
1481 if (!callee.is_null()) {
1482 oop recv = callerFrame.retrieve_receiver(®_map);
1483 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1484 res = StubRoutines::forward_exception_entry();
1485 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1486 }
1487 JRT_BLOCK_END
1488 return res;
1489 JRT_END
1490
1491 // return verified_code_entry if interp_only_mode is not set for the current thread;
1492 // otherwise return c2i entry.
1493 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method) {
1494 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1495 // In interp_only_mode we need to go to the interpreted entry
1496 // The c2i won't patch in this mode -- see fixup_callers_callsite
1497 return callee_method->get_c2i_entry();
1498 }
1499 assert(callee_method->verified_code_entry() != nullptr, " Jump to zero!");
1500 return callee_method->verified_code_entry();
1501 }
1502
1503 // resolve a static call and patch code
1504 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1505 methodHandle callee_method;
1506 bool enter_special = false;
1507 JRT_BLOCK
1508 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1509 current->set_vm_result_2(callee_method());
1510 JRT_BLOCK_END
1511 // return compiled code entry point after potential safepoints
1512 return get_resolved_entry(current, callee_method);
1513 JRT_END
1514
1515 // resolve virtual call and update inline cache to monomorphic
1516 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1517 methodHandle callee_method;
1518 JRT_BLOCK
1519 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1520 current->set_vm_result_2(callee_method());
1521 JRT_BLOCK_END
1522 // return compiled code entry point after potential safepoints
1523 return get_resolved_entry(current, callee_method);
1524 JRT_END
1525
1526
1527 // Resolve a virtual call that can be statically bound (e.g., always
1528 // monomorphic, so it has no inline cache). Patch code to resolved target.
1529 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1530 methodHandle callee_method;
1531 JRT_BLOCK
1532 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1533 current->set_vm_result_2(callee_method());
1534 JRT_BLOCK_END
1535 // return compiled code entry point after potential safepoints
1536 return get_resolved_entry(current, callee_method);
1537 JRT_END
1538
1539 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1540 JavaThread* current = THREAD;
1541 ResourceMark rm(current);
1542 CallInfo call_info;
1543 Bytecodes::Code bc;
1544
1545 // receiver is null for static calls. An exception is thrown for null
1546 // receivers for non-static calls
1547 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1548
1549 methodHandle callee_method(current, call_info.selected_method());
1550
1551 #ifndef PRODUCT
1552 Atomic::inc(&_ic_miss_ctr);
1553
1554 // Statistics & Tracing
1555 if (TraceCallFixup) {
1556 ResourceMark rm(current);
1557 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1558 callee_method->print_short_name(tty);
1559 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1560 }
1561
1562 if (ICMissHistogram) {
1563 MutexLocker m(VMStatistic_lock);
1564 RegisterMap reg_map(current,
1565 RegisterMap::UpdateMap::skip,
1566 RegisterMap::ProcessFrames::include,
1567 RegisterMap::WalkContinuation::skip);
1568 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1569 // produce statistics under the lock
1570 trace_ic_miss(f.pc());
1571 }
1572 #endif
1573
1574 // install an event collector so that when a vtable stub is created the
1575 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1576 // event can't be posted when the stub is created as locks are held
1577 // - instead the event will be deferred until the event collector goes
1578 // out of scope.
1579 JvmtiDynamicCodeEventCollector event_collector;
1580
1581 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1582 RegisterMap reg_map(current,
1583 RegisterMap::UpdateMap::skip,
1584 RegisterMap::ProcessFrames::include,
1585 RegisterMap::WalkContinuation::skip);
1586 frame caller_frame = current->last_frame().sender(®_map);
1587 CodeBlob* cb = caller_frame.cb();
1588 nmethod* caller_nm = cb->as_nmethod();
1589
1590 CompiledICLocker ml(caller_nm);
1591 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1592 inline_cache->update(&call_info, receiver()->klass());
1593
1594 return callee_method;
1595 }
1596
1597 //
1598 // Resets a call-site in compiled code so it will get resolved again.
1599 // This routines handles both virtual call sites, optimized virtual call
1600 // sites, and static call sites. Typically used to change a call sites
1601 // destination from compiled to interpreted.
1602 //
1603 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1604 JavaThread* current = THREAD;
1605 ResourceMark rm(current);
1606 RegisterMap reg_map(current,
1607 RegisterMap::UpdateMap::skip,
1608 RegisterMap::ProcessFrames::include,
1609 RegisterMap::WalkContinuation::skip);
1610 frame stub_frame = current->last_frame();
1611 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1612 frame caller = stub_frame.sender(®_map);
1613
1614 // Do nothing if the frame isn't a live compiled frame.
1615 // nmethod could be deoptimized by the time we get here
1616 // so no update to the caller is needed.
1617
1618 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1619 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1620
1621 address pc = caller.pc();
1622
1623 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1624 assert(caller_nm != nullptr, "did not find caller nmethod");
1625
1626 // Default call_addr is the location of the "basic" call.
1627 // Determine the address of the call we a reresolving. With
1628 // Inline Caches we will always find a recognizable call.
1629 // With Inline Caches disabled we may or may not find a
1630 // recognizable call. We will always find a call for static
1631 // calls and for optimized virtual calls. For vanilla virtual
1632 // calls it depends on the state of the UseInlineCaches switch.
1633 //
1634 // With Inline Caches disabled we can get here for a virtual call
1635 // for two reasons:
1636 // 1 - calling an abstract method. The vtable for abstract methods
1637 // will run us thru handle_wrong_method and we will eventually
1638 // end up in the interpreter to throw the ame.
1639 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1640 // call and between the time we fetch the entry address and
1641 // we jump to it the target gets deoptimized. Similar to 1
1642 // we will wind up in the interprter (thru a c2i with c2).
1643 //
1644 CompiledICLocker ml(caller_nm);
1645 address call_addr = caller_nm->call_instruction_address(pc);
1646
1647 if (call_addr != nullptr) {
1648 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1649 // bytes back in the instruction stream so we must also check for reloc info.
1650 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1651 bool ret = iter.next(); // Get item
1652 if (ret) {
1653 switch (iter.type()) {
1654 case relocInfo::static_call_type:
1655 case relocInfo::opt_virtual_call_type: {
1656 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1657 cdc->set_to_clean();
1658 break;
1659 }
1660
1661 case relocInfo::virtual_call_type: {
1662 // compiled, dispatched call (which used to call an interpreted method)
1663 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1664 inline_cache->set_to_clean();
1665 break;
1666 }
1667 default:
1668 break;
1669 }
1670 }
1671 }
1672 }
1673
1674 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1675
1676
1677 #ifndef PRODUCT
1678 Atomic::inc(&_wrong_method_ctr);
1679
1680 if (TraceCallFixup) {
1681 ResourceMark rm(current);
1682 tty->print("handle_wrong_method reresolving call to");
1683 callee_method->print_short_name(tty);
1684 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1685 }
1686 #endif
1687
1688 return callee_method;
1689 }
1690
1691 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1692 // The faulting unsafe accesses should be changed to throw the error
1693 // synchronously instead. Meanwhile the faulting instruction will be
1694 // skipped over (effectively turning it into a no-op) and an
1695 // asynchronous exception will be raised which the thread will
1696 // handle at a later point. If the instruction is a load it will
1697 // return garbage.
1698
1699 // Request an async exception.
1700 thread->set_pending_unsafe_access_error();
1701
1702 // Return address of next instruction to execute.
1703 return next_pc;
1704 }
1705
1706 #ifdef ASSERT
1707 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1708 const BasicType* sig_bt,
1709 const VMRegPair* regs) {
1710 ResourceMark rm;
1711 const int total_args_passed = method->size_of_parameters();
1712 const VMRegPair* regs_with_member_name = regs;
1713 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1714
1715 const int member_arg_pos = total_args_passed - 1;
1716 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1717 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1718
1719 java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1);
1720
1721 for (int i = 0; i < member_arg_pos; i++) {
1722 VMReg a = regs_with_member_name[i].first();
1723 VMReg b = regs_without_member_name[i].first();
1724 assert(a->value() == b->value(), "register allocation mismatch: a= %d, b= %d", a->value(), b->value());
1725 }
1726 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1727 }
1728 #endif
1729
1730 // ---------------------------------------------------------------------------
1731 // We are calling the interpreter via a c2i. Normally this would mean that
1732 // we were called by a compiled method. However we could have lost a race
1733 // where we went int -> i2c -> c2i and so the caller could in fact be
1734 // interpreted. If the caller is compiled we attempt to patch the caller
1735 // so he no longer calls into the interpreter.
1736 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1737 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1738
1739 // It's possible that deoptimization can occur at a call site which hasn't
1740 // been resolved yet, in which case this function will be called from
1741 // an nmethod that has been patched for deopt and we can ignore the
1742 // request for a fixup.
1743 // Also it is possible that we lost a race in that from_compiled_entry
1744 // is now back to the i2c in that case we don't need to patch and if
1745 // we did we'd leap into space because the callsite needs to use
1746 // "to interpreter" stub in order to load up the Method*. Don't
1747 // ask me how I know this...
1748
1749 // Result from nmethod::is_unloading is not stable across safepoints.
1750 NoSafepointVerifier nsv;
1751
1752 nmethod* callee = method->code();
1753 if (callee == nullptr) {
1754 return;
1755 }
1756
1757 // write lock needed because we might patch call site by set_to_clean()
1758 // and is_unloading() can modify nmethod's state
1759 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, JavaThread::current()));
1760
1761 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1762 if (cb == nullptr || !cb->is_nmethod() || !callee->is_in_use() || callee->is_unloading()) {
1763 return;
1764 }
1765
1766 // The check above makes sure this is an nmethod.
1767 nmethod* caller = cb->as_nmethod();
1768
1769 // Get the return PC for the passed caller PC.
1770 address return_pc = caller_pc + frame::pc_return_offset;
1771
1772 if (!caller->is_in_use() || !NativeCall::is_call_before(return_pc)) {
1773 return;
1774 }
1775
1776 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1777 CompiledICLocker ic_locker(caller);
1778 ResourceMark rm;
1779
1780 // If we got here through a static call or opt_virtual call, then we know where the
1781 // call address would be; let's peek at it
1782 address callsite_addr = (address)nativeCall_before(return_pc);
1783 RelocIterator iter(caller, callsite_addr, callsite_addr + 1);
1784 if (!iter.next()) {
1785 // No reloc entry found; not a static or optimized virtual call
1786 return;
1787 }
1788
1789 relocInfo::relocType type = iter.reloc()->type();
1790 if (type != relocInfo::static_call_type &&
1791 type != relocInfo::opt_virtual_call_type) {
1792 return;
1793 }
1794
1795 CompiledDirectCall* callsite = CompiledDirectCall::before(return_pc);
1796 callsite->set_to_clean();
1797 JRT_END
1798
1799
1800 // same as JVM_Arraycopy, but called directly from compiled code
1801 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1802 oopDesc* dest, jint dest_pos,
1803 jint length,
1804 JavaThread* current)) {
1805 #ifndef PRODUCT
1806 _slow_array_copy_ctr++;
1807 #endif
1808 // Check if we have null pointers
1809 if (src == nullptr || dest == nullptr) {
1810 THROW(vmSymbols::java_lang_NullPointerException());
1811 }
1812 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1813 // even though the copy_array API also performs dynamic checks to ensure
1814 // that src and dest are truly arrays (and are conformable).
1815 // The copy_array mechanism is awkward and could be removed, but
1816 // the compilers don't call this function except as a last resort,
1817 // so it probably doesn't matter.
1818 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1819 (arrayOopDesc*)dest, dest_pos,
1820 length, current);
1821 }
1822 JRT_END
1823
1824 // The caller of generate_class_cast_message() (or one of its callers)
1825 // must use a ResourceMark in order to correctly free the result.
1826 char* SharedRuntime::generate_class_cast_message(
1827 JavaThread* thread, Klass* caster_klass) {
1828
1829 // Get target class name from the checkcast instruction
1830 vframeStream vfst(thread, true);
1831 assert(!vfst.at_end(), "Java frame must exist");
1832 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1833 constantPoolHandle cpool(thread, vfst.method()->constants());
1834 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1835 Symbol* target_klass_name = nullptr;
1836 if (target_klass == nullptr) {
1837 // This klass should be resolved, but just in case, get the name in the klass slot.
1838 target_klass_name = cpool->klass_name_at(cc.index());
1839 }
1840 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1841 }
1842
1843
1844 // The caller of generate_class_cast_message() (or one of its callers)
1845 // must use a ResourceMark in order to correctly free the result.
1846 char* SharedRuntime::generate_class_cast_message(
1847 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1848 const char* caster_name = caster_klass->external_name();
1849
1850 assert(target_klass != nullptr || target_klass_name != nullptr, "one must be provided");
1851 const char* target_name = target_klass == nullptr ? target_klass_name->as_klass_external_name() :
1852 target_klass->external_name();
1853
1854 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
1855
1856 const char* caster_klass_description = "";
1857 const char* target_klass_description = "";
1858 const char* klass_separator = "";
1859 if (target_klass != nullptr && caster_klass->module() == target_klass->module()) {
1860 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
1861 } else {
1862 caster_klass_description = caster_klass->class_in_module_of_loader();
1863 target_klass_description = (target_klass != nullptr) ? target_klass->class_in_module_of_loader() : "";
1864 klass_separator = (target_klass != nullptr) ? "; " : "";
1865 }
1866
1867 // add 3 for parenthesis and preceding space
1868 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
1869
1870 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1871 if (message == nullptr) {
1872 // Shouldn't happen, but don't cause even more problems if it does
1873 message = const_cast<char*>(caster_klass->external_name());
1874 } else {
1875 jio_snprintf(message,
1876 msglen,
1877 "class %s cannot be cast to class %s (%s%s%s)",
1878 caster_name,
1879 target_name,
1880 caster_klass_description,
1881 klass_separator,
1882 target_klass_description
1883 );
1884 }
1885 return message;
1886 }
1887
1888 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1889 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
1890 JRT_END
1891
1892 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1893 if (!SafepointSynchronize::is_synchronizing()) {
1894 // Only try quick_enter() if we're not trying to reach a safepoint
1895 // so that the calling thread reaches the safepoint more quickly.
1896 if (ObjectSynchronizer::quick_enter(obj, current, lock)) {
1897 return;
1898 }
1899 }
1900 // NO_ASYNC required because an async exception on the state transition destructor
1901 // would leave you with the lock held and it would never be released.
1902 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1903 // and the model is that an exception implies the method failed.
1904 JRT_BLOCK_NO_ASYNC
1905 Handle h_obj(THREAD, obj);
1906 ObjectSynchronizer::enter(h_obj, lock, current);
1907 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1908 JRT_BLOCK_END
1909 }
1910
1911 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1912 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
1913 SharedRuntime::monitor_enter_helper(obj, lock, current);
1914 JRT_END
1915
1916 void SharedRuntime::monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1917 assert(JavaThread::current() == current, "invariant");
1918 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1919 ExceptionMark em(current);
1920 // The object could become unlocked through a JNI call, which we have no other checks for.
1921 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
1922 if (obj->is_unlocked()) {
1923 if (CheckJNICalls) {
1924 fatal("Object has been unlocked by JNI");
1925 }
1926 return;
1927 }
1928 ObjectSynchronizer::exit(obj, lock, current);
1929 }
1930
1931 // Handles the uncommon cases of monitor unlocking in compiled code
1932 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
1933 assert(current == JavaThread::current(), "pre-condition");
1934 SharedRuntime::monitor_exit_helper(obj, lock, current);
1935 JRT_END
1936
1937 // This is only called when CheckJNICalls is true, and only
1938 // for virtual thread termination.
1939 JRT_LEAF(void, SharedRuntime::log_jni_monitor_still_held())
1940 assert(CheckJNICalls, "Only call this when checking JNI usage");
1941 if (log_is_enabled(Debug, jni)) {
1942 JavaThread* current = JavaThread::current();
1943 int64_t vthread_id = java_lang_Thread::thread_id(current->vthread());
1944 int64_t carrier_id = java_lang_Thread::thread_id(current->threadObj());
1945 log_debug(jni)("VirtualThread (tid: " INT64_FORMAT ", carrier id: " INT64_FORMAT
1946 ") exiting with Objects still locked by JNI MonitorEnter.",
1947 vthread_id, carrier_id);
1948 }
1949 JRT_END
1950
1951 #ifndef PRODUCT
1952
1953 void SharedRuntime::print_statistics() {
1954 ttyLocker ttyl;
1955 if (xtty != nullptr) xtty->head("statistics type='SharedRuntime'");
1956
1957 SharedRuntime::print_ic_miss_histogram();
1958
1959 // Dump the JRT_ENTRY counters
1960 if (_new_instance_ctr) tty->print_cr("%5u new instance requires GC", _new_instance_ctr);
1961 if (_new_array_ctr) tty->print_cr("%5u new array requires GC", _new_array_ctr);
1962 if (_multi2_ctr) tty->print_cr("%5u multianewarray 2 dim", _multi2_ctr);
1963 if (_multi3_ctr) tty->print_cr("%5u multianewarray 3 dim", _multi3_ctr);
1964 if (_multi4_ctr) tty->print_cr("%5u multianewarray 4 dim", _multi4_ctr);
1965 if (_multi5_ctr) tty->print_cr("%5u multianewarray 5 dim", _multi5_ctr);
1966
1967 tty->print_cr("%5u inline cache miss in compiled", _ic_miss_ctr);
1968 tty->print_cr("%5u wrong method", _wrong_method_ctr);
1969 tty->print_cr("%5u unresolved static call site", _resolve_static_ctr);
1970 tty->print_cr("%5u unresolved virtual call site", _resolve_virtual_ctr);
1971 tty->print_cr("%5u unresolved opt virtual call site", _resolve_opt_virtual_ctr);
1972
1973 if (_mon_enter_stub_ctr) tty->print_cr("%5u monitor enter stub", _mon_enter_stub_ctr);
1974 if (_mon_exit_stub_ctr) tty->print_cr("%5u monitor exit stub", _mon_exit_stub_ctr);
1975 if (_mon_enter_ctr) tty->print_cr("%5u monitor enter slow", _mon_enter_ctr);
1976 if (_mon_exit_ctr) tty->print_cr("%5u monitor exit slow", _mon_exit_ctr);
1977 if (_partial_subtype_ctr) tty->print_cr("%5u slow partial subtype", _partial_subtype_ctr);
1978 if (_jbyte_array_copy_ctr) tty->print_cr("%5u byte array copies", _jbyte_array_copy_ctr);
1979 if (_jshort_array_copy_ctr) tty->print_cr("%5u short array copies", _jshort_array_copy_ctr);
1980 if (_jint_array_copy_ctr) tty->print_cr("%5u int array copies", _jint_array_copy_ctr);
1981 if (_jlong_array_copy_ctr) tty->print_cr("%5u long array copies", _jlong_array_copy_ctr);
1982 if (_oop_array_copy_ctr) tty->print_cr("%5u oop array copies", _oop_array_copy_ctr);
1983 if (_checkcast_array_copy_ctr) tty->print_cr("%5u checkcast array copies", _checkcast_array_copy_ctr);
1984 if (_unsafe_array_copy_ctr) tty->print_cr("%5u unsafe array copies", _unsafe_array_copy_ctr);
1985 if (_generic_array_copy_ctr) tty->print_cr("%5u generic array copies", _generic_array_copy_ctr);
1986 if (_slow_array_copy_ctr) tty->print_cr("%5u slow array copies", _slow_array_copy_ctr);
1987 if (_find_handler_ctr) tty->print_cr("%5u find exception handler", _find_handler_ctr);
1988 if (_rethrow_ctr) tty->print_cr("%5u rethrow handler", _rethrow_ctr);
1989 if (_unsafe_set_memory_ctr) tty->print_cr("%5u unsafe set memorys", _unsafe_set_memory_ctr);
1990
1991 AdapterHandlerLibrary::print_statistics();
1992
1993 if (xtty != nullptr) xtty->tail("statistics");
1994 }
1995
1996 inline double percent(int64_t x, int64_t y) {
1997 return 100.0 * (double)x / (double)MAX2(y, (int64_t)1);
1998 }
1999
2000 class MethodArityHistogram {
2001 public:
2002 enum { MAX_ARITY = 256 };
2003 private:
2004 static uint64_t _arity_histogram[MAX_ARITY]; // histogram of #args
2005 static uint64_t _size_histogram[MAX_ARITY]; // histogram of arg size in words
2006 static uint64_t _total_compiled_calls;
2007 static uint64_t _max_compiled_calls_per_method;
2008 static int _max_arity; // max. arity seen
2009 static int _max_size; // max. arg size seen
2010
2011 static void add_method_to_histogram(nmethod* nm) {
2012 Method* method = (nm == nullptr) ? nullptr : nm->method();
2013 if (method != nullptr) {
2014 ArgumentCount args(method->signature());
2015 int arity = args.size() + (method->is_static() ? 0 : 1);
2016 int argsize = method->size_of_parameters();
2017 arity = MIN2(arity, MAX_ARITY-1);
2018 argsize = MIN2(argsize, MAX_ARITY-1);
2019 uint64_t count = (uint64_t)method->compiled_invocation_count();
2020 _max_compiled_calls_per_method = count > _max_compiled_calls_per_method ? count : _max_compiled_calls_per_method;
2021 _total_compiled_calls += count;
2022 _arity_histogram[arity] += count;
2023 _size_histogram[argsize] += count;
2024 _max_arity = MAX2(_max_arity, arity);
2025 _max_size = MAX2(_max_size, argsize);
2026 }
2027 }
2028
2029 void print_histogram_helper(int n, uint64_t* histo, const char* name) {
2030 const int N = MIN2(9, n);
2031 double sum = 0;
2032 double weighted_sum = 0;
2033 for (int i = 0; i <= n; i++) { sum += (double)histo[i]; weighted_sum += (double)(i*histo[i]); }
2034 if (sum >= 1) { // prevent divide by zero or divide overflow
2035 double rest = sum;
2036 double percent = sum / 100;
2037 for (int i = 0; i <= N; i++) {
2038 rest -= (double)histo[i];
2039 tty->print_cr("%4d: " UINT64_FORMAT_W(12) " (%5.1f%%)", i, histo[i], (double)histo[i] / percent);
2040 }
2041 tty->print_cr("rest: " INT64_FORMAT_W(12) " (%5.1f%%)", (int64_t)rest, rest / percent);
2042 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2043 tty->print_cr("(total # of compiled calls = " INT64_FORMAT_W(14) ")", _total_compiled_calls);
2044 tty->print_cr("(max # of compiled calls = " INT64_FORMAT_W(14) ")", _max_compiled_calls_per_method);
2045 } else {
2046 tty->print_cr("Histogram generation failed for %s. n = %d, sum = %7.5f", name, n, sum);
2047 }
2048 }
2049
2050 void print_histogram() {
2051 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2052 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2053 tty->print_cr("\nHistogram of parameter block size (in words, incl. rcvr):");
2054 print_histogram_helper(_max_size, _size_histogram, "size");
2055 tty->cr();
2056 }
2057
2058 public:
2059 MethodArityHistogram() {
2060 // Take the Compile_lock to protect against changes in the CodeBlob structures
2061 MutexLocker mu1(Compile_lock, Mutex::_safepoint_check_flag);
2062 // Take the CodeCache_lock to protect against changes in the CodeHeap structure
2063 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2064 _max_arity = _max_size = 0;
2065 _total_compiled_calls = 0;
2066 _max_compiled_calls_per_method = 0;
2067 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2068 CodeCache::nmethods_do(add_method_to_histogram);
2069 print_histogram();
2070 }
2071 };
2072
2073 uint64_t MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2074 uint64_t MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2075 uint64_t MethodArityHistogram::_total_compiled_calls;
2076 uint64_t MethodArityHistogram::_max_compiled_calls_per_method;
2077 int MethodArityHistogram::_max_arity;
2078 int MethodArityHistogram::_max_size;
2079
2080 void SharedRuntime::print_call_statistics(uint64_t comp_total) {
2081 tty->print_cr("Calls from compiled code:");
2082 int64_t total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2083 int64_t mono_c = _nof_normal_calls - _nof_megamorphic_calls;
2084 int64_t mono_i = _nof_interface_calls;
2085 tty->print_cr("\t" INT64_FORMAT_W(12) " (100%%) total non-inlined ", total);
2086 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2087 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2088 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2089 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2090 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2091 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2092 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2093 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2094 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2095 tty->cr();
2096 tty->print_cr("Note 1: counter updates are not MT-safe.");
2097 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2098 tty->print_cr(" %% in nested categories are relative to their category");
2099 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2100 tty->cr();
2101
2102 MethodArityHistogram h;
2103 }
2104 #endif
2105
2106 #ifndef PRODUCT
2107 static int _lookups; // number of calls to lookup
2108 static int _equals; // number of buckets checked with matching hash
2109 static int _hits; // number of successful lookups
2110 static int _compact; // number of equals calls with compact signature
2111 #endif
2112
2113 // A simple wrapper class around the calling convention information
2114 // that allows sharing of adapters for the same calling convention.
2115 class AdapterFingerPrint : public CHeapObj<mtCode> {
2116 private:
2117 enum {
2118 _basic_type_bits = 4,
2119 _basic_type_mask = right_n_bits(_basic_type_bits),
2120 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2121 _compact_int_count = 3
2122 };
2123 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2124 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2125
2126 union {
2127 int _compact[_compact_int_count];
2128 int* _fingerprint;
2129 } _value;
2130 int _length; // A negative length indicates the fingerprint is in the compact form,
2131 // Otherwise _value._fingerprint is the array.
2132
2133 // Remap BasicTypes that are handled equivalently by the adapters.
2134 // These are correct for the current system but someday it might be
2135 // necessary to make this mapping platform dependent.
2136 static int adapter_encoding(BasicType in) {
2137 switch (in) {
2138 case T_BOOLEAN:
2139 case T_BYTE:
2140 case T_SHORT:
2141 case T_CHAR:
2142 // There are all promoted to T_INT in the calling convention
2143 return T_INT;
2144
2145 case T_OBJECT:
2146 case T_ARRAY:
2147 // In other words, we assume that any register good enough for
2148 // an int or long is good enough for a managed pointer.
2149 #ifdef _LP64
2150 return T_LONG;
2151 #else
2152 return T_INT;
2153 #endif
2154
2155 case T_INT:
2156 case T_LONG:
2157 case T_FLOAT:
2158 case T_DOUBLE:
2159 case T_VOID:
2160 return in;
2161
2162 default:
2163 ShouldNotReachHere();
2164 return T_CONFLICT;
2165 }
2166 }
2167
2168 public:
2169 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2170 // The fingerprint is based on the BasicType signature encoded
2171 // into an array of ints with eight entries per int.
2172 int* ptr;
2173 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2174 if (len <= _compact_int_count) {
2175 assert(_compact_int_count == 3, "else change next line");
2176 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2177 // Storing the signature encoded as signed chars hits about 98%
2178 // of the time.
2179 _length = -len;
2180 ptr = _value._compact;
2181 } else {
2182 _length = len;
2183 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2184 ptr = _value._fingerprint;
2185 }
2186
2187 // Now pack the BasicTypes with 8 per int
2188 int sig_index = 0;
2189 for (int index = 0; index < len; index++) {
2190 int value = 0;
2191 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2192 int bt = adapter_encoding(sig_bt[sig_index++]);
2193 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2194 value = (value << _basic_type_bits) | bt;
2195 }
2196 ptr[index] = value;
2197 }
2198 }
2199
2200 ~AdapterFingerPrint() {
2201 if (_length > 0) {
2202 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2203 }
2204 }
2205
2206 int value(int index) {
2207 if (_length < 0) {
2208 return _value._compact[index];
2209 }
2210 return _value._fingerprint[index];
2211 }
2212 int length() {
2213 if (_length < 0) return -_length;
2214 return _length;
2215 }
2216
2217 bool is_compact() {
2218 return _length <= 0;
2219 }
2220
2221 unsigned int compute_hash() {
2222 int hash = 0;
2223 for (int i = 0; i < length(); i++) {
2224 int v = value(i);
2225 hash = (hash << 8) ^ v ^ (hash >> 5);
2226 }
2227 return (unsigned int)hash;
2228 }
2229
2230 const char* as_string() {
2231 stringStream st;
2232 st.print("0x");
2233 for (int i = 0; i < length(); i++) {
2234 st.print("%x", value(i));
2235 }
2236 return st.as_string();
2237 }
2238
2239 #ifndef PRODUCT
2240 // Reconstitutes the basic type arguments from the fingerprint,
2241 // producing strings like LIJDF
2242 const char* as_basic_args_string() {
2243 stringStream st;
2244 bool long_prev = false;
2245 for (int i = 0; i < length(); i++) {
2246 unsigned val = (unsigned)value(i);
2247 // args are packed so that first/lower arguments are in the highest
2248 // bits of each int value, so iterate from highest to the lowest
2249 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2250 unsigned v = (val >> j) & _basic_type_mask;
2251 if (v == 0) {
2252 assert(i == length() - 1, "Only expect zeroes in the last word");
2253 continue;
2254 }
2255 if (long_prev) {
2256 long_prev = false;
2257 if (v == T_VOID) {
2258 st.print("J");
2259 } else {
2260 st.print("L");
2261 }
2262 }
2263 switch (v) {
2264 case T_INT: st.print("I"); break;
2265 case T_LONG: long_prev = true; break;
2266 case T_FLOAT: st.print("F"); break;
2267 case T_DOUBLE: st.print("D"); break;
2268 case T_VOID: break;
2269 default: ShouldNotReachHere();
2270 }
2271 }
2272 }
2273 if (long_prev) {
2274 st.print("L");
2275 }
2276 return st.as_string();
2277 }
2278 #endif // !product
2279
2280 bool equals(AdapterFingerPrint* other) {
2281 if (other->_length != _length) {
2282 return false;
2283 }
2284 if (_length < 0) {
2285 assert(_compact_int_count == 3, "else change next line");
2286 return _value._compact[0] == other->_value._compact[0] &&
2287 _value._compact[1] == other->_value._compact[1] &&
2288 _value._compact[2] == other->_value._compact[2];
2289 } else {
2290 for (int i = 0; i < _length; i++) {
2291 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2292 return false;
2293 }
2294 }
2295 }
2296 return true;
2297 }
2298
2299 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2300 NOT_PRODUCT(_equals++);
2301 return fp1->equals(fp2);
2302 }
2303
2304 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2305 return fp->compute_hash();
2306 }
2307 };
2308
2309 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2310 using AdapterHandlerTable = ResourceHashtable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2311 AnyObj::C_HEAP, mtCode,
2312 AdapterFingerPrint::compute_hash,
2313 AdapterFingerPrint::equals>;
2314 static AdapterHandlerTable* _adapter_handler_table;
2315
2316 // Find a entry with the same fingerprint if it exists
2317 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2318 NOT_PRODUCT(_lookups++);
2319 assert_lock_strong(AdapterHandlerLibrary_lock);
2320 AdapterFingerPrint fp(total_args_passed, sig_bt);
2321 AdapterHandlerEntry** entry = _adapter_handler_table->get(&fp);
2322 if (entry != nullptr) {
2323 #ifndef PRODUCT
2324 if (fp.is_compact()) _compact++;
2325 _hits++;
2326 #endif
2327 return *entry;
2328 }
2329 return nullptr;
2330 }
2331
2332 #ifndef PRODUCT
2333 static void print_table_statistics() {
2334 auto size = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2335 return sizeof(*key) + sizeof(*a);
2336 };
2337 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2338 ts.print(tty, "AdapterHandlerTable");
2339 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2340 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2341 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d compact %d",
2342 _lookups, _equals, _hits, _compact);
2343 }
2344 #endif
2345
2346 // ---------------------------------------------------------------------------
2347 // Implementation of AdapterHandlerLibrary
2348 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = nullptr;
2349 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2350 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2351 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2352 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2353 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2354 const int AdapterHandlerLibrary_size = 16*K;
2355 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2356
2357 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2358 return _buffer;
2359 }
2360
2361 static void post_adapter_creation(const AdapterBlob* new_adapter,
2362 const AdapterHandlerEntry* entry) {
2363 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2364 char blob_id[256];
2365 jio_snprintf(blob_id,
2366 sizeof(blob_id),
2367 "%s(%s)",
2368 new_adapter->name(),
2369 entry->fingerprint()->as_string());
2370 if (Forte::is_enabled()) {
2371 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2372 }
2373
2374 if (JvmtiExport::should_post_dynamic_code_generated()) {
2375 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2376 }
2377 }
2378 }
2379
2380 void AdapterHandlerLibrary::initialize() {
2381 ResourceMark rm;
2382 AdapterBlob* no_arg_blob = nullptr;
2383 AdapterBlob* int_arg_blob = nullptr;
2384 AdapterBlob* obj_arg_blob = nullptr;
2385 AdapterBlob* obj_int_arg_blob = nullptr;
2386 AdapterBlob* obj_obj_arg_blob = nullptr;
2387 {
2388 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2389 MutexLocker mu(AdapterHandlerLibrary_lock);
2390
2391 // Create a special handler for abstract methods. Abstract methods
2392 // are never compiled so an i2c entry is somewhat meaningless, but
2393 // throw AbstractMethodError just in case.
2394 // Pass wrong_method_abstract for the c2i transitions to return
2395 // AbstractMethodError for invalid invocations.
2396 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2397 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, nullptr),
2398 StubRoutines::throw_AbstractMethodError_entry(),
2399 wrong_method_abstract, wrong_method_abstract);
2400
2401 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2402 _no_arg_handler = create_adapter(no_arg_blob, 0, nullptr, true);
2403
2404 BasicType obj_args[] = { T_OBJECT };
2405 _obj_arg_handler = create_adapter(obj_arg_blob, 1, obj_args, true);
2406
2407 BasicType int_args[] = { T_INT };
2408 _int_arg_handler = create_adapter(int_arg_blob, 1, int_args, true);
2409
2410 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2411 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, 2, obj_int_args, true);
2412
2413 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2414 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, 2, obj_obj_args, true);
2415
2416 assert(no_arg_blob != nullptr &&
2417 obj_arg_blob != nullptr &&
2418 int_arg_blob != nullptr &&
2419 obj_int_arg_blob != nullptr &&
2420 obj_obj_arg_blob != nullptr, "Initial adapters must be properly created");
2421 }
2422
2423 // Outside of the lock
2424 post_adapter_creation(no_arg_blob, _no_arg_handler);
2425 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2426 post_adapter_creation(int_arg_blob, _int_arg_handler);
2427 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2428 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2429 }
2430
2431 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2432 address i2c_entry,
2433 address c2i_entry,
2434 address c2i_unverified_entry,
2435 address c2i_no_clinit_check_entry) {
2436 // Insert an entry into the table
2437 return new AdapterHandlerEntry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry,
2438 c2i_no_clinit_check_entry);
2439 }
2440
2441 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2442 if (method->is_abstract()) {
2443 return _abstract_method_handler;
2444 }
2445 int total_args_passed = method->size_of_parameters(); // All args on stack
2446 if (total_args_passed == 0) {
2447 return _no_arg_handler;
2448 } else if (total_args_passed == 1) {
2449 if (!method->is_static()) {
2450 return _obj_arg_handler;
2451 }
2452 switch (method->signature()->char_at(1)) {
2453 case JVM_SIGNATURE_CLASS:
2454 case JVM_SIGNATURE_ARRAY:
2455 return _obj_arg_handler;
2456 case JVM_SIGNATURE_INT:
2457 case JVM_SIGNATURE_BOOLEAN:
2458 case JVM_SIGNATURE_CHAR:
2459 case JVM_SIGNATURE_BYTE:
2460 case JVM_SIGNATURE_SHORT:
2461 return _int_arg_handler;
2462 }
2463 } else if (total_args_passed == 2 &&
2464 !method->is_static()) {
2465 switch (method->signature()->char_at(1)) {
2466 case JVM_SIGNATURE_CLASS:
2467 case JVM_SIGNATURE_ARRAY:
2468 return _obj_obj_arg_handler;
2469 case JVM_SIGNATURE_INT:
2470 case JVM_SIGNATURE_BOOLEAN:
2471 case JVM_SIGNATURE_CHAR:
2472 case JVM_SIGNATURE_BYTE:
2473 case JVM_SIGNATURE_SHORT:
2474 return _obj_int_arg_handler;
2475 }
2476 }
2477 return nullptr;
2478 }
2479
2480 class AdapterSignatureIterator : public SignatureIterator {
2481 private:
2482 BasicType stack_sig_bt[16];
2483 BasicType* sig_bt;
2484 int index;
2485
2486 public:
2487 AdapterSignatureIterator(Symbol* signature,
2488 fingerprint_t fingerprint,
2489 bool is_static,
2490 int total_args_passed) :
2491 SignatureIterator(signature, fingerprint),
2492 index(0)
2493 {
2494 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2495 if (!is_static) { // Pass in receiver first
2496 sig_bt[index++] = T_OBJECT;
2497 }
2498 do_parameters_on(this);
2499 }
2500
2501 BasicType* basic_types() {
2502 return sig_bt;
2503 }
2504
2505 #ifdef ASSERT
2506 int slots() {
2507 return index;
2508 }
2509 #endif
2510
2511 private:
2512
2513 friend class SignatureIterator; // so do_parameters_on can call do_type
2514 void do_type(BasicType type) {
2515 sig_bt[index++] = type;
2516 if (type == T_LONG || type == T_DOUBLE) {
2517 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2518 }
2519 }
2520 };
2521
2522 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2523 // Use customized signature handler. Need to lock around updates to
2524 // the _adapter_handler_table (it is not safe for concurrent readers
2525 // and a single writer: this could be fixed if it becomes a
2526 // problem).
2527
2528 // Fast-path for trivial adapters
2529 AdapterHandlerEntry* entry = get_simple_adapter(method);
2530 if (entry != nullptr) {
2531 return entry;
2532 }
2533
2534 ResourceMark rm;
2535 AdapterBlob* new_adapter = nullptr;
2536
2537 // Fill in the signature array, for the calling-convention call.
2538 int total_args_passed = method->size_of_parameters(); // All args on stack
2539
2540 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2541 method->is_static(), total_args_passed);
2542 assert(si.slots() == total_args_passed, "");
2543 BasicType* sig_bt = si.basic_types();
2544 {
2545 MutexLocker mu(AdapterHandlerLibrary_lock);
2546
2547 // Lookup method signature's fingerprint
2548 entry = lookup(total_args_passed, sig_bt);
2549
2550 if (entry != nullptr) {
2551 #ifdef ASSERT
2552 if (VerifyAdapterSharing) {
2553 AdapterBlob* comparison_blob = nullptr;
2554 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, total_args_passed, sig_bt, false);
2555 assert(comparison_blob == nullptr, "no blob should be created when creating an adapter for comparison");
2556 assert(comparison_entry->compare_code(entry), "code must match");
2557 // Release the one just created and return the original
2558 delete comparison_entry;
2559 }
2560 #endif
2561 return entry;
2562 }
2563
2564 entry = create_adapter(new_adapter, total_args_passed, sig_bt, /* allocate_code_blob */ true);
2565 }
2566
2567 // Outside of the lock
2568 if (new_adapter != nullptr) {
2569 post_adapter_creation(new_adapter, entry);
2570 }
2571 return entry;
2572 }
2573
2574 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& new_adapter,
2575 int total_args_passed,
2576 BasicType* sig_bt,
2577 bool allocate_code_blob) {
2578 if (log_is_enabled(Info, perf, class, link)) {
2579 ClassLoader::perf_method_adapters_count()->inc();
2580 }
2581
2582 // StubRoutines::_final_stubs_code is initialized after this function can be called. As a result,
2583 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated prior
2584 // to all StubRoutines::_final_stubs_code being set. Checks refer to runtime range checks generated
2585 // in an I2C stub that ensure that an I2C stub is called from an interpreter frame or stubs.
2586 bool contains_all_checks = StubRoutines::final_stubs_code() != nullptr;
2587
2588 VMRegPair stack_regs[16];
2589 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2590
2591 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2592 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2593 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2594 CodeBuffer buffer(buf);
2595 short buffer_locs[20];
2596 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2597 sizeof(buffer_locs)/sizeof(relocInfo));
2598
2599 // Make a C heap allocated version of the fingerprint to store in the adapter
2600 AdapterFingerPrint* fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2601 MacroAssembler _masm(&buffer);
2602 AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2603 total_args_passed,
2604 comp_args_on_stack,
2605 sig_bt,
2606 regs,
2607 fingerprint);
2608
2609 #ifdef ASSERT
2610 if (VerifyAdapterSharing) {
2611 entry->save_code(buf->code_begin(), buffer.insts_size());
2612 if (!allocate_code_blob) {
2613 return entry;
2614 }
2615 }
2616 #endif
2617
2618 new_adapter = AdapterBlob::create(&buffer);
2619 NOT_PRODUCT(int insts_size = buffer.insts_size());
2620 if (new_adapter == nullptr) {
2621 // CodeCache is full, disable compilation
2622 // Ought to log this but compile log is only per compile thread
2623 // and we're some non descript Java thread.
2624 return nullptr;
2625 }
2626 entry->relocate(new_adapter->content_begin());
2627 #ifndef PRODUCT
2628 // debugging support
2629 if (PrintAdapterHandlers || PrintStubCode) {
2630 ttyLocker ttyl;
2631 entry->print_adapter_on(tty);
2632 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2633 _adapter_handler_table->number_of_entries(), fingerprint->as_basic_args_string(),
2634 fingerprint->as_string(), insts_size);
2635 tty->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(entry->get_c2i_entry()));
2636 if (Verbose || PrintStubCode) {
2637 address first_pc = entry->base_address();
2638 if (first_pc != nullptr) {
2639 Disassembler::decode(first_pc, first_pc + insts_size, tty
2640 NOT_PRODUCT(COMMA &new_adapter->asm_remarks()));
2641 tty->cr();
2642 }
2643 }
2644 }
2645 #endif
2646
2647 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2648 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2649 if (contains_all_checks || !VerifyAdapterCalls) {
2650 assert_lock_strong(AdapterHandlerLibrary_lock);
2651 _adapter_handler_table->put(fingerprint, entry);
2652 }
2653 return entry;
2654 }
2655
2656 address AdapterHandlerEntry::base_address() {
2657 address base = _i2c_entry;
2658 if (base == nullptr) base = _c2i_entry;
2659 assert(base <= _c2i_entry || _c2i_entry == nullptr, "");
2660 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == nullptr, "");
2661 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == nullptr, "");
2662 return base;
2663 }
2664
2665 void AdapterHandlerEntry::relocate(address new_base) {
2666 address old_base = base_address();
2667 assert(old_base != nullptr, "");
2668 ptrdiff_t delta = new_base - old_base;
2669 if (_i2c_entry != nullptr)
2670 _i2c_entry += delta;
2671 if (_c2i_entry != nullptr)
2672 _c2i_entry += delta;
2673 if (_c2i_unverified_entry != nullptr)
2674 _c2i_unverified_entry += delta;
2675 if (_c2i_no_clinit_check_entry != nullptr)
2676 _c2i_no_clinit_check_entry += delta;
2677 assert(base_address() == new_base, "");
2678 }
2679
2680
2681 AdapterHandlerEntry::~AdapterHandlerEntry() {
2682 delete _fingerprint;
2683 #ifdef ASSERT
2684 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2685 #endif
2686 }
2687
2688
2689 #ifdef ASSERT
2690 // Capture the code before relocation so that it can be compared
2691 // against other versions. If the code is captured after relocation
2692 // then relative instructions won't be equivalent.
2693 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2694 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2695 _saved_code_length = length;
2696 memcpy(_saved_code, buffer, length);
2697 }
2698
2699
2700 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
2701 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
2702
2703 if (other->_saved_code_length != _saved_code_length) {
2704 return false;
2705 }
2706
2707 return memcmp(other->_saved_code, _saved_code, _saved_code_length) == 0;
2708 }
2709 #endif
2710
2711
2712 /**
2713 * Create a native wrapper for this native method. The wrapper converts the
2714 * Java-compiled calling convention to the native convention, handles
2715 * arguments, and transitions to native. On return from the native we transition
2716 * back to java blocking if a safepoint is in progress.
2717 */
2718 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2719 ResourceMark rm;
2720 nmethod* nm = nullptr;
2721
2722 // Check if memory should be freed before allocation
2723 CodeCache::gc_on_allocation();
2724
2725 assert(method->is_native(), "must be native");
2726 assert(method->is_special_native_intrinsic() ||
2727 method->has_native_function(), "must have something valid to call!");
2728
2729 {
2730 // Perform the work while holding the lock, but perform any printing outside the lock
2731 MutexLocker mu(AdapterHandlerLibrary_lock);
2732 // See if somebody beat us to it
2733 if (method->code() != nullptr) {
2734 return;
2735 }
2736
2737 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2738 assert(compile_id > 0, "Must generate native wrapper");
2739
2740
2741 ResourceMark rm;
2742 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2743 if (buf != nullptr) {
2744 CodeBuffer buffer(buf);
2745
2746 if (method->is_continuation_enter_intrinsic()) {
2747 buffer.initialize_stubs_size(192);
2748 }
2749
2750 struct { double data[20]; } locs_buf;
2751 struct { double data[20]; } stubs_locs_buf;
2752 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2753 #if defined(AARCH64) || defined(PPC64)
2754 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
2755 // in the constant pool to ensure ordering between the barrier and oops
2756 // accesses. For native_wrappers we need a constant.
2757 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
2758 // static java call that is resolved in the runtime.
2759 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
2760 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
2761 }
2762 #endif
2763 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
2764 MacroAssembler _masm(&buffer);
2765
2766 // Fill in the signature array, for the calling-convention call.
2767 const int total_args_passed = method->size_of_parameters();
2768
2769 VMRegPair stack_regs[16];
2770 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2771
2772 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2773 method->is_static(), total_args_passed);
2774 BasicType* sig_bt = si.basic_types();
2775 assert(si.slots() == total_args_passed, "");
2776 BasicType ret_type = si.return_type();
2777
2778 // Now get the compiled-Java arguments layout.
2779 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2780
2781 // Generate the compiled-to-native wrapper code
2782 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2783
2784 if (nm != nullptr) {
2785 {
2786 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
2787 if (nm->make_in_use()) {
2788 method->set_code(method, nm);
2789 }
2790 }
2791
2792 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
2793 if (directive->PrintAssemblyOption) {
2794 nm->print_code();
2795 }
2796 DirectivesStack::release(directive);
2797 }
2798 }
2799 } // Unlock AdapterHandlerLibrary_lock
2800
2801
2802 // Install the generated code.
2803 if (nm != nullptr) {
2804 const char *msg = method->is_static() ? "(static)" : "";
2805 CompileTask::print_ul(nm, msg);
2806 if (PrintCompilation) {
2807 ttyLocker ttyl;
2808 CompileTask::print(tty, nm, msg);
2809 }
2810 nm->post_compiled_method_load_event();
2811 }
2812 }
2813
2814 // -------------------------------------------------------------------------
2815 // Java-Java calling convention
2816 // (what you use when Java calls Java)
2817
2818 //------------------------------name_for_receiver----------------------------------
2819 // For a given signature, return the VMReg for parameter 0.
2820 VMReg SharedRuntime::name_for_receiver() {
2821 VMRegPair regs;
2822 BasicType sig_bt = T_OBJECT;
2823 (void) java_calling_convention(&sig_bt, ®s, 1);
2824 // Return argument 0 register. In the LP64 build pointers
2825 // take 2 registers, but the VM wants only the 'main' name.
2826 return regs.first();
2827 }
2828
2829 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2830 // This method is returning a data structure allocating as a
2831 // ResourceObject, so do not put any ResourceMarks in here.
2832
2833 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2834 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2835 int cnt = 0;
2836 if (has_receiver) {
2837 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2838 }
2839
2840 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
2841 BasicType type = ss.type();
2842 sig_bt[cnt++] = type;
2843 if (is_double_word_type(type))
2844 sig_bt[cnt++] = T_VOID;
2845 }
2846
2847 if (has_appendix) {
2848 sig_bt[cnt++] = T_OBJECT;
2849 }
2850
2851 assert(cnt < 256, "grow table size");
2852
2853 int comp_args_on_stack;
2854 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt);
2855
2856 // the calling convention doesn't count out_preserve_stack_slots so
2857 // we must add that in to get "true" stack offsets.
2858
2859 if (comp_args_on_stack) {
2860 for (int i = 0; i < cnt; i++) {
2861 VMReg reg1 = regs[i].first();
2862 if (reg1->is_stack()) {
2863 // Yuck
2864 reg1 = reg1->bias(out_preserve_stack_slots());
2865 }
2866 VMReg reg2 = regs[i].second();
2867 if (reg2->is_stack()) {
2868 // Yuck
2869 reg2 = reg2->bias(out_preserve_stack_slots());
2870 }
2871 regs[i].set_pair(reg2, reg1);
2872 }
2873 }
2874
2875 // results
2876 *arg_size = cnt;
2877 return regs;
2878 }
2879
2880 // OSR Migration Code
2881 //
2882 // This code is used convert interpreter frames into compiled frames. It is
2883 // called from very start of a compiled OSR nmethod. A temp array is
2884 // allocated to hold the interesting bits of the interpreter frame. All
2885 // active locks are inflated to allow them to move. The displaced headers and
2886 // active interpreter locals are copied into the temp buffer. Then we return
2887 // back to the compiled code. The compiled code then pops the current
2888 // interpreter frame off the stack and pushes a new compiled frame. Then it
2889 // copies the interpreter locals and displaced headers where it wants.
2890 // Finally it calls back to free the temp buffer.
2891 //
2892 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2893
2894 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *current) )
2895 assert(current == JavaThread::current(), "pre-condition");
2896
2897 // During OSR migration, we unwind the interpreted frame and replace it with a compiled
2898 // frame. The stack watermark code below ensures that the interpreted frame is processed
2899 // before it gets unwound. This is helpful as the size of the compiled frame could be
2900 // larger than the interpreted frame, which could result in the new frame not being
2901 // processed correctly.
2902 StackWatermarkSet::before_unwind(current);
2903
2904 //
2905 // This code is dependent on the memory layout of the interpreter local
2906 // array and the monitors. On all of our platforms the layout is identical
2907 // so this code is shared. If some platform lays the their arrays out
2908 // differently then this code could move to platform specific code or
2909 // the code here could be modified to copy items one at a time using
2910 // frame accessor methods and be platform independent.
2911
2912 frame fr = current->last_frame();
2913 assert(fr.is_interpreted_frame(), "");
2914 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
2915
2916 // Figure out how many monitors are active.
2917 int active_monitor_count = 0;
2918 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2919 kptr < fr.interpreter_frame_monitor_begin();
2920 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2921 if (kptr->obj() != nullptr) active_monitor_count++;
2922 }
2923
2924 // QQQ we could place number of active monitors in the array so that compiled code
2925 // could double check it.
2926
2927 Method* moop = fr.interpreter_frame_method();
2928 int max_locals = moop->max_locals();
2929 // Allocate temp buffer, 1 word per local & 2 per active monitor
2930 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
2931 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2932
2933 // Copy the locals. Order is preserved so that loading of longs works.
2934 // Since there's no GC I can copy the oops blindly.
2935 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2936 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2937 (HeapWord*)&buf[0],
2938 max_locals);
2939
2940 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2941 int i = max_locals;
2942 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2943 kptr2 < fr.interpreter_frame_monitor_begin();
2944 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2945 if (kptr2->obj() != nullptr) { // Avoid 'holes' in the monitor array
2946 BasicLock *lock = kptr2->lock();
2947 if (LockingMode == LM_LEGACY) {
2948 // Inflate so the object's header no longer refers to the BasicLock.
2949 if (lock->displaced_header().is_unlocked()) {
2950 // The object is locked and the resulting ObjectMonitor* will also be
2951 // locked so it can't be async deflated until ownership is dropped.
2952 // See the big comment in basicLock.cpp: BasicLock::move_to().
2953 ObjectSynchronizer::inflate_helper(kptr2->obj());
2954 }
2955 // Now the displaced header is free to move because the
2956 // object's header no longer refers to it.
2957 buf[i] = (intptr_t)lock->displaced_header().value();
2958 } else if (UseObjectMonitorTable) {
2959 buf[i] = (intptr_t)lock->object_monitor_cache();
2960 }
2961 #ifdef ASSERT
2962 else {
2963 buf[i] = badDispHeaderOSR;
2964 }
2965 #endif
2966 i++;
2967 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2968 }
2969 }
2970 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
2971
2972 RegisterMap map(current,
2973 RegisterMap::UpdateMap::skip,
2974 RegisterMap::ProcessFrames::include,
2975 RegisterMap::WalkContinuation::skip);
2976 frame sender = fr.sender(&map);
2977 if (sender.is_interpreted_frame()) {
2978 current->push_cont_fastpath(sender.sp());
2979 }
2980
2981 return buf;
2982 JRT_END
2983
2984 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2985 FREE_C_HEAP_ARRAY(intptr_t, buf);
2986 JRT_END
2987
2988 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
2989 bool found = false;
2990 auto findblob = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2991 return (found = (b == CodeCache::find_blob(a->get_i2c_entry())));
2992 };
2993 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
2994 _adapter_handler_table->iterate(findblob);
2995 return found;
2996 }
2997
2998 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
2999 bool found = false;
3000 auto findblob = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3001 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3002 found = true;
3003 st->print("Adapter for signature: ");
3004 a->print_adapter_on(st);
3005 return true;
3006 } else {
3007 return false; // keep looking
3008 }
3009 };
3010 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3011 _adapter_handler_table->iterate(findblob);
3012 assert(found, "Should have found handler");
3013 }
3014
3015 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3016 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3017 if (get_i2c_entry() != nullptr) {
3018 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3019 }
3020 if (get_c2i_entry() != nullptr) {
3021 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3022 }
3023 if (get_c2i_unverified_entry() != nullptr) {
3024 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3025 }
3026 if (get_c2i_no_clinit_check_entry() != nullptr) {
3027 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3028 }
3029 st->cr();
3030 }
3031
3032 #ifndef PRODUCT
3033
3034 void AdapterHandlerLibrary::print_statistics() {
3035 print_table_statistics();
3036 }
3037
3038 #endif /* PRODUCT */
3039
3040 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3041 assert(current == JavaThread::current(), "pre-condition");
3042 StackOverflow* overflow_state = current->stack_overflow_state();
3043 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3044 overflow_state->set_reserved_stack_activation(current->stack_base());
3045 JRT_END
3046
3047 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* current, frame fr) {
3048 ResourceMark rm(current);
3049 frame activation;
3050 nmethod* nm = nullptr;
3051 int count = 1;
3052
3053 assert(fr.is_java_frame(), "Must start on Java frame");
3054
3055 RegisterMap map(JavaThread::current(),
3056 RegisterMap::UpdateMap::skip,
3057 RegisterMap::ProcessFrames::skip,
3058 RegisterMap::WalkContinuation::skip); // don't walk continuations
3059 for (; !fr.is_first_frame(); fr = fr.sender(&map)) {
3060 if (!fr.is_java_frame()) {
3061 continue;
3062 }
3063
3064 Method* method = nullptr;
3065 bool found = false;
3066 if (fr.is_interpreted_frame()) {
3067 method = fr.interpreter_frame_method();
3068 if (method != nullptr && method->has_reserved_stack_access()) {
3069 found = true;
3070 }
3071 } else {
3072 CodeBlob* cb = fr.cb();
3073 if (cb != nullptr && cb->is_nmethod()) {
3074 nm = cb->as_nmethod();
3075 method = nm->method();
3076 // scope_desc_near() must be used, instead of scope_desc_at() because on
3077 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3078 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != nullptr; sd = sd->sender()) {
3079 method = sd->method();
3080 if (method != nullptr && method->has_reserved_stack_access()) {
3081 found = true;
3082 }
3083 }
3084 }
3085 }
3086 if (found) {
3087 activation = fr;
3088 warning("Potentially dangerous stack overflow in "
3089 "ReservedStackAccess annotated method %s [%d]",
3090 method->name_and_sig_as_C_string(), count++);
3091 EventReservedStackActivation event;
3092 if (event.should_commit()) {
3093 event.set_method(method);
3094 event.commit();
3095 }
3096 }
3097 }
3098 return activation;
3099 }
3100
3101 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3102 // After any safepoint, just before going back to compiled code,
3103 // we inform the GC that we will be doing initializing writes to
3104 // this object in the future without emitting card-marks, so
3105 // GC may take any compensating steps.
3106
3107 oop new_obj = current->vm_result();
3108 if (new_obj == nullptr) return;
3109
3110 BarrierSet *bs = BarrierSet::barrier_set();
3111 bs->on_slowpath_allocation_exit(current, new_obj);
3112 }