1 /*
2 * Copyright (c) 1997, 2016, 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/stringTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/compiledIC.hpp"
31 #include "code/codeCacheExtensions.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "gc/shared/gcLocker.inline.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "interpreter/interpreterRuntime.hpp"
40 #include "logging/log.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/klass.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/forte.hpp"
48 #include "prims/jvmtiExport.hpp"
49 #include "prims/methodHandles.hpp"
50 #include "prims/nativeLookup.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.hpp"
53 #include "runtime/biasedLocking.hpp"
54 #include "runtime/compilationPolicy.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/init.hpp"
57 #include "runtime/interfaceSupport.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/vframe.hpp"
63 #include "runtime/vframeArray.hpp"
64 #include "trace/tracing.hpp"
65 #include "utilities/copy.hpp"
66 #include "utilities/dtrace.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/hashtable.inline.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/xmlstream.hpp"
71 #ifdef COMPILER1
72 #include "c1/c1_Runtime1.hpp"
73 #endif
74
75 // Shared stub locations
76 RuntimeStub* SharedRuntime::_wrong_method_blob;
77 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
78 RuntimeStub* SharedRuntime::_ic_miss_blob;
79 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
80 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
81 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
82
83 DeoptimizationBlob* SharedRuntime::_deopt_blob;
84 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
85 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
86 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
87
88 #ifdef COMPILER2
89 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
90 #endif // COMPILER2
91
92
93 //----------------------------generate_stubs-----------------------------------
94 void SharedRuntime::generate_stubs() {
95 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
96 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
97 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
98 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
99 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
100 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
101
102 #if defined(COMPILER2) || INCLUDE_JVMCI
103 // Vectors are generated only by C2 and JVMCI.
104 bool support_wide = is_wide_vector(MaxVectorSize);
105 if (support_wide) {
106 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
107 }
108 #endif // COMPILER2 || INCLUDE_JVMCI
109 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
110 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
111
112 generate_deopt_blob();
113
114 #ifdef COMPILER2
115 generate_uncommon_trap_blob();
116 #endif // COMPILER2
117 }
118
119 #include <math.h>
120
121 // Implementation of SharedRuntime
122
123 #ifndef PRODUCT
124 // For statistics
125 int SharedRuntime::_ic_miss_ctr = 0;
126 int SharedRuntime::_wrong_method_ctr = 0;
127 int SharedRuntime::_resolve_static_ctr = 0;
128 int SharedRuntime::_resolve_virtual_ctr = 0;
129 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
130 int SharedRuntime::_implicit_null_throws = 0;
131 int SharedRuntime::_implicit_div0_throws = 0;
132 int SharedRuntime::_throw_null_ctr = 0;
133
134 int SharedRuntime::_nof_normal_calls = 0;
135 int SharedRuntime::_nof_optimized_calls = 0;
136 int SharedRuntime::_nof_inlined_calls = 0;
137 int SharedRuntime::_nof_megamorphic_calls = 0;
138 int SharedRuntime::_nof_static_calls = 0;
139 int SharedRuntime::_nof_inlined_static_calls = 0;
140 int SharedRuntime::_nof_interface_calls = 0;
141 int SharedRuntime::_nof_optimized_interface_calls = 0;
142 int SharedRuntime::_nof_inlined_interface_calls = 0;
143 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
144 int SharedRuntime::_nof_removable_exceptions = 0;
145
146 int SharedRuntime::_new_instance_ctr=0;
147 int SharedRuntime::_new_array_ctr=0;
148 int SharedRuntime::_multi1_ctr=0;
149 int SharedRuntime::_multi2_ctr=0;
150 int SharedRuntime::_multi3_ctr=0;
151 int SharedRuntime::_multi4_ctr=0;
152 int SharedRuntime::_multi5_ctr=0;
153 int SharedRuntime::_mon_enter_stub_ctr=0;
154 int SharedRuntime::_mon_exit_stub_ctr=0;
155 int SharedRuntime::_mon_enter_ctr=0;
156 int SharedRuntime::_mon_exit_ctr=0;
157 int SharedRuntime::_partial_subtype_ctr=0;
158 int SharedRuntime::_jbyte_array_copy_ctr=0;
159 int SharedRuntime::_jshort_array_copy_ctr=0;
160 int SharedRuntime::_jint_array_copy_ctr=0;
161 int SharedRuntime::_jlong_array_copy_ctr=0;
162 int SharedRuntime::_oop_array_copy_ctr=0;
163 int SharedRuntime::_checkcast_array_copy_ctr=0;
164 int SharedRuntime::_unsafe_array_copy_ctr=0;
165 int SharedRuntime::_generic_array_copy_ctr=0;
166 int SharedRuntime::_slow_array_copy_ctr=0;
167 int SharedRuntime::_find_handler_ctr=0;
168 int SharedRuntime::_rethrow_ctr=0;
169
170 int SharedRuntime::_ICmiss_index = 0;
171 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
172 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
173
174
175 void SharedRuntime::trace_ic_miss(address at) {
176 for (int i = 0; i < _ICmiss_index; i++) {
177 if (_ICmiss_at[i] == at) {
178 _ICmiss_count[i]++;
179 return;
180 }
181 }
182 int index = _ICmiss_index++;
183 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
184 _ICmiss_at[index] = at;
185 _ICmiss_count[index] = 1;
186 }
187
188 void SharedRuntime::print_ic_miss_histogram() {
189 if (ICMissHistogram) {
190 tty->print_cr("IC Miss Histogram:");
191 int tot_misses = 0;
192 for (int i = 0; i < _ICmiss_index; i++) {
193 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
194 tot_misses += _ICmiss_count[i];
195 }
196 tty->print_cr("Total IC misses: %7d", tot_misses);
197 }
198 }
199 #endif // PRODUCT
200
201 #if INCLUDE_ALL_GCS
202
203 // G1 write-barrier pre: executed before a pointer store.
204 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
205 if (orig == NULL) {
206 assert(false, "should be optimized out");
207 return;
208 }
209 assert(orig->is_oop(true /* ignore mark word */), "Error");
210 // store the original value that was in the field reference
211 thread->satb_mark_queue().enqueue(orig);
212 JRT_END
213
214 // G1 write-barrier post: executed after a pointer store.
215 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
216 thread->dirty_card_queue().enqueue(card_addr);
217 JRT_END
218
219 #endif // INCLUDE_ALL_GCS
220
221
222 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
223 return x * y;
224 JRT_END
225
226
227 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
228 if (x == min_jlong && y == CONST64(-1)) {
229 return x;
230 } else {
231 return x / y;
232 }
233 JRT_END
234
235
236 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
237 if (x == min_jlong && y == CONST64(-1)) {
238 return 0;
239 } else {
240 return x % y;
241 }
242 JRT_END
243
244
245 const juint float_sign_mask = 0x7FFFFFFF;
246 const juint float_infinity = 0x7F800000;
247 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
248 const julong double_infinity = CONST64(0x7FF0000000000000);
249
250 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
251 #ifdef _WIN64
252 // 64-bit Windows on amd64 returns the wrong values for
253 // infinity operands.
254 union { jfloat f; juint i; } xbits, ybits;
255 xbits.f = x;
256 ybits.f = y;
257 // x Mod Infinity == x unless x is infinity
258 if (((xbits.i & float_sign_mask) != float_infinity) &&
259 ((ybits.i & float_sign_mask) == float_infinity) ) {
260 return x;
261 }
262 return ((jfloat)fmod_winx64((double)x, (double)y));
263 #else
264 return ((jfloat)fmod((double)x,(double)y));
265 #endif
266 JRT_END
267
268
269 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
270 #ifdef _WIN64
271 union { jdouble d; julong l; } xbits, ybits;
272 xbits.d = x;
273 ybits.d = y;
274 // x Mod Infinity == x unless x is infinity
275 if (((xbits.l & double_sign_mask) != double_infinity) &&
276 ((ybits.l & double_sign_mask) == double_infinity) ) {
277 return x;
278 }
279 return ((jdouble)fmod_winx64((double)x, (double)y));
280 #else
281 return ((jdouble)fmod((double)x,(double)y));
282 #endif
283 JRT_END
284
285 #ifdef __SOFTFP__
286 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
287 return x + y;
288 JRT_END
289
290 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
291 return x - y;
292 JRT_END
293
294 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
295 return x * y;
296 JRT_END
297
298 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
299 return x / y;
300 JRT_END
301
302 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
303 return x + y;
304 JRT_END
305
306 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
307 return x - y;
308 JRT_END
309
310 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
311 return x * y;
312 JRT_END
313
314 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
315 return x / y;
316 JRT_END
317
318 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
319 return (jfloat)x;
320 JRT_END
321
322 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
323 return (jdouble)x;
324 JRT_END
325
326 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
327 return (jdouble)x;
328 JRT_END
329
330 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
331 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
332 JRT_END
333
334 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
335 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
336 JRT_END
337
338 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
339 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
340 JRT_END
341
342 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
343 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
344 JRT_END
345
346 // Functions to return the opposite of the aeabi functions for nan.
347 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
348 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
349 JRT_END
350
351 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
352 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
353 JRT_END
354
355 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
356 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
357 JRT_END
358
359 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
360 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
361 JRT_END
362
363 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
364 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
365 JRT_END
366
367 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
368 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
369 JRT_END
370
371 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
372 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
373 JRT_END
374
375 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
376 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
377 JRT_END
378
379 // Intrinsics make gcc generate code for these.
380 float SharedRuntime::fneg(float f) {
381 return -f;
382 }
383
384 double SharedRuntime::dneg(double f) {
385 return -f;
386 }
387
388 #endif // __SOFTFP__
389
390 #if defined(__SOFTFP__) || defined(E500V2)
391 // Intrinsics make gcc generate code for these.
392 double SharedRuntime::dabs(double f) {
393 return (f <= (double)0.0) ? (double)0.0 - f : f;
394 }
395
396 #endif
397
398 #if defined(__SOFTFP__) || defined(PPC)
399 double SharedRuntime::dsqrt(double f) {
400 return sqrt(f);
401 }
402 #endif
403
404 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
405 if (g_isnan(x))
406 return 0;
407 if (x >= (jfloat) max_jint)
408 return max_jint;
409 if (x <= (jfloat) min_jint)
410 return min_jint;
411 return (jint) x;
412 JRT_END
413
414
415 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
416 if (g_isnan(x))
417 return 0;
418 if (x >= (jfloat) max_jlong)
419 return max_jlong;
420 if (x <= (jfloat) min_jlong)
421 return min_jlong;
422 return (jlong) x;
423 JRT_END
424
425
426 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
427 if (g_isnan(x))
428 return 0;
429 if (x >= (jdouble) max_jint)
430 return max_jint;
431 if (x <= (jdouble) min_jint)
432 return min_jint;
433 return (jint) x;
434 JRT_END
435
436
437 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
438 if (g_isnan(x))
439 return 0;
440 if (x >= (jdouble) max_jlong)
441 return max_jlong;
442 if (x <= (jdouble) min_jlong)
443 return min_jlong;
444 return (jlong) x;
445 JRT_END
446
447
448 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
449 return (jfloat)x;
450 JRT_END
451
452
453 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
454 return (jfloat)x;
455 JRT_END
456
457
458 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
459 return (jdouble)x;
460 JRT_END
461
462 // Exception handling across interpreter/compiler boundaries
463 //
464 // exception_handler_for_return_address(...) returns the continuation address.
465 // The continuation address is the entry point of the exception handler of the
466 // previous frame depending on the return address.
467
468 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
469 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
470 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
471
472 // Reset method handle flag.
473 thread->set_is_method_handle_return(false);
474
475 #if INCLUDE_JVMCI
476 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
477 // and other exception handler continuations do not read it
478 thread->set_exception_pc(NULL);
479 #endif
480
481 // The fastest case first
482 CodeBlob* blob = CodeCache::find_blob(return_address);
483 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL;
484 if (nm != NULL) {
485 // Set flag if return address is a method handle call site.
486 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
487 // native nmethods don't have exception handlers
488 assert(!nm->is_native_method(), "no exception handler");
489 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
490 if (nm->is_deopt_pc(return_address)) {
491 // If we come here because of a stack overflow, the stack may be
492 // unguarded. Reguard the stack otherwise if we return to the
493 // deopt blob and the stack bang causes a stack overflow we
494 // crash.
495 bool guard_pages_enabled = thread->stack_guards_enabled();
496 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
497 if (thread->reserved_stack_activation() != thread->stack_base()) {
498 thread->set_reserved_stack_activation(thread->stack_base());
499 }
500 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
501 return SharedRuntime::deopt_blob()->unpack_with_exception();
502 } else {
503 return nm->exception_begin();
504 }
505 }
506
507 // Entry code
508 if (StubRoutines::returns_to_call_stub(return_address)) {
509 return StubRoutines::catch_exception_entry();
510 }
511 // Interpreted code
512 if (Interpreter::contains(return_address)) {
513 return Interpreter::rethrow_exception_entry();
514 }
515
516 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
517 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
518
519 #ifndef PRODUCT
520 { ResourceMark rm;
521 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
522 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
523 tty->print_cr("b) other problem");
524 }
525 #endif // PRODUCT
526
527 ShouldNotReachHere();
528 return NULL;
529 }
530
531
532 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
533 return raw_exception_handler_for_return_address(thread, return_address);
534 JRT_END
535
536
537 address SharedRuntime::get_poll_stub(address pc) {
538 address stub;
539 // Look up the code blob
540 CodeBlob *cb = CodeCache::find_blob(pc);
541
542 // Should be an nmethod
543 assert(cb && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod");
544
545 // Look up the relocation information
546 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc),
547 "safepoint polling: type must be poll");
548
549 #ifdef ASSERT
550 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
551 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
552 Disassembler::decode(cb);
553 fatal("Only polling locations are used for safepoint");
554 }
555 #endif
556
557 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc);
558 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors();
559 if (at_poll_return) {
560 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
561 "polling page return stub not created yet");
562 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
563 } else if (has_wide_vectors) {
564 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
565 "polling page vectors safepoint stub not created yet");
566 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
567 } else {
568 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
569 "polling page safepoint stub not created yet");
570 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
571 }
572 log_debug(safepoint)("... found polling page %s exception at pc = "
573 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
574 at_poll_return ? "return" : "loop",
575 (intptr_t)pc, (intptr_t)stub);
576 return stub;
577 }
578
579
580 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
581 assert(caller.is_interpreted_frame(), "");
582 int args_size = ArgumentSizeComputer(sig).size() + 1;
583 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
584 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
585 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
586 return result;
587 }
588
589
590 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
591 if (JvmtiExport::can_post_on_exceptions()) {
592 vframeStream vfst(thread, true);
593 methodHandle method = methodHandle(thread, vfst.method());
594 address bcp = method()->bcp_from(vfst.bci());
595 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
596 }
597 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
598 }
599
600 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
601 Handle h_exception = Exceptions::new_exception(thread, name, message);
602 throw_and_post_jvmti_exception(thread, h_exception);
603 }
604
605 // The interpreter code to call this tracing function is only
606 // called/generated when UL is on for redefine, class and has the right level
607 // and tags. Since obsolete methods are never compiled, we don't have
608 // to modify the compilers to generate calls to this function.
609 //
610 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
611 JavaThread* thread, Method* method))
612 if (method->is_obsolete()) {
613 // We are calling an obsolete method, but this is not necessarily
614 // an error. Our method could have been redefined just after we
615 // fetched the Method* from the constant pool.
616 ResourceMark rm;
617 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
618 }
619 return 0;
620 JRT_END
621
622 // ret_pc points into caller; we are returning caller's exception handler
623 // for given exception
624 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception,
625 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
626 assert(cm != NULL, "must exist");
627 ResourceMark rm;
628
629 #if INCLUDE_JVMCI
630 if (cm->is_compiled_by_jvmci()) {
631 // lookup exception handler for this pc
632 int catch_pco = ret_pc - cm->code_begin();
633 ExceptionHandlerTable table(cm);
634 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
635 if (t != NULL) {
636 return cm->code_begin() + t->pco();
637 } else {
638 // there is no exception handler for this pc => deoptimize
639 cm->make_not_entrant();
640
641 // Use Deoptimization::deoptimize for all of its side-effects:
642 // revoking biases of monitors, gathering traps statistics, logging...
643 // it also patches the return pc but we do not care about that
644 // since we return a continuation to the deopt_blob below.
645 JavaThread* thread = JavaThread::current();
646 RegisterMap reg_map(thread, UseBiasedLocking);
647 frame runtime_frame = thread->last_frame();
648 frame caller_frame = runtime_frame.sender(®_map);
649 Deoptimization::deoptimize(thread, caller_frame, ®_map, Deoptimization::Reason_not_compiled_exception_handler);
650
651 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
652 }
653 }
654 #endif // INCLUDE_JVMCI
655
656 nmethod* nm = cm->as_nmethod();
657 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
658 // determine handler bci, if any
659 EXCEPTION_MARK;
660
661 int handler_bci = -1;
662 int scope_depth = 0;
663 if (!force_unwind) {
664 int bci = sd->bci();
665 bool recursive_exception = false;
666 do {
667 bool skip_scope_increment = false;
668 // exception handler lookup
669 KlassHandle ek (THREAD, exception->klass());
670 methodHandle mh(THREAD, sd->method());
671 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
672 if (HAS_PENDING_EXCEPTION) {
673 recursive_exception = true;
674 // We threw an exception while trying to find the exception handler.
675 // Transfer the new exception to the exception handle which will
676 // be set into thread local storage, and do another lookup for an
677 // exception handler for this exception, this time starting at the
678 // BCI of the exception handler which caused the exception to be
679 // thrown (bugs 4307310 and 4546590). Set "exception" reference
680 // argument to ensure that the correct exception is thrown (4870175).
681 recursive_exception_occurred = true;
682 exception = Handle(THREAD, PENDING_EXCEPTION);
683 CLEAR_PENDING_EXCEPTION;
684 if (handler_bci >= 0) {
685 bci = handler_bci;
686 handler_bci = -1;
687 skip_scope_increment = true;
688 }
689 }
690 else {
691 recursive_exception = false;
692 }
693 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
694 sd = sd->sender();
695 if (sd != NULL) {
696 bci = sd->bci();
697 }
698 ++scope_depth;
699 }
700 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
701 }
702
703 // found handling method => lookup exception handler
704 int catch_pco = ret_pc - nm->code_begin();
705
706 ExceptionHandlerTable table(nm);
707 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
708 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
709 // Allow abbreviated catch tables. The idea is to allow a method
710 // to materialize its exceptions without committing to the exact
711 // routing of exceptions. In particular this is needed for adding
712 // a synthetic handler to unlock monitors when inlining
713 // synchronized methods since the unlock path isn't represented in
714 // the bytecodes.
715 t = table.entry_for(catch_pco, -1, 0);
716 }
717
718 #ifdef COMPILER1
719 if (t == NULL && nm->is_compiled_by_c1()) {
720 assert(nm->unwind_handler_begin() != NULL, "");
721 return nm->unwind_handler_begin();
722 }
723 #endif
724
725 if (t == NULL) {
726 ttyLocker ttyl;
727 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci);
728 tty->print_cr(" Exception:");
729 exception->print();
730 tty->cr();
731 tty->print_cr(" Compiled exception table :");
732 table.print();
733 nm->print_code();
734 guarantee(false, "missing exception handler");
735 return NULL;
736 }
737
738 return nm->code_begin() + t->pco();
739 }
740
741 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
742 // These errors occur only at call sites
743 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
744 JRT_END
745
746 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
747 // These errors occur only at call sites
748 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
749 JRT_END
750
751 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
752 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
753 JRT_END
754
755 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
756 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
757 JRT_END
758
759 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
760 // This entry point is effectively only used for NullPointerExceptions which occur at inline
761 // cache sites (when the callee activation is not yet set up) so we are at a call site
762 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
763 JRT_END
764
765 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
766 throw_StackOverflowError_common(thread, false);
767 JRT_END
768
769 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
770 throw_StackOverflowError_common(thread, true);
771 JRT_END
772
773 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) {
774 // We avoid using the normal exception construction in this case because
775 // it performs an upcall to Java, and we're already out of stack space.
776 Thread* THREAD = thread;
777 Klass* k = SystemDictionary::StackOverflowError_klass();
778 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
779 if (delayed) {
780 java_lang_Throwable::set_message(exception_oop,
781 Universe::delayed_stack_overflow_error_message());
782 }
783 Handle exception (thread, exception_oop);
784 if (StackTraceInThrowable) {
785 java_lang_Throwable::fill_in_stack_trace(exception);
786 }
787 // Increment counter for hs_err file reporting
788 Atomic::inc(&Exceptions::_stack_overflow_errors);
789 throw_and_post_jvmti_exception(thread, exception);
790 }
791
792 #if INCLUDE_JVMCI
793 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason) {
794 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason");
795 thread->set_jvmci_implicit_exception_pc(pc);
796 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret));
797 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
798 }
799 #endif // INCLUDE_JVMCI
800
801 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
802 address pc,
803 SharedRuntime::ImplicitExceptionKind exception_kind)
804 {
805 address target_pc = NULL;
806
807 if (Interpreter::contains(pc)) {
808 #ifdef CC_INTERP
809 // C++ interpreter doesn't throw implicit exceptions
810 ShouldNotReachHere();
811 #else
812 switch (exception_kind) {
813 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
814 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
815 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
816 default: ShouldNotReachHere();
817 }
818 #endif // !CC_INTERP
819 } else {
820 switch (exception_kind) {
821 case STACK_OVERFLOW: {
822 // Stack overflow only occurs upon frame setup; the callee is
823 // going to be unwound. Dispatch to a shared runtime stub
824 // which will cause the StackOverflowError to be fabricated
825 // and processed.
826 // Stack overflow should never occur during deoptimization:
827 // the compiled method bangs the stack by as much as the
828 // interpreter would need in case of a deoptimization. The
829 // deoptimization blob and uncommon trap blob bang the stack
830 // in a debug VM to verify the correctness of the compiled
831 // method stack banging.
832 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
833 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
834 return StubRoutines::throw_StackOverflowError_entry();
835 }
836
837 case IMPLICIT_NULL: {
838 if (VtableStubs::contains(pc)) {
839 // We haven't yet entered the callee frame. Fabricate an
840 // exception and begin dispatching it in the caller. Since
841 // the caller was at a call site, it's safe to destroy all
842 // caller-saved registers, as these entry points do.
843 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
844
845 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
846 if (vt_stub == NULL) return NULL;
847
848 if (vt_stub->is_abstract_method_error(pc)) {
849 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
850 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
851 return StubRoutines::throw_AbstractMethodError_entry();
852 } else {
853 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
854 return StubRoutines::throw_NullPointerException_at_call_entry();
855 }
856 } else {
857 CodeBlob* cb = CodeCache::find_blob(pc);
858
859 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
860 if (cb == NULL) return NULL;
861
862 // Exception happened in CodeCache. Must be either:
863 // 1. Inline-cache check in C2I handler blob,
864 // 2. Inline-cache check in nmethod, or
865 // 3. Implicit null exception in nmethod
866
867 if (!cb->is_compiled()) {
868 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
869 if (!is_in_blob) {
870 // Allow normal crash reporting to handle this
871 return NULL;
872 }
873 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
874 // There is no handler here, so we will simply unwind.
875 return StubRoutines::throw_NullPointerException_at_call_entry();
876 }
877
878 // Otherwise, it's a compiled method. Consult its exception handlers.
879 CompiledMethod* cm = (CompiledMethod*)cb;
880 if (cm->inlinecache_check_contains(pc)) {
881 // exception happened inside inline-cache check code
882 // => the nmethod is not yet active (i.e., the frame
883 // is not set up yet) => use return address pushed by
884 // caller => don't push another return address
885 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
886 return StubRoutines::throw_NullPointerException_at_call_entry();
887 }
888
889 if (cm->method()->is_method_handle_intrinsic()) {
890 // exception happened inside MH dispatch code, similar to a vtable stub
891 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
892 return StubRoutines::throw_NullPointerException_at_call_entry();
893 }
894
895 #ifndef PRODUCT
896 _implicit_null_throws++;
897 #endif
898 #if INCLUDE_JVMCI
899 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) {
900 // If there's no PcDesc then we'll die way down inside of
901 // deopt instead of just getting normal error reporting,
902 // so only go there if it will succeed.
903 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_null_check);
904 } else {
905 #endif // INCLUDE_JVMCI
906 assert (cm->is_nmethod(), "Expect nmethod");
907 target_pc = ((nmethod*)cm)->continuation_for_implicit_exception(pc);
908 #if INCLUDE_JVMCI
909 }
910 #endif // INCLUDE_JVMCI
911 // If there's an unexpected fault, target_pc might be NULL,
912 // in which case we want to fall through into the normal
913 // error handling code.
914 }
915
916 break; // fall through
917 }
918
919
920 case IMPLICIT_DIVIDE_BY_ZERO: {
921 CompiledMethod* cm = CodeCache::find_compiled(pc);
922 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions");
923 #ifndef PRODUCT
924 _implicit_div0_throws++;
925 #endif
926 #if INCLUDE_JVMCI
927 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) {
928 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_div0_check);
929 } else {
930 #endif // INCLUDE_JVMCI
931 target_pc = cm->continuation_for_implicit_exception(pc);
932 #if INCLUDE_JVMCI
933 }
934 #endif // INCLUDE_JVMCI
935 // If there's an unexpected fault, target_pc might be NULL,
936 // in which case we want to fall through into the normal
937 // error handling code.
938 break; // fall through
939 }
940
941 default: ShouldNotReachHere();
942 }
943
944 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
945
946 if (exception_kind == IMPLICIT_NULL) {
947 #ifndef PRODUCT
948 // for AbortVMOnException flag
949 Exceptions::debug_check_abort("java.lang.NullPointerException");
950 #endif //PRODUCT
951 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
952 } else {
953 #ifndef PRODUCT
954 // for AbortVMOnException flag
955 Exceptions::debug_check_abort("java.lang.ArithmeticException");
956 #endif //PRODUCT
957 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
958 }
959 return target_pc;
960 }
961
962 ShouldNotReachHere();
963 return NULL;
964 }
965
966
967 /**
968 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
969 * installed in the native function entry of all native Java methods before
970 * they get linked to their actual native methods.
971 *
972 * \note
973 * This method actually never gets called! The reason is because
974 * the interpreter's native entries call NativeLookup::lookup() which
975 * throws the exception when the lookup fails. The exception is then
976 * caught and forwarded on the return from NativeLookup::lookup() call
977 * before the call to the native function. This might change in the future.
978 */
979 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
980 {
981 // We return a bad value here to make sure that the exception is
982 // forwarded before we look at the return value.
983 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
984 }
985 JNI_END
986
987 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
988 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
989 }
990
991 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
992 assert(obj->is_oop(), "must be a valid oop");
993 #if INCLUDE_JVMCI
994 // This removes the requirement for JVMCI compilers to emit code
995 // performing a dynamic check that obj has a finalizer before
996 // calling this routine. There should be no performance impact
997 // for C1 since it emits a dynamic check. C2 and the interpreter
998 // uses other runtime routines for registering finalizers.
999 if (!obj->klass()->has_finalizer()) {
1000 return;
1001 }
1002 #endif // INCLUDE_JVMCI
1003 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1004 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1005 JRT_END
1006
1007
1008 jlong SharedRuntime::get_java_tid(Thread* thread) {
1009 if (thread != NULL) {
1010 if (thread->is_Java_thread()) {
1011 oop obj = ((JavaThread*)thread)->threadObj();
1012 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
1013 }
1014 }
1015 return 0;
1016 }
1017
1018 /**
1019 * This function ought to be a void function, but cannot be because
1020 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1021 * 6254741. Once that is fixed we can remove the dummy return value.
1022 */
1023 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
1024 return dtrace_object_alloc_base(Thread::current(), o, size);
1025 }
1026
1027 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
1028 assert(DTraceAllocProbes, "wrong call");
1029 Klass* klass = o->klass();
1030 Symbol* name = klass->name();
1031 HOTSPOT_OBJECT_ALLOC(
1032 get_java_tid(thread),
1033 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1034 return 0;
1035 }
1036
1037 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1038 JavaThread* thread, Method* method))
1039 assert(DTraceMethodProbes, "wrong call");
1040 Symbol* kname = method->klass_name();
1041 Symbol* name = method->name();
1042 Symbol* sig = method->signature();
1043 HOTSPOT_METHOD_ENTRY(
1044 get_java_tid(thread),
1045 (char *) kname->bytes(), kname->utf8_length(),
1046 (char *) name->bytes(), name->utf8_length(),
1047 (char *) sig->bytes(), sig->utf8_length());
1048 return 0;
1049 JRT_END
1050
1051 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1052 JavaThread* thread, Method* method))
1053 assert(DTraceMethodProbes, "wrong call");
1054 Symbol* kname = method->klass_name();
1055 Symbol* name = method->name();
1056 Symbol* sig = method->signature();
1057 HOTSPOT_METHOD_RETURN(
1058 get_java_tid(thread),
1059 (char *) kname->bytes(), kname->utf8_length(),
1060 (char *) name->bytes(), name->utf8_length(),
1061 (char *) sig->bytes(), sig->utf8_length());
1062 return 0;
1063 JRT_END
1064
1065
1066 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1067 // for a call current in progress, i.e., arguments has been pushed on stack
1068 // put callee has not been invoked yet. Used by: resolve virtual/static,
1069 // vtable updates, etc. Caller frame must be compiled.
1070 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1071 ResourceMark rm(THREAD);
1072
1073 // last java frame on stack (which includes native call frames)
1074 vframeStream vfst(thread, true); // Do not skip and javaCalls
1075
1076 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD);
1077 }
1078
1079 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) {
1080 CompiledMethod* caller = vfst.nm();
1081
1082 nmethodLocker caller_lock(caller);
1083
1084 address pc = vfst.frame_pc();
1085 { // Get call instruction under lock because another thread may be busy patching it.
1086 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1087 return caller->attached_method_before_pc(pc);
1088 }
1089 return NULL;
1090 }
1091
1092 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1093 // for a call current in progress, i.e., arguments has been pushed on stack
1094 // but callee has not been invoked yet. Caller frame must be compiled.
1095 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1096 vframeStream& vfst,
1097 Bytecodes::Code& bc,
1098 CallInfo& callinfo, TRAPS) {
1099 Handle receiver;
1100 Handle nullHandle; //create a handy null handle for exception returns
1101
1102 assert(!vfst.at_end(), "Java frame must exist");
1103
1104 // Find caller and bci from vframe
1105 methodHandle caller(THREAD, vfst.method());
1106 int bci = vfst.bci();
1107
1108 Bytecode_invoke bytecode(caller, bci);
1109 int bytecode_index = bytecode.index();
1110
1111 methodHandle attached_method = extract_attached_method(vfst);
1112 if (attached_method.not_null()) {
1113 methodHandle callee = bytecode.static_target(CHECK_NH);
1114 vmIntrinsics::ID id = callee->intrinsic_id();
1115 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1116 // it attaches statically resolved method to the call site.
1117 if (MethodHandles::is_signature_polymorphic(id) &&
1118 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1119 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1120
1121 // Adjust invocation mode according to the attached method.
1122 switch (bc) {
1123 case Bytecodes::_invokeinterface:
1124 if (!attached_method->method_holder()->is_interface()) {
1125 bc = Bytecodes::_invokevirtual;
1126 }
1127 break;
1128 case Bytecodes::_invokehandle:
1129 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1130 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1131 : Bytecodes::_invokevirtual;
1132 }
1133 break;
1134 }
1135 }
1136 } else {
1137 bc = bytecode.invoke_code();
1138 }
1139
1140 bool has_receiver = bc != Bytecodes::_invokestatic &&
1141 bc != Bytecodes::_invokedynamic &&
1142 bc != Bytecodes::_invokehandle;
1143
1144 // Find receiver for non-static call
1145 if (has_receiver) {
1146 // This register map must be update since we need to find the receiver for
1147 // compiled frames. The receiver might be in a register.
1148 RegisterMap reg_map2(thread);
1149 frame stubFrame = thread->last_frame();
1150 // Caller-frame is a compiled frame
1151 frame callerFrame = stubFrame.sender(®_map2);
1152
1153 if (attached_method.is_null()) {
1154 methodHandle callee = bytecode.static_target(CHECK_NH);
1155 if (callee.is_null()) {
1156 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1157 }
1158 }
1159
1160 // Retrieve from a compiled argument list
1161 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1162
1163 if (receiver.is_null()) {
1164 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1165 }
1166 }
1167
1168 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1169
1170 // Resolve method
1171 if (attached_method.not_null()) {
1172 // Parameterized by attached method.
1173 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1174 } else {
1175 // Parameterized by bytecode.
1176 constantPoolHandle constants(THREAD, caller->constants());
1177 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1178 }
1179
1180 #ifdef ASSERT
1181 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1182 if (has_receiver) {
1183 assert(receiver.not_null(), "should have thrown exception");
1184 KlassHandle receiver_klass(THREAD, receiver->klass());
1185 Klass* rk = NULL;
1186 if (attached_method.not_null()) {
1187 // In case there's resolved method attached, use its holder during the check.
1188 rk = attached_method->method_holder();
1189 } else {
1190 // Klass is already loaded.
1191 constantPoolHandle constants(THREAD, caller->constants());
1192 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1193 }
1194 KlassHandle static_receiver_klass(THREAD, rk);
1195 methodHandle callee = callinfo.selected_method();
1196 assert(receiver_klass->is_subtype_of(static_receiver_klass()),
1197 "actual receiver must be subclass of static receiver klass");
1198 if (receiver_klass->is_instance_klass()) {
1199 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1200 tty->print_cr("ERROR: Klass not yet initialized!!");
1201 receiver_klass()->print();
1202 }
1203 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1204 }
1205 }
1206 #endif
1207
1208 return receiver;
1209 }
1210
1211 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1212 ResourceMark rm(THREAD);
1213 // We need first to check if any Java activations (compiled, interpreted)
1214 // exist on the stack since last JavaCall. If not, we need
1215 // to get the target method from the JavaCall wrapper.
1216 vframeStream vfst(thread, true); // Do not skip any javaCalls
1217 methodHandle callee_method;
1218 if (vfst.at_end()) {
1219 // No Java frames were found on stack since we did the JavaCall.
1220 // Hence the stack can only contain an entry_frame. We need to
1221 // find the target method from the stub frame.
1222 RegisterMap reg_map(thread, false);
1223 frame fr = thread->last_frame();
1224 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1225 fr = fr.sender(®_map);
1226 assert(fr.is_entry_frame(), "must be");
1227 // fr is now pointing to the entry frame.
1228 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1229 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1230 } else {
1231 Bytecodes::Code bc;
1232 CallInfo callinfo;
1233 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1234 callee_method = callinfo.selected_method();
1235 }
1236 assert(callee_method()->is_method(), "must be");
1237 return callee_method;
1238 }
1239
1240 // Resolves a call.
1241 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1242 bool is_virtual,
1243 bool is_optimized, TRAPS) {
1244 methodHandle callee_method;
1245 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1246 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1247 int retry_count = 0;
1248 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1249 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1250 // If has a pending exception then there is no need to re-try to
1251 // resolve this method.
1252 // If the method has been redefined, we need to try again.
1253 // Hack: we have no way to update the vtables of arrays, so don't
1254 // require that java.lang.Object has been updated.
1255
1256 // It is very unlikely that method is redefined more than 100 times
1257 // in the middle of resolve. If it is looping here more than 100 times
1258 // means then there could be a bug here.
1259 guarantee((retry_count++ < 100),
1260 "Could not resolve to latest version of redefined method");
1261 // method is redefined in the middle of resolve so re-try.
1262 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1263 }
1264 }
1265 return callee_method;
1266 }
1267
1268 // Resolves a call. The compilers generate code for calls that go here
1269 // and are patched with the real destination of the call.
1270 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1271 bool is_virtual,
1272 bool is_optimized, TRAPS) {
1273
1274 ResourceMark rm(thread);
1275 RegisterMap cbl_map(thread, false);
1276 frame caller_frame = thread->last_frame().sender(&cbl_map);
1277
1278 CodeBlob* caller_cb = caller_frame.cb();
1279 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1280 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1281
1282 // make sure caller is not getting deoptimized
1283 // and removed before we are done with it.
1284 // CLEANUP - with lazy deopt shouldn't need this lock
1285 nmethodLocker caller_lock(caller_nm);
1286
1287 // determine call info & receiver
1288 // note: a) receiver is NULL for static calls
1289 // b) an exception is thrown if receiver is NULL for non-static calls
1290 CallInfo call_info;
1291 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1292 Handle receiver = find_callee_info(thread, invoke_code,
1293 call_info, CHECK_(methodHandle()));
1294 methodHandle callee_method = call_info.selected_method();
1295
1296 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1297 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1298 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1299 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1300 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1301
1302 assert(caller_nm->is_alive(), "It should be alive");
1303
1304 #ifndef PRODUCT
1305 // tracing/debugging/statistics
1306 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1307 (is_virtual) ? (&_resolve_virtual_ctr) :
1308 (&_resolve_static_ctr);
1309 Atomic::inc(addr);
1310
1311 if (TraceCallFixup) {
1312 ResourceMark rm(thread);
1313 tty->print("resolving %s%s (%s) call to",
1314 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1315 Bytecodes::name(invoke_code));
1316 callee_method->print_short_name(tty);
1317 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1318 p2i(caller_frame.pc()), p2i(callee_method->code()));
1319 }
1320 #endif
1321
1322 // JSR 292 key invariant:
1323 // If the resolved method is a MethodHandle invoke target, the call
1324 // site must be a MethodHandle call site, because the lambda form might tail-call
1325 // leaving the stack in a state unknown to either caller or callee
1326 // TODO detune for now but we might need it again
1327 // assert(!callee_method->is_compiled_lambda_form() ||
1328 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1329
1330 // Compute entry points. This might require generation of C2I converter
1331 // frames, so we cannot be holding any locks here. Furthermore, the
1332 // computation of the entry points is independent of patching the call. We
1333 // always return the entry-point, but we only patch the stub if the call has
1334 // not been deoptimized. Return values: For a virtual call this is an
1335 // (cached_oop, destination address) pair. For a static call/optimized
1336 // virtual this is just a destination address.
1337
1338 StaticCallInfo static_call_info;
1339 CompiledICInfo virtual_call_info;
1340
1341 // Make sure the callee nmethod does not get deoptimized and removed before
1342 // we are done patching the code.
1343 CompiledMethod* callee = callee_method->code();
1344
1345 if (callee != NULL) {
1346 assert(callee->is_compiled(), "must be nmethod for patching");
1347 }
1348
1349 if (callee != NULL && !callee->is_in_use()) {
1350 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1351 callee = NULL;
1352 }
1353 nmethodLocker nl_callee(callee);
1354 #ifdef ASSERT
1355 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1356 #endif
1357
1358 if (is_virtual) {
1359 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1360 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1361 KlassHandle h_klass(THREAD, invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass());
1362 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1363 is_optimized, static_bound, virtual_call_info,
1364 CHECK_(methodHandle()));
1365 } else {
1366 // static call
1367 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1368 }
1369
1370 // grab lock, check for deoptimization and potentially patch caller
1371 {
1372 MutexLocker ml_patch(CompiledIC_lock);
1373
1374 // Lock blocks for safepoint during which both nmethods can change state.
1375
1376 // Now that we are ready to patch if the Method* was redefined then
1377 // don't update call site and let the caller retry.
1378 // Don't update call site if callee nmethod was unloaded or deoptimized.
1379 // Don't update call site if callee nmethod was replaced by an other nmethod
1380 // which may happen when multiply alive nmethod (tiered compilation)
1381 // will be supported.
1382 if (!callee_method->is_old() &&
1383 (callee == NULL || callee->is_in_use() && (callee_method->code() == callee))) {
1384 #ifdef ASSERT
1385 // We must not try to patch to jump to an already unloaded method.
1386 if (dest_entry_point != 0) {
1387 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1388 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee),
1389 "should not call unloaded nmethod");
1390 }
1391 #endif
1392 if (is_virtual) {
1393 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1394 if (inline_cache->is_clean()) {
1395 inline_cache->set_to_monomorphic(virtual_call_info);
1396 }
1397 } else {
1398 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1399 if (ssc->is_clean()) ssc->set(static_call_info);
1400 }
1401 }
1402
1403 } // unlock CompiledIC_lock
1404
1405 return callee_method;
1406 }
1407
1408
1409 // Inline caches exist only in compiled code
1410 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1411 #ifdef ASSERT
1412 RegisterMap reg_map(thread, false);
1413 frame stub_frame = thread->last_frame();
1414 assert(stub_frame.is_runtime_frame(), "sanity check");
1415 frame caller_frame = stub_frame.sender(®_map);
1416 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1417 #endif /* ASSERT */
1418
1419 methodHandle callee_method;
1420 JRT_BLOCK
1421 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1422 // Return Method* through TLS
1423 thread->set_vm_result_2(callee_method());
1424 JRT_BLOCK_END
1425 // return compiled code entry point after potential safepoints
1426 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1427 return callee_method->verified_code_entry();
1428 JRT_END
1429
1430
1431 // Handle call site that has been made non-entrant
1432 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1433 // 6243940 We might end up in here if the callee is deoptimized
1434 // as we race to call it. We don't want to take a safepoint if
1435 // the caller was interpreted because the caller frame will look
1436 // interpreted to the stack walkers and arguments are now
1437 // "compiled" so it is much better to make this transition
1438 // invisible to the stack walking code. The i2c path will
1439 // place the callee method in the callee_target. It is stashed
1440 // there because if we try and find the callee by normal means a
1441 // safepoint is possible and have trouble gc'ing the compiled args.
1442 RegisterMap reg_map(thread, false);
1443 frame stub_frame = thread->last_frame();
1444 assert(stub_frame.is_runtime_frame(), "sanity check");
1445 frame caller_frame = stub_frame.sender(®_map);
1446
1447 if (caller_frame.is_interpreted_frame() ||
1448 caller_frame.is_entry_frame()) {
1449 Method* callee = thread->callee_target();
1450 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1451 thread->set_vm_result_2(callee);
1452 thread->set_callee_target(NULL);
1453 return callee->get_c2i_entry();
1454 }
1455
1456 // Must be compiled to compiled path which is safe to stackwalk
1457 methodHandle callee_method;
1458 JRT_BLOCK
1459 // Force resolving of caller (if we called from compiled frame)
1460 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1461 thread->set_vm_result_2(callee_method());
1462 JRT_BLOCK_END
1463 // return compiled code entry point after potential safepoints
1464 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1465 return callee_method->verified_code_entry();
1466 JRT_END
1467
1468 // Handle abstract method call
1469 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1470 return StubRoutines::throw_AbstractMethodError_entry();
1471 JRT_END
1472
1473
1474 // resolve a static call and patch code
1475 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1476 methodHandle callee_method;
1477 JRT_BLOCK
1478 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1479 thread->set_vm_result_2(callee_method());
1480 JRT_BLOCK_END
1481 // return compiled code entry point after potential safepoints
1482 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1483 return callee_method->verified_code_entry();
1484 JRT_END
1485
1486
1487 // resolve virtual call and update inline cache to monomorphic
1488 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1489 methodHandle callee_method;
1490 JRT_BLOCK
1491 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1492 thread->set_vm_result_2(callee_method());
1493 JRT_BLOCK_END
1494 // return compiled code entry point after potential safepoints
1495 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1496 return callee_method->verified_code_entry();
1497 JRT_END
1498
1499
1500 // Resolve a virtual call that can be statically bound (e.g., always
1501 // monomorphic, so it has no inline cache). Patch code to resolved target.
1502 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1503 methodHandle callee_method;
1504 JRT_BLOCK
1505 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1506 thread->set_vm_result_2(callee_method());
1507 JRT_BLOCK_END
1508 // return compiled code entry point after potential safepoints
1509 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1510 return callee_method->verified_code_entry();
1511 JRT_END
1512
1513
1514 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1515 ResourceMark rm(thread);
1516 CallInfo call_info;
1517 Bytecodes::Code bc;
1518
1519 // receiver is NULL for static calls. An exception is thrown for NULL
1520 // receivers for non-static calls
1521 Handle receiver = find_callee_info(thread, bc, call_info,
1522 CHECK_(methodHandle()));
1523 // Compiler1 can produce virtual call sites that can actually be statically bound
1524 // If we fell thru to below we would think that the site was going megamorphic
1525 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1526 // we'd try and do a vtable dispatch however methods that can be statically bound
1527 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1528 // reresolution of the call site (as if we did a handle_wrong_method and not an
1529 // plain ic_miss) and the site will be converted to an optimized virtual call site
1530 // never to miss again. I don't believe C2 will produce code like this but if it
1531 // did this would still be the correct thing to do for it too, hence no ifdef.
1532 //
1533 if (call_info.resolved_method()->can_be_statically_bound()) {
1534 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1535 if (TraceCallFixup) {
1536 RegisterMap reg_map(thread, false);
1537 frame caller_frame = thread->last_frame().sender(®_map);
1538 ResourceMark rm(thread);
1539 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1540 callee_method->print_short_name(tty);
1541 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1542 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1543 }
1544 return callee_method;
1545 }
1546
1547 methodHandle callee_method = call_info.selected_method();
1548
1549 bool should_be_mono = false;
1550
1551 #ifndef PRODUCT
1552 Atomic::inc(&_ic_miss_ctr);
1553
1554 // Statistics & Tracing
1555 if (TraceCallFixup) {
1556 ResourceMark rm(thread);
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(thread, false);
1565 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1566 // produce statistics under the lock
1567 trace_ic_miss(f.pc());
1568 }
1569 #endif
1570
1571 // install an event collector so that when a vtable stub is created the
1572 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1573 // event can't be posted when the stub is created as locks are held
1574 // - instead the event will be deferred until the event collector goes
1575 // out of scope.
1576 JvmtiDynamicCodeEventCollector event_collector;
1577
1578 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1579 { MutexLocker ml_patch (CompiledIC_lock);
1580 RegisterMap reg_map(thread, false);
1581 frame caller_frame = thread->last_frame().sender(®_map);
1582 CodeBlob* cb = caller_frame.cb();
1583 CompiledMethod* caller_nm = cb->as_compiled_method_or_null();
1584 if (cb->is_compiled()) {
1585 CompiledIC* inline_cache = CompiledIC_before(((CompiledMethod*)cb), caller_frame.pc());
1586 bool should_be_mono = false;
1587 if (inline_cache->is_optimized()) {
1588 if (TraceCallFixup) {
1589 ResourceMark rm(thread);
1590 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1591 callee_method->print_short_name(tty);
1592 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1593 }
1594 should_be_mono = true;
1595 } else if (inline_cache->is_icholder_call()) {
1596 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1597 if (ic_oop != NULL) {
1598
1599 if (receiver()->klass() == ic_oop->holder_klass()) {
1600 // This isn't a real miss. We must have seen that compiled code
1601 // is now available and we want the call site converted to a
1602 // monomorphic compiled call site.
1603 // We can't assert for callee_method->code() != NULL because it
1604 // could have been deoptimized in the meantime
1605 if (TraceCallFixup) {
1606 ResourceMark rm(thread);
1607 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1608 callee_method->print_short_name(tty);
1609 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1610 }
1611 should_be_mono = true;
1612 }
1613 }
1614 }
1615
1616 if (should_be_mono) {
1617
1618 // We have a path that was monomorphic but was going interpreted
1619 // and now we have (or had) a compiled entry. We correct the IC
1620 // by using a new icBuffer.
1621 CompiledICInfo info;
1622 KlassHandle receiver_klass(THREAD, receiver()->klass());
1623 inline_cache->compute_monomorphic_entry(callee_method,
1624 receiver_klass,
1625 inline_cache->is_optimized(),
1626 false,
1627 info, CHECK_(methodHandle()));
1628 inline_cache->set_to_monomorphic(info);
1629 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1630 // Potential change to megamorphic
1631 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1632 if (!successful) {
1633 inline_cache->set_to_clean();
1634 }
1635 } else {
1636 // Either clean or megamorphic
1637 }
1638 } else {
1639 fatal("Unimplemented");
1640 }
1641 } // Release CompiledIC_lock
1642
1643 return callee_method;
1644 }
1645
1646 //
1647 // Resets a call-site in compiled code so it will get resolved again.
1648 // This routines handles both virtual call sites, optimized virtual call
1649 // sites, and static call sites. Typically used to change a call sites
1650 // destination from compiled to interpreted.
1651 //
1652 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1653 ResourceMark rm(thread);
1654 RegisterMap reg_map(thread, false);
1655 frame stub_frame = thread->last_frame();
1656 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1657 frame caller = stub_frame.sender(®_map);
1658
1659 // Do nothing if the frame isn't a live compiled frame.
1660 // nmethod could be deoptimized by the time we get here
1661 // so no update to the caller is needed.
1662
1663 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1664
1665 address pc = caller.pc();
1666
1667 // Check for static or virtual call
1668 bool is_static_call = false;
1669 CompiledMethod* caller_nm = CodeCache::find_compiled(pc);
1670
1671 // Default call_addr is the location of the "basic" call.
1672 // Determine the address of the call we a reresolving. With
1673 // Inline Caches we will always find a recognizable call.
1674 // With Inline Caches disabled we may or may not find a
1675 // recognizable call. We will always find a call for static
1676 // calls and for optimized virtual calls. For vanilla virtual
1677 // calls it depends on the state of the UseInlineCaches switch.
1678 //
1679 // With Inline Caches disabled we can get here for a virtual call
1680 // for two reasons:
1681 // 1 - calling an abstract method. The vtable for abstract methods
1682 // will run us thru handle_wrong_method and we will eventually
1683 // end up in the interpreter to throw the ame.
1684 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1685 // call and between the time we fetch the entry address and
1686 // we jump to it the target gets deoptimized. Similar to 1
1687 // we will wind up in the interprter (thru a c2i with c2).
1688 //
1689 address call_addr = NULL;
1690 {
1691 // Get call instruction under lock because another thread may be
1692 // busy patching it.
1693 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1694 // Location of call instruction
1695 if (NativeCall::is_call_before(pc)) {
1696 NativeCall *ncall = nativeCall_before(pc);
1697 call_addr = ncall->instruction_address();
1698 }
1699 }
1700 // Make sure nmethod doesn't get deoptimized and removed until
1701 // this is done with it.
1702 // CLEANUP - with lazy deopt shouldn't need this lock
1703 nmethodLocker nmlock(caller_nm);
1704
1705 if (call_addr != NULL) {
1706 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1707 int ret = iter.next(); // Get item
1708 if (ret) {
1709 assert(iter.addr() == call_addr, "must find call");
1710 if (iter.type() == relocInfo::static_call_type) {
1711 is_static_call = true;
1712 } else {
1713 assert(iter.type() == relocInfo::virtual_call_type ||
1714 iter.type() == relocInfo::opt_virtual_call_type
1715 , "unexpected relocInfo. type");
1716 }
1717 } else {
1718 assert(!UseInlineCaches, "relocation info. must exist for this address");
1719 }
1720
1721 // Cleaning the inline cache will force a new resolve. This is more robust
1722 // than directly setting it to the new destination, since resolving of calls
1723 // is always done through the same code path. (experience shows that it
1724 // leads to very hard to track down bugs, if an inline cache gets updated
1725 // to a wrong method). It should not be performance critical, since the
1726 // resolve is only done once.
1727
1728 MutexLocker ml(CompiledIC_lock);
1729 if (is_static_call) {
1730 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1731 ssc->set_to_clean();
1732 } else {
1733 // compiled, dispatched call (which used to call an interpreted method)
1734 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1735 inline_cache->set_to_clean();
1736 }
1737 }
1738 }
1739
1740 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1741
1742
1743 #ifndef PRODUCT
1744 Atomic::inc(&_wrong_method_ctr);
1745
1746 if (TraceCallFixup) {
1747 ResourceMark rm(thread);
1748 tty->print("handle_wrong_method reresolving call to");
1749 callee_method->print_short_name(tty);
1750 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1751 }
1752 #endif
1753
1754 return callee_method;
1755 }
1756
1757 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1758 // The faulting unsafe accesses should be changed to throw the error
1759 // synchronously instead. Meanwhile the faulting instruction will be
1760 // skipped over (effectively turning it into a no-op) and an
1761 // asynchronous exception will be raised which the thread will
1762 // handle at a later point. If the instruction is a load it will
1763 // return garbage.
1764
1765 // Request an async exception.
1766 thread->set_pending_unsafe_access_error();
1767
1768 // Return address of next instruction to execute.
1769 return next_pc;
1770 }
1771
1772 #ifdef ASSERT
1773 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1774 const BasicType* sig_bt,
1775 const VMRegPair* regs) {
1776 ResourceMark rm;
1777 const int total_args_passed = method->size_of_parameters();
1778 const VMRegPair* regs_with_member_name = regs;
1779 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1780
1781 const int member_arg_pos = total_args_passed - 1;
1782 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1783 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1784
1785 const bool is_outgoing = method->is_method_handle_intrinsic();
1786 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1787
1788 for (int i = 0; i < member_arg_pos; i++) {
1789 VMReg a = regs_with_member_name[i].first();
1790 VMReg b = regs_without_member_name[i].first();
1791 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value());
1792 }
1793 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1794 }
1795 #endif
1796
1797 // ---------------------------------------------------------------------------
1798 // We are calling the interpreter via a c2i. Normally this would mean that
1799 // we were called by a compiled method. However we could have lost a race
1800 // where we went int -> i2c -> c2i and so the caller could in fact be
1801 // interpreted. If the caller is compiled we attempt to patch the caller
1802 // so he no longer calls into the interpreter.
1803 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1804 Method* moop(method);
1805
1806 address entry_point = moop->from_compiled_entry_no_trampoline();
1807
1808 // It's possible that deoptimization can occur at a call site which hasn't
1809 // been resolved yet, in which case this function will be called from
1810 // an nmethod that has been patched for deopt and we can ignore the
1811 // request for a fixup.
1812 // Also it is possible that we lost a race in that from_compiled_entry
1813 // is now back to the i2c in that case we don't need to patch and if
1814 // we did we'd leap into space because the callsite needs to use
1815 // "to interpreter" stub in order to load up the Method*. Don't
1816 // ask me how I know this...
1817
1818 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1819 if (!cb->is_compiled() || entry_point == moop->get_c2i_entry()) {
1820 return;
1821 }
1822
1823 // The check above makes sure this is a nmethod.
1824 CompiledMethod* nm = cb->as_compiled_method_or_null();
1825 assert(nm, "must be");
1826
1827 // Get the return PC for the passed caller PC.
1828 address return_pc = caller_pc + frame::pc_return_offset;
1829
1830 // There is a benign race here. We could be attempting to patch to a compiled
1831 // entry point at the same time the callee is being deoptimized. If that is
1832 // the case then entry_point may in fact point to a c2i and we'd patch the
1833 // call site with the same old data. clear_code will set code() to NULL
1834 // at the end of it. If we happen to see that NULL then we can skip trying
1835 // to patch. If we hit the window where the callee has a c2i in the
1836 // from_compiled_entry and the NULL isn't present yet then we lose the race
1837 // and patch the code with the same old data. Asi es la vida.
1838
1839 if (moop->code() == NULL) return;
1840
1841 if (nm->is_in_use()) {
1842
1843 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1844 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1845 if (NativeCall::is_call_before(return_pc)) {
1846 NativeCall *call = nativeCall_before(return_pc);
1847 //
1848 // bug 6281185. We might get here after resolving a call site to a vanilla
1849 // virtual call. Because the resolvee uses the verified entry it may then
1850 // see compiled code and attempt to patch the site by calling us. This would
1851 // then incorrectly convert the call site to optimized and its downhill from
1852 // there. If you're lucky you'll get the assert in the bugid, if not you've
1853 // just made a call site that could be megamorphic into a monomorphic site
1854 // for the rest of its life! Just another racing bug in the life of
1855 // fixup_callers_callsite ...
1856 //
1857 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1858 iter.next();
1859 assert(iter.has_current(), "must have a reloc at java call site");
1860 relocInfo::relocType typ = iter.reloc()->type();
1861 if (typ != relocInfo::static_call_type &&
1862 typ != relocInfo::opt_virtual_call_type &&
1863 typ != relocInfo::static_stub_type) {
1864 return;
1865 }
1866 address destination = call->destination();
1867 if (destination != entry_point) {
1868 CodeBlob* callee = CodeCache::find_blob(destination);
1869 // callee == cb seems weird. It means calling interpreter thru stub.
1870 if (callee == cb || callee->is_adapter_blob()) {
1871 // static call or optimized virtual
1872 if (TraceCallFixup) {
1873 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1874 moop->print_short_name(tty);
1875 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1876 }
1877 call->set_destination_mt_safe(entry_point);
1878 } else {
1879 if (TraceCallFixup) {
1880 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1881 moop->print_short_name(tty);
1882 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1883 }
1884 // assert is too strong could also be resolve destinations.
1885 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1886 }
1887 } else {
1888 if (TraceCallFixup) {
1889 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1890 moop->print_short_name(tty);
1891 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1892 }
1893 }
1894 }
1895 }
1896 IRT_END
1897
1898
1899 // same as JVM_Arraycopy, but called directly from compiled code
1900 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1901 oopDesc* dest, jint dest_pos,
1902 jint length,
1903 JavaThread* thread)) {
1904 #ifndef PRODUCT
1905 _slow_array_copy_ctr++;
1906 #endif
1907 // Check if we have null pointers
1908 if (src == NULL || dest == NULL) {
1909 THROW(vmSymbols::java_lang_NullPointerException());
1910 }
1911 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1912 // even though the copy_array API also performs dynamic checks to ensure
1913 // that src and dest are truly arrays (and are conformable).
1914 // The copy_array mechanism is awkward and could be removed, but
1915 // the compilers don't call this function except as a last resort,
1916 // so it probably doesn't matter.
1917 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1918 (arrayOopDesc*)dest, dest_pos,
1919 length, thread);
1920 }
1921 JRT_END
1922
1923 // The caller of generate_class_cast_message() (or one of its callers)
1924 // must use a ResourceMark in order to correctly free the result.
1925 char* SharedRuntime::generate_class_cast_message(
1926 JavaThread* thread, Klass* caster_klass) {
1927
1928 // Get target class name from the checkcast instruction
1929 vframeStream vfst(thread, true);
1930 assert(!vfst.at_end(), "Java frame must exist");
1931 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1932 Klass* target_klass = vfst.method()->constants()->klass_at(
1933 cc.index(), thread);
1934 return generate_class_cast_message(caster_klass, target_klass);
1935 }
1936
1937 // The caller of class_loader_and_module_name() (or one of its callers)
1938 // must use a ResourceMark in order to correctly free the result.
1939 const char* class_loader_and_module_name(Klass* klass) {
1940 const char* delim = "/";
1941 int delim_len = strlen(delim);
1942
1943 const char* fqn = klass->external_name();
1944 // Length of message to return; always include FQN
1945 size_t msglen = strlen(fqn) + 1;
1946
1947 bool has_cl_name = false;
1948 bool has_mod_name = false;
1949 bool has_version = false;
1950
1951 // Use class loader name, if exists and not builtin
1952 const char* class_loader_name = "";
1953 ClassLoaderData* cld = klass->class_loader_data();
1954 if (cld == NULL || !cld->is_builtin_class_loader_data()) {
1955 // If not builtin, look for internal name
1956 oop loader = klass->class_loader();
1957 if (loader != NULL) {
1958 oopDesc* class_loader = java_lang_ClassLoader::name(loader);
1959 if (class_loader != NULL && class_loader->klass() != NULL) {
1960 class_loader_name = class_loader->klass()->internal_name();
1961 if (class_loader_name != NULL && class_loader_name[0] != '\0') {
1962 has_cl_name = true;
1963 msglen += strlen(class_loader_name) + delim_len;
1964 }
1965 }
1966 }
1967 }
1968
1969 const char* module_name = "";
1970 const char* version = "";
1971 Klass* bottom_klass = klass->is_objArray_klass() ?
1972 ObjArrayKlass::cast(klass)->bottom_klass() : klass;
1973 if (bottom_klass->is_instance_klass()) {
1974 ModuleEntry* module = InstanceKlass::cast(bottom_klass)->module();
1975 // Use module name, if exists
1976 if (module->is_named()) {
1977 has_mod_name = true;
1978 module_name = module->name()->as_C_string();
1979 msglen += strlen(module_name);
1980 // Use version if exists and is not a jdk module
1981 if (module->is_non_jdk_module() && module->version() != NULL) {
1982 has_version = true;
1983 version = module->version()->as_C_string();
1984 msglen += strlen("@") + strlen(version);
1985 }
1986 }
1987 } else {
1988 // klass is an array of primitives, so its module is java.base
1989 module_name = "java.base";
1990 }
1991
1992 if (has_cl_name || has_mod_name) {
1993 msglen += delim_len;
1994 }
1995
1996 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1997
1998 // Just return the FQN if error in allocating string
1999 if (message == NULL) {
2000 return fqn;
2001 }
2002
2003 jio_snprintf(message, msglen, "%s%s%s%s%s%s%s",
2004 class_loader_name,
2005 (has_cl_name) ? delim : "",
2006 (has_mod_name) ? module_name : "",
2007 (has_version) ? "@" : "",
2008 (has_version) ? version : "",
2009 (has_cl_name || has_mod_name) ? delim : "",
2010 fqn);
2011 return message;
2012 }
2013
2014 char* SharedRuntime::generate_class_cast_message(
2015 Klass* caster_klass, Klass* target_klass) {
2016
2017 const char* caster_name = class_loader_and_module_name(caster_klass);
2018
2019 const char* target_name = class_loader_and_module_name(target_klass);
2020
2021 size_t msglen = strlen(caster_name) + strlen(" cannot be cast to ") + strlen(target_name) + 1;
2022
2023 char* message = NEW_RESOURCE_ARRAY(char, msglen);
2024 if (NULL == message) {
2025 // Shouldn't happen, but don't cause even more problems if it does
2026 message = const_cast<char*>(caster_klass->external_name());
2027 } else {
2028 jio_snprintf(message,
2029 msglen,
2030 "%s cannot be cast to %s",
2031 caster_name,
2032 target_name);
2033 }
2034 return message;
2035 }
2036
2037 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2038 (void) JavaThread::current()->reguard_stack();
2039 JRT_END
2040
2041
2042 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
2043 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
2044 // Disable ObjectSynchronizer::quick_enter() in default config
2045 // on AARCH64 and ARM until JDK-8153107 is resolved.
2046 if (ARM_ONLY((SyncFlags & 256) != 0 &&)
2047 AARCH64_ONLY((SyncFlags & 256) != 0 &&)
2048 !SafepointSynchronize::is_synchronizing()) {
2049 // Only try quick_enter() if we're not trying to reach a safepoint
2050 // so that the calling thread reaches the safepoint more quickly.
2051 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return;
2052 }
2053 // NO_ASYNC required because an async exception on the state transition destructor
2054 // would leave you with the lock held and it would never be released.
2055 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2056 // and the model is that an exception implies the method failed.
2057 JRT_BLOCK_NO_ASYNC
2058 oop obj(_obj);
2059 if (PrintBiasedLockingStatistics) {
2060 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
2061 }
2062 Handle h_obj(THREAD, obj);
2063 if (UseBiasedLocking) {
2064 // Retry fast entry if bias is revoked to avoid unnecessary inflation
2065 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
2066 } else {
2067 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
2068 }
2069 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2070 JRT_BLOCK_END
2071 JRT_END
2072
2073 // Handles the uncommon cases of monitor unlocking in compiled code
2074 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD))
2075 oop obj(_obj);
2076 assert(JavaThread::current() == THREAD, "invariant");
2077 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
2078 // testing was unable to ever fire the assert that guarded it so I have removed it.
2079 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
2080 #undef MIGHT_HAVE_PENDING
2081 #ifdef MIGHT_HAVE_PENDING
2082 // Save and restore any pending_exception around the exception mark.
2083 // While the slow_exit must not throw an exception, we could come into
2084 // this routine with one set.
2085 oop pending_excep = NULL;
2086 const char* pending_file;
2087 int pending_line;
2088 if (HAS_PENDING_EXCEPTION) {
2089 pending_excep = PENDING_EXCEPTION;
2090 pending_file = THREAD->exception_file();
2091 pending_line = THREAD->exception_line();
2092 CLEAR_PENDING_EXCEPTION;
2093 }
2094 #endif /* MIGHT_HAVE_PENDING */
2095
2096 {
2097 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2098 EXCEPTION_MARK;
2099 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
2100 }
2101
2102 #ifdef MIGHT_HAVE_PENDING
2103 if (pending_excep != NULL) {
2104 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
2105 }
2106 #endif /* MIGHT_HAVE_PENDING */
2107 JRT_END
2108
2109 #ifndef PRODUCT
2110
2111 void SharedRuntime::print_statistics() {
2112 ttyLocker ttyl;
2113 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
2114
2115 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
2116
2117 SharedRuntime::print_ic_miss_histogram();
2118
2119 if (CountRemovableExceptions) {
2120 if (_nof_removable_exceptions > 0) {
2121 Unimplemented(); // this counter is not yet incremented
2122 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
2123 }
2124 }
2125
2126 // Dump the JRT_ENTRY counters
2127 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
2128 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr);
2129 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
2130 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
2131 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
2132 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
2133 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
2134
2135 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr);
2136 tty->print_cr("%5d wrong method", _wrong_method_ctr);
2137 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr);
2138 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr);
2139 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2140
2141 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr);
2142 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr);
2143 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr);
2144 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr);
2145 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr);
2146 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr);
2147 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr);
2148 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr);
2149 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr);
2150 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr);
2151 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr);
2152 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr);
2153 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr);
2154 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr);
2155 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr);
2156 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr);
2157
2158 AdapterHandlerLibrary::print_statistics();
2159
2160 if (xtty != NULL) xtty->tail("statistics");
2161 }
2162
2163 inline double percent(int x, int y) {
2164 return 100.0 * x / MAX2(y, 1);
2165 }
2166
2167 class MethodArityHistogram {
2168 public:
2169 enum { MAX_ARITY = 256 };
2170 private:
2171 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2172 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2173 static int _max_arity; // max. arity seen
2174 static int _max_size; // max. arg size seen
2175
2176 static void add_method_to_histogram(nmethod* nm) {
2177 Method* m = nm->method();
2178 ArgumentCount args(m->signature());
2179 int arity = args.size() + (m->is_static() ? 0 : 1);
2180 int argsize = m->size_of_parameters();
2181 arity = MIN2(arity, MAX_ARITY-1);
2182 argsize = MIN2(argsize, MAX_ARITY-1);
2183 int count = nm->method()->compiled_invocation_count();
2184 _arity_histogram[arity] += count;
2185 _size_histogram[argsize] += count;
2186 _max_arity = MAX2(_max_arity, arity);
2187 _max_size = MAX2(_max_size, argsize);
2188 }
2189
2190 void print_histogram_helper(int n, int* histo, const char* name) {
2191 const int N = MIN2(5, n);
2192 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2193 double sum = 0;
2194 double weighted_sum = 0;
2195 int i;
2196 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2197 double rest = sum;
2198 double percent = sum / 100;
2199 for (i = 0; i <= N; i++) {
2200 rest -= histo[i];
2201 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2202 }
2203 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2204 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2205 }
2206
2207 void print_histogram() {
2208 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2209 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2210 tty->print_cr("\nSame for parameter size (in words):");
2211 print_histogram_helper(_max_size, _size_histogram, "size");
2212 tty->cr();
2213 }
2214
2215 public:
2216 MethodArityHistogram() {
2217 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2218 _max_arity = _max_size = 0;
2219 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2220 CodeCache::nmethods_do(add_method_to_histogram);
2221 print_histogram();
2222 }
2223 };
2224
2225 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2226 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2227 int MethodArityHistogram::_max_arity;
2228 int MethodArityHistogram::_max_size;
2229
2230 void SharedRuntime::print_call_statistics(int comp_total) {
2231 tty->print_cr("Calls from compiled code:");
2232 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2233 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2234 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2235 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2236 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2237 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2238 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2239 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2240 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2241 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2242 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2243 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2244 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2245 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2246 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2247 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2248 tty->cr();
2249 tty->print_cr("Note 1: counter updates are not MT-safe.");
2250 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2251 tty->print_cr(" %% in nested categories are relative to their category");
2252 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2253 tty->cr();
2254
2255 MethodArityHistogram h;
2256 }
2257 #endif
2258
2259
2260 // A simple wrapper class around the calling convention information
2261 // that allows sharing of adapters for the same calling convention.
2262 class AdapterFingerPrint : public CHeapObj<mtCode> {
2263 private:
2264 enum {
2265 _basic_type_bits = 4,
2266 _basic_type_mask = right_n_bits(_basic_type_bits),
2267 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2268 _compact_int_count = 3
2269 };
2270 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2271 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2272
2273 union {
2274 int _compact[_compact_int_count];
2275 int* _fingerprint;
2276 } _value;
2277 int _length; // A negative length indicates the fingerprint is in the compact form,
2278 // Otherwise _value._fingerprint is the array.
2279
2280 // Remap BasicTypes that are handled equivalently by the adapters.
2281 // These are correct for the current system but someday it might be
2282 // necessary to make this mapping platform dependent.
2283 static int adapter_encoding(BasicType in) {
2284 switch (in) {
2285 case T_BOOLEAN:
2286 case T_BYTE:
2287 case T_SHORT:
2288 case T_CHAR:
2289 // There are all promoted to T_INT in the calling convention
2290 return T_INT;
2291
2292 case T_OBJECT:
2293 case T_ARRAY:
2294 // In other words, we assume that any register good enough for
2295 // an int or long is good enough for a managed pointer.
2296 #ifdef _LP64
2297 return T_LONG;
2298 #else
2299 return T_INT;
2300 #endif
2301
2302 case T_INT:
2303 case T_LONG:
2304 case T_FLOAT:
2305 case T_DOUBLE:
2306 case T_VOID:
2307 return in;
2308
2309 default:
2310 ShouldNotReachHere();
2311 return T_CONFLICT;
2312 }
2313 }
2314
2315 public:
2316 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2317 // The fingerprint is based on the BasicType signature encoded
2318 // into an array of ints with eight entries per int.
2319 int* ptr;
2320 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2321 if (len <= _compact_int_count) {
2322 assert(_compact_int_count == 3, "else change next line");
2323 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2324 // Storing the signature encoded as signed chars hits about 98%
2325 // of the time.
2326 _length = -len;
2327 ptr = _value._compact;
2328 } else {
2329 _length = len;
2330 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2331 ptr = _value._fingerprint;
2332 }
2333
2334 // Now pack the BasicTypes with 8 per int
2335 int sig_index = 0;
2336 for (int index = 0; index < len; index++) {
2337 int value = 0;
2338 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2339 int bt = ((sig_index < total_args_passed)
2340 ? adapter_encoding(sig_bt[sig_index++])
2341 : 0);
2342 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2343 value = (value << _basic_type_bits) | bt;
2344 }
2345 ptr[index] = value;
2346 }
2347 }
2348
2349 ~AdapterFingerPrint() {
2350 if (_length > 0) {
2351 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2352 }
2353 }
2354
2355 int value(int index) {
2356 if (_length < 0) {
2357 return _value._compact[index];
2358 }
2359 return _value._fingerprint[index];
2360 }
2361 int length() {
2362 if (_length < 0) return -_length;
2363 return _length;
2364 }
2365
2366 bool is_compact() {
2367 return _length <= 0;
2368 }
2369
2370 unsigned int compute_hash() {
2371 int hash = 0;
2372 for (int i = 0; i < length(); i++) {
2373 int v = value(i);
2374 hash = (hash << 8) ^ v ^ (hash >> 5);
2375 }
2376 return (unsigned int)hash;
2377 }
2378
2379 const char* as_string() {
2380 stringStream st;
2381 st.print("0x");
2382 for (int i = 0; i < length(); i++) {
2383 st.print("%08x", value(i));
2384 }
2385 return st.as_string();
2386 }
2387
2388 bool equals(AdapterFingerPrint* other) {
2389 if (other->_length != _length) {
2390 return false;
2391 }
2392 if (_length < 0) {
2393 assert(_compact_int_count == 3, "else change next line");
2394 return _value._compact[0] == other->_value._compact[0] &&
2395 _value._compact[1] == other->_value._compact[1] &&
2396 _value._compact[2] == other->_value._compact[2];
2397 } else {
2398 for (int i = 0; i < _length; i++) {
2399 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2400 return false;
2401 }
2402 }
2403 }
2404 return true;
2405 }
2406 };
2407
2408
2409 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2410 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2411 friend class AdapterHandlerTableIterator;
2412
2413 private:
2414
2415 #ifndef PRODUCT
2416 static int _lookups; // number of calls to lookup
2417 static int _buckets; // number of buckets checked
2418 static int _equals; // number of buckets checked with matching hash
2419 static int _hits; // number of successful lookups
2420 static int _compact; // number of equals calls with compact signature
2421 #endif
2422
2423 AdapterHandlerEntry* bucket(int i) {
2424 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2425 }
2426
2427 public:
2428 AdapterHandlerTable()
2429 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { }
2430
2431 // Create a new entry suitable for insertion in the table
2432 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2433 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2434 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2435 if (DumpSharedSpaces) {
2436 ((CDSAdapterHandlerEntry*)entry)->init();
2437 }
2438 return entry;
2439 }
2440
2441 // Insert an entry into the table
2442 void add(AdapterHandlerEntry* entry) {
2443 int index = hash_to_index(entry->hash());
2444 add_entry(index, entry);
2445 }
2446
2447 void free_entry(AdapterHandlerEntry* entry) {
2448 entry->deallocate();
2449 BasicHashtable<mtCode>::free_entry(entry);
2450 }
2451
2452 // Find a entry with the same fingerprint if it exists
2453 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2454 NOT_PRODUCT(_lookups++);
2455 AdapterFingerPrint fp(total_args_passed, sig_bt);
2456 unsigned int hash = fp.compute_hash();
2457 int index = hash_to_index(hash);
2458 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2459 NOT_PRODUCT(_buckets++);
2460 if (e->hash() == hash) {
2461 NOT_PRODUCT(_equals++);
2462 if (fp.equals(e->fingerprint())) {
2463 #ifndef PRODUCT
2464 if (fp.is_compact()) _compact++;
2465 _hits++;
2466 #endif
2467 return e;
2468 }
2469 }
2470 }
2471 return NULL;
2472 }
2473
2474 #ifndef PRODUCT
2475 void print_statistics() {
2476 ResourceMark rm;
2477 int longest = 0;
2478 int empty = 0;
2479 int total = 0;
2480 int nonempty = 0;
2481 for (int index = 0; index < table_size(); index++) {
2482 int count = 0;
2483 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2484 count++;
2485 }
2486 if (count != 0) nonempty++;
2487 if (count == 0) empty++;
2488 if (count > longest) longest = count;
2489 total += count;
2490 }
2491 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2492 empty, longest, total, total / (double)nonempty);
2493 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2494 _lookups, _buckets, _equals, _hits, _compact);
2495 }
2496 #endif
2497 };
2498
2499
2500 #ifndef PRODUCT
2501
2502 int AdapterHandlerTable::_lookups;
2503 int AdapterHandlerTable::_buckets;
2504 int AdapterHandlerTable::_equals;
2505 int AdapterHandlerTable::_hits;
2506 int AdapterHandlerTable::_compact;
2507
2508 #endif
2509
2510 class AdapterHandlerTableIterator : public StackObj {
2511 private:
2512 AdapterHandlerTable* _table;
2513 int _index;
2514 AdapterHandlerEntry* _current;
2515
2516 void scan() {
2517 while (_index < _table->table_size()) {
2518 AdapterHandlerEntry* a = _table->bucket(_index);
2519 _index++;
2520 if (a != NULL) {
2521 _current = a;
2522 return;
2523 }
2524 }
2525 }
2526
2527 public:
2528 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2529 scan();
2530 }
2531 bool has_next() {
2532 return _current != NULL;
2533 }
2534 AdapterHandlerEntry* next() {
2535 if (_current != NULL) {
2536 AdapterHandlerEntry* result = _current;
2537 _current = _current->next();
2538 if (_current == NULL) scan();
2539 return result;
2540 } else {
2541 return NULL;
2542 }
2543 }
2544 };
2545
2546
2547 // ---------------------------------------------------------------------------
2548 // Implementation of AdapterHandlerLibrary
2549 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2550 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2551 const int AdapterHandlerLibrary_size = 16*K;
2552 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2553
2554 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2555 // Should be called only when AdapterHandlerLibrary_lock is active.
2556 if (_buffer == NULL) // Initialize lazily
2557 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2558 return _buffer;
2559 }
2560
2561 extern "C" void unexpected_adapter_call() {
2562 ShouldNotCallThis();
2563 }
2564
2565 void AdapterHandlerLibrary::initialize() {
2566 if (_adapters != NULL) return;
2567 _adapters = new AdapterHandlerTable();
2568
2569 if (!CodeCacheExtensions::skip_compiler_support()) {
2570 // Create a special handler for abstract methods. Abstract methods
2571 // are never compiled so an i2c entry is somewhat meaningless, but
2572 // throw AbstractMethodError just in case.
2573 // Pass wrong_method_abstract for the c2i transitions to return
2574 // AbstractMethodError for invalid invocations.
2575 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2576 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2577 StubRoutines::throw_AbstractMethodError_entry(),
2578 wrong_method_abstract, wrong_method_abstract);
2579 } else {
2580 // Adapters are not supposed to be used.
2581 // Generate a special one to cause an error if used (and store this
2582 // singleton in place of the useless _abstract_method_error adapter).
2583 address entry = (address) &unexpected_adapter_call;
2584 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2585 entry,
2586 entry,
2587 entry);
2588
2589 }
2590 }
2591
2592 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2593 address i2c_entry,
2594 address c2i_entry,
2595 address c2i_unverified_entry) {
2596 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2597 }
2598
2599 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2600 AdapterHandlerEntry* entry = get_adapter0(method);
2601 if (method->is_shared()) {
2602 MutexLocker mu(AdapterHandlerLibrary_lock);
2603 if (method->adapter() == NULL) {
2604 method->update_adapter_trampoline(entry);
2605 }
2606 address trampoline = method->from_compiled_entry();
2607 if (*(int*)trampoline == 0) {
2608 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size());
2609 MacroAssembler _masm(&buffer);
2610 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry());
2611
2612 if (PrintInterpreter) {
2613 Disassembler::decode(buffer.insts_begin(), buffer.insts_end());
2614 }
2615 }
2616 }
2617
2618 return entry;
2619 }
2620
2621 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) {
2622 // Use customized signature handler. Need to lock around updates to
2623 // the AdapterHandlerTable (it is not safe for concurrent readers
2624 // and a single writer: this could be fixed if it becomes a
2625 // problem).
2626
2627 ResourceMark rm;
2628
2629 NOT_PRODUCT(int insts_size);
2630 AdapterBlob* new_adapter = NULL;
2631 AdapterHandlerEntry* entry = NULL;
2632 AdapterFingerPrint* fingerprint = NULL;
2633 {
2634 MutexLocker mu(AdapterHandlerLibrary_lock);
2635 // make sure data structure is initialized
2636 initialize();
2637
2638 // during dump time, always generate adapters, even if the
2639 // compiler has been turned off.
2640 if (!DumpSharedSpaces && CodeCacheExtensions::skip_compiler_support()) {
2641 // adapters are useless and should not be used, including the
2642 // abstract_method_handler. However, some callers check that
2643 // an adapter was installed.
2644 // Return the singleton adapter, stored into _abstract_method_handler
2645 // and modified to cause an error if we ever call it.
2646 return _abstract_method_handler;
2647 }
2648
2649 if (method->is_abstract()) {
2650 return _abstract_method_handler;
2651 }
2652
2653 // Fill in the signature array, for the calling-convention call.
2654 int total_args_passed = method->size_of_parameters(); // All args on stack
2655
2656 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2657 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2658 int i = 0;
2659 if (!method->is_static()) // Pass in receiver first
2660 sig_bt[i++] = T_OBJECT;
2661 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2662 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2663 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2664 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2665 }
2666 assert(i == total_args_passed, "");
2667
2668 // Lookup method signature's fingerprint
2669 entry = _adapters->lookup(total_args_passed, sig_bt);
2670
2671 #ifdef ASSERT
2672 AdapterHandlerEntry* shared_entry = NULL;
2673 // Start adapter sharing verification only after the VM is booted.
2674 if (VerifyAdapterSharing && (entry != NULL)) {
2675 shared_entry = entry;
2676 entry = NULL;
2677 }
2678 #endif
2679
2680 if (entry != NULL) {
2681 return entry;
2682 }
2683
2684 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2685 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2686
2687 // Make a C heap allocated version of the fingerprint to store in the adapter
2688 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2689
2690 // StubRoutines::code2() is initialized after this function can be called. As a result,
2691 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2692 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2693 // stub that ensure that an I2C stub is called from an interpreter frame.
2694 bool contains_all_checks = StubRoutines::code2() != NULL;
2695
2696 // Create I2C & C2I handlers
2697 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2698 if (buf != NULL) {
2699 CodeBuffer buffer(buf);
2700 short buffer_locs[20];
2701 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2702 sizeof(buffer_locs)/sizeof(relocInfo));
2703
2704 MacroAssembler _masm(&buffer);
2705 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2706 total_args_passed,
2707 comp_args_on_stack,
2708 sig_bt,
2709 regs,
2710 fingerprint);
2711 #ifdef ASSERT
2712 if (VerifyAdapterSharing) {
2713 if (shared_entry != NULL) {
2714 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2715 // Release the one just created and return the original
2716 _adapters->free_entry(entry);
2717 return shared_entry;
2718 } else {
2719 entry->save_code(buf->code_begin(), buffer.insts_size());
2720 }
2721 }
2722 #endif
2723
2724 new_adapter = AdapterBlob::create(&buffer);
2725 NOT_PRODUCT(insts_size = buffer.insts_size());
2726 }
2727 if (new_adapter == NULL) {
2728 // CodeCache is full, disable compilation
2729 // Ought to log this but compile log is only per compile thread
2730 // and we're some non descript Java thread.
2731 return NULL; // Out of CodeCache space
2732 }
2733 entry->relocate(new_adapter->content_begin());
2734 #ifndef PRODUCT
2735 // debugging suppport
2736 if (PrintAdapterHandlers || PrintStubCode) {
2737 ttyLocker ttyl;
2738 entry->print_adapter_on(tty);
2739 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)",
2740 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2741 method->signature()->as_C_string(), fingerprint->as_string(), insts_size);
2742 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
2743 if (Verbose || PrintStubCode) {
2744 address first_pc = entry->base_address();
2745 if (first_pc != NULL) {
2746 Disassembler::decode(first_pc, first_pc + insts_size);
2747 tty->cr();
2748 }
2749 }
2750 }
2751 #endif
2752 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2753 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2754 if (contains_all_checks || !VerifyAdapterCalls) {
2755 _adapters->add(entry);
2756 }
2757 }
2758 // Outside of the lock
2759 if (new_adapter != NULL) {
2760 char blob_id[256];
2761 jio_snprintf(blob_id,
2762 sizeof(blob_id),
2763 "%s(%s)@" PTR_FORMAT,
2764 new_adapter->name(),
2765 fingerprint->as_string(),
2766 new_adapter->content_begin());
2767 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2768
2769 if (JvmtiExport::should_post_dynamic_code_generated()) {
2770 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2771 }
2772 }
2773 return entry;
2774 }
2775
2776 address AdapterHandlerEntry::base_address() {
2777 address base = _i2c_entry;
2778 if (base == NULL) base = _c2i_entry;
2779 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2780 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2781 return base;
2782 }
2783
2784 void AdapterHandlerEntry::relocate(address new_base) {
2785 address old_base = base_address();
2786 assert(old_base != NULL, "");
2787 ptrdiff_t delta = new_base - old_base;
2788 if (_i2c_entry != NULL)
2789 _i2c_entry += delta;
2790 if (_c2i_entry != NULL)
2791 _c2i_entry += delta;
2792 if (_c2i_unverified_entry != NULL)
2793 _c2i_unverified_entry += delta;
2794 assert(base_address() == new_base, "");
2795 }
2796
2797
2798 void AdapterHandlerEntry::deallocate() {
2799 delete _fingerprint;
2800 #ifdef ASSERT
2801 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2802 #endif
2803 }
2804
2805
2806 #ifdef ASSERT
2807 // Capture the code before relocation so that it can be compared
2808 // against other versions. If the code is captured after relocation
2809 // then relative instructions won't be equivalent.
2810 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2811 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2812 _saved_code_length = length;
2813 memcpy(_saved_code, buffer, length);
2814 }
2815
2816
2817 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2818 if (length != _saved_code_length) {
2819 return false;
2820 }
2821
2822 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2823 }
2824 #endif
2825
2826
2827 /**
2828 * Create a native wrapper for this native method. The wrapper converts the
2829 * Java-compiled calling convention to the native convention, handles
2830 * arguments, and transitions to native. On return from the native we transition
2831 * back to java blocking if a safepoint is in progress.
2832 */
2833 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2834 ResourceMark rm;
2835 nmethod* nm = NULL;
2836
2837 assert(method->is_native(), "must be native");
2838 assert(method->is_method_handle_intrinsic() ||
2839 method->has_native_function(), "must have something valid to call!");
2840
2841 {
2842 // Perform the work while holding the lock, but perform any printing outside the lock
2843 MutexLocker mu(AdapterHandlerLibrary_lock);
2844 // See if somebody beat us to it
2845 if (method->code() != NULL) {
2846 return;
2847 }
2848
2849 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2850 assert(compile_id > 0, "Must generate native wrapper");
2851
2852
2853 ResourceMark rm;
2854 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2855 if (buf != NULL) {
2856 CodeBuffer buffer(buf);
2857 double locs_buf[20];
2858 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2859 MacroAssembler _masm(&buffer);
2860
2861 // Fill in the signature array, for the calling-convention call.
2862 const int total_args_passed = method->size_of_parameters();
2863
2864 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2865 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2866 int i=0;
2867 if (!method->is_static()) // Pass in receiver first
2868 sig_bt[i++] = T_OBJECT;
2869 SignatureStream ss(method->signature());
2870 for (; !ss.at_return_type(); ss.next()) {
2871 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2872 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2873 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2874 }
2875 assert(i == total_args_passed, "");
2876 BasicType ret_type = ss.type();
2877
2878 // Now get the compiled-Java layout as input (or output) arguments.
2879 // NOTE: Stubs for compiled entry points of method handle intrinsics
2880 // are just trampolines so the argument registers must be outgoing ones.
2881 const bool is_outgoing = method->is_method_handle_intrinsic();
2882 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2883
2884 // Generate the compiled-to-native wrapper code
2885 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2886
2887 if (nm != NULL) {
2888 method->set_code(method, nm);
2889
2890 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
2891 if (directive->PrintAssemblyOption) {
2892 nm->print_code();
2893 }
2894 DirectivesStack::release(directive);
2895 }
2896 }
2897 } // Unlock AdapterHandlerLibrary_lock
2898
2899
2900 // Install the generated code.
2901 if (nm != NULL) {
2902 if (PrintCompilation) {
2903 ttyLocker ttyl;
2904 CompileTask::print(tty, nm, method->is_static() ? "(static)" : "");
2905 }
2906 nm->post_compiled_method_load_event();
2907 }
2908 }
2909
2910 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2911 assert(thread == JavaThread::current(), "must be");
2912 // The code is about to enter a JNI lazy critical native method and
2913 // _needs_gc is true, so if this thread is already in a critical
2914 // section then just return, otherwise this thread should block
2915 // until needs_gc has been cleared.
2916 if (thread->in_critical()) {
2917 return;
2918 }
2919 // Lock and unlock a critical section to give the system a chance to block
2920 GCLocker::lock_critical(thread);
2921 GCLocker::unlock_critical(thread);
2922 JRT_END
2923
2924 // -------------------------------------------------------------------------
2925 // Java-Java calling convention
2926 // (what you use when Java calls Java)
2927
2928 //------------------------------name_for_receiver----------------------------------
2929 // For a given signature, return the VMReg for parameter 0.
2930 VMReg SharedRuntime::name_for_receiver() {
2931 VMRegPair regs;
2932 BasicType sig_bt = T_OBJECT;
2933 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2934 // Return argument 0 register. In the LP64 build pointers
2935 // take 2 registers, but the VM wants only the 'main' name.
2936 return regs.first();
2937 }
2938
2939 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2940 // This method is returning a data structure allocating as a
2941 // ResourceObject, so do not put any ResourceMarks in here.
2942 char *s = sig->as_C_string();
2943 int len = (int)strlen(s);
2944 s++; len--; // Skip opening paren
2945
2946 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2947 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2948 int cnt = 0;
2949 if (has_receiver) {
2950 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2951 }
2952
2953 while (*s != ')') { // Find closing right paren
2954 switch (*s++) { // Switch on signature character
2955 case 'B': sig_bt[cnt++] = T_BYTE; break;
2956 case 'C': sig_bt[cnt++] = T_CHAR; break;
2957 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2958 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2959 case 'I': sig_bt[cnt++] = T_INT; break;
2960 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2961 case 'S': sig_bt[cnt++] = T_SHORT; break;
2962 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2963 case 'V': sig_bt[cnt++] = T_VOID; break;
2964 case 'L': // Oop
2965 while (*s++ != ';'); // Skip signature
2966 sig_bt[cnt++] = T_OBJECT;
2967 break;
2968 case '[': { // Array
2969 do { // Skip optional size
2970 while (*s >= '0' && *s <= '9') s++;
2971 } while (*s++ == '['); // Nested arrays?
2972 // Skip element type
2973 if (s[-1] == 'L')
2974 while (*s++ != ';'); // Skip signature
2975 sig_bt[cnt++] = T_ARRAY;
2976 break;
2977 }
2978 default : ShouldNotReachHere();
2979 }
2980 }
2981
2982 if (has_appendix) {
2983 sig_bt[cnt++] = T_OBJECT;
2984 }
2985
2986 assert(cnt < 256, "grow table size");
2987
2988 int comp_args_on_stack;
2989 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2990
2991 // the calling convention doesn't count out_preserve_stack_slots so
2992 // we must add that in to get "true" stack offsets.
2993
2994 if (comp_args_on_stack) {
2995 for (int i = 0; i < cnt; i++) {
2996 VMReg reg1 = regs[i].first();
2997 if (reg1->is_stack()) {
2998 // Yuck
2999 reg1 = reg1->bias(out_preserve_stack_slots());
3000 }
3001 VMReg reg2 = regs[i].second();
3002 if (reg2->is_stack()) {
3003 // Yuck
3004 reg2 = reg2->bias(out_preserve_stack_slots());
3005 }
3006 regs[i].set_pair(reg2, reg1);
3007 }
3008 }
3009
3010 // results
3011 *arg_size = cnt;
3012 return regs;
3013 }
3014
3015 // OSR Migration Code
3016 //
3017 // This code is used convert interpreter frames into compiled frames. It is
3018 // called from very start of a compiled OSR nmethod. A temp array is
3019 // allocated to hold the interesting bits of the interpreter frame. All
3020 // active locks are inflated to allow them to move. The displaced headers and
3021 // active interpreter locals are copied into the temp buffer. Then we return
3022 // back to the compiled code. The compiled code then pops the current
3023 // interpreter frame off the stack and pushes a new compiled frame. Then it
3024 // copies the interpreter locals and displaced headers where it wants.
3025 // Finally it calls back to free the temp buffer.
3026 //
3027 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3028
3029 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
3030
3031 //
3032 // This code is dependent on the memory layout of the interpreter local
3033 // array and the monitors. On all of our platforms the layout is identical
3034 // so this code is shared. If some platform lays the their arrays out
3035 // differently then this code could move to platform specific code or
3036 // the code here could be modified to copy items one at a time using
3037 // frame accessor methods and be platform independent.
3038
3039 frame fr = thread->last_frame();
3040 assert(fr.is_interpreted_frame(), "");
3041 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3042
3043 // Figure out how many monitors are active.
3044 int active_monitor_count = 0;
3045 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3046 kptr < fr.interpreter_frame_monitor_begin();
3047 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3048 if (kptr->obj() != NULL) active_monitor_count++;
3049 }
3050
3051 // QQQ we could place number of active monitors in the array so that compiled code
3052 // could double check it.
3053
3054 Method* moop = fr.interpreter_frame_method();
3055 int max_locals = moop->max_locals();
3056 // Allocate temp buffer, 1 word per local & 2 per active monitor
3057 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3058 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3059
3060 // Copy the locals. Order is preserved so that loading of longs works.
3061 // Since there's no GC I can copy the oops blindly.
3062 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3063 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3064 (HeapWord*)&buf[0],
3065 max_locals);
3066
3067 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3068 int i = max_locals;
3069 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3070 kptr2 < fr.interpreter_frame_monitor_begin();
3071 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3072 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
3073 BasicLock *lock = kptr2->lock();
3074 // Inflate so the displaced header becomes position-independent
3075 if (lock->displaced_header()->is_unlocked())
3076 ObjectSynchronizer::inflate_helper(kptr2->obj());
3077 // Now the displaced header is free to move
3078 buf[i++] = (intptr_t)lock->displaced_header();
3079 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3080 }
3081 }
3082 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3083
3084 return buf;
3085 JRT_END
3086
3087 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3088 FREE_C_HEAP_ARRAY(intptr_t, buf);
3089 JRT_END
3090
3091 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3092 AdapterHandlerTableIterator iter(_adapters);
3093 while (iter.has_next()) {
3094 AdapterHandlerEntry* a = iter.next();
3095 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true;
3096 }
3097 return false;
3098 }
3099
3100 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3101 AdapterHandlerTableIterator iter(_adapters);
3102 while (iter.has_next()) {
3103 AdapterHandlerEntry* a = iter.next();
3104 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3105 st->print("Adapter for signature: ");
3106 a->print_adapter_on(tty);
3107 return;
3108 }
3109 }
3110 assert(false, "Should have found handler");
3111 }
3112
3113 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3114 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
3115 p2i(this), fingerprint()->as_string(),
3116 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry()));
3117
3118 }
3119
3120 #if INCLUDE_CDS
3121
3122 void CDSAdapterHandlerEntry::init() {
3123 assert(DumpSharedSpaces, "used during dump time only");
3124 _c2i_entry_trampoline = (address)MetaspaceShared::misc_data_space_alloc(SharedRuntime::trampoline_size());
3125 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_data_space_alloc(sizeof(AdapterHandlerEntry*));
3126 };
3127
3128 #endif // INCLUDE_CDS
3129
3130
3131 #ifndef PRODUCT
3132
3133 void AdapterHandlerLibrary::print_statistics() {
3134 _adapters->print_statistics();
3135 }
3136
3137 #endif /* PRODUCT */
3138
3139 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread))
3140 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone");
3141 thread->enable_stack_reserved_zone();
3142 thread->set_reserved_stack_activation(thread->stack_base());
3143 JRT_END
3144
3145 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) {
3146 frame activation;
3147 CompiledMethod* nm = NULL;
3148 int count = 1;
3149
3150 assert(fr.is_java_frame(), "Must start on Java frame");
3151
3152 while (true) {
3153 Method* method = NULL;
3154 if (fr.is_interpreted_frame()) {
3155 method = fr.interpreter_frame_method();
3156 } else {
3157 CodeBlob* cb = fr.cb();
3158 if (cb != NULL && cb->is_compiled()) {
3159 nm = cb->as_compiled_method();
3160 method = nm->method();
3161 }
3162 }
3163 if ((method != NULL) && method->has_reserved_stack_access()) {
3164 ResourceMark rm(thread);
3165 activation = fr;
3166 warning("Potentially dangerous stack overflow in "
3167 "ReservedStackAccess annotated method %s [%d]",
3168 method->name_and_sig_as_C_string(), count++);
3169 EventReservedStackActivation event;
3170 if (event.should_commit()) {
3171 event.set_method(method);
3172 event.commit();
3173 }
3174 }
3175 if (fr.is_first_java_frame()) {
3176 break;
3177 } else {
3178 fr = fr.java_sender();
3179 }
3180 }
3181 return activation;
3182 }
3183