1 /*
2 * Copyright (c) 1997, 2017, 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 "aot/aotLoader.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/compiledIC.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/jvm.h"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/methodHandles.hpp"
51 #include "prims/nativeLookup.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/atomic.hpp"
54 #include "runtime/biasedLocking.hpp"
55 #include "runtime/compilationPolicy.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/init.hpp"
58 #include "runtime/interfaceSupport.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/vframe.hpp"
64 #include "runtime/vframeArray.hpp"
65 #include "trace/tracing.hpp"
66 #include "utilities/copy.hpp"
67 #include "utilities/dtrace.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/hashtable.inline.hpp"
70 #include "utilities/macros.hpp"
71 #include "utilities/xmlstream.hpp"
72 #ifdef COMPILER1
73 #include "c1/c1_Runtime1.hpp"
74 #endif
75
76 // Shared stub locations
77 RuntimeStub* SharedRuntime::_wrong_method_blob;
78 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
79 RuntimeStub* SharedRuntime::_ic_miss_blob;
80 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
81 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
82 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
83 address SharedRuntime::_resolve_static_call_entry;
84
85 DeoptimizationBlob* SharedRuntime::_deopt_blob;
86 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
87 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
88 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
89
90 #ifdef COMPILER2
91 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
92 #endif // COMPILER2
93
94
95 //----------------------------generate_stubs-----------------------------------
96 void SharedRuntime::generate_stubs() {
97 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
98 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
99 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
100 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
101 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
102 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
103 _resolve_static_call_entry = _resolve_static_call_blob->entry_point();
104
105 #if defined(COMPILER2) || INCLUDE_JVMCI
106 // Vectors are generated only by C2 and JVMCI.
107 bool support_wide = is_wide_vector(MaxVectorSize);
108 if (support_wide) {
109 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
110 }
111 #endif // COMPILER2 || INCLUDE_JVMCI
112 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
113 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
114
115 generate_deopt_blob();
116
117 #ifdef COMPILER2
118 generate_uncommon_trap_blob();
119 #endif // COMPILER2
120 }
121
122 #include <math.h>
123
124 // Implementation of SharedRuntime
125
126 #ifndef PRODUCT
127 // For statistics
128 int SharedRuntime::_ic_miss_ctr = 0;
129 int SharedRuntime::_wrong_method_ctr = 0;
130 int SharedRuntime::_resolve_static_ctr = 0;
131 int SharedRuntime::_resolve_virtual_ctr = 0;
132 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
133 int SharedRuntime::_implicit_null_throws = 0;
134 int SharedRuntime::_implicit_div0_throws = 0;
135 int SharedRuntime::_throw_null_ctr = 0;
136
137 int SharedRuntime::_nof_normal_calls = 0;
138 int SharedRuntime::_nof_optimized_calls = 0;
139 int SharedRuntime::_nof_inlined_calls = 0;
140 int SharedRuntime::_nof_megamorphic_calls = 0;
141 int SharedRuntime::_nof_static_calls = 0;
142 int SharedRuntime::_nof_inlined_static_calls = 0;
143 int SharedRuntime::_nof_interface_calls = 0;
144 int SharedRuntime::_nof_optimized_interface_calls = 0;
145 int SharedRuntime::_nof_inlined_interface_calls = 0;
146 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
147 int SharedRuntime::_nof_removable_exceptions = 0;
148
149 int SharedRuntime::_new_instance_ctr=0;
150 int SharedRuntime::_new_array_ctr=0;
151 int SharedRuntime::_multi1_ctr=0;
152 int SharedRuntime::_multi2_ctr=0;
153 int SharedRuntime::_multi3_ctr=0;
154 int SharedRuntime::_multi4_ctr=0;
155 int SharedRuntime::_multi5_ctr=0;
156 int SharedRuntime::_mon_enter_stub_ctr=0;
157 int SharedRuntime::_mon_exit_stub_ctr=0;
158 int SharedRuntime::_mon_enter_ctr=0;
159 int SharedRuntime::_mon_exit_ctr=0;
160 int SharedRuntime::_partial_subtype_ctr=0;
161 int SharedRuntime::_jbyte_array_copy_ctr=0;
162 int SharedRuntime::_jshort_array_copy_ctr=0;
163 int SharedRuntime::_jint_array_copy_ctr=0;
164 int SharedRuntime::_jlong_array_copy_ctr=0;
165 int SharedRuntime::_oop_array_copy_ctr=0;
166 int SharedRuntime::_checkcast_array_copy_ctr=0;
167 int SharedRuntime::_unsafe_array_copy_ctr=0;
168 int SharedRuntime::_generic_array_copy_ctr=0;
169 int SharedRuntime::_slow_array_copy_ctr=0;
170 int SharedRuntime::_find_handler_ctr=0;
171 int SharedRuntime::_rethrow_ctr=0;
172
173 int SharedRuntime::_ICmiss_index = 0;
174 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
175 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
176
177
178 void SharedRuntime::trace_ic_miss(address at) {
179 for (int i = 0; i < _ICmiss_index; i++) {
180 if (_ICmiss_at[i] == at) {
181 _ICmiss_count[i]++;
182 return;
183 }
184 }
185 int index = _ICmiss_index++;
186 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
187 _ICmiss_at[index] = at;
188 _ICmiss_count[index] = 1;
189 }
190
191 void SharedRuntime::print_ic_miss_histogram() {
192 if (ICMissHistogram) {
193 tty->print_cr("IC Miss Histogram:");
194 int tot_misses = 0;
195 for (int i = 0; i < _ICmiss_index; i++) {
196 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
197 tot_misses += _ICmiss_count[i];
198 }
199 tty->print_cr("Total IC misses: %7d", tot_misses);
200 }
201 }
202 #endif // PRODUCT
203
204 #if INCLUDE_ALL_GCS
205
206 // G1 write-barrier pre: executed before a pointer store.
207 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
208 if (orig == NULL) {
209 assert(false, "should be optimized out");
210 return;
211 }
212 assert(orig->is_oop(true /* ignore mark word */), "Error");
213 // store the original value that was in the field reference
214 thread->satb_mark_queue().enqueue(orig);
215 JRT_END
216
217 // G1 write-barrier post: executed after a pointer store.
218 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
219 thread->dirty_card_queue().enqueue(card_addr);
220 JRT_END
221
222 #endif // INCLUDE_ALL_GCS
223
224
225 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
226 return x * y;
227 JRT_END
228
229
230 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
231 if (x == min_jlong && y == CONST64(-1)) {
232 return x;
233 } else {
234 return x / y;
235 }
236 JRT_END
237
238
239 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
240 if (x == min_jlong && y == CONST64(-1)) {
241 return 0;
242 } else {
243 return x % y;
244 }
245 JRT_END
246
247
248 const juint float_sign_mask = 0x7FFFFFFF;
249 const juint float_infinity = 0x7F800000;
250 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
251 const julong double_infinity = CONST64(0x7FF0000000000000);
252
253 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
254 #ifdef _WIN64
255 // 64-bit Windows on amd64 returns the wrong values for
256 // infinity operands.
257 union { jfloat f; juint i; } xbits, ybits;
258 xbits.f = x;
259 ybits.f = y;
260 // x Mod Infinity == x unless x is infinity
261 if (((xbits.i & float_sign_mask) != float_infinity) &&
262 ((ybits.i & float_sign_mask) == float_infinity) ) {
263 return x;
264 }
265 return ((jfloat)fmod_winx64((double)x, (double)y));
266 #else
267 return ((jfloat)fmod((double)x,(double)y));
268 #endif
269 JRT_END
270
271
272 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
273 #ifdef _WIN64
274 union { jdouble d; julong l; } xbits, ybits;
275 xbits.d = x;
276 ybits.d = y;
277 // x Mod Infinity == x unless x is infinity
278 if (((xbits.l & double_sign_mask) != double_infinity) &&
279 ((ybits.l & double_sign_mask) == double_infinity) ) {
280 return x;
281 }
282 return ((jdouble)fmod_winx64((double)x, (double)y));
283 #else
284 return ((jdouble)fmod((double)x,(double)y));
285 #endif
286 JRT_END
287
288 #ifdef __SOFTFP__
289 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
290 return x + y;
291 JRT_END
292
293 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
294 return x - y;
295 JRT_END
296
297 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
298 return x * y;
299 JRT_END
300
301 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
302 return x / y;
303 JRT_END
304
305 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
306 return x + y;
307 JRT_END
308
309 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
310 return x - y;
311 JRT_END
312
313 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
314 return x * y;
315 JRT_END
316
317 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
318 return x / y;
319 JRT_END
320
321 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
322 return (jfloat)x;
323 JRT_END
324
325 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
326 return (jdouble)x;
327 JRT_END
328
329 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
330 return (jdouble)x;
331 JRT_END
332
333 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
334 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
335 JRT_END
336
337 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
338 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
339 JRT_END
340
341 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
342 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
343 JRT_END
344
345 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
346 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
347 JRT_END
348
349 // Functions to return the opposite of the aeabi functions for nan.
350 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
351 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
352 JRT_END
353
354 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
355 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
356 JRT_END
357
358 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
359 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
360 JRT_END
361
362 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
363 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
364 JRT_END
365
366 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
367 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
368 JRT_END
369
370 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
371 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
372 JRT_END
373
374 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
375 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
376 JRT_END
377
378 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
379 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
380 JRT_END
381
382 // Intrinsics make gcc generate code for these.
383 float SharedRuntime::fneg(float f) {
384 return -f;
385 }
386
387 double SharedRuntime::dneg(double f) {
388 return -f;
389 }
390
391 #endif // __SOFTFP__
392
393 #if defined(__SOFTFP__) || defined(E500V2)
394 // Intrinsics make gcc generate code for these.
395 double SharedRuntime::dabs(double f) {
396 return (f <= (double)0.0) ? (double)0.0 - f : f;
397 }
398
399 #endif
400
401 #if defined(__SOFTFP__) || defined(PPC)
402 double SharedRuntime::dsqrt(double f) {
403 return sqrt(f);
404 }
405 #endif
406
407 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
408 if (g_isnan(x))
409 return 0;
410 if (x >= (jfloat) max_jint)
411 return max_jint;
412 if (x <= (jfloat) min_jint)
413 return min_jint;
414 return (jint) x;
415 JRT_END
416
417
418 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
419 if (g_isnan(x))
420 return 0;
421 if (x >= (jfloat) max_jlong)
422 return max_jlong;
423 if (x <= (jfloat) min_jlong)
424 return min_jlong;
425 return (jlong) x;
426 JRT_END
427
428
429 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
430 if (g_isnan(x))
431 return 0;
432 if (x >= (jdouble) max_jint)
433 return max_jint;
434 if (x <= (jdouble) min_jint)
435 return min_jint;
436 return (jint) x;
437 JRT_END
438
439
440 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
441 if (g_isnan(x))
442 return 0;
443 if (x >= (jdouble) max_jlong)
444 return max_jlong;
445 if (x <= (jdouble) min_jlong)
446 return min_jlong;
447 return (jlong) x;
448 JRT_END
449
450
451 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
452 return (jfloat)x;
453 JRT_END
454
455
456 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
457 return (jfloat)x;
458 JRT_END
459
460
461 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
462 return (jdouble)x;
463 JRT_END
464
465 // Exception handling across interpreter/compiler boundaries
466 //
467 // exception_handler_for_return_address(...) returns the continuation address.
468 // The continuation address is the entry point of the exception handler of the
469 // previous frame depending on the return address.
470
471 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
472 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
473 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
474
475 // Reset method handle flag.
476 thread->set_is_method_handle_return(false);
477
478 #if INCLUDE_JVMCI
479 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
480 // and other exception handler continuations do not read it
481 thread->set_exception_pc(NULL);
482 #endif // INCLUDE_JVMCI
483
484 // The fastest case first
485 CodeBlob* blob = CodeCache::find_blob(return_address);
486 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL;
487 if (nm != NULL) {
488 // Set flag if return address is a method handle call site.
489 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
490 // native nmethods don't have exception handlers
491 assert(!nm->is_native_method(), "no exception handler");
492 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
493 if (nm->is_deopt_pc(return_address)) {
494 // If we come here because of a stack overflow, the stack may be
495 // unguarded. Reguard the stack otherwise if we return to the
496 // deopt blob and the stack bang causes a stack overflow we
497 // crash.
498 bool guard_pages_enabled = thread->stack_guards_enabled();
499 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
500 if (thread->reserved_stack_activation() != thread->stack_base()) {
501 thread->set_reserved_stack_activation(thread->stack_base());
502 }
503 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
504 return SharedRuntime::deopt_blob()->unpack_with_exception();
505 } else {
506 return nm->exception_begin();
507 }
508 }
509
510 // Entry code
511 if (StubRoutines::returns_to_call_stub(return_address)) {
512 return StubRoutines::catch_exception_entry();
513 }
514 // Interpreted code
515 if (Interpreter::contains(return_address)) {
516 return Interpreter::rethrow_exception_entry();
517 }
518
519 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
520 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
521
522 #ifndef PRODUCT
523 { ResourceMark rm;
524 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
525 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
526 tty->print_cr("b) other problem");
527 }
528 #endif // PRODUCT
529
530 ShouldNotReachHere();
531 return NULL;
532 }
533
534
535 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
536 return raw_exception_handler_for_return_address(thread, return_address);
537 JRT_END
538
539
540 address SharedRuntime::get_poll_stub(address pc) {
541 address stub;
542 // Look up the code blob
543 CodeBlob *cb = CodeCache::find_blob(pc);
544
545 // Should be an nmethod
546 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod");
547
548 // Look up the relocation information
549 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc),
550 "safepoint polling: type must be poll");
551
552 #ifdef ASSERT
553 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
554 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
555 Disassembler::decode(cb);
556 fatal("Only polling locations are used for safepoint");
557 }
558 #endif
559
560 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc);
561 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors();
562 if (at_poll_return) {
563 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
564 "polling page return stub not created yet");
565 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
566 } else if (has_wide_vectors) {
567 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
568 "polling page vectors safepoint stub not created yet");
569 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
570 } else {
571 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
572 "polling page safepoint stub not created yet");
573 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
574 }
575 log_debug(safepoint)("... found polling page %s exception at pc = "
576 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
577 at_poll_return ? "return" : "loop",
578 (intptr_t)pc, (intptr_t)stub);
579 return stub;
580 }
581
582
583 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
584 assert(caller.is_interpreted_frame(), "");
585 int args_size = ArgumentSizeComputer(sig).size() + 1;
586 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
587 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
588 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
589 return result;
590 }
591
592
593 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
594 if (JvmtiExport::can_post_on_exceptions()) {
595 vframeStream vfst(thread, true);
596 methodHandle method = methodHandle(thread, vfst.method());
597 address bcp = method()->bcp_from(vfst.bci());
598 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
599 }
600 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
601 }
602
603 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
604 Handle h_exception = Exceptions::new_exception(thread, name, message);
605 throw_and_post_jvmti_exception(thread, h_exception);
606 }
607
608 // The interpreter code to call this tracing function is only
609 // called/generated when UL is on for redefine, class and has the right level
610 // and tags. Since obsolete methods are never compiled, we don't have
611 // to modify the compilers to generate calls to this function.
612 //
613 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
614 JavaThread* thread, Method* method))
615 if (method->is_obsolete()) {
616 // We are calling an obsolete method, but this is not necessarily
617 // an error. Our method could have been redefined just after we
618 // fetched the Method* from the constant pool.
619 ResourceMark rm;
620 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
621 }
622 return 0;
623 JRT_END
624
625 // ret_pc points into caller; we are returning caller's exception handler
626 // for given exception
627 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception,
628 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
629 assert(cm != NULL, "must exist");
630 ResourceMark rm;
631
632 #if INCLUDE_JVMCI
633 if (cm->is_compiled_by_jvmci()) {
634 // lookup exception handler for this pc
635 int catch_pco = ret_pc - cm->code_begin();
636 ExceptionHandlerTable table(cm);
637 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
638 if (t != NULL) {
639 return cm->code_begin() + t->pco();
640 } else {
641 // there is no exception handler for this pc => deoptimize
642 cm->make_not_entrant();
643
644 // Use Deoptimization::deoptimize for all of its side-effects:
645 // revoking biases of monitors, gathering traps statistics, logging...
646 // it also patches the return pc but we do not care about that
647 // since we return a continuation to the deopt_blob below.
648 JavaThread* thread = JavaThread::current();
649 RegisterMap reg_map(thread, UseBiasedLocking);
650 frame runtime_frame = thread->last_frame();
651 frame caller_frame = runtime_frame.sender(®_map);
652 Deoptimization::deoptimize(thread, caller_frame, ®_map, Deoptimization::Reason_not_compiled_exception_handler);
653
654 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
655 }
656 }
657 #endif // INCLUDE_JVMCI
658
659 nmethod* nm = cm->as_nmethod();
660 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
661 // determine handler bci, if any
662 EXCEPTION_MARK;
663
664 int handler_bci = -1;
665 int scope_depth = 0;
666 if (!force_unwind) {
667 int bci = sd->bci();
668 bool recursive_exception = false;
669 do {
670 bool skip_scope_increment = false;
671 // exception handler lookup
672 Klass* ek = exception->klass();
673 methodHandle mh(THREAD, sd->method());
674 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
675 if (HAS_PENDING_EXCEPTION) {
676 recursive_exception = true;
677 // We threw an exception while trying to find the exception handler.
678 // Transfer the new exception to the exception handle which will
679 // be set into thread local storage, and do another lookup for an
680 // exception handler for this exception, this time starting at the
681 // BCI of the exception handler which caused the exception to be
682 // thrown (bugs 4307310 and 4546590). Set "exception" reference
683 // argument to ensure that the correct exception is thrown (4870175).
684 recursive_exception_occurred = true;
685 exception = Handle(THREAD, PENDING_EXCEPTION);
686 CLEAR_PENDING_EXCEPTION;
687 if (handler_bci >= 0) {
688 bci = handler_bci;
689 handler_bci = -1;
690 skip_scope_increment = true;
691 }
692 }
693 else {
694 recursive_exception = false;
695 }
696 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
697 sd = sd->sender();
698 if (sd != NULL) {
699 bci = sd->bci();
700 }
701 ++scope_depth;
702 }
703 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
704 }
705
706 // found handling method => lookup exception handler
707 int catch_pco = ret_pc - nm->code_begin();
708
709 ExceptionHandlerTable table(nm);
710 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
711 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
712 // Allow abbreviated catch tables. The idea is to allow a method
713 // to materialize its exceptions without committing to the exact
714 // routing of exceptions. In particular this is needed for adding
715 // a synthetic handler to unlock monitors when inlining
716 // synchronized methods since the unlock path isn't represented in
717 // the bytecodes.
718 t = table.entry_for(catch_pco, -1, 0);
719 }
720
721 #ifdef COMPILER1
722 if (t == NULL && nm->is_compiled_by_c1()) {
723 assert(nm->unwind_handler_begin() != NULL, "");
724 return nm->unwind_handler_begin();
725 }
726 #endif
727
728 if (t == NULL) {
729 ttyLocker ttyl;
730 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci);
731 tty->print_cr(" Exception:");
732 exception->print();
733 tty->cr();
734 tty->print_cr(" Compiled exception table :");
735 table.print();
736 nm->print_code();
737 guarantee(false, "missing exception handler");
738 return NULL;
739 }
740
741 return nm->code_begin() + t->pco();
742 }
743
744 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
745 // These errors occur only at call sites
746 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
747 JRT_END
748
749 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
750 // These errors occur only at call sites
751 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
752 JRT_END
753
754 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
755 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
756 JRT_END
757
758 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
759 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
760 JRT_END
761
762 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
763 // This entry point is effectively only used for NullPointerExceptions which occur at inline
764 // cache sites (when the callee activation is not yet set up) so we are at a call site
765 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
766 JRT_END
767
768 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
769 throw_StackOverflowError_common(thread, false);
770 JRT_END
771
772 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
773 throw_StackOverflowError_common(thread, true);
774 JRT_END
775
776 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) {
777 // We avoid using the normal exception construction in this case because
778 // it performs an upcall to Java, and we're already out of stack space.
779 Thread* THREAD = thread;
780 Klass* k = SystemDictionary::StackOverflowError_klass();
781 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
782 if (delayed) {
783 java_lang_Throwable::set_message(exception_oop,
784 Universe::delayed_stack_overflow_error_message());
785 }
786 Handle exception (thread, exception_oop);
787 if (StackTraceInThrowable) {
788 java_lang_Throwable::fill_in_stack_trace(exception);
789 }
790 // Increment counter for hs_err file reporting
791 Atomic::inc(&Exceptions::_stack_overflow_errors);
792 throw_and_post_jvmti_exception(thread, exception);
793 }
794
795 #if INCLUDE_JVMCI
796 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason) {
797 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason");
798 thread->set_jvmci_implicit_exception_pc(pc);
799 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret));
800 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
801 }
802 #endif // INCLUDE_JVMCI
803
804 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
805 address pc,
806 SharedRuntime::ImplicitExceptionKind exception_kind)
807 {
808 address target_pc = NULL;
809
810 if (Interpreter::contains(pc)) {
811 #ifdef CC_INTERP
812 // C++ interpreter doesn't throw implicit exceptions
813 ShouldNotReachHere();
814 #else
815 switch (exception_kind) {
816 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
817 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
818 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
819 default: ShouldNotReachHere();
820 }
821 #endif // !CC_INTERP
822 } else {
823 switch (exception_kind) {
824 case STACK_OVERFLOW: {
825 // Stack overflow only occurs upon frame setup; the callee is
826 // going to be unwound. Dispatch to a shared runtime stub
827 // which will cause the StackOverflowError to be fabricated
828 // and processed.
829 // Stack overflow should never occur during deoptimization:
830 // the compiled method bangs the stack by as much as the
831 // interpreter would need in case of a deoptimization. The
832 // deoptimization blob and uncommon trap blob bang the stack
833 // in a debug VM to verify the correctness of the compiled
834 // method stack banging.
835 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
836 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
837 return StubRoutines::throw_StackOverflowError_entry();
838 }
839
840 case IMPLICIT_NULL: {
841 if (VtableStubs::contains(pc)) {
842 // We haven't yet entered the callee frame. Fabricate an
843 // exception and begin dispatching it in the caller. Since
844 // the caller was at a call site, it's safe to destroy all
845 // caller-saved registers, as these entry points do.
846 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
847
848 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
849 if (vt_stub == NULL) return NULL;
850
851 if (vt_stub->is_abstract_method_error(pc)) {
852 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
853 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
854 return StubRoutines::throw_AbstractMethodError_entry();
855 } else {
856 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
857 return StubRoutines::throw_NullPointerException_at_call_entry();
858 }
859 } else {
860 CodeBlob* cb = CodeCache::find_blob(pc);
861
862 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
863 if (cb == NULL) return NULL;
864
865 // Exception happened in CodeCache. Must be either:
866 // 1. Inline-cache check in C2I handler blob,
867 // 2. Inline-cache check in nmethod, or
868 // 3. Implicit null exception in nmethod
869
870 if (!cb->is_compiled()) {
871 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
872 if (!is_in_blob) {
873 // Allow normal crash reporting to handle this
874 return NULL;
875 }
876 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
877 // There is no handler here, so we will simply unwind.
878 return StubRoutines::throw_NullPointerException_at_call_entry();
879 }
880
881 // Otherwise, it's a compiled method. Consult its exception handlers.
882 CompiledMethod* cm = (CompiledMethod*)cb;
883 if (cm->inlinecache_check_contains(pc)) {
884 // exception happened inside inline-cache check code
885 // => the nmethod is not yet active (i.e., the frame
886 // is not set up yet) => use return address pushed by
887 // caller => don't push another return address
888 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
889 return StubRoutines::throw_NullPointerException_at_call_entry();
890 }
891
892 if (cm->method()->is_method_handle_intrinsic()) {
893 // exception happened inside MH dispatch code, similar to a vtable stub
894 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
895 return StubRoutines::throw_NullPointerException_at_call_entry();
896 }
897
898 #ifndef PRODUCT
899 _implicit_null_throws++;
900 #endif
901 #if INCLUDE_JVMCI
902 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) {
903 // If there's no PcDesc then we'll die way down inside of
904 // deopt instead of just getting normal error reporting,
905 // so only go there if it will succeed.
906 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_null_check);
907 } else {
908 #endif // INCLUDE_JVMCI
909 assert (cm->is_nmethod(), "Expect nmethod");
910 target_pc = ((nmethod*)cm)->continuation_for_implicit_exception(pc);
911 #if INCLUDE_JVMCI
912 }
913 #endif // INCLUDE_JVMCI
914 // If there's an unexpected fault, target_pc might be NULL,
915 // in which case we want to fall through into the normal
916 // error handling code.
917 }
918
919 break; // fall through
920 }
921
922
923 case IMPLICIT_DIVIDE_BY_ZERO: {
924 CompiledMethod* cm = CodeCache::find_compiled(pc);
925 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions");
926 #ifndef PRODUCT
927 _implicit_div0_throws++;
928 #endif
929 #if INCLUDE_JVMCI
930 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) {
931 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_div0_check);
932 } else {
933 #endif // INCLUDE_JVMCI
934 target_pc = cm->continuation_for_implicit_exception(pc);
935 #if INCLUDE_JVMCI
936 }
937 #endif // INCLUDE_JVMCI
938 // If there's an unexpected fault, target_pc might be NULL,
939 // in which case we want to fall through into the normal
940 // error handling code.
941 break; // fall through
942 }
943
944 default: ShouldNotReachHere();
945 }
946
947 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
948
949 if (exception_kind == IMPLICIT_NULL) {
950 #ifndef PRODUCT
951 // for AbortVMOnException flag
952 Exceptions::debug_check_abort("java.lang.NullPointerException");
953 #endif //PRODUCT
954 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
955 } else {
956 #ifndef PRODUCT
957 // for AbortVMOnException flag
958 Exceptions::debug_check_abort("java.lang.ArithmeticException");
959 #endif //PRODUCT
960 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
961 }
962 return target_pc;
963 }
964
965 ShouldNotReachHere();
966 return NULL;
967 }
968
969
970 /**
971 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
972 * installed in the native function entry of all native Java methods before
973 * they get linked to their actual native methods.
974 *
975 * \note
976 * This method actually never gets called! The reason is because
977 * the interpreter's native entries call NativeLookup::lookup() which
978 * throws the exception when the lookup fails. The exception is then
979 * caught and forwarded on the return from NativeLookup::lookup() call
980 * before the call to the native function. This might change in the future.
981 */
982 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
983 {
984 // We return a bad value here to make sure that the exception is
985 // forwarded before we look at the return value.
986 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
987 }
988 JNI_END
989
990 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
991 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
992 }
993
994 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
995 #if INCLUDE_JVMCI
996 if (!obj->klass()->has_finalizer()) {
997 return;
998 }
999 #endif // INCLUDE_JVMCI
1000 assert(obj->is_oop(), "must be a valid oop");
1001 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1002 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1003 JRT_END
1004
1005
1006 jlong SharedRuntime::get_java_tid(Thread* thread) {
1007 if (thread != NULL) {
1008 if (thread->is_Java_thread()) {
1009 oop obj = ((JavaThread*)thread)->threadObj();
1010 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
1011 }
1012 }
1013 return 0;
1014 }
1015
1016 /**
1017 * This function ought to be a void function, but cannot be because
1018 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1019 * 6254741. Once that is fixed we can remove the dummy return value.
1020 */
1021 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
1022 return dtrace_object_alloc_base(Thread::current(), o, size);
1023 }
1024
1025 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
1026 assert(DTraceAllocProbes, "wrong call");
1027 Klass* klass = o->klass();
1028 Symbol* name = klass->name();
1029 HOTSPOT_OBJECT_ALLOC(
1030 get_java_tid(thread),
1031 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1032 return 0;
1033 }
1034
1035 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1036 JavaThread* thread, Method* method))
1037 assert(DTraceMethodProbes, "wrong call");
1038 Symbol* kname = method->klass_name();
1039 Symbol* name = method->name();
1040 Symbol* sig = method->signature();
1041 HOTSPOT_METHOD_ENTRY(
1042 get_java_tid(thread),
1043 (char *) kname->bytes(), kname->utf8_length(),
1044 (char *) name->bytes(), name->utf8_length(),
1045 (char *) sig->bytes(), sig->utf8_length());
1046 return 0;
1047 JRT_END
1048
1049 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1050 JavaThread* thread, Method* method))
1051 assert(DTraceMethodProbes, "wrong call");
1052 Symbol* kname = method->klass_name();
1053 Symbol* name = method->name();
1054 Symbol* sig = method->signature();
1055 HOTSPOT_METHOD_RETURN(
1056 get_java_tid(thread),
1057 (char *) kname->bytes(), kname->utf8_length(),
1058 (char *) name->bytes(), name->utf8_length(),
1059 (char *) sig->bytes(), sig->utf8_length());
1060 return 0;
1061 JRT_END
1062
1063
1064 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1065 // for a call current in progress, i.e., arguments has been pushed on stack
1066 // put callee has not been invoked yet. Used by: resolve virtual/static,
1067 // vtable updates, etc. Caller frame must be compiled.
1068 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1069 ResourceMark rm(THREAD);
1070
1071 // last java frame on stack (which includes native call frames)
1072 vframeStream vfst(thread, true); // Do not skip and javaCalls
1073
1074 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD);
1075 }
1076
1077 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) {
1078 CompiledMethod* caller = vfst.nm();
1079
1080 nmethodLocker caller_lock(caller);
1081
1082 address pc = vfst.frame_pc();
1083 { // Get call instruction under lock because another thread may be busy patching it.
1084 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1085 return caller->attached_method_before_pc(pc);
1086 }
1087 return NULL;
1088 }
1089
1090 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1091 // for a call current in progress, i.e., arguments has been pushed on stack
1092 // but callee has not been invoked yet. Caller frame must be compiled.
1093 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1094 vframeStream& vfst,
1095 Bytecodes::Code& bc,
1096 CallInfo& callinfo, TRAPS) {
1097 Handle receiver;
1098 Handle nullHandle; //create a handy null handle for exception returns
1099
1100 assert(!vfst.at_end(), "Java frame must exist");
1101
1102 // Find caller and bci from vframe
1103 methodHandle caller(THREAD, vfst.method());
1104 int bci = vfst.bci();
1105
1106 Bytecode_invoke bytecode(caller, bci);
1107 int bytecode_index = bytecode.index();
1108
1109 methodHandle attached_method = extract_attached_method(vfst);
1110 if (attached_method.not_null()) {
1111 methodHandle callee = bytecode.static_target(CHECK_NH);
1112 vmIntrinsics::ID id = callee->intrinsic_id();
1113 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1114 // it attaches statically resolved method to the call site.
1115 if (MethodHandles::is_signature_polymorphic(id) &&
1116 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1117 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1118
1119 // Adjust invocation mode according to the attached method.
1120 switch (bc) {
1121 case Bytecodes::_invokeinterface:
1122 if (!attached_method->method_holder()->is_interface()) {
1123 bc = Bytecodes::_invokevirtual;
1124 }
1125 break;
1126 case Bytecodes::_invokehandle:
1127 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1128 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1129 : Bytecodes::_invokevirtual;
1130 }
1131 break;
1132 }
1133 }
1134 } else {
1135 bc = bytecode.invoke_code();
1136 }
1137
1138 bool has_receiver = bc != Bytecodes::_invokestatic &&
1139 bc != Bytecodes::_invokedynamic &&
1140 bc != Bytecodes::_invokehandle;
1141
1142 // Find receiver for non-static call
1143 if (has_receiver) {
1144 // This register map must be update since we need to find the receiver for
1145 // compiled frames. The receiver might be in a register.
1146 RegisterMap reg_map2(thread);
1147 frame stubFrame = thread->last_frame();
1148 // Caller-frame is a compiled frame
1149 frame callerFrame = stubFrame.sender(®_map2);
1150
1151 if (attached_method.is_null()) {
1152 methodHandle callee = bytecode.static_target(CHECK_NH);
1153 if (callee.is_null()) {
1154 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1155 }
1156 }
1157
1158 // Retrieve from a compiled argument list
1159 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1160
1161 if (receiver.is_null()) {
1162 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1163 }
1164 }
1165
1166 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1167
1168 // Resolve method
1169 if (attached_method.not_null()) {
1170 // Parameterized by attached method.
1171 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1172 } else {
1173 // Parameterized by bytecode.
1174 constantPoolHandle constants(THREAD, caller->constants());
1175 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1176 }
1177
1178 #ifdef ASSERT
1179 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1180 if (has_receiver) {
1181 assert(receiver.not_null(), "should have thrown exception");
1182 Klass* receiver_klass = receiver->klass();
1183 Klass* rk = NULL;
1184 if (attached_method.not_null()) {
1185 // In case there's resolved method attached, use its holder during the check.
1186 rk = attached_method->method_holder();
1187 } else {
1188 // Klass is already loaded.
1189 constantPoolHandle constants(THREAD, caller->constants());
1190 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1191 }
1192 Klass* static_receiver_klass = rk;
1193 methodHandle callee = callinfo.selected_method();
1194 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1195 "actual receiver must be subclass of static receiver klass");
1196 if (receiver_klass->is_instance_klass()) {
1197 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1198 tty->print_cr("ERROR: Klass not yet initialized!!");
1199 receiver_klass->print();
1200 }
1201 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1202 }
1203 }
1204 #endif
1205
1206 return receiver;
1207 }
1208
1209 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1210 ResourceMark rm(THREAD);
1211 // We need first to check if any Java activations (compiled, interpreted)
1212 // exist on the stack since last JavaCall. If not, we need
1213 // to get the target method from the JavaCall wrapper.
1214 vframeStream vfst(thread, true); // Do not skip any javaCalls
1215 methodHandle callee_method;
1216 if (vfst.at_end()) {
1217 // No Java frames were found on stack since we did the JavaCall.
1218 // Hence the stack can only contain an entry_frame. We need to
1219 // find the target method from the stub frame.
1220 RegisterMap reg_map(thread, false);
1221 frame fr = thread->last_frame();
1222 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1223 fr = fr.sender(®_map);
1224 assert(fr.is_entry_frame(), "must be");
1225 // fr is now pointing to the entry frame.
1226 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1227 } else {
1228 Bytecodes::Code bc;
1229 CallInfo callinfo;
1230 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1231 callee_method = callinfo.selected_method();
1232 }
1233 assert(callee_method()->is_method(), "must be");
1234 return callee_method;
1235 }
1236
1237 // Resolves a call.
1238 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1239 bool is_virtual,
1240 bool is_optimized, TRAPS) {
1241 methodHandle callee_method;
1242 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1243 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1244 int retry_count = 0;
1245 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1246 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1247 // If has a pending exception then there is no need to re-try to
1248 // resolve this method.
1249 // If the method has been redefined, we need to try again.
1250 // Hack: we have no way to update the vtables of arrays, so don't
1251 // require that java.lang.Object has been updated.
1252
1253 // It is very unlikely that method is redefined more than 100 times
1254 // in the middle of resolve. If it is looping here more than 100 times
1255 // means then there could be a bug here.
1256 guarantee((retry_count++ < 100),
1257 "Could not resolve to latest version of redefined method");
1258 // method is redefined in the middle of resolve so re-try.
1259 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1260 }
1261 }
1262 return callee_method;
1263 }
1264
1265 // Resolves a call. The compilers generate code for calls that go here
1266 // and are patched with the real destination of the call.
1267 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1268 bool is_virtual,
1269 bool is_optimized, TRAPS) {
1270
1271 ResourceMark rm(thread);
1272 RegisterMap cbl_map(thread, false);
1273 frame caller_frame = thread->last_frame().sender(&cbl_map);
1274
1275 CodeBlob* caller_cb = caller_frame.cb();
1276 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1277 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1278
1279 // make sure caller is not getting deoptimized
1280 // and removed before we are done with it.
1281 // CLEANUP - with lazy deopt shouldn't need this lock
1282 nmethodLocker caller_lock(caller_nm);
1283
1284 // determine call info & receiver
1285 // note: a) receiver is NULL for static calls
1286 // b) an exception is thrown if receiver is NULL for non-static calls
1287 CallInfo call_info;
1288 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1289 Handle receiver = find_callee_info(thread, invoke_code,
1290 call_info, CHECK_(methodHandle()));
1291 methodHandle callee_method = call_info.selected_method();
1292
1293 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1294 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1295 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1296 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1297 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1298
1299 assert(caller_nm->is_alive(), "It should be alive");
1300
1301 #ifndef PRODUCT
1302 // tracing/debugging/statistics
1303 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1304 (is_virtual) ? (&_resolve_virtual_ctr) :
1305 (&_resolve_static_ctr);
1306 Atomic::inc(addr);
1307
1308 if (TraceCallFixup) {
1309 ResourceMark rm(thread);
1310 tty->print("resolving %s%s (%s) call to",
1311 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1312 Bytecodes::name(invoke_code));
1313 callee_method->print_short_name(tty);
1314 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1315 p2i(caller_frame.pc()), p2i(callee_method->code()));
1316 }
1317 #endif
1318
1319 // JSR 292 key invariant:
1320 // If the resolved method is a MethodHandle invoke target, the call
1321 // site must be a MethodHandle call site, because the lambda form might tail-call
1322 // leaving the stack in a state unknown to either caller or callee
1323 // TODO detune for now but we might need it again
1324 // assert(!callee_method->is_compiled_lambda_form() ||
1325 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1326
1327 // Compute entry points. This might require generation of C2I converter
1328 // frames, so we cannot be holding any locks here. Furthermore, the
1329 // computation of the entry points is independent of patching the call. We
1330 // always return the entry-point, but we only patch the stub if the call has
1331 // not been deoptimized. Return values: For a virtual call this is an
1332 // (cached_oop, destination address) pair. For a static call/optimized
1333 // virtual this is just a destination address.
1334
1335 StaticCallInfo static_call_info;
1336 CompiledICInfo virtual_call_info;
1337
1338 // Make sure the callee nmethod does not get deoptimized and removed before
1339 // we are done patching the code.
1340 CompiledMethod* callee = callee_method->code();
1341
1342 if (callee != NULL) {
1343 assert(callee->is_compiled(), "must be nmethod for patching");
1344 }
1345
1346 if (callee != NULL && !callee->is_in_use()) {
1347 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1348 callee = NULL;
1349 }
1350 nmethodLocker nl_callee(callee);
1351 #ifdef ASSERT
1352 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1353 #endif
1354
1355 bool is_nmethod = caller_nm->is_nmethod();
1356
1357 if (is_virtual) {
1358 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1359 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1360 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass();
1361 CompiledIC::compute_monomorphic_entry(callee_method, klass,
1362 is_optimized, static_bound, is_nmethod, virtual_call_info,
1363 CHECK_(methodHandle()));
1364 } else {
1365 // static call
1366 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info);
1367 }
1368
1369 // grab lock, check for deoptimization and potentially patch caller
1370 {
1371 MutexLocker ml_patch(CompiledIC_lock);
1372
1373 // Lock blocks for safepoint during which both nmethods can change state.
1374
1375 // Now that we are ready to patch if the Method* was redefined then
1376 // don't update call site and let the caller retry.
1377 // Don't update call site if callee nmethod was unloaded or deoptimized.
1378 // Don't update call site if callee nmethod was replaced by an other nmethod
1379 // which may happen when multiply alive nmethod (tiered compilation)
1380 // will be supported.
1381 if (!callee_method->is_old() &&
1382 (callee == NULL || callee->is_in_use() && (callee_method->code() == callee))) {
1383 #ifdef ASSERT
1384 // We must not try to patch to jump to an already unloaded method.
1385 if (dest_entry_point != 0) {
1386 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1387 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee),
1388 "should not call unloaded nmethod");
1389 }
1390 #endif
1391 if (is_virtual) {
1392 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1393 if (inline_cache->is_clean()) {
1394 inline_cache->set_to_monomorphic(virtual_call_info);
1395 }
1396 } else {
1397 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc());
1398 if (ssc->is_clean()) ssc->set(static_call_info);
1399 }
1400 }
1401
1402 } // unlock CompiledIC_lock
1403
1404 return callee_method;
1405 }
1406
1407
1408 // Inline caches exist only in compiled code
1409 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1410 #ifdef ASSERT
1411 RegisterMap reg_map(thread, false);
1412 frame stub_frame = thread->last_frame();
1413 assert(stub_frame.is_runtime_frame(), "sanity check");
1414 frame caller_frame = stub_frame.sender(®_map);
1415 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1416 #endif /* ASSERT */
1417
1418 methodHandle callee_method;
1419 JRT_BLOCK
1420 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1421 // Return Method* through TLS
1422 thread->set_vm_result_2(callee_method());
1423 JRT_BLOCK_END
1424 // return compiled code entry point after potential safepoints
1425 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1426 return callee_method->verified_code_entry();
1427 JRT_END
1428
1429
1430 // Handle call site that has been made non-entrant
1431 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1432 // 6243940 We might end up in here if the callee is deoptimized
1433 // as we race to call it. We don't want to take a safepoint if
1434 // the caller was interpreted because the caller frame will look
1435 // interpreted to the stack walkers and arguments are now
1436 // "compiled" so it is much better to make this transition
1437 // invisible to the stack walking code. The i2c path will
1438 // place the callee method in the callee_target. It is stashed
1439 // there because if we try and find the callee by normal means a
1440 // safepoint is possible and have trouble gc'ing the compiled args.
1441 RegisterMap reg_map(thread, false);
1442 frame stub_frame = thread->last_frame();
1443 assert(stub_frame.is_runtime_frame(), "sanity check");
1444 frame caller_frame = stub_frame.sender(®_map);
1445
1446 if (caller_frame.is_interpreted_frame() ||
1447 caller_frame.is_entry_frame()) {
1448 Method* callee = thread->callee_target();
1449 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1450 thread->set_vm_result_2(callee);
1451 thread->set_callee_target(NULL);
1452 return callee->get_c2i_entry();
1453 }
1454
1455 // Must be compiled to compiled path which is safe to stackwalk
1456 methodHandle callee_method;
1457 JRT_BLOCK
1458 // Force resolving of caller (if we called from compiled frame)
1459 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1460 thread->set_vm_result_2(callee_method());
1461 JRT_BLOCK_END
1462 // return compiled code entry point after potential safepoints
1463 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1464 return callee_method->verified_code_entry();
1465 JRT_END
1466
1467 // Handle abstract method call
1468 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1469 return StubRoutines::throw_AbstractMethodError_entry();
1470 JRT_END
1471
1472
1473 // resolve a static call and patch code
1474 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1475 methodHandle callee_method;
1476 JRT_BLOCK
1477 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1478 thread->set_vm_result_2(callee_method());
1479 JRT_BLOCK_END
1480 // return compiled code entry point after potential safepoints
1481 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1482 return callee_method->verified_code_entry();
1483 JRT_END
1484
1485
1486 // resolve virtual call and update inline cache to monomorphic
1487 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1488 methodHandle callee_method;
1489 JRT_BLOCK
1490 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1491 thread->set_vm_result_2(callee_method());
1492 JRT_BLOCK_END
1493 // return compiled code entry point after potential safepoints
1494 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1495 return callee_method->verified_code_entry();
1496 JRT_END
1497
1498
1499 // Resolve a virtual call that can be statically bound (e.g., always
1500 // monomorphic, so it has no inline cache). Patch code to resolved target.
1501 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1502 methodHandle callee_method;
1503 JRT_BLOCK
1504 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1505 thread->set_vm_result_2(callee_method());
1506 JRT_BLOCK_END
1507 // return compiled code entry point after potential safepoints
1508 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1509 return callee_method->verified_code_entry();
1510 JRT_END
1511
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 Klass* receiver_klass = receiver()->klass();
1623 inline_cache->compute_monomorphic_entry(callee_method,
1624 receiver_klass,
1625 inline_cache->is_optimized(),
1626 false, caller_nm->is_nmethod(),
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 call_addr = caller_nm->call_instruction_address(pc);
1696 }
1697 // Make sure nmethod doesn't get deoptimized and removed until
1698 // this is done with it.
1699 // CLEANUP - with lazy deopt shouldn't need this lock
1700 nmethodLocker nmlock(caller_nm);
1701
1702 if (call_addr != NULL) {
1703 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1704 int ret = iter.next(); // Get item
1705 if (ret) {
1706 assert(iter.addr() == call_addr, "must find call");
1707 if (iter.type() == relocInfo::static_call_type) {
1708 is_static_call = true;
1709 } else {
1710 assert(iter.type() == relocInfo::virtual_call_type ||
1711 iter.type() == relocInfo::opt_virtual_call_type
1712 , "unexpected relocInfo. type");
1713 }
1714 } else {
1715 assert(!UseInlineCaches, "relocation info. must exist for this address");
1716 }
1717
1718 // Cleaning the inline cache will force a new resolve. This is more robust
1719 // than directly setting it to the new destination, since resolving of calls
1720 // is always done through the same code path. (experience shows that it
1721 // leads to very hard to track down bugs, if an inline cache gets updated
1722 // to a wrong method). It should not be performance critical, since the
1723 // resolve is only done once.
1724
1725 bool is_nmethod = caller_nm->is_nmethod();
1726 MutexLocker ml(CompiledIC_lock);
1727 if (is_static_call) {
1728 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr);
1729 ssc->set_to_clean();
1730 } else {
1731 // compiled, dispatched call (which used to call an interpreted method)
1732 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1733 inline_cache->set_to_clean();
1734 }
1735 }
1736 }
1737
1738 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1739
1740
1741 #ifndef PRODUCT
1742 Atomic::inc(&_wrong_method_ctr);
1743
1744 if (TraceCallFixup) {
1745 ResourceMark rm(thread);
1746 tty->print("handle_wrong_method reresolving call to");
1747 callee_method->print_short_name(tty);
1748 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1749 }
1750 #endif
1751
1752 return callee_method;
1753 }
1754
1755 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1756 // The faulting unsafe accesses should be changed to throw the error
1757 // synchronously instead. Meanwhile the faulting instruction will be
1758 // skipped over (effectively turning it into a no-op) and an
1759 // asynchronous exception will be raised which the thread will
1760 // handle at a later point. If the instruction is a load it will
1761 // return garbage.
1762
1763 // Request an async exception.
1764 thread->set_pending_unsafe_access_error();
1765
1766 // Return address of next instruction to execute.
1767 return next_pc;
1768 }
1769
1770 #ifdef ASSERT
1771 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1772 const BasicType* sig_bt,
1773 const VMRegPair* regs) {
1774 ResourceMark rm;
1775 const int total_args_passed = method->size_of_parameters();
1776 const VMRegPair* regs_with_member_name = regs;
1777 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1778
1779 const int member_arg_pos = total_args_passed - 1;
1780 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1781 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1782
1783 const bool is_outgoing = method->is_method_handle_intrinsic();
1784 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1785
1786 for (int i = 0; i < member_arg_pos; i++) {
1787 VMReg a = regs_with_member_name[i].first();
1788 VMReg b = regs_without_member_name[i].first();
1789 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value());
1790 }
1791 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1792 }
1793 #endif
1794
1795 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) {
1796 if (destination != entry_point) {
1797 CodeBlob* callee = CodeCache::find_blob(destination);
1798 // callee == cb seems weird. It means calling interpreter thru stub.
1799 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) {
1800 // static call or optimized virtual
1801 if (TraceCallFixup) {
1802 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1803 moop->print_short_name(tty);
1804 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1805 }
1806 return true;
1807 } else {
1808 if (TraceCallFixup) {
1809 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1810 moop->print_short_name(tty);
1811 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1812 }
1813 // assert is too strong could also be resolve destinations.
1814 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1815 }
1816 } else {
1817 if (TraceCallFixup) {
1818 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1819 moop->print_short_name(tty);
1820 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1821 }
1822 }
1823 return false;
1824 }
1825
1826 // ---------------------------------------------------------------------------
1827 // We are calling the interpreter via a c2i. Normally this would mean that
1828 // we were called by a compiled method. However we could have lost a race
1829 // where we went int -> i2c -> c2i and so the caller could in fact be
1830 // interpreted. If the caller is compiled we attempt to patch the caller
1831 // so he no longer calls into the interpreter.
1832 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1833 Method* moop(method);
1834
1835 address entry_point = moop->from_compiled_entry_no_trampoline();
1836
1837 // It's possible that deoptimization can occur at a call site which hasn't
1838 // been resolved yet, in which case this function will be called from
1839 // an nmethod that has been patched for deopt and we can ignore the
1840 // request for a fixup.
1841 // Also it is possible that we lost a race in that from_compiled_entry
1842 // is now back to the i2c in that case we don't need to patch and if
1843 // we did we'd leap into space because the callsite needs to use
1844 // "to interpreter" stub in order to load up the Method*. Don't
1845 // ask me how I know this...
1846
1847 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1848 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) {
1849 return;
1850 }
1851
1852 // The check above makes sure this is a nmethod.
1853 CompiledMethod* nm = cb->as_compiled_method_or_null();
1854 assert(nm, "must be");
1855
1856 // Get the return PC for the passed caller PC.
1857 address return_pc = caller_pc + frame::pc_return_offset;
1858
1859 // There is a benign race here. We could be attempting to patch to a compiled
1860 // entry point at the same time the callee is being deoptimized. If that is
1861 // the case then entry_point may in fact point to a c2i and we'd patch the
1862 // call site with the same old data. clear_code will set code() to NULL
1863 // at the end of it. If we happen to see that NULL then we can skip trying
1864 // to patch. If we hit the window where the callee has a c2i in the
1865 // from_compiled_entry and the NULL isn't present yet then we lose the race
1866 // and patch the code with the same old data. Asi es la vida.
1867
1868 if (moop->code() == NULL) return;
1869
1870 if (nm->is_in_use()) {
1871
1872 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1873 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1874 if (NativeCall::is_call_before(return_pc)) {
1875 ResourceMark mark;
1876 NativeCallWrapper* call = nm->call_wrapper_before(return_pc);
1877 //
1878 // bug 6281185. We might get here after resolving a call site to a vanilla
1879 // virtual call. Because the resolvee uses the verified entry it may then
1880 // see compiled code and attempt to patch the site by calling us. This would
1881 // then incorrectly convert the call site to optimized and its downhill from
1882 // there. If you're lucky you'll get the assert in the bugid, if not you've
1883 // just made a call site that could be megamorphic into a monomorphic site
1884 // for the rest of its life! Just another racing bug in the life of
1885 // fixup_callers_callsite ...
1886 //
1887 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1888 iter.next();
1889 assert(iter.has_current(), "must have a reloc at java call site");
1890 relocInfo::relocType typ = iter.reloc()->type();
1891 if (typ != relocInfo::static_call_type &&
1892 typ != relocInfo::opt_virtual_call_type &&
1893 typ != relocInfo::static_stub_type) {
1894 return;
1895 }
1896 address destination = call->destination();
1897 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) {
1898 call->set_destination_mt_safe(entry_point);
1899 }
1900 }
1901 }
1902 IRT_END
1903
1904
1905 // same as JVM_Arraycopy, but called directly from compiled code
1906 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1907 oopDesc* dest, jint dest_pos,
1908 jint length,
1909 JavaThread* thread)) {
1910 #ifndef PRODUCT
1911 _slow_array_copy_ctr++;
1912 #endif
1913 // Check if we have null pointers
1914 if (src == NULL || dest == NULL) {
1915 THROW(vmSymbols::java_lang_NullPointerException());
1916 }
1917 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1918 // even though the copy_array API also performs dynamic checks to ensure
1919 // that src and dest are truly arrays (and are conformable).
1920 // The copy_array mechanism is awkward and could be removed, but
1921 // the compilers don't call this function except as a last resort,
1922 // so it probably doesn't matter.
1923 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1924 (arrayOopDesc*)dest, dest_pos,
1925 length, thread);
1926 }
1927 JRT_END
1928
1929 // The caller of generate_class_cast_message() (or one of its callers)
1930 // must use a ResourceMark in order to correctly free the result.
1931 char* SharedRuntime::generate_class_cast_message(
1932 JavaThread* thread, Klass* caster_klass) {
1933
1934 // Get target class name from the checkcast instruction
1935 vframeStream vfst(thread, true);
1936 assert(!vfst.at_end(), "Java frame must exist");
1937 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1938 Klass* target_klass = vfst.method()->constants()->klass_at(
1939 cc.index(), thread);
1940 return generate_class_cast_message(caster_klass, target_klass);
1941 }
1942
1943 // The caller of class_loader_and_module_name() (or one of its callers)
1944 // must use a ResourceMark in order to correctly free the result.
1945 const char* class_loader_and_module_name(Klass* klass) {
1946 const char* delim = "/";
1947 size_t delim_len = strlen(delim);
1948
1949 const char* fqn = klass->external_name();
1950 // Length of message to return; always include FQN
1951 size_t msglen = strlen(fqn) + 1;
1952
1953 bool has_cl_name = false;
1954 bool has_mod_name = false;
1955 bool has_version = false;
1956
1957 // Use class loader name, if exists and not builtin
1958 const char* class_loader_name = "";
1959 ClassLoaderData* cld = klass->class_loader_data();
1960 assert(cld != NULL, "class_loader_data should not be NULL");
1961 if (!cld->is_builtin_class_loader_data()) {
1962 // If not builtin, look for name
1963 oop loader = klass->class_loader();
1964 if (loader != NULL) {
1965 oop class_loader_name_oop = java_lang_ClassLoader::name(loader);
1966 if (class_loader_name_oop != NULL) {
1967 class_loader_name = java_lang_String::as_utf8_string(class_loader_name_oop);
1968 if (class_loader_name != NULL && class_loader_name[0] != '\0') {
1969 has_cl_name = true;
1970 msglen += strlen(class_loader_name) + delim_len;
1971 }
1972 }
1973 }
1974 }
1975
1976 const char* module_name = "";
1977 const char* version = "";
1978 Klass* bottom_klass = klass->is_objArray_klass() ?
1979 ObjArrayKlass::cast(klass)->bottom_klass() : klass;
1980 if (bottom_klass->is_instance_klass()) {
1981 ModuleEntry* module = InstanceKlass::cast(bottom_klass)->module();
1982 // Use module name, if exists
1983 if (module->is_named()) {
1984 has_mod_name = true;
1985 module_name = module->name()->as_C_string();
1986 msglen += strlen(module_name);
1987 // Use version if exists and is not a jdk module
1988 if (module->is_non_jdk_module() && module->version() != NULL) {
1989 has_version = true;
1990 version = module->version()->as_C_string();
1991 msglen += strlen("@") + strlen(version);
1992 }
1993 }
1994 } else {
1995 // klass is an array of primitives, so its module is java.base
1996 module_name = JAVA_BASE_NAME;
1997 }
1998
1999 if (has_cl_name || has_mod_name) {
2000 msglen += delim_len;
2001 }
2002
2003 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
2004
2005 // Just return the FQN if error in allocating string
2006 if (message == NULL) {
2007 return fqn;
2008 }
2009
2010 jio_snprintf(message, msglen, "%s%s%s%s%s%s%s",
2011 class_loader_name,
2012 (has_cl_name) ? delim : "",
2013 (has_mod_name) ? module_name : "",
2014 (has_version) ? "@" : "",
2015 (has_version) ? version : "",
2016 (has_cl_name || has_mod_name) ? delim : "",
2017 fqn);
2018 return message;
2019 }
2020
2021 char* SharedRuntime::generate_class_cast_message(
2022 Klass* caster_klass, Klass* target_klass) {
2023
2024 const char* caster_name = class_loader_and_module_name(caster_klass);
2025
2026 const char* target_name = class_loader_and_module_name(target_klass);
2027
2028 size_t msglen = strlen(caster_name) + strlen(" cannot be cast to ") + strlen(target_name) + 1;
2029
2030 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
2031 if (message == NULL) {
2032 // Shouldn't happen, but don't cause even more problems if it does
2033 message = const_cast<char*>(caster_klass->external_name());
2034 } else {
2035 jio_snprintf(message,
2036 msglen,
2037 "%s cannot be cast to %s",
2038 caster_name,
2039 target_name);
2040 }
2041 return message;
2042 }
2043
2044 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2045 (void) JavaThread::current()->reguard_stack();
2046 JRT_END
2047
2048
2049 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
2050 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
2051 // Disable ObjectSynchronizer::quick_enter() in default config
2052 // on AARCH64 and ARM until JDK-8153107 is resolved.
2053 if (ARM_ONLY((SyncFlags & 256) != 0 &&)
2054 AARCH64_ONLY((SyncFlags & 256) != 0 &&)
2055 !SafepointSynchronize::is_synchronizing()) {
2056 // Only try quick_enter() if we're not trying to reach a safepoint
2057 // so that the calling thread reaches the safepoint more quickly.
2058 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return;
2059 }
2060 // NO_ASYNC required because an async exception on the state transition destructor
2061 // would leave you with the lock held and it would never be released.
2062 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2063 // and the model is that an exception implies the method failed.
2064 JRT_BLOCK_NO_ASYNC
2065 oop obj(_obj);
2066 if (PrintBiasedLockingStatistics) {
2067 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
2068 }
2069 Handle h_obj(THREAD, obj);
2070 if (UseBiasedLocking) {
2071 // Retry fast entry if bias is revoked to avoid unnecessary inflation
2072 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
2073 } else {
2074 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
2075 }
2076 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2077 JRT_BLOCK_END
2078 JRT_END
2079
2080 // Handles the uncommon cases of monitor unlocking in compiled code
2081 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD))
2082 oop obj(_obj);
2083 assert(JavaThread::current() == THREAD, "invariant");
2084 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
2085 // testing was unable to ever fire the assert that guarded it so I have removed it.
2086 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
2087 #undef MIGHT_HAVE_PENDING
2088 #ifdef MIGHT_HAVE_PENDING
2089 // Save and restore any pending_exception around the exception mark.
2090 // While the slow_exit must not throw an exception, we could come into
2091 // this routine with one set.
2092 oop pending_excep = NULL;
2093 const char* pending_file;
2094 int pending_line;
2095 if (HAS_PENDING_EXCEPTION) {
2096 pending_excep = PENDING_EXCEPTION;
2097 pending_file = THREAD->exception_file();
2098 pending_line = THREAD->exception_line();
2099 CLEAR_PENDING_EXCEPTION;
2100 }
2101 #endif /* MIGHT_HAVE_PENDING */
2102
2103 {
2104 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2105 EXCEPTION_MARK;
2106 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
2107 }
2108
2109 #ifdef MIGHT_HAVE_PENDING
2110 if (pending_excep != NULL) {
2111 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
2112 }
2113 #endif /* MIGHT_HAVE_PENDING */
2114 JRT_END
2115
2116 #ifndef PRODUCT
2117
2118 void SharedRuntime::print_statistics() {
2119 ttyLocker ttyl;
2120 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
2121
2122 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
2123
2124 SharedRuntime::print_ic_miss_histogram();
2125
2126 if (CountRemovableExceptions) {
2127 if (_nof_removable_exceptions > 0) {
2128 Unimplemented(); // this counter is not yet incremented
2129 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
2130 }
2131 }
2132
2133 // Dump the JRT_ENTRY counters
2134 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
2135 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr);
2136 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
2137 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
2138 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
2139 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
2140 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
2141
2142 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr);
2143 tty->print_cr("%5d wrong method", _wrong_method_ctr);
2144 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr);
2145 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr);
2146 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2147
2148 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr);
2149 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr);
2150 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr);
2151 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr);
2152 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr);
2153 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr);
2154 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr);
2155 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr);
2156 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr);
2157 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr);
2158 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr);
2159 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr);
2160 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr);
2161 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr);
2162 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr);
2163 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr);
2164
2165 AdapterHandlerLibrary::print_statistics();
2166
2167 if (xtty != NULL) xtty->tail("statistics");
2168 }
2169
2170 inline double percent(int x, int y) {
2171 return 100.0 * x / MAX2(y, 1);
2172 }
2173
2174 class MethodArityHistogram {
2175 public:
2176 enum { MAX_ARITY = 256 };
2177 private:
2178 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2179 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2180 static int _max_arity; // max. arity seen
2181 static int _max_size; // max. arg size seen
2182
2183 static void add_method_to_histogram(nmethod* nm) {
2184 Method* m = nm->method();
2185 ArgumentCount args(m->signature());
2186 int arity = args.size() + (m->is_static() ? 0 : 1);
2187 int argsize = m->size_of_parameters();
2188 arity = MIN2(arity, MAX_ARITY-1);
2189 argsize = MIN2(argsize, MAX_ARITY-1);
2190 int count = nm->method()->compiled_invocation_count();
2191 _arity_histogram[arity] += count;
2192 _size_histogram[argsize] += count;
2193 _max_arity = MAX2(_max_arity, arity);
2194 _max_size = MAX2(_max_size, argsize);
2195 }
2196
2197 void print_histogram_helper(int n, int* histo, const char* name) {
2198 const int N = MIN2(5, n);
2199 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2200 double sum = 0;
2201 double weighted_sum = 0;
2202 int i;
2203 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2204 double rest = sum;
2205 double percent = sum / 100;
2206 for (i = 0; i <= N; i++) {
2207 rest -= histo[i];
2208 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2209 }
2210 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2211 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2212 }
2213
2214 void print_histogram() {
2215 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2216 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2217 tty->print_cr("\nSame for parameter size (in words):");
2218 print_histogram_helper(_max_size, _size_histogram, "size");
2219 tty->cr();
2220 }
2221
2222 public:
2223 MethodArityHistogram() {
2224 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2225 _max_arity = _max_size = 0;
2226 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2227 CodeCache::nmethods_do(add_method_to_histogram);
2228 print_histogram();
2229 }
2230 };
2231
2232 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2233 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2234 int MethodArityHistogram::_max_arity;
2235 int MethodArityHistogram::_max_size;
2236
2237 void SharedRuntime::print_call_statistics(int comp_total) {
2238 tty->print_cr("Calls from compiled code:");
2239 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2240 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2241 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2242 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2243 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2244 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2245 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2246 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2247 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2248 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2249 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2250 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2251 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2252 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2253 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2254 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2255 tty->cr();
2256 tty->print_cr("Note 1: counter updates are not MT-safe.");
2257 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2258 tty->print_cr(" %% in nested categories are relative to their category");
2259 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2260 tty->cr();
2261
2262 MethodArityHistogram h;
2263 }
2264 #endif
2265
2266
2267 // A simple wrapper class around the calling convention information
2268 // that allows sharing of adapters for the same calling convention.
2269 class AdapterFingerPrint : public CHeapObj<mtCode> {
2270 private:
2271 enum {
2272 _basic_type_bits = 4,
2273 _basic_type_mask = right_n_bits(_basic_type_bits),
2274 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2275 _compact_int_count = 3
2276 };
2277 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2278 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2279
2280 union {
2281 int _compact[_compact_int_count];
2282 int* _fingerprint;
2283 } _value;
2284 int _length; // A negative length indicates the fingerprint is in the compact form,
2285 // Otherwise _value._fingerprint is the array.
2286
2287 // Remap BasicTypes that are handled equivalently by the adapters.
2288 // These are correct for the current system but someday it might be
2289 // necessary to make this mapping platform dependent.
2290 static int adapter_encoding(BasicType in) {
2291 switch (in) {
2292 case T_BOOLEAN:
2293 case T_BYTE:
2294 case T_SHORT:
2295 case T_CHAR:
2296 // There are all promoted to T_INT in the calling convention
2297 return T_INT;
2298
2299 case T_OBJECT:
2300 case T_ARRAY:
2301 // In other words, we assume that any register good enough for
2302 // an int or long is good enough for a managed pointer.
2303 #ifdef _LP64
2304 return T_LONG;
2305 #else
2306 return T_INT;
2307 #endif
2308
2309 case T_INT:
2310 case T_LONG:
2311 case T_FLOAT:
2312 case T_DOUBLE:
2313 case T_VOID:
2314 return in;
2315
2316 default:
2317 ShouldNotReachHere();
2318 return T_CONFLICT;
2319 }
2320 }
2321
2322 public:
2323 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2324 // The fingerprint is based on the BasicType signature encoded
2325 // into an array of ints with eight entries per int.
2326 int* ptr;
2327 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2328 if (len <= _compact_int_count) {
2329 assert(_compact_int_count == 3, "else change next line");
2330 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2331 // Storing the signature encoded as signed chars hits about 98%
2332 // of the time.
2333 _length = -len;
2334 ptr = _value._compact;
2335 } else {
2336 _length = len;
2337 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2338 ptr = _value._fingerprint;
2339 }
2340
2341 // Now pack the BasicTypes with 8 per int
2342 int sig_index = 0;
2343 for (int index = 0; index < len; index++) {
2344 int value = 0;
2345 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2346 int bt = ((sig_index < total_args_passed)
2347 ? adapter_encoding(sig_bt[sig_index++])
2348 : 0);
2349 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2350 value = (value << _basic_type_bits) | bt;
2351 }
2352 ptr[index] = value;
2353 }
2354 }
2355
2356 ~AdapterFingerPrint() {
2357 if (_length > 0) {
2358 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2359 }
2360 }
2361
2362 int value(int index) {
2363 if (_length < 0) {
2364 return _value._compact[index];
2365 }
2366 return _value._fingerprint[index];
2367 }
2368 int length() {
2369 if (_length < 0) return -_length;
2370 return _length;
2371 }
2372
2373 bool is_compact() {
2374 return _length <= 0;
2375 }
2376
2377 unsigned int compute_hash() {
2378 int hash = 0;
2379 for (int i = 0; i < length(); i++) {
2380 int v = value(i);
2381 hash = (hash << 8) ^ v ^ (hash >> 5);
2382 }
2383 return (unsigned int)hash;
2384 }
2385
2386 const char* as_string() {
2387 stringStream st;
2388 st.print("0x");
2389 for (int i = 0; i < length(); i++) {
2390 st.print("%08x", value(i));
2391 }
2392 return st.as_string();
2393 }
2394
2395 bool equals(AdapterFingerPrint* other) {
2396 if (other->_length != _length) {
2397 return false;
2398 }
2399 if (_length < 0) {
2400 assert(_compact_int_count == 3, "else change next line");
2401 return _value._compact[0] == other->_value._compact[0] &&
2402 _value._compact[1] == other->_value._compact[1] &&
2403 _value._compact[2] == other->_value._compact[2];
2404 } else {
2405 for (int i = 0; i < _length; i++) {
2406 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2407 return false;
2408 }
2409 }
2410 }
2411 return true;
2412 }
2413 };
2414
2415
2416 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2417 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2418 friend class AdapterHandlerTableIterator;
2419
2420 private:
2421
2422 #ifndef PRODUCT
2423 static int _lookups; // number of calls to lookup
2424 static int _buckets; // number of buckets checked
2425 static int _equals; // number of buckets checked with matching hash
2426 static int _hits; // number of successful lookups
2427 static int _compact; // number of equals calls with compact signature
2428 #endif
2429
2430 AdapterHandlerEntry* bucket(int i) {
2431 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2432 }
2433
2434 public:
2435 AdapterHandlerTable()
2436 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { }
2437
2438 // Create a new entry suitable for insertion in the table
2439 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2440 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2441 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2442 if (DumpSharedSpaces) {
2443 ((CDSAdapterHandlerEntry*)entry)->init();
2444 }
2445 return entry;
2446 }
2447
2448 // Insert an entry into the table
2449 void add(AdapterHandlerEntry* entry) {
2450 int index = hash_to_index(entry->hash());
2451 add_entry(index, entry);
2452 }
2453
2454 void free_entry(AdapterHandlerEntry* entry) {
2455 entry->deallocate();
2456 BasicHashtable<mtCode>::free_entry(entry);
2457 }
2458
2459 // Find a entry with the same fingerprint if it exists
2460 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2461 NOT_PRODUCT(_lookups++);
2462 AdapterFingerPrint fp(total_args_passed, sig_bt);
2463 unsigned int hash = fp.compute_hash();
2464 int index = hash_to_index(hash);
2465 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2466 NOT_PRODUCT(_buckets++);
2467 if (e->hash() == hash) {
2468 NOT_PRODUCT(_equals++);
2469 if (fp.equals(e->fingerprint())) {
2470 #ifndef PRODUCT
2471 if (fp.is_compact()) _compact++;
2472 _hits++;
2473 #endif
2474 return e;
2475 }
2476 }
2477 }
2478 return NULL;
2479 }
2480
2481 #ifndef PRODUCT
2482 void print_statistics() {
2483 ResourceMark rm;
2484 int longest = 0;
2485 int empty = 0;
2486 int total = 0;
2487 int nonempty = 0;
2488 for (int index = 0; index < table_size(); index++) {
2489 int count = 0;
2490 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2491 count++;
2492 }
2493 if (count != 0) nonempty++;
2494 if (count == 0) empty++;
2495 if (count > longest) longest = count;
2496 total += count;
2497 }
2498 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2499 empty, longest, total, total / (double)nonempty);
2500 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2501 _lookups, _buckets, _equals, _hits, _compact);
2502 }
2503 #endif
2504 };
2505
2506
2507 #ifndef PRODUCT
2508
2509 int AdapterHandlerTable::_lookups;
2510 int AdapterHandlerTable::_buckets;
2511 int AdapterHandlerTable::_equals;
2512 int AdapterHandlerTable::_hits;
2513 int AdapterHandlerTable::_compact;
2514
2515 #endif
2516
2517 class AdapterHandlerTableIterator : public StackObj {
2518 private:
2519 AdapterHandlerTable* _table;
2520 int _index;
2521 AdapterHandlerEntry* _current;
2522
2523 void scan() {
2524 while (_index < _table->table_size()) {
2525 AdapterHandlerEntry* a = _table->bucket(_index);
2526 _index++;
2527 if (a != NULL) {
2528 _current = a;
2529 return;
2530 }
2531 }
2532 }
2533
2534 public:
2535 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2536 scan();
2537 }
2538 bool has_next() {
2539 return _current != NULL;
2540 }
2541 AdapterHandlerEntry* next() {
2542 if (_current != NULL) {
2543 AdapterHandlerEntry* result = _current;
2544 _current = _current->next();
2545 if (_current == NULL) scan();
2546 return result;
2547 } else {
2548 return NULL;
2549 }
2550 }
2551 };
2552
2553
2554 // ---------------------------------------------------------------------------
2555 // Implementation of AdapterHandlerLibrary
2556 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2557 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2558 const int AdapterHandlerLibrary_size = 16*K;
2559 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2560
2561 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2562 // Should be called only when AdapterHandlerLibrary_lock is active.
2563 if (_buffer == NULL) // Initialize lazily
2564 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2565 return _buffer;
2566 }
2567
2568 extern "C" void unexpected_adapter_call() {
2569 ShouldNotCallThis();
2570 }
2571
2572 void AdapterHandlerLibrary::initialize() {
2573 if (_adapters != NULL) return;
2574 _adapters = new AdapterHandlerTable();
2575
2576 // Create a special handler for abstract methods. Abstract methods
2577 // are never compiled so an i2c entry is somewhat meaningless, but
2578 // throw AbstractMethodError just in case.
2579 // Pass wrong_method_abstract for the c2i transitions to return
2580 // AbstractMethodError for invalid invocations.
2581 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2582 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2583 StubRoutines::throw_AbstractMethodError_entry(),
2584 wrong_method_abstract, wrong_method_abstract);
2585 }
2586
2587 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2588 address i2c_entry,
2589 address c2i_entry,
2590 address c2i_unverified_entry) {
2591 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2592 }
2593
2594 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2595 AdapterHandlerEntry* entry = get_adapter0(method);
2596 if (method->is_shared()) {
2597 // See comments around Method::link_method()
2598 MutexLocker mu(AdapterHandlerLibrary_lock);
2599 if (method->adapter() == NULL) {
2600 method->update_adapter_trampoline(entry);
2601 }
2602 address trampoline = method->from_compiled_entry();
2603 if (*(int*)trampoline == 0) {
2604 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size());
2605 MacroAssembler _masm(&buffer);
2606 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry());
2607 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros.");
2608
2609 if (PrintInterpreter) {
2610 Disassembler::decode(buffer.insts_begin(), buffer.insts_end());
2611 }
2612 }
2613 }
2614
2615 return entry;
2616 }
2617
2618 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) {
2619 // Use customized signature handler. Need to lock around updates to
2620 // the AdapterHandlerTable (it is not safe for concurrent readers
2621 // and a single writer: this could be fixed if it becomes a
2622 // problem).
2623
2624 ResourceMark rm;
2625
2626 NOT_PRODUCT(int insts_size);
2627 AdapterBlob* new_adapter = NULL;
2628 AdapterHandlerEntry* entry = NULL;
2629 AdapterFingerPrint* fingerprint = NULL;
2630 {
2631 MutexLocker mu(AdapterHandlerLibrary_lock);
2632 // make sure data structure is initialized
2633 initialize();
2634
2635 if (method->is_abstract()) {
2636 return _abstract_method_handler;
2637 }
2638
2639 // Fill in the signature array, for the calling-convention call.
2640 int total_args_passed = method->size_of_parameters(); // All args on stack
2641
2642 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2643 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2644 int i = 0;
2645 if (!method->is_static()) // Pass in receiver first
2646 sig_bt[i++] = T_OBJECT;
2647 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2648 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2649 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2650 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2651 }
2652 assert(i == total_args_passed, "");
2653
2654 // Lookup method signature's fingerprint
2655 entry = _adapters->lookup(total_args_passed, sig_bt);
2656
2657 #ifdef ASSERT
2658 AdapterHandlerEntry* shared_entry = NULL;
2659 // Start adapter sharing verification only after the VM is booted.
2660 if (VerifyAdapterSharing && (entry != NULL)) {
2661 shared_entry = entry;
2662 entry = NULL;
2663 }
2664 #endif
2665
2666 if (entry != NULL) {
2667 return entry;
2668 }
2669
2670 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2671 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2672
2673 // Make a C heap allocated version of the fingerprint to store in the adapter
2674 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2675
2676 // StubRoutines::code2() is initialized after this function can be called. As a result,
2677 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2678 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2679 // stub that ensure that an I2C stub is called from an interpreter frame.
2680 bool contains_all_checks = StubRoutines::code2() != NULL;
2681
2682 // Create I2C & C2I handlers
2683 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2684 if (buf != NULL) {
2685 CodeBuffer buffer(buf);
2686 short buffer_locs[20];
2687 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2688 sizeof(buffer_locs)/sizeof(relocInfo));
2689
2690 MacroAssembler _masm(&buffer);
2691 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2692 total_args_passed,
2693 comp_args_on_stack,
2694 sig_bt,
2695 regs,
2696 fingerprint);
2697 #ifdef ASSERT
2698 if (VerifyAdapterSharing) {
2699 if (shared_entry != NULL) {
2700 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2701 // Release the one just created and return the original
2702 _adapters->free_entry(entry);
2703 return shared_entry;
2704 } else {
2705 entry->save_code(buf->code_begin(), buffer.insts_size());
2706 }
2707 }
2708 #endif
2709
2710 new_adapter = AdapterBlob::create(&buffer);
2711 NOT_PRODUCT(insts_size = buffer.insts_size());
2712 }
2713 if (new_adapter == NULL) {
2714 // CodeCache is full, disable compilation
2715 // Ought to log this but compile log is only per compile thread
2716 // and we're some non descript Java thread.
2717 return NULL; // Out of CodeCache space
2718 }
2719 entry->relocate(new_adapter->content_begin());
2720 #ifndef PRODUCT
2721 // debugging suppport
2722 if (PrintAdapterHandlers || PrintStubCode) {
2723 ttyLocker ttyl;
2724 entry->print_adapter_on(tty);
2725 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)",
2726 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2727 method->signature()->as_C_string(), fingerprint->as_string(), insts_size);
2728 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
2729 if (Verbose || PrintStubCode) {
2730 address first_pc = entry->base_address();
2731 if (first_pc != NULL) {
2732 Disassembler::decode(first_pc, first_pc + insts_size);
2733 tty->cr();
2734 }
2735 }
2736 }
2737 #endif
2738 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2739 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2740 if (contains_all_checks || !VerifyAdapterCalls) {
2741 _adapters->add(entry);
2742 }
2743 }
2744 // Outside of the lock
2745 if (new_adapter != NULL) {
2746 char blob_id[256];
2747 jio_snprintf(blob_id,
2748 sizeof(blob_id),
2749 "%s(%s)@" PTR_FORMAT,
2750 new_adapter->name(),
2751 fingerprint->as_string(),
2752 new_adapter->content_begin());
2753 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2754
2755 if (JvmtiExport::should_post_dynamic_code_generated()) {
2756 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2757 }
2758 }
2759 return entry;
2760 }
2761
2762 address AdapterHandlerEntry::base_address() {
2763 address base = _i2c_entry;
2764 if (base == NULL) base = _c2i_entry;
2765 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2766 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2767 return base;
2768 }
2769
2770 void AdapterHandlerEntry::relocate(address new_base) {
2771 address old_base = base_address();
2772 assert(old_base != NULL, "");
2773 ptrdiff_t delta = new_base - old_base;
2774 if (_i2c_entry != NULL)
2775 _i2c_entry += delta;
2776 if (_c2i_entry != NULL)
2777 _c2i_entry += delta;
2778 if (_c2i_unverified_entry != NULL)
2779 _c2i_unverified_entry += delta;
2780 assert(base_address() == new_base, "");
2781 }
2782
2783
2784 void AdapterHandlerEntry::deallocate() {
2785 delete _fingerprint;
2786 #ifdef ASSERT
2787 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2788 #endif
2789 }
2790
2791
2792 #ifdef ASSERT
2793 // Capture the code before relocation so that it can be compared
2794 // against other versions. If the code is captured after relocation
2795 // then relative instructions won't be equivalent.
2796 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2797 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2798 _saved_code_length = length;
2799 memcpy(_saved_code, buffer, length);
2800 }
2801
2802
2803 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2804 if (length != _saved_code_length) {
2805 return false;
2806 }
2807
2808 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2809 }
2810 #endif
2811
2812
2813 /**
2814 * Create a native wrapper for this native method. The wrapper converts the
2815 * Java-compiled calling convention to the native convention, handles
2816 * arguments, and transitions to native. On return from the native we transition
2817 * back to java blocking if a safepoint is in progress.
2818 */
2819 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2820 ResourceMark rm;
2821 nmethod* nm = NULL;
2822
2823 assert(method->is_native(), "must be native");
2824 assert(method->is_method_handle_intrinsic() ||
2825 method->has_native_function(), "must have something valid to call!");
2826
2827 {
2828 // Perform the work while holding the lock, but perform any printing outside the lock
2829 MutexLocker mu(AdapterHandlerLibrary_lock);
2830 // See if somebody beat us to it
2831 if (method->code() != NULL) {
2832 return;
2833 }
2834
2835 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2836 assert(compile_id > 0, "Must generate native wrapper");
2837
2838
2839 ResourceMark rm;
2840 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2841 if (buf != NULL) {
2842 CodeBuffer buffer(buf);
2843 double locs_buf[20];
2844 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2845 MacroAssembler _masm(&buffer);
2846
2847 // Fill in the signature array, for the calling-convention call.
2848 const int total_args_passed = method->size_of_parameters();
2849
2850 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2851 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2852 int i=0;
2853 if (!method->is_static()) // Pass in receiver first
2854 sig_bt[i++] = T_OBJECT;
2855 SignatureStream ss(method->signature());
2856 for (; !ss.at_return_type(); ss.next()) {
2857 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2858 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2859 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2860 }
2861 assert(i == total_args_passed, "");
2862 BasicType ret_type = ss.type();
2863
2864 // Now get the compiled-Java layout as input (or output) arguments.
2865 // NOTE: Stubs for compiled entry points of method handle intrinsics
2866 // are just trampolines so the argument registers must be outgoing ones.
2867 const bool is_outgoing = method->is_method_handle_intrinsic();
2868 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2869
2870 // Generate the compiled-to-native wrapper code
2871 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2872
2873 if (nm != NULL) {
2874 method->set_code(method, nm);
2875
2876 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
2877 if (directive->PrintAssemblyOption) {
2878 nm->print_code();
2879 }
2880 DirectivesStack::release(directive);
2881 }
2882 }
2883 } // Unlock AdapterHandlerLibrary_lock
2884
2885
2886 // Install the generated code.
2887 if (nm != NULL) {
2888 const char *msg = method->is_static() ? "(static)" : "";
2889 CompileTask::print_ul(nm, msg);
2890 if (PrintCompilation) {
2891 ttyLocker ttyl;
2892 CompileTask::print(tty, nm, msg);
2893 }
2894 nm->post_compiled_method_load_event();
2895 }
2896 }
2897
2898 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2899 assert(thread == JavaThread::current(), "must be");
2900 // The code is about to enter a JNI lazy critical native method and
2901 // _needs_gc is true, so if this thread is already in a critical
2902 // section then just return, otherwise this thread should block
2903 // until needs_gc has been cleared.
2904 if (thread->in_critical()) {
2905 return;
2906 }
2907 // Lock and unlock a critical section to give the system a chance to block
2908 GCLocker::lock_critical(thread);
2909 GCLocker::unlock_critical(thread);
2910 JRT_END
2911
2912 // -------------------------------------------------------------------------
2913 // Java-Java calling convention
2914 // (what you use when Java calls Java)
2915
2916 //------------------------------name_for_receiver----------------------------------
2917 // For a given signature, return the VMReg for parameter 0.
2918 VMReg SharedRuntime::name_for_receiver() {
2919 VMRegPair regs;
2920 BasicType sig_bt = T_OBJECT;
2921 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2922 // Return argument 0 register. In the LP64 build pointers
2923 // take 2 registers, but the VM wants only the 'main' name.
2924 return regs.first();
2925 }
2926
2927 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2928 // This method is returning a data structure allocating as a
2929 // ResourceObject, so do not put any ResourceMarks in here.
2930 char *s = sig->as_C_string();
2931 int len = (int)strlen(s);
2932 s++; len--; // Skip opening paren
2933
2934 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2935 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2936 int cnt = 0;
2937 if (has_receiver) {
2938 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2939 }
2940
2941 while (*s != ')') { // Find closing right paren
2942 switch (*s++) { // Switch on signature character
2943 case 'B': sig_bt[cnt++] = T_BYTE; break;
2944 case 'C': sig_bt[cnt++] = T_CHAR; break;
2945 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2946 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2947 case 'I': sig_bt[cnt++] = T_INT; break;
2948 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2949 case 'S': sig_bt[cnt++] = T_SHORT; break;
2950 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2951 case 'V': sig_bt[cnt++] = T_VOID; break;
2952 case 'L': // Oop
2953 while (*s++ != ';'); // Skip signature
2954 sig_bt[cnt++] = T_OBJECT;
2955 break;
2956 case '[': { // Array
2957 do { // Skip optional size
2958 while (*s >= '0' && *s <= '9') s++;
2959 } while (*s++ == '['); // Nested arrays?
2960 // Skip element type
2961 if (s[-1] == 'L')
2962 while (*s++ != ';'); // Skip signature
2963 sig_bt[cnt++] = T_ARRAY;
2964 break;
2965 }
2966 default : ShouldNotReachHere();
2967 }
2968 }
2969
2970 if (has_appendix) {
2971 sig_bt[cnt++] = T_OBJECT;
2972 }
2973
2974 assert(cnt < 256, "grow table size");
2975
2976 int comp_args_on_stack;
2977 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2978
2979 // the calling convention doesn't count out_preserve_stack_slots so
2980 // we must add that in to get "true" stack offsets.
2981
2982 if (comp_args_on_stack) {
2983 for (int i = 0; i < cnt; i++) {
2984 VMReg reg1 = regs[i].first();
2985 if (reg1->is_stack()) {
2986 // Yuck
2987 reg1 = reg1->bias(out_preserve_stack_slots());
2988 }
2989 VMReg reg2 = regs[i].second();
2990 if (reg2->is_stack()) {
2991 // Yuck
2992 reg2 = reg2->bias(out_preserve_stack_slots());
2993 }
2994 regs[i].set_pair(reg2, reg1);
2995 }
2996 }
2997
2998 // results
2999 *arg_size = cnt;
3000 return regs;
3001 }
3002
3003 // OSR Migration Code
3004 //
3005 // This code is used convert interpreter frames into compiled frames. It is
3006 // called from very start of a compiled OSR nmethod. A temp array is
3007 // allocated to hold the interesting bits of the interpreter frame. All
3008 // active locks are inflated to allow them to move. The displaced headers and
3009 // active interpreter locals are copied into the temp buffer. Then we return
3010 // back to the compiled code. The compiled code then pops the current
3011 // interpreter frame off the stack and pushes a new compiled frame. Then it
3012 // copies the interpreter locals and displaced headers where it wants.
3013 // Finally it calls back to free the temp buffer.
3014 //
3015 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3016
3017 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
3018
3019 //
3020 // This code is dependent on the memory layout of the interpreter local
3021 // array and the monitors. On all of our platforms the layout is identical
3022 // so this code is shared. If some platform lays the their arrays out
3023 // differently then this code could move to platform specific code or
3024 // the code here could be modified to copy items one at a time using
3025 // frame accessor methods and be platform independent.
3026
3027 frame fr = thread->last_frame();
3028 assert(fr.is_interpreted_frame(), "");
3029 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3030
3031 // Figure out how many monitors are active.
3032 int active_monitor_count = 0;
3033 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3034 kptr < fr.interpreter_frame_monitor_begin();
3035 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3036 if (kptr->obj() != NULL) active_monitor_count++;
3037 }
3038
3039 // QQQ we could place number of active monitors in the array so that compiled code
3040 // could double check it.
3041
3042 Method* moop = fr.interpreter_frame_method();
3043 int max_locals = moop->max_locals();
3044 // Allocate temp buffer, 1 word per local & 2 per active monitor
3045 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3046 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3047
3048 // Copy the locals. Order is preserved so that loading of longs works.
3049 // Since there's no GC I can copy the oops blindly.
3050 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3051 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3052 (HeapWord*)&buf[0],
3053 max_locals);
3054
3055 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3056 int i = max_locals;
3057 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3058 kptr2 < fr.interpreter_frame_monitor_begin();
3059 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3060 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
3061 BasicLock *lock = kptr2->lock();
3062 // Inflate so the displaced header becomes position-independent
3063 if (lock->displaced_header()->is_unlocked())
3064 ObjectSynchronizer::inflate_helper(kptr2->obj());
3065 // Now the displaced header is free to move
3066 buf[i++] = (intptr_t)lock->displaced_header();
3067 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3068 }
3069 }
3070 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3071
3072 return buf;
3073 JRT_END
3074
3075 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3076 FREE_C_HEAP_ARRAY(intptr_t, buf);
3077 JRT_END
3078
3079 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3080 AdapterHandlerTableIterator iter(_adapters);
3081 while (iter.has_next()) {
3082 AdapterHandlerEntry* a = iter.next();
3083 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true;
3084 }
3085 return false;
3086 }
3087
3088 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3089 AdapterHandlerTableIterator iter(_adapters);
3090 while (iter.has_next()) {
3091 AdapterHandlerEntry* a = iter.next();
3092 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3093 st->print("Adapter for signature: ");
3094 a->print_adapter_on(tty);
3095 return;
3096 }
3097 }
3098 assert(false, "Should have found handler");
3099 }
3100
3101 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3102 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
3103 p2i(this), fingerprint()->as_string(),
3104 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry()));
3105
3106 }
3107
3108 #if INCLUDE_CDS
3109
3110 void CDSAdapterHandlerEntry::init() {
3111 assert(DumpSharedSpaces, "used during dump time only");
3112 _c2i_entry_trampoline = (address)MetaspaceShared::misc_data_space_alloc(SharedRuntime::trampoline_size());
3113 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_data_space_alloc(sizeof(AdapterHandlerEntry*));
3114 };
3115
3116 #endif // INCLUDE_CDS
3117
3118
3119 #ifndef PRODUCT
3120
3121 void AdapterHandlerLibrary::print_statistics() {
3122 _adapters->print_statistics();
3123 }
3124
3125 #endif /* PRODUCT */
3126
3127 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread))
3128 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone");
3129 thread->enable_stack_reserved_zone();
3130 thread->set_reserved_stack_activation(thread->stack_base());
3131 JRT_END
3132
3133 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) {
3134 frame activation;
3135 CompiledMethod* nm = NULL;
3136 int count = 1;
3137
3138 assert(fr.is_java_frame(), "Must start on Java frame");
3139
3140 while (true) {
3141 Method* method = NULL;
3142 if (fr.is_interpreted_frame()) {
3143 method = fr.interpreter_frame_method();
3144 } else {
3145 CodeBlob* cb = fr.cb();
3146 if (cb != NULL && cb->is_compiled()) {
3147 nm = cb->as_compiled_method();
3148 method = nm->method();
3149 }
3150 }
3151 if ((method != NULL) && method->has_reserved_stack_access()) {
3152 ResourceMark rm(thread);
3153 activation = fr;
3154 warning("Potentially dangerous stack overflow in "
3155 "ReservedStackAccess annotated method %s [%d]",
3156 method->name_and_sig_as_C_string(), count++);
3157 EventReservedStackActivation event;
3158 if (event.should_commit()) {
3159 event.set_method(method);
3160 event.commit();
3161 }
3162 }
3163 if (fr.is_first_java_frame()) {
3164 break;
3165 } else {
3166 fr = fr.java_sender();
3167 }
3168 }
3169 return activation;
3170 }
3171