1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "gc/shared/gcLocker.inline.hpp"
39 #include "interpreter/interpreter.hpp"
40 #include "interpreter/interpreterRuntime.hpp"
41 #include "logging/log.hpp"
42 #include "memory/metaspaceShared.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.inline.hpp"
45 #include "oops/klass.hpp"
46 #include "oops/objArrayKlass.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "prims/forte.hpp"
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 COMPILER2_OR_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_OR_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(oopDesc::is_oop(orig, 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) && oopDesc::is_oop(result), "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 return Deoptimization::deoptimize_for_missing_exception_handler(cm);
642 }
643 }
644 #endif // INCLUDE_JVMCI
645
646 nmethod* nm = cm->as_nmethod();
647 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
648 // determine handler bci, if any
649 EXCEPTION_MARK;
650
651 int handler_bci = -1;
652 int scope_depth = 0;
653 if (!force_unwind) {
654 int bci = sd->bci();
655 bool recursive_exception = false;
656 do {
657 bool skip_scope_increment = false;
658 // exception handler lookup
659 Klass* ek = exception->klass();
660 methodHandle mh(THREAD, sd->method());
661 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
662 if (HAS_PENDING_EXCEPTION) {
663 recursive_exception = true;
664 // We threw an exception while trying to find the exception handler.
665 // Transfer the new exception to the exception handle which will
666 // be set into thread local storage, and do another lookup for an
667 // exception handler for this exception, this time starting at the
668 // BCI of the exception handler which caused the exception to be
669 // thrown (bugs 4307310 and 4546590). Set "exception" reference
670 // argument to ensure that the correct exception is thrown (4870175).
671 recursive_exception_occurred = true;
672 exception = Handle(THREAD, PENDING_EXCEPTION);
673 CLEAR_PENDING_EXCEPTION;
674 if (handler_bci >= 0) {
675 bci = handler_bci;
676 handler_bci = -1;
677 skip_scope_increment = true;
678 }
679 }
680 else {
681 recursive_exception = false;
682 }
683 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
684 sd = sd->sender();
685 if (sd != NULL) {
686 bci = sd->bci();
687 }
688 ++scope_depth;
689 }
690 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
691 }
692
693 // found handling method => lookup exception handler
694 int catch_pco = ret_pc - nm->code_begin();
695
696 ExceptionHandlerTable table(nm);
697 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
698 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
699 // Allow abbreviated catch tables. The idea is to allow a method
700 // to materialize its exceptions without committing to the exact
701 // routing of exceptions. In particular this is needed for adding
702 // a synthetic handler to unlock monitors when inlining
703 // synchronized methods since the unlock path isn't represented in
704 // the bytecodes.
705 t = table.entry_for(catch_pco, -1, 0);
706 }
707
708 #ifdef COMPILER1
709 if (t == NULL && nm->is_compiled_by_c1()) {
710 assert(nm->unwind_handler_begin() != NULL, "");
711 return nm->unwind_handler_begin();
712 }
713 #endif
714
715 if (t == NULL) {
716 ttyLocker ttyl;
717 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci);
718 tty->print_cr(" Exception:");
719 exception->print();
720 tty->cr();
721 tty->print_cr(" Compiled exception table :");
722 table.print();
723 nm->print_code();
724 guarantee(false, "missing exception handler");
725 return NULL;
726 }
727
728 return nm->code_begin() + t->pco();
729 }
730
731 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
732 // These errors occur only at call sites
733 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
734 JRT_END
735
736 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
737 // These errors occur only at call sites
738 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
739 JRT_END
740
741 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
742 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
743 JRT_END
744
745 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
746 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
747 JRT_END
748
749 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
750 // This entry point is effectively only used for NullPointerExceptions which occur at inline
751 // cache sites (when the callee activation is not yet set up) so we are at a call site
752 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
753 JRT_END
754
755 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
756 throw_StackOverflowError_common(thread, false);
757 JRT_END
758
759 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
760 throw_StackOverflowError_common(thread, true);
761 JRT_END
762
763 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) {
764 // We avoid using the normal exception construction in this case because
765 // it performs an upcall to Java, and we're already out of stack space.
766 Thread* THREAD = thread;
767 Klass* k = SystemDictionary::StackOverflowError_klass();
768 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
769 if (delayed) {
770 java_lang_Throwable::set_message(exception_oop,
771 Universe::delayed_stack_overflow_error_message());
772 }
773 Handle exception (thread, exception_oop);
774 if (StackTraceInThrowable) {
775 java_lang_Throwable::fill_in_stack_trace(exception);
776 }
777 // Increment counter for hs_err file reporting
778 Atomic::inc(&Exceptions::_stack_overflow_errors);
779 throw_and_post_jvmti_exception(thread, exception);
780 }
781
782 #if INCLUDE_JVMCI
783 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason) {
784 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason");
785 thread->set_jvmci_implicit_exception_pc(pc);
786 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret));
787 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
788 }
789 #endif // INCLUDE_JVMCI
790
791 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
792 address pc,
793 SharedRuntime::ImplicitExceptionKind exception_kind)
794 {
795 address target_pc = NULL;
796
797 if (Interpreter::contains(pc)) {
798 #ifdef CC_INTERP
799 // C++ interpreter doesn't throw implicit exceptions
800 ShouldNotReachHere();
801 #else
802 switch (exception_kind) {
803 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
804 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
805 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
806 default: ShouldNotReachHere();
807 }
808 #endif // !CC_INTERP
809 } else {
810 switch (exception_kind) {
811 case STACK_OVERFLOW: {
812 // Stack overflow only occurs upon frame setup; the callee is
813 // going to be unwound. Dispatch to a shared runtime stub
814 // which will cause the StackOverflowError to be fabricated
815 // and processed.
816 // Stack overflow should never occur during deoptimization:
817 // the compiled method bangs the stack by as much as the
818 // interpreter would need in case of a deoptimization. The
819 // deoptimization blob and uncommon trap blob bang the stack
820 // in a debug VM to verify the correctness of the compiled
821 // method stack banging.
822 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
823 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
824 return StubRoutines::throw_StackOverflowError_entry();
825 }
826
827 case IMPLICIT_NULL: {
828 if (VtableStubs::contains(pc)) {
829 // We haven't yet entered the callee frame. Fabricate an
830 // exception and begin dispatching it in the caller. Since
831 // the caller was at a call site, it's safe to destroy all
832 // caller-saved registers, as these entry points do.
833 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
834
835 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
836 if (vt_stub == NULL) return NULL;
837
838 if (vt_stub->is_abstract_method_error(pc)) {
839 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
840 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
841 return StubRoutines::throw_AbstractMethodError_entry();
842 } else {
843 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
844 return StubRoutines::throw_NullPointerException_at_call_entry();
845 }
846 } else {
847 CodeBlob* cb = CodeCache::find_blob(pc);
848
849 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
850 if (cb == NULL) return NULL;
851
852 // Exception happened in CodeCache. Must be either:
853 // 1. Inline-cache check in C2I handler blob,
854 // 2. Inline-cache check in nmethod, or
855 // 3. Implicit null exception in nmethod
856
857 if (!cb->is_compiled()) {
858 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
859 if (!is_in_blob) {
860 // Allow normal crash reporting to handle this
861 return NULL;
862 }
863 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
864 // There is no handler here, so we will simply unwind.
865 return StubRoutines::throw_NullPointerException_at_call_entry();
866 }
867
868 // Otherwise, it's a compiled method. Consult its exception handlers.
869 CompiledMethod* cm = (CompiledMethod*)cb;
870 if (cm->inlinecache_check_contains(pc)) {
871 // exception happened inside inline-cache check code
872 // => the nmethod is not yet active (i.e., the frame
873 // is not set up yet) => use return address pushed by
874 // caller => don't push another return address
875 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
876 return StubRoutines::throw_NullPointerException_at_call_entry();
877 }
878
879 if (cm->method()->is_method_handle_intrinsic()) {
880 // exception happened inside MH dispatch code, similar to a vtable stub
881 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
882 return StubRoutines::throw_NullPointerException_at_call_entry();
883 }
884
885 #ifndef PRODUCT
886 _implicit_null_throws++;
887 #endif
888 #if INCLUDE_JVMCI
889 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) {
890 // If there's no PcDesc then we'll die way down inside of
891 // deopt instead of just getting normal error reporting,
892 // so only go there if it will succeed.
893 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_null_check);
894 } else {
895 #endif // INCLUDE_JVMCI
896 assert (cm->is_nmethod(), "Expect nmethod");
897 target_pc = ((nmethod*)cm)->continuation_for_implicit_exception(pc);
898 #if INCLUDE_JVMCI
899 }
900 #endif // INCLUDE_JVMCI
901 // If there's an unexpected fault, target_pc might be NULL,
902 // in which case we want to fall through into the normal
903 // error handling code.
904 }
905
906 break; // fall through
907 }
908
909
910 case IMPLICIT_DIVIDE_BY_ZERO: {
911 CompiledMethod* cm = CodeCache::find_compiled(pc);
912 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions");
913 #ifndef PRODUCT
914 _implicit_div0_throws++;
915 #endif
916 #if INCLUDE_JVMCI
917 if (cm->is_compiled_by_jvmci() && cm->pc_desc_at(pc) != NULL) {
918 return deoptimize_for_implicit_exception(thread, pc, cm, Deoptimization::Reason_div0_check);
919 } else {
920 #endif // INCLUDE_JVMCI
921 target_pc = cm->continuation_for_implicit_exception(pc);
922 #if INCLUDE_JVMCI
923 }
924 #endif // INCLUDE_JVMCI
925 // If there's an unexpected fault, target_pc might be NULL,
926 // in which case we want to fall through into the normal
927 // error handling code.
928 break; // fall through
929 }
930
931 default: ShouldNotReachHere();
932 }
933
934 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
935
936 if (exception_kind == IMPLICIT_NULL) {
937 #ifndef PRODUCT
938 // for AbortVMOnException flag
939 Exceptions::debug_check_abort("java.lang.NullPointerException");
940 #endif //PRODUCT
941 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
942 } else {
943 #ifndef PRODUCT
944 // for AbortVMOnException flag
945 Exceptions::debug_check_abort("java.lang.ArithmeticException");
946 #endif //PRODUCT
947 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
948 }
949 return target_pc;
950 }
951
952 ShouldNotReachHere();
953 return NULL;
954 }
955
956
957 /**
958 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
959 * installed in the native function entry of all native Java methods before
960 * they get linked to their actual native methods.
961 *
962 * \note
963 * This method actually never gets called! The reason is because
964 * the interpreter's native entries call NativeLookup::lookup() which
965 * throws the exception when the lookup fails. The exception is then
966 * caught and forwarded on the return from NativeLookup::lookup() call
967 * before the call to the native function. This might change in the future.
968 */
969 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
970 {
971 // We return a bad value here to make sure that the exception is
972 // forwarded before we look at the return value.
973 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
974 }
975 JNI_END
976
977 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
978 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
979 }
980
981 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
982 #if INCLUDE_JVMCI
983 if (!obj->klass()->has_finalizer()) {
984 return;
985 }
986 #endif // INCLUDE_JVMCI
987 assert(oopDesc::is_oop(obj), "must be a valid oop");
988 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
989 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
990 JRT_END
991
992
993 jlong SharedRuntime::get_java_tid(Thread* thread) {
994 if (thread != NULL) {
995 if (thread->is_Java_thread()) {
996 oop obj = ((JavaThread*)thread)->threadObj();
997 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
998 }
999 }
1000 return 0;
1001 }
1002
1003 /**
1004 * This function ought to be a void function, but cannot be because
1005 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1006 * 6254741. Once that is fixed we can remove the dummy return value.
1007 */
1008 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
1009 return dtrace_object_alloc_base(Thread::current(), o, size);
1010 }
1011
1012 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
1013 assert(DTraceAllocProbes, "wrong call");
1014 Klass* klass = o->klass();
1015 Symbol* name = klass->name();
1016 HOTSPOT_OBJECT_ALLOC(
1017 get_java_tid(thread),
1018 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1019 return 0;
1020 }
1021
1022 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1023 JavaThread* thread, Method* method))
1024 assert(DTraceMethodProbes, "wrong call");
1025 Symbol* kname = method->klass_name();
1026 Symbol* name = method->name();
1027 Symbol* sig = method->signature();
1028 HOTSPOT_METHOD_ENTRY(
1029 get_java_tid(thread),
1030 (char *) kname->bytes(), kname->utf8_length(),
1031 (char *) name->bytes(), name->utf8_length(),
1032 (char *) sig->bytes(), sig->utf8_length());
1033 return 0;
1034 JRT_END
1035
1036 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1037 JavaThread* thread, Method* method))
1038 assert(DTraceMethodProbes, "wrong call");
1039 Symbol* kname = method->klass_name();
1040 Symbol* name = method->name();
1041 Symbol* sig = method->signature();
1042 HOTSPOT_METHOD_RETURN(
1043 get_java_tid(thread),
1044 (char *) kname->bytes(), kname->utf8_length(),
1045 (char *) name->bytes(), name->utf8_length(),
1046 (char *) sig->bytes(), sig->utf8_length());
1047 return 0;
1048 JRT_END
1049
1050
1051 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1052 // for a call current in progress, i.e., arguments has been pushed on stack
1053 // put callee has not been invoked yet. Used by: resolve virtual/static,
1054 // vtable updates, etc. Caller frame must be compiled.
1055 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1056 ResourceMark rm(THREAD);
1057
1058 // last java frame on stack (which includes native call frames)
1059 vframeStream vfst(thread, true); // Do not skip and javaCalls
1060
1061 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD);
1062 }
1063
1064 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) {
1065 CompiledMethod* caller = vfst.nm();
1066
1067 nmethodLocker caller_lock(caller);
1068
1069 address pc = vfst.frame_pc();
1070 { // Get call instruction under lock because another thread may be busy patching it.
1071 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1072 return caller->attached_method_before_pc(pc);
1073 }
1074 return NULL;
1075 }
1076
1077 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1078 // for a call current in progress, i.e., arguments has been pushed on stack
1079 // but callee has not been invoked yet. Caller frame must be compiled.
1080 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1081 vframeStream& vfst,
1082 Bytecodes::Code& bc,
1083 CallInfo& callinfo, TRAPS) {
1084 Handle receiver;
1085 Handle nullHandle; //create a handy null handle for exception returns
1086
1087 assert(!vfst.at_end(), "Java frame must exist");
1088
1089 // Find caller and bci from vframe
1090 methodHandle caller(THREAD, vfst.method());
1091 int bci = vfst.bci();
1092
1093 Bytecode_invoke bytecode(caller, bci);
1094 int bytecode_index = bytecode.index();
1095
1096 methodHandle attached_method = extract_attached_method(vfst);
1097 if (attached_method.not_null()) {
1098 methodHandle callee = bytecode.static_target(CHECK_NH);
1099 vmIntrinsics::ID id = callee->intrinsic_id();
1100 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1101 // it attaches statically resolved method to the call site.
1102 if (MethodHandles::is_signature_polymorphic(id) &&
1103 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1104 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1105
1106 // Adjust invocation mode according to the attached method.
1107 switch (bc) {
1108 case Bytecodes::_invokeinterface:
1109 if (!attached_method->method_holder()->is_interface()) {
1110 bc = Bytecodes::_invokevirtual;
1111 }
1112 break;
1113 case Bytecodes::_invokehandle:
1114 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1115 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1116 : Bytecodes::_invokevirtual;
1117 }
1118 break;
1119 default:
1120 break;
1121 }
1122 }
1123 } else {
1124 bc = bytecode.invoke_code();
1125 }
1126
1127 bool has_receiver = bc != Bytecodes::_invokestatic &&
1128 bc != Bytecodes::_invokedynamic &&
1129 bc != Bytecodes::_invokehandle;
1130
1131 // Find receiver for non-static call
1132 if (has_receiver) {
1133 // This register map must be update since we need to find the receiver for
1134 // compiled frames. The receiver might be in a register.
1135 RegisterMap reg_map2(thread);
1136 frame stubFrame = thread->last_frame();
1137 // Caller-frame is a compiled frame
1138 frame callerFrame = stubFrame.sender(®_map2);
1139
1140 if (attached_method.is_null()) {
1141 methodHandle callee = bytecode.static_target(CHECK_NH);
1142 if (callee.is_null()) {
1143 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1144 }
1145 }
1146
1147 // Retrieve from a compiled argument list
1148 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1149
1150 if (receiver.is_null()) {
1151 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1152 }
1153 }
1154
1155 // Resolve method
1156 if (attached_method.not_null()) {
1157 // Parameterized by attached method.
1158 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1159 } else {
1160 // Parameterized by bytecode.
1161 constantPoolHandle constants(THREAD, caller->constants());
1162 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1163 }
1164
1165 #ifdef ASSERT
1166 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1167 if (has_receiver) {
1168 assert(receiver.not_null(), "should have thrown exception");
1169 Klass* receiver_klass = receiver->klass();
1170 Klass* rk = NULL;
1171 if (attached_method.not_null()) {
1172 // In case there's resolved method attached, use its holder during the check.
1173 rk = attached_method->method_holder();
1174 } else {
1175 // Klass is already loaded.
1176 constantPoolHandle constants(THREAD, caller->constants());
1177 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1178 }
1179 Klass* static_receiver_klass = rk;
1180 methodHandle callee = callinfo.selected_method();
1181 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1182 "actual receiver must be subclass of static receiver klass");
1183 if (receiver_klass->is_instance_klass()) {
1184 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1185 tty->print_cr("ERROR: Klass not yet initialized!!");
1186 receiver_klass->print();
1187 }
1188 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1189 }
1190 }
1191 #endif
1192
1193 return receiver;
1194 }
1195
1196 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1197 ResourceMark rm(THREAD);
1198 // We need first to check if any Java activations (compiled, interpreted)
1199 // exist on the stack since last JavaCall. If not, we need
1200 // to get the target method from the JavaCall wrapper.
1201 vframeStream vfst(thread, true); // Do not skip any javaCalls
1202 methodHandle callee_method;
1203 if (vfst.at_end()) {
1204 // No Java frames were found on stack since we did the JavaCall.
1205 // Hence the stack can only contain an entry_frame. We need to
1206 // find the target method from the stub frame.
1207 RegisterMap reg_map(thread, false);
1208 frame fr = thread->last_frame();
1209 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1210 fr = fr.sender(®_map);
1211 assert(fr.is_entry_frame(), "must be");
1212 // fr is now pointing to the entry frame.
1213 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1214 } else {
1215 Bytecodes::Code bc;
1216 CallInfo callinfo;
1217 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1218 callee_method = callinfo.selected_method();
1219 }
1220 assert(callee_method()->is_method(), "must be");
1221 return callee_method;
1222 }
1223
1224 // Resolves a call.
1225 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1226 bool is_virtual,
1227 bool is_optimized, TRAPS) {
1228 methodHandle callee_method;
1229 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1230 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1231 int retry_count = 0;
1232 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1233 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1234 // If has a pending exception then there is no need to re-try to
1235 // resolve this method.
1236 // If the method has been redefined, we need to try again.
1237 // Hack: we have no way to update the vtables of arrays, so don't
1238 // require that java.lang.Object has been updated.
1239
1240 // It is very unlikely that method is redefined more than 100 times
1241 // in the middle of resolve. If it is looping here more than 100 times
1242 // means then there could be a bug here.
1243 guarantee((retry_count++ < 100),
1244 "Could not resolve to latest version of redefined method");
1245 // method is redefined in the middle of resolve so re-try.
1246 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1247 }
1248 }
1249 return callee_method;
1250 }
1251
1252 // Resolves a call. The compilers generate code for calls that go here
1253 // and are patched with the real destination of the call.
1254 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1255 bool is_virtual,
1256 bool is_optimized, TRAPS) {
1257
1258 ResourceMark rm(thread);
1259 RegisterMap cbl_map(thread, false);
1260 frame caller_frame = thread->last_frame().sender(&cbl_map);
1261
1262 CodeBlob* caller_cb = caller_frame.cb();
1263 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1264 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1265
1266 // make sure caller is not getting deoptimized
1267 // and removed before we are done with it.
1268 // CLEANUP - with lazy deopt shouldn't need this lock
1269 nmethodLocker caller_lock(caller_nm);
1270
1271 // determine call info & receiver
1272 // note: a) receiver is NULL for static calls
1273 // b) an exception is thrown if receiver is NULL for non-static calls
1274 CallInfo call_info;
1275 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1276 Handle receiver = find_callee_info(thread, invoke_code,
1277 call_info, CHECK_(methodHandle()));
1278 methodHandle callee_method = call_info.selected_method();
1279
1280 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1281 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1282 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1283 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1284 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1285
1286 assert(caller_nm->is_alive(), "It should be alive");
1287
1288 #ifndef PRODUCT
1289 // tracing/debugging/statistics
1290 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1291 (is_virtual) ? (&_resolve_virtual_ctr) :
1292 (&_resolve_static_ctr);
1293 Atomic::inc(addr);
1294
1295 if (TraceCallFixup) {
1296 ResourceMark rm(thread);
1297 tty->print("resolving %s%s (%s) call to",
1298 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1299 Bytecodes::name(invoke_code));
1300 callee_method->print_short_name(tty);
1301 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1302 p2i(caller_frame.pc()), p2i(callee_method->code()));
1303 }
1304 #endif
1305
1306 // JSR 292 key invariant:
1307 // If the resolved method is a MethodHandle invoke target, the call
1308 // site must be a MethodHandle call site, because the lambda form might tail-call
1309 // leaving the stack in a state unknown to either caller or callee
1310 // TODO detune for now but we might need it again
1311 // assert(!callee_method->is_compiled_lambda_form() ||
1312 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1313
1314 // Compute entry points. This might require generation of C2I converter
1315 // frames, so we cannot be holding any locks here. Furthermore, the
1316 // computation of the entry points is independent of patching the call. We
1317 // always return the entry-point, but we only patch the stub if the call has
1318 // not been deoptimized. Return values: For a virtual call this is an
1319 // (cached_oop, destination address) pair. For a static call/optimized
1320 // virtual this is just a destination address.
1321
1322 StaticCallInfo static_call_info;
1323 CompiledICInfo virtual_call_info;
1324
1325 // Make sure the callee nmethod does not get deoptimized and removed before
1326 // we are done patching the code.
1327 CompiledMethod* callee = callee_method->code();
1328
1329 if (callee != NULL) {
1330 assert(callee->is_compiled(), "must be nmethod for patching");
1331 }
1332
1333 if (callee != NULL && !callee->is_in_use()) {
1334 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1335 callee = NULL;
1336 }
1337 nmethodLocker nl_callee(callee);
1338 #ifdef ASSERT
1339 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1340 #endif
1341
1342 bool is_nmethod = caller_nm->is_nmethod();
1343
1344 if (is_virtual) {
1345 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1346 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1347 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass();
1348 CompiledIC::compute_monomorphic_entry(callee_method, klass,
1349 is_optimized, static_bound, is_nmethod, virtual_call_info,
1350 CHECK_(methodHandle()));
1351 } else {
1352 // static call
1353 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info);
1354 }
1355
1356 // grab lock, check for deoptimization and potentially patch caller
1357 {
1358 MutexLocker ml_patch(CompiledIC_lock);
1359
1360 // Lock blocks for safepoint during which both nmethods can change state.
1361
1362 // Now that we are ready to patch if the Method* was redefined then
1363 // don't update call site and let the caller retry.
1364 // Don't update call site if callee nmethod was unloaded or deoptimized.
1365 // Don't update call site if callee nmethod was replaced by an other nmethod
1366 // which may happen when multiply alive nmethod (tiered compilation)
1367 // will be supported.
1368 if (!callee_method->is_old() &&
1369 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) {
1370 #ifdef ASSERT
1371 // We must not try to patch to jump to an already unloaded method.
1372 if (dest_entry_point != 0) {
1373 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1374 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee),
1375 "should not call unloaded nmethod");
1376 }
1377 #endif
1378 if (is_virtual) {
1379 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1380 if (inline_cache->is_clean()) {
1381 inline_cache->set_to_monomorphic(virtual_call_info);
1382 }
1383 } else {
1384 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc());
1385 if (ssc->is_clean()) ssc->set(static_call_info);
1386 }
1387 }
1388
1389 } // unlock CompiledIC_lock
1390
1391 return callee_method;
1392 }
1393
1394
1395 // Inline caches exist only in compiled code
1396 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1397 #ifdef ASSERT
1398 RegisterMap reg_map(thread, false);
1399 frame stub_frame = thread->last_frame();
1400 assert(stub_frame.is_runtime_frame(), "sanity check");
1401 frame caller_frame = stub_frame.sender(®_map);
1402 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1403 #endif /* ASSERT */
1404
1405 methodHandle callee_method;
1406 JRT_BLOCK
1407 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1408 // Return Method* through TLS
1409 thread->set_vm_result_2(callee_method());
1410 JRT_BLOCK_END
1411 // return compiled code entry point after potential safepoints
1412 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1413 return callee_method->verified_code_entry();
1414 JRT_END
1415
1416
1417 // Handle call site that has been made non-entrant
1418 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1419 // 6243940 We might end up in here if the callee is deoptimized
1420 // as we race to call it. We don't want to take a safepoint if
1421 // the caller was interpreted because the caller frame will look
1422 // interpreted to the stack walkers and arguments are now
1423 // "compiled" so it is much better to make this transition
1424 // invisible to the stack walking code. The i2c path will
1425 // place the callee method in the callee_target. It is stashed
1426 // there because if we try and find the callee by normal means a
1427 // safepoint is possible and have trouble gc'ing the compiled args.
1428 RegisterMap reg_map(thread, false);
1429 frame stub_frame = thread->last_frame();
1430 assert(stub_frame.is_runtime_frame(), "sanity check");
1431 frame caller_frame = stub_frame.sender(®_map);
1432
1433 if (caller_frame.is_interpreted_frame() ||
1434 caller_frame.is_entry_frame()) {
1435 Method* callee = thread->callee_target();
1436 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1437 thread->set_vm_result_2(callee);
1438 thread->set_callee_target(NULL);
1439 return callee->get_c2i_entry();
1440 }
1441
1442 // Must be compiled to compiled path which is safe to stackwalk
1443 methodHandle callee_method;
1444 JRT_BLOCK
1445 // Force resolving of caller (if we called from compiled frame)
1446 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1447 thread->set_vm_result_2(callee_method());
1448 JRT_BLOCK_END
1449 // return compiled code entry point after potential safepoints
1450 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1451 return callee_method->verified_code_entry();
1452 JRT_END
1453
1454 // Handle abstract method call
1455 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1456 return StubRoutines::throw_AbstractMethodError_entry();
1457 JRT_END
1458
1459
1460 // resolve a static call and patch code
1461 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1462 methodHandle callee_method;
1463 JRT_BLOCK
1464 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1465 thread->set_vm_result_2(callee_method());
1466 JRT_BLOCK_END
1467 // return compiled code entry point after potential safepoints
1468 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1469 return callee_method->verified_code_entry();
1470 JRT_END
1471
1472
1473 // resolve virtual call and update inline cache to monomorphic
1474 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1475 methodHandle callee_method;
1476 JRT_BLOCK
1477 callee_method = SharedRuntime::resolve_helper(thread, true, 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 a virtual call that can be statically bound (e.g., always
1487 // monomorphic, so it has no inline cache). Patch code to resolved target.
1488 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1489 methodHandle callee_method;
1490 JRT_BLOCK
1491 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1492 thread->set_vm_result_2(callee_method());
1493 JRT_BLOCK_END
1494 // return compiled code entry point after potential safepoints
1495 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1496 return callee_method->verified_code_entry();
1497 JRT_END
1498
1499
1500
1501 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1502 ResourceMark rm(thread);
1503 CallInfo call_info;
1504 Bytecodes::Code bc;
1505
1506 // receiver is NULL for static calls. An exception is thrown for NULL
1507 // receivers for non-static calls
1508 Handle receiver = find_callee_info(thread, bc, call_info,
1509 CHECK_(methodHandle()));
1510 // Compiler1 can produce virtual call sites that can actually be statically bound
1511 // If we fell thru to below we would think that the site was going megamorphic
1512 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1513 // we'd try and do a vtable dispatch however methods that can be statically bound
1514 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1515 // reresolution of the call site (as if we did a handle_wrong_method and not an
1516 // plain ic_miss) and the site will be converted to an optimized virtual call site
1517 // never to miss again. I don't believe C2 will produce code like this but if it
1518 // did this would still be the correct thing to do for it too, hence no ifdef.
1519 //
1520 if (call_info.resolved_method()->can_be_statically_bound()) {
1521 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1522 if (TraceCallFixup) {
1523 RegisterMap reg_map(thread, false);
1524 frame caller_frame = thread->last_frame().sender(®_map);
1525 ResourceMark rm(thread);
1526 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1527 callee_method->print_short_name(tty);
1528 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1529 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1530 }
1531 return callee_method;
1532 }
1533
1534 methodHandle callee_method = call_info.selected_method();
1535
1536 bool should_be_mono = false;
1537
1538 #ifndef PRODUCT
1539 Atomic::inc(&_ic_miss_ctr);
1540
1541 // Statistics & Tracing
1542 if (TraceCallFixup) {
1543 ResourceMark rm(thread);
1544 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1545 callee_method->print_short_name(tty);
1546 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1547 }
1548
1549 if (ICMissHistogram) {
1550 MutexLocker m(VMStatistic_lock);
1551 RegisterMap reg_map(thread, false);
1552 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1553 // produce statistics under the lock
1554 trace_ic_miss(f.pc());
1555 }
1556 #endif
1557
1558 // install an event collector so that when a vtable stub is created the
1559 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1560 // event can't be posted when the stub is created as locks are held
1561 // - instead the event will be deferred until the event collector goes
1562 // out of scope.
1563 JvmtiDynamicCodeEventCollector event_collector;
1564
1565 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1566 { MutexLocker ml_patch (CompiledIC_lock);
1567 RegisterMap reg_map(thread, false);
1568 frame caller_frame = thread->last_frame().sender(®_map);
1569 CodeBlob* cb = caller_frame.cb();
1570 CompiledMethod* caller_nm = cb->as_compiled_method_or_null();
1571 if (cb->is_compiled()) {
1572 CompiledIC* inline_cache = CompiledIC_before(((CompiledMethod*)cb), caller_frame.pc());
1573 bool should_be_mono = false;
1574 if (inline_cache->is_optimized()) {
1575 if (TraceCallFixup) {
1576 ResourceMark rm(thread);
1577 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1578 callee_method->print_short_name(tty);
1579 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1580 }
1581 should_be_mono = true;
1582 } else if (inline_cache->is_icholder_call()) {
1583 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1584 if (ic_oop != NULL) {
1585
1586 if (receiver()->klass() == ic_oop->holder_klass()) {
1587 // This isn't a real miss. We must have seen that compiled code
1588 // is now available and we want the call site converted to a
1589 // monomorphic compiled call site.
1590 // We can't assert for callee_method->code() != NULL because it
1591 // could have been deoptimized in the meantime
1592 if (TraceCallFixup) {
1593 ResourceMark rm(thread);
1594 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1595 callee_method->print_short_name(tty);
1596 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1597 }
1598 should_be_mono = true;
1599 }
1600 }
1601 }
1602
1603 if (should_be_mono) {
1604
1605 // We have a path that was monomorphic but was going interpreted
1606 // and now we have (or had) a compiled entry. We correct the IC
1607 // by using a new icBuffer.
1608 CompiledICInfo info;
1609 Klass* receiver_klass = receiver()->klass();
1610 inline_cache->compute_monomorphic_entry(callee_method,
1611 receiver_klass,
1612 inline_cache->is_optimized(),
1613 false, caller_nm->is_nmethod(),
1614 info, CHECK_(methodHandle()));
1615 inline_cache->set_to_monomorphic(info);
1616 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1617 // Potential change to megamorphic
1618 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1619 if (!successful) {
1620 inline_cache->set_to_clean();
1621 }
1622 } else {
1623 // Either clean or megamorphic
1624 }
1625 } else {
1626 fatal("Unimplemented");
1627 }
1628 } // Release CompiledIC_lock
1629
1630 return callee_method;
1631 }
1632
1633 //
1634 // Resets a call-site in compiled code so it will get resolved again.
1635 // This routines handles both virtual call sites, optimized virtual call
1636 // sites, and static call sites. Typically used to change a call sites
1637 // destination from compiled to interpreted.
1638 //
1639 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1640 ResourceMark rm(thread);
1641 RegisterMap reg_map(thread, false);
1642 frame stub_frame = thread->last_frame();
1643 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1644 frame caller = stub_frame.sender(®_map);
1645
1646 // Do nothing if the frame isn't a live compiled frame.
1647 // nmethod could be deoptimized by the time we get here
1648 // so no update to the caller is needed.
1649
1650 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1651
1652 address pc = caller.pc();
1653
1654 // Check for static or virtual call
1655 bool is_static_call = false;
1656 CompiledMethod* caller_nm = CodeCache::find_compiled(pc);
1657
1658 // Default call_addr is the location of the "basic" call.
1659 // Determine the address of the call we a reresolving. With
1660 // Inline Caches we will always find a recognizable call.
1661 // With Inline Caches disabled we may or may not find a
1662 // recognizable call. We will always find a call for static
1663 // calls and for optimized virtual calls. For vanilla virtual
1664 // calls it depends on the state of the UseInlineCaches switch.
1665 //
1666 // With Inline Caches disabled we can get here for a virtual call
1667 // for two reasons:
1668 // 1 - calling an abstract method. The vtable for abstract methods
1669 // will run us thru handle_wrong_method and we will eventually
1670 // end up in the interpreter to throw the ame.
1671 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1672 // call and between the time we fetch the entry address and
1673 // we jump to it the target gets deoptimized. Similar to 1
1674 // we will wind up in the interprter (thru a c2i with c2).
1675 //
1676 address call_addr = NULL;
1677 {
1678 // Get call instruction under lock because another thread may be
1679 // busy patching it.
1680 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1681 // Location of call instruction
1682 call_addr = caller_nm->call_instruction_address(pc);
1683 }
1684 // Make sure nmethod doesn't get deoptimized and removed until
1685 // this is done with it.
1686 // CLEANUP - with lazy deopt shouldn't need this lock
1687 nmethodLocker nmlock(caller_nm);
1688
1689 if (call_addr != NULL) {
1690 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1691 int ret = iter.next(); // Get item
1692 if (ret) {
1693 assert(iter.addr() == call_addr, "must find call");
1694 if (iter.type() == relocInfo::static_call_type) {
1695 is_static_call = true;
1696 } else {
1697 assert(iter.type() == relocInfo::virtual_call_type ||
1698 iter.type() == relocInfo::opt_virtual_call_type
1699 , "unexpected relocInfo. type");
1700 }
1701 } else {
1702 assert(!UseInlineCaches, "relocation info. must exist for this address");
1703 }
1704
1705 // Cleaning the inline cache will force a new resolve. This is more robust
1706 // than directly setting it to the new destination, since resolving of calls
1707 // is always done through the same code path. (experience shows that it
1708 // leads to very hard to track down bugs, if an inline cache gets updated
1709 // to a wrong method). It should not be performance critical, since the
1710 // resolve is only done once.
1711
1712 bool is_nmethod = caller_nm->is_nmethod();
1713 MutexLocker ml(CompiledIC_lock);
1714 if (is_static_call) {
1715 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr);
1716 ssc->set_to_clean();
1717 } else {
1718 // compiled, dispatched call (which used to call an interpreted method)
1719 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1720 inline_cache->set_to_clean();
1721 }
1722 }
1723 }
1724
1725 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1726
1727
1728 #ifndef PRODUCT
1729 Atomic::inc(&_wrong_method_ctr);
1730
1731 if (TraceCallFixup) {
1732 ResourceMark rm(thread);
1733 tty->print("handle_wrong_method reresolving call to");
1734 callee_method->print_short_name(tty);
1735 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1736 }
1737 #endif
1738
1739 return callee_method;
1740 }
1741
1742 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1743 // The faulting unsafe accesses should be changed to throw the error
1744 // synchronously instead. Meanwhile the faulting instruction will be
1745 // skipped over (effectively turning it into a no-op) and an
1746 // asynchronous exception will be raised which the thread will
1747 // handle at a later point. If the instruction is a load it will
1748 // return garbage.
1749
1750 // Request an async exception.
1751 thread->set_pending_unsafe_access_error();
1752
1753 // Return address of next instruction to execute.
1754 return next_pc;
1755 }
1756
1757 #ifdef ASSERT
1758 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1759 const BasicType* sig_bt,
1760 const VMRegPair* regs) {
1761 ResourceMark rm;
1762 const int total_args_passed = method->size_of_parameters();
1763 const VMRegPair* regs_with_member_name = regs;
1764 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1765
1766 const int member_arg_pos = total_args_passed - 1;
1767 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1768 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1769
1770 const bool is_outgoing = method->is_method_handle_intrinsic();
1771 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1772
1773 for (int i = 0; i < member_arg_pos; i++) {
1774 VMReg a = regs_with_member_name[i].first();
1775 VMReg b = regs_without_member_name[i].first();
1776 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value());
1777 }
1778 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1779 }
1780 #endif
1781
1782 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) {
1783 if (destination != entry_point) {
1784 CodeBlob* callee = CodeCache::find_blob(destination);
1785 // callee == cb seems weird. It means calling interpreter thru stub.
1786 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) {
1787 // static call or optimized virtual
1788 if (TraceCallFixup) {
1789 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1790 moop->print_short_name(tty);
1791 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1792 }
1793 return true;
1794 } else {
1795 if (TraceCallFixup) {
1796 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1797 moop->print_short_name(tty);
1798 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1799 }
1800 // assert is too strong could also be resolve destinations.
1801 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1802 }
1803 } else {
1804 if (TraceCallFixup) {
1805 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1806 moop->print_short_name(tty);
1807 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1808 }
1809 }
1810 return false;
1811 }
1812
1813 // ---------------------------------------------------------------------------
1814 // We are calling the interpreter via a c2i. Normally this would mean that
1815 // we were called by a compiled method. However we could have lost a race
1816 // where we went int -> i2c -> c2i and so the caller could in fact be
1817 // interpreted. If the caller is compiled we attempt to patch the caller
1818 // so he no longer calls into the interpreter.
1819 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1820 Method* moop(method);
1821
1822 address entry_point = moop->from_compiled_entry_no_trampoline();
1823
1824 // It's possible that deoptimization can occur at a call site which hasn't
1825 // been resolved yet, in which case this function will be called from
1826 // an nmethod that has been patched for deopt and we can ignore the
1827 // request for a fixup.
1828 // Also it is possible that we lost a race in that from_compiled_entry
1829 // is now back to the i2c in that case we don't need to patch and if
1830 // we did we'd leap into space because the callsite needs to use
1831 // "to interpreter" stub in order to load up the Method*. Don't
1832 // ask me how I know this...
1833
1834 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1835 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) {
1836 return;
1837 }
1838
1839 // The check above makes sure this is a nmethod.
1840 CompiledMethod* nm = cb->as_compiled_method_or_null();
1841 assert(nm, "must be");
1842
1843 // Get the return PC for the passed caller PC.
1844 address return_pc = caller_pc + frame::pc_return_offset;
1845
1846 // There is a benign race here. We could be attempting to patch to a compiled
1847 // entry point at the same time the callee is being deoptimized. If that is
1848 // the case then entry_point may in fact point to a c2i and we'd patch the
1849 // call site with the same old data. clear_code will set code() to NULL
1850 // at the end of it. If we happen to see that NULL then we can skip trying
1851 // to patch. If we hit the window where the callee has a c2i in the
1852 // from_compiled_entry and the NULL isn't present yet then we lose the race
1853 // and patch the code with the same old data. Asi es la vida.
1854
1855 if (moop->code() == NULL) return;
1856
1857 if (nm->is_in_use()) {
1858
1859 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1860 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1861 if (NativeCall::is_call_before(return_pc)) {
1862 ResourceMark mark;
1863 NativeCallWrapper* call = nm->call_wrapper_before(return_pc);
1864 //
1865 // bug 6281185. We might get here after resolving a call site to a vanilla
1866 // virtual call. Because the resolvee uses the verified entry it may then
1867 // see compiled code and attempt to patch the site by calling us. This would
1868 // then incorrectly convert the call site to optimized and its downhill from
1869 // there. If you're lucky you'll get the assert in the bugid, if not you've
1870 // just made a call site that could be megamorphic into a monomorphic site
1871 // for the rest of its life! Just another racing bug in the life of
1872 // fixup_callers_callsite ...
1873 //
1874 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1875 iter.next();
1876 assert(iter.has_current(), "must have a reloc at java call site");
1877 relocInfo::relocType typ = iter.reloc()->type();
1878 if (typ != relocInfo::static_call_type &&
1879 typ != relocInfo::opt_virtual_call_type &&
1880 typ != relocInfo::static_stub_type) {
1881 return;
1882 }
1883 address destination = call->destination();
1884 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) {
1885 call->set_destination_mt_safe(entry_point);
1886 }
1887 }
1888 }
1889 IRT_END
1890
1891
1892 // same as JVM_Arraycopy, but called directly from compiled code
1893 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1894 oopDesc* dest, jint dest_pos,
1895 jint length,
1896 JavaThread* thread)) {
1897 #ifndef PRODUCT
1898 _slow_array_copy_ctr++;
1899 #endif
1900 // Check if we have null pointers
1901 if (src == NULL || dest == NULL) {
1902 THROW(vmSymbols::java_lang_NullPointerException());
1903 }
1904 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1905 // even though the copy_array API also performs dynamic checks to ensure
1906 // that src and dest are truly arrays (and are conformable).
1907 // The copy_array mechanism is awkward and could be removed, but
1908 // the compilers don't call this function except as a last resort,
1909 // so it probably doesn't matter.
1910 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1911 (arrayOopDesc*)dest, dest_pos,
1912 length, thread);
1913 }
1914 JRT_END
1915
1916 // The caller of generate_class_cast_message() (or one of its callers)
1917 // must use a ResourceMark in order to correctly free the result.
1918 char* SharedRuntime::generate_class_cast_message(
1919 JavaThread* thread, Klass* caster_klass) {
1920
1921 // Get target class name from the checkcast instruction
1922 vframeStream vfst(thread, true);
1923 assert(!vfst.at_end(), "Java frame must exist");
1924 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1925 constantPoolHandle cpool(thread, vfst.method()->constants());
1926 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1927 Symbol* target_klass_name = NULL;
1928 if (target_klass == NULL) {
1929 // This klass should be resolved, but just in case, get the name in the klass slot.
1930 target_klass_name = cpool->klass_name_at(cc.index());
1931 }
1932 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1933 }
1934
1935
1936 // The caller of generate_class_cast_message() (or one of its callers)
1937 // must use a ResourceMark in order to correctly free the result.
1938 char* SharedRuntime::generate_class_cast_message(
1939 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1940
1941 const char* caster_name = caster_klass->class_loader_and_module_name();
1942
1943 assert(target_klass != NULL || target_klass_name != NULL, "one must be provided");
1944 const char* target_name = target_klass == NULL ? target_klass_name->as_C_string() :
1945 target_klass->class_loader_and_module_name();
1946
1947 size_t msglen = strlen(caster_name) + strlen(" cannot be cast to ") + strlen(target_name) + 1;
1948
1949 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1950 if (message == NULL) {
1951 // Shouldn't happen, but don't cause even more problems if it does
1952 message = const_cast<char*>(caster_klass->external_name());
1953 } else {
1954 jio_snprintf(message,
1955 msglen,
1956 "%s cannot be cast to %s",
1957 caster_name,
1958 target_name);
1959 }
1960 return message;
1961 }
1962
1963 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1964 (void) JavaThread::current()->reguard_stack();
1965 JRT_END
1966
1967
1968 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1969 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1970 // Disable ObjectSynchronizer::quick_enter() in default config
1971 // on AARCH64 and ARM until JDK-8153107 is resolved.
1972 if (ARM_ONLY((SyncFlags & 256) != 0 &&)
1973 AARCH64_ONLY((SyncFlags & 256) != 0 &&)
1974 !SafepointSynchronize::is_synchronizing()) {
1975 // Only try quick_enter() if we're not trying to reach a safepoint
1976 // so that the calling thread reaches the safepoint more quickly.
1977 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return;
1978 }
1979 // NO_ASYNC required because an async exception on the state transition destructor
1980 // would leave you with the lock held and it would never be released.
1981 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1982 // and the model is that an exception implies the method failed.
1983 JRT_BLOCK_NO_ASYNC
1984 oop obj(_obj);
1985 if (PrintBiasedLockingStatistics) {
1986 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1987 }
1988 Handle h_obj(THREAD, obj);
1989 if (UseBiasedLocking) {
1990 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1991 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1992 } else {
1993 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1994 }
1995 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1996 JRT_BLOCK_END
1997 JRT_END
1998
1999 // Handles the uncommon cases of monitor unlocking in compiled code
2000 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD))
2001 oop obj(_obj);
2002 assert(JavaThread::current() == THREAD, "invariant");
2003 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
2004 // testing was unable to ever fire the assert that guarded it so I have removed it.
2005 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
2006 #undef MIGHT_HAVE_PENDING
2007 #ifdef MIGHT_HAVE_PENDING
2008 // Save and restore any pending_exception around the exception mark.
2009 // While the slow_exit must not throw an exception, we could come into
2010 // this routine with one set.
2011 oop pending_excep = NULL;
2012 const char* pending_file;
2013 int pending_line;
2014 if (HAS_PENDING_EXCEPTION) {
2015 pending_excep = PENDING_EXCEPTION;
2016 pending_file = THREAD->exception_file();
2017 pending_line = THREAD->exception_line();
2018 CLEAR_PENDING_EXCEPTION;
2019 }
2020 #endif /* MIGHT_HAVE_PENDING */
2021
2022 {
2023 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2024 EXCEPTION_MARK;
2025 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
2026 }
2027
2028 #ifdef MIGHT_HAVE_PENDING
2029 if (pending_excep != NULL) {
2030 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
2031 }
2032 #endif /* MIGHT_HAVE_PENDING */
2033 JRT_END
2034
2035 #ifndef PRODUCT
2036
2037 void SharedRuntime::print_statistics() {
2038 ttyLocker ttyl;
2039 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
2040
2041 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
2042
2043 SharedRuntime::print_ic_miss_histogram();
2044
2045 if (CountRemovableExceptions) {
2046 if (_nof_removable_exceptions > 0) {
2047 Unimplemented(); // this counter is not yet incremented
2048 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
2049 }
2050 }
2051
2052 // Dump the JRT_ENTRY counters
2053 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
2054 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr);
2055 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
2056 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
2057 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
2058 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
2059 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
2060
2061 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr);
2062 tty->print_cr("%5d wrong method", _wrong_method_ctr);
2063 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr);
2064 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr);
2065 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2066
2067 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr);
2068 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr);
2069 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr);
2070 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr);
2071 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr);
2072 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr);
2073 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr);
2074 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr);
2075 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr);
2076 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr);
2077 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr);
2078 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr);
2079 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr);
2080 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr);
2081 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr);
2082 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr);
2083
2084 AdapterHandlerLibrary::print_statistics();
2085
2086 if (xtty != NULL) xtty->tail("statistics");
2087 }
2088
2089 inline double percent(int x, int y) {
2090 return 100.0 * x / MAX2(y, 1);
2091 }
2092
2093 class MethodArityHistogram {
2094 public:
2095 enum { MAX_ARITY = 256 };
2096 private:
2097 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2098 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2099 static int _max_arity; // max. arity seen
2100 static int _max_size; // max. arg size seen
2101
2102 static void add_method_to_histogram(nmethod* nm) {
2103 Method* m = nm->method();
2104 ArgumentCount args(m->signature());
2105 int arity = args.size() + (m->is_static() ? 0 : 1);
2106 int argsize = m->size_of_parameters();
2107 arity = MIN2(arity, MAX_ARITY-1);
2108 argsize = MIN2(argsize, MAX_ARITY-1);
2109 int count = nm->method()->compiled_invocation_count();
2110 _arity_histogram[arity] += count;
2111 _size_histogram[argsize] += count;
2112 _max_arity = MAX2(_max_arity, arity);
2113 _max_size = MAX2(_max_size, argsize);
2114 }
2115
2116 void print_histogram_helper(int n, int* histo, const char* name) {
2117 const int N = MIN2(5, n);
2118 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2119 double sum = 0;
2120 double weighted_sum = 0;
2121 int i;
2122 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2123 double rest = sum;
2124 double percent = sum / 100;
2125 for (i = 0; i <= N; i++) {
2126 rest -= histo[i];
2127 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2128 }
2129 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2130 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2131 }
2132
2133 void print_histogram() {
2134 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2135 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2136 tty->print_cr("\nSame for parameter size (in words):");
2137 print_histogram_helper(_max_size, _size_histogram, "size");
2138 tty->cr();
2139 }
2140
2141 public:
2142 MethodArityHistogram() {
2143 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2144 _max_arity = _max_size = 0;
2145 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2146 CodeCache::nmethods_do(add_method_to_histogram);
2147 print_histogram();
2148 }
2149 };
2150
2151 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2152 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2153 int MethodArityHistogram::_max_arity;
2154 int MethodArityHistogram::_max_size;
2155
2156 void SharedRuntime::print_call_statistics(int comp_total) {
2157 tty->print_cr("Calls from compiled code:");
2158 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2159 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2160 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2161 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2162 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2163 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2164 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2165 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2166 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2167 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2168 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2169 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2170 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2171 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2172 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2173 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2174 tty->cr();
2175 tty->print_cr("Note 1: counter updates are not MT-safe.");
2176 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2177 tty->print_cr(" %% in nested categories are relative to their category");
2178 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2179 tty->cr();
2180
2181 MethodArityHistogram h;
2182 }
2183 #endif
2184
2185
2186 // A simple wrapper class around the calling convention information
2187 // that allows sharing of adapters for the same calling convention.
2188 class AdapterFingerPrint : public CHeapObj<mtCode> {
2189 private:
2190 enum {
2191 _basic_type_bits = 4,
2192 _basic_type_mask = right_n_bits(_basic_type_bits),
2193 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2194 _compact_int_count = 3
2195 };
2196 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2197 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2198
2199 union {
2200 int _compact[_compact_int_count];
2201 int* _fingerprint;
2202 } _value;
2203 int _length; // A negative length indicates the fingerprint is in the compact form,
2204 // Otherwise _value._fingerprint is the array.
2205
2206 // Remap BasicTypes that are handled equivalently by the adapters.
2207 // These are correct for the current system but someday it might be
2208 // necessary to make this mapping platform dependent.
2209 static int adapter_encoding(BasicType in) {
2210 switch (in) {
2211 case T_BOOLEAN:
2212 case T_BYTE:
2213 case T_SHORT:
2214 case T_CHAR:
2215 // There are all promoted to T_INT in the calling convention
2216 return T_INT;
2217
2218 case T_OBJECT:
2219 case T_ARRAY:
2220 // In other words, we assume that any register good enough for
2221 // an int or long is good enough for a managed pointer.
2222 #ifdef _LP64
2223 return T_LONG;
2224 #else
2225 return T_INT;
2226 #endif
2227
2228 case T_INT:
2229 case T_LONG:
2230 case T_FLOAT:
2231 case T_DOUBLE:
2232 case T_VOID:
2233 return in;
2234
2235 default:
2236 ShouldNotReachHere();
2237 return T_CONFLICT;
2238 }
2239 }
2240
2241 public:
2242 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2243 // The fingerprint is based on the BasicType signature encoded
2244 // into an array of ints with eight entries per int.
2245 int* ptr;
2246 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2247 if (len <= _compact_int_count) {
2248 assert(_compact_int_count == 3, "else change next line");
2249 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2250 // Storing the signature encoded as signed chars hits about 98%
2251 // of the time.
2252 _length = -len;
2253 ptr = _value._compact;
2254 } else {
2255 _length = len;
2256 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2257 ptr = _value._fingerprint;
2258 }
2259
2260 // Now pack the BasicTypes with 8 per int
2261 int sig_index = 0;
2262 for (int index = 0; index < len; index++) {
2263 int value = 0;
2264 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2265 int bt = ((sig_index < total_args_passed)
2266 ? adapter_encoding(sig_bt[sig_index++])
2267 : 0);
2268 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2269 value = (value << _basic_type_bits) | bt;
2270 }
2271 ptr[index] = value;
2272 }
2273 }
2274
2275 ~AdapterFingerPrint() {
2276 if (_length > 0) {
2277 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2278 }
2279 }
2280
2281 int value(int index) {
2282 if (_length < 0) {
2283 return _value._compact[index];
2284 }
2285 return _value._fingerprint[index];
2286 }
2287 int length() {
2288 if (_length < 0) return -_length;
2289 return _length;
2290 }
2291
2292 bool is_compact() {
2293 return _length <= 0;
2294 }
2295
2296 unsigned int compute_hash() {
2297 int hash = 0;
2298 for (int i = 0; i < length(); i++) {
2299 int v = value(i);
2300 hash = (hash << 8) ^ v ^ (hash >> 5);
2301 }
2302 return (unsigned int)hash;
2303 }
2304
2305 const char* as_string() {
2306 stringStream st;
2307 st.print("0x");
2308 for (int i = 0; i < length(); i++) {
2309 st.print("%08x", value(i));
2310 }
2311 return st.as_string();
2312 }
2313
2314 bool equals(AdapterFingerPrint* other) {
2315 if (other->_length != _length) {
2316 return false;
2317 }
2318 if (_length < 0) {
2319 assert(_compact_int_count == 3, "else change next line");
2320 return _value._compact[0] == other->_value._compact[0] &&
2321 _value._compact[1] == other->_value._compact[1] &&
2322 _value._compact[2] == other->_value._compact[2];
2323 } else {
2324 for (int i = 0; i < _length; i++) {
2325 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2326 return false;
2327 }
2328 }
2329 }
2330 return true;
2331 }
2332 };
2333
2334
2335 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2336 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2337 friend class AdapterHandlerTableIterator;
2338
2339 private:
2340
2341 #ifndef PRODUCT
2342 static int _lookups; // number of calls to lookup
2343 static int _buckets; // number of buckets checked
2344 static int _equals; // number of buckets checked with matching hash
2345 static int _hits; // number of successful lookups
2346 static int _compact; // number of equals calls with compact signature
2347 #endif
2348
2349 AdapterHandlerEntry* bucket(int i) {
2350 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2351 }
2352
2353 public:
2354 AdapterHandlerTable()
2355 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { }
2356
2357 // Create a new entry suitable for insertion in the table
2358 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2359 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2360 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2361 if (DumpSharedSpaces) {
2362 ((CDSAdapterHandlerEntry*)entry)->init();
2363 }
2364 return entry;
2365 }
2366
2367 // Insert an entry into the table
2368 void add(AdapterHandlerEntry* entry) {
2369 int index = hash_to_index(entry->hash());
2370 add_entry(index, entry);
2371 }
2372
2373 void free_entry(AdapterHandlerEntry* entry) {
2374 entry->deallocate();
2375 BasicHashtable<mtCode>::free_entry(entry);
2376 }
2377
2378 // Find a entry with the same fingerprint if it exists
2379 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2380 NOT_PRODUCT(_lookups++);
2381 AdapterFingerPrint fp(total_args_passed, sig_bt);
2382 unsigned int hash = fp.compute_hash();
2383 int index = hash_to_index(hash);
2384 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2385 NOT_PRODUCT(_buckets++);
2386 if (e->hash() == hash) {
2387 NOT_PRODUCT(_equals++);
2388 if (fp.equals(e->fingerprint())) {
2389 #ifndef PRODUCT
2390 if (fp.is_compact()) _compact++;
2391 _hits++;
2392 #endif
2393 return e;
2394 }
2395 }
2396 }
2397 return NULL;
2398 }
2399
2400 #ifndef PRODUCT
2401 void print_statistics() {
2402 ResourceMark rm;
2403 int longest = 0;
2404 int empty = 0;
2405 int total = 0;
2406 int nonempty = 0;
2407 for (int index = 0; index < table_size(); index++) {
2408 int count = 0;
2409 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2410 count++;
2411 }
2412 if (count != 0) nonempty++;
2413 if (count == 0) empty++;
2414 if (count > longest) longest = count;
2415 total += count;
2416 }
2417 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2418 empty, longest, total, total / (double)nonempty);
2419 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2420 _lookups, _buckets, _equals, _hits, _compact);
2421 }
2422 #endif
2423 };
2424
2425
2426 #ifndef PRODUCT
2427
2428 int AdapterHandlerTable::_lookups;
2429 int AdapterHandlerTable::_buckets;
2430 int AdapterHandlerTable::_equals;
2431 int AdapterHandlerTable::_hits;
2432 int AdapterHandlerTable::_compact;
2433
2434 #endif
2435
2436 class AdapterHandlerTableIterator : public StackObj {
2437 private:
2438 AdapterHandlerTable* _table;
2439 int _index;
2440 AdapterHandlerEntry* _current;
2441
2442 void scan() {
2443 while (_index < _table->table_size()) {
2444 AdapterHandlerEntry* a = _table->bucket(_index);
2445 _index++;
2446 if (a != NULL) {
2447 _current = a;
2448 return;
2449 }
2450 }
2451 }
2452
2453 public:
2454 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2455 scan();
2456 }
2457 bool has_next() {
2458 return _current != NULL;
2459 }
2460 AdapterHandlerEntry* next() {
2461 if (_current != NULL) {
2462 AdapterHandlerEntry* result = _current;
2463 _current = _current->next();
2464 if (_current == NULL) scan();
2465 return result;
2466 } else {
2467 return NULL;
2468 }
2469 }
2470 };
2471
2472
2473 // ---------------------------------------------------------------------------
2474 // Implementation of AdapterHandlerLibrary
2475 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2476 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2477 const int AdapterHandlerLibrary_size = 16*K;
2478 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2479
2480 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2481 // Should be called only when AdapterHandlerLibrary_lock is active.
2482 if (_buffer == NULL) // Initialize lazily
2483 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2484 return _buffer;
2485 }
2486
2487 extern "C" void unexpected_adapter_call() {
2488 ShouldNotCallThis();
2489 }
2490
2491 void AdapterHandlerLibrary::initialize() {
2492 if (_adapters != NULL) return;
2493 _adapters = new AdapterHandlerTable();
2494
2495 // Create a special handler for abstract methods. Abstract methods
2496 // are never compiled so an i2c entry is somewhat meaningless, but
2497 // throw AbstractMethodError just in case.
2498 // Pass wrong_method_abstract for the c2i transitions to return
2499 // AbstractMethodError for invalid invocations.
2500 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2501 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2502 StubRoutines::throw_AbstractMethodError_entry(),
2503 wrong_method_abstract, wrong_method_abstract);
2504 }
2505
2506 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2507 address i2c_entry,
2508 address c2i_entry,
2509 address c2i_unverified_entry) {
2510 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2511 }
2512
2513 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2514 AdapterHandlerEntry* entry = get_adapter0(method);
2515 if (method->is_shared()) {
2516 // See comments around Method::link_method()
2517 MutexLocker mu(AdapterHandlerLibrary_lock);
2518 if (method->adapter() == NULL) {
2519 method->update_adapter_trampoline(entry);
2520 }
2521 address trampoline = method->from_compiled_entry();
2522 if (*(int*)trampoline == 0) {
2523 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size());
2524 MacroAssembler _masm(&buffer);
2525 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry());
2526 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros.");
2527
2528 if (PrintInterpreter) {
2529 Disassembler::decode(buffer.insts_begin(), buffer.insts_end());
2530 }
2531 }
2532 }
2533
2534 return entry;
2535 }
2536
2537 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) {
2538 // Use customized signature handler. Need to lock around updates to
2539 // the AdapterHandlerTable (it is not safe for concurrent readers
2540 // and a single writer: this could be fixed if it becomes a
2541 // problem).
2542
2543 ResourceMark rm;
2544
2545 NOT_PRODUCT(int insts_size);
2546 AdapterBlob* new_adapter = NULL;
2547 AdapterHandlerEntry* entry = NULL;
2548 AdapterFingerPrint* fingerprint = NULL;
2549 {
2550 MutexLocker mu(AdapterHandlerLibrary_lock);
2551 // make sure data structure is initialized
2552 initialize();
2553
2554 if (method->is_abstract()) {
2555 return _abstract_method_handler;
2556 }
2557
2558 // Fill in the signature array, for the calling-convention call.
2559 int total_args_passed = method->size_of_parameters(); // All args on stack
2560
2561 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2562 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2563 int i = 0;
2564 if (!method->is_static()) // Pass in receiver first
2565 sig_bt[i++] = T_OBJECT;
2566 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2567 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2568 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2569 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2570 }
2571 assert(i == total_args_passed, "");
2572
2573 // Lookup method signature's fingerprint
2574 entry = _adapters->lookup(total_args_passed, sig_bt);
2575
2576 #ifdef ASSERT
2577 AdapterHandlerEntry* shared_entry = NULL;
2578 // Start adapter sharing verification only after the VM is booted.
2579 if (VerifyAdapterSharing && (entry != NULL)) {
2580 shared_entry = entry;
2581 entry = NULL;
2582 }
2583 #endif
2584
2585 if (entry != NULL) {
2586 return entry;
2587 }
2588
2589 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2590 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2591
2592 // Make a C heap allocated version of the fingerprint to store in the adapter
2593 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2594
2595 // StubRoutines::code2() is initialized after this function can be called. As a result,
2596 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2597 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2598 // stub that ensure that an I2C stub is called from an interpreter frame.
2599 bool contains_all_checks = StubRoutines::code2() != NULL;
2600
2601 // Create I2C & C2I handlers
2602 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2603 if (buf != NULL) {
2604 CodeBuffer buffer(buf);
2605 short buffer_locs[20];
2606 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2607 sizeof(buffer_locs)/sizeof(relocInfo));
2608
2609 MacroAssembler _masm(&buffer);
2610 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2611 total_args_passed,
2612 comp_args_on_stack,
2613 sig_bt,
2614 regs,
2615 fingerprint);
2616 #ifdef ASSERT
2617 if (VerifyAdapterSharing) {
2618 if (shared_entry != NULL) {
2619 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2620 // Release the one just created and return the original
2621 _adapters->free_entry(entry);
2622 return shared_entry;
2623 } else {
2624 entry->save_code(buf->code_begin(), buffer.insts_size());
2625 }
2626 }
2627 #endif
2628
2629 new_adapter = AdapterBlob::create(&buffer);
2630 NOT_PRODUCT(insts_size = buffer.insts_size());
2631 }
2632 if (new_adapter == NULL) {
2633 // CodeCache is full, disable compilation
2634 // Ought to log this but compile log is only per compile thread
2635 // and we're some non descript Java thread.
2636 return NULL; // Out of CodeCache space
2637 }
2638 entry->relocate(new_adapter->content_begin());
2639 #ifndef PRODUCT
2640 // debugging suppport
2641 if (PrintAdapterHandlers || PrintStubCode) {
2642 ttyLocker ttyl;
2643 entry->print_adapter_on(tty);
2644 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)",
2645 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2646 method->signature()->as_C_string(), fingerprint->as_string(), insts_size);
2647 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
2648 if (Verbose || PrintStubCode) {
2649 address first_pc = entry->base_address();
2650 if (first_pc != NULL) {
2651 Disassembler::decode(first_pc, first_pc + insts_size);
2652 tty->cr();
2653 }
2654 }
2655 }
2656 #endif
2657 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2658 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2659 if (contains_all_checks || !VerifyAdapterCalls) {
2660 _adapters->add(entry);
2661 }
2662 }
2663 // Outside of the lock
2664 if (new_adapter != NULL) {
2665 char blob_id[256];
2666 jio_snprintf(blob_id,
2667 sizeof(blob_id),
2668 "%s(%s)@" PTR_FORMAT,
2669 new_adapter->name(),
2670 fingerprint->as_string(),
2671 new_adapter->content_begin());
2672 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2673
2674 if (JvmtiExport::should_post_dynamic_code_generated()) {
2675 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2676 }
2677 }
2678 return entry;
2679 }
2680
2681 address AdapterHandlerEntry::base_address() {
2682 address base = _i2c_entry;
2683 if (base == NULL) base = _c2i_entry;
2684 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2685 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2686 return base;
2687 }
2688
2689 void AdapterHandlerEntry::relocate(address new_base) {
2690 address old_base = base_address();
2691 assert(old_base != NULL, "");
2692 ptrdiff_t delta = new_base - old_base;
2693 if (_i2c_entry != NULL)
2694 _i2c_entry += delta;
2695 if (_c2i_entry != NULL)
2696 _c2i_entry += delta;
2697 if (_c2i_unverified_entry != NULL)
2698 _c2i_unverified_entry += delta;
2699 assert(base_address() == new_base, "");
2700 }
2701
2702
2703 void AdapterHandlerEntry::deallocate() {
2704 delete _fingerprint;
2705 #ifdef ASSERT
2706 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2707 #endif
2708 }
2709
2710
2711 #ifdef ASSERT
2712 // Capture the code before relocation so that it can be compared
2713 // against other versions. If the code is captured after relocation
2714 // then relative instructions won't be equivalent.
2715 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2716 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2717 _saved_code_length = length;
2718 memcpy(_saved_code, buffer, length);
2719 }
2720
2721
2722 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2723 if (length != _saved_code_length) {
2724 return false;
2725 }
2726
2727 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2728 }
2729 #endif
2730
2731
2732 /**
2733 * Create a native wrapper for this native method. The wrapper converts the
2734 * Java-compiled calling convention to the native convention, handles
2735 * arguments, and transitions to native. On return from the native we transition
2736 * back to java blocking if a safepoint is in progress.
2737 */
2738 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2739 ResourceMark rm;
2740 nmethod* nm = NULL;
2741
2742 assert(method->is_native(), "must be native");
2743 assert(method->is_method_handle_intrinsic() ||
2744 method->has_native_function(), "must have something valid to call!");
2745
2746 {
2747 // Perform the work while holding the lock, but perform any printing outside the lock
2748 MutexLocker mu(AdapterHandlerLibrary_lock);
2749 // See if somebody beat us to it
2750 if (method->code() != NULL) {
2751 return;
2752 }
2753
2754 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2755 assert(compile_id > 0, "Must generate native wrapper");
2756
2757
2758 ResourceMark rm;
2759 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2760 if (buf != NULL) {
2761 CodeBuffer buffer(buf);
2762 double locs_buf[20];
2763 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2764 MacroAssembler _masm(&buffer);
2765
2766 // Fill in the signature array, for the calling-convention call.
2767 const int total_args_passed = method->size_of_parameters();
2768
2769 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2770 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2771 int i=0;
2772 if (!method->is_static()) // Pass in receiver first
2773 sig_bt[i++] = T_OBJECT;
2774 SignatureStream ss(method->signature());
2775 for (; !ss.at_return_type(); ss.next()) {
2776 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2777 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2778 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2779 }
2780 assert(i == total_args_passed, "");
2781 BasicType ret_type = ss.type();
2782
2783 // Now get the compiled-Java layout as input (or output) arguments.
2784 // NOTE: Stubs for compiled entry points of method handle intrinsics
2785 // are just trampolines so the argument registers must be outgoing ones.
2786 const bool is_outgoing = method->is_method_handle_intrinsic();
2787 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2788
2789 // Generate the compiled-to-native wrapper code
2790 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2791
2792 if (nm != NULL) {
2793 method->set_code(method, nm);
2794
2795 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
2796 if (directive->PrintAssemblyOption) {
2797 nm->print_code();
2798 }
2799 DirectivesStack::release(directive);
2800 }
2801 }
2802 } // Unlock AdapterHandlerLibrary_lock
2803
2804
2805 // Install the generated code.
2806 if (nm != NULL) {
2807 const char *msg = method->is_static() ? "(static)" : "";
2808 CompileTask::print_ul(nm, msg);
2809 if (PrintCompilation) {
2810 ttyLocker ttyl;
2811 CompileTask::print(tty, nm, msg);
2812 }
2813 nm->post_compiled_method_load_event();
2814 }
2815 }
2816
2817 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2818 assert(thread == JavaThread::current(), "must be");
2819 // The code is about to enter a JNI lazy critical native method and
2820 // _needs_gc is true, so if this thread is already in a critical
2821 // section then just return, otherwise this thread should block
2822 // until needs_gc has been cleared.
2823 if (thread->in_critical()) {
2824 return;
2825 }
2826 // Lock and unlock a critical section to give the system a chance to block
2827 GCLocker::lock_critical(thread);
2828 GCLocker::unlock_critical(thread);
2829 JRT_END
2830
2831 // -------------------------------------------------------------------------
2832 // Java-Java calling convention
2833 // (what you use when Java calls Java)
2834
2835 //------------------------------name_for_receiver----------------------------------
2836 // For a given signature, return the VMReg for parameter 0.
2837 VMReg SharedRuntime::name_for_receiver() {
2838 VMRegPair regs;
2839 BasicType sig_bt = T_OBJECT;
2840 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2841 // Return argument 0 register. In the LP64 build pointers
2842 // take 2 registers, but the VM wants only the 'main' name.
2843 return regs.first();
2844 }
2845
2846 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2847 // This method is returning a data structure allocating as a
2848 // ResourceObject, so do not put any ResourceMarks in here.
2849 char *s = sig->as_C_string();
2850 int len = (int)strlen(s);
2851 s++; len--; // Skip opening paren
2852
2853 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2854 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2855 int cnt = 0;
2856 if (has_receiver) {
2857 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2858 }
2859
2860 while (*s != ')') { // Find closing right paren
2861 switch (*s++) { // Switch on signature character
2862 case 'B': sig_bt[cnt++] = T_BYTE; break;
2863 case 'C': sig_bt[cnt++] = T_CHAR; break;
2864 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2865 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2866 case 'I': sig_bt[cnt++] = T_INT; break;
2867 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2868 case 'S': sig_bt[cnt++] = T_SHORT; break;
2869 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2870 case 'V': sig_bt[cnt++] = T_VOID; break;
2871 case 'L': // Oop
2872 while (*s++ != ';'); // Skip signature
2873 sig_bt[cnt++] = T_OBJECT;
2874 break;
2875 case '[': { // Array
2876 do { // Skip optional size
2877 while (*s >= '0' && *s <= '9') s++;
2878 } while (*s++ == '['); // Nested arrays?
2879 // Skip element type
2880 if (s[-1] == 'L')
2881 while (*s++ != ';'); // Skip signature
2882 sig_bt[cnt++] = T_ARRAY;
2883 break;
2884 }
2885 default : ShouldNotReachHere();
2886 }
2887 }
2888
2889 if (has_appendix) {
2890 sig_bt[cnt++] = T_OBJECT;
2891 }
2892
2893 assert(cnt < 256, "grow table size");
2894
2895 int comp_args_on_stack;
2896 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2897
2898 // the calling convention doesn't count out_preserve_stack_slots so
2899 // we must add that in to get "true" stack offsets.
2900
2901 if (comp_args_on_stack) {
2902 for (int i = 0; i < cnt; i++) {
2903 VMReg reg1 = regs[i].first();
2904 if (reg1->is_stack()) {
2905 // Yuck
2906 reg1 = reg1->bias(out_preserve_stack_slots());
2907 }
2908 VMReg reg2 = regs[i].second();
2909 if (reg2->is_stack()) {
2910 // Yuck
2911 reg2 = reg2->bias(out_preserve_stack_slots());
2912 }
2913 regs[i].set_pair(reg2, reg1);
2914 }
2915 }
2916
2917 // results
2918 *arg_size = cnt;
2919 return regs;
2920 }
2921
2922 // OSR Migration Code
2923 //
2924 // This code is used convert interpreter frames into compiled frames. It is
2925 // called from very start of a compiled OSR nmethod. A temp array is
2926 // allocated to hold the interesting bits of the interpreter frame. All
2927 // active locks are inflated to allow them to move. The displaced headers and
2928 // active interpreter locals are copied into the temp buffer. Then we return
2929 // back to the compiled code. The compiled code then pops the current
2930 // interpreter frame off the stack and pushes a new compiled frame. Then it
2931 // copies the interpreter locals and displaced headers where it wants.
2932 // Finally it calls back to free the temp buffer.
2933 //
2934 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2935
2936 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2937
2938 //
2939 // This code is dependent on the memory layout of the interpreter local
2940 // array and the monitors. On all of our platforms the layout is identical
2941 // so this code is shared. If some platform lays the their arrays out
2942 // differently then this code could move to platform specific code or
2943 // the code here could be modified to copy items one at a time using
2944 // frame accessor methods and be platform independent.
2945
2946 frame fr = thread->last_frame();
2947 assert(fr.is_interpreted_frame(), "");
2948 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
2949
2950 // Figure out how many monitors are active.
2951 int active_monitor_count = 0;
2952 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2953 kptr < fr.interpreter_frame_monitor_begin();
2954 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2955 if (kptr->obj() != NULL) active_monitor_count++;
2956 }
2957
2958 // QQQ we could place number of active monitors in the array so that compiled code
2959 // could double check it.
2960
2961 Method* moop = fr.interpreter_frame_method();
2962 int max_locals = moop->max_locals();
2963 // Allocate temp buffer, 1 word per local & 2 per active monitor
2964 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
2965 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2966
2967 // Copy the locals. Order is preserved so that loading of longs works.
2968 // Since there's no GC I can copy the oops blindly.
2969 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2970 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2971 (HeapWord*)&buf[0],
2972 max_locals);
2973
2974 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2975 int i = max_locals;
2976 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2977 kptr2 < fr.interpreter_frame_monitor_begin();
2978 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2979 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2980 BasicLock *lock = kptr2->lock();
2981 // Inflate so the displaced header becomes position-independent
2982 if (lock->displaced_header()->is_unlocked())
2983 ObjectSynchronizer::inflate_helper(kptr2->obj());
2984 // Now the displaced header is free to move
2985 buf[i++] = (intptr_t)lock->displaced_header();
2986 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2987 }
2988 }
2989 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
2990
2991 return buf;
2992 JRT_END
2993
2994 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2995 FREE_C_HEAP_ARRAY(intptr_t, buf);
2996 JRT_END
2997
2998 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
2999 AdapterHandlerTableIterator iter(_adapters);
3000 while (iter.has_next()) {
3001 AdapterHandlerEntry* a = iter.next();
3002 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true;
3003 }
3004 return false;
3005 }
3006
3007 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3008 AdapterHandlerTableIterator iter(_adapters);
3009 while (iter.has_next()) {
3010 AdapterHandlerEntry* a = iter.next();
3011 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3012 st->print("Adapter for signature: ");
3013 a->print_adapter_on(tty);
3014 return;
3015 }
3016 }
3017 assert(false, "Should have found handler");
3018 }
3019
3020 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3021 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
3022 p2i(this), fingerprint()->as_string(),
3023 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry()));
3024
3025 }
3026
3027 #if INCLUDE_CDS
3028
3029 void CDSAdapterHandlerEntry::init() {
3030 assert(DumpSharedSpaces, "used during dump time only");
3031 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size());
3032 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*));
3033 };
3034
3035 #endif // INCLUDE_CDS
3036
3037
3038 #ifndef PRODUCT
3039
3040 void AdapterHandlerLibrary::print_statistics() {
3041 _adapters->print_statistics();
3042 }
3043
3044 #endif /* PRODUCT */
3045
3046 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread))
3047 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone");
3048 if (thread->stack_reserved_zone_disabled()) {
3049 thread->enable_stack_reserved_zone();
3050 }
3051 thread->set_reserved_stack_activation(thread->stack_base());
3052 JRT_END
3053
3054 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) {
3055 ResourceMark rm(thread);
3056 frame activation;
3057 CompiledMethod* nm = NULL;
3058 int count = 1;
3059
3060 assert(fr.is_java_frame(), "Must start on Java frame");
3061
3062 while (true) {
3063 Method* method = NULL;
3064 bool found = false;
3065 if (fr.is_interpreted_frame()) {
3066 method = fr.interpreter_frame_method();
3067 if (method != NULL && method->has_reserved_stack_access()) {
3068 found = true;
3069 }
3070 } else {
3071 CodeBlob* cb = fr.cb();
3072 if (cb != NULL && cb->is_compiled()) {
3073 nm = cb->as_compiled_method();
3074 method = nm->method();
3075 // scope_desc_near() must be used, instead of scope_desc_at() because on
3076 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3077 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) {
3078 method = sd->method();
3079 if (method != NULL && method->has_reserved_stack_access()) {
3080 found = true;
3081 }
3082 }
3083 }
3084 }
3085 if (found) {
3086 activation = fr;
3087 warning("Potentially dangerous stack overflow in "
3088 "ReservedStackAccess annotated method %s [%d]",
3089 method->name_and_sig_as_C_string(), count++);
3090 EventReservedStackActivation event;
3091 if (event.should_commit()) {
3092 event.set_method(method);
3093 event.commit();
3094 }
3095 }
3096 if (fr.is_first_java_frame()) {
3097 break;
3098 } else {
3099 fr = fr.java_sender();
3100 }
3101 }
3102 return activation;
3103 }
3104
3105 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* thread) {
3106 // After any safepoint, just before going back to compiled code,
3107 // we inform the GC that we will be doing initializing writes to
3108 // this object in the future without emitting card-marks, so
3109 // GC may take any compensating steps.
3110
3111 oop new_obj = thread->vm_result();
3112 if (new_obj == NULL) return;
3113
3114 BarrierSet *bs = Universe::heap()->barrier_set();
3115 bs->on_slowpath_allocation_exit(thread, new_obj);
3116 }