1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_sharedRuntime.cpp.incl"
27 #include <math.h>
28
29 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t);
30 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int,
31 char*, int, char*, int, char*, int);
32 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int,
33 char*, int, char*, int, char*, int);
34
35 // Implementation of SharedRuntime
36
37 #ifndef PRODUCT
38 // For statistics
39 int SharedRuntime::_ic_miss_ctr = 0;
40 int SharedRuntime::_wrong_method_ctr = 0;
41 int SharedRuntime::_resolve_static_ctr = 0;
42 int SharedRuntime::_resolve_virtual_ctr = 0;
43 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
44 int SharedRuntime::_implicit_null_throws = 0;
45 int SharedRuntime::_implicit_div0_throws = 0;
46 int SharedRuntime::_throw_null_ctr = 0;
47
48 int SharedRuntime::_nof_normal_calls = 0;
49 int SharedRuntime::_nof_optimized_calls = 0;
50 int SharedRuntime::_nof_inlined_calls = 0;
51 int SharedRuntime::_nof_megamorphic_calls = 0;
52 int SharedRuntime::_nof_static_calls = 0;
53 int SharedRuntime::_nof_inlined_static_calls = 0;
54 int SharedRuntime::_nof_interface_calls = 0;
55 int SharedRuntime::_nof_optimized_interface_calls = 0;
56 int SharedRuntime::_nof_inlined_interface_calls = 0;
57 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
58 int SharedRuntime::_nof_removable_exceptions = 0;
59
60 int SharedRuntime::_new_instance_ctr=0;
61 int SharedRuntime::_new_array_ctr=0;
62 int SharedRuntime::_multi1_ctr=0;
63 int SharedRuntime::_multi2_ctr=0;
64 int SharedRuntime::_multi3_ctr=0;
65 int SharedRuntime::_multi4_ctr=0;
66 int SharedRuntime::_multi5_ctr=0;
67 int SharedRuntime::_mon_enter_stub_ctr=0;
68 int SharedRuntime::_mon_exit_stub_ctr=0;
69 int SharedRuntime::_mon_enter_ctr=0;
70 int SharedRuntime::_mon_exit_ctr=0;
71 int SharedRuntime::_partial_subtype_ctr=0;
72 int SharedRuntime::_jbyte_array_copy_ctr=0;
73 int SharedRuntime::_jshort_array_copy_ctr=0;
74 int SharedRuntime::_jint_array_copy_ctr=0;
75 int SharedRuntime::_jlong_array_copy_ctr=0;
76 int SharedRuntime::_oop_array_copy_ctr=0;
77 int SharedRuntime::_checkcast_array_copy_ctr=0;
78 int SharedRuntime::_unsafe_array_copy_ctr=0;
79 int SharedRuntime::_generic_array_copy_ctr=0;
80 int SharedRuntime::_slow_array_copy_ctr=0;
81 int SharedRuntime::_find_handler_ctr=0;
82 int SharedRuntime::_rethrow_ctr=0;
83
84 int SharedRuntime::_ICmiss_index = 0;
85 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
86 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
87
88 void SharedRuntime::trace_ic_miss(address at) {
89 for (int i = 0; i < _ICmiss_index; i++) {
90 if (_ICmiss_at[i] == at) {
91 _ICmiss_count[i]++;
92 return;
93 }
94 }
95 int index = _ICmiss_index++;
96 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
97 _ICmiss_at[index] = at;
98 _ICmiss_count[index] = 1;
99 }
100
101 void SharedRuntime::print_ic_miss_histogram() {
102 if (ICMissHistogram) {
103 tty->print_cr ("IC Miss Histogram:");
104 int tot_misses = 0;
105 for (int i = 0; i < _ICmiss_index; i++) {
106 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]);
107 tot_misses += _ICmiss_count[i];
108 }
109 tty->print_cr ("Total IC misses: %7d", tot_misses);
110 }
111 }
112 #endif // PRODUCT
113
114 #ifndef SERIALGC
115
116 // G1 write-barrier pre: executed before a pointer store.
117 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
118 if (orig == NULL) {
119 assert(false, "should be optimized out");
120 return;
121 }
122 assert(orig->is_oop(true /* ignore mark word */), "Error");
123 // store the original value that was in the field reference
124 thread->satb_mark_queue().enqueue(orig);
125 JRT_END
126
127 // G1 write-barrier post: executed after a pointer store.
128 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
129 thread->dirty_card_queue().enqueue(card_addr);
130 JRT_END
131
132 #endif // !SERIALGC
133
134
135 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
136 return x * y;
137 JRT_END
138
139
140 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
141 if (x == min_jlong && y == CONST64(-1)) {
142 return x;
143 } else {
144 return x / y;
145 }
146 JRT_END
147
148
149 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
150 if (x == min_jlong && y == CONST64(-1)) {
151 return 0;
152 } else {
153 return x % y;
154 }
155 JRT_END
156
157
158 const juint float_sign_mask = 0x7FFFFFFF;
159 const juint float_infinity = 0x7F800000;
160 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
161 const julong double_infinity = CONST64(0x7FF0000000000000);
162
163 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
164 #ifdef _WIN64
165 // 64-bit Windows on amd64 returns the wrong values for
166 // infinity operands.
167 union { jfloat f; juint i; } xbits, ybits;
168 xbits.f = x;
169 ybits.f = y;
170 // x Mod Infinity == x unless x is infinity
171 if ( ((xbits.i & float_sign_mask) != float_infinity) &&
172 ((ybits.i & float_sign_mask) == float_infinity) ) {
173 return x;
174 }
175 #endif
176 return ((jfloat)fmod((double)x,(double)y));
177 JRT_END
178
179
180 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
181 #ifdef _WIN64
182 union { jdouble d; julong l; } xbits, ybits;
183 xbits.d = x;
184 ybits.d = y;
185 // x Mod Infinity == x unless x is infinity
186 if ( ((xbits.l & double_sign_mask) != double_infinity) &&
187 ((ybits.l & double_sign_mask) == double_infinity) ) {
188 return x;
189 }
190 #endif
191 return ((jdouble)fmod((double)x,(double)y));
192 JRT_END
193
194
195 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
196 if (g_isnan(x))
197 return 0;
198 if (x >= (jfloat) max_jint)
199 return max_jint;
200 if (x <= (jfloat) min_jint)
201 return min_jint;
202 return (jint) x;
203 JRT_END
204
205
206 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
207 if (g_isnan(x))
208 return 0;
209 if (x >= (jfloat) max_jlong)
210 return max_jlong;
211 if (x <= (jfloat) min_jlong)
212 return min_jlong;
213 return (jlong) x;
214 JRT_END
215
216
217 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
218 if (g_isnan(x))
219 return 0;
220 if (x >= (jdouble) max_jint)
221 return max_jint;
222 if (x <= (jdouble) min_jint)
223 return min_jint;
224 return (jint) x;
225 JRT_END
226
227
228 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
229 if (g_isnan(x))
230 return 0;
231 if (x >= (jdouble) max_jlong)
232 return max_jlong;
233 if (x <= (jdouble) min_jlong)
234 return min_jlong;
235 return (jlong) x;
236 JRT_END
237
238
239 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
240 return (jfloat)x;
241 JRT_END
242
243
244 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
245 return (jfloat)x;
246 JRT_END
247
248
249 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
250 return (jdouble)x;
251 JRT_END
252
253 // Exception handling accross interpreter/compiler boundaries
254 //
255 // exception_handler_for_return_address(...) returns the continuation address.
256 // The continuation address is the entry point of the exception handler of the
257 // previous frame depending on the return address.
258
259 address SharedRuntime::raw_exception_handler_for_return_address(address return_address) {
260 assert(frame::verify_return_pc(return_address), "must be a return pc");
261
262 // the fastest case first
263 CodeBlob* blob = CodeCache::find_blob(return_address);
264 if (blob != NULL && blob->is_nmethod()) {
265 nmethod* code = (nmethod*)blob;
266 assert(code != NULL, "nmethod must be present");
267 // native nmethods don't have exception handlers
268 assert(!code->is_native_method(), "no exception handler");
269 assert(code->header_begin() != code->exception_begin(), "no exception handler");
270 if (code->is_deopt_pc(return_address)) {
271 return SharedRuntime::deopt_blob()->unpack_with_exception();
272 } else {
273 return code->exception_begin();
274 }
275 }
276
277 // Entry code
278 if (StubRoutines::returns_to_call_stub(return_address)) {
279 return StubRoutines::catch_exception_entry();
280 }
281 // Interpreted code
282 if (Interpreter::contains(return_address)) {
283 return Interpreter::rethrow_exception_entry();
284 }
285
286 // Compiled code
287 if (CodeCache::contains(return_address)) {
288 CodeBlob* blob = CodeCache::find_blob(return_address);
289 if (blob->is_nmethod()) {
290 nmethod* code = (nmethod*)blob;
291 assert(code != NULL, "nmethod must be present");
292 assert(code->header_begin() != code->exception_begin(), "no exception handler");
293 return code->exception_begin();
294 }
295 if (blob->is_runtime_stub()) {
296 ShouldNotReachHere(); // callers are responsible for skipping runtime stub frames
297 }
298 }
299 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
300 #ifndef PRODUCT
301 { ResourceMark rm;
302 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address);
303 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
304 tty->print_cr("b) other problem");
305 }
306 #endif // PRODUCT
307 ShouldNotReachHere();
308 return NULL;
309 }
310
311
312 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(address return_address))
313 return raw_exception_handler_for_return_address(return_address);
314 JRT_END
315
316 address SharedRuntime::get_poll_stub(address pc) {
317 address stub;
318 // Look up the code blob
319 CodeBlob *cb = CodeCache::find_blob(pc);
320
321 // Should be an nmethod
322 assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" );
323
324 // Look up the relocation information
325 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc),
326 "safepoint polling: type must be poll" );
327
328 assert( ((NativeInstruction*)pc)->is_safepoint_poll(),
329 "Only polling locations are used for safepoint");
330
331 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);
332 if (at_poll_return) {
333 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
334 "polling page return stub not created yet");
335 stub = SharedRuntime::polling_page_return_handler_blob()->instructions_begin();
336 } else {
337 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
338 "polling page safepoint stub not created yet");
339 stub = SharedRuntime::polling_page_safepoint_handler_blob()->instructions_begin();
340 }
341 #ifndef PRODUCT
342 if( TraceSafepoint ) {
343 char buf[256];
344 jio_snprintf(buf, sizeof(buf),
345 "... found polling page %s exception at pc = "
346 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
347 at_poll_return ? "return" : "loop",
348 (intptr_t)pc, (intptr_t)stub);
349 tty->print_raw_cr(buf);
350 }
351 #endif // PRODUCT
352 return stub;
353 }
354
355
356 oop SharedRuntime::retrieve_receiver( symbolHandle sig, frame caller ) {
357 assert(caller.is_interpreted_frame(), "");
358 int args_size = ArgumentSizeComputer(sig).size() + 1;
359 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
360 oop result = (oop) *caller.interpreter_frame_tos_at(args_size - 1);
361 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
362 return result;
363 }
364
365
366 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
367 if (JvmtiExport::can_post_exceptions()) {
368 vframeStream vfst(thread, true);
369 methodHandle method = methodHandle(thread, vfst.method());
370 address bcp = method()->bcp_from(vfst.bci());
371 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
372 }
373 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
374 }
375
376 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message) {
377 Handle h_exception = Exceptions::new_exception(thread, name, message);
378 throw_and_post_jvmti_exception(thread, h_exception);
379 }
380
381 // The interpreter code to call this tracing function is only
382 // called/generated when TraceRedefineClasses has the right bits
383 // set. Since obsolete methods are never compiled, we don't have
384 // to modify the compilers to generate calls to this function.
385 //
386 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
387 JavaThread* thread, methodOopDesc* method))
388 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
389
390 if (method->is_obsolete()) {
391 // We are calling an obsolete method, but this is not necessarily
392 // an error. Our method could have been redefined just after we
393 // fetched the methodOop from the constant pool.
394
395 // RC_TRACE macro has an embedded ResourceMark
396 RC_TRACE_WITH_THREAD(0x00001000, thread,
397 ("calling obsolete method '%s'",
398 method->name_and_sig_as_C_string()));
399 if (RC_TRACE_ENABLED(0x00002000)) {
400 // this option is provided to debug calls to obsolete methods
401 guarantee(false, "faulting at call to an obsolete method.");
402 }
403 }
404 return 0;
405 JRT_END
406
407 // ret_pc points into caller; we are returning caller's exception handler
408 // for given exception
409 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
410 bool force_unwind, bool top_frame_only) {
411 assert(nm != NULL, "must exist");
412 ResourceMark rm;
413
414 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
415 // determine handler bci, if any
416 EXCEPTION_MARK;
417
418 int handler_bci = -1;
419 int scope_depth = 0;
420 if (!force_unwind) {
421 int bci = sd->bci();
422 do {
423 bool skip_scope_increment = false;
424 // exception handler lookup
425 KlassHandle ek (THREAD, exception->klass());
426 handler_bci = sd->method()->fast_exception_handler_bci_for(ek, bci, THREAD);
427 if (HAS_PENDING_EXCEPTION) {
428 // We threw an exception while trying to find the exception handler.
429 // Transfer the new exception to the exception handle which will
430 // be set into thread local storage, and do another lookup for an
431 // exception handler for this exception, this time starting at the
432 // BCI of the exception handler which caused the exception to be
433 // thrown (bugs 4307310 and 4546590). Set "exception" reference
434 // argument to ensure that the correct exception is thrown (4870175).
435 exception = Handle(THREAD, PENDING_EXCEPTION);
436 CLEAR_PENDING_EXCEPTION;
437 if (handler_bci >= 0) {
438 bci = handler_bci;
439 handler_bci = -1;
440 skip_scope_increment = true;
441 }
442 }
443 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
444 sd = sd->sender();
445 if (sd != NULL) {
446 bci = sd->bci();
447 }
448 ++scope_depth;
449 }
450 } while (!top_frame_only && handler_bci < 0 && sd != NULL);
451 }
452
453 // found handling method => lookup exception handler
454 int catch_pco = ret_pc - nm->instructions_begin();
455
456 ExceptionHandlerTable table(nm);
457 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
458 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
459 // Allow abbreviated catch tables. The idea is to allow a method
460 // to materialize its exceptions without committing to the exact
461 // routing of exceptions. In particular this is needed for adding
462 // a synthethic handler to unlock monitors when inlining
463 // synchonized methods since the unlock path isn't represented in
464 // the bytecodes.
465 t = table.entry_for(catch_pco, -1, 0);
466 }
467
468 #ifdef COMPILER1
469 if (nm->is_compiled_by_c1() && t == NULL && handler_bci == -1) {
470 // Exception is not handled by this frame so unwind. Note that
471 // this is not the same as how C2 does this. C2 emits a table
472 // entry that dispatches to the unwind code in the nmethod.
473 return NULL;
474 }
475 #endif /* COMPILER1 */
476
477
478 if (t == NULL) {
479 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci);
480 tty->print_cr(" Exception:");
481 exception->print();
482 tty->cr();
483 tty->print_cr(" Compiled exception table :");
484 table.print();
485 nm->print_code();
486 guarantee(false, "missing exception handler");
487 return NULL;
488 }
489
490 return nm->instructions_begin() + t->pco();
491 }
492
493 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
494 // These errors occur only at call sites
495 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
496 JRT_END
497
498 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
499 // These errors occur only at call sites
500 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
501 JRT_END
502
503 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
504 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
505 JRT_END
506
507 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
508 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
509 JRT_END
510
511 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
512 // This entry point is effectively only used for NullPointerExceptions which occur at inline
513 // cache sites (when the callee activation is not yet set up) so we are at a call site
514 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
515 JRT_END
516
517 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
518 // We avoid using the normal exception construction in this case because
519 // it performs an upcall to Java, and we're already out of stack space.
520 klassOop k = SystemDictionary::StackOverflowError_klass();
521 oop exception_oop = instanceKlass::cast(k)->allocate_instance(CHECK);
522 Handle exception (thread, exception_oop);
523 if (StackTraceInThrowable) {
524 java_lang_Throwable::fill_in_stack_trace(exception);
525 }
526 throw_and_post_jvmti_exception(thread, exception);
527 JRT_END
528
529 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
530 address pc,
531 SharedRuntime::ImplicitExceptionKind exception_kind)
532 {
533 address target_pc = NULL;
534
535 if (Interpreter::contains(pc)) {
536 #ifdef CC_INTERP
537 // C++ interpreter doesn't throw implicit exceptions
538 ShouldNotReachHere();
539 #else
540 switch (exception_kind) {
541 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
542 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
543 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
544 default: ShouldNotReachHere();
545 }
546 #endif // !CC_INTERP
547 } else {
548 switch (exception_kind) {
549 case STACK_OVERFLOW: {
550 // Stack overflow only occurs upon frame setup; the callee is
551 // going to be unwound. Dispatch to a shared runtime stub
552 // which will cause the StackOverflowError to be fabricated
553 // and processed.
554 // For stack overflow in deoptimization blob, cleanup thread.
555 if (thread->deopt_mark() != NULL) {
556 Deoptimization::cleanup_deopt_info(thread, NULL);
557 }
558 return StubRoutines::throw_StackOverflowError_entry();
559 }
560
561 case IMPLICIT_NULL: {
562 if (VtableStubs::contains(pc)) {
563 // We haven't yet entered the callee frame. Fabricate an
564 // exception and begin dispatching it in the caller. Since
565 // the caller was at a call site, it's safe to destroy all
566 // caller-saved registers, as these entry points do.
567 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
568
569 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
570 if (vt_stub == NULL) return NULL;
571
572 if (vt_stub->is_abstract_method_error(pc)) {
573 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
574 return StubRoutines::throw_AbstractMethodError_entry();
575 } else {
576 return StubRoutines::throw_NullPointerException_at_call_entry();
577 }
578 } else {
579 CodeBlob* cb = CodeCache::find_blob(pc);
580
581 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
582 if (cb == NULL) return NULL;
583
584 // Exception happened in CodeCache. Must be either:
585 // 1. Inline-cache check in C2I handler blob,
586 // 2. Inline-cache check in nmethod, or
587 // 3. Implict null exception in nmethod
588
589 if (!cb->is_nmethod()) {
590 guarantee(cb->is_adapter_blob(),
591 "exception happened outside interpreter, nmethods and vtable stubs (1)");
592 // There is no handler here, so we will simply unwind.
593 return StubRoutines::throw_NullPointerException_at_call_entry();
594 }
595
596 // Otherwise, it's an nmethod. Consult its exception handlers.
597 nmethod* nm = (nmethod*)cb;
598 if (nm->inlinecache_check_contains(pc)) {
599 // exception happened inside inline-cache check code
600 // => the nmethod is not yet active (i.e., the frame
601 // is not set up yet) => use return address pushed by
602 // caller => don't push another return address
603 return StubRoutines::throw_NullPointerException_at_call_entry();
604 }
605
606 #ifndef PRODUCT
607 _implicit_null_throws++;
608 #endif
609 target_pc = nm->continuation_for_implicit_exception(pc);
610 guarantee(target_pc != 0, "must have a continuation point");
611 }
612
613 break; // fall through
614 }
615
616
617 case IMPLICIT_DIVIDE_BY_ZERO: {
618 nmethod* nm = CodeCache::find_nmethod(pc);
619 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");
620 #ifndef PRODUCT
621 _implicit_div0_throws++;
622 #endif
623 target_pc = nm->continuation_for_implicit_exception(pc);
624 guarantee(target_pc != 0, "must have a continuation point");
625 break; // fall through
626 }
627
628 default: ShouldNotReachHere();
629 }
630
631 guarantee(target_pc != NULL, "must have computed destination PC for implicit exception");
632 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
633
634 // for AbortVMOnException flag
635 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));
636 if (exception_kind == IMPLICIT_NULL) {
637 Events::log("Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
638 } else {
639 Events::log("Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
640 }
641 return target_pc;
642 }
643
644 ShouldNotReachHere();
645 return NULL;
646 }
647
648
649 JNI_ENTRY(void, throw_unsatisfied_link_error(JNIEnv* env, ...))
650 {
651 THROW(vmSymbols::java_lang_UnsatisfiedLinkError());
652 }
653 JNI_END
654
655
656 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
657 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
658 }
659
660
661 #ifndef PRODUCT
662 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
663 const frame f = thread->last_frame();
664 assert(f.is_interpreted_frame(), "must be an interpreted frame");
665 #ifndef PRODUCT
666 methodHandle mh(THREAD, f.interpreter_frame_method());
667 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
668 #endif // !PRODUCT
669 return preserve_this_value;
670 JRT_END
671 #endif // !PRODUCT
672
673
674 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts))
675 os::yield_all(attempts);
676 JRT_END
677
678
679 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
680 assert(obj->is_oop(), "must be a valid oop");
681 assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise");
682 instanceKlass::register_finalizer(instanceOop(obj), CHECK);
683 JRT_END
684
685
686 jlong SharedRuntime::get_java_tid(Thread* thread) {
687 if (thread != NULL) {
688 if (thread->is_Java_thread()) {
689 oop obj = ((JavaThread*)thread)->threadObj();
690 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
691 }
692 }
693 return 0;
694 }
695
696 /**
697 * This function ought to be a void function, but cannot be because
698 * it gets turned into a tail-call on sparc, which runs into dtrace bug
699 * 6254741. Once that is fixed we can remove the dummy return value.
700 */
701 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
702 return dtrace_object_alloc_base(Thread::current(), o);
703 }
704
705 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) {
706 assert(DTraceAllocProbes, "wrong call");
707 Klass* klass = o->blueprint();
708 int size = o->size();
709 symbolOop name = klass->name();
710 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread),
711 name->bytes(), name->utf8_length(), size * HeapWordSize);
712 return 0;
713 }
714
715 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
716 JavaThread* thread, methodOopDesc* method))
717 assert(DTraceMethodProbes, "wrong call");
718 symbolOop kname = method->klass_name();
719 symbolOop name = method->name();
720 symbolOop sig = method->signature();
721 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread),
722 kname->bytes(), kname->utf8_length(),
723 name->bytes(), name->utf8_length(),
724 sig->bytes(), sig->utf8_length());
725 return 0;
726 JRT_END
727
728 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
729 JavaThread* thread, methodOopDesc* method))
730 assert(DTraceMethodProbes, "wrong call");
731 symbolOop kname = method->klass_name();
732 symbolOop name = method->name();
733 symbolOop sig = method->signature();
734 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread),
735 kname->bytes(), kname->utf8_length(),
736 name->bytes(), name->utf8_length(),
737 sig->bytes(), sig->utf8_length());
738 return 0;
739 JRT_END
740
741
742 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
743 // for a call current in progress, i.e., arguments has been pushed on stack
744 // put callee has not been invoked yet. Used by: resolve virtual/static,
745 // vtable updates, etc. Caller frame must be compiled.
746 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
747 ResourceMark rm(THREAD);
748
749 // last java frame on stack (which includes native call frames)
750 vframeStream vfst(thread, true); // Do not skip and javaCalls
751
752 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));
753 }
754
755
756 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
757 // for a call current in progress, i.e., arguments has been pushed on stack
758 // but callee has not been invoked yet. Caller frame must be compiled.
759 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
760 vframeStream& vfst,
761 Bytecodes::Code& bc,
762 CallInfo& callinfo, TRAPS) {
763 Handle receiver;
764 Handle nullHandle; //create a handy null handle for exception returns
765
766 assert(!vfst.at_end(), "Java frame must exist");
767
768 // Find caller and bci from vframe
769 methodHandle caller (THREAD, vfst.method());
770 int bci = vfst.bci();
771
772 // Find bytecode
773 Bytecode_invoke* bytecode = Bytecode_invoke_at(caller, bci);
774 bc = bytecode->adjusted_invoke_code();
775 int bytecode_index = bytecode->index();
776
777 // Find receiver for non-static call
778 if (bc != Bytecodes::_invokestatic) {
779 // This register map must be update since we need to find the receiver for
780 // compiled frames. The receiver might be in a register.
781 RegisterMap reg_map2(thread);
782 frame stubFrame = thread->last_frame();
783 // Caller-frame is a compiled frame
784 frame callerFrame = stubFrame.sender(®_map2);
785
786 methodHandle callee = bytecode->static_target(CHECK_(nullHandle));
787 if (callee.is_null()) {
788 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
789 }
790 // Retrieve from a compiled argument list
791 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
792
793 if (receiver.is_null()) {
794 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
795 }
796 }
797
798 // Resolve method. This is parameterized by bytecode.
799 constantPoolHandle constants (THREAD, caller->constants());
800 assert (receiver.is_null() || receiver->is_oop(), "wrong receiver");
801 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));
802
803 #ifdef ASSERT
804 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
805 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic) {
806 assert(receiver.not_null(), "should have thrown exception");
807 KlassHandle receiver_klass (THREAD, receiver->klass());
808 klassOop rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));
809 // klass is already loaded
810 KlassHandle static_receiver_klass (THREAD, rk);
811 assert(receiver_klass->is_subtype_of(static_receiver_klass()), "actual receiver must be subclass of static receiver klass");
812 if (receiver_klass->oop_is_instance()) {
813 if (instanceKlass::cast(receiver_klass())->is_not_initialized()) {
814 tty->print_cr("ERROR: Klass not yet initialized!!");
815 receiver_klass.print();
816 }
817 assert (!instanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
818 }
819 }
820 #endif
821
822 return receiver;
823 }
824
825 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
826 ResourceMark rm(THREAD);
827 // We need first to check if any Java activations (compiled, interpreted)
828 // exist on the stack since last JavaCall. If not, we need
829 // to get the target method from the JavaCall wrapper.
830 vframeStream vfst(thread, true); // Do not skip any javaCalls
831 methodHandle callee_method;
832 if (vfst.at_end()) {
833 // No Java frames were found on stack since we did the JavaCall.
834 // Hence the stack can only contain an entry_frame. We need to
835 // find the target method from the stub frame.
836 RegisterMap reg_map(thread, false);
837 frame fr = thread->last_frame();
838 assert(fr.is_runtime_frame(), "must be a runtimeStub");
839 fr = fr.sender(®_map);
840 assert(fr.is_entry_frame(), "must be");
841 // fr is now pointing to the entry frame.
842 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
843 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
844 } else {
845 Bytecodes::Code bc;
846 CallInfo callinfo;
847 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
848 callee_method = callinfo.selected_method();
849 }
850 assert(callee_method()->is_method(), "must be");
851 return callee_method;
852 }
853
854 // Resolves a call.
855 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
856 bool is_virtual,
857 bool is_optimized, TRAPS) {
858 methodHandle callee_method;
859 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
860 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
861 int retry_count = 0;
862 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
863 callee_method->method_holder() != SystemDictionary::object_klass()) {
864 // If has a pending exception then there is no need to re-try to
865 // resolve this method.
866 // If the method has been redefined, we need to try again.
867 // Hack: we have no way to update the vtables of arrays, so don't
868 // require that java.lang.Object has been updated.
869
870 // It is very unlikely that method is redefined more than 100 times
871 // in the middle of resolve. If it is looping here more than 100 times
872 // means then there could be a bug here.
873 guarantee((retry_count++ < 100),
874 "Could not resolve to latest version of redefined method");
875 // method is redefined in the middle of resolve so re-try.
876 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
877 }
878 }
879 return callee_method;
880 }
881
882 // Resolves a call. The compilers generate code for calls that go here
883 // and are patched with the real destination of the call.
884 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
885 bool is_virtual,
886 bool is_optimized, TRAPS) {
887
888 ResourceMark rm(thread);
889 RegisterMap cbl_map(thread, false);
890 frame caller_frame = thread->last_frame().sender(&cbl_map);
891
892 CodeBlob* cb = caller_frame.cb();
893 guarantee(cb != NULL && cb->is_nmethod(), "must be called from nmethod");
894 // make sure caller is not getting deoptimized
895 // and removed before we are done with it.
896 // CLEANUP - with lazy deopt shouldn't need this lock
897 nmethodLocker caller_lock((nmethod*)cb);
898
899
900 // determine call info & receiver
901 // note: a) receiver is NULL for static calls
902 // b) an exception is thrown if receiver is NULL for non-static calls
903 CallInfo call_info;
904 Bytecodes::Code invoke_code = Bytecodes::_illegal;
905 Handle receiver = find_callee_info(thread, invoke_code,
906 call_info, CHECK_(methodHandle()));
907 methodHandle callee_method = call_info.selected_method();
908
909 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic) ||
910 ( is_virtual && invoke_code != Bytecodes::_invokestatic), "inconsistent bytecode");
911
912 #ifndef PRODUCT
913 // tracing/debugging/statistics
914 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
915 (is_virtual) ? (&_resolve_virtual_ctr) :
916 (&_resolve_static_ctr);
917 Atomic::inc(addr);
918
919 if (TraceCallFixup) {
920 ResourceMark rm(thread);
921 tty->print("resolving %s%s (%s) call to",
922 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
923 Bytecodes::name(invoke_code));
924 callee_method->print_short_name(tty);
925 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
926 }
927 #endif
928
929 // Compute entry points. This might require generation of C2I converter
930 // frames, so we cannot be holding any locks here. Furthermore, the
931 // computation of the entry points is independent of patching the call. We
932 // always return the entry-point, but we only patch the stub if the call has
933 // not been deoptimized. Return values: For a virtual call this is an
934 // (cached_oop, destination address) pair. For a static call/optimized
935 // virtual this is just a destination address.
936
937 StaticCallInfo static_call_info;
938 CompiledICInfo virtual_call_info;
939
940
941 // Make sure the callee nmethod does not get deoptimized and removed before
942 // we are done patching the code.
943 nmethod* nm = callee_method->code();
944 nmethodLocker nl_callee(nm);
945 #ifdef ASSERT
946 address dest_entry_point = nm == NULL ? 0 : nm->entry_point(); // used below
947 #endif
948
949 if (is_virtual) {
950 assert(receiver.not_null(), "sanity check");
951 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
952 KlassHandle h_klass(THREAD, receiver->klass());
953 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
954 is_optimized, static_bound, virtual_call_info,
955 CHECK_(methodHandle()));
956 } else {
957 // static call
958 CompiledStaticCall::compute_entry(callee_method, static_call_info);
959 }
960
961 // grab lock, check for deoptimization and potentially patch caller
962 {
963 MutexLocker ml_patch(CompiledIC_lock);
964
965 // Now that we are ready to patch if the methodOop was redefined then
966 // don't update call site and let the caller retry.
967
968 if (!callee_method->is_old()) {
969 #ifdef ASSERT
970 // We must not try to patch to jump to an already unloaded method.
971 if (dest_entry_point != 0) {
972 assert(CodeCache::find_blob(dest_entry_point) != NULL,
973 "should not unload nmethod while locked");
974 }
975 #endif
976 if (is_virtual) {
977 CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc());
978 if (inline_cache->is_clean()) {
979 inline_cache->set_to_monomorphic(virtual_call_info);
980 }
981 } else {
982 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
983 if (ssc->is_clean()) ssc->set(static_call_info);
984 }
985 }
986
987 } // unlock CompiledIC_lock
988
989 return callee_method;
990 }
991
992
993 // Inline caches exist only in compiled code
994 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
995 #ifdef ASSERT
996 RegisterMap reg_map(thread, false);
997 frame stub_frame = thread->last_frame();
998 assert(stub_frame.is_runtime_frame(), "sanity check");
999 frame caller_frame = stub_frame.sender(®_map);
1000 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1001 #endif /* ASSERT */
1002
1003 methodHandle callee_method;
1004 JRT_BLOCK
1005 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1006 // Return methodOop through TLS
1007 thread->set_vm_result(callee_method());
1008 JRT_BLOCK_END
1009 // return compiled code entry point after potential safepoints
1010 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1011 return callee_method->verified_code_entry();
1012 JRT_END
1013
1014
1015 // Handle call site that has been made non-entrant
1016 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1017 // 6243940 We might end up in here if the callee is deoptimized
1018 // as we race to call it. We don't want to take a safepoint if
1019 // the caller was interpreted because the caller frame will look
1020 // interpreted to the stack walkers and arguments are now
1021 // "compiled" so it is much better to make this transition
1022 // invisible to the stack walking code. The i2c path will
1023 // place the callee method in the callee_target. It is stashed
1024 // there because if we try and find the callee by normal means a
1025 // safepoint is possible and have trouble gc'ing the compiled args.
1026 RegisterMap reg_map(thread, false);
1027 frame stub_frame = thread->last_frame();
1028 assert(stub_frame.is_runtime_frame(), "sanity check");
1029 frame caller_frame = stub_frame.sender(®_map);
1030
1031 // MethodHandle invokes don't have a CompiledIC and should always
1032 // simply redispatch to the callee_target.
1033 address sender_pc = caller_frame.pc();
1034 CodeBlob* sender_cb = caller_frame.cb();
1035 nmethod* sender_nm = sender_cb->as_nmethod_or_null();
1036
1037 if (caller_frame.is_interpreted_frame() ||
1038 caller_frame.is_entry_frame() ||
1039 (sender_nm != NULL && sender_nm->is_method_handle_return(sender_pc))) {
1040 methodOop callee = thread->callee_target();
1041 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1042 thread->set_vm_result(callee);
1043 thread->set_callee_target(NULL);
1044 return callee->get_c2i_entry();
1045 }
1046
1047 // Must be compiled to compiled path which is safe to stackwalk
1048 methodHandle callee_method;
1049 JRT_BLOCK
1050 // Force resolving of caller (if we called from compiled frame)
1051 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1052 thread->set_vm_result(callee_method());
1053 JRT_BLOCK_END
1054 // return compiled code entry point after potential safepoints
1055 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1056 return callee_method->verified_code_entry();
1057 JRT_END
1058
1059
1060 // resolve a static call and patch code
1061 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1062 methodHandle callee_method;
1063 JRT_BLOCK
1064 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1065 thread->set_vm_result(callee_method());
1066 JRT_BLOCK_END
1067 // return compiled code entry point after potential safepoints
1068 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1069 return callee_method->verified_code_entry();
1070 JRT_END
1071
1072
1073 // resolve virtual call and update inline cache to monomorphic
1074 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1075 methodHandle callee_method;
1076 JRT_BLOCK
1077 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1078 thread->set_vm_result(callee_method());
1079 JRT_BLOCK_END
1080 // return compiled code entry point after potential safepoints
1081 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1082 return callee_method->verified_code_entry();
1083 JRT_END
1084
1085
1086 // Resolve a virtual call that can be statically bound (e.g., always
1087 // monomorphic, so it has no inline cache). Patch code to resolved target.
1088 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1089 methodHandle callee_method;
1090 JRT_BLOCK
1091 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1092 thread->set_vm_result(callee_method());
1093 JRT_BLOCK_END
1094 // return compiled code entry point after potential safepoints
1095 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1096 return callee_method->verified_code_entry();
1097 JRT_END
1098
1099
1100
1101
1102
1103 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1104 ResourceMark rm(thread);
1105 CallInfo call_info;
1106 Bytecodes::Code bc;
1107
1108 // receiver is NULL for static calls. An exception is thrown for NULL
1109 // receivers for non-static calls
1110 Handle receiver = find_callee_info(thread, bc, call_info,
1111 CHECK_(methodHandle()));
1112 // Compiler1 can produce virtual call sites that can actually be statically bound
1113 // If we fell thru to below we would think that the site was going megamorphic
1114 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1115 // we'd try and do a vtable dispatch however methods that can be statically bound
1116 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1117 // reresolution of the call site (as if we did a handle_wrong_method and not an
1118 // plain ic_miss) and the site will be converted to an optimized virtual call site
1119 // never to miss again. I don't believe C2 will produce code like this but if it
1120 // did this would still be the correct thing to do for it too, hence no ifdef.
1121 //
1122 if (call_info.resolved_method()->can_be_statically_bound()) {
1123 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1124 if (TraceCallFixup) {
1125 RegisterMap reg_map(thread, false);
1126 frame caller_frame = thread->last_frame().sender(®_map);
1127 ResourceMark rm(thread);
1128 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1129 callee_method->print_short_name(tty);
1130 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());
1131 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1132 }
1133 return callee_method;
1134 }
1135
1136 methodHandle callee_method = call_info.selected_method();
1137
1138 bool should_be_mono = false;
1139
1140 #ifndef PRODUCT
1141 Atomic::inc(&_ic_miss_ctr);
1142
1143 // Statistics & Tracing
1144 if (TraceCallFixup) {
1145 ResourceMark rm(thread);
1146 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1147 callee_method->print_short_name(tty);
1148 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1149 }
1150
1151 if (ICMissHistogram) {
1152 MutexLocker m(VMStatistic_lock);
1153 RegisterMap reg_map(thread, false);
1154 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1155 // produce statistics under the lock
1156 trace_ic_miss(f.pc());
1157 }
1158 #endif
1159
1160 // install an event collector so that when a vtable stub is created the
1161 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1162 // event can't be posted when the stub is created as locks are held
1163 // - instead the event will be deferred until the event collector goes
1164 // out of scope.
1165 JvmtiDynamicCodeEventCollector event_collector;
1166
1167 // Update inline cache to megamorphic. Skip update if caller has been
1168 // made non-entrant or we are called from interpreted.
1169 { MutexLocker ml_patch (CompiledIC_lock);
1170 RegisterMap reg_map(thread, false);
1171 frame caller_frame = thread->last_frame().sender(®_map);
1172 CodeBlob* cb = caller_frame.cb();
1173 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) {
1174 // Not a non-entrant nmethod, so find inline_cache
1175 CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc());
1176 bool should_be_mono = false;
1177 if (inline_cache->is_optimized()) {
1178 if (TraceCallFixup) {
1179 ResourceMark rm(thread);
1180 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1181 callee_method->print_short_name(tty);
1182 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1183 }
1184 should_be_mono = true;
1185 } else {
1186 compiledICHolderOop ic_oop = (compiledICHolderOop) inline_cache->cached_oop();
1187 if ( ic_oop != NULL && ic_oop->is_compiledICHolder()) {
1188
1189 if (receiver()->klass() == ic_oop->holder_klass()) {
1190 // This isn't a real miss. We must have seen that compiled code
1191 // is now available and we want the call site converted to a
1192 // monomorphic compiled call site.
1193 // We can't assert for callee_method->code() != NULL because it
1194 // could have been deoptimized in the meantime
1195 if (TraceCallFixup) {
1196 ResourceMark rm(thread);
1197 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1198 callee_method->print_short_name(tty);
1199 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1200 }
1201 should_be_mono = true;
1202 }
1203 }
1204 }
1205
1206 if (should_be_mono) {
1207
1208 // We have a path that was monomorphic but was going interpreted
1209 // and now we have (or had) a compiled entry. We correct the IC
1210 // by using a new icBuffer.
1211 CompiledICInfo info;
1212 KlassHandle receiver_klass(THREAD, receiver()->klass());
1213 inline_cache->compute_monomorphic_entry(callee_method,
1214 receiver_klass,
1215 inline_cache->is_optimized(),
1216 false,
1217 info, CHECK_(methodHandle()));
1218 inline_cache->set_to_monomorphic(info);
1219 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1220 // Change to megamorphic
1221 inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1222 } else {
1223 // Either clean or megamorphic
1224 }
1225 }
1226 } // Release CompiledIC_lock
1227
1228 return callee_method;
1229 }
1230
1231 //
1232 // Resets a call-site in compiled code so it will get resolved again.
1233 // This routines handles both virtual call sites, optimized virtual call
1234 // sites, and static call sites. Typically used to change a call sites
1235 // destination from compiled to interpreted.
1236 //
1237 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1238 ResourceMark rm(thread);
1239 RegisterMap reg_map(thread, false);
1240 frame stub_frame = thread->last_frame();
1241 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1242 frame caller = stub_frame.sender(®_map);
1243
1244 // Do nothing if the frame isn't a live compiled frame.
1245 // nmethod could be deoptimized by the time we get here
1246 // so no update to the caller is needed.
1247
1248 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1249
1250 address pc = caller.pc();
1251 Events::log("update call-site at pc " INTPTR_FORMAT, pc);
1252
1253 // Default call_addr is the location of the "basic" call.
1254 // Determine the address of the call we a reresolving. With
1255 // Inline Caches we will always find a recognizable call.
1256 // With Inline Caches disabled we may or may not find a
1257 // recognizable call. We will always find a call for static
1258 // calls and for optimized virtual calls. For vanilla virtual
1259 // calls it depends on the state of the UseInlineCaches switch.
1260 //
1261 // With Inline Caches disabled we can get here for a virtual call
1262 // for two reasons:
1263 // 1 - calling an abstract method. The vtable for abstract methods
1264 // will run us thru handle_wrong_method and we will eventually
1265 // end up in the interpreter to throw the ame.
1266 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1267 // call and between the time we fetch the entry address and
1268 // we jump to it the target gets deoptimized. Similar to 1
1269 // we will wind up in the interprter (thru a c2i with c2).
1270 //
1271 address call_addr = NULL;
1272 {
1273 // Get call instruction under lock because another thread may be
1274 // busy patching it.
1275 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1276 // Location of call instruction
1277 if (NativeCall::is_call_before(pc)) {
1278 NativeCall *ncall = nativeCall_before(pc);
1279 call_addr = ncall->instruction_address();
1280 }
1281 }
1282
1283 // Check for static or virtual call
1284 bool is_static_call = false;
1285 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1286 // Make sure nmethod doesn't get deoptimized and removed until
1287 // this is done with it.
1288 // CLEANUP - with lazy deopt shouldn't need this lock
1289 nmethodLocker nmlock(caller_nm);
1290
1291 if (call_addr != NULL) {
1292 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1293 int ret = iter.next(); // Get item
1294 if (ret) {
1295 assert(iter.addr() == call_addr, "must find call");
1296 if (iter.type() == relocInfo::static_call_type) {
1297 is_static_call = true;
1298 } else {
1299 assert(iter.type() == relocInfo::virtual_call_type ||
1300 iter.type() == relocInfo::opt_virtual_call_type
1301 , "unexpected relocInfo. type");
1302 }
1303 } else {
1304 assert(!UseInlineCaches, "relocation info. must exist for this address");
1305 }
1306
1307 // Cleaning the inline cache will force a new resolve. This is more robust
1308 // than directly setting it to the new destination, since resolving of calls
1309 // is always done through the same code path. (experience shows that it
1310 // leads to very hard to track down bugs, if an inline cache gets updated
1311 // to a wrong method). It should not be performance critical, since the
1312 // resolve is only done once.
1313
1314 MutexLocker ml(CompiledIC_lock);
1315 //
1316 // We do not patch the call site if the nmethod has been made non-entrant
1317 // as it is a waste of time
1318 //
1319 if (caller_nm->is_in_use()) {
1320 if (is_static_call) {
1321 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1322 ssc->set_to_clean();
1323 } else {
1324 // compiled, dispatched call (which used to call an interpreted method)
1325 CompiledIC* inline_cache = CompiledIC_at(call_addr);
1326 inline_cache->set_to_clean();
1327 }
1328 }
1329 }
1330
1331 }
1332
1333 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1334
1335
1336 #ifndef PRODUCT
1337 Atomic::inc(&_wrong_method_ctr);
1338
1339 if (TraceCallFixup) {
1340 ResourceMark rm(thread);
1341 tty->print("handle_wrong_method reresolving call to");
1342 callee_method->print_short_name(tty);
1343 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1344 }
1345 #endif
1346
1347 return callee_method;
1348 }
1349
1350 // ---------------------------------------------------------------------------
1351 // We are calling the interpreter via a c2i. Normally this would mean that
1352 // we were called by a compiled method. However we could have lost a race
1353 // where we went int -> i2c -> c2i and so the caller could in fact be
1354 // interpreted. If the caller is compiled we attampt to patch the caller
1355 // so he no longer calls into the interpreter.
1356 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(methodOopDesc* method, address caller_pc))
1357 methodOop moop(method);
1358
1359 address entry_point = moop->from_compiled_entry();
1360
1361 // It's possible that deoptimization can occur at a call site which hasn't
1362 // been resolved yet, in which case this function will be called from
1363 // an nmethod that has been patched for deopt and we can ignore the
1364 // request for a fixup.
1365 // Also it is possible that we lost a race in that from_compiled_entry
1366 // is now back to the i2c in that case we don't need to patch and if
1367 // we did we'd leap into space because the callsite needs to use
1368 // "to interpreter" stub in order to load up the methodOop. Don't
1369 // ask me how I know this...
1370 //
1371
1372 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1373 if ( !cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1374 return;
1375 }
1376
1377 // There is a benign race here. We could be attempting to patch to a compiled
1378 // entry point at the same time the callee is being deoptimized. If that is
1379 // the case then entry_point may in fact point to a c2i and we'd patch the
1380 // call site with the same old data. clear_code will set code() to NULL
1381 // at the end of it. If we happen to see that NULL then we can skip trying
1382 // to patch. If we hit the window where the callee has a c2i in the
1383 // from_compiled_entry and the NULL isn't present yet then we lose the race
1384 // and patch the code with the same old data. Asi es la vida.
1385
1386 if (moop->code() == NULL) return;
1387
1388 if (((nmethod*)cb)->is_in_use()) {
1389
1390 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1391 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1392 if (NativeCall::is_call_before(caller_pc + frame::pc_return_offset)) {
1393 NativeCall *call = nativeCall_before(caller_pc + frame::pc_return_offset);
1394 //
1395 // bug 6281185. We might get here after resolving a call site to a vanilla
1396 // virtual call. Because the resolvee uses the verified entry it may then
1397 // see compiled code and attempt to patch the site by calling us. This would
1398 // then incorrectly convert the call site to optimized and its downhill from
1399 // there. If you're lucky you'll get the assert in the bugid, if not you've
1400 // just made a call site that could be megamorphic into a monomorphic site
1401 // for the rest of its life! Just another racing bug in the life of
1402 // fixup_callers_callsite ...
1403 //
1404 RelocIterator iter(cb, call->instruction_address(), call->next_instruction_address());
1405 iter.next();
1406 assert(iter.has_current(), "must have a reloc at java call site");
1407 relocInfo::relocType typ = iter.reloc()->type();
1408 if ( typ != relocInfo::static_call_type &&
1409 typ != relocInfo::opt_virtual_call_type &&
1410 typ != relocInfo::static_stub_type) {
1411 return;
1412 }
1413 address destination = call->destination();
1414 if (destination != entry_point) {
1415 CodeBlob* callee = CodeCache::find_blob(destination);
1416 // callee == cb seems weird. It means calling interpreter thru stub.
1417 if (callee == cb || callee->is_adapter_blob()) {
1418 // static call or optimized virtual
1419 if (TraceCallFixup) {
1420 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1421 moop->print_short_name(tty);
1422 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1423 }
1424 call->set_destination_mt_safe(entry_point);
1425 } else {
1426 if (TraceCallFixup) {
1427 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1428 moop->print_short_name(tty);
1429 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1430 }
1431 // assert is too strong could also be resolve destinations.
1432 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1433 }
1434 } else {
1435 if (TraceCallFixup) {
1436 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1437 moop->print_short_name(tty);
1438 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1439 }
1440 }
1441 }
1442 }
1443
1444 IRT_END
1445
1446
1447 // same as JVM_Arraycopy, but called directly from compiled code
1448 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1449 oopDesc* dest, jint dest_pos,
1450 jint length,
1451 JavaThread* thread)) {
1452 #ifndef PRODUCT
1453 _slow_array_copy_ctr++;
1454 #endif
1455 // Check if we have null pointers
1456 if (src == NULL || dest == NULL) {
1457 THROW(vmSymbols::java_lang_NullPointerException());
1458 }
1459 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1460 // even though the copy_array API also performs dynamic checks to ensure
1461 // that src and dest are truly arrays (and are conformable).
1462 // The copy_array mechanism is awkward and could be removed, but
1463 // the compilers don't call this function except as a last resort,
1464 // so it probably doesn't matter.
1465 Klass::cast(src->klass())->copy_array((arrayOopDesc*)src, src_pos,
1466 (arrayOopDesc*)dest, dest_pos,
1467 length, thread);
1468 }
1469 JRT_END
1470
1471 char* SharedRuntime::generate_class_cast_message(
1472 JavaThread* thread, const char* objName) {
1473
1474 // Get target class name from the checkcast instruction
1475 vframeStream vfst(thread, true);
1476 assert(!vfst.at_end(), "Java frame must exist");
1477 Bytecode_checkcast* cc = Bytecode_checkcast_at(
1478 vfst.method()->bcp_from(vfst.bci()));
1479 Klass* targetKlass = Klass::cast(vfst.method()->constants()->klass_at(
1480 cc->index(), thread));
1481 return generate_class_cast_message(objName, targetKlass->external_name());
1482 }
1483
1484 char* SharedRuntime::generate_wrong_method_type_message(JavaThread* thread,
1485 oopDesc* required,
1486 oopDesc* actual) {
1487 assert(EnableMethodHandles, "");
1488 oop singleKlass = wrong_method_type_is_for_single_argument(thread, required);
1489 if (singleKlass != NULL) {
1490 const char* objName = "argument or return value";
1491 if (actual != NULL) {
1492 // be flexible about the junk passed in:
1493 klassOop ak = (actual->is_klass()
1494 ? (klassOop)actual
1495 : actual->klass());
1496 objName = Klass::cast(ak)->external_name();
1497 }
1498 Klass* targetKlass = Klass::cast(required->is_klass()
1499 ? (klassOop)required
1500 : java_lang_Class::as_klassOop(required));
1501 return generate_class_cast_message(objName, targetKlass->external_name());
1502 } else {
1503 // %%% need to get the MethodType string, without messing around too much
1504 // Get a signature from the invoke instruction
1505 const char* mhName = "method handle";
1506 const char* targetType = "the required signature";
1507 vframeStream vfst(thread, true);
1508 if (!vfst.at_end()) {
1509 Bytecode_invoke* call = Bytecode_invoke_at(vfst.method(), vfst.bci());
1510 methodHandle target;
1511 {
1512 EXCEPTION_MARK;
1513 target = call->static_target(THREAD);
1514 if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; }
1515 }
1516 if (target.not_null()
1517 && target->is_method_handle_invoke()
1518 && required == target->method_handle_type()) {
1519 targetType = target->signature()->as_C_string();
1520 }
1521 }
1522 klassOop kignore; int fignore;
1523 methodOop actual_method = MethodHandles::decode_method(actual,
1524 kignore, fignore);
1525 if (actual_method != NULL) {
1526 if (actual_method->name() == vmSymbols::invoke_name())
1527 mhName = "$";
1528 else
1529 mhName = actual_method->signature()->as_C_string();
1530 if (mhName[0] == '$')
1531 mhName = actual_method->signature()->as_C_string();
1532 }
1533 return generate_class_cast_message(mhName, targetType,
1534 " cannot be called as ");
1535 }
1536 }
1537
1538 oop SharedRuntime::wrong_method_type_is_for_single_argument(JavaThread* thr,
1539 oopDesc* required) {
1540 if (required == NULL) return NULL;
1541 if (required->klass() == SystemDictionary::class_klass())
1542 return required;
1543 if (required->is_klass())
1544 return Klass::cast(klassOop(required))->java_mirror();
1545 return NULL;
1546 }
1547
1548
1549 char* SharedRuntime::generate_class_cast_message(
1550 const char* objName, const char* targetKlassName, const char* desc) {
1551 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1552
1553 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1554 if (NULL == message) {
1555 // Shouldn't happen, but don't cause even more problems if it does
1556 message = const_cast<char*>(objName);
1557 } else {
1558 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1559 }
1560 return message;
1561 }
1562
1563 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1564 (void) JavaThread::current()->reguard_stack();
1565 JRT_END
1566
1567
1568 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1569 #ifndef PRODUCT
1570 int SharedRuntime::_monitor_enter_ctr=0;
1571 #endif
1572 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1573 oop obj(_obj);
1574 #ifndef PRODUCT
1575 _monitor_enter_ctr++; // monitor enter slow
1576 #endif
1577 if (PrintBiasedLockingStatistics) {
1578 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1579 }
1580 Handle h_obj(THREAD, obj);
1581 if (UseBiasedLocking) {
1582 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1583 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1584 } else {
1585 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1586 }
1587 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1588 JRT_END
1589
1590 #ifndef PRODUCT
1591 int SharedRuntime::_monitor_exit_ctr=0;
1592 #endif
1593 // Handles the uncommon cases of monitor unlocking in compiled code
1594 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))
1595 oop obj(_obj);
1596 #ifndef PRODUCT
1597 _monitor_exit_ctr++; // monitor exit slow
1598 #endif
1599 Thread* THREAD = JavaThread::current();
1600 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1601 // testing was unable to ever fire the assert that guarded it so I have removed it.
1602 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1603 #undef MIGHT_HAVE_PENDING
1604 #ifdef MIGHT_HAVE_PENDING
1605 // Save and restore any pending_exception around the exception mark.
1606 // While the slow_exit must not throw an exception, we could come into
1607 // this routine with one set.
1608 oop pending_excep = NULL;
1609 const char* pending_file;
1610 int pending_line;
1611 if (HAS_PENDING_EXCEPTION) {
1612 pending_excep = PENDING_EXCEPTION;
1613 pending_file = THREAD->exception_file();
1614 pending_line = THREAD->exception_line();
1615 CLEAR_PENDING_EXCEPTION;
1616 }
1617 #endif /* MIGHT_HAVE_PENDING */
1618
1619 {
1620 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1621 EXCEPTION_MARK;
1622 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
1623 }
1624
1625 #ifdef MIGHT_HAVE_PENDING
1626 if (pending_excep != NULL) {
1627 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
1628 }
1629 #endif /* MIGHT_HAVE_PENDING */
1630 JRT_END
1631
1632 #ifndef PRODUCT
1633
1634 void SharedRuntime::print_statistics() {
1635 ttyLocker ttyl;
1636 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
1637
1638 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr);
1639 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr);
1640 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
1641
1642 SharedRuntime::print_ic_miss_histogram();
1643
1644 if (CountRemovableExceptions) {
1645 if (_nof_removable_exceptions > 0) {
1646 Unimplemented(); // this counter is not yet incremented
1647 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
1648 }
1649 }
1650
1651 // Dump the JRT_ENTRY counters
1652 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
1653 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);
1654 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
1655 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
1656 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
1657 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
1658 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
1659
1660 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );
1661 tty->print_cr("%5d wrong method", _wrong_method_ctr );
1662 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );
1663 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );
1664 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );
1665
1666 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );
1667 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );
1668 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );
1669 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );
1670 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );
1671 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );
1672 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );
1673 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );
1674 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );
1675 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );
1676 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );
1677 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );
1678 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );
1679 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );
1680 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );
1681 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );
1682
1683 if (xtty != NULL) xtty->tail("statistics");
1684 }
1685
1686 inline double percent(int x, int y) {
1687 return 100.0 * x / MAX2(y, 1);
1688 }
1689
1690 class MethodArityHistogram {
1691 public:
1692 enum { MAX_ARITY = 256 };
1693 private:
1694 static int _arity_histogram[MAX_ARITY]; // histogram of #args
1695 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
1696 static int _max_arity; // max. arity seen
1697 static int _max_size; // max. arg size seen
1698
1699 static void add_method_to_histogram(nmethod* nm) {
1700 methodOop m = nm->method();
1701 ArgumentCount args(m->signature());
1702 int arity = args.size() + (m->is_static() ? 0 : 1);
1703 int argsize = m->size_of_parameters();
1704 arity = MIN2(arity, MAX_ARITY-1);
1705 argsize = MIN2(argsize, MAX_ARITY-1);
1706 int count = nm->method()->compiled_invocation_count();
1707 _arity_histogram[arity] += count;
1708 _size_histogram[argsize] += count;
1709 _max_arity = MAX2(_max_arity, arity);
1710 _max_size = MAX2(_max_size, argsize);
1711 }
1712
1713 void print_histogram_helper(int n, int* histo, const char* name) {
1714 const int N = MIN2(5, n);
1715 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1716 double sum = 0;
1717 double weighted_sum = 0;
1718 int i;
1719 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
1720 double rest = sum;
1721 double percent = sum / 100;
1722 for (i = 0; i <= N; i++) {
1723 rest -= histo[i];
1724 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
1725 }
1726 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
1727 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
1728 }
1729
1730 void print_histogram() {
1731 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1732 print_histogram_helper(_max_arity, _arity_histogram, "arity");
1733 tty->print_cr("\nSame for parameter size (in words):");
1734 print_histogram_helper(_max_size, _size_histogram, "size");
1735 tty->cr();
1736 }
1737
1738 public:
1739 MethodArityHistogram() {
1740 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1741 _max_arity = _max_size = 0;
1742 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;
1743 CodeCache::nmethods_do(add_method_to_histogram);
1744 print_histogram();
1745 }
1746 };
1747
1748 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
1749 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
1750 int MethodArityHistogram::_max_arity;
1751 int MethodArityHistogram::_max_size;
1752
1753 void SharedRuntime::print_call_statistics(int comp_total) {
1754 tty->print_cr("Calls from compiled code:");
1755 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
1756 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
1757 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
1758 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
1759 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
1760 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
1761 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
1762 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
1763 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
1764 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
1765 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
1766 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
1767 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
1768 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
1769 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
1770 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
1771 tty->cr();
1772 tty->print_cr("Note 1: counter updates are not MT-safe.");
1773 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
1774 tty->print_cr(" %% in nested categories are relative to their category");
1775 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
1776 tty->cr();
1777
1778 MethodArityHistogram h;
1779 }
1780 #endif
1781
1782
1783 // ---------------------------------------------------------------------------
1784 // Implementation of AdapterHandlerLibrary
1785 const char* AdapterHandlerEntry::name = "I2C/C2I adapters";
1786 GrowableArray<uint64_t>* AdapterHandlerLibrary::_fingerprints = NULL;
1787 GrowableArray<AdapterHandlerEntry* >* AdapterHandlerLibrary::_handlers = NULL;
1788 const int AdapterHandlerLibrary_size = 16*K;
1789 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
1790
1791 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
1792 // Should be called only when AdapterHandlerLibrary_lock is active.
1793 if (_buffer == NULL) // Initialize lazily
1794 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
1795 return _buffer;
1796 }
1797
1798 void AdapterHandlerLibrary::initialize() {
1799 if (_fingerprints != NULL) return;
1800 _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true);
1801 _handlers = new(ResourceObj::C_HEAP)GrowableArray<AdapterHandlerEntry*>(32, true);
1802 // Index 0 reserved for the slow path handler
1803 _fingerprints->append(0/*the never-allowed 0 fingerprint*/);
1804 _handlers->append(NULL);
1805
1806 // Create a special handler for abstract methods. Abstract methods
1807 // are never compiled so an i2c entry is somewhat meaningless, but
1808 // fill it in with something appropriate just in case. Pass handle
1809 // wrong method for the c2i transitions.
1810 address wrong_method = SharedRuntime::get_handle_wrong_method_stub();
1811 _fingerprints->append(0/*the never-allowed 0 fingerprint*/);
1812 assert(_handlers->length() == AbstractMethodHandler, "in wrong slot");
1813 _handlers->append(new AdapterHandlerEntry(StubRoutines::throw_AbstractMethodError_entry(),
1814 wrong_method, wrong_method));
1815 }
1816
1817 int AdapterHandlerLibrary::get_create_adapter_index(methodHandle method) {
1818 // Use customized signature handler. Need to lock around updates to the
1819 // _fingerprints array (it is not safe for concurrent readers and a single
1820 // writer: this can be fixed if it becomes a problem).
1821
1822 // Get the address of the ic_miss handlers before we grab the
1823 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which
1824 // was caused by the initialization of the stubs happening
1825 // while we held the lock and then notifying jvmti while
1826 // holding it. This just forces the initialization to be a little
1827 // earlier.
1828 address ic_miss = SharedRuntime::get_ic_miss_stub();
1829 assert(ic_miss != NULL, "must have handler");
1830
1831 int result;
1832 NOT_PRODUCT(int code_size);
1833 BufferBlob *B = NULL;
1834 AdapterHandlerEntry* entry = NULL;
1835 uint64_t fingerprint;
1836 {
1837 MutexLocker mu(AdapterHandlerLibrary_lock);
1838 // make sure data structure is initialized
1839 initialize();
1840
1841 if (method->is_abstract()) {
1842 return AbstractMethodHandler;
1843 }
1844
1845 // Lookup method signature's fingerprint
1846 fingerprint = Fingerprinter(method).fingerprint();
1847 assert( fingerprint != CONST64( 0), "no zero fingerprints allowed" );
1848 // Fingerprints are small fixed-size condensed representations of
1849 // signatures. If the signature is too large, it won't fit in a
1850 // fingerprint. Signatures which cannot support a fingerprint get a new i2c
1851 // adapter gen'd each time, instead of searching the cache for one. This -1
1852 // game can be avoided if I compared signatures instead of using
1853 // fingerprints. However, -1 fingerprints are very rare.
1854 if( fingerprint != UCONST64(-1) ) { // If this is a cache-able fingerprint
1855 // Turns out i2c adapters do not care what the return value is. Mask it
1856 // out so signatures that only differ in return type will share the same
1857 // adapter.
1858 fingerprint &= ~(SignatureIterator::result_feature_mask << SignatureIterator::static_feature_size);
1859 // Search for a prior existing i2c/c2i adapter
1860 int index = _fingerprints->find(fingerprint);
1861 if( index >= 0 ) return index; // Found existing handlers?
1862 } else {
1863 // Annoyingly, I end up adding -1 fingerprints to the array of handlers,
1864 // because I need a unique handler index. It cannot be scanned for
1865 // because all -1's look alike. Instead, the matching index is passed out
1866 // and immediately used to collect the 2 return values (the c2i and i2c
1867 // adapters).
1868 }
1869
1870 // Create I2C & C2I handlers
1871 ResourceMark rm;
1872
1873 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
1874 if (buf != NULL) {
1875 CodeBuffer buffer(buf->instructions_begin(), buf->instructions_size());
1876 short buffer_locs[20];
1877 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
1878 sizeof(buffer_locs)/sizeof(relocInfo));
1879 MacroAssembler _masm(&buffer);
1880
1881 // Fill in the signature array, for the calling-convention call.
1882 int total_args_passed = method->size_of_parameters(); // All args on stack
1883
1884 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed);
1885 VMRegPair * regs = NEW_RESOURCE_ARRAY(VMRegPair ,total_args_passed);
1886 int i=0;
1887 if( !method->is_static() ) // Pass in receiver first
1888 sig_bt[i++] = T_OBJECT;
1889 for( SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
1890 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
1891 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
1892 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
1893 }
1894 assert( i==total_args_passed, "" );
1895
1896 // Now get the re-packed compiled-Java layout.
1897 int comp_args_on_stack;
1898
1899 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
1900 comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
1901
1902 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
1903 total_args_passed,
1904 comp_args_on_stack,
1905 sig_bt,
1906 regs);
1907
1908 B = BufferBlob::create(AdapterHandlerEntry::name, &buffer);
1909 NOT_PRODUCT(code_size = buffer.code_size());
1910 }
1911 if (B == NULL) {
1912 // CodeCache is full, disable compilation
1913 // Ought to log this but compile log is only per compile thread
1914 // and we're some non descript Java thread.
1915 UseInterpreter = true;
1916 if (UseCompiler || AlwaysCompileLoopMethods ) {
1917 #ifndef PRODUCT
1918 warning("CodeCache is full. Compiler has been disabled");
1919 if (CompileTheWorld || ExitOnFullCodeCache) {
1920 before_exit(JavaThread::current());
1921 exit_globals(); // will delete tty
1922 vm_direct_exit(CompileTheWorld ? 0 : 1);
1923 }
1924 #endif
1925 UseCompiler = false;
1926 AlwaysCompileLoopMethods = false;
1927 }
1928 return 0; // Out of CodeCache space (_handlers[0] == NULL)
1929 }
1930 entry->relocate(B->instructions_begin());
1931 #ifndef PRODUCT
1932 // debugging suppport
1933 if (PrintAdapterHandlers) {
1934 tty->cr();
1935 tty->print_cr("i2c argument handler #%d for: %s %s (fingerprint = 0x%llx, %d bytes generated)",
1936 _handlers->length(), (method->is_static() ? "static" : "receiver"),
1937 method->signature()->as_C_string(), fingerprint, code_size );
1938 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
1939 Disassembler::decode(entry->get_i2c_entry(), entry->get_i2c_entry() + code_size);
1940 }
1941 #endif
1942
1943 // add handlers to library
1944 _fingerprints->append(fingerprint);
1945 _handlers->append(entry);
1946 // set handler index
1947 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1948 result = _fingerprints->length() - 1;
1949 }
1950 // Outside of the lock
1951 if (B != NULL) {
1952 char blob_id[256];
1953 jio_snprintf(blob_id,
1954 sizeof(blob_id),
1955 "%s(" PTR64_FORMAT ")@" PTR_FORMAT,
1956 AdapterHandlerEntry::name,
1957 fingerprint,
1958 B->instructions_begin());
1959 VTune::register_stub(blob_id, B->instructions_begin(), B->instructions_end());
1960 Forte::register_stub(blob_id, B->instructions_begin(), B->instructions_end());
1961
1962 if (JvmtiExport::should_post_dynamic_code_generated()) {
1963 JvmtiExport::post_dynamic_code_generated(blob_id,
1964 B->instructions_begin(),
1965 B->instructions_end());
1966 }
1967 }
1968 return result;
1969 }
1970
1971 void AdapterHandlerEntry::relocate(address new_base) {
1972 ptrdiff_t delta = new_base - _i2c_entry;
1973 _i2c_entry += delta;
1974 _c2i_entry += delta;
1975 _c2i_unverified_entry += delta;
1976 }
1977
1978 // Create a native wrapper for this native method. The wrapper converts the
1979 // java compiled calling convention to the native convention, handlizes
1980 // arguments, and transitions to native. On return from the native we transition
1981 // back to java blocking if a safepoint is in progress.
1982 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {
1983 ResourceMark rm;
1984 nmethod* nm = NULL;
1985
1986 if (PrintCompilation) {
1987 ttyLocker ttyl;
1988 tty->print("--- n%s ", (method->is_synchronized() ? "s" : " "));
1989 method->print_short_name(tty);
1990 if (method->is_static()) {
1991 tty->print(" (static)");
1992 }
1993 tty->cr();
1994 }
1995
1996 assert(method->has_native_function(), "must have something valid to call!");
1997
1998 {
1999 // perform the work while holding the lock, but perform any printing outside the lock
2000 MutexLocker mu(AdapterHandlerLibrary_lock);
2001 // See if somebody beat us to it
2002 nm = method->code();
2003 if (nm) {
2004 return nm;
2005 }
2006
2007 ResourceMark rm;
2008
2009 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2010 if (buf != NULL) {
2011 CodeBuffer buffer(buf->instructions_begin(), buf->instructions_size());
2012 double locs_buf[20];
2013 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2014 MacroAssembler _masm(&buffer);
2015
2016 // Fill in the signature array, for the calling-convention call.
2017 int total_args_passed = method->size_of_parameters();
2018
2019 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed);
2020 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair,total_args_passed);
2021 int i=0;
2022 if( !method->is_static() ) // Pass in receiver first
2023 sig_bt[i++] = T_OBJECT;
2024 SignatureStream ss(method->signature());
2025 for( ; !ss.at_return_type(); ss.next()) {
2026 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2027 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2028 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2029 }
2030 assert( i==total_args_passed, "" );
2031 BasicType ret_type = ss.type();
2032
2033 // Now get the compiled-Java layout as input arguments
2034 int comp_args_on_stack;
2035 comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2036
2037 // Generate the compiled-to-native wrapper code
2038 nm = SharedRuntime::generate_native_wrapper(&_masm,
2039 method,
2040 total_args_passed,
2041 comp_args_on_stack,
2042 sig_bt,regs,
2043 ret_type);
2044 }
2045 }
2046
2047 // Must unlock before calling set_code
2048 // Install the generated code.
2049 if (nm != NULL) {
2050 method->set_code(method, nm);
2051 nm->post_compiled_method_load_event();
2052 } else {
2053 // CodeCache is full, disable compilation
2054 // Ought to log this but compile log is only per compile thread
2055 // and we're some non descript Java thread.
2056 UseInterpreter = true;
2057 if (UseCompiler || AlwaysCompileLoopMethods ) {
2058 #ifndef PRODUCT
2059 warning("CodeCache is full. Compiler has been disabled");
2060 if (CompileTheWorld || ExitOnFullCodeCache) {
2061 before_exit(JavaThread::current());
2062 exit_globals(); // will delete tty
2063 vm_direct_exit(CompileTheWorld ? 0 : 1);
2064 }
2065 #endif
2066 UseCompiler = false;
2067 AlwaysCompileLoopMethods = false;
2068 }
2069 }
2070 return nm;
2071 }
2072
2073 #ifdef HAVE_DTRACE_H
2074 // Create a dtrace nmethod for this method. The wrapper converts the
2075 // java compiled calling convention to the native convention, makes a dummy call
2076 // (actually nops for the size of the call instruction, which become a trap if
2077 // probe is enabled). The returns to the caller. Since this all looks like a
2078 // leaf no thread transition is needed.
2079
2080 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
2081 ResourceMark rm;
2082 nmethod* nm = NULL;
2083
2084 if (PrintCompilation) {
2085 ttyLocker ttyl;
2086 tty->print("--- n%s ");
2087 method->print_short_name(tty);
2088 if (method->is_static()) {
2089 tty->print(" (static)");
2090 }
2091 tty->cr();
2092 }
2093
2094 {
2095 // perform the work while holding the lock, but perform any printing
2096 // outside the lock
2097 MutexLocker mu(AdapterHandlerLibrary_lock);
2098 // See if somebody beat us to it
2099 nm = method->code();
2100 if (nm) {
2101 return nm;
2102 }
2103
2104 ResourceMark rm;
2105
2106 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2107 if (buf != NULL) {
2108 CodeBuffer buffer(buf->instructions_begin(), buf->instructions_size());
2109 // Need a few relocation entries
2110 double locs_buf[20];
2111 buffer.insts()->initialize_shared_locs(
2112 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2113 MacroAssembler _masm(&buffer);
2114
2115 // Generate the compiled-to-native wrapper code
2116 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
2117 }
2118 }
2119 return nm;
2120 }
2121
2122 // the dtrace method needs to convert java lang string to utf8 string.
2123 void SharedRuntime::get_utf(oopDesc* src, address dst) {
2124 typeArrayOop jlsValue = java_lang_String::value(src);
2125 int jlsOffset = java_lang_String::offset(src);
2126 int jlsLen = java_lang_String::length(src);
2127 jchar* jlsPos = (jlsLen == 0) ? NULL :
2128 jlsValue->char_at_addr(jlsOffset);
2129 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
2130 }
2131 #endif // ndef HAVE_DTRACE_H
2132
2133 // -------------------------------------------------------------------------
2134 // Java-Java calling convention
2135 // (what you use when Java calls Java)
2136
2137 //------------------------------name_for_receiver----------------------------------
2138 // For a given signature, return the VMReg for parameter 0.
2139 VMReg SharedRuntime::name_for_receiver() {
2140 VMRegPair regs;
2141 BasicType sig_bt = T_OBJECT;
2142 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2143 // Return argument 0 register. In the LP64 build pointers
2144 // take 2 registers, but the VM wants only the 'main' name.
2145 return regs.first();
2146 }
2147
2148 VMRegPair *SharedRuntime::find_callee_arguments(symbolOop sig, bool is_static, int* arg_size) {
2149 // This method is returning a data structure allocating as a
2150 // ResourceObject, so do not put any ResourceMarks in here.
2151 char *s = sig->as_C_string();
2152 int len = (int)strlen(s);
2153 *s++; len--; // Skip opening paren
2154 char *t = s+len;
2155 while( *(--t) != ')' ) ; // Find close paren
2156
2157 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );
2158 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );
2159 int cnt = 0;
2160 if (!is_static) {
2161 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2162 }
2163
2164 while( s < t ) {
2165 switch( *s++ ) { // Switch on signature character
2166 case 'B': sig_bt[cnt++] = T_BYTE; break;
2167 case 'C': sig_bt[cnt++] = T_CHAR; break;
2168 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2169 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2170 case 'I': sig_bt[cnt++] = T_INT; break;
2171 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2172 case 'S': sig_bt[cnt++] = T_SHORT; break;
2173 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2174 case 'V': sig_bt[cnt++] = T_VOID; break;
2175 case 'L': // Oop
2176 while( *s++ != ';' ) ; // Skip signature
2177 sig_bt[cnt++] = T_OBJECT;
2178 break;
2179 case '[': { // Array
2180 do { // Skip optional size
2181 while( *s >= '0' && *s <= '9' ) s++;
2182 } while( *s++ == '[' ); // Nested arrays?
2183 // Skip element type
2184 if( s[-1] == 'L' )
2185 while( *s++ != ';' ) ; // Skip signature
2186 sig_bt[cnt++] = T_ARRAY;
2187 break;
2188 }
2189 default : ShouldNotReachHere();
2190 }
2191 }
2192 assert( cnt < 256, "grow table size" );
2193
2194 int comp_args_on_stack;
2195 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2196
2197 // the calling convention doesn't count out_preserve_stack_slots so
2198 // we must add that in to get "true" stack offsets.
2199
2200 if (comp_args_on_stack) {
2201 for (int i = 0; i < cnt; i++) {
2202 VMReg reg1 = regs[i].first();
2203 if( reg1->is_stack()) {
2204 // Yuck
2205 reg1 = reg1->bias(out_preserve_stack_slots());
2206 }
2207 VMReg reg2 = regs[i].second();
2208 if( reg2->is_stack()) {
2209 // Yuck
2210 reg2 = reg2->bias(out_preserve_stack_slots());
2211 }
2212 regs[i].set_pair(reg2, reg1);
2213 }
2214 }
2215
2216 // results
2217 *arg_size = cnt;
2218 return regs;
2219 }
2220
2221 // OSR Migration Code
2222 //
2223 // This code is used convert interpreter frames into compiled frames. It is
2224 // called from very start of a compiled OSR nmethod. A temp array is
2225 // allocated to hold the interesting bits of the interpreter frame. All
2226 // active locks are inflated to allow them to move. The displaced headers and
2227 // active interpeter locals are copied into the temp buffer. Then we return
2228 // back to the compiled code. The compiled code then pops the current
2229 // interpreter frame off the stack and pushes a new compiled frame. Then it
2230 // copies the interpreter locals and displaced headers where it wants.
2231 // Finally it calls back to free the temp buffer.
2232 //
2233 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2234
2235 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2236
2237 #ifdef IA64
2238 ShouldNotReachHere(); // NYI
2239 #endif /* IA64 */
2240
2241 //
2242 // This code is dependent on the memory layout of the interpreter local
2243 // array and the monitors. On all of our platforms the layout is identical
2244 // so this code is shared. If some platform lays the their arrays out
2245 // differently then this code could move to platform specific code or
2246 // the code here could be modified to copy items one at a time using
2247 // frame accessor methods and be platform independent.
2248
2249 frame fr = thread->last_frame();
2250 assert( fr.is_interpreted_frame(), "" );
2251 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );
2252
2253 // Figure out how many monitors are active.
2254 int active_monitor_count = 0;
2255 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2256 kptr < fr.interpreter_frame_monitor_begin();
2257 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2258 if( kptr->obj() != NULL ) active_monitor_count++;
2259 }
2260
2261 // QQQ we could place number of active monitors in the array so that compiled code
2262 // could double check it.
2263
2264 methodOop moop = fr.interpreter_frame_method();
2265 int max_locals = moop->max_locals();
2266 // Allocate temp buffer, 1 word per local & 2 per active monitor
2267 int buf_size_words = max_locals + active_monitor_count*2;
2268 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words);
2269
2270 // Copy the locals. Order is preserved so that loading of longs works.
2271 // Since there's no GC I can copy the oops blindly.
2272 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2273 if (TaggedStackInterpreter) {
2274 for (int i = 0; i < max_locals; i++) {
2275 // copy only each local separately to the buffer avoiding the tag
2276 buf[i] = *fr.interpreter_frame_local_at(max_locals-i-1);
2277 }
2278 } else {
2279 Copy::disjoint_words(
2280 (HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2281 (HeapWord*)&buf[0],
2282 max_locals);
2283 }
2284
2285 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2286 int i = max_locals;
2287 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2288 kptr2 < fr.interpreter_frame_monitor_begin();
2289 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2290 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2291 BasicLock *lock = kptr2->lock();
2292 // Inflate so the displaced header becomes position-independent
2293 if (lock->displaced_header()->is_unlocked())
2294 ObjectSynchronizer::inflate_helper(kptr2->obj());
2295 // Now the displaced header is free to move
2296 buf[i++] = (intptr_t)lock->displaced_header();
2297 buf[i++] = (intptr_t)kptr2->obj();
2298 }
2299 }
2300 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );
2301
2302 return buf;
2303 JRT_END
2304
2305 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2306 FREE_C_HEAP_ARRAY(intptr_t,buf);
2307 JRT_END
2308
2309 #ifndef PRODUCT
2310 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
2311
2312 if (_handlers == NULL) return false;
2313
2314 for (int i = 0 ; i < _handlers->length() ; i++) {
2315 AdapterHandlerEntry* a = get_entry(i);
2316 if ( a != NULL && b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
2317 }
2318 return false;
2319 }
2320
2321 void AdapterHandlerLibrary::print_handler(CodeBlob* b) {
2322
2323 for (int i = 0 ; i < _handlers->length() ; i++) {
2324 AdapterHandlerEntry* a = get_entry(i);
2325 if ( a != NULL && b == CodeCache::find_blob(a->get_i2c_entry()) ) {
2326 tty->print("Adapter for signature: ");
2327 // Fingerprinter::print(_fingerprints->at(i));
2328 tty->print("0x%" FORMAT64_MODIFIER "x", _fingerprints->at(i));
2329 tty->print_cr(" i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
2330 a->get_i2c_entry(), a->get_c2i_entry(), a->get_c2i_unverified_entry());
2331
2332 return;
2333 }
2334 }
2335 assert(false, "Should have found handler");
2336 }
2337 #endif /* PRODUCT */