Mercurial > hg > truffle
comparison src/share/vm/runtime/sharedRuntime.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | f8236e79048a 9785f6d2dd97 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 1997-2007 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 | |
115 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x)) | |
116 return x * y; | |
117 JRT_END | |
118 | |
119 | |
120 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x)) | |
121 if (x == min_jlong && y == CONST64(-1)) { | |
122 return x; | |
123 } else { | |
124 return x / y; | |
125 } | |
126 JRT_END | |
127 | |
128 | |
129 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x)) | |
130 if (x == min_jlong && y == CONST64(-1)) { | |
131 return 0; | |
132 } else { | |
133 return x % y; | |
134 } | |
135 JRT_END | |
136 | |
137 | |
138 const juint float_sign_mask = 0x7FFFFFFF; | |
139 const juint float_infinity = 0x7F800000; | |
140 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF); | |
141 const julong double_infinity = CONST64(0x7FF0000000000000); | |
142 | |
143 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y)) | |
144 #ifdef _WIN64 | |
145 // 64-bit Windows on amd64 returns the wrong values for | |
146 // infinity operands. | |
147 union { jfloat f; juint i; } xbits, ybits; | |
148 xbits.f = x; | |
149 ybits.f = y; | |
150 // x Mod Infinity == x unless x is infinity | |
151 if ( ((xbits.i & float_sign_mask) != float_infinity) && | |
152 ((ybits.i & float_sign_mask) == float_infinity) ) { | |
153 return x; | |
154 } | |
155 #endif | |
156 return ((jfloat)fmod((double)x,(double)y)); | |
157 JRT_END | |
158 | |
159 | |
160 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y)) | |
161 #ifdef _WIN64 | |
162 union { jdouble d; julong l; } xbits, ybits; | |
163 xbits.d = x; | |
164 ybits.d = y; | |
165 // x Mod Infinity == x unless x is infinity | |
166 if ( ((xbits.l & double_sign_mask) != double_infinity) && | |
167 ((ybits.l & double_sign_mask) == double_infinity) ) { | |
168 return x; | |
169 } | |
170 #endif | |
171 return ((jdouble)fmod((double)x,(double)y)); | |
172 JRT_END | |
173 | |
174 | |
175 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x)) | |
176 if (g_isnan(x)) {return 0;} | |
177 jlong lltmp = (jlong)x; | |
178 jint ltmp = (jint)lltmp; | |
179 if (ltmp == lltmp) { | |
180 return ltmp; | |
181 } else { | |
182 if (x < 0) { | |
183 return min_jint; | |
184 } else { | |
185 return max_jint; | |
186 } | |
187 } | |
188 JRT_END | |
189 | |
190 | |
191 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x)) | |
192 if (g_isnan(x)) {return 0;} | |
193 jlong lltmp = (jlong)x; | |
194 if (lltmp != min_jlong) { | |
195 return lltmp; | |
196 } else { | |
197 if (x < 0) { | |
198 return min_jlong; | |
199 } else { | |
200 return max_jlong; | |
201 } | |
202 } | |
203 JRT_END | |
204 | |
205 | |
206 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x)) | |
207 if (g_isnan(x)) {return 0;} | |
208 jlong lltmp = (jlong)x; | |
209 jint ltmp = (jint)lltmp; | |
210 if (ltmp == lltmp) { | |
211 return ltmp; | |
212 } else { | |
213 if (x < 0) { | |
214 return min_jint; | |
215 } else { | |
216 return max_jint; | |
217 } | |
218 } | |
219 JRT_END | |
220 | |
221 | |
222 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x)) | |
223 if (g_isnan(x)) {return 0;} | |
224 jlong lltmp = (jlong)x; | |
225 if (lltmp != min_jlong) { | |
226 return lltmp; | |
227 } else { | |
228 if (x < 0) { | |
229 return min_jlong; | |
230 } else { | |
231 return max_jlong; | |
232 } | |
233 } | |
234 JRT_END | |
235 | |
236 | |
237 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x)) | |
238 return (jfloat)x; | |
239 JRT_END | |
240 | |
241 | |
242 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x)) | |
243 return (jfloat)x; | |
244 JRT_END | |
245 | |
246 | |
247 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x)) | |
248 return (jdouble)x; | |
249 JRT_END | |
250 | |
251 // Exception handling accross interpreter/compiler boundaries | |
252 // | |
253 // exception_handler_for_return_address(...) returns the continuation address. | |
254 // The continuation address is the entry point of the exception handler of the | |
255 // previous frame depending on the return address. | |
256 | |
257 address SharedRuntime::raw_exception_handler_for_return_address(address return_address) { | |
258 assert(frame::verify_return_pc(return_address), "must be a return pc"); | |
259 | |
260 // the fastest case first | |
261 CodeBlob* blob = CodeCache::find_blob(return_address); | |
262 if (blob != NULL && blob->is_nmethod()) { | |
263 nmethod* code = (nmethod*)blob; | |
264 assert(code != NULL, "nmethod must be present"); | |
265 // native nmethods don't have exception handlers | |
266 assert(!code->is_native_method(), "no exception handler"); | |
267 assert(code->header_begin() != code->exception_begin(), "no exception handler"); | |
268 if (code->is_deopt_pc(return_address)) { | |
269 return SharedRuntime::deopt_blob()->unpack_with_exception(); | |
270 } else { | |
271 return code->exception_begin(); | |
272 } | |
273 } | |
274 | |
275 // Entry code | |
276 if (StubRoutines::returns_to_call_stub(return_address)) { | |
277 return StubRoutines::catch_exception_entry(); | |
278 } | |
279 // Interpreted code | |
280 if (Interpreter::contains(return_address)) { | |
281 return Interpreter::rethrow_exception_entry(); | |
282 } | |
283 | |
284 // Compiled code | |
285 if (CodeCache::contains(return_address)) { | |
286 CodeBlob* blob = CodeCache::find_blob(return_address); | |
287 if (blob->is_nmethod()) { | |
288 nmethod* code = (nmethod*)blob; | |
289 assert(code != NULL, "nmethod must be present"); | |
290 assert(code->header_begin() != code->exception_begin(), "no exception handler"); | |
291 return code->exception_begin(); | |
292 } | |
293 if (blob->is_runtime_stub()) { | |
294 ShouldNotReachHere(); // callers are responsible for skipping runtime stub frames | |
295 } | |
296 } | |
297 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!"); | |
298 #ifndef PRODUCT | |
299 { ResourceMark rm; | |
300 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address); | |
301 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here"); | |
302 tty->print_cr("b) other problem"); | |
303 } | |
304 #endif // PRODUCT | |
305 ShouldNotReachHere(); | |
306 return NULL; | |
307 } | |
308 | |
309 | |
310 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(address return_address)) | |
311 return raw_exception_handler_for_return_address(return_address); | |
312 JRT_END | |
313 | |
314 address SharedRuntime::get_poll_stub(address pc) { | |
315 address stub; | |
316 // Look up the code blob | |
317 CodeBlob *cb = CodeCache::find_blob(pc); | |
318 | |
319 // Should be an nmethod | |
320 assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" ); | |
321 | |
322 // Look up the relocation information | |
323 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc), | |
324 "safepoint polling: type must be poll" ); | |
325 | |
326 assert( ((NativeInstruction*)pc)->is_safepoint_poll(), | |
327 "Only polling locations are used for safepoint"); | |
328 | |
329 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc); | |
330 if (at_poll_return) { | |
331 assert(SharedRuntime::polling_page_return_handler_blob() != NULL, | |
332 "polling page return stub not created yet"); | |
333 stub = SharedRuntime::polling_page_return_handler_blob()->instructions_begin(); | |
334 } else { | |
335 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL, | |
336 "polling page safepoint stub not created yet"); | |
337 stub = SharedRuntime::polling_page_safepoint_handler_blob()->instructions_begin(); | |
338 } | |
339 #ifndef PRODUCT | |
340 if( TraceSafepoint ) { | |
341 char buf[256]; | |
342 jio_snprintf(buf, sizeof(buf), | |
343 "... found polling page %s exception at pc = " | |
344 INTPTR_FORMAT ", stub =" INTPTR_FORMAT, | |
345 at_poll_return ? "return" : "loop", | |
346 (intptr_t)pc, (intptr_t)stub); | |
347 tty->print_raw_cr(buf); | |
348 } | |
349 #endif // PRODUCT | |
350 return stub; | |
351 } | |
352 | |
353 | |
354 oop SharedRuntime::retrieve_receiver( symbolHandle sig, frame caller ) { | |
355 assert(caller.is_interpreted_frame(), ""); | |
356 int args_size = ArgumentSizeComputer(sig).size() + 1; | |
357 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack"); | |
358 oop result = (oop) *caller.interpreter_frame_tos_at(args_size - 1); | |
359 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop"); | |
360 return result; | |
361 } | |
362 | |
363 | |
364 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) { | |
365 if (JvmtiExport::can_post_exceptions()) { | |
366 vframeStream vfst(thread, true); | |
367 methodHandle method = methodHandle(thread, vfst.method()); | |
368 address bcp = method()->bcp_from(vfst.bci()); | |
369 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception()); | |
370 } | |
371 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception); | |
372 } | |
373 | |
374 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message) { | |
375 Handle h_exception = Exceptions::new_exception(thread, name, message); | |
376 throw_and_post_jvmti_exception(thread, h_exception); | |
377 } | |
378 | |
379 // ret_pc points into caller; we are returning caller's exception handler | |
380 // for given exception | |
381 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception, | |
382 bool force_unwind, bool top_frame_only) { | |
383 assert(nm != NULL, "must exist"); | |
384 ResourceMark rm; | |
385 | |
386 ScopeDesc* sd = nm->scope_desc_at(ret_pc); | |
387 // determine handler bci, if any | |
388 EXCEPTION_MARK; | |
389 | |
390 int handler_bci = -1; | |
391 int scope_depth = 0; | |
392 if (!force_unwind) { | |
393 int bci = sd->bci(); | |
394 do { | |
395 bool skip_scope_increment = false; | |
396 // exception handler lookup | |
397 KlassHandle ek (THREAD, exception->klass()); | |
398 handler_bci = sd->method()->fast_exception_handler_bci_for(ek, bci, THREAD); | |
399 if (HAS_PENDING_EXCEPTION) { | |
400 // We threw an exception while trying to find the exception handler. | |
401 // Transfer the new exception to the exception handle which will | |
402 // be set into thread local storage, and do another lookup for an | |
403 // exception handler for this exception, this time starting at the | |
404 // BCI of the exception handler which caused the exception to be | |
405 // thrown (bugs 4307310 and 4546590). Set "exception" reference | |
406 // argument to ensure that the correct exception is thrown (4870175). | |
407 exception = Handle(THREAD, PENDING_EXCEPTION); | |
408 CLEAR_PENDING_EXCEPTION; | |
409 if (handler_bci >= 0) { | |
410 bci = handler_bci; | |
411 handler_bci = -1; | |
412 skip_scope_increment = true; | |
413 } | |
414 } | |
415 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) { | |
416 sd = sd->sender(); | |
417 if (sd != NULL) { | |
418 bci = sd->bci(); | |
419 } | |
420 ++scope_depth; | |
421 } | |
422 } while (!top_frame_only && handler_bci < 0 && sd != NULL); | |
423 } | |
424 | |
425 // found handling method => lookup exception handler | |
426 int catch_pco = ret_pc - nm->instructions_begin(); | |
427 | |
428 ExceptionHandlerTable table(nm); | |
429 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth); | |
430 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) { | |
431 // Allow abbreviated catch tables. The idea is to allow a method | |
432 // to materialize its exceptions without committing to the exact | |
433 // routing of exceptions. In particular this is needed for adding | |
434 // a synthethic handler to unlock monitors when inlining | |
435 // synchonized methods since the unlock path isn't represented in | |
436 // the bytecodes. | |
437 t = table.entry_for(catch_pco, -1, 0); | |
438 } | |
439 | |
440 #ifdef COMPILER1 | |
441 if (nm->is_compiled_by_c1() && t == NULL && handler_bci == -1) { | |
442 // Exception is not handled by this frame so unwind. Note that | |
443 // this is not the same as how C2 does this. C2 emits a table | |
444 // entry that dispatches to the unwind code in the nmethod. | |
445 return NULL; | |
446 } | |
447 #endif /* COMPILER1 */ | |
448 | |
449 | |
450 if (t == NULL) { | |
451 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci); | |
452 tty->print_cr(" Exception:"); | |
453 exception->print(); | |
454 tty->cr(); | |
455 tty->print_cr(" Compiled exception table :"); | |
456 table.print(); | |
457 nm->print_code(); | |
458 guarantee(false, "missing exception handler"); | |
459 return NULL; | |
460 } | |
461 | |
462 return nm->instructions_begin() + t->pco(); | |
463 } | |
464 | |
465 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread)) | |
466 // These errors occur only at call sites | |
467 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError()); | |
468 JRT_END | |
469 | |
470 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread)) | |
471 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); | |
472 JRT_END | |
473 | |
474 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread)) | |
475 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); | |
476 JRT_END | |
477 | |
478 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread)) | |
479 // This entry point is effectively only used for NullPointerExceptions which occur at inline | |
480 // cache sites (when the callee activation is not yet set up) so we are at a call site | |
481 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); | |
482 JRT_END | |
483 | |
484 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread)) | |
485 // We avoid using the normal exception construction in this case because | |
486 // it performs an upcall to Java, and we're already out of stack space. | |
487 klassOop k = SystemDictionary::StackOverflowError_klass(); | |
488 oop exception_oop = instanceKlass::cast(k)->allocate_instance(CHECK); | |
489 Handle exception (thread, exception_oop); | |
490 if (StackTraceInThrowable) { | |
491 java_lang_Throwable::fill_in_stack_trace(exception); | |
492 } | |
493 throw_and_post_jvmti_exception(thread, exception); | |
494 JRT_END | |
495 | |
496 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread, | |
497 address pc, | |
498 SharedRuntime::ImplicitExceptionKind exception_kind) | |
499 { | |
500 address target_pc = NULL; | |
501 | |
502 if (Interpreter::contains(pc)) { | |
503 #ifdef CC_INTERP | |
504 // C++ interpreter doesn't throw implicit exceptions | |
505 ShouldNotReachHere(); | |
506 #else | |
507 switch (exception_kind) { | |
508 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry(); | |
509 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry(); | |
510 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry(); | |
511 default: ShouldNotReachHere(); | |
512 } | |
513 #endif // !CC_INTERP | |
514 } else { | |
515 switch (exception_kind) { | |
516 case STACK_OVERFLOW: { | |
517 // Stack overflow only occurs upon frame setup; the callee is | |
518 // going to be unwound. Dispatch to a shared runtime stub | |
519 // which will cause the StackOverflowError to be fabricated | |
520 // and processed. | |
521 // For stack overflow in deoptimization blob, cleanup thread. | |
522 if (thread->deopt_mark() != NULL) { | |
523 Deoptimization::cleanup_deopt_info(thread, NULL); | |
524 } | |
525 return StubRoutines::throw_StackOverflowError_entry(); | |
526 } | |
527 | |
528 case IMPLICIT_NULL: { | |
529 if (VtableStubs::contains(pc)) { | |
530 // We haven't yet entered the callee frame. Fabricate an | |
531 // exception and begin dispatching it in the caller. Since | |
532 // the caller was at a call site, it's safe to destroy all | |
533 // caller-saved registers, as these entry points do. | |
534 VtableStub* vt_stub = VtableStubs::stub_containing(pc); | |
535 guarantee(vt_stub != NULL, "unable to find SEGVing vtable stub"); | |
536 if (vt_stub->is_abstract_method_error(pc)) { | |
537 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs"); | |
538 return StubRoutines::throw_AbstractMethodError_entry(); | |
539 } else { | |
540 return StubRoutines::throw_NullPointerException_at_call_entry(); | |
541 } | |
542 } else { | |
543 CodeBlob* cb = CodeCache::find_blob(pc); | |
544 guarantee(cb != NULL, "exception happened outside interpreter, nmethods and vtable stubs (1)"); | |
545 | |
546 // Exception happened in CodeCache. Must be either: | |
547 // 1. Inline-cache check in C2I handler blob, | |
548 // 2. Inline-cache check in nmethod, or | |
549 // 3. Implict null exception in nmethod | |
550 | |
551 if (!cb->is_nmethod()) { | |
552 guarantee(cb->is_adapter_blob(), | |
553 "exception happened outside interpreter, nmethods and vtable stubs (2)"); | |
554 // There is no handler here, so we will simply unwind. | |
555 return StubRoutines::throw_NullPointerException_at_call_entry(); | |
556 } | |
557 | |
558 // Otherwise, it's an nmethod. Consult its exception handlers. | |
559 nmethod* nm = (nmethod*)cb; | |
560 if (nm->inlinecache_check_contains(pc)) { | |
561 // exception happened inside inline-cache check code | |
562 // => the nmethod is not yet active (i.e., the frame | |
563 // is not set up yet) => use return address pushed by | |
564 // caller => don't push another return address | |
565 return StubRoutines::throw_NullPointerException_at_call_entry(); | |
566 } | |
567 | |
568 #ifndef PRODUCT | |
569 _implicit_null_throws++; | |
570 #endif | |
571 target_pc = nm->continuation_for_implicit_exception(pc); | |
572 guarantee(target_pc != 0, "must have a continuation point"); | |
573 } | |
574 | |
575 break; // fall through | |
576 } | |
577 | |
578 | |
579 case IMPLICIT_DIVIDE_BY_ZERO: { | |
580 nmethod* nm = CodeCache::find_nmethod(pc); | |
581 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions"); | |
582 #ifndef PRODUCT | |
583 _implicit_div0_throws++; | |
584 #endif | |
585 target_pc = nm->continuation_for_implicit_exception(pc); | |
586 guarantee(target_pc != 0, "must have a continuation point"); | |
587 break; // fall through | |
588 } | |
589 | |
590 default: ShouldNotReachHere(); | |
591 } | |
592 | |
593 guarantee(target_pc != NULL, "must have computed destination PC for implicit exception"); | |
594 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind"); | |
595 | |
596 // for AbortVMOnException flag | |
597 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException")); | |
598 if (exception_kind == IMPLICIT_NULL) { | |
599 Events::log("Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc); | |
600 } else { | |
601 Events::log("Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc); | |
602 } | |
603 return target_pc; | |
604 } | |
605 | |
606 ShouldNotReachHere(); | |
607 return NULL; | |
608 } | |
609 | |
610 | |
611 JNI_ENTRY(void, throw_unsatisfied_link_error(JNIEnv* env, ...)) | |
612 { | |
613 THROW(vmSymbols::java_lang_UnsatisfiedLinkError()); | |
614 } | |
615 JNI_END | |
616 | |
617 | |
618 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() { | |
619 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error); | |
620 } | |
621 | |
622 | |
623 #ifndef PRODUCT | |
624 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2)) | |
625 const frame f = thread->last_frame(); | |
626 assert(f.is_interpreted_frame(), "must be an interpreted frame"); | |
627 #ifndef PRODUCT | |
628 methodHandle mh(THREAD, f.interpreter_frame_method()); | |
629 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2); | |
630 #endif // !PRODUCT | |
631 return preserve_this_value; | |
632 JRT_END | |
633 #endif // !PRODUCT | |
634 | |
635 | |
636 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts)) | |
637 os::yield_all(attempts); | |
638 JRT_END | |
639 | |
640 | |
641 // --------------------------------------------------------------------------------------------------------- | |
642 // Non-product code | |
643 #ifndef PRODUCT | |
644 | |
645 void SharedRuntime::verify_caller_frame(frame caller_frame, methodHandle callee_method) { | |
646 ResourceMark rm; | |
647 assert (caller_frame.is_interpreted_frame(), "sanity check"); | |
648 assert (callee_method->has_compiled_code(), "callee must be compiled"); | |
649 methodHandle caller_method (Thread::current(), caller_frame.interpreter_frame_method()); | |
650 jint bci = caller_frame.interpreter_frame_bci(); | |
651 methodHandle method = find_callee_method_inside_interpreter(caller_frame, caller_method, bci); | |
652 assert (callee_method == method, "incorrect method"); | |
653 } | |
654 | |
655 methodHandle SharedRuntime::find_callee_method_inside_interpreter(frame caller_frame, methodHandle caller_method, int bci) { | |
656 EXCEPTION_MARK; | |
657 Bytecode_invoke* bytecode = Bytecode_invoke_at(caller_method, bci); | |
658 methodHandle staticCallee = bytecode->static_target(CATCH); // Non-product code | |
659 | |
660 bytecode = Bytecode_invoke_at(caller_method, bci); | |
661 int bytecode_index = bytecode->index(); | |
662 Bytecodes::Code bc = bytecode->adjusted_invoke_code(); | |
663 | |
664 Handle receiver; | |
665 if (bc == Bytecodes::_invokeinterface || | |
666 bc == Bytecodes::_invokevirtual || | |
667 bc == Bytecodes::_invokespecial) { | |
668 symbolHandle signature (THREAD, staticCallee->signature()); | |
669 receiver = Handle(THREAD, retrieve_receiver(signature, caller_frame)); | |
670 } else { | |
671 receiver = Handle(); | |
672 } | |
673 CallInfo result; | |
674 constantPoolHandle constants (THREAD, caller_method->constants()); | |
675 LinkResolver::resolve_invoke(result, receiver, constants, bytecode_index, bc, CATCH); // Non-product code | |
676 methodHandle calleeMethod = result.selected_method(); | |
677 return calleeMethod; | |
678 } | |
679 | |
680 #endif // PRODUCT | |
681 | |
682 | |
683 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj)) | |
684 assert(obj->is_oop(), "must be a valid oop"); | |
685 assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise"); | |
686 instanceKlass::register_finalizer(instanceOop(obj), CHECK); | |
687 JRT_END | |
688 | |
689 | |
690 jlong SharedRuntime::get_java_tid(Thread* thread) { | |
691 if (thread != NULL) { | |
692 if (thread->is_Java_thread()) { | |
693 oop obj = ((JavaThread*)thread)->threadObj(); | |
694 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj); | |
695 } | |
696 } | |
697 return 0; | |
698 } | |
699 | |
700 /** | |
701 * This function ought to be a void function, but cannot be because | |
702 * it gets turned into a tail-call on sparc, which runs into dtrace bug | |
703 * 6254741. Once that is fixed we can remove the dummy return value. | |
704 */ | |
705 int SharedRuntime::dtrace_object_alloc(oopDesc* o) { | |
706 return dtrace_object_alloc_base(Thread::current(), o); | |
707 } | |
708 | |
709 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) { | |
710 assert(DTraceAllocProbes, "wrong call"); | |
711 Klass* klass = o->blueprint(); | |
712 int size = o->size(); | |
713 symbolOop name = klass->name(); | |
714 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread), | |
715 name->bytes(), name->utf8_length(), size * HeapWordSize); | |
716 return 0; | |
717 } | |
718 | |
719 JRT_LEAF(int, SharedRuntime::dtrace_method_entry( | |
720 JavaThread* thread, methodOopDesc* method)) | |
721 assert(DTraceMethodProbes, "wrong call"); | |
722 symbolOop kname = method->klass_name(); | |
723 symbolOop name = method->name(); | |
724 symbolOop sig = method->signature(); | |
725 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread), | |
726 kname->bytes(), kname->utf8_length(), | |
727 name->bytes(), name->utf8_length(), | |
728 sig->bytes(), sig->utf8_length()); | |
729 return 0; | |
730 JRT_END | |
731 | |
732 JRT_LEAF(int, SharedRuntime::dtrace_method_exit( | |
733 JavaThread* thread, methodOopDesc* method)) | |
734 assert(DTraceMethodProbes, "wrong call"); | |
735 symbolOop kname = method->klass_name(); | |
736 symbolOop name = method->name(); | |
737 symbolOop sig = method->signature(); | |
738 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread), | |
739 kname->bytes(), kname->utf8_length(), | |
740 name->bytes(), name->utf8_length(), | |
741 sig->bytes(), sig->utf8_length()); | |
742 return 0; | |
743 JRT_END | |
744 | |
745 | |
746 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode) | |
747 // for a call current in progress, i.e., arguments has been pushed on stack | |
748 // put callee has not been invoked yet. Used by: resolve virtual/static, | |
749 // vtable updates, etc. Caller frame must be compiled. | |
750 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) { | |
751 ResourceMark rm(THREAD); | |
752 | |
753 // last java frame on stack (which includes native call frames) | |
754 vframeStream vfst(thread, true); // Do not skip and javaCalls | |
755 | |
756 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle())); | |
757 } | |
758 | |
759 | |
760 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode | |
761 // for a call current in progress, i.e., arguments has been pushed on stack | |
762 // but callee has not been invoked yet. Caller frame must be compiled. | |
763 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread, | |
764 vframeStream& vfst, | |
765 Bytecodes::Code& bc, | |
766 CallInfo& callinfo, TRAPS) { | |
767 Handle receiver; | |
768 Handle nullHandle; //create a handy null handle for exception returns | |
769 | |
770 assert(!vfst.at_end(), "Java frame must exist"); | |
771 | |
772 // Find caller and bci from vframe | |
773 methodHandle caller (THREAD, vfst.method()); | |
774 int bci = vfst.bci(); | |
775 | |
776 // Find bytecode | |
777 Bytecode_invoke* bytecode = Bytecode_invoke_at(caller, bci); | |
778 bc = bytecode->adjusted_invoke_code(); | |
779 int bytecode_index = bytecode->index(); | |
780 | |
781 // Find receiver for non-static call | |
782 if (bc != Bytecodes::_invokestatic) { | |
783 // This register map must be update since we need to find the receiver for | |
784 // compiled frames. The receiver might be in a register. | |
785 RegisterMap reg_map2(thread); | |
786 frame stubFrame = thread->last_frame(); | |
787 // Caller-frame is a compiled frame | |
788 frame callerFrame = stubFrame.sender(®_map2); | |
789 | |
790 methodHandle callee = bytecode->static_target(CHECK_(nullHandle)); | |
791 if (callee.is_null()) { | |
792 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle); | |
793 } | |
794 // Retrieve from a compiled argument list | |
795 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2)); | |
796 | |
797 if (receiver.is_null()) { | |
798 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle); | |
799 } | |
800 } | |
801 | |
802 // Resolve method. This is parameterized by bytecode. | |
803 constantPoolHandle constants (THREAD, caller->constants()); | |
804 assert (receiver.is_null() || receiver->is_oop(), "wrong receiver"); | |
805 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle)); | |
806 | |
807 #ifdef ASSERT | |
808 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls | |
809 if (bc != Bytecodes::_invokestatic) { | |
810 assert(receiver.not_null(), "should have thrown exception"); | |
811 KlassHandle receiver_klass (THREAD, receiver->klass()); | |
812 klassOop rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle)); | |
813 // klass is already loaded | |
814 KlassHandle static_receiver_klass (THREAD, rk); | |
815 assert(receiver_klass->is_subtype_of(static_receiver_klass()), "actual receiver must be subclass of static receiver klass"); | |
816 if (receiver_klass->oop_is_instance()) { | |
817 if (instanceKlass::cast(receiver_klass())->is_not_initialized()) { | |
818 tty->print_cr("ERROR: Klass not yet initialized!!"); | |
819 receiver_klass.print(); | |
820 } | |
821 assert (!instanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized"); | |
822 } | |
823 } | |
824 #endif | |
825 | |
826 return receiver; | |
827 } | |
828 | |
829 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) { | |
830 ResourceMark rm(THREAD); | |
831 // We need first to check if any Java activations (compiled, interpreted) | |
832 // exist on the stack since last JavaCall. If not, we need | |
833 // to get the target method from the JavaCall wrapper. | |
834 vframeStream vfst(thread, true); // Do not skip any javaCalls | |
835 methodHandle callee_method; | |
836 if (vfst.at_end()) { | |
837 // No Java frames were found on stack since we did the JavaCall. | |
838 // Hence the stack can only contain an entry_frame. We need to | |
839 // find the target method from the stub frame. | |
840 RegisterMap reg_map(thread, false); | |
841 frame fr = thread->last_frame(); | |
842 assert(fr.is_runtime_frame(), "must be a runtimeStub"); | |
843 fr = fr.sender(®_map); | |
844 assert(fr.is_entry_frame(), "must be"); | |
845 // fr is now pointing to the entry frame. | |
846 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method()); | |
847 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??"); | |
848 } else { | |
849 Bytecodes::Code bc; | |
850 CallInfo callinfo; | |
851 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle())); | |
852 callee_method = callinfo.selected_method(); | |
853 } | |
854 assert(callee_method()->is_method(), "must be"); | |
855 return callee_method; | |
856 } | |
857 | |
858 // Resolves a call. | |
859 methodHandle SharedRuntime::resolve_helper(JavaThread *thread, | |
860 bool is_virtual, | |
861 bool is_optimized, TRAPS) { | |
862 methodHandle callee_method; | |
863 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); | |
864 if (JvmtiExport::can_hotswap_or_post_breakpoint()) { | |
865 int retry_count = 0; | |
866 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() && | |
867 callee_method->method_holder() != SystemDictionary::object_klass()) { | |
868 // If has a pending exception then there is no need to re-try to | |
869 // resolve this method. | |
870 // If the method has been redefined, we need to try again. | |
871 // Hack: we have no way to update the vtables of arrays, so don't | |
872 // require that java.lang.Object has been updated. | |
873 | |
874 // It is very unlikely that method is redefined more than 100 times | |
875 // in the middle of resolve. If it is looping here more than 100 times | |
876 // means then there could be a bug here. | |
877 guarantee((retry_count++ < 100), | |
878 "Could not resolve to latest version of redefined method"); | |
879 // method is redefined in the middle of resolve so re-try. | |
880 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD); | |
881 } | |
882 } | |
883 return callee_method; | |
884 } | |
885 | |
886 // Resolves a call. The compilers generate code for calls that go here | |
887 // and are patched with the real destination of the call. | |
888 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread, | |
889 bool is_virtual, | |
890 bool is_optimized, TRAPS) { | |
891 | |
892 ResourceMark rm(thread); | |
893 RegisterMap cbl_map(thread, false); | |
894 frame caller_frame = thread->last_frame().sender(&cbl_map); | |
895 | |
896 CodeBlob* cb = caller_frame.cb(); | |
897 guarantee(cb != NULL && cb->is_nmethod(), "must be called from nmethod"); | |
898 // make sure caller is not getting deoptimized | |
899 // and removed before we are done with it. | |
900 // CLEANUP - with lazy deopt shouldn't need this lock | |
901 nmethodLocker caller_lock((nmethod*)cb); | |
902 | |
903 | |
904 // determine call info & receiver | |
905 // note: a) receiver is NULL for static calls | |
906 // b) an exception is thrown if receiver is NULL for non-static calls | |
907 CallInfo call_info; | |
908 Bytecodes::Code invoke_code = Bytecodes::_illegal; | |
909 Handle receiver = find_callee_info(thread, invoke_code, | |
910 call_info, CHECK_(methodHandle())); | |
911 methodHandle callee_method = call_info.selected_method(); | |
912 | |
913 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic) || | |
914 ( is_virtual && invoke_code != Bytecodes::_invokestatic), "inconsistent bytecode"); | |
915 | |
916 #ifndef PRODUCT | |
917 // tracing/debugging/statistics | |
918 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) : | |
919 (is_virtual) ? (&_resolve_virtual_ctr) : | |
920 (&_resolve_static_ctr); | |
921 Atomic::inc(addr); | |
922 | |
923 if (TraceCallFixup) { | |
924 ResourceMark rm(thread); | |
925 tty->print("resolving %s%s (%s) call to", | |
926 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static", | |
927 Bytecodes::name(invoke_code)); | |
928 callee_method->print_short_name(tty); | |
929 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); | |
930 } | |
931 #endif | |
932 | |
933 // Compute entry points. This might require generation of C2I converter | |
934 // frames, so we cannot be holding any locks here. Furthermore, the | |
935 // computation of the entry points is independent of patching the call. We | |
936 // always return the entry-point, but we only patch the stub if the call has | |
937 // not been deoptimized. Return values: For a virtual call this is an | |
938 // (cached_oop, destination address) pair. For a static call/optimized | |
939 // virtual this is just a destination address. | |
940 | |
941 StaticCallInfo static_call_info; | |
942 CompiledICInfo virtual_call_info; | |
943 | |
944 | |
945 // Make sure the callee nmethod does not get deoptimized and removed before | |
946 // we are done patching the code. | |
947 nmethod* nm = callee_method->code(); | |
948 nmethodLocker nl_callee(nm); | |
949 #ifdef ASSERT | |
950 address dest_entry_point = nm == NULL ? 0 : nm->entry_point(); // used below | |
951 #endif | |
952 | |
953 if (is_virtual) { | |
954 assert(receiver.not_null(), "sanity check"); | |
955 bool static_bound = call_info.resolved_method()->can_be_statically_bound(); | |
956 KlassHandle h_klass(THREAD, receiver->klass()); | |
957 CompiledIC::compute_monomorphic_entry(callee_method, h_klass, | |
958 is_optimized, static_bound, virtual_call_info, | |
959 CHECK_(methodHandle())); | |
960 } else { | |
961 // static call | |
962 CompiledStaticCall::compute_entry(callee_method, static_call_info); | |
963 } | |
964 | |
965 // grab lock, check for deoptimization and potentially patch caller | |
966 { | |
967 MutexLocker ml_patch(CompiledIC_lock); | |
968 | |
969 // Now that we are ready to patch if the methodOop was redefined then | |
970 // don't update call site and let the caller retry. | |
971 | |
972 if (!callee_method->is_old()) { | |
973 #ifdef ASSERT | |
974 // We must not try to patch to jump to an already unloaded method. | |
975 if (dest_entry_point != 0) { | |
976 assert(CodeCache::find_blob(dest_entry_point) != NULL, | |
977 "should not unload nmethod while locked"); | |
978 } | |
979 #endif | |
980 if (is_virtual) { | |
981 CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc()); | |
982 if (inline_cache->is_clean()) { | |
983 inline_cache->set_to_monomorphic(virtual_call_info); | |
984 } | |
985 } else { | |
986 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc()); | |
987 if (ssc->is_clean()) ssc->set(static_call_info); | |
988 } | |
989 } | |
990 | |
991 } // unlock CompiledIC_lock | |
992 | |
993 return callee_method; | |
994 } | |
995 | |
996 | |
997 // Inline caches exist only in compiled code | |
998 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread)) | |
999 #ifdef ASSERT | |
1000 RegisterMap reg_map(thread, false); | |
1001 frame stub_frame = thread->last_frame(); | |
1002 assert(stub_frame.is_runtime_frame(), "sanity check"); | |
1003 frame caller_frame = stub_frame.sender(®_map); | |
1004 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame"); | |
1005 #endif /* ASSERT */ | |
1006 | |
1007 methodHandle callee_method; | |
1008 JRT_BLOCK | |
1009 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL); | |
1010 // Return methodOop through TLS | |
1011 thread->set_vm_result(callee_method()); | |
1012 JRT_BLOCK_END | |
1013 // return compiled code entry point after potential safepoints | |
1014 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); | |
1015 return callee_method->verified_code_entry(); | |
1016 JRT_END | |
1017 | |
1018 | |
1019 // Handle call site that has been made non-entrant | |
1020 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread)) | |
1021 // 6243940 We might end up in here if the callee is deoptimized | |
1022 // as we race to call it. We don't want to take a safepoint if | |
1023 // the caller was interpreted because the caller frame will look | |
1024 // interpreted to the stack walkers and arguments are now | |
1025 // "compiled" so it is much better to make this transition | |
1026 // invisible to the stack walking code. The i2c path will | |
1027 // place the callee method in the callee_target. It is stashed | |
1028 // there because if we try and find the callee by normal means a | |
1029 // safepoint is possible and have trouble gc'ing the compiled args. | |
1030 RegisterMap reg_map(thread, false); | |
1031 frame stub_frame = thread->last_frame(); | |
1032 assert(stub_frame.is_runtime_frame(), "sanity check"); | |
1033 frame caller_frame = stub_frame.sender(®_map); | |
1034 if (caller_frame.is_interpreted_frame() || caller_frame.is_entry_frame() ) { | |
1035 methodOop callee = thread->callee_target(); | |
1036 guarantee(callee != NULL && callee->is_method(), "bad handshake"); | |
1037 thread->set_vm_result(callee); | |
1038 thread->set_callee_target(NULL); | |
1039 return callee->get_c2i_entry(); | |
1040 } | |
1041 | |
1042 // Must be compiled to compiled path which is safe to stackwalk | |
1043 methodHandle callee_method; | |
1044 JRT_BLOCK | |
1045 // Force resolving of caller (if we called from compiled frame) | |
1046 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL); | |
1047 thread->set_vm_result(callee_method()); | |
1048 JRT_BLOCK_END | |
1049 // return compiled code entry point after potential safepoints | |
1050 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); | |
1051 return callee_method->verified_code_entry(); | |
1052 JRT_END | |
1053 | |
1054 | |
1055 // resolve a static call and patch code | |
1056 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread )) | |
1057 methodHandle callee_method; | |
1058 JRT_BLOCK | |
1059 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL); | |
1060 thread->set_vm_result(callee_method()); | |
1061 JRT_BLOCK_END | |
1062 // return compiled code entry point after potential safepoints | |
1063 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); | |
1064 return callee_method->verified_code_entry(); | |
1065 JRT_END | |
1066 | |
1067 | |
1068 // resolve virtual call and update inline cache to monomorphic | |
1069 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread )) | |
1070 methodHandle callee_method; | |
1071 JRT_BLOCK | |
1072 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL); | |
1073 thread->set_vm_result(callee_method()); | |
1074 JRT_BLOCK_END | |
1075 // return compiled code entry point after potential safepoints | |
1076 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); | |
1077 return callee_method->verified_code_entry(); | |
1078 JRT_END | |
1079 | |
1080 | |
1081 // Resolve a virtual call that can be statically bound (e.g., always | |
1082 // monomorphic, so it has no inline cache). Patch code to resolved target. | |
1083 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread)) | |
1084 methodHandle callee_method; | |
1085 JRT_BLOCK | |
1086 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL); | |
1087 thread->set_vm_result(callee_method()); | |
1088 JRT_BLOCK_END | |
1089 // return compiled code entry point after potential safepoints | |
1090 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!"); | |
1091 return callee_method->verified_code_entry(); | |
1092 JRT_END | |
1093 | |
1094 | |
1095 | |
1096 | |
1097 | |
1098 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) { | |
1099 ResourceMark rm(thread); | |
1100 CallInfo call_info; | |
1101 Bytecodes::Code bc; | |
1102 | |
1103 // receiver is NULL for static calls. An exception is thrown for NULL | |
1104 // receivers for non-static calls | |
1105 Handle receiver = find_callee_info(thread, bc, call_info, | |
1106 CHECK_(methodHandle())); | |
1107 // Compiler1 can produce virtual call sites that can actually be statically bound | |
1108 // If we fell thru to below we would think that the site was going megamorphic | |
1109 // when in fact the site can never miss. Worse because we'd think it was megamorphic | |
1110 // we'd try and do a vtable dispatch however methods that can be statically bound | |
1111 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a | |
1112 // reresolution of the call site (as if we did a handle_wrong_method and not an | |
1113 // plain ic_miss) and the site will be converted to an optimized virtual call site | |
1114 // never to miss again. I don't believe C2 will produce code like this but if it | |
1115 // did this would still be the correct thing to do for it too, hence no ifdef. | |
1116 // | |
1117 if (call_info.resolved_method()->can_be_statically_bound()) { | |
1118 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle())); | |
1119 if (TraceCallFixup) { | |
1120 RegisterMap reg_map(thread, false); | |
1121 frame caller_frame = thread->last_frame().sender(®_map); | |
1122 ResourceMark rm(thread); | |
1123 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc)); | |
1124 callee_method->print_short_name(tty); | |
1125 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc()); | |
1126 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); | |
1127 } | |
1128 return callee_method; | |
1129 } | |
1130 | |
1131 methodHandle callee_method = call_info.selected_method(); | |
1132 | |
1133 bool should_be_mono = false; | |
1134 | |
1135 #ifndef PRODUCT | |
1136 Atomic::inc(&_ic_miss_ctr); | |
1137 | |
1138 // Statistics & Tracing | |
1139 if (TraceCallFixup) { | |
1140 ResourceMark rm(thread); | |
1141 tty->print("IC miss (%s) call to", Bytecodes::name(bc)); | |
1142 callee_method->print_short_name(tty); | |
1143 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); | |
1144 } | |
1145 | |
1146 if (ICMissHistogram) { | |
1147 MutexLocker m(VMStatistic_lock); | |
1148 RegisterMap reg_map(thread, false); | |
1149 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub | |
1150 // produce statistics under the lock | |
1151 trace_ic_miss(f.pc()); | |
1152 } | |
1153 #endif | |
1154 | |
1155 // install an event collector so that when a vtable stub is created the | |
1156 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The | |
1157 // event can't be posted when the stub is created as locks are held | |
1158 // - instead the event will be deferred until the event collector goes | |
1159 // out of scope. | |
1160 JvmtiDynamicCodeEventCollector event_collector; | |
1161 | |
1162 // Update inline cache to megamorphic. Skip update if caller has been | |
1163 // made non-entrant or we are called from interpreted. | |
1164 { MutexLocker ml_patch (CompiledIC_lock); | |
1165 RegisterMap reg_map(thread, false); | |
1166 frame caller_frame = thread->last_frame().sender(®_map); | |
1167 CodeBlob* cb = caller_frame.cb(); | |
1168 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) { | |
1169 // Not a non-entrant nmethod, so find inline_cache | |
1170 CompiledIC* inline_cache = CompiledIC_before(caller_frame.pc()); | |
1171 bool should_be_mono = false; | |
1172 if (inline_cache->is_optimized()) { | |
1173 if (TraceCallFixup) { | |
1174 ResourceMark rm(thread); | |
1175 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc)); | |
1176 callee_method->print_short_name(tty); | |
1177 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); | |
1178 } | |
1179 should_be_mono = true; | |
1180 } else { | |
1181 compiledICHolderOop ic_oop = (compiledICHolderOop) inline_cache->cached_oop(); | |
1182 if ( ic_oop != NULL && ic_oop->is_compiledICHolder()) { | |
1183 | |
1184 if (receiver()->klass() == ic_oop->holder_klass()) { | |
1185 // This isn't a real miss. We must have seen that compiled code | |
1186 // is now available and we want the call site converted to a | |
1187 // monomorphic compiled call site. | |
1188 // We can't assert for callee_method->code() != NULL because it | |
1189 // could have been deoptimized in the meantime | |
1190 if (TraceCallFixup) { | |
1191 ResourceMark rm(thread); | |
1192 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc)); | |
1193 callee_method->print_short_name(tty); | |
1194 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); | |
1195 } | |
1196 should_be_mono = true; | |
1197 } | |
1198 } | |
1199 } | |
1200 | |
1201 if (should_be_mono) { | |
1202 | |
1203 // We have a path that was monomorphic but was going interpreted | |
1204 // and now we have (or had) a compiled entry. We correct the IC | |
1205 // by using a new icBuffer. | |
1206 CompiledICInfo info; | |
1207 KlassHandle receiver_klass(THREAD, receiver()->klass()); | |
1208 inline_cache->compute_monomorphic_entry(callee_method, | |
1209 receiver_klass, | |
1210 inline_cache->is_optimized(), | |
1211 false, | |
1212 info, CHECK_(methodHandle())); | |
1213 inline_cache->set_to_monomorphic(info); | |
1214 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) { | |
1215 // Change to megamorphic | |
1216 inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle())); | |
1217 } else { | |
1218 // Either clean or megamorphic | |
1219 } | |
1220 } | |
1221 } // Release CompiledIC_lock | |
1222 | |
1223 return callee_method; | |
1224 } | |
1225 | |
1226 // | |
1227 // Resets a call-site in compiled code so it will get resolved again. | |
1228 // This routines handles both virtual call sites, optimized virtual call | |
1229 // sites, and static call sites. Typically used to change a call sites | |
1230 // destination from compiled to interpreted. | |
1231 // | |
1232 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) { | |
1233 ResourceMark rm(thread); | |
1234 RegisterMap reg_map(thread, false); | |
1235 frame stub_frame = thread->last_frame(); | |
1236 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub"); | |
1237 frame caller = stub_frame.sender(®_map); | |
1238 | |
1239 // Do nothing if the frame isn't a live compiled frame. | |
1240 // nmethod could be deoptimized by the time we get here | |
1241 // so no update to the caller is needed. | |
1242 | |
1243 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) { | |
1244 | |
1245 address pc = caller.pc(); | |
1246 Events::log("update call-site at pc " INTPTR_FORMAT, pc); | |
1247 | |
1248 // Default call_addr is the location of the "basic" call. | |
1249 // Determine the address of the call we a reresolving. With | |
1250 // Inline Caches we will always find a recognizable call. | |
1251 // With Inline Caches disabled we may or may not find a | |
1252 // recognizable call. We will always find a call for static | |
1253 // calls and for optimized virtual calls. For vanilla virtual | |
1254 // calls it depends on the state of the UseInlineCaches switch. | |
1255 // | |
1256 // With Inline Caches disabled we can get here for a virtual call | |
1257 // for two reasons: | |
1258 // 1 - calling an abstract method. The vtable for abstract methods | |
1259 // will run us thru handle_wrong_method and we will eventually | |
1260 // end up in the interpreter to throw the ame. | |
1261 // 2 - a racing deoptimization. We could be doing a vanilla vtable | |
1262 // call and between the time we fetch the entry address and | |
1263 // we jump to it the target gets deoptimized. Similar to 1 | |
1264 // we will wind up in the interprter (thru a c2i with c2). | |
1265 // | |
1266 address call_addr = NULL; | |
1267 { | |
1268 // Get call instruction under lock because another thread may be | |
1269 // busy patching it. | |
1270 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); | |
1271 // Location of call instruction | |
1272 if (NativeCall::is_call_before(pc)) { | |
1273 NativeCall *ncall = nativeCall_before(pc); | |
1274 call_addr = ncall->instruction_address(); | |
1275 } | |
1276 } | |
1277 | |
1278 // Check for static or virtual call | |
1279 bool is_static_call = false; | |
1280 nmethod* caller_nm = CodeCache::find_nmethod(pc); | |
1281 // Make sure nmethod doesn't get deoptimized and removed until | |
1282 // this is done with it. | |
1283 // CLEANUP - with lazy deopt shouldn't need this lock | |
1284 nmethodLocker nmlock(caller_nm); | |
1285 | |
1286 if (call_addr != NULL) { | |
1287 RelocIterator iter(caller_nm, call_addr, call_addr+1); | |
1288 int ret = iter.next(); // Get item | |
1289 if (ret) { | |
1290 assert(iter.addr() == call_addr, "must find call"); | |
1291 if (iter.type() == relocInfo::static_call_type) { | |
1292 is_static_call = true; | |
1293 } else { | |
1294 assert(iter.type() == relocInfo::virtual_call_type || | |
1295 iter.type() == relocInfo::opt_virtual_call_type | |
1296 , "unexpected relocInfo. type"); | |
1297 } | |
1298 } else { | |
1299 assert(!UseInlineCaches, "relocation info. must exist for this address"); | |
1300 } | |
1301 | |
1302 // Cleaning the inline cache will force a new resolve. This is more robust | |
1303 // than directly setting it to the new destination, since resolving of calls | |
1304 // is always done through the same code path. (experience shows that it | |
1305 // leads to very hard to track down bugs, if an inline cache gets updated | |
1306 // to a wrong method). It should not be performance critical, since the | |
1307 // resolve is only done once. | |
1308 | |
1309 MutexLocker ml(CompiledIC_lock); | |
1310 // | |
1311 // We do not patch the call site if the nmethod has been made non-entrant | |
1312 // as it is a waste of time | |
1313 // | |
1314 if (caller_nm->is_in_use()) { | |
1315 if (is_static_call) { | |
1316 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr); | |
1317 ssc->set_to_clean(); | |
1318 } else { | |
1319 // compiled, dispatched call (which used to call an interpreted method) | |
1320 CompiledIC* inline_cache = CompiledIC_at(call_addr); | |
1321 inline_cache->set_to_clean(); | |
1322 } | |
1323 } | |
1324 } | |
1325 | |
1326 } | |
1327 | |
1328 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle())); | |
1329 | |
1330 | |
1331 #ifndef PRODUCT | |
1332 Atomic::inc(&_wrong_method_ctr); | |
1333 | |
1334 if (TraceCallFixup) { | |
1335 ResourceMark rm(thread); | |
1336 tty->print("handle_wrong_method reresolving call to"); | |
1337 callee_method->print_short_name(tty); | |
1338 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code()); | |
1339 } | |
1340 #endif | |
1341 | |
1342 return callee_method; | |
1343 } | |
1344 | |
1345 // --------------------------------------------------------------------------- | |
1346 // We are calling the interpreter via a c2i. Normally this would mean that | |
1347 // we were called by a compiled method. However we could have lost a race | |
1348 // where we went int -> i2c -> c2i and so the caller could in fact be | |
1349 // interpreted. If the caller is compiled we attampt to patch the caller | |
1350 // so he no longer calls into the interpreter. | |
1351 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(methodOopDesc* method, address caller_pc)) | |
1352 methodOop moop(method); | |
1353 | |
1354 address entry_point = moop->from_compiled_entry(); | |
1355 | |
1356 // It's possible that deoptimization can occur at a call site which hasn't | |
1357 // been resolved yet, in which case this function will be called from | |
1358 // an nmethod that has been patched for deopt and we can ignore the | |
1359 // request for a fixup. | |
1360 // Also it is possible that we lost a race in that from_compiled_entry | |
1361 // is now back to the i2c in that case we don't need to patch and if | |
1362 // we did we'd leap into space because the callsite needs to use | |
1363 // "to interpreter" stub in order to load up the methodOop. Don't | |
1364 // ask me how I know this... | |
1365 // | |
1366 | |
1367 CodeBlob* cb = CodeCache::find_blob(caller_pc); | |
1368 if ( !cb->is_nmethod() || entry_point == moop->get_c2i_entry()) { | |
1369 return; | |
1370 } | |
1371 | |
1372 // There is a benign race here. We could be attempting to patch to a compiled | |
1373 // entry point at the same time the callee is being deoptimized. If that is | |
1374 // the case then entry_point may in fact point to a c2i and we'd patch the | |
1375 // call site with the same old data. clear_code will set code() to NULL | |
1376 // at the end of it. If we happen to see that NULL then we can skip trying | |
1377 // to patch. If we hit the window where the callee has a c2i in the | |
1378 // from_compiled_entry and the NULL isn't present yet then we lose the race | |
1379 // and patch the code with the same old data. Asi es la vida. | |
1380 | |
1381 if (moop->code() == NULL) return; | |
1382 | |
1383 if (((nmethod*)cb)->is_in_use()) { | |
1384 | |
1385 // Expect to find a native call there (unless it was no-inline cache vtable dispatch) | |
1386 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag); | |
1387 if (NativeCall::is_call_before(caller_pc + frame::pc_return_offset)) { | |
1388 NativeCall *call = nativeCall_before(caller_pc + frame::pc_return_offset); | |
1389 // | |
1390 // bug 6281185. We might get here after resolving a call site to a vanilla | |
1391 // virtual call. Because the resolvee uses the verified entry it may then | |
1392 // see compiled code and attempt to patch the site by calling us. This would | |
1393 // then incorrectly convert the call site to optimized and its downhill from | |
1394 // there. If you're lucky you'll get the assert in the bugid, if not you've | |
1395 // just made a call site that could be megamorphic into a monomorphic site | |
1396 // for the rest of its life! Just another racing bug in the life of | |
1397 // fixup_callers_callsite ... | |
1398 // | |
1399 RelocIterator iter(cb, call->instruction_address(), call->next_instruction_address()); | |
1400 iter.next(); | |
1401 assert(iter.has_current(), "must have a reloc at java call site"); | |
1402 relocInfo::relocType typ = iter.reloc()->type(); | |
1403 if ( typ != relocInfo::static_call_type && | |
1404 typ != relocInfo::opt_virtual_call_type && | |
1405 typ != relocInfo::static_stub_type) { | |
1406 return; | |
1407 } | |
1408 address destination = call->destination(); | |
1409 if (destination != entry_point) { | |
1410 CodeBlob* callee = CodeCache::find_blob(destination); | |
1411 // callee == cb seems weird. It means calling interpreter thru stub. | |
1412 if (callee == cb || callee->is_adapter_blob()) { | |
1413 // static call or optimized virtual | |
1414 if (TraceCallFixup) { | |
1415 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); | |
1416 moop->print_short_name(tty); | |
1417 tty->print_cr(" to " INTPTR_FORMAT, entry_point); | |
1418 } | |
1419 call->set_destination_mt_safe(entry_point); | |
1420 } else { | |
1421 if (TraceCallFixup) { | |
1422 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); | |
1423 moop->print_short_name(tty); | |
1424 tty->print_cr(" to " INTPTR_FORMAT, entry_point); | |
1425 } | |
1426 // assert is too strong could also be resolve destinations. | |
1427 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be"); | |
1428 } | |
1429 } else { | |
1430 if (TraceCallFixup) { | |
1431 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc); | |
1432 moop->print_short_name(tty); | |
1433 tty->print_cr(" to " INTPTR_FORMAT, entry_point); | |
1434 } | |
1435 } | |
1436 } | |
1437 } | |
1438 | |
1439 IRT_END | |
1440 | |
1441 | |
1442 // same as JVM_Arraycopy, but called directly from compiled code | |
1443 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos, | |
1444 oopDesc* dest, jint dest_pos, | |
1445 jint length, | |
1446 JavaThread* thread)) { | |
1447 #ifndef PRODUCT | |
1448 _slow_array_copy_ctr++; | |
1449 #endif | |
1450 // Check if we have null pointers | |
1451 if (src == NULL || dest == NULL) { | |
1452 THROW(vmSymbols::java_lang_NullPointerException()); | |
1453 } | |
1454 // Do the copy. The casts to arrayOop are necessary to the copy_array API, | |
1455 // even though the copy_array API also performs dynamic checks to ensure | |
1456 // that src and dest are truly arrays (and are conformable). | |
1457 // The copy_array mechanism is awkward and could be removed, but | |
1458 // the compilers don't call this function except as a last resort, | |
1459 // so it probably doesn't matter. | |
1460 Klass::cast(src->klass())->copy_array((arrayOopDesc*)src, src_pos, | |
1461 (arrayOopDesc*)dest, dest_pos, | |
1462 length, thread); | |
1463 } | |
1464 JRT_END | |
1465 | |
1466 char* SharedRuntime::generate_class_cast_message( | |
1467 JavaThread* thread, const char* objName) { | |
1468 | |
1469 // Get target class name from the checkcast instruction | |
1470 vframeStream vfst(thread, true); | |
1471 assert(!vfst.at_end(), "Java frame must exist"); | |
1472 Bytecode_checkcast* cc = Bytecode_checkcast_at( | |
1473 vfst.method()->bcp_from(vfst.bci())); | |
1474 Klass* targetKlass = Klass::cast(vfst.method()->constants()->klass_at( | |
1475 cc->index(), thread)); | |
1476 return generate_class_cast_message(objName, targetKlass->external_name()); | |
1477 } | |
1478 | |
1479 char* SharedRuntime::generate_class_cast_message( | |
1480 const char* objName, const char* targetKlassName) { | |
1481 const char* desc = " cannot be cast to "; | |
1482 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1; | |
1483 | |
1484 char* message = NEW_C_HEAP_ARRAY(char, msglen); | |
1485 if (NULL == message) { | |
1486 // out of memory - can't use a detailed message. Since caller is | |
1487 // using a resource mark to free memory, returning this should be | |
1488 // safe (caller won't explicitly delete it). | |
1489 message = const_cast<char*>(objName); | |
1490 } else { | |
1491 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName); | |
1492 } | |
1493 return message; | |
1494 } | |
1495 | |
1496 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages()) | |
1497 (void) JavaThread::current()->reguard_stack(); | |
1498 JRT_END | |
1499 | |
1500 | |
1501 // Handles the uncommon case in locking, i.e., contention or an inflated lock. | |
1502 #ifndef PRODUCT | |
1503 int SharedRuntime::_monitor_enter_ctr=0; | |
1504 #endif | |
1505 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread)) | |
1506 oop obj(_obj); | |
1507 #ifndef PRODUCT | |
1508 _monitor_enter_ctr++; // monitor enter slow | |
1509 #endif | |
1510 if (PrintBiasedLockingStatistics) { | |
1511 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); | |
1512 } | |
1513 Handle h_obj(THREAD, obj); | |
1514 if (UseBiasedLocking) { | |
1515 // Retry fast entry if bias is revoked to avoid unnecessary inflation | |
1516 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK); | |
1517 } else { | |
1518 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK); | |
1519 } | |
1520 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here"); | |
1521 JRT_END | |
1522 | |
1523 #ifndef PRODUCT | |
1524 int SharedRuntime::_monitor_exit_ctr=0; | |
1525 #endif | |
1526 // Handles the uncommon cases of monitor unlocking in compiled code | |
1527 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock)) | |
1528 oop obj(_obj); | |
1529 #ifndef PRODUCT | |
1530 _monitor_exit_ctr++; // monitor exit slow | |
1531 #endif | |
1532 Thread* THREAD = JavaThread::current(); | |
1533 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore | |
1534 // testing was unable to ever fire the assert that guarded it so I have removed it. | |
1535 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?"); | |
1536 #undef MIGHT_HAVE_PENDING | |
1537 #ifdef MIGHT_HAVE_PENDING | |
1538 // Save and restore any pending_exception around the exception mark. | |
1539 // While the slow_exit must not throw an exception, we could come into | |
1540 // this routine with one set. | |
1541 oop pending_excep = NULL; | |
1542 const char* pending_file; | |
1543 int pending_line; | |
1544 if (HAS_PENDING_EXCEPTION) { | |
1545 pending_excep = PENDING_EXCEPTION; | |
1546 pending_file = THREAD->exception_file(); | |
1547 pending_line = THREAD->exception_line(); | |
1548 CLEAR_PENDING_EXCEPTION; | |
1549 } | |
1550 #endif /* MIGHT_HAVE_PENDING */ | |
1551 | |
1552 { | |
1553 // Exit must be non-blocking, and therefore no exceptions can be thrown. | |
1554 EXCEPTION_MARK; | |
1555 ObjectSynchronizer::slow_exit(obj, lock, THREAD); | |
1556 } | |
1557 | |
1558 #ifdef MIGHT_HAVE_PENDING | |
1559 if (pending_excep != NULL) { | |
1560 THREAD->set_pending_exception(pending_excep, pending_file, pending_line); | |
1561 } | |
1562 #endif /* MIGHT_HAVE_PENDING */ | |
1563 JRT_END | |
1564 | |
1565 #ifndef PRODUCT | |
1566 | |
1567 void SharedRuntime::print_statistics() { | |
1568 ttyLocker ttyl; | |
1569 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'"); | |
1570 | |
1571 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr); | |
1572 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr); | |
1573 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr); | |
1574 | |
1575 SharedRuntime::print_ic_miss_histogram(); | |
1576 | |
1577 if (CountRemovableExceptions) { | |
1578 if (_nof_removable_exceptions > 0) { | |
1579 Unimplemented(); // this counter is not yet incremented | |
1580 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions); | |
1581 } | |
1582 } | |
1583 | |
1584 // Dump the JRT_ENTRY counters | |
1585 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr); | |
1586 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr); | |
1587 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr); | |
1588 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr); | |
1589 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr); | |
1590 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr); | |
1591 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr); | |
1592 | |
1593 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr ); | |
1594 tty->print_cr("%5d wrong method", _wrong_method_ctr ); | |
1595 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr ); | |
1596 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr ); | |
1597 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr ); | |
1598 | |
1599 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr ); | |
1600 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr ); | |
1601 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr ); | |
1602 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr ); | |
1603 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr ); | |
1604 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr ); | |
1605 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr ); | |
1606 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr ); | |
1607 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr ); | |
1608 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr ); | |
1609 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr ); | |
1610 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr ); | |
1611 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr ); | |
1612 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr ); | |
1613 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr ); | |
1614 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr ); | |
1615 | |
1616 if (xtty != NULL) xtty->tail("statistics"); | |
1617 } | |
1618 | |
1619 inline double percent(int x, int y) { | |
1620 return 100.0 * x / MAX2(y, 1); | |
1621 } | |
1622 | |
1623 class MethodArityHistogram { | |
1624 public: | |
1625 enum { MAX_ARITY = 256 }; | |
1626 private: | |
1627 static int _arity_histogram[MAX_ARITY]; // histogram of #args | |
1628 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words | |
1629 static int _max_arity; // max. arity seen | |
1630 static int _max_size; // max. arg size seen | |
1631 | |
1632 static void add_method_to_histogram(nmethod* nm) { | |
1633 methodOop m = nm->method(); | |
1634 ArgumentCount args(m->signature()); | |
1635 int arity = args.size() + (m->is_static() ? 0 : 1); | |
1636 int argsize = m->size_of_parameters(); | |
1637 arity = MIN2(arity, MAX_ARITY-1); | |
1638 argsize = MIN2(argsize, MAX_ARITY-1); | |
1639 int count = nm->method()->compiled_invocation_count(); | |
1640 _arity_histogram[arity] += count; | |
1641 _size_histogram[argsize] += count; | |
1642 _max_arity = MAX2(_max_arity, arity); | |
1643 _max_size = MAX2(_max_size, argsize); | |
1644 } | |
1645 | |
1646 void print_histogram_helper(int n, int* histo, const char* name) { | |
1647 const int N = MIN2(5, n); | |
1648 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); | |
1649 double sum = 0; | |
1650 double weighted_sum = 0; | |
1651 int i; | |
1652 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; } | |
1653 double rest = sum; | |
1654 double percent = sum / 100; | |
1655 for (i = 0; i <= N; i++) { | |
1656 rest -= histo[i]; | |
1657 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent); | |
1658 } | |
1659 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent); | |
1660 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n); | |
1661 } | |
1662 | |
1663 void print_histogram() { | |
1664 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):"); | |
1665 print_histogram_helper(_max_arity, _arity_histogram, "arity"); | |
1666 tty->print_cr("\nSame for parameter size (in words):"); | |
1667 print_histogram_helper(_max_size, _size_histogram, "size"); | |
1668 tty->cr(); | |
1669 } | |
1670 | |
1671 public: | |
1672 MethodArityHistogram() { | |
1673 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
1674 _max_arity = _max_size = 0; | |
1675 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0; | |
1676 CodeCache::nmethods_do(add_method_to_histogram); | |
1677 print_histogram(); | |
1678 } | |
1679 }; | |
1680 | |
1681 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY]; | |
1682 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY]; | |
1683 int MethodArityHistogram::_max_arity; | |
1684 int MethodArityHistogram::_max_size; | |
1685 | |
1686 void SharedRuntime::print_call_statistics(int comp_total) { | |
1687 tty->print_cr("Calls from compiled code:"); | |
1688 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls; | |
1689 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls; | |
1690 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls; | |
1691 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total)); | |
1692 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total)); | |
1693 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls)); | |
1694 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls)); | |
1695 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls)); | |
1696 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls)); | |
1697 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total)); | |
1698 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls)); | |
1699 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls)); | |
1700 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls)); | |
1701 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls)); | |
1702 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total)); | |
1703 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls)); | |
1704 tty->cr(); | |
1705 tty->print_cr("Note 1: counter updates are not MT-safe."); | |
1706 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;"); | |
1707 tty->print_cr(" %% in nested categories are relative to their category"); | |
1708 tty->print_cr(" (and thus add up to more than 100%% with inlining)"); | |
1709 tty->cr(); | |
1710 | |
1711 MethodArityHistogram h; | |
1712 } | |
1713 #endif | |
1714 | |
1715 | |
1716 // --------------------------------------------------------------------------- | |
1717 // Implementation of AdapterHandlerLibrary | |
1718 const char* AdapterHandlerEntry::name = "I2C/C2I adapters"; | |
1719 GrowableArray<uint64_t>* AdapterHandlerLibrary::_fingerprints = NULL; | |
1720 GrowableArray<AdapterHandlerEntry* >* AdapterHandlerLibrary::_handlers = NULL; | |
1721 const int AdapterHandlerLibrary_size = 16*K; | |
1722 u_char AdapterHandlerLibrary::_buffer[AdapterHandlerLibrary_size + 32]; | |
1723 | |
1724 void AdapterHandlerLibrary::initialize() { | |
1725 if (_fingerprints != NULL) return; | |
1726 _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true); | |
1727 _handlers = new(ResourceObj::C_HEAP)GrowableArray<AdapterHandlerEntry*>(32, true); | |
1728 // Index 0 reserved for the slow path handler | |
1729 _fingerprints->append(0/*the never-allowed 0 fingerprint*/); | |
1730 _handlers->append(NULL); | |
1731 | |
1732 // Create a special handler for abstract methods. Abstract methods | |
1733 // are never compiled so an i2c entry is somewhat meaningless, but | |
1734 // fill it in with something appropriate just in case. Pass handle | |
1735 // wrong method for the c2i transitions. | |
1736 address wrong_method = SharedRuntime::get_handle_wrong_method_stub(); | |
1737 _fingerprints->append(0/*the never-allowed 0 fingerprint*/); | |
1738 assert(_handlers->length() == AbstractMethodHandler, "in wrong slot"); | |
1739 _handlers->append(new AdapterHandlerEntry(StubRoutines::throw_AbstractMethodError_entry(), | |
1740 wrong_method, wrong_method)); | |
1741 } | |
1742 | |
1743 int AdapterHandlerLibrary::get_create_adapter_index(methodHandle method) { | |
1744 // Use customized signature handler. Need to lock around updates to the | |
1745 // _fingerprints array (it is not safe for concurrent readers and a single | |
1746 // writer: this can be fixed if it becomes a problem). | |
1747 | |
1748 // Shouldn't be here if running -Xint | |
1749 if (Arguments::mode() == Arguments::_int) { | |
1750 ShouldNotReachHere(); | |
1751 } | |
1752 | |
1753 // Get the address of the ic_miss handlers before we grab the | |
1754 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which | |
1755 // was caused by the initialization of the stubs happening | |
1756 // while we held the lock and then notifying jvmti while | |
1757 // holding it. This just forces the initialization to be a little | |
1758 // earlier. | |
1759 address ic_miss = SharedRuntime::get_ic_miss_stub(); | |
1760 assert(ic_miss != NULL, "must have handler"); | |
1761 | |
1762 int result; | |
1763 BufferBlob *B = NULL; | |
1764 uint64_t fingerprint; | |
1765 { | |
1766 MutexLocker mu(AdapterHandlerLibrary_lock); | |
1767 // make sure data structure is initialized | |
1768 initialize(); | |
1769 | |
1770 if (method->is_abstract()) { | |
1771 return AbstractMethodHandler; | |
1772 } | |
1773 | |
1774 // Lookup method signature's fingerprint | |
1775 fingerprint = Fingerprinter(method).fingerprint(); | |
1776 assert( fingerprint != CONST64( 0), "no zero fingerprints allowed" ); | |
1777 // Fingerprints are small fixed-size condensed representations of | |
1778 // signatures. If the signature is too large, it won't fit in a | |
1779 // fingerprint. Signatures which cannot support a fingerprint get a new i2c | |
1780 // adapter gen'd each time, instead of searching the cache for one. This -1 | |
1781 // game can be avoided if I compared signatures instead of using | |
1782 // fingerprints. However, -1 fingerprints are very rare. | |
1783 if( fingerprint != UCONST64(-1) ) { // If this is a cache-able fingerprint | |
1784 // Turns out i2c adapters do not care what the return value is. Mask it | |
1785 // out so signatures that only differ in return type will share the same | |
1786 // adapter. | |
1787 fingerprint &= ~(SignatureIterator::result_feature_mask << SignatureIterator::static_feature_size); | |
1788 // Search for a prior existing i2c/c2i adapter | |
1789 int index = _fingerprints->find(fingerprint); | |
1790 if( index >= 0 ) return index; // Found existing handlers? | |
1791 } else { | |
1792 // Annoyingly, I end up adding -1 fingerprints to the array of handlers, | |
1793 // because I need a unique handler index. It cannot be scanned for | |
1794 // because all -1's look alike. Instead, the matching index is passed out | |
1795 // and immediately used to collect the 2 return values (the c2i and i2c | |
1796 // adapters). | |
1797 } | |
1798 | |
1799 // Create I2C & C2I handlers | |
1800 ResourceMark rm; | |
1801 // Improve alignment slightly | |
1802 u_char *buf = (u_char*)(((intptr_t)_buffer + CodeEntryAlignment-1) & ~(CodeEntryAlignment-1)); | |
1803 CodeBuffer buffer(buf, AdapterHandlerLibrary_size); | |
1804 short buffer_locs[20]; | |
1805 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs, | |
1806 sizeof(buffer_locs)/sizeof(relocInfo)); | |
1807 MacroAssembler _masm(&buffer); | |
1808 | |
1809 // Fill in the signature array, for the calling-convention call. | |
1810 int total_args_passed = method->size_of_parameters(); // All args on stack | |
1811 | |
1812 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed); | |
1813 VMRegPair * regs = NEW_RESOURCE_ARRAY(VMRegPair ,total_args_passed); | |
1814 int i=0; | |
1815 if( !method->is_static() ) // Pass in receiver first | |
1816 sig_bt[i++] = T_OBJECT; | |
1817 for( SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) { | |
1818 sig_bt[i++] = ss.type(); // Collect remaining bits of signature | |
1819 if( ss.type() == T_LONG || ss.type() == T_DOUBLE ) | |
1820 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots | |
1821 } | |
1822 assert( i==total_args_passed, "" ); | |
1823 | |
1824 // Now get the re-packed compiled-Java layout. | |
1825 int comp_args_on_stack; | |
1826 | |
1827 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage | |
1828 comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); | |
1829 | |
1830 AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm, | |
1831 total_args_passed, | |
1832 comp_args_on_stack, | |
1833 sig_bt, | |
1834 regs); | |
1835 | |
1836 B = BufferBlob::create(AdapterHandlerEntry::name, &buffer); | |
1837 if (B == NULL) return -2; // Out of CodeCache space | |
1838 entry->relocate(B->instructions_begin()); | |
1839 #ifndef PRODUCT | |
1840 // debugging suppport | |
1841 if (PrintAdapterHandlers) { | |
1842 tty->cr(); | |
1843 tty->print_cr("i2c argument handler #%d for: %s %s (fingerprint = 0x%llx, %d bytes generated)", | |
1844 _handlers->length(), (method->is_static() ? "static" : "receiver"), | |
1845 method->signature()->as_C_string(), fingerprint, buffer.code_size() ); | |
1846 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry()); | |
1847 Disassembler::decode(entry->get_i2c_entry(), entry->get_i2c_entry() + buffer.code_size()); | |
1848 } | |
1849 #endif | |
1850 | |
1851 // add handlers to library | |
1852 _fingerprints->append(fingerprint); | |
1853 _handlers->append(entry); | |
1854 // set handler index | |
1855 assert(_fingerprints->length() == _handlers->length(), "sanity check"); | |
1856 result = _fingerprints->length() - 1; | |
1857 } | |
1858 // Outside of the lock | |
1859 if (B != NULL) { | |
1860 char blob_id[256]; | |
1861 jio_snprintf(blob_id, | |
1862 sizeof(blob_id), | |
1863 "%s(" PTR64_FORMAT ")@" PTR_FORMAT, | |
1864 AdapterHandlerEntry::name, | |
1865 fingerprint, | |
1866 B->instructions_begin()); | |
1867 VTune::register_stub(blob_id, B->instructions_begin(), B->instructions_end()); | |
1868 Forte::register_stub(blob_id, B->instructions_begin(), B->instructions_end()); | |
1869 | |
1870 if (JvmtiExport::should_post_dynamic_code_generated()) { | |
1871 JvmtiExport::post_dynamic_code_generated(blob_id, | |
1872 B->instructions_begin(), | |
1873 B->instructions_end()); | |
1874 } | |
1875 } | |
1876 return result; | |
1877 } | |
1878 | |
1879 void AdapterHandlerEntry::relocate(address new_base) { | |
1880 ptrdiff_t delta = new_base - _i2c_entry; | |
1881 _i2c_entry += delta; | |
1882 _c2i_entry += delta; | |
1883 _c2i_unverified_entry += delta; | |
1884 } | |
1885 | |
1886 // Create a native wrapper for this native method. The wrapper converts the | |
1887 // java compiled calling convention to the native convention, handlizes | |
1888 // arguments, and transitions to native. On return from the native we transition | |
1889 // back to java blocking if a safepoint is in progress. | |
1890 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method) { | |
1891 ResourceMark rm; | |
1892 nmethod* nm = NULL; | |
1893 | |
1894 if (PrintCompilation) { | |
1895 ttyLocker ttyl; | |
1896 tty->print("--- n%s ", (method->is_synchronized() ? "s" : " ")); | |
1897 method->print_short_name(tty); | |
1898 if (method->is_static()) { | |
1899 tty->print(" (static)"); | |
1900 } | |
1901 tty->cr(); | |
1902 } | |
1903 | |
1904 assert(method->has_native_function(), "must have something valid to call!"); | |
1905 | |
1906 { | |
1907 // perform the work while holding the lock, but perform any printing outside the lock | |
1908 MutexLocker mu(AdapterHandlerLibrary_lock); | |
1909 // See if somebody beat us to it | |
1910 nm = method->code(); | |
1911 if (nm) { | |
1912 return nm; | |
1913 } | |
1914 | |
1915 // Improve alignment slightly | |
1916 u_char* buf = (u_char*)(((intptr_t)_buffer + CodeEntryAlignment-1) & ~(CodeEntryAlignment-1)); | |
1917 CodeBuffer buffer(buf, AdapterHandlerLibrary_size); | |
1918 // Need a few relocation entries | |
1919 double locs_buf[20]; | |
1920 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo)); | |
1921 MacroAssembler _masm(&buffer); | |
1922 | |
1923 // Fill in the signature array, for the calling-convention call. | |
1924 int total_args_passed = method->size_of_parameters(); | |
1925 | |
1926 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType,total_args_passed); | |
1927 VMRegPair * regs = NEW_RESOURCE_ARRAY(VMRegPair ,total_args_passed); | |
1928 int i=0; | |
1929 if( !method->is_static() ) // Pass in receiver first | |
1930 sig_bt[i++] = T_OBJECT; | |
1931 SignatureStream ss(method->signature()); | |
1932 for( ; !ss.at_return_type(); ss.next()) { | |
1933 sig_bt[i++] = ss.type(); // Collect remaining bits of signature | |
1934 if( ss.type() == T_LONG || ss.type() == T_DOUBLE ) | |
1935 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots | |
1936 } | |
1937 assert( i==total_args_passed, "" ); | |
1938 BasicType ret_type = ss.type(); | |
1939 | |
1940 // Now get the compiled-Java layout as input arguments | |
1941 int comp_args_on_stack; | |
1942 comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); | |
1943 | |
1944 // Generate the compiled-to-native wrapper code | |
1945 nm = SharedRuntime::generate_native_wrapper(&_masm, | |
1946 method, | |
1947 total_args_passed, | |
1948 comp_args_on_stack, | |
1949 sig_bt,regs, | |
1950 ret_type); | |
1951 } | |
1952 | |
1953 // Must unlock before calling set_code | |
1954 // Install the generated code. | |
1955 if (nm != NULL) { | |
1956 method->set_code(method, nm); | |
1957 nm->post_compiled_method_load_event(); | |
1958 } else { | |
1959 // CodeCache is full, disable compilation | |
1960 // Ought to log this but compile log is only per compile thread | |
1961 // and we're some non descript Java thread. | |
1962 UseInterpreter = true; | |
1963 if (UseCompiler || AlwaysCompileLoopMethods ) { | |
1964 #ifndef PRODUCT | |
1965 warning("CodeCache is full. Compiler has been disabled"); | |
1966 if (CompileTheWorld || ExitOnFullCodeCache) { | |
1967 before_exit(JavaThread::current()); | |
1968 exit_globals(); // will delete tty | |
1969 vm_direct_exit(CompileTheWorld ? 0 : 1); | |
1970 } | |
1971 #endif | |
1972 UseCompiler = false; | |
1973 AlwaysCompileLoopMethods = false; | |
1974 } | |
1975 } | |
1976 return nm; | |
1977 } | |
1978 | |
1979 // ------------------------------------------------------------------------- | |
1980 // Java-Java calling convention | |
1981 // (what you use when Java calls Java) | |
1982 | |
1983 //------------------------------name_for_receiver---------------------------------- | |
1984 // For a given signature, return the VMReg for parameter 0. | |
1985 VMReg SharedRuntime::name_for_receiver() { | |
1986 VMRegPair regs; | |
1987 BasicType sig_bt = T_OBJECT; | |
1988 (void) java_calling_convention(&sig_bt, ®s, 1, true); | |
1989 // Return argument 0 register. In the LP64 build pointers | |
1990 // take 2 registers, but the VM wants only the 'main' name. | |
1991 return regs.first(); | |
1992 } | |
1993 | |
1994 VMRegPair *SharedRuntime::find_callee_arguments(symbolOop sig, bool is_static, int* arg_size) { | |
1995 // This method is returning a data structure allocating as a | |
1996 // ResourceObject, so do not put any ResourceMarks in here. | |
1997 char *s = sig->as_C_string(); | |
1998 int len = (int)strlen(s); | |
1999 *s++; len--; // Skip opening paren | |
2000 char *t = s+len; | |
2001 while( *(--t) != ')' ) ; // Find close paren | |
2002 | |
2003 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 ); | |
2004 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 ); | |
2005 int cnt = 0; | |
2006 if (!is_static) { | |
2007 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature | |
2008 } | |
2009 | |
2010 while( s < t ) { | |
2011 switch( *s++ ) { // Switch on signature character | |
2012 case 'B': sig_bt[cnt++] = T_BYTE; break; | |
2013 case 'C': sig_bt[cnt++] = T_CHAR; break; | |
2014 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break; | |
2015 case 'F': sig_bt[cnt++] = T_FLOAT; break; | |
2016 case 'I': sig_bt[cnt++] = T_INT; break; | |
2017 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break; | |
2018 case 'S': sig_bt[cnt++] = T_SHORT; break; | |
2019 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break; | |
2020 case 'V': sig_bt[cnt++] = T_VOID; break; | |
2021 case 'L': // Oop | |
2022 while( *s++ != ';' ) ; // Skip signature | |
2023 sig_bt[cnt++] = T_OBJECT; | |
2024 break; | |
2025 case '[': { // Array | |
2026 do { // Skip optional size | |
2027 while( *s >= '0' && *s <= '9' ) s++; | |
2028 } while( *s++ == '[' ); // Nested arrays? | |
2029 // Skip element type | |
2030 if( s[-1] == 'L' ) | |
2031 while( *s++ != ';' ) ; // Skip signature | |
2032 sig_bt[cnt++] = T_ARRAY; | |
2033 break; | |
2034 } | |
2035 default : ShouldNotReachHere(); | |
2036 } | |
2037 } | |
2038 assert( cnt < 256, "grow table size" ); | |
2039 | |
2040 int comp_args_on_stack; | |
2041 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true); | |
2042 | |
2043 // the calling convention doesn't count out_preserve_stack_slots so | |
2044 // we must add that in to get "true" stack offsets. | |
2045 | |
2046 if (comp_args_on_stack) { | |
2047 for (int i = 0; i < cnt; i++) { | |
2048 VMReg reg1 = regs[i].first(); | |
2049 if( reg1->is_stack()) { | |
2050 // Yuck | |
2051 reg1 = reg1->bias(out_preserve_stack_slots()); | |
2052 } | |
2053 VMReg reg2 = regs[i].second(); | |
2054 if( reg2->is_stack()) { | |
2055 // Yuck | |
2056 reg2 = reg2->bias(out_preserve_stack_slots()); | |
2057 } | |
2058 regs[i].set_pair(reg2, reg1); | |
2059 } | |
2060 } | |
2061 | |
2062 // results | |
2063 *arg_size = cnt; | |
2064 return regs; | |
2065 } | |
2066 | |
2067 // OSR Migration Code | |
2068 // | |
2069 // This code is used convert interpreter frames into compiled frames. It is | |
2070 // called from very start of a compiled OSR nmethod. A temp array is | |
2071 // allocated to hold the interesting bits of the interpreter frame. All | |
2072 // active locks are inflated to allow them to move. The displaced headers and | |
2073 // active interpeter locals are copied into the temp buffer. Then we return | |
2074 // back to the compiled code. The compiled code then pops the current | |
2075 // interpreter frame off the stack and pushes a new compiled frame. Then it | |
2076 // copies the interpreter locals and displaced headers where it wants. | |
2077 // Finally it calls back to free the temp buffer. | |
2078 // | |
2079 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed. | |
2080 | |
2081 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) ) | |
2082 | |
2083 #ifdef IA64 | |
2084 ShouldNotReachHere(); // NYI | |
2085 #endif /* IA64 */ | |
2086 | |
2087 // | |
2088 // This code is dependent on the memory layout of the interpreter local | |
2089 // array and the monitors. On all of our platforms the layout is identical | |
2090 // so this code is shared. If some platform lays the their arrays out | |
2091 // differently then this code could move to platform specific code or | |
2092 // the code here could be modified to copy items one at a time using | |
2093 // frame accessor methods and be platform independent. | |
2094 | |
2095 frame fr = thread->last_frame(); | |
2096 assert( fr.is_interpreted_frame(), "" ); | |
2097 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" ); | |
2098 | |
2099 // Figure out how many monitors are active. | |
2100 int active_monitor_count = 0; | |
2101 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end(); | |
2102 kptr < fr.interpreter_frame_monitor_begin(); | |
2103 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) { | |
2104 if( kptr->obj() != NULL ) active_monitor_count++; | |
2105 } | |
2106 | |
2107 // QQQ we could place number of active monitors in the array so that compiled code | |
2108 // could double check it. | |
2109 | |
2110 methodOop moop = fr.interpreter_frame_method(); | |
2111 int max_locals = moop->max_locals(); | |
2112 // Allocate temp buffer, 1 word per local & 2 per active monitor | |
2113 int buf_size_words = max_locals + active_monitor_count*2; | |
2114 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words); | |
2115 | |
2116 // Copy the locals. Order is preserved so that loading of longs works. | |
2117 // Since there's no GC I can copy the oops blindly. | |
2118 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code"); | |
2119 if (TaggedStackInterpreter) { | |
2120 for (int i = 0; i < max_locals; i++) { | |
2121 // copy only each local separately to the buffer avoiding the tag | |
2122 buf[i] = *fr.interpreter_frame_local_at(max_locals-i-1); | |
2123 } | |
2124 } else { | |
2125 Copy::disjoint_words( | |
2126 (HeapWord*)fr.interpreter_frame_local_at(max_locals-1), | |
2127 (HeapWord*)&buf[0], | |
2128 max_locals); | |
2129 } | |
2130 | |
2131 // Inflate locks. Copy the displaced headers. Be careful, there can be holes. | |
2132 int i = max_locals; | |
2133 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end(); | |
2134 kptr2 < fr.interpreter_frame_monitor_begin(); | |
2135 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) { | |
2136 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array | |
2137 BasicLock *lock = kptr2->lock(); | |
2138 // Inflate so the displaced header becomes position-independent | |
2139 if (lock->displaced_header()->is_unlocked()) | |
2140 ObjectSynchronizer::inflate_helper(kptr2->obj()); | |
2141 // Now the displaced header is free to move | |
2142 buf[i++] = (intptr_t)lock->displaced_header(); | |
2143 buf[i++] = (intptr_t)kptr2->obj(); | |
2144 } | |
2145 } | |
2146 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" ); | |
2147 | |
2148 return buf; | |
2149 JRT_END | |
2150 | |
2151 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) ) | |
2152 FREE_C_HEAP_ARRAY(intptr_t,buf); | |
2153 JRT_END | |
2154 | |
2155 #ifndef PRODUCT | |
2156 bool AdapterHandlerLibrary::contains(CodeBlob* b) { | |
2157 | |
2158 for (int i = 0 ; i < _handlers->length() ; i++) { | |
2159 AdapterHandlerEntry* a = get_entry(i); | |
2160 if ( a != NULL && b == CodeCache::find_blob(a->get_i2c_entry()) ) return true; | |
2161 } | |
2162 return false; | |
2163 } | |
2164 | |
2165 void AdapterHandlerLibrary::print_handler(CodeBlob* b) { | |
2166 | |
2167 for (int i = 0 ; i < _handlers->length() ; i++) { | |
2168 AdapterHandlerEntry* a = get_entry(i); | |
2169 if ( a != NULL && b == CodeCache::find_blob(a->get_i2c_entry()) ) { | |
2170 tty->print("Adapter for signature: "); | |
2171 // Fingerprinter::print(_fingerprints->at(i)); | |
2172 tty->print("0x%" FORMAT64_MODIFIER "x", _fingerprints->at(i)); | |
2173 tty->print_cr(" i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT, | |
2174 a->get_i2c_entry(), a->get_c2i_entry(), a->get_c2i_unverified_entry()); | |
2175 | |
2176 return; | |
2177 } | |
2178 } | |
2179 assert(false, "Should have found handler"); | |
2180 } | |
2181 #endif /* PRODUCT */ |