Thu, 29 Mar 2018 06:53:04 -0400
8164480: Crash with assert(handler_address == SharedRuntime::compute_compiled_exc_handler(..) failed: Must be the same
Summary: Exception checking code needs to handle pre-allocated exceptions.
Reviewed-by: thartmann, kvn
1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/scopeDesc.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compilerOracle.hpp"
34 #include "compiler/disassembler.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/interpreterRuntime.hpp"
37 #include "memory/gcLocker.inline.hpp"
38 #include "memory/universe.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/forte.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "prims/jvmtiRedefineClassesTrace.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "prims/nativeLookup.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/biasedLocking.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/init.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/stubRoutines.hpp"
53 #include "runtime/vframe.hpp"
54 #include "runtime/vframeArray.hpp"
55 #include "utilities/copy.hpp"
56 #include "utilities/dtrace.hpp"
57 #include "utilities/events.hpp"
58 #include "utilities/hashtable.inline.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/xmlstream.hpp"
61 #ifdef TARGET_ARCH_x86
62 # include "nativeInst_x86.hpp"
63 # include "vmreg_x86.inline.hpp"
64 #endif
65 #ifdef TARGET_ARCH_sparc
66 # include "nativeInst_sparc.hpp"
67 # include "vmreg_sparc.inline.hpp"
68 #endif
69 #ifdef TARGET_ARCH_zero
70 # include "nativeInst_zero.hpp"
71 # include "vmreg_zero.inline.hpp"
72 #endif
73 #ifdef TARGET_ARCH_arm
74 # include "nativeInst_arm.hpp"
75 # include "vmreg_arm.inline.hpp"
76 #endif
77 #ifdef TARGET_ARCH_ppc
78 # include "nativeInst_ppc.hpp"
79 # include "vmreg_ppc.inline.hpp"
80 #endif
81 #ifdef COMPILER1
82 #include "c1/c1_Runtime1.hpp"
83 #endif
85 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
87 // Shared stub locations
88 RuntimeStub* SharedRuntime::_wrong_method_blob;
89 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
90 RuntimeStub* SharedRuntime::_ic_miss_blob;
91 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
92 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
93 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
95 DeoptimizationBlob* SharedRuntime::_deopt_blob;
96 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
97 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
98 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
100 #ifdef COMPILER2
101 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
102 #endif // COMPILER2
105 //----------------------------generate_stubs-----------------------------------
106 void SharedRuntime::generate_stubs() {
107 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
108 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
109 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
110 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
111 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
112 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
114 #ifdef COMPILER2
115 // Vectors are generated only by C2.
116 if (is_wide_vector(MaxVectorSize)) {
117 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
118 }
119 #endif // COMPILER2
120 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
121 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
123 generate_deopt_blob();
125 #ifdef COMPILER2
126 generate_uncommon_trap_blob();
127 #endif // COMPILER2
128 }
130 #include <math.h>
132 #ifndef USDT2
133 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t);
134 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int,
135 char*, int, char*, int, char*, int);
136 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int,
137 char*, int, char*, int, char*, int);
138 #endif /* !USDT2 */
140 // Implementation of SharedRuntime
142 #ifndef PRODUCT
143 // For statistics
144 int SharedRuntime::_ic_miss_ctr = 0;
145 int SharedRuntime::_wrong_method_ctr = 0;
146 int SharedRuntime::_resolve_static_ctr = 0;
147 int SharedRuntime::_resolve_virtual_ctr = 0;
148 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
149 int SharedRuntime::_implicit_null_throws = 0;
150 int SharedRuntime::_implicit_div0_throws = 0;
151 int SharedRuntime::_throw_null_ctr = 0;
153 int SharedRuntime::_nof_normal_calls = 0;
154 int SharedRuntime::_nof_optimized_calls = 0;
155 int SharedRuntime::_nof_inlined_calls = 0;
156 int SharedRuntime::_nof_megamorphic_calls = 0;
157 int SharedRuntime::_nof_static_calls = 0;
158 int SharedRuntime::_nof_inlined_static_calls = 0;
159 int SharedRuntime::_nof_interface_calls = 0;
160 int SharedRuntime::_nof_optimized_interface_calls = 0;
161 int SharedRuntime::_nof_inlined_interface_calls = 0;
162 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
163 int SharedRuntime::_nof_removable_exceptions = 0;
165 int SharedRuntime::_new_instance_ctr=0;
166 int SharedRuntime::_new_array_ctr=0;
167 int SharedRuntime::_multi1_ctr=0;
168 int SharedRuntime::_multi2_ctr=0;
169 int SharedRuntime::_multi3_ctr=0;
170 int SharedRuntime::_multi4_ctr=0;
171 int SharedRuntime::_multi5_ctr=0;
172 int SharedRuntime::_mon_enter_stub_ctr=0;
173 int SharedRuntime::_mon_exit_stub_ctr=0;
174 int SharedRuntime::_mon_enter_ctr=0;
175 int SharedRuntime::_mon_exit_ctr=0;
176 int SharedRuntime::_partial_subtype_ctr=0;
177 int SharedRuntime::_jbyte_array_copy_ctr=0;
178 int SharedRuntime::_jshort_array_copy_ctr=0;
179 int SharedRuntime::_jint_array_copy_ctr=0;
180 int SharedRuntime::_jlong_array_copy_ctr=0;
181 int SharedRuntime::_oop_array_copy_ctr=0;
182 int SharedRuntime::_checkcast_array_copy_ctr=0;
183 int SharedRuntime::_unsafe_array_copy_ctr=0;
184 int SharedRuntime::_generic_array_copy_ctr=0;
185 int SharedRuntime::_slow_array_copy_ctr=0;
186 int SharedRuntime::_find_handler_ctr=0;
187 int SharedRuntime::_rethrow_ctr=0;
189 int SharedRuntime::_ICmiss_index = 0;
190 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
191 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
194 void SharedRuntime::trace_ic_miss(address at) {
195 for (int i = 0; i < _ICmiss_index; i++) {
196 if (_ICmiss_at[i] == at) {
197 _ICmiss_count[i]++;
198 return;
199 }
200 }
201 int index = _ICmiss_index++;
202 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
203 _ICmiss_at[index] = at;
204 _ICmiss_count[index] = 1;
205 }
207 void SharedRuntime::print_ic_miss_histogram() {
208 if (ICMissHistogram) {
209 tty->print_cr ("IC Miss Histogram:");
210 int tot_misses = 0;
211 for (int i = 0; i < _ICmiss_index; i++) {
212 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]);
213 tot_misses += _ICmiss_count[i];
214 }
215 tty->print_cr ("Total IC misses: %7d", tot_misses);
216 }
217 }
218 #endif // PRODUCT
220 #if INCLUDE_ALL_GCS
222 // G1 write-barrier pre: executed before a pointer store.
223 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
224 if (orig == NULL) {
225 assert(false, "should be optimized out");
226 return;
227 }
228 assert(orig->is_oop(true /* ignore mark word */), "Error");
229 // store the original value that was in the field reference
230 thread->satb_mark_queue().enqueue(orig);
231 JRT_END
233 // G1 write-barrier post: executed after a pointer store.
234 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
235 thread->dirty_card_queue().enqueue(card_addr);
236 JRT_END
238 #endif // INCLUDE_ALL_GCS
241 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
242 return x * y;
243 JRT_END
246 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
247 if (x == min_jlong && y == CONST64(-1)) {
248 return x;
249 } else {
250 return x / y;
251 }
252 JRT_END
255 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
256 if (x == min_jlong && y == CONST64(-1)) {
257 return 0;
258 } else {
259 return x % y;
260 }
261 JRT_END
264 const juint float_sign_mask = 0x7FFFFFFF;
265 const juint float_infinity = 0x7F800000;
266 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
267 const julong double_infinity = CONST64(0x7FF0000000000000);
269 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
270 #ifdef _WIN64
271 // 64-bit Windows on amd64 returns the wrong values for
272 // infinity operands.
273 union { jfloat f; juint i; } xbits, ybits;
274 xbits.f = x;
275 ybits.f = y;
276 // x Mod Infinity == x unless x is infinity
277 if ( ((xbits.i & float_sign_mask) != float_infinity) &&
278 ((ybits.i & float_sign_mask) == float_infinity) ) {
279 return x;
280 }
281 #endif
282 return ((jfloat)fmod((double)x,(double)y));
283 JRT_END
286 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
287 #ifdef _WIN64
288 union { jdouble d; julong l; } xbits, ybits;
289 xbits.d = x;
290 ybits.d = y;
291 // x Mod Infinity == x unless x is infinity
292 if ( ((xbits.l & double_sign_mask) != double_infinity) &&
293 ((ybits.l & double_sign_mask) == double_infinity) ) {
294 return x;
295 }
296 #endif
297 return ((jdouble)fmod((double)x,(double)y));
298 JRT_END
300 #ifdef __SOFTFP__
301 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
302 return x + y;
303 JRT_END
305 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
306 return x - y;
307 JRT_END
309 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
310 return x * y;
311 JRT_END
313 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
314 return x / y;
315 JRT_END
317 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
318 return x + y;
319 JRT_END
321 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
322 return x - y;
323 JRT_END
325 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
326 return x * y;
327 JRT_END
329 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
330 return x / y;
331 JRT_END
333 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
334 return (jfloat)x;
335 JRT_END
337 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
338 return (jdouble)x;
339 JRT_END
341 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
342 return (jdouble)x;
343 JRT_END
345 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
346 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
347 JRT_END
349 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
350 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
351 JRT_END
353 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
354 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
355 JRT_END
357 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
358 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
359 JRT_END
361 // Functions to return the opposite of the aeabi functions for nan.
362 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
363 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
364 JRT_END
366 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
367 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
368 JRT_END
370 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
371 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
372 JRT_END
374 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
375 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
376 JRT_END
378 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
379 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
380 JRT_END
382 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
383 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
384 JRT_END
386 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
387 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
388 JRT_END
390 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
391 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
392 JRT_END
394 // Intrinsics make gcc generate code for these.
395 float SharedRuntime::fneg(float f) {
396 return -f;
397 }
399 double SharedRuntime::dneg(double f) {
400 return -f;
401 }
403 #endif // __SOFTFP__
405 #if defined(__SOFTFP__) || defined(E500V2)
406 // Intrinsics make gcc generate code for these.
407 double SharedRuntime::dabs(double f) {
408 return (f <= (double)0.0) ? (double)0.0 - f : f;
409 }
411 #endif
413 #if defined(__SOFTFP__) || defined(PPC32)
414 double SharedRuntime::dsqrt(double f) {
415 return sqrt(f);
416 }
417 #endif
419 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
420 if (g_isnan(x))
421 return 0;
422 if (x >= (jfloat) max_jint)
423 return max_jint;
424 if (x <= (jfloat) min_jint)
425 return min_jint;
426 return (jint) x;
427 JRT_END
430 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
431 if (g_isnan(x))
432 return 0;
433 if (x >= (jfloat) max_jlong)
434 return max_jlong;
435 if (x <= (jfloat) min_jlong)
436 return min_jlong;
437 return (jlong) x;
438 JRT_END
441 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
442 if (g_isnan(x))
443 return 0;
444 if (x >= (jdouble) max_jint)
445 return max_jint;
446 if (x <= (jdouble) min_jint)
447 return min_jint;
448 return (jint) x;
449 JRT_END
452 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
453 if (g_isnan(x))
454 return 0;
455 if (x >= (jdouble) max_jlong)
456 return max_jlong;
457 if (x <= (jdouble) min_jlong)
458 return min_jlong;
459 return (jlong) x;
460 JRT_END
463 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
464 return (jfloat)x;
465 JRT_END
468 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
469 return (jfloat)x;
470 JRT_END
473 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
474 return (jdouble)x;
475 JRT_END
477 // Exception handling accross interpreter/compiler boundaries
478 //
479 // exception_handler_for_return_address(...) returns the continuation address.
480 // The continuation address is the entry point of the exception handler of the
481 // previous frame depending on the return address.
483 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
484 assert(frame::verify_return_pc(return_address), err_msg("must be a return address: " INTPTR_FORMAT, return_address));
485 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
487 // Reset method handle flag.
488 thread->set_is_method_handle_return(false);
490 // The fastest case first
491 CodeBlob* blob = CodeCache::find_blob(return_address);
492 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL;
493 if (nm != NULL) {
494 // Set flag if return address is a method handle call site.
495 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
496 // native nmethods don't have exception handlers
497 assert(!nm->is_native_method(), "no exception handler");
498 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
499 if (nm->is_deopt_pc(return_address)) {
500 // If we come here because of a stack overflow, the stack may be
501 // unguarded. Reguard the stack otherwise if we return to the
502 // deopt blob and the stack bang causes a stack overflow we
503 // crash.
504 bool guard_pages_enabled = thread->stack_yellow_zone_enabled();
505 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
506 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
507 return SharedRuntime::deopt_blob()->unpack_with_exception();
508 } else {
509 return nm->exception_begin();
510 }
511 }
513 // Entry code
514 if (StubRoutines::returns_to_call_stub(return_address)) {
515 return StubRoutines::catch_exception_entry();
516 }
517 // Interpreted code
518 if (Interpreter::contains(return_address)) {
519 return Interpreter::rethrow_exception_entry();
520 }
522 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
523 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
525 #ifndef PRODUCT
526 { ResourceMark rm;
527 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address);
528 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
529 tty->print_cr("b) other problem");
530 }
531 #endif // PRODUCT
533 ShouldNotReachHere();
534 return NULL;
535 }
538 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
539 return raw_exception_handler_for_return_address(thread, return_address);
540 JRT_END
543 address SharedRuntime::get_poll_stub(address pc) {
544 address stub;
545 // Look up the code blob
546 CodeBlob *cb = CodeCache::find_blob(pc);
548 // Should be an nmethod
549 guarantee(cb != NULL && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
551 // Look up the relocation information
552 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc),
553 "safepoint polling: type must be poll" );
555 assert( ((NativeInstruction*)pc)->is_safepoint_poll(),
556 "Only polling locations are used for safepoint");
558 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);
559 bool has_wide_vectors = ((nmethod*)cb)->has_wide_vectors();
560 if (at_poll_return) {
561 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
562 "polling page return stub not created yet");
563 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
564 } else if (has_wide_vectors) {
565 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
566 "polling page vectors safepoint stub not created yet");
567 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
568 } else {
569 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
570 "polling page safepoint stub not created yet");
571 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
572 }
573 #ifndef PRODUCT
574 if( TraceSafepoint ) {
575 char buf[256];
576 jio_snprintf(buf, sizeof(buf),
577 "... found polling page %s exception at pc = "
578 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
579 at_poll_return ? "return" : "loop",
580 (intptr_t)pc, (intptr_t)stub);
581 tty->print_raw_cr(buf);
582 }
583 #endif // PRODUCT
584 return stub;
585 }
588 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
589 assert(caller.is_interpreted_frame(), "");
590 int args_size = ArgumentSizeComputer(sig).size() + 1;
591 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
592 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
593 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
594 return result;
595 }
598 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
599 if (JvmtiExport::can_post_on_exceptions()) {
600 vframeStream vfst(thread, true);
601 methodHandle method = methodHandle(thread, vfst.method());
602 address bcp = method()->bcp_from(vfst.bci());
603 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
604 }
605 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
606 }
608 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
609 Handle h_exception = Exceptions::new_exception(thread, name, message);
610 throw_and_post_jvmti_exception(thread, h_exception);
611 }
613 // The interpreter code to call this tracing function is only
614 // called/generated when TraceRedefineClasses has the right bits
615 // set. Since obsolete methods are never compiled, we don't have
616 // to modify the compilers to generate calls to this function.
617 //
618 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
619 JavaThread* thread, Method* method))
620 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
622 if (method->is_obsolete()) {
623 // We are calling an obsolete method, but this is not necessarily
624 // an error. Our method could have been redefined just after we
625 // fetched the Method* from the constant pool.
627 // RC_TRACE macro has an embedded ResourceMark
628 RC_TRACE_WITH_THREAD(0x00001000, thread,
629 ("calling obsolete method '%s'",
630 method->name_and_sig_as_C_string()));
631 if (RC_TRACE_ENABLED(0x00002000)) {
632 // this option is provided to debug calls to obsolete methods
633 guarantee(false, "faulting at call to an obsolete method.");
634 }
635 }
636 return 0;
637 JRT_END
639 // ret_pc points into caller; we are returning caller's exception handler
640 // for given exception
641 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
642 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
643 assert(nm != NULL, "must exist");
644 ResourceMark rm;
646 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
647 // determine handler bci, if any
648 EXCEPTION_MARK;
650 int handler_bci = -1;
651 int scope_depth = 0;
652 if (!force_unwind) {
653 int bci = sd->bci();
654 bool recursive_exception = false;
655 do {
656 bool skip_scope_increment = false;
657 // exception handler lookup
658 KlassHandle ek (THREAD, exception->klass());
659 methodHandle mh(THREAD, sd->method());
660 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
661 if (HAS_PENDING_EXCEPTION) {
662 recursive_exception = true;
663 // We threw an exception while trying to find the exception handler.
664 // Transfer the new exception to the exception handle which will
665 // be set into thread local storage, and do another lookup for an
666 // exception handler for this exception, this time starting at the
667 // BCI of the exception handler which caused the exception to be
668 // thrown (bugs 4307310 and 4546590). Set "exception" reference
669 // argument to ensure that the correct exception is thrown (4870175).
670 recursive_exception_occurred = true;
671 exception = Handle(THREAD, PENDING_EXCEPTION);
672 CLEAR_PENDING_EXCEPTION;
673 if (handler_bci >= 0) {
674 bci = handler_bci;
675 handler_bci = -1;
676 skip_scope_increment = true;
677 }
678 }
679 else {
680 recursive_exception = false;
681 }
682 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
683 sd = sd->sender();
684 if (sd != NULL) {
685 bci = sd->bci();
686 }
687 ++scope_depth;
688 }
689 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
690 }
692 // found handling method => lookup exception handler
693 int catch_pco = ret_pc - nm->code_begin();
695 ExceptionHandlerTable table(nm);
696 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
697 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
698 // Allow abbreviated catch tables. The idea is to allow a method
699 // to materialize its exceptions without committing to the exact
700 // routing of exceptions. In particular this is needed for adding
701 // a synthethic handler to unlock monitors when inlining
702 // synchonized methods since the unlock path isn't represented in
703 // the bytecodes.
704 t = table.entry_for(catch_pco, -1, 0);
705 }
707 #ifdef COMPILER1
708 if (t == NULL && nm->is_compiled_by_c1()) {
709 assert(nm->unwind_handler_begin() != NULL, "");
710 return nm->unwind_handler_begin();
711 }
712 #endif
714 if (t == NULL) {
715 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci);
716 tty->print_cr(" Exception:");
717 exception->print();
718 tty->cr();
719 tty->print_cr(" Compiled exception table :");
720 table.print();
721 nm->print_code();
722 guarantee(false, "missing exception handler");
723 return NULL;
724 }
726 return nm->code_begin() + t->pco();
727 }
729 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
730 // These errors occur only at call sites
731 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
732 JRT_END
734 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
735 // These errors occur only at call sites
736 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
737 JRT_END
739 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
740 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
741 JRT_END
743 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
744 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
745 JRT_END
747 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
748 // This entry point is effectively only used for NullPointerExceptions which occur at inline
749 // cache sites (when the callee activation is not yet set up) so we are at a call site
750 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
751 JRT_END
753 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
754 // We avoid using the normal exception construction in this case because
755 // it performs an upcall to Java, and we're already out of stack space.
756 Klass* k = SystemDictionary::StackOverflowError_klass();
757 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
758 Handle exception (thread, exception_oop);
759 if (StackTraceInThrowable) {
760 java_lang_Throwable::fill_in_stack_trace(exception);
761 }
762 // Increment counter for hs_err file reporting
763 Atomic::inc(&Exceptions::_stack_overflow_errors);
764 throw_and_post_jvmti_exception(thread, exception);
765 JRT_END
767 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
768 address pc,
769 SharedRuntime::ImplicitExceptionKind exception_kind)
770 {
771 address target_pc = NULL;
773 if (Interpreter::contains(pc)) {
774 #ifdef CC_INTERP
775 // C++ interpreter doesn't throw implicit exceptions
776 ShouldNotReachHere();
777 #else
778 switch (exception_kind) {
779 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
780 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
781 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
782 default: ShouldNotReachHere();
783 }
784 #endif // !CC_INTERP
785 } else {
786 switch (exception_kind) {
787 case STACK_OVERFLOW: {
788 // Stack overflow only occurs upon frame setup; the callee is
789 // going to be unwound. Dispatch to a shared runtime stub
790 // which will cause the StackOverflowError to be fabricated
791 // and processed.
792 // Stack overflow should never occur during deoptimization:
793 // the compiled method bangs the stack by as much as the
794 // interpreter would need in case of a deoptimization. The
795 // deoptimization blob and uncommon trap blob bang the stack
796 // in a debug VM to verify the correctness of the compiled
797 // method stack banging.
798 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
799 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, pc);
800 return StubRoutines::throw_StackOverflowError_entry();
801 }
803 case IMPLICIT_NULL: {
804 if (VtableStubs::contains(pc)) {
805 // We haven't yet entered the callee frame. Fabricate an
806 // exception and begin dispatching it in the caller. Since
807 // the caller was at a call site, it's safe to destroy all
808 // caller-saved registers, as these entry points do.
809 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
811 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
812 if (vt_stub == NULL) return NULL;
814 if (vt_stub->is_abstract_method_error(pc)) {
815 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
816 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, pc);
817 return StubRoutines::throw_AbstractMethodError_entry();
818 } else {
819 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, pc);
820 return StubRoutines::throw_NullPointerException_at_call_entry();
821 }
822 } else {
823 CodeBlob* cb = CodeCache::find_blob(pc);
825 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
826 if (cb == NULL) return NULL;
828 // Exception happened in CodeCache. Must be either:
829 // 1. Inline-cache check in C2I handler blob,
830 // 2. Inline-cache check in nmethod, or
831 // 3. Implict null exception in nmethod
833 if (!cb->is_nmethod()) {
834 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
835 if (!is_in_blob) {
836 cb->print();
837 fatal(err_msg("exception happened outside interpreter, nmethods and vtable stubs at pc " INTPTR_FORMAT, pc));
838 }
839 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, pc);
840 // There is no handler here, so we will simply unwind.
841 return StubRoutines::throw_NullPointerException_at_call_entry();
842 }
844 // Otherwise, it's an nmethod. Consult its exception handlers.
845 nmethod* nm = (nmethod*)cb;
846 if (nm->inlinecache_check_contains(pc)) {
847 // exception happened inside inline-cache check code
848 // => the nmethod is not yet active (i.e., the frame
849 // is not set up yet) => use return address pushed by
850 // caller => don't push another return address
851 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, pc);
852 return StubRoutines::throw_NullPointerException_at_call_entry();
853 }
855 if (nm->method()->is_method_handle_intrinsic()) {
856 // exception happened inside MH dispatch code, similar to a vtable stub
857 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, pc);
858 return StubRoutines::throw_NullPointerException_at_call_entry();
859 }
861 #ifndef PRODUCT
862 _implicit_null_throws++;
863 #endif
864 target_pc = nm->continuation_for_implicit_exception(pc);
865 // If there's an unexpected fault, target_pc might be NULL,
866 // in which case we want to fall through into the normal
867 // error handling code.
868 }
870 break; // fall through
871 }
874 case IMPLICIT_DIVIDE_BY_ZERO: {
875 nmethod* nm = CodeCache::find_nmethod(pc);
876 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");
877 #ifndef PRODUCT
878 _implicit_div0_throws++;
879 #endif
880 target_pc = nm->continuation_for_implicit_exception(pc);
881 // If there's an unexpected fault, target_pc might be NULL,
882 // in which case we want to fall through into the normal
883 // error handling code.
884 break; // fall through
885 }
887 default: ShouldNotReachHere();
888 }
890 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
892 // for AbortVMOnException flag
893 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));
894 if (exception_kind == IMPLICIT_NULL) {
895 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
896 } else {
897 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
898 }
899 return target_pc;
900 }
902 ShouldNotReachHere();
903 return NULL;
904 }
907 /**
908 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
909 * installed in the native function entry of all native Java methods before
910 * they get linked to their actual native methods.
911 *
912 * \note
913 * This method actually never gets called! The reason is because
914 * the interpreter's native entries call NativeLookup::lookup() which
915 * throws the exception when the lookup fails. The exception is then
916 * caught and forwarded on the return from NativeLookup::lookup() call
917 * before the call to the native function. This might change in the future.
918 */
919 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
920 {
921 // We return a bad value here to make sure that the exception is
922 // forwarded before we look at the return value.
923 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
924 }
925 JNI_END
927 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
928 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
929 }
932 #ifndef PRODUCT
933 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
934 const frame f = thread->last_frame();
935 assert(f.is_interpreted_frame(), "must be an interpreted frame");
936 #ifndef PRODUCT
937 methodHandle mh(THREAD, f.interpreter_frame_method());
938 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
939 #endif // !PRODUCT
940 return preserve_this_value;
941 JRT_END
942 #endif // !PRODUCT
945 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts))
946 os::yield_all(attempts);
947 JRT_END
950 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
951 assert(obj->is_oop(), "must be a valid oop");
952 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
953 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
954 JRT_END
957 jlong SharedRuntime::get_java_tid(Thread* thread) {
958 if (thread != NULL) {
959 if (thread->is_Java_thread()) {
960 oop obj = ((JavaThread*)thread)->threadObj();
961 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
962 }
963 }
964 return 0;
965 }
967 /**
968 * This function ought to be a void function, but cannot be because
969 * it gets turned into a tail-call on sparc, which runs into dtrace bug
970 * 6254741. Once that is fixed we can remove the dummy return value.
971 */
972 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
973 return dtrace_object_alloc_base(Thread::current(), o, size);
974 }
976 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
977 assert(DTraceAllocProbes, "wrong call");
978 Klass* klass = o->klass();
979 Symbol* name = klass->name();
980 #ifndef USDT2
981 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread),
982 name->bytes(), name->utf8_length(), size * HeapWordSize);
983 #else /* USDT2 */
984 HOTSPOT_OBJECT_ALLOC(
985 get_java_tid(thread),
986 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
987 #endif /* USDT2 */
988 return 0;
989 }
991 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
992 JavaThread* thread, Method* method))
993 assert(DTraceMethodProbes, "wrong call");
994 Symbol* kname = method->klass_name();
995 Symbol* name = method->name();
996 Symbol* sig = method->signature();
997 #ifndef USDT2
998 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread),
999 kname->bytes(), kname->utf8_length(),
1000 name->bytes(), name->utf8_length(),
1001 sig->bytes(), sig->utf8_length());
1002 #else /* USDT2 */
1003 HOTSPOT_METHOD_ENTRY(
1004 get_java_tid(thread),
1005 (char *) kname->bytes(), kname->utf8_length(),
1006 (char *) name->bytes(), name->utf8_length(),
1007 (char *) sig->bytes(), sig->utf8_length());
1008 #endif /* USDT2 */
1009 return 0;
1010 JRT_END
1012 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1013 JavaThread* thread, Method* method))
1014 assert(DTraceMethodProbes, "wrong call");
1015 Symbol* kname = method->klass_name();
1016 Symbol* name = method->name();
1017 Symbol* sig = method->signature();
1018 #ifndef USDT2
1019 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread),
1020 kname->bytes(), kname->utf8_length(),
1021 name->bytes(), name->utf8_length(),
1022 sig->bytes(), sig->utf8_length());
1023 #else /* USDT2 */
1024 HOTSPOT_METHOD_RETURN(
1025 get_java_tid(thread),
1026 (char *) kname->bytes(), kname->utf8_length(),
1027 (char *) name->bytes(), name->utf8_length(),
1028 (char *) sig->bytes(), sig->utf8_length());
1029 #endif /* USDT2 */
1030 return 0;
1031 JRT_END
1034 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1035 // for a call current in progress, i.e., arguments has been pushed on stack
1036 // put callee has not been invoked yet. Used by: resolve virtual/static,
1037 // vtable updates, etc. Caller frame must be compiled.
1038 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1039 ResourceMark rm(THREAD);
1041 // last java frame on stack (which includes native call frames)
1042 vframeStream vfst(thread, true); // Do not skip and javaCalls
1044 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));
1045 }
1048 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1049 // for a call current in progress, i.e., arguments has been pushed on stack
1050 // but callee has not been invoked yet. Caller frame must be compiled.
1051 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1052 vframeStream& vfst,
1053 Bytecodes::Code& bc,
1054 CallInfo& callinfo, TRAPS) {
1055 Handle receiver;
1056 Handle nullHandle; //create a handy null handle for exception returns
1058 assert(!vfst.at_end(), "Java frame must exist");
1060 // Find caller and bci from vframe
1061 methodHandle caller(THREAD, vfst.method());
1062 int bci = vfst.bci();
1064 // Find bytecode
1065 Bytecode_invoke bytecode(caller, bci);
1066 bc = bytecode.invoke_code();
1067 int bytecode_index = bytecode.index();
1069 // Find receiver for non-static call
1070 if (bc != Bytecodes::_invokestatic &&
1071 bc != Bytecodes::_invokedynamic &&
1072 bc != Bytecodes::_invokehandle) {
1073 // This register map must be update since we need to find the receiver for
1074 // compiled frames. The receiver might be in a register.
1075 RegisterMap reg_map2(thread);
1076 frame stubFrame = thread->last_frame();
1077 // Caller-frame is a compiled frame
1078 frame callerFrame = stubFrame.sender(®_map2);
1080 methodHandle callee = bytecode.static_target(CHECK_(nullHandle));
1081 if (callee.is_null()) {
1082 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1083 }
1084 // Retrieve from a compiled argument list
1085 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1087 if (receiver.is_null()) {
1088 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1089 }
1090 }
1092 // Resolve method. This is parameterized by bytecode.
1093 constantPoolHandle constants(THREAD, caller->constants());
1094 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1095 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));
1097 #ifdef ASSERT
1098 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1099 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic && bc != Bytecodes::_invokehandle) {
1100 assert(receiver.not_null(), "should have thrown exception");
1101 KlassHandle receiver_klass(THREAD, receiver->klass());
1102 Klass* rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));
1103 // klass is already loaded
1104 KlassHandle static_receiver_klass(THREAD, rk);
1105 // Method handle invokes might have been optimized to a direct call
1106 // so don't check for the receiver class.
1107 // FIXME this weakens the assert too much
1108 methodHandle callee = callinfo.selected_method();
1109 assert(receiver_klass->is_subtype_of(static_receiver_klass()) ||
1110 callee->is_method_handle_intrinsic() ||
1111 callee->is_compiled_lambda_form(),
1112 "actual receiver must be subclass of static receiver klass");
1113 if (receiver_klass->oop_is_instance()) {
1114 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1115 tty->print_cr("ERROR: Klass not yet initialized!!");
1116 receiver_klass()->print();
1117 }
1118 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1119 }
1120 }
1121 #endif
1123 return receiver;
1124 }
1126 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1127 ResourceMark rm(THREAD);
1128 // We need first to check if any Java activations (compiled, interpreted)
1129 // exist on the stack since last JavaCall. If not, we need
1130 // to get the target method from the JavaCall wrapper.
1131 vframeStream vfst(thread, true); // Do not skip any javaCalls
1132 methodHandle callee_method;
1133 if (vfst.at_end()) {
1134 // No Java frames were found on stack since we did the JavaCall.
1135 // Hence the stack can only contain an entry_frame. We need to
1136 // find the target method from the stub frame.
1137 RegisterMap reg_map(thread, false);
1138 frame fr = thread->last_frame();
1139 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1140 fr = fr.sender(®_map);
1141 assert(fr.is_entry_frame(), "must be");
1142 // fr is now pointing to the entry frame.
1143 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1144 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1145 } else {
1146 Bytecodes::Code bc;
1147 CallInfo callinfo;
1148 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1149 callee_method = callinfo.selected_method();
1150 }
1151 assert(callee_method()->is_method(), "must be");
1152 return callee_method;
1153 }
1155 // Resolves a call.
1156 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1157 bool is_virtual,
1158 bool is_optimized, TRAPS) {
1159 methodHandle callee_method;
1160 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1161 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1162 int retry_count = 0;
1163 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1164 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1165 // If has a pending exception then there is no need to re-try to
1166 // resolve this method.
1167 // If the method has been redefined, we need to try again.
1168 // Hack: we have no way to update the vtables of arrays, so don't
1169 // require that java.lang.Object has been updated.
1171 // It is very unlikely that method is redefined more than 100 times
1172 // in the middle of resolve. If it is looping here more than 100 times
1173 // means then there could be a bug here.
1174 guarantee((retry_count++ < 100),
1175 "Could not resolve to latest version of redefined method");
1176 // method is redefined in the middle of resolve so re-try.
1177 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1178 }
1179 }
1180 return callee_method;
1181 }
1183 // Resolves a call. The compilers generate code for calls that go here
1184 // and are patched with the real destination of the call.
1185 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1186 bool is_virtual,
1187 bool is_optimized, TRAPS) {
1189 ResourceMark rm(thread);
1190 RegisterMap cbl_map(thread, false);
1191 frame caller_frame = thread->last_frame().sender(&cbl_map);
1193 CodeBlob* caller_cb = caller_frame.cb();
1194 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
1195 nmethod* caller_nm = caller_cb->as_nmethod_or_null();
1197 // make sure caller is not getting deoptimized
1198 // and removed before we are done with it.
1199 // CLEANUP - with lazy deopt shouldn't need this lock
1200 nmethodLocker caller_lock(caller_nm);
1202 // determine call info & receiver
1203 // note: a) receiver is NULL for static calls
1204 // b) an exception is thrown if receiver is NULL for non-static calls
1205 CallInfo call_info;
1206 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1207 Handle receiver = find_callee_info(thread, invoke_code,
1208 call_info, CHECK_(methodHandle()));
1209 methodHandle callee_method = call_info.selected_method();
1211 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1212 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1213 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1214 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1216 assert(caller_nm->is_alive(), "It should be alive");
1218 #ifndef PRODUCT
1219 // tracing/debugging/statistics
1220 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1221 (is_virtual) ? (&_resolve_virtual_ctr) :
1222 (&_resolve_static_ctr);
1223 Atomic::inc(addr);
1225 if (TraceCallFixup) {
1226 ResourceMark rm(thread);
1227 tty->print("resolving %s%s (%s) call to",
1228 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1229 Bytecodes::name(invoke_code));
1230 callee_method->print_short_name(tty);
1231 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, caller_frame.pc(), callee_method->code());
1232 }
1233 #endif
1235 // JSR 292 key invariant:
1236 // If the resolved method is a MethodHandle invoke target, the call
1237 // site must be a MethodHandle call site, because the lambda form might tail-call
1238 // leaving the stack in a state unknown to either caller or callee
1239 // TODO detune for now but we might need it again
1240 // assert(!callee_method->is_compiled_lambda_form() ||
1241 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1243 // Compute entry points. This might require generation of C2I converter
1244 // frames, so we cannot be holding any locks here. Furthermore, the
1245 // computation of the entry points is independent of patching the call. We
1246 // always return the entry-point, but we only patch the stub if the call has
1247 // not been deoptimized. Return values: For a virtual call this is an
1248 // (cached_oop, destination address) pair. For a static call/optimized
1249 // virtual this is just a destination address.
1251 StaticCallInfo static_call_info;
1252 CompiledICInfo virtual_call_info;
1254 // Make sure the callee nmethod does not get deoptimized and removed before
1255 // we are done patching the code.
1256 nmethod* callee_nm = callee_method->code();
1257 if (callee_nm != NULL && !callee_nm->is_in_use()) {
1258 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1259 callee_nm = NULL;
1260 }
1261 nmethodLocker nl_callee(callee_nm);
1262 #ifdef ASSERT
1263 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below
1264 #endif
1266 if (is_virtual) {
1267 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1268 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1269 KlassHandle h_klass(THREAD, invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass());
1270 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1271 is_optimized, static_bound, virtual_call_info,
1272 CHECK_(methodHandle()));
1273 } else {
1274 // static call
1275 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1276 }
1278 // grab lock, check for deoptimization and potentially patch caller
1279 {
1280 MutexLocker ml_patch(CompiledIC_lock);
1282 // Lock blocks for safepoint during which both nmethods can change state.
1284 // Now that we are ready to patch if the Method* was redefined then
1285 // don't update call site and let the caller retry.
1286 // Don't update call site if callee nmethod was unloaded or deoptimized.
1287 // Don't update call site if callee nmethod was replaced by an other nmethod
1288 // which may happen when multiply alive nmethod (tiered compilation)
1289 // will be supported.
1290 if (!callee_method->is_old() &&
1291 (callee_nm == NULL || callee_nm->is_in_use() && (callee_method->code() == callee_nm))) {
1292 #ifdef ASSERT
1293 // We must not try to patch to jump to an already unloaded method.
1294 if (dest_entry_point != 0) {
1295 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1296 assert((cb != NULL) && cb->is_nmethod() && (((nmethod*)cb) == callee_nm),
1297 "should not call unloaded nmethod");
1298 }
1299 #endif
1300 if (is_virtual) {
1301 nmethod* nm = callee_nm;
1302 if (nm == NULL) CodeCache::find_blob(caller_frame.pc());
1303 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1304 if (inline_cache->is_clean()) {
1305 inline_cache->set_to_monomorphic(virtual_call_info);
1306 }
1307 } else {
1308 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1309 if (ssc->is_clean()) ssc->set(static_call_info);
1310 }
1311 }
1313 } // unlock CompiledIC_lock
1315 return callee_method;
1316 }
1319 // Inline caches exist only in compiled code
1320 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1321 #ifdef ASSERT
1322 RegisterMap reg_map(thread, false);
1323 frame stub_frame = thread->last_frame();
1324 assert(stub_frame.is_runtime_frame(), "sanity check");
1325 frame caller_frame = stub_frame.sender(®_map);
1326 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1327 #endif /* ASSERT */
1329 methodHandle callee_method;
1330 JRT_BLOCK
1331 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1332 // Return Method* through TLS
1333 thread->set_vm_result_2(callee_method());
1334 JRT_BLOCK_END
1335 // return compiled code entry point after potential safepoints
1336 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1337 return callee_method->verified_code_entry();
1338 JRT_END
1341 // Handle call site that has been made non-entrant
1342 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1343 // 6243940 We might end up in here if the callee is deoptimized
1344 // as we race to call it. We don't want to take a safepoint if
1345 // the caller was interpreted because the caller frame will look
1346 // interpreted to the stack walkers and arguments are now
1347 // "compiled" so it is much better to make this transition
1348 // invisible to the stack walking code. The i2c path will
1349 // place the callee method in the callee_target. It is stashed
1350 // there because if we try and find the callee by normal means a
1351 // safepoint is possible and have trouble gc'ing the compiled args.
1352 RegisterMap reg_map(thread, false);
1353 frame stub_frame = thread->last_frame();
1354 assert(stub_frame.is_runtime_frame(), "sanity check");
1355 frame caller_frame = stub_frame.sender(®_map);
1357 if (caller_frame.is_interpreted_frame() ||
1358 caller_frame.is_entry_frame()) {
1359 Method* callee = thread->callee_target();
1360 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1361 thread->set_vm_result_2(callee);
1362 thread->set_callee_target(NULL);
1363 return callee->get_c2i_entry();
1364 }
1366 // Must be compiled to compiled path which is safe to stackwalk
1367 methodHandle callee_method;
1368 JRT_BLOCK
1369 // Force resolving of caller (if we called from compiled frame)
1370 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1371 thread->set_vm_result_2(callee_method());
1372 JRT_BLOCK_END
1373 // return compiled code entry point after potential safepoints
1374 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1375 return callee_method->verified_code_entry();
1376 JRT_END
1378 // Handle abstract method call
1379 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1380 return StubRoutines::throw_AbstractMethodError_entry();
1381 JRT_END
1384 // resolve a static call and patch code
1385 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1386 methodHandle callee_method;
1387 JRT_BLOCK
1388 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1389 thread->set_vm_result_2(callee_method());
1390 JRT_BLOCK_END
1391 // return compiled code entry point after potential safepoints
1392 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1393 return callee_method->verified_code_entry();
1394 JRT_END
1397 // resolve virtual call and update inline cache to monomorphic
1398 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1399 methodHandle callee_method;
1400 JRT_BLOCK
1401 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1402 thread->set_vm_result_2(callee_method());
1403 JRT_BLOCK_END
1404 // return compiled code entry point after potential safepoints
1405 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1406 return callee_method->verified_code_entry();
1407 JRT_END
1410 // Resolve a virtual call that can be statically bound (e.g., always
1411 // monomorphic, so it has no inline cache). Patch code to resolved target.
1412 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1413 methodHandle callee_method;
1414 JRT_BLOCK
1415 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1416 thread->set_vm_result_2(callee_method());
1417 JRT_BLOCK_END
1418 // return compiled code entry point after potential safepoints
1419 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1420 return callee_method->verified_code_entry();
1421 JRT_END
1427 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1428 ResourceMark rm(thread);
1429 CallInfo call_info;
1430 Bytecodes::Code bc;
1432 // receiver is NULL for static calls. An exception is thrown for NULL
1433 // receivers for non-static calls
1434 Handle receiver = find_callee_info(thread, bc, call_info,
1435 CHECK_(methodHandle()));
1436 // Compiler1 can produce virtual call sites that can actually be statically bound
1437 // If we fell thru to below we would think that the site was going megamorphic
1438 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1439 // we'd try and do a vtable dispatch however methods that can be statically bound
1440 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1441 // reresolution of the call site (as if we did a handle_wrong_method and not an
1442 // plain ic_miss) and the site will be converted to an optimized virtual call site
1443 // never to miss again. I don't believe C2 will produce code like this but if it
1444 // did this would still be the correct thing to do for it too, hence no ifdef.
1445 //
1446 if (call_info.resolved_method()->can_be_statically_bound()) {
1447 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1448 if (TraceCallFixup) {
1449 RegisterMap reg_map(thread, false);
1450 frame caller_frame = thread->last_frame().sender(®_map);
1451 ResourceMark rm(thread);
1452 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1453 callee_method->print_short_name(tty);
1454 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());
1455 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1456 }
1457 return callee_method;
1458 }
1460 methodHandle callee_method = call_info.selected_method();
1462 bool should_be_mono = false;
1464 #ifndef PRODUCT
1465 Atomic::inc(&_ic_miss_ctr);
1467 // Statistics & Tracing
1468 if (TraceCallFixup) {
1469 ResourceMark rm(thread);
1470 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1471 callee_method->print_short_name(tty);
1472 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1473 }
1475 if (ICMissHistogram) {
1476 MutexLocker m(VMStatistic_lock);
1477 RegisterMap reg_map(thread, false);
1478 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1479 // produce statistics under the lock
1480 trace_ic_miss(f.pc());
1481 }
1482 #endif
1484 // install an event collector so that when a vtable stub is created the
1485 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1486 // event can't be posted when the stub is created as locks are held
1487 // - instead the event will be deferred until the event collector goes
1488 // out of scope.
1489 JvmtiDynamicCodeEventCollector event_collector;
1491 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1492 { MutexLocker ml_patch (CompiledIC_lock);
1493 RegisterMap reg_map(thread, false);
1494 frame caller_frame = thread->last_frame().sender(®_map);
1495 CodeBlob* cb = caller_frame.cb();
1496 if (cb->is_nmethod()) {
1497 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc());
1498 bool should_be_mono = false;
1499 if (inline_cache->is_optimized()) {
1500 if (TraceCallFixup) {
1501 ResourceMark rm(thread);
1502 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1503 callee_method->print_short_name(tty);
1504 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1505 }
1506 should_be_mono = true;
1507 } else if (inline_cache->is_icholder_call()) {
1508 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1509 if ( ic_oop != NULL) {
1511 if (receiver()->klass() == ic_oop->holder_klass()) {
1512 // This isn't a real miss. We must have seen that compiled code
1513 // is now available and we want the call site converted to a
1514 // monomorphic compiled call site.
1515 // We can't assert for callee_method->code() != NULL because it
1516 // could have been deoptimized in the meantime
1517 if (TraceCallFixup) {
1518 ResourceMark rm(thread);
1519 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1520 callee_method->print_short_name(tty);
1521 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1522 }
1523 should_be_mono = true;
1524 }
1525 }
1526 }
1528 if (should_be_mono) {
1530 // We have a path that was monomorphic but was going interpreted
1531 // and now we have (or had) a compiled entry. We correct the IC
1532 // by using a new icBuffer.
1533 CompiledICInfo info;
1534 KlassHandle receiver_klass(THREAD, receiver()->klass());
1535 inline_cache->compute_monomorphic_entry(callee_method,
1536 receiver_klass,
1537 inline_cache->is_optimized(),
1538 false,
1539 info, CHECK_(methodHandle()));
1540 inline_cache->set_to_monomorphic(info);
1541 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1542 // Potential change to megamorphic
1543 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1544 if (!successful) {
1545 inline_cache->set_to_clean();
1546 }
1547 } else {
1548 // Either clean or megamorphic
1549 }
1550 }
1551 } // Release CompiledIC_lock
1553 return callee_method;
1554 }
1556 //
1557 // Resets a call-site in compiled code so it will get resolved again.
1558 // This routines handles both virtual call sites, optimized virtual call
1559 // sites, and static call sites. Typically used to change a call sites
1560 // destination from compiled to interpreted.
1561 //
1562 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1563 ResourceMark rm(thread);
1564 RegisterMap reg_map(thread, false);
1565 frame stub_frame = thread->last_frame();
1566 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1567 frame caller = stub_frame.sender(®_map);
1569 // Do nothing if the frame isn't a live compiled frame.
1570 // nmethod could be deoptimized by the time we get here
1571 // so no update to the caller is needed.
1573 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1575 address pc = caller.pc();
1577 // Default call_addr is the location of the "basic" call.
1578 // Determine the address of the call we a reresolving. With
1579 // Inline Caches we will always find a recognizable call.
1580 // With Inline Caches disabled we may or may not find a
1581 // recognizable call. We will always find a call for static
1582 // calls and for optimized virtual calls. For vanilla virtual
1583 // calls it depends on the state of the UseInlineCaches switch.
1584 //
1585 // With Inline Caches disabled we can get here for a virtual call
1586 // for two reasons:
1587 // 1 - calling an abstract method. The vtable for abstract methods
1588 // will run us thru handle_wrong_method and we will eventually
1589 // end up in the interpreter to throw the ame.
1590 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1591 // call and between the time we fetch the entry address and
1592 // we jump to it the target gets deoptimized. Similar to 1
1593 // we will wind up in the interprter (thru a c2i with c2).
1594 //
1595 address call_addr = NULL;
1596 {
1597 // Get call instruction under lock because another thread may be
1598 // busy patching it.
1599 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1600 // Location of call instruction
1601 if (NativeCall::is_call_before(pc)) {
1602 NativeCall *ncall = nativeCall_before(pc);
1603 call_addr = ncall->instruction_address();
1604 }
1605 }
1607 // Check for static or virtual call
1608 bool is_static_call = false;
1609 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1610 // Make sure nmethod doesn't get deoptimized and removed until
1611 // this is done with it.
1612 // CLEANUP - with lazy deopt shouldn't need this lock
1613 nmethodLocker nmlock(caller_nm);
1615 if (call_addr != NULL) {
1616 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1617 int ret = iter.next(); // Get item
1618 if (ret) {
1619 assert(iter.addr() == call_addr, "must find call");
1620 if (iter.type() == relocInfo::static_call_type) {
1621 is_static_call = true;
1622 } else {
1623 assert(iter.type() == relocInfo::virtual_call_type ||
1624 iter.type() == relocInfo::opt_virtual_call_type
1625 , "unexpected relocInfo. type");
1626 }
1627 } else {
1628 assert(!UseInlineCaches, "relocation info. must exist for this address");
1629 }
1631 // Cleaning the inline cache will force a new resolve. This is more robust
1632 // than directly setting it to the new destination, since resolving of calls
1633 // is always done through the same code path. (experience shows that it
1634 // leads to very hard to track down bugs, if an inline cache gets updated
1635 // to a wrong method). It should not be performance critical, since the
1636 // resolve is only done once.
1638 MutexLocker ml(CompiledIC_lock);
1639 if (is_static_call) {
1640 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1641 ssc->set_to_clean();
1642 } else {
1643 // compiled, dispatched call (which used to call an interpreted method)
1644 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1645 inline_cache->set_to_clean();
1646 }
1647 }
1649 }
1651 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1654 #ifndef PRODUCT
1655 Atomic::inc(&_wrong_method_ctr);
1657 if (TraceCallFixup) {
1658 ResourceMark rm(thread);
1659 tty->print("handle_wrong_method reresolving call to");
1660 callee_method->print_short_name(tty);
1661 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1662 }
1663 #endif
1665 return callee_method;
1666 }
1668 #ifdef ASSERT
1669 void SharedRuntime::check_member_name_argument_is_last_argument(methodHandle method,
1670 const BasicType* sig_bt,
1671 const VMRegPair* regs) {
1672 ResourceMark rm;
1673 const int total_args_passed = method->size_of_parameters();
1674 const VMRegPair* regs_with_member_name = regs;
1675 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1677 const int member_arg_pos = total_args_passed - 1;
1678 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1679 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1681 const bool is_outgoing = method->is_method_handle_intrinsic();
1682 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1684 for (int i = 0; i < member_arg_pos; i++) {
1685 VMReg a = regs_with_member_name[i].first();
1686 VMReg b = regs_without_member_name[i].first();
1687 assert(a->value() == b->value(), err_msg_res("register allocation mismatch: a=%d, b=%d", a->value(), b->value()));
1688 }
1689 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1690 }
1691 #endif
1693 // ---------------------------------------------------------------------------
1694 // We are calling the interpreter via a c2i. Normally this would mean that
1695 // we were called by a compiled method. However we could have lost a race
1696 // where we went int -> i2c -> c2i and so the caller could in fact be
1697 // interpreted. If the caller is compiled we attempt to patch the caller
1698 // so he no longer calls into the interpreter.
1699 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1700 Method* moop(method);
1702 address entry_point = moop->from_compiled_entry();
1704 // It's possible that deoptimization can occur at a call site which hasn't
1705 // been resolved yet, in which case this function will be called from
1706 // an nmethod that has been patched for deopt and we can ignore the
1707 // request for a fixup.
1708 // Also it is possible that we lost a race in that from_compiled_entry
1709 // is now back to the i2c in that case we don't need to patch and if
1710 // we did we'd leap into space because the callsite needs to use
1711 // "to interpreter" stub in order to load up the Method*. Don't
1712 // ask me how I know this...
1714 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1715 if (cb == NULL || !cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1716 return;
1717 }
1719 // The check above makes sure this is a nmethod.
1720 nmethod* nm = cb->as_nmethod_or_null();
1721 assert(nm, "must be");
1723 // Get the return PC for the passed caller PC.
1724 address return_pc = caller_pc + frame::pc_return_offset;
1726 // There is a benign race here. We could be attempting to patch to a compiled
1727 // entry point at the same time the callee is being deoptimized. If that is
1728 // the case then entry_point may in fact point to a c2i and we'd patch the
1729 // call site with the same old data. clear_code will set code() to NULL
1730 // at the end of it. If we happen to see that NULL then we can skip trying
1731 // to patch. If we hit the window where the callee has a c2i in the
1732 // from_compiled_entry and the NULL isn't present yet then we lose the race
1733 // and patch the code with the same old data. Asi es la vida.
1735 if (moop->code() == NULL) return;
1737 if (nm->is_in_use()) {
1739 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1740 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1741 if (NativeCall::is_call_before(return_pc)) {
1742 NativeCall *call = nativeCall_before(return_pc);
1743 //
1744 // bug 6281185. We might get here after resolving a call site to a vanilla
1745 // virtual call. Because the resolvee uses the verified entry it may then
1746 // see compiled code and attempt to patch the site by calling us. This would
1747 // then incorrectly convert the call site to optimized and its downhill from
1748 // there. If you're lucky you'll get the assert in the bugid, if not you've
1749 // just made a call site that could be megamorphic into a monomorphic site
1750 // for the rest of its life! Just another racing bug in the life of
1751 // fixup_callers_callsite ...
1752 //
1753 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1754 iter.next();
1755 assert(iter.has_current(), "must have a reloc at java call site");
1756 relocInfo::relocType typ = iter.reloc()->type();
1757 if ( typ != relocInfo::static_call_type &&
1758 typ != relocInfo::opt_virtual_call_type &&
1759 typ != relocInfo::static_stub_type) {
1760 return;
1761 }
1762 address destination = call->destination();
1763 if (destination != entry_point) {
1764 CodeBlob* callee = CodeCache::find_blob(destination);
1765 // callee == cb seems weird. It means calling interpreter thru stub.
1766 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) {
1767 // static call or optimized virtual
1768 if (TraceCallFixup) {
1769 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1770 moop->print_short_name(tty);
1771 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1772 }
1773 call->set_destination_mt_safe(entry_point);
1774 } else {
1775 if (TraceCallFixup) {
1776 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1777 moop->print_short_name(tty);
1778 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1779 }
1780 // assert is too strong could also be resolve destinations.
1781 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1782 }
1783 } else {
1784 if (TraceCallFixup) {
1785 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1786 moop->print_short_name(tty);
1787 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1788 }
1789 }
1790 }
1791 }
1792 IRT_END
1795 // same as JVM_Arraycopy, but called directly from compiled code
1796 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1797 oopDesc* dest, jint dest_pos,
1798 jint length,
1799 JavaThread* thread)) {
1800 #ifndef PRODUCT
1801 _slow_array_copy_ctr++;
1802 #endif
1803 // Check if we have null pointers
1804 if (src == NULL || dest == NULL) {
1805 THROW(vmSymbols::java_lang_NullPointerException());
1806 }
1807 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1808 // even though the copy_array API also performs dynamic checks to ensure
1809 // that src and dest are truly arrays (and are conformable).
1810 // The copy_array mechanism is awkward and could be removed, but
1811 // the compilers don't call this function except as a last resort,
1812 // so it probably doesn't matter.
1813 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1814 (arrayOopDesc*)dest, dest_pos,
1815 length, thread);
1816 }
1817 JRT_END
1819 char* SharedRuntime::generate_class_cast_message(
1820 JavaThread* thread, const char* objName) {
1822 // Get target class name from the checkcast instruction
1823 vframeStream vfst(thread, true);
1824 assert(!vfst.at_end(), "Java frame must exist");
1825 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1826 Klass* targetKlass = vfst.method()->constants()->klass_at(
1827 cc.index(), thread);
1828 return generate_class_cast_message(objName, targetKlass->external_name());
1829 }
1831 char* SharedRuntime::generate_class_cast_message(
1832 const char* objName, const char* targetKlassName, const char* desc) {
1833 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1835 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1836 if (NULL == message) {
1837 // Shouldn't happen, but don't cause even more problems if it does
1838 message = const_cast<char*>(objName);
1839 } else {
1840 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1841 }
1842 return message;
1843 }
1845 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1846 (void) JavaThread::current()->reguard_stack();
1847 JRT_END
1850 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1851 #ifndef PRODUCT
1852 int SharedRuntime::_monitor_enter_ctr=0;
1853 #endif
1854 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1855 oop obj(_obj);
1856 #ifndef PRODUCT
1857 _monitor_enter_ctr++; // monitor enter slow
1858 #endif
1859 if (PrintBiasedLockingStatistics) {
1860 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1861 }
1862 Handle h_obj(THREAD, obj);
1863 if (UseBiasedLocking) {
1864 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1865 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1866 } else {
1867 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1868 }
1869 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1870 JRT_END
1872 #ifndef PRODUCT
1873 int SharedRuntime::_monitor_exit_ctr=0;
1874 #endif
1875 // Handles the uncommon cases of monitor unlocking in compiled code
1876 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))
1877 oop obj(_obj);
1878 #ifndef PRODUCT
1879 _monitor_exit_ctr++; // monitor exit slow
1880 #endif
1881 Thread* THREAD = JavaThread::current();
1882 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1883 // testing was unable to ever fire the assert that guarded it so I have removed it.
1884 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1885 #undef MIGHT_HAVE_PENDING
1886 #ifdef MIGHT_HAVE_PENDING
1887 // Save and restore any pending_exception around the exception mark.
1888 // While the slow_exit must not throw an exception, we could come into
1889 // this routine with one set.
1890 oop pending_excep = NULL;
1891 const char* pending_file;
1892 int pending_line;
1893 if (HAS_PENDING_EXCEPTION) {
1894 pending_excep = PENDING_EXCEPTION;
1895 pending_file = THREAD->exception_file();
1896 pending_line = THREAD->exception_line();
1897 CLEAR_PENDING_EXCEPTION;
1898 }
1899 #endif /* MIGHT_HAVE_PENDING */
1901 {
1902 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1903 EXCEPTION_MARK;
1904 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
1905 }
1907 #ifdef MIGHT_HAVE_PENDING
1908 if (pending_excep != NULL) {
1909 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
1910 }
1911 #endif /* MIGHT_HAVE_PENDING */
1912 JRT_END
1914 #ifndef PRODUCT
1916 void SharedRuntime::print_statistics() {
1917 ttyLocker ttyl;
1918 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
1920 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr);
1921 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr);
1922 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
1924 SharedRuntime::print_ic_miss_histogram();
1926 if (CountRemovableExceptions) {
1927 if (_nof_removable_exceptions > 0) {
1928 Unimplemented(); // this counter is not yet incremented
1929 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
1930 }
1931 }
1933 // Dump the JRT_ENTRY counters
1934 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
1935 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);
1936 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
1937 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
1938 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
1939 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
1940 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
1942 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );
1943 tty->print_cr("%5d wrong method", _wrong_method_ctr );
1944 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );
1945 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );
1946 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );
1948 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );
1949 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );
1950 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );
1951 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );
1952 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );
1953 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );
1954 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );
1955 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );
1956 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );
1957 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );
1958 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );
1959 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );
1960 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );
1961 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );
1962 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );
1963 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );
1965 AdapterHandlerLibrary::print_statistics();
1967 if (xtty != NULL) xtty->tail("statistics");
1968 }
1970 inline double percent(int x, int y) {
1971 return 100.0 * x / MAX2(y, 1);
1972 }
1974 class MethodArityHistogram {
1975 public:
1976 enum { MAX_ARITY = 256 };
1977 private:
1978 static int _arity_histogram[MAX_ARITY]; // histogram of #args
1979 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
1980 static int _max_arity; // max. arity seen
1981 static int _max_size; // max. arg size seen
1983 static void add_method_to_histogram(nmethod* nm) {
1984 Method* m = nm->method();
1985 ArgumentCount args(m->signature());
1986 int arity = args.size() + (m->is_static() ? 0 : 1);
1987 int argsize = m->size_of_parameters();
1988 arity = MIN2(arity, MAX_ARITY-1);
1989 argsize = MIN2(argsize, MAX_ARITY-1);
1990 int count = nm->method()->compiled_invocation_count();
1991 _arity_histogram[arity] += count;
1992 _size_histogram[argsize] += count;
1993 _max_arity = MAX2(_max_arity, arity);
1994 _max_size = MAX2(_max_size, argsize);
1995 }
1997 void print_histogram_helper(int n, int* histo, const char* name) {
1998 const int N = MIN2(5, n);
1999 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2000 double sum = 0;
2001 double weighted_sum = 0;
2002 int i;
2003 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2004 double rest = sum;
2005 double percent = sum / 100;
2006 for (i = 0; i <= N; i++) {
2007 rest -= histo[i];
2008 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2009 }
2010 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2011 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2012 }
2014 void print_histogram() {
2015 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2016 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2017 tty->print_cr("\nSame for parameter size (in words):");
2018 print_histogram_helper(_max_size, _size_histogram, "size");
2019 tty->cr();
2020 }
2022 public:
2023 MethodArityHistogram() {
2024 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2025 _max_arity = _max_size = 0;
2026 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;
2027 CodeCache::nmethods_do(add_method_to_histogram);
2028 print_histogram();
2029 }
2030 };
2032 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2033 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2034 int MethodArityHistogram::_max_arity;
2035 int MethodArityHistogram::_max_size;
2037 void SharedRuntime::print_call_statistics(int comp_total) {
2038 tty->print_cr("Calls from compiled code:");
2039 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2040 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2041 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2042 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2043 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2044 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2045 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2046 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2047 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2048 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2049 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2050 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2051 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2052 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2053 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2054 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2055 tty->cr();
2056 tty->print_cr("Note 1: counter updates are not MT-safe.");
2057 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2058 tty->print_cr(" %% in nested categories are relative to their category");
2059 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2060 tty->cr();
2062 MethodArityHistogram h;
2063 }
2064 #endif
2067 // A simple wrapper class around the calling convention information
2068 // that allows sharing of adapters for the same calling convention.
2069 class AdapterFingerPrint : public CHeapObj<mtCode> {
2070 private:
2071 enum {
2072 _basic_type_bits = 4,
2073 _basic_type_mask = right_n_bits(_basic_type_bits),
2074 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2075 _compact_int_count = 3
2076 };
2077 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2078 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2080 union {
2081 int _compact[_compact_int_count];
2082 int* _fingerprint;
2083 } _value;
2084 int _length; // A negative length indicates the fingerprint is in the compact form,
2085 // Otherwise _value._fingerprint is the array.
2087 // Remap BasicTypes that are handled equivalently by the adapters.
2088 // These are correct for the current system but someday it might be
2089 // necessary to make this mapping platform dependent.
2090 static int adapter_encoding(BasicType in) {
2091 switch(in) {
2092 case T_BOOLEAN:
2093 case T_BYTE:
2094 case T_SHORT:
2095 case T_CHAR:
2096 // There are all promoted to T_INT in the calling convention
2097 return T_INT;
2099 case T_OBJECT:
2100 case T_ARRAY:
2101 // In other words, we assume that any register good enough for
2102 // an int or long is good enough for a managed pointer.
2103 #ifdef _LP64
2104 return T_LONG;
2105 #else
2106 return T_INT;
2107 #endif
2109 case T_INT:
2110 case T_LONG:
2111 case T_FLOAT:
2112 case T_DOUBLE:
2113 case T_VOID:
2114 return in;
2116 default:
2117 ShouldNotReachHere();
2118 return T_CONFLICT;
2119 }
2120 }
2122 public:
2123 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2124 // The fingerprint is based on the BasicType signature encoded
2125 // into an array of ints with eight entries per int.
2126 int* ptr;
2127 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2128 if (len <= _compact_int_count) {
2129 assert(_compact_int_count == 3, "else change next line");
2130 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2131 // Storing the signature encoded as signed chars hits about 98%
2132 // of the time.
2133 _length = -len;
2134 ptr = _value._compact;
2135 } else {
2136 _length = len;
2137 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2138 ptr = _value._fingerprint;
2139 }
2141 // Now pack the BasicTypes with 8 per int
2142 int sig_index = 0;
2143 for (int index = 0; index < len; index++) {
2144 int value = 0;
2145 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2146 int bt = ((sig_index < total_args_passed)
2147 ? adapter_encoding(sig_bt[sig_index++])
2148 : 0);
2149 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2150 value = (value << _basic_type_bits) | bt;
2151 }
2152 ptr[index] = value;
2153 }
2154 }
2156 ~AdapterFingerPrint() {
2157 if (_length > 0) {
2158 FREE_C_HEAP_ARRAY(int, _value._fingerprint, mtCode);
2159 }
2160 }
2162 int value(int index) {
2163 if (_length < 0) {
2164 return _value._compact[index];
2165 }
2166 return _value._fingerprint[index];
2167 }
2168 int length() {
2169 if (_length < 0) return -_length;
2170 return _length;
2171 }
2173 bool is_compact() {
2174 return _length <= 0;
2175 }
2177 unsigned int compute_hash() {
2178 int hash = 0;
2179 for (int i = 0; i < length(); i++) {
2180 int v = value(i);
2181 hash = (hash << 8) ^ v ^ (hash >> 5);
2182 }
2183 return (unsigned int)hash;
2184 }
2186 const char* as_string() {
2187 stringStream st;
2188 st.print("0x");
2189 for (int i = 0; i < length(); i++) {
2190 st.print("%08x", value(i));
2191 }
2192 return st.as_string();
2193 }
2195 bool equals(AdapterFingerPrint* other) {
2196 if (other->_length != _length) {
2197 return false;
2198 }
2199 if (_length < 0) {
2200 assert(_compact_int_count == 3, "else change next line");
2201 return _value._compact[0] == other->_value._compact[0] &&
2202 _value._compact[1] == other->_value._compact[1] &&
2203 _value._compact[2] == other->_value._compact[2];
2204 } else {
2205 for (int i = 0; i < _length; i++) {
2206 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2207 return false;
2208 }
2209 }
2210 }
2211 return true;
2212 }
2213 };
2216 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2217 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2218 friend class AdapterHandlerTableIterator;
2220 private:
2222 #ifndef PRODUCT
2223 static int _lookups; // number of calls to lookup
2224 static int _buckets; // number of buckets checked
2225 static int _equals; // number of buckets checked with matching hash
2226 static int _hits; // number of successful lookups
2227 static int _compact; // number of equals calls with compact signature
2228 #endif
2230 AdapterHandlerEntry* bucket(int i) {
2231 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2232 }
2234 public:
2235 AdapterHandlerTable()
2236 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { }
2238 // Create a new entry suitable for insertion in the table
2239 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2240 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2241 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2242 return entry;
2243 }
2245 // Insert an entry into the table
2246 void add(AdapterHandlerEntry* entry) {
2247 int index = hash_to_index(entry->hash());
2248 add_entry(index, entry);
2249 }
2251 void free_entry(AdapterHandlerEntry* entry) {
2252 entry->deallocate();
2253 BasicHashtable<mtCode>::free_entry(entry);
2254 }
2256 // Find a entry with the same fingerprint if it exists
2257 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2258 NOT_PRODUCT(_lookups++);
2259 AdapterFingerPrint fp(total_args_passed, sig_bt);
2260 unsigned int hash = fp.compute_hash();
2261 int index = hash_to_index(hash);
2262 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2263 NOT_PRODUCT(_buckets++);
2264 if (e->hash() == hash) {
2265 NOT_PRODUCT(_equals++);
2266 if (fp.equals(e->fingerprint())) {
2267 #ifndef PRODUCT
2268 if (fp.is_compact()) _compact++;
2269 _hits++;
2270 #endif
2271 return e;
2272 }
2273 }
2274 }
2275 return NULL;
2276 }
2278 #ifndef PRODUCT
2279 void print_statistics() {
2280 ResourceMark rm;
2281 int longest = 0;
2282 int empty = 0;
2283 int total = 0;
2284 int nonempty = 0;
2285 for (int index = 0; index < table_size(); index++) {
2286 int count = 0;
2287 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2288 count++;
2289 }
2290 if (count != 0) nonempty++;
2291 if (count == 0) empty++;
2292 if (count > longest) longest = count;
2293 total += count;
2294 }
2295 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2296 empty, longest, total, total / (double)nonempty);
2297 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2298 _lookups, _buckets, _equals, _hits, _compact);
2299 }
2300 #endif
2301 };
2304 #ifndef PRODUCT
2306 int AdapterHandlerTable::_lookups;
2307 int AdapterHandlerTable::_buckets;
2308 int AdapterHandlerTable::_equals;
2309 int AdapterHandlerTable::_hits;
2310 int AdapterHandlerTable::_compact;
2312 #endif
2314 class AdapterHandlerTableIterator : public StackObj {
2315 private:
2316 AdapterHandlerTable* _table;
2317 int _index;
2318 AdapterHandlerEntry* _current;
2320 void scan() {
2321 while (_index < _table->table_size()) {
2322 AdapterHandlerEntry* a = _table->bucket(_index);
2323 _index++;
2324 if (a != NULL) {
2325 _current = a;
2326 return;
2327 }
2328 }
2329 }
2331 public:
2332 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2333 scan();
2334 }
2335 bool has_next() {
2336 return _current != NULL;
2337 }
2338 AdapterHandlerEntry* next() {
2339 if (_current != NULL) {
2340 AdapterHandlerEntry* result = _current;
2341 _current = _current->next();
2342 if (_current == NULL) scan();
2343 return result;
2344 } else {
2345 return NULL;
2346 }
2347 }
2348 };
2351 // ---------------------------------------------------------------------------
2352 // Implementation of AdapterHandlerLibrary
2353 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2354 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2355 const int AdapterHandlerLibrary_size = 16*K;
2356 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2358 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2359 // Should be called only when AdapterHandlerLibrary_lock is active.
2360 if (_buffer == NULL) // Initialize lazily
2361 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2362 return _buffer;
2363 }
2365 void AdapterHandlerLibrary::initialize() {
2366 if (_adapters != NULL) return;
2367 _adapters = new AdapterHandlerTable();
2369 // Create a special handler for abstract methods. Abstract methods
2370 // are never compiled so an i2c entry is somewhat meaningless, but
2371 // throw AbstractMethodError just in case.
2372 // Pass wrong_method_abstract for the c2i transitions to return
2373 // AbstractMethodError for invalid invocations.
2374 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2375 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2376 StubRoutines::throw_AbstractMethodError_entry(),
2377 wrong_method_abstract, wrong_method_abstract);
2378 }
2380 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2381 address i2c_entry,
2382 address c2i_entry,
2383 address c2i_unverified_entry) {
2384 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2385 }
2387 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) {
2388 // Use customized signature handler. Need to lock around updates to
2389 // the AdapterHandlerTable (it is not safe for concurrent readers
2390 // and a single writer: this could be fixed if it becomes a
2391 // problem).
2393 // Get the address of the ic_miss handlers before we grab the
2394 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which
2395 // was caused by the initialization of the stubs happening
2396 // while we held the lock and then notifying jvmti while
2397 // holding it. This just forces the initialization to be a little
2398 // earlier.
2399 address ic_miss = SharedRuntime::get_ic_miss_stub();
2400 assert(ic_miss != NULL, "must have handler");
2402 ResourceMark rm;
2404 NOT_PRODUCT(int insts_size);
2405 AdapterBlob* new_adapter = NULL;
2406 AdapterHandlerEntry* entry = NULL;
2407 AdapterFingerPrint* fingerprint = NULL;
2408 {
2409 MutexLocker mu(AdapterHandlerLibrary_lock);
2410 // make sure data structure is initialized
2411 initialize();
2413 if (method->is_abstract()) {
2414 return _abstract_method_handler;
2415 }
2417 // Fill in the signature array, for the calling-convention call.
2418 int total_args_passed = method->size_of_parameters(); // All args on stack
2420 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2421 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2422 int i = 0;
2423 if (!method->is_static()) // Pass in receiver first
2424 sig_bt[i++] = T_OBJECT;
2425 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2426 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2427 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2428 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2429 }
2430 assert(i == total_args_passed, "");
2432 // Lookup method signature's fingerprint
2433 entry = _adapters->lookup(total_args_passed, sig_bt);
2435 #ifdef ASSERT
2436 AdapterHandlerEntry* shared_entry = NULL;
2437 // Start adapter sharing verification only after the VM is booted.
2438 if (VerifyAdapterSharing && (entry != NULL)) {
2439 shared_entry = entry;
2440 entry = NULL;
2441 }
2442 #endif
2444 if (entry != NULL) {
2445 return entry;
2446 }
2448 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2449 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2451 // Make a C heap allocated version of the fingerprint to store in the adapter
2452 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2454 // StubRoutines::code2() is initialized after this function can be called. As a result,
2455 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2456 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2457 // stub that ensure that an I2C stub is called from an interpreter frame.
2458 bool contains_all_checks = StubRoutines::code2() != NULL;
2460 // Create I2C & C2I handlers
2461 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2462 if (buf != NULL) {
2463 CodeBuffer buffer(buf);
2464 short buffer_locs[20];
2465 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2466 sizeof(buffer_locs)/sizeof(relocInfo));
2468 MacroAssembler _masm(&buffer);
2469 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2470 total_args_passed,
2471 comp_args_on_stack,
2472 sig_bt,
2473 regs,
2474 fingerprint);
2475 #ifdef ASSERT
2476 if (VerifyAdapterSharing) {
2477 if (shared_entry != NULL) {
2478 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2479 // Release the one just created and return the original
2480 _adapters->free_entry(entry);
2481 return shared_entry;
2482 } else {
2483 entry->save_code(buf->code_begin(), buffer.insts_size());
2484 }
2485 }
2486 #endif
2488 new_adapter = AdapterBlob::create(&buffer);
2489 NOT_PRODUCT(insts_size = buffer.insts_size());
2490 }
2491 if (new_adapter == NULL) {
2492 // CodeCache is full, disable compilation
2493 // Ought to log this but compile log is only per compile thread
2494 // and we're some non descript Java thread.
2495 MutexUnlocker mu(AdapterHandlerLibrary_lock);
2496 CompileBroker::handle_full_code_cache();
2497 return NULL; // Out of CodeCache space
2498 }
2499 entry->relocate(new_adapter->content_begin());
2500 #ifndef PRODUCT
2501 // debugging suppport
2502 if (PrintAdapterHandlers || PrintStubCode) {
2503 ttyLocker ttyl;
2504 entry->print_adapter_on(tty);
2505 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2506 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2507 method->signature()->as_C_string(), insts_size);
2508 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
2509 if (Verbose || PrintStubCode) {
2510 address first_pc = entry->base_address();
2511 if (first_pc != NULL) {
2512 Disassembler::decode(first_pc, first_pc + insts_size);
2513 tty->cr();
2514 }
2515 }
2516 }
2517 #endif
2518 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2519 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2520 if (contains_all_checks || !VerifyAdapterCalls) {
2521 _adapters->add(entry);
2522 }
2523 }
2524 // Outside of the lock
2525 if (new_adapter != NULL) {
2526 char blob_id[256];
2527 jio_snprintf(blob_id,
2528 sizeof(blob_id),
2529 "%s(%s)@" PTR_FORMAT,
2530 new_adapter->name(),
2531 fingerprint->as_string(),
2532 new_adapter->content_begin());
2533 Forte::register_stub(blob_id, new_adapter->content_begin(),new_adapter->content_end());
2535 if (JvmtiExport::should_post_dynamic_code_generated()) {
2536 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2537 }
2538 }
2539 return entry;
2540 }
2542 address AdapterHandlerEntry::base_address() {
2543 address base = _i2c_entry;
2544 if (base == NULL) base = _c2i_entry;
2545 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2546 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2547 return base;
2548 }
2550 void AdapterHandlerEntry::relocate(address new_base) {
2551 address old_base = base_address();
2552 assert(old_base != NULL, "");
2553 ptrdiff_t delta = new_base - old_base;
2554 if (_i2c_entry != NULL)
2555 _i2c_entry += delta;
2556 if (_c2i_entry != NULL)
2557 _c2i_entry += delta;
2558 if (_c2i_unverified_entry != NULL)
2559 _c2i_unverified_entry += delta;
2560 assert(base_address() == new_base, "");
2561 }
2564 void AdapterHandlerEntry::deallocate() {
2565 delete _fingerprint;
2566 #ifdef ASSERT
2567 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code, mtCode);
2568 #endif
2569 }
2572 #ifdef ASSERT
2573 // Capture the code before relocation so that it can be compared
2574 // against other versions. If the code is captured after relocation
2575 // then relative instructions won't be equivalent.
2576 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2577 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2578 _saved_code_length = length;
2579 memcpy(_saved_code, buffer, length);
2580 }
2583 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2584 if (length != _saved_code_length) {
2585 return false;
2586 }
2588 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2589 }
2590 #endif
2593 /**
2594 * Create a native wrapper for this native method. The wrapper converts the
2595 * Java-compiled calling convention to the native convention, handles
2596 * arguments, and transitions to native. On return from the native we transition
2597 * back to java blocking if a safepoint is in progress.
2598 */
2599 void AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {
2600 ResourceMark rm;
2601 nmethod* nm = NULL;
2603 assert(method->is_native(), "must be native");
2604 assert(method->is_method_handle_intrinsic() ||
2605 method->has_native_function(), "must have something valid to call!");
2607 {
2608 // Perform the work while holding the lock, but perform any printing outside the lock
2609 MutexLocker mu(AdapterHandlerLibrary_lock);
2610 // See if somebody beat us to it
2611 nm = method->code();
2612 if (nm != NULL) {
2613 return;
2614 }
2616 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2617 assert(compile_id > 0, "Must generate native wrapper");
2620 ResourceMark rm;
2621 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2622 if (buf != NULL) {
2623 CodeBuffer buffer(buf);
2624 double locs_buf[20];
2625 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2626 MacroAssembler _masm(&buffer);
2628 // Fill in the signature array, for the calling-convention call.
2629 const int total_args_passed = method->size_of_parameters();
2631 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2632 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2633 int i=0;
2634 if( !method->is_static() ) // Pass in receiver first
2635 sig_bt[i++] = T_OBJECT;
2636 SignatureStream ss(method->signature());
2637 for( ; !ss.at_return_type(); ss.next()) {
2638 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2639 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2640 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2641 }
2642 assert(i == total_args_passed, "");
2643 BasicType ret_type = ss.type();
2645 // Now get the compiled-Java layout as input (or output) arguments.
2646 // NOTE: Stubs for compiled entry points of method handle intrinsics
2647 // are just trampolines so the argument registers must be outgoing ones.
2648 const bool is_outgoing = method->is_method_handle_intrinsic();
2649 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2651 // Generate the compiled-to-native wrapper code
2652 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2654 if (nm != NULL) {
2655 method->set_code(method, nm);
2656 }
2657 }
2658 } // Unlock AdapterHandlerLibrary_lock
2661 // Install the generated code.
2662 if (nm != NULL) {
2663 if (PrintCompilation) {
2664 ttyLocker ttyl;
2665 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2666 }
2667 nm->post_compiled_method_load_event();
2668 } else {
2669 // CodeCache is full, disable compilation
2670 CompileBroker::handle_full_code_cache();
2671 }
2672 }
2674 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2675 assert(thread == JavaThread::current(), "must be");
2676 // The code is about to enter a JNI lazy critical native method and
2677 // _needs_gc is true, so if this thread is already in a critical
2678 // section then just return, otherwise this thread should block
2679 // until needs_gc has been cleared.
2680 if (thread->in_critical()) {
2681 return;
2682 }
2683 // Lock and unlock a critical section to give the system a chance to block
2684 GC_locker::lock_critical(thread);
2685 GC_locker::unlock_critical(thread);
2686 JRT_END
2688 #ifdef HAVE_DTRACE_H
2689 /**
2690 * Create a dtrace nmethod for this method. The wrapper converts the
2691 * Java-compiled calling convention to the native convention, makes a dummy call
2692 * (actually nops for the size of the call instruction, which become a trap if
2693 * probe is enabled), and finally returns to the caller. Since this all looks like a
2694 * leaf, no thread transition is needed.
2695 */
2696 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
2697 ResourceMark rm;
2698 nmethod* nm = NULL;
2700 if (PrintCompilation) {
2701 ttyLocker ttyl;
2702 tty->print("--- n ");
2703 method->print_short_name(tty);
2704 if (method->is_static()) {
2705 tty->print(" (static)");
2706 }
2707 tty->cr();
2708 }
2710 {
2711 // perform the work while holding the lock, but perform any printing
2712 // outside the lock
2713 MutexLocker mu(AdapterHandlerLibrary_lock);
2714 // See if somebody beat us to it
2715 nm = method->code();
2716 if (nm) {
2717 return nm;
2718 }
2720 ResourceMark rm;
2722 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2723 if (buf != NULL) {
2724 CodeBuffer buffer(buf);
2725 // Need a few relocation entries
2726 double locs_buf[20];
2727 buffer.insts()->initialize_shared_locs(
2728 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2729 MacroAssembler _masm(&buffer);
2731 // Generate the compiled-to-native wrapper code
2732 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
2733 }
2734 }
2735 return nm;
2736 }
2738 // the dtrace method needs to convert java lang string to utf8 string.
2739 void SharedRuntime::get_utf(oopDesc* src, address dst) {
2740 typeArrayOop jlsValue = java_lang_String::value(src);
2741 int jlsOffset = java_lang_String::offset(src);
2742 int jlsLen = java_lang_String::length(src);
2743 jchar* jlsPos = (jlsLen == 0) ? NULL :
2744 jlsValue->char_at_addr(jlsOffset);
2745 assert(TypeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string");
2746 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
2747 }
2748 #endif // ndef HAVE_DTRACE_H
2750 int SharedRuntime::convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt) {
2751 int argcnt = in_args_count;
2752 if (CCallingConventionRequiresIntsAsLongs) {
2753 for (int in = 0; in < in_args_count; in++) {
2754 BasicType bt = in_sig_bt[in];
2755 switch (bt) {
2756 case T_BOOLEAN:
2757 case T_CHAR:
2758 case T_BYTE:
2759 case T_SHORT:
2760 case T_INT:
2761 argcnt++;
2762 break;
2763 default:
2764 break;
2765 }
2766 }
2767 } else {
2768 assert(0, "This should not be needed on this platform");
2769 }
2771 return argcnt;
2772 }
2774 void SharedRuntime::convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
2775 BasicType*& in_sig_bt, VMRegPair*& in_regs) {
2776 if (CCallingConventionRequiresIntsAsLongs) {
2777 VMRegPair *new_in_regs = NEW_RESOURCE_ARRAY(VMRegPair, i2l_argcnt);
2778 BasicType *new_in_sig_bt = NEW_RESOURCE_ARRAY(BasicType, i2l_argcnt);
2780 int argcnt = 0;
2781 for (int in = 0; in < in_args_count; in++, argcnt++) {
2782 BasicType bt = in_sig_bt[in];
2783 VMRegPair reg = in_regs[in];
2784 switch (bt) {
2785 case T_BOOLEAN:
2786 case T_CHAR:
2787 case T_BYTE:
2788 case T_SHORT:
2789 case T_INT:
2790 // Convert (bt) to (T_LONG,bt).
2791 new_in_sig_bt[argcnt ] = T_LONG;
2792 new_in_sig_bt[argcnt+1] = bt;
2793 assert(reg.first()->is_valid() && !reg.second()->is_valid(), "");
2794 new_in_regs[argcnt ].set2(reg.first());
2795 new_in_regs[argcnt+1].set_bad();
2796 argcnt++;
2797 break;
2798 default:
2799 // No conversion needed.
2800 new_in_sig_bt[argcnt] = bt;
2801 new_in_regs[argcnt] = reg;
2802 break;
2803 }
2804 }
2805 assert(argcnt == i2l_argcnt, "must match");
2807 in_regs = new_in_regs;
2808 in_sig_bt = new_in_sig_bt;
2809 in_args_count = i2l_argcnt;
2810 } else {
2811 assert(0, "This should not be needed on this platform");
2812 }
2813 }
2815 // -------------------------------------------------------------------------
2816 // Java-Java calling convention
2817 // (what you use when Java calls Java)
2819 //------------------------------name_for_receiver----------------------------------
2820 // For a given signature, return the VMReg for parameter 0.
2821 VMReg SharedRuntime::name_for_receiver() {
2822 VMRegPair regs;
2823 BasicType sig_bt = T_OBJECT;
2824 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2825 // Return argument 0 register. In the LP64 build pointers
2826 // take 2 registers, but the VM wants only the 'main' name.
2827 return regs.first();
2828 }
2830 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2831 // This method is returning a data structure allocating as a
2832 // ResourceObject, so do not put any ResourceMarks in here.
2833 char *s = sig->as_C_string();
2834 int len = (int)strlen(s);
2835 s++; len--; // Skip opening paren
2837 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );
2838 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );
2839 int cnt = 0;
2840 if (has_receiver) {
2841 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2842 }
2844 while( *s != ')' ) { // Find closing right paren
2845 switch( *s++ ) { // Switch on signature character
2846 case 'B': sig_bt[cnt++] = T_BYTE; break;
2847 case 'C': sig_bt[cnt++] = T_CHAR; break;
2848 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2849 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2850 case 'I': sig_bt[cnt++] = T_INT; break;
2851 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2852 case 'S': sig_bt[cnt++] = T_SHORT; break;
2853 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2854 case 'V': sig_bt[cnt++] = T_VOID; break;
2855 case 'L': // Oop
2856 while( *s++ != ';' ) ; // Skip signature
2857 sig_bt[cnt++] = T_OBJECT;
2858 break;
2859 case '[': { // Array
2860 do { // Skip optional size
2861 while( *s >= '0' && *s <= '9' ) s++;
2862 } while( *s++ == '[' ); // Nested arrays?
2863 // Skip element type
2864 if( s[-1] == 'L' )
2865 while( *s++ != ';' ) ; // Skip signature
2866 sig_bt[cnt++] = T_ARRAY;
2867 break;
2868 }
2869 default : ShouldNotReachHere();
2870 }
2871 }
2873 if (has_appendix) {
2874 sig_bt[cnt++] = T_OBJECT;
2875 }
2877 assert( cnt < 256, "grow table size" );
2879 int comp_args_on_stack;
2880 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2882 // the calling convention doesn't count out_preserve_stack_slots so
2883 // we must add that in to get "true" stack offsets.
2885 if (comp_args_on_stack) {
2886 for (int i = 0; i < cnt; i++) {
2887 VMReg reg1 = regs[i].first();
2888 if( reg1->is_stack()) {
2889 // Yuck
2890 reg1 = reg1->bias(out_preserve_stack_slots());
2891 }
2892 VMReg reg2 = regs[i].second();
2893 if( reg2->is_stack()) {
2894 // Yuck
2895 reg2 = reg2->bias(out_preserve_stack_slots());
2896 }
2897 regs[i].set_pair(reg2, reg1);
2898 }
2899 }
2901 // results
2902 *arg_size = cnt;
2903 return regs;
2904 }
2906 // OSR Migration Code
2907 //
2908 // This code is used convert interpreter frames into compiled frames. It is
2909 // called from very start of a compiled OSR nmethod. A temp array is
2910 // allocated to hold the interesting bits of the interpreter frame. All
2911 // active locks are inflated to allow them to move. The displaced headers and
2912 // active interpeter locals are copied into the temp buffer. Then we return
2913 // back to the compiled code. The compiled code then pops the current
2914 // interpreter frame off the stack and pushes a new compiled frame. Then it
2915 // copies the interpreter locals and displaced headers where it wants.
2916 // Finally it calls back to free the temp buffer.
2917 //
2918 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2920 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2922 //
2923 // This code is dependent on the memory layout of the interpreter local
2924 // array and the monitors. On all of our platforms the layout is identical
2925 // so this code is shared. If some platform lays the their arrays out
2926 // differently then this code could move to platform specific code or
2927 // the code here could be modified to copy items one at a time using
2928 // frame accessor methods and be platform independent.
2930 frame fr = thread->last_frame();
2931 assert( fr.is_interpreted_frame(), "" );
2932 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );
2934 // Figure out how many monitors are active.
2935 int active_monitor_count = 0;
2936 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2937 kptr < fr.interpreter_frame_monitor_begin();
2938 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2939 if( kptr->obj() != NULL ) active_monitor_count++;
2940 }
2942 // QQQ we could place number of active monitors in the array so that compiled code
2943 // could double check it.
2945 Method* moop = fr.interpreter_frame_method();
2946 int max_locals = moop->max_locals();
2947 // Allocate temp buffer, 1 word per local & 2 per active monitor
2948 int buf_size_words = max_locals + active_monitor_count*2;
2949 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2951 // Copy the locals. Order is preserved so that loading of longs works.
2952 // Since there's no GC I can copy the oops blindly.
2953 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2954 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2955 (HeapWord*)&buf[0],
2956 max_locals);
2958 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2959 int i = max_locals;
2960 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2961 kptr2 < fr.interpreter_frame_monitor_begin();
2962 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2963 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2964 BasicLock *lock = kptr2->lock();
2965 // Inflate so the displaced header becomes position-independent
2966 if (lock->displaced_header()->is_unlocked())
2967 ObjectSynchronizer::inflate_helper(kptr2->obj());
2968 // Now the displaced header is free to move
2969 buf[i++] = (intptr_t)lock->displaced_header();
2970 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2971 }
2972 }
2973 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );
2975 return buf;
2976 JRT_END
2978 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2979 FREE_C_HEAP_ARRAY(intptr_t,buf, mtCode);
2980 JRT_END
2982 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
2983 AdapterHandlerTableIterator iter(_adapters);
2984 while (iter.has_next()) {
2985 AdapterHandlerEntry* a = iter.next();
2986 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
2987 }
2988 return false;
2989 }
2991 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) {
2992 AdapterHandlerTableIterator iter(_adapters);
2993 while (iter.has_next()) {
2994 AdapterHandlerEntry* a = iter.next();
2995 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
2996 st->print("Adapter for signature: ");
2997 a->print_adapter_on(tty);
2998 return;
2999 }
3000 }
3001 assert(false, "Should have found handler");
3002 }
3004 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3005 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
3006 (intptr_t) this, fingerprint()->as_string(),
3007 get_i2c_entry(), get_c2i_entry(), get_c2i_unverified_entry());
3009 }
3011 #ifndef PRODUCT
3013 void AdapterHandlerLibrary::print_statistics() {
3014 _adapters->print_statistics();
3015 }
3017 #endif /* PRODUCT */