Thu, 27 Dec 2018 11:43:33 +0800
Merge
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 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #include "precompiled.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/compiledIC.hpp"
35 #include "code/scopeDesc.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/compilerOracle.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/interpreterRuntime.hpp"
43 #include "memory/gcLocker.inline.hpp"
44 #include "memory/universe.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/forte.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "prims/jvmtiRedefineClassesTrace.hpp"
49 #include "prims/methodHandles.hpp"
50 #include "prims/nativeLookup.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/biasedLocking.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/javaCalls.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/vframe.hpp"
60 #include "runtime/vframeArray.hpp"
61 #include "utilities/copy.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/hashtable.inline.hpp"
65 #include "utilities/macros.hpp"
66 #include "utilities/xmlstream.hpp"
67 #ifdef TARGET_ARCH_x86
68 # include "nativeInst_x86.hpp"
69 # include "vmreg_x86.inline.hpp"
70 #endif
71 #ifdef TARGET_ARCH_sparc
72 # include "nativeInst_sparc.hpp"
73 # include "vmreg_sparc.inline.hpp"
74 #endif
75 #ifdef TARGET_ARCH_zero
76 # include "nativeInst_zero.hpp"
77 # include "vmreg_zero.inline.hpp"
78 #endif
79 #ifdef TARGET_ARCH_arm
80 # include "nativeInst_arm.hpp"
81 # include "vmreg_arm.inline.hpp"
82 #endif
83 #ifdef TARGET_ARCH_ppc
84 # include "nativeInst_ppc.hpp"
85 # include "vmreg_ppc.inline.hpp"
86 #endif
87 #ifdef TARGET_ARCH_mips
88 # include "nativeInst_mips.hpp"
89 # include "vmreg_mips.inline.hpp"
90 #endif
92 #ifdef COMPILER1
93 #include "c1/c1_Runtime1.hpp"
94 #endif
96 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
98 // Shared stub locations
99 RuntimeStub* SharedRuntime::_wrong_method_blob;
100 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
101 RuntimeStub* SharedRuntime::_ic_miss_blob;
102 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
103 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
104 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
106 DeoptimizationBlob* SharedRuntime::_deopt_blob;
107 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
108 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
109 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
111 #ifdef COMPILER2
112 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
113 #endif // COMPILER2
116 //----------------------------generate_stubs-----------------------------------
117 void SharedRuntime::generate_stubs() {
118 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
119 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
120 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
121 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
122 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
123 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
125 #ifdef COMPILER2
126 // Vectors are generated only by C2.
127 if (is_wide_vector(MaxVectorSize)) {
128 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
129 }
130 #endif // COMPILER2
131 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
132 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
134 generate_deopt_blob();
136 #ifdef COMPILER2
137 generate_uncommon_trap_blob();
138 #endif // COMPILER2
139 }
141 #include <math.h>
143 #ifndef USDT2
144 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t);
145 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int,
146 char*, int, char*, int, char*, int);
147 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int,
148 char*, int, char*, int, char*, int);
149 #endif /* !USDT2 */
151 // Implementation of SharedRuntime
153 #ifndef PRODUCT
154 // For statistics
155 int SharedRuntime::_ic_miss_ctr = 0;
156 int SharedRuntime::_wrong_method_ctr = 0;
157 int SharedRuntime::_resolve_static_ctr = 0;
158 int SharedRuntime::_resolve_virtual_ctr = 0;
159 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
160 int SharedRuntime::_implicit_null_throws = 0;
161 int SharedRuntime::_implicit_div0_throws = 0;
162 int SharedRuntime::_throw_null_ctr = 0;
164 int SharedRuntime::_nof_normal_calls = 0;
165 int SharedRuntime::_nof_optimized_calls = 0;
166 int SharedRuntime::_nof_inlined_calls = 0;
167 int SharedRuntime::_nof_megamorphic_calls = 0;
168 int SharedRuntime::_nof_static_calls = 0;
169 int SharedRuntime::_nof_inlined_static_calls = 0;
170 int SharedRuntime::_nof_interface_calls = 0;
171 int SharedRuntime::_nof_optimized_interface_calls = 0;
172 int SharedRuntime::_nof_inlined_interface_calls = 0;
173 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
174 int SharedRuntime::_nof_removable_exceptions = 0;
176 int SharedRuntime::_new_instance_ctr=0;
177 int SharedRuntime::_new_array_ctr=0;
178 int SharedRuntime::_multi1_ctr=0;
179 int SharedRuntime::_multi2_ctr=0;
180 int SharedRuntime::_multi3_ctr=0;
181 int SharedRuntime::_multi4_ctr=0;
182 int SharedRuntime::_multi5_ctr=0;
183 int SharedRuntime::_mon_enter_stub_ctr=0;
184 int SharedRuntime::_mon_exit_stub_ctr=0;
185 int SharedRuntime::_mon_enter_ctr=0;
186 int SharedRuntime::_mon_exit_ctr=0;
187 int SharedRuntime::_partial_subtype_ctr=0;
188 int SharedRuntime::_jbyte_array_copy_ctr=0;
189 int SharedRuntime::_jshort_array_copy_ctr=0;
190 int SharedRuntime::_jint_array_copy_ctr=0;
191 int SharedRuntime::_jlong_array_copy_ctr=0;
192 int SharedRuntime::_oop_array_copy_ctr=0;
193 int SharedRuntime::_checkcast_array_copy_ctr=0;
194 int SharedRuntime::_unsafe_array_copy_ctr=0;
195 int SharedRuntime::_generic_array_copy_ctr=0;
196 int SharedRuntime::_slow_array_copy_ctr=0;
197 int SharedRuntime::_find_handler_ctr=0;
198 int SharedRuntime::_rethrow_ctr=0;
200 int SharedRuntime::_ICmiss_index = 0;
201 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
202 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
205 void SharedRuntime::trace_ic_miss(address at) {
206 for (int i = 0; i < _ICmiss_index; i++) {
207 if (_ICmiss_at[i] == at) {
208 _ICmiss_count[i]++;
209 return;
210 }
211 }
212 int index = _ICmiss_index++;
213 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
214 _ICmiss_at[index] = at;
215 _ICmiss_count[index] = 1;
216 }
218 void SharedRuntime::print_ic_miss_histogram() {
219 if (ICMissHistogram) {
220 tty->print_cr ("IC Miss Histogram:");
221 int tot_misses = 0;
222 for (int i = 0; i < _ICmiss_index; i++) {
223 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]);
224 tot_misses += _ICmiss_count[i];
225 }
226 tty->print_cr ("Total IC misses: %7d", tot_misses);
227 }
228 }
229 #endif // PRODUCT
230 void SharedRuntime::print_long(long long i) {
231 tty->print("%llx", i);
232 }
234 void SharedRuntime::print_int(int i) {
235 tty->print("%x", i);
236 }
238 void SharedRuntime::print_float(float f) {
239 tty->print("ld:%ld ", f);
240 tty->print("lx:%lx ", f);
241 tty->print("lf:%g ", f);
242 }
244 void SharedRuntime::print_double(double f) {
245 tty->print("%ld ", f);
246 tty->print("0x%lx ", f);
247 tty->print("%g ", f);
248 }
250 void SharedRuntime::print_str(char *str) {
251 tty->print("%s", str);
252 }
254 void SharedRuntime::print_reg_with_pc(char *reg_name, long i, long pc) {
255 tty->print_cr("%s: %lx pc: %lx", reg_name, i, pc);
256 }
258 #if INCLUDE_ALL_GCS
260 // G1 write-barrier pre: executed before a pointer store.
261 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
262 if (orig == NULL) {
263 assert(false, "should be optimized out");
264 return;
265 }
266 assert(orig->is_oop(true /* ignore mark word */), "Error");
267 // store the original value that was in the field reference
268 thread->satb_mark_queue().enqueue(orig);
269 JRT_END
271 // G1 write-barrier post: executed after a pointer store.
272 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
273 thread->dirty_card_queue().enqueue(card_addr);
274 JRT_END
276 #endif // INCLUDE_ALL_GCS
279 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
280 return x * y;
281 JRT_END
284 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
285 if (x == min_jlong && y == CONST64(-1)) {
286 return x;
287 } else {
288 return x / y;
289 }
290 JRT_END
293 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
294 if (x == min_jlong && y == CONST64(-1)) {
295 return 0;
296 } else {
297 return x % y;
298 }
299 JRT_END
302 const juint float_sign_mask = 0x7FFFFFFF;
303 const juint float_infinity = 0x7F800000;
304 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
305 const julong double_infinity = CONST64(0x7FF0000000000000);
307 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
308 #ifdef _WIN64
309 // 64-bit Windows on amd64 returns the wrong values for
310 // infinity operands.
311 union { jfloat f; juint i; } xbits, ybits;
312 xbits.f = x;
313 ybits.f = y;
314 // x Mod Infinity == x unless x is infinity
315 if ( ((xbits.i & float_sign_mask) != float_infinity) &&
316 ((ybits.i & float_sign_mask) == float_infinity) ) {
317 return x;
318 }
319 #endif
320 return ((jfloat)fmod((double)x,(double)y));
321 JRT_END
324 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
325 #ifdef _WIN64
326 union { jdouble d; julong l; } xbits, ybits;
327 xbits.d = x;
328 ybits.d = y;
329 // x Mod Infinity == x unless x is infinity
330 if ( ((xbits.l & double_sign_mask) != double_infinity) &&
331 ((ybits.l & double_sign_mask) == double_infinity) ) {
332 return x;
333 }
334 #endif
335 return ((jdouble)fmod((double)x,(double)y));
336 JRT_END
338 #ifdef __SOFTFP__
339 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
340 return x + y;
341 JRT_END
343 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
344 return x - y;
345 JRT_END
347 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
348 return x * y;
349 JRT_END
351 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
352 return x / y;
353 JRT_END
355 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
356 return x + y;
357 JRT_END
359 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
360 return x - y;
361 JRT_END
363 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
364 return x * y;
365 JRT_END
367 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
368 return x / y;
369 JRT_END
371 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
372 return (jfloat)x;
373 JRT_END
375 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
376 return (jdouble)x;
377 JRT_END
379 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
380 return (jdouble)x;
381 JRT_END
383 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
384 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
385 JRT_END
387 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
388 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
389 JRT_END
391 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
392 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
393 JRT_END
395 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
396 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
397 JRT_END
399 // Functions to return the opposite of the aeabi functions for nan.
400 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
401 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
402 JRT_END
404 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
405 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
406 JRT_END
408 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
409 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
410 JRT_END
412 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
413 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
414 JRT_END
416 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
417 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
418 JRT_END
420 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
421 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
422 JRT_END
424 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
425 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
426 JRT_END
428 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
429 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
430 JRT_END
432 // Intrinsics make gcc generate code for these.
433 float SharedRuntime::fneg(float f) {
434 return -f;
435 }
437 double SharedRuntime::dneg(double f) {
438 return -f;
439 }
441 #endif // __SOFTFP__
443 #if defined(__SOFTFP__) || defined(E500V2)
444 // Intrinsics make gcc generate code for these.
445 double SharedRuntime::dabs(double f) {
446 return (f <= (double)0.0) ? (double)0.0 - f : f;
447 }
449 #endif
451 #if defined(__SOFTFP__) || defined(PPC32)
452 double SharedRuntime::dsqrt(double f) {
453 return sqrt(f);
454 }
455 #endif
457 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
458 if (g_isnan(x))
459 return 0;
460 if (x >= (jfloat) max_jint)
461 return max_jint;
462 if (x <= (jfloat) min_jint)
463 return min_jint;
464 return (jint) x;
465 JRT_END
468 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
469 if (g_isnan(x))
470 return 0;
471 if (x >= (jfloat) max_jlong)
472 return max_jlong;
473 if (x <= (jfloat) min_jlong)
474 return min_jlong;
475 return (jlong) x;
476 JRT_END
479 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
480 if (g_isnan(x))
481 return 0;
482 if (x >= (jdouble) max_jint)
483 return max_jint;
484 if (x <= (jdouble) min_jint)
485 return min_jint;
486 return (jint) x;
487 JRT_END
490 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
491 if (g_isnan(x))
492 return 0;
493 if (x >= (jdouble) max_jlong)
494 return max_jlong;
495 if (x <= (jdouble) min_jlong)
496 return min_jlong;
497 return (jlong) x;
498 JRT_END
501 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
502 return (jfloat)x;
503 JRT_END
506 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
507 return (jfloat)x;
508 JRT_END
511 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
512 return (jdouble)x;
513 JRT_END
515 // Exception handling accross interpreter/compiler boundaries
516 //
517 // exception_handler_for_return_address(...) returns the continuation address.
518 // The continuation address is the entry point of the exception handler of the
519 // previous frame depending on the return address.
521 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
522 assert(frame::verify_return_pc(return_address), err_msg("must be a return address: " INTPTR_FORMAT, return_address));
523 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
525 // Reset method handle flag.
526 thread->set_is_method_handle_return(false);
528 // The fastest case first
529 CodeBlob* blob = CodeCache::find_blob(return_address);
530 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL;
531 if (nm != NULL) {
532 // Set flag if return address is a method handle call site.
533 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
534 // native nmethods don't have exception handlers
535 assert(!nm->is_native_method(), "no exception handler");
536 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
537 if (nm->is_deopt_pc(return_address)) {
538 // If we come here because of a stack overflow, the stack may be
539 // unguarded. Reguard the stack otherwise if we return to the
540 // deopt blob and the stack bang causes a stack overflow we
541 // crash.
542 bool guard_pages_enabled = thread->stack_yellow_zone_enabled();
543 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
544 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
545 return SharedRuntime::deopt_blob()->unpack_with_exception();
546 } else {
547 return nm->exception_begin();
548 }
549 }
551 // Entry code
552 if (StubRoutines::returns_to_call_stub(return_address)) {
553 return StubRoutines::catch_exception_entry();
554 }
555 // Interpreted code
556 if (Interpreter::contains(return_address)) {
557 return Interpreter::rethrow_exception_entry();
558 }
560 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
561 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
563 #ifndef PRODUCT
564 { ResourceMark rm;
565 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address);
566 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
567 tty->print_cr("b) other problem");
568 }
569 #endif // PRODUCT
571 ShouldNotReachHere();
572 return NULL;
573 }
576 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
577 return raw_exception_handler_for_return_address(thread, return_address);
578 JRT_END
581 address SharedRuntime::get_poll_stub(address pc) {
582 address stub;
583 // Look up the code blob
584 CodeBlob *cb = CodeCache::find_blob(pc);
586 // Should be an nmethod
587 guarantee(cb != NULL && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
589 // Look up the relocation information
590 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc),
591 "safepoint polling: type must be poll" );
593 assert( ((NativeInstruction*)pc)->is_safepoint_poll(),
594 "Only polling locations are used for safepoint");
596 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);
597 bool has_wide_vectors = ((nmethod*)cb)->has_wide_vectors();
598 if (at_poll_return) {
599 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
600 "polling page return stub not created yet");
601 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
602 } else if (has_wide_vectors) {
603 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
604 "polling page vectors safepoint stub not created yet");
605 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
606 } else {
607 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
608 "polling page safepoint stub not created yet");
609 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
610 }
611 #ifndef PRODUCT
612 if( TraceSafepoint ) {
613 char buf[256];
614 jio_snprintf(buf, sizeof(buf),
615 "... found polling page %s exception at pc = "
616 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
617 at_poll_return ? "return" : "loop",
618 (intptr_t)pc, (intptr_t)stub);
619 tty->print_raw_cr(buf);
620 }
621 #endif // PRODUCT
622 return stub;
623 }
626 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
627 assert(caller.is_interpreted_frame(), "");
628 int args_size = ArgumentSizeComputer(sig).size() + 1;
629 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
630 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
631 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
632 return result;
633 }
636 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
637 if (JvmtiExport::can_post_on_exceptions()) {
638 vframeStream vfst(thread, true);
639 methodHandle method = methodHandle(thread, vfst.method());
640 address bcp = method()->bcp_from(vfst.bci());
641 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
642 }
643 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
644 }
646 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
647 Handle h_exception = Exceptions::new_exception(thread, name, message);
648 throw_and_post_jvmti_exception(thread, h_exception);
649 }
651 // The interpreter code to call this tracing function is only
652 // called/generated when TraceRedefineClasses has the right bits
653 // set. Since obsolete methods are never compiled, we don't have
654 // to modify the compilers to generate calls to this function.
655 //
656 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
657 JavaThread* thread, Method* method))
658 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
660 if (method->is_obsolete()) {
661 // We are calling an obsolete method, but this is not necessarily
662 // an error. Our method could have been redefined just after we
663 // fetched the Method* from the constant pool.
665 // RC_TRACE macro has an embedded ResourceMark
666 RC_TRACE_WITH_THREAD(0x00001000, thread,
667 ("calling obsolete method '%s'",
668 method->name_and_sig_as_C_string()));
669 if (RC_TRACE_ENABLED(0x00002000)) {
670 // this option is provided to debug calls to obsolete methods
671 guarantee(false, "faulting at call to an obsolete method.");
672 }
673 }
674 return 0;
675 JRT_END
677 // ret_pc points into caller; we are returning caller's exception handler
678 // for given exception
679 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
680 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
681 assert(nm != NULL, "must exist");
682 ResourceMark rm;
684 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
685 // determine handler bci, if any
686 EXCEPTION_MARK;
688 int handler_bci = -1;
689 int scope_depth = 0;
690 if (!force_unwind) {
691 int bci = sd->bci();
692 bool recursive_exception = false;
693 do {
694 bool skip_scope_increment = false;
695 // exception handler lookup
696 KlassHandle ek (THREAD, exception->klass());
697 methodHandle mh(THREAD, sd->method());
698 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
699 if (HAS_PENDING_EXCEPTION) {
700 recursive_exception = true;
701 // We threw an exception while trying to find the exception handler.
702 // Transfer the new exception to the exception handle which will
703 // be set into thread local storage, and do another lookup for an
704 // exception handler for this exception, this time starting at the
705 // BCI of the exception handler which caused the exception to be
706 // thrown (bugs 4307310 and 4546590). Set "exception" reference
707 // argument to ensure that the correct exception is thrown (4870175).
708 recursive_exception_occurred = true;
709 exception = Handle(THREAD, PENDING_EXCEPTION);
710 CLEAR_PENDING_EXCEPTION;
711 if (handler_bci >= 0) {
712 bci = handler_bci;
713 handler_bci = -1;
714 skip_scope_increment = true;
715 }
716 }
717 else {
718 recursive_exception = false;
719 }
720 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
721 sd = sd->sender();
722 if (sd != NULL) {
723 bci = sd->bci();
724 }
725 ++scope_depth;
726 }
727 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
728 }
730 // found handling method => lookup exception handler
731 int catch_pco = ret_pc - nm->code_begin();
733 ExceptionHandlerTable table(nm);
734 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
735 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
736 // Allow abbreviated catch tables. The idea is to allow a method
737 // to materialize its exceptions without committing to the exact
738 // routing of exceptions. In particular this is needed for adding
739 // a synthethic handler to unlock monitors when inlining
740 // synchonized methods since the unlock path isn't represented in
741 // the bytecodes.
742 t = table.entry_for(catch_pco, -1, 0);
743 }
745 #ifdef COMPILER1
746 if (t == NULL && nm->is_compiled_by_c1()) {
747 assert(nm->unwind_handler_begin() != NULL, "");
748 return nm->unwind_handler_begin();
749 }
750 #endif
752 if (t == NULL) {
753 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci);
754 tty->print_cr(" Exception:");
755 exception->print();
756 tty->cr();
757 tty->print_cr(" Compiled exception table :");
758 table.print();
759 nm->print_code();
760 guarantee(false, "missing exception handler");
761 return NULL;
762 }
764 return nm->code_begin() + t->pco();
765 }
767 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
768 // These errors occur only at call sites
769 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
770 JRT_END
772 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
773 // These errors occur only at call sites
774 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
775 JRT_END
777 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
778 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
779 JRT_END
781 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
782 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
783 JRT_END
785 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
786 // This entry point is effectively only used for NullPointerExceptions which occur at inline
787 // cache sites (when the callee activation is not yet set up) so we are at a call site
788 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
789 JRT_END
791 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
792 // We avoid using the normal exception construction in this case because
793 // it performs an upcall to Java, and we're already out of stack space.
794 Klass* k = SystemDictionary::StackOverflowError_klass();
795 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
796 Handle exception (thread, exception_oop);
797 if (StackTraceInThrowable) {
798 java_lang_Throwable::fill_in_stack_trace(exception);
799 }
800 // Increment counter for hs_err file reporting
801 Atomic::inc(&Exceptions::_stack_overflow_errors);
802 throw_and_post_jvmti_exception(thread, exception);
803 JRT_END
805 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
806 address pc,
807 SharedRuntime::ImplicitExceptionKind exception_kind)
808 {
809 address target_pc = NULL;
811 if (Interpreter::contains(pc)) {
812 #ifdef CC_INTERP
813 // C++ interpreter doesn't throw implicit exceptions
814 ShouldNotReachHere();
815 #else
816 switch (exception_kind) {
817 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
818 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
819 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
820 default: ShouldNotReachHere();
821 }
822 #endif // !CC_INTERP
823 } else {
824 switch (exception_kind) {
825 case STACK_OVERFLOW: {
826 // Stack overflow only occurs upon frame setup; the callee is
827 // going to be unwound. Dispatch to a shared runtime stub
828 // which will cause the StackOverflowError to be fabricated
829 // and processed.
830 // Stack overflow should never occur during deoptimization:
831 // the compiled method bangs the stack by as much as the
832 // interpreter would need in case of a deoptimization. The
833 // deoptimization blob and uncommon trap blob bang the stack
834 // in a debug VM to verify the correctness of the compiled
835 // method stack banging.
836 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
837 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, pc);
838 return StubRoutines::throw_StackOverflowError_entry();
839 }
841 case IMPLICIT_NULL: {
842 if (VtableStubs::contains(pc)) {
843 // We haven't yet entered the callee frame. Fabricate an
844 // exception and begin dispatching it in the caller. Since
845 // the caller was at a call site, it's safe to destroy all
846 // caller-saved registers, as these entry points do.
847 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
849 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
850 if (vt_stub == NULL) return NULL;
852 if (vt_stub->is_abstract_method_error(pc)) {
853 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
854 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, pc);
855 return StubRoutines::throw_AbstractMethodError_entry();
856 } else {
857 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, pc);
858 return StubRoutines::throw_NullPointerException_at_call_entry();
859 }
860 } else {
861 CodeBlob* cb = CodeCache::find_blob(pc);
863 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
864 if (cb == NULL) return NULL;
866 // Exception happened in CodeCache. Must be either:
867 // 1. Inline-cache check in C2I handler blob,
868 // 2. Inline-cache check in nmethod, or
869 // 3. Implict null exception in nmethod
871 if (!cb->is_nmethod()) {
872 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
873 if (!is_in_blob) {
874 cb->print();
875 fatal(err_msg("exception happened outside interpreter, nmethods and vtable stubs at pc " INTPTR_FORMAT, pc));
876 }
877 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, pc);
878 // There is no handler here, so we will simply unwind.
879 return StubRoutines::throw_NullPointerException_at_call_entry();
880 }
882 // Otherwise, it's an nmethod. Consult its exception handlers.
883 nmethod* nm = (nmethod*)cb;
884 if (nm->inlinecache_check_contains(pc)) {
885 // exception happened inside inline-cache check code
886 // => the nmethod is not yet active (i.e., the frame
887 // is not set up yet) => use return address pushed by
888 // caller => don't push another return address
889 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, pc);
890 return StubRoutines::throw_NullPointerException_at_call_entry();
891 }
893 if (nm->method()->is_method_handle_intrinsic()) {
894 // exception happened inside MH dispatch code, similar to a vtable stub
895 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, pc);
896 return StubRoutines::throw_NullPointerException_at_call_entry();
897 }
899 #ifndef PRODUCT
900 _implicit_null_throws++;
901 #endif
902 target_pc = nm->continuation_for_implicit_exception(pc);
903 // If there's an unexpected fault, target_pc might be NULL,
904 // in which case we want to fall through into the normal
905 // error handling code.
906 }
908 break; // fall through
909 }
912 case IMPLICIT_DIVIDE_BY_ZERO: {
913 nmethod* nm = CodeCache::find_nmethod(pc);
914 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");
915 #ifndef PRODUCT
916 _implicit_div0_throws++;
917 #endif
918 target_pc = nm->continuation_for_implicit_exception(pc);
919 // If there's an unexpected fault, target_pc might be NULL,
920 // in which case we want to fall through into the normal
921 // error handling code.
922 break; // fall through
923 }
925 default: ShouldNotReachHere();
926 }
928 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
930 // for AbortVMOnException flag
931 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));
932 if (exception_kind == IMPLICIT_NULL) {
933 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
934 } else {
935 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
936 }
937 return target_pc;
938 }
940 ShouldNotReachHere();
941 return NULL;
942 }
945 /**
946 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
947 * installed in the native function entry of all native Java methods before
948 * they get linked to their actual native methods.
949 *
950 * \note
951 * This method actually never gets called! The reason is because
952 * the interpreter's native entries call NativeLookup::lookup() which
953 * throws the exception when the lookup fails. The exception is then
954 * caught and forwarded on the return from NativeLookup::lookup() call
955 * before the call to the native function. This might change in the future.
956 */
957 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
958 {
959 // We return a bad value here to make sure that the exception is
960 // forwarded before we look at the return value.
961 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
962 }
963 JNI_END
965 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
966 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
967 }
970 #ifndef PRODUCT
971 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
972 const frame f = thread->last_frame();
973 assert(f.is_interpreted_frame(), "must be an interpreted frame");
974 #ifndef PRODUCT
975 methodHandle mh(THREAD, f.interpreter_frame_method());
976 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
977 #endif // !PRODUCT
978 return preserve_this_value;
979 JRT_END
980 #endif // !PRODUCT
983 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts))
984 os::yield_all(attempts);
985 JRT_END
988 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
989 assert(obj->is_oop(), "must be a valid oop");
990 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
991 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
992 JRT_END
995 jlong SharedRuntime::get_java_tid(Thread* thread) {
996 if (thread != NULL) {
997 if (thread->is_Java_thread()) {
998 oop obj = ((JavaThread*)thread)->threadObj();
999 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
1000 }
1001 }
1002 return 0;
1003 }
1005 /**
1006 * This function ought to be a void function, but cannot be because
1007 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1008 * 6254741. Once that is fixed we can remove the dummy return value.
1009 */
1010 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
1011 return dtrace_object_alloc_base(Thread::current(), o, size);
1012 }
1014 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
1015 assert(DTraceAllocProbes, "wrong call");
1016 Klass* klass = o->klass();
1017 Symbol* name = klass->name();
1018 #ifndef USDT2
1019 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread),
1020 name->bytes(), name->utf8_length(), size * HeapWordSize);
1021 #else /* USDT2 */
1022 HOTSPOT_OBJECT_ALLOC(
1023 get_java_tid(thread),
1024 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1025 #endif /* USDT2 */
1026 return 0;
1027 }
1029 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1030 JavaThread* thread, Method* method))
1031 assert(DTraceMethodProbes, "wrong call");
1032 Symbol* kname = method->klass_name();
1033 Symbol* name = method->name();
1034 Symbol* sig = method->signature();
1035 #ifndef USDT2
1036 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread),
1037 kname->bytes(), kname->utf8_length(),
1038 name->bytes(), name->utf8_length(),
1039 sig->bytes(), sig->utf8_length());
1040 #else /* USDT2 */
1041 HOTSPOT_METHOD_ENTRY(
1042 get_java_tid(thread),
1043 (char *) kname->bytes(), kname->utf8_length(),
1044 (char *) name->bytes(), name->utf8_length(),
1045 (char *) sig->bytes(), sig->utf8_length());
1046 #endif /* USDT2 */
1047 return 0;
1048 JRT_END
1050 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1051 JavaThread* thread, Method* method))
1052 assert(DTraceMethodProbes, "wrong call");
1053 Symbol* kname = method->klass_name();
1054 Symbol* name = method->name();
1055 Symbol* sig = method->signature();
1056 #ifndef USDT2
1057 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread),
1058 kname->bytes(), kname->utf8_length(),
1059 name->bytes(), name->utf8_length(),
1060 sig->bytes(), sig->utf8_length());
1061 #else /* USDT2 */
1062 HOTSPOT_METHOD_RETURN(
1063 get_java_tid(thread),
1064 (char *) kname->bytes(), kname->utf8_length(),
1065 (char *) name->bytes(), name->utf8_length(),
1066 (char *) sig->bytes(), sig->utf8_length());
1067 #endif /* USDT2 */
1068 return 0;
1069 JRT_END
1072 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1073 // for a call current in progress, i.e., arguments has been pushed on stack
1074 // put callee has not been invoked yet. Used by: resolve virtual/static,
1075 // vtable updates, etc. Caller frame must be compiled.
1076 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1077 ResourceMark rm(THREAD);
1079 // last java frame on stack (which includes native call frames)
1080 vframeStream vfst(thread, true); // Do not skip and javaCalls
1082 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));
1083 }
1086 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1087 // for a call current in progress, i.e., arguments has been pushed on stack
1088 // but callee has not been invoked yet. Caller frame must be compiled.
1089 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1090 vframeStream& vfst,
1091 Bytecodes::Code& bc,
1092 CallInfo& callinfo, TRAPS) {
1093 Handle receiver;
1094 Handle nullHandle; //create a handy null handle for exception returns
1096 assert(!vfst.at_end(), "Java frame must exist");
1098 // Find caller and bci from vframe
1099 methodHandle caller(THREAD, vfst.method());
1100 int bci = vfst.bci();
1102 // Find bytecode
1103 Bytecode_invoke bytecode(caller, bci);
1104 bc = bytecode.invoke_code();
1105 int bytecode_index = bytecode.index();
1107 // Find receiver for non-static call
1108 if (bc != Bytecodes::_invokestatic &&
1109 bc != Bytecodes::_invokedynamic &&
1110 bc != Bytecodes::_invokehandle) {
1111 // This register map must be update since we need to find the receiver for
1112 // compiled frames. The receiver might be in a register.
1113 RegisterMap reg_map2(thread);
1114 frame stubFrame = thread->last_frame();
1115 // Caller-frame is a compiled frame
1116 frame callerFrame = stubFrame.sender(®_map2);
1118 methodHandle callee = bytecode.static_target(CHECK_(nullHandle));
1119 if (callee.is_null()) {
1120 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1121 }
1122 // Retrieve from a compiled argument list
1123 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1125 if (receiver.is_null()) {
1126 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1127 }
1128 }
1130 // Resolve method. This is parameterized by bytecode.
1131 constantPoolHandle constants(THREAD, caller->constants());
1132 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1133 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));
1135 #ifdef ASSERT
1136 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1137 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic && bc != Bytecodes::_invokehandle) {
1138 assert(receiver.not_null(), "should have thrown exception");
1139 KlassHandle receiver_klass(THREAD, receiver->klass());
1140 Klass* rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));
1141 // klass is already loaded
1142 KlassHandle static_receiver_klass(THREAD, rk);
1143 // Method handle invokes might have been optimized to a direct call
1144 // so don't check for the receiver class.
1145 // FIXME this weakens the assert too much
1146 methodHandle callee = callinfo.selected_method();
1147 assert(receiver_klass->is_subtype_of(static_receiver_klass()) ||
1148 callee->is_method_handle_intrinsic() ||
1149 callee->is_compiled_lambda_form(),
1150 "actual receiver must be subclass of static receiver klass");
1151 if (receiver_klass->oop_is_instance()) {
1152 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1153 tty->print_cr("ERROR: Klass not yet initialized!!");
1154 receiver_klass()->print();
1155 }
1156 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1157 }
1158 }
1159 #endif
1161 return receiver;
1162 }
1164 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1165 ResourceMark rm(THREAD);
1166 // We need first to check if any Java activations (compiled, interpreted)
1167 // exist on the stack since last JavaCall. If not, we need
1168 // to get the target method from the JavaCall wrapper.
1169 vframeStream vfst(thread, true); // Do not skip any javaCalls
1170 methodHandle callee_method;
1171 if (vfst.at_end()) {
1172 // No Java frames were found on stack since we did the JavaCall.
1173 // Hence the stack can only contain an entry_frame. We need to
1174 // find the target method from the stub frame.
1175 RegisterMap reg_map(thread, false);
1176 frame fr = thread->last_frame();
1177 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1178 fr = fr.sender(®_map);
1179 assert(fr.is_entry_frame(), "must be");
1180 // fr is now pointing to the entry frame.
1181 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1182 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1183 } else {
1184 Bytecodes::Code bc;
1185 CallInfo callinfo;
1186 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1187 callee_method = callinfo.selected_method();
1188 }
1189 assert(callee_method()->is_method(), "must be");
1190 return callee_method;
1191 }
1193 // Resolves a call.
1194 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1195 bool is_virtual,
1196 bool is_optimized, TRAPS) {
1197 methodHandle callee_method;
1198 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1199 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1200 int retry_count = 0;
1201 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1202 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1203 // If has a pending exception then there is no need to re-try to
1204 // resolve this method.
1205 // If the method has been redefined, we need to try again.
1206 // Hack: we have no way to update the vtables of arrays, so don't
1207 // require that java.lang.Object has been updated.
1209 // It is very unlikely that method is redefined more than 100 times
1210 // in the middle of resolve. If it is looping here more than 100 times
1211 // means then there could be a bug here.
1212 guarantee((retry_count++ < 100),
1213 "Could not resolve to latest version of redefined method");
1214 // method is redefined in the middle of resolve so re-try.
1215 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1216 }
1217 }
1218 return callee_method;
1219 }
1221 // Resolves a call. The compilers generate code for calls that go here
1222 // and are patched with the real destination of the call.
1223 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1224 bool is_virtual,
1225 bool is_optimized, TRAPS) {
1227 ResourceMark rm(thread);
1228 RegisterMap cbl_map(thread, false);
1229 frame caller_frame = thread->last_frame().sender(&cbl_map);
1231 CodeBlob* caller_cb = caller_frame.cb();
1232 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
1233 nmethod* caller_nm = caller_cb->as_nmethod_or_null();
1235 // make sure caller is not getting deoptimized
1236 // and removed before we are done with it.
1237 // CLEANUP - with lazy deopt shouldn't need this lock
1238 nmethodLocker caller_lock(caller_nm);
1240 // determine call info & receiver
1241 // note: a) receiver is NULL for static calls
1242 // b) an exception is thrown if receiver is NULL for non-static calls
1243 CallInfo call_info;
1244 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1245 Handle receiver = find_callee_info(thread, invoke_code,
1246 call_info, CHECK_(methodHandle()));
1247 methodHandle callee_method = call_info.selected_method();
1249 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1250 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1251 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1252 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1254 assert(caller_nm->is_alive(), "It should be alive");
1256 #ifndef PRODUCT
1257 // tracing/debugging/statistics
1258 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1259 (is_virtual) ? (&_resolve_virtual_ctr) :
1260 (&_resolve_static_ctr);
1261 Atomic::inc(addr);
1263 if (TraceCallFixup) {
1264 ResourceMark rm(thread);
1265 tty->print("resolving %s%s (%s) call to",
1266 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1267 Bytecodes::name(invoke_code));
1268 callee_method->print_short_name(tty);
1269 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, caller_frame.pc(), callee_method->code());
1270 }
1271 #endif
1273 // JSR 292 key invariant:
1274 // If the resolved method is a MethodHandle invoke target, the call
1275 // site must be a MethodHandle call site, because the lambda form might tail-call
1276 // leaving the stack in a state unknown to either caller or callee
1277 // TODO detune for now but we might need it again
1278 // assert(!callee_method->is_compiled_lambda_form() ||
1279 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1281 // Compute entry points. This might require generation of C2I converter
1282 // frames, so we cannot be holding any locks here. Furthermore, the
1283 // computation of the entry points is independent of patching the call. We
1284 // always return the entry-point, but we only patch the stub if the call has
1285 // not been deoptimized. Return values: For a virtual call this is an
1286 // (cached_oop, destination address) pair. For a static call/optimized
1287 // virtual this is just a destination address.
1289 StaticCallInfo static_call_info;
1290 CompiledICInfo virtual_call_info;
1292 // Make sure the callee nmethod does not get deoptimized and removed before
1293 // we are done patching the code.
1294 nmethod* callee_nm = callee_method->code();
1295 if (callee_nm != NULL && !callee_nm->is_in_use()) {
1296 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1297 callee_nm = NULL;
1298 }
1299 nmethodLocker nl_callee(callee_nm);
1300 #ifdef ASSERT
1301 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below
1302 #endif
1304 if (is_virtual) {
1305 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1306 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1307 KlassHandle h_klass(THREAD, invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass());
1308 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1309 is_optimized, static_bound, virtual_call_info,
1310 CHECK_(methodHandle()));
1311 } else {
1312 // static call
1313 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1314 }
1316 // grab lock, check for deoptimization and potentially patch caller
1317 {
1318 MutexLocker ml_patch(CompiledIC_lock);
1320 // Lock blocks for safepoint during which both nmethods can change state.
1322 // Now that we are ready to patch if the Method* was redefined then
1323 // don't update call site and let the caller retry.
1324 // Don't update call site if callee nmethod was unloaded or deoptimized.
1325 // Don't update call site if callee nmethod was replaced by an other nmethod
1326 // which may happen when multiply alive nmethod (tiered compilation)
1327 // will be supported.
1328 if (!callee_method->is_old() &&
1329 (callee_nm == NULL || callee_nm->is_in_use() && (callee_method->code() == callee_nm))) {
1330 #ifdef ASSERT
1331 // We must not try to patch to jump to an already unloaded method.
1332 if (dest_entry_point != 0) {
1333 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1334 assert((cb != NULL) && cb->is_nmethod() && (((nmethod*)cb) == callee_nm),
1335 "should not call unloaded nmethod");
1336 }
1337 #endif
1338 if (is_virtual) {
1339 nmethod* nm = callee_nm;
1340 if (nm == NULL) CodeCache::find_blob(caller_frame.pc());
1341 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1342 if (inline_cache->is_clean()) {
1343 inline_cache->set_to_monomorphic(virtual_call_info);
1344 }
1345 } else {
1346 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1347 if (ssc->is_clean()) ssc->set(static_call_info);
1348 }
1349 }
1351 } // unlock CompiledIC_lock
1353 return callee_method;
1354 }
1357 // Inline caches exist only in compiled code
1358 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1359 #ifdef ASSERT
1360 RegisterMap reg_map(thread, false);
1361 frame stub_frame = thread->last_frame();
1362 assert(stub_frame.is_runtime_frame(), "sanity check");
1363 frame caller_frame = stub_frame.sender(®_map);
1364 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1365 #endif /* ASSERT */
1367 methodHandle callee_method;
1368 JRT_BLOCK
1369 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1370 // Return Method* through TLS
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
1379 // Handle call site that has been made non-entrant
1380 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1381 // 6243940 We might end up in here if the callee is deoptimized
1382 // as we race to call it. We don't want to take a safepoint if
1383 // the caller was interpreted because the caller frame will look
1384 // interpreted to the stack walkers and arguments are now
1385 // "compiled" so it is much better to make this transition
1386 // invisible to the stack walking code. The i2c path will
1387 // place the callee method in the callee_target. It is stashed
1388 // there because if we try and find the callee by normal means a
1389 // safepoint is possible and have trouble gc'ing the compiled args.
1390 RegisterMap reg_map(thread, false);
1391 frame stub_frame = thread->last_frame();
1392 assert(stub_frame.is_runtime_frame(), "sanity check");
1393 frame caller_frame = stub_frame.sender(®_map);
1395 if (caller_frame.is_interpreted_frame() ||
1396 caller_frame.is_entry_frame()) {
1397 Method* callee = thread->callee_target();
1398 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1399 thread->set_vm_result_2(callee);
1400 thread->set_callee_target(NULL);
1401 return callee->get_c2i_entry();
1402 }
1404 // Must be compiled to compiled path which is safe to stackwalk
1405 methodHandle callee_method;
1406 JRT_BLOCK
1407 // Force resolving of caller (if we called from compiled frame)
1408 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1409 thread->set_vm_result_2(callee_method());
1410 JRT_BLOCK_END
1411 // return compiled code entry point after potential safepoints
1412 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1413 return callee_method->verified_code_entry();
1414 JRT_END
1416 // Handle abstract method call
1417 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1418 return StubRoutines::throw_AbstractMethodError_entry();
1419 JRT_END
1422 // resolve a static call and patch code
1423 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1424 methodHandle callee_method;
1425 JRT_BLOCK
1426 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1427 thread->set_vm_result_2(callee_method());
1428 JRT_BLOCK_END
1429 // return compiled code entry point after potential safepoints
1430 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1431 return callee_method->verified_code_entry();
1432 JRT_END
1435 // resolve virtual call and update inline cache to monomorphic
1436 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1437 methodHandle callee_method;
1438 JRT_BLOCK
1439 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1440 thread->set_vm_result_2(callee_method());
1441 JRT_BLOCK_END
1442 // return compiled code entry point after potential safepoints
1443 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1444 return callee_method->verified_code_entry();
1445 JRT_END
1448 // Resolve a virtual call that can be statically bound (e.g., always
1449 // monomorphic, so it has no inline cache). Patch code to resolved target.
1450 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1451 methodHandle callee_method;
1452 JRT_BLOCK
1453 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1454 thread->set_vm_result_2(callee_method());
1455 JRT_BLOCK_END
1456 // return compiled code entry point after potential safepoints
1457 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1458 return callee_method->verified_code_entry();
1459 JRT_END
1465 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1466 ResourceMark rm(thread);
1467 CallInfo call_info;
1468 Bytecodes::Code bc;
1470 // receiver is NULL for static calls. An exception is thrown for NULL
1471 // receivers for non-static calls
1472 Handle receiver = find_callee_info(thread, bc, call_info,
1473 CHECK_(methodHandle()));
1474 // Compiler1 can produce virtual call sites that can actually be statically bound
1475 // If we fell thru to below we would think that the site was going megamorphic
1476 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1477 // we'd try and do a vtable dispatch however methods that can be statically bound
1478 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1479 // reresolution of the call site (as if we did a handle_wrong_method and not an
1480 // plain ic_miss) and the site will be converted to an optimized virtual call site
1481 // never to miss again. I don't believe C2 will produce code like this but if it
1482 // did this would still be the correct thing to do for it too, hence no ifdef.
1483 //
1484 if (call_info.resolved_method()->can_be_statically_bound()) {
1485 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1486 if (TraceCallFixup) {
1487 RegisterMap reg_map(thread, false);
1488 frame caller_frame = thread->last_frame().sender(®_map);
1489 ResourceMark rm(thread);
1490 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1491 callee_method->print_short_name(tty);
1492 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());
1493 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1494 }
1495 return callee_method;
1496 }
1498 methodHandle callee_method = call_info.selected_method();
1500 bool should_be_mono = false;
1502 #ifndef PRODUCT
1503 Atomic::inc(&_ic_miss_ctr);
1505 // Statistics & Tracing
1506 if (TraceCallFixup) {
1507 ResourceMark rm(thread);
1508 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1509 callee_method->print_short_name(tty);
1510 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1511 }
1513 if (ICMissHistogram) {
1514 MutexLocker m(VMStatistic_lock);
1515 RegisterMap reg_map(thread, false);
1516 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1517 // produce statistics under the lock
1518 trace_ic_miss(f.pc());
1519 }
1520 #endif
1522 // install an event collector so that when a vtable stub is created the
1523 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1524 // event can't be posted when the stub is created as locks are held
1525 // - instead the event will be deferred until the event collector goes
1526 // out of scope.
1527 JvmtiDynamicCodeEventCollector event_collector;
1529 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1530 { MutexLocker ml_patch (CompiledIC_lock);
1531 RegisterMap reg_map(thread, false);
1532 frame caller_frame = thread->last_frame().sender(®_map);
1533 CodeBlob* cb = caller_frame.cb();
1534 if (cb->is_nmethod()) {
1535 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc());
1536 bool should_be_mono = false;
1537 if (inline_cache->is_optimized()) {
1538 if (TraceCallFixup) {
1539 ResourceMark rm(thread);
1540 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1541 callee_method->print_short_name(tty);
1542 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1543 }
1544 should_be_mono = true;
1545 } else if (inline_cache->is_icholder_call()) {
1546 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1547 if ( ic_oop != NULL) {
1549 if (receiver()->klass() == ic_oop->holder_klass()) {
1550 // This isn't a real miss. We must have seen that compiled code
1551 // is now available and we want the call site converted to a
1552 // monomorphic compiled call site.
1553 // We can't assert for callee_method->code() != NULL because it
1554 // could have been deoptimized in the meantime
1555 if (TraceCallFixup) {
1556 ResourceMark rm(thread);
1557 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1558 callee_method->print_short_name(tty);
1559 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1560 }
1561 should_be_mono = true;
1562 }
1563 }
1564 }
1566 if (should_be_mono) {
1568 // We have a path that was monomorphic but was going interpreted
1569 // and now we have (or had) a compiled entry. We correct the IC
1570 // by using a new icBuffer.
1571 CompiledICInfo info;
1572 KlassHandle receiver_klass(THREAD, receiver()->klass());
1573 inline_cache->compute_monomorphic_entry(callee_method,
1574 receiver_klass,
1575 inline_cache->is_optimized(),
1576 false,
1577 info, CHECK_(methodHandle()));
1578 inline_cache->set_to_monomorphic(info);
1579 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1580 // Potential change to megamorphic
1581 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1582 if (!successful) {
1583 inline_cache->set_to_clean();
1584 }
1585 } else {
1586 // Either clean or megamorphic
1587 }
1588 }
1589 } // Release CompiledIC_lock
1591 return callee_method;
1592 }
1594 //
1595 // Resets a call-site in compiled code so it will get resolved again.
1596 // This routines handles both virtual call sites, optimized virtual call
1597 // sites, and static call sites. Typically used to change a call sites
1598 // destination from compiled to interpreted.
1599 //
1600 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1601 ResourceMark rm(thread);
1602 RegisterMap reg_map(thread, false);
1603 frame stub_frame = thread->last_frame();
1604 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1605 frame caller = stub_frame.sender(®_map);
1607 // Do nothing if the frame isn't a live compiled frame.
1608 // nmethod could be deoptimized by the time we get here
1609 // so no update to the caller is needed.
1611 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1613 address pc = caller.pc();
1615 // Default call_addr is the location of the "basic" call.
1616 // Determine the address of the call we a reresolving. With
1617 // Inline Caches we will always find a recognizable call.
1618 // With Inline Caches disabled we may or may not find a
1619 // recognizable call. We will always find a call for static
1620 // calls and for optimized virtual calls. For vanilla virtual
1621 // calls it depends on the state of the UseInlineCaches switch.
1622 //
1623 // With Inline Caches disabled we can get here for a virtual call
1624 // for two reasons:
1625 // 1 - calling an abstract method. The vtable for abstract methods
1626 // will run us thru handle_wrong_method and we will eventually
1627 // end up in the interpreter to throw the ame.
1628 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1629 // call and between the time we fetch the entry address and
1630 // we jump to it the target gets deoptimized. Similar to 1
1631 // we will wind up in the interprter (thru a c2i with c2).
1632 //
1633 address call_addr = NULL;
1634 {
1635 // Get call instruction under lock because another thread may be
1636 // busy patching it.
1637 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1638 // Location of call instruction
1639 if (NativeCall::is_call_before(pc)) {
1640 NativeCall *ncall = nativeCall_before(pc);
1641 call_addr = ncall->instruction_address();
1642 }
1643 }
1645 // Check for static or virtual call
1646 bool is_static_call = false;
1647 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1648 // Make sure nmethod doesn't get deoptimized and removed until
1649 // this is done with it.
1650 // CLEANUP - with lazy deopt shouldn't need this lock
1651 nmethodLocker nmlock(caller_nm);
1653 if (call_addr != NULL) {
1654 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1655 int ret = iter.next(); // Get item
1656 if (ret) {
1657 assert(iter.addr() == call_addr, "must find call");
1658 if (iter.type() == relocInfo::static_call_type) {
1659 is_static_call = true;
1660 } else {
1661 assert(iter.type() == relocInfo::virtual_call_type ||
1662 iter.type() == relocInfo::opt_virtual_call_type
1663 , "unexpected relocInfo. type");
1664 }
1665 } else {
1666 assert(!UseInlineCaches, "relocation info. must exist for this address");
1667 }
1669 // Cleaning the inline cache will force a new resolve. This is more robust
1670 // than directly setting it to the new destination, since resolving of calls
1671 // is always done through the same code path. (experience shows that it
1672 // leads to very hard to track down bugs, if an inline cache gets updated
1673 // to a wrong method). It should not be performance critical, since the
1674 // resolve is only done once.
1676 MutexLocker ml(CompiledIC_lock);
1677 if (is_static_call) {
1678 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1679 ssc->set_to_clean();
1680 } else {
1681 // compiled, dispatched call (which used to call an interpreted method)
1682 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1683 inline_cache->set_to_clean();
1684 }
1685 }
1687 }
1689 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1692 #ifndef PRODUCT
1693 Atomic::inc(&_wrong_method_ctr);
1695 if (TraceCallFixup) {
1696 ResourceMark rm(thread);
1697 tty->print("handle_wrong_method reresolving call to");
1698 callee_method->print_short_name(tty);
1699 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1700 }
1701 #endif
1703 return callee_method;
1704 }
1706 #ifdef ASSERT
1707 void SharedRuntime::check_member_name_argument_is_last_argument(methodHandle method,
1708 const BasicType* sig_bt,
1709 const VMRegPair* regs) {
1710 ResourceMark rm;
1711 const int total_args_passed = method->size_of_parameters();
1712 const VMRegPair* regs_with_member_name = regs;
1713 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1715 const int member_arg_pos = total_args_passed - 1;
1716 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1717 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1719 const bool is_outgoing = method->is_method_handle_intrinsic();
1720 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1722 for (int i = 0; i < member_arg_pos; i++) {
1723 VMReg a = regs_with_member_name[i].first();
1724 VMReg b = regs_without_member_name[i].first();
1725 assert(a->value() == b->value(), err_msg_res("register allocation mismatch: a=%d, b=%d", a->value(), b->value()));
1726 }
1727 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1728 }
1729 #endif
1731 // ---------------------------------------------------------------------------
1732 // We are calling the interpreter via a c2i. Normally this would mean that
1733 // we were called by a compiled method. However we could have lost a race
1734 // where we went int -> i2c -> c2i and so the caller could in fact be
1735 // interpreted. If the caller is compiled we attempt to patch the caller
1736 // so he no longer calls into the interpreter.
1737 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1738 Method* moop(method);
1740 address entry_point = moop->from_compiled_entry();
1742 // It's possible that deoptimization can occur at a call site which hasn't
1743 // been resolved yet, in which case this function will be called from
1744 // an nmethod that has been patched for deopt and we can ignore the
1745 // request for a fixup.
1746 // Also it is possible that we lost a race in that from_compiled_entry
1747 // is now back to the i2c in that case we don't need to patch and if
1748 // we did we'd leap into space because the callsite needs to use
1749 // "to interpreter" stub in order to load up the Method*. Don't
1750 // ask me how I know this...
1752 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1753 if (cb == NULL || !cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1754 return;
1755 }
1757 // The check above makes sure this is a nmethod.
1758 nmethod* nm = cb->as_nmethod_or_null();
1759 assert(nm, "must be");
1761 // Get the return PC for the passed caller PC.
1762 address return_pc = caller_pc + frame::pc_return_offset;
1764 // There is a benign race here. We could be attempting to patch to a compiled
1765 // entry point at the same time the callee is being deoptimized. If that is
1766 // the case then entry_point may in fact point to a c2i and we'd patch the
1767 // call site with the same old data. clear_code will set code() to NULL
1768 // at the end of it. If we happen to see that NULL then we can skip trying
1769 // to patch. If we hit the window where the callee has a c2i in the
1770 // from_compiled_entry and the NULL isn't present yet then we lose the race
1771 // and patch the code with the same old data. Asi es la vida.
1773 if (moop->code() == NULL) return;
1775 if (nm->is_in_use()) {
1777 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1778 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1779 if (NativeCall::is_call_before(return_pc)) {
1780 NativeCall *call = nativeCall_before(return_pc);
1781 //
1782 // bug 6281185. We might get here after resolving a call site to a vanilla
1783 // virtual call. Because the resolvee uses the verified entry it may then
1784 // see compiled code and attempt to patch the site by calling us. This would
1785 // then incorrectly convert the call site to optimized and its downhill from
1786 // there. If you're lucky you'll get the assert in the bugid, if not you've
1787 // just made a call site that could be megamorphic into a monomorphic site
1788 // for the rest of its life! Just another racing bug in the life of
1789 // fixup_callers_callsite ...
1790 //
1791 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1792 iter.next();
1793 assert(iter.has_current(), "must have a reloc at java call site");
1794 relocInfo::relocType typ = iter.reloc()->type();
1795 if ( typ != relocInfo::static_call_type &&
1796 typ != relocInfo::opt_virtual_call_type &&
1797 typ != relocInfo::static_stub_type) {
1798 return;
1799 }
1800 address destination = call->destination();
1801 if (destination != entry_point) {
1802 CodeBlob* callee = CodeCache::find_blob(destination);
1803 // callee == cb seems weird. It means calling interpreter thru stub.
1804 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) {
1805 // static call or optimized virtual
1806 if (TraceCallFixup) {
1807 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1808 moop->print_short_name(tty);
1809 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1810 }
1811 call->set_destination_mt_safe(entry_point);
1812 } else {
1813 if (TraceCallFixup) {
1814 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1815 moop->print_short_name(tty);
1816 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1817 }
1818 // assert is too strong could also be resolve destinations.
1819 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1820 }
1821 } else {
1822 if (TraceCallFixup) {
1823 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1824 moop->print_short_name(tty);
1825 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1826 }
1827 }
1828 }
1829 }
1830 IRT_END
1833 // same as JVM_Arraycopy, but called directly from compiled code
1834 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1835 oopDesc* dest, jint dest_pos,
1836 jint length,
1837 JavaThread* thread)) {
1838 #ifndef PRODUCT
1839 _slow_array_copy_ctr++;
1840 #endif
1841 // Check if we have null pointers
1842 if (src == NULL || dest == NULL) {
1843 THROW(vmSymbols::java_lang_NullPointerException());
1844 }
1845 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1846 // even though the copy_array API also performs dynamic checks to ensure
1847 // that src and dest are truly arrays (and are conformable).
1848 // The copy_array mechanism is awkward and could be removed, but
1849 // the compilers don't call this function except as a last resort,
1850 // so it probably doesn't matter.
1851 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1852 (arrayOopDesc*)dest, dest_pos,
1853 length, thread);
1854 }
1855 JRT_END
1857 char* SharedRuntime::generate_class_cast_message(
1858 JavaThread* thread, const char* objName) {
1860 // Get target class name from the checkcast instruction
1861 vframeStream vfst(thread, true);
1862 assert(!vfst.at_end(), "Java frame must exist");
1863 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1864 Klass* targetKlass = vfst.method()->constants()->klass_at(
1865 cc.index(), thread);
1866 return generate_class_cast_message(objName, targetKlass->external_name());
1867 }
1869 char* SharedRuntime::generate_class_cast_message(
1870 const char* objName, const char* targetKlassName, const char* desc) {
1871 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1873 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1874 if (NULL == message) {
1875 // Shouldn't happen, but don't cause even more problems if it does
1876 message = const_cast<char*>(objName);
1877 } else {
1878 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1879 }
1880 return message;
1881 }
1883 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1884 (void) JavaThread::current()->reguard_stack();
1885 JRT_END
1888 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1889 #ifndef PRODUCT
1890 int SharedRuntime::_monitor_enter_ctr=0;
1891 #endif
1892 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1893 oop obj(_obj);
1894 #ifndef PRODUCT
1895 _monitor_enter_ctr++; // monitor enter slow
1896 #endif
1897 if (PrintBiasedLockingStatistics) {
1898 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1899 }
1900 Handle h_obj(THREAD, obj);
1901 if (UseBiasedLocking) {
1902 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1903 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1904 } else {
1905 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1906 }
1907 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1908 JRT_END
1910 #ifndef PRODUCT
1911 int SharedRuntime::_monitor_exit_ctr=0;
1912 #endif
1913 // Handles the uncommon cases of monitor unlocking in compiled code
1914 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))
1915 oop obj(_obj);
1916 #ifndef PRODUCT
1917 _monitor_exit_ctr++; // monitor exit slow
1918 #endif
1919 Thread* THREAD = JavaThread::current();
1920 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1921 // testing was unable to ever fire the assert that guarded it so I have removed it.
1922 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1923 #undef MIGHT_HAVE_PENDING
1924 #ifdef MIGHT_HAVE_PENDING
1925 // Save and restore any pending_exception around the exception mark.
1926 // While the slow_exit must not throw an exception, we could come into
1927 // this routine with one set.
1928 oop pending_excep = NULL;
1929 const char* pending_file;
1930 int pending_line;
1931 if (HAS_PENDING_EXCEPTION) {
1932 pending_excep = PENDING_EXCEPTION;
1933 pending_file = THREAD->exception_file();
1934 pending_line = THREAD->exception_line();
1935 CLEAR_PENDING_EXCEPTION;
1936 }
1937 #endif /* MIGHT_HAVE_PENDING */
1939 {
1940 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1941 EXCEPTION_MARK;
1942 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
1943 }
1945 #ifdef MIGHT_HAVE_PENDING
1946 if (pending_excep != NULL) {
1947 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
1948 }
1949 #endif /* MIGHT_HAVE_PENDING */
1950 JRT_END
1952 #ifndef PRODUCT
1954 void SharedRuntime::print_statistics() {
1955 ttyLocker ttyl;
1956 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
1958 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr);
1959 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr);
1960 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
1962 SharedRuntime::print_ic_miss_histogram();
1964 if (CountRemovableExceptions) {
1965 if (_nof_removable_exceptions > 0) {
1966 Unimplemented(); // this counter is not yet incremented
1967 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
1968 }
1969 }
1971 // Dump the JRT_ENTRY counters
1972 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
1973 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);
1974 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
1975 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
1976 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
1977 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
1978 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
1980 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );
1981 tty->print_cr("%5d wrong method", _wrong_method_ctr );
1982 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );
1983 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );
1984 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );
1986 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );
1987 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );
1988 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );
1989 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );
1990 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );
1991 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );
1992 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );
1993 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );
1994 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );
1995 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );
1996 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );
1997 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );
1998 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );
1999 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );
2000 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );
2001 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );
2003 AdapterHandlerLibrary::print_statistics();
2005 if (xtty != NULL) xtty->tail("statistics");
2006 }
2008 inline double percent(int x, int y) {
2009 return 100.0 * x / MAX2(y, 1);
2010 }
2012 class MethodArityHistogram {
2013 public:
2014 enum { MAX_ARITY = 256 };
2015 private:
2016 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2017 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2018 static int _max_arity; // max. arity seen
2019 static int _max_size; // max. arg size seen
2021 static void add_method_to_histogram(nmethod* nm) {
2022 Method* m = nm->method();
2023 ArgumentCount args(m->signature());
2024 int arity = args.size() + (m->is_static() ? 0 : 1);
2025 int argsize = m->size_of_parameters();
2026 arity = MIN2(arity, MAX_ARITY-1);
2027 argsize = MIN2(argsize, MAX_ARITY-1);
2028 int count = nm->method()->compiled_invocation_count();
2029 _arity_histogram[arity] += count;
2030 _size_histogram[argsize] += count;
2031 _max_arity = MAX2(_max_arity, arity);
2032 _max_size = MAX2(_max_size, argsize);
2033 }
2035 void print_histogram_helper(int n, int* histo, const char* name) {
2036 const int N = MIN2(5, n);
2037 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2038 double sum = 0;
2039 double weighted_sum = 0;
2040 int i;
2041 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2042 double rest = sum;
2043 double percent = sum / 100;
2044 for (i = 0; i <= N; i++) {
2045 rest -= histo[i];
2046 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2047 }
2048 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2049 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2050 }
2052 void print_histogram() {
2053 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2054 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2055 tty->print_cr("\nSame for parameter size (in words):");
2056 print_histogram_helper(_max_size, _size_histogram, "size");
2057 tty->cr();
2058 }
2060 public:
2061 MethodArityHistogram() {
2062 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2063 _max_arity = _max_size = 0;
2064 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;
2065 CodeCache::nmethods_do(add_method_to_histogram);
2066 print_histogram();
2067 }
2068 };
2070 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2071 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2072 int MethodArityHistogram::_max_arity;
2073 int MethodArityHistogram::_max_size;
2075 void SharedRuntime::print_call_statistics(int comp_total) {
2076 tty->print_cr("Calls from compiled code:");
2077 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2078 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2079 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2080 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2081 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2082 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2083 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2084 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2085 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2086 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2087 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2088 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2089 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2090 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2091 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2092 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2093 tty->cr();
2094 tty->print_cr("Note 1: counter updates are not MT-safe.");
2095 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2096 tty->print_cr(" %% in nested categories are relative to their category");
2097 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2098 tty->cr();
2100 MethodArityHistogram h;
2101 }
2102 #endif
2105 // A simple wrapper class around the calling convention information
2106 // that allows sharing of adapters for the same calling convention.
2107 class AdapterFingerPrint : public CHeapObj<mtCode> {
2108 private:
2109 enum {
2110 _basic_type_bits = 4,
2111 _basic_type_mask = right_n_bits(_basic_type_bits),
2112 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2113 _compact_int_count = 3
2114 };
2115 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2116 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2118 union {
2119 int _compact[_compact_int_count];
2120 int* _fingerprint;
2121 } _value;
2122 int _length; // A negative length indicates the fingerprint is in the compact form,
2123 // Otherwise _value._fingerprint is the array.
2125 // Remap BasicTypes that are handled equivalently by the adapters.
2126 // These are correct for the current system but someday it might be
2127 // necessary to make this mapping platform dependent.
2128 static int adapter_encoding(BasicType in) {
2129 switch(in) {
2130 case T_BOOLEAN:
2131 case T_BYTE:
2132 case T_SHORT:
2133 case T_CHAR:
2134 // There are all promoted to T_INT in the calling convention
2135 return T_INT;
2137 case T_OBJECT:
2138 case T_ARRAY:
2139 // In other words, we assume that any register good enough for
2140 // an int or long is good enough for a managed pointer.
2141 #ifdef _LP64
2142 return T_LONG;
2143 #else
2144 return T_INT;
2145 #endif
2147 case T_INT:
2148 case T_LONG:
2149 case T_FLOAT:
2150 case T_DOUBLE:
2151 case T_VOID:
2152 return in;
2154 default:
2155 ShouldNotReachHere();
2156 return T_CONFLICT;
2157 }
2158 }
2160 public:
2161 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2162 // The fingerprint is based on the BasicType signature encoded
2163 // into an array of ints with eight entries per int.
2164 int* ptr;
2165 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2166 if (len <= _compact_int_count) {
2167 assert(_compact_int_count == 3, "else change next line");
2168 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2169 // Storing the signature encoded as signed chars hits about 98%
2170 // of the time.
2171 _length = -len;
2172 ptr = _value._compact;
2173 } else {
2174 _length = len;
2175 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2176 ptr = _value._fingerprint;
2177 }
2179 // Now pack the BasicTypes with 8 per int
2180 int sig_index = 0;
2181 for (int index = 0; index < len; index++) {
2182 int value = 0;
2183 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2184 int bt = ((sig_index < total_args_passed)
2185 ? adapter_encoding(sig_bt[sig_index++])
2186 : 0);
2187 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2188 value = (value << _basic_type_bits) | bt;
2189 }
2190 ptr[index] = value;
2191 }
2192 }
2194 ~AdapterFingerPrint() {
2195 if (_length > 0) {
2196 FREE_C_HEAP_ARRAY(int, _value._fingerprint, mtCode);
2197 }
2198 }
2200 int value(int index) {
2201 if (_length < 0) {
2202 return _value._compact[index];
2203 }
2204 return _value._fingerprint[index];
2205 }
2206 int length() {
2207 if (_length < 0) return -_length;
2208 return _length;
2209 }
2211 bool is_compact() {
2212 return _length <= 0;
2213 }
2215 unsigned int compute_hash() {
2216 int hash = 0;
2217 for (int i = 0; i < length(); i++) {
2218 int v = value(i);
2219 hash = (hash << 8) ^ v ^ (hash >> 5);
2220 }
2221 return (unsigned int)hash;
2222 }
2224 const char* as_string() {
2225 stringStream st;
2226 st.print("0x");
2227 for (int i = 0; i < length(); i++) {
2228 st.print("%08x", value(i));
2229 }
2230 return st.as_string();
2231 }
2233 bool equals(AdapterFingerPrint* other) {
2234 if (other->_length != _length) {
2235 return false;
2236 }
2237 if (_length < 0) {
2238 assert(_compact_int_count == 3, "else change next line");
2239 return _value._compact[0] == other->_value._compact[0] &&
2240 _value._compact[1] == other->_value._compact[1] &&
2241 _value._compact[2] == other->_value._compact[2];
2242 } else {
2243 for (int i = 0; i < _length; i++) {
2244 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2245 return false;
2246 }
2247 }
2248 }
2249 return true;
2250 }
2251 };
2254 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2255 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2256 friend class AdapterHandlerTableIterator;
2258 private:
2260 #ifndef PRODUCT
2261 static int _lookups; // number of calls to lookup
2262 static int _buckets; // number of buckets checked
2263 static int _equals; // number of buckets checked with matching hash
2264 static int _hits; // number of successful lookups
2265 static int _compact; // number of equals calls with compact signature
2266 #endif
2268 AdapterHandlerEntry* bucket(int i) {
2269 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2270 }
2272 public:
2273 AdapterHandlerTable()
2274 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { }
2276 // Create a new entry suitable for insertion in the table
2277 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2278 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2279 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2280 return entry;
2281 }
2283 // Insert an entry into the table
2284 void add(AdapterHandlerEntry* entry) {
2285 int index = hash_to_index(entry->hash());
2286 add_entry(index, entry);
2287 }
2289 void free_entry(AdapterHandlerEntry* entry) {
2290 entry->deallocate();
2291 BasicHashtable<mtCode>::free_entry(entry);
2292 }
2294 // Find a entry with the same fingerprint if it exists
2295 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2296 NOT_PRODUCT(_lookups++);
2297 AdapterFingerPrint fp(total_args_passed, sig_bt);
2298 unsigned int hash = fp.compute_hash();
2299 int index = hash_to_index(hash);
2300 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2301 NOT_PRODUCT(_buckets++);
2302 if (e->hash() == hash) {
2303 NOT_PRODUCT(_equals++);
2304 if (fp.equals(e->fingerprint())) {
2305 #ifndef PRODUCT
2306 if (fp.is_compact()) _compact++;
2307 _hits++;
2308 #endif
2309 return e;
2310 }
2311 }
2312 }
2313 return NULL;
2314 }
2316 #ifndef PRODUCT
2317 void print_statistics() {
2318 ResourceMark rm;
2319 int longest = 0;
2320 int empty = 0;
2321 int total = 0;
2322 int nonempty = 0;
2323 for (int index = 0; index < table_size(); index++) {
2324 int count = 0;
2325 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2326 count++;
2327 }
2328 if (count != 0) nonempty++;
2329 if (count == 0) empty++;
2330 if (count > longest) longest = count;
2331 total += count;
2332 }
2333 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2334 empty, longest, total, total / (double)nonempty);
2335 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2336 _lookups, _buckets, _equals, _hits, _compact);
2337 }
2338 #endif
2339 };
2342 #ifndef PRODUCT
2344 int AdapterHandlerTable::_lookups;
2345 int AdapterHandlerTable::_buckets;
2346 int AdapterHandlerTable::_equals;
2347 int AdapterHandlerTable::_hits;
2348 int AdapterHandlerTable::_compact;
2350 #endif
2352 class AdapterHandlerTableIterator : public StackObj {
2353 private:
2354 AdapterHandlerTable* _table;
2355 int _index;
2356 AdapterHandlerEntry* _current;
2358 void scan() {
2359 while (_index < _table->table_size()) {
2360 AdapterHandlerEntry* a = _table->bucket(_index);
2361 _index++;
2362 if (a != NULL) {
2363 _current = a;
2364 return;
2365 }
2366 }
2367 }
2369 public:
2370 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2371 scan();
2372 }
2373 bool has_next() {
2374 return _current != NULL;
2375 }
2376 AdapterHandlerEntry* next() {
2377 if (_current != NULL) {
2378 AdapterHandlerEntry* result = _current;
2379 _current = _current->next();
2380 if (_current == NULL) scan();
2381 return result;
2382 } else {
2383 return NULL;
2384 }
2385 }
2386 };
2389 // ---------------------------------------------------------------------------
2390 // Implementation of AdapterHandlerLibrary
2391 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2392 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2393 const int AdapterHandlerLibrary_size = 16*K;
2394 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2396 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2397 // Should be called only when AdapterHandlerLibrary_lock is active.
2398 if (_buffer == NULL) // Initialize lazily
2399 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2400 return _buffer;
2401 }
2403 void AdapterHandlerLibrary::initialize() {
2404 if (_adapters != NULL) return;
2405 _adapters = new AdapterHandlerTable();
2407 // Create a special handler for abstract methods. Abstract methods
2408 // are never compiled so an i2c entry is somewhat meaningless, but
2409 // throw AbstractMethodError just in case.
2410 // Pass wrong_method_abstract for the c2i transitions to return
2411 // AbstractMethodError for invalid invocations.
2412 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2413 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2414 StubRoutines::throw_AbstractMethodError_entry(),
2415 wrong_method_abstract, wrong_method_abstract);
2416 }
2418 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2419 address i2c_entry,
2420 address c2i_entry,
2421 address c2i_unverified_entry) {
2422 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2423 }
2425 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) {
2426 // Use customized signature handler. Need to lock around updates to
2427 // the AdapterHandlerTable (it is not safe for concurrent readers
2428 // and a single writer: this could be fixed if it becomes a
2429 // problem).
2431 // Get the address of the ic_miss handlers before we grab the
2432 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which
2433 // was caused by the initialization of the stubs happening
2434 // while we held the lock and then notifying jvmti while
2435 // holding it. This just forces the initialization to be a little
2436 // earlier.
2437 address ic_miss = SharedRuntime::get_ic_miss_stub();
2438 assert(ic_miss != NULL, "must have handler");
2440 ResourceMark rm;
2442 NOT_PRODUCT(int insts_size);
2443 AdapterBlob* new_adapter = NULL;
2444 AdapterHandlerEntry* entry = NULL;
2445 AdapterFingerPrint* fingerprint = NULL;
2446 {
2447 MutexLocker mu(AdapterHandlerLibrary_lock);
2448 // make sure data structure is initialized
2449 initialize();
2451 if (method->is_abstract()) {
2452 return _abstract_method_handler;
2453 }
2455 // Fill in the signature array, for the calling-convention call.
2456 int total_args_passed = method->size_of_parameters(); // All args on stack
2458 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2459 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2460 int i = 0;
2461 if (!method->is_static()) // Pass in receiver first
2462 sig_bt[i++] = T_OBJECT;
2463 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2464 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2465 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2466 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2467 }
2468 assert(i == total_args_passed, "");
2470 // Lookup method signature's fingerprint
2471 entry = _adapters->lookup(total_args_passed, sig_bt);
2473 #ifdef ASSERT
2474 AdapterHandlerEntry* shared_entry = NULL;
2475 // Start adapter sharing verification only after the VM is booted.
2476 if (VerifyAdapterSharing && (entry != NULL)) {
2477 shared_entry = entry;
2478 entry = NULL;
2479 }
2480 #endif
2482 if (entry != NULL) {
2483 return entry;
2484 }
2486 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2487 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2489 // Make a C heap allocated version of the fingerprint to store in the adapter
2490 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2492 // StubRoutines::code2() is initialized after this function can be called. As a result,
2493 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2494 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2495 // stub that ensure that an I2C stub is called from an interpreter frame.
2496 bool contains_all_checks = StubRoutines::code2() != NULL;
2498 // Create I2C & C2I handlers
2499 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2500 if (buf != NULL) {
2501 CodeBuffer buffer(buf);
2502 short buffer_locs[20];
2503 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2504 sizeof(buffer_locs)/sizeof(relocInfo));
2506 MacroAssembler _masm(&buffer);
2507 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2508 total_args_passed,
2509 comp_args_on_stack,
2510 sig_bt,
2511 regs,
2512 fingerprint);
2513 #ifdef ASSERT
2514 if (VerifyAdapterSharing) {
2515 if (shared_entry != NULL) {
2516 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2517 // Release the one just created and return the original
2518 _adapters->free_entry(entry);
2519 return shared_entry;
2520 } else {
2521 entry->save_code(buf->code_begin(), buffer.insts_size());
2522 }
2523 }
2524 #endif
2526 new_adapter = AdapterBlob::create(&buffer);
2527 NOT_PRODUCT(insts_size = buffer.insts_size());
2528 }
2529 if (new_adapter == NULL) {
2530 // CodeCache is full, disable compilation
2531 // Ought to log this but compile log is only per compile thread
2532 // and we're some non descript Java thread.
2533 MutexUnlocker mu(AdapterHandlerLibrary_lock);
2534 CompileBroker::handle_full_code_cache();
2535 return NULL; // Out of CodeCache space
2536 }
2537 entry->relocate(new_adapter->content_begin());
2538 #ifndef PRODUCT
2539 // debugging suppport
2540 if (PrintAdapterHandlers || PrintStubCode) {
2541 ttyLocker ttyl;
2542 entry->print_adapter_on(tty);
2543 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2544 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2545 method->signature()->as_C_string(), insts_size);
2546 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
2547 if (Verbose || PrintStubCode) {
2548 address first_pc = entry->base_address();
2549 if (first_pc != NULL) {
2550 Disassembler::decode(first_pc, first_pc + insts_size);
2551 tty->cr();
2552 }
2553 }
2554 }
2555 #endif
2556 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2557 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2558 if (contains_all_checks || !VerifyAdapterCalls) {
2559 _adapters->add(entry);
2560 }
2561 }
2562 // Outside of the lock
2563 if (new_adapter != NULL) {
2564 char blob_id[256];
2565 jio_snprintf(blob_id,
2566 sizeof(blob_id),
2567 "%s(%s)@" PTR_FORMAT,
2568 new_adapter->name(),
2569 fingerprint->as_string(),
2570 new_adapter->content_begin());
2571 Forte::register_stub(blob_id, new_adapter->content_begin(),new_adapter->content_end());
2573 if (JvmtiExport::should_post_dynamic_code_generated()) {
2574 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2575 }
2576 }
2577 return entry;
2578 }
2580 address AdapterHandlerEntry::base_address() {
2581 address base = _i2c_entry;
2582 if (base == NULL) base = _c2i_entry;
2583 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2584 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2585 return base;
2586 }
2588 void AdapterHandlerEntry::relocate(address new_base) {
2589 address old_base = base_address();
2590 assert(old_base != NULL, "");
2591 ptrdiff_t delta = new_base - old_base;
2592 if (_i2c_entry != NULL)
2593 _i2c_entry += delta;
2594 if (_c2i_entry != NULL)
2595 _c2i_entry += delta;
2596 if (_c2i_unverified_entry != NULL)
2597 _c2i_unverified_entry += delta;
2598 assert(base_address() == new_base, "");
2599 }
2602 void AdapterHandlerEntry::deallocate() {
2603 delete _fingerprint;
2604 #ifdef ASSERT
2605 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code, mtCode);
2606 #endif
2607 }
2610 #ifdef ASSERT
2611 // Capture the code before relocation so that it can be compared
2612 // against other versions. If the code is captured after relocation
2613 // then relative instructions won't be equivalent.
2614 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2615 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2616 _saved_code_length = length;
2617 memcpy(_saved_code, buffer, length);
2618 }
2621 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2622 if (length != _saved_code_length) {
2623 return false;
2624 }
2626 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2627 }
2628 #endif
2631 /**
2632 * Create a native wrapper for this native method. The wrapper converts the
2633 * Java-compiled calling convention to the native convention, handles
2634 * arguments, and transitions to native. On return from the native we transition
2635 * back to java blocking if a safepoint is in progress.
2636 */
2637 void AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {
2638 ResourceMark rm;
2639 nmethod* nm = NULL;
2641 assert(method->is_native(), "must be native");
2642 assert(method->is_method_handle_intrinsic() ||
2643 method->has_native_function(), "must have something valid to call!");
2645 {
2646 // Perform the work while holding the lock, but perform any printing outside the lock
2647 MutexLocker mu(AdapterHandlerLibrary_lock);
2648 // See if somebody beat us to it
2649 nm = method->code();
2650 if (nm != NULL) {
2651 return;
2652 }
2654 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2655 assert(compile_id > 0, "Must generate native wrapper");
2658 ResourceMark rm;
2659 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2660 if (buf != NULL) {
2661 CodeBuffer buffer(buf);
2662 double locs_buf[20];
2663 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2664 MacroAssembler _masm(&buffer);
2666 // Fill in the signature array, for the calling-convention call.
2667 const int total_args_passed = method->size_of_parameters();
2669 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2670 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2671 int i=0;
2672 if( !method->is_static() ) // Pass in receiver first
2673 sig_bt[i++] = T_OBJECT;
2674 SignatureStream ss(method->signature());
2675 for( ; !ss.at_return_type(); ss.next()) {
2676 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2677 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2678 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2679 }
2680 assert(i == total_args_passed, "");
2681 BasicType ret_type = ss.type();
2683 // Now get the compiled-Java layout as input (or output) arguments.
2684 // NOTE: Stubs for compiled entry points of method handle intrinsics
2685 // are just trampolines so the argument registers must be outgoing ones.
2686 const bool is_outgoing = method->is_method_handle_intrinsic();
2687 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2689 // Generate the compiled-to-native wrapper code
2690 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2692 if (nm != NULL) {
2693 method->set_code(method, nm);
2694 }
2695 }
2696 } // Unlock AdapterHandlerLibrary_lock
2699 // Install the generated code.
2700 if (nm != NULL) {
2701 if (PrintCompilation) {
2702 ttyLocker ttyl;
2703 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2704 }
2705 nm->post_compiled_method_load_event();
2706 } else {
2707 // CodeCache is full, disable compilation
2708 CompileBroker::handle_full_code_cache();
2709 }
2710 }
2712 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2713 assert(thread == JavaThread::current(), "must be");
2714 // The code is about to enter a JNI lazy critical native method and
2715 // _needs_gc is true, so if this thread is already in a critical
2716 // section then just return, otherwise this thread should block
2717 // until needs_gc has been cleared.
2718 if (thread->in_critical()) {
2719 return;
2720 }
2721 // Lock and unlock a critical section to give the system a chance to block
2722 GC_locker::lock_critical(thread);
2723 GC_locker::unlock_critical(thread);
2724 JRT_END
2726 #ifdef HAVE_DTRACE_H
2727 /**
2728 * Create a dtrace nmethod for this method. The wrapper converts the
2729 * Java-compiled calling convention to the native convention, makes a dummy call
2730 * (actually nops for the size of the call instruction, which become a trap if
2731 * probe is enabled), and finally returns to the caller. Since this all looks like a
2732 * leaf, no thread transition is needed.
2733 */
2734 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
2735 ResourceMark rm;
2736 nmethod* nm = NULL;
2738 if (PrintCompilation) {
2739 ttyLocker ttyl;
2740 tty->print("--- n ");
2741 method->print_short_name(tty);
2742 if (method->is_static()) {
2743 tty->print(" (static)");
2744 }
2745 tty->cr();
2746 }
2748 {
2749 // perform the work while holding the lock, but perform any printing
2750 // outside the lock
2751 MutexLocker mu(AdapterHandlerLibrary_lock);
2752 // See if somebody beat us to it
2753 nm = method->code();
2754 if (nm) {
2755 return nm;
2756 }
2758 ResourceMark rm;
2760 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2761 if (buf != NULL) {
2762 CodeBuffer buffer(buf);
2763 // Need a few relocation entries
2764 double locs_buf[20];
2765 buffer.insts()->initialize_shared_locs(
2766 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2767 MacroAssembler _masm(&buffer);
2769 // Generate the compiled-to-native wrapper code
2770 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
2771 }
2772 }
2773 return nm;
2774 }
2776 // the dtrace method needs to convert java lang string to utf8 string.
2777 void SharedRuntime::get_utf(oopDesc* src, address dst) {
2778 typeArrayOop jlsValue = java_lang_String::value(src);
2779 int jlsOffset = java_lang_String::offset(src);
2780 int jlsLen = java_lang_String::length(src);
2781 jchar* jlsPos = (jlsLen == 0) ? NULL :
2782 jlsValue->char_at_addr(jlsOffset);
2783 assert(TypeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string");
2784 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
2785 }
2786 #endif // ndef HAVE_DTRACE_H
2788 int SharedRuntime::convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt) {
2789 int argcnt = in_args_count;
2790 if (CCallingConventionRequiresIntsAsLongs) {
2791 for (int in = 0; in < in_args_count; in++) {
2792 BasicType bt = in_sig_bt[in];
2793 switch (bt) {
2794 case T_BOOLEAN:
2795 case T_CHAR:
2796 case T_BYTE:
2797 case T_SHORT:
2798 case T_INT:
2799 argcnt++;
2800 break;
2801 default:
2802 break;
2803 }
2804 }
2805 } else {
2806 assert(0, "This should not be needed on this platform");
2807 }
2809 return argcnt;
2810 }
2812 void SharedRuntime::convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
2813 BasicType*& in_sig_bt, VMRegPair*& in_regs) {
2814 if (CCallingConventionRequiresIntsAsLongs) {
2815 VMRegPair *new_in_regs = NEW_RESOURCE_ARRAY(VMRegPair, i2l_argcnt);
2816 BasicType *new_in_sig_bt = NEW_RESOURCE_ARRAY(BasicType, i2l_argcnt);
2818 int argcnt = 0;
2819 for (int in = 0; in < in_args_count; in++, argcnt++) {
2820 BasicType bt = in_sig_bt[in];
2821 VMRegPair reg = in_regs[in];
2822 switch (bt) {
2823 case T_BOOLEAN:
2824 case T_CHAR:
2825 case T_BYTE:
2826 case T_SHORT:
2827 case T_INT:
2828 // Convert (bt) to (T_LONG,bt).
2829 new_in_sig_bt[argcnt ] = T_LONG;
2830 new_in_sig_bt[argcnt+1] = bt;
2831 assert(reg.first()->is_valid() && !reg.second()->is_valid(), "");
2832 new_in_regs[argcnt ].set2(reg.first());
2833 new_in_regs[argcnt+1].set_bad();
2834 argcnt++;
2835 break;
2836 default:
2837 // No conversion needed.
2838 new_in_sig_bt[argcnt] = bt;
2839 new_in_regs[argcnt] = reg;
2840 break;
2841 }
2842 }
2843 assert(argcnt == i2l_argcnt, "must match");
2845 in_regs = new_in_regs;
2846 in_sig_bt = new_in_sig_bt;
2847 in_args_count = i2l_argcnt;
2848 } else {
2849 assert(0, "This should not be needed on this platform");
2850 }
2851 }
2853 // -------------------------------------------------------------------------
2854 // Java-Java calling convention
2855 // (what you use when Java calls Java)
2857 //------------------------------name_for_receiver----------------------------------
2858 // For a given signature, return the VMReg for parameter 0.
2859 VMReg SharedRuntime::name_for_receiver() {
2860 VMRegPair regs;
2861 BasicType sig_bt = T_OBJECT;
2862 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2863 // Return argument 0 register. In the LP64 build pointers
2864 // take 2 registers, but the VM wants only the 'main' name.
2865 return regs.first();
2866 }
2868 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2869 // This method is returning a data structure allocating as a
2870 // ResourceObject, so do not put any ResourceMarks in here.
2871 char *s = sig->as_C_string();
2872 int len = (int)strlen(s);
2873 s++; len--; // Skip opening paren
2875 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );
2876 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );
2877 int cnt = 0;
2878 if (has_receiver) {
2879 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2880 }
2882 while( *s != ')' ) { // Find closing right paren
2883 switch( *s++ ) { // Switch on signature character
2884 case 'B': sig_bt[cnt++] = T_BYTE; break;
2885 case 'C': sig_bt[cnt++] = T_CHAR; break;
2886 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2887 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2888 case 'I': sig_bt[cnt++] = T_INT; break;
2889 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2890 case 'S': sig_bt[cnt++] = T_SHORT; break;
2891 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2892 case 'V': sig_bt[cnt++] = T_VOID; break;
2893 case 'L': // Oop
2894 while( *s++ != ';' ) ; // Skip signature
2895 sig_bt[cnt++] = T_OBJECT;
2896 break;
2897 case '[': { // Array
2898 do { // Skip optional size
2899 while( *s >= '0' && *s <= '9' ) s++;
2900 } while( *s++ == '[' ); // Nested arrays?
2901 // Skip element type
2902 if( s[-1] == 'L' )
2903 while( *s++ != ';' ) ; // Skip signature
2904 sig_bt[cnt++] = T_ARRAY;
2905 break;
2906 }
2907 default : ShouldNotReachHere();
2908 }
2909 }
2911 if (has_appendix) {
2912 sig_bt[cnt++] = T_OBJECT;
2913 }
2915 assert( cnt < 256, "grow table size" );
2917 int comp_args_on_stack;
2918 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2920 // the calling convention doesn't count out_preserve_stack_slots so
2921 // we must add that in to get "true" stack offsets.
2923 if (comp_args_on_stack) {
2924 for (int i = 0; i < cnt; i++) {
2925 VMReg reg1 = regs[i].first();
2926 if( reg1->is_stack()) {
2927 // Yuck
2928 reg1 = reg1->bias(out_preserve_stack_slots());
2929 }
2930 VMReg reg2 = regs[i].second();
2931 if( reg2->is_stack()) {
2932 // Yuck
2933 reg2 = reg2->bias(out_preserve_stack_slots());
2934 }
2935 regs[i].set_pair(reg2, reg1);
2936 }
2937 }
2939 // results
2940 *arg_size = cnt;
2941 return regs;
2942 }
2944 // OSR Migration Code
2945 //
2946 // This code is used convert interpreter frames into compiled frames. It is
2947 // called from very start of a compiled OSR nmethod. A temp array is
2948 // allocated to hold the interesting bits of the interpreter frame. All
2949 // active locks are inflated to allow them to move. The displaced headers and
2950 // active interpeter locals are copied into the temp buffer. Then we return
2951 // back to the compiled code. The compiled code then pops the current
2952 // interpreter frame off the stack and pushes a new compiled frame. Then it
2953 // copies the interpreter locals and displaced headers where it wants.
2954 // Finally it calls back to free the temp buffer.
2955 //
2956 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2958 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2960 //
2961 // This code is dependent on the memory layout of the interpreter local
2962 // array and the monitors. On all of our platforms the layout is identical
2963 // so this code is shared. If some platform lays the their arrays out
2964 // differently then this code could move to platform specific code or
2965 // the code here could be modified to copy items one at a time using
2966 // frame accessor methods and be platform independent.
2968 frame fr = thread->last_frame();
2969 assert( fr.is_interpreted_frame(), "" );
2970 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );
2972 // Figure out how many monitors are active.
2973 int active_monitor_count = 0;
2974 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2975 kptr < fr.interpreter_frame_monitor_begin();
2976 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2977 if( kptr->obj() != NULL ) active_monitor_count++;
2978 }
2980 // QQQ we could place number of active monitors in the array so that compiled code
2981 // could double check it.
2983 Method* moop = fr.interpreter_frame_method();
2984 int max_locals = moop->max_locals();
2985 // Allocate temp buffer, 1 word per local & 2 per active monitor
2986 int buf_size_words = max_locals + active_monitor_count*2;
2987 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2989 // Copy the locals. Order is preserved so that loading of longs works.
2990 // Since there's no GC I can copy the oops blindly.
2991 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2992 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2993 (HeapWord*)&buf[0],
2994 max_locals);
2996 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2997 int i = max_locals;
2998 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2999 kptr2 < fr.interpreter_frame_monitor_begin();
3000 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3001 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
3002 BasicLock *lock = kptr2->lock();
3003 // Inflate so the displaced header becomes position-independent
3004 if (lock->displaced_header()->is_unlocked())
3005 ObjectSynchronizer::inflate_helper(kptr2->obj());
3006 // Now the displaced header is free to move
3007 buf[i++] = (intptr_t)lock->displaced_header();
3008 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3009 }
3010 }
3011 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );
3013 return buf;
3014 JRT_END
3016 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3017 FREE_C_HEAP_ARRAY(intptr_t,buf, mtCode);
3018 JRT_END
3020 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
3021 AdapterHandlerTableIterator iter(_adapters);
3022 while (iter.has_next()) {
3023 AdapterHandlerEntry* a = iter.next();
3024 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
3025 }
3026 return false;
3027 }
3029 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) {
3030 AdapterHandlerTableIterator iter(_adapters);
3031 while (iter.has_next()) {
3032 AdapterHandlerEntry* a = iter.next();
3033 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3034 st->print("Adapter for signature: ");
3035 a->print_adapter_on(tty);
3036 return;
3037 }
3038 }
3039 assert(false, "Should have found handler");
3040 }
3042 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3043 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
3044 (intptr_t) this, fingerprint()->as_string(),
3045 get_i2c_entry(), get_c2i_entry(), get_c2i_unverified_entry());
3047 }
3049 #ifndef PRODUCT
3051 void AdapterHandlerLibrary::print_statistics() {
3052 _adapters->print_statistics();
3053 }
3055 #endif /* PRODUCT */