Mon, 25 May 2020 14:24:27 +0800
8244407: JVM crashes after transformation in C2 IdealLoopTree::split_fall_in
Reviewed-by: thartmann, kvn, andrew
Contributed-by: zhouyong44@huawei.com
1 /*
2 * Copyright (c) 1998, 2016, 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.
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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).
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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.
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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
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23 */
25 #include "precompiled.hpp"
26 #include "ci/ciCallSite.hpp"
27 #include "ci/ciMethodHandle.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "opto/addnode.hpp"
33 #include "opto/callGenerator.hpp"
34 #include "opto/cfgnode.hpp"
35 #include "opto/mulnode.hpp"
36 #include "opto/parse.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39 #include "opto/subnode.hpp"
40 #include "prims/nativeLookup.hpp"
41 #include "runtime/sharedRuntime.hpp"
43 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
44 if (TraceTypeProfile || C->print_inlining()) {
45 outputStream* out = tty;
46 if (!C->print_inlining()) {
47 if (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) {
48 method->print_short_name();
49 tty->cr();
50 }
51 CompileTask::print_inlining(prof_method, depth, bci);
52 } else {
53 out = C->print_inlining_stream();
54 }
55 CompileTask::print_inline_indent(depth, out);
56 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
57 stringStream ss;
58 prof_klass->name()->print_symbol_on(&ss);
59 out->print("%s", ss.as_string());
60 out->cr();
61 }
62 }
64 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
65 JVMState* jvms, bool allow_inline,
66 float prof_factor, ciKlass* speculative_receiver_type,
67 bool allow_intrinsics, bool delayed_forbidden) {
68 ciMethod* caller = jvms->method();
69 int bci = jvms->bci();
70 Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
71 guarantee(callee != NULL, "failed method resolution");
73 // Dtrace currently doesn't work unless all calls are vanilla
74 if (env()->dtrace_method_probes()) {
75 allow_inline = false;
76 }
78 // Note: When we get profiling during stage-1 compiles, we want to pull
79 // from more specific profile data which pertains to this inlining.
80 // Right now, ignore the information in jvms->caller(), and do method[bci].
81 ciCallProfile profile = caller->call_profile_at_bci(bci);
83 // See how many times this site has been invoked.
84 int site_count = profile.count();
85 int receiver_count = -1;
86 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
87 // Receivers in the profile structure are ordered by call counts
88 // so that the most called (major) receiver is profile.receiver(0).
89 receiver_count = profile.receiver_count(0);
90 }
92 CompileLog* log = this->log();
93 if (log != NULL) {
94 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
95 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
96 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
97 log->identify(callee), site_count, prof_factor);
98 if (call_does_dispatch) log->print(" virtual='1'");
99 if (allow_inline) log->print(" inline='1'");
100 if (receiver_count >= 0) {
101 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
102 if (profile.has_receiver(1)) {
103 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
104 }
105 }
106 log->end_elem();
107 }
109 // Special case the handling of certain common, profitable library
110 // methods. If these methods are replaced with specialized code,
111 // then we return it as the inlined version of the call.
112 // We do this before the strict f.p. check below because the
113 // intrinsics handle strict f.p. correctly.
114 CallGenerator* cg_intrinsic = NULL;
115 if (allow_inline && allow_intrinsics) {
116 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
117 if (cg != NULL) {
118 if (cg->is_predicated()) {
119 // Code without intrinsic but, hopefully, inlined.
120 CallGenerator* inline_cg = this->call_generator(callee,
121 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
122 if (inline_cg != NULL) {
123 cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
124 }
125 }
127 // If intrinsic does the virtual dispatch, we try to use the type profile
128 // first, and hopefully inline it as the regular virtual call below.
129 // We will retry the intrinsic if nothing had claimed it afterwards.
130 if (cg->does_virtual_dispatch()) {
131 cg_intrinsic = cg;
132 cg = NULL;
133 } else {
134 return cg;
135 }
136 }
137 }
139 // Do method handle calls.
140 // NOTE: This must happen before normal inlining logic below since
141 // MethodHandle.invoke* are native methods which obviously don't
142 // have bytecodes and so normal inlining fails.
143 if (callee->is_method_handle_intrinsic()) {
144 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden);
145 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator");
146 return cg;
147 }
149 // Do not inline strict fp into non-strict code, or the reverse
150 if (caller->is_strict() ^ callee->is_strict()) {
151 allow_inline = false;
152 }
154 // Attempt to inline...
155 if (allow_inline) {
156 // The profile data is only partly attributable to this caller,
157 // scale back the call site information.
158 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
159 // This is the number of times we expect the call code to be used.
160 float expected_uses = past_uses;
162 // Try inlining a bytecoded method:
163 if (!call_does_dispatch) {
164 InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
165 WarmCallInfo scratch_ci;
166 bool should_delay = false;
167 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay);
168 assert(ci != &scratch_ci, "do not let this pointer escape");
169 bool allow_inline = (ci != NULL && !ci->is_cold());
170 bool require_inline = (allow_inline && ci->is_hot());
172 if (allow_inline) {
173 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
175 if (require_inline && cg != NULL) {
176 // Delay the inlining of this method to give us the
177 // opportunity to perform some high level optimizations
178 // first.
179 if (should_delay_string_inlining(callee, jvms)) {
180 assert(!delayed_forbidden, "strange");
181 return CallGenerator::for_string_late_inline(callee, cg);
182 } else if (should_delay_boxing_inlining(callee, jvms)) {
183 assert(!delayed_forbidden, "strange");
184 return CallGenerator::for_boxing_late_inline(callee, cg);
185 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) {
186 return CallGenerator::for_late_inline(callee, cg);
187 }
188 }
189 if (cg == NULL || should_delay) {
190 // Fall through.
191 } else if (require_inline || !InlineWarmCalls) {
192 return cg;
193 } else {
194 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor);
195 return CallGenerator::for_warm_call(ci, cold_cg, cg);
196 }
197 }
198 }
200 // Try using the type profile.
201 if (call_does_dispatch && site_count > 0 && receiver_count > 0) {
202 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
203 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
204 ciMethod* receiver_method = NULL;
206 int morphism = profile.morphism();
207 if (speculative_receiver_type != NULL) {
208 if (!too_many_traps(caller, bci, Deoptimization::Reason_speculate_class_check)) {
209 // We have a speculative type, we should be able to resolve
210 // the call. We do that before looking at the profiling at
211 // this invoke because it may lead to bimorphic inlining which
212 // a speculative type should help us avoid.
213 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
214 speculative_receiver_type);
215 if (receiver_method == NULL) {
216 speculative_receiver_type = NULL;
217 } else {
218 morphism = 1;
219 }
220 } else {
221 // speculation failed before. Use profiling at the call
222 // (could allow bimorphic inlining for instance).
223 speculative_receiver_type = NULL;
224 }
225 }
226 if (receiver_method == NULL &&
227 (have_major_receiver || morphism == 1 ||
228 (morphism == 2 && UseBimorphicInlining))) {
229 // receiver_method = profile.method();
230 // Profiles do not suggest methods now. Look it up in the major receiver.
231 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
232 profile.receiver(0));
233 }
234 if (receiver_method != NULL) {
235 // The single majority receiver sufficiently outweighs the minority.
236 CallGenerator* hit_cg = this->call_generator(receiver_method,
237 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
238 if (hit_cg != NULL) {
239 // Look up second receiver.
240 CallGenerator* next_hit_cg = NULL;
241 ciMethod* next_receiver_method = NULL;
242 if (morphism == 2 && UseBimorphicInlining) {
243 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
244 profile.receiver(1));
245 if (next_receiver_method != NULL) {
246 next_hit_cg = this->call_generator(next_receiver_method,
247 vtable_index, !call_does_dispatch, jvms,
248 allow_inline, prof_factor);
249 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
250 have_major_receiver && UseOnlyInlinedBimorphic) {
251 // Skip if we can't inline second receiver's method
252 next_hit_cg = NULL;
253 }
254 }
255 }
256 CallGenerator* miss_cg;
257 Deoptimization::DeoptReason reason = morphism == 2 ?
258 Deoptimization::Reason_bimorphic :
259 (speculative_receiver_type == NULL ? Deoptimization::Reason_class_check : Deoptimization::Reason_speculate_class_check);
260 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
261 !too_many_traps(caller, bci, reason)
262 ) {
263 // Generate uncommon trap for class check failure path
264 // in case of monomorphic or bimorphic virtual call site.
265 miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
266 Deoptimization::Action_maybe_recompile);
267 } else {
268 // Generate virtual call for class check failure path
269 // in case of polymorphic virtual call site.
270 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index);
271 }
272 if (miss_cg != NULL) {
273 if (next_hit_cg != NULL) {
274 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
275 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
276 // We don't need to record dependency on a receiver here and below.
277 // Whenever we inline, the dependency is added by Parse::Parse().
278 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
279 }
280 if (miss_cg != NULL) {
281 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count);
282 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
283 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
284 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
285 if (cg != NULL) return cg;
286 }
287 }
288 }
289 }
290 }
291 }
293 // Nothing claimed the intrinsic, we go with straight-forward inlining
294 // for already discovered intrinsic.
295 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) {
296 assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
297 return cg_intrinsic;
298 }
300 // There was no special inlining tactic, or it bailed out.
301 // Use a more generic tactic, like a simple call.
302 if (call_does_dispatch) {
303 return CallGenerator::for_virtual_call(callee, vtable_index);
304 } else {
305 // Class Hierarchy Analysis or Type Profile reveals a unique target,
306 // or it is a static or special call.
307 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
308 }
309 }
311 // Return true for methods that shouldn't be inlined early so that
312 // they are easier to analyze and optimize as intrinsics.
313 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
314 if (has_stringbuilder()) {
316 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
317 call_method->holder() == C->env()->StringBuffer_klass()) &&
318 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
319 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
320 // Delay SB calls only when called from non-SB code
321 return false;
322 }
324 switch (call_method->intrinsic_id()) {
325 case vmIntrinsics::_StringBuilder_void:
326 case vmIntrinsics::_StringBuilder_int:
327 case vmIntrinsics::_StringBuilder_String:
328 case vmIntrinsics::_StringBuilder_append_char:
329 case vmIntrinsics::_StringBuilder_append_int:
330 case vmIntrinsics::_StringBuilder_append_String:
331 case vmIntrinsics::_StringBuilder_toString:
332 case vmIntrinsics::_StringBuffer_void:
333 case vmIntrinsics::_StringBuffer_int:
334 case vmIntrinsics::_StringBuffer_String:
335 case vmIntrinsics::_StringBuffer_append_char:
336 case vmIntrinsics::_StringBuffer_append_int:
337 case vmIntrinsics::_StringBuffer_append_String:
338 case vmIntrinsics::_StringBuffer_toString:
339 case vmIntrinsics::_Integer_toString:
340 return true;
342 case vmIntrinsics::_String_String:
343 {
344 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
345 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
346 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
347 ciMethod* m = csj->method();
348 if (m != NULL &&
349 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
350 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
351 // Delay String.<init>(new SB())
352 return true;
353 }
354 return false;
355 }
357 default:
358 return false;
359 }
360 }
361 return false;
362 }
364 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
365 if (eliminate_boxing() && call_method->is_boxing_method()) {
366 set_has_boxed_value(true);
367 return aggressive_unboxing();
368 }
369 return false;
370 }
372 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
373 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
374 // Additional inputs to consider...
375 // bc = bc()
376 // caller = method()
377 // iter().get_method_holder_index()
378 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
379 // Interface classes can be loaded & linked and never get around to
380 // being initialized. Uncommon-trap for not-initialized static or
381 // v-calls. Let interface calls happen.
382 ciInstanceKlass* holder_klass = dest_method->holder();
383 if (!holder_klass->is_being_initialized() &&
384 !holder_klass->is_initialized() &&
385 !holder_klass->is_interface()) {
386 uncommon_trap(Deoptimization::Reason_uninitialized,
387 Deoptimization::Action_reinterpret,
388 holder_klass);
389 return true;
390 }
392 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
393 return false;
394 }
397 //------------------------------do_call----------------------------------------
398 // Handle your basic call. Inline if we can & want to, else just setup call.
399 void Parse::do_call() {
400 // It's likely we are going to add debug info soon.
401 // Also, if we inline a guy who eventually needs debug info for this JVMS,
402 // our contribution to it is cleaned up right here.
403 kill_dead_locals();
405 // Set frequently used booleans
406 const bool is_virtual = bc() == Bytecodes::_invokevirtual;
407 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
408 const bool has_receiver = Bytecodes::has_receiver(bc());
410 // Find target being called
411 bool will_link;
412 ciSignature* declared_signature = NULL;
413 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
414 ciInstanceKlass* holder_klass = orig_callee->holder();
415 ciKlass* holder = iter().get_declared_method_holder();
416 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
417 assert(declared_signature != NULL, "cannot be null");
419 // Bump max node limit for JSR292 users
420 if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
421 C->set_max_node_limit(3*MaxNodeLimit);
422 }
424 // uncommon-trap when callee is unloaded, uninitialized or will not link
425 // bailout when too many arguments for register representation
426 if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
427 #ifndef PRODUCT
428 if (PrintOpto && (Verbose || WizardMode)) {
429 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
430 orig_callee->print_name(); tty->cr();
431 }
432 #endif
433 return;
434 }
435 assert(holder_klass->is_loaded(), "");
436 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
437 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
438 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
439 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
440 // Note: In the absence of miranda methods, an abstract class K can perform
441 // an invokevirtual directly on an interface method I.m if K implements I.
443 // orig_callee is the resolved callee which's signature includes the
444 // appendix argument.
445 const int nargs = orig_callee->arg_size();
446 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
448 // Push appendix argument (MethodType, CallSite, etc.), if one.
449 if (iter().has_appendix()) {
450 ciObject* appendix_arg = iter().get_appendix();
451 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg);
452 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
453 push(appendix_arg_node);
454 }
456 // ---------------------
457 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
458 // Then we may inline or make a static call, but become dependent on there being only 1 target.
459 // Does the call-site type profile reveal only one receiver?
460 // Then we may introduce a run-time check and inline on the path where it succeeds.
461 // The other path may uncommon_trap, check for another receiver, or do a v-call.
463 // Try to get the most accurate receiver type
464 ciMethod* callee = orig_callee;
465 int vtable_index = Method::invalid_vtable_index;
466 bool call_does_dispatch = false;
468 // Speculative type of the receiver if any
469 ciKlass* speculative_receiver_type = NULL;
470 if (is_virtual_or_interface) {
471 Node* receiver_node = stack(sp() - nargs);
472 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
473 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
474 // For arrays, klass below is Object. When vtable calls are used,
475 // resolving the call with Object would allow an illegal call to
476 // finalize() on an array. We use holder instead: illegal calls to
477 // finalize() won't be compiled as vtable calls (IC call
478 // resolution will catch the illegal call) and the few legal calls
479 // on array types won't be either.
480 callee = C->optimize_virtual_call(method(), bci(), klass, holder, orig_callee,
481 receiver_type, is_virtual,
482 call_does_dispatch, vtable_index); // out-parameters
483 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
484 }
486 // invoke-super-special
487 if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
488 ciInstanceKlass* calling_klass = method()->holder();
489 ciInstanceKlass* sender_klass =
490 calling_klass->is_anonymous() ? calling_klass->host_klass() :
491 calling_klass;
492 if (sender_klass->is_interface()) {
493 Node* receiver_node = stack(sp() - nargs);
494 Node* cls_node = makecon(TypeKlassPtr::make(sender_klass));
495 Node* bad_type_ctrl = NULL;
496 Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
497 if (bad_type_ctrl != NULL) {
498 PreserveJVMState pjvms(this);
499 set_control(bad_type_ctrl);
500 uncommon_trap(Deoptimization::Reason_class_check,
501 Deoptimization::Action_none);
502 }
503 if (stopped()) {
504 return; // MUST uncommon-trap?
505 }
506 set_stack(sp() - nargs, casted_receiver);
507 }
508 }
510 // Note: It's OK to try to inline a virtual call.
511 // The call generator will not attempt to inline a polymorphic call
512 // unless it knows how to optimize the receiver dispatch.
513 bool try_inline = (C->do_inlining() || InlineAccessors);
515 // ---------------------
516 dec_sp(nargs); // Temporarily pop args for JVM state of call
517 JVMState* jvms = sync_jvms();
519 // ---------------------
520 // Decide call tactic.
521 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
522 // It decides whether inlining is desirable or not.
523 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
525 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
526 orig_callee = callee = NULL;
528 // ---------------------
529 // Round double arguments before call
530 round_double_arguments(cg->method());
532 // Feed profiling data for arguments to the type system so it can
533 // propagate it as speculative types
534 record_profiled_arguments_for_speculation(cg->method(), bc());
536 #ifndef PRODUCT
537 // bump global counters for calls
538 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
540 // Record first part of parsing work for this call
541 parse_histogram()->record_change();
542 #endif // not PRODUCT
544 assert(jvms == this->jvms(), "still operating on the right JVMS");
545 assert(jvms_in_sync(), "jvms must carry full info into CG");
547 // save across call, for a subsequent cast_not_null.
548 Node* receiver = has_receiver ? argument(0) : NULL;
550 // The extra CheckCastPP for speculative types mess with PhaseStringOpts
551 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) {
552 // Feed profiling data for a single receiver to the type system so
553 // it can propagate it as a speculative type
554 receiver = record_profiled_receiver_for_speculation(receiver);
555 }
557 // Bump method data counters (We profile *before* the call is made
558 // because exceptions don't return to the call site.)
559 profile_call(receiver);
561 JVMState* new_jvms = cg->generate(jvms);
562 if (new_jvms == NULL) {
563 // When inlining attempt fails (e.g., too many arguments),
564 // it may contaminate the current compile state, making it
565 // impossible to pull back and try again. Once we call
566 // cg->generate(), we are committed. If it fails, the whole
567 // compilation task is compromised.
568 if (failing()) return;
570 // This can happen if a library intrinsic is available, but refuses
571 // the call site, perhaps because it did not match a pattern the
572 // intrinsic was expecting to optimize. Should always be possible to
573 // get a normal java call that may inline in that case
574 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
575 if ((new_jvms = cg->generate(jvms)) == NULL) {
576 guarantee(failing(), "call failed to generate: calls should work");
577 return;
578 }
579 }
581 if (cg->is_inline()) {
582 // Accumulate has_loops estimate
583 C->set_has_loops(C->has_loops() || cg->method()->has_loops());
584 C->env()->notice_inlined_method(cg->method());
585 }
587 // Reset parser state from [new_]jvms, which now carries results of the call.
588 // Return value (if any) is already pushed on the stack by the cg.
589 add_exception_states_from(new_jvms);
590 if (new_jvms->map()->control() == top()) {
591 stop_and_kill_map();
592 } else {
593 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
594 set_jvms(new_jvms);
595 }
597 if (!stopped()) {
598 // This was some sort of virtual call, which did a null check for us.
599 // Now we can assert receiver-not-null, on the normal return path.
600 if (receiver != NULL && cg->is_virtual()) {
601 Node* cast = cast_not_null(receiver);
602 // %%% assert(receiver == cast, "should already have cast the receiver");
603 }
605 // Round double result after a call from strict to non-strict code
606 round_double_result(cg->method());
608 ciType* rtype = cg->method()->return_type();
609 ciType* ctype = declared_signature->return_type();
611 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
612 // Be careful here with return types.
613 if (ctype != rtype) {
614 BasicType rt = rtype->basic_type();
615 BasicType ct = ctype->basic_type();
616 if (ct == T_VOID) {
617 // It's OK for a method to return a value that is discarded.
618 // The discarding does not require any special action from the caller.
619 // The Java code knows this, at VerifyType.isNullConversion.
620 pop_node(rt); // whatever it was, pop it
621 } else if (rt == T_INT || is_subword_type(rt)) {
622 // Nothing. These cases are handled in lambda form bytecode.
623 assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct)));
624 } else if (rt == T_OBJECT || rt == T_ARRAY) {
625 assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct)));
626 if (ctype->is_loaded()) {
627 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
628 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
629 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
630 Node* retnode = pop();
631 Node* cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), retnode, sig_type));
632 push(cast_obj);
633 }
634 }
635 } else {
636 assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct)));
637 // push a zero; it's better than getting an oop/int mismatch
638 pop_node(rt);
639 Node* retnode = zerocon(ct);
640 push_node(ct, retnode);
641 }
642 // Now that the value is well-behaved, continue with the call-site type.
643 rtype = ctype;
644 }
645 } else {
646 // Symbolic resolution enforces the types to be the same.
647 // NOTE: We must relax the assert for unloaded types because two
648 // different ciType instances of the same unloaded class type
649 // can appear to be "loaded" by different loaders (depending on
650 // the accessing class).
651 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
652 err_msg_res("mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name()));
653 }
655 // If the return type of the method is not loaded, assert that the
656 // value we got is a null. Otherwise, we need to recompile.
657 if (!rtype->is_loaded()) {
658 #ifndef PRODUCT
659 if (PrintOpto && (Verbose || WizardMode)) {
660 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
661 cg->method()->print_name(); tty->cr();
662 }
663 #endif
664 if (C->log() != NULL) {
665 C->log()->elem("assert_null reason='return' klass='%d'",
666 C->log()->identify(rtype));
667 }
668 // If there is going to be a trap, put it at the next bytecode:
669 set_bci(iter().next_bci());
670 null_assert(peek());
671 set_bci(iter().cur_bci()); // put it back
672 }
673 BasicType ct = ctype->basic_type();
674 if (ct == T_OBJECT || ct == T_ARRAY) {
675 ciKlass* better_type = method()->return_profiled_type(bci());
676 if (UseTypeSpeculation && better_type != NULL) {
677 // If profiling reports a single type for the return value,
678 // feed it to the type system so it can propagate it as a
679 // speculative type
680 record_profile_for_speculation(stack(sp()-1), better_type);
681 }
682 }
683 }
685 // Restart record of parsing work after possible inlining of call
686 #ifndef PRODUCT
687 parse_histogram()->set_initial_state(bc());
688 #endif
689 }
691 //---------------------------catch_call_exceptions-----------------------------
692 // Put a Catch and CatchProj nodes behind a just-created call.
693 // Send their caught exceptions to the proper handler.
694 // This may be used after a call to the rethrow VM stub,
695 // when it is needed to process unloaded exception classes.
696 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
697 // Exceptions are delivered through this channel:
698 Node* i_o = this->i_o();
700 // Add a CatchNode.
701 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
702 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
703 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
705 for (; !handlers.is_done(); handlers.next()) {
706 ciExceptionHandler* h = handlers.handler();
707 int h_bci = h->handler_bci();
708 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
709 // Do not introduce unloaded exception types into the graph:
710 if (!h_klass->is_loaded()) {
711 if (saw_unloaded->contains(h_bci)) {
712 /* We've already seen an unloaded exception with h_bci,
713 so don't duplicate. Duplication will cause the CatchNode to be
714 unnecessarily large. See 4713716. */
715 continue;
716 } else {
717 saw_unloaded->append(h_bci);
718 }
719 }
720 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
721 // (We use make_from_klass because it respects UseUniqueSubclasses.)
722 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
723 assert(!h_extype->empty(), "sanity");
724 // Note: It's OK if the BCIs repeat themselves.
725 bcis->append(h_bci);
726 extypes->append(h_extype);
727 }
729 int len = bcis->length();
730 CatchNode *cn = new (C) CatchNode(control(), i_o, len+1);
731 Node *catch_ = _gvn.transform(cn);
733 // now branch with the exception state to each of the (potential)
734 // handlers
735 for(int i=0; i < len; i++) {
736 // Setup JVM state to enter the handler.
737 PreserveJVMState pjvms(this);
738 // Locals are just copied from before the call.
739 // Get control from the CatchNode.
740 int handler_bci = bcis->at(i);
741 Node* ctrl = _gvn.transform( new (C) CatchProjNode(catch_, i+1,handler_bci));
742 // This handler cannot happen?
743 if (ctrl == top()) continue;
744 set_control(ctrl);
746 // Create exception oop
747 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
748 Node *ex_oop = _gvn.transform(new (C) CreateExNode(extypes->at(i), ctrl, i_o));
750 // Handle unloaded exception classes.
751 if (saw_unloaded->contains(handler_bci)) {
752 // An unloaded exception type is coming here. Do an uncommon trap.
753 #ifndef PRODUCT
754 // We do not expect the same handler bci to take both cold unloaded
755 // and hot loaded exceptions. But, watch for it.
756 if ((Verbose || WizardMode) && extype->is_loaded()) {
757 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
758 method()->print_name(); tty->cr();
759 } else if (PrintOpto && (Verbose || WizardMode)) {
760 tty->print("Bailing out on unloaded exception type ");
761 extype->klass()->print_name();
762 tty->print(" at bci:%d in ", bci());
763 method()->print_name(); tty->cr();
764 }
765 #endif
766 // Emit an uncommon trap instead of processing the block.
767 set_bci(handler_bci);
768 push_ex_oop(ex_oop);
769 uncommon_trap(Deoptimization::Reason_unloaded,
770 Deoptimization::Action_reinterpret,
771 extype->klass(), "!loaded exception");
772 set_bci(iter().cur_bci()); // put it back
773 continue;
774 }
776 // go to the exception handler
777 if (handler_bci < 0) { // merge with corresponding rethrow node
778 throw_to_exit(make_exception_state(ex_oop));
779 } else { // Else jump to corresponding handle
780 push_ex_oop(ex_oop); // Clear stack and push just the oop.
781 merge_exception(handler_bci);
782 }
783 }
785 // The first CatchProj is for the normal return.
786 // (Note: If this is a call to rethrow_Java, this node goes dead.)
787 set_control(_gvn.transform( new (C) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
788 }
791 //----------------------------catch_inline_exceptions--------------------------
792 // Handle all exceptions thrown by an inlined method or individual bytecode.
793 // Common case 1: we have no handler, so all exceptions merge right into
794 // the rethrow case.
795 // Case 2: we have some handlers, with loaded exception klasses that have
796 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
797 // exception oop and branch to the handler directly.
798 // Case 3: We have some handlers with subklasses or are not loaded at
799 // compile-time. We have to call the runtime to resolve the exception.
800 // So we insert a RethrowCall and all the logic that goes with it.
801 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
802 // Caller is responsible for saving away the map for normal control flow!
803 assert(stopped(), "call set_map(NULL) first");
804 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
806 Node* ex_node = saved_ex_oop(ex_map);
807 if (ex_node == top()) {
808 // No action needed.
809 return;
810 }
811 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
812 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
813 if (ex_type == NULL)
814 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
816 // determine potential exception handlers
817 ciExceptionHandlerStream handlers(method(), bci(),
818 ex_type->klass()->as_instance_klass(),
819 ex_type->klass_is_exact());
821 // Start executing from the given throw state. (Keep its stack, for now.)
822 // Get the exception oop as known at compile time.
823 ex_node = use_exception_state(ex_map);
825 // Get the exception oop klass from its header
826 Node* ex_klass_node = NULL;
827 if (has_ex_handler() && !ex_type->klass_is_exact()) {
828 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
829 ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
831 // Compute the exception klass a little more cleverly.
832 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
833 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
834 // each arm of the Phi. If I know something clever about the exceptions
835 // I'm loading the class from, I can replace the LoadKlass with the
836 // klass constant for the exception oop.
837 if (ex_node->is_Phi()) {
838 ex_klass_node = new (C) PhiNode(ex_node->in(0), TypeKlassPtr::OBJECT);
839 for (uint i = 1; i < ex_node->req(); i++) {
840 Node* ex_in = ex_node->in(i);
841 if (ex_in == top() || ex_in == NULL) {
842 // This path was not taken.
843 ex_klass_node->init_req(i, top());
844 continue;
845 }
846 Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
847 Node* k = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT));
848 ex_klass_node->init_req( i, k );
849 }
850 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
852 }
853 }
855 // Scan the exception table for applicable handlers.
856 // If none, we can call rethrow() and be done!
857 // If precise (loaded with no subklasses), insert a D.S. style
858 // pointer compare to the correct handler and loop back.
859 // If imprecise, switch to the Rethrow VM-call style handling.
861 int remaining = handlers.count_remaining();
863 // iterate through all entries sequentially
864 for (;!handlers.is_done(); handlers.next()) {
865 ciExceptionHandler* handler = handlers.handler();
867 if (handler->is_rethrow()) {
868 // If we fell off the end of the table without finding an imprecise
869 // exception klass (and without finding a generic handler) then we
870 // know this exception is not handled in this method. We just rethrow
871 // the exception into the caller.
872 throw_to_exit(make_exception_state(ex_node));
873 return;
874 }
876 // exception handler bci range covers throw_bci => investigate further
877 int handler_bci = handler->handler_bci();
879 if (remaining == 1) {
880 push_ex_oop(ex_node); // Push exception oop for handler
881 #ifndef PRODUCT
882 if (PrintOpto && WizardMode) {
883 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
884 }
885 #endif
886 merge_exception(handler_bci); // jump to handler
887 return; // No more handling to be done here!
888 }
890 // Get the handler's klass
891 ciInstanceKlass* klass = handler->catch_klass();
893 if (!klass->is_loaded()) { // klass is not loaded?
894 // fall through into catch_call_exceptions which will emit a
895 // handler with an uncommon trap.
896 break;
897 }
899 if (klass->is_interface()) // should not happen, but...
900 break; // bail out
902 // Check the type of the exception against the catch type
903 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
904 Node* con = _gvn.makecon(tk);
905 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
906 if (!stopped()) {
907 PreserveJVMState pjvms(this);
908 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
909 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
910 Node* ex_oop = _gvn.transform(new (C) CheckCastPPNode(control(), ex_node, tinst));
911 push_ex_oop(ex_oop); // Push exception oop for handler
912 #ifndef PRODUCT
913 if (PrintOpto && WizardMode) {
914 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
915 klass->print_name();
916 tty->cr();
917 }
918 #endif
919 merge_exception(handler_bci);
920 }
921 set_control(not_subtype_ctrl);
923 // Come here if exception does not match handler.
924 // Carry on with more handler checks.
925 --remaining;
926 }
928 assert(!stopped(), "you should return if you finish the chain");
930 // Oops, need to call into the VM to resolve the klasses at runtime.
931 // Note: This call must not deoptimize, since it is not a real at this bci!
932 kill_dead_locals();
934 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
935 OptoRuntime::rethrow_Type(),
936 OptoRuntime::rethrow_stub(),
937 NULL, NULL,
938 ex_node);
940 // Rethrow is a pure call, no side effects, only a result.
941 // The result cannot be allocated, so we use I_O
943 // Catch exceptions from the rethrow
944 catch_call_exceptions(handlers);
945 }
948 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
951 #ifndef PRODUCT
952 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
953 if( CountCompiledCalls ) {
954 if( at_method_entry ) {
955 // bump invocation counter if top method (for statistics)
956 if (CountCompiledCalls && depth() == 1) {
957 const TypePtr* addr_type = TypeMetadataPtr::make(method());
958 Node* adr1 = makecon(addr_type);
959 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
960 increment_counter(adr2);
961 }
962 } else if (is_inline) {
963 switch (bc()) {
964 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
965 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
966 case Bytecodes::_invokestatic:
967 case Bytecodes::_invokedynamic:
968 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
969 default: fatal("unexpected call bytecode");
970 }
971 } else {
972 switch (bc()) {
973 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
974 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
975 case Bytecodes::_invokestatic:
976 case Bytecodes::_invokedynamic:
977 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
978 default: fatal("unexpected call bytecode");
979 }
980 }
981 }
982 }
983 #endif //PRODUCT
986 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
987 ciKlass* holder, ciMethod* callee,
988 const TypeOopPtr* receiver_type, bool is_virtual,
989 bool& call_does_dispatch, int& vtable_index,
990 bool check_access) {
991 // Set default values for out-parameters.
992 call_does_dispatch = true;
993 vtable_index = Method::invalid_vtable_index;
995 // Choose call strategy.
996 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee,
997 receiver_type, check_access);
999 // Have the call been sufficiently improved such that it is no longer a virtual?
1000 if (optimized_virtual_method != NULL) {
1001 callee = optimized_virtual_method;
1002 call_does_dispatch = false;
1003 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1004 // We can make a vtable call at this site
1005 vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1006 }
1007 return callee;
1008 }
1010 // Identify possible target method and inlining style
1011 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
1012 ciMethod* callee, const TypeOopPtr* receiver_type,
1013 bool check_access) {
1014 // only use for virtual or interface calls
1016 // If it is obviously final, do not bother to call find_monomorphic_target,
1017 // because the class hierarchy checks are not needed, and may fail due to
1018 // incompletely loaded classes. Since we do our own class loading checks
1019 // in this module, we may confidently bind to any method.
1020 if (callee->can_be_statically_bound()) {
1021 return callee;
1022 }
1024 // Attempt to improve the receiver
1025 bool actual_receiver_is_exact = false;
1026 ciInstanceKlass* actual_receiver = klass;
1027 if (receiver_type != NULL) {
1028 // Array methods are all inherited from Object, and are monomorphic.
1029 // finalize() call on array is not allowed.
1030 if (receiver_type->isa_aryptr() &&
1031 callee->holder() == env()->Object_klass() &&
1032 callee->name() != ciSymbol::finalize_method_name()) {
1033 return callee;
1034 }
1036 // All other interesting cases are instance klasses.
1037 if (!receiver_type->isa_instptr()) {
1038 return NULL;
1039 }
1041 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
1042 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
1043 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
1044 // ikl is a same or better type than the original actual_receiver,
1045 // e.g. static receiver from bytecodes.
1046 actual_receiver = ikl;
1047 // Is the actual_receiver exact?
1048 actual_receiver_is_exact = receiver_type->klass_is_exact();
1049 }
1050 }
1052 ciInstanceKlass* calling_klass = caller->holder();
1053 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1054 if (cha_monomorphic_target != NULL) {
1055 assert(!cha_monomorphic_target->is_abstract(), "");
1056 // Look at the method-receiver type. Does it add "too much information"?
1057 ciKlass* mr_klass = cha_monomorphic_target->holder();
1058 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
1059 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
1060 // Calling this method would include an implicit cast to its holder.
1061 // %%% Not yet implemented. Would throw minor asserts at present.
1062 // %%% The most common wins are already gained by +UseUniqueSubclasses.
1063 // To fix, put the higher_equal check at the call of this routine,
1064 // and add a CheckCastPP to the receiver.
1065 if (TraceDependencies) {
1066 tty->print_cr("found unique CHA method, but could not cast up");
1067 tty->print(" method = ");
1068 cha_monomorphic_target->print();
1069 tty->cr();
1070 }
1071 if (log() != NULL) {
1072 log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
1073 log()->identify(klass),
1074 log()->identify(cha_monomorphic_target));
1075 }
1076 cha_monomorphic_target = NULL;
1077 }
1078 }
1079 if (cha_monomorphic_target != NULL) {
1080 // Hardwiring a virtual.
1081 // If we inlined because CHA revealed only a single target method,
1082 // then we are dependent on that target method not getting overridden
1083 // by dynamic class loading. Be sure to test the "static" receiver
1084 // dest_method here, as opposed to the actual receiver, which may
1085 // falsely lead us to believe that the receiver is final or private.
1086 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
1087 return cha_monomorphic_target;
1088 }
1090 // If the type is exact, we can still bind the method w/o a vcall.
1091 // (This case comes after CHA so we can see how much extra work it does.)
1092 if (actual_receiver_is_exact) {
1093 // In case of evolution, there is a dependence on every inlined method, since each
1094 // such method can be changed when its class is redefined.
1095 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1096 if (exact_method != NULL) {
1097 #ifndef PRODUCT
1098 if (PrintOpto) {
1099 tty->print(" Calling method via exact type @%d --- ", bci);
1100 exact_method->print_name();
1101 tty->cr();
1102 }
1103 #endif
1104 return exact_method;
1105 }
1106 }
1108 return NULL;
1109 }