1 /*
2 * Copyright (c) 1998, 2011, 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 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciCPCache.hpp"
27 #include "ci/ciCallSite.hpp"
28 #include "ci/ciMethodHandle.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compileLog.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "opto/addnode.hpp"
34 #include "opto/callGenerator.hpp"
35 #include "opto/cfgnode.hpp"
36 #include "opto/mulnode.hpp"
37 #include "opto/parse.hpp"
38 #include "opto/rootnode.hpp"
39 #include "opto/runtime.hpp"
40 #include "opto/subnode.hpp"
41 #include "prims/nativeLookup.hpp"
42 #include "runtime/sharedRuntime.hpp"
43
44 #ifndef PRODUCT
45 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
46 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) {
47 if (!PrintInlining) {
48 if (!PrintOpto && !PrintCompilation) {
49 method->print_short_name();
50 tty->cr();
51 }
52 CompileTask::print_inlining(prof_method, depth, bci);
53 }
54 CompileTask::print_inline_indent(depth);
55 tty->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
56 prof_klass->name()->print_symbol();
57 tty->cr();
58 }
59 }
60 #endif
61
62 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual,
63 JVMState* jvms, bool allow_inline,
64 float prof_factor) {
65 CallGenerator* cg;
66 guarantee(call_method != NULL, "failed method resolution");
67
68 // Dtrace currently doesn't work unless all calls are vanilla
69 if (env()->dtrace_method_probes()) {
70 allow_inline = false;
71 }
72
73 // Note: When we get profiling during stage-1 compiles, we want to pull
74 // from more specific profile data which pertains to this inlining.
75 // Right now, ignore the information in jvms->caller(), and do method[bci].
76 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci());
77
78 // See how many times this site has been invoked.
79 int site_count = profile.count();
80 int receiver_count = -1;
81 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
82 // Receivers in the profile structure are ordered by call counts
83 // so that the most called (major) receiver is profile.receiver(0).
84 receiver_count = profile.receiver_count(0);
85 }
86
87 CompileLog* log = this->log();
88 if (log != NULL) {
89 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
90 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
91 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
92 log->identify(call_method), site_count, prof_factor);
93 if (call_is_virtual) log->print(" virtual='1'");
94 if (allow_inline) log->print(" inline='1'");
95 if (receiver_count >= 0) {
96 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
97 if (profile.has_receiver(1)) {
98 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
99 }
100 }
101 log->end_elem();
102 }
103
104 // Special case the handling of certain common, profitable library
105 // methods. If these methods are replaced with specialized code,
106 // then we return it as the inlined version of the call.
107 // We do this before the strict f.p. check below because the
108 // intrinsics handle strict f.p. correctly.
109 if (allow_inline) {
110 cg = find_intrinsic(call_method, call_is_virtual);
111 if (cg != NULL) return cg;
112 }
113
114 // Do MethodHandle calls.
115 // NOTE: This must happen before normal inlining logic below since
116 // MethodHandle.invoke* are native methods which obviously don't
117 // have bytecodes and so normal inlining fails.
118 if (call_method->is_method_handle_invoke()) {
119 if (jvms->method()->java_code_at_bci(jvms->bci()) != Bytecodes::_invokedynamic) {
120 GraphKit kit(jvms);
121 Node* n = kit.argument(0);
122
123 if (n->Opcode() == Op_ConP) {
124 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr();
125 ciObject* const_oop = oop_ptr->const_oop();
126 ciMethodHandle* method_handle = const_oop->as_method_handle();
127
128 // Set the actually called method to have access to the class
129 // and signature in the MethodHandleCompiler.
130 method_handle->set_callee(call_method);
131
132 // Get an adapter for the MethodHandle.
133 ciMethod* target_method = method_handle->get_method_handle_adapter();
134 CallGenerator* hit_cg = NULL;
135 if (target_method != NULL)
136 hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
137 if (hit_cg != NULL && hit_cg->is_inline())
138 return hit_cg;
139 }
140
141 return CallGenerator::for_direct_call(call_method);
142 }
143 else {
144 // Get the MethodHandle from the CallSite.
145 ciMethod* caller_method = jvms->method();
146 ciBytecodeStream str(caller_method);
147 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci.
148 ciCallSite* call_site = str.get_call_site();
149 ciMethodHandle* method_handle = call_site->get_target();
150
151 // Set the actually called method to have access to the class
152 // and signature in the MethodHandleCompiler.
153 method_handle->set_callee(call_method);
154
155 // Get an adapter for the MethodHandle.
156 ciMethod* target_method = method_handle->get_invokedynamic_adapter();
157 CallGenerator* hit_cg = NULL;
158 if (target_method != NULL)
159 hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
160 if (hit_cg != NULL && hit_cg->is_inline()) {
161 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method);
162 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor);
163 }
164
165 // If something failed, generate a normal dynamic call.
166 return CallGenerator::for_dynamic_call(call_method);
167 }
168 }
169
170 // Do not inline strict fp into non-strict code, or the reverse
171 bool caller_method_is_strict = jvms->method()->is_strict();
172 if( caller_method_is_strict ^ call_method->is_strict() ) {
173 allow_inline = false;
174 }
175
176 // Attempt to inline...
177 if (allow_inline) {
178 // The profile data is only partly attributable to this caller,
179 // scale back the call site information.
180 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
181 // This is the number of times we expect the call code to be used.
182 float expected_uses = past_uses;
183
184 // Try inlining a bytecoded method:
185 if (!call_is_virtual) {
186 InlineTree* ilt;
187 if (UseOldInlining) {
188 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
189 } else {
190 // Make a disembodied, stateless ILT.
191 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
192 float site_invoke_ratio = prof_factor;
193 // Note: ilt is for the root of this parse, not the present call site.
194 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0);
195 }
196 WarmCallInfo scratch_ci;
197 if (!UseOldInlining)
198 scratch_ci.init(jvms, call_method, profile, prof_factor);
199 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
200 assert(ci != &scratch_ci, "do not let this pointer escape");
201 bool allow_inline = (ci != NULL && !ci->is_cold());
202 bool require_inline = (allow_inline && ci->is_hot());
203
204 if (allow_inline) {
205 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
206 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) {
207 // Delay the inlining of this method to give us the
208 // opportunity to perform some high level optimizations
209 // first.
210 return CallGenerator::for_late_inline(call_method, cg);
211 }
212 if (cg == NULL) {
213 // Fall through.
214 } else if (require_inline || !InlineWarmCalls) {
215 return cg;
216 } else {
217 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
218 return CallGenerator::for_warm_call(ci, cold_cg, cg);
219 }
220 }
221 }
222
223 // Try using the type profile.
224 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
225 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
226 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
227 ciMethod* receiver_method = NULL;
228 if (have_major_receiver || profile.morphism() == 1 ||
229 (profile.morphism() == 2 && UseBimorphicInlining)) {
230 // receiver_method = profile.method();
231 // Profiles do not suggest methods now. Look it up in the major receiver.
232 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
233 profile.receiver(0));
234 }
235 if (receiver_method != NULL) {
236 // The single majority receiver sufficiently outweighs the minority.
237 CallGenerator* hit_cg = this->call_generator(receiver_method,
238 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
239 if (hit_cg != NULL) {
240 // Look up second receiver.
241 CallGenerator* next_hit_cg = NULL;
242 ciMethod* next_receiver_method = NULL;
243 if (profile.morphism() == 2 && UseBimorphicInlining) {
244 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
245 profile.receiver(1));
246 if (next_receiver_method != NULL) {
247 next_hit_cg = this->call_generator(next_receiver_method,
248 vtable_index, !call_is_virtual, jvms,
249 allow_inline, prof_factor);
250 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
251 have_major_receiver && UseOnlyInlinedBimorphic) {
252 // Skip if we can't inline second receiver's method
253 next_hit_cg = NULL;
254 }
255 }
256 }
257 CallGenerator* miss_cg;
258 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
259 Deoptimization::Reason_bimorphic :
260 Deoptimization::Reason_class_check;
261 if (( profile.morphism() == 1 ||
262 (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
263 !too_many_traps(jvms->method(), jvms->bci(), reason)
264 ) {
265 // Generate uncommon trap for class check failure path
266 // in case of monomorphic or bimorphic virtual call site.
267 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason,
268 Deoptimization::Action_maybe_recompile);
269 } else {
270 // Generate virtual call for class check failure path
271 // in case of polymorphic virtual call site.
272 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
273 }
274 if (miss_cg != NULL) {
275 if (next_hit_cg != NULL) {
276 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
277 // We don't need to record dependency on a receiver here and below.
278 // Whenever we inline, the dependency is added by Parse::Parse().
279 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
280 }
281 if (miss_cg != NULL) {
282 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
283 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
284 if (cg != NULL) return cg;
285 }
286 }
287 }
288 }
289 }
290 }
291
292 // There was no special inlining tactic, or it bailed out.
293 // Use a more generic tactic, like a simple call.
294 if (call_is_virtual) {
295 return CallGenerator::for_virtual_call(call_method, vtable_index);
296 } else {
297 // Class Hierarchy Analysis or Type Profile reveals a unique target,
298 // or it is a static or special call.
299 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms));
300 }
301 }
302
303 // Return true for methods that shouldn't be inlined early so that
304 // they are easier to analyze and optimize as intrinsics.
305 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
306 if (has_stringbuilder()) {
307
308 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
309 call_method->holder() == C->env()->StringBuffer_klass()) &&
310 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
311 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
312 // Delay SB calls only when called from non-SB code
313 return false;
314 }
315
316 switch (call_method->intrinsic_id()) {
317 case vmIntrinsics::_StringBuilder_void:
318 case vmIntrinsics::_StringBuilder_int:
319 case vmIntrinsics::_StringBuilder_String:
320 case vmIntrinsics::_StringBuilder_append_char:
321 case vmIntrinsics::_StringBuilder_append_int:
322 case vmIntrinsics::_StringBuilder_append_String:
323 case vmIntrinsics::_StringBuilder_toString:
324 case vmIntrinsics::_StringBuffer_void:
325 case vmIntrinsics::_StringBuffer_int:
326 case vmIntrinsics::_StringBuffer_String:
327 case vmIntrinsics::_StringBuffer_append_char:
328 case vmIntrinsics::_StringBuffer_append_int:
329 case vmIntrinsics::_StringBuffer_append_String:
330 case vmIntrinsics::_StringBuffer_toString:
331 case vmIntrinsics::_Integer_toString:
332 return true;
333
334 case vmIntrinsics::_String_String:
335 {
336 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
337 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
338 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
339 ciMethod* m = csj->method();
340 if (m != NULL &&
341 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
342 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
343 // Delay String.<init>(new SB())
344 return true;
345 }
346 return false;
347 }
348
349 default:
350 return false;
351 }
352 }
353 return false;
354 }
355
356
357 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
358 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
359 // Additional inputs to consider...
360 // bc = bc()
361 // caller = method()
362 // iter().get_method_holder_index()
363 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
364 // Interface classes can be loaded & linked and never get around to
365 // being initialized. Uncommon-trap for not-initialized static or
366 // v-calls. Let interface calls happen.
367 ciInstanceKlass* holder_klass = dest_method->holder();
368 if (!holder_klass->is_being_initialized() &&
369 !holder_klass->is_initialized() &&
370 !holder_klass->is_interface()) {
371 uncommon_trap(Deoptimization::Reason_uninitialized,
372 Deoptimization::Action_reinterpret,
373 holder_klass);
374 return true;
375 }
376
377 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
378 return false;
379 }
380
381
382 //------------------------------do_call----------------------------------------
383 // Handle your basic call. Inline if we can & want to, else just setup call.
384 void Parse::do_call() {
385 // It's likely we are going to add debug info soon.
386 // Also, if we inline a guy who eventually needs debug info for this JVMS,
387 // our contribution to it is cleaned up right here.
388 kill_dead_locals();
389
390 // Set frequently used booleans
391 bool is_virtual = bc() == Bytecodes::_invokevirtual;
392 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
393 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
394 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic;
395
396 // Find target being called
397 bool will_link;
398 ciMethod* dest_method = iter().get_method(will_link);
399 ciInstanceKlass* holder_klass = dest_method->holder();
400 ciKlass* holder = iter().get_declared_method_holder();
401 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
402
403 int nargs = dest_method->arg_size();
404 if (is_invokedynamic) nargs -= 1;
405
406 // uncommon-trap when callee is unloaded, uninitialized or will not link
407 // bailout when too many arguments for register representation
408 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
409 #ifndef PRODUCT
410 if (PrintOpto && (Verbose || WizardMode)) {
411 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
412 dest_method->print_name(); tty->cr();
413 }
414 #endif
415 return;
416 }
417 assert(holder_klass->is_loaded(), "");
418 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc");
419 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
420 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
421 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
422 // Note: In the absence of miranda methods, an abstract class K can perform
423 // an invokevirtual directly on an interface method I.m if K implements I.
424
425 // ---------------------
426 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
427 // Then we may inline or make a static call, but become dependent on there being only 1 target.
428 // Does the call-site type profile reveal only one receiver?
429 // Then we may introduce a run-time check and inline on the path where it succeeds.
430 // The other path may uncommon_trap, check for another receiver, or do a v-call.
431
432 // Choose call strategy.
433 bool call_is_virtual = is_virtual_or_interface;
434 int vtable_index = methodOopDesc::invalid_vtable_index;
435 ciMethod* call_method = dest_method;
436
437 // Try to get the most accurate receiver type
438 if (is_virtual_or_interface) {
439 Node* receiver_node = stack(sp() - nargs);
440 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
441 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
442
443 // Have the call been sufficiently improved such that it is no longer a virtual?
444 if (optimized_virtual_method != NULL) {
445 call_method = optimized_virtual_method;
446 call_is_virtual = false;
447 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
448 // We can make a vtable call at this site
449 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
450 }
451 }
452
453 // Note: It's OK to try to inline a virtual call.
454 // The call generator will not attempt to inline a polymorphic call
455 // unless it knows how to optimize the receiver dispatch.
456 bool try_inline = (C->do_inlining() || InlineAccessors);
457
458 // ---------------------
459 inc_sp(- nargs); // Temporarily pop args for JVM state of call
460 JVMState* jvms = sync_jvms();
461
462 // ---------------------
463 // Decide call tactic.
464 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
465 // It decides whether inlining is desirable or not.
466 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
467
468 // ---------------------
469 // Round double arguments before call
470 round_double_arguments(dest_method);
471
472 #ifndef PRODUCT
473 // bump global counters for calls
474 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
475
476 // Record first part of parsing work for this call
477 parse_histogram()->record_change();
478 #endif // not PRODUCT
479
480 assert(jvms == this->jvms(), "still operating on the right JVMS");
481 assert(jvms_in_sync(), "jvms must carry full info into CG");
482
483 // save across call, for a subsequent cast_not_null.
484 Node* receiver = has_receiver ? argument(0) : NULL;
485
486 // Bump method data counters (We profile *before* the call is made
487 // because exceptions don't return to the call site.)
488 profile_call(receiver);
489
490 JVMState* new_jvms;
491 if ((new_jvms = cg->generate(jvms)) == NULL) {
492 // When inlining attempt fails (e.g., too many arguments),
493 // it may contaminate the current compile state, making it
494 // impossible to pull back and try again. Once we call
495 // cg->generate(), we are committed. If it fails, the whole
496 // compilation task is compromised.
497 if (failing()) return;
498 #ifndef PRODUCT
499 if (PrintOpto || PrintOptoInlining || PrintInlining) {
500 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
501 if (cg->is_intrinsic() && call_method->code_size() > 0) {
502 tty->print("Bailed out of intrinsic, will not inline: ");
503 call_method->print_name(); tty->cr();
504 }
505 }
506 #endif
507 // This can happen if a library intrinsic is available, but refuses
508 // the call site, perhaps because it did not match a pattern the
509 // intrinsic was expecting to optimize. The fallback position is
510 // to call out-of-line.
511 try_inline = false; // Inline tactic bailed out.
512 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
513 if ((new_jvms = cg->generate(jvms)) == NULL) {
514 guarantee(failing(), "call failed to generate: calls should work");
515 return;
516 }
517 }
518
519 if (cg->is_inline()) {
520 // Accumulate has_loops estimate
521 C->set_has_loops(C->has_loops() || call_method->has_loops());
522 C->env()->notice_inlined_method(call_method);
523 }
524
525 // Reset parser state from [new_]jvms, which now carries results of the call.
526 // Return value (if any) is already pushed on the stack by the cg.
527 add_exception_states_from(new_jvms);
528 if (new_jvms->map()->control() == top()) {
529 stop_and_kill_map();
530 } else {
531 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
532 set_jvms(new_jvms);
533 }
534
535 if (!stopped()) {
536 // This was some sort of virtual call, which did a null check for us.
537 // Now we can assert receiver-not-null, on the normal return path.
538 if (receiver != NULL && cg->is_virtual()) {
539 Node* cast = cast_not_null(receiver);
540 // %%% assert(receiver == cast, "should already have cast the receiver");
541 }
542
543 // Round double result after a call from strict to non-strict code
544 round_double_result(dest_method);
545
546 // If the return type of the method is not loaded, assert that the
547 // value we got is a null. Otherwise, we need to recompile.
548 if (!dest_method->return_type()->is_loaded()) {
549 #ifndef PRODUCT
550 if (PrintOpto && (Verbose || WizardMode)) {
551 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
552 dest_method->print_name(); tty->cr();
553 }
554 #endif
555 if (C->log() != NULL) {
556 C->log()->elem("assert_null reason='return' klass='%d'",
557 C->log()->identify(dest_method->return_type()));
558 }
559 // If there is going to be a trap, put it at the next bytecode:
560 set_bci(iter().next_bci());
561 do_null_assert(peek(), T_OBJECT);
562 set_bci(iter().cur_bci()); // put it back
563 }
564 }
565
566 // Restart record of parsing work after possible inlining of call
567 #ifndef PRODUCT
568 parse_histogram()->set_initial_state(bc());
569 #endif
570 }
571
572 //---------------------------catch_call_exceptions-----------------------------
573 // Put a Catch and CatchProj nodes behind a just-created call.
574 // Send their caught exceptions to the proper handler.
575 // This may be used after a call to the rethrow VM stub,
576 // when it is needed to process unloaded exception classes.
577 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
578 // Exceptions are delivered through this channel:
579 Node* i_o = this->i_o();
580
581 // Add a CatchNode.
582 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
583 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
584 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
585
586 for (; !handlers.is_done(); handlers.next()) {
587 ciExceptionHandler* h = handlers.handler();
588 int h_bci = h->handler_bci();
589 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
590 // Do not introduce unloaded exception types into the graph:
591 if (!h_klass->is_loaded()) {
592 if (saw_unloaded->contains(h_bci)) {
593 /* We've already seen an unloaded exception with h_bci,
594 so don't duplicate. Duplication will cause the CatchNode to be
595 unnecessarily large. See 4713716. */
596 continue;
597 } else {
598 saw_unloaded->append(h_bci);
599 }
600 }
601 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
602 // (We use make_from_klass because it respects UseUniqueSubclasses.)
603 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
604 assert(!h_extype->empty(), "sanity");
605 // Note: It's OK if the BCIs repeat themselves.
606 bcis->append(h_bci);
607 extypes->append(h_extype);
608 }
609
610 int len = bcis->length();
611 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
612 Node *catch_ = _gvn.transform(cn);
613
614 // now branch with the exception state to each of the (potential)
615 // handlers
616 for(int i=0; i < len; i++) {
617 // Setup JVM state to enter the handler.
618 PreserveJVMState pjvms(this);
619 // Locals are just copied from before the call.
620 // Get control from the CatchNode.
621 int handler_bci = bcis->at(i);
622 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
623 // This handler cannot happen?
624 if (ctrl == top()) continue;
625 set_control(ctrl);
626
627 // Create exception oop
628 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
629 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
630
631 // Handle unloaded exception classes.
632 if (saw_unloaded->contains(handler_bci)) {
633 // An unloaded exception type is coming here. Do an uncommon trap.
634 #ifndef PRODUCT
635 // We do not expect the same handler bci to take both cold unloaded
636 // and hot loaded exceptions. But, watch for it.
637 if (extype->is_loaded()) {
638 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
639 method()->print_name(); tty->cr();
640 } else if (PrintOpto && (Verbose || WizardMode)) {
641 tty->print("Bailing out on unloaded exception type ");
642 extype->klass()->print_name();
643 tty->print(" at bci:%d in ", bci());
644 method()->print_name(); tty->cr();
645 }
646 #endif
647 // Emit an uncommon trap instead of processing the block.
648 set_bci(handler_bci);
649 push_ex_oop(ex_oop);
650 uncommon_trap(Deoptimization::Reason_unloaded,
651 Deoptimization::Action_reinterpret,
652 extype->klass(), "!loaded exception");
653 set_bci(iter().cur_bci()); // put it back
654 continue;
655 }
656
657 // go to the exception handler
658 if (handler_bci < 0) { // merge with corresponding rethrow node
659 throw_to_exit(make_exception_state(ex_oop));
660 } else { // Else jump to corresponding handle
661 push_ex_oop(ex_oop); // Clear stack and push just the oop.
662 merge_exception(handler_bci);
663 }
664 }
665
666 // The first CatchProj is for the normal return.
667 // (Note: If this is a call to rethrow_Java, this node goes dead.)
668 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
669 }
670
671
672 //----------------------------catch_inline_exceptions--------------------------
673 // Handle all exceptions thrown by an inlined method or individual bytecode.
674 // Common case 1: we have no handler, so all exceptions merge right into
675 // the rethrow case.
676 // Case 2: we have some handlers, with loaded exception klasses that have
677 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
678 // exception oop and branch to the handler directly.
679 // Case 3: We have some handlers with subklasses or are not loaded at
680 // compile-time. We have to call the runtime to resolve the exception.
681 // So we insert a RethrowCall and all the logic that goes with it.
682 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
683 // Caller is responsible for saving away the map for normal control flow!
684 assert(stopped(), "call set_map(NULL) first");
685 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
686
687 Node* ex_node = saved_ex_oop(ex_map);
688 if (ex_node == top()) {
689 // No action needed.
690 return;
691 }
692 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
693 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
694 if (ex_type == NULL)
695 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
696
697 // determine potential exception handlers
698 ciExceptionHandlerStream handlers(method(), bci(),
699 ex_type->klass()->as_instance_klass(),
700 ex_type->klass_is_exact());
701
702 // Start executing from the given throw state. (Keep its stack, for now.)
703 // Get the exception oop as known at compile time.
704 ex_node = use_exception_state(ex_map);
705
706 // Get the exception oop klass from its header
707 Node* ex_klass_node = NULL;
708 if (has_ex_handler() && !ex_type->klass_is_exact()) {
709 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
710 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
711
712 // Compute the exception klass a little more cleverly.
713 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
714 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
715 // each arm of the Phi. If I know something clever about the exceptions
716 // I'm loading the class from, I can replace the LoadKlass with the
717 // klass constant for the exception oop.
718 if( ex_node->is_Phi() ) {
719 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
720 for( uint i = 1; i < ex_node->req(); i++ ) {
721 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
722 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
723 ex_klass_node->init_req( i, k );
724 }
725 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
726
727 }
728 }
729
730 // Scan the exception table for applicable handlers.
731 // If none, we can call rethrow() and be done!
732 // If precise (loaded with no subklasses), insert a D.S. style
733 // pointer compare to the correct handler and loop back.
734 // If imprecise, switch to the Rethrow VM-call style handling.
735
736 int remaining = handlers.count_remaining();
737
738 // iterate through all entries sequentially
739 for (;!handlers.is_done(); handlers.next()) {
740 ciExceptionHandler* handler = handlers.handler();
741
742 if (handler->is_rethrow()) {
743 // If we fell off the end of the table without finding an imprecise
744 // exception klass (and without finding a generic handler) then we
745 // know this exception is not handled in this method. We just rethrow
746 // the exception into the caller.
747 throw_to_exit(make_exception_state(ex_node));
748 return;
749 }
750
751 // exception handler bci range covers throw_bci => investigate further
752 int handler_bci = handler->handler_bci();
753
754 if (remaining == 1) {
755 push_ex_oop(ex_node); // Push exception oop for handler
756 #ifndef PRODUCT
757 if (PrintOpto && WizardMode) {
758 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
759 }
760 #endif
761 merge_exception(handler_bci); // jump to handler
762 return; // No more handling to be done here!
763 }
764
765 // Get the handler's klass
766 ciInstanceKlass* klass = handler->catch_klass();
767
768 if (!klass->is_loaded()) { // klass is not loaded?
769 // fall through into catch_call_exceptions which will emit a
770 // handler with an uncommon trap.
771 break;
772 }
773
774 if (klass->is_interface()) // should not happen, but...
775 break; // bail out
776
777 // Check the type of the exception against the catch type
778 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
779 Node* con = _gvn.makecon(tk);
780 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
781 if (!stopped()) {
782 PreserveJVMState pjvms(this);
783 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
784 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
785 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
786 push_ex_oop(ex_oop); // Push exception oop for handler
787 #ifndef PRODUCT
788 if (PrintOpto && WizardMode) {
789 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
790 klass->print_name();
791 tty->cr();
792 }
793 #endif
794 merge_exception(handler_bci);
795 }
796 set_control(not_subtype_ctrl);
797
798 // Come here if exception does not match handler.
799 // Carry on with more handler checks.
800 --remaining;
801 }
802
803 assert(!stopped(), "you should return if you finish the chain");
804
805 // Oops, need to call into the VM to resolve the klasses at runtime.
806 // Note: This call must not deoptimize, since it is not a real at this bci!
807 kill_dead_locals();
808
809 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
810 OptoRuntime::rethrow_Type(),
811 OptoRuntime::rethrow_stub(),
812 NULL, NULL,
813 ex_node);
814
815 // Rethrow is a pure call, no side effects, only a result.
816 // The result cannot be allocated, so we use I_O
817
818 // Catch exceptions from the rethrow
819 catch_call_exceptions(handlers);
820 }
821
822
823 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
824
825
826 #ifndef PRODUCT
827 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
828 if( CountCompiledCalls ) {
829 if( at_method_entry ) {
830 // bump invocation counter if top method (for statistics)
831 if (CountCompiledCalls && depth() == 1) {
832 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
833 Node* adr1 = makecon(addr_type);
834 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
835 increment_counter(adr2);
836 }
837 } else if (is_inline) {
838 switch (bc()) {
839 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
840 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
841 case Bytecodes::_invokestatic:
842 case Bytecodes::_invokedynamic:
843 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
844 default: fatal("unexpected call bytecode");
845 }
846 } else {
847 switch (bc()) {
848 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
849 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
850 case Bytecodes::_invokestatic:
851 case Bytecodes::_invokedynamic:
852 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
853 default: fatal("unexpected call bytecode");
854 }
855 }
856 }
857 }
858 #endif //PRODUCT
859
860
861 // Identify possible target method and inlining style
862 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
863 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
864 // only use for virtual or interface calls
865
866 // If it is obviously final, do not bother to call find_monomorphic_target,
867 // because the class hierarchy checks are not needed, and may fail due to
868 // incompletely loaded classes. Since we do our own class loading checks
869 // in this module, we may confidently bind to any method.
870 if (dest_method->can_be_statically_bound()) {
871 return dest_method;
872 }
873
874 // Attempt to improve the receiver
875 bool actual_receiver_is_exact = false;
876 ciInstanceKlass* actual_receiver = klass;
877 if (receiver_type != NULL) {
878 // Array methods are all inherited from Object, and are monomorphic.
879 if (receiver_type->isa_aryptr() &&
880 dest_method->holder() == env()->Object_klass()) {
881 return dest_method;
882 }
883
884 // All other interesting cases are instance klasses.
885 if (!receiver_type->isa_instptr()) {
886 return NULL;
887 }
888
889 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
890 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
891 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
892 // ikl is a same or better type than the original actual_receiver,
893 // e.g. static receiver from bytecodes.
894 actual_receiver = ikl;
895 // Is the actual_receiver exact?
896 actual_receiver_is_exact = receiver_type->klass_is_exact();
897 }
898 }
899
900 ciInstanceKlass* calling_klass = caller->holder();
901 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
902 if (cha_monomorphic_target != NULL) {
903 assert(!cha_monomorphic_target->is_abstract(), "");
904 // Look at the method-receiver type. Does it add "too much information"?
905 ciKlass* mr_klass = cha_monomorphic_target->holder();
906 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
907 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
908 // Calling this method would include an implicit cast to its holder.
909 // %%% Not yet implemented. Would throw minor asserts at present.
910 // %%% The most common wins are already gained by +UseUniqueSubclasses.
911 // To fix, put the higher_equal check at the call of this routine,
912 // and add a CheckCastPP to the receiver.
913 if (TraceDependencies) {
914 tty->print_cr("found unique CHA method, but could not cast up");
915 tty->print(" method = ");
916 cha_monomorphic_target->print();
917 tty->cr();
918 }
919 if (C->log() != NULL) {
920 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
921 C->log()->identify(klass),
922 C->log()->identify(cha_monomorphic_target));
923 }
924 cha_monomorphic_target = NULL;
925 }
926 }
927 if (cha_monomorphic_target != NULL) {
928 // Hardwiring a virtual.
929 // If we inlined because CHA revealed only a single target method,
930 // then we are dependent on that target method not getting overridden
931 // by dynamic class loading. Be sure to test the "static" receiver
932 // dest_method here, as opposed to the actual receiver, which may
933 // falsely lead us to believe that the receiver is final or private.
934 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
935 return cha_monomorphic_target;
936 }
937
938 // If the type is exact, we can still bind the method w/o a vcall.
939 // (This case comes after CHA so we can see how much extra work it does.)
940 if (actual_receiver_is_exact) {
941 // In case of evolution, there is a dependence on every inlined method, since each
942 // such method can be changed when its class is redefined.
943 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
944 if (exact_method != NULL) {
945 #ifndef PRODUCT
946 if (PrintOpto) {
947 tty->print(" Calling method via exact type @%d --- ", bci);
948 exact_method->print_name();
949 tty->cr();
950 }
951 #endif
952 return exact_method;
953 }
954 }
955
956 return NULL;
957 }