1 /*
2 * Copyright (c) 1998, 2010, 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 "incls/_precompiled.incl"
26 #include "incls/_doCall.cpp.incl"
27
28 #ifndef PRODUCT
29 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
30 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) {
31 tty->print(" ");
32 for( int i = 0; i < depth; i++ ) tty->print(" ");
33 if (!PrintOpto) {
34 method->print_short_name();
35 tty->print(" ->");
36 }
37 tty->print(" @ %d ", bci);
38 prof_method->print_short_name();
39 tty->print(" >>TypeProfile (%d/%d counts) = ", receiver_count, site_count);
40 prof_klass->name()->print_symbol();
41 tty->print_cr(" (%d bytes)", prof_method->code_size());
42 }
43 }
44 #endif
45
46 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual,
47 JVMState* jvms, bool allow_inline,
48 float prof_factor) {
49 CallGenerator* cg;
50
51 // Dtrace currently doesn't work unless all calls are vanilla
52 if (env()->dtrace_method_probes()) {
53 allow_inline = false;
54 }
55
56 // Note: When we get profiling during stage-1 compiles, we want to pull
57 // from more specific profile data which pertains to this inlining.
58 // Right now, ignore the information in jvms->caller(), and do method[bci].
59 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci());
60
61 // See how many times this site has been invoked.
62 int site_count = profile.count();
63 int receiver_count = -1;
64 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
65 // Receivers in the profile structure are ordered by call counts
66 // so that the most called (major) receiver is profile.receiver(0).
67 receiver_count = profile.receiver_count(0);
68 }
69
70 CompileLog* log = this->log();
71 if (log != NULL) {
72 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
73 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
74 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
75 log->identify(call_method), site_count, prof_factor);
76 if (call_is_virtual) log->print(" virtual='1'");
77 if (allow_inline) log->print(" inline='1'");
78 if (receiver_count >= 0) {
79 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
80 if (profile.has_receiver(1)) {
81 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
82 }
83 }
84 log->end_elem();
85 }
86
87 // Special case the handling of certain common, profitable library
88 // methods. If these methods are replaced with specialized code,
89 // then we return it as the inlined version of the call.
90 // We do this before the strict f.p. check below because the
91 // intrinsics handle strict f.p. correctly.
92 if (allow_inline) {
93 cg = find_intrinsic(call_method, call_is_virtual);
94 if (cg != NULL) return cg;
95 }
96
97 // Do MethodHandle calls.
98 // NOTE: This must happen before normal inlining logic below since
99 // MethodHandle.invoke* are native methods which obviously don't
100 // have bytecodes and so normal inlining fails.
101 if (call_method->is_method_handle_invoke()) {
102 if (jvms->method()->java_code_at_bci(jvms->bci()) != Bytecodes::_invokedynamic) {
103 GraphKit kit(jvms);
104 Node* n = kit.argument(0);
105
106 if (n->Opcode() == Op_ConP) {
107 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr();
108 ciObject* const_oop = oop_ptr->const_oop();
109 ciMethodHandle* method_handle = const_oop->as_method_handle();
110
111 // Set the actually called method to have access to the class
112 // and signature in the MethodHandleCompiler.
113 method_handle->set_callee(call_method);
114
115 // Get an adapter for the MethodHandle.
116 ciMethod* target_method = method_handle->get_method_handle_adapter();
117
118 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
119 if (hit_cg != NULL && hit_cg->is_inline())
120 return hit_cg;
121 }
122
123 return CallGenerator::for_direct_call(call_method);
124 }
125 else {
126 // Get the MethodHandle from the CallSite.
127 ciMethod* caller_method = jvms->method();
128 ciBytecodeStream str(caller_method);
129 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci.
130 ciCallSite* call_site = str.get_call_site();
131 ciMethodHandle* method_handle = call_site->get_target();
132
133 // Set the actually called method to have access to the class
134 // and signature in the MethodHandleCompiler.
135 method_handle->set_callee(call_method);
136
137 // Get an adapter for the MethodHandle.
138 ciMethod* target_method = method_handle->get_invokedynamic_adapter();
139
140 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
141 if (hit_cg != NULL && hit_cg->is_inline()) {
142 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method);
143 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor);
144 }
145
146 // If something failed, generate a normal dynamic call.
147 return CallGenerator::for_dynamic_call(call_method);
148 }
149 }
150
151 // Do not inline strict fp into non-strict code, or the reverse
152 bool caller_method_is_strict = jvms->method()->is_strict();
153 if( caller_method_is_strict ^ call_method->is_strict() ) {
154 allow_inline = false;
155 }
156
157 // Attempt to inline...
158 if (allow_inline) {
159 // The profile data is only partly attributable to this caller,
160 // scale back the call site information.
161 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
162 // This is the number of times we expect the call code to be used.
163 float expected_uses = past_uses;
164
165 // Try inlining a bytecoded method:
166 if (!call_is_virtual) {
167 InlineTree* ilt;
168 if (UseOldInlining) {
169 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
170 } else {
171 // Make a disembodied, stateless ILT.
172 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
173 float site_invoke_ratio = prof_factor;
174 // Note: ilt is for the root of this parse, not the present call site.
175 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0);
176 }
177 WarmCallInfo scratch_ci;
178 if (!UseOldInlining)
179 scratch_ci.init(jvms, call_method, profile, prof_factor);
180 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
181 assert(ci != &scratch_ci, "do not let this pointer escape");
182 bool allow_inline = (ci != NULL && !ci->is_cold());
183 bool require_inline = (allow_inline && ci->is_hot());
184
185 if (allow_inline) {
186 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
187 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) {
188 // Delay the inlining of this method to give us the
189 // opportunity to perform some high level optimizations
190 // first.
191 return CallGenerator::for_late_inline(call_method, cg);
192 }
193 if (cg == NULL) {
194 // Fall through.
195 } else if (require_inline || !InlineWarmCalls) {
196 return cg;
197 } else {
198 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
199 return CallGenerator::for_warm_call(ci, cold_cg, cg);
200 }
201 }
202 }
203
204 // Try using the type profile.
205 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
206 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
207 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
208 ciMethod* receiver_method = NULL;
209 if (have_major_receiver || profile.morphism() == 1 ||
210 (profile.morphism() == 2 && UseBimorphicInlining)) {
211 // receiver_method = profile.method();
212 // Profiles do not suggest methods now. Look it up in the major receiver.
213 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
214 profile.receiver(0));
215 }
216 if (receiver_method != NULL) {
217 // The single majority receiver sufficiently outweighs the minority.
218 CallGenerator* hit_cg = this->call_generator(receiver_method,
219 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
220 if (hit_cg != NULL) {
221 // Look up second receiver.
222 CallGenerator* next_hit_cg = NULL;
223 ciMethod* next_receiver_method = NULL;
224 if (profile.morphism() == 2 && UseBimorphicInlining) {
225 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
226 profile.receiver(1));
227 if (next_receiver_method != NULL) {
228 next_hit_cg = this->call_generator(next_receiver_method,
229 vtable_index, !call_is_virtual, jvms,
230 allow_inline, prof_factor);
231 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
232 have_major_receiver && UseOnlyInlinedBimorphic) {
233 // Skip if we can't inline second receiver's method
234 next_hit_cg = NULL;
235 }
236 }
237 }
238 CallGenerator* miss_cg;
239 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
240 Deoptimization::Reason_bimorphic :
241 Deoptimization::Reason_class_check;
242 if (( profile.morphism() == 1 ||
243 (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
244 !too_many_traps(jvms->method(), jvms->bci(), reason)
245 ) {
246 // Generate uncommon trap for class check failure path
247 // in case of monomorphic or bimorphic virtual call site.
248 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason,
249 Deoptimization::Action_maybe_recompile);
250 } else {
251 // Generate virtual call for class check failure path
252 // in case of polymorphic virtual call site.
253 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
254 }
255 if (miss_cg != NULL) {
256 if (next_hit_cg != NULL) {
257 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
258 // We don't need to record dependency on a receiver here and below.
259 // Whenever we inline, the dependency is added by Parse::Parse().
260 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
261 }
262 if (miss_cg != NULL) {
263 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
264 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
265 if (cg != NULL) return cg;
266 }
267 }
268 }
269 }
270 }
271 }
272
273 // There was no special inlining tactic, or it bailed out.
274 // Use a more generic tactic, like a simple call.
275 if (call_is_virtual) {
276 return CallGenerator::for_virtual_call(call_method, vtable_index);
277 } else {
278 // Class Hierarchy Analysis or Type Profile reveals a unique target,
279 // or it is a static or special call.
280 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms));
281 }
282 }
283
284 // Return true for methods that shouldn't be inlined early so that
285 // they are easier to analyze and optimize as intrinsics.
286 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
287 if (has_stringbuilder()) {
288
289 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
290 call_method->holder() == C->env()->StringBuffer_klass()) &&
291 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
292 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
293 // Delay SB calls only when called from non-SB code
294 return false;
295 }
296
297 switch (call_method->intrinsic_id()) {
298 case vmIntrinsics::_StringBuilder_void:
299 case vmIntrinsics::_StringBuilder_int:
300 case vmIntrinsics::_StringBuilder_String:
301 case vmIntrinsics::_StringBuilder_append_char:
302 case vmIntrinsics::_StringBuilder_append_int:
303 case vmIntrinsics::_StringBuilder_append_String:
304 case vmIntrinsics::_StringBuilder_toString:
305 case vmIntrinsics::_StringBuffer_void:
306 case vmIntrinsics::_StringBuffer_int:
307 case vmIntrinsics::_StringBuffer_String:
308 case vmIntrinsics::_StringBuffer_append_char:
309 case vmIntrinsics::_StringBuffer_append_int:
310 case vmIntrinsics::_StringBuffer_append_String:
311 case vmIntrinsics::_StringBuffer_toString:
312 case vmIntrinsics::_Integer_toString:
313 return true;
314
315 case vmIntrinsics::_String_String:
316 {
317 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
318 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
319 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
320 ciMethod* m = csj->method();
321 if (m != NULL &&
322 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
323 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
324 // Delay String.<init>(new SB())
325 return true;
326 }
327 return false;
328 }
329
330 default:
331 return false;
332 }
333 }
334 return false;
335 }
336
337
338 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
339 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
340 // Additional inputs to consider...
341 // bc = bc()
342 // caller = method()
343 // iter().get_method_holder_index()
344 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
345 // Interface classes can be loaded & linked and never get around to
346 // being initialized. Uncommon-trap for not-initialized static or
347 // v-calls. Let interface calls happen.
348 ciInstanceKlass* holder_klass = dest_method->holder();
349 if (!holder_klass->is_being_initialized() &&
350 !holder_klass->is_initialized() &&
351 !holder_klass->is_interface()) {
352 uncommon_trap(Deoptimization::Reason_uninitialized,
353 Deoptimization::Action_reinterpret,
354 holder_klass);
355 return true;
356 }
357
358 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
359 return false;
360 }
361
362
363 //------------------------------do_call----------------------------------------
364 // Handle your basic call. Inline if we can & want to, else just setup call.
365 void Parse::do_call() {
366 // It's likely we are going to add debug info soon.
367 // Also, if we inline a guy who eventually needs debug info for this JVMS,
368 // our contribution to it is cleaned up right here.
369 kill_dead_locals();
370
371 // Set frequently used booleans
372 bool is_virtual = bc() == Bytecodes::_invokevirtual;
373 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
374 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
375 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic;
376
377 // Find target being called
378 bool will_link;
379 ciMethod* dest_method = iter().get_method(will_link);
380 ciInstanceKlass* holder_klass = dest_method->holder();
381 ciKlass* holder = iter().get_declared_method_holder();
382 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
383
384 int nargs = dest_method->arg_size();
385 if (is_invokedynamic) nargs -= 1;
386
387 // uncommon-trap when callee is unloaded, uninitialized or will not link
388 // bailout when too many arguments for register representation
389 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
390 #ifndef PRODUCT
391 if (PrintOpto && (Verbose || WizardMode)) {
392 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
393 dest_method->print_name(); tty->cr();
394 }
395 #endif
396 return;
397 }
398 assert(holder_klass->is_loaded(), "");
399 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc");
400 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
401 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
402 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
403 // Note: In the absence of miranda methods, an abstract class K can perform
404 // an invokevirtual directly on an interface method I.m if K implements I.
405
406 // ---------------------
407 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
408 // Then we may inline or make a static call, but become dependent on there being only 1 target.
409 // Does the call-site type profile reveal only one receiver?
410 // Then we may introduce a run-time check and inline on the path where it succeeds.
411 // The other path may uncommon_trap, check for another receiver, or do a v-call.
412
413 // Choose call strategy.
414 bool call_is_virtual = is_virtual_or_interface;
415 int vtable_index = methodOopDesc::invalid_vtable_index;
416 ciMethod* call_method = dest_method;
417
418 // Try to get the most accurate receiver type
419 if (is_virtual_or_interface) {
420 Node* receiver_node = stack(sp() - nargs);
421 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
422 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
423
424 // Have the call been sufficiently improved such that it is no longer a virtual?
425 if (optimized_virtual_method != NULL) {
426 call_method = optimized_virtual_method;
427 call_is_virtual = false;
428 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
429 // We can make a vtable call at this site
430 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
431 }
432 }
433
434 // Note: It's OK to try to inline a virtual call.
435 // The call generator will not attempt to inline a polymorphic call
436 // unless it knows how to optimize the receiver dispatch.
437 bool try_inline = (C->do_inlining() || InlineAccessors);
438
439 // ---------------------
440 inc_sp(- nargs); // Temporarily pop args for JVM state of call
441 JVMState* jvms = sync_jvms();
442
443 // ---------------------
444 // Decide call tactic.
445 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
446 // It decides whether inlining is desirable or not.
447 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
448
449 // ---------------------
450 // Round double arguments before call
451 round_double_arguments(dest_method);
452
453 #ifndef PRODUCT
454 // bump global counters for calls
455 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
456
457 // Record first part of parsing work for this call
458 parse_histogram()->record_change();
459 #endif // not PRODUCT
460
461 assert(jvms == this->jvms(), "still operating on the right JVMS");
462 assert(jvms_in_sync(), "jvms must carry full info into CG");
463
464 // save across call, for a subsequent cast_not_null.
465 Node* receiver = has_receiver ? argument(0) : NULL;
466
467 // Bump method data counters (We profile *before* the call is made
468 // because exceptions don't return to the call site.)
469 profile_call(receiver);
470
471 JVMState* new_jvms;
472 if ((new_jvms = cg->generate(jvms)) == NULL) {
473 // When inlining attempt fails (e.g., too many arguments),
474 // it may contaminate the current compile state, making it
475 // impossible to pull back and try again. Once we call
476 // cg->generate(), we are committed. If it fails, the whole
477 // compilation task is compromised.
478 if (failing()) return;
479 #ifndef PRODUCT
480 if (PrintOpto || PrintOptoInlining || PrintInlining) {
481 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
482 if (cg->is_intrinsic() && call_method->code_size() > 0) {
483 tty->print("Bailed out of intrinsic, will not inline: ");
484 call_method->print_name(); tty->cr();
485 }
486 }
487 #endif
488 // This can happen if a library intrinsic is available, but refuses
489 // the call site, perhaps because it did not match a pattern the
490 // intrinsic was expecting to optimize. The fallback position is
491 // to call out-of-line.
492 try_inline = false; // Inline tactic bailed out.
493 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
494 if ((new_jvms = cg->generate(jvms)) == NULL) {
495 guarantee(failing(), "call failed to generate: calls should work");
496 return;
497 }
498 }
499
500 if (cg->is_inline()) {
501 // Accumulate has_loops estimate
502 C->set_has_loops(C->has_loops() || call_method->has_loops());
503 C->env()->notice_inlined_method(call_method);
504 }
505
506 // Reset parser state from [new_]jvms, which now carries results of the call.
507 // Return value (if any) is already pushed on the stack by the cg.
508 add_exception_states_from(new_jvms);
509 if (new_jvms->map()->control() == top()) {
510 stop_and_kill_map();
511 } else {
512 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
513 set_jvms(new_jvms);
514 }
515
516 if (!stopped()) {
517 // This was some sort of virtual call, which did a null check for us.
518 // Now we can assert receiver-not-null, on the normal return path.
519 if (receiver != NULL && cg->is_virtual()) {
520 Node* cast = cast_not_null(receiver);
521 // %%% assert(receiver == cast, "should already have cast the receiver");
522 }
523
524 // Round double result after a call from strict to non-strict code
525 round_double_result(dest_method);
526
527 // If the return type of the method is not loaded, assert that the
528 // value we got is a null. Otherwise, we need to recompile.
529 if (!dest_method->return_type()->is_loaded()) {
530 #ifndef PRODUCT
531 if (PrintOpto && (Verbose || WizardMode)) {
532 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
533 dest_method->print_name(); tty->cr();
534 }
535 #endif
536 if (C->log() != NULL) {
537 C->log()->elem("assert_null reason='return' klass='%d'",
538 C->log()->identify(dest_method->return_type()));
539 }
540 // If there is going to be a trap, put it at the next bytecode:
541 set_bci(iter().next_bci());
542 do_null_assert(peek(), T_OBJECT);
543 set_bci(iter().cur_bci()); // put it back
544 }
545 }
546
547 // Restart record of parsing work after possible inlining of call
548 #ifndef PRODUCT
549 parse_histogram()->set_initial_state(bc());
550 #endif
551 }
552
553 //---------------------------catch_call_exceptions-----------------------------
554 // Put a Catch and CatchProj nodes behind a just-created call.
555 // Send their caught exceptions to the proper handler.
556 // This may be used after a call to the rethrow VM stub,
557 // when it is needed to process unloaded exception classes.
558 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
559 // Exceptions are delivered through this channel:
560 Node* i_o = this->i_o();
561
562 // Add a CatchNode.
563 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
564 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
565 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
566
567 for (; !handlers.is_done(); handlers.next()) {
568 ciExceptionHandler* h = handlers.handler();
569 int h_bci = h->handler_bci();
570 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
571 // Do not introduce unloaded exception types into the graph:
572 if (!h_klass->is_loaded()) {
573 if (saw_unloaded->contains(h_bci)) {
574 /* We've already seen an unloaded exception with h_bci,
575 so don't duplicate. Duplication will cause the CatchNode to be
576 unnecessarily large. See 4713716. */
577 continue;
578 } else {
579 saw_unloaded->append(h_bci);
580 }
581 }
582 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
583 // (We use make_from_klass because it respects UseUniqueSubclasses.)
584 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
585 assert(!h_extype->empty(), "sanity");
586 // Note: It's OK if the BCIs repeat themselves.
587 bcis->append(h_bci);
588 extypes->append(h_extype);
589 }
590
591 int len = bcis->length();
592 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
593 Node *catch_ = _gvn.transform(cn);
594
595 // now branch with the exception state to each of the (potential)
596 // handlers
597 for(int i=0; i < len; i++) {
598 // Setup JVM state to enter the handler.
599 PreserveJVMState pjvms(this);
600 // Locals are just copied from before the call.
601 // Get control from the CatchNode.
602 int handler_bci = bcis->at(i);
603 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
604 // This handler cannot happen?
605 if (ctrl == top()) continue;
606 set_control(ctrl);
607
608 // Create exception oop
609 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
610 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
611
612 // Handle unloaded exception classes.
613 if (saw_unloaded->contains(handler_bci)) {
614 // An unloaded exception type is coming here. Do an uncommon trap.
615 #ifndef PRODUCT
616 // We do not expect the same handler bci to take both cold unloaded
617 // and hot loaded exceptions. But, watch for it.
618 if (extype->is_loaded()) {
619 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
620 method()->print_name(); tty->cr();
621 } else if (PrintOpto && (Verbose || WizardMode)) {
622 tty->print("Bailing out on unloaded exception type ");
623 extype->klass()->print_name();
624 tty->print(" at bci:%d in ", bci());
625 method()->print_name(); tty->cr();
626 }
627 #endif
628 // Emit an uncommon trap instead of processing the block.
629 set_bci(handler_bci);
630 push_ex_oop(ex_oop);
631 uncommon_trap(Deoptimization::Reason_unloaded,
632 Deoptimization::Action_reinterpret,
633 extype->klass(), "!loaded exception");
634 set_bci(iter().cur_bci()); // put it back
635 continue;
636 }
637
638 // go to the exception handler
639 if (handler_bci < 0) { // merge with corresponding rethrow node
640 throw_to_exit(make_exception_state(ex_oop));
641 } else { // Else jump to corresponding handle
642 push_ex_oop(ex_oop); // Clear stack and push just the oop.
643 merge_exception(handler_bci);
644 }
645 }
646
647 // The first CatchProj is for the normal return.
648 // (Note: If this is a call to rethrow_Java, this node goes dead.)
649 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
650 }
651
652
653 //----------------------------catch_inline_exceptions--------------------------
654 // Handle all exceptions thrown by an inlined method or individual bytecode.
655 // Common case 1: we have no handler, so all exceptions merge right into
656 // the rethrow case.
657 // Case 2: we have some handlers, with loaded exception klasses that have
658 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
659 // exception oop and branch to the handler directly.
660 // Case 3: We have some handlers with subklasses or are not loaded at
661 // compile-time. We have to call the runtime to resolve the exception.
662 // So we insert a RethrowCall and all the logic that goes with it.
663 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
664 // Caller is responsible for saving away the map for normal control flow!
665 assert(stopped(), "call set_map(NULL) first");
666 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
667
668 Node* ex_node = saved_ex_oop(ex_map);
669 if (ex_node == top()) {
670 // No action needed.
671 return;
672 }
673 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
674 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
675 if (ex_type == NULL)
676 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
677
678 // determine potential exception handlers
679 ciExceptionHandlerStream handlers(method(), bci(),
680 ex_type->klass()->as_instance_klass(),
681 ex_type->klass_is_exact());
682
683 // Start executing from the given throw state. (Keep its stack, for now.)
684 // Get the exception oop as known at compile time.
685 ex_node = use_exception_state(ex_map);
686
687 // Get the exception oop klass from its header
688 Node* ex_klass_node = NULL;
689 if (has_ex_handler() && !ex_type->klass_is_exact()) {
690 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
691 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
692
693 // Compute the exception klass a little more cleverly.
694 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
695 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
696 // each arm of the Phi. If I know something clever about the exceptions
697 // I'm loading the class from, I can replace the LoadKlass with the
698 // klass constant for the exception oop.
699 if( ex_node->is_Phi() ) {
700 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
701 for( uint i = 1; i < ex_node->req(); i++ ) {
702 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
703 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
704 ex_klass_node->init_req( i, k );
705 }
706 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
707
708 }
709 }
710
711 // Scan the exception table for applicable handlers.
712 // If none, we can call rethrow() and be done!
713 // If precise (loaded with no subklasses), insert a D.S. style
714 // pointer compare to the correct handler and loop back.
715 // If imprecise, switch to the Rethrow VM-call style handling.
716
717 int remaining = handlers.count_remaining();
718
719 // iterate through all entries sequentially
720 for (;!handlers.is_done(); handlers.next()) {
721 ciExceptionHandler* handler = handlers.handler();
722
723 if (handler->is_rethrow()) {
724 // If we fell off the end of the table without finding an imprecise
725 // exception klass (and without finding a generic handler) then we
726 // know this exception is not handled in this method. We just rethrow
727 // the exception into the caller.
728 throw_to_exit(make_exception_state(ex_node));
729 return;
730 }
731
732 // exception handler bci range covers throw_bci => investigate further
733 int handler_bci = handler->handler_bci();
734
735 if (remaining == 1) {
736 push_ex_oop(ex_node); // Push exception oop for handler
737 #ifndef PRODUCT
738 if (PrintOpto && WizardMode) {
739 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
740 }
741 #endif
742 merge_exception(handler_bci); // jump to handler
743 return; // No more handling to be done here!
744 }
745
746 // Get the handler's klass
747 ciInstanceKlass* klass = handler->catch_klass();
748
749 if (!klass->is_loaded()) { // klass is not loaded?
750 // fall through into catch_call_exceptions which will emit a
751 // handler with an uncommon trap.
752 break;
753 }
754
755 if (klass->is_interface()) // should not happen, but...
756 break; // bail out
757
758 // Check the type of the exception against the catch type
759 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
760 Node* con = _gvn.makecon(tk);
761 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
762 if (!stopped()) {
763 PreserveJVMState pjvms(this);
764 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
765 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
766 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
767 push_ex_oop(ex_oop); // Push exception oop for handler
768 #ifndef PRODUCT
769 if (PrintOpto && WizardMode) {
770 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
771 klass->print_name();
772 tty->cr();
773 }
774 #endif
775 merge_exception(handler_bci);
776 }
777 set_control(not_subtype_ctrl);
778
779 // Come here if exception does not match handler.
780 // Carry on with more handler checks.
781 --remaining;
782 }
783
784 assert(!stopped(), "you should return if you finish the chain");
785
786 // Oops, need to call into the VM to resolve the klasses at runtime.
787 // Note: This call must not deoptimize, since it is not a real at this bci!
788 kill_dead_locals();
789
790 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
791 OptoRuntime::rethrow_Type(),
792 OptoRuntime::rethrow_stub(),
793 NULL, NULL,
794 ex_node);
795
796 // Rethrow is a pure call, no side effects, only a result.
797 // The result cannot be allocated, so we use I_O
798
799 // Catch exceptions from the rethrow
800 catch_call_exceptions(handlers);
801 }
802
803
804 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
805
806
807 #ifndef PRODUCT
808 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
809 if( CountCompiledCalls ) {
810 if( at_method_entry ) {
811 // bump invocation counter if top method (for statistics)
812 if (CountCompiledCalls && depth() == 1) {
813 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
814 Node* adr1 = makecon(addr_type);
815 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
816 increment_counter(adr2);
817 }
818 } else if (is_inline) {
819 switch (bc()) {
820 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
821 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
822 case Bytecodes::_invokestatic:
823 case Bytecodes::_invokedynamic:
824 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
825 default: fatal("unexpected call bytecode");
826 }
827 } else {
828 switch (bc()) {
829 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
830 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
831 case Bytecodes::_invokestatic:
832 case Bytecodes::_invokedynamic:
833 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
834 default: fatal("unexpected call bytecode");
835 }
836 }
837 }
838 }
839 #endif //PRODUCT
840
841
842 // Identify possible target method and inlining style
843 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
844 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
845 // only use for virtual or interface calls
846
847 // If it is obviously final, do not bother to call find_monomorphic_target,
848 // because the class hierarchy checks are not needed, and may fail due to
849 // incompletely loaded classes. Since we do our own class loading checks
850 // in this module, we may confidently bind to any method.
851 if (dest_method->can_be_statically_bound()) {
852 return dest_method;
853 }
854
855 // Attempt to improve the receiver
856 bool actual_receiver_is_exact = false;
857 ciInstanceKlass* actual_receiver = klass;
858 if (receiver_type != NULL) {
859 // Array methods are all inherited from Object, and are monomorphic.
860 if (receiver_type->isa_aryptr() &&
861 dest_method->holder() == env()->Object_klass()) {
862 return dest_method;
863 }
864
865 // All other interesting cases are instance klasses.
866 if (!receiver_type->isa_instptr()) {
867 return NULL;
868 }
869
870 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
871 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
872 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
873 // ikl is a same or better type than the original actual_receiver,
874 // e.g. static receiver from bytecodes.
875 actual_receiver = ikl;
876 // Is the actual_receiver exact?
877 actual_receiver_is_exact = receiver_type->klass_is_exact();
878 }
879 }
880
881 ciInstanceKlass* calling_klass = caller->holder();
882 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
883 if (cha_monomorphic_target != NULL) {
884 assert(!cha_monomorphic_target->is_abstract(), "");
885 // Look at the method-receiver type. Does it add "too much information"?
886 ciKlass* mr_klass = cha_monomorphic_target->holder();
887 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
888 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
889 // Calling this method would include an implicit cast to its holder.
890 // %%% Not yet implemented. Would throw minor asserts at present.
891 // %%% The most common wins are already gained by +UseUniqueSubclasses.
892 // To fix, put the higher_equal check at the call of this routine,
893 // and add a CheckCastPP to the receiver.
894 if (TraceDependencies) {
895 tty->print_cr("found unique CHA method, but could not cast up");
896 tty->print(" method = ");
897 cha_monomorphic_target->print();
898 tty->cr();
899 }
900 if (C->log() != NULL) {
901 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
902 C->log()->identify(klass),
903 C->log()->identify(cha_monomorphic_target));
904 }
905 cha_monomorphic_target = NULL;
906 }
907 }
908 if (cha_monomorphic_target != NULL) {
909 // Hardwiring a virtual.
910 // If we inlined because CHA revealed only a single target method,
911 // then we are dependent on that target method not getting overridden
912 // by dynamic class loading. Be sure to test the "static" receiver
913 // dest_method here, as opposed to the actual receiver, which may
914 // falsely lead us to believe that the receiver is final or private.
915 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
916 return cha_monomorphic_target;
917 }
918
919 // If the type is exact, we can still bind the method w/o a vcall.
920 // (This case comes after CHA so we can see how much extra work it does.)
921 if (actual_receiver_is_exact) {
922 // In case of evolution, there is a dependence on every inlined method, since each
923 // such method can be changed when its class is redefined.
924 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
925 if (exact_method != NULL) {
926 #ifndef PRODUCT
927 if (PrintOpto) {
928 tty->print(" Calling method via exact type @%d --- ", bci);
929 exact_method->print_name();
930 tty->cr();
931 }
932 #endif
933 return exact_method;
934 }
935 }
936
937 return NULL;
938 }