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 Bytecodes::Code bytecode = jvms->method()->java_code_at_bci(jvms->bci());
78
79 // See how many times this site has been invoked.
80 int site_count = profile.count();
81 int receiver_count = -1;
82 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
83 // Receivers in the profile structure are ordered by call counts
84 // so that the most called (major) receiver is profile.receiver(0).
85 receiver_count = profile.receiver_count(0);
86 }
87
88 CompileLog* log = this->log();
89 if (log != NULL) {
90 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
91 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
92 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
93 log->identify(call_method), site_count, prof_factor);
94 if (call_is_virtual) log->print(" virtual='1'");
95 if (allow_inline) log->print(" inline='1'");
96 if (receiver_count >= 0) {
97 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
98 if (profile.has_receiver(1)) {
99 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
100 }
101 }
102 log->end_elem();
103 }
104
105 // Special case the handling of certain common, profitable library
106 // methods. If these methods are replaced with specialized code,
107 // then we return it as the inlined version of the call.
108 // We do this before the strict f.p. check below because the
109 // intrinsics handle strict f.p. correctly.
110 if (allow_inline) {
111 cg = find_intrinsic(call_method, call_is_virtual);
112 if (cg != NULL) return cg;
113 }
114
115 // Do MethodHandle calls.
116 // NOTE: This must happen before normal inlining logic below since
117 // MethodHandle.invoke* are native methods which obviously don't
118 // have bytecodes and so normal inlining fails.
119 if (call_method->is_method_handle_invoke()) {
120 if (bytecode != Bytecodes::_invokedynamic) {
121 GraphKit kit(jvms);
122 Node* n = kit.argument(0);
123
124 if (n->Opcode() == Op_ConP) {
125 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr();
126 ciObject* const_oop = oop_ptr->const_oop();
127 ciMethodHandle* method_handle = const_oop->as_method_handle();
128
129 // Set the actually called method to have access to the class
130 // and signature in the MethodHandleCompiler.
131 method_handle->set_callee(call_method);
132 method_handle->set_call_profile(&profile);
133
134 // Get an adapter for the MethodHandle.
135 ciMethod* target_method = method_handle->get_method_handle_adapter();
136 if (target_method != NULL) {
137 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
138 if (hit_cg != NULL && hit_cg->is_inline())
139 return hit_cg;
140 }
141 }
142
143 return CallGenerator::for_direct_call(call_method);
144 }
145 else {
146 // Get the MethodHandle from the CallSite.
147 ciMethod* caller_method = jvms->method();
148 ciBytecodeStream str(caller_method);
149 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci.
150 ciCallSite* call_site = str.get_call_site();
151 ciMethodHandle* method_handle = call_site->get_target();
152
153 // Set the actually called method to have access to the class
154 // and signature in the MethodHandleCompiler.
155 method_handle->set_callee(call_method);
156 method_handle->set_call_profile(&profile);
157
158 // Get an adapter for the MethodHandle.
159 ciMethod* target_method = method_handle->get_invokedynamic_adapter();
160 if (target_method != NULL) {
161 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
162 if (hit_cg != NULL && hit_cg->is_inline()) {
163 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method);
164 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor);
165 }
166 }
167
168 // If something failed, generate a normal dynamic call.
169 return CallGenerator::for_dynamic_call(call_method);
170 }
171 }
172
173 // Do not inline strict fp into non-strict code, or the reverse
174 bool caller_method_is_strict = jvms->method()->is_strict();
175 if( caller_method_is_strict ^ call_method->is_strict() ) {
176 allow_inline = false;
177 }
178
179 // Attempt to inline...
180 if (allow_inline) {
181 // The profile data is only partly attributable to this caller,
182 // scale back the call site information.
183 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
184 // This is the number of times we expect the call code to be used.
185 float expected_uses = past_uses;
186
187 // Try inlining a bytecoded method:
188 if (!call_is_virtual) {
189 InlineTree* ilt;
190 if (UseOldInlining) {
191 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
192 } else {
193 // Make a disembodied, stateless ILT.
194 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
195 float site_invoke_ratio = prof_factor;
196 // Note: ilt is for the root of this parse, not the present call site.
197 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0);
198 }
199 WarmCallInfo scratch_ci;
200 if (!UseOldInlining)
201 scratch_ci.init(jvms, call_method, profile, prof_factor);
202 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
203 assert(ci != &scratch_ci, "do not let this pointer escape");
204 bool allow_inline = (ci != NULL && !ci->is_cold());
205 bool require_inline = (allow_inline && ci->is_hot());
206
207 if (allow_inline) {
208 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
209 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) {
210 // Delay the inlining of this method to give us the
211 // opportunity to perform some high level optimizations
212 // first.
213 return CallGenerator::for_late_inline(call_method, cg);
214 }
215 if (cg == NULL) {
216 // Fall through.
217 } else if (require_inline || !InlineWarmCalls) {
218 return cg;
219 } else {
220 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
221 return CallGenerator::for_warm_call(ci, cold_cg, cg);
222 }
223 }
224 }
225
226 // Try using the type profile.
227 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
228 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
229 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
230 ciMethod* receiver_method = NULL;
231 if (have_major_receiver || profile.morphism() == 1 ||
232 (profile.morphism() == 2 && UseBimorphicInlining)) {
233 // receiver_method = profile.method();
234 // Profiles do not suggest methods now. Look it up in the major receiver.
235 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
236 profile.receiver(0));
237 }
238 if (receiver_method != NULL) {
239 // The single majority receiver sufficiently outweighs the minority.
240 CallGenerator* hit_cg = this->call_generator(receiver_method,
241 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
242 if (hit_cg != NULL) {
243 // Look up second receiver.
244 CallGenerator* next_hit_cg = NULL;
245 ciMethod* next_receiver_method = NULL;
246 if (profile.morphism() == 2 && UseBimorphicInlining) {
247 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
248 profile.receiver(1));
249 if (next_receiver_method != NULL) {
250 next_hit_cg = this->call_generator(next_receiver_method,
251 vtable_index, !call_is_virtual, jvms,
252 allow_inline, prof_factor);
253 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
254 have_major_receiver && UseOnlyInlinedBimorphic) {
255 // Skip if we can't inline second receiver's method
256 next_hit_cg = NULL;
257 }
258 }
259 }
260 CallGenerator* miss_cg;
261 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
262 Deoptimization::Reason_bimorphic :
263 Deoptimization::Reason_class_check;
264 if (( profile.morphism() == 1 ||
265 (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
266 !too_many_traps(jvms->method(), jvms->bci(), reason)
267 ) {
268 // Generate uncommon trap for class check failure path
269 // in case of monomorphic or bimorphic virtual call site.
270 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason,
271 Deoptimization::Action_maybe_recompile);
272 } else {
273 // Generate virtual call for class check failure path
274 // in case of polymorphic virtual call site.
275 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
276 }
277 if (miss_cg != NULL) {
278 if (next_hit_cg != NULL) {
279 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
280 // We don't need to record dependency on a receiver here and below.
281 // Whenever we inline, the dependency is added by Parse::Parse().
282 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
283 }
284 if (miss_cg != NULL) {
285 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
286 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
287 if (cg != NULL) return cg;
288 }
289 }
290 }
291 }
292 }
293 }
294
295 // There was no special inlining tactic, or it bailed out.
296 // Use a more generic tactic, like a simple call.
297 if (call_is_virtual) {
298 return CallGenerator::for_virtual_call(call_method, vtable_index);
299 } else {
300 // Class Hierarchy Analysis or Type Profile reveals a unique target,
301 // or it is a static or special call.
302 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms));
303 }
304 }
305
306 // Return true for methods that shouldn't be inlined early so that
307 // they are easier to analyze and optimize as intrinsics.
308 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
309 if (has_stringbuilder()) {
310
311 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
312 call_method->holder() == C->env()->StringBuffer_klass()) &&
313 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
314 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
315 // Delay SB calls only when called from non-SB code
316 return false;
317 }
318
319 switch (call_method->intrinsic_id()) {
320 case vmIntrinsics::_StringBuilder_void:
321 case vmIntrinsics::_StringBuilder_int:
322 case vmIntrinsics::_StringBuilder_String:
323 case vmIntrinsics::_StringBuilder_append_char:
324 case vmIntrinsics::_StringBuilder_append_int:
325 case vmIntrinsics::_StringBuilder_append_String:
326 case vmIntrinsics::_StringBuilder_toString:
327 case vmIntrinsics::_StringBuffer_void:
328 case vmIntrinsics::_StringBuffer_int:
329 case vmIntrinsics::_StringBuffer_String:
330 case vmIntrinsics::_StringBuffer_append_char:
331 case vmIntrinsics::_StringBuffer_append_int:
332 case vmIntrinsics::_StringBuffer_append_String:
333 case vmIntrinsics::_StringBuffer_toString:
334 case vmIntrinsics::_Integer_toString:
335 return true;
336
337 case vmIntrinsics::_String_String:
338 {
339 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
340 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
341 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
342 ciMethod* m = csj->method();
343 if (m != NULL &&
344 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
345 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
346 // Delay String.<init>(new SB())
347 return true;
348 }
349 return false;
350 }
351
352 default:
353 return false;
354 }
355 }
356 return false;
357 }
358
359
360 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
361 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
362 // Additional inputs to consider...
363 // bc = bc()
364 // caller = method()
365 // iter().get_method_holder_index()
366 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
367 // Interface classes can be loaded & linked and never get around to
368 // being initialized. Uncommon-trap for not-initialized static or
369 // v-calls. Let interface calls happen.
370 ciInstanceKlass* holder_klass = dest_method->holder();
371 if (!holder_klass->is_being_initialized() &&
372 !holder_klass->is_initialized() &&
373 !holder_klass->is_interface()) {
374 uncommon_trap(Deoptimization::Reason_uninitialized,
375 Deoptimization::Action_reinterpret,
376 holder_klass);
377 return true;
378 }
379
380 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
381 return false;
382 }
383
384
385 //------------------------------do_call----------------------------------------
386 // Handle your basic call. Inline if we can & want to, else just setup call.
387 void Parse::do_call() {
388 // It's likely we are going to add debug info soon.
389 // Also, if we inline a guy who eventually needs debug info for this JVMS,
390 // our contribution to it is cleaned up right here.
391 kill_dead_locals();
392
393 // Set frequently used booleans
394 bool is_virtual = bc() == Bytecodes::_invokevirtual;
395 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
396 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
397 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic;
398
399 // Find target being called
400 bool will_link;
401 ciMethod* dest_method = iter().get_method(will_link);
402 ciInstanceKlass* holder_klass = dest_method->holder();
403 ciKlass* holder = iter().get_declared_method_holder();
404 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
405
406 int nargs = dest_method->arg_size();
407 if (is_invokedynamic) nargs -= 1;
408
409 // uncommon-trap when callee is unloaded, uninitialized or will not link
410 // bailout when too many arguments for register representation
411 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
412 #ifndef PRODUCT
413 if (PrintOpto && (Verbose || WizardMode)) {
414 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
415 dest_method->print_name(); tty->cr();
416 }
417 #endif
418 return;
419 }
420 assert(holder_klass->is_loaded(), "");
421 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc");
422 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
423 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
424 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
425 // Note: In the absence of miranda methods, an abstract class K can perform
426 // an invokevirtual directly on an interface method I.m if K implements I.
427
428 // ---------------------
429 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
430 // Then we may inline or make a static call, but become dependent on there being only 1 target.
431 // Does the call-site type profile reveal only one receiver?
432 // Then we may introduce a run-time check and inline on the path where it succeeds.
433 // The other path may uncommon_trap, check for another receiver, or do a v-call.
434
435 // Choose call strategy.
436 bool call_is_virtual = is_virtual_or_interface;
437 int vtable_index = methodOopDesc::invalid_vtable_index;
438 ciMethod* call_method = dest_method;
439
440 // Try to get the most accurate receiver type
441 if (is_virtual_or_interface) {
442 Node* receiver_node = stack(sp() - nargs);
443 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
444 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
445
446 // Have the call been sufficiently improved such that it is no longer a virtual?
447 if (optimized_virtual_method != NULL) {
448 call_method = optimized_virtual_method;
449 call_is_virtual = false;
450 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
451 // We can make a vtable call at this site
452 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
453 }
454 }
455
456 // Note: It's OK to try to inline a virtual call.
457 // The call generator will not attempt to inline a polymorphic call
458 // unless it knows how to optimize the receiver dispatch.
459 bool try_inline = (C->do_inlining() || InlineAccessors);
460
461 // ---------------------
462 inc_sp(- nargs); // Temporarily pop args for JVM state of call
463 JVMState* jvms = sync_jvms();
464
465 // ---------------------
466 // Decide call tactic.
467 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
468 // It decides whether inlining is desirable or not.
469 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
470
471 // ---------------------
472 // Round double arguments before call
473 round_double_arguments(dest_method);
474
475 #ifndef PRODUCT
476 // bump global counters for calls
477 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
478
479 // Record first part of parsing work for this call
480 parse_histogram()->record_change();
481 #endif // not PRODUCT
482
483 assert(jvms == this->jvms(), "still operating on the right JVMS");
484 assert(jvms_in_sync(), "jvms must carry full info into CG");
485
486 // save across call, for a subsequent cast_not_null.
487 Node* receiver = has_receiver ? argument(0) : NULL;
488
489 // Bump method data counters (We profile *before* the call is made
490 // because exceptions don't return to the call site.)
491 profile_call(receiver);
492
493 JVMState* new_jvms;
494 if ((new_jvms = cg->generate(jvms)) == NULL) {
495 // When inlining attempt fails (e.g., too many arguments),
496 // it may contaminate the current compile state, making it
497 // impossible to pull back and try again. Once we call
498 // cg->generate(), we are committed. If it fails, the whole
499 // compilation task is compromised.
500 if (failing()) return;
501 #ifndef PRODUCT
502 if (PrintOpto || PrintOptoInlining || PrintInlining) {
503 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
504 if (cg->is_intrinsic() && call_method->code_size() > 0) {
505 tty->print("Bailed out of intrinsic, will not inline: ");
506 call_method->print_name(); tty->cr();
507 }
508 }
509 #endif
510 // This can happen if a library intrinsic is available, but refuses
511 // the call site, perhaps because it did not match a pattern the
512 // intrinsic was expecting to optimize. The fallback position is
513 // to call out-of-line.
514 try_inline = false; // Inline tactic bailed out.
515 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
516 if ((new_jvms = cg->generate(jvms)) == NULL) {
517 guarantee(failing(), "call failed to generate: calls should work");
518 return;
519 }
520 }
521
522 if (cg->is_inline()) {
523 // Accumulate has_loops estimate
524 C->set_has_loops(C->has_loops() || call_method->has_loops());
525 C->env()->notice_inlined_method(call_method);
526 }
527
528 // Reset parser state from [new_]jvms, which now carries results of the call.
529 // Return value (if any) is already pushed on the stack by the cg.
530 add_exception_states_from(new_jvms);
531 if (new_jvms->map()->control() == top()) {
532 stop_and_kill_map();
533 } else {
534 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
535 set_jvms(new_jvms);
536 }
537
538 if (!stopped()) {
539 // This was some sort of virtual call, which did a null check for us.
540 // Now we can assert receiver-not-null, on the normal return path.
541 if (receiver != NULL && cg->is_virtual()) {
542 Node* cast = cast_not_null(receiver);
543 // %%% assert(receiver == cast, "should already have cast the receiver");
544 }
545
546 // Round double result after a call from strict to non-strict code
547 round_double_result(dest_method);
548
549 // If the return type of the method is not loaded, assert that the
550 // value we got is a null. Otherwise, we need to recompile.
551 if (!dest_method->return_type()->is_loaded()) {
552 #ifndef PRODUCT
553 if (PrintOpto && (Verbose || WizardMode)) {
554 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
555 dest_method->print_name(); tty->cr();
556 }
557 #endif
558 if (C->log() != NULL) {
559 C->log()->elem("assert_null reason='return' klass='%d'",
560 C->log()->identify(dest_method->return_type()));
561 }
562 // If there is going to be a trap, put it at the next bytecode:
563 set_bci(iter().next_bci());
564 do_null_assert(peek(), T_OBJECT);
565 set_bci(iter().cur_bci()); // put it back
566 }
567 }
568
569 // Restart record of parsing work after possible inlining of call
570 #ifndef PRODUCT
571 parse_histogram()->set_initial_state(bc());
572 #endif
573 }
574
575 //---------------------------catch_call_exceptions-----------------------------
576 // Put a Catch and CatchProj nodes behind a just-created call.
577 // Send their caught exceptions to the proper handler.
578 // This may be used after a call to the rethrow VM stub,
579 // when it is needed to process unloaded exception classes.
580 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
581 // Exceptions are delivered through this channel:
582 Node* i_o = this->i_o();
583
584 // Add a CatchNode.
585 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
586 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
587 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
588
589 for (; !handlers.is_done(); handlers.next()) {
590 ciExceptionHandler* h = handlers.handler();
591 int h_bci = h->handler_bci();
592 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
593 // Do not introduce unloaded exception types into the graph:
594 if (!h_klass->is_loaded()) {
595 if (saw_unloaded->contains(h_bci)) {
596 /* We've already seen an unloaded exception with h_bci,
597 so don't duplicate. Duplication will cause the CatchNode to be
598 unnecessarily large. See 4713716. */
599 continue;
600 } else {
601 saw_unloaded->append(h_bci);
602 }
603 }
604 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
605 // (We use make_from_klass because it respects UseUniqueSubclasses.)
606 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
607 assert(!h_extype->empty(), "sanity");
608 // Note: It's OK if the BCIs repeat themselves.
609 bcis->append(h_bci);
610 extypes->append(h_extype);
611 }
612
613 int len = bcis->length();
614 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
615 Node *catch_ = _gvn.transform(cn);
616
617 // now branch with the exception state to each of the (potential)
618 // handlers
619 for(int i=0; i < len; i++) {
620 // Setup JVM state to enter the handler.
621 PreserveJVMState pjvms(this);
622 // Locals are just copied from before the call.
623 // Get control from the CatchNode.
624 int handler_bci = bcis->at(i);
625 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
626 // This handler cannot happen?
627 if (ctrl == top()) continue;
628 set_control(ctrl);
629
630 // Create exception oop
631 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
632 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
633
634 // Handle unloaded exception classes.
635 if (saw_unloaded->contains(handler_bci)) {
636 // An unloaded exception type is coming here. Do an uncommon trap.
637 #ifndef PRODUCT
638 // We do not expect the same handler bci to take both cold unloaded
639 // and hot loaded exceptions. But, watch for it.
640 if (extype->is_loaded()) {
641 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
642 method()->print_name(); tty->cr();
643 } else if (PrintOpto && (Verbose || WizardMode)) {
644 tty->print("Bailing out on unloaded exception type ");
645 extype->klass()->print_name();
646 tty->print(" at bci:%d in ", bci());
647 method()->print_name(); tty->cr();
648 }
649 #endif
650 // Emit an uncommon trap instead of processing the block.
651 set_bci(handler_bci);
652 push_ex_oop(ex_oop);
653 uncommon_trap(Deoptimization::Reason_unloaded,
654 Deoptimization::Action_reinterpret,
655 extype->klass(), "!loaded exception");
656 set_bci(iter().cur_bci()); // put it back
657 continue;
658 }
659
660 // go to the exception handler
661 if (handler_bci < 0) { // merge with corresponding rethrow node
662 throw_to_exit(make_exception_state(ex_oop));
663 } else { // Else jump to corresponding handle
664 push_ex_oop(ex_oop); // Clear stack and push just the oop.
665 merge_exception(handler_bci);
666 }
667 }
668
669 // The first CatchProj is for the normal return.
670 // (Note: If this is a call to rethrow_Java, this node goes dead.)
671 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
672 }
673
674
675 //----------------------------catch_inline_exceptions--------------------------
676 // Handle all exceptions thrown by an inlined method or individual bytecode.
677 // Common case 1: we have no handler, so all exceptions merge right into
678 // the rethrow case.
679 // Case 2: we have some handlers, with loaded exception klasses that have
680 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
681 // exception oop and branch to the handler directly.
682 // Case 3: We have some handlers with subklasses or are not loaded at
683 // compile-time. We have to call the runtime to resolve the exception.
684 // So we insert a RethrowCall and all the logic that goes with it.
685 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
686 // Caller is responsible for saving away the map for normal control flow!
687 assert(stopped(), "call set_map(NULL) first");
688 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
689
690 Node* ex_node = saved_ex_oop(ex_map);
691 if (ex_node == top()) {
692 // No action needed.
693 return;
694 }
695 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
696 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
697 if (ex_type == NULL)
698 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
699
700 // determine potential exception handlers
701 ciExceptionHandlerStream handlers(method(), bci(),
702 ex_type->klass()->as_instance_klass(),
703 ex_type->klass_is_exact());
704
705 // Start executing from the given throw state. (Keep its stack, for now.)
706 // Get the exception oop as known at compile time.
707 ex_node = use_exception_state(ex_map);
708
709 // Get the exception oop klass from its header
710 Node* ex_klass_node = NULL;
711 if (has_ex_handler() && !ex_type->klass_is_exact()) {
712 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
713 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
714
715 // Compute the exception klass a little more cleverly.
716 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
717 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
718 // each arm of the Phi. If I know something clever about the exceptions
719 // I'm loading the class from, I can replace the LoadKlass with the
720 // klass constant for the exception oop.
721 if( ex_node->is_Phi() ) {
722 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
723 for( uint i = 1; i < ex_node->req(); i++ ) {
724 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
725 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
726 ex_klass_node->init_req( i, k );
727 }
728 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
729
730 }
731 }
732
733 // Scan the exception table for applicable handlers.
734 // If none, we can call rethrow() and be done!
735 // If precise (loaded with no subklasses), insert a D.S. style
736 // pointer compare to the correct handler and loop back.
737 // If imprecise, switch to the Rethrow VM-call style handling.
738
739 int remaining = handlers.count_remaining();
740
741 // iterate through all entries sequentially
742 for (;!handlers.is_done(); handlers.next()) {
743 ciExceptionHandler* handler = handlers.handler();
744
745 if (handler->is_rethrow()) {
746 // If we fell off the end of the table without finding an imprecise
747 // exception klass (and without finding a generic handler) then we
748 // know this exception is not handled in this method. We just rethrow
749 // the exception into the caller.
750 throw_to_exit(make_exception_state(ex_node));
751 return;
752 }
753
754 // exception handler bci range covers throw_bci => investigate further
755 int handler_bci = handler->handler_bci();
756
757 if (remaining == 1) {
758 push_ex_oop(ex_node); // Push exception oop for handler
759 #ifndef PRODUCT
760 if (PrintOpto && WizardMode) {
761 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
762 }
763 #endif
764 merge_exception(handler_bci); // jump to handler
765 return; // No more handling to be done here!
766 }
767
768 // Get the handler's klass
769 ciInstanceKlass* klass = handler->catch_klass();
770
771 if (!klass->is_loaded()) { // klass is not loaded?
772 // fall through into catch_call_exceptions which will emit a
773 // handler with an uncommon trap.
774 break;
775 }
776
777 if (klass->is_interface()) // should not happen, but...
778 break; // bail out
779
780 // Check the type of the exception against the catch type
781 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
782 Node* con = _gvn.makecon(tk);
783 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
784 if (!stopped()) {
785 PreserveJVMState pjvms(this);
786 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
787 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
788 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
789 push_ex_oop(ex_oop); // Push exception oop for handler
790 #ifndef PRODUCT
791 if (PrintOpto && WizardMode) {
792 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
793 klass->print_name();
794 tty->cr();
795 }
796 #endif
797 merge_exception(handler_bci);
798 }
799 set_control(not_subtype_ctrl);
800
801 // Come here if exception does not match handler.
802 // Carry on with more handler checks.
803 --remaining;
804 }
805
806 assert(!stopped(), "you should return if you finish the chain");
807
808 // Oops, need to call into the VM to resolve the klasses at runtime.
809 // Note: This call must not deoptimize, since it is not a real at this bci!
810 kill_dead_locals();
811
812 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
813 OptoRuntime::rethrow_Type(),
814 OptoRuntime::rethrow_stub(),
815 NULL, NULL,
816 ex_node);
817
818 // Rethrow is a pure call, no side effects, only a result.
819 // The result cannot be allocated, so we use I_O
820
821 // Catch exceptions from the rethrow
822 catch_call_exceptions(handlers);
823 }
824
825
826 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
827
828
829 #ifndef PRODUCT
830 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
831 if( CountCompiledCalls ) {
832 if( at_method_entry ) {
833 // bump invocation counter if top method (for statistics)
834 if (CountCompiledCalls && depth() == 1) {
835 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
836 Node* adr1 = makecon(addr_type);
837 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
838 increment_counter(adr2);
839 }
840 } else if (is_inline) {
841 switch (bc()) {
842 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
843 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
844 case Bytecodes::_invokestatic:
845 case Bytecodes::_invokedynamic:
846 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
847 default: fatal("unexpected call bytecode");
848 }
849 } else {
850 switch (bc()) {
851 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
852 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
853 case Bytecodes::_invokestatic:
854 case Bytecodes::_invokedynamic:
855 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
856 default: fatal("unexpected call bytecode");
857 }
858 }
859 }
860 }
861 #endif //PRODUCT
862
863
864 // Identify possible target method and inlining style
865 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
866 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
867 // only use for virtual or interface calls
868
869 // If it is obviously final, do not bother to call find_monomorphic_target,
870 // because the class hierarchy checks are not needed, and may fail due to
871 // incompletely loaded classes. Since we do our own class loading checks
872 // in this module, we may confidently bind to any method.
873 if (dest_method->can_be_statically_bound()) {
874 return dest_method;
875 }
876
877 // Attempt to improve the receiver
878 bool actual_receiver_is_exact = false;
879 ciInstanceKlass* actual_receiver = klass;
880 if (receiver_type != NULL) {
881 // Array methods are all inherited from Object, and are monomorphic.
882 if (receiver_type->isa_aryptr() &&
883 dest_method->holder() == env()->Object_klass()) {
884 return dest_method;
885 }
886
887 // All other interesting cases are instance klasses.
888 if (!receiver_type->isa_instptr()) {
889 return NULL;
890 }
891
892 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
893 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
894 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
895 // ikl is a same or better type than the original actual_receiver,
896 // e.g. static receiver from bytecodes.
897 actual_receiver = ikl;
898 // Is the actual_receiver exact?
899 actual_receiver_is_exact = receiver_type->klass_is_exact();
900 }
901 }
902
903 ciInstanceKlass* calling_klass = caller->holder();
904 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
905 if (cha_monomorphic_target != NULL) {
906 assert(!cha_monomorphic_target->is_abstract(), "");
907 // Look at the method-receiver type. Does it add "too much information"?
908 ciKlass* mr_klass = cha_monomorphic_target->holder();
909 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
910 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
911 // Calling this method would include an implicit cast to its holder.
912 // %%% Not yet implemented. Would throw minor asserts at present.
913 // %%% The most common wins are already gained by +UseUniqueSubclasses.
914 // To fix, put the higher_equal check at the call of this routine,
915 // and add a CheckCastPP to the receiver.
916 if (TraceDependencies) {
917 tty->print_cr("found unique CHA method, but could not cast up");
918 tty->print(" method = ");
919 cha_monomorphic_target->print();
920 tty->cr();
921 }
922 if (C->log() != NULL) {
923 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
924 C->log()->identify(klass),
925 C->log()->identify(cha_monomorphic_target));
926 }
927 cha_monomorphic_target = NULL;
928 }
929 }
930 if (cha_monomorphic_target != NULL) {
931 // Hardwiring a virtual.
932 // If we inlined because CHA revealed only a single target method,
933 // then we are dependent on that target method not getting overridden
934 // by dynamic class loading. Be sure to test the "static" receiver
935 // dest_method here, as opposed to the actual receiver, which may
936 // falsely lead us to believe that the receiver is final or private.
937 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
938 return cha_monomorphic_target;
939 }
940
941 // If the type is exact, we can still bind the method w/o a vcall.
942 // (This case comes after CHA so we can see how much extra work it does.)
943 if (actual_receiver_is_exact) {
944 // In case of evolution, there is a dependence on every inlined method, since each
945 // such method can be changed when its class is redefined.
946 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
947 if (exact_method != NULL) {
948 #ifndef PRODUCT
949 if (PrintOpto) {
950 tty->print(" Calling method via exact type @%d --- ", bci);
951 exact_method->print_name();
952 tty->cr();
953 }
954 #endif
955 return exact_method;
956 }
957 }
958
959 return NULL;
960 }