1 /*
2 * Copyright (c) 1998, 2013, 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/ciCallSite.hpp"
27 #include "ci/ciMethodHandle.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "opto/addnode.hpp"
33 #include "opto/callGenerator.hpp"
34 #include "opto/cfgnode.hpp"
35 #include "opto/mulnode.hpp"
36 #include "opto/parse.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39 #include "opto/subnode.hpp"
40 #include "prims/nativeLookup.hpp"
41 #include "runtime/sharedRuntime.hpp"
42
43 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
44 if (TraceTypeProfile || C->print_inlining()) {
45 outputStream* out = tty;
46 if (!C->print_inlining()) {
47 if (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) {
48 method->print_short_name();
49 tty->cr();
50 }
51 CompileTask::print_inlining(prof_method, depth, bci);
52 } else {
53 out = C->print_inlining_stream();
54 }
55 CompileTask::print_inline_indent(depth, out);
56 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
57 stringStream ss;
58 prof_klass->name()->print_symbol_on(&ss);
59 out->print(ss.as_string());
60 out->cr();
61 }
62 }
63
64 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
65 JVMState* jvms, bool allow_inline,
66 float prof_factor, ciKlass* speculative_receiver_type,
67 bool allow_intrinsics, bool delayed_forbidden) {
68 ciMethod* caller = jvms->method();
69 int bci = jvms->bci();
70 Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
71 guarantee(callee != NULL, "failed method resolution");
72
73 // Dtrace currently doesn't work unless all calls are vanilla
74 if (env()->dtrace_method_probes()) {
75 allow_inline = false;
76 }
77
78 // Note: When we get profiling during stage-1 compiles, we want to pull
79 // from more specific profile data which pertains to this inlining.
80 // Right now, ignore the information in jvms->caller(), and do method[bci].
81 ciCallProfile profile = caller->call_profile_at_bci(bci);
82
83 // See how many times this site has been invoked.
84 int site_count = profile.count();
85 int receiver_count = -1;
86 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
87 // Receivers in the profile structure are ordered by call counts
88 // so that the most called (major) receiver is profile.receiver(0).
89 receiver_count = profile.receiver_count(0);
90 }
91
92 CompileLog* log = this->log();
93 if (log != NULL) {
94 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
95 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
96 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
97 log->identify(callee), site_count, prof_factor);
98 if (call_does_dispatch) log->print(" virtual='1'");
99 if (allow_inline) log->print(" inline='1'");
100 if (receiver_count >= 0) {
101 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
102 if (profile.has_receiver(1)) {
103 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
104 }
105 }
106 log->end_elem();
107 }
108
109 // Special case the handling of certain common, profitable library
110 // methods. If these methods are replaced with specialized code,
111 // then we return it as the inlined version of the call.
112 // We do this before the strict f.p. check below because the
113 // intrinsics handle strict f.p. correctly.
114 CallGenerator* cg_intrinsic = NULL;
115 if (allow_inline && allow_intrinsics) {
116 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
117 if (cg != NULL) {
118 if (cg->is_predicted()) {
119 // Code without intrinsic but, hopefully, inlined.
120 CallGenerator* inline_cg = this->call_generator(callee,
121 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
122 if (inline_cg != NULL) {
123 cg = CallGenerator::for_predicted_intrinsic(cg, inline_cg);
124 }
125 }
126
127 // If intrinsic does the virtual dispatch, we try to use the type profile
128 // first, and hopefully inline it as the regular virtual call below.
129 // We will retry the intrinsic if nothing had claimed it afterwards.
130 if (cg->does_virtual_dispatch()) {
131 cg_intrinsic = cg;
132 cg = NULL;
133 } else {
134 return cg;
135 }
136 }
137 }
138
139 // Do method handle calls.
140 // NOTE: This must happen before normal inlining logic below since
141 // MethodHandle.invoke* are native methods which obviously don't
142 // have bytecodes and so normal inlining fails.
143 if (callee->is_method_handle_intrinsic()) {
144 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden);
145 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator");
146 return cg;
147 }
148
149 // Do not inline strict fp into non-strict code, or the reverse
150 if (caller->is_strict() ^ callee->is_strict()) {
151 allow_inline = false;
152 }
153
154 // Attempt to inline...
155 if (allow_inline) {
156 // The profile data is only partly attributable to this caller,
157 // scale back the call site information.
158 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
159 // This is the number of times we expect the call code to be used.
160 float expected_uses = past_uses;
161
162 // Try inlining a bytecoded method:
163 if (!call_does_dispatch) {
164 InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
165 WarmCallInfo scratch_ci;
166 bool should_delay = false;
167 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay);
168 assert(ci != &scratch_ci, "do not let this pointer escape");
169 bool allow_inline = (ci != NULL && !ci->is_cold());
170 bool require_inline = (allow_inline && ci->is_hot());
171
172 if (allow_inline) {
173 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
174
175 if (require_inline && cg != NULL) {
176 // Delay the inlining of this method to give us the
177 // opportunity to perform some high level optimizations
178 // first.
179 if (should_delay_string_inlining(callee, jvms)) {
180 assert(!delayed_forbidden, "strange");
181 return CallGenerator::for_string_late_inline(callee, cg);
182 } else if (should_delay_boxing_inlining(callee, jvms)) {
183 assert(!delayed_forbidden, "strange");
184 return CallGenerator::for_boxing_late_inline(callee, cg);
185 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) {
186 return CallGenerator::for_late_inline(callee, cg);
187 }
188 }
189 if (cg == NULL || should_delay) {
190 // Fall through.
191 } else if (require_inline || !InlineWarmCalls) {
192 return cg;
193 } else {
194 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor);
195 return CallGenerator::for_warm_call(ci, cold_cg, cg);
196 }
197 }
198 }
199
200 // Try using the type profile.
201 if (call_does_dispatch && site_count > 0 && receiver_count > 0) {
202 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
203 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
204 ciMethod* receiver_method = NULL;
205
206 int morphism = profile.morphism();
207 if (speculative_receiver_type != NULL) {
208 // We have a speculative type, we should be able to resolve
209 // the call. We do that before looking at the profiling at
210 // this invoke because it may lead to bimorphic inlining which
211 // a speculative type should help us avoid.
212 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
213 speculative_receiver_type);
214 if (receiver_method == NULL) {
215 speculative_receiver_type = NULL;
216 } else {
217 morphism = 1;
218 }
219 }
220 if (receiver_method == NULL &&
221 (have_major_receiver || morphism == 1 ||
222 (morphism == 2 && UseBimorphicInlining))) {
223 // receiver_method = profile.method();
224 // Profiles do not suggest methods now. Look it up in the major receiver.
225 receiver_method = callee->resolve_invoke(jvms->method()->holder(),
226 profile.receiver(0));
227 }
228 if (receiver_method != NULL) {
229 // The single majority receiver sufficiently outweighs the minority.
230 CallGenerator* hit_cg = this->call_generator(receiver_method,
231 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
232 if (hit_cg != NULL) {
233 // Look up second receiver.
234 CallGenerator* next_hit_cg = NULL;
235 ciMethod* next_receiver_method = NULL;
236 if (morphism == 2 && UseBimorphicInlining) {
237 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
238 profile.receiver(1));
239 if (next_receiver_method != NULL) {
240 next_hit_cg = this->call_generator(next_receiver_method,
241 vtable_index, !call_does_dispatch, jvms,
242 allow_inline, prof_factor);
243 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
244 have_major_receiver && UseOnlyInlinedBimorphic) {
245 // Skip if we can't inline second receiver's method
246 next_hit_cg = NULL;
247 }
248 }
249 }
250 CallGenerator* miss_cg;
251 Deoptimization::DeoptReason reason = morphism == 2 ?
252 Deoptimization::Reason_bimorphic :
253 (speculative_receiver_type == NULL ? Deoptimization::Reason_class_check : Deoptimization::Reason_speculate_class_check);
254 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
255 !too_many_traps(jvms->method(), jvms->bci(), reason)
256 ) {
257 // Generate uncommon trap for class check failure path
258 // in case of monomorphic or bimorphic virtual call site.
259 miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
260 Deoptimization::Action_maybe_recompile);
261 } else {
262 // Generate virtual call for class check failure path
263 // in case of polymorphic virtual call site.
264 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index);
265 }
266 if (miss_cg != NULL) {
267 if (next_hit_cg != NULL) {
268 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
269 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
270 // We don't need to record dependency on a receiver here and below.
271 // Whenever we inline, the dependency is added by Parse::Parse().
272 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
273 }
274 if (miss_cg != NULL) {
275 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count);
276 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
277 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
278 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
279 if (cg != NULL) return cg;
280 }
281 }
282 }
283 }
284 }
285 }
286
287 // Nothing claimed the intrinsic, we go with straight-forward inlining
288 // for already discovered intrinsic.
289 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) {
290 assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
291 return cg_intrinsic;
292 }
293
294 // There was no special inlining tactic, or it bailed out.
295 // Use a more generic tactic, like a simple call.
296 if (call_does_dispatch) {
297 const char* msg = "virtual call";
298 if (PrintInlining) print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
299 return CallGenerator::for_virtual_call(callee, vtable_index);
300 } else {
301 // Class Hierarchy Analysis or Type Profile reveals a unique target,
302 // or it is a static or special call.
303 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
304 }
305 }
306
307 // Return true for methods that shouldn't be inlined early so that
308 // they are easier to analyze and optimize as intrinsics.
309 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
310 if (has_stringbuilder()) {
311
312 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
313 call_method->holder() == C->env()->StringBuffer_klass()) &&
314 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
315 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
316 // Delay SB calls only when called from non-SB code
317 return false;
318 }
319
320 switch (call_method->intrinsic_id()) {
321 case vmIntrinsics::_StringBuilder_void:
322 case vmIntrinsics::_StringBuilder_int:
323 case vmIntrinsics::_StringBuilder_String:
324 case vmIntrinsics::_StringBuilder_append_char:
325 case vmIntrinsics::_StringBuilder_append_int:
326 case vmIntrinsics::_StringBuilder_append_String:
327 case vmIntrinsics::_StringBuilder_toString:
328 case vmIntrinsics::_StringBuffer_void:
329 case vmIntrinsics::_StringBuffer_int:
330 case vmIntrinsics::_StringBuffer_String:
331 case vmIntrinsics::_StringBuffer_append_char:
332 case vmIntrinsics::_StringBuffer_append_int:
333 case vmIntrinsics::_StringBuffer_append_String:
334 case vmIntrinsics::_StringBuffer_toString:
335 case vmIntrinsics::_Integer_toString:
336 return true;
337
338 case vmIntrinsics::_String_String:
339 {
340 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
341 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
342 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
343 ciMethod* m = csj->method();
344 if (m != NULL &&
345 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
346 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
347 // Delay String.<init>(new SB())
348 return true;
349 }
350 return false;
351 }
352
353 default:
354 return false;
355 }
356 }
357 return false;
358 }
359
360 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
361 if (eliminate_boxing() && call_method->is_boxing_method()) {
362 set_has_boxed_value(true);
363 return true;
364 }
365 return false;
366 }
367
368 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
369 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
370 // Additional inputs to consider...
371 // bc = bc()
372 // caller = method()
373 // iter().get_method_holder_index()
374 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
375 // Interface classes can be loaded & linked and never get around to
376 // being initialized. Uncommon-trap for not-initialized static or
377 // v-calls. Let interface calls happen.
378 ciInstanceKlass* holder_klass = dest_method->holder();
379 if (!holder_klass->is_being_initialized() &&
380 !holder_klass->is_initialized() &&
381 !holder_klass->is_interface()) {
382 uncommon_trap(Deoptimization::Reason_uninitialized,
383 Deoptimization::Action_reinterpret,
384 holder_klass);
385 return true;
386 }
387
388 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
389 return false;
390 }
391
392
393 //------------------------------do_call----------------------------------------
394 // Handle your basic call. Inline if we can & want to, else just setup call.
395 void Parse::do_call() {
396 // It's likely we are going to add debug info soon.
397 // Also, if we inline a guy who eventually needs debug info for this JVMS,
398 // our contribution to it is cleaned up right here.
399 kill_dead_locals();
400
401 C->print_inlining_assert_ready();
402
403 // Set frequently used booleans
404 const bool is_virtual = bc() == Bytecodes::_invokevirtual;
405 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
406 const bool has_receiver = Bytecodes::has_receiver(bc());
407
408 // Find target being called
409 bool will_link;
410 ciSignature* declared_signature = NULL;
411 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode
412 ciInstanceKlass* holder_klass = orig_callee->holder();
413 ciKlass* holder = iter().get_declared_method_holder();
414 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
415 assert(declared_signature != NULL, "cannot be null");
416
417 // uncommon-trap when callee is unloaded, uninitialized or will not link
418 // bailout when too many arguments for register representation
419 if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
420 #ifndef PRODUCT
421 if (PrintOpto && (Verbose || WizardMode)) {
422 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
423 orig_callee->print_name(); tty->cr();
424 }
425 #endif
426 return;
427 }
428 assert(holder_klass->is_loaded(), "");
429 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw)
430 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
431 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
432 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
433 // Note: In the absence of miranda methods, an abstract class K can perform
434 // an invokevirtual directly on an interface method I.m if K implements I.
435
436 // orig_callee is the resolved callee which's signature includes the
437 // appendix argument.
438 const int nargs = orig_callee->arg_size();
439 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
440
441 // Push appendix argument (MethodType, CallSite, etc.), if one.
442 if (iter().has_appendix()) {
443 ciObject* appendix_arg = iter().get_appendix();
444 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg);
445 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
446 push(appendix_arg_node);
447 }
448
449 // ---------------------
450 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
451 // Then we may inline or make a static call, but become dependent on there being only 1 target.
452 // Does the call-site type profile reveal only one receiver?
453 // Then we may introduce a run-time check and inline on the path where it succeeds.
454 // The other path may uncommon_trap, check for another receiver, or do a v-call.
455
456 // Try to get the most accurate receiver type
457 ciMethod* callee = orig_callee;
458 int vtable_index = Method::invalid_vtable_index;
459 bool call_does_dispatch = false;
460
461 // Speculative type of the receiver if any
462 ciKlass* speculative_receiver_type = NULL;
463 if (is_virtual_or_interface) {
464 Node* receiver_node = stack(sp() - nargs);
465 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
466 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
467 callee = C->optimize_virtual_call(method(), bci(), klass, orig_callee, receiver_type,
468 is_virtual,
469 call_does_dispatch, vtable_index); // out-parameters
470 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
471 }
472
473 // Note: It's OK to try to inline a virtual call.
474 // The call generator will not attempt to inline a polymorphic call
475 // unless it knows how to optimize the receiver dispatch.
476 bool try_inline = (C->do_inlining() || InlineAccessors);
477
478 // ---------------------
479 dec_sp(nargs); // Temporarily pop args for JVM state of call
480 JVMState* jvms = sync_jvms();
481
482 // ---------------------
483 // Decide call tactic.
484 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
485 // It decides whether inlining is desirable or not.
486 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
487
488 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead.
489 orig_callee = callee = NULL;
490
491 // ---------------------
492 // Round double arguments before call
493 round_double_arguments(cg->method());
494
495 // Feed profiling data for arguments to the type system so it can
496 // propagate it as speculative types
497 record_profiled_arguments_for_speculation(cg->method(), bc());
498
499 #ifndef PRODUCT
500 // bump global counters for calls
501 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
502
503 // Record first part of parsing work for this call
504 parse_histogram()->record_change();
505 #endif // not PRODUCT
506
507 assert(jvms == this->jvms(), "still operating on the right JVMS");
508 assert(jvms_in_sync(), "jvms must carry full info into CG");
509
510 // save across call, for a subsequent cast_not_null.
511 Node* receiver = has_receiver ? argument(0) : NULL;
512
513 // The extra CheckCastPP for speculative types mess with PhaseStringOpts
514 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) {
515 // Feed profiling data for a single receiver to the type system so
516 // it can propagate it as a speculative type
517 receiver = record_profiled_receiver_for_speculation(receiver);
518 }
519
520 // Bump method data counters (We profile *before* the call is made
521 // because exceptions don't return to the call site.)
522 profile_call(receiver);
523
524 JVMState* new_jvms = cg->generate(jvms, this);
525 if (new_jvms == NULL) {
526 // When inlining attempt fails (e.g., too many arguments),
527 // it may contaminate the current compile state, making it
528 // impossible to pull back and try again. Once we call
529 // cg->generate(), we are committed. If it fails, the whole
530 // compilation task is compromised.
531 if (failing()) return;
532
533 // This can happen if a library intrinsic is available, but refuses
534 // the call site, perhaps because it did not match a pattern the
535 // intrinsic was expecting to optimize. Should always be possible to
536 // get a normal java call that may inline in that case
537 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
538 new_jvms = cg->generate(jvms, this);
539 if (new_jvms == NULL) {
540 guarantee(failing(), "call failed to generate: calls should work");
541 return;
542 }
543 }
544
545 if (cg->is_inline()) {
546 // Accumulate has_loops estimate
547 C->set_has_loops(C->has_loops() || cg->method()->has_loops());
548 C->env()->notice_inlined_method(cg->method());
549 }
550
551 // Reset parser state from [new_]jvms, which now carries results of the call.
552 // Return value (if any) is already pushed on the stack by the cg.
553 add_exception_states_from(new_jvms);
554 if (new_jvms->map()->control() == top()) {
555 stop_and_kill_map();
556 } else {
557 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
558 set_jvms(new_jvms);
559 }
560
561 if (!stopped()) {
562 // This was some sort of virtual call, which did a null check for us.
563 // Now we can assert receiver-not-null, on the normal return path.
564 if (receiver != NULL && cg->is_virtual()) {
565 Node* cast = cast_not_null(receiver);
566 // %%% assert(receiver == cast, "should already have cast the receiver");
567 }
568
569 // Round double result after a call from strict to non-strict code
570 round_double_result(cg->method());
571
572 ciType* rtype = cg->method()->return_type();
573 ciType* ctype = declared_signature->return_type();
574
575 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
576 // Be careful here with return types.
577 if (ctype != rtype) {
578 BasicType rt = rtype->basic_type();
579 BasicType ct = ctype->basic_type();
580 if (ct == T_VOID) {
581 // It's OK for a method to return a value that is discarded.
582 // The discarding does not require any special action from the caller.
583 // The Java code knows this, at VerifyType.isNullConversion.
584 pop_node(rt); // whatever it was, pop it
585 } else if (rt == T_INT || is_subword_type(rt)) {
586 // Nothing. These cases are handled in lambda form bytecode.
587 assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct)));
588 } else if (rt == T_OBJECT || rt == T_ARRAY) {
589 assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct)));
590 if (ctype->is_loaded()) {
591 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
592 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
593 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
594 Node* retnode = pop();
595 Node* cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), retnode, sig_type));
596 push(cast_obj);
597 }
598 }
599 } else {
600 assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct)));
601 // push a zero; it's better than getting an oop/int mismatch
602 pop_node(rt);
603 Node* retnode = zerocon(ct);
604 push_node(ct, retnode);
605 }
606 // Now that the value is well-behaved, continue with the call-site type.
607 rtype = ctype;
608 }
609 } else {
610 // Symbolic resolution enforces the types to be the same.
611 // NOTE: We must relax the assert for unloaded types because two
612 // different ciType instances of the same unloaded class type
613 // can appear to be "loaded" by different loaders (depending on
614 // the accessing class).
615 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
616 err_msg_res("mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name()));
617 }
618
619 // If the return type of the method is not loaded, assert that the
620 // value we got is a null. Otherwise, we need to recompile.
621 if (!rtype->is_loaded()) {
622 #ifndef PRODUCT
623 if (PrintOpto && (Verbose || WizardMode)) {
624 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
625 cg->method()->print_name(); tty->cr();
626 }
627 #endif
628 if (C->log() != NULL) {
629 C->log()->elem("assert_null reason='return' klass='%d'",
630 C->log()->identify(rtype));
631 }
632 // If there is going to be a trap, put it at the next bytecode:
633 set_bci(iter().next_bci());
634 null_assert(peek());
635 set_bci(iter().cur_bci()); // put it back
636 }
637 BasicType ct = ctype->basic_type();
638 if (ct == T_OBJECT || ct == T_ARRAY) {
639 ciKlass* better_type = method()->return_profiled_type(bci());
640 if (UseTypeSpeculation && better_type != NULL) {
641 // If profiling reports a single type for the return value,
642 // feed it to the type system so it can propagate it as a
643 // speculative type
644 record_profile_for_speculation(stack(sp()-1), better_type);
645 }
646 }
647 }
648
649 // Restart record of parsing work after possible inlining of call
650 #ifndef PRODUCT
651 parse_histogram()->set_initial_state(bc());
652 #endif
653 }
654
655 //---------------------------catch_call_exceptions-----------------------------
656 // Put a Catch and CatchProj nodes behind a just-created call.
657 // Send their caught exceptions to the proper handler.
658 // This may be used after a call to the rethrow VM stub,
659 // when it is needed to process unloaded exception classes.
660 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
661 // Exceptions are delivered through this channel:
662 Node* i_o = this->i_o();
663
664 // Add a CatchNode.
665 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
666 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
667 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
668
669 for (; !handlers.is_done(); handlers.next()) {
670 ciExceptionHandler* h = handlers.handler();
671 int h_bci = h->handler_bci();
672 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
673 // Do not introduce unloaded exception types into the graph:
674 if (!h_klass->is_loaded()) {
675 if (saw_unloaded->contains(h_bci)) {
676 /* We've already seen an unloaded exception with h_bci,
677 so don't duplicate. Duplication will cause the CatchNode to be
678 unnecessarily large. See 4713716. */
679 continue;
680 } else {
681 saw_unloaded->append(h_bci);
682 }
683 }
684 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
685 // (We use make_from_klass because it respects UseUniqueSubclasses.)
686 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
687 assert(!h_extype->empty(), "sanity");
688 // Note: It's OK if the BCIs repeat themselves.
689 bcis->append(h_bci);
690 extypes->append(h_extype);
691 }
692
693 int len = bcis->length();
694 CatchNode *cn = new (C) CatchNode(control(), i_o, len+1);
695 Node *catch_ = _gvn.transform(cn);
696
697 // now branch with the exception state to each of the (potential)
698 // handlers
699 for(int i=0; i < len; i++) {
700 // Setup JVM state to enter the handler.
701 PreserveJVMState pjvms(this);
702 // Locals are just copied from before the call.
703 // Get control from the CatchNode.
704 int handler_bci = bcis->at(i);
705 Node* ctrl = _gvn.transform( new (C) CatchProjNode(catch_, i+1,handler_bci));
706 // This handler cannot happen?
707 if (ctrl == top()) continue;
708 set_control(ctrl);
709
710 // Create exception oop
711 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
712 Node *ex_oop = _gvn.transform(new (C) CreateExNode(extypes->at(i), ctrl, i_o));
713
714 // Handle unloaded exception classes.
715 if (saw_unloaded->contains(handler_bci)) {
716 // An unloaded exception type is coming here. Do an uncommon trap.
717 #ifndef PRODUCT
718 // We do not expect the same handler bci to take both cold unloaded
719 // and hot loaded exceptions. But, watch for it.
720 if ((Verbose || WizardMode) && extype->is_loaded()) {
721 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
722 method()->print_name(); tty->cr();
723 } else if (PrintOpto && (Verbose || WizardMode)) {
724 tty->print("Bailing out on unloaded exception type ");
725 extype->klass()->print_name();
726 tty->print(" at bci:%d in ", bci());
727 method()->print_name(); tty->cr();
728 }
729 #endif
730 // Emit an uncommon trap instead of processing the block.
731 set_bci(handler_bci);
732 push_ex_oop(ex_oop);
733 uncommon_trap(Deoptimization::Reason_unloaded,
734 Deoptimization::Action_reinterpret,
735 extype->klass(), "!loaded exception");
736 set_bci(iter().cur_bci()); // put it back
737 continue;
738 }
739
740 // go to the exception handler
741 if (handler_bci < 0) { // merge with corresponding rethrow node
742 throw_to_exit(make_exception_state(ex_oop));
743 } else { // Else jump to corresponding handle
744 push_ex_oop(ex_oop); // Clear stack and push just the oop.
745 merge_exception(handler_bci);
746 }
747 }
748
749 // The first CatchProj is for the normal return.
750 // (Note: If this is a call to rethrow_Java, this node goes dead.)
751 set_control(_gvn.transform( new (C) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
752 }
753
754
755 //----------------------------catch_inline_exceptions--------------------------
756 // Handle all exceptions thrown by an inlined method or individual bytecode.
757 // Common case 1: we have no handler, so all exceptions merge right into
758 // the rethrow case.
759 // Case 2: we have some handlers, with loaded exception klasses that have
760 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
761 // exception oop and branch to the handler directly.
762 // Case 3: We have some handlers with subklasses or are not loaded at
763 // compile-time. We have to call the runtime to resolve the exception.
764 // So we insert a RethrowCall and all the logic that goes with it.
765 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
766 // Caller is responsible for saving away the map for normal control flow!
767 assert(stopped(), "call set_map(NULL) first");
768 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
769
770 Node* ex_node = saved_ex_oop(ex_map);
771 if (ex_node == top()) {
772 // No action needed.
773 return;
774 }
775 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
776 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
777 if (ex_type == NULL)
778 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
779
780 // determine potential exception handlers
781 ciExceptionHandlerStream handlers(method(), bci(),
782 ex_type->klass()->as_instance_klass(),
783 ex_type->klass_is_exact());
784
785 // Start executing from the given throw state. (Keep its stack, for now.)
786 // Get the exception oop as known at compile time.
787 ex_node = use_exception_state(ex_map);
788
789 // Get the exception oop klass from its header
790 Node* ex_klass_node = NULL;
791 if (has_ex_handler() && !ex_type->klass_is_exact()) {
792 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
793 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
794
795 // Compute the exception klass a little more cleverly.
796 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
797 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
798 // each arm of the Phi. If I know something clever about the exceptions
799 // I'm loading the class from, I can replace the LoadKlass with the
800 // klass constant for the exception oop.
801 if( ex_node->is_Phi() ) {
802 ex_klass_node = new (C) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
803 for( uint i = 1; i < ex_node->req(); i++ ) {
804 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
805 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
806 ex_klass_node->init_req( i, k );
807 }
808 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
809
810 }
811 }
812
813 // Scan the exception table for applicable handlers.
814 // If none, we can call rethrow() and be done!
815 // If precise (loaded with no subklasses), insert a D.S. style
816 // pointer compare to the correct handler and loop back.
817 // If imprecise, switch to the Rethrow VM-call style handling.
818
819 int remaining = handlers.count_remaining();
820
821 // iterate through all entries sequentially
822 for (;!handlers.is_done(); handlers.next()) {
823 ciExceptionHandler* handler = handlers.handler();
824
825 if (handler->is_rethrow()) {
826 // If we fell off the end of the table without finding an imprecise
827 // exception klass (and without finding a generic handler) then we
828 // know this exception is not handled in this method. We just rethrow
829 // the exception into the caller.
830 throw_to_exit(make_exception_state(ex_node));
831 return;
832 }
833
834 // exception handler bci range covers throw_bci => investigate further
835 int handler_bci = handler->handler_bci();
836
837 if (remaining == 1) {
838 push_ex_oop(ex_node); // Push exception oop for handler
839 #ifndef PRODUCT
840 if (PrintOpto && WizardMode) {
841 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
842 }
843 #endif
844 merge_exception(handler_bci); // jump to handler
845 return; // No more handling to be done here!
846 }
847
848 // Get the handler's klass
849 ciInstanceKlass* klass = handler->catch_klass();
850
851 if (!klass->is_loaded()) { // klass is not loaded?
852 // fall through into catch_call_exceptions which will emit a
853 // handler with an uncommon trap.
854 break;
855 }
856
857 if (klass->is_interface()) // should not happen, but...
858 break; // bail out
859
860 // Check the type of the exception against the catch type
861 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
862 Node* con = _gvn.makecon(tk);
863 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
864 if (!stopped()) {
865 PreserveJVMState pjvms(this);
866 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
867 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
868 Node* ex_oop = _gvn.transform(new (C) CheckCastPPNode(control(), ex_node, tinst));
869 push_ex_oop(ex_oop); // Push exception oop for handler
870 #ifndef PRODUCT
871 if (PrintOpto && WizardMode) {
872 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
873 klass->print_name();
874 tty->cr();
875 }
876 #endif
877 merge_exception(handler_bci);
878 }
879 set_control(not_subtype_ctrl);
880
881 // Come here if exception does not match handler.
882 // Carry on with more handler checks.
883 --remaining;
884 }
885
886 assert(!stopped(), "you should return if you finish the chain");
887
888 // Oops, need to call into the VM to resolve the klasses at runtime.
889 // Note: This call must not deoptimize, since it is not a real at this bci!
890 kill_dead_locals();
891
892 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
893 OptoRuntime::rethrow_Type(),
894 OptoRuntime::rethrow_stub(),
895 NULL, NULL,
896 ex_node);
897
898 // Rethrow is a pure call, no side effects, only a result.
899 // The result cannot be allocated, so we use I_O
900
901 // Catch exceptions from the rethrow
902 catch_call_exceptions(handlers);
903 }
904
905
906 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
907
908
909 #ifndef PRODUCT
910 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
911 if( CountCompiledCalls ) {
912 if( at_method_entry ) {
913 // bump invocation counter if top method (for statistics)
914 if (CountCompiledCalls && depth() == 1) {
915 const TypePtr* addr_type = TypeMetadataPtr::make(method());
916 Node* adr1 = makecon(addr_type);
917 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
918 increment_counter(adr2);
919 }
920 } else if (is_inline) {
921 switch (bc()) {
922 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
923 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
924 case Bytecodes::_invokestatic:
925 case Bytecodes::_invokedynamic:
926 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
927 default: fatal("unexpected call bytecode");
928 }
929 } else {
930 switch (bc()) {
931 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
932 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
933 case Bytecodes::_invokestatic:
934 case Bytecodes::_invokedynamic:
935 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
936 default: fatal("unexpected call bytecode");
937 }
938 }
939 }
940 }
941 #endif //PRODUCT
942
943
944 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass,
945 ciMethod* callee, const TypeOopPtr* receiver_type,
946 bool is_virtual,
947 bool& call_does_dispatch, int& vtable_index) {
948 // Set default values for out-parameters.
949 call_does_dispatch = true;
950 vtable_index = Method::invalid_vtable_index;
951
952 // Choose call strategy.
953 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, receiver_type);
954
955 // Have the call been sufficiently improved such that it is no longer a virtual?
956 if (optimized_virtual_method != NULL) {
957 callee = optimized_virtual_method;
958 call_does_dispatch = false;
959 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
960 // We can make a vtable call at this site
961 vtable_index = callee->resolve_vtable_index(caller->holder(), klass);
962 }
963 return callee;
964 }
965
966 // Identify possible target method and inlining style
967 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
968 ciMethod* callee, const TypeOopPtr* receiver_type) {
969 // only use for virtual or interface calls
970
971 // If it is obviously final, do not bother to call find_monomorphic_target,
972 // because the class hierarchy checks are not needed, and may fail due to
973 // incompletely loaded classes. Since we do our own class loading checks
974 // in this module, we may confidently bind to any method.
975 if (callee->can_be_statically_bound()) {
976 return callee;
977 }
978
979 // Attempt to improve the receiver
980 bool actual_receiver_is_exact = false;
981 ciInstanceKlass* actual_receiver = klass;
982 if (receiver_type != NULL) {
983 // Array methods are all inherited from Object, and are monomorphic.
984 if (receiver_type->isa_aryptr() &&
985 callee->holder() == env()->Object_klass()) {
986 return callee;
987 }
988
989 // All other interesting cases are instance klasses.
990 if (!receiver_type->isa_instptr()) {
991 return NULL;
992 }
993
994 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
995 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
996 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
997 // ikl is a same or better type than the original actual_receiver,
998 // e.g. static receiver from bytecodes.
999 actual_receiver = ikl;
1000 // Is the actual_receiver exact?
1001 actual_receiver_is_exact = receiver_type->klass_is_exact();
1002 }
1003 }
1004
1005 ciInstanceKlass* calling_klass = caller->holder();
1006 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver);
1007 if (cha_monomorphic_target != NULL) {
1008 assert(!cha_monomorphic_target->is_abstract(), "");
1009 // Look at the method-receiver type. Does it add "too much information"?
1010 ciKlass* mr_klass = cha_monomorphic_target->holder();
1011 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
1012 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
1013 // Calling this method would include an implicit cast to its holder.
1014 // %%% Not yet implemented. Would throw minor asserts at present.
1015 // %%% The most common wins are already gained by +UseUniqueSubclasses.
1016 // To fix, put the higher_equal check at the call of this routine,
1017 // and add a CheckCastPP to the receiver.
1018 if (TraceDependencies) {
1019 tty->print_cr("found unique CHA method, but could not cast up");
1020 tty->print(" method = ");
1021 cha_monomorphic_target->print();
1022 tty->cr();
1023 }
1024 if (log() != NULL) {
1025 log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
1026 log()->identify(klass),
1027 log()->identify(cha_monomorphic_target));
1028 }
1029 cha_monomorphic_target = NULL;
1030 }
1031 }
1032 if (cha_monomorphic_target != NULL) {
1033 // Hardwiring a virtual.
1034 // If we inlined because CHA revealed only a single target method,
1035 // then we are dependent on that target method not getting overridden
1036 // by dynamic class loading. Be sure to test the "static" receiver
1037 // dest_method here, as opposed to the actual receiver, which may
1038 // falsely lead us to believe that the receiver is final or private.
1039 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
1040 return cha_monomorphic_target;
1041 }
1042
1043 // If the type is exact, we can still bind the method w/o a vcall.
1044 // (This case comes after CHA so we can see how much extra work it does.)
1045 if (actual_receiver_is_exact) {
1046 // In case of evolution, there is a dependence on every inlined method, since each
1047 // such method can be changed when its class is redefined.
1048 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1049 if (exact_method != NULL) {
1050 #ifndef PRODUCT
1051 if (PrintOpto) {
1052 tty->print(" Calling method via exact type @%d --- ", bci);
1053 exact_method->print_name();
1054 tty->cr();
1055 }
1056 #endif
1057 return exact_method;
1058 }
1059 }
1060
1061 return NULL;
1062 }