Tue, 16 Aug 2011 04:14:05 -0700
7071653: JSR 292: call site change notification should be pushed not pulled
Reviewed-by: kvn, never, bdelsart
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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
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"
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
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 ciMethod* caller = jvms->method();
67 int bci = jvms->bci();
68 Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
69 guarantee(call_method != NULL, "failed method resolution");
71 // Dtrace currently doesn't work unless all calls are vanilla
72 if (env()->dtrace_method_probes()) {
73 allow_inline = false;
74 }
76 // Note: When we get profiling during stage-1 compiles, we want to pull
77 // from more specific profile data which pertains to this inlining.
78 // Right now, ignore the information in jvms->caller(), and do method[bci].
79 ciCallProfile profile = caller->call_profile_at_bci(bci);
81 // See how many times this site has been invoked.
82 int site_count = profile.count();
83 int receiver_count = -1;
84 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
85 // Receivers in the profile structure are ordered by call counts
86 // so that the most called (major) receiver is profile.receiver(0).
87 receiver_count = profile.receiver_count(0);
88 }
90 CompileLog* log = this->log();
91 if (log != NULL) {
92 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
93 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
94 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
95 log->identify(call_method), site_count, prof_factor);
96 if (call_is_virtual) log->print(" virtual='1'");
97 if (allow_inline) log->print(" inline='1'");
98 if (receiver_count >= 0) {
99 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
100 if (profile.has_receiver(1)) {
101 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
102 }
103 }
104 log->end_elem();
105 }
107 // Special case the handling of certain common, profitable library
108 // methods. If these methods are replaced with specialized code,
109 // then we return it as the inlined version of the call.
110 // We do this before the strict f.p. check below because the
111 // intrinsics handle strict f.p. correctly.
112 if (allow_inline) {
113 cg = find_intrinsic(call_method, call_is_virtual);
114 if (cg != NULL) return cg;
115 }
117 // Do method handle calls.
118 // NOTE: This must happen before normal inlining logic below since
119 // MethodHandle.invoke* are native methods which obviously don't
120 // have bytecodes and so normal inlining fails.
121 if (call_method->is_method_handle_invoke()) {
122 if (bytecode != Bytecodes::_invokedynamic) {
123 GraphKit kit(jvms);
124 Node* n = kit.argument(0);
126 CallGenerator* cg = CallGenerator::for_method_handle_inline(n, jvms, caller, call_method, profile);
127 if (cg != NULL) {
128 return cg;
129 }
130 return CallGenerator::for_direct_call(call_method);
131 }
132 else {
133 // Get the CallSite object.
134 ciMethod* caller_method = jvms->method();
135 ciBytecodeStream str(caller_method);
136 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci.
137 ciCallSite* call_site = str.get_call_site();
139 // Inline constant and mutable call sites. We don't inline
140 // volatile call sites optimistically since they are specified
141 // to change their value often and that would result in a lot of
142 // deoptimizations and recompiles.
143 if (call_site->is_constant_call_site() || call_site->is_mutable_call_site()) {
144 CallGenerator* cg = CallGenerator::for_invokedynamic_inline(call_site, jvms, caller, call_method, profile);
145 if (cg != NULL) {
146 return cg;
147 }
148 }
149 // If something failed, generate a normal dynamic call.
150 return CallGenerator::for_dynamic_call(call_method);
151 }
152 }
154 // Do not inline strict fp into non-strict code, or the reverse
155 bool caller_method_is_strict = jvms->method()->is_strict();
156 if( caller_method_is_strict ^ call_method->is_strict() ) {
157 allow_inline = false;
158 }
160 // Attempt to inline...
161 if (allow_inline) {
162 // The profile data is only partly attributable to this caller,
163 // scale back the call site information.
164 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
165 // This is the number of times we expect the call code to be used.
166 float expected_uses = past_uses;
168 // Try inlining a bytecoded method:
169 if (!call_is_virtual) {
170 InlineTree* ilt;
171 if (UseOldInlining) {
172 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
173 } else {
174 // Make a disembodied, stateless ILT.
175 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
176 float site_invoke_ratio = prof_factor;
177 // Note: ilt is for the root of this parse, not the present call site.
178 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel);
179 }
180 WarmCallInfo scratch_ci;
181 if (!UseOldInlining)
182 scratch_ci.init(jvms, call_method, profile, prof_factor);
183 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
184 assert(ci != &scratch_ci, "do not let this pointer escape");
185 bool allow_inline = (ci != NULL && !ci->is_cold());
186 bool require_inline = (allow_inline && ci->is_hot());
188 if (allow_inline) {
189 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
190 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) {
191 // Delay the inlining of this method to give us the
192 // opportunity to perform some high level optimizations
193 // first.
194 return CallGenerator::for_late_inline(call_method, cg);
195 }
196 if (cg == NULL) {
197 // Fall through.
198 } else if (require_inline || !InlineWarmCalls) {
199 return cg;
200 } else {
201 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
202 return CallGenerator::for_warm_call(ci, cold_cg, cg);
203 }
204 }
205 }
207 // Try using the type profile.
208 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
209 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
210 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
211 ciMethod* receiver_method = NULL;
212 if (have_major_receiver || profile.morphism() == 1 ||
213 (profile.morphism() == 2 && UseBimorphicInlining)) {
214 // receiver_method = profile.method();
215 // Profiles do not suggest methods now. Look it up in the major receiver.
216 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
217 profile.receiver(0));
218 }
219 if (receiver_method != NULL) {
220 // The single majority receiver sufficiently outweighs the minority.
221 CallGenerator* hit_cg = this->call_generator(receiver_method,
222 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
223 if (hit_cg != NULL) {
224 // Look up second receiver.
225 CallGenerator* next_hit_cg = NULL;
226 ciMethod* next_receiver_method = NULL;
227 if (profile.morphism() == 2 && UseBimorphicInlining) {
228 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
229 profile.receiver(1));
230 if (next_receiver_method != NULL) {
231 next_hit_cg = this->call_generator(next_receiver_method,
232 vtable_index, !call_is_virtual, jvms,
233 allow_inline, prof_factor);
234 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
235 have_major_receiver && UseOnlyInlinedBimorphic) {
236 // Skip if we can't inline second receiver's method
237 next_hit_cg = NULL;
238 }
239 }
240 }
241 CallGenerator* miss_cg;
242 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
243 Deoptimization::Reason_bimorphic :
244 Deoptimization::Reason_class_check;
245 if (( profile.morphism() == 1 ||
246 (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
247 !too_many_traps(jvms->method(), jvms->bci(), reason)
248 ) {
249 // Generate uncommon trap for class check failure path
250 // in case of monomorphic or bimorphic virtual call site.
251 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason,
252 Deoptimization::Action_maybe_recompile);
253 } else {
254 // Generate virtual call for class check failure path
255 // in case of polymorphic virtual call site.
256 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
257 }
258 if (miss_cg != NULL) {
259 if (next_hit_cg != NULL) {
260 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
261 // We don't need to record dependency on a receiver here and below.
262 // Whenever we inline, the dependency is added by Parse::Parse().
263 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
264 }
265 if (miss_cg != NULL) {
266 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
267 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
268 if (cg != NULL) return cg;
269 }
270 }
271 }
272 }
273 }
274 }
276 // There was no special inlining tactic, or it bailed out.
277 // Use a more generic tactic, like a simple call.
278 if (call_is_virtual) {
279 return CallGenerator::for_virtual_call(call_method, vtable_index);
280 } else {
281 // Class Hierarchy Analysis or Type Profile reveals a unique target,
282 // or it is a static or special call.
283 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms));
284 }
285 }
287 // Return true for methods that shouldn't be inlined early so that
288 // they are easier to analyze and optimize as intrinsics.
289 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
290 if (has_stringbuilder()) {
292 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
293 call_method->holder() == C->env()->StringBuffer_klass()) &&
294 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
295 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
296 // Delay SB calls only when called from non-SB code
297 return false;
298 }
300 switch (call_method->intrinsic_id()) {
301 case vmIntrinsics::_StringBuilder_void:
302 case vmIntrinsics::_StringBuilder_int:
303 case vmIntrinsics::_StringBuilder_String:
304 case vmIntrinsics::_StringBuilder_append_char:
305 case vmIntrinsics::_StringBuilder_append_int:
306 case vmIntrinsics::_StringBuilder_append_String:
307 case vmIntrinsics::_StringBuilder_toString:
308 case vmIntrinsics::_StringBuffer_void:
309 case vmIntrinsics::_StringBuffer_int:
310 case vmIntrinsics::_StringBuffer_String:
311 case vmIntrinsics::_StringBuffer_append_char:
312 case vmIntrinsics::_StringBuffer_append_int:
313 case vmIntrinsics::_StringBuffer_append_String:
314 case vmIntrinsics::_StringBuffer_toString:
315 case vmIntrinsics::_Integer_toString:
316 return true;
318 case vmIntrinsics::_String_String:
319 {
320 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
321 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
322 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
323 ciMethod* m = csj->method();
324 if (m != NULL &&
325 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
326 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
327 // Delay String.<init>(new SB())
328 return true;
329 }
330 return false;
331 }
333 default:
334 return false;
335 }
336 }
337 return false;
338 }
341 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
342 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
343 // Additional inputs to consider...
344 // bc = bc()
345 // caller = method()
346 // iter().get_method_holder_index()
347 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
348 // Interface classes can be loaded & linked and never get around to
349 // being initialized. Uncommon-trap for not-initialized static or
350 // v-calls. Let interface calls happen.
351 ciInstanceKlass* holder_klass = dest_method->holder();
352 if (!holder_klass->is_being_initialized() &&
353 !holder_klass->is_initialized() &&
354 !holder_klass->is_interface()) {
355 uncommon_trap(Deoptimization::Reason_uninitialized,
356 Deoptimization::Action_reinterpret,
357 holder_klass);
358 return true;
359 }
361 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
362 return false;
363 }
366 //------------------------------do_call----------------------------------------
367 // Handle your basic call. Inline if we can & want to, else just setup call.
368 void Parse::do_call() {
369 // It's likely we are going to add debug info soon.
370 // Also, if we inline a guy who eventually needs debug info for this JVMS,
371 // our contribution to it is cleaned up right here.
372 kill_dead_locals();
374 // Set frequently used booleans
375 bool is_virtual = bc() == Bytecodes::_invokevirtual;
376 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
377 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
378 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic;
380 // Find target being called
381 bool will_link;
382 ciMethod* dest_method = iter().get_method(will_link);
383 ciInstanceKlass* holder_klass = dest_method->holder();
384 ciKlass* holder = iter().get_declared_method_holder();
385 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
387 int nargs = dest_method->arg_size();
388 if (is_invokedynamic) nargs -= 1;
390 // uncommon-trap when callee is unloaded, uninitialized or will not link
391 // bailout when too many arguments for register representation
392 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
393 #ifndef PRODUCT
394 if (PrintOpto && (Verbose || WizardMode)) {
395 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
396 dest_method->print_name(); tty->cr();
397 }
398 #endif
399 return;
400 }
401 assert(holder_klass->is_loaded(), "");
402 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc");
403 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
404 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
405 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
406 // Note: In the absence of miranda methods, an abstract class K can perform
407 // an invokevirtual directly on an interface method I.m if K implements I.
409 // ---------------------
410 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
411 // Then we may inline or make a static call, but become dependent on there being only 1 target.
412 // Does the call-site type profile reveal only one receiver?
413 // Then we may introduce a run-time check and inline on the path where it succeeds.
414 // The other path may uncommon_trap, check for another receiver, or do a v-call.
416 // Choose call strategy.
417 bool call_is_virtual = is_virtual_or_interface;
418 int vtable_index = methodOopDesc::invalid_vtable_index;
419 ciMethod* call_method = dest_method;
421 // Try to get the most accurate receiver type
422 if (is_virtual_or_interface) {
423 Node* receiver_node = stack(sp() - nargs);
424 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
425 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
427 // Have the call been sufficiently improved such that it is no longer a virtual?
428 if (optimized_virtual_method != NULL) {
429 call_method = optimized_virtual_method;
430 call_is_virtual = false;
431 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
432 // We can make a vtable call at this site
433 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
434 }
435 }
437 // Note: It's OK to try to inline a virtual call.
438 // The call generator will not attempt to inline a polymorphic call
439 // unless it knows how to optimize the receiver dispatch.
440 bool try_inline = (C->do_inlining() || InlineAccessors);
442 // ---------------------
443 inc_sp(- nargs); // Temporarily pop args for JVM state of call
444 JVMState* jvms = sync_jvms();
446 // ---------------------
447 // Decide call tactic.
448 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
449 // It decides whether inlining is desirable or not.
450 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
452 // ---------------------
453 // Round double arguments before call
454 round_double_arguments(dest_method);
456 #ifndef PRODUCT
457 // bump global counters for calls
458 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
460 // Record first part of parsing work for this call
461 parse_histogram()->record_change();
462 #endif // not PRODUCT
464 assert(jvms == this->jvms(), "still operating on the right JVMS");
465 assert(jvms_in_sync(), "jvms must carry full info into CG");
467 // save across call, for a subsequent cast_not_null.
468 Node* receiver = has_receiver ? argument(0) : NULL;
470 // Bump method data counters (We profile *before* the call is made
471 // because exceptions don't return to the call site.)
472 profile_call(receiver);
474 JVMState* new_jvms;
475 if ((new_jvms = cg->generate(jvms)) == NULL) {
476 // When inlining attempt fails (e.g., too many arguments),
477 // it may contaminate the current compile state, making it
478 // impossible to pull back and try again. Once we call
479 // cg->generate(), we are committed. If it fails, the whole
480 // compilation task is compromised.
481 if (failing()) return;
482 #ifndef PRODUCT
483 if (PrintOpto || PrintOptoInlining || PrintInlining) {
484 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
485 if (cg->is_intrinsic() && call_method->code_size() > 0) {
486 tty->print("Bailed out of intrinsic, will not inline: ");
487 call_method->print_name(); tty->cr();
488 }
489 }
490 #endif
491 // This can happen if a library intrinsic is available, but refuses
492 // the call site, perhaps because it did not match a pattern the
493 // intrinsic was expecting to optimize. The fallback position is
494 // to call out-of-line.
495 try_inline = false; // Inline tactic bailed out.
496 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
497 if ((new_jvms = cg->generate(jvms)) == NULL) {
498 guarantee(failing(), "call failed to generate: calls should work");
499 return;
500 }
501 }
503 if (cg->is_inline()) {
504 // Accumulate has_loops estimate
505 C->set_has_loops(C->has_loops() || call_method->has_loops());
506 C->env()->notice_inlined_method(call_method);
507 }
509 // Reset parser state from [new_]jvms, which now carries results of the call.
510 // Return value (if any) is already pushed on the stack by the cg.
511 add_exception_states_from(new_jvms);
512 if (new_jvms->map()->control() == top()) {
513 stop_and_kill_map();
514 } else {
515 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
516 set_jvms(new_jvms);
517 }
519 if (!stopped()) {
520 // This was some sort of virtual call, which did a null check for us.
521 // Now we can assert receiver-not-null, on the normal return path.
522 if (receiver != NULL && cg->is_virtual()) {
523 Node* cast = cast_not_null(receiver);
524 // %%% assert(receiver == cast, "should already have cast the receiver");
525 }
527 // Round double result after a call from strict to non-strict code
528 round_double_result(dest_method);
530 // If the return type of the method is not loaded, assert that the
531 // value we got is a null. Otherwise, we need to recompile.
532 if (!dest_method->return_type()->is_loaded()) {
533 #ifndef PRODUCT
534 if (PrintOpto && (Verbose || WizardMode)) {
535 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
536 dest_method->print_name(); tty->cr();
537 }
538 #endif
539 if (C->log() != NULL) {
540 C->log()->elem("assert_null reason='return' klass='%d'",
541 C->log()->identify(dest_method->return_type()));
542 }
543 // If there is going to be a trap, put it at the next bytecode:
544 set_bci(iter().next_bci());
545 do_null_assert(peek(), T_OBJECT);
546 set_bci(iter().cur_bci()); // put it back
547 }
548 }
550 // Restart record of parsing work after possible inlining of call
551 #ifndef PRODUCT
552 parse_histogram()->set_initial_state(bc());
553 #endif
554 }
556 //---------------------------catch_call_exceptions-----------------------------
557 // Put a Catch and CatchProj nodes behind a just-created call.
558 // Send their caught exceptions to the proper handler.
559 // This may be used after a call to the rethrow VM stub,
560 // when it is needed to process unloaded exception classes.
561 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
562 // Exceptions are delivered through this channel:
563 Node* i_o = this->i_o();
565 // Add a CatchNode.
566 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
567 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
568 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
570 for (; !handlers.is_done(); handlers.next()) {
571 ciExceptionHandler* h = handlers.handler();
572 int h_bci = h->handler_bci();
573 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
574 // Do not introduce unloaded exception types into the graph:
575 if (!h_klass->is_loaded()) {
576 if (saw_unloaded->contains(h_bci)) {
577 /* We've already seen an unloaded exception with h_bci,
578 so don't duplicate. Duplication will cause the CatchNode to be
579 unnecessarily large. See 4713716. */
580 continue;
581 } else {
582 saw_unloaded->append(h_bci);
583 }
584 }
585 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
586 // (We use make_from_klass because it respects UseUniqueSubclasses.)
587 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
588 assert(!h_extype->empty(), "sanity");
589 // Note: It's OK if the BCIs repeat themselves.
590 bcis->append(h_bci);
591 extypes->append(h_extype);
592 }
594 int len = bcis->length();
595 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
596 Node *catch_ = _gvn.transform(cn);
598 // now branch with the exception state to each of the (potential)
599 // handlers
600 for(int i=0; i < len; i++) {
601 // Setup JVM state to enter the handler.
602 PreserveJVMState pjvms(this);
603 // Locals are just copied from before the call.
604 // Get control from the CatchNode.
605 int handler_bci = bcis->at(i);
606 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
607 // This handler cannot happen?
608 if (ctrl == top()) continue;
609 set_control(ctrl);
611 // Create exception oop
612 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
613 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
615 // Handle unloaded exception classes.
616 if (saw_unloaded->contains(handler_bci)) {
617 // An unloaded exception type is coming here. Do an uncommon trap.
618 #ifndef PRODUCT
619 // We do not expect the same handler bci to take both cold unloaded
620 // and hot loaded exceptions. But, watch for it.
621 if (extype->is_loaded()) {
622 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
623 method()->print_name(); tty->cr();
624 } else if (PrintOpto && (Verbose || WizardMode)) {
625 tty->print("Bailing out on unloaded exception type ");
626 extype->klass()->print_name();
627 tty->print(" at bci:%d in ", bci());
628 method()->print_name(); tty->cr();
629 }
630 #endif
631 // Emit an uncommon trap instead of processing the block.
632 set_bci(handler_bci);
633 push_ex_oop(ex_oop);
634 uncommon_trap(Deoptimization::Reason_unloaded,
635 Deoptimization::Action_reinterpret,
636 extype->klass(), "!loaded exception");
637 set_bci(iter().cur_bci()); // put it back
638 continue;
639 }
641 // go to the exception handler
642 if (handler_bci < 0) { // merge with corresponding rethrow node
643 throw_to_exit(make_exception_state(ex_oop));
644 } else { // Else jump to corresponding handle
645 push_ex_oop(ex_oop); // Clear stack and push just the oop.
646 merge_exception(handler_bci);
647 }
648 }
650 // The first CatchProj is for the normal return.
651 // (Note: If this is a call to rethrow_Java, this node goes dead.)
652 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
653 }
656 //----------------------------catch_inline_exceptions--------------------------
657 // Handle all exceptions thrown by an inlined method or individual bytecode.
658 // Common case 1: we have no handler, so all exceptions merge right into
659 // the rethrow case.
660 // Case 2: we have some handlers, with loaded exception klasses that have
661 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
662 // exception oop and branch to the handler directly.
663 // Case 3: We have some handlers with subklasses or are not loaded at
664 // compile-time. We have to call the runtime to resolve the exception.
665 // So we insert a RethrowCall and all the logic that goes with it.
666 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
667 // Caller is responsible for saving away the map for normal control flow!
668 assert(stopped(), "call set_map(NULL) first");
669 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
671 Node* ex_node = saved_ex_oop(ex_map);
672 if (ex_node == top()) {
673 // No action needed.
674 return;
675 }
676 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
677 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
678 if (ex_type == NULL)
679 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
681 // determine potential exception handlers
682 ciExceptionHandlerStream handlers(method(), bci(),
683 ex_type->klass()->as_instance_klass(),
684 ex_type->klass_is_exact());
686 // Start executing from the given throw state. (Keep its stack, for now.)
687 // Get the exception oop as known at compile time.
688 ex_node = use_exception_state(ex_map);
690 // Get the exception oop klass from its header
691 Node* ex_klass_node = NULL;
692 if (has_ex_handler() && !ex_type->klass_is_exact()) {
693 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
694 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
696 // Compute the exception klass a little more cleverly.
697 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
698 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
699 // each arm of the Phi. If I know something clever about the exceptions
700 // I'm loading the class from, I can replace the LoadKlass with the
701 // klass constant for the exception oop.
702 if( ex_node->is_Phi() ) {
703 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
704 for( uint i = 1; i < ex_node->req(); i++ ) {
705 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
706 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
707 ex_klass_node->init_req( i, k );
708 }
709 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
711 }
712 }
714 // Scan the exception table for applicable handlers.
715 // If none, we can call rethrow() and be done!
716 // If precise (loaded with no subklasses), insert a D.S. style
717 // pointer compare to the correct handler and loop back.
718 // If imprecise, switch to the Rethrow VM-call style handling.
720 int remaining = handlers.count_remaining();
722 // iterate through all entries sequentially
723 for (;!handlers.is_done(); handlers.next()) {
724 ciExceptionHandler* handler = handlers.handler();
726 if (handler->is_rethrow()) {
727 // If we fell off the end of the table without finding an imprecise
728 // exception klass (and without finding a generic handler) then we
729 // know this exception is not handled in this method. We just rethrow
730 // the exception into the caller.
731 throw_to_exit(make_exception_state(ex_node));
732 return;
733 }
735 // exception handler bci range covers throw_bci => investigate further
736 int handler_bci = handler->handler_bci();
738 if (remaining == 1) {
739 push_ex_oop(ex_node); // Push exception oop for handler
740 #ifndef PRODUCT
741 if (PrintOpto && WizardMode) {
742 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
743 }
744 #endif
745 merge_exception(handler_bci); // jump to handler
746 return; // No more handling to be done here!
747 }
749 // Get the handler's klass
750 ciInstanceKlass* klass = handler->catch_klass();
752 if (!klass->is_loaded()) { // klass is not loaded?
753 // fall through into catch_call_exceptions which will emit a
754 // handler with an uncommon trap.
755 break;
756 }
758 if (klass->is_interface()) // should not happen, but...
759 break; // bail out
761 // Check the type of the exception against the catch type
762 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
763 Node* con = _gvn.makecon(tk);
764 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
765 if (!stopped()) {
766 PreserveJVMState pjvms(this);
767 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
768 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
769 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
770 push_ex_oop(ex_oop); // Push exception oop for handler
771 #ifndef PRODUCT
772 if (PrintOpto && WizardMode) {
773 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
774 klass->print_name();
775 tty->cr();
776 }
777 #endif
778 merge_exception(handler_bci);
779 }
780 set_control(not_subtype_ctrl);
782 // Come here if exception does not match handler.
783 // Carry on with more handler checks.
784 --remaining;
785 }
787 assert(!stopped(), "you should return if you finish the chain");
789 // Oops, need to call into the VM to resolve the klasses at runtime.
790 // Note: This call must not deoptimize, since it is not a real at this bci!
791 kill_dead_locals();
793 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
794 OptoRuntime::rethrow_Type(),
795 OptoRuntime::rethrow_stub(),
796 NULL, NULL,
797 ex_node);
799 // Rethrow is a pure call, no side effects, only a result.
800 // The result cannot be allocated, so we use I_O
802 // Catch exceptions from the rethrow
803 catch_call_exceptions(handlers);
804 }
807 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
810 #ifndef PRODUCT
811 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
812 if( CountCompiledCalls ) {
813 if( at_method_entry ) {
814 // bump invocation counter if top method (for statistics)
815 if (CountCompiledCalls && depth() == 1) {
816 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
817 Node* adr1 = makecon(addr_type);
818 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
819 increment_counter(adr2);
820 }
821 } else if (is_inline) {
822 switch (bc()) {
823 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
824 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
825 case Bytecodes::_invokestatic:
826 case Bytecodes::_invokedynamic:
827 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
828 default: fatal("unexpected call bytecode");
829 }
830 } else {
831 switch (bc()) {
832 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
833 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
834 case Bytecodes::_invokestatic:
835 case Bytecodes::_invokedynamic:
836 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
837 default: fatal("unexpected call bytecode");
838 }
839 }
840 }
841 }
842 #endif //PRODUCT
845 // Identify possible target method and inlining style
846 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
847 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
848 // only use for virtual or interface calls
850 // If it is obviously final, do not bother to call find_monomorphic_target,
851 // because the class hierarchy checks are not needed, and may fail due to
852 // incompletely loaded classes. Since we do our own class loading checks
853 // in this module, we may confidently bind to any method.
854 if (dest_method->can_be_statically_bound()) {
855 return dest_method;
856 }
858 // Attempt to improve the receiver
859 bool actual_receiver_is_exact = false;
860 ciInstanceKlass* actual_receiver = klass;
861 if (receiver_type != NULL) {
862 // Array methods are all inherited from Object, and are monomorphic.
863 if (receiver_type->isa_aryptr() &&
864 dest_method->holder() == env()->Object_klass()) {
865 return dest_method;
866 }
868 // All other interesting cases are instance klasses.
869 if (!receiver_type->isa_instptr()) {
870 return NULL;
871 }
873 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
874 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
875 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
876 // ikl is a same or better type than the original actual_receiver,
877 // e.g. static receiver from bytecodes.
878 actual_receiver = ikl;
879 // Is the actual_receiver exact?
880 actual_receiver_is_exact = receiver_type->klass_is_exact();
881 }
882 }
884 ciInstanceKlass* calling_klass = caller->holder();
885 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
886 if (cha_monomorphic_target != NULL) {
887 assert(!cha_monomorphic_target->is_abstract(), "");
888 // Look at the method-receiver type. Does it add "too much information"?
889 ciKlass* mr_klass = cha_monomorphic_target->holder();
890 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
891 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
892 // Calling this method would include an implicit cast to its holder.
893 // %%% Not yet implemented. Would throw minor asserts at present.
894 // %%% The most common wins are already gained by +UseUniqueSubclasses.
895 // To fix, put the higher_equal check at the call of this routine,
896 // and add a CheckCastPP to the receiver.
897 if (TraceDependencies) {
898 tty->print_cr("found unique CHA method, but could not cast up");
899 tty->print(" method = ");
900 cha_monomorphic_target->print();
901 tty->cr();
902 }
903 if (C->log() != NULL) {
904 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
905 C->log()->identify(klass),
906 C->log()->identify(cha_monomorphic_target));
907 }
908 cha_monomorphic_target = NULL;
909 }
910 }
911 if (cha_monomorphic_target != NULL) {
912 // Hardwiring a virtual.
913 // If we inlined because CHA revealed only a single target method,
914 // then we are dependent on that target method not getting overridden
915 // by dynamic class loading. Be sure to test the "static" receiver
916 // dest_method here, as opposed to the actual receiver, which may
917 // falsely lead us to believe that the receiver is final or private.
918 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
919 return cha_monomorphic_target;
920 }
922 // If the type is exact, we can still bind the method w/o a vcall.
923 // (This case comes after CHA so we can see how much extra work it does.)
924 if (actual_receiver_is_exact) {
925 // In case of evolution, there is a dependence on every inlined method, since each
926 // such method can be changed when its class is redefined.
927 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
928 if (exact_method != NULL) {
929 #ifndef PRODUCT
930 if (PrintOpto) {
931 tty->print(" Calling method via exact type @%d --- ", bci);
932 exact_method->print_name();
933 tty->cr();
934 }
935 #endif
936 return exact_method;
937 }
938 }
940 return NULL;
941 }