1 /*
2 * Copyright 1998-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_doCall.cpp.incl"
27
28 #ifndef PRODUCT
29 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
30 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) {
31 tty->print(" ");
32 for( int i = 0; i < depth; i++ ) tty->print(" ");
33 if (!PrintOpto) {
34 method->print_short_name();
35 tty->print(" ->");
36 }
37 tty->print(" @ %d ", bci);
38 prof_method->print_short_name();
39 tty->print(" >>TypeProfile (%d/%d counts) = ", receiver_count, site_count);
40 prof_klass->name()->print_symbol();
41 tty->print_cr(" (%d bytes)", prof_method->code_size());
42 }
43 }
44 #endif
45
46 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual, JVMState* jvms, bool allow_inline, float prof_factor) {
47 CallGenerator* cg;
48
49 // Dtrace currently doesn't work unless all calls are vanilla
50 if (env()->dtrace_method_probes()) {
51 allow_inline = false;
52 }
53
54 // Note: When we get profiling during stage-1 compiles, we want to pull
55 // from more specific profile data which pertains to this inlining.
56 // Right now, ignore the information in jvms->caller(), and do method[bci].
57 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci());
58
59 // See how many times this site has been invoked.
60 int site_count = profile.count();
61 int receiver_count = -1;
62 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
63 // Receivers in the profile structure are ordered by call counts
64 // so that the most called (major) receiver is profile.receiver(0).
65 receiver_count = profile.receiver_count(0);
66 }
67
68 CompileLog* log = this->log();
69 if (log != NULL) {
70 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
71 int r2id = (profile.morphism() == 2)? log->identify(profile.receiver(1)):-1;
72 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
73 log->identify(call_method), site_count, prof_factor);
74 if (call_is_virtual) log->print(" virtual='1'");
75 if (allow_inline) log->print(" inline='1'");
76 if (receiver_count >= 0) {
77 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
78 if (profile.has_receiver(1)) {
79 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
80 }
81 }
82 log->end_elem();
83 }
84
85 // Special case the handling of certain common, profitable library
86 // methods. If these methods are replaced with specialized code,
87 // then we return it as the inlined version of the call.
88 // We do this before the strict f.p. check below because the
89 // intrinsics handle strict f.p. correctly.
90 if (allow_inline) {
91 cg = find_intrinsic(call_method, call_is_virtual);
92 if (cg != NULL) return cg;
93 }
94
95 // Do not inline strict fp into non-strict code, or the reverse
96 bool caller_method_is_strict = jvms->method()->is_strict();
97 if( caller_method_is_strict ^ call_method->is_strict() ) {
98 allow_inline = false;
99 }
100
101 // Attempt to inline...
102 if (allow_inline) {
103 // The profile data is only partly attributable to this caller,
104 // scale back the call site information.
105 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
106 // This is the number of times we expect the call code to be used.
107 float expected_uses = past_uses;
108
109 // Try inlining a bytecoded method:
110 if (!call_is_virtual) {
111 InlineTree* ilt;
112 if (UseOldInlining) {
113 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
114 } else {
115 // Make a disembodied, stateless ILT.
116 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
117 float site_invoke_ratio = prof_factor;
118 // Note: ilt is for the root of this parse, not the present call site.
119 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio);
120 }
121 WarmCallInfo scratch_ci;
122 if (!UseOldInlining)
123 scratch_ci.init(jvms, call_method, profile, prof_factor);
124 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
125 assert(ci != &scratch_ci, "do not let this pointer escape");
126 bool allow_inline = (ci != NULL && !ci->is_cold());
127 bool require_inline = (allow_inline && ci->is_hot());
128
129 if (allow_inline) {
130 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
131 if (cg == NULL) {
132 // Fall through.
133 } else if (require_inline || !InlineWarmCalls) {
134 return cg;
135 } else {
136 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
137 return CallGenerator::for_warm_call(ci, cold_cg, cg);
138 }
139 }
140 }
141
142 // Try using the type profile.
143 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
144 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
145 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
146 ciMethod* receiver_method = NULL;
147 if (have_major_receiver || profile.morphism() == 1 ||
148 (profile.morphism() == 2 && UseBimorphicInlining)) {
149 // receiver_method = profile.method();
150 // Profiles do not suggest methods now. Look it up in the major receiver.
151 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
152 profile.receiver(0));
153 }
154 if (receiver_method != NULL) {
155 // The single majority receiver sufficiently outweighs the minority.
156 CallGenerator* hit_cg = this->call_generator(receiver_method,
157 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
158 if (hit_cg != NULL) {
159 // Look up second receiver.
160 CallGenerator* next_hit_cg = NULL;
161 ciMethod* next_receiver_method = NULL;
162 if (profile.morphism() == 2 && UseBimorphicInlining) {
163 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
164 profile.receiver(1));
165 if (next_receiver_method != NULL) {
166 next_hit_cg = this->call_generator(next_receiver_method,
167 vtable_index, !call_is_virtual, jvms,
168 allow_inline, prof_factor);
169 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
170 have_major_receiver && UseOnlyInlinedBimorphic) {
171 // Skip if we can't inline second receiver's method
172 next_hit_cg = NULL;
173 }
174 }
175 }
176 CallGenerator* miss_cg;
177 if (( profile.morphism() == 1 ||
178 (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
179
180 !too_many_traps(Deoptimization::Reason_class_check)
181
182 // Check only total number of traps per method to allow
183 // the transition from monomorphic to bimorphic case between
184 // compilations without falling into virtual call.
185 // A monomorphic case may have the class_check trap flag is set
186 // due to the time gap between the uncommon trap processing
187 // when flags are set in MDO and the call site bytecode execution
188 // in Interpreter when MDO counters are updated.
189 // There was also class_check trap in monomorphic case due to
190 // the bug 6225440.
191
192 ) {
193 // Generate uncommon trap for class check failure path
194 // in case of monomorphic or bimorphic virtual call site.
195 miss_cg = CallGenerator::for_uncommon_trap(call_method,
196 Deoptimization::Reason_class_check,
197 Deoptimization::Action_maybe_recompile);
198 } else {
199 // Generate virtual call for class check failure path
200 // in case of polymorphic virtual call site.
201 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
202 }
203 if (miss_cg != NULL) {
204 if (next_hit_cg != NULL) {
205 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
206 // We don't need to record dependency on a receiver here and below.
207 // Whenever we inline, the dependency is added by Parse::Parse().
208 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
209 }
210 if (miss_cg != NULL) {
211 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
212 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
213 if (cg != NULL) return cg;
214 }
215 }
216 }
217 }
218 }
219 }
220
221 // There was no special inlining tactic, or it bailed out.
222 // Use a more generic tactic, like a simple call.
223 if (call_is_virtual) {
224 return CallGenerator::for_virtual_call(call_method, vtable_index);
225 } else {
226 // Class Hierarchy Analysis or Type Profile reveals a unique target,
227 // or it is a static or special call.
228 return CallGenerator::for_direct_call(call_method);
229 }
230 }
231
232
233 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
234 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
235 // Additional inputs to consider...
236 // bc = bc()
237 // caller = method()
238 // iter().get_method_holder_index()
239 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
240 // Interface classes can be loaded & linked and never get around to
241 // being initialized. Uncommon-trap for not-initialized static or
242 // v-calls. Let interface calls happen.
243 ciInstanceKlass* holder_klass = dest_method->holder();
244 if (!holder_klass->is_initialized() &&
245 !holder_klass->is_interface()) {
246 uncommon_trap(Deoptimization::Reason_uninitialized,
247 Deoptimization::Action_reinterpret,
248 holder_klass);
249 return true;
250 }
251 if (dest_method->is_method_handle_invoke()
252 && holder_klass->name() == ciSymbol::java_dyn_InvokeDynamic()) {
253 // FIXME: NYI
254 uncommon_trap(Deoptimization::Reason_unhandled,
255 Deoptimization::Action_none,
256 holder_klass);
257 return true;
258 }
259
260 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
261 return false;
262 }
263
264
265 //------------------------------do_call----------------------------------------
266 // Handle your basic call. Inline if we can & want to, else just setup call.
267 void Parse::do_call() {
268 // It's likely we are going to add debug info soon.
269 // Also, if we inline a guy who eventually needs debug info for this JVMS,
270 // our contribution to it is cleaned up right here.
271 kill_dead_locals();
272
273 // Set frequently used booleans
274 bool is_virtual = bc() == Bytecodes::_invokevirtual;
275 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
276 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
277
278 // Find target being called
279 bool will_link;
280 ciMethod* dest_method = iter().get_method(will_link);
281 ciInstanceKlass* holder_klass = dest_method->holder();
282 ciKlass* holder = iter().get_declared_method_holder();
283 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
284
285 int nargs = dest_method->arg_size();
286
287 // uncommon-trap when callee is unloaded, uninitialized or will not link
288 // bailout when too many arguments for register representation
289 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
290 #ifndef PRODUCT
291 if (PrintOpto && (Verbose || WizardMode)) {
292 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
293 dest_method->print_name(); tty->cr();
294 }
295 #endif
296 return;
297 }
298 assert(holder_klass->is_loaded(), "");
299 assert(dest_method->is_static() == !has_receiver, "must match bc");
300 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
301 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
302 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
303 // Note: In the absence of miranda methods, an abstract class K can perform
304 // an invokevirtual directly on an interface method I.m if K implements I.
305
306 // ---------------------
307 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
308 // Then we may inline or make a static call, but become dependent on there being only 1 target.
309 // Does the call-site type profile reveal only one receiver?
310 // Then we may introduce a run-time check and inline on the path where it succeeds.
311 // The other path may uncommon_trap, check for another receiver, or do a v-call.
312
313 // Choose call strategy.
314 bool call_is_virtual = is_virtual_or_interface;
315 int vtable_index = methodOopDesc::invalid_vtable_index;
316 ciMethod* call_method = dest_method;
317
318 // Try to get the most accurate receiver type
319 if (is_virtual_or_interface) {
320 Node* receiver_node = stack(sp() - nargs);
321 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
322 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
323
324 // Have the call been sufficiently improved such that it is no longer a virtual?
325 if (optimized_virtual_method != NULL) {
326 call_method = optimized_virtual_method;
327 call_is_virtual = false;
328 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
329 // We can make a vtable call at this site
330 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
331 }
332 }
333
334 // Note: It's OK to try to inline a virtual call.
335 // The call generator will not attempt to inline a polymorphic call
336 // unless it knows how to optimize the receiver dispatch.
337 bool try_inline = (C->do_inlining() || InlineAccessors);
338
339 // ---------------------
340 inc_sp(- nargs); // Temporarily pop args for JVM state of call
341 JVMState* jvms = sync_jvms();
342
343 // ---------------------
344 // Decide call tactic.
345 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
346 // It decides whether inlining is desirable or not.
347 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
348
349 // ---------------------
350 // Round double arguments before call
351 round_double_arguments(dest_method);
352
353 #ifndef PRODUCT
354 // bump global counters for calls
355 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
356
357 // Record first part of parsing work for this call
358 parse_histogram()->record_change();
359 #endif // not PRODUCT
360
361 assert(jvms == this->jvms(), "still operating on the right JVMS");
362 assert(jvms_in_sync(), "jvms must carry full info into CG");
363
364 // save across call, for a subsequent cast_not_null.
365 Node* receiver = has_receiver ? argument(0) : NULL;
366
367 // Bump method data counters (We profile *before* the call is made
368 // because exceptions don't return to the call site.)
369 profile_call(receiver);
370
371 JVMState* new_jvms;
372 if ((new_jvms = cg->generate(jvms)) == NULL) {
373 // When inlining attempt fails (e.g., too many arguments),
374 // it may contaminate the current compile state, making it
375 // impossible to pull back and try again. Once we call
376 // cg->generate(), we are committed. If it fails, the whole
377 // compilation task is compromised.
378 if (failing()) return;
379 #ifndef PRODUCT
380 if (PrintOpto || PrintOptoInlining || PrintInlining) {
381 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
382 if (cg->is_intrinsic() && call_method->code_size() > 0) {
383 tty->print("Bailed out of intrinsic, will not inline: ");
384 call_method->print_name(); tty->cr();
385 }
386 }
387 #endif
388 // This can happen if a library intrinsic is available, but refuses
389 // the call site, perhaps because it did not match a pattern the
390 // intrinsic was expecting to optimize. The fallback position is
391 // to call out-of-line.
392 try_inline = false; // Inline tactic bailed out.
393 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
394 if ((new_jvms = cg->generate(jvms)) == NULL) {
395 guarantee(failing(), "call failed to generate: calls should work");
396 return;
397 }
398 }
399
400 if (cg->is_inline()) {
401 // Accumulate has_loops estimate
402 C->set_has_loops(C->has_loops() || call_method->has_loops());
403 C->env()->notice_inlined_method(call_method);
404 }
405
406 // Reset parser state from [new_]jvms, which now carries results of the call.
407 // Return value (if any) is already pushed on the stack by the cg.
408 add_exception_states_from(new_jvms);
409 if (new_jvms->map()->control() == top()) {
410 stop_and_kill_map();
411 } else {
412 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
413 set_jvms(new_jvms);
414 }
415
416 if (!stopped()) {
417 // This was some sort of virtual call, which did a null check for us.
418 // Now we can assert receiver-not-null, on the normal return path.
419 if (receiver != NULL && cg->is_virtual()) {
420 Node* cast = cast_not_null(receiver);
421 // %%% assert(receiver == cast, "should already have cast the receiver");
422 }
423
424 // Round double result after a call from strict to non-strict code
425 round_double_result(dest_method);
426
427 // If the return type of the method is not loaded, assert that the
428 // value we got is a null. Otherwise, we need to recompile.
429 if (!dest_method->return_type()->is_loaded()) {
430 #ifndef PRODUCT
431 if (PrintOpto && (Verbose || WizardMode)) {
432 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
433 dest_method->print_name(); tty->cr();
434 }
435 #endif
436 if (C->log() != NULL) {
437 C->log()->elem("assert_null reason='return' klass='%d'",
438 C->log()->identify(dest_method->return_type()));
439 }
440 // If there is going to be a trap, put it at the next bytecode:
441 set_bci(iter().next_bci());
442 do_null_assert(peek(), T_OBJECT);
443 set_bci(iter().cur_bci()); // put it back
444 }
445 }
446
447 // Restart record of parsing work after possible inlining of call
448 #ifndef PRODUCT
449 parse_histogram()->set_initial_state(bc());
450 #endif
451 }
452
453 //---------------------------catch_call_exceptions-----------------------------
454 // Put a Catch and CatchProj nodes behind a just-created call.
455 // Send their caught exceptions to the proper handler.
456 // This may be used after a call to the rethrow VM stub,
457 // when it is needed to process unloaded exception classes.
458 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
459 // Exceptions are delivered through this channel:
460 Node* i_o = this->i_o();
461
462 // Add a CatchNode.
463 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
464 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
465 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
466
467 for (; !handlers.is_done(); handlers.next()) {
468 ciExceptionHandler* h = handlers.handler();
469 int h_bci = h->handler_bci();
470 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
471 // Do not introduce unloaded exception types into the graph:
472 if (!h_klass->is_loaded()) {
473 if (saw_unloaded->contains(h_bci)) {
474 /* We've already seen an unloaded exception with h_bci,
475 so don't duplicate. Duplication will cause the CatchNode to be
476 unnecessarily large. See 4713716. */
477 continue;
478 } else {
479 saw_unloaded->append(h_bci);
480 }
481 }
482 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
483 // (We use make_from_klass because it respects UseUniqueSubclasses.)
484 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
485 assert(!h_extype->empty(), "sanity");
486 // Note: It's OK if the BCIs repeat themselves.
487 bcis->append(h_bci);
488 extypes->append(h_extype);
489 }
490
491 int len = bcis->length();
492 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
493 Node *catch_ = _gvn.transform(cn);
494
495 // now branch with the exception state to each of the (potential)
496 // handlers
497 for(int i=0; i < len; i++) {
498 // Setup JVM state to enter the handler.
499 PreserveJVMState pjvms(this);
500 // Locals are just copied from before the call.
501 // Get control from the CatchNode.
502 int handler_bci = bcis->at(i);
503 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
504 // This handler cannot happen?
505 if (ctrl == top()) continue;
506 set_control(ctrl);
507
508 // Create exception oop
509 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
510 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
511
512 // Handle unloaded exception classes.
513 if (saw_unloaded->contains(handler_bci)) {
514 // An unloaded exception type is coming here. Do an uncommon trap.
515 #ifndef PRODUCT
516 // We do not expect the same handler bci to take both cold unloaded
517 // and hot loaded exceptions. But, watch for it.
518 if (extype->is_loaded()) {
519 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
520 method()->print_name(); tty->cr();
521 } else if (PrintOpto && (Verbose || WizardMode)) {
522 tty->print("Bailing out on unloaded exception type ");
523 extype->klass()->print_name();
524 tty->print(" at bci:%d in ", bci());
525 method()->print_name(); tty->cr();
526 }
527 #endif
528 // Emit an uncommon trap instead of processing the block.
529 set_bci(handler_bci);
530 push_ex_oop(ex_oop);
531 uncommon_trap(Deoptimization::Reason_unloaded,
532 Deoptimization::Action_reinterpret,
533 extype->klass(), "!loaded exception");
534 set_bci(iter().cur_bci()); // put it back
535 continue;
536 }
537
538 // go to the exception handler
539 if (handler_bci < 0) { // merge with corresponding rethrow node
540 throw_to_exit(make_exception_state(ex_oop));
541 } else { // Else jump to corresponding handle
542 push_ex_oop(ex_oop); // Clear stack and push just the oop.
543 merge_exception(handler_bci);
544 }
545 }
546
547 // The first CatchProj is for the normal return.
548 // (Note: If this is a call to rethrow_Java, this node goes dead.)
549 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
550 }
551
552
553 //----------------------------catch_inline_exceptions--------------------------
554 // Handle all exceptions thrown by an inlined method or individual bytecode.
555 // Common case 1: we have no handler, so all exceptions merge right into
556 // the rethrow case.
557 // Case 2: we have some handlers, with loaded exception klasses that have
558 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
559 // exception oop and branch to the handler directly.
560 // Case 3: We have some handlers with subklasses or are not loaded at
561 // compile-time. We have to call the runtime to resolve the exception.
562 // So we insert a RethrowCall and all the logic that goes with it.
563 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
564 // Caller is responsible for saving away the map for normal control flow!
565 assert(stopped(), "call set_map(NULL) first");
566 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
567
568 Node* ex_node = saved_ex_oop(ex_map);
569 if (ex_node == top()) {
570 // No action needed.
571 return;
572 }
573 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
574 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
575 if (ex_type == NULL)
576 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
577
578 // determine potential exception handlers
579 ciExceptionHandlerStream handlers(method(), bci(),
580 ex_type->klass()->as_instance_klass(),
581 ex_type->klass_is_exact());
582
583 // Start executing from the given throw state. (Keep its stack, for now.)
584 // Get the exception oop as known at compile time.
585 ex_node = use_exception_state(ex_map);
586
587 // Get the exception oop klass from its header
588 Node* ex_klass_node = NULL;
589 if (has_ex_handler() && !ex_type->klass_is_exact()) {
590 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
591 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
592
593 // Compute the exception klass a little more cleverly.
594 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
595 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
596 // each arm of the Phi. If I know something clever about the exceptions
597 // I'm loading the class from, I can replace the LoadKlass with the
598 // klass constant for the exception oop.
599 if( ex_node->is_Phi() ) {
600 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
601 for( uint i = 1; i < ex_node->req(); i++ ) {
602 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
603 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
604 ex_klass_node->init_req( i, k );
605 }
606 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
607
608 }
609 }
610
611 // Scan the exception table for applicable handlers.
612 // If none, we can call rethrow() and be done!
613 // If precise (loaded with no subklasses), insert a D.S. style
614 // pointer compare to the correct handler and loop back.
615 // If imprecise, switch to the Rethrow VM-call style handling.
616
617 int remaining = handlers.count_remaining();
618
619 // iterate through all entries sequentially
620 for (;!handlers.is_done(); handlers.next()) {
621 // Do nothing if turned off
622 if( !DeutschShiffmanExceptions ) break;
623 ciExceptionHandler* handler = handlers.handler();
624
625 if (handler->is_rethrow()) {
626 // If we fell off the end of the table without finding an imprecise
627 // exception klass (and without finding a generic handler) then we
628 // know this exception is not handled in this method. We just rethrow
629 // the exception into the caller.
630 throw_to_exit(make_exception_state(ex_node));
631 return;
632 }
633
634 // exception handler bci range covers throw_bci => investigate further
635 int handler_bci = handler->handler_bci();
636
637 if (remaining == 1) {
638 push_ex_oop(ex_node); // Push exception oop for handler
639 #ifndef PRODUCT
640 if (PrintOpto && WizardMode) {
641 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
642 }
643 #endif
644 merge_exception(handler_bci); // jump to handler
645 return; // No more handling to be done here!
646 }
647
648 // %%% The following logic replicates make_from_klass_unique.
649 // TO DO: Replace by a subroutine call. Then generalize
650 // the type check, as noted in the next "%%%" comment.
651
652 ciInstanceKlass* klass = handler->catch_klass();
653 if (UseUniqueSubclasses) {
654 // (We use make_from_klass because it respects UseUniqueSubclasses.)
655 const TypeOopPtr* tp = TypeOopPtr::make_from_klass(klass);
656 klass = tp->klass()->as_instance_klass();
657 }
658
659 // Get the handler's klass
660 if (!klass->is_loaded()) // klass is not loaded?
661 break; // Must call Rethrow!
662 if (klass->is_interface()) // should not happen, but...
663 break; // bail out
664 // See if the loaded exception klass has no subtypes
665 if (klass->has_subklass())
666 break; // Cannot easily do precise test ==> Rethrow
667
668 // %%% Now that subclass checking is very fast, we need to rewrite
669 // this section and remove the option "DeutschShiffmanExceptions".
670 // The exception processing chain should be a normal typecase pattern,
671 // with a bailout to the interpreter only in the case of unloaded
672 // classes. (The bailout should mark the method non-entrant.)
673 // This rewrite should be placed in GraphKit::, not Parse::.
674
675 // Add a dependence; if any subclass added we need to recompile
676 // %%% should use stronger assert_unique_concrete_subtype instead
677 if (!klass->is_final()) {
678 C->dependencies()->assert_leaf_type(klass);
679 }
680
681 // Implement precise test
682 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
683 Node* con = _gvn.makecon(tk);
684 Node* cmp = _gvn.transform( new (C, 3) CmpPNode(ex_klass_node, con) );
685 Node* bol = _gvn.transform( new (C, 2) BoolNode(cmp, BoolTest::ne) );
686 { BuildCutout unless(this, bol, PROB_LIKELY(0.7f));
687 const TypeInstPtr* tinst = TypeInstPtr::make_exact(TypePtr::NotNull, klass);
688 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
689 push_ex_oop(ex_oop); // Push exception oop for handler
690 #ifndef PRODUCT
691 if (PrintOpto && WizardMode) {
692 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
693 klass->print_name();
694 tty->cr();
695 }
696 #endif
697 merge_exception(handler_bci);
698 }
699
700 // Come here if exception does not match handler.
701 // Carry on with more handler checks.
702 --remaining;
703 }
704
705 assert(!stopped(), "you should return if you finish the chain");
706
707 if (remaining == 1) {
708 // Further checks do not matter.
709 }
710
711 if (can_rerun_bytecode()) {
712 // Do not push_ex_oop here!
713 // Re-executing the bytecode will reproduce the throwing condition.
714 bool must_throw = true;
715 uncommon_trap(Deoptimization::Reason_unhandled,
716 Deoptimization::Action_none,
717 (ciKlass*)NULL, (const char*)NULL, // default args
718 must_throw);
719 return;
720 }
721
722 // Oops, need to call into the VM to resolve the klasses at runtime.
723 // Note: This call must not deoptimize, since it is not a real at this bci!
724 kill_dead_locals();
725
726 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
727 OptoRuntime::rethrow_Type(),
728 OptoRuntime::rethrow_stub(),
729 NULL, NULL,
730 ex_node);
731
732 // Rethrow is a pure call, no side effects, only a result.
733 // The result cannot be allocated, so we use I_O
734
735 // Catch exceptions from the rethrow
736 catch_call_exceptions(handlers);
737 }
738
739
740 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
741
742
743 #ifndef PRODUCT
744 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
745 if( CountCompiledCalls ) {
746 if( at_method_entry ) {
747 // bump invocation counter if top method (for statistics)
748 if (CountCompiledCalls && depth() == 1) {
749 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
750 Node* adr1 = makecon(addr_type);
751 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
752 increment_counter(adr2);
753 }
754 } else if (is_inline) {
755 switch (bc()) {
756 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
757 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
758 case Bytecodes::_invokestatic:
759 case Bytecodes::_invokedynamic:
760 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
761 default: fatal("unexpected call bytecode");
762 }
763 } else {
764 switch (bc()) {
765 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
766 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
767 case Bytecodes::_invokestatic:
768 case Bytecodes::_invokedynamic:
769 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
770 default: fatal("unexpected call bytecode");
771 }
772 }
773 }
774 }
775 #endif //PRODUCT
776
777
778 // Identify possible target method and inlining style
779 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
780 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
781 // only use for virtual or interface calls
782
783 // If it is obviously final, do not bother to call find_monomorphic_target,
784 // because the class hierarchy checks are not needed, and may fail due to
785 // incompletely loaded classes. Since we do our own class loading checks
786 // in this module, we may confidently bind to any method.
787 if (dest_method->can_be_statically_bound()) {
788 return dest_method;
789 }
790
791 // Attempt to improve the receiver
792 bool actual_receiver_is_exact = false;
793 ciInstanceKlass* actual_receiver = klass;
794 if (receiver_type != NULL) {
795 // Array methods are all inherited from Object, and are monomorphic.
796 if (receiver_type->isa_aryptr() &&
797 dest_method->holder() == env()->Object_klass()) {
798 return dest_method;
799 }
800
801 // All other interesting cases are instance klasses.
802 if (!receiver_type->isa_instptr()) {
803 return NULL;
804 }
805
806 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
807 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
808 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
809 // ikl is a same or better type than the original actual_receiver,
810 // e.g. static receiver from bytecodes.
811 actual_receiver = ikl;
812 // Is the actual_receiver exact?
813 actual_receiver_is_exact = receiver_type->klass_is_exact();
814 }
815 }
816
817 ciInstanceKlass* calling_klass = caller->holder();
818 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
819 if (cha_monomorphic_target != NULL) {
820 assert(!cha_monomorphic_target->is_abstract(), "");
821 // Look at the method-receiver type. Does it add "too much information"?
822 ciKlass* mr_klass = cha_monomorphic_target->holder();
823 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
824 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
825 // Calling this method would include an implicit cast to its holder.
826 // %%% Not yet implemented. Would throw minor asserts at present.
827 // %%% The most common wins are already gained by +UseUniqueSubclasses.
828 // To fix, put the higher_equal check at the call of this routine,
829 // and add a CheckCastPP to the receiver.
830 if (TraceDependencies) {
831 tty->print_cr("found unique CHA method, but could not cast up");
832 tty->print(" method = ");
833 cha_monomorphic_target->print();
834 tty->cr();
835 }
836 if (C->log() != NULL) {
837 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
838 C->log()->identify(klass),
839 C->log()->identify(cha_monomorphic_target));
840 }
841 cha_monomorphic_target = NULL;
842 }
843 }
844 if (cha_monomorphic_target != NULL) {
845 // Hardwiring a virtual.
846 // If we inlined because CHA revealed only a single target method,
847 // then we are dependent on that target method not getting overridden
848 // by dynamic class loading. Be sure to test the "static" receiver
849 // dest_method here, as opposed to the actual receiver, which may
850 // falsely lead us to believe that the receiver is final or private.
851 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
852 return cha_monomorphic_target;
853 }
854
855 // If the type is exact, we can still bind the method w/o a vcall.
856 // (This case comes after CHA so we can see how much extra work it does.)
857 if (actual_receiver_is_exact) {
858 // In case of evolution, there is a dependence on every inlined method, since each
859 // such method can be changed when its class is redefined.
860 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
861 if (exact_method != NULL) {
862 #ifndef PRODUCT
863 if (PrintOpto) {
864 tty->print(" Calling method via exact type @%d --- ", bci);
865 exact_method->print_name();
866 tty->cr();
867 }
868 #endif
869 return exact_method;
870 }
871 }
872
873 return NULL;
874 }