Thu, 21 Jul 2011 11:25:07 -0700
7063628: Use cbcond on T4
Summary: Add new short branch instruction to Hotspot sparc assembler.
Reviewed-by: never, twisti, jrose
1 /*
2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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 MethodHandle 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 }
131 return CallGenerator::for_direct_call(call_method);
132 }
133 else {
134 // Get the MethodHandle from the CallSite.
135 ciMethod* caller_method = jvms->method();
136 ciBytecodeStream str(caller_method);
137 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci.
138 ciCallSite* call_site = str.get_call_site();
139 ciMethodHandle* method_handle = call_site->get_target();
141 // Set the callee to have access to the class and signature in
142 // the MethodHandleCompiler.
143 method_handle->set_callee(call_method);
144 method_handle->set_caller(caller);
145 method_handle->set_call_profile(profile);
147 // Get an adapter for the MethodHandle.
148 ciMethod* target_method = method_handle->get_invokedynamic_adapter();
149 if (target_method != NULL) {
150 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
151 if (hit_cg != NULL && hit_cg->is_inline()) {
152 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method);
153 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor);
154 }
155 }
157 // If something failed, generate a normal dynamic call.
158 return CallGenerator::for_dynamic_call(call_method);
159 }
160 }
162 // Do not inline strict fp into non-strict code, or the reverse
163 bool caller_method_is_strict = jvms->method()->is_strict();
164 if( caller_method_is_strict ^ call_method->is_strict() ) {
165 allow_inline = false;
166 }
168 // Attempt to inline...
169 if (allow_inline) {
170 // The profile data is only partly attributable to this caller,
171 // scale back the call site information.
172 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
173 // This is the number of times we expect the call code to be used.
174 float expected_uses = past_uses;
176 // Try inlining a bytecoded method:
177 if (!call_is_virtual) {
178 InlineTree* ilt;
179 if (UseOldInlining) {
180 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
181 } else {
182 // Make a disembodied, stateless ILT.
183 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
184 float site_invoke_ratio = prof_factor;
185 // Note: ilt is for the root of this parse, not the present call site.
186 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel);
187 }
188 WarmCallInfo scratch_ci;
189 if (!UseOldInlining)
190 scratch_ci.init(jvms, call_method, profile, prof_factor);
191 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
192 assert(ci != &scratch_ci, "do not let this pointer escape");
193 bool allow_inline = (ci != NULL && !ci->is_cold());
194 bool require_inline = (allow_inline && ci->is_hot());
196 if (allow_inline) {
197 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
198 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) {
199 // Delay the inlining of this method to give us the
200 // opportunity to perform some high level optimizations
201 // first.
202 return CallGenerator::for_late_inline(call_method, cg);
203 }
204 if (cg == NULL) {
205 // Fall through.
206 } else if (require_inline || !InlineWarmCalls) {
207 return cg;
208 } else {
209 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
210 return CallGenerator::for_warm_call(ci, cold_cg, cg);
211 }
212 }
213 }
215 // Try using the type profile.
216 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
217 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
218 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
219 ciMethod* receiver_method = NULL;
220 if (have_major_receiver || profile.morphism() == 1 ||
221 (profile.morphism() == 2 && UseBimorphicInlining)) {
222 // receiver_method = profile.method();
223 // Profiles do not suggest methods now. Look it up in the major receiver.
224 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
225 profile.receiver(0));
226 }
227 if (receiver_method != NULL) {
228 // The single majority receiver sufficiently outweighs the minority.
229 CallGenerator* hit_cg = this->call_generator(receiver_method,
230 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
231 if (hit_cg != NULL) {
232 // Look up second receiver.
233 CallGenerator* next_hit_cg = NULL;
234 ciMethod* next_receiver_method = NULL;
235 if (profile.morphism() == 2 && UseBimorphicInlining) {
236 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
237 profile.receiver(1));
238 if (next_receiver_method != NULL) {
239 next_hit_cg = this->call_generator(next_receiver_method,
240 vtable_index, !call_is_virtual, jvms,
241 allow_inline, prof_factor);
242 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
243 have_major_receiver && UseOnlyInlinedBimorphic) {
244 // Skip if we can't inline second receiver's method
245 next_hit_cg = NULL;
246 }
247 }
248 }
249 CallGenerator* miss_cg;
250 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
251 Deoptimization::Reason_bimorphic :
252 Deoptimization::Reason_class_check;
253 if (( profile.morphism() == 1 ||
254 (profile.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(call_method, 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(call_method, vtable_index);
265 }
266 if (miss_cg != NULL) {
267 if (next_hit_cg != NULL) {
268 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
269 // We don't need to record dependency on a receiver here and below.
270 // Whenever we inline, the dependency is added by Parse::Parse().
271 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
272 }
273 if (miss_cg != NULL) {
274 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
275 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
276 if (cg != NULL) return cg;
277 }
278 }
279 }
280 }
281 }
282 }
284 // There was no special inlining tactic, or it bailed out.
285 // Use a more generic tactic, like a simple call.
286 if (call_is_virtual) {
287 return CallGenerator::for_virtual_call(call_method, vtable_index);
288 } else {
289 // Class Hierarchy Analysis or Type Profile reveals a unique target,
290 // or it is a static or special call.
291 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms));
292 }
293 }
295 // Return true for methods that shouldn't be inlined early so that
296 // they are easier to analyze and optimize as intrinsics.
297 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
298 if (has_stringbuilder()) {
300 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
301 call_method->holder() == C->env()->StringBuffer_klass()) &&
302 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
303 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
304 // Delay SB calls only when called from non-SB code
305 return false;
306 }
308 switch (call_method->intrinsic_id()) {
309 case vmIntrinsics::_StringBuilder_void:
310 case vmIntrinsics::_StringBuilder_int:
311 case vmIntrinsics::_StringBuilder_String:
312 case vmIntrinsics::_StringBuilder_append_char:
313 case vmIntrinsics::_StringBuilder_append_int:
314 case vmIntrinsics::_StringBuilder_append_String:
315 case vmIntrinsics::_StringBuilder_toString:
316 case vmIntrinsics::_StringBuffer_void:
317 case vmIntrinsics::_StringBuffer_int:
318 case vmIntrinsics::_StringBuffer_String:
319 case vmIntrinsics::_StringBuffer_append_char:
320 case vmIntrinsics::_StringBuffer_append_int:
321 case vmIntrinsics::_StringBuffer_append_String:
322 case vmIntrinsics::_StringBuffer_toString:
323 case vmIntrinsics::_Integer_toString:
324 return true;
326 case vmIntrinsics::_String_String:
327 {
328 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
329 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
330 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
331 ciMethod* m = csj->method();
332 if (m != NULL &&
333 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
334 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
335 // Delay String.<init>(new SB())
336 return true;
337 }
338 return false;
339 }
341 default:
342 return false;
343 }
344 }
345 return false;
346 }
349 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
350 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
351 // Additional inputs to consider...
352 // bc = bc()
353 // caller = method()
354 // iter().get_method_holder_index()
355 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
356 // Interface classes can be loaded & linked and never get around to
357 // being initialized. Uncommon-trap for not-initialized static or
358 // v-calls. Let interface calls happen.
359 ciInstanceKlass* holder_klass = dest_method->holder();
360 if (!holder_klass->is_being_initialized() &&
361 !holder_klass->is_initialized() &&
362 !holder_klass->is_interface()) {
363 uncommon_trap(Deoptimization::Reason_uninitialized,
364 Deoptimization::Action_reinterpret,
365 holder_klass);
366 return true;
367 }
369 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
370 return false;
371 }
374 //------------------------------do_call----------------------------------------
375 // Handle your basic call. Inline if we can & want to, else just setup call.
376 void Parse::do_call() {
377 // It's likely we are going to add debug info soon.
378 // Also, if we inline a guy who eventually needs debug info for this JVMS,
379 // our contribution to it is cleaned up right here.
380 kill_dead_locals();
382 // Set frequently used booleans
383 bool is_virtual = bc() == Bytecodes::_invokevirtual;
384 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
385 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
386 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic;
388 // Find target being called
389 bool will_link;
390 ciMethod* dest_method = iter().get_method(will_link);
391 ciInstanceKlass* holder_klass = dest_method->holder();
392 ciKlass* holder = iter().get_declared_method_holder();
393 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
395 int nargs = dest_method->arg_size();
396 if (is_invokedynamic) nargs -= 1;
398 // uncommon-trap when callee is unloaded, uninitialized or will not link
399 // bailout when too many arguments for register representation
400 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
401 #ifndef PRODUCT
402 if (PrintOpto && (Verbose || WizardMode)) {
403 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
404 dest_method->print_name(); tty->cr();
405 }
406 #endif
407 return;
408 }
409 assert(holder_klass->is_loaded(), "");
410 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc");
411 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
412 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
413 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
414 // Note: In the absence of miranda methods, an abstract class K can perform
415 // an invokevirtual directly on an interface method I.m if K implements I.
417 // ---------------------
418 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
419 // Then we may inline or make a static call, but become dependent on there being only 1 target.
420 // Does the call-site type profile reveal only one receiver?
421 // Then we may introduce a run-time check and inline on the path where it succeeds.
422 // The other path may uncommon_trap, check for another receiver, or do a v-call.
424 // Choose call strategy.
425 bool call_is_virtual = is_virtual_or_interface;
426 int vtable_index = methodOopDesc::invalid_vtable_index;
427 ciMethod* call_method = dest_method;
429 // Try to get the most accurate receiver type
430 if (is_virtual_or_interface) {
431 Node* receiver_node = stack(sp() - nargs);
432 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
433 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
435 // Have the call been sufficiently improved such that it is no longer a virtual?
436 if (optimized_virtual_method != NULL) {
437 call_method = optimized_virtual_method;
438 call_is_virtual = false;
439 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
440 // We can make a vtable call at this site
441 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
442 }
443 }
445 // Note: It's OK to try to inline a virtual call.
446 // The call generator will not attempt to inline a polymorphic call
447 // unless it knows how to optimize the receiver dispatch.
448 bool try_inline = (C->do_inlining() || InlineAccessors);
450 // ---------------------
451 inc_sp(- nargs); // Temporarily pop args for JVM state of call
452 JVMState* jvms = sync_jvms();
454 // ---------------------
455 // Decide call tactic.
456 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
457 // It decides whether inlining is desirable or not.
458 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
460 // ---------------------
461 // Round double arguments before call
462 round_double_arguments(dest_method);
464 #ifndef PRODUCT
465 // bump global counters for calls
466 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
468 // Record first part of parsing work for this call
469 parse_histogram()->record_change();
470 #endif // not PRODUCT
472 assert(jvms == this->jvms(), "still operating on the right JVMS");
473 assert(jvms_in_sync(), "jvms must carry full info into CG");
475 // save across call, for a subsequent cast_not_null.
476 Node* receiver = has_receiver ? argument(0) : NULL;
478 // Bump method data counters (We profile *before* the call is made
479 // because exceptions don't return to the call site.)
480 profile_call(receiver);
482 JVMState* new_jvms;
483 if ((new_jvms = cg->generate(jvms)) == NULL) {
484 // When inlining attempt fails (e.g., too many arguments),
485 // it may contaminate the current compile state, making it
486 // impossible to pull back and try again. Once we call
487 // cg->generate(), we are committed. If it fails, the whole
488 // compilation task is compromised.
489 if (failing()) return;
490 #ifndef PRODUCT
491 if (PrintOpto || PrintOptoInlining || PrintInlining) {
492 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
493 if (cg->is_intrinsic() && call_method->code_size() > 0) {
494 tty->print("Bailed out of intrinsic, will not inline: ");
495 call_method->print_name(); tty->cr();
496 }
497 }
498 #endif
499 // This can happen if a library intrinsic is available, but refuses
500 // the call site, perhaps because it did not match a pattern the
501 // intrinsic was expecting to optimize. The fallback position is
502 // to call out-of-line.
503 try_inline = false; // Inline tactic bailed out.
504 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
505 if ((new_jvms = cg->generate(jvms)) == NULL) {
506 guarantee(failing(), "call failed to generate: calls should work");
507 return;
508 }
509 }
511 if (cg->is_inline()) {
512 // Accumulate has_loops estimate
513 C->set_has_loops(C->has_loops() || call_method->has_loops());
514 C->env()->notice_inlined_method(call_method);
515 }
517 // Reset parser state from [new_]jvms, which now carries results of the call.
518 // Return value (if any) is already pushed on the stack by the cg.
519 add_exception_states_from(new_jvms);
520 if (new_jvms->map()->control() == top()) {
521 stop_and_kill_map();
522 } else {
523 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
524 set_jvms(new_jvms);
525 }
527 if (!stopped()) {
528 // This was some sort of virtual call, which did a null check for us.
529 // Now we can assert receiver-not-null, on the normal return path.
530 if (receiver != NULL && cg->is_virtual()) {
531 Node* cast = cast_not_null(receiver);
532 // %%% assert(receiver == cast, "should already have cast the receiver");
533 }
535 // Round double result after a call from strict to non-strict code
536 round_double_result(dest_method);
538 // If the return type of the method is not loaded, assert that the
539 // value we got is a null. Otherwise, we need to recompile.
540 if (!dest_method->return_type()->is_loaded()) {
541 #ifndef PRODUCT
542 if (PrintOpto && (Verbose || WizardMode)) {
543 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
544 dest_method->print_name(); tty->cr();
545 }
546 #endif
547 if (C->log() != NULL) {
548 C->log()->elem("assert_null reason='return' klass='%d'",
549 C->log()->identify(dest_method->return_type()));
550 }
551 // If there is going to be a trap, put it at the next bytecode:
552 set_bci(iter().next_bci());
553 do_null_assert(peek(), T_OBJECT);
554 set_bci(iter().cur_bci()); // put it back
555 }
556 }
558 // Restart record of parsing work after possible inlining of call
559 #ifndef PRODUCT
560 parse_histogram()->set_initial_state(bc());
561 #endif
562 }
564 //---------------------------catch_call_exceptions-----------------------------
565 // Put a Catch and CatchProj nodes behind a just-created call.
566 // Send their caught exceptions to the proper handler.
567 // This may be used after a call to the rethrow VM stub,
568 // when it is needed to process unloaded exception classes.
569 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
570 // Exceptions are delivered through this channel:
571 Node* i_o = this->i_o();
573 // Add a CatchNode.
574 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
575 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
576 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
578 for (; !handlers.is_done(); handlers.next()) {
579 ciExceptionHandler* h = handlers.handler();
580 int h_bci = h->handler_bci();
581 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
582 // Do not introduce unloaded exception types into the graph:
583 if (!h_klass->is_loaded()) {
584 if (saw_unloaded->contains(h_bci)) {
585 /* We've already seen an unloaded exception with h_bci,
586 so don't duplicate. Duplication will cause the CatchNode to be
587 unnecessarily large. See 4713716. */
588 continue;
589 } else {
590 saw_unloaded->append(h_bci);
591 }
592 }
593 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
594 // (We use make_from_klass because it respects UseUniqueSubclasses.)
595 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
596 assert(!h_extype->empty(), "sanity");
597 // Note: It's OK if the BCIs repeat themselves.
598 bcis->append(h_bci);
599 extypes->append(h_extype);
600 }
602 int len = bcis->length();
603 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
604 Node *catch_ = _gvn.transform(cn);
606 // now branch with the exception state to each of the (potential)
607 // handlers
608 for(int i=0; i < len; i++) {
609 // Setup JVM state to enter the handler.
610 PreserveJVMState pjvms(this);
611 // Locals are just copied from before the call.
612 // Get control from the CatchNode.
613 int handler_bci = bcis->at(i);
614 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
615 // This handler cannot happen?
616 if (ctrl == top()) continue;
617 set_control(ctrl);
619 // Create exception oop
620 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
621 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
623 // Handle unloaded exception classes.
624 if (saw_unloaded->contains(handler_bci)) {
625 // An unloaded exception type is coming here. Do an uncommon trap.
626 #ifndef PRODUCT
627 // We do not expect the same handler bci to take both cold unloaded
628 // and hot loaded exceptions. But, watch for it.
629 if (extype->is_loaded()) {
630 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
631 method()->print_name(); tty->cr();
632 } else if (PrintOpto && (Verbose || WizardMode)) {
633 tty->print("Bailing out on unloaded exception type ");
634 extype->klass()->print_name();
635 tty->print(" at bci:%d in ", bci());
636 method()->print_name(); tty->cr();
637 }
638 #endif
639 // Emit an uncommon trap instead of processing the block.
640 set_bci(handler_bci);
641 push_ex_oop(ex_oop);
642 uncommon_trap(Deoptimization::Reason_unloaded,
643 Deoptimization::Action_reinterpret,
644 extype->klass(), "!loaded exception");
645 set_bci(iter().cur_bci()); // put it back
646 continue;
647 }
649 // go to the exception handler
650 if (handler_bci < 0) { // merge with corresponding rethrow node
651 throw_to_exit(make_exception_state(ex_oop));
652 } else { // Else jump to corresponding handle
653 push_ex_oop(ex_oop); // Clear stack and push just the oop.
654 merge_exception(handler_bci);
655 }
656 }
658 // The first CatchProj is for the normal return.
659 // (Note: If this is a call to rethrow_Java, this node goes dead.)
660 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
661 }
664 //----------------------------catch_inline_exceptions--------------------------
665 // Handle all exceptions thrown by an inlined method or individual bytecode.
666 // Common case 1: we have no handler, so all exceptions merge right into
667 // the rethrow case.
668 // Case 2: we have some handlers, with loaded exception klasses that have
669 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
670 // exception oop and branch to the handler directly.
671 // Case 3: We have some handlers with subklasses or are not loaded at
672 // compile-time. We have to call the runtime to resolve the exception.
673 // So we insert a RethrowCall and all the logic that goes with it.
674 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
675 // Caller is responsible for saving away the map for normal control flow!
676 assert(stopped(), "call set_map(NULL) first");
677 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
679 Node* ex_node = saved_ex_oop(ex_map);
680 if (ex_node == top()) {
681 // No action needed.
682 return;
683 }
684 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
685 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
686 if (ex_type == NULL)
687 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
689 // determine potential exception handlers
690 ciExceptionHandlerStream handlers(method(), bci(),
691 ex_type->klass()->as_instance_klass(),
692 ex_type->klass_is_exact());
694 // Start executing from the given throw state. (Keep its stack, for now.)
695 // Get the exception oop as known at compile time.
696 ex_node = use_exception_state(ex_map);
698 // Get the exception oop klass from its header
699 Node* ex_klass_node = NULL;
700 if (has_ex_handler() && !ex_type->klass_is_exact()) {
701 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
702 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
704 // Compute the exception klass a little more cleverly.
705 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
706 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
707 // each arm of the Phi. If I know something clever about the exceptions
708 // I'm loading the class from, I can replace the LoadKlass with the
709 // klass constant for the exception oop.
710 if( ex_node->is_Phi() ) {
711 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
712 for( uint i = 1; i < ex_node->req(); i++ ) {
713 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
714 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
715 ex_klass_node->init_req( i, k );
716 }
717 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
719 }
720 }
722 // Scan the exception table for applicable handlers.
723 // If none, we can call rethrow() and be done!
724 // If precise (loaded with no subklasses), insert a D.S. style
725 // pointer compare to the correct handler and loop back.
726 // If imprecise, switch to the Rethrow VM-call style handling.
728 int remaining = handlers.count_remaining();
730 // iterate through all entries sequentially
731 for (;!handlers.is_done(); handlers.next()) {
732 ciExceptionHandler* handler = handlers.handler();
734 if (handler->is_rethrow()) {
735 // If we fell off the end of the table without finding an imprecise
736 // exception klass (and without finding a generic handler) then we
737 // know this exception is not handled in this method. We just rethrow
738 // the exception into the caller.
739 throw_to_exit(make_exception_state(ex_node));
740 return;
741 }
743 // exception handler bci range covers throw_bci => investigate further
744 int handler_bci = handler->handler_bci();
746 if (remaining == 1) {
747 push_ex_oop(ex_node); // Push exception oop for handler
748 #ifndef PRODUCT
749 if (PrintOpto && WizardMode) {
750 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
751 }
752 #endif
753 merge_exception(handler_bci); // jump to handler
754 return; // No more handling to be done here!
755 }
757 // Get the handler's klass
758 ciInstanceKlass* klass = handler->catch_klass();
760 if (!klass->is_loaded()) { // klass is not loaded?
761 // fall through into catch_call_exceptions which will emit a
762 // handler with an uncommon trap.
763 break;
764 }
766 if (klass->is_interface()) // should not happen, but...
767 break; // bail out
769 // Check the type of the exception against the catch type
770 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
771 Node* con = _gvn.makecon(tk);
772 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
773 if (!stopped()) {
774 PreserveJVMState pjvms(this);
775 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
776 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
777 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
778 push_ex_oop(ex_oop); // Push exception oop for handler
779 #ifndef PRODUCT
780 if (PrintOpto && WizardMode) {
781 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
782 klass->print_name();
783 tty->cr();
784 }
785 #endif
786 merge_exception(handler_bci);
787 }
788 set_control(not_subtype_ctrl);
790 // Come here if exception does not match handler.
791 // Carry on with more handler checks.
792 --remaining;
793 }
795 assert(!stopped(), "you should return if you finish the chain");
797 // Oops, need to call into the VM to resolve the klasses at runtime.
798 // Note: This call must not deoptimize, since it is not a real at this bci!
799 kill_dead_locals();
801 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
802 OptoRuntime::rethrow_Type(),
803 OptoRuntime::rethrow_stub(),
804 NULL, NULL,
805 ex_node);
807 // Rethrow is a pure call, no side effects, only a result.
808 // The result cannot be allocated, so we use I_O
810 // Catch exceptions from the rethrow
811 catch_call_exceptions(handlers);
812 }
815 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
818 #ifndef PRODUCT
819 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
820 if( CountCompiledCalls ) {
821 if( at_method_entry ) {
822 // bump invocation counter if top method (for statistics)
823 if (CountCompiledCalls && depth() == 1) {
824 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
825 Node* adr1 = makecon(addr_type);
826 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
827 increment_counter(adr2);
828 }
829 } else if (is_inline) {
830 switch (bc()) {
831 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
832 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
833 case Bytecodes::_invokestatic:
834 case Bytecodes::_invokedynamic:
835 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
836 default: fatal("unexpected call bytecode");
837 }
838 } else {
839 switch (bc()) {
840 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
841 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
842 case Bytecodes::_invokestatic:
843 case Bytecodes::_invokedynamic:
844 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
845 default: fatal("unexpected call bytecode");
846 }
847 }
848 }
849 }
850 #endif //PRODUCT
853 // Identify possible target method and inlining style
854 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
855 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
856 // only use for virtual or interface calls
858 // If it is obviously final, do not bother to call find_monomorphic_target,
859 // because the class hierarchy checks are not needed, and may fail due to
860 // incompletely loaded classes. Since we do our own class loading checks
861 // in this module, we may confidently bind to any method.
862 if (dest_method->can_be_statically_bound()) {
863 return dest_method;
864 }
866 // Attempt to improve the receiver
867 bool actual_receiver_is_exact = false;
868 ciInstanceKlass* actual_receiver = klass;
869 if (receiver_type != NULL) {
870 // Array methods are all inherited from Object, and are monomorphic.
871 if (receiver_type->isa_aryptr() &&
872 dest_method->holder() == env()->Object_klass()) {
873 return dest_method;
874 }
876 // All other interesting cases are instance klasses.
877 if (!receiver_type->isa_instptr()) {
878 return NULL;
879 }
881 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
882 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
883 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
884 // ikl is a same or better type than the original actual_receiver,
885 // e.g. static receiver from bytecodes.
886 actual_receiver = ikl;
887 // Is the actual_receiver exact?
888 actual_receiver_is_exact = receiver_type->klass_is_exact();
889 }
890 }
892 ciInstanceKlass* calling_klass = caller->holder();
893 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
894 if (cha_monomorphic_target != NULL) {
895 assert(!cha_monomorphic_target->is_abstract(), "");
896 // Look at the method-receiver type. Does it add "too much information"?
897 ciKlass* mr_klass = cha_monomorphic_target->holder();
898 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
899 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
900 // Calling this method would include an implicit cast to its holder.
901 // %%% Not yet implemented. Would throw minor asserts at present.
902 // %%% The most common wins are already gained by +UseUniqueSubclasses.
903 // To fix, put the higher_equal check at the call of this routine,
904 // and add a CheckCastPP to the receiver.
905 if (TraceDependencies) {
906 tty->print_cr("found unique CHA method, but could not cast up");
907 tty->print(" method = ");
908 cha_monomorphic_target->print();
909 tty->cr();
910 }
911 if (C->log() != NULL) {
912 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
913 C->log()->identify(klass),
914 C->log()->identify(cha_monomorphic_target));
915 }
916 cha_monomorphic_target = NULL;
917 }
918 }
919 if (cha_monomorphic_target != NULL) {
920 // Hardwiring a virtual.
921 // If we inlined because CHA revealed only a single target method,
922 // then we are dependent on that target method not getting overridden
923 // by dynamic class loading. Be sure to test the "static" receiver
924 // dest_method here, as opposed to the actual receiver, which may
925 // falsely lead us to believe that the receiver is final or private.
926 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
927 return cha_monomorphic_target;
928 }
930 // If the type is exact, we can still bind the method w/o a vcall.
931 // (This case comes after CHA so we can see how much extra work it does.)
932 if (actual_receiver_is_exact) {
933 // In case of evolution, there is a dependence on every inlined method, since each
934 // such method can be changed when its class is redefined.
935 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
936 if (exact_method != NULL) {
937 #ifndef PRODUCT
938 if (PrintOpto) {
939 tty->print(" Calling method via exact type @%d --- ", bci);
940 exact_method->print_name();
941 tty->cr();
942 }
943 #endif
944 return exact_method;
945 }
946 }
948 return NULL;
949 }