annotate src/share/vm/opto/doCall.cpp @ 1743:8aa5fd5d2046

6987634: JSR 292 assert(start_bci() >= 0 && start_bci() < code_size()) failed: correct osr_bci argument Reviewed-by: never, kvn
author twisti
date Wed, 29 Sep 2010 00:30:57 -0700
parents 3941674cc7fa
children f95d63e2154a
rev   line source
duke@0 1 /*
trims@1472 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
trims@1472 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1472 20 * or visit www.oracle.com if you need additional information or have any
trims@1472 21 * questions.
duke@0 22 *
duke@0 23 */
duke@0 24
duke@0 25 #include "incls/_precompiled.incl"
duke@0 26 #include "incls/_doCall.cpp.incl"
duke@0 27
duke@0 28 #ifndef PRODUCT
duke@0 29 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
duke@0 30 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) {
duke@0 31 tty->print(" ");
duke@0 32 for( int i = 0; i < depth; i++ ) tty->print(" ");
duke@0 33 if (!PrintOpto) {
duke@0 34 method->print_short_name();
duke@0 35 tty->print(" ->");
duke@0 36 }
duke@0 37 tty->print(" @ %d ", bci);
duke@0 38 prof_method->print_short_name();
duke@0 39 tty->print(" >>TypeProfile (%d/%d counts) = ", receiver_count, site_count);
duke@0 40 prof_klass->name()->print_symbol();
duke@0 41 tty->print_cr(" (%d bytes)", prof_method->code_size());
duke@0 42 }
duke@0 43 }
duke@0 44 #endif
duke@0 45
jrose@1157 46 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual,
jrose@1157 47 JVMState* jvms, bool allow_inline,
jrose@1157 48 float prof_factor) {
duke@0 49 CallGenerator* cg;
duke@0 50
duke@0 51 // Dtrace currently doesn't work unless all calls are vanilla
kvn@780 52 if (env()->dtrace_method_probes()) {
duke@0 53 allow_inline = false;
duke@0 54 }
duke@0 55
duke@0 56 // Note: When we get profiling during stage-1 compiles, we want to pull
duke@0 57 // from more specific profile data which pertains to this inlining.
duke@0 58 // Right now, ignore the information in jvms->caller(), and do method[bci].
duke@0 59 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci());
duke@0 60
duke@0 61 // See how many times this site has been invoked.
duke@0 62 int site_count = profile.count();
duke@0 63 int receiver_count = -1;
duke@0 64 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) {
duke@0 65 // Receivers in the profile structure are ordered by call counts
duke@0 66 // so that the most called (major) receiver is profile.receiver(0).
duke@0 67 receiver_count = profile.receiver_count(0);
duke@0 68 }
duke@0 69
duke@0 70 CompileLog* log = this->log();
duke@0 71 if (log != NULL) {
duke@0 72 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
kvn@1251 73 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
duke@0 74 log->begin_elem("call method='%d' count='%d' prof_factor='%g'",
duke@0 75 log->identify(call_method), site_count, prof_factor);
duke@0 76 if (call_is_virtual) log->print(" virtual='1'");
duke@0 77 if (allow_inline) log->print(" inline='1'");
duke@0 78 if (receiver_count >= 0) {
duke@0 79 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
duke@0 80 if (profile.has_receiver(1)) {
duke@0 81 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
duke@0 82 }
duke@0 83 }
duke@0 84 log->end_elem();
duke@0 85 }
duke@0 86
duke@0 87 // Special case the handling of certain common, profitable library
duke@0 88 // methods. If these methods are replaced with specialized code,
duke@0 89 // then we return it as the inlined version of the call.
duke@0 90 // We do this before the strict f.p. check below because the
duke@0 91 // intrinsics handle strict f.p. correctly.
duke@0 92 if (allow_inline) {
duke@0 93 cg = find_intrinsic(call_method, call_is_virtual);
duke@0 94 if (cg != NULL) return cg;
duke@0 95 }
duke@0 96
twisti@1743 97 // Do MethodHandle calls.
twisti@1743 98 // NOTE: This must happen before normal inlining logic below since
twisti@1743 99 // MethodHandle.invoke* are native methods which obviously don't
twisti@1743 100 // have bytecodes and so normal inlining fails.
twisti@1743 101 if (call_method->is_method_handle_invoke()) {
twisti@1743 102 if (jvms->method()->java_code_at_bci(jvms->bci()) != Bytecodes::_invokedynamic) {
twisti@1743 103 GraphKit kit(jvms);
twisti@1743 104 Node* n = kit.argument(0);
twisti@1743 105
twisti@1743 106 if (n->Opcode() == Op_ConP) {
twisti@1743 107 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr();
twisti@1743 108 ciObject* const_oop = oop_ptr->const_oop();
twisti@1743 109 ciMethodHandle* method_handle = const_oop->as_method_handle();
twisti@1743 110
twisti@1743 111 // Set the actually called method to have access to the class
twisti@1743 112 // and signature in the MethodHandleCompiler.
twisti@1743 113 method_handle->set_callee(call_method);
twisti@1743 114
twisti@1743 115 // Get an adapter for the MethodHandle.
twisti@1743 116 ciMethod* target_method = method_handle->get_method_handle_adapter();
twisti@1743 117
twisti@1743 118 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
twisti@1743 119 if (hit_cg != NULL && hit_cg->is_inline())
twisti@1743 120 return hit_cg;
twisti@1743 121 }
twisti@1743 122
twisti@1743 123 return CallGenerator::for_direct_call(call_method);
twisti@1743 124 }
twisti@1743 125 else {
twisti@1743 126 // Get the MethodHandle from the CallSite.
twisti@1743 127 ciMethod* caller_method = jvms->method();
twisti@1743 128 ciBytecodeStream str(caller_method);
twisti@1743 129 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci.
twisti@1743 130 ciCallSite* call_site = str.get_call_site();
twisti@1743 131 ciMethodHandle* method_handle = call_site->get_target();
twisti@1743 132
twisti@1743 133 // Set the actually called method to have access to the class
twisti@1743 134 // and signature in the MethodHandleCompiler.
twisti@1743 135 method_handle->set_callee(call_method);
twisti@1743 136
twisti@1743 137 // Get an adapter for the MethodHandle.
twisti@1743 138 ciMethod* target_method = method_handle->get_invokedynamic_adapter();
twisti@1743 139
twisti@1743 140 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor);
twisti@1743 141 if (hit_cg != NULL && hit_cg->is_inline()) {
twisti@1743 142 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method);
twisti@1743 143 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor);
twisti@1743 144 }
twisti@1743 145
twisti@1743 146 // If something failed, generate a normal dynamic call.
twisti@1743 147 return CallGenerator::for_dynamic_call(call_method);
twisti@1743 148 }
twisti@1743 149 }
twisti@1743 150
duke@0 151 // Do not inline strict fp into non-strict code, or the reverse
duke@0 152 bool caller_method_is_strict = jvms->method()->is_strict();
duke@0 153 if( caller_method_is_strict ^ call_method->is_strict() ) {
duke@0 154 allow_inline = false;
duke@0 155 }
duke@0 156
duke@0 157 // Attempt to inline...
duke@0 158 if (allow_inline) {
duke@0 159 // The profile data is only partly attributable to this caller,
duke@0 160 // scale back the call site information.
duke@0 161 float past_uses = jvms->method()->scale_count(site_count, prof_factor);
duke@0 162 // This is the number of times we expect the call code to be used.
duke@0 163 float expected_uses = past_uses;
duke@0 164
duke@0 165 // Try inlining a bytecoded method:
duke@0 166 if (!call_is_virtual) {
duke@0 167 InlineTree* ilt;
duke@0 168 if (UseOldInlining) {
duke@0 169 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
duke@0 170 } else {
duke@0 171 // Make a disembodied, stateless ILT.
duke@0 172 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere.
duke@0 173 float site_invoke_ratio = prof_factor;
duke@0 174 // Note: ilt is for the root of this parse, not the present call site.
jrose@1157 175 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0);
duke@0 176 }
duke@0 177 WarmCallInfo scratch_ci;
duke@0 178 if (!UseOldInlining)
duke@0 179 scratch_ci.init(jvms, call_method, profile, prof_factor);
duke@0 180 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci);
duke@0 181 assert(ci != &scratch_ci, "do not let this pointer escape");
duke@0 182 bool allow_inline = (ci != NULL && !ci->is_cold());
duke@0 183 bool require_inline = (allow_inline && ci->is_hot());
duke@0 184
duke@0 185 if (allow_inline) {
duke@0 186 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses);
never@1080 187 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) {
never@1080 188 // Delay the inlining of this method to give us the
never@1080 189 // opportunity to perform some high level optimizations
never@1080 190 // first.
never@1080 191 return CallGenerator::for_late_inline(call_method, cg);
never@1080 192 }
duke@0 193 if (cg == NULL) {
duke@0 194 // Fall through.
duke@0 195 } else if (require_inline || !InlineWarmCalls) {
duke@0 196 return cg;
duke@0 197 } else {
duke@0 198 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor);
duke@0 199 return CallGenerator::for_warm_call(ci, cold_cg, cg);
duke@0 200 }
duke@0 201 }
duke@0 202 }
duke@0 203
duke@0 204 // Try using the type profile.
duke@0 205 if (call_is_virtual && site_count > 0 && receiver_count > 0) {
duke@0 206 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
duke@0 207 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
duke@0 208 ciMethod* receiver_method = NULL;
duke@0 209 if (have_major_receiver || profile.morphism() == 1 ||
duke@0 210 (profile.morphism() == 2 && UseBimorphicInlining)) {
duke@0 211 // receiver_method = profile.method();
duke@0 212 // Profiles do not suggest methods now. Look it up in the major receiver.
duke@0 213 receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
duke@0 214 profile.receiver(0));
duke@0 215 }
duke@0 216 if (receiver_method != NULL) {
duke@0 217 // The single majority receiver sufficiently outweighs the minority.
duke@0 218 CallGenerator* hit_cg = this->call_generator(receiver_method,
duke@0 219 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor);
duke@0 220 if (hit_cg != NULL) {
duke@0 221 // Look up second receiver.
duke@0 222 CallGenerator* next_hit_cg = NULL;
duke@0 223 ciMethod* next_receiver_method = NULL;
duke@0 224 if (profile.morphism() == 2 && UseBimorphicInlining) {
duke@0 225 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(),
duke@0 226 profile.receiver(1));
duke@0 227 if (next_receiver_method != NULL) {
duke@0 228 next_hit_cg = this->call_generator(next_receiver_method,
duke@0 229 vtable_index, !call_is_virtual, jvms,
duke@0 230 allow_inline, prof_factor);
duke@0 231 if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
duke@0 232 have_major_receiver && UseOnlyInlinedBimorphic) {
duke@0 233 // Skip if we can't inline second receiver's method
duke@0 234 next_hit_cg = NULL;
duke@0 235 }
duke@0 236 }
duke@0 237 }
duke@0 238 CallGenerator* miss_cg;
kvn@1206 239 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ?
kvn@1206 240 Deoptimization::Reason_bimorphic :
kvn@1206 241 Deoptimization::Reason_class_check;
duke@0 242 if (( profile.morphism() == 1 ||
duke@0 243 (profile.morphism() == 2 && next_hit_cg != NULL) ) &&
kvn@1206 244 !too_many_traps(jvms->method(), jvms->bci(), reason)
duke@0 245 ) {
duke@0 246 // Generate uncommon trap for class check failure path
duke@0 247 // in case of monomorphic or bimorphic virtual call site.
kvn@1206 248 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason,
duke@0 249 Deoptimization::Action_maybe_recompile);
duke@0 250 } else {
duke@0 251 // Generate virtual call for class check failure path
duke@0 252 // in case of polymorphic virtual call site.
duke@0 253 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index);
duke@0 254 }
duke@0 255 if (miss_cg != NULL) {
duke@0 256 if (next_hit_cg != NULL) {
duke@0 257 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)));
duke@0 258 // We don't need to record dependency on a receiver here and below.
duke@0 259 // Whenever we inline, the dependency is added by Parse::Parse().
duke@0 260 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
duke@0 261 }
duke@0 262 if (miss_cg != NULL) {
duke@0 263 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth(), jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count));
duke@0 264 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0));
duke@0 265 if (cg != NULL) return cg;
duke@0 266 }
duke@0 267 }
duke@0 268 }
duke@0 269 }
duke@0 270 }
duke@0 271 }
duke@0 272
duke@0 273 // There was no special inlining tactic, or it bailed out.
duke@0 274 // Use a more generic tactic, like a simple call.
duke@0 275 if (call_is_virtual) {
duke@0 276 return CallGenerator::for_virtual_call(call_method, vtable_index);
duke@0 277 } else {
duke@0 278 // Class Hierarchy Analysis or Type Profile reveals a unique target,
duke@0 279 // or it is a static or special call.
never@1080 280 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms));
duke@0 281 }
duke@0 282 }
duke@0 283
never@1080 284 // Return true for methods that shouldn't be inlined early so that
never@1080 285 // they are easier to analyze and optimize as intrinsics.
never@1080 286 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) {
never@1080 287 if (has_stringbuilder()) {
never@1080 288
never@1080 289 if ((call_method->holder() == C->env()->StringBuilder_klass() ||
never@1080 290 call_method->holder() == C->env()->StringBuffer_klass()) &&
never@1080 291 (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
never@1080 292 jvms->method()->holder() == C->env()->StringBuffer_klass())) {
never@1080 293 // Delay SB calls only when called from non-SB code
never@1080 294 return false;
never@1080 295 }
never@1080 296
never@1080 297 switch (call_method->intrinsic_id()) {
never@1080 298 case vmIntrinsics::_StringBuilder_void:
never@1080 299 case vmIntrinsics::_StringBuilder_int:
never@1080 300 case vmIntrinsics::_StringBuilder_String:
never@1080 301 case vmIntrinsics::_StringBuilder_append_char:
never@1080 302 case vmIntrinsics::_StringBuilder_append_int:
never@1080 303 case vmIntrinsics::_StringBuilder_append_String:
never@1080 304 case vmIntrinsics::_StringBuilder_toString:
never@1080 305 case vmIntrinsics::_StringBuffer_void:
never@1080 306 case vmIntrinsics::_StringBuffer_int:
never@1080 307 case vmIntrinsics::_StringBuffer_String:
never@1080 308 case vmIntrinsics::_StringBuffer_append_char:
never@1080 309 case vmIntrinsics::_StringBuffer_append_int:
never@1080 310 case vmIntrinsics::_StringBuffer_append_String:
never@1080 311 case vmIntrinsics::_StringBuffer_toString:
never@1080 312 case vmIntrinsics::_Integer_toString:
never@1080 313 return true;
never@1080 314
never@1080 315 case vmIntrinsics::_String_String:
never@1080 316 {
never@1080 317 Node* receiver = jvms->map()->in(jvms->argoff() + 1);
never@1080 318 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
never@1080 319 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
never@1080 320 ciMethod* m = csj->method();
never@1080 321 if (m != NULL &&
never@1080 322 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
never@1080 323 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
never@1080 324 // Delay String.<init>(new SB())
never@1080 325 return true;
never@1080 326 }
never@1080 327 return false;
never@1080 328 }
never@1080 329
never@1080 330 default:
never@1080 331 return false;
never@1080 332 }
never@1080 333 }
never@1080 334 return false;
never@1080 335 }
never@1080 336
duke@0 337
duke@0 338 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
duke@0 339 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
duke@0 340 // Additional inputs to consider...
duke@0 341 // bc = bc()
duke@0 342 // caller = method()
duke@0 343 // iter().get_method_holder_index()
duke@0 344 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
duke@0 345 // Interface classes can be loaded & linked and never get around to
duke@0 346 // being initialized. Uncommon-trap for not-initialized static or
duke@0 347 // v-calls. Let interface calls happen.
twisti@1137 348 ciInstanceKlass* holder_klass = dest_method->holder();
never@1565 349 if (!holder_klass->is_being_initialized() &&
never@1565 350 !holder_klass->is_initialized() &&
duke@0 351 !holder_klass->is_interface()) {
duke@0 352 uncommon_trap(Deoptimization::Reason_uninitialized,
duke@0 353 Deoptimization::Action_reinterpret,
duke@0 354 holder_klass);
duke@0 355 return true;
duke@0 356 }
duke@0 357
duke@0 358 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility");
duke@0 359 return false;
duke@0 360 }
duke@0 361
duke@0 362
duke@0 363 //------------------------------do_call----------------------------------------
duke@0 364 // Handle your basic call. Inline if we can & want to, else just setup call.
duke@0 365 void Parse::do_call() {
duke@0 366 // It's likely we are going to add debug info soon.
duke@0 367 // Also, if we inline a guy who eventually needs debug info for this JVMS,
duke@0 368 // our contribution to it is cleaned up right here.
duke@0 369 kill_dead_locals();
duke@0 370
duke@0 371 // Set frequently used booleans
duke@0 372 bool is_virtual = bc() == Bytecodes::_invokevirtual;
duke@0 373 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
duke@0 374 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
twisti@1137 375 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic;
duke@0 376
duke@0 377 // Find target being called
duke@0 378 bool will_link;
duke@0 379 ciMethod* dest_method = iter().get_method(will_link);
duke@0 380 ciInstanceKlass* holder_klass = dest_method->holder();
duke@0 381 ciKlass* holder = iter().get_declared_method_holder();
duke@0 382 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
duke@0 383
twisti@1137 384 int nargs = dest_method->arg_size();
twisti@1137 385 if (is_invokedynamic) nargs -= 1;
duke@0 386
duke@0 387 // uncommon-trap when callee is unloaded, uninitialized or will not link
duke@0 388 // bailout when too many arguments for register representation
duke@0 389 if (!will_link || can_not_compile_call_site(dest_method, klass)) {
duke@0 390 #ifndef PRODUCT
duke@0 391 if (PrintOpto && (Verbose || WizardMode)) {
duke@0 392 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
duke@0 393 dest_method->print_name(); tty->cr();
duke@0 394 }
duke@0 395 #endif
duke@0 396 return;
duke@0 397 }
duke@0 398 assert(holder_klass->is_loaded(), "");
twisti@1137 399 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc");
duke@0 400 // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
duke@0 401 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
duke@0 402 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
duke@0 403 // Note: In the absence of miranda methods, an abstract class K can perform
duke@0 404 // an invokevirtual directly on an interface method I.m if K implements I.
duke@0 405
duke@0 406 // ---------------------
duke@0 407 // Does Class Hierarchy Analysis reveal only a single target of a v-call?
duke@0 408 // Then we may inline or make a static call, but become dependent on there being only 1 target.
duke@0 409 // Does the call-site type profile reveal only one receiver?
duke@0 410 // Then we may introduce a run-time check and inline on the path where it succeeds.
duke@0 411 // The other path may uncommon_trap, check for another receiver, or do a v-call.
duke@0 412
duke@0 413 // Choose call strategy.
duke@0 414 bool call_is_virtual = is_virtual_or_interface;
duke@0 415 int vtable_index = methodOopDesc::invalid_vtable_index;
duke@0 416 ciMethod* call_method = dest_method;
duke@0 417
duke@0 418 // Try to get the most accurate receiver type
duke@0 419 if (is_virtual_or_interface) {
duke@0 420 Node* receiver_node = stack(sp() - nargs);
duke@0 421 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
duke@0 422 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
duke@0 423
duke@0 424 // Have the call been sufficiently improved such that it is no longer a virtual?
duke@0 425 if (optimized_virtual_method != NULL) {
duke@0 426 call_method = optimized_virtual_method;
duke@0 427 call_is_virtual = false;
duke@0 428 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) {
duke@0 429 // We can make a vtable call at this site
duke@0 430 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
duke@0 431 }
duke@0 432 }
duke@0 433
duke@0 434 // Note: It's OK to try to inline a virtual call.
duke@0 435 // The call generator will not attempt to inline a polymorphic call
duke@0 436 // unless it knows how to optimize the receiver dispatch.
duke@0 437 bool try_inline = (C->do_inlining() || InlineAccessors);
duke@0 438
duke@0 439 // ---------------------
duke@0 440 inc_sp(- nargs); // Temporarily pop args for JVM state of call
duke@0 441 JVMState* jvms = sync_jvms();
duke@0 442
duke@0 443 // ---------------------
duke@0 444 // Decide call tactic.
duke@0 445 // This call checks with CHA, the interpreter profile, intrinsics table, etc.
duke@0 446 // It decides whether inlining is desirable or not.
duke@0 447 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
duke@0 448
duke@0 449 // ---------------------
duke@0 450 // Round double arguments before call
duke@0 451 round_double_arguments(dest_method);
duke@0 452
duke@0 453 #ifndef PRODUCT
duke@0 454 // bump global counters for calls
duke@0 455 count_compiled_calls(false/*at_method_entry*/, cg->is_inline());
duke@0 456
duke@0 457 // Record first part of parsing work for this call
duke@0 458 parse_histogram()->record_change();
duke@0 459 #endif // not PRODUCT
duke@0 460
duke@0 461 assert(jvms == this->jvms(), "still operating on the right JVMS");
duke@0 462 assert(jvms_in_sync(), "jvms must carry full info into CG");
duke@0 463
duke@0 464 // save across call, for a subsequent cast_not_null.
duke@0 465 Node* receiver = has_receiver ? argument(0) : NULL;
duke@0 466
duke@0 467 // Bump method data counters (We profile *before* the call is made
duke@0 468 // because exceptions don't return to the call site.)
duke@0 469 profile_call(receiver);
duke@0 470
duke@0 471 JVMState* new_jvms;
duke@0 472 if ((new_jvms = cg->generate(jvms)) == NULL) {
duke@0 473 // When inlining attempt fails (e.g., too many arguments),
duke@0 474 // it may contaminate the current compile state, making it
duke@0 475 // impossible to pull back and try again. Once we call
duke@0 476 // cg->generate(), we are committed. If it fails, the whole
duke@0 477 // compilation task is compromised.
duke@0 478 if (failing()) return;
duke@0 479 #ifndef PRODUCT
duke@0 480 if (PrintOpto || PrintOptoInlining || PrintInlining) {
duke@0 481 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
duke@0 482 if (cg->is_intrinsic() && call_method->code_size() > 0) {
duke@0 483 tty->print("Bailed out of intrinsic, will not inline: ");
duke@0 484 call_method->print_name(); tty->cr();
duke@0 485 }
duke@0 486 }
duke@0 487 #endif
duke@0 488 // This can happen if a library intrinsic is available, but refuses
duke@0 489 // the call site, perhaps because it did not match a pattern the
duke@0 490 // intrinsic was expecting to optimize. The fallback position is
duke@0 491 // to call out-of-line.
duke@0 492 try_inline = false; // Inline tactic bailed out.
duke@0 493 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor());
duke@0 494 if ((new_jvms = cg->generate(jvms)) == NULL) {
duke@0 495 guarantee(failing(), "call failed to generate: calls should work");
duke@0 496 return;
duke@0 497 }
duke@0 498 }
duke@0 499
duke@0 500 if (cg->is_inline()) {
never@67 501 // Accumulate has_loops estimate
never@67 502 C->set_has_loops(C->has_loops() || call_method->has_loops());
duke@0 503 C->env()->notice_inlined_method(call_method);
duke@0 504 }
duke@0 505
duke@0 506 // Reset parser state from [new_]jvms, which now carries results of the call.
duke@0 507 // Return value (if any) is already pushed on the stack by the cg.
duke@0 508 add_exception_states_from(new_jvms);
duke@0 509 if (new_jvms->map()->control() == top()) {
duke@0 510 stop_and_kill_map();
duke@0 511 } else {
duke@0 512 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
duke@0 513 set_jvms(new_jvms);
duke@0 514 }
duke@0 515
duke@0 516 if (!stopped()) {
duke@0 517 // This was some sort of virtual call, which did a null check for us.
duke@0 518 // Now we can assert receiver-not-null, on the normal return path.
duke@0 519 if (receiver != NULL && cg->is_virtual()) {
duke@0 520 Node* cast = cast_not_null(receiver);
duke@0 521 // %%% assert(receiver == cast, "should already have cast the receiver");
duke@0 522 }
duke@0 523
duke@0 524 // Round double result after a call from strict to non-strict code
duke@0 525 round_double_result(dest_method);
duke@0 526
duke@0 527 // If the return type of the method is not loaded, assert that the
duke@0 528 // value we got is a null. Otherwise, we need to recompile.
duke@0 529 if (!dest_method->return_type()->is_loaded()) {
duke@0 530 #ifndef PRODUCT
duke@0 531 if (PrintOpto && (Verbose || WizardMode)) {
duke@0 532 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
duke@0 533 dest_method->print_name(); tty->cr();
duke@0 534 }
duke@0 535 #endif
duke@0 536 if (C->log() != NULL) {
duke@0 537 C->log()->elem("assert_null reason='return' klass='%d'",
duke@0 538 C->log()->identify(dest_method->return_type()));
duke@0 539 }
duke@0 540 // If there is going to be a trap, put it at the next bytecode:
duke@0 541 set_bci(iter().next_bci());
duke@0 542 do_null_assert(peek(), T_OBJECT);
duke@0 543 set_bci(iter().cur_bci()); // put it back
duke@0 544 }
duke@0 545 }
duke@0 546
duke@0 547 // Restart record of parsing work after possible inlining of call
duke@0 548 #ifndef PRODUCT
duke@0 549 parse_histogram()->set_initial_state(bc());
duke@0 550 #endif
duke@0 551 }
duke@0 552
duke@0 553 //---------------------------catch_call_exceptions-----------------------------
duke@0 554 // Put a Catch and CatchProj nodes behind a just-created call.
duke@0 555 // Send their caught exceptions to the proper handler.
duke@0 556 // This may be used after a call to the rethrow VM stub,
duke@0 557 // when it is needed to process unloaded exception classes.
duke@0 558 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
duke@0 559 // Exceptions are delivered through this channel:
duke@0 560 Node* i_o = this->i_o();
duke@0 561
duke@0 562 // Add a CatchNode.
duke@0 563 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
duke@0 564 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
duke@0 565 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
duke@0 566
duke@0 567 for (; !handlers.is_done(); handlers.next()) {
duke@0 568 ciExceptionHandler* h = handlers.handler();
duke@0 569 int h_bci = h->handler_bci();
duke@0 570 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
duke@0 571 // Do not introduce unloaded exception types into the graph:
duke@0 572 if (!h_klass->is_loaded()) {
duke@0 573 if (saw_unloaded->contains(h_bci)) {
duke@0 574 /* We've already seen an unloaded exception with h_bci,
duke@0 575 so don't duplicate. Duplication will cause the CatchNode to be
duke@0 576 unnecessarily large. See 4713716. */
duke@0 577 continue;
duke@0 578 } else {
duke@0 579 saw_unloaded->append(h_bci);
duke@0 580 }
duke@0 581 }
duke@0 582 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
duke@0 583 // (We use make_from_klass because it respects UseUniqueSubclasses.)
duke@0 584 h_extype = h_extype->join(TypeInstPtr::NOTNULL);
duke@0 585 assert(!h_extype->empty(), "sanity");
duke@0 586 // Note: It's OK if the BCIs repeat themselves.
duke@0 587 bcis->append(h_bci);
duke@0 588 extypes->append(h_extype);
duke@0 589 }
duke@0 590
duke@0 591 int len = bcis->length();
duke@0 592 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1);
duke@0 593 Node *catch_ = _gvn.transform(cn);
duke@0 594
duke@0 595 // now branch with the exception state to each of the (potential)
duke@0 596 // handlers
duke@0 597 for(int i=0; i < len; i++) {
duke@0 598 // Setup JVM state to enter the handler.
duke@0 599 PreserveJVMState pjvms(this);
duke@0 600 // Locals are just copied from before the call.
duke@0 601 // Get control from the CatchNode.
duke@0 602 int handler_bci = bcis->at(i);
duke@0 603 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci));
duke@0 604 // This handler cannot happen?
duke@0 605 if (ctrl == top()) continue;
duke@0 606 set_control(ctrl);
duke@0 607
duke@0 608 // Create exception oop
duke@0 609 const TypeInstPtr* extype = extypes->at(i)->is_instptr();
duke@0 610 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o));
duke@0 611
duke@0 612 // Handle unloaded exception classes.
duke@0 613 if (saw_unloaded->contains(handler_bci)) {
duke@0 614 // An unloaded exception type is coming here. Do an uncommon trap.
duke@0 615 #ifndef PRODUCT
duke@0 616 // We do not expect the same handler bci to take both cold unloaded
duke@0 617 // and hot loaded exceptions. But, watch for it.
duke@0 618 if (extype->is_loaded()) {
duke@0 619 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ");
duke@0 620 method()->print_name(); tty->cr();
duke@0 621 } else if (PrintOpto && (Verbose || WizardMode)) {
duke@0 622 tty->print("Bailing out on unloaded exception type ");
duke@0 623 extype->klass()->print_name();
duke@0 624 tty->print(" at bci:%d in ", bci());
duke@0 625 method()->print_name(); tty->cr();
duke@0 626 }
duke@0 627 #endif
duke@0 628 // Emit an uncommon trap instead of processing the block.
duke@0 629 set_bci(handler_bci);
duke@0 630 push_ex_oop(ex_oop);
duke@0 631 uncommon_trap(Deoptimization::Reason_unloaded,
duke@0 632 Deoptimization::Action_reinterpret,
duke@0 633 extype->klass(), "!loaded exception");
duke@0 634 set_bci(iter().cur_bci()); // put it back
duke@0 635 continue;
duke@0 636 }
duke@0 637
duke@0 638 // go to the exception handler
duke@0 639 if (handler_bci < 0) { // merge with corresponding rethrow node
duke@0 640 throw_to_exit(make_exception_state(ex_oop));
duke@0 641 } else { // Else jump to corresponding handle
duke@0 642 push_ex_oop(ex_oop); // Clear stack and push just the oop.
duke@0 643 merge_exception(handler_bci);
duke@0 644 }
duke@0 645 }
duke@0 646
duke@0 647 // The first CatchProj is for the normal return.
duke@0 648 // (Note: If this is a call to rethrow_Java, this node goes dead.)
duke@0 649 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
duke@0 650 }
duke@0 651
duke@0 652
duke@0 653 //----------------------------catch_inline_exceptions--------------------------
duke@0 654 // Handle all exceptions thrown by an inlined method or individual bytecode.
duke@0 655 // Common case 1: we have no handler, so all exceptions merge right into
duke@0 656 // the rethrow case.
duke@0 657 // Case 2: we have some handlers, with loaded exception klasses that have
duke@0 658 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming
duke@0 659 // exception oop and branch to the handler directly.
duke@0 660 // Case 3: We have some handlers with subklasses or are not loaded at
duke@0 661 // compile-time. We have to call the runtime to resolve the exception.
duke@0 662 // So we insert a RethrowCall and all the logic that goes with it.
duke@0 663 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
duke@0 664 // Caller is responsible for saving away the map for normal control flow!
duke@0 665 assert(stopped(), "call set_map(NULL) first");
duke@0 666 assert(method()->has_exception_handlers(), "don't come here w/o work to do");
duke@0 667
duke@0 668 Node* ex_node = saved_ex_oop(ex_map);
duke@0 669 if (ex_node == top()) {
duke@0 670 // No action needed.
duke@0 671 return;
duke@0 672 }
duke@0 673 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
duke@0 674 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
duke@0 675 if (ex_type == NULL)
duke@0 676 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
duke@0 677
duke@0 678 // determine potential exception handlers
duke@0 679 ciExceptionHandlerStream handlers(method(), bci(),
duke@0 680 ex_type->klass()->as_instance_klass(),
duke@0 681 ex_type->klass_is_exact());
duke@0 682
duke@0 683 // Start executing from the given throw state. (Keep its stack, for now.)
duke@0 684 // Get the exception oop as known at compile time.
duke@0 685 ex_node = use_exception_state(ex_map);
duke@0 686
duke@0 687 // Get the exception oop klass from its header
duke@0 688 Node* ex_klass_node = NULL;
duke@0 689 if (has_ex_handler() && !ex_type->klass_is_exact()) {
duke@0 690 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
kvn@164 691 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
duke@0 692
duke@0 693 // Compute the exception klass a little more cleverly.
duke@0 694 // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
duke@0 695 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
duke@0 696 // each arm of the Phi. If I know something clever about the exceptions
duke@0 697 // I'm loading the class from, I can replace the LoadKlass with the
duke@0 698 // klass constant for the exception oop.
duke@0 699 if( ex_node->is_Phi() ) {
duke@0 700 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT );
duke@0 701 for( uint i = 1; i < ex_node->req(); i++ ) {
duke@0 702 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() );
kvn@164 703 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) );
duke@0 704 ex_klass_node->init_req( i, k );
duke@0 705 }
duke@0 706 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT);
duke@0 707
duke@0 708 }
duke@0 709 }
duke@0 710
duke@0 711 // Scan the exception table for applicable handlers.
duke@0 712 // If none, we can call rethrow() and be done!
duke@0 713 // If precise (loaded with no subklasses), insert a D.S. style
duke@0 714 // pointer compare to the correct handler and loop back.
duke@0 715 // If imprecise, switch to the Rethrow VM-call style handling.
duke@0 716
duke@0 717 int remaining = handlers.count_remaining();
duke@0 718
duke@0 719 // iterate through all entries sequentially
duke@0 720 for (;!handlers.is_done(); handlers.next()) {
duke@0 721 ciExceptionHandler* handler = handlers.handler();
duke@0 722
duke@0 723 if (handler->is_rethrow()) {
duke@0 724 // If we fell off the end of the table without finding an imprecise
duke@0 725 // exception klass (and without finding a generic handler) then we
duke@0 726 // know this exception is not handled in this method. We just rethrow
duke@0 727 // the exception into the caller.
duke@0 728 throw_to_exit(make_exception_state(ex_node));
duke@0 729 return;
duke@0 730 }
duke@0 731
duke@0 732 // exception handler bci range covers throw_bci => investigate further
duke@0 733 int handler_bci = handler->handler_bci();
duke@0 734
duke@0 735 if (remaining == 1) {
duke@0 736 push_ex_oop(ex_node); // Push exception oop for handler
duke@0 737 #ifndef PRODUCT
duke@0 738 if (PrintOpto && WizardMode) {
duke@0 739 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
duke@0 740 }
duke@0 741 #endif
duke@0 742 merge_exception(handler_bci); // jump to handler
duke@0 743 return; // No more handling to be done here!
duke@0 744 }
duke@0 745
never@1344 746 // Get the handler's klass
never@1344 747 ciInstanceKlass* klass = handler->catch_klass();
duke@0 748
never@1344 749 if (!klass->is_loaded()) { // klass is not loaded?
never@1344 750 // fall through into catch_call_exceptions which will emit a
never@1344 751 // handler with an uncommon trap.
never@1344 752 break;
duke@0 753 }
duke@0 754
duke@0 755 if (klass->is_interface()) // should not happen, but...
duke@0 756 break; // bail out
duke@0 757
never@1344 758 // Check the type of the exception against the catch type
duke@0 759 const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
duke@0 760 Node* con = _gvn.makecon(tk);
never@1344 761 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
never@1344 762 if (!stopped()) {
never@1344 763 PreserveJVMState pjvms(this);
never@1344 764 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
never@1344 765 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
duke@0 766 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst));
duke@0 767 push_ex_oop(ex_oop); // Push exception oop for handler
duke@0 768 #ifndef PRODUCT
duke@0 769 if (PrintOpto && WizardMode) {
duke@0 770 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
duke@0 771 klass->print_name();
duke@0 772 tty->cr();
duke@0 773 }
duke@0 774 #endif
duke@0 775 merge_exception(handler_bci);
duke@0 776 }
never@1344 777 set_control(not_subtype_ctrl);
duke@0 778
duke@0 779 // Come here if exception does not match handler.
duke@0 780 // Carry on with more handler checks.
duke@0 781 --remaining;
duke@0 782 }
duke@0 783
duke@0 784 assert(!stopped(), "you should return if you finish the chain");
duke@0 785
duke@0 786 // Oops, need to call into the VM to resolve the klasses at runtime.
duke@0 787 // Note: This call must not deoptimize, since it is not a real at this bci!
duke@0 788 kill_dead_locals();
duke@0 789
duke@0 790 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
duke@0 791 OptoRuntime::rethrow_Type(),
duke@0 792 OptoRuntime::rethrow_stub(),
duke@0 793 NULL, NULL,
duke@0 794 ex_node);
duke@0 795
duke@0 796 // Rethrow is a pure call, no side effects, only a result.
duke@0 797 // The result cannot be allocated, so we use I_O
duke@0 798
duke@0 799 // Catch exceptions from the rethrow
duke@0 800 catch_call_exceptions(handlers);
duke@0 801 }
duke@0 802
duke@0 803
duke@0 804 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.)
duke@0 805
duke@0 806
duke@0 807 #ifndef PRODUCT
duke@0 808 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
duke@0 809 if( CountCompiledCalls ) {
duke@0 810 if( at_method_entry ) {
duke@0 811 // bump invocation counter if top method (for statistics)
duke@0 812 if (CountCompiledCalls && depth() == 1) {
duke@0 813 const TypeInstPtr* addr_type = TypeInstPtr::make(method());
duke@0 814 Node* adr1 = makecon(addr_type);
duke@0 815 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset()));
duke@0 816 increment_counter(adr2);
duke@0 817 }
duke@0 818 } else if (is_inline) {
duke@0 819 switch (bc()) {
duke@0 820 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
duke@0 821 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
duke@0 822 case Bytecodes::_invokestatic:
jrose@726 823 case Bytecodes::_invokedynamic:
duke@0 824 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
duke@0 825 default: fatal("unexpected call bytecode");
duke@0 826 }
duke@0 827 } else {
duke@0 828 switch (bc()) {
duke@0 829 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
duke@0 830 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
duke@0 831 case Bytecodes::_invokestatic:
jrose@726 832 case Bytecodes::_invokedynamic:
duke@0 833 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break;
duke@0 834 default: fatal("unexpected call bytecode");
duke@0 835 }
duke@0 836 }
duke@0 837 }
duke@0 838 }
duke@0 839 #endif //PRODUCT
duke@0 840
duke@0 841
duke@0 842 // Identify possible target method and inlining style
duke@0 843 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,
duke@0 844 ciMethod *dest_method, const TypeOopPtr* receiver_type) {
duke@0 845 // only use for virtual or interface calls
duke@0 846
duke@0 847 // If it is obviously final, do not bother to call find_monomorphic_target,
duke@0 848 // because the class hierarchy checks are not needed, and may fail due to
duke@0 849 // incompletely loaded classes. Since we do our own class loading checks
duke@0 850 // in this module, we may confidently bind to any method.
duke@0 851 if (dest_method->can_be_statically_bound()) {
duke@0 852 return dest_method;
duke@0 853 }
duke@0 854
duke@0 855 // Attempt to improve the receiver
duke@0 856 bool actual_receiver_is_exact = false;
duke@0 857 ciInstanceKlass* actual_receiver = klass;
duke@0 858 if (receiver_type != NULL) {
duke@0 859 // Array methods are all inherited from Object, and are monomorphic.
duke@0 860 if (receiver_type->isa_aryptr() &&
duke@0 861 dest_method->holder() == env()->Object_klass()) {
duke@0 862 return dest_method;
duke@0 863 }
duke@0 864
duke@0 865 // All other interesting cases are instance klasses.
duke@0 866 if (!receiver_type->isa_instptr()) {
duke@0 867 return NULL;
duke@0 868 }
duke@0 869
duke@0 870 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass();
duke@0 871 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() &&
never@367 872 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) {
duke@0 873 // ikl is a same or better type than the original actual_receiver,
duke@0 874 // e.g. static receiver from bytecodes.
duke@0 875 actual_receiver = ikl;
duke@0 876 // Is the actual_receiver exact?
duke@0 877 actual_receiver_is_exact = receiver_type->klass_is_exact();
duke@0 878 }
duke@0 879 }
duke@0 880
duke@0 881 ciInstanceKlass* calling_klass = caller->holder();
duke@0 882 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver);
duke@0 883 if (cha_monomorphic_target != NULL) {
duke@0 884 assert(!cha_monomorphic_target->is_abstract(), "");
duke@0 885 // Look at the method-receiver type. Does it add "too much information"?
duke@0 886 ciKlass* mr_klass = cha_monomorphic_target->holder();
duke@0 887 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass);
duke@0 888 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) {
duke@0 889 // Calling this method would include an implicit cast to its holder.
duke@0 890 // %%% Not yet implemented. Would throw minor asserts at present.
duke@0 891 // %%% The most common wins are already gained by +UseUniqueSubclasses.
duke@0 892 // To fix, put the higher_equal check at the call of this routine,
duke@0 893 // and add a CheckCastPP to the receiver.
duke@0 894 if (TraceDependencies) {
duke@0 895 tty->print_cr("found unique CHA method, but could not cast up");
duke@0 896 tty->print(" method = ");
duke@0 897 cha_monomorphic_target->print();
duke@0 898 tty->cr();
duke@0 899 }
duke@0 900 if (C->log() != NULL) {
duke@0 901 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'",
duke@0 902 C->log()->identify(klass),
duke@0 903 C->log()->identify(cha_monomorphic_target));
duke@0 904 }
duke@0 905 cha_monomorphic_target = NULL;
duke@0 906 }
duke@0 907 }
duke@0 908 if (cha_monomorphic_target != NULL) {
duke@0 909 // Hardwiring a virtual.
duke@0 910 // If we inlined because CHA revealed only a single target method,
duke@0 911 // then we are dependent on that target method not getting overridden
duke@0 912 // by dynamic class loading. Be sure to test the "static" receiver
duke@0 913 // dest_method here, as opposed to the actual receiver, which may
duke@0 914 // falsely lead us to believe that the receiver is final or private.
duke@0 915 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target);
duke@0 916 return cha_monomorphic_target;
duke@0 917 }
duke@0 918
duke@0 919 // If the type is exact, we can still bind the method w/o a vcall.
duke@0 920 // (This case comes after CHA so we can see how much extra work it does.)
duke@0 921 if (actual_receiver_is_exact) {
duke@0 922 // In case of evolution, there is a dependence on every inlined method, since each
duke@0 923 // such method can be changed when its class is redefined.
duke@0 924 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver);
duke@0 925 if (exact_method != NULL) {
duke@0 926 #ifndef PRODUCT
duke@0 927 if (PrintOpto) {
duke@0 928 tty->print(" Calling method via exact type @%d --- ", bci);
duke@0 929 exact_method->print_name();
duke@0 930 tty->cr();
duke@0 931 }
duke@0 932 #endif
duke@0 933 return exact_method;
duke@0 934 }
duke@0 935 }
duke@0 936
duke@0 937 return NULL;
duke@0 938 }