Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 7478:5698813d45eb
8005418: JSR 292: virtual dispatch bug in 292 impl
Reviewed-by: jrose, kvn
| author | twisti |
|---|---|
| date | Wed, 09 Jan 2013 15:37:23 -0800 |
| parents | d092d1b31229 |
| children | f1de9dbc914e |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "ci/ciCallSite.hpp" | |
| 27 #include "ci/ciMethodHandle.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
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29 #include "compiler/compileBroker.hpp" |
| 1972 | 30 #include "compiler/compileLog.hpp" |
| 31 #include "interpreter/linkResolver.hpp" | |
| 32 #include "opto/addnode.hpp" | |
| 33 #include "opto/callGenerator.hpp" | |
| 34 #include "opto/cfgnode.hpp" | |
| 35 #include "opto/mulnode.hpp" | |
| 36 #include "opto/parse.hpp" | |
| 37 #include "opto/rootnode.hpp" | |
| 38 #include "opto/runtime.hpp" | |
| 39 #include "opto/subnode.hpp" | |
| 40 #include "prims/nativeLookup.hpp" | |
| 41 #include "runtime/sharedRuntime.hpp" | |
| 0 | 42 |
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43 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) { |
| 6793 | 44 if (TraceTypeProfile || PrintInlining NOT_PRODUCT(|| PrintOptoInlining)) { |
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45 outputStream* out = tty; |
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46 if (!PrintInlining) { |
| 6793 | 47 if (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) { |
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48 method->print_short_name(); |
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49 tty->cr(); |
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50 } |
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51 CompileTask::print_inlining(prof_method, depth, bci); |
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52 } else { |
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53 out = C->print_inlining_stream(); |
| 0 | 54 } |
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55 CompileTask::print_inline_indent(depth, out); |
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56 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); |
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57 stringStream ss; |
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58 prof_klass->name()->print_symbol_on(&ss); |
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59 out->print(ss.as_string()); |
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60 out->cr(); |
| 0 | 61 } |
| 62 } | |
| 63 | |
| 7478 | 64 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch, |
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65 JVMState* jvms, bool allow_inline, |
| 7473 | 66 float prof_factor, bool allow_intrinsics, bool delayed_forbidden) { |
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67 ciMethod* caller = jvms->method(); |
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68 int bci = jvms->bci(); |
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69 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); |
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70 guarantee(callee != NULL, "failed method resolution"); |
| 0 | 71 |
| 72 // Dtrace currently doesn't work unless all calls are vanilla | |
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73 if (env()->dtrace_method_probes()) { |
| 0 | 74 allow_inline = false; |
| 75 } | |
| 76 | |
| 77 // Note: When we get profiling during stage-1 compiles, we want to pull | |
| 78 // from more specific profile data which pertains to this inlining. | |
| 79 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
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80 ciCallProfile profile = caller->call_profile_at_bci(bci); |
| 0 | 81 |
| 82 // See how many times this site has been invoked. | |
| 83 int site_count = profile.count(); | |
| 84 int receiver_count = -1; | |
| 7478 | 85 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) { |
| 0 | 86 // Receivers in the profile structure are ordered by call counts |
| 87 // so that the most called (major) receiver is profile.receiver(0). | |
| 88 receiver_count = profile.receiver_count(0); | |
| 89 } | |
| 90 | |
| 91 CompileLog* log = this->log(); | |
| 92 if (log != NULL) { | |
| 93 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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94 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
| 0 | 95 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
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96 log->identify(callee), site_count, prof_factor); |
| 7478 | 97 if (call_does_dispatch) log->print(" virtual='1'"); |
| 0 | 98 if (allow_inline) log->print(" inline='1'"); |
| 99 if (receiver_count >= 0) { | |
| 100 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
| 101 if (profile.has_receiver(1)) { | |
| 102 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
| 103 } | |
| 104 } | |
| 105 log->end_elem(); | |
| 106 } | |
| 107 | |
| 108 // Special case the handling of certain common, profitable library | |
| 109 // methods. If these methods are replaced with specialized code, | |
| 110 // then we return it as the inlined version of the call. | |
| 111 // We do this before the strict f.p. check below because the | |
| 112 // intrinsics handle strict f.p. correctly. | |
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113 if (allow_inline && allow_intrinsics) { |
| 7478 | 114 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch); |
| 6894 | 115 if (cg != NULL) { |
| 116 if (cg->is_predicted()) { | |
| 117 // Code without intrinsic but, hopefully, inlined. | |
| 118 CallGenerator* inline_cg = this->call_generator(callee, | |
| 7478 | 119 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, false); |
| 6894 | 120 if (inline_cg != NULL) { |
| 121 cg = CallGenerator::for_predicted_intrinsic(cg, inline_cg); | |
| 122 } | |
| 123 } | |
| 124 return cg; | |
| 125 } | |
| 0 | 126 } |
| 127 | |
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128 // Do method handle calls. |
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129 // NOTE: This must happen before normal inlining logic below since |
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130 // MethodHandle.invoke* are native methods which obviously don't |
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131 // have bytecodes and so normal inlining fails. |
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132 if (callee->is_method_handle_intrinsic()) { |
| 7473 | 133 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden); |
| 7478 | 134 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator"); |
| 7473 | 135 return cg; |
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136 } |
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137 |
| 0 | 138 // Do not inline strict fp into non-strict code, or the reverse |
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139 if (caller->is_strict() ^ callee->is_strict()) { |
| 0 | 140 allow_inline = false; |
| 141 } | |
| 142 | |
| 143 // Attempt to inline... | |
| 144 if (allow_inline) { | |
| 145 // The profile data is only partly attributable to this caller, | |
| 146 // scale back the call site information. | |
| 147 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
| 148 // This is the number of times we expect the call code to be used. | |
| 149 float expected_uses = past_uses; | |
| 150 | |
| 151 // Try inlining a bytecoded method: | |
| 7478 | 152 if (!call_does_dispatch) { |
| 0 | 153 InlineTree* ilt; |
| 154 if (UseOldInlining) { | |
| 155 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
| 156 } else { | |
| 157 // Make a disembodied, stateless ILT. | |
| 158 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
| 159 float site_invoke_ratio = prof_factor; | |
| 160 // Note: ilt is for the root of this parse, not the present call site. | |
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161 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel); |
| 0 | 162 } |
| 163 WarmCallInfo scratch_ci; | |
| 164 if (!UseOldInlining) | |
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165 scratch_ci.init(jvms, callee, profile, prof_factor); |
| 7473 | 166 bool should_delay = false; |
| 167 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay); | |
| 0 | 168 assert(ci != &scratch_ci, "do not let this pointer escape"); |
| 169 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
| 170 bool require_inline = (allow_inline && ci->is_hot()); | |
| 171 | |
| 172 if (allow_inline) { | |
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173 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses); |
| 7473 | 174 |
| 175 if (require_inline && cg != NULL) { | |
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176 // Delay the inlining of this method to give us the |
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177 // opportunity to perform some high level optimizations |
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178 // first. |
| 7473 | 179 if (should_delay_inlining(callee, jvms)) { |
| 180 assert(!delayed_forbidden, "strange"); | |
| 181 return CallGenerator::for_string_late_inline(callee, cg); | |
| 182 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) { | |
| 183 return CallGenerator::for_late_inline(callee, cg); | |
| 184 } | |
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185 } |
| 7473 | 186 if (cg == NULL || should_delay) { |
| 0 | 187 // Fall through. |
| 188 } else if (require_inline || !InlineWarmCalls) { | |
| 189 return cg; | |
| 190 } else { | |
| 7478 | 191 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor); |
| 0 | 192 return CallGenerator::for_warm_call(ci, cold_cg, cg); |
| 193 } | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 // Try using the type profile. | |
| 7478 | 198 if (call_does_dispatch && site_count > 0 && receiver_count > 0) { |
| 0 | 199 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. |
| 200 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
| 201 ciMethod* receiver_method = NULL; | |
| 202 if (have_major_receiver || profile.morphism() == 1 || | |
| 203 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
| 204 // receiver_method = profile.method(); | |
| 205 // Profiles do not suggest methods now. Look it up in the major receiver. | |
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206 receiver_method = callee->resolve_invoke(jvms->method()->holder(), |
| 0 | 207 profile.receiver(0)); |
| 208 } | |
| 209 if (receiver_method != NULL) { | |
| 210 // The single majority receiver sufficiently outweighs the minority. | |
| 211 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
| 7478 | 212 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor); |
| 0 | 213 if (hit_cg != NULL) { |
| 214 // Look up second receiver. | |
| 215 CallGenerator* next_hit_cg = NULL; | |
| 216 ciMethod* next_receiver_method = NULL; | |
| 217 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
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218 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(), |
| 0 | 219 profile.receiver(1)); |
| 220 if (next_receiver_method != NULL) { | |
| 221 next_hit_cg = this->call_generator(next_receiver_method, | |
| 7478 | 222 vtable_index, !call_does_dispatch, jvms, |
| 0 | 223 allow_inline, prof_factor); |
| 224 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
| 225 have_major_receiver && UseOnlyInlinedBimorphic) { | |
| 226 // Skip if we can't inline second receiver's method | |
| 227 next_hit_cg = NULL; | |
| 228 } | |
| 229 } | |
| 230 } | |
| 231 CallGenerator* miss_cg; | |
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232 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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233 Deoptimization::Reason_bimorphic : |
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234 Deoptimization::Reason_class_check; |
| 0 | 235 if (( profile.morphism() == 1 || |
| 236 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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237 !too_many_traps(jvms->method(), jvms->bci(), reason) |
| 0 | 238 ) { |
| 239 // Generate uncommon trap for class check failure path | |
| 240 // in case of monomorphic or bimorphic virtual call site. | |
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241 miss_cg = CallGenerator::for_uncommon_trap(callee, reason, |
| 0 | 242 Deoptimization::Action_maybe_recompile); |
| 243 } else { | |
| 244 // Generate virtual call for class check failure path | |
| 245 // in case of polymorphic virtual call site. | |
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246 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index); |
| 0 | 247 } |
| 248 if (miss_cg != NULL) { | |
| 249 if (next_hit_cg != NULL) { | |
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250 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)); |
| 0 | 251 // We don't need to record dependency on a receiver here and below. |
| 252 // Whenever we inline, the dependency is added by Parse::Parse(). | |
| 253 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
| 254 } | |
| 255 if (miss_cg != NULL) { | |
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256 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count); |
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257 CallGenerator* cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
| 0 | 258 if (cg != NULL) return cg; |
| 259 } | |
| 260 } | |
| 261 } | |
| 262 } | |
| 263 } | |
| 264 } | |
| 265 | |
| 266 // There was no special inlining tactic, or it bailed out. | |
| 267 // Use a more generic tactic, like a simple call. | |
| 7478 | 268 if (call_does_dispatch) { |
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269 return CallGenerator::for_virtual_call(callee, vtable_index); |
| 0 | 270 } else { |
| 271 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
| 272 // or it is a static or special call. | |
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273 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms)); |
| 0 | 274 } |
| 275 } | |
| 276 | |
|
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277 // Return true for methods that shouldn't be inlined early so that |
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278 // they are easier to analyze and optimize as intrinsics. |
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279 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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280 if (has_stringbuilder()) { |
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281 |
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282 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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283 call_method->holder() == C->env()->StringBuffer_klass()) && |
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284 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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285 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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286 // Delay SB calls only when called from non-SB code |
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287 return false; |
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288 } |
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289 |
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290 switch (call_method->intrinsic_id()) { |
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291 case vmIntrinsics::_StringBuilder_void: |
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292 case vmIntrinsics::_StringBuilder_int: |
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293 case vmIntrinsics::_StringBuilder_String: |
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294 case vmIntrinsics::_StringBuilder_append_char: |
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295 case vmIntrinsics::_StringBuilder_append_int: |
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296 case vmIntrinsics::_StringBuilder_append_String: |
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297 case vmIntrinsics::_StringBuilder_toString: |
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298 case vmIntrinsics::_StringBuffer_void: |
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299 case vmIntrinsics::_StringBuffer_int: |
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300 case vmIntrinsics::_StringBuffer_String: |
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301 case vmIntrinsics::_StringBuffer_append_char: |
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302 case vmIntrinsics::_StringBuffer_append_int: |
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303 case vmIntrinsics::_StringBuffer_append_String: |
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304 case vmIntrinsics::_StringBuffer_toString: |
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305 case vmIntrinsics::_Integer_toString: |
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306 return true; |
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307 |
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308 case vmIntrinsics::_String_String: |
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309 { |
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310 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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311 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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312 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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313 ciMethod* m = csj->method(); |
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314 if (m != NULL && |
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315 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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316 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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317 // Delay String.<init>(new SB()) |
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318 return true; |
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319 } |
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320 return false; |
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321 } |
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322 |
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323 default: |
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324 return false; |
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325 } |
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326 } |
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327 return false; |
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328 } |
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329 |
| 0 | 330 |
| 331 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
| 332 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
| 333 // Additional inputs to consider... | |
| 334 // bc = bc() | |
| 335 // caller = method() | |
| 336 // iter().get_method_holder_index() | |
| 337 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
| 338 // Interface classes can be loaded & linked and never get around to | |
| 339 // being initialized. Uncommon-trap for not-initialized static or | |
| 340 // v-calls. Let interface calls happen. | |
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341 ciInstanceKlass* holder_klass = dest_method->holder(); |
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342 if (!holder_klass->is_being_initialized() && |
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343 !holder_klass->is_initialized() && |
| 0 | 344 !holder_klass->is_interface()) { |
| 345 uncommon_trap(Deoptimization::Reason_uninitialized, | |
| 346 Deoptimization::Action_reinterpret, | |
| 347 holder_klass); | |
| 348 return true; | |
| 349 } | |
| 350 | |
| 6973 | 351 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility"); |
| 0 | 352 return false; |
| 353 } | |
| 354 | |
| 355 | |
| 356 //------------------------------do_call---------------------------------------- | |
| 357 // Handle your basic call. Inline if we can & want to, else just setup call. | |
| 358 void Parse::do_call() { | |
| 359 // It's likely we are going to add debug info soon. | |
| 360 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
| 361 // our contribution to it is cleaned up right here. | |
| 362 kill_dead_locals(); | |
| 363 | |
| 364 // Set frequently used booleans | |
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365 const bool is_virtual = bc() == Bytecodes::_invokevirtual; |
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366 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; |
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367 const bool has_receiver = Bytecodes::has_receiver(bc()); |
| 0 | 368 |
| 369 // Find target being called | |
| 370 bool will_link; | |
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371 ciSignature* declared_signature = NULL; |
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372 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode |
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373 ciInstanceKlass* holder_klass = orig_callee->holder(); |
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374 ciKlass* holder = iter().get_declared_method_holder(); |
| 0 | 375 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); |
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376 assert(declared_signature != NULL, "cannot be null"); |
| 0 | 377 |
| 378 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
| 379 // bailout when too many arguments for register representation | |
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380 if (!will_link || can_not_compile_call_site(orig_callee, klass)) { |
| 0 | 381 #ifndef PRODUCT |
| 382 if (PrintOpto && (Verbose || WizardMode)) { | |
| 383 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
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384 orig_callee->print_name(); tty->cr(); |
| 0 | 385 } |
| 386 #endif | |
| 387 return; | |
| 388 } | |
| 389 assert(holder_klass->is_loaded(), ""); | |
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390 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw) |
| 0 | 391 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
| 392 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
| 393 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
| 394 // Note: In the absence of miranda methods, an abstract class K can perform | |
| 395 // an invokevirtual directly on an interface method I.m if K implements I. | |
| 396 | |
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397 // orig_callee is the resolved callee which's signature includes the |
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398 // appendix argument. |
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399 const int nargs = orig_callee->arg_size(); |
| 7478 | 400 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id()); |
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401 |
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402 // Push appendix argument (MethodType, CallSite, etc.), if one. |
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403 if (iter().has_appendix()) { |
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404 ciObject* appendix_arg = iter().get_appendix(); |
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405 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg); |
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406 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type); |
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407 push(appendix_arg_node); |
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408 } |
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409 |
| 0 | 410 // --------------------- |
| 411 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
| 412 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
| 413 // Does the call-site type profile reveal only one receiver? | |
| 414 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
| 415 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
| 416 | |
| 7478 | 417 // Try to get the most accurate receiver type |
| 418 ciMethod* callee = orig_callee; | |
| 419 int vtable_index = Method::invalid_vtable_index; | |
| 420 bool call_does_dispatch = false; | |
| 0 | 421 |
| 422 if (is_virtual_or_interface) { | |
| 423 Node* receiver_node = stack(sp() - nargs); | |
| 424 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
| 7478 | 425 // call_does_dispatch and vtable_index are out-parameters. They might be changed. |
| 426 callee = C->optimize_virtual_call(method(), bci(), klass, orig_callee, receiver_type, | |
| 427 is_virtual, | |
| 428 call_does_dispatch, vtable_index); // out-parameters | |
| 0 | 429 } |
| 430 | |
| 431 // Note: It's OK to try to inline a virtual call. | |
| 432 // The call generator will not attempt to inline a polymorphic call | |
| 433 // unless it knows how to optimize the receiver dispatch. | |
| 434 bool try_inline = (C->do_inlining() || InlineAccessors); | |
| 435 | |
| 436 // --------------------- | |
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437 dec_sp(nargs); // Temporarily pop args for JVM state of call |
| 0 | 438 JVMState* jvms = sync_jvms(); |
| 439 | |
| 440 // --------------------- | |
| 441 // Decide call tactic. | |
| 442 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
| 443 // It decides whether inlining is desirable or not. | |
| 7478 | 444 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor()); |
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445 |
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446 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead. |
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447 orig_callee = callee = NULL; |
| 0 | 448 |
| 449 // --------------------- | |
| 450 // Round double arguments before call | |
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451 round_double_arguments(cg->method()); |
| 0 | 452 |
| 453 #ifndef PRODUCT | |
| 454 // bump global counters for calls | |
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455 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline()); |
| 0 | 456 |
| 457 // Record first part of parsing work for this call | |
| 458 parse_histogram()->record_change(); | |
| 459 #endif // not PRODUCT | |
| 460 | |
| 461 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
| 462 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
| 463 | |
| 464 // save across call, for a subsequent cast_not_null. | |
| 465 Node* receiver = has_receiver ? argument(0) : NULL; | |
| 466 | |
| 467 // Bump method data counters (We profile *before* the call is made | |
| 468 // because exceptions don't return to the call site.) | |
| 469 profile_call(receiver); | |
| 470 | |
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471 JVMState* new_jvms = cg->generate(jvms); |
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472 if (new_jvms == NULL) { |
| 0 | 473 // When inlining attempt fails (e.g., too many arguments), |
| 474 // it may contaminate the current compile state, making it | |
| 475 // impossible to pull back and try again. Once we call | |
| 476 // cg->generate(), we are committed. If it fails, the whole | |
| 477 // compilation task is compromised. | |
| 478 if (failing()) return; | |
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479 |
| 0 | 480 // This can happen if a library intrinsic is available, but refuses |
| 481 // the call site, perhaps because it did not match a pattern the | |
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482 // intrinsic was expecting to optimize. Should always be possible to |
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483 // get a normal java call that may inline in that case |
| 7478 | 484 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), /* allow_intrinsics= */ false); |
| 0 | 485 if ((new_jvms = cg->generate(jvms)) == NULL) { |
| 486 guarantee(failing(), "call failed to generate: calls should work"); | |
| 487 return; | |
| 488 } | |
| 489 } | |
| 490 | |
| 491 if (cg->is_inline()) { | |
| 67 | 492 // Accumulate has_loops estimate |
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493 C->set_has_loops(C->has_loops() || cg->method()->has_loops()); |
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494 C->env()->notice_inlined_method(cg->method()); |
| 0 | 495 } |
| 496 | |
| 497 // Reset parser state from [new_]jvms, which now carries results of the call. | |
| 498 // Return value (if any) is already pushed on the stack by the cg. | |
| 499 add_exception_states_from(new_jvms); | |
| 500 if (new_jvms->map()->control() == top()) { | |
| 501 stop_and_kill_map(); | |
| 502 } else { | |
| 503 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
| 504 set_jvms(new_jvms); | |
| 505 } | |
| 506 | |
| 507 if (!stopped()) { | |
| 508 // This was some sort of virtual call, which did a null check for us. | |
| 509 // Now we can assert receiver-not-null, on the normal return path. | |
| 510 if (receiver != NULL && cg->is_virtual()) { | |
| 511 Node* cast = cast_not_null(receiver); | |
| 512 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
| 513 } | |
| 514 | |
| 515 // Round double result after a call from strict to non-strict code | |
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516 round_double_result(cg->method()); |
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517 |
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518 ciType* rtype = cg->method()->return_type(); |
| 7478 | 519 ciType* ctype = declared_signature->return_type(); |
| 520 | |
| 521 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) { | |
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522 // Be careful here with return types. |
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523 if (ctype != rtype) { |
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524 BasicType rt = rtype->basic_type(); |
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525 BasicType ct = ctype->basic_type(); |
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526 if (ct == T_VOID) { |
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527 // It's OK for a method to return a value that is discarded. |
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528 // The discarding does not require any special action from the caller. |
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529 // The Java code knows this, at VerifyType.isNullConversion. |
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530 pop_node(rt); // whatever it was, pop it |
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531 } else if (rt == T_INT || is_subword_type(rt)) { |
| 7478 | 532 // Nothing. These cases are handled in lambda form bytecode. |
| 533 assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct))); | |
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534 } else if (rt == T_OBJECT || rt == T_ARRAY) { |
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535 assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct))); |
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536 if (ctype->is_loaded()) { |
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537 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass()); |
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538 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass()); |
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539 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) { |
| 7478 | 540 Node* retnode = pop(); |
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541 Node* cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), retnode, sig_type)); |
|
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542 push(cast_obj); |
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543 } |
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544 } |
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545 } else { |
| 7478 | 546 assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct))); |
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547 // push a zero; it's better than getting an oop/int mismatch |
| 7478 | 548 pop_node(rt); |
| 549 Node* retnode = zerocon(ct); | |
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550 push_node(ct, retnode); |
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551 } |
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552 // Now that the value is well-behaved, continue with the call-site type. |
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553 rtype = ctype; |
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554 } |
| 7478 | 555 } else { |
| 556 assert(rtype == ctype, "mismatched return types"); // symbolic resolution enforces this | |
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557 } |
| 0 | 558 |
| 559 // If the return type of the method is not loaded, assert that the | |
| 560 // value we got is a null. Otherwise, we need to recompile. | |
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561 if (!rtype->is_loaded()) { |
| 0 | 562 #ifndef PRODUCT |
| 563 if (PrintOpto && (Verbose || WizardMode)) { | |
| 564 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
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565 cg->method()->print_name(); tty->cr(); |
| 0 | 566 } |
| 567 #endif | |
| 568 if (C->log() != NULL) { | |
| 569 C->log()->elem("assert_null reason='return' klass='%d'", | |
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570 C->log()->identify(rtype)); |
| 0 | 571 } |
| 572 // If there is going to be a trap, put it at the next bytecode: | |
| 573 set_bci(iter().next_bci()); | |
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574 null_assert(peek()); |
| 0 | 575 set_bci(iter().cur_bci()); // put it back |
| 576 } | |
| 577 } | |
| 578 | |
| 579 // Restart record of parsing work after possible inlining of call | |
| 580 #ifndef PRODUCT | |
| 581 parse_histogram()->set_initial_state(bc()); | |
| 582 #endif | |
| 583 } | |
| 584 | |
| 585 //---------------------------catch_call_exceptions----------------------------- | |
| 586 // Put a Catch and CatchProj nodes behind a just-created call. | |
| 587 // Send their caught exceptions to the proper handler. | |
| 588 // This may be used after a call to the rethrow VM stub, | |
| 589 // when it is needed to process unloaded exception classes. | |
| 590 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
| 591 // Exceptions are delivered through this channel: | |
| 592 Node* i_o = this->i_o(); | |
| 593 | |
| 594 // Add a CatchNode. | |
| 595 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
| 596 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
| 597 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
| 598 | |
| 599 for (; !handlers.is_done(); handlers.next()) { | |
| 600 ciExceptionHandler* h = handlers.handler(); | |
| 601 int h_bci = h->handler_bci(); | |
| 602 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
| 603 // Do not introduce unloaded exception types into the graph: | |
| 604 if (!h_klass->is_loaded()) { | |
| 605 if (saw_unloaded->contains(h_bci)) { | |
| 606 /* We've already seen an unloaded exception with h_bci, | |
| 607 so don't duplicate. Duplication will cause the CatchNode to be | |
| 608 unnecessarily large. See 4713716. */ | |
| 609 continue; | |
| 610 } else { | |
| 611 saw_unloaded->append(h_bci); | |
| 612 } | |
| 613 } | |
| 614 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
| 615 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
| 616 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
| 617 assert(!h_extype->empty(), "sanity"); | |
| 618 // Note: It's OK if the BCIs repeat themselves. | |
| 619 bcis->append(h_bci); | |
| 620 extypes->append(h_extype); | |
| 621 } | |
| 622 | |
| 623 int len = bcis->length(); | |
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624 CatchNode *cn = new (C) CatchNode(control(), i_o, len+1); |
| 0 | 625 Node *catch_ = _gvn.transform(cn); |
| 626 | |
| 627 // now branch with the exception state to each of the (potential) | |
| 628 // handlers | |
| 629 for(int i=0; i < len; i++) { | |
| 630 // Setup JVM state to enter the handler. | |
| 631 PreserveJVMState pjvms(this); | |
| 632 // Locals are just copied from before the call. | |
| 633 // Get control from the CatchNode. | |
| 634 int handler_bci = bcis->at(i); | |
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635 Node* ctrl = _gvn.transform( new (C) CatchProjNode(catch_, i+1,handler_bci)); |
| 0 | 636 // This handler cannot happen? |
| 637 if (ctrl == top()) continue; | |
| 638 set_control(ctrl); | |
| 639 | |
| 640 // Create exception oop | |
| 641 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
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642 Node *ex_oop = _gvn.transform(new (C) CreateExNode(extypes->at(i), ctrl, i_o)); |
| 0 | 643 |
| 644 // Handle unloaded exception classes. | |
| 645 if (saw_unloaded->contains(handler_bci)) { | |
| 646 // An unloaded exception type is coming here. Do an uncommon trap. | |
| 647 #ifndef PRODUCT | |
| 648 // We do not expect the same handler bci to take both cold unloaded | |
| 649 // and hot loaded exceptions. But, watch for it. | |
|
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650 if ((Verbose || WizardMode) && extype->is_loaded()) { |
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651 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci()); |
| 0 | 652 method()->print_name(); tty->cr(); |
| 653 } else if (PrintOpto && (Verbose || WizardMode)) { | |
| 654 tty->print("Bailing out on unloaded exception type "); | |
| 655 extype->klass()->print_name(); | |
| 656 tty->print(" at bci:%d in ", bci()); | |
| 657 method()->print_name(); tty->cr(); | |
| 658 } | |
| 659 #endif | |
| 660 // Emit an uncommon trap instead of processing the block. | |
| 661 set_bci(handler_bci); | |
| 662 push_ex_oop(ex_oop); | |
| 663 uncommon_trap(Deoptimization::Reason_unloaded, | |
| 664 Deoptimization::Action_reinterpret, | |
| 665 extype->klass(), "!loaded exception"); | |
| 666 set_bci(iter().cur_bci()); // put it back | |
| 667 continue; | |
| 668 } | |
| 669 | |
| 670 // go to the exception handler | |
| 671 if (handler_bci < 0) { // merge with corresponding rethrow node | |
| 672 throw_to_exit(make_exception_state(ex_oop)); | |
| 673 } else { // Else jump to corresponding handle | |
| 674 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
| 675 merge_exception(handler_bci); | |
| 676 } | |
| 677 } | |
| 678 | |
| 679 // The first CatchProj is for the normal return. | |
| 680 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
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681 set_control(_gvn.transform( new (C) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); |
| 0 | 682 } |
| 683 | |
| 684 | |
| 685 //----------------------------catch_inline_exceptions-------------------------- | |
| 686 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
| 687 // Common case 1: we have no handler, so all exceptions merge right into | |
| 688 // the rethrow case. | |
| 689 // Case 2: we have some handlers, with loaded exception klasses that have | |
| 690 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
| 691 // exception oop and branch to the handler directly. | |
| 692 // Case 3: We have some handlers with subklasses or are not loaded at | |
| 693 // compile-time. We have to call the runtime to resolve the exception. | |
| 694 // So we insert a RethrowCall and all the logic that goes with it. | |
| 695 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
| 696 // Caller is responsible for saving away the map for normal control flow! | |
| 697 assert(stopped(), "call set_map(NULL) first"); | |
| 698 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
| 699 | |
| 700 Node* ex_node = saved_ex_oop(ex_map); | |
| 701 if (ex_node == top()) { | |
| 702 // No action needed. | |
| 703 return; | |
| 704 } | |
| 705 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
| 706 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
| 707 if (ex_type == NULL) | |
| 708 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
| 709 | |
| 710 // determine potential exception handlers | |
| 711 ciExceptionHandlerStream handlers(method(), bci(), | |
| 712 ex_type->klass()->as_instance_klass(), | |
| 713 ex_type->klass_is_exact()); | |
| 714 | |
| 715 // Start executing from the given throw state. (Keep its stack, for now.) | |
| 716 // Get the exception oop as known at compile time. | |
| 717 ex_node = use_exception_state(ex_map); | |
| 718 | |
| 719 // Get the exception oop klass from its header | |
| 720 Node* ex_klass_node = NULL; | |
| 721 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
| 722 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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723 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
| 0 | 724 |
| 725 // Compute the exception klass a little more cleverly. | |
| 726 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
| 727 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
| 728 // each arm of the Phi. If I know something clever about the exceptions | |
| 729 // I'm loading the class from, I can replace the LoadKlass with the | |
| 730 // klass constant for the exception oop. | |
| 731 if( ex_node->is_Phi() ) { | |
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732 ex_klass_node = new (C) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); |
| 0 | 733 for( uint i = 1; i < ex_node->req(); i++ ) { |
| 734 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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735 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
| 0 | 736 ex_klass_node->init_req( i, k ); |
| 737 } | |
| 738 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
| 739 | |
| 740 } | |
| 741 } | |
| 742 | |
| 743 // Scan the exception table for applicable handlers. | |
| 744 // If none, we can call rethrow() and be done! | |
| 745 // If precise (loaded with no subklasses), insert a D.S. style | |
| 746 // pointer compare to the correct handler and loop back. | |
| 747 // If imprecise, switch to the Rethrow VM-call style handling. | |
| 748 | |
| 749 int remaining = handlers.count_remaining(); | |
| 750 | |
| 751 // iterate through all entries sequentially | |
| 752 for (;!handlers.is_done(); handlers.next()) { | |
| 753 ciExceptionHandler* handler = handlers.handler(); | |
| 754 | |
| 755 if (handler->is_rethrow()) { | |
| 756 // If we fell off the end of the table without finding an imprecise | |
| 757 // exception klass (and without finding a generic handler) then we | |
| 758 // know this exception is not handled in this method. We just rethrow | |
| 759 // the exception into the caller. | |
| 760 throw_to_exit(make_exception_state(ex_node)); | |
| 761 return; | |
| 762 } | |
| 763 | |
| 764 // exception handler bci range covers throw_bci => investigate further | |
| 765 int handler_bci = handler->handler_bci(); | |
| 766 | |
| 767 if (remaining == 1) { | |
| 768 push_ex_oop(ex_node); // Push exception oop for handler | |
| 769 #ifndef PRODUCT | |
| 770 if (PrintOpto && WizardMode) { | |
| 771 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
| 772 } | |
| 773 #endif | |
| 774 merge_exception(handler_bci); // jump to handler | |
| 775 return; // No more handling to be done here! | |
| 776 } | |
| 777 | |
| 1344 | 778 // Get the handler's klass |
| 0 | 779 ciInstanceKlass* klass = handler->catch_klass(); |
| 1344 | 780 |
| 781 if (!klass->is_loaded()) { // klass is not loaded? | |
| 782 // fall through into catch_call_exceptions which will emit a | |
| 783 // handler with an uncommon trap. | |
| 784 break; | |
| 0 | 785 } |
| 786 | |
| 787 if (klass->is_interface()) // should not happen, but... | |
| 788 break; // bail out | |
| 789 | |
| 1344 | 790 // Check the type of the exception against the catch type |
| 0 | 791 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
| 792 Node* con = _gvn.makecon(tk); | |
| 1344 | 793 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
| 794 if (!stopped()) { | |
| 795 PreserveJVMState pjvms(this); | |
| 796 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
| 797 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
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798 Node* ex_oop = _gvn.transform(new (C) CheckCastPPNode(control(), ex_node, tinst)); |
| 0 | 799 push_ex_oop(ex_oop); // Push exception oop for handler |
| 800 #ifndef PRODUCT | |
| 801 if (PrintOpto && WizardMode) { | |
| 802 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
| 803 klass->print_name(); | |
| 804 tty->cr(); | |
| 805 } | |
| 806 #endif | |
| 807 merge_exception(handler_bci); | |
| 808 } | |
| 1344 | 809 set_control(not_subtype_ctrl); |
| 0 | 810 |
| 811 // Come here if exception does not match handler. | |
| 812 // Carry on with more handler checks. | |
| 813 --remaining; | |
| 814 } | |
| 815 | |
| 816 assert(!stopped(), "you should return if you finish the chain"); | |
| 817 | |
| 818 // Oops, need to call into the VM to resolve the klasses at runtime. | |
| 819 // Note: This call must not deoptimize, since it is not a real at this bci! | |
| 820 kill_dead_locals(); | |
| 821 | |
| 822 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
| 823 OptoRuntime::rethrow_Type(), | |
| 824 OptoRuntime::rethrow_stub(), | |
| 825 NULL, NULL, | |
| 826 ex_node); | |
| 827 | |
| 828 // Rethrow is a pure call, no side effects, only a result. | |
| 829 // The result cannot be allocated, so we use I_O | |
| 830 | |
| 831 // Catch exceptions from the rethrow | |
| 832 catch_call_exceptions(handlers); | |
| 833 } | |
| 834 | |
| 835 | |
| 836 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
| 837 | |
| 838 | |
| 839 #ifndef PRODUCT | |
| 840 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
| 841 if( CountCompiledCalls ) { | |
| 842 if( at_method_entry ) { | |
| 843 // bump invocation counter if top method (for statistics) | |
| 844 if (CountCompiledCalls && depth() == 1) { | |
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845 const TypePtr* addr_type = TypeMetadataPtr::make(method()); |
| 0 | 846 Node* adr1 = makecon(addr_type); |
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847 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset())); |
| 0 | 848 increment_counter(adr2); |
| 849 } | |
| 850 } else if (is_inline) { | |
| 851 switch (bc()) { | |
| 852 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
| 853 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
| 854 case Bytecodes::_invokestatic: | |
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855 case Bytecodes::_invokedynamic: |
| 0 | 856 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
| 857 default: fatal("unexpected call bytecode"); | |
| 858 } | |
| 859 } else { | |
| 860 switch (bc()) { | |
| 861 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
| 862 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
| 863 case Bytecodes::_invokestatic: | |
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864 case Bytecodes::_invokedynamic: |
| 0 | 865 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
| 866 default: fatal("unexpected call bytecode"); | |
| 867 } | |
| 868 } | |
| 869 } | |
| 870 } | |
| 871 #endif //PRODUCT | |
| 872 | |
| 873 | |
| 7478 | 874 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass, |
| 875 ciMethod* callee, const TypeOopPtr* receiver_type, | |
| 876 bool is_virtual, | |
| 877 bool& call_does_dispatch, int& vtable_index) { | |
| 878 // Set default values for out-parameters. | |
| 879 call_does_dispatch = true; | |
| 880 vtable_index = Method::invalid_vtable_index; | |
| 881 | |
| 882 // Choose call strategy. | |
| 883 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, receiver_type); | |
| 884 | |
| 885 // Have the call been sufficiently improved such that it is no longer a virtual? | |
| 886 if (optimized_virtual_method != NULL) { | |
| 887 callee = optimized_virtual_method; | |
| 888 call_does_dispatch = false; | |
| 889 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) { | |
| 890 // We can make a vtable call at this site | |
| 891 vtable_index = callee->resolve_vtable_index(caller->holder(), klass); | |
| 892 } | |
| 893 return callee; | |
| 894 } | |
| 895 | |
| 0 | 896 // Identify possible target method and inlining style |
| 7478 | 897 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, |
| 898 ciMethod* callee, const TypeOopPtr* receiver_type) { | |
| 0 | 899 // only use for virtual or interface calls |
| 900 | |
| 901 // If it is obviously final, do not bother to call find_monomorphic_target, | |
| 902 // because the class hierarchy checks are not needed, and may fail due to | |
| 903 // incompletely loaded classes. Since we do our own class loading checks | |
| 904 // in this module, we may confidently bind to any method. | |
| 7478 | 905 if (callee->can_be_statically_bound()) { |
| 906 return callee; | |
| 0 | 907 } |
| 908 | |
| 909 // Attempt to improve the receiver | |
| 910 bool actual_receiver_is_exact = false; | |
| 911 ciInstanceKlass* actual_receiver = klass; | |
| 912 if (receiver_type != NULL) { | |
| 913 // Array methods are all inherited from Object, and are monomorphic. | |
| 914 if (receiver_type->isa_aryptr() && | |
| 7478 | 915 callee->holder() == env()->Object_klass()) { |
| 916 return callee; | |
| 0 | 917 } |
| 918 | |
| 919 // All other interesting cases are instance klasses. | |
| 920 if (!receiver_type->isa_instptr()) { | |
| 921 return NULL; | |
| 922 } | |
| 923 | |
| 924 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
| 925 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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926 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
| 0 | 927 // ikl is a same or better type than the original actual_receiver, |
| 928 // e.g. static receiver from bytecodes. | |
| 929 actual_receiver = ikl; | |
| 930 // Is the actual_receiver exact? | |
| 931 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
| 932 } | |
| 933 } | |
| 934 | |
| 935 ciInstanceKlass* calling_klass = caller->holder(); | |
| 7478 | 936 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver); |
| 0 | 937 if (cha_monomorphic_target != NULL) { |
| 938 assert(!cha_monomorphic_target->is_abstract(), ""); | |
| 939 // Look at the method-receiver type. Does it add "too much information"? | |
| 940 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
| 941 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
| 942 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
| 943 // Calling this method would include an implicit cast to its holder. | |
| 944 // %%% Not yet implemented. Would throw minor asserts at present. | |
| 945 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
| 946 // To fix, put the higher_equal check at the call of this routine, | |
| 947 // and add a CheckCastPP to the receiver. | |
| 948 if (TraceDependencies) { | |
| 949 tty->print_cr("found unique CHA method, but could not cast up"); | |
| 950 tty->print(" method = "); | |
| 951 cha_monomorphic_target->print(); | |
| 952 tty->cr(); | |
| 953 } | |
| 7478 | 954 if (log() != NULL) { |
| 955 log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
| 956 log()->identify(klass), | |
| 957 log()->identify(cha_monomorphic_target)); | |
| 0 | 958 } |
| 959 cha_monomorphic_target = NULL; | |
| 960 } | |
| 961 } | |
| 962 if (cha_monomorphic_target != NULL) { | |
| 963 // Hardwiring a virtual. | |
| 964 // If we inlined because CHA revealed only a single target method, | |
| 965 // then we are dependent on that target method not getting overridden | |
| 966 // by dynamic class loading. Be sure to test the "static" receiver | |
| 967 // dest_method here, as opposed to the actual receiver, which may | |
| 968 // falsely lead us to believe that the receiver is final or private. | |
| 7478 | 969 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); |
| 0 | 970 return cha_monomorphic_target; |
| 971 } | |
| 972 | |
| 973 // If the type is exact, we can still bind the method w/o a vcall. | |
| 974 // (This case comes after CHA so we can see how much extra work it does.) | |
| 975 if (actual_receiver_is_exact) { | |
| 976 // In case of evolution, there is a dependence on every inlined method, since each | |
| 977 // such method can be changed when its class is redefined. | |
| 7478 | 978 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver); |
| 0 | 979 if (exact_method != NULL) { |
| 980 #ifndef PRODUCT | |
| 981 if (PrintOpto) { | |
| 982 tty->print(" Calling method via exact type @%d --- ", bci); | |
| 983 exact_method->print_name(); | |
| 984 tty->cr(); | |
| 985 } | |
| 986 #endif | |
| 987 return exact_method; | |
| 988 } | |
| 989 } | |
| 990 | |
| 991 return NULL; | |
| 992 } |