Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 3901:aa67216400d3
7085404: JSR 292: VolatileCallSites should have push notification too
Reviewed-by: never, kvn
| author | twisti |
|---|---|
| date | Fri, 02 Sep 2011 00:36:18 -0700 |
| parents | fdb992d83a87 |
| children | a04a201f0f5a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2011, 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/ciCPCache.hpp" | |
| 27 #include "ci/ciCallSite.hpp" | |
| 28 #include "ci/ciMethodHandle.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
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30 #include "compiler/compileBroker.hpp" |
| 1972 | 31 #include "compiler/compileLog.hpp" |
| 32 #include "interpreter/linkResolver.hpp" | |
| 33 #include "opto/addnode.hpp" | |
| 34 #include "opto/callGenerator.hpp" | |
| 35 #include "opto/cfgnode.hpp" | |
| 36 #include "opto/mulnode.hpp" | |
| 37 #include "opto/parse.hpp" | |
| 38 #include "opto/rootnode.hpp" | |
| 39 #include "opto/runtime.hpp" | |
| 40 #include "opto/subnode.hpp" | |
| 41 #include "prims/nativeLookup.hpp" | |
| 42 #include "runtime/sharedRuntime.hpp" | |
| 0 | 43 |
| 44 #ifndef PRODUCT | |
| 45 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) { | |
| 46 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) { | |
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47 if (!PrintInlining) { |
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48 if (!PrintOpto && !PrintCompilation) { |
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49 method->print_short_name(); |
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50 tty->cr(); |
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51 } |
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52 CompileTask::print_inlining(prof_method, depth, bci); |
| 0 | 53 } |
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54 CompileTask::print_inline_indent(depth); |
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55 tty->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); |
| 0 | 56 prof_klass->name()->print_symbol(); |
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57 tty->cr(); |
| 0 | 58 } |
| 59 } | |
| 60 #endif | |
| 61 | |
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62 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual, |
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63 JVMState* jvms, bool allow_inline, |
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64 float prof_factor) { |
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65 CallGenerator* cg; |
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66 ciMethod* caller = jvms->method(); |
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67 int bci = jvms->bci(); |
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68 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); |
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69 guarantee(call_method != NULL, "failed method resolution"); |
| 0 | 70 |
| 71 // Dtrace currently doesn't work unless all calls are vanilla | |
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72 if (env()->dtrace_method_probes()) { |
| 0 | 73 allow_inline = false; |
| 74 } | |
| 75 | |
| 76 // Note: When we get profiling during stage-1 compiles, we want to pull | |
| 77 // from more specific profile data which pertains to this inlining. | |
| 78 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
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79 ciCallProfile profile = caller->call_profile_at_bci(bci); |
| 0 | 80 |
| 81 // See how many times this site has been invoked. | |
| 82 int site_count = profile.count(); | |
| 83 int receiver_count = -1; | |
| 84 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) { | |
| 85 // Receivers in the profile structure are ordered by call counts | |
| 86 // so that the most called (major) receiver is profile.receiver(0). | |
| 87 receiver_count = profile.receiver_count(0); | |
| 88 } | |
| 89 | |
| 90 CompileLog* log = this->log(); | |
| 91 if (log != NULL) { | |
| 92 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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93 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
| 0 | 94 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
| 95 log->identify(call_method), site_count, prof_factor); | |
| 96 if (call_is_virtual) log->print(" virtual='1'"); | |
| 97 if (allow_inline) log->print(" inline='1'"); | |
| 98 if (receiver_count >= 0) { | |
| 99 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
| 100 if (profile.has_receiver(1)) { | |
| 101 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
| 102 } | |
| 103 } | |
| 104 log->end_elem(); | |
| 105 } | |
| 106 | |
| 107 // Special case the handling of certain common, profitable library | |
| 108 // methods. If these methods are replaced with specialized code, | |
| 109 // then we return it as the inlined version of the call. | |
| 110 // We do this before the strict f.p. check below because the | |
| 111 // intrinsics handle strict f.p. correctly. | |
| 112 if (allow_inline) { | |
| 113 cg = find_intrinsic(call_method, call_is_virtual); | |
| 114 if (cg != NULL) return cg; | |
| 115 } | |
| 116 | |
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117 // Do method handle calls. |
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118 // NOTE: This must happen before normal inlining logic below since |
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119 // MethodHandle.invoke* are native methods which obviously don't |
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120 // have bytecodes and so normal inlining fails. |
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121 if (call_method->is_method_handle_invoke()) { |
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122 if (bytecode != Bytecodes::_invokedynamic) { |
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123 GraphKit kit(jvms); |
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124 Node* n = kit.argument(0); |
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125 |
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126 CallGenerator* cg = CallGenerator::for_method_handle_inline(n, jvms, caller, call_method, profile); |
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127 if (cg != NULL) { |
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128 return cg; |
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129 } |
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130 return CallGenerator::for_direct_call(call_method); |
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131 } |
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132 else { |
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133 // Get the CallSite object. |
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134 ciMethod* caller_method = jvms->method(); |
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135 ciBytecodeStream str(caller_method); |
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136 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci. |
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137 ciCallSite* call_site = str.get_call_site(); |
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138 |
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139 CallGenerator* cg = CallGenerator::for_invokedynamic_inline(call_site, jvms, caller, call_method, profile); |
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140 if (cg != NULL) { |
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141 return cg; |
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142 } |
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143 // If something failed, generate a normal dynamic call. |
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144 return CallGenerator::for_dynamic_call(call_method); |
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145 } |
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146 } |
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147 |
| 0 | 148 // Do not inline strict fp into non-strict code, or the reverse |
| 149 bool caller_method_is_strict = jvms->method()->is_strict(); | |
| 150 if( caller_method_is_strict ^ call_method->is_strict() ) { | |
| 151 allow_inline = false; | |
| 152 } | |
| 153 | |
| 154 // Attempt to inline... | |
| 155 if (allow_inline) { | |
| 156 // The profile data is only partly attributable to this caller, | |
| 157 // scale back the call site information. | |
| 158 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
| 159 // This is the number of times we expect the call code to be used. | |
| 160 float expected_uses = past_uses; | |
| 161 | |
| 162 // Try inlining a bytecoded method: | |
| 163 if (!call_is_virtual) { | |
| 164 InlineTree* ilt; | |
| 165 if (UseOldInlining) { | |
| 166 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
| 167 } else { | |
| 168 // Make a disembodied, stateless ILT. | |
| 169 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
| 170 float site_invoke_ratio = prof_factor; | |
| 171 // Note: ilt is for the root of this parse, not the present call site. | |
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172 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel); |
| 0 | 173 } |
| 174 WarmCallInfo scratch_ci; | |
| 175 if (!UseOldInlining) | |
| 176 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
| 177 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
| 178 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
| 179 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
| 180 bool require_inline = (allow_inline && ci->is_hot()); | |
| 181 | |
| 182 if (allow_inline) { | |
| 183 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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184 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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185 // Delay the inlining of this method to give us the |
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186 // opportunity to perform some high level optimizations |
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187 // first. |
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188 return CallGenerator::for_late_inline(call_method, cg); |
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189 } |
| 0 | 190 if (cg == NULL) { |
| 191 // Fall through. | |
| 192 } else if (require_inline || !InlineWarmCalls) { | |
| 193 return cg; | |
| 194 } else { | |
| 195 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
| 196 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
| 197 } | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 // Try using the type profile. | |
| 202 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
| 203 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
| 204 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
| 205 ciMethod* receiver_method = NULL; | |
| 206 if (have_major_receiver || profile.morphism() == 1 || | |
| 207 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
| 208 // receiver_method = profile.method(); | |
| 209 // Profiles do not suggest methods now. Look it up in the major receiver. | |
| 210 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
| 211 profile.receiver(0)); | |
| 212 } | |
| 213 if (receiver_method != NULL) { | |
| 214 // The single majority receiver sufficiently outweighs the minority. | |
| 215 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
| 216 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
| 217 if (hit_cg != NULL) { | |
| 218 // Look up second receiver. | |
| 219 CallGenerator* next_hit_cg = NULL; | |
| 220 ciMethod* next_receiver_method = NULL; | |
| 221 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
| 222 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
| 223 profile.receiver(1)); | |
| 224 if (next_receiver_method != NULL) { | |
| 225 next_hit_cg = this->call_generator(next_receiver_method, | |
| 226 vtable_index, !call_is_virtual, jvms, | |
| 227 allow_inline, prof_factor); | |
| 228 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
| 229 have_major_receiver && UseOnlyInlinedBimorphic) { | |
| 230 // Skip if we can't inline second receiver's method | |
| 231 next_hit_cg = NULL; | |
| 232 } | |
| 233 } | |
| 234 } | |
| 235 CallGenerator* miss_cg; | |
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236 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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237 Deoptimization::Reason_bimorphic : |
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238 Deoptimization::Reason_class_check; |
| 0 | 239 if (( profile.morphism() == 1 || |
| 240 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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241 !too_many_traps(jvms->method(), jvms->bci(), reason) |
| 0 | 242 ) { |
| 243 // Generate uncommon trap for class check failure path | |
| 244 // in case of monomorphic or bimorphic virtual call site. | |
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245 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
| 0 | 246 Deoptimization::Action_maybe_recompile); |
| 247 } else { | |
| 248 // Generate virtual call for class check failure path | |
| 249 // in case of polymorphic virtual call site. | |
| 250 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
| 251 } | |
| 252 if (miss_cg != NULL) { | |
| 253 if (next_hit_cg != NULL) { | |
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254 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1))); |
| 0 | 255 // We don't need to record dependency on a receiver here and below. |
| 256 // Whenever we inline, the dependency is added by Parse::Parse(). | |
| 257 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
| 258 } | |
| 259 if (miss_cg != NULL) { | |
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260 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
| 0 | 261 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
| 262 if (cg != NULL) return cg; | |
| 263 } | |
| 264 } | |
| 265 } | |
| 266 } | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 // There was no special inlining tactic, or it bailed out. | |
| 271 // Use a more generic tactic, like a simple call. | |
| 272 if (call_is_virtual) { | |
| 273 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
| 274 } else { | |
| 275 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
| 276 // or it is a static or special call. | |
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277 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
| 0 | 278 } |
| 279 } | |
| 280 | |
|
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281 // Return true for methods that shouldn't be inlined early so that |
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282 // they are easier to analyze and optimize as intrinsics. |
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283 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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284 if (has_stringbuilder()) { |
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285 |
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286 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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287 call_method->holder() == C->env()->StringBuffer_klass()) && |
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288 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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289 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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290 // Delay SB calls only when called from non-SB code |
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291 return false; |
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292 } |
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293 |
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294 switch (call_method->intrinsic_id()) { |
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295 case vmIntrinsics::_StringBuilder_void: |
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296 case vmIntrinsics::_StringBuilder_int: |
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297 case vmIntrinsics::_StringBuilder_String: |
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298 case vmIntrinsics::_StringBuilder_append_char: |
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299 case vmIntrinsics::_StringBuilder_append_int: |
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300 case vmIntrinsics::_StringBuilder_append_String: |
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301 case vmIntrinsics::_StringBuilder_toString: |
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302 case vmIntrinsics::_StringBuffer_void: |
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303 case vmIntrinsics::_StringBuffer_int: |
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304 case vmIntrinsics::_StringBuffer_String: |
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305 case vmIntrinsics::_StringBuffer_append_char: |
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306 case vmIntrinsics::_StringBuffer_append_int: |
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307 case vmIntrinsics::_StringBuffer_append_String: |
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308 case vmIntrinsics::_StringBuffer_toString: |
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309 case vmIntrinsics::_Integer_toString: |
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310 return true; |
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311 |
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312 case vmIntrinsics::_String_String: |
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313 { |
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314 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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315 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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316 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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317 ciMethod* m = csj->method(); |
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318 if (m != NULL && |
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319 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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320 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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321 // Delay String.<init>(new SB()) |
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322 return true; |
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323 } |
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324 return false; |
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325 } |
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326 |
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327 default: |
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328 return false; |
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329 } |
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330 } |
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331 return false; |
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332 } |
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333 |
| 0 | 334 |
| 335 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
| 336 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
| 337 // Additional inputs to consider... | |
| 338 // bc = bc() | |
| 339 // caller = method() | |
| 340 // iter().get_method_holder_index() | |
| 341 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
| 342 // Interface classes can be loaded & linked and never get around to | |
| 343 // being initialized. Uncommon-trap for not-initialized static or | |
| 344 // v-calls. Let interface calls happen. | |
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345 ciInstanceKlass* holder_klass = dest_method->holder(); |
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346 if (!holder_klass->is_being_initialized() && |
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347 !holder_klass->is_initialized() && |
| 0 | 348 !holder_klass->is_interface()) { |
| 349 uncommon_trap(Deoptimization::Reason_uninitialized, | |
| 350 Deoptimization::Action_reinterpret, | |
| 351 holder_klass); | |
| 352 return true; | |
| 353 } | |
| 354 | |
| 355 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
| 356 return false; | |
| 357 } | |
| 358 | |
| 359 | |
| 360 //------------------------------do_call---------------------------------------- | |
| 361 // Handle your basic call. Inline if we can & want to, else just setup call. | |
| 362 void Parse::do_call() { | |
| 363 // It's likely we are going to add debug info soon. | |
| 364 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
| 365 // our contribution to it is cleaned up right here. | |
| 366 kill_dead_locals(); | |
| 367 | |
| 368 // Set frequently used booleans | |
| 369 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
| 370 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
| 371 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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372 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
| 0 | 373 |
| 374 // Find target being called | |
| 375 bool will_link; | |
| 376 ciMethod* dest_method = iter().get_method(will_link); | |
| 377 ciInstanceKlass* holder_klass = dest_method->holder(); | |
| 378 ciKlass* holder = iter().get_declared_method_holder(); | |
| 379 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
| 380 | |
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381 int nargs = dest_method->arg_size(); |
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382 if (is_invokedynamic) nargs -= 1; |
| 0 | 383 |
| 384 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
| 385 // bailout when too many arguments for register representation | |
| 386 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
| 387 #ifndef PRODUCT | |
| 388 if (PrintOpto && (Verbose || WizardMode)) { | |
| 389 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
| 390 dest_method->print_name(); tty->cr(); | |
| 391 } | |
| 392 #endif | |
| 393 return; | |
| 394 } | |
| 395 assert(holder_klass->is_loaded(), ""); | |
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396 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
| 0 | 397 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
| 398 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
| 399 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
| 400 // Note: In the absence of miranda methods, an abstract class K can perform | |
| 401 // an invokevirtual directly on an interface method I.m if K implements I. | |
| 402 | |
| 403 // --------------------- | |
| 404 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
| 405 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
| 406 // Does the call-site type profile reveal only one receiver? | |
| 407 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
| 408 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
| 409 | |
| 410 // Choose call strategy. | |
| 411 bool call_is_virtual = is_virtual_or_interface; | |
| 412 int vtable_index = methodOopDesc::invalid_vtable_index; | |
| 413 ciMethod* call_method = dest_method; | |
| 414 | |
| 415 // Try to get the most accurate receiver type | |
| 416 if (is_virtual_or_interface) { | |
| 417 Node* receiver_node = stack(sp() - nargs); | |
| 418 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
| 419 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
| 420 | |
| 421 // Have the call been sufficiently improved such that it is no longer a virtual? | |
| 422 if (optimized_virtual_method != NULL) { | |
| 423 call_method = optimized_virtual_method; | |
| 424 call_is_virtual = false; | |
| 425 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
| 426 // We can make a vtable call at this site | |
| 427 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
| 428 } | |
| 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 // --------------------- | |
| 437 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
| 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. | |
| 444 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
| 445 | |
| 446 // --------------------- | |
| 447 // Round double arguments before call | |
| 448 round_double_arguments(dest_method); | |
| 449 | |
| 450 #ifndef PRODUCT | |
| 451 // bump global counters for calls | |
| 452 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
| 453 | |
| 454 // Record first part of parsing work for this call | |
| 455 parse_histogram()->record_change(); | |
| 456 #endif // not PRODUCT | |
| 457 | |
| 458 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
| 459 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
| 460 | |
| 461 // save across call, for a subsequent cast_not_null. | |
| 462 Node* receiver = has_receiver ? argument(0) : NULL; | |
| 463 | |
| 464 // Bump method data counters (We profile *before* the call is made | |
| 465 // because exceptions don't return to the call site.) | |
| 466 profile_call(receiver); | |
| 467 | |
| 468 JVMState* new_jvms; | |
| 469 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
| 470 // When inlining attempt fails (e.g., too many arguments), | |
| 471 // it may contaminate the current compile state, making it | |
| 472 // impossible to pull back and try again. Once we call | |
| 473 // cg->generate(), we are committed. If it fails, the whole | |
| 474 // compilation task is compromised. | |
| 475 if (failing()) return; | |
| 476 #ifndef PRODUCT | |
| 477 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
| 478 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
| 479 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
| 480 tty->print("Bailed out of intrinsic, will not inline: "); | |
| 481 call_method->print_name(); tty->cr(); | |
| 482 } | |
| 483 } | |
| 484 #endif | |
| 485 // This can happen if a library intrinsic is available, but refuses | |
| 486 // the call site, perhaps because it did not match a pattern the | |
| 487 // intrinsic was expecting to optimize. The fallback position is | |
| 488 // to call out-of-line. | |
| 489 try_inline = false; // Inline tactic bailed out. | |
| 490 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
| 491 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
| 492 guarantee(failing(), "call failed to generate: calls should work"); | |
| 493 return; | |
| 494 } | |
| 495 } | |
| 496 | |
| 497 if (cg->is_inline()) { | |
| 67 | 498 // Accumulate has_loops estimate |
| 499 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
| 0 | 500 C->env()->notice_inlined_method(call_method); |
| 501 } | |
| 502 | |
| 503 // Reset parser state from [new_]jvms, which now carries results of the call. | |
| 504 // Return value (if any) is already pushed on the stack by the cg. | |
| 505 add_exception_states_from(new_jvms); | |
| 506 if (new_jvms->map()->control() == top()) { | |
| 507 stop_and_kill_map(); | |
| 508 } else { | |
| 509 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
| 510 set_jvms(new_jvms); | |
| 511 } | |
| 512 | |
| 513 if (!stopped()) { | |
| 514 // This was some sort of virtual call, which did a null check for us. | |
| 515 // Now we can assert receiver-not-null, on the normal return path. | |
| 516 if (receiver != NULL && cg->is_virtual()) { | |
| 517 Node* cast = cast_not_null(receiver); | |
| 518 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
| 519 } | |
| 520 | |
| 521 // Round double result after a call from strict to non-strict code | |
| 522 round_double_result(dest_method); | |
| 523 | |
| 524 // If the return type of the method is not loaded, assert that the | |
| 525 // value we got is a null. Otherwise, we need to recompile. | |
| 526 if (!dest_method->return_type()->is_loaded()) { | |
| 527 #ifndef PRODUCT | |
| 528 if (PrintOpto && (Verbose || WizardMode)) { | |
| 529 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
| 530 dest_method->print_name(); tty->cr(); | |
| 531 } | |
| 532 #endif | |
| 533 if (C->log() != NULL) { | |
| 534 C->log()->elem("assert_null reason='return' klass='%d'", | |
| 535 C->log()->identify(dest_method->return_type())); | |
| 536 } | |
| 537 // If there is going to be a trap, put it at the next bytecode: | |
| 538 set_bci(iter().next_bci()); | |
| 539 do_null_assert(peek(), T_OBJECT); | |
| 540 set_bci(iter().cur_bci()); // put it back | |
| 541 } | |
| 542 } | |
| 543 | |
| 544 // Restart record of parsing work after possible inlining of call | |
| 545 #ifndef PRODUCT | |
| 546 parse_histogram()->set_initial_state(bc()); | |
| 547 #endif | |
| 548 } | |
| 549 | |
| 550 //---------------------------catch_call_exceptions----------------------------- | |
| 551 // Put a Catch and CatchProj nodes behind a just-created call. | |
| 552 // Send their caught exceptions to the proper handler. | |
| 553 // This may be used after a call to the rethrow VM stub, | |
| 554 // when it is needed to process unloaded exception classes. | |
| 555 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
| 556 // Exceptions are delivered through this channel: | |
| 557 Node* i_o = this->i_o(); | |
| 558 | |
| 559 // Add a CatchNode. | |
| 560 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
| 561 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
| 562 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
| 563 | |
| 564 for (; !handlers.is_done(); handlers.next()) { | |
| 565 ciExceptionHandler* h = handlers.handler(); | |
| 566 int h_bci = h->handler_bci(); | |
| 567 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
| 568 // Do not introduce unloaded exception types into the graph: | |
| 569 if (!h_klass->is_loaded()) { | |
| 570 if (saw_unloaded->contains(h_bci)) { | |
| 571 /* We've already seen an unloaded exception with h_bci, | |
| 572 so don't duplicate. Duplication will cause the CatchNode to be | |
| 573 unnecessarily large. See 4713716. */ | |
| 574 continue; | |
| 575 } else { | |
| 576 saw_unloaded->append(h_bci); | |
| 577 } | |
| 578 } | |
| 579 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
| 580 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
| 581 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
| 582 assert(!h_extype->empty(), "sanity"); | |
| 583 // Note: It's OK if the BCIs repeat themselves. | |
| 584 bcis->append(h_bci); | |
| 585 extypes->append(h_extype); | |
| 586 } | |
| 587 | |
| 588 int len = bcis->length(); | |
| 589 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
| 590 Node *catch_ = _gvn.transform(cn); | |
| 591 | |
| 592 // now branch with the exception state to each of the (potential) | |
| 593 // handlers | |
| 594 for(int i=0; i < len; i++) { | |
| 595 // Setup JVM state to enter the handler. | |
| 596 PreserveJVMState pjvms(this); | |
| 597 // Locals are just copied from before the call. | |
| 598 // Get control from the CatchNode. | |
| 599 int handler_bci = bcis->at(i); | |
| 600 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
| 601 // This handler cannot happen? | |
| 602 if (ctrl == top()) continue; | |
| 603 set_control(ctrl); | |
| 604 | |
| 605 // Create exception oop | |
| 606 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
| 607 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
| 608 | |
| 609 // Handle unloaded exception classes. | |
| 610 if (saw_unloaded->contains(handler_bci)) { | |
| 611 // An unloaded exception type is coming here. Do an uncommon trap. | |
| 612 #ifndef PRODUCT | |
| 613 // We do not expect the same handler bci to take both cold unloaded | |
| 614 // and hot loaded exceptions. But, watch for it. | |
| 615 if (extype->is_loaded()) { | |
| 616 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
| 617 method()->print_name(); tty->cr(); | |
| 618 } else if (PrintOpto && (Verbose || WizardMode)) { | |
| 619 tty->print("Bailing out on unloaded exception type "); | |
| 620 extype->klass()->print_name(); | |
| 621 tty->print(" at bci:%d in ", bci()); | |
| 622 method()->print_name(); tty->cr(); | |
| 623 } | |
| 624 #endif | |
| 625 // Emit an uncommon trap instead of processing the block. | |
| 626 set_bci(handler_bci); | |
| 627 push_ex_oop(ex_oop); | |
| 628 uncommon_trap(Deoptimization::Reason_unloaded, | |
| 629 Deoptimization::Action_reinterpret, | |
| 630 extype->klass(), "!loaded exception"); | |
| 631 set_bci(iter().cur_bci()); // put it back | |
| 632 continue; | |
| 633 } | |
| 634 | |
| 635 // go to the exception handler | |
| 636 if (handler_bci < 0) { // merge with corresponding rethrow node | |
| 637 throw_to_exit(make_exception_state(ex_oop)); | |
| 638 } else { // Else jump to corresponding handle | |
| 639 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
| 640 merge_exception(handler_bci); | |
| 641 } | |
| 642 } | |
| 643 | |
| 644 // The first CatchProj is for the normal return. | |
| 645 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
| 646 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
| 647 } | |
| 648 | |
| 649 | |
| 650 //----------------------------catch_inline_exceptions-------------------------- | |
| 651 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
| 652 // Common case 1: we have no handler, so all exceptions merge right into | |
| 653 // the rethrow case. | |
| 654 // Case 2: we have some handlers, with loaded exception klasses that have | |
| 655 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
| 656 // exception oop and branch to the handler directly. | |
| 657 // Case 3: We have some handlers with subklasses or are not loaded at | |
| 658 // compile-time. We have to call the runtime to resolve the exception. | |
| 659 // So we insert a RethrowCall and all the logic that goes with it. | |
| 660 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
| 661 // Caller is responsible for saving away the map for normal control flow! | |
| 662 assert(stopped(), "call set_map(NULL) first"); | |
| 663 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
| 664 | |
| 665 Node* ex_node = saved_ex_oop(ex_map); | |
| 666 if (ex_node == top()) { | |
| 667 // No action needed. | |
| 668 return; | |
| 669 } | |
| 670 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
| 671 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
| 672 if (ex_type == NULL) | |
| 673 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
| 674 | |
| 675 // determine potential exception handlers | |
| 676 ciExceptionHandlerStream handlers(method(), bci(), | |
| 677 ex_type->klass()->as_instance_klass(), | |
| 678 ex_type->klass_is_exact()); | |
| 679 | |
| 680 // Start executing from the given throw state. (Keep its stack, for now.) | |
| 681 // Get the exception oop as known at compile time. | |
| 682 ex_node = use_exception_state(ex_map); | |
| 683 | |
| 684 // Get the exception oop klass from its header | |
| 685 Node* ex_klass_node = NULL; | |
| 686 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
| 687 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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688 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
| 0 | 689 |
| 690 // Compute the exception klass a little more cleverly. | |
| 691 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
| 692 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
| 693 // each arm of the Phi. If I know something clever about the exceptions | |
| 694 // I'm loading the class from, I can replace the LoadKlass with the | |
| 695 // klass constant for the exception oop. | |
| 696 if( ex_node->is_Phi() ) { | |
| 697 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
| 698 for( uint i = 1; i < ex_node->req(); i++ ) { | |
| 699 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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700 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
| 0 | 701 ex_klass_node->init_req( i, k ); |
| 702 } | |
| 703 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
| 704 | |
| 705 } | |
| 706 } | |
| 707 | |
| 708 // Scan the exception table for applicable handlers. | |
| 709 // If none, we can call rethrow() and be done! | |
| 710 // If precise (loaded with no subklasses), insert a D.S. style | |
| 711 // pointer compare to the correct handler and loop back. | |
| 712 // If imprecise, switch to the Rethrow VM-call style handling. | |
| 713 | |
| 714 int remaining = handlers.count_remaining(); | |
| 715 | |
| 716 // iterate through all entries sequentially | |
| 717 for (;!handlers.is_done(); handlers.next()) { | |
| 718 ciExceptionHandler* handler = handlers.handler(); | |
| 719 | |
| 720 if (handler->is_rethrow()) { | |
| 721 // If we fell off the end of the table without finding an imprecise | |
| 722 // exception klass (and without finding a generic handler) then we | |
| 723 // know this exception is not handled in this method. We just rethrow | |
| 724 // the exception into the caller. | |
| 725 throw_to_exit(make_exception_state(ex_node)); | |
| 726 return; | |
| 727 } | |
| 728 | |
| 729 // exception handler bci range covers throw_bci => investigate further | |
| 730 int handler_bci = handler->handler_bci(); | |
| 731 | |
| 732 if (remaining == 1) { | |
| 733 push_ex_oop(ex_node); // Push exception oop for handler | |
| 734 #ifndef PRODUCT | |
| 735 if (PrintOpto && WizardMode) { | |
| 736 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
| 737 } | |
| 738 #endif | |
| 739 merge_exception(handler_bci); // jump to handler | |
| 740 return; // No more handling to be done here! | |
| 741 } | |
| 742 | |
| 1344 | 743 // Get the handler's klass |
| 0 | 744 ciInstanceKlass* klass = handler->catch_klass(); |
| 1344 | 745 |
| 746 if (!klass->is_loaded()) { // klass is not loaded? | |
| 747 // fall through into catch_call_exceptions which will emit a | |
| 748 // handler with an uncommon trap. | |
| 749 break; | |
| 0 | 750 } |
| 751 | |
| 752 if (klass->is_interface()) // should not happen, but... | |
| 753 break; // bail out | |
| 754 | |
| 1344 | 755 // Check the type of the exception against the catch type |
| 0 | 756 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
| 757 Node* con = _gvn.makecon(tk); | |
| 1344 | 758 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
| 759 if (!stopped()) { | |
| 760 PreserveJVMState pjvms(this); | |
| 761 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
| 762 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
| 0 | 763 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
| 764 push_ex_oop(ex_oop); // Push exception oop for handler | |
| 765 #ifndef PRODUCT | |
| 766 if (PrintOpto && WizardMode) { | |
| 767 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
| 768 klass->print_name(); | |
| 769 tty->cr(); | |
| 770 } | |
| 771 #endif | |
| 772 merge_exception(handler_bci); | |
| 773 } | |
| 1344 | 774 set_control(not_subtype_ctrl); |
| 0 | 775 |
| 776 // Come here if exception does not match handler. | |
| 777 // Carry on with more handler checks. | |
| 778 --remaining; | |
| 779 } | |
| 780 | |
| 781 assert(!stopped(), "you should return if you finish the chain"); | |
| 782 | |
| 783 // Oops, need to call into the VM to resolve the klasses at runtime. | |
| 784 // Note: This call must not deoptimize, since it is not a real at this bci! | |
| 785 kill_dead_locals(); | |
| 786 | |
| 787 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
| 788 OptoRuntime::rethrow_Type(), | |
| 789 OptoRuntime::rethrow_stub(), | |
| 790 NULL, NULL, | |
| 791 ex_node); | |
| 792 | |
| 793 // Rethrow is a pure call, no side effects, only a result. | |
| 794 // The result cannot be allocated, so we use I_O | |
| 795 | |
| 796 // Catch exceptions from the rethrow | |
| 797 catch_call_exceptions(handlers); | |
| 798 } | |
| 799 | |
| 800 | |
| 801 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
| 802 | |
| 803 | |
| 804 #ifndef PRODUCT | |
| 805 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
| 806 if( CountCompiledCalls ) { | |
| 807 if( at_method_entry ) { | |
| 808 // bump invocation counter if top method (for statistics) | |
| 809 if (CountCompiledCalls && depth() == 1) { | |
| 810 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
| 811 Node* adr1 = makecon(addr_type); | |
| 812 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
| 813 increment_counter(adr2); | |
| 814 } | |
| 815 } else if (is_inline) { | |
| 816 switch (bc()) { | |
| 817 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
| 818 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
| 819 case Bytecodes::_invokestatic: | |
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820 case Bytecodes::_invokedynamic: |
| 0 | 821 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
| 822 default: fatal("unexpected call bytecode"); | |
| 823 } | |
| 824 } else { | |
| 825 switch (bc()) { | |
| 826 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
| 827 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
| 828 case Bytecodes::_invokestatic: | |
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829 case Bytecodes::_invokedynamic: |
| 0 | 830 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
| 831 default: fatal("unexpected call bytecode"); | |
| 832 } | |
| 833 } | |
| 834 } | |
| 835 } | |
| 836 #endif //PRODUCT | |
| 837 | |
| 838 | |
| 839 // Identify possible target method and inlining style | |
| 840 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
| 841 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
| 842 // only use for virtual or interface calls | |
| 843 | |
| 844 // If it is obviously final, do not bother to call find_monomorphic_target, | |
| 845 // because the class hierarchy checks are not needed, and may fail due to | |
| 846 // incompletely loaded classes. Since we do our own class loading checks | |
| 847 // in this module, we may confidently bind to any method. | |
| 848 if (dest_method->can_be_statically_bound()) { | |
| 849 return dest_method; | |
| 850 } | |
| 851 | |
| 852 // Attempt to improve the receiver | |
| 853 bool actual_receiver_is_exact = false; | |
| 854 ciInstanceKlass* actual_receiver = klass; | |
| 855 if (receiver_type != NULL) { | |
| 856 // Array methods are all inherited from Object, and are monomorphic. | |
| 857 if (receiver_type->isa_aryptr() && | |
| 858 dest_method->holder() == env()->Object_klass()) { | |
| 859 return dest_method; | |
| 860 } | |
| 861 | |
| 862 // All other interesting cases are instance klasses. | |
| 863 if (!receiver_type->isa_instptr()) { | |
| 864 return NULL; | |
| 865 } | |
| 866 | |
| 867 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
| 868 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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869 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
| 0 | 870 // ikl is a same or better type than the original actual_receiver, |
| 871 // e.g. static receiver from bytecodes. | |
| 872 actual_receiver = ikl; | |
| 873 // Is the actual_receiver exact? | |
| 874 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
| 875 } | |
| 876 } | |
| 877 | |
| 878 ciInstanceKlass* calling_klass = caller->holder(); | |
| 879 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
| 880 if (cha_monomorphic_target != NULL) { | |
| 881 assert(!cha_monomorphic_target->is_abstract(), ""); | |
| 882 // Look at the method-receiver type. Does it add "too much information"? | |
| 883 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
| 884 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
| 885 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
| 886 // Calling this method would include an implicit cast to its holder. | |
| 887 // %%% Not yet implemented. Would throw minor asserts at present. | |
| 888 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
| 889 // To fix, put the higher_equal check at the call of this routine, | |
| 890 // and add a CheckCastPP to the receiver. | |
| 891 if (TraceDependencies) { | |
| 892 tty->print_cr("found unique CHA method, but could not cast up"); | |
| 893 tty->print(" method = "); | |
| 894 cha_monomorphic_target->print(); | |
| 895 tty->cr(); | |
| 896 } | |
| 897 if (C->log() != NULL) { | |
| 898 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
| 899 C->log()->identify(klass), | |
| 900 C->log()->identify(cha_monomorphic_target)); | |
| 901 } | |
| 902 cha_monomorphic_target = NULL; | |
| 903 } | |
| 904 } | |
| 905 if (cha_monomorphic_target != NULL) { | |
| 906 // Hardwiring a virtual. | |
| 907 // If we inlined because CHA revealed only a single target method, | |
| 908 // then we are dependent on that target method not getting overridden | |
| 909 // by dynamic class loading. Be sure to test the "static" receiver | |
| 910 // dest_method here, as opposed to the actual receiver, which may | |
| 911 // falsely lead us to believe that the receiver is final or private. | |
| 912 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
| 913 return cha_monomorphic_target; | |
| 914 } | |
| 915 | |
| 916 // If the type is exact, we can still bind the method w/o a vcall. | |
| 917 // (This case comes after CHA so we can see how much extra work it does.) | |
| 918 if (actual_receiver_is_exact) { | |
| 919 // In case of evolution, there is a dependence on every inlined method, since each | |
| 920 // such method can be changed when its class is redefined. | |
| 921 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
| 922 if (exact_method != NULL) { | |
| 923 #ifndef PRODUCT | |
| 924 if (PrintOpto) { | |
| 925 tty->print(" Calling method via exact type @%d --- ", bci); | |
| 926 exact_method->print_name(); | |
| 927 tty->cr(); | |
| 928 } | |
| 929 #endif | |
| 930 return exact_method; | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 return NULL; | |
| 935 } |