Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 2462:4124a5a27707
7009600: JSR 292 Server compiler crashes in Compile::find_intrinsic(ciMethod*, bool)
Summary: catch errors during the compile-time processing of method handles; back out cleanly
Reviewed-by: twisti
| author | jrose |
|---|---|
| date | Thu, 07 Apr 2011 17:12:23 -0700 |
| parents | 3d58a4983660 |
| children | e2a92dd0d3d2 |
| 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) { |
| 0 | 65 CallGenerator* cg; |
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66 guarantee(call_method != NULL, "failed method resolution"); |
| 0 | 67 |
| 68 // Dtrace currently doesn't work unless all calls are vanilla | |
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69 if (env()->dtrace_method_probes()) { |
| 0 | 70 allow_inline = false; |
| 71 } | |
| 72 | |
| 73 // Note: When we get profiling during stage-1 compiles, we want to pull | |
| 74 // from more specific profile data which pertains to this inlining. | |
| 75 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
| 76 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci()); | |
| 77 | |
| 78 // See how many times this site has been invoked. | |
| 79 int site_count = profile.count(); | |
| 80 int receiver_count = -1; | |
| 81 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) { | |
| 82 // Receivers in the profile structure are ordered by call counts | |
| 83 // so that the most called (major) receiver is profile.receiver(0). | |
| 84 receiver_count = profile.receiver_count(0); | |
| 85 } | |
| 86 | |
| 87 CompileLog* log = this->log(); | |
| 88 if (log != NULL) { | |
| 89 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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90 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
| 0 | 91 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
| 92 log->identify(call_method), site_count, prof_factor); | |
| 93 if (call_is_virtual) log->print(" virtual='1'"); | |
| 94 if (allow_inline) log->print(" inline='1'"); | |
| 95 if (receiver_count >= 0) { | |
| 96 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
| 97 if (profile.has_receiver(1)) { | |
| 98 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
| 99 } | |
| 100 } | |
| 101 log->end_elem(); | |
| 102 } | |
| 103 | |
| 104 // Special case the handling of certain common, profitable library | |
| 105 // methods. If these methods are replaced with specialized code, | |
| 106 // then we return it as the inlined version of the call. | |
| 107 // We do this before the strict f.p. check below because the | |
| 108 // intrinsics handle strict f.p. correctly. | |
| 109 if (allow_inline) { | |
| 110 cg = find_intrinsic(call_method, call_is_virtual); | |
| 111 if (cg != NULL) return cg; | |
| 112 } | |
| 113 | |
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114 // Do MethodHandle calls. |
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115 // NOTE: This must happen before normal inlining logic below since |
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116 // MethodHandle.invoke* are native methods which obviously don't |
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117 // have bytecodes and so normal inlining fails. |
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118 if (call_method->is_method_handle_invoke()) { |
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119 if (jvms->method()->java_code_at_bci(jvms->bci()) != Bytecodes::_invokedynamic) { |
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120 GraphKit kit(jvms); |
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121 Node* n = kit.argument(0); |
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122 |
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123 if (n->Opcode() == Op_ConP) { |
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124 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr(); |
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125 ciObject* const_oop = oop_ptr->const_oop(); |
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126 ciMethodHandle* method_handle = const_oop->as_method_handle(); |
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127 |
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128 // Set the actually called method to have access to the class |
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129 // and signature in the MethodHandleCompiler. |
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130 method_handle->set_callee(call_method); |
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131 |
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132 // Get an adapter for the MethodHandle. |
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133 ciMethod* target_method = method_handle->get_method_handle_adapter(); |
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134 CallGenerator* hit_cg = NULL; |
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135 if (target_method != NULL) |
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136 hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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137 if (hit_cg != NULL && hit_cg->is_inline()) |
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138 return hit_cg; |
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139 } |
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140 |
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141 return CallGenerator::for_direct_call(call_method); |
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142 } |
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143 else { |
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144 // Get the MethodHandle from the CallSite. |
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145 ciMethod* caller_method = jvms->method(); |
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146 ciBytecodeStream str(caller_method); |
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147 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci. |
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148 ciCallSite* call_site = str.get_call_site(); |
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149 ciMethodHandle* method_handle = call_site->get_target(); |
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150 |
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151 // Set the actually called method to have access to the class |
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152 // and signature in the MethodHandleCompiler. |
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153 method_handle->set_callee(call_method); |
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154 |
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155 // Get an adapter for the MethodHandle. |
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156 ciMethod* target_method = method_handle->get_invokedynamic_adapter(); |
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157 CallGenerator* hit_cg = NULL; |
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158 if (target_method != NULL) |
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159 hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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160 if (hit_cg != NULL && hit_cg->is_inline()) { |
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161 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method); |
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162 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor); |
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163 } |
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164 |
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165 // If something failed, generate a normal dynamic call. |
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166 return CallGenerator::for_dynamic_call(call_method); |
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167 } |
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168 } |
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169 |
| 0 | 170 // Do not inline strict fp into non-strict code, or the reverse |
| 171 bool caller_method_is_strict = jvms->method()->is_strict(); | |
| 172 if( caller_method_is_strict ^ call_method->is_strict() ) { | |
| 173 allow_inline = false; | |
| 174 } | |
| 175 | |
| 176 // Attempt to inline... | |
| 177 if (allow_inline) { | |
| 178 // The profile data is only partly attributable to this caller, | |
| 179 // scale back the call site information. | |
| 180 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
| 181 // This is the number of times we expect the call code to be used. | |
| 182 float expected_uses = past_uses; | |
| 183 | |
| 184 // Try inlining a bytecoded method: | |
| 185 if (!call_is_virtual) { | |
| 186 InlineTree* ilt; | |
| 187 if (UseOldInlining) { | |
| 188 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
| 189 } else { | |
| 190 // Make a disembodied, stateless ILT. | |
| 191 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
| 192 float site_invoke_ratio = prof_factor; | |
| 193 // Note: ilt is for the root of this parse, not the present call site. | |
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194 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0); |
| 0 | 195 } |
| 196 WarmCallInfo scratch_ci; | |
| 197 if (!UseOldInlining) | |
| 198 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
| 199 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
| 200 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
| 201 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
| 202 bool require_inline = (allow_inline && ci->is_hot()); | |
| 203 | |
| 204 if (allow_inline) { | |
| 205 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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206 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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207 // Delay the inlining of this method to give us the |
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208 // opportunity to perform some high level optimizations |
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209 // first. |
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210 return CallGenerator::for_late_inline(call_method, cg); |
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211 } |
| 0 | 212 if (cg == NULL) { |
| 213 // Fall through. | |
| 214 } else if (require_inline || !InlineWarmCalls) { | |
| 215 return cg; | |
| 216 } else { | |
| 217 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
| 218 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
| 219 } | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 // Try using the type profile. | |
| 224 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
| 225 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
| 226 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
| 227 ciMethod* receiver_method = NULL; | |
| 228 if (have_major_receiver || profile.morphism() == 1 || | |
| 229 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
| 230 // receiver_method = profile.method(); | |
| 231 // Profiles do not suggest methods now. Look it up in the major receiver. | |
| 232 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
| 233 profile.receiver(0)); | |
| 234 } | |
| 235 if (receiver_method != NULL) { | |
| 236 // The single majority receiver sufficiently outweighs the minority. | |
| 237 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
| 238 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
| 239 if (hit_cg != NULL) { | |
| 240 // Look up second receiver. | |
| 241 CallGenerator* next_hit_cg = NULL; | |
| 242 ciMethod* next_receiver_method = NULL; | |
| 243 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
| 244 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
| 245 profile.receiver(1)); | |
| 246 if (next_receiver_method != NULL) { | |
| 247 next_hit_cg = this->call_generator(next_receiver_method, | |
| 248 vtable_index, !call_is_virtual, jvms, | |
| 249 allow_inline, prof_factor); | |
| 250 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
| 251 have_major_receiver && UseOnlyInlinedBimorphic) { | |
| 252 // Skip if we can't inline second receiver's method | |
| 253 next_hit_cg = NULL; | |
| 254 } | |
| 255 } | |
| 256 } | |
| 257 CallGenerator* miss_cg; | |
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258 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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259 Deoptimization::Reason_bimorphic : |
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260 Deoptimization::Reason_class_check; |
| 0 | 261 if (( profile.morphism() == 1 || |
| 262 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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263 !too_many_traps(jvms->method(), jvms->bci(), reason) |
| 0 | 264 ) { |
| 265 // Generate uncommon trap for class check failure path | |
| 266 // in case of monomorphic or bimorphic virtual call site. | |
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267 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
| 0 | 268 Deoptimization::Action_maybe_recompile); |
| 269 } else { | |
| 270 // Generate virtual call for class check failure path | |
| 271 // in case of polymorphic virtual call site. | |
| 272 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
| 273 } | |
| 274 if (miss_cg != NULL) { | |
| 275 if (next_hit_cg != NULL) { | |
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276 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 | 277 // We don't need to record dependency on a receiver here and below. |
| 278 // Whenever we inline, the dependency is added by Parse::Parse(). | |
| 279 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
| 280 } | |
| 281 if (miss_cg != NULL) { | |
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282 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
| 0 | 283 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
| 284 if (cg != NULL) return cg; | |
| 285 } | |
| 286 } | |
| 287 } | |
| 288 } | |
| 289 } | |
| 290 } | |
| 291 | |
| 292 // There was no special inlining tactic, or it bailed out. | |
| 293 // Use a more generic tactic, like a simple call. | |
| 294 if (call_is_virtual) { | |
| 295 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
| 296 } else { | |
| 297 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
| 298 // or it is a static or special call. | |
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299 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
| 0 | 300 } |
| 301 } | |
| 302 | |
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303 // Return true for methods that shouldn't be inlined early so that |
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304 // they are easier to analyze and optimize as intrinsics. |
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305 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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306 if (has_stringbuilder()) { |
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307 |
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308 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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309 call_method->holder() == C->env()->StringBuffer_klass()) && |
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310 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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311 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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312 // Delay SB calls only when called from non-SB code |
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313 return false; |
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314 } |
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315 |
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316 switch (call_method->intrinsic_id()) { |
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317 case vmIntrinsics::_StringBuilder_void: |
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318 case vmIntrinsics::_StringBuilder_int: |
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319 case vmIntrinsics::_StringBuilder_String: |
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320 case vmIntrinsics::_StringBuilder_append_char: |
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321 case vmIntrinsics::_StringBuilder_append_int: |
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322 case vmIntrinsics::_StringBuilder_append_String: |
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323 case vmIntrinsics::_StringBuilder_toString: |
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324 case vmIntrinsics::_StringBuffer_void: |
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325 case vmIntrinsics::_StringBuffer_int: |
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326 case vmIntrinsics::_StringBuffer_String: |
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327 case vmIntrinsics::_StringBuffer_append_char: |
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328 case vmIntrinsics::_StringBuffer_append_int: |
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329 case vmIntrinsics::_StringBuffer_append_String: |
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330 case vmIntrinsics::_StringBuffer_toString: |
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331 case vmIntrinsics::_Integer_toString: |
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332 return true; |
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333 |
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334 case vmIntrinsics::_String_String: |
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335 { |
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336 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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337 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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338 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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339 ciMethod* m = csj->method(); |
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340 if (m != NULL && |
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341 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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342 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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343 // Delay String.<init>(new SB()) |
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344 return true; |
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345 } |
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346 return false; |
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347 } |
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348 |
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349 default: |
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350 return false; |
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351 } |
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352 } |
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353 return false; |
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354 } |
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355 |
| 0 | 356 |
| 357 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
| 358 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
| 359 // Additional inputs to consider... | |
| 360 // bc = bc() | |
| 361 // caller = method() | |
| 362 // iter().get_method_holder_index() | |
| 363 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
| 364 // Interface classes can be loaded & linked and never get around to | |
| 365 // being initialized. Uncommon-trap for not-initialized static or | |
| 366 // v-calls. Let interface calls happen. | |
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367 ciInstanceKlass* holder_klass = dest_method->holder(); |
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368 if (!holder_klass->is_being_initialized() && |
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369 !holder_klass->is_initialized() && |
| 0 | 370 !holder_klass->is_interface()) { |
| 371 uncommon_trap(Deoptimization::Reason_uninitialized, | |
| 372 Deoptimization::Action_reinterpret, | |
| 373 holder_klass); | |
| 374 return true; | |
| 375 } | |
| 376 | |
| 377 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
| 378 return false; | |
| 379 } | |
| 380 | |
| 381 | |
| 382 //------------------------------do_call---------------------------------------- | |
| 383 // Handle your basic call. Inline if we can & want to, else just setup call. | |
| 384 void Parse::do_call() { | |
| 385 // It's likely we are going to add debug info soon. | |
| 386 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
| 387 // our contribution to it is cleaned up right here. | |
| 388 kill_dead_locals(); | |
| 389 | |
| 390 // Set frequently used booleans | |
| 391 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
| 392 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
| 393 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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394 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
| 0 | 395 |
| 396 // Find target being called | |
| 397 bool will_link; | |
| 398 ciMethod* dest_method = iter().get_method(will_link); | |
| 399 ciInstanceKlass* holder_klass = dest_method->holder(); | |
| 400 ciKlass* holder = iter().get_declared_method_holder(); | |
| 401 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
| 402 | |
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403 int nargs = dest_method->arg_size(); |
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404 if (is_invokedynamic) nargs -= 1; |
| 0 | 405 |
| 406 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
| 407 // bailout when too many arguments for register representation | |
| 408 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
| 409 #ifndef PRODUCT | |
| 410 if (PrintOpto && (Verbose || WizardMode)) { | |
| 411 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
| 412 dest_method->print_name(); tty->cr(); | |
| 413 } | |
| 414 #endif | |
| 415 return; | |
| 416 } | |
| 417 assert(holder_klass->is_loaded(), ""); | |
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418 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
| 0 | 419 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
| 420 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
| 421 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
| 422 // Note: In the absence of miranda methods, an abstract class K can perform | |
| 423 // an invokevirtual directly on an interface method I.m if K implements I. | |
| 424 | |
| 425 // --------------------- | |
| 426 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
| 427 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
| 428 // Does the call-site type profile reveal only one receiver? | |
| 429 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
| 430 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
| 431 | |
| 432 // Choose call strategy. | |
| 433 bool call_is_virtual = is_virtual_or_interface; | |
| 434 int vtable_index = methodOopDesc::invalid_vtable_index; | |
| 435 ciMethod* call_method = dest_method; | |
| 436 | |
| 437 // Try to get the most accurate receiver type | |
| 438 if (is_virtual_or_interface) { | |
| 439 Node* receiver_node = stack(sp() - nargs); | |
| 440 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
| 441 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
| 442 | |
| 443 // Have the call been sufficiently improved such that it is no longer a virtual? | |
| 444 if (optimized_virtual_method != NULL) { | |
| 445 call_method = optimized_virtual_method; | |
| 446 call_is_virtual = false; | |
| 447 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
| 448 // We can make a vtable call at this site | |
| 449 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 // Note: It's OK to try to inline a virtual call. | |
| 454 // The call generator will not attempt to inline a polymorphic call | |
| 455 // unless it knows how to optimize the receiver dispatch. | |
| 456 bool try_inline = (C->do_inlining() || InlineAccessors); | |
| 457 | |
| 458 // --------------------- | |
| 459 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
| 460 JVMState* jvms = sync_jvms(); | |
| 461 | |
| 462 // --------------------- | |
| 463 // Decide call tactic. | |
| 464 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
| 465 // It decides whether inlining is desirable or not. | |
| 466 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
| 467 | |
| 468 // --------------------- | |
| 469 // Round double arguments before call | |
| 470 round_double_arguments(dest_method); | |
| 471 | |
| 472 #ifndef PRODUCT | |
| 473 // bump global counters for calls | |
| 474 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
| 475 | |
| 476 // Record first part of parsing work for this call | |
| 477 parse_histogram()->record_change(); | |
| 478 #endif // not PRODUCT | |
| 479 | |
| 480 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
| 481 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
| 482 | |
| 483 // save across call, for a subsequent cast_not_null. | |
| 484 Node* receiver = has_receiver ? argument(0) : NULL; | |
| 485 | |
| 486 // Bump method data counters (We profile *before* the call is made | |
| 487 // because exceptions don't return to the call site.) | |
| 488 profile_call(receiver); | |
| 489 | |
| 490 JVMState* new_jvms; | |
| 491 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
| 492 // When inlining attempt fails (e.g., too many arguments), | |
| 493 // it may contaminate the current compile state, making it | |
| 494 // impossible to pull back and try again. Once we call | |
| 495 // cg->generate(), we are committed. If it fails, the whole | |
| 496 // compilation task is compromised. | |
| 497 if (failing()) return; | |
| 498 #ifndef PRODUCT | |
| 499 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
| 500 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
| 501 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
| 502 tty->print("Bailed out of intrinsic, will not inline: "); | |
| 503 call_method->print_name(); tty->cr(); | |
| 504 } | |
| 505 } | |
| 506 #endif | |
| 507 // This can happen if a library intrinsic is available, but refuses | |
| 508 // the call site, perhaps because it did not match a pattern the | |
| 509 // intrinsic was expecting to optimize. The fallback position is | |
| 510 // to call out-of-line. | |
| 511 try_inline = false; // Inline tactic bailed out. | |
| 512 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
| 513 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
| 514 guarantee(failing(), "call failed to generate: calls should work"); | |
| 515 return; | |
| 516 } | |
| 517 } | |
| 518 | |
| 519 if (cg->is_inline()) { | |
| 67 | 520 // Accumulate has_loops estimate |
| 521 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
| 0 | 522 C->env()->notice_inlined_method(call_method); |
| 523 } | |
| 524 | |
| 525 // Reset parser state from [new_]jvms, which now carries results of the call. | |
| 526 // Return value (if any) is already pushed on the stack by the cg. | |
| 527 add_exception_states_from(new_jvms); | |
| 528 if (new_jvms->map()->control() == top()) { | |
| 529 stop_and_kill_map(); | |
| 530 } else { | |
| 531 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
| 532 set_jvms(new_jvms); | |
| 533 } | |
| 534 | |
| 535 if (!stopped()) { | |
| 536 // This was some sort of virtual call, which did a null check for us. | |
| 537 // Now we can assert receiver-not-null, on the normal return path. | |
| 538 if (receiver != NULL && cg->is_virtual()) { | |
| 539 Node* cast = cast_not_null(receiver); | |
| 540 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
| 541 } | |
| 542 | |
| 543 // Round double result after a call from strict to non-strict code | |
| 544 round_double_result(dest_method); | |
| 545 | |
| 546 // If the return type of the method is not loaded, assert that the | |
| 547 // value we got is a null. Otherwise, we need to recompile. | |
| 548 if (!dest_method->return_type()->is_loaded()) { | |
| 549 #ifndef PRODUCT | |
| 550 if (PrintOpto && (Verbose || WizardMode)) { | |
| 551 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
| 552 dest_method->print_name(); tty->cr(); | |
| 553 } | |
| 554 #endif | |
| 555 if (C->log() != NULL) { | |
| 556 C->log()->elem("assert_null reason='return' klass='%d'", | |
| 557 C->log()->identify(dest_method->return_type())); | |
| 558 } | |
| 559 // If there is going to be a trap, put it at the next bytecode: | |
| 560 set_bci(iter().next_bci()); | |
| 561 do_null_assert(peek(), T_OBJECT); | |
| 562 set_bci(iter().cur_bci()); // put it back | |
| 563 } | |
| 564 } | |
| 565 | |
| 566 // Restart record of parsing work after possible inlining of call | |
| 567 #ifndef PRODUCT | |
| 568 parse_histogram()->set_initial_state(bc()); | |
| 569 #endif | |
| 570 } | |
| 571 | |
| 572 //---------------------------catch_call_exceptions----------------------------- | |
| 573 // Put a Catch and CatchProj nodes behind a just-created call. | |
| 574 // Send their caught exceptions to the proper handler. | |
| 575 // This may be used after a call to the rethrow VM stub, | |
| 576 // when it is needed to process unloaded exception classes. | |
| 577 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
| 578 // Exceptions are delivered through this channel: | |
| 579 Node* i_o = this->i_o(); | |
| 580 | |
| 581 // Add a CatchNode. | |
| 582 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
| 583 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
| 584 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
| 585 | |
| 586 for (; !handlers.is_done(); handlers.next()) { | |
| 587 ciExceptionHandler* h = handlers.handler(); | |
| 588 int h_bci = h->handler_bci(); | |
| 589 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
| 590 // Do not introduce unloaded exception types into the graph: | |
| 591 if (!h_klass->is_loaded()) { | |
| 592 if (saw_unloaded->contains(h_bci)) { | |
| 593 /* We've already seen an unloaded exception with h_bci, | |
| 594 so don't duplicate. Duplication will cause the CatchNode to be | |
| 595 unnecessarily large. See 4713716. */ | |
| 596 continue; | |
| 597 } else { | |
| 598 saw_unloaded->append(h_bci); | |
| 599 } | |
| 600 } | |
| 601 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
| 602 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
| 603 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
| 604 assert(!h_extype->empty(), "sanity"); | |
| 605 // Note: It's OK if the BCIs repeat themselves. | |
| 606 bcis->append(h_bci); | |
| 607 extypes->append(h_extype); | |
| 608 } | |
| 609 | |
| 610 int len = bcis->length(); | |
| 611 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
| 612 Node *catch_ = _gvn.transform(cn); | |
| 613 | |
| 614 // now branch with the exception state to each of the (potential) | |
| 615 // handlers | |
| 616 for(int i=0; i < len; i++) { | |
| 617 // Setup JVM state to enter the handler. | |
| 618 PreserveJVMState pjvms(this); | |
| 619 // Locals are just copied from before the call. | |
| 620 // Get control from the CatchNode. | |
| 621 int handler_bci = bcis->at(i); | |
| 622 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
| 623 // This handler cannot happen? | |
| 624 if (ctrl == top()) continue; | |
| 625 set_control(ctrl); | |
| 626 | |
| 627 // Create exception oop | |
| 628 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
| 629 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
| 630 | |
| 631 // Handle unloaded exception classes. | |
| 632 if (saw_unloaded->contains(handler_bci)) { | |
| 633 // An unloaded exception type is coming here. Do an uncommon trap. | |
| 634 #ifndef PRODUCT | |
| 635 // We do not expect the same handler bci to take both cold unloaded | |
| 636 // and hot loaded exceptions. But, watch for it. | |
| 637 if (extype->is_loaded()) { | |
| 638 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
| 639 method()->print_name(); tty->cr(); | |
| 640 } else if (PrintOpto && (Verbose || WizardMode)) { | |
| 641 tty->print("Bailing out on unloaded exception type "); | |
| 642 extype->klass()->print_name(); | |
| 643 tty->print(" at bci:%d in ", bci()); | |
| 644 method()->print_name(); tty->cr(); | |
| 645 } | |
| 646 #endif | |
| 647 // Emit an uncommon trap instead of processing the block. | |
| 648 set_bci(handler_bci); | |
| 649 push_ex_oop(ex_oop); | |
| 650 uncommon_trap(Deoptimization::Reason_unloaded, | |
| 651 Deoptimization::Action_reinterpret, | |
| 652 extype->klass(), "!loaded exception"); | |
| 653 set_bci(iter().cur_bci()); // put it back | |
| 654 continue; | |
| 655 } | |
| 656 | |
| 657 // go to the exception handler | |
| 658 if (handler_bci < 0) { // merge with corresponding rethrow node | |
| 659 throw_to_exit(make_exception_state(ex_oop)); | |
| 660 } else { // Else jump to corresponding handle | |
| 661 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
| 662 merge_exception(handler_bci); | |
| 663 } | |
| 664 } | |
| 665 | |
| 666 // The first CatchProj is for the normal return. | |
| 667 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
| 668 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
| 669 } | |
| 670 | |
| 671 | |
| 672 //----------------------------catch_inline_exceptions-------------------------- | |
| 673 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
| 674 // Common case 1: we have no handler, so all exceptions merge right into | |
| 675 // the rethrow case. | |
| 676 // Case 2: we have some handlers, with loaded exception klasses that have | |
| 677 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
| 678 // exception oop and branch to the handler directly. | |
| 679 // Case 3: We have some handlers with subklasses or are not loaded at | |
| 680 // compile-time. We have to call the runtime to resolve the exception. | |
| 681 // So we insert a RethrowCall and all the logic that goes with it. | |
| 682 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
| 683 // Caller is responsible for saving away the map for normal control flow! | |
| 684 assert(stopped(), "call set_map(NULL) first"); | |
| 685 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
| 686 | |
| 687 Node* ex_node = saved_ex_oop(ex_map); | |
| 688 if (ex_node == top()) { | |
| 689 // No action needed. | |
| 690 return; | |
| 691 } | |
| 692 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
| 693 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
| 694 if (ex_type == NULL) | |
| 695 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
| 696 | |
| 697 // determine potential exception handlers | |
| 698 ciExceptionHandlerStream handlers(method(), bci(), | |
| 699 ex_type->klass()->as_instance_klass(), | |
| 700 ex_type->klass_is_exact()); | |
| 701 | |
| 702 // Start executing from the given throw state. (Keep its stack, for now.) | |
| 703 // Get the exception oop as known at compile time. | |
| 704 ex_node = use_exception_state(ex_map); | |
| 705 | |
| 706 // Get the exception oop klass from its header | |
| 707 Node* ex_klass_node = NULL; | |
| 708 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
| 709 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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710 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
| 0 | 711 |
| 712 // Compute the exception klass a little more cleverly. | |
| 713 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
| 714 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
| 715 // each arm of the Phi. If I know something clever about the exceptions | |
| 716 // I'm loading the class from, I can replace the LoadKlass with the | |
| 717 // klass constant for the exception oop. | |
| 718 if( ex_node->is_Phi() ) { | |
| 719 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
| 720 for( uint i = 1; i < ex_node->req(); i++ ) { | |
| 721 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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722 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
| 0 | 723 ex_klass_node->init_req( i, k ); |
| 724 } | |
| 725 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
| 726 | |
| 727 } | |
| 728 } | |
| 729 | |
| 730 // Scan the exception table for applicable handlers. | |
| 731 // If none, we can call rethrow() and be done! | |
| 732 // If precise (loaded with no subklasses), insert a D.S. style | |
| 733 // pointer compare to the correct handler and loop back. | |
| 734 // If imprecise, switch to the Rethrow VM-call style handling. | |
| 735 | |
| 736 int remaining = handlers.count_remaining(); | |
| 737 | |
| 738 // iterate through all entries sequentially | |
| 739 for (;!handlers.is_done(); handlers.next()) { | |
| 740 ciExceptionHandler* handler = handlers.handler(); | |
| 741 | |
| 742 if (handler->is_rethrow()) { | |
| 743 // If we fell off the end of the table without finding an imprecise | |
| 744 // exception klass (and without finding a generic handler) then we | |
| 745 // know this exception is not handled in this method. We just rethrow | |
| 746 // the exception into the caller. | |
| 747 throw_to_exit(make_exception_state(ex_node)); | |
| 748 return; | |
| 749 } | |
| 750 | |
| 751 // exception handler bci range covers throw_bci => investigate further | |
| 752 int handler_bci = handler->handler_bci(); | |
| 753 | |
| 754 if (remaining == 1) { | |
| 755 push_ex_oop(ex_node); // Push exception oop for handler | |
| 756 #ifndef PRODUCT | |
| 757 if (PrintOpto && WizardMode) { | |
| 758 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
| 759 } | |
| 760 #endif | |
| 761 merge_exception(handler_bci); // jump to handler | |
| 762 return; // No more handling to be done here! | |
| 763 } | |
| 764 | |
| 1344 | 765 // Get the handler's klass |
| 0 | 766 ciInstanceKlass* klass = handler->catch_klass(); |
| 1344 | 767 |
| 768 if (!klass->is_loaded()) { // klass is not loaded? | |
| 769 // fall through into catch_call_exceptions which will emit a | |
| 770 // handler with an uncommon trap. | |
| 771 break; | |
| 0 | 772 } |
| 773 | |
| 774 if (klass->is_interface()) // should not happen, but... | |
| 775 break; // bail out | |
| 776 | |
| 1344 | 777 // Check the type of the exception against the catch type |
| 0 | 778 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
| 779 Node* con = _gvn.makecon(tk); | |
| 1344 | 780 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
| 781 if (!stopped()) { | |
| 782 PreserveJVMState pjvms(this); | |
| 783 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
| 784 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
| 0 | 785 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
| 786 push_ex_oop(ex_oop); // Push exception oop for handler | |
| 787 #ifndef PRODUCT | |
| 788 if (PrintOpto && WizardMode) { | |
| 789 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
| 790 klass->print_name(); | |
| 791 tty->cr(); | |
| 792 } | |
| 793 #endif | |
| 794 merge_exception(handler_bci); | |
| 795 } | |
| 1344 | 796 set_control(not_subtype_ctrl); |
| 0 | 797 |
| 798 // Come here if exception does not match handler. | |
| 799 // Carry on with more handler checks. | |
| 800 --remaining; | |
| 801 } | |
| 802 | |
| 803 assert(!stopped(), "you should return if you finish the chain"); | |
| 804 | |
| 805 // Oops, need to call into the VM to resolve the klasses at runtime. | |
| 806 // Note: This call must not deoptimize, since it is not a real at this bci! | |
| 807 kill_dead_locals(); | |
| 808 | |
| 809 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
| 810 OptoRuntime::rethrow_Type(), | |
| 811 OptoRuntime::rethrow_stub(), | |
| 812 NULL, NULL, | |
| 813 ex_node); | |
| 814 | |
| 815 // Rethrow is a pure call, no side effects, only a result. | |
| 816 // The result cannot be allocated, so we use I_O | |
| 817 | |
| 818 // Catch exceptions from the rethrow | |
| 819 catch_call_exceptions(handlers); | |
| 820 } | |
| 821 | |
| 822 | |
| 823 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
| 824 | |
| 825 | |
| 826 #ifndef PRODUCT | |
| 827 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
| 828 if( CountCompiledCalls ) { | |
| 829 if( at_method_entry ) { | |
| 830 // bump invocation counter if top method (for statistics) | |
| 831 if (CountCompiledCalls && depth() == 1) { | |
| 832 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
| 833 Node* adr1 = makecon(addr_type); | |
| 834 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
| 835 increment_counter(adr2); | |
| 836 } | |
| 837 } else if (is_inline) { | |
| 838 switch (bc()) { | |
| 839 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
| 840 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
| 841 case Bytecodes::_invokestatic: | |
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842 case Bytecodes::_invokedynamic: |
| 0 | 843 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
| 844 default: fatal("unexpected call bytecode"); | |
| 845 } | |
| 846 } else { | |
| 847 switch (bc()) { | |
| 848 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
| 849 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
| 850 case Bytecodes::_invokestatic: | |
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851 case Bytecodes::_invokedynamic: |
| 0 | 852 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
| 853 default: fatal("unexpected call bytecode"); | |
| 854 } | |
| 855 } | |
| 856 } | |
| 857 } | |
| 858 #endif //PRODUCT | |
| 859 | |
| 860 | |
| 861 // Identify possible target method and inlining style | |
| 862 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
| 863 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
| 864 // only use for virtual or interface calls | |
| 865 | |
| 866 // If it is obviously final, do not bother to call find_monomorphic_target, | |
| 867 // because the class hierarchy checks are not needed, and may fail due to | |
| 868 // incompletely loaded classes. Since we do our own class loading checks | |
| 869 // in this module, we may confidently bind to any method. | |
| 870 if (dest_method->can_be_statically_bound()) { | |
| 871 return dest_method; | |
| 872 } | |
| 873 | |
| 874 // Attempt to improve the receiver | |
| 875 bool actual_receiver_is_exact = false; | |
| 876 ciInstanceKlass* actual_receiver = klass; | |
| 877 if (receiver_type != NULL) { | |
| 878 // Array methods are all inherited from Object, and are monomorphic. | |
| 879 if (receiver_type->isa_aryptr() && | |
| 880 dest_method->holder() == env()->Object_klass()) { | |
| 881 return dest_method; | |
| 882 } | |
| 883 | |
| 884 // All other interesting cases are instance klasses. | |
| 885 if (!receiver_type->isa_instptr()) { | |
| 886 return NULL; | |
| 887 } | |
| 888 | |
| 889 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
| 890 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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891 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
| 0 | 892 // ikl is a same or better type than the original actual_receiver, |
| 893 // e.g. static receiver from bytecodes. | |
| 894 actual_receiver = ikl; | |
| 895 // Is the actual_receiver exact? | |
| 896 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
| 897 } | |
| 898 } | |
| 899 | |
| 900 ciInstanceKlass* calling_klass = caller->holder(); | |
| 901 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
| 902 if (cha_monomorphic_target != NULL) { | |
| 903 assert(!cha_monomorphic_target->is_abstract(), ""); | |
| 904 // Look at the method-receiver type. Does it add "too much information"? | |
| 905 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
| 906 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
| 907 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
| 908 // Calling this method would include an implicit cast to its holder. | |
| 909 // %%% Not yet implemented. Would throw minor asserts at present. | |
| 910 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
| 911 // To fix, put the higher_equal check at the call of this routine, | |
| 912 // and add a CheckCastPP to the receiver. | |
| 913 if (TraceDependencies) { | |
| 914 tty->print_cr("found unique CHA method, but could not cast up"); | |
| 915 tty->print(" method = "); | |
| 916 cha_monomorphic_target->print(); | |
| 917 tty->cr(); | |
| 918 } | |
| 919 if (C->log() != NULL) { | |
| 920 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
| 921 C->log()->identify(klass), | |
| 922 C->log()->identify(cha_monomorphic_target)); | |
| 923 } | |
| 924 cha_monomorphic_target = NULL; | |
| 925 } | |
| 926 } | |
| 927 if (cha_monomorphic_target != NULL) { | |
| 928 // Hardwiring a virtual. | |
| 929 // If we inlined because CHA revealed only a single target method, | |
| 930 // then we are dependent on that target method not getting overridden | |
| 931 // by dynamic class loading. Be sure to test the "static" receiver | |
| 932 // dest_method here, as opposed to the actual receiver, which may | |
| 933 // falsely lead us to believe that the receiver is final or private. | |
| 934 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
| 935 return cha_monomorphic_target; | |
| 936 } | |
| 937 | |
| 938 // If the type is exact, we can still bind the method w/o a vcall. | |
| 939 // (This case comes after CHA so we can see how much extra work it does.) | |
| 940 if (actual_receiver_is_exact) { | |
| 941 // In case of evolution, there is a dependence on every inlined method, since each | |
| 942 // such method can be changed when its class is redefined. | |
| 943 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
| 944 if (exact_method != NULL) { | |
| 945 #ifndef PRODUCT | |
| 946 if (PrintOpto) { | |
| 947 tty->print(" Calling method via exact type @%d --- ", bci); | |
| 948 exact_method->print_name(); | |
| 949 tty->cr(); | |
| 950 } | |
| 951 #endif | |
| 952 return exact_method; | |
| 953 } | |
| 954 } | |
| 955 | |
| 956 return NULL; | |
| 957 } |