Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 14213:6c4c27c5cc9a
8029366: ShouldNotReachHere error when creating an array with component type of void
Reviewed-by: kvn
author | twisti |
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date | Fri, 06 Dec 2013 16:43:56 -0800 |
parents | b2ee5dc63353 |
children | de6a9e811145 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciCallSite.hpp" | |
27 #include "ci/ciMethodHandle.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
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29 #include "compiler/compileBroker.hpp" |
1972 | 30 #include "compiler/compileLog.hpp" |
31 #include "interpreter/linkResolver.hpp" | |
32 #include "opto/addnode.hpp" | |
33 #include "opto/callGenerator.hpp" | |
34 #include "opto/cfgnode.hpp" | |
35 #include "opto/mulnode.hpp" | |
36 #include "opto/parse.hpp" | |
37 #include "opto/rootnode.hpp" | |
38 #include "opto/runtime.hpp" | |
39 #include "opto/subnode.hpp" | |
40 #include "prims/nativeLookup.hpp" | |
41 #include "runtime/sharedRuntime.hpp" | |
0 | 42 |
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43 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) { |
12295 | 44 if (TraceTypeProfile || C->print_inlining()) { |
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45 outputStream* out = tty; |
12295 | 46 if (!C->print_inlining()) { |
6793 | 47 if (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) { |
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48 method->print_short_name(); |
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49 tty->cr(); |
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50 } |
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51 CompileTask::print_inlining(prof_method, depth, bci); |
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52 } else { |
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53 out = C->print_inlining_stream(); |
0 | 54 } |
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55 CompileTask::print_inline_indent(depth, out); |
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56 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); |
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57 stringStream ss; |
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58 prof_klass->name()->print_symbol_on(&ss); |
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59 out->print(ss.as_string()); |
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60 out->cr(); |
0 | 61 } |
62 } | |
63 | |
7478 | 64 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch, |
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65 JVMState* jvms, bool allow_inline, |
12966 | 66 float prof_factor, ciKlass* speculative_receiver_type, |
67 bool allow_intrinsics, bool delayed_forbidden) { | |
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68 ciMethod* caller = jvms->method(); |
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69 int bci = jvms->bci(); |
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70 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); |
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71 guarantee(callee != NULL, "failed method resolution"); |
0 | 72 |
73 // Dtrace currently doesn't work unless all calls are vanilla | |
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74 if (env()->dtrace_method_probes()) { |
0 | 75 allow_inline = false; |
76 } | |
77 | |
78 // Note: When we get profiling during stage-1 compiles, we want to pull | |
79 // from more specific profile data which pertains to this inlining. | |
80 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
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81 ciCallProfile profile = caller->call_profile_at_bci(bci); |
0 | 82 |
83 // See how many times this site has been invoked. | |
84 int site_count = profile.count(); | |
85 int receiver_count = -1; | |
7478 | 86 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) { |
0 | 87 // Receivers in the profile structure are ordered by call counts |
88 // so that the most called (major) receiver is profile.receiver(0). | |
89 receiver_count = profile.receiver_count(0); | |
90 } | |
91 | |
92 CompileLog* log = this->log(); | |
93 if (log != NULL) { | |
94 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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95 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
0 | 96 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
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97 log->identify(callee), site_count, prof_factor); |
7478 | 98 if (call_does_dispatch) log->print(" virtual='1'"); |
0 | 99 if (allow_inline) log->print(" inline='1'"); |
100 if (receiver_count >= 0) { | |
101 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
102 if (profile.has_receiver(1)) { | |
103 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
104 } | |
105 } | |
106 log->end_elem(); | |
107 } | |
108 | |
109 // Special case the handling of certain common, profitable library | |
110 // methods. If these methods are replaced with specialized code, | |
111 // then we return it as the inlined version of the call. | |
112 // We do this before the strict f.p. check below because the | |
113 // intrinsics handle strict f.p. correctly. | |
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114 CallGenerator* cg_intrinsic = NULL; |
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115 if (allow_inline && allow_intrinsics) { |
7478 | 116 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch); |
6894 | 117 if (cg != NULL) { |
118 if (cg->is_predicted()) { | |
119 // Code without intrinsic but, hopefully, inlined. | |
120 CallGenerator* inline_cg = this->call_generator(callee, | |
12966 | 121 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false); |
6894 | 122 if (inline_cg != NULL) { |
123 cg = CallGenerator::for_predicted_intrinsic(cg, inline_cg); | |
124 } | |
125 } | |
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126 |
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127 // If intrinsic does the virtual dispatch, we try to use the type profile |
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128 // first, and hopefully inline it as the regular virtual call below. |
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129 // We will retry the intrinsic if nothing had claimed it afterwards. |
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130 if (cg->does_virtual_dispatch()) { |
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131 cg_intrinsic = cg; |
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132 cg = NULL; |
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133 } else { |
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134 return cg; |
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135 } |
6894 | 136 } |
0 | 137 } |
138 | |
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139 // Do method handle calls. |
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140 // NOTE: This must happen before normal inlining logic below since |
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141 // MethodHandle.invoke* are native methods which obviously don't |
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142 // have bytecodes and so normal inlining fails. |
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143 if (callee->is_method_handle_intrinsic()) { |
7473 | 144 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden); |
7478 | 145 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator"); |
7473 | 146 return cg; |
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147 } |
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148 |
0 | 149 // Do not inline strict fp into non-strict code, or the reverse |
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150 if (caller->is_strict() ^ callee->is_strict()) { |
0 | 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: | |
7478 | 163 if (!call_does_dispatch) { |
0 | 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) | |
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176 scratch_ci.init(jvms, callee, profile, prof_factor); |
7473 | 177 bool should_delay = false; |
178 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay); | |
0 | 179 assert(ci != &scratch_ci, "do not let this pointer escape"); |
180 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
181 bool require_inline = (allow_inline && ci->is_hot()); | |
182 | |
183 if (allow_inline) { | |
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184 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses); |
7473 | 185 |
186 if (require_inline && cg != NULL) { | |
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187 // Delay the inlining of this method to give us the |
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188 // opportunity to perform some high level optimizations |
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189 // first. |
10278 | 190 if (should_delay_string_inlining(callee, jvms)) { |
7473 | 191 assert(!delayed_forbidden, "strange"); |
192 return CallGenerator::for_string_late_inline(callee, cg); | |
10278 | 193 } else if (should_delay_boxing_inlining(callee, jvms)) { |
194 assert(!delayed_forbidden, "strange"); | |
195 return CallGenerator::for_boxing_late_inline(callee, cg); | |
7473 | 196 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) { |
197 return CallGenerator::for_late_inline(callee, cg); | |
198 } | |
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199 } |
7473 | 200 if (cg == NULL || should_delay) { |
0 | 201 // Fall through. |
202 } else if (require_inline || !InlineWarmCalls) { | |
203 return cg; | |
204 } else { | |
7478 | 205 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor); |
0 | 206 return CallGenerator::for_warm_call(ci, cold_cg, cg); |
207 } | |
208 } | |
209 } | |
210 | |
211 // Try using the type profile. | |
7478 | 212 if (call_does_dispatch && site_count > 0 && receiver_count > 0) { |
0 | 213 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. |
214 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
215 ciMethod* receiver_method = NULL; | |
12966 | 216 |
217 int morphism = profile.morphism(); | |
218 if (speculative_receiver_type != NULL) { | |
219 // We have a speculative type, we should be able to resolve | |
220 // the call. We do that before looking at the profiling at | |
221 // this invoke because it may lead to bimorphic inlining which | |
222 // a speculative type should help us avoid. | |
223 receiver_method = callee->resolve_invoke(jvms->method()->holder(), | |
224 speculative_receiver_type); | |
225 if (receiver_method == NULL) { | |
226 speculative_receiver_type = NULL; | |
227 } else { | |
228 morphism = 1; | |
229 } | |
230 } | |
231 if (receiver_method == NULL && | |
232 (have_major_receiver || morphism == 1 || | |
233 (morphism == 2 && UseBimorphicInlining))) { | |
0 | 234 // receiver_method = profile.method(); |
235 // Profiles do not suggest methods now. Look it up in the major receiver. | |
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236 receiver_method = callee->resolve_invoke(jvms->method()->holder(), |
0 | 237 profile.receiver(0)); |
238 } | |
239 if (receiver_method != NULL) { | |
240 // The single majority receiver sufficiently outweighs the minority. | |
241 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
7478 | 242 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor); |
0 | 243 if (hit_cg != NULL) { |
244 // Look up second receiver. | |
245 CallGenerator* next_hit_cg = NULL; | |
246 ciMethod* next_receiver_method = NULL; | |
12966 | 247 if (morphism == 2 && UseBimorphicInlining) { |
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248 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(), |
0 | 249 profile.receiver(1)); |
250 if (next_receiver_method != NULL) { | |
251 next_hit_cg = this->call_generator(next_receiver_method, | |
7478 | 252 vtable_index, !call_does_dispatch, jvms, |
0 | 253 allow_inline, prof_factor); |
254 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
255 have_major_receiver && UseOnlyInlinedBimorphic) { | |
256 // Skip if we can't inline second receiver's method | |
257 next_hit_cg = NULL; | |
258 } | |
259 } | |
260 } | |
261 CallGenerator* miss_cg; | |
12966 | 262 Deoptimization::DeoptReason reason = morphism == 2 ? |
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263 Deoptimization::Reason_bimorphic : |
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264 Deoptimization::Reason_class_check; |
12966 | 265 if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) && |
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266 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 267 ) { |
268 // Generate uncommon trap for class check failure path | |
269 // in case of monomorphic or bimorphic virtual call site. | |
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270 miss_cg = CallGenerator::for_uncommon_trap(callee, reason, |
0 | 271 Deoptimization::Action_maybe_recompile); |
272 } else { | |
273 // Generate virtual call for class check failure path | |
274 // in case of polymorphic virtual call site. | |
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275 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index); |
0 | 276 } |
277 if (miss_cg != NULL) { | |
278 if (next_hit_cg != NULL) { | |
12966 | 279 assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation"); |
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280 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)); |
0 | 281 // We don't need to record dependency on a receiver here and below. |
282 // Whenever we inline, the dependency is added by Parse::Parse(). | |
283 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
284 } | |
285 if (miss_cg != NULL) { | |
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286 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count); |
12966 | 287 ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0); |
288 float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0); | |
289 CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob); | |
0 | 290 if (cg != NULL) return cg; |
291 } | |
292 } | |
293 } | |
294 } | |
295 } | |
296 } | |
297 | |
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298 // Nothing claimed the intrinsic, we go with straight-forward inlining |
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299 // for already discovered intrinsic. |
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300 if (allow_inline && allow_intrinsics && cg_intrinsic != NULL) { |
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301 assert(cg_intrinsic->does_virtual_dispatch(), "sanity"); |
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302 return cg_intrinsic; |
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303 } |
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304 |
0 | 305 // There was no special inlining tactic, or it bailed out. |
306 // Use a more generic tactic, like a simple call. | |
7478 | 307 if (call_does_dispatch) { |
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308 return CallGenerator::for_virtual_call(callee, vtable_index); |
0 | 309 } else { |
310 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
311 // or it is a static or special call. | |
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312 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms)); |
0 | 313 } |
314 } | |
315 | |
1080
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316 // Return true for methods that shouldn't be inlined early so that |
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317 // they are easier to analyze and optimize as intrinsics. |
10278 | 318 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) { |
1080
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319 if (has_stringbuilder()) { |
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320 |
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321 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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322 call_method->holder() == C->env()->StringBuffer_klass()) && |
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323 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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324 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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325 // Delay SB calls only when called from non-SB code |
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326 return false; |
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327 } |
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328 |
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329 switch (call_method->intrinsic_id()) { |
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330 case vmIntrinsics::_StringBuilder_void: |
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331 case vmIntrinsics::_StringBuilder_int: |
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332 case vmIntrinsics::_StringBuilder_String: |
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333 case vmIntrinsics::_StringBuilder_append_char: |
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334 case vmIntrinsics::_StringBuilder_append_int: |
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335 case vmIntrinsics::_StringBuilder_append_String: |
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336 case vmIntrinsics::_StringBuilder_toString: |
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337 case vmIntrinsics::_StringBuffer_void: |
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338 case vmIntrinsics::_StringBuffer_int: |
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339 case vmIntrinsics::_StringBuffer_String: |
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340 case vmIntrinsics::_StringBuffer_append_char: |
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341 case vmIntrinsics::_StringBuffer_append_int: |
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342 case vmIntrinsics::_StringBuffer_append_String: |
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343 case vmIntrinsics::_StringBuffer_toString: |
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344 case vmIntrinsics::_Integer_toString: |
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345 return true; |
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346 |
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347 case vmIntrinsics::_String_String: |
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348 { |
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349 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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350 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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351 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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352 ciMethod* m = csj->method(); |
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353 if (m != NULL && |
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354 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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355 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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356 // Delay String.<init>(new SB()) |
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357 return true; |
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358 } |
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359 return false; |
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360 } |
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361 |
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362 default: |
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363 return false; |
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364 } |
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365 } |
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366 return false; |
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367 } |
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368 |
10278 | 369 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) { |
370 if (eliminate_boxing() && call_method->is_boxing_method()) { | |
371 set_has_boxed_value(true); | |
372 return true; | |
373 } | |
374 return false; | |
375 } | |
0 | 376 |
377 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
378 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
379 // Additional inputs to consider... | |
380 // bc = bc() | |
381 // caller = method() | |
382 // iter().get_method_holder_index() | |
383 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
384 // Interface classes can be loaded & linked and never get around to | |
385 // being initialized. Uncommon-trap for not-initialized static or | |
386 // v-calls. Let interface calls happen. | |
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387 ciInstanceKlass* holder_klass = dest_method->holder(); |
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388 if (!holder_klass->is_being_initialized() && |
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389 !holder_klass->is_initialized() && |
0 | 390 !holder_klass->is_interface()) { |
391 uncommon_trap(Deoptimization::Reason_uninitialized, | |
392 Deoptimization::Action_reinterpret, | |
393 holder_klass); | |
394 return true; | |
395 } | |
396 | |
6973 | 397 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility"); |
0 | 398 return false; |
399 } | |
400 | |
401 | |
402 //------------------------------do_call---------------------------------------- | |
403 // Handle your basic call. Inline if we can & want to, else just setup call. | |
404 void Parse::do_call() { | |
405 // It's likely we are going to add debug info soon. | |
406 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
407 // our contribution to it is cleaned up right here. | |
408 kill_dead_locals(); | |
409 | |
410 // Set frequently used booleans | |
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411 const bool is_virtual = bc() == Bytecodes::_invokevirtual; |
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412 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; |
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413 const bool has_receiver = Bytecodes::has_receiver(bc()); |
0 | 414 |
415 // Find target being called | |
416 bool will_link; | |
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417 ciSignature* declared_signature = NULL; |
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418 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode |
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419 ciInstanceKlass* holder_klass = orig_callee->holder(); |
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420 ciKlass* holder = iter().get_declared_method_holder(); |
0 | 421 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); |
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422 assert(declared_signature != NULL, "cannot be null"); |
0 | 423 |
424 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
425 // bailout when too many arguments for register representation | |
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426 if (!will_link || can_not_compile_call_site(orig_callee, klass)) { |
0 | 427 #ifndef PRODUCT |
428 if (PrintOpto && (Verbose || WizardMode)) { | |
429 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
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430 orig_callee->print_name(); tty->cr(); |
0 | 431 } |
432 #endif | |
433 return; | |
434 } | |
435 assert(holder_klass->is_loaded(), ""); | |
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436 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw) |
0 | 437 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
438 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
439 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
440 // Note: In the absence of miranda methods, an abstract class K can perform | |
441 // an invokevirtual directly on an interface method I.m if K implements I. | |
442 | |
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443 // orig_callee is the resolved callee which's signature includes the |
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444 // appendix argument. |
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445 const int nargs = orig_callee->arg_size(); |
7478 | 446 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id()); |
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447 |
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448 // Push appendix argument (MethodType, CallSite, etc.), if one. |
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449 if (iter().has_appendix()) { |
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450 ciObject* appendix_arg = iter().get_appendix(); |
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451 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg); |
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452 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type); |
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453 push(appendix_arg_node); |
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454 } |
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455 |
0 | 456 // --------------------- |
457 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
458 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
459 // Does the call-site type profile reveal only one receiver? | |
460 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
461 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
462 | |
7478 | 463 // Try to get the most accurate receiver type |
464 ciMethod* callee = orig_callee; | |
465 int vtable_index = Method::invalid_vtable_index; | |
466 bool call_does_dispatch = false; | |
0 | 467 |
12966 | 468 // Speculative type of the receiver if any |
469 ciKlass* speculative_receiver_type = NULL; | |
0 | 470 if (is_virtual_or_interface) { |
12966 | 471 Node* receiver_node = stack(sp() - nargs); |
0 | 472 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); |
7478 | 473 // call_does_dispatch and vtable_index are out-parameters. They might be changed. |
474 callee = C->optimize_virtual_call(method(), bci(), klass, orig_callee, receiver_type, | |
475 is_virtual, | |
476 call_does_dispatch, vtable_index); // out-parameters | |
12966 | 477 speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL; |
0 | 478 } |
479 | |
480 // Note: It's OK to try to inline a virtual call. | |
481 // The call generator will not attempt to inline a polymorphic call | |
482 // unless it knows how to optimize the receiver dispatch. | |
483 bool try_inline = (C->do_inlining() || InlineAccessors); | |
484 | |
485 // --------------------- | |
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486 dec_sp(nargs); // Temporarily pop args for JVM state of call |
0 | 487 JVMState* jvms = sync_jvms(); |
488 | |
489 // --------------------- | |
490 // Decide call tactic. | |
491 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
492 // It decides whether inlining is desirable or not. | |
12966 | 493 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type); |
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494 |
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495 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead. |
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496 orig_callee = callee = NULL; |
0 | 497 |
498 // --------------------- | |
499 // Round double arguments before call | |
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500 round_double_arguments(cg->method()); |
0 | 501 |
12966 | 502 // Feed profiling data for arguments to the type system so it can |
503 // propagate it as speculative types | |
504 record_profiled_arguments_for_speculation(cg->method(), bc()); | |
505 | |
0 | 506 #ifndef PRODUCT |
507 // bump global counters for calls | |
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508 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline()); |
0 | 509 |
510 // Record first part of parsing work for this call | |
511 parse_histogram()->record_change(); | |
512 #endif // not PRODUCT | |
513 | |
514 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
515 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
516 | |
517 // save across call, for a subsequent cast_not_null. | |
518 Node* receiver = has_receiver ? argument(0) : NULL; | |
519 | |
12966 | 520 // The extra CheckCastPP for speculative types mess with PhaseStringOpts |
521 if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) { | |
522 // Feed profiling data for a single receiver to the type system so | |
523 // it can propagate it as a speculative type | |
524 receiver = record_profiled_receiver_for_speculation(receiver); | |
525 } | |
526 | |
0 | 527 // Bump method data counters (We profile *before* the call is made |
528 // because exceptions don't return to the call site.) | |
529 profile_call(receiver); | |
530 | |
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531 JVMState* new_jvms = cg->generate(jvms, this); |
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532 if (new_jvms == NULL) { |
0 | 533 // When inlining attempt fails (e.g., too many arguments), |
534 // it may contaminate the current compile state, making it | |
535 // impossible to pull back and try again. Once we call | |
536 // cg->generate(), we are committed. If it fails, the whole | |
537 // compilation task is compromised. | |
538 if (failing()) return; | |
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539 |
0 | 540 // This can happen if a library intrinsic is available, but refuses |
541 // the call site, perhaps because it did not match a pattern the | |
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542 // intrinsic was expecting to optimize. Should always be possible to |
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543 // get a normal java call that may inline in that case |
12966 | 544 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false); |
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545 if ((new_jvms = cg->generate(jvms, this)) == NULL) { |
0 | 546 guarantee(failing(), "call failed to generate: calls should work"); |
547 return; | |
548 } | |
549 } | |
550 | |
551 if (cg->is_inline()) { | |
67 | 552 // Accumulate has_loops estimate |
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553 C->set_has_loops(C->has_loops() || cg->method()->has_loops()); |
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554 C->env()->notice_inlined_method(cg->method()); |
0 | 555 } |
556 | |
557 // Reset parser state from [new_]jvms, which now carries results of the call. | |
558 // Return value (if any) is already pushed on the stack by the cg. | |
559 add_exception_states_from(new_jvms); | |
560 if (new_jvms->map()->control() == top()) { | |
561 stop_and_kill_map(); | |
562 } else { | |
563 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
564 set_jvms(new_jvms); | |
565 } | |
566 | |
567 if (!stopped()) { | |
568 // This was some sort of virtual call, which did a null check for us. | |
569 // Now we can assert receiver-not-null, on the normal return path. | |
570 if (receiver != NULL && cg->is_virtual()) { | |
571 Node* cast = cast_not_null(receiver); | |
572 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
573 } | |
574 | |
575 // Round double result after a call from strict to non-strict code | |
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576 round_double_result(cg->method()); |
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577 |
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578 ciType* rtype = cg->method()->return_type(); |
7478 | 579 ciType* ctype = declared_signature->return_type(); |
580 | |
581 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) { | |
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582 // Be careful here with return types. |
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583 if (ctype != rtype) { |
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584 BasicType rt = rtype->basic_type(); |
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585 BasicType ct = ctype->basic_type(); |
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586 if (ct == T_VOID) { |
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587 // It's OK for a method to return a value that is discarded. |
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588 // The discarding does not require any special action from the caller. |
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589 // The Java code knows this, at VerifyType.isNullConversion. |
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590 pop_node(rt); // whatever it was, pop it |
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591 } else if (rt == T_INT || is_subword_type(rt)) { |
7478 | 592 // Nothing. These cases are handled in lambda form bytecode. |
593 assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct))); | |
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594 } else if (rt == T_OBJECT || rt == T_ARRAY) { |
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595 assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct))); |
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596 if (ctype->is_loaded()) { |
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597 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass()); |
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598 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass()); |
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599 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) { |
7478 | 600 Node* retnode = pop(); |
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601 Node* cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), retnode, sig_type)); |
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602 push(cast_obj); |
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603 } |
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604 } |
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605 } else { |
7478 | 606 assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct))); |
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607 // push a zero; it's better than getting an oop/int mismatch |
7478 | 608 pop_node(rt); |
609 Node* retnode = zerocon(ct); | |
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610 push_node(ct, retnode); |
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611 } |
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612 // Now that the value is well-behaved, continue with the call-site type. |
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613 rtype = ctype; |
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614 } |
7478 | 615 } else { |
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616 // Symbolic resolution enforces the types to be the same. |
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617 // NOTE: We must relax the assert for unloaded types because two |
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618 // different ciType instances of the same unloaded class type |
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619 // can appear to be "loaded" by different loaders (depending on |
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620 // the accessing class). |
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621 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype, |
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622 err_msg_res("mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name())); |
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623 } |
0 | 624 |
625 // If the return type of the method is not loaded, assert that the | |
626 // value we got is a null. Otherwise, we need to recompile. | |
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627 if (!rtype->is_loaded()) { |
0 | 628 #ifndef PRODUCT |
629 if (PrintOpto && (Verbose || WizardMode)) { | |
630 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
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631 cg->method()->print_name(); tty->cr(); |
0 | 632 } |
633 #endif | |
634 if (C->log() != NULL) { | |
635 C->log()->elem("assert_null reason='return' klass='%d'", | |
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636 C->log()->identify(rtype)); |
0 | 637 } |
638 // If there is going to be a trap, put it at the next bytecode: | |
639 set_bci(iter().next_bci()); | |
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640 null_assert(peek()); |
0 | 641 set_bci(iter().cur_bci()); // put it back |
642 } | |
12966 | 643 BasicType ct = ctype->basic_type(); |
644 if (ct == T_OBJECT || ct == T_ARRAY) { | |
645 ciKlass* better_type = method()->return_profiled_type(bci()); | |
646 if (UseTypeSpeculation && better_type != NULL) { | |
647 // If profiling reports a single type for the return value, | |
648 // feed it to the type system so it can propagate it as a | |
649 // speculative type | |
650 record_profile_for_speculation(stack(sp()-1), better_type); | |
651 } | |
652 } | |
0 | 653 } |
654 | |
655 // Restart record of parsing work after possible inlining of call | |
656 #ifndef PRODUCT | |
657 parse_histogram()->set_initial_state(bc()); | |
658 #endif | |
659 } | |
660 | |
661 //---------------------------catch_call_exceptions----------------------------- | |
662 // Put a Catch and CatchProj nodes behind a just-created call. | |
663 // Send their caught exceptions to the proper handler. | |
664 // This may be used after a call to the rethrow VM stub, | |
665 // when it is needed to process unloaded exception classes. | |
666 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
667 // Exceptions are delivered through this channel: | |
668 Node* i_o = this->i_o(); | |
669 | |
670 // Add a CatchNode. | |
671 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
672 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
673 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
674 | |
675 for (; !handlers.is_done(); handlers.next()) { | |
676 ciExceptionHandler* h = handlers.handler(); | |
677 int h_bci = h->handler_bci(); | |
678 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
679 // Do not introduce unloaded exception types into the graph: | |
680 if (!h_klass->is_loaded()) { | |
681 if (saw_unloaded->contains(h_bci)) { | |
682 /* We've already seen an unloaded exception with h_bci, | |
683 so don't duplicate. Duplication will cause the CatchNode to be | |
684 unnecessarily large. See 4713716. */ | |
685 continue; | |
686 } else { | |
687 saw_unloaded->append(h_bci); | |
688 } | |
689 } | |
690 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
691 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
692 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
693 assert(!h_extype->empty(), "sanity"); | |
694 // Note: It's OK if the BCIs repeat themselves. | |
695 bcis->append(h_bci); | |
696 extypes->append(h_extype); | |
697 } | |
698 | |
699 int len = bcis->length(); | |
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700 CatchNode *cn = new (C) CatchNode(control(), i_o, len+1); |
0 | 701 Node *catch_ = _gvn.transform(cn); |
702 | |
703 // now branch with the exception state to each of the (potential) | |
704 // handlers | |
705 for(int i=0; i < len; i++) { | |
706 // Setup JVM state to enter the handler. | |
707 PreserveJVMState pjvms(this); | |
708 // Locals are just copied from before the call. | |
709 // Get control from the CatchNode. | |
710 int handler_bci = bcis->at(i); | |
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711 Node* ctrl = _gvn.transform( new (C) CatchProjNode(catch_, i+1,handler_bci)); |
0 | 712 // This handler cannot happen? |
713 if (ctrl == top()) continue; | |
714 set_control(ctrl); | |
715 | |
716 // Create exception oop | |
717 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
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718 Node *ex_oop = _gvn.transform(new (C) CreateExNode(extypes->at(i), ctrl, i_o)); |
0 | 719 |
720 // Handle unloaded exception classes. | |
721 if (saw_unloaded->contains(handler_bci)) { | |
722 // An unloaded exception type is coming here. Do an uncommon trap. | |
723 #ifndef PRODUCT | |
724 // We do not expect the same handler bci to take both cold unloaded | |
725 // and hot loaded exceptions. But, watch for it. | |
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726 if ((Verbose || WizardMode) && extype->is_loaded()) { |
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727 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci()); |
0 | 728 method()->print_name(); tty->cr(); |
729 } else if (PrintOpto && (Verbose || WizardMode)) { | |
730 tty->print("Bailing out on unloaded exception type "); | |
731 extype->klass()->print_name(); | |
732 tty->print(" at bci:%d in ", bci()); | |
733 method()->print_name(); tty->cr(); | |
734 } | |
735 #endif | |
736 // Emit an uncommon trap instead of processing the block. | |
737 set_bci(handler_bci); | |
738 push_ex_oop(ex_oop); | |
739 uncommon_trap(Deoptimization::Reason_unloaded, | |
740 Deoptimization::Action_reinterpret, | |
741 extype->klass(), "!loaded exception"); | |
742 set_bci(iter().cur_bci()); // put it back | |
743 continue; | |
744 } | |
745 | |
746 // go to the exception handler | |
747 if (handler_bci < 0) { // merge with corresponding rethrow node | |
748 throw_to_exit(make_exception_state(ex_oop)); | |
749 } else { // Else jump to corresponding handle | |
750 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
751 merge_exception(handler_bci); | |
752 } | |
753 } | |
754 | |
755 // The first CatchProj is for the normal return. | |
756 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
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757 set_control(_gvn.transform( new (C) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); |
0 | 758 } |
759 | |
760 | |
761 //----------------------------catch_inline_exceptions-------------------------- | |
762 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
763 // Common case 1: we have no handler, so all exceptions merge right into | |
764 // the rethrow case. | |
765 // Case 2: we have some handlers, with loaded exception klasses that have | |
766 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
767 // exception oop and branch to the handler directly. | |
768 // Case 3: We have some handlers with subklasses or are not loaded at | |
769 // compile-time. We have to call the runtime to resolve the exception. | |
770 // So we insert a RethrowCall and all the logic that goes with it. | |
771 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
772 // Caller is responsible for saving away the map for normal control flow! | |
773 assert(stopped(), "call set_map(NULL) first"); | |
774 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
775 | |
776 Node* ex_node = saved_ex_oop(ex_map); | |
777 if (ex_node == top()) { | |
778 // No action needed. | |
779 return; | |
780 } | |
781 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
782 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
783 if (ex_type == NULL) | |
784 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
785 | |
786 // determine potential exception handlers | |
787 ciExceptionHandlerStream handlers(method(), bci(), | |
788 ex_type->klass()->as_instance_klass(), | |
789 ex_type->klass_is_exact()); | |
790 | |
791 // Start executing from the given throw state. (Keep its stack, for now.) | |
792 // Get the exception oop as known at compile time. | |
793 ex_node = use_exception_state(ex_map); | |
794 | |
795 // Get the exception oop klass from its header | |
796 Node* ex_klass_node = NULL; | |
797 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
798 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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799 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 800 |
801 // Compute the exception klass a little more cleverly. | |
802 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
803 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
804 // each arm of the Phi. If I know something clever about the exceptions | |
805 // I'm loading the class from, I can replace the LoadKlass with the | |
806 // klass constant for the exception oop. | |
807 if( ex_node->is_Phi() ) { | |
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808 ex_klass_node = new (C) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); |
0 | 809 for( uint i = 1; i < ex_node->req(); i++ ) { |
810 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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811 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 812 ex_klass_node->init_req( i, k ); |
813 } | |
814 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
815 | |
816 } | |
817 } | |
818 | |
819 // Scan the exception table for applicable handlers. | |
820 // If none, we can call rethrow() and be done! | |
821 // If precise (loaded with no subklasses), insert a D.S. style | |
822 // pointer compare to the correct handler and loop back. | |
823 // If imprecise, switch to the Rethrow VM-call style handling. | |
824 | |
825 int remaining = handlers.count_remaining(); | |
826 | |
827 // iterate through all entries sequentially | |
828 for (;!handlers.is_done(); handlers.next()) { | |
829 ciExceptionHandler* handler = handlers.handler(); | |
830 | |
831 if (handler->is_rethrow()) { | |
832 // If we fell off the end of the table without finding an imprecise | |
833 // exception klass (and without finding a generic handler) then we | |
834 // know this exception is not handled in this method. We just rethrow | |
835 // the exception into the caller. | |
836 throw_to_exit(make_exception_state(ex_node)); | |
837 return; | |
838 } | |
839 | |
840 // exception handler bci range covers throw_bci => investigate further | |
841 int handler_bci = handler->handler_bci(); | |
842 | |
843 if (remaining == 1) { | |
844 push_ex_oop(ex_node); // Push exception oop for handler | |
845 #ifndef PRODUCT | |
846 if (PrintOpto && WizardMode) { | |
847 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
848 } | |
849 #endif | |
850 merge_exception(handler_bci); // jump to handler | |
851 return; // No more handling to be done here! | |
852 } | |
853 | |
1344 | 854 // Get the handler's klass |
0 | 855 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 856 |
857 if (!klass->is_loaded()) { // klass is not loaded? | |
858 // fall through into catch_call_exceptions which will emit a | |
859 // handler with an uncommon trap. | |
860 break; | |
0 | 861 } |
862 | |
863 if (klass->is_interface()) // should not happen, but... | |
864 break; // bail out | |
865 | |
1344 | 866 // Check the type of the exception against the catch type |
0 | 867 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
868 Node* con = _gvn.makecon(tk); | |
1344 | 869 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
870 if (!stopped()) { | |
871 PreserveJVMState pjvms(this); | |
872 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
873 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
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874 Node* ex_oop = _gvn.transform(new (C) CheckCastPPNode(control(), ex_node, tinst)); |
0 | 875 push_ex_oop(ex_oop); // Push exception oop for handler |
876 #ifndef PRODUCT | |
877 if (PrintOpto && WizardMode) { | |
878 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
879 klass->print_name(); | |
880 tty->cr(); | |
881 } | |
882 #endif | |
883 merge_exception(handler_bci); | |
884 } | |
1344 | 885 set_control(not_subtype_ctrl); |
0 | 886 |
887 // Come here if exception does not match handler. | |
888 // Carry on with more handler checks. | |
889 --remaining; | |
890 } | |
891 | |
892 assert(!stopped(), "you should return if you finish the chain"); | |
893 | |
894 // Oops, need to call into the VM to resolve the klasses at runtime. | |
895 // Note: This call must not deoptimize, since it is not a real at this bci! | |
896 kill_dead_locals(); | |
897 | |
898 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
899 OptoRuntime::rethrow_Type(), | |
900 OptoRuntime::rethrow_stub(), | |
901 NULL, NULL, | |
902 ex_node); | |
903 | |
904 // Rethrow is a pure call, no side effects, only a result. | |
905 // The result cannot be allocated, so we use I_O | |
906 | |
907 // Catch exceptions from the rethrow | |
908 catch_call_exceptions(handlers); | |
909 } | |
910 | |
911 | |
912 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
913 | |
914 | |
915 #ifndef PRODUCT | |
916 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
917 if( CountCompiledCalls ) { | |
918 if( at_method_entry ) { | |
919 // bump invocation counter if top method (for statistics) | |
920 if (CountCompiledCalls && depth() == 1) { | |
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921 const TypePtr* addr_type = TypeMetadataPtr::make(method()); |
0 | 922 Node* adr1 = makecon(addr_type); |
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923 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset())); |
0 | 924 increment_counter(adr2); |
925 } | |
926 } else if (is_inline) { | |
927 switch (bc()) { | |
928 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
929 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
930 case Bytecodes::_invokestatic: | |
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931 case Bytecodes::_invokedynamic: |
0 | 932 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
933 default: fatal("unexpected call bytecode"); | |
934 } | |
935 } else { | |
936 switch (bc()) { | |
937 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
938 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
939 case Bytecodes::_invokestatic: | |
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940 case Bytecodes::_invokedynamic: |
0 | 941 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
942 default: fatal("unexpected call bytecode"); | |
943 } | |
944 } | |
945 } | |
946 } | |
947 #endif //PRODUCT | |
948 | |
949 | |
7478 | 950 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass, |
951 ciMethod* callee, const TypeOopPtr* receiver_type, | |
952 bool is_virtual, | |
953 bool& call_does_dispatch, int& vtable_index) { | |
954 // Set default values for out-parameters. | |
955 call_does_dispatch = true; | |
956 vtable_index = Method::invalid_vtable_index; | |
957 | |
958 // Choose call strategy. | |
959 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, receiver_type); | |
960 | |
961 // Have the call been sufficiently improved such that it is no longer a virtual? | |
962 if (optimized_virtual_method != NULL) { | |
963 callee = optimized_virtual_method; | |
964 call_does_dispatch = false; | |
965 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) { | |
966 // We can make a vtable call at this site | |
967 vtable_index = callee->resolve_vtable_index(caller->holder(), klass); | |
968 } | |
969 return callee; | |
970 } | |
971 | |
0 | 972 // Identify possible target method and inlining style |
7478 | 973 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, |
974 ciMethod* callee, const TypeOopPtr* receiver_type) { | |
0 | 975 // only use for virtual or interface calls |
976 | |
977 // If it is obviously final, do not bother to call find_monomorphic_target, | |
978 // because the class hierarchy checks are not needed, and may fail due to | |
979 // incompletely loaded classes. Since we do our own class loading checks | |
980 // in this module, we may confidently bind to any method. | |
7478 | 981 if (callee->can_be_statically_bound()) { |
982 return callee; | |
0 | 983 } |
984 | |
985 // Attempt to improve the receiver | |
986 bool actual_receiver_is_exact = false; | |
987 ciInstanceKlass* actual_receiver = klass; | |
988 if (receiver_type != NULL) { | |
989 // Array methods are all inherited from Object, and are monomorphic. | |
990 if (receiver_type->isa_aryptr() && | |
7478 | 991 callee->holder() == env()->Object_klass()) { |
992 return callee; | |
0 | 993 } |
994 | |
995 // All other interesting cases are instance klasses. | |
996 if (!receiver_type->isa_instptr()) { | |
997 return NULL; | |
998 } | |
999 | |
1000 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
1001 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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1002 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 1003 // ikl is a same or better type than the original actual_receiver, |
1004 // e.g. static receiver from bytecodes. | |
1005 actual_receiver = ikl; | |
1006 // Is the actual_receiver exact? | |
1007 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
1008 } | |
1009 } | |
1010 | |
1011 ciInstanceKlass* calling_klass = caller->holder(); | |
7478 | 1012 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver); |
0 | 1013 if (cha_monomorphic_target != NULL) { |
1014 assert(!cha_monomorphic_target->is_abstract(), ""); | |
1015 // Look at the method-receiver type. Does it add "too much information"? | |
1016 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
1017 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
1018 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
1019 // Calling this method would include an implicit cast to its holder. | |
1020 // %%% Not yet implemented. Would throw minor asserts at present. | |
1021 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
1022 // To fix, put the higher_equal check at the call of this routine, | |
1023 // and add a CheckCastPP to the receiver. | |
1024 if (TraceDependencies) { | |
1025 tty->print_cr("found unique CHA method, but could not cast up"); | |
1026 tty->print(" method = "); | |
1027 cha_monomorphic_target->print(); | |
1028 tty->cr(); | |
1029 } | |
7478 | 1030 if (log() != NULL) { |
1031 log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
1032 log()->identify(klass), | |
1033 log()->identify(cha_monomorphic_target)); | |
0 | 1034 } |
1035 cha_monomorphic_target = NULL; | |
1036 } | |
1037 } | |
1038 if (cha_monomorphic_target != NULL) { | |
1039 // Hardwiring a virtual. | |
1040 // If we inlined because CHA revealed only a single target method, | |
1041 // then we are dependent on that target method not getting overridden | |
1042 // by dynamic class loading. Be sure to test the "static" receiver | |
1043 // dest_method here, as opposed to the actual receiver, which may | |
1044 // falsely lead us to believe that the receiver is final or private. | |
7478 | 1045 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); |
0 | 1046 return cha_monomorphic_target; |
1047 } | |
1048 | |
1049 // If the type is exact, we can still bind the method w/o a vcall. | |
1050 // (This case comes after CHA so we can see how much extra work it does.) | |
1051 if (actual_receiver_is_exact) { | |
1052 // In case of evolution, there is a dependence on every inlined method, since each | |
1053 // such method can be changed when its class is redefined. | |
7478 | 1054 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver); |
0 | 1055 if (exact_method != NULL) { |
1056 #ifndef PRODUCT | |
1057 if (PrintOpto) { | |
1058 tty->print(" Calling method via exact type @%d --- ", bci); | |
1059 exact_method->print_name(); | |
1060 tty->cr(); | |
1061 } | |
1062 #endif | |
1063 return exact_method; | |
1064 } | |
1065 } | |
1066 | |
1067 return NULL; | |
1068 } |