Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 8071:bbc7936779f9
8006398: Add regression tests for deprectated GCs
Reviewed-by: ehelin, jwilhelm, jmasa
author | brutisso |
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date | Thu, 14 Feb 2013 09:11:43 +0100 |
parents | f1de9dbc914e |
children | 6f3fd5150b67 |
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) { |
6793 | 44 if (TraceTypeProfile || PrintInlining NOT_PRODUCT(|| PrintOptoInlining)) { |
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45 outputStream* out = tty; |
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46 if (!PrintInlining) { |
6793 | 47 if (NOT_PRODUCT(!PrintOpto &&) !PrintCompilation) { |
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48 method->print_short_name(); |
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49 tty->cr(); |
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50 } |
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51 CompileTask::print_inlining(prof_method, depth, bci); |
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52 } else { |
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53 out = C->print_inlining_stream(); |
0 | 54 } |
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55 CompileTask::print_inline_indent(depth, out); |
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56 out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); |
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57 stringStream ss; |
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58 prof_klass->name()->print_symbol_on(&ss); |
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59 out->print(ss.as_string()); |
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60 out->cr(); |
0 | 61 } |
62 } | |
63 | |
7478 | 64 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch, |
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65 JVMState* jvms, bool allow_inline, |
7473 | 66 float prof_factor, bool allow_intrinsics, bool delayed_forbidden) { |
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67 ciMethod* caller = jvms->method(); |
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68 int bci = jvms->bci(); |
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69 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); |
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70 guarantee(callee != NULL, "failed method resolution"); |
0 | 71 |
72 // Dtrace currently doesn't work unless all calls are vanilla | |
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73 if (env()->dtrace_method_probes()) { |
0 | 74 allow_inline = false; |
75 } | |
76 | |
77 // Note: When we get profiling during stage-1 compiles, we want to pull | |
78 // from more specific profile data which pertains to this inlining. | |
79 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
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80 ciCallProfile profile = caller->call_profile_at_bci(bci); |
0 | 81 |
82 // See how many times this site has been invoked. | |
83 int site_count = profile.count(); | |
84 int receiver_count = -1; | |
7478 | 85 if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) { |
0 | 86 // Receivers in the profile structure are ordered by call counts |
87 // so that the most called (major) receiver is profile.receiver(0). | |
88 receiver_count = profile.receiver_count(0); | |
89 } | |
90 | |
91 CompileLog* log = this->log(); | |
92 if (log != NULL) { | |
93 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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94 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
0 | 95 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
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96 log->identify(callee), site_count, prof_factor); |
7478 | 97 if (call_does_dispatch) log->print(" virtual='1'"); |
0 | 98 if (allow_inline) log->print(" inline='1'"); |
99 if (receiver_count >= 0) { | |
100 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
101 if (profile.has_receiver(1)) { | |
102 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
103 } | |
104 } | |
105 log->end_elem(); | |
106 } | |
107 | |
108 // Special case the handling of certain common, profitable library | |
109 // methods. If these methods are replaced with specialized code, | |
110 // then we return it as the inlined version of the call. | |
111 // We do this before the strict f.p. check below because the | |
112 // intrinsics handle strict f.p. correctly. | |
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113 if (allow_inline && allow_intrinsics) { |
7478 | 114 CallGenerator* cg = find_intrinsic(callee, call_does_dispatch); |
6894 | 115 if (cg != NULL) { |
116 if (cg->is_predicted()) { | |
117 // Code without intrinsic but, hopefully, inlined. | |
118 CallGenerator* inline_cg = this->call_generator(callee, | |
7478 | 119 vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, false); |
6894 | 120 if (inline_cg != NULL) { |
121 cg = CallGenerator::for_predicted_intrinsic(cg, inline_cg); | |
122 } | |
123 } | |
124 return cg; | |
125 } | |
0 | 126 } |
127 | |
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128 // Do method handle calls. |
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129 // NOTE: This must happen before normal inlining logic below since |
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130 // MethodHandle.invoke* are native methods which obviously don't |
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131 // have bytecodes and so normal inlining fails. |
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132 if (callee->is_method_handle_intrinsic()) { |
7473 | 133 CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, delayed_forbidden); |
7478 | 134 assert(cg == NULL || !delayed_forbidden || !cg->is_late_inline() || cg->is_mh_late_inline(), "unexpected CallGenerator"); |
7473 | 135 return cg; |
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136 } |
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137 |
0 | 138 // Do not inline strict fp into non-strict code, or the reverse |
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139 if (caller->is_strict() ^ callee->is_strict()) { |
0 | 140 allow_inline = false; |
141 } | |
142 | |
143 // Attempt to inline... | |
144 if (allow_inline) { | |
145 // The profile data is only partly attributable to this caller, | |
146 // scale back the call site information. | |
147 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
148 // This is the number of times we expect the call code to be used. | |
149 float expected_uses = past_uses; | |
150 | |
151 // Try inlining a bytecoded method: | |
7478 | 152 if (!call_does_dispatch) { |
0 | 153 InlineTree* ilt; |
154 if (UseOldInlining) { | |
155 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
156 } else { | |
157 // Make a disembodied, stateless ILT. | |
158 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
159 float site_invoke_ratio = prof_factor; | |
160 // Note: ilt is for the root of this parse, not the present call site. | |
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161 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel); |
0 | 162 } |
163 WarmCallInfo scratch_ci; | |
164 if (!UseOldInlining) | |
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165 scratch_ci.init(jvms, callee, profile, prof_factor); |
7473 | 166 bool should_delay = false; |
167 WarmCallInfo* ci = ilt->ok_to_inline(callee, jvms, profile, &scratch_ci, should_delay); | |
0 | 168 assert(ci != &scratch_ci, "do not let this pointer escape"); |
169 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
170 bool require_inline = (allow_inline && ci->is_hot()); | |
171 | |
172 if (allow_inline) { | |
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173 CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses); |
7473 | 174 |
175 if (require_inline && cg != NULL) { | |
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176 // Delay the inlining of this method to give us the |
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177 // opportunity to perform some high level optimizations |
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178 // first. |
7473 | 179 if (should_delay_inlining(callee, jvms)) { |
180 assert(!delayed_forbidden, "strange"); | |
181 return CallGenerator::for_string_late_inline(callee, cg); | |
182 } else if ((should_delay || AlwaysIncrementalInline) && !delayed_forbidden) { | |
183 return CallGenerator::for_late_inline(callee, cg); | |
184 } | |
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185 } |
7473 | 186 if (cg == NULL || should_delay) { |
0 | 187 // Fall through. |
188 } else if (require_inline || !InlineWarmCalls) { | |
189 return cg; | |
190 } else { | |
7478 | 191 CallGenerator* cold_cg = call_generator(callee, vtable_index, call_does_dispatch, jvms, false, prof_factor); |
0 | 192 return CallGenerator::for_warm_call(ci, cold_cg, cg); |
193 } | |
194 } | |
195 } | |
196 | |
197 // Try using the type profile. | |
7478 | 198 if (call_does_dispatch && site_count > 0 && receiver_count > 0) { |
0 | 199 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. |
200 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
201 ciMethod* receiver_method = NULL; | |
202 if (have_major_receiver || profile.morphism() == 1 || | |
203 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
204 // receiver_method = profile.method(); | |
205 // Profiles do not suggest methods now. Look it up in the major receiver. | |
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206 receiver_method = callee->resolve_invoke(jvms->method()->holder(), |
0 | 207 profile.receiver(0)); |
208 } | |
209 if (receiver_method != NULL) { | |
210 // The single majority receiver sufficiently outweighs the minority. | |
211 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
7478 | 212 vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor); |
0 | 213 if (hit_cg != NULL) { |
214 // Look up second receiver. | |
215 CallGenerator* next_hit_cg = NULL; | |
216 ciMethod* next_receiver_method = NULL; | |
217 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
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218 next_receiver_method = callee->resolve_invoke(jvms->method()->holder(), |
0 | 219 profile.receiver(1)); |
220 if (next_receiver_method != NULL) { | |
221 next_hit_cg = this->call_generator(next_receiver_method, | |
7478 | 222 vtable_index, !call_does_dispatch, jvms, |
0 | 223 allow_inline, prof_factor); |
224 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
225 have_major_receiver && UseOnlyInlinedBimorphic) { | |
226 // Skip if we can't inline second receiver's method | |
227 next_hit_cg = NULL; | |
228 } | |
229 } | |
230 } | |
231 CallGenerator* miss_cg; | |
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232 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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233 Deoptimization::Reason_bimorphic : |
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234 Deoptimization::Reason_class_check; |
0 | 235 if (( profile.morphism() == 1 || |
236 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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237 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 238 ) { |
239 // Generate uncommon trap for class check failure path | |
240 // in case of monomorphic or bimorphic virtual call site. | |
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241 miss_cg = CallGenerator::for_uncommon_trap(callee, reason, |
0 | 242 Deoptimization::Action_maybe_recompile); |
243 } else { | |
244 // Generate virtual call for class check failure path | |
245 // in case of polymorphic virtual call site. | |
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246 miss_cg = CallGenerator::for_virtual_call(callee, vtable_index); |
0 | 247 } |
248 if (miss_cg != NULL) { | |
249 if (next_hit_cg != NULL) { | |
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250 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1)); |
0 | 251 // We don't need to record dependency on a receiver here and below. |
252 // Whenever we inline, the dependency is added by Parse::Parse(). | |
253 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
254 } | |
255 if (miss_cg != NULL) { | |
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256 trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count); |
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257 CallGenerator* cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
0 | 258 if (cg != NULL) return cg; |
259 } | |
260 } | |
261 } | |
262 } | |
263 } | |
264 } | |
265 | |
266 // There was no special inlining tactic, or it bailed out. | |
267 // Use a more generic tactic, like a simple call. | |
7478 | 268 if (call_does_dispatch) { |
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269 return CallGenerator::for_virtual_call(callee, vtable_index); |
0 | 270 } else { |
271 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
272 // or it is a static or special call. | |
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273 return CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms)); |
0 | 274 } |
275 } | |
276 | |
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277 // Return true for methods that shouldn't be inlined early so that |
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278 // they are easier to analyze and optimize as intrinsics. |
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279 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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280 if (has_stringbuilder()) { |
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281 |
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282 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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283 call_method->holder() == C->env()->StringBuffer_klass()) && |
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284 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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285 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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286 // Delay SB calls only when called from non-SB code |
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287 return false; |
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288 } |
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289 |
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290 switch (call_method->intrinsic_id()) { |
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291 case vmIntrinsics::_StringBuilder_void: |
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292 case vmIntrinsics::_StringBuilder_int: |
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293 case vmIntrinsics::_StringBuilder_String: |
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294 case vmIntrinsics::_StringBuilder_append_char: |
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295 case vmIntrinsics::_StringBuilder_append_int: |
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296 case vmIntrinsics::_StringBuilder_append_String: |
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297 case vmIntrinsics::_StringBuilder_toString: |
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298 case vmIntrinsics::_StringBuffer_void: |
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299 case vmIntrinsics::_StringBuffer_int: |
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300 case vmIntrinsics::_StringBuffer_String: |
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301 case vmIntrinsics::_StringBuffer_append_char: |
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302 case vmIntrinsics::_StringBuffer_append_int: |
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303 case vmIntrinsics::_StringBuffer_append_String: |
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304 case vmIntrinsics::_StringBuffer_toString: |
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305 case vmIntrinsics::_Integer_toString: |
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306 return true; |
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307 |
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308 case vmIntrinsics::_String_String: |
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309 { |
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310 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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311 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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312 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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313 ciMethod* m = csj->method(); |
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314 if (m != NULL && |
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315 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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316 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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317 // Delay String.<init>(new SB()) |
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318 return true; |
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319 } |
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320 return false; |
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321 } |
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322 |
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323 default: |
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324 return false; |
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325 } |
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326 } |
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327 return false; |
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328 } |
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329 |
0 | 330 |
331 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
332 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
333 // Additional inputs to consider... | |
334 // bc = bc() | |
335 // caller = method() | |
336 // iter().get_method_holder_index() | |
337 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
338 // Interface classes can be loaded & linked and never get around to | |
339 // being initialized. Uncommon-trap for not-initialized static or | |
340 // v-calls. Let interface calls happen. | |
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341 ciInstanceKlass* holder_klass = dest_method->holder(); |
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342 if (!holder_klass->is_being_initialized() && |
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343 !holder_klass->is_initialized() && |
0 | 344 !holder_klass->is_interface()) { |
345 uncommon_trap(Deoptimization::Reason_uninitialized, | |
346 Deoptimization::Action_reinterpret, | |
347 holder_klass); | |
348 return true; | |
349 } | |
350 | |
6973 | 351 assert(dest_method->is_loaded(), "dest_method: typeflow responsibility"); |
0 | 352 return false; |
353 } | |
354 | |
355 | |
356 //------------------------------do_call---------------------------------------- | |
357 // Handle your basic call. Inline if we can & want to, else just setup call. | |
358 void Parse::do_call() { | |
359 // It's likely we are going to add debug info soon. | |
360 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
361 // our contribution to it is cleaned up right here. | |
362 kill_dead_locals(); | |
363 | |
364 // Set frequently used booleans | |
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365 const bool is_virtual = bc() == Bytecodes::_invokevirtual; |
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366 const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; |
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367 const bool has_receiver = Bytecodes::has_receiver(bc()); |
0 | 368 |
369 // Find target being called | |
370 bool will_link; | |
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371 ciSignature* declared_signature = NULL; |
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372 ciMethod* orig_callee = iter().get_method(will_link, &declared_signature); // callee in the bytecode |
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373 ciInstanceKlass* holder_klass = orig_callee->holder(); |
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374 ciKlass* holder = iter().get_declared_method_holder(); |
0 | 375 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); |
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376 assert(declared_signature != NULL, "cannot be null"); |
0 | 377 |
378 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
379 // bailout when too many arguments for register representation | |
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380 if (!will_link || can_not_compile_call_site(orig_callee, klass)) { |
0 | 381 #ifndef PRODUCT |
382 if (PrintOpto && (Verbose || WizardMode)) { | |
383 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
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384 orig_callee->print_name(); tty->cr(); |
0 | 385 } |
386 #endif | |
387 return; | |
388 } | |
389 assert(holder_klass->is_loaded(), ""); | |
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390 //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); // XXX invokehandle (cur_bc_raw) |
0 | 391 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
392 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
393 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
394 // Note: In the absence of miranda methods, an abstract class K can perform | |
395 // an invokevirtual directly on an interface method I.m if K implements I. | |
396 | |
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397 // orig_callee is the resolved callee which's signature includes the |
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398 // appendix argument. |
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399 const int nargs = orig_callee->arg_size(); |
7478 | 400 const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id()); |
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401 |
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402 // Push appendix argument (MethodType, CallSite, etc.), if one. |
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403 if (iter().has_appendix()) { |
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404 ciObject* appendix_arg = iter().get_appendix(); |
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405 const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg); |
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406 Node* appendix_arg_node = _gvn.makecon(appendix_arg_type); |
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407 push(appendix_arg_node); |
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408 } |
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409 |
0 | 410 // --------------------- |
411 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
412 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
413 // Does the call-site type profile reveal only one receiver? | |
414 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
415 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
416 | |
7478 | 417 // Try to get the most accurate receiver type |
418 ciMethod* callee = orig_callee; | |
419 int vtable_index = Method::invalid_vtable_index; | |
420 bool call_does_dispatch = false; | |
0 | 421 |
422 if (is_virtual_or_interface) { | |
423 Node* receiver_node = stack(sp() - nargs); | |
424 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
7478 | 425 // call_does_dispatch and vtable_index are out-parameters. They might be changed. |
426 callee = C->optimize_virtual_call(method(), bci(), klass, orig_callee, receiver_type, | |
427 is_virtual, | |
428 call_does_dispatch, vtable_index); // out-parameters | |
0 | 429 } |
430 | |
431 // Note: It's OK to try to inline a virtual call. | |
432 // The call generator will not attempt to inline a polymorphic call | |
433 // unless it knows how to optimize the receiver dispatch. | |
434 bool try_inline = (C->do_inlining() || InlineAccessors); | |
435 | |
436 // --------------------- | |
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437 dec_sp(nargs); // Temporarily pop args for JVM state of call |
0 | 438 JVMState* jvms = sync_jvms(); |
439 | |
440 // --------------------- | |
441 // Decide call tactic. | |
442 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
443 // It decides whether inlining is desirable or not. | |
7478 | 444 CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor()); |
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445 |
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446 // NOTE: Don't use orig_callee and callee after this point! Use cg->method() instead. |
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447 orig_callee = callee = NULL; |
0 | 448 |
449 // --------------------- | |
450 // Round double arguments before call | |
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451 round_double_arguments(cg->method()); |
0 | 452 |
453 #ifndef PRODUCT | |
454 // bump global counters for calls | |
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455 count_compiled_calls(/*at_method_entry*/ false, cg->is_inline()); |
0 | 456 |
457 // Record first part of parsing work for this call | |
458 parse_histogram()->record_change(); | |
459 #endif // not PRODUCT | |
460 | |
461 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
462 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
463 | |
464 // save across call, for a subsequent cast_not_null. | |
465 Node* receiver = has_receiver ? argument(0) : NULL; | |
466 | |
467 // Bump method data counters (We profile *before* the call is made | |
468 // because exceptions don't return to the call site.) | |
469 profile_call(receiver); | |
470 | |
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471 JVMState* new_jvms = cg->generate(jvms); |
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472 if (new_jvms == NULL) { |
0 | 473 // When inlining attempt fails (e.g., too many arguments), |
474 // it may contaminate the current compile state, making it | |
475 // impossible to pull back and try again. Once we call | |
476 // cg->generate(), we are committed. If it fails, the whole | |
477 // compilation task is compromised. | |
478 if (failing()) return; | |
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479 |
0 | 480 // This can happen if a library intrinsic is available, but refuses |
481 // the call site, perhaps because it did not match a pattern the | |
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482 // intrinsic was expecting to optimize. Should always be possible to |
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483 // get a normal java call that may inline in that case |
7478 | 484 cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), /* allow_intrinsics= */ false); |
0 | 485 if ((new_jvms = cg->generate(jvms)) == NULL) { |
486 guarantee(failing(), "call failed to generate: calls should work"); | |
487 return; | |
488 } | |
489 } | |
490 | |
491 if (cg->is_inline()) { | |
67 | 492 // Accumulate has_loops estimate |
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493 C->set_has_loops(C->has_loops() || cg->method()->has_loops()); |
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494 C->env()->notice_inlined_method(cg->method()); |
0 | 495 } |
496 | |
497 // Reset parser state from [new_]jvms, which now carries results of the call. | |
498 // Return value (if any) is already pushed on the stack by the cg. | |
499 add_exception_states_from(new_jvms); | |
500 if (new_jvms->map()->control() == top()) { | |
501 stop_and_kill_map(); | |
502 } else { | |
503 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
504 set_jvms(new_jvms); | |
505 } | |
506 | |
507 if (!stopped()) { | |
508 // This was some sort of virtual call, which did a null check for us. | |
509 // Now we can assert receiver-not-null, on the normal return path. | |
510 if (receiver != NULL && cg->is_virtual()) { | |
511 Node* cast = cast_not_null(receiver); | |
512 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
513 } | |
514 | |
515 // Round double result after a call from strict to non-strict code | |
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516 round_double_result(cg->method()); |
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517 |
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518 ciType* rtype = cg->method()->return_type(); |
7478 | 519 ciType* ctype = declared_signature->return_type(); |
520 | |
521 if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) { | |
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522 // Be careful here with return types. |
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523 if (ctype != rtype) { |
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524 BasicType rt = rtype->basic_type(); |
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525 BasicType ct = ctype->basic_type(); |
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526 if (ct == T_VOID) { |
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527 // It's OK for a method to return a value that is discarded. |
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528 // The discarding does not require any special action from the caller. |
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529 // The Java code knows this, at VerifyType.isNullConversion. |
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530 pop_node(rt); // whatever it was, pop it |
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531 } else if (rt == T_INT || is_subword_type(rt)) { |
7478 | 532 // Nothing. These cases are handled in lambda form bytecode. |
533 assert(ct == T_INT || is_subword_type(ct), err_msg_res("must match: rt=%s, ct=%s", type2name(rt), type2name(ct))); | |
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534 } else if (rt == T_OBJECT || rt == T_ARRAY) { |
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535 assert(ct == T_OBJECT || ct == T_ARRAY, err_msg_res("rt=%s, ct=%s", type2name(rt), type2name(ct))); |
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536 if (ctype->is_loaded()) { |
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537 const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass()); |
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538 const Type* sig_type = TypeOopPtr::make_from_klass(ctype->as_klass()); |
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539 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) { |
7478 | 540 Node* retnode = pop(); |
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541 Node* cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), retnode, sig_type)); |
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542 push(cast_obj); |
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543 } |
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544 } |
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545 } else { |
7478 | 546 assert(rt == ct, err_msg_res("unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct))); |
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547 // push a zero; it's better than getting an oop/int mismatch |
7478 | 548 pop_node(rt); |
549 Node* retnode = zerocon(ct); | |
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550 push_node(ct, retnode); |
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551 } |
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552 // Now that the value is well-behaved, continue with the call-site type. |
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553 rtype = ctype; |
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554 } |
7478 | 555 } else { |
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556 // Symbolic resolution enforces the types to be the same. |
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557 // NOTE: We must relax the assert for unloaded types because two |
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558 // different ciType instances of the same unloaded class type |
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559 // can appear to be "loaded" by different loaders (depending on |
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560 // the accessing class). |
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561 assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype, |
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562 err_msg_res("mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name())); |
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563 } |
0 | 564 |
565 // If the return type of the method is not loaded, assert that the | |
566 // value we got is a null. Otherwise, we need to recompile. | |
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567 if (!rtype->is_loaded()) { |
0 | 568 #ifndef PRODUCT |
569 if (PrintOpto && (Verbose || WizardMode)) { | |
570 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
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571 cg->method()->print_name(); tty->cr(); |
0 | 572 } |
573 #endif | |
574 if (C->log() != NULL) { | |
575 C->log()->elem("assert_null reason='return' klass='%d'", | |
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576 C->log()->identify(rtype)); |
0 | 577 } |
578 // If there is going to be a trap, put it at the next bytecode: | |
579 set_bci(iter().next_bci()); | |
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580 null_assert(peek()); |
0 | 581 set_bci(iter().cur_bci()); // put it back |
582 } | |
583 } | |
584 | |
585 // Restart record of parsing work after possible inlining of call | |
586 #ifndef PRODUCT | |
587 parse_histogram()->set_initial_state(bc()); | |
588 #endif | |
589 } | |
590 | |
591 //---------------------------catch_call_exceptions----------------------------- | |
592 // Put a Catch and CatchProj nodes behind a just-created call. | |
593 // Send their caught exceptions to the proper handler. | |
594 // This may be used after a call to the rethrow VM stub, | |
595 // when it is needed to process unloaded exception classes. | |
596 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
597 // Exceptions are delivered through this channel: | |
598 Node* i_o = this->i_o(); | |
599 | |
600 // Add a CatchNode. | |
601 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
602 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
603 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
604 | |
605 for (; !handlers.is_done(); handlers.next()) { | |
606 ciExceptionHandler* h = handlers.handler(); | |
607 int h_bci = h->handler_bci(); | |
608 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
609 // Do not introduce unloaded exception types into the graph: | |
610 if (!h_klass->is_loaded()) { | |
611 if (saw_unloaded->contains(h_bci)) { | |
612 /* We've already seen an unloaded exception with h_bci, | |
613 so don't duplicate. Duplication will cause the CatchNode to be | |
614 unnecessarily large. See 4713716. */ | |
615 continue; | |
616 } else { | |
617 saw_unloaded->append(h_bci); | |
618 } | |
619 } | |
620 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
621 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
622 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
623 assert(!h_extype->empty(), "sanity"); | |
624 // Note: It's OK if the BCIs repeat themselves. | |
625 bcis->append(h_bci); | |
626 extypes->append(h_extype); | |
627 } | |
628 | |
629 int len = bcis->length(); | |
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630 CatchNode *cn = new (C) CatchNode(control(), i_o, len+1); |
0 | 631 Node *catch_ = _gvn.transform(cn); |
632 | |
633 // now branch with the exception state to each of the (potential) | |
634 // handlers | |
635 for(int i=0; i < len; i++) { | |
636 // Setup JVM state to enter the handler. | |
637 PreserveJVMState pjvms(this); | |
638 // Locals are just copied from before the call. | |
639 // Get control from the CatchNode. | |
640 int handler_bci = bcis->at(i); | |
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641 Node* ctrl = _gvn.transform( new (C) CatchProjNode(catch_, i+1,handler_bci)); |
0 | 642 // This handler cannot happen? |
643 if (ctrl == top()) continue; | |
644 set_control(ctrl); | |
645 | |
646 // Create exception oop | |
647 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
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648 Node *ex_oop = _gvn.transform(new (C) CreateExNode(extypes->at(i), ctrl, i_o)); |
0 | 649 |
650 // Handle unloaded exception classes. | |
651 if (saw_unloaded->contains(handler_bci)) { | |
652 // An unloaded exception type is coming here. Do an uncommon trap. | |
653 #ifndef PRODUCT | |
654 // We do not expect the same handler bci to take both cold unloaded | |
655 // and hot loaded exceptions. But, watch for it. | |
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656 if ((Verbose || WizardMode) && extype->is_loaded()) { |
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657 tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci()); |
0 | 658 method()->print_name(); tty->cr(); |
659 } else if (PrintOpto && (Verbose || WizardMode)) { | |
660 tty->print("Bailing out on unloaded exception type "); | |
661 extype->klass()->print_name(); | |
662 tty->print(" at bci:%d in ", bci()); | |
663 method()->print_name(); tty->cr(); | |
664 } | |
665 #endif | |
666 // Emit an uncommon trap instead of processing the block. | |
667 set_bci(handler_bci); | |
668 push_ex_oop(ex_oop); | |
669 uncommon_trap(Deoptimization::Reason_unloaded, | |
670 Deoptimization::Action_reinterpret, | |
671 extype->klass(), "!loaded exception"); | |
672 set_bci(iter().cur_bci()); // put it back | |
673 continue; | |
674 } | |
675 | |
676 // go to the exception handler | |
677 if (handler_bci < 0) { // merge with corresponding rethrow node | |
678 throw_to_exit(make_exception_state(ex_oop)); | |
679 } else { // Else jump to corresponding handle | |
680 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
681 merge_exception(handler_bci); | |
682 } | |
683 } | |
684 | |
685 // The first CatchProj is for the normal return. | |
686 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
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687 set_control(_gvn.transform( new (C) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); |
0 | 688 } |
689 | |
690 | |
691 //----------------------------catch_inline_exceptions-------------------------- | |
692 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
693 // Common case 1: we have no handler, so all exceptions merge right into | |
694 // the rethrow case. | |
695 // Case 2: we have some handlers, with loaded exception klasses that have | |
696 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
697 // exception oop and branch to the handler directly. | |
698 // Case 3: We have some handlers with subklasses or are not loaded at | |
699 // compile-time. We have to call the runtime to resolve the exception. | |
700 // So we insert a RethrowCall and all the logic that goes with it. | |
701 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
702 // Caller is responsible for saving away the map for normal control flow! | |
703 assert(stopped(), "call set_map(NULL) first"); | |
704 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
705 | |
706 Node* ex_node = saved_ex_oop(ex_map); | |
707 if (ex_node == top()) { | |
708 // No action needed. | |
709 return; | |
710 } | |
711 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
712 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
713 if (ex_type == NULL) | |
714 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
715 | |
716 // determine potential exception handlers | |
717 ciExceptionHandlerStream handlers(method(), bci(), | |
718 ex_type->klass()->as_instance_klass(), | |
719 ex_type->klass_is_exact()); | |
720 | |
721 // Start executing from the given throw state. (Keep its stack, for now.) | |
722 // Get the exception oop as known at compile time. | |
723 ex_node = use_exception_state(ex_map); | |
724 | |
725 // Get the exception oop klass from its header | |
726 Node* ex_klass_node = NULL; | |
727 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
728 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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729 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 730 |
731 // Compute the exception klass a little more cleverly. | |
732 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
733 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
734 // each arm of the Phi. If I know something clever about the exceptions | |
735 // I'm loading the class from, I can replace the LoadKlass with the | |
736 // klass constant for the exception oop. | |
737 if( ex_node->is_Phi() ) { | |
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738 ex_klass_node = new (C) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); |
0 | 739 for( uint i = 1; i < ex_node->req(); i++ ) { |
740 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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741 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 742 ex_klass_node->init_req( i, k ); |
743 } | |
744 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
745 | |
746 } | |
747 } | |
748 | |
749 // Scan the exception table for applicable handlers. | |
750 // If none, we can call rethrow() and be done! | |
751 // If precise (loaded with no subklasses), insert a D.S. style | |
752 // pointer compare to the correct handler and loop back. | |
753 // If imprecise, switch to the Rethrow VM-call style handling. | |
754 | |
755 int remaining = handlers.count_remaining(); | |
756 | |
757 // iterate through all entries sequentially | |
758 for (;!handlers.is_done(); handlers.next()) { | |
759 ciExceptionHandler* handler = handlers.handler(); | |
760 | |
761 if (handler->is_rethrow()) { | |
762 // If we fell off the end of the table without finding an imprecise | |
763 // exception klass (and without finding a generic handler) then we | |
764 // know this exception is not handled in this method. We just rethrow | |
765 // the exception into the caller. | |
766 throw_to_exit(make_exception_state(ex_node)); | |
767 return; | |
768 } | |
769 | |
770 // exception handler bci range covers throw_bci => investigate further | |
771 int handler_bci = handler->handler_bci(); | |
772 | |
773 if (remaining == 1) { | |
774 push_ex_oop(ex_node); // Push exception oop for handler | |
775 #ifndef PRODUCT | |
776 if (PrintOpto && WizardMode) { | |
777 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
778 } | |
779 #endif | |
780 merge_exception(handler_bci); // jump to handler | |
781 return; // No more handling to be done here! | |
782 } | |
783 | |
1344 | 784 // Get the handler's klass |
0 | 785 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 786 |
787 if (!klass->is_loaded()) { // klass is not loaded? | |
788 // fall through into catch_call_exceptions which will emit a | |
789 // handler with an uncommon trap. | |
790 break; | |
0 | 791 } |
792 | |
793 if (klass->is_interface()) // should not happen, but... | |
794 break; // bail out | |
795 | |
1344 | 796 // Check the type of the exception against the catch type |
0 | 797 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
798 Node* con = _gvn.makecon(tk); | |
1344 | 799 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
800 if (!stopped()) { | |
801 PreserveJVMState pjvms(this); | |
802 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
803 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
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804 Node* ex_oop = _gvn.transform(new (C) CheckCastPPNode(control(), ex_node, tinst)); |
0 | 805 push_ex_oop(ex_oop); // Push exception oop for handler |
806 #ifndef PRODUCT | |
807 if (PrintOpto && WizardMode) { | |
808 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
809 klass->print_name(); | |
810 tty->cr(); | |
811 } | |
812 #endif | |
813 merge_exception(handler_bci); | |
814 } | |
1344 | 815 set_control(not_subtype_ctrl); |
0 | 816 |
817 // Come here if exception does not match handler. | |
818 // Carry on with more handler checks. | |
819 --remaining; | |
820 } | |
821 | |
822 assert(!stopped(), "you should return if you finish the chain"); | |
823 | |
824 // Oops, need to call into the VM to resolve the klasses at runtime. | |
825 // Note: This call must not deoptimize, since it is not a real at this bci! | |
826 kill_dead_locals(); | |
827 | |
828 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
829 OptoRuntime::rethrow_Type(), | |
830 OptoRuntime::rethrow_stub(), | |
831 NULL, NULL, | |
832 ex_node); | |
833 | |
834 // Rethrow is a pure call, no side effects, only a result. | |
835 // The result cannot be allocated, so we use I_O | |
836 | |
837 // Catch exceptions from the rethrow | |
838 catch_call_exceptions(handlers); | |
839 } | |
840 | |
841 | |
842 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
843 | |
844 | |
845 #ifndef PRODUCT | |
846 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
847 if( CountCompiledCalls ) { | |
848 if( at_method_entry ) { | |
849 // bump invocation counter if top method (for statistics) | |
850 if (CountCompiledCalls && depth() == 1) { | |
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851 const TypePtr* addr_type = TypeMetadataPtr::make(method()); |
0 | 852 Node* adr1 = makecon(addr_type); |
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853 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset())); |
0 | 854 increment_counter(adr2); |
855 } | |
856 } else if (is_inline) { | |
857 switch (bc()) { | |
858 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
859 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
860 case Bytecodes::_invokestatic: | |
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861 case Bytecodes::_invokedynamic: |
0 | 862 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
863 default: fatal("unexpected call bytecode"); | |
864 } | |
865 } else { | |
866 switch (bc()) { | |
867 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
868 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
869 case Bytecodes::_invokestatic: | |
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870 case Bytecodes::_invokedynamic: |
0 | 871 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
872 default: fatal("unexpected call bytecode"); | |
873 } | |
874 } | |
875 } | |
876 } | |
877 #endif //PRODUCT | |
878 | |
879 | |
7478 | 880 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, int bci, ciInstanceKlass* klass, |
881 ciMethod* callee, const TypeOopPtr* receiver_type, | |
882 bool is_virtual, | |
883 bool& call_does_dispatch, int& vtable_index) { | |
884 // Set default values for out-parameters. | |
885 call_does_dispatch = true; | |
886 vtable_index = Method::invalid_vtable_index; | |
887 | |
888 // Choose call strategy. | |
889 ciMethod* optimized_virtual_method = optimize_inlining(caller, bci, klass, callee, receiver_type); | |
890 | |
891 // Have the call been sufficiently improved such that it is no longer a virtual? | |
892 if (optimized_virtual_method != NULL) { | |
893 callee = optimized_virtual_method; | |
894 call_does_dispatch = false; | |
895 } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) { | |
896 // We can make a vtable call at this site | |
897 vtable_index = callee->resolve_vtable_index(caller->holder(), klass); | |
898 } | |
899 return callee; | |
900 } | |
901 | |
0 | 902 // Identify possible target method and inlining style |
7478 | 903 ciMethod* Compile::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, |
904 ciMethod* callee, const TypeOopPtr* receiver_type) { | |
0 | 905 // only use for virtual or interface calls |
906 | |
907 // If it is obviously final, do not bother to call find_monomorphic_target, | |
908 // because the class hierarchy checks are not needed, and may fail due to | |
909 // incompletely loaded classes. Since we do our own class loading checks | |
910 // in this module, we may confidently bind to any method. | |
7478 | 911 if (callee->can_be_statically_bound()) { |
912 return callee; | |
0 | 913 } |
914 | |
915 // Attempt to improve the receiver | |
916 bool actual_receiver_is_exact = false; | |
917 ciInstanceKlass* actual_receiver = klass; | |
918 if (receiver_type != NULL) { | |
919 // Array methods are all inherited from Object, and are monomorphic. | |
920 if (receiver_type->isa_aryptr() && | |
7478 | 921 callee->holder() == env()->Object_klass()) { |
922 return callee; | |
0 | 923 } |
924 | |
925 // All other interesting cases are instance klasses. | |
926 if (!receiver_type->isa_instptr()) { | |
927 return NULL; | |
928 } | |
929 | |
930 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
931 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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932 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 933 // ikl is a same or better type than the original actual_receiver, |
934 // e.g. static receiver from bytecodes. | |
935 actual_receiver = ikl; | |
936 // Is the actual_receiver exact? | |
937 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
938 } | |
939 } | |
940 | |
941 ciInstanceKlass* calling_klass = caller->holder(); | |
7478 | 942 ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver); |
0 | 943 if (cha_monomorphic_target != NULL) { |
944 assert(!cha_monomorphic_target->is_abstract(), ""); | |
945 // Look at the method-receiver type. Does it add "too much information"? | |
946 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
947 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
948 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
949 // Calling this method would include an implicit cast to its holder. | |
950 // %%% Not yet implemented. Would throw minor asserts at present. | |
951 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
952 // To fix, put the higher_equal check at the call of this routine, | |
953 // and add a CheckCastPP to the receiver. | |
954 if (TraceDependencies) { | |
955 tty->print_cr("found unique CHA method, but could not cast up"); | |
956 tty->print(" method = "); | |
957 cha_monomorphic_target->print(); | |
958 tty->cr(); | |
959 } | |
7478 | 960 if (log() != NULL) { |
961 log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
962 log()->identify(klass), | |
963 log()->identify(cha_monomorphic_target)); | |
0 | 964 } |
965 cha_monomorphic_target = NULL; | |
966 } | |
967 } | |
968 if (cha_monomorphic_target != NULL) { | |
969 // Hardwiring a virtual. | |
970 // If we inlined because CHA revealed only a single target method, | |
971 // then we are dependent on that target method not getting overridden | |
972 // by dynamic class loading. Be sure to test the "static" receiver | |
973 // dest_method here, as opposed to the actual receiver, which may | |
974 // falsely lead us to believe that the receiver is final or private. | |
7478 | 975 dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); |
0 | 976 return cha_monomorphic_target; |
977 } | |
978 | |
979 // If the type is exact, we can still bind the method w/o a vcall. | |
980 // (This case comes after CHA so we can see how much extra work it does.) | |
981 if (actual_receiver_is_exact) { | |
982 // In case of evolution, there is a dependence on every inlined method, since each | |
983 // such method can be changed when its class is redefined. | |
7478 | 984 ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver); |
0 | 985 if (exact_method != NULL) { |
986 #ifndef PRODUCT | |
987 if (PrintOpto) { | |
988 tty->print(" Calling method via exact type @%d --- ", bci); | |
989 exact_method->print_name(); | |
990 tty->cr(); | |
991 } | |
992 #endif | |
993 return exact_method; | |
994 } | |
995 } | |
996 | |
997 return NULL; | |
998 } |