Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 4142:bc8527f3071c
Adjust code base to new level of warnings.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 18 Dec 2011 05:24:06 +0100 |
parents | a04a201f0f5a |
children | b40ac3579043 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciCPCache.hpp" | |
27 #include "ci/ciCallSite.hpp" | |
28 #include "ci/ciMethodHandle.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
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30 #include "compiler/compileBroker.hpp" |
1972 | 31 #include "compiler/compileLog.hpp" |
32 #include "interpreter/linkResolver.hpp" | |
33 #include "opto/addnode.hpp" | |
34 #include "opto/callGenerator.hpp" | |
35 #include "opto/cfgnode.hpp" | |
36 #include "opto/mulnode.hpp" | |
37 #include "opto/parse.hpp" | |
38 #include "opto/rootnode.hpp" | |
39 #include "opto/runtime.hpp" | |
40 #include "opto/subnode.hpp" | |
41 #include "prims/nativeLookup.hpp" | |
42 #include "runtime/sharedRuntime.hpp" | |
0 | 43 |
44 #ifndef PRODUCT | |
45 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) { | |
46 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) { | |
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47 if (!PrintInlining) { |
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48 if (!PrintOpto && !PrintCompilation) { |
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49 method->print_short_name(); |
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50 tty->cr(); |
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51 } |
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52 CompileTask::print_inlining(prof_method, depth, bci); |
0 | 53 } |
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54 CompileTask::print_inline_indent(depth); |
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55 tty->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); |
0 | 56 prof_klass->name()->print_symbol(); |
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57 tty->cr(); |
0 | 58 } |
59 } | |
60 #endif | |
61 | |
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62 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual, |
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63 JVMState* jvms, bool allow_inline, |
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64 float prof_factor) { |
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65 ciMethod* caller = jvms->method(); |
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66 int bci = jvms->bci(); |
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67 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); |
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68 guarantee(call_method != NULL, "failed method resolution"); |
0 | 69 |
70 // Dtrace currently doesn't work unless all calls are vanilla | |
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71 if (env()->dtrace_method_probes()) { |
0 | 72 allow_inline = false; |
73 } | |
74 | |
75 // Note: When we get profiling during stage-1 compiles, we want to pull | |
76 // from more specific profile data which pertains to this inlining. | |
77 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
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78 ciCallProfile profile = caller->call_profile_at_bci(bci); |
0 | 79 |
80 // See how many times this site has been invoked. | |
81 int site_count = profile.count(); | |
82 int receiver_count = -1; | |
83 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) { | |
84 // Receivers in the profile structure are ordered by call counts | |
85 // so that the most called (major) receiver is profile.receiver(0). | |
86 receiver_count = profile.receiver_count(0); | |
87 } | |
88 | |
89 CompileLog* log = this->log(); | |
90 if (log != NULL) { | |
91 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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92 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
0 | 93 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
94 log->identify(call_method), site_count, prof_factor); | |
95 if (call_is_virtual) log->print(" virtual='1'"); | |
96 if (allow_inline) log->print(" inline='1'"); | |
97 if (receiver_count >= 0) { | |
98 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
99 if (profile.has_receiver(1)) { | |
100 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
101 } | |
102 } | |
103 log->end_elem(); | |
104 } | |
105 | |
106 // Special case the handling of certain common, profitable library | |
107 // methods. If these methods are replaced with specialized code, | |
108 // then we return it as the inlined version of the call. | |
109 // We do this before the strict f.p. check below because the | |
110 // intrinsics handle strict f.p. correctly. | |
111 if (allow_inline) { | |
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112 CallGenerator* cg = find_intrinsic(call_method, call_is_virtual); |
0 | 113 if (cg != NULL) return cg; |
114 } | |
115 | |
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116 // Do method handle calls. |
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117 // NOTE: This must happen before normal inlining logic below since |
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118 // MethodHandle.invoke* are native methods which obviously don't |
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119 // have bytecodes and so normal inlining fails. |
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120 if (call_method->is_method_handle_invoke()) { |
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121 if (bytecode != Bytecodes::_invokedynamic) { |
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122 GraphKit kit(jvms); |
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123 Node* method_handle = kit.argument(0); |
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124 return CallGenerator::for_method_handle_call(method_handle, jvms, caller, call_method, profile); |
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125 } |
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126 else { |
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127 return CallGenerator::for_invokedynamic_call(jvms, caller, call_method, profile); |
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128 } |
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129 } |
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130 |
0 | 131 // Do not inline strict fp into non-strict code, or the reverse |
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132 if (caller->is_strict() ^ call_method->is_strict()) { |
0 | 133 allow_inline = false; |
134 } | |
135 | |
136 // Attempt to inline... | |
137 if (allow_inline) { | |
138 // The profile data is only partly attributable to this caller, | |
139 // scale back the call site information. | |
140 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
141 // This is the number of times we expect the call code to be used. | |
142 float expected_uses = past_uses; | |
143 | |
144 // Try inlining a bytecoded method: | |
145 if (!call_is_virtual) { | |
146 InlineTree* ilt; | |
147 if (UseOldInlining) { | |
148 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
149 } else { | |
150 // Make a disembodied, stateless ILT. | |
151 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
152 float site_invoke_ratio = prof_factor; | |
153 // Note: ilt is for the root of this parse, not the present call site. | |
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154 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, MaxInlineLevel); |
0 | 155 } |
156 WarmCallInfo scratch_ci; | |
157 if (!UseOldInlining) | |
158 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
159 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
160 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
161 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
162 bool require_inline = (allow_inline && ci->is_hot()); | |
163 | |
164 if (allow_inline) { | |
165 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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166 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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167 // Delay the inlining of this method to give us the |
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168 // opportunity to perform some high level optimizations |
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169 // first. |
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170 return CallGenerator::for_late_inline(call_method, cg); |
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171 } |
0 | 172 if (cg == NULL) { |
173 // Fall through. | |
174 } else if (require_inline || !InlineWarmCalls) { | |
175 return cg; | |
176 } else { | |
177 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
178 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
179 } | |
180 } | |
181 } | |
182 | |
183 // Try using the type profile. | |
184 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
185 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
186 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
187 ciMethod* receiver_method = NULL; | |
188 if (have_major_receiver || profile.morphism() == 1 || | |
189 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
190 // receiver_method = profile.method(); | |
191 // Profiles do not suggest methods now. Look it up in the major receiver. | |
192 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
193 profile.receiver(0)); | |
194 } | |
195 if (receiver_method != NULL) { | |
196 // The single majority receiver sufficiently outweighs the minority. | |
197 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
198 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
199 if (hit_cg != NULL) { | |
200 // Look up second receiver. | |
201 CallGenerator* next_hit_cg = NULL; | |
202 ciMethod* next_receiver_method = NULL; | |
203 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
204 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
205 profile.receiver(1)); | |
206 if (next_receiver_method != NULL) { | |
207 next_hit_cg = this->call_generator(next_receiver_method, | |
208 vtable_index, !call_is_virtual, jvms, | |
209 allow_inline, prof_factor); | |
210 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
211 have_major_receiver && UseOnlyInlinedBimorphic) { | |
212 // Skip if we can't inline second receiver's method | |
213 next_hit_cg = NULL; | |
214 } | |
215 } | |
216 } | |
217 CallGenerator* miss_cg; | |
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218 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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219 Deoptimization::Reason_bimorphic : |
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220 Deoptimization::Reason_class_check; |
0 | 221 if (( profile.morphism() == 1 || |
222 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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223 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 224 ) { |
225 // Generate uncommon trap for class check failure path | |
226 // in case of monomorphic or bimorphic virtual call site. | |
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227 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
0 | 228 Deoptimization::Action_maybe_recompile); |
229 } else { | |
230 // Generate virtual call for class check failure path | |
231 // in case of polymorphic virtual call site. | |
232 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
233 } | |
234 if (miss_cg != NULL) { | |
235 if (next_hit_cg != NULL) { | |
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236 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1))); |
0 | 237 // We don't need to record dependency on a receiver here and below. |
238 // Whenever we inline, the dependency is added by Parse::Parse(). | |
239 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
240 } | |
241 if (miss_cg != NULL) { | |
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242 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
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243 CallGenerator* cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
0 | 244 if (cg != NULL) return cg; |
245 } | |
246 } | |
247 } | |
248 } | |
249 } | |
250 } | |
251 | |
252 // There was no special inlining tactic, or it bailed out. | |
253 // Use a more generic tactic, like a simple call. | |
254 if (call_is_virtual) { | |
255 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
256 } else { | |
257 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
258 // or it is a static or special call. | |
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259 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
0 | 260 } |
261 } | |
262 | |
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263 // Return true for methods that shouldn't be inlined early so that |
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264 // they are easier to analyze and optimize as intrinsics. |
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265 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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266 if (has_stringbuilder()) { |
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267 |
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268 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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269 call_method->holder() == C->env()->StringBuffer_klass()) && |
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270 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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271 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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272 // Delay SB calls only when called from non-SB code |
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273 return false; |
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274 } |
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275 |
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276 switch (call_method->intrinsic_id()) { |
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277 case vmIntrinsics::_StringBuilder_void: |
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278 case vmIntrinsics::_StringBuilder_int: |
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279 case vmIntrinsics::_StringBuilder_String: |
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280 case vmIntrinsics::_StringBuilder_append_char: |
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281 case vmIntrinsics::_StringBuilder_append_int: |
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282 case vmIntrinsics::_StringBuilder_append_String: |
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283 case vmIntrinsics::_StringBuilder_toString: |
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284 case vmIntrinsics::_StringBuffer_void: |
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285 case vmIntrinsics::_StringBuffer_int: |
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286 case vmIntrinsics::_StringBuffer_String: |
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287 case vmIntrinsics::_StringBuffer_append_char: |
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288 case vmIntrinsics::_StringBuffer_append_int: |
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289 case vmIntrinsics::_StringBuffer_append_String: |
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290 case vmIntrinsics::_StringBuffer_toString: |
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291 case vmIntrinsics::_Integer_toString: |
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292 return true; |
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293 |
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294 case vmIntrinsics::_String_String: |
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295 { |
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296 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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297 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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298 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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299 ciMethod* m = csj->method(); |
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300 if (m != NULL && |
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301 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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302 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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303 // Delay String.<init>(new SB()) |
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304 return true; |
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305 } |
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306 return false; |
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307 } |
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308 |
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309 default: |
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310 return false; |
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311 } |
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312 } |
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313 return false; |
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314 } |
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315 |
0 | 316 |
317 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
318 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
319 // Additional inputs to consider... | |
320 // bc = bc() | |
321 // caller = method() | |
322 // iter().get_method_holder_index() | |
323 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
324 // Interface classes can be loaded & linked and never get around to | |
325 // being initialized. Uncommon-trap for not-initialized static or | |
326 // v-calls. Let interface calls happen. | |
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327 ciInstanceKlass* holder_klass = dest_method->holder(); |
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328 if (!holder_klass->is_being_initialized() && |
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329 !holder_klass->is_initialized() && |
0 | 330 !holder_klass->is_interface()) { |
331 uncommon_trap(Deoptimization::Reason_uninitialized, | |
332 Deoptimization::Action_reinterpret, | |
333 holder_klass); | |
334 return true; | |
335 } | |
336 | |
337 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
338 return false; | |
339 } | |
340 | |
341 | |
342 //------------------------------do_call---------------------------------------- | |
343 // Handle your basic call. Inline if we can & want to, else just setup call. | |
344 void Parse::do_call() { | |
345 // It's likely we are going to add debug info soon. | |
346 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
347 // our contribution to it is cleaned up right here. | |
348 kill_dead_locals(); | |
349 | |
350 // Set frequently used booleans | |
351 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
352 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
353 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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354 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
0 | 355 |
356 // Find target being called | |
357 bool will_link; | |
358 ciMethod* dest_method = iter().get_method(will_link); | |
359 ciInstanceKlass* holder_klass = dest_method->holder(); | |
360 ciKlass* holder = iter().get_declared_method_holder(); | |
361 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
362 | |
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363 int nargs = dest_method->arg_size(); |
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364 if (is_invokedynamic) nargs -= 1; |
0 | 365 |
366 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
367 // bailout when too many arguments for register representation | |
368 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
369 #ifndef PRODUCT | |
370 if (PrintOpto && (Verbose || WizardMode)) { | |
371 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
372 dest_method->print_name(); tty->cr(); | |
373 } | |
374 #endif | |
375 return; | |
376 } | |
377 assert(holder_klass->is_loaded(), ""); | |
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378 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
0 | 379 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
380 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
381 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
382 // Note: In the absence of miranda methods, an abstract class K can perform | |
383 // an invokevirtual directly on an interface method I.m if K implements I. | |
384 | |
385 // --------------------- | |
386 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
387 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
388 // Does the call-site type profile reveal only one receiver? | |
389 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
390 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
391 | |
392 // Choose call strategy. | |
393 bool call_is_virtual = is_virtual_or_interface; | |
394 int vtable_index = methodOopDesc::invalid_vtable_index; | |
395 ciMethod* call_method = dest_method; | |
396 | |
397 // Try to get the most accurate receiver type | |
398 if (is_virtual_or_interface) { | |
399 Node* receiver_node = stack(sp() - nargs); | |
400 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
401 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
402 | |
403 // Have the call been sufficiently improved such that it is no longer a virtual? | |
404 if (optimized_virtual_method != NULL) { | |
405 call_method = optimized_virtual_method; | |
406 call_is_virtual = false; | |
407 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
408 // We can make a vtable call at this site | |
409 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
410 } | |
411 } | |
412 | |
413 // Note: It's OK to try to inline a virtual call. | |
414 // The call generator will not attempt to inline a polymorphic call | |
415 // unless it knows how to optimize the receiver dispatch. | |
416 bool try_inline = (C->do_inlining() || InlineAccessors); | |
417 | |
418 // --------------------- | |
419 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
420 JVMState* jvms = sync_jvms(); | |
421 | |
422 // --------------------- | |
423 // Decide call tactic. | |
424 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
425 // It decides whether inlining is desirable or not. | |
426 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
427 | |
428 // --------------------- | |
429 // Round double arguments before call | |
430 round_double_arguments(dest_method); | |
431 | |
432 #ifndef PRODUCT | |
433 // bump global counters for calls | |
434 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
435 | |
436 // Record first part of parsing work for this call | |
437 parse_histogram()->record_change(); | |
438 #endif // not PRODUCT | |
439 | |
440 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
441 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
442 | |
443 // save across call, for a subsequent cast_not_null. | |
444 Node* receiver = has_receiver ? argument(0) : NULL; | |
445 | |
446 // Bump method data counters (We profile *before* the call is made | |
447 // because exceptions don't return to the call site.) | |
448 profile_call(receiver); | |
449 | |
450 JVMState* new_jvms; | |
451 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
452 // When inlining attempt fails (e.g., too many arguments), | |
453 // it may contaminate the current compile state, making it | |
454 // impossible to pull back and try again. Once we call | |
455 // cg->generate(), we are committed. If it fails, the whole | |
456 // compilation task is compromised. | |
457 if (failing()) return; | |
458 #ifndef PRODUCT | |
459 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
460 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
461 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
462 tty->print("Bailed out of intrinsic, will not inline: "); | |
463 call_method->print_name(); tty->cr(); | |
464 } | |
465 } | |
466 #endif | |
467 // This can happen if a library intrinsic is available, but refuses | |
468 // the call site, perhaps because it did not match a pattern the | |
469 // intrinsic was expecting to optimize. The fallback position is | |
470 // to call out-of-line. | |
471 try_inline = false; // Inline tactic bailed out. | |
472 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
473 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
474 guarantee(failing(), "call failed to generate: calls should work"); | |
475 return; | |
476 } | |
477 } | |
478 | |
479 if (cg->is_inline()) { | |
67 | 480 // Accumulate has_loops estimate |
481 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
0 | 482 C->env()->notice_inlined_method(call_method); |
483 } | |
484 | |
485 // Reset parser state from [new_]jvms, which now carries results of the call. | |
486 // Return value (if any) is already pushed on the stack by the cg. | |
487 add_exception_states_from(new_jvms); | |
488 if (new_jvms->map()->control() == top()) { | |
489 stop_and_kill_map(); | |
490 } else { | |
491 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
492 set_jvms(new_jvms); | |
493 } | |
494 | |
495 if (!stopped()) { | |
496 // This was some sort of virtual call, which did a null check for us. | |
497 // Now we can assert receiver-not-null, on the normal return path. | |
498 if (receiver != NULL && cg->is_virtual()) { | |
499 Node* cast = cast_not_null(receiver); | |
500 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
501 } | |
502 | |
503 // Round double result after a call from strict to non-strict code | |
504 round_double_result(dest_method); | |
505 | |
506 // If the return type of the method is not loaded, assert that the | |
507 // value we got is a null. Otherwise, we need to recompile. | |
508 if (!dest_method->return_type()->is_loaded()) { | |
509 #ifndef PRODUCT | |
510 if (PrintOpto && (Verbose || WizardMode)) { | |
511 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
512 dest_method->print_name(); tty->cr(); | |
513 } | |
514 #endif | |
515 if (C->log() != NULL) { | |
516 C->log()->elem("assert_null reason='return' klass='%d'", | |
517 C->log()->identify(dest_method->return_type())); | |
518 } | |
519 // If there is going to be a trap, put it at the next bytecode: | |
520 set_bci(iter().next_bci()); | |
521 do_null_assert(peek(), T_OBJECT); | |
522 set_bci(iter().cur_bci()); // put it back | |
523 } | |
524 } | |
525 | |
526 // Restart record of parsing work after possible inlining of call | |
527 #ifndef PRODUCT | |
528 parse_histogram()->set_initial_state(bc()); | |
529 #endif | |
530 } | |
531 | |
532 //---------------------------catch_call_exceptions----------------------------- | |
533 // Put a Catch and CatchProj nodes behind a just-created call. | |
534 // Send their caught exceptions to the proper handler. | |
535 // This may be used after a call to the rethrow VM stub, | |
536 // when it is needed to process unloaded exception classes. | |
537 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
538 // Exceptions are delivered through this channel: | |
539 Node* i_o = this->i_o(); | |
540 | |
541 // Add a CatchNode. | |
542 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
543 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
544 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
545 | |
546 for (; !handlers.is_done(); handlers.next()) { | |
547 ciExceptionHandler* h = handlers.handler(); | |
548 int h_bci = h->handler_bci(); | |
549 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
550 // Do not introduce unloaded exception types into the graph: | |
551 if (!h_klass->is_loaded()) { | |
552 if (saw_unloaded->contains(h_bci)) { | |
553 /* We've already seen an unloaded exception with h_bci, | |
554 so don't duplicate. Duplication will cause the CatchNode to be | |
555 unnecessarily large. See 4713716. */ | |
556 continue; | |
557 } else { | |
558 saw_unloaded->append(h_bci); | |
559 } | |
560 } | |
561 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
562 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
563 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
564 assert(!h_extype->empty(), "sanity"); | |
565 // Note: It's OK if the BCIs repeat themselves. | |
566 bcis->append(h_bci); | |
567 extypes->append(h_extype); | |
568 } | |
569 | |
570 int len = bcis->length(); | |
571 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
572 Node *catch_ = _gvn.transform(cn); | |
573 | |
574 // now branch with the exception state to each of the (potential) | |
575 // handlers | |
576 for(int i=0; i < len; i++) { | |
577 // Setup JVM state to enter the handler. | |
578 PreserveJVMState pjvms(this); | |
579 // Locals are just copied from before the call. | |
580 // Get control from the CatchNode. | |
581 int handler_bci = bcis->at(i); | |
582 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
583 // This handler cannot happen? | |
584 if (ctrl == top()) continue; | |
585 set_control(ctrl); | |
586 | |
587 // Create exception oop | |
588 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
589 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
590 | |
591 // Handle unloaded exception classes. | |
592 if (saw_unloaded->contains(handler_bci)) { | |
593 // An unloaded exception type is coming here. Do an uncommon trap. | |
594 #ifndef PRODUCT | |
595 // We do not expect the same handler bci to take both cold unloaded | |
596 // and hot loaded exceptions. But, watch for it. | |
597 if (extype->is_loaded()) { | |
598 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
599 method()->print_name(); tty->cr(); | |
600 } else if (PrintOpto && (Verbose || WizardMode)) { | |
601 tty->print("Bailing out on unloaded exception type "); | |
602 extype->klass()->print_name(); | |
603 tty->print(" at bci:%d in ", bci()); | |
604 method()->print_name(); tty->cr(); | |
605 } | |
606 #endif | |
607 // Emit an uncommon trap instead of processing the block. | |
608 set_bci(handler_bci); | |
609 push_ex_oop(ex_oop); | |
610 uncommon_trap(Deoptimization::Reason_unloaded, | |
611 Deoptimization::Action_reinterpret, | |
612 extype->klass(), "!loaded exception"); | |
613 set_bci(iter().cur_bci()); // put it back | |
614 continue; | |
615 } | |
616 | |
617 // go to the exception handler | |
618 if (handler_bci < 0) { // merge with corresponding rethrow node | |
619 throw_to_exit(make_exception_state(ex_oop)); | |
620 } else { // Else jump to corresponding handle | |
621 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
622 merge_exception(handler_bci); | |
623 } | |
624 } | |
625 | |
626 // The first CatchProj is for the normal return. | |
627 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
628 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
629 } | |
630 | |
631 | |
632 //----------------------------catch_inline_exceptions-------------------------- | |
633 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
634 // Common case 1: we have no handler, so all exceptions merge right into | |
635 // the rethrow case. | |
636 // Case 2: we have some handlers, with loaded exception klasses that have | |
637 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
638 // exception oop and branch to the handler directly. | |
639 // Case 3: We have some handlers with subklasses or are not loaded at | |
640 // compile-time. We have to call the runtime to resolve the exception. | |
641 // So we insert a RethrowCall and all the logic that goes with it. | |
642 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
643 // Caller is responsible for saving away the map for normal control flow! | |
644 assert(stopped(), "call set_map(NULL) first"); | |
645 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
646 | |
647 Node* ex_node = saved_ex_oop(ex_map); | |
648 if (ex_node == top()) { | |
649 // No action needed. | |
650 return; | |
651 } | |
652 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
653 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
654 if (ex_type == NULL) | |
655 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
656 | |
657 // determine potential exception handlers | |
658 ciExceptionHandlerStream handlers(method(), bci(), | |
659 ex_type->klass()->as_instance_klass(), | |
660 ex_type->klass_is_exact()); | |
661 | |
662 // Start executing from the given throw state. (Keep its stack, for now.) | |
663 // Get the exception oop as known at compile time. | |
664 ex_node = use_exception_state(ex_map); | |
665 | |
666 // Get the exception oop klass from its header | |
667 Node* ex_klass_node = NULL; | |
668 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
669 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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670 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 671 |
672 // Compute the exception klass a little more cleverly. | |
673 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
674 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
675 // each arm of the Phi. If I know something clever about the exceptions | |
676 // I'm loading the class from, I can replace the LoadKlass with the | |
677 // klass constant for the exception oop. | |
678 if( ex_node->is_Phi() ) { | |
679 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
680 for( uint i = 1; i < ex_node->req(); i++ ) { | |
681 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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682 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 683 ex_klass_node->init_req( i, k ); |
684 } | |
685 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
686 | |
687 } | |
688 } | |
689 | |
690 // Scan the exception table for applicable handlers. | |
691 // If none, we can call rethrow() and be done! | |
692 // If precise (loaded with no subklasses), insert a D.S. style | |
693 // pointer compare to the correct handler and loop back. | |
694 // If imprecise, switch to the Rethrow VM-call style handling. | |
695 | |
696 int remaining = handlers.count_remaining(); | |
697 | |
698 // iterate through all entries sequentially | |
699 for (;!handlers.is_done(); handlers.next()) { | |
700 ciExceptionHandler* handler = handlers.handler(); | |
701 | |
702 if (handler->is_rethrow()) { | |
703 // If we fell off the end of the table without finding an imprecise | |
704 // exception klass (and without finding a generic handler) then we | |
705 // know this exception is not handled in this method. We just rethrow | |
706 // the exception into the caller. | |
707 throw_to_exit(make_exception_state(ex_node)); | |
708 return; | |
709 } | |
710 | |
711 // exception handler bci range covers throw_bci => investigate further | |
712 int handler_bci = handler->handler_bci(); | |
713 | |
714 if (remaining == 1) { | |
715 push_ex_oop(ex_node); // Push exception oop for handler | |
716 #ifndef PRODUCT | |
717 if (PrintOpto && WizardMode) { | |
718 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
719 } | |
720 #endif | |
721 merge_exception(handler_bci); // jump to handler | |
722 return; // No more handling to be done here! | |
723 } | |
724 | |
1344 | 725 // Get the handler's klass |
0 | 726 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 727 |
728 if (!klass->is_loaded()) { // klass is not loaded? | |
729 // fall through into catch_call_exceptions which will emit a | |
730 // handler with an uncommon trap. | |
731 break; | |
0 | 732 } |
733 | |
734 if (klass->is_interface()) // should not happen, but... | |
735 break; // bail out | |
736 | |
1344 | 737 // Check the type of the exception against the catch type |
0 | 738 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
739 Node* con = _gvn.makecon(tk); | |
1344 | 740 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
741 if (!stopped()) { | |
742 PreserveJVMState pjvms(this); | |
743 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
744 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
0 | 745 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
746 push_ex_oop(ex_oop); // Push exception oop for handler | |
747 #ifndef PRODUCT | |
748 if (PrintOpto && WizardMode) { | |
749 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
750 klass->print_name(); | |
751 tty->cr(); | |
752 } | |
753 #endif | |
754 merge_exception(handler_bci); | |
755 } | |
1344 | 756 set_control(not_subtype_ctrl); |
0 | 757 |
758 // Come here if exception does not match handler. | |
759 // Carry on with more handler checks. | |
760 --remaining; | |
761 } | |
762 | |
763 assert(!stopped(), "you should return if you finish the chain"); | |
764 | |
765 // Oops, need to call into the VM to resolve the klasses at runtime. | |
766 // Note: This call must not deoptimize, since it is not a real at this bci! | |
767 kill_dead_locals(); | |
768 | |
769 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
770 OptoRuntime::rethrow_Type(), | |
771 OptoRuntime::rethrow_stub(), | |
772 NULL, NULL, | |
773 ex_node); | |
774 | |
775 // Rethrow is a pure call, no side effects, only a result. | |
776 // The result cannot be allocated, so we use I_O | |
777 | |
778 // Catch exceptions from the rethrow | |
779 catch_call_exceptions(handlers); | |
780 } | |
781 | |
782 | |
783 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
784 | |
785 | |
786 #ifndef PRODUCT | |
787 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
788 if( CountCompiledCalls ) { | |
789 if( at_method_entry ) { | |
790 // bump invocation counter if top method (for statistics) | |
791 if (CountCompiledCalls && depth() == 1) { | |
792 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
793 Node* adr1 = makecon(addr_type); | |
794 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
795 increment_counter(adr2); | |
796 } | |
797 } else if (is_inline) { | |
798 switch (bc()) { | |
799 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
800 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
801 case Bytecodes::_invokestatic: | |
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802 case Bytecodes::_invokedynamic: |
0 | 803 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
804 default: fatal("unexpected call bytecode"); | |
805 } | |
806 } else { | |
807 switch (bc()) { | |
808 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
809 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
810 case Bytecodes::_invokestatic: | |
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811 case Bytecodes::_invokedynamic: |
0 | 812 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
813 default: fatal("unexpected call bytecode"); | |
814 } | |
815 } | |
816 } | |
817 } | |
818 #endif //PRODUCT | |
819 | |
820 | |
821 // Identify possible target method and inlining style | |
822 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
823 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
824 // only use for virtual or interface calls | |
825 | |
826 // If it is obviously final, do not bother to call find_monomorphic_target, | |
827 // because the class hierarchy checks are not needed, and may fail due to | |
828 // incompletely loaded classes. Since we do our own class loading checks | |
829 // in this module, we may confidently bind to any method. | |
830 if (dest_method->can_be_statically_bound()) { | |
831 return dest_method; | |
832 } | |
833 | |
834 // Attempt to improve the receiver | |
835 bool actual_receiver_is_exact = false; | |
836 ciInstanceKlass* actual_receiver = klass; | |
837 if (receiver_type != NULL) { | |
838 // Array methods are all inherited from Object, and are monomorphic. | |
839 if (receiver_type->isa_aryptr() && | |
840 dest_method->holder() == env()->Object_klass()) { | |
841 return dest_method; | |
842 } | |
843 | |
844 // All other interesting cases are instance klasses. | |
845 if (!receiver_type->isa_instptr()) { | |
846 return NULL; | |
847 } | |
848 | |
849 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
850 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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851 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 852 // ikl is a same or better type than the original actual_receiver, |
853 // e.g. static receiver from bytecodes. | |
854 actual_receiver = ikl; | |
855 // Is the actual_receiver exact? | |
856 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
857 } | |
858 } | |
859 | |
860 ciInstanceKlass* calling_klass = caller->holder(); | |
861 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
862 if (cha_monomorphic_target != NULL) { | |
863 assert(!cha_monomorphic_target->is_abstract(), ""); | |
864 // Look at the method-receiver type. Does it add "too much information"? | |
865 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
866 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
867 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
868 // Calling this method would include an implicit cast to its holder. | |
869 // %%% Not yet implemented. Would throw minor asserts at present. | |
870 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
871 // To fix, put the higher_equal check at the call of this routine, | |
872 // and add a CheckCastPP to the receiver. | |
873 if (TraceDependencies) { | |
874 tty->print_cr("found unique CHA method, but could not cast up"); | |
875 tty->print(" method = "); | |
876 cha_monomorphic_target->print(); | |
877 tty->cr(); | |
878 } | |
879 if (C->log() != NULL) { | |
880 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
881 C->log()->identify(klass), | |
882 C->log()->identify(cha_monomorphic_target)); | |
883 } | |
884 cha_monomorphic_target = NULL; | |
885 } | |
886 } | |
887 if (cha_monomorphic_target != NULL) { | |
888 // Hardwiring a virtual. | |
889 // If we inlined because CHA revealed only a single target method, | |
890 // then we are dependent on that target method not getting overridden | |
891 // by dynamic class loading. Be sure to test the "static" receiver | |
892 // dest_method here, as opposed to the actual receiver, which may | |
893 // falsely lead us to believe that the receiver is final or private. | |
894 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
895 return cha_monomorphic_target; | |
896 } | |
897 | |
898 // If the type is exact, we can still bind the method w/o a vcall. | |
899 // (This case comes after CHA so we can see how much extra work it does.) | |
900 if (actual_receiver_is_exact) { | |
901 // In case of evolution, there is a dependence on every inlined method, since each | |
902 // such method can be changed when its class is redefined. | |
903 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
904 if (exact_method != NULL) { | |
905 #ifndef PRODUCT | |
906 if (PrintOpto) { | |
907 tty->print(" Calling method via exact type @%d --- ", bci); | |
908 exact_method->print_name(); | |
909 tty->cr(); | |
910 } | |
911 #endif | |
912 return exact_method; | |
913 } | |
914 } | |
915 | |
916 return NULL; | |
917 } |