Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 2831:f072013daba9
Added lookup method.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Tue, 31 May 2011 11:32:48 +0200 |
parents | 4124a5a27707 |
children | e2a92dd0d3d2 |
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) { |
0 | 65 CallGenerator* cg; |
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66 guarantee(call_method != NULL, "failed method resolution"); |
0 | 67 |
68 // Dtrace currently doesn't work unless all calls are vanilla | |
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69 if (env()->dtrace_method_probes()) { |
0 | 70 allow_inline = false; |
71 } | |
72 | |
73 // Note: When we get profiling during stage-1 compiles, we want to pull | |
74 // from more specific profile data which pertains to this inlining. | |
75 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
76 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci()); | |
77 | |
78 // See how many times this site has been invoked. | |
79 int site_count = profile.count(); | |
80 int receiver_count = -1; | |
81 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) { | |
82 // Receivers in the profile structure are ordered by call counts | |
83 // so that the most called (major) receiver is profile.receiver(0). | |
84 receiver_count = profile.receiver_count(0); | |
85 } | |
86 | |
87 CompileLog* log = this->log(); | |
88 if (log != NULL) { | |
89 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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90 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
0 | 91 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
92 log->identify(call_method), site_count, prof_factor); | |
93 if (call_is_virtual) log->print(" virtual='1'"); | |
94 if (allow_inline) log->print(" inline='1'"); | |
95 if (receiver_count >= 0) { | |
96 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
97 if (profile.has_receiver(1)) { | |
98 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
99 } | |
100 } | |
101 log->end_elem(); | |
102 } | |
103 | |
104 // Special case the handling of certain common, profitable library | |
105 // methods. If these methods are replaced with specialized code, | |
106 // then we return it as the inlined version of the call. | |
107 // We do this before the strict f.p. check below because the | |
108 // intrinsics handle strict f.p. correctly. | |
109 if (allow_inline) { | |
110 cg = find_intrinsic(call_method, call_is_virtual); | |
111 if (cg != NULL) return cg; | |
112 } | |
113 | |
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114 // Do MethodHandle calls. |
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115 // NOTE: This must happen before normal inlining logic below since |
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116 // MethodHandle.invoke* are native methods which obviously don't |
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117 // have bytecodes and so normal inlining fails. |
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118 if (call_method->is_method_handle_invoke()) { |
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119 if (jvms->method()->java_code_at_bci(jvms->bci()) != Bytecodes::_invokedynamic) { |
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120 GraphKit kit(jvms); |
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121 Node* n = kit.argument(0); |
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122 |
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123 if (n->Opcode() == Op_ConP) { |
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124 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr(); |
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125 ciObject* const_oop = oop_ptr->const_oop(); |
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126 ciMethodHandle* method_handle = const_oop->as_method_handle(); |
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127 |
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128 // Set the actually called method to have access to the class |
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129 // and signature in the MethodHandleCompiler. |
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130 method_handle->set_callee(call_method); |
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131 |
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132 // Get an adapter for the MethodHandle. |
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133 ciMethod* target_method = method_handle->get_method_handle_adapter(); |
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134 CallGenerator* hit_cg = NULL; |
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135 if (target_method != NULL) |
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136 hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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137 if (hit_cg != NULL && hit_cg->is_inline()) |
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138 return hit_cg; |
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139 } |
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140 |
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141 return CallGenerator::for_direct_call(call_method); |
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142 } |
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143 else { |
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144 // Get the MethodHandle from the CallSite. |
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145 ciMethod* caller_method = jvms->method(); |
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146 ciBytecodeStream str(caller_method); |
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147 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci. |
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148 ciCallSite* call_site = str.get_call_site(); |
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149 ciMethodHandle* method_handle = call_site->get_target(); |
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150 |
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151 // Set the actually called method to have access to the class |
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152 // and signature in the MethodHandleCompiler. |
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153 method_handle->set_callee(call_method); |
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154 |
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155 // Get an adapter for the MethodHandle. |
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156 ciMethod* target_method = method_handle->get_invokedynamic_adapter(); |
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157 CallGenerator* hit_cg = NULL; |
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158 if (target_method != NULL) |
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159 hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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160 if (hit_cg != NULL && hit_cg->is_inline()) { |
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161 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method); |
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162 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor); |
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163 } |
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164 |
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165 // If something failed, generate a normal dynamic call. |
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166 return CallGenerator::for_dynamic_call(call_method); |
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167 } |
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168 } |
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169 |
0 | 170 // Do not inline strict fp into non-strict code, or the reverse |
171 bool caller_method_is_strict = jvms->method()->is_strict(); | |
172 if( caller_method_is_strict ^ call_method->is_strict() ) { | |
173 allow_inline = false; | |
174 } | |
175 | |
176 // Attempt to inline... | |
177 if (allow_inline) { | |
178 // The profile data is only partly attributable to this caller, | |
179 // scale back the call site information. | |
180 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
181 // This is the number of times we expect the call code to be used. | |
182 float expected_uses = past_uses; | |
183 | |
184 // Try inlining a bytecoded method: | |
185 if (!call_is_virtual) { | |
186 InlineTree* ilt; | |
187 if (UseOldInlining) { | |
188 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
189 } else { | |
190 // Make a disembodied, stateless ILT. | |
191 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
192 float site_invoke_ratio = prof_factor; | |
193 // Note: ilt is for the root of this parse, not the present call site. | |
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194 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0); |
0 | 195 } |
196 WarmCallInfo scratch_ci; | |
197 if (!UseOldInlining) | |
198 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
199 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
200 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
201 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
202 bool require_inline = (allow_inline && ci->is_hot()); | |
203 | |
204 if (allow_inline) { | |
205 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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206 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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207 // Delay the inlining of this method to give us the |
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208 // opportunity to perform some high level optimizations |
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209 // first. |
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210 return CallGenerator::for_late_inline(call_method, cg); |
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211 } |
0 | 212 if (cg == NULL) { |
213 // Fall through. | |
214 } else if (require_inline || !InlineWarmCalls) { | |
215 return cg; | |
216 } else { | |
217 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
218 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
219 } | |
220 } | |
221 } | |
222 | |
223 // Try using the type profile. | |
224 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
225 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
226 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
227 ciMethod* receiver_method = NULL; | |
228 if (have_major_receiver || profile.morphism() == 1 || | |
229 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
230 // receiver_method = profile.method(); | |
231 // Profiles do not suggest methods now. Look it up in the major receiver. | |
232 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
233 profile.receiver(0)); | |
234 } | |
235 if (receiver_method != NULL) { | |
236 // The single majority receiver sufficiently outweighs the minority. | |
237 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
238 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
239 if (hit_cg != NULL) { | |
240 // Look up second receiver. | |
241 CallGenerator* next_hit_cg = NULL; | |
242 ciMethod* next_receiver_method = NULL; | |
243 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
244 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
245 profile.receiver(1)); | |
246 if (next_receiver_method != NULL) { | |
247 next_hit_cg = this->call_generator(next_receiver_method, | |
248 vtable_index, !call_is_virtual, jvms, | |
249 allow_inline, prof_factor); | |
250 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
251 have_major_receiver && UseOnlyInlinedBimorphic) { | |
252 // Skip if we can't inline second receiver's method | |
253 next_hit_cg = NULL; | |
254 } | |
255 } | |
256 } | |
257 CallGenerator* miss_cg; | |
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258 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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259 Deoptimization::Reason_bimorphic : |
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260 Deoptimization::Reason_class_check; |
0 | 261 if (( profile.morphism() == 1 || |
262 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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263 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 264 ) { |
265 // Generate uncommon trap for class check failure path | |
266 // in case of monomorphic or bimorphic virtual call site. | |
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267 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
0 | 268 Deoptimization::Action_maybe_recompile); |
269 } else { | |
270 // Generate virtual call for class check failure path | |
271 // in case of polymorphic virtual call site. | |
272 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
273 } | |
274 if (miss_cg != NULL) { | |
275 if (next_hit_cg != NULL) { | |
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276 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1))); |
0 | 277 // We don't need to record dependency on a receiver here and below. |
278 // Whenever we inline, the dependency is added by Parse::Parse(). | |
279 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
280 } | |
281 if (miss_cg != NULL) { | |
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282 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
0 | 283 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
284 if (cg != NULL) return cg; | |
285 } | |
286 } | |
287 } | |
288 } | |
289 } | |
290 } | |
291 | |
292 // There was no special inlining tactic, or it bailed out. | |
293 // Use a more generic tactic, like a simple call. | |
294 if (call_is_virtual) { | |
295 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
296 } else { | |
297 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
298 // or it is a static or special call. | |
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299 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
0 | 300 } |
301 } | |
302 | |
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303 // Return true for methods that shouldn't be inlined early so that |
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304 // they are easier to analyze and optimize as intrinsics. |
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305 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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306 if (has_stringbuilder()) { |
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307 |
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308 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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309 call_method->holder() == C->env()->StringBuffer_klass()) && |
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310 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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311 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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312 // Delay SB calls only when called from non-SB code |
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313 return false; |
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314 } |
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315 |
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316 switch (call_method->intrinsic_id()) { |
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317 case vmIntrinsics::_StringBuilder_void: |
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318 case vmIntrinsics::_StringBuilder_int: |
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319 case vmIntrinsics::_StringBuilder_String: |
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320 case vmIntrinsics::_StringBuilder_append_char: |
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321 case vmIntrinsics::_StringBuilder_append_int: |
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322 case vmIntrinsics::_StringBuilder_append_String: |
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323 case vmIntrinsics::_StringBuilder_toString: |
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324 case vmIntrinsics::_StringBuffer_void: |
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325 case vmIntrinsics::_StringBuffer_int: |
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326 case vmIntrinsics::_StringBuffer_String: |
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327 case vmIntrinsics::_StringBuffer_append_char: |
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328 case vmIntrinsics::_StringBuffer_append_int: |
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329 case vmIntrinsics::_StringBuffer_append_String: |
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330 case vmIntrinsics::_StringBuffer_toString: |
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331 case vmIntrinsics::_Integer_toString: |
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332 return true; |
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333 |
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334 case vmIntrinsics::_String_String: |
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335 { |
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336 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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337 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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338 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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339 ciMethod* m = csj->method(); |
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340 if (m != NULL && |
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341 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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342 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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343 // Delay String.<init>(new SB()) |
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344 return true; |
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345 } |
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346 return false; |
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347 } |
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348 |
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349 default: |
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350 return false; |
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351 } |
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352 } |
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353 return false; |
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354 } |
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355 |
0 | 356 |
357 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
358 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
359 // Additional inputs to consider... | |
360 // bc = bc() | |
361 // caller = method() | |
362 // iter().get_method_holder_index() | |
363 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
364 // Interface classes can be loaded & linked and never get around to | |
365 // being initialized. Uncommon-trap for not-initialized static or | |
366 // v-calls. Let interface calls happen. | |
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367 ciInstanceKlass* holder_klass = dest_method->holder(); |
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368 if (!holder_klass->is_being_initialized() && |
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369 !holder_klass->is_initialized() && |
0 | 370 !holder_klass->is_interface()) { |
371 uncommon_trap(Deoptimization::Reason_uninitialized, | |
372 Deoptimization::Action_reinterpret, | |
373 holder_klass); | |
374 return true; | |
375 } | |
376 | |
377 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
378 return false; | |
379 } | |
380 | |
381 | |
382 //------------------------------do_call---------------------------------------- | |
383 // Handle your basic call. Inline if we can & want to, else just setup call. | |
384 void Parse::do_call() { | |
385 // It's likely we are going to add debug info soon. | |
386 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
387 // our contribution to it is cleaned up right here. | |
388 kill_dead_locals(); | |
389 | |
390 // Set frequently used booleans | |
391 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
392 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
393 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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394 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
0 | 395 |
396 // Find target being called | |
397 bool will_link; | |
398 ciMethod* dest_method = iter().get_method(will_link); | |
399 ciInstanceKlass* holder_klass = dest_method->holder(); | |
400 ciKlass* holder = iter().get_declared_method_holder(); | |
401 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
402 | |
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403 int nargs = dest_method->arg_size(); |
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404 if (is_invokedynamic) nargs -= 1; |
0 | 405 |
406 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
407 // bailout when too many arguments for register representation | |
408 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
409 #ifndef PRODUCT | |
410 if (PrintOpto && (Verbose || WizardMode)) { | |
411 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
412 dest_method->print_name(); tty->cr(); | |
413 } | |
414 #endif | |
415 return; | |
416 } | |
417 assert(holder_klass->is_loaded(), ""); | |
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418 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
0 | 419 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
420 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
421 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
422 // Note: In the absence of miranda methods, an abstract class K can perform | |
423 // an invokevirtual directly on an interface method I.m if K implements I. | |
424 | |
425 // --------------------- | |
426 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
427 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
428 // Does the call-site type profile reveal only one receiver? | |
429 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
430 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
431 | |
432 // Choose call strategy. | |
433 bool call_is_virtual = is_virtual_or_interface; | |
434 int vtable_index = methodOopDesc::invalid_vtable_index; | |
435 ciMethod* call_method = dest_method; | |
436 | |
437 // Try to get the most accurate receiver type | |
438 if (is_virtual_or_interface) { | |
439 Node* receiver_node = stack(sp() - nargs); | |
440 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
441 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
442 | |
443 // Have the call been sufficiently improved such that it is no longer a virtual? | |
444 if (optimized_virtual_method != NULL) { | |
445 call_method = optimized_virtual_method; | |
446 call_is_virtual = false; | |
447 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
448 // We can make a vtable call at this site | |
449 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
450 } | |
451 } | |
452 | |
453 // Note: It's OK to try to inline a virtual call. | |
454 // The call generator will not attempt to inline a polymorphic call | |
455 // unless it knows how to optimize the receiver dispatch. | |
456 bool try_inline = (C->do_inlining() || InlineAccessors); | |
457 | |
458 // --------------------- | |
459 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
460 JVMState* jvms = sync_jvms(); | |
461 | |
462 // --------------------- | |
463 // Decide call tactic. | |
464 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
465 // It decides whether inlining is desirable or not. | |
466 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
467 | |
468 // --------------------- | |
469 // Round double arguments before call | |
470 round_double_arguments(dest_method); | |
471 | |
472 #ifndef PRODUCT | |
473 // bump global counters for calls | |
474 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
475 | |
476 // Record first part of parsing work for this call | |
477 parse_histogram()->record_change(); | |
478 #endif // not PRODUCT | |
479 | |
480 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
481 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
482 | |
483 // save across call, for a subsequent cast_not_null. | |
484 Node* receiver = has_receiver ? argument(0) : NULL; | |
485 | |
486 // Bump method data counters (We profile *before* the call is made | |
487 // because exceptions don't return to the call site.) | |
488 profile_call(receiver); | |
489 | |
490 JVMState* new_jvms; | |
491 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
492 // When inlining attempt fails (e.g., too many arguments), | |
493 // it may contaminate the current compile state, making it | |
494 // impossible to pull back and try again. Once we call | |
495 // cg->generate(), we are committed. If it fails, the whole | |
496 // compilation task is compromised. | |
497 if (failing()) return; | |
498 #ifndef PRODUCT | |
499 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
500 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
501 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
502 tty->print("Bailed out of intrinsic, will not inline: "); | |
503 call_method->print_name(); tty->cr(); | |
504 } | |
505 } | |
506 #endif | |
507 // This can happen if a library intrinsic is available, but refuses | |
508 // the call site, perhaps because it did not match a pattern the | |
509 // intrinsic was expecting to optimize. The fallback position is | |
510 // to call out-of-line. | |
511 try_inline = false; // Inline tactic bailed out. | |
512 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
513 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
514 guarantee(failing(), "call failed to generate: calls should work"); | |
515 return; | |
516 } | |
517 } | |
518 | |
519 if (cg->is_inline()) { | |
67 | 520 // Accumulate has_loops estimate |
521 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
0 | 522 C->env()->notice_inlined_method(call_method); |
523 } | |
524 | |
525 // Reset parser state from [new_]jvms, which now carries results of the call. | |
526 // Return value (if any) is already pushed on the stack by the cg. | |
527 add_exception_states_from(new_jvms); | |
528 if (new_jvms->map()->control() == top()) { | |
529 stop_and_kill_map(); | |
530 } else { | |
531 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
532 set_jvms(new_jvms); | |
533 } | |
534 | |
535 if (!stopped()) { | |
536 // This was some sort of virtual call, which did a null check for us. | |
537 // Now we can assert receiver-not-null, on the normal return path. | |
538 if (receiver != NULL && cg->is_virtual()) { | |
539 Node* cast = cast_not_null(receiver); | |
540 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
541 } | |
542 | |
543 // Round double result after a call from strict to non-strict code | |
544 round_double_result(dest_method); | |
545 | |
546 // If the return type of the method is not loaded, assert that the | |
547 // value we got is a null. Otherwise, we need to recompile. | |
548 if (!dest_method->return_type()->is_loaded()) { | |
549 #ifndef PRODUCT | |
550 if (PrintOpto && (Verbose || WizardMode)) { | |
551 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
552 dest_method->print_name(); tty->cr(); | |
553 } | |
554 #endif | |
555 if (C->log() != NULL) { | |
556 C->log()->elem("assert_null reason='return' klass='%d'", | |
557 C->log()->identify(dest_method->return_type())); | |
558 } | |
559 // If there is going to be a trap, put it at the next bytecode: | |
560 set_bci(iter().next_bci()); | |
561 do_null_assert(peek(), T_OBJECT); | |
562 set_bci(iter().cur_bci()); // put it back | |
563 } | |
564 } | |
565 | |
566 // Restart record of parsing work after possible inlining of call | |
567 #ifndef PRODUCT | |
568 parse_histogram()->set_initial_state(bc()); | |
569 #endif | |
570 } | |
571 | |
572 //---------------------------catch_call_exceptions----------------------------- | |
573 // Put a Catch and CatchProj nodes behind a just-created call. | |
574 // Send their caught exceptions to the proper handler. | |
575 // This may be used after a call to the rethrow VM stub, | |
576 // when it is needed to process unloaded exception classes. | |
577 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
578 // Exceptions are delivered through this channel: | |
579 Node* i_o = this->i_o(); | |
580 | |
581 // Add a CatchNode. | |
582 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
583 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
584 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
585 | |
586 for (; !handlers.is_done(); handlers.next()) { | |
587 ciExceptionHandler* h = handlers.handler(); | |
588 int h_bci = h->handler_bci(); | |
589 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
590 // Do not introduce unloaded exception types into the graph: | |
591 if (!h_klass->is_loaded()) { | |
592 if (saw_unloaded->contains(h_bci)) { | |
593 /* We've already seen an unloaded exception with h_bci, | |
594 so don't duplicate. Duplication will cause the CatchNode to be | |
595 unnecessarily large. See 4713716. */ | |
596 continue; | |
597 } else { | |
598 saw_unloaded->append(h_bci); | |
599 } | |
600 } | |
601 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
602 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
603 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
604 assert(!h_extype->empty(), "sanity"); | |
605 // Note: It's OK if the BCIs repeat themselves. | |
606 bcis->append(h_bci); | |
607 extypes->append(h_extype); | |
608 } | |
609 | |
610 int len = bcis->length(); | |
611 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
612 Node *catch_ = _gvn.transform(cn); | |
613 | |
614 // now branch with the exception state to each of the (potential) | |
615 // handlers | |
616 for(int i=0; i < len; i++) { | |
617 // Setup JVM state to enter the handler. | |
618 PreserveJVMState pjvms(this); | |
619 // Locals are just copied from before the call. | |
620 // Get control from the CatchNode. | |
621 int handler_bci = bcis->at(i); | |
622 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
623 // This handler cannot happen? | |
624 if (ctrl == top()) continue; | |
625 set_control(ctrl); | |
626 | |
627 // Create exception oop | |
628 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
629 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
630 | |
631 // Handle unloaded exception classes. | |
632 if (saw_unloaded->contains(handler_bci)) { | |
633 // An unloaded exception type is coming here. Do an uncommon trap. | |
634 #ifndef PRODUCT | |
635 // We do not expect the same handler bci to take both cold unloaded | |
636 // and hot loaded exceptions. But, watch for it. | |
637 if (extype->is_loaded()) { | |
638 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
639 method()->print_name(); tty->cr(); | |
640 } else if (PrintOpto && (Verbose || WizardMode)) { | |
641 tty->print("Bailing out on unloaded exception type "); | |
642 extype->klass()->print_name(); | |
643 tty->print(" at bci:%d in ", bci()); | |
644 method()->print_name(); tty->cr(); | |
645 } | |
646 #endif | |
647 // Emit an uncommon trap instead of processing the block. | |
648 set_bci(handler_bci); | |
649 push_ex_oop(ex_oop); | |
650 uncommon_trap(Deoptimization::Reason_unloaded, | |
651 Deoptimization::Action_reinterpret, | |
652 extype->klass(), "!loaded exception"); | |
653 set_bci(iter().cur_bci()); // put it back | |
654 continue; | |
655 } | |
656 | |
657 // go to the exception handler | |
658 if (handler_bci < 0) { // merge with corresponding rethrow node | |
659 throw_to_exit(make_exception_state(ex_oop)); | |
660 } else { // Else jump to corresponding handle | |
661 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
662 merge_exception(handler_bci); | |
663 } | |
664 } | |
665 | |
666 // The first CatchProj is for the normal return. | |
667 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
668 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
669 } | |
670 | |
671 | |
672 //----------------------------catch_inline_exceptions-------------------------- | |
673 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
674 // Common case 1: we have no handler, so all exceptions merge right into | |
675 // the rethrow case. | |
676 // Case 2: we have some handlers, with loaded exception klasses that have | |
677 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
678 // exception oop and branch to the handler directly. | |
679 // Case 3: We have some handlers with subklasses or are not loaded at | |
680 // compile-time. We have to call the runtime to resolve the exception. | |
681 // So we insert a RethrowCall and all the logic that goes with it. | |
682 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
683 // Caller is responsible for saving away the map for normal control flow! | |
684 assert(stopped(), "call set_map(NULL) first"); | |
685 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
686 | |
687 Node* ex_node = saved_ex_oop(ex_map); | |
688 if (ex_node == top()) { | |
689 // No action needed. | |
690 return; | |
691 } | |
692 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
693 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
694 if (ex_type == NULL) | |
695 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
696 | |
697 // determine potential exception handlers | |
698 ciExceptionHandlerStream handlers(method(), bci(), | |
699 ex_type->klass()->as_instance_klass(), | |
700 ex_type->klass_is_exact()); | |
701 | |
702 // Start executing from the given throw state. (Keep its stack, for now.) | |
703 // Get the exception oop as known at compile time. | |
704 ex_node = use_exception_state(ex_map); | |
705 | |
706 // Get the exception oop klass from its header | |
707 Node* ex_klass_node = NULL; | |
708 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
709 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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710 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 711 |
712 // Compute the exception klass a little more cleverly. | |
713 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
714 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
715 // each arm of the Phi. If I know something clever about the exceptions | |
716 // I'm loading the class from, I can replace the LoadKlass with the | |
717 // klass constant for the exception oop. | |
718 if( ex_node->is_Phi() ) { | |
719 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
720 for( uint i = 1; i < ex_node->req(); i++ ) { | |
721 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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722 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 723 ex_klass_node->init_req( i, k ); |
724 } | |
725 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
726 | |
727 } | |
728 } | |
729 | |
730 // Scan the exception table for applicable handlers. | |
731 // If none, we can call rethrow() and be done! | |
732 // If precise (loaded with no subklasses), insert a D.S. style | |
733 // pointer compare to the correct handler and loop back. | |
734 // If imprecise, switch to the Rethrow VM-call style handling. | |
735 | |
736 int remaining = handlers.count_remaining(); | |
737 | |
738 // iterate through all entries sequentially | |
739 for (;!handlers.is_done(); handlers.next()) { | |
740 ciExceptionHandler* handler = handlers.handler(); | |
741 | |
742 if (handler->is_rethrow()) { | |
743 // If we fell off the end of the table without finding an imprecise | |
744 // exception klass (and without finding a generic handler) then we | |
745 // know this exception is not handled in this method. We just rethrow | |
746 // the exception into the caller. | |
747 throw_to_exit(make_exception_state(ex_node)); | |
748 return; | |
749 } | |
750 | |
751 // exception handler bci range covers throw_bci => investigate further | |
752 int handler_bci = handler->handler_bci(); | |
753 | |
754 if (remaining == 1) { | |
755 push_ex_oop(ex_node); // Push exception oop for handler | |
756 #ifndef PRODUCT | |
757 if (PrintOpto && WizardMode) { | |
758 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
759 } | |
760 #endif | |
761 merge_exception(handler_bci); // jump to handler | |
762 return; // No more handling to be done here! | |
763 } | |
764 | |
1344 | 765 // Get the handler's klass |
0 | 766 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 767 |
768 if (!klass->is_loaded()) { // klass is not loaded? | |
769 // fall through into catch_call_exceptions which will emit a | |
770 // handler with an uncommon trap. | |
771 break; | |
0 | 772 } |
773 | |
774 if (klass->is_interface()) // should not happen, but... | |
775 break; // bail out | |
776 | |
1344 | 777 // Check the type of the exception against the catch type |
0 | 778 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
779 Node* con = _gvn.makecon(tk); | |
1344 | 780 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
781 if (!stopped()) { | |
782 PreserveJVMState pjvms(this); | |
783 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
784 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
0 | 785 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
786 push_ex_oop(ex_oop); // Push exception oop for handler | |
787 #ifndef PRODUCT | |
788 if (PrintOpto && WizardMode) { | |
789 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
790 klass->print_name(); | |
791 tty->cr(); | |
792 } | |
793 #endif | |
794 merge_exception(handler_bci); | |
795 } | |
1344 | 796 set_control(not_subtype_ctrl); |
0 | 797 |
798 // Come here if exception does not match handler. | |
799 // Carry on with more handler checks. | |
800 --remaining; | |
801 } | |
802 | |
803 assert(!stopped(), "you should return if you finish the chain"); | |
804 | |
805 // Oops, need to call into the VM to resolve the klasses at runtime. | |
806 // Note: This call must not deoptimize, since it is not a real at this bci! | |
807 kill_dead_locals(); | |
808 | |
809 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
810 OptoRuntime::rethrow_Type(), | |
811 OptoRuntime::rethrow_stub(), | |
812 NULL, NULL, | |
813 ex_node); | |
814 | |
815 // Rethrow is a pure call, no side effects, only a result. | |
816 // The result cannot be allocated, so we use I_O | |
817 | |
818 // Catch exceptions from the rethrow | |
819 catch_call_exceptions(handlers); | |
820 } | |
821 | |
822 | |
823 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
824 | |
825 | |
826 #ifndef PRODUCT | |
827 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
828 if( CountCompiledCalls ) { | |
829 if( at_method_entry ) { | |
830 // bump invocation counter if top method (for statistics) | |
831 if (CountCompiledCalls && depth() == 1) { | |
832 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
833 Node* adr1 = makecon(addr_type); | |
834 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
835 increment_counter(adr2); | |
836 } | |
837 } else if (is_inline) { | |
838 switch (bc()) { | |
839 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
840 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
841 case Bytecodes::_invokestatic: | |
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842 case Bytecodes::_invokedynamic: |
0 | 843 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
844 default: fatal("unexpected call bytecode"); | |
845 } | |
846 } else { | |
847 switch (bc()) { | |
848 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
849 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
850 case Bytecodes::_invokestatic: | |
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851 case Bytecodes::_invokedynamic: |
0 | 852 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
853 default: fatal("unexpected call bytecode"); | |
854 } | |
855 } | |
856 } | |
857 } | |
858 #endif //PRODUCT | |
859 | |
860 | |
861 // Identify possible target method and inlining style | |
862 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
863 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
864 // only use for virtual or interface calls | |
865 | |
866 // If it is obviously final, do not bother to call find_monomorphic_target, | |
867 // because the class hierarchy checks are not needed, and may fail due to | |
868 // incompletely loaded classes. Since we do our own class loading checks | |
869 // in this module, we may confidently bind to any method. | |
870 if (dest_method->can_be_statically_bound()) { | |
871 return dest_method; | |
872 } | |
873 | |
874 // Attempt to improve the receiver | |
875 bool actual_receiver_is_exact = false; | |
876 ciInstanceKlass* actual_receiver = klass; | |
877 if (receiver_type != NULL) { | |
878 // Array methods are all inherited from Object, and are monomorphic. | |
879 if (receiver_type->isa_aryptr() && | |
880 dest_method->holder() == env()->Object_klass()) { | |
881 return dest_method; | |
882 } | |
883 | |
884 // All other interesting cases are instance klasses. | |
885 if (!receiver_type->isa_instptr()) { | |
886 return NULL; | |
887 } | |
888 | |
889 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
890 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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891 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 892 // ikl is a same or better type than the original actual_receiver, |
893 // e.g. static receiver from bytecodes. | |
894 actual_receiver = ikl; | |
895 // Is the actual_receiver exact? | |
896 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
897 } | |
898 } | |
899 | |
900 ciInstanceKlass* calling_klass = caller->holder(); | |
901 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
902 if (cha_monomorphic_target != NULL) { | |
903 assert(!cha_monomorphic_target->is_abstract(), ""); | |
904 // Look at the method-receiver type. Does it add "too much information"? | |
905 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
906 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
907 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
908 // Calling this method would include an implicit cast to its holder. | |
909 // %%% Not yet implemented. Would throw minor asserts at present. | |
910 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
911 // To fix, put the higher_equal check at the call of this routine, | |
912 // and add a CheckCastPP to the receiver. | |
913 if (TraceDependencies) { | |
914 tty->print_cr("found unique CHA method, but could not cast up"); | |
915 tty->print(" method = "); | |
916 cha_monomorphic_target->print(); | |
917 tty->cr(); | |
918 } | |
919 if (C->log() != NULL) { | |
920 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
921 C->log()->identify(klass), | |
922 C->log()->identify(cha_monomorphic_target)); | |
923 } | |
924 cha_monomorphic_target = NULL; | |
925 } | |
926 } | |
927 if (cha_monomorphic_target != NULL) { | |
928 // Hardwiring a virtual. | |
929 // If we inlined because CHA revealed only a single target method, | |
930 // then we are dependent on that target method not getting overridden | |
931 // by dynamic class loading. Be sure to test the "static" receiver | |
932 // dest_method here, as opposed to the actual receiver, which may | |
933 // falsely lead us to believe that the receiver is final or private. | |
934 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
935 return cha_monomorphic_target; | |
936 } | |
937 | |
938 // If the type is exact, we can still bind the method w/o a vcall. | |
939 // (This case comes after CHA so we can see how much extra work it does.) | |
940 if (actual_receiver_is_exact) { | |
941 // In case of evolution, there is a dependence on every inlined method, since each | |
942 // such method can be changed when its class is redefined. | |
943 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
944 if (exact_method != NULL) { | |
945 #ifndef PRODUCT | |
946 if (PrintOpto) { | |
947 tty->print(" Calling method via exact type @%d --- ", bci); | |
948 exact_method->print_name(); | |
949 tty->cr(); | |
950 } | |
951 #endif | |
952 return exact_method; | |
953 } | |
954 } | |
955 | |
956 return NULL; | |
957 } |