Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/doCall.cpp @ 2405:3d58a4983660
7022998: JSR 292 recursive method handle calls inline themselves infinitely
Reviewed-by: never, kvn
author | twisti |
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date | Mon, 28 Mar 2011 03:58:07 -0700 |
parents | f95d63e2154a |
children | 4124a5a27707 |
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; |
66 | |
67 // Dtrace currently doesn't work unless all calls are vanilla | |
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68 if (env()->dtrace_method_probes()) { |
0 | 69 allow_inline = false; |
70 } | |
71 | |
72 // Note: When we get profiling during stage-1 compiles, we want to pull | |
73 // from more specific profile data which pertains to this inlining. | |
74 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
75 ciCallProfile profile = jvms->method()->call_profile_at_bci(jvms->bci()); | |
76 | |
77 // See how many times this site has been invoked. | |
78 int site_count = profile.count(); | |
79 int receiver_count = -1; | |
80 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) { | |
81 // Receivers in the profile structure are ordered by call counts | |
82 // so that the most called (major) receiver is profile.receiver(0). | |
83 receiver_count = profile.receiver_count(0); | |
84 } | |
85 | |
86 CompileLog* log = this->log(); | |
87 if (log != NULL) { | |
88 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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89 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
0 | 90 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
91 log->identify(call_method), site_count, prof_factor); | |
92 if (call_is_virtual) log->print(" virtual='1'"); | |
93 if (allow_inline) log->print(" inline='1'"); | |
94 if (receiver_count >= 0) { | |
95 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
96 if (profile.has_receiver(1)) { | |
97 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
98 } | |
99 } | |
100 log->end_elem(); | |
101 } | |
102 | |
103 // Special case the handling of certain common, profitable library | |
104 // methods. If these methods are replaced with specialized code, | |
105 // then we return it as the inlined version of the call. | |
106 // We do this before the strict f.p. check below because the | |
107 // intrinsics handle strict f.p. correctly. | |
108 if (allow_inline) { | |
109 cg = find_intrinsic(call_method, call_is_virtual); | |
110 if (cg != NULL) return cg; | |
111 } | |
112 | |
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113 // Do MethodHandle calls. |
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114 // NOTE: This must happen before normal inlining logic below since |
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115 // MethodHandle.invoke* are native methods which obviously don't |
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116 // have bytecodes and so normal inlining fails. |
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117 if (call_method->is_method_handle_invoke()) { |
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118 if (jvms->method()->java_code_at_bci(jvms->bci()) != Bytecodes::_invokedynamic) { |
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119 GraphKit kit(jvms); |
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120 Node* n = kit.argument(0); |
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121 |
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122 if (n->Opcode() == Op_ConP) { |
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123 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr(); |
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124 ciObject* const_oop = oop_ptr->const_oop(); |
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125 ciMethodHandle* method_handle = const_oop->as_method_handle(); |
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126 |
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127 // Set the actually called method to have access to the class |
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128 // and signature in the MethodHandleCompiler. |
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129 method_handle->set_callee(call_method); |
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130 |
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131 // Get an adapter for the MethodHandle. |
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132 ciMethod* target_method = method_handle->get_method_handle_adapter(); |
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133 |
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134 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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135 if (hit_cg != NULL && hit_cg->is_inline()) |
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136 return hit_cg; |
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137 } |
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138 |
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139 return CallGenerator::for_direct_call(call_method); |
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140 } |
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141 else { |
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142 // Get the MethodHandle from the CallSite. |
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143 ciMethod* caller_method = jvms->method(); |
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144 ciBytecodeStream str(caller_method); |
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145 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci. |
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146 ciCallSite* call_site = str.get_call_site(); |
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147 ciMethodHandle* method_handle = call_site->get_target(); |
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148 |
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149 // Set the actually called method to have access to the class |
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150 // and signature in the MethodHandleCompiler. |
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151 method_handle->set_callee(call_method); |
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152 |
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153 // Get an adapter for the MethodHandle. |
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154 ciMethod* target_method = method_handle->get_invokedynamic_adapter(); |
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155 |
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156 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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157 if (hit_cg != NULL && hit_cg->is_inline()) { |
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158 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method); |
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159 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor); |
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160 } |
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161 |
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162 // If something failed, generate a normal dynamic call. |
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163 return CallGenerator::for_dynamic_call(call_method); |
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164 } |
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165 } |
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166 |
0 | 167 // Do not inline strict fp into non-strict code, or the reverse |
168 bool caller_method_is_strict = jvms->method()->is_strict(); | |
169 if( caller_method_is_strict ^ call_method->is_strict() ) { | |
170 allow_inline = false; | |
171 } | |
172 | |
173 // Attempt to inline... | |
174 if (allow_inline) { | |
175 // The profile data is only partly attributable to this caller, | |
176 // scale back the call site information. | |
177 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
178 // This is the number of times we expect the call code to be used. | |
179 float expected_uses = past_uses; | |
180 | |
181 // Try inlining a bytecoded method: | |
182 if (!call_is_virtual) { | |
183 InlineTree* ilt; | |
184 if (UseOldInlining) { | |
185 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
186 } else { | |
187 // Make a disembodied, stateless ILT. | |
188 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
189 float site_invoke_ratio = prof_factor; | |
190 // Note: ilt is for the root of this parse, not the present call site. | |
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191 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0); |
0 | 192 } |
193 WarmCallInfo scratch_ci; | |
194 if (!UseOldInlining) | |
195 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
196 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
197 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
198 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
199 bool require_inline = (allow_inline && ci->is_hot()); | |
200 | |
201 if (allow_inline) { | |
202 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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203 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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204 // Delay the inlining of this method to give us the |
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205 // opportunity to perform some high level optimizations |
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206 // first. |
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207 return CallGenerator::for_late_inline(call_method, cg); |
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208 } |
0 | 209 if (cg == NULL) { |
210 // Fall through. | |
211 } else if (require_inline || !InlineWarmCalls) { | |
212 return cg; | |
213 } else { | |
214 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
215 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
216 } | |
217 } | |
218 } | |
219 | |
220 // Try using the type profile. | |
221 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
222 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
223 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
224 ciMethod* receiver_method = NULL; | |
225 if (have_major_receiver || profile.morphism() == 1 || | |
226 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
227 // receiver_method = profile.method(); | |
228 // Profiles do not suggest methods now. Look it up in the major receiver. | |
229 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
230 profile.receiver(0)); | |
231 } | |
232 if (receiver_method != NULL) { | |
233 // The single majority receiver sufficiently outweighs the minority. | |
234 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
235 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
236 if (hit_cg != NULL) { | |
237 // Look up second receiver. | |
238 CallGenerator* next_hit_cg = NULL; | |
239 ciMethod* next_receiver_method = NULL; | |
240 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
241 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
242 profile.receiver(1)); | |
243 if (next_receiver_method != NULL) { | |
244 next_hit_cg = this->call_generator(next_receiver_method, | |
245 vtable_index, !call_is_virtual, jvms, | |
246 allow_inline, prof_factor); | |
247 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
248 have_major_receiver && UseOnlyInlinedBimorphic) { | |
249 // Skip if we can't inline second receiver's method | |
250 next_hit_cg = NULL; | |
251 } | |
252 } | |
253 } | |
254 CallGenerator* miss_cg; | |
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255 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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256 Deoptimization::Reason_bimorphic : |
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257 Deoptimization::Reason_class_check; |
0 | 258 if (( profile.morphism() == 1 || |
259 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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260 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 261 ) { |
262 // Generate uncommon trap for class check failure path | |
263 // in case of monomorphic or bimorphic virtual call site. | |
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264 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
0 | 265 Deoptimization::Action_maybe_recompile); |
266 } else { | |
267 // Generate virtual call for class check failure path | |
268 // in case of polymorphic virtual call site. | |
269 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
270 } | |
271 if (miss_cg != NULL) { | |
272 if (next_hit_cg != NULL) { | |
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273 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 | 274 // We don't need to record dependency on a receiver here and below. |
275 // Whenever we inline, the dependency is added by Parse::Parse(). | |
276 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
277 } | |
278 if (miss_cg != NULL) { | |
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279 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
0 | 280 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
281 if (cg != NULL) return cg; | |
282 } | |
283 } | |
284 } | |
285 } | |
286 } | |
287 } | |
288 | |
289 // There was no special inlining tactic, or it bailed out. | |
290 // Use a more generic tactic, like a simple call. | |
291 if (call_is_virtual) { | |
292 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
293 } else { | |
294 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
295 // or it is a static or special call. | |
1080
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296 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
0 | 297 } |
298 } | |
299 | |
1080
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300 // Return true for methods that shouldn't be inlined early so that |
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301 // they are easier to analyze and optimize as intrinsics. |
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302 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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303 if (has_stringbuilder()) { |
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304 |
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305 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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306 call_method->holder() == C->env()->StringBuffer_klass()) && |
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307 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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308 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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309 // Delay SB calls only when called from non-SB code |
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310 return false; |
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311 } |
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312 |
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313 switch (call_method->intrinsic_id()) { |
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314 case vmIntrinsics::_StringBuilder_void: |
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315 case vmIntrinsics::_StringBuilder_int: |
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316 case vmIntrinsics::_StringBuilder_String: |
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317 case vmIntrinsics::_StringBuilder_append_char: |
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318 case vmIntrinsics::_StringBuilder_append_int: |
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319 case vmIntrinsics::_StringBuilder_append_String: |
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320 case vmIntrinsics::_StringBuilder_toString: |
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321 case vmIntrinsics::_StringBuffer_void: |
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322 case vmIntrinsics::_StringBuffer_int: |
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323 case vmIntrinsics::_StringBuffer_String: |
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324 case vmIntrinsics::_StringBuffer_append_char: |
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325 case vmIntrinsics::_StringBuffer_append_int: |
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326 case vmIntrinsics::_StringBuffer_append_String: |
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327 case vmIntrinsics::_StringBuffer_toString: |
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328 case vmIntrinsics::_Integer_toString: |
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329 return true; |
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330 |
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331 case vmIntrinsics::_String_String: |
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332 { |
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333 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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334 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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335 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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336 ciMethod* m = csj->method(); |
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337 if (m != NULL && |
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338 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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339 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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340 // Delay String.<init>(new SB()) |
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341 return true; |
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342 } |
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343 return false; |
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344 } |
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345 |
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346 default: |
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347 return false; |
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348 } |
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349 } |
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350 return false; |
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351 } |
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352 |
0 | 353 |
354 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
355 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
356 // Additional inputs to consider... | |
357 // bc = bc() | |
358 // caller = method() | |
359 // iter().get_method_holder_index() | |
360 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
361 // Interface classes can be loaded & linked and never get around to | |
362 // being initialized. Uncommon-trap for not-initialized static or | |
363 // v-calls. Let interface calls happen. | |
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364 ciInstanceKlass* holder_klass = dest_method->holder(); |
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365 if (!holder_klass->is_being_initialized() && |
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366 !holder_klass->is_initialized() && |
0 | 367 !holder_klass->is_interface()) { |
368 uncommon_trap(Deoptimization::Reason_uninitialized, | |
369 Deoptimization::Action_reinterpret, | |
370 holder_klass); | |
371 return true; | |
372 } | |
373 | |
374 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
375 return false; | |
376 } | |
377 | |
378 | |
379 //------------------------------do_call---------------------------------------- | |
380 // Handle your basic call. Inline if we can & want to, else just setup call. | |
381 void Parse::do_call() { | |
382 // It's likely we are going to add debug info soon. | |
383 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
384 // our contribution to it is cleaned up right here. | |
385 kill_dead_locals(); | |
386 | |
387 // Set frequently used booleans | |
388 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
389 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
390 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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391 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
0 | 392 |
393 // Find target being called | |
394 bool will_link; | |
395 ciMethod* dest_method = iter().get_method(will_link); | |
396 ciInstanceKlass* holder_klass = dest_method->holder(); | |
397 ciKlass* holder = iter().get_declared_method_holder(); | |
398 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
399 | |
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400 int nargs = dest_method->arg_size(); |
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401 if (is_invokedynamic) nargs -= 1; |
0 | 402 |
403 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
404 // bailout when too many arguments for register representation | |
405 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
406 #ifndef PRODUCT | |
407 if (PrintOpto && (Verbose || WizardMode)) { | |
408 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
409 dest_method->print_name(); tty->cr(); | |
410 } | |
411 #endif | |
412 return; | |
413 } | |
414 assert(holder_klass->is_loaded(), ""); | |
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415 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
0 | 416 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
417 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
418 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
419 // Note: In the absence of miranda methods, an abstract class K can perform | |
420 // an invokevirtual directly on an interface method I.m if K implements I. | |
421 | |
422 // --------------------- | |
423 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
424 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
425 // Does the call-site type profile reveal only one receiver? | |
426 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
427 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
428 | |
429 // Choose call strategy. | |
430 bool call_is_virtual = is_virtual_or_interface; | |
431 int vtable_index = methodOopDesc::invalid_vtable_index; | |
432 ciMethod* call_method = dest_method; | |
433 | |
434 // Try to get the most accurate receiver type | |
435 if (is_virtual_or_interface) { | |
436 Node* receiver_node = stack(sp() - nargs); | |
437 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
438 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
439 | |
440 // Have the call been sufficiently improved such that it is no longer a virtual? | |
441 if (optimized_virtual_method != NULL) { | |
442 call_method = optimized_virtual_method; | |
443 call_is_virtual = false; | |
444 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
445 // We can make a vtable call at this site | |
446 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
447 } | |
448 } | |
449 | |
450 // Note: It's OK to try to inline a virtual call. | |
451 // The call generator will not attempt to inline a polymorphic call | |
452 // unless it knows how to optimize the receiver dispatch. | |
453 bool try_inline = (C->do_inlining() || InlineAccessors); | |
454 | |
455 // --------------------- | |
456 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
457 JVMState* jvms = sync_jvms(); | |
458 | |
459 // --------------------- | |
460 // Decide call tactic. | |
461 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
462 // It decides whether inlining is desirable or not. | |
463 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
464 | |
465 // --------------------- | |
466 // Round double arguments before call | |
467 round_double_arguments(dest_method); | |
468 | |
469 #ifndef PRODUCT | |
470 // bump global counters for calls | |
471 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
472 | |
473 // Record first part of parsing work for this call | |
474 parse_histogram()->record_change(); | |
475 #endif // not PRODUCT | |
476 | |
477 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
478 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
479 | |
480 // save across call, for a subsequent cast_not_null. | |
481 Node* receiver = has_receiver ? argument(0) : NULL; | |
482 | |
483 // Bump method data counters (We profile *before* the call is made | |
484 // because exceptions don't return to the call site.) | |
485 profile_call(receiver); | |
486 | |
487 JVMState* new_jvms; | |
488 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
489 // When inlining attempt fails (e.g., too many arguments), | |
490 // it may contaminate the current compile state, making it | |
491 // impossible to pull back and try again. Once we call | |
492 // cg->generate(), we are committed. If it fails, the whole | |
493 // compilation task is compromised. | |
494 if (failing()) return; | |
495 #ifndef PRODUCT | |
496 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
497 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
498 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
499 tty->print("Bailed out of intrinsic, will not inline: "); | |
500 call_method->print_name(); tty->cr(); | |
501 } | |
502 } | |
503 #endif | |
504 // This can happen if a library intrinsic is available, but refuses | |
505 // the call site, perhaps because it did not match a pattern the | |
506 // intrinsic was expecting to optimize. The fallback position is | |
507 // to call out-of-line. | |
508 try_inline = false; // Inline tactic bailed out. | |
509 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
510 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
511 guarantee(failing(), "call failed to generate: calls should work"); | |
512 return; | |
513 } | |
514 } | |
515 | |
516 if (cg->is_inline()) { | |
67 | 517 // Accumulate has_loops estimate |
518 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
0 | 519 C->env()->notice_inlined_method(call_method); |
520 } | |
521 | |
522 // Reset parser state from [new_]jvms, which now carries results of the call. | |
523 // Return value (if any) is already pushed on the stack by the cg. | |
524 add_exception_states_from(new_jvms); | |
525 if (new_jvms->map()->control() == top()) { | |
526 stop_and_kill_map(); | |
527 } else { | |
528 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
529 set_jvms(new_jvms); | |
530 } | |
531 | |
532 if (!stopped()) { | |
533 // This was some sort of virtual call, which did a null check for us. | |
534 // Now we can assert receiver-not-null, on the normal return path. | |
535 if (receiver != NULL && cg->is_virtual()) { | |
536 Node* cast = cast_not_null(receiver); | |
537 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
538 } | |
539 | |
540 // Round double result after a call from strict to non-strict code | |
541 round_double_result(dest_method); | |
542 | |
543 // If the return type of the method is not loaded, assert that the | |
544 // value we got is a null. Otherwise, we need to recompile. | |
545 if (!dest_method->return_type()->is_loaded()) { | |
546 #ifndef PRODUCT | |
547 if (PrintOpto && (Verbose || WizardMode)) { | |
548 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
549 dest_method->print_name(); tty->cr(); | |
550 } | |
551 #endif | |
552 if (C->log() != NULL) { | |
553 C->log()->elem("assert_null reason='return' klass='%d'", | |
554 C->log()->identify(dest_method->return_type())); | |
555 } | |
556 // If there is going to be a trap, put it at the next bytecode: | |
557 set_bci(iter().next_bci()); | |
558 do_null_assert(peek(), T_OBJECT); | |
559 set_bci(iter().cur_bci()); // put it back | |
560 } | |
561 } | |
562 | |
563 // Restart record of parsing work after possible inlining of call | |
564 #ifndef PRODUCT | |
565 parse_histogram()->set_initial_state(bc()); | |
566 #endif | |
567 } | |
568 | |
569 //---------------------------catch_call_exceptions----------------------------- | |
570 // Put a Catch and CatchProj nodes behind a just-created call. | |
571 // Send their caught exceptions to the proper handler. | |
572 // This may be used after a call to the rethrow VM stub, | |
573 // when it is needed to process unloaded exception classes. | |
574 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
575 // Exceptions are delivered through this channel: | |
576 Node* i_o = this->i_o(); | |
577 | |
578 // Add a CatchNode. | |
579 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
580 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
581 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
582 | |
583 for (; !handlers.is_done(); handlers.next()) { | |
584 ciExceptionHandler* h = handlers.handler(); | |
585 int h_bci = h->handler_bci(); | |
586 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
587 // Do not introduce unloaded exception types into the graph: | |
588 if (!h_klass->is_loaded()) { | |
589 if (saw_unloaded->contains(h_bci)) { | |
590 /* We've already seen an unloaded exception with h_bci, | |
591 so don't duplicate. Duplication will cause the CatchNode to be | |
592 unnecessarily large. See 4713716. */ | |
593 continue; | |
594 } else { | |
595 saw_unloaded->append(h_bci); | |
596 } | |
597 } | |
598 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
599 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
600 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
601 assert(!h_extype->empty(), "sanity"); | |
602 // Note: It's OK if the BCIs repeat themselves. | |
603 bcis->append(h_bci); | |
604 extypes->append(h_extype); | |
605 } | |
606 | |
607 int len = bcis->length(); | |
608 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
609 Node *catch_ = _gvn.transform(cn); | |
610 | |
611 // now branch with the exception state to each of the (potential) | |
612 // handlers | |
613 for(int i=0; i < len; i++) { | |
614 // Setup JVM state to enter the handler. | |
615 PreserveJVMState pjvms(this); | |
616 // Locals are just copied from before the call. | |
617 // Get control from the CatchNode. | |
618 int handler_bci = bcis->at(i); | |
619 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
620 // This handler cannot happen? | |
621 if (ctrl == top()) continue; | |
622 set_control(ctrl); | |
623 | |
624 // Create exception oop | |
625 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
626 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
627 | |
628 // Handle unloaded exception classes. | |
629 if (saw_unloaded->contains(handler_bci)) { | |
630 // An unloaded exception type is coming here. Do an uncommon trap. | |
631 #ifndef PRODUCT | |
632 // We do not expect the same handler bci to take both cold unloaded | |
633 // and hot loaded exceptions. But, watch for it. | |
634 if (extype->is_loaded()) { | |
635 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
636 method()->print_name(); tty->cr(); | |
637 } else if (PrintOpto && (Verbose || WizardMode)) { | |
638 tty->print("Bailing out on unloaded exception type "); | |
639 extype->klass()->print_name(); | |
640 tty->print(" at bci:%d in ", bci()); | |
641 method()->print_name(); tty->cr(); | |
642 } | |
643 #endif | |
644 // Emit an uncommon trap instead of processing the block. | |
645 set_bci(handler_bci); | |
646 push_ex_oop(ex_oop); | |
647 uncommon_trap(Deoptimization::Reason_unloaded, | |
648 Deoptimization::Action_reinterpret, | |
649 extype->klass(), "!loaded exception"); | |
650 set_bci(iter().cur_bci()); // put it back | |
651 continue; | |
652 } | |
653 | |
654 // go to the exception handler | |
655 if (handler_bci < 0) { // merge with corresponding rethrow node | |
656 throw_to_exit(make_exception_state(ex_oop)); | |
657 } else { // Else jump to corresponding handle | |
658 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
659 merge_exception(handler_bci); | |
660 } | |
661 } | |
662 | |
663 // The first CatchProj is for the normal return. | |
664 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
665 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
666 } | |
667 | |
668 | |
669 //----------------------------catch_inline_exceptions-------------------------- | |
670 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
671 // Common case 1: we have no handler, so all exceptions merge right into | |
672 // the rethrow case. | |
673 // Case 2: we have some handlers, with loaded exception klasses that have | |
674 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
675 // exception oop and branch to the handler directly. | |
676 // Case 3: We have some handlers with subklasses or are not loaded at | |
677 // compile-time. We have to call the runtime to resolve the exception. | |
678 // So we insert a RethrowCall and all the logic that goes with it. | |
679 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
680 // Caller is responsible for saving away the map for normal control flow! | |
681 assert(stopped(), "call set_map(NULL) first"); | |
682 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
683 | |
684 Node* ex_node = saved_ex_oop(ex_map); | |
685 if (ex_node == top()) { | |
686 // No action needed. | |
687 return; | |
688 } | |
689 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
690 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
691 if (ex_type == NULL) | |
692 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
693 | |
694 // determine potential exception handlers | |
695 ciExceptionHandlerStream handlers(method(), bci(), | |
696 ex_type->klass()->as_instance_klass(), | |
697 ex_type->klass_is_exact()); | |
698 | |
699 // Start executing from the given throw state. (Keep its stack, for now.) | |
700 // Get the exception oop as known at compile time. | |
701 ex_node = use_exception_state(ex_map); | |
702 | |
703 // Get the exception oop klass from its header | |
704 Node* ex_klass_node = NULL; | |
705 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
706 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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707 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 708 |
709 // Compute the exception klass a little more cleverly. | |
710 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
711 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
712 // each arm of the Phi. If I know something clever about the exceptions | |
713 // I'm loading the class from, I can replace the LoadKlass with the | |
714 // klass constant for the exception oop. | |
715 if( ex_node->is_Phi() ) { | |
716 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
717 for( uint i = 1; i < ex_node->req(); i++ ) { | |
718 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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719 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 720 ex_klass_node->init_req( i, k ); |
721 } | |
722 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
723 | |
724 } | |
725 } | |
726 | |
727 // Scan the exception table for applicable handlers. | |
728 // If none, we can call rethrow() and be done! | |
729 // If precise (loaded with no subklasses), insert a D.S. style | |
730 // pointer compare to the correct handler and loop back. | |
731 // If imprecise, switch to the Rethrow VM-call style handling. | |
732 | |
733 int remaining = handlers.count_remaining(); | |
734 | |
735 // iterate through all entries sequentially | |
736 for (;!handlers.is_done(); handlers.next()) { | |
737 ciExceptionHandler* handler = handlers.handler(); | |
738 | |
739 if (handler->is_rethrow()) { | |
740 // If we fell off the end of the table without finding an imprecise | |
741 // exception klass (and without finding a generic handler) then we | |
742 // know this exception is not handled in this method. We just rethrow | |
743 // the exception into the caller. | |
744 throw_to_exit(make_exception_state(ex_node)); | |
745 return; | |
746 } | |
747 | |
748 // exception handler bci range covers throw_bci => investigate further | |
749 int handler_bci = handler->handler_bci(); | |
750 | |
751 if (remaining == 1) { | |
752 push_ex_oop(ex_node); // Push exception oop for handler | |
753 #ifndef PRODUCT | |
754 if (PrintOpto && WizardMode) { | |
755 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
756 } | |
757 #endif | |
758 merge_exception(handler_bci); // jump to handler | |
759 return; // No more handling to be done here! | |
760 } | |
761 | |
1344 | 762 // Get the handler's klass |
0 | 763 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 764 |
765 if (!klass->is_loaded()) { // klass is not loaded? | |
766 // fall through into catch_call_exceptions which will emit a | |
767 // handler with an uncommon trap. | |
768 break; | |
0 | 769 } |
770 | |
771 if (klass->is_interface()) // should not happen, but... | |
772 break; // bail out | |
773 | |
1344 | 774 // Check the type of the exception against the catch type |
0 | 775 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
776 Node* con = _gvn.makecon(tk); | |
1344 | 777 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
778 if (!stopped()) { | |
779 PreserveJVMState pjvms(this); | |
780 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
781 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
0 | 782 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
783 push_ex_oop(ex_oop); // Push exception oop for handler | |
784 #ifndef PRODUCT | |
785 if (PrintOpto && WizardMode) { | |
786 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
787 klass->print_name(); | |
788 tty->cr(); | |
789 } | |
790 #endif | |
791 merge_exception(handler_bci); | |
792 } | |
1344 | 793 set_control(not_subtype_ctrl); |
0 | 794 |
795 // Come here if exception does not match handler. | |
796 // Carry on with more handler checks. | |
797 --remaining; | |
798 } | |
799 | |
800 assert(!stopped(), "you should return if you finish the chain"); | |
801 | |
802 // Oops, need to call into the VM to resolve the klasses at runtime. | |
803 // Note: This call must not deoptimize, since it is not a real at this bci! | |
804 kill_dead_locals(); | |
805 | |
806 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
807 OptoRuntime::rethrow_Type(), | |
808 OptoRuntime::rethrow_stub(), | |
809 NULL, NULL, | |
810 ex_node); | |
811 | |
812 // Rethrow is a pure call, no side effects, only a result. | |
813 // The result cannot be allocated, so we use I_O | |
814 | |
815 // Catch exceptions from the rethrow | |
816 catch_call_exceptions(handlers); | |
817 } | |
818 | |
819 | |
820 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
821 | |
822 | |
823 #ifndef PRODUCT | |
824 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
825 if( CountCompiledCalls ) { | |
826 if( at_method_entry ) { | |
827 // bump invocation counter if top method (for statistics) | |
828 if (CountCompiledCalls && depth() == 1) { | |
829 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
830 Node* adr1 = makecon(addr_type); | |
831 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
832 increment_counter(adr2); | |
833 } | |
834 } else if (is_inline) { | |
835 switch (bc()) { | |
836 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
837 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
838 case Bytecodes::_invokestatic: | |
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839 case Bytecodes::_invokedynamic: |
0 | 840 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
841 default: fatal("unexpected call bytecode"); | |
842 } | |
843 } else { | |
844 switch (bc()) { | |
845 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
846 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
847 case Bytecodes::_invokestatic: | |
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848 case Bytecodes::_invokedynamic: |
0 | 849 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
850 default: fatal("unexpected call bytecode"); | |
851 } | |
852 } | |
853 } | |
854 } | |
855 #endif //PRODUCT | |
856 | |
857 | |
858 // Identify possible target method and inlining style | |
859 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
860 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
861 // only use for virtual or interface calls | |
862 | |
863 // If it is obviously final, do not bother to call find_monomorphic_target, | |
864 // because the class hierarchy checks are not needed, and may fail due to | |
865 // incompletely loaded classes. Since we do our own class loading checks | |
866 // in this module, we may confidently bind to any method. | |
867 if (dest_method->can_be_statically_bound()) { | |
868 return dest_method; | |
869 } | |
870 | |
871 // Attempt to improve the receiver | |
872 bool actual_receiver_is_exact = false; | |
873 ciInstanceKlass* actual_receiver = klass; | |
874 if (receiver_type != NULL) { | |
875 // Array methods are all inherited from Object, and are monomorphic. | |
876 if (receiver_type->isa_aryptr() && | |
877 dest_method->holder() == env()->Object_klass()) { | |
878 return dest_method; | |
879 } | |
880 | |
881 // All other interesting cases are instance klasses. | |
882 if (!receiver_type->isa_instptr()) { | |
883 return NULL; | |
884 } | |
885 | |
886 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
887 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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888 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 889 // ikl is a same or better type than the original actual_receiver, |
890 // e.g. static receiver from bytecodes. | |
891 actual_receiver = ikl; | |
892 // Is the actual_receiver exact? | |
893 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
894 } | |
895 } | |
896 | |
897 ciInstanceKlass* calling_klass = caller->holder(); | |
898 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
899 if (cha_monomorphic_target != NULL) { | |
900 assert(!cha_monomorphic_target->is_abstract(), ""); | |
901 // Look at the method-receiver type. Does it add "too much information"? | |
902 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
903 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
904 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
905 // Calling this method would include an implicit cast to its holder. | |
906 // %%% Not yet implemented. Would throw minor asserts at present. | |
907 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
908 // To fix, put the higher_equal check at the call of this routine, | |
909 // and add a CheckCastPP to the receiver. | |
910 if (TraceDependencies) { | |
911 tty->print_cr("found unique CHA method, but could not cast up"); | |
912 tty->print(" method = "); | |
913 cha_monomorphic_target->print(); | |
914 tty->cr(); | |
915 } | |
916 if (C->log() != NULL) { | |
917 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
918 C->log()->identify(klass), | |
919 C->log()->identify(cha_monomorphic_target)); | |
920 } | |
921 cha_monomorphic_target = NULL; | |
922 } | |
923 } | |
924 if (cha_monomorphic_target != NULL) { | |
925 // Hardwiring a virtual. | |
926 // If we inlined because CHA revealed only a single target method, | |
927 // then we are dependent on that target method not getting overridden | |
928 // by dynamic class loading. Be sure to test the "static" receiver | |
929 // dest_method here, as opposed to the actual receiver, which may | |
930 // falsely lead us to believe that the receiver is final or private. | |
931 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
932 return cha_monomorphic_target; | |
933 } | |
934 | |
935 // If the type is exact, we can still bind the method w/o a vcall. | |
936 // (This case comes after CHA so we can see how much extra work it does.) | |
937 if (actual_receiver_is_exact) { | |
938 // In case of evolution, there is a dependence on every inlined method, since each | |
939 // such method can be changed when its class is redefined. | |
940 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
941 if (exact_method != NULL) { | |
942 #ifndef PRODUCT | |
943 if (PrintOpto) { | |
944 tty->print(" Calling method via exact type @%d --- ", bci); | |
945 exact_method->print_name(); | |
946 tty->cr(); | |
947 } | |
948 #endif | |
949 return exact_method; | |
950 } | |
951 } | |
952 | |
953 return NULL; | |
954 } |