Mercurial > hg > truffle
annotate src/share/vm/opto/doCall.cpp @ 3743:33e2b8f1d466
6956668: misbehavior of XOR operator (^) with int
Summary: optimize cmp_ne(xor(X,1),0) to cmp_eq(X,0) only for boolean values X.
Reviewed-by: never
author | kvn |
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date | Tue, 31 May 2011 10:05:36 -0700 |
parents | fabcf26ee72f |
children | f56542cb325a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciCPCache.hpp" | |
27 #include "ci/ciCallSite.hpp" | |
28 #include "ci/ciMethodHandle.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
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30 #include "compiler/compileBroker.hpp" |
1972 | 31 #include "compiler/compileLog.hpp" |
32 #include "interpreter/linkResolver.hpp" | |
33 #include "opto/addnode.hpp" | |
34 #include "opto/callGenerator.hpp" | |
35 #include "opto/cfgnode.hpp" | |
36 #include "opto/mulnode.hpp" | |
37 #include "opto/parse.hpp" | |
38 #include "opto/rootnode.hpp" | |
39 #include "opto/runtime.hpp" | |
40 #include "opto/subnode.hpp" | |
41 #include "prims/nativeLookup.hpp" | |
42 #include "runtime/sharedRuntime.hpp" | |
0 | 43 |
44 #ifndef PRODUCT | |
45 void trace_type_profile(ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) { | |
46 if (TraceTypeProfile || PrintInlining || PrintOptoInlining) { | |
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47 if (!PrintInlining) { |
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48 if (!PrintOpto && !PrintCompilation) { |
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49 method->print_short_name(); |
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50 tty->cr(); |
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51 } |
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52 CompileTask::print_inlining(prof_method, depth, bci); |
0 | 53 } |
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54 CompileTask::print_inline_indent(depth); |
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55 tty->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count); |
0 | 56 prof_klass->name()->print_symbol(); |
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57 tty->cr(); |
0 | 58 } |
59 } | |
60 #endif | |
61 | |
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62 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual, |
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63 JVMState* jvms, bool allow_inline, |
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64 float prof_factor) { |
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65 CallGenerator* cg; |
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66 ciMethod* caller = jvms->method(); |
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67 int bci = jvms->bci(); |
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68 Bytecodes::Code bytecode = caller->java_code_at_bci(bci); |
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69 guarantee(call_method != NULL, "failed method resolution"); |
0 | 70 |
71 // Dtrace currently doesn't work unless all calls are vanilla | |
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72 if (env()->dtrace_method_probes()) { |
0 | 73 allow_inline = false; |
74 } | |
75 | |
76 // Note: When we get profiling during stage-1 compiles, we want to pull | |
77 // from more specific profile data which pertains to this inlining. | |
78 // Right now, ignore the information in jvms->caller(), and do method[bci]. | |
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79 ciCallProfile profile = caller->call_profile_at_bci(bci); |
0 | 80 |
81 // See how many times this site has been invoked. | |
82 int site_count = profile.count(); | |
83 int receiver_count = -1; | |
84 if (call_is_virtual && UseTypeProfile && profile.has_receiver(0)) { | |
85 // Receivers in the profile structure are ordered by call counts | |
86 // so that the most called (major) receiver is profile.receiver(0). | |
87 receiver_count = profile.receiver_count(0); | |
88 } | |
89 | |
90 CompileLog* log = this->log(); | |
91 if (log != NULL) { | |
92 int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1; | |
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93 int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1; |
0 | 94 log->begin_elem("call method='%d' count='%d' prof_factor='%g'", |
95 log->identify(call_method), site_count, prof_factor); | |
96 if (call_is_virtual) log->print(" virtual='1'"); | |
97 if (allow_inline) log->print(" inline='1'"); | |
98 if (receiver_count >= 0) { | |
99 log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count); | |
100 if (profile.has_receiver(1)) { | |
101 log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1)); | |
102 } | |
103 } | |
104 log->end_elem(); | |
105 } | |
106 | |
107 // Special case the handling of certain common, profitable library | |
108 // methods. If these methods are replaced with specialized code, | |
109 // then we return it as the inlined version of the call. | |
110 // We do this before the strict f.p. check below because the | |
111 // intrinsics handle strict f.p. correctly. | |
112 if (allow_inline) { | |
113 cg = find_intrinsic(call_method, call_is_virtual); | |
114 if (cg != NULL) return cg; | |
115 } | |
116 | |
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117 // Do MethodHandle calls. |
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118 // NOTE: This must happen before normal inlining logic below since |
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119 // MethodHandle.invoke* are native methods which obviously don't |
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120 // have bytecodes and so normal inlining fails. |
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121 if (call_method->is_method_handle_invoke()) { |
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122 if (bytecode != Bytecodes::_invokedynamic) { |
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123 GraphKit kit(jvms); |
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124 Node* n = kit.argument(0); |
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125 |
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126 if (n->Opcode() == Op_ConP) { |
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127 const TypeOopPtr* oop_ptr = n->bottom_type()->is_oopptr(); |
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128 ciObject* const_oop = oop_ptr->const_oop(); |
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129 ciMethodHandle* method_handle = const_oop->as_method_handle(); |
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130 |
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131 // Set the callee to have access to the class and signature in |
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132 // the MethodHandleCompiler. |
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133 method_handle->set_callee(call_method); |
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134 method_handle->set_caller(caller); |
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135 method_handle->set_call_profile(&profile); |
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136 |
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137 // Get an adapter for the MethodHandle. |
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138 ciMethod* target_method = method_handle->get_method_handle_adapter(); |
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139 if (target_method != NULL) { |
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140 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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141 if (hit_cg != NULL && hit_cg->is_inline()) |
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142 return hit_cg; |
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143 } |
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144 } |
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145 |
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146 return CallGenerator::for_direct_call(call_method); |
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147 } |
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148 else { |
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149 // Get the MethodHandle from the CallSite. |
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150 ciMethod* caller_method = jvms->method(); |
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151 ciBytecodeStream str(caller_method); |
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152 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci. |
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153 ciCallSite* call_site = str.get_call_site(); |
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154 ciMethodHandle* method_handle = call_site->get_target(); |
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155 |
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156 // Set the callee to have access to the class and signature in |
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157 // the MethodHandleCompiler. |
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158 method_handle->set_callee(call_method); |
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159 method_handle->set_caller(caller); |
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160 method_handle->set_call_profile(&profile); |
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161 |
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162 // Get an adapter for the MethodHandle. |
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163 ciMethod* target_method = method_handle->get_invokedynamic_adapter(); |
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164 if (target_method != NULL) { |
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165 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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166 if (hit_cg != NULL && hit_cg->is_inline()) { |
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167 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method); |
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168 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor); |
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169 } |
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170 } |
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171 |
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172 // If something failed, generate a normal dynamic call. |
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173 return CallGenerator::for_dynamic_call(call_method); |
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174 } |
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175 } |
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176 |
0 | 177 // Do not inline strict fp into non-strict code, or the reverse |
178 bool caller_method_is_strict = jvms->method()->is_strict(); | |
179 if( caller_method_is_strict ^ call_method->is_strict() ) { | |
180 allow_inline = false; | |
181 } | |
182 | |
183 // Attempt to inline... | |
184 if (allow_inline) { | |
185 // The profile data is only partly attributable to this caller, | |
186 // scale back the call site information. | |
187 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
188 // This is the number of times we expect the call code to be used. | |
189 float expected_uses = past_uses; | |
190 | |
191 // Try inlining a bytecoded method: | |
192 if (!call_is_virtual) { | |
193 InlineTree* ilt; | |
194 if (UseOldInlining) { | |
195 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
196 } else { | |
197 // Make a disembodied, stateless ILT. | |
198 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
199 float site_invoke_ratio = prof_factor; | |
200 // Note: ilt is for the root of this parse, not the present call site. | |
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201 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0); |
0 | 202 } |
203 WarmCallInfo scratch_ci; | |
204 if (!UseOldInlining) | |
205 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
206 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
207 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
208 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
209 bool require_inline = (allow_inline && ci->is_hot()); | |
210 | |
211 if (allow_inline) { | |
212 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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213 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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214 // Delay the inlining of this method to give us the |
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215 // opportunity to perform some high level optimizations |
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216 // first. |
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217 return CallGenerator::for_late_inline(call_method, cg); |
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218 } |
0 | 219 if (cg == NULL) { |
220 // Fall through. | |
221 } else if (require_inline || !InlineWarmCalls) { | |
222 return cg; | |
223 } else { | |
224 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
225 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
226 } | |
227 } | |
228 } | |
229 | |
230 // Try using the type profile. | |
231 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
232 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
233 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
234 ciMethod* receiver_method = NULL; | |
235 if (have_major_receiver || profile.morphism() == 1 || | |
236 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
237 // receiver_method = profile.method(); | |
238 // Profiles do not suggest methods now. Look it up in the major receiver. | |
239 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
240 profile.receiver(0)); | |
241 } | |
242 if (receiver_method != NULL) { | |
243 // The single majority receiver sufficiently outweighs the minority. | |
244 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
245 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
246 if (hit_cg != NULL) { | |
247 // Look up second receiver. | |
248 CallGenerator* next_hit_cg = NULL; | |
249 ciMethod* next_receiver_method = NULL; | |
250 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
251 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
252 profile.receiver(1)); | |
253 if (next_receiver_method != NULL) { | |
254 next_hit_cg = this->call_generator(next_receiver_method, | |
255 vtable_index, !call_is_virtual, jvms, | |
256 allow_inline, prof_factor); | |
257 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
258 have_major_receiver && UseOnlyInlinedBimorphic) { | |
259 // Skip if we can't inline second receiver's method | |
260 next_hit_cg = NULL; | |
261 } | |
262 } | |
263 } | |
264 CallGenerator* miss_cg; | |
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265 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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266 Deoptimization::Reason_bimorphic : |
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267 Deoptimization::Reason_class_check; |
0 | 268 if (( profile.morphism() == 1 || |
269 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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270 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 271 ) { |
272 // Generate uncommon trap for class check failure path | |
273 // in case of monomorphic or bimorphic virtual call site. | |
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274 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
0 | 275 Deoptimization::Action_maybe_recompile); |
276 } else { | |
277 // Generate virtual call for class check failure path | |
278 // in case of polymorphic virtual call site. | |
279 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
280 } | |
281 if (miss_cg != NULL) { | |
282 if (next_hit_cg != NULL) { | |
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283 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 | 284 // We don't need to record dependency on a receiver here and below. |
285 // Whenever we inline, the dependency is added by Parse::Parse(). | |
286 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
287 } | |
288 if (miss_cg != NULL) { | |
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289 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
0 | 290 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
291 if (cg != NULL) return cg; | |
292 } | |
293 } | |
294 } | |
295 } | |
296 } | |
297 } | |
298 | |
299 // There was no special inlining tactic, or it bailed out. | |
300 // Use a more generic tactic, like a simple call. | |
301 if (call_is_virtual) { | |
302 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
303 } else { | |
304 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
305 // or it is a static or special call. | |
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306 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
0 | 307 } |
308 } | |
309 | |
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310 // Return true for methods that shouldn't be inlined early so that |
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311 // they are easier to analyze and optimize as intrinsics. |
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312 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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313 if (has_stringbuilder()) { |
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314 |
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315 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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316 call_method->holder() == C->env()->StringBuffer_klass()) && |
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317 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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318 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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319 // Delay SB calls only when called from non-SB code |
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320 return false; |
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321 } |
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322 |
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323 switch (call_method->intrinsic_id()) { |
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324 case vmIntrinsics::_StringBuilder_void: |
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325 case vmIntrinsics::_StringBuilder_int: |
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326 case vmIntrinsics::_StringBuilder_String: |
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327 case vmIntrinsics::_StringBuilder_append_char: |
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328 case vmIntrinsics::_StringBuilder_append_int: |
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329 case vmIntrinsics::_StringBuilder_append_String: |
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330 case vmIntrinsics::_StringBuilder_toString: |
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331 case vmIntrinsics::_StringBuffer_void: |
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332 case vmIntrinsics::_StringBuffer_int: |
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333 case vmIntrinsics::_StringBuffer_String: |
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334 case vmIntrinsics::_StringBuffer_append_char: |
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335 case vmIntrinsics::_StringBuffer_append_int: |
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336 case vmIntrinsics::_StringBuffer_append_String: |
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337 case vmIntrinsics::_StringBuffer_toString: |
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338 case vmIntrinsics::_Integer_toString: |
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339 return true; |
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340 |
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341 case vmIntrinsics::_String_String: |
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342 { |
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343 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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344 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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345 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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346 ciMethod* m = csj->method(); |
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347 if (m != NULL && |
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348 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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349 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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350 // Delay String.<init>(new SB()) |
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351 return true; |
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352 } |
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353 return false; |
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354 } |
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355 |
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356 default: |
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357 return false; |
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358 } |
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359 } |
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360 return false; |
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361 } |
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362 |
0 | 363 |
364 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
365 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
366 // Additional inputs to consider... | |
367 // bc = bc() | |
368 // caller = method() | |
369 // iter().get_method_holder_index() | |
370 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
371 // Interface classes can be loaded & linked and never get around to | |
372 // being initialized. Uncommon-trap for not-initialized static or | |
373 // v-calls. Let interface calls happen. | |
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374 ciInstanceKlass* holder_klass = dest_method->holder(); |
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375 if (!holder_klass->is_being_initialized() && |
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376 !holder_klass->is_initialized() && |
0 | 377 !holder_klass->is_interface()) { |
378 uncommon_trap(Deoptimization::Reason_uninitialized, | |
379 Deoptimization::Action_reinterpret, | |
380 holder_klass); | |
381 return true; | |
382 } | |
383 | |
384 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
385 return false; | |
386 } | |
387 | |
388 | |
389 //------------------------------do_call---------------------------------------- | |
390 // Handle your basic call. Inline if we can & want to, else just setup call. | |
391 void Parse::do_call() { | |
392 // It's likely we are going to add debug info soon. | |
393 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
394 // our contribution to it is cleaned up right here. | |
395 kill_dead_locals(); | |
396 | |
397 // Set frequently used booleans | |
398 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
399 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
400 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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401 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
0 | 402 |
403 // Find target being called | |
404 bool will_link; | |
405 ciMethod* dest_method = iter().get_method(will_link); | |
406 ciInstanceKlass* holder_klass = dest_method->holder(); | |
407 ciKlass* holder = iter().get_declared_method_holder(); | |
408 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
409 | |
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410 int nargs = dest_method->arg_size(); |
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411 if (is_invokedynamic) nargs -= 1; |
0 | 412 |
413 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
414 // bailout when too many arguments for register representation | |
415 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
416 #ifndef PRODUCT | |
417 if (PrintOpto && (Verbose || WizardMode)) { | |
418 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
419 dest_method->print_name(); tty->cr(); | |
420 } | |
421 #endif | |
422 return; | |
423 } | |
424 assert(holder_klass->is_loaded(), ""); | |
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425 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
0 | 426 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
427 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
428 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
429 // Note: In the absence of miranda methods, an abstract class K can perform | |
430 // an invokevirtual directly on an interface method I.m if K implements I. | |
431 | |
432 // --------------------- | |
433 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
434 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
435 // Does the call-site type profile reveal only one receiver? | |
436 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
437 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
438 | |
439 // Choose call strategy. | |
440 bool call_is_virtual = is_virtual_or_interface; | |
441 int vtable_index = methodOopDesc::invalid_vtable_index; | |
442 ciMethod* call_method = dest_method; | |
443 | |
444 // Try to get the most accurate receiver type | |
445 if (is_virtual_or_interface) { | |
446 Node* receiver_node = stack(sp() - nargs); | |
447 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
448 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
449 | |
450 // Have the call been sufficiently improved such that it is no longer a virtual? | |
451 if (optimized_virtual_method != NULL) { | |
452 call_method = optimized_virtual_method; | |
453 call_is_virtual = false; | |
454 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
455 // We can make a vtable call at this site | |
456 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
457 } | |
458 } | |
459 | |
460 // Note: It's OK to try to inline a virtual call. | |
461 // The call generator will not attempt to inline a polymorphic call | |
462 // unless it knows how to optimize the receiver dispatch. | |
463 bool try_inline = (C->do_inlining() || InlineAccessors); | |
464 | |
465 // --------------------- | |
466 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
467 JVMState* jvms = sync_jvms(); | |
468 | |
469 // --------------------- | |
470 // Decide call tactic. | |
471 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
472 // It decides whether inlining is desirable or not. | |
473 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
474 | |
475 // --------------------- | |
476 // Round double arguments before call | |
477 round_double_arguments(dest_method); | |
478 | |
479 #ifndef PRODUCT | |
480 // bump global counters for calls | |
481 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
482 | |
483 // Record first part of parsing work for this call | |
484 parse_histogram()->record_change(); | |
485 #endif // not PRODUCT | |
486 | |
487 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
488 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
489 | |
490 // save across call, for a subsequent cast_not_null. | |
491 Node* receiver = has_receiver ? argument(0) : NULL; | |
492 | |
493 // Bump method data counters (We profile *before* the call is made | |
494 // because exceptions don't return to the call site.) | |
495 profile_call(receiver); | |
496 | |
497 JVMState* new_jvms; | |
498 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
499 // When inlining attempt fails (e.g., too many arguments), | |
500 // it may contaminate the current compile state, making it | |
501 // impossible to pull back and try again. Once we call | |
502 // cg->generate(), we are committed. If it fails, the whole | |
503 // compilation task is compromised. | |
504 if (failing()) return; | |
505 #ifndef PRODUCT | |
506 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
507 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
508 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
509 tty->print("Bailed out of intrinsic, will not inline: "); | |
510 call_method->print_name(); tty->cr(); | |
511 } | |
512 } | |
513 #endif | |
514 // This can happen if a library intrinsic is available, but refuses | |
515 // the call site, perhaps because it did not match a pattern the | |
516 // intrinsic was expecting to optimize. The fallback position is | |
517 // to call out-of-line. | |
518 try_inline = false; // Inline tactic bailed out. | |
519 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
520 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
521 guarantee(failing(), "call failed to generate: calls should work"); | |
522 return; | |
523 } | |
524 } | |
525 | |
526 if (cg->is_inline()) { | |
67 | 527 // Accumulate has_loops estimate |
528 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
0 | 529 C->env()->notice_inlined_method(call_method); |
530 } | |
531 | |
532 // Reset parser state from [new_]jvms, which now carries results of the call. | |
533 // Return value (if any) is already pushed on the stack by the cg. | |
534 add_exception_states_from(new_jvms); | |
535 if (new_jvms->map()->control() == top()) { | |
536 stop_and_kill_map(); | |
537 } else { | |
538 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
539 set_jvms(new_jvms); | |
540 } | |
541 | |
542 if (!stopped()) { | |
543 // This was some sort of virtual call, which did a null check for us. | |
544 // Now we can assert receiver-not-null, on the normal return path. | |
545 if (receiver != NULL && cg->is_virtual()) { | |
546 Node* cast = cast_not_null(receiver); | |
547 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
548 } | |
549 | |
550 // Round double result after a call from strict to non-strict code | |
551 round_double_result(dest_method); | |
552 | |
553 // If the return type of the method is not loaded, assert that the | |
554 // value we got is a null. Otherwise, we need to recompile. | |
555 if (!dest_method->return_type()->is_loaded()) { | |
556 #ifndef PRODUCT | |
557 if (PrintOpto && (Verbose || WizardMode)) { | |
558 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
559 dest_method->print_name(); tty->cr(); | |
560 } | |
561 #endif | |
562 if (C->log() != NULL) { | |
563 C->log()->elem("assert_null reason='return' klass='%d'", | |
564 C->log()->identify(dest_method->return_type())); | |
565 } | |
566 // If there is going to be a trap, put it at the next bytecode: | |
567 set_bci(iter().next_bci()); | |
568 do_null_assert(peek(), T_OBJECT); | |
569 set_bci(iter().cur_bci()); // put it back | |
570 } | |
571 } | |
572 | |
573 // Restart record of parsing work after possible inlining of call | |
574 #ifndef PRODUCT | |
575 parse_histogram()->set_initial_state(bc()); | |
576 #endif | |
577 } | |
578 | |
579 //---------------------------catch_call_exceptions----------------------------- | |
580 // Put a Catch and CatchProj nodes behind a just-created call. | |
581 // Send their caught exceptions to the proper handler. | |
582 // This may be used after a call to the rethrow VM stub, | |
583 // when it is needed to process unloaded exception classes. | |
584 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
585 // Exceptions are delivered through this channel: | |
586 Node* i_o = this->i_o(); | |
587 | |
588 // Add a CatchNode. | |
589 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
590 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
591 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
592 | |
593 for (; !handlers.is_done(); handlers.next()) { | |
594 ciExceptionHandler* h = handlers.handler(); | |
595 int h_bci = h->handler_bci(); | |
596 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
597 // Do not introduce unloaded exception types into the graph: | |
598 if (!h_klass->is_loaded()) { | |
599 if (saw_unloaded->contains(h_bci)) { | |
600 /* We've already seen an unloaded exception with h_bci, | |
601 so don't duplicate. Duplication will cause the CatchNode to be | |
602 unnecessarily large. See 4713716. */ | |
603 continue; | |
604 } else { | |
605 saw_unloaded->append(h_bci); | |
606 } | |
607 } | |
608 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
609 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
610 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
611 assert(!h_extype->empty(), "sanity"); | |
612 // Note: It's OK if the BCIs repeat themselves. | |
613 bcis->append(h_bci); | |
614 extypes->append(h_extype); | |
615 } | |
616 | |
617 int len = bcis->length(); | |
618 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
619 Node *catch_ = _gvn.transform(cn); | |
620 | |
621 // now branch with the exception state to each of the (potential) | |
622 // handlers | |
623 for(int i=0; i < len; i++) { | |
624 // Setup JVM state to enter the handler. | |
625 PreserveJVMState pjvms(this); | |
626 // Locals are just copied from before the call. | |
627 // Get control from the CatchNode. | |
628 int handler_bci = bcis->at(i); | |
629 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
630 // This handler cannot happen? | |
631 if (ctrl == top()) continue; | |
632 set_control(ctrl); | |
633 | |
634 // Create exception oop | |
635 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
636 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
637 | |
638 // Handle unloaded exception classes. | |
639 if (saw_unloaded->contains(handler_bci)) { | |
640 // An unloaded exception type is coming here. Do an uncommon trap. | |
641 #ifndef PRODUCT | |
642 // We do not expect the same handler bci to take both cold unloaded | |
643 // and hot loaded exceptions. But, watch for it. | |
644 if (extype->is_loaded()) { | |
645 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
646 method()->print_name(); tty->cr(); | |
647 } else if (PrintOpto && (Verbose || WizardMode)) { | |
648 tty->print("Bailing out on unloaded exception type "); | |
649 extype->klass()->print_name(); | |
650 tty->print(" at bci:%d in ", bci()); | |
651 method()->print_name(); tty->cr(); | |
652 } | |
653 #endif | |
654 // Emit an uncommon trap instead of processing the block. | |
655 set_bci(handler_bci); | |
656 push_ex_oop(ex_oop); | |
657 uncommon_trap(Deoptimization::Reason_unloaded, | |
658 Deoptimization::Action_reinterpret, | |
659 extype->klass(), "!loaded exception"); | |
660 set_bci(iter().cur_bci()); // put it back | |
661 continue; | |
662 } | |
663 | |
664 // go to the exception handler | |
665 if (handler_bci < 0) { // merge with corresponding rethrow node | |
666 throw_to_exit(make_exception_state(ex_oop)); | |
667 } else { // Else jump to corresponding handle | |
668 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
669 merge_exception(handler_bci); | |
670 } | |
671 } | |
672 | |
673 // The first CatchProj is for the normal return. | |
674 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
675 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
676 } | |
677 | |
678 | |
679 //----------------------------catch_inline_exceptions-------------------------- | |
680 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
681 // Common case 1: we have no handler, so all exceptions merge right into | |
682 // the rethrow case. | |
683 // Case 2: we have some handlers, with loaded exception klasses that have | |
684 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
685 // exception oop and branch to the handler directly. | |
686 // Case 3: We have some handlers with subklasses or are not loaded at | |
687 // compile-time. We have to call the runtime to resolve the exception. | |
688 // So we insert a RethrowCall and all the logic that goes with it. | |
689 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
690 // Caller is responsible for saving away the map for normal control flow! | |
691 assert(stopped(), "call set_map(NULL) first"); | |
692 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
693 | |
694 Node* ex_node = saved_ex_oop(ex_map); | |
695 if (ex_node == top()) { | |
696 // No action needed. | |
697 return; | |
698 } | |
699 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
700 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
701 if (ex_type == NULL) | |
702 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
703 | |
704 // determine potential exception handlers | |
705 ciExceptionHandlerStream handlers(method(), bci(), | |
706 ex_type->klass()->as_instance_klass(), | |
707 ex_type->klass_is_exact()); | |
708 | |
709 // Start executing from the given throw state. (Keep its stack, for now.) | |
710 // Get the exception oop as known at compile time. | |
711 ex_node = use_exception_state(ex_map); | |
712 | |
713 // Get the exception oop klass from its header | |
714 Node* ex_klass_node = NULL; | |
715 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
716 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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717 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 718 |
719 // Compute the exception klass a little more cleverly. | |
720 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
721 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
722 // each arm of the Phi. If I know something clever about the exceptions | |
723 // I'm loading the class from, I can replace the LoadKlass with the | |
724 // klass constant for the exception oop. | |
725 if( ex_node->is_Phi() ) { | |
726 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
727 for( uint i = 1; i < ex_node->req(); i++ ) { | |
728 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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729 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 730 ex_klass_node->init_req( i, k ); |
731 } | |
732 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
733 | |
734 } | |
735 } | |
736 | |
737 // Scan the exception table for applicable handlers. | |
738 // If none, we can call rethrow() and be done! | |
739 // If precise (loaded with no subklasses), insert a D.S. style | |
740 // pointer compare to the correct handler and loop back. | |
741 // If imprecise, switch to the Rethrow VM-call style handling. | |
742 | |
743 int remaining = handlers.count_remaining(); | |
744 | |
745 // iterate through all entries sequentially | |
746 for (;!handlers.is_done(); handlers.next()) { | |
747 ciExceptionHandler* handler = handlers.handler(); | |
748 | |
749 if (handler->is_rethrow()) { | |
750 // If we fell off the end of the table without finding an imprecise | |
751 // exception klass (and without finding a generic handler) then we | |
752 // know this exception is not handled in this method. We just rethrow | |
753 // the exception into the caller. | |
754 throw_to_exit(make_exception_state(ex_node)); | |
755 return; | |
756 } | |
757 | |
758 // exception handler bci range covers throw_bci => investigate further | |
759 int handler_bci = handler->handler_bci(); | |
760 | |
761 if (remaining == 1) { | |
762 push_ex_oop(ex_node); // Push exception oop for handler | |
763 #ifndef PRODUCT | |
764 if (PrintOpto && WizardMode) { | |
765 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
766 } | |
767 #endif | |
768 merge_exception(handler_bci); // jump to handler | |
769 return; // No more handling to be done here! | |
770 } | |
771 | |
1344 | 772 // Get the handler's klass |
0 | 773 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 774 |
775 if (!klass->is_loaded()) { // klass is not loaded? | |
776 // fall through into catch_call_exceptions which will emit a | |
777 // handler with an uncommon trap. | |
778 break; | |
0 | 779 } |
780 | |
781 if (klass->is_interface()) // should not happen, but... | |
782 break; // bail out | |
783 | |
1344 | 784 // Check the type of the exception against the catch type |
0 | 785 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
786 Node* con = _gvn.makecon(tk); | |
1344 | 787 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
788 if (!stopped()) { | |
789 PreserveJVMState pjvms(this); | |
790 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
791 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
0 | 792 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
793 push_ex_oop(ex_oop); // Push exception oop for handler | |
794 #ifndef PRODUCT | |
795 if (PrintOpto && WizardMode) { | |
796 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
797 klass->print_name(); | |
798 tty->cr(); | |
799 } | |
800 #endif | |
801 merge_exception(handler_bci); | |
802 } | |
1344 | 803 set_control(not_subtype_ctrl); |
0 | 804 |
805 // Come here if exception does not match handler. | |
806 // Carry on with more handler checks. | |
807 --remaining; | |
808 } | |
809 | |
810 assert(!stopped(), "you should return if you finish the chain"); | |
811 | |
812 // Oops, need to call into the VM to resolve the klasses at runtime. | |
813 // Note: This call must not deoptimize, since it is not a real at this bci! | |
814 kill_dead_locals(); | |
815 | |
816 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
817 OptoRuntime::rethrow_Type(), | |
818 OptoRuntime::rethrow_stub(), | |
819 NULL, NULL, | |
820 ex_node); | |
821 | |
822 // Rethrow is a pure call, no side effects, only a result. | |
823 // The result cannot be allocated, so we use I_O | |
824 | |
825 // Catch exceptions from the rethrow | |
826 catch_call_exceptions(handlers); | |
827 } | |
828 | |
829 | |
830 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
831 | |
832 | |
833 #ifndef PRODUCT | |
834 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
835 if( CountCompiledCalls ) { | |
836 if( at_method_entry ) { | |
837 // bump invocation counter if top method (for statistics) | |
838 if (CountCompiledCalls && depth() == 1) { | |
839 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
840 Node* adr1 = makecon(addr_type); | |
841 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
842 increment_counter(adr2); | |
843 } | |
844 } else if (is_inline) { | |
845 switch (bc()) { | |
846 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
847 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
848 case Bytecodes::_invokestatic: | |
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849 case Bytecodes::_invokedynamic: |
0 | 850 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
851 default: fatal("unexpected call bytecode"); | |
852 } | |
853 } else { | |
854 switch (bc()) { | |
855 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
856 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
857 case Bytecodes::_invokestatic: | |
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858 case Bytecodes::_invokedynamic: |
0 | 859 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
860 default: fatal("unexpected call bytecode"); | |
861 } | |
862 } | |
863 } | |
864 } | |
865 #endif //PRODUCT | |
866 | |
867 | |
868 // Identify possible target method and inlining style | |
869 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
870 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
871 // only use for virtual or interface calls | |
872 | |
873 // If it is obviously final, do not bother to call find_monomorphic_target, | |
874 // because the class hierarchy checks are not needed, and may fail due to | |
875 // incompletely loaded classes. Since we do our own class loading checks | |
876 // in this module, we may confidently bind to any method. | |
877 if (dest_method->can_be_statically_bound()) { | |
878 return dest_method; | |
879 } | |
880 | |
881 // Attempt to improve the receiver | |
882 bool actual_receiver_is_exact = false; | |
883 ciInstanceKlass* actual_receiver = klass; | |
884 if (receiver_type != NULL) { | |
885 // Array methods are all inherited from Object, and are monomorphic. | |
886 if (receiver_type->isa_aryptr() && | |
887 dest_method->holder() == env()->Object_klass()) { | |
888 return dest_method; | |
889 } | |
890 | |
891 // All other interesting cases are instance klasses. | |
892 if (!receiver_type->isa_instptr()) { | |
893 return NULL; | |
894 } | |
895 | |
896 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
897 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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898 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 899 // ikl is a same or better type than the original actual_receiver, |
900 // e.g. static receiver from bytecodes. | |
901 actual_receiver = ikl; | |
902 // Is the actual_receiver exact? | |
903 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
904 } | |
905 } | |
906 | |
907 ciInstanceKlass* calling_klass = caller->holder(); | |
908 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
909 if (cha_monomorphic_target != NULL) { | |
910 assert(!cha_monomorphic_target->is_abstract(), ""); | |
911 // Look at the method-receiver type. Does it add "too much information"? | |
912 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
913 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
914 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
915 // Calling this method would include an implicit cast to its holder. | |
916 // %%% Not yet implemented. Would throw minor asserts at present. | |
917 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
918 // To fix, put the higher_equal check at the call of this routine, | |
919 // and add a CheckCastPP to the receiver. | |
920 if (TraceDependencies) { | |
921 tty->print_cr("found unique CHA method, but could not cast up"); | |
922 tty->print(" method = "); | |
923 cha_monomorphic_target->print(); | |
924 tty->cr(); | |
925 } | |
926 if (C->log() != NULL) { | |
927 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
928 C->log()->identify(klass), | |
929 C->log()->identify(cha_monomorphic_target)); | |
930 } | |
931 cha_monomorphic_target = NULL; | |
932 } | |
933 } | |
934 if (cha_monomorphic_target != NULL) { | |
935 // Hardwiring a virtual. | |
936 // If we inlined because CHA revealed only a single target method, | |
937 // then we are dependent on that target method not getting overridden | |
938 // by dynamic class loading. Be sure to test the "static" receiver | |
939 // dest_method here, as opposed to the actual receiver, which may | |
940 // falsely lead us to believe that the receiver is final or private. | |
941 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
942 return cha_monomorphic_target; | |
943 } | |
944 | |
945 // If the type is exact, we can still bind the method w/o a vcall. | |
946 // (This case comes after CHA so we can see how much extra work it does.) | |
947 if (actual_receiver_is_exact) { | |
948 // In case of evolution, there is a dependence on every inlined method, since each | |
949 // such method can be changed when its class is redefined. | |
950 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
951 if (exact_method != NULL) { | |
952 #ifndef PRODUCT | |
953 if (PrintOpto) { | |
954 tty->print(" Calling method via exact type @%d --- ", bci); | |
955 exact_method->print_name(); | |
956 tty->cr(); | |
957 } | |
958 #endif | |
959 return exact_method; | |
960 } | |
961 } | |
962 | |
963 return NULL; | |
964 } |