Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/doCall.cpp @ 3441:f56542cb325a
7050554: JSR 292 - need optimization for selectAlternative
Reviewed-by: kvn, jrose
author | never |
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date | Thu, 02 Jun 2011 13:36:11 -0700 |
parents | fabcf26ee72f |
children | 393e144bb99b |
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 CallGenerator* cg = CallGenerator::for_method_handle_inline(n, jvms, caller, call_method, profile); |
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127 if (cg != NULL) { |
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128 return cg; |
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129 } |
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130 |
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131 return CallGenerator::for_direct_call(call_method); |
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132 } |
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133 else { |
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134 // Get the MethodHandle from the CallSite. |
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135 ciMethod* caller_method = jvms->method(); |
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136 ciBytecodeStream str(caller_method); |
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137 str.force_bci(jvms->bci()); // Set the stream to the invokedynamic bci. |
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138 ciCallSite* call_site = str.get_call_site(); |
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139 ciMethodHandle* method_handle = call_site->get_target(); |
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140 |
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141 // Set the callee to have access to the class and signature in |
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142 // the MethodHandleCompiler. |
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143 method_handle->set_callee(call_method); |
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144 method_handle->set_caller(caller); |
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145 method_handle->set_call_profile(profile); |
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146 |
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147 // Get an adapter for the MethodHandle. |
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148 ciMethod* target_method = method_handle->get_invokedynamic_adapter(); |
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149 if (target_method != NULL) { |
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150 CallGenerator* hit_cg = this->call_generator(target_method, vtable_index, false, jvms, true, prof_factor); |
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151 if (hit_cg != NULL && hit_cg->is_inline()) { |
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152 CallGenerator* miss_cg = CallGenerator::for_dynamic_call(call_method); |
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153 return CallGenerator::for_predicted_dynamic_call(method_handle, miss_cg, hit_cg, prof_factor); |
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154 } |
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155 } |
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156 |
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157 // If something failed, generate a normal dynamic call. |
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158 return CallGenerator::for_dynamic_call(call_method); |
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159 } |
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160 } |
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161 |
0 | 162 // Do not inline strict fp into non-strict code, or the reverse |
163 bool caller_method_is_strict = jvms->method()->is_strict(); | |
164 if( caller_method_is_strict ^ call_method->is_strict() ) { | |
165 allow_inline = false; | |
166 } | |
167 | |
168 // Attempt to inline... | |
169 if (allow_inline) { | |
170 // The profile data is only partly attributable to this caller, | |
171 // scale back the call site information. | |
172 float past_uses = jvms->method()->scale_count(site_count, prof_factor); | |
173 // This is the number of times we expect the call code to be used. | |
174 float expected_uses = past_uses; | |
175 | |
176 // Try inlining a bytecoded method: | |
177 if (!call_is_virtual) { | |
178 InlineTree* ilt; | |
179 if (UseOldInlining) { | |
180 ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method()); | |
181 } else { | |
182 // Make a disembodied, stateless ILT. | |
183 // TO DO: When UseOldInlining is removed, copy the ILT code elsewhere. | |
184 float site_invoke_ratio = prof_factor; | |
185 // Note: ilt is for the root of this parse, not the present call site. | |
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186 ilt = new InlineTree(this, jvms->method(), jvms->caller(), site_invoke_ratio, 0); |
0 | 187 } |
188 WarmCallInfo scratch_ci; | |
189 if (!UseOldInlining) | |
190 scratch_ci.init(jvms, call_method, profile, prof_factor); | |
191 WarmCallInfo* ci = ilt->ok_to_inline(call_method, jvms, profile, &scratch_ci); | |
192 assert(ci != &scratch_ci, "do not let this pointer escape"); | |
193 bool allow_inline = (ci != NULL && !ci->is_cold()); | |
194 bool require_inline = (allow_inline && ci->is_hot()); | |
195 | |
196 if (allow_inline) { | |
197 CallGenerator* cg = CallGenerator::for_inline(call_method, expected_uses); | |
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198 if (require_inline && cg != NULL && should_delay_inlining(call_method, jvms)) { |
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199 // Delay the inlining of this method to give us the |
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200 // opportunity to perform some high level optimizations |
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201 // first. |
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202 return CallGenerator::for_late_inline(call_method, cg); |
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203 } |
0 | 204 if (cg == NULL) { |
205 // Fall through. | |
206 } else if (require_inline || !InlineWarmCalls) { | |
207 return cg; | |
208 } else { | |
209 CallGenerator* cold_cg = call_generator(call_method, vtable_index, call_is_virtual, jvms, false, prof_factor); | |
210 return CallGenerator::for_warm_call(ci, cold_cg, cg); | |
211 } | |
212 } | |
213 } | |
214 | |
215 // Try using the type profile. | |
216 if (call_is_virtual && site_count > 0 && receiver_count > 0) { | |
217 // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count. | |
218 bool have_major_receiver = (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent); | |
219 ciMethod* receiver_method = NULL; | |
220 if (have_major_receiver || profile.morphism() == 1 || | |
221 (profile.morphism() == 2 && UseBimorphicInlining)) { | |
222 // receiver_method = profile.method(); | |
223 // Profiles do not suggest methods now. Look it up in the major receiver. | |
224 receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
225 profile.receiver(0)); | |
226 } | |
227 if (receiver_method != NULL) { | |
228 // The single majority receiver sufficiently outweighs the minority. | |
229 CallGenerator* hit_cg = this->call_generator(receiver_method, | |
230 vtable_index, !call_is_virtual, jvms, allow_inline, prof_factor); | |
231 if (hit_cg != NULL) { | |
232 // Look up second receiver. | |
233 CallGenerator* next_hit_cg = NULL; | |
234 ciMethod* next_receiver_method = NULL; | |
235 if (profile.morphism() == 2 && UseBimorphicInlining) { | |
236 next_receiver_method = call_method->resolve_invoke(jvms->method()->holder(), | |
237 profile.receiver(1)); | |
238 if (next_receiver_method != NULL) { | |
239 next_hit_cg = this->call_generator(next_receiver_method, | |
240 vtable_index, !call_is_virtual, jvms, | |
241 allow_inline, prof_factor); | |
242 if (next_hit_cg != NULL && !next_hit_cg->is_inline() && | |
243 have_major_receiver && UseOnlyInlinedBimorphic) { | |
244 // Skip if we can't inline second receiver's method | |
245 next_hit_cg = NULL; | |
246 } | |
247 } | |
248 } | |
249 CallGenerator* miss_cg; | |
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250 Deoptimization::DeoptReason reason = (profile.morphism() == 2) ? |
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251 Deoptimization::Reason_bimorphic : |
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252 Deoptimization::Reason_class_check; |
0 | 253 if (( profile.morphism() == 1 || |
254 (profile.morphism() == 2 && next_hit_cg != NULL) ) && | |
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255 !too_many_traps(jvms->method(), jvms->bci(), reason) |
0 | 256 ) { |
257 // Generate uncommon trap for class check failure path | |
258 // in case of monomorphic or bimorphic virtual call site. | |
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259 miss_cg = CallGenerator::for_uncommon_trap(call_method, reason, |
0 | 260 Deoptimization::Action_maybe_recompile); |
261 } else { | |
262 // Generate virtual call for class check failure path | |
263 // in case of polymorphic virtual call site. | |
264 miss_cg = CallGenerator::for_virtual_call(call_method, vtable_index); | |
265 } | |
266 if (miss_cg != NULL) { | |
267 if (next_hit_cg != NULL) { | |
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268 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 | 269 // We don't need to record dependency on a receiver here and below. |
270 // Whenever we inline, the dependency is added by Parse::Parse(). | |
271 miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX); | |
272 } | |
273 if (miss_cg != NULL) { | |
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274 NOT_PRODUCT(trace_type_profile(jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, profile.receiver(0), site_count, receiver_count)); |
0 | 275 cg = CallGenerator::for_predicted_call(profile.receiver(0), miss_cg, hit_cg, profile.receiver_prob(0)); |
276 if (cg != NULL) return cg; | |
277 } | |
278 } | |
279 } | |
280 } | |
281 } | |
282 } | |
283 | |
284 // There was no special inlining tactic, or it bailed out. | |
285 // Use a more generic tactic, like a simple call. | |
286 if (call_is_virtual) { | |
287 return CallGenerator::for_virtual_call(call_method, vtable_index); | |
288 } else { | |
289 // Class Hierarchy Analysis or Type Profile reveals a unique target, | |
290 // or it is a static or special call. | |
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291 return CallGenerator::for_direct_call(call_method, should_delay_inlining(call_method, jvms)); |
0 | 292 } |
293 } | |
294 | |
1080
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295 // Return true for methods that shouldn't be inlined early so that |
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296 // they are easier to analyze and optimize as intrinsics. |
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297 bool Compile::should_delay_inlining(ciMethod* call_method, JVMState* jvms) { |
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298 if (has_stringbuilder()) { |
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299 |
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300 if ((call_method->holder() == C->env()->StringBuilder_klass() || |
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301 call_method->holder() == C->env()->StringBuffer_klass()) && |
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302 (jvms->method()->holder() == C->env()->StringBuilder_klass() || |
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303 jvms->method()->holder() == C->env()->StringBuffer_klass())) { |
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304 // Delay SB calls only when called from non-SB code |
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305 return false; |
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306 } |
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307 |
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308 switch (call_method->intrinsic_id()) { |
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309 case vmIntrinsics::_StringBuilder_void: |
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310 case vmIntrinsics::_StringBuilder_int: |
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311 case vmIntrinsics::_StringBuilder_String: |
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312 case vmIntrinsics::_StringBuilder_append_char: |
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313 case vmIntrinsics::_StringBuilder_append_int: |
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314 case vmIntrinsics::_StringBuilder_append_String: |
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315 case vmIntrinsics::_StringBuilder_toString: |
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316 case vmIntrinsics::_StringBuffer_void: |
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317 case vmIntrinsics::_StringBuffer_int: |
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318 case vmIntrinsics::_StringBuffer_String: |
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319 case vmIntrinsics::_StringBuffer_append_char: |
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320 case vmIntrinsics::_StringBuffer_append_int: |
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321 case vmIntrinsics::_StringBuffer_append_String: |
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322 case vmIntrinsics::_StringBuffer_toString: |
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323 case vmIntrinsics::_Integer_toString: |
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324 return true; |
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325 |
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326 case vmIntrinsics::_String_String: |
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327 { |
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328 Node* receiver = jvms->map()->in(jvms->argoff() + 1); |
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329 if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) { |
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330 CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava(); |
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331 ciMethod* m = csj->method(); |
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332 if (m != NULL && |
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333 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString || |
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334 m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString)) |
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335 // Delay String.<init>(new SB()) |
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336 return true; |
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337 } |
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338 return false; |
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339 } |
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340 |
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341 default: |
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342 return false; |
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343 } |
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344 } |
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345 return false; |
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346 } |
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347 |
0 | 348 |
349 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link | |
350 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) { | |
351 // Additional inputs to consider... | |
352 // bc = bc() | |
353 // caller = method() | |
354 // iter().get_method_holder_index() | |
355 assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" ); | |
356 // Interface classes can be loaded & linked and never get around to | |
357 // being initialized. Uncommon-trap for not-initialized static or | |
358 // v-calls. Let interface calls happen. | |
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359 ciInstanceKlass* holder_klass = dest_method->holder(); |
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360 if (!holder_klass->is_being_initialized() && |
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361 !holder_klass->is_initialized() && |
0 | 362 !holder_klass->is_interface()) { |
363 uncommon_trap(Deoptimization::Reason_uninitialized, | |
364 Deoptimization::Action_reinterpret, | |
365 holder_klass); | |
366 return true; | |
367 } | |
368 | |
369 assert(dest_method->will_link(method()->holder(), klass, bc()), "dest_method: typeflow responsibility"); | |
370 return false; | |
371 } | |
372 | |
373 | |
374 //------------------------------do_call---------------------------------------- | |
375 // Handle your basic call. Inline if we can & want to, else just setup call. | |
376 void Parse::do_call() { | |
377 // It's likely we are going to add debug info soon. | |
378 // Also, if we inline a guy who eventually needs debug info for this JVMS, | |
379 // our contribution to it is cleaned up right here. | |
380 kill_dead_locals(); | |
381 | |
382 // Set frequently used booleans | |
383 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
384 bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface; | |
385 bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial; | |
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386 bool is_invokedynamic = bc() == Bytecodes::_invokedynamic; |
0 | 387 |
388 // Find target being called | |
389 bool will_link; | |
390 ciMethod* dest_method = iter().get_method(will_link); | |
391 ciInstanceKlass* holder_klass = dest_method->holder(); | |
392 ciKlass* holder = iter().get_declared_method_holder(); | |
393 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
394 | |
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395 int nargs = dest_method->arg_size(); |
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396 if (is_invokedynamic) nargs -= 1; |
0 | 397 |
398 // uncommon-trap when callee is unloaded, uninitialized or will not link | |
399 // bailout when too many arguments for register representation | |
400 if (!will_link || can_not_compile_call_site(dest_method, klass)) { | |
401 #ifndef PRODUCT | |
402 if (PrintOpto && (Verbose || WizardMode)) { | |
403 method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci()); | |
404 dest_method->print_name(); tty->cr(); | |
405 } | |
406 #endif | |
407 return; | |
408 } | |
409 assert(holder_klass->is_loaded(), ""); | |
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410 assert((dest_method->is_static() || is_invokedynamic) == !has_receiver , "must match bc"); |
0 | 411 // Note: this takes into account invokeinterface of methods declared in java/lang/Object, |
412 // which should be invokevirtuals but according to the VM spec may be invokeinterfaces | |
413 assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc"); | |
414 // Note: In the absence of miranda methods, an abstract class K can perform | |
415 // an invokevirtual directly on an interface method I.m if K implements I. | |
416 | |
417 // --------------------- | |
418 // Does Class Hierarchy Analysis reveal only a single target of a v-call? | |
419 // Then we may inline or make a static call, but become dependent on there being only 1 target. | |
420 // Does the call-site type profile reveal only one receiver? | |
421 // Then we may introduce a run-time check and inline on the path where it succeeds. | |
422 // The other path may uncommon_trap, check for another receiver, or do a v-call. | |
423 | |
424 // Choose call strategy. | |
425 bool call_is_virtual = is_virtual_or_interface; | |
426 int vtable_index = methodOopDesc::invalid_vtable_index; | |
427 ciMethod* call_method = dest_method; | |
428 | |
429 // Try to get the most accurate receiver type | |
430 if (is_virtual_or_interface) { | |
431 Node* receiver_node = stack(sp() - nargs); | |
432 const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr(); | |
433 ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type); | |
434 | |
435 // Have the call been sufficiently improved such that it is no longer a virtual? | |
436 if (optimized_virtual_method != NULL) { | |
437 call_method = optimized_virtual_method; | |
438 call_is_virtual = false; | |
439 } else if (!UseInlineCaches && is_virtual && call_method->is_loaded()) { | |
440 // We can make a vtable call at this site | |
441 vtable_index = call_method->resolve_vtable_index(method()->holder(), klass); | |
442 } | |
443 } | |
444 | |
445 // Note: It's OK to try to inline a virtual call. | |
446 // The call generator will not attempt to inline a polymorphic call | |
447 // unless it knows how to optimize the receiver dispatch. | |
448 bool try_inline = (C->do_inlining() || InlineAccessors); | |
449 | |
450 // --------------------- | |
451 inc_sp(- nargs); // Temporarily pop args for JVM state of call | |
452 JVMState* jvms = sync_jvms(); | |
453 | |
454 // --------------------- | |
455 // Decide call tactic. | |
456 // This call checks with CHA, the interpreter profile, intrinsics table, etc. | |
457 // It decides whether inlining is desirable or not. | |
458 CallGenerator* cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
459 | |
460 // --------------------- | |
461 // Round double arguments before call | |
462 round_double_arguments(dest_method); | |
463 | |
464 #ifndef PRODUCT | |
465 // bump global counters for calls | |
466 count_compiled_calls(false/*at_method_entry*/, cg->is_inline()); | |
467 | |
468 // Record first part of parsing work for this call | |
469 parse_histogram()->record_change(); | |
470 #endif // not PRODUCT | |
471 | |
472 assert(jvms == this->jvms(), "still operating on the right JVMS"); | |
473 assert(jvms_in_sync(), "jvms must carry full info into CG"); | |
474 | |
475 // save across call, for a subsequent cast_not_null. | |
476 Node* receiver = has_receiver ? argument(0) : NULL; | |
477 | |
478 // Bump method data counters (We profile *before* the call is made | |
479 // because exceptions don't return to the call site.) | |
480 profile_call(receiver); | |
481 | |
482 JVMState* new_jvms; | |
483 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
484 // When inlining attempt fails (e.g., too many arguments), | |
485 // it may contaminate the current compile state, making it | |
486 // impossible to pull back and try again. Once we call | |
487 // cg->generate(), we are committed. If it fails, the whole | |
488 // compilation task is compromised. | |
489 if (failing()) return; | |
490 #ifndef PRODUCT | |
491 if (PrintOpto || PrintOptoInlining || PrintInlining) { | |
492 // Only one fall-back, so if an intrinsic fails, ignore any bytecodes. | |
493 if (cg->is_intrinsic() && call_method->code_size() > 0) { | |
494 tty->print("Bailed out of intrinsic, will not inline: "); | |
495 call_method->print_name(); tty->cr(); | |
496 } | |
497 } | |
498 #endif | |
499 // This can happen if a library intrinsic is available, but refuses | |
500 // the call site, perhaps because it did not match a pattern the | |
501 // intrinsic was expecting to optimize. The fallback position is | |
502 // to call out-of-line. | |
503 try_inline = false; // Inline tactic bailed out. | |
504 cg = C->call_generator(call_method, vtable_index, call_is_virtual, jvms, try_inline, prof_factor()); | |
505 if ((new_jvms = cg->generate(jvms)) == NULL) { | |
506 guarantee(failing(), "call failed to generate: calls should work"); | |
507 return; | |
508 } | |
509 } | |
510 | |
511 if (cg->is_inline()) { | |
67 | 512 // Accumulate has_loops estimate |
513 C->set_has_loops(C->has_loops() || call_method->has_loops()); | |
0 | 514 C->env()->notice_inlined_method(call_method); |
515 } | |
516 | |
517 // Reset parser state from [new_]jvms, which now carries results of the call. | |
518 // Return value (if any) is already pushed on the stack by the cg. | |
519 add_exception_states_from(new_jvms); | |
520 if (new_jvms->map()->control() == top()) { | |
521 stop_and_kill_map(); | |
522 } else { | |
523 assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged"); | |
524 set_jvms(new_jvms); | |
525 } | |
526 | |
527 if (!stopped()) { | |
528 // This was some sort of virtual call, which did a null check for us. | |
529 // Now we can assert receiver-not-null, on the normal return path. | |
530 if (receiver != NULL && cg->is_virtual()) { | |
531 Node* cast = cast_not_null(receiver); | |
532 // %%% assert(receiver == cast, "should already have cast the receiver"); | |
533 } | |
534 | |
535 // Round double result after a call from strict to non-strict code | |
536 round_double_result(dest_method); | |
537 | |
538 // If the return type of the method is not loaded, assert that the | |
539 // value we got is a null. Otherwise, we need to recompile. | |
540 if (!dest_method->return_type()->is_loaded()) { | |
541 #ifndef PRODUCT | |
542 if (PrintOpto && (Verbose || WizardMode)) { | |
543 method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci()); | |
544 dest_method->print_name(); tty->cr(); | |
545 } | |
546 #endif | |
547 if (C->log() != NULL) { | |
548 C->log()->elem("assert_null reason='return' klass='%d'", | |
549 C->log()->identify(dest_method->return_type())); | |
550 } | |
551 // If there is going to be a trap, put it at the next bytecode: | |
552 set_bci(iter().next_bci()); | |
553 do_null_assert(peek(), T_OBJECT); | |
554 set_bci(iter().cur_bci()); // put it back | |
555 } | |
556 } | |
557 | |
558 // Restart record of parsing work after possible inlining of call | |
559 #ifndef PRODUCT | |
560 parse_histogram()->set_initial_state(bc()); | |
561 #endif | |
562 } | |
563 | |
564 //---------------------------catch_call_exceptions----------------------------- | |
565 // Put a Catch and CatchProj nodes behind a just-created call. | |
566 // Send their caught exceptions to the proper handler. | |
567 // This may be used after a call to the rethrow VM stub, | |
568 // when it is needed to process unloaded exception classes. | |
569 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) { | |
570 // Exceptions are delivered through this channel: | |
571 Node* i_o = this->i_o(); | |
572 | |
573 // Add a CatchNode. | |
574 GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1); | |
575 GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL); | |
576 GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0); | |
577 | |
578 for (; !handlers.is_done(); handlers.next()) { | |
579 ciExceptionHandler* h = handlers.handler(); | |
580 int h_bci = h->handler_bci(); | |
581 ciInstanceKlass* h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass(); | |
582 // Do not introduce unloaded exception types into the graph: | |
583 if (!h_klass->is_loaded()) { | |
584 if (saw_unloaded->contains(h_bci)) { | |
585 /* We've already seen an unloaded exception with h_bci, | |
586 so don't duplicate. Duplication will cause the CatchNode to be | |
587 unnecessarily large. See 4713716. */ | |
588 continue; | |
589 } else { | |
590 saw_unloaded->append(h_bci); | |
591 } | |
592 } | |
593 const Type* h_extype = TypeOopPtr::make_from_klass(h_klass); | |
594 // (We use make_from_klass because it respects UseUniqueSubclasses.) | |
595 h_extype = h_extype->join(TypeInstPtr::NOTNULL); | |
596 assert(!h_extype->empty(), "sanity"); | |
597 // Note: It's OK if the BCIs repeat themselves. | |
598 bcis->append(h_bci); | |
599 extypes->append(h_extype); | |
600 } | |
601 | |
602 int len = bcis->length(); | |
603 CatchNode *cn = new (C, 2) CatchNode(control(), i_o, len+1); | |
604 Node *catch_ = _gvn.transform(cn); | |
605 | |
606 // now branch with the exception state to each of the (potential) | |
607 // handlers | |
608 for(int i=0; i < len; i++) { | |
609 // Setup JVM state to enter the handler. | |
610 PreserveJVMState pjvms(this); | |
611 // Locals are just copied from before the call. | |
612 // Get control from the CatchNode. | |
613 int handler_bci = bcis->at(i); | |
614 Node* ctrl = _gvn.transform( new (C, 1) CatchProjNode(catch_, i+1,handler_bci)); | |
615 // This handler cannot happen? | |
616 if (ctrl == top()) continue; | |
617 set_control(ctrl); | |
618 | |
619 // Create exception oop | |
620 const TypeInstPtr* extype = extypes->at(i)->is_instptr(); | |
621 Node *ex_oop = _gvn.transform(new (C, 2) CreateExNode(extypes->at(i), ctrl, i_o)); | |
622 | |
623 // Handle unloaded exception classes. | |
624 if (saw_unloaded->contains(handler_bci)) { | |
625 // An unloaded exception type is coming here. Do an uncommon trap. | |
626 #ifndef PRODUCT | |
627 // We do not expect the same handler bci to take both cold unloaded | |
628 // and hot loaded exceptions. But, watch for it. | |
629 if (extype->is_loaded()) { | |
630 tty->print_cr("Warning: Handler @%d takes mixed loaded/unloaded exceptions in "); | |
631 method()->print_name(); tty->cr(); | |
632 } else if (PrintOpto && (Verbose || WizardMode)) { | |
633 tty->print("Bailing out on unloaded exception type "); | |
634 extype->klass()->print_name(); | |
635 tty->print(" at bci:%d in ", bci()); | |
636 method()->print_name(); tty->cr(); | |
637 } | |
638 #endif | |
639 // Emit an uncommon trap instead of processing the block. | |
640 set_bci(handler_bci); | |
641 push_ex_oop(ex_oop); | |
642 uncommon_trap(Deoptimization::Reason_unloaded, | |
643 Deoptimization::Action_reinterpret, | |
644 extype->klass(), "!loaded exception"); | |
645 set_bci(iter().cur_bci()); // put it back | |
646 continue; | |
647 } | |
648 | |
649 // go to the exception handler | |
650 if (handler_bci < 0) { // merge with corresponding rethrow node | |
651 throw_to_exit(make_exception_state(ex_oop)); | |
652 } else { // Else jump to corresponding handle | |
653 push_ex_oop(ex_oop); // Clear stack and push just the oop. | |
654 merge_exception(handler_bci); | |
655 } | |
656 } | |
657 | |
658 // The first CatchProj is for the normal return. | |
659 // (Note: If this is a call to rethrow_Java, this node goes dead.) | |
660 set_control(_gvn.transform( new (C, 1) CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci))); | |
661 } | |
662 | |
663 | |
664 //----------------------------catch_inline_exceptions-------------------------- | |
665 // Handle all exceptions thrown by an inlined method or individual bytecode. | |
666 // Common case 1: we have no handler, so all exceptions merge right into | |
667 // the rethrow case. | |
668 // Case 2: we have some handlers, with loaded exception klasses that have | |
669 // no subklasses. We do a Deutsch-Shiffman style type-check on the incoming | |
670 // exception oop and branch to the handler directly. | |
671 // Case 3: We have some handlers with subklasses or are not loaded at | |
672 // compile-time. We have to call the runtime to resolve the exception. | |
673 // So we insert a RethrowCall and all the logic that goes with it. | |
674 void Parse::catch_inline_exceptions(SafePointNode* ex_map) { | |
675 // Caller is responsible for saving away the map for normal control flow! | |
676 assert(stopped(), "call set_map(NULL) first"); | |
677 assert(method()->has_exception_handlers(), "don't come here w/o work to do"); | |
678 | |
679 Node* ex_node = saved_ex_oop(ex_map); | |
680 if (ex_node == top()) { | |
681 // No action needed. | |
682 return; | |
683 } | |
684 const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr(); | |
685 NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr")); | |
686 if (ex_type == NULL) | |
687 ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr(); | |
688 | |
689 // determine potential exception handlers | |
690 ciExceptionHandlerStream handlers(method(), bci(), | |
691 ex_type->klass()->as_instance_klass(), | |
692 ex_type->klass_is_exact()); | |
693 | |
694 // Start executing from the given throw state. (Keep its stack, for now.) | |
695 // Get the exception oop as known at compile time. | |
696 ex_node = use_exception_state(ex_map); | |
697 | |
698 // Get the exception oop klass from its header | |
699 Node* ex_klass_node = NULL; | |
700 if (has_ex_handler() && !ex_type->klass_is_exact()) { | |
701 Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes()); | |
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702 ex_klass_node = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 703 |
704 // Compute the exception klass a little more cleverly. | |
705 // Obvious solution is to simple do a LoadKlass from the 'ex_node'. | |
706 // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for | |
707 // each arm of the Phi. If I know something clever about the exceptions | |
708 // I'm loading the class from, I can replace the LoadKlass with the | |
709 // klass constant for the exception oop. | |
710 if( ex_node->is_Phi() ) { | |
711 ex_klass_node = new (C, ex_node->req()) PhiNode( ex_node->in(0), TypeKlassPtr::OBJECT ); | |
712 for( uint i = 1; i < ex_node->req(); i++ ) { | |
713 Node* p = basic_plus_adr( ex_node->in(i), ex_node->in(i), oopDesc::klass_offset_in_bytes() ); | |
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714 Node* k = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeInstPtr::KLASS, TypeKlassPtr::OBJECT) ); |
0 | 715 ex_klass_node->init_req( i, k ); |
716 } | |
717 _gvn.set_type(ex_klass_node, TypeKlassPtr::OBJECT); | |
718 | |
719 } | |
720 } | |
721 | |
722 // Scan the exception table for applicable handlers. | |
723 // If none, we can call rethrow() and be done! | |
724 // If precise (loaded with no subklasses), insert a D.S. style | |
725 // pointer compare to the correct handler and loop back. | |
726 // If imprecise, switch to the Rethrow VM-call style handling. | |
727 | |
728 int remaining = handlers.count_remaining(); | |
729 | |
730 // iterate through all entries sequentially | |
731 for (;!handlers.is_done(); handlers.next()) { | |
732 ciExceptionHandler* handler = handlers.handler(); | |
733 | |
734 if (handler->is_rethrow()) { | |
735 // If we fell off the end of the table without finding an imprecise | |
736 // exception klass (and without finding a generic handler) then we | |
737 // know this exception is not handled in this method. We just rethrow | |
738 // the exception into the caller. | |
739 throw_to_exit(make_exception_state(ex_node)); | |
740 return; | |
741 } | |
742 | |
743 // exception handler bci range covers throw_bci => investigate further | |
744 int handler_bci = handler->handler_bci(); | |
745 | |
746 if (remaining == 1) { | |
747 push_ex_oop(ex_node); // Push exception oop for handler | |
748 #ifndef PRODUCT | |
749 if (PrintOpto && WizardMode) { | |
750 tty->print_cr(" Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci); | |
751 } | |
752 #endif | |
753 merge_exception(handler_bci); // jump to handler | |
754 return; // No more handling to be done here! | |
755 } | |
756 | |
1344 | 757 // Get the handler's klass |
0 | 758 ciInstanceKlass* klass = handler->catch_klass(); |
1344 | 759 |
760 if (!klass->is_loaded()) { // klass is not loaded? | |
761 // fall through into catch_call_exceptions which will emit a | |
762 // handler with an uncommon trap. | |
763 break; | |
0 | 764 } |
765 | |
766 if (klass->is_interface()) // should not happen, but... | |
767 break; // bail out | |
768 | |
1344 | 769 // Check the type of the exception against the catch type |
0 | 770 const TypeKlassPtr *tk = TypeKlassPtr::make(klass); |
771 Node* con = _gvn.makecon(tk); | |
1344 | 772 Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con); |
773 if (!stopped()) { | |
774 PreserveJVMState pjvms(this); | |
775 const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr(); | |
776 assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness"); | |
0 | 777 Node* ex_oop = _gvn.transform(new (C, 2) CheckCastPPNode(control(), ex_node, tinst)); |
778 push_ex_oop(ex_oop); // Push exception oop for handler | |
779 #ifndef PRODUCT | |
780 if (PrintOpto && WizardMode) { | |
781 tty->print(" Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci); | |
782 klass->print_name(); | |
783 tty->cr(); | |
784 } | |
785 #endif | |
786 merge_exception(handler_bci); | |
787 } | |
1344 | 788 set_control(not_subtype_ctrl); |
0 | 789 |
790 // Come here if exception does not match handler. | |
791 // Carry on with more handler checks. | |
792 --remaining; | |
793 } | |
794 | |
795 assert(!stopped(), "you should return if you finish the chain"); | |
796 | |
797 // Oops, need to call into the VM to resolve the klasses at runtime. | |
798 // Note: This call must not deoptimize, since it is not a real at this bci! | |
799 kill_dead_locals(); | |
800 | |
801 make_runtime_call(RC_NO_LEAF | RC_MUST_THROW, | |
802 OptoRuntime::rethrow_Type(), | |
803 OptoRuntime::rethrow_stub(), | |
804 NULL, NULL, | |
805 ex_node); | |
806 | |
807 // Rethrow is a pure call, no side effects, only a result. | |
808 // The result cannot be allocated, so we use I_O | |
809 | |
810 // Catch exceptions from the rethrow | |
811 catch_call_exceptions(handlers); | |
812 } | |
813 | |
814 | |
815 // (Note: Moved add_debug_info into GraphKit::add_safepoint_edges.) | |
816 | |
817 | |
818 #ifndef PRODUCT | |
819 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) { | |
820 if( CountCompiledCalls ) { | |
821 if( at_method_entry ) { | |
822 // bump invocation counter if top method (for statistics) | |
823 if (CountCompiledCalls && depth() == 1) { | |
824 const TypeInstPtr* addr_type = TypeInstPtr::make(method()); | |
825 Node* adr1 = makecon(addr_type); | |
826 Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(methodOopDesc::compiled_invocation_counter_offset())); | |
827 increment_counter(adr2); | |
828 } | |
829 } else if (is_inline) { | |
830 switch (bc()) { | |
831 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_inlined_calls_addr()); break; | |
832 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break; | |
833 case Bytecodes::_invokestatic: | |
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834 case Bytecodes::_invokedynamic: |
0 | 835 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break; |
836 default: fatal("unexpected call bytecode"); | |
837 } | |
838 } else { | |
839 switch (bc()) { | |
840 case Bytecodes::_invokevirtual: increment_counter(SharedRuntime::nof_normal_calls_addr()); break; | |
841 case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break; | |
842 case Bytecodes::_invokestatic: | |
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843 case Bytecodes::_invokedynamic: |
0 | 844 case Bytecodes::_invokespecial: increment_counter(SharedRuntime::nof_static_calls_addr()); break; |
845 default: fatal("unexpected call bytecode"); | |
846 } | |
847 } | |
848 } | |
849 } | |
850 #endif //PRODUCT | |
851 | |
852 | |
853 // Identify possible target method and inlining style | |
854 ciMethod* Parse::optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass, | |
855 ciMethod *dest_method, const TypeOopPtr* receiver_type) { | |
856 // only use for virtual or interface calls | |
857 | |
858 // If it is obviously final, do not bother to call find_monomorphic_target, | |
859 // because the class hierarchy checks are not needed, and may fail due to | |
860 // incompletely loaded classes. Since we do our own class loading checks | |
861 // in this module, we may confidently bind to any method. | |
862 if (dest_method->can_be_statically_bound()) { | |
863 return dest_method; | |
864 } | |
865 | |
866 // Attempt to improve the receiver | |
867 bool actual_receiver_is_exact = false; | |
868 ciInstanceKlass* actual_receiver = klass; | |
869 if (receiver_type != NULL) { | |
870 // Array methods are all inherited from Object, and are monomorphic. | |
871 if (receiver_type->isa_aryptr() && | |
872 dest_method->holder() == env()->Object_klass()) { | |
873 return dest_method; | |
874 } | |
875 | |
876 // All other interesting cases are instance klasses. | |
877 if (!receiver_type->isa_instptr()) { | |
878 return NULL; | |
879 } | |
880 | |
881 ciInstanceKlass *ikl = receiver_type->klass()->as_instance_klass(); | |
882 if (ikl->is_loaded() && ikl->is_initialized() && !ikl->is_interface() && | |
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883 (ikl == actual_receiver || ikl->is_subtype_of(actual_receiver))) { |
0 | 884 // ikl is a same or better type than the original actual_receiver, |
885 // e.g. static receiver from bytecodes. | |
886 actual_receiver = ikl; | |
887 // Is the actual_receiver exact? | |
888 actual_receiver_is_exact = receiver_type->klass_is_exact(); | |
889 } | |
890 } | |
891 | |
892 ciInstanceKlass* calling_klass = caller->holder(); | |
893 ciMethod* cha_monomorphic_target = dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
894 if (cha_monomorphic_target != NULL) { | |
895 assert(!cha_monomorphic_target->is_abstract(), ""); | |
896 // Look at the method-receiver type. Does it add "too much information"? | |
897 ciKlass* mr_klass = cha_monomorphic_target->holder(); | |
898 const Type* mr_type = TypeInstPtr::make(TypePtr::BotPTR, mr_klass); | |
899 if (receiver_type == NULL || !receiver_type->higher_equal(mr_type)) { | |
900 // Calling this method would include an implicit cast to its holder. | |
901 // %%% Not yet implemented. Would throw minor asserts at present. | |
902 // %%% The most common wins are already gained by +UseUniqueSubclasses. | |
903 // To fix, put the higher_equal check at the call of this routine, | |
904 // and add a CheckCastPP to the receiver. | |
905 if (TraceDependencies) { | |
906 tty->print_cr("found unique CHA method, but could not cast up"); | |
907 tty->print(" method = "); | |
908 cha_monomorphic_target->print(); | |
909 tty->cr(); | |
910 } | |
911 if (C->log() != NULL) { | |
912 C->log()->elem("missed_CHA_opportunity klass='%d' method='%d'", | |
913 C->log()->identify(klass), | |
914 C->log()->identify(cha_monomorphic_target)); | |
915 } | |
916 cha_monomorphic_target = NULL; | |
917 } | |
918 } | |
919 if (cha_monomorphic_target != NULL) { | |
920 // Hardwiring a virtual. | |
921 // If we inlined because CHA revealed only a single target method, | |
922 // then we are dependent on that target method not getting overridden | |
923 // by dynamic class loading. Be sure to test the "static" receiver | |
924 // dest_method here, as opposed to the actual receiver, which may | |
925 // falsely lead us to believe that the receiver is final or private. | |
926 C->dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target); | |
927 return cha_monomorphic_target; | |
928 } | |
929 | |
930 // If the type is exact, we can still bind the method w/o a vcall. | |
931 // (This case comes after CHA so we can see how much extra work it does.) | |
932 if (actual_receiver_is_exact) { | |
933 // In case of evolution, there is a dependence on every inlined method, since each | |
934 // such method can be changed when its class is redefined. | |
935 ciMethod* exact_method = dest_method->resolve_invoke(calling_klass, actual_receiver); | |
936 if (exact_method != NULL) { | |
937 #ifndef PRODUCT | |
938 if (PrintOpto) { | |
939 tty->print(" Calling method via exact type @%d --- ", bci); | |
940 exact_method->print_name(); | |
941 tty->cr(); | |
942 } | |
943 #endif | |
944 return exact_method; | |
945 } | |
946 } | |
947 | |
948 return NULL; | |
949 } |