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annotate src/share/vm/opto/callGenerator.hpp @ 20317:ee019285a52c
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, 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 #ifndef SHARE_VM_OPTO_CALLGENERATOR_HPP |
26 #define SHARE_VM_OPTO_CALLGENERATOR_HPP | |
27 | |
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28 #include "compiler/compileBroker.hpp" |
1972 | 29 #include "opto/callnode.hpp" |
30 #include "opto/compile.hpp" | |
31 #include "opto/type.hpp" | |
32 #include "runtime/deoptimization.hpp" | |
33 | |
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34 class Parse; |
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35 |
0 | 36 //---------------------------CallGenerator------------------------------------- |
37 // The subclasses of this class handle generation of ideal nodes for | |
38 // call sites and method entry points. | |
39 | |
40 class CallGenerator : public ResourceObj { | |
41 public: | |
42 enum { | |
43 xxxunusedxxx | |
44 }; | |
45 | |
46 private: | |
47 ciMethod* _method; // The method being called. | |
48 | |
49 protected: | |
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50 CallGenerator(ciMethod* method) : _method(method) {} |
0 | 51 |
52 public: | |
53 // Accessors | |
54 ciMethod* method() const { return _method; } | |
55 | |
56 // is_inline: At least some code implementing the method is copied here. | |
57 virtual bool is_inline() const { return false; } | |
58 // is_intrinsic: There's a method-specific way of generating the inline code. | |
59 virtual bool is_intrinsic() const { return false; } | |
60 // is_parse: Bytecodes implementing the specific method are copied here. | |
61 virtual bool is_parse() const { return false; } | |
62 // is_virtual: The call uses the receiver type to select or check the method. | |
63 virtual bool is_virtual() const { return false; } | |
64 // is_deferred: The decision whether to inline or not is deferred. | |
65 virtual bool is_deferred() const { return false; } | |
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66 // is_predicated: Uses an explicit check (predicate). |
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67 virtual bool is_predicated() const { return false; } |
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68 virtual int predicates_count() const { return 0; } |
0 | 69 // is_trap: Does not return to the caller. (E.g., uncommon trap.) |
70 virtual bool is_trap() const { return false; } | |
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71 // does_virtual_dispatch: Should try inlining as normal method first. |
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72 virtual bool does_virtual_dispatch() const { return false; } |
0 | 73 |
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74 // is_late_inline: supports conversion of call into an inline |
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75 virtual bool is_late_inline() const { return false; } |
7473 | 76 // same but for method handle calls |
77 virtual bool is_mh_late_inline() const { return false; } | |
12966 | 78 virtual bool is_string_late_inline() const{ return false; } |
7473 | 79 |
80 // for method handle calls: have we tried inlinining the call already? | |
81 virtual bool already_attempted() const { ShouldNotReachHere(); return false; } | |
82 | |
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83 // Replace the call with an inline version of the code |
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84 virtual void do_late_inline() { ShouldNotReachHere(); } |
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85 |
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86 virtual CallStaticJavaNode* call_node() const { ShouldNotReachHere(); return NULL; } |
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87 |
0 | 88 // Note: It is possible for a CG to be both inline and virtual. |
89 // (The hashCode intrinsic does a vtable check and an inlined fast path.) | |
90 | |
91 // Utilities: | |
92 const TypeFunc* tf() const; | |
93 | |
94 // The given jvms has state and arguments for a call to my method. | |
95 // Edges after jvms->argoff() carry all (pre-popped) argument values. | |
96 // | |
97 // Update the map with state and return values (if any) and return it. | |
98 // The return values (0, 1, or 2) must be pushed on the map's stack, | |
99 // and the sp of the jvms incremented accordingly. | |
100 // | |
101 // The jvms is returned on success. Alternatively, a copy of the | |
102 // given jvms, suitably updated, may be returned, in which case the | |
103 // caller should discard the original jvms. | |
104 // | |
105 // The non-Parm edges of the returned map will contain updated global state, | |
106 // and one or two edges before jvms->sp() will carry any return values. | |
107 // Other map edges may contain locals or monitors, and should not | |
108 // be changed in meaning. | |
109 // | |
110 // If the call traps, the returned map must have a control edge of top. | |
111 // If the call can throw, the returned map must report has_exceptions(). | |
112 // | |
113 // If the result is NULL, it means that this CallGenerator was unable | |
114 // to handle the given call, and another CallGenerator should be consulted. | |
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115 virtual JVMState* generate(JVMState* jvms, Parse* parent_parser) = 0; |
0 | 116 |
117 // How to generate a call site that is inlined: | |
118 static CallGenerator* for_inline(ciMethod* m, float expected_uses = -1); | |
119 // How to generate code for an on-stack replacement handler. | |
120 static CallGenerator* for_osr(ciMethod* m, int osr_bci); | |
121 | |
122 // How to generate vanilla out-of-line call sites: | |
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123 static CallGenerator* for_direct_call(ciMethod* m, bool separate_io_projs = false); // static, special |
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124 static CallGenerator* for_virtual_call(ciMethod* m, int vtable_index); // virtual, interface |
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125 static CallGenerator* for_dynamic_call(ciMethod* m); // invokedynamic |
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126 |
7473 | 127 static CallGenerator* for_method_handle_call( JVMState* jvms, ciMethod* caller, ciMethod* callee, bool delayed_forbidden); |
128 static CallGenerator* for_method_handle_inline(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool& input_not_const); | |
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129 |
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130 // How to generate a replace a direct call with an inline version |
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131 static CallGenerator* for_late_inline(ciMethod* m, CallGenerator* inline_cg); |
7473 | 132 static CallGenerator* for_mh_late_inline(ciMethod* caller, ciMethod* callee, bool input_not_const); |
133 static CallGenerator* for_string_late_inline(ciMethod* m, CallGenerator* inline_cg); | |
10278 | 134 static CallGenerator* for_boxing_late_inline(ciMethod* m, CallGenerator* inline_cg); |
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135 |
0 | 136 // How to make a call but defer the decision whether to inline or not. |
137 static CallGenerator* for_warm_call(WarmCallInfo* ci, | |
138 CallGenerator* if_cold, | |
139 CallGenerator* if_hot); | |
140 | |
141 // How to make a call that optimistically assumes a receiver type: | |
142 static CallGenerator* for_predicted_call(ciKlass* predicted_receiver, | |
143 CallGenerator* if_missed, | |
144 CallGenerator* if_hit, | |
145 float hit_prob); | |
146 | |
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147 // How to make a call that optimistically assumes a MethodHandle target: |
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148 static CallGenerator* for_predicted_dynamic_call(ciMethodHandle* predicted_method_handle, |
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149 CallGenerator* if_missed, |
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150 CallGenerator* if_hit, |
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151 float hit_prob); |
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152 |
0 | 153 // How to make a call that gives up and goes back to the interpreter: |
154 static CallGenerator* for_uncommon_trap(ciMethod* m, | |
155 Deoptimization::DeoptReason reason, | |
156 Deoptimization::DeoptAction action); | |
157 | |
158 // Registry for intrinsics: | |
159 static CallGenerator* for_intrinsic(ciMethod* m); | |
160 static void register_intrinsic(ciMethod* m, CallGenerator* cg); | |
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161 static CallGenerator* for_predicated_intrinsic(CallGenerator* intrinsic, |
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162 CallGenerator* cg); |
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163 virtual Node* generate_predicate(JVMState* jvms, int predicate) { return NULL; }; |
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164 |
7473 | 165 virtual void print_inlining_late(const char* msg) { ShouldNotReachHere(); } |
166 | |
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167 static void print_inlining(Compile* C, ciMethod* callee, int inline_level, int bci, const char* msg) { |
12295 | 168 if (C->print_inlining()) { |
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169 C->print_inlining(callee, inline_level, bci, msg); |
12295 | 170 } |
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171 } |
0 | 172 }; |
173 | |
174 | |
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175 //------------------------InlineCallGenerator---------------------------------- |
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176 class InlineCallGenerator : public CallGenerator { |
0 | 177 protected: |
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178 InlineCallGenerator(ciMethod* method) : CallGenerator(method) {} |
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179 |
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180 public: |
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181 virtual bool is_inline() const { return true; } |
0 | 182 }; |
183 | |
184 | |
185 //---------------------------WarmCallInfo-------------------------------------- | |
186 // A struct to collect information about a given call site. | |
187 // Helps sort call sites into "hot", "medium", and "cold". | |
188 // Participates in the queueing of "medium" call sites for possible inlining. | |
189 class WarmCallInfo : public ResourceObj { | |
190 private: | |
191 | |
192 CallNode* _call; // The CallNode which may be inlined. | |
193 CallGenerator* _hot_cg;// CG for expanding the call node | |
194 | |
195 // These are the metrics we use to evaluate call sites: | |
196 | |
197 float _count; // How often do we expect to reach this site? | |
198 float _profit; // How much time do we expect to save by inlining? | |
199 float _work; // How long do we expect the average call to take? | |
200 float _size; // How big do we expect the inlined code to be? | |
201 | |
202 float _heat; // Combined score inducing total order on call sites. | |
203 WarmCallInfo* _next; // Next cooler call info in pending queue. | |
204 | |
205 // Count is the number of times this call site is expected to be executed. | |
206 // Large count is favorable for inlining, because the extra compilation | |
207 // work will be amortized more completely. | |
208 | |
209 // Profit is a rough measure of the amount of time we expect to save | |
210 // per execution of this site if we inline it. (1.0 == call overhead) | |
211 // Large profit favors inlining. Negative profit disables inlining. | |
212 | |
213 // Work is a rough measure of the amount of time a typical out-of-line | |
214 // call from this site is expected to take. (1.0 == call, no-op, return) | |
215 // Small work is somewhat favorable for inlining, since methods with | |
216 // short "hot" traces are more likely to inline smoothly. | |
217 | |
218 // Size is the number of graph nodes we expect this method to produce, | |
219 // not counting the inlining of any further warm calls it may include. | |
220 // Small size favors inlining, since small methods are more likely to | |
221 // inline smoothly. The size is estimated by examining the native code | |
222 // if available. The method bytecodes are also examined, assuming | |
223 // empirically observed node counts for each kind of bytecode. | |
224 | |
225 // Heat is the combined "goodness" of a site's inlining. If we were | |
226 // omniscient, it would be the difference of two sums of future execution | |
227 // times of code emitted for this site (amortized across multiple sites if | |
228 // sharing applies). The two sums are for versions of this call site with | |
229 // and without inlining. | |
230 | |
231 // We approximate this mythical quantity by playing with averages, | |
232 // rough estimates, and assumptions that history repeats itself. | |
233 // The basic formula count * profit is heuristically adjusted | |
234 // by looking at the expected compilation and execution times of | |
235 // of the inlined call. | |
236 | |
237 // Note: Some of these metrics may not be present in the final product, | |
238 // but exist in development builds to experiment with inline policy tuning. | |
239 | |
240 // This heuristic framework does not model well the very significant | |
241 // effects of multiple-level inlining. It is possible to see no immediate | |
242 // profit from inlining X->Y, but to get great profit from a subsequent | |
243 // inlining X->Y->Z. | |
244 | |
245 // This framework does not take well into account the problem of N**2 code | |
246 // size in a clique of mutually inlinable methods. | |
247 | |
248 WarmCallInfo* next() const { return _next; } | |
249 void set_next(WarmCallInfo* n) { _next = n; } | |
250 | |
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251 static WarmCallInfo _always_hot; |
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252 static WarmCallInfo _always_cold; |
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253 |
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254 // Constructor intitialization of always_hot and always_cold |
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255 WarmCallInfo(float c, float p, float w, float s) { |
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256 _call = NULL; |
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257 _hot_cg = NULL; |
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258 _next = NULL; |
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259 _count = c; |
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260 _profit = p; |
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261 _work = w; |
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262 _size = s; |
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263 _heat = 0; |
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264 } |
0 | 265 |
266 public: | |
267 // Because WarmInfo objects live over the entire lifetime of the | |
268 // Compile object, they are allocated into the comp_arena, which | |
269 // does not get resource marked or reset during the compile process | |
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270 void *operator new( size_t x, Compile* C ) throw() { return C->comp_arena()->Amalloc(x); } |
0 | 271 void operator delete( void * ) { } // fast deallocation |
272 | |
273 static WarmCallInfo* always_hot(); | |
274 static WarmCallInfo* always_cold(); | |
275 | |
276 WarmCallInfo() { | |
277 _call = NULL; | |
278 _hot_cg = NULL; | |
279 _next = NULL; | |
280 _count = _profit = _work = _size = _heat = 0; | |
281 } | |
282 | |
283 CallNode* call() const { return _call; } | |
284 float count() const { return _count; } | |
285 float size() const { return _size; } | |
286 float work() const { return _work; } | |
287 float profit() const { return _profit; } | |
288 float heat() const { return _heat; } | |
289 | |
290 void set_count(float x) { _count = x; } | |
291 void set_size(float x) { _size = x; } | |
292 void set_work(float x) { _work = x; } | |
293 void set_profit(float x) { _profit = x; } | |
294 void set_heat(float x) { _heat = x; } | |
295 | |
296 // Load initial heuristics from profiles, etc. | |
297 // The heuristics can be tweaked further by the caller. | |
298 void init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor); | |
299 | |
300 static float MAX_VALUE() { return +1.0e10; } | |
301 static float MIN_VALUE() { return -1.0e10; } | |
302 | |
303 float compute_heat() const; | |
304 | |
305 void set_call(CallNode* call) { _call = call; } | |
306 void set_hot_cg(CallGenerator* cg) { _hot_cg = cg; } | |
307 | |
308 // Do not queue very hot or very cold calls. | |
309 // Make very cold ones out of line immediately. | |
310 // Inline very hot ones immediately. | |
311 // These queries apply various tunable limits | |
312 // to the above metrics in a systematic way. | |
313 // Test for coldness before testing for hotness. | |
314 bool is_cold() const; | |
315 bool is_hot() const; | |
316 | |
317 // Force a warm call to be hot. This worklists the call node for inlining. | |
318 void make_hot(); | |
319 | |
320 // Force a warm call to be cold. This worklists the call node for out-of-lining. | |
321 void make_cold(); | |
322 | |
323 // A reproducible total ordering, in which heat is the major key. | |
324 bool warmer_than(WarmCallInfo* that); | |
325 | |
326 // List management. These methods are called with the list head, | |
327 // and return the new list head, inserting or removing the receiver. | |
328 WarmCallInfo* insert_into(WarmCallInfo* head); | |
329 WarmCallInfo* remove_from(WarmCallInfo* head); | |
330 | |
331 #ifndef PRODUCT | |
332 void print() const; | |
333 void print_all() const; | |
334 int count_all() const; | |
335 #endif | |
336 }; | |
1972 | 337 |
338 #endif // SHARE_VM_OPTO_CALLGENERATOR_HPP |