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annotate src/share/vm/opto/callGenerator.hpp @ 2142:8012aa3ccede
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Reviewed-by: coleenp, jrose, kvn, dcubed
author | never |
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date | Thu, 13 Jan 2011 22:15:41 -0800 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, 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 | |
28 #include "opto/callnode.hpp" | |
29 #include "opto/compile.hpp" | |
30 #include "opto/type.hpp" | |
31 #include "runtime/deoptimization.hpp" | |
32 | |
0 | 33 //---------------------------CallGenerator------------------------------------- |
34 // The subclasses of this class handle generation of ideal nodes for | |
35 // call sites and method entry points. | |
36 | |
37 class CallGenerator : public ResourceObj { | |
38 public: | |
39 enum { | |
40 xxxunusedxxx | |
41 }; | |
42 | |
43 private: | |
44 ciMethod* _method; // The method being called. | |
45 | |
46 protected: | |
47 CallGenerator(ciMethod* method); | |
48 | |
49 public: | |
50 // Accessors | |
51 ciMethod* method() const { return _method; } | |
52 | |
53 // is_inline: At least some code implementing the method is copied here. | |
54 virtual bool is_inline() const { return false; } | |
55 // is_intrinsic: There's a method-specific way of generating the inline code. | |
56 virtual bool is_intrinsic() const { return false; } | |
57 // is_parse: Bytecodes implementing the specific method are copied here. | |
58 virtual bool is_parse() const { return false; } | |
59 // is_virtual: The call uses the receiver type to select or check the method. | |
60 virtual bool is_virtual() const { return false; } | |
61 // is_deferred: The decision whether to inline or not is deferred. | |
62 virtual bool is_deferred() const { return false; } | |
63 // is_predicted: Uses an explicit check against a predicted type. | |
64 virtual bool is_predicted() const { return false; } | |
65 // is_trap: Does not return to the caller. (E.g., uncommon trap.) | |
66 virtual bool is_trap() const { return false; } | |
67 | |
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68 // is_late_inline: supports conversion of call into an inline |
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69 virtual bool is_late_inline() const { return false; } |
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70 // Replace the call with an inline version of the code |
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71 virtual void do_late_inline() { ShouldNotReachHere(); } |
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72 |
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73 virtual CallStaticJavaNode* call_node() const { ShouldNotReachHere(); return NULL; } |
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74 |
0 | 75 // Note: It is possible for a CG to be both inline and virtual. |
76 // (The hashCode intrinsic does a vtable check and an inlined fast path.) | |
77 | |
78 // Utilities: | |
79 const TypeFunc* tf() const; | |
80 | |
81 // The given jvms has state and arguments for a call to my method. | |
82 // Edges after jvms->argoff() carry all (pre-popped) argument values. | |
83 // | |
84 // Update the map with state and return values (if any) and return it. | |
85 // The return values (0, 1, or 2) must be pushed on the map's stack, | |
86 // and the sp of the jvms incremented accordingly. | |
87 // | |
88 // The jvms is returned on success. Alternatively, a copy of the | |
89 // given jvms, suitably updated, may be returned, in which case the | |
90 // caller should discard the original jvms. | |
91 // | |
92 // The non-Parm edges of the returned map will contain updated global state, | |
93 // and one or two edges before jvms->sp() will carry any return values. | |
94 // Other map edges may contain locals or monitors, and should not | |
95 // be changed in meaning. | |
96 // | |
97 // If the call traps, the returned map must have a control edge of top. | |
98 // If the call can throw, the returned map must report has_exceptions(). | |
99 // | |
100 // If the result is NULL, it means that this CallGenerator was unable | |
101 // to handle the given call, and another CallGenerator should be consulted. | |
102 virtual JVMState* generate(JVMState* jvms) = 0; | |
103 | |
104 // How to generate a call site that is inlined: | |
105 static CallGenerator* for_inline(ciMethod* m, float expected_uses = -1); | |
106 // How to generate code for an on-stack replacement handler. | |
107 static CallGenerator* for_osr(ciMethod* m, int osr_bci); | |
108 | |
109 // How to generate vanilla out-of-line call sites: | |
1080
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110 static CallGenerator* for_direct_call(ciMethod* m, bool separate_io_projs = false); // static, special |
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111 static CallGenerator* for_dynamic_call(ciMethod* m); // invokedynamic |
0 | 112 static CallGenerator* for_virtual_call(ciMethod* m, int vtable_index); // virtual, interface |
113 | |
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114 // How to generate a replace a direct call with an inline version |
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115 static CallGenerator* for_late_inline(ciMethod* m, CallGenerator* inline_cg); |
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116 |
0 | 117 // How to make a call but defer the decision whether to inline or not. |
118 static CallGenerator* for_warm_call(WarmCallInfo* ci, | |
119 CallGenerator* if_cold, | |
120 CallGenerator* if_hot); | |
121 | |
122 // How to make a call that optimistically assumes a receiver type: | |
123 static CallGenerator* for_predicted_call(ciKlass* predicted_receiver, | |
124 CallGenerator* if_missed, | |
125 CallGenerator* if_hit, | |
126 float hit_prob); | |
127 | |
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128 // How to make a call that optimistically assumes a MethodHandle target: |
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129 static CallGenerator* for_predicted_dynamic_call(ciMethodHandle* predicted_method_handle, |
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130 CallGenerator* if_missed, |
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131 CallGenerator* if_hit, |
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132 float hit_prob); |
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133 |
0 | 134 // How to make a call that gives up and goes back to the interpreter: |
135 static CallGenerator* for_uncommon_trap(ciMethod* m, | |
136 Deoptimization::DeoptReason reason, | |
137 Deoptimization::DeoptAction action); | |
138 | |
139 // Registry for intrinsics: | |
140 static CallGenerator* for_intrinsic(ciMethod* m); | |
141 static void register_intrinsic(ciMethod* m, CallGenerator* cg); | |
142 }; | |
143 | |
144 class InlineCallGenerator : public CallGenerator { | |
145 virtual bool is_inline() const { return true; } | |
146 | |
147 protected: | |
148 InlineCallGenerator(ciMethod* method) : CallGenerator(method) { } | |
149 }; | |
150 | |
151 | |
152 //---------------------------WarmCallInfo-------------------------------------- | |
153 // A struct to collect information about a given call site. | |
154 // Helps sort call sites into "hot", "medium", and "cold". | |
155 // Participates in the queueing of "medium" call sites for possible inlining. | |
156 class WarmCallInfo : public ResourceObj { | |
157 private: | |
158 | |
159 CallNode* _call; // The CallNode which may be inlined. | |
160 CallGenerator* _hot_cg;// CG for expanding the call node | |
161 | |
162 // These are the metrics we use to evaluate call sites: | |
163 | |
164 float _count; // How often do we expect to reach this site? | |
165 float _profit; // How much time do we expect to save by inlining? | |
166 float _work; // How long do we expect the average call to take? | |
167 float _size; // How big do we expect the inlined code to be? | |
168 | |
169 float _heat; // Combined score inducing total order on call sites. | |
170 WarmCallInfo* _next; // Next cooler call info in pending queue. | |
171 | |
172 // Count is the number of times this call site is expected to be executed. | |
173 // Large count is favorable for inlining, because the extra compilation | |
174 // work will be amortized more completely. | |
175 | |
176 // Profit is a rough measure of the amount of time we expect to save | |
177 // per execution of this site if we inline it. (1.0 == call overhead) | |
178 // Large profit favors inlining. Negative profit disables inlining. | |
179 | |
180 // Work is a rough measure of the amount of time a typical out-of-line | |
181 // call from this site is expected to take. (1.0 == call, no-op, return) | |
182 // Small work is somewhat favorable for inlining, since methods with | |
183 // short "hot" traces are more likely to inline smoothly. | |
184 | |
185 // Size is the number of graph nodes we expect this method to produce, | |
186 // not counting the inlining of any further warm calls it may include. | |
187 // Small size favors inlining, since small methods are more likely to | |
188 // inline smoothly. The size is estimated by examining the native code | |
189 // if available. The method bytecodes are also examined, assuming | |
190 // empirically observed node counts for each kind of bytecode. | |
191 | |
192 // Heat is the combined "goodness" of a site's inlining. If we were | |
193 // omniscient, it would be the difference of two sums of future execution | |
194 // times of code emitted for this site (amortized across multiple sites if | |
195 // sharing applies). The two sums are for versions of this call site with | |
196 // and without inlining. | |
197 | |
198 // We approximate this mythical quantity by playing with averages, | |
199 // rough estimates, and assumptions that history repeats itself. | |
200 // The basic formula count * profit is heuristically adjusted | |
201 // by looking at the expected compilation and execution times of | |
202 // of the inlined call. | |
203 | |
204 // Note: Some of these metrics may not be present in the final product, | |
205 // but exist in development builds to experiment with inline policy tuning. | |
206 | |
207 // This heuristic framework does not model well the very significant | |
208 // effects of multiple-level inlining. It is possible to see no immediate | |
209 // profit from inlining X->Y, but to get great profit from a subsequent | |
210 // inlining X->Y->Z. | |
211 | |
212 // This framework does not take well into account the problem of N**2 code | |
213 // size in a clique of mutually inlinable methods. | |
214 | |
215 WarmCallInfo* next() const { return _next; } | |
216 void set_next(WarmCallInfo* n) { _next = n; } | |
217 | |
218 static WarmCallInfo* _always_hot; | |
219 static WarmCallInfo* _always_cold; | |
220 | |
221 public: | |
222 // Because WarmInfo objects live over the entire lifetime of the | |
223 // Compile object, they are allocated into the comp_arena, which | |
224 // does not get resource marked or reset during the compile process | |
225 void *operator new( size_t x, Compile* C ) { return C->comp_arena()->Amalloc(x); } | |
226 void operator delete( void * ) { } // fast deallocation | |
227 | |
228 static WarmCallInfo* always_hot(); | |
229 static WarmCallInfo* always_cold(); | |
230 | |
231 WarmCallInfo() { | |
232 _call = NULL; | |
233 _hot_cg = NULL; | |
234 _next = NULL; | |
235 _count = _profit = _work = _size = _heat = 0; | |
236 } | |
237 | |
238 CallNode* call() const { return _call; } | |
239 float count() const { return _count; } | |
240 float size() const { return _size; } | |
241 float work() const { return _work; } | |
242 float profit() const { return _profit; } | |
243 float heat() const { return _heat; } | |
244 | |
245 void set_count(float x) { _count = x; } | |
246 void set_size(float x) { _size = x; } | |
247 void set_work(float x) { _work = x; } | |
248 void set_profit(float x) { _profit = x; } | |
249 void set_heat(float x) { _heat = x; } | |
250 | |
251 // Load initial heuristics from profiles, etc. | |
252 // The heuristics can be tweaked further by the caller. | |
253 void init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor); | |
254 | |
255 static float MAX_VALUE() { return +1.0e10; } | |
256 static float MIN_VALUE() { return -1.0e10; } | |
257 | |
258 float compute_heat() const; | |
259 | |
260 void set_call(CallNode* call) { _call = call; } | |
261 void set_hot_cg(CallGenerator* cg) { _hot_cg = cg; } | |
262 | |
263 // Do not queue very hot or very cold calls. | |
264 // Make very cold ones out of line immediately. | |
265 // Inline very hot ones immediately. | |
266 // These queries apply various tunable limits | |
267 // to the above metrics in a systematic way. | |
268 // Test for coldness before testing for hotness. | |
269 bool is_cold() const; | |
270 bool is_hot() const; | |
271 | |
272 // Force a warm call to be hot. This worklists the call node for inlining. | |
273 void make_hot(); | |
274 | |
275 // Force a warm call to be cold. This worklists the call node for out-of-lining. | |
276 void make_cold(); | |
277 | |
278 // A reproducible total ordering, in which heat is the major key. | |
279 bool warmer_than(WarmCallInfo* that); | |
280 | |
281 // List management. These methods are called with the list head, | |
282 // and return the new list head, inserting or removing the receiver. | |
283 WarmCallInfo* insert_into(WarmCallInfo* head); | |
284 WarmCallInfo* remove_from(WarmCallInfo* head); | |
285 | |
286 #ifndef PRODUCT | |
287 void print() const; | |
288 void print_all() const; | |
289 int count_all() const; | |
290 #endif | |
291 }; | |
1972 | 292 |
293 #endif // SHARE_VM_OPTO_CALLGENERATOR_HPP |