Tue, 24 Sep 2013 16:08:00 -0700
8022585: VM crashes when ran with -XX:+PrintInlining
Summary: use adr_at() to access inline info structures in growableArray. Add ability to specify print inlining per method.
Reviewed-by: twisti
1 /*
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25 #ifndef SHARE_VM_OPTO_CALLGENERATOR_HPP
26 #define SHARE_VM_OPTO_CALLGENERATOR_HPP
28 #include "compiler/compileBroker.hpp"
29 #include "opto/callnode.hpp"
30 #include "opto/compile.hpp"
31 #include "opto/type.hpp"
32 #include "runtime/deoptimization.hpp"
34 //---------------------------CallGenerator-------------------------------------
35 // The subclasses of this class handle generation of ideal nodes for
36 // call sites and method entry points.
38 class CallGenerator : public ResourceObj {
39 public:
40 enum {
41 xxxunusedxxx
42 };
44 private:
45 ciMethod* _method; // The method being called.
47 protected:
48 CallGenerator(ciMethod* method) : _method(method) {}
50 public:
51 // Accessors
52 ciMethod* method() const { return _method; }
54 // is_inline: At least some code implementing the method is copied here.
55 virtual bool is_inline() const { return false; }
56 // is_intrinsic: There's a method-specific way of generating the inline code.
57 virtual bool is_intrinsic() const { return false; }
58 // is_parse: Bytecodes implementing the specific method are copied here.
59 virtual bool is_parse() const { return false; }
60 // is_virtual: The call uses the receiver type to select or check the method.
61 virtual bool is_virtual() const { return false; }
62 // is_deferred: The decision whether to inline or not is deferred.
63 virtual bool is_deferred() const { return false; }
64 // is_predicted: Uses an explicit check against a predicted type.
65 virtual bool is_predicted() const { return false; }
66 // is_trap: Does not return to the caller. (E.g., uncommon trap.)
67 virtual bool is_trap() const { return false; }
69 // is_late_inline: supports conversion of call into an inline
70 virtual bool is_late_inline() const { return false; }
71 // same but for method handle calls
72 virtual bool is_mh_late_inline() const { return false; }
74 // for method handle calls: have we tried inlinining the call already?
75 virtual bool already_attempted() const { ShouldNotReachHere(); return false; }
77 // Replace the call with an inline version of the code
78 virtual void do_late_inline() { ShouldNotReachHere(); }
80 virtual CallStaticJavaNode* call_node() const { ShouldNotReachHere(); return NULL; }
82 // Note: It is possible for a CG to be both inline and virtual.
83 // (The hashCode intrinsic does a vtable check and an inlined fast path.)
85 // Utilities:
86 const TypeFunc* tf() const;
88 // The given jvms has state and arguments for a call to my method.
89 // Edges after jvms->argoff() carry all (pre-popped) argument values.
90 //
91 // Update the map with state and return values (if any) and return it.
92 // The return values (0, 1, or 2) must be pushed on the map's stack,
93 // and the sp of the jvms incremented accordingly.
94 //
95 // The jvms is returned on success. Alternatively, a copy of the
96 // given jvms, suitably updated, may be returned, in which case the
97 // caller should discard the original jvms.
98 //
99 // The non-Parm edges of the returned map will contain updated global state,
100 // and one or two edges before jvms->sp() will carry any return values.
101 // Other map edges may contain locals or monitors, and should not
102 // be changed in meaning.
103 //
104 // If the call traps, the returned map must have a control edge of top.
105 // If the call can throw, the returned map must report has_exceptions().
106 //
107 // If the result is NULL, it means that this CallGenerator was unable
108 // to handle the given call, and another CallGenerator should be consulted.
109 virtual JVMState* generate(JVMState* jvms) = 0;
111 // How to generate a call site that is inlined:
112 static CallGenerator* for_inline(ciMethod* m, float expected_uses = -1);
113 // How to generate code for an on-stack replacement handler.
114 static CallGenerator* for_osr(ciMethod* m, int osr_bci);
116 // How to generate vanilla out-of-line call sites:
117 static CallGenerator* for_direct_call(ciMethod* m, bool separate_io_projs = false); // static, special
118 static CallGenerator* for_virtual_call(ciMethod* m, int vtable_index); // virtual, interface
119 static CallGenerator* for_dynamic_call(ciMethod* m); // invokedynamic
121 static CallGenerator* for_method_handle_call( JVMState* jvms, ciMethod* caller, ciMethod* callee, bool delayed_forbidden);
122 static CallGenerator* for_method_handle_inline(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool& input_not_const);
124 // How to generate a replace a direct call with an inline version
125 static CallGenerator* for_late_inline(ciMethod* m, CallGenerator* inline_cg);
126 static CallGenerator* for_mh_late_inline(ciMethod* caller, ciMethod* callee, bool input_not_const);
127 static CallGenerator* for_string_late_inline(ciMethod* m, CallGenerator* inline_cg);
128 static CallGenerator* for_boxing_late_inline(ciMethod* m, CallGenerator* inline_cg);
130 // How to make a call but defer the decision whether to inline or not.
131 static CallGenerator* for_warm_call(WarmCallInfo* ci,
132 CallGenerator* if_cold,
133 CallGenerator* if_hot);
135 // How to make a call that optimistically assumes a receiver type:
136 static CallGenerator* for_predicted_call(ciKlass* predicted_receiver,
137 CallGenerator* if_missed,
138 CallGenerator* if_hit,
139 float hit_prob);
141 // How to make a call that optimistically assumes a MethodHandle target:
142 static CallGenerator* for_predicted_dynamic_call(ciMethodHandle* predicted_method_handle,
143 CallGenerator* if_missed,
144 CallGenerator* if_hit,
145 float hit_prob);
147 // How to make a call that gives up and goes back to the interpreter:
148 static CallGenerator* for_uncommon_trap(ciMethod* m,
149 Deoptimization::DeoptReason reason,
150 Deoptimization::DeoptAction action);
152 // Registry for intrinsics:
153 static CallGenerator* for_intrinsic(ciMethod* m);
154 static void register_intrinsic(ciMethod* m, CallGenerator* cg);
155 static CallGenerator* for_predicted_intrinsic(CallGenerator* intrinsic,
156 CallGenerator* cg);
157 virtual Node* generate_predicate(JVMState* jvms) { return NULL; };
159 virtual void print_inlining_late(const char* msg) { ShouldNotReachHere(); }
161 static void print_inlining(Compile* C, ciMethod* callee, int inline_level, int bci, const char* msg) {
162 if (C->print_inlining()) {
163 C->print_inlining(callee, inline_level, bci, msg);
164 }
165 }
166 };
169 //------------------------InlineCallGenerator----------------------------------
170 class InlineCallGenerator : public CallGenerator {
171 protected:
172 InlineCallGenerator(ciMethod* method) : CallGenerator(method) {}
174 public:
175 virtual bool is_inline() const { return true; }
176 };
179 //---------------------------WarmCallInfo--------------------------------------
180 // A struct to collect information about a given call site.
181 // Helps sort call sites into "hot", "medium", and "cold".
182 // Participates in the queueing of "medium" call sites for possible inlining.
183 class WarmCallInfo : public ResourceObj {
184 private:
186 CallNode* _call; // The CallNode which may be inlined.
187 CallGenerator* _hot_cg;// CG for expanding the call node
189 // These are the metrics we use to evaluate call sites:
191 float _count; // How often do we expect to reach this site?
192 float _profit; // How much time do we expect to save by inlining?
193 float _work; // How long do we expect the average call to take?
194 float _size; // How big do we expect the inlined code to be?
196 float _heat; // Combined score inducing total order on call sites.
197 WarmCallInfo* _next; // Next cooler call info in pending queue.
199 // Count is the number of times this call site is expected to be executed.
200 // Large count is favorable for inlining, because the extra compilation
201 // work will be amortized more completely.
203 // Profit is a rough measure of the amount of time we expect to save
204 // per execution of this site if we inline it. (1.0 == call overhead)
205 // Large profit favors inlining. Negative profit disables inlining.
207 // Work is a rough measure of the amount of time a typical out-of-line
208 // call from this site is expected to take. (1.0 == call, no-op, return)
209 // Small work is somewhat favorable for inlining, since methods with
210 // short "hot" traces are more likely to inline smoothly.
212 // Size is the number of graph nodes we expect this method to produce,
213 // not counting the inlining of any further warm calls it may include.
214 // Small size favors inlining, since small methods are more likely to
215 // inline smoothly. The size is estimated by examining the native code
216 // if available. The method bytecodes are also examined, assuming
217 // empirically observed node counts for each kind of bytecode.
219 // Heat is the combined "goodness" of a site's inlining. If we were
220 // omniscient, it would be the difference of two sums of future execution
221 // times of code emitted for this site (amortized across multiple sites if
222 // sharing applies). The two sums are for versions of this call site with
223 // and without inlining.
225 // We approximate this mythical quantity by playing with averages,
226 // rough estimates, and assumptions that history repeats itself.
227 // The basic formula count * profit is heuristically adjusted
228 // by looking at the expected compilation and execution times of
229 // of the inlined call.
231 // Note: Some of these metrics may not be present in the final product,
232 // but exist in development builds to experiment with inline policy tuning.
234 // This heuristic framework does not model well the very significant
235 // effects of multiple-level inlining. It is possible to see no immediate
236 // profit from inlining X->Y, but to get great profit from a subsequent
237 // inlining X->Y->Z.
239 // This framework does not take well into account the problem of N**2 code
240 // size in a clique of mutually inlinable methods.
242 WarmCallInfo* next() const { return _next; }
243 void set_next(WarmCallInfo* n) { _next = n; }
245 static WarmCallInfo _always_hot;
246 static WarmCallInfo _always_cold;
248 // Constructor intitialization of always_hot and always_cold
249 WarmCallInfo(float c, float p, float w, float s) {
250 _call = NULL;
251 _hot_cg = NULL;
252 _next = NULL;
253 _count = c;
254 _profit = p;
255 _work = w;
256 _size = s;
257 _heat = 0;
258 }
260 public:
261 // Because WarmInfo objects live over the entire lifetime of the
262 // Compile object, they are allocated into the comp_arena, which
263 // does not get resource marked or reset during the compile process
264 void *operator new( size_t x, Compile* C ) throw() { return C->comp_arena()->Amalloc(x); }
265 void operator delete( void * ) { } // fast deallocation
267 static WarmCallInfo* always_hot();
268 static WarmCallInfo* always_cold();
270 WarmCallInfo() {
271 _call = NULL;
272 _hot_cg = NULL;
273 _next = NULL;
274 _count = _profit = _work = _size = _heat = 0;
275 }
277 CallNode* call() const { return _call; }
278 float count() const { return _count; }
279 float size() const { return _size; }
280 float work() const { return _work; }
281 float profit() const { return _profit; }
282 float heat() const { return _heat; }
284 void set_count(float x) { _count = x; }
285 void set_size(float x) { _size = x; }
286 void set_work(float x) { _work = x; }
287 void set_profit(float x) { _profit = x; }
288 void set_heat(float x) { _heat = x; }
290 // Load initial heuristics from profiles, etc.
291 // The heuristics can be tweaked further by the caller.
292 void init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor);
294 static float MAX_VALUE() { return +1.0e10; }
295 static float MIN_VALUE() { return -1.0e10; }
297 float compute_heat() const;
299 void set_call(CallNode* call) { _call = call; }
300 void set_hot_cg(CallGenerator* cg) { _hot_cg = cg; }
302 // Do not queue very hot or very cold calls.
303 // Make very cold ones out of line immediately.
304 // Inline very hot ones immediately.
305 // These queries apply various tunable limits
306 // to the above metrics in a systematic way.
307 // Test for coldness before testing for hotness.
308 bool is_cold() const;
309 bool is_hot() const;
311 // Force a warm call to be hot. This worklists the call node for inlining.
312 void make_hot();
314 // Force a warm call to be cold. This worklists the call node for out-of-lining.
315 void make_cold();
317 // A reproducible total ordering, in which heat is the major key.
318 bool warmer_than(WarmCallInfo* that);
320 // List management. These methods are called with the list head,
321 // and return the new list head, inserting or removing the receiver.
322 WarmCallInfo* insert_into(WarmCallInfo* head);
323 WarmCallInfo* remove_from(WarmCallInfo* head);
325 #ifndef PRODUCT
326 void print() const;
327 void print_all() const;
328 int count_all() const;
329 #endif
330 };
332 #endif // SHARE_VM_OPTO_CALLGENERATOR_HPP