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author | duke <none@none> | 2007-12-01 00:00:00 +0000 |
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committer | duke <none@none> | 2007-12-01 00:00:00 +0000 |
commit | fa6b5a8027b86d2f8a200e72b4ef6a0d3f9189d3 (patch) | |
tree | 8376f6e5c41e70162b5867d9e1fea3f17f540473 /src/share/vm/opto/callGenerator.hpp |
Initial loadjdk7-b24
Diffstat (limited to 'src/share/vm/opto/callGenerator.hpp')
-rw-r--r-- | src/share/vm/opto/callGenerator.hpp | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/src/share/vm/opto/callGenerator.hpp b/src/share/vm/opto/callGenerator.hpp new file mode 100644 index 000000000..bbd47ca4a --- /dev/null +++ b/src/share/vm/opto/callGenerator.hpp @@ -0,0 +1,266 @@ +/* + * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +//---------------------------CallGenerator------------------------------------- +// The subclasses of this class handle generation of ideal nodes for +// call sites and method entry points. + +class CallGenerator : public ResourceObj { + public: + enum { + xxxunusedxxx + }; + + private: + ciMethod* _method; // The method being called. + + protected: + CallGenerator(ciMethod* method); + + public: + // Accessors + ciMethod* method() const { return _method; } + + // is_inline: At least some code implementing the method is copied here. + virtual bool is_inline() const { return false; } + // is_intrinsic: There's a method-specific way of generating the inline code. + virtual bool is_intrinsic() const { return false; } + // is_parse: Bytecodes implementing the specific method are copied here. + virtual bool is_parse() const { return false; } + // is_virtual: The call uses the receiver type to select or check the method. + virtual bool is_virtual() const { return false; } + // is_deferred: The decision whether to inline or not is deferred. + virtual bool is_deferred() const { return false; } + // is_predicted: Uses an explicit check against a predicted type. + virtual bool is_predicted() const { return false; } + // is_trap: Does not return to the caller. (E.g., uncommon trap.) + virtual bool is_trap() const { return false; } + + // Note: It is possible for a CG to be both inline and virtual. + // (The hashCode intrinsic does a vtable check and an inlined fast path.) + + // Utilities: + const TypeFunc* tf() const; + + // The given jvms has state and arguments for a call to my method. + // Edges after jvms->argoff() carry all (pre-popped) argument values. + // + // Update the map with state and return values (if any) and return it. + // The return values (0, 1, or 2) must be pushed on the map's stack, + // and the sp of the jvms incremented accordingly. + // + // The jvms is returned on success. Alternatively, a copy of the + // given jvms, suitably updated, may be returned, in which case the + // caller should discard the original jvms. + // + // The non-Parm edges of the returned map will contain updated global state, + // and one or two edges before jvms->sp() will carry any return values. + // Other map edges may contain locals or monitors, and should not + // be changed in meaning. + // + // If the call traps, the returned map must have a control edge of top. + // If the call can throw, the returned map must report has_exceptions(). + // + // If the result is NULL, it means that this CallGenerator was unable + // to handle the given call, and another CallGenerator should be consulted. + virtual JVMState* generate(JVMState* jvms) = 0; + + // How to generate a call site that is inlined: + static CallGenerator* for_inline(ciMethod* m, float expected_uses = -1); + // How to generate code for an on-stack replacement handler. + static CallGenerator* for_osr(ciMethod* m, int osr_bci); + + // How to generate vanilla out-of-line call sites: + static CallGenerator* for_direct_call(ciMethod* m); // static, special + static CallGenerator* for_virtual_call(ciMethod* m, int vtable_index); // virtual, interface + + // How to make a call but defer the decision whether to inline or not. + static CallGenerator* for_warm_call(WarmCallInfo* ci, + CallGenerator* if_cold, + CallGenerator* if_hot); + + // How to make a call that optimistically assumes a receiver type: + static CallGenerator* for_predicted_call(ciKlass* predicted_receiver, + CallGenerator* if_missed, + CallGenerator* if_hit, + float hit_prob); + + // How to make a call that gives up and goes back to the interpreter: + static CallGenerator* for_uncommon_trap(ciMethod* m, + Deoptimization::DeoptReason reason, + Deoptimization::DeoptAction action); + + // Registry for intrinsics: + static CallGenerator* for_intrinsic(ciMethod* m); + static void register_intrinsic(ciMethod* m, CallGenerator* cg); +}; + +class InlineCallGenerator : public CallGenerator { + virtual bool is_inline() const { return true; } + + protected: + InlineCallGenerator(ciMethod* method) : CallGenerator(method) { } +}; + + +//---------------------------WarmCallInfo-------------------------------------- +// A struct to collect information about a given call site. +// Helps sort call sites into "hot", "medium", and "cold". +// Participates in the queueing of "medium" call sites for possible inlining. +class WarmCallInfo : public ResourceObj { + private: + + CallNode* _call; // The CallNode which may be inlined. + CallGenerator* _hot_cg;// CG for expanding the call node + + // These are the metrics we use to evaluate call sites: + + float _count; // How often do we expect to reach this site? + float _profit; // How much time do we expect to save by inlining? + float _work; // How long do we expect the average call to take? + float _size; // How big do we expect the inlined code to be? + + float _heat; // Combined score inducing total order on call sites. + WarmCallInfo* _next; // Next cooler call info in pending queue. + + // Count is the number of times this call site is expected to be executed. + // Large count is favorable for inlining, because the extra compilation + // work will be amortized more completely. + + // Profit is a rough measure of the amount of time we expect to save + // per execution of this site if we inline it. (1.0 == call overhead) + // Large profit favors inlining. Negative profit disables inlining. + + // Work is a rough measure of the amount of time a typical out-of-line + // call from this site is expected to take. (1.0 == call, no-op, return) + // Small work is somewhat favorable for inlining, since methods with + // short "hot" traces are more likely to inline smoothly. + + // Size is the number of graph nodes we expect this method to produce, + // not counting the inlining of any further warm calls it may include. + // Small size favors inlining, since small methods are more likely to + // inline smoothly. The size is estimated by examining the native code + // if available. The method bytecodes are also examined, assuming + // empirically observed node counts for each kind of bytecode. + + // Heat is the combined "goodness" of a site's inlining. If we were + // omniscient, it would be the difference of two sums of future execution + // times of code emitted for this site (amortized across multiple sites if + // sharing applies). The two sums are for versions of this call site with + // and without inlining. + + // We approximate this mythical quantity by playing with averages, + // rough estimates, and assumptions that history repeats itself. + // The basic formula count * profit is heuristically adjusted + // by looking at the expected compilation and execution times of + // of the inlined call. + + // Note: Some of these metrics may not be present in the final product, + // but exist in development builds to experiment with inline policy tuning. + + // This heuristic framework does not model well the very significant + // effects of multiple-level inlining. It is possible to see no immediate + // profit from inlining X->Y, but to get great profit from a subsequent + // inlining X->Y->Z. + + // This framework does not take well into account the problem of N**2 code + // size in a clique of mutually inlinable methods. + + WarmCallInfo* next() const { return _next; } + void set_next(WarmCallInfo* n) { _next = n; } + + static WarmCallInfo* _always_hot; + static WarmCallInfo* _always_cold; + + public: + // Because WarmInfo objects live over the entire lifetime of the + // Compile object, they are allocated into the comp_arena, which + // does not get resource marked or reset during the compile process + void *operator new( size_t x, Compile* C ) { return C->comp_arena()->Amalloc(x); } + void operator delete( void * ) { } // fast deallocation + + static WarmCallInfo* always_hot(); + static WarmCallInfo* always_cold(); + + WarmCallInfo() { + _call = NULL; + _hot_cg = NULL; + _next = NULL; + _count = _profit = _work = _size = _heat = 0; + } + + CallNode* call() const { return _call; } + float count() const { return _count; } + float size() const { return _size; } + float work() const { return _work; } + float profit() const { return _profit; } + float heat() const { return _heat; } + + void set_count(float x) { _count = x; } + void set_size(float x) { _size = x; } + void set_work(float x) { _work = x; } + void set_profit(float x) { _profit = x; } + void set_heat(float x) { _heat = x; } + + // Load initial heuristics from profiles, etc. + // The heuristics can be tweaked further by the caller. + void init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor); + + static float MAX_VALUE() { return +1.0e10; } + static float MIN_VALUE() { return -1.0e10; } + + float compute_heat() const; + + void set_call(CallNode* call) { _call = call; } + void set_hot_cg(CallGenerator* cg) { _hot_cg = cg; } + + // Do not queue very hot or very cold calls. + // Make very cold ones out of line immediately. + // Inline very hot ones immediately. + // These queries apply various tunable limits + // to the above metrics in a systematic way. + // Test for coldness before testing for hotness. + bool is_cold() const; + bool is_hot() const; + + // Force a warm call to be hot. This worklists the call node for inlining. + void make_hot(); + + // Force a warm call to be cold. This worklists the call node for out-of-lining. + void make_cold(); + + // A reproducible total ordering, in which heat is the major key. + bool warmer_than(WarmCallInfo* that); + + // List management. These methods are called with the list head, + // and return the new list head, inserting or removing the receiver. + WarmCallInfo* insert_into(WarmCallInfo* head); + WarmCallInfo* remove_from(WarmCallInfo* head); + +#ifndef PRODUCT + void print() const; + void print_all() const; + int count_all() const; +#endif +}; |