jdk8-mips64-public/hotspot: src/share/vm/opto/callGenerator.hpp@29bdcf12457c (annotated)

src/share/vm/opto/callGenerator.hpp@29bdcf12457c (annotated)

src/share/vm/opto/callGenerator.hpp

Fri, 27 Sep 2013 11:52:24 +0400

author: shade
date: Fri, 27 Sep 2013 11:52:24 +0400
changeset 5798: 29bdcf12457c
parent 5763: 1b64d46620a3
child 5981: 3213ba4d3dff
permissions: -rw-r--r--

8014447: Object.hashCode intrinsic breaks inline caches
Summary: Try to inline as normal method first, then fall back to intrinsic.
Reviewed-by: kvn, twisti

 /*
  * Copyright (c) 2000, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_OPTO_CALLGENERATOR_HPP
 #define SHARE_VM_OPTO_CALLGENERATOR_HPP
 #include "compiler/compileBroker.hpp"
 #include "opto/callnode.hpp"
 #include "opto/compile.hpp"
 #include "opto/type.hpp"
 #include "runtime/deoptimization.hpp"
 //---------------------------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) : _method(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; }
   // does_virtual_dispatch: Should try inlining as normal method first.
   virtual bool      does_virtual_dispatch() const     { return false; }
   // is_late_inline: supports conversion of call into an inline
   virtual bool      is_late_inline() const      { return false; }
   // same but for method handle calls
   virtual bool      is_mh_late_inline() const   { return false; }
   // for method handle calls: have we tried inlinining the call already?
   virtual bool      already_attempted() const   { ShouldNotReachHere(); return false; }
   // Replace the call with an inline version of the code
   virtual void do_late_inline() { ShouldNotReachHere(); }
   virtual CallStaticJavaNode* call_node() const { ShouldNotReachHere(); return NULL; }
   // 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, bool separate_io_projs = false);   // static, special
   static CallGenerator* for_virtual_call(ciMethod* m, int vtable_index);  // virtual, interface
   static CallGenerator* for_dynamic_call(ciMethod* m);   // invokedynamic
   static CallGenerator* for_method_handle_call(  JVMState* jvms, ciMethod* caller, ciMethod* callee, bool delayed_forbidden);
   static CallGenerator* for_method_handle_inline(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool& input_not_const);
   // How to generate a replace a direct call with an inline version
   static CallGenerator* for_late_inline(ciMethod* m, CallGenerator* inline_cg);
   static CallGenerator* for_mh_late_inline(ciMethod* caller, ciMethod* callee, bool input_not_const);
   static CallGenerator* for_string_late_inline(ciMethod* m, CallGenerator* inline_cg);
   static CallGenerator* for_boxing_late_inline(ciMethod* m, CallGenerator* inline_cg);
   // 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 optimistically assumes a MethodHandle target:
   static CallGenerator* for_predicted_dynamic_call(ciMethodHandle* predicted_method_handle,
                                                    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);
   static CallGenerator* for_predicted_intrinsic(CallGenerator* intrinsic,
                                                 CallGenerator* cg);
   virtual Node* generate_predicate(JVMState* jvms) { return NULL; };
   virtual void print_inlining_late(const char* msg) { ShouldNotReachHere(); }
   static void print_inlining(Compile* C, ciMethod* callee, int inline_level, int bci, const char* msg) {
     if (C->print_inlining()) {
       C->print_inlining(callee, inline_level, bci, msg);
     }
   }
 };
 //------------------------InlineCallGenerator----------------------------------
 class InlineCallGenerator : public CallGenerator {
  protected:
   InlineCallGenerator(ciMethod* method) : CallGenerator(method) {}
  public:
   virtual bool      is_inline() const           { return true; }
 };
 //---------------------------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;
   // Constructor intitialization of always_hot and always_cold
   WarmCallInfo(float c, float p, float w, float s) {
     _call = NULL;
     _hot_cg = NULL;
     _next = NULL;
     _count = c;
     _profit = p;
     _work = w;
     _size = s;
     _heat = 0;
   }
  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 ) throw() { 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
 };
 #endif // SHARE_VM_OPTO_CALLGENERATOR_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/callGenerator.hpp@29bdcf12457c (annotated)

src/share/vm/opto/callGenerator.hpp