Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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.

  *

  */

 #include "precompiled.hpp"

 #include "ci/bcEscapeAnalyzer.hpp"

 #include "ci/ciCallSite.hpp"

 #include "ci/ciObjArray.hpp"

 #include "ci/ciMemberName.hpp"

 #include "ci/ciMethodHandle.hpp"

 #include "classfile/javaClasses.hpp"

 #include "compiler/compileLog.hpp"

 #include "opto/addnode.hpp"

 #include "opto/callGenerator.hpp"

 #include "opto/callnode.hpp"

 #include "opto/cfgnode.hpp"

 #include "opto/connode.hpp"

 #include "opto/parse.hpp"

 #include "opto/rootnode.hpp"

 #include "opto/runtime.hpp"

 #include "opto/subnode.hpp"

 // Utility function.

 const TypeFunc* CallGenerator::tf() const {

   return TypeFunc::make(method());

 }

 //-----------------------------ParseGenerator---------------------------------

 // Internal class which handles all direct bytecode traversal.

 class ParseGenerator : public InlineCallGenerator {

 private:

   bool  _is_osr;

   float _expected_uses;

 public:

   ParseGenerator(ciMethod* method, float expected_uses, bool is_osr = false)

     : InlineCallGenerator(method)

   {

     _is_osr        = is_osr;

     _expected_uses = expected_uses;

     assert(InlineTree::check_can_parse(method) == NULL, "parse must be possible");

   }

   virtual bool      is_parse() const           { return true; }

   virtual JVMState* generate(JVMState* jvms);

   int is_osr() { return _is_osr; }

 };

 JVMState* ParseGenerator::generate(JVMState* jvms) {

   Compile* C = Compile::current();

   if (is_osr()) {

     // The JVMS for a OSR has a single argument (see its TypeFunc).

     assert(jvms->depth() == 1, "no inline OSR");

   }

   if (C->failing()) {

     return NULL;  // bailing out of the compile; do not try to parse

   }

   Parse parser(jvms, method(), _expected_uses);

   // Grab signature for matching/allocation

 #ifdef ASSERT

   if (parser.tf() != (parser.depth() == 1 ? C->tf() : tf())) {

     MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);

     assert(C->env()->system_dictionary_modification_counter_changed(),

            "Must invalidate if TypeFuncs differ");

   }

 #endif

   GraphKit& exits = parser.exits();

   if (C->failing()) {

     while (exits.pop_exception_state() != NULL) ;

     return NULL;

   }

   assert(exits.jvms()->same_calls_as(jvms), "sanity");

   // Simply return the exit state of the parser,

   // augmented by any exceptional states.

   return exits.transfer_exceptions_into_jvms();

 }

 //---------------------------DirectCallGenerator------------------------------

 // Internal class which handles all out-of-line calls w/o receiver type checks.

 class DirectCallGenerator : public CallGenerator {

  private:

   CallStaticJavaNode* _call_node;

   // Force separate memory and I/O projections for the exceptional

   // paths to facilitate late inlinig.

   bool                _separate_io_proj;

  public:

   DirectCallGenerator(ciMethod* method, bool separate_io_proj)

     : CallGenerator(method),

       _separate_io_proj(separate_io_proj)

   {

   }

   virtual JVMState* generate(JVMState* jvms);

   CallStaticJavaNode* call_node() const { return _call_node; }

 };

 JVMState* DirectCallGenerator::generate(JVMState* jvms) {

   GraphKit kit(jvms);

   bool is_static = method()->is_static();

   address target = is_static ? SharedRuntime::get_resolve_static_call_stub()

                              : SharedRuntime::get_resolve_opt_virtual_call_stub();

   if (kit.C->log() != NULL) {

     kit.C->log()->elem("direct_call bci='%d'", jvms->bci());

   }

   CallStaticJavaNode *call = new (kit.C) CallStaticJavaNode(kit.C, tf(), target, method(), kit.bci());

   _call_node = call;  // Save the call node in case we need it later

   if (!is_static) {

     // Make an explicit receiver null_check as part of this call.

     // Since we share a map with the caller, his JVMS gets adjusted.

     kit.null_check_receiver_before_call(method());

     if (kit.stopped()) {

       // And dump it back to the caller, decorated with any exceptions:

       return kit.transfer_exceptions_into_jvms();

     }

     // Mark the call node as virtual, sort of:

     call->set_optimized_virtual(true);

     if (method()->is_method_handle_intrinsic() ||

         method()->is_compiled_lambda_form()) {

       call->set_method_handle_invoke(true);

     }

   }

   kit.set_arguments_for_java_call(call);

   kit.set_edges_for_java_call(call, false, _separate_io_proj);

   Node* ret = kit.set_results_for_java_call(call, _separate_io_proj);

   kit.push_node(method()->return_type()->basic_type(), ret);

   return kit.transfer_exceptions_into_jvms();

 }

 //--------------------------VirtualCallGenerator------------------------------

 // Internal class which handles all out-of-line calls checking receiver type.

 class VirtualCallGenerator : public CallGenerator {

 private:

   int _vtable_index;

 public:

   VirtualCallGenerator(ciMethod* method, int vtable_index)

     : CallGenerator(method), _vtable_index(vtable_index)

   {

     assert(vtable_index == Method::invalid_vtable_index ||

            vtable_index >= 0, "either invalid or usable");

   }

   virtual bool      is_virtual() const          { return true; }

   virtual JVMState* generate(JVMState* jvms);

 };

 JVMState* VirtualCallGenerator::generate(JVMState* jvms) {

   GraphKit kit(jvms);

   Node* receiver = kit.argument(0);

   if (kit.C->log() != NULL) {

     kit.C->log()->elem("virtual_call bci='%d'", jvms->bci());

   }

   // If the receiver is a constant null, do not torture the system

   // by attempting to call through it.  The compile will proceed

   // correctly, but may bail out in final_graph_reshaping, because

   // the call instruction will have a seemingly deficient out-count.

   // (The bailout says something misleading about an "infinite loop".)

   if (kit.gvn().type(receiver)->higher_equal(TypePtr::NULL_PTR)) {

     assert(Bytecodes::is_invoke(kit.java_bc()), err_msg("%d: %s", kit.java_bc(), Bytecodes::name(kit.java_bc())));

     ciMethod* declared_method = kit.method()->get_method_at_bci(kit.bci());

     int arg_size = declared_method->signature()->arg_size_for_bc(kit.java_bc());

     kit.inc_sp(arg_size);  // restore arguments

     kit.uncommon_trap(Deoptimization::Reason_null_check,

                       Deoptimization::Action_none,

                       NULL, "null receiver");

     return kit.transfer_exceptions_into_jvms();

   }

   // Ideally we would unconditionally do a null check here and let it

   // be converted to an implicit check based on profile information.

   // However currently the conversion to implicit null checks in

   // Block::implicit_null_check() only looks for loads and stores, not calls.

   ciMethod *caller = kit.method();

   ciMethodData *caller_md = (caller == NULL) ? NULL : caller->method_data();

   if (!UseInlineCaches || !ImplicitNullChecks || !os::zero_page_read_protected() ||

        ((ImplicitNullCheckThreshold > 0) && caller_md &&

        (caller_md->trap_count(Deoptimization::Reason_null_check)

        >= (uint)ImplicitNullCheckThreshold))) {

     // Make an explicit receiver null_check as part of this call.

     // Since we share a map with the caller, his JVMS gets adjusted.

     receiver = kit.null_check_receiver_before_call(method());

     if (kit.stopped()) {

       // And dump it back to the caller, decorated with any exceptions:

       return kit.transfer_exceptions_into_jvms();

     }

   }

   assert(!method()->is_static(), "virtual call must not be to static");

   assert(!method()->is_final(), "virtual call should not be to final");

   assert(!method()->is_private(), "virtual call should not be to private");

   assert(_vtable_index == Method::invalid_vtable_index || !UseInlineCaches,

          "no vtable calls if +UseInlineCaches ");

   address target = SharedRuntime::get_resolve_virtual_call_stub();

   // Normal inline cache used for call

   CallDynamicJavaNode *call = new (kit.C) CallDynamicJavaNode(tf(), target, method(), _vtable_index, kit.bci());

   kit.set_arguments_for_java_call(call);

   kit.set_edges_for_java_call(call);

   Node* ret = kit.set_results_for_java_call(call);

   kit.push_node(method()->return_type()->basic_type(), ret);

   // Represent the effect of an implicit receiver null_check

   // as part of this call.  Since we share a map with the caller,

   // his JVMS gets adjusted.

   kit.cast_not_null(receiver);

   return kit.transfer_exceptions_into_jvms();

 }

 CallGenerator* CallGenerator::for_inline(ciMethod* m, float expected_uses) {

   if (InlineTree::check_can_parse(m) != NULL)  return NULL;

   return new ParseGenerator(m, expected_uses);

 }

 // As a special case, the JVMS passed to this CallGenerator is

 // for the method execution already in progress, not just the JVMS

 // of the caller.  Thus, this CallGenerator cannot be mixed with others!

 CallGenerator* CallGenerator::for_osr(ciMethod* m, int osr_bci) {

   if (InlineTree::check_can_parse(m) != NULL)  return NULL;

   float past_uses = m->interpreter_invocation_count();

   float expected_uses = past_uses;

   return new ParseGenerator(m, expected_uses, true);

 }

 CallGenerator* CallGenerator::for_direct_call(ciMethod* m, bool separate_io_proj) {

   assert(!m->is_abstract(), "for_direct_call mismatch");

   return new DirectCallGenerator(m, separate_io_proj);

 }

 CallGenerator* CallGenerator::for_virtual_call(ciMethod* m, int vtable_index) {

   assert(!m->is_static(), "for_virtual_call mismatch");

   assert(!m->is_method_handle_intrinsic(), "should be a direct call");

   return new VirtualCallGenerator(m, vtable_index);

 }

 // Allow inlining decisions to be delayed

 class LateInlineCallGenerator : public DirectCallGenerator {

  protected:

   CallGenerator* _inline_cg;

   virtual bool do_late_inline_check(JVMState* jvms) { return true; }

  public:

   LateInlineCallGenerator(ciMethod* method, CallGenerator* inline_cg) :

     DirectCallGenerator(method, true), _inline_cg(inline_cg) {}

   virtual bool      is_late_inline() const { return true; }

   // Convert the CallStaticJava into an inline

   virtual void do_late_inline();

   virtual JVMState* generate(JVMState* jvms) {

     Compile *C = Compile::current();

     C->print_inlining_skip(this);

     // Record that this call site should be revisited once the main

     // parse is finished.

     if (!is_mh_late_inline()) {

       C->add_late_inline(this);

     }

     // Emit the CallStaticJava and request separate projections so

     // that the late inlining logic can distinguish between fall

     // through and exceptional uses of the memory and io projections

     // as is done for allocations and macro expansion.

     return DirectCallGenerator::generate(jvms);

   }

   virtual void print_inlining_late(const char* msg) {

     CallNode* call = call_node();

     Compile* C = Compile::current();

     C->print_inlining_insert(this);

     C->print_inlining(method(), call->jvms()->depth()-1, call->jvms()->bci(), msg);

   }

 };

 void LateInlineCallGenerator::do_late_inline() {

   // Can't inline it

   CallStaticJavaNode* call = call_node();

   if (call == NULL || call->outcnt() == 0 ||

       call->in(0) == NULL || call->in(0)->is_top()) {

     return;

   }

   const TypeTuple *r = call->tf()->domain();

   for (int i1 = 0; i1 < method()->arg_size(); i1++) {

     if (call->in(TypeFunc::Parms + i1)->is_top() && r->field_at(TypeFunc::Parms + i1) != Type::HALF) {

       assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");

       return;

     }

   }

   if (call->in(TypeFunc::Memory)->is_top()) {

     assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");

     return;

   }

   Compile* C = Compile::current();

   // Remove inlined methods from Compiler's lists.

   if (call->is_macro()) {

     C->remove_macro_node(call);

   }

   // Make a clone of the JVMState that appropriate to use for driving a parse

   JVMState* old_jvms = call->jvms();

   JVMState* jvms = old_jvms->clone_shallow(C);

   uint size = call->req();

   SafePointNode* map = new (C) SafePointNode(size, jvms);

   for (uint i1 = 0; i1 < size; i1++) {

     map->init_req(i1, call->in(i1));

   }

   // Make sure the state is a MergeMem for parsing.

   if (!map->in(TypeFunc::Memory)->is_MergeMem()) {

     Node* mem = MergeMemNode::make(C, map->in(TypeFunc::Memory));

     C->initial_gvn()->set_type_bottom(mem);

     map->set_req(TypeFunc::Memory, mem);

   }

   uint nargs = method()->arg_size();

   // blow away old call arguments

   Node* top = C->top();

   for (uint i1 = 0; i1 < nargs; i1++) {

     map->set_req(TypeFunc::Parms + i1, top);

   }

   jvms->set_map(map);

   // Make enough space in the expression stack to transfer

   // the incoming arguments and return value.

   map->ensure_stack(jvms, jvms->method()->max_stack());

   for (uint i1 = 0; i1 < nargs; i1++) {

     map->set_argument(jvms, i1, call->in(TypeFunc::Parms + i1));

   }

   // This check is done here because for_method_handle_inline() method

   // needs jvms for inlined state.

   if (!do_late_inline_check(jvms)) {

     map->disconnect_inputs(NULL, C);

     return;

   }

   C->print_inlining_insert(this);

   CompileLog* log = C->log();

   if (log != NULL) {

     log->head("late_inline method='%d'", log->identify(method()));

     JVMState* p = jvms;

     while (p != NULL) {

       log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));

       p = p->caller();

     }

     log->tail("late_inline");

   }

   // Setup default node notes to be picked up by the inlining

   Node_Notes* old_nn = C->node_notes_at(call->_idx);

   if (old_nn != NULL) {

     Node_Notes* entry_nn = old_nn->clone(C);

     entry_nn->set_jvms(jvms);

     C->set_default_node_notes(entry_nn);

   }

   // Now perform the inling using the synthesized JVMState

   JVMState* new_jvms = _inline_cg->generate(jvms);

   if (new_jvms == NULL)  return;  // no change

   if (C->failing())      return;

   // Capture any exceptional control flow

   GraphKit kit(new_jvms);

   // Find the result object

   Node* result = C->top();

   int   result_size = method()->return_type()->size();

   if (result_size != 0 && !kit.stopped()) {

     result = (result_size == 1) ? kit.pop() : kit.pop_pair();

   }

   C->set_has_loops(C->has_loops() || _inline_cg->method()->has_loops());

   C->env()->notice_inlined_method(_inline_cg->method());

   C->set_inlining_progress(true);

   kit.replace_call(call, result, true);

 }

 CallGenerator* CallGenerator::for_late_inline(ciMethod* method, CallGenerator* inline_cg) {

   return new LateInlineCallGenerator(method, inline_cg);

 }

 class LateInlineMHCallGenerator : public LateInlineCallGenerator {

   ciMethod* _caller;

   int _attempt;

   bool _input_not_const;

   virtual bool do_late_inline_check(JVMState* jvms);

   virtual bool already_attempted() const { return _attempt > 0; }

  public:

   LateInlineMHCallGenerator(ciMethod* caller, ciMethod* callee, bool input_not_const) :

     LateInlineCallGenerator(callee, NULL), _caller(caller), _attempt(0), _input_not_const(input_not_const) {}

   virtual bool is_mh_late_inline() const { return true; }

   virtual JVMState* generate(JVMState* jvms) {

     JVMState* new_jvms = LateInlineCallGenerator::generate(jvms);

     if (_input_not_const) {

       // inlining won't be possible so no need to enqueue right now.

       call_node()->set_generator(this);

     } else {

       Compile::current()->add_late_inline(this);

     }

     return new_jvms;

   }

   virtual void print_inlining_late(const char* msg) {

     if (!_input_not_const) return;

     LateInlineCallGenerator::print_inlining_late(msg);

   }

 };

 bool LateInlineMHCallGenerator::do_late_inline_check(JVMState* jvms) {

   CallGenerator* cg = for_method_handle_inline(jvms, _caller, method(), _input_not_const);

   if (!_input_not_const) {

     _attempt++;

   }

   if (cg != NULL) {

     assert(!cg->is_late_inline() && cg->is_inline(), "we're doing late inlining");

     _inline_cg = cg;

     Compile::current()->dec_number_of_mh_late_inlines();

     return true;

   }

   call_node()->set_generator(this);

   return false;

 }

 CallGenerator* CallGenerator::for_mh_late_inline(ciMethod* caller, ciMethod* callee, bool input_not_const) {

   Compile::current()->inc_number_of_mh_late_inlines();

   CallGenerator* cg = new LateInlineMHCallGenerator(caller, callee, input_not_const);

   return cg;

 }

 class LateInlineStringCallGenerator : public LateInlineCallGenerator {

  public:

   LateInlineStringCallGenerator(ciMethod* method, CallGenerator* inline_cg) :

     LateInlineCallGenerator(method, inline_cg) {}

   virtual JVMState* generate(JVMState* jvms) {

     Compile *C = Compile::current();

     C->print_inlining_skip(this);

     C->add_string_late_inline(this);

     JVMState* new_jvms =  DirectCallGenerator::generate(jvms);

     return new_jvms;

   }

   virtual bool is_string_late_inline() const { return true; }

 };

 CallGenerator* CallGenerator::for_string_late_inline(ciMethod* method, CallGenerator* inline_cg) {

   return new LateInlineStringCallGenerator(method, inline_cg);

 }

 class LateInlineBoxingCallGenerator : public LateInlineCallGenerator {

  public:

   LateInlineBoxingCallGenerator(ciMethod* method, CallGenerator* inline_cg) :

     LateInlineCallGenerator(method, inline_cg) {}

   virtual JVMState* generate(JVMState* jvms) {

     Compile *C = Compile::current();

     C->print_inlining_skip(this);

     C->add_boxing_late_inline(this);

     JVMState* new_jvms =  DirectCallGenerator::generate(jvms);

     return new_jvms;

   }

 };

 CallGenerator* CallGenerator::for_boxing_late_inline(ciMethod* method, CallGenerator* inline_cg) {

   return new LateInlineBoxingCallGenerator(method, inline_cg);

 }

 //---------------------------WarmCallGenerator--------------------------------

 // Internal class which handles initial deferral of inlining decisions.

 class WarmCallGenerator : public CallGenerator {

   WarmCallInfo*   _call_info;

   CallGenerator*  _if_cold;

   CallGenerator*  _if_hot;

   bool            _is_virtual;   // caches virtuality of if_cold

   bool            _is_inline;    // caches inline-ness of if_hot

 public:

   WarmCallGenerator(WarmCallInfo* ci,

                     CallGenerator* if_cold,

                     CallGenerator* if_hot)

     : CallGenerator(if_cold->method())

   {

     assert(method() == if_hot->method(), "consistent choices");

     _call_info  = ci;

     _if_cold    = if_cold;

     _if_hot     = if_hot;

     _is_virtual = if_cold->is_virtual();

     _is_inline  = if_hot->is_inline();

   }

   virtual bool      is_inline() const           { return _is_inline; }

   virtual bool      is_virtual() const          { return _is_virtual; }

   virtual bool      is_deferred() const         { return true; }

   virtual JVMState* generate(JVMState* jvms);

 };

 CallGenerator* CallGenerator::for_warm_call(WarmCallInfo* ci,

                                             CallGenerator* if_cold,

                                             CallGenerator* if_hot) {

   return new WarmCallGenerator(ci, if_cold, if_hot);

 }

 JVMState* WarmCallGenerator::generate(JVMState* jvms) {

   Compile* C = Compile::current();

   if (C->log() != NULL) {

     C->log()->elem("warm_call bci='%d'", jvms->bci());

   }

   jvms = _if_cold->generate(jvms);

   if (jvms != NULL) {

     Node* m = jvms->map()->control();

     if (m->is_CatchProj()) m = m->in(0);  else m = C->top();

     if (m->is_Catch())     m = m->in(0);  else m = C->top();

     if (m->is_Proj())      m = m->in(0);  else m = C->top();

     if (m->is_CallJava()) {

       _call_info->set_call(m->as_Call());

       _call_info->set_hot_cg(_if_hot);

 #ifndef PRODUCT

       if (PrintOpto || PrintOptoInlining) {

         tty->print_cr("Queueing for warm inlining at bci %d:", jvms->bci());

         tty->print("WCI: ");

         _call_info->print();

       }

 #endif

       _call_info->set_heat(_call_info->compute_heat());

       C->set_warm_calls(_call_info->insert_into(C->warm_calls()));

     }

   }

   return jvms;

 }

 void WarmCallInfo::make_hot() {

   Unimplemented();

 }

 void WarmCallInfo::make_cold() {

   // No action:  Just dequeue.

 }

 //------------------------PredictedCallGenerator------------------------------

 // Internal class which handles all out-of-line calls checking receiver type.

 class PredictedCallGenerator : public CallGenerator {

   ciKlass*       _predicted_receiver;

   CallGenerator* _if_missed;

   CallGenerator* _if_hit;

   float          _hit_prob;

 public:

   PredictedCallGenerator(ciKlass* predicted_receiver,

                          CallGenerator* if_missed,

                          CallGenerator* if_hit, float hit_prob)

     : CallGenerator(if_missed->method())

   {

     // The call profile data may predict the hit_prob as extreme as 0 or 1.

     // Remove the extremes values from the range.

     if (hit_prob > PROB_MAX)   hit_prob = PROB_MAX;

     if (hit_prob < PROB_MIN)   hit_prob = PROB_MIN;

     _predicted_receiver = predicted_receiver;

     _if_missed          = if_missed;

     _if_hit             = if_hit;

     _hit_prob           = hit_prob;

   }

   virtual bool      is_virtual()   const    { return true; }

   virtual bool      is_inline()    const    { return _if_hit->is_inline(); }

   virtual bool      is_deferred()  const    { return _if_hit->is_deferred(); }

   virtual JVMState* generate(JVMState* jvms);

 };

 CallGenerator* CallGenerator::for_predicted_call(ciKlass* predicted_receiver,

                                                  CallGenerator* if_missed,

                                                  CallGenerator* if_hit,

                                                  float hit_prob) {

   return new PredictedCallGenerator(predicted_receiver, if_missed, if_hit, hit_prob);

 }

 JVMState* PredictedCallGenerator::generate(JVMState* jvms) {

   GraphKit kit(jvms);

   PhaseGVN& gvn = kit.gvn();

   // We need an explicit receiver null_check before checking its type.

   // We share a map with the caller, so his JVMS gets adjusted.

   Node* receiver = kit.argument(0);

   CompileLog* log = kit.C->log();

   if (log != NULL) {

     log->elem("predicted_call bci='%d' klass='%d'",

               jvms->bci(), log->identify(_predicted_receiver));

   }

   receiver = kit.null_check_receiver_before_call(method());

   if (kit.stopped()) {

     return kit.transfer_exceptions_into_jvms();

   }

   // Make a copy of the replaced nodes in case we need to restore them

   ReplacedNodes replaced_nodes = kit.map()->replaced_nodes();

   replaced_nodes.clone();

   Node* exact_receiver = receiver;  // will get updated in place...

   Node* slow_ctl = kit.type_check_receiver(receiver,

                                            _predicted_receiver, _hit_prob,

                                            &exact_receiver);

   SafePointNode* slow_map = NULL;

   JVMState* slow_jvms = NULL;

   { PreserveJVMState pjvms(&kit);

     kit.set_control(slow_ctl);

     if (!kit.stopped()) {

       slow_jvms = _if_missed->generate(kit.sync_jvms());

       if (kit.failing())

         return NULL;  // might happen because of NodeCountInliningCutoff

       assert(slow_jvms != NULL, "must be");

       kit.add_exception_states_from(slow_jvms);

       kit.set_map(slow_jvms->map());

       if (!kit.stopped())

         slow_map = kit.stop();

     }

   }

   if (kit.stopped()) {

     // Instance exactly does not matches the desired type.

     kit.set_jvms(slow_jvms);

     return kit.transfer_exceptions_into_jvms();

   }

   // fall through if the instance exactly matches the desired type

   kit.replace_in_map(receiver, exact_receiver);

   // Make the hot call:

   JVMState* new_jvms = _if_hit->generate(kit.sync_jvms());

   if (new_jvms == NULL) {

     // Inline failed, so make a direct call.

     assert(_if_hit->is_inline(), "must have been a failed inline");

     CallGenerator* cg = CallGenerator::for_direct_call(_if_hit->method());

     new_jvms = cg->generate(kit.sync_jvms());

   }

   kit.add_exception_states_from(new_jvms);

   kit.set_jvms(new_jvms);

   // Need to merge slow and fast?

   if (slow_map == NULL) {

     // The fast path is the only path remaining.

     return kit.transfer_exceptions_into_jvms();

   }

   if (kit.stopped()) {

     // Inlined method threw an exception, so it's just the slow path after all.

     kit.set_jvms(slow_jvms);

     return kit.transfer_exceptions_into_jvms();

   }

   // There are 2 branches and the replaced nodes are only valid on

   // one: restore the replaced nodes to what they were before the

   // branch.

   kit.map()->set_replaced_nodes(replaced_nodes);

   // Finish the diamond.

   kit.C->set_has_split_ifs(true); // Has chance for split-if optimization

   RegionNode* region = new (kit.C) RegionNode(3);

   region->init_req(1, kit.control());

   region->init_req(2, slow_map->control());

   kit.set_control(gvn.transform(region));

   Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);

   iophi->set_req(2, slow_map->i_o());

   kit.set_i_o(gvn.transform(iophi));

   // Merge memory

   kit.merge_memory(slow_map->merged_memory(), region, 2);

   // Transform new memory Phis.

   for (MergeMemStream mms(kit.merged_memory()); mms.next_non_empty();) {

     Node* phi = mms.memory();

     if (phi->is_Phi() && phi->in(0) == region) {

       mms.set_memory(gvn.transform(phi));

     }

   }

   uint tos = kit.jvms()->stkoff() + kit.sp();

   uint limit = slow_map->req();

   for (uint i = TypeFunc::Parms; i < limit; i++) {

     // Skip unused stack slots; fast forward to monoff();

     if (i == tos) {

       i = kit.jvms()->monoff();

       if( i >= limit ) break;

     }

     Node* m = kit.map()->in(i);

     Node* n = slow_map->in(i);

     if (m != n) {

       const Type* t = gvn.type(m)->meet_speculative(gvn.type(n));

       Node* phi = PhiNode::make(region, m, t);

       phi->set_req(2, n);

       kit.map()->set_req(i, gvn.transform(phi));

     }

   }

   return kit.transfer_exceptions_into_jvms();

 }

 CallGenerator* CallGenerator::for_method_handle_call(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool delayed_forbidden) {

   assert(callee->is_method_handle_intrinsic() ||

          callee->is_compiled_lambda_form(), "for_method_handle_call mismatch");

   bool input_not_const;

   CallGenerator* cg = CallGenerator::for_method_handle_inline(jvms, caller, callee, input_not_const);

   Compile* C = Compile::current();

   if (cg != NULL) {

     if (!delayed_forbidden && AlwaysIncrementalInline) {

       return CallGenerator::for_late_inline(callee, cg);

     } else {

       return cg;

     }

   }

   int bci = jvms->bci();

   ciCallProfile profile = caller->call_profile_at_bci(bci);

   int call_site_count = caller->scale_count(profile.count());

   if (IncrementalInline && call_site_count > 0 &&

       (input_not_const || !C->inlining_incrementally() || C->over_inlining_cutoff())) {

     return CallGenerator::for_mh_late_inline(caller, callee, input_not_const);

   } else {

     // Out-of-line call.

     return CallGenerator::for_direct_call(callee);

   }

 }

 CallGenerator* CallGenerator::for_method_handle_inline(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool& input_not_const) {

   GraphKit kit(jvms);

   PhaseGVN& gvn = kit.gvn();

   Compile* C = kit.C;

   vmIntrinsics::ID iid = callee->intrinsic_id();

   input_not_const = true;

   switch (iid) {

   case vmIntrinsics::_invokeBasic:

     {

       // Get MethodHandle receiver:

       Node* receiver = kit.argument(0);

       if (receiver->Opcode() == Op_ConP) {

         input_not_const = false;

         const TypeOopPtr* oop_ptr = receiver->bottom_type()->is_oopptr();

         ciMethod* target = oop_ptr->const_oop()->as_method_handle()->get_vmtarget();

         guarantee(!target->is_method_handle_intrinsic(), "should not happen");  // XXX remove

         const int vtable_index = Method::invalid_vtable_index;

         CallGenerator* cg = C->call_generator(target, vtable_index, false, jvms, true, PROB_ALWAYS, NULL, true, true);

         assert(cg == NULL || !cg->is_late_inline() || cg->is_mh_late_inline(), "no late inline here");

         if (cg != NULL && cg->is_inline())

           return cg;

       }

     }

     break;

   case vmIntrinsics::_linkToVirtual:

   case vmIntrinsics::_linkToStatic:

   case vmIntrinsics::_linkToSpecial:

   case vmIntrinsics::_linkToInterface:

     {

       // Get MemberName argument:

       Node* member_name = kit.argument(callee->arg_size() - 1);

       if (member_name->Opcode() == Op_ConP) {

         input_not_const = false;

         const TypeOopPtr* oop_ptr = member_name->bottom_type()->is_oopptr();

         ciMethod* target = oop_ptr->const_oop()->as_member_name()->get_vmtarget();

         // In lamda forms we erase signature types to avoid resolving issues

         // involving class loaders.  When we optimize a method handle invoke

         // to a direct call we must cast the receiver and arguments to its

         // actual types.

         ciSignature* signature = target->signature();

         const int receiver_skip = target->is_static() ? 0 : 1;

         // Cast receiver to its type.

         if (!target->is_static()) {

           Node* arg = kit.argument(0);

           const TypeOopPtr* arg_type = arg->bottom_type()->isa_oopptr();

           const Type*       sig_type = TypeOopPtr::make_from_klass(signature->accessing_klass());

           if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {

             Node* cast_obj = gvn.transform(new (C) CheckCastPPNode(kit.control(), arg, sig_type));

             kit.set_argument(0, cast_obj);

           }

         }

         // Cast reference arguments to its type.

         for (int i = 0, j = 0; i < signature->count(); i++) {

           ciType* t = signature->type_at(i);

           if (t->is_klass()) {

             Node* arg = kit.argument(receiver_skip + j);

             const TypeOopPtr* arg_type = arg->bottom_type()->isa_oopptr();

             const Type*       sig_type = TypeOopPtr::make_from_klass(t->as_klass());

             if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {

               Node* cast_obj = gvn.transform(new (C) CheckCastPPNode(kit.control(), arg, sig_type));

               kit.set_argument(receiver_skip + j, cast_obj);

             }

           }

           j += t->size();  // long and double take two slots

         }

         // Try to get the most accurate receiver type

         const bool is_virtual              = (iid == vmIntrinsics::_linkToVirtual);

         const bool is_virtual_or_interface = (is_virtual || iid == vmIntrinsics::_linkToInterface);

         int  vtable_index       = Method::invalid_vtable_index;

         bool call_does_dispatch = false;

         ciKlass* speculative_receiver_type = NULL;

         if (is_virtual_or_interface) {

           ciInstanceKlass* klass = target->holder();

           Node*             receiver_node = kit.argument(0);

           const TypeOopPtr* receiver_type = gvn.type(receiver_node)->isa_oopptr();

           // call_does_dispatch and vtable_index are out-parameters.  They might be changed.

           // optimize_virtual_call() takes 2 different holder

           // arguments for a corner case that doesn't apply here (see

           // Parse::do_call())

           target = C->optimize_virtual_call(caller, jvms->bci(), klass, klass,

                                             target, receiver_type, is_virtual,

                                             call_does_dispatch, vtable_index, // out-parameters

                                             /*check_access=*/false);

           // We lack profiling at this call but type speculation may

           // provide us with a type

           speculative_receiver_type = (receiver_type != NULL) ? receiver_type->speculative_type() : NULL;

         }

         CallGenerator* cg = C->call_generator(target, vtable_index, call_does_dispatch, jvms, true, PROB_ALWAYS, speculative_receiver_type, true, true);

         assert(cg == NULL || !cg->is_late_inline() || cg->is_mh_late_inline(), "no late inline here");

         if (cg != NULL && cg->is_inline())

           return cg;

       }

     }

     break;

   default:

     fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));

     break;

   }

   return NULL;

 }

 //------------------------PredicatedIntrinsicGenerator------------------------------

 // Internal class which handles all predicated Intrinsic calls.

 class PredicatedIntrinsicGenerator : public CallGenerator {

   CallGenerator* _intrinsic;

   CallGenerator* _cg;

 public:

   PredicatedIntrinsicGenerator(CallGenerator* intrinsic,

                                CallGenerator* cg)

     : CallGenerator(cg->method())

   {

     _intrinsic = intrinsic;

     _cg        = cg;

   }

   virtual bool      is_virtual()   const    { return true; }

   virtual bool      is_inlined()   const    { return true; }

   virtual bool      is_intrinsic() const    { return true; }

   virtual JVMState* generate(JVMState* jvms);

 };

 CallGenerator* CallGenerator::for_predicated_intrinsic(CallGenerator* intrinsic,

                                                        CallGenerator* cg) {

   return new PredicatedIntrinsicGenerator(intrinsic, cg);

 }

 JVMState* PredicatedIntrinsicGenerator::generate(JVMState* jvms) {

   // The code we want to generate here is:

   //    if (receiver == NULL)

   //        uncommon_Trap

   //    if (predicate(0))

   //        do_intrinsic(0)

   //    else

   //    if (predicate(1))

   //        do_intrinsic(1)

   //    ...

   //    else

   //        do_java_comp

   GraphKit kit(jvms);

   PhaseGVN& gvn = kit.gvn();

   CompileLog* log = kit.C->log();

   if (log != NULL) {

     log->elem("predicated_intrinsic bci='%d' method='%d'",

               jvms->bci(), log->identify(method()));

   }

   if (!method()->is_static()) {

     // We need an explicit receiver null_check before checking its type in predicate.

     // We share a map with the caller, so his JVMS gets adjusted.

     Node* receiver = kit.null_check_receiver_before_call(method());

     if (kit.stopped()) {

       return kit.transfer_exceptions_into_jvms();

     }

   }

   int n_predicates = _intrinsic->predicates_count();

   assert(n_predicates > 0, "sanity");

   JVMState** result_jvms = NEW_RESOURCE_ARRAY(JVMState*, (n_predicates+1));

   // Region for normal compilation code if intrinsic failed.

   Node* slow_region = new (kit.C) RegionNode(1);

   int results = 0;

   for (int predicate = 0; (predicate < n_predicates) && !kit.stopped(); predicate++) {

 #ifdef ASSERT

     JVMState* old_jvms = kit.jvms();

     SafePointNode* old_map = kit.map();

     Node* old_io  = old_map->i_o();

     Node* old_mem = old_map->memory();

     Node* old_exc = old_map->next_exception();

 #endif

     Node* else_ctrl = _intrinsic->generate_predicate(kit.sync_jvms(), predicate);

 #ifdef ASSERT

     // Assert(no_new_memory && no_new_io && no_new_exceptions) after generate_predicate.

     assert(old_jvms == kit.jvms(), "generate_predicate should not change jvm state");

     SafePointNode* new_map = kit.map();

     assert(old_io  == new_map->i_o(), "generate_predicate should not change i_o");

     assert(old_mem == new_map->memory(), "generate_predicate should not change memory");

     assert(old_exc == new_map->next_exception(), "generate_predicate should not add exceptions");

 #endif

     if (!kit.stopped()) {

       PreserveJVMState pjvms(&kit);

       // Generate intrinsic code:

       JVMState* new_jvms = _intrinsic->generate(kit.sync_jvms());

       if (new_jvms == NULL) {

         // Intrinsic failed, use normal compilation path for this predicate.

         slow_region->add_req(kit.control());

       } else {

         kit.add_exception_states_from(new_jvms);

         kit.set_jvms(new_jvms);

         if (!kit.stopped()) {

           result_jvms[results++] = kit.jvms();

         }

       }

     }

     if (else_ctrl == NULL) {

       else_ctrl = kit.C->top();

     }

     kit.set_control(else_ctrl);

   }

   if (!kit.stopped()) {

     // Final 'else' after predicates.

     slow_region->add_req(kit.control());

   }

   if (slow_region->req() > 1) {

     PreserveJVMState pjvms(&kit);

     // Generate normal compilation code:

     kit.set_control(gvn.transform(slow_region));

     JVMState* new_jvms = _cg->generate(kit.sync_jvms());

     if (kit.failing())

       return NULL;  // might happen because of NodeCountInliningCutoff

     assert(new_jvms != NULL, "must be");

     kit.add_exception_states_from(new_jvms);

     kit.set_jvms(new_jvms);

     if (!kit.stopped()) {

       result_jvms[results++] = kit.jvms();

     }

   }

   if (results == 0) {

     // All paths ended in uncommon traps.

     (void) kit.stop();

     return kit.transfer_exceptions_into_jvms();

   }

   if (results == 1) { // Only one path

     kit.set_jvms(result_jvms[0]);

     return kit.transfer_exceptions_into_jvms();

   }

   // Merge all paths.

   kit.C->set_has_split_ifs(true); // Has chance for split-if optimization

   RegionNode* region = new (kit.C) RegionNode(results + 1);

   Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);

   for (int i = 0; i < results; i++) {

     JVMState* jvms = result_jvms[i];

     int path = i + 1;

     SafePointNode* map = jvms->map();

     region->init_req(path, map->control());

     iophi->set_req(path, map->i_o());

     if (i == 0) {

       kit.set_jvms(jvms);

     } else {

       kit.merge_memory(map->merged_memory(), region, path);

     }

   }

   kit.set_control(gvn.transform(region));

   kit.set_i_o(gvn.transform(iophi));

   // Transform new memory Phis.

   for (MergeMemStream mms(kit.merged_memory()); mms.next_non_empty();) {

     Node* phi = mms.memory();

     if (phi->is_Phi() && phi->in(0) == region) {

       mms.set_memory(gvn.transform(phi));

     }

   }

   // Merge debug info.

   Node** ins = NEW_RESOURCE_ARRAY(Node*, results);

   uint tos = kit.jvms()->stkoff() + kit.sp();

   Node* map = kit.map();

   uint limit = map->req();

   for (uint i = TypeFunc::Parms; i < limit; i++) {

     // Skip unused stack slots; fast forward to monoff();

     if (i == tos) {

       i = kit.jvms()->monoff();

       if( i >= limit ) break;

     }

     Node* n = map->in(i);

     ins[0] = n;

     const Type* t = gvn.type(n);

     bool needs_phi = false;

     for (int j = 1; j < results; j++) {

       JVMState* jvms = result_jvms[j];

       Node* jmap = jvms->map();

       Node* m = NULL;

       if (jmap->req() > i) {

         m = jmap->in(i);

         if (m != n) {

           needs_phi = true;

           t = t->meet_speculative(gvn.type(m));

         }

       }

       ins[j] = m;

     }

     if (needs_phi) {

       Node* phi = PhiNode::make(region, n, t);

       for (int j = 1; j < results; j++) {

         phi->set_req(j + 1, ins[j]);

       }

       map->set_req(i, gvn.transform(phi));

     }

   }

   return kit.transfer_exceptions_into_jvms();

 }

 //-------------------------UncommonTrapCallGenerator-----------------------------

 // Internal class which handles all out-of-line calls checking receiver type.

 class UncommonTrapCallGenerator : public CallGenerator {

   Deoptimization::DeoptReason _reason;

   Deoptimization::DeoptAction _action;

 public:

   UncommonTrapCallGenerator(ciMethod* m,

                             Deoptimization::DeoptReason reason,

                             Deoptimization::DeoptAction action)

     : CallGenerator(m)

   {

     _reason = reason;

     _action = action;

   }

   virtual bool      is_virtual() const          { ShouldNotReachHere(); return false; }

   virtual bool      is_trap() const             { return true; }

   virtual JVMState* generate(JVMState* jvms);

 };

 CallGenerator*

 CallGenerator::for_uncommon_trap(ciMethod* m,

                                  Deoptimization::DeoptReason reason,

                                  Deoptimization::DeoptAction action) {

   return new UncommonTrapCallGenerator(m, reason, action);

 }

 JVMState* UncommonTrapCallGenerator::generate(JVMState* jvms) {

   GraphKit kit(jvms);

   // Take the trap with arguments pushed on the stack.  (Cf. null_check_receiver).

   // Callsite signature can be different from actual method being called (i.e _linkTo* sites).

   // Use callsite signature always.

   ciMethod* declared_method = kit.method()->get_method_at_bci(kit.bci());

   int nargs = declared_method->arg_size();

   kit.inc_sp(nargs);

   assert(nargs <= kit.sp() && kit.sp() <= jvms->stk_size(), "sane sp w/ args pushed");

   if (_reason == Deoptimization::Reason_class_check &&

       _action == Deoptimization::Action_maybe_recompile) {

     // Temp fix for 6529811

     // Don't allow uncommon_trap to override our decision to recompile in the event

     // of a class cast failure for a monomorphic call as it will never let us convert

     // the call to either bi-morphic or megamorphic and can lead to unc-trap loops

     bool keep_exact_action = true;

     kit.uncommon_trap(_reason, _action, NULL, "monomorphic vcall checkcast", false, keep_exact_action);

   } else {

     kit.uncommon_trap(_reason, _action);

   }

   return kit.transfer_exceptions_into_jvms();

 }

 // (Note:  Moved hook_up_call to GraphKit::set_edges_for_java_call.)

 // (Node:  Merged hook_up_exits into ParseGenerator::generate.)

 #define NODES_OVERHEAD_PER_METHOD (30.0)

 #define NODES_PER_BYTECODE (9.5)

 void WarmCallInfo::init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor) {

   int call_count = profile.count();

   int code_size = call_method->code_size();

   // Expected execution count is based on the historical count:

   _count = call_count < 0 ? 1 : call_site->method()->scale_count(call_count, prof_factor);

   // Expected profit from inlining, in units of simple call-overheads.

   _profit = 1.0;

   // Expected work performed by the call in units of call-overheads.

   // %%% need an empirical curve fit for "work" (time in call)

   float bytecodes_per_call = 3;

   _work = 1.0 + code_size / bytecodes_per_call;

   // Expected size of compilation graph:

   // -XX:+PrintParseStatistics once reported:

   //  Methods seen: 9184  Methods parsed: 9184  Nodes created: 1582391

   //  Histogram of 144298 parsed bytecodes:

   // %%% Need an better predictor for graph size.

   _size = NODES_OVERHEAD_PER_METHOD + (NODES_PER_BYTECODE * code_size);

 }

 // is_cold:  Return true if the node should never be inlined.

 // This is true if any of the key metrics are extreme.

 bool WarmCallInfo::is_cold() const {

   if (count()  <  WarmCallMinCount)        return true;

   if (profit() <  WarmCallMinProfit)       return true;

   if (work()   >  WarmCallMaxWork)         return true;

   if (size()   >  WarmCallMaxSize)         return true;

   return false;

 }

 // is_hot:  Return true if the node should be inlined immediately.

 // This is true if any of the key metrics are extreme.

 bool WarmCallInfo::is_hot() const {

   assert(!is_cold(), "eliminate is_cold cases before testing is_hot");

   if (count()  >= HotCallCountThreshold)   return true;

   if (profit() >= HotCallProfitThreshold)  return true;

   if (work()   <= HotCallTrivialWork)      return true;

   if (size()   <= HotCallTrivialSize)      return true;

   return false;

 }

 // compute_heat:

 float WarmCallInfo::compute_heat() const {

   assert(!is_cold(), "compute heat only on warm nodes");

   assert(!is_hot(),  "compute heat only on warm nodes");

   int min_size = MAX2(0,   (int)HotCallTrivialSize);

   int max_size = MIN2(500, (int)WarmCallMaxSize);

   float method_size = (size() - min_size) / MAX2(1, max_size - min_size);

   float size_factor;

   if      (method_size < 0.05)  size_factor = 4;   // 2 sigmas better than avg.

   else if (method_size < 0.15)  size_factor = 2;   // 1 sigma better than avg.

   else if (method_size < 0.5)   size_factor = 1;   // better than avg.

   else                          size_factor = 0.5; // worse than avg.

   return (count() * profit() * size_factor);

 }

 bool WarmCallInfo::warmer_than(WarmCallInfo* that) {

   assert(this != that, "compare only different WCIs");

   assert(this->heat() != 0 && that->heat() != 0, "call compute_heat 1st");

   if (this->heat() > that->heat())   return true;

   if (this->heat() < that->heat())   return false;

   assert(this->heat() == that->heat(), "no NaN heat allowed");

   // Equal heat.  Break the tie some other way.

   if (!this->call() || !that->call())  return (address)this > (address)that;

   return this->call()->_idx > that->call()->_idx;

 }

 //#define UNINIT_NEXT ((WarmCallInfo*)badAddress)

 #define UNINIT_NEXT ((WarmCallInfo*)NULL)

 WarmCallInfo* WarmCallInfo::insert_into(WarmCallInfo* head) {

   assert(next() == UNINIT_NEXT, "not yet on any list");

   WarmCallInfo* prev_p = NULL;

   WarmCallInfo* next_p = head;

   while (next_p != NULL && next_p->warmer_than(this)) {

     prev_p = next_p;

     next_p = prev_p->next();

   }

   // Install this between prev_p and next_p.

   this->set_next(next_p);

   if (prev_p == NULL)

     head = this;

   else

     prev_p->set_next(this);

   return head;

 }

 WarmCallInfo* WarmCallInfo::remove_from(WarmCallInfo* head) {

   WarmCallInfo* prev_p = NULL;

   WarmCallInfo* next_p = head;

   while (next_p != this) {

     assert(next_p != NULL, "this must be in the list somewhere");

     prev_p = next_p;

     next_p = prev_p->next();

   }

   next_p = this->next();

   debug_only(this->set_next(UNINIT_NEXT));

   // Remove this from between prev_p and next_p.

   if (prev_p == NULL)

     head = next_p;

   else

     prev_p->set_next(next_p);

   return head;

 }

 WarmCallInfo WarmCallInfo::_always_hot(WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE(),

                                        WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE());

 WarmCallInfo WarmCallInfo::_always_cold(WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE(),

                                         WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE());

 WarmCallInfo* WarmCallInfo::always_hot() {

   assert(_always_hot.is_hot(), "must always be hot");

   return &_always_hot;

 }

 WarmCallInfo* WarmCallInfo::always_cold() {

   assert(_always_cold.is_cold(), "must always be cold");

   return &_always_cold;

 }

 #ifndef PRODUCT

 void WarmCallInfo::print() const {

   tty->print("%s : C=%6.1f P=%6.1f W=%6.1f S=%6.1f H=%6.1f -> %p",

              is_cold() ? "cold" : is_hot() ? "hot " : "warm",

              count(), profit(), work(), size(), compute_heat(), next());

   tty->cr();

   if (call() != NULL)  call()->dump();

 }

 void print_wci(WarmCallInfo* ci) {

   ci->print();

 }

 void WarmCallInfo::print_all() const {

   for (const WarmCallInfo* p = this; p != NULL; p = p->next())

     p->print();

 }

 int WarmCallInfo::count_all() const {

   int cnt = 0;

   for (const WarmCallInfo* p = this; p != NULL; p = p->next())

     cnt++;

   return cnt;

 }

 #endif //PRODUCT