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

 /*

  * Copyright (c) 2000, 2011, 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/ciCPCache.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"

 CallGenerator::CallGenerator(ciMethod* method) {

   _method = method;

 }

 // 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, tf()->domain()->cnt()) CallStaticJavaNode(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(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_invoke()) {

       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();

 }

 //---------------------------DynamicCallGenerator-----------------------------

 // Internal class which handles all out-of-line invokedynamic calls.

 class DynamicCallGenerator : public CallGenerator {

 public:

   DynamicCallGenerator(ciMethod* method)

     : CallGenerator(method)

   {

   }

   virtual JVMState* generate(JVMState* jvms);

 };

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

   GraphKit kit(jvms);

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

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

   }

   // Get the constant pool cache from the caller class.

   ciMethod* caller_method = jvms->method();

   ciBytecodeStream str(caller_method);

   str.force_bci(jvms->bci());  // Set the stream to the invokedynamic bci.

   assert(str.cur_bc() == Bytecodes::_invokedynamic, "wrong place to issue a dynamic call!");

   ciCPCache* cpcache = str.get_cpcache();

   // Get the offset of the CallSite from the constant pool cache

   // pointer.

   int index = str.get_method_index();

   size_t call_site_offset = cpcache->get_f1_offset(index);

   // Load the CallSite object from the constant pool cache.

   const TypeOopPtr* cpcache_ptr = TypeOopPtr::make_from_constant(cpcache);

   Node* cpcache_adr = kit.makecon(cpcache_ptr);

   Node* call_site_adr = kit.basic_plus_adr(cpcache_adr, cpcache_adr, call_site_offset);

   Node* call_site = kit.make_load(kit.control(), call_site_adr, TypeInstPtr::BOTTOM, T_OBJECT, Compile::AliasIdxRaw);

   // Load the target MethodHandle from the CallSite object.

   Node* target_mh_adr = kit.basic_plus_adr(call_site, call_site, java_lang_invoke_CallSite::target_offset_in_bytes());

   Node* target_mh = kit.make_load(kit.control(), target_mh_adr, TypeInstPtr::BOTTOM, T_OBJECT);

   address resolve_stub = SharedRuntime::get_resolve_opt_virtual_call_stub();

   CallStaticJavaNode *call = new (kit.C, tf()->domain()->cnt()) CallStaticJavaNode(tf(), resolve_stub, method(), kit.bci());

   // invokedynamic is treated as an optimized invokevirtual.

   call->set_optimized_virtual(true);

   // Take extra care (in the presence of argument motion) not to trash the SP:

   call->set_method_handle_invoke(true);

   // Pass the target MethodHandle as first argument and shift the

   // other arguments.

   call->init_req(0 + TypeFunc::Parms, target_mh);

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

   for (uint i = 1; i < nargs; i++) {

     Node* arg = kit.argument(i - 1);

     call->init_req(i + TypeFunc::Parms, arg);

   }

   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);

   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 == methodOopDesc::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)) {

     kit.inc_sp(method()->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 ||

        ((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(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 == methodOopDesc::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, tf()->domain()->cnt()) 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_invoke(), "should be a direct call");

   return new VirtualCallGenerator(m, vtable_index);

 }

 CallGenerator* CallGenerator::for_dynamic_call(ciMethod* m) {

   assert(m->is_method_handle_invoke() || m->is_method_handle_adapter(), "for_dynamic_call mismatch");

   return new DynamicCallGenerator(m);

 }

 // Allow inlining decisions to be delayed

 class LateInlineCallGenerator : public DirectCallGenerator {

   CallGenerator* _inline_cg;

  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();

   JVMState* generate(JVMState* jvms) {

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

     // parse is finished.

     Compile::current()->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);

   }

 };

 void LateInlineCallGenerator::do_late_inline() {

   // Can't inline it

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

       call_node()->in(0) == NULL || call_node()->in(0)->is_top())

     return;

   CallStaticJavaNode* call = call_node();

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

   Compile* C = Compile::current();

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

   uint size = call->req();

   SafePointNode* map = new (C, size) 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()) {

     map->set_req(TypeFunc::Memory, MergeMemNode::make(C, map->in(TypeFunc::Memory)));

   }

   // Make enough space for the expression stack and transfer the incoming arguments

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

   jvms->set_map(map);

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

   if (nargs > 0) {

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

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

     }

   }

   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->default_node_notes();

   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();

   }

   kit.replace_call(call, result);

 }

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

   return new LateInlineCallGenerator(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(method());

   if (kit.stopped()) {

     return kit.transfer_exceptions_into_jvms();

   }

   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;

   { 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();

   }

   // Finish the diamond.

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

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

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

   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(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();

 }

 //------------------------PredictedDynamicCallGenerator-----------------------

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

 class PredictedDynamicCallGenerator : public CallGenerator {

   ciMethodHandle* _predicted_method_handle;

   CallGenerator*  _if_missed;

   CallGenerator*  _if_hit;

   float           _hit_prob;

 public:

   PredictedDynamicCallGenerator(ciMethodHandle* predicted_method_handle,

                                 CallGenerator* if_missed,

                                 CallGenerator* if_hit,

                                 float hit_prob)

     : CallGenerator(if_missed->method()),

       _predicted_method_handle(predicted_method_handle),

       _if_missed(if_missed),

       _if_hit(if_hit),

       _hit_prob(hit_prob)

   {}

   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_dynamic_call(ciMethodHandle* predicted_method_handle,

                                                          CallGenerator* if_missed,

                                                          CallGenerator* if_hit,

                                                          float hit_prob) {

   return new PredictedDynamicCallGenerator(predicted_method_handle, if_missed, if_hit, hit_prob);

 }

 CallGenerator* CallGenerator::for_method_handle_call(Node* method_handle, JVMState* jvms,

                                                      ciMethod* caller, ciMethod* callee, ciCallProfile profile) {

   assert(callee->is_method_handle_invoke() || callee->is_method_handle_adapter(), "for_method_handle_call mismatch");

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

   if (cg != NULL)

     return cg;

   return CallGenerator::for_direct_call(callee);

 }

 CallGenerator* CallGenerator::for_method_handle_inline(Node* method_handle, JVMState* jvms,

                                                        ciMethod* caller, ciMethod* callee, ciCallProfile profile) {

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

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

     ciObject* const_oop = oop_ptr->const_oop();

     ciMethodHandle* method_handle = const_oop->as_method_handle();

     // Set the callee to have access to the class and signature in

     // the MethodHandleCompiler.

     method_handle->set_callee(callee);

     method_handle->set_caller(caller);

     method_handle->set_call_profile(profile);

     // Get an adapter for the MethodHandle.

     ciMethod* target_method = method_handle->get_method_handle_adapter();

     if (target_method != NULL) {

       CallGenerator* cg = Compile::current()->call_generator(target_method, -1, false, jvms, true, PROB_ALWAYS);

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

         return cg;

     }

   } else if (method_handle->Opcode() == Op_Phi && method_handle->req() == 3 &&

              method_handle->in(1)->Opcode() == Op_ConP && method_handle->in(2)->Opcode() == Op_ConP) {

     float prob = PROB_FAIR;

     Node* meth_region = method_handle->in(0);

     if (meth_region->is_Region() &&

         meth_region->in(1)->is_Proj() && meth_region->in(2)->is_Proj() &&

         meth_region->in(1)->in(0) == meth_region->in(2)->in(0) &&

         meth_region->in(1)->in(0)->is_If()) {

       // If diamond, so grab the probability of the test to drive the inlining below

       prob = meth_region->in(1)->in(0)->as_If()->_prob;

       if (meth_region->in(1)->is_IfTrue()) {

         prob = 1 - prob;

       }

     }

     // selectAlternative idiom merging two constant MethodHandles.

     // Generate a guard so that each can be inlined.  We might want to

     // do more inputs at later point but this gets the most common

     // case.

     CallGenerator* cg1 = for_method_handle_call(method_handle->in(1), jvms, caller, callee, profile.rescale(1.0 - prob));

     CallGenerator* cg2 = for_method_handle_call(method_handle->in(2), jvms, caller, callee, profile.rescale(prob));

     if (cg1 != NULL && cg2 != NULL) {

       const TypeOopPtr* oop_ptr = method_handle->in(1)->bottom_type()->is_oopptr();

       ciObject* const_oop = oop_ptr->const_oop();

       ciMethodHandle* mh = const_oop->as_method_handle();

       return new PredictedDynamicCallGenerator(mh, cg2, cg1, prob);

     }

   }

   return NULL;

 }

 CallGenerator* CallGenerator::for_invokedynamic_call(JVMState* jvms, ciMethod* caller, ciMethod* callee, ciCallProfile profile) {

   assert(callee->is_method_handle_invoke() || callee->is_method_handle_adapter(), "for_invokedynamic_call mismatch");

   // Get the CallSite object.

   ciBytecodeStream str(caller);

   str.force_bci(jvms->bci());  // Set the stream to the invokedynamic bci.

   ciCallSite* call_site = str.get_call_site();

   CallGenerator* cg = CallGenerator::for_invokedynamic_inline(call_site, jvms, caller, callee, profile);

   if (cg != NULL)

     return cg;

   return CallGenerator::for_dynamic_call(callee);

 }

 CallGenerator* CallGenerator::for_invokedynamic_inline(ciCallSite* call_site, JVMState* jvms,

                                                        ciMethod* caller, ciMethod* callee, ciCallProfile profile) {

   ciMethodHandle* method_handle = call_site->get_target();

   // Set the callee to have access to the class and signature in the

   // MethodHandleCompiler.

   method_handle->set_callee(callee);

   method_handle->set_caller(caller);

   method_handle->set_call_profile(profile);

   // Get an adapter for the MethodHandle.

   ciMethod* target_method = method_handle->get_invokedynamic_adapter();

   if (target_method != NULL) {

     Compile *C = Compile::current();

     CallGenerator* cg = C->call_generator(target_method, -1, false, jvms, true, PROB_ALWAYS);

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

       // Add a dependence for invalidation of the optimization.

       if (!call_site->is_constant_call_site()) {

         C->dependencies()->assert_call_site_target_value(call_site, method_handle);

       }

       return cg;

     }

   }

   return NULL;

 }

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

   GraphKit kit(jvms);

   PhaseGVN& gvn = kit.gvn();

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

   if (log != NULL) {

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

   }

   const TypeOopPtr* predicted_mh_ptr = TypeOopPtr::make_from_constant(_predicted_method_handle, true);

   Node* predicted_mh = kit.makecon(predicted_mh_ptr);

   Node* bol = NULL;

   int bc = jvms->method()->java_code_at_bci(jvms->bci());

   if (bc != Bytecodes::_invokedynamic) {

     // This is the selectAlternative idiom for guardWithTest or

     // similar idioms.

     Node* receiver = kit.argument(0);

     // Check if the MethodHandle is the expected one

     Node* cmp = gvn.transform(new(kit.C, 3) CmpPNode(receiver, predicted_mh));

     bol = gvn.transform(new(kit.C, 2) BoolNode(cmp, BoolTest::eq) );

   } else {

     // Get the constant pool cache from the caller class.

     ciMethod* caller_method = jvms->method();

     ciBytecodeStream str(caller_method);

     str.force_bci(jvms->bci());  // Set the stream to the invokedynamic bci.

     ciCPCache* cpcache = str.get_cpcache();

     // Get the offset of the CallSite from the constant pool cache

     // pointer.

     int index = str.get_method_index();

     size_t call_site_offset = cpcache->get_f1_offset(index);

     // Load the CallSite object from the constant pool cache.

     const TypeOopPtr* cpcache_ptr = TypeOopPtr::make_from_constant(cpcache);

     Node* cpcache_adr   = kit.makecon(cpcache_ptr);

     Node* call_site_adr = kit.basic_plus_adr(cpcache_adr, cpcache_adr, call_site_offset);

     Node* call_site     = kit.make_load(kit.control(), call_site_adr, TypeInstPtr::BOTTOM, T_OBJECT, Compile::AliasIdxRaw);

     // Load the target MethodHandle from the CallSite object.

     Node* target_adr = kit.basic_plus_adr(call_site, call_site, java_lang_invoke_CallSite::target_offset_in_bytes());

     Node* target_mh  = kit.make_load(kit.control(), target_adr, TypeInstPtr::BOTTOM, T_OBJECT);

     // Check if the MethodHandle is still the same.

     Node* cmp = gvn.transform(new(kit.C, 3) CmpPNode(target_mh, predicted_mh));

     bol = gvn.transform(new(kit.C, 2) BoolNode(cmp, BoolTest::eq) );

   }

   IfNode* iff = kit.create_and_xform_if(kit.control(), bol, _hit_prob, COUNT_UNKNOWN);

   kit.set_control( gvn.transform(new(kit.C, 1) IfTrueNode (iff)));

   Node* slow_ctl = gvn.transform(new(kit.C, 1) IfFalseNode(iff));

   SafePointNode* slow_map = NULL;

   JVMState* slow_jvms;

   { 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();

   }

   // 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();

   }

   // Finish the diamond.

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

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

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

   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(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();

 }

 //-------------------------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).

   int nargs = 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