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

 /*

  * Copyright 2005-2007 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_macro.cpp.incl"

 //

 // Replace any references to "oldref" in inputs to "use" with "newref".

 // Returns the number of replacements made.

 //

 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {

   int nreplacements = 0;

   uint req = use->req();

   for (uint j = 0; j < use->len(); j++) {

     Node *uin = use->in(j);

     if (uin == oldref) {

       if (j < req)

         use->set_req(j, newref);

       else

         use->set_prec(j, newref);

       nreplacements++;

     } else if (j >= req && uin == NULL) {

       break;

     }

   }

   return nreplacements;

 }

 void PhaseMacroExpand::copy_call_debug_info(CallNode *oldcall, CallNode * newcall) {

   // Copy debug information and adjust JVMState information

   uint old_dbg_start = oldcall->tf()->domain()->cnt();

   uint new_dbg_start = newcall->tf()->domain()->cnt();

   int jvms_adj  = new_dbg_start - old_dbg_start;

   assert (new_dbg_start == newcall->req(), "argument count mismatch");

   for (uint i = old_dbg_start; i < oldcall->req(); i++) {

     newcall->add_req(oldcall->in(i));

   }

   newcall->set_jvms(oldcall->jvms());

   for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) {

     jvms->set_map(newcall);

     jvms->set_locoff(jvms->locoff()+jvms_adj);

     jvms->set_stkoff(jvms->stkoff()+jvms_adj);

     jvms->set_monoff(jvms->monoff()+jvms_adj);

     jvms->set_endoff(jvms->endoff()+jvms_adj);

   }

 }

 Node* PhaseMacroExpand::opt_iff(Node* region, Node* iff) {

   IfNode *opt_iff = transform_later(iff)->as_If();

   // Fast path taken; set region slot 2

   Node *fast_taken = transform_later( new (C, 1) IfFalseNode(opt_iff) );

   region->init_req(2,fast_taken); // Capture fast-control

   // Fast path not-taken, i.e. slow path

   Node *slow_taken = transform_later( new (C, 1) IfTrueNode(opt_iff) );

   return slow_taken;

 }

 //--------------------copy_predefined_input_for_runtime_call--------------------

 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) {

   // Set fixed predefined input arguments

   call->init_req( TypeFunc::Control, ctrl );

   call->init_req( TypeFunc::I_O    , oldcall->in( TypeFunc::I_O) );

   call->init_req( TypeFunc::Memory , oldcall->in( TypeFunc::Memory ) ); // ?????

   call->init_req( TypeFunc::ReturnAdr, oldcall->in( TypeFunc::ReturnAdr ) );

   call->init_req( TypeFunc::FramePtr, oldcall->in( TypeFunc::FramePtr ) );

 }

 //------------------------------make_slow_call---------------------------------

 CallNode* PhaseMacroExpand::make_slow_call(CallNode *oldcall, const TypeFunc* slow_call_type, address slow_call, const char* leaf_name, Node* slow_path, Node* parm0, Node* parm1) {

   // Slow-path call

   int size = slow_call_type->domain()->cnt();

  CallNode *call = leaf_name

    ? (CallNode*)new (C, size) CallLeafNode      ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )

    : (CallNode*)new (C, size) CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM );

   // Slow path call has no side-effects, uses few values

   copy_predefined_input_for_runtime_call(slow_path, oldcall, call );

   if (parm0 != NULL)  call->init_req(TypeFunc::Parms+0, parm0);

   if (parm1 != NULL)  call->init_req(TypeFunc::Parms+1, parm1);

   copy_call_debug_info(oldcall, call);

   call->set_cnt(PROB_UNLIKELY_MAG(4));  // Same effect as RC_UNCOMMON.

   _igvn.hash_delete(oldcall);

   _igvn.subsume_node(oldcall, call);

   transform_later(call);

   return call;

 }

 void PhaseMacroExpand::extract_call_projections(CallNode *call) {

   _fallthroughproj = NULL;

   _fallthroughcatchproj = NULL;

   _ioproj_fallthrough = NULL;

   _ioproj_catchall = NULL;

   _catchallcatchproj = NULL;

   _memproj_fallthrough = NULL;

   _memproj_catchall = NULL;

   _resproj = NULL;

   for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) {

     ProjNode *pn = call->fast_out(i)->as_Proj();

     switch (pn->_con) {

       case TypeFunc::Control:

       {

         // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj

         _fallthroughproj = pn;

         DUIterator_Fast jmax, j = pn->fast_outs(jmax);

         const Node *cn = pn->fast_out(j);

         if (cn->is_Catch()) {

           ProjNode *cpn = NULL;

           for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) {

             cpn = cn->fast_out(k)->as_Proj();

             assert(cpn->is_CatchProj(), "must be a CatchProjNode");

             if (cpn->_con == CatchProjNode::fall_through_index)

               _fallthroughcatchproj = cpn;

             else {

               assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index.");

               _catchallcatchproj = cpn;

             }

           }

         }

         break;

       }

       case TypeFunc::I_O:

         if (pn->_is_io_use)

           _ioproj_catchall = pn;

         else

           _ioproj_fallthrough = pn;

         break;

       case TypeFunc::Memory:

         if (pn->_is_io_use)

           _memproj_catchall = pn;

         else

           _memproj_fallthrough = pn;

         break;

       case TypeFunc::Parms:

         _resproj = pn;

         break;

       default:

         assert(false, "unexpected projection from allocation node.");

     }

   }

 }

 //---------------------------set_eden_pointers-------------------------

 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) {

   if (UseTLAB) {                // Private allocation: load from TLS

     Node* thread = transform_later(new (C, 1) ThreadLocalNode());

     int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset());

     int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset());

     eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset);

     eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset);

   } else {                      // Shared allocation: load from globals

     CollectedHeap* ch = Universe::heap();

     address top_adr = (address)ch->top_addr();

     address end_adr = (address)ch->end_addr();

     eden_top_adr = makecon(TypeRawPtr::make(top_adr));

     eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr);

   }

 }

 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) {

   Node* adr = basic_plus_adr(base, offset);

   const TypePtr* adr_type = TypeRawPtr::BOTTOM;

   Node* value = LoadNode::make(C, ctl, mem, adr, adr_type, value_type, bt);

   transform_later(value);

   return value;

 }

 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) {

   Node* adr = basic_plus_adr(base, offset);

   mem = StoreNode::make(C, ctl, mem, adr, NULL, value, bt);

   transform_later(mem);

   return mem;

 }

 //=============================================================================

 //

 //                              A L L O C A T I O N

 //

 // Allocation attempts to be fast in the case of frequent small objects.

 // It breaks down like this:

 //

 // 1) Size in doublewords is computed.  This is a constant for objects and

 // variable for most arrays.  Doubleword units are used to avoid size

 // overflow of huge doubleword arrays.  We need doublewords in the end for

 // rounding.

 //

 // 2) Size is checked for being 'too large'.  Too-large allocations will go

 // the slow path into the VM.  The slow path can throw any required

 // exceptions, and does all the special checks for very large arrays.  The

 // size test can constant-fold away for objects.  For objects with

 // finalizers it constant-folds the otherway: you always go slow with

 // finalizers.

 //

 // 3) If NOT using TLABs, this is the contended loop-back point.

 // Load-Locked the heap top.  If using TLABs normal-load the heap top.

 //

 // 4) Check that heap top + size*8 < max.  If we fail go the slow ` route.

 // NOTE: "top+size*8" cannot wrap the 4Gig line!  Here's why: for largish

 // "size*8" we always enter the VM, where "largish" is a constant picked small

 // enough that there's always space between the eden max and 4Gig (old space is

 // there so it's quite large) and large enough that the cost of entering the VM

 // is dwarfed by the cost to initialize the space.

 //

 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back

 // down.  If contended, repeat at step 3.  If using TLABs normal-store

 // adjusted heap top back down; there is no contention.

 //

 // 6) If !ZeroTLAB then Bulk-clear the object/array.  Fill in klass & mark

 // fields.

 //

 // 7) Merge with the slow-path; cast the raw memory pointer to the correct

 // oop flavor.

 //

 //=============================================================================

 // FastAllocateSizeLimit value is in DOUBLEWORDS.

 // Allocations bigger than this always go the slow route.

 // This value must be small enough that allocation attempts that need to

 // trigger exceptions go the slow route.  Also, it must be small enough so

 // that heap_top + size_in_bytes does not wrap around the 4Gig limit.

 //=============================================================================j//

 // %%% Here is an old comment from parseHelper.cpp; is it outdated?

 // The allocator will coalesce int->oop copies away.  See comment in

 // coalesce.cpp about how this works.  It depends critically on the exact

 // code shape produced here, so if you are changing this code shape

 // make sure the GC info for the heap-top is correct in and around the

 // slow-path call.

 //

 void PhaseMacroExpand::expand_allocate_common(

             AllocateNode* alloc, // allocation node to be expanded

             Node* length,  // array length for an array allocation

             const TypeFunc* slow_call_type, // Type of slow call

             address slow_call_address  // Address of slow call

     )

 {

   Node* ctrl = alloc->in(TypeFunc::Control);

   Node* mem  = alloc->in(TypeFunc::Memory);

   Node* i_o  = alloc->in(TypeFunc::I_O);

   Node* size_in_bytes     = alloc->in(AllocateNode::AllocSize);

   Node* klass_node        = alloc->in(AllocateNode::KlassNode);

   Node* initial_slow_test = alloc->in(AllocateNode::InitialTest);

   Node* eden_top_adr;

   Node* eden_end_adr;

   set_eden_pointers(eden_top_adr, eden_end_adr);

   uint raw_idx = C->get_alias_index(TypeRawPtr::BOTTOM);

   assert(ctrl != NULL, "must have control");

   // Load Eden::end.  Loop invariant and hoisted.

   //

   // Note: We set the control input on "eden_end" and "old_eden_top" when using

   //       a TLAB to work around a bug where these values were being moved across

   //       a safepoint.  These are not oops, so they cannot be include in the oop

   //       map, but the can be changed by a GC.   The proper way to fix this would

   //       be to set the raw memory state when generating a  SafepointNode.  However

   //       this will require extensive changes to the loop optimization in order to

   //       prevent a degradation of the optimization.

   //       See comment in memnode.hpp, around line 227 in class LoadPNode.

   Node* eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS);

   // We need a Region and corresponding Phi's to merge the slow-path and fast-path results.

   // they will not be used if "always_slow" is set

   enum { slow_result_path = 1, fast_result_path = 2 };

   Node *result_region;

   Node *result_phi_rawmem;

   Node *result_phi_rawoop;

   Node *result_phi_i_o;

   // The initial slow comparison is a size check, the comparison

   // we want to do is a BoolTest::gt

   bool always_slow = false;

   int tv = _igvn.find_int_con(initial_slow_test, -1);

   if (tv >= 0) {

     always_slow = (tv == 1);

     initial_slow_test = NULL;

   } else {

     initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn);

   }

   if (DTraceAllocProbes) {

     // Force slow-path allocation

     always_slow = true;

     initial_slow_test = NULL;

   }

   enum { too_big_or_final_path = 1, need_gc_path = 2 };

   Node *slow_region = NULL;

   Node *toobig_false = ctrl;

   assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent");

   // generate the initial test if necessary

   if (initial_slow_test != NULL ) {

     slow_region = new (C, 3) RegionNode(3);

     // Now make the initial failure test.  Usually a too-big test but

     // might be a TRUE for finalizers or a fancy class check for

     // newInstance0.

     IfNode *toobig_iff = new (C, 2) IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);

     transform_later(toobig_iff);

     // Plug the failing-too-big test into the slow-path region

     Node *toobig_true = new (C, 1) IfTrueNode( toobig_iff );

     transform_later(toobig_true);

     slow_region    ->init_req( too_big_or_final_path, toobig_true );

     toobig_false = new (C, 1) IfFalseNode( toobig_iff );

     transform_later(toobig_false);

   } else {         // No initial test, just fall into next case

     toobig_false = ctrl;

     debug_only(slow_region = NodeSentinel);

   }

   Node *slow_mem = mem;  // save the current memory state for slow path

   // generate the fast allocation code unless we know that the initial test will always go slow

   if (!always_slow) {

     // allocate the Region and Phi nodes for the result

     result_region = new (C, 3) RegionNode(3);

     result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM );

     result_phi_rawoop = new (C, 3) PhiNode( result_region, TypeRawPtr::BOTTOM );

     result_phi_i_o    = new (C, 3) PhiNode( result_region, Type::ABIO ); // I/O is used for Prefetch

     // We need a Region for the loop-back contended case.

     enum { fall_in_path = 1, contended_loopback_path = 2 };

     Node *contended_region;

     Node *contended_phi_rawmem;

     if( UseTLAB ) {

       contended_region = toobig_false;

       contended_phi_rawmem = mem;

     } else {

       contended_region = new (C, 3) RegionNode(3);

       contended_phi_rawmem = new (C, 3) PhiNode( contended_region, Type::MEMORY, TypeRawPtr::BOTTOM);

       // Now handle the passing-too-big test.  We fall into the contended

       // loop-back merge point.

       contended_region    ->init_req( fall_in_path, toobig_false );

       contended_phi_rawmem->init_req( fall_in_path, mem );

       transform_later(contended_region);

       transform_later(contended_phi_rawmem);

     }

     // Load(-locked) the heap top.

     // See note above concerning the control input when using a TLAB

     Node *old_eden_top = UseTLAB

       ? new (C, 3) LoadPNode     ( ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM )

       : new (C, 3) LoadPLockedNode( contended_region, contended_phi_rawmem, eden_top_adr );

     transform_later(old_eden_top);

     // Add to heap top to get a new heap top

     Node *new_eden_top = new (C, 4) AddPNode( top(), old_eden_top, size_in_bytes );

     transform_later(new_eden_top);

     // Check for needing a GC; compare against heap end

     Node *needgc_cmp = new (C, 3) CmpPNode( new_eden_top, eden_end );

     transform_later(needgc_cmp);

     Node *needgc_bol = new (C, 2) BoolNode( needgc_cmp, BoolTest::ge );

     transform_later(needgc_bol);

     IfNode *needgc_iff = new (C, 2) IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN );

     transform_later(needgc_iff);

     // Plug the failing-heap-space-need-gc test into the slow-path region

     Node *needgc_true = new (C, 1) IfTrueNode( needgc_iff );

     transform_later(needgc_true);

     if( initial_slow_test ) {

       slow_region    ->init_req( need_gc_path, needgc_true );

       // This completes all paths into the slow merge point

       transform_later(slow_region);

     } else {                      // No initial slow path needed!

       // Just fall from the need-GC path straight into the VM call.

       slow_region    = needgc_true;

     }

     // No need for a GC.  Setup for the Store-Conditional

     Node *needgc_false = new (C, 1) IfFalseNode( needgc_iff );

     transform_later(needgc_false);

     // Grab regular I/O before optional prefetch may change it.

     // Slow-path does no I/O so just set it to the original I/O.

     result_phi_i_o->init_req( slow_result_path, i_o );

     i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem,

                               old_eden_top, new_eden_top, length);

     // Store (-conditional) the modified eden top back down.

     // StorePConditional produces flags for a test PLUS a modified raw

     // memory state.

     Node *store_eden_top;

     Node *fast_oop_ctrl;

     if( UseTLAB ) {

       store_eden_top = new (C, 4) StorePNode( needgc_false, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, new_eden_top );

       transform_later(store_eden_top);

       fast_oop_ctrl = needgc_false; // No contention, so this is the fast path

     } else {

       store_eden_top = new (C, 5) StorePConditionalNode( needgc_false, contended_phi_rawmem, eden_top_adr, new_eden_top, old_eden_top );

       transform_later(store_eden_top);

       Node *contention_check = new (C, 2) BoolNode( store_eden_top, BoolTest::ne );

       transform_later(contention_check);

       store_eden_top = new (C, 1) SCMemProjNode(store_eden_top);

       transform_later(store_eden_top);

       // If not using TLABs, check to see if there was contention.

       IfNode *contention_iff = new (C, 2) IfNode ( needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN );

       transform_later(contention_iff);

       Node *contention_true = new (C, 1) IfTrueNode( contention_iff );

       transform_later(contention_true);

       // If contention, loopback and try again.

       contended_region->init_req( contended_loopback_path, contention_true );

       contended_phi_rawmem->init_req( contended_loopback_path, store_eden_top );

       // Fast-path succeeded with no contention!

       Node *contention_false = new (C, 1) IfFalseNode( contention_iff );

       transform_later(contention_false);

       fast_oop_ctrl = contention_false;

     }

     // Rename successful fast-path variables to make meaning more obvious

     Node* fast_oop        = old_eden_top;

     Node* fast_oop_rawmem = store_eden_top;

     fast_oop_rawmem = initialize_object(alloc,

                                         fast_oop_ctrl, fast_oop_rawmem, fast_oop,

                                         klass_node, length, size_in_bytes);

     if (ExtendedDTraceProbes) {

       // Slow-path call

       int size = TypeFunc::Parms + 2;

       CallLeafNode *call = new (C, size) CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(),

                                                       CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base),

                                                       "dtrace_object_alloc",

                                                       TypeRawPtr::BOTTOM);

       // Get base of thread-local storage area

       Node* thread = new (C, 1) ThreadLocalNode();

       transform_later(thread);

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

       call->init_req(TypeFunc::Parms+1, fast_oop);

       call->init_req( TypeFunc::Control, fast_oop_ctrl );

       call->init_req( TypeFunc::I_O    , top() )        ;   // does no i/o

       call->init_req( TypeFunc::Memory , fast_oop_rawmem );

       call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) );

       call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) );

       transform_later(call);

       fast_oop_ctrl = new (C, 1) ProjNode(call,TypeFunc::Control);

       transform_later(fast_oop_ctrl);

       fast_oop_rawmem = new (C, 1) ProjNode(call,TypeFunc::Memory);

       transform_later(fast_oop_rawmem);

     }

     // Plug in the successful fast-path into the result merge point

     result_region    ->init_req( fast_result_path, fast_oop_ctrl );

     result_phi_rawoop->init_req( fast_result_path, fast_oop );

     result_phi_i_o   ->init_req( fast_result_path, i_o );

     result_phi_rawmem->init_req( fast_result_path, fast_oop_rawmem );

   } else {

     slow_region = ctrl;

   }

   // Generate slow-path call

   CallNode *call = new (C, slow_call_type->domain()->cnt())

     CallStaticJavaNode(slow_call_type, slow_call_address,

                        OptoRuntime::stub_name(slow_call_address),

                        alloc->jvms()->bci(),

                        TypePtr::BOTTOM);

   call->init_req( TypeFunc::Control, slow_region );

   call->init_req( TypeFunc::I_O    , top() )     ;   // does no i/o

   call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs

   call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) );

   call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) );

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

   if (length != NULL) {

     call->init_req(TypeFunc::Parms+1, length);

   }

   // Copy debug information and adjust JVMState information, then replace

   // allocate node with the call

   copy_call_debug_info((CallNode *) alloc,  call);

   if (!always_slow) {

     call->set_cnt(PROB_UNLIKELY_MAG(4));  // Same effect as RC_UNCOMMON.

   }

   _igvn.hash_delete(alloc);

   _igvn.subsume_node(alloc, call);

   transform_later(call);

   // Identify the output projections from the allocate node and

   // adjust any references to them.

   // The control and io projections look like:

   //

   //        v---Proj(ctrl) <-----+   v---CatchProj(ctrl)

   //  Allocate                   Catch

   //        ^---Proj(io) <-------+   ^---CatchProj(io)

   //

   //  We are interested in the CatchProj nodes.

   //

   extract_call_projections(call);

   // An allocate node has separate memory projections for the uses on the control and i_o paths

   // Replace uses of the control memory projection with result_phi_rawmem (unless we are only generating a slow call)

   if (!always_slow && _memproj_fallthrough != NULL) {

     for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) {

       Node *use = _memproj_fallthrough->fast_out(i);

       _igvn.hash_delete(use);

       imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem);

       _igvn._worklist.push(use);

       // back up iterator

       --i;

     }

   }

   // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete _memproj_catchall so

   // we end up with a call that has only 1 memory projection

   if (_memproj_catchall != NULL ) {

     if (_memproj_fallthrough == NULL) {

       _memproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::Memory);

       transform_later(_memproj_fallthrough);

     }

     for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) {

       Node *use = _memproj_catchall->fast_out(i);

       _igvn.hash_delete(use);

       imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough);

       _igvn._worklist.push(use);

       // back up iterator

       --i;

     }

   }

   mem = result_phi_rawmem;

   // An allocate node has separate i_o projections for the uses on the control and i_o paths

   // Replace uses of the control i_o projection with result_phi_i_o (unless we are only generating a slow call)

   if (_ioproj_fallthrough == NULL) {

     _ioproj_fallthrough = new (C, 1) ProjNode(call, TypeFunc::I_O);

     transform_later(_ioproj_fallthrough);

   } else if (!always_slow) {

     for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) {

       Node *use = _ioproj_fallthrough->fast_out(i);

       _igvn.hash_delete(use);

       imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o);

       _igvn._worklist.push(use);

       // back up iterator

       --i;

     }

   }

   // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete _ioproj_catchall so

   // we end up with a call that has only 1 control projection

   if (_ioproj_catchall != NULL ) {

     for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) {

       Node *use = _ioproj_catchall->fast_out(i);

       _igvn.hash_delete(use);

       imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough);

       _igvn._worklist.push(use);

       // back up iterator

       --i;

     }

   }

   // if we generated only a slow call, we are done

   if (always_slow)

     return;

   if (_fallthroughcatchproj != NULL) {

     ctrl = _fallthroughcatchproj->clone();

     transform_later(ctrl);

     _igvn.hash_delete(_fallthroughcatchproj);

     _igvn.subsume_node(_fallthroughcatchproj, result_region);

   } else {

     ctrl = top();

   }

   Node *slow_result;

   if (_resproj == NULL) {

     // no uses of the allocation result

     slow_result = top();

   } else {

     slow_result = _resproj->clone();

     transform_later(slow_result);

     _igvn.hash_delete(_resproj);

     _igvn.subsume_node(_resproj, result_phi_rawoop);

   }

   // Plug slow-path into result merge point

   result_region    ->init_req( slow_result_path, ctrl );

   result_phi_rawoop->init_req( slow_result_path, slow_result);

   result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough );

   transform_later(result_region);

   transform_later(result_phi_rawoop);

   transform_later(result_phi_rawmem);

   transform_later(result_phi_i_o);

   // This completes all paths into the result merge point

 }

 // Helper for PhaseMacroExpand::expand_allocate_common.

 // Initializes the newly-allocated storage.

 Node*

 PhaseMacroExpand::initialize_object(AllocateNode* alloc,

                                     Node* control, Node* rawmem, Node* object,

                                     Node* klass_node, Node* length,

                                     Node* size_in_bytes) {

   InitializeNode* init = alloc->initialization();

   // Store the klass & mark bits

   Node* mark_node = NULL;

   // For now only enable fast locking for non-array types

   if (UseBiasedLocking && (length == NULL)) {

     mark_node = make_load(NULL, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS);

   } else {

     mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype()));

   }

   rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS);

   rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT);

   int header_size = alloc->minimum_header_size();  // conservatively small

   // Array length

   if (length != NULL) {         // Arrays need length field

     rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);

     // conservatively small header size:

     header_size = sizeof(arrayOopDesc);

     ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();

     if (k->is_array_klass())    // we know the exact header size in most cases:

       header_size = Klass::layout_helper_header_size(k->layout_helper());

   }

   // Clear the object body, if necessary.

   if (init == NULL) {

     // The init has somehow disappeared; be cautious and clear everything.

     //

     // This can happen if a node is allocated but an uncommon trap occurs

     // immediately.  In this case, the Initialize gets associated with the

     // trap, and may be placed in a different (outer) loop, if the Allocate

     // is in a loop.  If (this is rare) the inner loop gets unrolled, then

     // there can be two Allocates to one Initialize.  The answer in all these

     // edge cases is safety first.  It is always safe to clear immediately

     // within an Allocate, and then (maybe or maybe not) clear some more later.

     if (!ZeroTLAB)

       rawmem = ClearArrayNode::clear_memory(control, rawmem, object,

                                             header_size, size_in_bytes,

                                             &_igvn);

   } else {

     if (!init->is_complete()) {

       // Try to win by zeroing only what the init does not store.

       // We can also try to do some peephole optimizations,

       // such as combining some adjacent subword stores.

       rawmem = init->complete_stores(control, rawmem, object,

                                      header_size, size_in_bytes, &_igvn);

     }

     // We have no more use for this link, since the AllocateNode goes away:

     init->set_req(InitializeNode::RawAddress, top());

     // (If we keep the link, it just confuses the register allocator,

     // who thinks he sees a real use of the address by the membar.)

   }

   return rawmem;

 }

 // Generate prefetch instructions for next allocations.

 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,

                                         Node*& contended_phi_rawmem,

                                         Node* old_eden_top, Node* new_eden_top,

                                         Node* length) {

    if( UseTLAB && AllocatePrefetchStyle == 2 ) {

       // Generate prefetch allocation with watermark check.

       // As an allocation hits the watermark, we will prefetch starting

       // at a "distance" away from watermark.

       enum { fall_in_path = 1, pf_path = 2 };

       Node *pf_region = new (C, 3) RegionNode(3);

       Node *pf_phi_rawmem = new (C, 3) PhiNode( pf_region, Type::MEMORY,

                                                 TypeRawPtr::BOTTOM );

       // I/O is used for Prefetch

       Node *pf_phi_abio = new (C, 3) PhiNode( pf_region, Type::ABIO );

       Node *thread = new (C, 1) ThreadLocalNode();

       transform_later(thread);

       Node *eden_pf_adr = new (C, 4) AddPNode( top()/*not oop*/, thread,

                    _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) );

       transform_later(eden_pf_adr);

       Node *old_pf_wm = new (C, 3) LoadPNode( needgc_false,

                                    contended_phi_rawmem, eden_pf_adr,

                                    TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM );

       transform_later(old_pf_wm);

       // check against new_eden_top

       Node *need_pf_cmp = new (C, 3) CmpPNode( new_eden_top, old_pf_wm );

       transform_later(need_pf_cmp);

       Node *need_pf_bol = new (C, 2) BoolNode( need_pf_cmp, BoolTest::ge );

       transform_later(need_pf_bol);

       IfNode *need_pf_iff = new (C, 2) IfNode( needgc_false, need_pf_bol,

                                        PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN );

       transform_later(need_pf_iff);

       // true node, add prefetchdistance

       Node *need_pf_true = new (C, 1) IfTrueNode( need_pf_iff );

       transform_later(need_pf_true);

       Node *need_pf_false = new (C, 1) IfFalseNode( need_pf_iff );

       transform_later(need_pf_false);

       Node *new_pf_wmt = new (C, 4) AddPNode( top(), old_pf_wm,

                                     _igvn.MakeConX(AllocatePrefetchDistance) );

       transform_later(new_pf_wmt );

       new_pf_wmt->set_req(0, need_pf_true);

       Node *store_new_wmt = new (C, 4) StorePNode( need_pf_true,

                                        contended_phi_rawmem, eden_pf_adr,

                                        TypeRawPtr::BOTTOM, new_pf_wmt );

       transform_later(store_new_wmt);

       // adding prefetches

       pf_phi_abio->init_req( fall_in_path, i_o );

       Node *prefetch_adr;

       Node *prefetch;

       uint lines = AllocatePrefetchDistance / AllocatePrefetchStepSize;

       uint step_size = AllocatePrefetchStepSize;

       uint distance = 0;

       for ( uint i = 0; i < lines; i++ ) {

         prefetch_adr = new (C, 4) AddPNode( old_pf_wm, new_pf_wmt,

                                             _igvn.MakeConX(distance) );

         transform_later(prefetch_adr);

         prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr );

         transform_later(prefetch);

         distance += step_size;

         i_o = prefetch;

       }

       pf_phi_abio->set_req( pf_path, i_o );

       pf_region->init_req( fall_in_path, need_pf_false );

       pf_region->init_req( pf_path, need_pf_true );

       pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem );

       pf_phi_rawmem->init_req( pf_path, store_new_wmt );

       transform_later(pf_region);

       transform_later(pf_phi_rawmem);

       transform_later(pf_phi_abio);

       needgc_false = pf_region;

       contended_phi_rawmem = pf_phi_rawmem;

       i_o = pf_phi_abio;

    } else if( AllocatePrefetchStyle > 0 ) {

       // Insert a prefetch for each allocation only on the fast-path

       Node *prefetch_adr;

       Node *prefetch;

       // Generate several prefetch instructions only for arrays.

       uint lines = (length != NULL) ? AllocatePrefetchLines : 1;

       uint step_size = AllocatePrefetchStepSize;

       uint distance = AllocatePrefetchDistance;

       for ( uint i = 0; i < lines; i++ ) {

         prefetch_adr = new (C, 4) AddPNode( old_eden_top, new_eden_top,

                                             _igvn.MakeConX(distance) );

         transform_later(prefetch_adr);

         prefetch = new (C, 3) PrefetchWriteNode( i_o, prefetch_adr );

         // Do not let it float too high, since if eden_top == eden_end,

         // both might be null.

         if( i == 0 ) { // Set control for first prefetch, next follows it

           prefetch->init_req(0, needgc_false);

         }

         transform_later(prefetch);

         distance += step_size;

         i_o = prefetch;

       }

    }

    return i_o;

 }

 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) {

   expand_allocate_common(alloc, NULL,

                          OptoRuntime::new_instance_Type(),

                          OptoRuntime::new_instance_Java());

 }

 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {

   Node* length = alloc->in(AllocateNode::ALength);

   expand_allocate_common(alloc, length,

                          OptoRuntime::new_array_Type(),

                          OptoRuntime::new_array_Java());

 }

 // we have determined that this lock/unlock can be eliminated, we simply

 // eliminate the node without expanding it.

 //

 // Note:  The membar's associated with the lock/unlock are currently not

 //        eliminated.  This should be investigated as a future enhancement.

 //

 void PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {

   Node* mem = alock->in(TypeFunc::Memory);

   // The memory projection from a lock/unlock is RawMem

   // The input to a Lock is merged memory, so extract its RawMem input

   // (unless the MergeMem has been optimized away.)

   if (alock->is_Lock()) {

     if (mem->is_MergeMem())

       mem = mem->as_MergeMem()->in(Compile::AliasIdxRaw);

   }

   extract_call_projections(alock);

   // There are 2 projections from the lock.  The lock node will

   // be deleted when its last use is subsumed below.

   assert(alock->outcnt() == 2 && _fallthroughproj != NULL &&

           _memproj_fallthrough != NULL, "Unexpected projections from Lock/Unlock");

   _igvn.hash_delete(_fallthroughproj);

   _igvn.subsume_node(_fallthroughproj, alock->in(TypeFunc::Control));

   _igvn.hash_delete(_memproj_fallthrough);

   _igvn.subsume_node(_memproj_fallthrough, mem);

   return;

 }

 //------------------------------expand_lock_node----------------------

 void PhaseMacroExpand::expand_lock_node(LockNode *lock) {

   Node* ctrl = lock->in(TypeFunc::Control);

   Node* mem = lock->in(TypeFunc::Memory);

   Node* obj = lock->obj_node();

   Node* box = lock->box_node();

   Node *flock = lock->fastlock_node();

   if (lock->is_eliminated()) {

     eliminate_locking_node(lock);

     return;

   }

   // Make the merge point

   Node *region = new (C, 3) RegionNode(3);

   Node *bol = transform_later(new (C, 2) BoolNode(flock,BoolTest::ne));

   Node *iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );

   // Optimize test; set region slot 2

   Node *slow_path = opt_iff(region,iff);

   // Make slow path call

   CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box );

   extract_call_projections(call);

   // Slow path can only throw asynchronous exceptions, which are always

   // de-opted.  So the compiler thinks the slow-call can never throw an

   // exception.  If it DOES throw an exception we would need the debug

   // info removed first (since if it throws there is no monitor).

   assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL &&

            _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock");

   // Capture slow path

   // disconnect fall-through projection from call and create a new one

   // hook up users of fall-through projection to region

   Node *slow_ctrl = _fallthroughproj->clone();

   transform_later(slow_ctrl);

   _igvn.hash_delete(_fallthroughproj);

   _fallthroughproj->disconnect_inputs(NULL);

   region->init_req(1, slow_ctrl);

   // region inputs are now complete

   transform_later(region);

   _igvn.subsume_node(_fallthroughproj, region);

   // create a Phi for the memory state

   Node *mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);

   Node *memproj = transform_later( new (C, 1) ProjNode(call, TypeFunc::Memory) );

   mem_phi->init_req(1, memproj );

   mem_phi->init_req(2, mem);

   transform_later(mem_phi);

     _igvn.hash_delete(_memproj_fallthrough);

   _igvn.subsume_node(_memproj_fallthrough, mem_phi);

 }

 //------------------------------expand_unlock_node----------------------

 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {

   Node *ctrl = unlock->in(TypeFunc::Control);

   Node* mem = unlock->in(TypeFunc::Memory);

   Node* obj = unlock->obj_node();

   Node* box = unlock->box_node();

   if (unlock->is_eliminated()) {

     eliminate_locking_node(unlock);

     return;

   }

   // No need for a null check on unlock

   // Make the merge point

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

   FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box );

   funlock = transform_later( funlock )->as_FastUnlock();

   Node *bol = transform_later(new (C, 2) BoolNode(funlock,BoolTest::ne));

   Node *iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );

   // Optimize test; set region slot 2

   Node *slow_path = opt_iff(region,iff);

   CallNode *call = make_slow_call( (CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), "complete_monitor_unlocking_C", slow_path, obj, box );

   extract_call_projections(call);

   assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL &&

            _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock");

   // No exceptions for unlocking

   // Capture slow path

   // disconnect fall-through projection from call and create a new one

   // hook up users of fall-through projection to region

   Node *slow_ctrl = _fallthroughproj->clone();

   transform_later(slow_ctrl);

   _igvn.hash_delete(_fallthroughproj);

   _fallthroughproj->disconnect_inputs(NULL);

   region->init_req(1, slow_ctrl);

   // region inputs are now complete

   transform_later(region);

   _igvn.subsume_node(_fallthroughproj, region);

   // create a Phi for the memory state

   Node *mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);

   Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) );

   mem_phi->init_req(1, memproj );

   mem_phi->init_req(2, mem);

   transform_later(mem_phi);

     _igvn.hash_delete(_memproj_fallthrough);

   _igvn.subsume_node(_memproj_fallthrough, mem_phi);

 }

 //------------------------------expand_macro_nodes----------------------

 //  Returns true if a failure occurred.

 bool PhaseMacroExpand::expand_macro_nodes() {

   if (C->macro_count() == 0)

     return false;

   // Make sure expansion will not cause node limit to be exceeded.  Worst case is a

   // macro node gets expanded into about 50 nodes.  Allow 50% more for optimization

   if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) )

     return true;

   // expand "macro" nodes

   // nodes are removed from the macro list as they are processed

   while (C->macro_count() > 0) {

     Node * n = C->macro_node(0);

     assert(n->is_macro(), "only macro nodes expected here");

     if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) {

       // node is unreachable, so don't try to expand it

       C->remove_macro_node(n);

       continue;

     }

     switch (n->class_id()) {

     case Node::Class_Allocate:

       expand_allocate(n->as_Allocate());

       break;

     case Node::Class_AllocateArray:

       expand_allocate_array(n->as_AllocateArray());

       break;

     case Node::Class_Lock:

       expand_lock_node(n->as_Lock());

       break;

     case Node::Class_Unlock:

       expand_unlock_node(n->as_Unlock());

       break;

     default:

       assert(false, "unknown node type in macro list");

     }

     if (C->failing())  return true;

   }

   _igvn.optimize();

   return false;

 }