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 /*

  * Copyright (c) 1997, 2012, 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

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  */

 #include "precompiled.hpp"

 #include "opto/callnode.hpp"

 #include "opto/cfgnode.hpp"

 #include "opto/matcher.hpp"

 #include "opto/mathexactnode.hpp"

 #include "opto/multnode.hpp"

 #include "opto/opcodes.hpp"

 #include "opto/phaseX.hpp"

 #include "opto/regmask.hpp"

 #include "opto/type.hpp"

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

 //------------------------------MultiNode--------------------------------------

 const RegMask &MultiNode::out_RegMask() const {

   return RegMask::Empty;

 }

 Node *MultiNode::match( const ProjNode *proj, const Matcher *m ) { return proj->clone(); }

 //------------------------------proj_out---------------------------------------

 // Get a named projection

 ProjNode* MultiNode::proj_out(uint which_proj) const {

   assert(Opcode() != Op_If || which_proj == (uint)true || which_proj == (uint)false, "must be 1 or 0");

   assert(Opcode() != Op_If || outcnt() == 2, "bad if #1");

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

     Node *p = fast_out(i);

     if (p->is_Proj()) {

       ProjNode *proj = p->as_Proj();

       if (proj->_con == which_proj) {

         assert(Opcode() != Op_If || proj->Opcode() == (which_proj?Op_IfTrue:Op_IfFalse), "bad if #2");

         return proj;

       }

     } else if (p->is_FlagsProj()) {

       FlagsProjNode *proj = p->as_FlagsProj();

       if (proj->_con == which_proj) {

         return proj;

       }

     } else {

       assert(p == this && this->is_Start(), "else must be proj");

       continue;

     }

   }

   return NULL;

 }

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

 //------------------------------ProjNode---------------------------------------

 uint ProjNode::hash() const {

   // only one input

   return (uintptr_t)in(TypeFunc::Control) + (_con << 1) + (_is_io_use ? 1 : 0);

 }

 uint ProjNode::cmp( const Node &n ) const { return _con == ((ProjNode&)n)._con && ((ProjNode&)n)._is_io_use == _is_io_use; }

 uint ProjNode::size_of() const { return sizeof(ProjNode); }

 // Test if we propagate interesting control along this projection

 bool ProjNode::is_CFG() const {

   Node *def = in(0);

   return (_con == TypeFunc::Control && def->is_CFG());

 }

 const Type* ProjNode::proj_type(const Type* t) const {

   if (t == Type::TOP) {

     return Type::TOP;

   }

   if (t == Type::BOTTOM) {

     return Type::BOTTOM;

   }

   t = t->is_tuple()->field_at(_con);

   Node* n = in(0);

   if ((_con == TypeFunc::Parms) &&

       n->is_CallStaticJava() && n->as_CallStaticJava()->is_boxing_method()) {

     // The result of autoboxing is always non-null on normal path.

     t = t->join(TypePtr::NOTNULL);

   }

   return t;

 }

 const Type *ProjNode::bottom_type() const {

   if (in(0) == NULL) return Type::TOP;

   return proj_type(in(0)->bottom_type());

 }

 const TypePtr *ProjNode::adr_type() const {

   if (bottom_type() == Type::MEMORY) {

     // in(0) might be a narrow MemBar; otherwise we will report TypePtr::BOTTOM

     const TypePtr* adr_type = in(0)->adr_type();

     #ifdef ASSERT

     if (!is_error_reported() && !Node::in_dump())

       assert(adr_type != NULL, "source must have adr_type");

     #endif

     return adr_type;

   }

   assert(bottom_type()->base() != Type::Memory, "no other memories?");

   return NULL;

 }

 bool ProjNode::pinned() const { return in(0)->pinned(); }

 #ifndef PRODUCT

 void ProjNode::dump_spec(outputStream *st) const { st->print("#%d",_con); if(_is_io_use) st->print(" (i_o_use)");}

 #endif

 //----------------------------check_con----------------------------------------

 void ProjNode::check_con() const {

   Node* n = in(0);

   if (n == NULL)       return;  // should be assert, but NodeHash makes bogons

   if (n->is_Mach())    return;  // mach. projs. are not type-safe

   if (n->is_Start())   return;  // alas, starts can have mach. projs. also

   if (_con == SCMemProjNode::SCMEMPROJCON ) return;

   const Type* t = n->bottom_type();

   if (t == Type::TOP)  return;  // multi is dead

   assert(_con < t->is_tuple()->cnt(), "ProjNode::_con must be in range");

 }

 //------------------------------Value------------------------------------------

 const Type *ProjNode::Value( PhaseTransform *phase ) const {

   if (in(0) == NULL) return Type::TOP;

   return proj_type(phase->type(in(0)));

 }

 //------------------------------out_RegMask------------------------------------

 // Pass the buck uphill

 const RegMask &ProjNode::out_RegMask() const {

   return RegMask::Empty;

 }

 //------------------------------ideal_reg--------------------------------------

 uint ProjNode::ideal_reg() const {

   return bottom_type()->ideal_reg();

 }

 //-------------------------------is_uncommon_trap_proj----------------------------

 // Return true if proj is the form of "proj->[region->..]call_uct"

 bool ProjNode::is_uncommon_trap_proj(Deoptimization::DeoptReason reason) {

   int path_limit = 10;

   Node* out = this;

   for (int ct = 0; ct < path_limit; ct++) {

     out = out->unique_ctrl_out();

     if (out == NULL)

       return false;

     if (out->is_CallStaticJava()) {

       int req = out->as_CallStaticJava()->uncommon_trap_request();

       if (req != 0) {

         Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req);

         if (trap_reason == reason || reason == Deoptimization::Reason_none) {

            return true;

         }

       }

       return false; // don't do further after call

     }

     if (out->Opcode() != Op_Region)

       return false;

   }

   return false;

 }

 //-------------------------------is_uncommon_trap_if_pattern-------------------------

 // Return true  for "if(test)-> proj -> ...

 //                          |

 //                          V

 //                      other_proj->[region->..]call_uct"

 //

 // "must_reason_predicate" means the uct reason must be Reason_predicate

 bool ProjNode::is_uncommon_trap_if_pattern(Deoptimization::DeoptReason reason) {

   Node *in0 = in(0);

   if (!in0->is_If()) return false;

   // Variation of a dead If node.

   if (in0->outcnt() < 2)  return false;

   IfNode* iff = in0->as_If();

   // we need "If(Conv2B(Opaque1(...)))" pattern for reason_predicate

   if (reason != Deoptimization::Reason_none) {

     if (iff->in(1)->Opcode() != Op_Conv2B ||

        iff->in(1)->in(1)->Opcode() != Op_Opaque1) {

       return false;

     }

   }

   ProjNode* other_proj = iff->proj_out(1-_con)->as_Proj();

   if (other_proj->is_uncommon_trap_proj(reason)) {

     assert(reason == Deoptimization::Reason_none ||

            Compile::current()->is_predicate_opaq(iff->in(1)->in(1)), "should be on the list");

     return true;

   }

   return false;

 }