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

 /*

  * 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/matcher.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() ) {

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

       continue;

     }

     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;

     }

   }

   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::bottom_type() const {

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

   const Type *tb = in(0)->bottom_type();

   if( tb == Type::TOP ) return Type::TOP;

   if( tb == Type::BOTTOM ) return Type::BOTTOM;

   const TypeTuple *t = tb->is_tuple();

   return t->field_at(_con);

 }

 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) ) return Type::TOP;

   const Type *t = phase->type(in(0));

   if( t == Type::TOP ) return t;

   if( t == Type::BOTTOM ) return t;

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

 }

 //------------------------------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();

 }