jdk8-mips64-public/hotspot: src/share/vm/opto/rootnode.hpp@4b29a725c43c

6912064: type profiles need to be exploited more for dynamic language support
Reviewed-by: kvn

     1 /*

     2  * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 //------------------------------RootNode---------------------------------------

    26 // The one-and-only before-all-else and after-all-else RootNode.  The RootNode

    27 // represents what happens if the user runs the whole program repeatedly.  The

    28 // RootNode produces the initial values of I/O and memory for the program or

    29 // procedure start.

    30 class RootNode : public LoopNode {

    31 public:

    32   RootNode( ) : LoopNode(0,0) {

    33     init_class_id(Class_Root);

    34     del_req(2);

    35     del_req(1);

    36   }

    37   virtual int   Opcode() const;

    38   virtual const Node *is_block_proj() const { return this; }

    39   virtual const Type *bottom_type() const { return Type::BOTTOM; }

    40   virtual Node *Identity( PhaseTransform *phase ) { return this; }

    41   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

    42   virtual const Type *Value( PhaseTransform *phase ) const { return Type::BOTTOM; }

    43 };

    45 //------------------------------HaltNode---------------------------------------

    46 // Throw an exception & die

    47 class HaltNode : public Node {

    48 public:

    49   HaltNode( Node *ctrl, Node *frameptr );

    50   virtual int Opcode() const;

    51   virtual bool  pinned() const { return true; };

    52   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

    53   virtual const Type *Value( PhaseTransform *phase ) const;

    54   virtual const Type *bottom_type() const;

    55   virtual bool  is_CFG() const { return true; }

    56   virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash

    57   virtual bool depends_only_on_test() const { return false; }

    58   virtual const Node *is_block_proj() const { return this; }

    59   virtual const RegMask &out_RegMask() const;

    60   virtual uint ideal_reg() const { return NotAMachineReg; }

    61   virtual uint match_edge(uint idx) const { return 0; }

    62 };

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