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src/share/vm/opto/multnode.hpp@bd441136a5ce (annotated)

src/share/vm/opto/multnode.hpp

Thu, 19 Mar 2009 09:13:24 -0700

author

kvn

date

Thu, 19 Mar 2009 09:13:24 -0700

changeset 1082

bd441136a5ce

parent 631

d1605aabd0a1

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Merge

duke@435	1	/*
xdono@631	2	* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	class Matcher;
duke@435	26	class ProjNode;
duke@435	27
duke@435	28	//------------------------------MultiNode--------------------------------------
duke@435	29	// This class defines a MultiNode, a Node which produces many values. The
duke@435	30	// values are wrapped up in a tuple Type, i.e. a TypeTuple.
duke@435	31	class MultiNode : public Node {
duke@435	32	public:
duke@435	33	MultiNode( uint required ) : Node(required) {
duke@435	34	init_class_id(Class_Multi);
duke@435	35	}
duke@435	36	virtual int Opcode() const;
duke@435	37	virtual const Type *bottom_type() const = 0;
duke@435	38	virtual bool is_CFG() const { return true; }
duke@435	39	virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash
duke@435	40	virtual bool depends_only_on_test() const { return false; }
duke@435	41	virtual const RegMask &out_RegMask() const;
duke@435	42	virtual Node *match( const ProjNode *proj, const Matcher *m );
duke@435	43	virtual uint ideal_reg() const { return NotAMachineReg; }
duke@435	44	ProjNode* proj_out(uint which_proj) const; // Get a named projection
duke@435	45
duke@435	46	};
duke@435	47
duke@435	48	//------------------------------ProjNode---------------------------------------
duke@435	49	// This class defines a Projection node. Projections project a single element
duke@435	50	// out of a tuple (or Signature) type. Only MultiNodes produce TypeTuple
duke@435	51	// results.
duke@435	52	class ProjNode : public Node {
duke@435	53	protected:
duke@435	54	virtual uint hash() const;
duke@435	55	virtual uint cmp( const Node &n ) const;
duke@435	56	virtual uint size_of() const;
duke@435	57	void check_con() const; // Called from constructor.
duke@435	58
duke@435	59	public:
duke@435	60	ProjNode( Node *src, uint con, bool io_use = false )
duke@435	61	: Node( src ), _con(con), _is_io_use(io_use)
duke@435	62	{
duke@435	63	init_class_id(Class_Proj);
kvn@561	64	// Optimistic setting. Need additional checks in Node::is_dead_loop_safe().
kvn@561	65	if (con != TypeFunc::Memory || src->is_Start())
kvn@561	66	init_flags(Flag_is_dead_loop_safe);
duke@435	67	debug_only(check_con());
duke@435	68	}
duke@435	69	const uint _con; // The field in the tuple we are projecting
duke@435	70	const bool _is_io_use; // Used to distinguish between the projections
duke@435	71	// used on the control and io paths from a macro node
duke@435	72	virtual int Opcode() const;
duke@435	73	virtual bool is_CFG() const;
duke@435	74	virtual bool depends_only_on_test() const { return false; }
duke@435	75	virtual const Type *bottom_type() const;
duke@435	76	virtual const TypePtr *adr_type() const;
duke@435	77	virtual bool pinned() const;
duke@435	78	virtual const Type *Value( PhaseTransform *phase ) const;
duke@435	79	virtual uint ideal_reg() const;
duke@435	80	virtual const RegMask &out_RegMask() const;
duke@435	81	#ifndef PRODUCT
duke@435	82	virtual void dump_spec(outputStream *st) const;
duke@435	83	#endif
duke@435	84	};