slots.h

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/* slots.h
 * Management of Slots.
 *
 * Copyright (c) 1996, 1997
 *	Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution 
 * of this file. 
 */

#ifndef __slots_h
#define __slots_h

#define	Tcomplex		0
#define	Tnull			Tcomplex
#define	Tconst			1
#define	Tcopy			2
#define	Tcomm			3
#define	Tstore			4
#define	Tload			5

#define	NOSLOT			NULL

#define	MAXTEMPS		16

/* Return slots */
#define	returnInt		0
#define	returnRef		0
#define	returnLong		0 /* 1 */
#define	returnFloat		2
#define	returnDouble		2 /* 3 */

/* Spill/Reload types */
#define	SR_BASIC		0
#define	SR_FUNCTION		1
#define	SR_SUBBASIC		2
#define	SR_SYNC			3
#define	SR_START		4
#define	SR_EXCEPTION		5

/**
 * used to track a function's locals, arguments and temps.
 *
 * regno    - jitter id of the register holding the value of this slot
 * offset   - stack frame offset of this slot
 * wseq     - the last sequence writing this slot (inside the basic block currently translated)
 * rseq     - the last sequence reading this slot (inside the basic block currently translated)
 * rseqslot - this slot is the rseqslot'th parameter of its rseq
 * modified - flag indicating how this slot is modified (rread, rwrite or 0)
 * rnext    - pointer to the next slot whose value is stored in the same register
 * global   - flag indicating whether this slot contains a global value
 *
 * A SlotData represents both, a local variable of the execution frame as defined
 * in the JVM Spec, second edition,