/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 *
 * Author: Ceriel J.H. Jacobs
 */
#ifndef DESIG_H_
#define DESIG_H_

/* D E S I G N A T O R   D E S C R I P T I O N S */

/* $Id$ */

#include <em_arith.h>

/* Generating code for designators is not particularly easy, especially if
   you don't know wether you want the address or the value.
   The next structure is used to generate code for designators.
   It contains information on how to find the designator, after generation
   of the code that is common to both address and value computations.
*/

struct desig {
	short	dsg_kind;
#define DSG_INIT	0	/* don't know anything yet */
#define DSG_LOADED	1	/* designator loaded  on top of the stack */
#define DSG_PLOADED	2	/* designator accessible through pointer on
				   stack, possibly with an offset
				*/
#define DSG_FIXED	3	/* designator directly accessible */
#define DSG_PFIXED	4	/* designator accessible through directly
				   accessible pointer
				*/
#define DSG_INDEXED	5	/* designator accessible through array
				   operation. Address of array descriptor on
				   top of the stack, index beneath that, and
				   base address beneath that
				*/
	arith	dsg_offset;	/* contains an offset for PLOADED,
				   or for FIXED or PFIXED it contains an
				   offset from dsg_name, if it exists,
				   or from the current Local Base
				*/
	char	*dsg_name;	/* name of global variable, used for
				   FIXED and PFIXED
				*/
	struct def *dsg_def;	/* def structure associated with this
				   designator, or 0
				*/
};


/* The next structure describes the designator in a with-statement.
   We have a linked list of them, as with-statements may be nested.
*/

struct withdesig {
	struct withdesig *w_next;
	int w_flags;		/* D_USED|D_DEFINED */
	struct scope *w_scope;	/* scope in which fields of this record
				   reside
				*/
	struct desig w_desig;	/* a desig structure for this particular
				   designator
				*/
};

extern struct withdesig	*WithDesigs;

#define NO_LABEL	((label) 0)

struct type;
struct node;


void LOL(arith offset, arith size);
void STL(arith offset, arith size);
void CodeValue(register struct desig *ds, register struct type *tp);
void ChkForFOR(register struct node *nd);
void CodeStore(register struct desig *ds, register struct type *tp);
void CodeCopy(register struct desig *lhs, register struct desig *rhs, arith sz, arith *psize);
void CodeMove(register struct desig *rhs, register struct node *left, struct type *rtp);
void CodeAddress(register struct desig *ds);
void CodeFieldDesig(register struct def *df, register struct desig *ds);
void CodeVarDesig(register struct def *df, register struct desig *ds);
void CodeDesig(register struct node *nd, register struct desig *ds);

#endif /* DESIG_H_ */