.pg
.x descr
.x Obsolete Macros > descr
.lt
------------------------------------------------------------------------
DESCR	.BLKx length [address] [allot]
------------------------------------------------------------------------
.el
.b 3
This macro will allocate the appropriate descriptor structure for the storage
type specified:
.b
One the following directives must be used in place of .BLK^&x\&.
.b
.lt
	.BLKA	addresses (longwords)
	.BLKB	bytes
	.BLKD	double-precision floating-point (quadwords)
	.BLKF	single-precision floaging-point (longwords)
	.BLKG	G_floating (quadwords)
	.BLKH	H_floating (octawords)
	.BLKL	longwords
	.BLKO	octawords
	.BLKQ	quadwords
	.BLKW	words
.el
.b
If ^&address\& is specified as the asterisk character (i.e. _*), the DESCR
macro will also generate the appropriate block storage allocation directive. 
.b
If ^&address\& is not specified, no storage allocation directive is generated;
you must then follow the DESCR macro with the appropriate storage allocation
directive. 
.b
If ^&address\& is specified and allot is specified as the asterisk character,
the DESCR macro will generate the appropriate block storage allocation
directive and assign it to the label address. 
.b
For example:
.b
.lt
	var
		longword_descr:	descr .blkl 1 *
.el
.b
will generate the following code:
.b
.lt
	longword_descr:
		.word	1
		.byte	dsc$k_dtype_l
		.byte	dsc$k_class_s
		.address	30001$
	30001$:	.blkl	1
.el
.b
See also D__DESCR, STDESCR, and D__STDESCR.