Storage classes

The storage class field has one of the values described in ``Storage classes'' These #defines may be found in the header file fstorclass.h.

Storage classes

Mnemonic	Value	Storage Class
C_EFCN	-1	physical end of a function
C_NULL	0	-
C_AUTO	1	automatic variable
C_EXT	2	external symbol
C_STAT	3	static
C_REG	4	register variable
C_EXTDEF	5	external definition
C_LABEL	6	label
C_ULABEL	7	undefined label
C_MOS	8	member of structure
C_ARG	9	function argument
C_STRTAG	10	structure tag
C_MOU	11	member of union
C_UNTAG	12	union tag
C_TPDEF	13	type definition
C_USTATIC	14	uninitialized static
C_ENTAG	15	enumeration tag
C_MOE	16	member of enumeration
C_REGPARM	17	register parameter
C_FIELD	18	bit field
C_BLOCK	100	beginning and end of block
C_FCN	101	beginning and end of function
C_EOS	102	end of structure
C_FILE	103	file name
C_LINE	104	used only by utility programs
C_ALIAS	105	duplicated tag
C_HIDDEN	106	like static, used to avoid name conflicts
C_SHADOW	107	shadow symbol
C_WEAKEXT	108	like C_EXT, but with weak linkage

All of these storage classes except for C_ALIAS and C_HIDDEN are generated by the cc or as commands. The compress utility, cprs(CP), generates the C_ALIAS mnemonic. This utility removes duplicated structure, union, and enumeration definitions and puts alias entries in their places. The storage class C_HIDDEN is not used by any UNIX system tools. Some of these storage classes are used only internally by the C compilation systems. These storage classes are C_EFCN, C_EXTDEF, C_ULABEL, C_USTATIC, and C_LINE.