HLASM Language Reference

Data Attributes
– For the LTORG instruction
– For the EQU instruction without a third operand
– For DC and DS statements that contain variable symbols, for example,
U1 DC &X'1'
| – That are defined more than once, even though only one instance of the
| label is generated due to conditional assembly statements. A
| lookahead scan for attributes of a symbol may encounter more than one
| occurrence of a symbol, in which case the assembler can't yet tell which
| statement(s) will be generated. In such cases, type attribute U is
| assigned. At a later time, when the symbol has been generated, its type
| attribute is changed to the correct value for the type of statement it
| names.
Notes:
SETC variable symbols that have a value other than a null character string
or the name of an instruction that can be referred to be a type attribute
reference
System variable symbols except:
– &SYSDATC, &SYSM_HSEV, &SYSM_SEV, &SYSNDX, &SYSNEST,
&SYSOPT_DBCS, &SYSOPT_RENT, &SYSOPT_XOBJECT, and
&SYSSTMT, which always have a type attribute value of N
– Some other character type system variable symbols which may be
assigned a value of a null string, when they have a type attribute value
of O
Macro instruction operands that specify a literal that is not a duplicate of a
literal used in a machine instruction
Inner macro instruction operands that are ordinary symbols
1. Ordinary symbols used in the name field of an EQU instruction have the type
attribute value U. However, the third operand of an EQU instruction can be
used explicitly to assign a type attribute value to the symbol in the name field.
2. The type attribute of a sublist is set to the same value as the type attribute of
the first element of the sublist.
3. High Level Assembler and earlier assemblers treat the type attribute differently:
Because High Level Assembler allows attribute references to statements
generated through substitution, certain cases in which a type attribute of U
(undefined, unknown, or unassigned) or M (macro name field) is given
under the DOS/VSE Assembler, may give a valid type attribute under High
Level Assembler. If the value of the SETC symbol is equal to the name of
an instruction that can be referred to by the type attribute, High Level
Assembler lets you use the type attribute with a SETC symbol.
Because High Level Assembler allows attribute references to literals,
certain cases in which a type attribute of U (undefined, unknown, or
unassigned) is given by Assembler F and Assembler H for a macro
operand that specifies a literal, may give a valid type attribute under High
Level Assembler. If the literal specified in the macro instruction operand is
a duplicate of a literal specified in open code, or previously generated by
conditional assembly processing or macro generation, High Level
Chapter 9. How to Write Conditional Assembly Instructions 331