HLASM: V1R6 Language Ref

Data attributes000000 00000 00004 8 a csect9 mac1 GOOD_SYMBOL,?BAD_SYMBOL?000000 E4 10+ DC C’U’ DC containing type attribute for op1000001 E4 11+ DC C’U’ DC containing type attribute for op212 endFigure 36. Undefined and unknown type attributesWhen the macro MAC1 is called in Figure 37, GOOD_SYMBOL is a valid symbolname, and has been defined in the DC instruction at statement 12.?BAD_SYMBOL? is a not valid symbol name, and the assembler issues anerror message at statement 13. The type attribute for GOOD_SYMBOL is C,meaning the symbol represents a character constant. The type attribute for?BAD_SYMBOL? is U, meaning the type is unknown.000000 00000 00006 8 a csect9 mac1 GOOD_SYMBOL,?BAD_SYMBOL?000000 C3 10+ DC C’C’ DC containing type attribute for op1000001 E4 11+ DC C’U’ DC containing type attribute for op2000002 A9 12 GOOD_SYMBOL dc cl1’z’000003 A9 13 ?BAD_SYMBOL? dc cl1’z’** ASMA147E Symbol too long, or first character not a letter - ?BAD_SYMBOL?14 endFigure 37. Unknown type attribute for invalid symbolThe type attribute value U, meaning undefined, unknown, or unassigned, isassigned to the following:v Ordinary symbols used as labels:– 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 ofthe label is generated due to conditional assembly statements. Alookahead scan for attributes of a symbol may encounter more thanone occurrence of a symbol, in which case the assembler can’t yet tellwhich statement(s) will be generated. In such cases, type attribute Uis assigned. At a later time, when the symbol has been generated, itstype attribute is changed to the correct value for the type of statementit names.v SETC variable symbols that have a value other than a null characterstring or the name of an instruction that can be referred to be a typeattribute referencev 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 beassigned a value of a null string, when they have a type attributevalue of Ov Macro instruction operands that specify a literal that is not a duplicate ofa literal used in a machine instructionv Inner macro instruction operands that are ordinary symbolsChapter 9. How to write conditional assembly instructions 327