HLASM Language Reference

ANOP Instruction
the next sequential prototype instruction after the call; that is, it continues
processing at the next outer level of nested macros.
The assembler halves the ACTR counter value when it encounters serious syntax
errors in conditional assembly instructions.
ANOP Instruction
You can specify a sequence symbol in the name field of an ANOP instruction, and
use the symbol as a label for branching purposes.
The ANOP instruction carries out no operation itself, but you can use it to allow
conditional assembly to resume assembly or conditional generation at an instruction
that does not have a sequence symbol in its name field. For example, if you
wanted to branch to a SETA, SETB, or SETC assignment instruction, which
requires a variable symbol in the name field, you could insert a labeled ANOP
instruction immediately before the assignment instruction. By branching to the
ANOP instruction with an AIF or AGO instruction, you would, in effect, be branching
to the assignment instruction.
►►──sequence_symbol──ANOP──────────────────────────────────────────►◄
sequence_symbol
is a sequence symbol.
No operation is carried out by an ANOP instruction. Instead, if a branch is taken to
the ANOP instruction, the assembler processes the next sequential instruction.
Example:
MACRO
&NAME MOVE &T,&F
LCLC
&TYPE
AIF (T'&T EQ 'F').FTYPE Statement 1
&TYPE SETC 'E' Statement 2
.FTYPE ANOP Statement 3
&NAME ST&TYPE 2,SAVEAREA Statement 4
L&TYPE
2,&F
ST&TYPE 2,&T
L&TYPE
2,SAVEAREA
MEND
Statement 1 determines if the type attribute of the first macro instruction operand is
the letter F. If the type attribute is not the letter F, Statement 2 is the next
statement processed by the assembler. If the type attribute is the letter F,
Statement 4 should be processed next. However, because there is a variable
symbol (&NAME) in the name field of Statement 4, the required sequence symbol
(.FTYPE) cannot be placed in the name field. Therefore, an ANOP instruction
(Statement 3) must be placed before Statement 4.
Then, if the type attribute of the first operand is the letter F, the next statement
processed by the assembler is the statement named by sequence symbol .FTYPE.
The value of &TYPE retains its initial null character value because the SETC
instruction is not processed. Because .FTYPE names an ANOP instruction, the next
Chapter 9. How to Write Conditional Assembly Instructions 395