HLASM Language Reference

Inner and Outer Macro Instructions
1 macro
2 &name ainsert_test_macro
3 ainsert ' Macro',back
4 ainsert ' mac1',back
5 ainsert 'Blah blah blah',front
6 &aread aread
7 &aread setc '&aread'(1,1)
8 ainsert '&&n seta n''&&syslist ',back
9 ainsert ' dc a(&&n)',back
1 ainsert ' dc c''&aread'' ',back
11 ainsert ' mend',back
12 mend
13
14 testains csect
15
16 ainsert_test_macro
17+ ainsert ' Macro',back
18+ ainsert ' mac1',back
19+ ainsert 'Blah blah blah',front
2-Blah blah blah
21+ ainsert '&&n seta n''&&syslist ',back
22+ ainsert ' dc a(&&n)',back
23+ ainsert ' dc c''Blah blah '' ',back
24+ ainsert ' mend',back
25> Macro
26> mac1
27>&n seta n'&syslist
28> dc a(&n)
29> dc c'Blah blah '
3> mend
31
32 mac1 a,b,c,d,e,f,g
33+ dc a(7)
34+ dc c'Blah blah '
35
36 end
Figure 83. Expanding Nested Macro Definitions
Inner and Outer Macro Instructions
Any macro instruction you write in the open code of a source module is an outer
macro instruction or call. Any macro instruction that appears within a macro
definition is an inner macro instruction or call.
Levels of Macro Call Nesting
The code generated by a macro definition called by an inner macro call is nested
inside the code generated by the macro definition that contains the inner macro
call. In the macro definition called by an inner macro call, you can include a macro
call to another macro definition. Thus, you can nest macro calls at different levels.
The &SYSNEST system variable indicates how many levels you called. It has the
value 1 in an outer macro, and is incremented by one at a macro call.
312 HLASM V1R5 Language Reference