1 * local labels 2 * two forms, $[0-9] and label? are allowed 3 * Local labels are undefined/reset in one of four ways: 4 * .newblock 5 * changing sections 6 * entering an include file 7 * leaving an include file 8 .global addra, addrb, addrc 9 label1: ld addra,a 10 sub addrb,a 11 bc $1, alt ; generates frag! 12 ld addrb, a 13 b $2 14 $1: ld addra,a 15 $2 add addrc,a 16 .newblock 17 bc $1,alt 18 stl a, addrc 19 $1 nop 20 21 * #1, First definition of local label 'lab' 22 nop 23 lab? add #1,a ; reports as line 17? 24 b lab? 25 * #2, Included file also defines local label 'lab' 26 .copy labels.inc 27 * #3, Next definition; exit from .copy clears all locals 28 lab? add #3,a ; reports as line 22? 29 b lab? 30 * #4, Next definition is within macro; supersedes previous definition while 31 * within the macro 32 mac .macro 33 lab? add #4,a ; line 31? 34 b lab? 35 .endm 36 * Macro invocation 37 mac 38 * This reference should resolve to definition #3 39 after_macro: 40 b lab? 41 * Section change clears all definitions; it's a CODE section if we see insns 42 .sect new_section 43 nop 44 lab? add #5,a 45 nop 46 nop 47 b lab? 48 * Newblock directive clears local labels 49 .newblock 50 lab? add #6,a 51 nop 52 nop 53 b lab? 54 .end 55 56
