PRB: Line Parsing Order: Looks Up Second Token FirstLast reviewed: February 21, 1995Article ID: Q35128 |
The information in this article applies to:
SYMPTOMSThe example below will generate the warning:
warning A4016: Reserved word used as symbol: MOVwhen assembled with Microsoft Macro Assembler (MASM) 5.1 and 5.1a. This warning is misleading. MASM 6.0, 6.0a, and 6.0b generate the more specific error message:
error A2001: immediate operand not allowed CAUSEThe reference to a_struc.a in the example below is a reference to a structure template and not to a variable stored in memory. Thus, a_struc.a is a constant or immediate operand. MASM 5.1 and 5.1a always looks up the second token on the line first. In the case below, it sees "a_struc". Because a_struc is a structure declaration, MASM assumes the line declares a structure instance with "MOV" being the label. At this point, MASM errors on trying to use reserved symbol "MOV" as a structure instance label.
RESOLUTIONThis is the expected behavior of MASM.
MORE INFORMATION
Sample Code; Assemble options needed: none a_struc STRUC a DW ?a_struc ENDS _TEXT SEGMENT 'CODE' ASSUME CS:_TEXT start: mov a_struc.a, ax mov ax, 4C00h int 21h_TEXT ENDS END start
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Additional reference words: 5.10 5.10a 6.00 6.00a 6.00b
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