FIX: MASM 5.1/5.1a Cause LINK to Put Uninitialized Data in .EXELast reviewed: September 16, 1997Article ID: Q74670 |
5.10 5.10a
MS-DOS
kbtool kbfixlist kbbuglist
The information in this article applies to:
SYMPTOMSWhen using the .DATA? directive with the Microsoft Macro Assembler (MASM) versions 5.1 and 5.1a, uninitialized data elements may be incorrectly allocated space in the .EXE file.
STATUSMicrosoft has confirmed this to be a problem in MASM versions 5.1 and 5.1a. This problem was corrected in MASM version 6.0.
MORE INFORMATIONThe .DATA? directive indicates the start of the uninitialized data segment, and data declared here is not allocated space in the resulting executable file. However, when declaring an array of structures under .DATA? in MASM 5.1a, space is incorrectly allocated in the .EXE, and the size of the executable program is correspondingly increased. The example code below shows a structure and an array of 100 structure elements being declared. The resulting .EXE size is 1616 (the size of the code [516] plus 1100 [the data size]). However, This amount should only be the code size, 516, because these array elements are uninitialized.
Sample Code; Assemble options needed: none .MODEL small .DATA? testing STRUC a DB 3 DUP(?) b DB 8 DUP(?)testing ENDS array testing 100 DUP(<>) .CODE mov ax,4C00h int 21hEND
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Additional reference words: 5.10 5.10a 6.00 buglist5.10 buglist5.10a
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