Q32001: Explanation of a MAP File

Article: Q32001
Product(s): See article
Version(s): 3.x 5.01.20 5.01.21
Operating System(s): MS-DOS
Keyword(s): ENDUSER | | mspl13_basic
Last Modified: 15-JUL-1988

A MAP file gives you a picture of how your code and data are
arranged in memory when the program is loaded.
   First you get the list of segments in the order in which they will
be loaded into memory. For each segment, you have its starting
address, length, name, and class. Following the segments are groups,
each specifying the starting address of the group.
   If you specify the /MAP switch and list filename, in the MAP you
will get two lists of public symbols in your program. The first list
will be sorted alphabetically, the second by addresses.
   If you specify the /LINENUMBERS switch, then in the MAP, you will
get line numbers and the associated addresses of your source program.
To produce line numbers in the MAP, give LINK an object file with
line-number information. Use the /Zd option with any Microsoft
compiler to include line numbers in the object file.
   Information from the MAP will help you debug your program and
understand how the program is loaded into memory.

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