Relocatable Object Module Format (OMF) Specification

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Relocatable Object Module Format 82H LHEADR—Library Module Header Record Description This record is very similar to the THEADR record. It is used to indicate the name of a module within a library file (which has an internal organization different from that of an object module). History This record type was defined in the original Intel 8086 specification with the same format but with a different purpose, so its use for libraries should be considered a Microsoft extension. Record Format 1 2 1 1 82 Record Length String Length Name String Checksum Note: The THEADR, and LHEADR records are handled identically. See Appendix 2 for a complete description of these library file format. 8 OMF Specification, Version 1.1 Tool Interface Standards (TIS)
Relocatable Object Module Format 88H COMENT—Comment Record Description The COMENT record contains a character string that may represent a plain text comment, a symbol meaningful to a program accessing the object module, or even binary-encoded identification data. An object module can contain any number of COMENT records. History Before the VENDEXT record was added for TIS, the COMENT record was the primary way of extending the OMF. These extensions were added or changed for 32-bit linkers and continue to be supported in this standard. The comment classes that have been added or changed are 9D, A0, A1, A2, A4, AA, B0, and B1. Comment class A2 was added for Microsoft C version 5.0. Histories for comment classes A0, A3, A4, A6, A7, and A8 are given later in this section. 68000 and big-endian comments were added for Microsoft C version 7.0. Record Format The comment records are actually a group of items, classified by comment class. 1 2 1 1 1 88 Record Length Comment Type Comment Class Commentary Byte String (optional) Checksum Comment Type The Comment Type field is bit significant; its layout is NP NL 0 0 0 0 0 0 where NP NL (no purge bit) is set if the comment is to be preserved by utility programs that manipulate object modules. This bit can protect an important comment, such as a copyright message, from deletion. (no list bit) is set if the comment is not to be displayed by utility programs that list the contents of object modules. This bit can hide a comment. The remaining bits are unused and should be set to 0. Comment Class and Commentary Byte String The Comment Class field is an 8-bit numeric field that conveys information by its value (accompanied by a null byte string) or indicates the information to be found in the accompanying byte string. The byte string's length is determined from the record length, not by an initial count byte. Tool Interface Standards (TIS) OMF Specification, Version 1.1 9
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Relocatable Object Module Format (OMF) Specification

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