Relocatable Object Module Format (OMF) Specification
Relocatable Object Module Format (OMF) Specification
Relocatable Object Module Format (OMF) Specification
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<strong>Relocatable</strong> <strong>Object</strong> <strong>Module</strong> <strong>Format</strong><br />
94H or 95H LINNUM—Line Numbers Record<br />
Description<br />
The LINNUM record relates line numbers in source code to addresses in object code.<br />
History<br />
Record type 95H is added for 32-bit linkers; allowing for 32-bit debugger style-specific information.<br />
Note: For instantiated inline functions in Microsoft C 7.0, line numbers are output in LINSYM records<br />
with a reference to the function name instead of the segment.<br />
Record <strong>Format</strong><br />
1 2 1 or 2 1 or 2 1<br />
94 Record Base Base Debugger Checksum<br />
or 95 Length Group Segment Style-specific<br />
Information<br />
<br />
Base Group and Base Segment Fields<br />
The Base Group and Base Segment fields contain indexes specifying previously defined GRPDEF and SEGDEF<br />
records.<br />
Notes<br />
The debugger style-specific information is indicated by comment class A1.<br />
Although the complete Intel 8086 specification allows the Base Group and Base Segment fields to refer<br />
to a group or to an absolute segment as well as to a relocatable segment, some linkers commonly<br />
restrict references in this field to relocatable segments.<br />
The following discussion uses the Microsoft debugger style-specific information. The debugger stylespecific<br />
information field in the LINNUM record is composed as follows:<br />
2 2 or 4<br />
Line<br />
Number<br />
Line Number<br />
Offset<br />
<br />
For Microsoft LINK LINNUM records, the Line Number field contains a 16-bit quantity, in the range 0<br />
through 7FFF and is, as its name indicates, a line number in the source code. The Line Number Offset<br />
field contains a 2-byte or 4-byte quantity that gives the translated code or data's start byte in the<br />
program segment defined by the SEGDEF index (4 bytes if the record type is 95H; 2 bytes for type<br />
94H).<br />
The Line Number and Line Number Offset fields can be repeated, so a single LINNUM record can<br />
specify multiple line numbers in the same segment.<br />
Tool Interface Standards (TIS) <strong>OMF</strong> <strong>Specification</strong>, Version 1.1 33