Relocatable Object Module Format (OMF) Specification

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Relocatable Object Module Format C4H or C5H LINSYM—Symbol Line Numbers Record Description This record will be used to output line numbers for functions specified through COMDAT records. Each LINSYM record is associated with a preceding COMDAT record. History This record is an extension to the original set of 8086 object record types. It was added for Microsoft C 7.0. Record Format 1 2 1 1 or 2 [1] [2] 2 2 or 4 1 C4 Record Flags Public Line Line Checksum or Length Name Number Number C5 Offset Flags Field This field contains one defined bit: 01H Continuation bit. If clear, this COMDAT record establishes a new instance of the COMDAT variable; otherwise, the data is a continuation of the previous COMDAT of the symbol. Public Name Field [1] Microsoft LINK recognizes this field as a regular logical name index indicating the name of the base of the LINSYM record. [2] IBM LINK386 recognizes this field as a length-preceded name indicating the name of the base of the LINSYM record. Line Number Field An unsigned number in the range 0 to 65,535. Line Number Offset Field The offset relative to the base specified by the symbol name base. The size of this field depends on the record type. Notes Record type C5H is identical to C4H except that the Line Number Offset field is 4 bytes instead of 2. This record is used to output line numbers for functions specified through COMDAT records. Often, the residing segment as well as the relative offsets of such functions is unknown at compile time, in that the linker is the final arbiter of such information. For such cases, most compilers will generate this record to specify the line number/offset pairs relative to a symbolic name. 64 OMF Specification, Version 1.1 Tool Interface Standards (TIS)
Relocatable Object Module Format This record will also be used to discard duplicate LINNUM information. If the linker encounters two or more LINSYM records with matching symbolic names (corresponding to multiple COMDAT records with the same name), the linker will keep the one that corresponds to the retained COMDAT. LINSYM records must follow the COMDATs to which they refer. A LINSYM on a given symbol refers to the most recent COMDAT on the same symbol. LINSYMs inherit the "localness" of their COMDATs. Tool Interface Standards (TIS) OMF Specification, Version 1.1 65
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Relocatable Object Module Format (OMF) Specification

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