Meta-Assembler (MASM) Programming Reference Manual

MASM Usage
2-10
Cross-Reference Output Format
Cross-reference output consists of two parts: assembly symbol usage and register usage.
Letters are used to define symbol types as follows:
Label definitions
X
L
S
Entry point or external definition. Also known as a label defined at level 0 of the
main assembly.
Label definition at level 1 of the main assembly.
Label in the assembly listing defined below level 1 of the assembly. These labels
are usually found in a $PROC, $FUNC or $REPEAT loop. S is also used for
labels found in conditional code that is skipped by MASM.
Symbol references
U
P
F
N
D
’ ’
Undefined reference. The symbol was undefined when it was encountered
during the assembly.
Procedure call.
Function call.
Node reference or value substitution from a node.
Duplicated value; a reference to a label that caused a D flag during the assembly.
Value substitution (no letter specified).
Register usage
I
Implicit register references, usually from a $EQUF reference, listed in the
register usage table with I.
The line number for references defined or encountered in procedures or functions
reflects the line number of the procedure call. At assembly time, MASM uses sequential
line numbers when processing symbols. Thus, a line number specified in the
cross-reference listing is always the sequential line number where the symbol was
processed, but not necessarily the same line number that appears in the assembly listing.
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