Pass 1 flowchart

Feb 21, 2013Download as PPT, PDF4 likes31,068 views

1) Pass 1 processes macro definitions by reading source code cards and entering macro names, parameters, and lines into a Macro Definition Table (MDT). 2) Pass 2 processes macro calls by searching for macro names in source code, expanding the macros by retrieving lines from the MDT and substituting arguments, and writing the expanded source code to a new file. 3) The process repeats until all macros are expanded.

Macro Processors

Flowcharts
Pass 1-Processing macro definitions
Pass 2-Processing macro calls and expansion

Pass 1
Pass 1 – processing macro definitions

MDTC<-1
MNTC<-1

Read next
source card

MACRO No
Write copy of
pseudo-
source card
op?
Yes
END
No
pseudo-
Read next
op?
source card
Yes

Enter macro name and Go to Pass 2
current value of MDTC Read next
in MNT entry number source card
MNTC
Substitute
index
MNTC <- MNTC + 1 notation for
arguments

Prepare argument list array
Enter line into MDT

Enter macro name card
into MDT MDTC <- MDTC + 1

MDTC <- MDTC + 1
MEND
pseudo-
Yes op? No

Pass 2
Pass 2 – processing macro calls and expansion

Read next
source card
(copied by
pass 1)

Search MNT for match
with operation code

MACRO No Write into
name expanded
found? source card
file
Yes
END
No
pseudo-
MDTP <- MDT index
op?
from MNT entry
Yes
Supply expanded
Set up argument list
source file to
array
assembler
processing
MDTP <- MDTP + 1

Get line from MDT

Substitute arguments
from macro call

MEND Write
pseudo- expanded
Yes op? source card
No

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