Ø SYMTAB (symbol
table)
Ø Content
Label name
and its value (address)
May also
include flag (type, length) etc.
Ø Usage
Pass 1: labels are entered into SYMTAB
with their address (from
LOCCTR) as they are encountered in the source program
Pass 2: symbols used as operands are
looked up in SYMTAB to
obtain the address to be inserted in the assembled instruction
Ø Characteristic
Dynamic
table (insert, delete, search)
Ø Implementation
Hash
table for efficiency of insertion and retrieval
|
COPY 1000
|
|
FIRST 1000
|
|
CLOOP 1003
|
|
ENDFIL 1015
|
|
EOF 1024
|
|
THREE 102D
|
|
ZERO 1030
|
|
RETADR 1033
|
|
LENGTH 1036
|
|
BUFFER 1039
|
|
RDREC 2039
|
|
|
SYMBOL
TABLE(SYMTAB)
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