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Explain pass-1 algorithm of passes used in two-pass assembler?
Pass I:
(i) Separate the symbol, operand fields and mnemonic opcode
(ii) Make the symbol table
(iii) Perform the LC processing
(iv) Constructs intermediate representation.
Pass I uses the subsequent data structures:
OPTAB: A table of associated information and mnemonic opcodes
SYMTAB: It is a symbol table
LITTAB: A table literally utilized in the program
OPTAB consists of the field mnemonic opcode, information and class. The class field shows whether the opcode corresponds to a declaration statement (DL) an imperative statement (IS) or an assembler directive (AD).
SYMTAB entry consists of the fields address and length.
A LITTAB entry consists of literals and address.
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