4-5. Suppose the program fragment below is input to the assembler . EQU , $050 L

Question

4-5. Suppose the program fragment below is input to the assembler . EQU , $050 LDAK SYM1 ADA LAB2 MUL# SYM3 ; location 1 LOOP: CMA LAB4 JGE LOOP HLT ; location 2 . EQU SYM1,1234 • EQUSYM3, $12c EQU o, $100 LAB2: .WORD $5B43DE ; location 3 LAB4: BLKW 1,65 What are the contents of the symbol table during the first pass after (a) all of the instructions up to and including location 1 have been processed? (b) all of the instructions up to and including location 2 have been processed? (c) all of the instructions up to and including location 3 have been processed?

Explanation / Answer

a)

Symbol

Type

Scope

@

-

Block Local

SYM1

int

Block Local

LAB2

word

Global

SYM3

Int

Block Local

b)

Symbol

Type

Scope

@

-

Block Local

SYM1

int

Block Local

LAB2

word

Global

SYM3

Int

Block Local

LAB4

word

Global

c)

Symbol

Type

Scope

LAB2

Word

Global

LAB4

word

Global

SYM1

-

Loop block

SYM3

-

Loop block

@

-

Loop block

Symbol

Type

Scope

@

-

Block Local

SYM1

int

Block Local

LAB2

word

Global

SYM3

Int

Block Local

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