[SOLVED] Csc 354 – assignment #2 write a complete module that will be used as part of your sic/xe assembler to evaluate the operand field

Write a complete module that will be used as part of your SIC/XE assembler to evaluate the operand field of an assembly language statement.

 

Basic Algorithm

 

The expression file will contain one expression per line similar to the following (0 or more leading spaces):

 

@GREEN                                                       Indirect Addressing – use RFLAG value

#GREEN                                                         Immediate Addressing – use RFLAG value

GREEN,X                                                       Indexed Addressing – use RFLAG value

#9                                                                    Immediate Addressing – Absolute value

GREEN+YELLOW                                        VALUE + VALUE and RFLAG + RFLAG

GREEN–15                                                     VALUE – 15 and RFLAG – Absolute value

=0cABC                                                          Character Literal – 1 character per byte

=0x5A                                                             Hexadecimal Literal – 2 hexadecimal digits per byte

 

Rules for evaluating the relocatability of an expression:

 

 

Literal Table

 

Make sure that each module only contains items/operations directly related to that module.

 

Fully document all parts of your program:

 

All output should be in an easy to understand format.

 

All error messages must provide as much detail as possible.

 

 

 

 

Expression Processing Example

 

SYMS.DAT                                                                                                    Expression File

 

PURPLE:        6          FALSE                                                                        PURPLE+#17

BLACK:          -7         TRUE                                                                          @BLACK

PINK:              9          TRUE                                                                          #WHITE

WHITE:          5          FALSE                                                                        =0CDEFG

WHITE,X

22

=0X5A

PINK+#3

=0X5A

PINK–#3

@#25+RED

=0C5A

#7

 

When a symbol is encountered its attribute values are determined by looking up the symbol in the symbol table.

 

EXPRESSIONS

 

EXPRESSION            VALUE           RELOCATABLE       N-Bit               I-Bit                X-Bit

RED                            13                    RELATIVE                 1                      1                      0

PURPLE+#17             23                    ABSOLUTE               1                      1                      0

@BLACK                   -7                     RELATIVE                 1                      0                      0

#WHITE                     5                      ABSOLUTE               0                      1                      0

WHITE,X                   5                      ABSOLUTE               1                      1                      1

#22                              22                    ABSOLUTE               0                      1                      0

PINK+#3                     12                    RELATIVE                 1                      1                      0

PINK–#3                     6                      RELATIVE                 1                      1                      0

@#25+RED                38                    RELATIVE                 1                      0                      0

#7                                7                      ABSOLUTE               0                      1                      0

 

LITERAL TABLE

 

NAME                        VALUE                       LENGTH                    ADDRESS

=0CDEFG                   44454647                    4                                  1

=0X5A                        5A                               1                                  2

=0C5A                        3541                            2                                  3

 

Notes: