This is a simple assembler implemented in C++ to make a quick comprehension of the assembly language possible. Input is given in a text file with assembly commands that are executed by this interpreter. For more information on the assembly language, see Assembly Language - Wikipedia.
The program takes a .txt file as a command line argument and executes the included assembly code line by line. It emulates an assembler running on a machine with three registers: ax, bx, and cx and a stack. The assembler understands a slightly simplified version of the assembly language.
Commands known by the interpreter:
-
mov <dst, src> -
push <src> -
pop <dst> -
add <dst, src> -
sub <dst, src> -
div <dst, src> -
mul <dst, src> -
print <src>
Legend
-
<dst>: Place to store the result of an operation or target place (destination). Can only be a register -
<src>: Place to source the operand (source). Can be a register, string literal or numerical value
Only lower case commands are accepted, otherwise the unknown command exception is thrown. Both floating-point numbers and integers can be entered in decimal format. Floating-point numbers can also be entered in scientific format.
Run interpret.exe <filename> in the command prompt, where <filename> ends with .txt.
Optional: set size of stack. This can be done in the source code (modify preprocessor directive). Default value is 100.
Only .txt files are accepted. If the name of the .txt file contains whitespaces, the whole file name must be enclosed in quotation marks ("file name.txt"). Empty lines are skipped, empty files are allowed. Leading or trailing whitespaces are not allowed and an exception is thrown.
Note: numbers like 4e-3 are floating-point numbers, so they are accepted. Compiler needs to know the ISO C++11 standard.