CODEGEN.SLC is a simple parser that accepts an expression from input and writes 80x86 compatible assembly code to output. In this case, CODEGEN.SLC has been compiled to CODEGEN.COM and is being run under a DOS emulator, with your expression "stuffed" into the input.

executing "codegen" via DOSCMD and stuffing data "(a * b) - 5" to STDIN...

> (a * b) - 5
; (a * b) - 5
	mov	ax,a
	push	ax
	mov	ax,b
	mov	bx,ax
	pop	ax
	mul	bx
	push	ax
	mov	ax,5
	mov	bx,ax
	pop	ax
	sub	ax,bx

> 
; 

Bye!

Notes:
  • Lines starting with ">" are the stuffed input. Lines starting with ";" are comments in the output.
  • If this code was assembled and executed, the result would be in AX.
  • Yes, this is really the output of a DOS executable running on a FreeBSD (unix) web server!


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