If Parser

[Colin]

Hello pstudio, thanks for your reply, your idea is very good, my language already supports if etc and many data types, whiles, fors, repeats, pretty much everything of a modern language, however for my purpose it kind of defeats the point of the language. In your example variables would need to be changed or at the least memory would be used to create a temporary storage for doing the comparison, the idea really is to allow the programmer to know and understand exactly what his code will produce at the same time making it easier to write.

In theory this idea is pretty good but the registers would be changed without the programmer knowing defeating the point and would produce alot of extra code

all of the following:

r0 := edx = 1      // edx == 1

are still cmp's.

so imagine

//al as r0
al = (edx = 1);

cmp edx, 1
setz al

setz instruction basically does the following: set al if the compare is equal


Overall the overhead of a few small jne/je/jnc/jc etc is worth it over memory operations.


My current if parser is just a forward generator, a brute force recursive procedure. Thanks again for your interest and input. I hope to hear some more good ideas

just to show what i look for exactly... my code can handle complex if/while/for statements already so:

if ((eax != 1) and ((ecx == 2) or ((edx == 3) and (edi == 0))) and (ebx =< 22) and (esi == 12)) {
	ShowMessageA('Sample', 'Hello World!');
}

this already is assembled into machine code correct, which is equivalent to:

  		cmp	eax,00000001h
  		jz 	L00403041
  		cmp	ecx,00000002h
  		jz 	L00403028
  		cmp	edx,00000003h
  		jnz	L00403041
  		cmp	edi,00000000h
  		jnz	L00403041
 L00403028:
  		cmp	ebx,00000016h
  		ja 	L00403041
  		cmp	esi,0000000Ch
  		jnz	L00403041
  		push	_Hello_World_
  		push	_Sample_
  		call	SUB_L004030A6
 L00403041:

so that is works is not a problem, but i just would like to see the different ideas on how they believe it should be done, and if someone comes up with an idea that will be faster/better for optimization that would be superb