Asm file syntax

Pseudo grammar:

intval: (just number, forget about grammar:)
delimited_string: (any data including newlines ended with '~')
word: (one word - delimiter is space )
label: (word starting with ':')

asmfile: *{asmentry} end_marker

end_marker: '!end'

asmentry: extern_const_def |
          fun_def

extern_conts_def: '!constant' const_entry

const_entry: const_type const_arguments

const_type: 'string'

const_arguments: intval |
           delimited_string

fun_def: '!funstart' word *{insidefun} '!funend'

insidefun: mnemonic |
           label mnemonic

menmonic: word arguments

arguments: (various things depending on mnemonic - see below)



-----

LABEL - word starting with ':'
Normally we are used to labels with : at end, but due to cost of strlen
it is easier to parse them when they are at first place (mudasm isn't
designed to be generated by hand)
It is possible to put many labels at one place.
Examples:

!funstart some_fun
	:LABEL1 pushi -5
	   pushi 5 
	:flowER :NEXTLABEL :YET_ANOTHER_LABEL eval
	jmp a LABEL1
!funend

Labels are valid only in scope of defining fun.
It is allowed to give label which is not used anywhere, but jumping to label
which isn't defined until end of fun will result in error.

---

LOCAL VARIABLES
// have to write help :(
// short for now


	!A dword argint1
	!A string argstr1
	!L dword vint1
	!L dword somei
	!L string blurp
	pushc string Hello world~
	popl @blurp			#referenced blurp local variable - equals popl 4
	movi @vint1 100		#same as pushi 100; popl 2