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grammar.ebnf: Commit incomplete grammar description

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John 2024-01-30 05:29:25 -06:00
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(* Partical grammar for msp430-asm *)
Line = Label | Directive | Insn ;
Insn = NoEm | OneEm | Special | OneArg | TwoArg | Jump ;
(* Instruction formats *)
NoEm = OpNoEm ;
OneEm = OpOneEm Dst ;
Special = "reti" | "br" Src ;
OneArg = OpOneArg Src ;
TwoArg = OpTwoArg Src ','? Dst ;
Jump = OpJump Expr ;
(* Addressing modes *)
Src = '#' (SrcSpecial | '-'? Expr)
| Absolute
| PostInc
| Indexed
| Direct ;
Dst = '#' (SrcSpecial | Expr)
| Absolute
| Indirect
| Indexed
| Direct ;
Direct = Reg ;
Indirect = '@' Reg ;
PostInc = Indirect '+'? ;
Indexed = Number '(' Reg ')' ;
Immediate = '#' Expr ;
Absolute = '&' Expr ;
SrcSpecial = 0 | 1 | '-' 1 | 0xffff | 2 | 4 | 8 ;
DstSpecial = 0 | 1 ;
Expr = '-'? Number ;
(* Pseudo-terminals *)
Reg = "pc" | "sp" | "sr" | "cg"
| "r0" | "r1" | "r2" | "r3"
| "r4" | "r5" | "r6" | "r7"
| "r8" | "r9" | "r10" | "r11"
| "r12" | "r13" | "r14" | "r15" ;
Identifier = ID_START ID_CONTINUE* ;
Number = '-'? DIGIT ;