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1 files changed, 139 insertions, 0 deletions

diff --git a/asm/asmpars.mly b/asm/asmpars.mly
new file mode 100644
index 0000000..c8f3944
--- /dev/null
+++ b/asm/asmpars.mly
@@ -0,0 +1,139 @@
+%{
+	open Asm
+	
+	let unsigned = function
+		| Addu
+		| Subu
+		| Mulu
+		| Divu
+		| Sltu
+		| Sleu
+		| Jltru
+		| Jleru
+			-> true
+		| _ -> false
+			
+	let pc = ref 0
+	
+	let ram = ref 0x8000
+	
+	let add r i = r := !r + i
+	
+	let lbls2 = ref (Imap.empty)
+	
+	let li u r = function
+		| Imm i ->
+			let c =
+				if u then i < 1 lsl 8
+				else i >= -(1 lsl 7) && i < 1 lsl 7 in
+			if c then (add pc 2; [Lilz (r,Imm i)])
+			else (add pc 4; [Lilz (r,Imm (i land 0x00FF)); Liu (r,Imm ((i land 0xFF00) lsr 8))])
+		| Lab id ->
+			add pc 4; [Lilz (r,Lab id); Liu (r,Labu id)]
+		| _ -> assert false
+		
+	let up = function
+		| Imm i -> Imm i
+		| Lab l -> Labu l
+		| _ -> assert false
+%}
+
+%token EOF,COLON,TEXT,DATA,BYTE,WORD,MINUS,MOVE,JZ,JNZ,LP,RP
+%token POP,PUSH,INCRI,SHI,JJ,JAL,JR,JALR,LW,SW,LB,SB,NOT,LIL,LILZ,LIU,LIUZ,LRA,LI
+%token<Asm.reg> REG
+%token<Asm.fmt_r> ROP,RIOP
+%token<string> ID
+%token<int> INT
+
+%start<Asm.program> program
+
+%%
+
+program:
+	TEXT is=instr* d=data? EOF
+	{ { text = List.flatten is;
+		data = (match d with Some l -> List.flatten l | None -> []);
+		lbls = !lbls2 } }
+	
+data:
+	DATA d=datas* { d }
+	
+datas:
+	| l=label d=datas { lbls2 := Imap.add l !ram !lbls2; d }
+	| BYTE bs=int* { List.map (fun i -> add ram 1; i,false) bs }
+	| WORD bs=int* { List.map (fun i -> add ram 2; i,true) bs }
+	
+label:
+	id=ID COLON { id }
+	
+instr:
+	| l=label i=instr { lbls2 := Imap.add l !pc !lbls2; i }
+	| i=_instr { i }
+	
+_instr:
+	| o=ROP r1=REG r2=REG r3=REG { add pc 2; [R (o,r1,r2,r3)] }
+	| o=RIOP r1=REG r2=REG imm=imm
+		{ let l = li (unsigned o) 5 imm in
+			add pc 2; l @ [R (o,r1,r2,5)] }
+	| INCRI r=REG i=int { 
+		if i >= - (1 lsl 7) && i < 1 lsl 7 then
+			(add pc 2; [Incri (r,i)])
+		else let l = li false 5 (Imm i) in
+			(add pc 2; l @ [R (Add,r,r,5)]) }
+	| SHI r=REG i=int { add pc 2; [Shi (r,i)] }
+	| JJ i=imm { add pc 2; [J i] }
+	| LI r=REG i=imm { li false r i }
+	| JR r=REG { add pc 2; [Jr r] }
+	| JAL i=imm { add pc 2; [Jal i] }
+	| JALR r=REG { add pc 2; [Jalr r] }
+	| LW r1=REG i=int LP r2=REG RP {
+		if i >= - (1 lsl 4) && i < 1 lsl 4 then
+			(add pc 2; [Lw (r1,r2,i)])
+		else let l = li false 5 (Imm i) in
+			(add pc 2; l @ [R (Lwr,r1,r2,5)]) }
+	| SW r1=REG i=int LP r2=REG RP {
+		if i >= - (1 lsl 4) && i < 1 lsl 4 then
+			(add pc 2; [Sw (r1,r2,i)])
+		else let l = li false 5 (Imm i) in
+			(add pc 2; l @ [R (Swr,r1,r2,5)]) }
+	| LB r1=REG i=int LP r2=REG RP {
+		if i >= - (1 lsl 4) && i < 1 lsl 4 then
+			(add pc 2; [Lb (r1,r2,i)])
+		else let l = li false 5 (Imm i) in
+			(add pc 2; l @ [R (Lbr,r1,r2,5)]) }
+	| SB r1=REG i=int LP r2=REG RP {
+		if i >= - (1 lsl 4) && i < 1 lsl 4 then
+			(add pc 2; [Sb (r1,r2,i)])
+		else let l = li false 5 (Imm i) in
+			(add pc 2; l @ [R (Sbr,r1,r2,5)]) }
+	| LW r1=REG l=ID { let l = li false 5 (Lab l) in
+		add pc 2; l @ [Lw (r1,5,0)] }
+	| LB r1=REG l=ID { let l = li false 5 (Lab l) in
+		add pc 2; l @ [Lb (r1,5,0)] }
+	| SW r1=REG l=ID { let l = li false 5 (Lab l) in
+		add pc 2; l @ [Sw (r1,5,0)] }
+	| SB r1=REG l=ID { let l = li false 5 (Lab l) in
+		add pc 2; l @ [Sb (r1,5,0)] }
+	| LRA i=int { assert (i > -(1 lsl 10) && i < 1 lsl 10);
+		add pc 2; [Lra (Imm i)] }
+	| LRA l=ID { add pc 2; [Lra (Lab l)] }
+	| LIL r=REG i=int { add pc 2; [Lil (r,Imm i)] } 
+	| LILZ r=REG i=int { add pc 2; [Lilz (r,Imm i)] }
+	| LIU r=REG i=int { add pc 2; [Liu (r,Imm i)] }
+	| LIUZ r=REG i=int { add pc 2; [Liuz (r,Imm i)] }
+	| MOVE r1=REG r2=REG { add pc 2; [R (Add,r1,r2,0)] }
+	| NOT r1=REG r2=REG { add pc 2; [R (Nor,r1,r2,0)] }
+	| JZ r=REG l=ID { let l = li false 5 (Lab l) in
+		add pc 2; l @ [R (Jer,r,5,0)] }
+	| JNZ r=REG l=ID { let l = li false 5 (Lab l) in
+		add pc 2; l @ [R (Jner,r,5,0)] }
+	| POP r=REG { add pc 4; [Lw (r,7,0); Incri (7,2)] }
+	| PUSH r=REG { add pc 4; [Incri (7,-2); Sw (r,7,0)] }
+	
+imm:
+	| id=ID { Lab id }
+	| n=int { Imm n }
+
+int:
+	| n=INT { n }
+	| MINUS n=INT { - n }