-(* L1 Compiler
+(* L3 Compiler
* AST -> IR Translator
* Author: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
* Modified by: Alex Vaynberg <alv@andrew.cmu.edu>
* Modified: Frank Pfenning <fp@cs.cmu.edu>
+ * Modified: Chris Lu <czl@andrew.cmu.edu>
+ * Modified: Joshua Wise <jwise@andrew.cmu.edu>
*)
signature TRANS =
sig
(* translate abstract syntax tree to IR tree *)
- val translate : Ast.program -> Tree.stm list
+ val translate : Ast.program -> Tree.program
end
structure Trans :> TRANS =
structure A = Ast
structure T = Tree
-
+
fun trans_oper A.PLUS = T.ADD
| trans_oper A.MINUS = T.SUB
| trans_oper A.TIMES = T.MUL
| trans_oper A.DIVIDEDBY = T.DIV
| trans_oper A.MODULO = T.MOD
- | trans_oper A.NEGATIVE = T.SUB (* unary to binary! *)
-
- and trans_exp env (A.Var(id)) =
- (* after type-checking, id must be declared; do not guard lookup *)
- T.TEMP (Symbol.look' env id)
- | trans_exp env (A.ConstExp c) = T.CONST(c)
- | trans_exp env (A.OpExp(oper, [e1, e2])) =
- T.BINOP(trans_oper oper, trans_exp env e1, trans_exp env e2)
- | trans_exp env (A.OpExp(A.NEGATIVE, [e])) =
- T.BINOP(trans_oper A.NEGATIVE, T.CONST(Word32Signed.ZERO), trans_exp env e)
- | trans_exp env (A.Marked(marked_exp)) =
- trans_exp env (Mark.data marked_exp)
- (* anything else should be impossible *)
-
- (* translate the statement *)
- (* trans_stms : Temp.temp Symbol.table -> A.stm list -> Tree.stm list *)
- fun trans_stms env (A.Assign(id,e)::stms) =
- let val t = Temp.new()
- val env' = Symbol.bind env (id, t)
- in
- T.MOVE(T.TEMP(t), trans_exp env e)
- :: trans_stms env' stms
- end
- | trans_stms env (A.Return e::nil) =
- (* after type-checking, return must be last statement *)
- T.RETURN (trans_exp env e) :: nil
-
- fun translate p = trans_stms Symbol.empty p
+ | trans_oper A.LSH = T.LSH
+ | trans_oper A.RSH = T.RSH
+ | trans_oper A.LOGOR = T.LOGOR
+ | trans_oper A.LOGAND = T.LOGAND
+ | trans_oper A.BITOR = T.BITOR
+ | trans_oper A.BITXOR = T.BITXOR
+ | trans_oper A.BITAND = T.BITAND
+ | trans_oper A.NEQ = T.NEQ
+ | trans_oper A.EQ = T.EQ
+ | trans_oper A.LT = T.LT
+ | trans_oper A.LE = T.LE
+ | trans_oper A.GE = T.GE
+ | trans_oper A.GT = T.GT
+ | trans_oper _ = raise ErrorMsg.InternalError "expected AST binop, got AST unop"
+
+ fun translate (defs, funcs) =
+ let
+ val funclist = Symbol.elemsi funcs
+ val _ = Type.alignment_reset()
+ val _ = Type.sizeof_reset()
+ fun sizeof a = Type.sizeof defs a
+ fun alignment a = Type.alignment defs a
+ fun align t curpos = Type.align defs t curpos
+
+ fun offset_s id (Type.Typedef(id')) =
+ let
+ val shit = Symbol.look' defs id'
+ fun eat (Type.Struct(l)) = l
+ | eat (Type.MarkedTypedef(a)) = eat (Mark.data a)
+ fun offset_s' ((id1,t)::l') curofs =
+ let
+ val a = align t curofs
+ in
+ if Symbol.compare(id,id1) = EQUAL
+ then a
+ else offset_s' l' (a + sizeof t)
+ end
+ | offset_s' nil _ = raise ErrorMsg.InternalError "looking for offset of something that isn't in the structure"
+ in
+ offset_s' (eat shit) 0
+ end
+ | offset_s _ _ = raise ErrorMsg.InternalError "cannot find offset into non-typedef"
+
+ fun type_s id (Type.Typedef id') =
+ let
+ val td =
+ case Type.defdata (Symbol.look' defs id')
+ of Type.Struct d => d
+ | _ => raise ErrorMsg.InternalError "data didn't return struct"
+ fun type_s' ((id',t)::l) =
+ if (Symbol.compare (id, id') = EQUAL)
+ then t
+ else type_s' l
+ | type_s' nil = raise ErrorMsg.InternalError "struct member not found in type_s"
+ in
+ type_s' td
+ end
+ | type_s id _ = raise ErrorMsg.InternalError "cannot find internal type non-typedef"
+
+ fun deref (Type.Pointer i) = i
+ | deref (Type.Array i) = i
+ | deref _ = raise ErrorMsg.InternalError "cannot deref non-pointer"
+
+ fun trans_unop A.NEGATIVE = T.NEG
+ | trans_unop A.BITNOT = T.BITNOT
+ | trans_unop A.BANG = T.BANG
+ | trans_unop _ = raise ErrorMsg.InternalError "expected AST unop, got AST binop"
+
+ fun typeof' vartypes exp = TypeChecker.typeof (defs, funcs) vartypes NONE exp
+
+ fun trans_exp env vartypes (A.Var(id)) =
+ (* after type-checking, id must be declared; do not guard lookup *)
+ T.TEMP (Symbol.look' env id)
+ | trans_exp env vartypes (A.Cast (ty, e)) = trans_exp env vartypes e (* lurrr *)
+ | trans_exp env vartypes (A.ConstExp c) = T.CONST(c)
+ | trans_exp env vartypes (A.StringExp s) = T.STRING(Stringref.new s)
+ | trans_exp env vartypes (A.OpExp(oper, [e1, e2])) =
+ T.BINOP(trans_oper oper, trans_exp env vartypes e1, trans_exp env vartypes e2)
+ | trans_exp env vartypes (A.OpExp(oper, [e])) =
+ T.UNOP(trans_unop oper, trans_exp env vartypes e)
+ | trans_exp env vartypes (A.OpExp(oper, _)) =
+ raise ErrorMsg.InternalError "expected one or two operands, got it in the oven"
+ | trans_exp env vartypes (A.Marked(marked_exp)) =
+ trans_exp env vartypes (Mark.data marked_exp)
+ | trans_exp env vartypes (A.FuncCall(func, stms)) =
+ T.CALL(func,
+ List.map
+ (fn exp => (trans_exp env vartypes exp))
+ stms)
+ | trans_exp env vartypes (A.Member (exp, id)) =
+ let
+ val apk = T.BINOP (T.ADD, trans_exp env vartypes exp, T.CONST (Word32.fromInt (offset_s id (typeof' vartypes exp))))
+ val tipo = type_s id (typeof' vartypes exp)
+ in
+ if Type.issmall tipo
+ then T.MEMORY(apk)
+ else apk
+ end
+ | trans_exp env vartypes (A.DerefMember (exp, id)) =
+ trans_exp env vartypes (A.Member (A.Dereference (exp), id))
+ | trans_exp env vartypes (A.Dereference(exp)) =
+ if (Type.issmall (deref (typeof' vartypes exp)))
+ then T.MEMORY(trans_exp env vartypes exp)
+ else trans_exp env vartypes exp
+ | trans_exp env vartypes (A.ArrIndex(exp1, exp2)) =
+ let
+ val asubk = T.BINOP(T.ADD, trans_exp env vartypes exp1,
+ if sizeof (deref (typeof' vartypes exp1)) = 1
+ then trans_exp env vartypes exp2
+ else T.BINOP(T.MUL, trans_exp env vartypes exp2,
+ T.CONST(Word32.fromInt(sizeof (deref (typeof' vartypes exp1))))
+ )
+ )
+ val tipo = deref (typeof' vartypes exp1)
+ val d =
+ if not (Flag.isset Flags.safe)
+ then asubk
+ else T.COND (T.BINOP
+ (T.BE,
+ T.MEMORY (T.BINOP (
+ T.SUB,
+ trans_exp env vartypes exp1,
+ T.CONST 0w8)),
+ trans_exp env vartypes exp2),
+ T.NULLPTR,
+ asubk)
+ in
+ if Type.issmall tipo
+ then T.MEMORY(d)
+ else d
+ end
+ | trans_exp env vartypes (A.New(tipo)) =
+ let
+ val t1 = T.TEMP (Temp.new "result")
+ in
+ T.STMVAR (
+ [T.MOVE (t1, T.ALLOC (T.CONST (Word32.fromInt(sizeof tipo)))),
+ T.EFFECT (T.MEMORY (t1))],
+ t1)
+ end
+ | trans_exp env vartypes (A.NewArr(tipo, exp)) =
+ let
+ val size = if (sizeof tipo) = 1
+ then trans_exp env vartypes exp
+ else T.BINOP(T.MUL, trans_exp env vartypes exp, T.CONST(Word32.fromInt(sizeof tipo)))
+ val t1 = T.TEMP (Temp.new "allocated address")
+ val ts = T.TEMP (Temp.new "size")
+ in
+ if not (Flag.isset Flags.safe)
+ then T.STMVAR ([T.MOVE (t1, T.ALLOC size),
+ T.EFFECT (T.COND (T.BINOP (T.EQ, trans_exp env vartypes exp, T.CONST 0w0), T.CONST 0w0, T.MEMORY (t1)))],
+ t1)
+ else T.COND (T.BINOP(T.EQ, size, T.CONST 0w0),
+ T.NULLPTR,
+ T.STMVAR (
+ [T.MOVE(t1,
+ T.COND(
+ T.BINOP(T.LT, size, T.CONST 0w0),
+ T.NULLPTR,
+ T.ALLOC (T.BINOP (T.ADD, size, T.CONST 0w8)))
+ ),
+ T.MOVE(T.MEMORY (t1), trans_exp env vartypes exp)],
+ T.BINOP(T.ADD, t1, T.CONST 0w8)))
+ end
+ | trans_exp env vartypes (A.Null) = T.NULLPTR
+ | trans_exp env vartypes (A.Conditional(c,e1,e2)) = T.COND(trans_exp env vartypes c, trans_exp env vartypes e1, trans_exp env vartypes e2)
+
+ (* anything else should be impossible *)
+
+ (* trans_stms : Temp.temp Symbol.table -> (Label.label * Label.label) option -> A.stm list -> Tree.stm list
+ * translates a statement to the corresponding IR
+ * we pass around the environment and the current loop context, if any
+ * (usually called ls, which contains a continue label and a break label)
+ *)
+ fun trans_stms vars vartypes ls (A.Assign(e1,e2)::stms) = T.MOVE(trans_exp vars vartypes e1, trans_exp vars vartypes e2)::(trans_stms vars vartypes ls stms)
+ | trans_stms vars vartypes ls (A.AsnOp(oop,e1,e2)::stms) =
+ let
+ val te1 = trans_exp vars vartypes e1
+ val te2 = trans_exp vars vartypes e2
+ val t1 = T.TEMP (Temp.new "memory deref cache")
+ in
+ case te1
+ of T.MEMORY(m) => T.MOVE(t1, m) :: T.MOVE (T.MEMORY(t1), T.BINOP(trans_oper oop, T.MEMORY(t1), te2)) :: (trans_stms vars vartypes ls stms)
+ | _ => T.MOVE(te1, T.BINOP(trans_oper oop, te1, te2)) :: (trans_stms vars vartypes ls stms)
+ end
+ | trans_stms vars vartypes ls (A.Return e::stms) =
+ let
+ val remainder = trans_stms vars vartypes ls stms
+ in
+ T.RETURN (trans_exp vars vartypes e)
+ :: remainder
+ end
+ | trans_stms vars vartypes ls (A.If(e, s, NONE)::stms) =
+ let
+ val l = Label.new ()
+ val strans = trans_stms vars vartypes ls s
+ val remainder = trans_stms vars vartypes ls stms
+ in
+ (T.JUMPIFN(trans_exp vars vartypes e, l)
+ :: strans
+ @ [T.LABEL (l)]
+ @ remainder)
+ end
+ | trans_stms vars vartypes ls (A.If(e, s, SOME s2)::stms) =
+ let
+ val l = Label.new ()
+ val l2 = Label.new ()
+ val s1trans = trans_stms vars vartypes ls s
+ val s2trans = trans_stms vars vartypes ls s2
+ val remainder = trans_stms vars vartypes ls stms
+ in
+ (T.JUMPIFN(trans_exp vars vartypes e, l)
+ :: s1trans
+ @ [T.JUMP (l2), T.LABEL (l)]
+ @ s2trans
+ @ [T.LABEL (l2)]
+ @ remainder)
+ end
+ | trans_stms vars vartypes ls (A.For(s1, e, s2, s)::stms) =
+ let
+ val head = Label.new ()
+ val tail = Label.new ()
+ val loop = Label.new ()
+ val stm1 = if isSome s1 then trans_stms vars vartypes NONE [valOf s1] else nil
+ val strans = trans_stms vars vartypes (SOME(loop,tail)) s
+ val stm2 = if isSome s2 then trans_stms vars vartypes NONE [valOf s2] else nil
+ val remainder = trans_stms vars vartypes ls stms
+ in
+ (stm1
+ @ [T.LABEL head, T.JUMPIFN(trans_exp vars vartypes e, tail)]
+ @ strans
+ @ [T.LABEL loop]
+ @ stm2
+ @ [T.JUMP head, T.LABEL tail]
+ @ remainder)
+ end
+ | trans_stms vars vartypes ls (A.While(e, s)::stms) =
+ let
+ val head = Label.new ()
+ val tail = Label.new ()
+ val strans = trans_stms vars vartypes (SOME(head,tail)) s
+ val remainder = trans_stms vars vartypes ls stms
+ in
+ (T.LABEL head
+ :: T.JUMPIFN(trans_exp vars vartypes e, tail)
+ :: strans
+ @ [T.JUMP head, T.LABEL tail]
+ @ remainder)
+ end
+ | trans_stms vars vartypes ls (A.Effect(e)::stms) = (T.EFFECT (trans_exp vars vartypes e)) :: (trans_stms vars vartypes ls stms)
+ | trans_stms vars vartypes (SOME(b,e)) (A.Break::stms) =
+ let
+ val remainder = trans_stms vars vartypes (SOME(b,e)) stms
+ in
+ ((T.JUMP e) :: remainder)
+ end
+ | trans_stms vars vartypes NONE (A.Break::_) = raise ErrorMsg.InternalError "Break from invalid location... should have been caught in typechecker"
+ | trans_stms vars vartypes (SOME(b,e)) (A.Continue::stms) =
+ let
+ val remainder = trans_stms vars vartypes (SOME(b,e)) stms
+ in
+ ((T.JUMP b) :: remainder)
+ end
+ | trans_stms vars vartypes NONE (A.Continue::_) = raise ErrorMsg.InternalError "Continue from invalid location... should have been caught in typechecker"
+ | trans_stms vars vartypes ls (A.Nop::stms) = trans_stms vars vartypes ls stms
+ | trans_stms vars vartypes ls (A.MarkedStm m :: stms) = trans_stms vars vartypes ls ((Mark.data m) :: stms)
+ | trans_stms vars vartypes _ nil = nil
+
+ fun trans_funcs ((id, A.Extern(_, _))::l) = trans_funcs l
+ | trans_funcs ((id, A.MarkedFunction a)::l) = trans_funcs ((id, Mark.data a)::l)
+ | trans_funcs ((id, A.Function(t, args, vars, body))::l) =
+ let
+ val allvars = foldr
+ (fn ((name, t),b) =>
+ Symbol.bind b (name, Temp.new (Symbol.name(name))))
+ Symbol.empty
+ (args @ vars)
+ val vartypes = foldr (fn ((i, t), b) => Symbol.bind b (i, t)) Symbol.empty (args @ vars)
+ val b = trans_stms allvars vartypes NONE body
+ val (argn,_) = ListPair.unzip args
+ val numberedargs = ListPair.zip (List.tabulate (length argn, fn x => x), argn)
+ val argmv = map
+ (fn (n, argname) => T.MOVE(T.TEMP (Symbol.look' allvars argname), T.ARG (n)))
+ numberedargs
+ in
+ (T.FUNCTION(id, argmv @ b)) :: (trans_funcs l)
+ end
+ | trans_funcs nil = nil
+ in
+ trans_funcs funclist
+ end
end
git.joshuawise.com / snipe.git / blobdiff