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--# -path=.:../prelude
concrete ImperJVM of Imper = open ResImper in {
flags lexer=codevars ; unlexer=code ; startcat=Stm ;
lincat
Rec = {s,s2,s3 : Str} ; -- code, storage for locals, continuation
Stm = Instr ;
lin
Empty = ss [] ;
FunctNil val stm cont = ss (
".method" ++ "public" ++ "static" ++ cont.$0 ++ paren [] ++ val.s ++ ";" ++
".limit" ++ "locals" ++ stm.s2 ++ ";" ++
".limit" ++ "stack" ++ "1000" ++ ";" ++
stm.s ++
".end" ++ "method" ++ ";" ++ ";" ++
cont.s
) ;
Funct args val rec = ss (
".method" ++ "public" ++ "static" ++ rec.$0 ++ paren args.s ++ val.s ++ ";" ++
".limit" ++ "locals" ++ rec.s2 ++ ";" ++
".limit" ++ "stack" ++ "1000" ++ ";" ++
rec.s ++
".end" ++ "method" ++ ";" ++ ";" ++
rec.s3
) ;
RecOne typ stm prg = instrb typ.s (
["alloc"] ++ typ.s ++ stm.$0 ++ stm.s2) {s = stm.s ; s2 = stm.s2 ; s3 = prg.s};
RecCons typ _ body prg = instrb typ.s (
["alloc"] ++ typ.s ++ body.$0 ++ body.s2)
{s = body.s ; s2 = body.s2 ; s3 = prg.s};
Decl typ cont = instrb typ.s (
["alloc"] ++ typ.s ++ cont.$0
) cont ;
Assign t x exp = instrc (exp.s ++ t.s ++ "_store" ++ x.s) ;
While exp loop =
let
test = "TEST_" ++ loop.s2 ;
end = "END_" ++ loop.s2
in instrl (
"label" ++ test ++ ";" ++
exp.s ++
"ifeq" ++ end ++ ";" ++
loop.s ++
"goto" ++ test ++ ";" ++
"label" ++ end
) ;
IfElse exp t f =
let
false = "FALSE_" ++ t.s2 ++ f.s2 ;
true = "TRUE_" ++ t.s2 ++ f.s2
in instrl (
exp.s ++
"ifeq" ++ false ++ ";" ++
t.s ++
"goto" ++ true ++ ";" ++
"label" ++ false ++ ";" ++
f.s ++
"label" ++ true
) ;
Block stm = instrc stm.s ;
Printf t e = instrc (e.s ++ "invokestatic" ++ t.s ++ "runtime/printf" ++ paren (t.s) ++ "v") ;
Return t exp = instr (exp.s ++ t.s ++ "_return") ;
Returnv = instr "return" ;
End = ss [] ** {s2,s3 = []} ;
EVar t x = instr (t.s ++ "_load" ++ x.s) ;
EInt n = instr ("ldc" ++ n.s) ;
EFloat a b = instr ("ldc" ++ a.s ++ "." ++ b.s) ;
EAdd = binopt "_add" ;
ESub = binopt "_sub" ;
EMul = binopt "_mul" ;
ELt t = binop ("invokestatic" ++ t.s ++ "runtime/lt" ++ paren (t.s ++ t.s) ++ "i") ;
EAppNil val f = instr (
"invokestatic" ++ f.s ++ paren [] ++ val.s
) ;
EApp args val f exps = instr (
exps.s ++
"invokestatic" ++ f.s ++ paren args.s ++ val.s
) ;
TNum t = t ;
TInt = ss "i" ;
TFloat = ss "f" ;
NilTyp = ss [] ;
ConsTyp = cc2 ;
OneExp _ e = e ;
ConsExp _ _ = cc2 ;
}
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