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eval.sml
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eval.sml
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(* -*- mode: sml; mode: font-lock; tab-width: 4; insert-tabs-mode: nil; indent-tabs-mode: nil -*- *)
structure Eval = struct
(* Local tracing machinery *)
val traceStack = ref false
val (stack:string list list ref) = ref []
fun resetStack _ =
stack := []
val ArrayClassIdentity = ref (~1)
val FunctionClassIdentity = ref (~1)
fun join sep ss =
case ss of
[] => ""
| [x] => x
| x :: xs => x ^ sep ^ (join sep xs)
fun stackString _ =
"[" ^ (join " | " (map String.concat (List.rev (!stack)))) ^ "]"
fun push ss =
(stack := (ss) :: (!stack);
if !traceStack
then LogErr.log ("[stack] " :: [stackString ()])
else ())
fun pop _ =
(stack := tl (!stack);
if !traceStack
then LogErr.log ("[stack] " :: [stackString()])
else ())
fun log ss = LogErr.log ("[eval] " :: ss)
val doTrace = ref false
fun fmtName n = if (!doTrace) then LogErr.name n else ""
fun fmtMultiname n = if (!doTrace) then LogErr.multiname n else ""
fun trace ss = if (!doTrace) then log ss else ()
fun error ss =
(LogErr.log ("[stack] " :: [stackString()]);
LogErr.evalError ss)
(* Exceptions for object-language control transfer. *)
exception ContinueException of (Ast.IDENT option)
exception BreakException of (Ast.IDENT option)
exception TailCallException of (unit -> Mach.VAL)
exception ThrowException of Mach.VAL
exception ReturnException of Mach.VAL
exception InternalError
fun mathOp (v:Mach.VAL)
(decimalFn:(Decimal.DEC -> 'a) option)
(doubleFn:(Real64.real -> 'a) option)
(intFn:(Int32.int -> 'a) option)
(uintFn:(Word32.word -> 'a) option)
(default:'a)
: 'a =
let
fun fnOrDefault fo v = case fo of
NONE => default
| SOME f => f v
in
case v of
Mach.Object (Mach.Obj ob) =>
(case !(#magic ob) of
SOME (Mach.Decimal d) => fnOrDefault decimalFn d
| SOME (Mach.Double d) => fnOrDefault doubleFn d
| SOME (Mach.Int i) => fnOrDefault intFn i
| SOME (Mach.UInt u) => fnOrDefault uintFn u
| _ => default)
| _ => default
end
fun extendScope (p:Mach.SCOPE)
(ob:Mach.OBJ)
(kind:Mach.SCOPE_KIND)
: Mach.SCOPE =
Mach.Scope { parent = (SOME p),
object = ob,
temps = ref [],
kind = kind }
fun extendScopeReg (r:Mach.REGS)
(ob:Mach.OBJ)
(kind:Mach.SCOPE_KIND)
: Mach.REGS =
let
val {scope,this} = r
in
{scope=extendScope scope ob kind,
this=this}
end
fun getObjId (obj:Mach.OBJ)
: Mach.OBJ_IDENT =
case obj of
Mach.Obj { ident, ... } => ident
fun getScopeObj (scope:Mach.SCOPE)
: Mach.OBJ =
case scope of
Mach.Scope { object, ... } => object
fun getScopeId (scope:Mach.SCOPE)
: Mach.OBJ_IDENT = getObjId (getScopeObj scope)
fun getScopeTemps (scope:Mach.SCOPE)
: Mach.TEMPS =
case scope of
Mach.Scope { temps, ... } => temps
fun needNamespace (v:Mach.VAL)
: Ast.NAMESPACE =
case v of
Mach.Object (Mach.Obj ob) =>
(case !(#magic ob) of
SOME (Mach.Namespace n) => n
| _ => error ["need namespace"])
| _ => error ["need namespace"]
fun needObj (v:Mach.VAL)
: Mach.OBJ =
case v of
Mach.Object ob => ob
| _ => error ["need object"]
(*
* The global object and scope.
*)
val (globalObject:(Mach.OBJ option) ref) = ref NONE
val (globalScope:(Mach.SCOPE option) ref) = ref NONE
fun getGlobalObject _
: Mach.OBJ =
case !globalObject of
NONE => error ["missing global object"]
| SOME ob => ob
fun getGlobalScope _
: Mach.SCOPE =
case !globalScope of
NONE => error ["missing global scope"]
| SOME ob => ob
fun getInitialRegs _ =
{ this = getGlobalObject (),
scope = getGlobalScope () }
(*
* A small number of functions do not fully evaluate to Mach.VAL
* values, but instead to REFs; these are temporary artifacts of
* evaluation, not first-class values in the language.
*)
type REF = (Mach.OBJ * Ast.NAME)
(* Fundamental object methods *)
(* FIXME: possibly move this to mach.sml *)
fun allocFixtures (regs:Mach.REGS)
(obj:Mach.OBJ)
(this:Mach.OBJ option)
(temps:Mach.TEMPS)
(f:Ast.FIXTURES)
: unit =
case obj of
Mach.Obj { props, ident, ... } =>
let
val _ = trace ["allocating fixtures on object id #", Int.toString ident]
val {scope, ...} = regs
val methodScope = extendScope scope obj Mach.ActivationScope
fun valAllocState (t:Ast.TYPE_EXPR)
: Mach.PROP_STATE =
(* Every value fixture has a type, and every type has an
* associated "allocated state". Note that
* this is *not* the same as saying that every type
* has an associated default value; for *some* types
* the allocated state is a default value; for
* types that are non-nullable, however, the allocated
* state is Mach.UninitProp. This property
* state should never be observable to a user. It is
* always a hard error to read a property in
* Mach.UninitProp state, and it is always a hard
* error to complete the initialization phase of an
* object with any properties remaining in
* Mach.UninitProp state. *)
case t of
Ast.SpecialType (Ast.Any) =>
Mach.ValProp (Mach.Undef)
| Ast.SpecialType (Ast.Null) =>
Mach.ValProp (Mach.Null)
| Ast.SpecialType (Ast.Undefined) =>
Mach.ValProp (Mach.Undef)
| Ast.SpecialType (Ast.VoidType) =>
error ["attempt to allocate void-type property"]
(* FIXME: is this correct? Maybe we need to check them all to be nullable? *)
| Ast.UnionType _ =>
Mach.ValProp (Mach.Null)
| Ast.ArrayType _ =>
Mach.ValProp (Mach.Null)
| Ast.TypeName ident =>
(* FIXME: resolve nominal type to class or interface, check to see if
* it is nullable, *then* decide whether to set to null or uninit. *)
Mach.ValProp (Mach.Null)
| Ast.FunctionType _ =>
Mach.UninitProp
| Ast.ObjectType _ =>
Mach.ValProp (Mach.Null)
| Ast.AppType {base, ...} =>
valAllocState base
| Ast.NullableType { expr, nullable=true } =>
Mach.ValProp (Mach.Null)
| Ast.NullableType { expr, nullable=false } =>
Mach.UninitProp
| Ast.ElementTypeRef _ =>
Mach.ValProp (Mach.Undef) (* FIXME: should get the type of the element from the array type *)
| Ast.FieldTypeRef _ => (* FIXME: get type from object type *)
Mach.ValProp (Mach.Undef)
| _ => error ["Shouldn't happen: failed to match in Eval.allocFixtures#valAllocState."]
fun tempPadding n =
if n = 0
then []
else (Ast.SpecialType Ast.Any, Mach.UninitTemp)::(tempPadding (n-1))
fun allocFixture (n, f) =
case n of
Ast.TempName t =>
(case f of
Ast.ValFixture { ty, ... } => (* FIXME: temp types are not needed, use the value tag for rt typechecking *)
(if t = (List.length (!temps))
then (trace ["allocating fixture for temporary ", Int.toString t];
temps := (Ast.SpecialType Ast.Any, Mach.UninitTemp)::(!temps))
else if t < (List.length (!temps))
then (trace ["ignoring fixture, already allocated ", Int.toString t];
temps := (List.take (!temps,((length (!temps))-t-1)))@((ty, Mach.UninitTemp)::(List.drop (!temps,(length (!temps)-t)))))
else (trace ["allocating fixtures for temporaries ", Int.toString (length (!temps)), " to ", Int.toString t];
temps := (Ast.SpecialType Ast.Any, Mach.UninitTemp)
::(((tempPadding (t-(length (!temps))))@(!temps)))))
| _ => error ["allocating non-value temporary"])
| Ast.PropName pn =>
let
val _ = trace ["allocating fixture for property ", fmtName pn]
fun allocProp state p =
if Mach.hasProp props pn
then error ["allocating duplicate property name: ",
fmtName pn]
else (trace ["allocating fixture for ", state, " property ",
fmtName pn];
Mach.addProp props pn p)
in
case f of
Ast.TypeFixture te =>
allocProp "type"
{ ty = te,
state = Mach.TypeProp,
attrs = { dontDelete = true,
dontEnum = true,
readOnly = true,
isFixed = true } }
| Ast.MethodFixture { func, ty, readOnly, ... } =>
let
val Ast.Func { isNative, ... } = func
val p = if isNative
then Mach.NativeFunctionProp (Mach.getNativeFunction pn)
else Mach.MethodProp (newFunClosure methodScope func this)
in
allocProp "method"
{ ty = ty,
state = p,
attrs = { dontDelete = true,
dontEnum = true,
readOnly = readOnly,
isFixed = true } }
end
| Ast.ValFixture { ty, readOnly, ... } =>
allocProp "value"
{ ty = ty,
state = valAllocState ty,
attrs = { dontDelete = true,
dontEnum = false,
readOnly = readOnly,
isFixed = true } }
| Ast.VirtualValFixture { ty, getter, setter, ... } =>
let
val getFn = case getter of
NONE => NONE
| SOME f => SOME (newFunClosure methodScope (#func f) this)
val setFn = case setter of
NONE => NONE
| SOME f => SOME (newFunClosure methodScope (#func f) this)
in
allocProp "virtual value"
{ ty = ty,
state = Mach.VirtualValProp { getter = getFn,
setter = setFn },
attrs = { dontDelete = true,
dontEnum = false,
readOnly = true,
isFixed = true } }
end
| Ast.ClassFixture cls =>
let
val Ast.Cls {classFixtures, ...} = cls
val _ = trace ["allocating class object for class ", fmtName pn]
val classObj = needObj (newClass scope cls)
val _ = trace ["allocating class fixtures on class ", fmtName pn]
(* FIXME: 'this' binding in class objects might be wrong here. *)
val _ = allocObjFixtures regs classObj NONE classFixtures
in
allocProp "class"
{ ty = (Name.typename Name.public_Class),
state = Mach.ValProp (Mach.Object classObj),
attrs = { dontDelete = true,
dontEnum = true,
readOnly = true,
isFixed = true } }
end
| Ast.NamespaceFixture ns =>
allocProp "namespace"
{ ty = (Name.typename Name.public_Namespace),
state = Mach.NamespaceProp ns,
attrs = { dontDelete = true,
dontEnum = true,
readOnly = true,
isFixed = true } }
| Ast.TypeVarFixture =>
allocProp "type variable"
{ ty = (Name.typename Name.public_Type),
state = Mach.TypeVarProp,
attrs = { dontDelete = true,
dontEnum = true,
readOnly = true,
isFixed = true } }
| Ast.InterfaceFixture => (* FIXME *)
()
(* | _ => error ["Shouldn't happen: failed to match in Eval.allocFixtures#allocFixture."] *)
end
in
List.app allocFixture f
end
and allocObjFixtures (regs:Mach.REGS)
(obj:Mach.OBJ)
(this:Mach.OBJ option)
(f:Ast.FIXTURES)
: unit =
let
val (temps:Mach.TEMPS) = ref []
in
allocFixtures regs obj this temps f;
if not ((length (!temps)) = 0)
then error ["allocated temporaries in non-scope object"]
else ()
end
and allocScopeFixtures (regs:Mach.REGS)
(f:Ast.FIXTURES)
: unit =
case (#scope regs) of
Mach.Scope { object, temps, ... } =>
allocFixtures regs object NONE temps f
and hasOwnValue (obj:Mach.OBJ)
(n:Ast.NAME)
: bool =
case obj of
Mach.Obj { props, ... } =>
Mach.hasProp props n
and hasValue (obj:Mach.OBJ)
(n:Ast.NAME)
: bool =
if hasOwnValue obj n
then true
else (case obj of
Mach.Obj { proto, ... } =>
case (!proto) of
Mach.Object p => hasValue p n
| _ => false)
(*
* *Similar to* ES3 8.7.1 GetValue(V), there's
* no Reference type in ES4.
*)
and getValueOrVirtual (obj:Mach.OBJ)
(name:Ast.NAME)
(doVirtual:bool)
: Mach.VAL =
let
val Mach.Obj { props, ... } = obj
in
case Mach.findProp props name of
SOME prop =>
(case (#state prop) of
Mach.TypeProp =>
error ["getValue on a type property: ",
fmtName name]
| Mach.TypeVarProp =>
error ["getValue on a type variable property: ",
fmtName name]
| Mach.UninitProp =>
error ["getValue on an uninitialized property: ",
fmtName name]
| Mach.VirtualValProp { getter, ... } =>
if doVirtual
then
case getter of
SOME g =>
invokeFuncClosure obj g []
| NONE =>
error ["getValue on a virtual property w/o getter: ",
fmtName name]
else
(* FIXME: possibly throw here? *)
Mach.Undef
| Mach.NamespaceProp n =>
newNamespace n
| Mach.NativeFunctionProp nf =>
newNativeFunction nf
| Mach.MethodProp closure =>
newFunctionFromClosure closure
| Mach.ValListProp vals =>
newArray vals
| Mach.ValProp v => v)
| NONE =>
if Mach.hasProp props Name.meta_get
then
let
(* FIXME: no idea if this is correct behavior for meta::get *)
val metaGetFn = needObj (getValueOrVirtual obj Name.meta_get false)
val nameObj = (* FIXME: need a builtin Name.es object here. *)
newString (#id name)
in
evalCallExpr obj metaGetFn [nameObj]
end
else
Mach.Undef
end
and getValue (obj:Mach.OBJ)
(name:Ast.NAME)
: Mach.VAL =
getValueOrVirtual obj name true
and setValueOrVirtual (base:Mach.OBJ)
(name:Ast.NAME)
(v:Mach.VAL)
(doVirtual:bool)
: unit =
let
val Mach.Obj { props, ... } = base
in
case Mach.findProp props name of
SOME existingProp =>
let
val existingAttrs = (#attrs existingProp)
val newProp = { state = Mach.ValProp v,
ty = (#ty existingProp),
attrs = existingAttrs }
fun write _ =
((* FIXME: insert typecheck here *)
Mach.delProp props name;
Mach.addProp props name newProp)
in
case (#state existingProp) of
Mach.UninitProp =>
error ["setValue on uninitialized property",
fmtName name]
| Mach.TypeVarProp =>
error ["setValue on type variable property:",
fmtName name]
| Mach.TypeProp =>
error ["setValue on type property: ",
fmtName name]
| Mach.NamespaceProp _ =>
error ["setValue on namespace property: ",
fmtName name]
| Mach.NativeFunctionProp _ =>
error ["setValue on native function property: ",
fmtName name]
| Mach.MethodProp _ =>
error ["setValue on method property: ",
fmtName name]
| Mach.ValListProp _ =>
error ["setValue on value-list property: ",
fmtName name]
| Mach.VirtualValProp { setter = SOME s, ... } =>
if doVirtual
then (invokeFuncClosure base s [v]; ())
else write ()
| Mach.VirtualValProp { setter = NONE, ... } =>
if doVirtual
then error ["setValue on virtual property w/o setter: ",
fmtName name]
else write ()
| Mach.ValProp _ =>
if (#readOnly existingAttrs)
then () (* ignore it *)
else write ()
end
| NONE =>
if doVirtual andalso Mach.hasProp props Name.meta_set
then
let
(* FIXME: no idea if this is correct behavior for meta::set *)
val metaSetFn = needObj (getValueOrVirtual base Name.meta_set false)
val nameObj = (* FIXME: need a builtin Name.es object here. *)
newString (#id name)
in
evalCallExpr base metaSetFn [nameObj, v];
()
end
else
let
val prop = { state = Mach.ValProp v,
ty = Ast.SpecialType Ast.Any,
attrs = { dontDelete = false,
dontEnum = false,
readOnly = false,
isFixed = false } }
in
Mach.addProp props name prop
end
end
and setValue (base:Mach.OBJ)
(name:Ast.NAME)
(v:Mach.VAL)
: unit =
setValueOrVirtual base name v true
(* A "defValue" call occurs when assigning a property definition's
* initial value, as specified by the user. All other assignments
* to a property go through "setValue". *)
and defValue (base:Mach.OBJ)
(name:Ast.NAME)
(v:Mach.VAL)
: unit =
case base of
Mach.Obj { props, ... } =>
if not (Mach.hasProp props name)
then error ["defValue on missing property: ", fmtName name]
else
(*
* defProp has relaxed rules: you can write to an
* uninitialized property or a read-only property.
*)
let
val existingProp = Mach.getProp props name
val newProp = { state = Mach.ValProp v,
ty = (#ty existingProp),
attrs = (#attrs existingProp) }
fun writeProp _ =
((* FIXME: insert typecheck here *)
Mach.delProp props name;
Mach.addProp props name newProp)
in
case (#state existingProp) of
Mach.TypeVarProp =>
error ["defValue on type variable property: ",
fmtName name]
| Mach.TypeProp =>
error ["defValue on type property: ",
fmtName name]
| Mach.NamespaceProp _ =>
error ["defValue on namespace property: ",
fmtName name]
| Mach.NativeFunctionProp _ =>
error ["defValue on native function property: ",
fmtName name]
| Mach.MethodProp _ =>
error ["defValue on method property: ",
fmtName name]
| Mach.ValListProp _ =>
error ["defValue on value-list property: ",
fmtName name]
| Mach.VirtualValProp { setter = SOME s, ... } =>
(invokeFuncClosure base s [v]; ())
| Mach.VirtualValProp { setter = NONE, ... } =>
error ["defValue on virtual property w/o setter: ",
fmtName name]
| Mach.UninitProp => writeProp ()
| Mach.ValProp _ => writeProp ()
end
and instantiateGlobalClass (n:Ast.NAME)
(args:Mach.VAL list)
: Mach.VAL =
let
val _ = trace ["instantiating global class ", fmtName n];
val (cls:Mach.VAL) = getValue (getGlobalObject ()) n
in
case cls of
Mach.Object ob => evalNewExpr ob args
| _ => error ["global class name ", fmtName n,
" did not resolve to object"]
end
and newObject _ =
instantiateGlobalClass Name.public_Object []
and newObj _ =
needObj (instantiateGlobalClass Name.public_Object [])
and newRootBuiltin (n:Ast.NAME) (m:Mach.MAGIC)
: Mach.VAL =
(*
* Five of our builtin types require special handling when it comes
* to constructing them: we wish to run the builtin ctors with no
* arguments at all, then clobber the magic slot in the resulting
* object. All other builtins we can pass a tagless "ur-Objects" into the
* builtin ctor and let it modify its own magic slot using magic::setValue.
*
* For these cases (Function, Class, Namespace, Boolean and boolean) we
* cannot rely on the builtin ctor calling magic::setValue, as they need
* to exist in order to *execute* a call to magic::setValue (or execute
* the tiny amount of surrounding control flow that is used to bottom our
* of the conversion functions in Conversion.es).
*)
let
val obj = needObj (instantiateGlobalClass n [])
val _ = trace ["finished building root builtin ", fmtName n]
in
Mach.Object (Mach.setMagic obj (SOME m))
end
and newArray (vals:Mach.VAL list)
: Mach.VAL =
let val a = instantiateGlobalClass Name.public_Array [newInt (Int32.fromInt (List.length vals))]
fun init a _ [] = ()
| init a k (x::xs) =
(setValue a (Name.public (Int.toString k)) x ;
init a (k+1) xs)
in
init (needObj a) 0 vals;
a
end
and newBuiltin (n:Ast.NAME) (m:Mach.MAGIC option)
: Mach.VAL =
instantiateGlobalClass n [Mach.Object (Mach.setMagic (Mach.newObjNoTag()) m)]
and newDouble (n:Real64.real)
: Mach.VAL =
newBuiltin Name.public_double (SOME (Mach.Double n))
and newDecimal (n:Decimal.DEC)
: Mach.VAL =
newBuiltin Name.public_decimal (SOME (Mach.Decimal n))
and newInt (n:Int32.int)
: Mach.VAL =
newBuiltin Name.public_int (SOME (Mach.Int n))
and newUInt (n:Word32.word)
: Mach.VAL =
newBuiltin Name.public_uint (SOME (Mach.UInt n))
and newString (s:Ast.USTRING)
: Mach.VAL =
newBuiltin Name.public_string (SOME (Mach.String s))
and newByteArray (b:Word8Array.array)
: Mach.VAL =
newBuiltin Name.public_ByteArray (SOME (Mach.ByteArray b))
and newBoolean (b:bool)
: Mach.VAL =
newBuiltin Name.public_boolean (SOME (Mach.Boolean b))
and newNamespace (n:Ast.NAMESPACE)
: Mach.VAL =
newRootBuiltin Name.public_Namespace (Mach.Namespace n)
and newClsClosure (env:Mach.SCOPE)
(cls:Ast.CLS)
: Mach.CLS_CLOSURE =
{ cls = cls,
(* FIXME: are all types bound? *)
allTypesBound = true,
env = env }
and newClass (e:Mach.SCOPE)
(cls:Ast.CLS)
: Mach.VAL =
let
val closure = newClsClosure e cls
in
newRootBuiltin Name.public_Class (Mach.Class closure)
end
and newFunClosure (e:Mach.SCOPE)
(f:Ast.FUNC)
(this:Mach.OBJ option)
: Mach.FUN_CLOSURE =
let
val Ast.Func { fsig, ... } = f
val allTypesBound = (case fsig of
Ast.FunctionSignature { typeParams, ... }
=> (length typeParams) = 0)
in
{ func = f,
this = this,
allTypesBound = allTypesBound,
env = e }
end
and newFunctionFromClosure (closure:Mach.FUN_CLOSURE) =
let
val { func, ... } = closure
val Ast.Func { fsig, ... } = func
val tag = Mach.FunctionTag fsig
val res = newRootBuiltin Name.public_Function (Mach.Function closure)
val _ = trace ["finding Function.prototype"]
val globalFuncObj = needObj (getValue (getGlobalObject()) Name.public_Function)
val globalFuncProto = getValue globalFuncObj Name.public_prototype
val _ = trace ["building new prototype chained to Function.prototype"]
val newProto = Mach.Object (Mach.setProto (newObj ()) globalFuncProto)
val _ = trace ["built new prototype chained to Function.prototype"]
in
(*
* FIXME: modify the returned object to have the proper tag, a subtype
* of Function.
*)
setValue (needObj res) Name.public_prototype newProto;
res
end
and newFunctionFromFunc (e:Mach.SCOPE)
(f:Ast.FUNC)
: Mach.VAL =
newFunctionFromClosure (newFunClosure e f NONE)
and newNativeFunction (f:Mach.NATIVE_FUNCTION) =
newRootBuiltin Name.public_Function (Mach.NativeFunction f)
(* An approximation of an invocation argument list, for debugging. *)
and callApprox (id:Ast.IDENT) (args:Mach.VAL list)
: string =
let
fun approx arg =
if Mach.isString arg
then "\"" ^ (toString arg) ^ "\""
else toString arg
in
id ^ "(" ^ (join ", " (map approx args)) ^ ")"
end
(* FIXME: this is not the correct toString *)
and magicToString (magic:Mach.MAGIC)
: string =
case magic of
Mach.Double n =>
if Real64.isFinite n andalso Real64.==(Real64.realFloor n, n)
then LargeInt.toString (Real64.toLargeInt IEEEReal.TO_NEGINF n)
else (if Real64.isNan n
then "NaN"
else (if Real64.==(Real64.posInf, n)
then "Infinity"
else (if Real64.==(Real64.negInf, n)
then "-Infinity"
else Real64.toString n)))
| Mach.Decimal d => Decimal.toString d
| Mach.Int i => Int32.toString i
| Mach.UInt u => LargeInt.toString (Word32.toLargeInt u)
| Mach.String s => s
| Mach.Boolean true => "true"
| Mach.Boolean false => "false"
| Mach.Namespace (Ast.Private _) => "[private namespace]"
| Mach.Namespace (Ast.Protected _) => "[protected namespace]"
| Mach.Namespace Ast.Intrinsic => "[intrinsic namespace]"
| Mach.Namespace Ast.OperatorNamespace => "[operator namespace]"
| Mach.Namespace (Ast.Public id) => "[public namespace: " ^ id ^ "]"
| Mach.Namespace (Ast.Internal _) => "[internal namespace]"
| Mach.Namespace (Ast.UserNamespace id) => "[user-defined namespace " ^ id ^ "]"
| Mach.Class _ => "[class Class]"
| Mach.Interface _ => "[interface Interface]"
| Mach.Function _ => "[function Function]"
| Mach.Type _ => "[type Function]"
| Mach.ByteArray _ => "[ByteArray]"
| Mach.NativeFunction _ => "[function NativeFunction]"
| _ => error ["Shouldn't happen: failed to match in Eval.magicToString."]
(*
* FIXME: want to transfer *some* of these up to Conversions.es, but it's
* very easy to get into feedback loops if you do so.
*)
and toString (v:Mach.VAL)
: string =
( trace ["toString"] ;
case v of
Mach.Undef => "undefined"
| Mach.Null => "null"
| Mach.Object (Mach.Obj ob) =>
case !(#magic ob) of
NONE => let val r = resolveOnObjAndPrototypes (Mach.Obj ob)
{ nss=[[Name.internalNS], [Name.publicNS]], id="toString" }
in
case r of
NONE => "[Object object 0]"
| SOME (base, name) =>
let val meth = getValue base name
in
case meth of
Mach.Object metho =>
let val res = Mach.Undef (* evalCallExpr (SOME (Mach.Obj ob)) metho [] *) (* Awaiting fix to "this" bug *)
in
case res of
Mach.Object (Mach.Obj ro) =>
(case !(#magic ro) of
SOME (Mach.String s) => s
| _ => "[Object object 1]")
| _ => "[Object object 2]"
end
| Mach.Null => "[Object object 3.1]"
| Mach.Undef => "[Object object 3.2]"
end
end
| SOME magic =>
magicToString magic)
and toBoolean (v:Mach.VAL) : bool =
case v of
Mach.Undef => false
| Mach.Null => false
| Mach.Object (Mach.Obj ob) =>
(case !(#magic ob) of
SOME (Mach.Boolean b) => b
| SOME (Mach.Int x) => not (x = (Int32.fromInt 0))
| SOME (Mach.UInt x) => not (x = (Word32.fromInt 0))
| SOME (Mach.Double x) => not (Real64.==(x,(Real64.fromInt 0))
orelse
Real64.isNan x)
| SOME (Mach.Decimal x) => not (x = Decimal.zero)
| _ => true)
(*
* Arithmetic operations.
*)
and toNumeric (v:Mach.VAL)
: Mach.VAL =
let
fun NaN _ = newDouble (Real64.posInf / Real64.posInf)
fun zero _ = newDouble (Real64.fromInt 0)
fun one _ = newDouble (Real64.fromInt 1)
in
case v of
Mach.Undef => NaN ()
| Mach.Null => zero ()
| Mach.Object (Mach.Obj ob) =>
(case !(#magic ob) of
SOME (Mach.Double _) => v
| SOME (Mach.Decimal _) => v
| SOME (Mach.Int _) => v
| SOME (Mach.UInt _) => v
| SOME (Mach.Boolean false) => zero ()
| SOME (Mach.Boolean true) => one ()
(*
* FIXME: This is not the correct definition of ToNumber applied to string.
* See ES3 9.3.1. We need to talk it over.
*)
| SOME (Mach.String s) => (case Real64.fromString s of
SOME s' => newDouble s'
| NONE => NaN ())
(*
* FIXME: ES3 9.3 defines ToNumber on objects in terms of primitives. We've
* reorganized the classification of primitives vs. objects. Revisit this.
*)
| _ => zero ())
end
and toDecimal (precision:int)
(mode:Decimal.ROUNDING_MODE)
(v:Mach.VAL)
: Decimal.DEC =
case v of
Mach.Undef => Decimal.NaN
| Mach.Null => Decimal.zero
| Mach.Object (Mach.Obj ob) =>
(case !(#magic ob) of
SOME (Mach.Double d) =>
(* NB: Lossy. *)
(case Decimal.fromString precision mode (Real64.toString d) of
SOME d' => d'
| NONE => Decimal.NaN)
| SOME (Mach.Decimal d) => d
| SOME (Mach.Int i) => Decimal.fromLargeInt (Int32.toLarge i)
| SOME (Mach.UInt u) => Decimal.fromLargeInt (Word32.toLargeInt u)
| SOME (Mach.Boolean false) => Decimal.zero
| SOME (Mach.Boolean true) => Decimal.one
(*
* FIXME: This is not the correct definition either. See toNumeric.
*)
| SOME (Mach.String s) => (case Decimal.fromString precision mode s of
SOME s' => s'
| NONE => Decimal.NaN)
(*
* FIXME: Possibly wrong here also. See comment in toNumeric.
*)
| _ => Decimal.zero)
and toDouble (v:Mach.VAL)
: Real64.real =
let
fun NaN _ = (Real64.posInf / Real64.posInf)
fun zero _ = (Real64.fromInt 0)
fun one _ = (Real64.fromInt 1)
in
case v of
Mach.Undef => NaN ()
| Mach.Null => zero ()
| Mach.Object (Mach.Obj ob) =>
(case !(#magic ob) of
SOME (Mach.Double d) => d
| SOME (Mach.Decimal d) =>
(* NB: Lossy. *)
(case Real64.fromString (Decimal.toString d) of
SOME d' => d'
| NONE => NaN ())
| SOME (Mach.Int i) => Real64.fromLargeInt (Int32.toLarge i)
| SOME (Mach.UInt u) => Real64.fromLargeInt (Word32.toLargeInt u)