MODULE M3CBitSize;
*************************************************************************
Copyright (C) Olivetti 1989
All Rights reserved
Use and copy of this software and preparation of derivative works based
upon this software are permitted to any person, provided this same
copyright notice and the following Olivetti warranty disclaimer are
included in any copy of the software or any modification thereof or
derivative work therefrom made by any person.
This software is made available AS IS and Olivetti disclaims all
warranties with respect to this software, whether expressed or implied
under any law, including all implied warranties of merchantibility and
fitness for any purpose. In no event shall Olivetti be liable for any
damages whatsoever resulting from loss of use, data or profits or
otherwise arising out of or in connection with the use or performance
of this software.
*************************************************************************
IMPORT AST, M3AST_AS, M3AST_SM;
IMPORT M3AST_AS_F, M3AST_SM_F;
IMPORT M3ASTNext, M3CTypesMisc, M3COrdinal;
IMPORT M3CBackEnd;
Only the back-end knows how to compute these attributes.
What we do here is ensure that the attributes of dependent
types are computed before asking it to compute a size.
EXCEPTION UnsetComponent;
VAR
proto_object_type_g: M3AST_AS.Object_type := NIL;
PROCEDURE Set(an: AST.NODE) RAISES {}=
BEGIN
TYPECASE an OF
| M3AST_AS.TYPE_SPEC(ts) =>
TRY
Eval(ts);
EXCEPT
| UnsetComponent =>
(* leave unset *)
END;
ELSE
END; (* if *)
END Set;
PROCEDURE Eval(ts: M3AST_SM.TYPE_SPEC_UNSET) RAISES {UnsetComponent}=
VAR
componentType: M3AST_SM.TYPE_SPEC_UNSET;
BEGIN
IF ts = NIL THEN RAISE UnsetComponent END;
IF ts.sm_bitsize > 0 THEN RETURN END;
TYPECASE ts OF
| M3AST_AS.Record_type(recordType) =>
VAR
iter := M3ASTNext.NewIterField(recordType.as_fields_s);
fieldId: M3AST_AS.Field_id;
BEGIN
WHILE M3ASTNext.Field(iter, fieldId) DO
Eval(fieldId.sm_type_spec);
END; (* while *)
END;
| M3AST_AS.Object_type(objectType) =>
(* a reference type, but we compute the referent size/align also;
but we need to prepare for legal recursion, so we set the
size on the object first (using an empty prototype object). *)
VAR
iter := M3ASTNext.NewIterField(objectType.as_fields_s);
fieldId: M3AST_AS.Field_id;
BEGIN
IF proto_object_type_g = NIL THEN
proto_object_type_g := NEW(M3AST_AS.Object_type).init();
M3CBackEnd.BitSizeAndAlign(proto_object_type_g);
END;
objectType.sm_bitsize := proto_object_type_g.sm_bitsize;
objectType.sm_align := proto_object_type_g.sm_align;
WHILE M3ASTNext.Field(iter, fieldId) DO
Eval(fieldId.sm_type_spec);
END; (* while *)
END;
| M3AST_AS.Array_type(arrayType) =>
VAR
element, index: M3AST_SM.TYPE_SPEC_UNSET;
isopen: BOOLEAN;
BEGIN
IF M3ASTNext.Array(arrayType, element, isopen, index) THEN END;
IF NOT isopen THEN Eval(index) END;
Eval(element);
END;
| M3AST_AS.Packed_type(packedType) =>
CheckExp_value(packedType.as_exp);
CheckOrdinal(packedType.as_exp.sm_exp_type_spec, FALSE);
M3CTypesMisc.GetTYPE_SPECFromM3TYPE(
packedType.as_type, componentType);
Eval(componentType);
| M3AST_AS.Set_type(setType) =>
M3CTypesMisc.GetTYPE_SPECFromM3TYPE(
setType.as_type, componentType);
Eval(componentType);
| M3AST_AS.Subrange_type(subrangeType) =>
VAR
range := subrangeType.as_range;
BEGIN
CheckExp_value(range.as_exp1);
CheckOrdinal(range.as_exp1.sm_exp_type_spec, TRUE);
CheckExp_value(range.as_exp2);
CheckOrdinal(range.as_exp2.sm_exp_type_spec, TRUE);
END;
| M3AST_SM.Any_type, M3AST_SM.Type_type =>
RAISE UnsetComponent;
ELSE (* other primitive types *)
END; (* case *)
M3CBackEnd.BitSizeAndAlign(ts);
END Eval;
<*INLINE*> PROCEDURE CheckExp_value(e: M3AST_AS.EXP) RAISES {UnsetComponent}=
BEGIN
IF e.sm_exp_value = NIL THEN RAISE UnsetComponent END;
END CheckExp_value;
PROCEDURE CheckOrdinal(
ts: M3AST_SM.TYPE_SPEC_UNSET;
enumOk: BOOLEAN)
RAISES {UnsetComponent}=
VAR
baseType: M3AST_SM.TYPE_SPEC_UNSET;
BEGIN
IF M3COrdinal.Is(ts, baseType) THEN
TYPECASE baseType OF
| NULL =>
| M3AST_AS.Integer_type =>
RETURN;
| M3AST_AS.Enumeration_type =>
IF enumOk THEN RETURN END;
ELSE
END;
END;
RAISE UnsetComponent;
END CheckOrdinal;
BEGIN
END M3CBitSize.