Critical Mass Modula-3: m3tk/src/sem/M3CTypeRelation.i3

m3tk/src/sem/M3CTypeRelation.i3

INTERFACE M3CTypeRelation;

************************************************************************* 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 M3AST_AS, M3AST_SM;

<*INLINE*> PROCEDURE Identical(
    type1, type2: M3AST_SM.TYPE_SPEC_UNSET)
    : BOOLEAN
    RAISES {};

succeeds if the given types are identical. Is optimistic - succeeds if either type is unset


PROCEDURE SubType(type1, type2: M3AST_SM.TYPE_SPEC_UNSET): BOOLEAN RAISES {};

succeeds if 'type1 <: type2'. Is optimistic - succeeds if either type is unset


PROCEDURE Assignable(
    lhs, rhs: M3AST_SM.TYPE_SPEC_UNSET;
    safe: BOOLEAN)
    : BOOLEAN
    RAISES {};

succeeds if 'rhs' is assignable to 'lhs'. 'safe' determines whether it is ok to assign an ADDRESS to an untraced REF. Is optimistic - succeeds if either type is unset


PROCEDURE VARPassable(
    formalType, actualType: M3AST_SM.TYPE_SPEC_UNSET)
    : BOOLEAN
    RAISES {};

succeeds if 'actualType' can be passed to a VAR formal of 'formalType'. Is optimistic - succeeds if either type is unset


PROCEDURE Covered(p1, p2: M3AST_AS.Procedure_type): BOOLEAN RAISES {};

succeeds if the signature of 'p1' is covered by the signature of 'p2'


PROCEDURE Satisfies(
    procedure: M3AST_AS.Procedure_type;
    object: M3AST_AS.Object_type;
    method: M3AST_AS.Procedure_type)
    : BOOLEAN
    RAISES {};

succeeds if 'procedure' is a suitable type for the default of the given method in the given object type.


PROCEDURE SameReferenceClass(
    t1, t2: M3AST_SM.TYPE_SPEC_UNSET)
    : BOOLEAN
    RAISES {};

succeeds if both types are of the same reference class. This routine is optimistic; it only fails if: i) both 't1' and 't2' are reference types only one of which is traced ii) either 't1' or 't2' is a non reference type e.g. an ordinal or record. Any combination of unset and a reference type will succeed. Note that NULL, the type of NIL, is considered to be both a traced and an untraced reference type so any combination of NULL and another reference type will also succeed


<*INLINE*> PROCEDURE SameOrdinalSupertype(
    type1, type2: M3AST_SM.TYPE_SPEC_UNSET)
    : BOOLEAN
    RAISES {};

succeeds if both types are ordinal and have identical base types. Is a little optimistic - succeeds if one type is unset and the other is ordinal.


END M3CTypeRelation.