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.