INTERFACE M3CChkUses;
*************************************************************************
Copyright (C) Olivetti 1989
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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
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of this software.
*************************************************************************
IMPORT AST, M3AST_AS, ASTWalk;
TYPE
Handle <: ASTWalk.Closure;
PROCEDURE NewHandle(cu: M3AST_AS.Compilation_Unit;
ignoreFORvars := FALSE): Handle RAISES {};
Create a new handle with 'Node' as the callback procedure.
If 'ignoreFORvars := FALSE', FOR loop control variables will not
be considered unused, even if they are! Since a 'Handle' is
a subtype of 'ASTWalk.Closure' it can be passed directly to
the tree walker. Alternatively, 'Node' can be called explicitly
from some other tree walk.
PROCEDURE Node(h: Handle; n: AST.NODE; vm: ASTWalk.VisitMode) RAISES {};
This procedure is to be called from the tree walker (in entry and exit mode)
so that it is called on every node in an AST. It checks for unused declarations
and imports. It observes the UNUSED pragma. An interface containing a REVEAL
statement is considered to be used irrespective of whether the revelation is
necessary.
PROCEDURE CloseHandle(h: Handle) RAISES {};
generate error messages for unused variables associated with the
analysis using 'h'.
END M3CChkUses.