MODULE M3CSundries;
*************************************************************************
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 Text;
IMPORT AST, M3AST_AS;
IMPORT M3AST_AS_F, M3AST_SM_F;
IMPORT ASTWalk;
IMPORT M3Error, M3CDuplicate, M3CNameClash;
PROCEDURE Call(call: M3AST_AS.Call; isStatement: BOOLEAN) RAISES {}=
VAR
noResult: BOOLEAN;
BEGIN
TYPECASE call.as_callexp.sm_exp_type_spec OF
| NULL =>
| M3AST_AS.Procedure_type(procType) =>
noResult := procType.as_result_type = NIL;
IF noResult # isStatement THEN
VAR
e: Text.T;
BEGIN
IF isStatement THEN
e := "call of function procedure cannot be used as a statement";
ELSE
e := "call of proper procedure cannot be used in an expression";
END; (* if *)
M3Error.Report(call, e);
END;
END; (* if *)
ELSE
END; (* typecase *)
END Call;
PROCEDURE Procedure(p: M3AST_AS.Proc_decl; isModule: BOOLEAN) RAISES {}=
VAR
hasBody := p.as_body # NIL;
BEGIN
IF hasBody # isModule THEN
VAR
e: Text.T;
BEGIN
IF hasBody THEN
e := "procedure in interface cannot have body";
ELSE
e := "procedure in module must have body";
END; (* if *)
M3Error.Report(p, e);
END;
END; (* if *)
END Procedure;
REVEAL
Handle = BRANDED OBJECT
inModule, isProperCall: BOOLEAN;
loopCount, procNesting: INTEGER := 0;
END;
PROCEDURE Check(h: Handle; any: AST.NODE; v: ASTWalk.VisitMode) RAISES {}=
BEGIN
IF v = ASTWalk.VisitMode.Entry THEN
TYPECASE any OF
| M3AST_AS.Loop_st, M3AST_AS.While_st,
M3AST_AS.For_st, M3AST_AS.Repeat_st =>
INC(h.loopCount);
| M3AST_AS.Call_st =>
h.isProperCall := TRUE;
| M3AST_AS.Call(call) =>
Call(call, h.isProperCall);
h.isProperCall := FALSE;
| M3AST_AS.Proc_decl(proc_decl) =>
INC(h.procNesting);
Procedure(proc_decl, h.inModule);
| M3AST_AS.Exit_st =>
IF h.loopCount = 0 THEN
M3Error.Report(any, "EXIT must be inside loop");
END;
| M3AST_AS.Case_st(case_st) =>
M3CDuplicate.CaseLabels(case_st);
| M3AST_AS.Try_except(try_except) =>
M3CDuplicate.HandlerExceptions(try_except);
| M3AST_AS.Enumeration_type(enumeration_type)=>
M3CNameClash.Enumeration(enumeration_type);
| M3AST_AS.Record_type(record_type) =>
M3CNameClash.Record(record_type);
| M3AST_AS.Object_type(object_type) =>
M3CNameClash.Object(object_type);
| M3AST_AS.Procedure_type(procedure_type) =>
M3CNameClash.Procedure(procedure_type);
| M3AST_AS.Exc_decl_s =>
IF h.procNesting # 0 THEN
M3Error.Report(any,
"exception must be declared at top level");
END;
| M3AST_AS.Concrete_reveal, M3AST_AS.Subtype_reveal =>
IF h.procNesting # 0 THEN
M3Error.Report(any,
"type can only be revealed at top level");
END;
ELSE
(* nothing *)
END; (* if *)
ELSE
TYPECASE any OF
| M3AST_AS.Loop_st, M3AST_AS.While_st,
M3AST_AS.For_st, M3AST_AS.Repeat_st =>
DEC(h.loopCount);
| M3AST_AS.Proc_decl =>
DEC(h.procNesting);
ELSE
(* nothing *)
END; (* case *)
END; (* case *)
END Check;
PROCEDURE NewHandle(
inModule, isProperCall, inLoop, inProc: BOOLEAN)
: Handle
RAISES {}=
VAR
new := NEW(Handle, inModule := inModule, isProperCall := isProperCall);
BEGIN
IF inLoop THEN INC(new.loopCount) END;
IF inProc THEN INC(new.procNesting) END;
RETURN new;
END NewHandle;
BEGIN
END M3CSundries.