MODULE M3CNameClash;
*************************************************************************
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, M3AST_AS;
IMPORT M3AST_AS_F, M3AST_SM_F, M3AST_TM_F;
IMPORT M3ASTNext;
IMPORT SeqM3AST_AS_Enum_id, SeqM3AST_AS_Fields, SeqM3AST_AS_Method,
SeqM3AST_AS_Override;
IMPORT M3CId, M3Error, M3Assert, M3CScope_priv, M3Context;
TYPE
Definitions = M3CScope_priv.Definitions;
PROCEDURE IsStandard(d: M3AST_AS.DEF_ID): BOOLEAN RAISES {}=
VAR
unit: M3AST_AS.UNIT;
BEGIN
unit := d.tmp_unit_id.sm_spec;
RETURN unit.sm_comp_unit = M3Context.Standard();
END IsStandard;
**************************************************************
PROCEDURE AssertIsStandard(old, new: M3AST_AS.DEF_ID) RAISES {}=
VAR
BEGIN
IF NOT IsStandard(old) THEN M3Assert.Fail() END;
IF NOT IsStandard(new) THEN
M3Error.ReportWithId(new,
illegal redefinition of standard identifier \'%s\', new.lx_symrep);
END;
END AssertIsStandard;
******************************************
PROCEDURE Enter(
node: M3AST.NODE;
defId: M3AST_AS.DEF_ID;
VAR list: Definitions)
: BOOLEAN
RAISES {}=
VAR
id := defId.lx_symrep;
old, new: Definitions;
BEGIN
IF id = NIL THEN RETURN TRUE END;
old := id.defs;
IF old # NIL THEN
IF old.hook = node THEN
(* must be due to previous call of 'Enter', while processing
the current type *)
RETURN FALSE;
ELSE
VAR
d := old;
BEGIN
WHILE d.enclosing # NIL DO d := d.enclosing END;
IF IsStandard(d.defId) AND NOT IsStandard(defId) THEN
M3Error.ReportWithId(defId,
"illegal redefinition of standard identifier \'%s\'",
defId.lx_symrep);
RETURN TRUE;
END;
END;
END; (* if *)
END; (* if *)
new := NEW(Definitions, next := list, enclosing := old, id := id,
defId := defId,
scope := 0, hook := node);
list := new;
id.defs := new;
RETURN TRUE;
END Enter;
PROCEDURE DisposeList(list: Definitions) RAISES {}=
BEGIN
WHILE list # NIL DO
IF list # list.id.defs THEN M3Assert.Fail() END;
list.id.defs := list.enclosing;
list := list.next;
END; (* while *)
END DisposeList;
PROCEDURE Enumeration(e: M3AST_AS.Enumeration_type) RAISES {}=
VAR
list: Definitions;
iter: SeqM3AST_AS_Enum_id.Iter;
enumId: M3AST_AS.Enum_id;
BEGIN
list := NIL;
iter := SeqM3AST_AS_Enum_id.NewIter(e.as_id_s);
WHILE SeqM3AST_AS_Enum_id.Next(iter, enumId) DO
IF NOT Enter(e, enumId, list) THEN
M3Error.ReportWithId(enumId,
"name \'%s\' appears more than once in enumeration",
enumId.lx_symrep);
END; (* if *)
END; (* while *)
DisposeList(list);
END Enumeration;
PROCEDURE Fields(
node: M3AST.NODE;
f: SeqM3AST_AS_Fields.T)
: Definitions
RAISES {}=
VAR
list: Definitions;
iter: M3ASTNext.IterField;
fieldId: M3AST_AS.Field_id;
BEGIN
list := NIL;
iter := M3ASTNext.NewIterField(f);
WHILE M3ASTNext.Field(iter, fieldId) DO
IF NOT Enter(node, fieldId, list) THEN
M3Error.ReportWithId(fieldId,
"field name \'%s\' clashes with existing field name",
fieldId.lx_symrep);
END; (* if *)
END; (* while *)
RETURN list;
END Fields;
PROCEDURE Record(r: M3AST_AS.Record_type) RAISES {}=
VAR
list: Definitions;
BEGIN
list := Fields(r, r.as_fields_s);
DisposeList(list);
END Record;
PROCEDURE Object(o: M3AST_AS.Object_type) RAISES {}=
VAR
list: Definitions;
iter: SeqM3AST_AS_Method.Iter;
defId: M3AST_AS.DEF_ID;
method: M3AST_AS.Method;
BEGIN
list := Fields(o, o.as_fields_s);
iter := SeqM3AST_AS_Method.NewIter(o.as_method_s);
WHILE SeqM3AST_AS_Method.Next(iter, method) DO
defId := method.as_id;
IF NOT Enter(o, defId, list) THEN
M3Error.ReportWithId(defId,
"method name \'%s\' clashes with existing field or method name",
defId.lx_symrep);
END; (* if *)
END; (* while *)
VAR
iter := SeqM3AST_AS_Override.NewIter(o.as_override_s);
override: M3AST_AS.Override;
BEGIN
WHILE SeqM3AST_AS_Override.Next(iter, override) DO
defId := override.as_id;
IF NOT Enter(o, defId, list) THEN
M3Error.ReportWithId(defId,
"override method name \'%s\' clashes with existing field or method name",
defId.lx_symrep);
END; (* if *)
END; (* while *)
END;
DisposeList(list);
END Object;
PROCEDURE Procedure(p: M3AST_AS.Procedure_type) RAISES {}=
VAR
list: Definitions;
iter: M3ASTNext.IterFormal;
formal: M3AST_AS.Formal_param;
formalId: M3AST_AS.FORMAL_ID;
BEGIN
TYPECASE p.sm_def_id OF
| NULL =>
(* Procedure type - needs checking *)
| M3AST_AS.Proc_id =>
(* part of a 'Proc_decl'; already checked by 'M3CScope' code *)
RETURN;
ELSE
(* Method procedure type - needs checking *)
END;
list := NIL;
iter := M3ASTNext.NewIterFormal(p.as_formal_param_s);
WHILE M3ASTNext.Formal(iter, formal, formalId) DO
IF NOT Enter(p, formalId, list) THEN
M3Error.ReportWithId(formalId,
"parameter name \'%s\' clashes with existing parameter name",
formalId.lx_symrep);
END; (* if *)
END; (* while *)
DisposeList(list);
END Procedure;
BEGIN
END M3CNameClash.