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https://gitlab.com/freepascal.org/fpc/source.git
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746 lines
26 KiB
ObjectPascal
746 lines
26 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Does parsing types for Free Pascal
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit ptype;
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{$i fpcdefs.inc}
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interface
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uses
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globtype,cclasses,symtype,symdef;
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const
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{ forward types should only be possible inside a TYPE statement }
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typecanbeforward : boolean = false;
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var
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{ hack, which allows to use the current parsed }
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{ object type as function argument type }
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testcurobject : byte;
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{ reads a string, file type or a type id and returns a name and }
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{ tdef }
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procedure single_type(var tt:ttype;isforwarddef:boolean);
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procedure read_named_type(var tt:ttype;const name : stringid;genericdef:tstoreddef;genericlist:TFPObjectList;parseprocvardir:boolean);
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procedure read_anon_type(var tt : ttype;parseprocvardir:boolean);
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{ reads a type definition }
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{ to a appropriating tdef, s gets the name of }
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{ the type to allow name mangling }
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procedure id_type(var tt : ttype;isforwarddef:boolean);
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implementation
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uses
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{ common }
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cutils,
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{ global }
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globals,tokens,verbose,
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systems,
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{ target }
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paramgr,
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{ symtable }
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symconst,symbase,symsym,symtable,
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defutil,defcmp,
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{ pass 1 }
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node,
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nmat,nadd,ncal,nset,ncnv,ninl,ncon,nld,nflw,
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{ parser }
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scanner,
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pbase,pexpr,pdecsub,pdecvar,pdecobj;
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procedure generate_specialization(var pt1:tnode;const name:string);
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var
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st : tsymtable;
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pt2 : tnode;
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first,
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err : boolean;
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sym : tsym;
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genericdef : tstoreddef;
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generictype : ttypesym;
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generictypelist : TFPObjectList;
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begin
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{ retrieve generic def that we are going to replace }
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genericdef:=tstoreddef(pt1.resulttype.def);
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pt1.resulttype.reset;
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if not(df_generic in genericdef.defoptions) then
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begin
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Comment(V_Error,'Specialization is only supported for generic types');
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pt1.resulttype:=generrortype;
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{ recover }
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consume(_LSHARPBRACKET);
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repeat
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pt2:=factor(false);
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pt2.free;
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until not try_to_consume(_COMMA);
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consume(_RSHARPBRACKET);
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exit;
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end;
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consume(_LSHARPBRACKET);
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block_type:=bt_specialize;
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{ Parse generic parameters, for each undefineddef in the symtable of
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the genericdef we need to have a new def }
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err:=false;
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first:=true;
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generictypelist:=TFPObjectList.create(false);
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case genericdef.deftype of
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procdef :
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st:=genericdef.getsymtable(gs_para);
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objectdef,
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recorddef :
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st:=genericdef.getsymtable(gs_record);
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end;
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if not assigned(st) then
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internalerror(200511182);
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sym:=tsym(st.symindex.first);
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while assigned(sym) do
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begin
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if (sym.typ=typesym) and
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(ttypesym(sym).restype.def.deftype=undefineddef) then
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begin
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if not first then
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begin
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consume(_COMMA);
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first:=false;
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end;
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pt2:=factor(false);
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if pt2.nodetype=typen then
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begin
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generictype:=ttypesym.create(sym.realname,pt2.resulttype);
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generictypelist.add(generictype);
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end
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else
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begin
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Message(type_e_type_id_expected);
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err:=true;
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end;
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pt2.free;
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end;
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sym:=tsym(sym.indexnext);
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end;
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{ Reparse the original type definition }
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if not err then
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begin
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if not assigned(genericdef.generictokenbuf) then
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internalerror(200511171);
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current_scanner.startreplaytokens(genericdef.generictokenbuf);
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read_named_type(pt1.resulttype,name,genericdef,generictypelist,false);
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{ Consume the semicolon if it is also recorded }
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try_to_consume(_SEMICOLON);
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end;
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generictypelist.free;
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consume(_RSHARPBRACKET);
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end;
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procedure id_type(var tt : ttype;isforwarddef:boolean);
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{ reads a type definition }
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{ to a appropriating tdef, s gets the name of }
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{ the type to allow name mangling }
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var
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is_unit_specific : boolean;
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pos : tfileposinfo;
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srsym : tsym;
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srsymtable : tsymtable;
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s,sorg : stringid;
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begin
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s:=pattern;
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sorg:=orgpattern;
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pos:=akttokenpos;
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{ use of current parsed object:
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- classes can be used also in classes
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- objects can be parameters }
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if assigned(aktobjectdef) and
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(aktobjectdef.objname^=pattern) and
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(
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(testcurobject=2) or
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is_class_or_interface(aktobjectdef)
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)then
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begin
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consume(_ID);
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tt.setdef(aktobjectdef);
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exit;
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end;
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{ Use the special searchsym_type that ignores records,objects and
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parameters }
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searchsym_type(s,srsym,srsymtable);
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{ handle unit specification like System.Writeln }
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is_unit_specific:=try_consume_unitsym(srsym,srsymtable);
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consume(_ID);
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{ Types are first defined with an error def before assigning
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the real type so check if it's an errordef. if so then
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give an error. Only check for typesyms in the current symbol
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table as forwarddef are not resolved directly }
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if assigned(srsym) and
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(srsym.typ=typesym) and
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(ttypesym(srsym).restype.def.deftype=errordef) then
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begin
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Message1(type_e_type_is_not_completly_defined,ttypesym(srsym).realname);
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tt:=generrortype;
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exit;
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end;
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{ are we parsing a possible forward def ? }
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if isforwarddef and
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not(is_unit_specific) then
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begin
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tt.setdef(tforwarddef.create(s,pos));
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exit;
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end;
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{ unknown sym ? }
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if not assigned(srsym) then
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begin
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Message1(sym_e_id_not_found,sorg);
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tt:=generrortype;
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exit;
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end;
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{ type sym ? }
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if (srsym.typ<>typesym) then
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begin
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Message(type_e_type_id_expected);
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tt:=generrortype;
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exit;
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end;
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{ Give an error when referring to an errordef }
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if (ttypesym(srsym).restype.def.deftype=errordef) then
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begin
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Message(sym_e_error_in_type_def);
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tt:=generrortype;
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exit;
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end;
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{ Use the definitions for current unit, because
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they can be refered from the parameters and symbols are not
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loaded at that time. Only write the definition when the
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symbol is the real owner of the definition (not a redefine) }
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if (ttypesym(srsym).owner.symtabletype in [staticsymtable,globalsymtable]) and
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ttypesym(srsym).owner.iscurrentunit and
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(
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(ttypesym(srsym).restype.def.typesym=nil) or
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(srsym=ttypesym(srsym).restype.def.typesym)
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) then
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tt.setdef(ttypesym(srsym).restype.def)
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else
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tt.setsym(srsym);
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end;
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procedure single_type(var tt:ttype;isforwarddef:boolean);
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var
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t2 : ttype;
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again : boolean;
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begin
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repeat
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again:=false;
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case token of
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_STRING:
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string_dec(tt);
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_FILE:
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begin
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consume(_FILE);
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if try_to_consume(_OF) then
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begin
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single_type(t2,false);
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tt.setdef(tfiledef.createtyped(t2));
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end
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else
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tt:=cfiletype;
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end;
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_ID:
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begin
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if try_to_consume(_SPECIALIZE) then
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begin
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block_type:=bt_specialize;
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again:=true;
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end
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else
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id_type(tt,isforwarddef);
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end;
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else
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begin
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message(type_e_type_id_expected);
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tt:=generrortype;
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end;
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end;
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until not again;
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end;
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{ reads a record declaration }
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function record_dec : tdef;
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var
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recst : trecordsymtable;
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storetypecanbeforward : boolean;
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old_object_option : tsymoptions;
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begin
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{ create recdef }
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recst:=trecordsymtable.create(aktpackrecords);
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record_dec:=trecorddef.create(recst);
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{ insert in symtablestack }
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symtablestack.push(recst);
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{ parse record }
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consume(_RECORD);
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old_object_option:=current_object_option;
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current_object_option:=[sp_public];
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storetypecanbeforward:=typecanbeforward;
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{ for tp7 don't allow forward types }
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if m_tp7 in aktmodeswitches then
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typecanbeforward:=false;
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read_record_fields([vd_record]);
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consume(_END);
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typecanbeforward:=storetypecanbeforward;
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current_object_option:=old_object_option;
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{ make the record size aligned }
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recst.addalignmentpadding;
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{ restore symtable stack }
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symtablestack.pop(recst);
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end;
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{ reads a type definition and returns a pointer to it }
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procedure read_named_type(var tt : ttype;const name : stringid;genericdef:tstoreddef;genericlist:TFPObjectList;parseprocvardir:boolean);
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var
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pt : tnode;
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tt2 : ttype;
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aktenumdef : tenumdef;
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ap : tarraydef;
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s : stringid;
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l,v : TConstExprInt;
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oldaktpackrecords : longint;
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defpos,storepos : tfileposinfo;
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procedure expr_type;
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var
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pt1,pt2 : tnode;
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lv,hv : TConstExprInt;
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ispecialization : boolean;
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old_block_type : tblock_type;
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begin
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old_block_type:=block_type;
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{ use of current parsed object:
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- classes can be used also in classes
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- objects can be parameters }
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if (token=_ID) and
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assigned(aktobjectdef) and
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(aktobjectdef.objname^=pattern) and
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(
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(testcurobject=2) or
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is_class_or_interface(aktobjectdef)
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)then
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begin
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consume(_ID);
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tt.setdef(aktobjectdef);
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exit;
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end;
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{ Generate a specialization? }
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if try_to_consume(_SPECIALIZE) then
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block_type:=bt_specialize;
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{ we can't accept a equal in type }
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pt1:=comp_expr(not(ignore_equal));
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if (block_type<>bt_specialize) and
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try_to_consume(_POINTPOINT) then
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begin
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{ get high value of range }
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pt2:=comp_expr(not(ignore_equal));
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{ make both the same type or give an error. This is not
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done when both are integer values, because typecasting
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between -3200..3200 will result in a signed-unsigned
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conflict and give a range check error (PFV) }
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if not(is_integer(pt1.resulttype.def) and is_integer(pt2.resulttype.def)) then
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inserttypeconv(pt1,pt2.resulttype);
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{ both must be evaluated to constants now }
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if (pt1.nodetype=ordconstn) and
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(pt2.nodetype=ordconstn) then
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begin
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lv:=tordconstnode(pt1).value;
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hv:=tordconstnode(pt2).value;
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{ Check bounds }
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if hv<lv then
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Message(parser_e_upper_lower_than_lower)
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else
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begin
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{ All checks passed, create the new def }
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case pt1.resulttype.def.deftype of
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enumdef :
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tt.setdef(tenumdef.create_subrange(tenumdef(pt1.resulttype.def),lv,hv));
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orddef :
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begin
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if is_char(pt1.resulttype.def) then
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tt.setdef(torddef.create(uchar,lv,hv))
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else
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if is_boolean(pt1.resulttype.def) then
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tt.setdef(torddef.create(bool8bit,lv,hv))
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else
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tt.setdef(torddef.create(range_to_basetype(lv,hv),lv,hv));
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end;
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end;
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end;
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end
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else
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Message(sym_e_error_in_type_def);
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pt2.free;
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end
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else
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begin
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{ a simple type renaming or generic specialization }
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if (pt1.nodetype=typen) then
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begin
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if (block_type=bt_specialize) then
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generate_specialization(pt1,name);
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tt:=ttypenode(pt1).resulttype;
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end
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else
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Message(sym_e_error_in_type_def);
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end;
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pt1.free;
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block_type:=old_block_type;
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end;
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procedure array_dec;
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var
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lowval,
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highval : aint;
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arraytype : ttype;
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ht : ttype;
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procedure setdefdecl(const t:ttype);
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begin
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case t.def.deftype of
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enumdef :
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begin
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lowval:=tenumdef(t.def).min;
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highval:=tenumdef(t.def).max;
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if (m_fpc in aktmodeswitches) and
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(tenumdef(t.def).has_jumps) then
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Message(type_e_array_index_enums_with_assign_not_possible);
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arraytype:=t;
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end;
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orddef :
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begin
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if torddef(t.def).typ in [uchar,
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u8bit,u16bit,
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s8bit,s16bit,s32bit,
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{$ifdef cpu64bit}
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u32bit,s64bit,
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{$endif cpu64bit}
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bool8bit,bool16bit,bool32bit,
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uwidechar] then
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begin
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lowval:=torddef(t.def).low;
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highval:=torddef(t.def).high;
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arraytype:=t;
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end
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else
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Message1(parser_e_type_cant_be_used_in_array_index,t.def.gettypename);
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end;
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else
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Message(sym_e_error_in_type_def);
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end;
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end;
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begin
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consume(_ARRAY);
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{ open array? }
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if token=_LECKKLAMMER then
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begin
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consume(_LECKKLAMMER);
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{ defaults }
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arraytype:=generrortype;
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lowval:=low(aint);
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highval:=high(aint);
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tt.reset;
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repeat
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{ read the expression and check it, check apart if the
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declaration is an enum declaration because that needs to
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be parsed by readtype (PFV) }
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if token=_LKLAMMER then
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begin
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read_anon_type(ht,true);
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setdefdecl(ht);
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end
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else
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begin
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pt:=expr;
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if pt.nodetype=typen then
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setdefdecl(pt.resulttype)
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else
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begin
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if (pt.nodetype=rangen) then
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begin
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if (trangenode(pt).left.nodetype=ordconstn) and
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(trangenode(pt).right.nodetype=ordconstn) then
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begin
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{ make both the same type or give an error. This is not
|
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done when both are integer values, because typecasting
|
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between -3200..3200 will result in a signed-unsigned
|
|
conflict and give a range check error (PFV) }
|
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if not(is_integer(trangenode(pt).left.resulttype.def) and is_integer(trangenode(pt).left.resulttype.def)) then
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inserttypeconv(trangenode(pt).left,trangenode(pt).right.resulttype);
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lowval:=tordconstnode(trangenode(pt).left).value;
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highval:=tordconstnode(trangenode(pt).right).value;
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if highval<lowval then
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begin
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Message(parser_e_array_lower_less_than_upper_bound);
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highval:=lowval;
|
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end;
|
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if is_integer(trangenode(pt).left.resulttype.def) then
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range_to_type(lowval,highval,arraytype)
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else
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arraytype:=trangenode(pt).left.resulttype;
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end
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else
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Message(type_e_cant_eval_constant_expr);
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end
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else
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Message(sym_e_error_in_type_def)
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end;
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pt.free;
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end;
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|
|
{ create arraydef }
|
|
if not assigned(tt.def) then
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begin
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ap:=tarraydef.create(lowval,highval,arraytype);
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tt.setdef(ap);
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end
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else
|
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begin
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ap.elementtype.setdef(tarraydef.create(lowval,highval,arraytype));
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ap:=tarraydef(ap.elementtype.def);
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end;
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|
|
if token=_COMMA then
|
|
consume(_COMMA)
|
|
else
|
|
break;
|
|
until false;
|
|
consume(_RECKKLAMMER);
|
|
end
|
|
else
|
|
begin
|
|
ap:=tarraydef.create(0,-1,s32inttype);
|
|
include(ap.arrayoptions,ado_IsDynamicArray);
|
|
tt.setdef(ap);
|
|
end;
|
|
consume(_OF);
|
|
read_anon_type(tt2,true);
|
|
{ if no error, set element type }
|
|
if assigned(ap) then
|
|
ap.setelementtype(tt2);
|
|
end;
|
|
|
|
var
|
|
p : tnode;
|
|
pd : tabstractprocdef;
|
|
is_func,
|
|
enumdupmsg : boolean;
|
|
newtype : ttypesym;
|
|
oldlocalswitches : tlocalswitches;
|
|
begin
|
|
tt.reset;
|
|
case token of
|
|
_STRING,_FILE:
|
|
begin
|
|
single_type(tt,false);
|
|
end;
|
|
_LKLAMMER:
|
|
begin
|
|
consume(_LKLAMMER);
|
|
{ allow negativ value_str }
|
|
l:=-1;
|
|
enumdupmsg:=false;
|
|
aktenumdef:=tenumdef.create;
|
|
repeat
|
|
s:=orgpattern;
|
|
defpos:=akttokenpos;
|
|
consume(_ID);
|
|
{ only allow assigning of specific numbers under fpc mode }
|
|
if not(m_tp7 in aktmodeswitches) and
|
|
(
|
|
{ in fpc mode also allow := to be compatible
|
|
with previous 1.0.x versions }
|
|
((m_fpc in aktmodeswitches) and
|
|
try_to_consume(_ASSIGNMENT)) or
|
|
try_to_consume(_EQUAL)
|
|
) then
|
|
begin
|
|
oldlocalswitches:=aktlocalswitches;
|
|
include(aktlocalswitches,cs_allow_enum_calc);
|
|
p:=comp_expr(true);
|
|
aktlocalswitches:=oldlocalswitches;
|
|
if (p.nodetype=ordconstn) then
|
|
begin
|
|
{ we expect an integer or an enum of the
|
|
same type }
|
|
if is_integer(p.resulttype.def) or
|
|
is_char(p.resulttype.def) or
|
|
equal_defs(p.resulttype.def,aktenumdef) then
|
|
v:=tordconstnode(p).value
|
|
else
|
|
IncompatibleTypes(p.resulttype.def,s32inttype.def);
|
|
end
|
|
else
|
|
Message(parser_e_illegal_expression);
|
|
p.free;
|
|
{ please leave that a note, allows type save }
|
|
{ declarations in the win32 units ! }
|
|
if (v<=l) and (not enumdupmsg) then
|
|
begin
|
|
Message(parser_n_duplicate_enum);
|
|
enumdupmsg:=true;
|
|
end;
|
|
l:=v;
|
|
end
|
|
else
|
|
inc(l);
|
|
storepos:=akttokenpos;
|
|
akttokenpos:=defpos;
|
|
tstoredsymtable(aktenumdef.owner).insert(tenumsym.create(s,aktenumdef,l));
|
|
akttokenpos:=storepos;
|
|
until not try_to_consume(_COMMA);
|
|
tt.setdef(aktenumdef);
|
|
consume(_RKLAMMER);
|
|
end;
|
|
_ARRAY:
|
|
begin
|
|
array_dec;
|
|
end;
|
|
_SET:
|
|
begin
|
|
consume(_SET);
|
|
consume(_OF);
|
|
read_anon_type(tt2,true);
|
|
if assigned(tt2.def) then
|
|
begin
|
|
case tt2.def.deftype of
|
|
{ don't forget that min can be negativ PM }
|
|
enumdef :
|
|
if tenumdef(tt2.def).min>=0 then
|
|
// !! tt.setdef(tsetdef.create(tt2,tenumdef(tt2.def).min,tenumdef(tt2.def).max))
|
|
tt.setdef(tsetdef.create(tt2,tenumdef(tt2.def).max))
|
|
else
|
|
Message(sym_e_ill_type_decl_set);
|
|
orddef :
|
|
begin
|
|
if (torddef(tt2.def).typ<>uvoid) and
|
|
(torddef(tt2.def).low>=0) then
|
|
// !! tt.setdef(tsetdef.create(tt2,torddef(tt2.def).low,torddef(tt2.def).high))
|
|
tt.setdef(tsetdef.create(tt2,torddef(tt2.def).high))
|
|
else
|
|
Message(sym_e_ill_type_decl_set);
|
|
end;
|
|
else
|
|
Message(sym_e_ill_type_decl_set);
|
|
end;
|
|
end
|
|
else
|
|
tt:=generrortype;
|
|
end;
|
|
_CARET:
|
|
begin
|
|
consume(_CARET);
|
|
single_type(tt2,typecanbeforward);
|
|
tt.setdef(tpointerdef.create(tt2));
|
|
end;
|
|
_RECORD:
|
|
begin
|
|
tt.setdef(record_dec);
|
|
end;
|
|
_PACKED:
|
|
begin
|
|
consume(_PACKED);
|
|
if token=_ARRAY then
|
|
array_dec
|
|
else
|
|
begin
|
|
oldaktpackrecords:=aktpackrecords;
|
|
aktpackrecords:=1;
|
|
if token in [_CLASS,_OBJECT] then
|
|
tt.setdef(object_dec(name,genericdef,genericlist,nil))
|
|
else
|
|
tt.setdef(record_dec);
|
|
aktpackrecords:=oldaktpackrecords;
|
|
end;
|
|
end;
|
|
_DISPINTERFACE,
|
|
_CLASS,
|
|
_CPPCLASS,
|
|
_INTERFACE,
|
|
_OBJECT:
|
|
begin
|
|
tt.setdef(object_dec(name,genericdef,genericlist,nil));
|
|
end;
|
|
_PROCEDURE,
|
|
_FUNCTION:
|
|
begin
|
|
is_func:=(token=_FUNCTION);
|
|
consume(token);
|
|
pd:=tprocvardef.create(normal_function_level);
|
|
if token=_LKLAMMER then
|
|
parse_parameter_dec(pd);
|
|
if is_func then
|
|
begin
|
|
consume(_COLON);
|
|
single_type(pd.rettype,false);
|
|
end;
|
|
if token=_OF then
|
|
begin
|
|
consume(_OF);
|
|
consume(_OBJECT);
|
|
include(pd.procoptions,po_methodpointer);
|
|
end;
|
|
tt.def:=pd;
|
|
{ possible proc directives }
|
|
if parseprocvardir then
|
|
begin
|
|
if check_proc_directive(true) then
|
|
begin
|
|
newtype:=ttypesym.create('unnamed',tt);
|
|
parse_var_proc_directives(tsym(newtype));
|
|
newtype.restype.def:=nil;
|
|
tt.def.typesym:=nil;
|
|
newtype.free;
|
|
end;
|
|
{ Add implicit hidden parameters and function result }
|
|
handle_calling_convention(pd);
|
|
end;
|
|
end;
|
|
else
|
|
expr_type;
|
|
end;
|
|
if tt.def=nil then
|
|
tt:=generrortype;
|
|
end;
|
|
|
|
|
|
procedure read_anon_type(var tt : ttype;parseprocvardir:boolean);
|
|
begin
|
|
read_named_type(tt,'',nil,nil,parseprocvardir);
|
|
end;
|
|
|
|
|
|
end.
|