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668 lines
24 KiB
ObjectPascal
668 lines
24 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Does declaration (but not type) parsing 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 pdecl;
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{$i fpcdefs.inc}
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interface
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uses
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{ global }
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globals,
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{ symtable }
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symsym,
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{ pass_1 }
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node;
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function readconstant(const orgname:string;const filepos:tfileposinfo):tconstsym;
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procedure const_dec;
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procedure label_dec;
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procedure type_dec;
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procedure var_dec;
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procedure threadvar_dec;
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procedure property_dec;
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procedure resourcestring_dec;
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implementation
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uses
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{ common }
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cutils,cclasses,
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{ global }
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globtype,tokens,verbose,
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systems,
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{ aasm }
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aasmbase,aasmtai,fmodule,
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{ symtable }
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symconst,symbase,symtype,symdef,symtable,paramgr,
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{ pass 1 }
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nmat,nadd,ncal,nset,ncnv,ninl,ncon,nld,nflw,nobj,
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{ codegen }
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ncgutil,
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{ parser }
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scanner,
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pbase,pexpr,ptype,ptconst,pdecsub,pdecvar,pdecobj,
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{ cpu-information }
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cpuinfo
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;
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function readconstant(const orgname:string;const filepos:tfileposinfo):tconstsym;
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var
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hp : tconstsym;
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p : tnode;
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ps : pconstset;
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pd : pbestreal;
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pg : pguid;
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sp : pchar;
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storetokenpos : tfileposinfo;
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begin
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readconstant:=nil;
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if orgname='' then
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internalerror(9584582);
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hp:=nil;
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p:=comp_expr(true);
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storetokenpos:=akttokenpos;
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akttokenpos:=filepos;
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case p.nodetype of
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ordconstn:
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begin
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if p.resulttype.def.deftype=pointerdef then
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hp:=tconstsym.create_ordptr(orgname,constpointer,tordconstnode(p).value,p.resulttype)
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else
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hp:=tconstsym.create_ord(orgname,constord,tordconstnode(p).value,p.resulttype);
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end;
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stringconstn:
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begin
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getmem(sp,tstringconstnode(p).len+1);
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move(tstringconstnode(p).value_str^,sp^,tstringconstnode(p).len+1);
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hp:=tconstsym.create_string(orgname,conststring,sp,tstringconstnode(p).len);
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end;
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realconstn :
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begin
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new(pd);
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pd^:=trealconstnode(p).value_real;
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hp:=tconstsym.create_ptr(orgname,constreal,pd,p.resulttype);
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end;
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setconstn :
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begin
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new(ps);
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ps^:=tsetconstnode(p).value_set^;
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hp:=tconstsym.create_ptr(orgname,constset,ps,p.resulttype);
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end;
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pointerconstn :
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begin
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hp:=tconstsym.create_ordptr(orgname,constpointer,tpointerconstnode(p).value,p.resulttype);
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end;
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niln :
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begin
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hp:=tconstsym.create_ord(orgname,constnil,0,p.resulttype);
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end;
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typen :
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begin
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if is_interface(p.resulttype.def) then
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begin
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if assigned(tobjectdef(p.resulttype.def).iidguid) then
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begin
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new(pg);
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pg^:=tobjectdef(p.resulttype.def).iidguid^;
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hp:=tconstsym.create_ptr(orgname,constguid,pg,p.resulttype);
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end
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else
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Message1(parser_e_interface_has_no_guid,tobjectdef(p.resulttype.def).objrealname^);
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end
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else
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Message(parser_e_illegal_expression);
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end;
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else
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Message(parser_e_illegal_expression);
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end;
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akttokenpos:=storetokenpos;
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p.free;
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readconstant:=hp;
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end;
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procedure const_dec;
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var
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orgname : stringid;
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tt : ttype;
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sym : tsym;
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dummysymoptions : tsymoptions;
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storetokenpos,filepos : tfileposinfo;
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old_block_type : tblock_type;
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skipequal : boolean;
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begin
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consume(_CONST);
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old_block_type:=block_type;
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block_type:=bt_const;
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repeat
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orgname:=orgpattern;
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filepos:=akttokenpos;
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consume(_ID);
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case token of
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_EQUAL:
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begin
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consume(_EQUAL);
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sym:=readconstant(orgname,filepos);
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{ Support hint directives }
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dummysymoptions:=[];
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try_consume_hintdirective(dummysymoptions);
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if assigned(sym) then
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begin
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sym.symoptions:=sym.symoptions+dummysymoptions;
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symtablestack.insert(sym);
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end;
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consume(_SEMICOLON);
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end;
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_COLON:
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begin
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{ set the blocktype first so a consume also supports a
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caret, to support const s : ^string = nil }
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block_type:=bt_type;
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consume(_COLON);
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ignore_equal:=true;
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read_type(tt,'',false);
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ignore_equal:=false;
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block_type:=bt_const;
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skipequal:=false;
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{ create symbol }
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storetokenpos:=akttokenpos;
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akttokenpos:=filepos;
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sym:=ttypedconstsym.createtype(orgname,tt,(cs_typed_const_writable in aktlocalswitches));
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akttokenpos:=storetokenpos;
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symtablestack.insert(sym);
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insertconstdata(ttypedconstsym(sym));
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{ procvar can have proc directives, but not type references }
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if (tt.def.deftype=procvardef) and
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(tt.sym=nil) then
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begin
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{ support p : procedure;stdcall=nil; }
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if try_to_consume(_SEMICOLON) then
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begin
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if check_proc_directive(true) then
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parse_var_proc_directives(sym)
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else
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begin
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Message(parser_e_proc_directive_expected);
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skipequal:=true;
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end;
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end
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else
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{ support p : procedure stdcall=nil; }
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begin
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if check_proc_directive(true) then
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parse_var_proc_directives(sym);
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end;
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{ add default calling convention }
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handle_calling_convention(tabstractprocdef(tt.def));
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end;
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if not skipequal then
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begin
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{ get init value }
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consume(_EQUAL);
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readtypedconst(tt,ttypedconstsym(sym),(cs_typed_const_writable in aktlocalswitches));
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try_consume_hintdirective(sym.symoptions);
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consume(_SEMICOLON);
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end;
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end;
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else
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{ generate an error }
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consume(_EQUAL);
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end;
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until token<>_ID;
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block_type:=old_block_type;
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end;
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procedure label_dec;
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var
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hl : tasmlabel;
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begin
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consume(_LABEL);
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if not(cs_support_goto in aktmoduleswitches) then
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Message(sym_e_goto_and_label_not_supported);
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repeat
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if not(token in [_ID,_INTCONST]) then
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consume(_ID)
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else
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begin
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objectlibrary.getlabel(hl);
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if token=_ID then
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symtablestack.insert(tlabelsym.create(orgpattern,hl))
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else
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symtablestack.insert(tlabelsym.create(pattern,hl));
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consume(token);
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end;
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if token<>_SEMICOLON then consume(_COMMA);
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until not(token in [_ID,_INTCONST]);
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consume(_SEMICOLON);
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end;
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{ search in symtablestack used, but not defined type }
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procedure resolve_type_forward(p : tnamedindexitem;arg:pointer);
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var
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hpd,pd : tdef;
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stpos : tfileposinfo;
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again : boolean;
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srsym : tsym;
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srsymtable : tsymtable;
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{$ifdef gdb_notused}
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stab_str:Pchar;
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{$endif gdb_notused}
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begin
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{ Check only typesyms or record/object fields }
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case tsym(p).typ of
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typesym :
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pd:=ttypesym(p).restype.def;
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fieldvarsym :
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pd:=tfieldvarsym(p).vartype.def
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else
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exit;
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end;
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repeat
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again:=false;
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case pd.deftype of
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arraydef :
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begin
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{ elementtype could also be defined using a forwarddef }
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pd:=tarraydef(pd).elementtype.def;
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again:=true;
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end;
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pointerdef,
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classrefdef :
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begin
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{ classrefdef inherits from pointerdef }
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hpd:=tpointerdef(pd).pointertype.def;
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{ still a forward def ? }
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if hpd.deftype=forwarddef then
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begin
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{ try to resolve the forward }
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{ get the correct position for it }
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stpos:=akttokenpos;
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akttokenpos:=tforwarddef(hpd).forwardpos;
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resolving_forward:=true;
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make_ref:=false;
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if not assigned(tforwarddef(hpd).tosymname) then
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internalerror(20021120);
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searchsym(tforwarddef(hpd).tosymname^,srsym,srsymtable);
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make_ref:=true;
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resolving_forward:=false;
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akttokenpos:=stpos;
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{ we don't need the forwarddef anymore, dispose it }
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hpd.free;
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tpointerdef(pd).pointertype.def:=nil; { if error occurs }
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{ was a type sym found ? }
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if assigned(srsym) and
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(srsym.typ=typesym) then
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begin
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tpointerdef(pd).pointertype.setsym(srsym);
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{ avoid wrong unused warnings web bug 801 PM }
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inc(ttypesym(srsym).refs);
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{$ifdef GDB_UNUSED}
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if (cs_debuginfo in aktmoduleswitches) and assigned(debuglist) and
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(tsym(p).owner.symtabletype in [globalsymtable,staticsymtable]) then
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begin
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ttypesym(p).isusedinstab:=true;
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{ ttypesym(p).concatstabto(debuglist);}
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{not stabs for forward defs }
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if not Ttypesym(p).isstabwritten then
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begin
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if Ttypesym(p).restype.def.typesym=p then
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Tstoreddef(Ttypesym(p).restype.def).concatstabto(debuglist)
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else
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begin
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stab_str:=Ttypesym(p).stabstring;
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if assigned(stab_str) then
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debuglist.concat(Tai_stabs.create(stab_str));
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Ttypesym(p).isstabwritten:=true;
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end;
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end;
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end;
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{$endif GDB_UNUSED}
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{ we need a class type for classrefdef }
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if (pd.deftype=classrefdef) and
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not(is_class(ttypesym(srsym).restype.def)) then
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Message1(type_e_class_type_expected,ttypesym(srsym).restype.def.typename);
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end
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else
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begin
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MessagePos1(tsym(p).fileinfo,sym_e_forward_type_not_resolved,tsym(p).realname);
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{ try to recover }
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tpointerdef(pd).pointertype:=generrortype;
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end;
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end;
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end;
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recorddef :
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trecorddef(pd).symtable.foreach_static(@resolve_type_forward,nil);
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objectdef :
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begin
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if not(m_fpc in aktmodeswitches) and
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(oo_is_forward in tobjectdef(pd).objectoptions) then
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begin
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{ only give an error as the implementation may follow in an
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other type block which is allowed by FPC modes }
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MessagePos1(tsym(p).fileinfo,sym_e_forward_type_not_resolved,tsym(p).realname);
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end
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else
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begin
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{ Check all fields of the object declaration, but don't
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check objectdefs in objects/records, because these
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can't exist (anonymous objects aren't allowed) }
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if not(tsym(p).owner.symtabletype in [objectsymtable,recordsymtable]) then
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tobjectdef(pd).symtable.foreach_static(@resolve_type_forward,nil);
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end;
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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 type declaration to the symbol table }
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procedure type_dec;
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var
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typename,orgtypename : stringid;
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newtype : ttypesym;
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sym : tsym;
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srsymtable : tsymtable;
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tt : ttype;
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oldfilepos,
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defpos,storetokenpos : tfileposinfo;
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old_block_type : tblock_type;
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ch : tclassheader;
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unique,istyperenaming : boolean;
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begin
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old_block_type:=block_type;
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block_type:=bt_type;
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consume(_TYPE);
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typecanbeforward:=true;
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repeat
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typename:=pattern;
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orgtypename:=orgpattern;
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defpos:=akttokenpos;
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istyperenaming:=false;
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consume(_ID);
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consume(_EQUAL);
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{ support 'ttype=type word' syntax }
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unique:=try_to_consume(_TYPE);
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{ is the type already defined? }
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searchsym(typename,sym,srsymtable);
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newtype:=nil;
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{ found a symbol with this name? }
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if assigned(sym) then
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begin
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if (sym.typ=typesym) then
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begin
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if ((token=_CLASS) or
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(token=_INTERFACE)) and
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(assigned(ttypesym(sym).restype.def)) and
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is_class_or_interface(ttypesym(sym).restype.def) and
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(oo_is_forward in tobjectdef(ttypesym(sym).restype.def).objectoptions) then
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begin
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{ we can ignore the result }
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{ the definition is modified }
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object_dec(orgtypename,tobjectdef(ttypesym(sym).restype.def));
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newtype:=ttypesym(sym);
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tt:=newtype.restype;
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end
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else
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message1(parser_h_type_redef,orgtypename);
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end;
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end;
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{ no old type reused ? Then insert this new type }
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if not assigned(newtype) then
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begin
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{ insert the new type first with an errordef, so that
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referencing the type before it's really set it
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will give an error (PFV) }
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tt:=generrortype;
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storetokenpos:=akttokenpos;
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newtype:=ttypesym.create(orgtypename,tt);
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symtablestack.insert(newtype);
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akttokenpos:=defpos;
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akttokenpos:=storetokenpos;
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{ read the type definition }
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read_type(tt,orgtypename,false);
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{ update the definition of the type }
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newtype.restype:=tt;
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if assigned(tt.sym) then
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istyperenaming:=true
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else
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tt.sym:=newtype;
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if unique and assigned(tt.def) then
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begin
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tt.setdef(tstoreddef(tt.def).getcopy);
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include(tt.def.defoptions,df_unique);
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newtype.restype:=tt;
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end;
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if assigned(tt.def) and not assigned(tt.def.typesym) then
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tt.def.typesym:=newtype;
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{ KAZ: handle TGUID declaration in system unit }
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if (cs_compilesystem in aktmoduleswitches) and not assigned(rec_tguid) and
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(typename='TGUID') and { name: TGUID and size=16 bytes that is 128 bits }
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assigned(tt.def) and (tt.def.deftype=recorddef) and (tt.def.size=16) then
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rec_tguid:=trecorddef(tt.def);
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end;
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if assigned(tt.def) then
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begin
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case tt.def.deftype of
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pointerdef :
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begin
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consume(_SEMICOLON);
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if try_to_consume(_FAR) then
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begin
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tpointerdef(tt.def).is_far:=true;
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consume(_SEMICOLON);
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end;
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end;
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procvardef :
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begin
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{ in case of type renaming, don't parse proc directives }
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if istyperenaming then
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consume(_SEMICOLON)
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else
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begin
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if not check_proc_directive(true) then
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consume(_SEMICOLON);
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parse_var_proc_directives(tsym(newtype));
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handle_calling_convention(tprocvardef(tt.def));
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end;
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end;
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objectdef,
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recorddef :
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begin
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try_consume_hintdirective(newtype.symoptions);
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consume(_SEMICOLON);
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end;
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else
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consume(_SEMICOLON);
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end;
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end;
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{ Write tables if we are the typesym that defines
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this type. This will not be done for simple type renamings }
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if (tt.def.typesym=newtype) then
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begin
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{ file position }
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oldfilepos:=aktfilepos;
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aktfilepos:=newtype.fileinfo;
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{ generate persistent init/final tables when it's declared in the interface so it can
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be reused in other used }
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if current_module.in_interface and
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((is_class(tt.def) and
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tobjectdef(tt.def).members_need_inittable) or
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tt.def.needs_inittable) then
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generate_inittable(newtype);
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{ for objects we should write the vmt and interfaces.
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This need to be done after the rtti has been written, because
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it can contain a reference to that data (PFV)
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|
This is not for forward classes }
|
|
if (tt.def.deftype=objectdef) then
|
|
with Tobjectdef(tt.def) do
|
|
begin
|
|
if not(oo_is_forward in objectoptions) then
|
|
begin
|
|
ch:=tclassheader.create(tobjectdef(tt.def));
|
|
{ generate and check virtual methods, must be done
|
|
before RTTI is written }
|
|
ch.genvmt;
|
|
{ Generate RTTI for class }
|
|
generate_rtti(newtype);
|
|
if is_interface(tobjectdef(tt.def)) then
|
|
ch.writeinterfaceids;
|
|
if (oo_has_vmt in objectoptions) then
|
|
ch.writevmt;
|
|
ch.free;
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
{ Always generate RTTI info for all types. This is to have typeinfo() return
|
|
the same pointer }
|
|
generate_rtti(newtype);
|
|
end;
|
|
|
|
aktfilepos:=oldfilepos;
|
|
end;
|
|
until token<>_ID;
|
|
typecanbeforward:=false;
|
|
symtablestack.foreach_static(@resolve_type_forward,nil);
|
|
block_type:=old_block_type;
|
|
end;
|
|
|
|
|
|
procedure var_dec;
|
|
{ parses variable declarations and inserts them in }
|
|
{ the top symbol table of symtablestack }
|
|
begin
|
|
consume(_VAR);
|
|
read_var_decs(false,false,false);
|
|
end;
|
|
|
|
|
|
procedure property_dec;
|
|
var
|
|
old_block_type : tblock_type;
|
|
begin
|
|
consume(_PROPERTY);
|
|
if not(symtablestack.symtabletype in [staticsymtable,globalsymtable]) then
|
|
message(parser_e_resourcestring_only_sg);
|
|
old_block_type:=block_type;
|
|
block_type:=bt_const;
|
|
repeat
|
|
read_property_dec(nil);
|
|
consume(_SEMICOLON);
|
|
until token<>_ID;
|
|
block_type:=old_block_type;
|
|
end;
|
|
|
|
|
|
procedure threadvar_dec;
|
|
{ parses thread variable declarations and inserts them in }
|
|
{ the top symbol table of symtablestack }
|
|
begin
|
|
consume(_THREADVAR);
|
|
if not(symtablestack.symtabletype in [staticsymtable,globalsymtable]) then
|
|
message(parser_e_threadvars_only_sg);
|
|
read_var_decs(false,false,true);
|
|
end;
|
|
|
|
|
|
procedure resourcestring_dec;
|
|
var
|
|
orgname : stringid;
|
|
p : tnode;
|
|
dummysymoptions : tsymoptions;
|
|
storetokenpos,filepos : tfileposinfo;
|
|
old_block_type : tblock_type;
|
|
sp : pchar;
|
|
sym : tsym;
|
|
begin
|
|
consume(_RESOURCESTRING);
|
|
if not(symtablestack.symtabletype in [staticsymtable,globalsymtable]) then
|
|
message(parser_e_resourcestring_only_sg);
|
|
old_block_type:=block_type;
|
|
block_type:=bt_const;
|
|
repeat
|
|
orgname:=orgpattern;
|
|
filepos:=akttokenpos;
|
|
consume(_ID);
|
|
case token of
|
|
_EQUAL:
|
|
begin
|
|
consume(_EQUAL);
|
|
p:=comp_expr(true);
|
|
storetokenpos:=akttokenpos;
|
|
akttokenpos:=filepos;
|
|
sym:=nil;
|
|
case p.nodetype of
|
|
ordconstn:
|
|
begin
|
|
if is_constcharnode(p) then
|
|
begin
|
|
getmem(sp,2);
|
|
sp[0]:=chr(tordconstnode(p).value);
|
|
sp[1]:=#0;
|
|
sym:=tconstsym.create_string(orgname,constresourcestring,sp,1);
|
|
end
|
|
else
|
|
Message(parser_e_illegal_expression);
|
|
end;
|
|
stringconstn:
|
|
with Tstringconstnode(p) do
|
|
begin
|
|
getmem(sp,len+1);
|
|
move(value_str^,sp^,len+1);
|
|
sym:=tconstsym.create_string(orgname,constresourcestring,sp,len);
|
|
end;
|
|
else
|
|
Message(parser_e_illegal_expression);
|
|
end;
|
|
akttokenpos:=storetokenpos;
|
|
{ Support hint directives }
|
|
dummysymoptions:=[];
|
|
try_consume_hintdirective(dummysymoptions);
|
|
if assigned(sym) then
|
|
begin
|
|
sym.symoptions:=sym.symoptions+dummysymoptions;
|
|
symtablestack.insert(sym);
|
|
end;
|
|
consume(_SEMICOLON);
|
|
p.free;
|
|
end;
|
|
else consume(_EQUAL);
|
|
end;
|
|
until token<>_ID;
|
|
block_type:=old_block_type;
|
|
end;
|
|
|
|
end.
|