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302 lines
9.0 KiB
ObjectPascal
302 lines
9.0 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 by Florian Klaempfl
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Contains some helper routines for the parser
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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 pbase;
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interface
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uses
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cobjects,tokens,globals,symtable
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{$ifdef fixLeaksOnError}
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,comphook
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{$endif fixLeaksOnError}
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;
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const
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{ true, if we are after an assignement }
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afterassignment : boolean = false;
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{ sspecial for handling procedure vars }
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getprocvar : boolean = false;
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getprocvardef : pprocvardef = nil;
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var
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{ size of data segment, set by proc_unit or proc_program }
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datasize : longint;
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{ for operators }
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optoken : ttoken;
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opsym : pvarsym;
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{ symtable were unit references are stored }
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refsymtable : psymtable;
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{ true, if only routine headers should be parsed }
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parse_only : boolean;
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{ true, if we should ignore an equal in const x : 1..2=2 }
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ignore_equal : boolean;
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{$ifdef fixLeaksOnError}
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{ not worth it to make a pstack, there's only one data field (a pointer). }
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{ in the interface, because pmodules and psub also use it for their names }
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var strContStack: TStack;
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pbase_old_do_stop: tstopprocedure;
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{$endif fixLeaksOnError}
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function tokenstring(i : ttoken):string;
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{ consumes token i, if the current token is unequal i }
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{ a syntax error is written }
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procedure consume(i : ttoken);
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{Tries to consume the token i, and returns true if it was consumed:
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if token=i.}
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function try_to_consume(i:Ttoken):boolean;
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{ consumes all tokens til atoken (for error recovering }
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procedure consume_all_until(atoken : ttoken);
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{ consumes tokens while they are semicolons }
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procedure emptystats;
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{ reads a list of identifiers into a string container }
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function idlist : pstringcontainer;
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{ just for an accurate position of the end of a procedure (PM) }
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var
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last_endtoken_filepos: tfileposinfo;
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implementation
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uses
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files,scanner,systems,verbose;
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function tokenstring(i : ttoken):string;
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begin
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tokenstring:=tokeninfo^[i].str;
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end;
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{ consumes token i, write error if token is different }
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procedure consume(i : ttoken);
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begin
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if (token<>i) and (idtoken<>i) then
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if token=_id then
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Message2(scan_f_syn_expected,tokeninfo^[i].str,'identifier '+pattern)
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else
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Message2(scan_f_syn_expected,tokeninfo^[i].str,tokeninfo^[token].str)
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else
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begin
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if token=_END then
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last_endtoken_filepos:=tokenpos;
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current_scanner^.readtoken;
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end;
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end;
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function try_to_consume(i:Ttoken):boolean;
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begin
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try_to_consume:=false;
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if (token=i) or (idtoken=i) then
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begin
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try_to_consume:=true;
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if token=_END then
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last_endtoken_filepos:=tokenpos;
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current_scanner^.readtoken;
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end;
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end;
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procedure consume_all_until(atoken : ttoken);
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begin
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while (token<>atoken) and (idtoken<>atoken) do
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begin
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Consume(token);
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if token=_EOF then
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begin
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Consume(atoken);
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Message(scan_f_end_of_file);
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exit;
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end;
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end;
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end;
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procedure emptystats;
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begin
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repeat
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until not try_to_consume(_SEMICOLON);
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end;
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{ reads a list of identifiers into a string container }
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function idlist : pstringcontainer;
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var
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sc : pstringcontainer;
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begin
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sc:=new(pstringcontainer,init);
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repeat
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sc^.insert_with_tokeninfo(pattern,
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tokenpos);
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consume(_id);
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if token=_COMMA then consume(_COMMA)
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else break
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until false;
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idlist:=sc;
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end;
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{$ifdef fixLeaksOnError}
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procedure pbase_do_stop; {$ifdef tp} far; {$endif tp}
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var names: PStringContainer;
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begin
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names := PStringContainer(strContStack.pop);
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while names <> nil do
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begin
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dispose(names,done);
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names := PStringContainer(strContStack.pop);
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end;
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strContStack.done;
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do_stop := pbase_old_do_stop;
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{$ifdef tp}
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do_stop;
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{$else tp}
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do_stop();
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{$endif tp}
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end;
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begin
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strContStack.init;
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pbase_old_do_stop := do_stop;
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do_stop := {$ifndef tp}@{$endif}pbase_do_stop;
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{$endif fixLeaksOnError}
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end.
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{
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$Log$
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Revision 1.29 2000-01-11 17:16:04 jonas
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* removed a lot of memory leaks when an error is encountered (caused by
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procinfo and pstringcontainers). There are still plenty left though :)
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Revision 1.28 2000/01/07 01:14:28 peter
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* updated copyright to 2000
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Revision 1.27 1999/11/06 14:34:21 peter
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* truncated log to 20 revs
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Revision 1.26 1999/10/01 08:02:46 peter
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* forward type declaration rewritten
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Revision 1.25 1999/09/02 18:47:44 daniel
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* Could not compile with TP, some arrays moved to heap
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* NOAG386BIN default for TP
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* AG386* files were not compatible with TP, fixed.
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Revision 1.24 1999/08/04 13:02:50 jonas
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* all tokens now start with an underscore
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* PowerPC compiles!!
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Revision 1.23 1999/07/27 23:42:10 peter
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* indirect type referencing is now allowed
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Revision 1.22 1999/07/26 09:42:10 florian
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* bugs 494-496 fixed
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Revision 1.21 1999/04/28 06:02:05 florian
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* changes of Bruessel:
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+ message handler can now take an explicit self
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* typinfo fixed: sometimes the type names weren't written
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* the type checking for pointer comparisations and subtraction
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and are now more strict (was also buggy)
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* small bug fix to link.pas to support compiling on another
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drive
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* probable bug in popt386 fixed: call/jmp => push/jmp
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transformation didn't count correctly the jmp references
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+ threadvar support
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* warning if ln/sqrt gets an invalid constant argument
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Revision 1.20 1999/04/14 18:41:24 daniel
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* Better use of routines in pbase and symtable. 4k code removed.
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Revision 1.19 1999/04/08 20:59:42 florian
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* fixed problem with default properties which are a class
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* case bug (from the mailing list with -O2) fixed, the
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distance of the case labels can be greater than the positive
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range of a longint => it is now a dword for fpc
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Revision 1.18 1998/12/11 00:03:29 peter
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+ globtype,tokens,version unit splitted from globals
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Revision 1.17 1998/09/26 17:45:31 peter
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+ idtoken and only one token table
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Revision 1.16 1998/09/23 15:39:08 pierre
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* browser bugfixes
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was adding a reference when looking for the symbol
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if -bSYM_NAME was used
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Revision 1.15 1998/09/07 23:10:21 florian
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* a lot of stuff fixed regarding rtti and publishing of properties,
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basics should now work
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Revision 1.14 1998/07/14 21:46:49 peter
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* updated messages file
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Revision 1.13 1998/07/14 14:46:52 peter
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* released NEWINPUT
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Revision 1.12 1998/07/09 23:59:59 peter
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* fixed ttypesym bug finally
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* fileinfo in the symtable and better using for unused vars
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Revision 1.11 1998/07/07 11:20:02 peter
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+ NEWINPUT for a better inputfile and scanner object
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Revision 1.10 1998/06/05 14:37:31 pierre
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* fixes for inline for operators
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* inline procedure more correctly restricted
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Revision 1.9 1998/06/03 22:48:58 peter
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+ wordbool,longbool
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* rename bis,von -> high,low
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* moved some systemunit loading/creating to psystem.pas
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Revision 1.8 1998/05/23 01:21:18 peter
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+ aktasmmode, aktoptprocessor, aktoutputformat
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+ smartlink per module $SMARTLINK-/+ (like MMX) and moved to aktswitches
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+ $LIBNAME to set the library name where the unit will be put in
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* splitted cgi386 a bit (codeseg to large for bp7)
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* nasm, tasm works again. nasm moved to ag386nsm.pas
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Revision 1.7 1998/05/20 09:42:35 pierre
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+ UseTokenInfo now default
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* unit in interface uses and implementation uses gives error now
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* only one error for unknown symbol (uses lastsymknown boolean)
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the problem came from the label code !
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+ first inlined procedures and function work
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(warning there might be allowed cases were the result is still wrong !!)
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* UseBrower updated gives a global list of all position of all used symbols
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with switch -gb
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}
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