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361 lines
9.6 KiB
ObjectPascal
361 lines
9.6 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2002 by Florian Klaempfl, Pierre Muller
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This unit handles the symbol tables
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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 symbase;
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{$i fpcdefs.inc}
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interface
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uses
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{ common }
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cutils,cclasses,
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{ global }
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globtype,globals,
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{ symtable }
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symconst
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;
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{************************************************
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Some internal constants
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************************************************}
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const
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hasharraysize = 256;
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indexgrowsize = 64;
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{$ifdef GDB}
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memsizeinc = 4096; { for long stabstrings }
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{$endif GDB}
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{************************************************
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Needed forward pointers
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************************************************}
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type
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tsymtable = class;
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{************************************************
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TSymtableEntry
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************************************************}
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tsymtableentry = class(TNamedIndexItem)
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owner : tsymtable;
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end;
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{************************************************
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TDefEntry
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************************************************}
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tdefentry = class(tsymtableentry)
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deftype : tdeftype;
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end;
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{************************************************
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TSymEntry
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************************************************}
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{ this object is the base for all symbol objects }
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tsymentry = class(tsymtableentry)
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typ : tsymtyp;
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end;
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{************************************************
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TSymtable
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************************************************}
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tsearchhasharray = array[0..hasharraysize-1] of tsymentry;
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psearchhasharray = ^tsearchhasharray;
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tsymtable = class
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{$ifdef EXTDEBUG}
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private
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procedure dumpsym(p : TNamedIndexItem;arg:pointer);
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{$endif EXTDEBUG}
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public
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name : pstring;
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realname : pstring;
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symindex,
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defindex : TIndexArray;
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symsearch : Tdictionary;
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next : tsymtable;
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defowner : tdefentry; { for records and objects }
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symtabletype : tsymtabletype;
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{ each symtable gets a number }
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unitid : word;
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{ level of symtable, used for nested procedures }
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symtablelevel : byte;
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refcount : integer;
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constructor Create(const s:string);
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destructor destroy;override;
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procedure freeinstance;override;
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function getcopy:tsymtable;
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procedure clear;virtual;
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function rename(const olds,news : stringid):tsymentry;
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procedure foreach(proc2call : tnamedindexcallback;arg:pointer);
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procedure foreach_static(proc2call : tnamedindexstaticcallback;arg:pointer);
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procedure insert(sym : tsymentry);virtual;
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procedure replace(oldsym,newsym:tsymentry);
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function search(const s : stringid) : tsymentry;
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function speedsearch(const s : stringid;speedvalue : cardinal) : tsymentry;virtual;
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procedure registerdef(p : tdefentry);
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{$ifdef EXTDEBUG}
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procedure dump;
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{$endif EXTDEBUG}
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function getdefnr(l : longint) : tdefentry;
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function getsymnr(l : longint) : tsymentry;
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{$ifdef GDB}
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function getnewtypecount : word; virtual;
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{$endif GDB}
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end;
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var
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registerdef : boolean; { true, when defs should be registered }
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defaultsymtablestack : tsymtable; { symtablestack after default units have been loaded }
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symtablestack : tsymtable; { linked list of symtables }
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aktrecordsymtable : tsymtable; { current record symtable }
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aktparasymtable : tsymtable; { current proc para symtable }
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aktlocalsymtable : tsymtable; { current proc local symtable }
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implementation
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uses
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verbose;
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{****************************************************************************
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TSYMTABLE
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****************************************************************************}
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constructor tsymtable.Create(const s:string);
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begin
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if s<>'' then
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begin
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name:=stringdup(upper(s));
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realname:=stringdup(s);
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end
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else
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begin
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name:=nil;
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realname:=nil;
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end;
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symtabletype:=abstractsymtable;
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symtablelevel:=0;
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defowner:=nil;
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next:=nil;
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symindex:=tindexarray.create(indexgrowsize);
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defindex:=TIndexArray.create(indexgrowsize);
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symsearch:=tdictionary.create;
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symsearch.noclear:=true;
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unitid:=0;
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refcount:=1;
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end;
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destructor tsymtable.destroy;
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begin
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{ freeinstance decreases refcount }
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if refcount>1 then
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exit;
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stringdispose(name);
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stringdispose(realname);
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symindex.destroy;
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defindex.destroy;
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{ symsearch can already be disposed or set to nil for withsymtable }
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if assigned(symsearch) then
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begin
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symsearch.destroy;
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symsearch:=nil;
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end;
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end;
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procedure tsymtable.freeinstance;
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begin
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dec(refcount);
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if refcount=0 then
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inherited freeinstance;
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end;
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function tsymtable.getcopy:tsymtable;
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begin
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inc(refcount);
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result:=self;
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end;
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{$ifdef EXTDEBUG}
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procedure tsymtable.dumpsym(p : TNamedIndexItem;arg:pointer);
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begin
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writeln(p.name);
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end;
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procedure tsymtable.dump;
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begin
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if assigned(name) then
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writeln('Symtable ',name^)
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else
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writeln('Symtable <not named>');
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symsearch.foreach({$ifdef FPCPROCVAR}@{$endif}dumpsym,nil);
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end;
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{$endif EXTDEBUG}
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procedure tsymtable.registerdef(p : tdefentry);
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begin
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defindex.insert(p);
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{ set def owner and indexnb }
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p.owner:=self;
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end;
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procedure tsymtable.foreach(proc2call : tnamedindexcallback;arg:pointer);
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begin
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symindex.foreach(proc2call,arg);
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end;
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procedure tsymtable.foreach_static(proc2call : tnamedindexstaticcallback;arg:pointer);
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begin
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symindex.foreach_static(proc2call,arg);
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end;
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{***********************************************
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Table Access
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***********************************************}
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procedure tsymtable.clear;
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begin
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symindex.clear;
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defindex.clear;
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end;
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procedure tsymtable.insert(sym:tsymentry);
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begin
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sym.owner:=self;
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{ insert in index and search hash }
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symindex.insert(sym);
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symsearch.insert(sym);
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end;
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procedure tsymtable.replace(oldsym,newsym:tsymentry);
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begin
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{ Replace the entry in the dictionary, this checks
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the name }
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if not symsearch.replace(oldsym,newsym) then
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internalerror(200209061);
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{ replace in index }
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symindex.replace(oldsym,newsym);
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{ set owner of new symb }
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newsym.owner:=self;
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end;
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function tsymtable.search(const s : stringid) : tsymentry;
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begin
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search:=speedsearch(s,getspeedvalue(s));
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end;
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function tsymtable.speedsearch(const s : stringid;speedvalue : cardinal) : tsymentry;
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begin
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speedsearch:=tsymentry(symsearch.speedsearch(s,speedvalue));
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end;
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function tsymtable.rename(const olds,news : stringid):tsymentry;
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begin
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rename:=tsymentry(symsearch.rename(olds,news));
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end;
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function tsymtable.getsymnr(l : longint) : tsymentry;
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var
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hp : tsymentry;
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begin
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hp:=tsymentry(symindex.search(l));
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if hp=nil then
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internalerror(10999);
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getsymnr:=hp;
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end;
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function tsymtable.getdefnr(l : longint) : tdefentry;
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var
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hp : tdefentry;
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begin
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hp:=tdefentry(defindex.search(l));
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if hp=nil then
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internalerror(10998);
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getdefnr:=hp;
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end;
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{$ifdef GDB}
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function tsymtable.getnewtypecount : word;
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begin
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getnewtypecount:=0;
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end;
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{$endif GDB}
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end.
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{
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$Log$
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Revision 1.22 2004-07-09 22:17:32 peter
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* revert has_localst patch
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* replace aktstaticsymtable/aktglobalsymtable with current_module
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Revision 1.21 2004/06/20 08:55:30 florian
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* logs truncated
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Revision 1.20 2004/03/02 17:32:12 florian
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* make cycle fixed
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+ pic support for darwin
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+ support of importing vars from shared libs on darwin implemented
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Revision 1.19 2004/02/04 22:15:15 daniel
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* Rtti generation moved to ncgutil
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* Assmtai usage of symsym removed
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* operator overloading cleanup up
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Revision 1.18 2004/01/15 15:16:18 daniel
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* Some minor stuff
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* Managed to eliminate speed effects of string compression
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Revision 1.17 2004/01/11 23:56:20 daniel
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* Experiment: Compress strings to save memory
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Did not save a single byte of mem; clearly the core size is boosted by
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temporary memory usage...
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}
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