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{
Copyright (c) 1998-2002 by Florian Klaempfl, Pierre Muller
This unit handles the symbol tables
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit symbase;
{$i fpcdefs.inc}
interface
uses
{ common }
cutils,cclasses,
{ global }
globtype,globals,
{ symtable }
symconst
;
{************************************************
Some internal constants
************************************************}
const
hasharraysize = 256;
indexgrowsize = 64;
{************************************************
Needed forward pointers
************************************************}
type
tsymtable = class;
{************************************************
TSymtableEntry
************************************************}
tsymtableentry = class(TNamedIndexItem)
owner : tsymtable;
end;
{************************************************
TDefEntry
************************************************}
tdefentry = class(tsymtableentry)
deftype : tdeftype;
end;
{************************************************
TSymEntry
************************************************}
{ this object is the base for all symbol objects }
tsymentry = class(tsymtableentry)
typ : tsymtyp;
end;
{************************************************
TSymtable
************************************************}
tsearchhasharray = array[0..hasharraysize-1] of tsymentry;
psearchhasharray = ^tsearchhasharray;
tsymtable = class
{$ifdef EXTDEBUG}
private
procedure dumpsym(p : TNamedIndexItem;arg:pointer);
{$endif EXTDEBUG}
public
name : pstring;
realname : pstring;
symindex,
defindex : TIndexArray;
symsearch : Tdictionary;
next : tsymtable;
defowner : tdefentry; { for records and objects }
symtabletype : tsymtabletype;
{ level of symtable, used for nested procedures }
symtablelevel : byte;
moduleid : longint;
refcount : integer;
constructor Create(const s:string);
destructor destroy;override;
procedure freeinstance;override;
function getcopy:tsymtable;
procedure clear;virtual;
function rename(const olds,news : stringid):tsymentry;
procedure foreach(proc2call : tnamedindexcallback;arg:pointer);
procedure foreach_static(proc2call : tnamedindexstaticcallback;arg:pointer);
procedure insert(sym : tsymentry);virtual;
{ deletes a tsymentry and removes it from the tsymtable}
procedure delete(sym:tsymentry);
procedure replace(oldsym,newsym:tsymentry);
function search(const s : stringid) : tsymentry;
function speedsearch(const s : stringid;speedvalue : cardinal) : tsymentry;virtual;
procedure registerdef(p : tdefentry);
function iscurrentunit:boolean;virtual;
{$ifdef EXTDEBUG}
procedure dump;
{$endif EXTDEBUG}
function getdefnr(l : longint) : tdefentry;
function getsymnr(l : longint) : tsymentry;
end;
var
registerdef : boolean; { true, when defs should be registered }
defaultsymtablestack : tsymtable; { symtablestack after default units have been loaded }
symtablestack : tsymtable; { linked list of symtables }
defaultmacrosymtablestack : tsymtable;{ macrosymtablestack after default units have been loaded }
macrosymtablestack: tsymtable; { linked list of macro symtables }
aktrecordsymtable : tsymtable; { current record symtable }
aktparasymtable : tsymtable; { current proc para symtable }
aktlocalsymtable : tsymtable; { current proc local symtable }
initialmacrosymtable: tsymtable; { macros initially defined by the compiler or
given on the command line. Is common
for all files compiled and do not change. }
implementation
uses
verbose;
{****************************************************************************
TSYMTABLE
****************************************************************************}
constructor tsymtable.Create(const s:string);
begin
if s<>'' then
begin
name:=stringdup(upper(s));
realname:=stringdup(s);
end
else
begin
name:=nil;
realname:=nil;
end;
symtabletype:=abstractsymtable;
symtablelevel:=0;
defowner:=nil;
next:=nil;
symindex:=tindexarray.create(indexgrowsize);
defindex:=TIndexArray.create(indexgrowsize);
symsearch:=tdictionary.create;
symsearch.noclear:=true;
refcount:=1;
end;
destructor tsymtable.destroy;
begin
{ freeinstance decreases refcount }
if refcount>1 then
exit;
stringdispose(name);
stringdispose(realname);
symindex.destroy;
defindex.destroy;
{ symsearch can already be disposed or set to nil for withsymtable }
if assigned(symsearch) then
begin
symsearch.destroy;
symsearch:=nil;
end;
end;
procedure tsymtable.freeinstance;
begin
dec(refcount);
if refcount=0 then
inherited freeinstance;
end;
function tsymtable.getcopy:tsymtable;
begin
inc(refcount);
result:=self;
end;
{$ifdef EXTDEBUG}
procedure tsymtable.dumpsym(p : TNamedIndexItem;arg:pointer);
begin
writeln(p.name);
end;
procedure tsymtable.dump;
begin
if assigned(name) then
writeln('Symtable ',name^)
else
writeln('Symtable <not named>');
symsearch.foreach(@dumpsym,nil);
end;
{$endif EXTDEBUG}
procedure tsymtable.registerdef(p : tdefentry);
begin
defindex.insert(p);
{ set def owner and indexnb }
p.owner:=self;
end;
function tsymtable.iscurrentunit:boolean;
begin
result:=false;
end;
procedure tsymtable.foreach(proc2call : tnamedindexcallback;arg:pointer);
begin
symindex.foreach(proc2call,arg);
end;
procedure tsymtable.foreach_static(proc2call : tnamedindexstaticcallback;arg:pointer);
begin
symindex.foreach_static(proc2call,arg);
end;
{***********************************************
Table Access
***********************************************}
procedure tsymtable.clear;
begin
symindex.clear;
defindex.clear;
end;
procedure tsymtable.insert(sym:tsymentry);
begin
sym.owner:=self;
{ insert in index and search hash }
symindex.insert(sym);
symsearch.insert(sym);
end;
procedure tsymtable.delete(sym:tsymentry);
begin
sym.owner:=nil;
{ remove from index and search hash }
symsearch.delete(sym.name);
symindex.delete(sym);
end;
procedure tsymtable.replace(oldsym,newsym:tsymentry);
begin
{ Replace the entry in the dictionary, this checks
the name }
if not symsearch.replace(oldsym,newsym) then
internalerror(200209061);
{ replace in index }
symindex.replace(oldsym,newsym);
{ set owner of new symb }
newsym.owner:=self;
end;
function tsymtable.search(const s : stringid) : tsymentry;
begin
search:=speedsearch(s,getspeedvalue(s));
end;
function tsymtable.speedsearch(const s : stringid;speedvalue : cardinal) : tsymentry;
begin
speedsearch:=tsymentry(symsearch.speedsearch(s,speedvalue));
end;
function tsymtable.rename(const olds,news : stringid):tsymentry;
begin
rename:=tsymentry(symsearch.rename(olds,news));
end;
function tsymtable.getsymnr(l : longint) : tsymentry;
var
hp : tsymentry;
begin
hp:=tsymentry(symindex.search(l));
if hp=nil then
internalerror(10999);
getsymnr:=hp;
end;
function tsymtable.getdefnr(l : longint) : tdefentry;
var
hp : tdefentry;
begin
hp:=tdefentry(defindex.search(l));
if hp=nil then
internalerror(10998);
getdefnr:=hp;
end;
end.
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