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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 symtype;
{$i fpcdefs.inc}
interface
uses
{ common }
cutils,
cclasses,
{ global }
globtype,globals,constexp,
{ symtable }
symconst,symbase,
{ aasm }
aasmbase,ppu,cpuinfo
;
type
{************************************************
Required Forwards
************************************************}
tsym = class;
Tcompilerppufile=class;
{************************************************
TDef
************************************************}
tgeTSymtable = (gs_none,gs_record,gs_local,gs_para);
tdef = class(TDefEntry)
typesym : tsym; { which type the definition was generated this def }
{ maybe it's useful to merge the dwarf and stabs debugging info with some hacking }
{ dwarf debugging }
dwarf_lab : tasmsymbol;
dwarf_ref_lab : tasmsymbol;
{ stabs debugging }
stab_number : word;
dbg_state : tdefdbgstatus;
defoptions : tdefoptions;
defstates : tdefstates;
constructor create(dt:tdeftyp);
procedure buildderef;virtual;abstract;
procedure buildderefimpl;virtual;abstract;
procedure deref;virtual;abstract;
procedure derefimpl;virtual;abstract;
function typename:string;
function GetTypeName:string;virtual;
function typesymbolprettyname:string;virtual;
function mangledparaname:string;
function getmangledparaname:string;virtual;
function rtti_mangledname(rt:trttitype):string;virtual;abstract;
function OwnerHierarchyName: string; virtual; abstract;
function size:asizeint;virtual;abstract;
function packedbitsize:asizeint;virtual;
function alignment:shortint;virtual;abstract;
function getvardef:longint;virtual;abstract;
function getparentdef:tdef;virtual;
function geTSymtable(t:tgeTSymtable):TSymtable;virtual;
function is_publishable:boolean;virtual;abstract;
function needs_inittable:boolean;virtual;abstract;
function is_related(def:tdef):boolean;virtual;
procedure ChangeOwner(st:TSymtable);
procedure register_created_object_type;virtual;
end;
{************************************************
TSym
************************************************}
{ this object is the base for all symbol objects }
{ tsym }
tsym = class(TSymEntry)
protected
public
fileinfo : tfileposinfo;
symoptions : tsymoptions;
refs : longint;
reflist : TLinkedList;
visibility : tvisibility;
{ deprecated optionally can have a message }
deprecatedmsg: pshortstring;
isdbgwritten : boolean;
constructor create(st:tsymtyp;const aname:string);
destructor destroy;override;
function mangledname:string; virtual;
function prettyname:string; virtual;
procedure buildderef;virtual;
procedure deref;virtual;
procedure ChangeOwner(st:TSymtable);
procedure IncRefCount;
procedure IncRefCountBy(AValue : longint);
procedure MaybeCreateRefList;
procedure AddRef;
end;
tsymarr = array[0..maxlongint div sizeof(pointer)-1] of tsym;
psymarr = ^tsymarr;
{************************************************
TDeref
************************************************}
tderef = object
dataidx : longint;
procedure reset;
procedure build(s:TObject);
function resolve:TObject;
end;
{************************************************
tpropaccesslist
************************************************}
ppropaccesslistitem = ^tpropaccesslistitem;
tpropaccesslistitem = record
sltype : tsltype;
next : ppropaccesslistitem;
case byte of
0 : (sym : tsym; symderef : tderef);
1 : (value : TConstExprInt; valuedef: tdef; valuedefderef:tderef);
2 : (def: tdef; defderef:tderef);
end;
tpropaccesslist = class
procdef : tdef;
procdefderef : tderef;
firstsym,
lastsym : ppropaccesslistitem;
constructor create;
destructor destroy;override;
function empty:boolean;
procedure addsym(slt:tsltype;p:tsym);
procedure addconst(slt:tsltype;v:TConstExprInt;d:tdef);
procedure addtype(slt:tsltype;d:tdef);
procedure addsymderef(slt:tsltype;d:tderef);
procedure addconstderef(slt:tsltype;v:TConstExprInt;d:tderef);
procedure addtypederef(slt:tsltype;d:tderef);
procedure clear;
procedure resolve;
procedure buildderef;
end;
{************************************************
Tcompilerppufile
************************************************}
tcompilerppufile=class(tppufile)
public
procedure checkerror;
procedure getguid(var g: tguid);
function getexprint:Tconstexprint;
function getptruint:TConstPtrUInt;
procedure getposinfo(var p:tfileposinfo);
procedure getderef(var d:tderef);
function getpropaccesslist:tpropaccesslist;
function getasmsymbol:tasmsymbol;
procedure putguid(const g: tguid);
procedure putexprint(const v:tconstexprint);
procedure PutPtrUInt(v:TConstPtrUInt);
procedure putposinfo(const p:tfileposinfo);
procedure putderef(const d:tderef);
procedure putpropaccesslist(p:tpropaccesslist);
procedure putasmsymbol(s:tasmsymbol);
end;
{$ifdef MEMDEBUG}
var
memmanglednames,
memprocpara,
memprocparast,
memproclocalst,
memprocnodetree : tmemdebug;
{$endif MEMDEBUG}
function FindUnitSymtable(st:TSymtable):TSymtable;
implementation
uses
crefs,
verbose,
fmodule
;
{****************************************************************************
Utils
****************************************************************************}
function FindUnitSymtable(st:TSymtable):TSymtable;
begin
result:=nil;
repeat
if not assigned(st) then
internalerror(200602034);
case st.symtabletype of
localmacrosymtable,
exportedmacrosymtable,
staticsymtable,
globalsymtable :
begin
result:=st;
exit;
end;
recordsymtable,
enumsymtable,
arraysymtable,
localsymtable,
parasymtable,
ObjectSymtable :
st:=st.defowner.owner;
else
internalerror(200602035);
end;
until false;
end;
{****************************************************************************
Tdef
****************************************************************************}
constructor tdef.create(dt:tdeftyp);
begin
inherited create;
typ:=dt;
owner := nil;
typesym := nil;
defoptions:=[];
dbg_state:=dbg_state_unused;
stab_number:=0;
end;
function tdef.typename:string;
begin
result:=OwnerHierarchyName;
if assigned(typesym) and
not(typ in [procvardef,procdef]) and
(typesym.realname[1]<>'$') then
result:=result+typesym.realname
else
result:=result+GetTypeName;
end;
function tdef.GetTypeName : string;
begin
GetTypeName:='<unknown type>'
end;
function tdef.typesymbolprettyname:string;
begin
result:=OwnerHierarchyName;
if assigned(typesym) then
result:=result+typesym.prettyname
else
result:=result+'<no type symbol>'
end;
function tdef.mangledparaname:string;
begin
if assigned(typesym) then
mangledparaname:=typesym.name
else
mangledparaname:=getmangledparaname;
end;
function tdef.getmangledparaname:string;
begin
result:='<unknown type>';
end;
function tdef.getparentdef:tdef;
begin
result:=nil;
end;
function tdef.geTSymtable(t:tgeTSymtable):TSymtable;
begin
result:=nil;
end;
function tdef.is_related(def:tdef):boolean;
begin
result:=false;
end;
function tdef.packedbitsize:asizeint;
begin
result:=size * 8;
end;
procedure tdef.ChangeOwner(st:TSymtable);
begin
// if assigned(Owner) then
// Owner.DefList.List[i]:=nil;
Owner:=st;
Owner.DefList.Add(self);
end;
procedure tdef.register_created_object_type;
begin
end;
{****************************************************************************
TSYM (base for all symtypes)
****************************************************************************}
constructor tsym.create(st:tsymtyp;const aname:string);
begin
inherited CreateNotOwned;
realname:=aname;
typ:=st;
RefList:=nil;
symoptions:=[];
fileinfo:=current_tokenpos;
isdbgwritten := false;
visibility:=vis_public;
deprecatedmsg:=nil;
end;
destructor Tsym.destroy;
begin
stringdispose(deprecatedmsg);
if assigned(RefList) then
RefList.Free;
inherited Destroy;
end;
procedure Tsym.IncRefCount;
begin
inc(refs);
if cs_browser in current_settings.moduleswitches then
begin
MaybeCreateRefList;
AddRef;
end;
end;
procedure Tsym.IncRefCountBy(AValue : longint);
begin
inc(refs,AValue);
end;
procedure Tsym.MaybeCreateRefList;
begin
if not assigned(reflist) then
reflist:=TRefLinkedList.create;
end;
procedure Tsym.AddRef;
var
RefItem: TRefItem;
begin
RefItem:=TRefItem.Create(current_tokenpos);
RefList.Concat(RefItem);
end;
procedure Tsym.buildderef;
begin
end;
procedure Tsym.deref;
begin
end;
function tsym.mangledname : string;
begin
internalerror(200204171);
result:='';
end;
function tsym.prettyname : string;
begin
result:=realname;
end;
procedure tsym.ChangeOwner(st:TSymtable);
begin
Owner:=st;
inherited ChangeOwner(Owner.SymList);
end;
{****************************************************************************
tpropaccesslist
****************************************************************************}
constructor tpropaccesslist.create;
begin
procdef:=nil; { needed for procedures }
firstsym:=nil;
lastsym:=nil;
end;
destructor tpropaccesslist.destroy;
begin
clear;
end;
function tpropaccesslist.empty:boolean;
begin
empty:=(firstsym=nil);
end;
procedure tpropaccesslist.clear;
var
hp : ppropaccesslistitem;
begin
while assigned(firstsym) do
begin
hp:=firstsym;
firstsym:=firstsym^.next;
dispose(hp);
end;
firstsym:=nil;
lastsym:=nil;
procdef:=nil;
end;
procedure tpropaccesslist.addsym(slt:tsltype;p:tsym);
var
hp : ppropaccesslistitem;
begin
new(hp);
fillchar(hp^,sizeof(tpropaccesslistitem),0);
hp^.sltype:=slt;
hp^.sym:=p;
hp^.symderef.reset;
if assigned(lastsym) then
lastsym^.next:=hp
else
firstsym:=hp;
lastsym:=hp;
end;
procedure tpropaccesslist.addconst(slt:tsltype;v:TConstExprInt;d:tdef);
var
hp : ppropaccesslistitem;
begin
new(hp);
fillchar(hp^,sizeof(tpropaccesslistitem),0);
hp^.sltype:=slt;
hp^.value:=v;
hp^.valuedef:=d;
hp^.valuedefderef.reset;
if assigned(lastsym) then
lastsym^.next:=hp
else
firstsym:=hp;
lastsym:=hp;
end;
procedure tpropaccesslist.addtype(slt:tsltype;d:tdef);
var
hp : ppropaccesslistitem;
begin
new(hp);
fillchar(hp^,sizeof(tpropaccesslistitem),0);
hp^.sltype:=slt;
hp^.def:=d;
hp^.defderef.reset;
if assigned(lastsym) then
lastsym^.next:=hp
else
firstsym:=hp;
lastsym:=hp;
end;
procedure tpropaccesslist.addsymderef(slt:tsltype;d:tderef);
begin
addsym(slt,nil);
lastsym^.symderef:=d;
end;
procedure tpropaccesslist.addconstderef(slt:tsltype;v:TConstExprInt;d:tderef);
begin
addconst(slt,v,nil);
lastsym^.valuedefderef:=d;
end;
procedure tpropaccesslist.addtypederef(slt:tsltype;d:tderef);
begin
addtype(slt,nil);
lastsym^.defderef:=d;
end;
procedure tpropaccesslist.resolve;
var
hp : ppropaccesslistitem;
begin
procdef:=tdef(procdefderef.resolve);
hp:=firstsym;
while assigned(hp) do
begin
case hp^.sltype of
sl_call,
sl_load,
sl_subscript :
hp^.sym:=tsym(hp^.symderef.resolve);
sl_absolutetype,
sl_typeconv :
hp^.def:=tdef(hp^.defderef.resolve);
sl_vec:
hp^.valuedef:=tdef(hp^.valuedefderef.resolve);
else
internalerror(200110205);
end;
hp:=hp^.next;
end;
end;
procedure tpropaccesslist.buildderef;
var
hp : ppropaccesslistitem;
begin
procdefderef.build(procdef);
hp:=firstsym;
while assigned(hp) do
begin
case hp^.sltype of
sl_call,
sl_load,
sl_subscript :
hp^.symderef.build(hp^.sym);
sl_absolutetype,
sl_typeconv :
hp^.defderef.build(hp^.def);
sl_vec:
hp^.valuedefderef.build(hp^.valuedef);
else
internalerror(200110205);
end;
hp:=hp^.next;
end;
end;
{****************************************************************************
Tderef
****************************************************************************}
procedure tderef.reset;
begin
dataidx:=-1;
end;
procedure tderef.build(s:TObject);
var
len : byte;
st : TSymtable;
data : array[0..255] of byte;
idx : word;
begin
{ skip length byte }
len:=1;
if assigned(s) then
begin
{ TODO: ugly hack}
if s is tsym then
st:=FindUnitSymtable(tsym(s).owner)
else
st:=FindUnitSymtable(tdef(s).owner);
if not st.iscurrentunit then
begin
{ register that the unit is needed for resolving }
data[len]:=ord(deref_unit);
idx:=current_module.derefidx_unit(st.moduleid);
data[len+1]:=idx shr 8 and $ff;
data[len+2]:=idx and $ff;
inc(len,3);
end;
if s is tsym then
begin
data[len]:=ord(deref_symid);
data[len+1]:=tsym(s).symid shr 24 and $ff;
data[len+2]:=tsym(s).symid shr 16 and $ff;
data[len+3]:=tsym(s).symid shr 8 and $ff;
data[len+4]:=tsym(s).symid and $ff;
inc(len,5);
end
else
begin
data[len]:=ord(deref_defid);
data[len+1]:=tdef(s).defid shr 24 and $ff;
data[len+2]:=tdef(s).defid shr 16 and $ff;
data[len+3]:=tdef(s).defid shr 8 and $ff;
data[len+4]:=tdef(s).defid and $ff;
inc(len,5);
end;
end
else
begin
{ nil pointer }
data[len]:=ord(deref_nil);
inc(len);
end;
{ store data length in first byte }
data[0]:=len-1;
{ store index and write to derefdata }
dataidx:=current_module.derefdata.size;
current_module.derefdata.write(data,len);
end;
function tderef.resolve:TObject;
var
pm : tmodule;
typ : tdereftype;
idx : longint;
i : aint;
len : byte;
data : array[0..255] of byte;
begin
result:=nil;
{ not initialized or error }
if dataidx<0 then
internalerror(200306067);
{ read data }
current_module.derefdata.seek(dataidx);
if current_module.derefdata.read(len,1)<>1 then
internalerror(200310221);
if len>0 then
begin
if current_module.derefdata.read(data,len)<>len then
internalerror(200310222);
end;
{ process data }
pm:=current_module;
i:=0;
while (i<len) do
begin
typ:=tdereftype(data[i]);
inc(i);
case typ of
deref_unit :
begin
idx:=(data[i] shl 8) or data[i+1];
inc(i,2);
pm:=current_module.resolve_unit(idx);
end;
deref_defid :
begin
idx:=longint((data[i] shl 24) or (data[i+1] shl 16) or (data[i+2] shl 8) or data[i+3]);
inc(i,4);
result:=tdef(pm.deflist[idx]);
end;
deref_symid :
begin
idx:=longint((data[i] shl 24) or (data[i+1] shl 16) or (data[i+2] shl 8) or data[i+3]);
inc(i,4);
result:=tsym(pm.symlist[idx]);
end;
deref_nil :
begin
result:=nil;
{ Only allowed when no other deref is available }
if len<>1 then
internalerror(200306232);
end;
else
internalerror(200212277);
end;
end;
end;
{*****************************************************************************
TCompilerPPUFile
*****************************************************************************}
procedure tcompilerppufile.checkerror;
begin
if error then
Message(unit_f_ppu_read_error);
end;
procedure tcompilerppufile.getguid(var g: tguid);
begin
longint(g.d1):=getlongint;
g.d2:=getword;
g.d3:=getword;
getdata(g.d4,sizeof(g.d4));
end;
function tcompilerppufile.getexprint:Tconstexprint;
begin
getexprint.overflow:=false;
getexprint.signed:=boolean(getbyte);
getexprint.svalue:=getint64;
end;
function tcompilerppufile.getPtrUInt:TConstPtrUInt;
begin
{$if sizeof(TConstPtrUInt)=8}
result:=tconstptruint(getint64);
{$else}
result:=TConstPtrUInt(getlongint);
{$endif}
end;
procedure tcompilerppufile.getposinfo(var p:tfileposinfo);
var
info : byte;
begin
{
info byte layout in bits:
0-1 - amount of bytes for fileindex
2-3 - amount of bytes for line
4-5 - amount of bytes for column
}
info:=getbyte;
case (info and $03) of
0 : p.fileindex:=getbyte;
1 : p.fileindex:=getword;
2 : p.fileindex:=(getbyte shl 16) or getword;
3 : p.fileindex:=getlongint;
end;
case ((info shr 2) and $03) of
0 : p.line:=getbyte;
1 : p.line:=getword;
2 : p.line:=(getbyte shl 16) or getword;
3 : p.line:=getlongint;
end;
case ((info shr 4) and $03) of
0 : p.column:=getbyte;
1 : p.column:=getword;
2 : p.column:=(getbyte shl 16) or getword;
3 : p.column:=getlongint;
end;
p.moduleindex:=current_module.unit_index;
end;
procedure tcompilerppufile.getderef(var d:tderef);
begin
d.dataidx:=getlongint;
end;
function tcompilerppufile.getpropaccesslist:tpropaccesslist;
var
hderef : tderef;
slt : tsltype;
idx : longint;
p : tpropaccesslist;
begin
p:=tpropaccesslist.create;
getderef(p.procdefderef);
repeat
slt:=tsltype(getbyte);
case slt of
sl_none :
break;
sl_call,
sl_load,
sl_subscript :
begin
getderef(hderef);
p.addsymderef(slt,hderef);
end;
sl_absolutetype,
sl_typeconv :
begin
getderef(hderef);
p.addtypederef(slt,hderef);
end;
sl_vec :
begin
idx:=getlongint;
getderef(hderef);
p.addconstderef(slt,idx,hderef);
end;
else
internalerror(200110204);
end;
until false;
getpropaccesslist:=tpropaccesslist(p);
end;
function tcompilerppufile.getasmsymbol:tasmsymbol;
begin
getlongint;
getasmsymbol:=nil;
end;
procedure tcompilerppufile.putposinfo(const p:tfileposinfo);
var
oldcrc : boolean;
info : byte;
begin
{ posinfo is not relevant for changes in PPU }
oldcrc:=do_crc;
do_crc:=false;
{
info byte layout in bits:
0-1 - amount of bytes for fileindex
2-3 - amount of bytes for line
4-5 - amount of bytes for column
}
info:=0;
{ calculate info byte }
if (p.fileindex>$ff) then
begin
info:=info or $1;
{ uncomment this code if tfileposinfo.fileindex type was changed
if (p.fileindex<=$ffff) then
info:=info or $1
else
if (p.fileindex<=$ffffff) then
info:=info or $2
else
info:=info or $3;
}
end;
if (p.line>$ff) then
begin
if (p.line<=$ffff) then
info:=info or $4
else
if (p.line<=$ffffff) then
info:=info or $8
else
info:=info or $c;
end;
if (p.column>$ff) then
begin
info:=info or $10;
{ uncomment this code if tfileposinfo.column type was changed
if (p.column<=$ffff) then
info:=info or $10
else
if (p.column<=$ffffff) then
info:=info or $20
else
info:=info or $30;
}
end;
{ write data }
putbyte(info);
case (info and $03) of
0 : putbyte(p.fileindex);
1 : putword(p.fileindex);
2 : begin
putbyte(p.fileindex shr 16);
putword(p.fileindex and $ffff);
end;
3 : putlongint(p.fileindex);
end;
case ((info shr 2) and $03) of
0 : putbyte(p.line);
1 : putword(p.line);
2 : begin
putbyte(p.line shr 16);
putword(p.line and $ffff);
end;
3 : putlongint(p.line);
end;
case ((info shr 4) and $03) of
0 : putbyte(p.column);
1 : putword(p.column);
2 : begin
putbyte(p.column shr 16);
putword(p.column and $ffff);
end;
3 : putlongint(p.column);
end;
do_crc:=oldcrc;
end;
procedure tcompilerppufile.putguid(const g: tguid);
begin
putlongint(longint(g.d1));
putword(g.d2);
putword(g.d3);
putdata(g.d4,sizeof(g.d4));
end;
procedure Tcompilerppufile.putexprint(const v:Tconstexprint);
begin
if v.overflow then
internalerror(200706102);
putbyte(byte(v.signed));
putint64(v.svalue);
end;
procedure tcompilerppufile.PutPtrUInt(v:TConstPtrUInt);
begin
{$if sizeof(TConstPtrUInt)=8}
putint64(int64(v));
{$else}
putlongint(longint(v));
{$endif}
end;
procedure tcompilerppufile.putderef(const d:tderef);
var
oldcrc : boolean;
begin
oldcrc:=do_crc;
do_crc:=false;
putlongint(d.dataidx);
do_crc:=oldcrc;
end;
procedure tcompilerppufile.putpropaccesslist(p:tpropaccesslist);
var
hp : ppropaccesslistitem;
begin
putderef(p.procdefderef);
hp:=p.firstsym;
while assigned(hp) do
begin
putbyte(byte(hp^.sltype));
case hp^.sltype of
sl_call,
sl_load,
sl_subscript :
putderef(hp^.symderef);
sl_absolutetype,
sl_typeconv :
putderef(hp^.defderef);
sl_vec :
begin
putlongint(int64(hp^.value));
putderef(hp^.valuedefderef);
end;
else
internalerror(200110205);
end;
hp:=hp^.next;
end;
putbyte(byte(sl_none));
end;
procedure tcompilerppufile.putasmsymbol(s:tasmsymbol);
begin
putlongint(0);
end;
{$ifdef MEMDEBUG}
initialization
memmanglednames:=TMemDebug.create('Manglednames');
memmanglednames.stop;
memprocpara:=TMemDebug.create('ProcPara');
memprocpara.stop;
memprocparast:=TMemDebug.create('ProcParaSt');
memprocparast.stop;
memproclocalst:=TMemDebug.create('ProcLocalSt');
memproclocalst.stop;
memprocnodetree:=TMemDebug.create('ProcNodeTree');
memprocnodetree.stop;
finalization
memmanglednames.free;
memprocpara.free;
memprocparast.free;
memproclocalst.free;
memprocnodetree.free;
{$endif MEMDEBUG}
end.
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