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|
{
Copyright (c) 1998-2002 by Florian Klaempfl
Generates VMT for classes/objects and interface wrappers
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 ncgvmt;
{$i fpcdefs.inc}
interface
uses
aasmdata,aasmbase,
symbase,symdef;
type
pprocdeftree = ^tprocdeftree;
tprocdeftree = record
data : tprocdef;
nl : tasmlabel;
l,r : pprocdeftree;
end;
TVMTWriter=class
private
_Class : tobjectdef;
{ message tables }
root : pprocdeftree;
procedure disposeprocdeftree(p : pprocdeftree);
procedure insertmsgint(p:TObject;arg:pointer);
procedure insertmsgstr(p:TObject;arg:pointer);
procedure insertint(p : pprocdeftree;var at : pprocdeftree;var count:longint);
procedure insertstr(p : pprocdeftree;var at : pprocdeftree;var count:longint);
function RedirectToEmpty(procdef: tprocdef): boolean;
procedure writenames(list : TAsmList;p : pprocdeftree);
procedure writeintentry(list : TAsmList;p : pprocdeftree);
procedure writestrentry(list : TAsmList;p : pprocdeftree);
{$ifdef WITHDMT}
{ dmt }
procedure insertdmtentry(p:TObject;arg:pointer);
procedure writedmtindexentry(p : pprocdeftree);
procedure writedmtaddressentry(p : pprocdeftree);
{$endif}
{ published methods }
procedure do_count_published_methods(p:TObject;arg:pointer);
procedure do_gen_published_methods(p:TObject;arg:pointer);
{ virtual methods }
procedure writevirtualmethods(List:TAsmList);
{ interface tables }
function intf_get_vtbl_name(AImplIntf:TImplementedInterface): string;
procedure intf_create_vtbl(rawdata: TAsmList;AImplIntf:TImplementedInterface);
procedure intf_gen_intf_ref(rawdata: TAsmList;AImplIntf:TImplementedInterface);
function intf_write_table(list : TAsmList):TAsmLabel;
{ generates the message tables for a class }
function genstrmsgtab(list : TAsmList) : tasmlabel;
function genintmsgtab(list : TAsmList) : tasmlabel;
function genpublishedmethodstable(list : TAsmList) : tasmlabel;
function generate_field_table(list : TAsmList) : tasmlabel;
procedure generate_abstract_stub(list:TAsmList;pd:tprocdef);
{$ifdef WITHDMT}
{ generates a DMT for _class }
function gendmt : tasmlabel;
{$endif WITHDMT}
public
constructor create(c:tobjectdef); virtual;
{ write the VMT to al_globals }
procedure writevmt;
procedure writeinterfaceids(list: TAsmList);
{ should the VMT writer be used at all (e.g., not for the JVM target) }
class function use_vmt_writer: boolean; virtual;
end;
TVMTWriterClass = class of TVMTWriter;
{ generate persistent type information like VMT, RTTI and inittables }
procedure write_persistent_type_info(st:tsymtable;is_global:boolean);
var
CVMTWriter: TVMTWriterClass = TVMTWriter;
implementation
uses
cutils,cclasses,
globtype,globals,verbose,constexp,
systems,
symconst,symtype,symsym,symtable,defutil,
aasmtai,
wpobase,
nobj,
cgbase,parabase,paramgr,cgobj,cgcpu,hlcgobj,hlcgcpu,
ncgrtti;
{*****************************************************************************
TVMTWriter
*****************************************************************************}
constructor TVMTWriter.create(c:tobjectdef);
begin
inherited Create;
_Class:=c;
end;
{**************************************
Message Tables
**************************************}
procedure TVMTWriter.disposeprocdeftree(p : pprocdeftree);
begin
if assigned(p^.l) then
disposeprocdeftree(p^.l);
if assigned(p^.r) then
disposeprocdeftree(p^.r);
dispose(p);
end;
procedure TVMTWriter.insertint(p : pprocdeftree;var at : pprocdeftree;var count:longint);
begin
if at=nil then
begin
at:=p;
inc(count);
end
else
begin
if p^.data.messageinf.i<at^.data.messageinf.i then
insertint(p,at^.l,count)
else if p^.data.messageinf.i>at^.data.messageinf.i then
insertint(p,at^.r,count)
else
Message1(parser_e_duplicate_message_label,tostr(p^.data.messageinf.i));
end;
end;
procedure TVMTWriter.insertstr(p : pprocdeftree;var at : pprocdeftree;var count:longint);
var
i : integer;
begin
if at=nil then
begin
at:=p;
inc(count);
end
else
begin
i:=CompareStr(p^.data.messageinf.str^,at^.data.messageinf.str^);
if i<0 then
insertstr(p,at^.l,count)
else if i>0 then
insertstr(p,at^.r,count)
else
Message1(parser_e_duplicate_message_label,p^.data.messageinf.str^);
end;
end;
procedure TVMTWriter.insertmsgint(p:TObject;arg:pointer);
var
i : longint;
pd : Tprocdef;
pt : pprocdeftree;
begin
if tsym(p).typ<>procsym then
exit;
for i:=0 to Tprocsym(p).ProcdefList.Count-1 do
begin
pd:=tprocdef(Tprocsym(p).ProcdefList[i]);
if po_msgint in pd.procoptions then
begin
new(pt);
pt^.data:=pd;
pt^.l:=nil;
pt^.r:=nil;
insertint(pt,root,plongint(arg)^);
end;
end;
end;
procedure TVMTWriter.insertmsgstr(p:TObject;arg:pointer);
var
i : longint;
pd : Tprocdef;
pt : pprocdeftree;
begin
if tsym(p).typ<>procsym then
exit;
for i:=0 to Tprocsym(p).ProcdefList.Count-1 do
begin
pd:=tprocdef(Tprocsym(p).ProcdefList[i]);
if po_msgstr in pd.procoptions then
begin
new(pt);
pt^.data:=pd;
pt^.l:=nil;
pt^.r:=nil;
insertstr(pt,root,plongint(arg)^);
end;
end;
end;
procedure TVMTWriter.writenames(list : TAsmList;p : pprocdeftree);
var
ca : pchar;
len : byte;
begin
current_asmdata.getdatalabel(p^.nl);
if assigned(p^.l) then
writenames(list,p^.l);
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_label.Create(p^.nl));
len:=length(p^.data.messageinf.str^);
list.concat(tai_const.create_8bit(len));
getmem(ca,len+1);
move(p^.data.messageinf.str^[1],ca^,len);
ca[len]:=#0;
list.concat(Tai_string.Create_pchar(ca,len));
if assigned(p^.r) then
writenames(list,p^.r);
end;
procedure TVMTWriter.writestrentry(list : TAsmList;p : pprocdeftree);
begin
if assigned(p^.l) then
writestrentry(list,p^.l);
{ write name label }
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_const.Create_sym(p^.nl));
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_const.Createname(p^.data.mangledname,AT_FUNCTION,0));
if assigned(p^.r) then
writestrentry(list,p^.r);
end;
function TVMTWriter.genstrmsgtab(list : TAsmList) : tasmlabel;
var
count : longint;
begin
root:=nil;
count:=0;
{ insert all message handlers into a tree, sorted by name }
_class.symtable.SymList.ForEachCall(@insertmsgstr,@count);
{ write all names }
if assigned(root) then
writenames(list,root);
{ now start writing of the message string table }
current_asmdata.getlabel(result,alt_data);
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_label.Create(result));
list.concat(cai_align.create(const_align(sizeof(longint))));
list.concat(Tai_const.Create_32bit(count));
list.concat(cai_align.create(const_align(sizeof(pint))));
if assigned(root) then
begin
writestrentry(list,root);
disposeprocdeftree(root);
end;
end;
procedure TVMTWriter.writeintentry(list : TAsmList;p : pprocdeftree);
begin
if assigned(p^.l) then
writeintentry(list,p^.l);
{ write name label }
list.concat(cai_align.create(const_align(sizeof(longint))));
list.concat(Tai_const.Create_32bit(p^.data.messageinf.i));
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_const.Createname(p^.data.mangledname,AT_FUNCTION,0));
if assigned(p^.r) then
writeintentry(list,p^.r);
end;
function TVMTWriter.genintmsgtab(list : TAsmList) : tasmlabel;
var
r : tasmlabel;
count : longint;
begin
root:=nil;
count:=0;
{ insert all message handlers into a tree, sorted by name }
_class.symtable.SymList.ForEachCall(@insertmsgint,@count);
{ now start writing of the message string table }
current_asmdata.getlabel(r,alt_data);
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_label.Create(r));
genintmsgtab:=r;
list.concat(cai_align.create(const_align(sizeof(longint))));
list.concat(Tai_const.Create_32bit(count));
list.concat(cai_align.create(const_align(sizeof(pint))));
if assigned(root) then
begin
writeintentry(list,root);
disposeprocdeftree(root);
end;
end;
{$ifdef WITHDMT}
{**************************************
DMT
**************************************}
procedure TVMTWriter.insertdmtentry(p:TObject;arg:pointer);
var
hp : tprocdef;
pt : pprocdeftree;
begin
if tsym(p).typ=procsym then
begin
hp:=tprocsym(p).definition;
while assigned(hp) do
begin
if (po_msgint in hp.procoptions) then
begin
new(pt);
pt^.p:=hp;
pt^.l:=nil;
pt^.r:=nil;
insertint(pt,root);
end;
hp:=hp.nextoverloaded;
end;
end;
end;
procedure TVMTWriter.writedmtindexentry(p : pprocdeftree);
begin
if assigned(p^.l) then
writedmtindexentry(p^.l);
al_globals.concat(Tai_const.Create_32bit(p^.data.messageinf.i));
if assigned(p^.r) then
writedmtindexentry(p^.r);
end;
procedure TVMTWriter.writedmtaddressentry(p : pprocdeftree);
begin
if assigned(p^.l) then
writedmtaddressentry(p^.l);
al_globals.concat(Tai_const_symbol.Createname(p^.data.mangledname,0));
if assigned(p^.r) then
writedmtaddressentry(p^.r);
end;
function TVMTWriter.gendmt : tasmlabel;
var
r : tasmlabel;
begin
root:=nil;
count:=0;
gendmt:=nil;
{ insert all message handlers into a tree, sorted by number }
_class.symtable.SymList.ForEachCall(insertdmtentry);
if count>0 then
begin
current_asmdata.getdatalabel(r);
gendmt:=r;
al_globals.concat(cai_align.create(const_align(sizeof(pint))));
al_globals.concat(Tai_label.Create(r));
{ entries for caching }
al_globals.concat(Tai_const.Create_ptr(0));
al_globals.concat(Tai_const.Create_ptr(0));
al_globals.concat(Tai_const.Create_32bit(count));
if assigned(root) then
begin
writedmtindexentry(root);
writedmtaddressentry(root);
disposeprocdeftree(root);
end;
end;
end;
{$endif WITHDMT}
{**************************************
Published Methods
**************************************}
procedure TVMTWriter.do_count_published_methods(p:TObject;arg:pointer);
var
i : longint;
pd : tprocdef;
begin
if (tsym(p).typ<>procsym) then
exit;
for i:=0 to Tprocsym(p).ProcdefList.Count-1 do
begin
pd:=tprocdef(Tprocsym(p).ProcdefList[i]);
if (pd.procsym=tsym(p)) and
(pd.visibility=vis_published) then
inc(plongint(arg)^);
end;
end;
procedure TVMTWriter.do_gen_published_methods(p:TObject;arg:pointer);
var
i : longint;
l : tasmlabel;
pd : tprocdef;
lists: ^TAsmList absolute arg;
begin
if (tsym(p).typ<>procsym) then
exit;
for i:=0 to Tprocsym(p).ProcdefList.Count-1 do
begin
pd:=tprocdef(Tprocsym(p).ProcdefList[i]);
if (pd.procsym=tsym(p)) and
(pd.visibility=vis_published) then
begin
current_asmdata.getlabel(l,alt_data);
lists[1].concat(cai_align.Create(const_align(sizeof(pint))));
lists[1].concat(Tai_label.Create(l));
lists[1].concat(Tai_const.Create_8bit(length(tsym(p).realname)));
lists[1].concat(Tai_string.Create(tsym(p).realname));
lists[0].concat(Tai_const.Create_sym(l));
if po_abstractmethod in pd.procoptions then
lists[0].concat(Tai_const.Create_nil_codeptr)
else
lists[0].concat(Tai_const.Createname(pd.mangledname,AT_FUNCTION,0));
end;
end;
end;
function TVMTWriter.genpublishedmethodstable(list : TAsmList) : tasmlabel;
var
l : tasmlabel;
count : longint;
lists : array[0..1] of TAsmList;
begin
count:=0;
_class.symtable.SymList.ForEachCall(@do_count_published_methods,@count);
if count>0 then
begin
lists[0]:=list;
lists[1]:=TAsmList.Create;
current_asmdata.getlabel(l,alt_data);
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_label.Create(l));
list.concat(Tai_const.Create_32bit(count));
_class.symtable.SymList.ForEachCall(@do_gen_published_methods,@lists);
list.concatlist(lists[1]);
lists[1].Free;
genpublishedmethodstable:=l;
end
else
genpublishedmethodstable:=nil;
end;
function TVMTWriter.generate_field_table(list : TAsmList) : tasmlabel;
var
i : longint;
sym : tsym;
fieldtable,
classtable : tasmlabel;
classindex,
fieldcount : longint;
classtablelist : TFPList;
begin
classtablelist:=TFPList.Create;
{ retrieve field info fields }
fieldcount:=0;
for i:=0 to _class.symtable.SymList.Count-1 do
begin
sym:=tsym(_class.symtable.SymList[i]);
if (sym.typ=fieldvarsym) and
(sym.visibility=vis_published) then
begin
if tfieldvarsym(sym).vardef.typ<>objectdef then
internalerror(200611032);
classindex:=classtablelist.IndexOf(tfieldvarsym(sym).vardef);
if classindex=-1 then
classtablelist.Add(tfieldvarsym(sym).vardef);
inc(fieldcount);
end;
end;
if fieldcount>0 then
begin
current_asmdata.getlabel(fieldtable,alt_data);
current_asmdata.getlabel(classtable,alt_data);
list.concat(cai_align.create(const_align(sizeof(pint))));
{ write fields }
list.concat(Tai_label.Create(fieldtable));
list.concat(Tai_const.Create_16bit(fieldcount));
if (tf_requires_proper_alignment in target_info.flags) then
list.concat(cai_align.Create(sizeof(TConstPtrUInt)));
list.concat(Tai_const.Create_sym(classtable));
for i:=0 to _class.symtable.SymList.Count-1 do
begin
sym:=tsym(_class.symtable.SymList[i]);
if (sym.typ=fieldvarsym) and
(sym.visibility=vis_published) then
begin
if (tf_requires_proper_alignment in target_info.flags) then
list.concat(cai_align.Create(sizeof(pint)));
list.concat(Tai_const.Create_pint(tfieldvarsym(sym).fieldoffset));
classindex:=classtablelist.IndexOf(tfieldvarsym(sym).vardef);
if classindex=-1 then
internalerror(200611033);
list.concat(Tai_const.Create_16bit(classindex+1));
list.concat(Tai_const.Create_8bit(length(tfieldvarsym(sym).realname)));
list.concat(Tai_string.Create(tfieldvarsym(sym).realname));
end;
end;
{ generate the class table }
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_label.Create(classtable));
list.concat(Tai_const.Create_16bit(classtablelist.count));
if (tf_requires_proper_alignment in target_info.flags) then
list.concat(cai_align.Create(sizeof(TConstPtrUInt)));
for i:=0 to classtablelist.Count-1 do
list.concat(Tai_const.Createname(tobjectdef(classtablelist[i]).vmt_mangledname,AT_DATA,0));
result:=fieldtable;
end
else
result:=nil;
classtablelist.free;
end;
{**************************************
Interface tables
**************************************}
function TVMTWriter.intf_get_vtbl_name(AImplIntf:TImplementedInterface): string;
begin
result:=make_mangledname('VTBL',_class.owner,_class.objname^+'_$_'+AImplIntf.IntfDef.objname^);
end;
procedure TVMTWriter.intf_create_vtbl(rawdata: TAsmList;AImplIntf:TImplementedInterface);
var
pd : tprocdef;
vtblstr,
hs : string;
i : longint;
begin
vtblstr:=intf_get_vtbl_name(AImplIntf);
rawdata.concat(cai_align.create(const_align(sizeof(pint))));
rawdata.concat(tai_symbol.createname(vtblstr,AT_DATA,0));
if assigned(AImplIntf.procdefs) then
begin
for i:=0 to AImplIntf.procdefs.count-1 do
begin
pd:=tprocdef(AImplIntf.procdefs[i]);
hs:=make_mangledname('WRPR',_class.owner,_class.objname^+'_$_'+AImplIntf.IntfDef.objname^+'_$_'+
tostr(i)+'_$_'+pd.mangledname);
{ create reference }
rawdata.concat(Tai_const.Createname(hs,AT_FUNCTION,0));
end;
end;
rawdata.concat(tai_symbol_end.createname(vtblstr));
end;
procedure TVMTWriter.intf_gen_intf_ref(rawdata: TAsmList;AImplIntf:TImplementedInterface);
var
pd: tprocdef;
begin
{ GUID (or nil for Corba interfaces) }
if AImplIntf.IntfDef.objecttype in [odt_interfacecom] then
rawdata.concat(Tai_const.CreateName(
make_mangledname('IID',AImplIntf.IntfDef.owner,AImplIntf.IntfDef.objname^),AT_DATA,0))
else
rawdata.concat(Tai_const.Create_nil_dataptr);
{ VTable }
rawdata.concat(Tai_const.Createname(intf_get_vtbl_name(AImplIntf.VtblImplIntf),AT_DATA,0));
{ IOffset field }
case AImplIntf.VtblImplIntf.IType of
etFieldValue, etFieldValueClass,
etStandard:
rawdata.concat(Tai_const.Create_pint(AImplIntf.VtblImplIntf.IOffset));
etStaticMethodResult, etStaticMethodClass:
rawdata.concat(Tai_const.Createname(
tprocdef(tpropertysym(AImplIntf.ImplementsGetter).propaccesslist[palt_read].procdef).mangledname,
AT_FUNCTION,
0
));
etVirtualMethodResult, etVirtualMethodClass:
begin
pd := tprocdef(tpropertysym(AImplIntf.ImplementsGetter).propaccesslist[palt_read].procdef);
rawdata.concat(Tai_const.Create_pint(tobjectdef(pd.struct).vmtmethodoffset(pd.extnumber)));
end;
else
internalerror(200802162);
end;
{ IIDStr }
rawdata.concat(Tai_const.CreateName(
make_mangledname('IIDSTR',AImplIntf.IntfDef.owner,AImplIntf.IntfDef.objname^),AT_DATA,0));
{ IType }
rawdata.concat(Tai_const.Create_pint(aint(AImplIntf.VtblImplIntf.IType)));
end;
function TVMTWriter.intf_write_table(list : TAsmList):TAsmLabel;
var
i : longint;
ImplIntf : TImplementedInterface;
begin
current_asmdata.getlabel(result,alt_data);
list.concat(cai_align.create(const_align(sizeof(pint))));
list.concat(Tai_label.Create(result));
list.concat(Tai_const.Create_pint(_class.ImplementedInterfaces.count));
{ Write vtbl references }
for i:=0 to _class.ImplementedInterfaces.count-1 do
begin
ImplIntf:=TImplementedInterface(_class.ImplementedInterfaces[i]);
intf_gen_intf_ref(list,ImplIntf);
end;
{ Write vtbls }
for i:=0 to _class.ImplementedInterfaces.count-1 do
begin
ImplIntf:=TImplementedInterface(_class.ImplementedInterfaces[i]);
if ImplIntf.VtblImplIntf=ImplIntf then
intf_create_vtbl(list,ImplIntf);
end;
end;
{ Write interface identifiers to the data section }
procedure TVMTWriter.writeinterfaceids(list: TAsmList);
var
i : longint;
s : string;
begin
if assigned(_class.iidguid) then
begin
s:=make_mangledname('IID',_class.owner,_class.objname^);
maybe_new_object_file(list);
new_section(list,sec_rodata_norel,s,const_align(sizeof(pint)));
list.concat(Tai_symbol.Createname_global(s,AT_DATA,0));
list.concat(Tai_const.Create_32bit(longint(_class.iidguid^.D1)));
list.concat(Tai_const.Create_16bit(_class.iidguid^.D2));
list.concat(Tai_const.Create_16bit(_class.iidguid^.D3));
for i:=Low(_class.iidguid^.D4) to High(_class.iidguid^.D4) do
list.concat(Tai_const.Create_8bit(_class.iidguid^.D4[i]));
end;
maybe_new_object_file(list);
s:=make_mangledname('IIDSTR',_class.owner,_class.objname^);
new_section(list,sec_rodata_norel,s,sizeof(pint));
list.concat(Tai_symbol.Createname_global(s,AT_DATA,0));
list.concat(Tai_const.Create_8bit(length(_class.iidstr^)));
list.concat(Tai_string.Create(_class.iidstr^));
end;
class function TVMTWriter.use_vmt_writer: boolean;
begin
result:=true;
end;
function TVMTWriter.RedirectToEmpty(procdef : tprocdef) : boolean;
var
i : longint;
hp : PCGParaLocation;
begin
result:=false;
if procdef.isempty then
begin
{$ifdef x86}
paramanager.create_funcretloc_info(procdef,calleeside);
if (procdef.funcretloc[calleeside].Location^.loc=LOC_FPUREGISTER) then
exit;
{$endif x86}
procdef.init_paraloc_info(callerside);
{ we can redirect the call if no memory parameter is passed }
for i:=0 to procdef.paras.count-1 do
begin
hp:=tparavarsym(procdef.paras[i]).paraloc[callerside].Location;
while assigned(hp) do
begin
if not(hp^.Loc in [LOC_REGISTER,LOC_MMREGISTER,LOC_FPUREGISTER]) then
exit;
hp:=hp^.Next;
end;
end;
result:=true;
end;
end;
procedure TVMTWriter.generate_abstract_stub(list:TAsmList;pd:tprocdef);
var
sym: TAsmSymbol;
begin
{ Generate stubs for abstract methods, so their symbols are present and
can be used e.g. to take address (see issue #24536). }
if (po_global in pd.procoptions) and
(pd.owner.defowner<>self._class) then
exit;
sym:=current_asmdata.GetAsmSymbol(pd.mangledname);
if assigned(sym) and (sym.bind<>AB_EXTERNAL) then
exit;
maybe_new_object_file(list);
new_section(list,sec_code,lower(pd.mangledname),target_info.alignment.procalign);
if (po_global in pd.procoptions) then
begin
sym:=current_asmdata.DefineAsmSymbol(pd.mangledname,AB_GLOBAL,AT_FUNCTION);
list.concat(Tai_symbol.Create_global(sym,0));
end
else
begin
sym:=current_asmdata.DefineAsmSymbol(pd.mangledname,AB_LOCAL,AT_FUNCTION);
list.concat(Tai_symbol.Create(sym,0));
end;
cg.g_external_wrapper(list,pd,'FPC_ABSTRACTERROR');
list.concat(Tai_symbol_end.Create(sym));
end;
procedure TVMTWriter.writevirtualmethods(List:TAsmList);
var
vmtpd : tprocdef;
vmtentry : pvmtentry;
i : longint;
procname : TSymStr;
{$ifdef vtentry}
hs : string;
{$endif vtentry}
begin
if not assigned(_class.VMTEntries) then
exit;
for i:=0 to _class.VMTEntries.Count-1 do
begin
vmtentry:=pvmtentry(_class.vmtentries[i]);
vmtpd:=vmtentry^.procdef;
{ safety checks }
if not(po_virtualmethod in vmtpd.procoptions) then
internalerror(200611082);
if vmtpd.extnumber<>i then
internalerror(200611083);
if (po_abstractmethod in vmtpd.procoptions) then
begin
procname:='FPC_ABSTRACTERROR';
generate_abstract_stub(current_asmdata.AsmLists[al_procedures],vmtpd);
end
else if (cs_opt_remove_emtpy_proc in current_settings.optimizerswitches) and RedirectToEmpty(vmtpd) then
procname:='FPC_EMPTYMETHOD'
else if not wpoinfomanager.optimized_name_for_vmt(_class,vmtpd,procname) then
procname:=vmtpd.mangledname;
List.concat(Tai_const.createname(procname,AT_FUNCTION,0));
{$ifdef vtentry}
hs:='VTENTRY'+'_'+_class.vmt_mangledname+'$$'+tostr(_class.vmtmethodoffset(i) div sizeof(pint));
current_asmdata.asmlists[al_globals].concat(tai_symbol.CreateName(hs,AT_DATA,0));
{$endif vtentry}
end;
end;
procedure TVMTWriter.writevmt;
var
methodnametable,intmessagetable,
strmessagetable,classnamelabel,
fieldtablelabel : tasmlabel;
hs: string;
{$ifdef WITHDMT}
dmtlabel : tasmlabel;
{$endif WITHDMT}
interfacetable : tasmlabel;
templist : TAsmList;
begin
{$ifdef WITHDMT}
dmtlabel:=gendmt;
{$endif WITHDMT}
templist:=TAsmList.Create;
strmessagetable:=nil;
interfacetable:=nil;
fieldtablelabel:=nil;
methodnametable:=nil;
intmessagetable:=nil;
classnamelabel:=nil;
{ write tables for classes, this must be done before the actual
class is written, because we need the labels defined }
if is_class(_class) then
begin
{ write class name }
current_asmdata.getlabel(classnamelabel,alt_data);
templist.concat(cai_align.create(const_align(sizeof(pint))));
templist.concat(Tai_label.Create(classnamelabel));
hs:=_class.RttiName;
templist.concat(Tai_const.Create_8bit(length(hs)));
templist.concat(Tai_string.Create(hs));
{ interface table }
if _class.ImplementedInterfaces.count>0 then
interfacetable:=intf_write_table(templist);
methodnametable:=genpublishedmethodstable(templist);
fieldtablelabel:=generate_field_table(templist);
{ generate message and dynamic tables }
if (oo_has_msgstr in _class.objectoptions) then
strmessagetable:=genstrmsgtab(templist);
if (oo_has_msgint in _class.objectoptions) then
intmessagetable:=genintmsgtab(templist);
end;
{ write debug info }
maybe_new_object_file(current_asmdata.asmlists[al_globals]);
new_section(current_asmdata.asmlists[al_globals],sec_rodata,_class.vmt_mangledname,const_align(sizeof(pint)));
current_asmdata.asmlists[al_globals].concat(Tai_symbol.Createname_global(_class.vmt_mangledname,AT_DATA,0));
{ determine the size with symtable.datasize, because }
{ size gives back 4 for classes }
current_asmdata.asmlists[al_globals].concat(Tai_const.Create(aitconst_ptr,tObjectSymtable(_class.symtable).datasize));
current_asmdata.asmlists[al_globals].concat(Tai_const.Create(aitconst_ptr,-int64(tObjectSymtable(_class.symtable).datasize)));
{$ifdef WITHDMT}
if _class.classtype=ct_object then
begin
if assigned(dmtlabel) then
current_asmdata.asmlists[al_globals].concat(Tai_const_symbol.Create(dmtlabel)))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_ptr(0));
end;
{$endif WITHDMT}
{ write pointer to parent VMT, this isn't implemented in TP }
{ but this is not used in FPC ? (PM) }
{ it's not used yet, but the delphi-operators as and is need it (FK) }
{ it is not written for parents that don't have any vmt !! }
if assigned(_class.childof) and
(oo_has_vmt in _class.childof.objectoptions) then
current_asmdata.asmlists[al_globals].concat(Tai_const.Createname(_class.childof.vmt_mangledname,AT_DATA,0))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
{ write extended info for classes, for the order see rtl/inc/objpash.inc }
if is_class(_class) then
begin
{ pointer to class name string }
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(classnamelabel));
{ pointer to dynamic table or nil }
if (oo_has_msgint in _class.objectoptions) then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(intmessagetable))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
{ pointer to method table or nil }
if assigned(methodnametable) then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(methodnametable))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
{ pointer to field table }
if assigned(fieldtablelabel) then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(fieldtablelabel))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
{ pointer to type info of published section }
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(RTTIWriter.get_rtti_label(_class,fullrtti)));
{ inittable for con-/destruction }
if _class.members_need_inittable then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(RTTIWriter.get_rtti_label(_class,initrtti)))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
{ auto table }
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
{ interface table }
if _class.ImplementedInterfaces.count>0 then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(interfacetable))
else if _class.implements_any_interfaces then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr)
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(current_asmdata.RefAsmSymbol('FPC_EMPTYINTF',AT_DATA)));
{ table for string messages }
if (oo_has_msgstr in _class.objectoptions) then
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_sym(strmessagetable))
else
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_dataptr);
end;
{ write virtual methods }
writevirtualmethods(current_asmdata.asmlists[al_globals]);
current_asmdata.asmlists[al_globals].concat(Tai_const.Create_nil_codeptr);
{ write the size of the VMT }
current_asmdata.asmlists[al_globals].concat(Tai_symbol_end.Createname(_class.vmt_mangledname));
{$ifdef vtentry}
{ write vtinherit symbol to notify the linker of the class inheritance tree }
hs:='VTINHERIT'+'_'+_class.vmt_mangledname+'$$';
if assigned(_class.childof) then
hs:=hs+_class.childof.vmt_mangledname
else
hs:=hs+_class.vmt_mangledname;
current_asmdata.asmlists[al_globals].concat(tai_symbol.CreateName(hs,AT_DATA,0));
{$endif vtentry}
if is_class(_class) then
current_asmdata.asmlists[al_globals].concatlist(templist);
templist.Free;
end;
procedure gen_intf_wrapper(list:TAsmList;_class:tobjectdef);
var
i,j : longint;
tmps : string;
pd : TProcdef;
ImplIntf : TImplementedInterface;
begin
for i:=0 to _class.ImplementedInterfaces.count-1 do
begin
ImplIntf:=TImplementedInterface(_class.ImplementedInterfaces[i]);
if (ImplIntf=ImplIntf.VtblImplIntf) and
assigned(ImplIntf.ProcDefs) then
begin
for j:=0 to ImplIntf.ProcDefs.Count-1 do
begin
pd:=TProcdef(ImplIntf.ProcDefs[j]);
{ we don't track method calls via interfaces yet ->
assume that every method called via an interface call
is reachable for now }
if (po_virtualmethod in pd.procoptions) and
not is_objectpascal_helper(tprocdef(pd).struct) then
tobjectdef(tprocdef(pd).struct).register_vmt_call(tprocdef(pd).extnumber);
tmps:=make_mangledname('WRPR',_class.owner,_class.objname^+'_$_'+
ImplIntf.IntfDef.objname^+'_$_'+tostr(j)+'_$_'+pd.mangledname);
{ create wrapper code }
new_section(list,sec_code,tmps,target_info.alignment.procalign);
hlcg.init_register_allocators;
cg.g_intf_wrapper(list,pd,tmps,ImplIntf.ioffset);
hlcg.done_register_allocators;
end;
end;
end;
end;
procedure do_write_persistent_type_info(st:tsymtable;is_global:boolean);
var
i : longint;
def : tdef;
vmtwriter : TVMTWriter;
begin
if not CVMTWriter.use_vmt_writer then
exit;
for i:=0 to st.DefList.Count-1 do
begin
def:=tdef(st.DefList[i]);
case def.typ of
recorddef :
do_write_persistent_type_info(trecorddef(def).symtable,is_global);
objectdef :
begin
{ Skip generics and forward defs }
if ([df_generic,df_genconstraint]*def.defoptions<>[]) or
(oo_is_forward in tobjectdef(def).objectoptions) then
continue;
do_write_persistent_type_info(tobjectdef(def).symtable,is_global);
{ Write also VMT if not done yet }
if not(ds_vmt_written in def.defstates) then
begin
vmtwriter:=CVMTWriter.create(tobjectdef(def));
if is_interface(tobjectdef(def)) then
vmtwriter.writeinterfaceids(current_asmdata.AsmLists[al_globals]);
if (oo_has_vmt in tobjectdef(def).objectoptions) then
vmtwriter.writevmt;
vmtwriter.free;
include(def.defstates,ds_vmt_written);
end;
if is_class(def) then
gen_intf_wrapper(current_asmdata.asmlists[al_globals],tobjectdef(def));
end;
procdef :
begin
if assigned(tprocdef(def).localst) and
(tprocdef(def).localst.symtabletype=localsymtable) then
do_write_persistent_type_info(tprocdef(def).localst,false);
if assigned(tprocdef(def).parast) then
do_write_persistent_type_info(tprocdef(def).parast,false);
end;
end;
{ generate always persistent tables for types in the interface so it can
be reused in other units and give always the same pointer location. }
{ Init }
if (
assigned(def.typesym) and
is_global and
not is_objc_class_or_protocol(def)
) or
is_managed_type(def) or
(ds_init_table_used in def.defstates) then
RTTIWriter.write_rtti(def,initrtti);
{ RTTI }
if (
assigned(def.typesym) and
is_global and
not is_objc_class_or_protocol(def)
) or
(ds_rtti_table_used in def.defstates) then
RTTIWriter.write_rtti(def,fullrtti);
end;
end;
procedure write_persistent_type_info(st:tsymtable;is_global:boolean);
begin
create_hlcodegen;
do_write_persistent_type_info(st,is_global);
destroy_hlcodegen;
end;
end.
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