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{
Copyright (c) 2018 by Jonas Maebe
This unit provides helpers for creating procdefs
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.
****************************************************************************
}
{$i fpcdefs.inc}
unit procdefutil;
interface
uses
symconst,symtype,symdef;
{ create a nested procdef that will be used to outline code from a procedure;
astruct should usually be nil, except in special cases like the Windows SEH
exception handling funclets }
function create_outline_procdef(const basesymname: string; astruct: tabstractrecorddef; potype: tproctypeoption; resultdef: tdef): tprocdef;
implementation
uses
cutils,
symbase,symsym,symtable,pparautl,globtype;
function create_outline_procdef(const basesymname: string; astruct: tabstractrecorddef; potype: tproctypeoption; resultdef: tdef): tprocdef;
var
st:TSymTable;
checkstack: psymtablestackitem;
oldsymtablestack: tsymtablestack;
sym:tprocsym;
begin
{ get actual procedure symtable (skip withsymtables, etc.) }
st:=nil;
checkstack:=symtablestack.stack;
while assigned(checkstack) do
begin
st:=checkstack^.symtable;
if st.symtabletype in [staticsymtable,globalsymtable,localsymtable] then
break;
checkstack:=checkstack^.next;
end;
{ Create a nested procedure, even from main_program_level.
Furthermore, force procdef and procsym into the same symtable
(by default, defs are registered with symtablestack.top which may be
something temporary like exceptsymtable - in that case, procdef can be
destroyed before procsym, leaving invalid pointers). }
oldsymtablestack:=symtablestack;
symtablestack:=nil;
result:=cprocdef.create(max(normal_function_level,st.symtablelevel)+1,true);
result.returndef:=resultdef;
{ if the parent is a generic or a specialization, the new function is one
as well }
if st.symtabletype=localsymtable then
result.defoptions:=result.defoptions+(tstoreddef(st.defowner).defoptions*[df_generic,df_specialization]);
symtablestack:=oldsymtablestack;
st.insertdef(result);
result.struct:=astruct;
{ tabstractprocdef constructor sets po_delphi_nested_cc whenever
nested procvars modeswitch is active. We must be independent of this switch. }
exclude(result.procoptions,po_delphi_nested_cc);
result.proctypeoption:=potype;
{ always use the default calling convention }
result.proccalloption:=pocall_default;
include(result.procoptions,po_hascallingconvention);
handle_calling_convention(result,hcc_default_actions_impl);
sym:=cprocsym.create(basesymname+result.unique_id_str);
st.insert(sym);
result.procsym:=sym;
proc_add_definition(result);
{ the code will be assigned directly to the "code" field later }
result.forwarddef:=false;
result.aliasnames.insert(result.mangledname);
end;
end.
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