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{
Copyright (c) 1998-2002 by Florian Klaempfl
Reads typed constants
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 ptconst;
{$i fpcdefs.inc}
interface
uses symtype,symsym,aasmdata;
procedure read_typed_const(list:tasmlist;sym:tstaticvarsym;in_structure:boolean);
implementation
uses
globtype,systems,globals,verbose,cutils,tokens,
aasmbase,aasmtai,
procinfo,fmodule,
scanner,pbase,pdecvar,
node,nbas,ngtcon,
symconst,symbase,symdef
;
procedure read_typed_const(list:tasmlist;sym:tstaticvarsym;in_structure:boolean);
var
storefilepos : tfileposinfo;
cursectype : TAsmSectionType;
section : ansistring;
tcbuilder : ttypedconstbuilder;
datalist,
reslist : tasmlist;
restree,
previnit : tnode;
begin
{ mark the staticvarsym as typedconst }
include(sym.varoptions,vo_is_typed_const);
{ The variable has a value assigned }
sym.varstate:=vs_initialised;
{ the variable can't be placed in a register }
sym.varregable:=vr_none;
{ generate data for typed const }
storefilepos:=current_filepos;
current_filepos:=sym.fileinfo;
if not(target_info.system in systems_typed_constants_node_init) then
begin
maybe_new_object_file(list);
tcbuilder:=tasmlisttypedconstbuilderclass(ctypedconstbuilder).create(sym);
tasmlisttypedconstbuilder(tcbuilder).parse_into_asmlist(reslist,datalist);
{ Certain types like windows WideString are initialized at runtime and cannot
be placed into readonly memory }
if (sym.varspez=vs_const) and not (vo_force_finalize in sym.varoptions) then
cursectype:=sec_rodata
else
cursectype:=sec_data;
tcbuilder.free;
end
else
begin
if assigned(current_structdef) then
previnit:=current_structdef.tcinitcode
else
previnit:=tnode(current_module.tcinitcode);
tcbuilder:=tnodetreetypedconstbuilderclass(ctypedconstbuilder).create(sym,previnit);
restree:=tnodetreetypedconstbuilder(tcbuilder).parse_into_nodetree;
if assigned(current_structdef) then
current_structdef.tcinitcode:=restree
else
current_module.tcinitcode:=restree;
tcbuilder.free;
reslist:=nil;
datalist:=nil;
cursectype:=sec_none;
end;
{ Parse hints }
try_consume_hintdirective(sym.symoptions,sym.deprecatedmsg);
consume(_SEMICOLON);
{ parse public/external/export/... }
if not in_structure and
(
(
(token = _ID) and
(idtoken in [_EXPORT,_EXTERNAL,_WEAKEXTERNAL,_PUBLIC,_CVAR]) and
(m_cvar_support in current_settings.modeswitches)
) or
(
(m_mac in current_settings.modeswitches) and
(
(cs_external_var in current_settings.localswitches) or
(cs_externally_visible in current_settings.localswitches)
)
)
) then
read_public_and_external(sym);
{ try to parse a section directive }
if not in_structure and (target_info.system in systems_allow_section) and
(symtablestack.top.symtabletype in [staticsymtable,globalsymtable]) and
(idtoken=_SECTION) then
begin
try_consume_sectiondirective(section);
if section<>'' then
begin
if (sym.varoptions *[vo_is_external,vo_is_weak_external])<>[] then
Message(parser_e_externals_no_section);
if sym.typ<>staticvarsym then
Message(parser_e_section_no_locals);
tstaticvarsym(sym).section:=section;
include(sym.varoptions, vo_has_section);
end;
end;
if not(target_info.system in systems_typed_constants_node_init) then
begin
{ only now add items based on the symbolname, because it may }
{ have been modified by the directives parsed above }
if vo_has_section in sym.varoptions then
new_section(list,sec_user,sym.section,const_align(sym.vardef.alignment))
else
new_section(list,cursectype,lower(sym.mangledname),const_align(sym.vardef.alignment));
if sym.globalasmsym then
begin
{ see same code in ncgutil.insertbssdata }
if (target_dbg.id=dbg_stabx) and
(cs_debuginfo in current_settings.moduleswitches) and
not assigned(current_asmdata.GetAsmSymbol(sym.name)) then
begin
list.concat(tai_symbol.Create(current_asmdata.DefineAsmSymbol(sym.name,AB_LOCAL,AT_DATA),0));
list.concat(tai_directive.Create(asd_reference,sym.name));
end;
list.concat(Tai_symbol.Createname_global(sym.mangledname,AT_DATA,0))
end
else
list.concat(Tai_symbol.Createname(sym.mangledname,AT_DATA,0));
{ add the parsed value }
list.concatlist(reslist);
reslist.free;
list.concat(tai_symbol_end.Createname(sym.mangledname));
{ and pointed data, if any }
current_asmdata.asmlists[al_const].concatlist(datalist);
datalist.free;
end
else
begin
{ nothing to do }
end;
current_filepos:=storefilepos;
end;
end.
|
