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fpc/compiler/pdecvar.pas

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
Parses variable declarations. Used for var statement and record
definitions
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 pdecvar;
{$i fpcdefs.inc}
interface
procedure read_var_decs(is_record,is_object,is_threadvar:boolean);
implementation
uses
{ common }
cutils,cclasses,
{ global }
globtype,globals,tokens,verbose,
systems,
{ symtable }
symconst,symbase,symtype,symdef,symsym,symtable,defutil,
fmodule,
{ pass 1 }
node,
nmat,nadd,ncal,nset,ncnv,ninl,ncon,nld,nflw,
{ codegen }
ncgutil,
{ parser }
scanner,
pbase,pexpr,ptype,ptconst,pdecsub,
{ link }
import
{$ifdef Delphi}
,dmisc
,sysutils
{$endif}
;
const
variantrecordlevel : longint = 0;
procedure read_var_decs(is_record,is_object,is_threadvar:boolean);
{ reads the filed of a record into a }
{ symtablestack, if record=false }
{ variants are forbidden, so this procedure }
{ can be used to read object fields }
{ if absolute is true, ABSOLUTE and file }
{ types are allowed }
{ => the procedure is also used to read }
{ a sequence of variable declaration }
procedure insert_syms(sc : tsinglelist;tt : ttype;is_threadvar : boolean; addsymopts : tsymoptions);
{ inserts the symbols of sc in st with def as definition or sym as ttypesym, sc is disposed }
var
vs,vs2 : tvarsym;
begin
vs:=tvarsym(sc.first);
while assigned(vs) do
begin
vs.vartype:=tt;
{ insert any additional hint directives }
vs.symoptions := vs.symoptions + addsymopts;
if (sp_static in current_object_option) then
include(vs.symoptions,sp_static);
if is_threadvar then
include(vs.varoptions,vo_is_thread_var);
{ static data fields are inserted in the globalsymtable }
if (symtablestack.symtabletype=objectsymtable) and
(sp_static in current_object_option) then
begin
vs2:=tvarsym.create('$'+lower(symtablestack.name^)+'_'+vs.name,vs_value,tt);
symtablestack.defowner.owner.insert(vs2);
insertbssdata(vs2);
end
else
begin
{ external data is not possible here }
case symtablestack.symtabletype of
globalsymtable,
staticsymtable :
insertbssdata(vs);
recordsymtable,
objectsymtable :
tabstractrecordsymtable(symtablestack).insertfield(vs,false);
end;
end;
vs:=tvarsym(vs.listnext);
end;
end;
var
sc : tsinglelist;
old_block_type : tblock_type;
symdone : boolean;
{ to handle absolute }
abssym : tabsolutesym;
{ c var }
newtype : ttypesym;
is_dll,
is_gpc_name,is_cdecl,
extern_var,export_var : boolean;
old_current_object_option : tsymoptions;
hs,sorg,C_name,dll_name : string;
tt,casetype : ttype;
{ Delphi initialized vars }
tconstsym : ttypedconstsym;
{ maxsize contains the max. size of a variant }
{ startvarrec contains the start of the variant part of a record }
maxsize, startvarrecsize : longint;
usedalign,
minalignment,maxalignment,startvarrecalign : byte;
pt : tnode;
vs,vs2 : tvarsym;
srsym : tsym;
oldsymtablestack,
srsymtable : tsymtable;
unionsymtable : trecordsymtable;
offset : longint;
uniondef : trecorddef;
unionsym : tvarsym;
uniontype : ttype;
dummysymoptions : tsymoptions;
begin
old_current_object_option:=current_object_option;
{ all variables are public if not in a object declaration }
if not is_object then
current_object_option:=[sp_public];
old_block_type:=block_type;
block_type:=bt_type;
is_gpc_name:=false;
{ Force an expected ID error message }
if not (token in [_ID,_CASE,_END]) then
consume(_ID);
{ read vars }
sc:=tsinglelist.create;
while (token=_ID) and
not(is_object and (idtoken in [_PUBLIC,_PRIVATE,_PUBLISHED,_PROTECTED])) do
begin
sorg:=orgpattern;
sc.reset;
repeat
vs:=tvarsym.create(orgpattern,vs_value,generrortype);
symtablestack.insert(vs);
if assigned(vs.owner) then
sc.insert(vs)
else
vs.free;
consume(_ID);
until not try_to_consume(_COMMA);
consume(_COLON);
if (m_gpc in aktmodeswitches) and
not(is_record or is_object or is_threadvar) and
(token=_ID) and (orgpattern='__asmname__') then
begin
consume(_ID);
C_name:=get_stringconst;
Is_gpc_name:=true;
end;
{ this is needed for Delphi mode at least
but should be OK for all modes !! (PM) }
ignore_equal:=true;
if is_record or is_object then
begin
{ for records, don't search the recordsymtable for
the symbols of the types }
oldsymtablestack:=symtablestack;
symtablestack:=symtablestack.next;
read_type(tt,'',true);
symtablestack:=oldsymtablestack;
end
else
read_type(tt,'',true);
{ types that use init/final are not allowed in variant parts, but
classes are allowed }
if (variantrecordlevel>0) and
(tt.def.needs_inittable and not is_class(tt.def)) then
Message(parser_e_cant_use_inittable_here);
ignore_equal:=false;
symdone:=false;
if is_gpc_name then
begin
vs:=tvarsym(sc.first);
if assigned(vs.listnext) then
Message(parser_e_absolute_only_one_var);
vs.vartype:=tt;
include(vs.varoptions,vo_is_C_var);
vs.set_mangledname(target_info.Cprefix+sorg);
include(vs.varoptions,vo_is_external);
symdone:=true;
end;
{ check for absolute }
if not symdone and
(idtoken=_ABSOLUTE) and not(is_record or is_object or is_threadvar) then
begin
consume(_ABSOLUTE);
abssym:=nil;
{ only allowed for one var }
vs:=tvarsym(sc.first);
if assigned(vs.listnext) then
Message(parser_e_absolute_only_one_var);
{ parse the rest }
pt:=expr;
{ transform a procvar calln to loadn }
if pt.nodetype=calln then
load_procvar_from_calln(pt);
{ check allowed absolute types }
if (pt.nodetype=stringconstn) or
(is_constcharnode(pt)) then
begin
abssym:=tabsolutesym.create(vs.realname,tt);
abssym.fileinfo:=vs.fileinfo;
if pt.nodetype=stringconstn then
hs:=strpas(tstringconstnode(pt).value_str)
else
hs:=chr(tordconstnode(pt).value);
consume(token);
abssym.abstyp:=toasm;
abssym.asmname:=stringdup(hs);
{ replace the varsym }
symtablestack.replace(vs,abssym);
vs.free;
end
{ variable }
else if (pt.nodetype=loadn) then
begin
{ we should check the result type of srsym }
if not (tloadnode(pt).symtableentry.typ in [varsym,typedconstsym]) then
Message(parser_e_absolute_only_to_var_or_const);
abssym:=tabsolutesym.create(vs.realname,tt);
abssym.fileinfo:=vs.fileinfo;
abssym.abstyp:=tovar;
abssym.ref:=tstoredsym(tloadnode(pt).symtableentry);
symtablestack.replace(vs,abssym);
vs.free;
{ the variable cannot be put into a register
if the size definition is not the same.
}
if tloadnode(pt).symtableentry.typ = varsym then
begin
if abssym.vartype.def <>
tvarsym(tloadnode(pt).symtableentry).vartype.def then
tvarsym(tloadnode(pt).symtableentry).varoptions:=
tvarsym(tloadnode(pt).symtableentry).varoptions-[vo_regable,vo_fpuregable]
end;
end
{ address }
else if is_constintnode(pt) and
((target_info.system in [system_i386_go32v2,system_i386_watcom,
system_i386_wdosx,system_i386_win32]) or
(m_objfpc in aktmodeswitches) or
(m_delphi in aktmodeswitches)) then
begin
abssym:=tabsolutesym.create(vs.realname,tt);
abssym.fileinfo:=vs.fileinfo;
abssym.abstyp:=toaddr;
abssym.absseg:=false;
abssym.fieldoffset:=tordconstnode(pt).value;
if (target_info.system in [system_i386_go32v2,system_i386_watcom]) and
try_to_consume(_COLON) then
begin
pt.free;
pt:=expr;
if is_constintnode(pt) then
begin
abssym.fieldoffset:=abssym.fieldoffset shl 4+tordconstnode(pt).value;
abssym.absseg:=true;
end
else
Message(type_e_ordinal_expr_expected);
end;
symtablestack.replace(vs,abssym);
vs.free;
end
else
Message(parser_e_absolute_only_to_var_or_const);
if assigned(abssym) then
begin
{ try to consume the hint directives with absolute symbols }
dummysymoptions:=[];
try_consume_hintdirective(dummysymoptions);
abssym.symoptions := abssym.symoptions + dummysymoptions;
end;
pt.free;
symdone:=true;
end;
{ Records and objects can't have default values }
if is_record or is_object then
begin
{ try to parse the hint directives }
dummysymoptions:=[];
try_consume_hintdirective(dummysymoptions);
{ for a record there doesn't need to be a ; before the END or ) }
if not(token in [_END,_RKLAMMER]) then
consume(_SEMICOLON);
end
else
begin
{ Process procvar directives before = and ; }
if (tt.def.deftype=procvardef) and
(tt.def.typesym=nil) and
is_proc_directive(token,true) then
begin
newtype:=ttypesym.create('unnamed',tt);
parse_var_proc_directives(tsym(newtype));
newtype.restype.def:=nil;
tt.def.typesym:=nil;
newtype.free;
end;
{ try to parse the hint directives }
dummysymoptions:=[];
try_consume_hintdirective(dummysymoptions);
{ Handling of Delphi typed const = initialized vars ! }
{ When should this be rejected ?
- in parasymtable
- in record or object
- ... (PM) }
if (token=_EQUAL) and
not(m_tp7 in aktmodeswitches) and
not(symtablestack.symtabletype in [parasymtable]) and
not is_record and
not is_object then
begin
vs:=tvarsym(sc.first);
if assigned(vs.listnext) then
Message(parser_e_initialized_only_one_var);
if is_threadvar then
Message(parser_e_initialized_not_for_threadvar);
if symtablestack.symtabletype=localsymtable then
begin
consume(_EQUAL);
tconstsym:=ttypedconstsym.createtype('default'+vs.realname,tt,false);
vs.defaultconstsym:=tconstsym;
symtablestack.insert(tconstsym);
insertconstdata(tconstsym);
readtypedconst(tt,tconstsym,false);
end
else
begin
tconstsym:=ttypedconstsym.createtype(vs.realname,tt,true);
tconstsym.fileinfo:=vs.fileinfo;
symtablestack.replace(vs,tconstsym);
vs.free;
insertconstdata(tconstsym);
consume(_EQUAL);
readtypedconst(tt,tconstsym,true);
symdone:=true;
end;
consume(_SEMICOLON);
end
else
begin
consume(_SEMICOLON);
end;
end;
{ Parse procvar directives after ; }
if (tt.def.deftype=procvardef) and
(tt.def.typesym=nil) then
begin
if is_proc_directive(token,true) then
begin
newtype:=ttypesym.create('unnamed',tt);
parse_var_proc_directives(tsym(newtype));
newtype.restype.def:=nil;
tt.def.typesym:=nil;
newtype.free;
end;
{ Add calling convention for procvar }
handle_calling_convention(tprocvardef(tt.def));
end;
{ Check for variable directives }
if not symdone and (token=_ID) then
begin
{ Check for C Variable declarations }
if (m_cvar_support in aktmodeswitches) and
not(is_record or is_object or is_threadvar) and
(idtoken in [_EXPORT,_EXTERNAL,_PUBLIC,_CVAR]) then
begin
{ only allowed for one var }
vs:=tvarsym(sc.first);
if assigned(vs.listnext) then
Message(parser_e_absolute_only_one_var);
{ set type of the var }
vs.vartype:=tt;
vs.symoptions := vs.symoptions + dummysymoptions;
{ defaults }
is_dll:=false;
is_cdecl:=false;
extern_var:=false;
export_var:=false;
C_name:=sorg;
{ cdecl }
if idtoken=_CVAR then
begin
consume(_CVAR);
consume(_SEMICOLON);
is_cdecl:=true;
C_name:=target_info.Cprefix+sorg;
end;
{ external }
if idtoken=_EXTERNAL then
begin
consume(_EXTERNAL);
extern_var:=true;
end;
{ export }
if idtoken in [_EXPORT,_PUBLIC] then
begin
consume(_ID);
if extern_var or
(symtablestack.symtabletype in [parasymtable,localsymtable]) then
Message(parser_e_not_external_and_export)
else
export_var:=true;
end;
{ external and export need a name after when no cdecl is used }
if not is_cdecl then
begin
{ dll name ? }
if (extern_var) and (idtoken<>_NAME) then
begin
is_dll:=true;
dll_name:=get_stringconst;
end;
consume(_NAME);
C_name:=get_stringconst;
end;
{ consume the ; when export or external is used }
if extern_var or export_var then
consume(_SEMICOLON);
{ set some vars options }
if is_dll then
include(vs.varoptions,vo_is_dll_var)
else
include(vs.varoptions,vo_is_C_var);
vs.set_mangledname(C_Name);
if export_var then
begin
inc(vs.refs);
include(vs.varoptions,vo_is_exported);
end;
if extern_var then
include(vs.varoptions,vo_is_external);
{ insert in the datasegment when it is not external }
if (not extern_var) then
insertbssdata(vs);
{ now we can insert it in the import lib if its a dll, or
add it to the externals }
if extern_var then
begin
if is_dll then
begin
if not(current_module.uses_imports) then
begin
current_module.uses_imports:=true;
importlib.preparelib(current_module.modulename^);
end;
importlib.importvariable(vs,C_name,dll_name);
end
else
if target_info.DllScanSupported then
current_module.Externals.insert(tExternalsItem.create(vs.mangledname));
end;
symdone:=true;
end
else
if (is_object) and (cs_static_keyword in aktmoduleswitches) and (idtoken=_STATIC) then
begin
include(current_object_option,sp_static);
insert_syms(sc,tt,false,dummysymoptions);
exclude(current_object_option,sp_static);
consume(_STATIC);
consume(_SEMICOLON);
symdone:=true;
end;
end;
{ insert it in the symtable, if not done yet }
if not symdone then
begin
{ save object option, because we can turn of the sp_published }
if (sp_published in current_object_option) and
not(is_class(tt.def)) then
begin
Message(parser_e_cant_publish_that);
exclude(current_object_option,sp_published);
{ recover by changing access type to public }
vs2:=tvarsym(sc.first);
while assigned (vs2) do
begin
exclude(vs2.symoptions,sp_published);
include(vs2.symoptions,sp_public);
vs2:=tvarsym(vs2.listnext);
end;
end
else
if (sp_published in current_object_option) and
not(oo_can_have_published in tobjectdef(tt.def).objectoptions) then
begin
Message(parser_e_only_publishable_classes_can__be_published);
exclude(current_object_option,sp_published);
end;
insert_syms(sc,tt,is_threadvar,dummysymoptions);
current_object_option:=old_current_object_option;
end;
end;
{ Check for Case }
if is_record and (token=_CASE) then
begin
maxsize:=0;
maxalignment:=0;
consume(_CASE);
sorg:=orgpattern;
hs:=pattern;
searchsym(hs,srsym,srsymtable);
{ may be only a type: }
if assigned(srsym) and (srsym.typ in [typesym,unitsym]) then
begin
{ for records, don't search the recordsymtable for
the symbols of the types }
oldsymtablestack:=symtablestack;
symtablestack:=symtablestack.next;
read_type(casetype,'',true);
symtablestack:=oldsymtablestack;
end
else
begin
consume(_ID);
consume(_COLON);
{ for records, don't search the recordsymtable for
the symbols of the types }
oldsymtablestack:=symtablestack;
symtablestack:=symtablestack.next;
read_type(casetype,'',true);
symtablestack:=oldsymtablestack;
vs:=tvarsym.create(sorg,vs_value,casetype);
tabstractrecordsymtable(symtablestack).insertfield(vs,true);
end;
if not(is_ordinal(casetype.def)) or is_64bitint(casetype.def) then
Message(type_e_ordinal_expr_expected);
consume(_OF);
UnionSymtable:=trecordsymtable.create;
Unionsymtable.next:=symtablestack;
registerdef:=false;
UnionDef:=trecorddef.create(unionsymtable);
uniondef.isunion:=true;
if assigned(symtablestack.defowner) then
Uniondef.owner:=symtablestack.defowner.owner;
registerdef:=true;
startvarrecsize:=UnionSymtable.datasize;
startvarrecalign:=UnionSymtable.dataalignment;
symtablestack:=UnionSymtable;
repeat
repeat
pt:=comp_expr(true);
if not(pt.nodetype=ordconstn) then
Message(cg_e_illegal_expression);
pt.free;
if token=_COMMA then
consume(_COMMA)
else
break;
until false;
consume(_COLON);
{ read the vars }
consume(_LKLAMMER);
inc(variantrecordlevel);
if token<>_RKLAMMER then
read_var_decs(true,false,false);
dec(variantrecordlevel);
consume(_RKLAMMER);
{ calculates maximal variant size }
maxsize:=max(maxsize,unionsymtable.datasize);
maxalignment:=max(maxalignment,unionsymtable.dataalignment);
{ the items of the next variant are overlayed }
unionsymtable.datasize:=startvarrecsize;
unionsymtable.dataalignment:=startvarrecalign;
if (token<>_END) and (token<>_RKLAMMER) then
consume(_SEMICOLON)
else
break;
until (token=_END) or (token=_RKLAMMER);
{ at last set the record size to that of the biggest variant }
unionsymtable.datasize:=maxsize;
unionsymtable.dataalignment:=maxalignment;
uniontype.def:=uniondef;
uniontype.sym:=nil;
UnionSym:=tvarsym.create('$case',vs_value,uniontype);
symtablestack:=symtablestack.next;
{ we do NOT call symtablestack.insert
on purpose PM }
if aktalignment.recordalignmax=-1 then
begin
{$ifdef i386}
if maxalignment>2 then
minalignment:=4
else if maxalignment>1 then
minalignment:=2
else
minalignment:=1;
{$else}
{$ifdef m68k}
minalignment:=2;
{$endif}
minalignment:=1;
{$endif}
end
else
minalignment:=maxalignment;
usedalign:=used_align(maxalignment,minalignment,maxalignment);
offset:=align(trecordsymtable(symtablestack).datasize,usedalign);
trecordsymtable(symtablestack).datasize:=offset+unionsymtable.datasize;
if maxalignment>trecordsymtable(symtablestack).dataalignment then
trecordsymtable(symtablestack).dataalignment:=maxalignment;
Unionsymtable.Insert_in(trecordsymtable(symtablestack),offset);
Unionsym.owner:=nil;
unionsym.free;
uniondef.owner:=nil;
uniondef.free;
end;
block_type:=old_block_type;
current_object_option:=old_current_object_option;
{ free the list }
sc.free;
end;
end.
{
$Log$
Revision 1.56 2003-10-05 12:55:37 peter
* allow absolute with value for win32,wdos
Revision 1.55 2003/10/03 14:45:09 peter
* more proc directive for procvar fixes
Revision 1.54 2003/10/02 21:13:09 peter
* procvar directive parsing fixes
Revision 1.53 2003/10/02 15:12:07 peter
* fix type parsing in records
Revision 1.52 2003/10/01 19:05:33 peter
* searchsym_type to search for type definitions. It ignores
records,objects and parameters
Revision 1.51 2003/09/23 17:56:05 peter
* locals and paras are allocated in the code generation
* tvarsym.localloc contains the location of para/local when
generating code for the current procedure
Revision 1.50 2003/09/07 14:14:51 florian
* proper error recovering from invalid published fields
Revision 1.49 2003/09/05 17:41:12 florian
* merged Wiktor's Watcom patches in 1.1
Revision 1.48 2003/07/02 22:18:04 peter
* paraloc splitted in callerparaloc,calleeparaloc
* sparc calling convention updates
Revision 1.47 2003/05/09 17:47:03 peter
* self moved to hidden parameter
* removed hdisposen,hnewn,selfn
Revision 1.46 2003/04/25 20:59:33 peter
* removed funcretn,funcretsym, function result is now in varsym
and aliases for result and function name are added using absolutesym
* vs_hidden parameter for funcret passed in parameter
* vs_hidden fixes
* writenode changed to printnode and released from extdebug
* -vp option added to generate a tree.log with the nodetree
* nicer printnode for statements, callnode
Revision 1.45 2003/03/17 18:56:02 peter
* fix crash with duplicate id
Revision 1.44 2003/01/02 11:14:02 michael
+ Patch from peter to support initial values for local variables
Revision 1.43 2002/12/27 15:22:20 peter
* don't allow initialized threadvars
Revision 1.42 2002/12/07 14:04:59 carl
* convert some vars from longint -> byte
Revision 1.41 2002/11/29 22:31:19 carl
+ unimplemented hint directive added
* hint directive parsing implemented
* warning on these directives
Revision 1.40 2002/11/25 17:43:21 peter
* splitted defbase in defutil,symutil,defcmp
* merged isconvertable and is_equal into compare_defs(_ext)
* made operator search faster by walking the list only once
Revision 1.39 2002/11/15 16:29:31 peter
* made tasmsymbol.refs private (merged)
Revision 1.38 2002/11/15 01:58:53 peter
* merged changes from 1.0.7 up to 04-11
- -V option for generating bug report tracing
- more tracing for option parsing
- errors for cdecl and high()
- win32 import stabs
- win32 records<=8 are returned in eax:edx (turned off by default)
- heaptrc update
- more info for temp management in .s file with EXTDEBUG
Revision 1.37 2002/10/05 15:18:43 carl
* fix heap leaks
Revision 1.36 2002/10/05 12:43:26 carl
* fixes for Delphi 6 compilation
(warning : Some features do not work under Delphi)
Revision 1.35 2002/10/04 20:53:05 carl
* bugfix of crash
Revision 1.34 2002/10/03 21:22:01 carl
* don't make the vars regable if they are absolute and their definitions
are not the same.
Revision 1.33 2002/09/16 18:08:45 peter
* fix setting of sp_static
Revision 1.32 2002/09/09 17:34:15 peter
* tdicationary.replace added to replace and item in a dictionary. This
is only allowed for the same name
* varsyms are inserted in symtable before the types are parsed. This
fixes the long standing "var longint : longint" bug
- consume_idlist and idstringlist removed. The loops are inserted
at the callers place and uses the symtable for duplicate id checking
Revision 1.31 2002/08/25 19:25:20 peter
* sym.insert_in_data removed
* symtable.insertvardata/insertconstdata added
* removed insert_in_data call from symtable.insert, it needs to be
called separatly. This allows to deref the address calculation
* procedures now calculate the parast addresses after the procedure
directives are parsed. This fixes the cdecl parast problem
* push_addr_param has an extra argument that specifies if cdecl is used
or not
Revision 1.30 2002/07/29 21:23:44 florian
* more fixes for the ppc
+ wrappers for the tcnvnode.first_* stuff introduced
Revision 1.29 2002/07/26 21:15:40 florian
* rewrote the system handling
Revision 1.28 2002/07/20 11:57:55 florian
* types.pas renamed to defbase.pas because D6 contains a types
unit so this would conflicts if D6 programms are compiled
+ Willamette/SSE2 instructions to assembler added
Revision 1.27 2002/06/10 13:41:26 jonas
* fixed bug 1985
Revision 1.26 2002/05/18 13:34:12 peter
* readded missing revisions
Revision 1.25 2002/05/16 19:46:43 carl
+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
+ try to fix temp allocation (still in ifdef)
+ generic constructor calls
+ start of tassembler / tmodulebase class cleanup
Revision 1.23 2002/04/21 18:57:24 peter
* fixed memleaks when file can't be opened
}
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