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359f502adc
fpc/compiler/pexpr.pas
florian 68c1a1e3e6 * System.TypeInfo fixed 
+ System.Finalize implemented
  + some new keywords for interface support added
2000-11-09 17:46:54 +00:00

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93 KiB
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{
$Id$
Copyright (c) 1998-2000 by Florian Klaempfl
Does parsing of expression for Free Pascal
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 pexpr;
{$i defines.inc}
interface
uses
symtype,
node;
{ reads a whole expression }
function expr : tnode;
{ reads an expression without assignements and .. }
function comp_expr(accept_equal : boolean):tnode;
{ reads a single factor }
function factor(getaddr : boolean) : tnode;
function string_dec : pdef;
{ the ID token has to be consumed before calling this function }
procedure do_member_read(getaddr : boolean;const sym : psym;var p1 : tnode;
var pd : pdef;var again : boolean);
function get_intconst:longint;
function get_stringconst:string;
implementation
uses
{ common }
cutils,cobjects,
{ global }
globtype,globals,tokens,verbose,
systems,cpuinfo,
{ aasm }
aasm,
{ symtable }
symconst,symbase,symdef,symsym,symtable,types,
{$ifdef GDB}
gdb,
{$endif}
{ pass 1 }
pass_1,htypechk,
nmat,nadd,ncal,nmem,nset,ncnv,ninl,ncon,nld,nflw,nbas,
{ parser }
scanner,
pbase,
{ codegen }
{$ifdef newcg}
cgbase
{$else}
hcodegen
{$endif}
;
{ sub_expr(opmultiply) is need to get -1 ** 4 to be
read as - (1**4) and not (-1)**4 PM }
type
Toperator_precedence=(opcompare,opaddition,opmultiply,oppower);
const
highest_precedence = oppower;
function sub_expr(pred_level:Toperator_precedence;accept_equal : boolean):tnode;forward;
const
allow_type : boolean = true;
got_addrn : boolean = false;
auto_inherited : boolean = false;
function string_dec : pdef;
{ reads a string type with optional length }
{ and returns a pointer to the string }
{ definition }
var
p : tnode;
d : pdef;
begin
consume(_STRING);
if token=_LECKKLAMMER then
begin
consume(_LECKKLAMMER);
p:=comp_expr(true);
do_firstpass(p);
if not is_constintnode(p) then
begin
Message(cg_e_illegal_expression);
{ error recovery }
consume(_RECKKLAMMER);
d:=cshortstringdef;
end
else
begin
if (tordconstnode(p).value<=0) then
begin
Message(parser_e_invalid_string_size);
tordconstnode(p).value:=255;
end;
consume(_RECKKLAMMER);
if tordconstnode(p).value>255 then
d:=new(pstringdef,longinit(tordconstnode(p).value))
else
if tordconstnode(p).value<>255 then
d:=new(pstringdef,shortinit(tordconstnode(p).value))
else
d:=cshortstringdef;
end;
p.free;
end
else
begin
if cs_ansistrings in aktlocalswitches then
d:=cansistringdef
else
d:=cshortstringdef;
end;
string_dec:=d;
end;
function parse_paras(__colon,in_prop_paras : boolean) : tnode;
var
p1,p2 : tnode;
end_of_paras : ttoken;
begin
if in_prop_paras then
end_of_paras:=_RECKKLAMMER
else
end_of_paras:=_RKLAMMER;
if token=end_of_paras then
begin
parse_paras:=nil;
exit;
end;
p2:=nil;
inc(parsing_para_level);
while true do
begin
p1:=comp_expr(true);
p2:=gencallparanode(p1,p2);
{ it's for the str(l:5,s); }
if __colon and (token=_COLON) then
begin
consume(_COLON);
p1:=comp_expr(true);
p2:=gencallparanode(p1,p2);
include(tcallparanode(p2).callparaflags,cpf_is_colon_para);
if token=_COLON then
begin
consume(_COLON);
p1:=comp_expr(true);
p2:=gencallparanode(p1,p2);
include(tcallparanode(p2).callparaflags,cpf_is_colon_para);
end
end;
if token=_COMMA then
consume(_COMMA)
else
break;
end;
dec(parsing_para_level);
parse_paras:=p2;
end;
procedure check_tp_procvar(var p : tnode);
var
p1 : tnode;
begin
if (m_tp_procvar in aktmodeswitches) and
(not got_addrn) and
(not in_args) and
(p.nodetype=loadn) then
begin
{ support if procvar then for tp7 and many other expression like this }
do_firstpass(p);
set_varstate(p,false);
{ reset varstateset to maybe set used state later web bug769 PM }
unset_varstate(p);
if not(getprocvar) and (p.resulttype^.deftype=procvardef) then
begin
p1:=gencallnode(nil,nil);
tcallnode(p1).right:=p;
p1.resulttype:=pprocvardef(p.resulttype)^.rettype.def;
firstpass(p1);
p:=p1;
end;
end;
end;
function statement_syssym(l : longint;var pd : pdef) : tnode;
var
p1,p2,paras : tnode;
prev_in_args : boolean;
begin
prev_in_args:=in_args;
case l of
in_ord_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
consume(_RKLAMMER);
do_firstpass(p1);
p1:=geninlinenode(in_ord_x,false,p1);
do_firstpass(p1);
statement_syssym := p1;
pd:=p1.resulttype;
end;
in_break :
begin
statement_syssym:=cbreaknode.create;
pd:=voiddef;
end;
in_continue :
begin
statement_syssym:=ccontinuenode.create;
pd:=voiddef;
end;
in_typeof_x :
begin
consume(_LKLAMMER);
in_args:=true;
{allow_type:=true;}
p1:=comp_expr(true);
{allow_type:=false;}
consume(_RKLAMMER);
pd:=voidpointerdef;
if p1.nodetype=typen then
begin
if (ttypenode(p1).typenodetype=nil) then
begin
Message(type_e_mismatch);
statement_syssym:=cerrornode.create;
end
else
if ttypenode(p1).typenodetype^.deftype=objectdef then
begin
{ we can use resulttype in pass_2 (PM) }
p1.resulttype:=ttypenode(p1).typenodetype;
statement_syssym:=geninlinenode(in_typeof_x,false,p1);
end
else
begin
Message(type_e_mismatch);
p1.destroy;
statement_syssym:=cerrornode.create;
end;
end
else { not a type node }
begin
do_firstpass(p1);
set_varstate(p1,false);
if (p1.resulttype=nil) then
begin
Message(type_e_mismatch);
p1.destroy;
statement_syssym:=cerrornode.create;
end
else
if p1.resulttype^.deftype=objectdef then
statement_syssym:=geninlinenode(in_typeof_x,false,p1)
else
begin
Message(type_e_mismatch);
statement_syssym:=cerrornode.create;
p1.destroy;
end;
end;
end;
in_sizeof_x :
begin
consume(_LKLAMMER);
in_args:=true;
{allow_type:=true;}
p1:=comp_expr(true);
{allow_type:=false; }
consume(_RKLAMMER);
pd:=s32bitdef;
if p1.nodetype=typen then
begin
statement_syssym:=genordinalconstnode(ttypenode(p1).typenodetype^.size,pd);
{ p1 not needed !}
p1.destroy;
end
else
begin
do_firstpass(p1);
if ((p1.resulttype^.deftype=objectdef) and
(oo_has_constructor in pobjectdef(p1.resulttype)^.objectoptions)) or
is_open_array(p1.resulttype) or
is_open_string(p1.resulttype) then
statement_syssym:=geninlinenode(in_sizeof_x,false,p1)
else
begin
statement_syssym:=genordinalconstnode(p1.resulttype^.size,pd);
{ p1 not needed !}
p1.destroy;
end;
end;
end;
in_typeinfo_x :
begin
consume(_LKLAMMER);
in_args:=true;
{allow_type:=true;}
p1:=comp_expr(true);
do_firstpass(p1);
{allow_type:=false; }
if p1.nodetype<>typen then
begin
p1.destroy;
p1:=cerrornode.create;
Message(parser_e_illegal_parameter_list);
end;
consume(_RKLAMMER);
p2:=gencallparanode(p1,nil);
p2:=geninlinenode(in_typeinfo_x,false,p2);
pd:=voidpointerdef;
statement_syssym:=p2;
end;
in_assigned_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
do_firstpass(p1);
if not codegenerror then
begin
case p1.resulttype^.deftype of
pointerdef,
procvardef,
classrefdef : ;
objectdef :
if not is_class_or_interface(p1.resulttype) then
Message(parser_e_illegal_parameter_list);
else
Message(parser_e_illegal_parameter_list);
end;
end;
p2:=gencallparanode(p1,nil);
p2:=geninlinenode(in_assigned_x,false,p2);
consume(_RKLAMMER);
pd:=booldef;
statement_syssym:=p2;
end;
in_addr_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p1:=caddrnode.create(p1);
do_firstpass(p1);
pd:=p1.resulttype;
consume(_RKLAMMER);
statement_syssym:=p1;
end;
in_ofs_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p1:=caddrnode.create(p1);
do_firstpass(p1);
{ Ofs() returns a longint, not a pointer }
p1.resulttype:=u32bitdef;
pd:=p1.resulttype;
consume(_RKLAMMER);
statement_syssym:=p1;
end;
in_seg_x :
begin
consume(_LKLAMMER);
in_args:=true;
{ the expression must be allowed to be assigned to }
p1:=comp_expr(true);
p1:=geninlinenode(in_assigned_x,false,p1);
do_firstpass(p1);
consume(_RKLAMMER);
statement_syssym:=p1;
end;
in_high_x,
in_low_x :
begin
consume(_LKLAMMER);
in_args:=true;
{allow_type:=true;}
p1:=comp_expr(true);
{allow_type:=false;}
do_firstpass(p1);
if p1.nodetype=typen then
p1.resulttype:=ttypenode(p1).typenodetype;
p2:=geninlinenode(l,false,p1);
consume(_RKLAMMER);
pd:=s32bitdef;
statement_syssym:=p2;
end;
in_succ_x,
in_pred_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
do_firstpass(p1);
p2:=geninlinenode(l,false,p1);
consume(_RKLAMMER);
pd:=p1.resulttype;
statement_syssym:=p2;
end;
in_inc_x,
in_dec_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
if token=_COMMA then
begin
consume(_COMMA);
p2:=gencallparanode(comp_expr(true),nil);
end
else
p2:=nil;
p2:=gencallparanode(p1,p2);
statement_syssym:=geninlinenode(l,false,p2);
consume(_RKLAMMER);
pd:=voiddef;
end;
in_finalize_x:
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
if token=_COMMA then
begin
consume(_COMMA);
p2:=gencallparanode(comp_expr(true),nil);
end
else
p2:=nil;
p2:=gencallparanode(p1,p2);
statement_syssym:=geninlinenode(in_finalize_x,false,p2);
consume(_RKLAMMER);
pd:=voiddef;
end;
in_concat_x :
begin
consume(_LKLAMMER);
in_args:=true;
p2:=nil;
while true do
begin
p1:=comp_expr(true);
do_firstpass(p1);
set_varstate(p1,true);
if not((p1.resulttype^.deftype=stringdef) or
((p1.resulttype^.deftype=orddef) and
(porddef(p1.resulttype)^.typ=uchar))) then
Message(parser_e_illegal_parameter_list);
if p2<>nil then
p2:=caddnode.create(addn,p2,p1)
else
p2:=p1;
if token=_COMMA then
consume(_COMMA)
else
break;
end;
consume(_RKLAMMER);
pd:=cshortstringdef;
statement_syssym:=p2;
end;
in_read_x,
in_readln_x :
begin
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
in_args:=true;
paras:=parse_paras(false,false);
consume(_RKLAMMER);
end
else
paras:=nil;
pd:=voiddef;
p1:=geninlinenode(l,false,paras);
do_firstpass(p1);
statement_syssym := p1;
end;
in_setlength_x:
begin
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
in_args:=true;
paras:=parse_paras(false,false);
consume(_RKLAMMER);
end
else
paras:=nil;
pd:=voiddef;
p1:=geninlinenode(l,false,paras);
do_firstpass(p1);
statement_syssym := p1;
end;
in_write_x,
in_writeln_x :
begin
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
in_args:=true;
paras:=parse_paras(true,false);
consume(_RKLAMMER);
end
else
paras:=nil;
pd:=voiddef;
p1 := geninlinenode(l,false,paras);
do_firstpass(p1);
statement_syssym := p1;
end;
in_str_x_string :
begin
consume(_LKLAMMER);
in_args:=true;
paras:=parse_paras(true,false);
consume(_RKLAMMER);
p1 := geninlinenode(l,false,paras);
do_firstpass(p1);
statement_syssym := p1;
pd:=voiddef;
end;
in_val_x:
Begin
consume(_LKLAMMER);
in_args := true;
p1:= gencallparanode(comp_expr(true), nil);
consume(_COMMA);
p2 := gencallparanode(comp_expr(true),p1);
if (token = _COMMA) then
Begin
consume(_COMMA);
p2 := gencallparanode(comp_expr(true),p2)
End;
consume(_RKLAMMER);
p2 := geninlinenode(l,false,p2);
do_firstpass(p2);
statement_syssym := p2;
pd := voiddef;
End;
in_include_x_y,
in_exclude_x_y :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
consume(_COMMA);
p2:=comp_expr(true);
statement_syssym:=geninlinenode(l,false,gencallparanode(p1,gencallparanode(p2,nil)));
consume(_RKLAMMER);
pd:=voiddef;
end;
in_assert_x_y :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
if token=_COMMA then
begin
consume(_COMMA);
p2:=comp_expr(true);
end
else
begin
{ then insert an empty string }
p2:=genstringconstnode('',st_default);
end;
statement_syssym:=geninlinenode(l,false,gencallparanode(p1,gencallparanode(p2,nil)));
consume(_RKLAMMER);
pd:=voiddef;
end;
else
internalerror(15);
end;
in_args:=prev_in_args;
end;
{ reads the parameter for a subroutine call }
procedure do_proc_call(getaddr : boolean;var again : boolean;var p1:tcallnode;var pd:Pdef);
var
prev_in_args : boolean;
prevafterassn : boolean;
hs,hs1 : pvarsym;
st : psymtable;
p2 : tnode;
begin
prev_in_args:=in_args;
prevafterassn:=afterassignment;
afterassignment:=false;
{ want we only determine the address of }
{ a subroutine ? }
if not(getaddr) then
begin
if auto_inherited then
begin
st:=symtablestack;
while assigned(st) and (st^.symtabletype<>parasymtable) do
st:=st^.next;
p2:=nil;
if assigned(st) then
begin
hs:=pvarsym(st^.symindex^.first);
while assigned(hs) do
begin
if hs^.typ<>varsym then
internalerror(54382953);
{ if there is a localcopy then use that }
if assigned(hs^.localvarsym) then
hs1:=hs^.localvarsym
else
hs1:=hs;
p2:=gencallparanode(genloadnode(hs1,hs1^.owner),p2);
hs:=pvarsym(hs^.indexnext);
end;
end
else
internalerror(54382954);
p1.left:=p2;
end
else
begin
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
in_args:=true;
p1.left:=parse_paras(false,false);
consume(_RKLAMMER);
end
else
p1.left:=nil;
end;
{ do firstpass because we need the }
{ result type }
do_firstpass(p1);
{set_var_state is handled inside firstcalln }
end
else
begin
{ address operator @: }
p1.left:=nil;
{ forget pd }
pd:=nil;
if (p1.symtableproc^.symtabletype=withsymtable) and
(p1.symtableproc^.defowner^.deftype=objectdef) then
begin
p1.methodpointer:=tnode(pwithsymtable(p1.symtableproc)^.withrefnode).getcopy;
end
else if not(assigned(p1.methodpointer)) then
begin
{ we must provide a method pointer, if it isn't given, }
{ it is self }
if assigned(procinfo) then
begin
p1.methodpointer:=genselfnode(procinfo^._class);
p1.methodpointer.resulttype:=procinfo^._class;
end
else
begin
p1.methodpointer:=genselfnode(nil);
p1.methodpointer.resulttype:=nil;
end;
end;
{ no postfix operators }
again:=false;
end;
pd:=p1.resulttype;
in_args:=prev_in_args;
afterassignment:=prevafterassn;
end;
procedure handle_procvar(pv : pprocvardef;var p2 : tnode);
procedure doconv(procvar : pprocvardef;var t : tnode);
var
hp : tnode;
begin
hp:=nil;
if (proc_to_procvar_equal(pprocsym(tcallnode(t).symtableprocentry)^.definition,procvar)) then
begin
if (po_methodpointer in procvar^.procoptions) then
hp:=genloadmethodcallnode(pprocsym(tcallnode(t).symtableprocentry),tcallnode(t).symtableproc,tnode(tcallnode(t).methodpointer).getcopy)
else
hp:=genloadcallnode(pprocsym(tcallnode(t).symtableprocentry),tcallnode(t).symtableproc);
end;
if assigned(hp) then
begin
t.destroy;
t:=hp;
end;
end;
begin
if (p2.nodetype=calln) then
doconv(pv,tcallnode(p2))
else
if (p2.nodetype=typeconvn) and
(ttypeconvnode(p2).left.nodetype=calln) then
doconv(pv,tcallnode(ttypeconvnode(p2).left));
end;
{ the following procedure handles the access to a property symbol }
procedure handle_propertysym(sym : psym;st : psymtable;var p1 : tnode;
var pd : pdef);
var
paras : tnode;
p2 : tnode;
plist : psymlistitem;
begin
paras:=nil;
{ property parameters? read them only if the property really }
{ has parameters }
if ppo_hasparameters in ppropertysym(sym)^.propoptions then
begin
if token=_LECKKLAMMER then
begin
consume(_LECKKLAMMER);
paras:=parse_paras(false,true);
consume(_RECKKLAMMER);
end;
{ indexed property }
if (ppo_indexed in ppropertysym(sym)^.propoptions) then
begin
p2:=genordinalconstnode(ppropertysym(sym)^.index,ppropertysym(sym)^.indextype.def);
paras:=gencallparanode(p2,paras);
end;
end;
{ we need only a write property if a := follows }
{ if not(afterassignment) and not(in_args) then }
if token=_ASSIGNMENT then
begin
{ write property: }
{ no result }
pd:=voiddef;
if not ppropertysym(sym)^.writeaccess^.empty then
begin
case ppropertysym(sym)^.writeaccess^.firstsym^.sym^.typ of
procsym :
begin
{ generate the method call }
p1:=ccallnode.create(pprocsym(ppropertysym(sym)^.writeaccess^.firstsym^.sym),st,p1);
{ we know the procedure to call, so
force the usage of that procedure }
tcallnode(p1).procdefinition:=pprocdef(ppropertysym(sym)^.writeaccess^.def);
tcallnode(p1).left:=paras;
consume(_ASSIGNMENT);
{ read the expression }
getprocvar:=ppropertysym(sym)^.proptype.def^.deftype=procvardef;
p2:=comp_expr(true);
if getprocvar then
handle_procvar(pprocvardef(ppropertysym(sym)^.proptype.def),p2);
tcallnode(p1).left:=gencallparanode(p2,tcallnode(p1).left);
include(tcallnode(p1).flags,nf_isproperty);
getprocvar:=false;
end;
varsym :
begin
if assigned(paras) then
message(parser_e_no_paras_allowed);
{ subscribed access? }
plist:=ppropertysym(sym)^.writeaccess^.firstsym;
while assigned(plist) do
begin
if p1=nil then
p1:=genloadnode(pvarsym(plist^.sym),st)
else
p1:=gensubscriptnode(pvarsym(plist^.sym),p1);
plist:=plist^.next;
end;
include(tcallnode(p1).flags,nf_isproperty);
consume(_ASSIGNMENT);
{ read the expression }
p2:=comp_expr(true);
p1:=cassignmentnode.create(p1,p2);
end
else
begin
p1:=cerrornode.create;
Message(parser_e_no_procedure_to_access_property);
end;
end;
end
else
begin
p1:=cerrornode.create;
Message(parser_e_no_procedure_to_access_property);
end;
end
else
begin
{ read property: }
pd:=ppropertysym(sym)^.proptype.def;
if not ppropertysym(sym)^.readaccess^.empty then
begin
case ppropertysym(sym)^.readaccess^.firstsym^.sym^.typ of
varsym :
begin
if assigned(paras) then
message(parser_e_no_paras_allowed);
{ subscribed access? }
plist:=ppropertysym(sym)^.readaccess^.firstsym;
while assigned(plist) do
begin
if p1=nil then
p1:=genloadnode(pvarsym(plist^.sym),st)
else
p1:=gensubscriptnode(pvarsym(plist^.sym),p1);
plist:=plist^.next;
end;
include(p1.flags,nf_isproperty);
end;
procsym :
begin
{ generate the method call }
p1:=ccallnode.create(pprocsym(ppropertysym(sym)^.readaccess^.firstsym^.sym),st,p1);
{ we know the procedure to call, so
force the usage of that procedure }
tcallnode(p1).procdefinition:=pprocdef(ppropertysym(sym)^.readaccess^.def);
{ insert paras }
tcallnode(p1).left:=paras;
include(p1.flags,nf_isproperty);
end
else
begin
p1:=cerrornode.create;
Message(type_e_mismatch);
end;
end;
end
else
begin
{ error, no function to read property }
p1:=cerrornode.create;
Message(parser_e_no_procedure_to_access_property);
end;
end;
end;
{ the ID token has to be consumed before calling this function }
procedure do_member_read(getaddr : boolean;const sym : psym;var p1 : tnode;
var pd : pdef;var again : boolean);
var
static_name : string;
isclassref : boolean;
objdef : pobjectdef;
begin
if sym=nil then
begin
{ pattern is still valid unless
there is another ID just after the ID of sym }
Message1(sym_e_id_no_member,pattern);
p1.destroy;
p1:=cerrornode.create;
{ try to clean up }
pd:=generrordef;
again:=false;
end
else
begin
objdef:=pobjectdef(sym^.owner^.defowner);
isclassref:=(pd^.deftype=classrefdef);
{ check protected and private members }
{ please leave this code as it is, }
{ it has now the same behaviaor as TP/Delphi }
if (sp_private in sym^.symoptions) and
(objdef^.owner^.symtabletype=unitsymtable) then
Message(parser_e_cant_access_private_member);
if (sp_protected in sym^.symoptions) and
(objdef^.owner^.symtabletype=unitsymtable) then
begin
if assigned(aktprocsym^.definition^._class) then
begin
if not aktprocsym^.definition^._class^.is_related(objdef) then
Message(parser_e_cant_access_protected_member);
end
else
Message(parser_e_cant_access_protected_member);
end;
{ we assume, that only procsyms and varsyms are in an object }
{ symbol table, for classes, properties are allowed }
case sym^.typ of
procsym:
begin
p1:=ccallnode.create(pprocsym(sym),sym^.owner,p1);
do_proc_call(getaddr or
(getprocvar and
((block_type=bt_const) or
((m_tp_procvar in aktmodeswitches) and
proc_to_procvar_equal(pprocsym(sym)^.definition,getprocvardef)
)
)
),again,tcallnode(p1),pd);
if (block_type=bt_const) and
getprocvar then
handle_procvar(getprocvardef,p1);
{ now we know the real method e.g. we can check for a class method }
if isclassref and
assigned(tcallnode(p1).procdefinition) and
not(po_classmethod in tcallnode(p1).procdefinition^.procoptions) and
not(tcallnode(p1).procdefinition^.proctypeoption=potype_constructor) then
Message(parser_e_only_class_methods_via_class_ref);
end;
varsym:
begin
if isclassref then
Message(parser_e_only_class_methods_via_class_ref);
if (sp_static in sym^.symoptions) then
begin
{ static_name:=lower(srsymtable^.name^)+'_'+sym^.name;
this is wrong for static field in with symtable (PM) }
static_name:=lower(srsym^.owner^.name^)+'_'+sym^.name;
getsym(static_name,true);
p1.destroy;
p1:=genloadnode(pvarsym(srsym),srsymtable);
end
else
p1:=gensubscriptnode(pvarsym(sym),p1);
pd:=pvarsym(sym)^.vartype.def;
end;
propertysym:
begin
if isclassref then
Message(parser_e_only_class_methods_via_class_ref);
handle_propertysym(sym,srsymtable,p1,pd);
end;
else internalerror(16);
end;
end;
end;
{****************************************************************************
Factor
****************************************************************************}
{$ifdef fpc}
{$maxfpuregisters 0}
{$endif fpc}
function factor(getaddr : boolean) : tnode;
var
l : longint;
ic : TConstExprInt;
oldp1,
p1,p2,p3 : tnode;
code : integer;
pd,pd2 : pdef;
possible_error,
{$ifdef TEST_PROCSYMS}
unit_specific,
{$endif TEST_PROCSYMS}
again : boolean;
sym : psym;
classh : pobjectdef;
d : bestreal;
hs,
static_name : string;
propsym : ppropertysym;
filepos : tfileposinfo;
{---------------------------------------------
Is_func_ret
---------------------------------------------}
function is_func_ret(sym : psym) : boolean;
var
p : pprocinfo;
storesymtablestack : psymtable;
begin
is_func_ret:=false;
if not assigned(procinfo) or
((sym^.typ<>funcretsym) and ((procinfo^.flags and pi_operator)=0)) then
exit;
p:=procinfo;
while assigned(p) do
begin
{ is this an access to a function result? Accessing _RESULT is
always allowed and funcretn is generated }
if assigned(p^.funcretsym) and
((pfuncretsym(sym)=p^.resultfuncretsym) or
((pfuncretsym(sym)=p^.funcretsym) or
((pvarsym(sym)=opsym) and ((p^.flags and pi_operator)<>0))) and
(p^.returntype.def<>pdef(voiddef)) and
(token<>_LKLAMMER) and
(not ((m_tp in aktmodeswitches) and (afterassignment or in_args)))
) then
begin
if ((pvarsym(sym)=opsym) and
((p^.flags and pi_operator)<>0)) then
inc(opsym^.refs);
p1:=cfuncretnode.create;
pd:=p^.returntype.def;
tfuncretnode(p1).funcretprocinfo:=p;
tfuncretnode(p1).rettype.def:=pd;
is_func_ret:=true;
if p^.funcret_state=vs_declared then
begin
p^.funcret_state:=vs_declared_and_first_found;
include(p1.flags,nf_is_first_funcret);
end;
exit;
end;
p:=p^.parent;
end;
{ we must use the function call }
if (sym^.typ=funcretsym) then
begin
storesymtablestack:=symtablestack;
symtablestack:=srsymtable^.next;
getsym(sym^.name,true);
if srsym^.typ<>procsym then
Message(cg_e_illegal_expression);
symtablestack:=storesymtablestack;
end;
end;
{---------------------------------------------
Factor_read_id
---------------------------------------------}
procedure factor_read_id;
var
pc : pchar;
len : longint;
begin
{ allow post fix operators }
again:=true;
begin
if lastsymknown then
begin
srsym:=lastsrsym;
srsymtable:=lastsrsymtable;
lastsymknown:=false;
end
else
getsym(pattern,true);
consume(_ID);
if not is_func_ret(srsym) then
{ else it's a normal symbol }
begin
{ is it defined like UNIT.SYMBOL ? }
if srsym^.typ=unitsym then
begin
consume(_POINT);
getsymonlyin(punitsym(srsym)^.unitsymtable,pattern);
{$ifdef TEST_PROCSYMS}
unit_specific:=true;
{$endif TEST_PROCSYMS}
consume(_ID);
{$ifdef TEST_PROCSYMS}
end
else
unit_specific:=false;
{$else TEST_PROCSYMS}
end;
{$endif TEST_PROCSYMS}
if not assigned(srsym) then
Begin
p1:=cerrornode.create;
{ try to clean up }
pd:=generrordef;
end
else
Begin
{ check semantics of private }
if (srsym^.typ in [propertysym,procsym,varsym]) and
(srsymtable^.symtabletype=objectsymtable) then
begin
if (sp_private in srsym^.symoptions) and
(pobjectdef(srsym^.owner^.defowner)^.owner^.symtabletype=unitsymtable) then
Message(parser_e_cant_access_private_member);
end;
case srsym^.typ of
absolutesym : begin
p1:=genloadnode(pvarsym(srsym),srsymtable);
pd:=pabsolutesym(srsym)^.vartype.def;
end;
varsym : begin
{ are we in a class method ? }
if (srsymtable^.symtabletype=objectsymtable) and
assigned(aktprocsym) and
(po_classmethod in aktprocsym^.definition^.procoptions) then
Message(parser_e_only_class_methods);
if (sp_static in srsym^.symoptions) then
begin
static_name:=lower(srsym^.owner^.name^)+'_'+srsym^.name;
getsym(static_name,true);
end;
p1:=genloadnode(pvarsym(srsym),srsymtable);
if pvarsym(srsym)^.varstate=vs_declared then
begin
include(p1.flags,nf_first);
{ set special between first loaded until checked in firstpass }
pvarsym(srsym)^.varstate:=vs_declared_and_first_found;
end;
pd:=pvarsym(srsym)^.vartype.def;
end;
typedconstsym : begin
p1:=gentypedconstloadnode(ptypedconstsym(srsym),srsymtable);
pd:=ptypedconstsym(srsym)^.typedconsttype.def;
end;
syssym : p1:=statement_syssym(psyssym(srsym)^.number,pd);
typesym : begin
pd:=ptypesym(srsym)^.restype.def;
if not assigned(pd) then
begin
pd:=generrordef;
again:=false;
end
else
begin
{ if we read a type declaration }
{ we have to return the type and }
{ nothing else }
if block_type=bt_type then
begin
{ we don't need sym reference when it's in the
current unit or system unit, because those
units are always loaded (PFV) }
if not(assigned(pd^.owner)) or
(pd^.owner^.unitid=0) or
(pd^.owner^.unitid=1) then
p1:=gentypenode(pd,nil)
else
p1:=gentypenode(pd,ptypesym(srsym));
{ here we can also set resulttype !! }
p1.resulttype:=pd;
pd:=voiddef;
end
else { not type block }
begin
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=gentypeconvnode(p1,pd);
include(p1.flags,nf_explizit);
end
else { not LKLAMMER }
if (token=_POINT) and
is_object(pd) then
begin
consume(_POINT);
if assigned(procinfo) and
assigned(procinfo^._class) and
not(getaddr) then
begin
if procinfo^._class^.is_related(pobjectdef(pd)) then
begin
p1:=gentypenode(pd,ptypesym(srsym));
p1.resulttype:=pd;
{ search also in inherited methods }
repeat
srsymtable:=pobjectdef(pd)^.symtable;
sym:=pvarsym(srsymtable^.search(pattern));
if assigned(sym) then
break;
pd:=pobjectdef(pd)^.childof;
until not assigned(pd);
consume(_ID);
do_member_read(false,sym,p1,pd,again);
end
else
begin
Message(parser_e_no_super_class);
pd:=generrordef;
again:=false;
end;
end
else
begin
{ allows @TObject.Load }
{ also allows static methods and variables }
p1:=ctypenode.create(nil,nil);
p1.resulttype:=pd;
{ TP allows also @TMenu.Load if Load is only }
{ defined in an anchestor class }
sym:=pvarsym(search_class_member(pobjectdef(pd),pattern));
if not assigned(sym) then
Message1(sym_e_id_no_member,pattern)
else if not(getaddr) and not(sp_static in sym^.symoptions) then
Message(sym_e_only_static_in_static)
else
begin
consume(_ID);
do_member_read(getaddr,sym,p1,pd,again);
end;
end;
end
else
begin
{ class reference ? }
if is_class(pd) then
begin
if getaddr and (token=_POINT) then
begin
consume(_POINT);
{ allows @Object.Method }
{ also allows static methods and variables }
p1:=gentypenode(nil,nil);
p1.resulttype:=pd;
{ TP allows also @TMenu.Load if Load is only }
{ defined in an anchestor class }
sym:=pvarsym(search_class_member(pobjectdef(pd),pattern));
if not assigned(sym) then
Message1(sym_e_id_no_member,pattern)
else
begin
consume(_ID);
do_member_read(getaddr,sym,p1,pd,again);
end;
end
else
begin
p1:=gentypenode(pd,nil);
p1.resulttype:=pd;
pd:=new(pclassrefdef,init(pd));
p1:=cloadvmtnode.create(p1);
p1.resulttype:=pd;
end;
end
else
begin
{ generate a type node }
{ (for typeof etc) }
if allow_type then
begin
p1:=gentypenode(pd,nil);
{ here we must use typenodetype explicitly !! PM
p1.resulttype:=pd; }
pd:=voiddef;
end
else
Message(parser_e_no_type_not_allowed_here);
end;
end;
end;
end;
end;
enumsym : begin
p1:=genenumnode(penumsym(srsym));
pd:=p1.resulttype;
end;
constsym : begin
case pconstsym(srsym)^.consttyp of
constint :
{ do a very dirty trick to bootstrap this code }
if (pconstsym(srsym)^.value>=-(int64(2147483647)+int64(1))) and (pconstsym(srsym)^.value<=2147483647) then
p1:=genordinalconstnode(pconstsym(srsym)^.value,s32bitdef)
else
p1:=genordinalconstnode(pconstsym(srsym)^.value,cs64bitdef);
conststring :
begin
len:=pconstsym(srsym)^.len;
if not(cs_ansistrings in aktlocalswitches) and (len>255) then
len:=255;
getmem(pc,len+1);
move(pchar(tpointerord(pconstsym(srsym)^.value))^,pc^,len);
pc[len]:=#0;
p1:=genpcharconstnode(pc,len);
end;
constchar :
p1:=genordinalconstnode(pconstsym(srsym)^.value,cchardef);
constreal :
p1:=genrealconstnode(pbestreal(tpointerord(pconstsym(srsym)^.value))^,bestrealdef^);
constbool :
p1:=genordinalconstnode(pconstsym(srsym)^.value,booldef);
constset :
p1:=gensetconstnode(pconstset(tpointerord(pconstsym(srsym)^.value)),
psetdef(pconstsym(srsym)^.consttype.def));
constord :
p1:=genordinalconstnode(pconstsym(srsym)^.value,
pconstsym(srsym)^.consttype.def);
constpointer :
p1:=genpointerconstnode(pconstsym(srsym)^.value,
pconstsym(srsym)^.consttype.def);
constnil :
p1:=cnilnode.create;
constresourcestring:
begin
p1:=genloadnode(pvarsym(srsym),srsymtable);
p1.resulttype:=cansistringdef;
end;
end;
pd:=p1.resulttype;
end;
procsym : begin
{ are we in a class method ? }
possible_error:=(srsymtable^.symtabletype=objectsymtable) and
assigned(aktprocsym) and
(po_classmethod in aktprocsym^.definition^.procoptions);
p1:=gencallnode(pprocsym(srsym),srsymtable);
{$ifdef TEST_PROCSYMS}
p1.unit_specific:=unit_specific;
{$endif TEST_PROCSYMS}
do_proc_call(getaddr or
(getprocvar and
((block_type=bt_const) or
((m_tp_procvar in aktmodeswitches) and
proc_to_procvar_equal(pprocsym(srsym)^.definition,getprocvardef)
)
)
),again,tcallnode(p1),pd);
if (block_type=bt_const) and
getprocvar then
handle_procvar(getprocvardef,p1);
if possible_error and
not(po_classmethod in tcallnode(p1).procdefinition^.procoptions) then
Message(parser_e_only_class_methods);
end;
propertysym : begin
{ access to property in a method }
{ are we in a class method ? }
if (srsymtable^.symtabletype=objectsymtable) and
assigned(aktprocsym) and
(po_classmethod in aktprocsym^.definition^.procoptions) then
Message(parser_e_only_class_methods);
{ no method pointer }
p1:=nil;
handle_propertysym(srsym,srsymtable,p1,pd);
end;
errorsym : begin
p1:=cerrornode.create;
p1.resulttype:=generrordef;
pd:=generrordef;
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
parse_paras(false,false);
consume(_RKLAMMER);
end;
end;
else
begin
p1:=cerrornode.create;
pd:=generrordef;
Message(cg_e_illegal_expression);
end;
end; { end case }
end;
end;
end;
end;
{---------------------------------------------
Factor_Read_Set
---------------------------------------------}
{ Read a set between [] }
function factor_read_set:tnode;
var
p1 : tnode;
lastp,
buildp : tarrayconstructornode;
begin
buildp:=nil;
{ be sure that a least one arrayconstructn is used, also for an
empty [] }
if token=_RECKKLAMMER then
buildp:=carrayconstructornode.create(nil,buildp)
else
begin
while true do
begin
p1:=comp_expr(true);
if token=_POINTPOINT then
begin
consume(_POINTPOINT);
p2:=comp_expr(true);
p1:=carrayconstructorrangenode.create(p1,p2);
end;
{ insert at the end of the tree, to get the correct order }
if not assigned(buildp) then
begin
buildp:=carrayconstructornode.create(p1,nil);
lastp:=buildp;
end
else
begin
lastp.right:=carrayconstructornode.create(p1,nil);
lastp:=tarrayconstructornode(lastp.right);
end;
{ there could be more elements }
if token=_COMMA then
consume(_COMMA)
else
break;
end;
end;
factor_read_set:=buildp;
end;
{---------------------------------------------
Helpers
---------------------------------------------}
procedure check_tokenpos;
begin
if (p1<>oldp1) then
begin
if assigned(p1) then
p1.set_tree_filepos(filepos);
oldp1:=p1;
filepos:=akttokenpos;
end;
end;
{---------------------------------------------
PostFixOperators
---------------------------------------------}
procedure postfixoperators;
{ tries to avoid syntax errors after invalid qualifiers }
procedure recoverconsume_postfixops;
begin
while true do
begin
case token of
_CARET:
consume(_CARET);
_POINT:
begin
consume(_POINT);
if token=_ID then
consume(_ID);
end;
_LECKKLAMMER:
begin
consume(_LECKKLAMMER);
repeat
comp_expr(true);
if token=_COMMA then
consume(_COMMA)
else
break;
until false;
consume(_RECKKLAMMER);
end
else
break;
end;
end;
end;
var
store_static : boolean;
{ p1 and p2 must contain valid value_str }
begin
check_tokenpos;
while again do
begin
{ prevent crashes with unknown types }
if not assigned(pd) then
begin
recoverconsume_postfixops;
exit;
end;
{ handle token }
case token of
_CARET:
begin
consume(_CARET);
if (pd^.deftype<>pointerdef) then
begin
{ ^ as binary operator is a problem!!!! (FK) }
again:=false;
Message(cg_e_invalid_qualifier);
recoverconsume_postfixops;
p1.destroy;
p1:=cerrornode.create;
end
else
begin
p1:=cderefnode.create(p1);
pd:=ppointerdef(pd)^.pointertype.def;
end;
end;
_LECKKLAMMER:
begin
if is_class_or_interface(pd) then
begin
{ default property }
propsym:=search_default_property(pobjectdef(pd));
if not(assigned(propsym)) then
begin
p1.destroy;
p1:=cerrornode.create;
again:=false;
message(parser_e_no_default_property_available);
end
else
handle_propertysym(propsym,propsym^.owner,p1,pd);
end
else
begin
consume(_LECKKLAMMER);
repeat
case pd^.deftype of
pointerdef:
begin
pd:=ppointerdef(pd)^.pointertype.def;
{ support delphi autoderef }
if (pd^.deftype=arraydef) and
(m_autoderef in aktmodeswitches) then
begin
p1:=cderefnode.create(p1);
pd:=parraydef(pd)^.elementtype.def;
end;
p2:=comp_expr(true);
p1:=cvecnode.create(p1,p2);
end;
stringdef : begin
p2:=comp_expr(true);
p1:=cvecnode.create(p1,p2);
pd:=cchardef
end;
arraydef : begin
p2:=comp_expr(true);
{ support SEG:OFS for go32v2 Mem[] }
if (target_info.target=target_i386_go32v2) and
(p1.nodetype=loadn) and
assigned(tloadnode(p1).symtableentry) and
assigned(tloadnode(p1).symtableentry^.owner^.name) and
(tloadnode(p1).symtableentry^.owner^.name^='SYSTEM') and
((tloadnode(p1).symtableentry^.name='MEM') or
(tloadnode(p1).symtableentry^.name='MEMW') or
(tloadnode(p1).symtableentry^.name='MEML')) then
begin
if (token=_COLON) then
begin
consume(_COLON);
p3:=caddnode.create(muln,genordinalconstnode($10,s32bitdef),p2);
p2:=comp_expr(true);
p2:=caddnode.create(addn,p2,p3);
p1:=cvecnode.create(p1,p2);
include(tvecnode(p1).flags,nf_memseg);
include(tvecnode(p1).flags,nf_memindex);
end
else
begin
p1:=cvecnode.create(p1,p2);
include(tvecnode(p1).flags,nf_memindex);
end;
end
else
p1:=cvecnode.create(p1,p2);
pd:=parraydef(pd)^.elementtype.def;
end;
else
begin
Message(cg_e_invalid_qualifier);
p1.destroy;
p1:=cerrornode.create;
comp_expr(true);
again:=false;
end;
end;
if token=_COMMA then
consume(_COMMA)
else
break;
until false;
consume(_RECKKLAMMER);
end;
end;
_POINT : begin
consume(_POINT);
if (pd^.deftype=pointerdef) and
(m_autoderef in aktmodeswitches) then
begin
p1:=cderefnode.create(p1);
pd:=ppointerdef(pd)^.pointertype.def;
end;
case pd^.deftype of
recorddef:
begin
sym:=psym(precorddef(pd)^.symtable^.search(pattern));
if assigned(sym) and
(sym^.typ=varsym) then
begin
p1:=gensubscriptnode(pvarsym(sym),p1);
pd:=pvarsym(sym)^.vartype.def;
end
else
begin
Message1(sym_e_illegal_field,pattern);
p1.destroy;
p1:=cerrornode.create;
end;
consume(_ID);
end;
classrefdef:
begin
classh:=pobjectdef(pclassrefdef(pd)^.pointertype.def);
sym:=nil;
while assigned(classh) do
begin
sym:=psym(classh^.symtable^.search(pattern));
srsymtable:=classh^.symtable;
if assigned(sym) then
break;
classh:=classh^.childof;
end;
if sym=nil then
begin
Message1(sym_e_id_no_member,pattern);
p1.destroy;
p1:=cerrornode.create;
{ try to clean up }
pd:=generrordef;
consume(_ID);
end
else
begin
consume(_ID);
do_member_read(getaddr,sym,p1,pd,again);
end;
end;
objectdef:
begin
classh:=pobjectdef(pd);
sym:=nil;
store_static:=allow_only_static;
allow_only_static:=false;
while assigned(classh) do
begin
sym:=psym(classh^.symtable^.search(pattern));
srsymtable:=classh^.symtable;
if assigned(sym) then
break;
classh:=classh^.childof;
end;
allow_only_static:=store_static;
if sym=nil then
begin
Message1(sym_e_id_no_member,pattern);
p1.destroy;
p1:=cerrornode.create;
{ try to clean up }
pd:=generrordef;
consume(_ID);
end
else
begin
consume(_ID);
do_member_read(getaddr,sym,p1,pd,again);
end;
end;
pointerdef:
begin
Message(cg_e_invalid_qualifier);
if ppointerdef(pd)^.pointertype.def^.deftype in [recorddef,objectdef,classrefdef] then
Message(parser_h_maybe_deref_caret_missing);
end;
else
begin
Message(cg_e_invalid_qualifier);
p1.destroy;
p1:=cerrornode.create;
consume(_ID);
end;
end;
end;
else
begin
{ is this a procedure variable ? }
if assigned(pd) then
begin
if (pd^.deftype=procvardef) then
begin
if getprocvar and is_equal(pd,getprocvardef) then
again:=false
else
if (token=_LKLAMMER) or
((pprocvardef(pd)^.para^.empty) and
(not((token in [_ASSIGNMENT,_UNEQUAL,_EQUAL]))) and
(not afterassignment) and
(not in_args)) then
begin
{ do this in a strange way }
{ it's not a clean solution }
p2:=p1;
p1:=gencallnode(nil,nil);
tcallnode(p1).right:=p2;
{$ifdef TEST_PROCSYMS}
p1.unit_specific:=unit_specific;
{$endif TEST_PROCSYMS}
tcallnode(p1).symtableprocentry:=pprocsym(sym);
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
tcallnode(p1).left:=parse_paras(false,false);
consume(_RKLAMMER);
end;
pd:=pprocvardef(pd)^.rettype.def;
{ proc():= is never possible }
if token=_ASSIGNMENT then
begin
Message(cg_e_illegal_expression);
p1:=cerrornode.create;
again:=false;
end;
p1.resulttype:=pd;
end
else
again:=false;
p1.resulttype:=pd;
end
else
again:=false;
end
else
again:=false;
end;
end;
check_tokenpos;
end; { while again }
end;
{---------------------------------------------
Factor (Main)
---------------------------------------------}
begin
oldp1:=nil;
p1:=nil;
filepos:=akttokenpos;
if token=_ID then
begin
factor_read_id;
{ handle post fix operators }
postfixoperators;
end
else
case token of
_NEW : begin
consume(_NEW);
consume(_LKLAMMER);
{allow_type:=true;}
p1:=factor(false);
{allow_type:=false;}
if p1.nodetype<>typen then
begin
Message(type_e_type_id_expected);
p1.destroy;
pd:=generrordef;
end
else
pd:=ttypenode(p1).typenodetype;
pd2:=pd;
if (pd^.deftype<>pointerdef) then
Message1(type_e_pointer_type_expected,pd^.typename)
else
if token=_RKLAMMER then
begin
if (ppointerdef(pd)^.pointertype.def^.deftype=objectdef) and
(oo_has_vmt in pobjectdef(ppointerdef(pd)^.pointertype.def)^.objectoptions) then
Message(parser_w_use_extended_syntax_for_objects);
p1:=cnewnode.create(nil);
p1.resulttype:=pd2;
consume(_RKLAMMER);
end
else
begin
p1.destroy;
p1:=chnewnode.create;
p1.resulttype:=ppointerdef(pd)^.pointertype.def;
consume(_COMMA);
afterassignment:=false;
{ determines the current object defintion }
classh:=pobjectdef(ppointerdef(pd)^.pointertype.def);
if classh^.deftype<>objectdef then
Message(parser_e_pointer_to_class_expected)
else
begin
{ check for an abstract class }
if (oo_has_abstract in classh^.objectoptions) then
Message(sym_e_no_instance_of_abstract_object);
{ search the constructor also in the symbol tables of
the parents }
sym:=nil;
while assigned(classh) do
begin
sym:=psym(classh^.symtable^.search(pattern));
srsymtable:=classh^.symtable;
if assigned(sym) then
break;
classh:=classh^.childof;
end;
consume(_ID);
do_member_read(false,sym,p1,pd,again);
if (p1.nodetype<>calln) or
(assigned(tcallnode(p1).procdefinition) and
(tcallnode(p1).procdefinition^.proctypeoption<>potype_constructor)) then
Message(parser_e_expr_have_to_be_constructor_call);
end;
p1:=cnewnode.create(p1);
{ set the resulttype }
p1.resulttype:=pd2;
consume(_RKLAMMER);
end;
postfixoperators;
end;
_SELF : begin
again:=true;
consume(_SELF);
if not assigned(procinfo^._class) then
begin
p1:=cerrornode.create;
pd:=generrordef;
again:=false;
Message(parser_e_self_not_in_method);
end
else
begin
if (po_classmethod in aktprocsym^.definition^.procoptions) then
begin
{ self in class methods is a class reference type }
pd:=new(pclassrefdef,init(procinfo^._class));
p1:=genselfnode(pd);
p1.resulttype:=pd;
end
else
begin
p1:=genselfnode(procinfo^._class);
p1.resulttype:=procinfo^._class;
end;
pd:=p1.resulttype;
postfixoperators;
end;
end;
_INHERITED : begin
again:=true;
consume(_INHERITED);
if assigned(procinfo^._class) then
begin
{ if inherited; only then we need the method with
the same name }
if token=_SEMICOLON then
begin
hs:=aktprocsym^.name;
auto_inherited:=true
end
else
begin
hs:=pattern;
consume(_ID);
auto_inherited:=false;
end;
classh:=procinfo^._class^.childof;
while assigned(classh) do
begin
srsymtable:=pobjectdef(classh)^.symtable;
sym:=psym(srsymtable^.search(hs));
if assigned(sym) then
begin
{ only for procsyms we need to set the type (PFV) }
case sym^.typ of
procsym :
begin
p1:=ctypenode.create(nil,nil);
p1.resulttype:=classh;
pd:=p1.resulttype;
end;
varsym :
begin
p1:=nil;
pd:=pvarsym(sym)^.vartype.def;
end;
propertysym :
begin
p1:=nil;
pd:=ppropertysym(sym)^.proptype.def;
end;
else
internalerror(83251763);
end;
do_member_read(false,sym,p1,pd,again);
break;
end;
classh:=classh^.childof;
end;
if classh=nil then
begin
Message1(sym_e_id_no_member,hs);
again:=false;
pd:=generrordef;
p1:=cerrornode.create;
end;
{ turn auto inheriting off }
auto_inherited:=false;
end
else
begin
Message(parser_e_generic_methods_only_in_methods);
again:=false;
pd:=generrordef;
p1:=cerrornode.create;
end;
postfixoperators;
end;
_INTCONST : begin
valint(pattern,l,code);
if code<>0 then
begin
{ try int64 if available }
{ if no int64 available longint is tried a second }
{ time which doesn't hurt }
val(pattern,ic,code);
if code<>0 then
begin
val(pattern,d,code);
if code<>0 then
begin
Message(cg_e_invalid_integer);
consume(_INTCONST);
l:=1;
p1:=genordinalconstnode(l,s32bitdef);
end
else
begin
consume(_INTCONST);
p1:=genrealconstnode(d,bestrealdef^);
end;
end
else
begin
consume(_INTCONST);
p1:=genordinalconstnode(ic,cs64bitdef);
end;
end
else
begin
consume(_INTCONST);
p1:=genordinalconstnode(l,s32bitdef)
end;
end;
_REALNUMBER : begin
val(pattern,d,code);
if code<>0 then
begin
Message(parser_e_error_in_real);
d:=1.0;
end;
consume(_REALNUMBER);
p1:=genrealconstnode(d,bestrealdef^);
end;
_STRING : begin
pd:=string_dec;
{ STRING can be also a type cast }
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=gentypeconvnode(p1,pd);
include(p1.flags,nf_explizit);
{ handle postfix operators here e.g. string(a)[10] }
again:=true;
postfixoperators;
end
else
p1:=gentypenode(pd,nil);
end;
_FILE : begin
pd:=cfiledef;
consume(_FILE);
{ FILE can be also a type cast }
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=gentypeconvnode(p1,pd);
include(p1.flags,nf_explizit);
{ handle postfix operators here e.g. string(a)[10] }
again:=true;
postfixoperators;
end
else
p1:=gentypenode(pd,nil);
end;
_CSTRING : begin
p1:=genstringconstnode(pattern,st_default);
consume(_CSTRING);
end;
_CCHAR : begin
p1:=genordinalconstnode(ord(pattern[1]),cchardef);
consume(_CCHAR);
end;
_KLAMMERAFFE : begin
consume(_KLAMMERAFFE);
got_addrn:=true;
{ support both @<x> and @(<x>) }
if token=_LKLAMMER then
begin
consume(_LKLAMMER);
p1:=factor(true);
consume(_RKLAMMER);
if token in [_CARET,_POINT,_LECKKLAMMER] then
begin
{ we need the resulttype }
{ of the expression in pd }
do_firstpass(p1);
pd:=p1.resulttype;
again:=true;
postfixoperators;
end;
end
else
p1:=factor(true);
got_addrn:=false;
p1:=caddrnode.create(p1);
end;
_LKLAMMER : begin
consume(_LKLAMMER);
p1:=comp_expr(true);
consume(_RKLAMMER);
{ it's not a good solution }
{ but (a+b)^ makes some problems }
if token in [_CARET,_POINT,_LECKKLAMMER] then
begin
{ we need the resulttype }
{ of the expression in pd }
do_firstpass(p1);
pd:=p1.resulttype;
again:=true;
postfixoperators;
end;
end;
_LECKKLAMMER : begin
consume(_LECKKLAMMER);
p1:=factor_read_set;
consume(_RECKKLAMMER);
end;
_PLUS : begin
consume(_PLUS);
p1:=factor(false);
end;
_MINUS : begin
consume(_MINUS);
p1:=sub_expr(oppower,false);
p1:=cunaryminusnode.create(p1);
end;
_OP_NOT : begin
consume(_OP_NOT);
p1:=factor(false);
p1:=cnotnode.create(p1);
end;
_TRUE : begin
consume(_TRUE);
p1:=genordinalconstnode(1,booldef);
end;
_FALSE : begin
consume(_FALSE);
p1:=genordinalconstnode(0,booldef);
end;
_NIL : begin
consume(_NIL);
p1:=cnilnode.create;
end;
else
begin
p1:=cerrornode.create;
consume(token);
Message(cg_e_illegal_expression);
end;
end;
{ generate error node if no node is created }
if not assigned(p1) then
p1:=cerrornode.create;
{ tp7 procvar handling, but not if the next token
will be a := }
if (m_tp_procvar in aktmodeswitches) and
(token<>_ASSIGNMENT) then
check_tp_procvar(p1);
factor:=p1;
check_tokenpos;
end;
{$ifdef fpc}
{$maxfpuregisters default}
{$endif fpc}
{****************************************************************************
Sub_Expr
****************************************************************************}
const
{ Warning these stay be ordered !! }
operator_levels:array[Toperator_precedence] of set of Ttoken=
([_LT,_LTE,_GT,_GTE,_EQUAL,_UNEQUAL,_OP_IN,_OP_IS],
[_PLUS,_MINUS,_OP_OR,_OP_XOR],
[_CARET,_SYMDIF,_STARSTAR,_STAR,_SLASH,
_OP_AS,_OP_AND,_OP_DIV,_OP_MOD,_OP_SHL,_OP_SHR],
[_STARSTAR] );
function sub_expr(pred_level:Toperator_precedence;accept_equal : boolean):tnode;
{Reads a subexpression while the operators are of the current precedence
level, or any higher level. Replaces the old term, simpl_expr and
simpl2_expr.}
var
p1,p2 : tnode;
oldt : Ttoken;
filepos : tfileposinfo;
begin
if pred_level=highest_precedence then
p1:=factor(false)
else
p1:=sub_expr(succ(pred_level),true);
repeat
if (token in operator_levels[pred_level]) and
((token<>_EQUAL) or accept_equal) then
begin
oldt:=token;
filepos:=akttokenpos;
consume(token);
if pred_level=highest_precedence then
p2:=factor(false)
else
p2:=sub_expr(succ(pred_level),true);
case oldt of
_PLUS :
p1:=caddnode.create(addn,p1,p2);
_MINUS :
p1:=caddnode.create(subn,p1,p2);
_STAR :
p1:=caddnode.create(muln,p1,p2);
_SLASH :
p1:=caddnode.create(slashn,p1,p2);
_EQUAL :
p1:=caddnode.create(equaln,p1,p2);
_GT :
p1:=caddnode.create(gtn,p1,p2);
_LT :
p1:=caddnode.create(ltn,p1,p2);
_GTE :
p1:=caddnode.create(gten,p1,p2);
_LTE :
p1:=caddnode.create(lten,p1,p2);
_SYMDIF :
p1:=caddnode.create(symdifn,p1,p2);
_STARSTAR :
p1:=caddnode.create(starstarn,p1,p2);
_OP_AS :
p1:=casnode.create(p1,p2);
_OP_IN :
p1:=cinnode.create(p1,p2);
_OP_IS :
p1:=cisnode.create(p1,p2);
_OP_OR :
p1:=caddnode.create(orn,p1,p2);
_OP_AND :
p1:=caddnode.create(andn,p1,p2);
_OP_DIV :
p1:=cmoddivnode.create(divn,p1,p2);
_OP_NOT :
p1:=cnotnode.create(p1);
_OP_MOD :
p1:=cmoddivnode.create(modn,p1,p2);
_OP_SHL :
p1:=cshlshrnode.create(shln,p1,p2);
_OP_SHR :
p1:=cshlshrnode.create(shrn,p1,p2);
_OP_XOR :
p1:=caddnode.create(xorn,p1,p2);
_ASSIGNMENT :
p1:=cassignmentnode.create(p1,p2);
_CARET :
p1:=caddnode.create(caretn,p1,p2);
_UNEQUAL :
p1:=caddnode.create(unequaln,p1,p2);
end;
p1.set_tree_filepos(filepos);
end
else
break;
until false;
sub_expr:=p1;
end;
function comp_expr(accept_equal : boolean):tnode;
var
oldafterassignment : boolean;
p1 : tnode;
begin
oldafterassignment:=afterassignment;
afterassignment:=true;
p1:=sub_expr(opcompare,accept_equal);
afterassignment:=oldafterassignment;
comp_expr:=p1;
end;
function expr : tnode;
var
p1,p2 : tnode;
oldafterassignment : boolean;
oldp1 : tnode;
filepos : tfileposinfo;
begin
oldafterassignment:=afterassignment;
p1:=sub_expr(opcompare,true);
filepos:=akttokenpos;
if (m_tp_procvar in aktmodeswitches) and
(token<>_ASSIGNMENT) then
check_tp_procvar(p1);
if token in [_ASSIGNMENT,_PLUSASN,_MINUSASN,_STARASN,_SLASHASN] then
afterassignment:=true;
oldp1:=p1;
case token of
_POINTPOINT :
begin
consume(_POINTPOINT);
p2:=sub_expr(opcompare,true);
p1:=crangenode.create(p1,p2);
end;
_ASSIGNMENT :
begin
consume(_ASSIGNMENT);
if (p1.resulttype<>nil) and (p1.resulttype^.deftype=procvardef) then
begin
getprocvar:=true;
getprocvardef:=pprocvardef(p1.resulttype);
end;
p2:=sub_expr(opcompare,true);
if getprocvar then
handle_procvar(getprocvardef,p2);
getprocvar:=false;
p1:=cassignmentnode.create(p1,p2);
end;
_PLUSASN :
begin
consume(_PLUSASN);
p2:=sub_expr(opcompare,true);
p1:=cassignmentnode.create(p1,caddnode.create(addn,p1.getcopy,p2));
end;
_MINUSASN :
begin
consume(_MINUSASN);
p2:=sub_expr(opcompare,true);
p1:=cassignmentnode.create(p1,caddnode.create(subn,p1.getcopy,p2));
end;
_STARASN :
begin
consume(_STARASN );
p2:=sub_expr(opcompare,true);
p1:=cassignmentnode.create(p1,caddnode.create(muln,p1.getcopy,p2));
end;
_SLASHASN :
begin
consume(_SLASHASN );
p2:=sub_expr(opcompare,true);
p1:=cassignmentnode.create(p1,caddnode.create(slashn,p1.getcopy,p2));
end;
end;
afterassignment:=oldafterassignment;
if p1<>oldp1 then
p1.set_tree_filepos(filepos);
expr:=p1;
end;
function get_intconst:longint;
{Reads an expression, tries to evalute it and check if it is an integer
constant. Then the constant is returned.}
var
p:tnode;
begin
p:=comp_expr(true);
do_firstpass(p);
if not codegenerror then
begin
if (p.nodetype<>ordconstn) and
(p.resulttype^.deftype=orddef) and
not(Porddef(p.resulttype)^.typ in [uvoid,uchar,bool8bit,bool16bit,bool32bit]) then
Message(cg_e_illegal_expression)
else
get_intconst:=tordconstnode(p).value;
end;
p.free;
end;
function get_stringconst:string;
{Reads an expression, tries to evaluate it and checks if it is a string
constant. Then the constant is returned.}
var
p:tnode;
begin
get_stringconst:='';
p:=comp_expr(true);
do_firstpass(p);
if p.nodetype<>stringconstn then
begin
if (p.nodetype=ordconstn) and is_char(p.resulttype) then
get_stringconst:=char(tordconstnode(p).value)
else
Message(cg_e_illegal_expression);
end
else
get_stringconst:=strpas(tstringconstnode(p).value_str);
p.free;
end;
end.
{
$Log$
Revision 1.17 2000-11-09 17:46:55 florian
* System.TypeInfo fixed
+ System.Finalize implemented
+ some new keywords for interface support added
Revision 1.16 2000/11/06 20:30:55 peter
* more fixes to get make cycle working
Revision 1.15 2000/11/04 14:25:20 florian
+ merged Attila's changes for interfaces, not tested yet
Revision 1.14 2000/10/31 22:02:49 peter
* symtable splitted, no real code changes
Revision 1.13 2000/10/26 23:40:54 peter
* fixed crash with call from type decl which is not allowed (merged)
Revision 1.12 2000/10/21 18:16:12 florian
* a lot of changes:
- basic dyn. array support
- basic C++ support
- some work for interfaces done
....
Revision 1.11 2000/10/14 10:14:51 peter
* moehrendorf oct 2000 rewrite
Revision 1.10 2000/10/01 19:48:25 peter
* lot of compile updates for cg11
Revision 1.9 2000/09/24 21:19:50 peter
* delphi compile fixes
Revision 1.8 2000/09/24 15:06:22 peter
* use defines.inc
Revision 1.7 2000/08/27 16:11:51 peter
* moved some util functions from globals,cobjects to cutils
* splitted files into finput,fmodule
Revision 1.6 2000/08/20 15:12:49 peter
* auto derefence mode for array pointer (merged)
Revision 1.5 2000/08/16 18:33:53 peter
* splitted namedobjectitem.next into indexnext and listnext so it
can be used in both lists
* don't allow "word = word" type definitions (merged)
Revision 1.4 2000/08/16 13:06:06 florian
+ support of 64 bit integer constants
Revision 1.3 2000/08/04 22:00:52 peter
* merges from fixes
Revision 1.2 2000/07/13 11:32:44 michael
+ removed logs
}
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