{
Copyright (c) 1998-2002 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 fpcdefs.inc}
interface
uses
symtype,symdef,symbase,
node,ncal,
tokens,globtype,globals;
{ 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;
procedure string_dec(var def: tdef);
procedure propaccesslist_to_node(var p1:tnode;st:TSymtable;pl:tpropaccesslist);
function node_to_propaccesslist(p1:tnode):tpropaccesslist;
function parse_paras(__colon,__namedpara : boolean;end_of_paras : ttoken) : tnode;
{ the ID token has to be consumed before calling this function }
procedure do_member_read(classh:tobjectdef;getaddr : boolean;sym : tsym;var p1 : tnode;var again : boolean;callflags:tcallnodeflags);
function get_intconst:TConstExprInt;
function get_stringconst:string;
implementation
uses
{ common }
cutils,
{ global }
verbose,
systems,widestr,
{ symtable }
symconst,symtable,symsym,defutil,defcmp,
{ module }
fmodule,ppu,
{ pass 1 }
pass_1,htypechk,
nmat,nadd,nmem,nset,ncnv,ninl,ncon,nld,nflw,nbas,nutils,
{ parser }
scanner,
pbase,pinline,ptype,
{ codegen }
cgbase,procinfo,cpuinfo
;
{ 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
{ true, if the inherited call is anonymous }
anon_inherited : boolean = false;
{ last def found, only used by anon. inherited calls to insert proper type casts }
srdef : tdef = nil;
procedure string_dec(var def:tdef);
{ reads a string type with optional length }
{ and returns a pointer to the string }
{ definition }
var
p : tnode;
begin
def:=cshortstringtype;
consume(_STRING);
if try_to_consume(_LECKKLAMMER) then
begin
p:=comp_expr(true);
if not is_constintnode(p) then
begin
Message(parser_e_illegal_expression);
{ error recovery }
consume(_RECKKLAMMER);
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
begin
{ longstring is currently unsupported (CEC)! }
{ t:=tstringdef.createlong(tordconstnode(p).value))}
Message(parser_e_invalid_string_size);
tordconstnode(p).value:=255;
def:=tstringdef.createshort(tordconstnode(p).value);
end
else
if tordconstnode(p).value<>255 then
def:=tstringdef.createshort(tordconstnode(p).value);
end;
p.free;
end
else
begin
if cs_ansistrings in current_settings.localswitches then
def:=cansistringtype
else
def:=cshortstringtype;
end;
end;
procedure propaccesslist_to_node(var p1:tnode;st:TSymtable;pl:tpropaccesslist);
var
plist : ppropaccesslistitem;
begin
plist:=pl.firstsym;
while assigned(plist) do
begin
case plist^.sltype of
sl_load :
begin
addsymref(plist^.sym);
if not assigned(st) then
st:=plist^.sym.owner;
{ p1 can already contain the loadnode of
the class variable. When there is no tree yet we
may need to load it for with or objects }
if not assigned(p1) then
begin
case st.symtabletype of
withsymtable :
p1:=tnode(twithsymtable(st).withrefnode).getcopy;
ObjectSymtable :
p1:=load_self_node;
end;
end;
if assigned(p1) then
p1:=csubscriptnode.create(plist^.sym,p1)
else
p1:=cloadnode.create(plist^.sym,st);
end;
sl_subscript :
begin
addsymref(plist^.sym);
p1:=csubscriptnode.create(plist^.sym,p1);
end;
sl_typeconv :
p1:=ctypeconvnode.create_explicit(p1,plist^.def);
sl_absolutetype :
begin
p1:=ctypeconvnode.create(p1,plist^.def);
include(p1.flags,nf_absolute);
end;
sl_vec :
p1:=cvecnode.create(p1,cordconstnode.create(plist^.value,plist^.valuedef,true));
else
internalerror(200110205);
end;
plist:=plist^.next;
end;
end;
function node_to_propaccesslist(p1:tnode):tpropaccesslist;
var
sl : tpropaccesslist;
procedure addnode(p:tnode);
begin
case p.nodetype of
subscriptn :
begin
addnode(tsubscriptnode(p).left);
sl.addsym(sl_subscript,tsubscriptnode(p).vs);
end;
typeconvn :
begin
addnode(ttypeconvnode(p).left);
if nf_absolute in ttypeconvnode(p).flags then
sl.addtype(sl_absolutetype,ttypeconvnode(p).totypedef)
else
sl.addtype(sl_typeconv,ttypeconvnode(p).totypedef);
end;
vecn :
begin
addnode(tvecnode(p).left);
if tvecnode(p).right.nodetype=ordconstn then
sl.addconst(sl_vec,tordconstnode(tvecnode(p).right).value,tvecnode(p).right.resultdef)
else
begin
Message(parser_e_illegal_expression);
{ recovery }
sl.addconst(sl_vec,0,tvecnode(p).right.resultdef);
end;
end;
loadn :
sl.addsym(sl_load,tloadnode(p).symtableentry);
else
internalerror(200310282);
end;
end;
begin
sl:=tpropaccesslist.create;
addnode(p1);
result:=sl;
end;
function parse_paras(__colon,__namedpara : boolean;end_of_paras : ttoken) : tnode;
var
p1,p2,argname : tnode;
prev_in_args,
old_named_args_allowed,
old_allow_array_constructor : boolean;
begin
if token=end_of_paras then
begin
parse_paras:=nil;
exit;
end;
{ save old values }
prev_in_args:=in_args;
old_allow_array_constructor:=allow_array_constructor;
old_named_args_allowed:=named_args_allowed;
{ set para parsing values }
in_args:=true;
named_args_allowed:=false;
inc(parsing_para_level);
allow_array_constructor:=true;
p2:=nil;
repeat
if __namedpara then
begin
if token=_COMMA then
begin
{ empty parameter }
p2:=ccallparanode.create(cnothingnode.create,p2);
end
else
begin
named_args_allowed:=true;
p1:=comp_expr(true);
named_args_allowed:=false;
if found_arg_name then
begin
argname:=p1;
p1:=comp_expr(true);
p2:=ccallparanode.create(p1,p2);
tcallparanode(p2).parametername:=argname;
end
else
p2:=ccallparanode.create(p1,p2);
found_arg_name:=false;
end;
end
else
begin
p1:=comp_expr(true);
p2:=ccallparanode.create(p1,p2);
end;
{ it's for the str(l:5,s); }
if __colon and (token=_COLON) then
begin
consume(_COLON);
p1:=comp_expr(true);
p2:=ccallparanode.create(p1,p2);
include(tcallparanode(p2).callparaflags,cpf_is_colon_para);
if try_to_consume(_COLON) then
begin
p1:=comp_expr(true);
p2:=ccallparanode.create(p1,p2);
include(tcallparanode(p2).callparaflags,cpf_is_colon_para);
end
end;
until not try_to_consume(_COMMA);
allow_array_constructor:=old_allow_array_constructor;
dec(parsing_para_level);
in_args:=prev_in_args;
named_args_allowed:=old_named_args_allowed;
parse_paras:=p2;
end;
function gen_c_style_operator(ntyp:tnodetype;p1,p2:tnode) : tnode;
var
hp : tnode;
hdef : tdef;
temp : ttempcreatenode;
newstatement : tstatementnode;
begin
{ Properties are not allowed, because the write can
be different from the read }
if (nf_isproperty in p1.flags) then
begin
Message(type_e_variable_id_expected);
{ We can continue with the loading,
it'll not create errors. Only the expected
result can be wrong }
end;
hp:=p1;
while assigned(hp) and
(hp.nodetype in [derefn,subscriptn,vecn,typeconvn]) do
hp:=tunarynode(hp).left;
if not assigned(hp) then
internalerror(200410121);
if (hp.nodetype=calln) then
begin
typecheckpass(p1);
result:=internalstatements(newstatement);
hdef:=tpointerdef.create(p1.resultdef);
temp:=ctempcreatenode.create(hdef,sizeof(aint),tt_persistent,false);
addstatement(newstatement,temp);
addstatement(newstatement,cassignmentnode.create(ctemprefnode.create(temp),caddrnode.create_internal(p1)));
addstatement(newstatement,cassignmentnode.create(
cderefnode.create(ctemprefnode.create(temp)),
caddnode.create(ntyp,
cderefnode.create(ctemprefnode.create(temp)),
p2)));
addstatement(newstatement,ctempdeletenode.create(temp));
end
else
result:=cassignmentnode.create(p1,caddnode.create(ntyp,p1.getcopy,p2));
end;
function statement_syssym(l : byte) : tnode;
var
p1,p2,paras : tnode;
err,
prev_in_args : boolean;
begin
prev_in_args:=in_args;
case l of
in_new_x :
begin
if afterassignment or in_args then
statement_syssym:=new_function
else
statement_syssym:=new_dispose_statement(true);
end;
in_dispose_x :
begin
statement_syssym:=new_dispose_statement(false);
end;
in_ord_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=geninlinenode(in_ord_x,false,p1);
statement_syssym := p1;
end;
in_exit :
begin
if try_to_consume(_LKLAMMER) then
begin
if not (m_mac in current_settings.modeswitches) then
begin
if not(try_to_consume(_RKLAMMER)) then
begin
p1:=comp_expr(true);
consume(_RKLAMMER);
if (block_type=bt_except) then
begin
Message(parser_e_exit_with_argument_not__possible);
{ recovery }
p1.free;
p1:=nil;
end
else if (not assigned(current_procinfo) or
is_void(current_procinfo.procdef.returndef)) then
begin
Message(parser_e_void_function);
{ recovery }
p1.free;
p1:=nil;
end;
end
else
p1:=nil;
end
else
begin
if not (current_procinfo.procdef.procsym.name = pattern) then
Message(parser_e_macpas_exit_wrong_param);
consume(_ID);
consume(_RKLAMMER);
p1:=nil;
end
end
else
p1:=nil;
statement_syssym:=cexitnode.create(p1);
end;
in_break :
begin
statement_syssym:=cbreaknode.create
end;
in_continue :
begin
statement_syssym:=ccontinuenode.create
end;
in_leave :
begin
if m_mac in current_settings.modeswitches then
statement_syssym:=cbreaknode.create
else
begin
Message1(sym_e_id_not_found, orgpattern);
statement_syssym:=cerrornode.create;
end;
end;
in_cycle :
begin
if m_mac in current_settings.modeswitches then
statement_syssym:=ccontinuenode.create
else
begin
Message1(sym_e_id_not_found, orgpattern);
statement_syssym:=cerrornode.create;
end;
end;
in_typeof_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
consume(_RKLAMMER);
if p1.nodetype=typen then
ttypenode(p1).allowed:=true;
{ Allow classrefdef, which is required for
Typeof(self) in static class methods }
if (p1.resultdef.typ = objectdef) or
(assigned(current_procinfo) and
((po_classmethod in current_procinfo.procdef.procoptions) or
(po_staticmethod in current_procinfo.procdef.procoptions)) and
(p1.resultdef.typ=classrefdef)) then
statement_syssym:=geninlinenode(in_typeof_x,false,p1)
else
begin
Message(parser_e_class_id_expected);
p1.destroy;
statement_syssym:=cerrornode.create;
end;
end;
in_sizeof_x,
in_bitsizeof_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
consume(_RKLAMMER);
if (p1.nodetype<>typen) and
(
(is_object(p1.resultdef) and
(oo_has_constructor in tobjectdef(p1.resultdef).objectoptions)) or
is_open_array(p1.resultdef) or
is_array_of_const(p1.resultdef) or
is_open_string(p1.resultdef)
) then
begin
statement_syssym:=geninlinenode(in_sizeof_x,false,p1);
{ no packed bit support for these things }
if (l = in_bitsizeof_x) then
statement_syssym:=caddnode.create(muln,statement_syssym,cordconstnode.create(8,sinttype,true));
end
else
begin
if (l = in_sizeof_x) or
(not((p1.nodetype = vecn) and
is_packed_array(tvecnode(p1).left.resultdef)) and
not((p1.nodetype = subscriptn) and
is_packed_record_or_object(tsubscriptnode(p1).left.resultdef))) then
begin
statement_syssym:=cordconstnode.create(p1.resultdef.size,sinttype,true);
if (l = in_bitsizeof_x) then
statement_syssym:=caddnode.create(muln,statement_syssym,cordconstnode.create(8,sinttype,true));
end
else
statement_syssym:=cordconstnode.create(p1.resultdef.packedbitsize,sinttype,true);
{ p1 not needed !}
p1.destroy;
end;
end;
in_typeinfo_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
{ When reading a class type it is parsed as loadvmtaddrn,
typeinfo only needs the type so we remove the loadvmtaddrn }
if p1.nodetype=loadvmtaddrn then
begin
p2:=tloadvmtaddrnode(p1).left;
tloadvmtaddrnode(p1).left:=nil;
p1.free;
p1:=p2;
end;
if p1.nodetype=typen then
ttypenode(p1).allowed:=true
else
begin
p1.destroy;
p1:=cerrornode.create;
Message(parser_e_illegal_parameter_list);
end;
consume(_RKLAMMER);
p2:=geninlinenode(in_typeinfo_x,false,p1);
statement_syssym:=p2;
end;
{$ifdef SUPPORT_UNALIGNED}
in_unaligned_x :
begin
err:=false;
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p2:=ccallparanode.create(p1,nil);
p2:=geninlinenode(in_unaligned_x,false,p2);
consume(_RKLAMMER);
statement_syssym:=p2;
end;
{$endif SUPPORT_UNALIGNED}
in_assigned_x :
begin
err:=false;
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
{ When reading a class type it is parsed as loadvmtaddrn,
typeinfo only needs the type so we remove the loadvmtaddrn }
if p1.nodetype=loadvmtaddrn then
begin
p2:=tloadvmtaddrnode(p1).left;
tloadvmtaddrnode(p1).left:=nil;
p1.free;
p1:=p2;
end;
if not codegenerror then
begin
case p1.resultdef.typ of
procdef, { procvar }
pointerdef,
procvardef,
classrefdef : ;
objectdef :
if not is_class_or_interface(p1.resultdef) then
begin
Message(parser_e_illegal_parameter_list);
err:=true;
end;
arraydef :
if not is_dynamic_array(p1.resultdef) then
begin
Message(parser_e_illegal_parameter_list);
err:=true;
end;
else
begin
Message(parser_e_illegal_parameter_list);
err:=true;
end;
end;
end
else
err:=true;
if not err then
begin
p2:=ccallparanode.create(p1,nil);
p2:=geninlinenode(in_assigned_x,false,p2);
end
else
begin
p1.free;
p2:=cerrornode.create;
end;
consume(_RKLAMMER);
statement_syssym:=p2;
end;
in_addr_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p1:=caddrnode.create(p1);
if cs_typed_addresses in current_settings.localswitches then
include(p1.flags,nf_typedaddr);
consume(_RKLAMMER);
statement_syssym:=p1;
end;
in_ofs_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p1:=caddrnode.create(p1);
do_typecheckpass(p1);
{ Ofs() returns a cardinal/qword, not a pointer }
p1.resultdef:=uinttype;
consume(_RKLAMMER);
statement_syssym:=p1;
end;
in_seg_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p1:=geninlinenode(in_seg_x,false,p1);
consume(_RKLAMMER);
statement_syssym:=p1;
end;
in_high_x,
in_low_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p2:=geninlinenode(l,false,p1);
consume(_RKLAMMER);
statement_syssym:=p2;
end;
in_succ_x,
in_pred_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p2:=geninlinenode(l,false,p1);
consume(_RKLAMMER);
statement_syssym:=p2;
end;
in_inc_x,
in_dec_x :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
if try_to_consume(_COMMA) then
p2:=ccallparanode.create(comp_expr(true),nil)
else
p2:=nil;
p2:=ccallparanode.create(p1,p2);
statement_syssym:=geninlinenode(l,false,p2);
consume(_RKLAMMER);
end;
in_slice_x:
begin
if not(in_args) then
begin
message(parser_e_illegal_slice);
consume(_LKLAMMER);
in_args:=true;
comp_expr(true).free;
if try_to_consume(_COMMA) then
comp_expr(true).free;
statement_syssym:=cerrornode.create;
consume(_RKLAMMER);
end
else
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
Consume(_COMMA);
if not(codegenerror) then
p2:=ccallparanode.create(comp_expr(true),nil)
else
p2:=cerrornode.create;
p2:=ccallparanode.create(p1,p2);
statement_syssym:=geninlinenode(l,false,p2);
consume(_RKLAMMER);
end;
end;
in_initialize_x:
begin
statement_syssym:=inline_initialize;
end;
in_finalize_x:
begin
statement_syssym:=inline_finalize;
end;
in_copy_x:
begin
statement_syssym:=inline_copy;
end;
in_concat_x :
begin
consume(_LKLAMMER);
in_args:=true;
{ Translate to x:=x+y[+z]. The addnode will do the
type checking }
p2:=nil;
repeat
p1:=comp_expr(true);
if p2<>nil then
p2:=caddnode.create(addn,p2,p1)
else
begin
{ Force string type if it isn't yet }
if not(
(p1.resultdef.typ=stringdef) or
is_chararray(p1.resultdef) or
is_char(p1.resultdef)
) then
inserttypeconv(p1,cshortstringtype);
p2:=p1;
end;
until not try_to_consume(_COMMA);
consume(_RKLAMMER);
statement_syssym:=p2;
end;
in_read_x,
in_readln_x :
begin
if try_to_consume(_LKLAMMER) then
begin
paras:=parse_paras(false,false,_RKLAMMER);
consume(_RKLAMMER);
end
else
paras:=nil;
p1:=geninlinenode(l,false,paras);
statement_syssym := p1;
end;
in_setlength_x:
begin
statement_syssym := inline_setlength;
end;
in_length_x:
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
p2:=geninlinenode(l,false,p1);
consume(_RKLAMMER);
statement_syssym:=p2;
end;
in_write_x,
in_writeln_x :
begin
if try_to_consume(_LKLAMMER) then
begin
paras:=parse_paras(true,false,_RKLAMMER);
consume(_RKLAMMER);
end
else
paras:=nil;
p1 := geninlinenode(l,false,paras);
statement_syssym := p1;
end;
in_str_x_string :
begin
consume(_LKLAMMER);
paras:=parse_paras(true,false,_RKLAMMER);
consume(_RKLAMMER);
p1 := geninlinenode(l,false,paras);
statement_syssym := p1;
end;
in_val_x:
Begin
consume(_LKLAMMER);
in_args := true;
p1:= ccallparanode.create(comp_expr(true), nil);
consume(_COMMA);
p2 := ccallparanode.create(comp_expr(true),p1);
if try_to_consume(_COMMA) then
p2 := ccallparanode.create(comp_expr(true),p2);
consume(_RKLAMMER);
p2 := geninlinenode(l,false,p2);
statement_syssym := p2;
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,ccallparanode.create(p1,ccallparanode.create(p2,nil)));
consume(_RKLAMMER);
end;
in_pack_x_y_z,
in_unpack_x_y_z :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
consume(_COMMA);
p2:=comp_expr(true);
consume(_COMMA);
paras:=comp_expr(true);
statement_syssym:=geninlinenode(l,false,ccallparanode.create(p1,ccallparanode.create(p2,ccallparanode.create(paras,nil))));
consume(_RKLAMMER);
end;
in_assert_x_y :
begin
consume(_LKLAMMER);
in_args:=true;
p1:=comp_expr(true);
if try_to_consume(_COMMA) then
p2:=comp_expr(true)
else
begin
{ then insert an empty string }
p2:=cstringconstnode.createstr('');
end;
statement_syssym:=geninlinenode(l,false,ccallparanode.create(p1,ccallparanode.create(p2,nil)));
consume(_RKLAMMER);
end;
in_get_frame:
begin
statement_syssym:=geninlinenode(l,false,nil);
end;
(*
in_get_caller_frame:
begin
if try_to_consume(_LKLAMMER) then
begin
{You used to call get_caller_frame as get_caller_frame(get_frame),
however, as a stack frame may not exist, it does more harm than
good, so ignore it.}
in_args:=true;
p1:=comp_expr(true);
p1.destroy;
consume(_RKLAMMER);
end;
statement_syssym:=geninlinenode(l,false,nil);
end;
*)
else
internalerror(15);
end;
in_args:=prev_in_args;
end;
function maybe_load_methodpointer(st:TSymtable;var p1:tnode):boolean;
begin
maybe_load_methodpointer:=false;
if not assigned(p1) then
begin
case st.symtabletype of
withsymtable :
begin
if (st.defowner.typ=objectdef) then
p1:=tnode(twithsymtable(st).withrefnode).getcopy;
end;
ObjectSymtable :
begin
p1:=load_self_node;
{ We are calling a member }
maybe_load_methodpointer:=true;
end;
end;
end;
end;
{ reads the parameter for a subroutine call }
procedure do_proc_call(sym:tsym;st:TSymtable;obj:tobjectdef;getaddr:boolean;var again : boolean;var p1:tnode;callflags:tcallnodeflags);
var
membercall,
prevafterassn : boolean;
i : integer;
para,p2 : tnode;
currpara : tparavarsym;
aprocdef : tprocdef;
begin
prevafterassn:=afterassignment;
afterassignment:=false;
membercall:=false;
aprocdef:=nil;
{ when it is a call to a member we need to load the
methodpointer first }
membercall:=maybe_load_methodpointer(st,p1);
{ When we are expecting a procvar we also need
to get the address in some cases }
if assigned(getprocvardef) then
begin
if (block_type=bt_const) or
getaddr then
begin
aprocdef:=Tprocsym(sym).Find_procdef_byprocvardef(getprocvardef);
getaddr:=true;
end
else
if (m_tp_procvar in current_settings.modeswitches) or
(m_mac_procvar in current_settings.modeswitches) then
begin
aprocdef:=Tprocsym(sym).Find_procdef_byprocvardef(getprocvardef);
if assigned(aprocdef) then
getaddr:=true;
end;
end;
{ only need to get the address of the procedure? }
if getaddr then
begin
{ Retrieve info which procvar to call. For tp_procvar the
aprocdef is already loaded above so we can reuse it }
if not assigned(aprocdef) and
assigned(getprocvardef) then
aprocdef:=Tprocsym(sym).Find_procdef_byprocvardef(getprocvardef);
{ generate a methodcallnode or proccallnode }
{ we shouldn't convert things like @tcollection.load }
p2:=cloadnode.create_procvar(sym,aprocdef,st);
if assigned(p1) then
begin
{ for loading methodpointer of an inherited function
we use self as instance and load the address of
the function directly and not through the vmt (PFV) }
if (cnf_inherited in callflags) then
begin
include(p2.flags,nf_inherited);
p1.free;
p1:=load_self_node;
end;
if (p1.nodetype<>typen) then
tloadnode(p2).set_mp(p1)
else
p1.free;
end;
p1:=p2;
{ no postfix operators }
again:=false;
end
else
begin
para:=nil;
if anon_inherited then
begin
if not assigned(current_procinfo) then
internalerror(200305054);
for i:=0 to current_procinfo.procdef.paras.count-1 do
begin
currpara:=tparavarsym(current_procinfo.procdef.paras[i]);
if not(vo_is_hidden_para in currpara.varoptions) then
begin
{ inheritance by msgint? }
if assigned(srdef) then
{ anonymous inherited via msgid calls only require a var parameter for
both methods, so we need some type casting here }
para:=ccallparanode.create(ctypeconvnode.create_internal(ctypeconvnode.create_internal(
cloadnode.create(currpara,currpara.owner),cformaltype),tparavarsym(tprocdef(srdef).paras[i]).vardef),
para)
else
para:=ccallparanode.create(cloadnode.create(currpara,currpara.owner),para);
end;
end;
end
else
begin
if try_to_consume(_LKLAMMER) then
begin
para:=parse_paras(false,false,_RKLAMMER);
consume(_RKLAMMER);
end;
end;
{ indicate if this call was generated by a member and
no explicit self is used, this is needed to determine
how to handle a destructor call (PFV) }
if membercall then
include(callflags,cnf_member_call);
if assigned(obj) then
begin
if (st.symtabletype<>ObjectSymtable) then
internalerror(200310031);
p1:=ccallnode.create(para,tprocsym(sym),obj.symtable,p1,callflags);
end
else
p1:=ccallnode.create(para,tprocsym(sym),st,p1,callflags);
end;
afterassignment:=prevafterassn;
end;
procedure handle_procvar(pv : tprocvardef;var p2 : tnode);
var
hp,hp2 : tnode;
hpp : ^tnode;
currprocdef : tprocdef;
begin
if not assigned(pv) then
internalerror(200301121);
if (m_tp_procvar in current_settings.modeswitches) or
(m_mac_procvar in current_settings.modeswitches) then
begin
hp:=p2;
hpp:=@p2;
while assigned(hp) and
(hp.nodetype=typeconvn) do
begin
hp:=ttypeconvnode(hp).left;
{ save orignal address of the old tree so we can replace the node }
hpp:=@hp;
end;
if (hp.nodetype=calln) and
{ a procvar can't have parameters! }
not assigned(tcallnode(hp).left) then
begin
currprocdef:=tcallnode(hp).symtableprocentry.Find_procdef_byprocvardef(pv);
if assigned(currprocdef) then
begin
hp2:=cloadnode.create_procvar(tprocsym(tcallnode(hp).symtableprocentry),currprocdef,tcallnode(hp).symtableproc);
if (po_methodpointer in pv.procoptions) then
tloadnode(hp2).set_mp(tcallnode(hp).get_load_methodpointer);
hp.destroy;
{ replace the old callnode with the new loadnode }
hpp^:=hp2;
end;
end;
end;
end;
{ the following procedure handles the access to a property symbol }
procedure handle_propertysym(propsym : tpropertysym;st : TSymtable;var p1 : tnode);
var
paras : tnode;
p2 : tnode;
membercall : boolean;
callflags : tcallnodeflags;
propaccesslist : tpropaccesslist;
function getpropaccesslist(pap:tpropaccesslisttypes):boolean;
var
hpropsym : tpropertysym;
begin
result:=false;
{ find property in the overriden list }
hpropsym:=propsym;
repeat
propaccesslist:=hpropsym.propaccesslist[pap];
if not propaccesslist.empty then
begin
result:=true;
exit;
end;
hpropsym:=hpropsym.overridenpropsym;
until not assigned(hpropsym);
end;
begin
{ property parameters? read them only if the property really }
{ has parameters }
paras:=nil;
if (ppo_hasparameters in propsym.propoptions) then
begin
if try_to_consume(_LECKKLAMMER) then
begin
paras:=parse_paras(false,false,_RECKKLAMMER);
consume(_RECKKLAMMER);
end;
end;
{ indexed property }
if (ppo_indexed in propsym.propoptions) then
begin
p2:=cordconstnode.create(propsym.index,propsym.indexdef,true);
paras:=ccallparanode.create(p2,paras);
end;
{ we need only a write property if a := follows }
{ if not(afterassignment) and not(in_args) then }
if token=_ASSIGNMENT then
begin
if getpropaccesslist(palt_write) then
begin
case propaccesslist.firstsym^.sym.typ of
procsym :
begin
callflags:=[];
{ generate the method call }
membercall:=maybe_load_methodpointer(st,p1);
if membercall then
include(callflags,cnf_member_call);
p1:=ccallnode.create(paras,tprocsym(propaccesslist.firstsym^.sym),st,p1,callflags);
addsymref(propaccesslist.firstsym^.sym);
paras:=nil;
consume(_ASSIGNMENT);
{ read the expression }
if propsym.propdef.typ=procvardef then
getprocvardef:=tprocvardef(propsym.propdef);
p2:=comp_expr(true);
if assigned(getprocvardef) then
handle_procvar(getprocvardef,p2);
tcallnode(p1).left:=ccallparanode.create(p2,tcallnode(p1).left);
{ mark as property, both the tcallnode and the real call block }
include(p1.flags,nf_isproperty);
getprocvardef:=nil;
end;
fieldvarsym :
begin
{ generate access code }
propaccesslist_to_node(p1,st,propaccesslist);
include(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
if getpropaccesslist(palt_read) then
begin
case propaccesslist.firstsym^.sym.typ of
fieldvarsym :
begin
{ generate access code }
propaccesslist_to_node(p1,st,propaccesslist);
include(p1.flags,nf_isproperty);
end;
procsym :
begin
callflags:=[];
{ generate the method call }
membercall:=maybe_load_methodpointer(st,p1);
if membercall then
include(callflags,cnf_member_call);
p1:=ccallnode.create(paras,tprocsym(propaccesslist.firstsym^.sym),st,p1,callflags);
paras:=nil;
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;
{ release paras if not used }
if assigned(paras) then
paras.free;
end;
{ the ID token has to be consumed before calling this function }
procedure do_member_read(classh:tobjectdef;getaddr : boolean;sym : tsym;var p1 : tnode;var again : boolean;callflags:tcallnodeflags);
var
static_name : string;
isclassref : boolean;
srsymtable : TSymtable;
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,orgpattern);
p1.free;
p1:=cerrornode.create;
{ try to clean up }
again:=false;
end
else
begin
if assigned(p1) then
begin
if not assigned(p1.resultdef) then
do_typecheckpass(p1);
isclassref:=(p1.resultdef.typ=classrefdef);
end
else
isclassref:=false;
{ we assume, that only procsyms and varsyms are in an object }
{ symbol table, for classes, properties are allowed }
case sym.typ of
procsym:
begin
do_proc_call(sym,sym.owner,classh,
(getaddr and not(token in [_CARET,_POINT])),
again,p1,callflags);
{ we need to know which procedure is called }
do_typecheckpass(p1);
{ calling using classref? }
if isclassref and
(p1.nodetype=calln) 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;
fieldvarsym:
begin
if (sp_static in sym.symoptions) then
begin
static_name:=lower(sym.owner.name^)+'_'+sym.name;
searchsym(static_name,sym,srsymtable);
if assigned(sym) then
check_hints(sym,sym.symoptions);
p1.free;
p1:=cloadnode.create(sym,srsymtable);
end
else
begin
if isclassref then
if assigned(p1) and
is_self_node(p1) then
Message(parser_e_only_class_methods)
else
Message(parser_e_only_class_methods_via_class_ref);
p1:=csubscriptnode.create(sym,p1);
end;
end;
propertysym:
begin
if isclassref then
Message(parser_e_only_class_methods_via_class_ref);
handle_propertysym(tpropertysym(sym),sym.owner,p1);
end;
typesym:
begin
p1:=ctypenode.create(ttypesym(sym).typedef);
end;
else internalerror(16);
end;
end;
end;
{****************************************************************************
Factor
****************************************************************************}
function is_member_read(sym: tsym; st: tsymtable; var p1: tnode;
out memberparentdef: tdef): boolean;
var
hdef : tdef;
begin
result:=true;
memberparentdef:=nil;
case st.symtabletype of
ObjectSymtable:
begin
memberparentdef:=tdef(st.defowner);
exit;
end;
WithSymtable:
begin
if assigned(p1) then
internalerror(2007012002);
hdef:=tnode(twithsymtable(st).withrefnode).resultdef;
p1:=tnode(twithsymtable(st).withrefnode).getcopy;
if not(hdef.typ in [objectdef,classrefdef]) then
exit;
if (hdef.typ=classrefdef) then
hdef:=tclassrefdef(hdef).pointeddef;
memberparentdef:=hdef;
end;
else
result:=false;
end;
end;
{$maxfpuregisters 0}
function factor(getaddr : boolean) : tnode;
{---------------------------------------------
Factor_read_id
---------------------------------------------}
procedure factor_read_id(var p1:tnode;var again:boolean);
var
pc : pchar;
len : longint;
srsym : tsym;
unit_found,
possible_error : boolean;
srsymtable : TSymtable;
hdef : tdef;
static_name : string;
orgstoredpattern,
storedpattern : string;
begin
{ allow post fix operators }
again:=true;
{ first check for identifier }
if token<>_ID then
begin
srsym:=generrorsym;
srsymtable:=nil;
consume(_ID);
end
else
begin
searchsym(pattern,srsym,srsymtable);
{ handle unit specification like System.Writeln }
unit_found:=try_consume_unitsym(srsym,srsymtable);
storedpattern:=pattern;
orgstoredpattern:=orgpattern;
consume(_ID);
{ named parameter support }
found_arg_name:=false;
if not(unit_found) and
named_args_allowed and
(token=_ASSIGNMENT) then
begin
found_arg_name:=true;
p1:=cstringconstnode.createstr(storedpattern);
consume(_ASSIGNMENT);
exit;
end;
{ if nothing found give error and return errorsym }
if assigned(srsym) then
check_hints(srsym,srsym.symoptions)
else
begin
identifier_not_found(orgstoredpattern);
srsym:=generrorsym;
srsymtable:=nil;
end;
end;
{ Access to funcret or need to call the function? }
if (srsym.typ in [absolutevarsym,localvarsym,paravarsym]) and
(vo_is_funcret in tabstractvarsym(srsym).varoptions) and
(
(token=_LKLAMMER) or
(
(
(m_tp7 in current_settings.modeswitches) or
(m_delphi in current_settings.modeswitches)
) and
(afterassignment or in_args) and
not(vo_is_result in tabstractvarsym(srsym).varoptions)
)
) then
begin
hdef:=tdef(srsym.owner.defowner);
if assigned(hdef) and
(hdef.typ=procdef) then
srsym:=tprocdef(hdef).procsym
else
begin
Message(parser_e_illegal_expression);
srsym:=generrorsym;
end;
srsymtable:=srsym.owner;
end;
begin
case srsym.typ of
absolutevarsym :
begin
if (tabsolutevarsym(srsym).abstyp=tovar) then
begin
p1:=nil;
propaccesslist_to_node(p1,nil,tabsolutevarsym(srsym).ref);
p1:=ctypeconvnode.create(p1,tabsolutevarsym(srsym).vardef);
include(p1.flags,nf_absolute);
end
else
p1:=cloadnode.create(srsym,srsymtable);
end;
staticvarsym,
localvarsym,
paravarsym,
fieldvarsym :
begin
{ check if we are reading a field of an object/class/ }
{ record. is_member_read() will deal with withsymtables }
{ if needed. }
if is_member_read(srsym,srsymtable,p1,hdef) then
begin
{ if the field was originally found in an }
{ objectsymtable, it means it's part of self }
if (srsymtable.symtabletype=ObjectSymtable) then
p1:=load_self_node;
{ now, if the field itself is part of an objectsymtab }
{ (it can be even if it was found in a withsymtable, }
{ e.g., "with classinstance do field := 5"), then }
{ let do_member_read handle it }
if (srsym.owner.symtabletype=ObjectSymtable) then
do_member_read(tobjectdef(hdef),getaddr,srsym,p1,again,[])
else
{ otherwise it's a regular record subscript }
p1:=csubscriptnode.create(srsym,p1);
end
else
{ regular non-field load }
p1:=cloadnode.create(srsym,srsymtable);
end;
syssym :
begin
p1:=statement_syssym(tsyssym(srsym).number);
end;
typesym :
begin
hdef:=ttypesym(srsym).typedef;
if not assigned(hdef) then
begin
again:=false;
end
else
begin
{ We need to know if this unit uses Variants }
if (hdef=cvarianttype) and
not(cs_compilesystem in current_settings.moduleswitches) then
current_module.flags:=current_module.flags or uf_uses_variants;
if (block_type<>bt_specialize) and
try_to_consume(_LKLAMMER) then
begin
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=ctypeconvnode.create_explicit(p1,hdef);
end
else { not LKLAMMER }
if (token=_POINT) and
is_object(hdef) then
begin
consume(_POINT);
if assigned(current_procinfo) and
assigned(current_procinfo.procdef._class) and
not(getaddr) then
begin
if current_procinfo.procdef._class.is_related(tobjectdef(hdef)) then
begin
p1:=ctypenode.create(hdef);
{ search also in inherited methods }
searchsym_in_class(tobjectdef(hdef),current_procinfo.procdef._class,pattern,srsym,srsymtable);
if assigned(srsym) then
check_hints(srsym,srsym.symoptions);
consume(_ID);
do_member_read(tobjectdef(hdef),false,srsym,p1,again,[]);
end
else
begin
Message(parser_e_no_super_class);
again:=false;
end;
end
else
begin
{ allows @TObject.Load }
{ also allows static methods and variables }
p1:=ctypenode.create(hdef);
{ TP allows also @TMenu.Load if Load is only }
{ defined in an anchestor class }
srsym:=search_class_member(tobjectdef(hdef),pattern);
if assigned(srsym) then
begin
check_hints(srsym,srsym.symoptions);
if not(getaddr) and not(sp_static in srsym.symoptions) then
Message(sym_e_only_static_in_static)
else
begin
consume(_ID);
do_member_read(tobjectdef(hdef),getaddr,srsym,p1,again,[]);
end;
end
else
Message1(sym_e_id_no_member,orgpattern);
end;
end
else
begin
{ class reference ? }
if is_class(hdef) then
begin
if getaddr and (token=_POINT) then
begin
consume(_POINT);
{ allows @Object.Method }
{ also allows static methods and variables }
p1:=ctypenode.create(hdef);
{ TP allows also @TMenu.Load if Load is only }
{ defined in an anchestor class }
srsym:=search_class_member(tobjectdef(hdef),pattern);
if assigned(srsym) then
begin
check_hints(srsym,srsym.symoptions);
consume(_ID);
do_member_read(tobjectdef(hdef),getaddr,srsym,p1,again,[]);
end
else
begin
Message1(sym_e_id_no_member,orgpattern);
consume(_ID);
end;
end
else
begin
p1:=ctypenode.create(hdef);
{ For a type block we simply return only
the type. For all other blocks we return
a loadvmt node }
if not(block_type in [bt_type,bt_specialize]) then
p1:=cloadvmtaddrnode.create(p1);
end;
end
else
p1:=ctypenode.create(hdef);
end;
end;
end;
enumsym :
begin
p1:=genenumnode(tenumsym(srsym));
end;
constsym :
begin
case tconstsym(srsym).consttyp of
constord :
begin
if tconstsym(srsym).constdef=nil then
internalerror(200403232);
p1:=cordconstnode.create(tconstsym(srsym).value.valueord,tconstsym(srsym).constdef,true);
end;
conststring :
begin
len:=tconstsym(srsym).value.len;
if not(cs_ansistrings in current_settings.localswitches) and (len>255) then
len:=255;
getmem(pc,len+1);
move(pchar(tconstsym(srsym).value.valueptr)^,pc^,len);
pc[len]:=#0;
p1:=cstringconstnode.createpchar(pc,len);
end;
constwstring :
p1:=cstringconstnode.createwstr(pcompilerwidestring(tconstsym(srsym).value.valueptr));
constreal :
p1:=crealconstnode.create(pbestreal(tconstsym(srsym).value.valueptr)^,pbestrealtype^);
constset :
p1:=csetconstnode.create(pconstset(tconstsym(srsym).value.valueptr),tconstsym(srsym).constdef);
constpointer :
p1:=cpointerconstnode.create(tconstsym(srsym).value.valueordptr,tconstsym(srsym).constdef);
constnil :
p1:=cnilnode.create;
constresourcestring:
begin
p1:=cloadnode.create(srsym,srsymtable);
do_typecheckpass(p1);
p1.resultdef:=cansistringtype;
end;
constguid :
p1:=cguidconstnode.create(pguid(tconstsym(srsym).value.valueptr)^);
else
internalerror(200507181);
end;
end;
procsym :
begin
{ check if it's a method/class method }
if is_member_read(srsym,srsymtable,p1,hdef) then
begin
{ not srsymtable.symtabletype since that can be }
{ withsymtable as well }
if (srsym.owner.symtabletype=ObjectSymtable) then
do_member_read(tobjectdef(hdef),getaddr,srsym,p1,again,[])
else
{ no procsyms in records (yet) }
internalerror(2007012006);
end
else
{ regular procedure/function call }
do_proc_call(srsym,srsymtable,nil,
(getaddr and not(token in [_CARET,_POINT])),
again,p1,[]);
end;
propertysym :
begin
{ property of a class/object? }
if is_member_read(srsym,srsymtable,p1,hdef) then
begin
{ not srsymtable.symtabletype since that can be }
{ withsymtable as well }
if (srsym.owner.symtabletype=ObjectSymtable) then
do_member_read(tobjectdef(hdef),getaddr,srsym,p1,again,[])
else
{ no propertysyms in records (yet) }
internalerror(2007012006);
end
else
{ no method pointer }
begin
p1:=nil;
handle_propertysym(tpropertysym(srsym),srsymtable,p1);
end;
end;
labelsym :
begin
{ Support @label }
if getaddr then
begin
if srsym.owner<>current_procinfo.procdef.localst then
CGMessage(parser_e_label_outside_proc);
p1:=cloadnode.create(srsym,srsym.owner)
end
else
begin
consume(_COLON);
if tlabelsym(srsym).defined then
Message(sym_e_label_already_defined);
tlabelsym(srsym).defined:=true;
p1:=clabelnode.create(nil);
tlabelsym(srsym).code:=p1;
end;
end;
errorsym :
begin
p1:=cerrornode.create;
if try_to_consume(_LKLAMMER) then
begin
parse_paras(false,false,_RKLAMMER);
consume(_RKLAMMER);
end;
end;
else
begin
p1:=cerrornode.create;
Message(parser_e_illegal_expression);
end;
end; { end case }
end;
end;
{---------------------------------------------
Factor_Read_Set
---------------------------------------------}
{ Read a set between [] }
function factor_read_set:tnode;
var
p1,p2 : 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
repeat
p1:=comp_expr(true);
if try_to_consume(_POINTPOINT) then
begin
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 }
until not try_to_consume(_COMMA);
factor_read_set:=buildp;
end;
{---------------------------------------------
PostFixOperators
---------------------------------------------}
procedure postfixoperators(var p1:tnode;var again:boolean);
{ tries to avoid syntax errors after invalid qualifiers }
procedure recoverconsume_postfixops;
begin
repeat
if not try_to_consume(_CARET) then
if try_to_consume(_POINT) then
try_to_consume(_ID)
else if try_to_consume(_LECKKLAMMER) then
begin
repeat
comp_expr(true);
until not try_to_consume(_COMMA);
consume(_RECKKLAMMER);
end
else
break;
until false;
end;
procedure handle_variantarray;
var
p4 : tnode;
newstatement : tstatementnode;
tempresultvariant,
temp : ttempcreatenode;
paras : tcallparanode;
newblock : tnode;
countindices : aint;
begin
{ create statements with call initialize the arguments and
call fpc_dynarr_setlength }
newblock:=internalstatements(newstatement);
{ get temp for array of indicies,
we set the real size later }
temp:=ctempcreatenode.create(s32inttype,4,tt_persistent,false);
addstatement(newstatement,temp);
countindices:=0;
repeat
p4:=comp_expr(true);
addstatement(newstatement,cassignmentnode.create(
ctemprefnode.create_offset(temp,countindices*s32inttype.size),p4));
inc(countindices);
until not try_to_consume(_COMMA);
{ set real size }
temp.size:=countindices*s32inttype.size;
consume(_RECKKLAMMER);
{ we need only a write access if a := follows }
if token=_ASSIGNMENT then
begin
consume(_ASSIGNMENT);
p4:=comp_expr(true);
{ create call to fpc_vararray_put }
paras:=ccallparanode.create(cordconstnode.create
(countindices,s32inttype,true),
ccallparanode.create(caddrnode.create_internal
(ctemprefnode.create(temp)),
ccallparanode.create(ctypeconvnode.create_internal(p4,cvarianttype),
ccallparanode.create(p1
,nil))));
addstatement(newstatement,ccallnode.createintern('fpc_vararray_put',paras));
addstatement(newstatement,ctempdeletenode.create(temp));
end
else
begin
{ create temp for result }
tempresultvariant:=ctempcreatenode.create(cvarianttype,cvarianttype.size,tt_persistent,true);
addstatement(newstatement,tempresultvariant);
{ create call to fpc_vararray_get }
paras:=ccallparanode.create(cordconstnode.create
(countindices,s32inttype,true),
ccallparanode.create(caddrnode.create_internal
(ctemprefnode.create(temp)),
ccallparanode.create(p1,
ccallparanode.create(
ctemprefnode.create(tempresultvariant)
,nil))));
addstatement(newstatement,ccallnode.createintern('fpc_vararray_get',paras));
addstatement(newstatement,ctempdeletenode.create(temp));
{ the last statement should return the value as
location and type, this is done be referencing the
temp and converting it first from a persistent temp to
normal temp }
addstatement(newstatement,ctempdeletenode.create_normal_temp(tempresultvariant));
addstatement(newstatement,ctemprefnode.create(tempresultvariant));
end;
p1:=newblock;
end;
var
protsym : tpropertysym;
p2,p3 : tnode;
srsym : tsym;
srsymtable : TSymtable;
classh : tobjectdef;
{ shouldn't be used that often, so the extra overhead is ok to save
stack space }
dispatchstring : ansistring;
label
skipreckklammercheck;
begin
again:=true;
while again do
begin
{ we need the resultdef }
do_typecheckpass(p1);
if codegenerror then
begin
recoverconsume_postfixops;
exit;
end;
{ handle token }
case token of
_CARET:
begin
consume(_CARET);
{ support tp/mac procvar^ if the procvar returns a
pointer type }
if ((m_tp_procvar in current_settings.modeswitches) or
(m_mac_procvar in current_settings.modeswitches)) and
(p1.resultdef.typ=procvardef) and
(tprocvardef(p1.resultdef).returndef.typ=pointerdef) then
begin
p1:=ccallnode.create_procvar(nil,p1);
typecheckpass(p1);
end;
if (p1.resultdef.typ<>pointerdef) then
begin
{ ^ as binary operator is a problem!!!! (FK) }
again:=false;
Message(parser_e_invalid_qualifier);
recoverconsume_postfixops;
p1.destroy;
p1:=cerrornode.create;
end
else
p1:=cderefnode.create(p1);
end;
_LECKKLAMMER:
begin
if is_class_or_interface(p1.resultdef) then
begin
{ default property }
protsym:=search_default_property(tobjectdef(p1.resultdef));
if not(assigned(protsym)) then
begin
p1.destroy;
p1:=cerrornode.create;
again:=false;
message(parser_e_no_default_property_available);
end
else
begin
{ The property symbol is referenced indirect }
protsym.IncRefCount;
handle_propertysym(protsym,protsym.owner,p1);
end;
end
else
begin
consume(_LECKKLAMMER);
repeat
case p1.resultdef.typ of
pointerdef:
begin
{ support delphi autoderef }
if (tpointerdef(p1.resultdef).pointeddef.typ=arraydef) and
(m_autoderef in current_settings.modeswitches) then
p1:=cderefnode.create(p1);
p2:=comp_expr(true);
{ Support Pbytevar[0..9] which returns array [0..9].}
if try_to_consume(_POINTPOINT) then
p2:=crangenode.create(p2,comp_expr(true));
p1:=cvecnode.create(p1,p2);
end;
variantdef:
begin
handle_variantarray;
{ the RECKKLAMMER is already read }
goto skipreckklammercheck;
end;
stringdef :
begin
p2:=comp_expr(true);
{ Support string[0..9] which returns array [0..9] of char.}
if try_to_consume(_POINTPOINT) then
p2:=crangenode.create(p2,comp_expr(true));
p1:=cvecnode.create(p1,p2);
end;
arraydef:
begin
p2:=comp_expr(true);
{ support SEG:OFS for go32v2 Mem[] }
if (target_info.system in [system_i386_go32v2,system_i386_watcom]) 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 try_to_consume(_COLON) then
begin
p3:=caddnode.create(muln,cordconstnode.create($10,s32inttype,false),p2);
p2:=comp_expr(true);
p2:=caddnode.create(addn,p2,p3);
if try_to_consume(_POINTPOINT) then
{ Support mem[$a000:$0000..$07ff] which returns array [0..$7ff] of memtype.}
p2:=crangenode.create(p2,caddnode.create(addn,comp_expr(true),p3.getcopy));
p1:=cvecnode.create(p1,p2);
include(tvecnode(p1).flags,nf_memseg);
include(tvecnode(p1).flags,nf_memindex);
end
else
begin
if try_to_consume(_POINTPOINT) then
{ Support mem[$80000000..$80000002] which returns array [0..2] of memtype.}
p2:=crangenode.create(p2,comp_expr(true));
p1:=cvecnode.create(p1,p2);
include(tvecnode(p1).flags,nf_memindex);
end;
end
else
begin
if try_to_consume(_POINTPOINT) then
{ Support arrayvar[0..9] which returns array [0..9] of arraytype.}
p2:=crangenode.create(p2,comp_expr(true));
p1:=cvecnode.create(p1,p2);
end;
end;
else
begin
Message(parser_e_invalid_qualifier);
p1.destroy;
p1:=cerrornode.create;
comp_expr(true);
again:=false;
end;
end;
do_typecheckpass(p1);
until not try_to_consume(_COMMA);
consume(_RECKKLAMMER);
{ handle_variantarray eats the RECKKLAMMER and jumps here }
skipreckklammercheck:
end;
end;
_POINT :
begin
consume(_POINT);
if (p1.resultdef.typ=pointerdef) and
(m_autoderef in current_settings.modeswitches) then
begin
p1:=cderefnode.create(p1);
do_typecheckpass(p1);
end;
case p1.resultdef.typ of
recorddef:
begin
if token=_ID then
begin
srsym:=tsym(trecorddef(p1.resultdef).symtable.Find(pattern));
if assigned(srsym) and
(srsym.typ=fieldvarsym) then
begin
check_hints(srsym,srsym.symoptions);
p1:=csubscriptnode.create(srsym,p1)
end
else
begin
Message1(sym_e_illegal_field,pattern);
p1.destroy;
p1:=cerrornode.create;
end;
end;
consume(_ID);
end;
variantdef:
begin
{ dispatch call? }
if token=_ID then
begin
dispatchstring:=orgpattern;
consume(_ID);
if try_to_consume(_LKLAMMER) then
begin
p2:=parse_paras(false,true,_RKLAMMER);
consume(_RKLAMMER);
end
else
p2:=nil;
p1:=translate_disp_call(p1,p2,dispatchstring);
end
else { Error }
Consume(_ID);
end;
classrefdef:
begin
if token=_ID then
begin
classh:=tobjectdef(tclassrefdef(p1.resultdef).pointeddef);
searchsym_in_class(classh,classh,pattern,srsym,srsymtable);
if assigned(srsym) then
begin
check_hints(srsym,srsym.symoptions);
consume(_ID);
do_member_read(classh,getaddr,srsym,p1,again,[]);
end
else
begin
Message1(sym_e_id_no_member,orgpattern);
p1.destroy;
p1:=cerrornode.create;
{ try to clean up }
consume(_ID);
end;
end
else { Error }
Consume(_ID);
end;
objectdef:
begin
if token=_ID then
begin
classh:=tobjectdef(p1.resultdef);
searchsym_in_class(classh,classh,pattern,srsym,srsymtable);
if assigned(srsym) then
begin
check_hints(srsym,srsym.symoptions);
consume(_ID);
do_member_read(classh,getaddr,srsym,p1,again,[]);
end
else
begin
Message1(sym_e_id_no_member,orgpattern);
p1.destroy;
p1:=cerrornode.create;
{ try to clean up }
consume(_ID);
end;
end
else { Error }
Consume(_ID);
end;
pointerdef:
begin
Message(parser_e_invalid_qualifier);
if tpointerdef(p1.resultdef).pointeddef.typ in [recorddef,objectdef,classrefdef] then
Message(parser_h_maybe_deref_caret_missing);
end;
else
begin
Message(parser_e_invalid_qualifier);
p1.destroy;
p1:=cerrornode.create;
{ Error }
consume(_ID);
end;
end;
end;
else
begin
{ is this a procedure variable ? }
if assigned(p1.resultdef) and
(p1.resultdef.typ=procvardef) then
begin
if assigned(getprocvardef) and
equal_defs(p1.resultdef,getprocvardef) then
begin
{ classes can define now types so we've to allow
type casts with these nested types as well }
if (p1.nodetype=typen) and
try_to_consume(_LKLAMMER) then
begin
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=ctypeconvnode.create_explicit(p1,p1.resultdef);
end
else
again:=false
end
else
begin
if try_to_consume(_LKLAMMER) then
begin
p2:=parse_paras(false,false,_RKLAMMER);
consume(_RKLAMMER);
p1:=ccallnode.create_procvar(p2,p1);
{ proc():= is never possible }
if token=_ASSIGNMENT then
begin
Message(parser_e_illegal_expression);
p1.free;
p1:=cerrornode.create;
again:=false;
end;
end
else
again:=false;
end;
end
else
again:=false;
end;
end;
end; { while again }
end;
{---------------------------------------------
Factor (Main)
---------------------------------------------}
var
l : longint;
ic : int64;
qc : qword;
{$ifndef cpu64}
card : cardinal;
{$endif cpu64}
oldp1,
p1 : tnode;
code : integer;
again : boolean;
srsym : tsym;
srsymtable : TSymtable;
pd : tprocdef;
hclassdef : tobjectdef;
d : bestreal;
cur : currency;
hs,hsorg : string;
hdef : tdef;
filepos : tfileposinfo;
begin
oldp1:=nil;
p1:=nil;
filepos:=current_tokenpos;
again:=false;
if token=_ID then
begin
again:=true;
{ Handle references to self }
if (idtoken=_SELF) and
not(block_type in [bt_const,bt_type]) and
assigned(current_procinfo) and
assigned(current_procinfo.procdef._class) then
begin
p1:=load_self_node;
consume(_ID);
again:=true;
end
else
factor_read_id(p1,again);
if again then
begin
if (p1<>oldp1) then
begin
if assigned(p1) then
p1.fileinfo:=filepos;
oldp1:=p1;
filepos:=current_tokenpos;
end;
{ handle post fix operators }
postfixoperators(p1,again);
end;
end
else
case token of
_RETURN :
begin
consume(_RETURN);
if not(token in [_SEMICOLON,_ELSE,_END]) then
p1 := cexitnode.create(comp_expr(true))
else
p1 := cexitnode.create(nil);
end;
_INHERITED :
begin
again:=true;
consume(_INHERITED);
if assigned(current_procinfo) and
assigned(current_procinfo.procdef._class) then
begin
hclassdef:=current_procinfo.procdef._class.childof;
{ if inherited; only then we need the method with
the same name }
if token in endtokens then
begin
hs:=current_procinfo.procdef.procsym.name;
hsorg:=current_procinfo.procdef.procsym.realname;
anon_inherited:=true;
{ For message methods we need to search using the message
number or string }
pd:=tprocdef(tprocsym(current_procinfo.procdef.procsym).ProcdefList[0]);
srdef:=nil;
if (po_msgint in pd.procoptions) then
searchsym_in_class_by_msgint(hclassdef,pd.messageinf.i,srdef,srsym,srsymtable)
else
if (po_msgstr in pd.procoptions) then
searchsym_in_class_by_msgstr(hclassdef,pd.messageinf.str^,srsym,srsymtable)
else
searchsym_in_class(hclassdef,current_procinfo.procdef._class,hs,srsym,srsymtable);
end
else
begin
hs:=pattern;
hsorg:=orgpattern;
consume(_ID);
anon_inherited:=false;
searchsym_in_class(hclassdef,current_procinfo.procdef._class,hs,srsym,srsymtable);
end;
if assigned(srsym) then
begin
check_hints(srsym,srsym.symoptions);
{ load the procdef from the inherited class and
not from self }
if srsym.typ in [procsym,propertysym] then
begin
if (srsym.typ = procsym) then
begin
hdef:=hclassdef;
if (po_classmethod in current_procinfo.procdef.procoptions) or
(po_staticmethod in current_procinfo.procdef.procoptions) then
hdef:=tclassrefdef.create(hdef);
p1:=ctypenode.create(hdef);
end;
end
else
begin
Message(parser_e_methode_id_expected);
p1:=cerrornode.create;
end;
do_member_read(hclassdef,getaddr,srsym,p1,again,[cnf_inherited,cnf_anon_inherited]);
end
else
begin
if anon_inherited then
begin
{ For message methods we need to call DefaultHandler }
if (po_msgint in pd.procoptions) or
(po_msgstr in pd.procoptions) then
begin
searchsym_in_class(hclassdef,hclassdef,'DEFAULTHANDLER',srsym,srsymtable);
if not assigned(srsym) or
(srsym.typ<>procsym) then
internalerror(200303171);
p1:=nil;
do_proc_call(srsym,srsym.owner,hclassdef,false,again,p1,[]);
end
else
begin
{ we need to ignore the inherited; }
p1:=cnothingnode.create;
end;
end
else
begin
Message1(sym_e_id_no_member,hsorg);
p1:=cerrornode.create;
end;
again:=false;
end;
{ turn auto inheriting off }
anon_inherited:=false;
end
else
begin
Message(parser_e_generic_methods_only_in_methods);
again:=false;
p1:=cerrornode.create;
end;
postfixoperators(p1,again);
end;
_INTCONST :
begin
{$ifdef cpu64}
{ when already running under 64bit must read int64 constant, because reading
cardinal first will also succeed (code=0) for values > maxcardinal, because
range checking is off by default (PFV) }
val(pattern,ic,code);
if code=0 then
begin
consume(_INTCONST);
int_to_type(ic,hdef);
p1:=cordconstnode.create(ic,hdef,true);
end
else
begin
{ try qword next }
val(pattern,qc,code);
if code=0 then
begin
consume(_INTCONST);
hdef:=u64inttype;
p1:=cordconstnode.create(qc,hdef,true);
end;
end;
{$else}
{ try cardinal first }
val(pattern,card,code);
if code=0 then
begin
consume(_INTCONST);
int_to_type(card,hdef);
p1:=cordconstnode.create(card,hdef,true);
end
else
begin
{ then longint }
val(pattern,l,code);
if code = 0 then
begin
consume(_INTCONST);
int_to_type(l,hdef);
p1:=cordconstnode.create(l,hdef,true);
end
else
begin
{ then int64 }
val(pattern,ic,code);
if code=0 then
begin
consume(_INTCONST);
int_to_type(ic,hdef);
p1:=cordconstnode.create(ic,hdef,true);
end
else
begin
{ try qword next }
val(pattern,qc,code);
if code=0 then
begin
consume(_INTCONST);
hdef:=u64inttype;
p1:=cordconstnode.create(tconstexprint(qc),hdef,true);
end;
end;
end;
end;
{$endif}
if code<>0 then
begin
{ finally float }
val(pattern,d,code);
if code<>0 then
begin
Message(parser_e_invalid_integer);
consume(_INTCONST);
l:=1;
p1:=cordconstnode.create(l,sinttype,true);
end
else
begin
consume(_INTCONST);
p1:=crealconstnode.create(d,pbestrealtype^);
end;
end
else
{ the necessary range checking has already been done by val }
tordconstnode(p1).rangecheck:=false;
end;
_REALNUMBER :
begin
val(pattern,d,code);
if code<>0 then
begin
Message(parser_e_error_in_real);
d:=1.0;
end;
consume(_REALNUMBER);
{$ifdef FPC_REAL2REAL_FIXED}
if (d = single(d)) then
p1:=crealconstnode.create(d,s32floattype)
else if (d = double(d)) then
p1:=crealconstnode.create(d,s64floattype)
else
{$endif FPC_REAL2REAL_FIXED}
p1:=crealconstnode.create(d,pbestrealtype^);
{$ifdef FPC_HAS_STR_CURRENCY}
val(pattern,cur,code);
if code=0 then
trealconstnode(p1).value_currency:=cur;
{$endif FPC_HAS_STR_CURRENCY}
end;
_STRING :
begin
string_dec(hdef);
{ STRING can be also a type cast }
if try_to_consume(_LKLAMMER) then
begin
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=ctypeconvnode.create_explicit(p1,hdef);
{ handle postfix operators here e.g. string(a)[10] }
again:=true;
postfixoperators(p1,again);
end
else
p1:=ctypenode.create(hdef);
end;
_FILE :
begin
hdef:=cfiletype;
consume(_FILE);
{ FILE can be also a type cast }
if try_to_consume(_LKLAMMER) then
begin
p1:=comp_expr(true);
consume(_RKLAMMER);
p1:=ctypeconvnode.create_explicit(p1,hdef);
{ handle postfix operators here e.g. string(a)[10] }
again:=true;
postfixoperators(p1,again);
end
else
begin
p1:=ctypenode.create(hdef);
end;
end;
_CSTRING :
begin
p1:=cstringconstnode.createstr(pattern);
consume(_CSTRING);
end;
_CCHAR :
begin
p1:=cordconstnode.create(ord(pattern[1]),cchartype,true);
consume(_CCHAR);
end;
_CWSTRING:
begin
p1:=cstringconstnode.createwstr(patternw);
consume(_CWSTRING);
end;
_CWCHAR:
begin
p1:=cordconstnode.create(ord(getcharwidestring(patternw,0)),cwidechartype,true);
consume(_CWCHAR);
end;
_KLAMMERAFFE :
begin
consume(_KLAMMERAFFE);
got_addrn:=true;
{ support both @<x> and @(<x>) }
if try_to_consume(_LKLAMMER) then
begin
p1:=factor(true);
if token in [_CARET,_POINT,_LECKKLAMMER] then
begin
again:=true;
postfixoperators(p1,again);
end;
consume(_RKLAMMER);
end
else
p1:=factor(true);
if token in [_CARET,_POINT,_LECKKLAMMER] then
begin
again:=true;
postfixoperators(p1,again);
end;
got_addrn:=false;
p1:=caddrnode.create(p1);
if cs_typed_addresses in current_settings.localswitches then
include(p1.flags,nf_typedaddr);
{ Store the procvar that we are expecting, the
addrn will use the information to find the correct
procdef or it will return an error }
if assigned(getprocvardef) and
(taddrnode(p1).left.nodetype = loadn) then
taddrnode(p1).getprocvardef:=getprocvardef;
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
again:=true;
postfixoperators(p1,again);
end;
end;
_LECKKLAMMER :
begin
consume(_LECKKLAMMER);
p1:=factor_read_set;
consume(_RECKKLAMMER);
end;
_PLUS :
begin
consume(_PLUS);
p1:=factor(false);
{ we must generate a new node to do 0+<p1> otherwise the + will
not be checked }
p1:=caddnode.create(addn,genintconstnode(0),p1);
end;
_MINUS :
begin
consume(_MINUS);
if (token = _INTCONST) then
begin
{ ugly hack, but necessary to be able to parse }
{ -9223372036854775808 as int64 (JM) }
pattern := '-'+pattern;
p1:=sub_expr(oppower,false);
{ -1 ** 4 should be - (1 ** 4) and not
(-1) ** 4
This was the reason of tw0869.pp test failure PM }
if p1.nodetype=starstarn then
begin
if tbinarynode(p1).left.nodetype=ordconstn then
begin
tordconstnode(tbinarynode(p1).left).value:=-tordconstnode(tbinarynode(p1).left).value;
p1:=cunaryminusnode.create(p1);
end
else if tbinarynode(p1).left.nodetype=realconstn then
begin
trealconstnode(tbinarynode(p1).left).value_real:=-trealconstnode(tbinarynode(p1).left).value_real;
trealconstnode(tbinarynode(p1).left).value_currency:=-trealconstnode(tbinarynode(p1).left).value_currency;
p1:=cunaryminusnode.create(p1);
end
else
internalerror(20021029);
end;
end
else
begin
p1:=sub_expr(oppower,false);
p1:=cunaryminusnode.create(p1);
end;
end;
_OP_NOT :
begin
consume(_OP_NOT);
p1:=factor(false);
p1:=cnotnode.create(p1);
end;
_TRUE :
begin
consume(_TRUE);
p1:=cordconstnode.create(1,booltype,false);
end;
_FALSE :
begin
consume(_FALSE);
p1:=cordconstnode.create(0,booltype,false);
end;
_NIL :
begin
consume(_NIL);
p1:=cnilnode.create;
{ It's really ugly code nil^, but delphi allows it }
if token in [_CARET] then
begin
again:=true;
postfixoperators(p1,again);
end;
end;
else
begin
Message(parser_e_illegal_expression);
p1:=cerrornode.create;
{ recover }
consume(token);
end;
end;
{ generate error node if no node is created }
if not assigned(p1) then
begin
{$ifdef EXTDEBUG}
Comment(V_Warning,'factor: p1=nil');
{$endif}
p1:=cerrornode.create;
end;
{ get the resultdef for the node }
if (not assigned(p1.resultdef)) then
do_typecheckpass(p1);
if assigned(p1) and
(p1<>oldp1) then
p1.fileinfo:=filepos;
factor:=p1;
end;
{$maxfpuregisters default}
{****************************************************************************
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],
[_PLUS,_MINUS,_OP_OR,_PIPE,_OP_XOR],
[_CARET,_SYMDIF,_STARSTAR,_STAR,_SLASH,
_OP_AS,_OP_IS,_OP_AND,_AMPERSAND,_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:=current_tokenpos;
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,
_PIPE {macpas only} :
begin
p1:=caddnode.create(orn,p1,p2);
if (oldt = _PIPE) then
include(p1.flags,nf_short_bool);
end;
_OP_AND,
_AMPERSAND {macpas only} :
begin
p1:=caddnode.create(andn,p1,p2);
if (oldt = _AMPERSAND) then
include(p1.flags,nf_short_bool);
end;
_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);
_UNEQUAL :
p1:=caddnode.create(unequaln,p1,p2);
end;
p1.fileinfo:=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);
{ get the resultdef for this expression }
if not assigned(p1.resultdef) then
do_typecheckpass(p1);
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);
{ get the resultdef for this expression }
if not assigned(p1.resultdef) then
do_typecheckpass(p1);
filepos:=current_tokenpos;
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.resultdef.typ=procvardef) then
getprocvardef:=tprocvardef(p1.resultdef);
p2:=sub_expr(opcompare,true);
if assigned(getprocvardef) then
handle_procvar(getprocvardef,p2);
getprocvardef:=nil;
p1:=cassignmentnode.create(p1,p2);
end;
_PLUSASN :
begin
consume(_PLUSASN);
p2:=sub_expr(opcompare,true);
p1:=gen_c_style_operator(addn,p1,p2);
end;
_MINUSASN :
begin
consume(_MINUSASN);
p2:=sub_expr(opcompare,true);
p1:=gen_c_style_operator(subn,p1,p2);
end;
_STARASN :
begin
consume(_STARASN );
p2:=sub_expr(opcompare,true);
p1:=gen_c_style_operator(muln,p1,p2);
end;
_SLASHASN :
begin
consume(_SLASHASN );
p2:=sub_expr(opcompare,true);
p1:=gen_c_style_operator(slashn,p1,p2);
end;
end;
{ get the resultdef for this expression }
if not assigned(p1.resultdef) then
do_typecheckpass(p1);
afterassignment:=oldafterassignment;
if p1<>oldp1 then
p1.fileinfo:=filepos;
expr:=p1;
end;
function get_intconst:TConstExprInt;
{Reads an expression, tries to evalute it and check if it is an integer
constant. Then the constant is returned.}
var
p:tnode;
begin
result:=0;
p:=comp_expr(true);
if not codegenerror then
begin
if (p.nodetype<>ordconstn) or
not(is_integer(p.resultdef)) then
Message(parser_e_illegal_expression)
else
result:=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);
if p.nodetype<>stringconstn then
begin
if (p.nodetype=ordconstn) and is_char(p.resultdef) then
get_stringconst:=char(tordconstnode(p).value)
else
Message(parser_e_illegal_expression);
end
else
get_stringconst:=strpas(tstringconstnode(p).value_str);
p.free;
end;
end.
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