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b495fbb991
fpc/compiler/pexpr.pas
Jonas Maebe b495fbb991 * let search_class_helper() only return class helper methods; it could 
also return regular objcclass methods before, because these are also
    registered under class helper procsyms for future id.anymethod support
  * give an error when calling an inherited method from an objccategory
    method, if that is not declared in the parent of the extended class
    (since calling inherited in an objccategory method is the same as
     calling inherited in a method of the extended class; if a method is
     replaced, calling inherited will *not* call the original method
     from the original class)

git-svn-id: trunk@14213 -
2009-11-18 21:49:57 +00:00

2880 lines
109 KiB
ObjectPascal
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{
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,constexp;
{ 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; allowtypedef: boolean);
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; allowtypedef: boolean);
{ reads a string type with optional length }
{ and returns a pointer to the string }
{ definition }
var
p : tnode;
begin
def:=cshortstringtype;
consume(_STRING);
if (token=_LECKKLAMMER) then
begin
if not(allowtypedef) then
Message(parser_e_no_local_para_def);
consume(_LECKKLAMMER);
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(int64(tordconstnode(p).value));
end
else
if tordconstnode(p).value<>255 then
def:=tstringdef.createshort(int64(tordconstnode(p).value));
end;
p.free;
end
else
begin
if cs_ansistrings in current_settings.localswitches then
def:=cansistringtype
else
def:=cshortstringtype;
end;
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;
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;
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(pint),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 not(is_objc_class_or_protocol(p1.resultdef)) and
((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,
in_objc_encode_x :
begin
if (l=in_typeinfo_x) or
(m_objectivec1 in current_settings.modeswitches) then
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(l,false,p1);
statement_syssym:=p2;
end
else
begin
Message1(sym_e_id_not_found, orgpattern);
statement_syssym:=cerrornode.create;
end;
end;
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;
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_or_objc(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,
in_readstr_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_objc_selector_x:
begin
if (m_objectivec1 in current_settings.modeswitches) then
begin
consume(_LKLAMMER);
in_args:=true;
{ don't turn procsyms into calls (getaddr = true) }
p1:=factor(true);
p2:=geninlinenode(l,false,p1);
consume(_RKLAMMER);
statement_syssym:=p2;
end
else
begin
Message1(sym_e_id_not_found, orgpattern);
statement_syssym:=cerrornode.create;
end;
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,
in_writestr_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
(except if we are in a static class method)
}
membercall:=
not(assigned(current_procinfo) and
([po_staticmethod,po_classmethod] <= current_procinfo.procdef.procoptions)) and
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).methodpointer.getcopy);
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;
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(propsym,palt_write,propaccesslist) 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(propsym,palt_read,propaccesslist) 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_in_class(tobjectdef(sym.owner.defowner),tobjectdef(sym.owner.defowner),static_name,sym,srsymtable);
if assigned(sym) then
check_hints(sym,sym.symoptions,sym.deprecatedmsg);
p1.free;
p1:=nil;
{ static syms are always stored as absolutevarsym to handle scope and storage properly }
propaccesslist_to_node(p1,nil,tabsolutevarsym(sym).ref);
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(out p1:tnode;var again:boolean);
var
pc : pchar;
srsym : tsym;
unit_found : boolean;
srsymtable : TSymtable;
hdef : tdef;
orgstoredpattern,
storedpattern : string;
len : longint;
t : ttoken;
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,t);
storedpattern:=pattern;
orgstoredpattern:=orgpattern;
consume(t);
{ 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,srsym.deprecatedmsg)
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
{ result(x) is not allowed }
not(vo_is_result 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)
)
) 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 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_objectdef) and
not(getaddr) then
begin
if current_objectdef.is_related(tobjectdef(hdef)) then
begin
p1:=ctypenode.create(hdef);
{ search also in inherited methods }
searchsym_in_class(tobjectdef(hdef),current_objectdef,pattern,srsym,srsymtable);
if assigned(srsym) then
check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
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,srsym.deprecatedmsg);
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) or
is_objcclass(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,srsym.deprecatedmsg);
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_const_type,bt_var_type]) 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
if (srsymtable.symtabletype=ObjectSymtable) then
p1:=load_self_node;
{ 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(2009111510);
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);
if symtablestack.top.symtablelevel<>srsymtable.symtablelevel then
begin
tlabelsym(srsym).nonlocal:=true;
exclude(current_procinfo.procdef.procoptions,po_inline);
end;
tlabelsym(srsym).defined:=true;
p1:=clabelnode.create(nil,tlabelsym(srsym));
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
---------------------------------------------}
{ returns whether or not p1 has been changed }
function postfixoperators(var p1:tnode;var again:boolean): 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 if try_to_consume(_LKLAMMER) then
begin
repeat
comp_expr(true);
until not try_to_consume(_COMMA);
consume(_RKLAMMER);
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(ctypeconvnode.create_internal(p1,cvarianttype)
,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;
nodechanged : boolean;
label
skipreckklammercheck;
begin
result:=false;
again:=true;
while again do
begin
{ we need the resultdef }
do_typecheckpass_changed(p1,nodechanged);
result:=result or nodechanged;
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_or_object(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
{ in all of the cases below, p1 is changed }
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
if p1.resultdef.typ<>undefineddef then
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,srsym.deprecatedmsg);
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;
{ property setter? }
if (token=_ASSIGNMENT) and not(afterassignment) then
begin
consume(_ASSIGNMENT);
{ read the expression }
p3:=comp_expr(true);
{ concat value parameter too }
p2:=ccallparanode.create(p3,p2);
{ passing p3 here is only for information purposes }
p1:=translate_disp_call(p1,p2,p3,dispatchstring,0,false);
end
else
begin
p1:=translate_disp_call(p1,p2,nil,dispatchstring,0,
{ this is only an approximation
setting useresult if not necessary is only a waste of time, no more, no less (FK) }
afterassignment or in_args or (token<>_SEMICOLON));
end;
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,srsym.deprecatedmsg);
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,srsym.deprecatedmsg);
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
if p1.resultdef.typ<>undefineddef then
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
{ Typenode for typecasting or expecting a procvar }
if (p1.nodetype=typen) or
(
assigned(getprocvardef) and
equal_defs(p1.resultdef,getprocvardef)
) then
begin
if 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;
{ we only try again if p1 was changed }
if again or
(p1.nodetype=errorn) then
result:=true;
end; { while again }
end;
{---------------------------------------------
Factor (Main)
---------------------------------------------}
var
l : longint;
ic : int64;
qc : qword;
p1 : tnode;
code : integer;
srsym : tsym;
srsymtable : TSymtable;
pd : tprocdef;
hclassdef : tobjectdef;
d : bestreal;
cur : currency;
hs,hsorg : string;
hdef : tdef;
filepos : tfileposinfo;
again,
updatefpos,
nodechanged : boolean;
begin
{ can't keep a copy of p1 and compare pointers afterwards, because
p1 may be freed and reallocated in the same place! }
updatefpos:=false;
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,bt_const_type,bt_var_type]) and
assigned(current_objectdef) then
begin
p1:=load_self_node;
consume(_ID);
again:=true;
end
else
factor_read_id(p1,again);
if assigned(p1) then
begin
{ factor_read_id will set the filepos to after the id,
and in case of _SELF the filepos will already be the
same as filepos (so setting it again doesn't hurt). }
p1.fileinfo:=filepos;
filepos:=current_tokenpos;
end;
{ handle post fix operators }
updatefpos:=postfixoperators(p1,again);
end
else
begin
updatefpos:=true;
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_objectdef) then
begin
hclassdef:=current_objectdef.childof;
{ Objective-C categories *replace* methods in the class
they extend, or add methods to it. So calling an
inherited method always calls the method inherited from
the parent of the extended class }
if is_objccategory(current_objectdef) then
hclassdef:=hclassdef.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_objectdef,hs,srsym,srsymtable);
end
else
begin
hs:=pattern;
hsorg:=orgpattern;
consume(_ID);
anon_inherited:=false;
searchsym_in_class(hclassdef,current_objectdef,hs,srsym,srsymtable);
end;
if assigned(srsym) then
begin
check_hints(srsym,srsym.symoptions,srsym.deprecatedmsg);
{ load the procdef from the inherited class and
not from self }
case srsym.typ of
procsym:
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;
propertysym:
;
else
begin
Message(parser_e_methode_id_expected);
p1:=cerrornode.create;
end;
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
{Try first wether the value fits in an 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);
int_to_type(qc,hdef);
p1:=cordconstnode.create(qc,hdef,true);
end;
end;
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 current_settings.fputype=fpu_none then
Message(parser_e_unsupported_real);
if (current_settings.minfpconstprec=s32real) and
(d = single(d)) then
p1:=crealconstnode.create(d,s32floattype)
else if (current_settings.minfpconstprec=s64real) and
(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,true);
{ 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
else
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);
p1.fileinfo:=filepos;
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;
_OBJCPROTOCOL:
begin
{ The @protocol keyword is used in two ways in Objective-C:
1) to declare protocols (~ Object Pascal interfaces)
2) to obtain the metaclass (~ Object Pascal) "class of")
of a declared protocol
This code is for handling the second case. Because of 1),
we cannot simply use a system unit symbol.
}
consume(_OBJCPROTOCOL);
consume(_LKLAMMER);
p1:=factor(false);
consume(_RKLAMMER);
p1:=cinlinenode.create(in_objc_protocol_x,false,p1);
end;
else
begin
Message(parser_e_illegal_expression);
p1:=cerrornode.create;
{ recover }
consume(token);
end;
end;
end;
{ generate error node if no node is created }
if not assigned(p1) then
begin
{$ifdef EXTDEBUG}
Comment(V_Warning,'factor: p1=nil');
{$endif}
p1:=cerrornode.create;
updatefpos:=true;
end;
{ get the resultdef for the node }
if (not assigned(p1.resultdef)) then
begin
do_typecheckpass_changed(p1,nodechanged);
updatefpos:=updatefpos or nodechanged;
end;
if assigned(p1) and
updatefpos then
p1.fileinfo:=filepos;
factor:=p1;
end;
{$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;
filepos : tfileposinfo;
oldafterassignment,
updatefpos : boolean;
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;
updatefpos:=true;
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;
else
updatefpos:=false;
end;
{ get the resultdef for this expression }
if not assigned(p1.resultdef) then
do_typecheckpass(p1);
afterassignment:=oldafterassignment;
if updatefpos 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(int64(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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