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fpc/compiler/defcmp.pas
peter 90473fa87f * constant string conversion fixed, it's now equal to both 
shortstring, ansistring and the typeconvnode will return
    te_equal but still return convtype to change the constnode
2003-01-09 21:43:39 +00:00

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
Compare definitions and parameter lists
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 defcmp;
{$i fpcdefs.inc}
interface
uses
cclasses,
cpuinfo,
globals,
node,
symconst,symbase,symtype,symdef;
type
{ if acp is cp_all the var const or nothing are considered equal }
compare_type = ( cp_none, cp_value_equal_const, cp_all,cp_procvar);
tconverttype = (
tc_equal,
tc_not_possible,
tc_string_2_string,
tc_char_2_string,
tc_char_2_chararray,
tc_pchar_2_string,
tc_cchar_2_pchar,
tc_cstring_2_pchar,
tc_ansistring_2_pchar,
tc_string_2_chararray,
tc_chararray_2_string,
tc_array_2_pointer,
tc_pointer_2_array,
tc_int_2_int,
tc_int_2_bool,
tc_bool_2_bool,
tc_bool_2_int,
tc_real_2_real,
tc_int_2_real,
tc_proc_2_procvar,
tc_arrayconstructor_2_set,
tc_load_smallset,
tc_cord_2_pointer,
tc_intf_2_string,
tc_intf_2_guid,
tc_class_2_intf,
tc_char_2_char,
tc_normal_2_smallset,
tc_dynarray_2_openarray,
tc_pwchar_2_string,
tc_variant_2_dynarray,
tc_dynarray_2_variant
);
function compare_defs_ext(def_from,def_to : tdef;
fromtreetype : tnodetype;
explicit : boolean;
check_operator : boolean;
var doconv : tconverttype;
var operatorpd : tprocdef):tequaltype;
{ Returns if the type def_from can be converted to def_to or if both types are equal }
function compare_defs(def_from,def_to:tdef;fromtreetype:tnodetype):tequaltype;
{ Returns true, if def1 and def2 are semantically the same }
function equal_defs(def_from,def_to:tdef):boolean;
{ Checks for type compatibility (subgroups of type)
used for case statements... probably missing stuff
to use on other types }
function is_subequal(def1, def2: tdef): boolean;
function assignment_overloaded(from_def,to_def : tdef) : tprocdef;
{# true, if two parameter lists are equal
if acp is cp_none, all have to match exactly
if acp is cp_value_equal_const call by value
and call by const parameter are assumed as
equal
allowdefaults indicates if default value parameters
are allowed (in this case, the search order will first
search for a routine with default parameters, before
searching for the same definition with no parameters)
}
function compare_paras(paralist1,paralist2 : TLinkedList; acp : compare_type;allowdefaults:boolean):tequaltype;
{ True if a function can be assigned to a procvar }
{ changed first argument type to pabstractprocdef so that it can also be }
{ used to test compatibility between two pprocvardefs (JM) }
function proc_to_procvar_equal(def1:tabstractprocdef;def2:tprocvardef):tequaltype;
implementation
uses
globtype,tokens,
verbose,systems,
symsym,symtable,
defutil,symutil;
function assignment_overloaded(from_def,to_def:tdef):tprocdef;
begin
if assigned(overloaded_operators[_ASSIGNMENT]) then
assignment_overloaded:=overloaded_operators[_ASSIGNMENT].search_procdef_assignment_operator(from_def,to_def)
else
assignment_overloaded:=nil;
end;
function compare_defs_ext(def_from,def_to : tdef;
fromtreetype : tnodetype;
explicit : boolean;
check_operator : boolean;
var doconv : tconverttype;
var operatorpd : tprocdef):tequaltype;
{ Tbasetype:
uvoid,
u8bit,u16bit,u32bit,u64bit,
s8bit,s16bit,s32bit,s64bit,
bool8bit,bool16bit,bool32bit,
uchar,uwidechar }
type
tbasedef=(bvoid,bchar,bint,bbool);
const
basedeftbl:array[tbasetype] of tbasedef =
(bvoid,
bint,bint,bint,bint,
bint,bint,bint,bint,
bbool,bbool,bbool,
bchar,bchar);
basedefconvertsimplicit : array[tbasedef,tbasedef] of tconverttype =
{ void, char, int, bool }
((tc_not_possible,tc_not_possible,tc_not_possible,tc_not_possible),
(tc_not_possible,tc_char_2_char,tc_not_possible,tc_not_possible),
(tc_not_possible,tc_not_possible,tc_int_2_int,tc_not_possible),
(tc_not_possible,tc_not_possible,tc_not_possible,tc_bool_2_bool));
basedefconvertsexplicit : array[tbasedef,tbasedef] of tconverttype =
{ void, char, int, bool }
((tc_not_possible,tc_not_possible,tc_not_possible,tc_not_possible),
(tc_not_possible,tc_char_2_char,tc_int_2_int,tc_int_2_bool),
(tc_not_possible,tc_int_2_int,tc_int_2_int,tc_int_2_bool),
(tc_not_possible,tc_bool_2_int,tc_bool_2_int,tc_bool_2_bool));
var
subeq,eq : tequaltype;
hd1,hd2 : tdef;
hct : tconverttype;
hd3 : tobjectdef;
hpd : tprocdef;
begin
{ safety check }
if not(assigned(def_from) and assigned(def_to)) then
begin
compare_defs_ext:=te_incompatible;
exit;
end;
{ same def? then we've an exact match }
if def_from=def_to then
begin
compare_defs_ext:=te_exact;
exit;
end;
{ we walk the wanted (def_to) types and check then the def_from
types if there is a conversion possible }
eq:=te_incompatible;
doconv:=tc_not_possible;
case def_to.deftype of
orddef :
begin
case def_from.deftype of
orddef :
begin
if (torddef(def_from).typ=torddef(def_to).typ) then
begin
case torddef(def_from).typ of
u8bit,u16bit,u32bit,u64bit,
s8bit,s16bit,s32bit,s64bit:
begin
if (torddef(def_from).low=torddef(def_to).low) and
(torddef(def_from).high=torddef(def_to).high) then
eq:=te_equal
else
eq:=te_convert_l1;
end;
uvoid,uchar,uwidechar,
bool8bit,bool16bit,bool32bit:
eq:=te_equal;
else
internalerror(200210061);
end;
end
else
begin
if explicit then
doconv:=basedefconvertsexplicit[basedeftbl[torddef(def_from).typ],basedeftbl[torddef(def_to).typ]]
else
doconv:=basedefconvertsimplicit[basedeftbl[torddef(def_from).typ],basedeftbl[torddef(def_to).typ]];
if (doconv=tc_not_possible) then
eq:=te_incompatible
else
{ "punish" bad type conversions :) (JM) }
if (not is_in_limit(def_from,def_to)) and
(def_from.size > def_to.size) then
eq:=te_convert_l2
else
eq:=te_convert_l1;
end;
end;
enumdef :
begin
{ needed for char(enum) }
if explicit then
begin
doconv:=tc_int_2_int;
eq:=te_convert_l1;
end;
end;
classrefdef,
procvardef,
pointerdef :
begin
if explicit then
begin
eq:=te_convert_l1;
if (fromtreetype=niln) then
begin
{ will be handled by the constant folding }
doconv:=tc_equal;
end
else
doconv:=tc_int_2_int;
end;
end;
end;
end;
stringdef :
begin
case def_from.deftype of
stringdef :
begin
{ Constant string }
if (fromtreetype=stringconstn) then
begin
if (tstringdef(def_from).string_typ=tstringdef(def_to).string_typ) then
eq:=te_equal
else
begin
doconv:=tc_string_2_string;
{ Don't prefer conversions from widestring to a
normal string as we can loose information }
if tstringdef(def_from).string_typ=st_widestring then
eq:=te_convert_l1
else
begin
if tstringdef(def_to).string_typ=st_widestring then
eq:=te_convert_l1
else
eq:=te_equal; { we can change the stringconst node }
end;
end;
end
else
{ Same string type, for shortstrings also the length must match }
if (tstringdef(def_from).string_typ=tstringdef(def_to).string_typ) and
((tstringdef(def_from).string_typ<>st_shortstring) or
(tstringdef(def_from).len=tstringdef(def_to).len)) then
eq:=te_equal
else
begin
doconv:=tc_string_2_string;
{ Prefer conversions to shortstring over other
conversions. This is compatible with Delphi (PFV) }
if tstringdef(def_to).string_typ=st_shortstring then
eq:=te_convert_l1
else
eq:=te_convert_l2;
end;
end;
orddef :
begin
{ char to string}
if is_char(def_from) or
is_widechar(def_from) then
begin
doconv:=tc_char_2_string;
eq:=te_convert_l1;
end;
end;
arraydef :
begin
{ array of char to string, the length check is done by the firstpass of this node }
if is_chararray(def_from) or
(is_char(tarraydef(def_from).elementtype.def) and
is_open_array(def_from)) then
begin
doconv:=tc_chararray_2_string;
if is_open_array(def_from) or
(is_shortstring(def_to) and
(def_from.size <= 255)) or
(is_ansistring(def_to) and
(def_from.size > 255)) then
eq:=te_convert_l1
else
eq:=te_convert_l2;
end;
end;
pointerdef :
begin
{ pchar can be assigned to short/ansistrings,
but not in tp7 compatible mode }
if not(m_tp7 in aktmodeswitches) then
begin
if is_pchar(def_from) then
begin
doconv:=tc_pchar_2_string;
{ trefer ansistrings because pchars can overflow shortstrings, }
{ but only if ansistrings are the default (JM) }
if (is_shortstring(def_to) and
not(cs_ansistrings in aktlocalswitches)) or
(is_ansistring(def_to) and
(cs_ansistrings in aktlocalswitches)) then
eq:=te_convert_l1
else
eq:=te_convert_l2;
end
else if is_pwidechar(def_from) then
begin
doconv:=tc_pwchar_2_string;
{ trefer ansistrings because pchars can overflow shortstrings, }
{ but only if ansistrings are the default (JM) }
if is_widestring(def_to) then
eq:=te_convert_l1
else
eq:=te_convert_l2;
end;
end;
end;
end;
end;
floatdef :
begin
case def_from.deftype of
orddef :
begin { ordinal to real }
if is_integer(def_from) then
begin
doconv:=tc_int_2_real;
eq:=te_convert_l1;
end;
end;
floatdef :
begin
if tfloatdef(def_from).typ=tfloatdef(def_to).typ then
eq:=te_equal
else
begin
doconv:=tc_real_2_real;
eq:=te_convert_l1;
end;
end;
end;
end;
enumdef :
begin
case def_from.deftype of
enumdef :
begin
if explicit then
begin
eq:=te_convert_l1;
doconv:=tc_int_2_int;
end
else
begin
hd1:=def_from;
while assigned(tenumdef(hd1).basedef) do
hd1:=tenumdef(hd1).basedef;
hd2:=def_to;
while assigned(tenumdef(hd2).basedef) do
hd2:=tenumdef(hd2).basedef;
if (hd1=hd2) then
begin
eq:=te_convert_l1;
{ because of packenum they can have different sizes! (JM) }
doconv:=tc_int_2_int;
end;
end;
end;
orddef :
begin
if explicit then
begin
eq:=te_convert_l1;
doconv:=tc_int_2_int;
end;
end;
end;
end;
arraydef :
begin
{ open array is also compatible with a single element of its base type }
if is_open_array(def_to) and
equal_defs(def_from,tarraydef(def_to).elementtype.def) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
begin
case def_from.deftype of
arraydef :
begin
{ to dynamic array }
if is_dynamic_array(def_to) then
begin
{ dynamic array -> dynamic array }
if is_dynamic_array(def_from) and
equal_defs(tarraydef(def_from).elementtype.def,tarraydef(def_to).elementtype.def) then
eq:=te_equal;
end
else
{ to open array }
if is_open_array(def_to) then
begin
{ array constructor -> open array }
if is_array_constructor(def_from) then
begin
if is_void(tarraydef(def_from).elementtype.def) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
begin
subeq:=compare_defs_ext(tarraydef(def_from).elementtype.def,
tarraydef(def_to).elementtype.def,
arrayconstructorn,false,true,hct,hpd);
if (subeq>=te_equal) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
if (subeq>te_incompatible) then
begin
doconv:=hct;
eq:=te_convert_l2;
end;
end;
end
else
{ dynamic array -> open array }
if is_dynamic_array(def_from) and
equal_defs(tarraydef(def_from).elementtype.def,tarraydef(def_to).elementtype.def) then
begin
doconv:=tc_dynarray_2_openarray;
eq:=te_convert_l2;
end
else
{ array -> open array }
if equal_defs(tarraydef(def_from).elementtype.def,tarraydef(def_to).elementtype.def) then
eq:=te_equal;
end
else
{ to array of const }
if is_array_of_const(def_to) then
begin
if is_array_of_const(def_from) or
is_array_constructor(def_from) then
begin
eq:=te_equal;
end
else
{ array of tvarrec -> array of const }
if equal_defs(tarraydef(def_to).elementtype.def,tarraydef(def_from).elementtype.def) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end
else
{ other arrays }
begin
{ open array -> array }
if is_open_array(def_from) and
equal_defs(tarraydef(def_from).elementtype.def,tarraydef(def_to).elementtype.def) then
begin
eq:=te_equal
end
else
{ array -> array }
if not(m_tp7 in aktmodeswitches) and
not(m_delphi in aktmodeswitches) and
(tarraydef(def_from).lowrange=tarraydef(def_to).lowrange) and
(tarraydef(def_from).highrange=tarraydef(def_to).highrange) and
equal_defs(tarraydef(def_from).elementtype.def,tarraydef(def_to).elementtype.def) and
equal_defs(tarraydef(def_from).rangetype.def,tarraydef(def_to).rangetype.def) then
begin
eq:=te_equal
end;
end;
end;
pointerdef :
begin
{ nil is compatible with dyn. arrays }
if is_dynamic_array(def_to) and
(fromtreetype=niln) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
if is_zero_based_array(def_to) and
equal_defs(tpointerdef(def_from).pointertype.def,tarraydef(def_to).elementtype.def) then
begin
doconv:=tc_pointer_2_array;
eq:=te_convert_l1;
end;
end;
stringdef :
begin
{ string to char array }
if (not is_special_array(def_to)) and
is_char(tarraydef(def_to).elementtype.def) then
begin
doconv:=tc_string_2_chararray;
eq:=te_convert_l1;
end;
end;
orddef:
begin
if is_chararray(def_to) and
is_char(def_from) then
begin
doconv:=tc_char_2_chararray;
eq:=te_convert_l2;
end;
end;
recorddef :
begin
{ tvarrec -> array of const }
if is_array_of_const(def_to) and
equal_defs(def_from,tarraydef(def_to).elementtype.def) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end;
variantdef :
begin
if is_dynamic_array(def_to) then
begin
doconv:=tc_variant_2_dynarray;
eq:=te_convert_l1;
end;
end;
end;
end;
end;
pointerdef :
begin
case def_from.deftype of
stringdef :
begin
{ string constant (which can be part of array constructor)
to zero terminated string constant }
if (fromtreetype in [arrayconstructorn,stringconstn]) and
(is_pchar(def_to) or is_pwidechar(def_to)) then
begin
doconv:=tc_cstring_2_pchar;
eq:=te_convert_l1;
end
else
if explicit then
begin
{ pchar(ansistring) }
if is_pchar(def_to) and
is_ansistring(def_from) then
begin
doconv:=tc_ansistring_2_pchar;
eq:=te_convert_l1;
end
else
{ pwidechar(ansistring) }
if is_pwidechar(def_to) and
is_widestring(def_from) then
begin
doconv:=tc_ansistring_2_pchar;
eq:=te_convert_l1;
end;
end;
end;
orddef :
begin
{ char constant to zero terminated string constant }
if (fromtreetype=ordconstn) then
begin
if is_char(def_from) and
is_pchar(def_to) then
begin
doconv:=tc_cchar_2_pchar;
eq:=te_convert_l1;
end
else
if is_integer(def_from) then
begin
doconv:=tc_cord_2_pointer;
eq:=te_convert_l1;
end;
end;
if (eq=te_incompatible) and
explicit and
(m_delphi in aktmodeswitches) then
begin
doconv:=tc_int_2_int;
eq:=te_convert_l1;
end;
end;
arraydef :
begin
{ chararray to pointer }
if is_zero_based_array(def_from) and
equal_defs(tarraydef(def_from).elementtype.def,tpointerdef(def_to).pointertype.def) then
begin
doconv:=tc_array_2_pointer;
eq:=te_convert_l1;
end;
end;
pointerdef :
begin
{ check for far pointers }
if (tpointerdef(def_from).is_far<>tpointerdef(def_to).is_far) then
begin
eq:=te_incompatible;
end
else
{ the types can be forward type, handle before normal type check !! }
if assigned(def_to.typesym) and
(tpointerdef(def_to).pointertype.def.deftype=forwarddef) then
begin
if (def_from.typesym=def_to.typesym) then
eq:=te_equal
end
else
{ same types }
if (tpointerdef(def_from).pointertype.def=tpointerdef(def_to).pointertype.def) then
begin
eq:=te_equal
end
else
{ child class pointer can be assigned to anchestor pointers }
if (
(tpointerdef(def_from).pointertype.def.deftype=objectdef) and
(tpointerdef(def_to).pointertype.def.deftype=objectdef) and
tobjectdef(tpointerdef(def_from).pointertype.def).is_related(
tobjectdef(tpointerdef(def_to).pointertype.def))
) or
{ all pointers can be assigned to/from void-pointer }
is_void(tpointerdef(def_to).pointertype.def) or
is_void(tpointerdef(def_from).pointertype.def) then
begin
doconv:=tc_equal;
{ give pwidechar a small penalty }
if is_pwidechar(def_to) then
eq:=te_convert_l2
else
eq:=te_convert_l1;
end;
end;
procvardef :
begin
{ procedure variable can be assigned to an void pointer }
{ Not anymore. Use the @ operator now.}
if not(m_tp_procvar in aktmodeswitches) and
(tpointerdef(def_to).pointertype.def.deftype=orddef) and
(torddef(tpointerdef(def_to).pointertype.def).typ=uvoid) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end;
classrefdef,
objectdef :
begin
{ class types and class reference type
can be assigned to void pointers }
if (
is_class_or_interface(def_from) or
(def_from.deftype=classrefdef)
) and
(tpointerdef(def_to).pointertype.def.deftype=orddef) and
(torddef(tpointerdef(def_to).pointertype.def).typ=uvoid) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end;
end;
end;
setdef :
begin
case def_from.deftype of
setdef :
begin
if assigned(tsetdef(def_from).elementtype.def) and
assigned(tsetdef(def_to).elementtype.def) then
begin
{ sets with the same element base type are equal }
if is_subequal(tsetdef(def_from).elementtype.def,tsetdef(def_to).elementtype.def) then
eq:=te_equal;
end
else
{ empty set is compatible with everything }
eq:=te_equal;
end;
arraydef :
begin
{ automatic arrayconstructor -> set conversion }
if is_array_constructor(def_from) then
begin
doconv:=tc_arrayconstructor_2_set;
eq:=te_convert_l1;
end;
end;
end;
end;
procvardef :
begin
case def_from.deftype of
procdef :
begin
{ proc -> procvar }
if (m_tp_procvar in aktmodeswitches) then
begin
subeq:=proc_to_procvar_equal(tprocdef(def_from),tprocvardef(def_to));
if subeq>te_incompatible then
begin
doconv:=tc_proc_2_procvar;
eq:=te_convert_l1;
end;
end;
end;
procvardef :
begin
{ procvar -> procvar }
eq:=proc_to_procvar_equal(tprocvardef(def_from),tprocvardef(def_to));
end;
pointerdef :
begin
{ nil is compatible with procvars }
if (fromtreetype=niln) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
{ for example delphi allows the assignement from pointers }
{ to procedure variables }
if (m_pointer_2_procedure in aktmodeswitches) and
(tpointerdef(def_from).pointertype.def.deftype=orddef) and
(torddef(tpointerdef(def_from).pointertype.def).typ=uvoid) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end;
end;
end;
objectdef :
begin
{ object pascal objects }
if (def_from.deftype=objectdef) and
tobjectdef(def_from).is_related(tobjectdef(def_to)) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
{ Class/interface specific }
if is_class_or_interface(def_to) then
begin
{ void pointer also for delphi mode }
if (m_delphi in aktmodeswitches) and
is_voidpointer(def_from) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
else
{ nil is compatible with class instances and interfaces }
if (fromtreetype=niln) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end
{ classes can be assigned to interfaces }
else if is_interface(def_to) and
is_class(def_from) and
assigned(tobjectdef(def_from).implementedinterfaces) then
begin
{ we've to search in parent classes as well }
hd3:=tobjectdef(def_from);
while assigned(hd3) do
begin
if hd3.implementedinterfaces.searchintf(def_to)<>-1 then
begin
doconv:=tc_class_2_intf;
eq:=te_convert_l1;
break;
end;
hd3:=hd3.childof;
end;
end
{ Interface 2 GUID handling }
else if (def_to=tdef(rec_tguid)) and
(fromtreetype=typen) and
is_interface(def_from) and
assigned(tobjectdef(def_from).iidguid) then
begin
eq:=te_convert_l1;
doconv:=tc_equal;
end;
end;
end;
classrefdef :
begin
{ similar to pointerdef wrt forwards }
if assigned(def_to.typesym) and
(tclassrefdef(def_to).pointertype.def.deftype=forwarddef) then
begin
if (def_from.typesym=def_to.typesym) then
eq:=te_equal;
end
else
{ class reference types }
if (def_from.deftype=classrefdef) then
begin
if equal_defs(tclassrefdef(def_from).pointertype.def,tclassrefdef(def_to).pointertype.def) then
begin
eq:=te_equal;
end
else
begin
doconv:=tc_equal;
if explicit or
tobjectdef(tclassrefdef(def_from).pointertype.def).is_related(
tobjectdef(tclassrefdef(def_to).pointertype.def)) then
eq:=te_convert_l1;
end;
end
else
{ nil is compatible with class references }
if (fromtreetype=niln) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end;
filedef :
begin
{ typed files are all equal to the abstract file type
name TYPEDFILE in system.pp in is_equal in types.pas
the problem is that it sholud be also compatible to FILE
but this would leed to a problem for ASSIGN RESET and REWRITE
when trying to find the good overloaded function !!
so all file function are doubled in system.pp
this is not very beautiful !!}
if (def_from.deftype=filedef) then
begin
if (tfiledef(def_from).filetyp=tfiledef(def_to).filetyp) then
begin
if
(
(tfiledef(def_from).typedfiletype.def=nil) and
(tfiledef(def_to).typedfiletype.def=nil)
) or
(
(tfiledef(def_from).typedfiletype.def<>nil) and
(tfiledef(def_to).typedfiletype.def<>nil) and
equal_defs(tfiledef(def_from).typedfiletype.def,tfiledef(def_to).typedfiletype.def)
) or
(
(tfiledef(def_from).filetyp = ft_typed) and
(tfiledef(def_to).filetyp = ft_typed) and
(
(tfiledef(def_from).typedfiletype.def = tdef(voidtype.def)) or
(tfiledef(def_to).typedfiletype.def = tdef(voidtype.def))
)
) then
begin
eq:=te_equal;
end;
end
else
if ((tfiledef(def_from).filetyp = ft_untyped) and
(tfiledef(def_to).filetyp = ft_typed)) or
((tfiledef(def_from).filetyp = ft_typed) and
(tfiledef(def_to).filetyp = ft_untyped)) then
begin
doconv:=tc_equal;
eq:=te_convert_l1;
end;
end;
end;
recorddef :
begin
{ interface -> guid }
if is_interface(def_from) and
(def_to=rec_tguid) then
begin
doconv:=tc_intf_2_guid;
eq:=te_convert_l1;
end;
end;
formaldef :
begin
doconv:=tc_equal;
if (def_from.deftype=formaldef) then
eq:=te_equal
else
{ Just about everything can be converted to a formaldef...}
if not (def_from.deftype in [abstractdef,errordef]) then
eq:=te_convert_l1;
end;
end;
{ if we didn't find an appropriate type conversion yet and
there is a variant involved then we search also the := operator }
if (eq=te_incompatible) and
check_operator and
((def_from.deftype in [objectdef,recorddef,arraydef,stringdef,variantdef]) or
(def_to.deftype in [objectdef,recorddef,arraydef,stringdef,variantdef])) then
begin
operatorpd:=assignment_overloaded(def_from,def_to);
if assigned(operatorpd) then
eq:=te_convert_operator;
end;
{ update convtype for te_equal when it is not yet set }
if (eq=te_equal) and
(doconv=tc_not_possible) then
doconv:=tc_equal;
compare_defs_ext:=eq;
end;
function equal_defs(def_from,def_to:tdef):boolean;
var
convtyp : tconverttype;
pd : tprocdef;
begin
{ Compare defs with nothingn and no explicit typecasts and
searching for overloaded operators is not needed }
equal_defs:=(compare_defs_ext(def_from,def_to,nothingn,false,false,convtyp,pd)>=te_equal);
end;
function compare_defs(def_from,def_to:tdef;fromtreetype:tnodetype):tequaltype;
var
doconv : tconverttype;
pd : tprocdef;
begin
compare_defs:=compare_defs_ext(def_from,def_to,fromtreetype,false,true,doconv,pd);
end;
function is_subequal(def1, def2: tdef): boolean;
var
basedef1,basedef2 : tenumdef;
Begin
is_subequal := false;
if assigned(def1) and assigned(def2) then
Begin
if (def1.deftype = orddef) and (def2.deftype = orddef) then
Begin
{ see p.47 of Turbo Pascal 7.01 manual for the separation of types }
{ range checking for case statements is done with testrange }
case torddef(def1).typ of
u8bit,u16bit,u32bit,u64bit,
s8bit,s16bit,s32bit,s64bit :
is_subequal:=(torddef(def2).typ in [s64bit,u64bit,s32bit,u32bit,u8bit,s8bit,s16bit,u16bit]);
bool8bit,bool16bit,bool32bit :
is_subequal:=(torddef(def2).typ in [bool8bit,bool16bit,bool32bit]);
uchar :
is_subequal:=(torddef(def2).typ=uchar);
uwidechar :
is_subequal:=(torddef(def2).typ=uwidechar);
end;
end
else
Begin
{ Check if both basedefs are equal }
if (def1.deftype=enumdef) and (def2.deftype=enumdef) then
Begin
{ get both basedefs }
basedef1:=tenumdef(def1);
while assigned(basedef1.basedef) do
basedef1:=basedef1.basedef;
basedef2:=tenumdef(def2);
while assigned(basedef2.basedef) do
basedef2:=basedef2.basedef;
is_subequal:=(basedef1=basedef2);
end;
end;
end;
end;
function compare_paras(paralist1,paralist2 : TLinkedList; acp : compare_type;allowdefaults:boolean):tequaltype;
var
def1,def2 : TParaItem;
eq,lowesteq : tequaltype;
hpd : tprocdef;
convtype : tconverttype;
begin
compare_paras:=te_incompatible;
{ we need to parse the list from left-right so the
not-default parameters are checked first }
lowesteq:=high(tequaltype);
def1:=TParaItem(paralist1.last);
def2:=TParaItem(paralist2.last);
while (assigned(def1)) and (assigned(def2)) do
begin
eq:=te_incompatible;
if (df_unique in def1.paratype.def.defoptions) or (df_unique in def2.paratype.def.defoptions) then
exit;
case acp of
cp_value_equal_const :
begin
if (
(def1.paratyp<>def2.paratyp) and
((def1.paratyp in [vs_var,vs_out]) or
(def2.paratyp in [vs_var,vs_out]))
) then
exit;
eq:=compare_defs(def1.paratype.def,def2.paratype.def,nothingn);
end;
cp_all :
begin
if (def1.paratyp<>def2.paratyp) then
exit;
eq:=compare_defs(def1.paratype.def,def2.paratype.def,nothingn);
end;
cp_procvar :
begin
if (def1.paratyp<>def2.paratyp) then
exit;
eq:=compare_defs_ext(def1.paratype.def,def2.paratype.def,nothingn,
false,true,convtype,hpd);
if (eq>te_incompatible) and
(eq<te_equal) and
not(
(convtype in [tc_equal,tc_int_2_int]) and
(def1.paratype.def.size=def2.paratype.def.size)
) then
begin
eq:=te_incompatible;
end;
end;
else
eq:=compare_defs(def1.paratype.def,def2.paratype.def,nothingn);
end;
{ check type }
if eq=te_incompatible then
exit;
if eq<lowesteq then
lowesteq:=eq;
{ also check default value if both have it declared }
if assigned(def1.defaultvalue) and
assigned(def2.defaultvalue) then
begin
if not equal_constsym(tconstsym(def1.defaultvalue),tconstsym(def2.defaultvalue)) then
exit;
end;
def1:=TParaItem(def1.previous);
def2:=TParaItem(def2.previous);
end;
{ when both lists are empty then the parameters are equal. Also
when one list is empty and the other has a parameter with default
value assigned then the parameters are also equal }
if ((def1=nil) and (def2=nil)) or
(allowdefaults and
((assigned(def1) and assigned(def1.defaultvalue)) or
(assigned(def2) and assigned(def2.defaultvalue)))) then
compare_paras:=lowesteq;
end;
function proc_to_procvar_equal(def1:tabstractprocdef;def2:tprocvardef):tequaltype;
var
ismethod : boolean;
eq : tequaltype;
po_comp : tprocoptions;
begin
proc_to_procvar_equal:=te_incompatible;
if not(assigned(def1)) or not(assigned(def2)) then
exit;
{ check for method pointer }
if def1.deftype=procvardef then
begin
ismethod:=(po_methodpointer in def1.procoptions);
end
else
begin
ismethod:=assigned(def1.owner) and
(def1.owner.symtabletype=objectsymtable);
end;
if (ismethod and not (po_methodpointer in def2.procoptions)) or
(not(ismethod) and (po_methodpointer in def2.procoptions)) then
begin
Message(type_e_no_method_and_procedure_not_compatible);
exit;
end;
{ check return value and options, methodpointer is already checked }
po_comp:=po_compatibility_options-[po_methodpointer];
if (m_delphi in aktmodeswitches) then
exclude(po_comp,po_varargs);
if ((po_comp * def1.procoptions)= (po_comp * def2.procoptions)) and
equal_defs(def1.rettype.def,def2.rettype.def) and
(def1.para_size(target_info.alignment.paraalign)=def2.para_size(target_info.alignment.paraalign)) then
begin
{ return equal type based on the parameters, but a proc->procvar
is never exact, so map an exact match of the parameters to
te_equal }
eq:=compare_paras(def1.para,def2.para,cp_procvar,false);
if eq=te_exact then
eq:=te_equal;
proc_to_procvar_equal:=eq;
end;
end;
function is_equal(def1,def2 : tdef) : boolean;
var
doconv : tconverttype;
hpd : tprocdef;
begin
is_equal:=(compare_defs_ext(def1,def2,nothingn,false,true,doconv,hpd)>=te_equal);
end;
function equal_paras(paralist1,paralist2 : TLinkedList; acp : compare_type;allowdefaults:boolean) : boolean;
begin
equal_paras:=(compare_paras(paralist1,paralist2,acp,allowdefaults)>=te_equal);
end;
end.
{
$Log$
Revision 1.17 2003-01-09 21:43:39 peter
* constant string conversion fixed, it's now equal to both
shortstring, ansistring and the typeconvnode will return
te_equal but still return convtype to change the constnode
Revision 1.16 2003/01/05 22:42:13 peter
* use int_to_int conversion for pointer/procvar/classref to int
Revision 1.15 2003/01/05 15:54:15 florian
+ added proper support of type = type <type>; for simple types
Revision 1.14 2003/01/03 17:16:04 peter
* fixed assignment operator checking for typecast
Revision 1.13 2002/12/29 18:15:19 peter
* varargs is not checked in proc->procvar for delphi
Revision 1.12 2002/12/29 14:57:50 peter
* unit loading changed to first register units and load them
afterwards. This is needed to support uses xxx in yyy correctly
* unit dependency check fixed
Revision 1.11 2002/12/27 15:26:12 peter
* procvar compare with 2 ints did not check the integer size
Revision 1.10 2002/12/23 22:22:16 peter
* don't allow implicit bool->int conversion
Revision 1.9 2002/12/18 21:37:36 peter
* allow classref-classref always when explicit
Revision 1.8 2002/12/15 22:37:53 peter
* give conversions from pointer to pwidechar a penalty (=prefer pchar)
Revision 1.7 2002/12/11 22:40:12 peter
* proc->procvar is never an exact match, convert exact parameters
to equal for the whole proc to procvar conversion level
Revision 1.6 2002/12/06 17:49:44 peter
* prefer string-shortstring over other string-string conversions
Revision 1.5 2002/12/05 14:27:26 florian
* some variant <-> dyn. array stuff
Revision 1.4 2002/12/01 22:07:41 carl
* warning of portabilitiy problems with parasize / localsize
+ some added documentation
Revision 1.3 2002/11/27 15:33:46 peter
* the never ending story of tp procvar hacks
Revision 1.2 2002/11/27 02:32:14 peter
* fix cp_procvar compare
Revision 1.1 2002/11/25 17:43:16 peter
* splitted defbase in defutil,symutil,defcmp
* merged isconvertable and is_equal into compare_defs(_ext)
* made operator search faster by walking the list only once
}
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