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719 lines
26 KiB
ObjectPascal
719 lines
26 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1996-98 by Florian Klaempfl
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This unit exports some help routines for the type checking
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit htypechk;
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interface
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uses
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tree,symtable;
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const
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{ firstcallparan without varspez we don't count the ref }
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count_ref : boolean = true;
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get_para_resulttype : boolean = false;
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allow_array_constructor : boolean = false;
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{ Conversion }
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function isconvertable(def_from,def_to : pdef;
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var doconv : tconverttype;fromtreetype : ttreetyp;
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explicit : boolean) : byte;
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{ Register Allocation }
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procedure make_not_regable(p : ptree);
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procedure left_right_max(p : ptree);
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procedure calcregisters(p : ptree;r32,fpu,mmx : word);
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{ subroutine handling }
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procedure test_protected_sym(sym : psym);
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procedure test_protected(p : ptree);
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function is_procsym_load(p:Ptree):boolean;
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function is_procsym_call(p:Ptree):boolean;
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function is_assignment_overloaded(from_def,to_def : pdef) : boolean;
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implementation
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uses
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globtype,systems,tokens,
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cobjects,verbose,globals,
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types,
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hcodegen;
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{****************************************************************************
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Convert
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****************************************************************************}
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{ Returns:
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0 - Not convertable
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1 - Convertable
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2 - Convertable, but not first choice }
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function isconvertable(def_from,def_to : pdef;
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var doconv : tconverttype;fromtreetype : ttreetyp;
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explicit : boolean) : byte;
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{ Tbasetype: uauto,uvoid,uchar,
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u8bit,u16bit,u32bit,
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s8bit,s16bit,s32,
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bool8bit,bool16bit,bool32bit,
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u64bit,s64bitint }
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type
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tbasedef=(bvoid,bchar,bint,bbool);
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const
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basedeftbl:array[tbasetype] of tbasedef =
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(bvoid,bvoid,bchar,
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bint,bint,bint,
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bint,bint,bint,
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bbool,bbool,bbool,bint,bint);
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basedefconverts : array[tbasedef,tbasedef] of tconverttype =
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((tc_not_possible,tc_not_possible,tc_not_possible,tc_not_possible),
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(tc_not_possible,tc_equal,tc_not_possible,tc_not_possible),
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(tc_not_possible,tc_not_possible,tc_int_2_int,tc_int_2_bool),
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(tc_not_possible,tc_not_possible,tc_bool_2_int,tc_bool_2_bool));
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var
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b : byte;
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hd1,hd2 : pdef;
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begin
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{ safety check }
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if not(assigned(def_from) and assigned(def_to)) then
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begin
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isconvertable:=0;
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exit;
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end;
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b:=0;
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{ we walk the wanted (def_to) types and check then the def_from
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types if there is a conversion possible }
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case def_to^.deftype of
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orddef :
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begin
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case def_from^.deftype of
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orddef :
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begin
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doconv:=basedefconverts[basedeftbl[porddef(def_from)^.typ],basedeftbl[porddef(def_to)^.typ]];
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b:=1;
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if (doconv=tc_not_possible) or
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((doconv=tc_int_2_bool) and
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(not explicit) and
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(not is_boolean(def_from))) or
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((doconv=tc_bool_2_int) and
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(not explicit) and
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(not is_boolean(def_to))) then
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b:=0;
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end;
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enumdef :
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begin
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doconv:=tc_int_2_int;
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b:=1;
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end;
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end;
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end;
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stringdef :
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begin
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case def_from^.deftype of
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stringdef : begin
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doconv:=tc_string_2_string;
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b:=1;
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end;
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orddef : begin
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{ char to string}
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if is_char(def_from) then
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begin
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doconv:=tc_char_2_string;
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b:=1;
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end;
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end;
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arraydef : begin
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{ string to array of char, the length check is done by the firstpass of this node }
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if is_equal(parraydef(def_from)^.definition,cchardef) then
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begin
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doconv:=tc_chararray_2_string;
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if (not(cs_ansistrings in aktlocalswitches) and
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is_shortstring(def_to)) or
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((cs_ansistrings in aktlocalswitches) and
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is_ansistring(def_to)) then
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b:=1
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else
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b:=2;
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end;
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end;
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pointerdef : begin
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{ pchar can be assigned to short/ansistrings }
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if is_pchar(def_from) and not(m_tp in aktmodeswitches) then
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begin
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doconv:=tc_pchar_2_string;
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b:=1;
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end;
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end;
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end;
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end;
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floatdef :
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begin
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case def_from^.deftype of
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orddef : begin { ordinal to real }
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if is_integer(def_from) then
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begin
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if pfloatdef(def_to)^.typ=f32bit then
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doconv:=tc_int_2_fix
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else
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doconv:=tc_int_2_real;
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b:=1;
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end;
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end;
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floatdef : begin { 2 float types ? }
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if pfloatdef(def_from)^.typ=pfloatdef(def_to)^.typ then
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doconv:=tc_equal
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else
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begin
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if pfloatdef(def_from)^.typ=f32bit then
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doconv:=tc_fix_2_real
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else
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if pfloatdef(def_to)^.typ=f32bit then
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doconv:=tc_real_2_fix
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else
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doconv:=tc_real_2_real;
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end;
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b:=1;
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end;
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end;
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end;
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enumdef :
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begin
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if (def_from^.deftype=enumdef) then
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begin
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if assigned(penumdef(def_from)^.basedef) then
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hd1:=penumdef(def_from)^.basedef
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else
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hd1:=def_from;
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if assigned(penumdef(def_to)^.basedef) then
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hd2:=penumdef(def_to)^.basedef
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else
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hd2:=def_to;
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if (hd1=hd2) then
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b:=1;
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end;
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end;
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arraydef :
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begin
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{ open array is also compatible with a single element of its base type }
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if is_open_array(def_to) and
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is_equal(parraydef(def_to)^.definition,def_from) then
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begin
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doconv:=tc_equal;
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b:=1;
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end
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else
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begin
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case def_from^.deftype of
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pointerdef : begin
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if (parraydef(def_to)^.lowrange=0) and
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is_equal(ppointerdef(def_from)^.definition,parraydef(def_to)^.definition) then
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begin
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doconv:=tc_pointer_2_array;
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b:=1;
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end;
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end;
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stringdef : begin
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{ array of char to string }
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if is_equal(parraydef(def_to)^.definition,cchardef) then
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begin
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doconv:=tc_string_2_chararray;
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b:=1;
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end;
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end;
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end;
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end;
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end;
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pointerdef :
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begin
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case def_from^.deftype of
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stringdef : begin
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{ string constant to zero terminated string constant }
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if (fromtreetype=stringconstn) and
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is_pchar(def_to) then
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begin
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doconv:=tc_cstring_2_pchar;
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b:=1;
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end;
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end;
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orddef : begin
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{ char constant to zero terminated string constant }
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if (fromtreetype=ordconstn) and is_equal(def_from,cchardef) and
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is_pchar(def_to) then
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begin
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doconv:=tc_cchar_2_pchar;
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b:=1;
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end;
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end;
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arraydef : begin
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{ chararray to pointer }
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if (parraydef(def_from)^.lowrange=0) and
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is_equal(parraydef(def_from)^.definition,ppointerdef(def_to)^.definition) then
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begin
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doconv:=tc_array_2_pointer;
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b:=1;
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end;
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end;
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pointerdef : begin
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{ child class pointer can be assigned to anchestor pointers }
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if (
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(ppointerdef(def_from)^.definition^.deftype=objectdef) and
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(ppointerdef(def_to)^.definition^.deftype=objectdef) and
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pobjectdef(ppointerdef(def_from)^.definition)^.isrelated(
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pobjectdef(ppointerdef(def_to)^.definition))
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) or
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{ all pointers can be assigned to void-pointer }
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is_equal(ppointerdef(def_to)^.definition,voiddef) or
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{ in my opnion, is this not clean pascal }
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{ well, but it's handy to use, it isn't ? (FK) }
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is_equal(ppointerdef(def_from)^.definition,voiddef) then
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begin
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doconv:=tc_equal;
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b:=1;
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end;
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end;
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procvardef : begin
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{ procedure variable can be assigned to an void pointer }
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{ Not anymore. Use the @ operator now.}
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if not(m_tp_procvar in aktmodeswitches) and
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(ppointerdef(def_to)^.definition^.deftype=orddef) and
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(porddef(ppointerdef(def_to)^.definition)^.typ=uvoid) then
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begin
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doconv:=tc_equal;
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b:=1;
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end;
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end;
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classrefdef,
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objectdef : begin
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{ class types and class reference type
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can be assigned to void pointers }
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if (
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((def_from^.deftype=objectdef) and pobjectdef(def_from)^.isclass) or
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(def_from^.deftype=classrefdef)
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) and
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(ppointerdef(def_to)^.definition^.deftype=orddef) and
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(porddef(ppointerdef(def_to)^.definition)^.typ=uvoid) then
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begin
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doconv:=tc_equal;
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b:=1;
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end;
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end;
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end;
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end;
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setdef :
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begin
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{ automatic arrayconstructor -> set conversion }
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if (def_from^.deftype=arraydef) and (parraydef(def_from)^.IsConstructor) then
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begin
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doconv:=tc_arrayconstructor_2_set;
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b:=1;
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end;
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end;
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procvardef :
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begin
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{ proc -> procvar }
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if (def_from^.deftype=procdef) then
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begin
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def_from^.deftype:=procvardef;
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doconv:=tc_proc_2_procvar;
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if is_equal(def_from,def_to) then
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b:=1;
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def_from^.deftype:=procdef;
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end
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else
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{ for example delphi allows the assignement from pointers }
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{ to procedure variables }
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if (m_pointer_2_procedure in aktmodeswitches) and
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(def_from^.deftype=pointerdef) and
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(ppointerdef(def_from)^.definition^.deftype=orddef) and
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(porddef(ppointerdef(def_from)^.definition)^.typ=uvoid) then
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begin
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doconv:=tc_equal;
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b:=1;
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end
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else
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{ nil is compatible with procvars }
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if (fromtreetype=niln) then
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begin
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doconv:=tc_equal;
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b:=1;
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end;
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end;
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objectdef :
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begin
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{ object pascal objects }
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if (def_from^.deftype=objectdef) {and
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pobjectdef(def_from)^.isclass and pobjectdef(def_to)^.isclass }then
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begin
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doconv:=tc_equal;
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if pobjectdef(def_from)^.isrelated(pobjectdef(def_to)) then
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b:=1;
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end
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else
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{ nil is compatible with class instances }
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if (fromtreetype=niln) and (pobjectdef(def_to)^.isclass) then
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begin
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doconv:=tc_equal;
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b:=1;
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end;
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end;
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classrefdef :
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begin
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{ class reference types }
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if (def_from^.deftype=classrefdef) then
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begin
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doconv:=tc_equal;
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if pobjectdef(pclassrefdef(def_from)^.definition)^.isrelated(
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pobjectdef(pclassrefdef(def_to)^.definition)) then
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b:=1;
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end
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else
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{ nil is compatible with class references }
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if (fromtreetype=niln) then
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begin
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doconv:=tc_equal;
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b:=1;
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end;
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end;
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filedef :
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begin
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{ typed files are all equal to the abstract file type
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name TYPEDFILE in system.pp in is_equal in types.pas
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the problem is that it sholud be also compatible to FILE
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but this would leed to a problem for ASSIGN RESET and REWRITE
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when trying to find the good overloaded function !!
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so all file function are doubled in system.pp
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this is not very beautiful !!}
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if (def_from^.deftype=filedef) and
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(
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(
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(pfiledef(def_from)^.filetype = ft_typed) and
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(pfiledef(def_to)^.filetype = ft_typed) and
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(
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(pfiledef(def_from)^.typed_as = pdef(voiddef)) or
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(pfiledef(def_to)^.typed_as = pdef(voiddef))
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)
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) or
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(
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(
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(pfiledef(def_from)^.filetype = ft_untyped) and
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(pfiledef(def_to)^.filetype = ft_typed)
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) or
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(
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(pfiledef(def_from)^.filetype = ft_typed) and
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(pfiledef(def_to)^.filetype = ft_untyped)
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)
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)
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) then
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begin
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doconv:=tc_equal;
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b:=1;
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end
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end;
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else
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begin
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{ assignment overwritten ?? }
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if is_assignment_overloaded(def_from,def_to) then
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b:=1;
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end;
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end;
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{ nil is compatible with ansi- and wide strings }
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{ no, that isn't true, (FK)
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if (fromtreetype=niln) and (def_to^.deftype=stringdef)
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and (pstringdef(def_to)^.string_typ in [st_ansistring,st_widestring]) then
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begin
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doconv:=tc_equal;
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b:=1;
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end
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else
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}
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{ ansi- and wide strings can be assigned to void pointers }
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{ no, (FK)
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if (def_from^.deftype=stringdef) and
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(pstringdef(def_from)^.string_typ in [st_ansistring,st_widestring]) and
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(def_to^.deftype=pointerdef) and
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(ppointerdef(def_to)^.definition^.deftype=orddef) and
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(porddef(ppointerdef(def_to)^.definition)^.typ=uvoid) then
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begin
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doconv:=tc_equal;
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b:=1;
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end
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else
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}
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{ ansistrings can be assigned to pchar
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this needs an explicit type cast (FK)
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if is_ansistring(def_from) and
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(def_to^.deftype=pointerdef) and
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(ppointerdef(def_to)^.definition^.deftype=orddef) and
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(porddef(ppointerdef(def_to)^.definition)^.typ=uchar) then
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begin
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doconv:=tc_ansistring_2_pchar;
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b:=1;
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end
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else
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}
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isconvertable:=b;
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end;
|
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|
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{****************************************************************************
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Register Calculation
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****************************************************************************}
|
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|
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{ marks an lvalue as "unregable" }
|
|
procedure make_not_regable(p : ptree);
|
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begin
|
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case p^.treetype of
|
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typeconvn :
|
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make_not_regable(p^.left);
|
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loadn :
|
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if p^.symtableentry^.typ=varsym then
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pvarsym(p^.symtableentry)^.var_options :=
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pvarsym(p^.symtableentry)^.var_options and not vo_regable;
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end;
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end;
|
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|
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|
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procedure left_right_max(p : ptree);
|
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begin
|
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if assigned(p^.left) then
|
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begin
|
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if assigned(p^.right) then
|
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begin
|
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p^.registers32:=max(p^.left^.registers32,p^.right^.registers32);
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p^.registersfpu:=max(p^.left^.registersfpu,p^.right^.registersfpu);
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{$ifdef SUPPORT_MMX}
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p^.registersmmx:=max(p^.left^.registersmmx,p^.right^.registersmmx);
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{$endif SUPPORT_MMX}
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end
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else
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begin
|
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p^.registers32:=p^.left^.registers32;
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p^.registersfpu:=p^.left^.registersfpu;
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{$ifdef SUPPORT_MMX}
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p^.registersmmx:=p^.left^.registersmmx;
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{$endif SUPPORT_MMX}
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end;
|
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end;
|
|
end;
|
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|
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{ calculates the needed registers for a binary operator }
|
|
procedure calcregisters(p : ptree;r32,fpu,mmx : word);
|
|
|
|
begin
|
|
left_right_max(p);
|
|
|
|
{ Only when the difference between the left and right registers < the
|
|
wanted registers allocate the amount of registers }
|
|
|
|
if assigned(p^.left) then
|
|
begin
|
|
if assigned(p^.right) then
|
|
begin
|
|
if (abs(p^.left^.registers32-p^.right^.registers32)<r32) then
|
|
inc(p^.registers32,r32);
|
|
if (abs(p^.left^.registersfpu-p^.right^.registersfpu)<fpu) then
|
|
inc(p^.registersfpu,fpu);
|
|
{$ifdef SUPPORT_MMX}
|
|
if (abs(p^.left^.registersmmx-p^.right^.registersmmx)<mmx) then
|
|
inc(p^.registersmmx,mmx);
|
|
{$endif SUPPORT_MMX}
|
|
end
|
|
else
|
|
begin
|
|
if (p^.left^.registers32<r32) then
|
|
inc(p^.registers32,r32);
|
|
if (p^.left^.registersfpu<fpu) then
|
|
inc(p^.registersfpu,fpu);
|
|
{$ifdef SUPPORT_MMX}
|
|
if (p^.left^.registersmmx<mmx) then
|
|
inc(p^.registersmmx,mmx);
|
|
{$endif SUPPORT_MMX}
|
|
end;
|
|
end;
|
|
|
|
{ error CGMessage, if more than 8 floating point }
|
|
{ registers are needed }
|
|
if p^.registersfpu>8 then
|
|
CGMessage(cg_e_too_complex_expr);
|
|
end;
|
|
|
|
{****************************************************************************
|
|
Subroutine Handling
|
|
****************************************************************************}
|
|
|
|
{ protected field handling
|
|
protected field can not appear in
|
|
var parameters of function !!
|
|
this can only be done after we have determined the
|
|
overloaded function
|
|
this is the reason why it is not in the parser, PM }
|
|
|
|
procedure test_protected_sym(sym : psym);
|
|
begin
|
|
if ((sym^.properties and sp_protected)<>0) and
|
|
((sym^.owner^.symtabletype=unitsymtable) or
|
|
((sym^.owner^.symtabletype=objectsymtable) and
|
|
(pobjectdef(sym^.owner^.defowner)^.owner^.symtabletype=unitsymtable))) then
|
|
CGMessage(parser_e_cant_access_protected_member);
|
|
end;
|
|
|
|
|
|
procedure test_protected(p : ptree);
|
|
begin
|
|
case p^.treetype of
|
|
loadn : test_protected_sym(p^.symtableentry);
|
|
typeconvn : test_protected(p^.left);
|
|
derefn : test_protected(p^.left);
|
|
subscriptn : begin
|
|
{ test_protected(p^.left);
|
|
Is a field of a protected var
|
|
also protected ??? PM }
|
|
test_protected_sym(p^.vs);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function is_procsym_load(p:Ptree):boolean;
|
|
begin
|
|
is_procsym_load:=((p^.treetype=loadn) and (p^.symtableentry^.typ=procsym)) or
|
|
((p^.treetype=addrn) and (p^.left^.treetype=loadn)
|
|
and (p^.left^.symtableentry^.typ=procsym)) ;
|
|
end;
|
|
|
|
{ change a proc call to a procload for assignment to a procvar }
|
|
{ this can only happen for proc/function without arguments }
|
|
function is_procsym_call(p:Ptree):boolean;
|
|
begin
|
|
is_procsym_call:=(p^.treetype=calln) and (p^.left=nil) and
|
|
(((p^.symtableprocentry^.typ=procsym) and (p^.right=nil)) or
|
|
((p^.right<>nil) and (p^.right^.symtableprocentry^.typ=varsym)));
|
|
end;
|
|
|
|
|
|
function is_assignment_overloaded(from_def,to_def : pdef) : boolean;
|
|
var
|
|
passproc : pprocdef;
|
|
convtyp : tconverttype;
|
|
begin
|
|
is_assignment_overloaded:=false;
|
|
if assigned(overloaded_operators[assignment]) then
|
|
passproc:=overloaded_operators[assignment]^.definition
|
|
else
|
|
exit;
|
|
while passproc<>nil do
|
|
begin
|
|
if is_equal(passproc^.retdef,to_def) and
|
|
(isconvertable(from_def,passproc^.para1^.data,convtyp,ordconstn,false)=1) then
|
|
begin
|
|
is_assignment_overloaded:=true;
|
|
break;
|
|
end;
|
|
passproc:=passproc^.nextoverloaded;
|
|
end;
|
|
end;
|
|
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.20 1999-04-15 08:56:27 peter
|
|
* fixed bool-bool conversion
|
|
|
|
Revision 1.19 1999/03/24 23:17:02 peter
|
|
* fixed bugs 212,222,225,227,229,231,233
|
|
|
|
Revision 1.18 1999/03/06 17:25:19 peter
|
|
* moved comp<->real warning so it doesn't occure everytime that
|
|
isconvertable is called with
|
|
|
|
Revision 1.17 1999/03/02 18:24:20 peter
|
|
* fixed overloading of array of char
|
|
|
|
Revision 1.16 1999/01/27 13:53:27 pierre
|
|
htypechk.pas
|
|
|
|
Revision 1.15 1999/01/27 13:12:10 pierre
|
|
* bool to int must be explicit
|
|
|
|
Revision 1.14 1999/01/19 15:55:32 pierre
|
|
* fix for boolean to comp conversion (now disabled)
|
|
|
|
Revision 1.13 1998/12/15 17:11:37 peter
|
|
* string:=pchar not allowed in tp mode
|
|
|
|
Revision 1.12 1998/12/11 00:03:18 peter
|
|
+ globtype,tokens,version unit splitted from globals
|
|
|
|
Revision 1.11 1998/12/10 09:47:21 florian
|
|
+ basic operations with int64/qord (compiler with -dint64)
|
|
+ rtti of enumerations extended: names are now written
|
|
|
|
Revision 1.10 1998/11/29 12:40:23 peter
|
|
* newcnv -> not oldcnv
|
|
|
|
Revision 1.9 1998/11/26 13:10:42 peter
|
|
* new int - int conversion -dNEWCNV
|
|
* some function renamings
|
|
|
|
Revision 1.8 1998/11/17 00:36:42 peter
|
|
* more ansistring fixes
|
|
|
|
Revision 1.7 1998/10/14 13:33:24 peter
|
|
* fixed small typo
|
|
|
|
Revision 1.6 1998/10/14 12:53:38 peter
|
|
* fixed small tp7 things
|
|
* boolean:=longbool and longbool fixed
|
|
|
|
Revision 1.5 1998/10/12 09:49:58 florian
|
|
+ support of <procedure var type>:=<pointer> in delphi mode added
|
|
|
|
Revision 1.4 1998/09/30 16:42:52 peter
|
|
* fixed bool-bool cnv
|
|
|
|
Revision 1.3 1998/09/24 23:49:05 peter
|
|
+ aktmodeswitches
|
|
|
|
Revision 1.2 1998/09/24 09:02:14 peter
|
|
* rewritten isconvertable to use case
|
|
* array of .. and single variable are compatible
|
|
|
|
Revision 1.1 1998/09/23 20:42:22 peter
|
|
* splitted pass_1
|
|
|
|
}
|